FN Thomson Reuters Web of Science™ VR 1.0 PT J AU Cowin, JP Iedema, MJ Wu, K Tsekouras, AA AF Cowin, JP Iedema, MJ Wu, K Tsekouras, AA TI Proton transport in ice: Failure of the tunneling mechanism. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. Univ Athens, GR-10679 Athens, Greece. RI Wu, Kai/A-4903-2011 OI Wu, Kai/0000-0002-5016-0251 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 171-PHYS BP U180 EP U180 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300989 ER PT J AU Craig, PR Ray, JM Trujillo, M Kirby, JP Miller, JR Michl, J AF Craig, PR Ray, JM Trujillo, M Kirby, JP Miller, JR Michl, J TI Tuning the redox potential of tetraphenylcyclobutadiene-cyclopentadienylnickel complexes through substitution. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA. Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. RI Michl, Josef/G-9376-2014 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 502-INOR BP U527 EP U527 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202863 ER PT J AU Crawford, CL Ferrara, DM Schumacher, RF Bibler, NE AF Crawford, CL Ferrara, DM Schumacher, RF Bibler, NE TI Analysis of Hanford low activity waste pretreated supernate and immobilized glass product in support of Hanford treatability study. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Westinghouse Savannah River Co, Savannah River Technol Ctr, Aiken, SC 29808 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 56-NUCL BP U11 EP U11 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300057 ER PT J AU Crette, SA DeSimone, JM Carbonell, RG Tumas, W Brady, JT AF Crette, SA DeSimone, JM Carbonell, RG Tumas, W Brady, JT TI Solid supports for CO2 applications. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ N Carolina, Dept Chem, Chapel Hill, NC 27599 USA. N Carolina State Univ, Dept Chem Engn, Raleigh, NC 27695 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Div Chem Sci & Technol, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 413-POLY BP U315 EP U315 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091301812 ER PT J AU Crump, SL Young, JE AF Crump, SL Young, JE TI Quantitation of TBP in aqueous solutions using isotopic dilution and GC/MS SIM analysis. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Westinghouse Savannah River Co, Savannah River Technol Ctr, Aiken, SC 29808 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 73-NUCL BP U13 EP U14 PN 2 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300074 ER PT J AU Dahlman, RC Jacobs, GK AF Dahlman, RC Jacobs, GK TI Research challenges for carbon sequestration in terrestrial ecosystems. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Off Biol & Environm Res, Germantown, MD 20874 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 69-FUEL BP U395 EP U395 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202099 ER PT J AU Dai, PS Cebe, P Alamo, RG Capel, M Mandelkern, L AF Dai, PS Cebe, P Alamo, RG Capel, M Mandelkern, L TI Wide and small angle X-ray scattering study of melting kinetics of isotactic polypropylene. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Tufts Univ, Dept Phys & Astron, Medford, MA 02155 USA. Florida A&M Univ, Dept Chem Engn, Tallahassee, FL USA. Florida State Univ, Coll Engn, Tallahassee, FL 32306 USA. Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA. Florida State Univ, Dept Chem, Tallahassee, FL 32306 USA. Florida State Univ, Inst Mol Biophys, Tallahassee, FL 32306 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 127-PMSE BP U347 EP U347 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091301992 ER PT J AU Dai, S AF Dai, S TI Molecular recognition in ionic liquids. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RI Dai, Sheng/K-8411-2015 OI Dai, Sheng/0000-0002-8046-3931 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 19-IEC BP U415 EP U415 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202196 ER PT J AU Dai, S Makote, R Stephan, A Wallace, SA Miller, LF AF Dai, S Makote, R Stephan, A Wallace, SA Miller, LF TI Sol-gel approach to neutron detectors. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Univ Tennessee, Knoxville, TN 37996 USA. RI Dai, Sheng/K-8411-2015 OI Dai, Sheng/0000-0002-8046-3931 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 154-NUCL BP U25 EP U25 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300154 ER PT J AU Dang, LX AF Dang, LX TI Molecular dynamics simulations with polarizable potential models. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 27-COMP BP U280 EP U281 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201478 ER PT J AU Dang, LX AF Dang, LX TI Computer simulation studies of ion transport across a liquid/liquid interface. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 24-COLL BP U229 EP U229 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201160 ER PT J AU Dewberry, RA Leyba, JD Ferrara, DM AF Dewberry, RA Leyba, JD Ferrara, DM TI Separation and purification and beta liquid scintillation analysis of Sm-151 in Savannah River Site and Hanford Site DOE high level waste. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Westinghouse Savannah River Co, Savannah River Technol Lab, Analyt Dev Sect, Aiken, SC 29801 USA. Westinghouse Savannah River Co, Immobilizat Technol Sect, Aiken, SC 29801 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 13-NUCL BP U4 EP U4 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300014 ER PT J AU Diallo, MS Faulon, JL Strachan, A Sarbar, M Goddard, WA AF Diallo, MS Faulon, JL Strachan, A Sarbar, M Goddard, WA TI Thermodynamic and structural properties of asphaltenes from molecular dynamics simulations. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Howard Univ, Dept Civil Engn, Washington, DC 20059 USA. Sandia Natl Labs, Computat Mat Sci Dept, Livermore, CA 94550 USA. CALTECH, Mat & Proc Simulat Ctr, Pasadena, CA 91125 USA. Saudi Aramco, Lab Res & Dev Ctr, Dhahran, Saudi Arabia. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 19-PETR BP U141 EP U141 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300764 ER PT J AU Dietz, ML Bond, AH Chiarizia, R Herlinger, AW Huber, VJ Hay, BP Finch, JW AF Dietz, ML Bond, AH Chiarizia, R Herlinger, AW Huber, VJ Hay, BP Finch, JW TI Optimization of solvent extraction systems using molecular mechanics methods. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Loyola Univ, Dept Chem, Chicago, IL 60626 USA. Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA USA. NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 45-IEC BP U419 EP U419 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202222 ER PT J AU DiPrete, DP Bibler, NE Boyce, WT Coleman, CJ AF DiPrete, DP Bibler, NE Boyce, WT Coleman, CJ TI Measurement of americium and curium isotopes in Savannah River Site high activity waste sludge. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Westinghouse Savannah River Co, Savannah River Technol Ctr, Aiken, SC 29808 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 7-NUCL BP U3 EP U3 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300008 ER PT J AU Dixon, DA AF Dixon, DA TI Applications of density functional theory to the study of inorganic compounds. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 145-INOR BP U476 EP U476 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202511 ER PT J AU Dixon, DA Nichols, JA Garza, J AF Dixon, DA Nichols, JA Garza, J TI Density functional theory: Practical applications and issues. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. Univ Autonoma Metropolitana Iztapalapa, Dept Chem, Iztapalapa, Mexico. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 9-INOR BP U447 EP U447 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202375 ER PT J AU Dressler, R Chiu, YH Pullins, S Levandier, D Qian, XM Song, Y Ng, C AF Dressler, R Chiu, YH Pullins, S Levandier, D Qian, XM Song, Y Ng, C TI Collision-induced dissociation of diatomic molecules at high levels of vibrational excitation. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USAF, Res Lab, Space Vehicles Directorate, Bedford, MA 01731 USA. Iowa State Univ, Ames Lab, Ames, IA USA. Iowa State Univ, Dept Chem, Ames, IA USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 36-PHYS BP U161 EP U161 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300855 ER PT J AU Eichler, R Gaeggeler, H Tuerler, A Gregorich, KE Hoffman, DC Nitsche, H Laue, CA Schaedel, M Yakushev, AB AF Eichler, R Gaeggeler, H Tuerler, A Gregorich, KE Hoffman, DC Nitsche, H Laue, CA Schaedel, M Yakushev, AB TI First chemical characterization of bohrium (element 107). SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Bern, Paul Scherrer Inst, CH-5232 Villigen, Switzerland. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Gesell Schwerionenforsch, Darmstadt, Germany. Flerov Lab Nucl React, Dubna, Russia. RI Eichler, Robert/G-5130-2011 NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 18-NUCL BP U5 EP U5 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300019 ER PT J AU Evans, J Stoldt, C Caspersen, K Bartelt, M Layson, T Thiel, P AF Evans, J Stoldt, C Caspersen, K Bartelt, M Layson, T Thiel, P TI Morphological evolution during multilayer growth of metal films: Simulation and experiment. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Iowa State Univ, Dept Math, Ames, IA 50011 USA. Iowa State Univ, Dept Chem, Ames, IA 50011 USA. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Sandia Natl Labs, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 73-COLL BP U236 EP U236 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201209 ER PT J AU Fauth, DJ Goldberg, PM Knoer, JP Soong, Y AF Fauth, DJ Goldberg, PM Knoer, JP Soong, Y TI Carbon dioxide storage as mineral carbonates. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Natl Energy Technol Lab, Pittsburgh, PA 15236 USA. NR 0 TC 2 Z9 2 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 67-FUEL BP U395 EP U395 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202097 ER PT J AU Fields, RS Majidi, V Wayne, DM AF Fields, RS Majidi, V Wayne, DM TI Miniature quadrupole glow discharge mass spectrometer for glovebox-based analysis. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 40-NUCL BP U9 EP U9 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300041 ER PT J AU Franz, JA Kolwaite, DS Linehan, JC Goldberg, KI Look, JL AF Franz, JA Kolwaite, DS Linehan, JC Goldberg, KI Look, JL TI Absolute rate expressions for reaction of benzyl radical with transition metal hydrides. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Phys Organ Chem & Laser Spectroscopy Grp, Richland, WA 99352 USA. Univ Washington, Dept Chem, Seattle, WA 98195 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 335-INOR BP U503 EP U503 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202701 ER PT J AU Fujita, Y Ferris, FG Colwell, FS Ingram, JC Smith, RW AF Fujita, Y Ferris, FG Colwell, FS Ingram, JC Smith, RW TI Accelerated calcium carbonate precipitation by aquifer microorganisms: A possible in situ remediation technique for radionuclides and metals. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Idaho Natl Engn Lab, Dept Biotechnol, Idaho Falls, ID 83415 USA. Univ Toronto, Dept Geol, Toronto, ON, Canada. Idaho Natl Engn Lab, Dept Chem, Idaho Falls, ID 83415 USA. Idaho Natl Engn Lab, Dept Integrated Earth Sci, Idaho Falls, ID 83415 USA. RI Fujita, Yoshiko/S-2007-2016 OI Fujita, Yoshiko/0000-0002-4472-4102 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 175-ENVR BP U344 EP U344 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201797 ER PT J AU Fulton, JL AF Fulton, JL TI Transitions in the coordination structure about ions in supercritical water from X-ray absorption spectroscopy. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Environm & Hlth Sci Div, Richland, WA 99352 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 71-PHYS BP U166 EP U166 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300890 ER PT J AU Fulton, JL AF Fulton, JL TI Strategy for the formation of an AOT microemulsion in Co-2 using a fluorinated co-surfactant. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Div Environm & Hlth Sci, Supercrit Fluid Res, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 50-COLL BP U233 EP U233 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201186 ER PT J AU Gallagher, LA Serron, SA Meyer, TJ AF Gallagher, LA Serron, SA Meyer, TJ TI Photocurrents coupled to oxidation by ruthenium polypyridyl complexes. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ N Carolina, Dept Chem, Chapel Hill, NC 27599 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 360-INOR BP U506 EP U506 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202725 ER PT J AU Ghanbari, F Mohagheghi, AH AF Ghanbari, F Mohagheghi, AH TI Neutron detector based on prompt neutron activation. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 133-NUCL BP U22 EP U22 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300133 ER PT J AU Gilbertson, M AF Gilbertson, M TI Characterizing environmental contamination: The hardest part is still ahead. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Off Environm Management, Off Basic & Applied Res, Washington, DC 20585 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 140-ANYL BP U99 EP U99 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091200467 ER PT J AU Goldberg, SA Richter, S Croatto, PV AF Goldberg, SA Richter, S Croatto, PV TI High performance mass spectrometers for nuclear safeguards measurements. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, New Brunswick Lab, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 37-NUCL BP U8 EP U8 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300038 ER PT J AU Goldhaber, G AF Goldhaber, G TI Evidence for the accelerated expansion of the universe based on type Ia supernovae. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Phys, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 144-NUCL BP U24 EP U24 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300144 ER PT J AU Grant, PM Alcaaraz, A Whipple, RE Andresen, BD AF Grant, PM Alcaaraz, A Whipple, RE Andresen, BD TI Analyses of questioned CBW specimens at the Livermore Forensic Science Center. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Analyt & Nucl Chem Div, Livermore, CA 94550 USA. Univ Calif Lawrence Livermore Natl Lab, Forens Sci Ctr, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 61-NUCL BP U12 EP U12 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300062 ER PT J AU Greenlaw, PD Sanderson, CG AF Greenlaw, PD Sanderson, CG TI Certification of a radionuclide laboratory for the Comprehensive Nuclear-Test-Ban Treaty International Monitoring System. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Environm Measurements Lab, New York, NY 10014 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 100-NUCL BP U17 EP U17 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300100 ER PT J AU Gregorich, KE Ninov, V AF Gregorich, KE Ninov, V TI Unshielded fusion and the production of superheavy elements. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 51-NUCL BP U10 EP U10 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300052 ER PT J AU Gu, BH Brown, GM Urbansky, ET Magnuson, ML AF Gu, BH Brown, GM Urbansky, ET Magnuson, ML TI Determination of perchlorate in fertilizers by ion chromatography. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. US EPA, Natl Risk Management Res Lab, Washington, DC USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 16-FERT BP U378 EP U378 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202011 ER PT J AU Gu, BH Chen, J Vairavamurthy, MA Choi, SY AF Gu, BH Chen, J Vairavamurthy, MA Choi, SY TI Chemical and biological reduction of contaminant metals by natural organic matter. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. Brookhaven Natl Lab, Dept Appl Sci, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 346-ENVR BP U370 EP U370 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201968 ER PT J AU Haas, O Muller, S Holzer, F McBreen, J Sun, X Yang, XQ AF Haas, O Muller, S Holzer, F McBreen, J Sun, X Yang, XQ TI EXAFS investigation of La0.6Ca0.4CoO3 perovskite catalyst in bifunctional oxygen electrodes. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Paul Scherrer Inst, CH-5232 Villigen, Switzerland. Brookhaven Natl Lab, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 65-ANYL BP U88 EP U89 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091200392 ER PT J AU Hale, GM Johnson, AS AF Hale, GM Johnson, AS TI Evaluated cross sections for BBN and helium-burning reactions. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 64-NUCL BP U12 EP U12 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300065 ER PT J AU Hall, MB Niu, SQ Thomson, L Cao, ZX Li, SH AF Hall, MB Niu, SQ Thomson, L Cao, ZX Li, SH TI Theoretical characterization of the reaction intermediates in models for nickel-iron and iron-only hydrogenases. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Texas A&M Univ, Dept Chem, College Stn, TX 77842 USA. Pacific NW Natl Lab, Richland, WA 99352 USA. RI Hall, Michael/B-9118-2013 OI Hall, Michael/0000-0003-3263-3219 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 295-INOR BP U497 EP U498 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202661 ER PT J AU Hay, PJ Martin, RL AF Hay, PJ Martin, RL TI Using effective core potentials and basis sets in DFT calculations. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 13-INOR BP U447 EP U447 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202379 ER PT J AU Hirsch, RF AF Hirsch, RF TI Analytical science at the center of chemistry and beyond its fringe. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Off Biol & Environm Res, Div Med Sci, Germantown, MD 20874 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 124-ANYL BP U97 EP U97 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091200451 ER PT J AU Hix, WR AF Hix, WR TI Zeroing in on the core collapse supernova mechanism. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Dept Phys, Oak Ridge, TN 37831 USA. RI Hix, William/E-7896-2011 OI Hix, William/0000-0002-9481-9126 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 129-NUCL BP U21 EP U22 PN 2 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300129 ER PT J AU Hobbs, DT Bello, JM Forney, RW AF Hobbs, DT Bello, JM Forney, RW TI Determination of corrosion species in high-level nuclear waste using Raman spectroscopy. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Westinghouse Savannah River Co, Savannah River Technol Ctr, Aiken, SC 29808 USA. EIC Labs Inc, Norwood, MA 02062 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 62-NUCL BP U12 EP U12 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300063 ER PT J AU Hochel, RC AF Hochel, RC TI New measurement techniques and results for tritium in concrete. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Westinghouse Savannah River Co, Savannah River Technol Ctr, Aiken, SC 29808 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 72-NUCL BP U13 EP U13 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300073 ER PT J AU Hoffman, DC Lee, DM AF Hoffman, DC Lee, DM TI Many-faceted career of Glenn T. Seaborg. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 1-NUCL BP U3 EP U3 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300002 ER PT J AU Hoffman, RD AF Hoffman, RD TI Nucleosynthesis in massive stars and galactic chemical evolution. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Nucl Theory & Modeling Grp L414, Livermore, CA 94551 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 130-NUCL BP U22 EP U22 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300130 ER PT J AU Hofmann, AD Liang, LY AF Hofmann, AD Liang, LY TI Influence of surface speciation on the release of dissolved iron and ferrihydrite colloids from porous media. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Swiss Fed Inst Technol, Inst Terr Ecol, CH-8952 Schlieren, Switzerland. Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. RI Liang, Liyuan/O-7213-2014 OI Liang, Liyuan/0000-0003-1338-0324 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 201-ENVR BP U348 EP U348 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201823 ER PT J AU Holler, HF Yusupov, MM Yusupova, GZ Earnest, TN Cate, JH AF Holler, HF Yusupov, MM Yusupova, GZ Earnest, TN Cate, JH TI X-ray structures of functional complexes of the 70S ribosome. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Santa Cruz, Sinsheimer Labs, Ctr Mol Biol, Santa Cruz, CA 95064 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Macromol Crystallography Facil, Adv Light Source, Berkeley, CA 94720 USA. MIT, Whitehead Inst Biomed Res, Cambridge, MA 02139 USA. RI Yusupov, Marat/I-6126-2013; Yusupova , Gulnara/E-1877-2014 OI Yusupov, Marat/0000-0001-5544-0597; NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 11-MEDI BP U539 EP U539 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202919 ER PT J AU Houston, JE Winter, RM AF Houston, JE Winter, RM TI Interfacial Force Microscopy: Application to polymer surfaces. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Surface & Interface Sci Dept, Albuquerque, NM 87185 USA. S Dakota Sch Mines & Technol, Dept Chem & Chem Engn, Rapid City, SD USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 245-POLY BP U291 EP U291 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091301644 ER PT J AU Hubler, TL Bryan, SA Seliskar, CJ Heineman, WR AF Hubler, TL Bryan, SA Seliskar, CJ Heineman, WR TI Selective ion-exchange films for technetium sensors. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Richland, WA 99352 USA. Univ Cincinnati, Dept Chem, Cincinnati, OH 45221 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 51-IEC BP U420 EP U420 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202228 ER PT J AU Iglesia, E Chen, KD Argyle, MD Xie, SB Bell, AT AF Iglesia, E Chen, KD Argyle, MD Xie, SB Bell, AT TI Oxidative reactions of alkanes on supported oxide domains: Structural requirements and reaction pathways. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Lawrence Berkeley Natl Lab, Div Chem & Mat Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA. RI Argyle, Morris/A-8702-2009; Argyle, Morris/D-4952-2013 OI Argyle, Morris/0000-0001-9430-9145 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 227-COLL BP U260 EP U260 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201363 ER PT J AU Im, HJ Waezsada, SD Barnes, CE Dai, S Xue, ZL AF Im, HJ Waezsada, SD Barnes, CE Dai, S Xue, ZL TI Dithioethercarboxylate funtionalized sol-gels for mercury (II) separation. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Chem Technol Div, Oak Ridge, TN USA. RI Dai, Sheng/K-8411-2015 OI Dai, Sheng/0000-0002-8046-3931 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 351-INOR BP U505 EP U505 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202717 ER PT J AU Irvin, JA Hasselbrink, EF Hunter, MC Even, WR AF Irvin, JA Hasselbrink, EF Hunter, MC Even, WR TI Microscale electroosmotic mobility determination using streaming current measurements. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Dept Chem Mat, Livermore, CA 94551 USA. Sandia Natl Labs, Microtechnol Dept, Livermore, CA 94551 USA. RI Irvin, Jennifer/C-7968-2013 OI Irvin, Jennifer/0000-0003-3500-8419 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 186-COLL BP U254 EP U254 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201322 ER PT J AU Ivanov, IN Dabestani, RT Sigman, M AF Ivanov, IN Dabestani, RT Sigman, M TI Fluorescence decay studies of anisotropic rotations of pybuto-probe (chemisorbed and physically adsorbed) on the surface of CabOSil in solvent free environment. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RI ivanov, ilia/D-3402-2015 OI ivanov, ilia/0000-0002-6726-2502 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 183-COLL BP U254 EP U254 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201319 ER PT J AU Ivanov, IN Dabestani, R Meador, MA AF Ivanov, IN Dabestani, R Meador, MA TI Transient study of the excited states dynamics of light-induced intramolecular hydrogen abstraction in 2,5-dibenzoyl-p-xylene. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RI ivanov, ilia/D-3402-2015 OI ivanov, ilia/0000-0002-6726-2502 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 181-COLL BP U253 EP U253 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201317 ER PT J AU Jean, YC Zhang, RW Chen, HM Mallon, P Zhang, JJ Li, Y Huang, CM Sandreczki, TC Richardson, J Suzuki, R Ohdaira, T Nielsen, B AF Jean, YC Zhang, RW Chen, HM Mallon, P Zhang, JJ Li, Y Huang, CM Sandreczki, TC Richardson, J Suzuki, R Ohdaira, T Nielsen, B TI Photo-degradation of polymeric coatings studied by positron annihilation spectroscopy. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Missouri, Kansas City, MO 64110 USA. Electrotech Labs, Sakura, Ibaraki 305, Japan. Brookhaven Natl Labs, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 143-PMSE BP U350 EP U350 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091302008 ER PT J AU Ji, HF Dabestani, R Brown, GM AF Ji, HF Dabestani, R Brown, GM TI Supramolecular fluorescent probe switched by protons to detect cesium and potassium ions mimics the function of an integrated logic gate. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 521-ORGN BP U116 EP U116 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300686 ER PT J AU John, SG Ruggiero, CE Hersman, LE Neu, MP AF John, SG Ruggiero, CE Hersman, LE Neu, MP TI Siderophore-mediated plutonium uptake by the common soil aerobe Aureobacterium flavescens (JG-9). SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 351-ENVR BP U371 EP U371 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201973 ER PT J AU John, SG Gladden, PD Kenney, EP Johnson, MT Ruggiero, CE Hersman, LE Vanderberg, LA Neu, MP AF John, SG Gladden, PD Kenney, EP Johnson, MT Ruggiero, CE Hersman, LE Vanderberg, LA Neu, MP TI Metal toxicity in Deinococcus radiodurans. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 316-ENVR BP U365 EP U365 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201938 ER PT J AU John, SG Ruggiero, CE Hersman, LE Neu, MP AF John, SG Ruggiero, CE Hersman, LE Neu, MP TI Actinide interactions with Aureobacterium flavescens and Deinococcus radiodurans. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87544 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 484-INOR BP U524 EP U524 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202845 ER PT J AU Johnson, MT He, L Chitwood, DJ Vanderberg, LA Neu, MP AF Johnson, MT He, L Chitwood, DJ Vanderberg, LA Neu, MP TI Interactions of microbial exopolymers and whole cells with actinides. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Chem Sci & Technol, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 350-ENVR BP U370 EP U371 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201972 ER PT J AU Johnson, MT Ruggiero, CE Matonic, JH Reilly, SD Neu, MP AF Johnson, MT Ruggiero, CE Matonic, JH Reilly, SD Neu, MP TI Interactions of plutonium with desferrioxamine siderophores. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 315-ENVR BP U365 EP U365 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201937 ER PT J AU Kay, BD Smith, RS Kimmel, GA Dohnalek, Z Ayotte, P Stevenson, KP AF Kay, BD Smith, RS Kimmel, GA Dohnalek, Z Ayotte, P Stevenson, KP TI Amorphous ice as a model for supercooled liquid water. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 111-PHYS BP U172 EP U172 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300929 ER PT J AU Kim, C Zhou, QH Deng, BL Thornton, EC AF Kim, C Zhou, QH Deng, BL Thornton, EC TI Chromium(VI) reduction by hydrogen sulfide in the aqueous phase. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 New Mexico Inst Min & Technol, Dept Environm Engn, Socorro, NM 87801 USA. Pacific NW Natl Lab, Field Hydrol & Chem Grp, Richland, WA USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 355-ENVR BP U371 EP U371 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201977 ER PT J AU Kirbach, UW Gregorich, KE Ninov, V Folden, CM Ginter, TN Lee, DM Patin, JB Shaughnessy, DA Strellis, DA Sudowe, R Wilk, PA Zielinski, PM Hoffman, DC Nitsche, H AF Kirbach, UW Gregorich, KE Ninov, V Folden, CM Ginter, TN Lee, DM Patin, JB Shaughnessy, DA Strellis, DA Sudowe, R Wilk, PA Zielinski, PM Hoffman, DC Nitsche, H TI New interface for heavy elements studies at the Berkeley Gas-filled Separator. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Chem, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Dept Nucl Engn, Berkeley, CA USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 163-NUCL BP U27 EP U27 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300163 ER PT J AU Kirbach, UW Gregorich, KE Ninov, V Folden, CM Ginter, TN Lee, DM Patin, JB Shaughnessy, DA Strellis, DA Sudowe, R Wilk, PA Zielinski, PM Hoffman, DC Nitsche, H AF Kirbach, UW Gregorich, KE Ninov, V Folden, CM Ginter, TN Lee, DM Patin, JB Shaughnessy, DA Strellis, DA Sudowe, R Wilk, PA Zielinski, PM Hoffman, DC Nitsche, H TI New interface for heavy elements studies at the Berkeley Gas-filled Separator. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 28-NUCL BP U7 EP U7 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300029 ER PT J AU Knill, E AF Knill, E TI Controlling noise in quantum systems. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 205-PHYS BP U185 EP U185 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091301023 ER PT J AU Koehler, PE Harvey, JA Raman, S Guber, KH Winters, RR Becker, JA AF Koehler, PE Harvey, JA Raman, S Guber, KH Winters, RR Becker, JA TI Measurements of the astrophysical rates for the Pt-192,Pt-194,Pt-195,Pt-196(n,gamma) reactions. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Computat Phys & Engn Div, Oak Ridge, TN 37831 USA. Denison Univ, Dept Phys & Astron, Granville, OH 43023 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 69-NUCL BP U13 EP U13 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300070 ER PT J AU Kreek, SA Romine, WA Wong, JL Wang, TF Nagle, RJ Parker, WE Buckley, WM Mauger, GJ Lavietes, AD Ruhter, WD AF Kreek, SA Romine, WA Wong, JL Wang, TF Nagle, RJ Parker, WE Buckley, WM Mauger, GJ Lavietes, AD Ruhter, WD TI High-resolution gamma-ray spectrometer and a general radionuclide assay system for Comprehensive Test Ban Treaty on-site inspections. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Analyt & Nuclear Chem Div, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 105-NUCL BP U18 EP U18 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300105 ER PT J AU Krumper, JR Hay, PJ Martin, RL Bergman, RG AF Krumper, JR Hay, PJ Martin, RL Bergman, RG TI Synthesis, reactivity, and theoretical studies of cationic Re(III) methyl and hydrido methylene complexes. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94702 USA. Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 521-INOR BP U530 EP U530 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202882 ER PT J AU Kwei, GH Trouw, F King, HF AF Kwei, GH Trouw, F King, HF TI Dynamics of methane trapped in fullerene interstices. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM USA. Sandia Natl Lab, Livermore, CA 94550 USA. SUNY Buffalo, Buffalo, NY 14260 USA. RI Lujan Center, LANL/G-4896-2012 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 301-PHYS BP U200 EP U200 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091301119 ER PT J AU Kwei, GH Billinge, SJL AF Kwei, GH Billinge, SJL TI Atomic pair correlations in solids. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA. Michigan State Univ, Ctr Fundamental Mat Res, E Lansing, MI 48824 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 23-PHYS BP U159 EP U159 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300842 ER PT J AU Landkamer, LL Honeyman, BD Figueroa, LA Dodge, CJ Francis, AJ AF Landkamer, LL Honeyman, BD Figueroa, LA Dodge, CJ Francis, AJ TI Effects of cell structure and environmental parameters on sorption of heavy metals to bacteria: An experimental and modeling study. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Colorado Sch Mines, Golden, CO 80401 USA. Colorado Sch Mines, Environm Sci & Engn Div, Golden, CO 80401 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 371-ENVR BP U374 EP U374 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201993 ER PT J AU Lascola, R Livingston, RR McCarty, JE Dunning, JL Andrus, DB Nguyen, BV AF Lascola, R Livingston, RR McCarty, JE Dunning, JL Andrus, DB Nguyen, BV TI Use of online fiber optic colorimeter systems for process measurements in nuclear facilities at the Savannah River Site. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Westinghouse Savannah River Co, Savannah River Technol Ctr, Aiken, SC 29808 USA. Westinghouse Savannah River Co, Nucl Mat Stabilizat & Storage, Aiken, SC USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 74-NUCL BP U14 EP U14 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300075 ER PT J AU Lascola, R Livingston, RR Sanders, MA McCarty, JE Dunning, JL AF Lascola, R Livingston, RR Sanders, MA McCarty, JE Dunning, JL TI On-line spectrophotometric measurements of uranium and acid concentrations for Savannah River Site's H-canyon. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Westinghouse Savannah River Co, Savannah River Technol Ctr, Aiken, SC 29808 USA. Westinghouse Savannah River Co, Nucl Mat Stabilizat & Storage, Aiken, SC 29808 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 24-NUCL BP U6 EP U6 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300025 ER PT J AU Laue, CA AF Laue, CA TI Chemical approaches to explore the properties of the heavier transactinides. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, CMS, ANCD, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 27-NUCL BP U7 EP U7 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300028 ER PT J AU LaVerne, JA Tandon, L AF LaVerne, JA Tandon, L TI Hydrogen production in the radiolysis of absorbed water. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Notre Dame, Radiat Lab, Notre Dame, IN 46556 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM USA. NR 0 TC 0 Z9 0 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 400-PHYS BP U214 EP U214 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091301218 ER PT J AU Leber, RE AF Leber, RE TI Preparing the next generation of scientists and engineers at Department of Energy Laboratories. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Lab Univ Programs, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 96-NUCL BP U17 EP U17 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300096 ER PT J AU Levinger, NE Luther, BM Herwig, KW Bordallo, H AF Levinger, NE Luther, BM Herwig, KW Bordallo, H TI Exploring dynamics in water/DMSO mixtures using quasielastic neutron scattering and ultrafast spectroscopy. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Colorado State Univ, Dept Chem, Ft Collins, CO 80523 USA. Argonne Natl Lab, IPNS, Argonne, IL 60439 USA. RI Herwig, Kenneth/F-4787-2011; Bordallo, Heloisa/I-6836-2012 OI Bordallo, Heloisa/0000-0003-0750-0553 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 58-PHYS BP U164 EP U164 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300877 ER PT J AU Lewis, FD Wasielewski, MR AF Lewis, FD Wasielewski, MR TI Dynamics of electron transfer in synthetic DNA hairpins. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Northwestern Univ, Dept Chem, Evanston, IL 60208 USA. Northwestern Univ, Evanston, IL USA. Argonne Natl Lab, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 291-INOR BP U497 EP U497 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202657 ER PT J AU Li, DQ AF Li, DQ TI Polymer-oxide interface: Structure and property of macromolecular self-assembly. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, MST STC, MS G 755, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 249-COLL BP U264 EP U264 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201384 ER PT J AU Li, DQ AF Li, DQ TI Nanoporous polymers for controlled absorption and release of organic molecules. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, MST, STC, MS G755, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 254-PMSE BP U366 EP U366 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091302119 ER PT J AU Liu, CX Kota, S Zachara, JM Fredrickson, J AF Liu, CX Kota, S Zachara, JM Fredrickson, J TI Kinetic study of goethite bioreduction by an iron reducing bacterium. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Richland, WA 99352 USA. Pacific NW Natl Lab, Dept Microbiol, Richland, WA USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 197-ENVR BP U347 EP U347 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201819 ER PT J AU Liu, SH Miller, AD Gaffney, KJ Harris, CB AF Liu, SH Miller, AD Gaffney, KJ Harris, CB TI Ultrafast study of 2D electron solvation by methanol on Ag(111) surface. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, E O Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 199-COLL BP U256 EP U256 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201335 ER PT J AU Loy, DA Baugher, C Sanchez, A Schneider, DA Krause, F AF Loy, DA Baugher, C Sanchez, A Schneider, DA Krause, F TI Sol-gel chemistry of 3-isocyanatopropyltriethoxysilane. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RI Loy, Douglas/D-4847-2009 OI Loy, Douglas/0000-0001-7635-9958 NR 0 TC 0 Z9 0 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 152-COLL BP U248 EP U248 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201288 ER PT J AU Loy, DA Gara, D AF Loy, DA Gara, D TI Sol-gel chemistry of epoxy-functionalized organotrialkoxysilanes. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RI Loy, Douglas/D-4847-2009 OI Loy, Douglas/0000-0001-7635-9958 NR 0 TC 0 Z9 0 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 153-COLL BP U249 EP U249 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201289 ER PT J AU Loy, DA Rahimian, K Gara, D Minke, M Schneider, DA Sanchez, A Baugher, C Baugher, BM AF Loy, DA Rahimian, K Gara, D Minke, M Schneider, DA Sanchez, A Baugher, C Baugher, BM TI Polymerization chemistry of functionalized organotrialkoxysilanes. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. Sandia Natl Labs, Organ Mat Dept, Albuquerque, NM 87185 USA. RI Loy, Douglas/D-4847-2009 OI Loy, Douglas/0000-0001-7635-9958 NR 0 TC 0 Z9 0 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 403-INOR BP U513 EP U513 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202767 ER PT J AU Lugo, JL AF Lugo, JL TI Waste minimization through electrolytic decontamination of gloveboxes. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 8-TECH BP U211 EP U211 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201074 ER PT J AU Majidi, V AF Majidi, V TI True elemental speciation in gaseous specimen analysis through brute simplicity: Pulsed glow discharge mass spectrometry. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 154-ANYL BP U101 EP U101 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091200481 ER PT J AU Manaa, MR AF Manaa, MR TI New energy rich molecular systems: From N-10 to N-60. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate, L 282, Livermore, CA 94551 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 65-COMP BP U286 EP U286 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201516 ER PT J AU Manaa, MR AF Manaa, MR TI Predissociation in the hydrocarbon flame bands of HCO. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 257-PHYS BP U193 EP U193 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091301075 ER PT J AU Manaa, MR Margetis, D Elstner, M Kaxiras, E AF Manaa, MR Margetis, D Elstner, M Kaxiras, E TI Chemical reactivity of energetic materials under extreme conditions. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Harvard Univ, Div Engn & Appl Sci, Cambridge, MA 02138 USA. Univ Gesamthsch Paderborn, D-4790 Paderborn, Germany. Harvard Univ, Dept Phys, Div Engn & Appl Sci, Cambridge, MA 02138 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 109-PHYS BP U171 EP U171 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300927 ER PT J AU Margetis, D Elstner, M Manaa, MR Kaxiras, E AF Margetis, D Elstner, M Manaa, MR Kaxiras, E TI First-principles and semi-empirical electronic-structure calculations for high-pressure phases of nitromethane. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Harvard Univ, Div Engn & Appl Sci, Lyman Lab Phys, Cambridge, MA 02138 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA USA. Univ GH, Dept Mol Biophys, Paderborn, Germany. German Canc Res Ctr, D-6900 Heidelberg, Germany. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 5-PHYS BP U156 EP U156 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300824 ER PT J AU Markowitz, SS AF Markowitz, SS TI Seymour Katcoff: Inspiration for Summer Students. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, LBNL, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 159-NUCL BP U26 EP U26 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300160 ER PT J AU Martin, RL John, KD Baker, RT Sattelberger, AP Green, JC AF Martin, RL John, KD Baker, RT Sattelberger, AP Green, JC TI On the structure of Rh(allyl)(3) and Ir(allyl)(3). SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM USA. Univ Calif Los Alamos Natl Lab, Div Chem, Los Alamos, NM USA. Univ Oxford, Inorgan Chem Lab, Oxford, England. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 254-INOR BP U491 EP U492 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202620 ER PT J AU McMorrow, D Melinger, JS Kleiman, VD Lotshaw, WT Thantu, N Loughnane, BJ Farrer, RA Fourkas, JT AF McMorrow, D Melinger, JS Kleiman, VD Lotshaw, WT Thantu, N Loughnane, BJ Farrer, RA Fourkas, JT TI Analysis of intermolecular coordinate contributions to the ultrafast third-order spectroscopy of liquids. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN, Res Lab, Washington, DC 20375 USA. Gen Elec Res & Dev Ctr, Schenectady, NY USA. Idaho Natl Engn & Environm Lab, Idaho Falls, ID USA. Boston Coll, Eugene F Merkert Chem Ctr, Chestnut Hill, MA 02167 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 198-PHYS BP U184 EP U185 PN 2 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091301016 ER PT J AU McPherson, DW Knapp, FF AF McPherson, DW Knapp, FF TI Utility of a "dual-labeled E-/Z-RR-IQNP cocktail" as a novel in vivo tool for the independent evaluation of cerebral muscarinic receptor M1 and M2 subtype density and viability in a rat. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Nucl Med Grp, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 160-MEDI BP U565 EP U565 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091203068 ER PT J AU Miley, HS Arthur, RJ Warner, RA AF Miley, HS Arthur, RJ Warner, RA TI Automatic monitoring system for radioactive aerosols. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 118-NUCL BP U20 EP U20 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300118 ER PT J AU Minke, M Loy, DA AF Minke, M Loy, DA TI Sol-gel chemistry of methacryloxy- and styryl-functionalized organotrialkoxysilanes. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RI Loy, Douglas/D-4847-2009 OI Loy, Douglas/0000-0001-7635-9958 NR 0 TC 0 Z9 0 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 141-COLL BP U247 EP U247 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201277 ER PT J AU Mirzadeh, S Kennel, SJ Brechbiel, MW AF Mirzadeh, S Kennel, SJ Brechbiel, MW TI In vivo radionuclide generators: Pb-212/Bi-212 and Ac-225/Bi-213 systems. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Life Sci, Oak Ridge, TN 37831 USA. NIH, Chem Sect, Radiat Oncol Branch, Bethesda, MD USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 164-NUCL BP U27 EP U27 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300164 ER PT J AU Mitchell, JF Osborn, R Gray, KE Berger, A Argyriou, DN Bader, SD Ling, C Millburn, JE Sinha, S Seeck, O Vasiliu-Doloc, L Lynn, J AF Mitchell, JF Osborn, R Gray, KE Berger, A Argyriou, DN Bader, SD Ling, C Millburn, JE Sinha, S Seeck, O Vasiliu-Doloc, L Lynn, J TI Neutron scattering investigations of magnetism and structure in layered perovskite manganites SrO(La1-xSrxMnO3)(2). SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA. RI Ling, Chris D/B-2228-2009; Osborn, Raymond/E-8676-2011; Bader, Samuel/A-2995-2013; Berger, Andreas/D-3706-2015 OI Ling, Chris D/0000-0003-2205-3106; Osborn, Raymond/0000-0001-9565-3140; Berger, Andreas/0000-0001-5865-6609 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 24-PHYS BP U159 EP U159 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300843 ER PT J AU Moller, P Sierk, AJ Iwamoto, A AF Moller, P Sierk, AJ Iwamoto, A TI Entrance channel properties in cold and hot fusion reactions. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Japan Atom Energy Res Inst, Dept Mat Sci, Tokai, Ibaraki, Japan. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 75-NUCL BP U14 EP U14 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300076 ER PT J AU Moody, KJ Grant, PM Hutcheon, ID AF Moody, KJ Grant, PM Hutcheon, ID TI Nuclear forensic analysis of uranium samples. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Analyt & Nucl Chem Div, Livermore, CA 94550 USA. Univ Calif Lawrence Livermore Natl Lab, Forens Sci Ctr, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 60-NUCL BP U11 EP U12 PN 2 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300061 ER PT J AU Moore, DS Buelow, SJ Funk, DJ Rabie, RL Fisher, GL Gahagan, KT Reho, JH Davis, LL Sheffield, SA Brand, HV AF Moore, DS Buelow, SJ Funk, DJ Rabie, RL Fisher, GL Gahagan, KT Reho, JH Davis, LL Sheffield, SA Brand, HV TI High explosive reaction chemistry via ultrafast laser excited spectroscopies (hercules). SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Dynam Expt Div, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 106-PHYS BP U171 EP U171 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300924 ER PT J AU Myneni, SCB Waychunas, GA Traina, SJ Brown, GE AF Myneni, SCB Waychunas, GA Traina, SJ Brown, GE TI Molecular investigation of sulfate compexation on Fe-oxide surfaces. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. Ohio State Univ, Sch Nat Resources, Columbus, OH 43210 USA. Stanford Univ, Surface & Aqueous Geochem Grp, Stanford, CA 94305 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 178-ENVR BP U344 EP U344 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201800 ER PT J AU Neuforge, CML Guzik, JA Young, AC Epstein, RI AF Neuforge, CML Guzik, JA Young, AC Epstein, RI TI Solar models: Helioseismic comparisons vs. the solar neutrino problem. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Appl Theoret Phys, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Nonproliferat & Int Secur Div, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 41-NUCL BP U9 EP U9 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300042 ER PT J AU Newton, MD AF Newton, MD TI Mechanistic analysis of long-range electron transfer: Probes from computational chemistry. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 37-INOR BP U450 EP U450 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202402 ER PT J AU Newton, MD AF Newton, MD TI Mechanistic analysis of electron transfer kinetics: The role of theory and computation. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 21-COLL BP U229 EP U229 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201157 ER PT J AU Nitsche, H AF Nitsche, H TI Actinides and the environment: The challenge for interdisciplinary research. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Glenn T Seaborg Ctr, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 30-NUCL BP U7 EP U7 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300031 ER PT J AU Norman, EB AF Norman, EB TI K-12 science education and nuclear science literacy. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 95-NUCL BP U17 EP U17 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300095 ER PT J AU Nyman, M Nenoff, TM Bonhomme, F Teter, DM Maxwell, RS Xu, HW AF Nyman, M Nenoff, TM Bonhomme, F Teter, DM Maxwell, RS Xu, HW TI Synthesis, characterization, and calorimetric studies of A(2)TISI(6)O(15) (A = Na, K, Cs). SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. Sandia Natl Labs, Dept Geochem, Albuquerque, NM USA. Univ Calif Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate, Livermore, CA 94550 USA. Univ Calif Davis, Davis, CA 95616 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 538-INOR BP U533 EP U533 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202899 ER PT J AU Ogunsola, OM Ramer, ER Smith, DH AF Ogunsola, OM Ramer, ER Smith, DH TI Analysis of viscous fingering in two-dimensional flow cell by fractal dimension. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Morgantown Energy Technol Ctr, Morgantown, WV 26507 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 83-FUEL BP U397 EP U397 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202113 ER PT J AU Ogunsola, OM Lai, RW AF Ogunsola, OM Lai, RW TI GBPO model for simulation of oil shale extraction. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Natl Energy Technol Lab, Morgantown, WV 26507 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 31-PETR BP U143 EP U143 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300775 ER PT J AU Oldenburg, CM Pruess, K Benson, SM AF Oldenburg, CM Pruess, K Benson, SM TI Process modeling of CO2 injection into natural gas reservoirs for carbon sequestration and enhanced gas recovery. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Lawrence Berkeley Natl Lab, Div Earth Sci, Berkeley, CA 94720 USA. RI Oldenburg, Curtis/L-6219-2013 OI Oldenburg, Curtis/0000-0002-0132-6016 NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 71-FUEL BP U396 EP U396 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202101 ER PT J AU Oldham, SM Schake, AR Morgan, AN Scott, BL Watkin, JG Warner, BP AF Oldham, SM Schake, AR Morgan, AN Scott, BL Watkin, JG Warner, BP TI Actinide complexes containing fluorinated amido ligands. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Nucl Mat Technol, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Div Chem Sci & Technol, Los Alamos, NM USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 396-INOR BP U512 EP U512 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202760 ER PT J AU Oldham, WJ Costa, DA Scott, BL Abney, KD Smith, WH AF Oldham, WJ Costa, DA Scott, BL Abney, KD Smith, WH TI Actinide chemistry in air and water stable room temperature ionic liquids. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Nucl Mat Technol, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Div Chem Sci & Technol, Los Alamos, NM USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 394-INOR BP U511 EP U511 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202758 ER PT J AU Omberg, KM Freyer, JP Schoonover, JR AF Omberg, KM Freyer, JP Schoonover, JR TI Raman spectroscopy of tumorigenic cells. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. RI Omberg, Kristin/I-5972-2013 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 107-ANYL BP U94 EP U95 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091200434 ER PT J AU Orme, CJ Stewart, FF Stone, ML AF Orme, CJ Stewart, FF Stone, ML TI Time lag determination and permeability measurement on a series of tri-substituted phosphazene polymers. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 14-TECH BP U212 EP U212 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201080 ER PT J AU Otto, RJ AF Otto, RJ TI "A nation at risk" public policy and back to basics. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Lawrence Berkeley Natl Lab, Ctr Sci & Engn Educ, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 99-NUCL BP U17 EP U17 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300099 ER PT J AU Otto, RJ AF Otto, RJ TI Seaborg education legacy. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Lawrence Berkeley Natl Lab, Ctr Sci & Engn Educ, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 93-NUCL BP U16 EP U16 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300092 ER PT J AU Pagoria, PF Lee, GS Mitchell, AR Schmidt, RD AF Pagoria, PF Lee, GS Mitchell, AR Schmidt, RD TI Series of substituted pyrazines and pyridines as precursors to energetic materials. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Dept Chem & Chem Engn, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 421-ORGN BP U99 EP U100 PN 2 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300586 ER PT J AU Pankow, JF Tesoriero, AJ Pavlick, A AF Pankow, JF Tesoriero, AJ Pavlick, A TI Importance of ionic solid solutions in determining metal behavior in natural waters. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oregon Grad Inst, Portland, OR 97291 USA. US Geol Survey, Div Water Resources, Washington, DC USA. Oak Ridge Natl Lab, Engn Technol Div, Oak Ridge, TN USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 352-ENVR BP U371 EP U371 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201974 ER PT J AU Parthasarathy, N Guyon, F Pelletier, M Buffle, J AF Parthasarathy, N Guyon, F Pelletier, M Buffle, J TI Analytical separation and preconcentration of trace metals by newly emerging carrier aided transport through permeation liquid membrane for free metal ion determination in natural waters. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 CABE, Dept Inorgan & Analyt Chem, CH-1211 Geneva, Switzerland. Los Alamos Natl Lab, Los Alamos, NM USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 80-ENVR BP U328 EP U328 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201702 ER PT J AU Patello, GK Bliss, M Bryant, JL Lipton, MS O'Neil, LR AF Patello, GK Bliss, M Bryant, JL Lipton, MS O'Neil, LR TI Lactation support program at the Pacific Northwest National Laboratory. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RI Bliss, Mary/G-2240-2012 OI Bliss, Mary/0000-0002-7565-4813 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 18-CHAS BP U190 EP U190 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091200971 ER PT J AU Pennebaker, FM Sigg, R Spencer, WA Whitaker, MJ DiPrete, DP McCabe, D Hart, JC AF Pennebaker, FM Sigg, R Spencer, WA Whitaker, MJ DiPrete, DP McCabe, D Hart, JC TI On-line process monitoring of technetium in Hanford radioactive waste. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Westinghouse Savannah River Co, Analyt Dev Sect, Aiken, SC 29808 USA. Westinghouse Savannah River Co, Savannah River Technol Ctr, Aiken, SC 29808 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 22-NUCL BP U6 EP U6 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300023 ER PT J AU Perahia, D Traiphol, R Smith, DW Felcher, G AF Perahia, D Traiphol, R Smith, DW Felcher, G TI Effects of low surface energy polymeric thin films on the orientation of LC molecules. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Clemson Univ, Dept Chem, M S & E Program, Clemson, SC 29635 USA. Clemson Univ, Dept Chem, Clemson, SC 29634 USA. Argonne Natl Lab, Div Mat, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 297-COLL BP U271 EP U271 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201431 ER PT J AU Phillips, J Chen, CK Gleiman, S Shim, H AF Phillips, J Chen, CK Gleiman, S Shim, H TI Microwave plasma torch production of supported metal particles. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Engn Sci & Applicat Div, Los Alamos, NM 87545 USA. Penn State Univ, Dept Chem Engn, University Pk, PA 16802 USA. RI Phillips, Jonathan/D-3760-2011 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 5-CATL BP U388 EP U388 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091302218 ER PT J AU Plasynski, SI Chen, ZY AF Plasynski, SI Chen, ZY TI Review of CO2 capture technologies and some improvement opportunities. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Natl Energy Technol Ctr, Power & Environm Syst Div, Pittsburgh, PA 15236 USA. Sci Applicat Int Corp, Mclean, VA 22102 USA. NR 0 TC 2 Z9 2 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 41-FUEL BP U391 EP U391 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202072 ER PT J AU Polson, LA Stone, ML Gresham, GL AF Polson, LA Stone, ML Gresham, GL TI Membrane Introduction Mass Spectroscopy (MIMS): An overview of system components and variables. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 11-TECH BP U211 EP U211 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201077 ER PT J AU Porter, MD Harnisch, J Hu, ZM Takano, H Gazda, D Keller, D AF Porter, MD Harnisch, J Hu, ZM Takano, H Gazda, D Keller, D TI Selectivity manipulation of separation by electrochemically-modulated liquid chromatography (EMLC). SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Iowa State Univ Sci & Technol, Ames Lab, US DOE, Dept Chem,Microanalyt Instrumentat Ctr, Ames, IA 50011 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 170-ANYL BP U103 EP U104 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091200497 ER PT J AU Powell, B Thompson, MC Navratil, JD AF Powell, B Thompson, MC Navratil, JD TI Uranium dibutyl phosphate chemistry. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Clemson Univ, Anderson, SC 29625 USA. Savannah River Technol Ctr, Actinide Technol Sect, Aiken, SC USA. RI Powell, Brian /C-7640-2011 OI Powell, Brian /0000-0003-0423-0180 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 52-IEC BP U420 EP U420 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202229 ER PT J AU Rahimian, K Lang, DP Loy, DA AF Rahimian, K Lang, DP Loy, DA TI Polysilsesquioxanes through base-catalyzed redistribution of oligomethylhydridosiloxanes. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Mat Organ Dept, Albuquerque, NM 87185 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RI Loy, Douglas/D-4847-2009 OI Loy, Douglas/0000-0001-7635-9958 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 144-POLY BP U276 EP U276 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091301543 ER PT J AU Redden, GD LaViolette, RA AF Redden, GD LaViolette, RA TI Evaluation of the mass action expression coefficients for multidentate complexation on mineral surfaces. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83404 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 181-ENVR BP U345 EP U345 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201803 ER PT J AU Redden, GD LaViolette, RA AF Redden, GD LaViolette, RA TI Evaluation of the mass action expression coefficients for multidentate complexation on mineral surfaces. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83404 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 97-COLL BP U240 EP U240 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201233 ER PT J AU Reddy, CM Drenzek, NJ Heraty, LJ Sturchio, NC Eglinton, TI AF Reddy, CM Drenzek, NJ Heraty, LJ Sturchio, NC Eglinton, TI TI Intramolecular stable chlorine isotope effects from the abiotic dehydrochlorination of DDT. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Woods Hole Oceanog Inst, Dept Marine Chem & Geochem, Woods Hole, MA 02543 USA. Argonne Natl Lab, Environm Res Grp, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 93-ENVR BP U330 EP U330 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201715 ER PT J AU Redondo, A Salazar, MR Kress, JD AF Redondo, A Salazar, MR Kress, JD TI Theoretical studies of epoxidation on silver clusters. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Grp T12, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 130-PHYS BP U174 EP U174 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300948 ER PT J AU Reeder, PL Bowyer, TW McIntyre, JI Pitts, WK AF Reeder, PL Bowyer, TW McIntyre, JI Pitts, WK TI Identification of Xe fission product isotopes by beta-gamma coincidence counting for CTBT. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RI McIntyre, Justin/P-1346-2014 OI McIntyre, Justin/0000-0002-3706-4310 NR 0 TC 0 Z9 0 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 102-NUCL BP U17 EP U18 PN 2 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300102 ER PT J AU Reisinger, A Pecka, J Jindrich, J Miller, JR Kirby, JP Pospisil, L Michl, J AF Reisinger, A Pecka, J Jindrich, J Miller, JR Kirby, JP Pospisil, L Michl, J TI Synthesis and properties of thiol-terminated pyridinium wires. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA. Charles Univ, Dept Organ Chem, Prague, Czech Republic. Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. Acad Sci Czech Republ, J Heyrovsky Inst Phys Chem & Electrochem, Dept Phys Chem, Prague, Czech Republic. RI Jindrich, Jindrich/A-3527-2008; Pospisil, Lubomir/F-5195-2014; Michl, Josef/G-9376-2014 OI Jindrich, Jindrich/0000-0003-3770-0214; NR 0 TC 0 Z9 0 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 300-COLL BP U271 EP U271 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201434 ER PT J AU Rempe, SB Pratt, LR AF Rempe, SB Pratt, LR TI Function and selectivity of ion channels. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RI Pratt, Lawrence/H-7955-2012 OI Pratt, Lawrence/0000-0003-2351-7451 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 49-PHYS BP U163 EP U163 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300868 ER PT J AU Rempe, SB Pratt, LR AF Rempe, SB Pratt, LR TI Theory of function and selectivity of ion channels. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RI Pratt, Lawrence/H-7955-2012 OI Pratt, Lawrence/0000-0003-2351-7451 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 11-NUCL BP U4 EP U4 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300012 ER PT J AU Retsek, JL Gentemann, S Medforth, CJ Smith, KM Chirvony, VS Fajer, J Holten, D AF Retsek, JL Gentemann, S Medforth, CJ Smith, KM Chirvony, VS Fajer, J Holten, D TI Picosecond photoinduced conformational dynamics in the (1)(pi,pi*) excited state of a nonplanar porphyrin. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Washington Univ, Dept Chem, St Louis, MO 63130 USA. Natl Acad Sci Belarus, Inst Mol & Atom Phys, Minsk, Byelarus. Brookhaven Natl Lab, Dept Appl Sci, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 231-PHYS BP U189 EP U189 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091301049 ER PT J AU Reynolds, JG Baumann, TF Nelson, AJ Fox, GA AF Reynolds, JG Baumann, TF Nelson, AJ Fox, GA TI Synthesis and characterization of polymer bound thiacrowns used for environmental remediation of Hg in aqueous solutions. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Univ Calif Lawrence Livermore Natl Lab, Chem & Mat Sci Div, Livermore, CA 94551 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 86-IEC BP U425 EP U425 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202263 ER PT J AU Reynolds, JG AF Reynolds, JG TI Metals and heteroatoms in heavy crude oils. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 8-PETR BP U140 EP U140 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300756 ER PT J AU Ronquillo, R AF Ronquillo, R TI Preparation of a glovebox for casting plutonium enriched with PU238. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 3-TECH BP U210 EP U210 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201070 ER PT J AU Salaymeh, S Dewberry, R AF Salaymeh, S Dewberry, R TI HEU holdup measurements for de-activating 321-M. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Westinghouse Savannah River Co, Savannah River Technol Ctr, Aiken, SC 29808 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 10-NUCL BP U4 EP U4 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300011 ER PT J AU Salazar, MR Kress, JD Redondo, A AF Salazar, MR Kress, JD Redondo, A TI Computational studies of olefin epoxidation. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Grp T12, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 17-CATL BP U390 EP U390 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091302230 ER PT J AU Samet, AV Romanovich, AY Buchanan, AC Coughlin, DJ Gakh, AA AF Samet, AV Romanovich, AY Buchanan, AC Coughlin, DJ Gakh, AA TI Synthesis and structure of fluorinated DL-phenylalanines and arylpyruvic acids. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Amer Cyanamid Co, Wayne, NJ 07470 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 177-ORGN BP U60 EP U60 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300343 ER PT J AU Sault, AG Mudd, JE Ruffner, JA Miller, JE AF Sault, AG Mudd, JE Ruffner, JA Miller, JE TI Structurally ordered magnesium vanadate model catalysts for oxidative dehydrogenation. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Sandia Natl Labs, Catalyt & Porous Mat Dept, Albuquerque, NM 87185 USA. Sandia Natl Labs, Elect & Opt Mat Dept, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 82-COLL BP U237 EP U237 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201218 ER PT J AU Scherson, D Tolmachev, YV Stefan, IC AF Scherson, D Tolmachev, YV Stefan, IC TI Modulation techniques in in situ UV-visible spectroelectrochemistry. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Case Western Reserve Univ, Dept Chem, Cleveland, OH 44106 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 164-ANYL BP U102 EP U103 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091200491 ER PT J AU Schroeder, WD Fontenot, GJ Schrader, GL AF Schroeder, WD Fontenot, GJ Schrader, GL TI Partial oxidation of 1,3-butadiene over V-Mo-O catalysts. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Iowa State Univ, US DOE, Dept Chem Engn, Ames, IA 50011 USA. Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 259-COLL BP U265 EP U265 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201394 ER PT J AU Schultz, AJ Henning, RW Hitchman, MA Falvello, LR AF Schultz, AJ Henning, RW Hitchman, MA Falvello, LR TI Neutron diffraction studies of Jahn-Teller switches. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Argonne, IL 60439 USA. Univ Tasmania, Dept Chem, Hobart, Tas, Australia. Univ Zaragoza, Dept Inorgan Chem, Zaragoza, Spain. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 26-PHYS BP U159 EP U160 PN 2 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300845 ER PT J AU Semprini, L Vancheeswaran, S Yu, SH Chu, MY Halden, RU AF Semprini, L Vancheeswaran, S Yu, SH Chu, MY Halden, RU TI Tetraalkoxysilanes as slow release substrates to promote aerobic and anaerobic dehalogenation reactions in the subsurface. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oregon State Univ, Dept Civil Contruct & Environm Engn, Corvallis, OR 97331 USA. Univ Calif Lawrence Livermore Natl Lab, Environm Restorat Div, Livermore, CA USA. RI Halden, Rolf/F-9562-2010 OI Halden, Rolf/0000-0001-5232-7361 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 125-ENVR BP U335 EP U335 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201747 ER PT J AU Seymour, R Crawford, TW Bliss, M Craig, RA AF Seymour, R Crawford, TW Bliss, M Craig, RA TI Portable neutron and gamma-ray radiation search tool for illicit trafficking and non-proliferation applications. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 NucSafe LLC, Clinton, TN 37716 USA. Pacific NW Natl Lab, Dept Analyt Chem, Richland, WA USA. RI Bliss, Mary/G-2240-2012 OI Bliss, Mary/0000-0002-7565-4813 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 151-NUCL BP U25 EP U25 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300151 ER PT J AU Shamsi, A AF Shamsi, A TI Methane dry reforming: Effects of pressure and promoters on carbon formation. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Morgantown Energy Technol Ctr, Morgantown, WV 26505 USA. NR 0 TC 0 Z9 0 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 57-FUEL BP U394 EP U394 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202087 ER PT J AU Shaughnessy, DA Nitsche, H Serne, RJ Booth, CH Shuh, DK Waychunas, GA Gill, HS AF Shaughnessy, DA Nitsche, H Serne, RJ Booth, CH Shuh, DK Waychunas, GA Gill, HS TI Interfacial reaction studies of plutonium on manganese oxide hydroxide mineral surfaces. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Lawrence Berkeley Natl Lab, Div Chem Sci, Glenn T Seaborg Ctr, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Glenn T Seaborg Ctr, Berkeley, CA USA. Pacific NW Natl Lab, Richland, WA USA. Pacific NW Natl Lab, Div Earth Sci, Richland, WA USA. RI Booth, Corwin/A-7877-2008 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 227-ENVR BP U352 EP U352 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201849 ER PT J AU Shaugnessy, DA Gregorich, KE Adams, J Laue, CA Lane, M Lee, D McGrath, CA Patin, JB Strellis, DA Sylwester, ER Wilk, PA Hoffman, DC AF Shaugnessy, DA Gregorich, KE Adams, J Laue, CA Lane, M Lee, D McGrath, CA Patin, JB Strellis, DA Sylwester, ER Wilk, PA Hoffman, DC TI Electron-capture delayed fission properties of neutron-deficient einsteinium nuclei. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA USA. Lawrence Berkeley Natl Lab, Dept Chem, Berkeley, CA USA. Univ Calif Berkeley, Berkeley, CA 94720 USA. Lawrence Livermore Natl Lab, G T Seaborg Inst Transactinium Sci, Livermore, CA USA. Idaho Natl Engn & Environm Lab, Idaho Falls, ID USA. Lawrence Berkeley Natl Lab, Dept Nucl Engn, Berkeley, CA USA. EM dakeeney@lbl.gov RI McGrath, Christopher/E-8995-2013 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 78-NUCL BP U14 EP U15 PN 2 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300079 ER PT J AU Shaw, RW Barshick, CM Smith, DH Ramsey, JM AF Shaw, RW Barshick, CM Smith, DH Ramsey, JM TI Metal mesh sampling for glow discharge optical and mass spectrometry. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 141-NUCL BP U23 EP U23 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300141 ER PT J AU Shields, SJ Balhorn, RL AF Shields, SJ Balhorn, RL TI Characterization of tetanus toxin protein-ligand non-covalent complexes using mass spectrometry. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Biol & Biotechnol Program, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 46-ANYL BP U85 EP U86 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091200373 ER PT J AU Sigman, ME Smith, GC Ilgner, RH Jones, DC Ma, CY AF Sigman, ME Smith, GC Ilgner, RH Jones, DC Ma, CY TI Analytical chemistry of finding explosives with honeybees. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. Univ Montana, Dept Chem, Missoula, MT 59812 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 35-ANYL BP U84 EP U84 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091200362 ER PT J AU Silva, RJ AF Silva, RJ TI Summer School Programs in Nuclear and Radiochemistry at San Jose State University, Brookhaven National Laboratory and the GT Seaborg Institute for Transactinium Science at LLNL. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, GT Seaborg Inst Transactinium Sci, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 97-NUCL BP U17 EP U17 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300097 ER PT J AU Silva, RJ AF Silva, RJ TI Early studies of the chemical properties of the heaviest elements. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, GT Seaborg Inst Transactinium Sci, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 4-NUCL BP U3 EP U3 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300005 ER PT J AU Simonelli, DM Baldelli, S Schnitzer, C Shultz, MJ AF Simonelli, DM Baldelli, S Schnitzer, C Shultz, MJ TI SFG spectroscopy of the aqueous interface. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Tufts Univ, Dept Chem, Pearson Lab, Medford, MA 02155 USA. Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. Suffolk Univ, Dept Chem, Boston, MA 02108 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 41-PHYS BP U162 EP U162 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300860 ER PT J AU Siriwardane, R Shen, M Fisher, E Poston, J Smith, DH AF Siriwardane, R Shen, M Fisher, E Poston, J Smith, DH TI Adsorption of CO2 on molecular sieves and activated carbon. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Natl Energy Technol Lab, Morgantown, WV 26507 USA. NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 46-FUEL BP U392 EP U392 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202077 ER PT J AU Sloop, FV Dabestani, RT Brown, GM AF Sloop, FV Dabestani, RT Brown, GM TI Differential phase fluorimetry method for locating land mines. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RI Sloop, Jr., Frederick/J-2301-2016 OI Sloop, Jr., Frederick/0000-0001-6473-9507 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 150-NUCL BP U25 EP U25 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300150 ER PT J AU Smith, CA Martinez, MA Veirs, DK AF Smith, CA Martinez, MA Veirs, DK TI Plutonium isotopic ratios determined using laser induced breakdown spectroscopy (LIBS). SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Nucl Mat Technol, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 138-NUCL BP U23 EP U23 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300138 ER PT J AU Smith, CA Martinez, MA Veirs, DK AF Smith, CA Martinez, MA Veirs, DK TI Elemental analysis in plutonium matrices using laser induced breakdown spectroscopy (LIBS). SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Nucl Mat Technol, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 57-NUCL BP U11 EP U11 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300058 ER PT J AU Smith, DH Seshadri, KS AF Smith, DH Seshadri, KS TI Thermodynamics of conversion of methane clathrate hydrate to carbon dioxide hydrate within porous media. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Natl Energy Technol Lab, Morgantown, WV 26507 USA. Parsons Infrastruct, Library, PA USA. NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 98-FUEL BP U400 EP U400 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202128 ER PT J AU Smith, DH Ferer, M Bromhal, GS AF Smith, DH Ferer, M Bromhal, GS TI Pore-level modeling of carbon dioxide sequestration in deep aquifers. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Morgantown Energy Technol Ctr, Morgantown, WV 26507 USA. W Virginia Univ, Dept Phys, Morgantown, WV 26506 USA. Carnegie Mellon Univ, Pittsburgh, PA 15213 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 84-FUEL BP U397 EP U398 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202114 ER PT J AU Smith, MR Crawford, BA AF Smith, MR Crawford, BA TI Laser ablation ICP/MS: Qualitative and quantitative data from Hanford Site tank wastes. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 35-NUCL BP U8 EP U8 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300036 ER PT J AU Smith, MS AF Smith, MS TI Probing stellar explosions with radioactive beams at ORNL. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 127-NUCL BP U21 EP U21 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300127 ER PT J AU Smith, SC Zachara, JM AF Smith, SC Zachara, JM TI Solid/liquid re-distribution of Fe(II/III), Co(III) and Ni(II) resulting from the bioreduction of Co(III) or Ni(II) substituted hydrous ferric oxides. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 321-ENVR BP U366 EP U366 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201943 ER PT J AU Song, J Cheng, Q Stevens, R AF Song, J Cheng, Q Stevens, R TI Transmembrane lipid biomaterials as colorimetric sensors for bacterial toxins. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 167-COLL BP U251 EP U251 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201303 ER PT J AU Song, J Cheng, Q Stevens, R AF Song, J Cheng, Q Stevens, R TI Cystine-PDA derivatives: Versatile molecules in the fabrication of 'smart' self-assembling materials. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 142-COLL BP U247 EP U247 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201278 ER PT J AU Songkasiri, W Rittmann, BE Reed, DT AF Songkasiri, W Rittmann, BE Reed, DT TI Modeling inhibition and toxicity of uranium in the citrate-pseudomonas fluorescens system. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Northwestern Univ, Dept Civil Engn, Evanston, IL 60208 USA. Argonne Natl Lab, Div Chem Technol, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 317-ENVR BP U365 EP U365 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201939 ER PT J AU Soong, Y Gray, ML Link, TA Champagne, KJ Schoffstall, MR AF Soong, Y Gray, ML Link, TA Champagne, KJ Schoffstall, MR TI Separation and utilization of value-added products from combustion fly ash. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Natl Energy Technol Lab, Pittsburgh, PA 15236 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 37-FUEL BP U390 EP U390 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202068 ER PT J AU Spath, P Amos, W AF Spath, P Amos, W TI Incorporating CO2 sequestration and coal-bed methane recovery into hydrogen production from coal: Economics and environmental aspects. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 93-FUEL BP U399 EP U399 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202123 ER PT J AU Srinivasan, B Srinivasan, BC Narayanan, UI AF Srinivasan, B Srinivasan, BC Narayanan, UI TI Non-destructive assay standard for U-235 measurements. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US Dept Energy, New Brunswick Lab, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 12-NUCL BP U4 EP U4 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300013 ER PT J AU Stine, CL Alexandratos, SD Moyer, BA Sachleben, RA AF Stine, CL Alexandratos, SD Moyer, BA Sachleben, RA TI Synthesis of polymer supported 14-crown-4 and its lithium sorption capacities. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RI Solominow, Sonia/A-4021-2008; Moyer, Bruce/L-2744-2016 OI Moyer, Bruce/0000-0001-7484-6277 NR 0 TC 0 Z9 0 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 48-IEC BP U419 EP U419 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202225 ER PT J AU Stoyer, NJ Stoyer, MA Wild, JF Moody, KJ Lougheed, RW Oganessian, YT Utyonkov, VK AF Stoyer, NJ Stoyer, MA Wild, JF Moody, KJ Lougheed, RW Oganessian, YT Utyonkov, VK TI Random probability analysis of heavy element data. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Analyt & Nucl Chem Div, Livermore, CA 94550 USA. Joint Inst Nucl Res, Dubna, Russia. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 53-NUCL BP U10 EP U10 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300054 ER PT J AU Stuart, SJ Dickson, BM Noid, DW Sumpter, BG AF Stuart, SJ Dickson, BM Noid, DW Sumpter, BG TI Nanotubes as test tubes: Effect of confinement on hydrocarbon reactions. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Clemson Univ, Dept Chem, Clemson, SC 29634 USA. Oak Ridge Natl Lab, Div Chem, Oak Ridge, TN 37831 USA. RI Sumpter, Bobby/C-9459-2013 OI Sumpter, Bobby/0000-0001-6341-0355 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 161-COMP BP U301 EP U301 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201612 ER PT J AU Su, H Yeung, ES AF Su, H Yeung, ES TI High throughput screening of heterogeneous catalysts by laser-induced fluorescence imaging. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Iowa State Univ, Ames, IA 50011 USA. US DOE, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Chem, Ames, IA USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 62-IEC BP U421 EP U421 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202239 ER PT J AU Subramaniam, K Yiacoumi, S Tsouris, C AF Subramaniam, K Yiacoumi, S Tsouris, C TI Equilibria and kinetics of copper sorption and its effects on flocculation of colloidal oxide particles. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA. Oak Ridge Natl Lab, Div Chem Technol, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 276-ENVR BP U359 EP U359 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201898 ER PT J AU Subramaniam, K Yiacoumi, S Tsouris, C AF Subramaniam, K Yiacoumi, S Tsouris, C TI Copper sorption and its effects on flocculation of oxide colloids: Equilibria and rates. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA. Oak Ridge Natl Lab, Div Chem Technol, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 39-COLL BP U231 EP U231 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201175 ER PT J AU Sudowe, R Gregorich, KE Kirbach, UW Lee, DM Patin, JB Strellis, DA Wilk, PA Hoffman, DC AF Sudowe, R Gregorich, KE Kirbach, UW Lee, DM Patin, JB Strellis, DA Wilk, PA Hoffman, DC TI Application of extraction chromatography and SPE techniques to the study of the lighter transactinide elements. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Nucl Sci, Dept Chem, Berkeley, CA 94720 USA. Univ Calif, Dept Nucl Engn, Berkeley, CA USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 29-NUCL BP U7 EP U7 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300030 ER PT J AU Sykora, M Maxwell, KA Meyer, TJ AF Sykora, M Maxwell, KA Meyer, TJ TI Mimicking the antenna-electron transfer properties of photosynthesis in soluble polymer. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ N Carolina, Dept Chem, Chapel Hill, NC 27599 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 86-INOR BP U467 EP U467 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202452 ER PT J AU Tandon, L Kuhn, KJ Martinez, PM Walker, LF Temer, DJ Martinez, DJ Ryan, KJ Wilson, AG Hamada, MS AF Tandon, L Kuhn, KJ Martinez, PM Walker, LF Temer, DJ Martinez, DJ Ryan, KJ Wilson, AG Hamada, MS TI Analytical chemistry quality assessment at LANL. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 8-NUCL BP U4 EP U4 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300009 ER PT J AU Tran, JA Satcher, JH Cary, DR Zhang, CM Trudell, ML Heiss, AM Vachon, DJ Darrow, C Lane, SM AF Tran, JA Satcher, JH Cary, DR Zhang, CM Trudell, ML Heiss, AM Vachon, DJ Darrow, C Lane, SM TI Synthesis of a benzophenoxazinone boronate as a novel fluorescent glucose sensor. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 MiniMed Inc, Discovery, Sylmar, CA 91342 USA. Univ Calif Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate, Livermore, CA USA. Univ New Orleans, Dept Chem, New Orleans, LA 70148 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 237-ORGN BP U70 EP U70 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300403 ER PT J AU Trewhella, J AF Trewhella, J TI Neutron scattering reveals details of biomolecular signaling mechanisms. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Biosci Div, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 93-PHYS BP U169 EP U169 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300911 ER PT J AU Tse, JS Trouw, F Gutt, C Press, W Shpakov, V Belodludov, W AF Tse, JS Trouw, F Gutt, C Press, W Shpakov, V Belodludov, W TI Structure and dynamics of clathrate hydrates: Neutron elastic and inelastic studies. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Natl Res Council Canada, Steacie Inst Mol Sci, Ottawa, ON K1A 0R6, Canada. Univ Calif Los Alamos Natl Lab, Manuel Lujan Jr Neutron Scattering Ctr, Los Alamos, NM 87545 USA. Univ Kiel, Inst Expt & Angewandte Phys, D-24098 Kiel, Germany. Russian Acad Sci, Inst Inorgan Chem, Moscow 117901, Russia. RI Lujan Center, LANL/G-4896-2012; Gutt, Christian/H-9846-2012; Gutt, Christian/F-6337-2013 NR 0 TC 1 Z9 1 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 57-PHYS BP U164 EP U164 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300876 ER PT J AU Urbansky, ET Magnuson, ML Gu, BH Brown, GM Kelty, CA AF Urbansky, ET Magnuson, ML Gu, BH Brown, GM Kelty, CA TI Development of an electrospray mass spectrometric method for determining perchlorate in fertilizers. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US EPA, Natl Risk Management Res Lab, Cincinnati, OH 45268 USA. Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RI Gu, Baohua/B-9511-2012 OI Gu, Baohua/0000-0002-7299-2956 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 15-FERT BP U378 EP U378 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202010 ER PT J AU Urbina, JR AF Urbina, JR TI Learning to adapt in my "technical field of dreams". SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 23-TECH BP U213 EP U213 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201089 ER PT J AU Vairavamurthy, MA AF Vairavamurthy, MA TI Role of thiols and sulfide oxidation intermediates in mobilizing metals. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Brookhaven Natl Lab, Dept Environm Sci, Upton, NY 11973 USA. Univ Illinois, Mat Res Lab, Chicago, IL 60680 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 348-ENVR BP U370 EP U370 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201970 ER PT J AU Vance, AL van Buuren, TWH Baumann, TF Fox, GA AF Vance, AL van Buuren, TWH Baumann, TF Fox, GA TI Surface attached molecular loops. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Div Chem & Chem Engn, Livermore, CA 94551 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 180-COLL BP U253 EP U253 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201316 ER PT J AU Villinski, JE O'Day, P Bargar, JR Conklin, MH AF Villinski, JE O'Day, P Bargar, JR Conklin, MH TI Reductive dissolution of MnO2 by Fe(II): Effects of chemical gradients and intermediate phase structural information. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Arizona, Dept Hydrol & Water Resources, Tucson, AZ 85721 USA. Arizona State Univ, Dept Geol, Tempe, AZ 85287 USA. Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 292-ENVR BP U361 EP U361 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201914 ER PT J AU Vogel, JS Keating, GA Buchholz, B AF Vogel, JS Keating, GA Buchholz, B TI Toxic effects of chemical mixtures at relevant exposures: Minimizing analyses. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94551 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 122-AGRO BP U66 EP U66 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091200275 ER PT J AU Vogel, JS Ognibene, T Lin, YM Dueker, SR Clifford, AJ Buchholz, B AF Vogel, JS Ognibene, T Lin, YM Dueker, SR Clifford, AJ Buchholz, B TI Quantification of human metabolism and mass balance of vitamins at physiologic exposures. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94551 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 40-AGFD BP U27 EP U27 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091200041 ER PT J AU Voter, AF AF Voter, AF TI Extending atomistic simulation time scales. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 251-COLL BP U264 EP U264 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201386 ER PT J AU Wang, LQ Liu, J Shin, YS Nie, ZM Chang, JH Fryxell, GE Samuels, WD Exarhos, GJ AF Wang, LQ Liu, J Shin, YS Nie, ZM Chang, JH Fryxell, GE Samuels, WD Exarhos, GJ TI Solid-state NMR investigations of molecular assembly in ordered nanoporosities. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Dept Mat Sci, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 140-COLL BP U247 EP U247 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201276 ER PT J AU Wang, LQ Ferris, KF Herman, GS AF Wang, LQ Ferris, KF Herman, GS TI Structural influence on surface reactivity: A comparative study for small molecule adsorption onto stoichiometric and defective TIO2 and SRTIO3 surfaces. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Dept Mat Sci, Richland, WA 99352 USA. Pacific NW Natl Lab, Environm Mol Sci Labs, Richland, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 116-COLL BP U243 EP U243 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201252 ER PT J AU Ward, TE AF Ward, TE TI Neutrons, protons, and my interactions with Seymour Katcoff. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Def Programs, Tritium Program Off, Washington, DC USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 161-NUCL BP U26 EP U26 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300161 ER PT J AU Warzinski, RP Lynn, RJ Robertson, AM Halijasmaa, IJ AF Warzinski, RP Lynn, RJ Robertson, AM Halijasmaa, IJ TI Development of a high-pressure water tunnel facility for ocean CO2 storage experimentation. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Natl Energy Technol Lab, Pittsburgh, PA 15236 USA. Univ Pittsburgh, Dept Mech Engn, Pittsburgh, PA 15261 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 110-FUEL BP U401 EP U401 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202140 ER PT J AU Wayne, DM AF Wayne, DM TI Simple time-of-flight mass spectrometer for thermal ionization cavity mass spectrometry. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 39-NUCL BP U8 EP U9 PN 2 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300040 ER PT J AU Weiss, W Harms, W Sartorius, H Schlosser, C Auer, M Schulze, J Blanchard, X Carbonnelle, J Fontaine, JP Piwowarczyk, JC Thouard, M Abel, KH Bowyer, TW Hayes, JC Heimbigner, TR McIntyre, JI Panisko, ME Dubasov, YV Kazarinov, N Prelovsky, W Popov, YS Larson, T Ringbom, A AF Weiss, W Harms, W Sartorius, H Schlosser, C Auer, M Schulze, J Blanchard, X Carbonnelle, J Fontaine, JP Piwowarczyk, JC Thouard, M Abel, KH Bowyer, TW Hayes, JC Heimbigner, TR McIntyre, JI Panisko, ME Dubasov, YV Kazarinov, N Prelovsky, W Popov, YS Larson, T Ringbom, A TI International program to test and evaluate CTBT/IMS noble gas equipment. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Inst Atmospher Radioact, Fed Hlth Radiat Preotect, D-79098 Freiburg, Germany. Comprehens Test Ban Treaty Org, Provisional Tech Secretariat, Vienna, Austria. CEA DASE, Bruyeres Le Chatel, France. Pacific NW Natl Lab, Richland, WA USA. VG Khlopin Radium Inst, St Petersburg, Russia. Def Res Estab, FOA 41, Ottawa, ON, Canada. RI McIntyre, Justin/P-1346-2014 OI McIntyre, Justin/0000-0002-3706-4310 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 103-NUCL BP U18 EP U18 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300103 ER PT J AU Wellman, DM Gamerdinger, AP Kaplan, DI Serne, RJ AF Wellman, DM Gamerdinger, AP Kaplan, DI Serne, RJ TI Moisture dependency of uranium (VI) sorption in unsaturated sediments. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Washington State Univ, Dept Chem, Pullman, WA 99164 USA. Westinghouse Savannah River Co, Aiken, SC USA. Pacific NW Natl Lab, Richland, WA USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 225-ENVR BP U351 EP U352 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201847 ER PT J AU Wild, JF AF Wild, JF TI Early searches for superheavy elements. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Analyt & Nucl Chem Div, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 2-NUCL BP U3 EP U3 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300003 ER PT J AU Williams, LL Rubin, JB AF Williams, LL Rubin, JB TI Removal of polymer coatings with supercritical fluids. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Colorado State Univ, Dept Mech Engn, Ft Collins, CO 80521 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 1 Z9 1 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 133-IEC BP U432 EP U432 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202309 ER PT J AU Wolf, SF Bowers, DL AF Wolf, SF Bowers, DL TI Analysis of high burnup spent nuclear fuel using HPLC-ICPMS. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem Technol, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 71-NUCL BP U13 EP U13 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300072 ER PT J AU Wolf, SF AF Wolf, SF TI Application of ICPMS for the characterization of solutions generated from durability testing of spent nuclear fuel. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Argonne Natl Lab, Div Chem Technol, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 34-NUCL BP U8 EP U8 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300035 ER PT J AU Yang, CH Shahu, M Bouadani, M Pibel, CD Patrick, KH Halpern, JB McIlroy, A Taatjes, CA AF Yang, CH Shahu, M Bouadani, M Pibel, CD Patrick, KH Halpern, JB McIlroy, A Taatjes, CA TI Vinyl radical: Visible spectroscopy and excited state dynamics. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 American Univ, Dept Chem, Washington, DC 20016 USA. American Univ, Dept Phys, Washington, DC 20016 USA. Howard Univ, Dept Chem, Washington, DC 20059 USA. Sandia Natl Labs, Combust Res Facil, Livermore, CA USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 371-PHYS BP U210 EP U210 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091301189 ER PT J AU Yang, JC Sykora, M Wen, XG Meyer, TJ AF Yang, JC Sykora, M Wen, XG Meyer, TJ TI Electropolymerized vinylbipyridine complexes of Ru(II) in SiO2 sol-gel films. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ N Carolina, Dept Chem, Chapel Hill, NC 27599 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 352-INOR BP U505 EP U506 PN 1 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202718 ER PT J AU Yeh, JT Pennline, HW Resnik, KP AF Yeh, JT Pennline, HW Resnik, KP TI Study of CO2 absorption and desorption in a packed column. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE, Pittsburgh, PA 15236 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 42-FUEL BP U391 EP U391 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202073 ER PT J AU Yeung, ES Gao, QF AF Yeung, ES Gao, QF TI High speed high throughput mutation detection based on capillary electrophoresis. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Iowa State Univ Sci & Technol, Ames Lab, US DOE, Ames, IA 50011 USA. Iowa State Univ Sci & Technol, Dept Chem, Ames, IA 50011 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 165-ANYL BP U103 EP U103 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091200492 ER PT J AU Yoo, CS Iota, V Cynn, H AF Yoo, CS Iota, V Cynn, H TI Novel non-molecular phases of carbon dioxide at high pressures and temperatures. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Phys Directorate, H Div, Livermore, CA 94551 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 4-PHYS BP U156 EP U156 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300823 ER PT J AU Yoon, IS Tonkyn, RG Panov, AG Kolwaite, AC Barlow, SE Balmer, ML AF Yoon, IS Tonkyn, RG Panov, AG Kolwaite, AC Barlow, SE Balmer, ML TI Reaction mechanism study of lean NOX reduction using plasma catalysis. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Richland, WA 99353 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 6-CATL BP U388 EP U388 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091302219 ER PT J AU Young, JE Crump, SL AF Young, JE Crump, SL TI Determination of hydrogen isotopic content in aqueous materials containing deuterium oxide by solid phase microextraction. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Westinghouse Savannah River Co, Savannah River Technol Ctr, Aiken, SC 29808 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 38-NUCL BP U8 EP U8 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300039 ER PT J AU Zachara, JM Fredrickson, J Smith, SC Kukkadapu, RK AF Zachara, JM Fredrickson, J Smith, SC Kukkadapu, RK TI Biogeochemical processes controlling trace metal fluxes from Fe(III) oxides during bacterial reduction. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Pacific NW Natl Lab, Richland, WA 99352 USA. Pacific NW Natl Lab, Dept Microbiol, Richland, WA USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 195-ENVR BP U347 EP U347 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201817 ER PT J AU Zaug, JM Fried, LE Hansen, DW AF Zaug, JM Fried, LE Hansen, DW TI Equilibrium properties and structural relaxation in simple fluids at high-pressure and temperature. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RI Fried, Laurence/L-8714-2014 OI Fried, Laurence/0000-0002-9437-7700 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 108-PHYS BP U171 EP U171 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091300926 ER PT J AU Zawodzinski, TA Mann, M Haridoss, P Paddison, S AF Zawodzinski, TA Mann, M Haridoss, P Paddison, S TI Artificial muscle systems for biomedical applications. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RI Paddison, Stephen/B-2935-2014 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 270-PMSE BP U369 EP U369 PN 2 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XV UT WOS:000166091302135 ER PT J AU Zhang, ZT Dai, S Wei, Y Qiu, SL AF Zhang, ZT Dai, S Wei, Y Qiu, SL TI Molecularly imprinted zeolites and molecule sieves. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Oak Ridge Natl Lab, Div Chem Technol, Oak Ridge, TN 37831 USA. Drexel Univ, Philadelphia, PA 19104 USA. Jilin Univ, Changchun, Peoples R China. RI Wei, Yen/H-5329-2012; Dai, Sheng/K-8411-2015 OI Dai, Sheng/0000-0002-8046-3931 NR 0 TC 0 Z9 0 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 347-INOR BP U505 EP U505 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202713 ER PT J AU Zhou, QH Kim, C Deng, BL Thornton, EC AF Zhou, QH Kim, C Deng, BL Thornton, EC TI Effects of mineral surfaces on chromium (VI) reduction by hydrogen sulfide. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 New Mexico Inst Min & Technol, Dept Environm Engn, Socorro, NM 87801 USA. Pacific NW Natl Lab, Field Hydrol & Chem Grp, Richland, WA USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 274-ENVR BP U359 EP U359 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091201896 ER PT J AU Ziegler, T Patchkovskii, S Wolff, SK Khandogin, J Schreckenbach, G Autschbach, J Ruitz-Morales, Y AF Ziegler, T Patchkovskii, S Wolff, SK Khandogin, J Schreckenbach, G Autschbach, J Ruitz-Morales, Y TI GIAO-DFT approach to the calculation of NMR and ESR parameters. SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 Univ Calgary, Calgary, AB T2N 1N4, Canada. Univ Calif Los Alamos Natl Lab, Los Alamos, NM USA. RI Ziegler, Tom/D-7863-2012 NR 0 TC 0 Z9 0 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 2000 VL 220 MA 50-INOR BP U462 EP U462 PN 1 PG 1 WC Chemistry, Multidisciplinary SC Chemistry GA 386XU UT WOS:000166091202416 ER PT J AU Schley, RS Telschow, KL Holland, J AF Schley, RS Telschow, KL Holland, J TI Static and dynamic two-wave mixing in GaAs SO APPLIED OPTICS LA English DT Article ID PHOTOREFRACTIVE CRYSTAL; BI12SIO20 CRYSTALS; OPTICAL-DETECTION; INTERFEROMETRY; AMPLIFICATION; PHASE AB We studied the two-wave mixing anisotropif diffraction process in GaAs for demodulation of static and dynamic phase encoded signals. The static results quantitatively agreed with a previous theoretical model for cubic crystals. This model has been described explicitly for all bean polarizations and crystal rotation angles with respect to the plane of incidence. Dynamic phase modulation, in which the signal beam was phase modulated at frequency f(s) and the reference beam at f(r) = f(s) + Delta f, produced a signal at Delta f that was proportional to the difference between the static beam intensities with and without two-wave mixing under all conditions of polarization and crystal orientation studied. A significant dynamic output signal was produced even when only a shift in polarization but no energy transfer occurred as a result of the anisotropic two-wave mixing process. Therefore not only is the two-wave mixing gain important when the photorefractive effect is used for dynamic phase demodulation, but so are the polarization shifts occurring from the mixing process. (C) 2000 Optical Society of America OCIS codes: 190.7070, 190.5330, 190.0190, 190.4400. C1 Idaho Natl Lab, Idaho Falls, ID 83415 USA. RP Schley, RS (reprint author), Idaho Natl Lab, POB 1625-2209, Idaho Falls, ID 83415 USA. EM rsc@inel.gov RI Schaff, William/B-5839-2009; Schley, Robert/B-9124-2017 OI Schley, Robert/0000-0001-8907-6535 NR 21 TC 2 Z9 2 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 1559-128X EI 2155-3165 J9 APPL OPTICS JI Appl. Optics PD AUG 20 PY 2000 VL 39 IS 24 BP 4348 EP 4354 DI 10.1364/AO.39.004348 PG 7 WC Optics SC Optics GA 345UM UT WOS:000088833600022 PM 18350021 ER PT J AU Ramirez-Ruiz, E Fenimore, EE AF Ramirez-Ruiz, E Fenimore, EE TI Pulse width evolution in gamma-ray bursts: Evidence for internal shocks SO ASTROPHYSICAL JOURNAL LA English DT Article DE gamma rays : bursts; shock waves ID TEMPORAL STRUCTURE; VARIABILITY; MODELS AB Many cosmological models of gamma-ray bursts (GRBs) envision the energy source to be a cataclysmic stellar event leading to a relativistically expanding fireball. Particles are thought to be accelerated at shocks and produce nonthermal radiation. The highly variable temporal structure observed in most GRBs has significantly constrained models. By using different methods of statistical analysis in the time domain, we find that the width of the large-amplitude pulses in GRB time histories remains remarkably constant throughout the classic GRB phase. This is also true for small-amplitude pulses. However, small and large pulses do not have the same pulse width within a single time history. We find a quantitative relationship between pulse amplitude and pulse width: the smaller amplitude peaks tend to be wider, with the pulse width following a power law with an index of about -2.8. Internal shocks simulated by randomly selecting the Lorentz factor and energy per shell are consistent with a power-law relationship. This is strong quantitative evidence that GRBs are indeed caused by internal shocks. The dependency of the width-versus-intensity relationship on the maximum Lorentz factor provides a way to estimate that elusive parameter. Our observed power-law index indicates that Gamma(max) is less than or similar to 10(3). We also interpret the narrowness of the pulse width distribution as indicating that the emission that occurs when one shell overtakes another is produced over a small range of distances from the central site. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England. RP Ramirez-Ruiz, E (reprint author), Los Alamos Natl Lab, MS D436, Los Alamos, NM 87545 USA. NR 16 TC 99 Z9 101 U1 0 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 SOUTH WOODLAWN AVE, CHICAGO, IL 60637-1603 USA SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 20 PY 2000 VL 539 IS 2 BP 712 EP 717 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 353AY UT WOS:000089252600019 ER PT J AU Burrows, A Young, T Pinto, P Eastman, R Thompson, TA AF Burrows, A Young, T Pinto, P Eastman, R Thompson, TA TI A new algorithm for supernova neutrino transport and some applications SO ASTROPHYSICAL JOURNAL LA English DT Article DE elementary particles; methods : numerical; radiative transfer; stars : interiors; stars : neutron; supernovae : general ID PLANE-PARALLEL ATMOSPHERE; RADIATIVE-TRANSFER THEORY; STELLAR CORE COLLAPSE; QUADRATURE PERTURBATIONS; HYDROSTATIC EQUILIBRIUM; INTERACTION RATES; NUCLEAR-MATTER; DENSE; WEAK; BOLTZMANN AB We have developed an implicit, multigroup, time-dependent, spherical neutrino transport code based on the Feautrier variables, the tangent-ray method, and accelerated Lambda iteration. The code achieves high angular resolution, is good to O(nu/c), is equivalent to a Boltzmann solver (without gravitational redshifts), and solves the transport equation at all optical depths with precision. In this paper, we present our formulation of the relevant numerics and microphysics and explore protoneutron star atmospheres for snapshot postbounce models. Our major focus is on spectra, neutrino-matter heating rates, Eddington factors, angular distributions, and phase-space occupancies. In addition, we investigate the influence on neutrino spectra and heating of final-state electron blocking, stimulated absorption, velocity terms in the transport equation, neutrino-nucleon scattering asymmetry, and weak magnetism and recoil effects. Furthermore, we compare the emergent spectra and heating rates obtained using full transport with those obtained using representative flux-limited transport formulations to gauge their accuracy and viability. Finally, we derive useful formulae for the neutrino source strength due to nucleon-nucleon bremsstrahlung and determine bremsstrahlung's influence on the emergent nu(mu) and nu(tau) neutrino spectra. These studies are in preparation for new calculations of spherically symmetric core-collapse supernovae, protoneutron star winds, and neutrino signals. C1 Univ Arizona, Dept Astron, Tucson, AZ 85721 USA. Univ Arizona, Steward Observ, Tucson, AZ 85721 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA. Univ Arizona, Dept Phys, Tucson, AZ 85721 USA. RP Burrows, A (reprint author), Univ Arizona, Dept Astron, Tucson, AZ 85721 USA. NR 66 TC 102 Z9 102 U1 0 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 SOUTH WOODLAWN AVE, CHICAGO, IL 60637-1603 USA SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 20 PY 2000 VL 539 IS 2 BP 865 EP 887 DI 10.1086/309244 PN 1 PG 23 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 353AY UT WOS:000089252600035 ER PT J AU Kitamura, H AF Kitamura, H TI Pycnonuclear reactions in dense matter near solidification SO ASTROPHYSICAL JOURNAL LA English DT Article DE dense matter; nuclear reactions, nucleosynthesis, abundances; planetary systems; stars : interiors; stars : low-mass, brown dwarfs; supernovae : general ID THERMONUCLEAR REACTION-RATES; NUCLEAR-REACTION RATES; RELATIVISTIC DEGENERATE ELECTRONS; BINARY-IONIC MIXTURES; ONE-COMPONENT PLASMA; STELLAR MATTER; THERMODYNAMIC PROPERTIES; METALLIC HYDROGEN; CLASSICAL PLASMAS; GIANT PLANETS AB Rates of nuclear fusion reactions in dense matter and their enhancement due to electron screening and internuclear many-body correlation are calculated by explicitly taking into account dielectric functions of relativistic and nonrelativistic electrons, screening potentials based on the Monte Carlo simulations, and interaction free energies in dense electron-screened binary-ionic-mixture fluids. Pycnonuclear reactions are predicted near fluid-solid transitions at high densities, where the total reaction rates in fluid and solid phases take on comparable values that are virtually independent of the temperature. Analytic expressions for the reaction rates are presented and are applied to dense carbon-oxygen matter in the white dwarf interiors near ignition conditions and to dense proton-deuteron matter in giant planets and brown dwarfs. Possibility of a laboratory detection of pycnonuclear reactions in ultrahigh-pressure metallic hydrogen near solidification is explored. C1 Univ Calif Los Alamos Natl Lab, Div Appl Phys, Los Alamos, NM 87545 USA. RP Kitamura, H (reprint author), Univ Calif Los Alamos Natl Lab, Div Appl Phys, POB 1663, Los Alamos, NM 87545 USA. NR 44 TC 25 Z9 25 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 SOUTH WOODLAWN AVE, CHICAGO, IL 60637-1603 USA SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 20 PY 2000 VL 539 IS 2 BP 888 EP 901 DI 10.1086/309258 PN 1 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 353AY UT WOS:000089252600036 ER PT J AU Givler, RC Saylors, DB AF Givler, RC Saylors, DB TI Efficient runner networks for investment castings SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING LA English DT Article DE combinatorial optimization; investment casting; runner network; shortest paths ID STEINER AB We present a computational method that finds an efficient runner network for an investment casting, once the gate locations have been established. The method seeks to minimize a cost function that is based on total network volume. The runner segments are restricted to lie in the space not occupied by the part itself. The collection of algorithms has been coded in C and runner designs have been computed for several real parts, demonstrating substantial reductions in rigging volume. Copyright (C) 2000 John Wiley & Sons, Ltd. C1 Sandia Natl Labs, Engn Sci Ctr, Albuquerque, NM 87185 USA. Sandia Natl Labs, Intelligent Syst & Robot Ctr, Albuquerque, NM 87185 USA. RP Givler, RC (reprint author), Sandia Natl Labs, Engn Sci Ctr, MS 0826, Albuquerque, NM 87185 USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX PO19 1UD, ENGLAND SN 0029-5981 J9 INT J NUMER METH ENG JI Int. J. Numer. Methods Eng. PD AUG 20 PY 2000 VL 48 IS 11 BP 1601 EP 1614 DI 10.1002/1097-0207(20000820)48:11<1601::AID-NME894>3.0.CO;2-0 PG 18 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA 342ZX UT WOS:000088678200004 ER PT J AU Morariu, B AF Morariu, B TI Quantum algebra of the particle moving on the q-deformed mass-hyperboloid SO INTERNATIONAL JOURNAL OF MODERN PHYSICS A LA English DT Article ID CONFORMAL FIELD-THEORY; MODEL AB I introduce a reality structure on the Heisenberg double of Fun(q)(SL(N, C)) for q phase, which for N = 2 can be interpreted as the quantum phase space of the particle on the q-deformed mass-hyperboloid. This construction is closely related to the q-deformation of the symmetric top. Finally, I conjecture that the above real form describes zero modes of certain noncompact WZNZ-models. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Theoret Phys Grp, Berkeley, CA 94720 USA. RP Morariu, B (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Phys, Berkeley, CA 94720 USA. NR 14 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 912805, SINGAPORE SN 0217-751X J9 INT J MOD PHYS A JI Int. J. Mod. Phys. A PD AUG 20 PY 2000 VL 15 IS 21 BP 3277 EP 3286 PG 10 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 349XH UT WOS:000089070500001 ER PT J AU Pesiri, DR Snow, RC Elliott, N Maggiore, C Dye, RC AF Pesiri, DR Snow, RC Elliott, N Maggiore, C Dye, RC TI The characterization of asymmetric alumina membranes by Rutherford backscattering spectrometry SO JOURNAL OF MEMBRANE SCIENCE LA English DT Article DE Rutherford backscattering spectrometry; characterization; inorganic membranes; microporous and porous membranes; composite membranes ID POROUS SILICON; FILMS; DEPOSITION; INTERFACES; TRANSPORT; GOLD AB Effective membrane structures often rely on the presence of thin discriminating layers that exert selectivity control while maintaining high fluxes. Characterizing these separating layers is often difficult given the scarcity of analytical tools capable of measuring structural detail below sample surfaces. We have shown that Rutherford backscattering spectrometry (RBS) is an effective tool for characterizing asymmetric inorganic membranes. The ability to accurately measure the thickness and composition of thin metal layers using RES offered a means of analyzing composite structures in which metals are deposited to influence separation or provide strength to the membrane. This analysis of commercially available alumina membranes by RES quantified the interpenetration depth of deposited gold layers. RES has also been applied to the measurement of sample porosity in Al2O3 membranes using specialized O-16 resonance experiments. The measured porosity of these asymmetric membranes resulting from the resonance measurements was compared to a graphical analysis of scanning electron microscopy images. The results of this study suggest that RES may offer advantages in a wide range of membrane materials analysis applications. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Ctr Mat Sci, Los Alamos, NM 87545 USA. RP Dye, RC (reprint author), Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. NR 30 TC 8 Z9 8 U1 1 U2 2 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 AUG 20 PY 2000 VL 176 IS 2 BP 209 EP 221 DI 10.1016/S0376-7388(00)00447-6 PG 13 WC Engineering, Chemical; Polymer Science SC Engineering; Polymer Science GA 345MU UT WOS:000088820400006 ER PT J AU Liu, Z Chen, Y Mo, R Hui, CC Cheng, JF Mohandas, N Huang, CH AF Liu, Z Chen, Y Mo, R Hui, CC Cheng, JF Mohandas, N Huang, CH TI Characterization of human RhCG and mouse Rhcg as novel nonerythroid Rh glycoprotein homologues predominantly expressed in kidney and testis SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID HUMAN ERYTHROCYTE-MEMBRANE; BLOOD-GROUP POLYPEPTIDES; GROUP ANTIGEN EXPRESSION; INSITU HYBRIDIZATION; GENE STRUCTURE; NULL DISEASE; PROTEIN; SEQUENCE; ORGANIZATION; TRANSPORT AB In mammals, the Rh family includes the variable Rh polypeptides and invariant RhAG glycoprotein. These polytopic proteins are confined to the erythroid lineage and are assembled into a multisubunit complex essential for Rfi antigen expression and plasma membrane integrity. Here, we report the characterization of RhCG and Rhcg, a pair of novel Rh homologues present in human and mouse nonerythroid tissues. Despite sharing a notable similarity to the erythroid forms, including the 12-transmembrane topological fold, the RHCG/Rhcg pair is distinct in chromosome location, genomic organization, promoter structure, and tissue-specific expression. RHCG and Rhcg map at 15q25 of human chromosome 15 and the long arm of mouse chromosome 7, respectively, each having 11 exons and a CpG-rich promoter. Northern blots detected kidney and testis as the major organs of RHCG or Rhcg expression. In situ hybridization revealed strong expression of Rhcg in the kidney collecting tubules and testis seminiferous tubules. Confocal imaging of transiently expressed green fluorescence protein fusion proteins localized RhCG exclusively to the plasma membrane, a distribution confirmed by cellular fractionation and Western blot analysis. In vitro translation and ex vivo expression showed that RhCG carries a complex N-glycan, probably at the (NLS50)-N-48 sequon of exoloop 1. These results pinpoint RhCG and Rhcg as novel polytopic membrane glycoproteins that may function as epithelial transporters maintaining normal homeostatic conditions in kidney and testis. C1 New York Blood Ctr, Lindsley F Kimball Res Inst, Lab Biochem & Mol Genet, New York, NY 10021 USA. Hosp Sick Children, Program Dev Biol, Toronto, ON M5G 1X8, Canada. Univ Toronto, Dept Mol & Med Genet, Toronto, ON M5G 1X8, Canada. Lawrence Berkeley Lab, Div Life Sci, Berkeley, CA 94720 USA. RP Huang, CH (reprint author), New York Blood Ctr, Lindsley F Kimball Res Inst, Lab Biochem & Mol Genet, 310 E 67th St, New York, NY 10021 USA. FU NHLBI NIH HHS [HL54459] NR 47 TC 108 Z9 113 U1 0 U2 1 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 USA SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD AUG 18 PY 2000 VL 275 IS 33 BP 25641 EP 25651 DI 10.1074/jbc.M003353200 PG 11 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 346BB UT WOS:000088849400079 PM 10852913 ER PT J AU Goheen, SC Gibbins, BM AF Goheen, SC Gibbins, BM TI Protein losses in ion-exchange and hydrophobic interaction high-performance liquid chromatography SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article; Proceedings Paper CT 19th International Symposium on the Separation and Analysis of Proteins, Peptides, and Polynucleotides (ISPPP 99) CY OCT 31-NOV 03, 1999 CL DELRAY BEACH, FLORIDA SP Waters Corp, Agilent Technol, Octapharma Pharmazeut, BIA Separat DE hydrophobic interaction chromatography; proteins ID POLYSTYRENE SURFACES; CIRCULAR-DICHROISM; RIBONUCLEASE-A; CYTOCHROME-C; ADSORPTION; PHASE; ADHESION; BEHAVIOR; IGG; SPECTROSCOPY AB Protein losses in ion-exchange and hydrophobic interaction HPLC were examined. The supports were all non-porous, packed in columns of identical dimensions. Two ion-exchange chromatography (IEC), anion and cation, as well as a hydrophobic interaction chromatography (HIC) columns were tested. Proteins included cytochrome c, bovine serum albumin (BSA), immunoglobulin G and fibrinogen. Temperature effects on HIC supports were studied for cytochrome c and BSA. Both retention times and recoveries of the proteins were measured. The influence of column residence time on the recovery of proteins was also investigated. We found a linear relationship between the amount of protein recovered and the log of the molecular mass. Retention times also generally increased with temperature for both HIC and IEC. Other trends in retention behavior and recoveries are discussed. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RP Goheen, SC (reprint author), Pacific NW Natl Lab, POB 999,MS P8-08, Richland, WA 99352 USA. NR 31 TC 36 Z9 37 U1 6 U2 14 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD AUG 18 PY 2000 VL 890 IS 1 BP 73 EP 80 DI 10.1016/S0021-9673(00)00572-0 PG 8 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA 344BC UT WOS:000088736900009 PM 10976796 ER PT J AU Korber, B Bhattacharya, T Theiler, J Gupta, R Lapedes, A Hahn, B Gao, F Muldoon, M Wolinsky, S AF Korber, B Bhattacharya, T Theiler, J Gupta, R Lapedes, A Hahn, B Gao, F Muldoon, M Wolinsky, S TI Search for the origin of HIV and AIDS - Response SO SCIENCE LA English DT Letter ID IMMUNODEFICIENCY-VIRUS; INFECTION; RECOMBINATION; MONKEYS C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. Santa Fe Inst, Santa Fe, NM 87501 USA. Univ Alabama, Dept Med, Birmingham, AL 35294 USA. Univ Alabama, Dept Microbiol, Birmingham, AL 35294 USA. Univ Manchester, Inst Technol, Manchester, Lancs, England. Northwestern Univ, Chicago, IL 60611 USA. RP Korber, B (reprint author), Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RI Muldoon, Mark/C-7505-2009; Wolinsky, Steven/B-2893-2012; Bhattacharya, Tanmoy/J-8956-2013; OI Bhattacharya, Tanmoy/0000-0002-1060-652X; Korber, Bette/0000-0002-2026-5757 NR 15 TC 5 Z9 5 U1 0 U2 1 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD AUG 18 PY 2000 VL 289 IS 5482 BP 1140 EP 1141 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 346JE UT WOS:000088866600015 ER PT J AU De La Rocha, CL DePaolo, DJ AF De La Rocha, CL DePaolo, DJ TI Isotopic evidence for variations in the marine calcium cycle over the cenozoic SO SCIENCE LA English DT Article ID ATMOSPHERIC CARBON-DIOXIDE; CHEMICAL-COMPOSITION; MIOCENE; OCEAN; SEAWATER; FRACTIONATION; CONSTRAINTS; CALIFORNIA; WATERS; RECORD AB Significant variations in the isotopic composition of marine calcium have occurred over the Last 80 million years. These variations reflect deviations in the balance between inputs of calcium to the ocean from weathering and outputs due to carbonate sedimentation, processes that are important in controlling the concentration of carbon dioxide in the atmosphere and, hence, global climate. The calcium isotopic ratio of paleo-seawater is an indicator of past changes in atmospheric carbon dioxide when coupled with determinations of paleo-pH. C1 Univ Calif Berkeley, Dept Geol & Geophys, Berkeley Ctr Isotope Geochem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. RP De La Rocha, CL (reprint author), Univ Cambridge, Dept Earth Sci, Downing St, Cambridge CB2 3EQ, England. NR 39 TC 145 Z9 147 U1 7 U2 49 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD AUG 18 PY 2000 VL 289 IS 5482 BP 1176 EP 1178 DI 10.1126/science.289.5482.1176 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 346JE UT WOS:000088866600037 PM 10947981 ER PT J AU Miller, JA Klippenstein, SJ Robertson, SH AF Miller, JA Klippenstein, SJ Robertson, SH TI A theoretical analysis of the reaction between vinyl and acetylene: Quantum chemistry and solution of the master equation SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID UNIMOLECULAR REACTIONS; GAUSSIAN-2 THEORY; ENERGY-TRANSFER; MULTIPLE-WELL; DECOMPOSITION; ISOMERIZATION AB We have studied the reaction between vinyl and acetylene theoretically using electronic structure theory (DFT-B3LYP and a G2-like method) to calculate properties of stationary points on the potential, RRKM theory to compute microcanonical rate coefficients, and solutions to the time-dependent, multiple-well master equation to extract information about the thermal rate coefficient and product distribution as a function of temperature and pressure. For the temperature range, 300 K less than or equal to T less than or equal to 700 K, both the total rate coefficient k(1)(T,p) and the products are functions of pressure. For 700 K less than or equal to T less than or equal to 900 K, k(1)(T,p) is not always well defined in that the reactants can exhibit nonexponential decays in time. At sufficiently high pressure, the dominant product of the reaction changes from n-C4H5 to c-C4H5 (a four-numbered ring) to C4H4 + H, where C4H4 is vinyl acetylene, as the temperature is increased from 600 K to 900 K. For T > 900 K, the reaction can be written as an elementary step, C2H3 + C2H2 --> C4H4 + H (R1), With a rate coefficient, k(1) = 2.19 x 10(-12)T(0.163) exp(-8312/RT) cm(3)/(molecule.s), independent of pressure, even though the intermediate collision complex may suffer numerous collisions. We interpret our results in terms of the eigenvalues and eigenvectors of the G matrix, i.e., the relaxation/reaction matrix of the master equation. For T > 900 K, k(1)(T,p) always corresponds to the largest eigenvalue of G, which in turn corresponds to the zero-pressure-limit rate coefficient k(0)(T). The situation is more complicated at lower temperatures. Our predictions are in good agreement with the limited amount of experimental information available on the reaction. The quantum chemistry calculations indicate that both c-C4H5 and i-C4H5 are more stable than n-C4H5. The G2-like method gives results for the Delta H-f((0))(0 K) of c-C4H5 and i-C4H5 that are lower that that of n-C4H5 by 9.5 and 11.2 kcal/mol, respectively. The DFT-B3LYP results show similar differences of 6.0 and 13.7 kcal/mol, respectively. C1 Sandia Natl Labs, Combust Res Facil, Livermore, CA 94551 USA. Case Western Reserve Univ, Dept Chem, Cleveland, OH 44106 USA. Mol Simulat Inc, Cambridge CB5 8RE, England. RP Miller, JA (reprint author), Sandia Natl Labs, Combust Res Facil, Livermore, CA 94551 USA. OI Klippenstein, Stephen/0000-0001-6297-9187 NR 32 TC 65 Z9 65 U1 1 U2 26 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD AUG 17 PY 2000 VL 104 IS 32 BP 7525 EP 7536 DI 10.1021/jp000687+ PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 345RK UT WOS:000088828800014 ER PT J AU Zhan, CG Landry, DW Ornstein, RL AF Zhan, CG Landry, DW Ornstein, RL TI Energy barriers for alkaline hydrolysis of carboxylic acid esters in aqueous solution by reaction field calculations SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID PHENOLATE ION NUCLEOPHILES; TRANSITION-STATE STRUCTURE; ACETYL GROUP TRANSFER; GAS-PHASE; CONCERTED MECHANISM; METHYL FORMATE; HYDROXIDE ION; MODEL; SIMULATION; FORMAMIDE AB The hydrolysis of six representative alkyl esters in aqueous solution were evaluated by performing ab initio molecular orbital calculations using five different self-consistent reaction field (SCRF) procedures. Energy barriers were obtained for hydrolysis by bimolecular base-catalyzed acyl-oxygen cleavage (B(AC)2) and bimolecular base-catalyzed alkyl-oxygen cleavage (B(AL)2) Despite strong solute-solvent hydrogen bonding, the calculated solvent shifts of the energy barriers are dominated by electrostatic interactions between solute and solvent, and nonelectrostatic interactions largely cancel out. SCRF calculations that ignore volume polarization or use a charge renormalization scheme usually overestimate the solvent shifts of the energy barriers. A recently developed surface and volume polarization for electrostatic interaction (SVPE) procedure yields results comparable to experimental data when the solute cavity surface is defined as the 0.002 au electron charge isodensity contour. The differences between values from the SVPE calculations with this contour and the corresponding average experimental values for the examined esters are smaller than the range of experimental values reported by different laboratories. The SVPE calculations for the B(AC)2 hydrolysis predicted the lowest energy barrier for methyl formate and the highest for tert-butyl acetate, and the remaining four esters grouped closely. These results are consistent with the substituent shifts of the experimental activation energies. The energy barriers predicted for B(AL)2 hydrolysis are always considerably higher than these predicted for the B(AC)2, consistent with the observation that in aqueous solution B(AL)2 hydrolysis is negligible compared to B(AC)2 for alkyl esters. C1 Pacific NW Natl Lab, Environm Technol Div, Richland, WA 99352 USA. Columbia Univ Coll Phys & Surg, Dept Med, New York, NY 10032 USA. RP Zhan, CG (reprint author), Pacific NW Natl Lab, Environm Technol Div, Mailstop K2-21, Richland, WA 99352 USA. EM Chang-Guo.Zhan@pnl.gov NR 62 TC 65 Z9 68 U1 1 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD AUG 17 PY 2000 VL 104 IS 32 BP 7672 EP 7678 DI 10.1021/jp001459i PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 345RK UT WOS:000088828800034 ER PT J AU Yoo, YK Duewer, F Yang, HT Yi, D Li, JW Xiang, XD AF Yoo, YK Duewer, F Yang, HT Yi, D Li, JW Xiang, XD TI Room-temperature electronic phase transitions in the continuous phase diagrams of perovskite manganites SO NATURE LA English DT Article ID CHARGE-ORDERED STRIPES; MANGANESE OXIDES; SPIN FLUCTUATIONS; SUPERCONDUCTORS; MAGNETORESISTANCE; INSULATOR; LA1-XCAXMNO3; SEPARATION; STATE AB Highly correlated electronic systems-such as transition-metal oxides that are doped Mott insulators-are complex systems which exhibit puzzling phenomena, including high-temperature superconductivity and colossal magnetoresistivity. Recent studies(1-3) suggest that in such systems collective electronic phenomena are important, arising from long-range Coulomb interactions and magnetic effects. The qualitative behaviour of these systems is strongly dependent on charge filling (the level of doping) and the lattice constant. Here we report a time-efficient and systematic experimental approach for studying the phase diagrams of condensed-matter systems. It involves the continuous mapping of the physical properties of epitaxial thin films of perovskite manganites (a class of doped Mott insulator) as their composition is varied. We discover evidence that suggests the presence of phase boundaries of electronic origin at room temperature. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. RP Xiang, XD (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA. RI Xiang, Xiaodong/A-9445-2012; Xiang, Xiaodong/A-5936-2017 NR 30 TC 56 Z9 60 U1 3 U2 22 PU MACMILLAN PUBLISHERS LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 J9 NATURE JI Nature PD AUG 17 PY 2000 VL 406 IS 6797 BP 704 EP 708 DI 10.1038/35021018 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 344PH UT WOS:000088767700037 ER PT J AU Abbott, B Abolins, M Abramov, V Acharya, BS Adams, DL Adams, M Akimov, V Alves, GA Amos, N Anderson, EW Baarmand, MM Babintsev, VV Babukhadia, L Baden, A Baldin, B Banerjee, S Bantly, J Barberis, E Baringer, P Bartlett, JF Bassler, U Bean, A Belyaev, A Beri, SB Bernardi, G Bertram, I Bezzubov, VA Bhat, PC Bhatnagar, V Bhattacharjee, M Blazey, G Blessing, S Boehnlein, A Bojko, NI Borcherding, F Brandt, A Breedon, R Briskin, G Brock, R Brooijmans, G Bross, A Buchholz, D Buehler, M Buescher, V Burtovoi, VS Butler, JM Canelli, F Carvalho, W Casey, D Casilum, Z Castilla-Valdez, H Chakraborty, D Chan, KM Chekulaev, SV Cho, DK Choi, S Chopra, S Choudhary, BC Christenson, JH Chung, M Claes, D Clark, AR Cochran, J Coney, L Connolly, B Cooper, WE Coppage, D Cullen-Vidal, D Cummings, MAC Cutts, D Dahl, OI Davis, K De, K Del Signore, K Demarteau, M Denisov, D Denisov, SP Diehl, HT Diesburg, M Di Loreto, G Doulas, S Draper, P Ducros, Y Dudko, LV Dugad, SR Dyshkant, A Edmunds, D Ellison, J Elvira, VD Engelmann, R Eno, S Eppley, G Ermolov, P Eroshin, OV Estrada, J Evans, H Evdokimov, VN Fahland, T Feher, S Fein, D Ferbel, T Fisk, HE Fisyak, Y Flattum, E Fleuret, F Fortner, M Frame, KC Fuess, S Gallas, E Galyaev, AN Gartung, P Gavrilov, V Genik, RJ Genser, K Gerber, CE Gershtein, Y Gibbard, B Gilmartin, R Ginther, G Gomez, B Gomez, G Goncharov, PI Solis, JLG Gordon, H Goss, LT Gounder, K Goussiou, A Graf, N Grannis, PD Green, JA Greenlee, H Grinstein, S Grudberg, P Grunendahl, S Guglielmo, G Gupta, A Gurzhiev, SN Gutierrez, G Gutierrez, P Hadley, NJ Haggerty, H Hagopian, S Hagopian, V Hahn, KS Hall, RE Hanlet, P Hansen, S Hauptman, JM Hays, C Hebert, C Hedin, D Heinson, AP Heintz, U Heuring, T Hirosky, R Hobbs, JD Hoeneisen, B Hoftun, JS Ito, AS Jerger, SA Jesik, R Joffe-Minor, T Johns, K Johnson, M Jonckheere, A Jones, M Jostlein, H Juste, A Kahn, S Kajfasz, E Karmanov, D Karmgard, D Kehoe, R Kim, SK Klima, B Klopfenstein, C Knuteson, B Ko, W Kohli, JM Kostritskiy, AV Kotcher, J Kotwal, AV Kozelov, AV Kozlovsky, EA Krane, J Krishnaswamy, MR Krzywdzinski, S Kubantsev, M Kuleshov, S Kulik, Y Kunori, S Landsberg, G Leflat, A Lehner, F Li, J Li, QZ Lima, JGR Lincoln, D Linn, SL Linnemann, J Lipton, R Lu, JG Lucotte, A Lueking, L Lundstedt, C Maciel, AKA Madaras, RJ Manankov, V Mani, S Mao, HS Marshall, T Martin, MI Martin, RD Mauritz, KM May, B Mayorov, AA McCarthy, R McDonald, J McMahon, T Melanson, HL Meng, XC Merkin, M Merritt, KW Miao, C Miettinen, H Mihalcea, D Mincer, A Mishra, CS Mokhov, N Mondal, NK Montgomery, HE Mostafa, M da Motta, H Nagy, E Nang, F Narain, M Narasimham, VS Neal, HA Negret, JP Negroni, S Norman, D Oesch, L Oguri, V Olivier, B Oshima, N Padley, P Pan, LJ Para, A Parashar, N Partridge, R Parua, N Paterno, M Patwa, A Pawlik, B Perkins, J Peters, M Piegaia, R Piekarz, H Pope, BG Popkov, E Prosper, HB Protopopescu, S Qian, J Quintas, PZ Raja, R Rajagopalan, S Reay, NW Reucroft, S Rijssenbeek, M Rockwell, T Roco, M Rubinov, P Ruchti, R Rutherfoord, J Santoro, A Sawyer, L Schamberger, RD Schellman, H Schwartzman, A Sculli, J Sen, N Shabalina, E Shankar, HC Shivpuri, RK Shpakov, D Shupe, M Sidwell, RA Simak, V Singh, H Singh, JB Sirotenko, V Slattery, P Smith, E Smith, RP Snihur, R Snow, GR Snow, J Snyder, S Solomon, J Song, XF Sorin, V Sosebee, M Sotnikova, N Soustruznik, K Souza, M Stanton, NR Steinbruck, G Stephens, RW Stevenson, ML Stichelbaut, F Stoker, D Stolin, V Stoyanova, DA Strauss, M Streets, K Strovink, M Stutte, L Sznajder, A Taylor, W Tentindo-Repond, S Thomas, TLT Thompson, J Toback, D Trippe, TG Turcot, AS Tuts, PM van Gemmeren, P Vaniev, V Van Kooten, R Varelas, N Volkov, AA Vorobiev, AP Wahl, HD Wang, H Warchol, J Watts, G Wayne, M Weerts, H White, A White, JT Whiteson, D Wightman, JA Willis, S Wimpenny, SJ Wirjawan, JVD Womersley, J Wood, DR Yamada, R Yamin, P Yasuda, T Yip, K Youssef, S Yu, J Yu, Z Zanabria, M Zheng, H Zhou, Z Zhu, ZH Zielinski, M Zieminska, D Zieminski, A Zutshi, V Zverev, EG Zylberstejn, A AF Abbott, B Abolins, M Abramov, V Acharya, BS Adams, DL Adams, M Akimov, V Alves, GA Amos, N Anderson, EW Baarmand, MM Babintsev, VV Babukhadia, L Baden, A Baldin, B Banerjee, S Bantly, J Barberis, E Baringer, P Bartlett, JF Bassler, U Bean, A Belyaev, A Beri, SB Bernardi, G Bertram, I Bezzubov, VA Bhat, PC Bhatnagar, V Bhattacharjee, M Blazey, G Blessing, S Boehnlein, A Bojko, NI Borcherding, F Brandt, A Breedon, R Briskin, G Brock, R Brooijmans, G Bross, A Buchholz, D Buehler, M Buescher, V Burtovoi, VS Butler, JM Canelli, F Carvalho, W Casey, D Casilum, Z Castilla-Valdez, H Chakraborty, D Chan, KM Chekulaev, SV Cho, DK Choi, S Chopra, S Choudhary, BC Christenson, JH Chung, M Claes, D Clark, AR Cochran, J Coney, L Connolly, B Cooper, WE Coppage, D Cullen-Vidal, D Cummings, MAC Cutts, D Dahl, OI Davis, K De, K Del Signore, K Demarteau, M Denisov, D Denisov, SP Diehl, HT Diesburg, M Di Loreto, G Doulas, S Draper, P Ducros, Y Dudko, LV Dugad, SR Dyshkant, A Edmunds, D Ellison, J Elvira, VD Engelmann, R Eno, S Eppley, G Ermolov, P Eroshin, OV Estrada, J Evans, H Evdokimov, VN Fahland, T Feher, S Fein, D Ferbel, T Fisk, HE Fisyak, Y Flattum, E Fleuret, F Fortner, M Frame, KC Fuess, S Gallas, E Galyaev, AN Gartung, P Gavrilov, V Genik, RJ Genser, K Gerber, CE Gershtein, Y Gibbard, B Gilmartin, R Ginther, G Gomez, B Gomez, G Goncharov, PI Solis, JLG Gordon, H Goss, LT Gounder, K Goussiou, A Graf, N Grannis, PD Green, JA Greenlee, H Grinstein, S Grudberg, P Grunendahl, S Guglielmo, G Gupta, A Gurzhiev, SN Gutierrez, G Gutierrez, P Hadley, NJ Haggerty, H Hagopian, S Hagopian, V Hahn, KS Hall, RE Hanlet, P Hansen, S Hauptman, JM Hays, C Hebert, C Hedin, D Heinson, AP Heintz, U Heuring, T Hirosky, R Hobbs, JD Hoeneisen, B Hoftun, JS Ito, AS Jerger, SA Jesik, R Joffe-Minor, T Johns, K Johnson, M Jonckheere, A Jones, M Jostlein, H Juste, A Kahn, S Kajfasz, E Karmanov, D Karmgard, D Kehoe, R Kim, SK Klima, B Klopfenstein, C Knuteson, B Ko, W Kohli, JM Kostritskiy, AV Kotcher, J Kotwal, AV Kozelov, AV Kozlovsky, EA Krane, J Krishnaswamy, MR Krzywdzinski, S Kubantsev, M Kuleshov, S Kulik, Y Kunori, S Landsberg, G Leflat, A Lehner, F Li, J Li, QZ Lima, JGR Lincoln, D Linn, SL Linnemann, J Lipton, R Lu, JG Lucotte, A Lueking, L Lundstedt, C Maciel, AKA Madaras, RJ Manankov, V Mani, S Mao, HS Marshall, T Martin, MI Martin, RD Mauritz, KM May, B Mayorov, AA McCarthy, R McDonald, J McMahon, T Melanson, HL Meng, XC Merkin, M Merritt, KW Miao, C Miettinen, H Mihalcea, D Mincer, A Mishra, CS Mokhov, N Mondal, NK Montgomery, HE Mostafa, M da Motta, H Nagy, E Nang, F Narain, M Narasimham, VS Neal, HA Negret, JP Negroni, S Norman, D Oesch, L Oguri, V Olivier, B Oshima, N Padley, P Pan, LJ Para, A Parashar, N Partridge, R Parua, N Paterno, M Patwa, A Pawlik, B Perkins, J Peters, M Piegaia, R Piekarz, H Pope, BG Popkov, E Prosper, HB Protopopescu, S Qian, J Quintas, PZ Raja, R Rajagopalan, S Reay, NW Reucroft, S Rijssenbeek, M Rockwell, T Roco, M Rubinov, P Ruchti, R Rutherfoord, J Santoro, A Sawyer, L Schamberger, RD Schellman, H Schwartzman, A Sculli, J Sen, N Shabalina, E Shankar, HC Shivpuri, RK Shpakov, D Shupe, M Sidwell, RA Simak, V Singh, H Singh, JB Sirotenko, V Slattery, P Smith, E Smith, RP Snihur, R Snow, GR Snow, J Snyder, S Solomon, J Song, XF Sorin, V Sosebee, M Sotnikova, N Soustruznik, K Souza, M Stanton, NR Steinbruck, G Stephens, RW Stevenson, ML Stichelbaut, F Stoker, D Stolin, V Stoyanova, DA Strauss, M Streets, K Strovink, M Stutte, L Sznajder, A Taylor, W Tentindo-Repond, S Thomas, TLT Thompson, J Toback, D Trippe, TG Turcot, AS Tuts, PM van Gemmeren, P Vaniev, V Van Kooten, R Varelas, N Volkov, AA Vorobiev, AP Wahl, HD Wang, H Warchol, J Watts, G Wayne, M Weerts, H White, A White, JT Whiteson, D Wightman, JA Willis, S Wimpenny, SJ Wirjawan, JVD Womersley, J Wood, DR Yamada, R Yamin, P Yasuda, T Yip, K Youssef, S Yu, J Yu, Z Zanabria, M Zheng, H Zhou, Z Zhu, ZH Zielinski, M Zieminska, D Zieminski, A Zutshi, V Zverev, EG Zylberstejn, A CA DO Collaboration TI The b(b)over-bar production cross section and angular correlations in p(p)over-bar collisions at root s = 1.8 TeV SO PHYSICS LETTERS B LA English DT Article ID ROOT-S=1.8 TEV; QUARK PRODUCTION; COLLIDER AB We present measurements of the b (b) over bar production cross section and angular correlations using the D phi detector at the Fermilab Tevatron p (p) over bar Collider operating at root s = 1.8 TeV. The b quark production cross section for /y(b)/ < 1.0 and P-T(b) > 6 GeV/c is extracted from the single muon and dimuon data samples. The results agree in shape with me next-to-leading order QCD calculation of heavy flavor production but are greater than the central values of these predictions. The angular correlations between b and (b) over bar quarks, measured from the azimuthal opening angle between their decay muons, also agree in shape with the next-to-leading order QCD prediction. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Buenos Aires, Buenos Aires, DF, Argentina. Ctr Brasileiro Pesquisas Fis, LAFEX, Rio De Janeiro, Brazil. Univ Estado Rio De Janeiro, Rio De Janeiro, Brazil. Inst High Energy Phys, Beijing 100039, Peoples R China. Univ Los Andes, Bogota, Colombia. Charles Univ, Prague, Czech Republic. Acad Sci Czech Republ, Inst Phys, Prague, Czech Republic. Univ San Francisco, Quito, Ecuador. Univ Grenoble 1, CNRS, IN2P3, Inst Nucl Sci, Grenoble, France. Univ Mediterranee, CNRS, IN2P3, CPPM, Marseille, France. Univ Paris 06, CNRS, IN2P3, LPNHE, Paris, France. Univ Paris 07, CNRS, IN2P3, LPNHE, Paris, France. CEA Saclay, Serv Phys Particules, DAPNIA, F-91190 Gif Sur Yvette, France. Panjab Univ, Chandigarh 160014, India. Univ Delhi, Delhi 110007, India. Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India. Seoul Natl Univ, Seoul, South Korea. CINVESTAV, Mexico City 14000, DF, Mexico. Inst Nucl Phys, Krakow, Poland. Inst Theoret & Expt Phys, Moscow 117259, Russia. Moscow State Univ, Moscow, Russia. Inst High Energy Phys, Protvino, Russia. Univ Lancaster, Lancaster, England. Univ Arizona, Tucson, AZ 85721 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Calif Davis, Davis, CA 95616 USA. Calif State Univ Fresno, Fresno, CA 93740 USA. Univ Calif Irvine, Irvine, CA 92697 USA. Univ Calif Riverside, Riverside, CA 92521 USA. Florida State Univ, Tallahassee, FL 32306 USA. Univ Hawaii, Honolulu, HI 96822 USA. Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Illinois, Chicago, IL 60607 USA. No Illinois Univ, De Kalb, IL 60115 USA. Northwestern Univ, Evanston, IL 60208 USA. Indiana Univ, Bloomington, IN 47405 USA. Univ Notre Dame, Notre Dame, IN 46556 USA. Iowa State Univ, Ames, IA 50011 USA. Univ Kansas, Lawrence, KS 66045 USA. Kansas State Univ, Manhattan, KS 66506 USA. Louisiana Tech Univ, Ruston, LA 71272 USA. Univ Maryland, College Pk, MD 20742 USA. Boston Univ, Boston, MA 02215 USA. Northeastern Univ, Boston, MA 02115 USA. Univ Michigan, Ann Arbor, MI 48109 USA. Michigan State Univ, E Lansing, MI 48824 USA. Univ Nebraska, Lincoln, NE 68588 USA. Columbia Univ, New York, NY 10027 USA. NYU, New York, NY 10003 USA. Univ Rochester, Rochester, NY 14627 USA. SUNY Stony Brook, Stony Brook, NY 11794 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Langston Univ, Langston, OK 73050 USA. Univ Oklahoma, Norman, OK 73019 USA. Brown Univ, Providence, RI 02912 USA. Univ Texas, Arlington, TX 76019 USA. Texas A&M Univ, College Stn, TX 77843 USA. Rice Univ, Houston, TX 77005 USA. Univ Washington, Seattle, WA 98195 USA. RP Abbott, B (reprint author), Univ Buenos Aires, Buenos Aires, DF, Argentina. RI Kim, Sun Kee/G-2042-2015; Shivpuri, R K/A-5848-2010; Gutierrez, Phillip/C-1161-2011; Dudko, Lev/D-7127-2012; Leflat, Alexander/D-7284-2012; Merkin, Mikhail/D-6809-2012; Yip, Kin/D-6860-2013; Kuleshov, Sergey/D-9940-2013; De, Kaushik/N-1953-2013; Oguri, Vitor/B-5403-2013; Alves, Gilvan/C-4007-2013; Belyaev, Alexander/F-6637-2015; Chekulaev, Sergey/O-1145-2015; Sznajder, Andre/L-1621-2016; Canelli, Florencia/O-9693-2016 OI Kim, Sun Kee/0000-0002-0013-0775; Dudko, Lev/0000-0002-4462-3192; Yip, Kin/0000-0002-8576-4311; Kuleshov, Sergey/0000-0002-3065-326X; De, Kaushik/0000-0002-5647-4489; Belyaev, Alexander/0000-0002-1733-4408; Sznajder, Andre/0000-0001-6998-1108; Canelli, Florencia/0000-0001-6361-2117 NR 21 TC 110 Z9 110 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 AUG 17 PY 2000 VL 487 IS 3-4 BP 264 EP 272 DI 10.1016/S0370-2693(00)00844-3 PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 349LM UT WOS:000089046600007 ER PT J AU Breitweg, J Chekanov, S Derrick, M Krakauer, D Magill, S Musgrave, B Pellegrino, A Repond, J Stanek, R Yoshida, R Mattingly, MCK Abbiendi, G Anselmo, F Antonioli, P Bari, G Basile, M Bellagamba, L Boscherini, D Bruni, A Bruni, G Romeo, GC Castellini, G Cifarelli, L Cindolo, F Contin, A Coppola, N Corradi, M De Pasquale, S Giusti, P Iacobucci, G Laurenti, G Levi, G Margotti, A Massam, T Nania, R Palmonari, F Pesci, A Polini, A Sartorelli, G Garcia, YZ Zichichi, A Amelung, C Bornheim, A Brock, I Coboken, K Crittenden, J Deffner, R Hartmann, H Heinloth, K Hilger, E Irrgang, P Jakob, HP Kappes, A Katz, UF Kerger, R Paul, E Rautenberg, J Schnurbusch, H Stifutkin, A Tandler, J Voss, KC Weber, A Wieber, H Bailey, DS Barret, O Brook, NH Foster, B Heath, GP Heath, HF McFall, JD Rodrigues, E Scott, J Tapper, RJ Capua, M Mastroberardino, A Schioppa, M Susinno, G Jeoung, HY Kim, JY Lee, JH Lim, IT Ma, KJ Pac, MY Caldwell, A Liu, W Liu, X Mellado, B Paganis, S Sampson, S Schmidke, WB Sciulli, F Chwastowski, J Eskreys, A Figiel, J Klimek, K Olkiewicz, K Piotrzkowski, K Przybycien, MB Stopa, P Zawiejski, L Bednarek, B Jelen, K Kisielewska, D Kowal, AM Kowalski, T Przybycien, M Rulikowska-Zarebska, E Suszycki, L Szuba, D Kotanski, A Bauerdick, LAT Behrens, U Bienlein, JK Borras, K Dannheim, D Desler, K Drews, G Fox-Murphy, A Fricke, U Goebel, F Goers, S Gottlicher, P Graciani, R Haas, T Hain, W Hartner, GF Hasell, D Hebbel, K Kasemann, M Koch, W Kotz, U Kowalski, H Lindemann, L Lohr, B Mankel, R Martinez, M Milite, M Moritz, M Notz, D Pelucchi, F Petrucci, MC Rohde, M Savin, AA Schneekloth, U Selonke, F Sievers, M Stonjek, S Wolf, G Wollmer, U Youngman, C Zeuner, W Coldewey, C Viani, ALD Meyer, A Schlenstedt, S Straub, PB Barbagli, G Gallo, E Pelfer, P Maccarrone, G Votano, L Bamberger, A Benen, A Eisenhardt, S Markun, P Raach, H Wolfle, S Bussey, PJ Bell, M Doyle, AT Lee, SW Lupi, A Macdonald, N McCance, GJ Saxon, DH Sinclair, LE Skillicorn, IO Waugh, R Bohnet, I Gendner, N Holm, U Meyer-Larsen, A Salehi, H Wick, K Garfagnini, A Gialas, I Gladilin, LK Kcira, D Klanner, R Lohrmann, E Poelz, G Zetsche, F Goncalo, R Long, KR Miller, DB Tapper, AD Walker, R Mallik, U Cloth, P Filges, D Ishii, T Kuze, M Nagano, K Tokushuku, K Yamada, S Yamazaki, Y Ahn, SH Lee, SB Park, SK Lim, H Park, IH Son, D Barreiro, F Garcia, G Glasman, C Gonzalez, O Labarga, L del Peso, J Redondo, I Terron, J Barbi, M Corriveau, F Hanna, DS Ochs, A Padhi, S Stairs, DG Wing, M Tsurugai, T Antonov, A Bashkirov, V Danilov, M Dolgoshein, BA Gladkov, D Sosnovtsev, V Suchkov, S Dementiev, RK Ermolov, PF Golubkov, YA Katkov, II Khein, LA Korotkova, NA Korzhavina, IA Kuzmin, VA Lukina, OY Proskuryakov, AS Shcheglova, LM Solomin, AN Vlasov, NN Zotkin, SA Bokel, C Botje, M Brummer, N Engelen, J Grijpink, S Koffeman, E Kooijman, P Schagen, S van Sighem, A Tassi, E Tiecke, H Tuning, N Velthuis, JJ Vossebeld, J Wiggers, L de Wolf, E Bylsma, B Durkin, LS Gilmore, J Ginsburg, CM Kim, CL Ling, TY Boogert, S Cooper-Sarkar, AM Devenish, RCE Grosse-Knetter, J Matsushita, T Ruske, O Sutton, MR Walczak, R Bertolin, A Brugnera, R Carlin, R Dal Corso, F Dosselli, U Dusini, S Limentani, S Morandin, M Posocco, M Stanco, L Stroili, R Turcato, M Voci, C Adamczyk, L Iannotti, L Oh, BY Okrasinski, JR Saull, PRB Toothacker, WS Whitmore, JJ Iga, Y D'Agostini, G Marini, G Nigro, A Cormack, C Hart, JC McCubbin, NA Shah, TP Epperson, D Heusch, C Sadrozinski, HFW Seiden, A Wichmann, R Williams, DC Pavel, N Abramowicz, H Dagan, S Kananov, S Kreisel, A Levy, A Abe, T Fusayasu, T Umemori, K Yamashita, T Hamatsu, R Hirose, T Inuzuka, M Kitamura, S Nishimura, T Arneodo, M Cartiglia, N Cirio, R Costa, M Ferrero, MI Maselli, S Monaco, V Peroni, C Ruspa, M Sacchi, R Solano, A Staiano, A Dardo, M Bailey, DC Fagerstroem, CP Galea, R Koop, T Levman, GM Martin, JF Orr, RS Polenz, S Sabetfakhri, A Simmons, D Butterworth, JM Catterall, CD Hayes, ME Heaphy, EA Jones, TW Lane, JB West, BJ Ciborowski, J Ciesielski, R Grzelak, G Nowak, RJ Pawlak, JM Pawlak, R Smalska, B Tymieniecka, T Wroblewski, AK Zakrzewski, JA Zarnecki, AF Adamus, M Gadaj, T Deppe, O Eisenberg, Y Hochman, D Karshon, U Badgett, WF Chapin, D Cross, R Foudas, C Mattingly, S Reeder, DD Smith, WH Vaiciulis, A Wildschek, T Wodarczyk, M Deshpande, A Dhawan, S Hughes, VW Bhadra, S Catterall, C Cole, JE Frisken, WR Hall-Wilton, R Khakzad, M Menary, S AF Breitweg, J Chekanov, S Derrick, M Krakauer, D Magill, S Musgrave, B Pellegrino, A Repond, J Stanek, R Yoshida, R Mattingly, MCK Abbiendi, G Anselmo, F Antonioli, P Bari, G Basile, M Bellagamba, L Boscherini, D Bruni, A Bruni, G Romeo, GC Castellini, G Cifarelli, L Cindolo, F Contin, A Coppola, N Corradi, M De Pasquale, S Giusti, P Iacobucci, G Laurenti, G Levi, G Margotti, A Massam, T Nania, R Palmonari, F Pesci, A Polini, A Sartorelli, G Garcia, YZ Zichichi, A Amelung, C Bornheim, A Brock, I Coboken, K Crittenden, J Deffner, R Hartmann, H Heinloth, K Hilger, E Irrgang, P Jakob, HP Kappes, A Katz, UF Kerger, R Paul, E Rautenberg, J Schnurbusch, H Stifutkin, A Tandler, J Voss, KC Weber, A Wieber, H Bailey, DS Barret, O Brook, NH Foster, B Heath, GP Heath, HF McFall, JD Rodrigues, E Scott, J Tapper, RJ Capua, M Mastroberardino, A Schioppa, M Susinno, G Jeoung, HY Kim, JY Lee, JH Lim, IT Ma, KJ Pac, MY Caldwell, A Liu, W Liu, X Mellado, B Paganis, S Sampson, S Schmidke, WB Sciulli, F Chwastowski, J Eskreys, A Figiel, J Klimek, K Olkiewicz, K Piotrzkowski, K Przybycien, MB Stopa, P Zawiejski, L Bednarek, B Jelen, K Kisielewska, D Kowal, AM Kowalski, T Przybycien, M Rulikowska-Zarebska, E Suszycki, L Szuba, D Kotanski, A Bauerdick, LAT Behrens, U Bienlein, JK Borras, K Dannheim, D Desler, K Drews, G Fox-Murphy, A Fricke, U Goebel, F Goers, S Gottlicher, P Graciani, R Haas, T Hain, W Hartner, GF Hasell, D Hebbel, K Kasemann, M Koch, W Kotz, U Kowalski, H Lindemann, L Lohr, B Mankel, R Martinez, M Milite, M Moritz, M Notz, D Pelucchi, F Petrucci, MC Rohde, M Savin, AA Schneekloth, U Selonke, F Sievers, M Stonjek, S Wolf, G Wollmer, U Youngman, C Zeuner, W Coldewey, C Viani, ALD Meyer, A Schlenstedt, S Straub, PB Barbagli, G Gallo, E Pelfer, P Maccarrone, G Votano, L Bamberger, A Benen, A Eisenhardt, S Markun, P Raach, H Wolfle, S Bussey, PJ Bell, M Doyle, AT Lee, SW Lupi, A Macdonald, N McCance, GJ Saxon, DH Sinclair, LE Skillicorn, IO Waugh, R Bohnet, I Gendner, N Holm, U Meyer-Larsen, A Salehi, H Wick, K Garfagnini, A Gialas, I Gladilin, LK Kcira, D Klanner, R Lohrmann, E Poelz, G Zetsche, F Goncalo, R Long, KR Miller, DB Tapper, AD Walker, R Mallik, U Cloth, P Filges, D Ishii, T Kuze, M Nagano, K Tokushuku, K Yamada, S Yamazaki, Y Ahn, SH Lee, SB Park, SK Lim, H Park, IH Son, D Barreiro, F Garcia, G Glasman, C Gonzalez, O Labarga, L del Peso, J Redondo, I Terron, J Barbi, M Corriveau, F Hanna, DS Ochs, A Padhi, S Stairs, DG Wing, M Tsurugai, T Antonov, A Bashkirov, V Danilov, M Dolgoshein, BA Gladkov, D Sosnovtsev, V Suchkov, S Dementiev, RK Ermolov, PF Golubkov, YA Katkov, II Khein, LA Korotkova, NA Korzhavina, IA Kuzmin, VA Lukina, OY Proskuryakov, AS Shcheglova, LM Solomin, AN Vlasov, NN Zotkin, SA Bokel, C Botje, M Brummer, N Engelen, J Grijpink, S Koffeman, E Kooijman, P Schagen, S van Sighem, A Tassi, E Tiecke, H Tuning, N Velthuis, JJ Vossebeld, J Wiggers, L de Wolf, E Bylsma, B Durkin, LS Gilmore, J Ginsburg, CM Kim, CL Ling, TY Boogert, S Cooper-Sarkar, AM Devenish, RCE Grosse-Knetter, J Matsushita, T Ruske, O Sutton, MR Walczak, R Bertolin, A Brugnera, R Carlin, R Dal Corso, F Dosselli, U Dusini, S Limentani, S Morandin, M Posocco, M Stanco, L Stroili, R Turcato, M Voci, C Adamczyk, L Iannotti, L Oh, BY Okrasinski, JR Saull, PRB Toothacker, WS Whitmore, JJ Iga, Y D'Agostini, G Marini, G Nigro, A Cormack, C Hart, JC McCubbin, NA Shah, TP Epperson, D Heusch, C Sadrozinski, HFW Seiden, A Wichmann, R Williams, DC Pavel, N Abramowicz, H Dagan, S Kananov, S Kreisel, A Levy, A Abe, T Fusayasu, T Umemori, K Yamashita, T Hamatsu, R Hirose, T Inuzuka, M Kitamura, S Nishimura, T Arneodo, M Cartiglia, N Cirio, R Costa, M Ferrero, MI Maselli, S Monaco, V Peroni, C Ruspa, M Sacchi, R Solano, A Staiano, A Dardo, M Bailey, DC Fagerstroem, CP Galea, R Koop, T Levman, GM Martin, JF Orr, RS Polenz, S Sabetfakhri, A Simmons, D Butterworth, JM Catterall, CD Hayes, ME Heaphy, EA Jones, TW Lane, JB West, BJ Ciborowski, J Ciesielski, R Grzelak, G Nowak, RJ Pawlak, JM Pawlak, R Smalska, B Tymieniecka, T Wroblewski, AK Zakrzewski, JA Zarnecki, AF Adamus, M Gadaj, T Deppe, O Eisenberg, Y Hochman, D Karshon, U Badgett, WF Chapin, D Cross, R Foudas, C Mattingly, S Reeder, DD Smith, WH Vaiciulis, A Wildschek, T Wodarczyk, M Deshpande, A Dhawan, S Hughes, VW Bhadra, S Catterall, C Cole, JE Frisken, WR Hall-Wilton, R Khakzad, M Menary, S CA ZEUS Collaboration TI Measurement of exclusive omega electroproduction at HERA SO PHYSICS LETTERS B LA English DT Article ID CENTRAL TRACKING DETECTOR; ZEUS BARREL CALORIMETER; VECTOR-MESONS; PHOTOPRODUCTION; QCD; CONSTRUCTION; RHO(0); SCATTERING; DESIGN; DEEP AB The exclusive electroproduction of omega mesons, ep --> e omega p, has been studied in the kinematic range 3 < Q(2) < 20 GeV2, 40 < W< 120 GeV and /t/ < 0.6 GeV2 with the ZEUS detector at HERA using an integrated luminosity of 37.7 pb(-1). The omega mesons were identified via the decay omega --> pi(+)pi(-)pi(0). The exclusive cross section in the above kinematic region is sigma(ep-->e omega p) = 0.108 +/- 0.014(stat.) +/- 0.026(syst.) nb. The reaction ep --> e phi p, phi --> pi(+)pi(-)pi(0), has also been measured. The cross sections, as well as the ratios sigma(gamma)(.) (p --> omega p)/sigma(gamma)(.) (0)(-->rho)(p) and sigma(gamma)(.) (p -->omega p)/sigma(gamma)(.) (p -->phi p), are presented as a function of w and Q(2) Thus, for the first time, the properties of omega electroproduction can be compared to those of rho(0),phi and J/psi electroproduction at high W. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Argonne Natl Lab, Argonne, IL 60439 USA. Andrews Univ, Berrien Springs, MI 49104 USA. Univ Bologna, Bologna, Italy. Ist Nazl Fis Nucl, I-40126 Bologna, Italy. Univ Bonn, Inst Phys, D-5300 Bonn, Germany. Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England. Univ Calabria, Dept Phys, I-87036 Cosenza, Italy. Ist Nazl Fis Nucl, I-87036 Cosenza, Italy. Chonnam Natl Univ, Kwangju, South Korea. Columbia Univ, Nevis Lab, Irvington, NY USA. Inst Nucl Phys, Krakow, Poland. Acad Min & Met, Fac Phys & Nucl Tech, Krakow, Poland. Jagiellonian Univ, Dept Phys, Krakow, Poland. DESY, Deutsch Elektronen Synchrotron, D-2000 Hamburg, Germany. DESY Zeuthen, Zeuthen, Germany. Univ Florence, Florence, Italy. Ist Nazl Fis Nucl, I-50125 Florence, Italy. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Freiburg, Fak Phys, D-7800 Freiburg, Germany. Univ Glasgow, Dept Phys & Astron, Glasgow, Lanark, Scotland. Univ Hamburg, Inst Expt Phys 1, Hamburg, Germany. Univ Hamburg, Inst Expt Phys 2, D-2000 Hamburg, Germany. Univ London Imperial Coll Sci Technol & Med, High Nucl Phys Grp, London, England. Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA. Forschungszentrum, Inst Kernphys, Julich, Germany. KEK, Inst Particle & Nucl Studies, Tsukuba, Ibaraki, Japan. Korea Univ, Seoul 136701, South Korea. Kyungpook Natl Univ, Taegu 702701, South Korea. Univ Autonoma Madrid, Dept Fis Teor, Madrid, Spain. McGill Univ, Dept Phys, Montreal, PQ, Canada. Meiji Gakuin Univ, Fac Gen Educ, Yokohama, Kanagawa, Japan. Moscow Engn Phys Inst, Moscow 115409, Russia. Moscow MV Lomonosov State Univ, Inst Nucl Phys, Moscow, Russia. NIKHEF, Amsterdam, Netherlands. Univ Amsterdam, Amsterdam, Netherlands. Ohio State Univ, Dept Phys, Columbus, OH 43210 USA. Univ Oxford, Dept Phys, Oxford, England. Univ Padua, Dipartimento Fis, Padua, Italy. Ist Nazl Fis Nucl, Padua, Italy. Penn State Univ, Dept Phys, University Pk, PA 16802 USA. Polytech Univ, Sagamihara, Kanagawa, Japan. Univ Roma La Sapienza, Dipartimento Fis, Rome, Italy. Ist Nazl Fis Nucl, Rome, Italy. Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England. Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA. Univ Siegen, Fachbereich Phys, D-5900 Siegen, Germany. Tel Aviv Univ, Sch Phys, Raymond & Beverly Sackler Fac Exact Sci, IL-69978 Tel Aviv, Israel. Univ Tokyo, Dept Phys, Tokyo 113, Japan. Tokyo Metropolitan Univ, Dept Phys, Tokyo, Japan. Univ Turin, Dipartimento Fis Sperimentale, Turin, Italy. Ist Nazl Fis Nucl, I-10125 Turin, Italy. Univ Turin, Fac Sci 2, Alessandria, Italy. Ist Nazl Fis Nucl, Alessandria, Italy. Univ Toronto, Dept Phys, Toronto, ON, Canada. UCL, Dept Phys & Astron, London, England. Warsaw Univ, Inst Phys Expt, Warsaw, Poland. Inst Nucl Studies, PL-00681 Warsaw, Poland. Weizmann Inst Sci, Dept Particle Phys, Rehovot, Israel. Univ Wisconsin, Dept Phys, Madison, WI 53706 USA. Yale Univ, Dept Phys, New Haven, CT USA. York Univ, Dept Phys, Toronto, ON M3J 2R7, Canada. IROE, Florence, Italy. Univ Tokyo, Tokyo, Japan. RP Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM b.foster@bristol.ac.uk RI Solomin, Anatoly/C-3072-2016; Suchkov, Sergey/M-6671-2015; dusini, stefano/J-3686-2012; Goncalo, Ricardo/M-3153-2016; Graciani Diaz, Ricardo/I-5152-2016; Capua, Marcella/A-8549-2015; De Pasquale, Salvatore/B-9165-2008; Wing, Matthew/C-2169-2008; Bashkirov, Vladimir/A-4818-2008; Doyle, Anthony/C-5889-2009; Golubkov, Yury/E-1643-2012; Proskuryakov, Alexander/J-6166-2012; Dementiev, Roman/K-7201-2012; Katz, Uli/E-1925-2013; Wiggers, Leo/B-5218-2015; Morandin, Mauro/A-3308-2016; Tassi, Enrico/K-3958-2015; Gladilin, Leonid/B-5226-2011 OI dusini, stefano/0000-0002-1128-0664; Goncalo, Ricardo/0000-0002-3826-3442; Graciani Diaz, Ricardo/0000-0001-7166-5198; Kasemann, Matthias/0000-0002-0429-2448; Bailey, David C/0000-0002-7970-7839; Castellini, Guido/0000-0002-0177-0643; Capua, Marcella/0000-0002-2443-6525; Arneodo, Michele/0000-0002-7790-7132; Abbiendi, Giovanni/0000-0003-4499-7562; De Pasquale, Salvatore/0000-0001-9236-0748; Doyle, Anthony/0000-0001-6322-6195; Katz, Uli/0000-0002-7063-4418; Wiggers, Leo/0000-0003-1060-0520; Morandin, Mauro/0000-0003-4708-4240; Gladilin, Leonid/0000-0001-9422-8636 NR 40 TC 56 Z9 56 U1 0 U2 3 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 AUG 17 PY 2000 VL 487 IS 3-4 BP 273 EP 288 DI 10.1016/S0370-2693(00)00794-2 PG 16 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 349LM UT WOS:000089046600008 ER PT J AU Halthore, RN Schwartz, SE AF Halthore, RN Schwartz, SE TI Comparison of model-estimated and measured diffuse downward irradiance at surface in cloud-free skies SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID SUN-PHOTOMETRIC MEASUREMENTS; SOLAR-RADIATION; ATMOSPHERIC ABSORPTION; MULTIPLE-SCATTERING; WATER-VAPOR; UNCERTAINTIES; FLUXES; PHYSICS; ENERGY; BUDGET AB Diffuse downward shortwave irradiance at the surface arises from the scattering of radiation by molecules and aerosol particles. Recently, we reported that pyranometer-measuure diffuse solar irradiance in cloud-free atmospheres is overestimated by radiative transfer models at two low-altitude sites by an amount that exceeds modeling and measurement uncertainties but is correctly estimated within these uncertainties at two high-altitude sites [Halthore el al., 1998]. Here we explore this phenomenon in detail, with more cases and improved uncertainty analysis, confirming that the excess in modeled diffuse irradiance cannot be explained by uncertainties in measurements or aerosol-scattering properties that are input into the radiative transfer models or by errors in multiple-scattering schemes. The phenomenon is observed for all comparisons with data obtained intermittently over a 5-year period at the low-altitude sites. Model computations also exceed radiometer-measured sky radiance along the solar almucantar. Despite the inconsistencies between measured and modeled diffuse irradiance, atmospheric transmittance models correctly compute direct normal solar irradiance at all sites. These results indicate that at low altitudes a continuum atmospheric absorption process accounting for 0.022 +/- 0.01 in vertical optical thickness at 550 nm, corresponding to 4 +/- 2% absorptance, may need to be included in radiative transfer models and in models that retrieve aerosol optical thickness from extinction measurements. This is a substantial excess absorption with major implications for climate modeling and weather forecasting. In remote sensing studies, neglect of this excess absorption would lead to substantial errors in satellite sensor calibration and satellite inferred top-of-atmosphere flux. An agent or process for this absorption has not yet been identified. C1 Brookhaven Natl Lab, Dept Environm Sci, Div Atmospher Sci, Upton, NY 11973 USA. RP Halthore, RN (reprint author), Brookhaven Natl Lab, Dept Environm Sci, Div Atmospher Sci, Bldg 815E, Upton, NY 11973 USA. EM halthore@bnl.gov RI Schwartz, Stephen/C-2729-2008 OI Schwartz, Stephen/0000-0001-6288-310X NR 47 TC 48 Z9 53 U1 0 U2 5 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 AUG 16 PY 2000 VL 105 IS D15 BP 20165 EP 20177 DI 10.1029/2000JD900224 PG 13 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA 347LG UT WOS:000088930600033 ER PT J AU Wang, LS Boldyrev, AI Li, X Simons, J AF Wang, LS Boldyrev, AI Li, X Simons, J TI Experimental observation of pentaatomic tetracoordinate planar carbon-containing molecules SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID GAUSSIAN-BASIS SETS; ORBITAL METHODS; GREEN-FUNCTION; AB-INITIO; ATOMS; CLUSTER; STABILIZATION; EXCHANGE; ELEMENTS; ENERGY AB The first neutral pentaatomic tetracoordinate planar carbon molecules, CAl3Si and CAl3Ge, as well as their anions, CAl3Si- and CAl3Ge-, were experimentally observed in the gas-phase and characterized by ab initio calculations and anion photoelectron spectroscopy. A four-center bond involving ligand-ligand interactions was found to be critical in stabilizing the planar structures of the 17-valence-electron CAl3Si and CAl3Ge and 18-valence-electron CAl3Si- and CAl3Ge-. These species violate the conventional expectation of tetrahedral structure for tetracoordinate carbon atoms and thus extend our concept of the range of chemical bonds that carbon can form. C1 Washington State Univ, Dept Phys, Richland, WA 99352 USA. Pacific NW Natl Lab, WR Wiley Environm Mol Sci Lab, Richland, WA 99352 USA. Utah State Univ, Dept Chem & Biochem, Logan, UT 84322 USA. Utah State Univ, Dept Chem, Logan, UT 84112 USA. RP Wang, LS (reprint author), Washington State Univ, Dept Phys, Richland, WA 99352 USA. RI Boldyrev, Alexander/C-5940-2009 OI Boldyrev, Alexander/0000-0002-8277-3669 NR 36 TC 146 Z9 147 U1 3 U2 18 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 AUG 16 PY 2000 VL 122 IS 32 BP 7681 EP 7687 DI 10.1021/ja993081b PG 7 WC Chemistry, Multidisciplinary SC Chemistry GA 347TW UT WOS:000088946100008 ER PT J AU Beckhaus, HD Faust, R Matzger, AJ Mohler, DL Rogers, DW Ruchardt, C Sawhney, AK Verevkin, SP Vollhardt, KPC Wolff, S AF Beckhaus, HD Faust, R Matzger, AJ Mohler, DL Rogers, DW Ruchardt, C Sawhney, AK Verevkin, SP Vollhardt, KPC Wolff, S TI The heat of hydrogenation of (a) cyclohexatriene SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID AROMATIC CHARACTER; BOND ALTERNATION; CYCLIC PI; PHENYLENES; ANTIAROMATICITY; TRICARBONYL; BENZENE; TRIS(BENZOCYCLOBUTADIENO)BENZENE; CYCLOBUTADIENE; DELOCALIZATION C1 Univ Freiburg, Inst Organ Chem & Biochem, D-79104 Freiburg, Germany. Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Chem Sci, Dept Chem, Berkeley, CA 94720 USA. Long Isl Univ, Dept Chem, Brooklyn, NY 11201 USA. RP Vollhardt, KPC (reprint author), Univ Freiburg, Inst Organ Chem & Biochem, Albertstr 21, D-79104 Freiburg, Germany. RI Verevkin, Sergey/G-3243-2011; Faust, Rudiger/K-4891-2014; Matzger, Adam/G-7497-2016 OI Faust, Rudiger/0000-0002-9231-591X; Matzger, Adam/0000-0002-4926-2752 NR 45 TC 43 Z9 43 U1 0 U2 6 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 AUG 16 PY 2000 VL 122 IS 32 BP 7819 EP 7820 DI 10.1021/ja001274p PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 347TW UT WOS:000088946100028 ER PT J AU Song, XD Shi, J Swanson, B AF Song, XD Shi, J Swanson, B TI Flow cytometry-based biosensor for detection of multivalent proteins SO ANALYTICAL BIOCHEMISTRY LA English DT Article ID TOXINS AB Microsphere-based how cytometric detection of cholera toxin (CT) through distance-dependent fluorescence resonant energy transfer (FRET) has been developed. Simultaneous double-fluorescence changes induced by multivalent interactions between CT and fluorophore (both fluorescence donor and acceptor)labeled ganglioside GM1 on a biomimetic membrane surface (supported bilayers of phospholipids) can be measured by a commercial flow cytometer, providing a convenient and sensitive detection method for CT. The flow cytometry-based biosensor is capable of detecting less than 10 pM CT within 30 min. The signal generation strategy coupled with flow cytometry also provides a convenient method for kinetic studies of multivalent interactions. The surface density and the ratio of donor/acceptor-labeled GM1 on the surfaces of phospholipid bilayers are optimized to achieve high sensitivity. (C) 2000 Academic Press. C1 Univ Calif Los Alamos Natl Lab, Biosci Div, Los Alamos, NM 87544 USA. RP Song, XD (reprint author), Univ Calif Los Alamos Natl Lab, Biosci Div, MS J585, Los Alamos, NM 87544 USA. NR 15 TC 42 Z9 47 U1 0 U2 9 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0003-2697 J9 ANAL BIOCHEM JI Anal. Biochem. PD AUG 15 PY 2000 VL 284 IS 1 BP 35 EP 41 DI 10.1006/abio.2000.4664 PG 7 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA 347VA UT WOS:000088948800006 PM 10933853 ER PT J AU Hierlemann, A Ricco, AJ Bodenhofer, K Dominik, A Gopel, W AF Hierlemann, A Ricco, AJ Bodenhofer, K Dominik, A Gopel, W TI Conferring selectivity to chemical sensors via polymer side-chain selection: Thermodynamics of vapor sorption by a set of polysiloxanes on thickness-shear mode resonators SO ANALYTICAL CHEMISTRY LA English DT Article ID GAS-LIQUID-CHROMATOGRAPHY; ACOUSTIC-WAVE; MOLECULAR RECOGNITION; PATTERN-RECOGNITION; SORBENT COATINGS; ORGANIC VAPORS; SYSTEMS; ARRAYS; POLY(DIMETHYLSILOXANE); ENTHALPIES AB Entropy of mixing is shown to be the driving interaction for the endothermic physisorption process of organic vapor partitioning into seven systematically side-chain-modified (polar, acidic, basic, polarizable side groups and groups interacting via H-bridges) polysiloxanes on thickness-shear mode resonators. Each sensor was exposed to seven analytes, selected for their diversity of functional groups. This systematic investigation of sorption yields benchmarking data on physisorption selectivity: response data and modeling reveal a direct correlation of partition coefficients with interactions between specific polymer side chains and analyte functional groups. Partition coefficients were determined for every polymer/analyte pairing over the 273-343 K range at 10 K intervals; from partition coefficient temperature dependence, overall absorption enthalpies and entropies were calculated. By subtracting the enthalpy and entropy of condensation for a given pure analyte, its mixing entropy (primarily combinatorial) and mixing enthalpy (associated with intermolecular interactions) with each polymer matrix were determined. These two crucial thermodynamic parameters determine the chemical selectivity patterns of the polymers for the analytes. Simple molecular modeling based on the polymer contact surface share of the modified side group or the introduced functional group reveals a direct correlation between the partition coefficients and the side-group variation. C1 Sandia Natl Labs, Microsensor Res & Dev Dept, Albuquerque, NM 87185 USA. Univ Tubingen, Inst Phys & Theoret Chem, D-72076 Tubingen, Germany. RP Sandia Natl Labs, Microsensor Res & Dev Dept, POB 5800, Albuquerque, NM 87185 USA. EM hierlema@iqe.phys.ethz.ch RI Hierlemann, Andreas/A-7046-2008; Ricco, Antonio/A-5273-2010; Dominik, Andreas/F-5179-2015; OI Hierlemann, Andreas/0000-0002-3838-2468; Dominik, Andreas/0000-0002-9368-0812; Ricco, Antonio/0000-0002-2355-4984 NR 63 TC 54 Z9 57 U1 1 U2 5 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 AUG 15 PY 2000 VL 72 IS 16 BP 3696 EP 3708 DI 10.1021/ac991298i PG 13 WC Chemistry, Analytical SC Chemistry GA 343NV UT WOS:000088709200003 ER PT J AU Duhachek, SD Kenseth, JR Casale, GP Small, GJ Porter, MD Jankowiak, R AF Duhachek, SD Kenseth, JR Casale, GP Small, GJ Porter, MD Jankowiak, R TI Monoclonal antibody-gold biosensor chips for detection of depurinating carcinogen-DNA adducts by fluorescence line-narrowing spectroscopy SO ANALYTICAL CHEMISTRY LA English DT Article ID SELF-ASSEMBLED MONOLAYERS; SCANNING FORCE MICROSCOPY; BLOOD-CELL DNA; CAPACITANCE MEASUREMENTS; COVALENT IMMOBILIZATION; PROTEIN ADSORPTION; SURFACE; ELECTROPHORESIS; IDENTIFICATION; BENZOPYRENE AB A new direct readout methodology for detection and quantitation of fluorescent carcinogen-DNA adducts is described. It combines the binding specificity of an immobilized monoclonal antibody (MAb) with high-resolution, low-temperature fluorescence spectroscopy. The MAb, which is covalently bound to a gold surface via a chemisorbed disulfide coupling agent, binds the adduct of interest in an aqueous sample. Laser-induced fluorescence under nonline narrowing (FNLN) and Line-narrowing (FLN) conditions was used to detect (benzo[a]pyren-6-yl)guanine (BP-6-N7Gua) bound to immobilized MAb. At room temperature, the BP-6-N7Gua fluorescence was not detected, most likely because of quenching by the gold surface and/or efficient dynamical quenching. However, fluorescence was observed at room temperature when the surface was covered with a thin layer of glycerol, and possible reasons for the fluorescence enhancement are considered. Lowering of the temperature to 77 K led to nearly an order of magnitude increase in fluorescence intensity. Highly structured FLN spectra obtained at 4.2 K allowed for definitive adduct identification. The potential of this methodology for risk assessments of individuals exposed to polycyclic aromatic hydrocarbons is discussed. C1 US DOE, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Microanalyt Instrumentat Ctr, Dept Chem, Ames, IA 50011 USA. Univ Nebraska, Med Ctr, Eppley Inst Res Canc & Allied Dis, Omaha, NE 68198 USA. RP Jankowiak, R (reprint author), US DOE, Ames Lab, Ames, IA 50011 USA. FU NCI NIH HHS [P01 CA49210] NR 66 TC 42 Z9 42 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD AUG 15 PY 2000 VL 72 IS 16 BP 3709 EP 3716 DI 10.1021/ac000472w PG 8 WC Chemistry, Analytical SC Chemistry GA 343NV UT WOS:000088709200004 PM 10959953 ER PT J AU Gotmar, G Fornstedt, T Guiochon, G AF Gotmar, G Fornstedt, T Guiochon, G TI Retention mechanism of beta-blockers on an immobilized cellulase. Relative importance of the hydrophobic and ionic contributions to their enantioselective and nonselective interactions SO ANALYTICAL CHEMISTRY LA English DT Article ID CHIRAL STATIONARY PHASE; AMINO-ACID-RESIDUES; CELLOBIOHYDROLASE-I; TRICHODERMA-REESEI; PROPRANOLOL ENANTIOMERS; CRYSTAL-STRUCTURES; CBH-I; SEPARATION; RECOGNITION; RESOLUTION AB The adsorption isotherms of the enantiomers of three P-blockers, metoprolol, alprenolol, and propranolol, were measured on cellobiohydrolase I (CBH I) immobilized on silicagel, in the concentration range between 0.25 mu M and 1.7 mM, at pH = 5.0, 5.5, and 6.0, In agreement with previous results, these data are accounted for by a two-sites physical model and fit closely to a Bilangmuir equation. The saturation capacities and the binding constants were determined for each enantiomer on the chiral and the nonchiral sites. The chiral sites are shown to be strongly ionic, in contrast to the nonchiral ones, which are mainly hydrophobic, However, the chiral binding of (S)-propranolol is endothermic, with a high adsorption entropy, in contrast to the chiral interactions of (R)-propranolol and to the nonchiral interactions, which are all exothermic, This indicates that hydrophobic interactions also play a role in the chiral binding. The dependence of the adsorption parameters on the hydrophobicity of the solute is discussed and interpreted in terms of the retention mechanism. The results are compared with the structure of the protein, recently elucidated by X-ray crystallography. C1 Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Dept Pharm, S-75123 Uppsala, Sweden. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RP Guiochon, G (reprint author), Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. NR 24 TC 57 Z9 57 U1 1 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD AUG 15 PY 2000 VL 72 IS 16 BP 3908 EP 3915 DI 10.1021/ac9914824 PG 8 WC Chemistry, Analytical SC Chemistry GA 343NV UT WOS:000088709200032 PM 10959981 ER PT J AU Berry, EA Zhang, Z Bellamy, HD Huang, L AF Berry, EA Zhang, Z Bellamy, HD Huang, L TI Crystallographic location of two Zn2+-binding sites in the avian cytochrome bc(1) complex SO BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS LA English DT Article; Proceedings Paper CT 11th European Bioenergetics Conference (EBEC) CY SEP 09-14, 2000 CL UNIV SUSSEX, BRIGHTON, ENGLAND HO UNIV SUSSEX ID BOVINE HEART-MITOCHONDRIA; C REDUCTASE; PROCESSING PEPTIDASE; PROTEIN; OXIDATION; PROGRAM; FAMILY AB The chicken mitochondrial ubiquinol cytochrome c oxidoreductase (bc(1) complex) is inhibited by Zn2+ ions, but with higher K-i (similar to 3 mu M) than the corresponding bovine enzyme. When equilibrated with mother liquor containing 200 mu M ZnCl2 for 7 days, the crystalline chicken bet complex specifically binds Zn2+ at 4 sites representing two sites on each monomer in the dimer. These two sites are close to the stigmatellin-binding site, taken to be center Q(o) of the Q-cycle mechanism, and are candidates for the inhibitory site. One binding site is actually in the hydrophobic channel between the Q(o) site and the bulk lipid phase, and may interfere with quinone binding. The other is in a hydrophilic area between cytochromes b and c(1), and might interfere with the egress of protons from the Q(o) site to the intermembrane aqueous medium. No zinc was bound near the putative proteolytic active site of subunits 1 and 2 (homologous to mitochondrial processing peptidase) under these conditions. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Grad Grp Biophys, Berkeley, CA 94720 USA. Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. RP Berry, EA (reprint author), Melvin Calvin Lab, Phys Biosci Lab, 1 Cyclotron Rd,MS 3-250J, Berkeley, CA 94720 USA. FU NIDDK NIH HHS [R01DK44842] NR 23 TC 57 Z9 59 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0005-2728 J9 BBA-BIOENERGETICS JI Biochim. Biophys. Acta-Bioenerg. PD AUG 15 PY 2000 VL 1459 IS 2-3 BP 440 EP 448 DI 10.1016/S0005-2728(00)00182-1 PG 9 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA 348RW UT WOS:000089001100027 PM 11004461 ER PT J AU DePaolo, DJ Daley, EE AF DePaolo, DJ Daley, EE TI Neodymium isotopes in basalts of the southwest basin and range and lithospheric thinning during continental extension SO CHEMICAL GEOLOGY LA English DT Review DE isotopes; basalts; lithospheric thinning ID WESTERN UNITED-STATES; RIO-GRANDE RIFT; FISSION-TRACK ANALYSIS; GREAT-BASIN; CRUSTAL EXTENSION; VOLCANIC FIELD; TECTONIC DENUDATION; SOUTHERN NEVADA; VALLEY CALDERA; MOJAVE DESERT AB The chemical compositions, ages, and Nd and Sr isotopic compositions of Miocene basaltic volcanic rocks from the southwestern Basin and Range Province were measured. The data presented, and other data obtained from the literature show that temporal variations in the Nd and Sr isotopic compositions are typically correlated with the timing of local crustal extension. The isotopic variations cannot be accounted for by crustal contamination, and are best interpreted as indicating the involvement of subcontinental lithospheric mantle as a major source of basalt magma before and during the early stages of extension, giving way to asthenospheric sources as extension proceeds. It is inferred that the basalt isotopic and age data provide information about the amount and timing of changes of the overall lithosphere thickness during extension. If this inference is valid, the inferred lithosphere thickness vs. time histories can be compared to the amount and timing of upper crustal extension to evaluate competing models for lithospheric strain during continental extension. The depth of the lithosphere-asthenospshere boundary is inferred primarily from the isotopic data, but can be refined by accounting for differences in the depth of origin of the basalts as suggested by differences in the degree of silica saturation (nepheline normative vs, hypersthene normative). The transition between silica saturated and undersaturated magmas is dependent on many factors, but for the conditions Likely to apply to the Basin and Range Miocene volcanism, it corresponds to a depth of origin of 50 +/- 10 km. The data presented show strong support for the inferred mantle geochemical stratigraphy, and the inferred modem depths to the lithosphere-asthenosphere boundary are consistent with available seismic refraction and structural data In the highly extended regions near the eastern and western margins of the southwestern Basin and Range, temporal changes in basalt isotopic compositions indicate that the subjacent lithospheric mantle thinned contemporaneously with the upper crust, as would be predicted for pure shear. These areas are also characterized by relatively high (although still low) basalt extrusion rates. In contrast, upper crustal extension in the Death Valley area was not accompanied by significant thinning of the subjacent lithospheric mantle, which implies that the location of lithospheric thinning was offset from the location of upper crustal extension as in a simple shear model. The total amount of lithospheric thinning is generally less than would be expected from the magnitude of upper crustal extension and is more evenly distributed; this suggests that there is also a component of distributed shear. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Calif Berkeley, Dept Earth & Planetary Sci, Ctr Isotope Geochem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA. RP DePaolo, DJ (reprint author), Univ Calif Berkeley, Dept Earth & Planetary Sci, Ctr Isotope Geochem, McCone Hall MS 4767, Berkeley, CA 94720 USA. NR 106 TC 120 Z9 161 U1 2 U2 17 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2541 J9 CHEM GEOL JI Chem. Geol. PD AUG 15 PY 2000 VL 169 IS 1-2 BP 157 EP 185 DI 10.1016/S0009-2541(00)00261-8 PG 29 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 347QU UT WOS:000088941300011 ER PT J AU Chialvo, AA Yezdimer, E Driesner, T Cummings, PT Simonson, JM AF Chialvo, AA Yezdimer, E Driesner, T Cummings, PT Simonson, JM TI The structure of water from 25 degrees C to 457 degrees C: comparison between neutron scattering and molecular simulation SO CHEMICAL PHYSICS LA English DT Article ID LIQUID WATER; DYNAMICS SIMULATION; POLARIZABLE WATER; POTENTIAL FUNCTIONS; MODEL AB The microstructure of water as predicted by four rather different water intermolecular potential models, two flexible (BJH and SPC-mTR) and two polarizable (TIP4P-FQ and PPC), is compared against the corresponding newest neutron scattering data in a wide range of state conditions. The purpose of this study is to assess the reliability of current, more complex potential models for the simulation of water at high temperature, and consequently, to gain some insight into the impact of flexibility and polarizability on the thermodynamic and structural properties as a function of state conditions. The comparison clearly indicates the superiority of polarizable over (simply) flexible water models to properly describe structure and polarization (enhancement of the molecular dipole over that of the monomer), (C) 2000 Elsevier Science B.V. All rights reserved. C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. Univ Tennessee, Dept Chem Engn, Knoxville, TN 37996 USA. Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. ETH Zurich, ETH Zentrum NO, CH-8092 Zurich, Switzerland. Univ Tennessee, Dept Chem Engn, Knoxville, TN 37996 USA. Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Univ Tennessee, Dept Comp Sci, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem Technol, Oak Ridge, TN 37831 USA. RP Chialvo, AA (reprint author), Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RI Cummings, Peter/B-8762-2013; Driesner, Thomas/N-6361-2016; OI Cummings, Peter/0000-0002-9766-2216; Chialvo, Ariel/0000-0002-6091-4563 NR 37 TC 30 Z9 32 U1 3 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 J9 CHEM PHYS JI Chem. Phys. PD AUG 15 PY 2000 VL 258 IS 2-3 BP 109 EP 120 DI 10.1016/S0301-0104(00)00131-2 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 347WV UT WOS:000088952900003 ER PT J AU Xantheas, SS AF Xantheas, SS TI Cooperativity and hydrogen bonding network in water clusters SO CHEMICAL PHYSICS LA English DT Article ID ROTATION TUNNELING SPECTROSCOPY; TERAHERTZ LASER SPECTROSCOPY; MANY-BODY INTERACTIONS; AB-INITIO; ICE IH; MOLECULAR-INTERACTIONS; BASIS-SETS; BONDED PATTERN; LIQUID WATER; CAGE FORM AB Clusters of water molecules are held together by hydrogen bonding networks. These networks are differentiated by the participation of the individual water molecules in the hydrogen bonds either as proton donors (d), proton accepters (a) or their combinations, It has long been assumed that the stability of clusters is determined by the dominant two-body interactions between the water molecules. We have found that homodromic hydrogen bonding networks, i.e. those exhibiting donor-acceptor (da) arrangements between all water molecules, are associated with the largest nonadditivities among other networks present in low lying minima of small water clusters. This finding offers a novel explanation for the stability of homodromic rings that are the global minima for the clusters trimer through pentamer. Among the non-additive terms, three-body terms are mainly responsible for determining the relative stabilities between the various trimer through pentamer isomers. This suggests that purely two-body pairwise additive potentials will result in errors exceeding 20% for clusters larger than the pentamer. Among all higher order components, the three-body term was found to be the most important. (C) 2000 Published by Elsevier Science B.V. All rights reserved. C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. RP Xantheas, SS (reprint author), Pacific NW Natl Lab, Environm Mol Sci Lab, 906 Battelle Blvd,POB 999,MS K8-91, Richland, WA 99352 USA. RI Xantheas, Sotiris/L-1239-2015; OI Xantheas, Sotiris/0000-0002-6303-1037 NR 52 TC 274 Z9 281 U1 5 U2 70 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 J9 CHEM PHYS JI Chem. Phys. PD AUG 15 PY 2000 VL 258 IS 2-3 BP 225 EP 231 DI 10.1016/S0301-0104(00)00189-0 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 347WV UT WOS:000088952900012 ER PT J AU Smith, RS Dohnalek, Z Kimmel, GA Stevenson, KP Kay, BD AF Smith, RS Dohnalek, Z Kimmel, GA Stevenson, KP Kay, BD TI The self-diffusivity of amorphous solid water near 150 K SO CHEMICAL PHYSICS LA English DT Article ID SUPERCOOLED WATER; LIQUID WATER; GLASS-TRANSITION; LOW-TEMPERATURES; PHASE-BEHAVIOR; MOLECULAR-BEAM; HEAT-CAPACITY; ICE; CRYSTALLIZATION; H2O AB Molecular beam techniques are used to create nanoscale thin films composed of different isotopes of amorphous solid water (ASW). The metastable ASW composites are then heated above the glass transition temperature, T-g, and the extent of isotopic intermixing is determined using temperature programmed desorption. The observed self-diffusion in the 150-160 K range is roughly a millionfold greater than that expected for crystalline ice. The magnitude and temperature dependence of the self-diffusivity are consistent with an amorphous solid that melts into a deeply supercooled liquid prior to crystallization. The overall temperature dependence for the diffusivity of liquid water, supercooled liquid water (238-273 K), and of ASW (150-160 K) is well described by the Vogel-Fulcher-Tamman equation. These results suggest that ASW above its T-g is a deeply supercooled metastable extension of normal liquid water prior to crystallizing near 160 K. Additionally, rapid H/D isotopic exchange occurs in concert with the translational diffusive motion. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. RP Kay, BD (reprint author), Pacific NW Natl Lab, Environm Mol Sci Lab, POB 999,Mail Stop K8-88, Richland, WA 99352 USA. RI Smith, Scott/G-2310-2015; OI Smith, Scott/0000-0002-7145-1963; Kimmel, Greg/0000-0003-4447-2440; Dohnalek, Zdenek/0000-0002-5999-7867 NR 48 TC 74 Z9 75 U1 0 U2 23 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 J9 CHEM PHYS JI Chem. Phys. PD AUG 15 PY 2000 VL 258 IS 2-3 BP 291 EP 305 DI 10.1016/S0301-0104(00)00130-0 PG 15 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 347WV UT WOS:000088952900018 ER PT J AU Hummer, G Garde, S Garcia, AE Pratt, LR AF Hummer, G Garde, S Garcia, AE Pratt, LR TI New perspectives on hydrophobic effects SO CHEMICAL PHYSICS LA English DT Review ID TEMPERATURE-DEPENDENCE; COMPUTER-SIMULATION; WATER-STRUCTURE; PROTEIN STABILITY; SURFACE-TENSION; CONFORMATIONAL EQUILIBRIA; SOLVATION THERMODYNAMICS; PRESSURE DENATURATION; MOLECULAR-DYNAMICS; DISORDERED WATER AB Recent breakthroughs in the theory of hydrophobic effects permit new analyses of several characteristics of hydrophobic hydration and interaction. Heat capacities of non-polar solvation, and their temperature dependences, are analyzed within an information theory approach, using experimental information available from bulk liquid water. Non-polar solvation in aqueous electrolytes is studied by computer simulations, and interpreted within the information theory, We also study the preferential solvation of small non-polar molecules in heavy water (D2O) relative to light water (H2O) and find that this revealing difference can be explained by the higher compressibility of D2O. We develop a quasi-chemical description of hydrophobic hydration that incorporates the hydration structure and permits quantum-mechanical treatment of the solute. Finally, these new results are discussed in the context of hydrophobic effects in protein stability and folding, and of mesoscopic hydrophobic effects such as dewetting. (C) 2000 Elsevier Science B.V. All rights reserved. C1 NIDDKD, Chem Phys Lab, NIH, Bethesda, MD 20892 USA. Rensselaer Polytech Inst, Dept Chem Engn, Troy, NY 12180 USA. Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Hummer, G (reprint author), NIDDKD, Chem Phys Lab, NIH, Bldg 5,Rm 132, Bethesda, MD 20892 USA. EM hummer@helix.nih.gov RI Garde, Shekhar/C-3060-2008; Pratt, Lawrence/H-7955-2012; Hummer, Gerhard/A-2546-2013 OI Pratt, Lawrence/0000-0003-2351-7451; Hummer, Gerhard/0000-0001-7768-746X NR 134 TC 229 Z9 232 U1 8 U2 75 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 EI 1873-4421 J9 CHEM PHYS JI Chem. Phys. PD AUG 15 PY 2000 VL 258 IS 2-3 BP 349 EP 370 DI 10.1016/S0301-0104(00)00115-4 PG 22 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 347WV UT WOS:000088952900022 ER PT J AU Hanson, AA Li, KM Lin, CH Jankowiak, R Small, GJ Rogan, EG Cavalieri, EL AF Hanson, AA Li, KM Lin, CH Jankowiak, R Small, GJ Rogan, EG Cavalieri, EL TI Synthesis and structure determination of 6-methylbenzo[a]pyrene-deoxyribonucleoside adducts and their identification and quantitation in vitro and in mouse skin SO CHEMICO-BIOLOGICAL INTERACTIONS LA English DT Article DE 6-methylbenzo[a]pyrene-deoxyribunucleoside adducts; mouse skin; carcinogen ID ONE-ELECTRON OXIDATION; RAT-LIVER MICROSOMES; FORMED IN-VITRO; ELECTROCHEMICAL OXIDATION; DNA-ADDUCTS; METABOLIC-ACTIVATION; BENZOPYRENE; DEOXYRIBONUCLEOSIDES; 6-FLUOROBENZOPYRENE; CARCINOGENESIS AB Activation of the moderate L carcinogen 6-methylbenzo[a]pyrene (6-CH3BP) by one-electron oxidation to form DNA adducts was studied. Iodine oxidation of 6-CH3BP in the presence of dGuo produces BP-6-CH2-N(2)dGuo, BP-6-CH2-N7Gua and a mixture of 6-CH3BP-(1&3)-N7Gua, whereas in the presence of Ade the adducts BP-6-CH2-N1Ade, BP-6-CH2-N3Ade, DP-6-CH2-N7Ade and 6-CH3BP-(1&3)-N1Ade are obtained. Furthermore, for the first time an aromatic hydrocarbon radical cation afforded an adduct with dThd, the stable adduct BP-6-CH2-N3dThd. Formation of these adducts indicates that the 6-CH3BP radical cation has charge localized at the 6, 1 and 3 position. When 6-CH3BP was activated by horseradish peroxidase in the presence of DNA, two depurinating adducts were identified, BP-6-CH(2)N7Gua (48%) and 6-CH3BP-(1&3)-N7Gua (23%), with 29% unidentified stable adducts. In the binding of 6-CH3BP catalyzed by rat liver microsomes, the same two depurinating adducts, BP-6-CH2-N7Gua (22%) and 6-CH3BP-(1&3)-N7Gua (10%), were identified, with 68% unidentified stable adducts. In 6-CH3BP-treated mouse skin, the two depurinating adducts, BP-6-CH2-N7Gua and 6-CH3BP-(1&3)-N7Gua, were identified. Although quantitation of these two adducts was not possible due to coelution of metabolites on HPLC, they appeared to be the major adducts found in mouse skin. These results show that 6-CH3BP forms depurinating adducts only with the guanine base of DNA, both in vitro and in mouse skin. The weaker reactivity of 6-CH3BP radical cation vs. BP radical cation could account for the weaker tumor-initiating activity of 6-CH3BP in comparison to that of BP. (C) 2000 Published by Elsevier Science Ireland Ltd. All rights reserved. C1 Univ Nebraska, Med Ctr, Eppley Inst Res Canc, Omaha, NE 68198 USA. Univ Nebraska, Med Ctr, Dept Pharmaceut Sci, Omaha, NE 68198 USA. Iowa State Univ, Dept Chem, Ames, IA 50011 USA. Iowa State Univ, Ames Lab, USDOE, Ames, IA 50011 USA. RP Cavalieri, EL (reprint author), Univ Nebraska, Med Ctr, Eppley Inst Res Canc, Omaha, NE 68198 USA. FU NCI NIH HHS [P01 CA49210, CA36727] NR 28 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0009-2797 J9 CHEM-BIOL INTERACT JI Chem.-Biol. Interact. PD AUG 15 PY 2000 VL 128 IS 1 BP 65 EP 90 DI 10.1016/S0009-2797(00)00189-7 PG 26 WC Biochemistry & Molecular Biology; Pharmacology & Pharmacy; Toxicology SC Biochemistry & Molecular Biology; Pharmacology & Pharmacy; Toxicology GA 357TH UT WOS:000089516600005 PM 10996301 ER PT J AU Canning, A Mannstadt, W Freeman, AJ AF Canning, A Mannstadt, W Freeman, AJ TI Parallelization of the FLAPW method SO COMPUTER PHYSICS COMMUNICATIONS LA English DT Article DE parallelization; full-potential LAPW; FLAPW; density functional theory; total energy ID PLANE-WAVE METHOD; BULK SOLIDS; SURFACES; DENSITY; METALS; LDA AB The FLAPW (full-potential linearized-augmented plane-wave) method is one of the most accurate first-principles methods for determining structural, electronic and magnetic properties of crystals and surfaces. Until the present work, the FLAPW method has been limited to systems of less than about a hundred atoms due to the lack of an efficient parallel implementation to exploit the power and memory of parallel computers. In this work, we present an efficient parallelization of the method by division among the processors of the plane-wave components for each state. The code is also optimized for RISC (reduced instruction set computer) architectures, such as those found on most parallel computers, making full use of BLAS (basic linear algebra subprograms) wherever possible. Scaling results are presented for systems of up to 686 silicon atoms and 343 palladium atoms per unit cell, running on up to 512 processors on a GRAY T3E parallel supercomputer. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Lawrence Berkeley Lab, NERSC, Berkeley, CA 94720 USA. Univ Marburg, Fachbereich Phys, D-35032 Marburg, Germany. Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA. RP Canning, A (reprint author), Lawrence Berkeley Lab, NERSC, Berkeley, CA 94720 USA. EM canning@nersc.gov NR 12 TC 22 Z9 22 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0010-4655 EI 1879-2944 J9 COMPUT PHYS COMMUN JI Comput. Phys. Commun. PD AUG 15 PY 2000 VL 130 IS 3 BP 233 EP 243 DI 10.1016/S0010-4655(00)00120-X PG 11 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA 342JN UT WOS:000088641600001 ER PT J AU Jadach, S Ward, BFL Was, Z AF Jadach, S Ward, BFL Was, Z TI The precision Monte Carlo event generator KK for two-fermion final states in e(+)e(-) collisions SO COMPUTER PHYSICS COMMUNICATIONS LA English DT Article ID QUARK PAIR PRODUCTION; RADIATIVE-CORRECTIONS; BHABHA SCATTERING; CROSS-SECTIONS; PROGRAM BHLUMI; SOFT PHOTONS; LOW ANGLES; Z0 REGION; EXPONENTIATION; SPIN AB We present the Monte Carlo event generator KK version 4.13 for precision predictions of the Electroweak Standard Model for the process e(+)e(-) --> f (f) over bar + ny, f = mu, tau, d, u, s, c, b, at centre-of-mass enemies from tau lepton threshold to 1 TeV, that is for LEP, SLC, future Linear Colliders, b, c, tau-factories, etc. Effects due to photon emission from initial beams and outgoing fermions an calculated in QED up to second order, including all interference effects, within Coherent Exclusive Exponentiation (CEEX), which is based on Yennie-Frautschi-Suura exponentiation. Electroweak corrections are included in first order, with higher-order extensions, using the DIZET 6.21 library. Final-state quarks hadronize according to the parton shower model using JETSET. Beams can be polarized longitudinally and transversely. Decay of the s leptons is simulated using the TAUOLA Library, taking into account spin polarization effects as well. In particular the complete spin correlations density matrix of the initial-state beams and final state tau's is incorporated in an exact manner. Effects due to beamstrahlung are simulated in a realistic way. The main improvements with respect to KORALZ are: (a) inclusion of the initial-final state QED interference, (b) inclusion of the exact matrix element for two photons, and (c) inclusion of the transverse spin correlations in tau decays (as in KORALB). (C) 2000 Elsevier Science B.V. All rights reserved. C1 Inst Nucl Phys, PL-30055 Krakow, Poland. DESY, Div Theory, D-22603 Hamburg, Germany. Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. CERN, Div Theory, CH-1211 Geneva 23, Switzerland. RP Was, Z (reprint author), Inst Nucl Phys, Ul Kawiory 26A, PL-30055 Krakow, Poland. NR 40 TC 381 Z9 387 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0010-4655 J9 COMPUT PHYS COMMUN JI Comput. Phys. Commun. PD AUG 15 PY 2000 VL 130 IS 3 BP 260 EP 325 DI 10.1016/S0010-4655(00)00048-5 PG 66 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA 342JN UT WOS:000088641600003 ER PT J AU Pevzner, P Istrail, S Shamir, R AF Pevzner, P Istrail, S Shamir, R TI Special issue: Combinatorial molecular biology - Foreword SO DISCRETE APPLIED MATHEMATICS LA English DT Editorial Material C1 Univ So Calif, Dept Math, Los Angeles, CA 90089 USA. Sandia Natl Labs, Dept Algorithms & Discrete Math, Albuquerque, NM 87185 USA. Tel Aviv Univ, Sch Math, IL-69978 Tel Aviv, Israel. RP Pevzner, P (reprint author), Univ So Calif, Dept Math, DRB 155,1042 W 36th Pl, Los Angeles, CA 90089 USA. RI Shamir, Ron/E-6514-2011 NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-218X J9 DISCRETE APPL MATH JI Discret Appl. Math. PD AUG 15 PY 2000 VL 104 IS 1-3 BP 1 EP 2 PG 2 WC Mathematics, Applied SC Mathematics GA 345KD UT WOS:000088814400001 ER PT J AU VanBriesen, JM Rittmann, BE Xun, L Girvin, DC Bolton, H AF VanBriesen, JM Rittmann, BE Xun, L Girvin, DC Bolton, H TI The rate-controlling substrate of nitrilotriacetate for biodegradation by Chelatobacter heintzii SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID CHELATOCOCCUS-ASACCHAROVORANS; (NTA)-UTILIZING BACTERIA; ENZYME-SYNTHESIS; WASTE-WATER; RIVER WATER; TRANSPORT; DEGRADATION; SYSTEMS; NTA; MODEL AB Codisoposal of anthropogenic chelating agents such as nitrilotriacetate (NTA) with radio active and heavy metals can enhance environmental transport of the metals, extending subsurface contamination and threatening groundwater sources. The biodegradation of the chelating agent can lead to the immobilization of the chelated metal and radionuclide contaminants. The rate of biodegradation of the organic complexing agent may depend on the concentration of a specific, biologically available form of the chelate. In mixtures of metals and chelating agents, the relative distribution of different chemical forms of the chelate at equilibrium is controlled by the total concentrations of organic and inorganic constituents and thermodynamic stability constants for the aqueous complexes that form. In this paper, we evaluate experimental results for biodegradation of NTA by Chelatobacter heintzii in different metal/NTA systems in order to identify the chelate form controlling the rate of degradation. The CaNTA(-) is the only species that can control the rate of NTA degradation in our systems. Our analysis of the potentially rate-limiting reactions in the biodegradation of NTA indicates that kinetically controlled complexation in the NTA system is not affecting the biodegradation of the chelate. The rate of transport of CaNTA- into the cell appears to control the overall rate of NTA degradation. Thus, we expect enhanced rates of biological degradation of the chelate and immobilization of codisposed metals when CaNTA(-) is available to C. heintzii. C1 Northwestern Univ, Dept Civil Engn, Evanston, IL 60208 USA. Washington State Univ, Dept Microbiol, Pullman, WA USA. Pacific NW Lab, Interfacial Geochem & Environm Microbiol Grp, Richland, WA 99352 USA. RP VanBriesen, JM (reprint author), Carnegie Mellon Univ, Dept Civil & Environm Engn, Pittsburgh, PA 15213 USA. EM jeanne@cmu.edu RI Bolton, Harvey/E-5583-2011 NR 64 TC 16 Z9 16 U1 3 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD AUG 15 PY 2000 VL 34 IS 16 BP 3346 EP 3353 DI 10.1021/es991190k PG 8 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA 344GN UT WOS:000088751000006 ER PT J AU Mincher, BJ Curry, RC Brey, R AF Mincher, BJ Curry, RC Brey, R TI Method to simultaneously improve PCB radiolysis rates in transformer oil and to close the chlorine mass balance SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID GAMMA-RAY DESTRUCTION; POLYCHLORINATED-BIPHENYLS; INDUCED DEGRADATION; IONIZING-RADIATION; DECHLORINATION; 2-PROPANOL; SOLVENTS AB The addition of alkaline 2-propanol to isooctane and transformer oil solutions of PCBs was found to increase the rate of PCB dechlorination by gamma-radiolysis. Simultaneously, it facilitates the closure of the chlorine mass balance. The chlorine liberated from PCBs irradiated in alkaline 2-propanol-spiked solutions precipitated as an inorganic salt in a stoichiometric amount. This was demonstrated for an individual PCB congener (PCB 155) in isooctane and for Aroclor 1260 in transformer oil. Radiolysis rates are reported in terms of dose constants, d (kGy(-1)), the exponential rate constant for PCB decomposition with respect to absorbed dose. These are the highest decomposition rates yet reported for the radiolytic treatment of PCB-contaminated transformer oil. C1 Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. Univ Missouri, Columbia, MO 65211 USA. Idaho State Univ, Pocatello, ID 83209 USA. RP Mincher, BJ (reprint author), Idaho Natl Engn & Environm Lab, POB 1625, Idaho Falls, ID 83415 USA. RI Mincher, Bruce/C-7758-2017 NR 13 TC 14 Z9 14 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD AUG 15 PY 2000 VL 34 IS 16 BP 3452 EP 3455 DI 10.1021/es991095b PG 4 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA 344GN UT WOS:000088751000022 ER PT J AU Van der Woerd, J Ryerson, FJ Tapponnier, P Meriaux, AS Gaudemer, Y Meyer, B Finkel, RC Caffee, MW Zhao, GG Xu, ZQ AF Van der Woerd, J Ryerson, FJ Tapponnier, P Meriaux, AS Gaudemer, Y Meyer, B Finkel, RC Caffee, MW Zhao, GG Xu, ZQ TI Uniform Slip-Rate along the Kunlun Fault: Implications for seismic behaviour and large-scale tectonics SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID SAN-ANDREAS FAULT; ALTYN-TAGH FAULT; LARGE EARTHQUAKES; QUATERNARY; GANSU; CHINA; ASIA; RECURRENCE; CALIFORNIA; QINGHAI AB A long-term slip-rate is derived from concordant Be-10, Al-26 and C-14 dating of cumulative offsets along much of the length of the Kunlun Fault. Values at 6 sites indicate uniform slip (11.5+/-2.0 mm/yr) since similar to 40 kyr BP. This relatively high slip rate corresponds to a first-order discontinuity in the Asian crustal velocity field. M similar to 8 and M similar to 7.5 earthquakes on 2 segments of the fault recur with characteristic slip (similar to 10 +/- 2 m and 4.4 +/- 0.4 m) every similar to 850 and similar to 420 yrs, respectively. C1 Univ Calif Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. Inst Phys Globe Paris, F-75252 Paris, France. China Seismol Bur, Inst Crustal Dynam, Beijing 100085, Peoples R China. Minist Land & Resources, Inst Geol, Beijing 100037, Peoples R China. RP Van der Woerd, J (reprint author), Univ Calif Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, L-202,7000 East Ave, Livermore, CA 94550 USA. RI Meriaux, Anne-Sophie/G-1754-2010; Tapponnier, .Paul/B-7033-2011; Caffee, Marc/K-7025-2015; Meyer, Bertrand/E-6903-2011; Gaudemer, Yves/K-3921-2012 OI Tapponnier, .Paul/0000-0002-7135-1962; Caffee, Marc/0000-0002-6846-8967; NR 19 TC 113 Z9 113 U1 1 U2 14 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD AUG 15 PY 2000 VL 27 IS 16 BP 2353 EP 2356 DI 10.1029/1999GL011292 PG 4 WC Geosciences, Multidisciplinary SC Geology GA 344QZ UT WOS:000088771500001 ER PT J AU Wang, C Richardson, JD Gosling, JT AF Wang, C Richardson, JD Gosling, JT TI Slowdown of the solar wind in the outer heliosphere and the interstellar neutral hydrogen density SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID PICKUP IONS; SHOCK PROPAGATION; MODEL; GAS AB Voyager 2 and Ulysses were at nearly the same latitude in the southern heliosphere at the beginning of 1999 and their radial separation was about 55 AU. The effect of pickup ions should be profound at Voyager's position, especially, the deceleration of the solar wind dow. This unique opportunity allows us to investigate the effect of pickup ions based on direct multi-spacecraft observations. The Ulysses observations were used as input into a 1-dimensional MHD numerical model. We run cases with and without pickup ions in an attempt to estimate the slowdown of the solar wind and the interstellar neutral hydrogen density. The theoretical predictions at the location of Voyager 2 were compared with the observations. For the purpose of this study, we focus on the statistical characteristics rather than detailed structures of the solar wind in the outer heliosphere. We found a decrease of similar to 40 km s(-1) or similar to 10% in the radial velocity near 60 AU. This speed decrease implies an interstellar neutral density of 0.05 cm(-3). C1 MIT, Ctr Space Res, Cambridge, MA 02139 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Wang, C (reprint author), MIT, Ctr Space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA. NR 16 TC 40 Z9 41 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD AUG 15 PY 2000 VL 27 IS 16 BP 2429 EP 2432 DI 10.1029/2000GL000058 PG 4 WC Geosciences, Multidisciplinary SC Geology GA 344QZ UT WOS:000088771500020 ER PT J AU McComas, DJ Gosling, JT Skoug, RM AF McComas, DJ Gosling, JT Skoug, RM TI Ulysses observations of the irregularly structured mid-latitude solar wind during the approach to solar maximum SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID CYCLE; STREAM; EVENTS; FLUX AB The Ulysses spacecraft reached 45 degrees S heliolatitude in its second polar orbit on 5 February 2000. Solar wind observations over the first portion of Ulysses' second orbit have been remarkably different from those taken at mid-latitudes throughout its first orbit. During these portions of its first orbit, Ulysses crossed back and forth between the fast and slow solar wind and encountered a persistent corotating interaction region (CIR) on each solar rotation. In contrast, as Ulysses climbed to mid-latitudes in its second orbit, it observed highly irregular solar wind with much less periodic CIRs, and no entries thus far into the fast solar wind. In addition, the recent data include a higher frequency of coronal mass ejections (CMEs) than observed in Ulysses' previous orbit, as well as numerous interplanetary shocks associated with both the CMEs and CIRs. These observations demonstrate that the mid-latitude solar wind structure becomes increasingly complex as solar activity increases and coronal streamers, small-scale coronal holes, and CMEs arise at increasingly high latitudes. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP McComas, DJ (reprint author), Univ Calif Los Alamos Natl Lab, D466, Los Alamos, NM 87545 USA. NR 16 TC 49 Z9 49 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD AUG 15 PY 2000 VL 27 IS 16 BP 2437 EP 2440 DI 10.1029/2000GL000052 PG 4 WC Geosciences, Multidisciplinary SC Geology GA 344QZ UT WOS:000088771500022 ER PT J AU Gary, SP Yin, L Winske, D AF Gary, SP Yin, L Winske, D TI Electromagnetic proton cyclotron anisotropy instability: Wave-particle scattering rate SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID TEMPERATURE ANISOTROPY; MAGNETOSHEATH; DEPLETION; MODEL; BETA AB The electromagnetic proton cyclotron instability is driven by a proton temperature anisotropy T-perpendicular to p/T-parallel to p > 1 where the directional subscripts denote directions relative to the background magnetic field. Enhanced field fluctuations from instability growth lead to wave-particle scattering which reduces the anisotropy; previous research has demonstrated that the anisotropy is constrained by a power-law function of beta(parallel to p). Here two-dimensional hybrid simulations in a homogeneous, magnetized, collisionless plasma are used to derive a scaling relation for the maximum scattering rate of proton anisotropy reduction. The result is a function only of the anisotropy and beta(parallel to p) and so is appropriate for use in fluid models of anisotropic plasmas such as the magnetosheath. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Gary, SP (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 14 TC 24 Z9 24 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD AUG 15 PY 2000 VL 27 IS 16 BP 2457 EP 2459 DI 10.1029/2000GL000055 PG 3 WC Geosciences, Multidisciplinary SC Geology GA 344QZ UT WOS:000088771500027 ER PT J AU Dilley, NR Bauer, ED Maple, MB Sales, BC AF Dilley, NR Bauer, ED Maple, MB Sales, BC TI Thermoelectric properties of chemically substituted skutterudites YbyCo4SnxSb12-x SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID LATTICE THERMAL-CONDUCTIVITY; FILLED SKUTTERUDITES; ANTIMONIDES; YBFE4SB12; LAFE4P12; COSB3 AB We report the results of a study of thermoelectric properties of chemically substituted quasiternary materials related to the recently discovered filled skutterudite compound YbFe4Sb12. The study explored partial filling at the Yb site as well as chemical doping with Sn at the Sb site in an attempt to optimize the thermoelectric figure of merit ZT in the system YbyCo4SnxSb12-x. Our measurements of these physical quantities from room temperature down to T=10 K indicate that, in our study, only the alloy Yb0.44Co4Sb12 possessed thermoelectric properties that are improved over the parent compound YbFe4Sb12, attaining a value of ZT=0.1 at T=300 K. (C) 2000 American Institute of Physics. [S0021- 8979(00)03116-9]. C1 Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA. Univ Calif San Diego, Inst Pure & Appl Phys Sci, La Jolla, CA 92093 USA. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. RP Maple, MB (reprint author), Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA. RI Bauer, Eric/D-7212-2011 NR 23 TC 78 Z9 79 U1 2 U2 21 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 AUG 15 PY 2000 VL 88 IS 4 BP 1948 EP 1951 AR PII [S0021-8979(00)03116-9] DI 10.1063/1.1305837 PG 4 WC Physics, Applied SC Physics GA 344WR UT WOS:000088783800039 ER PT J AU Jellinek, J Goldberg, A AF Jellinek, J Goldberg, A TI On the temperature, equipartition, degrees of freedom, and finite size effects: Application to aluminum clusters SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID AL ALLOY CLUSTERS; MICROCANONICAL ENSEMBLE; ROTATING CLUSTERS; ATOMIC CLUSTERS; DYNAMICS; SYSTEMS; FRAGMENTATION; POTENTIALS; TRANSITION; ENERGY AB The relationship between statistical ensembles (especially microcanonical ensemble) and dynamics, the equipartition theorem, and the notion of dynamical temperature are reexamined with an emphasis on finite size effects. A (dynamical) equipartition ansatz (postulate) is formulated and the notion of dynamical degrees of freedom is introduced. The utility of the dynamical degrees of freedom as an analysis tool is discussed and illustrated in applications to model aluminum clusters. (C) 2000 American Institute of Physics. [S0021-9606(00)50131-7]. C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Jellinek, J (reprint author), Argonne Natl Lab, Div Chem, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 27 TC 69 Z9 69 U1 0 U2 4 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 AUG 15 PY 2000 VL 113 IS 7 BP 2570 EP 2582 AR PII [S0021-9606(00)50131-7] DI 10.1063/1.1305821 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 344XY UT WOS:000088787400007 ER PT J AU Robertson, S Wagner, AF Wardlaw, DM AF Robertson, S Wagner, AF Wardlaw, DM TI Flexible transition state theory for a variable reaction coordinate: Derivation of canonical and microcanonical forms SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID RATE CONSTANTS; UNIMOLECULAR REACTIONS; DISSOCIATION; RECOMBINATION; FRAMEWORK; LOOSENESS; CH3+H; NO2 AB A completely general canonical and microcanonical (energy-resolved) flexible transition state theory (FTST) expression for the rate constant is derived for an arbitrary choice of reaction coordinate. The derivation is thorough and rigorous within the framework of FTST and replaces our previous treatments [Robertson , J. Chem. Phys. 103, 2917 (1995); Robertson , Faraday Discuss. Chem. Soc. 102, 65 (1995)] which implicitly involved some significant assumptions. The canonical rate expressions obtained here agree with our earlier results. The corresponding microcanonical results are new. The rate expressions apply to any definition of the separation distance between fragments in a barrierless recombination (or dissociation) that is held fixed during hindered rotations at the transition state, and to any combination of fragment structure (atom, linear top, nonlinear top). The minimization of the rate constant with respect to this definition can be regarded as optimizing the reaction coordinate within a canonical or microcanonical framework. The expression is analytic except for a configuration integral whose evaluation generally requires numerical integration over internal angles (from one to five depending on the fragment structures). The form of the integrand in this integral has important conceptual and computational implications. The primary component of the integrand is the determinant of the inverse G-matrix associated with the external rotations and the relative internal motion of the fragments. (C) 2000 American Institute of Physics. [S0021-9606(00)00531-6]. C1 Mol Simulat Inc, Cambridge CB5 8RE, England. Argonne Natl Lab, Argonne, IL 60439 USA. Queens Univ, Dept Chem, Kingston, ON K7L 3N6, Canada. RP Robertson, S (reprint author), Mol Simulat Inc, 230-250 Quorum,Barnwell Rd, Cambridge CB5 8RE, England. NR 31 TC 22 Z9 22 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 15 PY 2000 VL 113 IS 7 BP 2648 EP 2661 DI 10.1063/1.1305865 PG 14 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 344XY UT WOS:000088787400013 ER PT J AU Cannon, NA Boldyrev, AI Li, X Wang, LS AF Cannon, NA Boldyrev, AI Li, X Wang, LS TI The electronic structure and chemical bonding of aluminum acetylide: Al2C2 and Al2C2-: An experimental and theoretical investigation SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID COMBINED PHOTOELECTRON-SPECTROSCOPY; MOLECULAR-ORBITAL METHODS; GAUSSIAN-BASIS SETS; AB-INITIO; GREEN-FUNCTION; ANION; ATOMS; EXCHANGE; CARBON AB We have investigated the electronic structure and chemical bonding of Al2C2 and Al2C2- both experimentally and theoretically. Photoelectron spectra of Al2C2- were obtained at several photon energies. Two anionic isomers were observed: one with a very sharp ground state feature and a low vertical electron binding energy (0.71 eV) and another with a very broad ground state feature with a much higher vertical electron binding energy (1.58 eV). Theoretical calculations were performed at various levels of theory for both the anion and the neutral. We found two isomers with relatively close energies for the anion: a quasilinear acetylide species and a planar-bridged D-2h structure. However, only one stable isomer was found for the neutral, which has the acetylide structure. Adiabatic and vertical detachment energies were also calculated for the two anionic isomers and were used to interpret and assign the experimental spectra. We found that the sharp 0.71 eV feature was from the acetylide isomer, whereas the broad 1.58 eV feature was from the D-2h isomer. The excellent agreement between the calculated and experimental electron affinities and excitation energies lends considerable credence for the assignments of the two anionic isomers. The structures and bonding of the acetylide neutral and anion and the D-2h anion are discussed. (C) 2000 American Institute of Physics. [S0021-9606(00)30831-5]. C1 Utah State Univ, Dept Chem & Biochem, Logan, UT 84322 USA. Pacific NW Natl Lab, WR Wiley Environm Mol Sci Lab, Richland, WA 99352 USA. Washington State Univ, Dept Phys, Richland, WA USA. RP Cannon, NA (reprint author), Utah State Univ, Dept Chem & Biochem, Logan, UT 84322 USA. RI Boldyrev, Alexander/C-5940-2009 OI Boldyrev, Alexander/0000-0002-8277-3669 NR 33 TC 25 Z9 25 U1 0 U2 4 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 15 PY 2000 VL 113 IS 7 BP 2671 EP 2679 AR PII [S0021-9606(00)30831-5] DI 10.1063/1.1305881 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 344XY UT WOS:000088787400015 ER PT J AU Harkless, JAW Lester, WA AF Harkless, JAW Lester, WA TI Quantum Monte Carlo determination of the atomization energy and heat of formation of propargyl radical SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID EFFECTIVE POTENTIALS; WAVE-FUNCTIONS; BASIS-SETS; ATOMS; CHEMISTRY; H2CCCH; GAS AB The quantum Monte Carlo (QMC) method is used to compute the atomization energy and the heat of formation of the propargyl radical, C3H3. The effective core potential and fixed-node approximations are used in the diffusion Monte Carlo (DMC) variant of QMC. Two generalized gradient approximation density functionals, B3LYP and B3PW91, are also applied for comparison. The atomization energy determined by these methods is 606.12 kcal/mol (B3LYP), 610.24 kcal/mol (B3PW91), and 607.6(0.6) (DMC). The latter compares favorably with separate measurements of 608.0(3.0) and 608.5(1.2) kcal/mol. The Delta H-f(298) determined by these methods is 84.03 kcal/mol (B3LYP), 79.91 kcal/mol (B3PW91), 82.5(0.6) (DMC), and two independent measurements yield values of 82.5(3.0) and 81.5(1.2) kcal/mol. (C) 2000 American Institute of Physics. [S0021-9606(00)30231-8]. C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RP Harkless, JAW (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA. NR 32 TC 13 Z9 14 U1 1 U2 2 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 15 PY 2000 VL 113 IS 7 BP 2680 EP 2683 DI 10.1063/1.1305878 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 344XY UT WOS:000088787400016 ER PT J AU Yang, M Fleming, GR AF Yang, M Fleming, GR TI Third-order nonlinear optical response and energy transfer in static disordered systems SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID STIMULATED PHOTON-ECHO; PIGMENT-PROTEIN COMPLEXES; LIGHT-HARVESTING COMPLEX; SOLVATION DYNAMICS; RHODOBACTER-SPHAEROIDES; ANGSTROM RESOLUTION; CRYSTAL-STRUCTURE; SPECTROSCOPY; MYOGLOBIN; LH2 AB The signals generated by various third-order nonlinear spectroscopies (transient absorption, transient grating, and three-pulse photon echo peak shift) on energy transfer systems are investigated by carrying out model calculations. Focusing on the understanding of basic features, we employ a simple model system consisting of pairs of energy donors and acceptors. We assume that energy transfer occurs via the Forster mechanism (weak electronic coupling). Static disorder in the transition energies of the chromophores induces inhomogeneities in the rate of energy transfer and in the optical response. The interplay between these two processes is discussed. We show that the peak shift experiment has advantages over the other types of experiment in clarifying the nature of disorder which affects the mechanism and time scale of energy transfer. For example, the peak shift technique can reveal the extent to which disorder is correlated in individual chromophore assemblies, and the extent to which energy transfer can correlate the energies of donors and acceptors. Finally the ability of the peak shift method to distinguish and quantify diagonal and off-diagonal disorder in energy transfer systems is discussed. (C) 2000 American Institute of Physics. [S0021-9606(00)50931-3]. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Phys Biosci Div, Berkeley, CA 94720 USA. RP Yang, M (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. OI Yang, Mino/0000-0001-9504-0280 NR 49 TC 36 Z9 37 U1 0 U2 5 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 15 PY 2000 VL 113 IS 7 BP 2823 EP 2840 AR PII [S0021-9606(00)50931-3] DI 10.1063/1.1305886 PG 18 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 344XY UT WOS:000088787400031 ER PT J AU Striolo, A Prausnitz, JM AF Striolo, A Prausnitz, JM TI Osmotic second virial cross coefficients for star and linear polystyrenes SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MONTE-CARLO SIMULATION; DILUTE-SOLUTION; COMPUTER-SIMULATION; BRANCHED POLYMERS; THERMODYNAMICS; MIXTURES; COLLOIDS; SYSTEMS; CHAINS AB Experimental osmotic second virial cross coefficients are reported for linear and 8-arm star polystyrenes in three solvents: toluene, cyclohexane, and methylcyclohexane. The osmotic second virial cross coefficient for 8-arm star and linear polystyrene is always positive and within the osmotic second virial coefficients measured for the single polymers. The positive cross coefficient indicates net repulsion between the two different polymers in dilute solution. The extent of repulsion is greatest in toluene and least in cyclohexane. To relate the macroscopic second virial coefficient to microscopic interactions, the potential of mean force between linear and 6-arm star polymers was computed by molecular simulation. The interaction between nonbonded polymer segments is given by a square-well potential. Well width was set equal to one half of the segment diameter. Different solvent conditions were investigated by using different well depths. Potentials of mean force were then used to compute the osmotic second virial cross coefficients. (C) 2000 American Institute of Physics. [S0021-9606(00)51231-8]. C1 Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA. RP Prausnitz, JM (reprint author), Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA. RI Striolo, Alberto/G-2926-2011 NR 28 TC 7 Z9 7 U1 0 U2 4 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 15 PY 2000 VL 113 IS 7 BP 2927 EP 2931 DI 10.1063/1.1305888 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 344XY UT WOS:000088787400043 ER PT J AU Gschneidner, KA Pecharsky, VK AF Gschneidner, KA Pecharsky, VK TI The influence of magnetic field on the thermal properties of solids SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT Workshop on Enhanced Synthesis, Processing, and Properties of Materials with Electric and Magnetic Fields CY MAY 16-19, 1999 CL JOHNS ISL, SOUTH CAROLINA SP USA, Off Res DE magnetocaloric effect; lanthanide metals; lanthanide intermetallic compounds; ferromagnets; magnetic refrigeration ID ALLOYS; REFRIGERATION AB The response of a solid to an applied magnetic field can be determined several ways: by direct measurements and by calculating it from magnetization and from the heat capacities as functions of temperature and magnetic field. The magnetocaloric properties of various types of solids are reviewed: normal ferromagnets, materials with multiple magnetic transitions, materials which undergo a first-order transition, and superconductors. Recent developments indicate that the application of the magnetocaloric effect for air conditioning, refrigeration (including freezers), gas liquefaction, etc. is a viable technology. Environmental considerations are also discussed. (C) 2000 Elsevier Science S.A. All rights reserved. C1 Iowa State Univ, Ames Lab, Dept Mat Sci & Engn, Ames, IA 50011 USA. RP Gschneidner, KA (reprint author), Iowa State Univ, Ames Lab, Dept Mat Sci & Engn, Ames, IA 50011 USA. NR 24 TC 60 Z9 63 U1 4 U2 17 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD AUG 15 PY 2000 VL 287 IS 2 BP 301 EP 310 DI 10.1016/S0921-5093(00)00788-7 PG 10 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA 334EF UT WOS:000088172700023 ER PT J AU Lushnikov, PM AF Lushnikov, PM TI Dispersion-managed soliton in optical fibers with zero average dispersion SO OPTICS LETTERS LA English DT Article ID PULSE DYNAMICS; TRANSMISSION; COMMUNICATION; PROPAGATION AB A dispersion-managed optical system with stepwise periodic variation of dispersion is studied in the framework of a path-averaged Gabitov-Turitsyn equation. The soliton solution is obtained by means of iterating the path-averaged equation. The dependence of soliton parameters on dispersion map strength is investigated, together with the oscillating trills of the soliton; (C) 2000 Optical Society of America OCIS codes: 060.2330, 060.5530, 0330.4370, 190.5530, 260.2030. C1 Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. LD Landau Theoret Phys Inst, Moscow 117334, Russia. RP Lushnikov, PM (reprint author), Los Alamos Natl Lab, Div Theoret, MS-B284, Los Alamos, NM 87545 USA. EM lushnikov@cnls.lanl.gov RI Lushnikov, Pavel/I-2304-2013 NR 14 TC 38 Z9 38 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD AUG 15 PY 2000 VL 25 IS 16 BP 1144 EP 1146 DI 10.1364/OL.25.001144 PG 3 WC Optics SC Optics GA 343XH UT WOS:000088727400004 PM 18066148 ER PT J AU Kane, DJ Omenetto, FG Taylor, AJ AF Kane, DJ Omenetto, FG Taylor, AJ TI Convergence test for inversion of frequency-resolved optical gating spectrograms SO OPTICS LETTERS LA English DT Article ID ULTRASHORT LASER-PULSES; REAL-TIME MEASUREMENT; PHASE; AMPLITUDE; RETRIEVAL AB We describe a new and simple method to aid in the analysis of retrieved pulses from inverted frequency-resolved optical gating (FROG) traces. The analysis can separate noise from distortion and shows that distortion is more deleterious to the retrieved pulse than is pure noise. The analysis relies on the fact that FROG traces can be constructed from a single outer product of two vectors, whereas distortion and noise require the sum of a series of outer products. (C) 2000 Optical Society of America. OCIS codes: 100.3190, 100.5070, 320.5550, 320.7100. C1 SW Sci Inc, Santa Fe, NM 87505 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Kane, DJ (reprint author), SW Sci Inc, Suite E-11,1570 Pacheco St, Santa Fe, NM 87505 USA. NR 10 TC 7 Z9 7 U1 1 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD AUG 15 PY 2000 VL 25 IS 16 BP 1216 EP 1218 DI 10.1364/OL.25.001216 PG 3 WC Optics SC Optics GA 343XH UT WOS:000088727400029 PM 18066173 ER PT J AU Shrock, R AF Shrock, R TI Exact Potts model partition functions on ladder graphs SO PHYSICA A LA English DT Review ID GROUND-STATE ENTROPY; COMPLEX-TEMPERATURE PROPERTIES; CYCLIC STRIP GRAPHS; CHROMATIC POLYNOMIALS; SQUARE-LATTICE; FUNCTION ZEROS; ASYMPTOTIC LIMITS; ISING-MODEL; TRIANGULAR LATTICES; MAGNETIC-FIELD AB We present exact calculations of the partition function Z of the q-state Potts model and its generalization to real q, for arbitrary temperature on n-vertex ladder graphs, i.e., strips of the square lattice with width L-y = 2 and arbitrary length L-x, with free, cyclic, and Mobius longitudinal boundary conditions. These partition functions are equivalent to Tutte/Whitney polynomials for these graphs. The free energy is calculated exactly for the infinite-length limit of these ladder graphs and the thermodynamics is discussed. By comparison with strip graphs of other widths, we analyze how the singularities at the zero-temperature critical point of the ferromagnet on infinite-length, finite-width strips depend on the width. We point out and study the following noncommutativity at certain special values q(s): lim(n-->infinity) lim(q-->qs) Z(1/n) not equal lim(q-->qs) lim(n-->infinity) Z(1/n) It is shown that the Potts antiferromagnet on both the infinite-length line and ladder graphs with cyclic or Mobius boundary conditions exhibits a phase transition at finite temperature if 0 < q < 2, but with unphysical properties, including negative specific heat and non-existence, in the low-temperature phase, of an n --> infinity limit for thermodynamic functions that is independent of boundary conditions. Considering the full generalization to arbitrary complex q and temperature, we determine the singular locus B in the corresponding C-2 space, arising as the accumulation set of partition function zeros as n --> infinity, In particular, we study the connection with the T = 0 limit of the Potts antiferromagnet where B reduces to the accumulation set of chromatic zeros. Certain properties of the complex-temperature phase diagrams are shown to exhibit close connections with those of the model on the square lattice, showing that exact solutions on infinite-length strips provide a way of gaining insight into these complex-temperature phase diagrams. (C) 2000 Elsevier Science B.V. All rights reserved. C1 SUNY Stony Brook, CN Yang Inst Theoret Phys, Stony Brook, NY 11794 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Shrock, R (reprint author), SUNY Stony Brook, CN Yang Inst Theoret Phys, Stony Brook, NY 11794 USA. NR 105 TC 56 Z9 56 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD AUG 15 PY 2000 VL 283 IS 3-4 BP 388 EP 446 DI 10.1016/S0378-4371(00)00109-6 PG 59 WC Physics, Multidisciplinary SC Physics GA 338QN UT WOS:000088430900007 ER PT J AU Roder, J Bishop, AR Holian, BL Hammerberg, JE Mikulla, RP AF Roder, J Bishop, AR Holian, BL Hammerberg, JE Mikulla, RP TI Dry friction: modeling and energy flow SO PHYSICA D LA English DT Article DE friction; elastic medium; Frenkel-Kontorova model; viscous damping ID KONTOROVA-TOMLINSON MODEL; STICK-SLIP MOTION; DRIVEN; INTERFACES; DYNAMICS; SURFACES; ORIGIN; FILM AB A model of dry, wearless friction between two atomistically flat, two-dimensional workpieces is introduced. This isotropic elastic model allows us to study the how of energy away from the sliding interface during the frictional process. Although a direct quantitative comparison of the model with molecular dynamics data is not possible, qualitative comparisons indicate that much of the early-time nonplastic behavior of molecular dynamics data can be described by a simple elastic model. Also our results support previous speculation that it is appropriate to introduce viscous damping effects when formulating lower-dimensional models of such physical processes. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Appl Theoret & Computat Phys Div, Los Alamos, NM 87545 USA. RP Roder, J (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 24 TC 18 Z9 18 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD AUG 15 PY 2000 VL 142 IS 3-4 BP 306 EP 316 DI 10.1016/S0167-2789(00)00065-8 PG 11 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA 335JH UT WOS:000088240000006 ER PT J AU Shan, W Walukiewicz, W Yu, KM Ager, JW Haller, EE Geisz, JF Friedman, DJ Olson, JM Kurtz, SR Nauka, C AF Shan, W Walukiewicz, W Yu, KM Ager, JW Haller, EE Geisz, JF Friedman, DJ Olson, JM Kurtz, SR Nauka, C TI Effect of nitrogen on the electronic band structure of group III-N-V alloys SO PHYSICAL REVIEW B LA English DT Article ID GAINNAS ALLOYS; GAP ENERGY; GANXAS1-X; LUMINESCENCE; GAAS1-XNX; REDUCTION; GANAS; GAAS AB We have studied optical transitions at the Gamma and L points of the Brillouin zone of GaNxAs1-x and AlyGa1-yNxAs1-x alloys using photomodulation spectroscopy. For GaNxAs1-x with N contents between 0% and 2%, the N-induced shift of the conduction-band L minima is found to be only a fraction of the conduction-band edge shift at the Gamma point. The measurements of AlyGa1-yNxAs1-x further show that there is no correlation between the location of the X conduction-band minima and the observed E+ and E- transitions. The results demonstrate that the N-induced interactions between extended Gamma, L, and X conduction-band states do not play a significant role in modification of the conduction-band structure of III-N-V alloys. The N-induced change of the conduction-band structure is predominantly influenced by the anticrossing interaction between the extended states of the Gamma conduction band and the localized states of nitrogen. C1 Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Mat Sci & Mineral Engn, Berkeley, CA 94720 USA. Natl Renewable Energy Lab, Golden, CO 80401 USA. Hewlett Packard Labs, Palo Alto, CA 94304 USA. RP Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RI Yu, Kin Man/J-1399-2012; OI Yu, Kin Man/0000-0003-1350-9642; Ager, Joel/0000-0001-9334-9751 NR 23 TC 106 Z9 107 U1 1 U2 10 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 AUG 15 PY 2000 VL 62 IS 7 BP 4211 EP 4214 DI 10.1103/PhysRevB.62.4211 PG 4 WC Physics, Condensed Matter SC Physics GA 347JD UT WOS:000088924700008 ER PT J AU Munteanu, FM Kim, Y Perry, CH Heiman, D Rickel, DG Sundaram, M Gossard, AC AF Munteanu, FM Kim, Y Perry, CH Heiman, D Rickel, DG Sundaram, M Gossard, AC TI Polarization-dependent spectral redshifts at nu=1 and nu=2 in a GaAs quantum well in high magnetic fields up to 60 T SO PHYSICAL REVIEW B LA English DT Article ID 2-DIMENSIONAL ELECTRON-GAS; PHOTOLUMINESCENCE; RESONANCE; EMISSION; HALL AB Polarized magnetophotoluminescence measurements performed on a wide parabolic GaAs/Al0.2Ga0.8As quantum well reveal the presence of spectral redshifts in the energy at filling factors v = 1 and 2. The magnitude of these redshifts depends on the polarization and filling factor. While the values for the case of the a polarization agree with existing theories, the results for the sigma(+) polarizations are less understood. C1 Univ Calif Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA. Northeastern Univ, Dept Phys, Boston, MA 02115 USA. Univ Calif Santa Barbara, Dept Elect & Comp Engn, Santa Barbara, CA 93106 USA. RP Munteanu, FM (reprint author), Univ Calif Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA. NR 20 TC 2 Z9 2 U1 0 U2 0 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 AUG 15 PY 2000 VL 62 IS 7 BP 4249 EP 4252 DI 10.1103/PhysRevB.62.4249 PG 4 WC Physics, Condensed Matter SC Physics GA 347JD UT WOS:000088924700018 ER PT J AU Stojkovic, BP Yu, ZG Chernyshev, AL Bishop, AR Castro Neto, AH Gronbech-Jensen, N AF Stojkovic, BP Yu, ZG Chernyshev, AL Bishop, AR Castro Neto, AH Gronbech-Jensen, N TI Charge ordering and long-range interactions in layered transition metal oxides: A quasiclassical continuum study SO PHYSICAL REVIEW B LA English DT Article ID T-J MODEL; 2-DIMENSIONAL HUBBARD-MODEL; MAGNETIC PHASE-DIAGRAM; DOMAIN-WALLS; DOPED ANTIFERROMAGNETS; DENSITY WAVES; NORMAL-STATE; SEPARATION; STRIPES; SPIN AB The competition between long-range and short-range interactions among holes moving in an antiferromagnet (AF) is studied within a model derived from the spin-density-wave picture of layered transition metal oxides.A novel numerical approach is developed that allows one to solve the problem at finite hole densities in very large systems (of the order of hundreds of lattice spacings), albeit in a quasiclassical limit, and to correctly incorporate the long-range part of the Coulomb interaction. The focus is on the problem of charge ordering and the charge phase diagram: at low temperatures four different Phases are found, depending on the strength of the magnetic (dipolar) interaction generated by the spin-wave exchange and the density of holes. The four phases are the Wigner crystal, diagonal stripes, a grid phase (horizontal-vertical stripe loops), and a glassy-clumped phase. In the presence of both in-plane and out-of-plane charged impurities the stripe ordering is suppressed, although finite stripe segments persist. At finite temperatures multiscale (intermittency) dynamics is found, reminiscent of that in glasses. The dynamics of stripe melting and its implications for experiments is discussed. C1 Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. Iowa State Univ, Dept Chem, Ames, IA 50011 USA. Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA. Univ Calif Davis, Dept Appl Sci, Davis, CA 95616 USA. Lawrence Berkeley Lab, NERSC, Berkeley, CA 94720 USA. Russian Acad Sci, Inst Semicond Phys, Novosibirsk 630090, Russia. RP Stojkovic, BP (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RI Yu, Z/B-5547-2009; Castro Neto, Antonio/C-8363-2014; OI Castro Neto, Antonio/0000-0003-0613-4010; , Zhi-Gang/0000-0002-1376-9025 NR 69 TC 40 Z9 40 U1 3 U2 4 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 AUG 15 PY 2000 VL 62 IS 7 BP 4353 EP 4369 DI 10.1103/PhysRevB.62.4353 PG 17 WC Physics, Condensed Matter SC Physics GA 347JD UT WOS:000088924700031 ER PT J AU Zhang, Y Fluegel, B Mascarenhas, A Xin, HP Tu, CW AF Zhang, Y Fluegel, B Mascarenhas, A Xin, HP Tu, CW TI Optical transitions in the isoelectronically doped semiconductor GaP : N: An evolution from isolated centers, pairs, and clusters to an impurity band SO PHYSICAL REVIEW B LA English DT Article ID GAP1-XNX ALLOYS; NITROGEN CONCENTRATION; GAAS1-XNX ALLOYS; EXCITONS; GAASN; PHOTOLUMINESCENCE; LUMINESCENCE; LOCALIZATION; EXCITATIONS; DEPENDENCE AB In heavily nitrogen doped GaP, we show how isoelectronic doping results in an impurity band, and how this is manifested as a large band-gap reduction and an enhanced band-edge absorption. Heavily doped GaP:N or GaP1-xNx exhibits properties characteristic of both direct and indirect gap semiconductors. Exciton bound states associated with perturbed nitrogen pair centers and larger GaN clusters are observed. This paper indicates that to properly describe the properties of an impurity band, a hierarchy of impurity complexes needs to be considered. Our data also suggest that the excitonic effect plays a role in the impurity band formation and band-gap reduction. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. Univ Calif San Diego, Dept Elect & Comp Engn, La Jolla, CA 92093 USA. RP Zhang, Y (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. EM yzhang@nrel.gov NR 51 TC 87 Z9 92 U1 1 U2 9 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 AUG 15 PY 2000 VL 62 IS 7 BP 4493 EP 4500 DI 10.1103/PhysRevB.62.4493 PG 8 WC Physics, Condensed Matter SC Physics GA 347JD UT WOS:000088924700047 ER PT J AU Chvoj, Z Conrad, EH Tringides, MC AF Chvoj, Z Conrad, EH Tringides, MC TI Analysis of direct correlation measurements from adsorbed atom fluctuations SO PHYSICAL REVIEW B LA English DT Article ID SURFACE-DIFFUSION MEASUREMENTS AB Despite its importance in theoretical studies of surface diffusion there has been limited experimental progress in developing methods to measure the dynamic structure factor S(q,t). In this work we study gases adsorbed on single-crystal surfaces and show that their equilibrium dynamics is measurable in a diffraction experiment through density fluctuations described by the dynamic correlation function [S(q,t)S(q,0)]. Using a lattice-gas model with nearest-neighbor repulsive interaction, we demonstrate how to separate out the microscopic dynamics caused by diffusion and adsorption-desorption from the form of (S(q,t)S(q,0)). Our analytical results show that (S(q,t)S(q,0)) decays as an exponential with a time constant tau(cb) Significant deviations from the hydrodynamic dependence of 1/tau(q)= D(c)q(2) are found with and without desorption. These deviations have important consequences in extracting diffusion constants from experiments. C1 Acad Sci Czech Republ, Inst Phys, Prague 16253 6, Czech Republic. Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA. Iowa State Univ, Ames Lab, Dept Phys & Astron, Ames, IA 50011 USA. RP Chvoj, Z (reprint author), Acad Sci Czech Republ, Inst Phys, Cukrovarnicka 10, Prague 16253 6, Czech Republic. NR 21 TC 3 Z9 3 U1 0 U2 4 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 AUG 15 PY 2000 VL 62 IS 7 BP 4672 EP 4680 DI 10.1103/PhysRevB.62.4672 PG 9 WC Physics, Condensed Matter SC Physics GA 347JD UT WOS:000088924700070 ER PT J AU Rohlfing, M Louie, SG AF Rohlfing, M Louie, SG TI Electron-hole excitations and optical spectra from first principles SO PHYSICAL REVIEW B LA English DT Article ID AB-INITIO CALCULATION; DENSITY-FUNCTIONAL THEORY; INTERBAND CRITICAL-POINTS; PARTICLE BAND-STRUCTURE; SPACE-TIME METHOD; QUASI-PARTICLE; SELF-ENERGY; TEMPERATURE-DEPENDENCE; DIELECTRIC RESPONSE; SEMICONDUCTORS AB We present a recently developed approach to calculate electron-hole excitations and the optical spectra of condensed matter from first principles. The key concept is to describe the excitations of the electronic system by the corresponding one- and two-particle Green's function. The method combines three computational techniques. First, the electronic ground state is treated within density-functional theory. Second, the single particle spectrum of the electrons and holes is obtained within the GW approximation to the electron self-energy operator. Finally, the electron-hole interaction is calculated and a Bethe-Salpeter equation is solved, yielding the coupled electron-hole excitations. The resulting solutions allow the calculation of the entire optical spectrum. This holds both for bound excitonic states below the band gap, as well as for the resonant spectrum above the band gap. We discuss a number of technical developments needed for the application of the method to real systems. To illustrate the approach, we discuss the excitations and optical spectra of spatially isolated systems (atoms, molecules, and semiconductor clusters) and of extended, periodic crystals (semiconductors and insulators). C1 Univ Munster, Inst Theoret Phys Festkorperphys 2, D-48149 Munster, Germany. Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Sci Mat, Berkeley, CA 94720 USA. RP Rohlfing, M (reprint author), Univ Munster, Inst Theoret Phys Festkorperphys 2, Wilhelm Klemm Str 10, D-48149 Munster, Germany. NR 56 TC 618 Z9 620 U1 11 U2 84 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 AUG 15 PY 2000 VL 62 IS 8 BP 4927 EP 4944 DI 10.1103/PhysRevB.62.4927 PG 18 WC Physics, Condensed Matter SC Physics GA 348TU UT WOS:000089003200030 ER PT J AU Muino, RD Salin, A AF Muino, RD Salin, A TI Energy and angular momentum transfer in the excitation of electron-hole pairs by slow dimers SO PHYSICAL REVIEW B LA English DT Article ID DIATOMIC-MOLECULES; STOPPING POWER; METAL-SURFACES; GAS; SCATTERING; IONS; HYDROGEN; DENSITY AB We calculate the transfer of energy and angular momentum through electron-hole pair excitations for a slow dimer in an electron gas. We show that the Kohn-Sham procedure can be used under the adiabatic conditions that prevail in the shifted Fermi sphere approximation. We obtain the low-energy limit of the friction coefficient and average angular momentum transfer from a self-consistent calculation for the embedded dimer. We apply our theory to H-2 and LiH molecules. We use our results to evaluate the role of electron-hole pair excitations when a molecule approaches a metal surface. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Univ Bordeaux 1, CNRS, UMR 5803, Lab Physicochim Mol, F-33405 Talence, France. RP Muino, RD (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RI Diez Muino, Ricardo/C-9203-2009 OI Diez Muino, Ricardo/0000-0001-8593-0327 NR 27 TC 29 Z9 29 U1 0 U2 1 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 AUG 15 PY 2000 VL 62 IS 8 BP 5207 EP 5215 DI 10.1103/PhysRevB.62.5207 PG 9 WC Physics, Condensed Matter SC Physics GA 348TU UT WOS:000089003200064 ER PT J AU Catellani, A Galli, G Rigolli, PL AF Catellani, A Galli, G Rigolli, PL TI Carbon lines on the cubic SiC(001) surface SO PHYSICAL REVIEW B LA English DT Article ID SCANNING TUNNELING MICROSCOPE; FIRST-PRINCIPLES CALCULATIONS; BETA-SIC(100) SURFACE; RECONSTRUCTION; CLUSTERS AB We investigated the structure and bonding of carbon atomic lines on the beta-SiC(001) surface, using ab initio calculations. In agreement with experiment, we find that reconstructions with sp-bonded chains are energetically favored over those with sp(3)-like C bonds. However the energy difference between the two types of reconstructions is only a few meV/dimer, and for small applied compressive stress geometries with sp(3)-bonded sites become favored, in addition, the formation energy of sp(3)-like defects on a sp-bonded surface decreases rapidly with increasing defect concentration, pointing at stable sp(3) lines perpendicular to sp dimers, consistently with experiment. A mechanism is proposed for the recently observed sp --> sp(3) transition on carbon terminated beta-SiC(001) surfaces. C1 MASPEC, I-43010 Parma, Italy. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Dept Phys, I-43010 Parma, Italy. RP Catellani, A (reprint author), MASPEC, Parco Area Sci 37A, I-43010 Parma, Italy. NR 24 TC 31 Z9 31 U1 0 U2 1 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 AUG 15 PY 2000 VL 62 IS 8 BP R4794 EP R4797 DI 10.1103/PhysRevB.62.R4794 PG 4 WC Physics, Condensed Matter SC Physics GA 348TU UT WOS:000089003200007 ER PT J AU Garner, SR Hancock, JN Rodriguez, YW Schlesinger, Z Bucher, B Fisk, Z Sarrao, JL AF Garner, SR Hancock, JN Rodriguez, YW Schlesinger, Z Bucher, B Fisk, Z Sarrao, JL TI Optical study of the electronic phase transition of strongly correlated YbInCu4 SO PHYSICAL REVIEW B LA English DT Article ID ORDER VALENCE TRANSITION; CHARGE GAP; MODEL; YBIN1-XAGXCU4; CONDUCTIVITY; YBXIN1-XCU2; SYSTEMS AB Infrared, visible, and near-UV reflectivity measurements are used to obtain conductivity as a function of temperature and frequency in YbInCu4, which exhibits an isostructural phase-transition into a mixed-valent phase below T-upsilon similar or equal to 42 K. In addition to a gradual loss of spectral weight with decreasing temperature extending up to 1.5 eV, a sharp resonance appears at 0.25 eV in the mixed-valent phase. This feature can be described in terms of excitations into the Rondo (Abrikosov-Suhl) resonance, and, like the sudden reduction of resistivity, provides a direct reflection of the onset of coherence in this strongly correlated electron system. C1 Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA. ITR, Dept Phys, CH-8640 Rapperswil, Switzerland. Florida State Univ, Dept Phys, Talahassee, FL 32310 USA. Florida State Univ, NHMFL, Talahassee, FL 32310 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Garner, SR (reprint author), Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA. RI Hancock, Jason/F-4694-2010 NR 33 TC 28 Z9 28 U1 0 U2 4 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 AUG 15 PY 2000 VL 62 IS 8 BP R4778 EP R4781 DI 10.1103/PhysRevB.62.R4778 PG 4 WC Physics, Condensed Matter SC Physics GA 348TU UT WOS:000089003200003 ER PT J AU Mauri, F Pasquarello, A Pfrommer, BG Yoon, YG Louie, SG AF Mauri, F Pasquarello, A Pfrommer, BG Yoon, YG Louie, SG TI Si-O-Si bond-angle distribution in vitreous silica from first-principles Si-29 NMR analysis SO PHYSICAL REVIEW B LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; INITIO MOLECULAR-DYNAMICS; CHEMICAL-SHIFTS; ALUMINOSILICATE GLASSES; AMORPHOUS SIO2; SPECTROSCOPY; DIFFRACTION; POLYMORPHS; TRIDYMITE; TIME AB The correlation between Si-29 chemical shifts and Si-O-Si bond angles in SiO2 is determined within density-functional theory for the full range of angles present in vitreous silica. This relation closely reproduces measured shifts of crystalline polymorphs. The knowledge of the correlation allows us to reliably extract from the experimental NMR spectrum the mean (151 degrees) and the standard deviation (11 degrees) of the Si-O-Si angular distribution of vitreous silica. In particular, we show that the Mozzi-Warren Si-O-Si angular distribution is not consistent with the NMR data. This analysis illustrates the potential of our approach for structural determinations of silicate glasses. C1 Lab Mineral Cristallog Paris, F-75252 Paris, France. Inst Romand Rech Numer Phys Mat, IRRMA, CH-1015 Lausanne, Switzerland. PPH Ecublens, Ecole Polytech Fed Lausanne, CH-1015 Lausanne, Switzerland. Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Lab Mineral Cristallog Paris, Case 115,4 Pl Jussieu, F-75252 Paris, France. RI Yoon, Young-Gui/C-2978-2008; Pasquarello, Alfredo/G-2883-2011; mauri, francesco/K-5726-2012 OI Yoon, Young-Gui/0000-0002-1071-8628; mauri, francesco/0000-0002-6666-4710 NR 34 TC 107 Z9 108 U1 3 U2 14 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 AUG 15 PY 2000 VL 62 IS 8 BP R4786 EP R4789 DI 10.1103/PhysRevB.62.R4786 PG 4 WC Physics, Condensed Matter SC Physics GA 348TU UT WOS:000089003200005 ER PT J AU Cai, MJ Gaillard, MK AF Cai, MJ Gaillard, MK TI Remarks on "Inflation and flat directions in modular invariant superstring effective theories" SO PHYSICAL REVIEW D LA English DT Article AB The inflation model of Gaillard, Lyth and Murayama is reexamined, with a systematic scan of the parameter space for dilaton stabilization during inflation. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Theoret Phys Grp, Berkeley, CA 94720 USA. RP Cai, MJ (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. NR 5 TC 7 Z9 7 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 AUG 15 PY 2000 VL 62 IS 4 BP art. no. EP 047901 DI 10.1103/PhysRevD.62.047901 PG 3 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 345AK UT WOS:000088793100136 ER PT J AU Chamblin, A Csaki, C Erlich, J Hollowood, TJ AF Chamblin, A Csaki, C Erlich, J Hollowood, TJ TI Black diamonds at brane junctions SO PHYSICAL REVIEW D LA English DT Article AB We discuss the properties of black holes in brane-world scenarios where our Universe is viewed as a four-dimensional sub-manifold of some higher-dimensional spacetime. We consider in detail such a model where four-dimensional spacetime lies at the junction of several domain walls in a higher dimensional anti-de Sitter spacetime. In this model there may be any number p of infinitely large extra dimensions transverse to the brane-world. We present an exact solution describing a black p-brane which will induce on the brane-world the Schwarzschild solution. This exact solution is unstable to the Gregory-Laflamme instability, whereby long-wavelength perturbations cause the extended horizon to fragment. We therefore argue that at late times a non-rotating uncharged black hole in the brane-world is described by a deformed event horizon in p+4 dimensions which will induce, to good approximation, the Schwarzschild solution in the four-dimensional brane world. When p=2, this deformed horizon resembles a black diamond and more generally fur p>2, a polyhedron. C1 MIT, Ctr Theoret Phys, Cambridge, MA 02139 USA. Univ Calif Los Alamos Natl Lab, Div Theory T8, Los Alamos, NM 87545 USA. Univ Wales Swansea, Dept Phys, Swansea, W Glam, Wales. RP Chamblin, A (reprint author), MIT, Ctr Theoret Phys, MTP 6-304,77 Massachusetts Ave, Cambridge, MA 02139 USA. NR 24 TC 25 Z9 25 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 AUG 15 PY 2000 VL 62 IS 4 BP art. no. EP 044012 DI 10.1103/PhysRevD.62.044012 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 345AK UT WOS:000088793100054 ER PT J AU Chung, DJH Kolb, EW Riotto, A Tkachev, II AF Chung, DJH Kolb, EW Riotto, A Tkachev, II TI Probing Planckian physics: Resonant production of particles during inflation and features in the primordial power spectrum SO PHYSICAL REVIEW D LA English DT Article ID MICROWAVE BACKGROUND ANISOTROPIES; SUPERDUSTER-VOID NETWORK; LARGE-SCALE STRUCTURE; COLD DARK-MATTER; COSMOLOGICAL PERTURBATIONS; BARYONIC FEATURES; REDSHIFT SURVEYS; EARLY UNIVERSE; FLUCTUATIONS; PARAMETERS AB The phenomenon of the resonant production of particles after inflation has received much attention in the past few years. In a new application of the resonant production of particles, we consider the effect of a resonance hiring inflation. We show that if the inflaton is coupled to a massive particle, resonant production of the particle during inflation modifies the evolution of the inflaton, and may leave an imprint in the form of sharp features in the primordial power spectrum. Precision measurements of microwave background anisotropies and large-scale structure surveys could be sensitive to the features, and probe the spectrum of particles as massive as the Planck scale. C1 Univ Michigan, Randall Lab Phys, Ann Arbor, MI 48109 USA. Fermi Natl Accelerator Lab, NASA, Fermilab Astrophys Ctr, Batavia, IL 60510 USA. Univ Chicago, Enrico Fermi Inst, Dept Astron & Astrophys, Chicago, IL 60637 USA. CERN, Div Theory, CH-1211 Geneva 23, Switzerland. Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia. RP Chung, DJH (reprint author), Univ Michigan, Randall Lab Phys, Ann Arbor, MI 48109 USA. NR 54 TC 133 Z9 135 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 AUG 15 PY 2000 VL 62 IS 4 BP art. no. EP 043508 DI 10.1103/PhysRevD.62.043508 PG 13 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 345AK UT WOS:000088793100023 ER PT J AU Csaki, C Graesser, M Randall, L Terning, J AF Csaki, C Graesser, M Randall, L Terning, J TI Cosmology of brane models with radion stabilization SO PHYSICAL REVIEW D LA English DT Review ID LARGE INTERNAL DIMENSIONS; SUPERHEAVY DARK-MATTER; LARGE EXTRA DIMENSIONS; TEV-SCALE; SUBMILLIMETER DIMENSIONS; DOMAIN-WALLS; SPACE-TIME; INFLATION; UNIVERSE; SUPERGRAVITY AB We analyze the cosmology of the Randall-Sundrum model and that of compact brane models in general in the presence of a radius stabilization mechanism. We find that the expansion of our Universe is generically in agreement with the expected effective four dimensional description. The constraint (which is responsible for the appearance of nonconventional cosmologies in these models) that must be imposed on the matter densities on the two branes in the theory without a stabilized radius is a consequence of requiring a static solution even in the absence of stabilization. Such constraints disappear in the presence of a stablizing potential, and the ordinary Friedmann-Robertson-Walker (FRW) equations an reproduced, with the expansion driven by the sum of the physical values of the energy densities on the two branes and in the bulk. For the case of the Randall-Sundrum model we examine the kinematics of the radion field, and find that corrections to the standard FRW equations are small for temperatures below the weak scale. We find that the radion field has renormalizable and unsuppressed couplings to standard model particles after electroweak symmetry breaking. These couplings may have important implications for collider searches. We comment on the possibility that matter off the TeV brane could serve as a dark matter candidate. C1 Univ Calif Los Alamos Natl Lab, Theory Div T8, Los Alamos, NM 87545 USA. Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA. Princeton Univ, Dept Phys, Princeton, NJ 08544 USA. Univ Calif Santa Barbara, Inst Theoret Phys, Santa Barbara, CA 93106 USA. Harvard Univ, Dept Phys, Cambridge, MA 02138 USA. RP Csaki, C (reprint author), Univ Calif Los Alamos Natl Lab, Theory Div T8, POB 1663, Los Alamos, NM 87545 USA. NR 101 TC 381 Z9 380 U1 0 U2 2 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 AUG 15 PY 2000 VL 62 IS 4 BP art. no. EP 045015 DI 10.1103/PhysRevD.62.045015 PG 19 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 345AK UT WOS:000088793100107 ER PT J AU Jalilian-Marian, J Jeon, S Venugopalan, R Wirstam, J AF Jalilian-Marian, J Jeon, S Venugopalan, R Wirstam, J TI Minding one's P's and Q's: From the one loop effective action in quantum field theory to classical transport theory SO PHYSICAL REVIEW D LA English DT Review ID HARD THERMAL LOOPS; QUARK-GLUON PLASMA; HOT GAUGE-THEORIES; WILSON RENORMALIZATION-GROUP; MECHANICAL PATH-INTEGRALS; NON-ABELIAN PLASMAS; CHERN-SIMONS THEORY; LOW X PHYSICS; HIGH-TEMPERATURE; BOLTZMANN-EQUATION AB The one loop effective action in quantum field theory can be expressed as a quantum mechanical path integral over world lines, with internal symmetries represented by Grassmanian variables. In this paper, we develop a real time, many body, world line formalism for the one loop effective action. In particular, we study hot QCD and obtain the classical transport equations which, as Litim and Manuel have shown, reduce in the appropriate limit to the non-Abelian Boltzmann-Langevin equation first obtained by Bodeker. In the Vlasov limit, the classical kinetic equations are those that correspond to the hard thermal loop effective action. We also discuss the imaginary time world line formalism for a hot phi(4) theory, and elucidate its relation to classical transport theory. C1 Univ Arizona, Dept Phys, Tucson, AZ 85721 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Univ Stockholm, Inst Theoret Phys, S-11385 Stockholm, Sweden. RP Jalilian-Marian, J (reprint author), Univ Arizona, Dept Phys, Tucson, AZ 85721 USA. NR 103 TC 14 Z9 14 U1 0 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 AUG 15 PY 2000 VL 62 IS 4 BP art. no. EP 045020 DI 10.1103/PhysRevD.62.045020 PG 14 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 345AK UT WOS:000088793100112 ER PT J AU Kachru, S Schulz, M Silverstein, E AF Kachru, S Schulz, M Silverstein, E TI Self-tuning flat domain walls in 5D gravity and string theory SO PHYSICAL REVIEW D LA English DT Article ID COSMOLOGICAL CONSTANT; GAUGE DYNAMICS; DIMENSIONS; COMPACTIFICATION; SINGULARITIES; MILLIMETER; ORBIFOLDS; UNIVERSE; SPACE AB We present Poincare-invariant domain wall ("three-brane") solutions to some five-dimensional effective theories which can arise naturally in string theory. In particular, we find theories where Poincare-invariant solutions exist for arbitrary values of the brane tension, for certain restricted forms of the bulk interactions. We describe examples in string theory where it would be natural for the quantum corrections to the tension of the brane (arising from quantum fluctuations of modes with support on the brane) to maintain the required form of the action. In such cases, the Poincare-invariant solutions persist in the presence of these quantum corrections to the brane tension, so that no 4D cosmological constant is generated by these modes. C1 Stanford Univ, Dept Phys, Stanford, CA 94305 USA. Stanford Univ, SLAC, Stanford, CA 94305 USA. RP Kachru, S (reprint author), Stanford Univ, Dept Phys, Stanford, CA 94305 USA. NR 35 TC 271 Z9 272 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 AUG 15 PY 2000 VL 62 IS 4 BP art. no. EP 045021 DI 10.1103/PhysRevD.62.045021 PG 9 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 345AK UT WOS:000088793100113 ER PT J AU Bjoraker, J Hosotani, Y AF Bjoraker, J Hosotani, Y TI Monopoles, dyons, and black holes in the four-dimensional Einstein-Yang-Mills theory SO PHYSICAL REVIEW D LA English DT Article ID COSMOLOGICAL CONSTANT; GAUGE-THEORIES; INSTABILITY; EQUATIONS; SOLITONS; SPACE AB A continuum of monopole, dyon, and black hole solutions exists in the Einstein-Yang-Mills theory in asymptotically anti-de Sitter space. Their structure is studied in detail. The solutions are classified by non-Abelian electric and magnetic charges and the Arnowitt-Deser-Misner mass. The stability of the solutions which have no node in non-Abelian magnetic fields is established. There exist critical spacetime solutions which terminate at a finite radius, and have universal behavior. The moduli space of the solutions exhibits a fractal structure as the cosmological constant approaches zero. C1 Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA. RP Bjoraker, J (reprint author), Brookhaven Natl Lab, Bldg 510A, Upton, NY 11973 USA. NR 42 TC 66 Z9 66 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 AUG 15 PY 2000 VL 62 IS 4 AR 043513 DI 10.1103/PhysRevD.62.043513 PG 15 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 345AK UT WOS:000088793100028 ER PT J AU Waga, I Frieman, JA AF Waga, I Frieman, JA TI New constraints from high redshift supernovae and lensing statistics upon scalar field cosmologies SO PHYSICAL REVIEW D LA English DT Article ID STRING-DOMINATED UNIVERSE; GRAVITATIONAL LENSES; SCALING SOLUTIONS; COSMIC EQUATION; DARK ENERGY; CONSTANT; MODELS; LAMBDA; QUINTESSENCE; EVOLUTION AB We explore the implications of gravitationally lensed quasistellar objects and high-redshift SNe Ia observations for spatially hat cosmological models in which a classically evolving scalar field currently dominates the energy density of the Universe. We consider two representative scalar field potentials that give rise to effective decaying Lambda ("quintessence") models: pseudo Nambu-Goldstone bosons [V(phi) = M-4(1 + cos(phi/f))] and an inverse power-law potential [V(phi) = M(4+alpha)phi(-alpha)]. We show that a large region of parameter space is consistent with current data if Omega(m0)>0.15. On the other hand, a higher lower bound for the matter density parameter suggested by large-scale galaxy hows, Omega(m0)>0.3, considerably reduces the allowed parameter space, forcing the scalar field behavior to approach that of a cosmological constant. C1 Univ Fed Rio de Janeiro, Inst Fis, BR-21945970 Rio De Janeiro, Brazil. Fermi Natl Accelerator Lab, NASA, Fermilab Astrophys Ctr, Batavia, IL 60510 USA. Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA. RP Waga, I (reprint author), Univ Fed Rio de Janeiro, Inst Fis, BR-21945970 Rio De Janeiro, Brazil. RI Waga, Ioav/B-6288-2014 NR 88 TC 47 Z9 47 U1 0 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 AUG 15 PY 2000 VL 62 IS 4 AR 043521 DI 10.1103/PhysRevD.62.043521 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 345AK UT WOS:000088793100036 ER PT J AU Kim, CH Tinoco, I AF Kim, CH Tinoco, I TI A retroviral RNA kissing complex containing only two G center dot C base pairs SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID MURINE LEUKEMIA-VIRUS; MOMULV GENOMIC RNA; DIMER FORMATION; STEM-LOOP; DIMERIZATION; HAIRPIN; ENCAPSIDATION; INITIATION; TYPE-1; SEQUENCE AB The dimerization of viral RNA through noncovalent interactions at their 5' ends is a key step in the life cycle of retroviruses. In Moloney murine leukemia virus, three stem-loops are important in this process. One is a self-complementary tetraloop (H1), hut the other two stem-loops (HZ, H3) contain highly conserved GACG tetraloops that are not self-complementary sequences. Using two-dimensional NMR, we determined the structure of the H3 stem-loop. Surprisingly, it forms a stable, homodimeric kissing complex through only two intermolecular GC base pairs. Cross-strand interactions of the adenines adjacent to the intermolecular GC base pairs, plus unusual strong electrostatic interactions around the base pairs, contribute to the unexpected stability. This structure shows how even stem-loops without self-complementary sequences can facilitate the intermolecular recognition between two identical RNAs, and thus initiate dimerization and encapsidation of retroviral RNAs. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA. RP Tinoco, I (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. FU NIGMS NIH HHS [R37 GM010840, R01 GM010840, GM 10840] NR 31 TC 80 Z9 82 U1 0 U2 3 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD AUG 15 PY 2000 VL 97 IS 17 BP 9396 EP 9401 DI 10.1073/pnas.170283697 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 345XM UT WOS:000088840500013 PM 10931958 ER PT J AU Lacoste, TD Michalet, X Pinaud, F Chemla, DS Alivisatos, AP Weiss, S AF Lacoste, TD Michalet, X Pinaud, F Chemla, DS Alivisatos, AP Weiss, S TI Ultrahigh-resolution multicolor colocalization of single fluorescent probes SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID SCANNING OPTICAL MICROSCOPY; QUANTUM-DOT; NANOCRYSTALS; MOLECULES; SUPERRESOLUTION; DECONVOLUTION; SPECTROSCOPY; DIFFUSION; IMAGES; CELLS AB An optical ruler based on ultrahigh-resolution colocalization of single fluorescent probes is described in this paper. It relies on the use of two unique families of fluorophores, namely energy-transfer fluorescent beads (TransFluoSpheres) and semiconductor nanocrystal quantum dots, that can be excited by a single laser wavelength but emit at different wavelengths. A multicolor sample-scanning confocal microscope was constructed that allows one to image each fluorescent light emitter, free of chromatic aberrations, by scanning the sample with nanometer scale steps with a piezo-scanner. The resulting spots are accurately localized by fitting them to the known shape of the excitation point-spread function of the microscope. We present results of two-dimensional colocalization of TransFluoSpheres (40 nm in diameter) and of nanocrystals (3-10 nm in diameter) and demonstrate distance-measurement accuracy of better than 10 nm using conventional far-field optics. This ruler bridges the gap between fluorescence resonance energy transfer, near- and far-field imaging, spanning a range of a few nanometers to tens of micrometers. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA. RP Weiss, S (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, MS 2-300,1 Cyclotron Rd, Berkeley, CA 94720 USA. RI Pinaud, Fabien/F-2306-2010; weiss, shimon/B-4164-2009; Alivisatos , Paul /N-8863-2015; Michalet, Xavier/A-9704-2009 OI weiss, shimon/0000-0002-0720-5426; Alivisatos , Paul /0000-0001-6895-9048; Michalet, Xavier/0000-0001-6602-7693 NR 40 TC 249 Z9 258 U1 3 U2 38 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD AUG 15 PY 2000 VL 97 IS 17 BP 9461 EP 9466 DI 10.1073/pnas.170286097 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 345XM UT WOS:000088840500024 PM 10931959 ER PT J AU Rubin, SM Spence, MM Goodson, BM Wemmer, DE Pines, A AF Rubin, SM Spence, MM Goodson, BM Wemmer, DE Pines, A TI Evidence of nonspecific surface interactions between laser-polarized xenon and myoglobin in solution SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID ALPHA-CYCLODEXTRIN; CRYPTOPHANE-A; HUMAN BLOOD; XE-129 NMR; PROTEINS; ENHANCEMENT; RELAXATION; CAVITIES; ABSORPTION; BINDING AB The high sensitivity of the magnetic resonance properties of xenon to its local chemical environment and the large Xe-129 NMR signals attainable through optical pumping have motivated the use of xenon as a probe of macromolecular structure and dynamics. In the present work, we report evidence for nonspecific interactions between xenon and the exterior of myoglobin in aqueous solution, in addition to a previously reported internal binding interaction. Xe-129 chemical shift measurements in denatured myoglobin solutions and under native conditions with varying xenon concentrations confirm the presence of nonspecific interactions. Titration data are modeled quantitatively with treatment of the nonspecific interactions as weak binding sites. Using laser-polarized xenon to measure Xe-129 spin-lattice relaxation times (T-1), we observed a shorter T-1 in the presence of 1 mM denatured apomyoglobin in 6 M deuterated urea (T-1 = 59 +/- 1 s) compared with that in 6 M deuterated urea alone (T-1 = 291 +/- 2 s), suggesting that nonspecific xenon-protein interactions can enhance Xe-129 relaxation. An even shorter T1 was measured in ? mM apomyoglobin in D2O (T-1 = 15 +/- 0.3 s), compared with that in D2O alone (T-1 = 506 +/- 5 s). This difference in relaxation efficiency likely results from couplings between laser-polarized xenon and protons in the binding cavity of apomyoglobin that may permit the transfer of polarization between these nuclei via the nuclear Overhauser effect. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA. RP Pines, A (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. NR 35 TC 46 Z9 46 U1 4 U2 17 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD AUG 15 PY 2000 VL 97 IS 17 BP 9472 EP 9475 DI 10.1073/pnas.170278897 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 345XM UT WOS:000088840500026 PM 10931956 ER PT J AU Xu, Y Xu, D AF Xu, Y Xu, D TI Protein threading using PROSPECT: Design and evaluation SO PROTEINS-STRUCTURE FUNCTION AND GENETICS LA English DT Article DE protein threading; fold recognition; protein structure prediction; constrained threading; combinatorial optimization ID AMINO-ACID-SEQUENCES; 3-DIMENSIONAL STRUCTURE; PREDICTION; DATABASE; CLASSIFICATION; ALGORITHM; MODELS; FOLD AB The computer system PROSPECT for the protein fold recognition using the threading method is described and evaluated in this article. For a given target protein sequence and a template structure, PROSPECT guarantees to find a globally optimal threading alignment between the two, The scoring function for a threading alignment employed in PROSPECT consists of four additive terms: i) a mutation term, ii) a singleton fitness term, iii) a pairwise-contact potential term, and iv) alignment gap penalties, The current version of PROSPECT considers pair contacts only between core (alpha-helix or beta-strand) residues and alignment gaps only in loop regions, PROSPECT finds a globally optimal threading efficiently when pairwise contacts are considered only between residues that are spatially close (7 Angstrom or less between the C-beta atoms in the current implementation). On a test set consisting of 137 pairs of target-template proteins, each pair being from the same superfamily and having sequence identity less than or equal to 30%, PROSPECT recognizes 69% of the templates correctly and aligns 66% of the structurally alignable residues correctly. These numbers may be compared with the 55% fold recognition and 64% alignment accuracy for the same test set using only scoring terms i), ii), and (iv), indicating the significant contribution from the contact term, The fold recognition and alignment accuracy are further improved to 72% and 74%, respectively, when the secondary structure information predicted by the PHD program is used in scoring, PROSPECT also allows a user to incorporate constraints about a target protein, e.g., disulfide bonds, active sites, and NOE distance restraints, into the threading process. The system rigorously finds a globally optimal threading under the specified constraints. Test results have shown that the constraints can further improve the performance of PROSPECT, Proteins 2000;40:343-354. (C) 2000 Wiley-Liss, Inc. C1 Oak Ridge Natl Lab, Div Life Sci, Computat Biosci Sect, Oak Ridge, TN 37830 USA. RP Xu, Y (reprint author), Oak Ridge Natl Lab, Div Life Sci, Computat Biosci Sect, 1060 Commerce Pk Dr, Oak Ridge, TN 37830 USA. NR 27 TC 123 Z9 130 U1 0 U2 5 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC, 605 THIRD AVE, NEW YORK, NY 10158-0012 USA SN 0887-3585 J9 PROTEINS JI Proteins PD AUG 15 PY 2000 VL 40 IS 3 BP 343 EP 354 DI 10.1002/1097-0134(20000815)40:3<343::AID-PROT10>3.0.CO;2-S PG 12 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA 339XV UT WOS:000088503900001 PM 10861926 ER PT J AU Zhang, C Kim, SH AF Zhang, C Kim, SH TI A comprehensive analysis of the Greek key motifs in protein beta-barrels and beta-sandwiches SO PROTEINS-STRUCTURE FUNCTION AND GENETICS LA English DT Article DE protein folds; handedness of Greek key; twisted Greek key; common substructural unit of beta-sandwiches; folding and topology ID STRUCTURAL CLASSIFICATION; GLOBULAR-PROTEINS; FOLDING PATTERNS; PLEATED SHEETS; ALL-BETA; PRINCIPLES; CHYMOTRYPSIN; RECOGNITION; RESOLUTION; SECONDARY AB The Creek key motifs are the topological signature of many beta-barrels and a majority of beta-sandwich structures. An updated survey of these structures integrates many early observations and newly emerging patterns and provides a better understanding of the unique role of Creek keys in protein structures. A stereotypical Creek key beta-barrel accommodates five or six strands and can have 12 possible topologies, All except one six-stranded topologies have been observed, and only one five-stranded topologies have been seen in actual structures. Of the representative beta-barrel structures analyzed here, half have left-handed Creek keys, This result challenges the empirical claim of the handedness regularity of Creek keys in beta-barrels, One of the five-stranded topologies that has not been observed in beta-barrels comprises two overlapping Greek keys. The two three dimensional forms of this topology constitute a structural unit that is present in a vast majority of known beta-sandwich structures. Using this unit as the root, we have built a new taxonomy tree for the beta-sandwich folds and deduced a set of rules that appear to constrain how other beta-strands adjoin the unit to form a larger double-layered structure, These rules, though derived from a larger data set, are essentially the same as those drawn from earlier studies, suggesting that they may reflect the true topological constraints in the design of beta-sandwich structures. Finally, a novel variant of the Creek key motif (defined here as the twisted Greek key) has emerged which introduces loop crossings into the folded structures. Proteins 2000;40:409-419. (C) 2000 Wiley-Liss, Inc. C1 Univ Calif Berkeley, Dept Chem, Melvin Calvin Lab 220, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Kim, SH (reprint author), Univ Calif Berkeley, Dept Chem, Melvin Calvin Lab 220, Berkeley, CA 94720 USA. NR 44 TC 29 Z9 31 U1 1 U2 7 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC, 605 THIRD AVE, NEW YORK, NY 10158-0012 USA SN 0887-3585 J9 PROTEINS JI Proteins PD AUG 15 PY 2000 VL 40 IS 3 BP 409 EP 419 DI 10.1002/1097-0134(20000815)40:3<409::AID-PROT60>3.0.CO;2-6 PG 11 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA 339XV UT WOS:000088503900006 PM 10861931 ER PT J AU Lai, LH Yokota, H Hung, LW Kim, R Kim, SH AF Lai, LH Yokota, H Hung, LW Kim, R Kim, SH TI Crystal structure of archaeal RNase HII: a homologue of human major RNase H SO STRUCTURE WITH FOLDING & DESIGN LA English DT Article DE archaeal RNase H; DNA replication; removal of Okazaki fragment; RNase H ID COLI RIBONUCLEASE HI; SARCOMA VIRUS INTEGRASE; ELECTRON-DENSITY MAPS; ESCHERICHIA-COLI; MACROMOLECULAR STRUCTURES; REVERSE-TRANSCRIPTASE; CATALYTIC DOMAIN; RNHB GENE; DNA; IDENTIFICATION AB Background: RNases H are present in all organisms and cleave RNAs in RNA/DNA hybrids. There are two major types of RNases H that have little similarity in sequence, size and specificity. The structure of RNase HI, the smaller enzyme and most abundant in bacteria, has been extensively studied. However, no structural information is available for the larger RNase H, which is most abundant in eukaryotes and archaea. Mammalian RNase H participates in DNA replication, removal of the Okazaki fragments and possibly DNA repair. Results: The crystal structure of RNase HII from the hypothermophile Methanococcus jannaschii, which is homologous to mammalian RNase H, was solved using a multiwavelength anomalous dispersion (MAD) phasing method at 2 Angstrom resolution. The structure contains two compact domains. Despite the absence of sequence similarity, the large N-terminal domain shares a similar fold with the RNase HI of bacteria. The active site of RNase HII contains three aspartates: Asp7, Asp112 and Asp149. The nucleotide-binding site is located in the cleft between the N-terminal and C-terminal domains. Conclusions: Despite a lack of any detectable similarity in primary structure, RNase HII shares a similar structural domain with RNase HI, suggesting that the two classes of RNases H have a common catalytic mechanism and possibly a common evolutionary origin. The involvement of the unique C-terminal domain in substrate recognition explains the different reaction specificity observed between the two classes of RNase H. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Peking Univ, Coll Chem, Beijing 100871, Peoples R China. Peking Univ, Inst Chem Phys, Beijing 100871, Peoples R China. RP Kim, SH (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. NR 42 TC 56 Z9 58 U1 0 U2 4 PU CURRENT BIOLOGY LTD PI LONDON PA 84 THEOBALDS RD, LONDON WC1X 8RR, ENGLAND SN 0969-2126 J9 STRUCT FOLD DES JI Struct. Fold. Des. PD AUG 15 PY 2000 VL 8 IS 8 BP 897 EP 904 DI 10.1016/S0969-2126(00)00179-9 PG 8 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA 348CR UT WOS:000088967600011 PM 10997908 ER PT J AU Jiles, DC Lee, SJ Kenkel, J Metlov, KL AF Jiles, DC Lee, SJ Kenkel, J Metlov, KL TI Superparamagnetic magnetization equation in two dimensions SO APPLIED PHYSICS LETTERS LA English DT Article AB An equation for the dependence of magnetization on magnetic field in the case of two-dimensional (base plane) anisotropy has been derived. The resulting equation is expressed as an infinite series of modified Bessel functions, unlike the elementary function expressions that are applicable to the one-dimensional (axially anisotropic) and three-dimensional (isotropic) cases. Nevertheless, in the low-field limit, the series can be effectively truncated to give an approximate solution, while, in the high-field limit, an alternative expression has been derived which represents the limiting function as the field strength tends to infinity. The resulting expressions can be used to describe the superparamagnetic magnetization and susceptibility as a function of magnetic field in situations where the magnetic moments are constrained to lie in a plane, with no preferred direction within the plane. This can therefore be applied to two-dimensional structures, such as magnetic thin films, where magnetostatic energy confines the moments to the plane of the film, or to three-dimensional structures with planar magnetocrystalline anisotropy. (C) 2000 American Institute of Physics. [S0003-6951(00)01433-9]. C1 Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA. Acad Sci Czech Republ, Inst Phys, Dept Magnetism, CZ-18040 Prague, Czech Republic. RP Jiles, DC (reprint author), Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA. RI Jiles, David/H-9548-2012 NR 5 TC 14 Z9 14 U1 1 U2 5 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 14 PY 2000 VL 77 IS 7 BP 1029 EP 1031 DI 10.1063/1.1288677 PG 3 WC Physics, Applied SC Physics GA 344YE UT WOS:000088788000037 ER PT J AU Csaki, C Erlich, J Hollowood, TJ Shirman, Y AF Csaki, C Erlich, J Hollowood, TJ Shirman, Y TI Universal aspects of gravity localized on thick branes SO NUCLEAR PHYSICS B LA English DT Review ID EXTRA DIMENSION; DOMAIN-WALLS; BULK FIELDS; SPACE-TIME; SUPERGRAVITY AB We study gravity in backgrounds that are smooth generalizations of the Randall-Sundrum model, with and without scalar fields. These generalizations include three-branes in higher dimensional spaces which are not necessarily anti-de Sitter far from the branes, intersecting brane configurations and configurations involving negative tension branes, We show that under certain mild assumptions there is a universal equation for the gravitational fluctuations. We study both the graviton ground state and the continuum of Kaluza-Klein modes and we find that the four-dimensional gravitational mode is localized precisely when the effects of the continuum modes decouple at distances larger than the fundamental Planck scale. The decoupling is contingent only on the long-range behaviour of the metric from the brane and we find a universal form for the corrections to Newton's law. We also comment on th possible contribution of resonant modes. Given this, we find general classes of metrics which maintain localized four-dimensional gravity. We find that three-brane metrics in five dimensions can arise from a single scalar field source, and we rederive the BPS type conditions without any a priori assumptions regarding the form of the scalar potential. We also show that a single scaler field cannot produce conformally-flat locally intersecting brane configurations or a p-brane in greater than (p + 2)-dimensions. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, Theory Div T8, Los Alamos, NM 87545 USA. Univ Wales, Dept Phys, Swansea SA2 8PP, W Glam, Wales. Princeton Univ, Dept Phys, Princeton, NJ 08544 USA. NR 101 TC 326 Z9 327 U1 1 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 AUG 14 PY 2000 VL 581 IS 1-2 BP 309 EP 338 DI 10.1016/S0550-3213(00)00271-6 PG 30 WC Physics, Particles & Fields SC Physics GA 337EL UT WOS:000088344400015 ER PT J AU Affolder, T Akimoto, H Akopian, A Albrow, MG Amaral, P Amendolia, SR Amidei, D Anikeev, K Antos, J Apollinari, G Arisawa, T Asakawa, T Ashmanskas, W Atac, M Azfar, F Azzi-Bacchetta, P Bacchetta, N Bailey, MW Bailey, S de Barbaro, P Barbaro-Galtieri, A Barnes, VE Barnett, BA Barone, M Bauer, G Bedeschi, E Belforte, S Bellettini, G Bellinger, J Benjamin, D Bensinger, J Beretvas, A Berge, JP Berryhill, J Bevensee, B Bhatti, A Binkley, M Bisello, D Blair, RE Blocker, C Bloom, K Blumenfeld, B Blusk, SR Bocci, A Bodek, A Bokhari, W Bolla, G Bonushkin, Y Bortoletto, D Boudreau, J Brandl, A van den Brink, S Bromberg, C Brozovic, M Bruner, N Buckley-Geer, E Budagov, J Budd, HS Burkett, K Busetto, G Byon-Wagner, A Byrum, KL Campbell, M Carithers, W Carlson, J Carlsmith, D Cassada, J Castro, A Cauz, D Cerri, A Chan, AW Chang, PS Chang, PT Chapman, J Chen, C Chen, YC Cheng, MT Chertok, M Chiarelli, G Chirikov-Zorin, I Chlachidze, G Chlebana, F Christofek, L Chu, ML Cihangir, S Ciobanu, CI Clark, AG Connolly, A Conway, J Cooper, J Cordelli, M Cranshaw, J Cronin-Hennessy, D Cropp, R Culbertson, R Dagenhart, D DeJongh, F Dell'Agnello, S Dell'Orso, M Demina, R Demortier, L Deninno, M Derwent, PF Devlin, T Dittmann, JR Donati, S Done, J Dorigo, T Eddy, N Einsweiler, K Elias, JE Engels, E Erdmann, W Errede, D Errede, S Fan, Q Feild, RG Ferretti, C Field, RD Fiori, I Flaugher, B Foster, GW Franklin, M Freeman, J Friedman, J Fukui, Y Galeotti, S Gallinaro, M Gao, T Garcia-Sciveres, M Garfinkel, AF Gatti, P Gay, C Geer, S Gerdes, DW Giannetti, P Giromini, P Glagolev, V Gold, M Goldstein, J Gordon, A Goshaw, AT Gotra, Y Goulianos, K Green, C Groer, L Grosso-Pilcher, C Guenther, M Guillian, G da Costa, JG Guo, RS Haber, C Hafen, E Hahn, SR Hall, C Handa, T Handler, R Hao, W Happacher, F Hara, K Hardman, AD Harris, RM Hartmann, F Hatakeyama, K Hauser, J Heinrich, J Heiss, A Herndon, M Hinrichsen, B Hoffman, KD Holck, C Hollebeek, R Holloway, L Hughes, R Huston, J Huth, J Ikeda, H Incandela, J Introzzi, G Iwai, J Iwata, Y James, E Jensen, H Jones, M Joshi, U Kambara, H Kamon, T Kaneko, T Karr, K Kasha, H Kato, Y Keaffaber, TA Kelley, K Kelly, M Kennedy, RD Kephart, R Khazins, D Kikuchi, T Kirk, M Kim, BJ Kim, HS Kim, MJ Kim, SH Kim, YK Kirsch, L Klimenko, S Koehn, P Kongeter, A Kondo, K Konigsberg, J Kordas, K Korn, A Korytov, A Kovacs, E Kroll, J Kruse, M Kuhlmann, SE Kurino, K Kuwabara, T Laasanen, AT Lai, N Lami, S Lammel, S Lamoureux, JI Lancaster, M Latino, G LeCompte, T Lee, AM Leone, S Lewis, JD Lindgren, M Liss, TM Liu, JB Liu, YC Lockyer, N Loken, J Loreti, M Lucchesi, D Lukens, P Lusin, S Lyons, L Lys, J Madrak, R Maeshima, K Maksimovic, P Malferrari, L Mangano, M Mariotti, M Martignon, G Martin, A Matthews, JAJ Mayer, J Mazzanti, P McFarland, KS McIntyre, P McKigney, E Menguzzato, M Menzione, A Mesropian, C Miao, T Miller, R Miller, JS Minato, H Miscetti, S Mishina, M Mitselmakher, G Moggi, N Moore, E Moore, R Morita, Y Mukherjee, A Muller, T Munar, A Murat, P Murgia, S Musy, M Nachtman, J Nahn, S Nakada, H Nakaya, T Nakano, I Nelson, C Neuberger, D Newman-Holmes, C Ngan, CYP Nicolaidi, P Niu, H Nodulman, L Nomerotski, A Oh, SH Ohmoto, T Ohsugi, T Oishi, R Okusawa, T Olsen, J Pagliarone, C Palmonari, F Paoletti, R Papadimitriou, V Pappas, SP Partos, D Patrick, J Pauletta, G Paulini, M Paus, C Pescara, L Phillips, TJ Piacentino, G Pitts, KT Plunkett, R Pompos, A Pondrom, L Pope, G Popovic, M Prokoshin, F Proudfoot, J Ptohos, F Punzi, G Ragan, K Rakitine, A Reher, D Reichold, A Riegler, W Ribon, A Rimondi, F Ristori, L Robertson, WJ Robinson, A Rodrigo, T Rolli, S Rosenson, L Roser, R Rossin, R Sakumoto, WK Saltzberg, D Sansoni, A Santi, L Sato, H Savard, P Schlabach, P Schmidt, EE Schmidt, MP Schmitt, M Scodellaro, L Scott, A Scribano, A Segler, S Seidel, S Seiya, Y Semenov, A Semeria, F Shah, T Shapiro, MD Shepard, PF Shibayama, T Shimojima, M Shochet, M Siegrist, J Signorelli, G Sill, A Sinervo, P Singh, P Slaughter, AJ Sliwa, K Smith, C Snider, FD Solodsky, A Spalding, J Speer, T Sphicas, P Spinella, F Spiropulu, M Spiegel, L Steele, J Stefanini, A Strologas, J Strumia, F Stuart, D Sumorok, K Suzuki, T Takano, T Takashima, R Takikawa, K Tamburello, P Tanaka, M Tannenbaum, B Taylor, W Tecchio, M Teng, PK Terashi, K Tether, S Theriot, D Thurman-Keup, R Tipton, P Tkaczyk, S Tollefson, K Tollestrup, A Toyoda, H Trischuk, W de Troconiz, JF Tseng, J Turini, N Ukegawa, F Vaiciulis, T Valls, J Vejcik, S Velev, G Vidal, R Vilar, R Volobouev, I Vucinic, D Wagner, RG Wagner, RL Wahl, J Wallace, NB Walsh, AM Wang, C Wang, CH Wang, MJ Watanabe, T Waters, D Watts, T Webb, R Wenzel, H Wester, WC Wicklund, AB Wicklund, E Williams, HH Wilson, P Winer, BL Winn, D Wolbers, S Wolinski, D Wolinski, J Wolinski, S Worm, S Wu, X Wyss, J Yagil, A Yao, W Yeh, GP Yeh, P Yoh, J Yosef, C Yoshida, T Yu, I Yu, S Zanetti, A Zetti, F Zucchelli, S AF Affolder, T Akimoto, H Akopian, A Albrow, MG Amaral, P Amendolia, SR Amidei, D Anikeev, K Antos, J Apollinari, G Arisawa, T Asakawa, T Ashmanskas, W Atac, M Azfar, F Azzi-Bacchetta, P Bacchetta, N Bailey, MW Bailey, S de Barbaro, P Barbaro-Galtieri, A Barnes, VE Barnett, BA Barone, M Bauer, G Bedeschi, E Belforte, S Bellettini, G Bellinger, J Benjamin, D Bensinger, J Beretvas, A Berge, JP Berryhill, J Bevensee, B Bhatti, A Binkley, M Bisello, D Blair, RE Blocker, C Bloom, K Blumenfeld, B Blusk, SR Bocci, A Bodek, A Bokhari, W Bolla, G Bonushkin, Y Bortoletto, D Boudreau, J Brandl, A van den Brink, S Bromberg, C Brozovic, M Bruner, N Buckley-Geer, E Budagov, J Budd, HS Burkett, K Busetto, G Byon-Wagner, A Byrum, KL Campbell, M Carithers, W Carlson, J Carlsmith, D Cassada, J Castro, A Cauz, D Cerri, A Chan, AW Chang, PS Chang, PT Chapman, J Chen, C Chen, YC Cheng, MT Chertok, M Chiarelli, G Chirikov-Zorin, I Chlachidze, G Chlebana, F Christofek, L Chu, ML Cihangir, S Ciobanu, CI Clark, AG Connolly, A Conway, J Cooper, J Cordelli, M Cranshaw, J Cronin-Hennessy, D Cropp, R Culbertson, R Dagenhart, D DeJongh, F Dell'Agnello, S Dell'Orso, M Demina, R Demortier, L Deninno, M Derwent, PF Devlin, T Dittmann, JR Donati, S Done, J Dorigo, T Eddy, N Einsweiler, K Elias, JE Engels, E Erdmann, W Errede, D Errede, S Fan, Q Feild, RG Ferretti, C Field, RD Fiori, I Flaugher, B Foster, GW Franklin, M Freeman, J Friedman, J Fukui, Y Galeotti, S Gallinaro, M Gao, T Garcia-Sciveres, M Garfinkel, AF Gatti, P Gay, C Geer, S Gerdes, DW Giannetti, P Giromini, P Glagolev, V Gold, M Goldstein, J Gordon, A Goshaw, AT Gotra, Y Goulianos, K Green, C Groer, L Grosso-Pilcher, C Guenther, M Guillian, G da Costa, JG Guo, RS Haber, C Hafen, E Hahn, SR Hall, C Handa, T Handler, R Hao, W Happacher, F Hara, K Hardman, AD Harris, RM Hartmann, F Hatakeyama, K Hauser, J Heinrich, J Heiss, A Herndon, M Hinrichsen, B Hoffman, KD Holck, C Hollebeek, R Holloway, L Hughes, R Huston, J Huth, J Ikeda, H Incandela, J Introzzi, G Iwai, J Iwata, Y James, E Jensen, H Jones, M Joshi, U Kambara, H Kamon, T Kaneko, T Karr, K Kasha, H Kato, Y Keaffaber, TA Kelley, K Kelly, M Kennedy, RD Kephart, R Khazins, D Kikuchi, T Kirk, M Kim, BJ Kim, HS Kim, MJ Kim, SH Kim, YK Kirsch, L Klimenko, S Koehn, P Kongeter, A Kondo, K Konigsberg, J Kordas, K Korn, A Korytov, A Kovacs, E Kroll, J Kruse, M Kuhlmann, SE Kurino, K Kuwabara, T Laasanen, AT Lai, N Lami, S Lammel, S Lamoureux, JI Lancaster, M Latino, G LeCompte, T Lee, AM Leone, S Lewis, JD Lindgren, M Liss, TM Liu, JB Liu, YC Lockyer, N Loken, J Loreti, M Lucchesi, D Lukens, P Lusin, S Lyons, L Lys, J Madrak, R Maeshima, K Maksimovic, P Malferrari, L Mangano, M Mariotti, M Martignon, G Martin, A Matthews, JAJ Mayer, J Mazzanti, P McFarland, KS McIntyre, P McKigney, E Menguzzato, M Menzione, A Mesropian, C Miao, T Miller, R Miller, JS Minato, H Miscetti, S Mishina, M Mitselmakher, G Moggi, N Moore, E Moore, R Morita, Y Mukherjee, A Muller, T Munar, A Murat, P Murgia, S Musy, M Nachtman, J Nahn, S Nakada, H Nakaya, T Nakano, I Nelson, C Neuberger, D Newman-Holmes, C Ngan, CYP Nicolaidi, P Niu, H Nodulman, L Nomerotski, A Oh, SH Ohmoto, T Ohsugi, T Oishi, R Okusawa, T Olsen, J Pagliarone, C Palmonari, F Paoletti, R Papadimitriou, V Pappas, SP Partos, D Patrick, J Pauletta, G Paulini, M Paus, C Pescara, L Phillips, TJ Piacentino, G Pitts, KT Plunkett, R Pompos, A Pondrom, L Pope, G Popovic, M Prokoshin, F Proudfoot, J Ptohos, F Punzi, G Ragan, K Rakitine, A Reher, D Reichold, A Riegler, W Ribon, A Rimondi, F Ristori, L Robertson, WJ Robinson, A Rodrigo, T Rolli, S Rosenson, L Roser, R Rossin, R Sakumoto, WK Saltzberg, D Sansoni, A Santi, L Sato, H Savard, P Schlabach, P Schmidt, EE Schmidt, MP Schmitt, M Scodellaro, L Scott, A Scribano, A Segler, S Seidel, S Seiya, Y Semenov, A Semeria, F Shah, T Shapiro, MD Shepard, PF Shibayama, T Shimojima, M Shochet, M Siegrist, J Signorelli, G Sill, A Sinervo, P Singh, P Slaughter, AJ Sliwa, K Smith, C Snider, FD Solodsky, A Spalding, J Speer, T Sphicas, P Spinella, F Spiropulu, M Spiegel, L Steele, J Stefanini, A Strologas, J Strumia, F Stuart, D Sumorok, K Suzuki, T Takano, T Takashima, R Takikawa, K Tamburello, P Tanaka, M Tannenbaum, B Taylor, W Tecchio, M Teng, PK Terashi, K Tether, S Theriot, D Thurman-Keup, R Tipton, P Tkaczyk, S Tollefson, K Tollestrup, A Toyoda, H Trischuk, W de Troconiz, JF Tseng, J Turini, N Ukegawa, F Vaiciulis, T Valls, J Vejcik, S Velev, G Vidal, R Vilar, R Volobouev, I Vucinic, D Wagner, RG Wagner, RL Wahl, J Wallace, NB Walsh, AM Wang, C Wang, CH Wang, MJ Watanabe, T Waters, D Watts, T Webb, R Wenzel, H Wester, WC Wicklund, AB Wicklund, E Williams, HH Wilson, P Winer, BL Winn, D Wolbers, S Wolinski, D Wolinski, J Wolinski, S Worm, S Wu, X Wyss, J Yagil, A Yao, W Yeh, GP Yeh, P Yoh, J Yosef, C Yoshida, T Yu, I Yu, S Zanetti, A Zetti, F Zucchelli, S TI Limits on light gravitino production and new processes with large missing transverse energy in p(p)over-bar collisions at root s=1.8 TeV SO PHYSICAL REVIEW LETTERS LA English DT Article ID TOP-QUARK PRODUCTION; ALPHA-S CALCULATION; HADRONIC COLLISIONS; CROSS-SECTION; (P)OVER-BAR-P COLLISIONS; PARTON DISTRIBUTIONS; 1.8 TEV; PHYSICS; SUPERSYMMETRY; SUPERGRAVITY AB Events collected by the Collider Detector at Fermilab (CDF) with an energetic jet plus large missing transverse energy can be used to search for physics beyond the standard model. We see no deviations from the expected backgrounds and set upper limits on the production of new processes. We consider in addition the production of light gravitinos and set a limit at 95% confidence level on the breaking scale root F greater than or equal to 217 GeV, which excludes gravitino masses smaller than 1.1 X 10(-5) eV/c(2). C1 Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Acad Sinica, Inst Phys, Taipei 11529, Taiwan. Argonne Natl Lab, Argonne, IL 60439 USA. Univ Bologna, Ist Nazl Fis Nucl, I-40127 Bologna, Italy. Brandeis Univ, Waltham, MA 02254 USA. Univ Calif Los Angeles, Los Angeles, CA 90024 USA. Univ Cantabria, Inst Fis Cantabria, E-39005 Santander, Spain. Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA. Joint Nucl Res Inst, RU-141980 Dubna, Russia. Duke Univ, Durham, NC 27708 USA. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Florida, Gainesville, FL 32611 USA. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Geneva, CH-1211 Geneva 4, Switzerland. Harvard Univ, Cambridge, MA 02138 USA. Hiroshima Univ, Higashihiroshima 724, Japan. Univ Illinois, Urbana, IL 61801 USA. Johns Hopkins Univ, Baltimore, MD 21218 USA. Univ Karlsruhe, Inst Expt Kernphys, D-76128 Karlsruhe, Germany. Kyungpook Natl Univ, Korean Hadron Collider Lab, Taegu 702701, South Korea. Seoul Natl Univ, Seoul 151742, South Korea. Sungkyunkwan Univ, Suwon 440746, South Korea. High Energy Accelerator Res Org, KEK, Tsukuba, Ibaraki 305, Japan. MIT, Cambridge, MA 02139 USA. McGill Univ, Inst Particle Phys, Montreal, PQ H3A 2T8, Canada. Univ Toronto, Toronto, ON M5S 1A7, Canada. Univ Michigan, Ann Arbor, MI 48109 USA. Michigan State Univ, E Lansing, MI 48824 USA. Univ New Mexico, Albuquerque, NM 87131 USA. Ohio State Univ, Columbus, OH 43210 USA. Osaka City Univ, Osaka 588, Japan. Univ Oxford, Oxford OX1 3RH, England. Univ Padua, Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy. Univ Penn, Philadelphia, PA 19104 USA. Univ Pisa, Ist Nazl Fis Nucl, I-56100 Pisa, Italy. Scuola Normale Super Pisa, I-56100 Pisa, Italy. Univ Pittsburgh, Pittsburgh, PA 15260 USA. Purdue Univ, W Lafayette, IN 47907 USA. Univ Rochester, Rochester, NY 14627 USA. Rockefeller Univ, New York, NY 10021 USA. Rutgers State Univ, Piscataway, NJ 08855 USA. Texas A&M Univ, College Stn, TX 77843 USA. Texas Tech Univ, Lubbock, TX 79409 USA. Univ Trieste, Ist Nazl Fis Nucl, Udine, Italy. Univ Tsukuba, Tsukuba, Ibaraki 305, Japan. Tufts Univ, Medford, MA 02155 USA. Waseda Univ, Tokyo 169, Japan. Univ Wisconsin, Madison, WI 53706 USA. Yale Univ, New Haven, CT 06520 USA. RP Affolder, T (reprint author), Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RI Lancaster, Mark/C-1693-2008; Vucinic, Dejan/C-2406-2008; Nomerotski, Andrei/A-5169-2010; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Chiarelli, Giorgio/E-8953-2012; Scodellaro, Luca/K-9091-2014; Paulini, Manfred/N-7794-2014; Prokoshin, Fedor/E-2795-2012; Introzzi, Gianluca/K-2497-2015 OI Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Chiarelli, Giorgio/0000-0001-9851-4816; Scodellaro, Luca/0000-0002-4974-8330; Paulini, Manfred/0000-0002-6714-5787; Prokoshin, Fedor/0000-0001-6389-5399; Introzzi, Gianluca/0000-0002-1314-2580 NR 29 TC 18 Z9 18 U1 0 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 AUG 14 PY 2000 VL 85 IS 7 BP 1378 EP 1383 DI 10.1103/PhysRevLett.85.1378 PG 6 WC Physics, Multidisciplinary SC Physics GA 344ER UT WOS:000088745100008 ER PT J AU Budde, M Lupke, G Cheney, CP Tolk, NH Feldman, LC AF Budde, M Lupke, G Cheney, CP Tolk, NH Feldman, LC TI Vibrational lifetime of bond-center hydrogen in crystalline silicon SO PHYSICAL REVIEW LETTERS LA English DT Article ID ADSORBATE-SUBSTRATE VIBRATION; VACANCY DEFECTS; DENSE MEDIUM; RELAXATION; MOLECULE; SI(111); MODES AB The lifetime of the stretch mode of bond-center hydrogen in crystalline silicon is measured to be T-1 = 7.8 +/- 0.2 ps with time-resolved, transient bleaching spectroscopy. The low-temperature spectral width of the absorption line due to the stretch mode converges towards its natural width for decreasing hydrogen concentration C-H, and nearly coincides with the natural width for C-H similar to 1 ppm. The lifetimes of the Si-H stretch modes of selected hydrogen-related defects are estimated from their spectral widths and shown to range from 1.6 to more than 37 ps. C1 Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA. Coll William & Mary, Dept Appl Sci, Williamsburg, VA 23187 USA. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. RP Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA. NR 26 TC 80 Z9 80 U1 0 U2 7 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 AUG 14 PY 2000 VL 85 IS 7 BP 1452 EP 1455 DI 10.1103/PhysRevLett.85.1452 PG 4 WC Physics, Multidisciplinary SC Physics GA 344ER UT WOS:000088745100026 ER PT J AU Roos, KR Tringides, MC AF Roos, KR Tringides, MC TI Determination of interlayer diffusion parameters for Ag/Ag(111) SO PHYSICAL REVIEW LETTERS LA English DT Article ID BY-LAYER GROWTH; STEP-EDGE BARRIER; MASS-TRANSPORT; AG(111); AG AB It is well known that the Ag/Ag(lll) epitaxial system grows three dimensionally because of the existence of a relatively high excess diffusion barrier, Delta E-s = 0.13 eV, at the step edges. Several experimental methods have been developed to measure the step edge barrier in this system over a wide coverage range. The probability for an atom to move from a higher to a lower layer depends on both the barrier and the prefactor, so it is important to lest whether the prefactors for hopping over a step, v(s), and for hopping on a terrace, v(t), are different. We present the results from several experiments on Ag/Ag(lll) to conclude that v(s)/v(t) = 10(2.0+/-0.3). C1 Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. Bradley Univ, Dept Phys, Peoria, IL 61625 USA. RP Iowa State Univ, Ames Lab, Ames, IA 50011 USA. EM tringides@ameslab.gov NR 14 TC 27 Z9 27 U1 1 U2 3 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 AUG 14 PY 2000 VL 85 IS 7 BP 1480 EP 1483 DI 10.1103/PhysRevLett.85.1480 PG 4 WC Physics, Multidisciplinary SC Physics GA 344ER UT WOS:000088745100033 ER PT J AU Qiu, SR Lai, HF Yarmoff, JA AF Qiu, SR Lai, HF Yarmoff, JA TI Self-limiting growth of metal fluoride thin films by oxidation reactions employing molecular precursors SO PHYSICAL REVIEW LETTERS LA English DT Article ID X-RAY PHOTOEMISSION; SPECTRA; SI(111) AB FeF2 films are grown by the reaction of XeF2 and SeF6 with iron foil. The growth initially follows the Mott-Cabrera parabolic rate law, indicating that the process is diffusion limited. At a certain film thickness, however, the growth abruptly stops, with the thickness using XeF2 being nearly double that with SeF6. It is suggested that the shutdown is due to the inability of the molecules to dissociate when too far from the substrate and that SeF6 must approach more closely than XeF2. This work suggests the use of molecular precursors to grow thin films via a self-limiting chemical process. C1 Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA. Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Yarmoff, JA (reprint author), Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA. NR 28 TC 19 Z9 20 U1 2 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 AUG 14 PY 2000 VL 85 IS 7 BP 1492 EP 1495 DI 10.1103/PhysRevLett.85.1492 PG 4 WC Physics, Multidisciplinary SC Physics GA 344ER UT WOS:000088745100036 ER PT J AU Miller, RI Kiefl, RF Brewer, JH Chakhalian, J Dunsiger, S Morris, GD Sonier, JE MacFarlane, WA AF Miller, RI Kiefl, RF Brewer, JH Chakhalian, J Dunsiger, S Morris, GD Sonier, JE MacFarlane, WA TI Low temperature limit of the vortex core radius and the Kramer-Pesch effect in NbSe2 SO PHYSICAL REVIEW LETTERS LA English DT Article ID MAGNETIC PENETRATION DEPTH; S-WAVE SUPERCONDUCTORS; FIELD-DEPENDENCE AB Muon spin rotation (mu SR) has been used to measure the magnetic field distribution in the vortex state of the type-II superconductor NbSe2 (T-c = 7.0 K) below T = 2 K. The distribution is consistent with a highly ordered hexagonal vortex lattice with a well resolved high-field cutoff associated with the finite size of the vortex cores. The temperature dependence of the core radius is much weaker than the temperature dependence predicted from the Bogoliubov-de Gennes theory. Furthermore, the vortex radius measured by mu SR near the low temperature quantum limit is about an order of magnitude larger than predicted. C1 TRIUMF, Vancouver, BC V6T 2A3, Canada. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada. RP Miller, RI (reprint author), TRIUMF, 4004 WEstbrook Mall, Vancouver, BC V6T 2A3, Canada. RI Chakhalian, Jak/F-2274-2015; OI Brewer, Jesse H./0000-0002-8211-1235 NR 13 TC 23 Z9 23 U1 0 U2 5 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 AUG 14 PY 2000 VL 85 IS 7 BP 1540 EP 1543 DI 10.1103/PhysRevLett.85.1540 PG 4 WC Physics, Multidisciplinary SC Physics GA 344ER UT WOS:000088745100048 ER PT J AU Walukiewicz, W Shan, W Yu, KM Ager, JW Haller, EE Miotkowski, I Seong, MJ Alawadhi, H Ramdas, AK AF Walukiewicz, W Shan, W Yu, KM Ager, JW Haller, EE Miotkowski, I Seong, MJ Alawadhi, H Ramdas, AK TI Interaction of localized electronic states with the conduction band: Band anticrossing in II-VI semiconductor ternaries SO PHYSICAL REVIEW LETTERS LA English DT Article ID GAINNAS ALLOYS; ZNTE; NITROGEN; EDGE AB We report a strongly nonlinear pressure dependence of the band gaps and large downward shifts of the conduction band edges as functions of composition in ZnSxTe1-x and ZnSeyTe(1-y) alloys. The dependencies are explained by an interaction between localized Al symmetry states of S or Se atoms and the extended states of the ZnTe matrix. These results, combined with previous studies of III-N-V materials define a new, broad class of semiconductor alloys in which the introduction of highly electronegative atoms leads to dramatic modifications of the conduction band structure. The modifications are well described by the recently introduced band anticrossing model. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Sci Mat, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Sci Mat, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Mat Sci & Mineral Engn, Berkeley, CA 94720 USA. Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA. RP Walukiewicz, W (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Sci Mat, Berkeley, CA 94720 USA. RI Yu, Kin Man/J-1399-2012; OI Yu, Kin Man/0000-0003-1350-9642; Ager, Joel/0000-0001-9334-9751 NR 19 TC 146 Z9 150 U1 0 U2 20 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 AUG 14 PY 2000 VL 85 IS 7 BP 1552 EP 1555 DI 10.1103/PhysRevLett.85.1552 PG 4 WC Physics, Multidisciplinary SC Physics GA 344ER UT WOS:000088745100051 ER PT J AU Hamilton, JC Voter, AF AF Hamilton, JC Voter, AF TI Failure of 1D models for Ir island diffusion on Ir(111) SO PHYSICAL REVIEW LETTERS LA English DT Article ID CLUSTERS C1 Sandia Natl Labs, Livermore, CA 94550 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Hamilton, JC (reprint author), Sandia Natl Labs, Livermore, CA 94550 USA. OI Voter, Arthur/0000-0001-9788-7194 NR 5 TC 1 Z9 1 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 AUG 14 PY 2000 VL 85 IS 7 BP 1580 EP 1580 DI 10.1103/PhysRevLett.85.1580 PG 1 WC Physics, Multidisciplinary SC Physics GA 344ER UT WOS:000088745100058 ER PT J AU Kulkarni, A Sampath, S Goland, A Herman, H Dowd, B AF Kulkarni, A Sampath, S Goland, A Herman, H Dowd, B TI Computed microtomography studies to characterize microstructure-property correlations in thermal sprayed alumina deposits SO SCRIPTA MATERIALIA LA English DT Article DE computed microtomography; thermal spraying; ceramics; porosity; thermal conductivity; dielectric properties ID COATINGS C1 SUNY Stony Brook, Stony Brook, NY 11794 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Kulkarni, A (reprint author), SUNY Stony Brook, Stony Brook, NY 11794 USA. NR 10 TC 41 Z9 41 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 1359-6462 J9 SCRIPTA MATER JI Scr. Mater. PD AUG 14 PY 2000 VL 43 IS 5 BP 471 EP 476 DI 10.1016/S1359-6462(00)00416-4 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA 352BR UT WOS:000089195100015 ER PT J AU Campbell, MS Garcia, D Idar, D AF Campbell, MS Garcia, D Idar, D TI Effects of temperature and pressure on the glass transitions of plastic bonded explosives SO THERMOCHIMICA ACTA LA English DT Article; Proceedings Paper CT 26th North-American-Thermal-Analysis-Society Conference CY SEP 13-15, 1998 CL CLEVELAND, OHIO DE PBXs; Kel F 800; nitroplasticizer; estane; glass-transition temperature (T-g); HMX; TATB AB Various plastic bonded explosives (PBXs) contain about 5 wt.% polymer, plasticizer, and stabilizer as binder. The glass-transition temperature (T-g) determines, in part, if the binder will reduce or increase the sensitivity of the PBX to impact. A soft binder reduces the impact sensitivity; however, too soft a binder compromises the mechanical strength below that desirable for dimensional stability. Glass transitions were measured by temperature modulated DSC for PBXs before and after pressing. Pressing temperature was 90 degrees C. The T-g of Estane, a polyester/polyurethane used in some PBX binders, was investigated. Only small changes were observed in the low temperature T-g of the soft segments but larger changes were seen in the higher temperature transitions due to the relaxation of the hard segments. The T-g of Kel F 800, a binder used in insensitive PBX 9502, was observed near ambient temperature. The PBX 9502 had a lower T-g than the neat polymer. Mechanical strength was measured for the samples of PBX 9502. (C) 2000 Elsevier Science B.V. Ail rights reserved. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Campbell, MS (reprint author), Univ Calif Los Alamos Natl Lab, MS C920, Los Alamos, NM 87545 USA. NR 5 TC 17 Z9 19 U1 0 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-6031 J9 THERMOCHIM ACTA JI Thermochim. Acta PD AUG 14 PY 2000 VL 357 BP 89 EP 95 DI 10.1016/S0040-6031(00)00372-5 PG 7 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA 334RW UT WOS:000088200300013 ER PT J AU Pak, J Boller, A Moon, I Pyda, M Wunderlich, B AF Pak, J Boller, A Moon, I Pyda, M Wunderlich, B TI Thermal analysis of paraffins by calorimetry SO THERMOCHIMICA ACTA LA English DT Article; Proceedings Paper CT 26th North-American-Thermal-Analysis-Society Conference CY SEP 13-15, 1998 CL CLEVELAND, OHIO DE thermal analysis; paraffin; phase transition; C50H102; equilibrium; non-equilibrium ID TEMPERATURE-MODULATED CALORIMETRY; DIFFERENTIAL SCANNING CALORIMETRY; POLYMER CRYSTALS; DSC AB Paraffins of sufficient chain length can serve as model compounds for flexible macromolecules. They crystallize almost completely and do not suffer from chain folding as long as their chain length is less than about 10 nm. The melting and crystallization of a paraffin, C50H102 (n-pentacontane), was analyzed as such a model compound with both, standard differential scanning calorimetry (DSC) and temperature-modulated DSC (TMDSC) using saw-tooth modulation and quasi-isothermal modulation with very small amplitude (0.05 K). The supercooling due to nucleation was shown to be strongly cooling-rate dependent. There was practically no supercooling needed for crystallization from the melt with cooling rates up to 10 K/min, and values of up to 10 K were found for cooling rates of 30 K/min. Melting was completed within 1 K with quasi-isothermal modulation, but 66% of total melting occurred over a much narrower temperature range of 0.1 K or less. A 'reversing' melting in the paraffin was detected by TMDSC and the previously proposed integral analysis is found to be a useful tool for quantitative analysis of the thermal transition. Published by Elsevier Science B.V. C1 Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RP Wunderlich, B (reprint author), Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. NR 22 TC 19 Z9 21 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-6031 J9 THERMOCHIM ACTA JI Thermochim. Acta PD AUG 14 PY 2000 VL 357 BP 259 EP 266 DI 10.1016/S0040-6031(00)00396-8 PG 8 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA 334RW UT WOS:000088200300034 ER PT J AU Androsch, R Moon, I Kreitmeier, S Wunderlich, B AF Androsch, R Moon, I Kreitmeier, S Wunderlich, B TI Determination of heat capacity with a sawtooth-type, power-compensated temperature-modulated DSC SO THERMOCHIMICA ACTA LA English DT Article; Proceedings Paper CT 26th North-American-Thermal-Analysis-Society Conference CY SEP 13-15, 1998 CL CLEVELAND, OHIO DE DSC; TMDSC; sawtooth-modulation; Fourier transformation; heat capacity ID DIFFERENTIAL SCANNING CALORIMETRY; GLASS-TRANSITION REGION; PRECISION; ACCURACY; BEHAVIOR AB The determination of the heat capacity in sawtooth-type, power-compensated temperature-modulated differential scanning calorimetry (TMDSC) by evaluation of the first harmonic of the Fourier transformation of the sample temperature and heatflow rate is analyzed with experiments and model calculations. At modulation periods below 100 s, the measured, uncorrected, absolute value of the complex heat capacity deviates exponentially from the true heat capacity, while the steady state within the linear heating and cooling segments is reached after about 50 s, The errors increase with the heat capacity of the sample and vary for different samples and configurations of the measurement. An empirical equation for correction is suggested. It uses a sample-mass and instrument-dependent time constant s(ln) and permits measurements down to periods of 15 s, i.e,, much before steady state is reached within the linear segments of the modulation experiment. (C) 2000 published by Elsevier Science B.V. C1 Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. Univ Regensburg, Inst Expt & Angew Phys, D-93040 Regensburg, Germany. RP Androsch, R (reprint author), Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. NR 26 TC 54 Z9 55 U1 2 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-6031 J9 THERMOCHIM ACTA JI Thermochim. Acta PD AUG 14 PY 2000 VL 357 BP 267 EP 278 DI 10.1016/S0040-6031(00)00397-X PG 12 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA 334RW UT WOS:000088200300035 ER PT J AU Moon, I Androsch, R Wunderlich, B AF Moon, I Androsch, R Wunderlich, B TI A calibration of the various heat-conduction paths for a heat-flux-type temperature-modulated DSC SO THERMOCHIMICA ACTA LA English DT Article; Proceedings Paper CT 26th North-American-Thermal-Analysis-Society Conference CY SEP 13-15, 1998 CL CLEVELAND, OHIO DE temperature-modulated DSC; heat capacity; phase angle; calibration; heat-flux DSC ID DIFFERENTIAL SCANNING CALORIMETRY; CAPACITY MEASUREMENTS; TMDSC AB A study was made of the effects of the heat-conducting paths from the temperature sensor to the sample and from the sample-temperature to the reference-temperature sensors on the determination of heat capacity in a temperature-modulated DSC (TMDSC) of the heat-flux type. These effects are usually assumed to be small. This is shown not to be so, and calibration procedures are developed. Using a simple model calculation, it is demonstrated that the phase angle difference between the sample temperature and the heat-flow rate should be taken into account when determining heat capacity. The results are experimentally verified for aluminum samples with various masses in quasi-isothermal experiments for a wide range of frequencies of temperature modulation for a Mettler-Toledo 820 DSC using no reference pan to simplify the analysis. (C) 2000 Published by Elsevier Science B.V. C1 Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RP Wunderlich, B (reprint author), Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. NR 16 TC 11 Z9 11 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-6031 J9 THERMOCHIM ACTA JI Thermochim. Acta PD AUG 14 PY 2000 VL 357 BP 285 EP 291 DI 10.1016/S0040-6031(00)00399-3 PG 7 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA 334RW UT WOS:000088200300037 ER PT J AU Scurlock, J AF Scurlock, J TI Message to mum SO NEW SCIENTIST LA English DT Letter C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Scurlock, J (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU NEW SCIENTIST PUBL EXPEDITING INC PI ELMONT PA 200 MEACHAM AVE, ELMONT, NY 11003 USA SN 0262-4079 J9 NEW SCI JI New Sci. PD AUG 12 PY 2000 VL 167 IS 2251 BP 52 EP 52 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 344GL UT WOS:000088750800038 ER PT J AU Balestrieri, ML Lee, TC AF Balestrieri, ML Lee, TC TI Regulation of the biosynthesis of acyl analogs of platelet-activating factor by purinergic agonist in endothelial cells SO FEBS LETTERS LA English DT Article DE platelet-activating factor; transacetylase; acetylhydrolase; acyl analog of PAF; translocation; endothelial cell ID COA-INDEPENDENT TRANSACETYLASE; FACTOR-ACETYLHYDROLASE-II; HL-60 CELLS; FACTOR PAF; APOPTOSIS; CERAMIDE; 1-ACYL-2-ACETYL-SN-GLYCERO-3-PHOSPHOCHOLINE; PURIFICATION; GLUTATHIONE; STRESS AB We have previously shown that platelet-activating factor (PAF)-dependent transacetylase: (TA) contains three catalytic activities, namely PAF: lysophospholipid TA (TA(L)), PAF: sphingosine TA (TA(S)) and PAF acetylhydrolase, It serves as a modifier of PAP actions by producing different lipid signal molecules. The TA(L) activity is involved in the biosynthesis of acyl analogs of PAF (acyl-PAF, 1-acyl-2-acetyl-sn-glycero-3-phosphocholine, acylacetyl-GPC) in agonist-stimulated endothelial cells. In the present investigation, we have studied the mechanism(s) by which the TA activity is regulated in ATP-treated endothelial cells. We have demonstrated that ATP, and thiol-modifying agents with ATP, specifically regulate only the TA(L) part of the TA activities, (C) 2000 Federation of European Biochemical Societies, Published by Elsevier Science B.V. All rights reserved. C1 Oak Ridge Associated Univ, Basic & Appl Res Unit, Oak Ridge, TN 37831 USA. Univ Naples 2, Dept Biochem & Biophys F Cedrangolo, I-80138 Naples, Italy. RP Lee, TC (reprint author), Oak Ridge Associated Univ, Basic & Appl Res Unit, Oak Ridge, TN 37831 USA. FU NHLBI NIH HHS [HL-52492] NR 21 TC 5 Z9 5 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0014-5793 J9 FEBS LETT JI FEBS Lett. PD AUG 11 PY 2000 VL 479 IS 1-2 BP 63 EP 66 DI 10.1016/S0014-5793(00)01870-6 PG 4 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA 345CY UT WOS:000088798900013 PM 10940389 ER PT J AU Bourdon, B Goldstein, SJ Bourles, D Murrell, MT Langmuir, CH AF Bourdon, B. Goldstein, S. J. Bourles, D. Murrell, M. T. Langmuir, C. H. TI Evidence from Be-10 and U series disequilibria on the possible contamination of mid-ocean ridge basalt glasses by sedimentary material SO GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS LA English DT Article DE U series; Be-10; basalt; contamination; mid-ocean ridge AB It has often been suggested that U series diseuqilibria measured in mid-ocean ridge basalts (MORB) can be perturbed by contamination with sedimentary or hydrothermal material found near the ridge axis where the basalts are erupted. Here we provide an independent way of estimating the maximum degree of contamination by sediment using constraints from Be-10. Since Be-10 is mostly a cosmogenic nuclide and has a half life of 1.5 x 10(6) years, any Be-10 found in a MORB glass must result from contamination by sedimentary material where cosmogenic Be-10 is enriched. Four MORB samples with a wide range in Th concentations (87-500 ppb) were measured for U decay series and Be-10. No Be-10 above the detection limit (6 x 10(4) to 1 x 10(5) atoms) was measured in the glasses except for one sample that was not picked. Considering in the picked glasses is 10(4) to 10 (5). Mass balance g, the maximum fraction of contaminant and a hypothetical pristine glass with (Pa-231/U-235) = 1 and calculatios between a surficial contaminant and a hypothetical pristine glass with Pa-231 and (230) Th can (Be-10/Be-9) = 0 show that only for the unpicked sample, nearly all the measured excess Pa-231 and Th-230 can accountetd for by contamination. For the other samples, <15% to <1% of the excess Pa-231 and Th-230 can be explained by incorporation of sedimentary material. This study reemphasizes the need for careful sample preparation for U series measurements in MORB, especially at low U levels (<50 ppb). It also confirms that the large U series excesses in carefully picked and cleaned MORB samples are magmatic in origin. C1 [Bourdon, B.] CNRS, IPGP, Lab Geochim & Cosmochim, F-75252 Paris 05, France. [Goldstein, S. J.; Murrell, M. T.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. [Bourles, D.] CNRS, IN2P3, Ctr Spectrometrie Nucl & Spectrometrie Masse, F-91405 Orsay, France. [Bourles, D.] Ctr Europeen Rech & Enseignement Geosci Environm, F-13545 Aix En Provence 04, France. [Langmuir, C. H.] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA. RP Bourdon, B (reprint author), CNRS, IPGP, Lab Geochim & Cosmochim, T14-24,4 Pl Jussieu, F-75252 Paris 05, France. FU CNRS; Office of Basic Energy Sciences, U.S. Department of Energy FX Careful reviews by two anonymous reviewers have greatly helped in improving this paper. We would also like to thank Claude Allegre for a careful reading of the manuscript. B.B. thanks CNRS for support. S. J. G. and M. T. M. wish to acknowledge the Geosciences Research Program, Office of Basic Energy Sciences, U.S. Department of Energy, for support. NR 28 TC 0 Z9 0 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 1525-2027 J9 GEOCHEM GEOPHY GEOSY JI Geochem. Geophys. Geosyst. PD AUG 11 PY 2000 VL 1 PG 12 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA V22JM UT WOS:000208271500001 ER PT J AU Rao, LF Zanonato, P Di Bernardo, P Bismondo, A AF Rao, LF Zanonato, P Di Bernardo, P Bismondo, A TI Calorimetric and spectroscopic studies of Eu(III) complexation with tetramethylmalonamide and tetramethylsuccinamide in acetonitrile and dimethylsulfoxide SO INORGANICA CHIMICA ACTA LA English DT Article DE calorimetry; europium complexes; amide complexes ID NITRIC-ACID SOLUTION; METALLIC ION SOLVATION; ANHYDROUS ACETONITRILE; RARE-EARTH; FT-IR; DIMETHYL-SULFOXIDE; SOLVENT-EXTRACTION; TRIFLUOROMETHANESULFONATE COMPLEXES; DICARBOXYLIC-ACIDS; ALIPHATIC AMIDES AB The complexation of Eu(III) with two N,N,N',N'-alkyl-substituted diamide ligands, tetramethylmalonamide (TMMA) and tetramethylsuccinamide (TMSA), was studied in organic solvents using titration calorimetry, FT IR and luminescence spectroscopy. The formation constants and enthalpy changes of the complexation were determined in pure acetonitrile and in acetonitrile containing small amounts of dimethyl sulfoxide (DMSO). It was observed that TMMA forms stronger complexes with Eu(III) than TMSA in the latter systems, which is attributed to the structural difference between TMMA and TMSA and an entropy effect. The effect of Eu(III) solvation by DMSO on the formation of the Eu(III)-diamide complexes is also discussed. (C) 2000 Elsevier Science S.A. All rights reserved. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Padua, I-35131 Padua, Italy. CNR, Ist Chim & Tecnol Mat Avanzati, Padua, Italy. RP Rao, LF (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 60 TC 19 Z9 19 U1 2 U2 8 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0020-1693 J9 INORG CHIM ACTA JI Inorg. Chim. Acta PD AUG 11 PY 2000 VL 306 IS 1 BP 49 EP 64 DI 10.1016/S0020-1693(00)00148-1 PG 16 WC Chemistry, Inorganic & Nuclear SC Chemistry GA 341RY UT WOS:000088604400008 ER PT J AU Nunomura, W Takakuwa, Y Parra, M Conboy, J Mohandas, N AF Nunomura, W Takakuwa, Y Parra, M Conboy, J Mohandas, N TI Regulation of protein 4.1R, p55, and glycophorin C ternary complex in human erythrocyte membrane SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID BINDING INTERFACE; SKELETAL PROTEIN-4.1; OPTICAL BIOSENSOR; RESONANT MIRROR; CALMODULIN; IDENTIFICATION; PURIFICATION; MODULATION; HOMOLOG; MEMBER AB Three binary protein-protein interactions, glycophorin C (GPC)-4.1R, GPC-p55, and p55-4.1R, constitute the GPC-4.1R-p55 ternary complex in the erythrocyte membrane. Little is known regarding the molecular basis for the interaction of 4.1R with either GPC or p55 and regarding the role of 4.1R in regulating the various protein-protein interactions that constitute the GPC-4.1R-p55 ternary complex. In the present study, we present evidence that sequences in the 30-kDa domain encoded by exon 8 and exon 10 of 4,1R constitute the binding interfaces for GPC and p55, respectively. We further show that 4.1R increases the affinity of p55 binding to GPC by an order of magnitude, implying that 4,1R modulates the interaction between p55 and GPC. Finally, we document that binding of calmodulin to 4.1R decreases the affinity of 4.1R interactions with both p55 and GPC in a Ca2+-dependent manner, implying that the GPC-4.1R-p55 ternary protein complex can undergo dynamic regulation in the erythrocyte membrane. Taken together, these findings have enabled us to identify an important role for 4.1R in regulating the GPC-4.1R-p55 ternary complex in the erythrocyte membrane. C1 Tokyo Womens Med Univ, Sch Med, Dept Biochem, Shinju Ku, Tokyo 1628666, Japan. Lawrence Berkeley Natl Lab, Div Life Sci, Berkeley, CA 94720 USA. RP Mohandas, N (reprint author), Univ Calif Berkeley, Berkeley Natl Lab, Mail Stop 74-157,1 Cyclotron Rd, Berkeley, CA 94720 USA. FU NHLBI NIH HHS [HL31579]; NIDDK NIH HHS [DK 26263, DK 32094] NR 46 TC 75 Z9 78 U1 0 U2 3 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 USA SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD AUG 11 PY 2000 VL 275 IS 32 BP 24540 EP 24546 DI 10.1074/jbc.M002492200 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 343CC UT WOS:000088683300042 PM 10831591 ER PT J AU Toth, EA Worby, C Dixon, JE Goedken, ER Marqusee, S Yeates, TO AF Toth, EA Worby, C Dixon, JE Goedken, ER Marqusee, S Yeates, TO TI The crystal structure of adenylosuccinate lyase from Pyrobaculum aerophilum reveals an intracellular protein with three disulfide bonds SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE lyase; purine biosynthesis; beta-elimination; thermal stability; autism ID TRANSFER RNA-SYNTHETASE; ESCHERICHIA-COLI; BACILLUS-SUBTILIS; ACTIVE-SITE; THIOL; THERMOSTABILITY; IDENTIFICATION; DEHYDROGENASE; POLYMERASE; DEFICIENCY AB Adenylosuccinate lyase catalyzes two separate reactions in the de novo purine biosynthetic pathway. Through its dual action in this pathway, adenylosuccinate lyase plays an integral part in cellular replication and metabolism. Mutations in the human enzyme can result in severe neurological disorders, including mental retardation with autistic features. The crystal structure of adenylosuccinate lyase from the hyperthermophilic archaebacterium Pyrobaculum aerophilum has been determined to 2.1 Angstrom resolution. Although both the fold of the monomer and the architecture of the tetrameric asssembly are similar to adenylosuccinate lyase from the thermophilic eubacterium Thermotoga maritima, the archaebacterial lyase contains unique features. Surprisingly, the structure of adenylosuccinate lyase from P. aerophilum reveals that this intracellular protein contains three disulfide bonds that contribute significantly to its stability against thermal and chemical denaturation. The observation of multiple disulfide bonds in the recombinant form of the enzyme suggests the need for further investigations into whether the intracellular environment of P. aerophilum, and possibly other hyperthermophiles, may be compatible with protein disulfide bond formation. In addition, the protein is shorter in P. aerophilum than it is in other organisms. This abbreviation results from an internal excision of a cluster of helices that may be involved in protein-protein interactions in other organisms and may relate to the observed clinical effects of human mutations in that region. (C) 2000 Academic Press. C1 Univ Calif Los Angeles, Dept Chem & Biochem, Los Angeles, CA 90095 USA. Univ Calif Los Angeles, US DOE, Lab Struct Biol & Mol Med, Los Angeles, CA 90095 USA. Univ Michigan, Sch Med, Dept Biol Chem, Ann Arbor, MI 48109 USA. Univ Calif Berkeley, Dept Mol & Cell Biol, Berkeley, CA 94720 USA. RP Yeates, TO (reprint author), Univ Calif Los Angeles, Dept Chem & Biochem, Box 90095-1569, Los Angeles, CA 90095 USA. OI Yeates, Todd/0000-0001-5709-9839 FU NIDDK NIH HHS [DK18024]; NIGMS NIH HHS [GM07185, GM31299] NR 43 TC 57 Z9 59 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD AUG 11 PY 2000 VL 301 IS 2 BP 433 EP 450 DI 10.1006/jmbi.2000.3970 PG 18 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 345TK UT WOS:000088831100015 PM 10926519 ER PT J AU Marcinow, Z Rabideau, PW AF Marcinow, Z Rabideau, PW TI Synthesis of 7,10-bis(2-halophenyl)tribenzo[c,f,k]fluoranthene as a potential buckybowl precursor SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Article C1 Iowa State Univ, Dept Chem, Ames, IA 50011 USA. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. RP Rabideau, PW (reprint author), Iowa State Univ, Dept Chem, Ames, IA 50011 USA. NR 16 TC 6 Z9 6 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3263 J9 J ORG CHEM JI J. Org. Chem. PD AUG 11 PY 2000 VL 65 IS 16 BP 5063 EP 5065 DI 10.1021/jo0003798 PG 3 WC Chemistry, Organic SC Chemistry GA 345JK UT WOS:000088812700046 ER PT J AU Mullins, SM Hagadorn, JR Bergman, RG Arnold, J AF Mullins, SM Hagadorn, JR Bergman, RG Arnold, J TI Synthesis of tantalum fluoride complexes supported by bis(trimethylsilyl)benzamidinate ligands. X-ray structures of [PhC(NSiMe3)(2)](2)TaF3 and [PhC(NSiMe3)(2)](2)TaFPh2 SO JOURNAL OF ORGANOMETALLIC CHEMISTRY LA English DT Article DE tantalum; amidinate complexes; metal fluoride complexes ID LOW-VALENT CHEMISTRY; ORGANOMETALLIC FLUORIDES; SUBSTITUTION-REACTIONS; CRYSTAL-STRUCTURES; ALKYL DERIVATIVES; METAL; BONDS AB The reaction of [PhC(NSiMe3)(2)]Li(TMEDA) with TaF5 yields complex 1, [PhC(NSiMe3)(2)](2)TaF3, in 40% isolated yield. The solid-state structure of 1 shows a pentagonal, bipyramidal coordination geometry. Variable temperature F-19-NMR experiments reveal one singlet at an ambient temperature; decoalescence to two singlets (1:2 integration) is observed at - 20 degrees C. Complex 1 reacts with Me2Mg to produce [PhC(NSiMe3)(2)](2)TaMe3 (2). The reaction of 1 with Ph2Mg yields [PhC(NSiMe3)(2)](2)TaF2Ph (3) and [PhC(NSiMe3)(2)](2)TaFPh2 (4). Characterization of 4 by X-ray crystallography shows a ligand arrangement similar to that of 1. (C) 2000 Elsevier Science S.A. All rights reserved. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA. RP Bergman, RG (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RI Arnold, John/F-3963-2012 OI Arnold, John/0000-0001-9671-227X NR 36 TC 9 Z9 9 U1 0 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0022-328X J9 J ORGANOMET CHEM JI J. Organomet. Chem. PD AUG 11 PY 2000 VL 607 IS 1-2 BP 227 EP 232 DI 10.1016/S0022-328X(00)00376-4 PG 6 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA 356JX UT WOS:000089441100029 ER PT J AU Krapivsky, PL Ben-Naim, E AF Krapivsky, PL Ben-Naim, E TI Stochastic aggregation: rate equations approach SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Article ID COAGULATION; KINETICS; MODELS AB We investigate a class of stochastic-aggregation processes involving two types of clusters: active and passive. The mass distribution is obtained analytically for several aggregation rates. When the aggregation rate is constant, we find that the mass distribution of passive clusters decays algebraically. Furthermore, the entire range of acceptable decay exponents is possible. For aggregation rates proportional to the cluster masses, we find that gelation is suppressed. In this case, the tail of the mass distribution decays exponentially for large masses, and as a power law over an intermediate size range. C1 Boston Univ, Ctr Polymer Studies, Boston, MA 02215 USA. Boston Univ, Dept Phys, Boston, MA 02215 USA. Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. RP Krapivsky, PL (reprint author), Boston Univ, Ctr Polymer Studies, Boston, MA 02215 USA. RI Ben-Naim, Eli/C-7542-2009; Krapivsky, Pavel/A-4612-2014 OI Ben-Naim, Eli/0000-0002-2444-7304; NR 21 TC 12 Z9 12 U1 1 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0305-4470 J9 J PHYS A-MATH GEN JI J. Phys. A-Math. Gen. PD AUG 11 PY 2000 VL 33 IS 31 BP 5465 EP 5475 DI 10.1088/0305-4470/33/31/302 PG 11 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA 348NL UT WOS:000088990900006 ER PT J AU Ben-Naim, E Krapivsky, PL AF Ben-Naim, E Krapivsky, PL TI Stochastic aggregation: scaling properties SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Article ID DIMENSIONAL BALLISTIC AGGREGATION; ANNIHILATION PROCESSES; KINETICS; STATISTICS; FIELD; GAS AB We study the scaling properties of stochastic aggregation processes in one dimension. Numerical simulations for both diffusive and ballistic transport show that the mass distribution is characterized by two independent non-trivial exponents corresponding to the survival probability of particles and monomers. The overall behaviour agrees qualitatively with the mean-field theory. This theory also provides a useful approximation for the decay exponents, as well as the limiting mass distribution. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. Boston Univ, Ctr Polymer Studies, Boston, MA 02215 USA. Boston Univ, Dept Phys, Boston, MA 02215 USA. RP Ben-Naim, E (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RI Ben-Naim, Eli/C-7542-2009; Krapivsky, Pavel/A-4612-2014 OI Ben-Naim, Eli/0000-0002-2444-7304; NR 36 TC 3 Z9 3 U1 1 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0305-4470 J9 J PHYS A-MATH GEN JI J. Phys. A-Math. Gen. PD AUG 11 PY 2000 VL 33 IS 31 BP 5477 EP 5487 DI 10.1088/0305-4470/33/31/303 PG 11 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA 348NL UT WOS:000088990900007 ER PT J AU Volkow, ND Wang, GJ Fischman, MW Foltin, R Fowler, JS Franceschi, D Franceschi, M Logan, J Gatley, SJ Wong, C Ding, YS Hitzemann, R Pappas, N AF Volkow, ND Wang, GJ Fischman, MW Foltin, R Fowler, JS Franceschi, D Franceschi, M Logan, J Gatley, SJ Wong, C Ding, YS Hitzemann, R Pappas, N TI Effects of route of administration on cocaine induced dopamine transporter blockade in the human brain SO LIFE SCIENCES LA English DT Article DE addiction; reinforcement; imaging; PET; pharmacokinetics ID INTRAVENOUS COCAINE; ABUSE LIABILITY; BINDING; METHYLPHENIDATE; CRACK; PET AB The route of administration influences the reinforcing effects of cocaine. Here we assessed whether there were differences in the efficacy of cocaine to block the dopamine transporters (major target for cocaine's reinforcing effects), as a function of route of administration. Positron emission tomography and [C-11]cocaine, a dopamine transporter radioligand, were used to compare the levels of dopamine transporter blockade induced by intravenous, smoked and intranasal cocaine in 32 current cocaine abusers. In parallel, the temporal course for the self-reports of "high" were obtained. Cocaine significantly blocked dopamine transporters. The levels of blockade were comparable across all routes of administration and a dose effect was observed for intravenous and intranasal cocaine but not for smoked cocaine. For equivalent levels of cocaine in plasma and DAT blockade, smoked cocaine induced significantly greater self reports of "high" than intranasal cocaine and showed a trend for a greater effect than intravenous cocaine. The time to reach peak subjective was significantly faster for smoked (1.4 +/- 0.5 min) than for intravenous cocaine (3.1 +/- 0.9 min), which was faster than intranasal cocaine (14.6 +/- 8 min). Differences in the reinforcing effects of cocaine as a function of the route of administration are not due to differences in the efficacy of cocaine to block the dopamine transporters. The faster time course for the subjective effects for smoked than intravenous and for intravenous than for intranasal cocaine highlights the importance of the speed of cocaine's delivery into the brain on its reinforcing effects. (C) 2000 Elsevier Science Inc, All rights reserved. C1 Brookhaven Natl Lab, Dept Med, Upton, NY 11973 USA. SUNY Stony Brook, Dept Psychiat, Stony Brook, NY 11794 USA. Columbia Univ, Dept Psychiat, New York, NY USA. RP Volkow, ND (reprint author), Brookhaven Natl Lab, Dept Med, Upton, NY 11973 USA. NR 19 TC 7 Z9 7 U1 4 U2 13 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0024-3205 J9 LIFE SCI JI Life Sci. PD AUG 11 PY 2000 VL 67 IS 12 BP PL1507 EP PL1515 PG 9 WC Medicine, Research & Experimental; Pharmacology & Pharmacy SC Research & Experimental Medicine; Pharmacology & Pharmacy GA 345VC UT WOS:000088835000011 ER PT J AU Willott, CJ Rawlings, S Blundell, KM Lacy, M AF Willott, CJ Rawlings, S Blundell, KM Lacy, M TI The quasar fraction in low-frequency-selected complete samples and implications for unified schemes SO MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY LA English DT Article DE galaxies : active; galaxies : evolution; galaxies : nuclei; quasars : general ID ACTIVE GALACTIC NUCLEI; POWERFUL RADIO GALAXIES; 7C REDSHIFT SURVEY; EMISSION-LINE; OPTICAL SPECTROSCOPY; FRII RADIOGALAXIES; SEYFERT-GALAXIES; BLACK-HOLE; EVOLUTION; LUMINOSITIES AB Low-frequency radio surveys are ideal for selecting orientation-independent samples of extragalactic sources because the sample members are selected by virtue of their isotropic steep-spectrum extended emission. We use the new 7C Redshift Survey along with the brighter 3CRR and 6C samples to investigate the fraction of objects with observed broad emission lines - the 'quasar fraction' - as a function of redshift and of radio and narrow-emission-line luminosity. We find that the quasar fraction is more strongly dependent upon luminosity (both narrow-line and radio) than it is on redshift. Above a narrow [OII] emission-line luminosity of log(10)(L([OII])/W) greater than or similar to 35 [or radio luminosity log(10)(L(151)/W Hz(-1) sr(-1)) greater than or similar to 26.5], the quasar fraction is virtually independent of redshift and luminosity; this is consistent with a simple unified scheme with an obscuring torus with a half-opening angle theta(trans) approximate to 53(sigma). For objects with less luminous narrow lines, the quasar fraction is lower. We show that this is not due to the difficulty of detecting lower luminosity broad emission lines in a less luminous, but otherwise similar, quasar population. We discuss evidence which supports at least two probable physical causes for the drop in quasar fraction at low luminosity, (i) a gradual decrease in theta(trans) and/or a gradual increase in the fraction of lightly reddened (0 less than or similar to A(V) less than or equal to 5) lines of sight with decreasing quasar luminosity; and (ii) the emergence of a distinct second population of low luminosity radio sources which, like M87, lack a well-fed quasar nucleus and may well lack a thick obscuring torus. C1 Univ Oxford, Dept Phys, Oxford OX1 3RH, England. Inst Astrofis Canarias, Tenerife 38200, Spain. Lawrence Livermore Natl Lab, IGPP, Livermore, CA 94550 USA. RP Willott, CJ (reprint author), Univ Oxford, Dept Phys, Keble Rd, Oxford OX1 3RH, England. EM cjw@astro.ox.ac.uk NR 69 TC 81 Z9 81 U1 0 U2 0 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0035-8711 J9 MON NOT R ASTRON SOC JI Mon. Not. Roy. Astron. Soc. PD AUG 11 PY 2000 VL 316 IS 3 BP 449 EP 458 DI 10.1046/j.1365-8711.2000.03447.x PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 347BE UT WOS:000088905700004 ER PT J AU Burov, A Marriner, J Shiltsev, V Danilov, V Lambertson, G AF Burov, A Marriner, J Shiltsev, V Danilov, V Lambertson, G TI Beam stability issues in very large hadron collider SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID SUPPRESSION AB The Very Large Hadron Collider (VLHC) is a superconducting proton-proton collider with approximately 100 TeV c.m. energy and approximately 10(34) s(-1) cm(-2) luminosity [G, Dugan, in: Proceedings of the 1999 IEEE Particle Acceleration Conference, New York, 1999, p. 48.](1) Currently, beam dynamics in this future accelerator is the subject of intensive studies within the framework of the US-wide VLHC R&D program. This presentation summarizes recent developments in the field. Besides general discussion on relevant VLHC parameters, we consider various beam instabilities and ways to avoid them. Finally, we outline possibilities for theoretical and experimental R&D. