FN Thomson Reuters Web of Science™ VR 1.0 PT J AU STEPHENS, JR BLANCO, A BUSSOLETTI, E COLANGELI, L FONTI, S MENNELLA, V OROFINO, V AF STEPHENS, JR BLANCO, A BUSSOLETTI, E COLANGELI, L FONTI, S MENNELLA, V OROFINO, V TI EFFECT OF COMPOSITION ON IR-SPECTRA OF SYNTHETIC AMORPHOUS SILICATE COSMIC DUST ANALOGS SO PLANETARY AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT Conference on Dust, Molecules and Background - From Laboratory to Space CY 1994 CL CAPRI, ITALY SP Italian Soc Phys, Italian Astron Soc ID INFRARED EXTINCTION; OLIVINE AB Synthetic amorphous silicate dust samples were produced with various metal to silicon and iron to magnesium ratios to serve as analogues to cosmic dust. The IR spectra of the dusts were measured in the 10 and 20 mu m bands to determine the effect of composition on these characteristic features. Silicate dusts were produced with only Mg and Fe cations, and also with Mg, Fe, Na, Ca and Al cations in their relative cosmic ratio to study the spectral effects of varying silicate composition. The spectral results are compatible with the condensation of cosmic silicate grains as amorphous grains containing the major metals in their relative cosmic proportions, i.e. without chemical fractionation. C1 UNIV LECCE,DIPARTIMENTO FIS,I-73100 LECCE,ITALY. UNIV NAPLES,IST NAVALE,IST FIS SPERIMENTALE,NAPLES,ITALY. OSSERV ASTRON CAPODIMONTE,I-80131 NAPLES,ITALY. RP STEPHENS, JR (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 23 TC 14 Z9 14 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0032-0633 J9 PLANET SPACE SCI JI Planet Space Sci. PD OCT-NOV PY 1995 VL 43 IS 10-11 BP 1241 EP & DI 10.1016/0032-0633(95)00005-P PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TJ949 UT WOS:A1995TJ94900014 ER PT J AU SMOOT, GF AF SMOOT, GF TI LONG-WAVELENGTH OBSERVATIONS OF HIGH GALACTIC LATITUDE DUST SO PLANETARY AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT Conference on Dust, Molecules and Background - From Laboratory to Space CY 1994 CL CAPRI, ITALY SP Italian Soc Phys, Italian Astron Soc ID AMORPHOUS-CARBON; GRAINS AB The properties of high latitude dust are of great interest to extragalactic astronomers and cosmologists. It is proposed here that essentially all high galactic interstellar dust is at a typical temperature of a bout 20 K (i.e. it is warm dust) and that if any cold interstellar dust exists, its emission at mm wavelengths is less than 5% of that from the primary component of warm dust observed by IRAS. Thus, the IRAS maps reveal the high latitude dust of import. The crucial issue is how the emissivity of the dust scales with wavelength. The mm wavelength emission in this warm dust-only model is consistent with roughly a wavelength-dependent emissivity epsilon(lambda) proportional to lambda(-1.5). Such a dependence has been observed previously in the IR. What is new here is the proposal that this extends to the mm wavelength region. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP SMOOT, GF (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,SPACE SCI LAB,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720, USA. NR 16 TC 2 Z9 2 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0032-0633 J9 PLANET SPACE SCI JI Planet Space Sci. PD OCT-NOV PY 1995 VL 43 IS 10-11 BP 1345 EP & DI 10.1016/0032-0633(95)00043-5 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TJ949 UT WOS:A1995TJ94900030 ER PT J AU SMOOT, GF AF SMOOT, GF TI LARGE ANGULAR SCALE ANISOTROPY OF THE CBR - COBE DMR OBSERVATIONS SO PLANETARY AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT Conference on Dust, Molecules and Background - From Laboratory to Space CY 1994 CL CAPRI, ITALY SP Italian Soc Phys, Italian Astron Soc ID MICROWAVE BACKGROUND-RADIATION; SEARCH; RADIOMETER AB Observations of the Cosmic Microwave Background Radiation (CMBR) have put the standard model of cosmology, the Big Bang, on firm footing and provide tests of various ideas of large scale structure formation and the origin of the universe. Ground-based measurements of the cosmic background radiation are hampered by emission from atmosphere O-2 and H2O molecules. This has forced precision experiments to high altitudes and balloon-borne instrumentation. Ultimately, space has proven to the most reliable venue for these observations. However, the foreground galactic emissions, on particular dust thermal emission as well as emission from energetic electrons, provide a serious limit to observations. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP SMOOT, GF (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,SPACE SCI LAB,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720, USA. NR 42 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0032-0633 J9 PLANET SPACE SCI JI Planet Space Sci. PD OCT-NOV PY 1995 VL 43 IS 10-11 BP 1449 EP & DI 10.1016/0032-0633(95)00042-4 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TJ949 UT WOS:A1995TJ94900044 ER PT J AU MANDOLESI, N BERSANELLI, M CESARSKY, C DANESE, L EFSTATHIOU, G GRIFFIN, M LAMARRE, JM NORGAARDNIELSEN, HU PACE, O PUGET, JL RAISANEN, A SMOOT, GF TAUBER, J VOLONTE, S AF MANDOLESI, N BERSANELLI, M CESARSKY, C DANESE, L EFSTATHIOU, G GRIFFIN, M LAMARRE, JM NORGAARDNIELSEN, HU PACE, O PUGET, JL RAISANEN, A SMOOT, GF TAUBER, J VOLONTE, S TI COBRAS/SAMBA - THE ESA MEDIUM-SIZE MISSION FOR MEASUREMENTS OF CBR ANISOTROPY SO PLANETARY AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT Conference on Dust, Molecules and Background - From Laboratory to Space CY 1994 CL CAPRI, ITALY SP Italian Soc Phys, Italian Astron Soc ID MICROWAVE AB The COBRAS/SAMBA mission is designed for extensive, accurate mapping of the anisotropy of the cosmic Background Radiation, with angular sensitivity from scales of a few arcminutes up to and over-lapping with the > 7 degrees COBE-DMR resolution. This will allow a full identification of the primordial density perturbations which grew to form the large-scale structures observed in the present universe. The COBRAS/SAMBA maps will provide a major source of information relevant to several cosmological and astrophysical issues, such as testing theories of the early universe and the origin of cosmic structure. One of the main diffuse foreground emissions will be from interstellar dust, and the mission will provide relevant information on its components and emission properties. A combination of bolometric and radiometric detection techniques will ensure the sensitivity and wide spectral coverage required for accurate foreground discrimination. A far-Earth orbit has been selected to minimize the unwanted emission from the Earth as a source of contamination. The project is currently undergoing a feasibility study within the European Space Agency M3 programme. C1 CNR,IST FIS COSM,I-20133 MILAN,ITALY. CNR,IST TESRE,I-40126 BOLOGNA,ITALY. CENS,CEA,DSM,DAPNIA,SAP,SACLAY,FRANCE. UNIV PADUA,PADUA,ITALY. UNIV OXFORD,OXFORD,ENGLAND. UNIV LONDON QUEEN MARY & WESTFIELD COLL,LONDON E1 4NS,ENGLAND. INST ASTROPHYS SPATIALE,ORSAY,FRANCE. DANISH SPACE RES INST,DK-2800 LYNGBY,DENMARK. ESA,ESTEC,FUTURE PROJECT STUDY OFF,NOORDWIJK,NETHERLANDS. HELSINKI UNIV TECHNOL,SF-02150 ESPOO,FINLAND. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA. ESA,ESTEC,DEPT SPACE SCI,NOORDWIJK,NETHERLANDS. ESA,HQ,DIRECTORATE SCI PROGRAMMES,PARIS,FRANCE. RI Raisanen, Antti/G-2405-2013 NR 21 TC 11 Z9 11 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0032-0633 J9 PLANET SPACE SCI JI Planet Space Sci. PD OCT-NOV PY 1995 VL 43 IS 10-11 BP 1459 EP 1465 DI 10.1016/0032-0633(95)99285-T PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TJ949 UT WOS:A1995TJ94900045 ER PT J AU BERSANELLI, M BENSADOUN, M DANESE, L DEAMICI, G KOGUT, A LEVIN, S LIMON, M MAINO, D SMOOT, GF WITEBSKY, C AF BERSANELLI, M BENSADOUN, M DANESE, L DEAMICI, G KOGUT, A LEVIN, S LIMON, M MAINO, D SMOOT, GF WITEBSKY, C TI MEASUREMENTS OF THE ATMOSPHERIC EMISSION AND VARIATIONS IN THE 1-90 GHZ RANGE SO PLANETARY AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT Conference on Dust, Molecules and Background - From Laboratory to Space CY 1994 CL CAPRI, ITALY SP Italian Soc Phys, Italian Astron Soc ID COSMIC BACKGROUND-RADIATION; 12 CENTIMETER WAVELENGTH; SCALE MEASUREMENT; SOUTH-POLE; 7.5 GHZ; TEMPERATURE; FREQUENCY AB Ground-based measurements of the Cosmic Background Radiation (CBR) are hampered by emission from atmospheric O-2 and water molecules. We performed multifrequency measurements of the atmospheric emission in the 1-90 GHz spectral range from two high-altitude sites (White Mountain, California, and South Pole, Antarctica). A power spectrum analysis of our data shows variations of the atmospheric antenna temperature which exceed, on time scales of a few hours or more, those expected from radiometer noise and changes in water column density. When combined with real-time measurements of the local profiles of atmospheric pressure, temperature and humidity, our results indicate variations of order 10% of the O-2 emission (both resonant and non-resonant components) on time scales of hours to days, driven by the evolution of the atmospheric pressure profile. These oxygen emission fluctuations appear significantly larger than previously expected, and may affect ground-based CBR experiments. C1 UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. DIPARTIMENTO ASTRON,I-35122 PADUA,ITALY. NASA,GSFC,HUGHES STX,GREENBELT,MD 20771. CALTECH,JET PROP LAB,PASADENA,CA 91109. RP BERSANELLI, M (reprint author), CNR,IST FIS COSM,VIA BASSINI 15,I-20133 MILAN,ITALY. RI Kogut, Alan/D-6293-2012 NR 34 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0032-0633 J9 PLANET SPACE SCI JI Planet Space Sci. PD OCT-NOV PY 1995 VL 43 IS 10-11 BP 1467 EP 1472 DI 10.1016/0032-0633(95)00007-R PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TJ949 UT WOS:A1995TJ94900046 ER PT J AU SHANKLIN, J DEWITT, ND FLANAGAN, JM AF SHANKLIN, J DEWITT, ND FLANAGAN, JM TI THE STROMA OF HIGHER-PLANT PLASTIDS CONTAIN CLPP AND CLPC, FUNCTIONAL HOMOLOGS OF ESCHERICHIA-COLI CLPP AND CLPA - AN ARCHETYPAL 2-COMPONENT ATP-DEPENDENT PROTEASE SO PLANT CELL LA English DT Article ID PEA-CHLOROPLASTS; ARABIDOPSIS-THALIANA; UBIQUITIN; PROTEINS; DEGRADATION; TI; PROTEOLYSIS; SUBUNITS; GENE; RNA AB A cDNA representing the plastid-encoded homolog of the prokaryotic ATP-dependent protease ClpP was amplified by reverse transcription-polymerase chain reaction, cloned, and sequenced. ClpP and a previously isolated cDNA designated ClpC, encoding an ATPase related to proteins encoded by the ClpA/B gene family, were expressed in Escherichia coli. Antibodies directed against these recombinant proteins recognized proteins in a wide variety of organisms. N-terminal analysis of the Clp protein isolated from crude leaf extracts showed that the N-terminal methionine is absent from ClpP and that the transit peptide is cleaved from ClpC. A combination of chloroplast subfractionation and immunolocalization showed that in Arabidopsis, ClpP and ClpC localize to the stroma of the plastid. Immunoblot analyses indicated that ClpP and ClpC are constitutively expressed in all tissues of Arabidopsis at levels equivalent to those of E. coli ClpP and ClpA. ClpP, immunopurified from tobacco extracts, hydrolyzed N-succinyl-Leu-Tyr-amidomethylcoumarin, a substrate of E. coli ClpP. Purified recombinant ClpC facilitated the degradation of H-3-methylcasein by E. coli ClpP in an ATP-dependent fashion. This demonstrates that ClpC is a functional homolog of E. coli ClpA and not of ClpB or ClpX. These data represent the only in vitro demonstration of the activity of a specific ATP-dependent chloroplast protease reported to date. RP SHANKLIN, J (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,BLDG 463,UPTON,NY 11973, USA. NR 53 TC 171 Z9 183 U1 0 U2 6 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 1040-4651 J9 PLANT CELL JI Plant Cell PD OCT PY 1995 VL 7 IS 10 BP 1713 EP 1722 DI 10.1105/tpc.7.10.1713 PG 10 WC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology SC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology GA TB968 UT WOS:A1995TB96800019 PM 7580259 ER PT J AU TRENTMANN, SM KENDE, H AF TRENTMANN, SM KENDE, H TI ANALYSIS OF ARABIDOPSIS CDNA THAT SHOWS HOMOLOGY TO THE TOMATO E8 CDNA SO PLANT MOLECULAR BIOLOGY LA English DT Note DE ARABIDOPSIS THALIANA; AUTOINHIBITION; DIOXYGENASES; ETHYLENE; REVERSE TRANSCRIPTION PCR ID ETHYLENE-FORMING ENZYME; DNA-BINDING FACTOR; FRUIT; GENE; EXPRESSION; YEAST AB The negative regulatory protein of ethylene synthesis in ripening tomato fruit, E8, is structurally related to the enzyme that catalyzes the last step in ethylene synthesis,1-aminocyclopropane-1-carboxylate (ACC) oxidase, and to a large family of 2-oxoglutarate-dependent dioxygenases (2-ODD). A cDNA with structural homology to the tomato E8 was isolated from a cDNA library of Arabidopsis thaliana. Sequence analysis showed that this cDNA, 2A6, encodes a protein of 361 amino acids. Southern blot analysis indicated that the corresponding gene is unique in the Arabidopsis genome. The level of the 2A6 transcript was not increased by ethylene in siliques of Arabidopsis, as was E8 in tomato fruits, and was also expressed in etiolated seedlings, leaves, stems and flowers. The 2A6 protein shows three domains that are highly conserved among E8, ACC oxidases, and 2-ODDs. C1 MICHIGAN STATE UNIV,DOE,PLANT RES LAB,E LANSING,MI 48824. NR 18 TC 9 Z9 13 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0167-4412 J9 PLANT MOL BIOL JI Plant Mol.Biol. PD OCT PY 1995 VL 29 IS 1 BP 161 EP 166 DI 10.1007/BF00019127 PG 6 WC Biochemistry & Molecular Biology; Plant Sciences SC Biochemistry & Molecular Biology; Plant Sciences GA TA034 UT WOS:A1995TA03400014 PM 7579161 ER PT J AU YU, JP SMART, LB JUNG, YS GOLBECK, J MCINTOSH, L AF YU, JP SMART, LB JUNG, YS GOLBECK, J MCINTOSH, L TI ABSENCE OF PSAC SUBUNIT ALLOWS ASSEMBLY OF PHOTOSYSTEM-I CORE BUT PREVENTS THE BINDING OF PSAD AND PSAE IN SYNECHOCYSTIS SP PCC6803 SO PLANT MOLECULAR BIOLOGY LA English DT Article DE CYANOBACTERIA; IRON-SULFUR PROTEIN; PHOTOSYSTEM I; PSAC ID SYNECHOCOCCUS-SP PCC-6301; IRON-SULFUR PROTEIN; SP PCC-6803; INACTIVATION; COMPLEX; GENE; POLYPEPTIDE; IDENTIFICATION; CONSTRUCTION; MUTAGENESIS AB In photosystem I (PSI) of oxygenic photosynthetic organisms the psaC polypeptide, encoded by the psaC gene, provides the ligands for two [4Fe-4S] clusters, F-A and F-B. Unlike other cyanobacteria, two different psaC genes have been reported in the cyanobacterium Synechocystis 6803, one (copy 1) with a deduced amino acid sequence identical to that of tobacco and another (copy 2) with a deduced amino acid sequence similar to those reported for other cyanobacteria. Insertion of a gene encoding kanamycin resistance into copy 2 resulted in a photosynthesis-deficient strain, CDK25, lacking the PsaC, PsaD and PsaE polypeptides in isolated thylakoid membranes, while the PsaA/PsaB and PsaF subunits were found. Growth of the mutant cells was indistinguishable from that of wild-type cells under light-activated heterotrophic growth (LAHG). A reversible P700(+) signal was detected by EPR spectroscopy in the isolated thylakoids during illumination at low temperature. Under these conditions, the EPR signals attributed to F-A and F-B were absent in the mutant strain, but a reversible F-x signal was present with broad resonances at g = 2.079, 1.903, and 1.784. Addition of PsaC and PsaD proteins to the thylakoids gave rise to resonances at g = 2.046, 1.936, 1.922, and 1.880; these values are characteristic of an interaction-type spectrum of F-A(-) and F-B(-). In room-temperature optical spectroscopic analysis, addition of PsaC and PsaD to the thylakoids also restored a 30 ms kinetic transient which is characteristic of the P700(+)[F-A/F-B](-) backreaction. Expression of copy 1 was not detected in cells grown under LAHG and under mixotrophic conditions. These results demonstrate that copy 2 encodes the PsaC polypeptide in PSI in Synechocystis 6803, while copy 1 is not involved in PSI; that the PsaC polypeptide is necessary for stable assembly of PsaD and PsaE into PSI complex in vivo; and that PsaC, PsaD and PsaE are not needed for assembly of PsaA-PsaB dimer and electron transport from P700 to F-x. C1 UNIV NEBRASKA,DEPT BIOCHEM,LINCOLN,NE 68583. RP YU, JP (reprint author), MICHIGAN STATE UNIV,US DOE,PLANT RES LAB,E LANSING,MI 48824, USA. OI Smart, Lawrence/0000-0002-7812-7736 NR 33 TC 45 Z9 54 U1 0 U2 8 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0167-4412 J9 PLANT MOL BIOL JI Plant Mol.Biol. PD OCT PY 1995 VL 29 IS 2 BP 331 EP 342 DI 10.1007/BF00043656 PG 12 WC Biochemistry & Molecular Biology; Plant Sciences SC Biochemistry & Molecular Biology; Plant Sciences GA TC931 UT WOS:A1995TC93100012 PM 7579183 ER PT J AU BERGMAN, RG AF BERGMAN, RG TI SYNTHESIS AND REACTIONS OF MONOMERIC LATE TRANSITION-METAL ALKOXO, ARYLOXO AND HYDROXO COMPLEXES SO POLYHEDRON LA English DT Article ID REDUCTIVE ELIMINATION; INSERTION REACTIONS; EXCHANGE-REACTIONS; MIGRATORY INSERTION; HYDRIDE COMPLEXES; OXYGEN BONDS; O-H; N-H; REACTIVITY; RUTHENIUM AB Despite the fact that they are postulated as intermediates in many metal-catalyzed transformations, well-characterized complexes having bonds between late transition metals and alkoxo groups are not as well known as their alkylmetal analogues. Even fewer examples of monomeric late transition metal hydroxo complexes are available. This article summarizes recent published work from the author's group that has resulted in the synthesis of a number of rhodium, iridium, rhenium, osmium and ruthenium alkoxo:and hydroxo complexes and has allowed investigation of their chemical properties. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP BERGMAN, RG (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 41 TC 93 Z9 94 U1 1 U2 8 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0277-5387 J9 POLYHEDRON JI Polyhedron PD OCT PY 1995 VL 14 IS 22 BP 3227 EP 3237 DI 10.1016/0277-5387(95)85008-2 PG 11 WC Chemistry, Inorganic & Nuclear; Crystallography SC Chemistry; Crystallography GA RW662 UT WOS:A1995RW66200005 ER PT J AU Yoder, BK Richards, WG Sweeney, WE Wilkinson, JE Avener, ED Woychik, RP AF Yoder, BK Richards, WG Sweeney, WE Wilkinson, JE Avener, ED Woychik, RP TI Insertional mutagenesis and molecular analysis of a new gene associated with polycystic kidney disease SO PROCEEDINGS OF THE ASSOCIATION OF AMERICAN PHYSICIANS LA English DT Article ID GROWTH-FACTOR; MOUSE; EXPRESSION; PROTEIN; CPK; MUTATION; LINKAGE; MITOSIS; TRISOMY; MODEL AB We have identified a new insertional mutation in the mouse (TgN737Rpw) that causes a phenotype that closely resembles human autosomal recessive polycystic kidney disease. The renal pathology in these mutants first presents itself as a dilation of the proximal tubules, which is quickly followed by the development of cystic lesions in the collecting ducts. The livers in the mutant animals develop a variable lesion depending upon the genetic background. We have cloned the mutant locus and have isolated and characterized a gene, Tg737, whose expression is disrupted in the mutant animals. Expression of the Tg737 gene can normally be detected using the Northern blot analysis at low levels in a variety of tissues, including the kidney and liver. Using the in situ hybridization procedure, expression of the Tg737 mRNA can be detected in the collecting ducts of adult kidneys and in portions of the embryonic day 15.5 kidney. Most important, we have corrected the defective kidney trait by expressing the wild-type cDNA as a transgene in the mutant animals. The human homologue of the Tg737 gene has also been cloned and mapped to human chromosome 13. C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. CASE WESTERN RESERVE UNIV,DEPT PEDIAT,CLEVELAND,OH 44106. UNIV TENNESSEE,DEPT PATHOBIOL,KNOXVILLE,TN. FU NIDDK NIH HHS [5 RO1 DK44875, 1 RO1 DK45633-01] NR 59 TC 52 Z9 53 U1 0 U2 1 PU BLACKWELL SCIENCE INC PI CAMBRIDGE PA 238 MAIN ST, CAMBRIDGE, MA 02142 SN 1081-650X J9 P ASSOC AM PHYSICIAN JI Proc. Assoc. Am. Phys. PD OCT PY 1995 VL 107 IS 3 BP 314 EP 323 PG 10 WC Medicine, General & Internal; Medicine, Research & Experimental SC General & Internal Medicine; Research & Experimental Medicine GA TL017 UT WOS:A1995TL01700005 PM 8608416 ER PT J AU CHISHOLM, WP AF CHISHOLM, WP TI A REVIEW OF METCS CONTINUOUS PROCESS MONITORING DEVICES FOR APPLICATION TO HIGH-TEMPERATURE AND PRESSURE FOSSIL-FUEL PROCESS STREAMS SO PROCESS CONTROL AND QUALITY LA English DT Article; Proceedings Paper CT 1994 Federation-of-Analytical-Chemistry-and-Spectroscopy-Societies Conference CY OCT 02-07, 1994 CL ST LOUIS, MO SP Federat Anal Chem & Spectroscopy Soc DE MIXED GAS; INDUCTIVELY COUPLED PLASMA; FOSSIL FUELS; PARTICULATES; ONLINE ALKALI MONITORING AB The Morgantown Energy Technology Center (METC) of the United States Department of Energy, in support of advanced fossil fuel technologies, has been developing and applying a number of innovative continuous process monitors. These include an inductively coupled plasma (ICP) spectrometer, an alkali monitor, a particle counter and sizer, and a water vapor monitor. The ICP system uses a helium and argon plasma discharge within a torch assembly capable of accepting a high-temperature and high-pressure sample stream, An artificial neural network is being developed to interpret its data. Real-time data from a bench-scale coal combustor are presented and discussed. The alkali monitor is a flame emission spectrometer currently undergoing field trials. Alkali emission from gasifiers and combustors is of interest because it causes corrosion and deposition on downstream components, such as particle filters, sulfur compound sorbents, turbine blades, etc. This device can measure alkali concentrations at the pares-per-billion level. The particle monitoring devices use laser light scattering to count and size particles. By measuring particle concentration around a particulate removal device, capture efficiency can be measured in real time with a resolution of one minute. Particles between 0.45 and 12 mu m can be counted at rates as high as 500000 per second in 20 bar, 550 degrees C environments. The optical water vapor monitor uses near-infrared light absorption to monitor and control steam injection in an advanced heat exchanger. It is targeted for a 300 degrees C and 5 bar environment. RP CHISHOLM, WP (reprint author), US DOE,MORGANTOWN ENERGY TECHNOL CTR,POB 880,MORGANTOWN,WV 26507, USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0924-3089 J9 PROCESS CONTR QUAL JI Process Control Qual. PD OCT PY 1995 VL 7 IS 2 BP 113 EP 116 PG 4 WC Engineering, Chemical; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA TE270 UT WOS:A1995TE27000008 ER PT J AU SHIH, P HOLLAND, DR KIRSCH, JF AF SHIH, P HOLLAND, DR KIRSCH, JF TI THERMAL-STABILITY DETERMINANTS OF CHICKEN EGG-WHITE LYSOZYME CORE MUTANTS - HYDROPHOBICITY, PACKING VOLUME, AND CONSERVED BURIED WATER-MOLECULES SO PROTEIN SCIENCE LA English DT Article DE BURIED WATER; CHICKEN LYSOZYME; HYDROPHOBICITY; INTERNAL PACKING; SITE-DIRECTED MUTAGENESIS; THERMAL STABILITY; X-RAY STRUCTURE ID CAVITY-CREATING MUTATIONS; PROTEIN STABILITY; THERMODYNAMIC INVESTIGATIONS; ALPHA-LACTALBUMIN; T4 LYSOZYME; ACID; MACROMOLECULES; TRANSTHYRETIN; DEPENDENCE; ENERGETICS AB A series of 24 mutants was made in the buried core of chicken lysozyme at positions 40, 55, and 91. The midpoint temperature of thermal denaturation transition (T-m) values of these core constructs range from 60.9 to 77.3 degrees C, extending an earlier, more limited investigation on thermostability. The T-m values of variants containing conservative replacements for the wild type (WT) (Thr 40-Ile 55-Ser 91) triplet are linearly correlated with hydrophobicity (r = 0.81) and, to a lesser degree, with combined side-chain volume (r = 0.75). The X-ray structures of the S91A (1.9 Angstrom) and I55L/S91T/D101S (1.7 Angstrom) mutants are presented. The former amino acid change is found in duck and mammalian lysozymes, and the latter contains the most thermostable core triplet. A network of four conserved, buried water molecules is associated with the core. It is postulated that these water molecules significantly influence the mutational tolerance at the individual triplet positions. The pH dependence of T-m for the S91D mutant was compared with that of WT enzyme. The pK(a) of S91D is 1.2 units higher in the native than in the denatured state, corresponding to Delta Delta G(298) = 1.7 kcal/mol. This is a low value for charge burial and likely reflects the moderating influence of the buried water molecules or a conformational change. Thermal and chemical denaturation and far UV CD spectroscopy were used to characterize the in vitro properties of I55T. This variant, which buries a hydroxyl group, has similar properties to those of the human amyloidogenic variant I56T. C1 UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. UNIV OREGON,INST MOLEC BIOL,EUGENE,OR 97405. FU NIGMS NIH HHS [GM-07759, GM-08295, GM-20066] NR 69 TC 49 Z9 49 U1 0 U2 5 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD OCT PY 1995 VL 4 IS 10 BP 2050 EP 2062 PG 13 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA RZ766 UT WOS:A1995RZ76600010 PM 8535241 ER PT J AU SHIH, P KIRSCH, JF AF SHIH, P KIRSCH, JF TI DESIGN AND STRUCTURAL-ANALYSIS OF AN ENGINEERED THERMOSTABLE CHICKEN LYSOZYME SO PROTEIN SCIENCE LA English DT Article DE ALPHA-HELIX PROPENSITY; AVIAN LYSOZYME SEQUENCES; CHICKEN LYSOZYME; HUMAN LYSOZYME; INTERIOR PACKING; PROTEIN DESIGN; STRUCTURES; THERMODYNAMIC STABILITY ID EGG-WHITE LYSOZYME; AMINO-ACID-SEQUENCE; X-RAY STRUCTURE; PROTEIN STABILITY; T4 LYSOZYME; DISULFIDE BONDS; ALPHA-HELICES; ACTIVE-SITE; RESOLUTION; MUTATIONS AB A hyperstable (hs) variant of chicken egg-white lysozyme with enhanced thermal (Delta T-m approximate to +10.5 degrees C) and chemical (Delta C-m for guanidine hydrochloride denaturation = +1.3 M) stabilities relative to wild-type (WT) was constructed by combining several individual stabilizing substitutions. The free energy difference between the native and denatured states of the hs variant is 3.1 (GdnHCl, 25 degrees C) to 4.0 (differential scanning calorimetry, 74 degrees C) kcal mol(-1) greater than that of WT. The specific activity of the hs variant is 2.5-fold greater than that of WT. The choice of mutations came from diverse sources: (1) The 155L/S91T core construct with Delta T-m = 3.3 degrees C from WT was available from the accompanying study (Shih P, Holland DR, Kirsch JF, 1995, Protein Sci 4:2050-2062). (2) The A31V mutation was suggested by the better atomic packing in the human lysozyme structure where the Ala 31 equivalent is Leu. (3) The H15L and R114H substitutions were selected on the basis of sequence comparisons with pheasant lysozymes that are more stable than the chicken enzyme. (4) The D101S variant was identified from a screen of mutants previously prepared in this laboratory. The effects of the individual mutations on stability are cumulative and nearly additive. C1 UNIV CALIF BERKELEY, DEPT MOLEC & CELL BIOL, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, CTR ADV MAT, BERKELEY, CA 94720 USA. FU NIGMS NIH HHS [GM-08295-04] NR 60 TC 51 Z9 51 U1 0 U2 4 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0961-8368 EI 1469-896X J9 PROTEIN SCI JI Protein Sci. PD OCT PY 1995 VL 4 IS 10 BP 2063 EP 2072 PG 10 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA RZ766 UT WOS:A1995RZ76600011 PM 8535242 ER PT J AU LAQUA, K SCHRADER, B HOFFMANN, GG MOORE, DS VODINH, T AF LAQUA, K SCHRADER, B HOFFMANN, GG MOORE, DS VODINH, T TI NOMENCLATURE, SYMBOLS, UNITS AND THEIR USAGE IN SPECTROCHEMICAL ANALYSIS .11. DETECTION OF RADIATION (IUPAC RECOMMENDATIONS 1995) SO PURE AND APPLIED CHEMISTRY LA English DT Article AB This report is 11th in the series on Spectrochemical Methods of Analysis issued by IUPAC Commission V.4. It is concerned with Radiation Detection as used in analytical atomic and molecular emission, absorption, and fluorescence spectroscopy in the X-ray and optical wavelength region (i.e. from 10 pm to 1 mm). The present report has five main sections: terms relating to (a)fundamental properties of detectors, (b) thermal detectors,(c) photo-emissive detectors, (d) semiconductor detectors, and (e) spatially resolving detectors. Although still of considerable importance, photographic emulsions are not included. C1 UNIV ESSEN GESAMTHSCH,INST PHYS & THEORET CHEM,D-45117 ESSEN,GERMANY. LOS ALAMOS NATL LAB,DIV CHEM SCI & TECHNOL,LOS ALAMOS,NM 87545. OAK RIDGE NATL LAB,ADV MONITORING DEV GRP,OAK RIDGE,TN 37831. RI Moore, David/C-8692-2013 NR 6 TC 4 Z9 4 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0033-4545 J9 PURE APPL CHEM JI Pure Appl. Chem. PD OCT PY 1995 VL 67 IS 10 BP 1745 EP 1760 DI 10.1351/pac199567101745 PG 16 WC Chemistry, Multidisciplinary SC Chemistry GA TC554 UT WOS:A1995TC55400012 ER PT J AU MOORE, DS URE, TAM BUTLER, LRP AF MOORE, DS URE, TAM BUTLER, LRP TI NOMENCLATURE, SYMBOLS, UNITS AND THEIR USAGE IN SPECTROCHEMICAL ANALYSIS CUMULATIVE INDEX OF TERMS .1.13. SO PURE AND APPLIED CHEMISTRY LA English DT Article C1 UNIV STRATHCLYDE,DEPT PURE & APPL CHEM,GLASGOW G1 1XL,LANARK,SCOTLAND. RP MOORE, DS (reprint author), LOS ALAMOS NATL LAB,DIV CHEM SCI & TECHNOL,POB 1663,LOS ALAMOS,NM 87545, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0033-4545 J9 PURE APPL CHEM JI Pure Appl. Chem. PD OCT PY 1995 VL 67 IS 10 BP 1761 EP 1779 DI 10.1351/pac199567101761 PG 19 WC Chemistry, Multidisciplinary SC Chemistry GA TC554 UT WOS:A1995TC55400013 ER PT J AU MOSES, WW DERENZO, SE WEBER, MJ BLANKESPOOR, SC HO, MH WEST, AC AF MOSES, WW DERENZO, SE WEBER, MJ BLANKESPOOR, SC HO, MH WEST, AC TI SCINTILLATOR CHARACTERIZATION USING THE LBL PULSED X-RAY FACILITY SO RADIATION MEASUREMENTS LA English DT Article AB We have developed a bench-top pulsed X-ray system for measuring scintillation properties of compounds in crystalline or powdered form. The source is a light-excited X-ray tube that produces 40 X-ray photons (mean energy 18.5 keV) per steradian in each 100 ps fwhm pulse. The repetition rate is adjustable from 0 to 10(7) pulses per second. The fluorescent emanations from the X-ray excited samples are detected with either a sapphire-windowed microchannel plate photomultiplier tube (spectral range 150-650 nm, transit time jitter 40 ps fwhm) or a quartz-windowed GaAs(Cs) photomultiplier tube (spectral range 160-930 nm, transit time jitter 4ns fwhm). Decay curves are acquired using a TDC having 40 ps fwhm resolution over an 84 ms dynamic range. A computer controlled monochromator can be inserted into the optical path to measure the emission spectrum or wavelength resolved decay time. A computer-controlled sample changer allows up to 64 samples to be measured without intervention. RP UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, MAILSTOP 55-121, BERKELEY, CA 94720 USA. NR 8 TC 17 Z9 19 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 1350-4487 J9 RADIAT MEAS JI Radiat. Meas. PD OCT PY 1995 VL 24 IS 4 BP 337 EP 341 DI 10.1016/1350-4487(94)00111-D PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA TC701 UT WOS:A1995TC70100005 ER PT J AU NEAU, EL AF NEAU, EL TI RECENT ADVANCES IN THE DEVELOPMENT OF HIGH AVERAGE POWER INDUCTION ACCELERATORS FOR INDUSTRIAL AND ENVIRONMENTAL APPLICATIONS SO RADIATION PHYSICS AND CHEMISTRY LA English DT Article; Proceedings Paper CT 9th International Meeting on Radiation Processing CY SEP 11-16, 1994 CL ISTANBUL, TURKEY DE ELECTRON BEAM; ION BEAM; HIGH AVERAGE POWER; INDUCTION ADDER; MAGNETIC SWITCH AB Short-pulse accelerator technology developed during the early 1960's through the late 1980's is being extended to high average power systems capable of use in industrial and environmental applications. Processes requiring high dose levels and/or high volume throughput will require systems with beam power levels from several hundreds of kilowatts to megawatts. Beam accelerating potentials can range from less than 1 MeV to as much as 10 MeV depending on the type of beam, depth of penetration required, and the density of the product being treated. This paper addresses the present status of a family of high average power systems, with output beam power levels up to 200 kW, now in operation that use saturable core switches to achieve output pulse widths of 50 to 80 nanoseconds. Inductive adders and field emission cathodes are used to generate beams of electrons or x-rays at up to 2.5 MeV over areas of 1000 cm(2). Similar high average power technology is being used at less than or equal to 1 MeV to drive repetitive ion beam sources for treatment of material surfaces over 100's of cm(2). RP NEAU, EL (reprint author), SANDIA NATL LABS,MS1152,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 15 TC 1 Z9 1 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0146-5724 J9 RADIAT PHYS CHEM JI Radiat. Phys. Chem. PD OCT-DEC PY 1995 VL 46 IS 4-6 BP 485 EP 488 DI 10.1016/0969-806X(95)00200-H PN 1 PG 4 WC Chemistry, Physical; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical SC Chemistry; Nuclear Science & Technology; Physics GA TD685 UT WOS:A1995TD68500019 ER PT J AU GOKTEPE, OF AF GOKTEPE, OF TI REGULATIONS AND MANAGEMENT-PRACTICES FOR ACCELERATOR FACILITIES IN THE US SO RADIATION PHYSICS AND CHEMISTRY LA English DT Article; Proceedings Paper CT 9th International Meeting on Radiation Processing CY SEP 11-16, 1994 CL ISTANBUL, TURKEY DE PERSONAL PROTECTION; ENVIRONMENTAL PROTECTION; LAWS; REGULATIONS; GUIDELINES; IMPLEMENTATION PLANS; HAZARD CLASSIFICATION; RISK ASSESSMENT AB There are applications of accelerators in the fields of health, food preservation, energy, environmental monitoring and protection, and industrial processing. This paper discusses the regulations and guidelines that apply to design, construction and operation of an accelerator facility. Emphasis is given to the management practices in personal and environmental protection and some examples of such practices applied at the U.S. Department of Energy accelerators are discussed. C1 GEORGETOWN UNIV,DEPT PHYS,WASHINGTON,DC 20057. RP GOKTEPE, OF (reprint author), US DOE,DIV HIGH ENERGY PHYS,ER-22 GERMANTOWN,WASHINGTON,DC 20585, USA. NR 8 TC 0 Z9 0 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0146-5724 J9 RADIAT PHYS CHEM JI Radiat. Phys. Chem. PD OCT-DEC PY 1995 VL 46 IS 4-6 BP 1343 EP 1347 DI 10.1016/0969-806X(95)00383-9 PN 2 PG 5 WC Chemistry, Physical; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical SC Chemistry; Nuclear Science & Technology; Physics GA TD120 UT WOS:A1995TD12000084 ER PT J AU SAFFER, JD THURSTON, SJ AF SAFFER, JD THURSTON, SJ TI SHORT EXPOSURES TO 60 HZ MAGNETIC-FIELDS DO NOT ALTER MYC EXPRESSION IN HL-60 OR DAUDI CELLS SO RADIATION RESEARCH LA English DT Article ID FREQUENCY ELECTROMAGNETIC-FIELDS; HUMAN PERIPHERAL LYMPHOCYTES; SINGLE-STRAND BREAKS; OCCUPATIONAL EXPOSURE; C-MYC; MAMMALIAN-CELLS; ELECTRIC-FIELDS; MESSENGER-RNA; LEUKEMIA; CANCER AB Analysis of changes in gene expression induced by 60 Hz magnetic fields has been considered to support an association between exposure to magnetic fields and cancer risk. Several reports have indicated that these fields rapidly activate many genes in mammalian cells. However, previous studies in this area have not provided sufficient information to support the conclusions drawn. To clarify this controversial research, we have attempted to validate, under rigorously controlled conditions, key experiments on induction of gene expression by magnetic fields. An extensive series of experiments, incorporating critical improvements in experimental design, most notably blind exposures and internal standards, was performed with human HL60 and Daudi cells. Exposure conditions covered a range of flux densities (5.7 mu T to 10 mT) and times (20-60 min). No alteration in the human MYC gene, commonly referred to as c-myc, or beta-actin steady-state mRNA levels was observed. The lack of an effect was not attributable to exposure geometry, timing of RNA preparation, or serum lot and concentration. To eliminate any remaining variables, exact replication was performed in one of the laboratories previously reporting gene expression effects; again, no evidence for altered MYC expression was found. Finally, differential display PCR indicated that extremely low-frequency magnetic field-induced changes in gene expression were not prevalent. (C) 1995 by Radiation Research Society RP SAFFER, JD (reprint author), PACIFIC NW LAB, BATTELLE BLVD,MSIN P7-53, RICHLAND, WA 99352 USA. FU NIEHS NIH HHS [R01 ES07122] NR 37 TC 72 Z9 73 U1 0 U2 1 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD OCT PY 1995 VL 144 IS 1 BP 18 EP 25 DI 10.2307/3579231 PG 8 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA RX681 UT WOS:A1995RX68100003 PM 7568767 ER PT J AU CIESIELSKI, B WIELOPOLSKI, L AF CIESIELSKI, B WIELOPOLSKI, L TI THE EFFECTS OF BORON ON THE ELECTRON-PARAMAGNETIC-RESONANCE SPECTRA OF ALANINE IRRADIATED WITH THERMAL-NEUTRONS SO RADIATION RESEARCH LA English DT Article ID L-ALPHA-ALANINE; CAPTURE THERAPY; DOSIMETRY; ENERGY; SYSTEM AB The effects of boric acid admixture on the intensity and line structure of EPR spectra of free radicals produced in alanine by thermal neutrons are presented. The EPR signal enhancement, up to a factor of 40 depending on the boron concentration, is related to additional energy deposition in alanine crystals by the disintegration products resulting from the capture of a thermal neutron by boron, B-10(n,alpha)Li-7. The changes in the shape of the EPR spectra observed by changing the microwave power are due to the differences in the microwave power saturation of the free radicals produced by a low-LET radiation and those produced by the high-LET components of the radiation after the neutron capture reaction. (C) 1995 by Radiation Research Society C1 BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. MED ACAD GDANSK,DEPT PHYS & BIOPHYS,PL-80211 GDANSK,POLAND. OI Ciesielski, Bartlomiej/0000-0001-8091-6040 FU FIC NIH HHS [IF05 TW004614-01] NR 27 TC 9 Z9 9 U1 0 U2 1 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD OCT PY 1995 VL 144 IS 1 BP 59 EP 63 DI 10.2307/3579236 PG 5 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA RX681 UT WOS:A1995RX68100008 PM 7568772 ER PT J AU WELLER, RE BUSCHBOM, RL DAGLE, GE RAGAN, HA PARK, JF AF WELLER, RE BUSCHBOM, RL DAGLE, GE RAGAN, HA PARK, JF TI HEPATIC-EFFECTS OF INHALED PLUTONIUM DIOXIDE IN BEAGLES SO RADIATION RESEARCH LA English DT Article ID LIVER-TUMORS; DOGS AB The effects of inhaled (PuO2)-Pu-238 deposited in the liver of dogs were studied in beagles exposed to initial lung depositions ranging from 5.7 to 2979.7 Bq/g lung. Approximately 20% of the initial lung deposition was translocated to the liver by 1500 days after exposure. Life-span observations revealed that the liver contained 40% of the final body burden of plutonium, second only to the skeleton. Elevated serum liver enzyme activities were observed in dogs with final liver depositions of greater than or equal to 0.4 Bq/g, cumulative dose to the liver of greater than or equal to 0.18 Gy and annual dose rate greater than or equal to 0.02 Gy/year. Enzyme elevations were seen at one dose level lower than that in which bone or lung tumors were observed. Linear regression analysis revealed strong to moderate correlation between cumulative dose and dose rate and time to observed increases in liver enzyme activities. Liver tumors were late-occurring neoplasms observed at lower exposure levels where life span was not shortened by lung and bone tumors. (C) 1995 by Radiation Research Society RP WELLER, RE (reprint author), PACIFIC NW LAB, DEPT BIOL & CHEM, RICHLAND, WA 99352 USA. NR 22 TC 2 Z9 2 U1 1 U2 1 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD OCT PY 1995 VL 144 IS 1 BP 73 EP 81 DI 10.2307/3579238 PG 9 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA RX681 UT WOS:A1995RX68100010 PM 7568774 ER PT J AU BROOKS, AL MIICK, R BUSCHBOM, RL MURPHY, MK KHAN, MA AF BROOKS, AL MIICK, R BUSCHBOM, RL MURPHY, MK KHAN, MA TI THE ROLE OF DOSE-RATE IN THE INDUCTION OF MICRONUCLEI IN DEEP-LUNG FIBROBLASTS IN-VIVO AFTER EXPOSURE TO CO-60 GAMMA-RAYS SO RADIATION RESEARCH LA English DT Note ID FISSION-SPECTRUM NEUTRONS; CHROMOSOMAL-ABERRATIONS; GENE-MUTATIONS; X-RAYS; TRANSFORMATION; CELLS AB To evaluate the influence of low-dose-rate exposures on biological damage, it is necessary to have cells that can be maintained in the same stage of the cell cycle for long periods. Normal rat lung fibroblasts represent a stable cell type with a slow turnover rate in vivo. These cells can be stimulated to divide by placing them in tissue culture. Therefore, a constant cell population can be exposed over a protracted time and stimulated to divide, and the cytogenetic damage can be evaluated at the first cell division after exposure. By placing rats at different distances from a Co-60 source, they were exposed to graded doses of gamma rays - 0.0, 3.9, 7.4 and 11.3 Gy - protracted over either 4 or 67 h. Fibroblasts were isolated from the lung and cultured for 24 h; after cytochalasin B was added, the cells were cultured for an additional 69 to 72 h. The percentage binucleated cells in fibroblasts of animals exposed for 4 or 67 h was 47.1 +/- 4.3 and 62.1 +/- 3.9. There was no influence of dose on the percentage binucleated cells, but the fraction of cells that divided at 67 h was significantly higher (P < 0.05) than observed at 4 h. Cells were scored for micronuclei on coded slides. The dose-response data from animals exposed for 4 and 67 h were fitted to the following linear dose-response relationships, where D = dose: micronuclei/binucleated cell = 0.02 +/- 0.03 + 2.38 +/- 0.44 x 10(-2) D, and micronuclei/binucleated cell = 0.01 +/- 0.06 + 1.01 +/- 0.10 x 10(-2) D, respectively. The r(2) values for the two curves were 0.67 and 0.91, indicating the goodness of fit for the data for the 4- and 67-h treatments. The slopes were different from zero and each other at the P < 0.05 level of significance. The effectiveness of the Co-60 exposure decreased as the dose rate decreased. At dose rates below 0.17 Gym, the effectiveness remained constant over the range of doses and dose rates used. Comparing the slope of the dose response for the lowest exposure rate to that from information published previously, the dose-rate effectiveness factor was 6.14 +/- 0.65 for the induction of micronuclei in deep-lung fibroblasts. This paper describes how these data, derived at low dose rates, were used to estimate that the relative biological effectiveness (RBE(M)) of Co-60 and radon was 65.2 +/- 8.4 when the exposures were delivered over similar lengths of time. These studies emphasize the importance of using the proper dose rate for low-LET radiation in estimation of RBE. (C) 1995 by Radiation Research Society RP BROOKS, AL (reprint author), PACIFIC NW LAB, CTR LIFE SCI, RICHLAND, WA 99352 USA. NR 24 TC 13 Z9 14 U1 0 U2 0 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD OCT PY 1995 VL 144 IS 1 BP 114 EP 118 DI 10.2307/3579244 PG 5 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA RX681 UT WOS:A1995RX68100016 PM 7568765 ER PT J AU SUITS, AG HEIMANN, P YANG, XM EVANS, M HSU, CW LU, KT LEE, YT KUNG, AH AF SUITS, AG HEIMANN, P YANG, XM EVANS, M HSU, CW LU, KT LEE, YT KUNG, AH TI A DIFFERENTIALLY PUMPED HARMONIC FILTER ON THE CHEMICAL-DYNAMICS BEAMLINE AT THE ADVANCED LIGHT-SOURCE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB A differentially pumped rare gas cell has been developed to suppress undulator harmonics on the Chemical Dynamics Beamline at the Advanced Light Source. Greater than 10(4) suppression of the harmonics has been demonstrated with no measurable (<5%) attenuation of the fundamental. The overall design is presented, and vacuum and optical performance are reported. (C) 1995 American Institute of Physics. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ACCELERATOR & FUS RES,BERKELEY,CA 94720. ACAD SINICA,INST ATOM & MOLEC SCI,TAIPEI 10764,TAIWAN. RP SUITS, AG (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720, USA. RI Lee, Yuan-Tseh/F-7914-2012; Kung, Andy/F-7909-2012; Yang, Xueming/C-8764-2013 NR 5 TC 76 Z9 82 U1 1 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1995 VL 66 IS 10 BP 4841 EP 4844 DI 10.1063/1.1146161 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA TA431 UT WOS:A1995TA43100009 ER PT J AU RESS, D LERCHE, RA ELLIS, RJ HEATON, GW LEHR, DE AF RESS, D LERCHE, RA ELLIS, RJ HEATON, GW LEHR, DE TI HIGH-SENSITIVITY SCINTILLATING-FIBER IMAGING DETECTOR FOR HIGH-ENERGY NEUTRONS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID INERTIAL CONFINEMENT FUSION; RADIOGRAPHY; TARGETS AB We have created a detector to image the neutrons emitted by imploded inertial-confinement fusion targets. The 14 MeV neutrons, which are produced by deuterium-tritium fusion events in the target, pass through an aperture to create an image on the detector. The neutron radiation is converted to blue light (430 nm) with a 20 cm(2) array of plastic scintillating fibers. Each fiber is 10 cm long with a 1 mm(2) cross section; approximately 35 000 fibers make up the array. The resulting blue-light image is reduced in size and amplified by a sequence of fiber-optic tapers and image intensifiers, then acquired by a charge-coupled device camera. The fiber-optic readout system was tested separately for overall throughput and spatial resolution; the throughput was 0.22 electrons/photon, and the resolution was 0.8 mm. We also characterized the overall efficiency of the detector using the DT-fusion neutrons emitted by inertial confinement targets; the measured value was 14 electrons/pixel/neutron. Several neutron images of laser-fusion targets have been obtained with the detector. We describe the detector, present characterization results, and give examples of the neutron images. (C) 1995 American Institute of Physics. C1 STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305. RP RESS, D (reprint author), LAWRENCE LIVERMORE NATL LAB,L-473,LIVERMORE,CA 94551, USA. NR 19 TC 19 Z9 23 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1995 VL 66 IS 10 BP 4943 EP 4948 DI 10.1063/1.1146179 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA TA431 UT WOS:A1995TA43100028 ER PT J AU CASTOLDI, A REHAK, P AF CASTOLDI, A REHAK, P TI ELECTRON-DRIFT TIME IN SILICON DRIFT DETECTORS - A TECHNIQUE FOR HIGH-PRECISION MEASUREMENT OF ELECTRON-DRIFT MOBILITY SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID CHARGE; CHAMBERS; VELOCITY AB This paper presents a precise absolute measurement of the drift velocity and mobility of electrons in high resistivity silicon at room temperature. The electron velocity is obtained from the differential measurement of the drift time of an electron cloud in a silicon drift detector. The main features of the transport scheme of this class of detectors are: the high uniformity of the electron motion, the transport of the signal electrons entirely contained in the high-purity bulk, the low noise timing due to the very small anode capacitance (typical value 100 fF), and the possibility to measure different drift distances, up to the wafer diameter, in the same semiconductor sample. These features make the silicon drift detector an optimal device for high precision measurements of carrier drift properties. The electron drift velocity and mobility in a 10 k Ohm cm NTD n-type silicon wafer have been measured as a function of the electric field in the range of possible operation of a typical drift detector (167-633 V/cm). The electron ohmic mobility is found to be 1394 cm(2)/V s. The measurement precision is better than 1%. (C) 1995 American Institute of Physics. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 13 TC 11 Z9 11 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1995 VL 66 IS 10 BP 4989 EP 4995 DI 10.1063/1.1146121 PG 7 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA TA431 UT WOS:A1995TA43100037 ER PT J AU ERSKINE, DJ AF ERSKINE, DJ TI IMPROVED ARRANGEMENT OF SHOCK-DETECTING PINS IN SHOCK EQUATION OF STATE EXPERIMENTS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB Shock wave speeds are often measured by comparing arrival times at the tips of electrical shorting pins in a hexagonal array over two elevations (called up and down). In the conventional arrangement, the center pin is solely responsible for measuring the curvature of the wave front. Without this datum the shock speed cannot be precisely determined. In some experiments this pin fails frequently enough to be a problem. We report a simple rearrangement between up and down designated pins which eliminates the critical reliance on a single pin. (C) 1995 American Institute of Physics. RP ERSKINE, DJ (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 8 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1995 VL 66 IS 10 BP 5032 EP 5036 DI 10.1063/1.1146523 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA TA431 UT WOS:A1995TA43100043 ER PT J AU BALDWIN, E AF BALDWIN, E TI CAUSES OF DEATH IN THE WORKPLACE - LEIGH,JP SO RISK ANALYSIS LA English DT Book Review RP BALDWIN, E (reprint author), OAK RIDGE NATL LAB,1060 COMMERCE PK DR,MS-6480,OAK RIDGE,TN 37830, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD OCT PY 1995 VL 15 IS 5 BP 611 EP 612 PG 2 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA TJ474 UT WOS:A1995TJ47400009 ER PT J AU BALDWIN, E AF BALDWIN, E TI COMMUNITY RISK PROFILES - WERNICK,IK SO RISK ANALYSIS LA English DT Book Review RP BALDWIN, E (reprint author), OAK RIDGE NATL LAB,1060 COMMERCE PK DR,MS-6480,OAK RIDGE,TN 37830, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD OCT PY 1995 VL 15 IS 5 BP 611 EP 611 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA TJ474 UT WOS:A1995TJ47400008 ER PT J AU BALDWIN, E AF BALDWIN, E TI INTRODUCTION TO ENVIRONMENTAL TOXICOLOGY - IMPACTS OF CHEMICALS UPON ECOLOGICAL-SYSTEMS - LANDIS,WC, YU,MH SO RISK ANALYSIS LA English DT Book Review RP BALDWIN, E (reprint author), OAK RIDGE NATL LAB,1060 COMMERCE PK DR,MS-6480,OAK RIDGE,TN 37830, USA. NR 1 TC 0 Z9 0 U1 0 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD OCT PY 1995 VL 15 IS 5 BP 612 EP 612 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA TJ474 UT WOS:A1995TJ47400010 ER PT J AU LI, HX HAMILTON, ML JONES, RH AF LI, HX HAMILTON, ML JONES, RH TI EFFECT OF HEAT-TREATMENT ON GRAIN-BOUNDARY CHEMISTRY AND FRACTURE PROPERTIES OF A V-5CR-5TI ALLOY SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP LI, HX (reprint author), ASSOCIATED WESTERN UNIV, NW DIV, POB 999, P8-15, RICHLAND, WA 99352 USA. NR 5 TC 5 Z9 6 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD OCT 1 PY 1995 VL 33 IS 7 BP 1063 EP 1068 DI 10.1016/0956-716X(95)00345-V PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA RU738 UT WOS:A1995RU73800008 ER PT J AU NIEH, TG WANG, JN AF NIEH, TG WANG, JN TI STRESS CHANGE AND ITS IMPLICATION FOR THE REDUCTION OF PRIMARY CREEP IN GAMMA-TIAL SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID TITANIUM ALUMINIDE; ALLOY; DEFORMATION; CAST RP NIEH, TG (reprint author), LAWRENCE LIVERMORE NATL LAB,L-350,POB 808,LIVERMORE,CA 94550, USA. RI Nieh, Tai-Gang/G-5912-2011 OI Nieh, Tai-Gang/0000-0002-2814-3746 NR 25 TC 13 Z9 13 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD OCT 1 PY 1995 VL 33 IS 7 BP 1101 EP 1107 DI 10.1016/0956-716X(95)00323-N PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA RU738 UT WOS:A1995RU73800014 ER PT J AU VO-DINH, T AF VO-DINH, T TI SERS CHEMICAL SENSORS AND BIOSENSORS - NEW TOOLS FOR ENVIRONMENTAL AND BIOLOGICAL ANALYSIS SO SENSORS AND ACTUATORS B-CHEMICAL LA English DT Article DE SERS SENSORS; SPECTROSCOPY; ENVIRONMENTAL ANALYSIS; BIOLOGICAL ANALYSIS ID ENHANCED RAMAN-SCATTERING; SILVER ELECTRODE; SPECTROMETRY; SPECTROSCOPY AB This paper describes recent advances in chemical sensors and biosensors based on surface-enhanced Raman scattering (SERS) detection. The SERS-active probes involve silver-coated microstructured substrates designed to amplify the Raman signals of adsorbed molecules and to detect trace chemicals in liquid as well as vapor samples. The development and application of several SERS devices such as a fiber-optic remote sensor and a vapor dosimeter are described. The results illustrate the different uses of the SERS method for the identification and quantification of important environmental and biological compounds. RP VO-DINH, T (reprint author), OAK RIDGE NATL LAB, DIV HLTH SCI RES, ADV MONITORING DEV GRP, OAK RIDGE, TN 37831 USA. NR 23 TC 86 Z9 87 U1 1 U2 20 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0925-4005 J9 SENSOR ACTUAT B-CHEM JI Sens. Actuator B-Chem. PD OCT PY 1995 VL 29 IS 1-3 BP 183 EP 189 DI 10.1016/0925-4005(95)01681-3 PG 7 WC Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation SC Chemistry; Electrochemistry; Instruments & Instrumentation GA TD753 UT WOS:A1995TD75300027 ER PT J AU HOLIAN, BL AF HOLIAN, BL TI ATOMISTIC COMPUTER-SIMULATIONS OF SHOCK-WAVES SO SHOCK WAVES LA English DT Article DE CONDENSED MATTER; MOLECULAR DYNAMICS; NUMERICAL SIMULATION ID ONE-DIMENSIONAL CHAINS; MOLECULAR-DYNAMICS; DEFORMATION AB I present a brief history, from my own personal perspective, of molecular dynamics (MD) computer simulations of shock waves without chemical reaction. Beginning with radiation-damage cascades in the 1960's, followed by shock waves in perfect crystals in the 1970's, dense fluids in the 1980's, and dilute gases in the 1990's, the field of MD simulations (not to mention the computers supporting them) has evolved to the point where we can begin to study weak-shock induced plasticity in the solid state, which is dominated by sparsely distributed initial defects. Finally, I conclude with a brief discussion of new developments in the related area of simulating shock-induced spallation in solids, and comment on atomistic simulations of shockwave phenomena of the future (including chemical reaction), made possible by the advent of massively parallel computers. RP HOLIAN, BL (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 37 TC 60 Z9 62 U1 4 U2 27 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0938-1287 J9 SHOCK WAVES JI Shock Waves PD OCT PY 1995 VL 5 IS 3 BP 149 EP 157 DI 10.1007/BF01435522 PG 9 WC Mechanics SC Mechanics GA TC951 UT WOS:A1995TC95100004 ER PT J AU SUN, XB BISCHOF, C AF SUN, XB BISCHOF, C TI A BASIS-KERNEL REPRESENTATION OF ORTHOGONAL MATRICES SO SIAM JOURNAL ON MATRIX ANALYSIS AND APPLICATIONS LA English DT Article DE ORTHOGONAL MATRICES; BLOCK ELIMINATION; ORTHOGONALITY CONDITION; BASIS-KERNEL REPRESENTATION; CAYLEY TRANSFORM; HOUSEHOLDER MATRICES ID HOUSEHOLDER TRANSFORMATIONS AB In this paper we introduce a new representation of orthogonal matrices. We show that any orthogonal matrix can be represented in the form Q = I - YSYT, which we call the basis-kernel representation of Q. In particular, we point out that the kernel S can be chosen to be triangular and that a familiar representation of an orthogonal matrix as a product of Householder matrices can be readily deduced from a basis-kernel representation with triangular kernel. We also show that there exists, in some sense, a minimal orthogonal transformation between two subspaces of same dimension, an important application of which is on block elimination problems. We explore how the basis Y determines the subspaces that Q acts on in a nontrivial fashion, and how S determines the way Q acts on this subspace. Especially, there is a canonical representation that explicitly shows that Q partitions R(n) into three invariant subspaces in which it acts as the identity, a reflector, and a rotator, respectively, We also present a generalized Cayley representation for arbitrary orthogonal matrices, which illuminates the degrees of freedom we have in choosing orthogonal matrices acting on a predetermined subspace. RP SUN, XB (reprint author), ARGONNE NATL LAB,DIV MATH & COMP SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Bischof, Christian/D-2897-2009 NR 14 TC 7 Z9 7 U1 0 U2 1 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER PH#382-9800, PHILADELPHIA, PA 19104-2688 SN 0895-4798 J9 SIAM J MATRIX ANAL A JI SIAM J. Matrix Anal. Appl. PD OCT PY 1995 VL 16 IS 4 BP 1184 EP 1196 DI 10.1137/S0895479894276369 PG 13 WC Mathematics, Applied SC Mathematics GA RY079 UT WOS:A1995RY07900012 ER PT J AU WRIGHT, SJ AF WRIGHT, SJ TI STABILITY OF LINEAR-EQUATIONS SOLVERS IN INTERIOR-POINT METHODS SO SIAM JOURNAL ON MATRIX ANALYSIS AND APPLICATIONS LA English DT Article DE PRIMAL-DUAL INTERIOR-POINT METHODS; ERROR ANALYSIS; STABILITY AB Primal-dual interior-point methods for linear complementarity and linear programming problems solve a linear system of equations to obtain a modified Newton step at each iteration. These linear systems become increasingly ill-conditioned in the later stages of the algorithm, but the computed steps are often sufficiently accurate to be useful. We use error analysis techniques tailored to the special structure of these linear systems to explain this observation and examine how theoretically superlinear convergence of a path-following algorithm is affected by the roundoff errors. RP WRIGHT, SJ (reprint author), ARGONNE NATL LAB,DIV MATH & COMP SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 20 TC 18 Z9 18 U1 1 U2 1 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER PH#382-9800, PHILADELPHIA, PA 19104-2688 SN 0895-4798 J9 SIAM J MATRIX ANAL A JI SIAM J. Matrix Anal. Appl. PD OCT PY 1995 VL 16 IS 4 BP 1287 EP 1307 DI 10.1137/S0895479893260498 PG 21 WC Mathematics, Applied SC Mathematics GA RY079 UT WOS:A1995RY07900018 ER PT J AU ELTON, BH LEVERMORE, CD RODRIGUE, GH AF ELTON, BH LEVERMORE, CD RODRIGUE, GH TI CONVERGENCE OF CONVECTIVE-DIFFUSIVE LATTICE BOLTZMANN METHODS SO SIAM JOURNAL ON NUMERICAL ANALYSIS LA English DT Article DE CONSISTENCY; CONVECTION-DIFFUSION CONVERGENCE; EXPLICIT; HILBERT EXPANSION; FINITE DIFFERENCE; LATTICE BOLTZMANN; LATTICE GAS; MONOTONE; STABILITY ID TIME CORRELATION-FUNCTIONS; GAS AUTOMATA; TRANSPORT; EQUATION; FLUID AB Lattice Boltzmann methods are numerical schemes derived as a kinetic approximation of an underlying lattice gas. PI numerical convergence theory for nonlinear convective-diffusive lattice Boltzmann methods is established. Convergence, consistency, and stability are defined through truncated Hilbert expansions. In this setting it is shown that consistency and stability imply convergence. Monotone lattice Boltzmann methods are defined and shown to be stable, and hence convergent when consistent. Examples of diffusive and convective-diffusive lattice Boltzmann methods that are both consistent and monotone are presented. C1 UNIV ARIZONA,DEPT MATH,TUCSON,AZ 85721. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. UNIV CALIF DAVIS,DEPT APPL SCI,DAVIS,CA. RP ELTON, BH (reprint author), FUJITSU AMER INC,SUPERCOMP GRP,3055 ORCHARD DR,SAN JOSE,CA 95134, USA. NR 29 TC 12 Z9 12 U1 1 U2 5 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER PH#382-9800, PHILADELPHIA, PA 19104-2688 SN 0036-1429 J9 SIAM J NUMER ANAL JI SIAM J. Numer. Anal. PD OCT PY 1995 VL 32 IS 5 BP 1327 EP 1354 DI 10.1137/0732062 PG 28 WC Mathematics, Applied SC Mathematics GA RX186 UT WOS:A1995RX18600001 ER PT J AU PRUESS, S FULTON, CT XIE, YT AF PRUESS, S FULTON, CT XIE, YT TI AN ASYMPTOTIC NUMERICAL-METHOD FOR A CLASS OF SINGULAR STURM/LIOUVILLE PROBLEMS SO SIAM JOURNAL ON NUMERICAL ANALYSIS LA English DT Article DE STURM-LIOUVILLE PROBLEMS; APPROXIMATING THE COEFFICIENTS; SINGULAR DIFFERENTIAL EQUATIONS; ASYMPTOTIC NUMERICAL METHODS ID SOFTWARE AB A class of Sturm-Liouville problems has been discovered for which the method of approximating the coefficients by piecewise constant functions has considerable difficulty. We characterize this class, give examples, and derive a modification of the method based on local asymptotic approximations which surmounts the difficulties. C1 FLORIDA INST TECHNOL,DEPT APPL MATH,MELBOURNE,FL 32901. NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80215. RP PRUESS, S (reprint author), COLORADO SCH MINES,DEPT MATH & COMP SCI,GOLDEN,CO 80401, USA. NR 11 TC 12 Z9 12 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER PH#382-9800, PHILADELPHIA, PA 19104-2688 SN 0036-1429 J9 SIAM J NUMER ANAL JI SIAM J. Numer. Anal. PD OCT PY 1995 VL 32 IS 5 BP 1658 EP 1676 DI 10.1137/0732074 PG 19 WC Mathematics, Applied SC Mathematics GA RX186 UT WOS:A1995RX18600013 ER PT J AU DAVIS, JG BURGOA, B AF DAVIS, JG BURGOA, B TI INTERACTIVE MECHANISMS OF ANION ADSORPTION WITH CALCIUM LEACHING AND EXCHANGE SO SOIL SCIENCE LA English DT Article ID CHARGE CHARACTERISTICS; SURFACE-CHARGE; SOILS; SULFATE; PHOSPHATE; TRANSPORT; GOETHITE; TROPICS; OXISOLS; GYPSUM AB Anions can be adsorbed to soil colloids by specific (inner-sphere complexation) and nonspecific adsorption (outer-sphere complexation and diffuse ion association). The mechanism for anion adsorption determines whether and by what reaction anions in soil solution mill enhance metal adsorption. The objectives of this study were (i) to determine the influence of the accompanying anion on Ca leaching and cation exchange in a sandy, kaolinitic Ultisol, (ii) to describe possible mechanisms for anion effects on Ca adsorption based on diffuse double-layer theory, and (iii) to discuss the practical implications of these mechanisms on soil fertility management. The Ca forms used in this study were calcium chloride, calcium nitrate, calcium sulfate, calcium phosphate, and calcium carbonate. Undisturbed soil cores from a Plinthic Kandiudult were collected, and a Ca solution (5, 500, and 1500 mg L(-1)) was applied to soil columns. The effluent was collected from each column, and cations (Ca2+, Mg2+, K+) in solution mere measured. Exchangeable bases and effective cation exchange capacity (CEC) were measured in soil hom soil cores after effluent collection. Sulfate and phosphate retarded Ca breakthrough, compared with chloride and nitrate. Specific adsorption of sulfate and phosphate in the inner-sphere increased the net negative surface charge of the soil and, thus, increased Ca adsorption. Higher influent concentration increased the extent of ion pairing (CaS0(4) degrees), and consequently, enhanced Ca adsorption directly. Calcium breakthrough was most gradual in the carbonate effluent as a result of ion pairing and increased pH dependent charge leading to both direct and indirect enhancement of Ca adsorption. The Mg peaks for phosphate and carbonate were broader and shorter than those peaks for nitrate, chloride, and sulfate. The choice of the accompanying anion in Ca fertilizer materials could be critical in controlling the leaching of Ca from the soil surface and optimizing the exchange and subsequent leaching of other cations. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RP DAVIS, JG (reprint author), UNIV GEORGIA,COASTAL PLAIN EXPT STN,TIFTON,GA 31793, USA. RI Davis, Jessica/C-1903-2013 NR 29 TC 9 Z9 10 U1 0 U2 3 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0038-075X J9 SOIL SCI JI Soil Sci. PD OCT PY 1995 VL 160 IS 4 BP 256 EP 264 DI 10.1097/00010694-199510000-00004 PG 9 WC Soil Science SC Agriculture GA TA659 UT WOS:A1995TA65900004 ER PT J AU KIRKPATRICK, RJ BROW, RK AF KIRKPATRICK, RJ BROW, RK TI NUCLEAR-MAGNETIC-RESONANCE INVESTIGATION OF THE STRUCTURES OF PHOSPHATE AND PHOSPHATE-CONTAINING GLASSES - A REVIEW SO SOLID STATE NUCLEAR MAGNETIC RESONANCE LA English DT Review DE GLASSES; PHOSPHATES; P-31 NUCLEAR MAGNETIC RESONANCE ID SODIUM ALUMINOPHOSPHATE GLASS; SHORT-RANGE STRUCTURE; NMR CHEMICAL-SHIFTS; P-31 NMR; BOROPHOSPHATE GLASSES; METAPHOSPHATE GLASSES; SILICATE-GLASSES; SPINNING NMR; SPECTROSCOPY; PHOSPHORUS AB This paper presents a review of the nuclear magnetic resonance (NMR) data for phosphate and phosphate-containing glasses obtained primarily within the past 10 years and of the structural interpretations based on those data. Compositions discussed include P2O5, alkali and alkaline earth phosphates, aluminophosphates, borophosphates, fluorophosphates, and phosphate-containing silicate and aluminosilicate glasses. P-31 NMR data, in conjunction with Al-27, Si-29, B-11, Li-7, and Na-23 data if appropriate, have proven very powerful in providing direct evidence about the local structural environments present in the these materials and in many cases have allowed interpretation of the physical and chemical behavior of these glasses in terms of polyhedral structures. C1 SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. RP UNIV ILLINOIS, DEPT GEOL, URBANA, IL 61801 USA. NR 51 TC 206 Z9 208 U1 10 U2 89 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0926-2040 EI 1527-3326 J9 SOLID STATE NUCL MAG JI Solid State Nucl. Magn. Reson. PD OCT PY 1995 VL 5 IS 1 BP 9 EP 21 DI 10.1016/0926-2040(95)00042-O PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical; Physics, Condensed Matter; Spectroscopy SC Chemistry; Physics; Spectroscopy GA TA304 UT WOS:A1995TA30400003 PM 8748641 ER PT J AU Vincze, L Janssens, K Adams, F Jones, KW AF Vincze, L Janssens, K Adams, F Jones, KW TI A general monte carlo simulation of energy-dispersive X-ray fluorescence spectrometers .3. Polarized polychromatic radiation, homogeneous samples SO SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY LA English DT Article ID UNPOLARIZED RADIATION; SCATTERING; RAYLEIGH; COMPTON AB A general Monte Carlo (MC) code, capable of simulating photon-matter interactions in the energy range of 1-80 keV, has been adapted to model the behavior of synchrotron radiation X-ray fluorescence (SR-XRF) spectrometers using polarized, polychromatic radiation as means of excitation. A brief description of the simulation method specific for polychromatic excitation is presented for homogeneous, multielement samples. The code has been verified by comparing calculated spectral distributions of samples of various nature with experimentally collected data, taken at the bending magnet source based X26A SR-XRF beamline installed at the National Synchrotron Light Source (NSLS). Simulated results have also been compared with previously developed analytical calculations. Applications of the program in the field of quantitative analysis of biological and glass materials are presented and the use of the software to study the influence of the changes in the excitation-detection geometry on the predicted spectral distributions is demonstrated. Depending on the thickness and matrix type of the samples, the average deviations of the predicted fluorescent line and scatter background intensities relative to the experimentally obtained values are in the 3-12% range for homogeneous samples. C1 UNIV ANTWERP,DEPT CHEM,B-2610 ANTWERP,BELGIUM. BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. RI Janssens, Koen/B-8049-2011 OI Janssens, Koen/0000-0002-6752-6408 NR 16 TC 36 Z9 37 U1 0 U2 10 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0584-8547 J9 SPECTROCHIM ACTA B JI Spectroc. Acta Pt. B-Atom. Spectr. PD OCT PY 1995 VL 50 IS 12 BP 1481 EP 1500 DI 10.1016/0584-8547(95)01361-X PG 20 WC Spectroscopy SC Spectroscopy GA TL819 UT WOS:A1995TL81900008 ER PT J AU INGERLY, DB ELLINGSON, WA PILLAI, TAK VASANTHAMOHAN, N AF INGERLY, DB ELLINGSON, WA PILLAI, TAK VASANTHAMOHAN, N TI USE OF X-RAY-IMAGING FOR THE EVALUATION OF SUPERCONDUCTING CERAMICS FABRICATED BY THE POWDER-IN-TUBE METHOD SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY LA English DT Article AB High-spatial-resolution microfocus-based x-ray imaging technology, both real-time and film, has been used to study the thickness variation that occurs in the oxide core of silver-sheathed BSCCO ribbons produced by the powder-in-tube method. This thickness variation (also called 'sausaging') occurs during incremental rolling and degrades the critical current densities of the ribbons. Using x-ray image data, we determined the onset and severity of sausaging. Onset occurred at a ribbon thickness of 203 mu m, and the severity increased with subsequent rolling reductions. Scanning electron microscopy was used to confirm the x-ray image data. X-ray imaging provides several advantages over more traditional methods of characterizing the superconductors, such as optical or scanning electron microscopy. The x-ray imaging provides nondestructive information about the entire width of the ribbon, with far greater speed, lower cost, and more flexibility than the traditional techniques. RP INGERLY, DB (reprint author), ARGONNE NATL LAB,DIV ENERGY TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-2048 J9 SUPERCOND SCI TECH JI Supercond. Sci. Technol. PD OCT PY 1995 VL 8 IS 10 BP 779 EP 782 DI 10.1088/0953-2048/8/10/007 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA RY769 UT WOS:A1995RY76900007 ER PT J AU Walter, KC Kung, H Levine, T Tesmer, JT Kodali, P Wood, BP Rej, DJ Nastasi, M Koskinen, J Hirvonen, JP AF Walter, K. C. Kung, H. Levine, T. Tesmer, J. T. Kodali, P. Wood, B. P. Rej, D. J. Nastasi, M. Koskinen, J. Hirvonen, J. P. TI Characterization and performance of diamond-like carbon films synthesized by plasma- and ion-beam-based techniques SO SURFACE & COATINGS TECHNOLOGY LA English DT Article DE diamond-like carbon; cathodic arc; wear; friction ID TRIBOLOGICAL PROPERTIES; DEPOSITION AB Diamond-like carbon (DLC) films have been deposited on dissimilar substrates using three different deposition processes. Two well-studied deposition methods, employing cathodic arcs and r.f. plasma self-bias, have been used. These two processes differ in that cathodic arc processes use gas pressures less than 1 mTorr (0.13 Pa) and deposit atomic ions with energies less than 100 eV, while r.f. plasma self-bias processes use gas pressures greater than 1 mTorr (0.13 Pa) and deposit molecular ions with energies greater than 100 eV. In addition, DLC films have been deposited using a new plasma-based, pulsed-bias process. The pulsed-bias process uses gas pressures greater than 1 retort (0.13 Pa) and deposits molecular ions with energies greater than 1000 eV. Both the self-bias and the pulsed-bias processes utilized hydrocarbon gases as the carbon source. Cathodic arc processes generally rely on the arc between two graphite electrodes as the carbon source. Deposited films from all three processes have been characterized using ion backscattering techniques, elastic recoil spectrometry, transmission electron microscopy (TEM) and selected-area diffraction. Films deposited using the cathodic arc process are virtually hydrogen free while the self-bias and pulsed-bias films contain up to 40% H. TEM results indicated that the films are homogeneous and amorphous. The hardness, elastic modulus, coefficient of friction and wear rate of the films are also reported. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. VTT Mfg Technol, Helsinki, Finland. RP Walter, KC (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. RI Koskinen, Jari/J-3886-2014 NR 25 TC 17 Z9 18 U1 1 U2 2 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD OCT PY 1995 VL 74-75 IS 1-3 BP 734 EP 738 DI 10.1016/0257-8972(94)08203-0 PN 2 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA V43WA UT WOS:000202964000019 ER PT J AU Hirvonen, JP Suni, I Kattelus, H Lappalainen, R Torri, P Kung, H Jervis, TR Nastasi, M Tesmer, JR AF Hirvonen, J. -P. Suni, I. Kattelus, H. Lappalainen, R. Torri, P. Kung, H. Jervis, T. R. Nastasi, M. Tesmer, J. R. TI Crystallization and oxidation behavior of Mo-Si-N coatings SO SURFACE & COATINGS TECHNOLOGY LA English DT Article DE oxidation; amorphous coatings; crystallization; ion beam analysis AB Mo-Si-N coatings with different nitrogen concentrations were produced by nitrogen alloying simultaneously during sputter deposition from a planar magnetron MoSi2 target with nitrogen plasma onto steel substrates. The ratio of molybdenum and silicon concentrations was 0.5. The nitrogen concentrations of the samples were 20, 35, and 50 at.% and the concentration profile was uniform throughout the film thickness. The initial microstructure at all nitrogen concentrations involved was amorphous and the crystaliization temperature was strongly dependent on nitrogen concentration. The sample with 50 at.% N was still amorphous after annealing at 1000 degrees C whereas the sample with 35 at.% N was crystallized at 740-760 degrees C and the sample with 20 at.% N at 660-680 degrees C. Even this was higher than the crystallization temperature of a pure MoSi2 coating, about 500 degrees C. The oxidation behavior of the Mo-Si-N coatings with 50 at.% N was determined in wet oxidation conditions from 400 to 1000 degrees C by measuring oxygen concentration on the surface using a nuclear reaction O-16(d, p)O-17 or non-Rutherford scattering of He+. The excellent oxidation resistance of this coating on low carbon steel was confirmed up to 800 degrees C, above which diffusion of nitrogen occurred, resulting in crystallization and degrading of the beneficial properties. The oxidation behavior of the Mo-Si-N coating can be explained in terms of amorphous microstructure and silicon-nitrogen interaction. C1 VTT Mfg Technol, FIN-02044 Espoo, Finland. VTT Elect, FIN-02044 Espoo, Finland. Univ Helsinki, Dept Phys, FIN-00014 Helsinki, Finland. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Hirvonen, JP (reprint author), VTT Mfg Technol, POB 1703, FIN-02044 Espoo, Finland. NR 9 TC 17 Z9 18 U1 1 U2 3 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD OCT PY 1995 VL 74-75 IS 1-3 BP 981 EP 985 DI 10.1016/0257-8972(95)08327-8 PN 2 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA V43WA UT WOS:000202964000057 ER PT J AU CHAMBERS, SA GAO, Y LIANG, Y AF CHAMBERS, SA GAO, Y LIANG, Y TI THE EARLY STAGES OF MGO EPITAXY ON LATTICE-MATCHED CR0.7MO0.3(001) SO SURFACE SCIENCE LA English DT Article DE ATOMIC FORCE MICROSCOPY; ELECTRON-SOLID DIFFRACTION; EPITAXY; MAGNESIUM OXIDES; METAL-INSULATOR INTERFACES; MOLECULAR BEAM EPITAXY; PHOTOELECTRON DIFFRACTION; SINGLE-CRYSTAL EPITAXY ID ABSORPTION FINE-STRUCTURE; ELECTRONIC-STRUCTURE; ADHESION; ENHANCEMENT; DIFFRACTION; INTERFACES; MONOLAYER; STRENGTH; SURFACES; PT(111) AB We have investigated the structure and morphology of thin epitaxial overlayers of MgO on lattice-matched interlayers of Cr0.7Mo0.3 grown on MgO(001) substrates. Lattice matching results in unstrained MgO epitaxial films with short- and long-range structural order of comparable quality to those of buffer layers of MgO grown on MgO(001) under optimized step-flow growth conditions. In addition, the structural coherence of the oxide/metal interface is excellent due to lattice matching, in contrast to lattice-mismatched systems. However, MgO does not grow in a perfectly laminar fashion on Cr0.7Mo0.3 due to surface and interface free-energy imbalances; thin MgO films exhibit mean roughnesses of similar to 4 Angstrom with terrace widths of several hundred Angstrom. Nevertheless, the use of lattice-matched conducting interlayers between a bulk oxide substrate and an epitaxial thin film of the same material allows high-quality insulting oxides to be prepared on conducting substrates. This approach in turn permits the full arsenal of charged-particle spectroscopic, diffraction and imaging probes to be applied to investigations of the surface science of insulators. RP CHAMBERS, SA (reprint author), PACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, POB 999,MS K2-12, RICHLAND, WA 99352 USA. NR 40 TC 23 Z9 23 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD OCT 1 PY 1995 VL 339 IS 3 BP 297 EP 309 DI 10.1016/0039-6028(95)00610-9 PG 13 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA RV658 UT WOS:A1995RV65800015 ER PT J AU GALLAGHER, MC FYFIELD, MS COWIN, JP JOYCE, SA AF GALLAGHER, MC FYFIELD, MS COWIN, JP JOYCE, SA TI IMAGING INSULATING OXIDES - SCANNING-TUNNELING-MICROSCOPY OF ULTRATHIN MGO FILMS ON MO(001) SO SURFACE SCIENCE LA English DT Letter DE EPITAXY; INSULATING FILMS; LOW INDEX SINGLE CRYSTAL SURFACES; MAGNESIUM OXIDES; SCANNING TUNNELING MICROSCOPY; SURFACE STRUCTURE ID MO(100) AB Using scanning tunneling microscopy (STM) we have studied the structure of an insulating thin film, MgO grown on Mo(001). Although the bandgap in bulk MgO is 7.8 eV, the films are sufficiently conducting to perform STM. Stable tunneling and imaging can be obtained for MgO films up to 25 Angstrom thick. Growth at room temperature produces uniform films with small domains of between 20 and 60 Angstrom in diameter. The domains have random shapes with the perimeter of the domains exhibiting no preferred orientation. Films as thick as 8 layers typically have 3 atomic layers exposed. Films grown at temperatures in excess of 1000 K exhibited three-dimensional MgO islands with exposed substrate. Close inspection of these films determined that at voltages as low as 2.5 V and for films as thick as 5 ML the STM directly measures oxide film morphology. C1 PACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, RICHLAND, WA 99352 USA. PORTLAND STATE UNIV, ESR PHYS, PORTLAND, OR 97207 USA. RI Joyce, Stephen/Q-7804-2016 OI Joyce, Stephen/0000-0003-1330-7362 NR 11 TC 64 Z9 64 U1 3 U2 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD OCT 1 PY 1995 VL 339 IS 3 BP L909 EP L913 DI 10.1016/0039-6028(95)80056-5 PG 5 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA RV658 UT WOS:A1995RV65800003 ER PT J AU SADANA, A ALARIE, JP VO-DINH, T AF SADANA, A ALARIE, JP VO-DINH, T TI A BETA-CYCLODEXTRIN BASED FIBEROPTIC CHEMICAL SENSOR - A FRACTAL ANALYSIS SO TALANTA LA English DT Note DE BINDING RATE COEFFICIENT; CHEMICAL SENSOR; FRACTAL DIMENSION ID IMMOBILIZED ANTIBODY; EXTERNAL DIFFUSION; BINDING-KINETICS; ANTIGEN; SURFACES; PHASE; LIMITATIONS AB A fractal analysis is presented for the binding of pyrene in solution to beta-cyclodextrin attached to a fiber-optic chemical sensor. The specific (k(1)) and non-specific binding rate coefficients and the fractal dimension (D-f) (specific binding case only) both tend to increase as the pyrene concentration in solution increases from 12.4 to 124 ng ml(-1). Predictive relations for the binding rate coefficient (specific as well as non-specific binding) and for D-f (specific binding case only) as a function of pyrene concentration are provided. These relations fit the calculated k(1) and D-f values in the pyrene concentration range reasonably well. Fractal analysis data seem to indicate that an increase in the pyrene concentration in solution increases the ''ruggedness'' or inhomogeneity on the fiber-optic biosensor surface. The fractal analysis provides novel physical insights into the reactions occuring on the fiber-optic chemical surface and should assist in the design of fiber-optic chemical sensors. C1 OAK RIDGE NATL LAB, DIV HLTH SCI RES, OAK RIDGE, TN 37831 USA. UNIV MISSISSIPPI, DEPT CHEM ENGN, UNIVERSITY, MS 38677 USA. NR 37 TC 16 Z9 16 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-9140 J9 TALANTA JI Talanta PD OCT PY 1995 VL 42 IS 10 BP 1567 EP 1574 DI 10.1016/0039-9140(95)01607-D PG 8 WC Chemistry, Analytical SC Chemistry GA TH013 UT WOS:A1995TH01300029 PM 18966390 ER PT J AU STRECKER, MR FRISCH, W HAMBURGER, MW RATSCHBACHER, L SEMILETKIN, S SAMORUYEV, A STURCHIO, N AF STRECKER, MR FRISCH, W HAMBURGER, MW RATSCHBACHER, L SEMILETKIN, S SAMORUYEV, A STURCHIO, N TI QUATERNARY DEFORMATION IN THE EASTERN PAMIRS, TAJIKISTAN AND KYRGYZSTAN SO TECTONICS LA English DT Article ID MOMENT TENSOR SOLUTIONS; FAULT PLANE SOLUTIONS; SOVIET CENTRAL-ASIA; ACTIVE TECTONICS; TIEN-SHAN; SOUTHERN TIBET; EARTHQUAKES; SEISMICITY AB Active deformation in the eastern Pamir of Central Asia is concentrated on the margins of the orogen with minor deformation within the high terrain. Along the Trans-Alai mountain front at the northern perimeter of the orogen, Quaternary thrusting is documented by uplifted pediments, now at > 500 m above the piedmont, Holocene fault scarps, and large earthquakes with N to NW oriented P axes. Seismicity in the interior of the orogen outlines a N-S belt that includes normal faulting events with E-W oriented T axes. N-S striking, active normal faults in the interior Lake Karakul region are compatible with these earthquakes; they define an asymmetric graben with a master fault at the western basin margin. In the southern Pamirs, dextral strike-slip faults root in the dextral Karakorum Fault, which bounds the Pamirs to the east. A mixture of dextral and reverse offsets totalling 135 m in Pleistocene terraces and 8 m in late Pleistocene/Holocene deposits demonstrates contemporary transpression, indicating average displacement rates of < 1 mm/yr. The concentration of young thrusts along the Trans-Alai, the northward migration of thrusting, and the scarcity of other large-scale shortening features within the eastern Pamirs suggest that this part of the orogen moves northward en bloc and causes the progressive annihilation of the intermontane Alai Valley. Widespread dextral shear in the eastern Pamirs, both to the south and north of the extensional Karakul depression, and combined dextral strike-slip and normal faulting in the Muji-Tashgorgan graben of the Chinese Pamirs are interpreted as localized space accommodation phenomena, formed during progressive transfer of compressional deformation along a dextral strike-slip deformation zone with extensional stepovers. C1 STANFORD UNIV,DEPT GEOPHYS,STANFORD,CA 94305. UNIV TUBINGEN,INST GEOL,W-7400 TUBINGEN,GERMANY. INDIANA UNIV,DEPT GEOL,BLOOMINGTON,IN 47405. ALL RUSSIA GEOL RES INST,ST PETERSBURG,RUSSIA. ARGONNE NATL LABS,ARGONNE,IL. NR 57 TC 75 Z9 88 U1 1 U2 12 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0278-7407 J9 TECTONICS JI Tectonics PD OCT PY 1995 VL 14 IS 5 BP 1061 EP 1079 DI 10.1029/95TC00927 PG 19 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA RZ633 UT WOS:A1995RZ63300001 ER PT J AU SIEBENLIST, KR MEH, DA WALL, JS HAINFELD, JF MOSESSON, MW AF SIEBENLIST, KR MEH, DA WALL, JS HAINFELD, JF MOSESSON, MW TI ORIENTATION OF THE CARBOXY-TERMINAL REGIONS OF FIBRIN GAMMA-CHAIN DIMERS DETERMINED FROM THE CROSS-LINKED PRODUCTS FORMED IN MIXTURES OF FIBRIN, FRAGMENT-D, AND FACTOR-XIIIA SO THROMBOSIS AND HAEMOSTASIS LA English DT Article ID CROSS-LINKED FIBRIN; ELECTRON-MICROSCOPY; POLYMERIZATION SITES; IDENTIFICATION; DOMAINS; MOLECULES; POLYMERS; LINKING; MODEL AB There are two schools of thought regarding the orientation of the intermolecular epsilon-amino-(gamma-glutamyl) lysine isopeptide bonds formed between gamma chains in the D domains of assembled fibrin fibers. Some investigators believe that these bonds are oriented parallel to the direction of fiber growth (longitudinally) at the contacting ends of fibrin D domains ('DD-long'), whereas others believe that these bonds are oriented across the two-stranded fibril, between D domains in, opposing strands ('DD-transverse'). To distinguish between these two possibilities, the structure of crosslinked products formed in mixtures of fibrin, plasmic fragment D, and factor XIIIa were analyzed, based upon this rationale: Complex formation between D fragments and a fibrin template depends upon the non-covalent 'D:E' interaction between each fibrin E domain and two D fragments ('D:fibrin:D'). If carboxy-terminal gamma chains in the D:fibrin:D complex became aligned in a DD-long configuration, only crosslinked fragment D dimers ('D-D') will result and the fibrin 'template' will not become crosslinked to the associated D fragments, If instead, gamma chain crosslinks form transversely between the D fragments and fibrin, covalently linked D-fibrin complexes will result. SDS-PAGE of factor XIIIa crosslinked mixtures of fibrin and fragment D demonstrated products of a size and subunit composition indicating D-fibrin and D-fibrin-D formation. Small amounts of D dimers were also formed at the same levels as were formed in mixtures of fragment D and factor XIIIa alone. Electron microscopic images of D-fibrin-D complexes prepared under physiological buffer conditions demonstrated that the D fragments were associated with the central E domain of the fibrin molecule, but that they could be dissociated from this non-covalent association in 2% acetic acid. These findings indicate that gamma chain crosslinks occur transversely in D:fibrin:D complexes and permit the extrapolated conclusion that gamma chain crosslinks are also positioned transversely in an assembled fibrin polymer. C1 MARQUETTE UNIV,SCH DENT,DEPT VET BASIC SCI,MILWAUKEE,WI 53233. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RP SIEBENLIST, KR (reprint author), UNIV WISCONSIN,SCH MED,SINAI SAMARITAN MED CTR,836 N 12TH ST,MILWAUKEE,WI 53233, USA. FU NHLBI NIH HHS [HL-47000]; PHS HHS [R01-11777] NR 47 TC 20 Z9 20 U1 0 U2 0 PU F K SCHATTAUER VERLAG GMBH PI STUTTGART PA P O BOX 10 45 45, LENZHALDE 3, D-70040 STUTTGART, GERMANY SN 0340-6245 J9 THROMB HAEMOSTASIS JI Thromb. Haemost. PD OCT PY 1995 VL 74 IS 4 BP 1113 EP 1119 PG 7 WC Hematology; Peripheral Vascular Disease SC Hematology; Cardiovascular System & Cardiology GA TA951 UT WOS:A1995TA95100023 PM 8560422 ER PT J AU PETERS, JM WILEY, LM AF PETERS, JM WILEY, LM TI EVIDENCE THAT MURINE PREIMPLANTATION EMBRYOS EXPRESS ARYL-HYDROCARBON RECEPTOR SO TOXICOLOGY AND APPLIED PHARMACOLOGY LA English DT Article ID AH-RECEPTOR; GENE; 2,3,7,8-TETRACHLORODIBENZO-PARA-DIOXIN; TOXICITY; INVITRO; RNA AB The underlying mechanism of 2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD)-induced alterations during development is thought to be mediated by a cytosolic aryl hydrocarbon receptor (Ahr). The specific role of Ahr-mediated changes in gene expression during embryonic development has not been elucidated, Recently, we reported that TCDD directly affects preimplantation embryo development in vitro, by accelerating differentiation of the blastocyst. In the work reported here, we provide evidence which suggests that Ahr mRNA and protein are present in mouse preimplantation embryos, Our results suggest that the embryo transcribes, rather than maternally- inherits Ahr mRNA, In addition, culturing embryos in medium with an Ahr antisense oligodeoxynucleotide resulted in a significantly lower incidence of blastocyst formation as well as mean embryo cell number, Results from this work suggest that Ahr may function in embryonic cell differentiation and proliferation independent of its known function in mediating TCDD toxicity in other systems. (C) 1995 Academic Press, Inc. RP PETERS, JM (reprint author), LAWRENCE LIVERMORE NATL LAB,INST TOXICOL & ENVIRONM HLTH,DEPT OBSTET & GYNECOL,DAVIS,CA 95616, USA. RI Peters, Jeffrey/D-8847-2011 FU NIEHS NIH HHS [ES03575, ES05409, ES05707] NR 23 TC 48 Z9 49 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0041-008X J9 TOXICOL APPL PHARM JI Toxicol. Appl. Pharmacol. PD OCT PY 1995 VL 134 IS 2 BP 214 EP 221 DI 10.1006/taap.1995.1186 PG 8 WC Pharmacology & Pharmacy; Toxicology SC Pharmacology & Pharmacy; Toxicology GA RY722 UT WOS:A1995RY72200004 PM 7570597 ER PT J AU STOCKSTILL, BL CHANG, LY MENACHE, MG MELLICK, PW MERCER, RR CRAPO, JD AF STOCKSTILL, BL CHANG, LY MENACHE, MG MELLICK, PW MERCER, RR CRAPO, JD TI BRONCHIOLARIZED METAPLASIA AND INTERSTITIAL FIBROSIS IN RAT LUNGS CHRONICALLY EXPOSED TO HIGH AMBIENT LEVELS OF OZONE SO TOXICOLOGY AND APPLIED PHARMACOLOGY LA English DT Article ID TRANSFORMING GROWTH-FACTOR; PROXIMAL ALVEOLAR REGION; EPITHELIAL-CELLS; EXTRACELLULAR-MATRIX; FACTOR-BETA; ADULT-RATS; PULMONARY FIBROSIS; BASEMENT-MEMBRANE; TYPE-2 CELLS; CLARA CELLS AB The cellular and tissue changes in the lungs of rats were studied using electron microscopy following 20 months exposure to a range of ozone levels from 0.12 to 1.0 ppm. Male and female Fischer 344 rats were exposed and morphometric methods were used to determine the volume, surface area, and cellular changes observed in bronchiole-alveolar duct regions following chronic ozone exposure. No major gender-related effects were observed in response to chronic inhalation of ozone nor were significant effects of ozone exposure found in either terminal bronchioles or the proximal alveolar regions in animals chronically exposed to 0.12 ppm ozone. The proximal alveolar regions of animals exposed for 20 months to 0.5 and 1.0 ppm ozone were significantly altered with exposure. The high-dose, long-term exposure to ozone resulted in a pronounced increase in volume of both the interstitium and epithelium in the proximal alveolar regions. The thickening of the epithelium was due to a change in tissue type from the normal squamous epithelium to a cuboidal epithelium similar, but not identical, to that found in terminal bronchioles. This bronchiolar epithelial metaplasia of proximal alveolar ducts, which was dose related, was composed of differentiated ciliated and Clara cells similar to those found in terminal bronchioles. In addition, unique cells which contained morphologic features of many different cell types were observed. These cells, which may represent stem cells or differentiated but transformed cells, were found associated with the bronchiolar metaplasia of alveolar ducts. In conjunction with the epithelial changes, cellular and matrix components in the interstitium were increased with chronic exposure to 0.5 and 1.0 ppm ozone. All matrix components were increased including collagen, elastin, and basement membrane, as well as other acellular spaces which did not contain identifiable structures. The total volume of interstitial fibroblasts was also increased in the high-dose exposure group, Alveolar macrophages were increased only in the 1.0 ppm exposed animals. The cell and tissue changes in the terminal bronchioles were less pronounced indicating a relative resistance of this tissue to ozone and mainly consisted of a change in cell type from ciliated to Clara cells in the 1.0 ppm exposed animals. The relative resistance of bronchiolar tissue to high concentration ozone exposure and the extensive bronchiolar epithelial metaplasia seen in the alveolar ducts suggest that bronchiolar metaplasia may be an adaptive mechanism following chronic ozone exposure. The bronchiolar epithelial metaplasia and interstitial fibrosis seen with high-dose chronic ozone exposure are similar to, and may be a model for, the early steps in human fibrotic diseases such as idiopathic pulmonary fibrosis, (C) 1995 Academic Press, Inc. C1 DUKE UNIV, MED CTR, DEPT PATHOL, DURHAM, NC 27710 USA. DUKE UNIV, MED CTR, CTR EXTRAPOLAT MODELING, DURHAM, NC 27710 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP STOCKSTILL, BL (reprint author), DUKE UNIV, MED CTR, DEPT MED, DURHAM, NC 27710 USA. NR 50 TC 17 Z9 17 U1 1 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0041-008X J9 TOXICOL APPL PHARM JI Toxicol. Appl. Pharmacol. PD OCT PY 1995 VL 134 IS 2 BP 251 EP 263 DI 10.1006/taap.1995.1191 PG 13 WC Pharmacology & Pharmacy; Toxicology SC Pharmacology & Pharmacy; Toxicology GA RY722 UT WOS:A1995RY72200009 PM 7570602 ER PT J AU HSUEH, CH AF HSUEH, CH TI MODELING OF ELASTIC STRESS TRANSFER IN FIBER-REINFORCED COMPOSITES SO TRENDS IN POLYMER SCIENCE LA English DT Article ID PULL-OUT STRESSES; POLYDIACETYLENE EPOXY COMPOSITES; RAMAN-SPECTROSCOPY; CERAMIC COMPOSITES; MATRIX COMPOSITES; BOND STRENGTH; FRACTURE; MODULUS; TESTS AB Stress transfer in fiber-reinforced composites plays an important role in determining the mechanical properties of composites. The shear lag model has been used extensively to analyze this stress transfer. To achieve analytical solutions, various simplifications have been adopted in the stress analysis. Questions regarding the adequacy of those simplifications are discussed in this review for two cases: bonded interfaces and frictional interfaces. Specifically, simplifications regarding Poisson's effect and the radial dependencies of axial stresses in the fiber and the matrix are addressed. The results obtained from analyses with various simplifications are compared. Also, in the case of an embedded fiber, stress transfer occurs at both the interface along the fiber length and the ends of the fiber. However, the boundary condition at the bonded ends is ambiguous. The techniques for resolving this ambiguity are reviewed. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RI Hsueh, Chun-Hway/G-1345-2011 NR 41 TC 6 Z9 6 U1 0 U2 2 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0966-4793 J9 TRENDS POLYM SCI JI Trends Polym. Sci. PD OCT PY 1995 VL 3 IS 10 BP 336 EP 341 PG 6 WC Polymer Science SC Polymer Science GA TB062 UT WOS:A1995TB06200005 ER PT J AU MCEWEN, BF DOWNING, KH GLAESER, RM AF MCEWEN, BF DOWNING, KH GLAESER, RM TI THE RELEVANCE OF DOSE-FRACTIONATION IN TOMOGRAPHY OF RADIATION-SENSITIVE SPECIMENS SO ULTRAMICROSCOPY LA English DT Article ID ELECTRON-MICROSCOPIC TOMOGRAPHY; RECONSTRUCTION AB It is commonly assumed that the number of projections required for single-axis tomography precludes its application to most beam-labile specimens. However, Hegerl and Hoppe have pointed out that the total dose required to achieve statistical significance for each voxel of a computed 3D reconstruction is the same as that required to obtain a single 2D image of that isolated voxel, at the same level of statistical significance. Thus a statistically significant 3D image can be computed from statistically insignificant projections, as long as the total dose that is distributed among these projections is high enough that it would have resulted in a statistically significant projection, if applied to only one image. We have tested this critical theorem by simulating the tomographic reconstruction of a realistic 3D model created from an electron micrograph. The simulations verify the basic conclusions of the theorem and extend its validity to the experimentally more realistic conditions of high absorption, signal-dependent noise, varying specimen contrast and missing angular range. Individual projections in the series of fractionated-dose images could be aligned by cross-correlation because they contained significant information derived from the summation of features from different depths in the structure. This latter information is generally not useful for structural interpretation prior to 3D reconstruction, owing to the complexity of most specimens investigated by single-axis tomography. These results demonstrate that it is feasible to use single-axis tomography with soft X-ray and electron microscopy of frozen-hydrated specimens. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LABS,DIV LIFE SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. RP MCEWEN, BF (reprint author), NEW YORK STATE DEPT HLTH,WADSWORTH CTR,DIV MOLEC MED,CELL REGULAT LAB,EMPIRE STATE PLAZA,POB 509,ALBANY,NY 12201, USA. FU NCRR NIH HHS [RR01219] NR 28 TC 98 Z9 99 U1 0 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD OCT PY 1995 VL 60 IS 3 BP 357 EP 373 DI 10.1016/0304-3991(95)00082-8 PG 17 WC Microscopy SC Microscopy GA TK654 UT WOS:A1995TK65400003 PM 8525549 ER PT J AU MUFTIKIAN, R FERNANDO, Q KORTE, N AF MUFTIKIAN, R FERNANDO, Q KORTE, N TI A METHOD FOR THE RAPID DECHLORINATION OF LOW-MOLECULAR-WEIGHT CHLORINATED HYDROCARBONS IN WATER SO WATER RESEARCH LA English DT Note DE CHLORINATED HYDROCARBONS; TCE (1,1,2-TRICHLOROETHYLENE); 1,1-DICHLOROETHYLENE; 1,2-DICHLOROETHYLENES; TETRACHLOROETHYLENE; CARBON TETRACHLORIDE; CHLOROFORM; DICHLOROMETHANE; DECHLORINATION; HYDRODECHLORINATION; IRON; BIMETALLIC SYSTEMS ID ULTRAVIOLET-RADIATION; OZONE AB 1,1,2-Trichloroethylene (TCE), 1,1-dichloroethylene, cis and trans-1,2-dichloroethylene and tetrachloroethylene (PCE), at concentrations of 20 ppm in aqueous solutions were rapidly hydrodechlorinated to ethane (in a few minutes), on the surface of palladized iron in batch experiments that were performed in closed vials. No intermediate reaction products such as 1,1-dichloroethylene, 1,2-dichloroethylenes and vinyl chloride were detected at concentrations >1 ppm either in the headspace or in solution. The chloromethanes, CCl4, CHCl3, and CH2Cl2, were also dechlorinated to methane on palladized iron; the CCl4 was dechlorinated in a few minutes, the CHCl3, in less than an hour and the CH2Cl2, in 4-5 h. These results indicate that an above-ground treatment method can be designed for the treatment of groundwater contaminated with low molecular weight chlorinated hydrocarbons. C1 UNIV ARIZONA,DEPT CHEM,TUCSON,AZ 85721. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,GRAND JUNCTION,CO 81503. NR 15 TC 203 Z9 236 U1 3 U2 43 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0043-1354 J9 WATER RES JI Water Res. PD OCT PY 1995 VL 29 IS 10 BP 2434 EP 2439 DI 10.1016/0043-1354(95)00102-Q PG 6 WC Engineering, Environmental; Environmental Sciences; Water Resources SC Engineering; Environmental Sciences & Ecology; Water Resources GA RM775 UT WOS:A1995RM77500027 ER PT J AU DOGAN, ON HAWK, JA AF DOGAN, ON HAWK, JA TI EFFECT OF CARBIDE ORIENTATION ON ABRASION OF HIGH CR WHITE CAST-IRON SO WEAR LA English DT Article DE ABRASION RESISTANCE; WHITE CAST IRON; CHROMIUM CARBIDES ID WEAR AB Wear resistant, high chromium white cast irons contain high volume fractions of M(7)C(3) type carbides, which grow as rods and blades during solidification to produce a highly anisotropic microstructure. In this study, the effect of carbide orientation on the wear properties of these alloys is examined using both a high-stress pin-on-drum abrasion test and a single scratch test. It is found that when the carbides are oriented with their long axes perpendicular to the wear surface, abrasion resistance is considerably reduced. When the long axes of the carbides are parallel to the wear surface, the cast irons are more wear resistant, and the alloys show the least wear when the long axes of the carbides are parallel to the wear surface and oriented perpendicular to the wear direction. Scanning electron microscopy reveals that fracture of the carbides depends upon the orientation of the carbides with respect to the wear surface and the wear direction. RP DOGAN, ON (reprint author), US BUR MINES,ALBANY RES CTR,ALBANY,OR 97321, USA. NR 10 TC 64 Z9 66 U1 1 U2 6 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0043-1648 J9 WEAR JI Wear PD OCT PY 1995 VL 189 IS 1-2 BP 136 EP 142 DI 10.1016/0043-1648(95)06682-9 PG 7 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA TH448 UT WOS:A1995TH44800017 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E AJINENKO, I ALEKSAN, R ALEKSEEV, GD ALLPORT, PP ALMEHED, S ALVSVAAG, SJ AMALDI, U AMATO, S ANDREAZZA, A ANDRIEUX, ML ANTILOGUS, P APEL, WD ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BAUDOT, J BECKS, KH BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BLOCH, D BLUME, M BLYTH, S BOCCI, V BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRANCHINI, P BRAND, KD BRENNER, RA BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM BUGGE, L BURAN, T BUYS, A CACCIA, M CALVI, M ROZAS, AJC CAMPORESI, T CANALE, V CANEPA, M CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHIERICI, R CHLIAPNIKOV, P CHOCHULA, P CHOROWICZ, V CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COSSUTTI, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUM, A DAUNCEY, PD DAVENPORT, M DASILVA, W DEFOIX, C DELLARICCA, G DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DESAINTJEAN, C DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DREES, KA DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EHRET, R EIGEN, G EKELOF, T EKSPONG, G ELSING, M ENGEL, JP ERSHAIDAT, N ERZEN, B SANTO, ME FALK, E FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORMENTI, F FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GALLONI, A GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GELE, D GERBER, JP GERDYUKOV, L GIBBS, M GILLESPIE, D GOKIELI, R GOLOB, B GOPAL, G GORN, L GORSKI, M GOUZ, Y GRACCO, V GRAZIANI, E GROSDIDIER, G GUNNARSSON, P GUNTHER, M GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAJDUK, Z HALLGREN, A HAMACHER, K HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIGON, E HILKE, HJ HILL, TS HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K JOANNOU, P JACKSON, JN JACOBSSON, R JALOCHA, P JANIK, R JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONSSON, L JONSSON, P JORAM, C JUILLOT, P KAISER, M KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, K KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUMSTEIN, Z KRUPINSKI, W KUBINEC, P KUCEWICZ, W KURVINEN, K LACASTA, C LAKTINEH, I LAMBLOT, S LAMSA, JW LANCERI, L LANE, DW LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEFEBURE, V LEGAN, CK LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LIKO, D LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOPEZ, JM LOPEZFERNANDEZ, A AGUERA, MAL LOUKAS, D LUTZ, P LYONS, L MACNAUGHTON, J MAEHLUM, G MAIO, A MALYCHEV, V MARCO, J MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTINEZRIVERO, C MARTINEZVIDAL, F GARCIA, SM MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIRABITO, L MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MUNDIM, L MITAROFF, WA MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NAVAS, S NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NIEUWENHUIZEN, M NIKOLAENKO, V NISS, P NOMEROTSKI, A NORMAND, A OBERSCHULTEBECKMANN, W OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAGES, P PALKA, H PAPADOPOULOU, TD PAPE, L PARKES, C PARODI, F PASSERI, A PEGORARO, M PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PHILLIPS, HT PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PUKHAEVA, N PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G RIPP, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONJIN, V ROOS, L ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SADOVSKY, A SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEDYKH, Y SEGAR, AM SEITZ, A SEKULIN, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SITAR, B SKAALI, TB SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVITSKI, I STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAUSS, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M TABARELLI, T TAVERNET, JP TCHIKILEV, O TILQUIN, A TIMMERMANS, J TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORTORA, L TRANSTROMER, G TREILLE, D TRISCHUK, W TRISTRAM, G TROMBINI, A TRONCON, C TSIROU, A TURLUER, ML TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E VELDE, CV VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VANELDIK, J VASSILOPOULOS, N VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VRBA, V WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKE, D WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YIP, K YUSHCHENKO, O ZACH, F ZACHARATOU, C ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUCCHELLI, GC ZUMERLE, G AF ABREU, P ADAM, W ADYE, T AGASI, E AJINENKO, I ALEKSAN, R ALEKSEEV, GD ALLPORT, PP ALMEHED, S ALVSVAAG, SJ AMALDI, U AMATO, S ANDREAZZA, A ANDRIEUX, ML ANTILOGUS, P APEL, WD ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BAUDOT, J BECKS, KH BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BLOCH, D BLUME, M BLYTH, S BOCCI, V BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRANCHINI, P BRAND, KD BRENNER, RA BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM BUGGE, L BURAN, T BUYS, A CACCIA, M CALVI, M ROZAS, AJC CAMPORESI, T CANALE, V CANEPA, M CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHIERICI, R CHLIAPNIKOV, P CHOCHULA, P CHOROWICZ, V CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COSSUTTI, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUM, A DAUNCEY, PD DAVENPORT, M DASILVA, W DEFOIX, C DELLARICCA, G DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DESAINTJEAN, C DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DREES, KA DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EHRET, R EIGEN, G EKELOF, T EKSPONG, G ELSING, M ENGEL, JP ERSHAIDAT, N ERZEN, B SANTO, ME FALK, E FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORMENTI, F FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GALLONI, A GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GELE, D GERBER, JP GERDYUKOV, L GIBBS, M GILLESPIE, D GOKIELI, R GOLOB, B GOPAL, G GORN, L GORSKI, M GOUZ, Y GRACCO, V GRAZIANI, E GROSDIDIER, G GUNNARSSON, P GUNTHER, M GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAJDUK, Z HALLGREN, A HAMACHER, K HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIGON, E HILKE, HJ HILL, TS HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K JOANNOU, P JACKSON, JN JACOBSSON, R JALOCHA, P JANIK, R JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONSSON, L JONSSON, P JORAM, C JUILLOT, P KAISER, M KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, K KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUMSTEIN, Z KRUPINSKI, W KUBINEC, P KUCEWICZ, W KURVINEN, K LACASTA, C LAKTINEH, I LAMBLOT, S LAMSA, JW LANCERI, L LANE, DW LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEFEBURE, V LEGAN, CK LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LIKO, D LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOPEZ, JM LOPEZFERNANDEZ, A AGUERA, MAL LOUKAS, D LUTZ, P LYONS, L MACNAUGHTON, J MAEHLUM, G MAIO, A MALYCHEV, V MARCO, J MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTINEZRIVERO, C MARTINEZVIDAL, F GARCIA, SM MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIRABITO, L MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MUNDIM, L MITAROFF, WA MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NAVAS, S NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NIEUWENHUIZEN, M NIKOLAENKO, V NISS, P NOMEROTSKI, A NORMAND, A OBERSCHULTEBECKMANN, W OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAGES, P PALKA, H PAPADOPOULOU, TD PAPE, L PARKES, C PARODI, F PASSERI, A PEGORARO, M PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PHILLIPS, HT PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PUKHAEVA, N PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G RIPP, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONJIN, V ROOS, L ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SADOVSKY, A SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEDYKH, Y SEGAR, AM SEITZ, A SEKULIN, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SITAR, B SKAALI, TB SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVITSKI, I STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAUSS, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M TABARELLI, T TAVERNET, JP TCHIKILEV, O TILQUIN, A TIMMERMANS, J TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORTORA, L TRANSTROMER, G TREILLE, D TRISCHUK, W TRISTRAM, G TROMBINI, A TRONCON, C TSIROU, A TURLUER, ML TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E VELDE, CV VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VANELDIK, J VASSILOPOULOS, N VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VRBA, V WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKE, D WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YIP, K YUSHCHENKO, O ZACH, F ZACHARATOU, C ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUCCHELLI, GC ZUMERLE, G TI B-ASTERISK PRODUCTION IN Z-DECAYS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID STAR CROSS-SECTION; MESONS AB The decay B* --> B gamma has been observed with the DELPHI detector at LEP, where the B* meson is produced in Z boson decays, The combination of inclusively reconstructed B mesons with well-measured converted photons yields a measurement of the flavour-averaged B* - B mass difference of 45.5 +/- 0.3 (stat.) +/- 0.8 (syst.) MeV/c(2). 95% confidence level upper limits at 6 MeV/c(2) are placed on both the isospin (i.e, B+-B-0) and the B-s-B-ud splitting of the mass difference, The production ratio of B* to B mesons in Z decays is measured to be 0.72 +/- 0.03 (stat.) +/- 0.06 (syst.). Limits on the production cross-section of other hypothetical excited B hadron states decaying radiatively are established. The differential B* cross section has been measured to be in good agreement with the average b fragmentation, yielding an average fractional B* energy of [x(E)] = 0.695 +/- 0.009 (stat.) +/- 0.013 (syst.). From the decay angular distribution the relative contribution of longitudinal B* polarisation states is measured to be sigma(L)/(sigma(L) + sigma(T)) = 0.32 +/- 0.04 (stat.) +/- 0.03 (syst.). C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. FREE UNIV BRUSSELS,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BOLOGNA,DIPARTMENTO FIS,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. PONTIFICIA UNIV CATOLICA RIO DE JANEIRO,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. UNIV ESTADUAL RIO JANEIRO,INST FIS,RIO JANEIRO,BRAZIL. COMENIUS UNIV BRATISLAVA,FAC MATH & PHYS,BRATISLAVA 84215,SLOVAKIA. COLL FRANCE,PHYS CORPUSCULAIRE LAB,CNRS,IN2P3,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV STRASBOURG 1,CNRS,IN2P3,CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. ACAD SCI CZECH REPUBL,INST PHYS,FZU,DIV HIGH ENERGY PHYS,CR-18040 PRAGUE 8,CZECH REPUBLIC. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. IST NAZL FIS NUCL,I-16146 GENOA,ITALY. UNIV GRENOBLE 1,CNRS,IN2P3,INST SCI NUCL,F-38026 GRENOBLE,FRANCE. SEFT,HIGH ENERGY PHYS RES INST,SF-00014 HELSINKI,FINLAND. JOINT NUCL RES INST,DUBNA 101000,RUSSIA. UNIV KARLSRUHE,INST EXPTL KERNPHYS,D-76128 KARLSRUHE,GERMANY. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. UNIV PARIS 11,LAB ACCELERATEUR LINEAIRE,IN2P3,CNRS,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. INST SUPER TECN,LIP,FCUL,P-1000 LISBON,PORTUGAL. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,MERSEYSIDE,ENGLAND. UNIV PARIS 06,LPNHE,IN2P3,CNRS,F-75252 PARIS 05,FRANCE. UNIV PARIS 07,F-75252 PARIS 05,FRANCE. LUND UNIV,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV LYON 1,IPNL,IN2P3,CNRS,F-69622 VILLEURBANNE,FRANCE. UNIV COMPLUTENSE MADRID,E-28040 MADRID,SPAIN. UNIV AIX MARSEILLE 2,CPP,IN2P3,CNRS,F-13288 MARSEILLE 09,FRANCE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN O,DENMARK. CHARLES UNIV,MFF NUCL CTR,CR-18000 PRAGUE 8,CZECH REPUBLIC. NIKHEF H,1009 DB AMSTERDAM,NETHERLANDS. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV OVIEDO,DEPT FIS,E-33006 OVIEDO,SPAIN. UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. IST NAZL FIS NUCL,I-35131 PADUA,ITALY. RUTHERFORD APPLETON LAB,CHILTON OX11 0QX,ENGLAND. UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY. IST NAZL FIS NUCL,I-00173 ROME,ITALY. CENS,DSM,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. IST NAZL FIS NUCL,IST SUPER SANITA,I-00161 ROME,ITALY. UNIV CANTABRIA,CSIC,CEAFM,E-39006 SANTANDER,SPAIN. INST HIGH ENERGY PHYS,PROTVINO,RUSSIA. UNIV LJUBLJANA,JOZEF STEFAN INST,LJUBLJANA 61000,SLOVENIA. UNIV LJUBLJANA,DEPT PHYS,LJUBLJANA 61000,SLOVENIA. UNIV STOCKHOLM,S-11385 STOCKHOLM,SWEDEN. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. IST NAZL FIS NUCL,I-10125 TURIN,ITALY. UNIV TRIESTE,DIPARTMENTO FIS,I-34127 TRIESTE,ITALY. IST NAZL FIS NUCL,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. UNIV FED RIO DE JANEIRO,BR-21945970 RIO JANEIRO,BRAZIL. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV VALENCIA,CSIC,IFIC,E-46100 BURJASSOT,SPAIN. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. UNIV WARSAW,INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,D-42097 WUPPERTAL 1,GERMANY. RP ABREU, P (reprint author), INST SUPER TECN,FCUL,LIP,AV ELIAS GARCIA 14-1,P-1000 LISBON,PORTUGAL. RI Hallgren, Allan/A-8963-2013; Botner, Olga/A-9110-2013; Mundim, Luiz/A-1291-2012; Zalewski, Piotr/H-7335-2013; Marti-Garcia, Salvador/F-3085-2011; Monge, Maria Roberta/G-9127-2012; Nemecek, Stanislav/G-5931-2014; Ridky, Jan/H-6184-2014; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Espirito Santo, Maria Catarina/L-2341-2014; Pimenta, Mario/M-1741-2013; gandelman, miriam/N-3739-2014; Ragazzi, Stefano/D-2463-2009; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Smirnova, Oxana/A-4401-2013; Della Ricca, Giuseppe/B-6826-2013; Olshevskiy, Alexander/I-1580-2016; Rames, Jiri/H-2450-2014; Paganoni, Marco/A-4235-2016; Contreras Gonzalez, Jose Luis/K-7255-2014; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Navas, Sergio/N-4649-2014; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; Nomerotski, Andrei/A-5169-2010; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Krammer, Manfred/A-6508-2010; De Saint Jean, Cyrille/E-8853-2011; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Fruhwirth, Rudolf/H-2529-2012; Andreazza, Attilio/E-5642-2011; Verlato, Marco/J-4604-2012; Dracos, Marcos/K-2335-2012 OI Mundim, Luiz/0000-0001-9964-7805; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Tome, Bernardo/0000-0002-7564-8392; Espirito Santo, Maria Catarina/0000-0003-1286-7288; Pimenta, Mario/0000-0002-2590-0908; Ragazzi, Stefano/0000-0001-8219-2074; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Smirnova, Oxana/0000-0003-2517-531X; Della Ricca, Giuseppe/0000-0003-2831-6982; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Navas, Sergio/0000-0003-1688-5758; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Ruiz, Alberto/0000-0002-3639-0368; Krammer, Manfred/0000-0003-2257-7751; Shellard, Ronald/0000-0002-2983-1815; Petrolini, Alessandro/0000-0003-0222-7594; Andreazza, Attilio/0000-0001-5161-5759; Verlato, Marco/0000-0003-1967-7655; Dracos, Marcos/0000-0003-0514-193X NR 23 TC 44 Z9 44 U1 0 U2 6 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. 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CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHIERICI, R CHLIAPNIKOV, P CHOCHULA, P CHOROWICZ, V CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COSSUTTI, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUM, A DAUNCEY, PD DAVENPORT, M DASILVA, W DEFOIX, C DELLARICCA, G DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DESAINTJEAN, C DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DREES, KA DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EHRET, R EIGEN, G EKELOF, T EKSPONG, G ELSING, M ENGEL, JP ERSHAIDAT, N ERZEN, B SANTO, ME FALK, E FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FISCHER, PA FOETH, H FOKITIS, E FONTANELLI, F FORMENTI, F FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GALLONI, A GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GELE, D GERBER, JP GIBBS, M GILLESPIE, D GOKIELI, R GOLOB, B GOPAL, G GORN, L GORSKI, M GOUZ, Y GRACCO, V GRAZIANI, E GROSDIDIER, G GUNNARSSON, P GUNTHER, M GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAJDUK, Z HALLGREN, A HAMACHER, K HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIGON, E HILKE, HJ HILL, TS HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P JACKSON, JN JACOBSSON, R JALOCHA, P JANIK, R JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONSSON, L JONSSON, P JORAM, C JUILLOT, P KAISER, M KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, K 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BRENNER, RA BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM BUGGE, L BURAN, T BUYS, A CACCIA, M CALVI, M ROZAS, AJC CAMPORESI, T CANALE, V CANEPA, M CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHIERICI, R CHLIAPNIKOV, P CHOCHULA, P CHOROWICZ, V CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COSSUTTI, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUM, A DAUNCEY, PD DAVENPORT, M DASILVA, W DEFOIX, C DELLARICCA, G DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DESAINTJEAN, C DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DREES, KA DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EHRET, R EIGEN, G EKELOF, T EKSPONG, G ELSING, M ENGEL, JP 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KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, K KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUMSTEIN, Z KRUPINSKI, W KUBINEC, P KUCEWICZ, W KURVINEN, K LACASTA, C LAKTINEH, I LAMBLOT, S LAMSA, JW LANCERI, L LANE, DW LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEFEBURE, V LEGAN, CK LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LIKO, D LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOUKAS, D LUTZ, P LYONS, L MACNAUGHTON, J MAEHLUM, G MAIO, A MALYCHEV, V MANDL, F MARCO, J MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTINEZVIDAL, F GARCIA, SMI MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIRABITO, L MITAROFF, WA MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MUNDIM, LM MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NAVAS, S NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NIEUWENHUIZEN, M NIKOLAENKO, V NISS, P NOMEROTSKI, A NORMAND, A OBERSCHULTEBECKMANN, W OBRAZTSOV, V OLSHEVSKI, AG ONOFRE, A ORAVA, R OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAGES, P PALKA, H PAPADOPOULOU, TD PAPE, L PARKES, C PARODI, F PASSERI, A PEGORARO, M PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PHILIPS, HT PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PUKHAEVA, N PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G RIPP, I ROMERO, A RONCAGLIOLO, I RONCHESE, P ROOS, L ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SADOVSKY, A SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEDYKH, Y SEGAR, AM SEITZ, A SEKULIN, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SITAR, B SKAALI, TB SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVITSKI, I STEPANIAK, K STICHELBAUT, F STOCCHI, A STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M TABARELLI, T TAVERNET, JP TCHIKILEV, O TILQUIN, A TIMMERMANS, J TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORTORA, L TRANSTROMER, G TREILLE, D TRISCHUK, W TRISTRAM, G TROMBINI, A TRONCON, C TSIROU, A TURLUER, ML TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E VELDE, CV VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VANELDIK, J VASSILOPOULOS, N VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VRBA, V WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKE, D WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WOSCHNAGG, K YIP, K YUSHCHENKO, O ZACH, F ZACHARATOU, C ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHIGUNOV, V ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUCCHELLI, GC ZUMERLE, G TI LIFETIME OF CHARGED AND NEUTRAL B-HADRONS USING EVENT TOPOLOGY SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID LUND MONTE-CARLO; JET FRAGMENTATION; E+E-PHYSICS AB The lifetimes of charged and neutral B hadrons have been measured using data collected by the DELPHI experiment at LEP between 1991 and 1993, B hadrons are tagged as jets with a secondary vertex and the charge of the B candidate is taken to be the sum of the charges of the particles in the secondary vertex. Approximately 1,434,000 multihadronic Z(0) decays yielded 1817 B hadron candidates. The B purity was estimated to be around 99.1 +/- 0.3%, and 83% (70%) of the events measured as neutral (charged) came from neutral (charged) B's, The mean lifetimes of charged and neutral B hadrons were found to be 1.72 +/- 0.08 (stat.) +/- 0.06 (syst.) ps and 1.58 +/- 0.11 (stat.) +/- 0.09 (syst.) ps respectively. The ratio of their lifetimes, tau((charged))/tau((neutral)), was 1.09(-0.10)(+0.11) (stat.)+/-0.08 (syst.). By making assumptions about the B-s(0) and Lambda(b)(0) states, the B+ and B-0 meson life-times were determined to be tau(B)+ = 1.72 +/- 0.08 (stat.) +/- 0.06 (syst.) ps and tau(B)0 = 1.63 +/- 0.14 (stat.) +/- 0.13 (syst.) ps and the ratio of their lifetimes was: tau(B)+/tau(B)0 = 1.06(-0.11)(+0.13) +/- 0.10. The mean B lifetime was also deduced to be = 1.64 +/- 0.06 (stat.) +/- 0.04 (syst.) ps. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. FREE UNIV BRUSSELS,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BOLOGNA,DIPARTMENTO FIS,I-40126 BOLOGNA,ITALY. UNIV BOLOGNA,IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. PONTIFICIA UNIV CATOLICA RIO DE JANEIRO,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. UNIV ESTADUAL RIO DE JANEIRO,INST FIS,RIO JANEIRO,BRAZIL. COMENIUS UNIV BRATISLAVA,FAC MATH & PHYS,BRATISLAVA 84215,SLOVAKIA. COLL FRANCE,PHYS CORPUSCULAIRE LAB,CNRS,IN2P3,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV STRASBOURG 1,CTR RECH NUCL,IN2P3,CNRS,F-67037 STRASBOURG,FRANCE. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. ACAD SCI CZECH REPUBL,INST PHYS,FZU,DIV HIGH ENERGY PHYS,CR-11840 PRAGUE 8,CZECH REPUBLIC. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. IST NAZL FIS NUCL,I-16146 GENOA,ITALY. UNIV GRENOBLE 1,INST SCI NUCL,IN2P3,CNRS,F-38026 ST MARTIN DHERES,FRANCE. SEFT,HIGH ENERGY PHYS RES INST,SF-00014 HELSINKI,FINLAND. JOINT INST NUCL RES,MOSCOW 101000,RUSSIA. UNIV KARLSRUHE,INST EXPTL KERNPHYS,D-76128 KARLSRUHE,GERMANY. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,CNRS,IN2P3,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. INST SUPER TECN,FCUL,LIP,P-1000 LISBON,PORTUGAL. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,MERSEYSIDE,ENGLAND. UNIV PARIS 06,LPNHE,IN2P3,CNRS,F-75252 PARIS 05,FRANCE. UNIV PARIS 07,F-75252 PARIS 05,FRANCE. LUND UNIV,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV LYON 1,IPNL,IN2P3,CNRS,F-69622 VILLEURBANNE,FRANCE. UNIV COMPLUTENSE MADRID,E-13288 MADRID,SPAIN. UNIV AIX MARSEILLE 2,CPP,IN2P3,CNRS,F-13288 MARSEILLE 09,FRANCE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN O,DENMARK. CHARLES UNIV,MFF,CTR NUCL,CR-18000 PRAGUE 8,CZECH REPUBLIC. NIKHEF H,1009 DB AMSTERDAM,NETHERLANDS. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV OVIEDO,DEPT FIS,E-33006 OVIEDO,SPAIN. UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. IST NAZL FIS NUCL,I-35131 PADUA,ITALY. RUTHERFORD APPLETON LAB,CHILTON OX11 0QX,ENGLAND. UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY. IST NAZL FIS NUCL,I-00173 ROME,ITALY. CTR ETUD SACLAY,DSM,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. IST NAZL FIS NUCL,IST SUPER SANITA,I-00161 ROME,ITALY. UNIV CANTABRIA,CSIC,CEAFM,E-39006 SANTANDER,SPAIN. INST HIGH ENERGY PHYS,PROTVINO,RUSSIA. UNIV LJUBLJANA,JOZEF STEFAN INST,LJUBLJANA 61000,SLOVENIA. UNIV LJUBLJANA,DEPT PHYS,LJUBLJANA 61000,SLOVENIA. UNIV STOCKHOLM,FYSIKUM,S-11385 STOCKHOLM,SWEDEN. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. IST NAZL FIS NUCL,I-10125 TURIN,ITALY. UNIV TRIESTE,DIPARTMENTO FIS,I-34127 TRIESTE,ITALY. IST NAZL FIS NUCL,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. FED UNIV RIO DE JANEIRO,BR-21945970 RIO JANEIRO,BRAZIL. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV VALENCIA,CSIC,IFIC,E-46100 BURJASSOT,SPAIN. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV WARSAW,PL-00681 WARSAW,POLAND. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,D-42097 WUPPERTAL 1,GERMANY. RP ADAM, W (reprint author), AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,NIKOLSDORFERGASSE 18,A-1050 VIENNA,AUSTRIA. 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PAGANINI, P PAGANONI, M PAGES, P PALKA, H PAPADOPOULOU, TD PAPE, L PARKES, C PARODI, F PASSERI, A PEGORARO, M PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PHILLIPS, HT PIANA, G PIERRE, F PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PUKHAEVA, N PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G RIPP, I ROMERO, A RONCAGLIOLO, I RONCHESE, P ROOS, L ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SADOVSKY, A SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEDYKH, Y SEGAR, AM SEITZ, A SEKULIN, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SITAR, B SKAALI, TB SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVITSKI, I STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAUSS, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M TABARELLI, T TAVERNET, JP TCHIKILEV, O TILQUIN, A TIMMERMANS, J TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORASSA, E TORTORA, L TRANSTROMER, G TREILLE, D TRISCHUK, W TRISTRAM, G TROMBINI, A TRONCON, C TSIROU, A TURLUER, ML TYAPKIN, LA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VANELDIK, J VASSILOPOULOS, V VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VRBA, V WAHLEN, H WALCK, C WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKE, D WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YIP, K ZACH, F ZACHARATOU, C ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUCCHELLI, GC ZUMERLE, G AF ABREU, P ADAM, W ADYE, T AGASI, E AJINENKO, I ALEKSAN, R ALEKSEEV, GD ALLPORT, PP ALMEHED, S ALVSVAAG, SJ AMALDI, U AMATO, S ANDREAZZA, A ANDRIEUX, ML ANTILOGUS, P APEL, WD ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A BARING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BAUDOT, J BECKS, KH BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BLOCH, D BLUME, M BLYTH, S BOCCI, V BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRANCHINI, P BRAND, KD BRENNER, RA BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAPKIN, M CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COSSUTTI, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUM, A DAUNCEY, PD DAVENPORT, M DASILVA, W DEFOIX, C DELLARICCA, G DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DESAINTJEAN, C DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DREES, KA DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EHRET, R EIGEN, G EKELOF, T EKSPONG, G ELSING, M ENGEL, JP ERSHAIDAT, N ERZEN, B SANTO, ME FALK, E FASSOULIOTIS, D FEINDT, M FENYUK, A FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORMENTI, F FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GALLONI, A GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GELE, D GERBER, JP GIBBS, M GILLESPIE, D GOKIELI, R GOLOB, B GOPAL, G GORN, L GORSKI, M GRACCO, V GRAZIANI, E GROSDIDIER, G GUNNARSSON, P GUNTHER, M GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAJDUK, Z HALLGREN, A HAMACHER, K HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIGON, E HILKE, HJ HILL, TS HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P JACKSON, JN JACOBSSON, R JALOCHA, P JANIK, R JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONSSON, L JONSSON, P JORAM, C JUILLOT, P KAISER, M KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUMSTEIN, Z KRUPINSKI, W KUBINEC, P KUCEWICZ, W KURVINEN, K LACASTA, C LAKTINEH, I LAMBLOT, S LAMSA, JW LANCERI, L LANE, DW LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEFEBURE, V LEGAN, CK LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LIKO, D LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZ, JM LOPEZFERNANDEZ, A AGUERA, MAL LOUKAS, D LUTZ, P LYONS, L MACNAUGHTON, J MAEHLUM, G MAIO, A MALYCHEV, V MANDL, F MARCO, J MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTINEZRIVERO, C MARTINEZVIDAL, F GARCIA, SM MATORRAS, F MATTENUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, P MUELLER, H MUNDIM, LM MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NAVAS, S NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NIEUWENHUIZEN, M NIKOLAENKO, V NISS, P NOMEROTSKI, A NORMAND, A OBERSCHULTEBECKMANN, W OBRAZTSOV, V OLSHEVSKI, AG ONOFRE, A ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAGES, P PALKA, H PAPADOPOULOU, TD PAPE, L PARKES, C PARODI, F PASSERI, A PEGORARO, M PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PHILLIPS, HT PIANA, G PIERRE, F PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PUKHAEVA, N PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G RIPP, I ROMERO, A RONCAGLIOLO, I RONCHESE, P ROOS, L ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SADOVSKY, A SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEDYKH, Y SEGAR, AM SEITZ, A SEKULIN, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SITAR, B SKAALI, TB SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVITSKI, I STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAUSS, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M TABARELLI, T TAVERNET, JP TCHIKILEV, O TILQUIN, A TIMMERMANS, J TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORASSA, E TORTORA, L TRANSTROMER, G TREILLE, D TRISCHUK, W TRISTRAM, G TROMBINI, A TRONCON, C TSIROU, A TURLUER, ML TYAPKIN, LA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VANELDIK, J VASSILOPOULOS, V VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VRBA, V WAHLEN, H WALCK, C WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKE, D WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YIP, K ZACH, F ZACHARATOU, C ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUCCHELLI, GC ZUMERLE, G TI LIFETIME AND PRODUCTION-RATE OF BEAUTY BARYONS FROM Z-DECAYS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID HEAVY MESONS AB The production and decay of beauty baryons (b-baryons) have been studied using 1.7 x 10(6) Z hadronic decays collected by the DELPHI detector at LEP. Three different techniques were used to identify the b-baryons. The first method used pairs of a Lambda and a lepton to tag the b-baryon decay. The second method associated fully reconstructed Lambda(c) baryons with leptons. The third analysis reconstructed the b-baryon decay points by forming secondary vertices from identified protons and muons of opposite sign. Using these methods the following production rates were measured: f(b --> b-baryon) x BR(b-baryon --> Lambda l nu(l)X) = (0.30 +/- 0.06 +/- 0.04)%, f(b --> b-baryon) x BR(b-baryon --> Lambda(c)l nu(l)X) = (1.18 +/- 0.26(-0.21)(+0.31)%, f(b --> b-baryon) x BR(b-baryon --> p mu nu(mu)X) = (0.49 +/- 0.11 +/- (+0.15)(-0.11)%. The average b-baryon lifetime was determined to be: tau = 1.21(-0.18)(+.21)(stat.) +/- 0.04(exp.syst.)(-.07)(+.02)(th.syst,) ps. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. 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UNIV GRENOBLE 1,INST SCI NUCL,IN2P3,CNRS,F-38026 GRENOBLE,FRANCE. SEFT,HIGH ENERGY PHYS RES INST,SF-00014 HELSINKI,FINLAND. JOINT INST NUCL RES,MOSCOW 101000,RUSSIA. UNIV KARLSRUHE,INST EXPTL KERNPHYS,D-76128 KARLSRUHE,GERMANY. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. UNIV PARIS 11,LAB ACCELERATEUR LINEAIRE,IN2P3,CNRS,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,MERSEYSIDE,ENGLAND. UNIV PARIS 06,LPNHE,IN2P3,CNRS,F-75252 PARIS 05,FRANCE. UNIV PARIS 07,F-75252 PARIS 05,FRANCE. LUND UNIV,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV LYON 1,IPNL,IN2P3,CNRS,F-69622 VILLEURBANNE,FRANCE. UNIV COMPLUTENSE MADRID,E-28040 MADRID,SPAIN. UNIV AIX MARSEILLE 2,CPP,IN2P3,CNRS,F-13288 MARSEILLE 09,FRANCE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN O,DENMARK. CHARLES UNIV,MFF NUCL CTR,CR-18000 PRAGUE 8,CZECH REPUBLIC. NIKHEF H,1009 DB AMSTERDAM,NETHERLANDS. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV OVIEDO,DEPT FIS,E-33006 OVIEDO,SPAIN. UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. IST NAZL FIS NUCL,I-35131 PADUA,ITALY. RUTHERFORD APPLETON LAB,CHILTON OX11 0QX,ENGLAND. UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY. IST NAZL FIS NUCL,I-00173 ROME,ITALY. CENS,DSM,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. IST SUPER SANITA,IST NAZL FIS NUCL,I-00161 ROME,ITALY. UNIV CANTABRIA,CSIC,CEAFM,E-39006 SANTANDER,SPAIN. INST HIGH ENERGY PHYS,PROTVINO,RUSSIA. UNIV LJUBLJANA,JOZEF STEFAN INST,LJUBLJANA 61000,SLOVENIA. UNIV LJUBLJANA,DEPT PHYS,LJUBLJANA 61000,SLOVENIA. UNIV STOCKHOLM,FYSIKUM,S-11385 STOCKHOLM,SWEDEN. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. IST NAZL FIS NUCL,I-10125 TURIN,ITALY. UNIV TRIESTE,DIPARTMENTO FIS,I-34127 TRIESTE,ITALY. IST NAZL FIS NUCL,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. FED UNIV RIO DE JANEIRO,BR-21945970 RIO JANEIRO,BRAZIL. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV VALENCIA,CSIC,IFIC,E-46100 BURJASSOT,SPAIN. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. UNIV WARSAW,INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,D-42097 WUPPERTAL 1,GERMANY. RP ABREU, P (reprint author), FCUL,INST SUPER TECN,LIP,AV ELIAS GARCIA 14-1,P-1000 LISBON,PORTUGAL. RI branchini, paolo/A-4857-2011; Krammer, Manfred/A-6508-2010; De Saint Jean, Cyrille/E-8853-2011; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Torassa, Ezio/I-1788-2012; Fruhwirth, Rudolf/H-2529-2012; Andreazza, Attilio/E-5642-2011; Verlato, Marco/J-4604-2012; Nomerotski, Andrei/A-5169-2010; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; Ragazzi, Stefano/D-2463-2009; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Smirnova, Oxana/A-4401-2013; Della Ricca, Giuseppe/B-6826-2013; Olshevskiy, Alexander/I-1580-2016; Rames, Jiri/H-2450-2014; Paganoni, Marco/A-4235-2016; Contreras Gonzalez, Jose Luis/K-7255-2014; Abreu, Pedro/L-2220-2014; Dracos, Marcos/K-2335-2012; Hallgren, Allan/A-8963-2013; Botner, Olga/A-9110-2013; Mundim, Luiz/A-1291-2012; Zalewski, Piotr/H-7335-2013; Marti-Garcia, Salvador/F-3085-2011; Nemecek, Stanislav/G-5931-2014; Ridky, Jan/H-6184-2014; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Espirito Santo, Maria Catarina/L-2341-2014; gandelman, miriam/N-3739-2014; Barao, Fernando/O-2357-2016; Navas, Sergio/N-4649-2014; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; Yip, Kin/D-6860-2013; OI Krammer, Manfred/0000-0003-2257-7751; Shellard, Ronald/0000-0002-2983-1815; Petrolini, Alessandro/0000-0003-0222-7594; Andreazza, Attilio/0000-0001-5161-5759; Verlato, Marco/0000-0003-1967-7655; Ruiz, Alberto/0000-0002-3639-0368; Ragazzi, Stefano/0000-0001-8219-2074; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Smirnova, Oxana/0000-0003-2517-531X; Della Ricca, Giuseppe/0000-0003-2831-6982; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Abreu, Pedro/0000-0002-9973-7314; Dracos, Marcos/0000-0003-0514-193X; Mundim, Luiz/0000-0001-9964-7805; Ridky, Jan/0000-0001-6697-1393; Tome, Bernardo/0000-0002-7564-8392; Espirito Santo, Maria Catarina/0000-0003-1286-7288; Barao, Fernando/0000-0002-8346-9941; Navas, Sergio/0000-0003-1688-5758; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Matteuzzi, Clara/0000-0002-4047-4521; DE MIN, ALBERTO/0000-0002-8130-9389; Demaria, Natale/0000-0003-0743-9465; Bonesini, Maurizio/0000-0001-5119-1896; Sannino, Mario/0000-0001-7700-8383; Maio, Amelia/0000-0001-9099-0009; De Angelis, Alessandro/0000-0002-3288-2517; Yip, Kin/0000-0002-8576-4311; PREST, MICHELA/0000-0003-3161-4454; De Lotto, Barbara/0000-0003-3624-4480; Tabarelli de Fatis, Tommaso/0000-0001-6262-4685; Lacasta, Carlos/0000-0002-2623-6252; Torassa, Ezio/0000-0003-2321-0599 NR 20 TC 30 Z9 30 U1 0 U2 4 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD OCT PY 1995 VL 68 IS 3 BP 375 EP 390 PG 16 WC Physics, Particles & Fields SC Physics GA RY369 UT WOS:A1995RY36900003 ER PT J AU KANDLER, T STOHLKER, T MOKLER, PH KOZHUHAROV, C GEISSEL, H SCHEIDENBERGER, C RYMUZA, P STACHURA, Z WARCZAK, A DUNFORD, RW EICHLER, J ICHIHARA, A SHIRAI, T AF KANDLER, T STOHLKER, T MOKLER, PH KOZHUHAROV, C GEISSEL, H SCHEIDENBERGER, C RYMUZA, P STACHURA, Z WARCZAK, A DUNFORD, RW EICHLER, J ICHIHARA, A SHIRAI, T TI PHOTON ANGULAR-DISTRIBUTION OF RADIATIVE ELECTRON-CAPTURE INTO THE M-SHELL OF HE-LIKE URANIUM IONS AT 110-140 MEV/U SO ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS LA English DT Article AB Measurements of the photon angular distribution of Radiative Electron Capture into the M shell have been performed with He-like uranium ions in the range 110-140 MeV/u. In addition, L REC was studied at a projectile energy of 140 MeV/u. In both cases, the experimental data show an asymmetry around 90 degrees and agree well with a fully relativistic theory. C1 INST PROBLEMOW JADROWYCH, PL-05400 OTWOCK, POLAND. INST FIZYKI JADROWEJ, PL-31342 KRAKOW, POLAND. JAGIELLONIAN UNIV, INST FIZYKI, PL-30059 KRAKOW, POLAND. ARGONNE NATL LAB, DIV PHYS, ARGONNE, IL 60439 USA. HAHN MEITNER INST BERLIN GMBH, BEREICH THEORET PHYS, D-14109 BERLIN, GERMANY. JAPAN ATOM ENERGY RES INST, TOKAI, IBARAKI 31911, JAPAN. RP KANDLER, T (reprint author), GESELL SCHWERIONENFORSCH MBH, D-64220 DARMSTADT, GERMANY. NR 15 TC 10 Z9 10 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0178-7683 J9 Z PHYS D ATOM MOL CL JI Z. Phys. D-Atoms Mol. Clusters PD OCT PY 1995 VL 35 IS 1 BP 15 EP 18 PG 4 WC Physics, Atomic, Molecular & Chemical SC Physics GA TB768 UT WOS:A1995TB76800003 ER PT J AU DOUGHERTY, J ITON, LE WHITE, JW AF DOUGHERTY, J ITON, LE WHITE, JW TI ROOM-TEMPERATURE AGING OF A ZSM-5 PREPARATION DETECTED BY SMALL-ANGLE X-RAY AND NEUTRON-SCATTERING AND NMR-SPECTROSCOPY SO ZEOLITES LA English DT Article DE ZSM-5; AGING; ALUMINOSILICATE MICROGEL; SMALL-ANGLE X-RAY SCATTERING; SMALL-ANGLE NEUTRON SCATTERING ID ALUMINOSILICATE SOLUTIONS; COLLOIDAL SILICA; ZEOLITE; CRYSTALLIZATION; ANIONS; GELS AB The room temperature aging process in a solution phase ZSM-5 preparation has been studied by scattering and n.m.r. techniques. Small-angle X-ray scattering detected particles growing in the 1-10 nm size domain, and their evolution was followed over a period of 4 days; the most dramatic changes occurred in the first 24 h. A contrast variation small-angle neutron scattering experiment was performed to determine if the particles that formed contained the template, the tetrapropylammonium cation. The nature of the bonds formed during the aging process was investigated by liquid phase Si-29, C-13, and Al-27 n.m.r. experiments. C1 AUSTRALIAN NATL UNIV, RES SCH CHEM, CANBERRA, ACT 0200, AUSTRALIA. ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. NR 48 TC 46 Z9 46 U1 2 U2 7 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0144-2449 J9 ZEOLITES JI Zeolites PD OCT PY 1995 VL 15 IS 7 BP 640 EP 649 DI 10.1016/0144-2449(95)00045-8 PG 10 WC Chemistry, Physical SC Chemistry GA RT891 UT WOS:A1995RT89100011 ER PT J AU HJELM, A TRYGG, J ERIKSSON, O JOHANSSON, B WILLS, JM AF HJELM, A TRYGG, J ERIKSSON, O JOHANSSON, B WILLS, JM TI ORBITAL PARAMAGNETISM IN METALLIC SYSTEMS WITH LARGE ANGULAR MOMENTA SO INTERNATIONAL JOURNAL OF MODERN PHYSICS B LA English DT Review ID MAGNETIZATION DENSITY; BRILLOUIN-ZONE; SPECIAL POINTS; MAGNETISM; BAND; ENERGIES AB We demonstrate that the field induced spin and orbital moments in paramagnetic metals in general are parallel, since the Zeeman energy overcomes the spin-orbit energy that is in favor of an antiparallel arrangement when the electronic shell is less than half-filled. In the early actinides, however, the spin-orbit energy becomes sufficiently strong to approach the border where the moments can couple antiparallel. This results in peculiar magnetic states for alpha-Pu and some uranium compounds, where the spin moments are antiparallel to the applied field and the magnetic response dominated by the orbital character, and consequently these systems display unusual spin densities and magnetic form factors. C1 UNIV UPPSALA, DEPT PHYS, CONDENSED MATTER THEORY GRP, S-75121 UPPSALA, SWEDEN. LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87544 USA. RP UNIV UPPSALA, DEPT TECHNOL, BOX 534, S-75121 UPPSALA, SWEDEN. RI Eriksson, Olle/E-3265-2014 OI Eriksson, Olle/0000-0001-5111-1374 NR 41 TC 9 Z9 9 U1 1 U2 8 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0217-9792 EI 1793-6578 J9 INT J MOD PHYS B JI Int. J. Mod. Phys. B PD SEP 30 PY 1995 VL 9 IS 21 BP 2735 EP 2751 DI 10.1142/S0217979295001026 PG 17 WC Physics, Applied; Physics, Condensed Matter; Physics, Mathematical SC Physics GA TB031 UT WOS:A1995TB03100001 ER PT J AU Bricker, TM Smith, FG Houk, RS AF Bricker, TM Smith, FG Houk, RS TI Charge transfer reactions between xenon ions and iron atoms in an argon-xenon inductively coupled plasma SO SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY LA English DT Article ID MASS-SPECTROMETRY; LEVEL POPULATIONS; IONIZATION; SPECTROSCOPY; TEMPERATURE; EXCITATION; MECHANISMS; EXCHANGE; DROPLETS; DENSITY AB Xenon is added to the axial channel of an argon inductively coupled plasma (ICP) at doses up to 1.5% of the aerosol gas flow. Emission is collected from the gas flowing into the sampling orifice of a mass spectrometer (MS). These Xe doses have little effect on the electron density n(e) or on the intensities of Fe (I) emission lines. Certain Fe (II) lines are enhanced when Xe is added, particularly those from Fe+ states that can be populated by near-resonant charge transfer between Xe+ and neutral Fe. Calculations based on measured values of n(e) indicate that Xe+ should be present at densities of up to 7 x 10(14) cm(-3), which should be sufficient Xe+ to drive the proposed charge transfer reactions. RP Bricker, TM (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,US DOE,AMES LAB,AMES,IA 50011, USA. NR 35 TC 9 Z9 9 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0584-8547 J9 SPECTROCHIM ACTA B JI Spectroc. Acta Pt. B-Atom. Spectr. PD SEP 30 PY 1995 VL 50 IS 11 BP 1325 EP 1335 DI 10.1016/0584-8547(95)01357-7 PG 11 WC Spectroscopy SC Spectroscopy GA TM056 UT WOS:A1995TM05600004 ER PT J AU MCPHERSON, DW LAMBERT, CR JAHN, K SOOD, V MCREE, RC ZEEBERG, B REBA, RC KNAPP, FFR AF MCPHERSON, DW LAMBERT, CR JAHN, K SOOD, V MCREE, RC ZEEBERG, B REBA, RC KNAPP, FFR TI RESOLUTION AND IN-VITRO AND INITIAL IN-VIVO EVALUATION OF ISOMERS OF IODINE-125-LABELED 1-AZABICYCLO[2.2.2]OCT-3-YL ALPHA-HYDROXY-ALPHA-(1-IODO-1-PROPEN-3-YL)-ALPHA-PHENYLACETATE - A HIGH-AFFINITY LIGAND FOR THE MUSCARINIC RECEPTOR SO JOURNAL OF MEDICINAL CHEMISTRY LA English DT Article ID EMISSION COMPUTED-TOMOGRAPHY; ACETYLCHOLINE-RECEPTORS; 3-QUINUCLIDINYL BENZILATE; ALZHEIMERS-DISEASE; POTENTIAL RADIOPHARMACEUTICALS; CHOLINERGIC RECEPTOR; OPTICAL ISOMERS; HUMAN-BRAIN; RAT-BRAIN; BINDING AB 1-Azabicyclo[2.2.2]oct-3-yl alpha-hydroxy-alpha-(1-iodo-1-propen-3-yl)-alpha-phenylacetate (IQNP, 1), is a highly selective ligand for the muscarinic acetylcholinergic receptor (mAChR). There are eight stereoisomers in the racemic mixture. The optical isomers of alpha-hydroxy-alpha-phenyl-alpha-(1-propyn-3-yl)acetic acid were resolved as the alpha-methylbenzylamine salts, and the optical isomers of 3-quinuclidinol were resolved as the tartrate salts. The E and Z isomers were prepared by varying the reaction conditions for the stannylation of the triple bond followed by purification utilizing flash column chromatography. In vitro binding assay of the four stereoisomers containing the (R)-(-)-3-quinuclidinyl ester demonstrated that each isomer of 1 bound to mAChR with high affinity. In addition, (E)-(-)-(-)-IQNP demonstrated the highest receptor subtype specificity between the ml molecular subtype (K-D, nM, 0.383 +/- 0.102) and the m2 molecular subtype (29.6 +/- 9.70). In vivo biodistribution studies demonstrated that iodine-125-labeled (E)-(-)-(+)-1 cleared rapidly from the brain and heart. In contrast, iodine-125-labeled (E)-(-)-(-)-, (Z)-(-)-(-)-, and (Z)-(-)-(+)-1 have high uptake and retention in mAChR rich areas of the brain. It was also observed that(E)-(-)-(-)-IQNP demonstrated an apparent subtype selectivity in vivo with retention in M(1) (m1, m4) mAChR areas of the rain. In addition, (Z)-(-)-(-)-IQNP also demonstrated significant uptake in tissues containing the M(2) (m2) mAChR subtype. These results demonstrate that the iodine-123-labeled analogues of the (E)-(-)-(-)- and (Z)-(-)-(-)-IQNP isomers are attractive candidates for single-photon emission-computed tomographic imaging of cerebral and cardiac mAChR receptor densities. C1 GEORGE WASHINGTON UNIV,MED CTR,DIV NUCL MED,RADIOPHARMACEUT CHEM SECT,WASHINGTON,DC 20037. UNIV CHICAGO,DEPT RADIOL,NUCL MED SECT,CHICAGO,IL 60637. RP MCPHERSON, DW (reprint author), OAK RIDGE NATL LAB,DIV HLTH SCI RES,NUCL MED GRP,BLDG 4501,MAIL STOP 6229POB 2008,OAK RIDGE,TN 37831, USA. RI Sood, Vinay/B-7109-2008 FU NINDS NIH HHS [NS-22215] NR 46 TC 25 Z9 25 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-2623 J9 J MED CHEM JI J. Med. Chem. PD SEP 29 PY 1995 VL 38 IS 20 BP 3908 EP 3917 DI 10.1021/jm00020a004 PG 10 WC Chemistry, Medicinal SC Pharmacology & Pharmacy GA RY255 UT WOS:A1995RY25500004 PM 7562924 ER PT J AU RAMAN, NK BRINKER, CJ AF RAMAN, NK BRINKER, CJ TI ORGANIC TEMPLATE APPROACH TO MOLECULAR-SIEVING SILICA MEMBRANES SO JOURNAL OF MEMBRANE SCIENCE LA English DT Article DE MICROPOROUS AND POROUS MEMBRANES; GAS SEPARATIONS; ORGANIC TEMPLATES ID STRUCTURE-PERMEABILITY RELATIONSHIPS; SEPARATION AB We demonstrate a ''template'' approach to prepare microporous inorganic membranes exhibiting high flux combined with hi,oh selectivity, overcoming limitations inherent to both conventional inorganic (sol-gel, CVD) and organic membrane approaches. Hybrid organic-inorganic polymers prepared by co-polymerization of tetraethoxysilane (TEOS) and methyltriethoxysilane (MTES) were deposited on commercial asymmetric alumina supports. Heat treatments were employed to densify the inorganic matrix and pyrolyze the methyl ligands, creating a continuous network of micropores. Resulting membranes exhibited very high CO2 permeance values (2.57 X 10(-3) cm(3)/cm(2) s cm Hg) combined with moderate CO2/CH4, selectivities (12.2). Subsequent derivatization of the pore surfaces with monomeric TEOS significantly increased CO2/CH4 separation factors (71.5) with only a modest reduction in CO2 permeance (2.04 X 10(-4) cm(3)/cm(2) s cm Hg). Combined CO2/CH4 selectivity factors and CO2 fluxes exceeded those of all known organic membranes. C1 UNIV NEW MEXICO,CTR MICROENGINEERED CERAM,NSF,ALBUQUERQUE,NM 87131. SANDIA NATL LABS,ADV MAT LAB,ALBUQUERQUE,NM 87106. RI Loy, Douglas/D-4847-2009 OI Loy, Douglas/0000-0001-7635-9958 NR 12 TC 158 Z9 161 U1 1 U2 19 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0376-7388 J9 J MEMBRANE SCI JI J. Membr. Sci. PD SEP 29 PY 1995 VL 105 IS 3 BP 273 EP 279 DI 10.1016/0376-7388(95)00067-M PG 7 WC Engineering, Chemical; Polymer Science SC Engineering; Polymer Science GA RY061 UT WOS:A1995RY06100010 ER PT J AU SCHIFFER, M AINSWORTH, CF DENG, YL JOHNSON, G PASCOE, FH HANSON, DK AF SCHIFFER, M AINSWORTH, CF DENG, YL JOHNSON, G PASCOE, FH HANSON, DK TI PROLINE IN A TRANSMEMBRANE HELIX COMPENSATES FOR CAVITIES IN THE PHOTOSYNTHETIC REACTION-CENTER SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE MEMBRANE PROTEIN; PROLINE; CAVITIES IN PROTEINS; PROTEIN FOLDING; PROTEIN STABILITY ID HEAT-LABILE ENTEROTOXIN; RHODOBACTER-SPHAEROIDES; RHODOPSEUDOMONAS-CAPSULATA; BINDING-SITE; MUTATIONS; TEMPERATURE; RESIDUES; PATHWAYS; MUTANTS; BACTERIORHODOPSIN AB A site-specific double mutant, in which the large aromatic residues M208Tyr and L181Phe in the interior of the photosynthetic reaction center (RC) complex were replaced by smaller threonine residues, showed a dramatic reduction in the number of assembled complexes and was incapable of photosynthetic growth. The cavity created by the smaller side-chains was thought to interfere with the stability and/or assembly of the complex. Phenotypic revertants were recovered in which a spontaneous second-site mutation restored photocompetence in the presence of the original site-specific mutations. In these strains, an Ala --> Pro substitution in a neighboring transmembrane helix (at M271) resulted in an increased yield of RC complexes. To test the hypothesis that the original phenotype was due to a cavity, other mutants were constructed that created similar-sized voids at other positions in the membrane-spanning interior. These substitutions caused the same phenotype. Coupling of the above proline substitution to these new cavity mutants also resulted in photocompetent strains that carry increased levels of RC complexes. Therefore, the proline substitution at M271 serves as a global suppressor of the phenotype caused by these internal cavities. The proline substitution slightly increases the thermal stability of the complex at higher temperatures, but the mutant and suppressor strains have about the same stability at the optimal culture temperature, where both are less stable than the wild-type strain. Therefore, the proline substitution may suppress the non-photosynthetic phenotype of cavity mutants by facilitating folding of the nascent polypeptides as they assemble with cofactors to form the transmembranar RC complex. The proline replacement occurs at a pre-existing kink in a transmembrane helix where it can be accommodated without introducing a strain in the structure. The function of proline residues in transmembrane helices might be to promote folding and/or assembly in general. (C) 1995 Academic Press Limited RP ARGONNE NATL LAB, CTR MECH BIOL & BIOTECHNOL, 9700 S CASS AVE, ARGONNE, IL 60439 USA. FU NIGMS NIH HHS [GM36598] NR 44 TC 11 Z9 11 U1 0 U2 1 PU ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD PI LONDON PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND SN 0022-2836 EI 1089-8638 J9 J MOL BIOL JI J. Mol. Biol. PD SEP 29 PY 1995 VL 252 IS 4 BP 472 EP 482 DI 10.1006/jmbi.1995.0512 PG 11 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA RX458 UT WOS:A1995RX45800009 PM 7563066 ER PT J AU BROWNE, JC PYNN, R AF BROWNE, JC PYNN, R TI MULTIPLE-USE PHYSICS FACILITIES SO SCIENCE LA English DT Letter RP BROWNE, JC (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS NEUTRON SCI CTR,POB 1663,LOS ALAMOS,NM 87544, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC ADVAN SCIENCE PI WASHINGTON PA 1333 H ST NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD SEP 29 PY 1995 VL 269 IS 5232 BP 1801 EP 1801 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA RX194 UT WOS:A1995RX19400002 ER PT J AU CARPENTER, JM AF CARPENTER, JM TI MULTIPLE-USE PHYSICS FACILITIES SO SCIENCE LA English DT Letter RP CARPENTER, JM (reprint author), ARGONNE NATL LAB,INTENSE PULSED NEUTRON SOURCE,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC ADVAN SCIENCE PI WASHINGTON PA 1333 H ST NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD SEP 29 PY 1995 VL 269 IS 5232 BP 1801 EP 1802 DI 10.1126/science.269.5232.1801-a PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA RX194 UT WOS:A1995RX19400003 PM 17820229 ER PT J AU ROSEN, L AF ROSEN, L TI MULTIPLE-USE PHYSICS FACILITIES SO SCIENCE LA English DT Letter RP ROSEN, L (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87544, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC ADVAN SCIENCE PI WASHINGTON PA 1333 H ST NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD SEP 29 PY 1995 VL 269 IS 5232 BP 1803 EP 1803 DI 10.1126/science.7569907 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA RX194 UT WOS:A1995RX19400004 ER PT J AU SARGIS, PD HAIGH, RE MCCAMMON, KG YOUNG, S AF SARGIS, PD HAIGH, RE MCCAMMON, KG YOUNG, S TI SUBCARRIER MULTIPLEXING WITH DISPERSION REDUCTION SO ELECTRONICS LETTERS LA English DT Article DE OPTICAL COMMUNICATION; OPTICAL DISPERSION; SUBCARRIER MULTIPLEXING AB A novel dispersion-reduction technique using subcarrier multiplexing and optical prefiltering is described. Measured results from a data link demonstrate that a pair of independent 2.5 Gbit/s data channels can be transmitted over greater than or equal to 100km of ordinary singlemode fibre-optic cable at 1550 nm with negligible dispersion. RP SARGIS, PD (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-054,LIVERMORE,CA 94551, USA. NR 3 TC 11 Z9 11 U1 0 U2 0 PU IEE-INST ELEC ENG PI HERTS PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTS, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD SEP 28 PY 1995 VL 31 IS 20 BP 1769 EP 1770 DI 10.1049/el:19951212 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA RY742 UT WOS:A1995RY74200045 ER PT J AU KRASNOPEROV, LN NIIRANEN, JT GUTMAN, D MELIUS, CF ALLENDORF, MD AF KRASNOPEROV, LN NIIRANEN, JT GUTMAN, D MELIUS, CF ALLENDORF, MD TI KINETICS AND THERMOCHEMISTRY OF SI(CH3)(3)+NO REACTION - DIRECT DETERMINATION OF A SI-N BOND-ENERGY SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; THERMAL UNIMOLECULAR REACTIONS; DIODE-LASER SPECTROSCOPY; COLLISION RATE CONSTANTS; GAS-PHASE; LMR METHOD; PHOTOLYSIS; SILICON; TIME; HEXAMETHYLDISILANE AB The reaction of trimethylsilyl radicals with nitric oxide, Si(CH3)(3) + NO reversible arrow Si(CH3)(3)NO, has been studied using pulsed excimer-laser photolysis coupled with time-resolved photoionization mass spectrometry over the temperature range 300-812 K. The reaction rate constant was measured as a function of temperature and density (He) in the range 0.82 x 10(16) [He] 15.7 x 10(16) molecules cm(-3). Equilibrium constants for the reaction were measured between 685 and 787 K. The standard enthalpy of the reaction Si(CH3)(3) + NO reversible arrow Si(CH3)(3)NO was obtained from the measured equilibrium constants using both second- and third-law methods. The two procedures yielded results in good agreement: Delta H-298(o) = -183 + 11 kJ mol(-1) (second law) and Delta H-298(o) = -190.2 +/- 3.6 kJ mol(-1) (third law), the latter being more accurate. The high-pressure-limit rate constant of reaction Si(CH3)(3) +/- NO --> Si(CH3)(3)NO, obtained by a short extrapolation of the experimental data using the Troe factorization technique, has a small negative temperature dependence: k(infinity.rec) = (3.8 +/- 0.4) x 10-(11) (T/298)(-(0.6) (+/-) (0.2)). Ab initio calculations with empirical bond additivity corrections have been performed to determine the structure, vibrational frequencies, and energies of the low-lying electronic singlet and triplet states of the Si(CH3)(3)NO molecule. The calculated thermodynamic functions of the molecule were used to obtain the standard entropy of the reaction (Delta S-298(o) = -147.9 J mol(-1) K-1) that was used in the third-law thermochemical calculations. The theoretical standard enthalpy of the reaction, Delta H-298(o)(calc) = -190.9 kT mol(-1), is in excellent agreement with that determined experimentally using the third-law procedure. The intrinsic Si(CH3)(3)-NO bond strength of 187.4 +/- 4.0 kJ mol(-1) (-Delta H-0(o) for the reaction) was determined using the measured enthalpy of the reaction at 298 K (by the third-law method) and the calculated relative enthalpy functions. This study provides the first direct experimental determination of a Si-N bond strength. C1 CATHOLIC UNIV AMER, DEPT CHEM, WASHINGTON, DC 20064 USA. SANDIA NATL LABS, COMBUST RES FACIL, LIVERMORE, CA 94551 USA. RP KRASNOPEROV, LN (reprint author), NEW JERSEY INST TECHNOL, DEPT CHEM ENGN CHEM & ENVIRONM SCI, NEWARK, NJ 07102 USA. NR 68 TC 26 Z9 26 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD SEP 28 PY 1995 VL 99 IS 39 BP 14347 EP 14358 DI 10.1021/j100039a023 PG 12 WC Chemistry, Physical SC Chemistry GA RX875 UT WOS:A1995RX87500023 ER PT J AU CHEN, PY HOLROYD, RA AF CHEN, PY HOLROYD, RA TI EFFECT OF SUBSTITUENTS ON THE VOLUME AND FREE-ENERGY CHANGES FOR ELECTRON-ATTACHMENT TO BUTADIENES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID PRESSURE AB The pressure and temperature dependence of electron attachment equilibria to 1-(trimethylsiloxy)-1,3-butadiene and 1,1,4,4-tetramethyl-1,3-butadiene were studied in n-hexane. The measured volume changes were less than expected for a full glassy solvent shell around the butadiene anion moiety, suggesting the substituents on the butadiene exclude at least one solvent molecule from the shell. The substituted anions are also less stable than the butadiene anion. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NR 8 TC 5 Z9 5 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD SEP 28 PY 1995 VL 99 IS 39 BP 14528 EP 14530 DI 10.1021/j100039a046 PG 3 WC Chemistry, Physical SC Chemistry GA RX875 UT WOS:A1995RX87500046 ER PT J AU ERSKINE, DJ HOLMES, NC AF ERSKINE, DJ HOLMES, NC TI WHITE-LIGHT VELOCIMETRY SO NATURE LA English DT Article ID ORIENTED GRAPHITE; INTERFEROMETER; TRANSFORMATION; DIAMOND; SYSTEM AB RADIATION reflected from a moving object experiences a Doppler shift in its frequency. This basic phenomenon underlies practical interferometric techniques for remote velocity measurement used widely in meteorology and law enforcement, as well as in medicine(1) (using acoustic waves) and other fields of science and engineering(2-5). Existing velocimetric techniques use coherent quasimonochromatic sources of illumination, which, for optical applications, generally limits practical sources to lasers operating in single-frequency mode. Such sources are not, however, sufficiently powerful for applications where simultaneous velocity measurements at many points on a target are desired. Here we describe a technique for remote velocity measurement that uses broadband incoherent illumination. The viability of this technique is demonstrated by measuring the velocity of a target moving at 16 m s(-1) using white light from an incandescent source. Powerful, compact and inexpensive radiation sources (such as flash and are lamps, or lasers operating at several wavelengths) can now be exploited for high-power applications of remote-target velocimetry. RP ERSKINE, DJ (reprint author), LAWRENCE LIVERMORE NATL LAB,5000 E AVE,LIVERMORE,CA 94551, USA. NR 18 TC 11 Z9 11 U1 1 U2 1 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD SEP 28 PY 1995 VL 377 IS 6547 BP 317 EP 320 DI 10.1038/377317a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA RX111 UT WOS:A1995RX11100048 ER PT J AU DOGGETT, NA GOODWIN, LA TESMER, JG MEINCKE, LJ BRUCE, DC CLARK, LM ALTHERR, MR FORD, AA CHI, HC MARRONE, BL LONGMIRE, JL LANE, SA WHITMORE, SA LOWENSTEIN, MG SUTHERLAND, RD MUNDT, MO KNILL, EH BRUNO, WJ MACKEN, CA TORNEY, DC WU, JR GRIFFITH, J SUTHERLAND, GR DEAVEN, LL CALLEN, DF MOYZIS, RK AF DOGGETT, NA GOODWIN, LA TESMER, JG MEINCKE, LJ BRUCE, DC CLARK, LM ALTHERR, MR FORD, AA CHI, HC MARRONE, BL LONGMIRE, JL LANE, SA WHITMORE, SA LOWENSTEIN, MG SUTHERLAND, RD MUNDT, MO KNILL, EH BRUNO, WJ MACKEN, CA TORNEY, DC WU, JR GRIFFITH, J SUTHERLAND, GR DEAVEN, LL CALLEN, DF MOYZIS, RK TI AN INTEGRATED PHYSICAL MAP OF HUMAN-CHROMOSOME-16 SO NATURE LA English DT Article ID DINUCLEOTIDE REPEAT POLYMORPHISMS; REPETITIVE DNA-SEQUENCES; HUMAN GENOME; CLONES; CLONING; FRAGMENTS; REGIONS; VECTOR AB We describe an integrated physical, genetic and cytogenetic map of human chromosome 16 comprising both a low-resolution megaYAC map and a high-resolution cosmid contig/miniYAC map, which provides nearly complete coverage of the euchromatic arms of the chromosome. The physical map is anchored to a high-resolution cytogenetic breakpoint map and is integrated with genetic and gene transcript maps of the chromosome by sequence-tagged sites and clone hybridizations. C1 LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,THEORET BIOL & BIOPHYS GRP,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,APPLICAT PROGRAMMING GRP,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,COMP RES & APPLICAT GRP,LOS ALAMOS,NM 87545. ADELAIDE CHILDRENS HOSP INC,DEPT CYTOGENET & MOLEC GENET,ADELAIDE,SA 5006,AUSTRALIA. UNIV NEW MEXICO,DEPT CELL BIOL,ALBUQUERQUE,NM 87131. RP DOGGETT, NA (reprint author), LOS ALAMOS NATL LAB,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM 87545, USA. RI Sutherland, Grant/D-2606-2012; Callen, David/G-1975-2012 NR 46 TC 97 Z9 97 U1 0 U2 2 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD SEP 28 PY 1995 VL 377 SU S BP 335 EP 365 PG 31 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA TA343 UT WOS:A1995TA34300006 PM 7566100 ER PT J AU AMSLER, C ARMSTRONG, DS BAKER, CA BARNETT, BM BATTY, CJ BENAYOUN, M BEUCHERT, K BIRIEN, P BLUM, P BOSSINGHAM, R BRAUNE, K BROSE, J BUGG, DV CASE, T COOPER, AR CRAMER, O CROWE, KM DEGENER, T DIETZ, HP DJAOSHVILI, N DOMBROWSKI, SV DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA GIARRITTA, P HACKMANN, R HADDOCK, RP HEINSIUS, FH HERZ, M HESSEY, NP HIDAS, P HOLZHAUSSEN, C ILLINGER, P JAMNIK, D KALINOWSKY, H KALTEYER, B KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOCH, H KOLO, C KUNZE, M LAKATA, M LANDUA, R LUDEMANN, J MATTHAY, H MCCRADY, R MERLO, JP MEYER, CA MONTANET, L NOBLE, A OUARED, R OULDSAADA, F PETERS, K PINDER, CN PINTER, G RAVNDAL, S REGENFUS, C SCHAFER, E SCHMIDT, P SCHUTRUMPF, M SCOTT, I SEIBERT, R SPANIER, S STOCK, H STRASSBURGER, C STROHBUSCH, U SUFFERT, M THOMA, U TISCHHAUSER, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J AF AMSLER, C ARMSTRONG, DS BAKER, CA BARNETT, BM BATTY, CJ BENAYOUN, M BEUCHERT, K BIRIEN, P BLUM, P BOSSINGHAM, R BRAUNE, K BROSE, J BUGG, DV CASE, T COOPER, AR CRAMER, O CROWE, KM DEGENER, T DIETZ, HP DJAOSHVILI, N DOMBROWSKI, SV DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA GIARRITTA, P HACKMANN, R HADDOCK, RP HEINSIUS, FH HERZ, M HESSEY, NP HIDAS, P HOLZHAUSSEN, C ILLINGER, P JAMNIK, D KALINOWSKY, H KALTEYER, B KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOCH, H KOLO, C KUNZE, M LAKATA, M LANDUA, R LUDEMANN, J MATTHAY, H MCCRADY, R MERLO, JP MEYER, CA MONTANET, L NOBLE, A OUARED, R OULDSAADA, F PETERS, K PINDER, CN PINTER, G RAVNDAL, S REGENFUS, C SCHAFER, E SCHMIDT, P SCHUTRUMPF, M SCOTT, I SEIBERT, R SPANIER, S STOCK, H STRASSBURGER, C STROHBUSCH, U SUFFERT, M THOMA, U TISCHHAUSER, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J TI E-DECAYS TO ETA-PI-PI IN (P)OVER-BAR-P ANNIHILATION AT REST SO PHYSICS LETTERS B LA English DT Article ID PARTIAL-WAVE ANALYSIS; ETA(1430); STATE; SPIN AB We have observed the eta pi(+)pi(-) and eta pi(0) pi(0) decay modes of the E meson in ($) over bar pp annihilation at rest into pi(+)pi(-)pi(0) pi(0) eta. The mass and width of the E meson are 1409 +/- 3 and 86 +- 10 MeV. The production and decay branching ratio is B(($) over bar pp --> E pi pi)B(E --> eta pi pi = (3.3 +/- 1.0) x 10(-3). With a spin-parity analysis we determine that J(p) = 0(-). The observation of the eta pi(0) phi(0) decay mode establishes that E is isoscalar (C = + 1). We find that E decays to eta(pi pi)(s) (where (pi pi)(s) is an S-wave dipion) and pi alpha(0)(980)(--> pi eta) with a relative branching ratio of (78 +/- 16)%. Using the K ($) over bar K pi production and decay branching ratio measured earlier we determine that B[E --> $($) over bar$$ KK pi]/B[E --> eta pi pi] = 0.61 +/- 0.19. A comparison with observations in radiative J/psi decays suggests that E and iota/eta(1416) are identical. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RUHR UNIV BOCHUM,D-44780 BOCHUM,GERMANY. UNIV BONN,D-53115 BONN,GERMANY. ACAD SCI BUDAPEST,H-1525 BUDAPEST,HUNGARY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. CERN,CH-1211 GENEVA,SWITZERLAND. UNIV HAMBURG,D-22761 HAMBURG,GERMANY. UNIV KARLSRUHE,D-76021 KARLSRUHE,GERMANY. UNIV LONDON QUEEN MARY & WESTFIELD COLL,LONDON E1 4NS,ENGLAND. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV MAINZ,D-55099 MAINZ,GERMANY. UNIV MUNICH,D-80333 MUNICH,GERMANY. CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213. CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. RP AMSLER, C (reprint author), UNIV ZURICH,CH-8057 ZURICH,SWITZERLAND. RI Meyer, Curtis/L-3488-2014 OI Meyer, Curtis/0000-0001-7599-3973 NR 27 TC 57 Z9 57 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD SEP 28 PY 1995 VL 358 IS 3-4 BP 389 EP 398 DI 10.1016/0370-2693(95)01040-W PG 10 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA RY292 UT WOS:A1995RY29200032 ER PT J AU ABACHI, S ABBOTT, B ABOLINS, M ACHARYA, BS ADAM, I ADAMS, DL ADAMS, M AHN, S AIHARA, H ALITTI, J ALVAREZ, G ALVES, GA AMIDI, E AMOS, N ANDERSON, EW ARONSON, SH ASTUR, R AVERY, RE BADEN, A BALAMURALI, V BALDERSTON, J BALDIN, B BANTLY, J BARTLETT, JF BAZIZI, K BENDICH, J BERI, SB BERTRAM, I BEZZUBOV, VA BHAT, PC BHATNAGAR, V BHATTACHARJEE, M BISCHOFF, A BISWAS, N BLAZEY, G BLESSING, S BLOOM, P BOEHNLEIN, A BOJKO, NI BORCHERDING, F BORDERS, J BOSWELL, C BRANDT, A BROCK, R BROSS, A BUCHHOLZ, D BURTOVOI, VS BUTLER, JM CASEY, D CASTILLAVALDEZ, H CHAKRABORTY, D CHANG, SM CHEKULAEV, SV CHEN, LP CHEN, W CHEVALIER, L CHOPRA, S CHOUDHARY, BC CHRISTENSON, JH CHUNG, M CLAES, D CLARK, AR COBAU, WG COCHRAN, J COOPER, WE CRETSINGER, C CULLENVIDAL, D CUMMINGS, MAC CUTTS, D DAHL, OI DE, K DEMARTEAU, M DEMINA, R DENISENKO, K DENISENKO, N DENISOV, D DENISOV, SP DHARMARATNA, W DIEHL, HT DIESBURG, M DILORETO, G DIXON, R DRAPER, P DRINKARD, J DUCROS, Y DUGAD, SR DURSTONJOHNSON, S EDMUNDS, D ELLISON, J ELVIRA, VD ENGELMANN, R ENO, S EPPLEY, G ERMOLOV, P EROSHIN, OV EVDOKIMOV, VN FAHEY, S FAHLAND, T FATYGA, M FATYGA, MK FEATHERLY, J FEHER, S FEIN, D FERBEL, T FINOCCHIARO, G FISK, HE FISYAK, Y FLATTUM, E FORDEN, GE FORTNER, M FRAME, KC FRANZINI, P FUESS, S GALJAEV, AN GALLAS, E GAO, CS GAO, S GELD, TL GENIK, RJ GENSER, K GERBER, CE GIBBARD, B GLEBOV, V GLENN, S GOBBI, B GOFORTH, M GOLDSCHMIDT, A GOMEZ, B GONCHAROV, PI GORDON, H GOSS, LT GRAF, N GRANNIS, PD GREEN, DR GREEN, J GREENLEE, H GRIFFIN, G GROSSMAN, N GRUDBERG, P GRUNENDAHL, S GU, W GUGLIELMO, G GUIDA, JA GUIDA, JM GURYN, W GURZHIEV, SN GUTIERREZ, P GUTNIKOV, YE HADLEY, NJ HAGGERTY, H HAGOPIAN, S HAGOPIAN, V HAHN, KS HALL, RE HANSEN, S HATCHER, R HAUPTMAN, JM HEDIN, D HEINSON, AP HEINTZ, U HERNANDEZMONTOYA, R HEURING, T HIROSKY, R HOBBS, JD HOENEISEN, B HOFTUN, JS HSIEH, F HU, T HU, T HUEHN, T IGARASHI, S ITO, AS JAMES, E JAQUES, J JERGER, SA JIANG, JZY JOFFEMINOR, T JOHARI, H JOHNS, K JOHNSON, M JOHNSTAD, H JONCKHEERE, A JONES, M JOSTLEIN, H JUN, SY JUNG, CK KAHN, S KALBFLEISCH, G KANG, JS KEHOE, R KELLY, ML KERNAN, A KERTH, L KIM, CL KIM, SK KLATCHKO, A KLIMA, B KLOCHKOV, BI KLOPFENSTEIN, C KLYUKHIN, VI KOCHETKOV, VI KOHLI, JM KOLTICK, D KOSTRITSKIY, AV KOTCHER, J KOURLAS, J KOZELOV, AV KOZLOVSKI, EA KRISHNASWAMY, MR KRZYWDZINSKI, S KUNORI, S LAMI, S LANDSBERG, G LANOU, RE LEBRAT, JF LEFLAT, A LI, H LI, J LI, YK LIDEMARTEAU, QZ LIMA, JGR LINCOLN, D LINN, SL LINNEMANN, J LIPTON, R LIU, YC LOBKOWICZ, F LOKEN, SC LOKOS, S LUEKING, L LYON, AL MACIEL, AKA MADARAS, RJ MADDEN, R MANDRICHENKO, IV MANGEOT, P MANI, S MANSOULIE, B MAO, HS MARGULIES, S MARKELOFF, R MARKOSKY, L MARSHALL, T MARTIN, MI MARX, M MAY, M MAYOROV, AA MCCARTHY, R MCKIBBEN, T MCKINLEY, J MCMAHON, T MELANSON, HL NETO, JRTD MERRITT, KW MIETTINEN, H MILDER, A MINCER, A DEMIRANDA, JM MISHRA, CS MOHAMMADIBAARMAND, M MOKHOV, N MONDAL, NK MONTGOMERY, HE MOONEY, P MUDAN, M MURPHY, C MURPHY, CT NANG, F NARAIN, M NARASIMHAM, VS NARAYANAN, A NEAL, HA NEGRET, JP NEIS, E NEMETHY, P NESIC, D NORMAN, D OESCH, L OGURI, V OLTMAN, E OSHIMA, N OWEN, D PATERNO, M PERKINS, J PODSTAVKOV, VM POPE, BG PROSPER, HB PROTOPOPESCU, S PUSELJIC, D QIAN, J QUINTAS, PZ RAJA, R RAJAGOPALAN, S RAMIREZ, O RAO, MVS RAPIDIS, PA RASMUSSEN, L READ, AL REUCROFT, S RIJSSENBEEK, M ROCKWELL, T ROE, NA RUBINOV, P RUCHTI, R RUSIN, S RUTHERFOORD, J SANTORO, A SAWYER, L SCHAMBERGER, RD SCHELLMAN, H SCULLI, J SHABALINA, E SHAFFER, C SHANKAR, HC SHIVPURI, RK SHUPE, M SINGH, JB SIROTENKO, V SMART, W SMITH, A SMITH, RP SNIHUR, R SNOW, GR SNYDER, S SOLOMON, J SOOD, PM SOSEBEE, M SOUZA, M SPADAFORA, AL STEPHENS, RW STEVENSON, ML STEWART, D STOIANOVA, DA STOKER, D STREETS, K STROVINK, M TAKETANI, A TAMBURELLO, P TARAZI, J TARTAGLIA, M TAYLOR, TL TEIGER, J THOMPSON, J TRIPPE, TG TUTS, PM VARELAS, N VARNES, EW VIRADOR, PRG VITITOE, D VOLKOV, AA VOROBIEV, AP WAHL, HD WANG, G WANG, J WANG, LZ WARCHOL, J WAYNE, M WEERTS, H WEN, F WENZEL, WA WHITE, A WHITE, JT WIGHTMAN, JA WILCOX, J WILLIS, S WIMPENNY, SJ WIRJAWAN, JVD WOMERSLEY, J WON, E WOOD, DR XU, H YAMADA, R YAMIN, P YANAGISAWA, C YANG, J YASUDA, T YEPES, P YOSHIKAWA, C YOUSSEF, S YU, J YU, Y ZHANG, Y ZHOU, YH ZHU, Q ZHU, YS ZHU, ZH ZIEMINSKA, D ZIEMINSKI, A ZYLBERSTEJN, A AF ABACHI, S ABBOTT, B ABOLINS, M ACHARYA, BS ADAM, I ADAMS, DL ADAMS, M AHN, S AIHARA, H ALITTI, J ALVAREZ, G ALVES, GA AMIDI, E AMOS, N ANDERSON, EW ARONSON, SH ASTUR, R AVERY, RE BADEN, A BALAMURALI, V BALDERSTON, J BALDIN, B BANTLY, J BARTLETT, JF BAZIZI, K BENDICH, J BERI, SB BERTRAM, I BEZZUBOV, VA BHAT, PC BHATNAGAR, V BHATTACHARJEE, M BISCHOFF, A BISWAS, N BLAZEY, G BLESSING, S BLOOM, P BOEHNLEIN, A BOJKO, NI BORCHERDING, F BORDERS, J BOSWELL, C BRANDT, A BROCK, R BROSS, A BUCHHOLZ, D BURTOVOI, VS BUTLER, JM CASEY, D CASTILLAVALDEZ, H CHAKRABORTY, D CHANG, SM CHEKULAEV, SV CHEN, LP CHEN, W CHEVALIER, L CHOPRA, S CHOUDHARY, BC CHRISTENSON, JH CHUNG, M CLAES, D CLARK, AR COBAU, WG COCHRAN, J COOPER, WE CRETSINGER, C CULLENVIDAL, D CUMMINGS, MAC CUTTS, D DAHL, OI DE, K DEMARTEAU, M DEMINA, R DENISENKO, K DENISENKO, N DENISOV, D DENISOV, SP DHARMARATNA, W DIEHL, HT DIESBURG, M DILORETO, G DIXON, R DRAPER, P DRINKARD, J DUCROS, Y DUGAD, SR DURSTONJOHNSON, S EDMUNDS, D ELLISON, J ELVIRA, VD ENGELMANN, R ENO, S EPPLEY, G ERMOLOV, P EROSHIN, OV EVDOKIMOV, VN FAHEY, S FAHLAND, T FATYGA, M FATYGA, MK FEATHERLY, J FEHER, S FEIN, D FERBEL, T FINOCCHIARO, G FISK, HE FISYAK, Y FLATTUM, E FORDEN, GE FORTNER, M FRAME, KC FRANZINI, P FUESS, S GALJAEV, AN GALLAS, E GAO, CS GAO, S GELD, TL GENIK, RJ GENSER, K GERBER, CE GIBBARD, B GLEBOV, V GLENN, S GOBBI, B GOFORTH, M GOLDSCHMIDT, A GOMEZ, B GONCHAROV, PI GORDON, H GOSS, LT GRAF, N GRANNIS, PD GREEN, DR GREEN, J GREENLEE, H GRIFFIN, G GROSSMAN, N GRUDBERG, P GRUNENDAHL, S GU, W GUGLIELMO, G GUIDA, JA GUIDA, JM GURYN, W GURZHIEV, SN GUTIERREZ, P GUTNIKOV, YE HADLEY, NJ HAGGERTY, H HAGOPIAN, S HAGOPIAN, V HAHN, KS HALL, RE HANSEN, S HATCHER, R HAUPTMAN, JM HEDIN, D HEINSON, AP HEINTZ, U HERNANDEZMONTOYA, R HEURING, T HIROSKY, R HOBBS, JD HOENEISEN, B HOFTUN, JS HSIEH, F HU, T HU, T HUEHN, T IGARASHI, S ITO, AS JAMES, E JAQUES, J JERGER, SA JIANG, JZY JOFFEMINOR, T JOHARI, H JOHNS, K JOHNSON, M JOHNSTAD, H JONCKHEERE, A JONES, M JOSTLEIN, H JUN, SY JUNG, CK KAHN, S KALBFLEISCH, G KANG, JS KEHOE, R KELLY, ML KERNAN, A KERTH, L KIM, CL KIM, SK KLATCHKO, A KLIMA, B KLOCHKOV, BI KLOPFENSTEIN, C KLYUKHIN, VI KOCHETKOV, VI KOHLI, JM KOLTICK, D KOSTRITSKIY, AV KOTCHER, J KOURLAS, J KOZELOV, AV KOZLOVSKI, EA KRISHNASWAMY, MR KRZYWDZINSKI, S KUNORI, S LAMI, S LANDSBERG, G LANOU, RE LEBRAT, JF LEFLAT, A LI, H LI, J LI, YK LIDEMARTEAU, QZ LIMA, JGR LINCOLN, D LINN, SL LINNEMANN, J LIPTON, R LIU, YC LOBKOWICZ, F LOKEN, SC LOKOS, S LUEKING, L LYON, AL MACIEL, AKA MADARAS, RJ MADDEN, R MANDRICHENKO, IV MANGEOT, P MANI, S MANSOULIE, B MAO, HS MARGULIES, S MARKELOFF, R MARKOSKY, L MARSHALL, T MARTIN, MI MARX, M MAY, M MAYOROV, AA MCCARTHY, R MCKIBBEN, T MCKINLEY, J MCMAHON, T MELANSON, HL NETO, JRTD MERRITT, KW MIETTINEN, H MILDER, A MINCER, A DEMIRANDA, JM MISHRA, CS MOHAMMADIBAARMAND, M MOKHOV, N MONDAL, NK MONTGOMERY, HE MOONEY, P MUDAN, M MURPHY, C MURPHY, CT NANG, F NARAIN, M NARASIMHAM, VS NARAYANAN, A NEAL, HA NEGRET, JP NEIS, E NEMETHY, P NESIC, D NORMAN, D OESCH, L OGURI, V OLTMAN, E OSHIMA, N OWEN, D PATERNO, M PERKINS, J PODSTAVKOV, VM POPE, BG PROSPER, HB PROTOPOPESCU, S PUSELJIC, D QIAN, J QUINTAS, PZ RAJA, R RAJAGOPALAN, S RAMIREZ, O RAO, MVS RAPIDIS, PA RASMUSSEN, L READ, AL REUCROFT, S RIJSSENBEEK, M ROCKWELL, T ROE, NA RUBINOV, P RUCHTI, R RUSIN, S RUTHERFOORD, J SANTORO, A SAWYER, L SCHAMBERGER, RD SCHELLMAN, H SCULLI, J SHABALINA, E SHAFFER, C SHANKAR, HC SHIVPURI, RK SHUPE, M SINGH, JB SIROTENKO, V SMART, W SMITH, A SMITH, RP SNIHUR, R SNOW, GR SNYDER, S SOLOMON, J SOOD, PM SOSEBEE, M SOUZA, M SPADAFORA, AL STEPHENS, RW STEVENSON, ML STEWART, D STOIANOVA, DA STOKER, D STREETS, K STROVINK, M TAKETANI, A TAMBURELLO, P TARAZI, J TARTAGLIA, M TAYLOR, TL TEIGER, J THOMPSON, J TRIPPE, TG TUTS, PM VARELAS, N VARNES, EW VIRADOR, PRG VITITOE, D VOLKOV, AA VOROBIEV, AP WAHL, HD WANG, G WANG, J WANG, LZ WARCHOL, J WAYNE, M WEERTS, H WEN, F WENZEL, WA WHITE, A WHITE, JT WIGHTMAN, JA WILCOX, J WILLIS, S WIMPENNY, SJ WIRJAWAN, JVD WOMERSLEY, J WON, E WOOD, DR XU, H YAMADA, R YAMIN, P YANAGISAWA, C YANG, J YASUDA, T YEPES, P YOSHIKAWA, C YOUSSEF, S YU, J YU, Y ZHANG, Y ZHOU, YH ZHU, Q ZHU, YS ZHU, ZH ZIEMINSKA, D ZIEMINSKI, A ZYLBERSTEJN, A TI SEARCH FOR HEAVY W-BOSONS IN 1.8 TEV P(P)OVER-BAR COLLISIONS SO PHYSICS LETTERS B LA English DT Article ID RIGHT-HANDED CURRENTS; PARTON DISTRIBUTIONS; MUON DECAY; MODELS; BOUNDS; LIMITS; MASS AB A search for a heavy charged gauge boson, W', using the decay channels W' --> e nu and W' --> tau nu --> e nu nu nu is reported. The data used in the analysis were collected by the DO experiment at the Fermilab Tevatron during the 1992-93 p ($) over bar p collider run from an integrated luminosity of 13.9 +/- 0.8 pb(-1) at root s = 1.8 TeV. Assuming that the neutrino from W' decay is stable and has a mass significantly less than m(w)', an upper limit at the 95% confidence level is set on the cross section times branching ratio for p ($) over bar p --> W' --> e nu. A W' with the same couplings to quarks and leptons as the standard model W boson is excluded for m(W)' < 610 GeV/c(2). C1 UNIV CALIF DAVIS, DAVIS, CA 95616 USA. UNIV CALIF IRVINE, IRVINE, CA 92717 USA. UNIV CALIF RIVERSIDE, RIVERSIDE, CA 92521 USA. CTR BRASILEIRO PESQUISAS FIS, LAFEX, RIO DE JANEIRO, BRAZIL. CINVESTAV IPN, MEXICO CITY, DF, MEXICO. COLUMBIA UNIV, NEW YORK, NY 10027 USA. UNIV DELHI, DELHI 110007, INDIA. FLORIDA STATE UNIV, TALLAHASSEE, FL 32306 USA. UNIV HAWAII, HONOLULU, HI 96822 USA. UNIV ILLINOIS, CHICAGO, IL 60607 USA. INDIANA UNIV, BLOOMINGTON, IN 47405 USA. IOWA STATE UNIV SCI & TECHNOL, AMES, IA 50011 USA. KOREA UNIV, SEOUL 136701, SOUTH KOREA. KYUNGSUNG UNIV, PUSAN, SOUTH KOREA. UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. UNIV MARYLAND, COLLEGE PK, MD 20742 USA. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. MICHIGAN STATE UNIV, E LANSING, MI 48824 USA. MOSCOW MV LOMONOSOV STATE UNIV, MOSCOW, RUSSIA. UNIV NEBRASKA, LINCOLN, NE 68588 USA. NYU, NEW YORK, NY 10003 USA. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. NO ILLINOIS UNIV, DE KALB, IL 60115 USA. NORTHWESTERN UNIV, EVANSTON, IL 60208 USA. UNIV NOTRE DAME, NOTRE DAME, IN 46556 USA. UNIV OKLAHOMA, NORMAN, OK 73019 USA. PUNJABI UNIV, CHANDIGARH 160014, INDIA. INST HIGH ENERGY PHYS, PROTVINO 142284, RUSSIA. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. RICE UNIV, HOUSTON, TX 77251 USA. UNIV ROCHESTER, ROCHESTER, NY 14627 USA. CENS, CEA, DAPNIA, SERV PHYS PARTICULES, GIF SUR YVETTE, FRANCE. SEOUL NATL UNIV, SEOUL, SOUTH KOREA. SUNY STONY BROOK, STONY BROOK, NY 11794 USA. SSC LAB, DALLAS, TX 75237 USA. TATA INST FUNDAMENTAL RES, BOMBAY 400005, MAHARASHTRA, INDIA. UNIV TEXAS, ARLINGTON, TX 76019 USA. TEXAS A&M UNIV, COLLEGE STN, TX 77843 USA. UNIV LOS ANDES, BOGOTA, COLOMBIA. UNIV ARIZONA, TUCSON, AZ 85721 USA. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. BROWN UNIV, PROVIDENCE, RI 02912 USA. RP FERMILAB NATL ACCELERATOR LAB, POB 500, BATAVIA, IL 60510 USA. RI Aihara, Hiroaki/F-3854-2010; Shivpuri, R K/A-5848-2010; Gutierrez, Phillip/C-1161-2011; Leflat, Alexander/D-7284-2012; Klyukhin, Vyacheslav/D-6850-2012; De, Kaushik/N-1953-2013; Oguri, Vitor/B-5403-2013; Alves, Gilvan/C-4007-2013; Kim, Sun Kee/G-2042-2015; Chekulaev, Sergey/O-1145-2015; de Mello Neto, Joao/C-5822-2013; Taketani, Atsushi/E-1803-2017 OI Aihara, Hiroaki/0000-0002-1907-5964; Klyukhin, Vyacheslav/0000-0002-8577-6531; De, Kaushik/0000-0002-5647-4489; Kim, Sun Kee/0000-0002-0013-0775; de Mello Neto, Joao/0000-0002-3234-6634; Taketani, Atsushi/0000-0002-4776-2315 NR 25 TC 11 Z9 11 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD SEP 28 PY 1995 VL 358 IS 3-4 BP 405 EP 411 DI 10.1016/0370-2693(95)01029-P PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA RY292 UT WOS:A1995RY29200034 ER PT J AU REGER, DL MYERS, SM MASON, SS RHEINGOLD, AL HAGGERTY, BS ELLIS, PD AF REGER, DL MYERS, SM MASON, SS RHEINGOLD, AL HAGGERTY, BS ELLIS, PD TI SYNTHESES AND CD-113 NMR-STUDIES OF 5-COORDINATE COMPLEXES WITH CDN5, CDN3O2, AND CDN3S2 CENTRAL CORES - SOLID-STATE STRUCTURES OF [HB(3-PHPZ)(3)]CD[H2B(3,5-ME(2)PZ)(2)] AND [HB(3,5-ME(2)PZ)(3)]CD[S(2)CNET(2)] (PZ EQUALS PYRAZOLYL) SO INORGANIC CHEMISTRY LA English DT Article ID CD-113 NMR; POLYPYRAZOLYLBORATE LIGANDS; SPECTROSCOPY; CHEMISTRY; RING AB The reaction of CdCl2 with equimolar amounts of K[HB(3,5-Me(2)pz)(3)] (pz = pyrazolyl) and K[H2B(3,5-Me(2)pz)(2)] or K[HB(3-Phpz)(3)] and either K[H2B(pz)(2)] or K[H2B(3,5-Me(2)pz)(2)] yields, respectively, the five-coordinate complexes [HB(3,5-Me(2)pz)(3)]Cd[H2B(3,5-Me(2)pz)(2)] (1), [HB(3-Phpz)(3)]Cd[H2B(pz)(2)] (2), and [HB(3-Phpz)(3)]Cd[H2B(3,5-Me(2)pz)(2)] (3). The structure of 3 has been characterized in the solid state by X-ray crystallography. The complex has a square pyramidal arrangement of the nitrogen donor atoms about cadmium. Solution state H-1 NMR studies indicate that this geometry is retained in solution. Complexes 1-3 show solution Cd-113 NMR resonances in the range delta 193.6-224.3 ppm (vs Cd(ClO4)(2)). The complexes containing the [HB(3-Phpz)(3)](-) ligand have the more shielded resonances. This range overlaps the region observed for poly(pyrazolyl)borate complexes with CdN6 inner cores (delta 94.0-221.1 ppm). Six complexes with a CdN3O2 inner core of the formula [HB(3-Phpz)(3)]Cd[(RCO)(2)CH] (R = Bu(t), Ph, CF3), [HB(3-Bu(t)pz)(3)]Cd[(Bu(t)CO)(2)CH], [B(3-Pr(i)pz)(4)]Cd[(Bu(t)CO)(2)CH], and [HB(3-Bu(t)pz)(3)]Cd(CH3CO2) have been prepared by the reaction of CdCl2 or Cd(NO3)(2) and the appropriate ligand salts. These complexes show solution Cd-113 NMR resonances in the range delta 141.8-179.8 ppm, with the [(Bu(t)CO)(2)CH](-) ligand complexes the most deshielded and [HB(3-Phpz)(3)]Cd[(CF3CO)(2)CH] the most shielded. Two complexes with N3S2 inner cores, [HB(3,5-Me(2)pz)(3)]Cd[Et(2)NCS(2)] (10) and [HB(3-Phpz)(3)]Cd[Et(2)NCS(2)] (11), have been prepared. The structure of 10 has been determined by X-ray crystallography. The donor atoms are arranged about cadmium in an irregular five-coordinate geometry. Complex 10 shows a solution Cd-113 signal at delta 265.7 and 11 at 237.5 ppm. Crystal data: [HB(3-Phpz)(3)]Cd[H2B(3,5-Me(2)pz)(2)], triclinic, P (1) over bar, a = 11.713(3) Angstrom b = 12.785(3) Angstrom, c = 12.922(4) Angstrom, alpha = 102.57(3)degrees, beta = 104.53(3)degrees, gamma = 91.83(4)degrees, V = 1821(9) Angstrom(3), Z = 2, T = 298 K, R(F) = 3.74%; [HB(3,5-Me(2)pz)(3)]Cd[Et(2)NCS(2)], monoclinic, P2(1)/c, a = 16.707(7) Angstrom, b = 8.197(5) Angstrom, c = 20.280(11) Angstrom, beta = 111.06(4)degrees, V = 2584(5) Angstrom(3), Z = 4, T = 296 K, R(F) = 3.70%. C1 UNIV DELAWARE, DEPT CHEM & BIOCHEM, NEWARK, DE 19716 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP REGER, DL (reprint author), UNIV S CAROLINA, DEPT CHEM & BIOCHEM, COLUMBIA, SC 29208 USA. OI Reger, Daniel/0000-0002-1525-7066 NR 28 TC 43 Z9 43 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD SEP 27 PY 1995 VL 34 IS 20 BP 4996 EP 5002 DI 10.1021/ic00124a014 PG 7 WC Chemistry, Inorganic & Nuclear SC Chemistry GA RY384 UT WOS:A1995RY38400014 ER PT J AU DONG, ZC CORBETT, JD AF DONG, ZC CORBETT, JD TI K18TL20AU3 - A NOVEL DERIVATIVE OF K8TL11 WITH THE UNPRECEDENTED POLYANION TL9AU29-, THE PARENT TL-11(7-), AND AN ISOLATED AU- ION SO INORGANIC CHEMISTRY LA English DT Article ID TRANSITION-ELEMENTS; CRYSTAL-STRUCTURE; CLUSTERS; CHEMISTRY; SYSTEM; K8IN11; PHASE; GOLD AB Attempts to derivatize the novel Tl-11(7-) ions in K8Tl11 by Au substitution leads to the formation of the title compound from direct reaction of the elements in Ta tubing at 500 and then 350 degrees C. The crystal structure was established at room temperature by single crystal X-ray diffraction means (space group P (6) over bar m2, Z = 1, a = 10.880 (1), c = 14.552 (2) Angstrom, R/R(w) = 3.8/4.0% for 52 variables and 703 independent reflections). The compound contains separate close-packed layers of Tl9Au2 and Tl-11 clusters, each with D-3h point symmetry, together with isolated Au atoms and 18 K atoms that sheath and separate the units. The gold-containing cluster can be derived directly from the pentacapped trigonal prismatic Tl-11 through substitution on the two apical (axial) positions followed by a substantial axial compression to generate an Au-Au bond, d = 2.963 Angstrom, this action causing the antisymmetric equivalent MO a(2)'' to become strongly antibonding and empty. The Tl-9 portion of the cluster is otherwise slightly perturbed. EHMO calculations indicate closed shell configurations for Tl9Au(2)(9-) and, as before, Tl-11(7-), leading to formulation of the compound as (Ki)(18)(Tl9Au29-)(Tl-11(7-))(Au-)e(-). The phase is appropriately a metallic conductor (rho(290) similar to 43 mu Omega . cm) and Pauli-paramagnetic, although some localization below 100 K is suggested by its Curie-Weiss behavior. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 44 TC 32 Z9 32 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD SEP 27 PY 1995 VL 34 IS 20 BP 5042 EP 5048 DI 10.1021/ic00124a020 PG 7 WC Chemistry, Inorganic & Nuclear SC Chemistry GA RY384 UT WOS:A1995RY38400020 ER PT J AU CHEUNG, YS CHEN, YJ NG, CY CHIU, SW LI, WK AF CHEUNG, YS CHEN, YJ NG, CY CHIU, SW LI, WK TI COMBINING THEORY WITH EXPERIMENT - ASSESSMENT OF THE THERMOCHEMISTRY OF SFN, SFN+, AND SFN-, N=1-6 SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID SULFUR-HEXAFLUORIDE; IONIZATION-ENERGY; GAUSSIAN-2 THEORY; SPARK BREAKDOWN; FRAGMENTATION; DISSOCIATION; SILICON; DECOMPOSITION; SPECTROSCOPY; PRODUCTS AB The Gaussian-2 [(G2) or G2(MP2)] ab initio quantum chemical calculations allow the examination of the consistency of experimental thermochemical data for SFn, SFn+, and SFn- (n = 1-6) in the literature. Based on comparisons between G2 and G2(MP2) theoretical predictions and experimental measurements, we recommend the following self-consistent set of experimental heats of formation at 0 K (Delta(f)H degrees(0)) for SFn, SFn+, and SFn- (n = 1-6): Delta(f)H degrees(0)(SF) = 2.9 +/- 1.4 kcal/mol, Delta(f)H degrees(0)(SF+) = 240.9 +/- 1.2 kcal/mol, Delta(f)H degrees(0)(SF-) = -43 +/- 13 kcal/mol, Delta(f)H degrees(0)(SF2) = -69.4 +/- 2.6 kcal/mol, Delta(f)H degrees(0)(SF2+) = 163.2 +/- 2.6 kcal/mol, Delta(f)H degrees(0)(SF3) = -103 +/- 5 kcal/mol, Delta(f)H degrees(0)(SF3+) = 85.6 +/- 5.0 kcal/mol, Delta(f)H degrees(0)(SF3-) = -174.5 +/- 6.8 kcal/mol, Delta(f)H degrees(0)(SF4) = -181 +/- 5 kcal/mol, Delta(f)H degrees(0)(SF4+) = 93 +/- 5 kcal/mol, Delta(f)H degrees(0)(SF4-) = -215.6 +/- 6.8 kcal/mol, Delta(f)H degrees(0)(SF5) = -205.9 +/- 3.4 kcal/mol, Delta(f)H degrees(0)(SF5+) = 15.5 +/- 3.6 kcal/mol, Delta(f)H degrees(0)(SF5-) = -291 +/- 5.7 kcal/mol, Delta(f)H degrees(0)(SF6) = -288.4 +/- 0.2 kcal/mol, and Delta(f)H degrees(0)(SF6-) = -314.5 +/- 2.4 kcal/mol. For Delta(f)H degrees(0)(SF2-), which is not known experimentally, we recommend a G2 value of -102.4 kcal/mol. At the MP2/6-31+G(d) level, SF6+ is found to be unstable with respect to dissociation forming lower sulfur fluoride cations. We have rationalized the theoretical structures for SFn, SFn+, and SFn- (n = 1-6) using the valence-shell-electron-pair-repulsion theory. The alternating patterns of high and low values observed for the SFn-1-F (n = 2-6), SFn-1+-F (n = 3-5), and SFn-1-F (n = 2-6) bond dissociation energies at 0 K and for the ionization energies and electron affinities of SFn (n = 1-6) are attributed to special stabilities for closed-shell molecular species, (SF3+, SF2, and SF-), (SF5+, SF4, and SF3-), and (SF6 and SF5-), with fully-filled 8, 10, and 12 valence electron shells around the central S atoms, respectively. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. US DOE,AMES LAB,AMES,IA 50011. UNIV ILLINOIS,CTR BIOTECHNOL,URBANA,IL 61801. UNIV ILLINOIS,NATL CTR SUPERCOMP APPLICAT,CHAMPAIGN,IL 61820. CHINESE UNIV HONG KONG,DEPT CHEM,SHA TIN,HONG KONG. RI Chen, Yu-Ju/E-9481-2015 NR 62 TC 67 Z9 67 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD SEP 27 PY 1995 VL 117 IS 38 BP 9725 EP 9733 DI 10.1021/ja00143a016 PG 9 WC Chemistry, Multidisciplinary SC Chemistry GA RX712 UT WOS:A1995RX71200016 ER PT J AU WILBANKS, SM CHEN, LL TSURUTA, H HODGSON, KO MCKAY, DB AF WILBANKS, SM CHEN, LL TSURUTA, H HODGSON, KO MCKAY, DB TI SOLUTION SMALL-ANGLE X-RAY-SCATTERING STUDY OF THE MOLECULAR CHAPERONE HSC70 AND ITS SUBFRAGMENTS SO BIOCHEMISTRY LA English DT Article ID SHOCK COGNATE PROTEIN; HEAT-SHOCK; ATP HYDROLYSIS; PEPTIDE-BINDING; ESCHERICHIA-COLI; UNCOATING ATPASE; STRESS PROTEINS; ACTIVE-SITE; DNAK; FRAGMENT AB Solution X-ray scattering experiments have been carried out on recombinant bovine Hsc70 (with 650 amino acid residues), a 60 kDa subfragment (residues 1-554) which has ATPase- and peptide-binding activities, a 44kDa subfragment (residues 1-386) which has only ATPase activity, and a peptide-binding fragment (residues 388-554). Modeling based on steady-state values of radii of gyration (R(g)'s) and P(r) functions shows that the 44 kDa and peptide-binding domains are oblate fragments while Hsc70 and the 60 kDa fragment are prolate and relatively elongated. R(g) values decrease significantly in the presence of MgATP relative to their values in the presence of MgADP (Delta R(g) similar to 4-5 Angstrom) for Hsc70 and the 60 kDa fragment; in contrast, they are essentially equal in the presence of either nucleotide for the 44 kDa ATPase fragment. The kinetics of the change of R(g) for Hsc70 and the 60 kDa fragment under single-ATPase cycle conditions show that the transition to the ATP-induced R(g) occurs significantly more rapidly than ATP hydrolysis while the reverse transition to the larger R(g) value does not occur before product release. Altogether, the solution scattering data support a model in which a conformational change in Hsc70 (presumably to the low-peptide-affinity state) is predicated on ATP binding while the reverse transition is predicated on product release. C1 STANFORD UNIV,SCH MED,DEPT BIOL STRUCT,BECKMAN LABS STRUCT BIOL,STANFORD,CA 94305. STANFORD UNIV,DEPT CHEM,STANFORD,CA 94305. STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94305. FU NCRR NIH HHS [RR-01209]; NIGMS NIH HHS [GM-39928] NR 36 TC 85 Z9 88 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD SEP 26 PY 1995 VL 34 IS 38 BP 12095 EP 12106 DI 10.1021/bi00038a002 PG 12 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA RX235 UT WOS:A1995RX23500002 PM 7547949 ER PT J AU PERSENGIEV, SP SAFFER, JD KILPATRICK, DL AF PERSENGIEV, SP SAFFER, JD KILPATRICK, DL TI AN ALTERNATIVELY SPLICED FORM OF THE TRANSCRIPTION FACTOR SP1 CONTAINING ONLY A SINGLE GLUTAMINE-RICH TRANSACTIVATION DOMAIN SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID GENE; RAT; ACTIVATION; ELEMENT; CREM; PROTEINS; SEQUENCE; SITES AB Protein-protein interactions involving specific transactivation domains play a central role in gene transcription and its regulation. The promoter-specific transcription factor Spl contains two glutamine-rich transcriptional activation domains (A and B) that mediate direct interactions with the transcription factor TFIID complex associated with RNA polymerase II and synergistic effects involving multiple Spl molecules. In the present study, we report the complementary DNA sequence for an alternatively spliced form of mouse Spf (mSp1-S) that lacks one of the two glutamine-rich activation regions present in the full-length protein. Corresponding transcripts were identified in mouse tissues and cell lines, and an Spl-related protein identical in size to that predicted for mSp1-S was detected in mouse nuclear extracts. Cotransfection analysis revealed that mSp1-S lacks appreciable activity at promoters containing a single Spl response element but is active when multiple Spl sites are present, suggesting synergistic interactions between multiple mSp1-S molecules. The absence of a single glutamine-rich domain does not fully explain the properties of the Smaller protein and indicates that additional structural features account for its unique transcriptional activity, The functional implications of this alternatively spliced form of Spl are discussed. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP PERSENGIEV, SP (reprint author), WORCESTER FDN BIOMED RES, 222 MAPLE AVE, SHREWSBURY, MA 01545 USA. FU NIDDK NIH HHS [DK36468]; NIEHS NIH HHS [ES07122] NR 32 TC 35 Z9 36 U1 0 U2 0 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD SEP 26 PY 1995 VL 92 IS 20 BP 9107 EP 9111 DI 10.1073/pnas.92.20.9107 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA RX200 UT WOS:A1995RX20000021 PM 7568082 ER PT J AU TOLMAN, JR FLANAGAN, JM KENNEDY, MA PRESTEGARD, JH AF TOLMAN, JR FLANAGAN, JM KENNEDY, MA PRESTEGARD, JH TI NUCLEAR MAGNETIC DIPOLE INTERACTIONS IN FIELD-ORIENTED PROTEINS - INFORMATION FOR STRUCTURE DETERMINATION IN SOLUTION SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE MYOGLOBIN; NMR; PARAMAGNETIC PROTEINS ID RESONANCE; NMR; CYANOMETMYOGLOBIN AB The measurement of dipolar contributions to the splitting of N-15 resonances of H-1-N-15 amide pairs in multidimensional high-field NMR spectra of field-oriented cyanometmyoglobin is reported. The splittings appear as small field dependent perturbations of normal scalar couplings. Assignment of more than 90 resonances to specific sequential sites in the protein allows correlation of the dipolar contributions with predictions based on the known susceptibility and known structure of the protein. Implications as an additional source of information for protein structure determination in solution are discussed. C1 BROOKHAVEN NATL LAB, DEPT BIOL, UPTON, NY 11973 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP TOLMAN, JR (reprint author), YALE UNIV, DEPT CHEM, 225 PROSPECT ST, NEW HAVEN, CT 06520 USA. FU NIGMS NIH HHS [GM33225] NR 18 TC 686 Z9 691 U1 1 U2 26 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD SEP 26 PY 1995 VL 92 IS 20 BP 9279 EP 9283 DI 10.1073/pnas.92.20.9279 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA RX200 UT WOS:A1995RX20000056 PM 7568117 ER PT J AU DIMRI, GP LEE, XH BASILE, G ACOSTA, M SCOTT, C ROSKELLEY, C MEDRANO, EE LINSKENS, M RUBELJ, I PEREIRASMITH, O PEACOCKE, M CAMPISI, J AF DIMRI, GP LEE, XH BASILE, G ACOSTA, M SCOTT, C ROSKELLEY, C MEDRANO, EE LINSKENS, M RUBELJ, I PEREIRASMITH, O PEACOCKE, M CAMPISI, J TI A BIOMARKER THAT IDENTIFIES SENESCENT HUMAN-CELLS IN CULTURE AND IN AGING SKIN IN-VIVO SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE REPLICATIVE SENESCENCE; TUMOR SUPPRESSION; BETA-GALACTOSIDASE ID REPLICATIVE SENESCENCE; CELLULAR SENESCENCE; LIFE-SPAN; INVITRO; FIBROBLASTS; AGE; INVIVO; DONORS AB Normal somatic cells invariably enter a state of irreversibly arrested growth and altered function after a finite number of divisions. This process, termed replicative senescence, is thought to be a tumor-suppressive mechanism and an underlying cause of aging. There is ample evidence that escape from senescence, or immortality, is important for malignant transformation. By contrast, the role of replicative senescence in organismic aging is controversial. Studies on cells cultured from donors of different ages, genetic backgrounds, or species suggest that senescence occurs in vivo and that organismic lifespan and cell replicative lifespan are under common genetic control. However, senescent cells cannot be distinguished from quiescent or terminally differentiated cells in tissues. Thus, evidence that senescent cells exist and accumulate with age in vivo is lacking. We show that several human cells express a beta-galactosidase, histochemically detectable at pH 6, upon senescence in culture. This marker was expressed by senescent, but not presenescent, fibroblasts and keratinocytes but was absent from quiescent fibroblasts and terminally differentiated keratinocytes. It was also absent from immortal cells but was induced by genetic manipulations that reversed immortality. In skin samples from human donors of different age, there was an age-dependent increase in this marker in dermal fibroblasts and epidermal keratinocytes. This marker provides in situ evidence that senescent cells may exist and accumulate with age in vivo. C1 UNIV CALIF BERKELEY,DEPT CELL & MOLEC BIOL,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. TUFTS UNIV,NEW ENGLAND MED CTR,SCH MED,DEPT DERMATOL,BOSTON,MA 02111. UNIV ROCHESTER,SCH MED,DEPT DERMATOL & PATHOL,ROCHESTER,NY 14642. BAYLOR COLL MED,HUFFINGTON CTR AGING,DEPT CELL BIOL,HOUSTON,TX 77030. BAYLOR COLL MED,HUFFINGTON CTR AGING,DIV MOLEC VIROL,HOUSTON,TX 77030. GERON CORP,MENLO PK,CA 94025. RI Roskelley, Calvin /F-4630-2011; Tang, Amy/L-3226-2016 OI Tang, Amy/0000-0002-5772-2878 FU NIA NIH HHS [AG09909, AG09927, AG11658] NR 31 TC 3815 Z9 3992 U1 25 U2 182 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD SEP 26 PY 1995 VL 92 IS 20 BP 9363 EP 9367 DI 10.1073/pnas.92.20.9363 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA RX200 UT WOS:A1995RX20000073 PM 7568133 ER PT J AU ZHU, LD ZHAO, J WANG, F NORRIS, PE FOGARTY, GD STEINER, B LU, P KEAR, B KANG, SB GALLOIS, B SINCLAIR, M DIMOS, D CRONINGOLOMB, M AF ZHU, LD ZHAO, J WANG, F NORRIS, PE FOGARTY, GD STEINER, B LU, P KEAR, B KANG, SB GALLOIS, B SINCLAIR, M DIMOS, D CRONINGOLOMB, M TI EPITAXIAL ELECTROOPTICAL SRXBA1-XNB2O6 FILMS BY SINGLE-SOURCE PLASMA-ENHANCED METALORGANIC CHEMICAL-VAPOR-DEPOSITION SO APPLIED PHYSICS LETTERS LA English DT Article AB SrxBa1-xNb2O6 films have been epitaxially grown on MgO substrates by a single-source plasma-enhanced chemical vapor deposition (PE-CVD). Exceptionally high quality of the epitaxial films was observed as indicated by high-resolution synchrotron x-ray diffract ion imaging. The films exhibit waveguiding behavior with values of refractive index and the linear electro-optic coefficient r(51) close to those of bulk crystals. (C) 1995 American Institute of Physics. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RUTGERS STATE UNIV,NEW BRUNSWICK,NJ 08854. STEVENS INST TECHNOL,HOBOKEN,NJ 07030. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. TUFTS UNIV,CTR ELECTROOPT TECHNOL,MEDFORD,MA 02155. RP ZHU, LD (reprint author), NZ APPL TECHNOL CORP,CAMBRIDGE,MA 02139, USA. RI Cronin-Golomb, Mark/A-5430-2012 OI Cronin-Golomb, Mark/0000-0002-8936-4358 NR 11 TC 17 Z9 18 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 25 PY 1995 VL 67 IS 13 BP 1836 EP 1838 DI 10.1063/1.115419 PG 3 WC Physics, Applied SC Physics GA RW225 UT WOS:A1995RW22500014 ER PT J AU CHUI, HC HAMMONS, BE SIMMONS, JA HARFF, NE SHERWIN, ME AF CHUI, HC HAMMONS, BE SIMMONS, JA HARFF, NE SHERWIN, ME TI HIGH-QUALITY SINGLE AND DOUBLE 2-DIMENSIONAL ELECTRON GASES GROWN BY METALORGANIC VAPOR-PHASE EPITAXY SO APPLIED PHYSICS LETTERS LA English DT Article ID POINT CONTACTS; MOBILITY; HETEROSTRUCTURES; GAAS; WELL AB We demonstrate the metalorganic vapor phase epitaxy (MOVPE) growth of AlGaAs/GaAs two-dimensional electron gases (2DEGs) with mobilities as high as 786 000 cm(2)/V s at a carrier density of 3.0X10(11) cm(-2) at 0.3 K. The mobility figures of merit (mu/n(3/2)) for these 2DEGs are the highest reported to date for MOVPE materials. These 2DEGs also exhibit the fractional quantum Hall effect (FQHE) with minima in longitudinal resistance corresponding to Landau level filling factors 2/3, 4/3, and 5/3. The temperature dependence and carrier density dependence of mobility were characterized, and the mobility was found to vary linearly with carrier density, implying that the mobility is probably limited by background ionized impurity scattering. A delta-doped 2DEG was also compared with uniformly doped 2DEGs and was found to have a slightly higher mobility. Finally, we obtained high mobility in a coupled double 2DEG structure for 2D to 2D tunneling applications. (C) 1995 American Institute of Physics. RP CHUI, HC (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 23 TC 3 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 25 PY 1995 VL 67 IS 13 BP 1911 EP 1913 DI 10.1063/1.114374 PG 3 WC Physics, Applied SC Physics GA RW225 UT WOS:A1995RW22500040 ER PT J AU DEES, C TRAVIS, CC AF DEES, C TRAVIS, CC TI INCREASED P53 SITE-SPECIFIC DNA-BINDING IN CELLS PRODUCING MUTANT P53 SO CANCER LETTERS LA English DT Article DE P53; ACTIVATING MUTATIONS; CHEMOTHERAPY; MUTAGENS; TUMOR VIRULENCE ID WILD-TYPE P53; PROTEIN; GENE AB Chemotherapeutic and DNA-damaging agents were found to increase p53 site-specific DNA binding in human breast and rat liver epithelial WBrasII cells which produce mutant p53. Increased p53 site-specific DNA-binding by chemotherapeutic or DNA-damaging agents was also induced in transfected Saos-2 cells producing wild type or transforming mutant p53. Therefore, exposure of cells containing a transforming p53 mutant to chemotherapeutic or DNA-damaging agents may potentially enhance their transformation state and tumorigenic potential. RP DEES, C (reprint author), OAK RIDGE NATL LAB,DIV HLTH SCI RES,MOLEC TOXICOL GRP,POB 2008,4500S MS 6109,PO 2008,OAK RIDGE,TN 37831, USA. NR 16 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCI PUBL IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0304-3835 J9 CANCER LETT JI Cancer Lett. PD SEP 25 PY 1995 VL 96 IS 2 BP 225 EP 231 DI 10.1016/0304-3835(95)03936-Q PG 7 WC Oncology SC Oncology GA RZ941 UT WOS:A1995RZ94100011 PM 7585461 ER PT J AU RAJASEKARAN, JJ CURRO, JG HONEYCUTT, JD AF RAJASEKARAN, JJ CURRO, JG HONEYCUTT, JD TI THEORY FOR THE PHASE-BEHAVIOR OF POLYOLEFIN BLENDS - APPLICATION TO THE POLYETHYLENE/ISOTACTIC POLYPROPYLENE BLEND SO MACROMOLECULES LA English DT Article ID INTEGRAL-EQUATION THEORY; ANGLE NEUTRON-SCATTERING; POLYMER BLENDS; MELTS; FLUIDS; THERMODYNAMICS; LIQUIDS; CHAINS; MODEL; DIFFRACTION AB A microscopically realistic theory for modeling the structure, thermodynamics, and phase behavior of polyolefin blends is developed on the basis of the polymer reference interaction site model (PRISM theory). The thermodynamics of mixing is treated using perturbation theory with the corresponding athermal mixture as the reference system. As an illustration of the approach we modeled the polyethylene/isotactic polypropylene blend (PEA-PP). The polypropylene monomers were constructed from three independent interaction sites representing the CH2, CH, and CH3 united atom groups constituting the monomer. Likewise polyethylene monomers consisted of two identical interaction sites, each representing a CH2 moiety. The intramolecular structure functions, required as input to PRISM theory, were determined from single-chain Monte Carlo simulations using the rotational isomeric state approximation. The Suter-Flory rotational isomeric state parameters were used for isotactic polypropylene. PRISM theory was used to compute the ten independent intermolecular pair correlation functions needed to characterize the intermolecular packing of the athermal blend. The enthalpic contribution to the free energy was then computed from first-order perturbation theory. The entropy of mixing, heat of mixing, and spinodal curve were computed as a function of composition for the blend consisting of PE and i-PP chains of 200 monomer units. The blend was found to be highly incompatible with UCST behavior. Local or short range correlations were found to significantly increase the heat of mixing, resulting in critical temperatures approximately 10-15 times larger than predicted on the basis of Flory-Huggins theory under the assumption of random mixing. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. BIOSYM TECHNOL INC,SAN DIEGO,CA 92121. RP RAJASEKARAN, JJ (reprint author), UNIV NEW MEXICO,ADV MAT LAB,ALBUQUERQUE,NM 87106, USA. NR 57 TC 41 Z9 47 U1 1 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD SEP 25 PY 1995 VL 28 IS 20 BP 6843 EP 6853 DI 10.1021/ma00124a020 PG 11 WC Polymer Science SC Polymer Science GA RX357 UT WOS:A1995RX35700020 ER PT J AU VANALSTEN, JG SAUER, BB GOCHANOUR, CR FARON, KL DOZIER, WD AF VANALSTEN, JG SAUER, BB GOCHANOUR, CR FARON, KL DOZIER, WD TI INTERFACIAL BROADENING AND SELF-ADHESION OF SEGMENTED BLOCK-COPOLYMERS STUDIED BY NEUTRON REFLECTION SO MACROMOLECULES LA English DT Note ID ELASTOMERS; POLYMERS C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP VANALSTEN, JG (reprint author), DUPONT CO INC,CENT RES & DEV,WILMINGTON,DE 19880, USA. NR 17 TC 4 Z9 4 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD SEP 25 PY 1995 VL 28 IS 20 BP 7019 EP 7021 DI 10.1021/ma00124a045 PG 3 WC Polymer Science SC Polymer Science GA RX357 UT WOS:A1995RX35700045 ER PT J AU OOGURI, H VAFA, C AF OOGURI, H VAFA, C TI ALL LOOP N=2 STRING AMPLITUDES SO NUCLEAR PHYSICS B LA English DT Article ID 2-DIMENSIONAL QCD; SUPERSTRINGS; 2-LOOP; MODEL AB Using the N = 4 topological reformulation of N = 2 strings, we compute all loop partition function for special compactifications of N = 2 strings as a function of target moduli. We also reinterpret N = 4 topological amplitudes in terms of slightly modified N = 2 topological amplitudes. We present some preliminary evidence for the conjecture that N = 2 strings is the large N limit of Holomorphic Yang-Mills in four dimensions. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. HARVARD UNIV,LYMAN LAB PHYS,CAMBRIDGE,MA 02138. RP OOGURI, H (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,366 LE CONTE HALL,BERKELEY,CA 94720, USA. RI Ooguri, Hirosi/A-4407-2011; OI Ooguri, Hirosi/0000-0001-6021-3778 NR 33 TC 47 Z9 47 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD SEP 25 PY 1995 VL 451 IS 1-2 BP 121 EP 161 DI 10.1016/0550-3213(95)00365-Y PG 41 WC Physics, Particles & Fields SC Physics GA RW794 UT WOS:A1995RW79400007 ER PT J AU CORIANO, C WHITE, AR AF CORIANO, C WHITE, AR TI PROPERTIES OF THE SCALE-INVARIANT O(G(4)) LIPATOV KERNEL SO NUCLEAR PHYSICS B LA English DT Article ID QCD AB We study the scale-invariant O(g(4)) kernel which appears as an infra-red contribution in the BFKL evolution equation and is constructed via multiparticle t-channel unitarity. We detail the variety of Ward identity constraints and infra-red cancellations that characterize its infrared behaviour. We give an analytic form for the full non-forward kernel. For the forward kernel controlling parton evolution at small x, we give an impact parameter representation, derive the eigenvalue spectrum, and demonstrate a holomorphic factorisation property related to conformal invariance. The present results indicate that, at next-to-leading order, the transverse momentum infra-red region may produce a significant reduction of the BFKL small-x behavior. RP CORIANO, C (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. OI Coriano', Claudio/0000-0003-0479-8075 NR 19 TC 12 Z9 12 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD SEP 25 PY 1995 VL 451 IS 1-2 BP 231 EP 264 DI 10.1016/0550-3213(95)00353-T PG 34 WC Physics, Particles & Fields SC Physics GA RW794 UT WOS:A1995RW79400012 ER PT J AU OVCHINNIKOV, SY MACEK, JH AF OVCHINNIKOV, SY MACEK, JH TI ELECTRON-ENERGY AND ANGULAR-DISTRIBUTION THEORY FOR LOW-ENERGY ION-ATOM COLLISIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID STURMIAN EXPANSION; GREEN-FUNCTION; IONIZATION; HYDROGEN AB We present the first ab initio calculations of electron-energy and angular distributions of saddlepoint and S-promotion electrons for ionization in proton-hydrogen atom collisions. The calculations are based on outgoing wave Sturmian expansions in the frequency domain. They go beyond the usual Born-Oppenheimer separation of electron and nuclei motion and display the ''v/2'' peaks and the continuum capture cusps, missing in previous theories. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. AF IOFFE PHYS TECH INST,ST PETERSBURG 194021,RUSSIA. RP OVCHINNIKOV, SY (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. RI Ovchinnikov, Serguei/C-4994-2014 NR 18 TC 51 Z9 51 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 25 PY 1995 VL 75 IS 13 BP 2474 EP 2477 DI 10.1103/PhysRevLett.75.2474 PG 4 WC Physics, Multidisciplinary SC Physics GA RV950 UT WOS:A1995RV95000006 ER PT J AU STEWART, HB UEDA, Y GREBOGI, C YORKE, JA AF STEWART, HB UEDA, Y GREBOGI, C YORKE, JA TI DOUBLE CRISES IN 2-PARAMETER DYNAMICAL-SYSTEMS SO PHYSICAL REVIEW LETTERS LA English DT Article ID CHAOTIC ATTRACTORS; METAMORPHOSES; JUMPS AB A crisis is a sudden discontinuous change in a chaotic attractor as a system parameter is varied. We investigate phenomena observed when two parameters of a dissipative system are varied simultaneously, following a crisis along a curve in the parameter plane. Two such curves intersect at a point we call a double crisis vertex. The phenomena we study include the double crisis vertex at which an interior and a boundary crisis coincide, and related forms of double crisis. We show how an experimenter can infer a crisis from observations of other related crises at a vertex. C1 KYOTO UNIV,DEPT ELECT ENGN,KYOTO 606,JAPAN. UNIV MARYLAND,DEPT MATH,COLLEGE PK,MD 20742. UNIV MARYLAND,INST PHYS SCI & TECHNOL,COLLEGE PK,MD 20742. UNIV MARYLAND,PLASMA RES LAB,COLLEGE PK,MD 20742. RP STEWART, HB (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. NR 17 TC 34 Z9 34 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 25 PY 1995 VL 75 IS 13 BP 2478 EP 2481 DI 10.1103/PhysRevLett.75.2478 PG 4 WC Physics, Multidisciplinary SC Physics GA RV950 UT WOS:A1995RV95000007 ER PT J AU REGAN, MJ KAWAMOTO, EH LEE, S PERSHAN, PS MASKIL, N DEUTSCH, M MAGNUSSEN, OM OCKO, BM BERMAN, LE AF REGAN, MJ KAWAMOTO, EH LEE, S PERSHAN, PS MASKIL, N DEUTSCH, M MAGNUSSEN, OM OCKO, BM BERMAN, LE TI SURFACE LAYERING IN LIQUID GALLIUM - AN X-RAY REFLECTIVITY STUDY SO PHYSICAL REVIEW LETTERS LA English DT Article ID VAPOR INTERFACE; METAL SURFACES; DIFFRACTION AB Surface-induced atomic layering in liquid gallium has been observed using x-ray reflectivity, ultrahigh vacuum conditions, and sputtered clean surfaces. Reflectivity data, collected on a supercooled liquid sample to momentum transfers as large as q(z) = 3.0 Angstrom(-1), exhibit a strong maximum near 2.4 Angstrom(-1) indicating a layer spacing that is comparable to its atomic dimensions. The amplitude of the electron density oscillations decays with a characteristic length of 6 Angstrom. This is unexpectedly twice that of recent results for Hg, and the difference may be related to covalent bonding or supercooling. C1 HARVARD UNIV, DIV APPL SCI, CAMBRIDGE, MA 02138 USA. HARVARD UNIV, DEPT PHYS, CAMBRIDGE, MA 02138 USA. BAR ILAN UNIV, DEPT PHYS, IL-52100 RAMAT GAN, ISRAEL. BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. BROOKHAVEN NATL LAB, NATL SYNCHROTRON LIGHT SOURCE, UPTON, NY 11973 USA. NR 26 TC 206 Z9 208 U1 3 U2 19 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 25 PY 1995 VL 75 IS 13 BP 2498 EP 2501 DI 10.1103/PhysRevLett.75.2498 PG 4 WC Physics, Multidisciplinary SC Physics GA RV950 UT WOS:A1995RV95000012 ER PT J AU BONCA, J TRUGMAN, SA AF BONCA, J TRUGMAN, SA TI EFFECT OF INELASTIC PROCESSES ON TUNNELING SO PHYSICAL REVIEW LETTERS LA English DT Article ID DOUBLE-BARRIER; PHONON INTERACTION; SOLVABLE MODEL; HETEROSTRUCTURES AB We study an electron that interacts with phonons or other linear or nonlinear excitations as it resonantly tunnels. The method we use is based on mapping a many-body problem in a large variational space exactly onto a one-body problem. The method is conceptually simpler than previous Green's function approaches, and allows the essentially exact numerical solution of much more general problems. We solve tunneling problems with transverse channels, multiple sites coupled to phonons, and multiple phonon degrees of freedom and excitations. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. UNIV LJUBLJANA,JOZEF STEFAN INST,LJUBLJANA 61111,SLOVENIA. RP BONCA, J (reprint author), LOS ALAMOS NATL LAB,DIV THEORY,LOS ALAMOS,NM 87545, USA. NR 16 TC 131 Z9 132 U1 2 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 25 PY 1995 VL 75 IS 13 BP 2566 EP 2569 DI 10.1103/PhysRevLett.75.2566 PG 4 WC Physics, Multidisciplinary SC Physics GA RV950 UT WOS:A1995RV95000029 ER PT J AU KIMMEL, GA ORLANDO, TM AF KIMMEL, GA ORLANDO, TM TI LOW-ENERGY (5-120-EV) ELECTRON-STIMULATED DISSOCIATION OF AMORPHOUS D2O ICE - D(S-2), O(P-3(2,1,0), AND O(D-1(2)) YIELDS AND VELOCITY DISTRIBUTIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID ASTROPHYSICAL IMPLICATIONS; DESORPTION; H2O; WATER; IONIZATION; SPECTRA; GAS; NO; O2 AB Laser resonance enhanced multiphonon ionization spectroscopy was used to measure yields and velocity distributions of the D(S-2), O(P-3(2,1,0)), and O(D-1(2)) produced during low-energy (5-120 eV) electron-beam irradiation of amorphous D2O ice. Electron-stimulated dissociation has a very low energy threshold (similar to 6-7 eV), and the neutral fragments desorb with low kinetic energies (similar to 60-85 meV) which are independent of the incident electron energy. The data suggest that desorption of neutral fragments results from dissociation of excited states formed directly or via electron-ion recombination. C1 PACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, RICHLAND, WA 99352 USA. OI Kimmel, Greg/0000-0003-4447-2440 NR 24 TC 107 Z9 110 U1 2 U2 12 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 25 PY 1995 VL 75 IS 13 BP 2606 EP 2609 DI 10.1103/PhysRevLett.75.2606 PG 4 WC Physics, Multidisciplinary SC Physics GA RV950 UT WOS:A1995RV95000039 ER PT J AU VOGT, T GOLDMAN, A STERNLIEB, B STASSIS, C AF VOGT, T GOLDMAN, A STERNLIEB, B STASSIS, C TI OBSERVATION OF OSCILLATORY MAGNETIC ORDER IN THE ANTIFERROMAGNETIC SUPERCONDUCTOR HONI2BA2C - COMMENT SO PHYSICAL REVIEW LETTERS LA English DT Note C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP VOGT, T (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Vogt, Thomas /A-1562-2011 OI Vogt, Thomas /0000-0002-4731-2787 NR 6 TC 15 Z9 15 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 25 PY 1995 VL 75 IS 13 BP 2628 EP 2628 DI 10.1103/PhysRevLett.75.2628 PG 1 WC Physics, Multidisciplinary SC Physics GA RV950 UT WOS:A1995RV95000046 ER PT J AU LERNER, TJ BOUSTANY, RMN ANDERSON, JW DARIGO, KL SCHLUMPF, K BUCKLER, AJ GUSELLA, JF HAINES, JL KREMMIDIOTIS, G LENSINK, IL SUTHERLAND, GR CALLEN, DF TASCHNER, PEM DEVOS, N VANOMMEN, GJB BREUNING, MH DOGGETT, NA MEINCKE, LJ LIU, ZY GOODWIN, LA TESMER, JG MITCHISON, HM ORAWE, AM MUNROE, PB JARVELA, IE GARDINER, RM MOLE, SE AF LERNER, TJ BOUSTANY, RMN ANDERSON, JW DARIGO, KL SCHLUMPF, K BUCKLER, AJ GUSELLA, JF HAINES, JL KREMMIDIOTIS, G LENSINK, IL SUTHERLAND, GR CALLEN, DF TASCHNER, PEM DEVOS, N VANOMMEN, GJB BREUNING, MH DOGGETT, NA MEINCKE, LJ LIU, ZY GOODWIN, LA TESMER, JG MITCHISON, HM ORAWE, AM MUNROE, PB JARVELA, IE GARDINER, RM MOLE, SE TI ISOLATION OF A NOVEL GENE UNDERLYING BATTEN-DISEASE, CLN3 SO CELL LA English DT Article ID NEURONAL CEROID-LIPOFUSCINOSIS; MITOCHONDRIAL ATP SYNTHASE; HUMAN CHROMOSOME-16; LOCUS CLN3; PROTEIN; PEPTIDES; SITES; IDENTIFICATION; REQUIREMENTS; LOCALIZATION AB Batten disease (also known as juvenile neuronal ceroid lipofuscinosis) is a recessively inherited neurodegenerative disorder of childhood characterized by progressive loss of vision, seizures, and psychomotor disturbances. The Batten disease gene, CLN3, maps to chromosome 16p12.1. The so-called 56 chromosome haplotype defined by alleles at the D16S299 and D16S298 loci is shared by 73% of Batten disease chromosomes. Exon amplification of a cosmid containing D76S298 has yielded a candidate gene that is disrupted by a 1 kb genomic deletion in all patients carrying the 56 chromosome. Two separate deletions and a point mutation altering a splice site in three unrelated families have confirmed the candidate as the CLN3 gene. The disease gene encodes a novel 438 amino acid protein of unknown function. C1 HARVARD UNIV, SCH MED, DEPT NEUROL, BOSTON, MA 02114 USA. HARVARD UNIV, SCH MED, DEPT GENET, BOSTON, MA 02114 USA. DUKE UNIV, MED CTR, DIV PEDIAT NEUROL, DURHAM, NC 27710 USA. WOMENS & CHILDRENS HOSP, DEPT CYTOGENET & MOLEC GENET, ADELAIDE, SA 5006, AUSTRALIA. LEIDEN UNIV, DEPT HUMAN GENET, 2333 AL LEIDEN, NETHERLANDS. ERASMUS UNIV ROTTERDAM, DEPT CLIN GENET, 3015 GE ROTTERDAM, NETHERLANDS. LOS ALAMOS NATL LAB, DIV LIFE SCI, LOS ALAMOS, NM 87545 USA. LOS ALAMOS NATL LAB, CTR HUMAN GENOME STUDIES, LOS ALAMOS, NM 87545 USA. UCL, SCH MED, RAYNE INST, DEPT PEDIAT, LONDON WC1E 6JJ, ENGLAND. RP LERNER, TJ (reprint author), MASSACHUSETTS GEN HOSP, MOLEC NEUROGENET UNIT, BOSTON, MA 02129 USA. RI Mitchison, Hannah/C-1891-2008; Mole, Sara/C-2024-2008; Haines, Jonathan/C-3374-2012; Sutherland, Grant/D-2606-2012; Callen, David/G-1975-2012; Jarvela, Irma/L-5836-2013 NR 48 TC 356 Z9 359 U1 1 U2 22 PU CELL PRESS PI CAMBRIDGE PA 600 TECHNOLOGY SQUARE, 5TH FLOOR, CAMBRIDGE, MA 02139 USA SN 0092-8674 J9 CELL JI Cell PD SEP 22 PY 1995 VL 82 IS 6 BP 949 EP 957 DI 10.1016/0092-8674(95)90274-0 PG 9 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA RW693 UT WOS:A1995RW69300011 ER PT J AU HUANG, YH KOURI, DJ HOFFMAN, DK AF HUANG, YH KOURI, DJ HOFFMAN, DK TI DIRECT APPROACH TO DENSITY-FUNCTIONAL THEORY - ITERATIVE TREATMENT USING A POLYNOMIAL REPRESENTATION OF THE HEAVISIDE STEP-FUNCTION OPERATOR SO CHEMICAL PHYSICS LETTERS LA English DT Article ID APPROXIMATING FUNCTION-THEORY; MOLECULAR-DYNAMICS; FORMALISM; ENERGY AB A new approach to density functional theory is presented. The ground state electronic density and energy of a many-electron system are obtained directly using a polynomial representation of the Heaviside step operator acting on a trial wavefunction. A radial coordinate extension of the distributed approximating functional (DAF) is developed to treat Coulomb singularities and cusps accurately. Examples of electronic structure for the He and Ne atomic systems are presented. C1 UNIV HOUSTON, DEPT PHYS, HOUSTON, TX 77204 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. RP UNIV HOUSTON, DEPT CHEM, UNIV PK, HOUSTON, TX 77204 USA. NR 31 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 EI 1873-4448 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD SEP 22 PY 1995 VL 243 IS 5-6 BP 367 EP 377 DI 10.1016/0009-2614(95)00900-O PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RV435 UT WOS:A1995RV43500003 ER PT J AU LAMONT, CLA PERSSON, BNJ WILLIAMS, GP AF LAMONT, CLA PERSSON, BNJ WILLIAMS, GP TI DYNAMICS OF ATOMIC ADSORBATES - HYDROGEN ON CU(111) SO CHEMICAL PHYSICS LETTERS LA English DT Article ID INFRARED-SPECTROSCOPY; SURFACE RESISTIVITY; VIBRATION; DELOCALIZATION; CHEMISORPTION; ADSORPTION; MOLECULES; MECHANISM; DIFFUSION; PT(111) AB We have measured the absolute changes induced in the far infrared reflectivity by H and D atoms adsorbed on Cu(lll). The strongest features in the spectra are the dipole forbidden parallel vibrational modes which give rise to anti-absorption peaks with an intensity almost 10 times higher than that of the dipole allowed perpendicular modes. The dynamics can be explained by excitation of electron-hole pairs in the substrate. The energy relaxation time of the parallel vibration is 1 ps, but the linewidth is larger by a factor of 10 probably due to lateral tunneling of the adsorbates and dephasing processes. C1 FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST FESTKORPERFORSCH, D-52425 JULICH, GERMANY. BROOKHAVEN NATL LAB, NATL SYNCHROTRON LIGHT SOURCE DEPT, UPTON, NY 11973 USA. RP LAMONT, CLA (reprint author), UNIV HUDDERSFIELD, DEPT CHEM, HUDDERSFIELD HD1 3DH, W YORKSHIRE, ENGLAND. RI Persson, Bo Nils Johan/I-1548-2013 OI Persson, Bo Nils Johan/0000-0003-1535-738X NR 37 TC 38 Z9 38 U1 2 U2 16 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD SEP 22 PY 1995 VL 243 IS 5-6 BP 429 EP 434 DI 10.1016/0009-2614(95)00814-K PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RV435 UT WOS:A1995RV43500010 ER PT J AU WANG, X RANDALL, CR PENG, G CRAMER, SP AF WANG, X RANDALL, CR PENG, G CRAMER, SP TI SPIN-POLARIZED AND SITE-SELECTIVE X-RAY-ABSORPTION - DEMONSTRATION WITH FE PORPHYRINS AND K-BETA DETECTION SO CHEMICAL PHYSICS LETTERS LA English DT Article AB High-spin and low-spin Fe(III) porphyrins were studied by high resolution X-ray fluorescence and fluorescence-detected X-ray absorption spectroscopy using synchrotron radiation. The high-spin K beta spectrum is split into a main peak (K beta(1,3)) and a satellite (K beta') at 15 eV lower energy. The low-spin K beta(1,3) peak shifted approximate to 0.7 eV to lower energy, and the K beta' feature is almost unobservable. Ligand field multiplet calculations show that spin-up ((5)A(1)) and spin-down ((7)A(1)) states are separated for the high-spin spectrum. Spin polarization of the K beta-detected absorption was demonstrated by enhancement or elimination of the Is --> 3d transition, depending on the K beta region used for detection. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720. RP WANG, X (reprint author), UNIV CALIF DAVIS,DEPT APPL SCI,DAVIS,CA 95616, USA. NR 23 TC 26 Z9 26 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD SEP 22 PY 1995 VL 243 IS 5-6 BP 469 EP 473 DI 10.1016/0009-2614(95)00827-Q PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RV435 UT WOS:A1995RV43500017 ER PT J AU BURGHAUS, O KLEIN, MP AF BURGHAUS, O KLEIN, MP TI COHERENT RAMAN BEAT AND ESEEM EPR SPECTROSCOPY APPLIED TO A TRANSITION-METAL COMPLEX - COMPARISONS OF SENSITIVITY AND SPECTRAL RESOLUTION SO CHEMICAL PHYSICS LETTERS LA English DT Article ID ELECTRON-SPIN-ECHO; OXYGEN-EVOLVING COMPLEX; PHOTOSYNTHETIC APPARATUS; ENVELOPE MODULATION; PHOTOSYSTEM-II; MANGANESE; STATE AB Coherent Raman beats (CRB) resulting from N-14 hyperfine interactions have been observed in the EPR spectrum of the S = 1/2 state of a mixed valence di-mu-oxo bridged Mn(III, IV) bipyridyl dimer at X-band (9 GHz) and the results compared with those obtained from three-pulse electron spin echo envelope modulation (ESEEM) data recorded under similar conditions. The spectral resolution of the CRB data were approximate to 2-fold superior to the ESEEM while the signal-to-noise ratio was enhanced by a factor of approximate to 40. The resolution improvement derives from the fact that the CRBs can persist for times approaching the electron T-1 while the decay of the ESE envelope is limited by spectral diffusion. CRB detection benefits from a multiplex advantage relative to ESEEM. RP BURGHAUS, O (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720, USA. NR 18 TC 6 Z9 6 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD SEP 22 PY 1995 VL 243 IS 5-6 BP 480 EP 485 DI 10.1016/0009-2614(95)00800-J PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RV435 UT WOS:A1995RV43500019 ER PT J AU BURGHAUS, O KLEIN, MP AF BURGHAUS, O KLEIN, MP TI COHERENT RAMAN BEAT EPR WITHOUT PREEXCITATION PULSES SO CHEMICAL PHYSICS LETTERS LA English DT Article ID ELECTRON-SPIN-ECHO; NUTATION AB Coherent Raman beat electron paramagnetic resonance (EPR) spectra without application of one or more excitation pulses have been observed in the EPR spectrum of the tetramethyl-1,4-benzosemiquinone anion radical in a frozen mixture (50:50) of protonated and fully deuterated isopropyl alcohol at 4.2 K. The free nuclear transition frequencies of hydrogen and deuterium and the small quadrupole coupling of 146 kHz of the deuterium could be measured with high sensitivity and precision (line width = approximate to 40 kHz). The modulation amplitudes of the deuterium matrix lines at 2.2 MHz, as a function of the observer power, reveal a distinct resonance behavior coinciding with the frequency of the transient nutations, that is, when the Rabi frequency is approximately equal to the nuclear precession frequency. These observations suggest that the mechanism of coherence transfer between the electron and nuclear spin systems is related to the Hartmann-Hahn effect. RP BURGHAUS, O (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720, USA. NR 22 TC 9 Z9 9 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD SEP 22 PY 1995 VL 243 IS 5-6 BP 486 EP 492 DI 10.1016/0009-2614(95)00799-A PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RV435 UT WOS:A1995RV43500020 ER PT J AU CHEN, YH RIBY, J SRIVASTAVA, P BARTHOLOMEW, J DENISON, M BJELDANES, L AF CHEN, YH RIBY, J SRIVASTAVA, P BARTHOLOMEW, J DENISON, M BJELDANES, L TI REGULATION OF CYP1A1 BY INDOLO[3,2-B]CARBAZOLE IN MURINE HEPATOMA-CELLS SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID AH-RECEPTOR; RAT-LIVER; BINDING-SITES; HALF-LIFE; WILD-TYPE; INDUCTION; 2,3,7,8-TETRACHLORODIBENZO-P-DIOXIN; EXPRESSION; GENE; INDOLE-3-CARBINOL AB To determine the basis for unexpected differences in CYP1A1 inducing potencies and efficacies for the diet-derived indole derivative, indolo[3,2-b]carbazole (ICZ) and 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), we conducted a systematic analysis of events involved in the induced expression of CYP1A1 in murine hepatoma-derived cell lines (Hepa-1), In contrast to the effects of TCDD, induction kinetics and CYP1A1 mRNA half-life were dependent on ICZ concentration, and the response from low doses of inducer was transient due to rapid clearance of ICZ, TCDD and ICZ produced the same maximum response (i.e. equal efficacies) from a TCDD-responsive CAT reporter construct in Hepa-1 cells, When measured by the immediate responses associated with CYP1A1 expression, including cellular uptake of inducer, receptor transformation and binding to DRE (gel mobility shift assay), initiation of transcription (nuclear run-on assay), and short-term accumulation of mRNA (Northern blot assay), ICZ also exhibited an efficacy equal to that of TCDD and a potency that corresponds to its receptor affinity, ICZ is a potent and selective noncompetitive inhibitor of ethoxyresorufin O-deethylase activity (K-i = 1.5 nM). Taken together these results indicate that ICZ is a bifunctional modulator of CYP1A1 expression with intrinsic efficacy equal to that of TCDD. C1 UNIV CALIF BERKELEY,DEPT NUTR SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. LAWRENCE LIVERMORE NATL LAB,DEPT ENVIRONM TOXICOL,DAVIS,CA 95616. FU NCI NIH HHS [CA49250] NR 49 TC 75 Z9 75 U1 0 U2 6 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD SEP 22 PY 1995 VL 270 IS 38 BP 22548 EP 22555 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA RW314 UT WOS:A1995RW31400076 PM 7673247 ER PT J AU MULLER, J BURGDORFER, J NOID, DW AF MULLER, J BURGDORFER, J NOID, DW TI NOVEL ADIABATIC INVARIANT FOR THE 3-BODY COULOMB PROBLEM SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID EXCITED HELIUM; STATES; QUANTIZATION; MOLECULES; ENERGY; H-2+ AB The two-(fixed) center Coulomb problem possesses in nonrelativistic mechanics, besides the ''classical'' constants of motion, an additional constant of motion associated with dynamical symmetry and separability of the problem. When the motion of the nuclei is taken into account the constant of motion is destroyed but reappears as an adiabatic invariant. We have identified this novel adiabatic invariant for the unrestricted three-body problem in the limit of two heavy particles and one light particle. Unlike all other known adiabatic invariants, it is globally conserved to order delta = m/M in the light- to heavy-mass ratio. The significance of this invariant for the semiclassical description of the chemical bond and for diatomic molecules beyond the Born-Oppenheimer approximation is discussed. (C) 1995 American Institute of Physics. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP MULLER, J (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 32 TC 10 Z9 10 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 22 PY 1995 VL 103 IS 12 BP 4985 EP 4989 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RU876 UT WOS:A1995RU87600020 ER PT J AU DONLEY, JP RAJASEKARAN, JJ MCCOY, JD CURRO, JG AF DONLEY, JP RAJASEKARAN, JJ MCCOY, JD CURRO, JG TI MICROSCOPIC APPROACH TO INHOMOGENEOUS POLYMERIC LIQUIDS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID DENSITY-FUNCTIONAL THEORY; INTEGRAL-EQUATION THEORY; POLYATOMIC FLUIDS; SLITLIKE PORES; RISM THEORY; MELTS; BLENDS; INTERFACES; MOLECULES; ALLOYS AB We discuss a liquid-state theory for the equilibrium structure of inhomogeneous polymeric liquids. The theory consists of an equation for the;density profile of a liquid in an external potential, which has been derived previously by density functional methods. In general, this equation must be solved by sim;lation techniques. However, if the chains are modeled as random walks-which is a reasonable approximation for flexible polymers,at mel densities-we show that the theory reduces to a set of coupled integral equations which can be solved;numerically. We present results for a single component liquid near a hard wall. Last, we show that, in the Gaussian thread limit, the theory reduces to a form that is very similar to Edwards-Helfand-Tagami ''self-consistent field'' theory. However, there are important differences between the two theories for multicomponent liquids (a blend for example) if the types of polymers are structurally dissimilar. (C) 1995 American Institute of Physics. C1 UNIV NEW MEXICO,ADV MAT LAB,ALBUQUERQUE,NM 87106. NEW MEXICO INST MIN & TECHNOL,DEPT MAT & MET ENGN,SOCORRO,NM 87801. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RI McCoy, John/B-3846-2010 OI McCoy, John/0000-0001-5404-1404 NR 56 TC 37 Z9 37 U1 1 U2 11 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 22 PY 1995 VL 103 IS 12 BP 5061 EP 5069 DI 10.1063/1.470592 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RU876 UT WOS:A1995RU87600027 ER PT J AU ECKE, RE HU, YC MAINIERI, R AHLERS, G AF ECKE, RE HU, YC MAINIERI, R AHLERS, G TI EXCITATION OF SPIRALS AND CHIRAL-SYMMETRY BREAKING IN RAYLEIGH-BENARD CONVECTION SO SCIENCE LA English DT Article ID DEFECT CHAOS; TURBULENCE AB Spiral-defect populations in low-Prandtl number Rayleigh-Benard convection with slow rotation about a vertical axis were measured in carbon dioxide at high pressure. The results indicate that spirals act like ''thermally excited'' defects and that the winding direction of a spiral is analogous to a magnetic spin. Rotation about a vertical axis, the spiral analog of the magnetic field, breaks the zero-rotation chiral symmetry between clockwise and counterclockwise spiral defects. Many properties of spiral-defect statistics are well described by an effective statistical-mechanical model. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. UNIV CALIF SANTA BARBARA,CTR NONLINEAR SCI,SANTA BARBARA,CA 93106. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP ECKE, RE (reprint author), LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545, USA. OI Ecke, Robert/0000-0001-7772-5876 NR 14 TC 53 Z9 54 U1 0 U2 6 PU AMER ASSOC ADVAN SCIENCE PI WASHINGTON PA 1333 H ST NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD SEP 22 PY 1995 VL 269 IS 5231 BP 1704 EP 1707 DI 10.1126/science.269.5231.1704 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA RV948 UT WOS:A1995RV94800032 PM 17821641 ER PT J AU HUMMER, G PRATT, LR GARCIA, AE AF HUMMER, G PRATT, LR GARCIA, AE TI HYDRATION FREE-ENERGY OF WATER SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID COMPUTER-SIMULATION; SYSTEMS AB We study the chemical potential of water as a function of charge based on perturbation theory. By calculating the electrostatic-energy fluctuations of two states (fully charged and uncharged), we are able to determine accurate values for the dependence of the chemical potential on charge. We find identical results for the chemical-potential difference of fully charged and uncharged water from overlapping-histogram and acceptance-ratio methods and by smoothly connecting the curves of direct exponential averages. Our results agree with those of Rick and Berne (J. Am. Chem. Sec. 1994, 116, 3949) with respect to both the chemical-potential difference and its dependence on the charge coupling parameter. We observe significant deviations from simple Gaussian-fluctuation statistics. The dependence on the coupling parameter is not quadratic, as would be inferred from linear continuum models of electrostatics. C1 LOS ALAMOS NATL LAB, THEORET CHEM & MOLEC PHYS GRP T12, LOS ALAMOS, NM 87545 USA. RP HUMMER, G (reprint author), LOS ALAMOS NATL LAB, CTR NONLINEAR STUDIES, THEORET BIOL & BIOPHYS GRP T10, MS K710, LOS ALAMOS, NM 87545 USA. RI Pratt, Lawrence/H-7955-2012; Hummer, Gerhard/A-2546-2013 OI Pratt, Lawrence/0000-0003-2351-7451; Hummer, Gerhard/0000-0001-7768-746X NR 30 TC 61 Z9 61 U1 1 U2 11 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD SEP 21 PY 1995 VL 99 IS 38 BP 14188 EP 14194 DI 10.1021/j100038a062 PG 7 WC Chemistry, Physical SC Chemistry GA RW499 UT WOS:A1995RW49900062 ER PT J AU MEZYK, SP BARTELS, DM AF MEZYK, SP BARTELS, DM TI DIRECT EPR MEASUREMENT OF ARRHENIUS PARAMETERS FOR THE REACTIONS OF H' ATOMS WITH H2O2 AND D' ATOMS WITH D2O2 IN AQUEOUS-SOLUTION SO JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS LA English DT Article ID ELEVATED-TEMPERATURES; PULSE-RADIOLYSIS; HYDROXYL RADICALS; HYDRATED ELECTRONS; ACTIVATION-ENERGY; WATER RADIOLYSIS; HYDROGEN-ATOMS; RATE CONSTANTS; KINETIC DATA; DEPENDENCE AB Rate constants for the reaction of hydrogen atoms with hydrogen peroxide in aqueous solution have been determined by use of pulse radiolysis and electron paramagnetic resonance (EPR) free-induction decay attenuation measurements. At 22.7 degrees C a value of (3.48 +/- 0.10) x 10(7) dm(3) mol(-1) s(-1) was measured, and over the temperature range 7.6-84.6 degrees C, an activation energy of 21.12 +/- 0.56 kJ mol(-1) was determined. By performing these measurements in basic solution, the rate constant at 22.3 degrees C for hydrogen atom reaction with the hydroperoxy anion, HO2-, has been calculated as (1.24 +/- 0.14) x 10(9) dm(3) mol(-1) s(-1), with a corresponding activation energy of 17.32 +/- 0.61 kJ mol(-1) over the temperature range 7.3-41.8 degrees C. Measurements were also performed for deuterium atoms, where for D2O2 and DO2- reaction at 25 degrees C, values of (2.30 +/- 0.10) x 10(7) and 2.12 x 10(9) dm(3) mol(-1) s(-1) were measured, respectively. Only the D2O2 activation energy of 25.58 +/- 1.68 kJ mol(-1) was accurately determined, but an estimate for DO2- was also higher than for the corresponding hydrogen atom reaction. From the results of measurements performed in a mixed H2O-D2O solvent, and using semiclassical transition-state theory arguments, it is shown that the reaction barrier is dominated by the hydrogen atom vibrational adiabatic zero-point energy change. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP MEZYK, SP (reprint author), ATOM ENERGY CANADA LTD,WHITESHELL LABS,PINAWA,MB R0E 1L0,CANADA. NR 46 TC 25 Z9 25 U1 0 U2 8 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0956-5000 J9 J CHEM SOC FARADAY T JI J. Chem. Soc.-Faraday Trans. PD SEP 21 PY 1995 VL 91 IS 18 BP 3127 EP 3132 DI 10.1039/ft9959103127 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RW341 UT WOS:A1995RW34100024 ER PT J AU GLATZMAIER, GA ROBERTS, PH AF GLATZMAIER, GA ROBERTS, PH TI A 3-DIMENSIONAL SELF-CONSISTENT COMPUTER-SIMULATION OF A GEOMAGNETIC-FIELD REVERSAL SO NATURE LA English DT Article ID STELLAR CONVECTIVE DYNAMOS; ROTATING SPHERICAL-SHELL; EARTHS MAGNETIC-FIELD; NUMERICAL SIMULATIONS; CORE; DRIVEN; PATHS; GEOMETRY; RECORD; MODEL AB A three-dimensional, self-consistent numerical model of the geodynamo is described, that maintains a magnetic field for over 40,000 years. The model, which Incorporates a finitely conducting inner core, undergoes several polarity excursions and then, near the end of the simulation, a successful reversal of the dipole moment. This simulated magnetic field reversal shares some features with real reversals of the geomagnetic field, and may provide insight into the geomagnetic reversal mechanism. C1 UNIV CALIF LOS ANGELES, INST GEOPHYS & PLANETARY PHYS, LOS ANGELES, CA 90024 USA. RP LOS ALAMOS NATL LAB, INST GEOPHYS & PLANETARY PHYS, POB 1663, LOS ALAMOS, NM 87454 USA. NR 51 TC 511 Z9 526 U1 8 U2 67 PU NATURE PUBLISHING GROUP PI LONDON PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 EI 1476-4687 J9 NATURE JI Nature PD SEP 21 PY 1995 VL 377 IS 6546 BP 203 EP 209 DI 10.1038/377203a0 PG 7 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA RV872 UT WOS:A1995RV87200030 ER PT J AU GRAVES, WS BHARADWAJ, V MCGINNIS, D AF GRAVES, WS BHARADWAJ, V MCGINNIS, D TI A NONDESTRUCTIVE FAST BEAM PROFILE MONITOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB A nondestructive beam profile monitor has been built and installed in the Fermilab booster synchrotron. The detector collects and amplifies the signal from the residual vacuum gas ions created by the passage of the beam. The new feature of this detector is the fast electronics used to amplify and record the signal. It is now possible to observe fast transverse beam dynamics on a timescale of one orbit. The design and performance of the profile monitor are described. C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL. NR 7 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD SEP 21 PY 1995 VL 364 IS 1 BP 13 EP 18 DI 10.1016/0168-9002(95)00218-9 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA RV390 UT WOS:A1995RV39000003 ER PT J AU GRAVES, WS AF GRAVES, WS TI ERROR ANALYSIS AND CORRECTION IN A BEAM PROFILE MONITOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB An analysis of the accuracy and sources of error of transverse beam profile measurements made with an ion profile monitor in the Fermilab booster is presented. Two dimensional computer simulations are compared with experiment to determine the magnitude of the errors and a correction algorithm that uses beam size and charge as parameters is developed. C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL. NR 2 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD SEP 21 PY 1995 VL 364 IS 1 BP 19 EP 26 DI 10.1016/0168-9002(95)00219-7 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA RV390 UT WOS:A1995RV39000004 ER PT J AU POELKER, M COULTER, KP HOLT, RJ JONES, CE KOWALCZYK, RS YOUNG, L ZEIDMAN, B TOPORKOV, DK AF POELKER, M COULTER, KP HOLT, RJ JONES, CE KOWALCZYK, RS YOUNG, L ZEIDMAN, B TOPORKOV, DK TI LASER-DRIVEN SOURCE OF SPIN-POLARIZED ATOMIC-HYDROGEN AND DEUTERIUM SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID ALKALI-METAL VAPOR; EXCHANGE COLLISIONS; ELASTIC-SCATTERING; ANALYZING POWER; STORAGE RING; TARGETS; CONSEQUENCES; FIELD AB A laser-driven source of spin-polarized hydrogen (H) and deuterium (D) that relies on the technique of optical pumping spin exchange has been constructed. In this source, H or D atoms and potassium atoms flow continuously through a drifilm-coated spin-exchange cell where potassium atoms are optically pumped with circularly-polarized laser light in a high magnetic field. The H or D atoms become polarized through spin-exchange collisions with polarized potassium atoms. High electron polarization(approximate to 80%) has been measured for H and D atoms at flow rates approximate to 2 x 10(17) atoms/s. Lower polarization values are measured for flow rates exceeding 1 X 10(18) atoms/s. In this paper, we describe the performance of the laser-driven source as a function of H and D atomic flow rate, magnetic field strength, alkali density and pump-laser power. Polarization measurements as a function of flow rate and magnetic field suggest that, despite a high magnetic field, atoms within the optical-pumping spin-exchange apparatus evolve to spin-temperature equilibrium which results in direct polarization of the H and D nuclei. C1 ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. BUDKER INST NUCL PHYS,NOVOSIBIRSK 630090,RUSSIA. RI Holt, Roy/E-5803-2011 NR 41 TC 15 Z9 16 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD SEP 21 PY 1995 VL 364 IS 1 BP 58 EP 69 DI 10.1016/0168-9002(95)00281-2 PG 12 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA RV390 UT WOS:A1995RV39000008 ER PT J AU LI, CJ LI, Z AF LI, CJ LI, Z TI DEVELOPMENT OF CURRENT-BASED MICROSCOPIC DEFECT ANALYSIS-METHODS AND ASSOCIATED OPTICAL FILLING TECHNIQUES FOR THE INVESTIGATION ON HIGHLY IRRADIATED HIGH-RESISTIVITY SILICON DETECTORS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID LEVEL TRANSIENT SPECTROSCOPY; NEUTRON; RADIATION; TRAPS AB Current based microscopic defect analysis methods such as current deep level transient spectroscopy (I-DLTS) and thermally stimulated current (TSC) have been further developed in accordance with the need for the defect analysis of highly irradiated (Phi(n) > 10(13) n/cm(2)) high resistivity silicon detectors. The new I-DLTS/TSC system has a temperature range of 8 K less than or equal to T less than or equal to 450 K and a high sensitivity that can detect a defect concentration of less than 10(10)/cm(3) (background noise as low as 10 fA). A new filling method using different wavelength laser illumination has been applied, which is more efficient and suitable than the traditional voltage pulse filling. It has been found that the filling of a defect level depends on such factors as the total concentration of free carriers generated or injected, the penetration length of the laser (laser wavelength), the temperature at which the filling is taking place, as well as the decay time after the filling (but before the measurement). The mechanism of the defect filling can be explained by the competition between trapping and detrapping of defect levels, possible capture cross section temperature dependence, and interaction among various defect levels in terms of charge transferring. Optimum defect filling conditions have been suggested for highly irradiated high resistivity silicon detectors. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. CHINESE ACAD SCI,INST SEMICOND,BEIJING 100083,PEOPLES R CHINA. NR 28 TC 13 Z9 13 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD SEP 21 PY 1995 VL 364 IS 1 BP 108 EP 117 DI 10.1016/0168-9002(95)00437-8 PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA RV390 UT WOS:A1995RV39000015 ER PT J AU BAGDASAROV, SL COX, PT DEMORTIER, L GIOKARIS, ND KHAZINS, DM ANDERSON, DF ZIMMERMAN, J BUDAGOV, JA ROMANOV, VM MORGAN, M AF BAGDASAROV, SL COX, PT DEMORTIER, L GIOKARIS, ND KHAZINS, DM ANDERSON, DF ZIMMERMAN, J BUDAGOV, JA ROMANOV, VM MORGAN, M TI DESIGN AND BEAM TEST OF AN ELECTROMAGNETIC CALORIMETER CONSTRUCTED FROM HIGH-PRESSURE GAS-IONIZATION WIGGLER TUBES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID ARGON AB An electromagnetic (EM) calorimeter constructed from high-pressure gas-ionization tubes with sinusoid-like longitudinal profile (wiggler tubes) has been assembled, and tested in an electron beam at the CERN SPS. This design greatly improves the EM energy resolution compared to a calorimeter constructed from straight tubes and eliminates the resolution dependence on the beam angle. An EM energy resolution of delta E/E = (32.0 +/- 1.6)%/root E + (2.9 +/- 0.3)% has been achieved. Further improvements of the EM energy resolution are discussed. The calorimeter is very radiation hard, has a fast response, and it is stable and mechanically robust; it is intended for the forward region of the LHC collider detectors. C1 ROCKEFELLER UNIV,DEPT EXPTL PHYS,NEW YORK,NY 10021. FERMILAB NATL ACCELERATOR LAB,PARTICLE DETECTOR GRP,BATAVIA,IL 60510. JOINT INST NUCL RES,MOSCOW 101000,RUSSIA. ABIL ENGN TECHNOL INC,S HOLLAND,IL 60473. NR 4 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD SEP 21 PY 1995 VL 364 IS 1 BP 139 EP 143 DI 10.1016/0168-9002(95)00340-1 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA RV390 UT WOS:A1995RV39000019 ER PT J AU BYRUM, K DAWSON, J NODULMAN, L WICKLUND, AB AMIDEI, D BURKETT, K GERDES, D MIAO, C WOLINSKI, D FRISCH, H FRIDMANN, Y SANDERS, H DRAKE, G AF BYRUM, K DAWSON, J NODULMAN, L WICKLUND, AB AMIDEI, D BURKETT, K GERDES, D MIAO, C WOLINSKI, D FRISCH, H FRIDMANN, Y SANDERS, H DRAKE, G TI SHOWER MAXIMUM TRIGGER FOR ELECTRONS AND PHOTONS AT CDF SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID CENTRAL TRACKING CHAMBER AB For the 1994 Tevatron collider run, CDF has upgraded the electron and photon trigger hardware to make use of shower maximum information from the central shower maximum detector. For electrons, the upgrade has resulted in a 50% reduction in backgrounds while retaining approximately 90% of the signal. The new trigger also eliminates the background to photon triggers from single-phototube discharge. C1 UNIV MICHIGAN,ANN ARBOR,MI 48109. UNIV CHICAGO,CHICAGO,IL 60637. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP BYRUM, K (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 7 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD SEP 21 PY 1995 VL 364 IS 1 BP 144 EP 149 DI 10.1016/0168-9002(95)00398-3 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA RV390 UT WOS:A1995RV39000020 ER PT J AU KHOA, DT SATCHLER, GR AF KHOA, DT SATCHLER, GR TI REALISTIC SCENARIO FOR THE QUASI-ELASTIC SCATTERING OF LI-11,C-11+C-12 AT E/A-SIMILAR-OR-EQUAL-TO-60 MEV SO PHYSICS LETTERS B LA English DT Article DE QUASI-ELASTIC LI-11, C-11 SCATTERING; TOTAL REACTION CROSS SECTION ID COUPLED-CHANNELS CALCULATIONS; QUASI-ELASTIC SCATTERING; REACTION CROSS-SECTIONS; FOLDING MODEL; INTERMEDIATE ENERGIES; INELASTIC-SCATTERING; LIGHT-NUCLEI; LI-11; C-12; TARGET AB The elastic Li-11, C-11+C-12 scattering at E/A similar or equal to 60 MeV has been studied using a semimicroscopic version of the optical model. The real optical potential was calculated within the double-folding model using a realistic nucleon-nucleon effective interaction and a more accurate treatment of the knock-on exchange. A Hartree-Fock density was taken for Li-11, while the shell model was used for C-11,C-12. The imaginary potential was taken in standard Woods-Saxon form, The dynamic polarization potential due to the breakup effect, based on the results of realistic four-body calculations of the Li-11+C-12 scattering, has been added to both the real and imaginary potentials for Li-11. From different assumptions about the absorptive strength at the surface region, we found a set of parameters which give a reasonable description of the quasielastic Li-11,C-11+C-12 scattering data at E/A similar or equal to 60 MeV as well as reproducing the observed trend for the total reaction cross section at higher energies. C1 FREE UNIV BERLIN,FACHBEREICH PHYS,D-14195 BERLIN,GERMANY. OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996. RP KHOA, DT (reprint author), HAHN MEITNER INST BERLIN GMBH,BEREICH FK,GLEINICKER STR 100,D-14109 BERLIN,GERMANY. RI Khoa, Dao/B-9640-2009 NR 31 TC 22 Z9 23 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD SEP 21 PY 1995 VL 358 IS 1-2 BP 14 EP 20 DI 10.1016/0370-2693(95)00999-2 PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA RV965 UT WOS:A1995RV96500003 ER PT J AU DOKTYCZ, MJ HURST, GB HABIBIGOUDARZI, S MCLUCKEY, SA TANG, K CHEN, CH UZIEL, M JACOBSON, KB WOYCHIK, RP BUCHANAN, MV AF DOKTYCZ, MJ HURST, GB HABIBIGOUDARZI, S MCLUCKEY, SA TANG, K CHEN, CH UZIEL, M JACOBSON, KB WOYCHIK, RP BUCHANAN, MV TI ANALYSIS OF POLYMERASE CHAIN REACTION-AMPLIFIED DNA PRODUCTS BY MASS-SPECTROMETRY USING MATRIX-ASSISTED LASER-DESORPTION AND ELECTROSPRAY - CURRENT STATUS SO ANALYTICAL BIOCHEMISTRY LA English DT Article ID QUADRUPOLE ION-TRAP; CYSTIC-FIBROSIS GENE; OLIGONUCLEOTIDE DUPLEX; HIGH-RESOLUTION; NUCLEIC-ACIDS; IONIZATION; ULTRAVIOLET; PRINCIPLES; OLIGODEOXYRIBONUCLEOTIDES; IDENTIFICATION AB Recent advances in molecular biology are making it possible to diagnose genetic diseases and identify pathogens through the analysis of DNA. As clinical applications for molecular diagnosis increase, rapid, reliable methods for determination of DNA size will be needed. Mass spectrometry offers the potential of analyzing amplified DNA quickly and reliably, without the need for gel-based separation and sample labeling steps that are conventionally employed. Both electrospray ionization and matrix-assisted laser desorption/ionization have been evaluated for the size analysis of DNA using both synthetic oligonucleotides and PCR-amplified samples corresponding to bases 1626 to 1701 of the cystic fibrosis transmembrane conductance regulator gene. Both technologies have been demonstrated to have mass range and sensitivity required for the analysis of PCR-amplified DNA in this size range using minimal sample preparation. Steps required to incorporate either ionization technique into a reliable analytical scheme for the rapid, routine analysis of DNA are outlined. (C) 1995 Academic Press, Inc. C1 OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV HLTH SERV RES,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. VANDERBILT UNIV,NASHVILLE,TN 37240. RI McLuckey, Scott/B-2203-2009; Doktycz, Mitchel/A-7499-2011; Tang, Kai/A-2194-2011; Buchanan, Michelle/J-1562-2016 OI McLuckey, Scott/0000-0002-1648-5570; Doktycz, Mitchel/0000-0003-4856-8343; Buchanan, Michelle/0000-0002-8078-4575 NR 61 TC 60 Z9 63 U1 0 U2 3 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0003-2697 J9 ANAL BIOCHEM JI Anal. Biochem. PD SEP 20 PY 1995 VL 230 IS 2 BP 205 EP 214 DI 10.1006/abio.1995.1465 PG 10 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA RW605 UT WOS:A1995RW60500002 PM 7503409 ER PT J AU ALLEN, MG MCMANUS, KR SONNENFROH, DM PAUL, PH AF ALLEN, MG MCMANUS, KR SONNENFROH, DM PAUL, PH TI PLANAR LASER-INDUCED-FLUORESCENCE IMAGING MEASUREMENTS OF OH AND HYDROCARBON FUEL FRAGMENTS IN HIGH-PRESSURE SPRAY-FLAME COMBUSTION SO APPLIED OPTICS LA English DT Article DE FLUORESCENCE; COMBUSTION DIAGNOSTICS; HIGH-PRESSURE COMBUSTION; OH; POLYCYCLIC AROMATIC HYDROCARBON; SPRAY FLAME ID TUNABLE EXCIMER LASERS; INTERNAL-COMBUSTION; DIFFUSION FLAME; BAND; SOOT AB Planar laser-induced fluorescence images of OH have been obtained in liquid-fueled spray flames burning heptane, ethanol, and methanol over a range of pressures from 0.1 to 1.0 MPa. In addition to the OH fluorescence, a nonresonant fluorescence interference that increased rapidly with pressure was detected. Examination of the spectrum of this interference indicates that it arises from hydrocarbon fuel-fragment species in the fuel-rich zones of the flame. The pressure dependence of the fluorescence signal is examined in both steady-state and time-dependent analyses, and a model for evaluation of pressure effects and quenching variations in quantitative imaging measurements in nonpremixed flame environments is presented. The results indicate that increased combustor pressure results in a rapid rise of the volume fraction of hydrocarbon fragments and a decrease in the OH volume fraction. C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551. RP ALLEN, MG (reprint author), PHYS SCI INC,20 NEW ENGLAND BUSINESS CTR,ANDOVER,MA 01810, USA. NR 40 TC 31 Z9 31 U1 0 U2 6 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD SEP 20 PY 1995 VL 34 IS 27 BP 6287 EP 6300 PG 14 WC Optics SC Optics GA RV160 UT WOS:A1995RV16000031 PM 21060473 ER PT J AU COPI, CJ OLIVE, KA SCHRAMM, DN AF COPI, CJ OLIVE, KA SCHRAMM, DN TI LARGE-SCALE BARYON ISOCURVATURE INHOMOGENEITIES SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMOLOGY, THEORY; ELEMENTARY PARTICLES; NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES ID PRIMORDIAL NUCLEOSYNTHESIS; MODEL; UNIVERSE AB Big bang nucleosynthesis constraints on baryon isocurvature perturbations are determined. A simple model ignoring the effects of the scale of the perturbations is first reviewed. This model is then extended to address the claim that large amplitude perturbations will collapse, preventing their baryons from contributing to the observed baryon density. It is found that baryon isocurvature perturbations are constrained to provide only a slight increase in the density of baryons in the universe over the standard homogeneous model. In particular, it is found that models which rely on power laws and the random phase approximation for the power spectrum are incompatible with big bang nucleosynthesis unless an ad hoc, small-scale cutoff is included. C1 NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV MINNESOTA,SCH PHYS & ASTRON,MINNEAPOLIS,MN 55455. RP COPI, CJ (reprint author), UNIV CHICAGO,DEPT ASTRON & ASTROPHYS,5640 S ELLIS AVE,CHICAGO,IL 60637, USA. NR 29 TC 12 Z9 12 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 20 PY 1995 VL 451 IS 1 BP 51 EP 59 DI 10.1086/176199 PN 1 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RU168 UT WOS:A1995RU16800005 ER PT J AU REACH, WT DWEK, E FIXSEN, DJ HEWAGAMA, T MATHER, JC SHAFER, RA BANDAY, AJ BENNETT, CL CHENG, ES EPLEE, RE LEISAWITZ, D LUBIN, PM READ, SM ROSEN, LP SHUMAN, FGD SMOOT, GF SODROSKI, TJ WRIGHT, EL AF REACH, WT DWEK, E FIXSEN, DJ HEWAGAMA, T MATHER, JC SHAFER, RA BANDAY, AJ BENNETT, CL CHENG, ES EPLEE, RE LEISAWITZ, D LUBIN, PM READ, SM ROSEN, LP SHUMAN, FGD SMOOT, GF SODROSKI, TJ WRIGHT, EL TI FAR-INFRARED SPECTRAL OBSERVATIONS OF THE GALAXY BY COBE SO ASTROPHYSICAL JOURNAL LA English DT Article DE DIFFUSE RADIATION; DUST, EXTINCTION; INFRARED, ISM, CONTINUUM; RADIO CONTINUUM, ISM ID HIGH GALACTIC LATITUDES; COSMIC BACKGROUND-RADIATION; MOLECULAR CLOUDS; INTERSTELLAR GRAINS; OPTICAL-PROPERTIES; MILKY-WAY; DUST; EMISSION; ANISOTROPY; SCALE AB We derive Galactic continuum spectra from 5-96 cm(-1) from COBE/FIRAS observations. The spectra are dominated by warm dust emission, which may be fitted with a single temperature in the range 16-21 K (for nu(2) emissivity) along each line of sight. Dust heated by the attenuated radiation field in molecular clouds gives rise to intermediate-temperature (10-14 K) emission in the inner Galaxy only. A widespread, very cold component (4-7 K) with optical depth that is spatially correlated with the warm component is also detected. The cold component is unlikely to be due to very cold dust shielded from starlight because it is present at high latitude. We consider hypotheses that the cold component is due to enhanced submillimeter emissivity of the dust that gives rise to the warm component, or that it may be due to very small, large, or fractal particles. Lack of substantial power above the emission from warm dust places strong constraints on the amount of cold gas in the Galaxy. The microwave sky brightness due to interstellar dust is dominated by the cold component, and its angular variation could limit our ability to discern primordial fluctuations in the cosmic microwave background radiation. C1 APPL RES CORP,GREENBELT,MD 20771. HUGHES STX,GREENBELT,MD 20771. GEN SCI CORP,GREENBELT,MD 20771. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. UNIV CALIF LOS ANGELES,DEPT ASTRON,LOS ANGELES,CA 90024. RP REACH, WT (reprint author), NASA,GODDARD SPACE FLIGHT CTR,UNIV SPACE RES ASSOC,CODE 685,GREENBELT,MD 20771, USA. RI Reach, William/C-4710-2008; Hewagama, T/C-8488-2012; Dwek, Eli/C-3995-2012; OI Reach, William/0000-0001-8362-4094 NR 61 TC 214 Z9 214 U1 1 U2 3 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 20 PY 1995 VL 451 IS 1 BP 188 EP 199 DI 10.1086/176210 PN 1 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RU168 UT WOS:A1995RU16800016 ER PT J AU WHITE, RL BECKER, RH AF WHITE, RL BECKER, RH TI AN 8 YEAR STUDY OF THE RADIO-EMISSION FROM THE WOLF-RAYET BINARY HD-193793=WR-140 SO ASTROPHYSICAL JOURNAL LA English DT Article DE BINARIES, SPECTROSCOPIC; RADIO CONTINUUM, STARS; STARS, INDIVIDUAL (HD 193793); STARS, WOLF-RAYET ID EARLY-TYPE STARS; HD-193793 AB HD 193793 = WR 140 is a W-R + O binary system with a 7.9 yr, highly elliptical (e = 0.85) orbit. It shows variable, nonthermal radio emission over its orbital period that is explained as synchrotron radiation from relativistic electrons accelerated in the shock between the W-R and O winds. Although we now know of quite a few W-R + O star binary systems, only HD 193793 is well studied across the entire electromagnetic spectrum; hence, it affords us the best opportunity to test various models for the system against a wealth of observational data. HD 193793 is an ideal laboratory for studying the properties of hot star winds and the physics of particle acceleration by strong shocks in those winds. In this paper we present the results of 8 years of monitoring the radio flux density from HD 193793 with the VLA. This database is unique both in terms of its dense coverage of an entire binary cycle and because it extends the radio coverage to 2 cm wavelength, a shorter wavelength than previously available. With these data we are able to simultaneously solve for the time-dependent attenuation in the system and the intrinsic radio luminosity. The standard model of spherically symmetric colliding winds faces severe difficulties in explaining the observations. We conclude that the radio data are most readily interpreted if we adopt a new model of the system in which the W-R star wind is strongly equatorially enhanced, so that most of the mass loss is confined to a plane. This model for the W-R wind also provides a natural explanation for the sudden formation of dust that causes an infrared outburst just after periastron. C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA. RP WHITE, RL (reprint author), SPACE TELESCOPE SCI INST,3700 SAN MARTIN DR,BALTIMORE,MD 21218, USA. NR 12 TC 63 Z9 63 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 20 PY 1995 VL 451 IS 1 BP 352 EP 358 DI 10.1086/176224 PN 1 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RU168 UT WOS:A1995RU16800030 ER PT J AU RYUTOVA, MP HABBAL, SR AF RYUTOVA, MP HABBAL, SR TI THE EFFECTS OF MASS FLOWS ON THE DISSIPATION OF ALFVEN WAVES IN THE UPPER LAYERS OF THE SOLAR ATMOSPHERE SO ASTROPHYSICAL JOURNAL LA English DT Article DE MHD; PLASMAS; SUN, ATMOSPHERE; WAVES AB The influence of parallel plasma flows on the propagation of shear Alfven waves along magnetic structures is considered. It is shown that even in a simple case of regular mass flows directed along the magnetic field, their presence considerably modifies the dissipation of shear Alfven waves, affecting both the magnitude and the height of maximum dissipation. The strongest effect occurs in the case of downflows when the flow velocity at a certain height becomes equal to the Alfven velocity. Near that point, the wave comes to extinction and gives off its energy completely. The axial extent of the absorption region is evaluated. This effect can be directly associated with observed high-velocity downflows in the transition region, and, in particular, can serve as a qualitative explanation for the high variability of the emission observed near 10(5) K. In the presence of upward mass flows and moderate downflows, the dissipation of phase-mixed Alfven waves is accompanied by the radial redistribution of the energy input across the magnetic structure, thus creating a mosaic pattern in the emitting regions. The flow velocities are assumed to be below the thresholds which correspond to the onset of hydrodynamic and dissipative instabilities. C1 HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138. RP RYUTOVA, MP (reprint author), LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,L-413,LIVERMORE,CA 94550, USA. NR 22 TC 22 Z9 22 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 20 PY 1995 VL 451 IS 1 BP 381 EP 390 DI 10.1086/176227 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RU168 UT WOS:A1995RU16800033 ER PT J AU CHIANG, PW DZIDA, G GRUMET, J CHENG, JF SONG, WJ CROMBEZ, E VANKEUREN, ML KURNIT, DM AF CHIANG, PW DZIDA, G GRUMET, J CHENG, JF SONG, WJ CROMBEZ, E VANKEUREN, ML KURNIT, DM TI EXPRESSED SEQUENCE TAGS FROM THE LONG ARM OF HUMAN-CHROMOSOME-21 SO GENOMICS LA English DT Article ID HUMAN GENOME PROJECT; CDNAS; ASSIGNMENT; SELECTION AB We isolated expressed sequence tags (ESTs) on the long arm of chromosome 21. The ESTs were mapped by PCR using a monochromosomal somatic-cell mapping panel. Of a total of 55 cDNAs, 30 mapped back uniquely to chromosome 21, 7 mapped back to other chromosomes including chromosome 21, 8 mapped back to chromosomes other than 21, and 10 could not be assigned using this methodology. The 30 chromosome 21-specific markers so isolated represent useful EST markers. A rapid PCR-based method was used to delineate the expression pattern of these 30 pairs in different tissues. (C) 1995 Academic Press, Inc. C1 UNIV MICHIGAN,MED CTR,DEPT PEDIAT,ANN ARBOR,MI 48109. UNIV MICHIGAN,MED CTR,DEPT HUMAN GENET,ANN ARBOR,MI 48109. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR HUMAN GENOME,BERKELEY,CA 94720. RP CHIANG, PW (reprint author), UNIV MICHIGAN,MED CTR,HOWARD HUGHES MED INST,1150 W MED DR,MSRBI ROOM 3520,ANN ARBOR,MI 48109, USA. FU NHGRI NIH HHS [1 R01 HG00923]; NHLBI NIH HHS [1 R01 HL50025] NR 13 TC 9 Z9 9 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD SEP 20 PY 1995 VL 29 IS 2 BP 383 EP 389 PG 7 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA RY055 UT WOS:A1995RY05500009 PM 8666385 ER PT J AU DERRY, JMJ WIEDEMANN, P BLAIR, P WANG, Y KERNS, JA LEMAHIEU, V GODFREY, VL WILKINSON, JE FRANCKE, U AF DERRY, JMJ WIEDEMANN, P BLAIR, P WANG, Y KERNS, JA LEMAHIEU, V GODFREY, VL WILKINSON, JE FRANCKE, U TI THE MOUSE HOMOLOG OF THE WISKOTT-ALDRICH SYNDROME PROTEIN (WASP) GENE IS HIGHLY CONSERVED AND MAPS NEAR THE SCURFY (SF) MUTATION ON THE X-CHROMOSOME SO GENOMICS LA English DT Article ID LYMPHORETICULAR DISEASE; TRANSCRIPTION FACTOR; T-CELLS; ABNORMALITIES; LYMPHOCYTES; SEQUENCES; PLATELETS; BINDING; MUTANT; GRB2 AB The mouse WASP gene, the homolog of the gene mutated in Wiskott-Aldrich syndrome, has been isolated and sequenced. The predicted amino acid sequence is 86% identical to the human WASP sequence. A distinct feature of the mouse gene is an expanded polymorphic GGA trinucleotide repeat that codes for polyglycine and varies from 15 to 17 triplets in different Mus musculus strains. The genomic structure of the mouse gene closely resembles the human with respect to exon-intron positions and intron lengths. The mouse WASP gene is expressed as an similar to 2.4-kb mRNA in thymus and spleen. Chromosomal mapping in an interspecific M. musculus/M. spretus backcross placed the Wasp locus near the centromere of the mouse X chromosome, inseparable from Gatal, Tcfe3, and scurfy (sf). This localization makes Wasp a candidate for involvement in scurfy, a T cell-mediated fatal lymphoreticular disease of mice that has previously been proposed as a mouse homolog of Wiskott-Aldrich syndrome. Northern analysis of sf tissue samples indicated the presence of WASP mRNA in liver and skin, presumably as a consequence of lymphocytic infiltration, but no abnormalities in the amount or size of mRNA present. (C) 1995 Academic Press, Inc. C1 STANFORD UNIV,MED CTR,HOWARD HUGHES MED INST,STANFORD,CA 94305. STANFORD UNIV,MED CTR,DEPT GENET,STANFORD,CA 94305. STANFORD UNIV,MED CTR,DEPT PEDIAT,STANFORD,CA 94305. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. UNIV TENNESSEE,COLL VET MED,KNOXVILLE,TN 37901. NR 33 TC 38 Z9 39 U1 0 U2 5 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD SEP 20 PY 1995 VL 29 IS 2 BP 471 EP 477 PG 7 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA RY055 UT WOS:A1995RY05500021 PM 8666397 ER PT J AU JARVELA, IE MITCHISON, HM ORAWE, AM MUNROE, PB TASCHNER, PEM DEVOS, N LERNER, TJ DARIGO, KL CALLEN, DF THOMPSON, AD KNIGHT, M MARRONE, BL MUNDT, MO MEINCKE, L BREUNING, MH GARDINER, RM DOGGETT, NA MOLE, SE AF JARVELA, IE MITCHISON, HM ORAWE, AM MUNROE, PB TASCHNER, PEM DEVOS, N LERNER, TJ DARIGO, KL CALLEN, DF THOMPSON, AD KNIGHT, M MARRONE, BL MUNDT, MO MEINCKE, L BREUNING, MH GARDINER, RM DOGGETT, NA MOLE, SE TI YAC AND COSMID CONTIGS SPANNING THE BATTEN-DISEASE (CLN3) REGION AT 16P12.1-P11.2 SO GENOMICS LA English DT Article ID NEURONAL CEROID-LIPOFUSCINOSIS; REPETITIVE DNA-SEQUENCES; HUMAN CHROMOSOME-16; INSITU HYBRIDIZATION; PHYSICAL MAP; LOCUS CLN3; GENE; LOCALIZATION; IDENTIFICATION; FRAGMENTS AB A yeast artificial chromosome (YAC) contig has been constructed in 16p12.1-p11.2 that encompasses three loci (D16S288, D16S299, and D16S298) closely linked to the gene causing fatten disease or juvenile-onset neuronal ceroid lipofuscinosis (CLN3). The physical map has been ordered using 42 sequence tagged sites. Four genes, interleukin-4 receptor (IL4R), phenol-preferring phenol sulfotransferase (STP), monoamine-preferring phenol sulfotransferase (STM), and sialophorin (SPN), have been mapped to the YAC contig. A partial genomic restriction map has been constructed to confirm the order and distances between D16S288 and STM. This part of the YAC contig is represented in eight cosmid contigs. One of these contains D16S298, predicted to be the locus closest to CLN3. The overlapping genomic clones are a valuable resource for cloning the Batten gene (CLN3) and other genes in the region. (C) 1995 Academic Press, Inc. C1 UCL, SCH MED, RAYNE INST, DEPT PAEDIAT, LONDON WC1E 6JJ, ENGLAND. LEIDEN UNIV, DEPT HUMAN GENET, SYLVIUS LAB, 2300 RA LEIDEN, NETHERLANDS. MASSACHUSETTS GEN HOSP, MOLEC NEUROGENET UNIT, BOSTON, MA USA. WOMENS & CHILDRENS HOSP, DEPT CYTOGENET & MOLEC GENET, ADELAIDE, SA, AUSTRALIA. LOS ALAMOS NATL LAB, DIV LIFE SCI, LOS ALAMOS, NM USA. LOS ALAMOS NATL LAB, CTR HUMAN GENOME STUDIES, LOS ALAMOS, NM 87545 USA. RI Mitchison, Hannah/C-1891-2008; Mole, Sara/C-2024-2008; Callen, David/G-1975-2012; Jarvela, Irma/L-5836-2013; OI Callen, David/0000-0002-6189-9991; Mole, Sara/0000-0003-4385-4957; Taschner, Peter/0000-0001-9621-465X FU PHS HHS [28722, 30152, 32009]; Wellcome Trust NR 47 TC 9 Z9 9 U1 0 U2 0 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0888-7543 J9 GENOMICS JI Genomics PD SEP 20 PY 1995 VL 29 IS 2 BP 478 EP 489 PG 12 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA RY055 UT WOS:A1995RY05500022 PM 8666398 ER PT J AU CALLEN, DF LANE, SA KOZMAN, H KREMMIDIOTIS, G WHITMORE, SA LOWENSTEIN, M DOGGETT, NA KENMOCHI, N PAGE, DC MAGLOTT, DR NIERMAN, WC MURAKAWA, K BERRY, R SIKELA, JM HOULGATTE, R AUFFRAY, C SUTHERLAND, GR AF CALLEN, DF LANE, SA KOZMAN, H KREMMIDIOTIS, G WHITMORE, SA LOWENSTEIN, M DOGGETT, NA KENMOCHI, N PAGE, DC MAGLOTT, DR NIERMAN, WC MURAKAWA, K BERRY, R SIKELA, JM HOULGATTE, R AUFFRAY, C SUTHERLAND, GR TI INTEGRATION OF TRANSCRIPT AND GENETIC MAPS OF CHROMOSOME-16 AT NEAR-1-MB RESOLUTION - DEMONSTRATION OF A HOT-SPOT FOR RECOMBINATION AT 16P12 SO GENOMICS LA English DT Article ID HUMAN GENOME; LOCALIZATION; ASSIGNMENT; EXPRESSION; LOCATION; CLONING; COMPLEX; BANDS AB A single mapping resource, a mouse/human somatic cell panel with average distance between breakpoints of 1.2 Mb and a potential resolution of 1 Mb, has been utilized to integrate the genetic map and a transcript map of human chromosome 16. This map includes 141 genetic markers and 200 genes and transcripts. The localization of four genes (CHEL3, TK2, TRG1, and MMP9) reported to map to chromosome 16 could not be confirmed, and for three of these localizations to other human chromosomes are reported. A correlation between genetic and physical distance over a region estimated to be 23 Mb on the short arm of chromosome 16 identified an interval demonstrating a greatly increased rate of recombination where, in females, 1 cM is equivalent to a physical distance of 100 kb. (C) 1995 Academic Press, Inc. C1 LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. MIT,HOWARD HUGHES MED INST,WHITEHEAD INST,CAMBRIDGE,MA 02142. MIT,DEPT BIOL,CAMBRIDGE,MA 02142. AMER TYPE CULTURE COLLECT,ROCKVILLE,MD. OSAKA UNIV,INST MOLEC & CELLULAR BIOL,OSAKA 565,JAPAN. UNIV COLORADO,HLTH SCI CTR,DEPT PHARMACOL,DENVER,CO 80262. GENETHON,GENEXPRESS,F-91002 EVRY,FRANCE. CNRS,UPR 420,F-94801 VILLEJUIF,FRANCE. RP CALLEN, DF (reprint author), WOMENS & CHILDRENS HOSP,DEPT CYTOGENET & MOLEC GENET,72 KING WILLIAM RD,ADELAIDE,SA 5006,AUSTRALIA. RI Sutherland, Grant/D-2606-2012; Callen, David/G-1975-2012; OI Callen, David/0000-0002-6189-9991 NR 50 TC 38 Z9 38 U1 0 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD SEP 20 PY 1995 VL 29 IS 2 BP 503 EP 511 PG 9 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA RY055 UT WOS:A1995RY05500025 PM 8666401 ER PT J AU YONG, WH UEKI, K CHOU, D REEVES, SA VONDEIMLING, A GUSELLA, JF MOHRENWEISER, HW BUCKLER, AJ LOUIS, DN AF YONG, WH UEKI, K CHOU, D REEVES, SA VONDEIMLING, A GUSELLA, JF MOHRENWEISER, HW BUCKLER, AJ LOUIS, DN TI CLONING OF A HIGHLY CONSERVED HUMAN PROTEIN SERINE-THREONINE PHOSPHATASE GENE FROM THE GLIOMA CANDIDATE REGION ON CHROMOSOME 19Q13.3 SO GENOMICS LA English DT Note ID HUMAN ASTROCYTOMAS AB Allelic loss studies have suggested that a glioma tumor suppressor gene resides in a 425-kb region of chromosome 19q, telomeric to D19S219 and centromeric to D19S112. Exon amplification of a cosmid contig spanning this region yielded four exons with high homology to a rat protein serine-threonine phosphatase from a cosmid approximately 100 kb telomeric to D19S219. Isolation of a near full-length cDNA from a human fetal brain cDNA library revealed a protein serine-threonine phosphatase with a tetratricopeptide motif, almost identical to human PPP5C (PP5) and highly homologous to rat PPT. Northern blotting demonstrated expression in most human tissues, including brain. Primary and cultured gliomas were studied for genetic alterations in this gene using pulsed-field gel electrophoresis, routine Southern blots, and genomic DNA- and RNA-based single-strand conformation polymorphism analysis. Genomic alterations were not detected in any of the gliomas, and all studied gliomas expressed the gene, suggesting that this phosphatase is not the putative chromosome 19q glioma tumor suppresser gene. (C) 1995 Academic Press, Inc. C1 MASSACHUSETTS GEN HOSP,DEPT PATHOL NEUROPATHOL,NEUROSURG SERV,MOLEC NEUROONCOL LAB,BOSTON,MA 02129. MASSACHUSETTS GEN HOSP,MOLEC NEUROGENET UNIT,BOSTON,MA 02129. HARVARD UNIV,SCH MED,BOSTON,MA 02129. UNIV HOSP BONN,INST NEUROPATHOL,BONN,GERMANY. LAWRENCE LIVERMORE NATL LAB,CTR HUMAN GENOME,LIVERMORE,CA 94550. RI von Deimling, Andreas/F-7774-2013 OI von Deimling, Andreas/0000-0002-5863-540X FU NCI NIH HHS [T32-CA90216, CA 57683] NR 19 TC 27 Z9 28 U1 0 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD SEP 20 PY 1995 VL 29 IS 2 BP 533 EP 536 PG 4 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA RY055 UT WOS:A1995RY05500028 PM 8666404 ER PT J AU ALKOFER, R BENDER, A ROBERTS, CD AF ALKOFER, R BENDER, A ROBERTS, CD TI PION LOOP CONTRIBUTION TO THE ELECTROMAGNETIC PION CHARGE RADIUS SO INTERNATIONAL JOURNAL OF MODERN PHYSICS A LA English DT Article ID CHIRAL PERTURBATION-THEORY; CONSTITUENT QUARK MASSES; FORM-FACTOR; QCD; MODEL; ELECTROPRODUCTION; ENERGY; VERTEX; SYMMETRY; GEV2 AB A phenomenological Dyson-Schwinger equation approach to QCD, formalized in terms of a QCD-based model field theory, is used to calculate the electromagnetic charge radius of the pion. The contributions from the core of dressed quarks and the pion loop are identified and compared. It is shown explicitly that the divergence of the charge radius in the chiral limit is due to the pion loop but that at m(pi) = 0.14 GeV this loop contributes less than 15% to (r(pi)(2)), i.e. the dressed quark core is the dominant determining characteristic for the pion. C1 ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. RP ALKOFER, R (reprint author), UNIV TUBINGEN,INST THEORET PHYS,MORGENSTELLE 14,D-72076 TUBINGEN,GERMANY. NR 47 TC 62 Z9 62 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-751X J9 INT J MOD PHYS A JI Int. J. Mod. Phys. A PD SEP 20 PY 1995 VL 10 IS 23 BP 3319 EP 3342 DI 10.1142/S0217751X95001601 PG 24 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA RW437 UT WOS:A1995RW43700005 ER PT J AU MILLER, NL AF MILLER, NL TI SENSITIVITY OF SURFACE HEAT AND MOISTURE FLUXES DUE TO TOPOGRAPHIC SLOPE AND AZIMUTH SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article AB Current surface vegetation atmospheric transfer (SVAT) models neglect the effects of surface slope and azimuth. There are significant subgrid differences in topographic features at the subgrid scales to which processes such as latent and sensible heating fluxes are sensitive. This study indicates the sensitivity of these processes due to sloping surfaces of varying azimuth (clockwise horizontal direction from north). A dynamically adaptive gridding system is implemented to determine subgrids based on surface slope and azimuth. A topographic index which accounts for four surface azimuth and five slope increments defines 21 characteristic types, including flat horizontal surfaces. A synthetic 10 km x 10 km watershed at latitude 38 degrees N and with a fixed diurnal cycle provides input for the surface temperature. Two fine grid meshes, 1.0 km x 1.0 km and 2 km x 2 km, are embedded within the larger-scale cell. Digital elevation data representing an area near Lake Tahoe, California, is also used in this sensitivity study of surface heat and moisture fluxes due to topographic forcing of incident radiation. A homogeneity test determines the minimum number of fine scale cells with matching characteristics and shared boundaries (but not strictly shared points) and forms groups of cells which represent regions of similar topographic characteristics. When the homogeneity test is set to 100% accuracy, there is a 72% reduction from individual fine grid cells to similar groups, while at 60% accuracy there is an 80% reduction, and at 10% accuracy there is a 99% reduction. Each group computes a SVAT with the group defined characteristic topography. A set of test cases using the Biosphere-Atmosphere Transfer Scheme (Dickinson et al., 1986) is presented for north, south, east, and west facing 10 degrees slopes with surfaces under dry and saturated conditions. The resulting latent heat fluxes are shown for grasslands and evergreen forests under dry and saturated conditions and for the synthetic watershed at varying degrees of accuracy. The Sierra topography is assumed to be all evergreen vegetation and dry. This study indicates that flat horizontal surfaces overpredict diurnally integrated, areally weighted sensible heat fluxes by 5 to 10% and latent heat fluxes by 1 to 2%. RP MILLER, NL (reprint author), LAWRENCE LIVERMORE NATL LAB, DIV GLOBAL CLIMATE RES, POB 808, LIVERMORE, CA 94550 USA. RI Miller, Norman/E-6897-2010 NR 16 TC 6 Z9 6 U1 0 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD SEP 20 PY 1995 VL 100 IS D9 BP 18669 EP 18685 DI 10.1029/95JD00386 PG 17 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA RV887 UT WOS:A1995RV88700005 ER PT J AU GILLANI, NV SCHWARTZ, SE LEAITCH, WR STRAPP, JW ISAAC, GA AF GILLANI, NV SCHWARTZ, SE LEAITCH, WR STRAPP, JW ISAAC, GA TI FIELD OBSERVATIONS IN CONTINENTAL STRATIFORM CLOUDS - PARTITIONING OF CLOUD PARTICLES BETWEEN DROPLETS AND UNACTIVATED INTERSTITIAL AEROSOLS SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID SIZE-DISTRIBUTION; LOS-ANGELES; CLIMATE; SULFATE; CHEMISTRY; SPECTRA; AIR; PRECIPITATION; MICROPHYSICS; NUCLEATION AB The partitioning of cloud particles between activated droplets and unactivated interstitial aerosols is a primary determinant of cloud microphysical, radiative, and chemical properties. In the present study, high-resolution aircraft measurements (1 s, similar to 60 m) of the number concentrations (N-amp and N-cd) of accumulation-mode particles (AMP, 0.17 to 2.07 mu m diameter) and cloud droplets (CD, 2 to 35 mu m diameter), made during 10 flights in and around continental stratiform clouds near Syracuse, New York, in autumn 1984 have been used to study the local and instantaneous nature of cloud particle partitioning throughout the sampled clouds. The partitioning is defined as the activated fraction F (= N-cd/N-tot) of all measured cloud particles (N-tot = N-amp + N-cd). F may be interpreted approximately as the AMP activation efficiency which is often assumed to be unity in all clouds. In the present study, F varied over its full possible range (0 to 1), being low especially in cloud edges. Even in the near-adiabatic parts of cloud interior, its variation ranged from 0.1 to 1 over the 10 days. Statistically, its value in cloud interior exceeded 0.9 in 36% of the data but was below 0.6 in 28%. On 5 of the 10 days, stratocumulus clouds were embedded in cool, dry, and relatively clean (N-tot < 600 cm(-3)) northerly air masses. In such cases, cloud droplet concentration increased approximately linearly with increasing total particle loading, and F in cloud interior was near unity and relatively insensitive to changes in the influencing variables. On the other clays, especially in stratus clouds embedded in warm and polluted southerly air masses, F was significantly less than unity, with particles in the smallest size ranges (0.17 to 0.37 mu m) activating only fractionally depending on several factors. An important feature of the clouds sampled in this study was the existence of multiple cloud layers and complex vertical thermal structure on most days. Consequently, our analysis of the dependence of F on influencing cloud variables has been based on data grouped into individual cloud layers. Besides the size of the precursor aerosol, we found total particle loading (N-tot) and the local vertical cooling rate (similar to temperature lapse rate in individual layers) to influence F the most. In particular, F decreased with increasing particle loading in excess of about 800 cm(-3), and increased nearly linearly with temperature lapse rate. Evidently, the activation process can become self-limiting in stratiform clouds under polluted conditions, in which case increasing anthropogenic aerosol loading of the atmosphere translates less and less into cloud droplet population. This observation has important implications with respect to cloud radiative forcing, precipitation formation and acidification, and for long range transport of the unactivated aerosols. C1 ATMOSPHER ENVIRONM SERV, DOWNSVIEW, ON M3H 5T4, CANADA. RP GILLANI, NV (reprint author), BROOKHAVEN NATL LAB, DEPT APPL SCI, DIV ENVIRONM CHEM, UPTON, NY 11973 USA. RI Schwartz, Stephen/C-2729-2008 OI Schwartz, Stephen/0000-0001-6288-310X NR 55 TC 47 Z9 47 U1 1 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD SEP 20 PY 1995 VL 100 IS D9 BP 18687 EP 18706 DI 10.1029/95JD01170 PG 20 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA RV887 UT WOS:A1995RV88700006 ER PT J AU ARNEY, DSJ BURNS, CJ AF ARNEY, DSJ BURNS, CJ TI SYNTHESIS AND PROPERTIES OF HIGH-VALENT ORGANOURANIUM COMPLEXES CONTAINING TERMINAL ORGANOIMIDO AND OXO FUNCTIONAL-GROUPS - A NEW CLASS OF ORGANO-F-ELEMENT COMPLEXES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID X-RAY STRUCTURE; TRAPPING REACTIONS; IMIDO COMPLEXES; CATALYTIC HYDROAMINATION; ELECTRONIC-STRUCTURE; OXIDATIVE ADDITION; NITRENE COMPLEXES; DATIVE LIGANDS; CHEMISTRY; GENERATION AB Monoimido derivatives of uranium(IV) have been prepared by both metathesis and direct protonation routes. The reaction of lithium anilide with (eta(5)-C(5)Me(5))(2)UMeCl in the presence of tetramethylethylenediamine (TMED) results in the isolation of the salt [Li(TMED)][eta(5)-C(5)Me(5))(2)U(NC6H5)Cl] (1). Compound 1 crystallizes in the space group P3(2), with unit cell dimensions a = 17.545(2) Angstrom, c = 9.407(2) Angstrom, V = 2507.8(7) Angstrom(3), Z = 3. Metathesis reactions with potassium anilide salts similarly result in the formation of monoimido chloride anionic derivatives of U(IV); these can be converted to neutral base adducts by reaction with the appropriate Lewis base at room temperature. A more direct route to the formation of neutral organoimido species with sterically encumbered aryl substituents is the reaction of (eta(5)-C(5)Me(5))(2)UMe(2) with 1 equiv H2NAr (Ar = 2,6-diisopropylphenyl or 2,4,6-tri-tert-butylphenyl). The base-free 2,6-diisopropyl derivative is highly soluble in all solvents, and the product of this protonation is best isolated as a base adduct, (eta(5)-C(5)Me(5))(2)U(N-2,6-i-Pr2C6H3)(THF) (6). The 2,4,6-tri-tert-butylphenylaniline product does not react further with tetrahydrofuran, however, and may be isolated as the base-free imido complex (eta(5)-C-5-Me(5))(2)U(N-2,4,6-t-Bu(3)C(6)H(2)) (8) Compound 8 crystallizes in the space group Pmn2(1), with unit cell dimensions a = 13.450(5) Angstrom, b = 12.138(5) Angstrom, c = 10.510(3) Angstrom, V = 1715.9(10) Angstrom(3), Z = 2. All of the organoimido compounds of uranium(IV) exhibit rich chemistry with two electron oxidative atom transfer reagents, providing an entirely new class of organouranium(VI) complexes containing terminal imido and oxo functional groups. Bis(imido) complexes such as (eta(5)-C(5)M(5))(2)U(NC6H5)(2) (3) can also be prepared by the unprecedented intramolecular reductive cleavage of 1,2-diphenylhydrazine at a uranium(IV) center. These complexes are in general surprisingly unreactive, but compound 3 will effect the unprecedented homolytic cleavage of dihydrogen to yield a bis(amide) derivative. The physical properties and chemical stability of these species suggests that significant uranium-imido and -oxo multiple bond character is present. C1 LOS ALAMOS NATL LAB, DIV CHEM SCI & TECHNOL, LOS ALAMOS, NM 87545 USA. NR 99 TC 165 Z9 165 U1 0 U2 19 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD SEP 20 PY 1995 VL 117 IS 37 BP 9448 EP 9460 DI 10.1021/ja00142a011 PG 13 WC Chemistry, Multidisciplinary SC Chemistry GA RW496 UT WOS:A1995RW49600011 ER PT J AU OVERBURY, SH LYMAN, PF MULLINS, DR SHINN, ND AF OVERBURY, SH LYMAN, PF MULLINS, DR SHINN, ND TI CORE-LEVEL PHOTOEMISSION AND ALKALI ION-SCATTERING STRUCTURE-ANALYSIS OF NI ADSORPTION AND SURFACE ALLOYING ON W(001) SO SURFACE SCIENCE LA English DT Article DE LOW ENERGY ION SCATTERING (LEIS); METAL-METAL INTERFACES; NICKEL; SINGLE CRYSTAL SURFACES; SOFT X-RAY PHOTOELECTRON SPECTROSCOPY; SURFACE STRUCTURE; TUNGSTEN ID BINDING-ENERGY SHIFTS; PHOTOELECTRON DIFFRACTION; SPECTROSCOPY; W(100); W(110); ATOMS; OVERLAYERS; CHEMISORPTION; DIFFUSION AB The growth and structural evolution of Ni overlayers deposited on W(001) are studied by low energy alkali ion scattering and W 4f(7/2) core-level photoemission. The composition and thermal stability of the interfacial layers are found to vary with nickel coverage. For sub-monolayer Ni coverages deposited near 300 K, annealing to 1000 K leads to a random alloy in the surface layer with W atoms protruding above the Ni atoms by approximately 0.022 nm. At Ni coverages near one monolayer, the surface layer is a nearly pure, pseudomorphic nickel overlayer 0.125 nm above the underlying W substrate. A second pseudomorphic nickel layer can be grown at 300 K but annealing results in intermixing at the buried interface. At 2 monolayers (ML) coverage, the uppermost two atomic layers are mostly nickel. Fitting of the W 4f(7/2) photoemission spectra requires three components: an invariant bulk component, a surface component at lower binding energy, and a third component at intermediate binding energy. The surface component intensity decreases linearly to zero as the nickel coverage approaches 1 ML, indicating that this component originates from coordinatively unsaturated W atoms in the alloyed top layer. The intermediate component, present at all coverages, is assigned to coordinatively saturated atoms in the layer below the alloyed top layer for coverages between 0-1 ML, and below the Ni layer at 1 ML. Variation in the binding energy of the intermediate component is observed during growth of the second pseudomorphic Ni overlayer. The correlation of structural and electronic information shows that coordination and interfacial strain dominate charge transfer in determining core-level shifts. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP OVERBURY, SH (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37932, USA. RI Overbury, Steven/C-5108-2016 OI Overbury, Steven/0000-0002-5137-3961 NR 35 TC 8 Z9 8 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD SEP 20 PY 1995 VL 339 IS 1-2 BP 68 EP 82 DI 10.1016/0039-6028(95)00556-0 PG 15 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA RV213 UT WOS:A1995RV21300009 ER PT J AU SHULTZ, AN JANG, W HETHERINGTON, WM BAER, DR WANG, LQ ENGELHARD, MH AF SHULTZ, AN JANG, W HETHERINGTON, WM BAER, DR WANG, LQ ENGELHARD, MH TI COMPARATIVE 2ND-HARMONIC GENERATION AND X-RAY PHOTOELECTRON-SPECTROSCOPY STUDIES OF THE UV CREATION AND O-2 HEALING OF TI3+ DEFECTS ON (110)RUTILE TIO2 SURFACES SO SURFACE SCIENCE LA English DT Article DE CHEMISORPTION; 2ND-HARMONIC GENERATION; SURFACE DEFECTS; SURFACE ELECTRONIC PHENOMENA; SURFACE STRUCTURE; TITANIUM OXIDE; X-RAY PHOTOELECTRON SPECTROSCOPY ID ELECTRON-SPECTROSCOPY; TIO2(110) SURFACES; OXIDE SURFACES; HYDROGEN; CRYSTAL; STATES; OXYGEN AB SHG studies on polished and etched (110) rutile TiO2 single-crystal surfaces suggest that above band gap, low-energy (4.7 eV) ultraviolet photons create stable Ti3+ surface defects in UHV. Such defects can be healed by subsequently exposing the surface to O-2 gas. These results are similar to recently reported measurements on polished and etched (001) rutile single-crystal surfaces. Observations on the (001) surfaces were interpreted as the photodesorption and re-adsorption of molecular oxygen bound loosely to Ti3+ defects on the surface as a Ti4+:O-2(-) complex. For the current (110) study, XPS was used to confirm the defect type and to quantify the density of Ti3+ defects created. Defects on the surfaces studied using XPS were generated using photons of even lower energy (3.4 eV), indicating that the oxygen species removed was very loosely bound. The same defect creation and healing processes were also observed on a nearly defect-free thermally annealed single-crystal surface using XPS. Whether bridging oxygen ions on the (110) surface or O-2(-) tons are the photo-labile species has yet to be determined. Transient photodesorption of O-2 at high oxygen pressure also was observed using SHG. SHG has proven to be a sensitive probe of surface defects, consistent with XPS results, under conditions ranging from UHV to atmospheric. C1 OREGON STATE UNIV, DEPT PHYS, CORVALLIS, OR 97331 USA. PACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, RICHLAND, WA 99352 USA. PACIFIC NW LAB, CTR MATH & CHEM SCI, RICHLAND, WA 99352 USA. RI Engelhard, Mark/F-1317-2010; Baer, Donald/J-6191-2013; OI Baer, Donald/0000-0003-0875-5961; Engelhard, Mark/0000-0002-5543-0812 NR 28 TC 100 Z9 102 U1 4 U2 28 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD SEP 20 PY 1995 VL 339 IS 1-2 BP 114 EP 124 DI 10.1016/0039-6028(95)00650-8 PG 11 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA RV213 UT WOS:A1995RV21300013 ER PT J AU BATTEAS, JD BARBIERI, A STARKEY, EK VANHOVE, MA SOMORJAI, GA AF BATTEAS, JD BARBIERI, A STARKEY, EK VANHOVE, MA SOMORJAI, GA TI THE RH(110)-P2MG(2X1)-2O SURFACE-STRUCTURE DETERMINED BY AUTOMATED TENSOR LEED - STRUCTURE CHANGES WITH OXYGEN COVERAGE SO SURFACE SCIENCE LA English DT Article DE ADATOMS; CHEMISORPTION; LOW ENERGY ELECTRON DIFFRACTION (LEED); METALLIC SURFACES; OXYGEN; RHODIUM; SURFACE RELAXATION AND RECONSTRUCTION ID ENERGY ELECTRON-DIFFRACTION; MISSING-ROW RECONSTRUCTION; ABSORPTION FINE-STRUCTURE; ION-SCATTERING; RH(110); CU(110); SYSTEM; PHASE AB Oxygen is dissociatively chemisorbed on Rh(110) and forms an ordered (2 X 1) surface structure at one monolayer coverage. The automated tenser LEED approach has been applied to the determination of atomic positions in the Rh(110)-p2mg(2 X 1)-20 structure. The oxygen atoms are confirmed to be in a zig-zag fashion in the (110) troughs to produce the glide plane symmetry observed in the LEED pattern. The clean surface interlayer relaxations are reduced and the oxygen atoms are bound asymmetrically in the three-fold fee hollow-sites to the (111) facets of the steps. Two Rh-O bonds are formed to Rh atoms in the top metal layer with bond lengths of 1.86 +/- 0.11 Angstrom and a third Rh-O bond of 2.07 +/- 0.16 Angstrom is formed to a Rh atom in the second metal layer. A novel finding is that the second metal layer Rh atoms are shifted towards the oxygen positions, introducing a zig-zag lateral displacement of the atoms in the row by 0.10 +/- 0.07 Angstrom. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV SCI MAT,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RI Van Hove, Michel/A-9862-2008; Batteas, James/D-4144-2015 OI Van Hove, Michel/0000-0002-8898-6921; Batteas, James/0000-0002-6244-5000 NR 29 TC 33 Z9 33 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD SEP 20 PY 1995 VL 339 IS 1-2 BP 142 EP 150 DI 10.1016/0039-6028(95)00652-4 PG 9 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA RV213 UT WOS:A1995RV21300016 ER PT J AU ABURANO, RD HONG, HW ROESLER, JM LIN, DS CHIANG, TC ZSCHACK, P AF ABURANO, RD HONG, HW ROESLER, JM LIN, DS CHIANG, TC ZSCHACK, P TI X-RAY STUDY OF THE AG/SI(III) INTERFACE SO SURFACE SCIENCE LA English DT Letter DE METAL-SEMICONDUCTOR INTERFACES; SILICON; SILVER; SURFACE RELAXATION AND RECONSTRUCTION ID SCHOTTKY-BARRIER; SURFACE; DIFFRACTION; SCATTERING AB X-ray diffraction was employed to study the structure of the Ag/Si(111) interface. Samples were prepared by vacuum deposition of Ag onto Si(111)-(7 x 7) followed by either annealing to 400 degrees C or no anneal. The annealed and unannealed samples show significantly different Si-substrate truncation-rod intensity profiles. The results are explained in terms of structural features of the (7 x 7) reconstruction for the unannealed sample and a fairly abrupt (1 x 1) interface for the annealed sample. C1 UNIV ILLINOIS, MAT RES LAB, URBANA, IL 61801 USA. UNIV ILLINOIS, DEPT PHYS, URBANA, IL 61801 USA. OAK RIDGE INST SCI & EDUC, OAK RIDGE, TN 37831 USA. RI Lin, Dengsung/A-4127-2009; Chiang, Tai/H-5528-2011 NR 13 TC 3 Z9 4 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 EI 1879-2758 J9 SURF SCI JI Surf. Sci. PD SEP 20 PY 1995 VL 339 IS 1-2 BP L891 EP L896 DI 10.1016/0039-6028(95)00640-0 PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA RV213 UT WOS:A1995RV21300001 ER PT J AU SANDBERG, WS SCHLUNK, PM ZABIN, HB TERWILLIGER, TC AF SANDBERG, WS SCHLUNK, PM ZABIN, HB TERWILLIGER, TC TI RELATIONSHIP BETWEEN IN-VIVO ACTIVITY AND IN-VITRO MEASURES OF FUNCTION AND STABILITY OF A PROTEIN SO BIOCHEMISTRY LA English DT Article ID GENE-V-PROTEIN; DNA-BINDING-PROTEIN; TEMPERATURE-SENSITIVE MUTATIONS; FILAMENTOUS BACTERIOPHAGE-IKE; SPIN-LABELED OLIGONUCLEOTIDE; AMINO-ACID SUBSTITUTIONS; TRANSLATIONAL REGULATION; HYDROPHOBIC CORE; LAMBDA-REPRESSOR; II PROTEIN AB The in vivo activities of mutant proteins are readily measured and can potentially be used to estimate changes in in vitro properties such as stability or function, but this connection has not been rigorously established. Gene V protein is a small protein produced by bacteriophage fl that binds to single-stranded DNA and to RNA and for which fitness can be assayed both in vivo and in vitro. We have assembled a large number of temperature-sensitive mutants of the gene V protein of bacteriophage fl and measured their ability to support phage growth and replication in vivo. We have also purified many of these mutant gene V proteins and measured their stabilities and ssDNA binding affinities in vitro. Mutations at surface residues frequently yielded temperature-sensitive mutants, but remarkably, no overall correlation between in vivo activity and in vitro measures of either stability or function was found for this group, Mutations at buried residues often lead to the temperature-sensitive phenotype. At buried sites temperature sensitivity was strongly correlated with in vitro stability changes, but not with in vitro ssDNA binding affinity. The implication of these observations for protein engineering efforts is that phenotypes conferred by amino acid substitutions at buried sites can be used to identify mutants whose stabilities fall into ranges of interest, while phenotypes of mutants with surface substitutions may be much less readily interpreted, even in the case of a single-stranded-DNA-binding protein. C1 UNIV CHICAGO,DEPT BIOCHEM & MOLEC BIOL,CHICAGO,IL 60637. UNIV CHICAGO,DEPT MED,CHICAGO,IL 60637. LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. RI Terwilliger, Thomas/K-4109-2012; OI Terwilliger, Thomas/0000-0001-6384-0320; Sandberg, Warren/0000-0002-9246-777X NR 54 TC 16 Z9 16 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD SEP 19 PY 1995 VL 34 IS 37 BP 11970 EP 11978 DI 10.1021/bi00037a039 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA RX003 UT WOS:A1995RX00300039 PM 7547934 ER PT J AU JIA, QX WU, XD FOLTYN, SR FINDIKOGLU, AT TIWARI, P ZHENG, JP JOW, TR AF JIA, QX WU, XD FOLTYN, SR FINDIKOGLU, AT TIWARI, P ZHENG, JP JOW, TR TI HETEROEPITAXIAL GROWTH OF HIGHLY CONDUCTIVE METAL-OXIDE RUO2 THIN-FILMS BY PULSED-LASER DEPOSITION SO APPLIED PHYSICS LETTERS LA English DT Article ID CHEMICAL-VAPOR-DEPOSITION; RUTHENIUM DIOXIDE; FATIGUE; IRO2 AB Highly conductive ruthenium oxide (RuO2) has been epitaxially grown on LaAlO3 substrates by pulsed laser deposition. The RuO2 film is (hOO) oriented normal to the substrate surface. The heteroepitaxial growth of RuO2 on LaAlO3 is demonstrated by the strong in-plane orientation of thin films with respect to the major axes of the substrate. High crystallinity of RuO2 thin films is also determined from Rutherford backscattering channeling measurements. Electrical measurements on the RuO2 thin films demonstrate a quite low room-temperature resistivity of 35+/-2 mu Omega cm at deposition temperatures of above 500 degrees C. (C) 1995 American Institute of Physics. C1 USA,RES LAB,ELECTR & POWER SOURCES DIRECTORATE,FT MONMOUTH,NJ 07703. RP JIA, QX (reprint author), LOS ALAMOS NATL LAB,CTR SUPERCONDUCT TECHNOL,LOS ALAMOS,NM 87545, USA. RI Jia, Q. X./C-5194-2008 NR 22 TC 33 Z9 33 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 18 PY 1995 VL 67 IS 12 BP 1677 EP 1679 DI 10.1063/1.115054 PG 3 WC Physics, Applied SC Physics GA RV180 UT WOS:A1995RV18000014 ER PT J AU WARREN, WL DIMOS, D PIKE, GE VANHEUSDEN, K RAMESH, R AF WARREN, WL DIMOS, D PIKE, GE VANHEUSDEN, K RAMESH, R TI ALIGNMENT OF DEFECT DIPOLES IN POLYCRYSTALLINE FERROELECTRICS SO APPLIED PHYSICS LETTERS LA English DT Article ID DOMAIN STABILIZATION; BATIO3 AB Using electron paramagnetic resonance (EPR), we show the alignment of defect dipoles along the direction of the spontaneous polarization in polycrystalline BaTiO3 ceramics by subjecting the capacitors to a de bias at elevated temperatures. The alignment is demonstrated to occur via orientation dependent EPR signals in the polycrystalline perovskite lattice. The alignment of the defect dipoles is found to strongly enhance the Light sensitivity of the defects. This observation may have important implications for photorefractive applications. (C) 1995 American Institute of Physics. C1 UNIV MARYLAND,DEPT MAT & NUCL ENGN,COLLEGE PK,MD 20742. RP WARREN, WL (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 14 TC 85 Z9 85 U1 1 U2 24 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 18 PY 1995 VL 67 IS 12 BP 1689 EP 1691 DI 10.1063/1.115058 PG 3 WC Physics, Applied SC Physics GA RV180 UT WOS:A1995RV18000018 ER PT J AU KELLERMAN, BK CHASON, E FLORO, JA PICRAUX, ST WHITE, JM AF KELLERMAN, BK CHASON, E FLORO, JA PICRAUX, ST WHITE, JM TI THE ROLE OF TRANSIENT ION-INDUCED DEFECTS IN ION-BEAM-ASSISTED GROWTH SO APPLIED PHYSICS LETTERS LA English DT Article ID EPITAXIAL-GROWTH; SIMULATIONS AB Low-energy ion bombardment, concurrent with growth, can control and improve many aspects of film growth, but confirming the atomistic mechanism responsible for these effects has been difficult. We present a simple picture of ion beam-assisted deposition as the interaction of growth-induced and ion-induced surface defects (adatoms and vacancies). We use kinetic Monte Carlo simulations to demonstrate that low-energy ion bombardment in conjunction with growth produces a smoother surface morphology than either growth or ion bombardment alone by destabilizing surface clusters and promoting step flow growth. (C) 1995 American Institute of Physics. C1 UNIV TEXAS,CTR SCI & TECHNOL,AUSTIN,TX 78712. RP KELLERMAN, BK (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 13 TC 14 Z9 14 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 18 PY 1995 VL 67 IS 12 BP 1703 EP 1705 DI 10.1063/1.115022 PG 3 WC Physics, Applied SC Physics GA RV180 UT WOS:A1995RV18000023 ER PT J AU ERES, G AF ERES, G TI KINETIC MODELING OF THE ATOMIC LAYER EPITAXY PROCESSING WINDOW IN GROUP-IV SEMICONDUCTOR GROWTH SO APPLIED PHYSICS LETTERS LA English DT Article ID THIN-FILM GROWTH; GERMANIUM; MECHANISMS; DESORPTION; SILICON; SI AB A kinetic model based on two elementary reaction steps was used for exploring the prospects of atomic layer epitaxy (ALE) on the (100) surface of group IV semiconductors using hydridic source gases. Equating the chemisorption step with depletion of active sites, and the molecular hydrogen desorption step with regeneration of active sites allowed first-principles kinetic modeling of the trends in thin film growth, unencumbered by the lack of mechanistic details of chemisorption and surface decomposition. The combination of first-order depletion and first-order regeneration steps was found to be most favorable for achieving ALE type behavior. The model shows that the ALE window is highly sensitive to the duration of the depletion (chemisorption) cycle suggesting short duration and well defined pulses as the most effective method of source gas delivery. (C) 1995 American Institute of Physics. RP ERES, G (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,BLDG 2000,MS 6056,OAK RIDGE,TN 37831, USA. RI Eres, Gyula/C-4656-2017 OI Eres, Gyula/0000-0003-2690-5214 NR 15 TC 6 Z9 6 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 18 PY 1995 VL 67 IS 12 BP 1727 EP 1729 DI 10.1063/1.115030 PG 3 WC Physics, Applied SC Physics GA RV180 UT WOS:A1995RV18000031 ER PT J AU BARDAKCI, K BERNARDO, LM AF BARDAKCI, K BERNARDO, LM TI THE CONFORMAL POINTS OF THE GENERALIZED THIRRING MODEL-II SO NUCLEAR PHYSICS B LA English DT Article ID 2 DIMENSIONS; INVARIANCE; FIELDS AB In the large-N limit, conditions for the conformal invariance of the generalized Thirring model are derived, using two different approaches: the background field method and the hamiltonian method based on an operator algebra, and the agreement between them is established. A free field representation of the relevant algebra is presented, and the structure of the stress tenser in terms of free fields (and free currents) is studied in detail. RP BARDAKCI, K (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720, USA. NR 17 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD SEP 18 PY 1995 VL 450 IS 3 BP 695 EP 712 DI 10.1016/0550-3213(95)00324-L PG 18 WC Physics, Particles & Fields SC Physics GA RV597 UT WOS:A1995RV59700008 ER PT J AU CHAUDHURI, S HOCKNEY, G LYKKEN, J AF CHAUDHURI, S HOCKNEY, G LYKKEN, J TI MAXIMALLY SUPERSYMMETRIC STRING THEORIES IN D-LESS-THAN-10 SO PHYSICAL REVIEW LETTERS LA English DT Article ID TOROIDAL COMPACTIFICATION; TOPOLOGICAL CHARGES; LIGHT-CONE; MONOPOLES AB The existence of maximally supersymmetric solutions to heterotic string theory that are not toroidal compactifications of the ten-dimensional superstring is established. We construct an exact fermionic realization of an N = 1 supersymmetric string theory in D = 8 with non-simply-laced gauge group Sp(20). Toroidal compactification to six and four dimensions gives maximally extended supersymmetric theories with reduced rank (4, 12) and (6, 14), respectively. C1 FERMILAB NATL ACCELERATOR LAB, DEPT THEORET PHYS, BATAVIA, IL 60510 USA. RP CHAUDHURI, S (reprint author), UNIV CALIF SANTA BARBARA, INST THEORET PHYS, SANTA BARBARA, CA 93106 USA. NR 24 TC 102 Z9 102 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 18 PY 1995 VL 75 IS 12 BP 2264 EP 2267 DI 10.1103/PhysRevLett.75.2264 PG 4 WC Physics, Multidisciplinary SC Physics GA RU811 UT WOS:A1995RU81100003 ER PT J AU GUESSOUS, A SCHULZ, N PHILLIPS, WR AHMAD, I BENTALEB, M DURELL, JL JONES, MA LEDDY, M LUBKIEWICZ, E MORSS, LR PIEPENBRING, R SMITH, AG URBAN, W VARLEY, BJ AF GUESSOUS, A SCHULZ, N PHILLIPS, WR AHMAD, I BENTALEB, M DURELL, JL JONES, MA LEDDY, M LUBKIEWICZ, E MORSS, LR PIEPENBRING, R SMITH, AG URBAN, W VARLEY, BJ TI HARMONIC 2-PHONON GAMMA-VIBRATIONAL STATE IN NEUTRON-RICH MO-106 SO PHYSICAL REVIEW LETTERS LA English DT Article ID DEFORMED-NUCLEI; BANDS AB The neutron-rich Mo-106 nucleus has been studied by prompt gamma-ray spectroscopy following the spontaneous fission of Cm-248. The characteristics of the rotational band built on a state at 1435 keV identifies the band head as the best candidate for a harmonic double-phonon K-pi = 4(+) gamma-vibrational state observed so far. C1 UNIV MANCHESTER,DEPT PHYS,MANCHESTER M13 9PL,LANCS,ENGLAND. ARGONNE NATL LAB,ARGONNE,IL 60439. UJF,CNRS,IN2P3,INST NUCL SCI,F-38026 GRENOBLE,FRANCE. FAC SCI KENITRA,PHYS NUCL APPL LAB,KENITRA,MOROCCO. JAGIELLONIAN UNIV,KRAKOW,POLAND. RP GUESSOUS, A (reprint author), UNIV STRASBOURG 1,CNRS,IN2P3,CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. NR 15 TC 80 Z9 83 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 18 PY 1995 VL 75 IS 12 BP 2280 EP 2283 DI 10.1103/PhysRevLett.75.2280 PG 4 WC Physics, Multidisciplinary SC Physics GA RU811 UT WOS:A1995RU81100007 ER PT J AU DAW, CS FINNEY, CEA VASUDEVAN, M VANGOOR, NA NGUYEN, K BRUNS, DD KOSTELICH, EJ GREBOGI, C OTT, E YORKE, JA AF DAW, CS FINNEY, CEA VASUDEVAN, M VANGOOR, NA NGUYEN, K BRUNS, DD KOSTELICH, EJ GREBOGI, C OTT, E YORKE, JA TI SELF-ORGANIZATION AND CHAOS IN A FLUIDIZED-BED SO PHYSICAL REVIEW LETTERS LA English DT Article AB We present experimental evidence that a complex system of particles suspended by upward-moving gas can exhibit low-dimensional bulk behavior. Specifically, we describe large-scale collective particle motion referred to as slugging in an industrial device known as a fluidized bed. As gas flow increases from zero, the bulk motion evolves from a fixed point to periodic oscillations to oscillations intermittently punctuated by ''stutters,'' which become more frequent as the flow increases further. At the highest flow tested, the behavior becomes extremely complex (''turbulent''). C1 UNIV TENNESSEE,KNOXVILLE,TN 37996. ARIZONA STATE UNIV,TEMPE,AZ 85287. UNIV MARYLAND,COLLEGE PK,MD 20742. RP DAW, CS (reprint author), OAK RIDGE NATL LAB,DIV ENGN TECHNOL,POB 2009,OAK RIDGE,TN 37831, USA. RI O, E/F-1630-2015 NR 8 TC 74 Z9 78 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 18 PY 1995 VL 75 IS 12 BP 2308 EP 2311 DI 10.1103/PhysRevLett.75.2308 PG 4 WC Physics, Multidisciplinary SC Physics GA RU811 UT WOS:A1995RU81100014 ER PT J AU PEYSER, TA MILLER, PL STRY, PE BUDIL, KS BURKE, EW WOJTOWICZ, DA GRISWOLD, DL HAMMEL, BA PHILLION, DW AF PEYSER, TA MILLER, PL STRY, PE BUDIL, KS BURKE, EW WOJTOWICZ, DA GRISWOLD, DL HAMMEL, BA PHILLION, DW TI MEASUREMENT OF RADIATION-DRIVEN SHOCK-INDUCED MIXING FROM NONLINEAR INITIAL PERTURBATIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID RAYLEIGH-TAYLOR INSTABILITY; INTERFACE; LASER AB We present the first experimental measurement of the growth of a mixing region at a density interface from a high-amplitude, initially nonlinear perturbation. Thermal radiation from a gold Hohlraum irradiated by the Nova laser was used to drive a shock across a perturbed plastic-foam interface in a cylindrical shock tube attached to the Hohlraum. When the effects of target decompression are removed, the width of the mix region was found to grow logarithmically with time- in agreement with recent theories for the nonlinear phase of the Richtmyer-Meshkov instability. RP PEYSER, TA (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. RI Miller, Paul/E-6880-2013 NR 25 TC 30 Z9 30 U1 4 U2 11 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 18 PY 1995 VL 75 IS 12 BP 2332 EP 2335 DI 10.1103/PhysRevLett.75.2332 PG 4 WC Physics, Multidisciplinary SC Physics GA RU811 UT WOS:A1995RU81100020 ER PT J AU FU, GY CHENG, CZ BUDNY, R CHANG, Z DARROW, DS FREDRICKSON, E MAZZUCATO, E NAZIKIAN, R ZWEBEN, S AF FU, GY CHENG, CZ BUDNY, R CHANG, Z DARROW, DS FREDRICKSON, E MAZZUCATO, E NAZIKIAN, R ZWEBEN, S TI STABILITY ANALYSIS OF TOROIDICITY-INDUCED ALFVEN EIGENMODES IN TFTR DEUTERIUM-TRITIUM EXPERIMENTS SO PHYSICAL REVIEW LETTERS LA English DT Article ID FUSION ALPHA-PARTICLES; TOKAMAK; INSTABILITIES; EXCITATION AB The toroidicity-induced Alfven eigenmodes (TAE) are found to be stable in the Tokamak Fusion Test Reactor (TFTR) deuterium-tritium plasmas. The dominant stabilizing mechanisms are beam ion Landau damping and radiative damping. A core localized TAE mode is shown to exist near the center of the plasma at small magnetic shear and finite plasma beta, which can be destabilized by energetic alpha particles in future TFTR DT experiments. With additional instability drive from fast minority ions powered by ion cyclotron radio frequency, both the global and core localized TAE modes can be readily destabilized. RP FU, GY (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI Cheng, Chio/K-1005-2014 NR 18 TC 42 Z9 42 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 18 PY 1995 VL 75 IS 12 BP 2336 EP 2339 DI 10.1103/PhysRevLett.75.2336 PG 4 WC Physics, Multidisciplinary SC Physics GA RU811 UT WOS:A1995RU81100021 ER PT J AU REZNIK, D KEIMER, B DOGAN, F AKSAY, IA AF REZNIK, D KEIMER, B DOGAN, F AKSAY, IA TI Q-DEPENDENCE OF SELF-ENERGY EFFECTS OF THE PLANE OXYGEN VIBRATION IN YBA2CU3O7 SO PHYSICAL REVIEW LETTERS LA English DT Article ID INELASTIC NEUTRON-SCATTERING; HIGH-TC SUPERCONDUCTORS; PHONONS; GAP AB We have measured the temperature dependence of the peak position and linewidth of the 42.5 meV phonon branch in a twinned single crystal of YBa2Cu3O7 as a function of wave vector q. In the (100)/(010) direction in the Brillouin zone, considerable softening and broadening occur below the superconducting transition temperature T-c at some values of q. We observe an order of magnitude smaller softening and no linewidth broadening for q in the (110)/(1(1) over bar0$) direction. Possible implications of these findings for the symmetry of the superconducting order parameter are discussed. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544. PRINCETON UNIV,DEPT CHEM ENGN,PRINCETON,NJ 08544. RP REZNIK, D (reprint author), NIST,MAT SCI LAB,GAITHERSBURG,MD 20899, USA. RI Aksay, Ilhan/B-9281-2008 NR 17 TC 48 Z9 48 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 18 PY 1995 VL 75 IS 12 BP 2396 EP 2399 DI 10.1103/PhysRevLett.75.2396 PG 4 WC Physics, Multidisciplinary SC Physics GA RU811 UT WOS:A1995RU81100036 ER PT J AU ABULAFIA, Y SHAULOV, A WOLFUS, Y PROZOROV, R BURLACHKOV, L YESHURUN, Y MAJER, D ZELDOV, E VINOKUR, VM AF ABULAFIA, Y SHAULOV, A WOLFUS, Y PROZOROV, R BURLACHKOV, L YESHURUN, Y MAJER, D ZELDOV, E VINOKUR, VM TI LOCAL MAGNETIC-RELAXATION IN HIGH-TEMPERATURE SUPERCONDUCTORS SO PHYSICAL REVIEW LETTERS LA English DT Article ID FLUX-CREEP; YBA2CU3O7; CRYSTAL; TC AB A novel Hall probe array technique is used to measure the spatial distribution and time dependence of the magnetic induction in YBa2Cu3O7-delta crystals. Analysis of the data based on the flux diffusion equation allows a direct, model-independent determination of the local activation energy U and the logarithmic time scale to for flux creep. The results indicate that the spatial variations of U are small (+/-kT) and that U increases logarithmically with time. The time t(0) is inversely proportional to the field and it exhibits a nonmonotonic temperature dependence. These results confirm theoretical predictions based on the logarithmic solution of the flux diffusion equation. C1 WEIZMANN INST SCI,DEPT CONDENSED MATTER PHYS,IL-76100 REHOVOT,ISRAEL. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP ABULAFIA, Y (reprint author), BAR ILAN UNIV,DEPT PHYS,IL-52900 RAMAT GAN,ISRAEL. RI Prozorov, Ruslan/A-2487-2008; Zeldov, Eli/K-1546-2012 OI Prozorov, Ruslan/0000-0002-8088-6096; Zeldov, Eli/0000-0002-8200-4974 NR 23 TC 91 Z9 91 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 18 PY 1995 VL 75 IS 12 BP 2404 EP 2407 DI 10.1103/PhysRevLett.75.2404 PG 4 WC Physics, Multidisciplinary SC Physics GA RU811 UT WOS:A1995RU81100038 ER PT J AU LOPEZ, D SAFAR, H GAMMEL, PL HUSE, DA MAJUMDAR, SN SCHNEEMEYER, LF BISHOP, DJ NIEVA, G DELACRUZ, F AF LOPEZ, D SAFAR, H GAMMEL, PL HUSE, DA MAJUMDAR, SN SCHNEEMEYER, LF BISHOP, DJ NIEVA, G DELACRUZ, F TI LOCAL VERSUS NONLOCAL CONDUCTIVITY IN YBA2CU3O7-DELTA - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Note C1 LOS ALAMOS NATL LAB,CTR SUPERCOND TECHNOL,LOS ALAMOS,NM 87545. AT&T BELL LABS,MURRAY HILL,NJ 07974. YALE UNIV,DEPT PHYS,NEW HAVEN,CT 06520. RP LOPEZ, D (reprint author), CTR ATOM BARILOCHE,RA-8400 BARILOCHE,RIO NEGRO,ARGENTINA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 18 PY 1995 VL 75 IS 12 BP 2447 EP 2447 DI 10.1103/PhysRevLett.75.2447 PG 1 WC Physics, Multidisciplinary SC Physics GA RU811 UT WOS:A1995RU81100051 ER PT J AU WOLF, D WANG, J PHILLPOT, SR GLEITER, H AF WOLF, D WANG, J PHILLPOT, SR GLEITER, H TI ON THE THERMODYNAMIC RELATIONSHIP BETWEEN NANOCRYSTALLINE MATERIALS AND GLASSES SO PHYSICS LETTERS A LA English DT Article ID METALS AB Atomistic computer simulations are used to expose important parallels that exist in the dynamical properties of nanocrystalline materials and glasses. Both types of heavily disordered, metastable microstructures exhibit low- and high-frequency lattice-vibrational modes not seen in the perfect crystal, giving rise to similar thermodynamic properties at low temperatures, most notably a pronounced anomaly in their specific heats and a phase transition from the nanocrystalline state to the glass below a critical grain size. The possibility of a reversible, free-energy based transition between the two phases indicates that the two share a common configuration phase space below a certain critical grain size (of the order of 1.4 nm for the system studied in this paper). This result implies the existence of interesting kinetically-induced structural phenomena. C1 FORSCHUNGSZENTRUM KARLSRUHE,D-76021 KARLSRUHE,GERMANY. RP WOLF, D (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Phillpot, Simon/J-9117-2012; OI Phillpot, Simon/0000-0002-7774-6535 NR 18 TC 23 Z9 23 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD SEP 18 PY 1995 VL 205 IS 4 BP 274 EP 280 DI 10.1016/0375-9601(95)00545-E PG 7 WC Physics, Multidisciplinary SC Physics GA RV824 UT WOS:A1995RV82400005 ER PT J AU HOBERG, JO BOZELL, JJ AF HOBERG, JO BOZELL, JJ TI CYCLOPROPANATION AND RING-EXPANSION OF UNSATURATED SUGARS SO TETRAHEDRON LETTERS LA English DT Article ID ALLYLIC ALCOHOLS; ISOLAUREPINNACIN; ETHERS AB The cyclopropanation of unsaturated sugars provides 1,2 C-methylene carbohydrates in good to excellent yields. Treatment of the cyclopropanes with a Lewis acid furnishes seven-membered oxacycles. RP HOBERG, JO (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 43 TC 53 Z9 53 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0040-4039 J9 TETRAHEDRON LETT JI Tetrahedron Lett. PD SEP 18 PY 1995 VL 36 IS 38 BP 6831 EP 6834 DI 10.1016/0040-4039(95)01387-W PG 4 WC Chemistry, Organic SC Chemistry GA RV684 UT WOS:A1995RV68400009 ER PT J AU GEISER, U SCHLUETER, JA DUDEK, JD WILLIAMS, JM NAUMANN, D ROY, T AF GEISER, U SCHLUETER, JA DUDEK, JD WILLIAMS, JM NAUMANN, D ROY, T TI NONSUPERCONDUCTING PHASE OF BIS(3,4-3',4'-ETHYLENEDITHIO)-2,2',5,5'-TETRATHIAFULVALENE-TETRAKIS(TRIF LUOROMETHYL)ARGENTATE(III) (2/1), (BEDT-TTF)(2)[AG(CF3)(4)] SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article AB The semiconductive phase in the system BEDT-TTF:[Ag(CF3)(4)](-), where BEDT-TTF is 3,4;3',4'-bis(ethylenedithio)-2,2',5,5'-tetrathiafulvalene {alternative IUPAC name: 5,5',6,6'-tetrahydro-2,2'-bi(1,3-dithiolo-[4,5-b][1,4]dithiinylidene), C10H8S8} contains theta-packing motif type layers of the electron-donor molecules. The anion has a planar AgC4 core and its trifluoromethyl groups are crystallographically ordered. C1 ARGONNE NATL LAB,DIV SCI MAT,ARGONNE,IL 60439. UNIV COLOGNE,INST ANORGAN CHEM,D-50939 COLOGNE,GERMANY. RP GEISER, U (reprint author), ARGONNE NATL LAB,DIV CHEM,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 9 TC 7 Z9 7 U1 1 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD SEP 15 PY 1995 VL 51 BP 1779 EP 1782 DI 10.1107/S0108270195003064 PN 9 PG 4 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA RY790 UT WOS:A1995RY79000028 ER PT J AU PAL, A STOKES, DL ALARIE, JP VO-DINH, T AF PAL, A STOKES, DL ALARIE, JP VO-DINH, T TI SELECTIVE SURFACE-ENHANCED RAMAN-SPECTROSCOPY USING A POLYMER-CAOATED SUBSTRATE SO ANALYTICAL CHEMISTRY LA English DT Article ID SILVER ELECTRODE; SCATTERING SERS; SPECTROMETRY; SPECTRA; PARTICLES; COPPER AB The polymer, poly(vinylpyrrolidone), is investigated as a potential coating for alumina-based surface-enhanced Raman scattering (SERS) substrates. Description for dip-coating alumina substrates with a 5% (w/v) methanolic solution of the polymer is included, Using these polymer-coated substrates, various compounds, including monocyclic aromatic compounds with hydroxyl, carboxyl, and various nitrogen-based functional groups, are detected. Intensity of SERS signals from the polymer-coated substrates in comparison to that of SERS signals from uncoated substrates is demonstrated to be a function of the analyte permeability to the polymer coating. Different enhancement factors are reported for various compounds, such as benzoic acid, isonicotinic acid, and 2,4-dinitrophenol, thus indicating some enhancement selectivity of the polymer coating to various analytes. Using benzoic acid as a test compound, various coating procedures (horizontal and vertical dipping procedures) have been evaluated. The poly(vinylpyrrolidone)-coated substrate is shown to yield a relative standard deviation in SERS signal intensity of similar to 20%, The potential of the polymer-coated substrate as a selective detection probe is illustrated using the analyses of binary mixtures, Finally, the advantages of the polymer coating for protecting the SERS-active layer are also discussed. C1 OAK RIDGE NATL LAB, DIV HLTH SCI RES, ADV MONITORING DEV GRP, OAK RIDGE, TN 37831 USA. NR 29 TC 27 Z9 27 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 EI 1520-6882 J9 ANAL CHEM JI Anal. Chem. PD SEP 15 PY 1995 VL 67 IS 18 BP 3154 EP 3159 DI 10.1021/ac00114a009 PG 6 WC Chemistry, Analytical SC Chemistry GA RU331 UT WOS:A1995RU33100009 ER PT J AU CASTRO, A SHERA, EB AF CASTRO, A SHERA, EB TI SINGLE-MOLECULE ELECTROPHORESIS SO ANALYTICAL CHEMISTRY LA English DT Article ID POLYMERASE CHAIN-REACTION; DNA; ERRORS; DYES; PCR AB A novel method for the detection and identification of single molecules in solution has been devised, computer simulated, and experimentally achieved. The technique involves the determination of electrophoretic velocities by measuring the time required for individual molecules to travel a fixed distance between two laser beams. Computer simulations of the process were performed beforehand in order to estimate the experimental feasibility of the method and to determine the optimum values for the various experimental parameters. Examples of the use of the technique for the ultrasensitive detection and identification of rhodamine-6G, a mixture of DNA restriction fragments, and a mixture of proteins in aqueous solution are presented. RP LOS ALAMOS NATL LAB, BIOPHYS GRP, MAIL STOP D434, LOS ALAMOS, NM 87545 USA. NR 19 TC 76 Z9 76 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 EI 1520-6882 J9 ANAL CHEM JI Anal. Chem. PD SEP 15 PY 1995 VL 67 IS 18 BP 3181 EP 3186 DI 10.1021/ac00114a013 PG 6 WC Chemistry, Analytical SC Chemistry GA RU331 UT WOS:A1995RU33100013 ER PT J AU SCHNEIDER, TW MARTIN, SJ AF SCHNEIDER, TW MARTIN, SJ TI INFLUENCE OF COMPRESSIONAL WAVE GENERATION ON THICKNESS-SHEAR MODE RESONATOR RESPONSE IN A FLUID SO ANALYTICAL CHEMISTRY LA English DT Article ID QUARTZ CRYSTAL MICROBALANCE; LIQUID-PHASE; PIEZOELECTRIC-CRYSTALS; MASS; SENSORS; TRANSMISSION; DETECTORS; PROFILE AB Acoustic interferometry was performed with thickness-shear mode (TSM) resonators to investigate the effect of compressional wave generation on the response (resonant frequency and damping), Resonator response was measured while the spacing between the resonator and adjacent solid was filled with fluid and the spacing was varied. A characteristic resonance response was observed whenever the spacing reached a multiple of lambda(c)/2, where lambda(c) is the compressional wavelength in the fluid. Compressional wave generation arises from a gradient in the inplane surface displacement. A model is proposed to predict the resonator response that arises from combined shear wave and compressional wave generation. Experimental data fit to this model determine device coupling to shear and compressional waves. The model also relates resonator response to the surface displacement profile. By measuring this displacement profile, compressional wave generation can be estimated. The effect of surface roughness and device geometry on shear and compressional wave coupling is examined. The results indicate that even in a semiinfinite fluid, compressional wave generation contributes significantly to device damping (motional resistance) but not to the frequency shift. RP SCHNEIDER, TW (reprint author), SANDIA NATL LABS,DEPT MICROSENSOR RES & DEV,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 35 TC 95 Z9 97 U1 1 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD SEP 15 PY 1995 VL 67 IS 18 BP 3324 EP 3335 DI 10.1021/ac00114a032 PG 12 WC Chemistry, Analytical SC Chemistry GA RU331 UT WOS:A1995RU33100032 ER PT J AU FABRY, ME SENGUPTA, A SUZUKA, SM COSTANTINI, F RUBIN, EM HOFRICHTER, J CHRISTOPH, G MANCI, E CULBERSON, D FACTOR, SM NAGEL, RL AF FABRY, ME SENGUPTA, A SUZUKA, SM COSTANTINI, F RUBIN, EM HOFRICHTER, J CHRISTOPH, G MANCI, E CULBERSON, D FACTOR, SM NAGEL, RL TI A 2ND-GENERATION TRANSGENIC MOUSE MODEL EXPRESSING BOTH HEMOGLOBIN-S (HBS) AND HBS-ANTILLES RESULTS IN INCREASED PHENOTYPIC SEVERITY SO BLOOD LA English DT Article ID SICKLE-CELL DISEASE; HUMAN BETA-S; ALPHA-GLOBINS; RED-CELLS; POLYMERIZATION; MICE; TRANSPORT; HYPOXIA; INVIVO; CHAINS AB We report on a second generation of transgenic mice produced by crossing a transgenic mouse line expressing high levels of human alpha and beta(S) chains (alpha(H) beta(S)[beta(MDD)]) with a line expressing human alpha and beta(S-Antilles) (beta(SAnt)). We hypothesized that mice expressing both hemoglobins (Hbs) would have a more severe phenotype because the reduced oxygen affinity and solubility of the beta(S-Antilles) might enhance the rate and extent of polymer formation. We obtained mice that expressed both beta(S) and beta(S-Antilles). Th, doubly transgenic mice that are heterozygous for deletion of mouse beta(Major) (beta(MD)) occurred with reduced frequency and those that are homozygous for deletion of mouse beta(Major) (beta(MDD)) occurred at a much reduced frequency and suffered early mortality. Human alpha was 58% of all alpha globin for all animals, whereas beta(S) and beta(S-Antilles) were 34% and 28% of all beta globins for beta(MD) mice and 42% and 36% for beta(MDD) mice. Hematocrit, Hb, and mean corpuscular Hb were normal for all transgenic mice, but reticulocyte levels were higher for the doubly transgenic mice versus (alpha(H) beta(S)[beta(MDD)] mice older than 30 days (10.0% +/- 1.0% v 4.3% +/- 0.4%; P < .001, mean +/- SE, n = 20 and n = 10, respectively) and control mice (3.9% +/- 0.4%). Reticulocytosis was more severe in mice less than 30 days old (>20% for alpha(H) beta(S) beta(S-Ant)[beta(MDD)] mice). The median mean corpuscular hemoglobin concentration of doubly transgenic mice was higher than that of alpha(H) beta(S)[beta(MDD)] mice with a variable number of very dense cells. Delay times for polymerization of Hb in red blood cells from alpha(H) beta(S) beta(S-Ant)[beta(MDD)] mice were shorter than those of alpha(H) beta(S)[beta(MDD)] mice, and there were fewer cells with delay times greater than 100 seconds. Urine-concentrating ability in control mice under ambient conditions is 2,846 +/- 294 mOsm and was reduced 30% to 1,958 +/- 240 mOsm, P < 4 x 10(-8) in all mice expressing both transgenes. We conclude that doubly transgenic mice have a more severe phenotype than either of the two parental lines. These mice may be suitable for validating therapeutic intervention in sickle cell disease. (C) 1995 by The American Society of Hematology. C1 YESHIVA UNIV ALBERT EINSTEIN COLL MED,DEPT PATHOL,BRONX,NY 10461. COLUMBIA UNIV,DEPT GENET & DEV,NEW YORK,NY. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720. NIH,PHYS CHEM LAB,BETHESDA,MD. UNIV SO ALABAMA,CENTRALIZED PATHOL UNIT SICKLE CELL DIS,MOBILE,AL. RP FABRY, ME (reprint author), YESHIVA UNIV ALBERT EINSTEIN COLL MED,DEPT MED,ULLMANN 921,1300 MORRIS PK AVE,BRONX,NY 10461, USA. FU NHLBI NIH HHS [HL-38655] NR 30 TC 68 Z9 68 U1 0 U2 1 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD SEP 15 PY 1995 VL 86 IS 6 BP 2419 EP 2428 PG 10 WC Hematology SC Hematology GA RU052 UT WOS:A1995RU05200044 PM 7662990 ER PT J AU KANAAR, R LEE, AL RUDNER, DZ WEMMER, DE RIO, DC AF KANAAR, R LEE, AL RUDNER, DZ WEMMER, DE RIO, DC TI INTERACTION OF THE SEX-LETHAL RNA-BINDING DOMAINS WITH RNA SO EMBO JOURNAL LA English DT Article DE HETERONUCLEAR NMR; POLYPYRIMIDINE TRACT; PROTEIN-RNA INTERACTION; RIBONUCLEOPROTEIN; SEX-LETHAL ID SMALL NUCLEAR RIBONUCLEOPROTEIN; SPLICING FACTOR U2AF; HNRNP-C-PROTEINS; CRYSTAL-STRUCTURE; PREMESSENGER RNA; TRANSFORMER GENE; DNA-BINDING; NMR-SPECTRA; N-15 NMR; DROSOPHILA AB Sex determination and X chromosome dosage compensation in Drosophila melanogaster are directed by the Sex-lethal (Sxl) protein, In part, Sxl functions by regulating the splicing of the transformer pre-mRNA by binding to a 3' splice site polypyrimidine tract. Polypyrimidine tracts are essential for splicing of metazoan pre-mRNAs. To unravel the mechanism of splicing regulation at polypyrimidine tracts we analyzed the interaction of Sxl with RNA. The RNA binding activity of Sxl was mapped to the two ribonucleoprotein consensus sequence domains of the protein. Quantitation of binding showed that both RNA binding domains (RBDs) were required in cis for site-specific RNA binding. Individual RBDs interacted with RNA more weakly and had lost the ability to discriminate between wild-type and mutant transformer polypyrimidine tracts. Structural elements in one of the RBDs that are likely to interact with a polypyrimidine tract were identified using nuclear magnetic resonance techniques. In addition, our data suggest that multiple imino protons of the transformer polypyrimidine tract were involved in hydrogen bonding. Interestingly, in vitro Sxl bound with equal affinity to polypyrimidine tracts of pre-mRNAs that it does not regulate in vivo. We discuss the implications of this finding for the mechanism through which Sxl may gain selectivity for particular polypyrimidine tracts in vivo. C1 UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,DIV BIOCHEM & MOLEC BIOL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. FU NICHD NIH HHS [HD28063] NR 57 TC 73 Z9 73 U1 0 U2 1 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0261-4189 J9 EMBO J JI Embo J. PD SEP 15 PY 1995 VL 14 IS 18 BP 4530 EP 4539 PG 10 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA RX441 UT WOS:A1995RX44100016 PM 7556096 ER PT J AU LYDON, JP DEMAYO, FJ FUNK, CR MANI, SK HUGHES, AR MONTGOMERY, CA SHYAMALA, G CONNEELY, OM OMALLEY, BW AF LYDON, JP DEMAYO, FJ FUNK, CR MANI, SK HUGHES, AR MONTGOMERY, CA SHYAMALA, G CONNEELY, OM OMALLEY, BW TI MICE LACKING PROGESTERONE-RECEPTOR EXHIBIT PLEIOTROPIC REPRODUCTIVE ABNORMALITIES SO GENES & DEVELOPMENT LA English DT Article DE PROGESTERONE RECEPTOR; HOMOLOGOUS RECOMBINATION; REPRODUCTION; MAMMARY GLAND; SEXUAL BEHAVIOR; PLEIOTROPIC COORDINATOR ID MOUSE ESTROGEN-RECEPTOR; IMMATURE RAT; MOLECULAR-CLONING; HORMONE RECEPTORS; MAMMARY-GLANDS; CELL-DIVISION; GENE; INTERLEUKIN-8; ACTIVATION; DISRUPTION AB Although progesterone has been recognized as essential for the establishment and maintenance of pregnancy, this steroid hormone has been recently implicated to have a functional role in a number of other reproductive events. The physiological effects of progesterone are mediated by the progesterone receptor (PR), a member of the nuclear receptor superfamily of transcription factors. In most cases the PR is induced by estrogen, implying that many of the in vivo effects attributed to progesterone could also be the result of concomitantly administered estrogen. Therefore, to clearly define those physiological events that are specifically attributable to progesterone in vivo, we have generated a mouse model carrying a null mutation of the PR gene using embryonic stem cell/gene targeting techniques. Male and female embryos homozygous for the PR mutation developed normally to adulthood. However, the adult female PR mutant displayed significant defects in all reproductive tissues. These included an inability to ovulate, uterine hyperplasia and inflammation, severely limited mammary gland development, and an inability to exhibit sexual behavior. Collectively, these results provide direct support for progesterone's role as a pleiotropic coordinator of diverse reproductive events that together ensure species survival. C1 BAYLOR COLL MED,DEPT CELL BIOL,HOUSTON,TX 77030. BAYLOR COLL MED,CTR COMPARAT MED,HOUSTON,TX 77030. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720. FU NICHD NIH HHS [HD-07857] NR 65 TC 1136 Z9 1162 U1 5 U2 31 PU COLD SPRING HARBOR LAB PRESS PI PLAINVIEW PA 1 BUNGTOWN RD, PLAINVIEW, NY 11724 SN 0890-9369 J9 GENE DEV JI Genes Dev. PD SEP 15 PY 1995 VL 9 IS 18 BP 2266 EP 2278 DI 10.1101/gad.9.18.2266 PG 13 WC Cell Biology; Developmental Biology; Genetics & Heredity SC Cell Biology; Developmental Biology; Genetics & Heredity GA RW877 UT WOS:A1995RW87700006 PM 7557380 ER PT J AU JACOBSON, AR CARLOS, RC MASSEY, RS WU, GH HOOGEVEEN, G AF JACOBSON, AR CARLOS, RC MASSEY, RS WU, GH HOOGEVEEN, G TI TOTAL-ELECTRON-CONTENT SIGNATURES OF PLASMASPHERIC MOTIONS SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article AB Measurements of fluctuations in total electron content made with a radio interferometer reveal weak but frequent outbursts of total-electron-content disturbances, with trace azimuths roughly westward, with trace speeds up to similar to 2 km/s, and with temporal periods in the range 100 - 500 seconds. Statistical tests of the dataset suggest that these disturbances are due to drift of plasmaspheric irregularities past the radio lines-of-sight. The phenomenon is likely to provide a new passive tracer of zonal convection in the inner magnetosphere. RP JACOBSON, AR (reprint author), LOS ALAMOS NATL LAB,SPACE & ATMOSPHER SCI GRP,MAIL STOP D466,LOS ALAMOS,NM 84545, USA. NR 11 TC 6 Z9 6 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD SEP 15 PY 1995 VL 22 IS 18 BP 2461 EP 2464 DI 10.1029/95GL02550 PG 4 WC Geosciences, Multidisciplinary SC Geology GA RW251 UT WOS:A1995RW25100006 ER PT J AU COX, SJ WANG, WC SCHWARTZ, SE AF COX, SJ WANG, WC SCHWARTZ, SE TI CLIMATE RESPONSE TO RADIATIVE FORCINGS BY SULFATE AEROSOLS AND GREENHOUSE GASES SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID EFFECTIVE CO2; ACTIVE GASES; INADEQUACY; PROXY AB The annual, global mean radiative forcing for the troposphere-surface system has been used to rank the global warming influences of atmospheric trace gases. The approach was also used recently to compare the cooling influence of tropospheric sulfate aerosols with the warming influence of greenhouse gases. However, the spatial inhomogeneity of sulfate aerosols (concentrated mainly in the continental Northern Hemisphere) may induce climate responses which differ other than just in sign from those induced by increased concentrations of the more homogeneously distributed greenhouse gases. Here we use a general circulation model to further examine the suitability of global mean radiative forcing as a predictor of differences in global, hemispheric, and regional climate responses to differing spatial and temporal forcing patterns. The calculated responses indicate that changes of the global and annual mean surface air temperature depend only on global average net forcing and are not highly sensitive either to the details of the spatial and seasonal patterns in forcing or to the nature of the forcing (shortwave vs. longwave). Thus in global and annual mean the negative aerosol forcing may be viewed as a scaleable anti-greenhouse forcing. However substantial responses to nonuniformly distributed aerosol forcing were observed at hemispheric and regional scales. Further, the patterns of response differ from the patterns of forcing, leading to the conclusion that the spatial distribution of all significant forcings must be accurately represented when studying regional climate changes. C1 BROOKHAVEN NATL LAB,DIV ENVIRONM CHEM,UPTON,NY 11973. RP COX, SJ (reprint author), SUNY ALBANY,ATMOSPHER SCI RES CTR,ALBANY,NY 12205, USA. RI Schwartz, Stephen/C-2729-2008 OI Schwartz, Stephen/0000-0001-6288-310X NR 15 TC 35 Z9 35 U1 0 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD SEP 15 PY 1995 VL 22 IS 18 BP 2509 EP 2512 DI 10.1029/95GL02477 PG 4 WC Geosciences, Multidisciplinary SC Geology GA RW251 UT WOS:A1995RW25100018 ER PT J AU BROWN, SR STOCKMAN, HW REEVES, SJ AF BROWN, SR STOCKMAN, HW REEVES, SJ TI APPLICABILITY OF THE REYNOLDS-EQUATION FOR MODELING FLUID-FLOW BETWEEN ROUGH SURFACES SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID ROCK JOINTS AB Predictions of the Reynolds equation for flow between rough-walled surfaces have been compared to a more exact calculation of Navier-Stokes flow based on a lattice-gas automaton method. Two-dimensional channels were constructed with an idealized sinusoidal roughness on each wall. Flow in the channels was studied by both methods for various amplitude to wavelength ratios of the roughness, surface separations, relative alignment or phase of the sinusoids, and Reynolds numbers. The Reynolds equation overestimates fluid velocity as the surfaces are placed together or the amplitude of the roughness increases relative to its wavelength. C1 SANDIA NATL LABS,DEPT GEOCHEM,ALBUQUERQUE,NM 87185. RP BROWN, SR (reprint author), SANDIA NATL LABS,DEPT GEOMECH,MS-0751,ALBUQUERQUE,NM 87185, USA. NR 13 TC 76 Z9 79 U1 1 U2 10 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD SEP 15 PY 1995 VL 22 IS 18 BP 2537 EP 2540 DI 10.1029/95GL02666 PG 4 WC Geosciences, Multidisciplinary SC Geology GA RW251 UT WOS:A1995RW25100025 ER PT J AU PALCZEWSKA, M JASINSKI, J KORONA, K KAMINSKA, M BOURRET, ED ELLIOT, AG AF PALCZEWSKA, M JASINSKI, J KORONA, K KAMINSKA, M BOURRET, ED ELLIOT, AG TI ANTISITE DEFECTS CREATED IN NEUTRON-IRRADIATED GAP CRYSTALS SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB This article compares the nature of phosphorus antisite defects in as-grown and neutron irradiated GaP crystals. Electron spin resonance studies indicate that these defects in both kinds of crystals have identical close neighbors consisting of four phosphorus atoms. Neutron irradiation of GaP introduced an additional defect (called WA1), which is linked to a gallium antisite. Characteristic absorption bands and conductivity of neutron irradiated CaP crystals are discussed as well. (C) 1995 American Institute of Physics. C1 UNIV WARSAW,INST EXPTL PHYS,PL-00681 WARSAW,POLAND. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. HEWLETT PACKARD CORP,SAN JOSE,CA 95131. RP PALCZEWSKA, M (reprint author), INST ELECTR MAT TECHNOL,WOLCZYNSKA 133,PL-01919 WARSAW,POLAND. NR 14 TC 7 Z9 8 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 15 PY 1995 VL 78 IS 6 BP 3680 EP 3685 DI 10.1063/1.359945 PG 6 WC Physics, Applied SC Physics GA RU953 UT WOS:A1995RU95300017 ER PT J AU YOUNG, DA COREY, EM AF YOUNG, DA COREY, EM TI A NEW GLOBAL EQUATION OF STATE MODEL FOR HOT, DENSE MATTER SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SHOCK COMPRESSIBILITY; HIGH-PRESSURE; ALUMINUM; GPA; DEUTERIUM; GBAR; MO; PB AB The Thomas-Fermi-based quotidian equation of state model has been modified to include new options: (1) solid-solid phase transitions; (2) arbitrary Gruneisen gamma function input; (3) soft-sphere model for the critical point and liquid-vapor region; and (4) diatomic molecular dissociation. The new model is fitted to experimental shock Hugoniot, isothermal, and critical point data to illustrate its flexibility. The limitations of the Thomas-Fenni model and the possibility of further physics improvements in global equation of state models are discussed. RP LAWRENCE LIVERMORE NATL LAB, POB 808, LIVERMORE, CA 94551 USA. NR 52 TC 80 Z9 81 U1 0 U2 10 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 15 PY 1995 VL 78 IS 6 BP 3748 EP 3755 DI 10.1063/1.359955 PG 8 WC Physics, Applied SC Physics GA RU953 UT WOS:A1995RU95300028 ER PT J AU VILL, MA REK, ZU YALISOVE, SM BILELLO, JC AF VILL, MA REK, ZU YALISOVE, SM BILELLO, JC TI GROWTH TEXTURES OF THICK SPUTTERED FILMS AND MULTILAYERS ASSESSED VIA SYNCHROTRON TRANSMISSION LAUE SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB The growth textures of thick sputtered Mo metallizations and Mo/W multilayers, were characterized via a synchrotron white-beam (WB) x-ray transmission Laue technique, Transmission x-ray diffraction studies of Mo specimens up to 61 mu m thick were performed with WB synchrotron radiation; while the practical thickness limit for similar observations using a conventional laboratory Cu K(alpha) x-ray source is ten times smaller. This unique approach used polychromatic x rays to simultaneously produce diffraction from a wide spread of orientations of many crystallographic planes for all the grains within a relatively large specimen volume (similar to 60 X 10(6) mu m(3)). These patterns were obtained for polycrystalline 31- and 61-mu m-thick Mo/W multilayer specimens, and a 35-mu m-thick-monolithic Mo foil specimen. In all three cases the alignment of specimen grains was similar to what would be expected for single-crystal transmission patterns, except that the recorded intensity distributed was less localized. The WB transmission images were indexed using a reciprocal space construction for the Laue case. In the multilayers, the grains were oriented out-of-plane such that [110] crystallographic planes were aligned in the direction of sputter growth, while in the monolithic Mo specimen [111] crystallographic planes were so aligned, i.e., perpendicular to the deposition substrate. A spread in orientation of similar to 5 degrees was measured in the multilayer specimens, while the monolithic Mo specimen showed a spread of similar to 30 degrees when compared to a perfect single-crystal orientation. Preferred orientation was also observed within the plane of growth to varying degrees for all three samples. (C) 1995 American Institute of Physics. C1 STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94305. RP VILL, MA (reprint author), UNIV MICHIGAN,DEPT MAT SCI & ENGN,ANN ARBOR,MI 48109, USA. NR 18 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 15 PY 1995 VL 78 IS 6 BP 3812 EP 3819 DI 10.1063/1.360746 PG 8 WC Physics, Applied SC Physics GA RU953 UT WOS:A1995RU95300037 ER PT J AU WEI, SH ZUNGER, A AF WEI, SH ZUNGER, A TI BAND OFFSETS AND OPTICAL BOWINGS OF CHALCOPYRITES AND ZN-BASED II-VI ALLOYS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SPECIAL-QUASIRANDOM-STRUCTURES; ENERGY GAP VALUES; ZNSXSE1-X MIXED-CRYSTALS; ELECTRONIC-STRUCTURE; SEMICONDUCTOR ALLOYS; PHASE-DIAGRAM; COMPOSITION DEPENDENCE; RANDOM AL0.5GA0.5AS; SOLID-SOLUTIONS; GROUND-STATE AB Using first-principles band-structure theory we have systematically calculated the (i) alloy bowing coefficients, (ii) alloy mixing enthalpies, and (iii) interfacial valence- and conduction-band offsets for three mixed-anion (CuInX(2), X = S, Se, Te) and three mixed-cation (CuMSe(2), M = Al, Ga, In) chalcopyrite systems. The random chalcopyrite alloys are represented by special quasirandom structures (SQS). The calculated bowing coefficients are in good agreement with the most recent experimental data for stoichiometric alloys. Results for the mixing enthalpies acid the band offsets are provided as predictions to be tested experimentally. Comparing our calculated bowing and band offsets for the mixed-anion chalcopyrite alloys with those of the corresponding Zn chalcogenide alloys (ZnX, X = S, Se, Te), we find that the larger p-d coupling in chalcopyrite alloys reduces their band offsets and optical bowing. Bowing parameters for ordered, Zn-based II-VI alloys in the CuAu, CuPt, and chalcopyrite structures are presented: we find that ordered Zn2SeTe has bowing coefficients of 1.44 and 3.15 eV in the CuAu and CuPt structures, while the random ZnSexTe1-x alloy has a bowing of 1.14 eV. The band alignment between CuInSe2 and CuInSe2-derived ordered vacancy compounds are also presented. (C) 1995 American Institute of Physics. RP NATL RENEWABLE ENERGY LAB, GOLDEN, CO 80401 USA. RI Zunger, Alex/A-6733-2013 NR 93 TC 284 Z9 290 U1 4 U2 69 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 15 PY 1995 VL 78 IS 6 BP 3846 EP 3856 DI 10.1063/1.359901 PG 11 WC Physics, Applied SC Physics GA RU953 UT WOS:A1995RU95300043 ER PT J AU DAVIDS, PS SAXENA, A SMITH, DL AF DAVIDS, PS SAXENA, A SMITH, DL TI NONDEGENERATE CONTINUUM MODEL FOR POLYMER LIGHT-EMITTING-DIODES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CONDUCTING POLYMERS; EFFICIENCY AB We present a device model to describe polymer light-emitting diodes (PLEDs) under bias conditions for which strong electrical injection does not occur (i.e., reverse, zero, and weak forward bias). The model is useful to interpret: capacitance-voltage measurements, which probe the charged trap density in the PLEDs; electroabsorption measurements on PLEDs, which probe the built-in electric field in the device; and internal photoemission measurements, which probe the effective Schottky barriers at the contacts of the PLED. The device model is based on the low-density nondegenerate continuum model for the electronic structure of polymers. Polarons and bipolarons are the principal charged excitations in this model. Polarons are singly charged excitations which play the primary role in charge injection and in experiments such as internal photoemission which probe single particle interface properties. Bipolarons are doubly charged excitations which can play an important role in establishing Schottky barriers at metal/polymer interfaces, In the device model, the region of the polymer near each contact is assumed to be in quasiequilibrium with that contact. The charge density as a function of position is found from the electrostatic potential and equilibrium statistics. Poisson's equation is integrated to determine the electrostatic potential. We find that a large charge density is transferred into the polymer if the chemical potential of a contact is higher than the negative bipolaron formation energy per particle or lower than the positive bipolaron formation energy per particle. The transferred charge pins the Fermi level and establishes the effective Schottky barrier. If the contact chemical potential is between the formation energy per particle of the two types of charged bipolarons, there is little charge transfer into the polymer and the Fermi level is not pinned. The electric field in the device is found for different contacts and bias conditions, Capacitance as a function of voltage is calculated for various trap binding energies and densities. The calculated results are used to interpret recent measurements on PLEDs. (C) 1995 American Institute of Physics. RP DAVIDS, PS (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Davids, Paul/D-1550-2010 NR 17 TC 58 Z9 58 U1 0 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 15 PY 1995 VL 78 IS 6 BP 4244 EP 4252 DI 10.1063/1.359886 PG 9 WC Physics, Applied SC Physics GA RU953 UT WOS:A1995RU95300101 ER PT J AU UNER, DO PRUSKI, M KING, TS AF UNER, DO PRUSKI, M KING, TS TI OPTIMIZATION OF THE VOLUMETRIC HYDROGEN CHEMISORPTION TECHNIQUE FOR DISPERSIONS OF RU/SIO2 CATALYSTS SO JOURNAL OF CATALYSIS LA English DT Article ID SPILLOVER AB Metal dispersions of silica-supported ruthenium catalysts determined by the standard volumetric chemisorption technique were found to be inaccurate due to irreversible spillover of hydrogen to the support. Direct evidence was obtained via in situ H-1 NMR for an irreversibly bound component of the hydrogen that migrated from the metal to the support on a time scale of tens of minutes or longer at room temperature. It was also shown in this work that hydrogen saturated the surface of the metal particles on a shorter time scale, on the order of minutes. Based on H-1 NMR, optimum conditions for the volumetric chemisorption method were determined in order to alleviate the interference of spillover with measurements of hydrogen uptake on the metal. Ruthenium dispersions obtained from the optimized volumetric chemisorption technique were more accurate and agreed well with the results of the H-1 NMR method. (C) 1995 Academic Press, Inc. C1 IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. RP IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM ENGN, AMES, IA 50011 USA. RI Uner, Deniz/P-5819-2015 OI Uner, Deniz/0000-0001-8585-3691 NR 12 TC 44 Z9 44 U1 1 U2 7 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0021-9517 EI 1090-2694 J9 J CATAL JI J. Catal. PD SEP 15 PY 1995 VL 156 IS 1 BP 60 EP 64 DI 10.1006/jcat.1995.1231 PG 5 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA RV567 UT WOS:A1995RV56700007 ER PT J AU SAULT, AG AF SAULT, AG TI REDUCTION BEHAVIOR OF METALS SUPPORTED ON HYDROUS TITANIUM-OXIDE ION-EXCHANGE MATERIALS SO JOURNAL OF CATALYSIS LA English DT Article ID TEMPERATURE-PROGRAMMED REDUCTION; RAY PHOTOELECTRON-SPECTROSCOPY; IRON SYNTHESIS CATALYSTS; REACTIVITY; TIO2(110); FILMS; GROWTH AB Hydrous titanium oxide (HTO) ion-exchange materials provide a unique and versatile platform for obtaining high loadings of supported transition metal cations with essentially atomic dispersion. Strong interactions between the atomically dispersed metal cations and the support alter the reduction behavior of metal cations as compared to other support materials and preparation methods. X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), and secondary ion mass spectrometry (SIMS) measurements of the reduction of Ph, Ni, and Fe supported on HTO materials provide a representative cross section of possible behaviors. The results suggest that metals with high melting points and low surface mobility, such as Ph, Pt, and Pd, should retain high dispersions even after reduction at temperatures up to 300 degrees C. Lower melting point metals such as Ni, Co, and Cu, that exhibit moderate heats of oxide formation, will likely undergo extensive sintering at temperatures above 250 degrees C, largely negating the high dispersions characteristic of the freshly ion-exchanged state. Finally, lower melting point metals with very high heats of oxide formation, such as Fe and Cr, will be difficult to reduce due to unfavorable thermodynamics in the presence of the support. The results indicate that for certain types of metals, HTO support materials allow the preparation of catalysts with both high loadings and high metal dispersions. This capability provides a new pathway toward more efficient usage of expensive noble metals that is unavailable using conventional catalyst supports and preparation methods. (C) 1995 Academic Press, Inc. RP SAULT, AG (reprint author), SANDIA NATL LABS,DEPT FUEL SCI,MS 0710,ALBUQUERQUE,NM 87185, USA. NR 35 TC 8 Z9 8 U1 3 U2 8 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9517 J9 J CATAL JI J. Catal. PD SEP 15 PY 1995 VL 156 IS 1 BP 154 EP 162 DI 10.1006/jcat.1995.1241 PG 9 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA RV567 UT WOS:A1995RV56700017 ER PT J AU WOON, DE DUNNING, TH AF WOON, DE DUNNING, TH TI GAUSSIAN-BASIS SETS FOR USE IN CORRELATED MOLECULAR CALCULATIONS .5. CORE-VALENCE BASIS-SETS FOR BORON THROUGH NEON SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CONFIGURATION-INTERACTION CALCULATIONS; WAVE-FUNCTIONS; BENCHMARK CALCULATIONS; DIATOMIC HYDRIDES; ATOMS; ABINITIO AB The correlation-consistent polarized valence basis sets (cc-pVXZ) for the atoms boron through neon have been extended to treat core and core-valence correlation effects. Basis functions were added to the existing cc-pVXZ sets to form correlation-consistent polarized core-valence sets (cc-pCVXZ) in the usual pattern: Double zeta added (1s1p), triple zeta added (2s2p1d), quadruple zeta added (3s3p2d1f), and quintuple zeta added (4s4p3d2f1g). The exponents of the core functions were determined by minimizing the difference between all-electron and valence-only correlation energies obtained from HF+1+2 calculations on the ground states of the atoms. With the cc-pCVXZ sets, core, core-valence, and valence correlation energies all converge exponentially toward apparent complete basis set (CBS) limits, as do the corresponding all-electron singles and doubles CI energies. Several test applications of the new sets are presented: The first two ionization potentials of boron, the P-3-S-5 separation in carbon, and the (X) over tilde(3)B(1)-(a) over tilde(1)A(1) state separation in CH2. As expected, correlation effects involving the core electrons of the first row atoms, B-Ne, are small but must be included if high accuracy is required. (C) 1995 American Institute of Physics. C1 PACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, RICHLAND, WA 99352 USA. NR 28 TC 1726 Z9 1729 U1 3 U2 74 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 15 PY 1995 VL 103 IS 11 BP 4572 EP 4585 DI 10.1063/1.470645 PG 14 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RU110 UT WOS:A1995RU11000020 ER PT J AU LI, YL PRETZLER, G NILSEN, J FILL, EE AF LI, YL PRETZLER, G NILSEN, J FILL, EE TI SPACE-RESOLVED INVESTIGATION OF LASING ON THE 2 J=0-1, 3P-3S TRANSITIONS AT 20.5 AND 25.5 NM IN NEON-LIKE IRON SO OPTICS COMMUNICATIONS LA English DT Note ID X-RAY LASER AB We report a spatially resolved investigation of lasing on the 3p(1)S(0)-3s(3)P(1) and 3p(1)S(0)-3s(1)P(1) transitions at 20.5 and 25.5 nm in neon-like iron. Using the Asterix IV iodine laser slab targets were irradiated at an intensity of 2.0 x 10(13) W cm(-2) with a prepulse 5.2 ns before the main pulse. With a 1.5% prepulse, the gain of the two lasers was measured to be 2.3 and 4.1 cm(-1) at their spatial maxima. The lasing on the 20.5 nm line was measured to occur slightly farther from the target surface than on the 25.5 nm line. The dependence of the lasing position on the prepulse energy was also investigated. Increasing the prepulse to 15% shifts the lasing position by 100 mu m farther away from the target. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. ACAD SINICA,SHANGHAI INST OPT & FINE MECH,SHANGHAI 201800,PEOPLES R CHINA. RP LI, YL (reprint author), MAX PLANCK INST QUANTUM OPT,HANS KOPFERMANN STR 1,D-85748 GARCHING,GERMANY. NR 22 TC 7 Z9 9 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD SEP 15 PY 1995 VL 119 IS 5-6 BP 557 EP 562 DI 10.1016/0030-4018(95)00369-J PG 6 WC Optics SC Optics GA RV949 UT WOS:A1995RV94900019 ER PT J AU HOLTOM, GR CROWELL, RA CHENG, LK AF HOLTOM, GR CROWELL, RA CHENG, LK TI FEMTOSECOND MIDINFRARED OPTICAL PARAMETRIC OSCILLATOR BASED ON CSTIOASO4 SO OPTICS LETTERS LA English DT Article ID TI-SAPPHIRE LASER AB A high-repetition-rate Ti:sapphire laser is used to synchronously pump a type-II angle-tuned CsTiOAsO4 (CTA) optical parametric oscillator. When pumped at 809 nm, the optical parametric oscillator is tunable from 1.007 to 1.180 mu m in the signal branch and hom 2.590 to 4.120 mu m in the idler branch. Powers as high as 235 mW are obtained in the signal branch. Pulse widths as short as 56 fs are generated at 1.115 mu m. CTA is shown to have a unique combination of low walk-off and low dispersion that contributes to its high gain and conversion efficiency. (C) 1995 Optical Society of America C1 DUPONT CO INC, SCI & ENGN LAB, WILMINGTON, DE 19880 USA. RP HOLTOM, GR (reprint author), PACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, MAIL STOP K2-14, POB 999, RICHLAND, WA 99352 USA. NR 11 TC 11 Z9 13 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD SEP 15 PY 1995 VL 20 IS 18 BP 1880 EP 1882 DI 10.1364/OL.20.001880 PG 3 WC Optics SC Optics GA RU367 UT WOS:A1995RU36700016 PM 19862189 ER PT J AU CELLIERS, P WEBER, F DASILVA, LB BARBEE, TW CAUBLE, R WAN, AS MORENO, JC AF CELLIERS, P WEBER, F DASILVA, LB BARBEE, TW CAUBLE, R WAN, AS MORENO, JC TI FRINGE FORMATION AND COHERENCE OF A SOFT-X-RAY LASER-BEAM ILLUMINATING A MACH-ZEHNDER INTERFEROMETER SO OPTICS LETTERS LA English DT Article AB We investigated the fringe visibility produced by a Mach-Zehnder interferometer illuminated by a collisionally pumped yttrium x-ray laser operating at 15.5 nm. Fringe visibility varied as a function both of relative path delay and of relative spatial overlap of the beams. This visibility information was extracted quantitatively from several interferograms and analyzed to produce a characterization of the temporal coherence, yielding a gain-narrowed linewidth of 1.3 pm for the 15.5-nm laser transition and spatial coherence consistent with an effective source size of approximate to 220 mu m +/- 50% at the x-ray laser output. (C) Optical Society of America RP CELLIERS, P (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 13 TC 34 Z9 34 U1 1 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD SEP 15 PY 1995 VL 20 IS 18 BP 1907 EP 1909 DI 10.1364/OL.20.001907 PG 3 WC Optics SC Optics GA RU367 UT WOS:A1995RU36700025 PM 19862198 ER PT J AU HONG, S MAHAN, GD AF HONG, S MAHAN, GD TI TEMPERATURE-DEPENDENCE OF THE HARTREE-FOCK APPROXIMATION IN 2 DIMENSIONS SO PHYSICAL REVIEW B LA English DT Note AB The Hartree-Fock (HF) exchange energy of the two-dimensional electron gas is calculated at nonzero temperatures. The calculation is done self-consistently in that the HF self-energy is included self-consistently in the Fermi-Dirac functions. We also calculate the first and second derivatives of the exchange energy with respect to density, which are useful for density-functional calculations at nonzero temperatures. These calculations may be useful in understanding the temperature dependence of two-dimensional systems such as electrons trapped two dimensionally in semiconductor interfaces. C1 UNIV PENN, DEPT PHYS, PHILADELPHIA, PA 19104 USA. UNIV TENNESSEE, DEPT PHYS & ASTRON, KNOXVILLE, TN 37996 USA. RP OAK RIDGE NATL LAB, DIV SOLID STATE, POB 2008, OAK RIDGE, TN 37831 USA. NR 14 TC 5 Z9 5 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1995 VL 52 IS 11 BP 7860 EP 7863 DI 10.1103/PhysRevB.52.7860 PG 4 WC Physics, Condensed Matter SC Physics GA RV818 UT WOS:A1995RV81800025 ER PT J AU PETALAS, J LOGOTHETIDIS, S BOULTADAKIS, S ALOUANI, M WILLS, JM AF PETALAS, J LOGOTHETIDIS, S BOULTADAKIS, S ALOUANI, M WILLS, JM TI OPTICAL AND ELECTRONIC-STRUCTURE STUDY OF CUBIC AND HEXAGONAL GAN THIN-FILMS SO PHYSICAL REVIEW B LA English DT Article ID MOLECULAR-BEAM EPITAXY; TEMPERATURE-DEPENDENCE; BAND-STRUCTURE; WURTZITE; GAAS; SEMICONDUCTORS; LUMINESCENCE; DIAMOND; GROWTH AB The optical properties of cubic and hexagonal GaN films in the region of the fundamental gap are studied with spectroscopic ellipsometry at temperatures between 110 and 630 K. It is verified that the gap of hexagonal GaN is higher than that of the cubic polytype. The parameters of the gaps are determined against temperature and the temperature shifts are found to be lower than and close to those of GaAs and GaP in the cases of cubic and hexagonal GaN, respectively. Additional theoretical calculations of the electronic structure of both polytypes using the full-potential linear-muffin-tin-orbital method reveal a significant contribution to the E(0) gap from the 8 --> 10 transitions. The resulting gap energies are compared with the Literature and the difference between the two GaN polytypes is discussed. The dielectric function epsilon(2) (omega) is directly calculated from the band structure and its features at energies up to 9.5 eV are discussed and compared to experiment. C1 OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP PETALAS, J (reprint author), ARISTOTELIAN UNIV THESSALONIKI,DEPT PHYS,GR-54006 THESSALONIKI,GREECE. RI Alouani, Mebarek/A-9101-2011 OI Alouani, Mebarek/0000-0002-7985-5276 NR 39 TC 92 Z9 93 U1 1 U2 9 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1995 VL 52 IS 11 BP 8082 EP 8091 DI 10.1103/PhysRevB.52.8082 PG 10 WC Physics, Condensed Matter SC Physics GA RV818 UT WOS:A1995RV81800058 ER PT J AU HUNN, JD WITHROW, SP WHITE, CW HEMBREE, DM AF HUNN, JD WITHROW, SP WHITE, CW HEMBREE, DM TI RAMAN-SCATTERING FROM MEV-ION IMPLANTED DIAMOND SO PHYSICAL REVIEW B LA English DT Article ID AMORPHOUS-CARBON; GRAPHITE AB Single-crystal diamond has been irradiated with 4-MeV carbon ions to doses in the range (0.5-130)X10(16) ions/cm(2). With increasing implantation damage, the triply degenerate one-phonon Raman mode at 1332 cm(-1) broadens and shifts down to around 1300 cm(-1). This corresponds to a broad peak in the one-phonon density of states predicted for Raman scattering from an amorphous sp(3) carbon network. Additional Raman peaks appear at 1451, 1498, and 1634 cm(-1). These do not correspond to any previously observed peaks in carbon materials and may be unique to implantation above 1 MeV. These three peaks, together with the Raman scattering below 1300 cm(-1), correspond well with the density of states of an amorphous carbon network of mostly fourfold bonded carbon with some localized threefold bonding. C1 OAK RIDGE PLANT Y12,OAK RIDGE,TN 37831. RP HUNN, JD (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 19 TC 53 Z9 53 U1 1 U2 11 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1995 VL 52 IS 11 BP 8106 EP 8111 DI 10.1103/PhysRevB.52.8106 PG 6 WC Physics, Condensed Matter SC Physics GA RV818 UT WOS:A1995RV81800060 ER PT J AU YANG, XZ ISHIO, H BURGDORFER, J AF YANG, XZ ISHIO, H BURGDORFER, J TI STATISTICS OF MAGNETOCONDUCTANCE IN BALLISTIC CAVITIES SO PHYSICAL REVIEW B LA English DT Article ID CONDUCTANCE FLUCTUATIONS; QUANTUM TRANSPORT; OPEN BILLIARDS; SCATTERING; CHAOS; DOTS AB The statistical properties of magnetoconductance in ballistic microcavities are investigated numerically. The distribution of conductance for chaotic cavities is found to, follow the renormalized Porter-Thomas distribution suggested by random-matrix theory for the Gaussian ensemble while the conductance distribution of regular cavities in magnetic fields is nonuniversal and shifted towards the maximum value for a given number of open channels. The renormalized Porter-Thomas distribution implies a universal dependence of fluctuation amplitude on the mean conductance for chaotic cavities in the absence of time-reversal symmetry. The fluctuation amplitude for regular cavities is found to be larger than the saturation value of the fluctuation amplitude of chaotic cavities predicted by random-matrix theory. The change of the mean conductance as a function of the external magnetic field is consistent with semiclassical predictions. C1 KYOTO UNIV,DEPT PHYS,KYOTO 606,JAPAN. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP YANG, XZ (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 31 TC 19 Z9 19 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1995 VL 52 IS 11 BP 8219 EP 8225 DI 10.1103/PhysRevB.52.8219 PG 7 WC Physics, Condensed Matter SC Physics GA RV818 UT WOS:A1995RV81800072 ER PT J AU GLUTSCH, S CHEMLA, DS AF GLUTSCH, S CHEMLA, DS TI SEMICONDUCTOR BLOCH EQUATIONS IN A HOMOGENEOUS MAGNETIC-FIELD SO PHYSICAL REVIEW B LA English DT Article AB We present a rigorous derivation of the semiconductor Bloch equations (SBE) in a uniform magnetic field. The equation of motion for the density matrix is derived, including Coulomb interaction. We show that both in real space and momentum space the center of mass and relative coordinate motions separate exactly to all orders. Generalizations of the convolution and of the Fourier transform can be defined which allows us to establish the SBE in complete analogy to the field-free case. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. RP GLUTSCH, S (reprint author), UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. NR 25 TC 17 Z9 17 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1995 VL 52 IS 11 BP 8317 EP 8322 DI 10.1103/PhysRevB.52.8317 PG 6 WC Physics, Condensed Matter SC Physics GA RV818 UT WOS:A1995RV81800085 ER PT J AU BENEDICT, LX LOUIE, SG COHEN, ML AF BENEDICT, LX LOUIE, SG COHEN, ML TI STATIC POLARIZABILITIES OF SINGLE-WALL CARBON NANOTUBES SO PHYSICAL REVIEW B LA English DT Article ID DENSITY-FUNCTIONAL APPROACH; DIELECTRIC MATRICES; TUBULES; MICROTUBULES; EXCITATIONS; C-60 AB The static electric polarizability tenser of single-wall carbon nanotubes is calculated within the random-phase approximation using a simple tight-binding model and a classical correction to include local fields. We find that the polarizability for constant fields parallel to the cylindrical axis is highly dependent on the details of the tube's electronic structure. In contrast, the polarizability for fields perpendicular to the axis only depends on the tube radius. The relative magnitudes of these two quantities suggests that under the application of a randomly oriented electric field, nanotubes acquire dipole moments pointing mainly along their axes, with the size of the dipole inversely proportional to the square of the minimum direct band gap. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. RP BENEDICT, LX (reprint author), UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. NR 25 TC 384 Z9 387 U1 5 U2 32 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1995 VL 52 IS 11 BP 8541 EP 8549 DI 10.1103/PhysRevB.52.8541 PG 9 WC Physics, Condensed Matter SC Physics GA RV818 UT WOS:A1995RV81800111 ER PT J AU KRESS, JD VOTER, AF AF KRESS, JD VOTER, AF TI LOW-ORDER MOMENT EXPANSIONS TO TIGHT-BINDING FOR INTERATOMIC POTENTIALS - SUCCESSES AND FAILURES SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE CALCULATIONS; LOCAL ATOMIC ENVIRONMENT; MAXIMUM-ENTROPY APPROACH; BOND ORDER; MOLECULAR-DYNAMICS; TRANSITION-METALS; RECURSION METHOD; DENSITY-MATRIX; SYSTEMS; SILICON AB We discuss the use of moment-based approximations to tight binding. Using a maximum entropy form for the electronic density of states, we show that a general interatomic potential can be defined that is suitable for molecular-dynamics simulations and has several other desirable features. For covalent materials (C and Si), properties where the atoms are in equivalent environments are well converged at low-order moments. For defect environments, which offer a more critical (and relevant) test, the method is found to give less satisfactory results. For example, the vacancy formation energy for Si is too low by similar to 2 eV at 10 moments relative to exact tight binding. Attempts to improve the accuracy were unsuccessful, leading to the conclusion that potentials based on this approach are inadequate for covalent materials. We speculate that this may be a deficiency of low-order moment methods in general. For metals, in contrast to the covalent systems, we find that the low-order moment approach is better behaved. This finding is consistent with the success of existing empirical fourth-moment potentials for metals. RP KRESS, JD (reprint author), LOS ALAMOS NATL LAB,DIV THEORET T12 MSB268,POB 1663,LOS ALAMOS,NM 87545, USA. OI Voter, Arthur/0000-0001-9788-7194 NR 53 TC 12 Z9 12 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1995 VL 52 IS 12 BP 8766 EP 8775 DI 10.1103/PhysRevB.52.8766 PG 10 WC Physics, Condensed Matter SC Physics GA RZ008 UT WOS:A1995RZ00800040 ER PT J AU VANEK, J DEKKER, JP LODDER, A AF VANEK, J DEKKER, JP LODDER, A TI ELECTROMIGRATION OF SUBSTITUTIONAL IMPURITIES IN METALS - THEORY AND APPLICATION IN AL AND CU SO PHYSICAL REVIEW B LA English DT Article ID INTERSTITIAL GREEN-FUNCTIONS; TRANSITION-METALS; RESIDUAL RESISTIVITY; DILUTE ALLOYS; SCATTERING; NIOBIUM; AG; NB; PD AB A theory describing scattering of Bloch electrons by an atom halfway along its path towards a neighboring vacancy is cast in a computationally convenient form. This allows for the computation of the electromigration wind force at the saddle-point position in an elementary diffusion step, where the cross section for Bloch electron-impurity scattering of the migrating ion is at a maximum. Results for atoms migrating into a neighboring vacancy in Al and Cu are presented. The outcome is found to be consistent with experimental information, even though only a two-atom cluster was embedded in the host metal. It is concluded that even more realistic calculations of the electromigration wind force on substitutional impurities in metals are possible upon incorporation of the effects of local lattice deformation and charge transfer. C1 LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94551. VRIJE UNIV AMSTERDAM,FAC NAT & STERRENKUNDE,1081 HV AMSTERDAM,NETHERLANDS. NR 22 TC 13 Z9 13 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1995 VL 52 IS 12 BP 8794 EP 8800 DI 10.1103/PhysRevB.52.8794 PG 7 WC Physics, Condensed Matter SC Physics GA RZ008 UT WOS:A1995RZ00800043 ER PT J AU WOLVERTON, C ZUNGER, A AF WOLVERTON, C ZUNGER, A TI FIRST-PRINCIPLES THEORY OF SHORT-RANGE ORDER, ELECTRONIC EXCITATIONS AND SPIN POLARIZATION IN NI-V AND PD-V ALLOYS SO PHYSICAL REVIEW B LA English DT Article ID PHASE-STABILITY; COMPOSITIONAL ORDER; DIFFUSE-SCATTERING; NEUTRON-SCATTERING; ATOMIC INTERACTION; METALLIC ALLOYS; SPECIAL POINTS; MONTE-CARLO; ORIGINS; SYSTEMS AB The short-range order (SRO) and long-range order (LRO) of Ni-V and Pd-V alloys are studied theoretically by a combination of first-principles calculations of Ising-like interaction energies (J(f)) with a Monte Carlo solution of the Ising Hamiltonian. We find the following: (i) There are several compositions in these alloys for which the dominant wave vectors of LRO and those of SRO do not coincide, indicating that the low-temperature (T) LRO may not always be inferred from the high-T SRO. (ii) In Ni3V and Pd3V, the density of states at the Fermi level, n(epsilon(F)), is much larger in L1(2) than in the stable D0(22) structure. This has two consequences: (a) thermal electron-hole excitations across epsilon(F) are energetically more favorable in the L1(2) structure and lead to a T dependence of J(f), and (b) magnetic stabilization is larger in L1(2), so spin polarization affects structural stability. As a result, (iii) calculations using T-dependent J(f)'s are needed to obtain quantitative agreement with experimental measurements of LRO, SRO, and transition temperatures in Ni0.75V0.25, Ni0.67V0.33, and Pd0.75V0.25. (iv) We provide predictions of the SRO patterns where there is currently no experimental evidence for Pd0.67V0.33, Ni0.6V0.4, Pd0.6V0.4, and Pd0.5V0.5. (v) For Ni3V and Pd3V, discrepancies are found between the total-energy differences of the L1(2) and D0(22) structures as determined by T=0 first-principles calculations and those inferred from diffuse neutron scattering measurements at high T. By performing temperature-dependent self-consistent local-density-approximation calculations, we find that electronic excitations are responsible for reducing the discrepancy by similar to 25% and the combination of spin polarization and electronic excitations reduce the discrepancy by similar to 30-50%. Thus, electronic excitations and spin polarization are not fully responsible for the T dependence of J(f) used in the SRO calculations. RP NATL RENEWABLE ENERGY LAB, GOLDEN, CO 80401 USA. RI Wolverton, Christopher/B-7542-2009; Zunger, Alex/A-6733-2013 NR 53 TC 54 Z9 54 U1 0 U2 12 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1995 VL 52 IS 12 BP 8813 EP 8828 DI 10.1103/PhysRevB.52.8813 PG 16 WC Physics, Condensed Matter SC Physics GA RZ008 UT WOS:A1995RZ00800046 ER PT J AU HILDNER, ML DALEY, RS FELTER, TE ESTRUP, PJ AF HILDNER, ML DALEY, RS FELTER, TE ESTRUP, PJ TI ATOMIC DISPLACEMENTS OF MO(100) SURFACE PHASES MEASURED BY ION-SCATTERING SO PHYSICAL REVIEW B LA English DT Article ID W(001) SURFACE; CHEMISORPTION SYSTEM; CRITICAL-DYNAMICS; MO(001) SURFACE; RECONSTRUCTION; TRANSITION; H/MO(100); MECHANISM; W(100) AB High-energy ion scattering has been used to study the clean Mo(100) reconstruction and the modifications caused by hydrogen adsorption. The results indicate that at room temperature the clean surface is disordered and that the atomic displacements are comparable to those at low temperature. The experiments also show that the surface-atom displacements at any fixed coverage in the hydrogen phases are approximately independent of temperature between 10 and 300 K. C1 SANDIA NATL LABS,LIVERMORE,CA 94550. RP HILDNER, ML (reprint author), BROWN UNIV,DEPT PHYS,PROVIDENCE,RI 02912, USA. NR 33 TC 3 Z9 3 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1995 VL 52 IS 12 BP 9050 EP 9060 DI 10.1103/PhysRevB.52.9050 PG 11 WC Physics, Condensed Matter SC Physics GA RZ008 UT WOS:A1995RZ00800069 ER PT J AU BALATSKY, AV MATVEENKO, SI AF BALATSKY, AV MATVEENKO, SI TI DYNAMICAL PROPERTIES OF QUANTUM HALL EDGE STATES SO PHYSICAL REVIEW B LA English DT Note AB We consider the dynamical properties of simple edge states in integer (nu=1) and fractional (nu=1/2m+1) quantum Hall (QH) liquids. The influence of a time-dependent local perturbation on the ground state is investigated. It is shown that the orthogonality catastrophe occurs for the initial and final state overlap \[i\f]\similar to L(-(1/2 nu)(delta/pi)2) with the phase shift delta. The transition probability for the x-ray problem is also found with the index, dependent on nu. Optical experiments that measure the x-ray response of the QH edge are discussed. We also consider electrons tunneling from a one-dimensional Fermi liquid into a QH fluid. For any filling fraction the tunneling from a Fermi liquid to the QH edge is suppressed at low temperatures and we find the nonlinear I-V characteristics I similar to V-1/nu. C1 LD LANDAU THEORET PHYS INST,MOSCOW 117940,RUSSIA. RP BALATSKY, AV (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 12 TC 3 Z9 3 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1995 VL 52 IS 12 BP R8676 EP R8679 PG 4 WC Physics, Condensed Matter SC Physics GA RZ008 UT WOS:A1995RZ00800025 ER PT J AU FUNSTEN, HO AF FUNSTEN, HO TI FORMATION AND SURVIVAL OF H- AND C- IONS TRANSITING ULTRATHIN CARBON FOILS AT KEV ENERGIES SO PHYSICAL REVIEW B LA English DT Note ID METAL-SURFACES; ELECTRON-GAS; CESIATED TUNGSTEN; CHARGE-EXCHANGE; STOPPING POWER; HYDROGEN; SCATTERING; ALUMINUM; COLLISIONS; IMPURITIES AB The fraction of negatively charged projectiles existing in a bulk foil and their neutralization at a foil's exit surface are characterized using exit charge-state distribution data for 1-30-keV/amu H and C that transit 1.1-mu g cm(-2) carbon foils. The equilibrium fraction of negative ions in the bulk foil is derived and is observed to decrease exponentially with increasing projectile velocity. RP FUNSTEN, HO (reprint author), LOS ALAMOS NATL LAB, MAIL STOP D466, LOS ALAMOS, NM 87545 USA. RI Funsten, Herbert/A-5702-2015 OI Funsten, Herbert/0000-0002-6817-1039 NR 43 TC 7 Z9 7 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1995 VL 52 IS 12 BP R8703 EP R8706 PG 4 WC Physics, Condensed Matter SC Physics GA RZ008 UT WOS:A1995RZ00800032 ER PT J AU HONE, J FUHRER, MS KHAZENI, K ZETTL, A AF HONE, J FUHRER, MS KHAZENI, K ZETTL, A TI ELECTRICAL-TRANSPORT MEASUREMENTS OF KC60 SO PHYSICAL REVIEW B LA English DT Note ID FULLERENE AB We have measured the temperature-dependent electrical resistivity rho of polymerized KC60 from 410 to 1.9 K. rho(T) shows evidence for a metal-to-semiconductor phase transition near 50 K, and increases dramatically above 400 K. Between 400 and 50 K, rho is metal-like, decreasing smoothly with decreasing temperature. Under applied hydrostatic pressure, rho decreases, and the 50-K transition is suppressed. No anomalous magnetoresistance is observed up to 7 T, and we find no evidence of superconductivity above 1.9 K. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP HONE, J (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Fuhrer, Michael/E-7634-2010; Hone, James/E-1879-2011; Zettl, Alex/O-4925-2016 OI Fuhrer, Michael/0000-0001-6183-2773; Hone, James/0000-0002-8084-3301; Zettl, Alex/0000-0001-6330-136X NR 16 TC 24 Z9 24 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1995 VL 52 IS 12 BP R8700 EP R8702 PG 3 WC Physics, Condensed Matter SC Physics GA RZ008 UT WOS:A1995RZ00800031 ER PT J AU LIU, Y XU, Z JOHNSON, PD VANDERLAAN, G AF LIU, Y XU, Z JOHNSON, PD VANDERLAAN, G TI SPIN-ORBIT-COUPLING, EXCHANGE INTERACTION, AND HYBRIDIZATION IN THE PHOTOEXCITATION OF THE NI 3P CORE-LEVEL SO PHYSICAL REVIEW B LA English DT Note ID MAGNETIC CIRCULAR-DICHROISM; X-RAY DICHROISM; ABSORPTION-SPECTROSCOPY; POLARIZATION ANALYZER; FERROMAGNETIC NICKEL; PHOTOEMISSION; 2P AB A spin-polarized photoemission study of the Ni 3p core level reveals the spin polarization of the main line and the satellites. A detailed comparison with calculation confirms earlier assignments that the satellites have d(9) character. However, the measurement also reveals the role of spin-orbit and exchange interactions in determining the spin polarization of the main peak, which is shown to be composed of both d(9) and d(10) character. The study shows that the spin polarization in the leading edge of the main line reflects its d(9) character as a result of the hybridization between the different configurations. C1 SERC,DARESBURY LAB,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND. RP LIU, Y (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI van der Laan, Gerrit/Q-1662-2015 OI van der Laan, Gerrit/0000-0001-6852-2495 NR 27 TC 19 Z9 19 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1995 VL 52 IS 12 BP R8593 EP R8596 PG 4 WC Physics, Condensed Matter SC Physics GA RZ008 UT WOS:A1995RZ00800003 ER PT J AU MEN, FK SMITH, AR CHAO, KJ ZHANG, ZY SHIH, CK AF MEN, FK SMITH, AR CHAO, KJ ZHANG, ZY SHIH, CK TI DIMER-VACANCY-DIMER-VACANCY INTERACTION ON THE SI(001) SURFACE - THE NATURE OF THE 2XN STRUCTURE SO PHYSICAL REVIEW B LA English DT Note ID SCANNING-TUNNELING-MICROSCOPY; SI(100); STEPS; TEMPERATURE; DIFFRACTION; TRANSITION; DISORDER; SI(111) AB An increase of dimer vacancies on the Si(001)-2X1 surface after radiation quenching from high temperatures has been observed using STM. After further quenches, vacancies nucleate into chains running perpendicular to the dimer rows. These vacancy chains then connect and develop into vacancy lines (VL's) that extend for many thousands of Angstrom. Each VL consists of mainly two types of dimer vacancies: a divacancy and the combination of a single vacancy and a divacancy separated by an isolated dimer. All the VL's together with the dimer rows form a 2Xn structure with 6 less than or equal to n less than or equal to 12. Calculations using the Stillinger-Weber potential have been performed to examine the ordering mechanism of dimer vacancies. C1 UNIV WISCONSIN,DEPT MAT SCI & ENGN,MADISON,WI 53706. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP MEN, FK (reprint author), UNIV TEXAS,DEPT PHYS,AUSTIN,TX 78712, USA. NR 28 TC 45 Z9 45 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1995 VL 52 IS 12 BP R8650 EP R8653 PG 4 WC Physics, Condensed Matter SC Physics GA RZ008 UT WOS:A1995RZ00800018 ER PT J AU SINKOVIC, B SHEKEL, E HULBERT, SL AF SINKOVIC, B SHEKEL, E HULBERT, SL TI SPIN-RESOLVED IRON SURFACE-DENSITY OF STATES SO PHYSICAL REVIEW B LA English DT Note ID POLARIZED ELECTRON-SCATTERING; RAY PHOTOELECTRON-SPECTROSCOPY; AUGER-SPECTROSCOPY; MAGNETISM; FE; FE(110); FERROMAGNETS; EXCITATIONS; TRANSITION; SOLIDS AB The spin polarization of photoemitted valence-band electrons from polycrystalline Fe films shows good qualitative agreement with the calculated spin-resolved density of states (SRDOS) of bcc Fe. The quantitative differences are accounted for by the surface contribution to the photoelectron intensity. Simple subtraction of calculated bulk Fe SRDOS from the photoemission spectra yield an experimental surface SRDOS that agrees well with the calculation for Fe(001) and Fe(110). The Fe surface spin polarization is enhanced by (12+/-8)% over the bulk, consistent with theoretical predictions. C1 BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP SINKOVIC, B (reprint author), NYU,DEPT PHYS,2 WASHINGTON PL,NEW YORK,NY 10003, USA. NR 41 TC 16 Z9 16 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1995 VL 52 IS 12 BP R8696 EP R8699 PG 4 WC Physics, Condensed Matter SC Physics GA RZ008 UT WOS:A1995RZ00800030 ER PT J AU STALLINGA, P WALUKIEWICZ, W WEBER, ER BECLA, P LAGOWSKI, J AF STALLINGA, P WALUKIEWICZ, W WEBER, ER BECLA, P LAGOWSKI, J TI ELECTRON-PARAMAGNETIC-RESONANCE STUDY OF SE-DOPED ALSB - EVIDENCE FOR NEGATIVE-U OF THE DX-CENTER SO PHYSICAL REVIEW B LA English DT Note ID PERSISTENT PHOTOCONDUCTIVITY; LATTICE-RELAXATION; SEMICONDUCTORS AB A metastable electron-paramagnetic-resonance (EPR) signal is observed in Se-doped AlSb. When cooled in the dark, the sample is nonparamagnetic. After illumination with white light from a tungsten source a strong, persistent EPR signal with an isotropic g factor of 1.949 is observed. The metastability of the signal is consistent with earlier work done on DX-like centers. The absence of any EPR when cooled in the dark is direct evidence for the negative-U model. The EPR arises from the effective-mass state of the defect, which is not filled at thermal equilibrium. A detailed analysis of the line shape reveals that the linewidth is determined by hyperfine interactions. The extent of the wave function is found to be comparable to the predicted value of the effective-mass state. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. MIT,DEPT MAT SCI,CAMBRIDGE,MA 02139. UNIV S FLORIDA,CTR MICROELECTR RES,TAMPA,FL 33620. RP STALLINGA, P (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720, USA. NR 15 TC 5 Z9 5 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1995 VL 52 IS 12 BP R8609 EP R8612 PG 4 WC Physics, Condensed Matter SC Physics GA RZ008 UT WOS:A1995RZ00800007 ER PT J AU STEBBINS, A CALDWELL, RR AF STEBBINS, A CALDWELL, RR TI NO VERY LARGE-SCALE STRUCTURE IN AN OPEN UNIVERSE SO PHYSICAL REVIEW D LA English DT Article AB We study the effects of negative spatial curvature on the statistics of inhomogeneities in open cosmological models. In particular we examine the suppression of large-separation correlations in density and gravitational potential fluctuations and the resulting suppression of large-angle correlations in the anisotropy of the microwave background radiation. We obtain an expression which gives the minimum amount of suppression of correlations for any statistical distribution described by a ''power spectrum.'' This minimum suppression requires that the correlations fall off exponentially above the curvature scale. To the extent that the observed correlations in the temperature anisotropy extend to large angular scales, one can set a lower bound to the radius of curvature and hence on Omega(0). A preliminary analysis suggests that this bound is, in practice, extremely weak, and less stringent than other cosmological tests of curvature. C1 UNIV CAMBRIDGE,DEPT APPL MATH & THEORET PHYS,CAMBRIDGE CB3 9EW,ENGLAND. RP STEBBINS, A (reprint author), FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,MS 209,POB 500,BATAVIA,IL 60510, USA. OI Caldwell, Robert/0000-0001-7490-7463 NR 18 TC 9 Z9 9 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD SEP 15 PY 1995 VL 52 IS 6 BP 3248 EP 3264 DI 10.1103/PhysRevD.52.3248 PG 17 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA RV636 UT WOS:A1995RV63600010 ER PT J AU KOGAN, II KOVNER, A AF KOGAN, II KOVNER, A TI VARIATIONAL APPROACH TO THE QCD WAVE FUNCTIONAL - DYNAMICAL MASS GENERATION AND CONFINEMENT SO PHYSICAL REVIEW D LA English DT Article ID PHASE-TRANSITION; GROUND-STATE; LIGHT QUARKS AB We perform a variational calculation in the SU(N) Yang-Mills theory in 3 + 1 dimensions. Our trial variational states are explicitly gauge invariant, and reduce to simple Gaussian states in the sere coupling limit. Our main result is that the energy is minimized for the value of the variational parameter away from the perturbative value. The best variational state is therefore characterised by a dynamically generated mass scale M. This scale is related to the perturbative scale Lambda(QCD) by the relation alpha(QCD)(M) = (pi/4N). Taking the one-loop QCD beta function and Lambda(QCD) = 150 MeV we find (for N = 3) the vacuum condensate (alpha/pi)[F-2] = 0.008 GeV4. C1 PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544. LOS ALAMOS NATL LAB,DIV THEORY,LOS ALAMOS,NM 87545. NR 30 TC 54 Z9 54 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD SEP 15 PY 1995 VL 52 IS 6 BP 3719 EP 3734 DI 10.1103/PhysRevD.52.3719 PG 16 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA RV636 UT WOS:A1995RV63600051 ER PT J AU FU, CL ZOU, J YOO, MH AF FU, CL ZOU, J YOO, MH TI ELASTIC-CONSTANTS AND PLANAR FAULT ENERGIES OF TI3AL, AND INTERFACIAL ENERGIES AT THE TI3AL/TIAL INTERFACE BY FIRST-PRINCIPLES CALCULATIONS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID FRACTURE RP FU, CL (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 13 TC 38 Z9 39 U1 0 U2 12 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD SEP 15 PY 1995 VL 33 IS 6 BP 885 EP 891 DI 10.1016/0956-716X(95)00313-K PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA RR228 UT WOS:A1995RR22800006 ER PT J AU DOGAN, ON HAWK, JA AF DOGAN, ON HAWK, JA TI ABRASION RESISTANCE OF IN-SITU FE-TIC COMPOSITES SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article RP DOGAN, ON (reprint author), US BUR MINES,ALBANY RES CTR,ALBANY,OR 97321, USA. NR 15 TC 27 Z9 28 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD SEP 15 PY 1995 VL 33 IS 6 BP 953 EP 958 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA RR228 UT WOS:A1995RR22800017 ER PT J AU UNAL, O ECKEL, AJ LAABS, FC AF UNAL, O ECKEL, AJ LAABS, FC TI THE 1400-DEGREES-C-OXIDATION EFFECT ON MICROSTRUCTURE, STRENGTH AND CYCLIC LIFE OF SIC/SIC COMPOSITES SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article C1 AMES LAB,DIV MET & CERAM,AMES,IA 50010. NASA,LEWIS RES CTR,DIV MAT,CLEVELAND,OH 44135. NR 10 TC 2 Z9 2 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD SEP 15 PY 1995 VL 33 IS 6 BP 983 EP 988 DI 10.1016/0956-716X(95)00309-J PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA RR228 UT WOS:A1995RR22800021 ER PT J AU NIU, HS LUAN, S PANG, HM HOUK, RS AF NIU, HS LUAN, S PANG, HM HOUK, RS TI LANGMUIR PROBE MEASUREMENTS OF THE ION EXTRACTION PROCESS IN INDUCTIVELY-COUPLED PLASMA-MASS SPECTROMETRY .2. MEASUREMENTS OF FLOATING VOLTAGE AND RADIOFREQUENCY VOLTAGE SO SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY LA English DT Article DE ICP-MS; LANGMUIR PROBE ID ATOMIC EMISSION-SPECTROMETRY; ICP-MS; POTENTIAL MEASUREMENTS; ELECTRON-TEMPERATURE; SAMPLING PROCESS; PRESSURE PLASMA; INTERFACE AB A single Langmuir probe is thrust axially through the skimmer into. the supersonic jet of a typical interface for inductively coupled plasma-mass spectrometry (ICP-MS). Floating voltage V-f is measured from current-voltage curves at various axial positions and is generally in the range +2 to +7 V in the supersonic jet. A disturbance at the skimmer, when present, induces a sharp increase in V,in the vicinity of the skimmer tip. Floating voltage generally decreases as the probe is retracted farther behind the skimmer. The measured d.c. voltages are attributed primarily to plasma rectification and to the calorelectric effect between two metal surfaces at different temperatures in a plasma. An r.f. voltage of up to 25 V (peak-to-peak) at the frequency of the plasma generator can also be measured behind the sampler. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,DEPT CHEM,AMES,IA 50011. NR 56 TC 8 Z9 9 U1 2 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0584-8547 J9 SPECTROCHIM ACTA B JI Spectroc. Acta Pt. B-Atom. Spectr. PD SEP 15 PY 1995 VL 50 IS 10 BP 1247 EP 1261 DI 10.1016/0584-8547(95)01331-8 PG 15 WC Spectroscopy SC Spectroscopy GA TG593 UT WOS:A1995TG59300008 ER PT J AU GEORGIADIS, MM JESSEN, SM OGATA, CM TELESNITSKY, A GOFF, SP HENDRICKSON, WA AF GEORGIADIS, MM JESSEN, SM OGATA, CM TELESNITSKY, A GOFF, SP HENDRICKSON, WA TI MECHANISTIC IMPLICATIONS FROM THE STRUCTURE OF A CATALYTIC FRAGMENT OF MOLONEY MURINE LEUKEMIA-VIRUS REVERSE-TRANSCRIPTASE SO STRUCTURE LA English DT Article DE HIV-1; METAL ION SITE; MOLONEY MURINE LEUKEMIA VIRUS (MMLV); POLYMERASE; REVERSE TRANSCRIPTASE ID DEPENDENT DNA POLYMERASE; RNA-BINDING DOMAIN; CRYSTAL-STRUCTURE; ESCHERICHIA-COLI; ANGSTROM RESOLUTION; PROTEINS; TYPE-1; RECOGNITION; MUTAGENESIS; REFINEMENT AB Background: Reverse transcriptase (RT) converts the single-stranded RNA genome of a retrovirus into a double-stranded DNA copy for integration into the host genome. This process requires ribonuclease H as well as RNA- and DNA-directed DNA polymerase activities. Although the overall organization of HIV-1 RT is known from previously reported crystal structures, no structure of a complex including a metal ion, which is essential for its catalytic activity, has been reported. Results: Here we describe the structures at 1.8 Angstrom resolution of a catalytically active fragment of RT from Moloney murine leukemia virus (MMLV) and at 2.6 Angstrom of a complex of this fragment with Mn2+ coordinated in the polymerase active site. On the basis of similarities with HIV-1 RT and rat DNA polymerase beta, we have modeled template/primer and deoxyribonucleoside 5'-triphosphate substrates into the MMLV RT structure. Conclusions: Our model, in the context of the disposition of evolutionarily conserved residues seen here at high resolution, provides new insights into the mechanisms of catalysis, fidelity, processivity and discrimination between deoxyribose and ribose nucleotides. C1 RUTGERS STATE UNIV,DEPT CHEM,PISCATAWAY,NJ 08855. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE DEPT,HOWARD HUGHES MED INST BEAMLINE,UPTON,NY 11973. UNIV MICHIGAN,SCH MED,DEPT MICROBIOL & IMMUNOL,ANN ARBOR,MI 48109. COLUMBIA UNIV,HOWARD HUGHES MED INST,NEW YORK,NY 10032. COLUMBIA UNIV,DEPT BIOCHEM & MOLEC BIOPHYS,NEW YORK,NY 10032. RP GEORGIADIS, MM (reprint author), RUTGERS STATE UNIV,WAKSMAN INST,POB 759,PISCATAWAY,NJ 08855, USA. FU NCI NIH HHS [F32 CA09021-02]; NIGMS NIH HHS [GM-34102] NR 62 TC 124 Z9 127 U1 0 U2 4 PU CURRENT BIOLOGY LTD PI LONDON PA 34-42 CLEVELAND STREET, LONDON, ENGLAND W1P 6LB SN 0969-2126 J9 STRUCTURE JI Structure PD SEP 15 PY 1995 VL 3 IS 9 BP 879 EP 892 DI 10.1016/S0969-2126(01)00223-4 PG 14 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA RV348 UT WOS:A1995RV34800005 PM 8535782 ER PT J AU DONNET, DM KRISHNAN, KM YAJIMA, Y AF DONNET, DM KRISHNAN, KM YAJIMA, Y TI DOMAIN-STRUCTURES IN EPITAXIALLY GROWN COBALT THIN-FILMS SO JOURNAL OF PHYSICS D-APPLIED PHYSICS LA English DT Article ID MAGNETIZATION AB Following the epitaxial growth and characterization of single crystal c-axis oriented hcp cobalt thin films (with thicknesses in the range of 200-600 Angstrom), we have investigated their micromagnetic domain properties by Lorentz electron microscopy (LEM). in particular we have used the differential phase contrast mode of LEM because this imaging technique allows a wide range of quantitative analysis to be carried out directly. The domain structures were studied in the as-grown, ac-demagnetized and remanent states. Large domains with regular magnetization ripple and cross ties were observed in the thinner films, whilst stripe domains were seen in films with thicknesses greater than or equal to 400 Angstrom, Detailed analysis of the DPC images led to information pertaining to the domain wail width and its associated energy density being attained. C1 HITACHI LTD,CENT RES LAB,KOKUBUNJI,TOKYO 185,JAPAN. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV SCI MAT,BERKELEY,CA 94720. NR 27 TC 40 Z9 40 U1 0 U2 6 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0022-3727 J9 J PHYS D APPL PHYS JI J. Phys. D-Appl. Phys. PD SEP 14 PY 1995 VL 28 IS 9 BP 1942 EP 1950 DI 10.1088/0022-3727/28/9/023 PG 9 WC Physics, Applied SC Physics GA RW627 UT WOS:A1995RW62700023 ER PT J AU MULLER, RA MACDONALD, GJ AF MULLER, RA MACDONALD, GJ TI GLACIAL CYCLES AND ORBITAL INCLINATION SO NATURE LA English DT Letter C1 UNIV CALIF SAN DIEGO,INST GLOBAL CONFLICT & COOPERAT,LA JOLLA,CA 92093. RP MULLER, RA (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT PHYS,BERKELEY,CA 94720, USA. NR 7 TC 65 Z9 70 U1 2 U2 9 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD SEP 14 PY 1995 VL 377 IS 6545 BP 107 EP 108 DI 10.1038/377107b0 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA RU754 UT WOS:A1995RU75400030 ER PT J AU CHOPRA, NG BENEDICT, LX CRESPI, VH COHEN, ML LOUIE, SG ZETTL, A AF CHOPRA, NG BENEDICT, LX CRESPI, VH COHEN, ML LOUIE, SG ZETTL, A TI FULLY COLLAPSED CARBON NANOTUBES SO NATURE LA English DT Article ID ENERGETICS AB IT has been suggested(1) that the tensile strength of carbon nanotubes(2) might exceed that of other known fibres because of the inherent strength of the carbon-carbon bond. Calculations of the elastic properties of nanotubes confirm that they are extremely rigid in the axial direction and are most likely to distort perpendicular to the axis(3,4). Carbon nanotubes with localized kinks and bends(5,6), as well as minor radial deformations(7,8), have been observed. Here we report the existence of multi-shelled carbon nanotubes whose overall geometry differs radically from that of a straight, hollow cylinder. Our observations reveal nanotubes that have suffered complete collapse along their length. Theoretical modelling demonstrates that, for a given range of tube parameters, a completely collapsed nanotube is favoured energetically over the more familiar 'inflated' form with a circular cross-section. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP CHOPRA, NG (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Zettl, Alex/O-4925-2016; OI Zettl, Alex/0000-0001-6330-136X; Crespi, Vincent/0000-0003-3846-3193 NR 20 TC 336 Z9 339 U1 3 U2 63 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD SEP 14 PY 1995 VL 377 IS 6545 BP 135 EP 138 DI 10.1038/377135a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA RU754 UT WOS:A1995RU75400043 ER PT J AU ZAMFIR, NV HERING, G CASTEN, RF PAUL, P AF ZAMFIR, NV HERING, G CASTEN, RF PAUL, P TI HEXADECAPOLE DEFORMATIONS IN ACTINIDE AND TRANS-ACTINIDE NUCLEI SO PHYSICS LETTERS B LA English DT Article ID MOMENTS; TH-232; STATE AB It is shown that hexadecapole deformations can be estimated from B(E2; 2(1)(+) --> 0(1)(+)) values alone. Application of this method in the actinide nuclei gives semi-quantitative beta(4) values for Cf-250,Cf-252. A comparison with theoretical values provides general insight into the relative roles of shell gaps at Z = 114 and 126 which are important for the binding and stability of the heaviest nuclei. C1 CLARK UNIV,WORCESTER,MA 01610. INST ATOM PHYS,R-76900 BUCHAREST,ROMANIA. SUNY STONY BROOK,STONY BROOK,NY 11794. UNIV JENA,O-6900 JENA,GERMANY. RP ZAMFIR, NV (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Zamfir, Nicolae Victor/F-2544-2011 NR 22 TC 24 Z9 24 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD SEP 14 PY 1995 VL 357 IS 4 BP 515 EP 520 DI 10.1016/0370-2693(95)00978-T PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA RV825 UT WOS:A1995RV82500002 ER PT J AU NORMAN, EB SUR, B LESKO, KT LARIMER, RM DEPAOLO, DJ OWENS, TL AF NORMAN, EB SUR, B LESKO, KT LARIMER, RM DEPAOLO, DJ OWENS, TL TI AN IMPROVED TEST OF THE EXPONENTIAL DECAY LAW SO PHYSICS LETTERS B LA English DT Article ID EFFECTIVE PROTON LIFETIME; GOLDEN RULE; TIME SCALE; PARADOX AB We have compared the decay rate of freshly prepared K-40 to that of K-40 that is > 4.5 x 10(9) years old. We find that to within the experimental uncertainty of +/- 11%, the decay rates are the same. This indicates that the exponential nature of the decay law is valid down to time-scales of approximately 10(-10) t(1/2). C1 AUSTRALIAN NATL UNIV, RES SCH PHYS SCI & ENGN, DEPT PHYS NUCL, CANBERRA, ACT 0200, AUSTRALIA. UNIV CALIF BERKELEY, DEPT GEOL & GEOPHYS, CTR ISOTOPE GEOCHEM, BERKELEY, CA 94720 USA. RP UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV NUCL SCI, 1 CYCLOTRON RD, BERKELEY, CA 94720 USA. NR 30 TC 22 Z9 22 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD SEP 14 PY 1995 VL 357 IS 4 BP 521 EP 525 DI 10.1016/0370-2693(95)00818-6 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA RV825 UT WOS:A1995RV82500003 ER PT J AU FRABETTI, PL CHEUNG, HWK CUMALAT, JP DALLAPICCOLA, C GINKEL, JE GREENE, SV JOHNS, WE NEHRING, MS BUTLER, JN CIHANGIR, S GAINES, I GARBINCIUS, PH GARREN, L GOURLAY, SA HARDING, DJ KASPER, P KREYMER, A LEBRUN, P SHUKLA, S VITTONE, M BIANCO, S FABBRI, FL SARWAR, S ZALLO, A CULBERTSON, R GARDNER, RW GREENE, R WISS, J ALIMONTI, G BELLINI, G BOSCHINI, M BRAMBILLA, D CACCIANIGA, B CINQUINI, L DICORATO, M GIAMMARCHI, M INZANI, P LEVERARO, F MALVEZZI, S MENASCE, D MERONI, E MORONI, L PEDRINI, D PERASSO, L PRELZ, F SALA, A SALA, S TORRETTA, D BUCHHOLZ, D CLAES, D GOBBI, B OREILLY, B BISHOP, JM CASON, NM KENNEDY, CJ KIM, GN LIN, TF PUSELJIC, DL RUCHTI, RC SHEPHARD, WD SWIATEK, JA WU, ZY ARENA, V BOCA, G CASTOLDI, C GIANINI, G RATTI, SP RICCARDI, C VIOLA, L VITULO, P LOPEZ, A GRIM, GP PAOLONE, VS YAGER, PM WILSON, JR SHELDON, PD DAVENPORT, F BLACKETT, GR DANYO, K PISHARODY, M HANDLER, T CHEON, BG KANG, JS KIM, KY AF FRABETTI, PL CHEUNG, HWK CUMALAT, JP DALLAPICCOLA, C GINKEL, JE GREENE, SV JOHNS, WE NEHRING, MS BUTLER, JN CIHANGIR, S GAINES, I GARBINCIUS, PH GARREN, L GOURLAY, SA HARDING, DJ KASPER, P KREYMER, A LEBRUN, P SHUKLA, S VITTONE, M BIANCO, S FABBRI, FL SARWAR, S ZALLO, A CULBERTSON, R GARDNER, RW GREENE, R WISS, J ALIMONTI, G BELLINI, G BOSCHINI, M BRAMBILLA, D CACCIANIGA, B CINQUINI, L DICORATO, M GIAMMARCHI, M INZANI, P LEVERARO, F MALVEZZI, S MENASCE, D MERONI, E MORONI, L PEDRINI, D PERASSO, L PRELZ, F SALA, A SALA, S TORRETTA, D BUCHHOLZ, D CLAES, D GOBBI, B OREILLY, B BISHOP, JM CASON, NM KENNEDY, CJ KIM, GN LIN, TF PUSELJIC, DL RUCHTI, RC SHEPHARD, WD SWIATEK, JA WU, ZY ARENA, V BOCA, G CASTOLDI, C GIANINI, G RATTI, SP RICCARDI, C VIOLA, L VITULO, P LOPEZ, A GRIM, GP PAOLONE, VS YAGER, PM WILSON, JR SHELDON, PD DAVENPORT, F BLACKETT, GR DANYO, K PISHARODY, M HANDLER, T CHEON, BG KANG, JS KIM, KY TI FIRST MEASUREMENT OF THE LIFETIME OF THE OMEGA(0)(C) SO PHYSICS LETTERS B LA English DT Article ID LUND MONTE-CARLO; JET FRAGMENTATION; E+E-PHYSICS; LAMBDA-C+; VERSION AB We present the first measurement of the lifetime of the Omega(c)(0) baryon. The data were collected in the Fermilab high energy photoproduction experiment E687. The measured lifetime is tau = 86(-20)(+27)(stat.) +/- 28(syst.) fs. Thus the Omega(c)(0) has one of the shorter lifetimes among the weakly decaying singly charmed baryons. C1 IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. UNIV COLORADO,BOULDER,CO 80309. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. UNIV ILLINOIS,URBANA,IL 61801. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. NORTHWESTERN UNIV,EVANSTON,IL 60208. UNIV NOTRE DAME,NOTRE DAME,IN 46556. UNIV PAVIA,DIPARTIMENTO FIS NUCL & TEOR,I-27100 PAVIA,ITALY. IST NAZL FIS NUCL,I-27100 PAVIA,ITALY. UNIV PUERTO RICO,MAYAGUEZ,PR 00709. UNIV CALIF DAVIS,DAVIS,CA 95616. UNIV S CAROLINA,COLUMBIA,SC 29208. VANDERBILT UNIV,NASHVILLE,TN 37235. UNIV N CAROLINA,ASHEVILLE,NC 28804. UNIV TENNESSEE,KNOXVILLE,TN 37996. KOREA UNIV,SEOUL 136701,SOUTH KOREA. RP FRABETTI, PL (reprint author), UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. NR 20 TC 16 Z9 17 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD SEP 14 PY 1995 VL 357 IS 4 BP 678 EP 684 DI 10.1016/0370-2693(95)00941-D PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA RV825 UT WOS:A1995RV82500026 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E AJINENKO, I ALEKSAN, R ALEKSEEV, GD ALLPORT, PP ALMEHED, S ALVSVAAG, SJ AMALDI, U AMATO, S ANDREAZZA, A ANDRIEUX, ML ANTILOGUS, P APEL, WD ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BAUDOT, J BECKS, KH BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BLOCH, D BLUME, M BLYTH, S BOCCI, V BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSWORTH, S BOTNER, O BOUDINOV, E BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRANCHINI, P BRAND, KD BRENKE, T BRENNER, RA BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM BUGGE, L BURAN, T BURGSMUELLER, T BUSCHMANN, P BUYS, A CACCIA, M CALVI, M ROZAS, AJC CAMPORESI, T CANALE, V CANEPA, M CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAPKIN, M CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHIERICI, R CHLIAPNIKOV, P CHOCHULA, P CHOROWICZ, V CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COSSUTTI, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUM, A DAUNCEY, PD DAVENPORT, M DASILVA, W DEFOIX, C DELLARICCA, G DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DESAINTJEAN, C DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DREES, KA DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EHRET, R EIGEN, G EKELOF, T EKSPONG, G ELSING, M ENGEL, JP ERSHAIDAT, N ERZEN, B SANTO, ME FALK, E FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FISCHER, PA FOETH, H FOKITIS, E FONTANELLI, F FORMENTI, F FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FUSTER, J GALLONI, A GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GELE, D GERBER, JP GIBBS, M GOKIELI, R GOLOB, B GOPAL, G GORN, L GORSKI, M GOUZ, Y GRACCO, V GRAZIANI, E GROSDIDIER, G GUNNARSSON, P GUNTHER, M GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HALLGREN, A HAMACHER, K HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIGON, E HILKE, HJ HILL, TS HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P JACKSON, JN JACOBSSON, R JALOCHA, P JANIK, R JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONSSON, L JONSSON, P JORAM, C JUILLOT, P KAISER, M KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, K KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUMSTEIN, Z KRUPINSKI, W KUBINEC, P KUCEWICZ, W KURVINEN, K LACASTA, C LAKTINEH, I LAMBLOT, S LAMSA, JW LANCERI, L LANE, DW LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEFEBURE, V LEGAN, CK LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LIKO, D LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZ, JM LOPEZFERNANDEZ, A AGUERA, MAL LOUKAS, D LUTZ, P LYONS, L MACNAUGHTON, J MAEHLUM, G MAIO, A MALYCHEV, V MANDL, F MARCO, J MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTINEZRIVERO, C MARTINEZVIDAL, F GARCIA, SMI MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIRABITO, L MITAROFF, WA MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MUNDIM, LM MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NAVAS, S NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NIEUWENHUIZEN, M NIKOLAENKO, V NISS, P NOMEROTSKI, A NORMAND, A OBERSCHULTEBECKMANN, W OBRAZTSOV, V OLSHEVSKI, AG ONOFRE, A ORAVA, R OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAGES, P PALKA, H PAPADOPOULOU, TD PAPE, L PARKES, C PARODI, F PASSERI, A PEGORARO, M PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PHILLIPS, HT PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PUKHAEVA, N PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G RIPP, I ROMERO, A RONCAGLIOLO, I RONCHESE, P ROOS, L ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SADOVSKY, A SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEDYKH, Y SEGAR, AM SEITZ, A SEKULIN, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SITAR, B SKAALI, TB SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SPONHOLZ, P SQUARCIA, S STANESCU, C STAPNES, S STAVITSKI, I STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAUSS, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M TABARELLI, T TAVERNET, JP TCHIKILEV, O TILQUIN, A TIMMERMANS, J TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORTORA, L TRANSTROMER, G TREILLE, D TRISCHUK, W TRISTRAM, G TROMBINI, A TRONCON, C TSIROU, A TURLUER, ML TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VANELDIK, J VASSILOPOULOS, N VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VRBA, V WAHLEN, H WALCK, C WALDNER, F WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKE, D WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WOSCHNAGG, K YIP, K YUSHCHENKO, O ZACH, F ZACHARATOU, C ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUCCHELLI, GC ZUMERLE, G AF ABREU, P ADAM, W ADYE, T AGASI, E AJINENKO, I ALEKSAN, R ALEKSEEV, GD ALLPORT, PP ALMEHED, S ALVSVAAG, SJ AMALDI, U AMATO, S ANDREAZZA, A ANDRIEUX, ML ANTILOGUS, P APEL, WD ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BAUDOT, J BECKS, KH BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BLOCH, D BLUME, M BLYTH, S BOCCI, V BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSWORTH, S BOTNER, O BOUDINOV, E BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRANCHINI, P BRAND, KD BRENKE, T BRENNER, RA BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM BUGGE, L BURAN, T BURGSMUELLER, T BUSCHMANN, P BUYS, A CACCIA, M CALVI, M ROZAS, AJC CAMPORESI, T CANALE, V CANEPA, M CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAPKIN, M CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHIERICI, R CHLIAPNIKOV, P CHOCHULA, P CHOROWICZ, V CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COSSUTTI, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUM, A DAUNCEY, PD DAVENPORT, M DASILVA, W DEFOIX, C DELLARICCA, G DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DESAINTJEAN, C DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DREES, KA DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EHRET, R EIGEN, G EKELOF, T EKSPONG, G ELSING, M ENGEL, JP ERSHAIDAT, N ERZEN, B SANTO, ME FALK, E FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FISCHER, PA FOETH, H FOKITIS, E FONTANELLI, F FORMENTI, F FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FUSTER, J GALLONI, A GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GELE, D GERBER, JP GIBBS, M GOKIELI, R GOLOB, B GOPAL, G GORN, L GORSKI, M GOUZ, Y GRACCO, V GRAZIANI, E GROSDIDIER, G GUNNARSSON, P GUNTHER, M GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HALLGREN, A HAMACHER, K HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIGON, E HILKE, HJ HILL, TS HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P JACKSON, JN JACOBSSON, R JALOCHA, P JANIK, R JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONSSON, L JONSSON, P JORAM, C JUILLOT, P KAISER, M KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, K KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUMSTEIN, Z KRUPINSKI, W KUBINEC, P KUCEWICZ, W KURVINEN, K LACASTA, C LAKTINEH, I LAMBLOT, S LAMSA, JW LANCERI, L LANE, DW LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEFEBURE, V LEGAN, CK LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LIKO, D LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZ, JM LOPEZFERNANDEZ, A AGUERA, MAL LOUKAS, D LUTZ, P LYONS, L MACNAUGHTON, J MAEHLUM, G MAIO, A MALYCHEV, V MANDL, F MARCO, J MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTINEZRIVERO, C MARTINEZVIDAL, F GARCIA, SMI MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIRABITO, L MITAROFF, WA MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MUNDIM, LM MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NAVAS, S NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NIEUWENHUIZEN, M NIKOLAENKO, V NISS, P NOMEROTSKI, A NORMAND, A OBERSCHULTEBECKMANN, W OBRAZTSOV, V OLSHEVSKI, AG ONOFRE, A ORAVA, R OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAGES, P PALKA, H PAPADOPOULOU, TD PAPE, L PARKES, C PARODI, F PASSERI, A PEGORARO, M PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PHILLIPS, HT PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PUKHAEVA, N PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G RIPP, I ROMERO, A RONCAGLIOLO, I RONCHESE, P ROOS, L ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SADOVSKY, A SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEDYKH, Y SEGAR, AM SEITZ, A SEKULIN, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SITAR, B SKAALI, TB SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SPONHOLZ, P SQUARCIA, S STANESCU, C STAPNES, S STAVITSKI, I STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAUSS, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M TABARELLI, T TAVERNET, JP TCHIKILEV, O TILQUIN, A TIMMERMANS, J TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORTORA, L TRANSTROMER, G TREILLE, D TRISCHUK, W TRISTRAM, G TROMBINI, A TRONCON, C TSIROU, A TURLUER, ML TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VANELDIK, J VASSILOPOULOS, N VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VRBA, V WAHLEN, H WALCK, C WALDNER, F WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKE, D WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WOSCHNAGG, K YIP, K YUSHCHENKO, O ZACH, F ZACHARATOU, C ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUCCHELLI, GC ZUMERLE, G TI A MEASUREMENT OF THE TAU-LEPTONIC BRANCHING FRACTIONS SO PHYSICS LETTERS B LA English DT Article AB A sample of 25000 Z(0) --> tau(-)tau(+) events collected by the DELPHI experiment at LEP in 1991 and 1992 is used to measure the leptonic branching fractions of the tau lepton. The results are B(tau --> e nu<(nu)over bar>) = (17.51+/-0.39)% and B(tau --> mu nu<(nu)over bar>) = (17.02+/-0.31)%. The ratio of the muon and electron couplings to the weak charged current is measured to be g(mu)/g(e) = 1.000+/-0.013, satisfying e-mu universality. The average leptonic branching fraction corrected to the value for a massless lepton, assuming e-mu universality, is found to be B(tau --> l nu<(nu)over bar>) = (17.50+/-0.25)%. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. ULB VUB,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. PONTIFICIA UNIV CATOLICA RIO DE JANEIRO,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. UNIV ESTADUAL RIO DE JANEIRO,INST FIS,RIO JANEIRO,BRAZIL. COMENIUS UNIV BRATISLAVA,FAC MATH & PHYS,BRATISLAVA 84215,SLOVAKIA. COLL FRANCE,IN2P3,CNRS,PHYS CORPUSCULAIRE LAB,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV STRASBOURG 1,IN2P3,CNRS,CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. DEMOKRITOS NATL CTR SCI RES,INST PHYS NUCL,GR-15310 ATHENS,GREECE. ACAD SCI CZECH REPUBL,INST PHYS,FZU,DIV HIGH ENERGY PHYS,CR-18040 PRAGUE 8,CZECH REPUBLIC. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. IST NAZL FIS NUCL,I-16146 GENOA,ITALY. UNIV GRENOBLE 1,IN2P3,CNRS,INST SCI NUCL,F-38026 GRENOBLE,FRANCE. SEFT,HIGH ENERGY PHYS RES INST,SF-00014 HELSINKI,FINLAND. JOINT INST NUCL RES,MOSCOW 101000,RUSSIA. UNIV KARLSRUHE,INST EXPTL KERNPHYS,D-76128 KARLSRUHE,GERMANY. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. UNIV PARIS 11,IN2P3,CNRS,ACCELERATEUR LINEAIRE LAB,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,MERSEYSIDE,ENGLAND. UNIV PARIS 06,IN2P3,CNRS,LPNHE,F-75252 PARIS 05,FRANCE. UNIV PARIS 07,F-75252 PARIS 05,FRANCE. LUND UNIV,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV LYON 1,IPNL,IN2P3,CNRS,F-69622 VILLEURBANNE,FRANCE. UNIV COMPLUTENSE MADRID,E-28040 MADRID,SPAIN. UNIV AIX MARSEILLE 2,CPP,CNRS,IN2P3,F-13288 MARSEILLE 09,FRANCE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. CHARLES UNIV,MFF,CTR NUCL,NC,CR-18000 PRAGUE 8,CZECH REPUBLIC. NIKHEF H,1009 DB AMSTERDAM,NETHERLANDS. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV OVIEDO,DEPT FIS,E-33006 OVIEDO,SPAIN. UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. IST NAZL FIS NUCL,I-35131 PADUA,ITALY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY. IST NAZL FIS NUCL,I-00173 ROME,ITALY. CTR ETUD SACLAY,DSM,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. IST NAZL FIS NUCL,IST SUPER SANITA,I-00161 ROME,ITALY. UNIV CANTABRIA,CEAFM,CSIC,E-39006 SANTANDER,SPAIN. INST HIGH ENERGY PHYS,PROTVINO,RUSSIA. UNIV LJUBLJANA,JOZEF STEFAN INST,LJUBLJANA 61000,SLOVENIA. UNIV LJUBLJANA,DEPT PHYS,LJUBLJANA 61000,SLOVENIA. UNIV STOCKHOLM,FYSICUM,S-11385 STOCKHOLM,SWEDEN. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. IST NAZL FIS NUCL,I-10125 TURIN,ITALY. UNIV TRIESTE,DIPARTMENTO FIS,I-34127 TRIESTE,ITALY. IST NAZL FIS NUCL,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. FED UNIV RIO DE JANEIRO,BR-21945970 RIO JANEIRO,BRAZIL. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV VALENCIA,CSIC,IFIC,E-46100 BURJASSOT,SPAIN. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. OSTERR AKAD WISSENSCH,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. UNIV WARSAW,INST NUCL STUDIES,PL-00681 WARSAW,POLAND. BERG UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,D-42097 WUPPERTAL 1,GERMANY. RP ABREU, P (reprint author), INST SUPER TECN,FCUL,LIP,P-1000 LISBON,PORTUGAL. RI Dracos, Marcos/K-2335-2012; Hallgren, Allan/A-8963-2013; Nomerotski, Andrei/A-5169-2010; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; De Saint Jean, Cyrille/E-8853-2011; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Fruhwirth, Rudolf/H-2529-2012; Andreazza, Attilio/E-5642-2011; Verlato, Marco/J-4604-2012; Barao, Fernando/O-2357-2016; Navas, Sergio/N-4649-2014; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Ragazzi, Stefano/D-2463-2009; Rovelli, Tiziano/K-4432-2015; Smirnova, Oxana/A-4401-2013; Della Ricca, Giuseppe/B-6826-2013; Olshevskiy, Alexander/I-1580-2016; Rames, Jiri/H-2450-2014; Paganoni, Marco/A-4235-2016; Contreras Gonzalez, Jose Luis/K-7255-2014; Abreu, Pedro/L-2220-2014; Botner, Olga/A-9110-2013; Mundim, Luiz/A-1291-2012; Zalewski, Piotr/H-7335-2013; Marti-Garcia, Salvador/F-3085-2011; Monge, Maria Roberta/G-9127-2012; Nemecek, Stanislav/G-5931-2014; Ridky, Jan/H-6184-2014; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Espirito Santo, Maria Catarina/L-2341-2014; Pimenta, Mario/M-1741-2013; gandelman, miriam/N-3739-2014 OI Dracos, Marcos/0000-0003-0514-193X; Ruiz, Alberto/0000-0002-3639-0368; Shellard, Ronald/0000-0002-2983-1815; Petrolini, Alessandro/0000-0003-0222-7594; Andreazza, Attilio/0000-0001-5161-5759; Verlato, Marco/0000-0003-1967-7655; Barao, Fernando/0000-0002-8346-9941; Navas, Sergio/0000-0003-1688-5758; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Ragazzi, Stefano/0000-0001-8219-2074; Rovelli, Tiziano/0000-0002-9746-4842; Smirnova, Oxana/0000-0003-2517-531X; Della Ricca, Giuseppe/0000-0003-2831-6982; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Abreu, Pedro/0000-0002-9973-7314; Mundim, Luiz/0000-0001-9964-7805; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Tome, Bernardo/0000-0002-7564-8392; Espirito Santo, Maria Catarina/0000-0003-1286-7288; Pimenta, Mario/0000-0002-2590-0908; NR 7 TC 9 Z9 9 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD SEP 14 PY 1995 VL 357 IS 4 BP 715 EP 724 DI 10.1016/0370-2693(95)00987-V PG 10 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA RV825 UT WOS:A1995RV82500029 ER PT J AU DURBIN, MK SHIH, MC MALIK, A ZSCHACK, P DUTTA, P AF DURBIN, MK SHIH, MC MALIK, A ZSCHACK, P DUTTA, P TI ISOTHERM AND X-RAY-DIFFRACTION STUDIES OF MIXED MONOLAYERS SO COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS LA English DT Article DE ISOTHERMS; MIXED MONOLAYERS; X-RAY DIFFRACTION ID CHAIN FATTY-ACIDS; DOCOSYL SULFATE SYSTEM; PHASE-DIAGRAM; 2-COMPONENT MONOLAYERS; LIPID MONOLAYER; BREWSTER-ANGLE; SURFACE; WATER; TRANSITIONS; MICROSCOPY AB We have studied Langmuir monolayers of saturated fatty acid-alcohol mixtures (same chain length) and acid-acid mixtures (different chain length) using isotherms and X-ray diffraction. The diffraction data confirm that the constituents are miscible, and that at zero pressure the mixed acid-alcohol monolayer areas are less than the areas of the pure components. We have determined the phase diagrams of a number of different mixtures. In any given phase, the intermolecular distances measured perpendicular to the molecules are independent of the pressure and of the constituents of the mixture. However, the location of some phase boundaries is a strong function of the composition of the mixture. C1 NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208. OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37830. NR 27 TC 7 Z9 7 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-7757 J9 COLLOID SURFACE A JI Colloid Surf. A-Physicochem. Eng. Asp. PD SEP 13 PY 1995 VL 102 BP 173 EP 179 DI 10.1016/0927-7757(95)03192-G PG 7 WC Chemistry, Physical SC Chemistry GA RW787 UT WOS:A1995RW78700021 ER PT J AU EDLER, KJ DOUGHERTY, J DURAND, R ITON, L KIRTON, G LOCKHART, G WANG, Z WITHERS, R WHITE, JW AF EDLER, KJ DOUGHERTY, J DURAND, R ITON, L KIRTON, G LOCKHART, G WANG, Z WITHERS, R WHITE, JW TI SMALL-ANGLE X-RAY-SCATTERING FROM MCM41 AND ITS SYNTHESIS GELS - OPTIMIZATION OF THE SYNTHESIS PARAMETERS SO COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS LA English DT Article DE CHARACTERIZATION; MESOPOROUS MOLECULAR SIEVE; SYNTHESIS AB We have found optimised conditions for alkaline synthesis of the large pore molecular sieve, MCM-41, by determining small angle X-ray scattering and adsorption isotherms from materials at various stages of the preparation. The presence of highly curved surfaces, sealed structures, and quasicrystalline hexagonal products coexisting with true MCM-41 are all detected by transmission electron microscopy. Calcination must be carried out with care. The product is most crystalline from unstirred preparations which have been heated at 100 degrees C for no longer than three days. Under these conditions, a maximum BET surface area of 1950 m(2) g(-1) was attained, with evident crystallinity observed by electron diffraction and transmission electron microscopy. In the stirred system, which appears to be in a nonequilibrium state, materials after calcination exhibiting Bragg d-spacings of 35 Angstrom 37 Angstrom and 38 Angstrom have been identified. C1 AUSTRALIAN NATL UNIV,RES SCH CHEM,CANBERRA,ACT 0200,AUSTRALIA. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RI Edler, Karen/A-7324-2011; Withers, Ray/H-8309-2014 OI Edler, Karen/0000-0001-5822-0127; Withers, Ray/0000-0001-9017-2233 NR 17 TC 27 Z9 27 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-7757 J9 COLLOID SURFACE A JI Colloid Surf. A-Physicochem. Eng. Asp. PD SEP 13 PY 1995 VL 102 BP 213 EP 230 DI 10.1016/0927-7757(95)03241-5 PG 18 WC Chemistry, Physical SC Chemistry GA RW787 UT WOS:A1995RW78700025 ER PT J AU ALLEN, PG BUCHER, JJ CLARK, DL EDELSTEIN, NM EKBERG, SA GOHDES, JW HUDSON, EA KALTSOYANNIS, N LUKENS, WW NEU, MP PALMER, PD REICH, T SHUH, DK TAIT, CD ZWICK, BD AF ALLEN, PG BUCHER, JJ CLARK, DL EDELSTEIN, NM EKBERG, SA GOHDES, JW HUDSON, EA KALTSOYANNIS, N LUKENS, WW NEU, MP PALMER, PD REICH, T SHUH, DK TAIT, CD ZWICK, BD TI MULTINUCLEAR NMR, RAMAN, EXAFS, AND X-RAY-DIFFRACTION STUDIES OF URANYL CARBONATE COMPLEXES IN NEAR-NEUTRAL AQUEOUS-SOLUTION - X-RAY STRUCTURE OF [C(NH2)(3)](6)[(UO2)(3)(CO3)(6)]CENTER-DOT-6.5H(2)O SO INORGANIC CHEMISTRY LA English DT Article ID ABSORPTION FINE-STRUCTURE; ION; EQUILIBRIA; SCATTERING; SPECTROSCOPY; 25-DEGREES-C; SYSTEM; DIOXOURANIUM(VI); UO2(CO3)34; ACTINIDES AB C-13 and O-17 NMR and Raman spectroscopies were used to monitor the fractions of UO2(CO3)(3)(4-) (1) and (UO2)(3)(CO3)(6)(6-) (2) in aqueous carbonate solutions as a function of pH, ionic strength, carbonate concentration, uranium concentration, and temperature. The multinuclear NMR and Raman data are consistent with the formation of (UO2)(3)(CO3)(6)(6-). The pH dependence of the C-13 NMR spectra was used to determine the equilibrium constant for the reaction 3UO(2)(CO3)(3)(4-) + 3H(+) reversible arrow (UO2)(3)(CO3)(6)(6-) + 3HCO(3)(-), log K = 18.1(+/- 0.5) at I-m = 2.5 m and 25 degrees C, and corresponds to log beta(36) = 55.6(+/- 0.5) for the reaction 3UO(2)(2+) + 6CO(3)(2-) reversible arrow (UO2)(3)(CO3)(6)(6-) under the same conditions. Raman spectra showed the uranyl nu(1) stretching band at 831.6 cm(-1) for monomeric 1 and at 812.5 cm(-1) for trimeric (UO2)(3)(CO3)(6)(6-) (2). EXAFS data from solid [C(NH2)(3)](6)[(UO2)(3)(CO3)(6)] and a solution of (UO2)(3)(CO3)(6)(6-) suggest that the same uranium species is present in both the solid and solution states. Fourier transforms of the EXAFS spectra of both solid and solution samples revealed five well-resolved peaks corresponding to nearly identical near-neighbor distances for solid and solution- samples of 2. Fitting of these peaks yields U-O(uranyl) = 1.79, U-O(carbonate) = 2.45, U- -C = 2.90, U- -O(terminal carbonate) = 4.16, and U- -U = 4.91 Angstrom for the solid and similar distances for the solution sample. A peak at 4.75 Angstrom in both Fourier transforms (uncorrected for phase shift) corresponds to a U- -U interaction at 4.91 Angstrom, a conclusion which is supported by the absence of this peak in the Fourier transform of the crystalline monomeric K-4[UO2(CO3)(3)] Multiple scattering along the uranyl vector is believed to play a significant role in the EXAFS of all three systems. The EXAFS data are consistent with the trimeric uranyl carbonate species indicated by NMR spectroscopy. Single crystals of [C(NH2)(3)](6)[(UO2)(3)(CO3)(6)]. 6.5H(2)O were obtained from a solution that contained stoichiometric amounts of uranyl nitrate and guanidinium carbonate and an excess of guanidinium nitrate at pH 6.5 under a CO2 atmosphere. The solid state molecular structure of [C(NH2)(3)](6)[(UO2)(3)(CO3)6]. 6.5H(2)O contains a planar D-3h trimetallic (UO2)(3)(CO3)(6)(6-) anion, the structure that Aberg and co-workers originally proposed for the trimeric solution species. The trimetallic anion contains three uranium atoms and all six carbonate ligands in the molecular plane with three uranyl oxygen atoms above and three below the plane. Uranyl U=O distances average 1.78(1) Angstrom, while U-O distances to the carbonate oxygen atoms average 2.41(1) Angstrom for terminal and 2.48(1) Angstrom for bridging ligands. Particularly significant is the average nonbonding U- -U distance of 4. 97 Angstrom which compares favorably to the 4.91 Angstrom distance seen in the EXAFS analysis. The molecule crystallizes in the triclinic space group P ($) over bar 1, with a = 6.941(2) Angstrom, b = 14.488(2) Angstrom, c = 22.374(2) Angstrom, alpha = 95.63(2)degrees, beta = 98.47(2)degrees, gamma = 101.88(2)degrees, R = 0.0555, R(w), = 0.0607, V = 2158.5 Angstrom(3),d(cal), = 2.551 g cm(-3), and Z = 2. C1 LOS ALAMOS NATL LAB, DIV NUCL MAT TECHNOL, LOS ALAMOS, NM 87545 USA. UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV CHEM SCI, BERKELEY, CA 94720 USA. LAWRENCE LIVERMORE NATL LAB, GT SEABORG INST TRANSACTINIUM SCI, LIVERMORE, CA 94551 USA. FORSCHUNGSZENTRUM ROSSENDORF EV, INST RADIOCHEM, D-01314 DRESDEN, GERMANY. RP LOS ALAMOS NATL LAB, DIV CHEM SCI & TECHNOL, MAIL STOP G739, LOS ALAMOS, NM 87545 USA. RI Clark, David/A-9729-2011; Reich, Tobias/C-7064-2016 OI Reich, Tobias/0000-0002-5600-3951 NR 66 TC 153 Z9 153 U1 3 U2 55 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0020-1669 EI 1520-510X J9 INORG CHEM JI Inorg. Chem. PD SEP 13 PY 1995 VL 34 IS 19 BP 4797 EP 4807 DI 10.1021/ic00123a013 PG 11 WC Chemistry, Inorganic & Nuclear SC Chemistry GA RV737 UT WOS:A1995RV73700013 ER PT J AU BARNHART, DM FRANKCOM, TM GORDON, PL SAUER, NN THOMPSON, JA WATKIN, JG AF BARNHART, DM FRANKCOM, TM GORDON, PL SAUER, NN THOMPSON, JA WATKIN, JG TI DISSOLUTION OF LANTHANIDE AND ACTINIDE METALS USING IODINE AND 2-PROPANOL - SYNTHESIS AND X-RAY CRYSTAL-STRUCTURES OF LNI(3)(HO-I-PR)(4) (LN=LA, CE) AND TH2I4(O-I-PR)(4)(HO-I-PR)(2) SO INORGANIC CHEMISTRY LA English DT Article ID ALKOXIDES; COMPLEXES; PRECURSORS; CHEMISTRY; CHLORIDES; YTTRIUM; ADDUCTS; GLYCOL AB Reaction of lanthanum, cerium, or neodymium metals with 3/2 equiv of iodine in 2-propanol leads to formation of the alcohol adducts LnI(3)(HO-i-Pr)(4) (Ln = La (1), Ce (2), Nd (3)) in good yield. Reaction of thorium metal turnings with 2 equiv of iodine in 2-propanol produces the dimeric halide-alkoxide complex Th2I4(O-i-Pr)(4)(HO-i-Pr)(2) (4). The molecular structures of 1, 2, and 4 have been determined by means of single-crystal X-ray diffraction studies. 1 and 2 are found to be isostructural, and consist of seven-coordinate metal centers best described as capped trigonal prisms in which an iodide ligand caps a rectangular face defined by the four 2-propanol oxygen atoms. Ln-I bond lengths lie in the ranges 3.180(1)-3.224(1) for 1 and 3.157(1)-3.191(1) Angstrom for 2, while Ln-O distances to the 2-propanol ligands average 2.509(7) and 2.488(5) Angstrom for 1 and 2, respectively. 4 exhibits an edge-shared bioctahedral geometry with 2-propoxide ligands occupying bridging positions. Bridging Th-O distances in 4 are 2.327(6) and 2.399(6) Angstrom, while the Th-O distance to the terminal 2-propoxide ligand is extremely short at 2.056(7) Angstrom. The Th-O bond length to the 2-propanol ligand is characteristically long at 2.437(6) Angstrom, while Th-I distances are 3.094(1) and 3.104(1) Angstrom. Crystal data for 1 (at -70 degrees C): orthorhombic space group Pbca, a = 17.240(3) Angstrom, b = 13.944(2) Angstrom, c = 19.178(2) Angstrom, V = 4610.3 Angstrom(3), d(calc) = 2.190 g cm(-3), Z = 8, R = 0.0439, R(w) = 0.0739. Crystal data for 2 (at -70 degrees C): orthorhombic space group Pbca, a = 17.199(3) Angstrom, b = 13.884(3) Angstrom, c = 19.153(4) Angstrom, V = 4573.5 Angstrom(3), d(calc) = 2.211 g cm(-3), Z = 8, R = 0.0352, R(w) = 0.0619. Crystal data for 4 (at -48 degrees C): triclinic space group P $($) over bar$$ 1, a = 9.658(2) Angstrom, b = 9.754(2) Angstrom, c = 11.563(2) Angstrom, alpha = 109.41(3)degrees, beta = 95.18(3)degrees, gamma = 117.33(3)degrees, V = 873.5 Angstrom(3), d(calc) = 2.521 g cm(-3), Z = 1, R = 0.0319, R(w) = 0.0506. C1 LOS ALAMOS NATL LAB,DIV CHEM SCI & TECHNOL,LOS ALAMOS,NM 87545. NR 37 TC 30 Z9 30 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD SEP 13 PY 1995 VL 34 IS 19 BP 4862 EP 4867 DI 10.1021/ic00123a022 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA RV737 UT WOS:A1995RV73700022 ER PT J AU SALTIEL, J DABESTANI, R SEARS, DF MCGOWAN, WM HILINSKI, EF AF SALTIEL, J DABESTANI, R SEARS, DF MCGOWAN, WM HILINSKI, EF TI PHOTOCYCLOADDITION OF 9,10-DICHLOROANTHRACENE TO 2,5-DIMETHYL-2,4 HEXADIENE - THE SINGLET PATHWAY FOR [4+2]-ADDUCT FORMATION IN BENZENE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID PERICYCLIC REACTIONS; EXCITATION TRANSFER; ORBITAL SYMMETRY; TRIPLET-STATES; ANTHRACENES; EXCIPLEX; CHEMISTRY; EMISSION; 2,4-HEXADIENE; FLUORESCENCE AB Irradiation of 9,10-dichloroanthracene (DCA) in the presence of 2,5-dimethyl-2,4-hexadiene (DMHD) in benzene at 25 degrees C gives a single adduct (Ad) corresponding to [4 + 2] addition of DMHD to the 9,10 positions of DCA. Quantum yields for Ad formation are reported as a function of [DMHD], [DCA], and methyl iodide concentration, [MeI]. Fluorescence quantum yields and lifetimes of DCA and (DCA/DMHD) singlet exciplex as a function of [Mel] are also reported. Transient absorption measurements reveal the time evolution of excited DCA singlet, (1)DCA*, and triplet, (3)DCA*, states and of the (DCA/DMHD) singlet exciplex, (1)(DCA . DMHD)*. They show that the dominant decay path from (1)(DCA . DMHD)* gives (3)DCA*. Quenching of (1)DCA* and exciplex fluorescence and transient absorption by Mel are observed. The dependence of Ad quantum yields on [DMHD] and the strict proportionality between product quantum yields and exciplex fluorescence quantum yields at different [MeI] establish a singlet mechanism for adduct formation. Assuming that Ad is a primary photoproduct, the results are consistent with Yang's proposal of stepwise collapse of polar exciplexes to seemingly forbidden cycloadducts. A singlet biradical could be the intermediate, but intersystem crossing of the singlet exciplex to a triplet biradical as the initial step cannot be ruled out. The loss of DCA is enhanced at very high [DMHD] but oxygen quenching experiments show that this enhancement does not involve formation of the triplet biradical by addition of (3)DCA* to DMHD. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP SALTIEL, J (reprint author), FLORIDA STATE UNIV,DEPT CHEM,TALLAHASSEE,FL 32306, USA. OI Saltiel, Jack/0000-0002-8680-2551 NR 94 TC 9 Z9 9 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD SEP 13 PY 1995 VL 117 IS 36 BP 9129 EP 9138 DI 10.1021/ja00141a003 PG 10 WC Chemistry, Multidisciplinary SC Chemistry GA RU818 UT WOS:A1995RU81800003 ER PT J AU ALAJLOUNI, AM ESPENSON, JH AF ALAJLOUNI, AM ESPENSON, JH TI EPOXIDATION OF STYRENES BY HYDROGEN-PEROXIDE AS CATALYZED BY METHYLRHENIUM TRIOXIDE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID MAIN-GROUP ELEMENTS; TRANSITION-METALS; MULTIPLE BONDS; ALKYL HYDROPEROXIDES; MECHANISM; OLEFINS; COMPLEXES; METHYLTRIOXORHENIUM; MOLYBDENUM(VI); EQUILIBRIA AB Methylrhenium trioxide, CH3ReO3, catalyzes the oxidation of styrenes by hydrogen peroxide. Kinetic studies by three methods were carried out in acidic CH3CN/H2O (1:1 v/v) solutions. The catalytically-active species are the mono-peroxide, CH3Re(O)(2)(O-2), A, and the bis-peroxide, CH3Re(O)(O-2)2, B, which epoxidize a given styrene at a similar rate. The rate constants are relatively insensitive to steric hindrance, but increase with the nucleophilicity of the styrene, electron-donating groups on the olefinic carbons or on the aromatic ring enhancing the rate. The rate constants for meta- and para-substituted styrenes follow a linear Hammett relationship; correlation with sigma(+) gave rho = -0.93 + 0.05. In CD3CN, epoxides were observed by H-1 NMR spectroscopy. cis-beta-Methylstyrene and trans-beta-methylstyrene led to the cis epoxide and the trans epoxide, respectively. In acidic CH3CN/H2O, the major products were 1,2-diols. In some cases C-C bond cleavage products were also observed, the extreme case being beta-methoxystyrene where the C-C bond was completely cleaved to yield benzaldehyde, formaldehyde, and methanol. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 39 TC 152 Z9 152 U1 1 U2 18 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD SEP 13 PY 1995 VL 117 IS 36 BP 9243 EP 9250 DI 10.1021/ja00141a016 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA RU818 UT WOS:A1995RU81800016 ER PT J AU LU, SX CEBE, P CAPEL, M AF LU, SX CEBE, P CAPEL, M TI NEW-TPI THERMOPLASTIC POLYIMIDE - STRUCTURE AND RELAXATION USING SAXS AND TSDC SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article ID X-RAY-SCATTERING; ETHER KETONE) CRYSTALLIZATION; MELTING BEHAVIOR; LARC-CPI; POLYMER; HISTORY; BLENDS; PHASE AB The thermoplastic polyimide Regulus(TM) NEW-TPI has been studied using small-angle X-ray scattering (SAXS) and thermally stimulated depolarization current (TSDC). SAXS was used to study the development of lamellar structure during isothermal or nonisothermal crystallization. The one-dimensional electron-density correlation function was used to determine structural parameters. The long period, lamellar thickness, and amorphous layer thickness increase as crystallization temperature increases from 300 to 360 degrees C. By combining melting-point data with SAXS results, we report the side and fold surface free energies of NEW-TPI crystals, which are 29 +/- 3 and 41 +/- 3 erg/cm(2), respectively. Real-time SAXS was carried during nonisothermal cold-crystallization at 5 degrees C/min. The long period decreases, while lamellar thickness, linear crystallinity, and interphase thickness increase, with increasing temperature. These changes are explained by a crystal-insertion model. TSDC was used as a more sensitive probe of the amorphous phase structure below 300 degrees C. Both semicrystalline and amorphous NEW-TPI exhibit complex TSDC behavior. Above the glass transition, amorphous NEW-TPI has a strong TSDC peak attributed to short-range-ordered structures, which may serve as nucleation sites for subsequent crystallization. This peak was not seen in semicrystalline material. At the glass transition, both amorphous and semicrystalline NEW-TPI have a strong TSDC peak. In the semicrystalline polymer, relaxation of the amorphous dipoles is slightly restricted by the crystals, which results in a smaller relaxation peak and a shift to higher temperature. Below T-g, another TSDC peak occurs which is not due to dipolar relaxation. This peak is attributed to the combined effects of space charge, electrode type, ionizable species, and interfacial charges. (C) 1995 John Wiley & Sons, Inc. C1 MIT,DEPT MAT SCI & ENGN,CAMBRIDGE,MA 02139. BROOKHAVEN NATL SYNCHROTRON LIGHT SOURCE,DEPT BIOL,UPTON,NY 11973. NR 43 TC 11 Z9 11 U1 2 U2 9 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0021-8995 J9 J APPL POLYM SCI JI J. Appl. Polym. Sci. PD SEP 12 PY 1995 VL 57 IS 11 BP 1359 EP 1372 DI 10.1002/app.1995.070571112 PG 14 WC Polymer Science SC Polymer Science GA RP294 UT WOS:A1995RP29400012 ER PT J AU DUBCHAK, I MUCHNIK, I HOLBROOK, SR KIM, SH AF DUBCHAK, I MUCHNIK, I HOLBROOK, SR KIM, SH TI PREDICTION OF PROTEIN-FOLDING CLASS USING GLOBAL DESCRIPTION OF AMINO-ACID-SEQUENCE SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID SECONDARY STRUCTURE PREDICTION; NEURAL-NETWORK APPROACH; GLOBULAR-PROTEINS; PATTERNS; CLASSIFICATION; FAMILIES AB We present a method for predicting protein folding class based on global protein chain description and a voting process. Selection of the best descriptors was achieved by a computer-simulated neural network trained on a data base consisting of 83 folding classes, Protein-chain descriptors include overall composition, transition, and distribution of amino acid attributes, such as relative hydrophobicity, predicted secondary structure, and predicted solvent exposure, Cross-validation testing was performed on 15 of the largest classes. The test shows that proteins were assigned to the correct class (correct positive prediction) with an average accuracy of 71.7%, whereas the inverse prediction of proteins as not belonging to a particular class (correct negative prediction) was 90-95% accurate. When tested on 254 structures used in this study, the top two predictions contained the correct class in 91% of the cases. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RUTGERS STATE UNIV,CTR OPERAT RES,NEW BRUNSWICK,NJ 08903. RP DUBCHAK, I (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 28 TC 194 Z9 205 U1 0 U2 3 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD SEP 12 PY 1995 VL 92 IS 19 BP 8700 EP 8704 DI 10.1073/pnas.92.19.8700 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA RU759 UT WOS:A1995RU75900034 PM 7568000 ER PT J AU SLATKIN, DN SPANNE, P DILMANIAN, FA GEBBERS, JO LAISSUE, JA AF SLATKIN, DN SPANNE, P DILMANIAN, FA GEBBERS, JO LAISSUE, JA TI SUBACUTE NEUROPATHOLOGICAL EFFECTS OF MICROPLANAR BEAMS OF X-RAYS FROM A SYNCHROTRON WIGGLER SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE MICROBEAM; RADIOTHERAPY; NEUROPATHOLOGY ID RADIATION-THERAPY; LIGHT-SOURCE; IRRADIATION; TOLERANCE AB Microplanar beam radiation therapy has been proposed to treat brain tumors by using a series of rapid exposures to an array of parallel x-ray beams, each beam having uniform microscopic thickness and macroscopic breadth (i.e., microplanar). Thirty-six rats were exposed head-on either to an upright 4 mm-high, 20- or 37-mu m-wide beam or to a horizontal 7-mm-wide, 42-mu m-high beam of mostly 32- to 126-keV, minimally divergent x-rays from the X17 wiggler at the National Synchrotron Light Source at Brookhaven National Laboratory. Parallel slices of the head, separated at either 75 or 200 mu m on center, were exposed sequentially at 310-650 grays (Gy) per second until each skin-entrance absorbed dose reached 312, 625, 1250, 2500, 5000, or 10,000 Gy. The rats were euthanized 2 weeks or 1 month later, Two rats with 10,000-Gy-entrance slices developed brain tissue necrosis, All the other 10,000- and 5000-Gy-entrance slices and some of the 2500- and 1250-Gy-entrance slices showed loss of neuronal and astrocytic nuclei and their perikarya. No other kind of brain damage was evident histologically in any rat with entrance absorbed doses less than or equal to 5000 Gy, Brain tissues in and between all the 312- and 625-Gy-entrance slices appeared normal. This unusual resistance to necrosis is central to the rationale of microplanar beam radiation therapy for brain tumors. C1 KANTONSSPITAL,INST PATHOL,CH-6004 LUZERN,SWITZERLAND. UNIV BERN,INST PATHOL,CH-3010 BERN,SWITZERLAND. RP SLATKIN, DN (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. NR 38 TC 137 Z9 138 U1 1 U2 3 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD SEP 12 PY 1995 VL 92 IS 19 BP 8783 EP 8787 DI 10.1073/pnas.92.19.8783 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA RU759 UT WOS:A1995RU75900051 PM 7568017 ER PT J AU SELINDER, TI MILLER, DJ GRAY, KE AF SELINDER, TI MILLER, DJ GRAY, KE TI IN-SITU X-RAY-DIFFRACTION STUDY OF THE ROLE OF ANNEALING AMBIENT IN EPITAXIAL COSI2 GROWTH FROM CO/TI BILAYERS ON SI(001) SO APPLIED PHYSICS LETTERS LA English DT Article AB The reactions during annealing of a Co/Ti bilayer structure on Si(001) were studied in situ to reveal the roles of the Ti interlayer and the annealing ambient on the formation of epitaxial CoSi2. We shown that an oxygen contaminant in the nitrogen annealing gas is needed to form a stable, Co-Ti-O (spinel) membrane at the metal/Si interface that limits diffusion and is crucial for the perfection of epitaxial CoSi2. Annealing in vacuum or otherwise inert environments led to polycrystalline CoSi2 films and no spinel phase. (C) 1995 American Institute of Physics. C1 ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. NR 8 TC 23 Z9 23 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0003-6951 EI 1077-3118 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 11 PY 1995 VL 67 IS 11 BP 1597 EP 1599 DI 10.1063/1.114951 PG 3 WC Physics, Applied SC Physics GA RT787 UT WOS:A1995RT78700034 ER PT J AU HOFFMAN, DC AF HOFFMAN, DC TI TRANSFERMIUM ELEMENTS SO CHEMICAL & ENGINEERING NEWS LA English DT Letter RP HOFFMAN, DC (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY NATL LAB,BERKELEY,CA 94720, USA. NR 1 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0009-2347 J9 CHEM ENG NEWS JI Chem. Eng. News PD SEP 11 PY 1995 VL 73 IS 37 BP 5 EP 5 PG 1 WC Chemistry, Multidisciplinary; Engineering, Chemical SC Chemistry; Engineering GA RU351 UT WOS:A1995RU35100003 ER PT J AU ALON, RN MIRNY, L SUSSMAN, JL GUTNICK, DL AF ALON, RN MIRNY, L SUSSMAN, JL GUTNICK, DL TI DETECTION OF ALPHA/BETA-HYDROLASE FOLD IN THE CELL-SURFACE ESTERASES OF ACINETOBACTER SPECIES USING AN ANALYSIS OF 3D PROFILES SO FEBS LETTERS LA English DT Article DE ACINETOBACTER; ESTERASE; ALPHA/BETA HYDROLASE FOLD; STRUCTURAL ALIGNMENT ID ESCHERICHIA-COLI; CALCOACETICUS; EXPRESSION; SEQUENCE; PROTEINS; CLONING; EMULSAN; SEARCH; RAG-1; GENE AB The primary sequence of esterases from Acinetobacter lwoffii RAG-1 and A. calcoaceticus BD413 were compared with linearized structural sequences of two hundred proteins selected from Brookhaven Protein DataBank using a modified version of the Bowie et al, algorithm [3]. Significant structural homology was found to alpha/beta proteins and specifically to those with the alpha/beta-hydrolase fold for,which the crystal structure was reported. No such homology was detected using common primary sequence alignment programs such as FASTA or BLAST. C1 TEL AVIV UNIV,GEORGE S WISE FAC LIFE SCI,DEPT MOLEC MICROBIOL & BIOTECHNOL,IL-69978 RAMAT AVIV,ISRAEL. WEIZMANN INST SCI,DEPT BIOL STRUCT,IL-76100 REHOVOT,ISRAEL. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NR 15 TC 7 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0014-5793 J9 FEBS LETT JI FEBS Lett. PD SEP 11 PY 1995 VL 371 IS 3 BP 231 EP 235 DI 10.1016/0014-5793(95)00861-3 PG 5 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA RV262 UT WOS:A1995RV26200006 PM 7556598 ER PT J AU BOUDARD, M DEBOISSIEU, M KYCIA, S GOLDMAN, AI HENNION, B BELLISSEN, R QUILICHINI, M CURRAT, R JANOT, C AF BOUDARD, M DEBOISSIEU, M KYCIA, S GOLDMAN, AI HENNION, B BELLISSEN, R QUILICHINI, M CURRAT, R JANOT, C TI OPTIC MODES IN THE ALPDMN ICOSAHEDRAL PHASE SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID INELASTIC-NEUTRON-SCATTERING; AL-PD-MN; INCOMMENSURATE CRYSTAL PHASES; ALFECU QUASI-CRYSTALS; LATTICE-DYNAMICS; SPECIAL POINTS; LI-CU; DIFFRACTION; EXCITATIONS; AL0.86MN0.14 AB The dynamics of the icosahedral phase AlPdMn have been reinvestigated on a centimetre-size single grain using inelastic neutron scattering measurements. As previously found, well defined acoustic modes are observed close to strong Bragg reflections. Transverse acoustic phonons remain resolution limited for wavevectors smaller than 0.35 Angstrom(-1) and a broadening occurs for larger wavevectors. Beside acoustic modes, the scattering function S(Q, omega) shows an extremely rich structure. A series of broad (1 THz) dispersionless excitations appears with energies close to 1.8, 3, 4 and 5.5 THz. These excitations were found at different points in reciprocal space and present intensity variation. Some of these 'optic' bands might be associated with crossings at quasi-Brillouin zone boundaries. The system has also been investigated at high temperatures up to 800 degrees C. Beyond a 10% reduction of the sound velocity, results are identical to those obtained at room temperature. In particular the transverse acoustic modes remain resolution limited for wavevectors smaller than 0.35 Angstrom(-1). C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. US DOE,AMES LAB,AMES,IA 50011. CENS,LAB LEON BRILLOUIN,F-91191 GIF SUR YVETTE,FRANCE. ILL GRENOBLE,F-38042 GRENOBLE 9,FRANCE. CNRS,CRISTALLOG LAB,F-38042 GRENOBLE,FRANCE. RP BOUDARD, M (reprint author), LTPCM,ENSEEG,CNRS,UA 29,BP 75,F-38402 ST MARTIN DHERES,FRANCE. NR 54 TC 48 Z9 49 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD SEP 11 PY 1995 VL 7 IS 37 BP 7299 EP 7308 DI 10.1088/0953-8984/7/37/004 PG 10 WC Physics, Condensed Matter SC Physics GA RV093 UT WOS:A1995RV09300004 ER PT J AU QIU, XZ WANG, XJ BATCHELOR, K BENZVI, I AF QIU, XZ WANG, XJ BATCHELOR, K BENZVI, I TI CONCEPTUAL DESIGN OF A CHARGED-PARTICLE BEAM ENERGY SPECTROMETER UTILIZING TRANSITION RADIATION GRATING SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID DIAGNOSTICS; SCATTERING AB A new technique of measuring the energy spectrum of a charged particle beam using optical transition radiation is presented in this paper. The charged particle beam energy spectrum can be studied by analyzing the optical spectrum of the optical transition radiation produced in a multi-foil configuration. This type of energy spectrometer can have a very large energy acceptance which can not be matched by a simple conventional magnetic dipole spectrometer. The theory of transition radiation from a single boundary and from a foil with finite thickness are reviewed. Multi-foil transition radiation theory and its application for charged particle beam energy spectrum measurement are presented. The practical issues which may affect the performance of a multi-foil transition radiation energy spectrometer are discussed. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 13 TC 1 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD SEP 11 PY 1995 VL 363 IS 3 BP 520 EP 525 DI 10.1016/0168-9002(95)00404-1 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA RU800 UT WOS:A1995RU80000003 ER PT J AU SWARTZ, M BAND, HR DECKER, FJ EMMA, P FERO, MJ FREY, R KING, R LATH, A LIMBERG, T PREPOST, R ROWSON, PC SCHUMM, BA WOODS, M ZOLOTOREV, M AF SWARTZ, M BAND, HR DECKER, FJ EMMA, P FERO, MJ FREY, R KING, R LATH, A LIMBERG, T PREPOST, R ROWSON, PC SCHUMM, BA WOODS, M ZOLOTOREV, M TI OBSERVATION OF TARGET ELECTRON MOMENTUM EFFECTS IN SINGLE-ARM MOLLER POLARIMETRY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID PAIR AB In 1992, L.G. Levchuk noted that the asymmetries measured in Moller scattering polarimeters could be significantly affected by the intrinsic momenta of the target electrons. This effect is largest in devices with very small acceptance or very high resolution in laboratory scattering angle. We use a high resolution polarimeter in the linac of the polarized SLAG Linear Collider to study this effect. We observe that the inclusion of the effect alters the measured beam polarization by -14% of itself and produces a result that is consistent with measurements from a Compton polarimeter. Additionally, the inclusion of the effect is necessary to correctly simulate the observed shape of the two-body elastic scattering peak. C1 COLUMBIA UNIV,NEW YORK,NY 10027. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. UNIV OREGON,EUGENE,OR 97403. UNIV WISCONSIN,MADISON,WI 53706. RP SWARTZ, M (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. RI Frey, Raymond/E-2830-2016 OI Frey, Raymond/0000-0003-0341-2636 NR 18 TC 20 Z9 21 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD SEP 11 PY 1995 VL 363 IS 3 BP 526 EP 537 DI 10.1016/0168-9002(95)00384-3 PG 12 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA RU800 UT WOS:A1995RU80000004 ER PT J AU BASTEROGIL, M PEREZMERCADER, J AF BASTEROGIL, M PEREZMERCADER, J TI EFFECTIVE COUPLINGS AND PERTURBATIVE UNIFICATION SO NUCLEAR PHYSICS B LA English DT Article ID GRAND UNIFIED THEORIES; MINIMAL SU(5) SUPERGRAVITY; DEEP-INELASTIC-SCATTERING; EFFECTIVE GAUGE-THEORIES; NO-SCALE SUPERGRAVITY; HADRONIC-Z-DECAYS; ALPHA-S; PROTON STABILITY; RENORMALIZATION GROUP; RADIATIVE-CORRECTIONS AB In this paper we study the influence of the threshold effects due to massive degrees of freedom in the evolution with scale of gauge coupling constants. We first describe in detail the (standard) mass-dependent renormalization prescription we use. This guides us to introduce and work with effective couplings, which are finite, process independent, and include complete threshold effects. We compute the evolution of the effective couplings in both, the Standard Model and its Minimal Supersymmetric extension, from m(z) to the high energy region, We find that the effects from thresholds due to the standard massive gauge bosons are non-negligible, contrary to what is generally assumed when using other, less accurate, descriptions of the thresholds, as for example in the step-function approximation. Moreover, we find that thresholds are relevant when studying perturbative susy unification, changing the conclusions reached when using the step-function approach, We find that threshold effects bring conflict between the known experimental data at m(z), the naturalness upper bound on the masses of susy partners and the perturbative unification of couplings. C1 CSIC,INST MATEMAT & FIS FUNDAMENTAL,E-28006 MADRID,SPAIN. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP BASTEROGIL, M (reprint author), ASTROFIS ESPACIAL & FIS FUNDAMENTAL LAB,APARTADO 50727,E-28080 MADRID,SPAIN. RI Bastero-Gil, Mar/F-1405-2016 OI Bastero-Gil, Mar/0000-0001-9962-5905 NR 81 TC 19 Z9 19 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD SEP 11 PY 1995 VL 450 IS 1-2 BP 21 EP 59 DI 10.1016/0550-3213(95)00284-Y PG 39 WC Physics, Particles & Fields SC Physics GA RU567 UT WOS:A1995RU56700002 ER PT J AU FRIEMAN, JA HILL, CT STEBBINS, A WAGA, I AF FRIEMAN, JA HILL, CT STEBBINS, A WAGA, I TI COSMOLOGY WITH ULTRALIGHT PSEUDO NAMBU-GOLDSTONE BOSONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID PHASE-TRANSITIONS; CONSTANT; MODELS; FIELD; EVOLUTION AB We explore the cosmological implications of an ultralight pseudo Nambu-Goldstone boson. With global spontaneous symmetry breaking scale f similar or equal to 10(18) GeV and explicit breaking scale comparable to Mikheyev-Smirnov-Wolfenstein neutrino masses, M similar to 10(-3) eV, such a field, which acquires a mass m(phi) similar to M(2)/f, similar to H-0, would currently dominate the energy density of the Universe. The field acts as an effective cosmological constant before relaxing into a condensate of nonrelativistic bosons. Such a model can reconcile dynamical estimates of the density parameter, Omega(m) similar to 0.2, with a spatially flat universe, yielding H(0)t(0) similar or equal to 1 consistent with limits from gravitational lens statistics. C1 UNIV CHICAGO,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. FERMILAB NATL ACCELERATOR LAB,DEPT THEORET PHYS,BATAVIA,IL 60510. FED UNIV RIO DE JANEIRO,INST FIS,BR-21943 RIO JANEIRO,BRAZIL. RP FRIEMAN, JA (reprint author), FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510, USA. RI Waga, Ioav/B-6288-2014 NR 33 TC 572 Z9 573 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 11 PY 1995 VL 75 IS 11 BP 2077 EP 2080 DI 10.1103/PhysRevLett.75.2077 PG 4 WC Physics, Multidisciplinary SC Physics GA RT810 UT WOS:A1995RT81000003 ER PT J AU PARTLAN, MD ALBERGO, S BIESER, F BRADY, FP CACCIA, Z CEBRA, D CHACON, AD CHANCE, J CHOI, Y COSTA, S ELLIOTT, JB GILKES, ML HAUGER, JA HIRSCH, AS HJORT, EL INSOLIA, A JUSTICE, M KEANE, D KINTNER, J LISA, MA MATIS, HS MCMAHAN, M MCPARLAND, C OLSON, DL PEILERT, G PORILE, NT POTENZA, R RAI, G RASMUSSEN, J RITTER, HG ROMANSKI, J ROMERO, JL RUSSO, GV SCHARENBERG, RP SCOTT, A SHAO, Y SRIVASTAVA, BK SYMONS, TJM TINCKNELL, ML TUVE, C WANG, S WARREN, PG WIEMAN, HH WOLF, K AF PARTLAN, MD ALBERGO, S BIESER, F BRADY, FP CACCIA, Z CEBRA, D CHACON, AD CHANCE, J CHOI, Y COSTA, S ELLIOTT, JB GILKES, ML HAUGER, JA HIRSCH, AS HJORT, EL INSOLIA, A JUSTICE, M KEANE, D KINTNER, J LISA, MA MATIS, HS MCMAHAN, M MCPARLAND, C OLSON, DL PEILERT, G PORILE, NT POTENZA, R RAI, G RASMUSSEN, J RITTER, HG ROMANSKI, J ROMERO, JL RUSSO, GV SCHARENBERG, RP SCOTT, A SHAO, Y SRIVASTAVA, BK SYMONS, TJM TINCKNELL, ML TUVE, C WANG, S WARREN, PG WIEMAN, HH WOLF, K TI FRAGMENT FLOW IN AU+AU COLLISIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID HEAVY-ION COLLISIONS; RELATIVISTIC NUCLEAR COLLISIONS; TRANSVERSE-MOMENTUM; COLLECTIVE MOTION; ENERGY; DISAPPEARANCE; DEPENDENCE; MODELS; MASS AB Exclusive measurements have been made of Au+Au reactions with beam energies ranging from 0.25A to 1.15A GeV. We present measurements of directed collective flow averaged over all light fragments with masses up to alphas, as veil as separate measurements for protons, deuterons, tritons, He-3, He-4, acid Li. The results show a strong increase of the directed how with fragment mass at all energies measured. Experimental results are compared with a quantum molecular dynamics model. We find that neither the ''soft'' nor the ''hard'' equation of state can describe the data over the entire range of beam energies. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. KENT STATE UNIV,KENT,OH 44242. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV CALIF DAVIS,DAVIS,CA 95616. TEXAS A&M UNIV,COLLEGE STN,TX 77843. UNIV CATANIA,CATANIA,ITALY. INST NAZL FIS NUCL,CATANIA,ITALY. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RI Insolia, Antonio/M-3447-2015; TUVE', Cristina/P-3933-2015 OI Insolia, Antonio/0000-0002-9040-1566; TUVE', Cristina/0000-0003-0739-3153 NR 23 TC 93 Z9 95 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 11 PY 1995 VL 75 IS 11 BP 2100 EP 2103 DI 10.1103/PhysRevLett.75.2100 PG 4 WC Physics, Multidisciplinary SC Physics GA RT810 UT WOS:A1995RT81000009 ER PT J AU SUH, BJ BORSA, F MILLER, LL CORTI, M JOHNSTON, DC TORGESON, DR AF SUH, BJ BORSA, F MILLER, LL CORTI, M JOHNSTON, DC TORGESON, DR TI SPIN CORRELATIONS AND MAGNETIC-FIELD EFFECTS IN THE WEAKLY ANISOTROPIC SQUARE-LATTICE ANTIFERROMAGNET SR2CUO2CL2 SO PHYSICAL REVIEW LETTERS LA English DT Article ID QUANTUM MONTE-CARLO; HEISENBERG-ANTIFERROMAGNET; LA2CUO4; ND2CUO4; TMMC AB Cl-35 nuclear spin-lattice relaxation rate (NSLR) and magnetic susceptibility (chi) measurements are reported for Sr2CuO2Cl2 single crystals as functions of temperature and of magnetic field intensity and orientation. From the anisotropy of the Cl-35 NSLR and chi we obtained evidence for a crossover of the Cu2+ spin correlations from Heisenberg to XY-like at T approximate to 290 K. For H parallel to c the 3D antiferromagnetic transition is at T-N = 257 K and is field independent while for H parallel to ab T-N increases to 265 K at H = 8.2 T. The held-dependent T-N for H parallel to ab is explained by a held-induced Ising-like anisotropy in the ab plane. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. UNIV PAVIA,DIPARTIMENTO FIS A VOLTA,I-27100 PAVIA,ITALY. RP SUH, BJ (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 24 TC 34 Z9 34 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 11 PY 1995 VL 75 IS 11 BP 2212 EP 2215 DI 10.1103/PhysRevLett.75.2212 PG 4 WC Physics, Multidisciplinary SC Physics GA RT810 UT WOS:A1995RT81000037 ER PT J AU WEITZ, DA LADD, AJC AF WEITZ, DA LADD, AJC TI SCALING OF TRANSIENT HYDRODYNAMIC INTERACTIONS IN CONCENTRATED SUSPENSIONS - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Note ID MOTION C1 EXXON RES & ENGN CO,ANNANDALE,NJ 08801. CORNELL UNIV,DEPT THEORET & APPL MECH,ITHACA,NY 14853. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 7 TC 2 Z9 2 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 11 PY 1995 VL 75 IS 11 BP 2253 EP 2253 DI 10.1103/PhysRevLett.75.2253 PG 1 WC Physics, Multidisciplinary SC Physics GA RT810 UT WOS:A1995RT81000051 ER PT J AU BOERNKE, WE MILLARD, CS STEVENS, PW KAKAR, SN STEVENS, FJ DONNELLY, MI AF BOERNKE, WE MILLARD, CS STEVENS, PW KAKAR, SN STEVENS, FJ DONNELLY, MI TI STRINGENCY OF SUBSTRATE-SPECIFICITY OF ESCHERICHIA-COLI MALATE-DEHYDROGENASE SO ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS LA English DT Article ID L-LACTATE DEHYDROGENASE; SITE-DIRECTED MUTAGENESIS; BACILLUS-STEAROTHERMOPHILUS; TERNARY COMPLEX; NUCLEOTIDE-SEQUENCE; CRYSTAL-STRUCTURE; THERMUS-FLAVUS; RESOLUTION; EXPRESSION; CLONING AB Malate dehydrogenase and lactate dehydrogenase are members of the structurally and functionally homologous family of 2-ketoacid dehydrogenases. Both enzymes display high specificity for their respective keto substrates, oxaloacetate and pyruvate. Closer analysis of their specificity, however, reveals that the specificity of malate dehydrogenase is much stricter and less malleable than that of lactate dehydrogenase. Site-specific mutagenesis of the two enzymes in an attempt to reverse their specificity has met with contrary results. Conversion of a specific active-site glutamine to arginine in lactate dehydrogenase from Bacillus stearothermophilus generated an enzyme that displayed activity toward oxaloacetate equal to that of the native enzyme toward pyruvate (H. M. Wilks et al. (1988) Science 242, 1541-1544). We have constructed a series of mutants in the mobile, active site loop of the Escherichia coli malate dehydrogenase that incorporate the complementary change, conversion of arginine 81 to glutamine, to evaluate the role of charge distribution and conformational flexibility within this loop in defining the substrate specificity of these enzymes. Mutants incorporating the change R81Q all had reversed specificity, displaying much higher activity toward pyruvate than to the natural substrate, oxaloacetate. In contrast to the mutated lactate dehydrogenase, these reversed-specificity mutants were much less active than the native enzyme. Secondary mutations within the loop of the E. coli enzyme (A80N, A80P, A80P/M85E/D86T) had either no or only moderately beneficial effects on the activity of the mutant enzyme toward pyruvate. The mutation A80P, which can be expected to reduce the overall flexibility of the loop, modestly improved activity toward pyruvate. The possible physiological relevance of the stringent specificity of malate dehydrogenase was investigated. In normal strains off. coli, fermentative metabolism was not affected by expression of the mutant malate dehydrogenase. However, when expressed in a strain of E. coli unable to ferment glucose, the mutant enzyme restored growth and produced lactic acid as the sole fermentation product. (C) 1995 Academic Press, Inc. C1 ARGONNE NATL LAB,DIV ENVIRONM RES,ARGONNE,IL 60439. NEBRASKA WESLEYAN UNIV,DEPT BIOL,LINCOLN,NE 68504. NORTHWESTERN UNIV,DEPT BIOMED ENGN,EVANSTON,IL 60308. ARGONNE NATL LAB,CTR MECHANIST BIOL & BIOTECHNOL,ARGONNE,IL 60439. NR 42 TC 37 Z9 39 U1 0 U2 5 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0003-9861 J9 ARCH BIOCHEM BIOPHYS JI Arch. Biochem. Biophys. PD SEP 10 PY 1995 VL 322 IS 1 BP 43 EP 52 DI 10.1006/abbi.1995.1434 PG 10 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA RU852 UT WOS:A1995RU85200006 PM 7574693 ER PT J AU LASSIG, JP SHULTZ, MD GOOCH, MG EVANS, BR WOODWARD, J AF LASSIG, JP SHULTZ, MD GOOCH, MG EVANS, BR WOODWARD, J TI INHIBITION OF CELLOBIOHYDROLASE-I FROM TRICHODERMA-REESEI BY PALLADIUM SO ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS LA English DT Article ID DOMAIN AB Cellulase from Trichoderma reesei is a multienzyme mixture that hydrolyzes cellulose to glucose. Two enzymes in this mixture, cellobiohydrolase (CBH) and endoglucanase (EG), possess a common structure comprising a distinct cellulose-binding domain (CBD) and catalytic domain. Inhibition of the catalytic domain of cellulases without affecting their CBD function might be useful for structure/function studies of these enzymes, Complexes of the platinum group metals were tested for their ability to inhibit the major cellulase enzyme from T. reesei, cellobiohydrolase I (CBH I). Only palladium complexes inhibited CBH I, inhibition being dependent upon the molar ratio of palladium to CEH I with 1 mu M CBH I retaining only 10% of its activity in the presence of 100 mu M ammonium hexachloropalladate(IV) and after the incorporation of 28 mol Pd/mol CBH I. Inhibition was irreversible and could be completely prevented by including histidine, cysteine, and cystine in the assay mixture, Although the primary mechanism of inhibition of CBH I by palladium remains to be elucidated, it could involve the binding of palladium to sulfur or cystine residues resulting in their degradation, This is based on the findings that (i) palladium-inhibited CBH I was less thermally stable than native CBH I; (ii) CBH I, chemically modified by the attachment of pentaammine ruthenium(III) to the imidazole-N of either H206 or H228, showed greater sensitivity to inhibition by palladium compared to native CBH I; and (iii) ammonium hexachloropalladate cleaved 5,5'-dithiobis(2-nitrobenzoic acid)-Ellman's reagent. Binding of CBH I to crystalline cotton linters was not affected by palladium. (C) 1995 Academic Press, Inc. C1 OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831. NR 27 TC 16 Z9 16 U1 4 U2 7 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0003-9861 J9 ARCH BIOCHEM BIOPHYS JI Arch. Biochem. Biophys. PD SEP 10 PY 1995 VL 322 IS 1 BP 119 EP 126 DI 10.1006/abbi.1995.1443 PG 8 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA RU852 UT WOS:A1995RU85200015 PM 7574665 ER PT J AU BECKER, RH WHITE, RL HELFAND, DJ AF BECKER, RH WHITE, RL HELFAND, DJ TI THE FIRST SURVEY - FAINT IMAGES OF THE RADIO SKY AT 20 CENTIMETERS SO ASTROPHYSICAL JOURNAL LA English DT Article DE RADIO CONTINUUM, GENERAL; SURVEYS ID GALACTIC PLANE; SOURCE COUNTS; GALAXY; SPECTROSCOPY; MILLIJANSKY; POPULATION; MULTICOLOR; EVOLUTION AB The FIRST survey to produce Faint Images of the Radio Sky at Twenty centimeters is now underway using the NRAO Very Large Array. We describe here the scientific motivation for a large-area sky survey at radio frequencies which has a sensitivity and angular resolution comparable to the Palomar Observatory Sky Survey, and we recount the history that led to the current survey project. The technical design of the survey is covered in detail, including a description and justification of the grid pattern chosen, the rationale behind the integration time and angular resolution selected, and a summary of the other considerations which informed our planning for the project. A comprehensive description of the automated data analysis pipeline we have developed is presented. We also report here the results of the first year of FIRST observations. A total of 144 hr of time in 1993 April and May was used for a variety of tests, as well as to cover an initial strip of the survey extending between 07(h)15(m) and 16(h)30(m) in a 2.degrees 8 wide declination zone passing through the local zenith (28.2 < delta < 31.0). A total of 2153 individual pointings yielded an image database containing 1039 merged images 46.'5 x 34.'5 in extent with 1.'' 8 pixels and a typical rms of 0.13 mJy. A catalog derived from this 300 deg(2) region contains 28,000 radio sources. We have performed extensive tests on the images and source list in order to establish the photometric and astrometric accuracy of these data products. We find systematic astrometric errors of <0.'' 05; individual sources down to the 1 mJy survey flux density threshold have 90% confidence error circles with radii of < 1 ''. CLEAN bias introduces a systematic underestimate of point-source flux densities of similar to 0.25 mJy; the bias is more severe for extended sources. Nonetheless, a comparison with a published deep survey field demonstrates that we successfully detect 39/49 sources with integrated flux densities greater than 0.75 mJy, including 19 of 20 sources above 2.0 mJy; the sources not detected are known to be very extended and so have surface brightnesses well below our threshold. With 480 hr of observing time committed for each of the next three B-configuration periods, FIRST will complete nearly one-half of its goal of covering the 10,000 deg(2) of the north Galactic cap scheduled for inclusion in the Sloan Digital Sky Survey. All of the FIRST data-raw visibilities, self-calibrated UV data sets, individual pointing maps, final merged images, source catalogs, and individual source images-are being placed in the public domain as soon as they are verified; all of the 1993 data are now available through the NRAO and/or the STScI archive. We conclude with a brief summary of the scientific significance of FIRST, which represents an improvement by a factor of 50 in both angular resolution and sensitivity over the best available large area radio surveys. C1 LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94450. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. COLUMBIA UNIV,DEPT ASTRON,NEW YORK,NY 10027. COLUMBIA UNIV,COLUMBIA ASTROPHYS LAB,NEW YORK,NY 10027. RP BECKER, RH (reprint author), UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616, USA. NR 34 TC 1529 Z9 1535 U1 2 U2 13 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 10 PY 1995 VL 450 IS 2 BP 559 EP 577 DI 10.1086/176166 PN 1 PG 19 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RT244 UT WOS:A1995RT24400009 ER PT J AU RODRIGUEZ, JP AF RODRIGUEZ, JP TI LAYERED XY MODELS, ANYON SUPERCONDUCTORS, AND SPIN-LIQUIDS SO EUROPHYSICS LETTERS LA English DT Article ID HIGH-TC SUPERCONDUCTORS; PHASE-TRANSITION; HIGH-TEMPERATURE; VALENCE-BOND; VORTICES; STATES AB The partition function of the double-layer XY model in the (dual) Villain form is computed exactly in the limit of weak coupling between layers. Both layers are locked together through the Berezinskii-Kosterlitz-Thouless transition, while they decouple well inside the normal phase. These results are recovered in the general case of a finite number of layers. When re-interpreted in terms of the dual problems of lattice anyon superconductivity and of spin-liquids, they also indicate that the essential nature of the transition into the <> state found in two dimensions persists in the case of a finite number of weakly coupled layers. C1 CALIF STATE UNIV LOS ANGELES,DEPT PHYS & ASTRON,LOS ANGELES,CA 90032. RP RODRIGUEZ, JP (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 24 TC 9 Z9 9 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD SEP 10 PY 1995 VL 31 IS 8 BP 479 EP 484 DI 10.1209/0295-5075/31/8/010 PG 6 WC Physics, Multidisciplinary SC Physics GA RW256 UT WOS:A1995RW25600010 ER PT J AU HOLLERBACH, R KERSWELL, RR AF HOLLERBACH, R KERSWELL, RR TI OSCILLATORY INTERNAL SHEAR LAYERS IN ROTATING AND PRECESSING FLOWS SO JOURNAL OF FLUID MECHANICS LA English DT Article AB We present a direct numerical solution of a particular inertial oscillation, the so-called 'spin-over' mode, in spherical geometry. This mode is particularly relevant to the fluid flow within a precessing oblate spheroid. We demonstrate that the oscillatory Ekman layer breaks down at +/-30 degrees latitude, and that this breakdown spawns internal shear layers. We show that the structure of these shear layers is different for a full sphere and a spherical shell, as noted in the preceding paper (Kerswell 1995). Despite the existence of these shear layers, however, the numerical decay rates agree to within 1% with the asymptotic decay rates, which neglect any possible shear layers. Finally, we consider the nonlinear mean flow profiles driven by this mode, and demonstrate that our numerical results agree reasonably well with experimental results. C1 UNIV NEWCASTLE UPON TYNE,DEPT MATH & STAT,NEWCASTLE TYNE NE1 7RU,TYNE & WEAR,ENGLAND. RP HOLLERBACH, R (reprint author), LOS ALAMOS NATL LAB,INST GEOPHYS & PLANETARY PHYS,LOS ALAMOS,NM 87545, USA. OI Hollerbach, Rainer/0000-0001-8639-0967 NR 18 TC 81 Z9 81 U1 0 U2 1 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0022-1120 J9 J FLUID MECH JI J. Fluid Mech. PD SEP 10 PY 1995 VL 298 BP 327 EP 339 DI 10.1017/S0022112095003338 PG 13 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA RX566 UT WOS:A1995RX56600013 ER PT J AU MINSHULL, TA MORRIS, E DETRICK, RS AF MINSHULL, TA MORRIS, E DETRICK, RS TI GRAVITY-ANOMALIES AND CRUSTAL STRUCTURE AT THE MESOZOIC BLAKE SPUR FRACTURE-ZONE SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID MID-ATLANTIC RIDGE; EAST PACIFIC RISE; 3-DIMENSIONAL ANALYSIS; ISOSTATIC COMPENSATION; OCEANIC-CRUST; ACCRETION; THICKNESS; AXIS; FLOW; AGE AB A number of recent studies have used gravity data from mid-ocean ridges to infer along-axis crustal thickness variations, and hence variations in melt supply. A problem with these studies is that it is difficult to distinguish the effects of crustal thickness variations from those of crustal and mantle density variations. We analyze gravity data from the 12-13 km offset Blake Spur Fracture Zone in 140 Ma crust in the western North Atlantic. The advantage of studying this area is that mantle density variations are likely to be much smaller than those at the ridge axis, and crustal thickness variations are well constrained by expanding spread profiles (ESPs). Thus we andre able to separately quantify the contributions made to the gravity anomaly by crustal thickness and crustal density variations. After removal of the gravity effects of the seabed and the oceanic basement topography, as defined by a grid of multichannel seismic reflection profiles, the gravity data show a linear 5-mGal high along the fracture zone. After removal of the effects of crustal thickness variations defined by the ESPs, and of a basal high-velocity layer beneath the fracture zone interpreted to be partially serpentinized upper mantle, the data show a 5-mGal gravity low at the fracture zone. An alternative interpretation of the basal layer, as a thickened Moho transition zone, also leads to a residual gravity low. These results, together with other recent results from fracture zones on the Mid-Atlantic Ridge, suggest that crustal thickness variations at fracture zones may be consistently understimated by studies based on gravity data. The discrepancy may be explained by variations in crustal density due to enhanced fracturing in the vicinity of fracture zones, and to disproportionate thinning of oceanic layer 3 near segment boundaries. C1 WOODS HOLE OCEANOG INST, DEPT GEOL & GEOPHYS, WOODS HOLE, MA 02543 USA. NATL RENEWABLE ENERGY LAB, WASHINGTON, DC 20024 USA. RP MINSHULL, TA (reprint author), UNIV CAMBRIDGE, DEPT EARTH SCI, BULLARD LABS, MADINGLEY RD, CAMBRIDGE CB3 0EZ, ENGLAND. RI Minshull, Timothy/D-1147-2010 OI Minshull, Timothy/0000-0002-8202-1379 NR 33 TC 7 Z9 7 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9313 EI 2169-9356 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD SEP 10 PY 1995 VL 100 IS B9 BP 17771 EP 17779 DI 10.1029/95JB01692 PG 9 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA RU400 UT WOS:A1995RU40000014 ER PT J AU YOON, M MOCHRIE, SGJ ZEHNER, DM WATSON, GM GIBBS, D AF YOON, M MOCHRIE, SGJ ZEHNER, DM WATSON, GM GIBBS, D TI PERIODIC STEP-BUNCHING ON A MISCUT PT(111) SURFACE SO SURFACE SCIENCE LA English DT Article DE PLATINUM; STEPPED SINGLE CRYSTAL SURFACES; SURFACE RELAXATION AND RECONSTRUCTION; SURFACE STRUCTURE; X-RAY SCATTERING, DIFFRACTION, AND REFLECTION ID COMMENSURATE-INCOMMENSURATE TRANSITION; BROMINE-INTERCALATED GRAPHITE; SYNCHROTRON X-RAY; VICINAL SI(111); PHASE-SEPARATION; RECONSTRUCTION; MORPHOLOGY; STRESS; GOLD AB The temperature dependence of the equilibrium surface morphology of a stepped Pt(111) surface, miscut by 1.8 degrees towards [($) over bar 1 ($) over bar 12], has been studied by X-ray scattering techniques between 300 and 1900 K. Below T-c = 1389 K, the surface is found to be uniformly stepped and unreconstructed. Above T-c, the surface transforms into a periodic array of wide terraces and narrow terraces. Unlike macroscopic facets, the wide terraces are mesoscopic in extent, ranging from 230 Angstrom at 1389 K to 94 Angstrom at 1900 K. Reflectivity measurements suggest that multiple-height steps are not prevalent. The wave vector characterizing the array (delta) follows a power law versus reduced temperature [t = (T - T-c)/T-c]: delta = delta>(0)t(beta) with beta = 0.66 +/- 0.05. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP YOON, M (reprint author), MIT,DEPT PHYS,CAMBRIDGE,MA 02139, USA. NR 33 TC 29 Z9 29 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD SEP 10 PY 1995 VL 338 IS 1-3 BP 225 EP 235 DI 10.1016/0039-6028(95)00555-2 PG 11 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA RU492 UT WOS:A1995RU49200033 ER PT J AU CHEUNG, YS LI, WK NG, CY AF CHEUNG, YS LI, WK NG, CY TI A GAUSSIAN-2 AB-INITIO STUDY OF ISOMERIC CH3S2, CH3S2+ AND CH3S2- SO THEOCHEM-JOURNAL OF MOLECULAR STRUCTURE LA English DT Article ID VACUUM ULTRAVIOLET PHOTODISSOCIATION; ADIABATIC IONIZATION-ENERGY; PHOTOIONIZATION; CH3SSCH3; KINETICS; CATIONS; C2H5S+; CH2SH+; 298-K AB The energetics and structures for isomers of the CH3S2, CH3S2+, and CH3S2- systems have been studied with the ab initio Gaussian-2 (G2) method. At the MP2(full)/6-31G(d) level, there are five minima on the potential energy surface of CH3 S-2, corresponding to equilibrium structures CH3SS, CH2SHS, CH2SSH, HSCH2S and HSCHSH. At the same level of theory, CH3S2+ may exist as six isomers: CH3SS+, CH2SHS+, CH2SSH+, c-HSCH2S+, HSCHSH+ and CHSHSH+; CH3S2- may exist as four isomers: CH3SS-, CH2SHS-, HSCH2S- and HSCHSH-. The most stable CH3S2, CH3S2+ and CH3S2- species are CH3SS, HSCHSH+ and CH3SS-, respectively. Transition structures for the rearrangements of the neutral radicals and the cations are also located. The structures and energetics of all the species located are discussed. Also, the G2 standard molar enthalpies of formation and ionization energies of various species are in good agreement with the available experimental data. C1 CHINESE UNIV HONG KONG,DEPT CHEM,SHA TIN,HONG KONG. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 26 TC 15 Z9 15 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-1280 J9 THEOCHEM-J MOL STRUC JI Theochem-J. Mol. Struct. PD SEP 10 PY 1995 VL 339 BP 25 EP 38 PG 14 WC Chemistry, Physical SC Chemistry GA RU563 UT WOS:A1995RU56300003 ER PT J AU HARTLEY, KO GELL, D SMITH, GCM ZHANG, H DIVECHA, N CONNELLY, MA ADMON, A LEESMILLER, SP ANDERSON, CW JACKSON, SP AF HARTLEY, KO GELL, D SMITH, GCM ZHANG, H DIVECHA, N CONNELLY, MA ADMON, A LEESMILLER, SP ANDERSON, CW JACKSON, SP TI DNA-DEPENDENT PROTEIN-KINASE CATALYTIC SUBUNIT - A RELATIVE OF PHOSPHATIDYLINOSITOL 3-KINASE AND THE ATAXIA-TELANGIECTASIA GENE-PRODUCT SO CELL LA English DT Article ID SCHIZOSACCHAROMYCES-POMBE; KU-AUTOANTIGEN; PHOSPHORYLATION; ANTIGEN; REPAIR AB DNA-dependent protein kinase (DNA-PK), which is involved in DNA double-stranded break repair and V(D)J recombination, comprises a DNA-targeting component called Ku and an similar to 460 kDa catalytic subunit, DNA-PKcs. Here, we describe the cloning of the DNA-PKcs cDNA and show that DNA-PKcs falls into the phosphatidylinositol (PI) 3-kinase family. Biochemical assays, however, indicate that DNA-PK phosphorylates proteins but has no detectable activity toward lipids, Strikingly, DNA-PKcs is most similar to PI kinase family members involved in cell cycle control, DNA repair, and DNA damage responses. These include the FKBP12-rapamycin-binding proteins Tor1p, Tor2p, and FRAP, S. pombe rad3, and the product of the ataxia telangiectasia gene, mutations in which lead to genomic instability and predisposition to cancer. The relationship of these proteins to DNA-PKcs provides important clues to their mechanisms of action. C1 UNIV CAMBRIDGE,DEPT ZOOL,CAMBRIDGE CB2 1QR,ENGLAND. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. BABRAHAM INST,INOSITIDE LAB,CAMBRIDGE CB2 4AT,ENGLAND. TECHNION ISRAEL INST TECHNOL,IL-32000 HAIFA,ISRAEL. RP HARTLEY, KO (reprint author), UNIV CAMBRIDGE,WELCOME TRUST,CANC RES CAMPAIGN INST,TENNIS COURT RD,CAMBRIDGE CB2 1QR,ENGLAND. RI Dry, Kate/I-2328-2014 FU Wellcome Trust NR 34 TC 625 Z9 626 U1 1 U2 11 PU CELL PRESS PI CAMBRIDGE PA 50 CHURCH ST CIRCULATION DEPT, CAMBRIDGE, MA 02138 SN 0092-8674 J9 CELL JI Cell PD SEP 8 PY 1995 VL 82 IS 5 BP 849 EP 856 DI 10.1016/0092-8674(95)90482-4 PG 8 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA RU755 UT WOS:A1995RU75500020 PM 7671312 ER PT J AU KUMARAN, S SU, MC LIM, KP MICHAEL, JV AF KUMARAN, S SU, MC LIM, KP MICHAEL, JV TI THERMAL-DECOMPOSITION OF CF3I USING I-ATOM ABSORPTION SO CHEMICAL PHYSICS LETTERS LA English DT Article ID RATE CONSTANTS; SHOCK-TUBE; PHOTOLYSIS; FLASH; H-2 AB I-atom atomic resonance absorption spectrometry (ARAS) has been developed and applied to measure the thermal decomposition rate constant for CF3I (+ M) --> CF3 + I (+ M). The I-atom curve-of-growth (lambda = 183 nm.) was determined using this reaction, and, for [I] less than or equal to 3 X 10(12) molecules cm(-3), (ABS) = 1.9215 X 10(-13) [I], yielding (sigma = 1.933 X 10(-14) cm(2). Measured rate constants an be expressed by k(1) = 3.24 x 10(-9) exp(-17286 K/T) cm(3) molecule(-1) s(-1) (+/- 56%, 1033 less than or equal to T less than or equal to 1285 K). RRKM theory has been applied to rationalize this result. RP KUMARAN, S (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. RI Michael, Joe/E-3907-2010 NR 15 TC 24 Z9 24 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD SEP 8 PY 1995 VL 243 IS 1-2 BP 59 EP 63 DI 10.1016/0009-2614(95)00785-3 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RU666 UT WOS:A1995RU66600011 ER PT J AU SCHISCHMANOFF, PO WINARDI, R DISCHER, DE PARRA, MK BICKNESE, SE WITKOWSKA, HE CONBOY, JG MOHANDAS, N AF SCHISCHMANOFF, PO WINARDI, R DISCHER, DE PARRA, MK BICKNESE, SE WITKOWSKA, HE CONBOY, JG MOHANDAS, N TI DEFINING OF THE MINIMAL DOMAIN OF PROTEIN-4.1 INVOLVED IN SPECTRIN-ACTIN BINDING SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID HUMAN-ERYTHROCYTE SPECTRIN; GLUTATHIONE-S-TRANSFERASE; BETA-SPECTRIN; MEMBRANE SKELETON; ESCHERICHIA-COLI; PEPTIDE-FRAGMENTS; COMPLEX; PHOSPHORYLATION; ASSOCIATIONS; ISOFORMS AB The spectrin-actin-binding domain of protein 4.1 is encoded by a 21-amino acid alternative exon and a 59-amino acid constitutive exon, To characterize the minimal domain active for interactions with spectrin and actin, we functionally characterized recombinant 4.1 peptides containing the 21-amino acid cassette plus varying portions of the 59-amino acid cassette (designated 21.10 to 21.59). Peptide 21.43 was shown fully functional in binary interactions with spectrin (by cosedimentation and coimmunoprecipitation experiments) and in ternary complex formation with spectrin and actin (by an in vitro gelation assay), Further truncation produced peptides incapable of binary interactions but fully competent for ternary complex formation (peptides 21.36 and 21.31), shorter peptides with reduced ternary complex activity and altered kinetics (21.26 and 0.59), and inactive peptides (21.20 and 21.10), Binding studies and circular dichroism experiments suggested that residues 37-43 of the constitutive domain were directly involved in spectrin binding. These data indicate that 4.1-spectrin binary interaction requires the 21-amino acid alternative cassette plus the 43 N-terminal residues of the constitutive domain, Moreover, the existence of two possible ternary complex assembly pathways is suggested: one initiated by 4.1-spectrin interactions, and a second by 4.1-actin interactions, The latter may require a putative actin binding motif within the 26 N-terminal residues of the constitutive domain. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY & SAN FRANCISCO,JOINT GRAD GRP BIOENGN,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,CARDIOVASC RES INST,SAN FRANCISCO,CA 94143. CHILDRENS HOSP OAKLAND,RES INST,OAKLAND,CA 94609. FU NCRR NIH HHS [RR 06506-01]; NIDDK NIH HHS [DK 26263, DK 32094] NR 52 TC 55 Z9 55 U1 0 U2 1 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD SEP 8 PY 1995 VL 270 IS 36 BP 21243 EP 21250 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA RU054 UT WOS:A1995RU05400058 PM 7673158 ER PT J AU LLOR, A OLEJNICZAK, Z PINES, A AF LLOR, A OLEJNICZAK, Z PINES, A TI COHERENT ISOTROPIC AVERAGING IN ZERO-FIELD NUCLEAR-MAGNETIC-RESONANCE .1. GENERAL-THEORY AND ICOSAHEDRAL SEQUENCES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MULTIPLE-QUANTUM NMR; HIGH-RESOLUTION NMR; QUADRUPOLE-RESONANCE; PULSE EXCITATION; TIME-REVERSAL; SOLIDS; ANGLE; NQR; CONVERGENCE; COUPLINGS AB We present a general theory of coherent isotropic averaging in nuclear magnetic resonance (NMR). In a zero external field, magnetic-field pulses can selectively average the internal spin Hamiltonians, while preserving the intrinsic invariance of the spectrum with respect to the sample orientation. The theory predicts the limits of the scaling factors for tenser interactions of different ranks. Time reversal is found to be possible for first- and second-rank tensors with scaling factors of -1/3 and -1/4, respectively. Explicit sequences, based on icosahedral symmetry, are given for a number of optimal scaling factors. To illustrate the theory, an experiment is also presented in the special case of rank-selective decoupling. As in high-field NMR, applications can be expected from the introduction of coherent averaging schemes for zero-held techniques: for example, decouplings (by rank or nuclear species), time reversal, and multipolar experiments (zero-field analog of multiple-quantum NMR). (C) 1995 American Institute of Physics. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. NR 59 TC 10 Z9 10 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-9606 EI 1089-7690 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 8 PY 1995 VL 103 IS 10 BP 3966 EP 3981 DI 10.1063/1.469584 PG 16 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RU109 UT WOS:A1995RU10900011 ER PT J AU LLOR, A OLEJNICZAK, Z PINES, A AF LLOR, A OLEJNICZAK, Z PINES, A TI COHERENT ISOTROPIC AVERAGING IN ZERO-FIELD NUCLEAR-MAGNETIC-RESONANCE .2. CUBIC SEQUENCES AND TIME-REVERSAL OF SPIN COUPLINGS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MULTIPLE-QUANTUM NMR; HIGH-RESOLUTION NMR; SOLIDS; ANGLE; NQR AB We present a special case of the theory of coherent isotropic averaging in zero-field NMR, given in part I of this work. In a zero external field, combinations of the magnetic-field pulses restricted to pi/2 rotations along the three coordinate axes can selectively average internal spin Hamiltonians while preserving the intrinsic invariance of the spectrum with respect to the sample orientation. Compared with the general case, the limits of the allowed scaling factors of first- and second-rank interactions are slightly reduced. For instance, time reversal is possible for second-rank tensors with a -1/5 scaling factor, instead of -1/4 in general. Finite pulse compensations are analyzed and experimental illustrations are given for two optimum time-reversal sequences. The cubic sequences, though less efficient than the icosahedral sequences, are technically more feasible and may be used in zero-field experiments such as decoupling (by rank or nuclear species), time reversal or multipolar experiments (the zero-field equivalent of multiple-quantum NMR). (C) 1995 American Institute of Physics. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. NR 35 TC 9 Z9 9 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 8 PY 1995 VL 103 IS 10 BP 3982 EP 3997 DI 10.1063/1.469585 PG 16 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RU109 UT WOS:A1995RU10900012 ER PT J AU CHANG, J BROWN, NJ AF CHANG, J BROWN, NJ TI COMPARISON OF THE QUANTUM DYNAMICS AND SENSITIVITY ANALYSIS FOR DIFFERENT ISOTOPOMERS OF THE H+H-2 REACTION SO JOURNAL OF CHEMICAL PHYSICS LA English DT Review ID INTEGRAL CROSS-SECTIONS; POTENTIAL-ENERGY SURFACE; KOHN VARIATIONAL PRINCIPLE; ACCURATE 3-DIMENSIONAL PROBABILITIES; MECHANICAL REACTION PROBABILITIES; ARRANGEMENT CHANNEL APPROACH; STATE REACTION DYNAMICS; LOG DERIVATIVE VERSION; THERMAL RATE CONSTANTS; MANY-BODY EXPANSION AB A new formalism for quantum functional sensitivity analysis (QFSA) of atom-diatom reactions in the gas phase is developed within a version of Manolopoulos et al.'s [J. Chem. Phys. 93, 403 (1990)] log-derivative Kohn variational method containing contracted translational basis functions. A reference energy, E(mid), is introduced to define boundary translational functions which completely remove all scattering energy dependence from the basis functions. This greatly facilitates scattering calculations for a range of energies about E(mid) without having to recalculate any of the so-called ''stiffness'' matrix elements. Our new approach to QFSA is applied to study the sensitivity of the H+H-2, D+H-2, and H+D-2 reaction probabilities to the Boothroyd-Keogh-Martin-Peterson (BKMP) potential energy surface. The transition probability sensitivities of both D+H-2 and H+D-2 are very similar to those of H+H-2 at low energies, but at higher energies, the sensitivities of the H+D-2 reaction differ from those of the other two isotopomers. Isotopomers that have very similar reaction probability profiles also have very similar sensitivities to the potential. All three isotopomers exhibit a large region of positive sensitivity at the top of the barrier for an approximately 0.1 to 0.2 eV energy range above threshold. For these energies (similar to 0.3 to 0.5 eV above the barrier), it is possible to increase the reaction probability with slight increases in barrier height. Sensitivity results from our new code have also provided a wealth of information about (i) how small, localized changes in the potential affect product state distributions, resonance features, and reactivity; and (ii) where the dynamics is most sensitive to inaccuracies in the potential. Comparisons are also made of transition probabilities and sensitivities on the BKMP surface to those of other potential energy surfaces. (C) 1995 American Institute of Physics. RP CHANG, J (reprint author), UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV ENERGY & ENVIRONM, BERKELEY, CA 94720 USA. NR 119 TC 12 Z9 12 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 8 PY 1995 VL 103 IS 10 BP 4097 EP 4128 DI 10.1063/1.469596 PG 32 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RU109 UT WOS:A1995RU10900023 ER PT J AU STANTON, JF GAUSS, J ISHIKAWA, N HEADGORDON, M AF STANTON, JF GAUSS, J ISHIKAWA, N HEADGORDON, M TI A COMPARISON OF SINGLE REFERENCE METHODS FOR CHARACTERIZING STATIONARY-POINTS OF EXCITED-STATE POTENTIAL-ENERGY SURFACES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID COUPLED-CLUSTER METHOD; CONFIGURATION-INTERACTION CALCULATIONS; SIZE-EXTENSIVE MODIFICATION; MOLECULAR WAVE-FUNCTIONS; EXCITATION-ENERGIES; BENCHMARK CALCULATIONS; ABSORPTION-SPECTRUM; RESPONSE FUNCTIONS; QUANTUM-CHEMISTRY; DIATOMIC HYDRIDES AB The accuracy of geometries, vibrational frequencies and dipole moments of stationary points on excited state potential energy surfaces is assessed for three single reference excited state theories-configuration interaction (CIS), a perturbative doubles correlation correction to CIS, termed CIS(D), and equation-of-motion coupled cluster theory with single and double substitutions (EOM-CCSD). Two groups of systems are studied: the diatomic molecules H-2, BH, BE C-2, CO, and N-2; and the lowest singlet excited states of ammonia, formaldehyde and acetylene. The calculations demonstrate that CIS systematically underestimates bond lengths and overestimates frequencies and dipole moments, a pattern often associated with the Hartree-Fock method for ground states. CIS(D) fails to provide a systematic improvement to CIS for all geometries and frequencies, often overestimating correlation corrections. EOM-CCSD, by contrast, performs significantly better than CIS for all properties considered. (C) 1995 American Institute of Physics. C1 UNIV TEXAS,INST THEORET CHEM,DEPT BIOCHEM,AUSTIN,TX 78712. UNIV KARLSRUHE,INST PHYS CHEM,LEHRSTUHL THEORET CHEM,D-76128 KARLSRUHE,GERMANY. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP STANTON, JF (reprint author), UNIV TEXAS,INST THEORET CHEM,DEPT CHEM,AUSTIN,TX 78712, USA. NR 85 TC 160 Z9 163 U1 1 U2 14 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 8 PY 1995 VL 103 IS 10 BP 4160 EP 4174 DI 10.1063/1.469601 PG 15 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RU109 UT WOS:A1995RU10900028 ER PT J AU CURTISS, LA RAGHAVACHARI, K POPLE, JA AF CURTISS, LA RAGHAVACHARI, K POPLE, JA TI GAUSSIAN-2 THEORY - USE OF HIGHER-LEVEL CORRELATION METHODS, QUADRATIC CONFIGURATION-INTERACTION GEOMETRIES, AND 2ND-ORDER MOLLER-PLESSET ZERO-POINT ENERGIES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MOLECULAR-ENERGIES; ELECTRON CORRELATION; 2ND-ROW COMPOUNDS; BRUECKNER; 1ST-ROW AB The performance of Gaussian-2 theory is investigated when higher level theoretical methods are included for correlation effects, geometries, and zero-point energies. A higher level of correlation treatment is examined using Brueckner doubles [BD(T)] and coupled cluster [CCSD(T)] methods rather than quadratic configuration interaction [QCISD(T)]. The use of geometries optimized at the QCISD level rather than the second-order Moller-Plesset level (MP2) and the use of scaled MP2 zero-point energies rather than scaled Hartree-Fock (HF) zero-point energies have also been examined. The set of 125 energies used for validation of G2 theory [J. Chem. Phys, 94, 7221 (1991)] is used to test out these variations of G2 theory. Inclusion of higher levels of correlation treatment has little effect except in the cases of multiply-bonded systems. In these cases better agreement is obtained in some cases and poorer agreement in others so that there is no improvement in overall performance. The use of QCISD geometries yields significantly better agreement with experiment for several cases including the ionization potentials of CS and O-2, electron affinity of CN, and dissociation energies of N-2, O-2, CN, and SO2. This leads to a slightly better agreement with experiment overall. The MP2 zero-point energies gives no overall improvement. These methods may be useful for specific systems. (C) 1995 American Institute of Physics. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. AT&T BELL LABS,MURRAY HILL,NJ 07974. NORTHWESTERN UNIV,DEPT CHEM,EVANSTON,IL 60208. RP CURTISS, LA (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 27 TC 138 Z9 138 U1 1 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 8 PY 1995 VL 103 IS 10 BP 4192 EP 4200 DI 10.1063/1.470658 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RU109 UT WOS:A1995RU10900030 ER PT J AU WU, HB DESAI, SR WANG, LS AF WU, HB DESAI, SR WANG, LS TI 2 ISOMERS OF CUO2 - THE CU(O-2) COMPLEX AND THE COPPER DIOXIDE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Note ID ELECTRON-SPIN-RESONANCE; PHOTOELECTRON-SPECTROSCOPY; DIOXYGEN COMPLEXES; MOLECULAR-OXYGEN; METAL ATOMS; GAS-PHASE; MATRICES; OXIDES AB Photoelectron spectroscopy of CuO2- has been studied at three detachment wavelengths: 532 nm, 355 nm, and 266 nm. Vibrationally resolved spectra for two distinct isomers are observed: the Cu(O-2) complex and the copper dioxide molecule. The Cu(O)(2) complex has an electron affinity (EA) of 1.503(10) eV with a ground state vibrational frequency of 530 (50) cm(-1). Its first electronic excited state is 7400 (300) cm(-1) above the ground state. The Cu(O-2)(-) anion is also observed to undergo photodissociation to Cu-+O-2 at both 532 nm and 355 nm detachment wavelengths. The copper dioxide molecule is found to have a high EA of 3.46 (4) eV. Three low-lying excited states are observed within 1 eV above the ground state. The first two excited states of the copper dioxide molecule both possess a totally symmetric vibrational frequency of 640 (60) cm(-1). (C) 1995 American Institute of Physics. C1 WASHINGTON STATE UNIV, DEPT PHYS, RICHLAND, WA 99352 USA. PACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, RICHLAND, WA 99352 USA. NR 23 TC 57 Z9 57 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 8 PY 1995 VL 103 IS 10 BP 4363 EP 4366 DI 10.1063/1.470676 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RU109 UT WOS:A1995RU10900049 ER PT J AU LEE, JW CHAN, M LAW, TV KWON, HJ JAP, BK AF LEE, JW CHAN, M LAW, TV KWON, HJ JAP, BK TI PRELIMINARY CRYOCRYSTALLOGRAPHIC STUDY OF THE MITOCHONDRIAL CYTOCHROME BC(1) COMPLEX - IMPROVED CRYSTALLIZATION AND FLASH-COOLING OF A LARGE MEMBRANE-PROTEIN SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Note DE CRYOCRYSTALLOGRAPHY; CYTOCHROME BC(1) COMPLEX; MEMBRANE PROTEIN; FLASH-COOLING; CRYSTALLIZATION ID AMINO-ACID-SEQUENCE; BEEF-HEART UBIQUINOL; C-REDUCTASE; BINDING-PROTEIN; CRYSTALS; CRYSTALLOGRAPHY; SUBUNIT AB Ubiquinol-cytochrome c reductase is a crucial integral membrane protein in the mitochondrial respiratory cycle. Eleven subunits containing three cytochrome heme groups and a 2Fe-2S Rieske center make up this 240 kDa enzyme complex. Previously, many different crystal forms of the bc(1) complex have displayed diffraction to as far as 4.5 Angstrom. However, rapid degradation of the protein in the X-ray beam at room temperature has obstructed the collection of a full data set from a single crystal. As slight heterogeneities between crystals severely hampered merging of data from different crystals, we sought a method to stabilize the protein crystal in the X-ray beam in order to collect a full data set from one crystal sample. To this end, water soluble protein crystals are frequently flash-cooled to cryogenic temperatures; however, there is no report of cryocrystallography for membrane proteins. In this communication, we report on a successful experiment in which flash-cooled bc(1) membrane protein crystals have given rise to sustained diffraction over a 60 hour data collection period at a synchrotron source. Furthermore, we present an improved purification and crystallization protocol yielding crystals readily diffracting out to 3.3 Angstrom. These results should greatly aid in the future realization of the molecular structure of the bc(1) complex as well as other membrane proteins. (C) 1995 Academic Press Limited C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. FU NIGMS NIH HHS [GM51487] NR 30 TC 16 Z9 17 U1 0 U2 0 PU ACADEMIC PRESS (LONDON) LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD SEP 8 PY 1995 VL 252 IS 1 BP 15 EP 19 DI 10.1006/jmbi.1994.0470 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA RT965 UT WOS:A1995RT96500003 PM 7666427 ER PT J AU ALBER, MS CAMASSA, R HOLM, DD MARSDEN, JE AF ALBER, MS CAMASSA, R HOLM, DD MARSDEN, JE TI ON THE LINK BETWEEN UMBILIC GEODESICS AND SOLITON-SOLUTIONS OF NONLINEAR PDES SO PROCEEDINGS OF THE ROYAL SOCIETY-MATHEMATICAL AND PHYSICAL SCIENCES LA English DT Article ID HAMILTONIAN-FORMALISM; EQUATION AB In this paper we describe a new class of soliton solutions; called umbilic solitons, for certain nonlinear integrable PDEs. These umbilic solitons have the property that as the space variable x tends to infinity, the solution tends to a periodic wave, and as x tends to minus infinity, it tends to a phase shifted wave of the same shape. The equations admitting solutions in this new class include the Dym equation and equations in its hierarchy. The methods used to find and analyse these solutions are those of algebraic and complex geometry. We look for classes of solutions by constructing associated finite-dimensional integrable Hamiltonian systems on Riemann surfaces. In particular, in this setting we use geodesics on n-dimensional quadrics to find the spatial, or x-flow, which, together with the commuting t-flow given by the equation itself, defines new classes of solutions. Amongst these geodesics, particularly interesting ones are the umbilic geodesics, which then generate the class of umbilic soliton solutions. This same setting also enables us to introduce another class of solutions of Dym-like equations, which are related to elliptic and umbilic billiards. C1 UNIV NOTRE DAME, DEPT MATH, NOTRE DAME, IN 46556 USA. LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. CALTECH, PASADENA, CA 91125 USA. RP ALBER, MS (reprint author), MATH SCI RES INST, 1000 CENTENNIAL DR, BERKELEY, CA 94720 USA. NR 26 TC 43 Z9 44 U1 1 U2 1 PU ROYAL SOC PI LONDON PA 6-9 CARLTON HOUSE TERRACE, LONDON SW1Y 5AG, ENGLAND SN 0962-8444 J9 P R SOC-MATH PHYS SC JI P. Roy. Soc.-Math. Phys. Sci. PD SEP 8 PY 1995 VL 450 IS 1940 BP 677 EP 692 DI 10.1098/rspa.1995.0107 PG 16 GA RW666 UT WOS:A1995RW66600012 ER PT J AU ALTSCHULER, EL LADES, M AF ALTSCHULER, EL LADES, M TI POSSIBLE EXCEPTIONS TO RULES FOR ALPHA-HELIX TERMINATION BY GLYCINE SO SCIENCE LA English DT Article RP ALTSCHULER, EL (reprint author), LAWRENCE LIVERMORE NATL LAB,INST SCI COMP RES,POB 5508,LIVERMORE,CA 94551, USA. OI Aurora, Rajeev/0000-0002-6609-6055 NR 4 TC 0 Z9 0 U1 0 U2 2 PU AMER ASSOC ADVAN SCIENCE PI WASHINGTON PA 1333 H ST NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD SEP 8 PY 1995 VL 269 IS 5229 BP 1451 EP 1451 DI 10.1126/science.7660132 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA RT806 UT WOS:A1995RT80600054 PM 7660132 ER PT J AU SLATKIN, DN AF SLATKIN, DN TI BIODISTRIBUTION AND TOXICITY OF 2,4-DIVINYL-NIDO-O-CARBORANYLDEUTEROPORPHYRIN-IX IN MICE (VOL 43, PG 467, 1992) SO BIOCHEMICAL PHARMACOLOGY LA English DT Correction, Addition RP SLATKIN, DN (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. NR 1 TC 2 Z9 2 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0006-2952 J9 BIOCHEM PHARMACOL JI Biochem. Pharmacol. PD SEP 7 PY 1995 VL 50 IS 6 BP 893 EP 894 PG 2 WC Pharmacology & Pharmacy SC Pharmacology & Pharmacy GA RW999 UT WOS:A1995RW99900023 ER PT J AU COCKBURN, B JONES, DA TITI, ES AF COCKBURN, B JONES, DA TITI, ES TI DETERMINING DEGREES OF FREEDOM FOR NONLINEAR DISSIPATIVE EQUATIONS SO COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE I-MATHEMATIQUE LA English DT Article ID NAVIER-STOKES EQUATIONS; INERTIAL MANIFOLDS; DIMENSION; ATTRACTORS AB A finite set of linear functionals {l(i)}(N)(i=1) is said to be a set of determining degrees of freedom for a given PDE if when any two solutions of the PDE, u(1) and u(2), are such that (l(i) (u(1) (t) - u(2) (t)) converges to 0 as time t goes to infinity, 1 less than or equal to i less than or equal to N, then the solutions converge to each other as time goes to infinity. In this paper, we prove the existence of a large class of sets of determining degrees of freedom, with special attention to the standard sets of degrees of freedom used in the finite element method, for the Navier-Stokes equations; and provide an estimate on the size of the sets. We then extend and sharpen this result to general nonlinear dissipative evolution equation possessing an inertial manifold. C1 LOS ALAMOS NATL LAB,IGPP,LOS ALAMOS,NM 87544. UNIV CALIF IRVINE,DEPT MATH,IRVINE,CA 92717. UNIV CALIF IRVINE,DEPT AEROSP & MECH ENGN,IRVINE,CA 92717. RP COCKBURN, B (reprint author), UNIV MINNESOTA,SCH MATH,MINNEAPOLIS,MN 55455, USA. RI Cockburn, Bernardo/M-9617-2013 OI Cockburn, Bernardo/0000-0001-6085-3441 NR 21 TC 19 Z9 19 U1 0 U2 3 PU GAUTHIER-VILLARS PI MONTROUGE PA DEPT UNIV PROFESSIONNEL REVUES SCIENTIFIQUES TECHNIQUE 11 RUE GOSSIN, F-92543 MONTROUGE, FRANCE SN 0764-4442 J9 CR ACAD SCI I-MATH JI Comptes Rendus Acad. Sci. Ser. I-Math. PD SEP 7 PY 1995 VL 321 IS 5 BP 563 EP 568 PG 6 WC Mathematics SC Mathematics GA RW637 UT WOS:A1995RW63700011 ER PT J AU GAI, HD DANG, LX SCHENTER, GK GARRETT, BC AF GAI, HD DANG, LX SCHENTER, GK GARRETT, BC TI QUANTUM SIMULATION OF AQUEOUS IONIC CLUSTERS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID WATER CLUSTERS; ELECTRON AB Classical and quantum (Path Integral Monte Carlo) simulations are performed at several temperatures (i.e., 100, 200, and 300 K) on the ionic clusters Cl-(H2O)(n), n 1-6 to determine the importance of quantum effects on nuclear motion. The polarizable water and ion-water potential models are used to describe water-water and ion-water interactions. Comparison of classical and quantum binding enthalpies. indicate that the quantum effect is significant at lower temperature (i.e., at 100 K); the difference can amount up to 20% of the total energy. The calculated quantum radial distribution functions, due to delocalization of quantum nuclei, are less structured and slightly shifted outward compared to the corresponding classical description. C1 PACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, RICHLAND, WA 99352 USA. RI Garrett, Bruce/F-8516-2011; Schenter, Gregory/I-7655-2014 OI Schenter, Gregory/0000-0001-5444-5484 NR 20 TC 29 Z9 29 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD SEP 7 PY 1995 VL 99 IS 36 BP 13303 EP 13306 DI 10.1021/j100036a001 PG 4 WC Chemistry, Physical SC Chemistry GA RU476 UT WOS:A1995RU47600001 ER PT J AU DARWIN, DC MOORE, CB AF DARWIN, DC MOORE, CB TI REACTION-RATE CONSTANTS (295 K) FOR (CH2)-C-3 WITH H2S, SO2, AND NO2 - UPPER-BOUNDS FOR RATE CONSTANTS WITH LESS REACTIVE PARTNERS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID CH2(X3B1); KINETICS; HYDROCARBONS; METHYLENE; REMOVAL AB Direct measurements have been made of the reactive removal rate of tripler methylene with H2S, SO2, and NO2, yielding values for the rate constants of (2.0 +/- 0.3) x 10(-12), (4.9 +/- 0.6) x 10(-12), and (6.9 +/- 1.5) x 10(-11) cm(3) molecule(-1) s(-1), respectively. H-2, CO, CO2, N2O, CH3Cl, (CH3)(2)CO, and C6H6 were found to have rate constants less than similar to 10(-14) cm(3) molecule(-1) s(-1). C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. NR 25 TC 24 Z9 24 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD SEP 7 PY 1995 VL 99 IS 36 BP 13467 EP 13470 DI 10.1021/j100036a022 PG 4 WC Chemistry, Physical SC Chemistry GA RU476 UT WOS:A1995RU47600022 ER PT J AU RABEONY, M PEIFFER, DG BEHAL, SK DISKO, M DOZIER, WD THIYAGARAJAN, P LIN, MY AF RABEONY, M PEIFFER, DG BEHAL, SK DISKO, M DOZIER, WD THIYAGARAJAN, P LIN, MY TI SELF-ORGANIZATION OF GRAFT-COPOLYMERS AT SURFACES, INTERFACES AND IN BULK SO JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS LA English DT Article ID DIBLOCK COPOLYMERS; BLOCK COPOLYMERS; POLYMERS; POLYSTYRENE; MORPHOLOGY; SCATTERING; BLENDS AB The morphology in bulk and thin film of high-integrity graft copolymers has been investigated by small-angle neutron and light scattering, neutron reflectity and transmission electron microscopy. The model graft copolymers are based on two chemically incompatible blocks composed of an elastomeric poly(ethyl acrylate) (PEA) backbone onto which pendant monodisperse thermoplastic polystyrene (PS) are statistically placed. Two different levels of graft corresponding to an average of one and three per chain were investigated. In the bulk phase, the low graft-level shows irregular fractal-like structures while the high graft-level exhibits lamellar microdomains. In thin film, ordered structures were observed also in both compositions. The interphase adhesion between the PS and the PEA microdomain was investigated by elongating the copolymer films uniaxially. The low graft-level material exhibits normal behaviour characteristic of filler-reinforced rubber: the isotropic scattering pattern deforms in an anisotropic manner, i.e. ellipsoid-shaped with the long axis perpendicular to the stretching direction. An 'abnormal butterfly' pattern was observed with the high graft-level. The butterfly pattern is attributed to the deformation of the lamellar morphology of the copolymer. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. NIST,DIV REACTOR RADIAT,GAITHERSBURG,MD 20899. RP RABEONY, M (reprint author), EXXON RES & ENGN CO,ROUTE 22 E,ANNANDALE,NJ 08801, USA. NR 24 TC 5 Z9 5 U1 0 U2 0 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0956-5000 J9 J CHEM SOC FARADAY T JI J. Chem. Soc.-Faraday Trans. PD SEP 7 PY 1995 VL 91 IS 17 BP 2855 EP 2861 DI 10.1039/ft9959102855 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RT009 UT WOS:A1995RT00900024 ER PT J AU NEAFSEY, PJ LOWRIE, WB CROSS, FT AF NEAFSEY, PJ LOWRIE, WB CROSS, FT TI A MORTALITY KINETICS APPROACH TO CHARACTERIZING THE FRACTIONATED EXPOSURE-MORTALITY RESPONSE RELATIONSHIP OF RADON PROGENY SO MECHANISMS OF AGEING AND DEVELOPMENT LA English DT Article DE DOSE-RESPONSE; GOMPERTZ; HAZARD FUNCTIONS; MORTALITY; RADON-PROGENY ID GOMPERTZIAN SURVIVAL DYNAMICS; SPRAGUE-DAWLEY RATS; FISSION NEUTRONS; GAMMA-RAYS; RATE MODEL; MATHEMATICAL-MODEL; SYSTEMS; RETURN; CELLS; TIME AB The utility of mortality kinetics analysis in evaluating mortality data from fractionated exposure studies was demonstrated using radon-progeny induced extra mortality as an example. Gompertz (log-hazard) functions were used to characterize the mortality of male SPF Wistar rats exposed to radon progeny at 100 WL and 1000 WL for total exposures ranging from 20 to 10 240 WLM. There was an upward parallel displacement of the Gompertz functions following the period of radon exposure. The shape of the Gompertz functions for the exposed animals was consistent with a Gompertz model of toxicity resulting from short-term exposure, resulting in non-repaired injury that summates with natural (aging) injury. The parallel upward displacements (epsilon(ss)) of the Gompertz functions showed an unexpected non-monotonic pattern for rats exposed at 1000 WL. The parallel upward displacements showed a sharp upward increase from 320 to 640 WLM, fell at 1280 WLM, and thereafter increased linearly to 10 240 WLM. These data suggest that the radon progeny exposure-mortality response is non-linear. In contrast, there was no significant parallel upward displacement of the Gompertz functions for rats exposed at 100 WL for total exposures of 20-1280 WLM, but a large displacement began at 2560 WLM total exposure. C1 UNIV CONNECTICUT, DEPT MATH, STORRS, CT 06269 USA. PACIFIC NW LAB, DEPT BIOL & CHEM, RICHLAND, WA 99352 USA. RP NEAFSEY, PJ (reprint author), UNIV CONNECTICUT, SCH NURSING, BOX U-59, STORRS, CT 06269 USA. NR 63 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCI PUBL IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0047-6374 J9 MECH AGEING DEV JI Mech. Ageing. Dev. PD SEP 7 PY 1995 VL 83 IS 2 BP 65 EP 85 DI 10.1016/0047-6374(95)01606-Z PG 21 WC Cell Biology; Geriatrics & Gerontology SC Cell Biology; Geriatrics & Gerontology GA RY756 UT WOS:A1995RY75600001 PM 8569287 ER PT J AU ZHU, SJ LU, QH HAMILTON, JH RAMAYYA, AV PEKER, LK WANG, MG MA, WC BABU, BRS GINTER, TN KORMICKI, J SHI, D DENG, JK NAZAREWICZ, W RASMUSSEN, JO STOYER, MA CHU, SY GREGORICH, KE MOHAR, MF ASZTALOS, S PRUSSIN, SG COLE, JD ARYAEINEJAD, R DARDENNE, YK DRIGERT, M MOODY, KJ LOUGHED, RW WILD, JF JOHNSON, NR LEE, IY MCGOWAN, FK TERAKOPIAN, GM OGANESSIAN, YT AF ZHU, SJ LU, QH HAMILTON, JH RAMAYYA, AV PEKER, LK WANG, MG MA, WC BABU, BRS GINTER, TN KORMICKI, J SHI, D DENG, JK NAZAREWICZ, W RASMUSSEN, JO STOYER, MA CHU, SY GREGORICH, KE MOHAR, MF ASZTALOS, S PRUSSIN, SG COLE, JD ARYAEINEJAD, R DARDENNE, YK DRIGERT, M MOODY, KJ LOUGHED, RW WILD, JF JOHNSON, NR LEE, IY MCGOWAN, FK TERAKOPIAN, GM OGANESSIAN, YT TI OCTUPOLE DEFORMATION IN BA-142,BA-143 AND CE-144 - NEW BAND STRUCTURES IN NEUTRON-RICH BA-ISOTOPES SO PHYSICS LETTERS B LA English DT Article ID DEFORMED-NUCLEI; BARIUM ISOTOPES; GROUND-STATE; REGION; SHAPES; INSTABILITY; ENERGY; BA-145; MODES; MASS AB New, high spin band structures are established for the neutron-rich nuclei Ba-142,Ba-143,Ba-145,Ba-147, and Ce-144, and levels of Ba-144,Ba-146 extended to higher spins from the study of gamma-gamma and gamma-gamma-gamma coincidence studies in spontaneous fission. Alternating parity sequences connected by strong electric dipole transitions are identified in Ba-142,Ba-143 and Ce-144 but not in Ba-145,Ba-147 to confirm theoretical predictions of stable octupole deformation for N = 86. C1 VANDERBILT UNIV,DEPT PHYS,NASHVILLE,TN 37235. JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83412. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. JOINT INST NUCL RES DUBNA,FLEROV LAB HEAVY ION REACT,DUBNA,RUSSIA. ORISE,UNISOR,OAK RIDGE,TN 37832. RP ZHU, SJ (reprint author), TSING HUA UNIV,DEPT PHYS,BEIJING 100084,PEOPLES R CHINA. NR 28 TC 89 Z9 98 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD SEP 7 PY 1995 VL 357 IS 3 BP 273 EP 280 DI 10.1016/0370-2693(95)00900-6 PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA RU597 UT WOS:A1995RU59700002 ER PT J AU CRISTANCHO, F LAFOSSE, DR BAKTASH, C WINCHELL, DF CEDERWALL, B DORING, J GROSS, CJ HUA, PF JIN, HQ KOROLIJA, M LANDULFO, E LEE, IY MACCHIAVELLI, AO MAIER, MR RATHBUN, W SALADIN, JX SARANTITES, D STRACENER, DW TABOR, SL VANDERMOLLEN, A WERNER, TR AF CRISTANCHO, F LAFOSSE, DR BAKTASH, C WINCHELL, DF CEDERWALL, B DORING, J GROSS, CJ HUA, PF JIN, HQ KOROLIJA, M LANDULFO, E LEE, IY MACCHIAVELLI, AO MAIER, MR RATHBUN, W SALADIN, JX SARANTITES, D STRACENER, DW TABOR, SL VANDERMOLLEN, A WERNER, TR TI MULTIPLE SUPERDEFORMED BANDS IN SR-81 SO PHYSICS LETTERS B LA English DT Article DE FUSION-EVAPORATION; SUPERDEFORMATION; BANDCROSSING; MOMENTS OF INERTIA; DEFORMATION; CRANKED SHELL MODEL CALCULATIONS; CONFIGURATIONS ID NUCLEI; LINE AB Four superdeformed bands extending over five to twelve transitions have been identified in Sr-81 from a study With the Gammasphere array and the Microball charged-particle array, One of the bands shows an upbend in the dynamic moment of inertia at a rotational frequency of 1.2 MeV and all bands exhibit a nearly constant moment of inertia below that frequency. C1 WASHINGTON UNIV,DEPT CHEM,ST LOUIS,MO 63130. OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306. RUTGERS STATE UNIV,DEPT PHYS,RUTGERS,NJ 08855. MICHIGAN STATE UNIV,NATL SUPERCONDUCTING CYCLOTRON LAB,E LANSING,MI 48824. JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996. UNIV WARSAW,INST THEORET PHYS,PL-00681 WARSAW,POLAND. RP CRISTANCHO, F (reprint author), UNIV PITTSBURGH,DEPT PHYS & ASTRON,PITTSBURGH,PA 15260, USA. RI Landulfo, Eduardo/B-7979-2012; Cederwall, Bo/M-3337-2014 OI Landulfo, Eduardo/0000-0002-9691-5306; Cederwall, Bo/0000-0003-1771-2656 NR 26 TC 20 Z9 20 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD SEP 7 PY 1995 VL 357 IS 3 BP 281 EP 286 DI 10.1016/0370-2693(95)00918-B PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA RU597 UT WOS:A1995RU59700003 ER PT J AU ABACHI, S ABBOTT, B ABOLINS, M ACHARYA, BS ADAM, I ADAMS, DL ADAMS, M AHN, S AIHARA, H ALITTI, J ALVAREZ, G ALVES, GA AMIDI, E AMOS, N ANDERSON, EW ARONSON, SH ASTUR, R AVERY, RE BADEN, A BALAMURALI, V BALDERSTON, J BALDIN, B BANTLY, J BARTLETT, JF BAZIZI, K BENDICH, J BERI, SB BERTRAM, I BEZZUBOV, VA BHAT, PC BHATNAGAR, V BHATTACHARJEE, M BISCHOFF, A BISWAS, N BLAZEY, G BLESSING, S BLOOM, P BOEHNLEIN, A BOJKO, NI BORCHERDING, F BORDERS, J BOSWELL, C BRANDT, A BROCK, R BROSS, A BUCHHOLZ, D BURTOVOI, VS BUTLER, JM CASEY, D CASTILLAVALDEZ, H CHAKRABORTY, D CHANG, SM CHEKULAEV, SV CHEN, LP CHEN, W CHEVALIER, L CHOPRA, S CHOUDHARY, BC CHRISTENSON, JH CHUNG, M CLAES, D CLARK, AR COBAU, WG COCHRAN, J COOPER, WE CRETSINGER, C CULLENVIDAL, D CUMMINGS, MAC CUTTS, D DAHL, OI DE, K DEMARTEAU, M DEMINA, R DENISENKO, K DENISENKO, N DENISOV, D DENISOV, SP DHARMARATNA, W DIEHL, HT DIESBURG, M DILORETO, G DIXON, R DRAPER, P DRINKARD, J DUCROS, Y DUGAD, SR DURSTONJOHNSON, S EDMUNDS, D ELLISON, J ELVIRA, VD ENGELMANN, R ENO, S EPPLEY, G ERMOLOV, P EROSHIN, OV EVDOKIMOV, VN FAHEY, S FAHLAND, T FATYGA, M FATYGA, MK FEATHERLY, J FEHER, S FEIN, D FERBEL, T FINOCCHIARO, G FISK, HE FISYAK, Y FLATTUM, E FORDEN, GE FORTNER, M FRAME, KC FRANZINI, P FUESS, S GALJAEV, AN GALLAS, E GAO, CS GAO, S GELD, TL GENIK, RJ GENSER, K GERBER, CE GIBBARD, B GLEBOV, V GLENN, S GOBBI, B GOFORTH, M GOLDSCHMIDT, A GOMEZ, B GONCHAROV, PI GORDON, H GOSS, LT GRAF, N GRANNIS, PD GREEN, DR GREEN, J GREENLEE, H GRIFFIN, G GROSSMAN, N GRUDBERG, P GRUNENDAHL, S GU, W GUGLIELMO, G GUIDA, JA GUIDA, JM GURYN, W GURZHIEV, SN GUTIERREZ, P GUTNIKOV, YE HADLEY, NJ HAGGERTY, H HAGOPIAN, S HAGOPIAN, V HAHN, KS HALL, RE HANSEN, S HATCHER, R HAUPTMAN, JM HEDIN, D HEINSON, AP HEINTZ, U HERNANDEZMONTOYA, R HEURING, T HIROSKY, R HOBBS, JD HOENEISEN, B HOFTUN, JS HSIEH, F HU, T HU, T HUEHN, T IGARASHI, S ITO, AS JAMES, E JAQUES, J JERGER, SA JIANG, JZY JOFFEMINOR, T JOHARI, H JOHNS, K JOHNSON, M JOHNSTAD, H JONCKHEERE, A JONES, M JOSTLEIN, H JUN, SY JUNG, CK KAHN, S KALBFLEISCH, G KANG, JS KEHOE, R KELLY, ML KERNAN, A KERTH, L KIM, CL KIM, SK KLATCHKO, A KLIMA, B KLOCHKOV, BI KLOPFENSTEIN, C KLYUKHIN, VI KOCHETKOV, VI KOHLI, JM KOLTICK, D KOSTRITSKIY, AV KOTCHER, J KOURLAS, J KOZELOV, AV KOZLOVSKI, EA KRISHNASWAMY, MR KRZYWDZINSKI, S KUNORI, S LAMI, S LANDSBERG, G LANOU, RE LEBRAT, JF LEFLAT, A LI, H LI, J LI, YK LIDEMARTEAU, QZ LIMA, JGR LINCOLN, D LINN, SL LINNEMANN, J LIPTON, R LIU, YC LOBKOWICZ, F LOKEN, SC LOKOS, S LUEKING, L LYON, AL MACIEL, AKA MADARAS, RJ MADDEN, R MANDRICHENKO, IV MANGEOT, P MANI, S MANSOULIE, B MAO, HS MARGULIES, S MARKELOFF, R MARKOSKY, L MARSHALL, T MARTIN, MI MARX, M MAY, B MAYOROV, AA MCCARTHY, R MCKIBBEN, T MCKINLEY, J MCMAHON, T MELANSON, HL NETO, JRTDM MERRITT, KW MIETTINEN, H MILDER, A MINCER, A DEMIRANDA, JM MISHRA, CS MOHAMMADIBAARMAND, M MOKHOV, N MONDAL, NK MONTGOMERY, HE MOONEY, P MUDAN, M MURPHY, C MURPHY, CT NANG, F NARAIN, M NARASIMHAM, VS NARAYANAN, A NEAL, HA NEGRET, JP NEIS, E NEMETHY, P NESIC, D NORMAN, D OESCH, L OGURI, V OLTMAN, E OSHIMA, N OWEN, D PADLEY, P PANG, M PARA, A PARK, CH PARK, YM PARTRIDGE, R PARUA, N PATERNO, M PERKINS, J PERYSHKIN, A PETERS, M PIEKARZ, H PISCHALNIKOV, Y PLUQUET, A PODSTAVKOV, VM POPE, BG PROSPER, HB PROTOPOPESCU, S PUSELJIC, D QIAN, J QUINTAS, PZ RAJA, R RAJAGOPALAN, S RAMIREZ, O RAO, MVS RAPIDIS, PA RASMUSSEN, L READ, AL REUCROFT, S RIJSSENBEEK, M ROCKWELL, T ROE, NA RUBINOV, P RUCHTI, R RUSIN, S RUTHERFOORD, J SANTORO, A SAWYER, L SCHAMBERGER, RD SCHELLMAN, H SCULLI, J SHABALINA, E SHAFFER, C SHANKAR, HC SHIVPURI, RK SHUPE, M SINGH, JB SIROTENKO, V SMART, W SMITH, A SMITH, RP SNIHUR, R SNOW, GR SNYDER, S SOLOMON, J SOOD, PM SOSEBEE, M SOUZA, M SPADAFORA, AL STEPHENS, RW STEVENSON, ML STEWART, D STOIANOVA, DA STOKER, D STREETS, K STROVINK, M TAKETANI, A TAMBURELLO, P TARAZI, J TARTAGLIA, M TAYLOR, TL TEIGER, J THOMPSON, J TRIPPE, TG TUTS, PM VARELAS, N VARNES, EW VIRADOR, PRG VITITOE, D VOLKOV, AA VOROBIEV, AP WAHL, HD WANG, G WANG, J WANG, LZ WARCHOL, J WAYNE, M WEERTS, H WEN, F WENZEL, WA WHITE, A WHITE, JT WIGHTMAN, JA WILCOX, J WILLIS, S WIMPENNY, SJ WIRJAWAN, JVD WOMERSLEY, J WON, E WOOD, DR XU, H YAMADA, R YAMIN, P YANAGISAWA, C YANG, J YASUDA, T YOSHIKAWA, C YOUSSEF, S YU, J YU, Y ZHANG, Y ZHOU, YH ZHU, Q ZHU, YS ZHU, ZH ZIEMINSKA, D ZIEMINSKI, A ZYLBERSTEJN, A AF ABACHI, S ABBOTT, B ABOLINS, M ACHARYA, BS ADAM, I ADAMS, DL ADAMS, M AHN, S AIHARA, H ALITTI, J ALVAREZ, G ALVES, GA AMIDI, E AMOS, N ANDERSON, EW ARONSON, SH ASTUR, R AVERY, RE BADEN, A BALAMURALI, V BALDERSTON, J BALDIN, B BANTLY, J BARTLETT, JF BAZIZI, K BENDICH, J BERI, SB BERTRAM, I BEZZUBOV, VA BHAT, PC BHATNAGAR, V BHATTACHARJEE, M BISCHOFF, A BISWAS, N BLAZEY, G BLESSING, S BLOOM, P BOEHNLEIN, A BOJKO, NI BORCHERDING, F BORDERS, J BOSWELL, C BRANDT, A BROCK, R BROSS, A BUCHHOLZ, D BURTOVOI, VS BUTLER, JM CASEY, D CASTILLAVALDEZ, H CHAKRABORTY, D CHANG, SM CHEKULAEV, SV CHEN, LP CHEN, W CHEVALIER, L CHOPRA, S CHOUDHARY, BC CHRISTENSON, JH CHUNG, M CLAES, D CLARK, AR COBAU, WG COCHRAN, J COOPER, WE CRETSINGER, C CULLENVIDAL, D CUMMINGS, MAC CUTTS, D DAHL, OI DE, K DEMARTEAU, M DEMINA, R DENISENKO, K DENISENKO, N DENISOV, D DENISOV, SP DHARMARATNA, W DIEHL, HT DIESBURG, M DILORETO, G DIXON, R DRAPER, P DRINKARD, J DUCROS, Y DUGAD, SR DURSTONJOHNSON, S EDMUNDS, D ELLISON, J ELVIRA, VD ENGELMANN, R ENO, S EPPLEY, G ERMOLOV, P EROSHIN, OV EVDOKIMOV, VN FAHEY, S FAHLAND, T FATYGA, M FATYGA, MK FEATHERLY, J FEHER, S FEIN, D FERBEL, T FINOCCHIARO, G FISK, HE FISYAK, Y FLATTUM, E FORDEN, GE FORTNER, M FRAME, KC FRANZINI, P FUESS, S GALJAEV, AN GALLAS, E GAO, CS GAO, S GELD, TL GENIK, RJ GENSER, K GERBER, CE GIBBARD, B GLEBOV, V GLENN, S GOBBI, B GOFORTH, M GOLDSCHMIDT, A GOMEZ, B GONCHAROV, PI GORDON, H GOSS, LT GRAF, N GRANNIS, PD GREEN, DR GREEN, J GREENLEE, H GRIFFIN, G GROSSMAN, N GRUDBERG, P GRUNENDAHL, S GU, W GUGLIELMO, G GUIDA, JA GUIDA, JM GURYN, W GURZHIEV, SN GUTIERREZ, P GUTNIKOV, YE HADLEY, NJ HAGGERTY, H HAGOPIAN, S HAGOPIAN, V HAHN, KS HALL, RE HANSEN, S HATCHER, R HAUPTMAN, JM HEDIN, D HEINSON, AP HEINTZ, U HERNANDEZMONTOYA, R HEURING, T HIROSKY, R HOBBS, JD HOENEISEN, B HOFTUN, JS HSIEH, F HU, T HU, T HUEHN, T IGARASHI, S ITO, AS JAMES, E JAQUES, J JERGER, SA JIANG, JZY JOFFEMINOR, T JOHARI, H JOHNS, K JOHNSON, M JOHNSTAD, H JONCKHEERE, A JONES, M JOSTLEIN, H JUN, SY JUNG, CK KAHN, S KALBFLEISCH, G KANG, JS KEHOE, R KELLY, ML KERNAN, A KERTH, L KIM, CL KIM, SK KLATCHKO, A KLIMA, B KLOCHKOV, BI KLOPFENSTEIN, C KLYUKHIN, VI KOCHETKOV, VI KOHLI, JM KOLTICK, D KOSTRITSKIY, AV KOTCHER, J KOURLAS, J KOZELOV, AV KOZLOVSKI, EA KRISHNASWAMY, MR KRZYWDZINSKI, S KUNORI, S LAMI, S LANDSBERG, G LANOU, RE LEBRAT, JF LEFLAT, A LI, H LI, J LI, YK LIDEMARTEAU, QZ LIMA, JGR LINCOLN, D LINN, SL LINNEMANN, J LIPTON, R LIU, YC LOBKOWICZ, F LOKEN, SC LOKOS, S LUEKING, L LYON, AL MACIEL, AKA MADARAS, RJ MADDEN, R MANDRICHENKO, IV MANGEOT, P MANI, S MANSOULIE, B MAO, HS MARGULIES, S MARKELOFF, R MARKOSKY, L MARSHALL, T MARTIN, MI MARX, M MAY, B MAYOROV, AA MCCARTHY, R MCKIBBEN, T MCKINLEY, J MCMAHON, T MELANSON, HL NETO, JRTDM MERRITT, KW MIETTINEN, H MILDER, A MINCER, A DEMIRANDA, JM MISHRA, CS MOHAMMADIBAARMAND, M MOKHOV, N MONDAL, NK MONTGOMERY, HE MOONEY, P MUDAN, M MURPHY, C MURPHY, CT NANG, F NARAIN, M NARASIMHAM, VS NARAYANAN, A NEAL, HA NEGRET, JP NEIS, E NEMETHY, P NESIC, D NORMAN, D OESCH, L OGURI, V OLTMAN, E OSHIMA, N OWEN, D PADLEY, P PANG, M PARA, A PARK, CH PARK, YM PARTRIDGE, R PARUA, N PATERNO, M PERKINS, J PERYSHKIN, A PETERS, M PIEKARZ, H PISCHALNIKOV, Y PLUQUET, A PODSTAVKOV, VM POPE, BG PROSPER, HB PROTOPOPESCU, S PUSELJIC, D QIAN, J QUINTAS, PZ RAJA, R RAJAGOPALAN, S RAMIREZ, O RAO, MVS RAPIDIS, PA RASMUSSEN, L READ, AL REUCROFT, S RIJSSENBEEK, M ROCKWELL, T ROE, NA RUBINOV, P RUCHTI, R RUSIN, S RUTHERFOORD, J SANTORO, A SAWYER, L SCHAMBERGER, RD SCHELLMAN, H SCULLI, J SHABALINA, E SHAFFER, C SHANKAR, HC SHIVPURI, RK SHUPE, M SINGH, JB SIROTENKO, V SMART, W SMITH, A SMITH, RP SNIHUR, R SNOW, GR SNYDER, S SOLOMON, J SOOD, PM SOSEBEE, M SOUZA, M SPADAFORA, AL STEPHENS, RW STEVENSON, ML STEWART, D STOIANOVA, DA STOKER, D STREETS, K STROVINK, M TAKETANI, A TAMBURELLO, P TARAZI, J TARTAGLIA, M TAYLOR, TL TEIGER, J THOMPSON, J TRIPPE, TG TUTS, PM VARELAS, N VARNES, EW VIRADOR, PRG VITITOE, D VOLKOV, AA VOROBIEV, AP WAHL, HD WANG, G WANG, J WANG, LZ WARCHOL, J WAYNE, M WEERTS, H WEN, F WENZEL, WA WHITE, A WHITE, JT WIGHTMAN, JA WILCOX, J WILLIS, S WIMPENNY, SJ WIRJAWAN, JVD WOMERSLEY, J WON, E WOOD, DR XU, H YAMADA, R YAMIN, P YANAGISAWA, C YANG, J YASUDA, T YOSHIKAWA, C YOUSSEF, S YU, J YU, Y ZHANG, Y ZHOU, YH ZHU, Q ZHU, YS ZHU, ZH ZIEMINSKA, D ZIEMINSKI, A ZYLBERSTEJN, A TI TRANSVERSE ENERGY-DISTRIBUTIONS WITHIN JETS IN P(P)OVER-BAR COLLISIONS AT ROOT-S=1.8 TEV SO PHYSICS LETTERS B LA English DT Article DE EXPERIMENTAL; P-PBAR INTERACTIONS; QCD STUDIES; JETS; JET SHAPES; FORWARD REGION; NEXT-TO-LEADING ORDER ID LUND MONTE-CARLO; PARTON DISTRIBUTIONS; HADRON COLLIDERS; QUARKS; QCD AB The distribution of the transverse energy in jets has been measured in p $($) over bar$$ p collisions at root s = 1.8 TeV using the DO detector at Fermilab. This measurement of the jet shape is made as st function of jet transverse energy in both the central and forward rapidity regions. Jets are shown to narrow both with increasing transverse energy and with increasing rapidity. Next-to-leading order partonic QCD calculations are compared to the data. Although the calculations qualitatively describe the data, they are shown to be very dependent on renormalization scale, parton clustering algorithm, and jet direction definition and they fail to describe the data in all regions consistently. C1 UNIV LOS ANDES,BOGOTA,COLOMBIA. UNIV ARIZONA,TUCSON,AZ 85721. BROOKHAVEN NATL LAB,UPTON,NY 11973. BROWN UNIV,PROVIDENCE,RI 02912. UNIV CALIF DAVIS,DAVIS,CA 95616. UNIV CALIF IRVINE,IRVINE,CA 92717. UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92521. CTR BRASILEIRO PESQUISAS FIS,LAFEX,RIO JANEIRO,BRAZIL. CINVESTAV IPN,MEXICO CITY,DF,MEXICO. COLUMBIA UNIV,NEW YORK,NY 10027. UNIV DELHI,DELHI 110007,INDIA. FLORIDA STATE UNIV,TALLAHASSEE,FL 32306. UNIV HAWAII,HONOLULU,HI 96822. UNIV ILLINOIS,CHICAGO,IL 60607. INDIANA UNIV,BLOOMINGTON,IN 47405. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. KOREA UNIV,SEOUL 136701,SOUTH KOREA. KYUNGSUNG UNIV,PUSAN,SOUTH KOREA. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV MARYLAND,COLLEGE PK,MD 20742. UNIV MICHIGAN,ANN ARBOR,MI 48109. MICHIGAN STATE UNIV,E LANSING,MI 48824. MOSCOW MV LOMONOSOV STATE UNIV,MOSCOW,RUSSIA. UNIV NEBRASKA,LINCOLN,NE 68588. NYU,NEW YORK,NY 10003. NORTHEASTERN UNIV,BOSTON,MA 02115. NO ILLINOIS UNIV,DE KALB,IL 60115. NORTHWESTERN UNIV,EVANSTON,IL 60208. UNIV NOTRE DAME,NOTRE DAME,IN 46556. UNIV OKLAHOMA,NORMAN,OK 73019. PUNJABI UNIV,CHANDIGARH 160014,INDIA. PROTVINO HIGH ENERGY PHYS INST,PROTVINO 142284,RUSSIA. PURDUE UNIV,W LAFAYETTE,IN 47907. RICE UNIV,HOUSTON,TX 77251. UNIV ROCHESTER,ROCHESTER,NY 14627. CEA SACLAY,DAPNIA,SERV PHYS PARTICULES,GIF SUR YVETTE,FRANCE. SEOUL NATL UNIV,SEOUL,SOUTH KOREA. SUNY STONY BROOK,STONY BROOK,NY 11794. SSC LAB,DALLAS,TX 75237. TATA INST FUNDAMENTAL RES,BOMBAY 400005,MAHARASHTRA,INDIA. UNIV TEXAS,ARLINGTON,TX 76019. TEXAS A&M UNIV,COLLEGE STN,TX 77843. RP ABACHI, S (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. RI de Mello Neto, Joao/C-5822-2013; Aihara, Hiroaki/F-3854-2010; Taketani, Atsushi/E-1803-2017; Shivpuri, R K/A-5848-2010; Gutierrez, Phillip/C-1161-2011; Leflat, Alexander/D-7284-2012; Klyukhin, Vyacheslav/D-6850-2012; De, Kaushik/N-1953-2013; Oguri, Vitor/B-5403-2013; Alves, Gilvan/C-4007-2013; Kim, Sun Kee/G-2042-2015; Chekulaev, Sergey/O-1145-2015 OI de Mello Neto, Joao/0000-0002-3234-6634; Aihara, Hiroaki/0000-0002-1907-5964; Taketani, Atsushi/0000-0002-4776-2315; Klyukhin, Vyacheslav/0000-0002-8577-6531; De, Kaushik/0000-0002-5647-4489; Kim, Sun Kee/0000-0002-0013-0775; NR 25 TC 43 Z9 43 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD SEP 7 PY 1995 VL 357 IS 3 BP 500 EP 508 DI 10.1016/0370-2693(95)00889-S PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA RU597 UT WOS:A1995RU59700036 ER PT J AU CLARK, DL GRUMBINE, SK SCOTT, BL WATKIN, JG AF CLARK, DL GRUMBINE, SK SCOTT, BL WATKIN, JG TI UNIQUE MOLECULAR-STRUCTURE OF THE ACTINIDE HYDRIDO ARYLOXIDE COMPLEX TH-3(MU(3)-H)(2)(MU(2)-H)(4)(O-2,6-T-BU(2)C(6)H(3))(6) SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID RAY CRYSTAL-STRUCTURE; ALKOXIDE CHEMISTRY; YTTRIUM; HYDROGENATION; HYDROCARBYLS; TANTALUM; LIGANDS; BONDS; RINGS RP CLARK, DL (reprint author), LOS ALAMOS NATL LAB,DIV CHEM SCI & TECHNOL,POB 1663,LOS ALAMOS,NM 87545, USA. RI Clark, David/A-9729-2011; Scott, Brian/D-8995-2017 OI Scott, Brian/0000-0003-0468-5396 NR 38 TC 9 Z9 9 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD SEP 6 PY 1995 VL 117 IS 35 BP 9089 EP 9090 DI 10.1021/ja00140a035 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA RT724 UT WOS:A1995RT72400035 ER PT J AU CHEN, H OLMSTEAD, MM MAESTRE, MF FISH, RH AF CHEN, H OLMSTEAD, MM MAESTRE, MF FISH, RH TI BIOORGANOMETALLIC CHEMISTRY .7. A NOVEL, LINEAR, 2-COORDINATE RH(I) ANIONIC AMIDE COMPLEX FORMED BY THE REACTION OF THE NUCLEOBASE, 1-METHYLTHYMINE, WITH THE [(CP(ASTERISK)RH)(2)(MU-OH)(3)](+) CATION AT PH-10 - MOLECULAR RECOGNITION AND ELECTROSTATIC INTERACTION WITHIN AN ORGANOMETALLIC HYDROPHOBIC CAVITY SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID (ETA-5-PENTAMETHYLCYCLOPENTADIENYL)RHODIUM AQUA COMPLEX; ADENOSINE-MONOPHOSPHATE; 2-COORDINATE; DERIVATIVES; DNA; CRYSTALLINE C1 UNIV CALIF BERKELEY,LAWRENCE BERKLEY NATL LAB,BERKELEY,CA 94720. UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616. NR 34 TC 16 Z9 16 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD SEP 6 PY 1995 VL 117 IS 35 BP 9097 EP 9098 DI 10.1021/ja00140a039 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA RT724 UT WOS:A1995RT72400039 ER PT J AU HARPEL, MR SERPERSU, EH LAMERDIN, JA HUANG, ZH GAGE, DA HARTMAN, FC AF HARPEL, MR SERPERSU, EH LAMERDIN, JA HUANG, ZH GAGE, DA HARTMAN, FC TI OXYGENATION MECHANISM OF RIBULOSE-BISPHOSPHATE CARBOXYLASE OXYGENASE - STRUCTURE AND ORIGIN OF 2-CARBOXYTETRITOL 1,4-BISPHOSPHATE, A NOVEL O-2-DEPENDENT SIDE PRODUCT GENERATED BY A SITE-DIRECTED MUTANT SO BIOCHEMISTRY LA English DT Article ID RIBULOSE-1,5-BISPHOSPHATE CARBOXYLASE; RHODOSPIRILLUM-RUBRUM; ACTIVE-SITE; ACETOLACTATE SYNTHASE; COUPLING-CONSTANTS; RUBISCO SUBSTRATE; CRYSTAL-STRUCTURE; ENEDIOL MOIETY; 1,5-BISPHOSPHATE; MUTAGENESIS AB Site-directed mutagenesis has implicated active-site Lys329 of Rhodospirillum rubrum ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) in promoting the reaction of CO2 with the 2,3-enediol of ribulose bisphosphate and in stabilizing carboxylation intermediates [Hartman, F. C., & Lee, E. H. (1989) J. Biol. Chem. 264, 11784-11789; Lorimer, G. H., Chen, Y.-R., & Hartman, F. C. (1993) Biochemistry 32, 9018-9024]. Although the K329A mutant is greatly impaired in carboxylation, it catalyzes formation of the enediol, which is misprocessed to an O-2-dependent side product [Harpel, M. R., & Hartman, F. C. (1994) Biochemistry 33, 5553-5561]. We now identify this novel side product as 2-carboxytetritol 1,4-bisphosphate (CTBP) by mass spectrometry, H-1-, C-13-, and P-31-NMR spectroscopy, and periodate oxidation. H2O2 accumulates during formation of CTBP, which we show to be derived from a transient precursor, the dicarbonyl D-glycero-2,3-pentodiulose 1,5-bisphosphate. The isolated dicarbonyl bisphosphate is processed by K329A to CTBP. These results, combined with isotope-labeling studies, suggest that CTBP arises by H2O2 elimination from an improperly stabilized peroxy adduct of the enediol intermediate, followed by rearrangement of the resulting dicarbonyl. Therefore, normal oxygenation, as catalyzed by wild-type Rubisco, is not a spontaneous reaction but must involve stabilization of the peroxy intermediate to mitigate formation of the dicarbonyl bisphosphate and subsequently CTBP. CTBP formation verifies the identity of Rubisco's previously invoked oxygenase intermediate, provides additional mechanistic insight into the oxygenation reaction, and shows that Lys329 promotes oxygenation as well as carboxylation. These results may be relevant to other oxygenases, which also exploit substrate carbanions rather than organic cofactors or transition metals for biological oxygen utilization. C1 OAK RIDGE NATL LAB, DIV BIOL, PROT ENGN PROGRAM, OAK RIDGE, TN 37831 USA. UNIV TENNESSEE, DEPT BIOCHEM, KNOXVILLE, TN 37996 USA. MICHIGAN STATE UNIV, MASS SPECT FACIL, DEPT BIOCHEM, E LANSING, MI 48824 USA. FU NCRR NIH HHS [RR00480]; NIGMS NIH HHS [GM42661] NR 63 TC 33 Z9 33 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD SEP 5 PY 1995 VL 34 IS 35 BP 11296 EP 11306 DI 10.1021/bi00035a039 PG 11 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA RV050 UT WOS:A1995RV05000039 PM 7669788 ER PT J AU ROSS, RB KERN, CW PITZER, RM ERMLER, WC AF ROSS, RB KERN, CW PITZER, RM ERMLER, WC TI AB-INITIO STUDIES OF THE ELECTRONIC-STRUCTURE OF BE-93, BE-105, BE-111, AND BE-123 CLUSTERS SO INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY LA English DT Article ID ABINITIO CALCULATIONS; BERYLLIUM; STATES; DENSITY AB Ab initio self-consistent-field calculations are reported for electronic states of beryllium clusters comprised of 93, 105, 111, and 123 atoms. The respective clusters correspond to coordination shells 12-15 of a central Be atom with internuclear separations derived from the lattice constants of the bulk metal. Ab initio effective core potentials have been employed to replace the Is electrons, thereby reducing the complexity of the calculations. In addition, use of the full D-3h point group symmetry of the clusters results in a substantial reduction of the numbers of two-electron integrals that must be computed and processed. Binding energies, orbital energies, electric field gradient, nuclear-electrostatic potential, diamagnetic shielding constant, second moments, and Mulliken populations are calculated for selected electronic states. Calculated binding energies when compared among the different clusters as well as to smaller and larger fragments from earlier studies provide evidence for the onset of convergence to the Hartree-Fock limit of the bulk. Lowest-state ionization potentials are consistently above and agree to within 14% of the experimental workfunction. The net charge on the central beryllium atom decreases toward zero. The variability of observed bulklike behavior for the different properties indicates that the transition between cluster and bulklike behavior is not sharp and depends on the quantity of interest. (C) 1995 John Wiley and Sons, Inc. C1 US DOE,GTN,WASHINGTON,DC 20585. PPG IND INC,CTR COATINGS & RESINS RES & ENGN,ALLISON PK,PA 15101. NORTHWESTERN UNIV,DEPT CHEM,EVANSTON,IL 60208. STEVENS INST TECHNOL,DEPT CHEM & CHEM ENGN,HOBOKEN,NJ 07030. RP ROSS, RB (reprint author), OHIO STATE UNIV,DEPT CHEM,COLUMBUS,OH 43210, USA. RI Ermler, Walter/B-6876-2011 NR 25 TC 2 Z9 2 U1 1 U2 1 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0020-7608 J9 INT J QUANTUM CHEM JI Int. J. Quantum Chem. PD SEP 5 PY 1995 VL 55 IS 5 BP 393 EP 410 DI 10.1002/qua.560550504 PG 18 WC Chemistry, Physical; Mathematics, Interdisciplinary Applications; Physics, Atomic, Molecular & Chemical SC Chemistry; Mathematics; Physics GA RL036 UT WOS:A1995RL03600003 ER PT J AU WARREN, WL TUTTLE, BA DIMOS, D AF WARREN, WL TUTTLE, BA DIMOS, D TI FERROELECTRIC FATIGUE IN PEROVSKITE OXIDES SO APPLIED PHYSICS LETTERS LA English DT Article ID BATIO3 AB We find that the reduction of the switchable polarization in BaTiO3 crystals via repeated polarization reversals (fatigue) is accompanied by the trapping of electronic charge and atomic scale distortions in the perovskite oxygen octahedron. The distortions are proposed to involve oxygen vacancies. (C) 1995 American Institute of Physics. RP WARREN, WL (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 14 TC 133 Z9 136 U1 2 U2 33 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 4 PY 1995 VL 67 IS 10 BP 1426 EP 1428 DI 10.1063/1.114515 PG 3 WC Physics, Applied SC Physics GA RR440 UT WOS:A1995RR44000029 ER PT J AU BARBIERI, R HALL, L STRUMIA, A AF BARBIERI, R HALL, L STRUMIA, A TI HADRONIC FLAVOR AND CP-VIOLATING SIGNALS OF SUPERUNIFICATION SO NUCLEAR PHYSICS B LA English DT Article ID RARE B-DECAYS; SUPERSYMMETRIC THEORIES; SUPERGRAVITY; B->S-GAMMA; BREAKING; MODELS; MATRIX AB The flavor changing and CP-violating phenomena predicted in supersymmetric unified theories as a consequence of the large top quark Yukawa coupling, are investigated in the quark sector and compared with related phenomena in the lepton sector, considered previously. In particular we study epsilon(K), epsilon(K)'/epsilon(K), Delta(mB), b --> s gamma, the neutron electric dipole moment, d(n), and CP violation in neutral B meson decays, both in minimal SU(5) and SO(10) theories. The leptonic signals are generically shown to provide more significant tests of quark-lepton unification. Nevertheless, mostly in the SO(10) case, a variety of hadronic signals is also possible, with interesting correlations among them. C1 IST NAZL FIS NUCL,SEZ PISA,I-56126 PISA,ITALY. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP BARBIERI, R (reprint author), UNIV PISA,DIPARTIMENTO FIS,PIAZZA TORRICELLI 2,I-56126 PISA,ITALY. NR 38 TC 100 Z9 100 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD SEP 4 PY 1995 VL 449 IS 3 BP 437 EP 461 DI 10.1016/0550-3213(95)00311-F PG 25 WC Physics, Particles & Fields SC Physics GA RT735 UT WOS:A1995RT73500001 ER PT J AU LAZAREV, YA LOBANOV, YV OGANESSIAN, YT TSYGANOV, YS UTYONKOV, VK ABDULLIN, FS ILIEV, S POLYAKOV, AN RIGOL, J SHIROKOVSKY, IV SUBBOTIN, VG SUKHOV, AM BUKLANOV, GV GIKAL, BN KUTNER, VB MEZENTSEV, AN SEDYKH, IM VAKATOV, DV LOUGHEED, RW WILD, JF MOODY, KJ HULET, EK AF LAZAREV, YA LOBANOV, YV OGANESSIAN, YT TSYGANOV, YS UTYONKOV, VK ABDULLIN, FS ILIEV, S POLYAKOV, AN RIGOL, J SHIROKOVSKY, IV SUBBOTIN, VG SUKHOV, AM BUKLANOV, GV GIKAL, BN KUTNER, VB MEZENTSEV, AN SEDYKH, IM VAKATOV, DV LOUGHEED, RW WILD, JF MOODY, KJ HULET, EK TI NEW NUCLIDE-(267)108 PRODUCED BY THE U-238+S-34 REACTION SO PHYSICAL REVIEW LETTERS LA English DT Article ID ELEMENT 106; NUCLEI AB In bombardments of U-238 targets with 186-MeV S-34 projectiles we discovered the alpha-decaying nuclide (267)108 with a half-life of 19(-10)(+29) ms, E(alpha) = 9.74 to 9.87 MeV, and a production cross section of about 2.5 pb. The new nuclide was identified by measuring correlations in energy, time, and position to establish genetic links between its implantation in a position-sensitive silicon detector and subsequent alpha decay followed by alpha decays of known descendant nuclides. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. RP LAZAREV, YA (reprint author), JOINT INST NUCL RES,DUBNA 141980,RUSSIA. NR 24 TC 105 Z9 105 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 4 PY 1995 VL 75 IS 10 BP 1903 EP 1906 DI 10.1103/PhysRevLett.75.1903 PG 4 WC Physics, Multidisciplinary SC Physics GA RR428 UT WOS:A1995RR42800008 ER PT J AU DRAGT, AJ AF DRAGT, AJ TI COMPUTATION OF MAPS FOR PARTICLE AND LIGHT OPTICS BY SCALING, SPLITTING, AND SQUARING SO PHYSICAL REVIEW LETTERS LA English DT Article AB New methods are presented for the integration of autonomous flows, with an emphasis on the Hamiltonian case. The Hamiltonian results are expected to have important applications for charged-particle optics (including accelerator design) and for graded-index light optics. C1 UNIV MARYLAND,DEPT PHYS,COLLEGE PK,MD 20742. RP DRAGT, AJ (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 10 TC 14 Z9 15 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 4 PY 1995 VL 75 IS 10 BP 1946 EP 1948 DI 10.1103/PhysRevLett.75.1946 PG 3 WC Physics, Multidisciplinary SC Physics GA RR428 UT WOS:A1995RR42800019 ER PT J AU ANTHONY, PL BECKERSZENDY, R BOSTED, PE CAVALLISFORZA, M KELLER, LP KELLEY, LA KLEIN, SR NIEMI, G PERL, ML ROCHESTER, LS WHITE, JL AF ANTHONY, PL BECKERSZENDY, R BOSTED, PE CAVALLISFORZA, M KELLER, LP KELLEY, LA KLEIN, SR NIEMI, G PERL, ML ROCHESTER, LS WHITE, JL TI AN ACCURATE MEASUREMENT OF THE LANDAU-POMERANCHUK-MIGDAL EFFECT SO PHYSICAL REVIEW LETTERS LA English DT Article AB In the 1950s, Landau, Pomeranchuk, acid Migdal (LPM) predicted that the cross section for bremsstrahlung from highly relativistic particles in dense media would be suppressed due to interference between amplitudes of nearby interactions. We have measured the production rates of 5 to 500 MeV photons from 8 and 25 GeV electrons traversing thin gold and carbon targets. We observe, to within 5% accuracy, suppression at the level predicted by Migdal. For extremely thin targets, we observe ''edge effects'' where the LPM suppression is reduced near the edges of the targets. We also point out the imprecise foundation of the LPM theory. C1 AMERICAN UNIV,WASHINGTON,DC 20016. UNIV CALIF SANTA CRUZ,SANTA CRUZ INST PARTICLE PHYS,SANTA CRUZ,CA 95064. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP ANTHONY, PL (reprint author), STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. RI Cavalli-Sforza, Matteo/H-7102-2015 NR 14 TC 78 Z9 78 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 4 PY 1995 VL 75 IS 10 BP 1949 EP 1952 DI 10.1103/PhysRevLett.75.1949 PG 4 WC Physics, Multidisciplinary SC Physics GA RR428 UT WOS:A1995RR42800020 ER PT J AU LINDEMUTH, IR REINOVSKY, RE CHRIEN, RE CHRISTIAN, JM EKDAHL, CA GOFORTH, JH HAIGHT, RC IDZOREK, G KING, NS KIRKPATRICK, RC LARSON, RE MORGAN, GL OLINGER, BW OONA, H SHEEHEY, PT SHLACHTER, JS SMITH, RC VEESER, LR WARTHEN, BJ YOUNGER, SM CHERNYSHEV, VK MOKHOV, VN DEMIN, AN DOLIN, YN GARANIN, SF IVANOV, VA KORCHAGIN, VP MIKHAILOV, OD MOROZOV, IV PAK, SV PAVLOVSKII, ES SELEZNEV, NY SKOBELEV, AN VOLKOV, GI YAKUBOV, VA AF LINDEMUTH, IR REINOVSKY, RE CHRIEN, RE CHRISTIAN, JM EKDAHL, CA GOFORTH, JH HAIGHT, RC IDZOREK, G KING, NS KIRKPATRICK, RC LARSON, RE MORGAN, GL OLINGER, BW OONA, H SHEEHEY, PT SHLACHTER, JS SMITH, RC VEESER, LR WARTHEN, BJ YOUNGER, SM CHERNYSHEV, VK MOKHOV, VN DEMIN, AN DOLIN, YN GARANIN, SF IVANOV, VA KORCHAGIN, VP MIKHAILOV, OD MOROZOV, IV PAK, SV PAVLOVSKII, ES SELEZNEV, NY SKOBELEV, AN VOLKOV, GI YAKUBOV, VA TI TARGET PLASMA FORMATION FOR MAGNETIC COMPRESSION MAGNETIZED TARGET FUSION SO PHYSICAL REVIEW LETTERS LA English DT Article AB Experimental observations of plasma behavior in a novel plasma formation chamber are reported. Experimental results are in reasonable agreement with two-dimensional magnetohydrodynamic computations suggesting that the plasma could subsequently be adiabatically compressed by a magnetically driven pusher to yield 1 GJ of fusion energy. An explosively driven helical flux compression generator mated with a unique closing switch/opening switch combination delivered a 2.7 MA, 347 mu s magnetization current and an additional 5 MA, 2.5 mu s electrical pulse to the chamber. A hot plasma was produced and 10(13) D-T fusion reactions were observed. C1 ALL RUSSIAN SCI RES INST EXPTL PHYS,ARZAMAS 16,RUSSIA. EG&G ENERGY MEASUREMENTS INC,LOS ALAMOS OPERAT,LOS ALAMOS,NM 87545. RP LINDEMUTH, IR (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 15 TC 65 Z9 66 U1 0 U2 11 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 4 PY 1995 VL 75 IS 10 BP 1953 EP 1956 DI 10.1103/PhysRevLett.75.1953 PG 4 WC Physics, Multidisciplinary SC Physics GA RR428 UT WOS:A1995RR42800021 ER PT J AU PITAEVSKII, LP RANDERIA, M AF PITAEVSKII, LP RANDERIA, M TI TRANSMUTATION OF STATISTICS AND THE ONE-PARTICLE DENSITY-MATRIX IN 2 DIMENSIONS - SOME EXACT RESULTS SO PHYSICS LETTERS A LA English DT Article ID ORDER AB We attach an arbitrary number of flux tubes to each particle in non-interacting Bose and Fermi systems in 2D. The single-particle density matrices of the resulting systems of composites are calculated exactly at T = 0 and shown to be of the form [r\rho(1)\r'] = n delta(r,r') in the thermodynamic limit. Thus the rho(1) of the new systems have no information about the ODLRO or the Fermi surface in the original systems. C1 TECHNION ISRAEL INST TECHNOL, DEPT PHYS, IL-32000 HAIFA, ISRAEL. PL KAPITZA PHYS PROBLEMS INST, MOSCOW, RUSSIA. RP ARGONNE NATL LAB, DIV MAT SCI 223, 9700 S CASS AVE, ARGONNE, IL 60439 USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 EI 1873-2429 J9 PHYS LETT A JI Phys. Lett. A PD SEP 4 PY 1995 VL 205 IS 1 BP 85 EP 89 DI 10.1016/0375-9601(95)00520-D PG 5 WC Physics, Multidisciplinary SC Physics GA RT075 UT WOS:A1995RT07500016 ER PT J AU SIMUNOVIC, S SAIGAL, S AF SIMUNOVIC, S SAIGAL, S TI CONTACT SURFACE OPTIMIZATION USING BOUNDARY-ELEMENT METHOD SO COMPUTERS & STRUCTURES LA English DT Article ID SHAPE OPTIMIZATION; SENSITIVITY ANALYSIS; DESIGN; BEM AB A contact surface design technique, based on a linear programming formulation that was originally developed for the finite element method, has been extended to contact problems modeled using the boundary element method. The design optimization is driven by the minimization of peak contact traction that is a primary variable in the boundary element method. The contact of an elastic body with a rigid surface is considered. The schemes for the modification of the geometry of both the rigid surface and the elastic body are proposed. The solutions of example problems are presented to demonstrate the validity of the present formulations. C1 CARNEGIE MELLON UNIV,DEPT CIVIL ENGN,PITTSBURGH,PA 15213. RP SIMUNOVIC, S (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,PROC MODELING GRP,POB 2008,OAK RIDGE,TN 37831, USA. NR 15 TC 7 Z9 7 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0045-7949 J9 COMPUT STRUCT JI Comput. Struct. PD SEP 3 PY 1995 VL 56 IS 5 BP 745 EP 750 DI 10.1016/0045-7949(95)00005-2 PG 6 WC Computer Science, Interdisciplinary Applications; Engineering, Civil SC Computer Science; Engineering GA RJ227 UT WOS:A1995RJ22700005 ER PT J AU SOMOZA, JR SZOKE, H GOODMAN, DM BERAN, P TRUCKSES, D KIM, SH SZOKE, A AF SOMOZA, JR SZOKE, H GOODMAN, DM BERAN, P TRUCKSES, D KIM, SH SZOKE, A TI HOLOGRAPHIC METHODS IN X-RAY CRYSTALLOGRAPHY .4. A FAST ALGORITHM AND ITS APPLICATION TO MACROMOLECULAR CRYSTALLOGRAPHY SO ACTA CRYSTALLOGRAPHICA SECTION A LA English DT Article ID CRYSTAL-STRUCTURE; STAPHYLOCOCCAL NUCLEASE; RESOLUTION AB The holographic method makes use of partially modeled electron density and experimentally measured structure-factor amplitudes to recover electron density corresponding to the unmodeled part of a crystal structure. This paper describes a fast algorithm that makes it possible to apply the holographic method to sizable crystallographic problems. The algorithm uses positivity constraints on the electron density and can incorporate a 'target' electron density, making it similar to solvent flattening. The potential for applying the holographic method to macromolecular X-ray crystallography is assessed using both synthetic and experimental data. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV WISCONSIN,DEPT BIOCHEM,MADISON,WI 53711. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 19 TC 22 Z9 22 U1 0 U2 2 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-7673 J9 ACTA CRYSTALLOGR A JI Acta Crystallogr. Sect. A PD SEP 1 PY 1995 VL 51 BP 691 EP 708 DI 10.1107/S0108767395002315 PN 5 PG 18 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA RY798 UT WOS:A1995RY79800009 PM 7576377 ER PT J AU SCHOTTE, KD SCHOTTE, U BLEIF, HJ PAPOULAR, R AF SCHOTTE, KD SCHOTTE, U BLEIF, HJ PAPOULAR, R TI MAXIMUM-ENTROPY ANALYSIS OF THE CUBIC PHASES OF KOH AND KOD, NAOH AND NAOD SO ACTA CRYSTALLOGRAPHICA SECTION A LA English DT Article ID ELECTRON-DENSITY-DISTRIBUTION AB The maximum-entropy method (MEM) for structure determination is applied on the plastically crystalline phases of KOH and KOD characterized by delocalized H+ or D+ ions in a simple rock salt structure. The structure factors measured by neutron diffraction already give a consistent picture of the hydrogen distribution by conventional Fourier and modelling methods, which helps to understand the merit of the MEM. Owing to the negative sign of the scattering length of hydrogen, the MEM can, in a limited sense 'model free', separate off the hydrogen density distribution. It is found, however, that the MEM cannot be applied naively for these compounds and reasons are given why the uniform density as a priori information has to be given up in the present case. The a priori information procedure to be used is discussed. In addition, and perhaps unexpectedly, the deuterium density is also obtained. C1 HAHN MEITNER INST BERLIN GMBH, BENSC, D-14109 BERLIN, GERMANY. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. CHRISTIAN ALBRECHTS UNIV KIEL, INST MINERAL PETROG, KIEL, GERMANY. RP SCHOTTE, KD (reprint author), FREE UNIV BERLIN, INST THEORET PHYS, ARNIMALLEE 14, D-14195 BERLIN, GERMANY. NR 17 TC 9 Z9 9 U1 0 U2 0 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0108-7673 J9 ACTA CRYSTALLOGR A JI Acta Crystallogr. Sect. A PD SEP 1 PY 1995 VL 51 BP 739 EP 746 DI 10.1107/S0108767395004934 PN 5 PG 8 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA RY798 UT WOS:A1995RY79800012 ER PT J AU TERWILLIGER, TC BERENDZEN, J AF TERWILLIGER, TC BERENDZEN, J TI DIFFERENCE REFINEMENT - OBTAINING DIFFERENCES BETWEEN 2 RELATED STRUCTURES SO ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY LA English DT Article ID CRYSTALLOGRAPHIC REFINEMENT; MOLECULAR-DYNAMICS; HEMOGLOBIN; CONSEQUENCES; BINDING; SITE AB There are many examples in macromolecular crystallography where interest focuses on the differences between a previously determined 'native' structure and a nearly isomorphous 'variant'. In such cases, a useful approach to atomic refinement of the variant structure is through weighted least-squares minimization of the residual between the observed and calculated differences in amplitudes of structure factors, a strategy first used in the refinement of deoxycobalt hemoglobin [Fermi, Perutz, Dickinson & Chien (1982). J. Mol. Biol. 155, 495-505] and termed 'difference refinement'. For cases in which the modeling errors for the native and variant structures are correlated, theoretical arguments indicate that difference refinement should lead to improved estimates of structural differences when compared with conventional independent refinement. Tests employing simulated peptide data sets and real data from a wild-type protein and a mutant show that difference refinement can substantially reduce errors in the differences between structures when compared with independent refinement. The algorithm is very easy to implement and does not increase the computational demands of refinement. C1 LOS ALAMOS NATL LAB,BIOPHYS GRP,LOS ALAMOS,NM 87545. RP TERWILLIGER, TC (reprint author), LOS ALAMOS NATL LAB,GENOM & STRUCT BIOL GRP,MAIL STOP M880,LOS ALAMOS,NM 87545, USA. RI Terwilliger, Thomas/K-4109-2012 OI Terwilliger, Thomas/0000-0001-6384-0320 NR 17 TC 32 Z9 34 U1 0 U2 2 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0907-4449 J9 ACTA CRYSTALLOGR D JI Acta Crystallogr. Sect. D-Biol. Crystallogr. PD SEP 1 PY 1995 VL 51 BP 609 EP 618 DI 10.1107/S0907444994013247 PN 5 PG 10 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Biophysics; Crystallography SC Biochemistry & Molecular Biology; Biophysics; Crystallography GA RY797 UT WOS:A1995RY79700001 PM 15299790 ER PT J AU LAWSON, CL AF LAWSON, CL TI MODIFIED CROWTHER AND BLOW T-1 TRANSLATION FUNCTION FOR PARTIAL SEARCH MODELS SO ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY LA English DT Note ID TRP REPRESSOR; OPERATOR; COMPLEX AB A simple modification to the fast T-1 translation function of Crowther & Blow [Crowther & Blow (1967). Acta Cryst. 23, 544-548] can reduce systematic error in cases where the input set of oriented search models represents a fraction of the scattering matter of the unknown crystal unit cell. The observed Patterson function is modified by a partial self-vector subtraction (SVS) and then the residual Patterson origin is removed In a test case where a protein/DNA complex crystal was searched using a protein-only model, the highest signal-to-noise ratios for translation-search maps were obtained either with origin removal alone or partial SVS combined with origin removal. Origin removal is likely to be a generally useful alternative to SVS for the T-1 function. RP LAWSON, CL (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973, USA. NR 16 TC 1 Z9 1 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0907-4449 J9 ACTA CRYSTALLOGR D JI Acta Crystallogr. Sect. D-Biol. Crystallogr. PD SEP 1 PY 1995 VL 51 BP 853 EP 855 DI 10.1107/S0907444995002265 PN 5 PG 3 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Biophysics; Crystallography SC Biochemistry & Molecular Biology; Biophysics; Crystallography GA RY797 UT WOS:A1995RY79700037 PM 15299826 ER PT J AU HIGASHI, K NIEH, TG WADSWORTH, J AF HIGASHI, K NIEH, TG WADSWORTH, J TI EFFECT OF TEMPERATURE ON THE MECHANICAL-PROPERTIES OF MECHANICALLY-ALLOYED MATERIALS AT HIGH-STRAIN RATES SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID SUPERPLASTIC BEHAVIOR; ALUMINUM COMPOSITE; AL; DIFFUSION; CREEP AB The superplastic properties of several mechanically-alloyed materials, including IN9021, IN9052, IN905XL and 15 vol.% SiCp/IN9021, have been characterized. The tensile elongation to failure, strain rate sensitivity and activation energy are found to be dependent upon the testing temperature. Specifically, marked changes in these properties are closely related to incipient melting points in the materials. These observations confirm the suggestion that the presence of a small amount of liquid phase at interfaces and grain boundaries not only enhances the strain rate for superplasticity, bur also has a strong influence on the deformation mechanisms. When the amount of liquid phase increases, as a result of increasing temperature, the expected observation is noted, i.e. the presence of the liquid phase degrades the material properties. A model is proposed to explain the experimental observations. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. UNIV OSAKA PREFECTURE, COLL ENGN, DEPT MECH SYST ENGN, SAKAI, OSAKA 593, JAPAN. RI Nieh, Tai-Gang/G-5912-2011 OI Nieh, Tai-Gang/0000-0002-2814-3746 NR 33 TC 78 Z9 80 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD SEP PY 1995 VL 43 IS 9 BP 3275 EP 3282 DI 10.1016/0956-7151(95)00047-Y PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA RP625 UT WOS:A1995RP62500003 ER PT J AU HONG, SI HILL, MA SAKAI, Y WOOD, JT EMBURY, JD AF HONG, SI HILL, MA SAKAI, Y WOOD, JT EMBURY, JD TI ON THE STABILITY OF COLD DRAWN, 2-PHASE WIRES SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID PROCESSED COMPOSITE-MATERIALS; MICROSTRUCTURE; STRENGTH AB Two-phase materials can be deformed by wire drawing to produce materials with tensile strength levels of the order of E/100. In this condition, they possess ultrafine scale microstructures. This paper examines various aspects of the stability of such structures including the mechanical stability of elastically stressed second phases, the tendency to instability by spheroidization, and the occurrence of discontinuous coarsening due to large local gradients of stored energy in drawn two-phase structures. C1 MCMASTER UNIV, DEPT MAT SCI & ENGN, HAMILTON, ON L85 4M1, CANADA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. NATL RES INST MET, TSUKUBA, IBARAKI 305, JAPAN. NR 15 TC 79 Z9 87 U1 0 U2 7 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD SEP PY 1995 VL 43 IS 9 BP 3313 EP 3323 DI 10.1016/0956-7151(95)00050-6 PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA RP625 UT WOS:A1995RP62500007 ER PT J AU MILLER, MK HYDE, JM HETHERINGTON, MG CEREZO, A SMITH, GDW ELLIOTT, CM AF MILLER, MK HYDE, JM HETHERINGTON, MG CEREZO, A SMITH, GDW ELLIOTT, CM TI SPINODAL DECOMPOSITION IN FE-CR ALLOYS - EXPERIMENTAL-STUDY AT THE ATOMIC-LEVEL AND COMPARISON WITH COMPUTER-MODELS .1. INTRODUCTION AND METHODOLOGY SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID CAHN-HILLIARD EQUATION; SMALL-ANGLE SCATTERING; PHASE-SEPARATION; MISCIBILITY GAP; PROBE DESIGNS; CHROMIUM AB A three-part series of papers is presented concerning the atomic scale analysis of spinodal decomposition in Fe-Cr alloys. This first part deals with the experimental techniques and computer simulations, the second part discusses the dynamics of early stage phase separation, and the third part describes the morphological and structural characterization of spinodal microstructures. In this first paper, three-dimensional reconstructions of the atomic structure of a series of thermally aged Fe-Cr alloys are shown. Two methods for computer simulation of the decomposition process are described. The first is an atomistic simulation based on the Monte Carlo algorithm and the second is a numerical solution to the Cahn-Hilliard-Cook theory. The three-dimensional atomic scale structures resulting from decomposition within the low temperature miscibility gap are reconstructed. It is shown that both models generate microstructures which are qualitatively similar to those observed experimentally. C1 UNIV OXFORD, DEPT MAT, OXFORD OX1 3PH, ENGLAND. OAK RIDGE NATL LAB, DIV MET & CERAM, OAK RIDGE, TN 37831 USA. UNIV SUSSEX, SCH MATH & PHYS SCI, BRIGHTON BN1 9QH, E SUSSEX, ENGLAND. RI Elliott, Charles/B-3168-2008 NR 39 TC 123 Z9 126 U1 5 U2 35 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD SEP PY 1995 VL 43 IS 9 BP 3385 EP 3401 DI 10.1016/0956-7151(95)00040-3 PG 17 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA RP625 UT WOS:A1995RP62500013 ER PT J AU HYDE, JM MILLER, MK HETHERINGTON, MG CEREZO, A SMITH, GDW ELLIOTT, CM AF HYDE, JM MILLER, MK HETHERINGTON, MG CEREZO, A SMITH, GDW ELLIOTT, CM TI SPINODAL DECOMPOSITION IN FE-CR ALLOYS - EXPERIMENTAL-STUDY AT THE ATOMIC-LEVEL AND COMPARISON WITH COMPUTER-MODELS .2. DEVELOPMENT OF DOMAIN SIZE AND COMPOSITION AMPLITUDE SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID PHASE-SEPARATION; MONTE-CARLO; DIMENSIONS; EVOLUTION; GROWTH; SYSTEM AB The three-dimensional interconnected microstructures resulting from spinodal decomposition in a series of thermally aged Fe-Cr alloys have been analysed in terms of scale and composition amplitude. The development of the microstructure scale was found to fit a power law with a time exponent considerably smaller than that predicted by the LSW theory but in agreement with Monte Carlo simulations of the decomposition. Numerical solutions to the classical non-linear Cahn-Hilliard-Cook equation were found to fit the classical LSW theory. A model, based on the non-linear theory of spinodal decomposition by Langer et al. is used to quantify the composition amplitude at any stage of the phase separation. A detailed comparison between the atomic scale experimental results and computer simulations of spinodal decomposition is given. C1 UNIV OXFORD, DEPT MAT, OXFORD OX1 3PH, ENGLAND. OAK RIDGE NATL LAB, DIV MET & CERAM, OAK RIDGE, TN 37831 USA. UNIV SUSSEX, SCH MATH & PHYS SCI, BRIGHTON BN1 9QH, E SUSSEX, ENGLAND. RI Elliott, Charles/B-3168-2008 NR 34 TC 56 Z9 60 U1 1 U2 17 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD SEP PY 1995 VL 43 IS 9 BP 3403 EP 3413 DI 10.1016/0956-7151(95)00041-S PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA RP625 UT WOS:A1995RP62500014 ER PT J AU HYDE, JM MILLER, MK HETHERINGTON, MG CEREZO, A SMITH, GDW ELLIOTT, CM AF HYDE, JM MILLER, MK HETHERINGTON, MG CEREZO, A SMITH, GDW ELLIOTT, CM TI SPINODAL DECOMPOSITION IN FE-CR ALLOYS - EXPERIMENTAL-STUDY AT THE ATOMIC-LEVEL AND COMPARISON WITH COMPUTER-MODELS .3. DEVELOPMENT OF MORPHOLOGY SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID FRACTAL ANALYSIS AB The fine-scale three-dimensional microstructures formed during spinodal decomposition in Fe-Cr alloys are characterized using two novel methods. In the first, a fractal analysis is used to characterize the interface between the phases and, in the second, the interconnectivity of the structure is determined from topology. It is found that the interface between Fe-rich alpha and Cr-enriched alpha' regions in the experimental data and Monte Carlo simulations exhibit fractal behaviour whereas the microstructures from the solution to the Cahn-Hilliard-Cook model do not. Topological methods are used to characterize the complex alpha' microstructures in terms of the number of cavities and loops. The decrease in the number of large scale loops in the microstructure, during thermal ageing, is shown to correlate with the increasing microstructural scale. The number of small scale loops is found to correlate with the complexity of the interface between the alpha and alpha' regions. C1 UNIV OXFORD, DEPT MAT, OXFORD OX1 3PH, ENGLAND. OAK RIDGE NATL LAB, DIV MET & CERAM, OAK RIDGE, TN 37831 USA. UNIV SUSSEX, SCH MATH & PHYS SCI, BRIGHTON BN1 9QH, E SUSSEX, ENGLAND. RI Elliott, Charles/B-3168-2008 NR 17 TC 55 Z9 56 U1 0 U2 17 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD SEP PY 1995 VL 43 IS 9 BP 3415 EP 3426 DI 10.1016/0956-7151(95)00042-T PG 12 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA RP625 UT WOS:A1995RP62500015 ER PT J AU PHILLIPS, JM AF PHILLIPS, JM TI THE MATERIALS-RESEARCH-SOCIETY SO ADVANCED MATERIALS LA English DT Editorial Material AB Essay: The 1995 President of the MRS describes recent progress for the Society including its affiliation with the 800 000-member strong Federation of Materials Societies and its activities on the World Wide Web. RP PHILLIPS, JM (reprint author), SANDIA NATL LABS,CTR MAT & PROC SCI,MS 0340,ALBUQUERQUE,NM 87185, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0935-9648 J9 ADV MATER JI Adv. Mater. PD SEP PY 1995 VL 7 IS 9 BP 773 EP & DI 10.1002/adma.19950070902 PG 0 WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Chemistry; Science & Technology - Other Topics; Materials Science; Physics GA RV088 UT WOS:A1995RV08800001 ER PT J AU CHIEW, YC KUEHNER, D BLANCH, HW PRAUSNITZ, JM AF CHIEW, YC KUEHNER, D BLANCH, HW PRAUSNITZ, JM TI MOLECULAR THERMODYNAMICS FOR SALT-INDUCED PROTEIN PRECIPITATION SO AICHE JOURNAL LA English DT Article ID PERCUS-YEVICK APPROXIMATION; DIRECTIONAL ATTRACTIVE FORCES; NONIONIC POLYMER; FLUIDS; DISPERSIONS; MODEL; SITES AB A molecular-thermodynamic model is developed for salt-induced protein precipitation, which considers an aqueous solution of globular protein molecules as a pseudo-one-component system containing macroions that interact through Coulombic repulsion, dispersion attraction and hydrophobic interactions and forces arising from ion-excluded volume. Forces from ion-excluded volume rake into account formation of ion pairs and ionic clusters at high salt concentrations; they are calculated in the context of the Percus-Yevick integral-equation theory. Hydrophobic interactions between exposed nonpolar amino-acid residues on the surfaces of the protein molecules are modeled as short-range, attractive interactions between ''spherical caps'' on the surfaces of the protein polyions. An equation of state is derived using perturbation theory. From this equation of state we calculate liquid-liquid equilibria: equilibrium between an aqueous phase dilute in protein and another aqueous phase rich in protein, which represents ''precipitated'' protein. In the equation of state, center-to-center, spherically symmetric macroion- macroion interactions are described by the random-phase approximation, while the orientation-dependent short-range hydrophobic interaction is incorporated through the perturbation theory of associating fluids. The results suggest that either ion-excluded-volume or hydrophobic-bonding effects can precipitate proteins in aqueous solutions with high salt concentrations. C1 UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. NR 39 TC 34 Z9 34 U1 0 U2 8 PU AMER INST CHEMICAL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0001-1541 J9 AICHE J JI AICHE J. PD SEP PY 1995 VL 41 IS 9 BP 2150 EP 2159 DI 10.1002/aic.690410914 PG 10 WC Engineering, Chemical SC Engineering GA RT799 UT WOS:A1995RT79900013 ER PT J AU FOX, J KRUMMEL, J YARNASARN, S EKASINGH, M PODGER, N AF FOX, J KRUMMEL, J YARNASARN, S EKASINGH, M PODGER, N TI LAND-USE AND LANDSCAPE DYNAMICS IN NORTHERN THAILAND - ASSESSING CHANGE IN 3 UPLAND WATERSHEDS SO AMBIO LA English DT Article ID RESERVE; FORESTS; RAIN AB This study analyzed human-induced loss and fragmentation of tropical forests in three upland watersheds in northern Thailand between 1954 and 1992. During this 38-year period, forest cover declined, agricultural cover increased, population and population density grew, and agriculture changed from subsistence to cash crops. These changes resulted in a spatially diverse landscape with implications for biological and cultural diversity, sustainable resource use, and the economic conditions of the region. By quantifying the spatial and temporal patterns of tropical-forest change, we have attempted to show how the landscape in these upland tropical forests is controlled by physical and biological, as well as social and economic, parameters. The study illustrates the hierarchy of temporal and spatial events that result in global biome changes. C1 ARGONNE NATL LAB,DIV ENVIRONM ASSESSMENT,ECOL & SOCIAL SCI GRP,ARGONNE,IL 60439. CHIANG MAI UNIV,DEPT GEOG,CHIANG MAI 50000,THAILAND. CHIANG MAI UNIV,CTR MULTIPLE CROPPING,CHIANG MAI 50000,THAILAND. RP FOX, J (reprint author), EAST WEST CTR,PROGRAM ENVIRONM,1777 E W RD,HONOLULU,HI 96848, USA. NR 35 TC 54 Z9 62 U1 1 U2 5 PU ROYAL SWEDISH ACAD SCIENCES PI STOCKHOLM PA PUBL DEPT BOX 50005, S-104 05 STOCKHOLM, SWEDEN SN 0044-7447 J9 AMBIO JI Ambio PD SEP PY 1995 VL 24 IS 6 BP 328 EP 334 PG 7 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA TC110 UT WOS:A1995TC11000003 ER PT J AU CRAIG, DK DAVIS, JS DEVORE, R HANSEN, DJ PETROCCHI, AJ POWELL, TJ AF CRAIG, DK DAVIS, JS DEVORE, R HANSEN, DJ PETROCCHI, AJ POWELL, TJ TI ALTERNATIVE GUIDELINE LIMITS FOR CHEMICALS WITHOUT ENVIRONMENTAL RESPONSE PLANNING GUIDELINES SO AMERICAN INDUSTRIAL HYGIENE ASSOCIATION JOURNAL LA English DT Note AB Emergency Response Planning Guideline (ERPG) values are the only well-documented exposure limits developed to date specifically for use in evaluating the health consequences of exposure of the general public to accidental releases of extremely hazardous chemicals. Because ERPG values have so far been developed for relatively few chemicals, there is a need for alternative guidelines to be used for other chemicals. The objective of this work was to provide consistent methodology for the selection of reasonable interim values for these chemicals until such time as official ERPGs are developed. Most of the commonly available published and documented concentration-limit parameters were considered. ERPG values should be used as the primary guidelines for chemical emergency planning. Alternatives are recommended for use when ERPGs are not available. The parameters are to be used in the order presented, based on availability for the chemical of interest. Though these concentration limits were developed for different purposes, and were intended specifically for occupational use, no other options were available. Nonoccupational populations include the young, the aged, and other hypersensitive individuals. For each chemical, the adoption of alternatives to ERPGs should be carefully evaluated. C1 WESTINGHOUSE HANFORD CO,RICHLAND,WA 99352. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. BROOKHAVEN NATL LAB,UPTON,NY 11973. EG&G ROCKY FLATS INC,GOLDEN,CO 80402. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP CRAIG, DK (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,1991 S CENTENNIAL AVE,AIKEN,SC 29803, USA. NR 12 TC 10 Z9 10 U1 0 U2 0 PU AMER INDUSTRIAL HYGIENE ASSOC PI FAIRFAX PA 2700 PROSPERITY AVE #250, FAIRFAX, VA 22031-4307 SN 0002-8894 J9 AM IND HYG ASSOC J JI Am. Ind. Hyg. Assoc. J. PD SEP PY 1995 VL 56 IS 9 BP 919 EP 925 DI 10.1202/0002-8894(1995)056<0919:AGLFCW>2.0.CO;2 PG 7 WC Environmental Sciences; Public, Environmental & Occupational Health SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health GA RT901 UT WOS:A1995RT90100010 ER PT J AU FERNANDEZSALGUERO, P HOFFMAN, SMG CHOLERTON, S MOHRENWEISER, H RAUNIO, H RAUTIO, A PELKONEN, O HUANG, JD EVANS, WE IDLE, JR GONZALEZ, FJ AF FERNANDEZSALGUERO, P HOFFMAN, SMG CHOLERTON, S MOHRENWEISER, H RAUNIO, H RAUTIO, A PELKONEN, O HUANG, JD EVANS, WE IDLE, JR GONZALEZ, FJ TI A GENETIC-POLYMORPHISM IN COUMARIN 7-HYDROXYLATION - SEQUENCE OF THE HUMAN CYP2A GENES AND IDENTIFICATION OF VARIANT CYP2A6 ALLELES SO AMERICAN JOURNAL OF HUMAN GENETICS LA English DT Article ID HUMAN-LIVER-MICROSOMES; CYTOCHROME-P450; SUPERFAMILY; METABOLISM; EVOLUTION; SUBFAMILY; MOUSE; RAT AB A group of human cytochrome P450 genes encompassing the CYP2A, CYP2B, and CYP2F subfamilies were cloned and assembled into a 350-kb contig localized on the long arm of chromosome 19. Three complete CYP2A genes-CYP2A6, CYP2A7, and CYP2A13-plus two pseudogenes truncated after exon 5, were identified and sequenced, A variant CYP2A6 allele that differed from the corresponding CYP2A6 and CYP2A7 cDNAs previously sequenced was found and was designated CYP2A6v2. Sequence differences in the CYP2A6v2 gene are restricted to regions encompassing exons 3, 6, and 8, which bear sequence relatedness with the corresponding exons of the CYP2A7 gene, located downstream and centromeric of CYP2A6v2, suggesting recent gene-conversion events, The sequencing of all the CYP2A genes allowed the design of a PCR diagnostic test for the normal CYP2A6 allele, the CYP2A6v2 allele, and a variant-designated CYP2A6v1-that encodes an enzyme with a single inactivating amino acid change. These variant alleles were found in individuals who were deficient in their ability to metabolize the CYP2A6 probe drug coumarin, The allelic frequencies of CYP2A6v1 and CYP2A6v2 differed significantly between Caucasian, Asian, and African-American populations, These studies establish the existence of a new cytochrome P450 genetic polymorphism. C1 NCI, BETHESDA, MD 20892 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA USA. UNIV NEWCASTLE UPON TYNE, SCH MED, DEPT PHARMACOL SCI, NEWCASTLE UPON TYNE, TYNE & WEAR, ENGLAND. UNIV OULU, DEPT PHARMACOL & TOXICOL, OULU, FINLAND. NATL CHENG KUNG UNIV, DEPT PHARMACOL, TAINAN 70101, TAIWAN. ST JUDE CHILDRENS RES HOSP, DEPT PHARMACEUT, MEMPHIS, TN 38105 USA. OI Fernandez-Salguero, Pedro M./0000-0003-2839-5027; Idle, Jeff/0000-0002-6143-1520 NR 30 TC 249 Z9 255 U1 1 U2 4 PU CELL PRESS PI CAMBRIDGE PA 600 TECHNOLOGY SQUARE, 5TH FLOOR, CAMBRIDGE, MA 02139 USA SN 0002-9297 J9 AM J HUM GENET JI Am. J. Hum. Genet. PD SEP PY 1995 VL 57 IS 3 BP 651 EP 660 PG 10 WC Genetics & Heredity SC Genetics & Heredity GA RR605 UT WOS:A1995RR60500015 PM 7668294 ER PT J AU GALOISY, L CALAS, G BROWN, GE AF GALOISY, L CALAS, G BROWN, GE TI INTRACRYSTALLINE DISTRIBUTION OF NI IN SAN-CARLOS OLIVINE - AN EXAFS STUDY SO AMERICAN MINERALOGIST LA English DT Letter ID MG OLIVINE; CATION DISTRIBUTION; SILICATE OLIVINES; FE-MN; NICKEL; MELT; TEMPERATURE; FORSTERITE; FIELD; GLASS AB The location of minor amounts of Ni (0.44 wt% NiO) in the structure of San Carlos olivine has been determined using Ni K-edge fluorescence EXAFS spectroscopy. The mean Ni-O distance, d(Ni-O) = 2.08 Angstrom, suggests a preferential location of Ni in the M1 site. The observed distance is smaller than the Mg-O distance in the M1 site of alpha-Mg2SiO4 [mean d(M1-O) = 2.10 Angstrom] and is similar to the average M1-O distance in olivines close to the San Carlos composition [mean d(M1-O) = 2.09 Angstrom]. The most important relaxation effect resulting from the Ni for Mg substitution is a smaller mean M1-O distance. The medium-range distribution of Ni (up to 4.5 Angstrom from the central Ni atom) in the San Carlos olivine structure was estimated by modeling EXAFS spectra, considering various M1 and M2 cation distributions around M1 (Ni) sites. These models suggest medium-range ordering of Ni and Fe in adjacent M1 and M2 sites of the olivine structure and nonideal behavior of Ni in San Carlos olivine. C1 UNIV PARIS 07,F-75252 PARIS 05,FRANCE. IPGP,F-75252 PARIS 05,FRANCE. STANFORD UNIV,DEPT GEOL & ENVIRONM SCI,STANFORD,CA 94305. STANFORD UNIV,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94305. RP GALOISY, L (reprint author), UNIV PARIS 06,MINERAL CRISTALLOG LAB,CNRS,URA 09,F-75252 PARIS 05,FRANCE. RI Calas, Georges/B-2445-2012 OI Calas, Georges/0000-0003-0525-5734 NR 23 TC 19 Z9 19 U1 1 U2 6 PU MINERALOGICAL SOC AMER PI WASHINGTON PA 1130 17TH ST NW SUITE 330, WASHINGTON, DC 20036 SN 0003-004X J9 AM MINERAL JI Am. Miner. PD SEP-OCT PY 1995 VL 80 IS 9-10 BP 1089 EP 1092 PG 4 WC Geochemistry & Geophysics; Mineralogy SC Geochemistry & Geophysics; Mineralogy GA RY403 UT WOS:A1995RY40300030 ER PT J AU THORN, RJ AF THORN, RJ TI STABLE OR NOT SO AMERICAN SCIENTIST LA English DT Letter RP THORN, RJ (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU SIGMA XI-SCI RES SOC PI RES TRIANGLE PK PA PO BOX 13975, RES TRIANGLE PK, NC 27709 SN 0003-0996 J9 AM SCI JI Am. Scientist PD SEP-OCT PY 1995 VL 83 IS 5 BP 400 EP 400 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA RP020 UT WOS:A1995RP02000007 ER PT J AU ASANO, KG GOERINGER, DE MCLUCKEY, SA AF ASANO, KG GOERINGER, DE MCLUCKEY, SA TI PARALLEL MONITORING FOR MULTIPLE TARGETED COMPOUNDS BY ION-TRAP MASS-SPECTROMETRY SO ANALYTICAL CHEMISTRY LA English DT Article ID INVERSE FOURIER-TRANSFORM; EXCITATION; RANGE AB An approach to monitoring for the presence of several targeted compounds simultaneously using ion trap mass spectrometry is described. The use of tailored waveforms sequentially applied to the ion trap end-cap electrodes allows for mass-selective accumulation of multiple parent ions and simultaneous collisional activation of the ions. Further mass selection and ion activation steps can be performed to enhance specificity, The detection of trace explosives in air is used as an illustrative case in which 2,4-dinitrotoluene, 2,4,6-trinitrotoluene, and (2,4,6-trinitrophenyl)methylnitramine are targeted for detection. The parallel monitoring scheme trades specificity for advantages in speed and duty cycle relative to tandem mass spectrometry experiments performed in series. C1 OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. RI McLuckey, Scott/B-2203-2009; Asano, Keiji/L-3164-2016 OI McLuckey, Scott/0000-0002-1648-5570; Asano, Keiji/0000-0003-2254-3586 NR 19 TC 25 Z9 25 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD SEP 1 PY 1995 VL 67 IS 17 BP 2739 EP 2742 DI 10.1021/ac00113a003 PG 4 WC Chemistry, Analytical SC Chemistry GA RR260 UT WOS:A1995RR26000008 ER PT J AU VANBERKEL, GJ ZHOU, FM AF VANBERKEL, GJ ZHOU, FM TI CHARACTERIZATION OF AN ELECTROSPRAY ION-SOURCE AS A CONTROLLED-CURRENT ELECTROLYTIC CELL SO ANALYTICAL CHEMISTRY LA English DT Article ID IONIZATION MASS-SPECTROMETRY; MECHANISM; LIQUIDS; BIOMOLECULES; ATOMIZATION AB An electrospray (ES) ion source is described as a constant or controlled-current device for which the magnitude of the ES current is controlled by the rate of charged droplet production. Thus, the nature of the electrolytic process that occurs in the metal ES capillary to charge balance the loss of one ion polarity in the charged droplets is shown to be analogous to that of a controlled-current electrolytic (CCE) cell and controlled-current electrolysis carried out in a now cell. That is, the potential at the metal/solution interface in the ES capillary, which ultimately determines whether or nota particular species will undergo a redox reaction in the capillary, is a function of both the ES current and the relative redox potentials and concentrations of the various species in the solvent system, including the metal capillary. Furthermore, the extent to which one or more reactions occur is limited both by the ES current and by the now rate of the solvent system through the ES capillary. Experimental confirmation of the ES ion source as a CCE cell is made through experiments employing a novel ES ion source in which the effluent from the ES capillary enters the detection cell of a UV/visible diode array spectrophotometer prior to the spraying process. This ES setup allowed for the first time the detection of the products of the redox reactions in the ES capillary, while they were still in solution, thereby avoiding experimental complications imposed by the spraying process or by the subsequent mass analysis of the gas-phase ions that might complicate data interpretation. The analytical implications of the operation of the ES ion source as a CCE cell for neutral compound ionization and detection in ES-MS are briefly discussed. RP VANBERKEL, GJ (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831, USA. NR 31 TC 180 Z9 181 U1 0 U2 20 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD SEP 1 PY 1995 VL 67 IS 17 BP 2916 EP 2923 DI 10.1021/ac00113a028 PG 8 WC Chemistry, Analytical SC Chemistry GA RR260 UT WOS:A1995RR26000033 ER PT J AU STEMMLER, EA BUCHANAN, MV HURST, GB HETTICH, RL AF STEMMLER, EA BUCHANAN, MV HURST, GB HETTICH, RL TI ANALYSIS OF MODIFIED OLIGONUCLEOTIDES BY MATRIX-ASSISTED LASER DESORPTION/IONIZATION FOURIER-TRANSFORM MASS-SPECTROMETRY SO ANALYTICAL CHEMISTRY LA English DT Article ID FAST ATOM BOMBARDMENT; NUCLEIC-ACID CONSTITUENTS; DESORPTION IONIZATION; SEQUENCE-ANALYSIS; OLIGODEOXYRIBONUCLEOTIDES; OLIGODEOXYNUCLEOTIDES; DEOXYADENOSINE; ULTRAVIOLET; ADDUCT AB Matrix-assisted laser desorption/ionization (MALDI) Fourier transform ion cyclotron resonance mass spectrometry (FTMS) has been applied to the structural characterization of modified oligodeoxyribonucleotide 4-, 6-, and 11-mers. Each oligonucleotide contained one modified base, either an O-6-methyl-substituted guanine, an N-6-(10R)-trans- opened benzo[a]pyrenediol epoxide adduct of adenine, or an N-2-(R)-styrene oxide adduct of guanine. 3-Hydroxy-picolinic acid was used as the MALDI matrix for molecular weight and purity determinations, while either 2,5-dihydroxybenzoic acid (DHBA) or an anthranilic/nicotinic acid (AA/NA) mixture was used to induce fragmentation for the production of structurally significant fragment ions. For the 4- and 6-mers, the oligonucleotide sequence could be obtained from the direct AA/NA or DHBA spectra. Sequence information was also obtained by inserting a time delay between the laser desorption event and ion detection to permit metastable decomposition. For the 11-mers, high-mass sequence ions were not detected. Although similar sequence ions were observed in both the positive and the negative ion mass spectra, more fragmentation was generally observed in the positive ion mode. In the positive ion mode, modified base fragment ions were observed when DHBA was used, and these fragments were examined using accurate mass measurements, collisionally induced dissociations, and ion-molecule reactions to characterize the modified base. MALDI-FTMS signals from one sample application can be used for the measurement of hundreds of spectra. The direct MALDI-FT mass spectra show matrix-dependent, structurally informative fragments, and CID experiments can be implemented using low-picomole sample quantities. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP STEMMLER, EA (reprint author), BOWDOIN COLL,DEPT CHEM,BRUNSWICK,ME 04011, USA. RI Hettich, Robert/N-1458-2016; Buchanan, Michelle/J-1562-2016 OI Hettich, Robert/0000-0001-7708-786X; Buchanan, Michelle/0000-0002-8078-4575 FU NCI NIH HHS [YO1-CP-20512-13] NR 47 TC 44 Z9 44 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD SEP 1 PY 1995 VL 67 IS 17 BP 2924 EP 2930 DI 10.1021/ac00113a029 PG 7 WC Chemistry, Analytical SC Chemistry GA RR260 UT WOS:A1995RR26000034 PM 8779417 ER PT J AU SHI, YC FRITZ, JS AF SHI, YC FRITZ, JS TI HPCZE OF NONIONIC COMPOUNDS USING A NOVEL ANIONIC SURFACTANT ADDITIVE SO ANALYTICAL CHEMISTRY LA English DT Article ID ELECTROKINETIC CAPILLARY CHROMATOGRAPHY; ZONE ELECTROPHORESIS; SEPARATION AB Excellent separations of nonionic organic compounds were obtained by adding sodium dioctyl sulfosuccinate (DOSS) to an acetonitrile (similar to 40% v/v)-water electrolyte. Separation is based on differences in the strength of analyte-DOSS association ''complexes'' in solution, which results in differences in effective electrophoretic mobility. Micelle formation is not believed to occur. The effects of varying apparent pH, applied voltage, acetonitrile concentration, and DOSS concentration were studied with regard to electroosmotic mobility and effective electrophoretic mobility. Under optimum conditions, excellent separations of 23 organic compounds were obtained. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP SHI, YC (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 23 TC 52 Z9 52 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD SEP 1 PY 1995 VL 67 IS 17 BP 3023 EP 3027 DI 10.1021/ac00113a042 PG 5 WC Chemistry, Analytical SC Chemistry GA RR260 UT WOS:A1995RR26000047 ER PT J AU XUN, LY WAGNON, KB AF XUN, LY WAGNON, KB TI PURIFICATION AND PROPERTIES OF COMPONENT-B OF 2,4,5-TRICHLOROPHENOXYACETATE OXYGENASE FROM PSEUDOMONAS-CEPACIA AC1100 SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY LA English DT Note ID BIODEGRADATION; PROTEINS; ACID AB Pseudomonas cepacia AC1100 degrades 2,4,5-trichlorophenoxyacetate (2,4,5-T), an herbicide and chlorinated aromatic compound. Although some progress has been made in understanding 2,4,5-T degradation by AC1100 by molecular analysis, little is known about the biochemistry involved. Enzymatic activity converting 2,4,5-T to 2,4,5-trichlorophenol in the presence of NADH and O-2 was detected in cell extracts of AC1100. Phenyl agarose chromatography of the ammonium sulfate-fractionated cell extracts yielded no active single fractions, but the mixing of two fractions, named component A and component B, resulted in the recovery of enzyme activity. Component B was further purified to homogeneity by hydroxyapatite and DEAE chromatographies. Component B had a native molecular weight of 140,000, and it was composed of two 49-kDa alpha-subunits and two 24-kDa beta-subunits. Component B was red, and its spectrum in the visible region had maxima at 430 and 560 nm (shoulder), whereas upon reduction it had maxima at 420 (shoulder) and 530 nm. Each mole of alpha beta heterodimer contained 2.9 mol of iron and 2.1 mol of labile sulfide. These properties suggest strong similarities between component B and the terminal oxygenase components of the aromatic ring-hydroxylating dioxygenases. Component A was highly purified but not to homogeneity. The reconstituted 2,4,5-T oxygenase, consisting of components A and B, converted 2,4,5-T quantitatively into 2,4,5-trichlorophenol and glyoxylate with the coconsumption of NADH and O-2. C1 PACIFIC NW LAB, ENVIRONM MICROBIOL GRP, RICHLAND, WA 99352 USA. RP XUN, LY (reprint author), WASHINGTON STATE UNIV, DEPT MICROBIOL, RICHLAND, WA 99352 USA. NR 20 TC 27 Z9 28 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0099-2240 J9 APPL ENVIRON MICROB JI Appl. Environ. Microbiol. PD SEP PY 1995 VL 61 IS 9 BP 3499 EP 3502 PG 4 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA RT798 UT WOS:A1995RT79800053 PM 16535134 ER PT J AU ALLISON, SW BOATNER, LA GILLIES, GT AF ALLISON, SW BOATNER, LA GILLIES, GT TI CHARACTERIZATION OF HIGH-TEMPERATURE THERMOGRAPHIC PHOSPHORS - SPECTRAL PROPERTIES OF LUPO4-DY(1-PERCENT),EU(2-PERCENT) SO APPLIED OPTICS LA English DT Article AB The fluorescence properties of a thermographic phosphor in the form of single crystals of LuPO4: Dy(1%),Eu(2%) have been studied as a function of temperature by the use of a high-temperature oven integrated into a spectrophotometer. The results reveal differing rates of decrease in the fluorescence intensity with increasing temperature for various emission lines of dysprosium and europium, thus suggesting a new differential method of remote thermometry for high-temperature applications and for temperature measurements on moving components. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. UNIV VIRGINIA,DEPT MECH AEROSP & NUCL ENGN,CHARLOTTESVILLE,VA 22901. RP ALLISON, SW (reprint author), OAK RIDGE NATL LAB,DIV ENGN TECHNOL,OAK RIDGE,TN 37831, USA. NR 13 TC 37 Z9 37 U1 2 U2 6 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD SEP 1 PY 1995 VL 34 IS 25 BP 5624 EP 5627 PG 4 WC Optics SC Optics GA RR044 UT WOS:A1995RR04400009 PM 21060389 ER PT J AU PAYNE, SA MARSHALL, CD BAYRAMIAN, A WILKE, GD HAYDEN, JS AF PAYNE, SA MARSHALL, CD BAYRAMIAN, A WILKE, GD HAYDEN, JS TI LASER PROPERTIES OF A NEW AVERAGE-POWER ND-DOPED PHOSPHATE-GLASS SO APPLIED PHYSICS B-LASERS AND OPTICS LA English DT Article ID EFFICIENCY AB The Nd-doped phosphate laser glass described herein can withstand 2.3 times greater thermal loading without fracture, compared to APG-1 (commercially available Average-Power Glass from Schott Glass Technologies). The enhanced thermal loading capability is established on the basis of the intrinsic thermomechanical properties (expansion, conduction, fracture toughness, and Young's modulus), and by direct thermally induced fracture experiments using Ar-ion laser heating of the samples. This Nd-doped phosphate glass (referred to as APG-t) is found to be characterized by a 29% lower gain cross section and a 25% longer low-concentration emission lifetime. Other measurements pertaining to the concentration quenching, thermal lensing, and saturation of the extraction are also described in this article. It is noteworthy that APG-t offers increased bandwidth near the peak of the 1054 nm gain spectrum, suggesting that this material may have special utility as a means of generating and amplifying ultrashort pulses of light. C1 SCHOTT GLASS TECHNOL INC,DURYEA,PA 18642. RP PAYNE, SA (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5508,LIVERMORE,CA 94550, USA. NR 28 TC 31 Z9 31 U1 1 U2 10 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0946-2171 J9 APPL PHYS B-LASERS O JI Appl. Phys. B-Lasers Opt. PD SEP PY 1995 VL 61 IS 3 BP 257 EP 266 DI 10.1007/BF01082045 PG 10 WC Optics; Physics, Applied SC Optics; Physics GA RR917 UT WOS:A1995RR91700005 ER PT J AU FISHER, WG STOREY, JME SHARP, SL JANKE, CJ WACHTER, EA AF FISHER, WG STOREY, JME SHARP, SL JANKE, CJ WACHTER, EA TI NONDESTRUCTIVE INSPECTION OF GRAPHITE-EPOXY COMPOSITES FOR HEAT DAMAGE USING LASER-INDUCED FLUORESCENCE SO APPLIED SPECTROSCOPY LA English DT Article DE FIBER-REINFORCED COMPOSITES; PMCS; LASER-INDUCED FLUORESCENCE; LIF; THERMAL DAMAGE; NDE AB Laser-induced fluorescence has been applied to the nondestructive inspection of graphite-fiber-reinforced polymer-matrix composites. Upon curing, the epoxy resin in these materials forms a highly cross-linked network of aromatic sub-units. This result yields a material with significant absorptivity from the ultraviolet through the near-infrared and a fluorescence bandwidth covering 200 to 300 nm. When subjected to temperatures beyond the recommended upper service temperature, these materials experience thermally induced degradation and a reduction in mechanical strength. Furthermore, these heat-damaged materials exhibit significant changes in fluorescence intensity and in the wavelength of maximum fluorescence intensity. These spectroscopic changes can be correlated with the extent of heat damage. An imaging approach has been developed to monitor these fluorescence signatures, allowing rapid nondestructive inspection of large surface areas. This capability provides qualitative and quantitative information about the location and severity of damage. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RI Janke, Christopher/E-1598-2017 OI Janke, Christopher/0000-0002-6076-7188 NR 8 TC 10 Z9 10 U1 2 U2 9 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA PO BOX 1438, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD SEP PY 1995 VL 49 IS 9 BP 1225 EP 1231 DI 10.1366/0003702953965263 PG 7 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA RW317 UT WOS:A1995RW31700004 ER PT J AU TENG, JW BARSHICK, CM DUCKWORTH, DC MORTON, SJ SMITH, DH KING, FL AF TENG, JW BARSHICK, CM DUCKWORTH, DC MORTON, SJ SMITH, DH KING, FL TI FACTORS INFLUENCING THE QUANTITATIVE-DETERMINATION OF TRACE-ELEMENTS IN SOILS BY GLOW-DISCHARGE MASS-SPECTROMETRY SO APPLIED SPECTROSCOPY LA English DT Article DE GLOW DISCHARGE MASS SPECTROMETRY; INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY; INDUCTIVELY COUPLED PLASMA ATOMIC EMISSION SPECTROMETRY; SOIL ANALYSIS; GEOLOGICAL ANALYSIS; RELATIVE SENSITIVITY FACTORS AB The influence of oxygen content, conducting host matrix, and soil composition on the quantitative determination of trace elements in soils by glow discharge mass spectrometry was examined, Oxygen content and conducting host matrix identity influenced relative sensitivity factors employed in the quantitative interpretation of the glow discharge mass spectra, Soil composition did not influence these relative sensitivity factors. Unknown soils taken from the field were analyzed with the use of a set of relative sensitivity factors obtained from standard soils with certified compositions, The quantitative results from glow discharge mass spectrometry of these unknowns compared favorably with quantitative results from inductively coupled plasma atomic emission spectrometry and laser ablation solid sampling inductively coupled plasma mass spectrometry. C1 W VIRGINIA UNIV,DEPT CHEM,MORGANTOWN,WV 26506. OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. RI Duckworth, Douglas/B-7171-2015 OI Duckworth, Douglas/0000-0002-8161-5685 NR 17 TC 22 Z9 22 U1 0 U2 3 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA PO BOX 1438, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD SEP PY 1995 VL 49 IS 9 BP 1361 EP 1366 DI 10.1366/0003702953965380 PG 6 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA RW317 UT WOS:A1995RW31700023 ER PT J AU RUSSO, RE AF RUSSO, RE TI LASER-ABLATION SO APPLIED SPECTROSCOPY LA English DT Review ID ELEMENTAL ANALYSIS; SOLID MATERIALS; SPECTROMETRY; VAPORIZATION; WAVELENGTH; DEPOSITION RP RUSSO, RE (reprint author), UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. NR 37 TC 115 Z9 116 U1 1 U2 22 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 5320 SPECTRUM DRIVE SUITE C, FREDERICK, MD 21703 USA SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD SEP PY 1995 VL 49 IS 9 BP A14 EP A28 PG 15 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA RW317 UT WOS:A1995RW31700002 ER PT J AU WEDEEN, RP TY, A UDASIN, I FAVATA, EA JONES, KW AF WEDEEN, RP TY, A UDASIN, I FAVATA, EA JONES, KW TI CLINICAL-APPLICATION OF IN-VIVO TIBIAL K-XRF FOR MONITORING LEAD STORES SO ARCHIVES OF ENVIRONMENTAL HEALTH LA English DT Article ID X-RAY-FLUORESCENCE; BONE LEAD; NEPHROPATHY; HYPERTENSION; CHELATION; EXPOSURE; CHILDREN AB We used in vivo tibial K-x-ray fluorescence for clinical evaluation of bone lead stores in 31 patients suspected of excessive lead absorption. Four clinical situations were examined: (1) postchelation therapy, (2) renal failure, (3) home exposure, and (4) occupational exposure. K-x-ray fluorescence assisted in determining the magnitude of body lead stoves in patients with known excessive lead exposure. Serial measurements revealed a reduction in bone lead that occurred over the years, during which there was an absence of continued exposure; this reduction occurred more rapidly during chelation therapy. Sustained high bone lead levels following chelation therapy in two children were consistent with elevated lead stores from prior pica. In a patient with renal failure, K-x-ray fluorescence demonstrated massive lead stores at a time when chelation testing was not possible. In other cases, bone lead levels indicated the possible contribution of lead nephropathy to renal diseases of other etiologies. In individuals exposed to lead during home renovations, K-x-ray fluorescence provided reassurance that past exposure did not result in elevated body lead stores decades later. In the occupational setting, K-x-ray fluorescence documented cumulative lead stores in workers whose exposures varied in intensity and duration. The examples discussed here show how physicians can use K-x-ray fluorescence to deal with practical questions of patient management. As the test becomes more generally available, its safety, specificity, and simplicity should make it an important alternative to cumbersome chelation tests and potentially misleading blood lead measurements. C1 UNIV MED & DENT NEW JERSEY,NEW JERSEY MED SCH,DEPT MED,NEWARK,NJ 07103. UNIV MED & DENT NEW JERSEY,NEW JERSEY MED SCH,DEPT PREVENT MED & COMMUNITY HLTH,NEWARK,NJ 07103. UNIV MED & DENT NEW JERSEY,NEW JERSEY MED SCH,DEPT RADIOL,NEWARK,NJ 07103. UNIV MED & DENT NEW JERSEY,ROBERT WOOD JOHNSON MED SCH,DEPT OCCUPAT MED,PISCATAWAY,NJ 08854. OCCUPAT & ENVIRONM HLTH INST,PISCATAWAY,NJ. BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. UNIV MED & DENT NEW JERSEY,ROBERT WOOD JOHNSON MED SCH,DEPT PEDIAT,PISCATAWAY,NJ 08854. RP WEDEEN, RP (reprint author), VET ADM MED CTR,RES SERV,E ORANGE,NJ 07018, USA. NR 17 TC 10 Z9 12 U1 0 U2 0 PU HELDREF PUBLICATIONS PI WASHINGTON PA 1319 EIGHTEENTH ST NW, WASHINGTON, DC 20036-1802 SN 0003-9896 J9 ARCH ENVIRON HEALTH JI Arch. Environ. Health PD SEP-OCT PY 1995 VL 50 IS 5 BP 355 EP 361 PG 7 WC Environmental Sciences; Public, Environmental & Occupational Health SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health GA TA996 UT WOS:A1995TA99600005 PM 7574889 ER PT J AU BENNETT, C AF BENNETT, C TI SOLAR-THERMAL TECHNOLOGY - HOW TO IDENTIFY COST-EFFECTIVE APPLICATIONS SO ASHRAE JOURNAL-AMERICAN SOCIETY OF HEATING REFRIGERATING AND AIR-CONDITIONING ENGINEERS LA English DT Article RP BENNETT, C (reprint author), SANDIA NATL LABS,CTR SOLAR THERMAL ASSISTANCE,ALBUQUERQUE,NM 87185, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC HEAT REFRIG AIR- CONDITIONING ENG INC PI ATLANTA PA 1791 TULLIE CIRCLE NE, ATLANTA, GA 30329 SN 0001-2491 J9 ASHRAE J JI ASHRAE J.-Am. Soc. Heat Refrig. Air-Cond. Eng. PD SEP PY 1995 VL 38 IS 9 BP 44 EP & PG 0 WC Thermodynamics; Construction & Building Technology; Engineering, Mechanical SC Thermodynamics; Construction & Building Technology; Engineering GA RV398 UT WOS:A1995RV39800010 ER PT J AU GREGG, MD AF GREGG, MD TI THE INFRARED DIAMETER-VELOCITY DISPERSION-RELATION FOR ELLIPTIC GALAXIES SO ASTRONOMICAL JOURNAL LA English DT Article ID SURFACE-BRIGHTNESS FLUCTUATIONS; COLOR MAGNITUDE RELATION; DN-SIGMA RELATION; PRECISION PHOTOMETRY; STELLAR POPULATIONS; FUNDAMENTAL PLANE; HUBBLE CONSTANT; VIRGO CLUSTERS; DISTANCE; SPECTROSCOPY AB Using single channel K -band photometric data from the literature, a provisional infrared diameter-velocity dispersion relation for elliptical galaxies in the Coma and Virgo clusters is derived. The Coma cluster relation has similar to 1.5 times lower scatter at K band than in B or V. Excluding 4 outliers, the rms scatter at K for 24 galaxies in Coma is only 4.8% in distance, close to the limit implied by the observational errors. Distance estimates based on the IR D-sigma relation will be more accurate than those derived from optical data. The improvement in the infrared is attributed to a decrease in sensitivity to stellar population parameters (age, metallicity, and slope of the IMF), as well as lower internal extinction from dust compared to the optical. That the D-sigma relation has a larger scatter in the optical indicates that there are detectable, but small, stellar population or dust content differences among the Coma ellipticals. Since the D-sigma relations are based on the fundamental plane, this result promises that the fundamental plane is thinner in the infrared than it is in the optical. Infrared photometric data available for Virgo are limited to just 13 objects; the spread in distance due to the depth of the cluster precludes any significant improvement over B and V. A relative Coma-Virgo distance of 5.56 is derived from the K band data, in agreement with estimates in other colors and using other techniques, indicating that there is no significant age difference between Virgo and Coma ellipticals. (C) 1995 American Astronomical Society. RP GREGG, MD (reprint author), LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,L-413,7200 EAST AVE,LIVERMORE,CA 94550, USA. NR 35 TC 4 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD SEP PY 1995 VL 110 IS 3 BP 1052 EP 1058 DI 10.1086/117585 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RR927 UT WOS:A1995RR92700010 ER PT J AU GOOBAR, A PERLMUTTER, S AF GOOBAR, A PERLMUTTER, S TI FEASIBILITY OF MEASURING THE COSMOLOGICAL CONSTANT-LAMBDA AND MASS-DENSITY-OMEGA USING TYPE IA SUPERNOVAE SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMOLOGY, OBSERVATIONS; DISTANCE SCALE; SUPERNOVAE, GENERAL AB We explore the feasibility of resurrecting the apparent magnitude-redshift relation for a ''standard candle'' to measure the cosmological constant and mass density. We show that Type Ia supernovae, if measured with 0.15 mag uncertainty out to a redshift of z = 1, may provide a good standard candle or calibrated candle for this purpose. The recent discovery of probable Type Ia supernovae in the redshift range z = 0.3-0.5 (Perlmutter et al. 1994, 1995) indicates that the flux of optical photons from these events can be measured this accurately. The seven distant supernovae discovered to date do not by themselves distinguish among different cosmological models; however, the further discovery of about 50 Type Ia supernovae at redshifts in the range 0.5 less than or equal to z less than or equal to 1.0 could strongly constrain the allowed range of these parameters. We estimate that the follow-up photometry necessary for this measurement would be on the order of 20-70 hr of time on a 10 m class telescope at a site with good seeing. C1 UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP GOOBAR, A (reprint author), UNIV STOCKHOLM,DEPT PHYS,BOX 6730,S-11385 STOCKHOLM,SWEDEN. RI Perlmutter, Saul/I-3505-2015 OI Perlmutter, Saul/0000-0002-4436-4661 NR 26 TC 121 Z9 122 U1 0 U2 3 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 1 PY 1995 VL 450 IS 1 BP 14 EP 18 DI 10.1086/176113 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RQ577 UT WOS:A1995RQ57700002 ER PT J AU GLENDENNING, NK KETTNER, C WEBER, F AF GLENDENNING, NK KETTNER, C WEBER, F TI FROM STRANGE STARS TO STRANGE DWARFS SO ASTROPHYSICAL JOURNAL LA English DT Article DE DENSE MATTER; ELEMENTARY PARTICLES; STARS, INTERIORS; STARS, NEUTRON; WHITE DWARFS ID HEAVY-ION COLLISIONS; QUARK-MATTER DROPLETS; GROUND-STATE; MODELS; PULSAR; SEPARATION; EQUATION; DROPS; HALO AB We determine all possible equilibrium sequences of compact strange-matter stars with nuclear crusts, which range from massive strange stars to strange white dwarf-like objects (strange dwarfs). The properties of such stars are compared with those of their nonstrange counterparts-neutron stars and ordinary white dwarfs. The main emphasis of this paper is on strange dwarfs, which we divide into two distinct categories. The first one consists of a core of strange matter enveloped within ordinary white dwarf matter. Such stars are hydrostatically stable with or without the strange core and are therefore referred to as ''trivial'' strange dwarfs. This is different for the second category which forms an entirely new class of dwarf stars that contain nuclear material up to similar to 4 x 10(4) times denser than in ordinary white dwarfs of average mass, M similar to 0.6 M., and still about 400 times denser than in the densest white dwarfs. The entire family of such dwarfs, denoted dense strange dwarfs, owes its hydrostatic stability to the strange core. One of the striking features of strange dwarfs is that the entire sequence from the maximum-mass strange star to the maximum-mass strange dwarf is stable to radial oscillations. The minimum-mass star is only conditionally stable, and the sequences on both sides are stable. Such a stable, continuous connection does not exist between ordinary white dwarfs and neutron stars, which are known to be separated by a broad range of unstable stars. As a result, we find an expansive range of very low mass (planetary-like) strange-matter stars (masses even below similar to 10(-4) M. are possible) that arise as natural dark-matter candidates, which if abundant enough in our Galaxy, should be seen in the gravitational microlensing searches that are presently being performed. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, INST NUCL & PARTICLE ASTROPHYS, BERKELEY, CA 94720 USA. RP GLENDENNING, NK (reprint author), UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV NUCL SCI, MS 70A-3307, BERKELEY, CA 94720 USA. NR 47 TC 58 Z9 59 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 1 PY 1995 VL 450 IS 1 BP 253 EP 261 DI 10.1086/176136 PN 1 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RQ577 UT WOS:A1995RQ57700025 ER PT J AU KAWALER, SD OBRIEN, MS CLEMENS, JC NATHER, RE WINGET, DE WATSON, TK YANAGIDA, K DIXSON, JS BRADLEY, PA WOOD, MA SULLIVAN, DJ KLEINMAN, SJ MEISTAS, E LEIBOWITZ, EM MOSKALIK, P ZOLA, S PAJDOSZ, G KRZESINSKI, J SOLHEIM, JE BRUVOLD, A ODONOGHUE, D KATZ, M VAUCLAIR, G DOLEZ, N CHEVRETON, M BARSTOW, MA KANAAN, A KEPLER, SO GIOVANNINI, O PROVENCAL, JL HANSEN, CJ AF KAWALER, SD OBRIEN, MS CLEMENS, JC NATHER, RE WINGET, DE WATSON, TK YANAGIDA, K DIXSON, JS BRADLEY, PA WOOD, MA SULLIVAN, DJ KLEINMAN, SJ MEISTAS, E LEIBOWITZ, EM MOSKALIK, P ZOLA, S PAJDOSZ, G KRZESINSKI, J SOLHEIM, JE BRUVOLD, A ODONOGHUE, D KATZ, M VAUCLAIR, G DOLEZ, N CHEVRETON, M BARSTOW, MA KANAAN, A KEPLER, SO GIOVANNINI, O PROVENCAL, JL HANSEN, CJ TI WHOLE EARTH TELESCOPE OBSERVATIONS AND SEISMOLOGICAL ANALYSIS OF THE PRE-WHITE DWARF PG-2131+066 SO ASTROPHYSICAL JOURNAL LA English DT Article DE STARS, FUNDAMENTAL PARAMETERS; STARS, INDIVIDUAL (PG 2131 + 066); STARS, OSCILLATIONS; WHITE DWARFS ID HOT AB As transition objects between the asymptotic giant branch (AGE) and cooling white dwarfs, the PG 1159 stars are key objects for understanding the late stages of stellar evolution. The pulsations exhibited by many members of the PG 1159 spectral class provide a mechanism for ferreting out this information, We present an analysis of the pulsation spectrum of the naked PG 1159 star PG 2131+066, which we completely resolve using data from the Whole Earth Telescope (WET). The pulsation spectrum shows patterns that are expected from pulsation theory; comparison of these patterns with theoretical models indicate that PG 2131 has a mass of 0.61 +/- 0.02 M., a luminosity of log (L/L.) = 1.0 +/- 0.2, and it lies at a distance of 470(-130)(+180) pc. It rotates with a period of 5.1 hr and shows evidence of a discontinuity in composition approximately 6 x 10(-31)M* below the surface. Certain modes show complex structure in the power spectrum, while others show measurable frequency changes in 8 years. Fine structure in the prograde (m = -1) modes suggests the presence of nonlinear effects. C1 UNIV TEXAS,DEPT ASTRON,AUSTIN,TX 78712. UNIV CALIF LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. FLORIDA INST TECHNOL,DEPT PHYS & SPACE SCI,MELBOURNE,FL 32901. INST ASTRON,HONOLULU,HI. UNIV VICTORIA,DEPT PHYS,WELLINGTON,NEW ZEALAND. INST THEORET PHYS & ASTRON,VILNIUS 2600,LITHUANIA. TEL AVIV UNIV,DEPT PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. COPERNICUS ASTRON CTR,PL-00716 WARSAW,POLAND. KRAKOW PEDAGOG UNIV,MT SUHORA OBSERV,PL-30084 KRAKOW,POLAND. JAGIELLONIAN UNIV,ASTRON OBSERV,PL-30244 KRAKOW,POLAND. UNIV TROMSO,INST MATEMAT REALFAG,N-9000 TROMSO,NORWAY. UNIV CAPE TOWN,DEPT ASTRON,RONDEBOSCH 7700,SOUTH AFRICA. OBSERV MIDI PYRENEES,F-31400 TOULOUSE,FRANCE. OBSERV PARIS,F-92195 MEUDON,FRANCE. UNIV LEICESTER,DEPT PHYS,LEICESTER LE1 7RH,LEICS,ENGLAND. ISAAC NEWTON TELESCOPE,ROQUE LOS MUCHACHOS,LA PALMA,SPAIN. UNIV FED RIO GRANDE SUL,INST FIS,BR-91501970 PORTO ALEGRE,RS,BRAZIL. CNPQ,NACL ASTROFIS LAB,RIO JANEIRO,BRAZIL. UNIV DELAWARE,SHARP LAB,DEPT PHYS & ASTRON,NEWARK,DE 19716. UNIV COLORADO,JILA,BOULDER,CO 80309. RP KAWALER, SD (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011, USA. RI Kepler, S. O. /H-5901-2012; OI Kepler, S. O. /0000-0002-7470-5703; Kawaler, Steven/0000-0002-6536-6367 NR 18 TC 51 Z9 51 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 1 PY 1995 VL 450 IS 1 BP 350 EP 363 DI 10.1086/176145 PN 1 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RQ577 UT WOS:A1995RQ57700034 ER PT J AU FILIPPENKO, AV BARTH, AJ MATHESON, T ARMUS, L BROWN, M ESPEY, BR FAN, XM GOODRICH, RW HO, LC JUNKKARINEN, VT KOO, DC LEHNERT, MD MARTEL, AR MAZZARELLA, JM MILLER, JS SMITH, GH TYTLER, D WIRTH, GD AF FILIPPENKO, AV BARTH, AJ MATHESON, T ARMUS, L BROWN, M ESPEY, BR FAN, XM GOODRICH, RW HO, LC JUNKKARINEN, VT KOO, DC LEHNERT, MD MARTEL, AR MAZZARELLA, JM MILLER, JS SMITH, GH TYTLER, D WIRTH, GD TI THE TYPE-IC SUPERNOVA 1994I IN M51 - DETECTION OF HELIUM AND SPECTRAL EVOLUTION SO ASTROPHYSICAL JOURNAL LA English DT Article DE BINARIES, CLOSE; STARS, EVOLUTION; STARS, MASS LOSS; SUPERNOVAE, GENERAL; SUPERNOVAE, INDIVIDUAL (SN 1994I, SN 1987M, SN 1984L) ID IB SUPERNOVAE; PHASE AB We present a series of spectra of SN 1994I in M51, starting 1 week prior to maximum brightness. The nebular phase began about 2 months after the explosion; together with the rapid decline of the optical light, this suggests that the ejected mass was small. Although lines of He I in the optical region are weak or absent, consistent with the Type Ic classification, we detect strong He I lambda 10830 absorption during the first month past maximum. Thus, if SN 1994I is a typical Type Ic supernova, the atmospheres of these objects cannot be completely devoid of helium. The emission-line widths are smaller than predicted by the model of Nomoto and coworkers, in which the iron core of a low-mass carbon-oxygen star collapses. They are, however, larger than in Type Ib supernovae. C1 UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720. JOHNS HOPKINS UNIV,CTR ASTROPHYS SCI,BALTIMORE,MD 21218. UNIV CALIF SAN DIEGO,CTR SPACE SCI & ASTROPHYS,SAN DIEGO,CA 92093. UNIV CALIF SANTA CRUZ,LICK OBSERV,SANTA CRUZ,CA 95064. LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. CALTECH,CTR INFRARED PROC & ANAL,PASADENA,CA 91125. RP FILIPPENKO, AV (reprint author), UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720, USA. OI Mazzarella, Joseph/0000-0002-8204-8619; Barth, Aaron/0000-0002-3026-0562 NR 27 TC 100 Z9 101 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 1 PY 1995 VL 450 IS 1 BP L11 EP L15 PN 2 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RQ580 UT WOS:A1995RQ58000003 ER PT J AU RHIE, SH BENNETT, D AF RHIE, SH BENNETT, D TI MATCH PROBABILITY-STATISTICS AND GAMMA-RAY BURST RECURRENCES IN THE BATSE CATALOG SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT 29th ESLAB Symposium on Towards the Source of Gamma-Ray Bursts CY APR 26-28, 1995 CL EUROPEAN SPACE RES & TECHNOL CTR, NOORDWIJK, NETHERLANDS SP ESLAB, ESTEC HO EUROPEAN SPACE RES & TECHNOL CTR DE GAMMA RAY BURSTS; RECURRENCES AB We develop match probability statistics to test the recurrences of gamma-ray bursts in the BATSE catalog 1B and 2B. We do not find a signal of repetitions at the match level of 10(-3). RP RHIE, SH (reprint author), LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD SEP PY 1995 VL 231 IS 1-2 BP 27 EP 30 DI 10.1007/BF00658582 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TF267 UT WOS:A1995TF26700007 ER PT J AU PALMER, DM TEEGARDEN, BJ SEIFERT, H GEHRELS, N CLINE, TL RAMATY, R OWENS, A HURLEY, K MADDEN, N PEHL, R AF PALMER, DM TEEGARDEN, BJ SEIFERT, H GEHRELS, N CLINE, TL RAMATY, R OWENS, A HURLEY, K MADDEN, N PEHL, R TI FIRST RESULTS FROM THE TGRS HIGH-RESOLUTION GRB SPECTROMETER SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT 29th ESLAB Symposium on Towards the Source of Gamma-Ray Bursts CY APR 26-28, 1995 CL EUROPEAN SPACE RES & TECHNOL CTR, NOORDWIJK, NETHERLANDS SP ESLAB, ESTEC HO EUROPEAN SPACE RES & TECHNOL CTR DE GRBS; HIGH RESOLUTION SPECTROSCOPY; SOLID STATE DETECTORS ID GAMMA-RAY BURSTS; CYCLOTRON AB The Transient Gamma Ray Spectrometer (TGRS) is a 215 cm(3) passively-cooled germanium detector designed primarily to study spectral features of gamma ray bursts. Since shortly after its launch on 1994 Nov. 1 it has been producing high-resolution spectra of GRBs and solar flares. Some of these spectra are presented here. Although it has not yet detected any line features in GRBs-none were expected so early in the mission-several bursts have been seen simultaneously by TGRS, the Konus instruments on the same spacecraft, and the BATSE instrument on Compton GRO. A comparison of the spectra obtained by these various instruments, as presented here, may resolve the question of whether line features actually exist, and if so provide detailed spectroscopy to determine their physical origin. C1 UNIV SPACE RES ASSOC,WASHINGTON,DC. UNIV CALIF BERKELEY,BERKELEY,CA 94720. UNIV LEICESTER,LEICESTER LE1 7RH,LEICS,ENGLAND. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP PALMER, DM (reprint author), NASA,GODDARD SPACE FLIGHT CTR,CODE 661,GREENBELT,MD 20771, USA. RI Gehrels, Neil/D-2971-2012 NR 4 TC 1 Z9 1 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD SEP PY 1995 VL 231 IS 1-2 BP 161 EP 164 DI 10.1007/BF00658608 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TF267 UT WOS:A1995TF26700033 ER PT J AU AKERLOF, C ABLES, E BARTHELMY, S BIONTA, R CLINE, T FERGUSON, D FISHMAN, G GEHRELS, N KOUVELIOTOU, C LEE, B MEEGAN, C OTT, L PARK, HS PARKER, E AF AKERLOF, C ABLES, E BARTHELMY, S BIONTA, R CLINE, T FERGUSON, D FISHMAN, G GEHRELS, N KOUVELIOTOU, C LEE, B MEEGAN, C OTT, L PARK, HS PARKER, E TI RESULTS FROM GROCSE, A REAL-TIME SEARCH FOR THE OPTICAL COUNTERPARTS OF GAMMA-RAY BURSTS SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT 29th ESLAB Symposium on Towards the Source of Gamma-Ray Bursts CY APR 26-28, 1995 CL EUROPEAN SPACE RES & TECHNOL CTR, NOORDWIJK, NETHERLANDS SP ESLAB, ESTEC HO EUROPEAN SPACE RES & TECHNOL CTR AB The GROCSE Collaboration (Gamma-Ray Optical Counterpart Search Experiment) has been operating a rapid response camera since January 1994 in an attempt to capture optical images of GRB events. This detector has a response time of 15 seconds and a limiting magnitude of 8. A second generation detector is now under construction which is expected to eventually reach m(v) similar or equal to 15 with a 5 second exposure. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. EARTHWATCH INC,LIVERMORE,CA 94550. NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812. RP AKERLOF, C (reprint author), UNIV MICHIGAN,DEPT PHYS,ANN ARBOR,MI 48109, USA. RI Barthelmy, Scott/D-2943-2012; Gehrels, Neil/D-2971-2012 NR 5 TC 4 Z9 4 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD SEP PY 1995 VL 231 IS 1-2 BP 255 EP 258 DI 10.1007/BF00658627 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TF267 UT WOS:A1995TF26700052 ER PT J AU YOSHIDA, A MATSUOKA, M KAWAI, N TOKANAI, F TZAND, JJMI FENIMORE, EE GALASSI, M YAMAUCHI, M TAKAGISHI, K HATSUKADE, I AF YOSHIDA, A MATSUOKA, M KAWAI, N TOKANAI, F TZAND, JJMI FENIMORE, EE GALASSI, M YAMAUCHI, M TAKAGISHI, K HATSUKADE, I TI WIDE-FIELD X-RAY MONITOR ON BOARD THE HIGH-ENERGY TRANSIENT EXPERIMENT (HETE) SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT 29th ESLAB Symposium on Towards the Source of Gamma-Ray Bursts CY APR 26-28, 1995 CL EUROPEAN SPACE RES & TECHNOL CTR, NOORDWIJK, NETHERLANDS SP ESLAB, ESTEC HO EUROPEAN SPACE RES & TECHNOL CTR DE INSTRUMENTS; GAMMA-RAY BURSTS; X-RAY EMISSION ID ABSORPTION; FEATURES; BURSTS; GINGA AB The High-Energy Transient Experiment (HETE) is designed for the multi-wavelengths study of Gamma-Ray Bursts (GRBs) in UV, X-ray and gamma-ray range with three scientific instruments. The X-ray instrument, Wide-field X-ray Monitor (WXM), consists of four units of one-dimensional position sensitive gas proportional counters and two perpendicularly oriented one-dimensional coded apertures. The WXM has a wide FOV of 1.5 steradian together with the capability to locate GRBs with similar to 10 arcmin accuracy, and covers photon energies of 2 to 25 keV with an energy resolution of typically similar to 18 % at 6 keV, measuring wide band spectra together with the gamma-ray spectrometer (FREGATE). The coded X-ray image will be deconvolved on board and the GRB location will be provided to the UV camera within similar to 1 sec. GRB locations will also be broadcast in ''real time'' to ground-based observers for follow-up observations. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM. MIYAZAKI UNIV,MIYAZAKI,JAPAN. RP YOSHIDA, A (reprint author), INST PHYS & CHEM RES,2-1 HIROSAWA,WAKO,SAITAMA,JAPAN. NR 11 TC 5 Z9 5 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD SEP PY 1995 VL 231 IS 1-2 BP 463 EP 466 DI 10.1007/BF00658671 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TF267 UT WOS:A1995TF26700096 ER PT J AU SEIFERT, H TEEGARDEN, BJ PALMER, D GEHRELS, N CLINE, TL RAMATY, R OWENS, A HURLEY, K PEHL, R MADDEN, N AF SEIFERT, H TEEGARDEN, BJ PALMER, D GEHRELS, N CLINE, TL RAMATY, R OWENS, A HURLEY, K PEHL, R MADDEN, N TI STATUS OF THE TRANSIENT GAMMA-RAY SPECTROMETER SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT 29th ESLAB Symposium on Towards the Source of Gamma-Ray Bursts CY APR 26-28, 1995 CL EUROPEAN SPACE RES & TECHNOL CTR, NOORDWIJK, NETHERLANDS SP ESLAB, ESTEC HO EUROPEAN SPACE RES & TECHNOL CTR DE GRBS; HIGH RESOLUTION SPECTROSCOPY; SOLID STATE DETECTORS AB The Transient Gamma-Ray Spectrometer (TGRS) was launched aboard the GGS/WIND spacecraft on November 1, 1994. After several deep space orbits (similar to 2 yrs) WIND will eventually be injected into a halo orbit around the Sun-Earth L(1) point. TGRS consists of a 215 cm(3) high purity n-type Ge crystal which is kept at cryogenic temperatures by a passive radiative cooler. The energy range covered by the instrument is similar to 25-8000 keV with an energy resolution of similar to 2-3 keV. The primary task of TGRS is to perform high resolution spectroscopy of gamma-ray bursts and solar flares. Additional objectives are the study of transient x-ray pulsars and, using an on-board passive occulter, the long-term monitoring of sources such as the Crab and the Galactic Center. Since launch, TGRS has been performing exceedingly well, and all the important experiment parameters such as background levels, gain, and resolution have proven to be very stable. To date, TGRS has detected 27 GRBs and three solar flares. Preliminary analysis of our data also indicates that TGRS is indeed sensitive to sources such as the Crab and the Galactic Center. C1 UNIV LEICESTER,LEICESTER LE1 7RH,LEICS,ENGLAND. UNIV CALIF BERKELEY,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP SEIFERT, H (reprint author), NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771, USA. RI Gehrels, Neil/D-2971-2012 NR 5 TC 2 Z9 2 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD SEP PY 1995 VL 231 IS 1-2 BP 475 EP 478 DI 10.1007/BF00658674 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TF267 UT WOS:A1995TF26700099 ER PT J AU GAVRILOV, VP KLEPIKOVA, NV RODEAN, HC AF GAVRILOV, VP KLEPIKOVA, NV RODEAN, HC TI TRIAL OF A NONLINEAR DIFFUSION EQUATION AS A MODEL OF TURBULENT-DIFFUSION SO ATMOSPHERIC ENVIRONMENT LA English DT Article DE ATMOSPHERIC DISPERSION; NONLINEAR PARAMETERIZATION; SIMILARITY SOLUTION; TURBULENT DIFFUSION; PRAIRIE GRASS EXPERIMENTS ID NON-LINEAR DIFFUSION AB A nonlinear diffusion equation is demonstrated as a model of turbulent dispersion in the atmosphere. It is based on a similarity solution for two-dimensional dispersion (longitudinal advection and vertical diffusion) from a horizontal line source. The coefficient for the vertical diffusion is a nonlinear function of both concentration and height. The similarity solution for two-dimensional dispersion includes a beta function with arguments that are functions of the parameters for the wind profile and the nonlinear vertical diffusion. The solution is successfully fitted to two sets of Prairie Grass data. C1 LAWRENCE LIVERMORE NATL LAB,DIV REG ATMOSPHER SCI,LIVERMORE,CA 94550. INST EXPTL METEOROL,OBNINSK 249020,RUSSIA. NR 14 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 1352-2310 J9 ATMOS ENVIRON JI Atmos. Environ. PD SEP PY 1995 VL 29 IS 17 BP 2317 EP 2322 DI 10.1016/1352-2310(95)00148-R PG 6 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA RT643 UT WOS:A1995RT64300010 ER PT J AU GAO, W AF GAO, W TI THE VERTICAL CHANGE OF COEFFICIENT-B, USED IN THE RELAXED EDDY ACCUMULATION METHOD FOR FLUX MEASUREMENT ABOVE AND WITHIN A FOREST CANOPY SO ATMOSPHERIC ENVIRONMENT LA English DT Article DE ATMOSPHERE-BIOSPHERE EXCHANGE; TRACE GAS FLUX; EDDY ACCUMULATION METHOD ID DECIDUOUS FOREST; REYNOLDS STRESS; SULFATE AB The relaxed eddy accumulation method (REAM), a conditional sampling technique, provides a potential alternative to the traditional eddy correlation method for measuring turbulent flux of chemical trace gases in the lower atmosphere, because it does not require a high sampling rate that is not feasible with most chemical analyzers. Recent studies suggest that the turbulent flux (($) over bar w'($) over bar c') is proportional to the standard deviation of vertical velocity (sigma(w)) and the difference (Delta c(w)) between mean concentrations conditionally sampled during updrafts and downdrafts. The relationship of ($) over bar w'($) over bar c' = b(c) sigma(w) Delta c(w) is used as the basis for the REAM. This relationship was tested with turbulence measurements made at six heights in and above a deciduous forest with emphasis on the height dependence of the coefficient b in the forest region. Results, based on the analysis of only sensible heat and water vapor fluxes with the REAM, show that the ($) over bar w'($) over bar c'-sigma(w) Delta c(w), linear relation may hold for different atmospheric stabilities and canopy leaf densities. The values of the coefficients b(T) and b(q) for both temperature and water vapor density, however, change with height, possibly because of the change in the efficiency of conditional concentration sampling during updrafts and downdrafts associated with the turbulence structure at different heights. At about 2.5 times the canopy height, b(T) is approximately equal to 0.58, which is close to the value of 0.6 found over a smooth surface. However, both b(T) and b(q) decrease as the canopy is approached and fall to about 0.51 at the canopy top. Using b(c) = 0.6 could cause the flux within the forest roughness sublayer to be overestimated as much as 18%. The possible role of organized turbulence structures of flow and the scalar fields existing in the lower atmosphere near the forest was examined. RP GAO, W (reprint author), ARGONNE NATL LAB,DIV ENVIRONM RES,ARGONNE,IL 60439, USA. NR 25 TC 24 Z9 24 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 1352-2310 J9 ATMOS ENVIRON JI Atmos. Environ. PD SEP PY 1995 VL 29 IS 17 BP 2339 EP 2347 DI 10.1016/1352-2310(95)00147-Q PG 9 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA RT643 UT WOS:A1995RT64300013 ER PT J AU SCHWARTZ, SE LEE, YN AF SCHWARTZ, SE LEE, YN TI LABORATORY STUDY OF NO2 REACTION WITH DISPERSED AND BULK LIQUID WATER SO ATMOSPHERIC ENVIRONMENT LA English DT Discussion ID NITROGEN-DIOXIDE RP SCHWARTZ, SE (reprint author), BROOKHAVEN NATL LAB,DIV ENVIRONM CHEM,UPTON,NY 11973, USA. RI Schwartz, Stephen/C-2729-2008 OI Schwartz, Stephen/0000-0001-6288-310X NR 9 TC 8 Z9 8 U1 1 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 1352-2310 J9 ATMOS ENVIRON JI Atmos. Environ. PD SEP PY 1995 VL 29 IS 18 BP 2557 EP 2559 DI 10.1016/1352-2310(95)92000-P PG 3 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA RU977 UT WOS:A1995RU97700017 ER PT J AU NOVAKOV, T AF NOVAKOV, T TI LABORATORY STUDY OF NO2 REACTION WITH DISPERSED AND BULK LIQUID WATER - REPLY SO ATMOSPHERIC ENVIRONMENT LA English DT Discussion ID NITROGEN-DIOXIDE RP NOVAKOV, T (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 3 TC 3 Z9 3 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 1352-2310 J9 ATMOS ENVIRON JI Atmos. Environ. PD SEP PY 1995 VL 29 IS 18 BP 2559 EP 2560 DI 10.1016/1352-2310(95)90226-0 PG 2 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA RU977 UT WOS:A1995RU97700018 ER PT J AU RADKE, LF ACKERMAN, AS HEGG, DA HOBBS, PV PENNER, JE AF RADKE, LF ACKERMAN, AS HEGG, DA HOBBS, PV PENNER, JE TI EFFECTS OF AGING ON THE SMOKE FROM A LARGE FOREST-FIRE SO ATMOSPHERIC RESEARCH LA English DT Article ID AEROSOL; ABSORPTION; EMISSIONS; PARTICLES AB A smoke plume from a large wildfire in Oregon was sampled over a period of three days as it traveled more than 1000 km above the Pacific Ocean. With increasing distance from the source, the dilution-normalized concentrations of particles in the nucleation mode (D < 0.2 mu m) in the plume decreased rapidly and the average sizes of the particles in the accumulation mode (D = 0.2-2.0 mu m) and coarse-particle mode (D = 2.0-5.4 mu m) increased, The dilution-normalized optical scattering coefficient due to the particles in the smoke also decreased with increasing distance from the fire. Changes in the size distribution of the particles in the plume with distance downwind (age) are compared with numerical modeling results of particle coagulation and plume dilution and are found to be in reasonable agreement. These rare held measurements of particle removal and modification rates in a dense, long-lived, plume are needed to help assess the role of biomass smokes as they relate to climate change. In the light of these measurements, it appears that the effects of particle coagulation in dense, persistent smokes may have been underestimated in some climate change calculations (e.g., nuclear winter) resulting in an overestimate of the smoke's impact. C1 UNIV WASHINGTON, DEPT ATMOSPHER SCI, AK-40, SEATTLE, WA 98195 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA USA. RI Ackerman, Andrew/D-4433-2012; Penner, Joyce/J-1719-2012 OI Ackerman, Andrew/0000-0003-0254-6253; NR 39 TC 31 Z9 31 U1 1 U2 6 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0169-8095 J9 ATMOS RES JI Atmos. Res. PD SEP PY 1995 VL 38 IS 1-4 BP 315 EP 332 DI 10.1016/0169-8095(95)00003-A PG 18 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA RX723 UT WOS:A1995RX72300018 ER PT J AU WILLARDSON, BM YOSHIDA, T BITENSKY, MW AF WILLARDSON, BM YOSHIDA, T BITENSKY, MW TI CYCLIC-NUCLEOTIDES AS REGULATORS OF LIGHT-ADAPTATION IN PHOTORECEPTORS SO BEHAVIORAL AND BRAIN SCIENCES LA English DT Article ID GTP HYDROLYSIS; TRANSDUCIN; PHOSDUCIN; PROTEIN AB Cyclic nucleotides can regulate the sensitivity of retinal rods to light through phosducin. The phosphorylation state of phosducin determines the amount of G(t) available for activation by Rho*. Phosducin phosphorylation is regulated by cyclic nucleotides through their activation of cAMP-dependent protein kinase. The regulation of phosphodiesterase activity by the noncatalytic cGMP binding sites as well as Ca2+/calmodulin dependent regulation of cGMP binding to the cation channel are also discussed. RP WILLARDSON, BM (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,BIOPHYS GRP,LOS ALAMOS,NM 87545, USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0140-525X J9 BEHAV BRAIN SCI JI Behav. Brain Sci. PD SEP PY 1995 VL 18 IS 3 BP 493 EP 494 PG 2 WC Psychology, Biological; Behavioral Sciences; Neurosciences SC Psychology; Behavioral Sciences; Neurosciences & Neurology GA TJ300 UT WOS:A1995TJ30000037 ER PT J AU Bandoni, SM Mulvey, M Loker, ES AF Bandoni, SM Mulvey, M Loker, ES TI Intraspecific and interspecific patterns of allozyme variation among species of Biomphalaria Preston, 1910 (Gastropoda: Planorbidae) SO BIOCHEMICAL SYSTEMATICS AND ECOLOGY LA English DT Article DE Biomphalaria; Planorbidae; Gastropoda; ramshorn snails; Schistosoma mansoni; allozymes; population variation; systematics ID GENETIC DIFFERENTIATION; SUBDIVIDED POPULATIONS; PFEIFFERI KRAUSS; SNAIL; GLABRATA; CAMEROON; SIMILARITIES; SYSTEMATICS; SPECIATION; DIVERSITY AB Freshwater snails in the genus Biomphalaria transmit Schistosoma mansoni, a causative agent of human schistosomiasis in Africa and the Neotropical region. Twenty-five populations representing 11 species of Biomphalaria from both Africa and the Neotropical region were examined using starch gel electrophoresis for 22 loci. The percentage of polymorphic loci observed per population varied from 4.5 to 63.6%, with a mean of 28.7%; observed heterozygosity levels varied from 0.002 to 0.126, with an average of 0.052. Observed heterozygosity and polymorphism values fell within the range of values reported in previous studies of the genus, but observed heterozygosity in most cases was less than expected under Hardy-Weinberg equilibrium. The genetic variance was partitioned among species, populations and individuals using hierarchical G-statistics. For all of the populations considered together, the variance among species was 58.4%, among populations within species 24.9%, and among individuals within a population 16.7%. When only the Neotropical species were considered, the percentages of the total variance attributable to variation among species, among populations within species, and among individuals were 18.1%, 29.2% and 52.7%, respectively. For the African species, 27.8% of the variance was among species, 42.3% among populations, and 29.9% among individuals. Intraspecific Roger's genetic distances ranged from 0.01 to 0.38, and interspecific distances from 0.1 to 0.84. Nei's unbiased distances ranged from 0.00 to 0.44 within a nominal species, and from 0.02 to 1.82 between species. Non-metric multidimensional scaling of Rogers' distances revealed a clear separation of African species from Neotropical species and of the Neotropical species from each other. The African species formed overlapping clusters. C1 SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. UNIV NEW MEXICO,DEPT BIOL,ALBUQUERQUE,NM 87131. NR 58 TC 8 Z9 8 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0305-1978 J9 BIOCHEM SYST ECOL JI Biochem. Syst. Ecol. PD SEP PY 1995 VL 23 IS 6 BP 593 EP 616 DI 10.1016/0305-1978(95)00049-6 PG 24 WC Biochemistry & Molecular Biology; Ecology; Evolutionary Biology SC Biochemistry & Molecular Biology; Environmental Sciences & Ecology; Evolutionary Biology GA TR371 UT WOS:A1995TR37100002 ER PT J AU HernandezMartich, JD Novak, JM Smith, MH Johns, PE AF HernandezMartich, JD Novak, JM Smith, MH Johns, PE TI Genetic structure of mosquitofish populations in the Altamaha and Ogeechee drainages of Georgia: Reporting an undescribed form in the Ocmulgee River SO BIOCHEMICAL SYSTEMATICS AND ECOLOGY LA English DT Article DE Gambusia holbrooki; mosquitofish; allozymes; genetic differentiation; heterozygosity; biogeography ID GAMBUSIA-HOLBROOKI; AFFINIS AB An electrophoretic survey of genetic variation in mosquitofish populations of the Altamaha and Ogeechee drainages in Georgia revealed significant divergence (F-ST=0.270) among populations within the Altamaha. Cluster analysis showed two lineages: one formed by populations from the Ogeechee drainage and the eastern and central Altamaha branches and another consisting of populations from the Ocmulgee River, the westernmost branch of the Altamaha drainage. These lineages may represent two independent forms. Average modified Rogers' genetic distance was 0.256 between the two groups. The Ocmulgee lineage had significantly higher multilocus heterozygosity ((H) over bar=0.206) than the other one ((H) over bar=0.120). The high heterozygosity in the Ocmulgee lineage is consistent with the hypothesis that it originated by hybridization. Populations in the Altamaha and Ogeechee exhibit spatial patterns of genetic characteristics similar to those previously described for populations in other drainages. C1 UNIV GEORGIA,INST ECOL,ATHENS,GA 30602. RP HernandezMartich, JD (reprint author), SAVANNAH RIVER ECOL LAB,DRAWER E,AIKEN,SC 29802, USA. NR 22 TC 5 Z9 5 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0305-1978 J9 BIOCHEM SYST ECOL JI Biochem. Syst. Ecol. PD SEP PY 1995 VL 23 IS 6 BP 617 EP 625 DI 10.1016/0305-1978(95)00060-7 PG 9 WC Biochemistry & Molecular Biology; Ecology; Evolutionary Biology SC Biochemistry & Molecular Biology; Environmental Sciences & Ecology; Evolutionary Biology GA TR371 UT WOS:A1995TR37100003 ER PT J AU STONE, DB SCHNEIDER, DK HUANG, ZW MENDELSON, RA AF STONE, DB SCHNEIDER, DK HUANG, ZW MENDELSON, RA TI THE RADIUS OF GYRATION OF NATIVE AND REDUCTIVELY METHYLATED MYOSIN SUBFRAGMENT-1 FROM NEUTRON-SCATTERING SO BIOPHYSICAL JOURNAL LA English DT Article ID VANADATE; ACTIN; HEAD; NUCLEOTIDES; ALKYLATION; BINDING; ATPASE; MUSCLE; THIOL AB Reductive methylation of nearly all lysine groups of myosin subfragment-1 (S1) was required for crystallization and solution of its structure at atomic resolution. Possible effects of such methylation on the radius of gyration of chicken skeletal muscle myosin S1 have been investigated by using smalt-angle neutron scattering. In addition, we have investigated the effect of MgADP . V-i, which is thought to produce an analog of the S1 . ADP . P-i state, on the S1 radius of gyration. We find that although methylation of S1, with or without SO42- ion addition, does not significantly alter the structure, addition of ADP plus vanadate does decrease the radius of gyration significantly. The S1 crystal structure predicts a radius of gyration close to that measured here by neutron scattering. These results suggest that the overall shape found by crystallography resembles nucleotide-free S1 in solution. In order to estimate the effect of residues missing from the crystal structure, the structure of missing loops was estimated by secondary-structure prediction methods. Calculations using the complete crystal structure show that a simple closure of the nucleotide cleft by a rigid-body torsional rotation of residues (172-180 to 670) around an axis running along the base of the cleft alone does not produce changes as large as seen here and in x-ray scattering results. On the other hand, a rigid body rotation of either the light-chain binding domain (767 to 843 plus light chains) or of a portion of 20-kDa peptide plus this domain (706 to 843 plus light chains) is more readily capable of producing such changes. C1 UNIV CALIF SAN FRANCISCO,INST CARDIOVASC RES,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,DEPT BIOCHEM & BIOPHYS,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,DEPT PHARMACEUT CHEM,SAN FRANCISCO,CA 94143. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. FU NCRR NIH HHS [RR01081]; NIAMS NIH HHS [P01-AR 42895, R01-AR 39710] NR 40 TC 7 Z9 7 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD SEP PY 1995 VL 69 IS 3 BP 767 EP 776 PG 10 WC Biophysics SC Biophysics GA RZ852 UT WOS:A1995RZ85200004 PM 8519977 ER PT J AU SAVIKHIN, S VANNOORT, PI BLANKENSHIP, RE STRUVE, WS AF SAVIKHIN, S VANNOORT, PI BLANKENSHIP, RE STRUVE, WS TI FEMTOSECOND PROBE OF STRUCTURAL ANALOGIES BETWEEN CHLOROSOMES AND BACTERIOCHLOROPHYLL-C AGGREGATES SO BIOPHYSICAL JOURNAL LA English DT Article ID BACTERIUM CHLOROFLEXUS-AURANTIACUS; GREEN PHOTOSYNTHETIC BACTERIA; PROSTHECOCHLORIS-AESTUARII; ANTENNA ORGANIZATION; PIGMENT ORGANIZATION; RESONANCE RAMAN; ENERGY-TRANSFER; PROTEIN; VISUALIZATION; RESOLUTION AB Bacteriochlorophyll c pigments extracted from light-harvesting chlorosomes in green photosynthetic bacteria are known to self-assemble into aggregates whose electronic spectroscopy resembles that of intact chlorosomes. Femtosecond optical experiments reveal that the chlorosomes and their reconstituted aggregates exhibit closely analogous internal energy transfer kinetics and exciton state evolution. These comparisons furnish compelling new evidence that proteins do not exert a major local role in the BChl c antenna pigment organization of intact chlorosomes. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. ARIZONA STATE UNIV,DEPT CHEM,TEMPE,AZ 85287. ARIZONA STATE UNIV,CTR STUDY EARLY EVENTS PHOTOSYNTHESIS,TEMPE,AZ 85287. NR 36 TC 16 Z9 16 U1 0 U2 2 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD SEP PY 1995 VL 69 IS 3 BP 1100 EP 1104 PG 5 WC Biophysics SC Biophysics GA RZ852 UT WOS:A1995RZ85200035 PM 8519963 ER PT J AU WEIER, HUG GREULICH, KM YOUNG, DM AF WEIER, HUG GREULICH, KM YOUNG, DM TI DUAL TEMPERATURE IN-SITU HYBRIDIZATION SO BIOTECHNIQUES LA English DT Note ID INSITU HYBRIDIZATION; DNA C1 VET ADM HOSP MED CTR,SAN FRANCISCO,CA. RP WEIER, HUG (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,CTR MOLEC CYTOGENET,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 7 TC 3 Z9 3 U1 0 U2 1 PU EATON PUBLISHING CO PI NATICK PA 154 E. CENTRAL ST, NATICK, MA 01760 SN 0736-6205 J9 BIOTECHNIQUES JI Biotechniques PD SEP PY 1995 VL 19 IS 3 BP 364 EP 366 PG 3 WC Biochemical Research Methods; Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA RU448 UT WOS:A1995RU44800012 PM 7495546 ER PT J AU ANDREWS, GF NOAH, KS AF ANDREWS, GF NOAH, KS TI DESIGN OF GAS-TREATMENT BIOREACTORS SO BIOTECHNOLOGY PROGRESS LA English DT Article ID NITROGEN-OXIDES; SULFUR-DIOXIDE; REMOVAL; CONVERSION; BACTERIA; PHASE; SOIL AB Bioreactors are employed increasingly to remove undesirable components from gas streams and to carry out bioprocesses with gaseous nutrients. The problem is to match the type and detailed design of the bioreactor to the characteristics of the component and the microbial metabolism, in order to meet a given set of process requirements at the lowest possible total cost. The higher the specified fractional removal, the greater the advantage of packed-bed and bubble-column reactors in which the gas approaches plug flow. The variation of the gas/liquid interfacial area with gas flow rate makes bubble columns unsuitable for relatively dilute, insoluble components (e.g., hydrocarbons), but the complete mixing of the Liquid is an advantage with more concentrated, soluble components, particularly those (e.g., H2S, SO2) that dissociate in contact with water and may be inhibitory at their equilibrium concentrations. When the component is the carbon/energy source or electron acceptor for metabolism, the amount of viable biomass in the reactor at steady state is limited to the rate of component removal divided by the maintenance requirement of the biomass for the component. However, the volume of water in which this biomass is suspended is a variable to be fixed by the process designer or operator. Thus, a packed-bed bioreactor may be run as a minimum-water biofilm reactor (given a film-forming organism) or as a trickle-bed reactor containing a dilute cell culture (better when the metabolism requires a soluble nutrient or produces a nonvolatile and inhibitory product). In either case, the optimum operating point, close to the onset of mass-transfer Limitation, can be identified by setting the appropriate definition of the Thiele modulus equal to 1. An analysis based on interpolation between these limiting cases suggests a general definition of the modulus. It can be used in conjunction with mass-transfer and liquid-holdup correlations as a guide for selecting the type and size of packing material, operating strategies, and scale-up procedures, which can then be tested by experiment on particular gas streams. RP ANDREWS, GF (reprint author), IDAHO NATL ENGN LAB,DEPT BIOTECHNOL,POB 1625,IDAHO FALLS,ID 83415, USA. NR 23 TC 12 Z9 12 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 8756-7938 J9 BIOTECHNOL PROGR JI Biotechnol. Prog. PD SEP-OCT PY 1995 VL 11 IS 5 BP 498 EP 509 DI 10.1021/bp00035a002 PG 12 WC Biotechnology & Applied Microbiology; Food Science & Technology SC Biotechnology & Applied Microbiology; Food Science & Technology GA RY989 UT WOS:A1995RY98900002 ER PT J AU FITZNER, RE GRAY, RH HINDS, WT AF FITZNER, RE GRAY, RH HINDS, WT TI HEAVY-METAL CONCENTRATIONS IN GREAT BLUE HERON FECAL CASTINGS IN WASHINGTON-STATE - A TECHNIQUE FOR MONITORING REGIONAL AND GLOBAL TRENDS IN ENVIRONMENTAL CONTAMINANTS SO BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY LA English DT Article ID FEATHERS; CADMIUM; LEAD; BIOACCUMULATION; SELENIUM; MERCURY AB Growing concern over the health of the world's environment necessitates development of methods to monitor environmental changes over time. Various proposals involving ''literally'' thousands of useful ecological indicators (Cairns and McCormick 1992) have been published over the past two or three decades. Hinds (1984) and Cairns and McCormick (1992) discuss several aspects of such proposals, including the theoretical foundations for the use of indicators in ecosystem-based monitoring. Sampling of animals often requires a choice between killing individuals in the field to allow measurement, or using an indirect or correlation-based non-destructive sampling technique. The latter is preferred usually for long-term monitoring programs. Sampling of feathers to determine metal concentrations in tropical Pacific Rim birds, including herons, was reported by Burger (1993), Burger and Gochfeld (1991, 1993), and Burger et al. (1992, 1993). While collection of feathers did not harm the birds, the feathers still had to be plucked from the birds. We report a method that does not involve disturbing the birds. Great blue herons (Ardea herodius) feed at the top of a diverse but reasonably well understood food web. The birds are colonial during their reproductive season, and gather into identifiable, replicable, and annually repeated groups, using the same nests (usually in trees) for years at a time. Herons maintain nests free of regurgitated prey parts and nestling fecal materials by discarding detritus and fecal sacs over the nest edge. This behavior produces a ''rain'' of fecal matter including identifiable discarded or undigested items (e.g., bones) that reflect the food on which herons prey. Collecting this material provides a quantifiable estimate of contaminants in the food web (Fitzner et al. 1982) and makes the heron a prime sampling target (Fitzner et al. 1982; Carlile and Fitzner 1983; Hinds 1983). We discuss here the results of a two-year study designed to determine the relationship between heavy metal residues in heron fecal castings and those in heron tissues from the same colonies. We also evaluated whether analysis of heron excrement was a reliable indication of heavy metals in the environment. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. US DOE, WASHINGTON, DC 20585 USA. NR 13 TC 18 Z9 19 U1 0 U2 7 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0007-4861 EI 1432-0800 J9 B ENVIRON CONTAM TOX JI Bull. Environ. Contam. Toxicol. PD SEP PY 1995 VL 55 IS 3 BP 398 EP 403 PG 6 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA RH075 UT WOS:A1995RH07500011 PM 8520146 ER PT J AU DEVOLPI, A AF DEVOLPI, A TI FAST FINISH TO PLUTONIUM PERIL SO BULLETIN OF THE ATOMIC SCIENTISTS LA English DT Article RP DEVOLPI, A (reprint author), ARGONNE NATL LAB,ARM CONTROL & NONPROLIFERAT PROGRAM,ARGONNE,IL 60439, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU EDUC FOUNDATION NUCLEAR SCI PI CHICAGO PA 6042 SOUTH KIMBARK, CHICAGO, IL 60637 SN 0096-3402 J9 B ATOM SCI JI Bull. Atom. Scient. PD SEP-OCT PY 1995 VL 51 IS 5 BP 20 EP 21 PG 2 WC International Relations; Social Issues SC International Relations; Social Issues GA RP597 UT WOS:A1995RP59700013 ER PT J AU TSCHAPLINSKI, TJ GEBRE, GM DAHL, JE ROBERTS, GT TUSKAN, GA AF TSCHAPLINSKI, TJ GEBRE, GM DAHL, JE ROBERTS, GT TUSKAN, GA TI GROWTH AND SOLUTE ADJUSTMENT OF CALLI OF POPULUS CLONES CULTURED ON NUTRIENT MEDIUM CONTAINING POLYETHYLENE-GLYCOL SO CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE LA English DT Article ID INDUCED WATER-STRESS; PLANT-CELLS; TOLERANCE; ACCUMULATION; RESISTANCE; SALT AB To determine whether in vitro assays can be used as a surrogate for whole plants in the assessment of drought tolerance, six clones in a pedigree consisting of black cottonwood (Populus trichocarpa Torr. & Gray, female) and eastern cottonwood (Populus deltoides Bartr., male) and four hybrid progeny were regenerated in tissue culture and subjected to 0-20% polyethylene glycol (PEG) mel. wt. 8000 in the nutrient medium, providing osmotic potentials that ranged from -0.40 to -1.29 MPa. Drought tolerance was assessed by callus growth and solute accumulation under various stress conditions. Among the cultures grown in the light (16-h photoperiod), clones with the highest relative growth rate of callus dry weight after 18 d in the nutrient medium without PEG included hybrids 246 female,242 male, and the eastern cottonwood male parent; the same clones that tended to be the most drought tolerant in previous whole-plant studies. However, there were few clonal differences in relative growth rate across PEG concentrations or among light or dark environments, and any differences were not related to solute accumulation. Polyethylene glycol (20%) provided a severe osmotic stress that dehydrated callus cultures, thereby suppressing relative growth rate on a fresh-weight basis, but not on a dry-weight basis. Inorganic cations and free amino acids constituted the bulk of the solutes in calli, whereas concentrations of soluble carbohydrates were low. Therefore, results obtained from callus cultures growing under artificially induced drought regimes did not parallel those obtained from water stress studies on whole plants. RP TSCHAPLINSKI, TJ (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. RI Tuskan, Gerald/A-6225-2011; OI Tuskan, Gerald/0000-0003-0106-1289; Tschaplinski, Timothy/0000-0002-9540-6622 NR 19 TC 12 Z9 13 U1 0 U2 1 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0045-5067 J9 CAN J FOREST RES JI Can. J. For. Res.-Rev. Can. Rech. For. PD SEP PY 1995 VL 25 IS 9 BP 1425 EP 1433 DI 10.1139/x95-155 PG 9 WC Forestry SC Forestry GA RZ628 UT WOS:A1995RZ62800003 ER PT J AU PHILPOTT, MR GLOSLI, JN AF PHILPOTT, MR GLOSLI, JN TI MOLECULAR-DYNAMICS SIMULATION OF THE ADSORPTION OF BENZENE ON CHARGED METAL-ELECTRODES IN THE PRESENCE OF AQUEOUS-ELECTROLYTE SO CHEMICAL PHYSICS LA English DT Article ID WATER PLATINUM INTERFACE; LIQUID WATER; PARTICLE SIMULATIONS; COMPUTER-SIMULATION; SURFACE; IONS; ALGORITHM AB Classical molecular dynamics was used to model the adsorption of benzene on metal electrodes in a thin electrochemical cell containing aqueous NaCl solution. On uncharged electrodes benzene was adsorbed mostly flat and the ions formed a neutral diffuse region between the electrodes. As the charge on the electrode was increased the diffuse layer rearranged to shield the center of the film from the electric field. The remaining high electric field at the surface caused ordering of water molecules next to the metal, and this in turn promoted benzene desorption. Desorption occurred first from the cathode because of a higher surface electric field between the hydrated sodium ion in solution and the negative electrode. At the anode the field across the water layer was lower because the chloride ion was adsorbed in contact closer to metal than the water layer. At the highest electrode charge density both ions were adsorbed in contact On their respective electrodes and benzene was desorbed from both surfaces into the central aqueous region. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP PHILPOTT, MR (reprint author), IBM CORP,DIV RES,ALMADEN RES CTR,650 HARRY RD,SAN JOSE,CA 95120, USA. NR 38 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 J9 CHEM PHYS JI Chem. Phys. PD SEP 1 PY 1995 VL 198 IS 1-2 BP 53 EP 61 DI 10.1016/0301-0104(95)00098-9 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RT464 UT WOS:A1995RT46400006 ER PT J AU CHENNA, A SINGER, B AF CHENNA, A SINGER, B TI LARGE-SCALE SYNTHESIS OF P-BENZOQUINONE-2'-DEOXYCYTIDINE AND P-BENZOQUINONE-2'-DEOXYADENOSINE ADDUCTS AND THEIR SITE-SPECIFIC INCORPORATION INTO DNA OLIGONUCLEOTIDES SO CHEMICAL RESEARCH IN TOXICOLOGY LA English DT Article ID NUCLEIC-ACID; OXADIAZABICYCLONONENE RESIDUES; GUANINE NUCLEOSIDES; ACROLEIN; MALONALDEHYDE; MALONDIALDEHYDE; CROTONALDEHYDE; BENZOQUINONE; CELLS; 2-BROMOACROLEIN AB Benzene is a carcinogen in rodents and a cause of bone marrow toxicity and leukemia in humans. p-Benzoquinone (p-BQ) is one of the stable metabolites of benzene, as well as of a number of drugs and other chemicals. 2'-Deoxycytidine (dC) and 2'-deoxyadenosine (dA) were allowed to react with p-BQ in aqueous solution at pH 7.4 and 4.5. The yields were considerably higher at pH 4.5 than at pH 7.4, as indicated by HPLC analysis. The desired products were isolated by column chromatography on silica gel or cellulose. Identification was done by FAB-MS, H-1 NMR, and UV spectroscopy. The reaction of p-BQ with dC and dA at pH 4.5 produced the exocyclic compounds 3-hydroxy-1,N-4-benzetheno-2'-deoxycytidine (p-BQ-dC), and 9-hydroxyl, N-6-benzetheno-2'-deoxyadenosine (p-BQ-dA), respectively, in a large scale and high yield. These adducts have been previously made in a microgram scale as the 3'-phosphate for P-32-postlabeling studies of their incidence in DNA. The p-BQ-dC and p-BQ-dA adducts have, in addition to the two hydroxyl groups of deoxyribose, one newly formed hydroxyl group at the C-3 or C-9 of the exocyclic base of each product respectively. Incorporation of these adducts into oligonucleotides as the phosphoramidite requires the protection of all three hydroxyl groups in these compounds. The exocyclic hydroxyl on the base has been successfully protected by acylation after protecting the 5'- and the 3'-hydroxyl groups of the sugar moiety with a 4,4'-dimethoxytrityl group and a cyanoethyl N,N-diisopropylphosphoramidite group, respectively. For the first time, to our knowledge, the fully protected phosphoramidites of p-BQ-dC and p-BQ-dA were prepared and incorporated site-specifically into a series of oligonucleotides. The coupling efficiency was very high (>98%). However, deprotection of the DNA oligomers with ammonia produced only 50% of the desired oligomers containing the adduct. In contrast, when 10% of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) in methanol at room temperature was used, only the desired oligomers were detected by HPLC. Thus, by deprotecting the oligomers with methoxide ions (DBU/methanol) and avoiding the use of ammonia, a high yield of modified DNA was obtained. After purification of these oligomers by HPLC, they were hydrolyzed enzymatically and analyzed by HPLC, which confirmed the base composition and the incorporation of the adducts. The mass spectroscopic analysis of the DNA oligomers was confirmed by electrospray MS. These oligomers are now under investigation for their biochemical properties. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,CANC BIOL GRP,BERKELEY,CA 94720. FU NCI NIH HHS [CA47723] NR 41 TC 29 Z9 29 U1 1 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0893-228X J9 CHEM RES TOXICOL JI Chem. Res. Toxicol. PD SEP PY 1995 VL 8 IS 6 BP 865 EP 874 DI 10.1021/tx00048a007 PG 10 WC Chemistry, Medicinal; Chemistry, Multidisciplinary; Toxicology SC Pharmacology & Pharmacy; Chemistry; Toxicology GA RU205 UT WOS:A1995RU20500007 PM 7492736 ER PT J AU PETERSON, JR XU, W DAI, S AF PETERSON, JR XU, W DAI, S TI OPTICAL-PROPERTIES OF DIVALENT THULIUM IN CRYSTALLINE STRONTIUM TETRABORATE SO CHEMISTRY OF MATERIALS LA English DT Article ID LUMINESCENCE PROPERTIES; UPCONVERSION; GLASS; IONS AB Absorption and luminescence spectra from SrB4O7:Tm2+ prepared in air have been recorded at room temperature. Because thulium was introduced as Tm3+ from Tm2O3, a valence change from Tm3+ to Tm2+ was observed. Optimum production of Tm2+ ion occurs when the sample is heated in air at 650 degrees C. A broad emission band centered in the vicinity of 550 nm has been observed from the sample upon excitation at 457.9 nm. We suggest that it is due to Tm2+ ion emission from the 5d band into the ground-state 4f level (F-2(7/2)). Several conditions promoting the reduction of Tm3+ ion in the sample are discussed. In addition, to aid the reduction of Tm3+ ion, we have also prepared SrB4O7:Tm2+ in Ar/H-2 (4%) atmosphere and compared the optical characteristics of Tm2+ ion in these samples with those prepared in air. C1 OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,TRANSURANIUM RES LAB,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831. RP PETERSON, JR (reprint author), UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996, USA. RI Dai, Sheng/K-8411-2015 OI Dai, Sheng/0000-0002-8046-3931 NR 20 TC 35 Z9 38 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD SEP PY 1995 VL 7 IS 9 BP 1686 EP 1689 DI 10.1021/cm00057a017 PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA RW212 UT WOS:A1995RW21200017 ER PT J AU SUN, YF BROWN, GM MOYER, BA AF SUN, YF BROWN, GM MOYER, BA TI TIO2 MEDIATED PHOTOOXIDATION OF TRICHLOROETHYLENE AND TOLUENE, DISSOLVED IN FLUOROCARBON SOLVENTS SO CHEMOSPHERE LA English DT Article ID WATER; PHOTODEGRADATION AB Titanium dioxide mediated photodegradation of trichloroethylene (TCE) and toluene dissolved in a fluorocarbon solvent (Galden(R) HT110) was demonstrated. The photodegradation of TCE yielded dichloroacetic acid as a major intermediate. The TCE reaction kinetics and high photoefficiency suggest autocatalysis and/or a radical chain reaction mechanism. Photooxidation of toluene is a first-order reaction. Membrane-assisted solvent extraction of TCE from water to the fluorocarbon solvent was demonstrated, and the combination of photooxidation and extraction form the basis for a novel two-stage process for the removal and destruction of organic contaminants from water. RP SUN, YF (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,POB 2008,OAK RIDGE,TN 37831, USA. RI Solominow, Sonia/A-4021-2008; Moyer, Bruce/L-2744-2016 OI Moyer, Bruce/0000-0001-7484-6277 NR 15 TC 5 Z9 5 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0045-6535 J9 CHEMOSPHERE JI Chemosphere PD SEP PY 1995 VL 31 IS 6 BP 3575 EP 3584 DI 10.1016/0045-6535(95)00191-A PG 10 WC Environmental Sciences SC Environmental Sciences & Ecology GA RX182 UT WOS:A1995RX18200020 ER PT J AU DUNNING, TH STULTS, BR AF DUNNING, TH STULTS, BR TI MOLECULAR SCIENCE SOLVING GLOBAL PROBLEMS SO CHEMTECH LA English DT Article C1 PNL,DIV ENVIRONM & ENERGY SCI,RICHLAND,WA 99352. RP DUNNING, TH (reprint author), PNL,EMSL,POB 999,RICHLAND,WA 99352, USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0009-2703 J9 CHEMTECH JI Chemtech PD SEP PY 1995 VL 25 IS 9 BP 10 EP 15 PG 6 WC Chemistry, Applied SC Chemistry GA RV070 UT WOS:A1995RV07000004 ER PT J AU MEYNE, J GOODWIN, EH AF MEYNE, J GOODWIN, EH TI DIRECTION OF DNA-SEQUENCES WITHIN CHROMATIDS DETERMINED USING STRAND-SPECIFIC FISH SO CHROMOSOME RESEARCH LA English DT Article DE CENTROMERE; MAPPING; FLUORESCENCE IN SITU HYBRIDIZATION; REPETITIVE DNA; TELOMERE ID ALPHOID DNA; TELOMERES AB The 5' to 3' direction of DNA strands within chromatids of metaphase chromosomes can be determined by using simultaneous hybridization of a single strand of the telomere probe and a single strand of a repetitive sequence to slides pretreated for strand-specific hybridization. The telomere probe identifies the direction of the DNA helical strand remaining in each chromatid of the metaphase chromosomes. The direction of the repetitive sequence is then determined from the direction of the strand to which it hybridizes. This method was used to determine the 5' to 3' direction of three repetitive DNA sequences, each for a different human repeat family. C1 LOS ALAMOS NATL LAB,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM 87545. RP MEYNE, J (reprint author), LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545, USA. NR 10 TC 14 Z9 14 U1 0 U2 0 PU RAPID SCIENCE PUBLISHERS PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8NH SN 0967-3849 J9 CHROMOSOME RES JI Chromosome Res. PD SEP PY 1995 VL 3 IS 6 BP 375 EP 378 DI 10.1007/BF00710019 PG 4 WC Biochemistry & Molecular Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Genetics & Heredity GA RK756 UT WOS:A1995RK75600006 PM 7551553 ER PT J AU COVEY, C AF COVEY, C TI GLOBAL OCEAN CIRCULATION AND EQUATOR-POLE HEAT-TRANSPORT AS A FUNCTION OF OCEAN GCM RESOLUTION SO CLIMATE DYNAMICS LA English DT Article ID WORLD OCEAN; GENERAL-CIRCULATION; MESOSCALE EDDIES; MODEL; ATMOSPHERE; SIMULATIONS; BUDGETS; PACIFIC; ENERGY; MASS AB To determine whether resolution of smaller scales is necessary to simulate large-scale ocean climate correctly, I examine results from a global ocean GCM run with different horizontal grid spacings. The horizontal grid spacings span a range from coarse resolutions traditionally used in climate modeling to nearly the highest resolution attained with today's computers. The experiments include four cases employing 4 degrees, 2 degrees, 1 degrees and 1/2 degrees spacing in latitude and longitude, which were run with minimal differences among them, i.e., in a controlled experiment. Two additional cases, 1/2 degrees spacing with a more scale-selective sub-gridscale mixing of heat and momentum, and approximate 1/4 degrees spacing, are also included. The 1/4 degrees run resolves most of the observed mesoscale eddy energy in the ocean. Artificial constraints on the model tend to minimize differences among the different resolution cases. Nevertheless, the simulations show significant changes as resolution increases. These changes generally but not always bring the model into better agreement with observations. Differences are typically more noticeable when comparing the 4 degrees and 2 degrees runs than when comparing the 2 degrees and 1 degrees runs or the 1 degrees and 1/2 degrees runs. A reasonable conclusion to draw for current studies with coupled ocean-atmosphere GCMs is that the ocean grid spacing could be set to about 1 degrees to accrue the benefits of enhanced resolution without paying an excessively steep price in computer-time cost. The model's poleward heat transport at 1/2 degrees grid spacing peaks at about 1x10(15) W in the Northern Hemisphere and 0.5x10(15) W in the Southern Hemisphere. These values are significantly below observations, a problem typical of ocean GCMs even when they are less constrained than in the present study. This present problem is alleviated somewhat in the 1/4 degrees run. In this case, however, the eddies resolved by the model generally act to counter rather than to reinforce the heat transport of the mean flow. Improved heat transport may result less from enhanced resolution than from other changes made in this version of the model, such as more accurate wind forcing. RP COVEY, C (reprint author), LAWRENCE LIVERMORE NATL LAB,PROGRAM CLIMATE DIAGNOSIS & INTERCOMPARISON,LIVERMORE,CA 94550, USA. NR 44 TC 9 Z9 9 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0930-7575 J9 CLIM DYNAM JI Clim. Dyn. PD SEP PY 1995 VL 11 IS 7 BP 425 EP 437 DI 10.1007/BF00209516 PG 13 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA RY501 UT WOS:A1995RY50100004 ER PT J AU SUMPTER, BG NOID, DW AF SUMPTER, BG NOID, DW TI COMPUTATIONAL APPROACHES TO AUTOMATIC DATA CLUSTERING AND CLASSIFICATION SO COMPUTATIONAL POLYMER SCIENCE LA English DT Article DE NEURAL NETWORKS; POLYETHYLENE; GLASS-TRANSITION TEMPERATURE ID NEURAL NETWORK AB A general purpose computational scheme for automatic data clustering and classification is developed based on the utilization of neural-network techniques (Fuzzy ART and ARTMAP). The neural network approach is used to classify melting and glass-transition temperatures for polymeric materials based on their molecular structure (acting as a technique to sort out similarity), to automatically cluster configurations generated by molecular-dynamics simulations of polyethylene chains, to determine structural instabilities in carbon nanotubes, and to classify fragments generated from thermal degradation of graphite surfaces. Comparisons are made to a number of different clustering techniques, in particular, the partitioning and hierarchical (agglomerative and divisive) methods originated in statistics. The overall results demonstrate how the neural-network approach to data clustering and classification offers a number of advantages needed to perform these tasks on a routine basis. C1 OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. RI Sumpter, Bobby/C-9459-2013 OI Sumpter, Bobby/0000-0001-6341-0355 NR 33 TC 3 Z9 4 U1 1 U2 1 PU PRA PRESS PI CINCINNATI PA POLYMER RES ASSOC INC 9200 MONTGOMERY RD, SUITE 23B, CINCINNATI, OH 45242 SN 1052-0643 J9 COMPUT POLYMER SCI JI Comput. Polym. Sci. PD SEP PY 1995 VL 5 IS 3 BP 121 EP 134 PG 14 WC Polymer Science SC Polymer Science GA TC793 UT WOS:A1995TC79300005 ER PT J AU KUNIN, MM AF KUNIN, MM TI EDUCATION REFORM - STAKING OUT COMMON GROUND SO DAEDALUS LA English DT Article RP KUNIN, MM (reprint author), US DOE,WASHINGTON,DC 20585, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU DAEDALUS PI CAMBRIDGE PA 136 IRVING ST, STE 100, CAMBRIDGE, MA 02138 SN 0011-5266 J9 DAEDALUS JI Daedalus PD FAL PY 1995 VL 124 IS 4 BP 93 EP 100 PG 8 WC Humanities, Multidisciplinary; Social Sciences, Interdisciplinary SC Arts & Humanities - Other Topics; Social Sciences - Other Topics GA RT141 UT WOS:A1995RT14100011 ER PT J AU ROBINSON, SP AF ROBINSON, SP TI LIFE, LITERACY, AND THE PURSUIT OF CHALLENGES SO DAEDALUS LA English DT Article RP ROBINSON, SP (reprint author), US DOE,OFF EDUC RES & IMPROVEMENT,WASHINGTON,DC 20585, USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU DAEDALUS PI CAMBRIDGE PA 136 IRVING ST, STE 100, CAMBRIDGE, MA 02138 SN 0011-5266 J9 DAEDALUS JI Daedalus PD FAL PY 1995 VL 124 IS 4 BP 135 EP 142 PG 8 WC Humanities, Multidisciplinary; Social Sciences, Interdisciplinary SC Arts & Humanities - Other Topics; Social Sciences - Other Topics GA RT141 UT WOS:A1995RT14100017 ER PT J AU CHANG, YW AF CHANG, YW TI DYNAMIC SOIL PRESSURES ON RIGID VERTICAL WALLS - DISCUSSION SO EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS LA English DT Note RP CHANG, YW (reprint author), ARGONNE NATL LAB,DIV REACTOR ENGN,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0098-8847 J9 EARTHQUAKE ENG STRUC JI Earthq. Eng. Struct. Dyn. PD SEP PY 1995 VL 24 IS 9 BP 1283 EP 1284 DI 10.1002/eqe.4290240908 PG 2 WC Engineering, Civil; Engineering, Geological SC Engineering GA RT682 UT WOS:A1995RT68200007 ER PT J AU TANG, Y AF TANG, Y TI DYNAMIC SOIL PRESSURES ON RIGID CYLINDRICAL VAULTS - DISCUSSION SO EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS LA English DT Note RP TANG, Y (reprint author), ARGONNE NATL LAB,DIV REACTOR ENGN,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0098-8847 J9 EARTHQUAKE ENG STRUC JI Earthq. Eng. Struct. Dyn. PD SEP PY 1995 VL 24 IS 9 BP 1295 EP 1295 DI 10.1002/eqe.4290240912 PG 1 WC Engineering, Civil; Engineering, Geological SC Engineering GA RT682 UT WOS:A1995RT68200011 ER PT J AU NOVICK, GE NOVICK, CC YUNIS, J YUNIS, E MARTINEZ, K DUNCAN, GG TROUP, GM DEININGER, PL STONEKING, M BATZER, MA HERRERA, RJ AF NOVICK, GE NOVICK, CC YUNIS, J YUNIS, E MARTINEZ, K DUNCAN, GG TROUP, GM DEININGER, PL STONEKING, M BATZER, MA HERRERA, RJ TI POLYMORPHIC HUMAN SPECIFIC ALU INSERTIONS AS MARKERS FOR HUMAN IDENTIFICATION SO ELECTROPHORESIS LA English DT Article; Proceedings Paper CT 3rd International Conference on DNA Fingerprinting CY DEC 13-16, 1994 CL HYDERABAD, INDIA DE ALU REPEATS; POPULATION GENETICS; PATERNITY TESTING ID DNA-SEQUENCES; HUMAN GENOME; REPETITIVE ELEMENTS; FAMILY; EVOLUTION; AMPLIFICATION; REPEATS; GENES AB Alu sequences represent the largest family of short interspersed repetitive elements (SINEs) in humans with 500 000 copies per genome. Recently, one Alu subfamily was found to be human specific (HS). We originally described the use of polymorphic PIS Alu insertions as a tool in population studies and recently as tools in DNA fingerprinting and forensic analysis. In this report, we will use this simple polymerase chain reaction (PCR) base technique for the detection of HS Alu insertion polymorphisms. We will test the resolving power of this DNA profiling approach in both population genetics and paternity assessment. At the population level, we will describe the genotypic distribution of five polymorphic Alu insertions among 3 populations from the American continent, one of African origin, the other two Amerindians. Insight into their relationships will be provided. At the family level, we will examine one European American family of seven individuals and the same pedigree will also be characterized by way of the two systems currently and widely used to ascertain paternity: PCR-sequence specific oligonucleotide probe hybridization (PCR-SSO) and PCR-restriction fragment length polymorphism (PCR-RFLP) of human leucocyte antigen (HLA) class II molecules, and a standard RFLP protocol used in forensic casework and paternity studies. The importance and strengths of the method as well as its perspectives for future use in filiation studies will be evaluated. C1 FLORIDA INT UNIV,DEPT BIOL SCI,MIAMI,FL 33199. HARVARD UNIV,SCH MED,DANA FARBER CANC INST,DEPT PATHOL,CAMBRIDGE,MA 02138. UNIV NACL COLOMBIA,INST GENET,BOGOTA,COLOMBIA. UNIV NEW MEXICO,SCH MED,DEPT PATHOL,ALBUQUERQUE,NM 87131. LOUISIANA STATE UNIV,MED CTR,DEPT BIOCHEM & MOLEC BIOL,BATON ROUGE,LA 70803. PENN STATE UNIV,DEPT ANTHROPOL,UNIVERSITY PK,PA 16802. LAWRENCE LIVERMORE NATL LAB,BIOL & BIOTECHNOL RES PROGRAM,CTR HUMAN GENOME,LIVERMORE,CA 94550. OI Deininger, Prescott/0000-0002-1067-3028 FU CGH CDC HHS [GH00770, GH00340]; NCRR NIH HHS [RR08205] NR 35 TC 39 Z9 40 U1 0 U2 32 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0173-0835 J9 ELECTROPHORESIS JI Electrophoresis PD SEP PY 1995 VL 16 IS 9 BP 1596 EP 1601 DI 10.1002/elps.11501601263 PG 6 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA TD110 UT WOS:A1995TD11000009 PM 8582340 ER PT J AU HAGAMAN, EW LEE, SK AF HAGAMAN, EW LEE, SK TI A CHEMICAL AND SOLID-STATE F-19 MAS NMR INVESTIGATION OF OXYGEN FUNCTIONALITY IN LIGNITE - THE FLUORINATION OF LOW-RANK COAL WITH DIETHYLAMINOSULFUR TRIFLUORIDE SO ENERGY & FUELS LA English DT Article ID MAGNETIC-RESONANCE; ASH AB The oxygen functionality in low-rank coals can be converted into their fluoride equivalents by treatment of the coal with diethylaminosulfur trifluoride (DAST). The generated fluoride functional groups are identified by solid-state F-19 MAS NMR spectroscopy. The presence and nature of oxygen functionality is inferred from these species. Resolution in the F-19 chemical shift dimension of solid-state F-19 NMR spectra of DAST-treated coals is sufficient to allow the differentiation of primary and secondary fluorides and to distinguish aromatic and aliphatic carboxylic acid fluorides. By virtue of high F-19 nuclear sensitivity and isotopic abundance, F-19 MAS NMR permits the detection of functional groups at part per thousand level. This work reports the first clear evidence for the presence of low concentrations of primary and secondary alcohols in lignite, and for the separate identification of aliphatic and aromatic carboxylic acid functions in this coal. RP HAGAMAN, EW (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831, USA. NR 18 TC 5 Z9 5 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD SEP-OCT PY 1995 VL 9 IS 5 BP 727 EP 734 DI 10.1021/ef00053a001 PG 8 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA RW991 UT WOS:A1995RW99100001 ER PT J AU THIYAGARAJAN, P HUNT, JE WINANS, RE ANDERSON, KB MILLER, JT AF THIYAGARAJAN, P HUNT, JE WINANS, RE ANDERSON, KB MILLER, JT TI TEMPERATURE-DEPENDENT STRUCTURAL-CHANGES OF ASPHALTENES IN 1-METHYLNAPHTHALENE SO ENERGY & FUELS LA English DT Article ID X-RAY-SCATTERING; POLYDISPERSITY ANALYSIS; MOLECULAR-WEIGHTS; MACROSTRUCTURE; AGGREGATION; SOLVENTS AB Small angle neutron scattering (SANS) was used to investigate the structural changes of a 5 wt % asphaltene solution in perdeuterated l-methylnaphthalene (1MN-d(10)) as a function of temperature. A special stainless steel cell was constructed and used for the measurements. The SANS data measured at various temperatures from 20 to 400 degrees C show that the scattering intensity continuously decreases with increasing temperature. The data at 20 degrees C suggested rodlike morphology for the particles, and a nonlinear curve in the Guinier plot implied polydispersity in their sizes. Maximum entropy analysis using the form factor for a cylinder allowed extraction of particle size distributions in the radius and length space. At 20 degrees C the asphaltenes self-associate in 1MN-d(10) forming long rod-shaped particles whose radius was around 18 Angstrom but vary in length over 500 Angstrom. At 50 degrees C these aggregates break down, as evidenced by the decrease in signal intensity and the radius of gyration. In the temperature range of 100-320 degrees C the maximum length of the particles decreases and the polydispersity varies in both the radius and length dimensions. Between 340 and 400 degrees C, the particles become smaller having a spherical shape with a radius around 12 Angstrom. Upon returning the sample to 20 degrees C, the SANS signal was too weak to derive any structural information, implying irreversible thermochemistry. We also carried out similar studies on the deasphalted oil (DAO) in 1MN-d(10) at 20, 100, and 200 degrees C, but the SANS signals were very weak and no changes in the scattering behavior were seen as a function of temperature. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. AMOCO CORP,NAPERVILLE,IL 60566. RP THIYAGARAJAN, P (reprint author), ARGONNE NATL LAB,DIV INTENSE PULSED NEUTRON SOURCE,ARGONNE,IL 60439, USA. NR 22 TC 66 Z9 66 U1 1 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD SEP-OCT PY 1995 VL 9 IS 5 BP 829 EP 833 DI 10.1021/ef00053a014 PG 5 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA RW991 UT WOS:A1995RW99100014 ER PT J AU DAYTON, DC FRENCH, RJ MILNE, TA AF DAYTON, DC FRENCH, RJ MILNE, TA TI DIRECT OBSERVATION OF ALKALI VAPOR RELEASE DURING BIOMASS COMBUSTION AND GASIFICATION .1. APPLICATION OF MOLECULAR-BEAM MASS-SPECTROMETRY TO SWITCHGRASS COMBUSTION SO ENERGY & FUELS LA English DT Article ID PYROLYSIS; ASH AB Electricity from biomass and biomass-derived fuels has become an attractive and viable alternative energy source. Alkali metal release during biomass combustion can cause significant problems in terms of severe fouling and slagging of heat transfer surfaces in boilers thus reducing efficiency, and in the worst case, leading to unscheduled plant shutdown. Future biomass to electricity facilities will benefit from increased efficiencies by incorporating integrated gasification combined cycle systems that use biomass combustion gases to directly drive an aeroderivative turbine. These systems will have even lower tolerances for alkali vapor release because accelerated erosion and corrosion of turbine blades results in shorter turbine lifetimes. One solution to the fouling and slagging problem is to develop methods of hot gas cleanup to reduce the amount of alkali vapor to acceptable levels. A detailed understanding of the mechanisms of alkali metal release during biomass combustion as well as identifying alkali metal containing vapors and how the vapors lead to fouling and slagging could greatly benefit the development of hot gas cleanup technology. This paper demonstrates the application of molecular beam/mass spectrometry to the study of alkali metal speciation and release during switchgrass combustion. We have successfully used this experimental technique to identify alkali metal containing species released during the combustion of switchgrass at four different conditions: 1100 degrees C in He/O-2(20%), 800 degrees C in He/O-2(20%), 1100 degrees C in He/O-2(5%), and 1100 degrees C in He/O-2(10%)/steam(20%). These conditions were chosen to study the effect of temperature, oxygen concentration, and excess steam on alkali metal release and speciation. Initial feedstock composition is the most significant factor which affects the amount and species of alkali metal released during biomass combustion. The switchgrass sample screened in the present study is high in both alkali metal (potassium) and chlorine. As a result, the predominant alkali metal containing species released during switchgrass combustion is potassium chloride. Varying the combustion condition affects the amount of alkali metal released by a factor of 2 or less. Adding excess steam to the combustion environment tends to shift the form of alkali metal release from the alkali chloride to the hydroxide. RP DAYTON, DC (reprint author), NATL RENEWABLE ENERGY LAB,DIV IND TECHNOL,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 33 TC 143 Z9 148 U1 1 U2 43 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD SEP-OCT PY 1995 VL 9 IS 5 BP 855 EP 865 DI 10.1021/ef00053a018 PG 11 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA RW991 UT WOS:A1995RW99100018 ER PT J AU SANSTAD, AH BLUMSTEIN, C STOFT, SE AF SANSTAD, AH BLUMSTEIN, C STOFT, SE TI HOW HIGH ARE OPTION VALUES IN ENERGY-EFFICIENCY INVESTMENTS SO ENERGY POLICY LA English DT Editorial Material DE OPTION VALUES; ENERGY EFFICIENCY INVESTMENTS AB High implicit discount rates in consumers' energy-efficiency investments have long been a source of controversy. In several recent papers, Hassett and Metcalf argue that the uncertainty and irreversibility attendant to such investments, and the resulting option value, account for this anomalously high implicit discounting. Using their model and data, we show that, to the contrary, their analysis falls well short of providing an explanation of this pattern. C1 UNIV CALIF BERKELEY,INST ENERGY,BERKELEY,CA 94720. RP SANSTAD, AH (reprint author), LAWRENCE BERKELEY LAB,ENERGY ANAL PROGRAM,MS 90-400,BERKELEY,CA 94720, USA. NR 20 TC 36 Z9 36 U1 0 U2 3 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA LINACRE HOUSE JORDAN HILL, OXFORD, OXON, ENGLAND OX2 8DP SN 0301-4215 J9 ENERG POLICY JI Energy Policy PD SEP PY 1995 VL 23 IS 9 BP 739 EP 743 DI 10.1016/0301-4215(95)00065-Q PG 5 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA TG324 UT WOS:A1995TG32400001 ER PT J AU BLUMSTEIN, C STOFT, SE AF BLUMSTEIN, C STOFT, SE TI TECHNICAL EFFICIENCY, PRODUCTION-FUNCTIONS AND CONSERVATION SUPPLY CURVES SO ENERGY POLICY LA English DT Article DE EFFICIENCY; CONSERVATION; INVESTMENT AB In a recent paper Huntington lays some of the groundwork for more meaningful discussions between economists and technologists on the apparent underinvestment in energy efficiency, In a discussion illustrated by a production function, he points out that the technical efficiency of economic actors should be treated as an empirical question, Huntington's groundwork can be further extended by observing that there is a close relationship between production functions and conservation supply curves, an analytical tool routinely used by technologists, Here we show that a conservation supply curve can be obtained from a production function by a simple transformation. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720. RP BLUMSTEIN, C (reprint author), UNIV CALIF BERKELEY,INST ENERGY,2539 CHANNING WAY,BERKELEY,CA 94720, USA. NR 11 TC 13 Z9 13 U1 1 U2 3 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA LINACRE HOUSE JORDAN HILL, OXFORD, OXON, ENGLAND OX2 8DP SN 0301-4215 J9 ENERG POLICY JI Energy Policy PD SEP PY 1995 VL 23 IS 9 BP 765 EP 768 DI 10.1016/0301-4215(95)00073-R PG 4 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA TG324 UT WOS:A1995TG32400004 ER PT J AU BELL, SR GUPTA, M GREENING, LA AF BELL, SR GUPTA, M GREENING, LA TI FULL-FUEL-CYCLE APPROACH TO VEHICLE EMISSIONS MODELING - A CASE-STUDY OF GASOLINE IN THE SOUTHEASTERN REGION OF THE UNITED-STATES SO ENERGY SOURCES LA English DT Article AB The use of full-fuel-cycle analysis as a scientific, economic, and policy tool for the evaluation of alternative sources of transportation energy has become increasingly widespread. However, consistent methods for performance of these types of analyses are only now becoming recognized and utilized. The work presented here provides a case study of full-fuel-cycle analysis methods applied to the evaluation of gasoline in the southeastern region of the United States. Results of the study demonstrate the significance of nonvehicle processes, such as fuel refining, in terms of energy expenditure and emissions production. Unique to this work is the application of the MOBILES mobile emissions model in the full-fuel-cycle analysis. Estimates of direct and indirect greenhouse gas production are also presented and discussed using the full-fuel-cycle analysis method. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,ENERGY ANAL PROGRAM,BERKELEY,CA. RP BELL, SR (reprint author), UNIV ALABAMA,COLL ENGN,DEPT MECH ENGN,POB 870276,TUSCALOOSA,AL 35487, USA. NR 31 TC 6 Z9 7 U1 0 U2 2 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0090-8312 J9 ENERG SOURCE JI Energy Sources PD SEP-OCT PY 1995 VL 17 IS 5 BP 535 EP 551 DI 10.1080/00908319508946101 PG 17 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA TC974 UT WOS:A1995TC97400005 ER PT J AU SEVER, LE AF SEVER, LE TI LOOKING FOR CAUSES OF NEURAL-TUBE DEFECTS - WHERE DOES THE ENVIRONMENT FIT IN SO ENVIRONMENTAL HEALTH PERSPECTIVES LA English DT Article; Proceedings Paper CT Symposium on Preventing Child Exposures to Environmental Hazards - Research and Policy Issues CY MAR 18-19, 1994 CL WASHINGTON, DC SP Childrens Environm Hlth Network, NIEHS, Univ Calif Berkeley, Sch Public Hlth Superfund Basic Res Program, Calif Dept Hlth Serv, W Alton Jones Fdn, Med Univ S Carolina, Environm Hazards Assessment Program, US EPA, Ctr Dis Control & Prevent, David and Lucile Packard Fdn, Calif Public Hlth Fdn, Impact Assessment Inc, March Dimes Birth Defects Fdn, Teratol Soc DE ANENCEPHALY; ENVIRONMENTAL EXPOSURE; NEURAL TUBE DEFECTS; PARENTAL OCCUPATION; RISK FACTORS; SPINA BIFIDA ID CENTRAL-NERVOUS-SYSTEM; CONGENITAL-MALFORMATIONS; ETIOLOGIC HETEROGENEITY; BIRTH-DEFECTS; SPINA-BIFIDA; OCCUPATIONAL EXPOSURES; PATERNAL OCCUPATION; VINYL-CHLORIDE; EPIDEMIOLOGY; HYPOTHESIS AB The neural tube defects anencephaly and spina bifida are important causes of infant mortality and morbidity. Recent studies suggest that many of these defects can be prevented by the periconceptional use of folic acid. At the same time, we do not know what causes most cases of neural tube defects and there is evidence to suggest that they are etiologically heterogeneous. Additional research needs to be directed toward the role of occupational and environmental exposures in the etiology of these defects. Importantly, studies need to examine embryologically and anatomically specific types of defects and develop accurate information on biologically relevant exposures. Exposures toward which attention needs to be directed include organic solvents; agricultural chemicals, including pesticides; water nitrates; heavy metals such as mercury; ionizing radiation; and water disinfection by products. We also recommend that additional attention be paid to mechanisms of neural tube closure and to the potential role of genetic heterogeneity in the absorption and metabolism of xenobiotics and in their effects on the neural tube. C1 PACIFIC NW LAB, DEPT HLTH RISK ASSESSMENT, RICHLAND, WA USA. NR 57 TC 36 Z9 37 U1 1 U2 6 PU NATL INST ENVIRON HEALTH SCI PI RES TRIANGLE PK PA PO BOX 12233, RES TRIANGLE PK, NC 27709 SN 0091-6765 J9 ENVIRON HEALTH PERSP JI Environ. Health Perspect. PD SEP PY 1995 VL 103 SU 6 BP 165 EP 171 DI 10.2307/3432369 PG 7 WC Environmental Sciences; Public, Environmental & Occupational Health; Toxicology SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Toxicology GA TB481 UT WOS:A1995TB48100034 PM 8549468 ER PT J AU WEST, OR SIEGRIST, RL GIERKE, JS SCHMUNK, SW LUCERO, AJ JENNINGS, HL AF WEST, OR SIEGRIST, RL GIERKE, JS SCHMUNK, SW LUCERO, AJ JENNINGS, HL TI IN-SITU MIXED REGION VAPOR STRIPPING IN LOW-PERMEABILITY MEDIA .1. PROCESS FEATURES AND LABORATORY EXPERIMENTS SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID ORGANIC-COMPOUNDS; POROUS-MEDIA; SOIL; TRICHLOROETHYLENE; SORPTION; CONTAMINATION; TRANSPORT; DIFFUSION AB This is the first paper in a three-part series on mixed region vapor stripping (MRVS) for in situ treatment of fine-grained soils contaminated by volatile organic compounds (VOCs). In this paper, the MRVS process is described followed by the results of laboratory experiments in which the efficiency of MRVS for removing trichloroethene (TCE) was measured. These experiments revealed that MRVS could rapidly remove >90% of the initial TCE from fine-grained, silty clay soils (> 80% silt and clay particles, and hydraulic conductivity < 10(-6) cm s(-1)). A spherical diffusion model for TCE mass removal during MRVS was developed and used to simulate the measured reductions in soil TCE level as a function of treatment time. The conceptual model for VOC transport was subsequently used to simulate VOC removals measured in the MRVS field tests. The field-scale evaluation of MRVS is the subject of the second paper, while model simulations of field VOC removals are described in the third paper in this series. C1 OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831. MICHIGAN TECHNOL UNIV,DEPT GEOL ENGN & SCI,HOUGHTON,MI 49931. WENCK ASSOCIATES INC,MAPLE PLAIN,MN 55359. RP WEST, OR (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. NR 28 TC 7 Z9 7 U1 0 U2 11 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD SEP PY 1995 VL 29 IS 9 BP 2191 EP 2197 DI 10.1021/es00009a007 PG 7 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA RT053 UT WOS:A1995RT05300020 PM 22280255 ER PT J AU SIEGRIST, RL WEST, OR MORRIS, MI PICKERING, DA GREENE, DW MUHR, CA DAVENPORT, DD GIERKE, JS AF SIEGRIST, RL WEST, OR MORRIS, MI PICKERING, DA GREENE, DW MUHR, CA DAVENPORT, DD GIERKE, JS TI IN-SITU MIXED REGION VAPOR STRIPPING IN LOW-PERMEABILITY MEDIA .2. FULL-SCALE FIELD EXPERIMENTS SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID SOILS AB This paper is the second in a three-part series that describes mixed region vapor stripping (MRVS) for in situ treatment of fine-grained soils contaminated by volatile organic compounds (VOCs) including trichloroethene (TCE), 1,1,1-trichloroethane (TCA), and related halocarbons. As described in this paper, MRVS processes were studied during full-scale field experiments wherein ambient or heated air was injected at high Volumetric flow rates during in situ soil mixing, and VOCs were volatilized and advectively removed from the subsurface, captured in a shroud covering the mixed region, and then treated on-site. The field test was conducted at an inactive land disposal site in southern Ohio where dense silty clay soils were contaminated by VOCs at concentrations in the 10-500 mg kg(-1) range. During the field studies, seven columns, each 3.0 m diameter and 4.6 or 6.7 m deep, were treated with ambient air (similar to 15-25 degrees C) or heated air (similar to 120-130 degrees C) injected at flow rates of 28-40 m(3) min(-1). Intensive monitoring and measurement activities defined contaminant behavior and key MRVS operation and performance parameters. The field testing revealed that MRVS could rapidly reduce the concentrations of VOCs (i.e., TCE, TCA, ...) in dense silty clay soil by 88-98%. The rate and extent of reduction was somewhat higher with the injection of heated air as compared to ambient air. Regardless of injection air temperature, as treatment progressed, the rate of VOC removal became increasingly mass transfer limited. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV HLTH SCI RES,OAK RIDGE,TN 37831. MARTIN MARIETTA ENERGY SYST INC,DIV ENVIRONM RESTORAT,PIKETON,OH 45661. MICHIGAN TECHNOL UNIV,DEPT GEOL ENGN,HOUGHTON,MI 49931. NR 23 TC 17 Z9 17 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD SEP PY 1995 VL 29 IS 9 BP 2198 EP 2207 DI 10.1021/es00009a008 PG 10 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA RT053 UT WOS:A1995RT05300021 PM 22280256 ER PT J AU GIERKE, JS WANG, CG WEST, OR SIEGRIST, RL AF GIERKE, JS WANG, CG WEST, OR SIEGRIST, RL TI IN-SITU MIXED REGION VAPOR STRIPPING IN LOW-PERMEABILITY MEDIA .3. MODELING OF FIELD-TESTS SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID SORPTION; SUBSURFACE; MECHANISMS; STEAM AB A model was developed to simulate in situ mixed region vapor stripping process for removal of volatile organic compounds from fine-textured soils. The model consists of a thermal response submodel for simulating temperature, moisture content, and exhaust gas flow rate changes in the tone being treated and a mass transfer submodel for predicting the removal of a linearly sorbing, dissolved contaminant. The treatment zone was assumed to be completely mixed. Model parameters were obtained independently from measurements and literature correlations where possible. Calibration of first-order mass transfer rates and energy in put (via soil mixing and high-pressure gas injection) was completed using the results of a full-scale field test. The calibrated thermal submodel predicted temperature changes observed in three other field tests. The model could simulate contaminant mass removal rates for the three independent tests. The mass transfer rates, ranging between 0.0009 and 0.0015 s(-1), were independent of temperature up to at least 30 degrees C but appeared to be dependent on the frequency of contact between the mixing blades and various soil depths. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RP GIERKE, JS (reprint author), MICHIGAN TECHNOL UNIV,DEPT GEOL ENGN & SCI,1400 TOWNSEND DR,HOUGHTON,MI 49931, USA. NR 19 TC 5 Z9 5 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD SEP PY 1995 VL 29 IS 9 BP 2208 EP 2216 DI 10.1021/es00009a009 PG 9 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA RT053 UT WOS:A1995RT05300022 PM 22280257 ER PT J AU PICKERING, IJ BROWN, GE TOKUNAGA, TK AF PICKERING, IJ BROWN, GE TOKUNAGA, TK TI QUANTITATIVE SPECIATION OF SELENIUM IN SOILS USING X-RAY-ABSORPTION SPECTROSCOPY SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Note ID NEAR-EDGE STRUCTURE; KESTERSON RESERVOIR; GROUNDWATER CONTAMINATION; SELENATE REDUCTION; MODEL COMPOUNDS; SEDIMENTS; CALIFORNIA; COMPLEXES; BACTERIA; SPECTRA C1 STANFORD UNIV,DEPT GEOL & ENVIRONM SCI,STANFORD,CA 94305. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720. RP PICKERING, IJ (reprint author), STANFORD LINEAR ACCELERATOR CTR,STANFORD SYNCHROTRON RADIAT LAB,POB 4349,MS 69,STANFORD,CA 94309, USA. RI Tokunaga, Tetsu/H-2790-2014; Pickering, Ingrid/A-4547-2013; OI Tokunaga, Tetsu/0000-0003-0861-6128; Pickering, Ingrid/0000-0002-0936-2994 NR 37 TC 122 Z9 124 U1 2 U2 32 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD SEP PY 1995 VL 29 IS 9 BP 2456 EP 2459 DI 10.1021/es00009a043 PG 4 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA RT053 UT WOS:A1995RT05300056 PM 22280291 ER PT J AU RIVARD, C MOENS, L ROBERTS, K BRIGHAM, J KELLEY, S AF RIVARD, C MOENS, L ROBERTS, K BRIGHAM, J KELLEY, S TI STARCH ESTERS AS BIODEGRADABLE PLASTICS - EFFECTS OF ESTER GROUP CHAIN-LENGTH AND DEGREE OF SUBSTITUTION ON ANAEROBIC BIODEGRADATION SO ENZYME AND MICROBIAL TECHNOLOGY LA English DT Article DE STARCH ESTERS; ANAEROBIC DIGESTION; DEGREE OF SUBSTITUTION ID ACETATES; NMR AB A novel series of starch esters was prepared, which varied both in degree of substitution (DS) and in ester group chain length (C-2 to C-6). Proton nuclear magnetic resonance-based characterization of esterified starch polymers was determined to be superior to standard saponification digestion (SD) analysis. The effects of starch modification on the anaerobic biodegradation potential for the polymer were assessed using the biochemical methane potential (BMP) protocol. Results indicate that increasing the starch ester group chain length necessitates lower levels of substitution to achieve substantial biologic degradation of the polymer. C1 NATL RENEWABLE ENERGY LAB,CHEM TECHNOL RES BRANCH,GOLDEN,CO 80401. RP RIVARD, C (reprint author), NATL RENEWABLE ENERGY LAB,APPL BIOL SCI BRANCH,GOLDEN,CO 80401, USA. NR 14 TC 26 Z9 29 U1 1 U2 7 PU BUTTERWORTH-HEINEMANN PI WOBURN PA 225 WILDWOOD AVE #UNITB PO BOX 4500, WOBURN, MA 01801-2084 SN 0141-0229 J9 ENZYME MICROB TECH JI Enzyme Microb. Technol. PD SEP PY 1995 VL 17 IS 9 BP 848 EP 852 DI 10.1016/0141-0229(94)00120-G PG 5 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA RR476 UT WOS:A1995RR47600012 ER PT J AU SILVERMAN, A ZUNGER, A KALISH, R ADLER, J AF SILVERMAN, A ZUNGER, A KALISH, R ADLER, J TI CORRELATED ATOMIC DISPLACEMENTS IN THE CHEMICALLY RANDOM GA1-XINXP ALLOY SO EUROPHYSICS LETTERS LA English DT Article ID III-V; SEMICONDUCTOR ALLOYS; PHASE-DIAGRAMS; MISCIBILITY GAPS; LOCAL-STRUCTURE; TERNARY ALLOYS; INP; LAYERS; MODEL; GASB AB Monte Carlo simulations of a chemically random Ga1-xInxP alloy are carried out. An interatomic potential has been parametrized to fit first-principle total-energy calculations of various ordered GaP/InP structures. Using this potential, good agreement between predicted and measured properties of the Ga1-xInxP alloy are obtained. This potential is then used to predict positions of atoms in Ga1-xInxP yielding for the phosphorous atomic-positions probability peaks at several distinct lattice locations which emerge from correlated atomic displacements. The evolution of these displaced positions with temperature is followed by molecular-dynamics calculations showing that the average thermal r.m.s. displacements ($) over bar U obey ($) over bar U-In > ($) over bar Up > ($) over bar U-Ga. C1 TECHNION ISRAEL INST TECHNOL,INST SOLID STATE,IL-32000 HAIFA,ISRAEL. NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP SILVERMAN, A (reprint author), TECHNION ISRAEL INST TECHNOL,DEPT PHYS,IL-32000 HAIFA,ISRAEL. RI Adler, Joan/K-6458-2012; Zunger, Alex/A-6733-2013 NR 31 TC 6 Z9 6 U1 1 U2 4 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD SEP 1 PY 1995 VL 31 IS 7 BP 373 EP 378 DI 10.1209/0295-5075/31/7/006 PG 6 WC Physics, Multidisciplinary SC Physics GA RU355 UT WOS:A1995RU35500006 ER PT J AU GADBOIS, DM PETERSON, S BRADBURY, EM LEHNERT, BE AF GADBOIS, DM PETERSON, S BRADBURY, EM LEHNERT, BE TI CDK4/CYCLIN D1/PCNA COMPLEXES DURING STRAUROSPORINE-INDUCED G1 ARREST AND G0 ARREST OF HUMAN FIBROBLASTS SO EXPERIMENTAL CELL RESEARCH LA English DT Article ID CATALYTIC SUBUNIT; CELL-CYCLE; MAMMALIAN-CELLS; NUCLEAR-PROTEIN; KINASE; GENE; PHOSPHORYLATION; PROGRESSION; P34(CDC2); P40(MO15) AB We have shown that staurosporine (STSP) arrests normal human diploid fibroblasts in the G1 phase of the cell cycle at a time similar to 3 h after release from low-serum-induced G0 arrest. This initial temporal mapping of the STSP-induced restriction point was based on how cytometric analyses that measured the onset of DNA synthesis after release from STSP and low-serum treatment. Here we show that the STSP-mediated arrest point distinctly differs from low-serum G0 arrest. We have found that cyclin D1 is expressed in STSP-arrested G1 fibroblasts but not in low-serum-arrested G0 fibroblasts, whereas cyclin-dependent kinase 4 (cdk4) and proliferating cell nuclear antigen (PCNA) are equivalently expressed under conditions of both STSP treatment and serum deprivation. Cdk4/cyclin D1/PCNA complexes are also formed in STSP-arrested G1 fibroblasts, but they are absent in serum-deprived G0 cells. The formation of cdk4/cyclin D1/PCNA complexes was found to coincide with the transcription and synthesis of cyclin D1, which indicates that the lack of available cyclin D1 is the limiting factor in cdk4/cyclin D1/PCNA complex formation in serum-deprived fibroblasts. This conclusion was further supported by the observation that cyclin D1-GST fusion protein binds cdk4 and PCNA when added to G0 cell extracts. Circumstantial evidence obtained in our studies and by other investigators suggests that STSP-induced arrest may be due to the inhibition of cdk-activating kinase. (C) 1995 Academic Press, Inc. C1 UNIV CALIF DAVIS,DEPT MED BIOL CHEM,DAVIS,CA 95616. RP GADBOIS, DM (reprint author), LOS ALAMOS NATL LAB,DIV LIFE SCI,CELL GROWTH DAMAGE & REPAIR GRP LS1,MS M88,LOS ALAMOS,NM 87545, USA. NR 25 TC 16 Z9 16 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0014-4827 J9 EXP CELL RES JI Exp. Cell Res. PD SEP PY 1995 VL 220 IS 1 BP 220 EP 225 DI 10.1006/excr.1995.1309 PG 6 WC Oncology; Cell Biology SC Oncology; Cell Biology GA RR763 UT WOS:A1995RR76300025 PM 7664838 ER PT J AU SWINSON, WF BATTISTE, RL LUTTRELL, LR YAHR, GT AF SWINSON, WF BATTISTE, RL LUTTRELL, LR YAHR, GT TI AN EXPERIMENTAL INVESTIGATION OF THE STRUCTURAL RESPONSE OF REACTOR-FUEL PLATES SO EXPERIMENTAL MECHANICS LA English DT Article AB In some reactors, thin fuel plates are cooled by water flowing through thin channels on either side of the plates. There is a need to know the amount of deformation in the fuel plates due to the coolant flow so that failures can be avoided. A verifiable solution to this problem in the past has not been available, An experimental-analytical solution to this problem for design purposes has been developed and is herein presented. RP SWINSON, WF (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU SOC EXPERIMENTAL MECHANICS PI BETHEL PA 7 SCHOOL STREET, BETHEL, CT 06801 SN 0014-4851 J9 EXP MECH JI Exp. Mech. PD SEP PY 1995 VL 35 IS 3 BP 212 EP 215 DI 10.1007/BF02319660 PG 4 WC Materials Science, Multidisciplinary; Mechanics; Materials Science, Characterization & Testing SC Materials Science; Mechanics GA RX575 UT WOS:A1995RX57500004 ER PT J AU CHEW, GF AF CHEW, GF TI STANDPOINT COSMOLOGY SO FOUNDATIONS OF PHYSICS LA English DT Article AB An unorthodox cosmology is based oil a notion of ''standpoint,'' distinguishing past from future, realized through Hilbert-space representation of the complex conformal group for 3+1 spacetime and associated coherent states. Physical (approximate) symmetry attaches to eight-parameter complex Poincare displacements, interpretable as growth of standpoint age (one parameter), boost of matter energy-momentum in standpoint rest frame (three parameters) and displacement of matter location ill a compact U(1)x0(4)/0(3) spacetime attached to standpoint (four parameters). An ''initial'' condition (at ''big bang'') is characterized by a huge dimensionless parameter alpha that breaks dilation invariance. Four major length scales are recognized, called ''Planck,'' ''particle,'' ''lab,'' and ''Hubble,'' with separations controlled by alpha all physical concepts, including spacetime, depend on wildness of scale separation. RP CHEW, GF (reprint author), UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, THEORET PHYS GRP, BERKELEY, CA 94720 USA. NR 12 TC 0 Z9 0 U1 1 U2 1 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0015-9018 EI 1572-9516 J9 FOUND PHYS JI Found. Phys. PD SEP PY 1995 VL 25 IS 9 BP 1283 EP 1333 DI 10.1007/BF02055333 PG 51 WC Physics, Multidisciplinary SC Physics GA TD517 UT WOS:A1995TD51700003 ER PT J AU Bak, P Paczuski, M AF Bak, P Paczuski, M TI The dynamics of fractals SO FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY LA English DT Article; Proceedings Paper CT Benoit Mandelbrot Festschrift CY FEB 02, 1995 CL CURACAO, NETH ANTILLES SP Alfred P Sloan Fdn, Banco Caribe, Curacao, Centrum Complex Syst & Visualizat, Bremen, Chamber Commerce, Curacao, Civil Engn Caribbean N V, Curacao, CITCO, Curacao, Curacao Ports Authority N V, Curacao, Curoil N V, Curacao, Mandelbrot Fdn Fractals, US, IBM Yorktown Heights, New York, Morris E Curiel & Sons, Curacao, USN, Off Naval Res, Refineria ISLA N V, Curacao, US Geol Survey, US ID SELF-ORGANIZED CRITICALITY; SIMPLE-MODEL; PUNCTUATED EQUILIBRIUM; BIOLOGICAL EVOLUTION; 1/F NOISE; AVALANCHES; GROWTH AB Fractals are formed by avalanches, driving the system toward a critical state. This critical state is a fractal in d spatial plus one temporal dimension. Long range spatial and temporal properties are described by different cuts in this fractal attractor. We unify the origin of fractals, 1/f noise, Hurst exponents, Levy flights, and punctuated equilibria in terms of avalanche dynamics, and elucidate their relationships through analytical and numerical studies of simple models. RP Bak, P (reprint author), BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. NR 43 TC 7 Z9 8 U1 1 U2 6 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0218-348X J9 FRACTALS JI Fractals-Complex Geom. Patterns Scaling Nat. Soc. PD SEP PY 1995 VL 3 IS 3 BP 415 EP 429 DI 10.1142/S0218348X95000345 PG 15 WC Mathematics, Interdisciplinary Applications; Multidisciplinary Sciences SC Mathematics; Science & Technology - Other Topics GA VB883 UT WOS:A1995VB88300003 ER PT J AU HURT, RH DAVIS, KA YANG, NYC HEADLEY, TJ MITCHELL, GD AF HURT, RH DAVIS, KA YANG, NYC HEADLEY, TJ MITCHELL, GD TI RESIDUAL CARBON FROM PULVERIZED-COAL-FIRED BOILERS .2. MORPHOLOGY AND PHYSICOCHEMICAL PROPERTIES SO FUEL LA English DT Article DE PULVERIZED COAL COMBUSTION; UNBURNT CARBON; PHYSIOCHEMICAL PROPERTIES ID FLY-ASH; PORE STRUCTURE; UNBURNT CHAR; REACTIVITY; GASIFICATION; COMBUSTION; MACERALS; RANK AB The morphology and bulk physicochemical properties of residual carbon in eight fly ash samples from commercial power plants were investigated. Enriched carbon samples extracted from the bulk fly ash were characterized by high-depth-of-field optical microscopy, reflected-light microscopy, scanning electron microscopy, elemental analysis (C, H, O), and CO2 adsorption. The crystalline structure of the carbon was characterized by X-ray diffraction, optical reflectance, and high-resolution transmission electron microscopy fringe imaging. The results were compared with measurements on laboratory-generated chars in the early-to-intermediate stages of combustion. Compared with those chars, the residual carbon is of similar elemental composition, petrographic composition and surface area but higher crystallinity. The fuel-related mechanisms that can contribute to carbon carryover in boilers are discussed, including inertinite persistence, mineral matter encapsulation and char deactivation by pregraphitization, as well as the implications for utilization of residual carbon. C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551. PENN STATE UNIV,COAL & ORGAN PETROL LABS,UNIVERSITY PK,PA 16802. NR 40 TC 76 Z9 84 U1 2 U2 11 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA LINACRE HOUSE JORDAN HILL, OXFORD, OXON, ENGLAND OX2 8DP SN 0016-2361 J9 FUEL JI Fuel PD SEP PY 1995 VL 74 IS 9 BP 1297 EP 1306 DI 10.1016/0016-2361(95)00100-J PG 10 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA RT123 UT WOS:A1995RT12300008 ER PT J AU WALL, TF BHATTACHARYA, SP BAXTER, LL RICHARDS, G HARB, JN AF WALL, TF BHATTACHARYA, SP BAXTER, LL RICHARDS, G HARB, JN TI THE CHARACTER OF ASH DEPOSITS AND THE THERMAL PERFORMANCE OF FURNACES SO FUEL PROCESSING TECHNOLOGY LA English DT Article; Proceedings Paper CT Symposium on Ash Chemistry in Fossil Fuel Processes, at the 206th American-Chemical-Society National Meeting CY AUG 22-27, 1993 CL CHICAGO, IL SP Amer Chem Soc AB The character of fireside ash deposits depend on the processes by which deposits are formed and subsequent reactions within the deposit and with furnace gases. The properties influencing furnace heat transfer, absorptivity for radiative transfer and thermal conductivity for conductive transfer are shown from many measurements to depend on this character. Illustrative trends in these properties as deposits mature and grow are presented together with their effect on furnace exit temperature and efficiency. The reflective character of initial deposits from particular coals is then considered with predictions and measurements of the spectral character of such deposits, during the first three hours of growth, using on-line FTIR spectroscopy. C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94550. BRIGHAM YOUNG UNIV,DEPT CHEM ENGN,PROVO,UT 84602. RP WALL, TF (reprint author), UNIV NEWCASTLE,DEPT CHEM ENGN,CALLAGHAN,NSW 2308,AUSTRALIA. RI Baxter, Larry/C-8567-2009; OI Baxter, Larry/0000-0002-0453-2659; Wall, Terry/0000-0002-1315-2033; Bhattacharya, Sankar/0000-0002-7590-6814 NR 12 TC 22 Z9 26 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3820 J9 FUEL PROCESS TECHNOL JI Fuel Process. Technol. PD SEP PY 1995 VL 44 IS 1-3 BP 143 EP 153 DI 10.1016/0378-3820(94)00112-7 PG 11 WC Chemistry, Applied; Energy & Fuels; Engineering, Chemical SC Chemistry; Energy & Fuels; Engineering GA RQ136 UT WOS:A1995RQ13600011 ER PT J AU KONNO, C OYAMA, Y IKEDA, Y YAMAGUCHI, S TSUDA, K KOSAKO, K MAEKAWA, H NAKAGAWA, M MORI, T NAKAMURA, T ABDOU, MA BENNETT, EF PORGES, KG YOUSSEF, MZ AF KONNO, C OYAMA, Y IKEDA, Y YAMAGUCHI, S TSUDA, K KOSAKO, K MAEKAWA, H NAKAGAWA, M MORI, T NAKAMURA, T ABDOU, MA BENNETT, EF PORGES, KG YOUSSEF, MZ TI NEUTRONICS INTEGRAL EXPERIMENTS OF SIMULATED FUSION-REACTOR BLANKET WITH VARIOUS BERYLLIUM CONFIGURATIONS USING DEUTERIUM-TRITIUM NEUTRONS SO FUSION TECHNOLOGY LA English DT Article ID PHASE-I EXPERIMENTS AB Fusion neutronics experiments are performed on a full-coverage blanket with various configurations of a beryllium neutron multiplier. In the basic experimental system, a lithium carbonate enclosure contains a lithium oxide test zone and a deuterium-tritium neutron source to simulate a neutron spectrum in a fusion reactor. Five beryllium configurations are adopted to examine the effects of neutron multiplication and reflection by beryllium. The measurements are carried out along the central line in the test Zone. Various measurement techniques are applied to obtain the tritium production rate distribution, which is one of the most important parameters for assessing the fetal tritium breeding ratio in a fusion blanket. In addition, the reaction rates and the neutron spectrum are measured to provide test data for confirmation of calculation results. These data are compared among six different configurations of the experimental system. Consistency between the different techniques for each measured parameter is also tested among different experimental systems. The experimental results are compared with the calculations by DOT3.5 using JENDL9/PRI and /PR2. The calculation differs from the experimental data by < 10%, except for the beryllium zone. C1 UNIV CALIF LOS ANGELES,SCH ENGN & APPL SCI,DEPT MECH AEROSP & NUCL ENGN,LOS ANGELES,CA 90095. ARGONNE NATL LAB,FUS POWER PROGRAM,ARGONNE,IL 60439. RP KONNO, C (reprint author), JAPAN ATOM ENERGY RES INST,TOKAI RES ESTAB,DEPT REACTOR ENGN,TOKAI,IBARAKI 31911,JAPAN. NR 25 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD SEP PY 1995 VL 28 IS 2 BP 273 EP 295 PG 23 WC Nuclear Science & Technology SC Nuclear Science & Technology GA RT526 UT WOS:A1995RT52600003 ER PT J AU OYAMA, Y KONNO, C IKEDA, Y KOSAKO, K MAEKAWA, H NAKAMURA, T ABDOU, MA BENNETT, EF KUMAR, A WATANABE, Y YOUSSEF, MZ AF OYAMA, Y KONNO, C IKEDA, Y KOSAKO, K MAEKAWA, H NAKAMURA, T ABDOU, MA BENNETT, EF KUMAR, A WATANABE, Y YOUSSEF, MZ TI CONCEPT AND CHARACTERISTICS OF A SIMULATED LINE SOURCE FOR ANNULAR BLANKET EXPERIMENTS USING AN ACCELERATOR-BASED DEUTERIUM-TRITIUM NEUTRON SOURCE SO FUSION TECHNOLOGY LA English DT Article ID HYBRID BLANKET; DESIGN; DRIVER AB A pseudoline source is realized by using an accelerator-based deuterium-tritium point-neutron source. The pseudoline source is obtained by time averaging of the continuously moving point source or by superposition of the finely distributed point sources. The line source is utilized for fusion blanket neutronics experiments with an annular geometry to simulate a part of a tokamak reactor. The source neutron characteristics are measured for two operational modes for the line source: the continuous and the stepwise modes, with activation foil and NE-213 detectors, respectively. The neutron source characteristic is calculated by a Monte Carlo code to give a source condition for a successive calculational analysis of the annular blanket experiment. The reliability of the Monte Carlo calculation is confirmed by comparison with the measured source characteristics. C1 UNIV CALIF LOS ANGELES,SCH ENGN & APPL SCI,DEPT MECH AEROSP & NUCL ENGN,LOS ANGELES,CA 90095. ARGONNE NATL LAB,FUS POWER PROGRAM,ARGONNE,IL 60439. RP OYAMA, Y (reprint author), JAPAN ATOM ENERGY RES INST,TOKAI RES ESTAB,DEPT REACTOR ENGN,TOKAI,IBARAKI 31911,JAPAN. RI Watanabe, Yoichi/D-5591-2011 OI Watanabe, Yoichi/0000-0001-8086-6442 NR 19 TC 4 Z9 4 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD SEP PY 1995 VL 28 IS 2 BP 305 EP 319 PG 15 WC Nuclear Science & Technology SC Nuclear Science & Technology GA RT526 UT WOS:A1995RT52600005 ER PT J AU KONNO, C OYAMA, Y MAEKAWA, F IKEDA, Y KOSAKO, K MAEKAWA, H ABDOU, MA BENNETT, EF KUMAR, A YOUSSEF, MZ AF KONNO, C OYAMA, Y MAEKAWA, F IKEDA, Y KOSAKO, K MAEKAWA, H ABDOU, MA BENNETT, EF KUMAR, A YOUSSEF, MZ TI NEUTRONICS INTEGRAL EXPERIMENTS OF ANNULAR BLANKET SYSTEM SIMULATING TOKAMAK REACTOR CONFIGURATION SO FUSION TECHNOLOGY LA English DT Article ID STATES COLLABORATIVE PROGRAM; PHASE-II EXPERIMENTS; TRITIUM PRODUCTION; FUSION NEUTRONICS; FNS FACILITY; PARAMETERS; SPECTRUM AB Neutronics experiments on annular blanket systems that use a pseudoline source are performed. The shape of the annular blanket system is a rectangular parallel-epiped (1300 x 1300 mm(2) and 2040 mm long) with an inner cavity of 425.5 x 425.5 mm(2) and 2040 mm long. The annular blanket consists of a 15-mm-thick first wall (Type 304 stainless steel) and 406-mm-thick breeder zone (inner lithium oxide and outer lithium carbonate). Deuterium-tritium neutron sources are set at the center of the inner cavity of the annular blanket system, and the pseudoline source is obtained by oscillating the annular blanket system back and forth in a 2-m span. Three annular blanket configurations are examined: the reference blanket, a blanket covered with 25-mm-thick graphite armor, and an armor blanket with a large opening (376 x 425.5 mm). The neutronics parameters of tritium production rate, neutron spectrum, and activation reaction rate are measured with specially developed techniques, including a multidetector data acquisition system, a spectrum weighting function method and a ramp-controlled high-voltage system. Measured parameters are compared among three different configurations of the experimental system and also with the results of a closed geometry with a point source. A calculation with the GMVP Monte Carlo code that uses the JENDL-3 nuclear data library is performed and shows agreement within 10%. The current experiment provides unique data for a higher step of benchmark to test the ability of neutronics design calculations for a realistic tokamak reactor. C1 UNIV CALIF LOS ANGELES,SCH ENGN & APPL SCI,DEPT MECH AEROSP & NUCL ENGN,LOS ANGELES,CA 90095. ARGONNE NATL LAB,FUS POWER PROGRAM,ARGONNE,IL 60439. RP KONNO, C (reprint author), JAPAN ATOM ENERGY RES INST,TOKAI RES ESTAB,DEPT REACTOR ENGN,TOKAI,IBARAKI 31911,JAPAN. NR 35 TC 5 Z9 5 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD SEP PY 1995 VL 28 IS 2 BP 347 EP 365 PG 19 WC Nuclear Science & Technology SC Nuclear Science & Technology GA RT526 UT WOS:A1995RT52600007 ER PT J AU HER, C AKSOY, IA KIMURA, S BRANDRIFF, BF WASMUTH, JJ WEINSHILBOUM, RM AF HER, C AKSOY, IA KIMURA, S BRANDRIFF, BF WASMUTH, JJ WEINSHILBOUM, RM TI HUMAN ESTROGEN SULFOTRANSFERASE GENE (STE) - CLONING, STRUCTURE, AND CHROMOSOMAL LOCALIZATION SO GENOMICS LA English DT Article ID MOLECULAR-CLONING; PHENOL SULFOTRANSFERASE; SEQUENCE-ANALYSIS; RAT-LIVER; DEHYDROEPIANDROSTERONE SULFOTRANSFERASE; HYDROXYSTEROID SULFOTRANSFERASE; MOUSE-LIVER; CDNA; EXPRESSION; FORM AB Sulfation is an important pathway in the metabolism of estrogens. We recently cloned a human liver estrogen sulfotransferase (EST) cDNA. We have now determined the structure and chromosomal localization of the EST gene, STE, as a step toward molecular genetic studies of the regulation of EST in humans. STE spans approximately 20 kb and consists of 8 exons, ranging in length from 95 to 181 bp. The locations of most exon-intron splice junctions within STE are identical to those found in a human phenol ST (PST) gene, STM, and in a rat PST gene, In addition, the locations of five STE introns are also conserved in the human dehydroepiandrosterone (DHEA) ST gene, STD. The 5'-flanking region of STE contains one CCAAT and two TATA sequences. The location of one of the TATA box elements is in excellent agreement with the site of transcription initiation as determined by 5'-rapid amplification of cDNA ends. STE was mapped to human chromosome 4q13.1 by fluorescence in situ hybridization, Cloning and structural characterization of STE will now make it possible to study potential molecular genetic mechanisms involved in the regulation of EST in human tissues. (C) 1995 Academic Press, Inc. C1 MAYO CLIN & MAYO FDN,MAYO MED SCH,DEPT PHARMACOL,ROCHESTER,MN 55905. NCI,MOLEC CARCINOGENESIS LAB,BETHESDA,MD 20892. LAWRENCE LIVERMORE NATL LAB,CTR HUMAN GENOME,BIOL & BIOTECHNOL RES PROGRAM,LIVERMORE,CA 94550. UNIV CALIF IRVINE,COLL MED,DEPT BIOL CHEM,NATL HUMAN GENOME RES CTR,IRVINE,CA 92717. FU NHGRI NIH HHS [HG00834]; NIGMS NIH HHS [R01 GM 35720, R01 GM 28157] NR 49 TC 41 Z9 44 U1 0 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD SEP 1 PY 1995 VL 29 IS 1 BP 16 EP 23 DI 10.1006/geno.1995.1210 PG 8 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA RU604 UT WOS:A1995RU60400003 PM 8530066 ER PT J AU ARCOT, SS WANG, ZY WEBER, JL DEININGER, PL BATZER, MA AF ARCOT, SS WANG, ZY WEBER, JL DEININGER, PL BATZER, MA TI ALU REPEATS - A SOURCE FOR THE GENESIS OF PRIMATE MICROSATELLITES SO GENOMICS LA English DT Article ID REPEATED SEQUENCES; FAMILY MEMBERS; HUMAN GENOME; REPETITIVE ELEMENTS; LINKAGE MAP; DNA; EVOLUTION; RETROPOSONS; POLYMORPHISMS; SUBFAMILY AB As a result of their abundance, relatively uniform distribution, and high degree of polymorphism, microsatellites and minisatellites have become valuable tools in genetic mapping, forensic identity testing, and population studies. In recent years, a number of microsatellite repeats have been found to be associated with ALu interspersed repeated DNA elements. The association of an Alu element with a microsatellite repeat could result hom the integration of an ALu element within a preexisting microsatellite repeat. Alternatively, ALu elements could have a direct role in the origin of microsatellite repeats. Errors introduced during reverse transcription of the primary transcript derived hom an Alu ''master'' gene or the accumulation of random mutations in the middle A-rich regions and oligo(dA)-rich tails of Alu elements after insertion and subsequent expansion and contraction of these sequences could result in the genesis of a microsatellite repeat, We have tested these hypotheses by a direct evolutionary comparison of the sequences of some recent Alu elements that are found only in humans and are absent from nonhuman primates, as well as some older Alu elements that are present at orthologous positions in a number of nonhuman primates. The origin of ''young'' Alu insertions, absence of sequences that resemble microsatellite repeats at the orthologous loci in chimpanzees, and the gradual expansion of microsatellite repeats in some old Alu repeats at orthologous positions within the genomes of a number of nonhuman primates suggest that Ab elements are a source for the genesis of primate microsatellite repeats. (C) 1995 Academic Press, Inc. C1 LAWRENCE LIVERMORE NATL LAB,CTR HUMAN GENOME,BIOL & BIOTECHNOL RES PROGRAM,LIVERMORE,CA 94551. MARSHFIELD MED RES FDN,MARSHFIELD,WI 54449. LOUISIANA STATE UNIV,MED CTR,STANLEY S SCOTT CANC CTR,DEPT BIOCHEM & MOLEC BIOL,NEW ORLEANS,LA 70112. ALTON OCHSNER MED FDN & OCHSNER CLIN,MOLEC GENET LAB,NEW ORLEANS,LA 70121. OI Deininger, Prescott/0000-0002-1067-3028 FU NHGRI NIH HHS [HG 00770, HG 00835] NR 48 TC 162 Z9 165 U1 4 U2 10 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD SEP 1 PY 1995 VL 29 IS 1 BP 136 EP 144 DI 10.1006/geno.1995.1224 PG 9 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA RU604 UT WOS:A1995RU60400017 PM 8530063 ER PT J AU POLYMEROPOULOS, MH IDE, S SOARES, MB LENNON, GG AF POLYMEROPOULOS, MH IDE, S SOARES, MB LENNON, GG TI SEQUENCE CHARACTERIZATION AND GENETIC-MAPPING OF THE HUMAN VSNL1 GENE, A HOMOLOG OF THE RAT VISININ-LIKE PEPTIDE RNVP1 SO GENOMICS LA English DT Note ID PROTEIN; CLONING AB In the course of isolation and sequence analysis of microsatellite repeat containing human cDNAs, we have isolated the human homologue of the rat visinin-like peptide gene. The human gene shows a high degree of conservation at both the amino acid and the DNA sequence level. The (CA)(n) microsatellite repeat embedded in the 3' untranslated region of the gene is conserved between rat and human, along with the flanking DNA sequences. We have mapped the VSNL1 gene to the short arm of chromosome 2. (C) 1995 Academic Press, Inc C1 COLUMBIA UNIV COLL PHYS & SURG,DEPT PSYCHIAT,NEW YORK,NY 10032. NEW YORK STATE PSYCHIAT INST & HOSP,NEW YORK,NY 10032. LAWRENCE LIVERMORE NATL LAB,CTR HUMAN GENOME,LIVERMORE,CA 94551. RP POLYMEROPOULOS, MH (reprint author), NIH,NATL CTR HUMAN GENOME RES,GENET DIS RES LAB,BLDG 49,ROOM 4A66,BETHESDA,MD 20892, USA. NR 10 TC 21 Z9 22 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD SEP 1 PY 1995 VL 29 IS 1 BP 273 EP 275 DI 10.1006/geno.1995.1244 PG 3 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA RU604 UT WOS:A1995RU60400037 PM 8530085 ER PT J AU LAND, LS EUSTICE, RA MACK, LE HORITA, J AF LAND, LS EUSTICE, RA MACK, LE HORITA, J TI REACTIVITY OF EVAPORITES DURING BURIAL - AN EXAMPLE FROM THE JURASSIC OF ALABAMA SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID SEDIMENTARY BASIN; FLUID INCLUSIONS; BRINES; SEAWATER; ORIGIN; DIAGENESIS; STRONTIUM; HALITE; GULF; SASKATCHEWAN AB The Jurassic Louann salt was the first significant sedimentary unit to accumulate in the Gulf of Mexico sedimentary basin. Br/Cl and Sr-87/Sr-86 ratios of halite from a single core into the top of the formation record the evaporation of normal seawater to bittern stage. The bittern zone today consists of intergrown halite and sylvite. The Br and Rb contents of the solid phases, along with Sr-87/Sr-86 ratios and Rb/Sr systematics, are inconsistent with precipitation of the existing phases from seawater evaporated in Jurassic time. Rather, petrography and fluid inclusion and solid phase chemistry from the bittern zone is consistent with postdepositional water/rock interaction which diagenetically modified a marine bittern assemblage to halite + sylvite. The chemistry of the Br- and Rb-rich saline formation waters characteristic of this area today, likewise, may reflect water/evaporite interaction during burial. C1 OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. RP LAND, LS (reprint author), UNIV TEXAS,DEPT GEOL SCI,AUSTIN,TX 78713, USA. NR 51 TC 22 Z9 24 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD SEP PY 1995 VL 59 IS 18 BP 3765 EP 3778 DI 10.1016/0016-7037(95)00262-X PG 14 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA RX607 UT WOS:A1995RX60700008 ER PT J AU BIERMAN, P GILLESPIE, A CAFFEE, M ELMORE, D AF BIERMAN, P GILLESPIE, A CAFFEE, M ELMORE, D TI ESTIMATING EROSION RATES AND EXPOSURE AGES WITH CL-36 PRODUCED BY NEUTRON-ACTIVATION SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID ACCELERATOR MASS-SPECTROMETRY; COSMOGENIC CL-36; COSMIC-RAYS; TERRESTRIAL ROCKS; INSITU PRODUCTION; STRIPA GRANITE; BE-10; AL-26; RADIOISOTOPES; GEOCHRONOLOGY AB The isotopic composition of water-soluble Cl, extracted from mineral grains in granitic rocks, appears to reflect the relative age of debris-flow fan surfaces and the erosion rate of bedrock outcrops. Our data indicate that some granitic landforms are stable landscape elements eroding on the order of meters to tens of meters per million years. Samples collected from debris-flow fan surfaces of three distinct relative ages show the expected increase of model age with time but the Cl-36-exposure ages for boulders on any particular surface Vary by a factor of more than five. The method we used for extracting Cl was designed to isolate the Cl-35(n, gamma)Cl-36 production pathway and to simplify the chemical preparation of samples. Such isolation from fluid inclusions allows direct interpretation of measured Cl-36/Cl ratios but requires a model to predict the thermal-neutron production and absorption profile below the rock surface. Using such a model, we find good agreement between measured and predicted Cl-36/Cl for eight samples collected below the ground surface as well as consistency between several groups of samples collected near one another. Using elemental abundance data for 129 granitic rocks, we modeled Cl-36/Cl supported by radiogenic neutrons and find that it varies from 4 to 125 X 10(-15) (mean = 21 +/- 18, 1 sigma). However, from the surface to a depth of 10 m, thermal neutrons resulting from muon interactions have the potential to generate more Cl-36 than do radiogenic neutrons. The production of Cl-36 in the subsurface has important implications for surface-exposure dating of young, low-altitude samples collected from moraines and debris-flow or alluvial fans, especially at ages where erosion of the boulder surface is significant or where the source area for boulders is at altitudes much higher than the landform to be dated. C1 UNIV WASHINGTON,DEPT GEOL SCI,SEATTLE,WA 98195. LAWRENCE LIVERMORE NATL LAB,CTR ACCELERATOR MASS SPECTROMETRY,LIVERMORE,CA 94550. PURDUE UNIV,DEPT PHYS,PRIME LAB,W LAFAYETTE,IN 47907. RP BIERMAN, P (reprint author), UNIV VERMONT,DEPT GEOL,BURLINGTON,VT 05401, USA. RI Caffee, Marc/K-7025-2015 OI Caffee, Marc/0000-0002-6846-8967 NR 46 TC 45 Z9 47 U1 0 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD SEP PY 1995 VL 59 IS 18 BP 3779 EP 3798 DI 10.1016/0016-7037(95)00267-4 PG 20 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA RX607 UT WOS:A1995RX60700009 ER PT J AU KETTLER, RM PALMER, DA WESOLOWSKI, DJ AF KETTLER, RM PALMER, DA WESOLOWSKI, DJ TI PREDICTIONS OF DIAGENETIC REACTIONS IN THE PRESENCE OF ORGANIC-ACIDS - COMMENT SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Review ID PARTIAL MOLAL PROPERTIES; ACETATE COMPLEXES; THERMODYNAMIC PROPERTIES; HIGH-PRESSURES; POTENTIOMETRIC DETERMINATION; STABILITY-CONSTANTS; HIGH-TEMPERATURES; AQUEOUS-SOLUTIONS; ELECTROLYTES; THORIUM(IV) C1 OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. RP KETTLER, RM (reprint author), UNIV NEBRASKA,DEPT GEOL,LINCOLN,NE 68588, USA. NR 115 TC 3 Z9 3 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD SEP PY 1995 VL 59 IS 18 BP 3843 EP 3851 DI 10.1016/0016-7037(95)00257-Z PG 9 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA RX607 UT WOS:A1995RX60700014 ER PT J AU FORTIER, SM COLE, DR WESOLOWSKI, DJ RICIPUTI, LR PATERSON, BA VALLEY, JW HORITA, J AF FORTIER, SM COLE, DR WESOLOWSKI, DJ RICIPUTI, LR PATERSON, BA VALLEY, JW HORITA, J TI DETERMINATION OF THE MAGNETITE-WATER EQUILIBRIUM OXYGEN-ISOTOPE FRACTIONATION FACTOR AT 350-DEGREES-C - A COMPARISON OF ION MICROPROBE AND LASER FLUORINATION TECHNIQUES SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Letter ID MINERALS AB A Cameca 4f ion microprobe has been used in conjunction with laser and conventional analytical techniques to measure the oxygen isotope fractionation between magnetite and water at 350 degrees C. A set of experiments in which large (10-200 mu m) magnetite crystals were grown from fine grained (0.2-2 mu m) hematite starting material using four different isotopically labelled waters yields a value of 1000 In alpha((mt-w)) = -8.47 +/- 0.23, as determined by bulk oxygen extraction using laser fluorination. The value from the ion microprobe determination based on replicate analysis of magnetite single crystals is -8.60 +/- 0.65. The bulk analysis of one of the set of four experiments was used as an internal ion microprobe standard. The good agreement between the two techniques suggests that ion microprobe analyses may permit determination of isotope fractionation factors in experiments involving only a few percent of overall exchange. C1 UNIV WISCONSIN,DEPT GEOL & GEOPHYS,MADISON,WI 53706. RP FORTIER, SM (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831, USA. RI Valley, John/B-3466-2011 OI Valley, John/0000-0003-3530-2722 NR 18 TC 10 Z9 10 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD SEP PY 1995 VL 59 IS 18 BP 3871 EP 3875 DI 10.1016/0016-7037(95)00309-N PG 5 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA RX607 UT WOS:A1995RX60700020 ER PT J AU BEARD, BL MEDARIS, LG JOHNSON, CM JELINEK, E TONIKA, J RICIPUTI, LR AF BEARD, BL MEDARIS, LG JOHNSON, CM JELINEK, E TONIKA, J RICIPUTI, LR TI GEOCHRONOLOGY AND GEOCHEMISTRY OF ECLOGITES FROM THE MARIANSKE LAZNE COMPLEX, CZECH-REPUBLIC - IMPLICATIONS FOR VARISCAN OROGENESIS SO GEOLOGISCHE RUNDSCHAU LA English DT Article; Proceedings Paper CT Evolution of Variscan (Hercynian) and Comparable Paleozoic Orogenic Belts Meeting CY FEB 17-19, 1994 CL PRAGUE, CZECH REPUBLIC SP Czech Geol Soc, Geolog Vereinig DE BOHEMIAN MASSIF; ECLOGITES; GEOCHRONOLOGY; SR AND ND ISOTOPES; MARIANSKE LAZNE COMPLEX ID HIGH-PRESSURE METAMORPHISM; U-PB ZIRCON; BOHEMIAN MASSIF; MOLDANUBIAN ZONE; OCEANIC BASALTS; TROODOS MASSIF; ION MICROPROBE; ND ISOTOPE; NE BAVARIA; ROCKS AB The Marianske Lazne complex (MLC) is located in the Bohemian Massif-along the north-western margin of the Tepla-Barrandian microplate and consists of metagabbro, amphibolite and eclogite, with subordinate amounts of serpentinite, felsic gneiss and calc-silicate rocks. The MLC is interpreted as a metaophiolite complex that marks the suture zone between the Saxothuringian rocks to the north-west and the Tepla-Barrandian microplate to the south-east. Sm-Nd geochronology of garnet-omphacite pairs from two eclogite samples yields ages of 377 +/- 7, and 367 +/- 4 Ma. Samples of eclogite and amphibolite do not define a whole rock Sm-Nd isochron, even though there is a large range in Sm/Nd ratio, implying that the suite of samples may not be cogenetic. Eclogites do not have correlated epsilon(Nd) values and initial Sr-87/Sr-86 ratios. Five of the eight eclogite samples have high epsilon(Nd) values (+10.2 to +7.1) consistent with derivation from a MORE-like source, but variable Sr-87/Sr-86 ratios (0.7033 to 0.7059) which probably reflect hydrothermal seawater alteration. Three other eclogite samples have lower epsilon(Nd) values (+5.4 to -0.8) and widely variable Sr-87/Sr-86 ratios (0.7033 to 0.7096). Such low epsilon(Nd) values are inconsistent with derivation from a MORE source and may reflect a subduction or oceanic island basalt component in their source. The MLC is an important petrotectonic element in the Bohemian Massif, providing evidence for Cambro-Ordovician formation of oceanic crust and interaction with seawater, Late Devonian (Frasnian-Famennian) high- and medium-pressure metamorphism related to closure of a Saxothuringian ocean basin, Early Carboniferous (Visean) thrusting of the Tepla terrane over Saxothuringian rocks and Late Visean extension. C1 CHARLES UNIV,DEPT GEOCHEM MINERAL & CRYSTALLOG,PRAGUE,CZECH REPUBLIC. CHARLES UNIV,DEPT ENVIRONM SCI,PRAGUE,CZECH REPUBLIC. OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. UNIV N CAROLINA,DEPT GEOL,CHAPEL HILL,NC 27599. RP BEARD, BL (reprint author), UNIV WISCONSIN,DEPT GEOL & GEOPHYS,1215 W DAYTON ST,MADISON,WI 53706, USA. NR 64 TC 55 Z9 55 U1 0 U2 4 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0016-7835 J9 GEOL RUNDSCH JI Geol. Rundsch. PD SEP PY 1995 VL 84 IS 3 BP 552 EP 567 DI 10.1007/s005310050024 PG 16 WC Geosciences, Multidisciplinary SC Geology GA RZ213 UT WOS:A1995RZ21300010 ER PT J AU ROBOCK, A TAYLOR, KE STENCHIKOV, GL LIU, Y AF ROBOCK, A TAYLOR, KE STENCHIKOV, GL LIU, Y TI GCM EVALUATION OF A MECHANISM FOR EL-NINO TRIGGERING BY THE EL CHICHON ASH CLOUD SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID SOUTHERN OSCILLATION; ATMOSPHERIC CIRCULATION; DUST CLOUD; ERUPTION; AEROSOL; SIZE; OCEAN; MODEL AB The El Chichon volcanic eruption in 1982 was immediately followed by the strongest El Nino of the century in 1982-83. we investigate a possible mechanism proposed by Hirono whereby volcanic eruptions might trigger or enhance EI Ninos. Three distributions of volcanic ash aerosol in the troposphere over the eastern Pacific Ocean were used to force simulations with a modified version of the NCAR CCM1 atmospheric general circulation model for the month of April 1982, using observed sea surface temperatures. Only in the case of mid-tropospheric heating is there a strong dynamical reaction in the atmosphere resulting in a weakening of the trade winds in the eastern Pacific Ocean north of the equator, consistent with surface wind observations and with the first part of Hirono's theory. However, the 1982 ENSO event had started before this wind anomaly, and only trade wind collapses in the western equatorial Pacific can initiate El Ninos. The results suggest that, while tropospheric aerosols from volcanic eruptions can influence atmospheric circulation, the timing and location of the El Chichon eruption and the large ENSO event that followed was a coincidence, and that Hirono's mechanism was not responsible for the strength or timing of the El Nino. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP ROBOCK, A (reprint author), UNIV MARYLAND,DEPT METEOROL,COLLEGE PK,MD 20742, USA. RI Georgiy, Stenchikov/J-8569-2013; Taylor, Karl/F-7290-2011; Robock, Alan/B-6385-2016; OI Taylor, Karl/0000-0002-6491-2135; Robock, Alan/0000-0002-6319-5656 NR 22 TC 14 Z9 14 U1 0 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD SEP 1 PY 1995 VL 22 IS 17 BP 2369 EP 2372 DI 10.1029/95GL02065 PG 4 WC Geosciences, Multidisciplinary SC Geology GA RT829 UT WOS:A1995RT82900012 ER PT J AU CHENG, CZ AF CHENG, CZ TI 3-DIMENSIONAL MAGNETOSPHERIC EQUILIBRIUM WITH ISOTROPIC PRESSURE SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID FIELD-ALIGNED CURRENTS; PLASMA; TRIAD AB In the absence of the toroidal flux, two coupled quasi two-dimensional elliptic equilibrium equations have been derived to describe self-consistent three-dimensional quasi-static magnetospheric equilibria with isotropic pressure in an optimal (psi, alpha, chi) flux coordinate system, where psi is the magnetic flux function, chi is a generalized poloidal angle, alpha = phi - delta(psi, alpha, chi), phi is the toroidal angle, delta(psi, alpha, chi) is periodic in phi, and the magnetic field is represented as B = del psi x del alpha. A three-dimensional magnetospheric equilibrium code, the MAG-3D code, has been developed by employing an iterative metric method. The MAG-3D code is the first self-consistent three-dimensional magnetospheric equilibrium code. The main difference between the three-dimensional and the two-dimensional axisymmetric solutions is that the field-aligned current and the toroidal magnetic field are finite for the three-dimensional case, but vanish for the two-dimensional axisymmetric case. The toroidal magnetic field gives rise to a geodesic magnetic field curvature and thus a magnetic drift parallel to the pressure gradient direction, which gives rise to the field-aligned current. RP CHENG, CZ (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI Cheng, Chio/K-1005-2014 NR 16 TC 30 Z9 30 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD SEP 1 PY 1995 VL 22 IS 17 BP 2401 EP 2404 DI 10.1029/95GL02308 PG 4 WC Geosciences, Multidisciplinary SC Geology GA RT829 UT WOS:A1995RT82900020 ER PT J AU BEARD, LP TRIPP, AC AF BEARD, LP TRIPP, AC TI INVESTIGATING THE RESOLUTION OF IP ARRAYS USING INVERSE-THEORY SO GEOPHYSICS LA English DT Article ID DEPTH AB Using a fast 2-D inverse solution, we examined the resolution of different resistivity/IP arrays using noisy synthetic data subject to minimum structure inversion. We compared estimated models from inversions of data from the dipole-dipole, pole-dipole, and pole-pole arrays over (1) a dipping, polarizable conductor, (2) two proximate conductive, polarizable bodies, (3) a polarizable conductor beneath conductive overburden, and (4) a thin, resistive, polarizable dike. The estimated resistivity and polarizability models obtained from inversion of the dipole-dipole data were usually similar to the pole-dipole estimated models. In the cases examined, the estimated models from the pole-pole data were more poorly resolved than the models from the other arrays. If pole-pole resistivity data contain even a fraction of a percent of Gaussian noise, the transformation of such data through superposition to equivalent data of other array types may be considerably distorted, and significant information can be lost using the pole-pole array. Though the gradient array is reputed to be more sensitive to dip than other arrays, it evidently contains little information on dip that does not also appear in dipole-dipole data, for joint inversion of dipole-dipole and gradient array data yields models virtually identical to those obtained from inversion of dipole-dipole data alone. C1 UNIV UTAH, DEPT GEOL & GEOPHYS, SALT LAKE CITY, UT 84112 USA. RP OAK RIDGE NATL LAB, DIV ENVIRONM SCI, POB 2008, OAK RIDGE, TN 37831 USA. NR 17 TC 15 Z9 16 U1 0 U2 1 PU SOC EXPLORATION GEOPHYSICISTS PI TULSA PA 8801 S YALE ST, TULSA, OK 74137 USA SN 0016-8033 EI 1942-2156 J9 GEOPHYSICS JI Geophysics PD SEP-OCT PY 1995 VL 60 IS 5 BP 1326 EP 1341 DI 10.1190/1.1443869 PG 16 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA RR669 UT WOS:A1995RR66900005 ER PT J AU DUFFY, PB CALDEIRA, K AF DUFFY, PB CALDEIRA, K TI 3-DIMENSIONAL MODEL CALCULATION OF OCEAN UPTAKE OF BOMB C-14 AND IMPLICATIONS FOR THE GLOBAL BUDGET OF BOMB C-14 SO GLOBAL BIOGEOCHEMICAL CYCLES LA English DT Article AB Two recent papers have suggested that there is an apparent imbalance in the global bomb C-14 budget. These results are based in part on calculations made using simple one-dimensional ocean models. We recalculate the ocean inventory of bomb C-14 using a three-dimensional ocean general circulation model, and find a significantly smaller inventory after about 1980 than in previous one-dimensional model estimates. Our new estimate of the ocean inventory implies that the apparent imbalance in the global budget of bomb C-14 is smaller than previously thought and is not significantly different from zero. In addition, we use our three-dimensional model to obtain whole ocean inventories of bomb C-14 during the Geochemical Ocean Sections Study (GEOSECS) period; these inventories can be used as benchmarks in calibrating one-dimensional ocean models. RP DUFFY, PB (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV GLOBAL CLIMATE RES,POB 808,LIVERMORE,CA 94551, USA. RI Caldeira, Ken/E-7914-2011 NR 10 TC 23 Z9 23 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0886-6236 J9 GLOBAL BIOGEOCHEM CY JI Glob. Biogeochem. Cycle PD SEP PY 1995 VL 9 IS 3 BP 373 EP 375 DI 10.1029/95GB01119 PG 3 WC Environmental Sciences; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Geology; Meteorology & Atmospheric Sciences GA TE224 UT WOS:A1995TE22400005 ER PT J AU KAPLAN, DI BERTSCH, PM ADRIANO, DC AF KAPLAN, DI BERTSCH, PM ADRIANO, DC TI FACILITATED TRANSPORT OF CONTAMINANT METALS THROUGH AN ACIDIFIED AQUIFER SO GROUND WATER LA English DT Article ID NATURAL-WATERS; GROUNDWATER AB A highly acidic aqueous waste containing metals was released into unlined seepage basins between 1955 and 1988 resulting in the contamination of the underlying aquifer. To provide insight about the mechanism(s) responsible for the facilitated movement of several of these contaminant metals, ground-water samples were recovered from the aquifer along a 1.02-km transect at approximately the rate of ground-water flow. Facilitated contaminant transport was attributed primarily to the poor cation-sorbing capacity of the aquifer matrix and the soluble nature of the metals in the acidic plume. Based on chemical equilibrium calculations of ground-water ultrafiltrates which agreed with results from cationic and anionic resin-exchange experiments, over 90% of each contaminant metal (Cr, Ni, Cu, Cd, Pb, and U) existed in cationic forms in the aquifer: either as soluble metals or as sorbates associated with positively charged ground-water colloids. These cationic species were not retained by the aquifer because the pH of the aquifer matrix was slightly below the measured point-of-zero charge, indicating the variable charge sites on the mineral surfaces within the aquifer likely had a net positive charge. Contaminants were associated with recovered ground-water colloids and this association increased with the pH of the system. However, mobile colloids would likely play only a small role in the transport of contaminants through this aquifer because of their relatively low concentration. C1 SAVANNAH RIVER ECOL LAB, DIV BIOGEOCHEM, AIKEN, SC 29802 USA. RP KAPLAN, DI (reprint author), PACIFIC NW LAB, TRANSPORT GEOCHEM GRP, POB 999, RICHLAND, WA 99352 USA. NR 30 TC 33 Z9 36 U1 1 U2 8 PU GROUND WATER PUBLISHING CO PI COLUMBUS PA 2600 GROUND WATER WAY, COLUMBUS, OH 43219 SN 0017-467X J9 GROUND WATER JI Ground Water PD SEP-OCT PY 1995 VL 33 IS 5 BP 708 EP 717 DI 10.1111/j.1745-6584.1995.tb00016.x PG 10 WC Geosciences, Multidisciplinary; Water Resources SC Geology; Water Resources GA RT130 UT WOS:A1995RT13000002 ER PT J AU GOODRICH, MT MCCORD, JT AF GOODRICH, MT MCCORD, JT TI QUANTIFICATION OF UNCERTAINTY IN EXPOSURE ASSESSMENTS AT HAZARDOUS-WASTE SITES SO GROUND WATER LA English DT Article AB Many of the risk assessment approaches being applied at hazardous waste sites fail to adequately account for the ground-water flow and solute transport processes (and their uncertainties) that move the contaminant from the source to the receptor. For example, one recommended model assumes the contaminant concentration at the source is equal to the contaminant concentration at the receptor. A more realistic way to estimate receptor concentrations for risk assessment would be to use technically accepted ground-water flow equations coupled with the advection-dispersion equation and use Monte Carlo techniques to address parameter uncertainty. A complex numerical model and a simple analytical model were used to simulate ground-water flow and solute transport from a hypothetical waste site to a subsurface drain using both small and larger scale hydraulic properties. Results indicate that the predicted receptor concentration is considerably lower than the source concentration when knowledge of the local hydrogeology is considered in the transport simulations. C1 SANDIA NATL LABS,DEPT ENVIRONM & WASTE MANAGEMENT TECH SUPPORT,TECH STAFF,ALBUQUERQUE,NM 87185. RP GOODRICH, MT (reprint author), IT CORP,HYDROL & GEOCHEM ASSESSMENT GRP,5301 CENT NE,SUITE 700,ALBUQUERQUE,NM 87108, USA. NR 31 TC 14 Z9 20 U1 0 U2 3 PU GROUND WATER PUBLISHING CO PI COLUMBUS PA 2600 GROUND WATER WAY, COLUMBUS, OH 43219 SN 0017-467X J9 GROUND WATER JI Ground Water PD SEP-OCT PY 1995 VL 33 IS 5 BP 727 EP 732 DI 10.1111/j.1745-6584.1995.tb00018.x PG 6 WC Geosciences, Multidisciplinary; Water Resources SC Geology; Water Resources GA RT130 UT WOS:A1995RT13000004 ER PT J AU JOHNSON, VM ROGERS, LL AF JOHNSON, VM ROGERS, LL TI LOCATION ANALYSIS IN GROUNDWATER REMEDIATION USING NEURAL NETWORKS SO GROUND WATER LA English DT Article ID DESIGN; RECLAMATION; SENSITIVITY; SIMULATION AB Formal optimization techniques, of the kind developed in operations research to aid business decision-making, show promise as tools for controlling the high costs of ground-water remediation. A major barrier to the adoption of these tools in the industry, however, is the burden they place on the computational resources of an organization, Whenever a new pumping strategy is considered, a flow and transport model must be called to evaluate its effectiveness, Since it is common for optimization techniques to examine hundreds of strategies, at the very least, the bottleneck caused by the modeling step quickly becomes prohibitive, A method has been developed which uses artificial neural networks to substitute for the full model, permitting millions of strategies to be evaluated within reasonable time-frames on conventional computer equipment, This method was applied to a 28-location pump-and-treat problem at a western Superfund site. Networks were first trained to predict mass-extraction and containment information normally generated by the 2-D model SUTRA, They were then used in an optimization procedure to identify 250 (out of over 4 million) pumping patterns which met restoration goals at minimum cost. Analyses of the winning patterns classified individual locations as popular vs, unpopular, Sensitivity analyses on each location further distinguished: (1) locations which were strong performers under most circumstances from those which depended on other locations, and (2) locations which didn't aid the cleanup from those which were actually detrimental to it. All these analyses were made possible by the rapid evaluation of patterns provided by the neural networks. C1 LAWRENCE LIVERMORE NATL LAB,DIV EARTH SCI,LIVERMORE,CA 94551. RP JOHNSON, VM (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV ENVIRONM RESTORAT,L-206,POB 808,LIVERMORE,CA 94551, USA. NR 24 TC 42 Z9 43 U1 0 U2 2 PU GROUND WATER PUBLISHING CO PI COLUMBUS PA 2600 GROUND WATER WAY, COLUMBUS, OH 43219 SN 0017-467X J9 GROUND WATER JI Ground Water PD SEP-OCT PY 1995 VL 33 IS 5 BP 749 EP 758 DI 10.1111/j.1745-6584.1995.tb00021.x PG 10 WC Geosciences, Multidisciplinary; Water Resources SC Geology; Water Resources GA RT130 UT WOS:A1995RT13000007 ER PT J AU FOSTER, M STEFANOV, J BAUDER, T SHINN, J WILSON, R AF FOSTER, M STEFANOV, J BAUDER, T SHINN, J WILSON, R TI PIEZOMETER INSTALLATION USING A CONE PENETROMETER SO GROUND WATER MONITORING AND REMEDIATION LA English DT Editorial Material AB Cone penetrometers are increasingly used for environmental site investigations. The penetrometer method can be used for geophysical and geological profiling, as well as for sampling of soil, soil gas, and ground water. With the aim of adding to the utility of the cone penetrometer, three prototype methods to install piezometers were tested. The piezometers installed by these methods are suitable for the measurement of water levels in unconfined aquifers. They cannot, however, be considered replacements for water sampling monitoring wells because they do not satisfy monitoring well construction guidelines. These guidelines are based on the assumption of holes drilled by auger or rotary drill methods and may not be appropriate for designing pen etrometer-installed monitoring wells. At present the ability to use the penetrometer rig to install piezometers reduces the number of tasks for which traditional auger and rotary drilling methods are needed and can aid project management flexibility. RP FOSTER, M (reprint author), ARGONNE NATL LAB,ENVIRONM RES SECT,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 0 TC 0 Z9 0 U1 0 U2 2 PU GROUND WATER PUBLISHING CO PI COLUMBUS PA 2600 GROUND WATER WAY, COLUMBUS, OH 43219 SN 0277-1926 J9 GROUND WATER MONIT R JI Ground Water Monit. Remediat. PD FAL PY 1995 VL 15 IS 4 BP 70 EP 73 DI 10.1111/j.1745-6592.1995.tb00553.x PG 4 WC Water Resources SC Water Resources GA TF344 UT WOS:A1995TF34400003 ER PT J AU Kahn, JR AF Kahn, JR TI Square pegs and round holes: Can the economic paradigm be used to value the wilderness? SO GROWTH AND CHANGE LA English DT Article ID VALUATION; IMPROVEMENTS; BENEFITS; QUALITY AB This paper examines whether economic valuation methods are capable of meaningfully measuring the value of the wilderness in monetary terms. Although non-monetary valuation methods are often important in policy making arenas, this paper focuses on monetary methods. Three questions are examined to determine if these economic valuation methods can contribute to the development of wilderness policy. First, are the valuation methods which have been developed by economists capable of expressing in dollar terms the value of all the services which the wilderness supplies? Second, if these valuation methods are not capable of eliciting all the relevant values, are they still useful for public policy purposes? Third, can the valuation methods be modified or can new methods be developed which can measure some of the values which have not been captured by the previously employed methods? The paper reviews existing valuation methods according to these criteria and finds that the ability to value the wilderness is limited by the shortcomings of currently employed techniques. Refinements to existing methods and potential new methods are suggested to further the valuation process. C1 OAK RIDGE NATL LAB,DIV ENERGY,OAK RIDGE,TN 37831. RP Kahn, JR (reprint author), UNIV TENNESSEE,KNOXVILLE,TN, USA. NR 32 TC 0 Z9 0 U1 1 U2 2 PU BLACKWELL PUBLISHERS PI CAMBRIDGE PA 350 MAIN STREET, STE 6, CAMBRIDGE, MA 02148-5023 SN 0017-4815 J9 GROWTH CHANGE JI Growth Change PD FAL PY 1995 VL 26 IS 4 BP 591 EP 610 DI 10.1111/j.1468-2257.1995.tb00186.x PG 20 WC Planning & Development SC Public Administration GA TR504 UT WOS:A1995TR50400005 ER PT J AU MCINROY, JF KATHREN, RL TOOHEY, RE SWINT, MJ BREITENSTEIN, BD AF MCINROY, JF KATHREN, RL TOOHEY, RE SWINT, MJ BREITENSTEIN, BD TI POSTMORTEM TISSUE CONTENTS OF AM-241 IN A PERSON WITH A MASSIVE ACUTE EXPOSURE SO HEALTH PHYSICS LA English DT Article DE AM-241; TISSUE, BODY; EXPOSURE, OCCUPATIONAL; HANFORD ACCIDENT ID STATES TRANS-URANIUM; REGISTRY REPORT; SPECIAL ISSUE; WHOLE-BODY; AMERICIUM; PLUTONIUM; INCIDENT; MODEL AB Am-241 was determined radiochemically in the tissues of USTUR Case 246, a 76-y-old man who died of cardiovascular disease 11 y after massive percutaneous exposure following a chemical explosion in a glove box. This worker was treated extensively with a chelation drug, DTPA, for over 4 y after exposure. The estimated Am-241 deposition at the time of death was 540 kBq, of which 90% was in the skeleton, 5.1% in the liver, and 3.5% in muscle and fat. Among the soft tissues, the highest concentrations were observed in liver (22 Bq g(-1)), certain cartilaginous structures such as the larynx (15 Bq g(-1)) and the red marrow (9.7 Bq g(-1)), as compared with the mean soft tissue concentration of approximately 1 Bq g(-1). Concentration in muscle was approximately that of the soft tissue average, while concentrations in the pancreas, a hilar lymph node and fat were less than the average. Concentrations in bone ash were inversely related to the ratio of ash weight to wet weight, a surrogate for bone volume-to-surface ratio. The distribution of activity in this case is reasonably consistent with that observed in another human case, when allowance is made for chelation therapy, and also tends to support more recent models of Am-241 metabolism. C1 WASHINGTON STATE UNIV, US TRANSURANIUM REGISTRIES, RICHLAND, WA 99352 USA. HANFORD ENVIRONM HLTH FDN, RICHLAND, WA 99352 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RI WSU, USTUR/I-1056-2013 NR 26 TC 8 Z9 8 U1 1 U2 5 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD SEP PY 1995 VL 69 IS 3 BP 318 EP 323 DI 10.1097/00004032-199509000-00002 PG 6 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA RP784 UT WOS:A1995RP78400003 PM 7635727 ER PT J AU SCHLENKER, RA TOOHEY, RE THOMPSON, EG OLTMAN, BG AF SCHLENKER, RA TOOHEY, RE THOMPSON, EG OLTMAN, BG TI BONE SURFACE CONCENTRATIONS AND DOSE-RATES 11 YEARS AFTER MASSIVE ACCIDENTAL EXPOSURE TO AM-241 SO HEALTH PHYSICS LA English DT Article DE HANFORD ACCIDENT; AM-241; BONE SURFACES; SPECTROMETRY, ALPHA ID AMERICIUM AB Alpha-particle spectrograms of bone samples from USTUR Case 246 were analyzed to determine the depth in tissue from which the Am-241 alpha-particles were emitted. In four samples of bone, the lack of energy straggling in the alpha spectra indicated that essentially all the Am-241 was deposited directly on the exposed bone surface, and none had been translocated to within bone volume. These findings agree well with the results of autoradiographic examination of bone samples from the same case, but are in marked contrast to findings on another case (USTUR Case 102) who had been exposed to a much smaller amount of Am-241 at a younger age and survived approximately twice as long after the exposure. It is problematical whether the lack of Am-241 redistribution, and therefore the implied absence of bone remodeling, in Case 246 was due to his advanced age at exposure or to a deterministic effect of alpha-irradiation on bone metabolism, but the observation of radiation effects on bone metabolism in former radium workers supports the latter. C1 WASHINGTON STATE UNIV, US TRASURANIUM & URANIUM REGISTRIES, RICHLAND, WA 99352 USA. RP SCHLENKER, RA (reprint author), ARGONNE NATL LAB, DIV HLTH & ENVIRONM SAFETY, 9700 S CASS AVE, ARGONNE, IL 60439 USA. RI WSU, USTUR/I-1056-2013 NR 16 TC 2 Z9 2 U1 0 U2 3 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD SEP PY 1995 VL 69 IS 3 BP 324 EP 329 DI 10.1097/00004032-199509000-00003 PG 6 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA RP784 UT WOS:A1995RP78400004 PM 7635728 ER PT J AU ROBINSON, AL SEXTRO, RG AF ROBINSON, AL SEXTRO, RG TI THE INFLUENCE OF A SUBSLAB GRAVEL LAYER AND OPEN AREA ON SOIL-GAS AND RADON ENTRY INTO 2 EXPERIMENTAL BASEMENTS SO HEALTH PHYSICS LA English DT Article DE RN-222; RN-222, INDOOR; SOIL; RADON ID TRANSPORT; PRESSURE; MONITOR; HOUSES AB Measurements of steady-state soil-gas and Rn-222 entry rates into two room-sized experimental basement structures were made for a range of structure depressurizations (0-40 Pa) and open floor areas (0-165 x 10(-4) m(2)). The structures are identical except that in one the floor slab lies directly on native soil whereas in the other the slab lies on a high-permeability gravel layer, The subslab gravel layer greatly enhances the soil-gas and radon entry rate into the structure. The radon entry rate into the structure with the subslab gravel layer is four times greater than the entry rate into the structure without the gravel layer with an open floor area of 165 x 10(-4) m(2); however the ratio increases to 30 for an open floor area of 5.0 x 10(-4) m(2). The relationship between open area and soil-gas entry rate is complex. It depends on both the amount and distribution of the open area as well as the permeability of the soil near the opening. The entry rate into the experimental structures is largely determined by the presence or absence of a subslab gravel layer. Therefore open area is a poor indicator of radon and soil-gas entry into the structures. The extension of the soil-gas pressure field created by structure depressurization is a good measure of the radon entry, The measured normalized radon entry rate into both structures has the same linear relationship with the average subslab pressure coupling regardless of open area or the presence or absence of a subslab gravel layer. The average subslab pressure coupling is an estimate of the extension of the soil-gas pressure field. A three-dimensional finite difference model correctly predicts the effect of a subslab gravel layer and different open area configurations on radon and soil-gas entry rate; however, the model underpredicts the absolute entry rate into each structure by a factor of 1.5. RP ROBINSON, AL (reprint author), LAWRENCE BERKELEY LAB, INDOOR ENVIRONM PROGRAM, 1 CYCLOTRON RD, BLDG 90-3058, BERKELEY, CA 94720 USA. RI Robinson, Allen/I-5713-2012; Robinson, Allen/M-3046-2014 OI Robinson, Allen/0000-0003-1053-7090; Robinson, Allen/0000-0002-1819-083X NR 33 TC 19 Z9 19 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD SEP PY 1995 VL 69 IS 3 BP 367 EP 377 DI 10.1097/00004032-199509000-00008 PG 11 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA RP784 UT WOS:A1995RP78400009 PM 7635733 ER PT J AU TURNER, JE HAMM, RN AF TURNER, JE HAMM, RN TI EFFECTS OF ELASTIC AND INELASTIC-SCATTERING IN GIVING ELECTRONS TORTUOUS PATHS IN MATTER SO HEALTH PHYSICS LA English DT Article DE MONTE CARLO; RADIATION, BETA; SCATTERING; ELECTRONS AB Heavy charged particles travel in essentially straight lines in matter, while electrons travel in tortuous paths. Frequent multiple elastic Coulomb scattering by atomic nuclei is often cited as the reason for this electron behavior. Heavy charged particles also undergo multiple Coulomb scattering. However, because they are massive, significant deflections occur only in rare, close encounters with nuclei. In contrast to heavy particles, the inelastic interaction of an electron with an atomic electron represents a collision with a particle of equal mass. In principle, therefore, repeated inelastic scattering of an electron can also produce large-angle deflections and thus contribute to the tortuous nature of an electron's track. To investigate the relative importance of elastic and inelastic scattering on determining the appearance of electron tracks, detailed Monte Carlo transport computations have been carried out for monoenergetic pencil beams of electrons normally incident on a water slab with initial energies from 1 keV to 1 MeV. The calculations have been performed with deflections due to (1) inelastic scattering only, (2) elastic scattering only, and (3) both types of scattering. Results are presented to show the spreading of the pencil beams with depth in the slab, the transmission through slabs of different thicknesses, and backscattering from the slab. The results show that elastic nuclear scattering is indeed the principal physical process that causes electron paths to be tortuous; however, the smaller effect of inelastic electronic scattering is far from negligible. RP TURNER, JE (reprint author), OAK RIDGE NATL LAB, DIV HLTH SCI RES, POB 2008, OAK RIDGE, TN 37831 USA. NR 7 TC 3 Z9 3 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD SEP PY 1995 VL 69 IS 3 BP 378 EP 384 DI 10.1097/00004032-199509000-00009 PG 7 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA RP784 UT WOS:A1995RP78400010 PM 7635734 ER PT J AU Collins, FS AF Collins, FS TI Evolution of a vision: Genome project origins, present and future challenges, and far-reaching benefits SO HUMAN GENOME NEWS LA English DT Article C1 NIH,NATL CTR HUMAN GENOME RES,BETHESDA,MD. US DOE,HUMAN GENOME PROGRAM,WASHINGTON,DC 20585. NR 0 TC 7 Z9 7 U1 0 U2 0 PU HUMAN GENOME MANAGE INF SYSTEM PI OAK RIDGE PA OAK RIDGE NATIONAL LABORATORY, 1060 COMMERCE PARK, OAK RIDGE, TN 37830 SN 1050-6101 J9 HUM GENOME NEWS JI Hum. Genome News PD SEP-DEC PY 1995 VL 7 IS 3-4 BP 2 EP & PG 4 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA TQ108 UT WOS:A1995TQ10800002 ER PT J AU DUNCAN, GA AF DUNCAN, GA TI DIGITAL-CONTROL SYSTEM-DESIGN FOR A UNIQUE NONLINEAR MIMO PROCESS USING QFT TECHNIQUE SO IEE PROCEEDINGS-CONTROL THEORY AND APPLICATIONS LA English DT Article DE DIGITAL CONTROL SYSTEMS; QUANTITATIVE FEEDBACK THEORY ID QUANTITATIVE FEEDBACK THEORY AB A 19-input, 106-output thermal process is closed-loop-stabilised to meet time- and frequency-domain performance criteria. A unique nonlinear process modelling technique is used to transform several nonmeasurable process parameters into two 'state-dependent linear variables' (gain and dominant pole location) with quantified uncertainty. A linear equivalent model set with quantified uncertainty is amenable to the quantitative feedback theory (QFT) design technique, and the analogue multiloop compensation was developed using QFT. Because the system primarily functions as a regulator, a simplified MIMO system decoupling method, specific to this type of process, was developed and demonstrated. The resulting digital control system is in operation on the Uranium Atomic Vapor Laser Isotope Separation Demonstration System at the Lawrence Livermore National Laboratory. RP DUNCAN, GA (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-460,LIVERMORE,CA 94551, USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU IEE-INST ELEC ENG PI HERTS PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTS, ENGLAND SG1 2AY SN 1350-2379 J9 IEE P-CONTR THEOR AP JI IEE Proc.-Control Theory Appl. PD SEP PY 1995 VL 142 IS 5 BP 466 EP 474 DI 10.1049/ip-cta:19952022 PG 9 WC Automation & Control Systems; Engineering, Electrical & Electronic; Instruments & Instrumentation SC Automation & Control Systems; Engineering; Instruments & Instrumentation GA RY572 UT WOS:A1995RY57200009 ER PT J AU MARCHIORO, TL MARTIN, DL PAYNE, WD AF MARCHIORO, TL MARTIN, DL PAYNE, WD TI UCES - AN UNDERGRADUATE CSE INITIATIVE SO IEEE COMPUTATIONAL SCIENCE & ENGINEERING LA English DT Editorial Material RP MARCHIORO, TL (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,126 WILHELM HALL,AMES,IA 50011, USA. NR 4 TC 4 Z9 4 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 1070-9924 J9 IEEE COMPUT SCI ENG JI IEEE Comput. Sci. Eng. PD FAL PY 1995 VL 2 IS 3 BP 69 EP 73 DI 10.1109/99.414884 PG 5 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic; Mathematics, Applied SC Computer Science; Engineering; Mathematics GA RV694 UT WOS:A1995RV69400009 ER PT J AU DRAPER, RN AF DRAPER, RN TI NUMERICAL-ANALYSIS SO IEEE COMPUTATIONAL SCIENCE & ENGINEERING LA English DT Editorial Material RP DRAPER, RN (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 1070-9924 J9 IEEE COMPUT SCI ENG JI IEEE Comput. Sci. Eng. PD FAL PY 1995 VL 2 IS 3 BP 74 EP 74 PG 1 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic; Mathematics, Applied SC Computer Science; Engineering; Mathematics GA RV694 UT WOS:A1995RV69400011 ER PT J AU STANSFIELD, S SHAWVER, D ROGERS, D HIGHTOWER, R AF STANSFIELD, S SHAWVER, D ROGERS, D HIGHTOWER, R TI MISSION VISUALIZATION FOR PLANNING AND TRAINING SO IEEE COMPUTER GRAPHICS AND APPLICATIONS LA English DT Editorial Material RP STANSFIELD, S (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94550, USA. NR 3 TC 4 Z9 4 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0272-1716 J9 IEEE COMPUT GRAPH JI IEEE Comput. Graph. Appl. PD SEP PY 1995 VL 15 IS 5 BP 12 EP 14 DI 10.1109/38.403821 PG 3 WC Computer Science, Software Engineering SC Computer Science GA RQ198 UT WOS:A1995RQ19800003 ER PT J AU BEACH, RJ AF BEACH, RJ TI OPTIMIZATION OF QUASI-3 LEVEL END-PUMPED Q-SWITCHED LASERS SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article AB Equations describing the pump excitation and Q-switched energy extraction of end-pumped, quasi-three level laser systems are collected, A transcendental expression relating the Q-switched laser output energy to the laser's initial gain and cavity transmission which is valid for arbitrary output coupling is derived, This expression simplifies sensitivity and optimization studies of such systems, A first order ordinary differential equation is derived which describes the rod-integrated excited state number density resulting from an arbitrary pump excitation pulse, The equation is valid for both single pass and double pass pump geometries, To illustrate the utility of the collected set of equations an end-pumped joule class, Q-switched Yb:YAG oscillator is optimized and studied. C1 LAWRENCE LIVERMORE NATL LAB,LASER PROGRAM,LIVERMORE,CA 94550. NR 19 TC 37 Z9 37 U1 0 U2 11 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD SEP PY 1995 VL 31 IS 9 BP 1606 EP 1613 DI 10.1109/3.406371 PG 8 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA RQ559 UT WOS:A1995RQ55900003 ER PT J AU HEBNER, GA AF HEBNER, GA TI GAS TEMPERATURE-DEPENDENT OUTPUT OF THE ATOMIC ARGON AND XENON LASERS SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID NUCLEAR-PUMPED LASERS; MIXTURES; GAIN; PARAMETERS; TRANSITION; HE/AR; HE AB Laser power and energy have been measured for the transitions at 1.73 and 2.03 mu m in atomic xenon, and 1.27 and 1.79 mu m in atomic argon, for gas temperatures between 290-585 K. Nuclear excitation using U-235 fission-fragments provided pump powers between 2-10 W/cm(3). Peak laser output in xenon was independent of gas temperature below 400 K. Laser output at 1.79 mu m in argon decreased monotonically with increasing gas temperature while the 1.27 mu m laser output was independent of gas temperature below 380 K. In all cases, the laser threshold increased as the gas temperature increased. RP HEBNER, GA (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 28 TC 7 Z9 7 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD SEP PY 1995 VL 31 IS 9 BP 1626 EP 1631 DI 10.1109/3.406374 PG 6 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA RQ559 UT WOS:A1995RQ55900006 ER PT J AU STULEN, RH AF STULEN, RH TI 13-NM EXTREME-ULTRAVIOLET LITHOGRAPHY SO IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS LA English DT Article ID RAY PROJECTION LITHOGRAPHY; MULTILAYER MIRRORS AB The National Technology Roadmap for Semiconductors projects the need for 0.1 micron lithography for leading-edge IC production, beginning in the year 2007. Reduction imaging using extreme ultraviolet light, one-to-one printing using X-rays, and advanced electron beam technologies are the front runners for use at this design rule. This paper describes research and development activities for projection printing using extreme ultraviolet lithography (EUVL). This approach, known as NX EUV, is the logical extension of optical projection lithography and offers many of its advantages, including robust mask technology and reduction printing while maintaining a large depth of focus (DOF) at modest K-factor. The development of this technology is now in the research and development phase. This paper reviews its current status and describes the budding blocks of a generic EUVL tool. RP STULEN, RH (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94550, USA. NR 25 TC 12 Z9 12 U1 0 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1077-260X J9 IEEE J SEL TOP QUANT JI IEEE J. Sel. Top. Quantum Electron. PD SEP PY 1995 VL 1 IS 3 BP 970 EP 975 DI 10.1109/2944.473686 PG 6 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA TF137 UT WOS:A1995TF13700030 ER PT J AU RILEY, DJ TURNER, CD AF RILEY, DJ TURNER, CD TI INTERFACING UNSTRUCTURED TETRAHEDRON GRIDS TO STRUCTURED-GRID FDTD SO IEEE MICROWAVE AND GUIDED WAVE LETTERS LA English DT Article AB Finite-element unstructured tetrahedron grids provide considerable modeling flexibility but can give rise to an extremely large number of cells when solving open-region problems, The finite-volume hybrid-grid (FVHG) algorithm enables unstructured grids to be combined with traditional structured-grid, rectangular cell, finite-difference time-domain (FDTD), thereby considerably reducing the unstructured-mesh overhead in surrounding space, In this letter, a simple technique to interface free-meshed, tetrahedron grids with FDTD is described, The two grids are directly coupled, without the need for spatial interpolation, The tetrahedron mesh is defined to terminate on a rectangular surface that may be located very close to the geometry under study, Absorbing boundary conditions are easily applied in the surrounding FDTD grid, This technique provides finite-element modeling flexibility with the benefits of explicit time differencing and limited unstructured-mesh overhead. Multimaterial regions can be solved, The FVHG algorithm has been found to be accurate and generally stable for the long-term, even with complex free meshes generated by advanced solid-modeling software. RP RILEY, DJ (reprint author), SANDIA NATL LABS,DEPT RADIAT & ELECTROMAGNET ANAL,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 0 TC 11 Z9 11 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1051-8207 J9 IEEE MICROW GUIDED W JI IEEE Microw. Guided Wave Lett. PD SEP PY 1995 VL 5 IS 9 BP 284 EP 286 DI 10.1109/75.410398 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA RR514 UT WOS:A1995RR51400002 ER PT J AU ANDERSON, RJ AF ANDERSON, RJ TI SMART - A MODULAR CONTROL ARCHITECTURE FOR TELEROBOTICS SO IEEE ROBOTICS & AUTOMATION MAGAZINE LA English DT Article ID CONTROL-SYSTEM; TIME-DELAY; TELEOPERATORS; ROBOT AB SMART (Sequential Modular Architecture for Robotics and Teleoperation) is designed to integrate the different slave devices (e.g., large hydraulic arms, mobile manipulators, gantry robots), sensors (e.g., ultra-sonic sensors, force sensors), and input devices (e.g., force/torque ball, force-reflecting master, autonomous trajectory generators) required for waste management and environmental restoration tasks. RP ANDERSON, RJ (reprint author), SANDIA NATL LABS,POB 5800,MS 1176,ALBUQUERQUE,NM 87185, USA. NR 22 TC 27 Z9 25 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1070-9932 J9 IEEE ROBOT AUTOM MAG JI IEEE Robot. Autom. Mag. PD SEP PY 1995 VL 2 IS 3 BP 10 EP 18 DI 10.1109/100.414921 PG 9 WC Automation & Control Systems; Robotics SC Automation & Control Systems; Robotics GA RV491 UT WOS:A1995RV49100003 ER PT J AU SZYMANSKI, T FANG, C AF SZYMANSKI, T FANG, C TI RANDOMIZED ROUTING OF VIRTUAL CONNECTIONS IN ESSENTIALLY NONBLOCKING LOG N-DEPTH NETWORKS SO IEEE TRANSACTIONS ON COMMUNICATIONS LA English DT Article ID MULTISTAGE INTERCONNECTION NETWORKS; MULTIPROCESSORS; PERFORMANCE AB An optimal N x N circuit switching network with theta(N) bandwidth has a lower bound of theta(N . log N) hardware, which includes all crosspoints, bits of memory and logic gates, and a lower bound of theta(log N) set-up time, To date no known self-routing circuit switching networks with explicit constructions achieve these lower bounds, In this paper we consider a randomized routing algorithm on a class of circuit switching networks called ''Extended Dilated Banyans.'' It is proven that the blocking probability of an individual connection request is O[log(b) N . (k/d)(d)], where d is the dilation factor and k is a constant, With a dilation of theta(loglog N) and a loading <1 the blocking probability is shown to approach zero, yielding an ''essentially nonblocking'' network, The hardware complexity of these networks depends upon: the internal node implementation, A space division node yields a network with theta(N . log N . loglog N) hardware and theta(log N . loglog N) set-up time. A time division node, in which the bits from each connection are dynamically concentrated in time using a ''Time-Bit-Concentrator'' circuit, yields a network with an asymptotically optimal O(N . log N) hardware and a slightly sub-optimal theta(log N . loglog N) set-up time, Both implementations improve upon the best known explicit constructions of self-routing circuit switching networks with theta(N) bandwidth, and the TDM construction meets Shannon's lower bound on the cost of such networks, It is shown that Extended Dilated Banyans can carry significantly more traffic than the Batcher-banyan switch and its variants, given equivalent hardware complexity such as logic gates, bits of memory and crosspoints. C1 SANDIA NATL LABS,LIVERMORE,CA 94551. RP SZYMANSKI, T (reprint author), MCGILL UNIV,DEPT ELECT ENGN,3480 UNIV ST,MONTREAL,PQ H3A 2A7,CANADA. NR 25 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0090-6778 J9 IEEE T COMMUN JI IEEE Trans. Commun. PD SEP PY 1995 VL 43 IS 9 BP 2521 EP 2531 DI 10.1109/26.412727 PG 11 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA RU067 UT WOS:A1995RU06700014 ER PT J AU HSU, JS SCOGGINS, BP AF HSU, JS SCOGGINS, BP TI FIELD-TEST OF MOTOR EFFICIENCY AND LOAD CHANGES THROUGH AIR-GAP TORQUE SO IEEE TRANSACTIONS ON ENERGY CONVERSION LA English DT Article ID INDUCTION AB Although air-gap torque equations have been known for several decades, this is the first known paper suggesting the use of air-gap torque to measure efficiency and load changes of electric motors in the field. Very few assumed values are required, and the method is applicable for induction motors as well as brushless-de adjustable-speed and synchronous motors. Theoretical foundation for this proposed method is presented. Experiments conducted on an adjustable-speed motor show the validity and potential of this approach. RP HSU, JS (reprint author), OAK RIDGE NATL LAB,POB 2003,K-1220,M-S 7280,OAK RIDGE,TN 37831, USA. NR 15 TC 21 Z9 22 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0885-8969 J9 IEEE T ENERGY CONVER JI IEEE Trans. Energy Convers. PD SEP PY 1995 VL 10 IS 3 BP 477 EP 483 DI 10.1109/60.464871 PG 7 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA RX287 UT WOS:A1995RX28700014 ER PT J AU BALL, GJ COREY, G NORRIS, BL AF BALL, GJ COREY, G NORRIS, BL TI GOVERNMENT, INDUSTRY, AND UTILITY DEVELOPMENT AND EVALUATION OF A MODULAR UTILITY BATTERY ENERGY-STORAGE SYSTEM SO IEEE TRANSACTIONS ON ENERGY CONVERSION LA English DT Article AB A prototype 250 kVA modular battery energy storage system was developed and tested for utility peak-shaving applications in a cooperative Department of Energy, industry, and utility project. The system consists of battery- and converter-integrated modules with AC terminals. Data on the system's energy capacity, power quality, power factor, auxiliary power, thermal regulation, speed of response, and islanding and other protective measures are presented. A simple method of identifying the presence of a defective battery was revealed during the test period. C1 SANDIA NATL LABS,DEPT 2225,ALBUQUERQUE,NM 87185. PACIFIC GAS & ELECT CO,RES & DEV,SAN RAMON,CA 94583. RP BALL, GJ (reprint author), ELECTROTEK CONCEPTS INC,480 SAN ANTONIO RD,SUITE 200,MT VIEW,CA 94040, USA. NR 3 TC 2 Z9 2 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0885-8969 J9 IEEE T ENERGY CONVER JI IEEE Trans. Energy Convers. PD SEP PY 1995 VL 10 IS 3 BP 549 EP 554 DI 10.1109/60.464881 PG 6 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA RX287 UT WOS:A1995RX28700024 ER PT J AU HSU, JS AF HSU, JS TI MONITORING OF DEFECTS IN INDUCTION-MOTORS THROUGH AIR-GAP TORQUE OBSERVATION SO IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS LA English DT Article; Proceedings Paper CT 1994 IEEE Industry-Applications-Society Annual Meeting CY OCT 02-07, 1994 CL DENVER, CO SP IEEE, Ind Applicat Soc AB This paper suggests a method to monitor defects such as cracked rotor bars and the shorted stator coils in induction motors. Air-gap torque can be calculated white the motor is running, No special down time for measurement is required, Data of the air-gap torque for a motor should be periodically kept for comparison purposes, Since more data than just a line current are taken, this method offers other potential possibilities that cannot be handled by examining only a line current. The theoretical foundation for this proposed method is presented. Experiments conducted on a 5-hp motor show the validity and potential of this approach, Further studies are planned to extend the proposed method in detail and to monitor defects developed in other types of rotating machines. RP HSU, JS (reprint author), OAK RIDGE NATL LAB, DIGITAL & POWER ELECTR RES, OAK RIDGE, TN 37831 USA. NR 11 TC 108 Z9 111 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0093-9994 EI 1939-9367 J9 IEEE T IND APPL JI IEEE Trans. Ind. Appl. PD SEP-OCT PY 1995 VL 31 IS 5 BP 1016 EP 1021 DI 10.1109/28.464514 PG 6 WC Engineering, Multidisciplinary; Engineering, Electrical & Electronic SC Engineering GA RV997 UT WOS:A1995RV99700016 ER PT J AU THOMAS, VA JONES, ME MASON, RJ AF THOMAS, VA JONES, ME MASON, RJ TI COUPLING OF THE PISCES DEVICE MODELER TO A 3-D MAXWELL FDTD SOLVER SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Note AB We show how PISCES-like semiconductor models can be joined non-invasively to finite difference time domain models for the calculation of coupled external electromagnetics. The method involves ''tricking'' the standard current boundary condition for the device model into accepting an effective parallel external capacitance. For nearly steady state device conditions we show the results for a transmission line-coupled PISCES diode to agree well with those for an ideal diode. RP THOMAS, VA (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 8 TC 3 Z9 3 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD SEP PY 1995 VL 43 IS 9 BP 2170 EP 2172 DI 10.1109/22.414557 PN 1 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA RU478 UT WOS:A1995RU47800028 ER PT J AU HIETALA, VM VAWTER, GA BRENNAN, TM HAMMONS, BE AF HIETALA, VM VAWTER, GA BRENNAN, TM HAMMONS, BE TI TRAVELING-WAVE PHOTODETECTORS FOR HIGH-POWER, LARGE-BANDWIDTH APPLICATIONS SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article ID TRANSMISSION-LINES; GAAS; SYSTEM; MIS AB The traveling-wave photodetectors (TWPD) discussed here offer theoretical quantum efficiencies approaching 100% while maintaining a very large electrical bandwidth. Additionally, they are capable of dissipating the high-power levels required for large dynamic range applications. In this paper, the power dissipation limit of the TWPD is explored. A small signal steady-state model is developed that includes the effects of electrical propagation losses along the detector. Fabrication details are presented and experimental data shows a 3 x 1250 mu m(2) detector with a 4.8-GHz bandwidth. RP HIETALA, VM (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 19 TC 72 Z9 72 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD SEP PY 1995 VL 43 IS 9 BP 2291 EP 2298 DI 10.1109/22.414580 PN 2 PG 8 WC Engineering, Electrical & Electronic SC Engineering GA RU479 UT WOS:A1995RU47900017 ER PT J AU FRIEDLANDER, B ZEIRA, A AF FRIEDLANDER, B ZEIRA, A TI OVERSAMPLED GABOR REPRESENTATION FOR TRANSIENT SIGNALS SO IEEE TRANSACTIONS ON SIGNAL PROCESSING LA English DT Article ID GAUSSIAN ELEMENTARY SIGNALS; EXPANSIONS; TRANSFORM AB In this paper, we consider the Gabor representation that uses a one sided exponential window for detection and analysis of transient signals. Earlier results on the critically sampled case are extended to the more practically useful oversampled case. For oversampling by an integer factor, we derive an explicit analytical expression for the dual window (dual frame) function required for computing the Gabor representation. Based on this expression we develop an efficient procedure for computing the Gabor coefficients. Finally, we demonstrate the performance of the method by numerical examples. C1 SIGNAL PROC TECHNOL LTD,PALO ALTO,CA 94303. RP FRIEDLANDER, B (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT ELECT & COMP ENGN,DAVIS,CA 95616, USA. NR 19 TC 21 Z9 23 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1053-587X J9 IEEE T SIGNAL PROCES JI IEEE Trans. Signal Process. PD SEP PY 1995 VL 43 IS 9 BP 2088 EP 2094 DI 10.1109/78.414770 PG 7 WC Engineering, Electrical & Electronic SC Engineering GA RU967 UT WOS:A1995RU96700005 ER PT J AU Geist, DR AF Geist, DR TI The Hanford reach: What do we stand to lose? SO ILLAHEE-JOURNAL FOR THE NORTHWEST ENVIRONMENT LA English DT Article RP Geist, DR (reprint author), PACIFIC NW NATL LAB,ECOL GRP,POB 999,MS K6-85,RICHLAND,WA 99352, USA. NR 50 TC 12 Z9 12 U1 0 U2 2 PU INST ENVIRON STUD PI SEATTLE PA UNIV WASHINGTON ENGINEERING ANNEX FM-12, SEATTLE, WA 98195 SN 1073-0478 J9 ILLAHEE JI ILLAHEE-J. Northwest Environ. PD FAL-WIN PY 1995 VL 11 IS 3-4 BP 130 EP 141 PG 12 WC Ecology; Environmental Sciences; Forestry SC Environmental Sciences & Ecology; Forestry GA UV551 UT WOS:A1995UV55100003 ER PT J AU TYNDALL, RL LEHMAN, ES BOWMAN, EK MILTON, DK BARBAREE, JM AF TYNDALL, RL LEHMAN, ES BOWMAN, EK MILTON, DK BARBAREE, JM TI HOME HUMIDIFIERS AS A POTENTIAL SOURCE OF EXPOSURE TO MICROBIAL PATHOGENS, ENDOTOXINS, AND ALLERGENS SO INDOOR AIR-INTERNATIONAL JOURNAL OF INDOOR AIR QUALITY AND CLIMATE LA English DT Article DE AEROSOLS; BACTERIA; ENDOTOXIN; LEGIONELLA ID LEGIONELLA-PNEUMOPHILA; LUNG-DISEASE; TAP WATER; INTRACELLULAR MULTIPLICATION; HYPERSENSITIVITY PNEUMONITIS; BACTERIAL-ENDOTOXIN; PUTATIVE AGENT; CONTAMINATION; AMEBAS; TRANSMISSION AB The propensity of various types of home humidifiers to support and disseminate microbial contaminants into indoor air was tested. Reservoir water and air discharged from humidifiers seeded in the laboratory or naturally contaminated in the home were analyzed by standard microbiological methods. Clinically insignificant as well as overt or potentially pathogenic microorganisms were found to colonize the reservoirs of all types of humidifiers, but only cool mist and ultrasonic units readily aerosolized bacteria and endotoxin. Only cool mist units emitted hydrophobic fungal spores. Cool mist units discharged the greatest number of water particles in the inhalable size range (4-16 mu m) while ultrasonic units were more likely to emit respirable-sized water particles (< 0.2-4 mu m). Overt pathogens isolated from humidifiers in homes included Legionella and a pathogenic Acanthamoeba. Aerosolizing humidifiers should thus be avoided if frequent, thorough cleaning of the units is not practical. C1 CONSUMER PROD SAFETY COMMISS,WASHINGTON,DC. A&G TECH ASSOCIATES,KNOXVILLE,TN. HARVARD UNIV,SCH PUBL HLTH,BOSTON,MA 02115. CTR DIS CONTROL,ATLANTA,GA 30333. RP TYNDALL, RL (reprint author), OAK RIDGE NATL LAB,POB 2008,BDG 9207 MS-8077,OAK RIDGE,TN 37831, USA. RI Milton, Donald/G-3286-2010 OI Milton, Donald/0000-0002-0550-7834 NR 38 TC 12 Z9 12 U1 0 U2 5 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0905-6947 J9 INDOOR AIR JI Indoor Air-Int. J. Indoor Air Qual. Clim. PD SEP PY 1995 VL 5 IS 3 BP 171 EP 178 DI 10.1111/j.1600-0668.1995.t01-1-00003.x PG 8 WC Construction & Building Technology; Engineering, Environmental; Public, Environmental & Occupational Health SC Construction & Building Technology; Engineering; Public, Environmental & Occupational Health GA RV746 UT WOS:A1995RV74600003 ER PT J AU DRESCHER, AC LOBASCIO, C GADGIL, AJ NAZAROFF, WW AF DRESCHER, AC LOBASCIO, C GADGIL, AJ NAZAROFF, WW TI MIXING OF A POINT-SOURCE INDOOR POLLUTANT BY FORCED-CONVECTION SO INDOOR AIR-INTERNATIONAL JOURNAL OF INDOOR AIR QUALITY AND CLIMATE LA English DT Article DE MIXING; FORCED CONVECTION; NATURAL CONVECTION; TRACER GAS; VENTILATION AB The mixing rate of pollutants emitted from indoor sources influences the effectiveness of pollutant removal by building ventilation and the potential variability of exposure for a given release scenario. Quantitative information is scant on the mixing rate and the factors that govern it. We present mixing data for an instantaneously released tracer gas, carbon monoxide, in a sealed, unoccupied room under a range of forced airflow conditions, in which the flow is induced by blowers. The resulting mixing times, from 2 to 42 minutes, are related to the mechanical power of the air jets produced by the blowers. Mixing times are found to correlate well with the inverse of the cube root of power, in accordance with theoretical predictions and experimental observations for mixing in chemical reactors. The exposure index, defined as the time-averaged concentration at a point relative to the time-averaged concentration for the room as a whole, is presented for three experimental conditions, yielding quantitative information on the appropriateness of the well-mixed hypothesis under various flow conditions. In general, the exposure period following instantaneous release of a point-source pollutant must be much greater than the mixing time for the assumption of uniform mixing to hold. The correlation between mixing time and power input is used to predict the mixing time from the mixing action of a supply air jet for a typical ventilation scenario. The predicted mixing time, tau(mix) similar to 7 min, is substantially lower than the time scale for removal by ventilation, tau(vent) similar to 48 min. Under these conditions, complete mixing of an instantaneous release, point-source pollutant would be approximately attained within the interior space well before the pollutant would be thoroughly removed by ventilation. C1 UNIV CALIF BERKELEY,DEPT CIVIL & ENVIRONM ENGN,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,INDOOR ENVIRONM PROGRAM,BERKELEY,CA 94720. RI Nazaroff, William/C-4106-2008 OI Nazaroff, William/0000-0001-5645-3357 NR 13 TC 36 Z9 37 U1 1 U2 8 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0905-6947 J9 INDOOR AIR JI Indoor Air-Int. J. Indoor Air Qual. Clim. PD SEP PY 1995 VL 5 IS 3 BP 204 EP 214 DI 10.1111/j.1600-0668.1995.t01-1-00007.x PG 11 WC Construction & Building Technology; Engineering, Environmental; Public, Environmental & Occupational Health SC Construction & Building Technology; Engineering; Public, Environmental & Occupational Health GA RV746 UT WOS:A1995RV74600007 ER PT J AU SHERMAN, M AF SHERMAN, M TI THE USE OF BLOWER-DOOR DATA SO INDOOR AIR-INTERNATIONAL JOURNAL OF INDOOR AIR QUALITY AND CLIMATE LA English DT Article DE INFILTRATION; VENTILATION; AIR LEAKAGE; INDOOR AIR QUALITY; ENERGY; BLOWER DOOR AB The role of ventilation in the housing stock is to provide fresh air and to dilute internally generated pollutants in order to assure adequate indoor air quality Blower doors are used to measure the air tightness and air leakage of building envelopes. As existing dwellings in the United States are ventilated primarily through leaks in the building shell (i.e., infiltration) rather than by whole-house mechanical ventilation systems, accurate understanding a the uses of blower-door data is critical Blower doors can be used to answer the following questions: What is the Construction Quality of the Building Envelope? Where are the Air Leakage Pathways How Tight is the Building? How Much Ventilation Does the Air Leakage Supply How Much Energy Does the Air Leakage Lose? Is this Building Too Tight? Is this Building Too Loose? When Should Mechanical Ventilation be Considered? Various ASHRAE Standards (e.g., 62, 119, and 136) are used to determine acceptable ventilation levels and energy requirements. RP SHERMAN, M (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,ENERGY PERFORMANCE BLDG GRP,BERKELEY,CA 94720, USA. NR 36 TC 19 Z9 19 U1 0 U2 10 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0905-6947 J9 INDOOR AIR JI Indoor Air-Int. J. Indoor Air Qual. Clim. PD SEP PY 1995 VL 5 IS 3 BP 215 EP 224 DI 10.1111/j.1600-0668.1995.t01-1-00008.x PG 10 WC Construction & Building Technology; Engineering, Environmental; Public, Environmental & Occupational Health SC Construction & Building Technology; Engineering; Public, Environmental & Occupational Health GA RV746 UT WOS:A1995RV74600008 ER PT J AU Zalyubovskii, II Koba, VS Kovtun, VE Kuznichenko, AV Lebedev, VN Markley, F Seminozhenko, VN Senchishin, VG AF Zalyubovskii, II Koba, VS Kovtun, VE Kuznichenko, AV Lebedev, VN Markley, F Seminozhenko, VN Senchishin, VG TI Improving the radiation resistance of polystyrene scintillators SO INSTRUMENTS AND EXPERIMENTAL TECHNIQUES LA English DT Article AB Investigations of the effect of several additives on the radiation resistance of polystyrene scintillators are discussed. A notable improvement is achieved by adding diffusion enhancers and stabilizers to the scintillating mixture of styrene +2% PT +0.02% POPOP. The best results come form the addition of 20% polyphenyloxide as a diffusion enhancer. Its ratio of light yield to initial light yield is 92% after a gamma-dose of 2.8 Mrad in air and 94% after a dose of 10 Mrad in nitrogen atmosphere. C1 UKRAINIAN ACAD SCI,INST SINGLE CRYSTALS,KHARKOV 310108,UKRAINE. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP Zalyubovskii, II (reprint author), KHARKOV AM GORKII STATE UNIV,LAB NUCL SPECT,KHARKOV 310077,UKRAINE. NR 5 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA CONSULTANTS BUREAU 233 SPRING ST, NEW YORK, NY 10013 SN 0020-4412 J9 INSTRUM EXP TECH+ JI Instrum. Exp. Tech. PD SEP-OCT PY 1995 VL 38 IS 5 BP 612 EP 617 PN 1 PG 6 WC Engineering, Multidisciplinary; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA UD317 UT WOS:A1995UD31700008 ER PT J AU ONSTOTT, EI AF ONSTOTT, EI TI CERIUM DIOXIDE AS A RECYCLE REAGENT FOR THERMOCHEMICAL HYDROGEN-PRODUCTION BY MODIFICATION OF THE SULFUR DIOXIDE-IODINE CYCLE SO INTERNATIONAL JOURNAL OF HYDROGEN ENERGY LA English DT Article ID PRASEODYMIUM; LANTHANUM; BEHAVIOR; OXIDE AB CeO2 was reacted in aqueous SO2 under SO2 pressure and steam pressure at 377K to yield a variable composition sulfite-sulfate, containing also water of hydration, admired with unreacted CeO2. On heating with I, at 745-775K, some of the sulfite was oxidized to sulfate, and hydrolysis was concurrent to yield HI. Yields of HI as large as 47% were measured. S-2 was a concomitance product also, by I-2-catalyzed disproportionation, such that sulfite consumption was 95% for both reactions. A thermochemical cycle for H-2 production utilizing CeO2 as a recycle reagent is described. Cycle stoichiometry and cycle constraints are discussed. CeO2 is the end product of the highest temperature reaction, and the enthalpy of oxidation of the by-product S-2 can be utilized in situ at > 1000K to improve thermal efficiency. RP ONSTOTT, EI (reprint author), LOS ALAMOS NATL LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545, USA. NR 12 TC 2 Z9 2 U1 1 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-3199 J9 INT J HYDROGEN ENERG JI Int. J. Hydrog. Energy PD SEP PY 1995 VL 20 IS 9 BP 693 EP 695 DI 10.1016/0360-3199(95)94385-7 PG 3 WC Chemistry, Physical; Electrochemistry; Energy & Fuels SC Chemistry; Electrochemistry; Energy & Fuels GA RL808 UT WOS:A1995RL80800001 ER PT J AU MASSOUDI, M CHRISTIE, I AF MASSOUDI, M CHRISTIE, I TI EFFECTS OF VARIABLE VISCOSITY AND VISCOUS DISSIPATION ON THE FLOW OF A 3RD-GRADE FLUID IN A PIPE SO INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS LA English DT Article ID NON-NEWTONIAN FLUID; NATURAL-CONVECTION FLOW; FLAT PLATES AB The flow of a fluid-solid mixture is very complicated and may depend on many variables, such as the physical properties of each phase and the size and shape of the solid particles. One approach to the study of these flows is to model the mixture as a non-Newtonian fluid. Much effort has been put into analyzing various transport processes in non-Newtonian fluids, such as coal slurries. Heat transfer plays an important role in the handling and processing of these fluids. In this paper, the fully developed flow of an incompressible, thermodynamically compatible fluid of grade three in a pipe is studied. The temperature of the pipe is assumed to be higher than the temperature of the fluid and the shear viscosity of the fluid is assumed to be a function of the temperature. C1 W VIRGINIA UNIV, DEPT MATH, MORGANTOWN, WV 26506 USA. RP MASSOUDI, M (reprint author), US DOE, PITTSBURGH ENERGY TECHNOL CTR, PITTSBURGH, PA 15236 USA. NR 19 TC 88 Z9 90 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0020-7462 J9 INT J NONLINEAR MECH JI Int. J. Non-Linear Mech. PD SEP PY 1995 VL 30 IS 5 BP 687 EP 699 DI 10.1016/0020-7462(95)00031-I PG 13 WC Mechanics SC Mechanics GA TK412 UT WOS:A1995TK41200007 ER PT J AU CAPASSO, L DITOTA, G JONES, KW TUNIZ, C AF CAPASSO, L DITOTA, G JONES, KW TUNIZ, C TI SYNCHROTRON-RADIATION MICROPROBE ANALYSIS OF HUMAN DENTAL CALCULI FROM AN ARCHAEOLOGICAL SITE - A NEW POSSIBLE PERSPECTIVE IN PALAEONUTRITION STUDIES SO INTERNATIONAL JOURNAL OF OSTEOARCHAEOLOGY LA English DT Article ID CHEMICAL-ANALYSIS; LEAD; FEMURS; BONES AB The X-ray microprobe at beamline X-26 of the National Synchrotron Light Source (Brookhaven National Laboratory) has been used to determine minor and trace elements in small fragments of dental calculus. This material was removed from 11 individuals found in the Norman necropolis discovered recently under the church of San Lorenzo di Aversa (Caserta, southern Italy, ca. AD 900-1200). The aim of these experiments is to develop new methods for nondestructive analysis of organic archaeological materials in studies of palaeonutrition and palaeopathology. These preliminary analyses show little variability in the main trace elements of dietary significance, such as Sr and Zn. C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. LUCAS HTS RES LABS,ANTARES MASS SPECTROMETRY,ANSTO,SYDNEY,NSW,AUSTRALIA. RP CAPASSO, L (reprint author), NATL ARCHAEOL MUSEUM,ARCHAEOL ANTHROPOL LABS,CHIETI,ITALY. NR 29 TC 4 Z9 4 U1 0 U2 5 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 1047-482X J9 INT J OSTEOARCHAEOL JI Int. J. Osteoarchaeol. PD SEP PY 1995 VL 5 IS 3 BP 282 EP 288 DI 10.1002/oa.1390050307 PG 7 WC Anthropology; Archaeology SC Anthropology; Archaeology GA TB599 UT WOS:A1995TB59900006 ER PT J AU GRADY, DE KIPP, ME AF GRADY, DE KIPP, ME TI EXPERIMENTAL-MEASUREMENT OF DYNAMIC FAILURE AND FRAGMENTATION PROPERTIES OF METALS SO INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES LA English DT Article; Proceedings Paper CT International Symposium on Dynamic Failure Mechanics of Modern Materials CY 1994 CL CALIF INST TECHNOL, PASADENA, CA HO CALIF INST TECHNOL ID STATISTICS; IMPACT AB An experimental method for determining failure and fragmentation properties of metals in catastrophic breakup events has been pursued in this work. Spherical samples of the test metals were launched at high velocities with a two-stage light-gas gun facility and subjected to controlled impulsive loading by impact on a stationary non-metallic plate. Fragmentation and motion of the debris were diagnosed with multiple flash radiography. Methods for determining critical failure properties and the fragmentation toughness of the test metals were explored. RP GRADY, DE (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 16 TC 15 Z9 20 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0020-7683 J9 INT J SOLIDS STRUCT JI Int. J. Solids Struct. PD SEP PY 1995 VL 32 IS 17-18 BP 2779 EP & DI 10.1016/0020-7683(94)00297-A PG 0 WC Mechanics SC Mechanics GA RL557 UT WOS:A1995RL55700022 ER PT J AU SCHIFFMAN, A CHANDLER, DW AF SCHIFFMAN, A CHANDLER, DW TI EXPERIMENTAL MEASUREMENTS OF STATE-RESOLVED, ROTATIONALLY INELASTIC ENERGY-TRANSFER SO INTERNATIONAL REVIEWS IN PHYSICAL CHEMISTRY LA English DT Review ID DIFFERENTIAL CROSS-SECTIONS; HOT HYDROGEN-ATOMS; DOUBLE-RESONANCE MEASUREMENTS; DIODE-LASER SPECTROSCOPY; COLLISIONS INVOLVING MOLECULES; PUMP-PROBE MEASUREMENTS; IR DOUBLE-RESONANCE; ELECTRONIC STATES; TRANSFER RATES; OH-AR AB great deal of experimental effort has been put toward measurements of integral and differential, state-to-state cross-sections for rotationally inelastic energy transfer. Throughout the years measurements in thermal gas cells, and in crossed molecular beams, have been performed at increasingly impressive levels of quantum state detail. Because the term 'rotational energy transfer' can include collisional interchange among nuclear rotational states, magnetic sublevels, electron spin and orbital quantum levels, and vibrational angular momentum states, and can also include rotation-translation/vibration energy transfer, the field is an expansive one. In this review an array of experimental studies is encapsulated, including discussion of quantum-state propensities, their known or speculative physical origins, and the success or failure of simple energy transfer models. Discussion of progress toward the development of accurate, intermolecular potential energy surfaces, and the results of classical or quantum scattering calculations, accompanies the overview of experimental work. RP SCHIFFMAN, A (reprint author), SANDIA NATL LABS, POB 969 MS 9055, LIVERMORE, CA 94551 USA. NR 184 TC 72 Z9 72 U1 1 U2 9 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 0144-235X J9 INT REV PHYS CHEM JI Int. Rev. Phys. Chem. PD SEP PY 1995 VL 14 IS 2 BP 371 EP 420 DI 10.1080/01442359509353315 PG 50 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RP928 UT WOS:A1995RP92800008 ER PT J AU KATSNELSON, MI ANTROPOV, VP HARMAN, BN VANSCHILFGAARDE, M AF KATSNELSON, MI ANTROPOV, VP HARMAN, BN VANSCHILFGAARDE, M TI MICROSCOPIC INSTANTON DYNAMICS IN MOLECULES AND CRYSTALS - TUNNELING IN NH3 SO JETP LETTERS LA English DT Article AB A method is proposed for constructing a systematic microscopic description of tunneling processes in molecules and solids. The method is based on the quasiclassical approximation (introduction of instantons) for the nuclear variables and a first-principles calculation of the electronic energy. The inverse splitting of the ground state in NH3 molecules is calculated. (C) 1995 American Institute of Physics. C1 SRI INT,MENLO PK,CA 94025. RP KATSNELSON, MI (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Katsnelson, Mikhail/D-4359-2012 NR 20 TC 4 Z9 4 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-3640 J9 JETP LETT+ JI Jetp Lett. PD SEP PY 1995 VL 62 IS 5 BP 439 EP 443 PG 5 WC Physics, Multidisciplinary SC Physics GA TE389 UT WOS:A1995TE38900010 ER PT J AU JONES, RH SIMONEN, EP AF JONES, RH SIMONEN, EP TI CONCEPTS IN PREVENTING THE EARLY STAGES OF AQUEOUS STRESS-CORROSION CRACKING SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Article AB Environmently induced crack growth generally progresses through several stages prior to component failure, including crack initiation, short-crack growth, and stage I growth. The importance of understanding early stages derives from the extended time that cracks exist in the early stages because crack velocity is slow. This slow crack growth provides an opportunity for preventing the transition into long cracks. Several important factors about short-crack behavior can be used to lessen the impact of stress-corrosion cracking life prediction requires a knowledge of the total life cycle of the crack, including the early stages; greater reliability is possible if the transition between short- and long-crack behavior is known, because component life after this transition is short; and preventative actions are move effective for short cracks rather than long cracks. RP JONES, RH (reprint author), PACIFIC NW LAB, STRUCT MAT RES GRP, POB 999, RICHLAND, WA 99352 USA. NR 8 TC 0 Z9 0 U1 1 U2 2 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1047-4838 J9 JOM-J MIN MET MAT S JI JOM-J. Miner. Met. Mater. Soc. PD SEP PY 1995 VL 47 IS 9 BP 28 EP 31 PG 4 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA RT347 UT WOS:A1995RT34700009 ER PT J AU GAFFNEY, JS ORLANDINI, KA MARLEY, NA POPP, CJ AF GAFFNEY, JS ORLANDINI, KA MARLEY, NA POPP, CJ TI MEASUREMENTS OF BE-7 AND PB-210 IN RAIN, SNOW, AND HAIL - REPLY SO JOURNAL OF APPLIED METEOROLOGY LA English DT Note C1 NEW MEXICO INST MIN & TECHNOL,DEPT CHEM,SOCORRO,NM 87801. RP GAFFNEY, JS (reprint author), ARGONNE NATL LAB,DIV ENVIRONM RES,BLDG 203,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 8 TC 4 Z9 4 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD SEP PY 1995 VL 34 IS 9 BP 2106 EP 2107 DI 10.1175/1520-0450(1995)034<2106:R>2.0.CO;2 PG 2 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA RQ591 UT WOS:A1995RQ59100019 ER PT J AU WITHROW, SP WILLIAMS, JM PRAWER, S BARBARA, D AF WITHROW, SP WILLIAMS, JM PRAWER, S BARBARA, D TI NEW CARBON NITRIDE PHASE BY HIGH-DOSE N ION-IMPLANTATION IN GLASSY-CARBON SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID FILMS AB The possibility for the synthesis of CN compounds by high-dose N implantation of glassy carbon is investigated. The changes in volume and surface morphology and the retained N concentration as a function of ion dose are reported. For both N and C (used as a control), implantation initially induces compaction in the surface region that saturates at a density above 2.6 g/cm(3). After formation of this dense surface layer, additional implantation causes the material to expand to accommodate the implanted ions and vacancies formed during the implantation process. For N the swelling is initially linear in fluence up to 5X10(17)/cm(2) with a volume increase of 16 Angstrom(3) per added id atom; this is twice the volume per atom in the compacted substrate. Above a dose of 5X10(17) N/cm(2) the swelling behavior is more complex. A phase change is observed to occur at a dose between 5X10(17) and 1X10(18)/cm(2) which is concomitant with at least some of the implanted N being driven to the surface. In addition, micron-sized surface features are seen by scanning electron microscopy, and a significant surface roughening occurs. Ion backscattering spectra have been used to characterize the implanted N profile. The maximum retained concentration was found to be 30 at. %. (C) 1995 American Institute of Physics. C1 UNIV MELBOURNE,SCH PHYS,PARKVILLE,VIC 3052,AUSTRALIA. RP WITHROW, SP (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. OI PRAWER, STEVEN/0000-0002-4959-0828 NR 34 TC 40 Z9 40 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 1 PY 1995 VL 78 IS 5 BP 3060 EP 3065 DI 10.1063/1.360057 PG 6 WC Physics, Applied SC Physics GA RR845 UT WOS:A1995RR84500026 ER PT J AU DRORY, MD DAUSKARDT, RH KANT, A RITCHIE, RO AF DRORY, MD DAUSKARDT, RH KANT, A RITCHIE, RO TI FRACTURE OF SYNTHETIC DIAMOND SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID TOUGHNESS AB The fracture behavior of synthetic diamond has been investigated using indentation methods and by the tensile testing of pre-notched fracture-mechanics type samples. Specifically, the fracture toughness of free-standing diamond plates, grown by chemically-vapor deposited (CVD) methods, was measured using Vickers indentations and by the use of disk-shaped compact-tension specimens; the latter method provides an evaluation of the through-thickness fracture properties, whereas the indentation method was performed on the nucleation surface of the sample. Measured fracture toughness (K-c) values were found to be approximately 5-6 MPa(root)m by both methods, indicating that the fracture resistance of CVD diamond does not vary appreciably with grain size (within the certainty of the testing procedures). Complications, however, arose with the fracture-mechanics testing regarding crack initiation from a relatively blunt notch; further work is needed to develop pre-cracking methods to permit more reliable fracture toughness testing of diamond. (C) 1995 American Institute of Physics. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RP DRORY, MD (reprint author), CRYSTALLUME,3506 BASSETT ST,SANTA CLARA,CA 95054, USA. RI Ritchie, Robert/A-8066-2008 OI Ritchie, Robert/0000-0002-0501-6998 NR 19 TC 35 Z9 35 U1 2 U2 10 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 1 PY 1995 VL 78 IS 5 BP 3083 EP 3088 DI 10.1063/1.360060 PG 6 WC Physics, Applied SC Physics GA RR845 UT WOS:A1995RR84500029 ER PT J AU TARVER, CM URTIEW, PA TAO, WC AF TARVER, CM URTIEW, PA TAO, WC TI EFFECTS OF TANDEM AND COLLIDING SHOCK-WAVES ON THE INITIATION OF TRIAMINOTRINITROBENZENE SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB The shock initiation of the insensitive high-explosive LX-17, which contains 92.5% triaminotrinitrobenzene and 7.5% Kel-F binder, was studied under simulated accident conditions in which two shock waves interact producing locally high pressures and temperatures. Two experimental geometries were studied using embedded manganin pressure gauges to measure the increases in pressure due to exothermic reaction at various locations as functions of time. These pressure histories were compared to ignition and growth reactive flow model calculations to determine whether a second shock compression of reacting LX-17 caused unusually rapid reaction rates and thus more extreme hazards. One experiment used a tandem flyer plate of aluminum and steel separated by a gap to shock. the LX-17 charge, allow it to rarify, and then reshock the damaged charge to even higher pressures. These experiments revealed no significant enhancement of the LX-17 reaction rates under this shock, rarefaction, and reshock loading. The second experiment used a grooved flyer plate to produce a subcritical shock wave in LX-17, which then diverged and collided, producing a Mach stem interaction at the charge axis. The threshold conditions under which the Mach stem grew to detonation were measured. The standard LX-17 ignition and growth model yielded excellent agreement with the pressure gauge records in the Mach stem interaction region. The formation of Mach stem interactions by nearly simultaneous multiple high-velocity impacts was identified as a serious shock initiation hazard for heterogeneous solid explosives. RP TARVER, CM (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR ENERGET MAT L282,LIVERMORE,CA 94550, USA. NR 19 TC 9 Z9 9 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 1 PY 1995 VL 78 IS 5 BP 3089 EP 3095 DI 10.1063/1.360061 PG 7 WC Physics, Applied SC Physics GA RR845 UT WOS:A1995RR84500030 ER PT J AU REYNA, LG SOBEHART, JR AF REYNA, LG SOBEHART, JR TI REPETITION RATE EFFECT ON THE LASER-ABLATION OF POLYMER STRUCTURES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID PULSES AB Multilayer polyimide structures may be used as an etch stop mechanism in laser ablation processing. By changing the optical properties of the polymer it is possible to better control the depth of the patterns produced by the lasers. We present the effect of the repetition rate in the ablation of multilayer structures. The results are obtained from a photothermal model that includes the light absorption by the decomposed fragments, which shield the polymer from the incoming laser beam. The model also includes an intermediate zone in which the polymer suffers a phase transition. The evolution of the temperature profiles is simulated during each pulse taking into account the pulse shape; however, a simple diffusion model is used between pulses. The results of the simulations indicate the range of values for which the multilayer structure may be used as an effective etch stop mechanism. We found that the effectiveness of the multilayer structure deteriorates for increasing repetition rates. (C) 1995 American Institute of Physics. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP REYNA, LG (reprint author), IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598, USA. NR 12 TC 9 Z9 9 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 1 PY 1995 VL 78 IS 5 BP 3423 EP 3427 DI 10.1063/1.359971 PG 5 WC Physics, Applied SC Physics GA RR845 UT WOS:A1995RR84500082 ER PT J AU HSIAO, MC MERRITT, BT PENETRANTE, BM VOGTLIN, GE WALLMAN, PH AF HSIAO, MC MERRITT, BT PENETRANTE, BM VOGTLIN, GE WALLMAN, PH TI PLASMA-ASSISTED DECOMPOSITION OF METHANOL AND TRICHLOROETHYLENE IN ATMOSPHERIC-PRESSURE AIR STREAMS BY ELECTRICAL-DISCHARGE PROCESSING SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID AC AB Experiments are presented on the plasma-assisted decomposition of dilute concentrations of methanol and trichloroethylene in atmospheric pressure air streams by electrical discharge processing. This investigation used two types of discharge reactors, a dielectric-banier and a pulsed corona discharge reactor, to study the effects of gas temperature and electrical energy input on the decomposition chemistry and byproduct formation. Our experimental data on both methanol and trichloroethylene show that, under identical gas conditions, the type of electrical discharge reactor does not affect the energy requirements for decomposition or byproduct formation. Our experiments on methanol show that discharge processing converts methanol to COx with an energy yield that increases with temperature. In contrast to the results from methanol, COx is only a minor product in the decomposition of trichloroethylene. In addition, higher temperatures decrease the energy yield for trichloroethylene. This effect may be due to increased competition from decomposition of the byproducts dichloroacetyl chloride and phosgene. In all cases plasma processing using an electrical discharge device produces CO preferentially over CO2. RP HSIAO, MC (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 21 TC 52 Z9 53 U1 1 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 1 PY 1995 VL 78 IS 5 BP 3451 EP 3456 DI 10.1063/1.359976 PG 6 WC Physics, Applied SC Physics GA RR845 UT WOS:A1995RR84500087 ER PT J AU NI, SS FREDRICKSON, JK XUN, LY AF NI, SS FREDRICKSON, JK XUN, LY TI PURIFICATION AND CHARACTERIZATION OF A NOVEL 3-CHLOROBENZOATE-REDUCTIVE DEHALOGENASE FROM THE CYTOPLASMIC MEMBRANE OF DESULFOMONILE-TIEDJEI DCB-1 SO JOURNAL OF BACTERIOLOGY LA English DT Article ID REDUCTIVE DECHLORINATION; STRAIN DCB-1; OBLIGATE ANAEROBES; BACTERIUM; OXIDATION; GROWTH AB Although reductive dehalogenation by anaerobic microorganisms offers great potential for the degradation of halocarbons, little is known about the biochemical mechanisms involved. It has previously been demonstrated that the dehalogenase activity involved in 3-chlorobenzoate dehalogenation by Desulfomonile tiedjei DCB-1 is present in the membrane fraction of the cell extracts. We report herein the purification of a 3-chlorobenzoate-reductive dehalogenase from the cytoplasmic membrane of D. tiedjei DCB-1. The dehalogenase activity was monitored by the conversion of 3-chlorobenzoate to benzoate with reduced methyl viologen as a reducing agent. The membrane fraction of the cell extracts was obtained by ultracentrifugation, and the membrane proteins were solubilized with either the detergent CHAPS (3-[(3-cholamidopropyl)-dimethylammonio]-1-propanesulfonate) or Triton X-100 in the presence of glycerol. The solubilized dehalogenase,vas purified by ammonium sulfate fractionation and a combination of anion exchange, hydroxyapatite, and hydrophobic interaction chromatographies. This procedure yielded about 7% of the total dehalogenase activity with a 120-fold increase in specific activity. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis showed that the purified dehalogenase consisted of two subunits with molecular weights of 64,000 and 37,000. The enzyme converted 3-chlorobenzoate to benzoate at its highest specific activity in 10 mM potassium phosphate buffer (pH 7.2) at 38 degrees C. The enzyme was yellow and probably a heme protein. The enzyme had an adsorbance peak at 408 nm. The dithionite-reduced enzyme displayed absorbance peaks at 416, 522, and 550 am. The dithionite-reduced enzyme was able to complex with carbon monoxide. The nature of the heme chromophore is currently unknown. C1 PACIFIC NW LAB, ENVIRONM MICROBIOL GRP, RICHLAND, WA 99352 USA. WASHINGTON STATE UNIV TRI CITIES, DEPT MICROBIOL, RICHLAND, WA 99352 USA. NR 33 TC 59 Z9 60 U1 5 U2 17 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0021-9193 J9 J BACTERIOL JI J. Bacteriol. PD SEP PY 1995 VL 177 IS 17 BP 5135 EP 5139 PG 5 WC Microbiology SC Microbiology GA RR981 UT WOS:A1995RR98100041 PM 7665493 ER PT J AU WOFSY, C KENT, UM MAO, SY METZGER, H GOLDSTEIN, B AF WOFSY, C KENT, UM MAO, SY METZGER, H GOLDSTEIN, B TI KINETICS OF TYROSINE PHOSPHORYLATION WHEN IGE DIMERS BIND TO FC-EPSILON RECEPTORS ON RAT BASOPHILIC LEUKEMIA-CELLS SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID RBL-2H3 MAST-CELLS; IMMUNOGLOBULIN-E; SIGNAL TRANSDUCTION; HISTAMINE-RELEASE; ANTIGEN-BINDING; CROSS-LINKING; DESENSITIZATION; AFFINITY; AGGREGATION; COMPLEXES AB Previously, we demonstrated that aggregates of the high affinity receptor for IgE (Fc epsilon RI), formed by the binding of chemically cross-linked oligomers of IgE, continue to signal early and late cellular responses long after the formation of new aggregates is blocked. In the present work, we explore quantitatively the relationship between aggregation of the receptors and one of the earliest biochemical changes this initiates. We compare the time course of aggregate formation, inferred from studies of the binding of dimers of IgE, and the time course of phosphorylation of tyrosines on receptor subunits when the receptors are aggregated. A simple model does not fit the data. It appears that aggregates formed late in the response are less effective signaling units than those formed initially. We propose new explanations for the persistence of the response and the unusual kinetics. C1 LOS ALAMOS NATL LAB,DIV THEORET,THEORET BIOL & BIOPHYS GRP,LOS ALAMOS,NM 87545. UNIV NEW MEXICO,DEPT MATH & STAT,ALBUQUERQUE,NM 87131. NIAMS,BETHESDA,MD 20892. FU NIGMS NIH HHS [GM35556] NR 54 TC 24 Z9 24 U1 0 U2 0 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD SEP 1 PY 1995 VL 270 IS 35 BP 20264 EP 20272 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA RR584 UT WOS:A1995RR58400008 PM 7544786 ER PT J AU KEIGHTLEY, JA ZIMMERMANN, BH MATHER, MW SPRINGER, P PASTUSZYN, A LAWRENCE, DM FEE, JA AF KEIGHTLEY, JA ZIMMERMANN, BH MATHER, MW SPRINGER, P PASTUSZYN, A LAWRENCE, DM FEE, JA TI MOLECULAR-GENETIC AND PROTEIN CHEMICAL CHARACTERIZATION OF THE CYTOCHROME BA(3) FROM THERMUS-THERMOPHILUS HB8 SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Review ID OXIDASE SUBUNIT-I; BO UBIQUINOL OXIDASE; AMINO-ACID-SEQUENCE; ARCHAEBACTERIAL TERMINAL OXIDASE; SITE-DIRECTED MUTAGENESIS; C-OXIDASE; ESCHERICHIA-COLI; NUCLEOTIDE-SEQUENCE; BRADYRHIZOBIUM-JAPONICUM; RHODOBACTER-SPHAEROIDES AB Thermus thermophilus HB8 cells grown under reduced dioxygen tensions contain a substantially increased amount of heme A, much of which appears to be due to the presence of the terminal oxidase, cytochrome ba,. We describe a purification procedure for this enzyme that yields similar to 100 mg of pure protein from 2 kg of wet mass of cells grown in less than or equal to 50 mu M O-2. Examination of the protein by SDS-polyacrylamide gel electrophoresis followed by staining with Coomassie Blue reveals one strongly staining band at similar to 35 kDa and one very weakly staining band at similar to 18 kDa as reported earlier (Zimmermann, B. H., Nitsche, C. I., Fee, J. A., Rusnak, F., and Munck, E. (1988) Proc. Natl. Acad. Sci. U. S. A. 85, 5779-5783). By contrast, treatment of the gels with AgNO3 reveals that the larger polypeptide stains quite weakly while the smaller polypeptide stains very strongly. These results suggested the presence of two polypeptides in this protein. Using partial amino acid sequences from both proteins to obtain DNA sequence information, we isolated and sequenced a portion of the Thermus chromosome containing the genes encoding the larger protein, subunit I (cbaA), and the smaller protein, subunit II (cbaB). The two polypeptides were isolated using reversed phase liquid chromatography, and their mole percent amino acid compositions are consistent with the proposed translation of their respective genes. The two genes appear to be part of a larger operon, but we have not extended the sequencing to identify initiation and termination sequences. The deduced amino acid sequence of subunit I includes the six canonical histidine residues involved in binding the low spin heme B and the binuclear center Cu-B/heme A. These and other conserved amino acids are placed along the polypeptide among alternating hydrophobic and hydrophilic segments in a pattern that shows clear homology to other members of the heme- and copper-requiring terminal oxidases. The deduced amino acid sequence of the subunit II contains the Cu-A binding motif, including two cysteines, two histidines, and a methionine, but, in contrast to most other subunits II, it has only one region of hydrophobic sequence near its N terminus. Alignment of these two polypeptides with other cytochrome c and quinol oxidases, combined with secondary structure analysis and previous spectral studies, clearly establish cytochrome ba(3) as a bona fide member of the superfamily of heme- and copper-requiring oxidases. The alignments further indicate that cytochrome ba(3) is phylogenetically distant from other cytochrome c and quinol oxidases, and they substantially decrease the number of conserved amino acid residues. C1 UNIV CALIF SAN DIEGO,DEPT BIOL,LA JOLLA,CA 92093. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV NEW MEXICO,PROT CHEM LAB,ALBUQUERQUE,NM 87131. UNIV NEW MEXICO,DEPT BIOL,ALBUQUERQUE,NM 87131. FU NIGMS NIH HHS [GM35342] NR 102 TC 68 Z9 71 U1 0 U2 8 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD SEP 1 PY 1995 VL 270 IS 35 BP 20345 EP 20358 PG 14 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA RR584 UT WOS:A1995RR58400020 PM 7657607 ER PT J AU PEDEN, CHF BELTON, DN SCHMIEG, SJ AF PEDEN, CHF BELTON, DN SCHMIEG, SJ TI STRUCTURE SENSITIVE SELECTIVITY OF THE NO-CO REACTION OVER RH(110) AND RH(111) SO JOURNAL OF CATALYSIS LA English DT Article ID SUPPORTED RHODIUM CATALYSTS; NITRIC-OXIDE; CARBON-MONOXIDE; SURFACE-STRUCTURE; SINGLE-CRYSTAL; NO+CO REACTION; REACTION-RATES; ADSORPTION; KINETICS; RH(100) AB We have studied the effects of temperature, NO conversion, and NO-CO ratio on the activity and selectivity of the NO-CO reaction at high (1 Torr < P < 100 Torr) pressures over the Rh(110) and Rh(111) surfaces. Under the conditions used in this study, the NO-CO activity, as measured by the rate of NO loss, is between 1.3 and 6.3 times faster over Rh(110) than over Rh(111), The (110) surface exhibits a lower apparent activation energy (E(a)), 27.2 vs 34.8 kcal/mol, than does the (111) surface. We attribute this behavior to a slightly more facile NO dissociation process on the more open (110) surface. Although the turnover numbers for NO reaction can be quite similar on the two different surfaces, we find large differences between Rh(110) and Rh(111) with regard to their selectivities for the two competitive nitrogen-containing products, N2O vs N-2. The more open Rh(110) surface tends to make significantly less N2O than Rh(111) under virtually all conditions that we probed with these experiments, This can be understood in terms of the relative surface coverages of adsorbed NO and N atoms on the two surfaces, Notably, more facile NO dissociation on Rh(110) appears to lead to greater steady-state concentrations of adsorbed N atoms than is present on the (111) surface. Higher N atom coverages on the (110) surface favor N atom recombination (N-2 formation) more than the NO + N reaction (N2O formation) on Rh(110) relative to Rh(111). Indeed, Rh(110) surfaces were found to be largely composed of adsorbed N atoms and lesser quantities of NO in postreaction XPS measurements. In contrast, Rh(111) surfaces showed only X-ray photoelectron spectroscopy features due to adsorbed NO. (C) 1995 Academic Press, Inc. C1 GM CORP, CTR RES & DEV, DEPT PHYS CHEM, WARREN, MI 48090 USA. RP PEDEN, CHF (reprint author), PACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, POB 999, RICHLAND, WA 99352 USA. OI Schmieg, Steven/0000-0002-1507-207X; Peden, Charles/0000-0001-6754-9928 NR 49 TC 86 Z9 86 U1 3 U2 16 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0021-9517 J9 J CATAL JI J. Catal. PD SEP 1 PY 1995 VL 155 IS 2 BP 204 EP 218 DI 10.1006/jcat.1995.1204 PG 15 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA RQ574 UT WOS:A1995RQ57400004 ER PT J AU MATSUOKA, K BASSHAM, DC RAIKHEL, NV NAKAMURA, K AF MATSUOKA, K BASSHAM, DC RAIKHEL, NV NAKAMURA, K TI DIFFERENT SENSITIVITY TO WORTMANNIN OF 2 VACUOLAR SORTING SIGNALS INDICATES THE PRESENCE OF DISTINCT SORTING MACHINERIES IN TOBACCO CELLS SO JOURNAL OF CELL BIOLOGY LA English DT Article ID HYDROXYPROLINE-CONTAINING PROTEINS; CARBOXYL-TERMINAL PROPEPTIDE; BARLEY LECTIN; PHOSPHATIDYLINOSITOL 3-KINASE; TRANSGENIC TOBACCO; PLANT-CELLS; EXPRESSION; PRECURSOR; DYNAMIN; GENE AB Vacuolar matrix proteins in plant cells are sorted from the secretory pathway to the vacuoles at the Golgi apparatus. Previously, we reported that the NH2-terminal propeptide (NTPP) of the sporamin precursor and the COOH-terminal propeptide (CTPP) of the barley lectin precursor contain information for vacuolar sorting. To analyze whether these propeptides are interchangeable, we expressed constructs consisting of wild-type or mutated NTPP with the mature part of barley lectin and sporamin with CTPP and mutated NTPP in tobacco BY-2 cells. The vacuolar localization of these constructs indicated that the signals were interchangeable. We next analyzed the effect of wortmannin, a specific inhibitor of mammalian phosphatidylinositol (PI) 3-kinase on vacuolar delivery by NTPP and CTPP in tobacco cells. Pulse-chase analysis indicated that 33 mu M wortmannin caused almost complete inhibition of CTPP-mediated transport to the vacuoles, while NTPP-mediated transport displayed almost no sensitivity to wortmannin at this concentration. This indicates that there are at least two different mechanisms for vacuolar sorting in tobacco cells, and the CTPP-mediated pathway is sensitive to wortmannin. We compared the dose dependencies of wortmannin on the inhibition of CTPP-mediated vacuolar delivery of proteins and on the inhibition of the synthesis of phospholipids in tobacco cells. Wortmannin inhibited PI 3- and PI 4-kinase activities and phospholipid synthesis. Missorting caused by wortmannin displays a dose dependency that is similar to the dose dependency for the inhibition of synthesis of PI 4-phosphate and major phospholipids. This is different, however, than the inhibition of synthesis of PI 3-phosphate. Thus, the synthesis of phospholipids could be involved in CTPP-mediated vacuolar transport. C1 MICHIGAN STATE UNIV,DOE,PLANT RES LAB,E LANSING,MI 48824. RP MATSUOKA, K (reprint author), NAGOYA UNIV,SCH AGR SCI,BIOCHEM LAB,CHIKUSA KU,NAGOYA,AICHI 46401,JAPAN. RI Matsuoka, Ken/E-3215-2010 NR 58 TC 195 Z9 198 U1 1 U2 5 PU ROCKEFELLER UNIV PRESS PI NEW YORK PA 222 E 70TH STREET, NEW YORK, NY 10021 SN 0021-9525 J9 J CELL BIOL JI J. Cell Biol. PD SEP PY 1995 VL 130 IS 6 BP 1307 EP 1318 DI 10.1083/jcb.130.6.1307 PG 12 WC Cell Biology SC Cell Biology GA RU812 UT WOS:A1995RU81200007 PM 7559754 ER PT J AU COGDELL, CD WAYMENT, DG CASADONTE, DJ KUBATMARTIN, KA AF COGDELL, CD WAYMENT, DG CASADONTE, DJ KUBATMARTIN, KA TI A CONVENIENT, ONE-STEP SYNTHESIS OF YBA2CU3O7-X SUPERCONDUCTORS - AN UNDERGRADUATE INORGANIC MATERIALS LABORATORY EXPERIMENT LABORATORY EXPERIMENT SO JOURNAL OF CHEMICAL EDUCATION LA English DT Article C1 TEXAS TECH UNIV,LUBBOCK,TX 79409. LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. NR 9 TC 4 Z9 4 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0021-9584 J9 J CHEM EDUC JI J. Chem. Educ. PD SEP PY 1995 VL 72 IS 9 BP 840 EP 841 PG 2 WC Chemistry, Multidisciplinary; Education, Scientific Disciplines SC Chemistry; Education & Educational Research GA TF091 UT WOS:A1995TF09100028 ER PT J AU MESSINA, M SCHENTER, GK GARRETT, BC AF MESSINA, M SCHENTER, GK GARRETT, BC TI A VARIATIONAL CENTROID DENSITY PROCEDURE FOR THE CALCULATION OF TRANSMISSION COEFFICIENTS FOR ASYMMETRIC BARRIERS AT LOW-TEMPERATURE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID TRANSITION-STATE THEORY; MODEL ACTIVATED REACTION; PATH INTEGRAL METHODS; RATE CONSTANTS; OPTIMIZATION; MECHANICS; DYNAMICS; SYSTEMS AB The low temperature behavior of the centroid density method of Voth, Chandler, and Miller (VCM) [J. Chem. Phys. 91, 7749 (1989)] is investigated for tunneling through a one-dimensional barrier. We find that the bottleneck for a quantum activated process as defined by VCM does not correspond to the classical bottleneck for the case of an asymmetric barrier. If the centroid density is constrained to be at the classical bottleneck for an asymmetric barrier,the centroid density method can give transmission coefficients that are too large by as much as five orders of magnitude. We follow a variational procedure, as suggested by VCM, whereby the best transmission coefficient is found by varying the position of the centroid until the minimum value for this transmission coefficient is obtained. This is a procedure that is readily generalizable to multidimensional systems. We present calculations on several test systems which show that this variational procedure greatly enhances the accuracy of the centroid density method compared to when the centroid is constrained to be at the barrier top. Furthermore, the relation of this procedure to the low temperature periodic orbit or ''instanton'' approach is discussed. (C) 1995 American Institute of Physics. C1 PACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, RICHLAND, WA 99352 USA. RI Garrett, Bruce/F-8516-2011; Schenter, Gregory/I-7655-2014 OI Schenter, Gregory/0000-0001-5444-5484 NR 36 TC 25 Z9 27 U1 1 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 1 PY 1995 VL 103 IS 9 BP 3430 EP 3435 DI 10.1063/1.470227 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RT923 UT WOS:A1995RT92300017 ER PT J AU GLENDENING, ED FELLER, D PETERSON, KA MCCULLOUGH, EA MILLER, RJ AF GLENDENING, ED FELLER, D PETERSON, KA MCCULLOUGH, EA MILLER, RJ TI THE DIPOLE-MOMENT AND MAGNETIC HYPERFINE PROPERTIES OF THE EXCITED A(2)SIGMA(+)(3S-SIGMA) RYDBERG STATE OF NITRIC-OXIDE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CONFIGURATION-INTERACTION CALCULATIONS; WAVE-FUNCTIONS; FINE-STRUCTURE; BASIS-SETS; SCF METHOD; NO; PARAMETERS; SPECTROSCOPY; SPECTRUM; N-14O-16 AB The dipole moment and magnetic hyperfine properties of the A (2) Sigma(+) Rydberg state of nitric oxide have been evaluated at a variety of levels of theory with extended correlation consistent basis sets. Using the finite field approach to compute the dipole moment, restricted coupled cluster RCCSD(T) and complete active space-configuration interaction CAS-CI+Q methods yield values (1.09-1.12 D) that are essentially identical to experiment. In contrast, dipole moments computed as an expectation value of the dipole moment operator typically differ from experiment by 0.1-0.6 D. The rather unfavorable comparisons with experiment reported in previous theoretical studies may stem, in part, from the method chosen to evaluate the dipole moment. Magnetic hyperfine properties were evaluated using a variety of unrestricted and restricted open-shell Martree-Fock-based methods. We estimated the full CI limiting properties by exploiting the convergence behavior of a sequence of MRCI wave functions. The isotropic component A(iso)(N-14) of 39+/-1 MHz evaluated in this fashion is in excellent accord with the experimental value of 41.4+/-1.7 MHz. Highly correlated UHF-based methods [e.g., CCSD(T) and QCISD(T)] yield comparable values of 40-41 MHz that are in good agreement with both experiment and the apparent full CI limit. However, for A(iso)(O-17), the full CI limit (-97+/-2 MHz) and the UHF-based results (ca.-118 MHz) differ by roughly 20 MHz. It remains unclear how to reconcile this large discrepancy. (C) 1995 American Institute of Physics. C1 WASHINGTON STATE UNIV, DEPT CHEM, RICHLAND, WA 99352 USA. UTAH STATE UNIV, DEPT CHEM & BIOCHEM, LOGAN, UT 84322 USA. RP GLENDENING, ED (reprint author), PACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, RICHLAND, WA 99352 USA. NR 42 TC 13 Z9 13 U1 2 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 1 PY 1995 VL 103 IS 9 BP 3517 EP 3525 DI 10.1063/1.470236 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RT923 UT WOS:A1995RT92300027 ER PT J AU FELLER, D GLENDENING, ED WOON, DE FEYEREISEN, MW AF FELLER, D GLENDENING, ED WOON, DE FEYEREISEN, MW TI AN EXTENDED BASIS-SET AB-INITIO STUDY OF ALKALI-METAL CATION-WATER CLUSTERS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID GAUSSIAN-BASIS SETS; CONFIGURATION-INTERACTION CALCULATIONS; CORRELATED MOLECULAR CALCULATIONS; WAVE-FUNCTIONS; GAS-PHASE; SUPERPOSITION ERROR; BENCHMARK CALCULATIONS; SYSTEMATIC SEQUENCES; DIATOMIC HYDRIDES; 1ST-ROW ELEMENTS AB Ionic clusters comprised of a single alkali metal cation and up to eight water molecules were studied at the Hartree-Fock and correlated levels of theory using the correlation consistent sequence of basis sets. Estimates of the degree of convergence in the computed properties with respect to the complete basis set limit were facilitated by the underlying systematic manner in which the correlation consistent sets approach completeness. In favorable cases, improved property values could be obtained by fitting finite basis set results with a simple analytical expression in order to extrapolate to the complete basis set limit. The sensitivity of structures and binding energies were analyzed with regard to the inclusion of valence and core-valence correlation recovery at the MP2, MP4, and CCSD(T) levels of theory. The replacement of metal core electrons and the introduction of relativistic contributions via effective core potentials was compared to corresponding all-electron results. (C) 1995 American Institute of Physics. C1 CRAY RES INC, EAGAN, MN 55121 USA. RP FELLER, D (reprint author), PACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, RICHLAND, WA 99352 USA. NR 76 TC 222 Z9 223 U1 1 U2 16 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 1 PY 1995 VL 103 IS 9 BP 3526 EP 3542 DI 10.1063/1.470237 PG 17 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RT923 UT WOS:A1995RT92300028 ER PT J AU KANG, HS REE, FH AF KANG, HS REE, FH TI NEW INTEGRAL-EQUATION FOR SIMPLE FLUIDS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID HARD-SPHERE MIXTURES; REPULSIVE FORCES; SIMPLE LIQUIDS; STATE; APPROXIMATION; TEMPERATURE; CONSISTENT; POTENTIALS; SYSTEM; RANGE AB We present a new integral equation for the radial distribution function of classical fluids. It employs the bridge function for a short-range repulsive reference system which was used earlier in our dense fluid perturbation theory. The bridge function is evaluated using Ballone et al.'s closure relation. Applications of the integral equation to the Lennard-Jones and inverse nth-power (n=12, 9, 6, and 4) repulsive systems show that it can predict thermodynamic and structural properties in close agreement with results from computer simulations and the reference-hypernetted-chain equation. We also discuss thermodynamic consistency tests on the new equation and comparisons with the integral equations of Rogers and Young and of Zerah and Hansen. The present equation has no parameter to adjust. This unique feature offers a significant advantage as it eliminates a time-consuming search to optimize such parameters appearing in other theories. It permits practical applications needing complex intermolecular potentials and for multicomponent systems. (C) 1995 American Institute of Physics. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94551 USA. RP JEONJU UNIV, COLL SCI & ENGN, DEPT CHEM, CHONJU 560759, SOUTH KOREA. NR 42 TC 21 Z9 21 U1 0 U2 3 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-9606 EI 1089-7690 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 1 PY 1995 VL 103 IS 9 BP 3629 EP 3635 DI 10.1063/1.470688 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RT923 UT WOS:A1995RT92300037 ER PT J AU BARCLAY, VJ DATEO, CE HAMILTON, IP KENDRICK, B PACK, RT SCHWENKE, DW AF BARCLAY, VJ DATEO, CE HAMILTON, IP KENDRICK, B PACK, RT SCHWENKE, DW TI ANOMALOUS SYMMETRIES OF THE ROVIBRATIONAL STATES OF HO2 - CONSEQUENCES OF A CONICAL INTERSECTION SO JOURNAL OF CHEMICAL PHYSICS LA English DT Note ID POTENTIAL-ENERGY SURFACE; THEORETICAL CHARACTERIZATION; GEOMETRIC PHASE AB We show that the geometric phase arising from a conical intersection of the lowest potential energy surfaces of HO2 causes its bending vibrational wave functions to be double-valued, which enables them to be locally symmetric on one side of the intersection and locally antisymmetric on the other. (C) 1995 American institute of Physics. C1 LOS ALAMOS NATL LAB, DIV THEORET T12 MS B268, LOS ALAMOS, NM 87545 USA. RI schwenke, david/I-3564-2013 NR 28 TC 26 Z9 26 U1 0 U2 9 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-9606 EI 1089-7690 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 1 PY 1995 VL 103 IS 9 BP 3864 EP 3867 DI 10.1063/1.470039 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RT923 UT WOS:A1995RT92300064 ER PT J AU FRANCONE, OL GONG, EL NG, DS FIELDING, CJ RUBIN, EM AF FRANCONE, OL GONG, EL NG, DS FIELDING, CJ RUBIN, EM TI EXPRESSION OF HUMAN LECITHIN-CHOLESTEROL ACYLTRANSFERASE IN TRANSGENIC MICE - EFFECT OF HUMAN APOLIPOPROTEIN AI AND HUMAN APOLIPOPROTEIN AII ON PLASMA-LIPOPROTEIN CHOLESTEROL-METABOLISM SO JOURNAL OF CLINICAL INVESTIGATION LA English DT Article DE HIGH DENSITY LIPOPROTEINS; REVERSE CHOLESTEROL TRANSPORT; CHOLESTEROL METABOLISM; APOLIPOPROTEINS; TRANSGENIC ANIMALS ID HIGH-DENSITY-LIPOPROTEIN; CELL-DERIVED CHOLESTEROL; ESTER TRANSFER PROTEIN; IMMUNOAFFINITY CHROMATOGRAPHY; MESSENGER-RNA; PARTICLES; GENE; ELECTROPHORESIS; SUBCLASSES; LIVER AB Human (Hu) lecithin-cholesterol acyltransferase (LCAT) is a key enzyme in the plasma metabolism of cholesterol. To assess the effects of increased plasma levels of LCAT, four lines of transgenic mice were created expressing a Hu LCAT gene driven by either its natural or the mouse albumin enhancer promoter. Plasma LCAT activity increased from 1.2- to 1.6-fold higher than that found in control mouse plasma. Lipid profiles, upon comparing HuLCAT transgenics to control animals, revealed a 20 to 60% increase in total and cholesteryl esters that were mainly present in HDL. The in vivo substrate specificity of Hu LCAT was assessed by creating animals expressing Hu apo AI + Hu LCAT (HuAI/LCAT), Hu apo AI + Hu apo AII + Hu LCAT (HuAI/AII/LCAT), and Hu apo AII + Hu LCAT (HuAII/LCAT). Plasma cholesterol was increased up to 4,2-fold in HuAI/LCAT LCAT transgenic mice and two fold in the HuAI/AII/LCAT transgenic mice, compared with HuAI and HuAI/AII transgenic mice, HDL cholesteryl ester levels were increased more than twofold in both the HuAI/LCAT and HuAI/AII/LCAT mice compared with the HuAI, HuAI/AII, and HuLCAT animals. The HDL particles were predominantly larger in the HuAI/LCAT and the HuAI/AII/LCAT mice compared with those in HuAI, HuAII/LCAT, and HuLCAT animals. The increase in LCAT activity in the HuAI/LCAT and HuAI/AII/LCAT mice was associated with 62 and 27% reductions respectively, in the proportion of Hu apo AI in the pre beta-HDL fraction, when compared with HuAI and HuAI/AII transgenic mice. These data demonstrate that moderate increases in LCAT activity are associated with significant changes in lipoprotein cholesterol levels and that Hu LCAT has a significant preference for HDL containing Hu apo AI. C1 UNIV CALIF SAN FRANCISCO,MED CTR,CARDIOVASC RES INST,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,MED CTR,DEPT PHYSIOL,SAN FRANCISCO,CA 94143. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. FU NHLBI NIH HHS [SCOR HL 14237, HL18574] NR 48 TC 77 Z9 77 U1 0 U2 1 PU ROCKEFELLER UNIV PRESS PI NEW YORK PA 222 E 70TH STREET, NEW YORK, NY 10021 SN 0021-9738 J9 J CLIN INVEST JI J. Clin. Invest. PD SEP PY 1995 VL 96 IS 3 BP 1440 EP 1448 DI 10.1172/JCI118180 PG 9 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA RR853 UT WOS:A1995RR85300033 PM 7657816 ER PT J AU CALLOW, MJ VERSTUYFT, J TANGIRALA, R PALINSKI, W RUBIN, EM AF CALLOW, MJ VERSTUYFT, J TANGIRALA, R PALINSKI, W RUBIN, EM TI ATHEROGENESIS IN TRANSGENIC MICE WITH HUMAN APOLIPOPROTEIN-B AND LIPOPROTEIN (A) SO JOURNAL OF CLINICAL INVESTIGATION LA English DT Note DE ATHEROSCLEROSIS; LDL; LP(A); MOUSE; TRANSGENE ID LOW-DENSITY-LIPOPROTEIN; EXPRESSING HUMAN APOLIPOPROTEIN(A); ATHEROSCLEROTIC LESIONS; A-I; PLASMA; HYPERCHOLESTEROLEMIA; CHOLESTEROL; APO-B-100; BINDING; CELLS AB The engineering of mice that express a human apoB transgene has resulted in animals with high levels of humanlike LDL particles and through crosses with human apo(a) transgenics, high levels of human-like lipoprotein (a) (Lp[a]) particles, In this study, these animals have been used to compare the atherogenic properties of apo(a), LDL, and Lp(a), The presence of the high expressing apoB (apoBH) transgene was associated with a 2.5-fold increase in VLDL-LDL cholesterol (primarily in the LDL fraction) and a 15-fold increase in proximal lesions compared with non-transgenic mice (P less than or equal to 0.0001), while the presence of the low expressing human apoB (apoBL) transgene was not associated with major changes in lipoprotein profiles or increases in aortic lesion size, Examination of aortas of apoBH mice demonstrated lesions along the entire length of the aorta and immunochemical analysis of the lesions revealed features characteristically seen in human lesions including the presence of oxidized lipoproteins, macrophages, and immunoglobulins. Unlike animals with the apoBL transgene, animals with the apo(a) transgene had significant increases in proximal aortic fatty streak lesions compared to nontransgenic control animals (threefold; P < 0.02), while animals with both transgenes, the apo(a)/apoBL double transgenics, had lesions 2.5 times greater than animals expressing the apo(a) transgene alone and eightfold (P < 0.0006) greater than nontransgenic animals, These murine studies demonstrate that marked increases in apoB and LDL resulted in atherosclerotic lesions extending down the aorta which resemble human lesions immunochemically and suggest that apo(a) associated with apoB and lipid may result in a more pro-atherogenic state than when apo(a) is free in plasma. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR HUMAN GENOME,BERKELEY,CA 94720. UNIV CALIF SAN DIEGO,DEPT MED,LA JOLLA,CA 92093. FU NHLBI NIH HHS [HL-14197, HL-18574] NR 39 TC 76 Z9 77 U1 0 U2 0 PU ROCKEFELLER UNIV PRESS PI NEW YORK PA 222 E 70TH STREET, NEW YORK, NY 10021 SN 0021-9738 J9 J CLIN INVEST JI J. Clin. Invest. PD SEP PY 1995 VL 96 IS 3 BP 1639 EP 1646 DI 10.1172/JCI118203 PG 8 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA RR853 UT WOS:A1995RR85300056 PM 7657833 ER PT J AU GEORGE, JS AINE, CJ MOSHER, JC SCHMIDT, DM RANKEN, DM SCHLITT, HA WOOD, CC LEWINE, JD SANDERS, JA BELLIVEAU, JW AF GEORGE, JS AINE, CJ MOSHER, JC SCHMIDT, DM RANKEN, DM SCHLITT, HA WOOD, CC LEWINE, JD SANDERS, JA BELLIVEAU, JW TI MAPPING FUNCTION IN THE HUMAN BRAIN WITH MAGNETOENCEPHALOGRAPHY, ANATOMICAL MAGNETIC-RESONANCE-IMAGING, AND FUNCTIONAL MAGNETIC-RESONANCE-IMAGING SO JOURNAL OF CLINICAL NEUROPHYSIOLOGY LA English DT Review DE BRAIN MAPPING; MAGNETOENCEPHALOGRAPHY; FUNCTIONAL MAGNETIC RESONANCE IMAGING; ANATOMICAL CONSTRAINTS; MULTIMODALITY IMAGING ID BIOMAGNETIC INVERSE PROBLEM; HUMAN VISUAL-CORTEX; EVOKED-POTENTIALS; SENSORY STIMULATION; NEURONAL-ACTIVITY; LOCALIZATION; DIPOLE; MODEL; HEAD; IDENTIFICATION AB Integrated analyses of human anatomical and functional measurements offer a powerful paradigm for human brain mapping, Magnetoencephalography (MEG) and EEG provide excellent temporal resolution of neural population dynamics as well as capabilities for source localization. Anatomical magnetic resonance imaging (MRI) provides excellent spatial resolution of head and brain anatomy, whereas functional MRI (fMRI) techniques provide an alternative measure of neural activation based on associated hemodynamic changes. These methodologies constrain and complement each other and can thereby improve our interpretation of functional neural organization. We have developed a number of computational tools and techniques for the visualization, comparison, and integrated analysis of multiple neuroimaging techniques. Construction of geometric anatomical models from volumetric MRI data allows improved models of the head volume conductor and can provide powerful constraints for neural electromagnetic source modeling. These approaches, coupled to enhanced algorithmic strategies for the inverse problem, can significantly enhance the accuracy of source-localization procedures. We have begun to apply these techniques for studies of the functional organization of the human visual system. Such studies have demonstrated multiple, functionally distinct visual areas that can be resolved on the basis of their locations, temporal dynamics, and differential sensitivity to stimulus parameters. Our studies have also produced evidence of internal retinotopic organization in both striate and extrastriate visual areas but have disclosed organizational departures from classical models. Comparative studies of MEG and fMRI suggest a reasonable but imperfect correlation between electrophysiological and hemodynamic responses. We have demonstrated a method for the integrated analysis of fMRI and MEG, and we outline strategies for improvement of these methods. By combining multiple measurement techniques, we can exploit the complementary strengths and transcend the limitations of the individual neuroimaging methods. C1 ALBUQUERQUE FED REG MED CTR,CTR MAGNET RESONANCE IMAGING,ALBUQUERQUE,NM. MASSACHUSETTS GEN HOSP,CTR NMR,BOSTON,MA. ALBUQUERQUE FED REG MED CTR,CTR MAGNET SOURCE IMAGING,ALBUQUERQUE,NM. RP GEORGE, JS (reprint author), LOS ALAMOS NATL LAB,BIOPHYS GRP,MS M-715,LOS ALAMOS,NM 87545, USA. FU NEI NIH HHS [EY08610] NR 92 TC 152 Z9 155 U1 2 U2 15 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0736-0258 J9 J CLIN NEUROPHYSIOL JI J. Clin. Neurophysiol. PD SEP PY 1995 VL 12 IS 5 BP 406 EP 431 DI 10.1097/00004691-199509010-00002 PG 26 WC Clinical Neurology; Neurosciences SC Neurosciences & Neurology GA RW073 UT WOS:A1995RW07300002 PM 8576388 ER PT J AU GU, M AF GU, M TI FINDING WELL-CONDITIONED SIMILARITIES TO BLOCK-DIAGONALIZE NONSYMMETRIC MATRICES IS NP-HARD SO JOURNAL OF COMPLEXITY LA English DT Article AB Given an upper triangular matrix A is an element of R(nxn) and a tolerance tau, we show that the problem of finding a similarity transformation G such that G(-1) A G is block diagonal with the condition number of G being at most tau is NP-hard. Let f(n) be a polynomial in n. We also show that the problem of finding a similarity transformation G such that G(-1) A G is block-diagonal with the condition number of G being at most f(n) times larger than the smallest possible is NP-hard. (C) 1995 Academic Press, Inc. C1 UNIV CALIF BERKELEY,DEPT MATH,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RI Gu, Min/B-6627-2008 NR 16 TC 10 Z9 10 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0885-064X J9 J COMPLEXITY JI J. Complex. PD SEP PY 1995 VL 11 IS 3 BP 377 EP 391 DI 10.1006/jcom.1995.1019 PG 15 WC Computer Science, Theory & Methods; Mathematics, Applied SC Computer Science; Mathematics GA RW377 UT WOS:A1995RW37700007 ER PT J AU GIBBONS, MR HEWETT, DW AF GIBBONS, MR HEWETT, DW TI THE DARWIN DIRECT IMPLICIT PARTICLE-IN-CELL (DADIPIC) METHOD FOR SIMULATION OF LOW-FREQUENCY PLASMA PHENOMENA SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article AB We describe a new algorithm for simulating low frequency, kinetic phenomena in plasmas. Darwin direct implicit particle-in-cell (DADIPIC), as its name implies, is a combination of the Darwin and direct implicit methods. Through the Darwin method the hyperbolic Maxwell's equations are reformulated into a set of elliptic equations. Propagating light waves do not exist in the formulation so the Courant constraint on the time step is eliminated, The direct implicit method is applied only to the electrostatic field with the result that electrostatic plasma oscillations do not have to be resolved for stability. With the elimination of these constraints spatial and temporal discretization can be much larger than that possible with explicit, electrodynamic PIC. We discuss the algorithms for pushing the particles and solving for the fields in 2D cartesian geometry. We also detail boundary conditions for conductors and dielectrics. Finally, we present two test cases, electron cyclotron waves and collisionless heating in inductively coupled plasmas, For these test cases DADIPIC shows agreement with analytic kinetic theory and good energy conservation characteristics. (C) 1995 Academic Press. Inc. RP GIBBONS, MR (reprint author), LAWRENCE LIVERMORE NATL LAB,PLASMA PHYS RES INST,LIVERMORE,CA 94550, USA. NR 32 TC 30 Z9 30 U1 0 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD SEP PY 1995 VL 120 IS 2 BP 231 EP 247 DI 10.1006/jcph.1995.1160 PG 17 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA RQ709 UT WOS:A1995RQ70900005 ER PT J AU PEMBER, RB BELL, JB COLELLA, P CRUTCHFIELD, WY WELCOME, ML AF PEMBER, RB BELL, JB COLELLA, P CRUTCHFIELD, WY WELCOME, ML TI AN ADAPTIVE CARTESIAN GRID METHOD FOR UNSTEADY COMPRESSIBLE FLOW IN IRREGULAR REGIONS SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID HYPERBOLIC CONSERVATION-LAWS; ORDER GODUNOV METHODS; DIFFERENCE-SCHEMES; EULER EQUATIONS; STRONG SHOCKS; SYSTEMS; FLUX AB In this paper we describe an adaptive Cartesian grid method for modeling time-dependent inviscid compressible flow in irregular regions. In th is approach a body is treated as an interface em bedded in a regular Cartesian mesh. The single grid algorithm uses an unsplit second-order Godunov algorithm followed by a corrector applied to cells at the boundary. The discretization near the fluid-body interface is based on a volume-of-fluid approach with a redistribution procedure to maintain conservation while avoiding lime step restrictions arising from small cells where the boundary intersects the mesh. The single grid Cartesian mesh integration scheme is coupled to a conservative adaptive mesh refinement algorithm that selectively refines regions of the computational grid to achieve a desired level of accuracy. Examples showing the results of the combined Cartesian grid integration/adaptive mesh refinement algorithm for both two- and three-dimensional flows are presented. (C) 1995 Academic Press, Inc. C1 UNIV CALIF BERKELEY, DEPT MECH ENGN, BERKELEY, CA 94720 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP LAWRENCE LIVERMORE NATL LAB, POB 808, L-316, LIVERMORE, CA 94550 USA. NR 71 TC 157 Z9 162 U1 0 U2 7 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0021-9991 EI 1090-2716 J9 J COMPUT PHYS JI J. Comput. Phys. PD SEP PY 1995 VL 120 IS 2 BP 278 EP 304 DI 10.1006/jcph.1995.1165 PG 27 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA RQ709 UT WOS:A1995RQ70900010 ER PT J AU STURMAN, PJ STEWART, PS CUNNINGHAM, AB BOUWER, EJ WOLFRAM, JH AF STURMAN, PJ STEWART, PS CUNNINGHAM, AB BOUWER, EJ WOLFRAM, JH TI ENGINEERING SCALE-UP OF IN-SITU BIOREMEDIATION PROCESSES - A REVIEW SO JOURNAL OF CONTAMINANT HYDROLOGY LA English DT Review ID BIODEGRADABLE ORGANIC CONTAMINANTS; COMPOSITIONAL MULTIPHASE MODEL; NATURAL MICROBIAL COMMUNITIES; OXYGEN-LIMITED BIODEGRADATION; HAZARDOUS-WASTE SITE; POROUS-MEDIA; AEROBIC BIODEGRADATION; PETROLEUM-HYDROCARBONS; SOLUTE TRANSPORT; SANDSTONE CORES AB To be useful to field practitioners, advances in bioremediation research must be capable of being scaled up from the laboratory to the field. The phenomena which control the rate at which biodegradation proceeds are typically scale-dependent in nature. Failure to understand and account for scale-dependent variables, such as mass transport limitations, spatial heterogeneities and the presence of competing microorganisms, may inhibit the effectiveness of field-scale bioremediation designs. This paper reviews and evaluates the methods available for characterization of the processes effecting bioremediation at scales ranging from the laboratory to the field. Questions facing the field-scale practitioner of bioremediation are addressed in a manner which highlights the current state of research, the reliability of results and the extent to which laboratory-scale research accurately reflects common field conditions. Where gaps or inadequacies exist in our current knowledge or methods, research needs are identified. This review is intended to complement existing work by providing a framework from which to assess the importance of scale of observation to a particular result or conclusion, thereby providing an integrated approach to the scale-up process. C1 MONTANA STATE UNIV,DEPT CHEM ENGN,BOZEMAN,MT 59717. MONTANA STATE UNIV,DEPT CIVIL ENGN,BOZEMAN,MT 59717. JOHNS HOPKINS UNIV,DEPT GEOG & ENVIRONM ENGN,BALTIMORE,MD 21218. IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415. RP STURMAN, PJ (reprint author), MONTANA STATE UNIV,CTR BIOFILM ENGN,BOZEMAN,MT 59717, USA. NR 146 TC 74 Z9 75 U1 2 U2 20 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-7722 J9 J CONTAM HYDROL JI J. Contam. Hydrol. PD SEP PY 1995 VL 19 IS 3 BP 171 EP 203 DI 10.1016/0169-7722(95)00017-P PG 33 WC Environmental Sciences; Geosciences, Multidisciplinary; Water Resources SC Environmental Sciences & Ecology; Geology; Water Resources GA RL766 UT WOS:A1995RL76600001 ER PT J AU Chambers, RS Lagasse, RR Guess, TR Plazek, DJ Bero, C AF Chambers, RS Lagasse, RR Guess, TR Plazek, DJ Bero, C TI A rubbery cure shrinkage model for analyzing encapsulated assemblies SO JOURNAL OF ELECTRONIC PACKAGING LA English DT Article ID EPOXY-RESINS; STRESSES AB Electrical component assemblies are encapsulated to provide delicate parts with voltage isolation and protection against damage. The stresses generated by cure shrinkage, although typically smaller than the thermal residual stresses produced by cooling, can cause delamination or fractures in an encapsulant. Mechanical failures call be reduced by optimizing the encapsulation process or altering the component geometry. This paper documents the performance of rubbery constitutive equations in analyzing the stresses and strains generated by isothermal curing. A rubbery cure shrinkage model was installed in a finite element program and material inputs were obtained by measuring the rubbery shear modulus and volumetric shrinkage of a gelled epoxy during isothermal curing at several temperatures. A test was performed to measure the structural response produced by curing, and the data were compared to finite element predictions. The rubbery model performs well when the glass transition temperature of the curing epoxy does not exceed the cure temperature. C1 UNIV PITTSBURGH,DEPT MAT SCI & ENGN,PITTSBURGH,PA 15261. RP Chambers, RS (reprint author), SANDIA NATL LABS,MS 0443,ALBUQUERQUE,NM 87185, USA. NR 6 TC 6 Z9 6 U1 0 U2 4 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 1043-7398 J9 J ELECTRON PACKAGING JI J. Electron. Packag. PD SEP PY 1995 VL 117 IS 3 BP 249 EP 254 DI 10.1115/1.2792101 PG 6 WC Engineering, Electrical & Electronic; Engineering, Mechanical SC Engineering GA TT215 UT WOS:A1995TT21500015 ER PT J AU ZHU, S CAL, Y CHEN, SS AF ZHU, S CAL, Y CHEN, SS TI EXPERIMENTAL FLUID-FORCE COEFFICIENTS FOR WAKE-INDUCED CYLINDER VIBRATION SO JOURNAL OF ENGINEERING MECHANICS LA English DT Article ID INTERFERING CIRCULAR-CYLINDERS; CROSS-FLOW; PAIR AB A mathematical model based on the unsteady-flow theory is presented for wake-induced vibration of an elastic circular cylinder in the wake of another circular cylinder. Motion-dependent fluid forces were measured for six cylinder arrangements. From measured fluid forces, fluid-damping and stiffness coefficients. were calculated as a function of reduced flow velocity and oscillation amplitude. Once the fluid-force coefficients are known, the stability of an elastic cylinder in the wake of a stationary cylinder can be analyzed. The characteristics of dynamic instability were calculated for both coupled and uncoupled models. Results show that the unsteady-flow theory is a simple and useful model that can be applied to predict cylinder response. The model presented, based on the unsteady-flow theory and direct measurement technique, provides an adequate characterization of the fluid effects for a cylinder in the wake of another one. RP ARGONNE NATL LAB, DIV ENERGY TECHNOL, 9700 S CASS AVE, ARGONNE, IL 60439 USA. NR 25 TC 10 Z9 10 U1 1 U2 1 PU ASCE-AMER SOC CIVIL ENGINEERS PI RESTON PA 1801 ALEXANDER BELL DR, RESTON, VA 20191-4400 USA SN 0733-9399 EI 1943-7889 J9 J ENG MECH JI J. Eng. Mech. PD SEP PY 1995 VL 121 IS 9 BP 1003 EP 1015 DI 10.1061/(ASCE)0733-9399(1995)121:9(1003) PG 13 WC Engineering, Mechanical SC Engineering GA RQ546 UT WOS:A1995RQ54600009 ER PT J AU GATES, DD SIEGRIST, RL AF GATES, DD SIEGRIST, RL TI IN-SITU CHEMICAL OXIDATION OF TRICHLOROETHYLENE USING HYDROGEN-PEROXIDE SO JOURNAL OF ENVIRONMENTAL ENGINEERING-ASCE LA English DT Article ID FENTONS REAGENT AB Laboratory studies were conducted to determine the feasibility of injecting and mixing hydrogen peroxide (H2O2) solutions into clay soils contaminated with trichloroethylene (TCE) to achieve in-situ chemical oxidation. Bench-scale slurry studies were conducted first using 0.3 L slurry reactors and TCE concentrations in the 1.9 to 34 mg/kg range. TCE reductions as high as 98% of the initial concentration were achieved with a H2O2 dose of 28 g H2O2/kg soil. TCE degradation increased with increasing hydrogen peroxide strength and appeared independent of the initial TCE concentration. Column studies were conducted with an apparatus fabricated to simulate in-situ mixing and chemical oxidant injection. Stainless steel columns 20 cm in diameter and 23 cm long, which were packed with clay soil, were mixed with an auger blade while H2O2 solutions were injected through orifices at the back of the mixing blade. The H2O2 doses for the column studies were 1.2 and 2.5 g H2O2/kg soil, based on an injection concentration of 5% weight H2O2 at volumetric additions of 5% and 10% of the soil volume treated. TCE reductions of 88% and 75% were achieved at the two dosing rates. Based on the results of these laboratory studies, in-situ chemical oxidation of contaminated soils appears to be a viable soil remediation technique that is dependent on the efficient delivery and distribution of H2O2 throughout the region to be treated. RP GATES, DD (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. NR 26 TC 93 Z9 102 U1 3 U2 12 PU ASCE-AMER SOC CIVIL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2398 SN 0733-9372 J9 J ENVIRON ENG-ASCE JI J. Environ. Eng.-ASCE PD SEP PY 1995 VL 121 IS 9 BP 639 EP 644 DI 10.1061/(ASCE)0733-9372(1995)121:9(639) PG 6 WC Engineering, Environmental; Engineering, Civil; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA RQ388 UT WOS:A1995RQ38800007 ER PT J AU RIZZO, R GRANDOLFO, M GODEAS, C JONES, KW VITTUR, F AF RIZZO, R GRANDOLFO, M GODEAS, C JONES, KW VITTUR, F TI CALCIUM, SULFUR, AND ZINC DISTRIBUTION IN NORMAL AND ARTHRITIC ARTICULAR EQUINE CARTILAGE - A SYNCHROTRON-RADIATION-INDUCED X-RAY-EMISSION (SRIXE) STUDY SO JOURNAL OF EXPERIMENTAL ZOOLOGY LA English DT Note ID OSTEOARTHRITIS AB Calcium, sulfur, and zinc content in normal and arthritic equine cartilage have been studied by synchrotron radiation-induced X-ray emission (SRIXE). Ranging from the superficial to the columnar zone of the normal tissue, calcium and zinc concentrations are increasingly higher, whereas sulfur is at its highest concentration in the transitional zone. In the arthritic tissue, calcium concentration is at its maximum in the transitional zone, whereas zinc and sulfur distributions are relatively homogeneous. Sulfur concentration in arthritic cartilage is reduced to about one-third with respect to that in normal tissue. The possibility that zinc concentration reflects the distribution of the zinc-containing enzyme alkaline phosphatase is presented. (C) 1995 Wiley-Liss, Inc. C1 UNIV TRIESTE,BCM,DIPARTMENTO BIOCHIM,I-34127 TRIESTE,ITALY. BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 14 TC 19 Z9 20 U1 0 U2 1 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0022-104X J9 J EXP ZOOL JI J. Exp. Zool. PD SEP 1 PY 1995 VL 273 IS 1 BP 82 EP 86 DI 10.1002/jez.1402730111 PG 5 WC Zoology SC Zoology GA RX573 UT WOS:A1995RX57300010 PM 7561728 ER PT J AU Shekarriz, A Phillips, JR Weir, TD AF Shekarriz, A Phillips, JR Weir, TD TI Quantitative visualization of a submerged pseudoplastic jet using particle image velocimetry SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article AB A preliminary experimental study of a pseudoplastic jet flow is reported in this paper. The velocity field was measured using Particle Image Velocimetry. Unlike a Newtonian jet, the pseudoplastic jet was observed to experience a sudden drop in its velocity at a reproducible position downstream of the nozzle for the range of velocities examined. This position moved downstream with an increase in the nozzle exit velocity. The center-line streamwise velocity decayed as X(-15) to X(-30) within the terminating region of the jet for three different nozzle exit velocities of 2.43, 3.17, and 5.42 m/s. This decay is in contrast of X(-1) decay for a turbulent or laminar Newtonian jet. The location of the terminating region did not appear to scale with Reynolds number, Plasticity number, or Hedstrom number. At Reynolds number condition. Close observation of the jet indicated that local turbulence could exist within regions of high shear rate. Further detailed study is required to confirm this observation. RP Shekarriz, A (reprint author), PACIFIC NW LAB, FLUID DYNAM LAB, RICHLAND, WA 99352 USA. NR 16 TC 2 Z9 2 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0098-2202 J9 J FLUID ENG-T ASME JI J. Fluids Eng.-Trans. ASME PD SEP PY 1995 VL 117 IS 3 BP 369 EP 373 DI 10.1115/1.2817271 PG 5 WC Engineering, Mechanical SC Engineering GA TT084 UT WOS:A1995TT08400007 ER PT J AU VIGO, GP HUEBER, DM VODINH, T AF VIGO, GP HUEBER, DM VODINH, T TI EVALUATION OF DATA TREATMENT TECHNIQUES FOR IMPROVED ANALYSIS OF FINGERPRINT IMAGES SO JOURNAL OF FORENSIC SCIENCES LA English DT Article DE CRIMINALISTICS; FINGERPRINTS; DATA TREATMENT TECHNIQUES ID DECOMPOSITION; WAVELETS AB We evaluated four different methods for data treatment of fingerprint images. The first two methods (Lee's method, and Iterative Automated Noise Filtering method) are used to remove signal-independent additive noise from digital images of fingerprints. The two other methods (low-pass and high-pass wavelet filtering), based on the wavelet transform, are employed not only to reduce the noise, but also to enhance the information of the fingerprints, especially details at the ridges. To evaluate these four filtering techniques we analyzed images of various fingerprints provided by the Police Department of Knoxville, Tennessee, and recorded digitally in the laboratory using inexpensive apparatus. Experimental results show that the methods are effective in diverse cases and have potential in forensic analysis of fingerprints. C1 OAK RIDGE NATL LAB,HLT SCI RES DIV,ADV MONITORING DEV GRP,OAK RIDGE,TN 37831. NR 29 TC 4 Z9 4 U1 0 U2 0 PU AMER SOC TESTING MATERIALS PI W CONSHOHOCKEN PA 100 BARR HARBOR DR, W CONSHOHOCKEN, PA 19428-2959 SN 0022-1198 J9 J FORENSIC SCI JI J. Forensic Sci. PD SEP PY 1995 VL 40 IS 5 BP 826 EP 837 PG 12 WC Medicine, Legal SC Legal Medicine GA RX718 UT WOS:A1995RX71800027 ER PT J AU PALLER, MH TUCKFIELD, RC STARKEL, WM AF PALLER, MH TUCKFIELD, RC STARKEL, WM TI STATISTICAL-METHODS FOR DETECTING ICHTHYOPLANKTON DENSITY PATTERNS THAT INFLUENCE ENTRAINMENT MORTALITY SO JOURNAL OF FRESHWATER ECOLOGY LA English DT Article AB Samples of drifting American shad eggs were collected with 0.5 mm mesh nets at two transects in the Savannah River near industrial water intakes. At each transect the river was divided horizontally and vertically into four sectors that were sampled at two hour intervals for 24 hour periods to assess horizontal and vertical patterns of egg distribution that could affect vulnerability to entrainment. Egg densities varied by an average factor of 20 over a 24 hour cycle and were consistently highest between 2300 and 0300 and lowest between 1300 and 2000. We used two methods to separate spatial from temporal variance, analysis of covariance (ANCOVA) with a polynomial model for time of day as the covariate and a detrending technique in which diet variation was subtracted from each data point. These procedures resulted in substantially more sensitive tests of sector differences as indicated by minimum detectable ratios of sector means that were only half as great as for unadjusted data. Spatial patterns differed between transects but were generally consistent within transects where three to four-fold differences among sector means were common. The actual risk of entrainment was approximately 35-50% lower than if the shad eggs were uniformly distributed, and the risk of entrainment was lower at one intake than at the other. Our results indicate the importance of site specific assessments of ichthyoplankton distribution near existing or proposed water intakes using statistical designs that permit sensitive resolution of spatial patterns. C1 WESTINGHOUSE SAVANNAH RIVER CO,APPL TECHNOL SECT,AIKEN,SC 29808. DAMES & MOORE,ATLANTA,GA 30305. RP PALLER, MH (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,ENVIRONM SCI SECT,SAVANNAH RIVER SITE,AIKEN,SC 29808, USA. NR 10 TC 0 Z9 0 U1 0 U2 1 PU OIKOS PUBL INC PI LA CROSSE PA PO BOX 2558, LA CROSSE, WI 54601 SN 0270-5060 J9 J FRESHWATER ECOL JI J. Freshw. Ecol. PD SEP PY 1995 VL 10 IS 3 BP 231 EP 239 DI 10.1080/02705060.1995.9663443 PG 9 WC Ecology; Limnology SC Environmental Sciences & Ecology; Marine & Freshwater Biology GA RZ113 UT WOS:A1995RZ11300005 ER PT J AU FUSELIER, SA THOMSEN, MF IPAVICH, FM SCHMIDT, WKH AF FUSELIER, SA THOMSEN, MF IPAVICH, FM SCHMIDT, WKH TI SUPRATHERMAL HE2+ IN THE EARTHS FORESHOCK REGION SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID FIELD-ALIGNED BEAMS; SUPERCRITICAL COLLISIONLESS SHOCKS; UPSTREAM SOLAR-WIND; BOW SHOCK; ALPHA-PARTICLES; PARALLEL SHOCKS; IONS UPSTREAM; ACCELERATION; SIMULATIONS; INJECTION AB ISEE 1 and 2 H+ and He2+ observations upstream from the Earth's bow shock are used to investigate the origin of energetic (or diffuse) ion distributions. Diffuse ion distributions have energies from a few keV/e to >100 keV/e and have near solar wind concentrations (i.e., an average of about 4% He2+). These distributions may evolve from suprathermal ion distributions that have energies between 1 and a few keV/e. Upstream intervals were selected from the ISEE data to determine which suprathermal distributions have He2+ concentrations similar to those of diffuse ion distributions. The type of distribution and the location in the foreshock were similar in all events studied. Two intervals that represent the results from this study are discussed in detail. The results suggest that diffuse ion distributions evolve from suprathermal distributions in the region upstream from the quasi-parallel bow shock. For He2+, the suprathermal distribution is a nongyrotropic partial ring beam and has characteristics consistent with specular reflection off the quasi-parallel bow shock. The suprathermal proton distributions associated with these He2+ distributions are nongyrotropic partial ring beams or nearly gyrotropic ring beams also approximately consistent with specular reflection. The location in the quasi-parallel foreshock and the similarity of the suprathermal He2+ and H+ distributions suggest that these are the seed population for diffuse distributions in the foreshock region. C1 UNIV MARYLAND,DEPT PHYS & ASTRON,COLLEGE PK,MD 20742. MAX PLANCK INST AERON,D-37191 KATLENBURG DUHM,GERMANY. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP FUSELIER, SA (reprint author), LOCKHEED PALO ALTO RES LABS,3251 HANOVER ST,DEPT 91-20,BLDG 252,PALO ALTO,CA 94304, USA. NR 30 TC 19 Z9 19 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD SEP 1 PY 1995 VL 100 IS A9 BP 17107 EP 17116 DI 10.1029/95JA00898 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RT743 UT WOS:A1995RT74300011 ER PT J AU ORLOWSKI, DS RUSSELL, CT KRAUSSVARBAN, D OMIDI, N THOMSEN, MF AF ORLOWSKI, DS RUSSELL, CT KRAUSSVARBAN, D OMIDI, N THOMSEN, MF TI DAMPING AND SPECTRAL FORMATION OF UPSTREAM WHISTLERS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID EARTHS BOW SHOCK; PERPENDICULAR COLLISIONLESS SHOCKS; PROTON-BEAM GENERATION; LOWER HYBRID FREQUENCY; ONE-HERTZ WAVES; ISEE-2 OBSERVATIONS; POTENTIAL JUMP; ELECTRON-BEAMS; MACH NUMBER; MODE SHOCKS AB Previous studies have indicated that damping rates of upstream whistlers strongly depend on the details of the electron distribution function. Moreover, detailed analysis of Doppler shift and the whistler dispersion relation indicate that upstream whistlers propagate obliquely in a finite band of frequencies. In this paper we present results of a kinetic calculation of damping lengths of wideband whistlers using the sum of seven drifting bi-Maxwellian electron distributions as a best fit to the ISEE 1 electron data. For two cases, when upstream whistlers are observed, convective damping lengths derived from ISEE magnetic field and ephemeris data are compared with theoretical results. We find that the calculated convective damping lengths are consistent with the data and that upstream whistlers remain marginally stable. We also show that the slope of plasma frame spectra of upstream whistlers, obtained by direct fitting of the observed spectra, is between 5 and 7. The overall spectral, wave, and particle characteristics, proximity to the shock, as well as propagation and damping properties indicate that these waves cannot be generated locally. Instead, the observed upstream whistlers arise in the shock ramp, most likely by a variety of cross-field drift and/or anisotropy driven instabilities. C1 UNIV CALIF SAN DIEGO, DEPT ELECT & COMP ENGN, LA JOLLA, CA 92023 USA. UNIV CALIF SAN DIEGO, CALIF SPACE INST, LA JOLLA, CA 92023 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RP ORLOWSKI, DS (reprint author), UNIV CALIF LOS ANGELES, INST GEOPHYS & PLANETARY SCI, 405 HILGARD AVE, 6842 SLICHTER HALL, LOS ANGELES, CA 90095 USA. NR 57 TC 29 Z9 29 U1 1 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0148-0227 J9 J GEOPHYS RES-SPACE JI J. Geophys. Res-Space Phys. PD SEP 1 PY 1995 VL 100 IS A9 BP 17117 EP 17128 DI 10.1029/95JA00062 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RT743 UT WOS:A1995RT74300012 ER PT J AU MJOLHUS, E HANSSEN, A DUBOIS, DF AF MJOLHUS, E HANSSEN, A DUBOIS, DF TI RADIATION FROM ELECTROMAGNETICALLY DRIVEN LANGMUIR TURBULENCE SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID IONOSPHERIC HEATING EXPERIMENTS; ELECTRON-CYCLOTRON HARMONICS; PARAMETRIC-INSTABILITIES; MAGNETIZED PLASMA; EMISSION; WAVE; ARECIBO; RADAR; EXCITATION; DEPENDENCE AB A two-level model for the interaction between the electromagnetic pump wave and the electrostatic turbulence is formulated for ionospheric radio modification experiments. On the local level, the Zakharov equations, or similar models, apply. The interaction with the global electromagnetic level is represented by a second-order current density averaged over the local spatial variable. The energy exchange between the local and global level is represented by a Joulean product involving this second-order current density. The global generation problem is solved in the simplest cases. The escaping energy flux in the sideband omega is shown to be represented as a folding between the power spectrum of the local source and a squared Airy function. This power spectrum has been calculated from numerical simulations of electromagnetically driven Langmuir turbulence, using a one-dimensional model of the Zakharov type, for varying values of the parameters. For parameters in the cascade range, narrow line structured spectra were obtained, while for parameters in the cavitation range, very broad featureless spectra were obtained. Comparison with recent experimental stimulated electromagnetic emissions data did not confirm a signature for the existence of cavitation in the experiments. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM. RP MJOLHUS, E (reprint author), UNIV TROMSO,INST MATH & PHYS SCI,N-9037 TROMSO,NORWAY. NR 67 TC 22 Z9 23 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD SEP 1 PY 1995 VL 100 IS A9 BP 17527 EP 17541 DI 10.1029/95JA01158 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RT743 UT WOS:A1995RT74300050 ER PT J AU WATERS, LC COUNTS, RW PALAUSKY, A JENKINS, RA AF WATERS, LC COUNTS, RW PALAUSKY, A JENKINS, RA TI COLORIMETRIC STRIP TESTS - A COMPARISON OF VISUAL AND REFLECTOMETRIC MEASUREMENTS FOR QUANTITATIVE APPLICATIONS SO JOURNAL OF HAZARDOUS MATERIALS LA English DT Article DE COLORIMETRIC STRIP TESTS; REFLECTOMETRY; QUANTITATIVE ANALYSIS AB The use of indicator-based colorimetric strip tests for measuring chromate and nitrate in spiked and waste water samples was validated. Test strip readings made by reflectometry were significantly more accurate and reproducible than those made by a visual comparisons to a reference color chart. Each of the analytes was consistently detected at 1 to 2 mu g/ml, using the reflectometer. There was an excellent correlation between the analytical results obtained with the strip tests and those obtained using the more traditional laboratory methods of inductively coupled plasma/mass spectrometry and ion chromatography. This study shows that the use of strip tests for field screening, and as a prescreen in the laboratory, can be a time- and cost-effective alternative or adjunct to currently used laboratory methods. C1 OAK RIDGE NATL LAB,DIV COMP APPLICAT,OAK RIDGE,TN 37831. RP WATERS, LC (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,BLDG 4500S,POB 2008,OAK RIDGE,TN 37831, USA. NR 12 TC 7 Z9 8 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3894 J9 J HAZARD MATER JI J. Hazard. Mater. PD SEP PY 1995 VL 43 IS 1-2 BP 1 EP 12 DI 10.1016/0304-3894(95)00022-M PG 12 WC Engineering, Environmental; Engineering, Civil; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA RN691 UT WOS:A1995RN69100002 ER PT J AU SHURBAJI, ARM PHILLIPS, FM CAMPBELL, AR KNOWLTON, RG AF SHURBAJI, ARM PHILLIPS, FM CAMPBELL, AR KNOWLTON, RG TI APPLICATION OF A NUMERICAL-MODEL FOR SIMULATING WATER-FLOW, ISOTOPE TRANSPORT, AND HEAT-TRANSFER IN THE UNSATURATED ZONE SO JOURNAL OF HYDROLOGY LA English DT Article ID DRY SOILS; O-18; DEUTERIUM; EVAPORATION; MOVEMENT; HYDROGEN; EQUATION; ZINC; SET AB A controlled field experiment was conducted to provide data for a one-dimensional numerical model for simulating transient water flow, isotope transport, and heat transfer in the unsaturated zone (ODWISH). The experiment consisted of allowing water to evaporate from homogeneously packed sand columns and periodically sampling to observe changes in the distributions of moisture, temperature, and oxygen-18 enrichment. The peaks of the oxygen-18 distributions were used to determine the value of moisture content at liquid discontinuity, a parameter important for modeling water vapor flow. Modeling transient second-stage evaporation from soil necessitated implementing a retention relation Psi(theta) that is applicable for dry soils, above the evaporation front, where vapor flow is dominant. A retention model for dry soils was developed, connected to the Van Genuchten model and the resulting two-segment retention relation was implemented in the numerical model. The connection point for the retention relation is the moisture content at liquid discontinuity, which was also used in the numerical model to locate the evaporation front. Simulations showed that the ODWISH model reproduces reasonably well the experimental distributions of moisture content, isotopic enrichment, and temperature, and that the model accounts for the major processes involved in water movement in the shallow unsaturated zone and the associated isotope transport. The most significant discrepancies between the simulations and the experimental data can probably be attributed to inadequencies of the available two-segment Psi(theta) relationship over the wide range of pressure heads Psi encountered during the experiment. The ODWISH model was employed to test the sensitivity of the isotope profile development to diurnal variations in temperature and humidity. The results indicated that daily, or even weekly, averages are adequate for predicting isotope profile development. C1 NEW MEXICO INST MIN & TECHNOL,DEPT GEOSCI,SOCORRO,NM 87801. SANDIA NATL LABS,ALBUQUERQUE,NM. NR 28 TC 33 Z9 37 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-1694 J9 J HYDROL JI J. Hydrol. PD SEP PY 1995 VL 171 IS 1-2 BP 143 EP 163 DI 10.1016/0022-1694(95)02756-F PG 21 WC Engineering, Civil; Geosciences, Multidisciplinary; Water Resources SC Engineering; Geology; Water Resources GA RP736 UT WOS:A1995RP73600009 ER PT J AU KOLBERT, AC BIELECKI, A AF KOLBERT, AC BIELECKI, A TI BROAD-BAND HARTMANN-HAHN MATCHING IN MAGIC-ANGLE-SPINNING NMR VIA AN ADIABATIC FREQUENCY SWEEP SO JOURNAL OF MAGNETIC RESONANCE SERIES A LA English DT Article ID POLARIZATION MAS NMR; PROTON-ENHANCED NMR; CROSS-POLARIZATION; PULSE SEQUENCES; SIDE-BAND; SOLIDS; SPECTRA; INVERSION AB The cross-polarization condition in high-speed magic-angle spinning NMR is investigated in which the H-1 frequency is swept adiabatically from on-resonance to an off-resonance value during the spin lock, The H-1 frequency sweep dramatically broadens the matching conditions, leading to a nearly flat profile over a wide range of C-13 radiofrequency field strengths, These results can be understood by viewing the frequency-swept H-1 spin-locking field in the tilted rotating frame in which the nutation rate about the effective field, omega(eff) = (omega(1)(2)+Delta omega(2))(1/2), varies over the duration of the spin lock, broadening the matching condition, omega(eff,I) = omega(1S) +/- n omega(r). Experimental results on [1-C-13]glycine, [2-C-13,N-15]glycine, and [3-C-13]D,L-alanine are reported. (C) 1995 Academic Press, Inc. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. BRUKER INSTRUMENTS INC,BILLERICA,MA 01821. RP KOLBERT, AC (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 30 TC 33 Z9 33 U1 0 U2 4 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 1064-1858 J9 J MAGN RESON SER A JI J. Magn. Reson. Ser. A PD SEP PY 1995 VL 116 IS 1 BP 29 EP 35 DI 10.1006/jmra.1995.1186 PG 7 WC Physics, Atomic, Molecular & Chemical SC Physics GA RY919 UT WOS:A1995RY91900004 ER PT J AU DIKANOV, SA BOWMAN, MK AF DIKANOV, SA BOWMAN, MK TI CROSS-PEAK LINESHAPE OF 2-DIMENSIONAL ESEEM SPECTRA IN DISORDERED S=1/2, I=1/2 SPIN SYSTEMS SO JOURNAL OF MAGNETIC RESONANCE SERIES A LA English DT Note ID ECHO ENVELOPE MODULATION; SPECTROSCOPY; SINGULARITIES; HYSCORE C1 RUSSIAN ACAD SCI, INST CHEM KINET & COMBUST, NOVOSIBIRSK 630090, RUSSIA. RP DIKANOV, SA (reprint author), PACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, RICHLAND, WA 99352 USA. RI Bowman, Michael/F-4265-2011 OI Bowman, Michael/0000-0003-3464-9409 NR 13 TC 95 Z9 95 U1 1 U2 21 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 1064-1858 J9 J MAGN RESON SER A JI J. Magn. Reson. Ser. A PD SEP PY 1995 VL 116 IS 1 BP 125 EP 128 DI 10.1006/jmra.1995.1199 PG 4 WC Physics, Atomic, Molecular & Chemical SC Physics GA RY919 UT WOS:A1995RY91900017 ER PT J AU MCLUCKEY, SA VAIDYANATHAN, G HABIBIGOUDARZI, S AF MCLUCKEY, SA VAIDYANATHAN, G HABIBIGOUDARZI, S TI CHARGED VS NEUTRAL NUCLEOBASE LOSS FROM MULTIPLY-CHARGED OLIGONUCLEOTIDE ANIONS SO JOURNAL OF MASS SPECTROMETRY LA English DT Article ID IONIZATION MASS-SPECTROMETRY; COLLISION-INDUCED DISSOCIATION; ELECTROSPRAY-IONIZATION; PROTONATED MOLECULES; GAS-PHASE; ION TRAP; BIOMOLECULES; PRINCIPLES; COMPLEXES; SUBSTRATE AB Tandem mass spectra of a variety of adenine-containing deoxynucleic acid anions obtained using collisional activation in a quadrupole ion trap are described. Data are reported for singly charged mono-, di- and trinucleotide species, and also for multiply charged anions derived from tri-, tetra-, penta- and hexanucleotides, Attention is focused on the first step in the unimolecular decomposition of these species, namely the loss of the nucleobase. Specifically, the competition between the loss of the nucleobase as a neutral versus its loss as an anion is addressed within the context of a proposed proton-bound intermediate consisting of the nucleobase and a phosphodiester linkage. The data are interpreted on the basis of the energy surface involved in the break-up of the proton-bound intermediate, which can explain why the competition between loss of a neutral versus charged base is strongly dependent upon the charge of the parent ion. RP MCLUCKEY, SA (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831, USA. RI McLuckey, Scott/B-2203-2009; Vaidyanathan, Ganesan/I-5728-2013 OI McLuckey, Scott/0000-0002-1648-5570; NR 34 TC 68 Z9 69 U1 0 U2 1 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 1076-5174 J9 J MASS SPECTROM JI J. Mass Spectrom. PD SEP PY 1995 VL 30 IS 9 BP 1222 EP 1229 DI 10.1002/jms.1190300903 PG 8 WC Biophysics; Chemistry, Organic; Spectroscopy SC Biophysics; Chemistry; Spectroscopy GA RU886 UT WOS:A1995RU88600002 ER PT J AU MILNE, CJ LIGHTFOOT, P JORGENSEN, JD SHORT, S AF MILNE, CJ LIGHTFOOT, P JORGENSEN, JD SHORT, S TI SYNTHESIS AND STRUCTURE OF BI2LAO4CL - A NOVEL VARIANT OF THE SILLEN PHASES SO JOURNAL OF MATERIALS CHEMISTRY LA English DT Article AB A new series of layered oxyhalides, Bi(2)MO(4)Cl (M = La, Nd, Y), has been synthesized. Bi2LaO4Cl has been characterised by a combination of X-ray and neutron powder diffraction: space group P4/mmm, a = 3.9547(1), c = 9.1275(3) Angstrom. The structure consists of alternating layers of 'triple fluorite', [M(3)O(4)](+) and halide, Cl-. Within the fluorite layers there is perfect ordering of the cations, -Bi-O-2-La-O-2-Bi, such that La is coordinated only by oxide layers and Bi by both oxide and chloride layers. This phase represents the simplest example of an intergrowth structure containing the [M(3)O(4)] block layer, which is found in several of the copper oxide superconductors. The structure also suggests the existence of a new family of layered oxyhalides parallel with the well known Sillen phases, [M(2)O(2)]X(n), with triple [M(3)O(4)] fluorite layers replacing the normal double [M(2)O(2)] layers. C1 UNIV ST ANDREWS,SCH CHEM,ST ANDREWS KY16 9ST,FIFE,SCOTLAND. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. NR 11 TC 11 Z9 11 U1 1 U2 7 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0959-9428 J9 J MATER CHEM JI J. Mater. Chem. PD SEP PY 1995 VL 5 IS 9 BP 1419 EP 1421 DI 10.1039/jm9950501419 PG 3 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA RU094 UT WOS:A1995RU09400020 ER PT J AU SCHNEIBEL, JH MARTINEZ, L AF SCHNEIBEL, JH MARTINEZ, L TI ATOMIC-FORCE MICROSCOPY OF SLIP LINES IN FEAL SO JOURNAL OF MATERIALS RESEARCH LA English DT Note AB Fe-40 at. % Al-0.1 at. % B specimens were polished flat, strained at room temperature, and examined in an atomic force microscope. The angles of height contours perpendicular to the slip lines were interpreted as shear strains and were statistically evaluated. The frequency distributions of these shear strains correlated well with the macroscopic strains. The maximum shear strains found were not much larger than the macroscopic strains. In particular, no steep slip steps corresponding to large local shears were found. C1 Univ Nacl Autonoma Mexico, INST FIS, CUERNAVACA LAB, CUERNAVACA 62210, MORELOS, MEXICO. RP SCHNEIBEL, JH (reprint author), OAK RIDGE NATL LAB, DIV MET & CERAM, POB 2008, OAK RIDGE, TN 37831 USA. NR 6 TC 6 Z9 6 U1 0 U2 1 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD SEP PY 1995 VL 10 IS 9 BP 2159 EP 2161 DI 10.1557/JMR.1995.2159 PG 3 WC Materials Science, Multidisciplinary SC Materials Science GA RQ714 UT WOS:A1995RQ71400001 ER PT J AU SCHILLING, CH BABCOCK, T WANG, S JANE, J AF SCHILLING, CH BABCOCK, T WANG, S JANE, J TI MECHANICAL-PROPERTIES OF BIODEGRADABLE SOY-PROTEIN PLASTICS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article AB Experiments were performed to evaluate the room-temperature mechanical properties of soy-protein that were compression-molded with varying concentrations of glycerin plasticizer. Specimens exhibited stiff and brittle behavior with good tensile strength reliability based on Weibull statistics analysis. Raising the glycerin concentration from 0 to 20% progressively increased the tensile strain-to-failure from 1.1 to 1.8% and reduced the tensile strength from 42.1 to 23.6 MPa, the tangent modulus from 4.56 to 1.79 GPa, and the Rockwell hardness from R118.4 to R75.7. Ultrasonic measurements indicated that raising the glycerin concentration from 0 to 20% increased Poisson's ratio from 0.348 to 0.409 and reduced Young's modulus from 7.01 to 5.4 GPa and the shear modulus from 2.5 to 1.8 GPa. Significant increases in the tensile strength and the strength reliability resulted from eliminating Griffith's flaws by sieving the press powder before compression molding. Rockwell hardness rapidly decreased upon immersing these plastics in water at 25 degrees C, an effect which was pronounced for the glycerin-containing specimens. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT FOOD SCI & HUMAN NUTR,CTR CROPS UTILIZAT RES,AMES,IA 50011. RP SCHILLING, CH (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 10 TC 43 Z9 44 U1 0 U2 2 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD SEP PY 1995 VL 10 IS 9 BP 2197 EP 2202 DI 10.1557/JMR.1995.2197 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA RQ714 UT WOS:A1995RQ71400007 ER PT J AU TKACZYK, JE SUTLIFF, JA DELUCA, JA BEDNARCZYK, PJ BRIANT, CL WANG, ZL GOYAL, A KROEGER, DM LOWNDES, DH SPECHT, ED AF TKACZYK, JE SUTLIFF, JA DELUCA, JA BEDNARCZYK, PJ BRIANT, CL WANG, ZL GOYAL, A KROEGER, DM LOWNDES, DH SPECHT, ED TI TEXTURE AND TRANSPORT IN SPRAY PYROLYZED TLBA2CA2CU3O9 THICK-FILMS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID WEAK-LINK BEHAVIOR; CRITICAL CURRENTS; GRAIN-BOUNDARIES; PHASE; SUPERCONDUCTORS; YBA2CU3O7 AB The electron backscattering pattern technique has been applied to the microstructural investigation of Tl(1223) thick films formed by vapor-phase thallination of Ag-containing Ba-Ca-Cu-oxide precursors. For samples grown on polycrystalline YSZ, considerable biaxial alignment is found in localized, multigrain regions as wide a 100 mu m or more. However, on scales above 1 mm the overall texture remains only uniaxial with the c-axes (i.e., [001]) aligned perpendicular to the plane of the substrate. On single-crystal KTaO3 an epitaxial relationship is evident which persists to the surface of a 3 mu m thick film. Modest variations in the processing protocol yield films containing grains oriented with the c-axis in the plane, resulting in the degradation of transport properties. The data suggest a growth mode in which sparse nucleation occurs at the substrate followed by rapid lateral crystallization. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP TKACZYK, JE (reprint author), GE CO,RES & DEV,SCHENECTADY,NY 12301, USA. RI Wang, Zhong Lin/E-2176-2011; Specht, Eliot/A-5654-2009 OI Wang, Zhong Lin/0000-0002-5530-0380; Specht, Eliot/0000-0002-3191-2163 NR 32 TC 7 Z9 7 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD SEP PY 1995 VL 10 IS 9 BP 2203 EP 2210 DI 10.1557/JMR.1995.2203 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA RQ714 UT WOS:A1995RQ71400008 ER PT J AU LEE, J HWANG, JH MASHEK, JJ MASON, TO MILLER, AE SIEGEL, RW AF LEE, J HWANG, JH MASHEK, JJ MASON, TO MILLER, AE SIEGEL, RW TI IMPEDANCE SPECTROSCOPY OF GRAIN-BOUNDARIES IN NANOPHASE ZNO SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID METAL PARTICLES; NANOCRYSTALLINE; VARISTORS; SURFACE; TIO2 AB Sintered compacts of nanophase ZnO (similar to 60 nm average grain size, presintered at 600 degrees C) were made from powders (similar to 13 nm) prepared by the gas-condensation technique. Impedance spectra were taken as a function of temperature over the range 450-600 degrees C and as a function of oxygen partial pressure over the range 10(-3)-1 atm (550 and 600 degrees C only). The activation energy was determined to be 55 kJ/mole (0.57 eV) and was independent of oxygen partial pressure. The oxygen partial pressure exponent was -1/6. Impedance spectra exhibited nonlinear I-V behavior, with a threshold of approximately 6 V. These results indicate that grain boundaries are governing the electrical properties of the compact, Ramifications for oxygen sensing and for grain boundary defect characterization are discussed. C1 NORTHWESTERN UNIV,DEPT MAT SCI,EVANSTON,IL 60208. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP LEE, J (reprint author), UNIV NOTRE DAME,DEPT CHEM ENGN,NOTRE DAME,IN 46556, USA. RI Mason, Thomas/B-7528-2009 NR 29 TC 112 Z9 114 U1 2 U2 8 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD SEP PY 1995 VL 10 IS 9 BP 2295 EP 2300 DI 10.1557/JMR.1995.2295 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA RQ714 UT WOS:A1995RQ71400019 ER PT J AU WANG, HF GERBERICH, WW ANGELO, JE AF WANG, HF GERBERICH, WW ANGELO, JE TI INTERFACIAL REACTIONS AND ADHESION STRENGTH OF METAL/CERAMIC COMPOSITES SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID SIC MONOFILAMENTS; METAL; TITANIUM; HARDNESS; BARRIER AB The interfacial fracture energy of Ti/Al2O3 composites was measured with and without a diffusion barrier at different bonding temperatures by using four-point bending tests. It was found that the interfacial fracture energy increases with increasing bonding temperature up to 950 degrees C. When the bonding temperature was further raised to 1000 degrees C, the interfacial fracture energy drops. The decrease of the interfacial fracture energy is due to the formation of the continuous intermetallic compound, Ti3Al, at the interface between Ti and Al2O3. By using a diffusion barrier, the interfacial fracture energy decreases from 25.4 to near 0 J/m(2) and 32.9 to 8.7 J/m(2) for applied bonding temperatures of 800 and 900 degrees C, respectively, This is because the diffusion barrier reduced the diffusion of Al across the interface and into the Ti, thereby preventing a strong chemical bond at the interface. For the composite bonded at 900 degrees C, the crack propagation was found to occur at the interface between the Ti and Al2O3 The interfacial failure was found to be in the Ti3Al reaction layer for the composite processed at 1000 degrees C. With a diffusion barrier, the crack propagation path follows several interfaces, Evaluation of the processing temperature on the mechanical properties of the Ti was also obtained by using a nanoindentation technique. C1 UNIV MINNESOTA,DEPT CHEM ENGN & MAT SCI,MINNEAPOLIS,MN 55455. SANDIA NATL LABS,LIVERMORE,CA 94550. RP WANG, HF (reprint author), UNIV FLORIDA,DEPT MAT SCI & ENGN,GAINESVILLE,FL 32611, USA. NR 22 TC 4 Z9 4 U1 0 U2 3 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD SEP PY 1995 VL 10 IS 9 BP 2367 EP 2373 DI 10.1557/JMR.1995.2367 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA RQ714 UT WOS:A1995RQ71400028 ER PT J AU RUSSELL, AM CHUMBLEY, LS ELLIS, TW LAABS, FC NORRIS, B DONIZETTI, GE AF RUSSELL, AM CHUMBLEY, LS ELLIS, TW LAABS, FC NORRIS, B DONIZETTI, GE TI IN-SITU STRENGTHENING OF TITANIUM WITH YTTRIUM - TEXTURE ANALYSIS SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID PROCESSED COMPOSITE-MATERIALS; CU-NB COMPOSITE; INTERPHASE BARRIER; INSITU COMPOSITES; ALLOYS; MICROSTRUCTURE; WIRES AB In situ processing consists of heavily deforming a two-phase alloy of mutually immiscible elements to produce composite sheet or wire. In the well-studied Cu(fcc)-Nb(bcc) system, severe deformation by swaging and drawing reduces as-cast Nb filament phase thicknesses several hundred-fold after deformation. Cu-20 vol % Nb ultimate tensile strengths exceed 2000 MPa for material deformed to a true strain of eta = 12, where eta = In (area(original)/area(final)). In an earlier study of in situ strengthening in immiscible hexagonal close-packed metals, Ti-50 vol % Y and Ti-20 vol % Y alloys were deformed by hot extrusion, hot and cold swaging. The composites were deformation processed to true strains as high as eta = 7.6 to form a filamentary microstructure with filament thicknesses on the order of 0.1 mu m. The deformation processing of these composites increased their ultimate tensile strengths from 318 to 945 MPa, but the specimens' original diameters were too small to allow deformation processing to the very high true strains achieved with the Cu-Nb composites. In this study, a larger casting of Ti-20 vol % Y was deformation processed to eta = 12.8 in an attempt to achieve further refinement of the filament thickness. This composite formed the same filamentary microstructure up to eta = 7.27 observed in the earlier study of Ti-Y composites; however, at higher eta values the filaments recrystallized into equiaxed grains, decreasing the ultimate tensile strength. X-ray texture analysis of the composite specimens showed a strong [<10 (1)over bar 0>] fibre texture in both the Ti and Y phases in the deformation processing range 2.25 less than or equal to eta less than or equal to 7.27. This texturing is thought to constrain both the Ti and Y phases to deform by plane strain, which produces severe geometric restrictions on the ability of the plane straining filaments to achieve high eta values without fracturing or recrystallizing. C1 ROHR INC,CHULA VISTA,CA 92012. G&S TITANIUM,WOOSTER,OH 44691. RP RUSSELL, AM (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. OI Russell, Alan/0000-0001-5264-0104 NR 24 TC 20 Z9 20 U1 1 U2 3 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD SEP 1 PY 1995 VL 30 IS 17 BP 4249 EP 4262 DI 10.1007/BF00361504 PG 14 WC Materials Science, Multidisciplinary SC Materials Science GA TH658 UT WOS:A1995TH65800006 ER PT J AU STINTON, DP HEMBREE, DM MORE, KL SHELDON, BW BESMANN, TM HEADINGER, MH DAVIS, RF AF STINTON, DP HEMBREE, DM MORE, KL SHELDON, BW BESMANN, TM HEADINGER, MH DAVIS, RF TI MATRIX CHARACTERIZATION OF FIBER-REINFORCED SIC MATRIX COMPOSITES FABRICATED BY CHEMICAL-VAPOR INFILTRATION SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID SILICON-CARBIDE; CERAMICS; STRAIN; FIBERS AB Ceramic matrix composites (CMCs), that consist of silicon carbide (SIC) reinforced with continuous Nicalon(TM) or T-300(R)-fibres, are being developed for many high-temperature structural applications. The large potential use of CMCs has prompted an in-depth investigation and characterization of these materials. Electron microscopy and micro-Raman spectroscopy were used to characterize and compare the SIC matrix crystal structure and morphology of composite materials fabricated by two different chemical vapour infiltration (CVI) processes. C1 DU PONT LANXIDE COMPOSITES INC,NEWARK,DE 19714. N CAROLINA STATE UNIV,RALEIGH,NC 27695. RP STINTON, DP (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. RI Davis, Robert/A-9376-2011; More, Karren/A-8097-2016 OI Davis, Robert/0000-0002-4437-0885; More, Karren/0000-0001-5223-9097 NR 19 TC 11 Z9 11 U1 0 U2 4 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD SEP 1 PY 1995 VL 30 IS 17 BP 4279 EP 4285 DI 10.1007/BF00361507 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA TH658 UT WOS:A1995TH65800009 ER PT J AU RAMSEY, RS MCLUCKEY, SA AF RAMSEY, RS MCLUCKEY, SA TI CAPILLARY ELECTROPHORESIS ELECTROSPRAY-IONIZATION ION-TRAP MASS-SPECTROMETRY USING A SHEATHLESS INTERFACE SO JOURNAL OF MICROCOLUMN SEPARATIONS LA English DT Article DE MASS SPECTROMETRY; ONLINE CAPILLARY ELECTROPHORESIS; MS/MS ANALYSIS; SHEATHLESS ELECTROSPRAY SOURCE; PEPTIDES ID ON-COLUMN TRANSIENT; ZONE ELECTROPHORESIS; DETECTION LIMITS; ISOTACHOPHORESIS; PRECONCENTRATION; IMPROVEMENT; PROTEINS; SAMPLES; VOLUME AB The sensitivity that can be obtained with the quadrupole ion trap for on-line CE analysis using a sheathless electrospray interface and gold-tipped columns is examined. Capillaries of different i.d. are compared in continuous infusion experiments and the effects of sheath solvents on the signal for some peptides and proteins are illustrated. The sheathless CE/ITMS system using 20 mu m i.d. columns is shown to provide mid-attomole detection levels for leucine enkephalin in total ion electropherograms under full scan conditions. Good quality MS/MS spectra are also obtained for low femtomole injections of this peptide. (C) 1995 John Wiley & Sons, Inc. RP RAMSEY, RS (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831, USA. RI McLuckey, Scott/B-2203-2009 OI McLuckey, Scott/0000-0002-1648-5570 NR 28 TC 39 Z9 39 U1 1 U2 6 PU MICROSEPARATIONS INC PI PROVO PA DEPT CHEM BRIGHAM YOUNG UNIV, PROVO, UT 84602-1022 SN 1040-7685 J9 J MICROCOLUMN SEP JI J. Microcolumn Sep. PD SEP-OCT PY 1995 VL 7 IS 5 BP 461 EP 469 DI 10.1002/mcs.1220070505 PG 9 WC Chemistry, Analytical SC Chemistry GA TF385 UT WOS:A1995TF38500004 ER PT J AU YONG, WH CHOU, D UEKI, K HARSH, GR VONDEIMLING, A GUSELLA, JF MOHRENWEISER, HW LOUIS, DN AF YONG, WH CHOU, D UEKI, K HARSH, GR VONDEIMLING, A GUSELLA, JF MOHRENWEISER, HW LOUIS, DN TI CHROMOSOME-19Q DELETIONS IN HUMAN GLIOMAS OVERLAP TELOMERIC TO D19S219 AND MAY TARGET A 425 KB REGION CENTROMERIC TO D19S112 SO JOURNAL OF NEUROPATHOLOGY AND EXPERIMENTAL NEUROLOGY LA English DT Article DE CHROMOSOME 19; GLIOMA; LOSS OF HETEROZYGOSITY; OLIGODENDROGLIOMA; TUMOR SUPPRESSOR GENE, ERCC2, POLYMORPHISM ID MYOTONIC-DYSTROPHY REGION; TUMOR SUPPRESSOR; GENE; ASSOCIATION; CLONING; SEGMENT; REPEAT AB Chromosome 19q harbors a tumor suppressor gene that is involved in astrocytoma, oligodendroglioma and mixed glioma tumorigenesis. We had previously mapped this gene to an approximately 5 megabase region of chromosome 19q13.2-13.3 between APOC2 and HRC. To narrow the location of this tumor suppressor further, we studied 138 gliomas for loss of allelic heterozygosity at six microsatellite polymorphisms between APOC2 and HRC, including a newly described polymorphism in the ERCC2 gene. Allelic loss occurred in 48 gliomas (35%), including 25 of 41 oligodendroglial tumors (61%). Four cases had proximal breakpoints within the APOC2-HRC region, two telomeric to ERCC2 and two telomeric to D19S219. In addition, one of the latter tumors had an interstitial deletion between D19S219 and D19S112, a distance of only 425 kilobases surrounding the DM (myotonic dystrophy) gene. These findings suggest that the glioma tumor suppressor on chromosome 19q maps to 19q13.3, telomeric to D19S219 and perhaps centromeric to D19S112. The data exclude a number of candidate genes from 19q13.2-13.3, including a putative phosphatase gene and the DNA repair/metabolism genes ERCCl, ERCC2 and probably LIG1. C1 MASSACHUSETTS GEN HOSP,MOLEC NEUROONCOL LAB,BOSTON,MA 02129. MASSACHUSETTS GEN HOSP,DEPT PATHOL NEUROPATHOL,BOSTON,MA 02129. MASSACHUSETTS GEN HOSP,NEUROSURG SERV,BOSTON,MA 02129. MASSACHUSETTS GEN HOSP,MOLEC NEUROGENET UNIT,BOSTON,MA 02129. HARVARD UNIV,SCH MED,BOSTON,MA. LAWRENCE LIVERMORE NATL LAB,CTR HUMAN GENOME,LIVERMORE,CA. UNIV HOSP BONN,INST NEUROPATHOL,BONN,GERMANY. RI von Deimling, Andreas/F-7774-2013 OI von Deimling, Andreas/0000-0002-5863-540X FU NCI NIH HHS [CA57683, T32-CA90216] NR 34 TC 37 Z9 37 U1 0 U2 0 PU AMER ASSN NEUROPATHOLOGISTS INC PI LAWRENCE PA 1041 NEW HAMPSHIRE ST, LAWRENCE, KS 66044 SN 0022-3069 J9 J NEUROPATH EXP NEUR JI J. Neuropathol. Exp. Neurol. PD SEP PY 1995 VL 54 IS 5 BP 622 EP 626 DI 10.1097/00005072-199509000-00002 PG 5 WC Clinical Neurology; Neurosciences; Pathology SC Neurosciences & Neurology; Pathology GA RU105 UT WOS:A1995RU10500002 PM 7666049 ER PT J AU ROHE, RC THOMAS, SR STABIN, MG DEUTSCH, EA GERSON, MC CUMMINGS, DD MAXON, HR AF ROHE, RC THOMAS, SR STABIN, MG DEUTSCH, EA GERSON, MC CUMMINGS, DD MAXON, HR TI BIOKINETICS AND DOSIMETRY ANALYSIS IN HEALTHY-VOLUNTEERS FOR A 2-INJECTION (REST-STRESS) PROTOCOL OF THE MYOCARDIAL PERFUSION IMAGING AGENT TECHNETIUM-99M LABELED Q3 SO JOURNAL OF NUCLEAR CARDIOLOGY LA English DT Article DE DOSIMETRY; MYOCARDIAL; BIODISTRIBUTION; PHARMACOKINETICS ID HUMAN BIODISTRIBUTION; DIPYRIDAMOLE; SAFETY; TL-201 AB Background. Trans (N,N'-ethylene bis(acetylacetoneimine)) bis (tris(3-methoxy-1-propyl) phosphine) Tc-99m(III) (Tc-99m-Q3) has been developed for myocardial perfusion imaging. Biokinetic studies and dosimetry analysis have been completed for six healthy volunteers. Methods and Results. The same-day two-injection protocol involved (1) an average rest injection of 241 MBq of Tc-99m-Q3 followed by myocardial single-photon emission computed tomography (SPECT) at 15.0 minutes and a whole body (WB) scan at 1.5 hours; and (2) an average stress injection during treadmill exercise of 744 MBq of Tc-99m-Q3 at 2.4 hours (postrest injection) followed by myocardial SPECT and additional WE scans at 1.5, 3.5, 6.5, and 21 hours poststress injection, Total urine was collected over 24 hours. Absolute organ activities were determined by conjugate counting methods. The two-injection data were simplified to a one-injection equivalent data set to facilitate dosimetry analysis. Decay corrected average percentage uptake values, plus or minus one standard deviation, for the myocardium were 1.4% +/- 0.2% at approximately 1.5 hours for both the postrest and poststress injections. The average biologic half-time for the myocardium was 26.4 hours. The highest organ uptake values included the gallbladder with 5.5% +/- 1.9% and the liver with 4.1% +/- 1.0% at the 1.5 hours poststress scan time, The sum of all gastrointestinal (GI) tract components was 18.8% +/- 9.4% at approximately 6.5 hours poststress injection (before any fecal elimination). The total 24 hour urine clearance was 17.1% +/- 2.4%. The gallbladder wall and upper large intestine wall received the highest doses at 0.024 and 0.023 mGy/MBq, respectively. Conclusion. The effective dose equivalent is estimated to be 0.01 mSv/MBq, which for an administration of 1110 MBq (30 mCi) is less than half that of a standard imaging protocol using 111 MBq (3 mCi) of Tl-201, and comparable to the published estimates for Tc-99m-labeled sestamibi and Tc-99m-labeled tetrofosmin (also normalized to 1110 MBq of administered activity). The Tc-99m-Q3 exhibits myocardium uptake similar to that for these other two Tc-99m agents. C1 UNIV CINCINNATI,MED CTR,DEPT INTERNAL MED,DIV CARDIOL,CINCINNATI,OH 45267. OAK RIDGE INST SCI & EDUC,OAK RIDGE,TN. MALLINCKRODT MED INC,ST LOUIS,MO. RP ROHE, RC (reprint author), UNIV CINCINNATI,MED CTR,DEPT RADIOL,EL SAENGER RADIOISOTOPE LAB,POB 670577,CINCINNATI,OH 45267, USA. FU NHLBI NIH HHS [HL21276-14] NR 22 TC 11 Z9 11 U1 0 U2 3 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 1071-3581 J9 J NUCL CARDIOL JI J. Nucl. Cardiol. PD SEP-OCT PY 1995 VL 2 IS 5 BP 395 EP 404 DI 10.1016/S1071-3581(05)80027-3 PG 10 WC Cardiac & Cardiovascular Systems; Radiology, Nuclear Medicine & Medical Imaging SC Cardiovascular System & Cardiology; Radiology, Nuclear Medicine & Medical Imaging GA RY913 UT WOS:A1995RY91300005 PM 9420819 ER PT J AU FOSTER, JP PORTER, DL HARROD, DL MAGER, TR BURKE, MG AF FOSTER, JP PORTER, DL HARROD, DL MAGER, TR BURKE, MG TI 316-STAINLESS-STEEL CAVITY SWELLING IN A PWR SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID HFIR AB Swelling was measured on a cold-worked (CW) 316 stainless steel (SS) flux-thimble tube irradiated in a Pressurized Water Reactor (PWR) plant. The measured swelling was approximately 0.03% (in the range of 0.01 to 0.09%). The sample was irradiated at a temperature between 305 and 315 degrees C to a calculated dose of about 35 dpa. Comparison with High Flux Isotope Reactor (HFIR) swelling data suggests that the observed cavity swelling is due to helium bubbles. The PWR datum was extrapolated to the approximate end-of-life reactor internals component dose of 100 dpa using HFIR swelling data. HFIR CW 316 SS swelling data indicate that swelling will be less than 3% at 100 dpa in the temperature range between 300 degrees C and 440 degrees C. Garner [1,2] has proposed that large amounts of swelling (> 10%) and severe swelling-embrittlement could possibly occur in PWR reactor internals during post shutdown handling. Since the PWR and HFIR end-of-life extrapolated swelling values are probably Less than 3%, the proposed swelling and swelling-embrittlement is not considered to apply to PWR reactor internals fabricated with CW 316 SS and operating at temperatures between 300 degrees C and 440 degrees C. C1 ARGONNE NATL LAB,IDAHO FALLS,ID 83401. WESTINGHOUSE ELECT CORP,PENSACOLA,FL 32514. WESTINGHOUSE ELECT CORP,MONROEVILLE ENERGY CTR,MONROEVILLE,PA 15146. WESTINGHOUSE ELECT CORP,BETTIS ATOM POWER LAB,W MIFFLIN,PA. RP FOSTER, JP (reprint author), WESTINGHOUSE ELECT CORP,CTR SCI & TECHNOL,1310 BEULAH RD,PITTSBURGH,PA 15235, USA. NR 8 TC 15 Z9 15 U1 2 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1995 VL 224 IS 3 BP 207 EP 215 DI 10.1016/0022-3115(95)00086-0 PG 9 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA RU454 UT WOS:A1995RU45400002 ER PT J AU SNEAD, LL BURCHELL, TD AF SNEAD, LL BURCHELL, TD TI THERMAL-CONDUCTIVITY DEGRADATION OF GRAPHITES DUE TO NEUTRON-IRRADIATION AT LOW-TEMPERATURE SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article AB Several graphites and carbon/carbon composites (C/C's) have been irradiated with fission neutrons near 150 degrees C and at fluences up to a displacement level of 0.24 dpa. The unirradiated room temperature thermal conductivity of these materials varied from 114 W/mK for H-451 isotropic graphite, to 670 W/mK for a unidirectional FMI-1D C/C composite. At the irradiation temperature a saturation reduction in thermal conductivity was seen to occur at displacement levels of approximately 0.1 dpa. All materials were seen to degrade to approximately 10 to 14% of their original thermal conductivity after irradiation. The significant recovery of thermal conductivity due to post-irradiation isochronal anneals is also presented. RP SNEAD, LL (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. RI Burchell, Tim/E-6566-2017 OI Burchell, Tim/0000-0003-1436-1192 NR 17 TC 24 Z9 27 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1995 VL 224 IS 3 BP 222 EP 229 DI 10.1016/0022-3115(95)00071-2 PG 8 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA RU454 UT WOS:A1995RU45400004 ER PT J AU JOHNSON, TK STABIN, M AF JOHNSON, TK STABIN, M TI FAST ACQUISITION FOR TC-99M SESTAMIBI SPECT - TO THE EDITOR SO JOURNAL OF NUCLEAR MEDICINE LA English DT Letter ID BREAST-MILK; EXCRETION; RADIOACTIVITY; IN-111 C1 OAK RIDGE ASSOCIATED UNIV,OAK RIDGE,TN. RP JOHNSON, TK (reprint author), UNIV COLORADO,HLTH SCI CTR,DENVER,CO 80262, USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 22090-5316 SN 0161-5505 J9 J NUCL MED JI J. Nucl. Med. PD SEP PY 1995 VL 36 IS 9 BP 1723 EP 1724 PG 2 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA RU095 UT WOS:A1995RU09500043 PM 7658238 ER PT J AU Liu, J Kim, AY Virden, JW AF Liu, J. Kim, A. Y. Virden, J. W. TI Preparation of Mesoporous Spherulites in Surfactant Solutions SO JOURNAL OF POROUS MATERIALS LA English DT Article DE spherulite; mesoporous; silicate; sphere AB A new mesoporous structure, silicate spherulite, has been produced in dilute surfactant and silicate solutions. The spherulites were formed from radially arranged rod-like micelles. The surfactant molecules in the rod-like micelles can be removed by heat treatment to leave a unique mesoporous material with radially arranged channels for easy access. Although the spherulite morphology has been observed in the nucleation and growth of polymeric crystals for a long time, it has not been reported in surfactant solutions. Similar to the polymeric materials, the surfactant spherulites are most likely the fingerprints of the early nucleation process in the preparation of ordered mesophase silicates. C1 [Liu, J.; Kim, A. Y.; Virden, J. W.] Pacific NW Natl Lab, Richland, WA 99352 USA. RP Liu, J (reprint author), Pacific NW Natl Lab, Battelle Blvd,Box 999, Richland, WA 99352 USA. FU U.S. Department of Energy [DE-AC06-76RLO 1830] FX Pacific Northwest Laboratory is a multiprogram national laboratory operated by Battelle Memorial Institute for the U.S. Department of Energy under contract DE-AC06-76RLO 1830. NR 13 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 1380-2224 J9 J POROUS MAT JI J. Porous Mat. PD SEP PY 1995 VL 2 IS 3 BP 201 EP 205 DI 10.1007/BF00488109 PG 5 WC Chemistry, Applied; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA V20GN UT WOS:000208128600002 ER PT J AU CLINE, MC MICKLOW, GJ YANG, SL NGUYEN, HL AF CLINE, MC MICKLOW, GJ YANG, SL NGUYEN, HL TI NUMERICAL-ANALYSIS OF THE FLOWFIELDS IN A STAGED GAS-TURBINE COMBUSTOR SO JOURNAL OF PROPULSION AND POWER LA English DT Article ID SPEEDS AB The KIVA-II code was modified to allow calculation of the flowfields in a staged gas turbine combustor including the air-blast fuel nozzle. The results illustrate the complicated flowfields present in staged combustors. In particular, the thermal protection requirements of the quick-quench mixer used in this study may be similar to those of the rich-burn combustor, despite the presence of the cool dilution jet. Variation of the mass flow split between the fuel nozzle air passages has a significant effect on the velocity and temperature profiles. In addition, the slanted dilution slots form a counter-rotating flowfield. From the results obtained to date, it appears that the modified KIVA-II code can be used to study the effects of various staged combustor designs and operating conditions. C1 UNIV FLORIDA,DEPT MECH ENGN,GAINESVILLE,FL 32601. MICHIGAN TECHNOL UNIV,DEPT MECH ENGN & ENGN MECH,HOUGHTON,MI 49931. NASA,LEWIS RES CTR,COMBUSTER TECHNOL BRANCH,CLEVELAND,OH 44135. RP CLINE, MC (reprint author), LOS ALAMOS NATL LAB,T3 GRP,POB 1663,LOS ALAMOS,NM 87545, USA. NR 27 TC 3 Z9 3 U1 0 U2 2 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0748-4658 J9 J PROPUL POWER JI J. Propul. Power PD SEP-OCT PY 1995 VL 11 IS 5 BP 894 EP 898 DI 10.2514/3.23914 PG 5 WC Engineering, Aerospace SC Engineering GA RU824 UT WOS:A1995RU82400002 ER PT J AU PHILLIPS, DR HAMILTON, VT JAMRISKA, DJ BRZEZINSKI, MA AF PHILLIPS, DR HAMILTON, VT JAMRISKA, DJ BRZEZINSKI, MA TI APPLICATION OF SEPHADEX TO RADIOCHEMICAL SEPARATIONS SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES LA English DT Article; Proceedings Paper CT 3rd International Conference on Methods and Applications of Radioanalytical Chemistry (MARC-III) CY APR 10-16, 1994 CL KAILUA KONA, HI SP Amer Nucl Soc, Div Isotopes & Radiat, Amer Nucl Soc, Div Biol & Med, Amer Nucl Soc, NO Calif Sect AB Heteropolymolybdic acid species of a variety of elements bind to Sephadex (dextran cross-linked by epichlorohydrin). Solution pH can be used as a variable to influence the formation of heteropolymolybdates and thus their affinity for Sephadex. Therefore this material may be used to chromatographically separate certain elements which have been reacted with molybdate in solution. In this paper we report the measurement of distribution coefficients on Sephadex for heteropolymolybdates of As, P, Ge, Si and Se for solutions of varying pH. We also describe the application of the technique to the recovery of Si-32 from proton-irradiated KCl targets and Ge-68 from proton-irradiated molybdenum targets. C1 UNIV CALIF SANTA BARBARA,DEPT BIOL SCI,SANTA BARBARA,CA 93106. RP PHILLIPS, DR (reprint author), LOS ALAMOS NATL LAB,RADIOISOTOPE PROGRAM,CST-11,MS J514,LOS ALAMOS,NM 87544, USA. NR 17 TC 4 Z9 4 U1 0 U2 0 PU AKADEMIAI KIADO PI BUDAPEST PA PO BOX 245, H-1519 BUDAPEST, HUNGARY SN 0236-5731 J9 J RADIOAN NUCL CH AR JI J. Radioanal. Nucl. Chem.-Artic. PD SEP PY 1995 VL 195 IS 2 BP 251 EP 261 DI 10.1007/BF02035964 PG 11 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA RP509 UT WOS:A1995RP50900004 ER PT J AU JAMRISKA, DJ TAYLOR, WA OTT, MA HEATON, RC PHILLIPS, DR FOWLER, MM AF JAMRISKA, DJ TAYLOR, WA OTT, MA HEATON, RC PHILLIPS, DR FOWLER, MM TI ACTIVATION RATES AND CHEMICAL RECOVERY OF CU-67 PRODUCED WITH LOW-ENERGY PROTON IRRADIATION OF ENRICHED ZN-70 TARGETS SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES LA English DT Article; Proceedings Paper CT 3rd International Conference on Methods and Applications of Radioanalytical Chemistry (MARC-III) CY APR 10-16, 1994 CL KAILUA KONA, HI SP Amer Nucl Soc, Div Isotopes & Radiat, Amer Nucl Soc, Div Biol & Med, Amer Nucl Soc, NO Calif Sect ID PORPHYRIN; COPPER-67 AB Copper-67 is a radioisotope with significant potential for diagnostic and therapeutic applications in nuclear medicine. Despite its promise, Cu-67 has failed to make an impact in clinical nuclear medicine, primarily because it is available sporadically, and in limited quantities. Common methods of production rely on high energy proton irradiation of natural zinc targets or on induced reactions using high energy neutrons at nuclear reactors. We have evaluated alternative production methods that could provide year-round adequate supply of this isotope. Using a low energy accelerator, we have studied the production of Cu-67 by proton reactions on enriched Zn-70. Our results indicate that it is possible to produce useful quantities of Cu-67 from the irradiation of enriched Zn-70 with protons that have energies of less than 20 MeV. Production rates are higher than currently used methods at high energy accelerators or reactors. This isotope can be made available throughout the year as a result of this research. RP JAMRISKA, DJ (reprint author), LOS ALAMOS NATL LAB,POB 1663,MS J514,LOS ALAMOS,NM 87545, USA. NR 15 TC 16 Z9 16 U1 0 U2 2 PU AKADEMIAI KIADO PI BUDAPEST PA PO BOX 245, H-1519 BUDAPEST, HUNGARY SN 0236-5731 J9 J RADIOAN NUCL CH AR JI J. Radioanal. Nucl. Chem.-Artic. PD SEP PY 1995 VL 195 IS 2 BP 263 EP 270 DI 10.1007/BF02035965 PG 8 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA RP509 UT WOS:A1995RP50900005 ER PT J AU HEATON, RC TAYLOR, WA PHILLIPS, DR JAMRISKA, DJ GARCIA, JB AF HEATON, RC TAYLOR, WA PHILLIPS, DR JAMRISKA, DJ GARCIA, JB TI RECENT DEVELOPMENTS IN ZINC-OXIDE TARGET CHEMISTRY SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES LA English DT Article; Proceedings Paper CT 3rd International Conference on Methods and Applications of Radioanalytical Chemistry (MARC-III) CY APR 10-16, 1994 CL KAILUA KONA, HI SP Amer Nucl Soc, Div Isotopes & Radiat, Amer Nucl Soc, Div Biol & Med, Amer Nucl Soc, NO Calif Sect AB Zinc oxide targets irradiated with high energy protons at the Los Alamos Meson Physics Facility (LAMPF) contain a number of radioactive spallation products in quantities large enough to warrant recovery. This paper describes methods for recovering Be-7, Sc-46 and V-48 from such targets and offers suggestions On possible ways to recover additional isotopes. The proposed methods are based on traditional precipitation and ion exchange techniques, are readily adaptable to hot cell use, and produce no hazardous waste components. The products are obtained in moderate to high yields and have excellent radionuclidic purity. RP HEATON, RC (reprint author), LOS ALAMOS NATL LAB,MAIL STOP J514,POB 1663,LOS ALAMOS,NM 87545, USA. NR 14 TC 0 Z9 0 U1 0 U2 1 PU AKADEMIAI KIADO PI BUDAPEST PA PO BOX 245, H-1519 BUDAPEST, HUNGARY SN 0236-5731 J9 J RADIOAN NUCL CH AR JI J. Radioanal. Nucl. Chem.-Artic. PD SEP PY 1995 VL 195 IS 2 BP 271 EP 277 DI 10.1007/BF02035966 PG 7 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA RP509 UT WOS:A1995RP50900006 ER PT J AU TAYLOR, WA JAMRISKA, DJ HAMILTON, VT HEATON, RC PHILLIPS, DR STAROSKI, RC GARCIA, JB GARCIA, JG OTT, MA AF TAYLOR, WA JAMRISKA, DJ HAMILTON, VT HEATON, RC PHILLIPS, DR STAROSKI, RC GARCIA, JB GARCIA, JG OTT, MA TI WASTE MINIMIZATION IN THE LOS-ALAMOS-MEDICAL-RADIOISOTOPE-PROGRAM SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES LA English DT Article; Proceedings Paper CT 3rd International Conference on Methods and Applications of Radioanalytical Chemistry (MARC-III) CY APR 10-16, 1994 CL KAILUA KONA, HI SP Amer Nucl Soc, Div Isotopes & Radiat, Amer Nucl Soc, Div Biol & Med, Amer Nucl Soc, NO Calif Sect ID TARGETS AB Since the mid-1970s the Los Alamos Medical Radioisotope Program has been irradiating target materials to produce and recover radioisotopes for applications in medicine, environmental science, biology, physics, materials research, and other disciplines where radiotracers find utility. By necessity, the chemical processing of targets and the isolation of radioisotopes generates radioactive waste materials. In recent years (here have been federal mandates requiring us to discontinue the use of hazardous materials and to minimize radioactive waste volumes. As a result, substantial waste reduction measures have been introduced at the irradiation facility, in processing approaches, and even in the ways the product isotopes are supplied to users. RP TAYLOR, WA (reprint author), LOS ALAMOS NATL LAB,RADIOISOTOPE PROGRAM,CST-11,MS J514,LOS ALAMOS,NM 87544, USA. NR 13 TC 2 Z9 2 U1 0 U2 2 PU AKADEMIAI KIADO PI BUDAPEST PA PO BOX 245, H-1519 BUDAPEST, HUNGARY SN 0236-5731 J9 J RADIOAN NUCL CH AR JI J. Radioanal. Nucl. Chem.-Artic. PD SEP PY 1995 VL 195 IS 2 BP 287 EP 295 DI 10.1007/BF02035968 PG 9 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA RP509 UT WOS:A1995RP50900008 ER PT J AU MOMCILOVIC, B LYKKEN, GI TAO, L WIELOPOLSKI, L AF MOMCILOVIC, B LYKKEN, GI TAO, L WIELOPOLSKI, L TI COMPARATIVE-ANALYSIS OF ZN-65 AND K-40 IN HUMAN URINE BY LIBRARY LEAST-SQUARES AND WINDOW METHODS USING A PERSONAL-COMPUTER SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES LA English DT Article; Proceedings Paper CT 3rd International Conference on Methods and Applications of Radioanalytical Chemistry (MARC-III) CY APR 10-16, 1994 CL KAILUA KONA, HI SP Amer Nucl Soc, Div Isotopes & Radiat, Amer Nucl Soc, Div Biol & Med, Amer Nucl Soc, NO Calif Sect AB The Library Least Squares method was adapted for use on a standard personal computer. It was found to be considerably more sensitive than the window method in the accurate assessment of Zn-65 and K-40 simultaneously presented in human urine samples. C1 UNIV N DAKOTA,DEPT PHYS,GRAND FORKS,ND 58202. BROOKHAVEN NATL LAB,DEPT RTF MED,UPTON,NY 11973. RP MOMCILOVIC, B (reprint author), USDA ARS,GRAND FORKS HUMAN NUTR RES CTR,GRAND FORKS,ND 58202, USA. NR 10 TC 2 Z9 2 U1 0 U2 0 PU AKADEMIAI KIADO PI BUDAPEST PA PO BOX 245, H-1519 BUDAPEST, HUNGARY SN 0236-5731 J9 J RADIOAN NUCL CH AR JI J. Radioanal. Nucl. Chem.-Artic. PD SEP PY 1995 VL 195 IS 2 BP 315 EP 319 DI 10.1007/BF02035971 PG 5 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA RP509 UT WOS:A1995RP50900011 ER PT J AU MARTIN, JE ODINEK, J AF MARTIN, JE ODINEK, J TI A LIGHT-SCATTERING STUDY OF THE NONLINEAR DYNAMICS OF ELECTRORHEOLOGICAL FLUIDS IN OSCILLATORY SHEAR SO JOURNAL OF RHEOLOGY LA English DT Article; Proceedings Paper CT Symposium on Electrorheology, Ferrofluids, and Particulate Flow, at the 66th Annual Meeting of the Society-of-Rheology CY OCT, 1994 CL PHILADELPHIA, PA SP Soc Rheol ID RHEOLOGY AB We report a real time, two-dimensional light-scattering study of the nonlinear dynamics of field-induced structures in an electrorheological (ER) fluid subjected to oscillatory shear. We have developed a simple kinetic chain model of the observed dynamics by considering the response of a fragmenting/aggregating particle chain to the prevailing hydrodynamic and electrostatic forces. This theory of the dynamics is then used to describe the nonlinear theology of ER fluids, and it is concluded that light scattering allows one to indirectly probe the stress in an ER fluid. (C) 1995 Society of Rheology. RP MARTIN, JE (reprint author), SANDIA NATL LABS,DIV ADV MAT PHYS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 13 TC 17 Z9 17 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0148-6055 J9 J RHEOL JI J. Rheol. PD SEP-OCT PY 1995 VL 39 IS 5 BP 995 EP 1009 DI 10.1122/1.550629 PG 15 WC Mechanics SC Mechanics GA RU728 UT WOS:A1995RU72800013 ER PT J AU RAI, D FELMY, AR FULTON, RW AF RAI, D FELMY, AR FULTON, RW TI ND3+ AM3+ ION INTERACTIONS WITH SULFATE ION AND THEIR INFLUENCE ON NDPO4(C) SOLUBILITY SO JOURNAL OF SOLUTION CHEMISTRY LA English DT Article DE SOLUBILITY; CRYSTALLINE NDPO4; SULFATE COMPLEXES; ND; AM; PITZER PARAMETERS; SOLUBILITY PRODUCT ID THERMODYNAMICS; ELECTROLYTES; SYSTEM; PREDICTION AB The effects of Nd(III)/Am(III) complexation with sulfate were studied by 1) re-examining existing data for the Am-SO4 system using more advanced aqueous electrolyte models valid to high concentration to obtain reliable thermodynamic data for SO42- complexes or ion interactions with Nd3+ and Am3+ and 2) conducting experimental solubility studies of NdPO4(c), an analog phase of AmPO4(c), a possibly important phase in high level nuclear wastes, in the presence of SO42- to test the newly developed thermodynamic model and show the possible influence of sulfate in a repository environment. The data showed that the increase in the solubility of NdPO4(c) resulted primarily from the increase in ionic strength. Slightly higher observed Nd concentrations in the presence of sulfate, as compared with concentrations predicted at the experimental ionic strengths, resulted from the weak complexes or ion interactions involving Nd3+-SO42-. The Pitzer ion interaction parameters, applicable to 0.5m sulfate, were obtained for Am3+-SO42- from a reinterpretation of known solvent extraction data. These parameters are also consistent with literature data for Am3+/Na+ exchange and solvent extraction in, the presence of sulfate. When used for the analogous Nd3+-SO42- system to predict NdPO4(c) solubility in the presence of sulfate, they provided excellent agreement between the predicted and the observed solubilities, indicating that they can be reliably used to determine Nd3+ or Am3+ ion interactions with SO42- in all ground waters where SO42- is less than 05m. RP RAI, D (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 31 TC 11 Z9 11 U1 0 U2 3 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0095-9782 J9 J SOLUTION CHEM JI J. Solut. Chem. PD SEP PY 1995 VL 24 IS 9 BP 879 EP 895 DI 10.1007/BF00973443 PG 17 WC Chemistry, Physical SC Chemistry GA RX552 UT WOS:A1995RX55200002 ER PT J AU OAKES, CS SIMONSON, JM BODNAR, RJ AF OAKES, CS SIMONSON, JM BODNAR, RJ TI APPARENT MOLAR VOLUMES OF AQUEOUS CALCIUM-CHLORIDE TO 250-DEGREES-C, 400 BARS, AND FROM MOLALITIES OF 0.242 TO 6.150 SO JOURNAL OF SOLUTION CHEMISTRY LA English DT Article DE THERMODYNAMICS; DENSITY; CALCIUM CHLORIDE; HIGH TEMPERATURE; PRESSURE EFFECTS ID THERMODYNAMIC PROPERTIES; NATURAL-WATERS; DENSITIES; CACL2; ELECTROLYTES; SYSTEM; MGCL2; NACL; MPA; NA-CA-CL-SO4-H2O AB Relative densities of CaCl2(aq) with 0.242 less than or equal to ml(mol-kg(-1)) less than or equal to 6.150 were measured with vibrating- tube densimeters between 25 and 250 degrees C and near 70 and 400 bars. Apparent molar volumes V-phi calculated from the measured density differences were represented with the Fitter ion-interaction treatment, with appropriate expressions chosen for the temperature and pressure dependence of the virial coefficients of the model. It was found that the partial molar volume at infinite dilution V-phi(O), and the second and third virial coefficients B-V and C-V, were necessary to represent V-phi near the estimated experimental uncertainty. The ionic-strength dependent beta((1)v) term in the B-V coefficient was included in the fit. The representation for V-phi has been integrated with respect to pressure to establish the pressure dependence of excess free energies over the temperature range studied. The volumetric data indicate that the logarithm of the mean ionic activity coefficient, In gamma(+/-)(CaCl2), increases by a maximum of 0.3 at 400 bars, 250 degrees C, and 6 mol-kg(-1) as compared with its value at saturation pressure. C1 VIRGINIA POLYTECH INST & STATE UNIV,DEPT GEOL SCI,BLACKSBURG,VA 24061. OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. RI Bodnar, Robert/A-1916-2009 NR 26 TC 27 Z9 27 U1 2 U2 7 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0095-9782 J9 J SOLUTION CHEM JI J. Solut. Chem. PD SEP PY 1995 VL 24 IS 9 BP 897 EP 916 DI 10.1007/BF00973444 PG 20 WC Chemistry, Physical SC Chemistry GA RX552 UT WOS:A1995RX55200003 ER PT J AU AESCHLIMAN, DP CROLL, RH KUNTZ, DW AF AESCHLIMAN, DP CROLL, RH KUNTZ, DW TI SHEAR-STRESS-SENSITIVE LIQUID-CRYSTALS FOR HYPERSONIC BOUNDARY-LAYER-TRANSITION DETECTION SO JOURNAL OF SPACECRAFT AND ROCKETS LA English DT Article AB The use of shear-stress-sensitive (SSS) liquid crystals (LCs) has been evaluated as a boundary-layer transition detection technique for hypersonic flows. Experiments were conducted at Mach 8 in the Sandia National Laboratories Hypersonic Wind Tunnel using a flat-plate model at near-0-deg angle of attack over the freestream unit-Reynolds-number range (1.2-5.8) x 10(6)/ft. Standard 35-mm color photography and Super VHS color video were used to record LC color changes due to varying surface shear stress during the transition process for a range of commercial SSS liquid crystals. Visual transition data mere compared with an established method using calorimetric surface heat-transfer measurements to evaluate the LC technique. It is concluded that the use of SSS LCs can be an inexpensive, safe, and easy-to-use boundary-layer transition detection method for hypersonic flows. However, a valid interpretation of the visual records requires careful attention to illumination intensity levels and uniformity and to lighting and viewing angles, some prior understanding of the general character of the flow, and the selection of the appropriate liquid crystal for the particular how conditions. RP AESCHLIMAN, DP (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 23 TC 2 Z9 2 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0022-4650 J9 J SPACECRAFT ROCKETS JI J. Spacecr. Rockets PD SEP-OCT PY 1995 VL 32 IS 5 BP 749 EP 757 DI 10.2514/3.26679 PG 9 WC Engineering, Aerospace SC Engineering GA TC857 UT WOS:A1995TC85700002 ER PT J AU FUNSTEN, HO MCCOMAS, DJ SCIME, EE AF FUNSTEN, HO MCCOMAS, DJ SCIME, EE TI LOW-ENERGY NEUTRAL-ATOM IMAGING TECHNIQUES FOR REMOTE OBSERVATIONS OF THE MAGNETOSPHERE SO JOURNAL OF SPACECRAFT AND ROCKETS LA English DT Article ID RING CURRENT AB Recent developments in the detection of neutral atoms mill enable construction of space-based imagers that may reveal the global structure and dynamics of the terrestrial magnetosphere. The principal technical challenge of imaging low-energy neutral atoms having energies <30 keV is separating them from the intense uv background, to which their detectors are sensitive, with minimal loss of trajectory and energy information. Three instrument concepts for separating low-energy neutral atoms from the background uv are discussed: neutral-atom ionization via transmission through an ultrathin carbon foil and subsequent electrostatic deflection, uv grating polarizers and attenuators, and high-frequency shutters. Hardware associated with each of these concepts is mated to a detector section that provides trajectory, coincidence, and, if required, time-of-flight measurements. RP FUNSTEN, HO (reprint author), LOS ALAMOS NATL LAB,SPACE & ATMOSPHER SCI GRP,LOS ALAMOS,NM 87545, USA. RI Funsten, Herbert/A-5702-2015 OI Funsten, Herbert/0000-0002-6817-1039 NR 22 TC 7 Z9 7 U1 0 U2 1 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0022-4650 J9 J SPACECRAFT ROCKETS JI J. Spacecr. Rockets PD SEP-OCT PY 1995 VL 32 IS 5 BP 899 EP 904 DI 10.2514/3.26703 PG 6 WC Engineering, Aerospace SC Engineering GA TC857 UT WOS:A1995TC85700026 ER PT J AU NOGALES, E WOLF, SG ZHANG, SX DOWNING, KH AF NOGALES, E WOLF, SG ZHANG, SX DOWNING, KH TI PRESERVATION OF 2-D CRYSTALS OF TUBULIN FOR ELECTRON CRYSTALLOGRAPHY SO JOURNAL OF STRUCTURAL BIOLOGY LA English DT Article; Proceedings Paper CT Workshop on Molecular Imaging of Cytoskeletal Protein Assembly CY APR 29-MAY 03, 1994 CL BAYLOR COLL MED, HOUSTON, TX HO BAYLOR COLL MED ID ZINC-INDUCED SHEETS; MICROTUBULE-ASSOCIATED PROTEINS; 3-DIMENSIONAL RECONSTRUCTION; GUANOSINE 5'-TRIPHOSPHATE; CRYOELECTRON MICROSCOPY; ASSEMBLY INVITRO; PROJECTION MAP; PORCINE BRAIN; TAXOL BINDS; RESOLUTION AB Zinc-induced sheets of tubulin are two dimensional crystalline polymers that constitute an ideal sample for high resolution studies of tubulin by electron crystallography. We show that these 2-dimensional tubulin crystals can be stabilized by taxol against low-temperature depolymerization and degradation with time, easing the way for the preparation of electron microscopy samples. The preservation of the crystals to high resolution has been tested with different embedding media. While glucose-embedded samples diffract poorly, samples embedded in tannin consistently diffract to a resolution of at least 3.5 Angstrom. Even better results are obtained by embedding with a combination of tannin and glucose, which improves the flatness of the crystals and allows the collection of isotropic high-resolution data from tilted specimens. (C) 1995 Academic Press, Inc. RP NOGALES, E (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720, USA. RI WOLF, SHARON/K-1768-2012 OI WOLF, SHARON/0000-0002-5337-5063 FU NIGMS NIH HHS [GM36884, GM46033] NR 58 TC 27 Z9 27 U1 0 U2 4 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 1047-8477 J9 J STRUCT BIOL JI J. Struct. Biol. PD SEP-OCT PY 1995 VL 115 IS 2 BP 199 EP 208 DI 10.1006/jsbi.1995.1044 PG 10 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA TB759 UT WOS:A1995TB75900009 PM 7577240 ER PT J AU DellOrco, P Eaton, H Reynolds, T Buelow, S AF DellOrco, P Eaton, H Reynolds, T Buelow, S TI The solubility of 1:1 nitrate electrolytes in supercritical water SO JOURNAL OF SUPERCRITICAL FLUIDS LA English DT Article DE solubility; sodium; lithium; potassium; nitrate; supercritical water ID VAPOR-LIQUID; OXIDATION; TEMPERATURE; NACL-H2O; SYSTEM AB A novel method was developed for determining the solubility of sodium nitrate in water solutions at pressures ranging from 248 to 300 bar and temperatures from 450 to 525 degrees C. Sodium nitrate solubilities determined by this method ranged from 293 mg kg(-1) at 248 bar and 525 degrees C to 1963 mg kg(-1) at 300 bar and 450 degrees C. A simple hydration mechanism was used to model the data. In addition, solubilities were determined for potassium and lithium nitrate salts to assess the effect of ion size on solubility. These experiments determined that the solubility was proportional to the ion size, so that solubility decreased in the order LiNO3 > NaNO3 > KNO3. These studies were motivated by applications for sodium nitrate in hydrothermal treatment methods, especially supercritical-water oxidation. C1 UNIV TEXAS,AUSTIN,TX 78712. FURMAN UNIV,DEPT CHEM,GREENVILLE,SC 29613. RP DellOrco, P (reprint author), LOS ALAMOS NATL LAB,MS C920,DX-16,LOS ALAMOS,NM 87545, USA. NR 22 TC 24 Z9 24 U1 0 U2 3 PU PRA PRESS PI CINCINNATI PA POLYMER RES ASSOC INC 9200 MONTGOMERY RD, SUITE 23B, CINCINNATI, OH 45242 SN 0896-8446 J9 J SUPERCRIT FLUID JI J. Supercrit. Fluids PD SEP PY 1995 VL 8 IS 3 BP 217 EP 227 DI 10.1016/0896-8446(95)90034-9 PG 11 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA TM185 UT WOS:A1995TM18500003 ER PT J AU Yonker, CR Wallen, SL Linehan, JC AF Yonker, CR Wallen, SL Linehan, JC TI High-pressure NMR study of metal complexes in supercritical fluids SO JOURNAL OF SUPERCRITICAL FLUIDS LA English DT Article DE high-pressure NMR; metal complexes; supercritical fluids ID FLUORESCENCE SPECTROSCOPY; SELF-DIFFUSION; EXTRACTION AB Results of high-pressure NMR investigations of subcritical and supercritical-fluid solutions of metal complexes in ethylene and CO2 are presented. To our knowledge, this is the first report of high-pressure NMR studies of metal chelates in supercritical fluids. Examples presented include F-19 NMR studies of two beta-diketone metal chelates dissolved in subcritical CO2-methanol mixtures and a H-1 NMR study of the (1,5-cyclooctadiene) dimethylplatinum (II) (Pt-COD) complex in supercritical ethylene. High-pressure NMR chemical shifts as a function of density for supercritical ethylene are also presented. The results show the utility of the NMR technique to study a variety of metal complexes in subcritical and supercritical fluids. RP Yonker, CR (reprint author), PACIFIC NW LAB, DEPT CHEM SCI, RICHLAND, WA 99352 USA. NR 19 TC 12 Z9 12 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0896-8446 EI 1872-8162 J9 J SUPERCRIT FLUID JI J. Supercrit. Fluids PD SEP PY 1995 VL 8 IS 3 BP 250 EP 254 DI 10.1016/0896-8446(95)90037-3 PG 5 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA TM185 UT WOS:A1995TM18500006 ER PT J AU LAIRD, G AF LAIRD, G TI REPETITIVE-BLOW AND SINGLE-BLOW IMPACT TESTING OF WEAR-RESISTANT ALLOYS SO JOURNAL OF TESTING AND EVALUATION LA English DT Article DE WEAR; IMPACT; TOUGHNESS; WHITE CAST IRONS; WEAR-RESISTANT ALLOYS; FRACTURE ID CAST-IRON; ABRASION AB Repetitive-impact and impact toughness tests provide two distinct measures of a material's ability to resist impact-related wear phenomena. These tests are described in detail and results are presented for a variety of cast and forged wear-resistant alloys. In particular, past research at the U.S. Bureau of Mines using the ball-on-block and bah-on-ball repetitive-impact test is reviewed and the wear-related phenomena associated with repetitive impact are described. Impact toughness was measured using a modified dynamic tear test. To account for the heterogeneous and brittle nature of many wear-resistant alloys, a new tear test specimen was developed. Impact energies are presented for a variety of cast alloys and compared against literature values for static and dynamic fracture toughness of similar alloys. It is shown that repetitive-impact and single-blow impact tests allow a unique characterization of the material's behavior to crack initiation and propagation that dominate many wear environments. RP US BUR MINES, ALBANY RES CTR, ALBANY, OR 97321 USA. NR 51 TC 1 Z9 1 U1 0 U2 0 PU AMER SOC TESTING MATERIALS PI W CONSHOHOCKEN PA 100 BARR HARBOR DR, W CONSHOHOCKEN, PA 19428-2959 USA SN 0090-3973 EI 1945-7553 J9 J TEST EVAL JI J. Test. Eval. PD SEP PY 1995 VL 23 IS 5 BP 333 EP 340 PG 8 WC Materials Science, Characterization & Testing SC Materials Science GA RU628 UT WOS:A1995RU62800002 ER PT J AU CANDY, JV SULLIVAN, EJ AF CANDY, JV SULLIVAN, EJ TI MODEL-BASED ENVIRONMENTAL INVERSION - A SHALLOW-WATER OCEAN APPLICATION SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SOURCE LOCALIZATION; VERTICAL ARRAY AB A model-based approach to invert or estimate the sound-speed profile (SSP) from noisy pressure-field measurements or more succinctly a solution to the model-based inversion problem is discussed. Recall that model-based signal processing is a well-defined methodology enabling the inclusion of environmental (propagation) models, measurement (sensor arrays) models and noise (shipping, measurement) models into sophisticated processing algorithms. Here the design of a model-based processor (MBP) is investigated based on a Taylor series expansion of the SSP about the most current set of parameter estimates augmented into the state-space representation of a normal-mode propagation model to solve the environmental inversion problem. The resulting processor is adaptive in terms of simultaneously estimating the sound speed, modes, and pressure field at each iteration. Using data obtained from from the well-known Hudson Canyon experiment, a noisy shallow water ocean environment, the processor is designed and the results compared to those predicted using various propagation models and data. It is shown that the on-line, MBP not only predicts the sound speed quite well, but also is able to simultaneously provide enhanced estimates of both modal and pressure-held measurements which are useful for localization and rapid ocean environmental characterization. (C) 1995 Acoustical Society of America. C1 USN,CTR UNDERSEA WARFARE,NEWPORT,RI 02841. RP CANDY, JV (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-495,LIVERMORE,CA 94550, USA. NR 23 TC 9 Z9 13 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1995 VL 98 IS 3 BP 1446 EP 1454 DI 10.1121/1.413411 PG 9 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA RT915 UT WOS:A1995RT91500017 ER PT J AU CANDY, JV SULLIVAN, EJ AF CANDY, JV SULLIVAN, EJ TI PASSIVE LOCALIZATION IN OCEAN ACOUSTICS - A MODEL-BASED APPROACH SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SHALLOW-WATER; DEPTH ESTIMATION; VERTICAL ARRAY; TOWED ARRAY; INFORMATION; FILTER; RANGE AB A model-based approach is developed to solve the passive localization problem in ocean acoustics using the state-space formulation for the first time. It is shown that the inherent structure of the resulting processor consists of a parameter estimator coupled to a nonlinear optimization scheme. The parameter estimator is designed using the model-based approach in which an ocean acoustic propagation model is used in developing the model-based processor required for localization. Recall that model-based signal processing is a well-defined methodology enabling the inclusion of environmental (propagation) models, measurement (sensor arrays) models, and noise (shipping, measurement) models into a sophisticated processing algorithm. Here the parameter estimator is designed, or more appropriately the model-based identifier (MBID) for a propagation model developed from a shallow water ocean experiment. After simulation, it is then applied to a set of experimental data demonstrating the applicability of this approach. (C) 1995 Acoustical Society of America. C1 USN,CTR UNDERSEA WARFARE,NEWPORT,RI 02841. RP CANDY, JV (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-495,LIVERMORE,CA 94550, USA. NR 47 TC 22 Z9 24 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1995 VL 98 IS 3 BP 1455 EP 1471 DI 10.1121/1.413412 PG 17 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA RT915 UT WOS:A1995RT91500018 ER PT J AU COLLINS, MD FISHMAN, L AF COLLINS, MD FISHMAN, L TI EFFICIENT NAVIGATION OF PARAMETER LANDSCAPES SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID OPTIMIZATION; TEMPERATURE; INVERSION; OCEAN AB Optimization techniques can have difficulty navigating long valleys that are oriented obliquely to the parameter axes. Efficiency may be improved by rotating coordinates so that the most prominent valleys are optimally aligned with the parameter axes. The rotated axes are parallel to the eigenvectors of the covariance matrix of the gradient of the cost function, which may be estimated efficiently by Monte Carlo integration. The information in the covariance matrix may also be used to obtain an improved parametrization, which corresponds to the rotated coordinates associated with the largest eigenvalues. The approach is illustrated for the inverse problem of estimating ocean bottom parameters from acoustic data using simulated annealing. For multifrequency inverse problems, the resolution for each frequency is optimized. (C) 1995 Acoustical Society of America. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP COLLINS, MD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 23 TC 56 Z9 56 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1995 VL 98 IS 3 BP 1637 EP 1644 DI 10.1121/1.413430 PG 8 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA RT915 UT WOS:A1995RT91500037 ER PT J AU PARANTHAMAN, M BEACH, DB AF PARANTHAMAN, M BEACH, DB TI GROWTH OF HIGHLY ORIENTED TLBA2CA2CU3O9-Y SUPERCONDUCTING FILMS ON AG SUBSTRATES USING A DIP-COATED BARIUM CALCIUM COPPER-OXIDE SOL-GEL PRECURSOR SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note ID THIN-FILMS AB Thin films of Ba2Ca2Cu3O7, a precursor of TlBa2Ca2-Cu3O9-y, were prepared by set-gel synthesis from an all-alkoxide solution. The barium and calcium precursors were the respective metals reacted with 2-methoxyethanol, and the copper precursor was copper methoxide complexed by triethanolamine. Silver substrates were coated using the sol-gel solution by dip-coating. Subsequent processing included a low-temperature drying step (600 degrees C), repeated coating to provide the desired thickness, heat treatment at 850 degrees C in oxygen to remove carbon, and reaction at 860 degrees C in a two-zone thallination furnace to produce a TlBa2Ca2-Cu3O9-y superconducting film. These films were strongly c-axis-aligned, had a zero-resistance temperature (T-c) of 110 K, and a critical-current density (J(c)) of 1.9 x 10(4) A/cm(2) at 77 K and zero magnetic field. RP PARANTHAMAN, M (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831, USA. RI Paranthaman, Mariappan/N-3866-2015 OI Paranthaman, Mariappan/0000-0003-3009-8531 NR 11 TC 12 Z9 12 U1 0 U2 0 PU AMER CERAMIC SOC 735 CERAMIC PLACE PI WESTERVILLE PA PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD SEP PY 1995 VL 78 IS 9 BP 2551 EP 2553 DI 10.1111/j.1151-2916.1995.tb08701.x PG 3 WC Materials Science, Ceramics SC Materials Science GA TJ790 UT WOS:A1995TJ79000042 ER PT J AU GRABER, ML SHREEVE, W MA, R PIERSON, RN AF GRABER, ML SHREEVE, W MA, R PIERSON, RN TI DIABETIC HYPERKALEMIA - BODY-COMPOSITION ANALYSIS SO JOURNAL OF THE AMERICAN SOCIETY OF NEPHROLOGY LA English DT Meeting Abstract C1 VET AFFAIRS MED CTR,NORTHPORT,NY. BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 1046-6673 J9 J AM SOC NEPHROL JI J. Am. Soc. Nephrol. PD SEP PY 1995 VL 6 IS 3 SI SI BP 439 EP 439 PG 1 WC Urology & Nephrology SC Urology & Nephrology GA RX686 UT WOS:A1995RX68600548 ER PT J AU AVNER, ED SWEENEY, WE WOYCHIK, RP AF AVNER, ED SWEENEY, WE WOYCHIK, RP TI INHIBITION OF EPIDERMAL GROWTH-FACTOR RECEPTOR (EFFR) ACTIVITY MODULATES COLLECTING TUBULE (CT) CYSTOGENESIS IN-VITRO SO JOURNAL OF THE AMERICAN SOCIETY OF NEPHROLOGY LA English DT Meeting Abstract C1 CASE WESTERN RESERVE UNIV,CLEVELAND,OH 44106. OAK RIDGE NATL LAB,OAK RIDGE,TN. NR 1 TC 3 Z9 3 U1 0 U2 1 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 1046-6673 J9 J AM SOC NEPHROL JI J. Am. Soc. Nephrol. PD SEP PY 1995 VL 6 IS 3 SI SI BP 690 EP 690 PG 1 WC Urology & Nephrology SC Urology & Nephrology GA RX686 UT WOS:A1995RX68601550 ER PT J AU NOIRI, E SOM, P OSTER, ZH RHODES, BA WANG, GJ CABAHUG, C GOLIGORSKY, MS AF NOIRI, E SOM, P OSTER, ZH RHODES, BA WANG, GJ CABAHUG, C GOLIGORSKY, MS TI METABOLIC AND RENAL CLEARANCE OF TECHNETIUM-LABELED ARG-GLY-ASP (TC-99M-RGD) IN ACUTE-RENAL-FAILURE (ARF) SO JOURNAL OF THE AMERICAN SOCIETY OF NEPHROLOGY LA English DT Meeting Abstract C1 SUNY STONY BROOK,STONY BROOK,NY 11794. BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 1 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 1046-6673 J9 J AM SOC NEPHROL JI J. Am. Soc. Nephrol. PD SEP PY 1995 VL 6 IS 3 SI SI BP 986 EP 986 PG 1 WC Urology & Nephrology SC Urology & Nephrology GA RX686 UT WOS:A1995RX68602730 ER PT J AU ZHONG, SY DORAN, JC AF ZHONG, SY DORAN, JC TI A MODELING STUDY OF THE EFFECTS OF INHOMOGENEOUS SURFACE FLUXES ON BOUNDARY-LAYER PROPERTIES SO JOURNAL OF THE ATMOSPHERIC SCIENCES LA English DT Article ID MESOSCALE CIRCULATIONS; HAPEX-MOBILHY; VARIABILITY; SIMULATION AB A numerical modeling study was conducted to examine the response of the atmospheric boundary layer to inhomogeneous surface fluxes. The study was used to extend the results obtained from a field experiment carried out in spring 1992 in north-central Oregon over a region characterized by warm, dry sagebrush and grassland steppe and cooler, irrigated farmland. Characteristic scales of the two prominent land-use types were an the order of 10 km or more. A series of numerical experiments were carried out to analyze boundary-layer behavior on three days selected for derailed study, to perform a set of sensitivity tests to identify the principal mechanisms responsible for secondary circulations in the region, and, with selected two-dimensional simulations, to verify the role of advection in maintaining well-mixed layers over cool surfaces. Although contrasts in land use produce measurable secondary circulations over the study area, terrain effects and ambient winds can mask much of the response to the differential heating over the warm and cool regions. The depth of the mixed layer is poorly correlated with the local underlying surface heat fluxes but is governed instead by a combination of local fluxes, horizontal advection, convergence or divergence, and shear production of turbulence. An analysis of mesoscale heat fluxes, that is, the fluxes associated with secondary circulations that would not be resolved by a coarse resolution model, shows that the contribution, arising from land-use differences, to the domain-averaged atmospheric heating rate is small for this area. The authors suggest that modeling studies based on idealized terrain and land-use configurations may tend to overestimate the effect of mesoscale fluxes on the temperature structure predicted by coarse-resolution models applied to real world conditions. Even so, secondary circulations may be significant for other boundary-layer properties, such as mixed-layer depth and cloud formation. C1 PACIFIC NW LAB, DEPT ATMOSPHER SCI, RICHLAND, WA 99352 USA. NR 25 TC 22 Z9 23 U1 1 U2 2 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0022-4928 J9 J ATMOS SCI JI J. Atmos. Sci. PD SEP 1 PY 1995 VL 52 IS 17 BP 3129 EP 3142 DI 10.1175/1520-0469(1995)052<3129:AMSOTE>2.0.CO;2 PG 14 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA RR005 UT WOS:A1995RR00500005 ER PT J AU CHIN, HNS FU, Q BRADLEY, MM MOLENKAMP, CR AF CHIN, HNS FU, Q BRADLEY, MM MOLENKAMP, CR TI MODELING OF A TROPICAL SQUALL LINE IN 2 DIMENSIONS - SENSITIVITY TO RADIATION AND COMPARISON WITH A MIDLATITUDE CASE SO JOURNAL OF THE ATMOSPHERIC SCIENCES LA English DT Article ID MESOSCALE CONVECTIVE SYSTEM; CUMULUS ENSEMBLE MODEL; CIRRUS CLOUDS; NUMERICAL-SIMULATION; LONGWAVE RADIATION; OPTICAL-PROPERTIES; STRATIFORM REGION; EASTERN ATLANTIC; CLIMATE MODEL; ICE CRYSTALS AB A two-dimensional cloud model is used to study a tropical oceanic squall-line system. The dynamical and microphysical structures of the simulated squall-line system and the impact of environmental wind profiles on these structures are presented. The influence of the microphysics treatment on cloud radiative properties and the sensitivity of this simulated system to radiation is also investigated. In addition, partitioned heat, moisture and water budgets, and two radiative transfer schemes are used to assess the role of anvil clouds on the simulated system and on the assumption used in a bulk parameterization for cloud radiative properties. The comparison with a midlatitude study is also made to show its climatic implication. The major conclusions are as follows. 1) The simulated tropical squall-line system replicates many observed features. A transition zone in the simulated multicellular storm is primarily caused by the jetlike wind profile, while it is due to longwave radiation in the midlatitude system. 2) The effect of a jetlike wind profile is to weaken/strengthen the convective/anvil portion of the simulated system, which leads to an overall decrease of total surface precipitation by 17%. 3) The moisture budgets indicate that tropical deep convection serves as a more efficient engine, pumping low-level moisture upward to form the upper-level anvil cloud, than its midlatitude counterpart although the convective instability is lower in the tropical environment. 4) Microphysical production is the primary source of the water budget (similar to 3/5) in the simulated tropical anvil, and the rest (similar to 2/5) is contributed by horizontal transport of hydrometeors from deep convection. This is just the reverse of the midlatitude case. 5) The simulated tropical oceanic anvil has a stronger shortwave radiative forcing than the midlatitude continental anvil, although they have comparable longwave forcings. 6) The small difference in total precipitation of the simulated system caused by different radiation transfer schemes appears to justify the assumption of using a bulk parameterization for cloud radiative properties. 7) Comparisons of water budgets and cloud radiative properties between simulated tropical and midlatitude anvils suggest the need to parameterize the tilting structure of mesoscale convective systems for improving the representation of cloud processes in general circulation models. C1 UNIV UTAH, DEPT METEOROL, SALT LAKE CITY, UT 84112 USA. RP CHIN, HNS (reprint author), LAWRENCE LIVERMORE NATL LAB, DIV GLOBAL CLIN RES, POB 808, L-262, LIVERMORE, CA 94551 USA. NR 81 TC 17 Z9 19 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 USA SN 0022-4928 J9 J ATMOS SCI JI J. Atmos. Sci. PD SEP 1 PY 1995 VL 52 IS 17 BP 3172 EP 3193 DI 10.1175/1520-0469(1995)052<3172:MOATSL>2.0.CO;2 PG 22 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA RR005 UT WOS:A1995RR00500008 ER PT J AU BATES, JB LUBBEN, D DUDNEY, NJ HART, FX AF BATES, JB LUBBEN, D DUDNEY, NJ HART, FX TI 5 VOLT PLATEAU IN LIMN2O4 THIN-FILMS SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Letter ID MANGANESE AB A plateau with a median voltage of similar to 5 V, possibly due to Li+ ions occupying octahedral sites in the spinel structure, has been observed on charging crystalline spinel LiMn2O4 thin-film cathodes to 5.3 V. The total charge extracted from the 4 and 5 V plateaus corresponds to 1 Li/Mn2O4, but the distribution of capacity between the two plateaus varies from film to film. After charging to 5.3 V, the cathodes were irreversibly changed: the capacity of the 4 V plateau increased by as much as 50%, but the cell resistance also increased significantly due to degradation of the cathode. C1 UNIV SOUTH,DEPT PHYS,SEWANEE,TN 37375. RP BATES, JB (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37831, USA. RI Dudney, Nancy/I-6361-2016 OI Dudney, Nancy/0000-0001-7729-6178 NR 5 TC 54 Z9 55 U1 0 U2 14 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD SEP PY 1995 VL 142 IS 9 BP L149 EP L151 DI 10.1149/1.2048729 PG 3 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA RV179 UT WOS:A1995RV17900005 ER PT J AU FLEMISH, JR XIE, K DU, H WITHROW, SP AF FLEMISH, JR XIE, K DU, H WITHROW, SP TI ION-IMPLANTATION AND ACTIVATION OF ALUMINUM IN 6H-SIC SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Letter ID SILICON-CARBIDE; NITROGEN; DIODES; BORON AB Ion implantation of large doses (> 10(15)/cm(2)) or Al into SIC is known to produce excessive damage which cannot be readily eliminated by thermal annealing. We have demonstrated electrical activation of ion-implanted Al in 6H-SiC, using a relatively low total ion dose (2.9 x 10(14)/cm(2)) implanted at three energies (65, 135, and 220 keV) into a 2 mu m epitaxial layer with a background p-type doping level of 1 x 10(18)/cm(3). The implanted samples were annealed at temperatures from 1300 to 1500 degrees C using a proximity annealing method to retard the decomposition of the SiC surface at high temperatures. Upon annealing at 1450 degrees C the sheet resistance of the implanted layer was reduced by approximately a factor of four relative to the same p-type layer which was not implanted. C1 STEVENS INST TECHNOL,DEPT MAT SCI & ENGN,HOBOKEN,NJ 07030. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP FLEMISH, JR (reprint author), USA,RES LAB,ELECTR & POWER SOURCES DIRECTORATE,FT MONMOUTH,NJ 07703, USA. NR 14 TC 4 Z9 4 U1 0 U2 1 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD SEP PY 1995 VL 142 IS 9 BP L144 EP L146 DI 10.1149/1.2048727 PG 3 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA RV179 UT WOS:A1995RV17900003 ER PT J AU MULHOLLAND, PJ MARZOLF, ER HENDRICKS, SP WILKERSON, RV BAYBAYAN, AK AF MULHOLLAND, PJ MARZOLF, ER HENDRICKS, SP WILKERSON, RV BAYBAYAN, AK TI LONGITUDINAL PATTERNS OF NUTRIENT CYCLING AND PERIPHYTON CHARACTERISTICS IN STREAMS - A TEST OF UPSTREAM-DOWNSTREAM LINKAGE SO JOURNAL OF THE NORTH AMERICAN BENTHOLOGICAL SOCIETY LA English DT Article DE PERIPHYTON; WHOLE-STREAM METABOLISM; NUTRIENT CYCLING; BIOMASS NUTRIENT STOICHIOMETRY; LONGITUDINAL LINKAGES; LABORATORY STREAMS AB We studied trends in nutrient cycling and periphyton characteristics (biomass, species composition, productivity, and nutrient content) along longitudinal gradients in laboratory streams to test the hypothesis that upstream-downstream linkages produce distinct longitudinal patterns in stream ecosystems. Periphyton communities were grown under uniform light and now conditions in two 88-m-long laboratory streams created by connecting four channel segments (each 0.3 m wide and 22 m long) in series. At the end of 8 wk, large longitudinal declines in streamwater N and P concentrations were observed in each stream. Although chlorophyll a declined and the proportion of cyanobacteria in the periphyton increased with distance downstream, longitudinal trends in ash-free dry mass, gross primary productivity (GPP), and total respiration were not significant. In contrast, longitudinal trends in most of the parameters related to nutrient deficiency and cycling were significant. Chlorophyll-specific phosphatase activity and C:nutrient ratios in periphyton biomass increased from upstream to downstream, suggesting greater nutrient deficiency downstream. Ratios of net N uptake rate:GPP and net P uptake rate:GPP declined from upstream to downstream, suggesting that nutrient recycling supported a greater fraction of the algal nutrient demand downstream. Ratios of net:total P uptake rate also declined from upstream to downstream suggesting that a larger fraction of the total P uptake from stream water downstream was met by P recycled within the segment rather than by inputs from upstream. Within-segment recycling supplied only 10-25% of P uptake from stream water in upstream segments but contributed 60-70% of the P uptake from stream water in downstream segments. Finally, total P uptake rate:GPP ratio declined from upstream to downstream, suggesting that cycling of P within the periphyton mat was greater downstream than upstream. Together, our results showed that increased nutrient cycling can compensate for longitudinal declines in nutrient concentrations in stream water, preventing large longitudinal changes in periphyton biomass and productivity. Nutrient cycling and algal species composition were the characteristics showing strongest longitudinal linkage in these periphyton-dominated streams, whereas total biomass and productivity patterns were poorly related to longitudinal position. RP MULHOLLAND, PJ (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. RI Mulholland, Patrick/C-3142-2012 NR 0 TC 38 Z9 39 U1 2 U2 11 PU NORTH AMER BENTHOLOGICAL SOC PI LAWRENCE PA 1041 NEW HAMSPHIRE STREET, LAWRENCE, KS 66044 SN 0887-3593 J9 J N AM BENTHOL SOC JI J. North American Benthol. Soc. PD SEP PY 1995 VL 14 IS 3 BP 357 EP 370 DI 10.2307/1467202 PG 14 WC Ecology; Marine & Freshwater Biology SC Environmental Sciences & Ecology; Marine & Freshwater Biology GA RR969 UT WOS:A1995RR96900001 ER PT J AU YOCKY, DA AF YOCKY, DA TI IMAGE MERGING AND DATA FUSION BY MEANS OF THE DISCRETE 2-DIMENSIONAL WAVELET TRANSFORM SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article ID ENHANCEMENT AB A new technique is developed for the merging and data fusion of two images. Two spatially registered images with differing spatial resolutions and color content are merged by combining multiresolution wavelet-decomposition components from each and then reconstructing the merged image by means of the inverse wavelet transform. The wavelet merger can employ a variety of wavelet bases, but in presentation of the concept, simple orthonormal sets-Haar and Daubechies wavelets-are explored. The wavelet technique is compared with the intensity-hue-saturation merging technique by means of multispectral and panchromatic test images. The results of the comparison show the wavelet merger performing better in combining and preserving spectral-spatial information for the test images. RP YOCKY, DA (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. RI Pan, Chong/B-2996-2012 NR 19 TC 160 Z9 207 U1 2 U2 16 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3232 J9 J OPT SOC AM A JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD SEP PY 1995 VL 12 IS 9 BP 1834 EP 1841 DI 10.1364/JOSAA.12.001834 PG 8 WC Optics SC Optics GA RR754 UT WOS:A1995RR75400002 ER PT J AU DANEHY, PM PAUL, PH FARROW, RL AF DANEHY, PM PAUL, PH FARROW, RL TI THERMAL-GRATING CONTRIBUTIONS TO DEGENERATE 4-WAVE-MIXING IN NITRIC-OXIDE SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID LASER-INDUCED GRATINGS; FREE JETS; NO; TEMPERATURE; FLAME; SPECTROSCOPY; DEPENDENCE; ABSORPTION; DYNAMICS; NITROGEN AB We report investigations of degenerate four-wave mixing (DFWM) line intensities in the A(2) Sigma(+) <-- X(2)II electronic transitions of nitric oxide. Contributions from population gratings (spatially varying perturbations in the level populations of absorbing species) and thermal gratings (spatially varying perturbations in the overall density) were distinguished and compared by several experimental and analytical techniques. For small quantities of nitric oxide in a strongly quenching buffer gas (carbon dioxide), we found that thermal-grating contributions dominated at room temperature for gas pressures of approximate to 0.5 atm and higher. In a nearly nonquenching buffer (nitrogen) the population-grating mechanism dominated at pressures of approximate to 1.0 atm and lower. At higher temperatures in an atmospheric-pressure methane/air flame, population gratings of nitric oxide also dominated. We propose a simple model for the ratio of thermal- to population-grating scattering intensities that varies as (PT-4.4)-T-4. Preliminary investigations of the temperature dependence and detailed studies of the pressure dependence are in agreement with this model. Measurements of the temporal evolution and the peak intensity of isolated thermal-grating signals are in detailed agreement with calculations based on a linearized hydrodynamic model [J. Opt. Sec. Am. B 12, 384 (1995)]. C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551. RP DANEHY, PM (reprint author), STANFORD UNIV,HIGH TEMP GASDYNAM LAB,STANFORD,CA 94305, USA. NR 44 TC 43 Z9 43 U1 0 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD SEP PY 1995 VL 12 IS 9 BP 1564 EP 1576 DI 10.1364/JOSAB.12.001564 PG 13 WC Optics SC Optics GA RU396 UT WOS:A1995RU39600005 ER PT J AU HOLTOM, GR CROWELL, RA XIE, XS AF HOLTOM, GR CROWELL, RA XIE, XS TI HIGH-REPETITION-RATE FEMTOSECOND OPTICAL PARAMETRIC OSCILLATOR AMPLIFIER SYSTEM NEAR 3 MU-M SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID TI-SAPPHIRE LASER; PICOSECOND PULSES; LITHIUM TRIBORATE; INFRARED PULSES; GENERATION; AMPLIFICATION; KTIOPO4; SPECTROSCOPY; LIGHT AB An ultrafast laser system for the chemically important 3-mu m spectral region has been constructed by means of noncritically phased-matched KTiOPO4 optical parametric gain elements. An optical parametric oscillator, synchronously pumped by a mode-locked Ti:sapphire oscillator, generates high-quality seed pulses for an optical parametric amplifier. The optical parametric amplifier, pumped by a high-repetition-rate Ti:sapphire regenerative amplifier, amplifies the seed pulses by a factor of 520. Pulses with an energy of 550 nJ and a pulse width of 160 fs are produced at a 250-kHz repetition rate in the 3-mu m region. RP HOLTOM, GR (reprint author), PACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, POB 999 MAIL STOP K2-14, RICHLAND, WA 99352 USA. NR 47 TC 25 Z9 27 U1 1 U2 4 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD SEP PY 1995 VL 12 IS 9 BP 1723 EP 1731 DI 10.1364/JOSAB.12.001723 PG 9 WC Optics SC Optics GA RU396 UT WOS:A1995RU39600025 ER PT J AU SORDELET, DJ KRAMER, MJ UNAL, O AF SORDELET, DJ KRAMER, MJ UNAL, O TI EFFECT OF STARTING POWDERS ON THE CONTROL OF MICROSTRUCTURAL DEVELOPMENT OF AL-CU-FE QUASI-CRYSTALLINE PLASMA-SPRAYED COATINGS SO JOURNAL OF THERMAL SPRAY TECHNOLOGY LA English DT Article DE AL-CU-FE ALLOYS; PLASMA SPRAYING; QUASI-CRYSTALS AB Powders and plasma-sprayed coatings of an Al63Cu25Fe12 alloy containing a quasi-crystalline phase were characterized by X-ray diffraction, electron microscopy, and differential thermal analysis. The relationships between powder and coating microstructures were examined. Powders were produced by casting and crushing and by gas atomization. Both techniques produced powders with multiple phases; cubic and monoclinic ternary structures were formed along with the face-centered icosahedral quasi-crystalline phase. These phases were also produced in the plasma-are-sprayed coatings formed using different starting powders. Cooling rates during powder processing greatly affected the phase equilibria and scale of segregation of this alloy. Finer grain sizes in the plasma-sprayed coatings were obtained from the more chemically homogeneous gas-atomized powders. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 11 TC 34 Z9 35 U1 0 U2 1 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 SN 1059-9630 J9 J THERM SPRAY TECHN JI J. Therm. Spray Technol. PD SEP PY 1995 VL 4 IS 3 BP 235 EP 244 DI 10.1007/BF02646966 PG 10 WC Materials Science, Coatings & Films SC Materials Science GA RZ552 UT WOS:A1995RZ55200003 ER PT J AU STEVENS, JE SOWA, MJ CECCHI, JL AF STEVENS, JE SOWA, MJ CECCHI, JL TI HELICON PLASMA SOURCE EXCITED BY A FLAT SPIRAL COIL SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 41st National Symposium of the American-Vacuum-Society CY OCT 24-28, 1994 CL DENVER, CO SP Amer Vacuum Soc ID CYCLOTRON RESONANCE DISCHARGE; ELECTRON AB We have characterized a new helicon plasma source with an end-launch antenna configuration. Power at 13.56 MHz is coupled via a four-turn flat spiral coil into an m = 0 helicon mode with the application of a weak (B > 5 G) axial magnetic field. Plasma parameters were measured with Langmuir probes, and the structure and absorption of the helicon wave fields were determined with magnetic induction probes. Plasma densities of 10(11)-10(12) cm(-3) were produced in argon for pressures in the 1-100 mTorr range with a 5-60 G magnetic field. Radio frequency power absorption occurs primarily via collisionless Landau damping for pressures below 5-10 mTorr and collisional damping dominates at higher pressures. Single pass absorption occurs for magnetic fields less than 20 G. This source does not require a separate source chamber, and thus combines the compactness of flat coil inductively coupled sources with the advantages of remote plasma generation found in wave supported sources. The source can be easily optimized for a variety of operating conditions, because the helicon parallel wavelength is not constrained. (C) 1995 American Vacuum Society. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. UNIV NEW MEXICO,DEPT CHEM & NUCL ENGN,ALBUQUERQUE,NM 87131. NR 25 TC 49 Z9 51 U1 2 U2 9 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD SEP-OCT PY 1995 VL 13 IS 5 BP 2476 EP 2482 DI 10.1116/1.579491 PG 7 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA RV828 UT WOS:A1995RV82800026 ER PT J AU TAO, HS DIEBOLD, U CHAKARIAN, V SHUH, DK YARMOFF, JA SHINN, ND MADEY, TE AF TAO, HS DIEBOLD, U CHAKARIAN, V SHUH, DK YARMOFF, JA SHINN, ND MADEY, TE TI RADIATION-INDUCED DECOMPOSITION OF PF3 ON RU(0001) SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article ID ELECTRON-STIMULATED-DESORPTION; NEGATIVE-IONS; CHEMISTRY; SURFACES AB Soft x-ray photoelectron spectroscopy using synchrotron radiation has been employed to study the decomposition of PF3 on Ru(0001) at 80 K induced by energetic electrons. Due to the large binding energy shifts in the P 2p core levels, the phosphorus-containing surface intermediates produced from the electron-induced decomposition of PF3 can be identified and their evolution can be followed as the fluence of electrons is changed. A stepwise decomposition of PF3, induced by energetic electrons, i.e., PF3 --> PF2 --> PF --> P, is observed. The dissociation cross section for PF3 --> PF2 induced by 550 eV electrons is measured to be on the order of similar to 1 X 10(-16) cm(2). The main channels that lead to PF3 dissociation involve the excitation of F 2s as well as valence states of PF3. (C) 1995 American Vacuum Society. C1 RUTGERS STATE UNIV,DEPT PHYS & ASTRON,PISCATAWAY,NJ 08855. RUTGERS STATE UNIV,SURFACE MODIFICAT LAB,PISCATAWAY,NJ 08855. TULANE UNIV,DEPT PHYS,NEW ORLEANS,LA 70118. UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RI Diebold, Ulrike/A-3681-2010 OI Diebold, Ulrike/0000-0003-0319-5256 NR 16 TC 5 Z9 5 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD SEP-OCT PY 1995 VL 13 IS 5 BP 2553 EP 2557 DI 10.1116/1.579502 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA RV828 UT WOS:A1995RV82800037 ER PT J AU SCHROENCAREY, D OVERTURF, GE REIBOLD, R BUCKLEY, SR LETTS, SA COOK, R AF SCHROENCAREY, D OVERTURF, GE REIBOLD, R BUCKLEY, SR LETTS, SA COOK, R TI HOLLOW FOAM MICROSHELLS FOR LIQUID-LAYERED CRYOGENIC INERTIAL CONFINEMENT FUSION-TARGETS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 41st National Symposium of the American-Vacuum-Society CY OCT 24-28, 1994 CL DENVER, CO SP Amer Vacuum Soc ID TRIMETHYLOLPROPANE TRIMETHACRYLATE; MACROPOROUS GELS; POLYMERIZATION; TOLUENE; SHELLS AB Future U.S. inertial confinement fusion (ICF) targets will use capsules, 1-2 mm in diameter, with uniform 100 mu m thick, cryogenic fuel layers. Research is currently underway to identify optimal methods for producing these thick, uniform layers. One method is to use a spherical polymer foam layer within a full density polymer overcoat to support the fuel. Targets of this type, 0.4-0.8 mm in diameter, with 10-30 mu m walls, have been developed by the Institute of Laser Engineering at Osaka University, Japan. Reported here are the results obtained from work to extend the method to the future ICF target design. Overcoated foam shells of the proper dimensions were produced, but their optical properties precluded the use of current diagnostics to determine the amount and uniformity of the fuel fill. Briefly outlined are options for improving the optical properties. (C) 1995 American Vacuum Society. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA. RP SCHROENCAREY, D (reprint author), WJ SCHAFER ASSOCIATES INC,LIVERMORE,CA 94550, USA. NR 21 TC 12 Z9 14 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD SEP-OCT PY 1995 VL 13 IS 5 BP 2564 EP 2568 DI 10.1116/1.579450 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA RV828 UT WOS:A1995RV82800039 ER PT J AU SHABALOVSKAYA, SA ANDEREGG, JW AF SHABALOVSKAYA, SA ANDEREGG, JW TI SURFACE SPECTROSCOPIC CHARACTERIZATION OF TINI NEARLY EQUIATOMIC SHAPE-MEMORY ALLOYS FOR IMPLANTS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article ID X-RAY; PHOTOELECTRON; FILMS AB In spite of the generally good biocompatibility of TiNi revealed in numerous in vivo studies, medical applications of these shape memory alloys as implants are hindered due to the lack of knowledge on the nature of their biocompatibility. Better material characterization is necessary for understanding the chemical and physical properties which determine biocompatibility. The purpose of the present investigation is to use angle-resolved x-ray photoelectron spectroscopy to identify the differences in surface chemical state and composition between the layers formed on the surface of TiNi alloys after mechanical polishing, chemical etching, autoclaving in water and steam, and exposure to H2O2 or air. The surface chemistry drastically depends on the preparation method; the Ni surface concentration can be varied in the range 0-30 at. %. In natural conditions (air, water, and steam) TiNi surfaces revealed a tendency to be covered by TixNiyO2x oxides (where x varies in the range of 7-20 and y varies in the range of 0-5 depending on preparation procedure) with a small amount of Ni in metallic state (similar to 0.5 at. %). This finding is considered to be the reason for the good biocompatibility of TiNi. (C) 1995 American Vacuum Society. C1 US DOE,AMES LAB,AMES,IA 50011. NR 13 TC 113 Z9 116 U1 2 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD SEP-OCT PY 1995 VL 13 IS 5 BP 2624 EP 2632 DI 10.1116/1.579461 PG 9 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA RV828 UT WOS:A1995RV82800051 ER PT J AU SPALLAS, JP HAWRYLUK, AM KANIA, DR AF SPALLAS, JP HAWRYLUK, AM KANIA, DR TI FIELD EMITTER ARRAY MASK PATTERNING USING LASER INTERFERENCE LITHOGRAPHY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article ID EMISSION; SILICON AB We have fabricated uniform arrays of 120-nm-diam dot masks on 300 nm centers using laser interference lithography. Chrome, cobalt, nickel, and germanium dot arrays have been fabricated. The density of these arrays is >10(9) dots/cm(2). The standard deviation of the average dot diameter is 7.4% over a 5-cm-diam silicon substrate. The center-to-center spacing of the dot mask is determined by the laser wavelength and interference angle. Some control over the dot diameter is possible by varying the angle of the substrate during the metal deposition prior to liftoff. We have used a reactive ion etch with these metal dot masks to form single crystal silicon pedestals demonstrating that these structures are suitable for self-aligned gated held emitter array fabrication. (C) 1995 American Vacuum Society. RP SPALLAS, JP (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 16 TC 60 Z9 64 U1 2 U2 9 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD SEP-OCT PY 1995 VL 13 IS 5 BP 1973 EP 1978 DI 10.1116/1.588117 PG 6 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA TA466 UT WOS:A1995TA46600007 ER PT J AU SHUL, RJ HOWARD, AJ PEARTON, SJ ABEMATHY, CR VARTULI, CB BARNES, PA BOZACK, MJ AF SHUL, RJ HOWARD, AJ PEARTON, SJ ABEMATHY, CR VARTULI, CB BARNES, PA BOZACK, MJ TI HIGH-RATE ELECTRON-CYCLOTRON-RESONANCE ETCHING OF GAN, INN, AND AIN SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article ID GALLIUM NITRIDE; GROWTH AB Electron cyclotron resonance etch rates of GaN, InN, and AlN are reported as a function of pressure, microwave power, and radio-frequency (rf) power in a Cl-2/H-2/CH4/Ar plasma at 170 degrees C. The etch rates for GaN and InN increase as a function of rf power. Al 275 W, the etch rates reach maximum values of 2850 and 3840 Angstrom/min, respectively. These are the highest etch rates reported for these materials. As a function of pressure, the etch rates reach a maximum value at 2 mTorr and then decrease as the pressure is increased to 10 mTorr. The GaN and ALN etch rates increase less than a factor of 2 as the microwave power is increased from 125 to 850 W whereas the InN etch rate increases by more than a factor of 3.5. The maximum etch rate for AlN obtained in this study is 1245 Angstrom/min at a microwave power of 850 W, 1 mTorr pressure, and 225 W rf power. Atomic force microscopy is used to determine root-mean-square roughness as a function of etch conditions for GaN and InN and, while very smooth pattern transfer can be obtained for a wide range of plasma conditions for GaN, the smoothness of the etched InN surface is more sensitive to rf power, microwave power, and process pressure. The surface composition of the GaN is characterized using Auger spectroscopy and has shown that the Ga:N ratio increases with increasing rf power or microwave power. (C) 1995 American Vacuum Society. C1 UNIV FLORIDA,DEPT MAT SCI & ENGN,GAINESVILLE,FL 32611. AUBURN UNIV,DEPT PHYS,AUBURN,AL 36849. RP SHUL, RJ (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 24 TC 28 Z9 28 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD SEP-OCT PY 1995 VL 13 IS 5 BP 2016 EP 2021 DI 10.1116/1.588126 PG 6 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA TA466 UT WOS:A1995TA46600016 ER PT J AU CONSTANTINE, C SHUL, RJ SULLIVAN, CT SNIPES, MB MCCLELLAN, GB HAFICH, M FULLER, CT MILEHAM, JR PEARTON, SJ AF CONSTANTINE, C SHUL, RJ SULLIVAN, CT SNIPES, MB MCCLELLAN, GB HAFICH, M FULLER, CT MILEHAM, JR PEARTON, SJ TI ETCHING OF GAAS/ALGAAS RIB WAVE-GUIDE STRUCTURES USING BCL3/CL-2/N-2/AR ELECTRON-CYCLOTRON-RESONANCE SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article ID WAVE-GUIDES; INP; SEMICONDUCTORS; DISCHARGES; PLASMA; DAMAGE; LASERS AB An anisotropic nonselective etch for GaAs/AlGaAs rib waveguides has been developed for use under electron cyclotron resonance conditions. The plasma chemistry features BCl3 to minimize AlGaAs oxidation effects and small additions of N-2 to induce sidewall protection when using photoresist masks. The fundamental mode attenuation hi GaAs/AlGaAs waveguides is sensitive to the choice of both plasma chemistry and masking material, but can be reduced to <1 dB cm(-1) for channel widths of 4-5 mu m. (C) 1995 American Vacuum Society. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. UNIV FLORIDA,GAINESVILLE,FL 32611. RP CONSTANTINE, C (reprint author), PLASMA THERM IP,ST PETERSBURG,FL 33716, USA. NR 36 TC 16 Z9 16 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD SEP-OCT PY 1995 VL 13 IS 5 BP 2025 EP 2030 DI 10.1116/1.588128 PG 6 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA TA466 UT WOS:A1995TA46600018 ER PT J AU LIN, XW LAMPERT, WV HAAS, TW HOLLOWAY, PH LILIENTALWEBER, Z SWIDER, W WASHBURN, J AF LIN, XW LAMPERT, WV HAAS, TW HOLLOWAY, PH LILIENTALWEBER, Z SWIDER, W WASHBURN, J TI METALLURGY OF AL-NI-GE OHMIC CONTACT FORMATION ON N-GAAS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article ID SOLID-PHASE EPITAXY; COMPOUND SEMICONDUCTORS; 1ST PHASE; NUCLEATION; SYSTEM; MICROSTRUCTURE; INTERDIFFUSION; INTERFACES; GROWTH AB Al-Ni-Ge ohmic contacts on n-GaAs were prepared by sequential vapor deposition and furnace annealing at 500 degrees C. The metallurgical properties of the contacts were studied by transmission electron microscopy. It was found that while Al-Ni-Ge as a whole is relatively stable against GaAs, extensive interfacial reactions readily occur within the contact layers, resulting in a very stable layered structure of the type Al3Ni/Ni-Ge/GaAs, with epsilon'-Ni5Ge3 being the major phase in the Ni-Ge layer. GaAs twins and Ni-As precipitates were found in a thin layer immediately below the metallization, suggesting that the ohmic behavior can be accounted for in terms of a GaAs regrowth mechanism. (C) 1995 American Vacuum Society. C1 WRIGHT LAB,MAT DIRECTORATE,WRIGHT PATTERSON AFB,OH 45433. UNIV FLORIDA,DEPT MAT SCI & ENGN,GAINESVILLE,FL 32611. RP LIN, XW (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. RI Liliental-Weber, Zuzanna/H-8006-2012 NR 49 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD SEP-OCT PY 1995 VL 13 IS 5 BP 2081 EP 2091 DI 10.1116/1.588081 PG 11 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA TA466 UT WOS:A1995TA46600027 ER PT J AU LOUSSERTAJAKA, I CHAIX, ML KORBER, B LETOURNEUR, F GOMAS, E ALLEN, E LY, TD BRUNVEZINET, F SIMON, F SARAGOSTI, S AF LOUSSERTAJAKA, I CHAIX, ML KORBER, B LETOURNEUR, F GOMAS, E ALLEN, E LY, TD BRUNVEZINET, F SIMON, F SARAGOSTI, S TI VARIABILITY OF HUMAN-IMMUNODEFICIENCY-VIRUS TYPE-1 GROUP-O STRAINS ISOLATED FROM CAMEROONIAN PATIENTS LIVING IN FRANCE SO JOURNAL OF VIROLOGY LA English DT Article ID PRINCIPAL NEUTRALIZING DETERMINANT; NUCLEOTIDE-SEQUENCE; V3 REGION; GENETIC DIVERSITY; ENVELOPE PROTEIN; HIV-1; AIDS; DOMAIN; RETROVIRUS; AFRICAN AB Human immunodeficiency virus type 1 (HIV-1) nucleotide sequences encoding p24(Gag) and the Env C2V3 region were obtained from seven patients,who were selected on the basis of having paradoxical seronegativity on a subset of HIV enzyme linked immunosorbent assay detection kits and having atypical Western blot (immunoblot) reactivity. Sequence analyses showed that all of these strains were more closely related to the recently described Cameroonian HN isolates of group O (HIV-1 outlier) than to group M (HIV-1 major). All seven patients had Cameroonian origins but were living in France at the time the blood samples were taken. Characterization of a large number of group M strains has to date revealed eight distinct genetic subtypes (A to H). Genetic distances between sequences from available group O isolates were generally comparable to those observed in M intersubtype sequence comparisons, showing that the group O viruses are genetically very diverse. Analysis of sequences from these seven new viral strains, combined with the three previously characterized group O strains, revealed few discernable phylogenetic: clustering patterns among the 10 patients' viral sequences. The level of diversity among group O sequences suggests that they may have a comparable (or greater) age than the M group sequences, although for unknown reasons, the latter group dispersed first and is the dominant lineage in the pandemic. C1 HOP COCHIN,INST COCHIN GENET MOLEC,INSERM,U363,F-75014 PARIS,FRANCE. HOP BICHAT,VIROL LAB,F-75877 PARIS 18,FRANCE. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. SANTA FE INST,SANTA FE,NM 87501. OI Korber, Bette/0000-0002-2026-5757 NR 70 TC 123 Z9 127 U1 0 U2 2 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0022-538X J9 J VIROL JI J. Virol. PD SEP PY 1995 VL 69 IS 9 BP 5640 EP 5649 PG 10 WC Virology SC Virology GA RN986 UT WOS:A1995RN98600053 PM 7637010 ER PT J AU WOHLETZ, K ORSI, G DEVITA, S AF WOHLETZ, K ORSI, G DEVITA, S TI ERUPTIVE MECHANISMS OF THE NEAPOLITAN-YELLOW-TUFF INTERPRETED FROM STRATIGRAPHIC, CHEMICAL, AND GRANULOMETRIC DATA SO JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH LA English DT Article ID MAGMATIC SILICATE LIQUIDS; CAMPI FLEGREI; PHREATOPLINIAN ERUPTION; STRUCTURAL EVOLUTION; PHLEGRAEAN FIELDS; NEW-ZEALAND; ST-HELENS; DYNAMICS; WITHDRAWAL; RESERVOIRS AB The Neapolitan Yellow Tuff (12 ka) is the second largest pyroclastic deposit of the Campanian Volcanic Area covering at least 1000 km(2) with conservative estimates of volume placed at 40 km(3). Previous studies showed that this mainly trachytic deposit, composed of two members, was erupted by (1) a central-vent, mostly phreatoplinian phase (Lower Member) that generated pyroclastic surges and fallout reaching 34 km from the vent, followed by (2) a multiple-vent, phreatomagmatic and magmatic phase (Upper Member) associated with onset of caldera collapse that produced surges extending 14 km from the vent. The Lower Member is well bedded and comprises 13 subunits that alternate between phreatoplinian surges/flows and Plinian pumice-and-ash fallout. The Upper Member is relatively lithic-rich and more massive in character. For both members, magma compositions vary from alkali trachyte through trachyte to latite, which does not fit a simple inversion of magma chamber gradients. Calculations based on magma chemistry show an increase in magma density, a decrease followed by an increase in viscosity, and a general decrease of gas fraction during the course of both eruptive phases. After migrating to a depth of about 400 m, calculated fragmentation depths gradually rise during each phase. Application of sequential fragmentation/transport analysis to granulometric data shows for the lower member an average ratio of phreatomagmatic to magmatic components of 70:30 while the upper member shows an average ratio of 80:20. However, considering the tephra volume represented by samples, computed water/magma interaction ratios (R) are shown to fluctuate, but generally decrease from about 0.65 to 0.05 during eruption of the Lower Member while the Upper Member shows R fairly constant at about 0.1. Furthermore, surge/flow runout distances and estimates of eruptive velocities from R values show that column collapse heights were extremely high (6 to 7 km) during the first phase and were substantially lower during the second phase (2 to 3 km). Vent radii required for calculated eruption velocities of 180 to 370 m/s are between 70 and 300 m, suggesting a cumulative eruption duration of over 10 hours, perhaps spanning of one to several days. C1 UNIV NAPLES,DIPARTIMENTO GEOFIS & VULCANOL,I-80138 NAPLES,ITALY. RP WOHLETZ, K (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI de Vita, Sandro/G-5974-2011 NR 68 TC 59 Z9 61 U1 2 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-0273 J9 J VOLCANOL GEOTH RES JI J. Volcanol. Geotherm. Res. PD SEP PY 1995 VL 67 IS 4 BP 263 EP 290 DI 10.1016/0377-0273(95)00002-C PG 28 WC Geosciences, Multidisciplinary SC Geology GA TA259 UT WOS:A1995TA25900004 ER PT J AU HARTMAN, GD AF HARTMAN, GD TI AGE-DETERMINATION, AGE STRUCTURE, AND LONGEVITY IN THE MOLE, SCALOPUS-AQUATICUS (MAMMALIA, INSECTIVORA) SO JOURNAL OF ZOOLOGY LA English DT Article AB Three hundred and eighty-two moles, Scalopus aquaticus, were collected from 16 sampling grids located within a 23 km(2) area in South Carolina, USA. Age of moles was determined using tooth wear. Both the mean and median ages of trapped moles were c. two years; the oldest mole was in its seventh year of life. More than 50% of the individuals are estimated to die during the first six months of life; adult survivorship was relatively high and age-dependent. There was differential mortality between the sexes, and females lived longer than males. Scalopus aquaticus in South Carolina lived c. 1.2 times longer than the maximum lifespan predicted on the basis of body mass. Pooled samples of moles yielded the expected age distribution, with fewer individuals occurring in successively older age classes. However, based on bootstrap estimates of the variance in age structure, samples from some grids contained significantly more young or old individuals than expected due to sampling error. Mole populations appear not to be in demographic equilibrium at this local scale, but instead conform more closely to a metapopulation-type of structure. C1 UNIV NEW MEXICO,DEPT BIOL,ALBUQUERQUE,NM 87131. UNIV NEW MEXICO,MUSEUM SW BIOL,ALBUQUERQUE,NM 87131. RP HARTMAN, GD (reprint author), SAVANNAH RIVER ECOL LAB,DRAWER E,AIKEN,SC 29802, USA. NR 35 TC 9 Z9 9 U1 0 U2 8 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0952-8369 J9 J ZOOL JI J. Zool. PD SEP PY 1995 VL 237 BP 107 EP 122 PN 1 PG 16 WC Zoology SC Zoology GA RX561 UT WOS:A1995RX56100010 ER PT J AU RITCHIE, B AF RITCHIE, B TI QUANTUM-CLASSICAL ELECTRODYNAMIC FIELD CORRESPONDENCE IN QUANTUM OPTICS - SELF-QUANTIZATION SO LASER PHYSICS LA English DT Article AB In an earlier paper [2], Maxwell's equation for the self field of a point electron is solved with appropriate boundary conditions such that a correspondence is established between the classical field and the operator field of quantum electrodynamics [5]. In this paper, the dispersive properties of the field are elucidated, and a further correspondence is found in the discreteness of the spectrum for a bound electron. RP RITCHIE, B (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU INTERPERIODICA PI BIRMINGHAM PA PO BOX 1831, BIRMINGHAM, AL 35201-1831 SN 1054-660X J9 LASER PHYS JI Laser Phys. PD SEP-OCT PY 1995 VL 5 IS 5 BP 1001 EP 1005 PG 5 WC Optics; Physics, Applied SC Optics; Physics GA TB266 UT WOS:A1995TB26600008 ER PT J AU Majors, RE AF Majors, RE TI Trends in sample preparation an automation - What the experts are saying SO LC GC-MAGAZINE OF SEPARATION SCIENCE LA English DT Editorial Material C1 FREE UNIV AMSTERDAM,AMSTERDAM,NETHERLANDS. UNIV ARIZONA,TUCSON,AZ. SANDOZ PHARMA AG,ANALYT DEV,BASEL,SWITZERLAND. HEWLETT PACKARD CORP,SAMPLE PREPARAT & INTRODUCT,WILMINGTON,DE. DUQUESNE UNIV,PITTSBURGH,PA 15219. DUPONT CO INC,ANALYT TECHNOL,AGR PROD,WILMINGTON,DE. UNIV HOSP,INST CLIN CHEM,MUNICH,GERMANY. CIBA GEIGY CORP,BIOANALYT & PHARMACOKINET,SUMMIT,NJ 07901. ASTRO DRACO AB,BIOANALYT CHEM,LUND,SWEDEN. AMGEN INC,HERSHEY FOODS,CTR TECH,THOUSAND OAKS,CA 91320. NIST,GAITHERSBURG,MD 20899. ZYMARK CORP,HOPKINTON,MA. RP Majors, RE (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM, USA. NR 1 TC 26 Z9 26 U1 0 U2 1 PU ADVANSTAR COMMUNICATIONS PI DULUTH PA 131 W FIRST ST, DULUTH, MN 55802 SN 0888-9090 J9 LC GC-MAG SEP SCI JI LC GC-Mag. Sep. Sci. PD SEP PY 1995 VL 13 IS 9 BP 742 EP & PG 5 WC Chemistry, Analytical SC Chemistry GA VG461 UT WOS:A1995VG46100007 ER PT J AU FITZGERALD, V BLANK, ML SNYDER, F AF FITZGERALD, V BLANK, ML SNYDER, F TI MOLECULAR-SPECIES OF SPHINGOMYELIN IN SPHINGOMYELINASE-SENSITIVE AND SPHINGOMYELINASE-RESISTANT POOLS OF HL-60 CELLS SO LIPIDS LA English DT Article ID PLATELET-ACTIVATING FACTOR; NECROSIS-FACTOR-ALPHA; CERAMIDE; DIFFERENTIATION; PHOSPHOLIPASE-A2; TURNOVER; GROWTH AB This study of sphingomyelin molecular species in undifferentiated and differentiated (granulocytic form) HL-60 cells demonstrated only minor differences in the distribution of species between the sphingomyelinase-sensitive and sphingomyelinase-resistant pools of sphingomyelin in these cells. The two most prominent species of sphingosine present in both the undifferentiated and differentiated cells were those containing 16:0 (slightly higher in the sphingomyelinase-resistant membranes) and 24:1 N-acyl moieties. Cell differentiation exerted little effect on the distribution of molecular species of sphingomyelin between the sphingomyelinase-sensitive and sphingomyelinase-resistant pools in HL-60 cells, although the levels of N-palmitoyl sphinganine were significantly lower and the N-nervonoyl sphingosine higher in both pools from the differentiated cells. Our results indicate the same species of sphingomyelin, available at both the outer layer of the plasma membrane and inner layer of the plasma membrane (plus intracellular membranes) of HL-60 cells, serve as-precursors for generation of the ceramides that participate in signal transduction processes initiated by cell activation. C1 OAK RIDGE ASSOCIATED UNIV,DIV MED SCI,OAK RIDGE,TN 37831. NR 25 TC 15 Z9 15 U1 0 U2 0 PU AMER OIL CHEMISTS SOC PI CHAMPAIGN PA 1608 BROADMOOR DRIVE, CHAMPAIGN, IL 61821-0489 SN 0024-4201 J9 LIPIDS JI Lipids PD SEP PY 1995 VL 30 IS 9 BP 805 EP 809 DI 10.1007/BF02533955 PG 5 WC Biochemistry & Molecular Biology; Nutrition & Dietetics SC Biochemistry & Molecular Biology; Nutrition & Dietetics GA RV085 UT WOS:A1995RV08500003 PM 8577223 ER PT J AU TUZUN, RE NOID, DW SUMPTER, BG AF TUZUN, RE NOID, DW SUMPTER, BG TI MOLECULAR-DYNAMICS TREATMENT OF TORSIONAL INTERACTIONS ACCOMPANIED BY DISSOCIATION SO MACROMOLECULAR THEORY AND SIMULATIONS LA English DT Article ID DERIVATIVE MATRIX-ELEMENTS; FORCE-FIELD; SIMULATIONS; 1ST AB When three atoms in a bend sequence move into a linear configuration, any torsional angle involving those three atoms becomes undefined and its Cartesian derivatives singular. In molecular dynamics simulations, this is most likely to occur during and after a bond-breaking process, leading to spuriously large torsional forces and energies which invalidate the simulation. By including appropriate bend angle switching functions in torsional interaction terms, one may approach the linear bend limit in a well-defined manner and make torsional forces vanish around this limit, as expected on physical grounds. Although this makes potential energy terms more complicated and force evaluations more expensive, this expense can be greatly reduced by observing that any internal force must not move the center of mass of the particles involved. Several approximations explored in this paper can reduce this effort even further. RP TUZUN, RE (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831, USA. RI Sumpter, Bobby/C-9459-2013 OI Sumpter, Bobby/0000-0001-6341-0355 NR 11 TC 12 Z9 12 U1 0 U2 3 PU HUTHIG & WEPF VERLAG PI BASEL PA AUF DEM WOLF 4 FX#001-41-61-317-94-11, CH-4052 BASEL, SWITZERLAND SN 1022-1344 J9 MACROMOL THEOR SIMUL JI Macromol. Theory Simul. PD SEP PY 1995 VL 4 IS 5 BP 909 EP 920 DI 10.1002/mats.1995.040040504 PG 12 WC Polymer Science SC Polymer Science GA RV098 UT WOS:A1995RV09800004 ER EF