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Fermi Natl Accelerator Lab, Beam Div, Batavia, IL 60510 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Shiltsev, V (reprint author), Fermi Natl Accelerator Lab, Beam Div, POB 500,MS 221, Batavia, IL 60510 USA. NR 29 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 AUG 11 PY 2000 VL 450 IS 2-3 BP 194 EP 206 DI 10.1016/S0168-9002(00)00261-8 PG 13 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 344TT UT WOS:000088775600002 ER PT J AU Fessler, A Massey, TN Micklich, BJ Smith, DL AF Fessler, A Massey, TN Micklich, BJ Smith, DL TI Thick target photon yields and angular distributions for the F-19(p,alpha gamma)O-16 source reaction at incident proton energies between 1.5 and 4.0 MeV SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE thick target photon yield; high-energy gamma-ray source; MCNP calculation; detector response function; Na(I) scintillator; F-19(p,alpha gamma)O-16 reaction ID SCINTILLATION DETECTORS; FLUORINE DETERMINATION; RESPONSE FUNCTIONS; CALIBRATION; RESONANCE; REGION; PIGE AB The absolute thick target yield of 6.129, 6.917 and 7.116 MeV gamma-rays produced from the F-19(p,alpha gamma)O-16 source reaction has been measured for incident proton energies bt tween 1.5 and 4.0 MeV. The angular distributions of the respective gamma-lines have been determined for incident proton energies of 2.0 and 3.0 MeV. The experiments were performed at the 4.5 MV Tandem Van der Graaff accelerator at the Ohio University Edwards Accelerator Laboratory in Athens, Ohio, using a thick CaF2 target and a 7.62 cm x 7.62 cm Na(I) scintillation detector. The Monte Carlo code MCNP was used to calculate detector response functions for the three individual gamma-rays. A least-squares fit of these functions to a selected region in the pulse height spectrum was carried out to determine the relative intensities of these gamma-rays. The uncertainty in the fluence determination is based on the chi(2) Of the fit, the uncertainty in the response functions, the statistics of the data, and the uncertainty in the recording of the proton charge. A maximum photon yield of 1.316 x 10(7) gamma/mu Csr (at 90 degrees) was determined for the sum of these three gamma-rays at the highest incident proton energy of 4.0 MeV. The contribution of the individual lines to the total photon yield depends strongly on the incident proton energy. The angular distributions are isotropic to within 15%. (C) 2000 Elsevier Science B.V, All rights reserved. C1 Argonne Natl Lab, Technol Dev Div, Argonne, IL 60439 USA. Ohio Univ, Inst Nucl & Particle Phys, Athens, OH 45701 USA. RP Micklich, BJ (reprint author), Argonne Natl Lab, Technol Dev Div, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 18 TC 17 Z9 17 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 AUG 11 PY 2000 VL 450 IS 2-3 BP 353 EP 359 DI 10.1016/S0168-9002(00)00303-X PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 344TT UT WOS:000088775600017 ER PT J AU Brooijmans, G AF Brooijmans, G TI Determination of scanning efficiencies in experiments using nuclear emulsion sheets SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE emulsion; neutrino AB During their exposure, nuclear emulsion sheets detect both tracks from experiment-related particles, as well as a considerable amount of background tracks, mainly due to cosmic rays. Unless the exposure has been fairly short, it is therefore fairly likely that a fraction of the tracks that have been identified as belonging to the particles the experiment is interested in, are re-ally due to background. A method, which allows measurement of this fraction reliably directly from the data, is described. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Catholic Univ Louvain, B-3000 Louvain, Belgium. Inst Interuniv Sci Nucl, Brussels, Belgium. RP Brooijmans, G (reprint author), Fermi Natl Accelerator Lab, MS 357,POB 500, Batavia, IL 60510 USA. 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 AUG 11 PY 2000 VL 450 IS 2-3 BP 441 EP 443 DI 10.1016/S0168-9002(00)00279-5 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 344TT UT WOS:000088775600027 ER PT J AU Mihalczo, JT Mullens, JA Mattingly, JK Valentine, TE AF Mihalczo, JT Mullens, JA Mattingly, JK Valentine, TE TI Physical description of nuclear materials identification system (NMIS) signatures SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID PU-U NITRATE; NOISE MEASUREMENTS; MCNP-DSP; SUBCRITICALITY; NEUTRON; PARAMETERS; TANK AB This paper describes all time and frequency analysis parameters measured with a new correlation processor (capability up to 1 GHz sampling rates and up to five input data channels) for three input channels: (1) the Cf-252 source ionization chamber; (2) a detection channel; and (3) a second detection channel. An intuitive and physical description of the various measured quantities is given as well as a brief mathematical description and a brief description of how the data are acquired. If the full five-channel capability is used, the number of measured quantities increases in number but not in type. The parameters provided by this new processor can be divided into two general classes: time analysis signatures and their related frequency analysis signatures. The time analysis signatures include the number of time In pulses occurs in a time interval, that is triggered randomly, upon a detection event, or upon a source fission event triggered. From the number of pulses in a time interval, the moments, factorial moments, and Feynmann variance can be obtained. Recent implementations of third- and fourth-order time and frequency analysis signatures in this processor are also briefly described. Thus, this processor used with a timed source of input neutrons contains all of the information from a pulsed neutron measurement, one and two detector Rossi-alpha measurements, multiplicity measurements, and third- and fourth-order correlation functions. This processor, although originally designed for active measurements with a 252Cf interrogating source, has been successfully used passively (without Cf-252 source) for systems with inherent neutron sources such as fissile systems of plutonium. Data from active measurements with an 18.75 kg highly enriched uranium (93.2 wt%, U-235) metal casting for storage are presented to illustrate some of the various time and frequency analysis parameters. This processor, which is a five-channel time correlation analyzer with time channel widths as small as 1 ns, was developed at the Oak Ridge National Laboratory and the Oak Ridge Y-12 Plant where it is in use for verification and confirmation of weapons components and other fissile materials in storage and for receipts from other Department of Energy and Department of Defense Facilities. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Mihalczo, JT (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA. OI Valentine, Timothy/0000-0001-7495-7348 NR 40 TC 35 Z9 54 U1 1 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 AUG 11 PY 2000 VL 450 IS 2-3 BP 531 EP 555 DI 10.1016/S0168-9002(00)00304-1 PG 25 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 344TT UT WOS:000088775600036 ER PT J AU Zhong, Z Thomlinson, W Chapman, D Sayers, D AF Zhong, Z Thomlinson, W Chapman, D Sayers, D TI Implementation of diffraction-enhanced imaging experiments: at the NSLS and APS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE radiography; diffraction-enhanced imaging; rocking curve ID PHASE-CONTRAST; RADIOGRAPHY AB Diffraction-enhanced imaging is a recently developed X-ray imaging technique that has demonstrated enhanced contrast for dense, highly absorbing materials of interest in materials science and medicine. The implementation of this technique in experiments at the National Synchrotron Light Source and at the Advanced Photon Source is described in detail. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA. European Synchrotron Radiat Facil, F-38043 Grenoble, France. IIT, CSRRI, Chicago, IL 60616 USA. N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA. RP Zhong, Z (reprint author), Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA. RI Chapman, Dean/I-6168-2013 OI Chapman, Dean/0000-0001-6590-4156 NR 18 TC 132 Z9 140 U1 1 U2 9 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 AUG 11 PY 2000 VL 450 IS 2-3 BP 556 EP 567 DI 10.1016/S0168-9002(00)00308-9 PG 12 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA 344TT UT WOS:000088775600037 ER PT J AU Yu, LH Babzien, M Ben-Zvi, I DiMauro, LF Doyuran, A Graves, W Johnson, E Krinsky, S Malone, R Pogorelsky, I Skaritka, J Rakowsky, G Solomon, L Wang, XJ Woodle, M Yakimenko, V Biedron, SG Galayda, JN Gluskin, E Jagger, J Sajaev, V Vasserman, I AF Yu, LH Babzien, M Ben-Zvi, I DiMauro, LF Doyuran, A Graves, W Johnson, E Krinsky, S Malone, R Pogorelsky, I Skaritka, J Rakowsky, G Solomon, L Wang, XJ Woodle, M Yakimenko, V Biedron, SG Galayda, JN Gluskin, E Jagger, J Sajaev, V Vasserman, I TI High-gain harmonic-generation free-electron laser SO SCIENCE LA English DT Article ID AMPLIFIED SPONTANEOUS EMISSION; TRANSIENT ANALYSIS; OUTPUT POWER; AMPLIFICATION; FEL; RADIATION; BUNCH AB A high-gain harmonic-generation free-electron laser is demonstrated. Our approach uses a laser-seeded free-electron laser to produce amplified, longitudinally coherent, Fourier transform-limited output at a harmonic of the seed laser. A seed carbon dioxide laser at a wavelength of 10.6 micrometers produced saturated, amplified free-electron Laser output at the second-harmonic wavelength, 5.3 micrometers. The experiment verifies the theoretical foundation for the technique and prepares the way for the application of this technique in the vacuum ultraviolet region of the spectrum, with the ultimate goal of extending the approach to provide an intense, highly coherent source of hard x-rays. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Yu, LH (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 33 TC 234 Z9 251 U1 8 U2 37 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD AUG 11 PY 2000 VL 289 IS 5481 BP 932 EP 934 DI 10.1126/science.289.5481.932 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 343KH UT WOS:000088701200026 ER PT J AU Yeh, AT Shank, CV McCusker, JK AF Yeh, AT Shank, CV McCusker, JK TI Ultrafast electron localization dynamics following photo-induced charge transfer SO SCIENCE LA English DT Article ID TRANSITION-METAL COMPLEXES; EXCITED-STATE; SOLVATION DYNAMICS; RUTHENIUM(II); SPECTROSCOPY; ANISOTROPY; TRIS(BIPYRIDINE)RUTHENIUM(II); (2+); LUMINESCENT; OSMIUM(II) AB Molecular dynamics occurring in the earliest stages following photo-induced charge transfer were investigated. Femtosecond time-resolved absorption anisotropy measurements on [Ru(bpy)(3)](2+), where bpy is 2,2'-bipyridine, reveal a time dependence in nitrile solutions attributed to initial delocalization of the excited state over all three Ligands followed by charge Localization onto a single Ligand. The localization process is proposed to be coupled to nondiffusive solvation dynamics. In contrast, measurements sampling population dynamics show spectral evolution associated with wave packet motion on the excited state surface that is independent of solvent. The results therefore reveal two important contributions to the evolution of charge transfer states in condensed phase, one that is strongly coupled to the surrounding environment and another that follows a potential internal to the molecule. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP McCusker, JK (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. NR 38 TC 265 Z9 265 U1 9 U2 139 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD AUG 11 PY 2000 VL 289 IS 5481 BP 935 EP 938 DI 10.1126/science.289.5481.935 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 343KH UT WOS:000088701200027 ER PT J AU Hynes, RI Mauche, CW Haswell, CA Shrader, CR Cui, W Chaty, S AF Hynes, RI Mauche, CW Haswell, CA Shrader, CR Cui, W Chaty, S TI The X-ray transient XTE J1118+480: Multiwavelength observations of a low-state minioutburst SO ASTROPHYSICAL JOURNAL LA English DT Article DE accretion, accretion disks; binaries : close; stars : individual (XTE J1118+480); ultraviolet : stars; X-rays : stars ID EXTREME-ULTRAVIOLET; ABSORPTION AB We present multiwavelength observations of the newly discovered X-ray transient XTE J1118+480 obtained in the rising phase of the 2000 April outburst. This source is located at unusually high Galactic latitude and in a very low absorption line of sight. This made the first Extreme Ultraviolet Explorer (EUVE) spectroscopy of an X-ray transient outburst possible, Together with our Hubble Space Telescope, Rossi X-Ray Timing Explorer, and United Kingdom Infrared Telescope data, this gives unprecedented spectral coverage. We find the source in the low hard state. The flat IR-UV continuum appears to be a combination of optically thick disk emission and possibly synchrotron, while at higher energies (including; EUV), a typical low hard state power law is seen. EUVE observations reveal no periodic modulation, suggesting an inclination low enough that no obscuration by the disk rim occurs. We discuss the nature of the source and this outburst and conclude that it may be more akin to minioutbursts seen in GRO J0422+32 than to a normal X-ray transient outburst. C1 Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Open Univ, Dept Phys & Astron, Milton Keynes MK7 6AA, Bucks, England. NASA, Goddard Space Flight Ctr, High Energy Astrophys Lab, Greenbelt, MD 20771 USA. MIT, Space Res Ctr, Cambridge, MA 02139 USA. RP Hynes, RI (reprint author), Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England. NR 31 TC 99 Z9 99 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 SOUTH WOODLAWN AVE, CHICAGO, IL 60637-1603 USA SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 10 PY 2000 VL 539 IS 1 BP L37 EP L40 DI 10.1086/312836 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 347RU UT WOS:000088943600010 ER PT J AU Randles, PW Libersky, LD AF Randles, PW Libersky, LD TI Normalized SPH with stress points SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING LA English DT Article DE meshless methods; smoothed particle hydrodynamics; stress points; boundary conditions ID SMOOTHED PARTICLE HYDRODYNAMICS AB Smoothed particle hydrodynamics is extended to a normalized, staggered particle formulation with boundary conditions. A companion set of interpolation points is introduced that carry the stress, velocity gradient, and other derived field variables. The method is stable, linearly consistent, and has an explicit treatment of boundary conditions. Also, a new method for finding neighbours is introduced which selects a minimal and robust set and is insensitive to anisotropy in the particle arrangement. Test problems show that these improvements lead to increased accuracy and stability. Published in 2000 by John Wiley & Sons, Ltd. C1 Def Threat Reduct Agcy, Kirtland AFB, NM 87117 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Randles, PW (reprint author), Def Threat Reduct Agcy, 1608 Texas St, Kirtland AFB, NM 87117 USA. NR 39 TC 127 Z9 138 U1 2 U2 10 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX PO19 1UD, ENGLAND SN 0029-5981 J9 INT J NUMER METH ENG JI Int. J. Numer. Methods Eng. PD AUG 10 PY 2000 VL 48 IS 10 BP 1445 EP + DI 10.1002/1097-0207(20000810)48:10<1445::AID-NME831>3.0.CO;2-9 PG 21 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA 332CU UT WOS:000088056500002 ER PT J AU Dilts, GA AF Dilts, GA TI Moving least-squares particle hydrodynamics II: conservation and boundaries SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING LA English DT Article DE meshless methods; smooth particle hydrodynamics; moving least squares; Lagrangian hydrodynamics; conservation; boundary conditions AB Previous work by the author has shown that the consistency of the SPH method can be improved to acceptable levels by substituting MLS interpolants for SPH interpolants, that the SPH inconsistency drives the tension instability and that imposition of consistency via MLS severely retards tension instability growth. The new method however was not conservative, and made no provision for boundary conditions. Conservation is an essential property in simulations where large localized mass, momentum or energy transfer occurs such as high-velocity impact or explosion modeling. A new locally conservative MLS Variant of SPH that naturally incorporates realistic boundary conditions is described. In order to provide for the boundary fluxes one must identify the boundary particles. A new, purely geometric boundary detection technique for assemblies of spherical particles is described. A comparison with SPH on a ball-and-plate impact simulation shows qualitative improvement. Copyright (C) 2000 John Wiley & Sons, Ltd. C1 Univ Calif Los Alamos Natl Lab, Hydrodynam Methods Grp, Los Alamos, NM 87545 USA. RP Dilts, GA (reprint author), Univ Calif Los Alamos Natl Lab, Hydrodynam Methods Grp, Mail Stop D413,LANL, Los Alamos, NM 87545 USA. NR 20 TC 79 Z9 84 U1 2 U2 11 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX PO19 1UD, ENGLAND SN 0029-5981 J9 INT J NUMER METH ENG JI Int. J. Numer. Methods Eng. PD AUG 10 PY 2000 VL 48 IS 10 BP 1503 EP + DI 10.1002/1097-0207(20000810)48:10<1503::AID-NME832>3.0.CO;2-D PG 27 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA 332CU UT WOS:000088056500005 ER PT J AU Benoit, J Dandoloff, R Saxena, A AF Benoit, J Dandoloff, R Saxena, A TI Heisenberg spins on a cylinder section SO INTERNATIONAL JOURNAL OF MODERN PHYSICS B LA English DT Article; Proceedings Paper CT Conference on Quantum Many-Body Physics CY MAR, 1999 CL JAWAHARLAL NEHRU UNIV, NEW DELHI, INDIA HO JAWAHARLAL NEHRU UNIV ID GEOMETRICAL FRUSTRATION; TOPOLOGICAL SOLITONS; MAGNETIC POLYMERS; CAVEAT-EMPTOR; FERROMAGNETS; INSTABILITY; MEMBRANES; CURVATURE; STATES; QUEST AB Classical Heisenberg spins in the continuum limit (i.e. the nonlinear sigma -model) are studied on an elastic cylinder section with homogeneous boundary conditions. The latter may serve as a physical realization of magnetically coated microtubules and cylindrical membranes. The corresponding rigid cylinder model exhibits topological soliton configurations with geometrical frustration due to the finite length of the cylinder section. Assuming small and smooth deformations allows to find shapes of the elastic support by relaxing the rigidity constraint: an inhomogeneous Lame equation arises. Finally, this leads to a novel geometric effect: a global shrinking of the cylinder section with swellings. C1 Univ Cergy Pontoise, Lab Phys Theor & Modelisat, F-95302 Cergy Pontoise, France. Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Benoit, J (reprint author), Univ Cergy Pontoise, Lab Phys Theor & Modelisat, F-95302 Cergy Pontoise, France. NR 24 TC 2 Z9 2 U1 0 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 912805, SINGAPORE SN 0217-9792 J9 INT J MOD PHYS B JI Int. J. Mod. Phys. B PD AUG 10 PY 2000 VL 14 IS 19-20 BP 2093 EP 2100 DI 10.1142/S0217979200001242 PG 8 WC Physics, Applied; Physics, Condensed Matter; Physics, Mathematical SC Physics GA 376RY UT WOS:000165471600014 ER PT J AU Wang, WE Kim, YS Hong, HS AF Wang, WE Kim, YS Hong, HS TI Characterization of the vanadium-nitrogen system with nitrogen pressure isobars SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article DE index entries; vanadium-nitrogen; thermodynamic constraints; phase diagram; nitrogen isobars ID THERMODYNAMIC EVALUATION; LIQUID-METALS; OXYGEN SYSTEM; N SYSTEM; TITANIUM; ZR; SOLUBILITY; ALLOYS AB The partial thermodynamic functions of the V-N system from V to VN over the temperature range 1000 to 2100 K have been investigated. The discrepancies among the pressure-composition-temperature (p-C-T) relationships in the delta-VN single-phase region have been resolved. The p-C-T relationships for other phases, where no data were available from the literature, have been established by applying the appropriate thermodynamic constraints and a modified form of Sieverts law. The results are presented as the nitrogen isobars superimposed on the phase diagram. (C) 2000 Elsevier Science S.A. All rights reserved. C1 Argonne Natl Lab, Div Engn, Idaho Falls, ID 83403 USA. Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA. RP Kim, YS (reprint author), Argonne Natl Lab, Div Engn, Idaho Falls, ID 83403 USA. NR 31 TC 6 Z9 7 U1 0 U2 3 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD AUG 10 PY 2000 VL 308 BP 147 EP 152 DI 10.1016/S0925-8388(00)00932-4 PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA 353FR UT WOS:000089264600024 ER PT J AU Tang, YL Kramer, MJ Dennis, KW McCallum, RW AF Tang, YL Kramer, MJ Dennis, KW McCallum, RW TI Nd-Fe-B alloys containing NdAu nano particles SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article DE amorphous; Nd-Fe-B-Au-Cu; melt-spun ribbon; nano-phase ID ADDITIONS; MAGNETS; RIBBONS; CU AB Melt-spun ribbons of Nd-Fe-B modified with Au and/or Cu have been investigated as a function of both composition and cooling rate. When added to stochiometric Nd2Fe14B (2-14-1), Au resulted in the formation of NdAu at the expense of the 2-14-1 phase. The addition of Nd(Au1-xCux) to the stochiometric material (Nd2Fe14B)(95) + Nd-2.5 (Au1-xCux)(2.5) (x = 0-0.3) results in a novel two phase microstructure. As spun alloys solidified at higher wheel speeds (greater than or equal to 25 m/s) contain a two-phase structure consisting of an amorphous Nd-Fe-B matrix with embedded Nd(Au1-xCux) nanophase spheres. The structure of nanocrystalline particles has been characterized with X-ray diffraction, electron microdiffraction and energy dispersive spectroscopy. The formation mechanism of this novel structure evolution under different compositions and processing parameters is discussed. (C) 2000 Elsevier Science S.A. All rights reserved. C1 Iowa State Univ, Dept Mat Sci & Engn, Ames Lab, USDOE, Ames, IA 50011 USA. RP Kramer, MJ (reprint author), Iowa State Univ, Dept Mat Sci & Engn, Ames Lab, USDOE, 37 Wilhelm Hall, Ames, IA 50011 USA. NR 11 TC 1 Z9 1 U1 1 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD AUG 10 PY 2000 VL 308 BP 244 EP 249 DI 10.1016/S0925-8388(00)00845-8 PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA 353FR UT WOS:000089264600038 ER PT J AU Rider, WJ AF Rider, WJ TI Revisiting wall heating SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article DE shock capturing; Lagrangian; Eulerian; reflection ID CONSERVATION-LAWS; ARTIFICIAL VISCOSITY; SHOCKS; HYDRODYNAMICS; DISPERSION; ERRORS; FLUX AB The results of computing a shock reflection are found to strongly depend on the chosen coordinate system, Lagrangian or Eulerian. This is seen by comparing the amount of "wall heating" associated with the solutions to Noh's shock reflection problem computed in each reference frame. Here, an explanation is offered that places a greater burden on the role of phase error or effective wave speed in producing this effect. The reason for the greater difficulties in the Lagrangian frame are the non-uniformity of the mass coordinates in a converging geometry. This produces a non-steady-state discrete shock profile. C1 Univ Calif Los Alamos Natl Lab, Div Appl Phys, Hydrodynam Methods Grp, Los Alamos, NM 87545 USA. RP Rider, WJ (reprint author), Univ Calif Los Alamos Natl Lab, Div Appl Phys, Hydrodynam Methods Grp, Mail Stop D413, Los Alamos, NM 87545 USA. NR 33 TC 22 Z9 23 U1 1 U2 4 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD AUG 10 PY 2000 VL 162 IS 2 BP 395 EP 410 DI 10.1006/jcph.2000.6544 PG 16 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA 343LL UT WOS:000088703800005 ER PT J AU Harrison, TM Yin, A Grove, M Lovera, OM Ryerson, FJ Zhou, XH AF Harrison, TM Yin, A Grove, M Lovera, OM Ryerson, FJ Zhou, XH TI The Zedong Window: A record of superposed Tertiary convergence in southeastern Tibet SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID INDIA-ASIA COLLISION; SOUTHERN TIBET; U-PB; INVERTED METAMORPHISM; THERMAL EVOLUTION; ACTIVATION-ENERGY; VOLCANIC-ROCKS; LHASA BLOCK; MAGMATISM; HIMALAYA AB Determining the timing, magnitude, and location of deformation due to the Indo-Asian collision is widely acknowledged as an important step in understanding how the lithosphere responds during continental collision. A puzzling result of geological investigations of the Lhasa Block over the past 2 decades has been the apparent lack of significant Tertiary deformation there. Perhaps the most important structural feature of the Lhasa Block is the south directed Gangdese Thrust System, which developed along its southern edge. The thrust system, which separates the Andean-type batholith of southern Asia from rocks of Indian affinity, is obscured at most locations across southeastern Tibet by back thrusts of the younger, north directed Renbu Zedong Thrust System. The best documented site where both thrusts are exposed occurs near Zedong (Zedong Window). Systematic geochronologic analyses were conducted in this area. U-Pb zircon dating of three samples of a synkinematically to postkinematically deformed hanging wall granitoid (the Yaja granodiorite) cut by the Gangdese Thrust indicates a crystallization age of 30.4+/-0.4 Ma (2 sigma), thus placing an upper bound on the initiation of the thrust, U-Pb zircon dating of granitoid samples structurally higher in the Gangdese hanging wall yields emplacement ages of 42.5+/-1.0 Ma and 48.9+/-0.8 Ma (2 sigma), similar to other magmatic complexes within the Gangdese are. Geochemical results are consistent with these plutons forming in the same environment as precollisional intrusions within the Gangdese batholith, suggesting a significant post-collisional input of juvenile heat. The Ar-40/Ar-39 thermochronology of samples from a vertical section through the hanging wall within the Yaja granodiorite, coupled with results of a numerical thermal model, indicate an average slip rate along the Gangdese Thrust of 7 mm/yr between 30 and 23 Ma and a minimum displacement of similar to 50 km, Farther east in the Zedong: Window, thermal effects produced by later north directed thrust sheets of the Renbu Zedong system appear to have obscured thermal history signatures in the Gangdese hanging wall related to earlier south directed thrusting. Thermochronological results from this region indicate that thermal overprinting related to the north directed thrusting occurred between 25 and 10 Ma, consistent with previous estimates. C1 Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90095 USA. Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA. Univ Calif Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. Acad Sinica, Inst Geol, Beijing 100029, Peoples R China. RP Harrison, TM (reprint author), Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90095 USA. EM tmh@argon.ess.ucla.edu; yin@ess.ucla.edu; marty@argon.ess.ucla.edu; lovera@argon.ess.ucla.edu; ryerson@llnl.gov; zhouxh@public3.bta.net.cn RI Harrison, Timothy/E-7443-2012; Yin, An/B-3050-2014; UCLA, SIMS/A-1459-2011 NR 67 TC 119 Z9 159 U1 3 U2 26 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 AUG 10 PY 2000 VL 105 IS B8 BP 19211 EP 19230 DI 10.1029/2000JB900078 PG 20 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 345BB UT WOS:000088794600022 ER PT J AU Eppler, AS Rupprechter, G Anderson, EA Somorjai, GA AF Eppler, AS Rupprechter, G Anderson, EA Somorjai, GA TI Thermal and chemical stability and adhesion strength of Pt nanoparticle arrays supported on silica studied by transmission electron microscopy and atomic force microscopy SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID MELTING TEMPERATURE; MODEL CATALYSTS; SMALL PARTICLES; GOLD PARTICLES; CLUSTERS; MECHANISM AB The thermal, chemical, and mechanical stability of Pt nanoparticles supported on silica has been measured with transmission electron microscopy (TEM) and atomic force microscopy (AFM). The nanoparticle arrays were fabricated using electron beam lithography, which produced uniform particle sizes (20 +/- 1 nm) and uniform interparticle distances (150 +/- 1 nm). TEM studies provided information about the array periodicity, particle dimensions, and crystallinity of individual particles. Before heat treatments, individual Pt nanoparticles were found to be polycrystalline with crystalline domain sizes of 4-8 nm. After heating to 1000 K in high vacuum (10(-7) Torr) and 1 atm H-2, the crystalline domain sizes within individual particles grew larger, without noticeable deformation of the array. A similar enlargement of crystalline domains was seen in 1 arm O-2 at a lower temperature of 700 K. Using contact mode AFM, the height, periodicity, and adhesion of the particles were determined. On a newly prepared sample, Pt particles were displaced from the silica support by the AFM tip with approximately 10 nN lateral force. The interfacial adhesion energy between the Pt and SiO2 was on the order of 1 mJ/m(2), which is relatively weak bonding. After heating, the Pt particles could not be displaced by the AFM tip, suggesting that heat treatments had increased the bonding between the Pt and SiO2. The stability and uniformity of the nanoparticle arrays make them ideal model catalysts for reactions in either oxidizing or reducing conditions. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Max Planck Gesell, Fritz Haber Inst, Dept Phys Chem, D-14195 Berlin, Germany. RP Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. NR 21 TC 62 Z9 62 U1 2 U2 18 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1520-6106 J9 J PHYS CHEM B JI J. Phys. Chem. B PD AUG 10 PY 2000 VL 104 IS 31 BP 7286 EP 7292 DI 10.1021/jp0006429 PG 7 WC Chemistry, Physical SC Chemistry GA 343CG UT WOS:000088683700008 ER PT J AU Wilcoxon, JP AF Wilcoxon, JP TI Catalytic photooxidation of pentachlorophenol using semiconductor nanoclusters SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID HETEROGENEOUS PHOTOCATALYSIS; PHOTODEGRADATION; DETOXIFICATION; PARTICLES AB Pentachlorophenol (PCP) is a toxic chlorinated aromatic molecule widely used as a fungicide, a bactericide, and a wood preservation, and thus is ubiquitous in the environment. We report photooxidation of PCP using a variety of nanosize semiconductor metal oxides and sulfides in both aqueous and polar organic solvents and compare the photooxidation kinetics of these nanoclusters to widely studied bulk powders such as Degussa P25 TiO2 and CdS. We study both the light- intensity dependence of PCP photooxidation for nanosize SnO2 and the size dependence of PCP photooxidation for both nanosize SnO2 and MoS2. We find an extremely strong size dependence for the latter which we attribute to its size-dependent band gap and the associated change in redox potentials due to quantum confinement of the hole-electron pair. We show that nanosize MoS2 with a diameter of d = 3.0 nm and an absorbance edge of similar to 450 nm is a very effective photooxidation catalyst for complete PCP mineralization, even when using only visible-light irradiation. C1 Sandia Natl Labs, Dept 1152, Albuquerque, NM 87185 USA. RP Wilcoxon, JP (reprint author), Sandia Natl Labs, Dept 1152, Albuquerque, NM 87185 USA. NR 18 TC 81 Z9 84 U1 5 U2 32 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD AUG 10 PY 2000 VL 104 IS 31 BP 7334 EP 7343 DI 10.1021/jp0012653 PG 10 WC Chemistry, Physical SC Chemistry GA 343CG UT WOS:000088683700015 ER PT J AU Rodriguez, JA Jirsak, T Freitag, A Larese, J Maiti, A AF Rodriguez, JA Jirsak, T Freitag, A Larese, J Maiti, A TI Interaction of SO2 with MgO(100) and Cu/MgO(100): Decomposition reactions and the formation of SO3 and SO4 SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID SURFACE ELECTRONIC-STRUCTURE; DENSITY-FUNCTIONAL THEORY; AB-INITIO CALCULATIONS; FIRST-PRINCIPLES; MOLECULAR-DYNAMICS; TIO2(110) SURFACE; MGO(001) SURFACE; METAL-SURFACES; OXIDE-FILMS; ADSORPTION AB Synchrotron-based high-resolution photoemission and first-principles density functional calculations (DFT-GGA) were used to study the interaction of SO2 with clean and modified (OH, Odelta-, O vacancies, or Cu adatoms present) MgO(100) surfaces. The reaction of the molecule with pure and hydroxylated powders of Mf;O was investigated using X-ray absorption near-edge spectroscopy (XANES). At 100 K, the main product of the adsorption of sulfur dioxide on MgO(100) is sulfite (SO2.gas + O-lattice --> SO3,ads) NO evidence is found for bonding of SO2 to Mg sites of the surface or decomposition of the molecule. DFT calculations show that a eta(3)-S,O,O adsorption configuration leads to a SO3-like species, and this is much more stable than configurations which involve bonding to only Mg sites or formation of SO4. On a flat MgO(100) substrate, the formation of SO4 is not energetically viable. A SO3 --> SO4 transformation is observed at temperatures between 150 and 450 K with a substantial reconstruction of the oxide surface. From 450 to 650 K, the adsorbed SO3/SO4 species decompose and SO2 desorbs back into gas phase. The presence of OH groups and 0(delta-) (delta < 2) species on MgO favors the formation of SO4 at the expense of SO3. On the other hand, the creation of O vacancies in MgO(100) by ion sputtering leads to decomposition of SO2. The chemistry of SO2 on Cu/MgO-(100) surfaces is rich. At 150 K, the SO2 molecule chemisorbs intact on the supported Cu particles and forms SO3 on the oxide substrate. Heating to room temperature induces full decomposition of SO2 and the formation of SO4, The Cu adatoms facilitate the decomposition of SO2 by providing electronic states that are very efficient for interactions with the lowest unoccupied molecular orbital (S-O antibonding) of the molecule. C1 Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. Mol Simulat Inc, San Diego, CA 92121 USA. RP Rodriguez, JA (reprint author), Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA. EM rodrigez@bnl.gov NR 92 TC 56 Z9 56 U1 4 U2 27 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1520-6106 J9 J PHYS CHEM B JI J. Phys. Chem. B PD AUG 10 PY 2000 VL 104 IS 31 BP 7439 EP 7448 DI 10.1021/jp000806l PG 10 WC Chemistry, Physical SC Chemistry GA 343CG UT WOS:000088683700030 ER PT J AU Thiel, PA Dubois, JM AF Thiel, PA Dubois, JM TI Quasicrystals - Electrons in a strange sea SO NATURE LA English DT Editorial Material ID QUASI-CRYSTALS C1 Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Chem, Ames, IA 50011 USA. Ecole Mines, Sci & Genie Mat Met Lab, INPL, CNRS,UMR 7584, F-54042 Nancy, France. RP Thiel, PA (reprint author), Iowa State Univ, Ames Lab, 1605 Gilman Hall, Ames, IA 50011 USA. NR 7 TC 18 Z9 18 U1 1 U2 6 PU MACMILLAN PUBLISHERS LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 J9 NATURE JI Nature PD AUG 10 PY 2000 VL 406 IS 6796 BP 570 EP 573 DI 10.1038/35020657 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 342PF UT WOS:000088653800024 ER PT J AU Cumings, J Collins, PG Zettl, A AF Cumings, J Collins, PG Zettl, A TI Materials - Peeling and sharpening multiwall nanotubes SO NATURE LA English DT Article ID WALLED CARBON NANOTUBES C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. EM azettl@physics.berkeley.edu RI Cumings, John/A-3595-2012; Zettl, Alex/O-4925-2016 OI Zettl, Alex/0000-0001-6330-136X NR 10 TC 117 Z9 118 U1 0 U2 23 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 AUG 10 PY 2000 VL 406 IS 6796 BP 586 EP 586 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 342PF UT WOS:000088653800036 ER PT J AU Rotenberg, E Theis, W Horn, K Gille, P AF Rotenberg, E Theis, W Horn, K Gille, P TI Quasicrystalline valence bands in decagonal AlNiCo SO NATURE LA English DT Article ID QUASI-CRYSTALS; LOCALIZATION; DISPERSION; ELECTRONS AB Quasicrystals are metallic alloys that possess perfect long-range structural order, in spite of the fact that their rotational symmetries are incompatible with long-range periodicity. The exotic structural properties of this class of materials(1) are accompanied by physical properties that are unexpected for metallic alloys. Considerable progress in resolving the geometric structures of quasicrystals has been made using X-ray and neutron diffraction, and concepts such as the quasi-unit-cell model(2) have provided theoretical insights. But the basic properties of the valence electronic states-whether they are extended as in periodic crystals or localized as in amorphous materials-are still largely unresolved(3). Here we investigate the electronic bandstructure of quasicrystals through angle-resolved photoemission experiments on decagonal Al71.8Ni14.8Co13.4. We rnd that the s-p and d states exhibit band-like behaviour with the symmetry of the quasiperiodic lattice, and that the Fermi level is crossed by dispersing d-bands. The observation of free-electron-like bands, distributed in momentum space according to the surface diffraction pattern, suggests that the electronic states are not dominated by localization. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA. Free Univ Berlin, Inst Expt Phys, D-14195 Berlin, Germany. Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany. Univ Munich, Inst Kristallog & Angew Mineral, D-80333 Munich, Germany. RP Rotenberg, E (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, MS2-400, Berkeley, CA 94720 USA. RI Rotenberg, Eli/B-3700-2009 OI Rotenberg, Eli/0000-0002-3979-8844 NR 19 TC 70 Z9 71 U1 1 U2 22 PU MACMILLAN PUBLISHERS LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 J9 NATURE JI Nature PD AUG 10 PY 2000 VL 406 IS 6796 BP 602 EP 605 DI 10.1038/35020519 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 342PF UT WOS:000088653800040 ER PT J AU Sass, HJ Buldt, G Gessenich, R Hehn, D Neff, D Schlesinger, R Berendzen, J Ormos, P AF Sass, HJ Buldt, G Gessenich, R Hehn, D Neff, D Schlesinger, R Berendzen, J Ormos, P TI Structural alterations for proton translocation in the M state of wild-type bacteriorhodopsin SO NATURE LA English DT Article ID TRANSFORM-INFRARED-SPECTROSCOPY; X-RAY-DIFFRACTION; NEUTRON-DIFFRACTION; ANGSTROM RESOLUTION; WATER MOLECULE; SCHIFF-BASE; PHOTOCYCLE; INTERMEDIATE; MODEL; CRYSTALLOGRAPHY AB The transport of protons across membranes is an important process in cellular bioenergetics. The light-driven proton pump bacteriorhodopsin is the best-characterized protein providing this function. Photon energy is absorbed by the chromophore retinal, covalently bound to Lys 216 via a protonated Schiff base. The light-induced all-trans to 13-cis isomerization of the retinal results in deprotonation of the Schiff base followed by alterations in protonatable groups within bacteriorhodopsin. The changed force field induces changes, even in the tertiary structure(1-3), which are necessary for proton pumping. The recent report(4) of a high-resolution X-ray crystal structure for the late M intermediate of a mutant bacteriorhopsin (with Asp 96-->Asn) displays the structure of a proton pathway highly disturbed by the mutation. To observe an unperturbed proton pathway, we determined the structure of the late M intermediate of wild-type bacteriorhodopsin (2.25 Angstrom resolution). The cytoplasmic side of our M(2) structure shows a water net that allows proton transfer from the proton donor group Asp 96 towards the Schiff base. An enlarged cavity system above Asp 96 is observed, which facilitates the de- and reprotonation of this group by fluctuating water molecules in the last part of the cycle. C1 Forschungszentrum Julich, Inst Biol Struct, D-52425 Julich, Germany. Los Alamos Natl Lab, Biophys Grp, Los Alamos, NM 87545 USA. Hungarian Acad Sci, Biol Res Ctr, Inst Biophys, H-6701 Szeged, Hungary. RP Buldt, G (reprint author), Forschungszentrum Julich, Inst Biol Struct, Postfach 1913, D-52425 Julich, Germany. EM g.bueldt@fz-juelich.de RI Buldt, Georg/K-5345-2013; Buldt, Georg/H-9509-2014; OI Ormos, Pal/0000-0003-2541-5686 NR 28 TC 279 Z9 286 U1 1 U2 15 PU NATURE PUBLISHING GROUP PI LONDON PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 J9 NATURE JI Nature PD AUG 10 PY 2000 VL 406 IS 6796 BP 649 EP 653 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 342PF UT WOS:000088653800053 PM 10949308 ER PT J AU Eichberg, MJ Dorta, RL Lamottke, K Vollhardt, KPC AF Eichberg, MJ Dorta, RL Lamottke, K Vollhardt, KPC TI The formal total synthesis of (+/-)-strychnine via a cobalt-mediated [2+2+2]cycloaddition SO ORGANIC LETTERS LA English DT Article ID WIELAND-GUMLICH ALDEHYDE; ASPIDOSPERMATAN-TYPE ALKALOIDS; 2,3-DOUBLE BOND; ALKYNES; (-)-STRYCHNINE; CONSTRUCTION; CYCLIZATION; STRYCHNINE; PALLADIUM; NUCLEUS AB [GRAPHICS] A short, highly convergent total synthesis of racemic isostrychnine, and thus strychnine, has been completed. The route involves 14 steps in the longest linear sequence and is highlighted by a cobalt mediated [2 + 2 + 2]cycloaddition of an alkynylindole nucleus to acetylene. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA. RP Eichberg, MJ (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RI Dorta, Rosa/K-2914-2014; Lamottke, Kai/J-1881-2016 OI Dorta, Rosa/0000-0002-4565-0301; Lamottke, Kai/0000-0002-3265-1057 NR 28 TC 66 Z9 66 U1 24 U2 41 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1523-7060 J9 ORG LETT JI Org. Lett. PD AUG 10 PY 2000 VL 2 IS 16 BP 2479 EP 2481 DI 10.1021/ol006131m PG 3 WC Chemistry, Organic SC Chemistry GA 341TG UT WOS:000088605200023 PM 10956526 ER PT J AU Breitweg, J Chekanov, S Derrick, M Krakauer, D Magill, S Musgrave, B Pellegrino, A Repond, J Stanek, R Yoshida, R Mattingly, MCK Abbiendi, G Anselmo, F Antonioli, P Bari, G Basile, M Bellagamba, L Boscherini, D Bruni, A Bruni, G Romeo, GC Castellini, G Cifarelli, L Cindolo, F Contin, A Coppola, N Corradi, M De Pasquale, S Giusti, P Iacobucci, G Laurenti, G Levi, G Margotti, A Massam, T Nania, R Palmonari, F Pesci, A Polini, A Sartorelli, G Garcia, YZ Zichichi, A Amelung, C Bornheim, A Brock, I Coboken, K Crittenden, J Deffner, R Hartmann, H Heinloth, K Hilger, E Irrgang, P Jakob, HP Kappes, A Katz, UF Kerger, R Paul, E Schnurbusch, H Stifutkin, A Tandler, J Voss, KC Weber, A Wieber, H Bailey, DS Barret, O Brook, NH Foster, B Heath, GP Heath, HF McFall, JD Piccioni, D Rodrigues, E Scott, J Tapper, RJ Capua, M Mastroberardino, A Schioppa, M Susinno, G Jeoung, HY Kim, JY Lee, JH Lim, IT Ma, KJ Pac, MY Caldwell, A Liu, W Liu, X Mellado, B Paganis, S Sampson, S Schmidke, WB Sciulli, F Chwastowski, J Eskreys, A Figiel, J Klimek, K Olkiewicz, K Piotrzkowski, K Przybycien, MB Stopa, P Zawiejski, L Bednarek, B Jelen, K Kisielewska, D Kowal, AM Kowalski, T Przybycien, M Rulikowska-Zarebska, E Suszycki, L Szuba, D Kotanski, A Bauerdick, LAT Behrens, U Bienlein, JK Burgard, C Dannheim, D Desler, K Drews, G Fox-Murphy, A Fricke, U Goebel, F Gottlicher, P Graciani, R Haas, T Hain, W Hartner, GF Hasell, D Hebbel, K Johnson, KF Kasemann, M Koch, W Kotz, U Kowalski, H Lindemann, L Lohr, B Martinez, M Milite, M Monteiro, T Moritz, M Notz, D Pelucchi, F Petrucci, MC Rohde, M Saull, PRB Savin, AA Schneekloth, U Selonke, F Sievers, M Stonjek, S Tassi, E Wolf, G Wollmer, U Youngman, C Zeuner, W Coldewey, C Viani, ALD Meyer, A Schlenstedt, S Straub, PB Barbagli, G Gallo, E Pelfer, P Maccarrone, G Votano, L Bamberger, A Benen, A Eisenhardt, S Markun, P Raach, H Wolfle, S Bussey, PJ Bell, M Doyle, AT Lee, SW Lupi, A Macdonald, N McCance, GJ Saxon, DH Sinclair, LE Skillicorn, IO Waugh, R Bohnet, I Gendner, N Holm, U Meyer-Larsen, A Salehi, H Wick, K Garfagnini, A Gialas, I Gladilin, LK Kcira, D Klanner, R Lohrmann, E Poelz, G Zetsche, F Goncalo, R Long, KR Miller, DB Tapper, AD Walker, R Mallik, U Cloth, P Filges, D Ishii, T Kuze, M Nagano, K Tokushuku, K Yamada, S Yamazaki, Y Ahn, SH Lee, SB Park, SK Lim, H Park, IH Son, D Barreiro, F Garcia, G Glasman, C Gonzalez, O Labarga, L del Peso, J Redondo, I Terron, J Barbi, M Corriveau, F Hanna, DS Ochs, A Padhi, S Riveline, M Stairs, DG Wing, M Tsurugai, T Antonov, A Bashkirov, V Danilov, M Dolgoshein, BA Gladkov, D Sosnovtsev, V Suchkov, S Dementiev, RK Ermolov, PF Golubkov, YA Katkov, II Khein, LA Korotkova, NA Korzhavina, IA Kuzmin, VA Lukina, OY Proskuryakov, AS Shcheglova, LM Solomin, AN Vlasov, NN Zotkin, SA Bokel, C Botje, M Brummer, N Engelen, J Grijpink, S Koffeman, E Kooijman, P Schagen, S van Sighem, A Tiecke, H Tuning, N Velthuis, JJ Vossebeld, J Wiggers, L de Wolf, E Acosta, D Bylsma, B Durkin, LS Gilmore, J Ginsburg, CM Kim, CL Ling, TY Boogert, S Cooper-Sarkar, AM Devenish, RCE Grosse-Knetter, J Matsushita, T Quadt, A Ruske, O Sutton, MR Walczak, R Bertolin, A Brugnera, R Carlin, R Dal Corso, F Dosselli, U Dusini, S Limentani, S Morandin, M Posocco, M Stanco, L Stroili, R Turcato, M Voci, C Adamczyk, L Iannotti, L Oh, BY Okrasinski, JR Toothacker, WS Whitmore, JJ Iga, Y D'Agostini, G Marini, G Nigro, A Cormack, C Hart, JC McCubbin, NA Shah, TP Epperson, D Heusch, C Sadrozinski, HFW Seiden, A Wichmann, R Williams, DC Pavel, N Abramowicz, H Dagan, S Kananov, S Kreisel, A Levy, A Abe, T Fusayasu, T Umemori, K Yamashita, T Hamatsu, R Hirose, T Inuzuka, M Kitamura, S Nishimura, T Arneodo, M Cartiglia, N Cirio, R Costa, M Ferrero, MI Maselli, S Monaco, V Peroni, C Ruspa, M Sacchi, R Solano, A Staiano, A Dardo, M Bailey, DC Fagerstroem, CP Galea, R Koop, T Levman, GM Martin, JF Orr, RS Polenz, S Sabetfakhri, A Simmons, D Butterworth, JM Catterall, CD Hayes, ME Heaphy, EA Jones, TW Lane, JB West, BJ Ciborowski, J Ciesielski, R Grzelak, G Nowak, RJ Pawlak, JM Pawlak, R Smalska, B Tymieniecka, T Wroblewski, AK Zakrzewski, JA Zarnecki, AF Adamus, M Gadaj, T Deppe, O Eisenberg, Y Hochman, D Karshon, U Badgett, WF Chapin, D Cross, R Foudas, C Mattingly, S Reeder, DD Smith, WH Vaiciulis, A Wildschek, T Wodarczyk, M Deshpande, A Dhawan, S Hughes, VW Bhadra, S Catterall, C Cole, JE Frisken, WR Hall-Wilton, R Khakzad, M Menary, S AF Breitweg, J Chekanov, S Derrick, M Krakauer, D Magill, S Musgrave, B Pellegrino, A Repond, J Stanek, R Yoshida, R Mattingly, MCK Abbiendi, G Anselmo, F Antonioli, P Bari, G Basile, M Bellagamba, L Boscherini, D Bruni, A Bruni, G Romeo, GC Castellini, G Cifarelli, L Cindolo, F Contin, A Coppola, N Corradi, M De Pasquale, S Giusti, P Iacobucci, G Laurenti, G Levi, G Margotti, A Massam, T Nania, R Palmonari, F Pesci, A Polini, A Sartorelli, G Garcia, YZ Zichichi, A Amelung, C Bornheim, A Brock, I Coboken, K Crittenden, J Deffner, R Hartmann, H Heinloth, K Hilger, E Irrgang, P Jakob, HP Kappes, A Katz, UF Kerger, R Paul, E Schnurbusch, H Stifutkin, A Tandler, J Voss, KC Weber, A Wieber, H Bailey, DS Barret, O Brook, NH Foster, B Heath, GP Heath, HF McFall, JD Piccioni, D Rodrigues, E Scott, J Tapper, RJ Capua, M Mastroberardino, A Schioppa, M Susinno, G Jeoung, HY Kim, JY Lee, JH Lim, IT Ma, KJ Pac, MY Caldwell, A Liu, W Liu, X Mellado, B Paganis, S Sampson, S Schmidke, WB Sciulli, F Chwastowski, J Eskreys, A Figiel, J Klimek, K Olkiewicz, K Piotrzkowski, K Przybycien, MB Stopa, P Zawiejski, L Bednarek, B Jelen, K Kisielewska, D Kowal, AM Kowalski, T Przybycien, M Rulikowska-Zarebska, E Suszycki, L Szuba, D Kotanski, A Bauerdick, LAT Behrens, U Bienlein, JK Burgard, C Dannheim, D Desler, K Drews, G Fox-Murphy, A Fricke, U Goebel, F Gottlicher, P Graciani, R Haas, T Hain, W Hartner, GF Hasell, D Hebbel, K Johnson, KF Kasemann, M Koch, W Kotz, U Kowalski, H Lindemann, L Lohr, B Martinez, M Milite, M Monteiro, T Moritz, M Notz, D Pelucchi, F Petrucci, MC Rohde, M Saull, PRB Savin, AA Schneekloth, U Selonke, F Sievers, M Stonjek, S Tassi, E Wolf, G Wollmer, U Youngman, C Zeuner, W Coldewey, C Viani, ALD Meyer, A Schlenstedt, S Straub, PB Barbagli, G Gallo, E Pelfer, P Maccarrone, G Votano, L Bamberger, A Benen, A Eisenhardt, S Markun, P Raach, H Wolfle, S Bussey, PJ Bell, M Doyle, AT Lee, SW Lupi, A Macdonald, N McCance, GJ Saxon, DH Sinclair, LE Skillicorn, IO Waugh, R Bohnet, I Gendner, N Holm, U Meyer-Larsen, A Salehi, H Wick, K Garfagnini, A Gialas, I Gladilin, LK Kcira, D Klanner, R Lohrmann, E Poelz, G Zetsche, F Goncalo, R Long, KR Miller, DB Tapper, AD Walker, R Mallik, U Cloth, P Filges, D Ishii, T Kuze, M Nagano, K Tokushuku, K Yamada, S Yamazaki, Y Ahn, SH Lee, SB Park, SK Lim, H Park, IH Son, D Barreiro, F Garcia, G Glasman, C Gonzalez, O Labarga, L del Peso, J Redondo, I Terron, J Barbi, M Corriveau, F Hanna, DS Ochs, A Padhi, S Riveline, M Stairs, DG Wing, M Tsurugai, T Antonov, A Bashkirov, V Danilov, M Dolgoshein, BA Gladkov, D Sosnovtsev, V Suchkov, S Dementiev, RK Ermolov, PF Golubkov, YA Katkov, II Khein, LA Korotkova, NA Korzhavina, IA Kuzmin, VA Lukina, OY Proskuryakov, AS Shcheglova, LM Solomin, AN Vlasov, NN Zotkin, SA Bokel, C Botje, M Brummer, N Engelen, J Grijpink, S Koffeman, E Kooijman, P Schagen, S van Sighem, A Tiecke, H Tuning, N Velthuis, JJ Vossebeld, J Wiggers, L de Wolf, E Acosta, D Bylsma, B Durkin, LS Gilmore, J Ginsburg, CM Kim, CL Ling, TY Boogert, S Cooper-Sarkar, AM Devenish, RCE Grosse-Knetter, J Matsushita, T Quadt, A Ruske, O Sutton, MR Walczak, R Bertolin, A Brugnera, R Carlin, R Dal Corso, F Dosselli, U Dusini, S Limentani, S Morandin, M Posocco, M Stanco, L Stroili, R Turcato, M Voci, C Adamczyk, L Iannotti, L Oh, BY Okrasinski, JR Toothacker, WS Whitmore, JJ Iga, Y D'Agostini, G Marini, G Nigro, A Cormack, C Hart, JC McCubbin, NA Shah, TP Epperson, D Heusch, C Sadrozinski, HFW Seiden, A Wichmann, R Williams, DC Pavel, N Abramowicz, H Dagan, S Kananov, S Kreisel, A Levy, A Abe, T Fusayasu, T Umemori, K Yamashita, T Hamatsu, R Hirose, T Inuzuka, M Kitamura, S Nishimura, T Arneodo, M Cartiglia, N Cirio, R Costa, M Ferrero, MI Maselli, S Monaco, V Peroni, C Ruspa, M Sacchi, R Solano, A Staiano, A Dardo, M Bailey, DC Fagerstroem, CP Galea, R Koop, T Levman, GM Martin, JF Orr, RS Polenz, S Sabetfakhri, A Simmons, D Butterworth, JM Catterall, CD Hayes, ME Heaphy, EA Jones, TW Lane, JB West, BJ Ciborowski, J Ciesielski, R Grzelak, G Nowak, RJ Pawlak, JM Pawlak, R Smalska, B Tymieniecka, T Wroblewski, AK Zakrzewski, JA Zarnecki, AF Adamus, M Gadaj, T Deppe, O Eisenberg, Y Hochman, D Karshon, U Badgett, WF Chapin, D Cross, R Foudas, C Mattingly, S Reeder, DD Smith, WH Vaiciulis, A Wildschek, T Wodarczyk, M Deshpande, A Dhawan, S Hughes, VW Bhadra, S Catterall, C Cole, JE Frisken, WR Hall-Wilton, R Khakzad, M Menary, S CA ZEUS Collaboration TI Measurement of the proton structure function F-2 at very low Q(2) at HERA SO PHYSICS LETTERS B LA English DT Article ID DEEP-INELASTIC SCATTERING; LUND MONTE-CARLO; LOW-X; JET FRAGMENTATION; E+E-PHYSICS; GENERATOR; ENERGY; MODEL; QCD; EP AB A measurement of the proton structure function F-2(x, Q(2)) is presented in the kinematic range 0.045 GeV2 < Q(2) < 0.65 GeV2 and 6 . 10(-7) < x < 1 . 10(-3). The results were obtained using a data sample corresponding to an integrated luminosity of 3.9 pb(-1) in e(+)p reactions recorded with the ZEUS detector at HERA. Information from a silicon-strip tracking detector, installed in front of the small electromagnetic calorimeter used to measure the energy of the final-state positron at small scattering angles, together with an enhanced simulation of the hadronic final state, has permitted the extension of the kinematic range beyond that of previous measurements. The uncertainties in F-2 are typically less than 4%. At the low Q(2) values of the present measurement, the rise of F-2 at low x is slower than observed in HERA data at higher Q(2) and can be described by Regge theory with a constant logarithmic slope partial derivative lnF(2)/partial derivative ln(1/x). The dependence of F-2 on Q(2) is stronger than at higher Q(2) values, approaching, at the lowest Q(2) values of this measurement, a region where F-2 becomes nearly proportional to Q(2). (C) 2000 Elsevier Science B.V. All rights reserved. C1 Argonne Natl Lab, Argonne, IL 60439 USA. Univ Bologna, Bologna, Italy. Ist Nazl Fis Nucl, I-40126 Bologna, Italy. Univ Bonn, Inst Physiol, D-5300 Bonn, Germany. Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England. Univ Calabria, Dept Phys, I-87036 Cosenza, Italy. Ist Nazl Fis Nucl, I-87036 Cosenza, Italy. Chonnam Natl Univ, Kwangju, South Korea. Columbia Univ, Nevis Labs, Irvington, NY USA. Inst Nucl Phys, Krakow, Poland. Acad Min & Met, Fac Phys & Nucl Tech, Krakow, Poland. Jagiellonian Univ, Krakow, Poland. DESY, D-2000 Hamburg, Germany. DESY, Zeuthen, Germany. Univ Florence, Florence, Italy. Ist Nazl Fis Nucl, I-50125 Florence, Italy. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Freiburg, Fak Phys, D-7800 Freiburg, Germany. Univ Glasgow, Dept Phys & Astron, Glasgow, Lanark, Scotland. Univ Hamburg, Inst Exp Phys 1, Hamburg, Germany. Univ Hamburg, Inst Expt Phys 2, D-2000 Hamburg, Germany. Univ London Imperial Coll Sci Technol & Med, High Energy Nucl Phys Grp, London, England. Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA. Forschungszentrum Julich, Inst Kernphys, D-5170 Julich, Germany. KEK, Inst Particle & Nucl Studies, Tsukuba, Ibaraki, Japan. Korea Univ, Seoul 136701, South Korea. Kyungpook Natl Univ, Taegu 702701, South Korea. Univ Autonoma Madrid, Dept Fis Teor, Madrid, Spain. McGill Univ, Dept Phys, Montreal, PQ H3A 2T5, Canada. Meiji Gakuin Univ, Fac Gen Educ, Yokohama, Kanagawa, Japan. Moscow Phys Engn Inst, Moscow, Russia. Moscow MV Lomonosov State Univ, Inst Nucl Phys, Moscow, Russia. NIKHEF H, NL-1009 DB Amsterdam, Netherlands. Univ Amsterdam, NL-1009 DB Amsterdam, Netherlands. Ohio State Univ, Dept Phys, Columbus, OH 43210 USA. Univ Padua, Dipartimento Fis, Padua, Italy. Ist Nazl Fis Nucl, Padua, Italy. Penn State Univ, Dept Phys, University Pk, PA 16802 USA. Polytech Univ, Sagamihara, Kanagawa, Japan. Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy. Ist Nazl Fis Nucl, I-00185 Rome, Italy. Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England. Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA. Univ Siegen, Fachbereich Phys, D-5900 Siegen, Germany. Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, IL-69978 Tel Aviv, Israel. Univ Tokyo, Dept Phys, Tokyo 113, Japan. Tokyo Metropolitan Univ, Dept Phys, Tokyo, Japan. Univ Turin, Dipartimento Fis Sperimentale, Turin, Italy. Ist Nazl Fis Nucl, I-10125 Turin, Italy. Univ Turin, Fac Sci 2, Alessandria, Italy. Ist Nazl Fis Nucl, Alessandria, Italy. Univ Toronto, Dept Phys, Toronto, ON, Canada. UCL, Dept Phys & Astron, London, England. Warsaw Univ, Inst Phys Expt, Warsaw, Poland. Inst Nucl Studies, PL-00681 Warsaw, Poland. Weizmann Inst Sci, Dept Particle Phys, IL-76100 Rehovot, Israel. Univ Wisconsin, Dept Phys, Madison, WI 53706 USA. Yale Univ, Dept Phys, New Haven, CT 06520 USA. York Univ, Dept Phys, Toronto, ON M3J 2R7, Canada. Univ Hamburg, Hamburg, Germany. RP Breitweg, J (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. RI De Pasquale, Salvatore/B-9165-2008; Wing, Matthew/C-2169-2008; Wiggers, Leo/B-5218-2015; Tassi, Enrico/K-3958-2015; Gladilin, Leonid/B-5226-2011; Morandin, Mauro/A-3308-2016; Solomin, Anatoly/C-3072-2016; Bashkirov, Vladimir/A-4818-2008; Golubkov, Yury/E-1643-2012; Proskuryakov, Alexander/J-6166-2012; Dementiev, Roman/K-7201-2012; Katz, Uli/E-1925-2013; Suchkov, Sergey/M-6671-2015; dusini, stefano/J-3686-2012; Goncalo, Ricardo/M-3153-2016; Doyle, Anthony/C-5889-2009; OI De Pasquale, Salvatore/0000-0001-9236-0748; Wiggers, Leo/0000-0003-1060-0520; Gladilin, Leonid/0000-0001-9422-8636; Morandin, Mauro/0000-0003-4708-4240; Katz, Uli/0000-0002-7063-4418; dusini, stefano/0000-0002-1128-0664; Goncalo, Ricardo/0000-0002-3826-3442; Bailey, David C/0000-0002-7970-7839; Kasemann, Matthias/0000-0002-0429-2448; Doyle, Anthony/0000-0001-6322-6195; Arneodo, Michele/0000-0002-7790-7132; Abbiendi, Giovanni/0000-0003-4499-7562 NR 51 TC 192 Z9 193 U1 0 U2 8 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 AUG 10 PY 2000 VL 487 IS 1-2 BP 53 EP 73 DI 10.1016/S0370-2693(00)00793-0 PG 21 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 345CN UT WOS:000088798000007 ER PT J AU Mughabghab, SF Dunford, CL AF Mughabghab, SF Dunford, CL TI A dipole-quadrupole interaction term in E1 photon transitions SO PHYSICS LETTERS B LA English DT Article DE E1 photon strength functions; deduced generalized fermi liquid model for spherical and deformed nuclides; temperature dependence of GDR ID NEUTRON-CAPTURE; RESONANCE; NUCLEI; MODEL; TEMPERATURE; COLLAPSE; DENSITY; SN-120; PB-208; STATES AB Evidence is presented for a dipole-quadrupole interaction term in the primary El transitions of average resonance capture data. This evidence is obtained by testing a proposed generalized Landau Fermi liquid model for spherical and deformed nuclei, which includes the effect of the dipole-quadrupole interaction. The present formulation succeeded in unifying the description of the El photon strength functions for spherical and deformed nuclei. The Landau-Migdal interaction constants, as well as the effective nucleon mass, are determined as F-0(1) = 1.49 +/- 0.08, F-1 = 0.12 +/- 0.21, and m*/m = 1.04 +/- 0.07. The temperature dependence of the damping width of the giant dipole resonance is investigated within a generalized Fermi liquid model and its predictions are compared with experimental data, as well as microscopic calculations. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Brookhaven Natl Lab, Natl Nucl Data Ctr, Upton, NY 11973 USA. RP Mughabghab, SF (reprint author), Brookhaven Natl Lab, Natl Nucl Data Ctr, Upton, NY 11973 USA. NR 43 TC 47 Z9 49 U1 2 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 AUG 10 PY 2000 VL 487 IS 1-2 BP 155 EP 164 DI 10.1016/S0370-2693(00)00792-9 PG 10 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 345CN UT WOS:000088798000020 ER PT J AU Xin, JX Hyman, JM AF Xin, JX Hyman, JM TI Stability, relaxation, and oscillation of biodegradation fronts SO SIAM JOURNAL ON APPLIED MATHEMATICS LA English DT Article DE biodegradation; fronts; stability; growth; oscillation ID OXYGEN-LIMITED BIODEGRADATION; MICROBIAL-GROWTH; POROUS-MEDIA; TRANSPORT; BIOREMEDIATION; GROUNDWATER; SIMULATION; DYNAMICS; MODEL AB We study the stability and oscillation of traveling fronts in a three-component, advection-reaction biodegradation model. The three components are pollutant, nutrient, and bacteria concentrations. Under an explicit condition on the biomass growth and decay coefficients, we derive reduced, two-component, semilinear hyperbolic models through a relaxation procedure, during which biomass is slaved to pollutant and nutrient concentration variables. The reduced two-component models resemble the Broadwell model of the discrete velocity gas. The traveling fronts of the reduced system are explicit and are expressed in terms of hyperbolic tangent function in the nutrient-deficient regime. We perform energy estimates to prove the asymptotic stability of these fronts under explicit conditions on the coefficients in the system. In the small damping limit, we carry out Wentzel-Kramers-Brillouin (WKB) analysis on front perturbations and show that fronts are always stable in the two-component models. We extend the WKB analysis to derive amplitude equations for front perturbations in the original three-component model. Because of the bacteria kinetics, we nd two asymptotic regimes where perturbation amplitudes grow or oscillate in time. We perform numerical simulations to illustrate the predictions of the WKB theory. C1 Univ Texas, Texas Inst Computat & Appl Math, Dept Math, Austin, TX 78712 USA. Univ Calif Los Alamos Natl Lab, Grp T7, Los Alamos, NM 87545 USA. Univ Arizona, Tucson, AZ 85721 USA. RP Xin, JX (reprint author), Univ Texas, Texas Inst Computat & Appl Math, Dept Math, Austin, TX 78712 USA. NR 24 TC 7 Z9 7 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 USA SN 0036-1399 J9 SIAM J APPL MATH JI SIAM J. Appl. Math. PD AUG 10 PY 2000 VL 61 IS 2 BP 472 EP 505 DI 10.1137/S003613999732696X PG 34 WC Mathematics, Applied SC Mathematics GA 348WC UT WOS:000089008600005 ER PT J AU Wang, WK Qiu, SR Corbitt, B Riggs, ST Yarmoff, JA AF Wang, WK Qiu, SR Corbitt, B Riggs, ST Yarmoff, JA TI Chemisorption of iodine on In- and Sb-terminated InSb(001) SO SURFACE SCIENCE LA English DT Article DE chemisorption; etching; indium antimonide; iodine; low energy electron diffraction (LEED); soft X-ray photoelectron spectroscopy; surface chemical reaction; surface roughening ID SCANNING-TUNNELING-MICROSCOPY; ROOM-TEMPERATURE; 001 SURFACES; GAAS 110; ADSORPTION; I-2; PASSIVATION; C(8X2); LAYER; CL-2 AB The chemisorption of I-2 on the In-terminated InSb(001)-c(8 x 2) and Sb-terminated InSb(001)-c(4 x 4) surfaces was investigated with synchrotron-based soft X-ray photoelectron spectroscopy and low-energy electron diffraction. For both terminations, the predominant species formed is InI2, and the surfaces become disordered. Further analysis suggests that iodine adsorption induces In to migrate from the bulk up to the surface. These results are compared to results for similar systems. It is suggested that the ability of InI2 to form on the surface is critical in determining the reaction pathway. InI2 is readily formed because of the relatively large lattice spacing and the relatively weak In-Sb bond strength, as compared to other III-V materials. Thus, the reaction of I-2 with InSb can proceed more completely, and the surface product distribution more closely reflects the bulk chemical thermodynamics. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Yarmoff, JA (reprint author), Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA. NR 26 TC 4 Z9 4 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD AUG 10 PY 2000 VL 462 IS 1-3 BP 211 EP 221 DI 10.1016/S0039-6028(00)00621-X PG 11 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 348DR UT WOS:000088970500026 ER PT J AU Bluhm, H Inoue, T Salmeron, M AF Bluhm, H Inoue, T Salmeron, M TI Formation of dipole-oriented water films on mica substrates at ambient conditions SO SURFACE SCIENCE LA English DT Letter DE atomic force microscopy; mica; surface electronic phenomena (work function; surface potential, surface states, etc.); water ID POLARIZATION FORCE MICROSCOPY; ICE FILMS; SURFACE; ADSORPTION AB We present results of surface potential measurements of ice and water films condensed on mica surfaces in the temperature range of -26 degrees C to 19 degrees C. These results indicate the growth of dipole-oriented ice and water films giving rise to electrical potentials of up to -50V at the surface. We propose that this is due to the growth of surface induced ferroelectric ice. The results are significant because the films are in equilibrium with the vapor at temperatures that are commonly present on earth and ill the atmosphere. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Sci Mat, Berkeley, CA 94720 USA. Minist Int Trade & Ind, Electrotech Lab, Tsukuba, Ibaraki 305, Japan. RP Salmeron, M (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Sci Mat, Berkeley, CA 94720 USA. NR 20 TC 36 Z9 36 U1 1 U2 14 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD AUG 10 PY 2000 VL 462 IS 1-3 BP L599 EP L602 DI 10.1016/S0039-6028(00)00595-1 PG 4 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 348DR UT WOS:000088970500004 ER PT J AU Lyman, PF Sakata, O Marasco, DL Lee, TL Breneman, KD Keane, DT Bedzyk, MJ AF Lyman, PF Sakata, O Marasco, DL Lee, TL Breneman, KD Keane, DT Bedzyk, MJ TI Structure of a passivated Ge surface prepared from aqueous solution SO SURFACE SCIENCE LA English DT Letter DE chalcogens; chemisorption; compound formation; crystalline-amorphous interfaces; germanium; surface chemical reaction; surface structure, morphology, roughness, and topography; x-ray standing waves ID TELLURIUM; SULFUR; INP AB The structure of a passivating sulfide layer on Ge(001) was studied using X-ray standing waves and X-ray fluorescence. The sulfide layer was formed by reacting clean Ge substrates in (NH4)(2)S solutions of various concentrations at 80 degrees C. For each treatment, a sulfide layer containing approximately two to three monolayers (ML) of S was formed on the surface, and an ordered structure was found at the interface that contained approximately 0.4 ML of S. Our results suggest the rapid formation of a glassy GeSx layer containing 1.5-2.5 ML S residing atop a partially ordered interfacial layer of bridge-bonded S. The passivating reaction appears to be self-limited to 2-3 ML at this reaction temperature. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA. Northwestern Univ, Mat Res Ctr, Evanston, IL 60208 USA. Univ Wisconsin, Dept Phys, Milwaukee, WI 53201 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Bedzyk, MJ (reprint author), Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA. RI Bedzyk, Michael/B-7503-2009; SAKATA, Osami/H-2621-2011; Bedzyk, Michael/K-6903-2013 NR 20 TC 32 Z9 32 U1 1 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD AUG 10 PY 2000 VL 462 IS 1-3 BP L594 EP L598 DI 10.1016/S0039-6028(00)00508-2 PG 5 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA 348DR UT WOS:000088970500003 ER PT J AU Wullschleger, SD Wilson, KB Hanson, PJ AF Wullschleger, SD Wilson, KB Hanson, PJ TI Environmental control of whole-plant transpiration, canopy conductance and estimates of the decoupling coefficient for large red maple trees SO AGRICULTURAL AND FOREST METEOROLOGY LA English DT Article DE energy balance; forest water use; sap velocity; stomatal control; thermal dissipation probes ID XYLEM SAP FLOW; BROAD-LEAVED FOREST; SURFACE CONDUCTANCE; STAND TRANSPIRATION; PINE FOREST; WATER-USE; FLUX; LEAF; EVAPORATION; DEPENDENCE AB There is a strong need to extend whole-tree measurements of sap flow into broad-leaved forests where characteristics of stand structure, surface roughness, leaf dimension, and aerodynamic and canopy conductance may interact to partially decouple the canopy from the atmosphere. The implications partial decoupling to understanding the environmental control of canopy transpiration and to the modeling of forest water use are many. Therefore, thermal dissipation probes were used over a three-month period (June through August, 1997) to quantify day-to-day and tree-to-tree variation in whole-tree sap Row (Q) for 12 red maple (Acer rubrum L.) trees growing in an upland oak forest of eastern Tennessee. Whole-tree Q was calculated as the product of measured sap velocity, sapwood area and the fraction of sapwood functional in water transport. Daily canopy transpiration (E-c) was calculated from whole-tree Q and projected crown area, whereas average daily conductance (g(c)) was derived by inverting the Penman-Monteith equation. Maximum Q averaged 73 kg per tree per day and varied between 45 and 160 kg per day for trees that ranged in stem diameter (DBH) from 17 to 35 cm, and from 19 to 26 m in height. Canopy transpiration peaked at 3.0 mm per day in early July and averaged 1.5 mm per day over the 3-month measurement period. Tree-to-toe variability for E-c was high. Maximum rates of E-c varied from 1.9 mm per day for the tree with the smallest projected crown area to 5.7 mm per day for one of the largest trees. Day-to-day variation in E-c was a function of daily differences in net radiation (R-n) and atmospheric humidity deficit (delta(e)). Increases in daily R-n and delta(e) led to linear increases in canopy transpiration and there was no indication that a plateau-style relationship existed between E-c and average daily delta(e). Mean daily g(c) ranged from 1.4 to 6.7 mm s(-1), and averaged 3.4 mm s(-1) across the 12 study trees. Some of the tree-to-tree variation observed for E-c and g(c) was related to the fact that not all trees occupied the same vertical position within the stand. Variation in estimates of the daily decoupling coefficient (0 less than or equal to Omega less than or equal to 1) was also considerable and for individual trees the seasonally-averaged Omega varied from 0.12 to 0.37, and averaged 0.23 for the 12 study trees. An Omega of this magnitude indicates that red maple canopies are partially decoupled from the atmosphere and suggests that significant vertical gradients of air temperature and delta(e) from the canopy surface to the bulk air several meters above the canopy are possible. Model analysis of hourly data indicated that simulated surface temperatures in mid-July were 3.6-5.8 degrees C higher than above-canopy reference temperatures, and delta(e) at the canopy surface was 0.3 kPa higher than that of the bulk atmosphere. These calculations were partially supported by leaf-level measurements taken on one of the trees from a 20-m canopy-access tower. The implications of this partial decoupling to understanding and modeling the environmental control of canopy transpiration are discussed. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. NOAA, Air Res Lab, Atmospher Turbulence & Diffus Div, Oak Ridge, TN 37831 USA. RP Wullschleger, SD (reprint author), Oak Ridge Natl Lab, Div Environm Sci, POB 2008, Oak Ridge, TN 37831 USA. RI Hanson, Paul J./D-8069-2011; Wullschleger, Stan/B-8297-2012 OI Hanson, Paul J./0000-0001-7293-3561; Wullschleger, Stan/0000-0002-9869-0446 NR 36 TC 69 Z9 90 U1 2 U2 38 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-1923 J9 AGR FOREST METEOROL JI Agric. For. Meteorol. PD AUG 8 PY 2000 VL 104 IS 2 BP 157 EP 168 DI 10.1016/S0168-1923(00)00152-0 PG 12 WC Agronomy; Forestry; Meteorology & Atmospheric Sciences SC Agriculture; Forestry; Meteorology & Atmospheric Sciences GA 339XL UT WOS:000088503100006 ER PT J AU Krishnan, VV Sukumar, M Gierasch, LM Cosman, M AF Krishnan, VV Sukumar, M Gierasch, LM Cosman, M TI Dynamics of cellular retinoic acid binding protein I on multiple time scales with implications for ligand binding SO BIOCHEMISTRY LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; OPTIMAL SAMPLING STRATEGIES; N-15 NMR RELAXATION; FATTY-ACID; BACKBONE DYNAMICS; LIPID-BINDING; CRYSTAL-STRUCTURE; EXCHANGE-RATES; SPIN RELAXATION; AMIDE PROTONS AB Cellular retinoic acid binding protein I (CRABPI) belongs to the family of intracellular lipid binding proteins (iLBPs), all of which bind a hydrophobic ligand within an internal cavity. The structures of several iLBPs reveal minimal structural differences between the apo (ligand-free) and hole (ligand-bound) forms, suggesting that dynamics must play an important role in the ligand recognition and binding processes. Here, a variety of nuclear magnetic resonance (NMR) spectroscopy methods were used to systematically study the dynamics of both apo and hole CRABPI at various time scales. Translational and rotational diffusion constant measurements were used to study the overall motions of the proteins. Both apo and hole forms of CRABPI tend to self-associate at high (1.2 mM) concentrations, while at low concentrations (0.2 mM), they are predominantly monomeric. Rapid amide exchange rate and laboratory frame relaxation rate measurements at two spectrometer field strengths (500 and 600 MHz) were used to probe the internal motions of the individual residues. Several residues in the apo form, notably within the ligand recognition region, exhibit millisecond time scale motions that are significantly arrested in the hole form. In contrast, no significant differences in the high-frequency motions were observed between the two forms. These results provide direct experimental evidence for dynamics-induced ligand recognition and binding at a specifically defined time scale. They also exemplify the importance of dynamics in providing a more comprehensive understanding of how a protein functions. C1 Univ Calif Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, Livermore, CA 94551 USA. Univ Massachusetts, Dept Chem, Amherst, MA 01003 USA. RP Krishnan, VV (reprint author), Univ Calif Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, 7000 East Ave,L-448, Livermore, CA 94551 USA. RI Gierasch, Lila/D-1494-2009; Krishnan, Krish/A-6859-2010 FU NIGMS NIH HHS [GM27616] NR 80 TC 35 Z9 36 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD AUG 8 PY 2000 VL 39 IS 31 BP 9119 EP 9129 DI 10.1021/bi0002961 PG 11 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA 341MC UT WOS:000088593300008 PM 10924105 ER PT J AU Choi, H Bise, RT Hoops, AA Neumark, DM AF Choi, H Bise, RT Hoops, AA Neumark, DM TI Photodissociation dynamics of the triiodide anion (I-3(-)) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID FEMTOSECOND PHOTOELECTRON-SPECTROSCOPY; STIMULATED RAMAN-SCATTERING; ULTRAFAST PHOTODISSOCIATION; VIBRATIONAL-RELAXATION; GEMINATE RECOMBINATION; MOLECULAR-DYNAMICS; I-2(-) ANION; FAST BEAM; EXCITATION; IONS AB The spectroscopy and dissociation dynamics of I-3(-) were investigated using fast beam photofragment translational spectroscopy. The photofragment yield of I-3(-) from 420 to 240 nm was measured, yielding two broadbands at the same energies as in the absorption spectrum of I-3(-) in solution. Photodissociation dynamics measurements performed with two-particle time-and-position sensitive detection revealed two product mass channels having photofragment mass ratios of 1:2 and 1:1. Both channels were seen at all photolysis wavelengths. Translational energy distributions show that the 1:2 products are from a combination of I(P-2(3/2))+I-2(-) and I*(P-2(1/2))+I-2(-). The 1:1 mass channel is from symmetric three-body dissociation to I-+2I. (C) 2000 American Institute of Physics. [S0021-9606(00)00730-3]. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA. RP Choi, H (reprint author), Univ Calif Los Angeles, Dept Chem & Biochem, 405 Hilgard Ave, Los Angeles, CA 90095 USA. RI Neumark, Daniel/B-9551-2009 OI Neumark, Daniel/0000-0002-3762-9473 NR 45 TC 16 Z9 16 U1 0 U2 7 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 8 PY 2000 VL 113 IS 6 BP 2255 EP 2262 AR PII [S0021-9606(00)00730-3] DI 10.1063/1.482040 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 344XT UT WOS:000088786900027 ER PT J AU Reichardt, TA Di Teodoro, F Farrow, RL Roy, S Lucht, RP AF Reichardt, TA Di Teodoro, F Farrow, RL Roy, S Lucht, RP TI Collisional dependence of polarization spectroscopy with a picosecond laser SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID DEGENERATE 4-WAVE-MIXING SPECTROSCOPY; QUANTITATIVE CONCENTRATION MEASUREMENTS; OH; FLAMES; INTENSITIES; TRANSITIONS; SATURATION; SPECTRA AB The collisional dependence of polarization spectroscopy (PS) with a picosecond-pulse laser is investigated theoretically with a perturbative treatment and experimentally by probing hydroxyl (OH) in a flow cell with a buffer gas of argon. Using a frequency-doubled distributed-feedback dye laser (DFDL), the PS signal strength is monitored as a function of pressure using a nonsaturating pump beam and a saturating pump beam. The collisional dependence of the PS signal is found to decrease significantly with a saturating pump beam. Increasing the flow-cell pressure by a factor of 50 (from 10 torr to 500 torr), the PS signal strength produced with a nonsaturating pump beam decreases by a factor of 18 while that produced with a saturating pump decreases by only a factor of 3. A third-order perturbative (weak-field) approach is used to develop an analytical expression for the PS signal generated by single-mode, exponentially decaying laser pulses. This expression correctly predicts the experimental results acquired with the nonsaturating pump beam. The analytical solution is used to examine the effects of pulse length on the collisional dependence of the weak-field PS signal strength. Results are also presented for a numerical simulation of the time-dependent density matrix equations for the high intensity case. (C) 2000 American Institute of Physics. [S0021-9606(00)01430-6]. C1 Sandia Natl Labs, Combust Res Facil, Livermore, CA 94551 USA. Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA. RP Reichardt, TA (reprint author), Sandia Natl Labs, Combust Res Facil, POB 969,Mail Stop 9055, Livermore, CA 94551 USA. NR 35 TC 24 Z9 24 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 8 PY 2000 VL 113 IS 6 BP 2263 EP 2269 AR PII [S0021-9606(00)01430-6] DI 10.1063/1.482041 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 344XT UT WOS:000088786900028 ER PT J AU Barrena, E Ocal, C Salmeron, M AF Barrena, E Ocal, C Salmeron, M TI Molecular packing changes of alkanethiols monolayers on Au(111) under applied pressure SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID SELF-ASSEMBLED MONOLAYERS; ALKYLSILANE LUBRICANT FILMS; ATOMIC-FORCE MICROSCOPY; MECHANICAL RELAXATION; FRICTION; COMPRESSION; SURFACE AB A study of the changes of molecular packing in self-assembled monolayers of alkylthiols on Au(111) induced by external pressure is presented. Atomic force microscopy (AFM) is used to apply pressure and to measure the height of islands of alkanethiols partially covering the gold surface. The islands are made of ordered straight chain alkylthiol molecules tilted from the surface normal. Their height was found to decrease in a stepwise manner as a function of the load applied by the tip. Simultaneous stepwise increases in friction force were observed. A simple geometrical model involving the interlocking of alkyl chains at specific molecular tilt angles can explain the observations. According to the model, tilts in both the nearest neighbor and the next-nearest neighbor directions are necessary. (C) 2000 American Institute of Physics. [S0021-9606(00)70530-7]. C1 CSIC, Inst Ciencia Mat Madrid, Dept Intercaras & Crecomiento, Madrid 28049, Spain. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Barrena, E (reprint author), CSIC, Inst Ciencia Mat Madrid, Dept Intercaras & Crecomiento, Madrid 28049, Spain. RI Ocal, Carmen/G-8590-2013; Barrena, Esther/B-7683-2014 OI Ocal, Carmen/0000-0001-8790-8844; Barrena, Esther/0000-0001-9163-2959 NR 22 TC 75 Z9 75 U1 1 U2 10 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 8 PY 2000 VL 113 IS 6 BP 2413 EP 2418 AR PII [S0021-9606(00)70530-7] DI 10.1063/1.482057 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 344XT UT WOS:000088786900044 ER PT J AU Schenkel, T Schlatholter, T Newman, MW Machicoane, GA McDonald, JW Hamza, AV AF Schenkel, T Schlatholter, T Newman, MW Machicoane, GA McDonald, JW Hamza, AV TI Influence of hydrogen on the stability of positively charged silicon dioxide clusters SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MASS-SPECTROMETRY; ION EMISSION; SLOW; SURFACES; TIME; SIO2 AB Spectra of positively charged secondary ions from thermally grown SiO2 films were recorded in a time-of-flight secondary ion mass spectrometry scheme. Ablation of cluster ions was induced by the impact of slow (4 keV/u) Au69+ projectiles. The intensities of SixOyHz+, (x=1-22, y=1-44, z=0-7) clusters are found to depend sensitively on the oxygen to silicon ratio and also on the hydrogen content. We find that oxygen rich clusters, y=2x+1, and, in one case, y=2x+2, can be stabilized by the incorporation of two additional hydrogen atoms in the cluster. (C) 2000 American Institute of Physics. [S0021-9606(00)70630-1]. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ Groningen, KVI Atom Phys, NL-9747 AA Groningen, Netherlands. RP Univ Calif Berkeley, Lawrence Berkeley Lab, 1 Cyclotron Rd,MS 5-119, Berkeley, CA 94720 USA. EM T_Schenkel@LBL.gov RI Schlatholter, Thomas/A-3407-2011 OI Schlatholter, Thomas/0000-0001-9923-172X NR 19 TC 19 Z9 19 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 AUG 8 PY 2000 VL 113 IS 6 BP 2419 EP 2422 AR PII [S0021-9606(00)70630-1] DI 10.1063/1.482058 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 344XT UT WOS:000088786900045 ER PT J AU Duncan, DC Whitten, DG AF Duncan, DC Whitten, DG TI H-1 NMR investigation of the composition, structure, and dynamics of cholesterol-stilbene tethered dyad organogels SO LANGMUIR LA English DT Article ID SUGAR-INTEGRATED GELATORS; SMALL-ANGLE-SCATTERING; LOW-MOLECULAR-MASS; ORGANIC-SOLVENTS; CARBOHYDRATE AMPHIPHILES; GELATION ABILITY; BUILDING-BLOCKS; GELS; FLUIDS; SPECTROSCOPY AB The self-assembly of stilbene-cholesterol tethered dyads into fibrous networked structures induces the thermoreversible gelation of several classes of organic solvents. Herein, the gel and solution phases of the gelator, p-alpha-cholesteryl-p'-octoxystilbenoate (1), are investigated in 1-butanol-d(10) (gel forming) and cyclohexane-d(12) (nongel forming) by variable-temperature H-1 NMR spectra, T-1, and T-2 relaxation measurements. All of the NMR data are consistent with detection of 1 in the gel phase by a fast exchange on the NMR time scale between residual 1 dissolved in the gel liquid and 1 in a "mobile" (NMR detectable) gel solid. This conclusion is significant since in previous NMR studies on other gel systems detection of gelator in the gel phase was considered only within "mobile" regions of the gel solid. The decrease in peak integrals of 1 in the gel phase by declining temperatures reflects a convolution of (1) a decrease in concentration of 1 dissolved within the gel liquid as it condenses onto the gel solid strands and (2) a transition in the gel solid from "mobile" to more "rigid" (NMR silent) regions. The relaxation measurements provide evidence for the existence of a sol aggregate of 1 in 1-butanol-d(10) observed above the temperature required for gel formation, T-g. This aggregate is likely the incipient precursor structure to the gel, but its aggregate length is not yet long enough to nucleate the growth of the interpenetrating solid network required for solvent gelation. The absence of regioselectivity in the temperature dependence of the 1H relaxation rate behavior of 1 along the gel --> sol --> solution trajectory implies involvement of both the stilbene and cholesterol substructures of 1 in forming the sol and gel aggregates. However, one caveat is that, in the gel phase, the internal phenyl ring of the stilbene moiety of 1 may have greater mobility than in other regions of 1. C1 Univ Calif Los Alamos Natl Lab, Ctr Mat Sci, Ctr Mat Sci & Technol, Los Alamos, NM 87501 USA. RP Whitten, DG (reprint author), Univ Calif Los Alamos Natl Lab, Ctr Mat Sci, Ctr Mat Sci & Technol, Los Alamos, NM 87501 USA. NR 45 TC 101 Z9 101 U1 1 U2 21 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0743-7463 J9 LANGMUIR JI Langmuir PD AUG 8 PY 2000 VL 16 IS 16 BP 6445 EP 6452 DI 10.1021/la0001631 PG 8 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA 341MG UT WOS:000088593700013 ER PT J AU Fukui, K Sumpter, BG Barnes, MD Noid, DW AF Fukui, K Sumpter, BG Barnes, MD Noid, DW TI Atomistic dynamics of nanoscale polymer particles SO MACROMOLECULES LA English DT Article ID MOLECULAR-DYNAMICS; BLEND MICROPARTICLES; QUANTUM DROPS; POLYETHYLENE; SIMULATION; NANOPARTICLES; DIFFUSION; BEHAVIOR; LATTICE; MELTS AB Full classical molecular dynamics was used to study the atomistic details of nanometer scale polymer particles. Using a previously developed efficient molecular dynamics-based method for the generation of polymeric nanoparticles, we model polyethylene (PE) with up to 120 000 atoms, poly(ethylproplyene) (PEP), atactic polypropylene (aPP), and polyisobutylene (PIB) with up to 12 000 backbone atoms. A variety of characteristics and thermodynamical properties of those nanoscale particles are obtained to interpret the properties of a fine polymer particle distinguished from the bulk solid phase. The molecular volume and total energy as a function of temperature are calculated to predict the melting point, glass transition temperature, and heat capacity for the nanoscale particles. C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RP Noid, DW (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 28 TC 11 Z9 11 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD AUG 8 PY 2000 VL 33 IS 16 BP 5982 EP 5987 DI 10.1021/ma000045k PG 6 WC Polymer Science SC Polymer Science GA 343FU UT WOS:000088691700036 ER PT J AU Genzer, J Sivaniah, E Kramer, EJ Wang, JG Xiang, ML Char, K Ober, CK Bubeck, RA Fischer, DA Graupe, M Colorado, R Shmakova, OE Lee, TR AF Genzer, J Sivaniah, E Kramer, EJ Wang, JG Xiang, ML Char, K Ober, CK Bubeck, RA Fischer, DA Graupe, M Colorado, R Shmakova, OE Lee, TR TI Molecular orientation of single and two-armed monodendron semifluorinated chains on "soft" and "hard" surfaces studied using NEXAFS SO MACROMOLECULES LA English DT Article ID SELF-ASSEMBLED MONOLAYERS; BLOCK-COPOLYMERS; ALKANETHIOLATE MONOLAYERS; SIDE-CHAINS; THIN-FILMS; X-RAY; SPECTROSCOPY; POLYMERS AB Near-edge absorption fine structure (NEXAFS) measurements are used to probe the molecular orientation of semifluorinated (SF) mesogens, -(CH2)(x)(CF2)(y)F, which are attached to (i) the isoprene backbone of polyisoprene or a styrene-isoprene diblock copolymer ("soft" substrate), and (ii) a Au-covered solid substrate via a thiol link ("hard" substrate). The SF groups on both surfaces are oriented and on average are tilted from the sample normal. The tilt angle, [tau(F)-helix], of the fluorinated part of the SF group on each substrate is determined exclusively by the combination of x and y, increasing with increasing x and with decreasing y. Moreover, [tau(F)-helix] is found to be independent of the surface topology (flat surfaces vs surfaces covered with holes or islands of the copolymer), casting solvent, and the architecture of the SF group (single vs 2-armed monodendron). Comparing the orientation of the SF groups on both substrates reveals that [tau(F)-helix] is approximately 14 degrees higher on the "soft" substrate. C1 N Carolina State Univ, Dept Chem Engn, Raleigh, NC 27695 USA. Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA. Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14853 USA. Michigan Mol Inst, Midland, MI 48640 USA. Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA. Natl Inst Stand & Technol, Mat Sci & Engn Lab, Gaithersburg, MD 20899 USA. Univ Houston, Dept Chem, Houston, TX 77204 USA. Univ Calif Santa Barbara, Dept Chem Engn, Santa Barbara, CA 93106 USA. RP Genzer, J (reprint author), N Carolina State Univ, Dept Chem Engn, Raleigh, NC 27695 USA. OI Lee, T. Randall/0000-0001-9584-8861 NR 34 TC 49 Z9 51 U1 2 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD AUG 8 PY 2000 VL 33 IS 16 BP 6068 EP 6077 DI 10.1021/ma991710w PG 10 WC Polymer Science SC Polymer Science GA 343FU UT WOS:000088691700048 ER PT J AU Xiang, ML Li, XF Ober, CK Char, K Genzer, J Sivaniah, E Kramer, EJ Fischer, DA AF Xiang, ML Li, XF Ober, CK Char, K Genzer, J Sivaniah, E Kramer, EJ Fischer, DA TI Surface stability in liquid-crystalline block copolymers with semifluorinated monodendron side groups SO MACROMOLECULES LA English DT Article ID DENDRITIC DIBLOCK COPOLYMERS; LOW-ENERGY SURFACES; FLUORINATED POLYSILOXANES; ESTER FUNCTION; SOLID-STATE; POLYMERS; MACROMOLECULES; MONOLAYERS; DENDRIMERS; BEHAVIOR AB Block copolymers with semifluorinated monodendron side groups were synthesized by attachment of a first generation 2- or 3-armed monodendron acid chloride to a hydroxylated poly(styrene-b-1,2/3,4-isoprene). A convergent growth strategy was developed to synthesize the monodendron groups in good yield using an approach that could be extended to higher generation monodendrons. High extents of attachment were achieved despite the steric effects of the bulky monodendron side groups. The resulting polymers formed a smectic B mesophase at room temperature as determined by WAXS data. The transition temperatures, mesophase range, and enthalpy of the smectic B-isotropic transition were all affected by side-group structural factors such as flexible spacer length, mesogen length, and monodendron core. The critical surface tensions of the resulting semifluorinated polymers were as low as similar to 8 mN/m as determined by Zisman analysis. Surface stability of polymer films in a polar liquid environment was strongly dependent on the extent of attachment exhibited by the semifluorinated groups. The monodendron -CF2-helix within 1 nm of the surfaces has a net orientation normal to the surface as measured by near-edge X-ray absorption fine structure (NEXAFS) methods, but the orientational order parameter S-helix is much higher for the 2-armed monodendrons than for the 3-armed monodendrons. In both cases S-helix seems insensitive to monodendron attachment density along the isoprene block. We suggest that packing frustration of the monodendron subunits produces surfaces with spontaneous curvature that differs depending on whether the monodendrons are 2- or 3-armed. The more highly curved surface topology of the 3-armed monodendrons may provide a partial explanation for its decreased orientational order. C1 Cornell Univ, Ithaca, NY 14853 USA. Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA. Univ Calif Santa Barbara, Dept Chem Engn, Santa Barbara, CA 93106 USA. Natl Inst Stand & Technol, Mat Sci & Engn Lab, Gaithersburg, MD 20899 USA. Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. RP Ober, CK (reprint author), Cornell Univ, Bard Hall, Ithaca, NY 14853 USA. NR 43 TC 102 Z9 105 U1 2 U2 23 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD AUG 8 PY 2000 VL 33 IS 16 BP 6106 EP 6119 DI 10.1021/ma992111s PG 14 WC Polymer Science SC Polymer Science GA 343FU UT WOS:000088691700051 ER PT J AU Yim, H Kent, M Matheson, A Ivkov, R Satija, S Majewski, J Smith, GS AF Yim, H Kent, M Matheson, A Ivkov, R Satija, S Majewski, J Smith, GS TI Adsorption of poly(styrenesulfonate) to the air surface of water by neutron reflectivity SO MACROMOLECULES LA English DT Article ID X-RAY REFLECTIVITY; POLY-ELECTROLYTE ADSORPTION; ADSORBED BETA-CASEIN; AIR/WATER INTERFACE; IONIC-STRENGTH; CONCENTRATION PROFILES; POLYSTYRENE SULFONATE; SOLVENT CONDITIONS; AQUEOUS-SOLUTIONS; DENSITY PROFILE AB The adsorption of the strong polyelectrolyte poly(styrenesulfonate) (PSS) to the air surface of dilute aqueous solutions was investigated as a function of molecular weight and salt concentration. Detailed segment profiles of the deuterated polymer were determined by neutron reflection. Surface activity was also examined through surface tension measurements. In general, the segment profiles are composed of a thin layer (10-20 Angstrom thick) of high concentration at the air surface, followed by a distinct second layer of much lower segment concentration that extends to larger depths into the liquid. The high segment density at the air surface is due to a strong surface attraction, arising from the low surface energy of the PSS backbone relative to the surface tension of water. At low salt concentration, the profiles tend toward a single dense layer, suggesting that the chains lie nearly flat at the interface in that limit. The adsorbed amount increases with salt concentration, with a stronger dependence for higher molecular weight chains. The adsorbed amounts at the air/water interface are higher than reported previously for PSS adsorbed onto neutral solid surfaces, consistent with the fact that the air-liquid interface provides a stronger surface attraction. While the trends of adsorbed amount with salt concentration and molecular weight are in good agreement with numerical self-consistent-field lattice calculations, the measured bilayer profiles are rather different from the smoothly decaying theoretical profiles. The surface tensions of the PSS solutions are significantly lowered relative to those of pure salt solutions. Combining the reflectivity and surface tension measurements, an approximately linear relationship is established between the surface pressure and the PSS adsorbed amount. C1 Sandia Natl Labs, Dept 1832, Albuquerque, NM 87185 USA. Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA. Univ Calif Los Alamos Natl Lab, LANSCE, Los Alamos, NM USA. RP Kent, M (reprint author), Sandia Natl Labs, Dept 1832, POB 5800, Albuquerque, NM 87185 USA. RI Lujan Center, LANL/G-4896-2012; Ivkov, Robert/A-3902-2015 OI Ivkov, Robert/0000-0002-2930-5276 NR 54 TC 32 Z9 32 U1 0 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD AUG 8 PY 2000 VL 33 IS 16 BP 6126 EP 6133 DI 10.1021/ma000266q PG 8 WC Polymer Science SC Polymer Science GA 343FU UT WOS:000088691700053 ER PT J AU Lozykowski, HJ Jadwisienczak, WM Han, J Brown, IG AF Lozykowski, HJ Jadwisienczak, WM Han, J Brown, IG TI Luminescence properties of GaN and Al0.14Ga0.86N/GaN superlattice doped with europium SO APPLIED PHYSICS LETTERS LA English DT Article ID VISIBLE CATHODOLUMINESCENCE; ER AB We report the observation of visible photoluminescence and cathodoluminescence of Eu3+ ions implanted in GaN and Al0.14Ga0.86N/GaN superlattice. The sharp characteristic emission lines corresponding to Eu3+ intra-4f(6)-shell transitions are resolved and observed over the temperature range of 7-330 K. The luminescence shows dominant transitions D-5(0)-->F-7(1,2,3) and weaker D-5(0)-->F-7(4,5,6) and D-5(1)-->F-7(1). The luminescence emission is very weakly temperature dependent. The intensity of Eu3+ emission from Al0.14Ga0.86N/GaN superlattice annealed in N-2 is similar to 58% stronger than from Eu3+ in the GaN layer. The Al0.14Ga0.86N/GaN superlattice and GaN epilayers may be suitable as a material for visible optoelectronic devices. (C) 2000 American Institute of Physics. [S0003- 6951(00)01332-2]. C1 Ohio Univ, Stocker Ctr, Sch Elect Engn & Comp Sci, Athens, OH 45701 USA. Ohio Univ, Stocker Ctr, Condensed Matter & Surface Sci Program, Athens, OH 45701 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Lozykowski, HJ (reprint author), Ohio Univ, Stocker Ctr, Sch Elect Engn & Comp Sci, Athens, OH 45701 USA. NR 8 TC 70 Z9 70 U1 2 U2 4 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 7 PY 2000 VL 77 IS 6 BP 767 EP 769 DI 10.1063/1.1306645 PG 3 WC Physics, Applied SC Physics GA 344XX UT WOS:000088787300001 ER PT J AU Murray, SJ Marioni, M Allen, SM O'Handley, RC Lograsso, TA AF Murray, SJ Marioni, M Allen, SM O'Handley, RC Lograsso, TA TI 6% magnetic-field-induced strain by twin-boundary motion in ferromagnetic Ni-Mn-Ga SO APPLIED PHYSICS LETTERS LA English DT Article ID NI2MNGA SINGLE-CRYSTALS; SHAPE-MEMORY; MAGNETOSTRICTION AB Field-induced strains of 6% are reported in ferromagnetic Ni-Mn-Ga martensites at room temperature. The strains are the result of twin boundary motion driven largely by the Zeeman energy difference across the twin boundary. The strain measured parallel to the applied magnetic field is negative in the sample/field geometry used here. The strain saturates in fields of order 400 kA/m and is blocked by a compressive stress of order 2 MPa applied orthogonal to the magnetic field. The strain versus field curves exhibit appreciable hysteresis associated with the motion of the twin boundaries. A simple model accounts quantitatively for the dependence of strain on magnetic field and external stress using as input parameters only measured quantities. (C) 2000 American Institute of Physics. [S0003-6951(00)00832-9]. C1 Iowa State Univ, Dept Energy, Ames Lab, Ames, IA 50014 USA. MIT, Cambridge, MA 02139 USA. RP Murray, SJ (reprint author), Mide Corp, 56 Rogers St, Cambridge, MA 02139 USA. NR 15 TC 831 Z9 870 U1 5 U2 88 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 7 PY 2000 VL 77 IS 6 BP 886 EP 888 AR PII [S0003-6951(00)00832-9] DI 10.1063/1.1306635 PG 3 WC Physics, Applied SC Physics GA 344XX UT WOS:000088787300041 ER PT J AU Forst, CV AF Forst, CV TI Molecular evolution of catalysis SO JOURNAL OF THEORETICAL BIOLOGY LA English DT Article ID RNA SECONDARY STRUCTURES; NATURAL SELF-ORGANIZATION; SEQUENCE STRUCTURE MAPS; NEUTRAL NETWORKS; EXHAUSTIVE ENUMERATION; FINITE POPULATIONS; ERROR THRESHOLDS; HYPERCYCLE; OPTIMIZATION; REPLICATION AB In this paper, we consider the evolutionary dynamics of catalytically active species with a distinct genotype-phenotype relationship. Folding landscapes of RNA molecules serve as a paradigm for this relationship with essential neutral properties. The landscape itself is partitioned by phenotypes (realized as RNA secondary structures). To each genotype (represented as a sequence) a structure is assigned in a unique way. The set of all sequences which map into a particular structure is modeled as a random graph in sequence space (the so-called neutral network). A catalytic network is realized as a random digraph with maximal out-degree two and secondary structures as vertex sets. A population of catalytic RNA molecules shows significantly different behavior compared to a deterministic description: hypercycles are able to co-exist and out-compete a parasite with superior catalytic support. A "switching" between different dynamic organizations of the network can be observed, dynamical stability of hypercyclic organizations against errors and the existence of an error-threshold of catalysis can be reported. (C) 2000 Academic Press. C1 Univ Illinois, Beckman Inst, Urbana, IL 61801 USA. Santa Fe Inst, Santa Fe, NM 87501 USA. RP Forst, CV (reprint author), Univ Calif Los Alamos Natl Lab, Mailstop M888, Los Alamos, NM 87545 USA. NR 72 TC 12 Z9 12 U1 0 U2 1 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND SN 0022-5193 J9 J THEOR BIOL JI J. Theor. Biol. PD AUG 7 PY 2000 VL 205 IS 3 BP 409 EP 431 DI 10.1006/jtbi.2000.2076 PG 23 WC Biology; Mathematical & Computational Biology SC Life Sciences & Biomedicine - Other Topics; Mathematical & Computational Biology GA 334DT UT WOS:000088171000005 PM 10882561 ER PT J AU Yeston, JS Bergman, RG AF Yeston, JS Bergman, RG TI Intramolecular B-H bond activation from a dihydridobis(dimethylpyrazolyl)borate ligand: Formation of a rhodium(III) carbene hydride and a rare example of reverse alpha-hydride migration SO ORGANOMETALLICS LA English DT Article ID COORDINATED CARBON-MONOXIDE; ALKYL COMPLEXES; DERIVATIVES; INSERTION; REACTIVITY; CHEMISTRY; CYCLOPROPANATION; HYDROBORATION; IRIDIUM(I); BEHAVIOR AB The new complex Bp(2)(Me)Rh(CO)(pyridine) (1) has been prepared and reacts with CH3I to yield the novel Rh carbene hydride complex HB(Me(2)pz)(2)Rh(H)-(I)(C5H5N)(C(O)ME) (3), resulting from formal addition of CH3I across the Rh-C bond concomitant with hydride transfer from B to Rh. Thermolysis of 3 induces migration of the Rh hydride to the ct-carbon to give HB(Me(2)pz)(2)Rh(I)(C5H5N)(CH(O)Me) (6), and a crossover study, supports intramolecular mechanisms for both hydride transfer steps. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA. RP Bergman, RG (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. NR 32 TC 29 Z9 29 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD AUG 7 PY 2000 VL 19 IS 16 BP 2947 EP 2949 DI 10.1021/om000365s PG 3 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA 341TJ UT WOS:000088605400003 ER PT J AU Glendenning, NK AF Glendenning, NK TI Lower limit on radius as a function of mass for neutron stars SO PHYSICAL REVIEW LETTERS LA English DT Article ID MILLISECOND PULSAR; RELATIVISTIC STARS; RAY; OSCILLATIONS; EQUATION; MATTER; SYSTEM; STATE AB A model-independent limit on neutron star radius as a function of mass based only on well-accepted principles is derived. We discuss our limit in connection with a recent interpretation of x-ray pulsations from SAX J1808.4-3658 as indicating a strange-star candidate, and show that this object can also be a normal neutron star, though one whose central core has very high density. The most plausible high density phase of hadronic matter, which is also expected to be very compressible, is quark matter. So an alternative to the strange star interpretation of SAX J1808.4-3658 is that it is a hybrid neutron star. C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Inst Nucl & Particle Astrophys, Berkeley, CA 94720 USA. RP Glendenning, NK (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA. NR 26 TC 15 Z9 15 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 AUG 7 PY 2000 VL 85 IS 6 BP 1150 EP 1153 DI 10.1103/PhysRevLett.85.1150 PG 4 WC Physics, Multidisciplinary SC Physics GA 341VN UT WOS:000088611800003 PM 10991499 ER PT J AU Niculescu, I Armstrong, CS Arrington, J Assamagan, KA Baker, OK Beck, DH Bochna, CW Carlini, RD Cha, J Cothran, C Day, DB Dunne, JA Dutta, D Ent, R Frolov, VV Gao, H Geesaman, DF Gueye, PLJ Hinton, W Holt, RJ Jackson, HE Keppel, CE Koltenuk, DM Mack, DJ Meekins, DG Miller, MA Mitchell, JH Mohring, RM Niculescu, G Potterveld, D Price, JW Reinhold, J Segel, RE Stoler, P Tang, L Terburg, BP Van Westrum, D Vulcan, WF Wood, SA Yan, C Zeidman, B AF Niculescu, I Armstrong, CS Arrington, J Assamagan, KA Baker, OK Beck, DH Bochna, CW Carlini, RD Cha, J Cothran, C Day, DB Dunne, JA Dutta, D Ent, R Frolov, VV Gao, H Geesaman, DF Gueye, PLJ Hinton, W Holt, RJ Jackson, HE Keppel, CE Koltenuk, DM Mack, DJ Meekins, DG Miller, MA Mitchell, JH Mohring, RM Niculescu, G Potterveld, D Price, JW Reinhold, J Segel, RE Stoler, P Tang, L Terburg, BP Van Westrum, D Vulcan, WF Wood, SA Yan, C Zeidman, B TI Evidence for valencelike quark-hadron duality SO PHYSICAL REVIEW LETTERS LA English DT Article ID NUCLEON STRUCTURE FUNCTIONS; PARTON DISTRIBUTIONS; SCATTERING; PROTON; RESONANCES; DEUTERIUM; HYDROGEN; BEHAVIOR AB A newly obtained data sample of inclusive electron-nucleon scattering from both hydrogen and deuterium targets is analyzed. These JLab data span the nucleon resonance region up to four-momentum transfers of 5 (GeV/c)(2). The data are found to follow an average scaling curve. The inclusion of low-momentum transfer data yields a scaling curve resembling deep inelastic neutrino-nucleus scattering data, suggesting a sensitivity to valencelike structure only. C1 Hampton Univ, Hampton, VA 23668 USA. Coll William & Mary, Williamsburg, VA 23187 USA. CALTECH, Pasadena, CA 91125 USA. Univ Illinois, Urbana, IL 61801 USA. Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. Univ Virginia, Charlottesville, VA 22901 USA. Northwestern Univ, Evanston, IL 60201 USA. Rensselaer Polytech Inst, Troy, NY 12180 USA. Argonne Natl Lab, Argonne, IL 60439 USA. Univ Maryland, College Pk, MD 20742 USA. Univ Colorado, Boulder, CO 80309 USA. Univ Penn, Philadelphia, PA 19104 USA. RP Niculescu, I (reprint author), Hampton Univ, Hampton, VA 23668 USA. RI Gao, Haiyan/G-2589-2011; Arrington, John/D-1116-2012; Holt, Roy/E-5803-2011; Day, Donal/C-5020-2015 OI Arrington, John/0000-0002-0702-1328; Day, Donal/0000-0001-7126-8934 NR 25 TC 127 Z9 127 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 AUG 7 PY 2000 VL 85 IS 6 BP 1182 EP 1185 DI 10.1103/PhysRevLett.85.1182 PG 4 WC Physics, Multidisciplinary SC Physics GA 341VN UT WOS:000088611800011 ER PT J AU Niculescu, I Armstrong, CS Arrington, J Assamagan, KA Baker, OK Beck, DH Bochna, CW Carlini, RD Cha, J Cothran, C Day, DB Dunne, JA Dutta, D Ent, R Filippone, BW Frolov, VV Gao, H Geesaman, DF Gueye, PLJ Hinton, W Holt, RJ Jackson, HE Keppel, CE Koltenuk, DM Mack, DJ Meekins, DG Miller, MA Mitchell, JH Mohring, RM Niculescu, G Potterveld, D Price, JW Reinhold, J Segel, RE Stoler, P Tang, L Terburg, BP Van Westrum, D Vulcan, WF Wood, SA Yan, C Zeidman, B AF Niculescu, I Armstrong, CS Arrington, J Assamagan, KA Baker, OK Beck, DH Bochna, CW Carlini, RD Cha, J Cothran, C Day, DB Dunne, JA Dutta, D Ent, R Filippone, BW Frolov, VV Gao, H Geesaman, DF Gueye, PLJ Hinton, W Holt, RJ Jackson, HE Keppel, CE Koltenuk, DM Mack, DJ Meekins, DG Miller, MA Mitchell, JH Mohring, RM Niculescu, G Potterveld, D Price, JW Reinhold, J Segel, RE Stoler, P Tang, L Terburg, BP Van Westrum, D Vulcan, WF Wood, SA Yan, C Zeidman, B TI Experimental verification of quark-hadron duality SO PHYSICAL REVIEW LETTERS LA English DT Article ID DEUTERON STRUCTURE FUNCTIONS; ELECTRON-SCATTERING; FORM-FACTORS; PARTON DISTRIBUTIONS; GLOBAL ANALYSIS; PROTON; RESONANCES; ENERGIES; FREEDOM AB A newly obtained sample of inclusive electron-nucleon scattering data has been analyzed for precision tests of quark-hadron duality. The data are in the nucleon resonance region, and span the range 0.3 < Q(2) < 5.9 (GeV/c)(2). Duality is observed both in limited and extended regions around the prominent resonance enhancements. Higher twist contributions to the F-2 structure function are found to be small on average, even in the low Q(2) regime of approximate to 0.5 (GeV/c)(2) Using duality, an average scaling curve is obtained. In all cases, duality appears to be a nontrivial property of the nucleon structure function. C1 Hampton Univ, Hampton, VA 23668 USA. Coll William & Mary, Williamsburg, VA 23187 USA. CALTECH, Pasadena, CA 91125 USA. Univ Illinois, Urbana, IL 61801 USA. Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. Univ Virginia, Charlottesville, VA 22904 USA. Northwestern Univ, Evanston, IL 60208 USA. Rensselaer Polytech Inst, Troy, NY 12180 USA. Argonne Natl Lab, Argonne, IL 60439 USA. Univ Maryland, College Pk, MD 20742 USA. Univ Colorado, Boulder, CO 80309 USA. Univ Penn, Philadelphia, PA 19104 USA. RP Niculescu, I (reprint author), Hampton Univ, Hampton, VA 23668 USA. RI Gao, Haiyan/G-2589-2011; Arrington, John/D-1116-2012; Holt, Roy/E-5803-2011; Day, Donal/C-5020-2015 OI Arrington, John/0000-0002-0702-1328; Day, Donal/0000-0001-7126-8934 NR 26 TC 167 Z9 168 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 AUG 7 PY 2000 VL 85 IS 6 BP 1186 EP 1189 DI 10.1103/PhysRevLett.85.1186 PG 4 WC Physics, Multidisciplinary SC Physics GA 341VN UT WOS:000088611800012 ER PT J AU Elliott, JB Moretto, LG Phair, L Wozniak, GJ Albergo, S Bieser, F Brady, FP Caccia, Z Cebra, DA Chacon, AD Chance, JL Choi, Y Costa, S Gilkes, ML Hauger, JA Hirsch, AS Hjort, EL Insolia, A Justice, M Keane, D Kintner, JC Lindenstruth, V Lisa, MA Matis, HS McMahan, M McParland, C Muller, WFJ Olson, DL Partlan, MD Porile, NT Potenza, R Rai, G Rasmussen, J Ritter, HG Romanski, J Romero, JL Russo, GV Sann, H Scharenberg, RP Scott, A Shao, Y Srivastava, BK Symons, TJM Tincknell, M Tuve, C Wang, S Warren, PG Wieman, HH Wienold, T Wolf, K AF Elliott, JB Moretto, LG Phair, L Wozniak, GJ Albergo, S Bieser, F Brady, FP Caccia, Z Cebra, DA Chacon, AD Chance, JL Choi, Y Costa, S Gilkes, ML Hauger, JA Hirsch, AS Hjort, EL Insolia, A Justice, M Keane, D Kintner, JC Lindenstruth, V Lisa, MA Matis, HS McMahan, M McParland, C Muller, WFJ Olson, DL Partlan, MD Porile, NT Potenza, R Rai, G Rasmussen, J Ritter, HG Romanski, J Romero, JL Russo, GV Sann, H Scharenberg, RP Scott, A Shao, Y Srivastava, BK Symons, TJM Tincknell, M Tuve, C Wang, S Warren, PG Wieman, HH Wienold, T Wolf, K TI Nuclear multifragmentation, percolation, and the Fisher droplet model: Common features of reducibility and thermal scaling SO PHYSICAL REVIEW LETTERS LA English DT Article ID GOLD NUCLEI; FLUCTUATIONS; YIELDS; GROWTH AB It is shown that the Fisher droplet model, percolation, and nuclear multifragmentation share the common features of reducibility (stochasticity in multiplicity distributions) and thermal scaling tone-fragment production probabilities are Boltzmann factors). Barriers obtained, for cluster production on percolation lattices, from the Boltzmann factors show a power-law dependence on cluster size with an exponent of 0.42 +/- 0.02. The EOS Collaboration Au multifragmentation data yield barriers with a power-law exponent of 0.68 +/-. 0.03. Values of the surface energy coefficient of a low density nuclear system are also extracted. C1 Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA. Univ Catania, I-95129 Catania, Italy. Ist Nazl Fis Nucl, Sez Catania, I-95129 Catania, Italy. Univ Calif Davis, Davis, CA 95616 USA. Texas A&M Univ, College Stn, TX 77843 USA. Purdue Univ, W Lafayette, IN 47907 USA. Kent State Univ, Kent, OH 44242 USA. GSI, D-64220 Darmstadt, Germany. RP Elliott, JB (reprint author), Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA. 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 20 TC 41 Z9 42 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 AUG 7 PY 2000 VL 85 IS 6 BP 1194 EP 1197 DI 10.1103/PhysRevLett.85.1194 PG 4 WC Physics, Multidisciplinary SC Physics GA 341VN UT WOS:000088611800014 ER PT J AU Klein, W Gould, H Tobochnik, J Alexander, FJ Anghel, M Johnson, G AF Klein, W Gould, H Tobochnik, J Alexander, FJ Anghel, M Johnson, G TI Clusters and fluctuations at mean-field critical points and spinodals SO PHYSICAL REVIEW LETTERS LA English DT Article ID DEEPLY QUENCHED LIQUIDS; MOLECULAR-DYNAMICS; NUCLEATION; SUPERSYMMETRY AB We show that the structure of the fluctuations close to spinodals and mean-field critical points is qualitatively different from the structure close to non-mean-field critical points. This difference has important implications for many areas including the formation of glasses in supercooled liquids. In particular, the divergence of the measured static structure function in near-mean-field systems close to the glass transition is suppressed relative to the mean-field prediction in systems for which a spatial symmetry is broken. C1 Boston Univ, Dept Phys, Boston, MA 02215 USA. Boston Univ, Ctr Computat Sci, Boston, MA 02215 USA. Univ Calif Los Alamos Natl Lab, CNLS, Los Alamos, NM 87545 USA. Clark Univ, Dept Phys, Worcester, MA 01610 USA. Kalamazoo Coll, Dept Phys, Kalamazoo, MI 49006 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Klein, W (reprint author), Boston Univ, Dept Phys, 590 Commonwealth Ave, Boston, MA 02215 USA. NR 26 TC 11 Z9 11 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 AUG 7 PY 2000 VL 85 IS 6 BP 1270 EP 1273 DI 10.1103/PhysRevLett.85.1270 PG 4 WC Physics, Multidisciplinary SC Physics GA 341VN UT WOS:000088611800033 ER PT J AU Qin, H Davidson, RC Lee, WWL AF Qin, H Davidson, RC Lee, WWL TI 3D nonlinear perturbative particle simulations of two-stream collective processes in intense particle beams SO PHYSICS LETTERS A LA English DT Article ID PERIODIC FOCUSING FIELD; INSTABILITY; PROPAGATION; EQUATIONS; STABILITY; PSR AB Collective processes in intense charged particle beams described self-consistently by the Vlasov-Maxwell equations are studied using a 3D multispecies nonlinear perturbative particle simulation method. The newly-developed Beam Equilibrium Stability and Transport (BEST) code has been used to simulate the nonlinear stability properties of intense beam propagation, sm-face eigenmodes in a high-intensity beam, and the electron-proton (e-p) two-stream instability observed in the Proton Storage Ring (PSR). (C) 2000 Elsevier Science B.V. All rights reserved. C1 Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. RP Davidson, RC (reprint author), Princeton Univ, Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. NR 17 TC 11 Z9 11 U1 0 U2 0 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 AUG 7 PY 2000 VL 272 IS 5-6 BP 389 EP 394 DI 10.1016/S0375-9601(00)00440-0 PG 6 WC Physics, Multidisciplinary SC Physics GA 343MT UT WOS:000088706700012 ER PT J AU DeWoody, JA Fletcher, DE Wilkins, SD Avise, JC AF DeWoody, JA Fletcher, DE Wilkins, SD Avise, JC TI Parentage and nest guarding in the Tessellated Darter (Etheostoma olmstedi) assayed by microsatellite markers (Perciformes : Percidae) SO COPEIA LA English DT Article ID NATURAL-POPULATIONS; PATERNITY; MUTATIONS; PROPORTION; INFERENCE; EVOLUTION; TACTICS; ALLELES; PISCES; CARE AB parental investment as manifested through extended parental care of young presumably enhances the reproductive success of the custodial parent. In the Tessellated Darter (Etheostoma olmstedi), the primary caregivers are breeding males on the nest. However, prior field observations on nesting darters seem suggestive of behaviors that are more difficult to interpret evolutionarily. These include tending clutches that may have been fertilized by other males and appropriating nests from smaller courting males. To address such possibilities genetically, we assayed six microsatellite loci in 16 nest-tending males and the embryos from their associated clutches. In most cases, a guardian male had shed nearly all of the embryos in his nest. However, in one nest, a guardian male had been cuckolded, and in two other nests, an attendant male guarded embryos that were not his own presumably resulting from nest takeovers. From direct genotypic counts, a mean of at least 3.2 mothers contributed to the progeny in a nest, and computer simulations suggest that the true maternal number may be substantially higher. C1 Univ Georgia, Dept Genet, Athens, GA 30602 USA. Savannah River Ecol Lab, Aiken, SC 29802 USA. RP DeWoody, JA (reprint author), Univ Georgia, Dept Genet, Athens, GA 30602 USA. EM dewoody@arches.uga.edu RI DeWoody, James/C-4909-2008 OI DeWoody, James/0000-0002-7315-5631 NR 31 TC 37 Z9 38 U1 0 U2 8 PU AMER SOC ICHTHYOLOGISTS & HERPETOLOGISTS PI MIAMI PA MAUREEN DONNELLY, SECRETARY FLORIDA INT UNIV BIOLOGICAL SCIENCES, 11200 SW 8TH STREET, MIAMI, FL 33199 USA SN 0045-8511 EI 1938-5110 J9 COPEIA JI Copeia PD AUG 4 PY 2000 IS 3 BP 740 EP 747 PG 8 WC Zoology SC Zoology GA 369EV UT WOS:000165053800009 ER PT J AU Ryan, TJ Hopkins, WA AF Ryan, TJ Hopkins, WA TI Interaction of sex and size and the standard metabolic rate of paedomorphic Ambystoma talpoideum: Size does matter SO COPEIA LA English DT Article ID SALAMANDER; EVOLUTION; ARRIVAL; TIME AB We measured the standard metabolic rate of paedomorphic Mole Salamanders (Ambystoma talpoideum) from South Carolina. Despite an absence of body size differences between females and males, analysis of covariance demonstrated metabolic rates (mL O-2/h) were significantly influenced by an interaction between sex and body size. The interaction appeared as a result of changes in the size-metabolism relationship in males (a steeper slope in the size-metabolism regression in small males as compared to large males), whereas the relationship remained constant in females, regardless of size. We hypothesize that the observed differences are attributable to differences in reproductive physiology between the sexes. The results of this study underscore the need to evaluate the potential interactions among relevant variables in studies of metabolism, which heretofore have been disregarded in studies of salamander physiology. C1 Univ Georgia, Savannah River Ecol Lab, Aiken, SC 29802 USA. Univ Missouri, Div Biol Sci, Columbia, MO 65211 USA. Univ S Carolina, Div Biol Sci, Columbia, SC 29208 USA. RP Ryan, TJ (reprint author), Univ Georgia, Savannah River Ecol Lab, Drawer E, Aiken, SC 29802 USA. NR 19 TC 13 Z9 13 U1 0 U2 3 PU AMER SOC ICHTHYOLOGISTS HERPETOLOGISTS PI CHARLESTON PA UNIV CHARLESTON, GRICE MARINE LABORATORY, 205 FORT JOHNSON RD, CHARLESTON, SC 29412 USA SN 0045-8511 J9 COPEIA JI Copeia PD AUG 4 PY 2000 IS 3 BP 808 EP 812 DI 10.1643/0045-8511(2000)000[0808:IOSASA]2.0.CO;2 PG 5 WC Zoology SC Zoology GA 369EV UT WOS:000165053800020 ER PT J AU Shalliker, RA Broyles, BS Guiochon, G AF Shalliker, RA Broyles, BS Guiochon, G TI Physical evidence of two wall effects in liquid chromatography SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article DE wall effects; visualisation of wall effects ID RETENTION DATA; BAND PROFILES; PACKING MATERIALS; C-18 COLUMNS; REPRODUCIBILITY; REPEATABILITY; DISPERSION; DIAMETER; BEDS; VISUALIZATION AB Using optical on-column visualization for the study of the migration of sample bands, the radial variations of the local migration rate were studied in the region near the column wall. Photographs of small sample bands migrating along the column at various radial locations were obtained. On-column chromatograms extracted from these photographs showed evidence of two wall effects. The first of these effects was present only within the immediate vicinity of the wall. It is a direct result of the inability of the packing material to form a close packed configuration against the rigid column wall surface. The second wall effect causes a systematic variation of the migration rate of the sample band in the region of the wall, this rate increasing from the wall to the central region of the column. The corresponding images portrayed the classical "wall effect" that chromatographers have long discussed. They also show that this effect extends further into the column than anticipated. As to what are the relative contributions to the results of our observations of the wall effect and of a frit effect discussed in previous publications, this could not be ascertained. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. Univ Western Sydney, Fac Sci & Technol, CBBR, Richmond, NSW 2753, Australia. RP Guiochon, G (reprint author), Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA. NR 35 TC 84 Z9 86 U1 0 U2 15 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD AUG 4 PY 2000 VL 888 IS 1-2 BP 1 EP 12 DI 10.1016/S0021-9673(00)00517-3 PG 12 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA 338HV UT WOS:000088414100001 PM 10949467 ER PT J AU Gottschlich, N Culbertson, CT McKnight, TE Jacobson, SC Ramsey, JM AF Gottschlich, N Culbertson, CT McKnight, TE Jacobson, SC Ramsey, JM TI Integrated microchip-device for the digestion, separation and postcolumn labeling of proteins and peptides SO JOURNAL OF CHROMATOGRAPHY B LA English DT Article; Proceedings Paper CT Analytical Separations 2000 Symposium CY OCT 13-16, 1999 CL VAALS, NETHERLANDS DE microchip device; proteins; peptides ID OPEN-CHANNEL ELECTROCHROMATOGRAPHY; CAPILLARY ZONE ELECTROPHORESIS; MASS-SPECTROMETRY; PCR AMPLIFICATION; GLASS CHIPS; REACTOR; CHROMATOGRAPHY; SYSTEMS AB A microchip device was demonstrated that integrated enzymatic reactions, electrophoretic separation of the reactants from the products and post-separation labeling of proteins and peptides prior to detection. A tryptic digestion of oxidized insulin B-chain was performed in 15 min under stopped flow conditions in a heated channel, and the separation was completed in 1 min. Localized thermal control of the reaction channel was achieved using a resistive heating element. The separated reaction products were then labeled with naphthalene-2,3-dicarboxaldehyde (NDA) and detected by laser-induced fluorescence. A second reaction at elevated temperatures was also demonstrated for the on-chip reduction of disulfide bridges using insulin as a model protein. This device represents one of the highest levels, to date, of monolithic integration of chemical processes on a microchip. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Ramsey, JM (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA. RI McKnight, Tim/H-3087-2011 OI McKnight, Tim/0000-0003-4326-9117 NR 27 TC 69 Z9 73 U1 3 U2 16 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4347 J9 J CHROMATOGR B JI J. Chromatogr. B PD AUG 4 PY 2000 VL 745 IS 1 BP 243 EP 249 DI 10.1016/S0378-4347(00)00287-5 PG 7 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA 345HM UT WOS:000088810600020 PM 10997719 ER PT J AU Wei, W Yeung, ES AF Wei, W Yeung, ES TI Improvements in DNA sequencing by capillary electrophoresis at elevated temperature using poly(ethylene oxide) as a sieving matrix SO JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES LA English DT Article; Proceedings Paper CT Analytical Separations 2000 Symposium CY OCT 13-16, 1999 CL VAALS, NETHERLANDS DE DNA sequencing; poly(ethylene oxide) ID REPLACEABLE LINEAR POLYACRYLAMIDE; ENTANGLED POLYMER-SOLUTIONS; LINKED POLYACRYLAMIDE; 1000 BASES; SEPARATION; REPTATION; FRAGMENTS; GELS AB DNA sequencing in poly(ethylene oxide) (PEO) matrix by capillary electrophoresis was demonstrated at high temperature. The optimal separation temperature is around 40 degrees C. The effects of polymer concentration and types of buffers on the separation performance were investigated. A new buffer system consisting of Tris-Taps-His-EDTA works well with PEO. High-speed separation and good resolution can be fulfilled by using a single-MW PEO polymer. It offers similar separation performance as before for the small DNA fragments, but better performance for large DNA fragments. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Iowa State Univ, Ames Lab, USDOE, Ames, IA 50011 USA. Iowa State Univ, Dept Chem, Ames, IA 50011 USA. RP Iowa State Univ, Ames Lab, USDOE, Ames, IA 50011 USA. NR 32 TC 23 Z9 24 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1570-0232 EI 1873-376X J9 J CHROMATOGR B JI J. Chromatogr. B PD AUG 4 PY 2000 VL 745 IS 1 BP 221 EP 230 DI 10.1016/S0378-4347(00)00069-4 PG 10 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA 345HM UT WOS:000088810600018 PM 10997717 ER PT J AU Matzdorf, R Fang, Z Ismail Zhang, JD Kimura, T Tokura, Y Terakura, K Plummer, EW AF Matzdorf, R Fang, Z Ismail Zhang, JD Kimura, T Tokura, Y Terakura, K Plummer, EW TI Ferromagnetism stabilized by lattice distortion at the surface of the p-wave superconductor Sr2RuO4 SO SCIENCE LA English DT Article ID EXTENDED VANHOVE SINGULARITY; SPIN FLUCTUATIONS; LAYERED PEROVSKITE; FERMI-SURFACE; RUSR2GDCU2O8; TRIPLET AB Ferromagnetic (FM) spin fluctuations are believed to mediate the spin-triplet pairing for the rho-wave superconductivity in Sr2RuO4. Our experiments show that, at the surface, a bulk soft-phonon mode freezes into a static Lattice distortion associated with an in-plane rotation of the RuO6 octahedron. First-principle calculations confirm this structure and predict a FM ground state at the surface. This coupling between structure and magnetism in the environment of broken symmetry at the surface allows a reconsideration of the coupling mechanism in the bulk. C1 Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Florida Int Univ, Dept Phys, Miami, FL 33199 USA. Joint Res Ctr Atom Technol, Tsukuba, Ibaraki 3050046, Japan. Univ Tokyo, Dept Appl Phys, Tokyo 1130033, Japan. RP Matzdorf, R (reprint author), Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. RI Fang, Zhong/D-4132-2009; Tokura, Yoshinori/C-7352-2009 NR 22 TC 167 Z9 167 U1 7 U2 50 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD AUG 4 PY 2000 VL 289 IS 5480 BP 746 EP 748 DI 10.1126/science.289.5480.746 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 341FZ UT WOS:000088581500030 ER PT J AU Sickafus, KE Minervini, L Grimes, RW Valdez, JA Ishimaru, M Li, F McClellan, KJ Hartmann, T AF Sickafus, KE Minervini, L Grimes, RW Valdez, JA Ishimaru, M Li, F McClellan, KJ Hartmann, T TI Radiation tolerance of complex oxides SO SCIENCE LA English DT Article ID DAMAGE; PLUTONIUM; PHASE AB The radiation performance of a variety of complex oxides is predicted on the basis of a material's propensity to accommodate lattice point defects. The calculations indicate that a particular class of oxides possessing the fluorite crystal structure should accept radiation-induced defects into their Lattices far more readily than a structurally similar class of oxides based on the pyrochlore crystal structure. Preliminary radiation damage experiments substantiate the prediction that fluorites are inherently more radiation resistant than pyrochlores, These results may permit the chemical durability and radiation tolerance of potential hosts for actinides and radioactive wastes to be tailored. C1 Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. Univ London Imperial Coll Sci Technol & Med, Dept Mat, London SW7 2BP, England. Osaka Univ, Inst Sci & Ind Res, Osaka 5670047, Japan. RP Sickafus, KE (reprint author), Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, MS-G755, Los Alamos, NM 87545 USA. NR 23 TC 484 Z9 493 U1 20 U2 120 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD AUG 4 PY 2000 VL 289 IS 5480 BP 748 EP 751 DI 10.1126/science.289.5480.748 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 341FZ UT WOS:000088581500031 ER PT J AU Choquette, KD Klem, JF Fischer, AJ Blum, O Allerman, AA Fritz, IJ Kurtz, SR Breiland, WG Sieg, R Geib, KM Scott, JW Naone, RL AF Choquette, KD Klem, JF Fischer, AJ Blum, O Allerman, AA Fritz, IJ Kurtz, SR Breiland, WG Sieg, R Geib, KM Scott, JW Naone, RL TI Room temperature continuous wave InGaAsN quantum well vertical-cavity lasers emitting at 1.3 mu m SO ELECTRONICS LETTERS LA English DT Article AB Selectively oxidised vertical-cavity lasers emitting at 1294nm using InGaAsN/GaAs quantum wells which exhibit continuous wave operation at and above room temperature are reported for the first time. The lasers employ two n-type Al0.94Ga0.06As/GaAs distributed Bragg reflectors each with a selectively oxidised current aperture adjacent to the optical cavity, and the top output mirror contains a tunnel junction to inject holes into the active region. Continuous wave singlemode lasing is observed up to 55 degrees C. These lasers exhibit the longest wavelength reported to date for vertical-cavity surface lasers grown on GaAs substrates. C1 Sandia Natl Labs, Ctr Compound Semicond Sci & Technol, Albuquerque, NM 87185 USA. Cielo Commun Inc, Broomfield, CO 80021 USA. RP Choquette, KD (reprint author), Sandia Natl Labs, Ctr Compound Semicond Sci & Technol, POB 5800, Albuquerque, NM 87185 USA. NR 10 TC 247 Z9 250 U1 2 U2 17 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD SG1 2AY, ENGLAND SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD AUG 3 PY 2000 VL 36 IS 16 BP 1388 EP 1390 DI 10.1049/el:20000928 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA 344MJ UT WOS:000088762800038 ER PT J AU Scott, JR Groenewold, GS Gianotto, AK Benson, MT Wright, JB AF Scott, JR Groenewold, GS Gianotto, AK Benson, MT Wright, JB TI Experimental and computational study of hydration reactions of aluminum oxide anion clusters SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Article ID COLLISION-INDUCED DISSOCIATION; ION MASS-SPECTROMETRY; ACTIVATED ALUMINA; GAS-PHASE; AB-INITIO; SURFACE; WATER; ADSORPTION; CATIONS; TRAP AB Hydration of aluminum oxide anion clusters was studied in the gas phase using an ion trap secondary ion mass spectrometer. Hydration of both AlO2- and Al2O4H- occurred by the consecutive addition of two H2O molecules. For hydration of AlO2-, the rate constants for addition of the first and second water molecules are 4 x 10(-11) and 4 x 10(-10) cm(3) molecule(-1) s(-1), respectively. The first and second hydration rate constants for Al2O4H- are 2 x 10(-9) and 8 x 10(-10) cm(3) molecule(-1) s(-1), respectively. A comparison of the experimental rate constants to the theoretical rate constants reveals that addition of the first H2O to AlO2- is only 2% efficient, whereas addition of the first H2O to Al2O4H- is 100% efficient. Ab initio calculations were performed to assist in the interpretation of the kinetic results. Reaction mechanisms and energetics for the hydration of the AlO2- system were calculated using the HF/6-311+G(d(Al),p), B3LYP/6-31+G(d), B3LYP/6-311+G-(2d,p), B3LYP/6-311+G(3d2f,2p), and MP2/6-311+G(2d,p) levels of theory. Calculations on the hydration of the Al2O4H- system were performed using the B3LYP/6-311+G(2d,p) level of theory. Ab initio results revealed that the addition of the first and second waters, for both the AlO2- and Al2O4H- systems, results in the formation of four-membered transition states, with simultaneous Al-O bond formation and proton transfer. However, a significant later transition state is observed, with respect to the Al-O and H-O bond lengths, for the addition of the second water molecule in the Al2O4H- system. A comparison of the reaction mechanisms and energetics was not sufficient to account for the 2 orders of magnitude difference in rate constants; however, the reactivity differences do correlate with the dipole moment of the aluminum oxide anions, which may serve to preorient the incoming water molecule, thus enhancing the reaction rate. C1 Idaho Natl Lab, Idaho Falls, ID 83415 USA. Battelle Mem Inst, Bel Air, MD 21015 USA. RP 2525 N Fremont Ave,MS 2208, Idaho Falls, ID 83415 USA. EM scotjr@inel.gov; gsg@inel.gov RI Scott, Jill/G-7275-2012; Benson, Michael/B-8855-2017 OI Benson, Michael/0000-0003-4927-614X NR 64 TC 37 Z9 37 U1 1 U2 12 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5639 J9 J PHYS CHEM A JI J. Phys. Chem. A PD AUG 3 PY 2000 VL 104 IS 30 BP 7079 EP 7090 DI 10.1021/jp9944435 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA 340FN UT WOS:000088522600025 ER PT J AU Bratt, PJ Poluektov, OG Thurnauer, MC Krzystek, J Brunel, LC Schrier, J Hsiao, YW Zerner, M Angerhofer, A AF Bratt, PJ Poluektov, OG Thurnauer, MC Krzystek, J Brunel, LC Schrier, J Hsiao, YW Zerner, M Angerhofer, A TI The g-factor anisotropy of plant chlorophyll a(center dot) SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Letter ID PHOTOSYNTHETIC REACTION CENTER; BACTERIAL REACTION CENTERS; PRIMARY DONOR P-700; HIGH-FIELD EPR; PHOTOSYSTEM-I; RHODOPSEUDOMONAS-VIRIDIS; ELECTRONIC-STRUCTURE; SINGLE-CRYSTALS; RADICAL CATIONS; G-TENSORS AB High-field EPR experiments at 12 T/330 GHz were performed on chlorophyll a radical cations in methylene chloride at low temperatures. Using fully deuterated chlorophyll it was possible to obtain the principal components of the rhombic g-tensor as g(alpha) = 2.00329 +/- (5 x 10(-5)), g(beta) = 2.00275 +/- (8 x 10(-5)), and g(gamma) = 2.00220 +/- (8 x 10(-5)). Protonated chlorophyll radicals did not give enough spectral resolution to yield the g-anisotropy from the EPR spectrum. This was true even at higher field/frequency combinations up to 24 T/670 GHz, Semiempirical calculations were performed using the INDO/S method (ZINDO) which yielded good agreement with the experimental data. C1 Univ Florida, Dept Chem, Gainesville, FL 32611 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Florida State Univ, Natl High Magnet Field Lab, Ctr Interdisciplinary Magnet Resonance, Tallahassee, FL 32310 USA. St Peters Coll, Dept Chem, Jersey City, NJ 07306 USA. Univ Florida, Quantum Theory Project, Gainesville, FL 32611 USA. RP Angerhofer, A (reprint author), Univ Florida, Dept Chem, Box 117200, Gainesville, FL 32611 USA. RI Schrier, Joshua/B-6838-2009; Angerhofer, Alexander/E-3143-2010 OI Angerhofer, Alexander/0000-0002-8580-6024 NR 35 TC 28 Z9 30 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD AUG 3 PY 2000 VL 104 IS 30 BP 6973 EP 6977 DI 10.1021/jp001126l PG 5 WC Chemistry, Physical SC Chemistry GA 340FL UT WOS:000088522400001 ER PT J AU Higgins, SR Bosbach, D Eggleston, CM Knauss, KG AF Higgins, SR Bosbach, D Eggleston, CM Knauss, KG TI Kink dynamics and step growth on barium sulfate (001): A hydrothermal scanning probe microscopy study SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Letter ID ATOMIC-FORCE MICROSCOPY; AQUEOUS-SOLUTION; CRYSTAL-GROWTH; CANAVALIN CRYSTALLIZATION; SOFTWARE PACKAGE; DISSOLUTION; KINETICS; SURFACE; MECHANISMS; INTERFACE AB We have measured step growth kinetics on barium sulfate (001) as a function of step length, supersaturation, and temperature. rising a one-dimensional nucleation model, we report kink detachment coefficients for [120] monolayer steps of w- = 114 (+/-14), 187 (+/-17), and 357 (+/-43) s(-1), at 90, 108, and 125 degrees C, respectively, giving an activation energy, E-a = 0.39 (+/- 0.05) eV. The kink formation energy, epsilon, was found to be 0.16 (+/-0.02) eV. The uncertainty in this energy is sufficient to envelop the experimentally determined kink densities, but the lack of increase in experimental kink density with increase in temperature points to kinetic limitations in the experiments. Due to the kinetic limitations of growth at kinks whether they are from diffusion or attachment, our results demonstrate that knowledge of the kink kinetics as a function of temperature is important in testing the applicability of the classical thermodynamic model to kinetic data. C1 Univ Wyoming, Dept Geol & Geophys, Laramie, WY 82071 USA. Univ Munster, Inst Mineral, D-48149 Munster, Germany. Univ Calif Lawrence Livermore Natl Lab, Geosci & Environm Technol Div, Livermore, CA 94550 USA. RP Higgins, SR (reprint author), Univ Wyoming, Dept Geol & Geophys, Laramie, WY 82071 USA. RI Bosbach, Dirk/C-7764-2011; knauss, kevin/K-2827-2012 OI Bosbach, Dirk/0000-0002-6099-0400; NR 41 TC 37 Z9 39 U1 2 U2 21 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD AUG 3 PY 2000 VL 104 IS 30 BP 6978 EP 6982 DI 10.1021/jp0001135 PG 5 WC Chemistry, Physical SC Chemistry GA 340FL UT WOS:000088522400002 ER PT J AU Ryder, JA Chakraborty, AK Bell, AT AF Ryder, JA Chakraborty, AK Bell, AT TI Density functional theory study of proton mobility in zeolites: Proton migration and hydrogen exchange in ZSM-5 SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID BRONSTED ACID SITES; H-1 MAS NMR; AB-INITIO CALCULATIONS; MOLECULAR ADSORPTION; H/D EXCHANGE; H-ZSM-5; METHANOL; WATER; CATALYSTS; DYNAMICS AB Acidic protons in zeolites are known to be mobile at elevated temperatures. In this study, density functional theory was used to identify the reaction pathways for proton migration in a model that represents the zeolite ZSM-5. In the absence of water, the acidic proton "hops" or migrates between two of the four O atoms surrounding an aluminum center with an activation barrier of 28 kcal/mol. During proton transfer, the O atoms stretch closer together in order to stabilize the transition state. This is revealed by a 13.4 degrees decrease in the O-Al-O bond angle. Adsorbed water bridges the proton donor and acceptor sites, reducing he barrier height by 24 kcal/mol. Hence proton migration depends heavily on the local geometry and conditions of the zeolite. We show that experimentally undetectable amounts of water can greatly influence the measured rates and apparent activation barriers. We broaden the scope of our study to consider hydrogen exchange with other gas-phase species of the form RO-H (RO = CH3O, CH3CH2O) and R-H (R = H, CH3, C2H5, C3H7, C6H5). It is evident that to a first approximation the activation barrier increases with an increase in the polarizability of the species RO-H. For the chemical series R-H, the activation energy increases with the deprotonation energy of the interacting species R-H. We also calculate the overall reaction rate constants for proton hopping and hydrogen exchange. C1 Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Sci Mat, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RP Chakraborty, AK (reprint author), Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA. OI Bell, Alexis/0000-0002-5738-4645 NR 51 TC 77 Z9 79 U1 2 U2 30 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD AUG 3 PY 2000 VL 104 IS 30 BP 6998 EP 7011 DI 10.1021/jp9943427 PG 14 WC Chemistry, Physical SC Chemistry GA 340FL UT WOS:000088522400005 ER PT J AU Tretiak, S Saxena, A Martin, RL Bishop, AR AF Tretiak, S Saxena, A Martin, RL Bishop, AR TI Interchain electronic excitations in poly(phenylenevinylene) (PPV) aggregates SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID DIFFERENTIAL-OVERLAP TECHNIQUE; SEMICONDUCTING POLYMER DIODES; PI-CONJUGATED OLIGOMERS; VINYLENE) DERIVATIVES; OPTICAL-EXCITATIONS; PHENYLACETYLENE DENDRIMERS; OPTOELECTRONIC DEVICES; INTERMEDIATE NEGLECT; CONDUCTING POLYMERS; ABSORPTION-SPECTRA AB The semiempirical collective electronic oscillators (CEO) approach based on a time-dependent Hartree-Fock approximation is applied to analyze formation of interchain electronic excitations in PPV aggregates composed of two weakly coupled chain segments. Real-space analysis of transition density matrices identifies the origins of electron-hole pairs created upon optical excitation. The singlet intrachain excitons are delocalized along the whole oligomer chain and manifest themselves as strong band edge transitions in the linear spectra. New low-frequency interchain electronic excitations appear upon bringing oligomer chains into close proximity (3-4 Angstrom). These new electronic states localized at the near-contact have no signatures in linear absorption, We argue that they may significantly decrease luminescence quantum efficiency of polymer films. C1 Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. RP Tretiak, S (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. EM serg@cnls.lanl.gov RI Tretiak, Sergei/B-5556-2009 OI Tretiak, Sergei/0000-0001-5547-3647 NR 66 TC 75 Z9 76 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD AUG 3 PY 2000 VL 104 IS 30 BP 7029 EP 7037 DI 10.1021/jp000397t PG 9 WC Chemistry, Physical SC Chemistry GA 340FL UT WOS:000088522400008 ER PT J AU Won, YY Davis, HT Bates, FS Agamalian, M Wignall, GD AF Won, YY Davis, HT Bates, FS Agamalian, M Wignall, GD TI Segment distribution of the micellar brushes of poly(ethylene oxide) via small-angle neutron scattering SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID POLYMER BRUSHES; COPOLYMER MICELLES; BLOCK-COPOLYMERS; AQUEOUS-SOLUTION; MODEL; CONFORMATIONS; CHAINS; INTERFACES; SURFACES AB Coronal structures of the micelles spontaneously formed in water by poly(ethylene oxide)-b-polybutadiene (PEO-PB) were investigated using small-angle neutron scattering (SANS). Selective deuterium labeling of the hydrophobic PB block was employed to enhance the neutron scattering contrast between the PEO and PB segments for subsequent structural characterization of their micelles. Analyses of the core- and corona-contrast SANS data based on the intramicellar interference factors led to determination of the segment density profiles of the micellar PEO brushes. Both spherical and cylindrical brushes proved to have coronal layers that are best described in form by a concave concentration profile. The results are consistent with the view that the PEO segments, despite favorable interactions with water molecules, are significantly accumulated near the hydrophobic interface, possibly due to the effect of the strong incompatibility of PB and water. C1 Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA. Oak Ridge Natl Lab, Natl Ctr Small Angle Scattering Res, Oak Ridge, TN 37831 USA. RP Bates, FS (reprint author), Univ Minnesota, Dept Chem Engn & Mat Sci, 421 Washington Ave SE, Minneapolis, MN 55455 USA. EM bates@cems.umn.edu OI Agamalian, Michael/0000-0002-9112-2534; Wignall, George/0000-0002-3876-3244; Bates, Frank/0000-0003-3977-1278 NR 44 TC 74 Z9 74 U1 2 U2 19 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1520-6106 J9 J PHYS CHEM B JI J. Phys. Chem. B PD AUG 3 PY 2000 VL 104 IS 30 BP 7134 EP 7143 DI 10.1021/jp000457v PG 10 WC Chemistry, Physical SC Chemistry GA 340FL UT WOS:000088522400024 ER PT J AU Ueno, Y Muramatsu, Y Grush, MM Perera, RCC AF Ueno, Y Muramatsu, Y Grush, MM Perera, RCC TI Configurations of benzene and pyridine molecules adsorbed on graphitic surface of microporous carbon SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID MM3 FORCE-FIELD; ALPHA-CLUSTER CALCULATIONS; X-RAY-ABSORPTION; ENERGY MINIMIZATION; ELECTRONIC EXCITATIONS; ACTIVATED CARBON; MECHANICS; HYDROCARBONS; DIFFRACTION; ADSORPTION AB The possible configurations of benzene and pyridine molecules adsorbed in microporous carbon were analyzed by synchrotron radiation-excited soft X-ray emission spectroscopy and by analyzing its spectral features using DV-XQ molecular orbital calculations. The distances between the adsorbed molecules and the graphitic surface were estimated to be approximately 0.33 nm in both benzene- and pyridine-adsorbed systems. Both molecular orientations were also estimated to be almost parallel to the graphitic surface of microporous carbon. The electronic states of benzene and pyridine molecules adsorbed on the graphitic surface were similar to those of individual nonadsorbed free molecules. Therefore, the adsorption of benzene and pyridine molecules in the microporous carbon can be confirmed to be physisorption, and there is little charge-transfer between the adsorbed molecules and the graphitic surface. C1 NTT, Lifestyle & Environm Technol Labs, Atsugi, Kanagawa 2430198, Japan. Univ Tennessee, Knoxville, TN 37996 USA. Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Ueno, Y (reprint author), NTT, Lifestyle & Environm Technol Labs, Atsugi, Kanagawa 2430198, Japan. RI Ueno, Yuko/H-5651-2012 NR 51 TC 7 Z9 7 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD AUG 3 PY 2000 VL 104 IS 30 BP 7154 EP 7162 DI 10.1021/jp000669s PG 9 WC Chemistry, Physical SC Chemistry GA 340FL UT WOS:000088522400027 ER PT J AU Jiang, JW Prausnitz, JM AF Jiang, JW Prausnitz, JM TI Molecular thermodynamics for partitioning of native and denatured proteins in aqueous two-phase systems SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Review ID POLYMER 2-PHASE SYSTEMS; POTASSIUM HYDROGEN PHOSPHATE; POLYETHYLENE-GLYCOL-DEXTRAN; LIQUID-LIQUID EQUILIBRIA; OSMOTIC VIRIAL EQUATION; POLY(ETHYLENE GLYCOL); AMINO-ACIDS; PLUS WATER; POLYELECTROLYTE SOLUTIONS; 2-POLYMER SYSTEMS AB A molecular-thermodynamic analysis of protein partitioning in an aqueous two-phase system shows that the partition coefficient for a native (globular) protein is very much different from that for a denatured (linear) protein; while the former is weakly dependent on protein molecular weight, the latter depends strongly on molecular weight. The native protein and the denatured protein are represented, respectively, by a spherical macroion and by a linear flexible polyion. On the basis of McMillan-Mayer solution theory, the interactions between particles are represented by a continuum-averaged potential of mean force containing hard-sphere repulsion, the effect of penetration or hydration forces, electrostatic interactions, osmotic attraction, and specific interactions. Phase diagrams are calculated for polymer-polymer and for polymer-salt aqueous two-phase-forming systems in good agreement with experiment. Coupled with measured data for obtaining model parameters, partition coefficients are calculated for a native protein, lysozyme. Calculated partition coefficients for a denatured protein are compared with experimental partitioning data for short peptides. Calculated results are remarkably similar to those observed. C1 Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA. RP Prausnitz, JM (reprint author), Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA. RI JIANG, Jianwen/G-1505-2013; OI Jiang, Jianwen/0000-0003-1310-9024 NR 127 TC 18 Z9 20 U1 1 U2 13 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD AUG 3 PY 2000 VL 104 IS 30 BP 7197 EP 7205 DI 10.1021/jp994371h PG 9 WC Chemistry, Physical SC Chemistry GA 340FL UT WOS:000088522400033 ER PT J AU Palma, R Himmel, ME Brady, JW AF Palma, R Himmel, ME Brady, JW TI Calculation of the potential of mean force for the binding of glucose to benzene in aqueous solution SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID MOLECULAR-DYNAMICS SIMULATIONS; PI INTERACTIONS; THERMODYNAMIC INTEGRATION; CRYSTAL-STRUCTURE; L-ARABINOSE; D-GALACTOSE; ENERGY; PROTEINS; WATER; SOLVENT AB Molecular dynamics simulations employing umbrella sampling techniques have been used to calculate the potential of mean force (pmf) for the binding of a beta-D-glucopyranose molecule to a benzene molecule in aqueous solution, as a model for the binding of sugar substrates to phenylalanine residues in proteins. The interaction of these two molecules was found to be strongly affected by hydration, as expected, with their nonpolar faces pairing by hydrophobic association to minimize the exposure of apolar groups to water. The pmf for the approach of these molecules is oscillatory in character, with two primary low-energy minima separated by a high free energy barrier, and with the net binding energy being approximately 1.1 kcal/mol and the intervening barrier being almost 2 kcal/mol. A third, weaker minimum was observed between 11 and 12 Angstrom. The oscillatory nature of the pmf results from the successive removal of water layers between the two molecules as they approach one another. C1 Cornell Univ, Dept Food Sci, Ithaca, NY 14853 USA. Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Brady, JW (reprint author), Cornell Univ, Dept Food Sci, Stocking Hall, Ithaca, NY 14853 USA. NR 45 TC 31 Z9 31 U1 1 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1089-5647 J9 J PHYS CHEM B JI J. Phys. Chem. B PD AUG 3 PY 2000 VL 104 IS 30 BP 7228 EP 7234 DI 10.1021/jp0017341 PG 7 WC Chemistry, Physical SC Chemistry GA 340FL UT WOS:000088522400037 ER PT J AU Richmond, CR AF Richmond, CR TI How neptunium led to the birth of plutonium SO NATURE LA English DT Letter C1 Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. RP Richmond, CR (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37830 USA. NR 2 TC 1 Z9 1 U1 0 U2 0 PU MACMILLAN PUBLISHERS LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 J9 NATURE JI Nature PD AUG 3 PY 2000 VL 406 IS 6795 BP 455 EP 455 DI 10.1038/35020248 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA 340ML UT WOS:000088538000015 ER PT J AU Blasi, P Sheth, RK AF Blasi, P Sheth, RK TI Halo dark matter and ultra-high energy cosmic rays SO PHYSICS LETTERS B LA English DT Article ID ANISOTROPY AB The decay of very heavy metastable relies of the Early Universe can produce ultra-high energy cosmic rays (UHECRs) in the halo of our own Galaxy. On distance scales of the order of the halo size, energy losses are negligible - no Greisen-Zatsepin-Kuzmin cutoff is expected. In this letter we show that, as a consequence of the hierarchical build up of the halo, this scenario predicts the existence of small scale anisotropies in the arrival directions of UHECRs. We also suggest some consequences of this scenario which will be testable with upcoming experiments, as Auger. (C) 2000 Published by Elsevier Science B.V. C1 Fermi Natl Accelerator Lab, NASA Fermilab Astrophys Grp, Batavia, IL 60510 USA. RP Blasi, P (reprint author), Fermi Natl Accelerator Lab, NASA Fermilab Astrophys Grp, POB 500, Batavia, IL 60510 USA. RI Blasi, Pasquale/O-9345-2015 OI Blasi, Pasquale/0000-0003-2480-599X NR 19 TC 36 Z9 36 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 AUG 3 PY 2000 VL 486 IS 3-4 BP 233 EP 238 DI 10.1016/S0370-2693(00)00784-X PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 343DQ UT WOS:000088686800001 ER PT J AU Nieto, MM AF Nieto, MM TI A simple volcano potential with an analytic, zero-energy, ground state SO PHYSICS LETTERS B LA English DT Article ID POWER-LAW POTENTIALS; E=0 AB We describe a simple volcano potential, which is supersymmetric and has an analytic, zero-energy, ground state. (The KK modes are also analytic.) It is an interior harmonic oscillator potential properly matched to an exterior angular momentum-like tail. Special cases are given to elucidate the physics, which may he intuitively useful in studies of higher-dimensional gravity. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, Div Theoret MSB285, Los Alamos, NM 87545 USA. RP Nieto, MM (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret MSB285, Los Alamos, NM 87545 USA. NR 15 TC 15 Z9 15 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 AUG 3 PY 2000 VL 486 IS 3-4 BP 414 EP 417 DI 10.1016/S0370-2693(00)00787-5 PG 4 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 343DQ UT WOS:000088686800025 ER PT J AU Bergmann, S Grossman, Y Ligeti, Z Nir, Y Petrov, AA AF Bergmann, S Grossman, Y Ligeti, Z Nir, Y Petrov, AA TI Lessons from CLEO and FOCUS measurements of D-0-(D-0)over-bar mixing parameters SO PHYSICS LETTERS B LA English DT Article ID CABIBBO-SUPPRESSED DECAYS; CP VIOLATION; SEARCH; D-0; DIFFERENCE AB If the true values of the D degrees-<(D degrees)over bar> mixing parameters lie within the one sigma ranges of recent measurements, then there is strong evidence for a large width difference, y greater than or similar to 0.01, and large SU(3) breaking effects in strong phases, delta greater than or similar to pi/4. These constraints are model independent, and would become stronger if /M-12/Gamma(12)/ much less than 1 in the D degrees-<(D degrees)over bar> system. The interesting fact that the FOCUS result cannot be explained by a large mass difference is not trivial and depends on the small D degrees/<(D degrees)over bar> production asymmetry in FOCUS and the bounds on CP violating effects from CLEO, The large value of delta might help explain why y similar to sin(2)theta(c). (C) 2000 Elsevier Science B.V. All rights reserved. C1 Weizmann Inst Sci, Dept Particle Phys, IL-76100 Rehovot, Israel. Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. Fermilab, Theory Grp, Batavia, IL 60510 USA. Inst Adv Study, Sch Nat Sci, Princeton, NJ 08540 USA. Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA. RP Bergmann, S (reprint author), Weizmann Inst Sci, Dept Particle Phys, IL-76100 Rehovot, Israel. RI Petrov, Alexey/F-2882-2010; OI Bergmann, Sven/0000-0002-6785-9034 NR 24 TC 98 Z9 98 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 AUG 3 PY 2000 VL 486 IS 3-4 BP 418 EP 425 DI 10.1016/S0370-2693(00)00772-3 PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA 343DQ UT WOS:000088686800026 ER PT J AU Su, H Yeung, ES AF Su, H Yeung, ES TI High-throughput screening of heterogeneous catalysts by laser-induced fluorescence imaging SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID LIBRARIES C1 US DOE, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Chem, Ames, IA 50011 USA. RP Yeung, ES (reprint author), US DOE, Ames Lab, Ames, IA 50011 USA. NR 9 TC 60 Z9 61 U1 0 U2 4 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 AUG 2 PY 2000 VL 122 IS 30 BP 7422 EP 7423 DI 10.1021/ja001429t PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA 342RF UT WOS:000088658400045 ER PT J AU Zhao, YS Chu, FM Von Dreele, RB Zhu, Q AF Zhao, YS Chu, FM Von Dreele, RB Zhu, Q TI Structural phase transitions of HfV2 at low temperatures SO ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE LA English DT Article ID ELASTIC PROPERTIES; LAVES-PHASE; SUPERCONDUCTIVITY; TRANSFORMATION; DEFORMATION AB We report a high-resolution synchrotron X-ray powder diffraction study on HfV2, hafnium divanadium, at low temperatures. In this work we show, for the first time, a complete sequence of structural phase transitions of HfV2 from cubic (Fd3m) to tetragonal (I4(1)/amd) to orthorhombic (Imma) in succession as temperature decreases. Peak splitting and extra diffraction peaks owing to lattice distortion can be clearly distinguished for the low-symmetry phases. The atomic positions and lattice parameters were obtained by Rietveld refinement. The bond lengths and angles of the HfV2 crystal structure at the low-symmetry phases were correctly determined from the structure refinement. The face-centered cubic (Fd3m) unit cell (Z = 24) transforms to a body-centered tetragonal (I4(1)/amd) phase with a 45 degrees rotation relative to the cubic cell and with a reduced number of atoms (Z = 12) in the unit cell at a temperature of T = 112 K. The orthorhombic phase occurs at T = 102 K and it keeps the body-centered symmetry (Imma) and Z = 12 in the unit cell. The refinement results indicate that there may be a small amount of untransformed cubic phase left over in the lower symmetry phases. The abnormal thermal contraction of both tetragonal phase and orthorhombic phase marks the significance of structural change in HfV2. C1 Univ Calif Los Alamos Natl Lab, LANSCE Div, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, MST Div, Los Alamos, NM 87545 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Zhao, YS (reprint author), Univ Calif Los Alamos Natl Lab, LANSCE Div, POB 1663, Los Alamos, NM 87545 USA. RI Lujan Center, LANL/G-4896-2012 NR 12 TC 6 Z9 6 U1 0 U2 4 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-7681 J9 ACTA CRYSTALLOGR B JI Acta Crystallogr. Sect. B-Struct. Sci. PD AUG PY 2000 VL 56 BP 601 EP 606 DI 10.1107/S0108768100003633 PN 4 PG 6 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA 341XA UT WOS:000088615200009 PM 10944250 ER PT J AU Bryan, JC AF Bryan, JC TI 2,4-Bis(alpha,alpha-dimethylbenzyl)phenol SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article AB The structure of the title compound, 2,4-bis(1-methyl-1-phenylethyl)phenol, C24H26O, was found to have a torsion angle of 129.95 (13)degrees for the C-C bond that connects the benzyl carbon to the phenol ring ortho to the OH group. A value of similar to 50 degrees was expected from molecular mechanics calculations. Intermolecular interactions, in particular O- H ... O and edge-face pi bonding, may contribute to this discrepancy. Intramolecular O-H ...pi bonding is also observed. C1 Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RP Bryan, JC (reprint author), Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. NR 11 TC 3 Z9 3 U1 0 U2 0 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 AUG PY 2000 VL 56 BP 1046 EP 1047 DI 10.1107/S0108270100007782 PN 8 PG 2 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA 343GY UT WOS:000088694400055 ER PT J AU Yang, F Dauter, Z Wlodawer, A AF Yang, F Dauter, Z Wlodawer, A TI Effects of crystal twinning on the ability to solve a macromolecular structure using multiwavelength anomalous diffraction SO ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY LA English DT Article ID MOLECULAR-REPLACEMENT; ANGSTROM-RESOLUTION AB The crystal structure of gpD, the capsid-stabilizing protein of bacteriophage lambda, was solved by multiwavelength anomalous diffraction (MAD) for a selenomethionine (SeMet) derivative of the protein at 1.8 Angstrom resolution, using crystals in space group P2(1) [Yang et al. (2000), Nature Struct. Biol. 7, 230-237]. Subsequent analysis showed that the crystals of both the original protein and the SeMet derivative were pseudomerohedrally twinned with a twinning fraction similar or equal to 0.36, owing to the near-identity of the a and c axes. An analysis of the crystal structure solution is presented and the utility of twinned crystals for solving the structure using MAD and of different phasing strategies is discussed; the results obtained with several software packages are compared. C1 NCI, Prot Struct Sec, Macromol Crystallog Lab, Program Struct Biol,FCRDC, Frederick, MD 21702 USA. Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. NCI, Synchrotron Radiat Res Sect, Macromol Crystallog Lab, Program Struct Biol, Upton, NY 11973 USA. RP Wlodawer, A (reprint author), NCI, Prot Struct Sec, Macromol Crystallog Lab, Program Struct Biol,FCRDC, Frederick, MD 21702 USA. NR 21 TC 28 Z9 28 U1 0 U2 1 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 AUG PY 2000 VL 56 BP 959 EP 964 DI 10.1107/S0907444900007162 PN 8 PG 6 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Biophysics; Crystallography SC Biochemistry & Molecular Biology; Biophysics; Crystallography GA 337WD UT WOS:000088384200004 PM 10944332 ER PT J AU Terwilliger, TC AF Terwilliger, TC TI Maximum-likelihood density modification SO ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY LA English DT Article ID PHASE REFINEMENT; COMBINING CONSTRAINTS; IMPROVEMENT; EXTENSION; ENTROPY; CRYSTALLOGRAPHY; HISTOGRAM; AMBIGUITY; REAL AB A likelihood-based approach to density modification is developed that can be applied to a wide variety of cases where some information about the electron density at various points in the unit cell is available. The key to the approach consists of developing likelihood functions that represent the probability that a particular value of electron density is consistent with prior expectations for the electron density at that point in the unit cell. These likelihood functions are then combined with likelihood functions based on experimental observations and with others containing any prior knowledge about structure factors to form a combined likelihood function for each structure factor. A simple and general approach to maximizing the combined likelihood function is developed. It is found that this likelihood-based approach yields greater phase improvement in model and real test cases than either conventional solvent flattening and histogram matching or a recent reciprocal-space solvent-flattening procedure [Terwilliger (1999), Acta Cryst. D55, 1863-1871]. C1 Univ Calif Los Alamos Natl Lab, Struct Biol Grp, Los Alamos, NM 87545 USA. RP Terwilliger, TC (reprint author), Univ Calif Los Alamos Natl Lab, Struct Biol Grp, Mail Stop M888, Los Alamos, NM 87545 USA. RI Terwilliger, Thomas/K-4109-2012 OI Terwilliger, Thomas/0000-0001-6384-0320 NR 31 TC 1494 Z9 1505 U1 0 U2 21 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 AUG PY 2000 VL 56 BP 965 EP 972 DI 10.1107/S0907444900005072 PN 8 PG 8 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Biophysics; Crystallography SC Biochemistry & Molecular Biology; Biophysics; Crystallography GA 337WD UT WOS:000088384200005 PM 10944333 ER PT J AU Bellamy, HD Snell, EH Lovelace, J Pokross, M Borgstahl, GEO AF Bellamy, HD Snell, EH Lovelace, J Pokross, M Borgstahl, GEO TI The high-mosaicity illusion: revealing the true physical characteristics of macromolecular crystals SO ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY LA English DT Article ID PROTEIN CRYSTALS; DIFFRACTION DATA; MICROGRAVITY; PERFECTION; ALGORITHM AB Typical measurements of macromolecular crystal mosaicity are dominated by the characteristics of the X-ray beam and as a result the mosaicity value given during data processing can be an artifact of the instrumentation rather than the sample. For physical characterization of crystals, an experimental system and software have been developed to simultaneously measure the diffraction resolution and mosaic spread of macromolecular crystals. The contributions of the X-ray beam to the reflection angular widths were minimized by using a highly parallel, highly monochromatic synchrotron source. Hundreds of reflection profiles over a wide resolution range were rapidly measured using a charge-coupled device (CCD) area detector in combination with superfine phi-slicing data collection. The Lorentz effect and beam contributions were evaluated and deconvoluted from the recorded data. Data collection and processing is described. From 1 degrees of superfine phi-slice data collected on a crystal of manganese superoxide dismutase, the mosaicities of 260 reflections were measured. The average mosaicity was 0.0101 degrees (s.d. 0.0035 degrees) measured as the full-width at half-maximum (FWHM) and ranged from 0.0011 to 0.0188 degrees. Each reflection profile was individually fitted with two Gaussian profiles, with the first Gaussian contributing 55% (s.d. 9%) and the second contributing 35% (s.d. 9%) of the reflection. On average, the deconvoluted width of the first Gaussian was 0.0054 degrees (s.d. 0.0015 degrees) and the second was 0.0061 degrees (s.d. 0.0023 degrees). The mosaicity of the crystal was anisotropic, with FWHM values of 0.0068, 0.0140 and 0.0046 degrees along the a, b and c axes, respectively. The anisotropic mosaicity analysis indicates that the crystal is most perfect in the direction that corresponds to the favored growth direction of the crystal. C1 Univ Toledo, Dept Chem, Toledo, OH 43606 USA. Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. NASA, Struct Biol Lab, George C Marshall Space Flight Ctr, Huntsville, AL 35812 USA. RP Borgstahl, GEO (reprint author), Univ Toledo, Dept Chem, 2801 W Bancroft St, Toledo, OH 43606 USA. NR 25 TC 34 Z9 35 U1 2 U2 6 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 AUG PY 2000 VL 56 BP 986 EP 995 DI 10.1107/S0907444900007356 PN 8 PG 10 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Biophysics; Crystallography SC Biochemistry & Molecular Biology; Biophysics; Crystallography GA 337WD UT WOS:000088384200007 PM 10944335 ER PT J AU Swaminathan, S Eswaramoorthy, S AF Swaminathan, S Eswaramoorthy, S TI Crystallization and preliminary X-ray analysis of Clostridium botulinum neurotoxin type B SO ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY LA English DT Article ID BACTERIAL PROTEIN TOXINS; NEUROTRANSMITTER RELEASE; CRYSTAL-STRUCTURE; TETANUS TOXIN; SEROTYPE-A; ZINC; PURIFICATION; MEMBRANES; GANGLIOSIDES; DIFFRACTION AB Single crystals of Clostridium botulinum neurotoxin type B have been obtained by the vapor-diffusion method. These crystals belong to space group P2(1), with unit-cell parameters a = 76.08, b = 123.11, c = 95.86 Angstrom, beta = 113.03 degrees and diffract to at least 1.8 Angstrom resolution. Native data have been collected from flash-frozen crystals at the National Synchrotron facility of Brookhaven National Laboratory. These crystals often tend to be non-isomorphic. C1 Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA. RP Swaminathan, S (reprint author), Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA. NR 32 TC 15 Z9 15 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 AUG PY 2000 VL 56 BP 1024 EP 1026 DI 10.1107/S0907444900006764 PN 8 PG 3 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Biophysics; Crystallography SC Biochemistry & Molecular Biology; Biophysics; Crystallography GA 337WD UT WOS:000088384200015 PM 10944343 ER PT J AU Aggarwal, S Nagaraj, B Jenkins, IG Li, H Sharma, RP Salamanca-Riba, L Ramesh, R Dhote, AM Krauss, AR Auciello, O AF Aggarwal, S Nagaraj, B Jenkins, IG Li, H Sharma, RP Salamanca-Riba, L Ramesh, R Dhote, AM Krauss, AR Auciello, O TI Correlation between oxidation resistance and crystallinity of Ti-Al as a barrier layer for high-density memories SO ACTA MATERIALIA LA English DT Article DE transmission electron microscopy (TEM); thin films; titanium alloys; metallic glasses; ferroelectricity ID FERROELECTRIC THIN-FILMS; SI-N FILMS; KINETICS; CAPACITORS; DEPOSITION; TITANIUM; ALUMINUM; ELECTRODES; MECHANISMS; COATINGS AB The Ti-Al intermetallic material system has been investigated for application as a conducting diffusion barrier in a three-dimensional stacked capacitor-transistor geometry. La-Sr-Co-O (LSCO)/Pb-Zr-Ti-Nb-O/La-Sr-Co-O ferroelectric capacitors were fabricated on Ti-Al/polycrystalline-Si/Si substrates. The electrical and ferroelectric properties are found to correlate strongly with the crystallinity of the Ti-Al layer. The crystalline Ti-Al layer shows a distinct chemical reaction with the bottom LSCO electrode thus preventing ohmic electrical contact between the ferroelectric capacitor and transistor. In contrast, the amorphous Ti-Al layer does not react and forms an ohmic contact to LSCO. For crystalline Ti-Al. S-ray photoelectron spectroscopy (XPS) shows the formation of Al(2)O(3) induced by the segregation of Al to the LSCO/Ti-Al interface. For amorphous Ti-Al, XPS reveals that no Al(2)O(3) layer is formed. In addition, Rutherford backscattering analysis shows almost no difference in the Ti-peak spectrum before and after deposition of LSCO. (C) 2000 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights, reserved. C1 Univ Maryland, Dept Mat & Nucl Engn, College Pk, MD 20742 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Aggarwal, S (reprint author), Univ Maryland, Dept Mat & Nucl Engn, College Pk, MD 20742 USA. RI Salamanca-Riba, Lourdes/B-3785-2009 OI Salamanca-Riba, Lourdes/0000-0001-8155-6403 NR 38 TC 24 Z9 28 U1 2 U2 14 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 1359-6454 J9 ACTA MATER JI Acta Mater. PD AUG 1 PY 2000 VL 48 IS 13 BP 3387 EP 3394 DI 10.1016/S1359-6454(00)00148-8 PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA 352CL UT WOS:000089196900010 ER PT J AU Beaudoin, AJ Acharya, A Chen, SR Korzekwa, DA Stout, MG AF Beaudoin, AJ Acharya, A Chen, SR Korzekwa, DA Stout, MG TI Consideration of grain-size effect and kinetics in the plastic deformation of metal polycrystals SO ACTA MATERIALIA LA English DT Article DE constitutive equation; polycrystal plasticity; theory & modeling; thermally activated processes; stress-strain relationship measurements ID FLOW; TEMPERATURE; EVOLUTION; CREEP; PREDICTIONS; CU AB This work extends the constitutive model For the prediction of grain-size dependent hardening in f.c.c, polycrystalline metals proposed by Acharya and Beaudoin [1] (Grain-size effect in fee viscoplastic polycrystals at moderate strains, 1999, in press) to include effects of temperature and strain rate dependence. A comparison is made between model predictions and compression data, taken at varying temperature and strain rate, for pure Ag having two different grain sizes. It is shown that an initial increase in yield stress and concomitant decrease in hardening rate for a fine-grained material, relative to a coarse-grained counterpart, can be captured through initialization of a state variable serving to describe stress response at prescribed reference conditions of temperature and strain rate. A grain-size dependence of hardening rate during parabolic (stage III) hardening is characterized by the evolution of net dislocation density in a finite element model of a polycrystal aggregate. Finally, observations from simulations of de formation of the polycrystal aggregate are introduced into an existing macroscopic constitutive model for metal plasticity based on the mechanical threshold. (C) 2000 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved. C1 Univ Illinois, Dept Mech & Ind Engn, Urbana, IL 61801 USA. Univ Illinois, Ctr Simulat Adv Rockets, Urbana, IL 61801 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Beaudoin, AJ (reprint author), Univ Illinois, Dept Mech & Ind Engn, 354 MEB,MB 244,1206 W Green St, Urbana, IL 61801 USA. RI Acharya, Amit/A-4706-2010; Albe, Karsten/F-1139-2011 OI Acharya, Amit/0000-0002-6184-3357; NR 58 TC 79 Z9 79 U1 2 U2 21 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 1359-6454 J9 ACTA MATER JI Acta Mater. PD AUG 1 PY 2000 VL 48 IS 13 BP 3409 EP 3423 DI 10.1016/S1359-6454(00)00136-1 PG 15 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA 352CL UT WOS:000089196900013 ER PT J AU Danielson, KT Uras, RA Adley, MD Li, S AF Danielson, KT Uras, RA Adley, MD Li, S TI Large-scale application of some modern CSM methodologies by parallel computation SO ADVANCES IN ENGINEERING SOFTWARE LA English DT Article; Proceedings Paper CT 5th NASA National Symposium on Large-Scale Analysis, Design and Intelligent Synthesis Environments CY OCT 12-15, 1999 CL WILLIAMSBURG, VIRGINIA SP NASA DE parallel computing; finite elements; meshfree methods; reproducing kernel particle methods; large deformation; inelasticity; explicit dynamics ID KERNEL PARTICLE METHODS; MICROPLANE MODEL; CONCRETE AB In this paper, the authors demonstrate the significant benefits that High Performance Computing has provided for several large-scale applications of some modern Computational Structural Mechanics (CSM) methodologies. Large complex dynamic analyses, involving large strain/deformation and inelasticity, were reasonably performed by parallel processing with recent constitutive models and modern computational techniques. The predictions were made with finite element and mesh-free method software developed by the authors, using Message Passing interface on GRAY T3E and IBM SP platforms. Excellent scalability on hundreds of processors was attained, which demonstrated the large-scale viability of the methodologies and greatly improved the authors' research and development productivity, (C) 2000 Elsevier Science Ltd. All rights reserved. C1 USA, Engineer Res & Dev Ctr, Waterways Expt Stn, Vicksburg, MS 39180 USA. Northwestern Univ, Mech Engn & Army High Performance Comp Res Ctr, Evanston, IL 60208 USA. USA, Engineer Res & Dev Ctr, Waterways Expt Stn, Vicksburg, MS 39180 USA. Argonne Natl Lab, Reactor Engn Div, Argonne, IL 60439 USA. RP Danielson, KT (reprint author), USA, Engineer Res & Dev Ctr, Waterways Expt Stn, 3909 Halls Ferry Rd,CEERD-SD-R, Vicksburg, MS 39180 USA. RI Li, Shaofan/G-8082-2011 OI Li, Shaofan/0000-0002-6950-1474 NR 28 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0965-9978 J9 ADV ENG SOFTW JI Adv. Eng. Softw. PD AUG-SEP PY 2000 VL 31 IS 8-9 BP 501 EP 509 DI 10.1016/S0965-9978(00)00033-8 PG 9 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering; Engineering, Multidisciplinary SC Computer Science; Engineering GA 346MR UT WOS:000088876100002 ER PT J AU Howe, SD AF Howe, SD TI Nuclear rocket to Mars SO AEROSPACE AMERICA LA English DT Article C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Howe, SD (reprint author), Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 USA SN 0740-722X J9 AEROSPACE AM JI Aerosp. Am. PD AUG PY 2000 VL 38 IS 8 BP 39 EP 43 PG 5 WC Engineering, Aerospace SC Engineering GA 340RC UT WOS:000088547700014 PM 11543295 ER PT J AU Donnelly, A Jones, MB Burke, JI Schnieders, B AF Donnelly, A Jones, MB Burke, JI Schnieders, B TI Elevated CO2 provides protection from O-3 induced photosynthetic damage and chlorophyll loss in flag leaves of spring wheat (Triticum aestivum L., cv. 'Minaret') SO AGRICULTURE ECOSYSTEMS & ENVIRONMENT LA English DT Article DE elevated CO2; elevated O-3; chlorophyll; gas exchange; Triticum aestivum; Ireland ID ATMOSPHERIC CO2; CARBON-DIOXIDE; WINTER-WHEAT; LEAF SENESCENCE; STOMATAL CONDUCTANCE; TIME-CONCENTRATION; PLANT-RESPONSES; AIR-POLLUTANTS; GAS-EXCHANGE; WATER-USE AB Spring wheat (Triticum aestivum L., cv. 'Minaret') was grown in open-top chambers and exposed to two CO2 concentrations (ambient and 680 ppmv) and two O-3 concentrations (ambient and ambient +50 or +90 ppbv) either from anthesis onwards or for the entire growing season. The aim of the experiment was to test whether elevated CO2 could provide 'protection' to the crop against the damaging effects of elevated O-3 on flag leaf chlorophyll content and photosynthetic activity. The decline in flag leaf chlorophyll content following anthesis was unaffected by elevated CO2. However, the reduction in chlorophyll content brought about by elevated O-3 was less in elevated compared with ambient CO2. The rate of flag leaf photosynthesis was increased in elevated CO2 and decreased in elevated O-3. When elevated CO2 and elevated O-3 were combined the decrease attributed to O-3 was smaller than in elevated O-3 at ambient CO2. These results confirm that elevated CO2 provides some protection to a wheat crop against the damaging effects of O-3 on photosynthetic activity and chlorophyll content. However, the degree of protection varies between growing seasons and also appears to be related to the timing of exposure to elevated O-3. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Univ Dublin Trinity Coll, Dept Bot, Dublin 2, Ireland. Oak Pk Res Ctr, Agr & Food Dev Author, TEAGASC, Carlow, Ireland. RP Donnelly, A (reprint author), Univ Nottingham, Sch Biol Sci, Div Environm Sci, Sutton Bonington Campus, Loughborough LE12 5RD, Leics, England. NR 45 TC 22 Z9 30 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8809 J9 AGR ECOSYST ENVIRON JI Agric. Ecosyst. Environ. PD AUG PY 2000 VL 80 IS 1-2 BP 159 EP 168 DI 10.1016/S0167-8809(00)00137-7 PG 10 WC Agriculture, Multidisciplinary; Ecology; Environmental Sciences SC Agriculture; Environmental Sciences & Ecology GA 343AC UT WOS:000088678700012 ER PT J AU Pfund, D Rector, D Shekarriz, A Popescu, A Welty, J AF Pfund, D Rector, D Shekarriz, A Popescu, A Welty, J TI Pressure drop measurements in a microchannel SO AICHE JOURNAL LA English DT Article ID FLOW AB Recent developments in micro-energy and micro-chemical systems have produced a need for greater understanding of flow in small channels. Several recent studies of friction factors and transition Reynolds numbers in rectangular microchannels have produced results that differ from classical theory. In this work, friction factors and laminar flow friction constants were determined for water flowing in high aspect ratio channels with depths ranging from 128 to 521 mu m. Reynolds numbers were between 60 and 3,450 Pressure drops were measured within the channel itself to exclude entrance and exit losses. Transitions to turbulence were observed with flow visualization. Uncertainties in measured variables were quantified and propagated into the estimated friction constants. Friction factors were also determined in a 1,050-mu m-deep channel that served ns a control After considering experimental uncertainties and systematic errors, significant differences remained between the results and classical theory. C1 Pacific NW Lab, Richland, WA 99352 USA. Oregon State Univ, Dept Engn Mech, Corvallis, OR 97331 USA. RP Pacific NW Lab, POB 999, Richland, WA 99352 USA. RI Popescu, Aristotel/C-7428-2015; OI Popescu, Aristotel/0000-0002-5327-035X NR 20 TC 139 Z9 150 U1 3 U2 29 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0001-1541 EI 1547-5905 J9 AICHE J JI AICHE J. PD AUG PY 2000 VL 46 IS 8 BP 1496 EP 1507 DI 10.1002/aic.690460803 PG 12 WC Engineering, Chemical SC Engineering GA 343NU UT WOS:000088709100002 ER PT J AU Edwards, AL Sharitz, RR AF Edwards, AL Sharitz, RR TI Population genetics of two rare perennials in isolated wetlands: Sagittaria isoetiformis and S-teres (Alismataceae) SO AMERICAN JOURNAL OF BOTANY LA English DT Article DE Alismataceae; allozymes; habitat isolation; progenitor-derivative; Sagittaria isoetiformis; Sagittaria teres ID F-STATISTICS; SEED-BANK; SUBDIVIDED POPULATIONS; ISLAND POPULATIONS; ASCLEPIAS-EXALTATA; COASTAL-PLAIN; DIFFERENTIATION; DIVERSITY; DISTANCE; CAROLINA AB We investigated genetic structure in two closely related perennial plants that occur in isolated wetlands: Sagittaria isoetiformis, restricted to the southeastern Coastal Plain of North America, and S. teres, endemic to the northeastern Coastal Plain. Using horizontal starch-gel electrophoresis, we screened 527 individuals from Il populations of S. isoetiformis and 367 individuals from seven populations of S, teres. A high proportion of the 16 loci were polymorphic (%P-s = 93.8% in S. isoetiformis and %P-s = 75.0% in S. teres), with higher mean numbers of alleles per polymorphic locus and effective alleles per locus in S. isoeriformis (AP = 3.27, A(E) = 1.90) than in S. teres (AP = 2.58, A(H) = 1.30). Species- and population-level expected heterozygosities were higher in S. isoetiformis (H-ES = 0.399, H-EP = 0.218) than in S. teres (H-ES = 0.177, H-EP = 0.101). Jackkinife estimates of F statistics indicated moderate levels of inbreeding in S. teres ((F) over cap(ts) = 23.1%). Strong differentiation characterized these geographically isolated populations (G(ST) = 39.9% in S. isoetiformis, and G(ST), = 26.1% in S. teres). Genetic identities varied substantially within ((I) over bar = 75%, range = 0.558-0.963 in S. isoetiformis (I) over bar = 89%, range = 0.776-0.963 in S. teres) and among species ((I) over bar = 81%, range = 0.506-0.882), leading to the discrimination of four regional population clusters using nonmetric multidimensional scaling (NMDS). It appears that S. isoetiformis and S. teres are a progenitor-derivative species pair. C1 Savannah River Ecol Lab, Aiken, SC 29802 USA. Univ Georgia, Dept Bot, Athens, GA 30602 USA. RP Sharitz, RR (reprint author), Savannah River Ecol Lab, Drawer E, Aiken, SC 29802 USA. NR 90 TC 33 Z9 39 U1 0 U2 2 PU BOTANICAL SOC AMER INC PI COLUMBUS PA OHIO STATE UNIV-DEPT BOTANY 1735 NEIL AVE, COLUMBUS, OH 43210 USA SN 0002-9122 J9 AM J BOT JI Am. J. Bot. PD AUG PY 2000 VL 87 IS 8 BP 1147 EP 1158 DI 10.2307/2656651 PG 12 WC Plant Sciences SC Plant Sciences GA 345WH UT WOS:000088837800009 PM 10947999 ER PT J AU Chandler, DP Stults, JR Anderson, KK Cebula, S Schuck, BL Brockman, FJ AF Chandler, DP Stults, JR Anderson, KK Cebula, S Schuck, BL Brockman, FJ TI Affinity capture and recovery of DNA at femtomolar concentrations with peptide nucleic acid probes SO ANALYTICAL BIOCHEMISTRY LA English DT Article ID STRAND INVASION; PNA; PCR; HYBRIDIZATION; PURIFICATION; INHIBITION; OLIGONUCLEOTIDES; MICROBIOLOGY; COMPLEXES; STABILITY AB The efficacy of PNA vs DNA oligomers for the recovery of femtomolar concentrations of 16S rDNA targets was determined with solution- and mixed-phase hybridization formats and limiting dilution quantitative PCR. Several results contradict existing perceptions of expected PNA behavior deduced from hybridization studies with oligonucleotide targets at high concentration. For example, DNA probes in the solution hybridization format performed as well as or better than PNA probes under high- or low-salt conditions, regardless of hybridization time or target size. In the mixed-phase hybridization format, however, PNA probes showed certain advantages, with more rapid and efficient binding/recovery of target nucleic acids regardless of target size. Recovery of target DNA with PNA probes was always more efficient in low-salt (20 mM in Na+) than high-salt (400 mM in Na+-) phosphate buffer. Recovery of target DNA by PNA probes was enhanced in the presence of excess, nontarget DNA, and differences in PNA efficacy under low- or high-salt conditions vanquished. In contrast, DNA probe performance was unaffected by the presence or absence of exogenous DNA in both solution- and mixed-phase hybridization formats. The absolute recovery and detection limit of the affinity purification method with either DNA or PNA probes was approximately 10(2) input target molecules at zeptamolar concentrations. (C) 2000 Academic Press. C1 Pacific NW Natl Lab, Environm Microbiol Grp, Richland, WA 99352 USA. Pacific NW Natl Lab, Stat Resources Grp, Richland, WA 99352 USA. RP Chandler, DP (reprint author), Pacific NW Natl Lab, Environm Microbiol Grp, Mail Stop P7-50, Richland, WA 99352 USA. OI Anderson, Kevin/0000-0001-5613-5893 NR 30 TC 16 Z9 16 U1 0 U2 1 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0003-2697 J9 ANAL BIOCHEM JI Anal. Biochem. PD AUG 1 PY 2000 VL 283 IS 2 BP 241 EP 249 DI 10.1006/abio.2000.4637 PG 9 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA 341KB UT WOS:000088588600016 PM 10906245 ER PT J AU Ermakov, SV Jacobson, SC Ramsey, JM AF Ermakov, SV Jacobson, SC Ramsey, JM TI Computer simulations of electrokinetic injection techniques in microfluidic devices SO ANALYTICAL CHEMISTRY LA English DT Article ID CAPILLARY ELECTROPHORESIS; GLASS CHIP; MICROCHIP; ELECTROSPRAY AB Computer simulations are used to study electrokinetic injections on microfluidic devices (microchips). The gated and pinched injection techniques are considered. Each injection technique uses a unique sequence of steps with different electric field distributions and field magnitudes irm the channels to effectuate a virtual valve. The goal of these computer simulations is to identify operating parameters providing optimal valve performance. In the pinched injection, the conditions of both loading and dispensing steps were analyzed to reach a compromise between the sample plug spatial extent and its concentration. For the gated injection, the condition of leakage free valve operation was found for the sample loading step. The simulation results for the gated valve are compared with experimental data. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Ramsey, JM (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA. NR 16 TC 166 Z9 167 U1 6 U2 25 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD AUG 1 PY 2000 VL 72 IS 15 BP 3512 EP 3517 DI 10.1021/ac991474n PG 6 WC Chemistry, Analytical SC Chemistry GA 340EP UT WOS:000088520400036 ER PT J AU Munoz-Cobo, JL Perez, RB Valentine, TE Rugama, Y Mihalczo, JT AF Munoz-Cobo, JL Perez, RB Valentine, TE Rugama, Y Mihalczo, JT TI A stochastic transport theory of neutron and photon coupled fields: neutron and photon counting statistics in nuclear assemblies SO ANNALS OF NUCLEAR ENERGY LA English DT Article AB The behavior of neutrons and gamma rays in a nuclear reactor or configuration of fissile material can be represented as a stochastic process. The observation of this stochastic process is usuary achieved by measuring the fluctuations of the neutron and gamma ray population on the system. The general theory of the stochastic neutron field has been developed to a high degree. However, the theory of the stochastic nature of the gamma rays and neutrons couples the two processes. The generalized probability balances are developed from which the first and higher moments of the neutron and gamma rays fields are obtained. The paper also provides a description of the probability generating functions for both photon and neutron detectors that are the foundations for measurements of the fluctuations. The formalism developed in this paper for the representation of the statistical descriptors of the neutron-photon coupled field is applicable for many neutron noise analysis measurements. (C) 2000 Elsevier Science Ltd. All rights reserved. C1 Univ Politecn Valencia, Dept Chem & Nucl Engn, E-46071 Valencia, Spain. Oak Ridge Natl Lab, Div Instrumentat & Controls, Oak Ridge, TN 37831 USA. RP Munoz-Cobo, JL (reprint author), Univ Politecn Valencia, Dept Chem & Nucl Engn, POB 22012, E-46071 Valencia, Spain. OI Munoz-Cobo, Jose-Luis/0000-0002-4512-7991 NR 13 TC 8 Z9 8 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0306-4549 J9 ANN NUCL ENERGY JI Ann. Nucl. Energy PD AUG PY 2000 VL 27 IS 12 BP 1087 EP 1114 DI 10.1016/S0306-4549(99)00107-3 PG 28 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 318DF UT WOS:000087268100004 ER PT J AU Gressier, V Naberejnev, DG Mounier, C AF Gressier, V Naberejnev, DG Mounier, C TI The impact of the harmonic crystal model on the neutron resonance parameters of Np-237 SO ANNALS OF NUCLEAR ENERGY LA English DT Article AB Recently, it was emphasized once again that the use of the free gas model instead of the harmonic crystal model at the experimental analysis stage, could introduce non-negligible errors in the deduced neutron resonance paramerters. In the present paper we will show how the use of the harmonic crystal moder can affect the resonance parameters of Np-237 bound in NpO2 when analysing the recent experimental data obtained at the GELINA* facility, Belgium. Further, using the harmonic crystal model at the experimental analysis stage, we will deduce a new set of improved resonance parameters of Np-237. (C) 2000 Elsevier Science Ltd. All rights reserved. C1 CEA Saclay, SPhN, DAPNIA, DSM, F-91191 Gif Sur Yvette, France. IRMM, JRC, CEC, B-2440 Geel, Belgium. Argonne Natl Lab, Technol Dev Div, Argonne, IL 60439 USA. CEA Saclay, LENR, SERMA, DMT,DRN, F-91191 Gif Sur Yvette, France. RP Gressier, V (reprint author), CEA Saclay, SPhN, DAPNIA, DSM, F-91191 Gif Sur Yvette, France. NR 25 TC 9 Z9 10 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0306-4549 J9 ANN NUCL ENERGY JI Ann. Nucl. Energy PD AUG PY 2000 VL 27 IS 12 BP 1115 EP 1129 DI 10.1016/S0306-4549(00)00016-5 PG 15 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 318DF UT WOS:000087268100005 ER PT J AU Chandler, DP Stults, JR Cebula, S Schuck, BL Weaver, DW Anderson, KK Egholm, M Brockman, FJ AF Chandler, DP Stults, JR Cebula, S Schuck, BL Weaver, DW Anderson, KK Egholm, M Brockman, FJ TI Affinity purification of DNA and RNA from environmental samples with peptide nucleic acid clamps SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY LA English DT Article ID POLYMERASE CHAIN-REACTION; DEEP-SUBSURFACE SEDIMENTS; RDNA CLONE LIBRARIES; STRAND DISPLACEMENT; QUANTITATIVE PCR; PNA; SOIL; BACTERIA; HYBRIDIZATION; INHIBITION AB Bispeptide nucleic acids (bis-PNAs; PNA clamps), PNA oligomers, and DNA oligonucleotides were evaluated as affinity purification reagents for subfemtomolar 16S ribosomal DNA (rDNA) and rRNA targets in soil, sediment, and industrial air filter nucleic acid extracts, Under low-salt hybridization conditions (10 mM NaPO4, 5 mill disodium EDTA, and 0.025% sodium dodecyl sulfate [SDS]) a PNA clamp recovered significantly more target DNA than either PNA or DNA oligomers. The efficacy of PNA clamps and oligomers was generally enhanced in the presence of excess nontarget DNA and in a low-salt extraction-hydridization buffer. Under high-salt conditions (200 mM NaPO4, 100 mM disodium EDTA, and 0.5% SDS), however, capture efficiencies with the DNA oligomer were significantly greater than with the PNA clamp and PNA oligomer. Recovery and detection efficiencies for target DNA concentrations of greater than or equal to 100 pg were generally >20% but depended upon the specific probe, solution background, and salt condition. The DNA probe had a Lower absolute detection limit of 100 fg of target (830 zM [1 zM = 10(-21) M] in high-salt buffer.. In the absence of exogenous DNA (e,g., soil background), neither the bis-PNA nor the PNA oligomer achieved the same absolute detection limit even under a more favorable low-salt hybridization condition. In the presence of a soil background, however, both PNA probes provided more sensitive absolute purification and detection (830 zM) than the DNA oligomer. In varied environmental samples, the rank order for capture probe performance in high-salt buffer was DNA > PNA > clamp. Recovery of 16S rRNA from environmental samples mirrored quantitative results for DNA target recovery. with the DNA oligomer generating more positive results than either the his-PNA or PNA oligomer, but PN;I probes provided a greater incidence of detection from environmental samples that also contained a higher concentration of nontarget DNA and RNA. Significant interactions between probe type and environmental sample indicate that the most efficacious capture system depends upon the particular sample type (and background nucleic acid concentration), target (DNA or RNA), and detection objective. C1 Pacific NW Natl Lab, Environm Microbiol Grp, Richland, WA 99352 USA. Pacific NW Natl Lab, Stat Resources Grp, Richland, WA 99352 USA. PerSept Biosyst, Framingham, MA 01710 USA. RP Chandler, DP (reprint author), Pacific NW Natl Lab, Environm Microbiol Grp, 900 Battelle Blvd,POB 999,Mail Stop P7-50, Richland, WA 99352 USA. OI Anderson, Kevin/0000-0001-5613-5893 NR 57 TC 28 Z9 30 U1 1 U2 3 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1752 N ST NW, WASHINGTON, DC 20036-2904 USA SN 0099-2240 J9 APPL ENVIRON MICROB JI Appl. Environ. Microbiol. PD AUG PY 2000 VL 66 IS 8 BP 3438 EP 3445 DI 10.1128/AEM.66.8.3438-3445.2000 PG 8 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA 340QP UT WOS:000088546300045 PM 10919804 ER PT J AU van Waasbergen, LG Balkwill, DL Crocker, FH Bjornstad, BN Miller, RV AF van Waasbergen, LG Balkwill, DL Crocker, FH Bjornstad, BN Miller, RV TI Genetic diversity among Arthrobacter species collected across a heterogeneous series of terrestrial deep-subsurface sediments as determined on the basis of 16S rRNA and recA gene sequences SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY LA English DT Article ID POLYMERASE CHAIN-REACTION; HETEROTROPHIC BACTERIA; PHYLOGENETIC ANALYSIS; RIBOSOMAL-RNA; MICROCOCCUS; PALEOSOL; WATER; BIOGEOCHEMISTRY; MICROBIOLOGY; POPULATIONS AB This study was undertaken in an effort to understand how the population structure of bacteria within terrestrial deep-subsurface environments correlates with the physical and chemical structure of their environment, Phylogenetic analysis was performed on strains of Arthrobacter that were collected from various depths, which included a number of different sedimentary units from the Yakima Barricade borehole at the U.S, Department of Energy's Hanford site, Washington, in August 1992, At the same time that bacteria mere isolated, detailed information on the physical, chemical, and microbiological characteristics of the sediments was collected, Phylogenetic trees were prepared from the 39 deep-subsurface Arthrobacter isolates las well as 17 related type strains) based on 16S rRNA and recA gene sequences. Analyses based an each gene independently were in general agreement. These analyses showed that, for all but one of the strata (sedimentary layers characterized by their own unifying lithologic composition), the deep-subsurface isolates from the same stratum are largely monophyletic. Notably, the layers for which this is true were composed of impermeable sediments, This suggests that the populations within each of these strata have remained isolated under constant, uniform conditions, which have selected for a particular dominant genotype in each stratum, Conversely, the few strains isolated from a gravel-rich Layer appeared along several lineages. This suggests that the higher-permeability gravel decreases the degree of isolation of this population (through greater groundwater how), creating fluctuations in environmental conditions or allowing migration, such that a dominant population has not been established. No correlation was seen between the relationship of the strains and any particular chemical or physical characteristics of the sediments. Thus, this work suggests that within sedimentary deep-subsurface environments, permeability of the deposits plays a major role in determining the genetic structure of resident bacterial populations. C1 Oklahoma State Univ, Stillwater, OK 74078 USA. Florida State Univ, Tallahassee, FL 32308 USA. Pacific NW Lab, Richland, WA 99352 USA. RP Miller, RV (reprint author), Oklahoma State Univ, 307 Life Sci E, Stillwater, OK 74078 USA. NR 52 TC 40 Z9 41 U1 0 U2 6 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1752 N ST NW, WASHINGTON, DC 20036-2904 USA SN 0099-2240 J9 APPL ENVIRON MICROB JI Appl. Environ. Microbiol. PD AUG PY 2000 VL 66 IS 8 BP 3454 EP 3463 DI 10.1128/AEM.66.8.3454-3463.2000 PG 10 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA 340QP UT WOS:000088546300047 PM 10919806 ER PT J AU Degueldre, C Triay, I Kim, JI Vilks, P Laaksoharju, M Miekeley, N AF Degueldre, C Triay, I Kim, JI Vilks, P Laaksoharju, M Miekeley, N TI Groundwater colloid properties: a global approach SO APPLIED GEOCHEMISTRY LA English DT Article ID SUSPENDED PARTICLES; TEST-SITE; TRANSPORT; SYSTEMS; AQUIFER AB This study presents and discusses groundwater colloid results from Various geological formations ranging from crystalline to sedimentary, from organic rich to organic poor systems and from subsurface to very deep aquifers. Colloid presence and their potential mobility are justified on the basis of colloid stability properties in the investigated groundwaters. The colloid concentration is a function of pH, redox potential, concentrations of Na, K, Ca, Mg and organic carbon, as well as the status of the chemical and physical steady state of the hydrogeochemical system. The colloid properties are discussed with a non-site specific approach. (C) 2000 Elsevier Science Ltd. All rights reserved. C1 Paul Scherrer Inst, CH-5232 Villigen, Switzerland. Univ Geneva, Ctr Sci Nat Environm, CH-1211 Geneva 4, Switzerland. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Forschungszentrum, Inst Nukl Entsorgungstech, Karlsruhe, Germany. Tech Univ Munich, Inst Radiochem, D-8000 Munich, Germany. Atom Energy Canada Ltd, Whiteshell Labs, Pinawa, MB R0E 1L0, Canada. Intera AB, S-19140 Sollentuna, Sweden. Pontificia Univ Catolica Rio de Janeiro, BR-22453 Rio De Janeiro, Brazil. RP Degueldre, C (reprint author), Paul Scherrer Inst, CH-5232 Villigen, Switzerland. NR 22 TC 72 Z9 74 U1 3 U2 22 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0883-2927 J9 APPL GEOCHEM JI Appl. Geochem. PD AUG PY 2000 VL 15 IS 7 BP 1043 EP 1051 DI 10.1016/S0883-2927(99)00102-X PG 9 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 318XA UT WOS:000087308900010 ER PT J AU Dahl, DA Atwood, CL LaViolette, RA AF Dahl, DA Atwood, CL LaViolette, RA TI A random-walk pseudorandom byte generator SO APPLIED MATHEMATICAL MODELLING LA English DT Article DE random numbers; stochastic simulation; Monte Carlo ID RANDOM-NUMBER GENERATORS; MONTE-CARLO SIMULATIONS; ERRORS AB A pseudorandom byte generator is constructed that employs a random walk on a 256 x 256 lattice of bytes that is in turn constructed from the permutations of all bytes. The generator is easily implemented, passes important empirical tests, and provides an alternative to commonly employed generators. (C) 2000 Elsevier Science Inc. All rights reserved. C1 Idaho Natl Enng & Environm Lab, Idaho Falls, ID 83415 USA. RP LaViolette, RA (reprint author), Idaho Natl Enng & Environm Lab, POB 1625, Idaho Falls, ID 83415 USA. NR 14 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 USA SN 0307-904X J9 APPL MATH MODEL JI Appl. Math. Model. PD AUG PY 2000 VL 24 IS 10 BP 771 EP 778 DI 10.1016/S0307-904X(00)00023-8 PG 8 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications; Mechanics SC Engineering; Mathematics; Mechanics GA 335RJ UT WOS:000088258200006 ER PT J AU Herron, IH Clark, AD AF Herron, IH Clark, AD TI Instabilities in the Gortler model for wall bounded flows SO APPLIED MATHEMATICS LETTERS LA English DT Article DE Gortler; vortices; instability ID VORTICES; STABILITIES; EXCHANGE AB The original Gortler model is analyzed with no-slip boundary conditions on the wall. These conditions have historically been the most difficult to treat. It is proved that the principle of exchange of stabilities holds, that is, the first unstable eigenvalue has imaginary part equal to zero. The techniques used involve factoring positive operators. (C) 2000 Elsevier Science Ltd. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. RP Herron, IH (reprint author), Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, MS-B258, Los Alamos, NM 87545 USA. NR 14 TC 3 Z9 3 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0893-9659 J9 APPL MATH LETT JI Appl. Math. Lett. PD AUG PY 2000 VL 13 IS 6 BP 105 EP 110 DI 10.1016/S0893-9659(00)00063-X PG 6 WC Mathematics, Applied SC Mathematics GA 341AD UT WOS:000088568100019 ER PT J AU Monteiro, OR Mammana, VP Salvadori, MC Ager, JW Dimitrijevic, S AF Monteiro, OR Mammana, VP Salvadori, MC Ager, JW Dimitrijevic, S TI Microstructure and electron emission properties of films prepared from single-wall and multi-wall nanotubes containing powders SO APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING LA English DT Article ID CARBON NANOTUBES; FIELD-EMISSION; EMITTERS; TUBES AB The microstructure and field emission properties of films prepared from commercial powders of single-wall and multi-wall carbon nanotube films were investigated. In addition to nanotubes, these materials contained amorphous and crystalline carbon phases, and the single-wall powder also contained nano-particles of the Fe-Co catalysts. The turn-on fields were measured to be 2.3 V mum(-1) for films prepared with the material containing single-wall nanotubes and 2.6 V mum(-1) for those with multi-wall nanotubes. Long-term stability of emission current for these films was also investigated and correlated to their microstructure. Single-wall material showed a decrease in emission current that extended over several days and that was related to permanent degradation of emission sites. Emission current From the multi-wall material stabilized after an initial increase. C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Univ Sao Paulo, Inst Fis, BR-05315 Sao Paulo, Brazil. MER Corp, Tucson, AZ 85706 USA. RP Monteiro, OR (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. EM ORMonteiro@lbl.gov RI Salvadori, Maria Cecilia/A-9379-2013; OI Ager, Joel/0000-0001-9334-9751 NR 20 TC 17 Z9 17 U1 0 U2 1 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0947-8396 EI 1432-0630 J9 APPL PHYS A-MATER JI Appl. Phys. A-Mater. Sci. Process. PD AUG PY 2000 VL 71 IS 2 BP 121 EP 124 PG 4 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA 401JP UT WOS:000166924700001 ER PT J AU Partridge, WP Laurendeau, NM AF Partridge, WP Laurendeau, NM TI Experimentally based correction procedures for planar laser-induced fluorescence measurements of mean species concentration SO APPLIED PHYSICS B-LASERS AND OPTICS LA English DT Article ID NITRIC-OXIDE; PREMIXED FLAMES; LAMINAR AB Experimentally-based correction procedures are demonstrated which enhance the quantitative nature of planar laser-induced fluorescence (PLIF) images for mean species concentration by correcting for the influence of the electronic quenching rate coefficient. Implementation of these methods requires only the ability to make PLIF and laser-saturated fluorescence (LSF) measurements. Though applied herein to NO, these procedures are broadly applicable both in terms of species and users. Moreover, they are generally effective regardless of the error gradients associated with spatial variations in the electronic quenching rate coefficient. In such general environments, these methods produce quenching-corrected, spatially resolved PLIF images of mean species concentration with a total uncertainty equivalent to that of a single LSF measurement. C1 Purdue Univ, Sch Mech Engn, Flame Diagnosis Lab, W Lafayette, IN 47907 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Purdue Univ, Sch Mech Engn, W Lafayette, IN 47907 USA. RP Partridge, WP (reprint author), Purdue Univ, Sch Mech Engn, Flame Diagnosis Lab, W Lafayette, IN 47907 USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER-VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 0946-2171 J9 APPL PHYS B-LASERS O JI Appl. Phys. B-Lasers Opt. PD AUG PY 2000 VL 71 IS 2 BP 237 EP 245 PG 9 WC Optics; Physics, Applied SC Optics; Physics GA 339CP UT WOS:000088460300017 ER PT J AU Small, JR Foster, NS Amonette, JE Autrey, T AF Small, JR Foster, NS Amonette, JE Autrey, T TI Listening to colloidal silica samples: Simultaneous measurement of absorbed and scattered light using pulsed-laser photoacoustics SO APPLIED SPECTROSCOPY LA English DT Article DE photoacoustics; light scattering; optical turbidity; colloidal silica; fluorescence ID FLUORESCENCE QUANTUM YIELDS; PROTON-TRANSFER; VOLUME CHANGES; TURBID MEDIA; SPECTROSCOPY; TIME; CALORIMETRY; ABSORPTION; WATER; CELLS AB Laser photoacoustic spectroscopy (LPAS) has been used to simultaneously measure scattered light and absorbed light with the use of a single piezoelectric transducer detector. Samples of Ludox(TM) colloidal silica, with and without added potassium chromate, were illuminated with pulses of 308 or 355 nm light. Signals were measured with a 1 MHz ultrasonic transducer clamped to the side of the cuvette. The resulting oscilloscope tracing shows a pattern of signals originating from light scatter and light absorption that is consistent with experimental geometry and the speeds of light and sound, and linear with incident laser pulse energy. The absorbed light signals are independent of the distance of the laser beam from the transducer, while the scattered light signals are strongly distance-dependent. The absorbed light signals are more indicative of true sample absorbance than are readings from a standard spectrophotometer. A spectrophotometer sums contributions from scattering and absorbance to give an optical density reading, while LPAS separates scattering from absorbance to give quantitative information on each function. Scattered light and fluorescent light behave very similarly in the LPAS technique. Our experiments were done with well-characterized colloidal silica samples, but the technique is readily extended to larger, more heterogeneous, and photochemically complex biological and environmental samples. C1 Eastern Washington Univ, Dept Chem & Biochem, Cheney, WA 99004 USA. Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. RP Eastern Washington Univ, Dept Chem & Biochem, 226 SCI,526 5th St, Cheney, WA 99004 USA. NR 47 TC 9 Z9 9 U1 0 U2 2 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 USA SN 0003-7028 EI 1943-3530 J9 APPL SPECTROSC JI Appl. Spectrosc. PD AUG PY 2000 VL 54 IS 8 BP 1142 EP 1150 DI 10.1366/0003702001950940 PG 9 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA 348FQ UT WOS:000088975200006 ER PT J AU Lewis, C Doorn, SK Wayne, DM King, FL Majidi, V AF Lewis, C Doorn, SK Wayne, DM King, FL Majidi, V TI Characterization of a pulsed glow discharge laser ablation system using optical emission SO APPLIED SPECTROSCOPY LA English DT Article DE glow discharge; laser ablation ID PLASMA-MASS-SPECTROMETRY; PLUME; PROFILES; ATOMS; IONIZATION; CU AB Investigations involving laser-based sampling of copper into an auxiliary pulsed glow discharge for ionization and excitation are presented. The interaction of the ablated copper with the auxiliary glow discharge was studied by monitoring the copper atom emission signal at 368.744 nm. Results demonstrate the ability to time ablation appropriately to access specific temporal regions of the pulsed plasma. More specifically, laser-ablated material was introduced into the glow discharge negative glow during the afterpeak, Ionization and excitation was accomplished by collisions with a metastable argon population produced by the glow discharge (Penning ionization) followed by recombination to yield excited-state Cu atoms, The work presented investigates parameters that affect the atomic emission signal intensity of the ablated material, including cathode-to-target distance, discharge gas pressure, and relative timing of discharge and ablation, Results demonstrate that decreasing the glow discharge working gas pressure increases the transport efficiency of laser-ablated material into the negative glow. These investigations are part of an ongoing series of studies on sample introduction schemes that utilize different ionization and excitation mechanisms found in pulsed glow discharge plasmas. C1 Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Nucl Mat & Technol Div, Los Alamos, NM 87545 USA. W Virginia Univ, Dept Chem, Morgantown, WV 26505 USA. RP Doorn, SK (reprint author), Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, CST-9, Los Alamos, NM 87545 USA. NR 34 TC 14 Z9 14 U1 0 U2 2 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 201B BROADWAY ST, FREDERICK, MD 21701 USA SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD AUG PY 2000 VL 54 IS 8 BP 1236 EP 1244 DI 10.1366/0003702001950823 PG 9 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA 348FQ UT WOS:000088975200019 ER PT J AU Galli, G Pizzagalli, L Catellani, A Gygi, F Baratoff, A AF Galli, G Pizzagalli, L Catellani, A Gygi, F Baratoff, A TI Physical properties of cubic SiC(001) surfaces from first-principles simulations SO APPLIED SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 5th International Conference on Atomic Controlled Surfaces, Interfaces and Nanostructures (ACSIN 5) CY JUL 06-09, 1999 CL UNIV AIX MARSEILLE, AIX PROVENCE, FRANCE HO UNIV AIX MARSEILLE DE silicon carbide; surface; reconstruction; ab-initio methods ID SOFT-X-RAY; RECONSTRUCTED 3C-SIC(001) SURFACES; TERMINATED BETA-SIC(100) SURFACE; ASYMMETRIC-DIMER RECONSTRUCTION; ENERGY ELECTRON-DIFFRACTION; ATOMIC-STRUCTURE; SPECTROSCOPY; GROWTH; PHASE AB We report the results of first-principles molecular dynamics simulations of the physical properties of cubic SiC(001) surfaces. In particular, we discuss the atomic geometries of several reconstructions, including (2 x I), c(4 x 2) and (3 x 2), and compare computed STM images with recent experimental. results. (C) 2000 Published by Elsevier Science B.V. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. CNR, MASPEC, I-43010 Parma, Italy. Univ Basel, Dept Phys & Astron, CH-4056 Basel, Switzerland. RP Galli, G (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94550 USA. RI Pizzagalli, Laurent/A-1445-2013; OI Catellani, Alessandra/0000-0001-5197-7186 NR 47 TC 7 Z9 7 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-4332 J9 APPL SURF SCI JI Appl. Surf. Sci. PD AUG PY 2000 VL 162 BP 1 EP 8 DI 10.1016/S0169-4332(00)00162-8 PG 8 WC Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Chemistry; Materials Science; Physics GA 347WK UT WOS:000088952000002 ER PT J AU Hopkins, WA Snodgrass, JW Roe, JH Jackson, BP Gariboldi, JC Congdon, JD AF Hopkins, WA Snodgrass, JW Roe, JH Jackson, BP Gariboldi, JC Congdon, JD TI Detrimental effects associated with trace element uptake in lake chubsuckers (Erimyzon sucetta) exposed to polluted sediments SO ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY LA English DT Article ID TROUT SALMO-GAIRDNERI; COAL COMBUSTION WASTE; STANDARD METABOLIC-RATE; RAINBOW-TROUT; RANA-CATESBEIANA; BUFO-TERRESTRIS; ORAL DEFORMITIES; CHINOOK SALMON; SOUTHERN TOADS; SELENIUM AB Lake chubsuckers (Erimyzon sucetta) were exposed to coal ash-polluted sediments under conservative experimental conditions (filtered artificial soft water and abundant uncontaminated food). After 4 months of exposure, fish grazing the polluted sediments had significantly elevated body burdens of Se, Sr, and V. Selenium levels were particularly elevated, reaching mean whole body concentrations of 5.6 mu g/g dry mass by the end of experimental manipulations. Twenty-five percent of fish exposed to pollutants died during the study. All surviving fish exposed to ash exhibited substantial decreases in growth and severe fin erosion. Total nonpolar lipids were two times higher in fish from the control treatment, but percent lipid did not differ between treatments. Because fish were presented with the same amount of food during the study, it appears fish exposed to ash utilized more energy for daily activities and/or were less efficient at converting available energy to tissues for growth and storage. The results were particularly interesting because we were unable to detect differences in standard metabolic rate (SMR) of fish between treatments. Increased energy expenditures not detectable in estimates of maintenance based on SMR, such as costs of digestion or activity, may have contributed to decreased energetic efficiency. Our findings corroborate previous studies which have documented the toxicity of ash-derived pollutants in fish. C1 Savannah River Ecol Lab, Columbia, SC 29208 USA. Univ S Carolina, Dept Biol Sci, Columbia, SC 29208 USA. Towson Univ, Dept Biol, Towson, MD 21252 USA. RP Hopkins, WA (reprint author), Savannah River Ecol Lab, Columbia, SC 29208 USA. RI Snodgrass, Joel/C-5288-2016 NR 35 TC 19 Z9 19 U1 2 U2 9 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 0090-4341 J9 ARCH ENVIRON CON TOX JI Arch. Environ. Contam. Toxicol. PD AUG PY 2000 VL 39 IS 2 BP 193 EP 199 PG 7 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA 332LW UT WOS:000088076600008 PM 10871422 ER PT J AU Rejkuba, M Minniti, D Gregg, MD Zijlstra, AA Alonso, MV Goudfrooij, P AF Rejkuba, M Minniti, D Gregg, MD Zijlstra, AA Alonso, MV Goudfrooij, P TI Deep Hubble Space Telescope STIS color-magnitude diagrams of the dwarf irregular galaxy WLM: Detection of the horizontal branch SO ASTRONOMICAL JOURNAL LA English DT Article DE galaxies : individual (WLM = DDO 221=A2359-1544=UGCA 444); galaxies : irregular; galaxies : stellar content; Local Group ID RED GIANT BRANCH; GLOBULAR-CLUSTER; LOCAL GROUP; NEARBY GALAXIES; POPULATIONS; METALLICITY; PHOTOMETRY; DISTANCE; STARS; HALOS AB We have obtained V- and I-band photometry for 1886 stars down to I = 27 and y = 28 in the held of the dwarf irregular galaxy WLM, using deep Space Telescope Imaging Spectrograph (STIS) CL- and LP-band images taken in the parallel mode with the Hubble Space Telescope. The photometry is used to study the horizontal branch identified in WLM. The horizontal branch, extending blueward from the red giant clump, is an unambiguous signature of an old population. We demonstrate that it is possible to reach the horizontal branch of an old population at a distance of similar or equal to 1 Mpc using STIS, with relatively short exposure times. From the VI color-magnitude diagram, we obtain an accurate distance modulus (m - M)(0) = 24.95 +/- 0.13 for WLM by using the Y magnitude of the horizontal branch, and by adopting E(V-I)= 0.03. The implications are that (1) WLM formed stars at high redshift and (2) the old population of WLM can be representative of a protogalactic fragment, related to those accreted to form the Milky Way halo. C1 European So Observ, D-85748 Garching, Germany. Pontificia Univ Catolica Chile, Dept Astron & Astrofis, Santiago 22, Chile. Univ Calif Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. Univ Calif Davis, Dept Phys, Davis, CA 95616 USA. UMIST, Dept Phys, Manchester M60 1QD, Lancs, England. Observ Astron Cordoba, Cordoba, Argentina. Space Telescope Sci Inst, Baltimore, MD 21218 USA. European Space Agcy, Dept Space Sci, Div Astrophys, F-75738 Paris 15, France. RP Rejkuba, M (reprint author), European So Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany. NR 34 TC 39 Z9 39 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 SOUTH WOODLAWN AVE, CHICAGO, IL 60637-1603 USA SN 0004-6256 J9 ASTRON J JI Astron. J. PD AUG PY 2000 VL 120 IS 2 BP 801 EP 809 DI 10.1086/301501 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 349HZ UT WOS:000089040800023 ER PT J AU Ivezic, Z Goldston, J Finlator, K Knapp, GR Yanny, B McKay, TA Amrose, S Krisciunas, K Willman, B Anderson, S Schaber, C Erb, D Logan, C Stubbs, C Chen, B Neilsen, E Uomoto, A Pier, JR Fan, XH Gunn, JE Lupton, RH Rockosi, CM Schlegel, D Strauss, MA Annis, J Brinkmann, J Csabai, I Doi, M Fukugita, M Hennessy, GS Hindsley, RB Margon, B Munn, JA Newberg, HJ Schneider, DP Smith, JA Szokoly, GP Thakar, AR Vogeley, MS Waddell, P Yasuda, N York, DG AF Ivezic, Z Goldston, J Finlator, K Knapp, GR Yanny, B McKay, TA Amrose, S Krisciunas, K Willman, B Anderson, S Schaber, C Erb, D Logan, C Stubbs, C Chen, B Neilsen, E Uomoto, A Pier, JR Fan, XH Gunn, JE Lupton, RH Rockosi, CM Schlegel, D Strauss, MA Annis, J Brinkmann, J Csabai, I Doi, M Fukugita, M Hennessy, GS Hindsley, RB Margon, B Munn, JA Newberg, HJ Schneider, DP Smith, JA Szokoly, GP Thakar, AR Vogeley, MS Waddell, P Yasuda, N York, DG CA SDSS Collaboration TI Candidate RR Lyrae stars found in Sloan Digital Sky Survey commissioning data SO ASTRONOMICAL JOURNAL LA English DT Article DE Galaxy : halo; Galaxy : stellar content; Galaxy : structure; RR Lyrae variable ID GALACTIC HALO; BLUE STRAGGLERS; VARIABLE-STARS; SYSTEM; PHOTOMETRY; KINEMATICS; MAGNITUDE; OBJECTS; GALAXY AB We present a sample of 148 candidate RR Lyrae stars selected from Sloan Digital Sky Survey (SDSS) commissioning data for about 100 deg(2) of sky surveyed twice with Delta t = 1.9946 days. Although the faint-magnitude limit of the SDSS allows us to detect RR Lyrae stars to large Galactocentric distances (similar to 100 kpc, or r* similar to 21), we find no candidates fainter than r* similar to 20, i.e., farther than similar to 65 kpc from the Galactic center. On the assumption that all 148 candidates are indeed RR Lyrae stars (contamination by other species of variable star is probably less than 10%), we find that their volume density has roughly a power-law dependence on Galactocentric radius, R(-2.7+/-0.2), between 10 and 50 kpc and drops abruptly at R similar to 50-60 kPc, possibly indicating a sharp edge to the stellar halo as traced by RR Lyrae stars. The Galactic distribution of stars in this sample is very inhomogeneous and shows a clump of over 70 stars at about 45 kpc from the Galactic center. This clump is also detected in the distribution of nonvariable objects with RR Lyrae star colors. When sources in the clump are excluded, the best power-law fit becomes consistent with the R(-3) distribution found from surveys of bright RR Lyrae stars. These results imply that the halo contains clumpy overdensities inhomogeneously distributed within a smooth R-3 background, with a possible cutoff at similar to 50 kpc. C1 Princeton Univ Observ, Princeton, NJ 08544 USA. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA. Univ Washington, Dept Astron, Seattle, WA 98195 USA. Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA. USN Observ, Flagstaff Stn, Flagstaff, AZ 86002 USA. Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA. Apache Point Observ, Sunspot, NM 88349 USA. Eotvos Lorand Univ, Dept Phys Complex Syst, H-1117 Budapest, Hungary. Univ Tokyo, Sch Sci, Dept Astron, Tokyo 1130033, Japan. Univ Tokyo, Sch Sci, Res Ctr Early Universe, Tokyo 1130033, Japan. Univ Tokyo, Inst Cosm Ray Res, Tokyo 1888502, Japan. Inst Adv Study, Princeton, NJ 08540 USA. USN Observ, Washington, DC 20392 USA. USN, Res Lab, Remote Sensing Div, Washington, DC 20375 USA. Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA. Penn State Univ, Dept Astron & Astrophys, Davey Lab 525, University Pk, PA 16802 USA. Inst Astrophys, D-14482 Potsdam, Germany. Natl Astron Observ, Tokyo 1818588, Japan. RP Ivezic, Z (reprint author), Princeton Univ Observ, Peyton Hall, Princeton, NJ 08544 USA. RI Margon, Bruce/B-5913-2012; Stubbs, Christopher/C-2829-2012; Yasuda, Naoki/A-4355-2011; Csabai, Istvan/F-2455-2012; McKay, Timothy/C-1501-2009; Finlator, Kristian/M-4809-2014; OI Stubbs, Christopher/0000-0003-0347-1724; McKay, Timothy/0000-0001-9036-6150; Finlator, Kristian/0000-0002-0496-1656; Csabai, Istvan/0000-0001-9232-9898 NR 46 TC 199 Z9 201 U1 0 U2 4 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0004-6256 J9 ASTRON J JI Astron. J. PD AUG PY 2000 VL 120 IS 2 BP 963 EP 977 DI 10.1086/301455 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 349HZ UT WOS:000089040800037 ER PT J AU Keilty, KA Liang, EP Ditmire, T Remington, BA Shigemori, K Rubenchik, AM AF Keilty, KA Liang, EP Ditmire, T Remington, BA Shigemori, K Rubenchik, AM TI Modeling of laser-generated radiative blast waves SO ASTROPHYSICAL JOURNAL LA English DT Article DE gamma rays : bursts; methods : laboratory; radiation mechanisms : nonthermal shock waves; supernova remnants ID SUPERNOVA-REMNANTS; FLUID-DYNAMICS; HYDRODYNAMICS; INSTABILITY AB We simulate experiments performed with the Falcon laser at Lawrence Livermore National Laboratory to generate strong, cylindrically diverging blast waves of relevance to astrophysics. In particular, we are interested in producing and modeling radiative shocks. We compare numerical simulations with the data and with an analytic approximation to blast-wave propagation with a radiative-loss term included. Our goal is to develop a laboratory setting for studying radiative shocks of relevance to supernova remnants, gamma-ray burst afterglows, and other high-energy astrophysics phenomena. We will show that a good degree of agreement exists between the experimental data and the numerical simulations, demonstrating that it is indeed possible to generate radiative shocks in the laboratory using tabletop femtosecond lasers. In addition, we show how we can determine the energy-loss rate from the blast-wave evolution. This analytic met:hod is independent of the exact mechanism of radiative cooling and is scalable to both the laboratory and astrophysical radiative blast waves. C1 Rice Univ, Dept Space Phys & Astron, Houston, TX 77005 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ Calif Davis, Davis, CA 95616 USA. RP Keilty, KA (reprint author), Rice Univ, Dept Space Phys & Astron, Houston, TX 77005 USA. OI Shigemori, Keisuke/0000-0002-3978-8427 NR 22 TC 25 Z9 27 U1 0 U2 4 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 SOUTH WOODLAWN AVE, CHICAGO, IL 60637-1603 USA SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 1 PY 2000 VL 538 IS 2 BP 645 EP 652 DI 10.1086/309164 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 345PR UT WOS:000088824800018 ER PT J AU Gibbons, JW Scott, DE Ryan, TJ Buhlmann, KA Tuberville, TD Metts, BS Greene, JL Mills, T Leiden, Y Poppy, S Winne, CT AF Gibbons, JW Scott, DE Ryan, TJ Buhlmann, KA Tuberville, TD Metts, BS Greene, JL Mills, T Leiden, Y Poppy, S Winne, CT TI The global decline of reptiles, Deja Vu amphibians SO BIOSCIENCE LA English DT Review ID TERRESTRIAL BUFFER ZONES; LONG-LIVED ORGANISMS; CLIMATE-CHANGE; POPULATION DECLINES; NATURAL FLUCTUATIONS; AMERICAN ALLIGATORS; CHELYDRA-SERPENTINA; PACIFIC-NORTHWEST; EASTERN AUSTRALIA; SEX DETERMINATION C1 Univ Georgia, Savannah River Ecol Lab, Aiken, SC 29802 USA. Conservat Int, Ctr Appl Biodivers Sci, Washington, DC 20037 USA. RP Gibbons, JW (reprint author), Univ Georgia, Savannah River Ecol Lab, Aiken, SC 29802 USA. NR 148 TC 609 Z9 673 U1 32 U2 400 PU AMER INST BIOLOGICAL SCI PI WASHINGTON PA 1444 EYE ST, NW, STE 200, WASHINGTON, DC 20005 USA SN 0006-3568 J9 BIOSCIENCE JI Bioscience PD AUG PY 2000 VL 50 IS 8 BP 653 EP 666 DI 10.1641/0006-3568(2000)050[0653:TGDORD]2.0.CO;2 PG 14 WC Biology SC Life Sciences & Biomedicine - Other Topics GA 343QE UT WOS:000088712400007 ER PT J AU Fehler, M Sato, H Huang, LJ AF Fehler, M Sato, H Huang, LJ TI Envelope broadening of outgoing waves in 2D random media: A comparison between the Markov approximation and numerical simulations SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Article ID SEISMOGRAM ENVELOPES; PARABOLIC APPROXIMATION; STRONG SCINTILLATIONS; SEISMIC SCATTERING; FOURIER MIGRATION; PROPAGATION; ATTENUATION; JAPAN; HETEROGENEITY; ASTROPHYSICS AB Observations of seismic waves from earthquakes at depths between 100 and 200 km beneath Japan show that the initial portion of the S-wave arrival has greater duration than can be accounted for by earthquake source-time duration. The observed long duration of S waves has been explained as being caused by multiple forward scattering around the ray path between source and receiver, Array observations of Lg waveforms have also shown that multiple forward scattering along the path between the source and receiver are important influences on the character of Lg waveforms and that the scattering cannot be explained only by vertical variations in velocity. Multiple forward scattering in 3D has been modeled using the Markov approximation for the parabolic-wave equation, which allows the calculation of seismogram envelopes in statistically characterized random media. To test the range of validity of the Markov approximation-derived solutions, we made 2D numerical calculations of wavefields in random media using approximations to the parabolic wave equation, which only models forward scattering, and by finite-difference solution of the scaler-wave equation, which gives complete wavefields. Media of background velocity 4 km/sec are characterized using a Gaussian autocorrelation function with a 5 km con-elation distance and 5% rms fractional fluctuation. To compare with envelopes obtained from the Markov approximation, we calculated wavefields for source-receiver distances ranging from 50 to 200 km for several statistically identical realizations of random media, We obtain ensemble average envelopes by averaging envelopes from the realizations. We find a good agreement between ensemble-average envelopes obtained from the numerical solution of the parabolic-wave equation and envelopes obtained from the Markov approximation. The later portion of the ensemble-average envelopes calculated using finite difference have larger amplitudes than those from the Markov approximation, which is probably due to the late-arriving energy that has been scattered at wide angles from the global propagation direction between the source and the receiver. We observe that the variations among the numerically calculated envelopes of individual realizations of random media are well fit by a Rayleigh distribution, which describes the distribution of envelope amplitude when signals of one frequency bur random phase are summed. Our results show that the Markov approximation provides reliable information about envelope shapes for forward-scattered wavefields but that the influence of wide-angle scattering and backscattering have some influences on envelope shapes and should be considered when analyzing data using random media models. C1 Univ Calif Los Alamos Natl Lab, Los Alamos Seism Res Ctr, Los Alamos, NM 87545 USA. Tohoku Univ, Grad Sch Sci, Dept Geophys, Aoba Ku, Sendai, Miyagi 9808578, Japan. RP Fehler, M (reprint author), Univ Calif Los Alamos Natl Lab, Los Alamos Seism Res Ctr, MS D443, Los Alamos, NM 87545 USA. NR 33 TC 34 Z9 35 U1 0 U2 4 PU SEISMOLOGICAL SOC AMER PI EL CERRITO PA PLAZA PROFESSIONAL BLDG, SUITE 201, EL CERRITO, CA 94530 USA SN 0037-1106 J9 B SEISMOL SOC AM JI Bull. Seismol. Soc. Amer. PD AUG PY 2000 VL 90 IS 4 BP 914 EP 928 DI 10.1785/0119990143 PG 15 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 349TB UT WOS:000089060700009 ER PT J AU Vieira, NE Goans, RE Weiss, GH Hopkins, E Marini, JC Yergey, AL AF Vieira, NE Goans, RE Weiss, GH Hopkins, E Marini, JC Yergey, AL TI Calcium kinetics in children with osteogenesis imperfecta type III and IV: Pre- and post-growth hormone therapy SO CALCIFIED TISSUE INTERNATIONAL LA English DT Article DE stable isotopes; bone-metabolism; children ID PLASMA CALCIUM; BONE; AXIS AB Children with osteogenesis imperfecta (OI) type III and type IV were studied using a Ca-42 stable isotope technique. Serum dilution kinetics of 42Ca were studied pre-and post-growth hormone (GH) treatment in 9 OI III (age range 5-9 years) and 8 OI IV patients (age range 5-12 years). Each subject was studied twice: at baseline and following GH therapy (range 1-1.5 years). Isotopic enrichments of 42Ca were followed over 7 days using thermal ionization mass spectrometry. A binding site model, which describes reversible and irreversible binding of calcium (Ca) ions to postulated short- and long-term binding sites in bone, was used to analyze the kinetic data. In type III patients, GH treatment (1) increased the fraction of short-term binding sites, theta (0.777 +/- 0.112 versus 0.877 +/- 0.05, respectively; P = 0.034); (2) increased the apparent half-life of a Ca ion attached to the long-term binding site by 76% (P = 0.009); (3) although not statistically significant (P = 0.098), a trend toward an increased growth rate was observed with increasing change in theta (Delta theta); (4) patients experienced a 75% increase in growth rate during the first 6 months of treatment. In type IV patients, GH treatment increased the apparent half-life of a Ca ion attached to the long-term binding site by 83% (P = 0.048), however, no trend toward an Increased growth rate was observed with increasing Delta theta in these patients. These significant changes in Ca binding to bone may influence growth in type III patients. C1 NICHHD, NIH, Lab Cellular & Mol Biophys, Bethesda, MD 20892 USA. Oak Ridge Associated Univ, REACTS, Oak Ridge, TN 37716 USA. NIH, Ctr Informat Technol, Bethesda, MD 20892 USA. NICHHD, NIH, Heritable Disorders Branch, Bethesda, MD 20892 USA. RP Vieira, NE (reprint author), NICHHD, NIH, Lab Cellular & Mol Biophys, Bldg 10,Room 9D52,10 Ctr Dr,M5C 1580, Bethesda, MD 20892 USA. NR 15 TC 9 Z9 9 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 0171-967X J9 CALCIFIED TISSUE INT JI Calcif. Tissue Int. PD AUG PY 2000 VL 67 IS 2 BP 97 EP 100 DI 10.1007/s00223001110 PG 4 WC Endocrinology & Metabolism SC Endocrinology & Metabolism GA 337XA UT WOS:000088387400001 PM 10920211 ER PT J AU Geist, DR Jones, J Murray, CJ Dauble, DD AF Geist, DR Jones, J Murray, CJ Dauble, DD TI Suitability criteria analyzed at the spatial scale of redd clusters improved estimates of fall chinook salmon (Oncorhynchus tshawytscha) spawning habitat use in the Hanford Reach, Columbia River SO CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES LA English DT Article ID TROUT; FEATURES AB We improved our predictions of fall chinook salmon (Oncorhynchus tshawytscha) habitat use by analyzing spawning habitat at the spatial scale of redd clusters. Spatial point pattern analyses indicated that redd clusters in the Hanford Reach, Columbia River, were consistent in their location from 1994 to 1995. Redd densities were 16.1 and 8.9 redds.ha(-1) in 1994 and 1995, respectively, and individual redds within clusters were usually less than 30 m apart. Pattern analysis also showed strong evidence that redds were uniformly distributed within the clusters where interredd distances ranged from 2 to 5 m. Redd clusters were found to occur predominantly where water velocity was between 1.4 and 2 m.s(-1), water depth was 2-4 m, and lateral slope of the riverbed was less than 4%. This habitat use represented a narrower range of use than previously reported for adult fall chinook salmon. Logistic regression analysis determined that water velocity and lateral slope were the most significant predictors of redd cluster location over a range of river discharges. Overestimates of available spawning habitat lead to nonachievable goals for protecting and restoring critical salmonid habitat. Better predictions of spawning habitat may be possible if cluster-specific characteristics are used. C1 Pacific NW Lab, Ecol Grp, Richland, WA 99352 USA. Oregon State Univ, Dept Geosci, Corvallis, OR 97331 USA. Pacific NW Lab, Appl Geol & Geochem Grp, Richland, WA 99352 USA. RP Geist, DR (reprint author), Pacific NW Lab, Ecol Grp, POB 999,MS K6-85, Richland, WA 99352 USA. NR 35 TC 28 Z9 28 U1 1 U2 4 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA, ONTARIO K1A 0R6, CANADA SN 0706-652X J9 CAN J FISH AQUAT SCI JI Can. J. Fish. Aquat. Sci. PD AUG PY 2000 VL 57 IS 8 BP 1636 EP 1646 DI 10.1139/cjfas-57-8-1636 PG 11 WC Fisheries; Marine & Freshwater Biology SC Fisheries; Marine & Freshwater Biology GA 335YA UT WOS:000088273200011 ER PT J AU Geist, DR AF Geist, DR TI Hyporheic discharge of river water into fall chinook salmon (Oncorhynchus tshawytscha) spawning areas in the Hanford Reach, Columbia River SO CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES LA English DT Article ID TROUT SALVELINUS-FONTINALIS; REDD-SITE SELECTION; BROOK TROUT; GROUNDWATER; EXCHANGE; HABITAT AB Fall chinook salmon (Oncorhynchus tshawytscha) spawned predominantly in areas of the Hanford Reach of the Columbia River where hyporheic water discharged into the river channel. This upwelling water had a dissolved solids content (i.e., specific conductance) indicative of river water and was presumed to have entered highly permeable riverbed substrate at locations upstream of the spawning areas. Hyporheic discharge zones composed of undiluted ground water or areas with little or no upwelling were not used by spawning salmon. Rates of upwelling into spawning areas averaged 1200 L.m(-2).day(-1) (95% CI = 784-1665 L.m(-2).day(-1)) as compared with approximately 500 L.m(-2).day(-1) (95% CI = 303-1159 L.m(-2).day(-1)) in nonspawning areas. Dissolved oxygen content of the hyporheic discharge near salmon spawning areas was about 9 mg.L-1 (+/- 0.4 mg.L-1) whereas in nonspawning areas, dissolved oxygen values were 7 mg.L-1 (+/- 0.9 mg.L-1) or lower. In both cases, dissolved oxygen of the river water was higher (11.3 +/- 0.3 mg.L-1). Physical and chemical gradients between the hyporheic zone and the river may provide cues for adult salmon to locate suitable spawning areas. This information will help fisheries managers to describe the suitability of salmon spawning habitat in large rivers. C1 Pacific NW Lab, Ecol Grp, Richland, WA 99352 USA. RP Geist, DR (reprint author), Pacific NW Lab, Ecol Grp, POB 999,MS K6-85, Richland, WA 99352 USA. NR 36 TC 51 Z9 53 U1 2 U2 10 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA, ONTARIO K1A 0R6, CANADA SN 0706-652X J9 CAN J FISH AQUAT SCI JI Can. J. Fish. Aquat. Sci. PD AUG PY 2000 VL 57 IS 8 BP 1647 EP 1656 DI 10.1139/cjfas-57-8-1647 PG 10 WC Fisheries; Marine & Freshwater Biology SC Fisheries; Marine & Freshwater Biology GA 335YA UT WOS:000088273200012 ER PT J AU Kolonel, LN Hankin, JH Whittemore, AS Wu, AH Gallagher, RP Wilkens, LR John, EM Howe, GR Dreon, DM West, DW Paffenbarger, RS AF Kolonel, LN Hankin, JH Whittemore, AS Wu, AH Gallagher, RP Wilkens, LR John, EM Howe, GR Dreon, DM West, DW Paffenbarger, RS TI Vegetables, fruits, legumes and prostate cancer: A multiethnic case-control study SO CANCER EPIDEMIOLOGY BIOMARKERS & PREVENTION LA English DT Article ID DIETARY BETA-CAROTENE; UNITED-STATES; RISK; MEN; LYCOPENE; HAWAII; FOODS; CONSUMPTION; PREVENTION; POPULATION AB The evidence for a protective effect of vegetables, fruits, and legumes against prostate cancer is weak and inconsistent. We examined the relationship of these food groups and their constituent foods to prostate cancer risk in a multicenter case-control study of African-American, white, Japanese, and Chinese men. Cases (n = 1619) with histologically confirmed prostate cancer were identified through the population-based tumor registries of Hawaii, San Francisco, and Los Angeles in the United States and British Columbia and Ontario in Canada. Controls (n 1618) were frequency-matched to cases on ethnicity, age, and region of residence of the case, in a ratio of approximately 1:1, Dietary and other information was collected by in-person home interview; a blood sample was obtained from control subjects for prostate-specific antigen determination, Odds ratios (OR) were estimated using logistic regression, adjusting for age, geographic location, education, calories, and when indicated, ethnicity. Intake of legumes (whether total legumes, soyfoods specifically, or other legumes) was inversely related to prostate cancer (OR for highest relative to lowest quintile for total legumes = 0.62; P for trend = 0.0002); results were similar when restricted to prostate-specific antigen-normal controls or to advanced cases. Intakes of yellow-orange and cruciferous vegetables were also inversely related to prostate cancer, especially for advanced cases, among whom the highest quintile OR for yellow-orange vegetables = 0.67 (P for trend = 0.01) and the highest quintile OR for cruciferous vegetables = 0.61 (P for trend = 0.006), Intake of tomatoes and of fruits was not related to risk. Findings were generally consistent across ethnic groups. These results suggest that legumes (not limited to soy products) and certain categories of vegetables may protect against prostate cancer. C1 Univ Hawaii, Canc Res Ctr, Honolulu, HI 96813 USA. Stanford Univ, Stanford, CA 94305 USA. Univ So Calif, Los Angeles, CA USA. British Columbia Canc Agcy, Vancouver, BC 15Z 4E6, Canada. No Calif Canc Ctr, Union City, CA USA. Columbia Univ, New York, NY 10027 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Kolonel, LN (reprint author), Univ Hawaii, Canc Res Ctr, 1236 Lauhala St, Honolulu, HI 96813 USA. FU NCI NIH HHS [R35CA47448, CA49446] NR 50 TC 301 Z9 307 U1 1 U2 7 PU AMER ASSOC CANCER RESEARCH PI BIRMINGHAM PA PO BOX 11806, BIRMINGHAM, AL 35202 USA SN 1055-9965 J9 CANCER EPIDEM BIOMAR JI Cancer Epidemiol. Biomarkers Prev. PD AUG PY 2000 VL 9 IS 8 BP 795 EP 804 PG 10 WC Oncology; Public, Environmental & Occupational Health SC Oncology; Public, Environmental & Occupational Health GA 343UC UT WOS:000088719500005 PM 10952096 ER PT J AU Padial, NT VanderHeyden, WB Rauenzahn, RM Yarbro, SL AF Padial, NT VanderHeyden, WB Rauenzahn, RM Yarbro, SL TI Three-dimensional simulation of a three-phase draft-tube bubble column SO CHEMICAL ENGINEERING SCIENCE LA English DT Article DE bubble column; three phase; multiphase; turbulence; numerical; computer simulation ID LOOP REACTOR; HYDRODYNAMICS; TURBULENCE; FLOWS AB Three-dimensional simulations of a three-phase flow in conical-bottom draft-tube bubble columns were performed using a finite-volume flow simulation technique. Simulated gas volume fraction and column circulation times agree with the experimental observations of Pironti el al. (Chemical Engineering Journal, 60, 155-160). Furthermore, the simulations showed the same loss of column circulation as observed experimentally when the column was operated with the draft-tube in its highest position. The simulation code employed an unstructured grid method along with a multifield description of the multiphase flow dynamics. Modeled physical phenomena included momentum exchange and turbulence due to both sheer and slip among phases. (C) 2000 Elsevier Science Ltd. All rights reserved. C1 Univ Calif Los Alamos Natl Lab, Theoret Div T3 Fluid Dynam, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Nucl Mat Technol Div, Los Alamos, NM 87545 USA. RP Padial, NT (reprint author), Univ Calif Los Alamos Natl Lab, Theoret Div T3 Fluid Dynam, POB 1663,Mail Stop B216, Los Alamos, NM 87545 USA. NR 25 TC 50 Z9 52 U1 1 U2 10 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0009-2509 J9 CHEM ENG SCI JI Chem. Eng. Sci. PD AUG PY 2000 VL 55 IS 16 BP 3261 EP 3273 DI 10.1016/S0009-2509(99)00587-4 PG 13 WC Engineering, Chemical SC Engineering GA 317VV UT WOS:000087248400017 ER PT J AU Wright, AL Harrell, G Hahn, G AF Wright, AL Harrell, G Hahn, G TI Performing a steam system checkup - A three-step checkup identifies potential opportunities for improvements SO CHEMICAL PROCESSING LA English DT Article AB Just like their operators, steam systems need regular checkups to stay healthy, A yearly steam system checkup can improve a plant's productivity and profitability, This article shows readers how to profile their steam systems and identify problems and opportunities for improvement. C1 Oak Ridge Natl Lab, Engn Technol Div, Oak Ridge, TN 37831 USA. Virginia Polytech Inst & State Univ, Energy Management Inst, Jefferson City, TN USA. Spirax Sarco Inc, Allentown, PA USA. RP Wright, AL (reprint author), Oak Ridge Natl Lab, Engn Technol Div, Oak Ridge, TN 37831 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PUTMAN PUBL CO PI CHICAGO PA 301 E ERIE STREET, CHICAGO, IL 60611 USA SN 0009-2630 J9 CHEM PROCESS JI Chem. Process. PD AUG PY 2000 VL 63 IS 8 BP 32 EP + PG 4 WC Engineering, Chemical SC Engineering GA 396HB UT WOS:000166629300006 ER PT J AU Bhatia, RB Brinker, CJ Gupta, AK Singh, AK AF Bhatia, RB Brinker, CJ Gupta, AK Singh, AK TI Aqueous sol-gel process for protein encapsulation SO CHEMISTRY OF MATERIALS LA English DT Article ID ORGANOPHOSPHATE HYDROLASE; ADSORPTION; GLASS; RETENTION; KINETICS; SUPPORTS; SENSORS; MODEL AB Porous silica materials made by low-temperature sol-gel process are promising host matrixes for encapsulation of biomolecules. To date, researchers have focused on sol-gel routes using alkoxides such as tetramethyl orthosilicate (TMOS) and tetraethyl orthosilicate (TEOS) for encapsulation of biomolecules. These routes lead to formation of alcohol as a byproduct that can have a detrimental effect on the activity of entrapped biomolecules. We have developed a novel aqueous sol-gel process to encapsulate biological molecules (such as enzymes, antibodies, and cells) that uses neutral pH and room temperature and does not generate alcohol as a byproduct. The process uses sodium silicate as precursor and is carried out in two steps: preparation of a low-pH silicate sol followed by gelation at neutral pH with a suitable buffer containing biomolecules. Two enzymes widely used in biosensing applications, horseradish peroxidase (HRP) and glucose-6-phosphate dehydrogenase (G6PDH), were used to prepare enzyme-doped silica monoliths and to investigate the effect of silica as host matrix on enzyme kinetics. The yield of the encapsulation process was close to 100% for both enzymes, and no significant leaching of enzyme molecules was observed over time. Encapsulated enzymes followed Michaelis-Menten kinetics and maintained good catalytic activity, the specific activity of encapsulated HRP and G6PDH being 73% and 36% of the specific activities of the free enzymes, respectively. The values of the Michaelis constant (K-m) of the encapsulated enzymes were higher than those of the free enzymes, indicating the presence of partitioning and diffusional effects in the pores of the sol-gel matrix. The encapsulated enzymes also exhibited a different pH dependence of catalytic activity; the pH maxima for enzymatic activity for encapsulated enzymes were higher by 0.5-1 pH unit than those for enzymes in solution. These novel enzyme-doped silica matrixes provide promising platforms for development of biosensors, affinity supports, and immobilized enzyme reactors. C1 Univ New Mexico, Ctr Microengineered Mat, Albuquerque, NM 87106 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. Sandia Natl Labs, Biosyst Res Dept, Livermore, CA 94551 USA. RP Brinker, CJ (reprint author), Univ New Mexico, Ctr Microengineered Mat, Albuquerque, NM 87106 USA. NR 35 TC 239 Z9 242 U1 4 U2 78 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD AUG PY 2000 VL 12 IS 8 BP 2434 EP 2441 DI 10.1021/cm000260f PG 8 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA 349DN UT WOS:000089028600053 ER PT J AU Xie, SB Iglesia, E Bell, AT AF Xie, SB Iglesia, E Bell, AT TI Water-assisted tetragonal-to-monoclinic phase transformation of ZrO2 at low temperatures SO CHEMISTRY OF MATERIALS LA English DT Article ID SURFACE-AREA ZIRCONIA; METHANOL SYNTHESIS; HYDROUS ZIRCONIA; NICKEL-ZIRCONIA; OXIDE; CATALYSTS; ISOMERIZATION; MICROCRYSTALS; STABILIZATION; HYDROGENATION AB In-situ Raman spectroscopy has been used to characterize the transformation of amorphous zirconium oxyhydroxide to tetragonal ZrO2 and then to monoclinic ZrO2 in both the absence and presence of water vapor. In the absence of H2O vapor, t-ZrO2 forms when zirconium oxyhydroxide is treated in air above 673 K and the tetragonal-to-monoclinic transformation occurs at temperatures above 950 K. Treatment at progressively higher temperatures is accompanied by loss of surface area. The tetragonal-to-monoclinic transformation occurs when the size of the zirconia particles is equal to or greater than a critical size determined from an analysis of the thermodynamic stability of small particles of t- and m-ZrO2. Exposure of t-ZrO2 to 3 kPa of H2O or immersion in liquid water at 298 K results in its extensive (similar to 80%) transformation to m-ZrO2 without a loss in surface area. This observation is attributed to a decrease in the difference between the surface free energy of m-ZrO2 and that of t-ZrO2 caused by the adsorption of H2O. Treatment in water vapor at 623 K induces the tetragonal-to-monoclinic transformation as well, but it is accompanied by a significant decrease in surface area. Only 80% of the t-ZrO2 is transformed to m-ZrO2 at 298 K because of the apparent presence of some crystallites with lattice strain, which increases the temperature for the tetragonal-to-monoclinic phase transformation. The results of this study demonstrate that m-ZrO2 with high surface areas can be prepared by exposing t-ZrO2 to water vapor at room temperature. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA. RP Iglesia, E (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem, Berkeley, CA 94720 USA. RI Iglesia, Enrique/D-9551-2017; OI Iglesia, Enrique/0000-0003-4109-1001; Bell, Alexis/0000-0002-5738-4645 NR 43 TC 63 Z9 65 U1 0 U2 35 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD AUG PY 2000 VL 12 IS 8 BP 2442 EP 2447 DI 10.1021/cm000212v PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA 349DN UT WOS:000089028600054 ER PT J AU Jones, BR Olejniczak, I Dong, J Pigos, JM Zhu, ZT Garlach, AD Musfeldt, JL Koo, HJ Whangbo, MH Schlueter, JA Ward, BH Morales, E Kini, AM Winter, RW Mohtasham, J Gard, GL AF Jones, BR Olejniczak, I Dong, J Pigos, JM Zhu, ZT Garlach, AD Musfeldt, JL Koo, HJ Whangbo, MH Schlueter, JA Ward, BH Morales, E Kini, AM Winter, RW Mohtasham, J Gard, GL TI Optical spectra and electronic band structure calculations of beta ''-(ET)(2)SF5RSO3 (R = CH2CF2, CHFCF2, and CHF): Changing electronic properties by chemical tuning of the counterion SO CHEMISTRY OF MATERIALS LA English DT Article ID BEDT-TTF; SUPERCONDUCTOR; BIS(ETHYLENEDITHIO)TETRATHIAFULVALENE; SALTS AB We report the polarized infrared reflectance spectra, optical conductivity, and electronic band structure of metallic beta "-(ET)(2)SF5CHFSO3 and compare our results with those of the beta "-(ET)(2)SF5CH2CF2SO3 superconductor and the beta "-(ET)(2)SF5CHFCF2SO3 metal/insulator material. We discuss the electronic structure of these organic molecular solids in terms of band structure, many-body effects, and disorder. On the basis of spectral similarities between the superconductor and metallic salts and structural differences in the anion pocket of all three, we conclude that the unusual electronic excitations observed in the beta "-(ET)(2)SF5-CHFCF2SO3 metal/insulator material are not caused by electron correlation but are due to disorder-related localization. C1 SUNY Binghamton, Dept Chem, Binghamton, NY 13902 USA. N Carolina State Univ, Dept Chem, Raleigh, NC 27695 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Portland State Univ, Dept Chem, Portland, OR 97207 USA. Polish Acad Sci, Inst Mol Phys, Poznan, Poland. RP Olejniczak, I (reprint author), SUNY Binghamton, Dept Chem, Binghamton, NY 13902 USA. RI Zhu, Zhengtao/A-1633-2009; Kini, Aravinda/F-4467-2012 OI Zhu, Zhengtao/0000-0002-9311-2110; NR 25 TC 18 Z9 18 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD AUG PY 2000 VL 12 IS 8 BP 2490 EP 2495 DI 10.1021/cm000349l PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA 349DN UT WOS:000089028600060 ER PT J AU Campbell, EM Hogan, WJ Crandall, DH AF Campbell, EM Hogan, WJ Crandall, DH TI Inertial fusion science and technology for the 21(st) century SO COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE IV PHYSIQUE ASTROPHYSIQUE LA English DT Article DE inertial fusion; energy; laser; high energy density; petawatt; laboratory astrophysics; NIF ID SUPERNOVA HYDRODYNAMICS; HOT-ELECTRONS; NOVA LASER; INSTABILITY; DEUTERIUM; TARGETS AB This paper reviews the leading edge of the basic and applied science that use high-intensity facilities. The more than 15 000 experiments on the Nova laser since 1985 and many thousands more on other laser, particle beam, and pulsed power facilities around the world have established the new laboratory field of high-energy-density plasma physics and have furthered development of inertial fusion. High-brightness femtosecond lasers have enabled the study of matter in conditions previously unachievable on earth. These experiments and advanced calculations have established the specifications for the National Ignition Facility (NIF) and Laser MegaJoule (LMJ) and have enhanced scientific fields such as laboratory astrophysics. Science and technology developed in inertial fusion have found near-term commercial use, have enabled steady progress toward the goal of fusion ignition and gain in the laboratory, and have opened up new fields of study for the 21(st) century. (C) 2000 Academie des sciences/Editions scientifiques et medicales Elsevier SAS. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. US DOE, Washington, DC 20585 USA. RP Campbell, EM (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94550 USA. NR 26 TC 2 Z9 2 U1 0 U2 1 PU EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER PI PARIS CEDEX 15 PA 23 RUE LINOIS, 75724 PARIS CEDEX 15, FRANCE SN 1296-2147 J9 CR ACAD SCI IV-PHYS JI C. R. Acad. Sci. Ser. IV-Phys. Astrophys. PD AUG PY 2000 VL 1 IS 6 BP 671 EP 679 DI 10.1016/S1296-2147(00)01075-1 PG 9 WC Astronomy & Astrophysics; Physics, Multidisciplinary SC Astronomy & Astrophysics; Physics GA 374CV UT WOS:000165327600002 ER PT J AU Labaune, C Fuchs, J Depierreux, S Baldis, HA Pesme, D Myatt, J Huller, S Tikhonchuk, VT Laval, G AF Labaune, C Fuchs, J Depierreux, S Baldis, HA Pesme, D Myatt, J Huller, S Tikhonchuk, VT Laval, G TI Laser-plasma interaction physics in the context of fusion SO COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE IV PHYSIQUE ASTROPHYSIQUE LA English DT Article DE laser-plasma interaction; parametric instabilities; stimulated Brillouin and Raman scattering Thomson scattering; beam smoothing; coherence; self-focusing ID STIMULATED RAMAN-SCATTERING; INERTIAL CONFINEMENT FUSION; SCALE-LENGTH PLASMAS; RANDOM-PHASE PLATE; HOT-SPOTS; LANGMUIR DECAY; BRILLOUIN; WAVES; FILAMENTATION; REFLECTIVITY AB Of vital importance for Inertial Confinement Fusion (ICF) are the understanding and control of the nonlinear processes which can occur during the propagation of the laser pulses through the underdense plasma surrounding the fusion capsule. The control of parametric instabilities has been studied experimentally, using the LULI six-beam laser facility, and also theoretically and numerically. New results based on the direct observation of plasma waves with Thomson scattering of a short wavelength probe beam have revealed the occurence of the Langmuir decay instability. This secondary instability may play an important role in the saturation of stimulated Raman scattering. Another mechanism for reducing the growth of the scattering instabilities is the so-called 'plasma-induced incoherence'. Namely, recent theoretical studies have shown that the propagation of laser beams through the underdense plasma can increase their spatial and temporal incoherence. This plasma-induced beam smoothing can reduce the levels of parametric instabilities. One signature of this process is a large increase of the spectral width of the laser light after propagation through the plasma. Comparison of the experimental results with numerical simulations shows an excellent agreement between the observed and calculated time-resolved spectra of the transmitted laser light at various laser intensities. (C) 2000 Academie des sciences/Editions scientifiques et medicales Elsevier SAS. C1 Ecole Polytech, CNRS, Lab Utilisat Lasers Intenses, F-91128 Palaiseau, France. Univ Calif Lawrence Livermore Natl Lab, Inst Laser Sci & Applicat, Livermore, CA 94550 USA. Ecole Polytech, Ctr Phys Theor, F-91128 Palaiseau, France. PN Lebedev Phys Inst, Moscow 117924, Russia. RP Labaune, C (reprint author), Ecole Polytech, CNRS, Lab Utilisat Lasers Intenses, F-91128 Palaiseau, France. NR 39 TC 11 Z9 11 U1 1 U2 4 PU EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER PI PARIS CEDEX 15 PA 23 RUE LINOIS, 75724 PARIS CEDEX 15, FRANCE SN 1296-2147 J9 CR ACAD SCI IV-PHYS JI C. R. Acad. Sci. Ser. IV-Phys. Astrophys. PD AUG PY 2000 VL 1 IS 6 BP 727 EP 735 DI 10.1016/S1296-2147(00)01078-7 PG 9 WC Astronomy & Astrophysics; Physics, Multidisciplinary SC Astronomy & Astrophysics; Physics GA 374CV UT WOS:000165327600007 ER PT J AU Tanaka, KA Kodama, R Izumi, N Takahashi, K Heya, M Fujita, H Kato, Y Kitagawa, Y Mima, K Miyanaga, N Norimatsu, T Sentoku, Y Sunahara, A Takabe, H Yamanaka, T Koase, T Iwatani, T Ohtani, F Miyakoshi, T Habara, H Tanpo, M Tohyama, S Weber, FA Barbee, TW Dasilva, LB AF Tanaka, KA Kodama, R Izumi, N Takahashi, K Heya, M Fujita, H Kato, Y Kitagawa, Y Mima, K Miyanaga, N Norimatsu, T Sentoku, Y Sunahara, A Takabe, H Yamanaka, T Koase, T Iwatani, T Ohtani, F Miyakoshi, T Habara, H Tanpo, M Tohyama, S Weber, FA Barbee, TW Dasilva, LB TI Self-focusing and its related interactions at very high laser intensities for fast ignition at Osaka University SO COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE IV PHYSIQUE ASTROPHYSIQUE LA English DT Article DE laser self-focusing; ponderomotive force; relativistic effect; implosion and fast ignition ID IRRADIATION UNIFORMITY; OVERDENSE PLASMAS AB At the Institute of Laser Engineering, various type of experiments related to fast ignition were performed with the 12-beam laser system GEKKO XII and the newly added 100 TW beams line. Using both X-ray and UV laser probes, drilling via ponderomotive laser light self-focusing was studied to show drilling well into the overdense plasma over a distance of 100 mum at a self-focused laser intensity of 10(18) W/cm(2). This type of self-focusing accelerated electrons up to 0.1 to 1 MeV and was also applied to an imploding shell. (C) 2000 Academie des sciences/Editions scientifiques et medicales Elsevier SAS. C1 Osaka Univ, Inst Laser Engn, Suita, Osaka 565, Japan. Osaka Univ, Fac Engn, Suita, Osaka 565, Japan. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA USA. RP Tanaka, KA (reprint author), Osaka Univ, Inst Laser Engn, Suita, Osaka 565, Japan. RI Miyanaga, Noriaki/F-1340-2015; Norimatsu, Takayoshi/I-5710-2015; Mima, Kunioki/H-9014-2016; Kodama, Ryosuke/G-2627-2016; IZUMI, Nobuhiko/J-8487-2016; Sentoku, Yasuhiko/P-5419-2014; OI Miyanaga, Noriaki/0000-0002-9902-5392; IZUMI, Nobuhiko/0000-0003-1114-597X; SUNAHARA, ATSUSHI/0000-0001-7543-5226 NR 12 TC 0 Z9 0 U1 0 U2 2 PU EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER PI PARIS CEDEX 15 PA 23 RUE LINOIS, 75724 PARIS CEDEX 15, FRANCE SN 1296-2147 J9 CR ACAD SCI IV-PHYS JI C. R. Acad. Sci. Ser. IV-Phys. Astrophys. PD AUG PY 2000 VL 1 IS 6 BP 737 EP 744 DI 10.1016/S1296-2147(00)01079-9 PG 8 WC Astronomy & Astrophysics; Physics, Multidisciplinary SC Astronomy & Astrophysics; Physics GA 374CV UT WOS:000165327600008 ER PT J AU Bibeau, C Bayramian, A Beach, RJ Chanteloup, JC Ebbers, CA Emanuel, MA Orth, CD Payne, SA Rothenberg, JE Powell, HT Schaffers, KI Skidmore, JA Sutton, SB Zapata, LE AF Bibeau, C Bayramian, A Beach, RJ Chanteloup, JC Ebbers, CA Emanuel, MA Orth, CD Payne, SA Rothenberg, JE Powell, HT Schaffers, KI Skidmore, JA Sutton, SB Zapata, LE TI Mercury and beyond: diode-pumped solid-state lasers for inertial fusion energy SO COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE IV PHYSIQUE ASTROPHYSIQUE LA English DT Article DE solid-state lasers; Yb : S-FAP crystal; diode pumping; inertial fusion energy; gas cooling AB We have begun building the Mercury laser system as the first in a series of new generation diode-pumped solid-state lasers for inertial fusion research. Mercury will integrate three key technologies: diodes, crystals and gas cooling, within a unique laser architecture that is scalable to kilojoules and megajoule energy levels for fusion energy applications. The primary near-term performance goals include 10% electrical efficiencies at 10 Hz and 100 J with a 2-10 ns pulse length at 1.047 mum wavelength. When completed, Mercury will allow rep-rated target experiments with multiple chambers for high energy density physics research. (C) 2000 Academie des sciences/Editions scientifiques et medicales Elsevier SAS. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Bibeau, C (reprint author), Univ Calif Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94550 USA. RI chanteloup, jean-christophe/H-6514-2013 OI chanteloup, jean-christophe/0000-0002-5643-0056 NR 7 TC 7 Z9 7 U1 1 U2 6 PU EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER PI PARIS CEDEX 15 PA 23 RUE LINOIS, 75724 PARIS CEDEX 15, FRANCE SN 1296-2147 J9 CR ACAD SCI IV-PHYS JI C. R. Acad. Sci. Ser. IV-Phys. Astrophys. PD AUG PY 2000 VL 1 IS 6 BP 745 EP 749 DI 10.1016/S1296-2147(00)01080-5 PG 5 WC Astronomy & Astrophysics; Physics, Multidisciplinary SC Astronomy & Astrophysics; Physics GA 374CV UT WOS:000165327600009 ER PT J AU Lash, JS Chandler, GA Cooper, G Derzon, M Douglas, MR Hebron, D Leeper, R Matzen, MK Mehlhorn, TA Nash, T Olson, R Ruiz, C Sanford, T Slutz, SA Peterson, DL Chrien, R AF Lash, JS Chandler, GA Cooper, G Derzon, M Douglas, MR Hebron, D Leeper, R Matzen, MK Mehlhorn, TA Nash, T Olson, R Ruiz, C Sanford, T Slutz, SA Peterson, DL Chrien, R TI The prospects for high yield ICF with a Z-pinch driven dynamic hohlraum SO COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE IV PHYSIQUE ASTROPHYSIQUE LA English DT Article DE Z-pinches; ICF; dynamic hohlraum ID INERTIAL CONFINEMENT FUSION; NATIONAL-IGNITION-FACILITY; DESIGN AB Recent success with the Sandia Z machine has renewed interest in utilizing fast Z-pinches for ICF. One promising concept places the ICF capsule internal to the imploding Z-pinch. At machine parameters relevant to achieving high yield, the imploding Z-pinch mass has sufficient opacity to trap radiation giving rise to a 'dynamic hohlraum'. Our concept utilizes a 12 MJ, 54 MA Z-pinch driver producing a capsule drive temperature exceeding 300 eV to realize a 550 MJ thermonuclear yield. We present the current high-yield design and its development that supports high-yield ICF with a Z-pinch driven dynamic hohlraum. (C) 2000 Academie des sciences/Editions scientifiques et medicales Elsevier SAS. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87854 USA. RP Lash, JS (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 11 TC 3 Z9 3 U1 1 U2 1 PU EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER PI PARIS CEDEX 15 PA 23 RUE LINOIS, 75724 PARIS CEDEX 15, FRANCE SN 1296-2147 J9 CR ACAD SCI IV-PHYS JI C. R. Acad. Sci. Ser. IV-Phys. Astrophys. PD AUG PY 2000 VL 1 IS 6 BP 759 EP 765 DI 10.1016/S1296-2147(00)01082-9 PG 7 WC Astronomy & Astrophysics; Physics, Multidisciplinary SC Astronomy & Astrophysics; Physics GA 374CV UT WOS:000165327600011 ER PT J AU Jaffe, JE Kurtz, RJ Gutowski, M AF Jaffe, JE Kurtz, RJ Gutowski, M TI Comparison of embedded-atom models and first-principles calculations for Al phase equilibrium SO COMPUTATIONAL MATERIALS SCIENCE LA English DT Article DE local density approximation; generalized gradient approximation; embedded-atom model; aluminum; high pressure; phase transition ID GENERALIZED GRADIENT APPROXIMATION; INTERATOMIC POTENTIALS; SYSTEMS AB We have performed total energy calculations on Al in the face-centered cubic (fcc), body-centered cubic (bcc), ideal hexagonal close packed (hcp), and simple cubic (sc) crystal structures over a range of unit cell volumes. We employed density functional theory (DFT) in the local density approximation (LDA) and the generalized gradient approximation (GGA) as well as two different forms of the embedded-atom method (EAM) empirical atomistic potential with the aim of evaluating the predictive range of the EAM relative to first-principles methods. All four calculations correctly give the fee structure as the preferred one at zero pressure, with the DFT results in good agreement with the experimental equation of state and the model potentials in exact agreement (by construction). The hcp structure is found to be fairly close in energy to the fee structure in all cases, and the sc structure is always found to be energetically very unfavorable. However, for the energetics of the bcc phase there is a serious disagreement between first-principles and atomistic calculations: The bulk modulus of bcc Al is much lower as predicted by the model potentials, with the result that its energy approaches that of the fee phase as the volume is reduced. For the potential of Mishin et al, an fee --> bcc phase transition is predicted at a pressure of 27.4 GPa, in disagreement with the experimental fact that fee Al is stable to at least 220 GPa. Our DFT results are consistent with earlier DFT calculations and with experiment in predicting no transition over the density or pressure range considered. (C) 2000 Elsevier Science B.V. All rights reserved. C1 Pacific NW Natl Lab, Dept Mat Sci, Richland, WA 99352 USA. Univ Gdansk, Dept Chem, PL-80952 Gdansk, Poland. RP Gutowski, M (reprint author), Pacific NW Natl Lab, Dept Mat Sci, 902 Battelle Blvd, Richland, WA 99352 USA. NR 11 TC 8 Z9 8 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0256 J9 COMP MATER SCI JI Comput. Mater. Sci. PD AUG PY 2000 VL 18 IS 2 BP 199 EP 204 DI 10.1016/S0927-0256(00)00096-3 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA 332MV UT WOS:000088078800009 ER PT J AU Castillo, JE Otto, JS AF Castillo, JE Otto, JS TI Numerical techniques for the transformation to an orthogonal coordinate system aligned with a vector field SO COMPUTERS & MATHEMATICS WITH APPLICATIONS LA English DT Article DE convection-diffusion equation; variational grid-generation; alignment; vector field ID GRID-GENERATION; DIRECTIONAL CONTROL AB We explore the use of variational grid-generation to perform alignment of a grid with a given vector field. Variational methods have proven to be a powerful class of grid-generators, but when they are used in alignment, difficulties may arise in treating boundaries due to an incompatibility between geometry and vector field. In this paper, a refinement of the procedure of iterating boundary values is presented. It allows one to control the quality of the grid in the face of the above-mentioned incompatibility. This procedure may be incorporated into any variational alignment algorithm. We demonstrate its use with respect to a new quasi-variational alignment method having a particularly simple structure. The latter method is comparable to Knupp's method (see [1]), but avoids use of the Winslow equations. (C) 2000 Elsevier Science Ltd. All rights reserved. C1 San Diego State Univ, Dept Math, San Diego, CA 92812 USA. Sandia Natl Labs, Scalable Comp Syst, Org 9223, Albuquerque, NM 87185 USA. RP Castillo, JE (reprint author), San Diego State Univ, Dept Math, San Diego, CA 92812 USA. NR 11 TC 2 Z9 2 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0898-1221 J9 COMPUT MATH APPL JI Comput. Math. Appl. PD AUG-SEP PY 2000 VL 40 IS 4-5 BP 523 EP 535 DI 10.1016/S0898-1221(00)00177-2 PG 13 WC Mathematics, Applied SC Mathematics GA 335VZ UT WOS:000088266600008 ER PT J AU Passell, H AF Passell, H TI A common thread to a new global paradigm SO CONSERVATION BIOLOGY LA English DT Letter C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA. RP Passell, H (reprint author), Sandia Natl Labs, POB 5800,MS 1373, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BLACKWELL SCIENCE INC PI MALDEN PA 350 MAIN ST, MALDEN, MA 02148 USA SN 0888-8892 J9 CONSERV BIOL JI Conserv. Biol. PD AUG PY 2000 VL 14 IS 4 BP 924 EP 925 DI 10.1046/j.1523-1739.2000.99l13-2.x PG 2 WC Biodiversity Conservation; Ecology; Environmental Sciences SC Biodiversity & Conservation; Environmental Sciences & Ecology GA 338UV UT WOS:000088442400003 ER PT J AU Kurtis, KE Meyer-Ilse, W Monteiro, PJM AF Kurtis, KE Meyer-Ilse, W Monteiro, PJM TI Soft X-ray spectromicroscopy for in situ study of corrosion SO CORROSION SCIENCE LA English DT Article DE steel; iron; oxidation; microscopy ID MICROSCOPY AB Corrosion of filings from an ASTM Grade 60 steel reinforcing bar was examined in situ using the soft X-ray transmission microscope XM-1, operated by the Center for X-ray Optics and located at the Advanced Light Source at E.O. Lawrence Berkeley National Laboratory. Iron distribution maps generated from X-ray images of a steel filing before and after the addition of water show the change in elemental iron distribution in the sample. The decreased presence of iron in the distribution map after the introduction of water indicates the oxidation of iron - the anodic reaction in steel corrosion. These results demonstrate the utility of transmission soft X-ray microscopy for in, situ corrosion studies. (C) 2000 Elsevier Science Ltd. All rights reserved. C1 Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Xray Opt, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Civil & Environm Engn, Berkeley, CA 94720 USA. RP Kurtis, KE (reprint author), Georgia Inst Technol, Sch Civil & Environm Engn, 790 Atlantic Dr, Atlanta, GA 30332 USA. OI Kurtis, Kimberly/0000-0002-1252-7323 NR 12 TC 6 Z9 7 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0010-938X J9 CORROS SCI JI Corrosion Sci. PD AUG PY 2000 VL 42 IS 8 BP 1327 EP 1336 DI 10.1016/S0010-938X(99)00147-X PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA 323TW UT WOS:000087581900002 ER PT J AU Mazumder, R Pinkart, HC Alban, PS Phelps, TJ Benoit, RE AF Mazumder, R Pinkart, HC Alban, PS Phelps, TJ Benoit, RE TI Low-substrate regulated microaerophilic behavior as a stress response of aquatic and soil bacteria SO CURRENT MICROBIOLOGY LA English DT Article ID ESCHERICHIA-COLI; FATTY-ACIDS; PROTEINS; CYCLOPROPANE; SURVIVAL AB Low-substrate regulated microaerophilic behavior (LSRMB) was observed in 10-54% of the bacteria isolated from several fresh-water lakes or ponds, subsurface soils, activated sludge, and Antarctic dry valley soils. Five Pseudomonas and two Bacillus type species showed LSRMB. A subsurface Pseudomonas jessenii strain was used as a model to show the metabolic interaction between substrate and oxygen concentrations, cell band movement, and the appearance of unique stress lipids and proteins When the oxygen in the P, jessenii culture medium was increased from 11% to 100% saturation under atmospheric condition, the concentration of 17:0 cyclopropane fatty acid, a stress indicator, increased five-fold, and four unique proteins were also detected. This stress response occurred only in low-substrate media. It is our hypothesis that LSRMB is a common but under-appreciated trait of many aquatic and soil bacteria. C1 Virginia Polytech Inst & State Univ, Dept Biol, Blacksburg, VA 24061 USA. Cent Washington Univ, Dept Sci Biol, Ellensburg, WA 98926 USA. Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. RP Benoit, RE (reprint author), Virginia Polytech Inst & State Univ, Dept Biol, Blacksburg, VA 24061 USA. RI phelps, tommy/A-5244-2011 NR 20 TC 12 Z9 14 U1 4 U2 8 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 0343-8651 J9 CURR MICROBIOL JI Curr. Microbiol. PD AUG PY 2000 VL 41 IS 2 BP 79 EP 83 DI 10.1007/s002840010097 PG 5 WC Microbiology SC Microbiology GA 328VV UT WOS:000087872400001 PM 10856370 ER PT J AU Falke, JJ Kim, SH AF Falke, JJ Kim, SH TI Structure of a conserved receptor domain that regulates kinase activity: the cytoplasmic domain of bacterial taxis receptors SO CURRENT OPINION IN STRUCTURAL BIOLOGY LA English DT Article ID LIGAND-BINDING DOMAIN; DISULFIDE CROSS-LINKING; ESCHERICHIA-COLI; ASPARTATE RECEPTOR; SERINE CHEMORECEPTOR; TRANSMEMBRANE DOMAIN; CHEMOTAXIS RECEPTORS; SIGNAL-TRANSDUCTION; HISTIDINE KINASE; 3-DIMENSIONAL STRUCTURE AB Many bacteria are motile and use a conserved class of transmembrane sensory receptor to regulate cellular taxis toward an optimal living environment. These conserved receptors are typically stimulated by extracellular signals, but also undergo adaptation via covalent modification at specific sites on their cytoplasmic domains. The function of the cytoplasmic domain is to integrate the extracellular and adaptive signals, and to use this integrated information to regulate an associated histidine kinase. The kinase, in turn, triggers a cytoplasmic phosphorylation pathway of the two-component class. The high-resolution structure of a receptor cytoplasmic domain has recently been determined by crystallographic methods and is largely consistent with a structural model independently generated by chemical studies of the domain in the full-length, membrane-bound receptor. These results represent an important step toward a mechanistic understanding of receptor-to-kinase information transfer. C1 Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. RP Falke, JJ (reprint author), Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA. FU NCI NIH HHS [R01 CA-78406]; NIGMS NIH HHS [R01 GM040731, R01 GM-40731, R01 GM040731-12] NR 67 TC 42 Z9 42 U1 0 U2 3 PU CURRENT BIOLOGY LTD PI LONDON PA 84 THEOBALDS RD, LONDON WC1X 8RR, ENGLAND SN 0959-440X J9 CURR OPIN STRUC BIOL JI Curr. Opin. Struct. Biol. PD AUG PY 2000 VL 10 IS 4 BP 462 EP 469 DI 10.1016/S0959-440X(00)00115-9 PG 8 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA 343CZ UT WOS:000088685300013 PM 10981636 ER PT J AU Jiles, DC AF Jiles, DC TI Dynamics of domain magnetization and the Barkhausen effect SO CZECHOSLOVAK JOURNAL OF PHYSICS LA English DT Article ID FERROMAGNETIC MATERIALS; WALL DYNAMICS; STRESS; HYSTERESIS; EMISSIONS; FE AB This paper provides a review of the underlying theory of the Barkhausen effect in magnetic materials. The paper contains throughout many of the equations that are commonly used in the mathematical description of this phenomenon. A new contribution in this paper is the examination of how Barkhausen effect can be described in the presence of hysteresis using a. hysteretic-stochastic process model. Although the Barkhausen effect has been known for many years its quantitative description has been rather slow in emerging. One reason for this is that as a result of its random nature the experimental observations are not completely reproducible and this means that the description is necessarily complicated by this fact. Nevertheless a mathematical description is possible and the Barkhausen effect does contain useful information about the details of the magnetization processes occuring on a microscopic scale, both from domain wall motion and domain rotation. This information can only be utilized in conjunction with a model description that can be used to interpret the results. The domain wall motion can be described in terms of two limiting models - flexible domain wall motion and rigid domain wall motion. Both give reasonably tractable mathematical solutions, and each has reversible and irreversible components. Domain rotation also has two limiting models - reversible and irreversible rotation, depending on the anisotropy and the magnitude of the angle of rotation. After having discussed the underlying physical description of the main mechanisms the paper proceeds to describe stochastic process models for Barkhausen effect, in particular recent work by Bertotti et al. It is then shown how the stochastic model can be generalized to include the effects of hysteresis. Finally the paper discusses measurement of the Barkhausen effect and how this can be used for the evaluation of stress and microstructure at the surface of a magnetic material. C1 Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA. Iowa State Univ Sci & Technol, Dept Mat Sci & Engn, Ames, IA 50011 USA. RP Jiles, DC (reprint author), Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA. RI Jiles, David/H-9548-2012 NR 35 TC 88 Z9 92 U1 1 U2 18 PU INST PHYSICS ACAD SCI CZECH REPUBLIC PI PRAGUE PA NA SLOVANCE 2, PRAGUE 182 21, CZECH REPUBLIC SN 0011-4626 J9 CZECH J PHYS JI Czech. J. Phys. PD AUG PY 2000 VL 50 IS 8 BP 893 EP 924 DI 10.1023/A:1022846128461 PG 32 WC Physics, Multidisciplinary SC Physics GA 348VC UT WOS:000089006300001 ER PT J AU Sohn, H Law, KH AF Sohn, H Law, KH TI Bayesian probabilistic damage detection of a reinforced-concrete bridge column SO EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS LA English DT Article DE damage detection; Bayesian probabilistic approach; continuous monitoring; vibration test; bridge column structure ID UPDATING MODELS; STIFFNESS; UNCERTAINTIES; ADJUSTMENT AB A Bayesian probabilistic approach for damage detection has been proposed for the continuous monitoring of civil structures (Sohn H, Law KH. Bayesian probabilistic approach for structure damage detection. Earthquake Engineering and Structural Dynamics 1997; 26: 1259-1281). This paper describes the application of the Bayesian approach to predict the location of plastic hinge deformation using the experimental data obtained from the vibration tests of a reinforced-concrete bridge column. The column was statically pushed incrementally with lateral displacements until a plastic hinge is fully formed at the bottom portion of the column. Vibration tests were performed at different damage stages. The proposed damage detection method was able to locate the damaged region using a simplified analytical model and the modal parameters estimated from the vibration tests, although (1) only the first bending and first torsional modes were estimated from the experimental test data, (2) the locations where the accelerations were measured did not coincide with the degrees of freedom of the analytical model, and (3) there existed discrepancies between the undamaged test structure and the analytical model. The Bayesian framework was able to systematically update the damage probabilities when new test data became available. Better diagnosis was obtained by employing multiple data sets than just by using each test data set separately. Copyright (C) 2000 John Wiley & Sons, Ltd. C1 Univ Calif Los Alamos Natl Lab, Engn Sci & Applicat Div, Engn Anal Grp, Los Alamos, NM 87545 USA. Stanford Univ, Dept Civil & Environm Engn, Stanford, CA 94305 USA. RP Sohn, H (reprint author), Univ Calif Los Alamos Natl Lab, Engn Sci & Applicat Div, Engn Anal Grp, ESA-EA MS-C926, Los Alamos, NM 87545 USA. NR 22 TC 21 Z9 25 U1 0 U2 4 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX PO19 1UD, ENGLAND SN 0098-8847 J9 EARTHQUAKE ENG STRUC JI Earthq. Eng. Struct. Dyn. PD AUG PY 2000 VL 29 IS 8 BP 1131 EP 1152 DI 10.1002/1096-9845(200008)29:8<1131::AID-EQE959>3.0.CO;2-J PG 22 WC Engineering, Civil; Engineering, Geological SC Engineering GA 340XC UT WOS:000088560700004 ER PT J AU Snodgrass, JW Bryan, AL Burger, J AF Snodgrass, JW Bryan, AL Burger, J TI Development of expectations of larval amphibian assemblage structure in southeastern depression wetlands SO ECOLOGICAL APPLICATIONS LA English DT Article DE amphibians; biological monitoring; Carolina bays; community structure; fish; hydroperiod; reference conditions; Savannah River Site; South Carolina; species richness; wetlands ID EXPERIMENTAL POND COMMUNITIES; UPPER COASTAL-PLAIN; NATURAL FLUCTUATIONS; FISH ASSEMBLAGES; SOUTH-CAROLINA; HUMAN IMPACTS; POPULATIONS; HYDROLOGY; RICHNESS; PATTERNS AB We surveyed larval amphibians and fish in 25 relatively pristine depression wetlands on the upper Atlantic coastal plain of South Carolina to examine relationships among hydroperiod length, fish presence/absence and larval amphibian assemblage structure. Our goals were to test the application of general models of lentic community structure to Southeastern depression wetlands and to develop expectations of larval amphibian assemblage structure at reference sites. Amphibian species richness showed a unimodal pattern along a hydroperiod gradient, with wetlands that contained water for 8-10 mo/yr having the highest species richness. Wetlands that contained water for longer periods (i.e., dried only during severe drought) often contained fish and had relatively low amphibian species richness. Most species occurred along a restricted portion of the hydroperiod gradient, and some species were found almost exclusively in wetlands with fish. Associations among the occurrence of species led to relatively discrete breaks in assemblage structure along the hydroperiod gradient. Canonical correspondence analysis of catch-per-unit-effort data identified four groups of wetlands with similar assemblage structure: (1) short (drying in spring), (2) medium (drying in summer), and (3) long (drying in fall or semi-annually) hydroperiod wetlands without fish; and (4) long hydroperiod wetlands with fish. Our results suggest that general models of community structure in lentic systems are applicable to southeastern isolated wetlands and should form the basis for developing expectations of larval amphibian assemblage structure in these systems. C1 Rutgers State Univ, Environm & Occupat Hlth Sci Inst, Div Life Sci, Piscataway, NJ 08855 USA. Rutgers State Univ, Environm & Occupat Hlth Sci Inst, CRESP, Piscataway, NJ 08855 USA. Univ Georgia, Savannah River Ecol Lab, Aiken, SC 29802 USA. RP Snodgrass, JW (reprint author), Towson Univ, Dept Biol, Towson, MD 21252 USA. RI Snodgrass, Joel/C-5288-2016; OI Snodgrass, Joel/0000-0002-4436-8750 NR 42 TC 49 Z9 51 U1 1 U2 20 PU ECOLOGICAL SOC AMER PI WASHINGTON PA 1707 H ST NW, STE 400, WASHINGTON, DC 20006-3915 USA SN 1051-0761 J9 ECOL APPL JI Ecol. Appl. PD AUG PY 2000 VL 10 IS 4 BP 1219 EP 1229 DI 10.2307/2641028 PG 11 WC Ecology; Environmental Sciences SC Environmental Sciences & Ecology GA 339UJ UT WOS:000088496000021 ER PT J AU Mulholland, PJ Tank, JL Sanzone, DM Wollheim, WM Peterson, BJ Webster, JR Meyer, JL AF Mulholland, PJ Tank, JL Sanzone, DM Wollheim, WM Peterson, BJ Webster, JR Meyer, JL TI Nitrogen cycling in a forest stream determined by a N-15 tracer addition SO ECOLOGICAL MONOGRAPHS LA English DT Article DE ammonium uptake length; N-15; gross primary production; nitrate uptake length; nitrification; nitrogen cycling; respiration; stable isotope; stream ecosystem; tracer addition ID AMMONIA DIFFUSION METHOD; OXYGEN CHANGE TECHNIQUE; WOODLAND STREAM; CHLOROFORM FUMIGATION; LEAF DECOMPOSITION; CONIFEROUS FOREST; HEADWATER STREAM; SOIL-NITROGEN; FRESH-WATERS; TUNDRA RIVER AB Nitrogen uptake and cycling was examined using a six-week tracer addition of N-15-labeled ammonium in early spring in Walker Branch, a first-order deciduous forest stream in eastern Tennessee. Prior to the N-15 addition, standing stocks of N were determined for the major biomass compartments. During and after the addition, 15N was measured in water and in dominant biomass compartments upstream and at several locations downstream. Residence time of ammonium in stream water (5-6 min) and ammonium uptake lengths (23-27 m) were short and relatively constant during the addition. Uptake rates of NH4 were more variable, ranging from 22 to 37 mu g N.m(-2).min(-1) and varying directly with changes in streamwater ammonium concentration (2.7-6.7 mu g/L). The highest rates of ammonium uptake per unit area were by the liverwort Porella pinnata, decomposing leaves, and fine benthic organic matter (FBOM), although epilithon had the highest N uptake per unit biomass N. Nitrification rates and nitrate uptake lengths and rates were determined by fitting a nitrification/nitrate uptake model to the longitudinal profiles of N-15-NO3 flux. Nitrification was an important sink for ammonium in stream water, accounting for 19% of the total ammonium uptake rate. Nitrate production via coupled regeneration/nitrification of organic N was about one-half as large as nitrification of streamwater ammonium. Nitrate uptake lengths were longer and more variable than those for ammonium, ranging from 101 m to infinity. Nitrate uptake rate varied from 0 to 29 mu g.m(-2).min(-1) and was similar to 1.6 times greater than assimilatory ammonium uptake rate early in the tracer addition. A sixfold decline in instream gross primary production rate resulting from a sharp decline in light level with leaf emergence had little effect on ammonium uptake rate but reduced nitrate uptake rate by nearly 70%. At the end of the addition, 64-79% of added N-15 was accounted for, either in biomass within the 125-m stream reach (33-48%) or as export of N-15-NH4 (4%), N-15-NO3 (23%), and fine particulate organic matter (4%) from the reach, Much of the N-15 not accounted for was probably lost downstream as transport of particulate organic N during a storm midway through the experiment or as dissolved organic N produced within the reach. Turnover rates of a large portion of the N-15 taken up by biomass compartments were high (0.04-0.08 per day), although a substantial portion of the N-15 in Porella (34%), FBOM (21%), and decomposing wood (17%) at the end of the addition was retained 75 d later, indicating relatively long-term retention of some N taken up from water. In total, our results showed that ammonium retention and nitrification rates were high in Walker Branch, and that the downstream loss of N was primarily as nitrate and was controlled largely by nitrification, assimilatory demand for N, and availability of ammonium to meet that demand. Our results are consistent with recent N-15 tracer experiments in N-deficient forest soils that showed high rates of nitrification and the importance of nitrate uptake in regulating losses of N. Together these studies demonstrate the importance of N-15 tracer experiments for improving our understanding of the complex processes controlling N cycling and loss in ecosystems. C1 Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. Univ Illinois, Dept Nat Resources & Environm Sci, Urbana, IL 61801 USA. Univ Georgia, Inst Ecol, Athens, GA 30602 USA. Marine Biol Lab, Ctr Ecosyst, Woods Hole, MA 02543 USA. Virginia Polytech Inst & State Univ, Dept Biol, Blacksburg, VA 24061 USA. 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; OI Webster, Jackson/0000-0002-2649-0867 NR 59 TC 176 Z9 181 U1 9 U2 106 PU ECOLOGICAL SOC AMER PI WASHINGTON PA 1990 M STREET NW, STE 700, WASHINGTON, DC 20036 USA SN 0012-9615 EI 1557-7015 J9 ECOL MONOGR JI Ecol. Monogr. PD AUG PY 2000 VL 70 IS 3 BP 471 EP 493 DI 10.1890/0012-9615(2000)070[0471:NCIAFS]2.0.CO;2 PG 23 WC Ecology SC Environmental Sciences & Ecology GA 340JJ UT WOS:000088529100006 ER PT J AU Johnson, CS Vaughey, JT Thackeray, MM Sarakonsri, T Hackney, SA Fransson, L Edstrom, K Thomas, JO AF Johnson, CS Vaughey, JT Thackeray, MM Sarakonsri, T Hackney, SA Fransson, L Edstrom, K Thomas, JO TI Electrochemistry and in-situ X-ray diffraction of InSb in lithium batteries SO ELECTROCHEMISTRY COMMUNICATIONS LA English DT Article DE lithium batteries; intermetallic; indium-antimony/antimonide; zinc blende; insertion electrode ID ELECTRODES AB The electrochemical reactions of lithium with the intermetallic compound, InSb, were studied in lithium coin cells using laminate electrodes fabricated from either single-crystal InSb wafers or ball-milled samples. In-situ X-ray diffraction data show that the InSb zinc-blende framework is unstable to extensive reaction with lithium: In is extruded from a fixed Sb lattice during 'discharge' and is partially incorporated hack into the lattice during 'charge'. Despite the loss of some In from the structure, the indium antimonide electrode provides capacities in excess of 300 mAh/g with excellent reversibility. Cyclic voltammetry was used to study the electrochemical processes in greater detail. Lithiated indium products are formed below similar to 600 mV versus Li. The electrode can be discharged at high rates, delivering 150 mAh/g at 3.6 mA/cm(2) between 1.2 and 0.2 V Versus Li. These data hold exciting prospects for the development of intermetallic insertion electrodes for practical room-temperature Li-ion cells. Published by Elsevier Science S.A. C1 Argonne Natl Lab, Div Chem Technol, Electrochem Technol Program, Argonne, IL 60439 USA. Michigan Technol Univ, Dept Met & Mat Engn, Houghton, MI 49931 USA. Uppsala Univ, Angstrom Lab, SE-75121 Uppsala, Sweden. RP Thackeray, MM (reprint author), Argonne Natl Lab, Div Chem Technol, Electrochem Technol Program, 9700 S Cass Ave, Argonne, IL 60439 USA. OI Vaughey, John/0000-0002-2556-6129; Edstroem, Kristina/0000-0003-4440-2952 NR 14 TC 62 Z9 65 U1 3 U2 27 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 USA SN 1388-2481 J9 ELECTROCHEM COMMUN JI Electrochem. Commun. PD AUG PY 2000 VL 2 IS 8 BP 595 EP 600 DI 10.1016/S1388-2481(00)00087-4 PG 6 WC Electrochemistry SC Electrochemistry GA 341QX UT WOS:000088602000009 ER PT J AU Sezgen, O Koomey, JG AF Sezgen, O Koomey, JG TI Interactions between lighting and space conditioning energy use in US commercial buildings SO ENERGY LA English DT Article AB Reductions in lighting energy have secondary effects on cooling and heating energy consumption. In general, lighting energy reductions increase heating and decrease cooling requirements of a building. The net change in a building's annual energy requirements, however, is difficult to quantify and depends on the building characteristics, operating conditions, and climate. This paper characterizes the effects of lighting/HVAC interactions on the annual heating/cooling requirements of prototypical US commercial buildings through computer simulations using the DOE-2.1E building energy analysis program, Twelve building types of two vintages and five climates are chosen to represent the US commercial building stock. For each combination of building type, vintage, and climate, a prototypical building is simulated with varying lighting power densities, and the resultant changes in heating and cooling loads are recorded. These loads are used together with market information on the saturation of the different HVAC equipment in commercial buildings to determine the changes in energy use and expenditures for heating and cooling. Results are presented by building type for the US as a whole. Therefore, the data presented in this paper can be used to assess the secondary effects of lighting-related federal policies with widespread impacts, such as minimum efficiency standards. Generally, in warm climates the interactions will induce monetary savings and in cold climates the interactions will induce monetary penalties. For the commercial building stock in the US, a reduction in lighting energy that is well distributed geographically will induce neither significant savings nor significant penalties from associated changes in HVAC primary energy and energy expenditures. Published by Elsevier Science Ltd. All rights reserved. C1 Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Energy Anal Dept, Environm Technol Div, Berkeley, CA 94720 USA. RP Sezgen, O (reprint author), Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Energy Anal Dept, Environm Technol Div, MS 90-4000, Berkeley, CA 94720 USA. NR 11 TC 19 Z9 19 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0360-5442 J9 ENERGY JI Energy PD AUG PY 2000 VL 25 IS 8 BP 793 EP 805 DI 10.1016/S0360-5442(99)00085-7 PG 13 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA 329EM UT WOS:000087893800008 ER PT J AU Sinton, JE Fridley, DG AF Sinton, JE Fridley, DG TI What goes up: recent trends in China's energy consumption SO ENERGY POLICY LA English DT Article DE China; energy consumption; coal; energy intensity; energy efficiency AB Since 1996, China's energy output has dropped by 17%, while primary energy use has fallen by 4%, driven almost entirely by shrinking output from coal mines and declining direct use. Since China is the world's second-largest emitter of greenhouse gases, it is important to understand the: sources of this apparent transformation, and whether it portends a permanent change in patterns of energy use. This remarkable reversal of the long-term expansion of energy use has occurred even as the economy has continued to grow, albeit more slowly than in the early 1990s. Generation of electric power has risen, implying a steep fall in end uses, particularly in industry. Available information points to a variety of forces contributing to this phenomenon, including rapid improvements in coal quality, structural changes in industry, shutdowns of factories in both the state-owned and non-state segments of the economy, improvements in end-use efficiency, and greater use of gas and electricity in households. A combination of slowing economic growth, industrial restructuring, broader economic system reforms, and environmental and energy-efficiency policies has apparently led to at least a temporary decline in, and perhaps a long-term reduction in the growth of energy use, and therefore greenhouse gas emissions. (C) 2000 Elsevier Science Ltd. All rights reserved. C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Energy Anal Dept, Berkeley, CA 94720 USA. RP Sinton, JE (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Energy Anal Dept, Berkeley, CA 94720 USA. RI feng, tingting/A-9545-2012 NR 42 TC 148 Z9 156 U1 3 U2 35 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0301-4215 J9 ENERG POLICY JI Energy Policy PD AUG PY 2000 VL 28 IS 10 BP 671 EP 687 DI 10.1016/S0301-4215(00)00053-7 PG 17 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA 327XD UT WOS:000087819000002 ER PT J AU Iino, F Imagawa, T Gullett, BK AF Iino, F Imagawa, T Gullett, BK TI Dechlorination controlled polychlorinated dibenzofuran isomer patterns from municipal waste incinerators SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID DE-NOVO SYNTHESIS; FLY-ASH; AROMATIC-COMPOUNDS; CHLORINATED BENZENES; PARA-DIOXINS; P-DIOXINS; PHENOLS; MECHANISMS; COMBUSTION; PCDD/PCDF AB The ability to predict polychlorinated dibenzofuran (PCDF) isomer patterns from municipal waste incinerators (MWIs) enables an understanding of PCDF formation that may lead to preventive measures. This work develops a model for the pattern prediction, assuming that the chromatograph peak ratios relative to the total four heptachloro-dibenzofuran (H7CDF) isomers are determined by position-specific dechlorination kinetics from an octachloro-dibenzofuran (08CDF) parent to H7CDFs and that these probabilities can subsequently predict the relative concentrations of lower chlorinated isomers. Agreement of PCDF isomer patterns between the model and sampled data from eight MWIs is consistent with formation of tetrachloro-dibenzofurans to H7CDFs by dechlorination from an 08CDF parent. The application of the analogous theory to predict isomer patterns of polychlorinated dibenzo-p-dioxins (PCDDs) did not provide any significant results, which implies that the formation mechanism of PCDDs is controlled by other factors such as condensation of precursors and further chlorination. This method can be a fundamental basis to develop a prediction model for total PCDFs emission and toxic equivalent values. C1 US EPA, Natl Risk Management Res Lab, Air Pollut Prevent & Control Div, Air Pollut Technol Branch, Res Triangle Pk, NC 27711 USA. Natl Inst Resources & Environm, Tsukuba, Ibaraki 3058569, Japan. Oak Ridge Inst Sci & Educ, Oak Ridge, TN 37831 USA. RP Gullett, BK (reprint author), US EPA, Natl Risk Management Res Lab, Air Pollut Prevent & Control Div, Air Pollut Technol Branch, MD-65, Res Triangle Pk, NC 27711 USA. NR 29 TC 33 Z9 34 U1 2 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD AUG 1 PY 2000 VL 34 IS 15 BP 3143 EP 3147 DI 10.1021/es9913131 PG 5 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA 340XF UT WOS:000088561100028 ER PT J AU Bender, J Duff, MC Phillips, P Hill, M AF Bender, J Duff, MC Phillips, P Hill, M TI Bioremediation and bioreduction of dissolved U(VI) by microbial mat consortium supported on silica gel particles SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID SULFATE-REDUCING BACTERIA; SAN-JOAQUIN VALLEY; DESULFOVIBRIO-DESULFURICANS; INDIGENOUS BACTERIA; URANIUM REDUCTION; WATER; REMOVAL; SPECIATION; CALIFORNIA; SEDIMENTS AB The goal of this research was to simulate natural attenuation processes for uranium (U) by constructing a bioremediation system based on microbial mats. Ancient microbial consortia, such as microbial mats, have evolved the capacity to manage hostile environments and potentially bioremediate metal-contaminated water. To facilitate the engineering applications of microbial mats, the constituent microbial groups of the mat consortium were immobilized with required nutrients in silica gel. Resulting silica mat particles (SMP) were tested for efficiency in removing and, subsequently, reducing U(VI) to U(IV). Uranium-containing groundwaters from a Superfund Site (0.2 mg U(VI) L-1, 293 mg HCO3 L-1 at pH 8.2) and synthetic waters (similar to 0.05-2 mg U(VI) L-1, pH 8-9) were assessed with this system. Over 80% of the dissolved U(VI), present as mostly U(VI)-carbonate (Superfund) or U(VI)-hydrolysis species (synthetic), was removed by the SMP within 15 min of treatment. X-ray absorption near-edge structure spectroscopy studies showed that the U sequestered in the SMP was reduced to U(IV) within 24 h of exposure. Effective sequential batch treatments and maintenance of a low redox environment by nutrient additions demonstrated the potential for long-term durability and capacity for continuous use of this system. Drying the SMP produced a hard compact product (1% of original weight). Capacity for on-site generation of SMP, relative low-cost constituent materials, the simplicity of management, and the formation of a stable compact disposal product indicate this system has great potential for the field remediation of U-contaminated waters. C1 Univ Georgia, Savannah River Ecol Lab, Adv Analyt Ctr Environm Sci, Aiken, SC 29802 USA. Clark Atlanta Univ, Res Ctr Sci & Technol, Atlanta, GA 30314 USA. Winthrop Univ, Dept Biol, Rock Hill, SC 29733 USA. RP Duff, MC (reprint author), Univ Georgia, Savannah River Ecol Lab, Adv Analyt Ctr Environm Sci, Drawer E, Aiken, SC 29802 USA. NR 38 TC 33 Z9 35 U1 0 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD AUG 1 PY 2000 VL 34 IS 15 BP 3235 EP 3241 DI 10.1021/es9914184 PG 7 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA 340XF UT WOS:000088561100043 ER PT J AU Butler, LG Owens, JW Cartledge, FK Kurtz, RL Byerly, GR Wales, AJ Bryant, PL Emery, EF Dowd, B Xie, XG AF Butler, LG Owens, JW Cartledge, FK Kurtz, RL Byerly, GR Wales, AJ Bryant, PL Emery, EF Dowd, B Xie, XG TI Synchrotron X-ray microtomography, electron probe microanalysis, and NMR of toluene waste in cement SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID POROUS-MEDIA; SOLIDIFICATION; STABILIZATION; HYDRATION AB Synchrotron X-ray microtomography shows vesicular structures for toluene/cement mixtures, prepared with 1.22-3.58 wt% toluene. Three-dimensional imaging of the cured samples shows spherical vesicles, with diameters ranging from 20 to 250 mu m; a search with EPMA for vesicles in the range of 1-20 mu m proved negative. However, the total vesicle volume, as computed from the microtomography images, accounts for less than 10% of initial toluene. Since the cements were cured in sealed bottles, the larger portion of toluene must be dispersed within the cement matrix. Evidence for toluene in the cement matrix comes from Si-29 MAS NMR spectroscopy, which shows a reduction in chain silicates with added toluene. Also H-2 NMR Of toluene-d(8)/cement samples shows high mobility for all toluene and thus no toluene/cement binding. A model that accounts for all observations follows: For loadings below about 3 wt%, most toluene is dispersed in the cement matrix, with a small fraction of the initial toluene phase separating from the cement paste and forming vesicular structures that are preserved in the cured cement and quantitatively imaged with tomography. Furthermore, at loadings above 3 wt%, the abundance of vesicles formed during toluene/cement paste mixing leads to macroscopic phase separation (most toluene floats to the surface of the cement paste). C1 Louisiana State Univ, Dept Chem, Baton Rouge, LA 70803 USA. Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA. Louisiana State Univ, Dept Geol & Geophys, Baton Rouge, LA 70803 USA. Southern Univ, Dept Chem, Baton Rouge, LA USA. Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11193 USA. RP Butler, LG (reprint author), Louisiana State Univ, Dept Chem, Baton Rouge, LA 70803 USA. RI Byerly, Gary Ray/D-7316-2012; Butler, Leslie/D-1636-2016 OI Byerly, Gary Ray/0000-0003-4400-6909; Butler, Leslie/0000-0003-1547-608X NR 45 TC 9 Z9 10 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD AUG 1 PY 2000 VL 34 IS 15 BP 3269 EP 3275 DI 10.1021/es990450v PG 7 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA 340XF UT WOS:000088561100048 ER PT J AU O'Loughlin, EJ Traina, SJ Chin, YP AF O'Loughlin, EJ Traina, SJ Chin, YP TI Association of organotin compounds with aquatic and terrestrial humic substances SO ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY LA English DT Article DE tributyltin; organotin; humic; fulvic; binding ID SIMULATED ESTUARINE CONDITIONS; DISSOLVED ORGANIC-MATTER; TRIORGANOTIN COMPOUNDS; MOLECULAR-WEIGHT; TRIBUTYLTIN; WATER; SORPTION; ACIDS; BEHAVIOR; TIN AB Organotin-humic substance (OT-HS) binding constants (K-doc) were determined by equilibrium-binding studies using dialysis techniques. The OT-HS binding was characterized by linear isotherms. The K-doc values measured in this study were several orders of magnitude greater than would be predicted based only on nonpolar interactions with HS las estimated by K-ow). Binding of tri-n-butyltin (TBT) by Aldrich humic acid decreased with increasing salinity and pH, indicating that ionic interactions predominate in TBT-HS binding. Thus, the binding of OT by HS observed in this study occurs primarily through complexation, with secondary contributions from nonpolar interactions. The effects of the physicochemical properties of HS (e.g., molecular weight, % aromaticity, oxygen content) on TBT-HS binding was examined with HS from a range of sources, including a commercial humic acid and HS from aquatic and terrestrial sources. Although binding of organic contaminants by HS has been correlated with various structural features of HS, no meaningful relationship between any of the HS properties examined in this study and the extent of TBT-HS binding was found. C1 Ohio State Univ, Environm Sci Grad Program, Columbus, OH 43210 USA. Ohio State Univ, Sch Nat Resources, Columbus, OH 43210 USA. Ohio State Univ, Dept Geol Sci, Columbus, OH 43210 USA. RP O'Loughlin, EJ (reprint author), Argonne Natl Lab, Div Environm Res, Argonne, IL 60439 USA. RI O'Loughlin, Edward/C-9565-2013 OI O'Loughlin, Edward/0000-0003-1607-9529 NR 46 TC 16 Z9 17 U1 0 U2 3 PU SETAC PI PENSACOLA PA 1010 NORTH 12TH AVE, PENSACOLA, FL 32501-3367 USA SN 0730-7268 J9 ENVIRON TOXICOL CHEM JI Environ. Toxicol. Chem. PD AUG PY 2000 VL 19 IS 8 BP 2015 EP 2021 DI 10.1897/1551-5028(2000)019<2015:AOOCWA>2.3.CO;2 PG 7 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA 339UL UT WOS:000088496200009 ER PT J AU Matson, CW Rodgers, BE Chesser, RK Baker, RJ AF Matson, CW Rodgers, BE Chesser, RK Baker, RJ TI Genetic diversity of Clethrionomys glareolus populations from highly contaminated sites in the Chornobyl Region, Ukraine SO ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY LA English DT Article DE population genetics; Clethrionomys; radiation; Chornobyl; evolutionary toxicology ID MITOCHONDRIAL-DNA; NATURAL-POPULATIONS; CHERNOBYL ACCIDENT; BANK VOLE; DYNAMICS; RUFOCANUS; HETEROPLASMY; MUTATION; HOKKAIDO; SCRIPTA AB At radioactive sites, at least two mechanisms may affect the genetic diversity of populations of a given species. Increased mutation rates due to radiation exposure may increase the amount of genetic diversity in a population. Alternatively, population bottlenecks exacerbated by environmental degradation may lead to a reduction of diversity. The relationship between these two contradictory forces is complex. To explore this relationship, long-term monitoring of a genetic marker within a population is needed. To provide baseline data on the population genetics of the bank vole (Clethrionomys glareolus) living in the most contaminated regions at Chornobyl, Ukraine, we have sequenced 291 base pairs of the mitochondrial DNA control region. Bank voles were chosen as a model system because they have the highest levels of internal dose of cesium-134, cesium-137, and strontium-90 within the Chornobyl exclusion zone. We sampled three geographic sites, which were Oranoe, a reference site with virtually no radioactive contamination (<2 Ci/km(2)), and two highly contaminated sites, Glyboke Lake and the Red Forest (both 1,000 Ci/km(2)). Genetic diversity in the population from Red Forest (0.722 +/- 0.024) was significantly greater than at the Oranoe reference site (0.615 +/- 0.039), while genetic diversity at Glyboke Lake (0.677 +/- 0.068) was intermediate. It is concluded that long-term studies of historical and demographic characteristics for experimental and reference populations are required in order to employ population genetics to understand the biological impact of environmental contaminants on the genetics of natural populations. C1 Texas Tech Univ, Dept Biol Sci, Lubbock, TX 79409 USA. Univ Georgia, Savannah River Ecol Lab, Aiken, SC 29802 USA. RP Baker, RJ (reprint author), Texas Tech Univ, Dept Biol Sci, Lubbock, TX 79409 USA. RI Matson, Cole/F-7992-2010 OI Matson, Cole/0000-0002-6472-9357 NR 30 TC 32 Z9 37 U1 4 U2 13 PU SETAC PI PENSACOLA PA 1010 NORTH 12TH AVE, PENSACOLA, FL 32501-3367 USA SN 0730-7268 J9 ENVIRON TOXICOL CHEM JI Environ. Toxicol. Chem. PD AUG PY 2000 VL 19 IS 8 BP 2130 EP 2135 DI 10.1897/1551-5028(2000)019<2130:GDOCGP>2.3.CO;2 PG 6 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA 339UL UT WOS:000088496200024 ER PT J AU Ranatunga, TD Jervis, J Helm, RF McMillan, JD Wooley, RJ AF Ranatunga, TD Jervis, J Helm, RF McMillan, JD Wooley, RJ TI The effect of overliming on the toxicity of dilute acid pretreated lignocellulosics: the role of inorganics, uronic acids and ether-soluble organics SO ENZYME AND MICROBIAL TECHNOLOGY LA English DT Article DE overliming; lignocellulosics; Zymomonas; uronic acids; ether-soluble organics; ethanol ID ETHANOL-PRODUCTION; PICHIA-STIPITIS; SACCHAROMYCES-CEREVISIAE; ZYMOMONAS-MOBILIS; WOOD SUGARS; FERMENTATION; HYDROLYZATE; CONVERSION; HARDWOOD; BIOMASS AB Although the treatment of dilute acid pretreated lignocellulosics with calcium hydroxide or carbonate (overliming) is known to improve the fermentability of carbohydrate-rich hydrolyzate streams, a firm understanding of the chemistry behind the process is lacking. Quantitative evaluation of inorganics, uronic acids, and non-polar organics indicates that only a portion of the improvement can be ascribed to these materials. Upon overliming. the concentrations of inorganics either increase (Ca, Mg), decrease (Fe, P, Zn, K) or remain relatively the same (Al. Na). Furthermore, organic compounds that are not extractable with tert-butyl methyl ether (MTBE) are toxic to Zymomonas,mobilis CP4(pZB5). Overliming and direct neutralization are somewhat effective in removing sulfate anions, although sulfate toxicity is considerably less than that of acetic acid. Uronic acids were found to be non-toxic under pH controlled conditions. (C) 2000 Elsevier Science Inc. All rights reserved. C1 Virginia Polytech Inst & State Univ, Fralin Biotechnol Ctr, Dept Wood Sci & Forest Prod, Blacksburg, VA 24061 USA. Natl Renewable Energy Lab, Biotechnol Ctr Fuels & Chem, Golden, CO 80401 USA. RP Helm, RF (reprint author), Virginia Polytech Inst & State Univ, Fralin Biotechnol Ctr, Dept Wood Sci & Forest Prod, Blacksburg, VA 24061 USA. OI Helm, Richard/0000-0001-5317-0925 NR 30 TC 63 Z9 66 U1 1 U2 10 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 USA SN 0141-0229 J9 ENZYME MICROB TECH JI Enzyme Microb. Technol. PD AUG PY 2000 VL 27 IS 3-5 BP 240 EP 247 DI 10.1016/S0141-0229(00)00216-7 PG 8 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA 335KC UT WOS:000088241800007 ER PT J AU Hessberger, FP Hofmann, S Ackermann, D Ninov, V Leino, M Saro, S Andreyev, A Lavrentev, A Popeko, AG Yeremin, AV AF Hessberger, FP Hofmann, S Ackermann, D Ninov, V Leino, M Saro, S Andreyev, A Lavrentev, A Popeko, AG Yeremin, AV TI Decay properties of neutron-deficient nuclei in the region Z=86-92 SO EUROPEAN PHYSICAL JOURNAL A LA English DT Article ID ISOMERIC STATE; ALPHA-DECAYS; ISOTOPES; PARTICLES; U-226 AB Neutron deficient isotopes of elements Z = 86-92 have been produced by heavy-ion fusion reactions C-12 + Pb-208, Bi-209, Ne-22 + Pb-208; V-51 + Er-170, and Ti-50 + Er-170. The evaporation residues were investigated by means of alpha- and alpha-gamma -spectroscopy after in-flight separation from the projectile beam by the velocity filter SHIP and implantation into a 16-strip position-sensitive Si-detector. New or improved decay data for U-225,U-226, Pa-216,Pa-217m,Pa-218, Th-215,Th-216,Th-217, Ac-214,Ac-215,Ac-216,Ac-216m, Ra-214 and Rn-213 have been obtained. C1 Gesell Schwerionenforsch GmbH, D-64220 Darmstadt, Germany. Univ Mainz, Inst Phys, D-55099 Mainz, Germany. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Jyvaskyla, Dept Phys, FIN-40351 Jyvaskyla, Finland. Comenius Univ, Dept Phys Nucl, SK-84215 Bratislava, Slovakia. Joint Inst Nucl Res, Frank Lab Neutron Phys, Dubna 141980, Russia. Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England. Katholieke Univ Leuven, Inst Kern Stralingsfys, B-3001 Louvain, Belgium. Joint Inst Nucl Res Dubna, Flerov Lab Nucl React, Dubna 141980, Russia. RP Hessberger, FP (reprint author), Gesell Schwerionenforsch GmbH, D-64220 Darmstadt, Germany. OI Ackermann, Dieter/0000-0001-6284-1516 NR 33 TC 36 Z9 36 U1 0 U2 5 PU SPRINGER-VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 1434-6001 J9 EUR PHYS J A JI Eur. Phys. J. A PD AUG PY 2000 VL 8 IS 4 BP 521 EP 535 DI 10.1007/s100500070075 PG 15 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA 370TD UT WOS:000165137600011 ER PT J AU Breitweg, J Chekanov, S Derrick, M Krakauer, D Magill, S Musgrave, B Pellegrino, A Repond, J Stanek, R Yoshida, R Mattingly, MCK Abbiendi, G Anselmo, F Antonioli, P Bari, G Basile, M Bellagamba, L Boscherini, D Bruni, A Bruni, G Romeo, GC Castellini, G Cifarelli, L Cindolo, F Contin, A Coppola, N Corradi, M De Pasquale, S Giusti, P Iacobucci, G Laurenti, G Levi, G Margotti, A Massam, T Nania, R Palmonari, F Pesci, A Polini, A Sartorelli, G Garcia, YZ Zichichi, A Amelung, C Bornheim, A Brock, I Coboken, K Crittenden, J Deffner, R Hartmann, K Heinloth, K Hilger, E Irrgang, P Jakob, HP Kappes, A Katz, UF Kerger, R Paul, E Schnurbusch, H Stifutkin, A Tandler, J Voss, KC Weber, A Wieber, H Bailey, DS Barret, O Brook, NH Foster, B Heath, GP Heath, HF McFall, JD Piccioni, D Rodrigues, E Scott, J Tapper, RJ Capua, M Mastroberardino, A Schioppa, M Susinno, G Jeoung, HY Kim, JY Lee, JH Lim, IT Ma, KJ Pac, MY Caldwell, A Liu, W Liu, X Mellado, B Paganis, S Sacchi, R Sampson, S Sciulli, F Chwastowski, J Eskreys, A Figiel, J Klimek, K Olkiewicz, K Piotrzkowski, K Przybycien, MB Stopa, P Zawiejski, L Adamczyk, L Bednarek, B Jelen, K Kisielewska, D Kowal, AM Kowalski, T Przybycien, M Rulikowska-Zarebska, E Suszycki, L Szuba, D Kotanski, A Bauerdick, LAT Behrens, U Bienlein, JK Burgard, C Desler, K Drews, G Fox-Murphy, A Fricke, U Goebel, F Gottlicher, P Graciani, R Haas, T Hain, W Hartner, GF Hasell, D Hebbel, K Johnson, KF Kasemann, M Koch, W Kotz, U Kowalski, H Lindemann, L Lohr, B Martinez, M Milite, M Monteiro, T Moritz, M Notz, D Pelucchi, F Petrucci, MC Rohde, M Saull, PRB Savin, AA Schneekloth, U Selonke, F Sievers, M Stonjek, S Tassi, E Wolf, G Wollmer, U Youngman, C Zeuner, W Coldewey, C Grabosch, HJ Viani, ALD Meyer, A Schlenstedt, S Straub, PB Barbagli, C Gallo, E Pelfer, P Maccarrone, C Votano, L Bamberger, A Benen, A Eisenhardt, S Markun, P Raach, H Wolfle, S Bussey, PJ Doyle, AT Lee, SW Macdonald, N McCance, GJ Saxon, DH Sinclair, LE Skillicorn, IO Waugh, R Bohnet, I Gendner, N Holm, U Meyer-Larsen, A Salehi, H Wick, K Dannheim, D Garfagnini, A Gialas, I Gladilin, LK Kcira, D Klanner, R Lohrmann, E Poelz, G Zetsche, F Goncalo, R Long, KR Miller, DB Tapper, AD Walker, R Mallik, U Cloth, P Filges, D Ishii, T Kuze, M Nagano, K Tokushuku, K Yamada, S Yamazaki, Y Ahn, SH Lee, SB Park, SK Lim, H Park, IH Son, D Barreiro, F Garcia, G Glasman, C Gonzalez, O Labarga, L del Peso, J Redondo, I Terron, J Barbi, M Corriveau, F Hanna, DS Ochs, A Padhi, S Riveline, M Stairs, DG Wing, M Tsurugai, T Bashkirov, V Dologshein, BA Dementiev, RK Ermolov, PF Golubkov, YA Katkov, II Khein, LA Korotkova, NA Korzhavina, IA Kuzmin, VA Lukina, OY Proskuryakov, AS Shcheglova, LM Solomin, AN Vlasov, NN Zotkin, SA Bokel, C Botje, M Brummer, N Engelen, J Grijpink, S Koffeman, E Kooijman, P Schagen, S van Sighem, A Tiecke, H Tuning, N Velthuis, JJ Vossebeld, J Wiggers, L de Wolf, E Acosta, D Bylsma, B Durkin, LS Gilmore, J Ginsburg, CM Kim, CL Ling, TY Boogert, S Cooper-Sarkar, AM Devenish, RCE Grosse-Knetter, J Matsushita, T Ruske, O Sutton, MR Walczak, R Bertolin, A Brugnera, R Carlin, R Dal Corso, F Dosselli, U Dusini, S Limentani, S Morandin, M Posocco, M Stanco, LL Stroili, R Voci, C Iannotti, L Oh, BY Okrasinski, JR Toothacker, WS Whitmore, JJ Iga, Y D'Agostini, G Marini, G Nigro, A Cormack, C Hart, JC McCubbin, NA Shah, TP Epperson, D Heusch, C Sadrozinski, HFW Seiden, A Wichmann, R Williams, DC Pavel, N Abramowicz, H Dagan, S Kananov, S Kreisel, A Levy, A Abe, T Fusayasu, T Umemori, K Yamashita, T Hamatsu, R Hirose, T Inuzuka, M Kitamura, S Nishimura, T Arneodo, M Cartiglia, N Cirio, R Costa, M Ferrero, MI Maselli, S Monaco, V Peroni, C Ruspa, M Solano, A Staiano, A Dardo, M Bailey, DC Fagerstroem, CP Galea, R Koop, T Levman, GM Martin, JE Orr, RS Polenz, S Sabetfakhri, A Simmons, D Butterworth, JM Catterall, CD Hayes, ME Heaphy, EA Jones, TW Lane, JB West, BJ Ciborowski, J Ciesielski, R Grzelak, G Nowak, RJ Pawlak, JM Pawlak, R Smalska, B Tymieniecka, T Wroblewski, AK Zakrzewski, JA Zarnecki, AF Adamus, M Gadaj, T Deppe, O Eisenberg, K Hochman, D Karshon, U Badgett, WF Chapin, D Cross, R Foudas, C Mattingly, S Reeder, DD Smith, WH Vaiciulis, A Wildschek, T Wodarczyk, M Deshpande, A Dhawan, S Hughes, VW Bhadra, S Catterall, C Cole, JE Frisken, WR Hall-Wilton, R Khakzad, M Menary, S Schmidke, WB AF Breitweg, J Chekanov, S Derrick, M Krakauer, D Magill, S Musgrave, B Pellegrino, A Repond, J Stanek, R Yoshida, R Mattingly, MCK Abbiendi, G Anselmo, F Antonioli, P Bari, G Basile, M Bellagamba, L Boscherini, D Bruni, A Bruni, G Romeo, GC Castellini, G Cifarelli, L Cindolo, F Contin, A Coppola, N Corradi, M De Pasquale, S Giusti, P Iacobucci, G Laurenti, G Levi, G Margotti, A Massam, T Nania, R Palmonari, F Pesci, A Polini, A Sartorelli, G Garcia, YZ Zichichi, A Amelung, C Bornheim, A Brock, I Coboken, K Crittenden, J Deffner, R Hartmann, K Heinloth, K Hilger, E Irrgang, P Jakob, HP Kappes, A Katz, UF Kerger, R Paul, E Schnurbusch, H Stifutkin, A Tandler, J Voss, KC Weber, A Wieber, H Bailey, DS Barret, O Brook, NH Foster, B Heath, GP Heath, HF McFall, JD Piccioni, D Rodrigues, E Scott, J Tapper, RJ Capua, M Mastroberardino, A Schioppa, M Susinno, G Jeoung, HY Kim, JY Lee, JH Lim, IT Ma, KJ Pac, MY Caldwell, A Liu, W Liu, X Mellado, B Paganis, S Sacchi, R Sampson, S Sciulli, F Chwastowski, J Eskreys, A Figiel, J Klimek, K Olkiewicz, K Piotrzkowski, K Przybycien, MB Stopa, P Zawiejski, L Adamczyk, L Bednarek, B Jelen, K Kisielewska, D Kowal, AM Kowalski, T Przybycien, M Rulikowska-Zarebska, E Suszycki, L Szuba, D Kotanski, A Bauerdick, LAT Behrens, U Bienlein, JK Burgard, C Desler, K Drews, G Fox-Murphy, A Fricke, U Goebel, F Gottlicher, P Graciani, R Haas, T Hain, W Hartner, GF Hasell, D Hebbel, K Johnson, KF Kasemann, M Koch, W Kotz, U Kowalski, H Lindemann, L Lohr, B Martinez, M Milite, M Monteiro, T Moritz, M Notz, D Pelucchi, F Petrucci, MC Rohde, M Saull, PRB Savin, AA Schneekloth, U Selonke, F Sievers, M Stonjek, S Tassi, E Wolf, G Wollmer, U Youngman, C Zeuner, W Coldewey, C Grabosch, HJ Viani, ALD Meyer, A Schlenstedt, S Straub, PB Barbagli, C Gallo, E Pelfer, P Maccarrone, C Votano, L Bamberger, A Benen, A Eisenhardt, S Markun, P Raach, H Wolfle, S Bussey, PJ Doyle, AT Lee, SW Macdonald, N McCance, GJ Saxon, DH Sinclair, LE Skillicorn, IO Waugh, R Bohnet, I Gendner, N Holm, U Meyer-Larsen, A Salehi, H Wick, K Dannheim, D Garfagnini, A Gialas, I Gladilin, LK Kcira, D Klanner, R Lohrmann, E Poelz, G Zetsche, F Goncalo, R Long, KR Miller, DB Tapper, AD Walker, R Mallik, U Cloth, P Filges, D Ishii, T Kuze, M Nagano, K Tokushuku, K Yamada, S Yamazaki, Y Ahn, SH Lee, SB Park, SK Lim, H Park, IH Son, D Barreiro, F Garcia, G Glasman, C Gonzalez, O Labarga, L del Peso, J Redondo, I Terron, J Barbi, M Corriveau, F Hanna, DS Ochs, A Padhi, S Riveline, M Stairs, DG Wing, M Tsurugai, T Bashkirov, V Dologshein, BA Dementiev, RK Ermolov, PF Golubkov, YA Katkov, II Khein, LA Korotkova, NA Korzhavina, IA Kuzmin, VA Lukina, OY Proskuryakov, AS Shcheglova, LM Solomin, AN Vlasov, NN Zotkin, SA Bokel, C Botje, M Brummer, N Engelen, J Grijpink, S Koffeman, E Kooijman, P Schagen, S van Sighem, A Tiecke, H Tuning, N Velthuis, JJ Vossebeld, J Wiggers, L de Wolf, E Acosta, D Bylsma, B Durkin, LS Gilmore, J Ginsburg, CM Kim, CL Ling, TY Boogert, S Cooper-Sarkar, AM Devenish, RCE Grosse-Knetter, J Matsushita, T Ruske, O Sutton, MR Walczak, R Bertolin, A Brugnera, R Carlin, R Dal Corso, F Dosselli, U Dusini, S Limentani, S Morandin, M Posocco, M Stanco, LL Stroili, R Voci, C Iannotti, L Oh, BY Okrasinski, JR Toothacker, WS Whitmore, JJ Iga, Y D'Agostini, G Marini, G Nigro, A Cormack, C Hart, JC McCubbin, NA Shah, TP Epperson, D Heusch, C Sadrozinski, HFW Seiden, A Wichmann, R Williams, DC Pavel, N Abramowicz, H Dagan, S Kananov, S Kreisel, A Levy, A Abe, T Fusayasu, T Umemori, K Yamashita, T Hamatsu, R Hirose, T Inuzuka, M Kitamura, S Nishimura, T Arneodo, M Cartiglia, N Cirio, R Costa, M Ferrero, MI Maselli, S Monaco, V Peroni, C Ruspa, M Solano, A Staiano, A Dardo, M Bailey, DC Fagerstroem, CP Galea, R Koop, T Levman, GM Martin, JE Orr, RS Polenz, S Sabetfakhri, A Simmons, D Butterworth, JM Catterall, CD Hayes, ME Heaphy, EA Jones, TW Lane, JB West, BJ Ciborowski, J Ciesielski, R Grzelak, G Nowak, RJ Pawlak, JM Pawlak, R Smalska, B Tymieniecka, T Wroblewski, AK Zakrzewski, JA Zarnecki, AF Adamus, M Gadaj, T Deppe, O Eisenberg, K Hochman, D Karshon, U Badgett, WF Chapin, D Cross, R Foudas, C Mattingly, S Reeder, DD Smith, WH Vaiciulis, A Wildschek, T Wodarczyk, M Deshpande, A Dhawan, S Hughes, VW Bhadra, S Catterall, C Cole, JE Frisken, WR Hall-Wilton, R Khakzad, M Menary, S Schmidke, WB CA ZEUS Collaboration TI Search for resonances decaying to e(+)-jet in e(+)p interactions at HERA SO EUROPEAN PHYSICAL JOURNAL C LA English DT Article ID LEPTOQUARK PAIR PRODUCTION; MONTE-CARLO GENERATOR; P(P)OVER-BAR COLLISIONS; HADRON-COLLISIONS; SCATTERING; PHYSICS; MODEL; LEP AB The e(+)-jet invariant mass spectrum produced in the reaction e(+)p --> e(+)X has been studied at a center-of-mass energy of 300 GeV. The data were collected. using the ZEUS detector operating at the HERA collider, and correspond to an integrated luminosity of 47.7 pb(-1). The observed mass spectrum is in good agreement with Standard Model expectations up to an e(+)-jet mass of 210 GeV. Above this mass. some excess is seen. The angular distribution of these events is typical of high-Q(2) neutral current events and does not give convincing evidence for the presence of a narrow scalar or vector state. Limits are presented on the product of cross section and branching ratio for such a slate and are interpreted as limits on leptoquark or R-parity-violating squark production. Specific leptoquark types are ruled out at 95% confidence level for coupling strength lambda = 0.3 for masses between 150 and 280 GeV. C1 Argonne Natl Lab, Argonne, IL 60439 USA. Andrews Univ, Berrien Springs, MI 49104 USA. Univ Bologna, Bologna, Italy. Ist Nazl Fis Nucl, I-40126 Bologna, Italy. Univ Bonn, Inst Phys, D-5300 Bonn, Germany. Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England. Univ Calabria, Dept Phys, Ist Nazl Fis Nucl, I-87036 Cosenza, Italy. Chonnam Natl Univ, Kwangju 500757, South Korea. Columbia Univ, Nevis Labs, Irvington, NY USA. Inst Nucl Phys, Krakow, Poland. Acad Min & Met, Fac Phys & Nucl Tech, Krakow, Poland. Jagiellonian Univ, Dept Phys, Krakow, Poland. DESY, D-2000 Hamburg, Germany. DESY, Zeuthen, Germany. Univ Florence, Florence, Italy. Ist Nazl Fis Nucl, I-50125 Florence, Italy. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Freiburg, Fak Phys, D-7800 Freiburg, Germany. Univ Glasgow, Dept Phys & Astron, Glasgow, Lanark, Scotland. Univ Hamburg, Inst Expt Phys 1, Hamburg, Germany. Univ Hamburg, Inst Expt Phys 2, D-2000 Hamburg, Germany. Univ London Imperial Coll Sci Technol & Med, High Energy Nucl Phys Grp, London, England. Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA. KFA Julich, Forschungszentrum, Inst Kernphys, D-5170 Julich, Germany. Natl Lab High Energy Phys, KEK, Inst Particle & Nucl Studies, Tsukuba, Ibaraki 305, Japan. Korea Univ, Seoul 136701, South Korea. Kyungpook Natl Univ, Taegu 702701, South Korea. Univ Autonoma Madrid, Dept Fis Teor, Madrid, Spain. McGill Univ, Dept Phys, Montreal, PQ, Canada. Meiji Gakuin Univ, Fac Gen Educ, Yokohama, Kanagawa, Japan. Moscow Phys Engn Inst, Moscow, Russia. Moscow MV Lomonosov State Univ, Inst Phys Nucl, Moscow, Russia. NIKHEF H, NL-1009 DB Amsterdam, Netherlands. Univ Amsterdam, NL-1009 DB Amsterdam, Netherlands. Ohio State Univ, Dept Phys, Columbus, OH 43210 USA. Univ Oxford, Dept Phys, Oxford, England. Univ Padua, Dipartimento Fis, Padua, Italy. Ist Nazl Fis Nucl, Padua, Italy. Penn State Univ, Dept Phys, University Pk, PA 16802 USA. Polytech Univ, Sagamihara, Kanagawa, Japan. Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy. Ist Nazl Fis Nucl, Rome, Italy. Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England. Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA. Univ Siegen, Fachbereich Phys, D-57068 Siegen, Germany. Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Phys, IL-69978 Tel Aviv, Israel. Univ Tokyo, Dept Phys, Tokyo 113, Japan. Tokyo Metropolitan Univ, Dept Phys, Tokyo, Japan. Univ Turin, Dipartimento Fis Sperimentale, Turin, Italy. Ist Nazl Fis Nucl, I-10125 Turin, Italy. Ist Nazl Fis Nucl, Alessandria, Italy. Univ Turin, Fac Sci 2, Alessandria, Italy. Univ Toronto, Dept Phys, Toronto, ON, Canada. UCL, Dept Phys & Astron, London, England. Warsaw Univ, Inst Expt Phys, Warsaw, Poland. Inst Nucl Studies, Argonne, IL USA. Weizmann Inst Sci, Dept Particle Phys, IL-76100 Rehovot, Israel. Univ Wisconsin, Dept Phys, Madison, WI 53706 USA. Yale Univ, Dept Phys, New Haven, CT USA. York Univ, Dept Phys, Toronto, ON M3J 2R7, Canada. IROE Florence, Florence, Italy. Univ Hamburg, Hamburg, Germany. Univ Tokyo, Tokyo, Japan. RP Breitweg, J (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Morandin, Mauro/A-3308-2016; De Pasquale, Salvatore/B-9165-2008; Wing, Matthew/C-2169-2008; Bashkirov, Vladimir/A-4818-2008; Doyle, Anthony/C-5889-2009; Golubkov, Yury/E-1643-2012; Proskuryakov, Alexander/J-6166-2012; Dementiev, Roman/K-7201-2012; Katz, Uli/E-1925-2013; Wiggers, Leo/B-5218-2015; Tassi, Enrico/K-3958-2015; Gladilin, Leonid/B-5226-2011; Solomin, Anatoly/C-3072-2016; dusini, stefano/J-3686-2012; Goncalo, Ricardo/M-3153-2016; Graciani Diaz, Ricardo/I-5152-2016; Capua, Marcella/A-8549-2015; OI Morandin, Mauro/0000-0003-4708-4240; De Pasquale, Salvatore/0000-0001-9236-0748; Doyle, Anthony/0000-0001-6322-6195; Katz, Uli/0000-0002-7063-4418; Wiggers, Leo/0000-0003-1060-0520; Gladilin, Leonid/0000-0001-9422-8636; dusini, stefano/0000-0002-1128-0664; Goncalo, Ricardo/0000-0002-3826-3442; Graciani Diaz, Ricardo/0000-0001-7166-5198; Bailey, David C/0000-0002-7970-7839; Kasemann, Matthias/0000-0002-0429-2448; Castellini, Guido/0000-0002-0177-0643; Capua, Marcella/0000-0002-2443-6525; Arneodo, Michele/0000-0002-7790-7132; Abbiendi, Giovanni/0000-0003-4499-7562 NR 37 TC 33 Z9 33 U1 0 U2 1 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1434-6044 J9 EUR PHYS J C JI Eur. Phys. J. C PD AUG PY 2000 VL 16 IS 2 BP 253 EP 267 DI 10.1007/s100520050018 PG 15 WC Physics, Particles & Fields SC Physics GA 352ER UT WOS:000089202000004 ER PT J AU Feldman, DE Lyuksyutov, IF Pokrovsky, VL Vinokur, VM AF Feldman, DE Lyuksyutov, IF Pokrovsky, VL Vinokur, VM TI Vortex plasma and transport in superconducting films with magnetic dots (vol 51, pg 110, 2000) SO EUROPHYSICS LETTERS LA English DT Correction C1 Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA. LD Landau Theoret Phys Inst, Chernogolovka 142432, Moscow Region, Russia. Weizmann Inst Sci, Condensed Matter Phys Dept, IL-76100 Rehovot, Israel. Ukrainian Acad Sci, Inst Phys, UA-252028 Kiev, Ukraine. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Feldman, DE (reprint author), Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA. NR 1 TC 1 Z9 1 U1 0 U2 0 PU E D P SCIENCES PI LES ULIS CEDEXA PA 7, AVE DU HOGGAR, PARC D ACTIVITES COURTABOEUF, BP 112, F-91944 LES ULIS CEDEXA, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD AUG PY 2000 VL 51 IS 4 BP 476 EP 476 DI 10.1209/epl/i2000-00519-4 PG 1 WC Physics, Multidisciplinary SC Physics GA 348BC UT WOS:000088963300018 ER PT J AU Engelbracht, CW Young, ET Rieke, GH Rivlis, G Beeman, JW Haller, EE AF Engelbracht, CW Young, ET Rieke, GH Rivlis, G Beeman, JW Haller, EE TI Observing and calibration strategies for FIR imaging with SIRTF SO EXPERIMENTAL ASTRONOMY LA English DT Article; Proceedings Paper CT ISO Detector Workshop CY JAN 14-18, 1998 CL MADRID, SPAIN SP ISO Sci Operat Ctr DE FIR detectors; MIPS; SIRTF; space instrumentation AB We present data from a 16x32 array of unstressed Ge:Ga detectors, showing the long time constant responses and hook effect characteristic of these devices. This array is half the size of the 70 mu m imaging array planned for MIPS, the Multiband Imaging Photometer for SIRTE We present simulations of the FIR (far infrared) sky as viewed by a MIPS array, including realistic noise effects and extraction of point sources with a standard photometry package, showing that the photometric goals of MIPS are attainable with the current array performance and using standard analysis techniques. Previous calculations by Helm et al. (1998) had determined that MIPS would achieve 5-sigma detections of less than or equal to 1 mJy at 70 mu m in 2000 s; the simulations presented here obtain results consistent with those calculations. C1 Univ Arizona, Steward Observ, Tucson, AZ 85721 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Mat Sci & Mineral Engn, Berkeley, CA 94720 USA. RP Engelbracht, CW (reprint author), Univ Arizona, Steward Observ, Tucson, AZ 85721 USA. NR 6 TC 2 Z9 2 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0922-6435 J9 EXP ASTRON JI Exp. Astron. PD AUG PY 2000 VL 10 IS 2-3 BP 403 EP 413 DI 10.1023/A:1008027931585 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 362TW UT WOS:000089795200019 ER PT J AU Dauble, DD Mueller, RP AF Dauble, DD Mueller, RP TI Difficulties in estimating survival for adult chinook salmon in the Columbia and Snake rivers SO FISHERIES LA English DT Article ID ONCORHYNCHUS-TSHAWYTSCHA AB We reviewed current methods used to estimate survival of adult chinook salmon (Oncorhynchus tshawytscha) as they migrate upstream past hydroelectric projects in the Columbia and Snake rivers, evaluated known and unaccounted-for loss factors, and assessed how adult survival estimates could be improved. Dam counts and associated passage conversion rates do not always provide accurate estimates of adult survival between hydroelectric projects. Expansion techniques for reconstructing run size and harvest rates also contribute to variability in estimates of run size and potential loss between hydroelectric projects. Use of passage conversion rates to estimate in-river survival of adult spring chinook salmon had less uncertainty than for estimates of other runs. Fixed-run cui off dates for migration timing result in a high uncertainty for monitoring relative numbers of summer chinook salmon. We also found it difficult to reconstruct run size to spawning areas or to estimate interdam survival for fall chinook in lower Snake River darns because of straying and high incidence (e.g., up to 40% at some projects) of fallback behavior. In-river survival estimates of adult chinook salmon would be improved by factoring adult fallback percentages into passage estimates, combining spring and summer runs for accounting purposes, methods. C1 Pacific NW Lab, Environm Technol Div, Richland, WA 99352 USA. RP Dauble, DD (reprint author), Pacific NW Lab, Environm Technol Div, POB 999, Richland, WA 99352 USA. NR 54 TC 23 Z9 24 U1 1 U2 5 PU AMER FISHERIES SOC PI BETHESDA PA 5410 GROSVENOR LANE SUITE 110, BETHESDA, MD 20814-2199 USA SN 0363-2415 J9 FISHERIES JI Fisheries PD AUG PY 2000 VL 25 IS 8 BP 24 EP 34 DI 10.1577/1548-8446(2000)025<0024:UPMDIE>2.0.CO;2 PG 11 WC Fisheries SC Fisheries GA 338PL UT WOS:000088428400004 ER PT J AU Hu, WZ Haddad, PR Hasebe, K Cook, HA Fritz, JS AF Hu, WZ Haddad, PR Hasebe, K Cook, HA Fritz, JS TI Analysis of inorganic anions by electrostatic ion chromatography using zwitterionic/cationic mixed micelles as the stationary phase SO FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY LA English DT Article ID SEPARATION AB The inability to separate fluoride, phosphate and sulfate by electrostatic ion chromatography (EIC) was overcome by using: an ODS silica column coated with mixed zwitterionic-cationic surfactants as the stationary phase. The best results were obtained using the zwitterionic surfactant, 3-(N,N -dimethylmyristylammonium)-propanesulfonate (C19H41NO3S), and the cationic surfactant, myristyltrimethylammonium, CH3(CH2)(13)N+(CH3)(3), in a 10:1 molar ratio in the column coating solution. With a dilute solution of sodium tetraborate as the eluent the model analyte anions were completely separated in the following elution order: F-, HPO42-, SO42-, Cl-, NO2-, Br-, NO3-. The very early elution of phosphate and sulfate is most unusual and is unique to this system. Detection limits bet ter than 1.1 x 10(-4) mM and linear calibration plots up to 7.0 mM were obtained with a suppressed conductivity system. C1 Hokkaido Univ, Grad Sch Sci, Div Chem, Sapporo, Hokkaido 0600810, Japan. Univ Tasmania, Sch Chem, Hobart, Tas 7001, Australia. Iowa State Univ, Ames Lab, US DOE, Ames, IA USA. Iowa State Univ, Dept Chem, Ames, IA USA. RP Hu, WZ (reprint author), Hokkaido Univ, Grad Sch Sci, Div Chem, Sapporo, Hokkaido 0600810, Japan. NR 14 TC 5 Z9 5 U1 1 U2 1 PU SPRINGER-VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 0937-0633 J9 FRESEN J ANAL CHEM JI Fresenius J. Anal. Chem. PD AUG PY 2000 VL 367 IS 7 BP 641 EP 644 DI 10.1007/s002160000436 PG 4 WC Chemistry, Analytical SC Chemistry GA 339FZ UT WOS:000088468100006 PM 11221926 ER PT J AU Schissel, DP Peng, Q Schachter, J Terpstra, TB Casper, TA Freeman, J Jong, R Keith, KM McHarg, BB Meyer, WH Parker, CT AF Schissel, DP Peng, Q Schachter, J Terpstra, TB Casper, TA Freeman, J Jong, R Keith, KM McHarg, BB Meyer, WH Parker, CT TI Enhanced computational infrastructure for data analysis at the DIII-D National Fusion Facility SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2nd IAEA Technical Committee Meeting on Control Data Acquisition and Remote Participation on Fusion Research CY JUL 19-21, 1999 CL LISBON, PORTUGAL SP Int Atom Energy Agcy, Tech Comm, Inst Super Tenico DE infrastructure; data analysis; DIII-D AB Recently a number of enhancements to the computer hardware infrastructure have been implemented at the DIII-D National Fusion Facility. Utilizing these improvements to the hardware infrastructure, software enhancements are focusing on streamlined analysis, automation, and graphical user interface (GUI) systems to enlarge the user base. The adoption of the load balancing software package LSF Suite by Platform Computing has dramatically increased the availability of CPU cycles and the efficiency of their use. Streamlined analysis has been aided by the adoption of the MDSplus system to provide a unified interface to analyzed DIII-D data. The majority of MDSplus data is made available in between pulses giving the researcher critical information before setting up the next pulse. Work on data viewing and analysis tools focuses on efficient GUI design with object-oriented programming (OOP) for maximum code flexibility. Work to enhance the computational infrastructure at DIII-D hats included a significant effort to aid the remote collaborator since the DIII-D National Team consists of scientists from nine national laboratories, 19 foreign laboratories, 16 universities, and five industrial partnerships. As a result of this work, DIII-D data is available on a 24 x 7 basis from a set of viewing and analysis tools that can be run on either the collaborators' or DIII-D's computer systems. Additionally, a web based data and code documentation system has been created to aid the novice and expert user alike. (C) 2000 Elsevier Science S.A. All rights reserved. C1 Gen Atom Co, San Diego, CA 92186 USA. Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA USA. RP Schissel, DP (reprint author), Gen Atom Co, POB 85608, San Diego, CA 92186 USA. NR 6 TC 2 Z9 2 U1 1 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD AUG PY 2000 VL 48 IS 1-2 BP 105 EP 111 DI 10.1016/S0920-3796(00)00141-1 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 356WB UT WOS:000089464900016 ER PT J AU Casper, TA Jong, RA Meyer, WH Moller, JM AF Casper, TA Jong, RA Meyer, WH Moller, JM TI Support and development for remote collaborations in fusion research SO FUSION ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2nd IAEA Technical Committee Meeting on Control Data Acquisition and Remote Participation on Fusion Research CY JUL 19-21, 1999 CL LISBON, PORTUGAL SP Int Atom Energy Agcy, Tech Comm, Inst Super Tenico DE common object request broker architecture; network; transport code; communication systems; virtual laboratories AB Major fusion experiments and modeling efforts rely on joint research of scientists from several locations around the world. A variety of software tools are in use to provide remote interactive access to facilities and data are routinely available over wide-area-network connections to researchers. Audio and video communications, monitoring of control room information and synchronization of remote sites with experimental operations all enhance participation during experiments. Remote distributed computing capabilities allow utilization of off-site computers that now help support the demands of control room analyses and plasma modeling. A collaborative software development project is currently using object technologies with CORBA-based communications to build a network executable transport code that further demonstrates the ability to utilize geographically dispersed resources. Development to extend these concepts with security and naming services and possible applications to instrumentation systems has been initiated. An Information Technology Initiative is deploying communication systems, ISDN (telephone) and IP (network) audio/video (A/V) and web browser-based, to build the infrastructure needed to support remote physics meetings, seminars and interactive discussions. (C) 2000 Elsevier Science S.A. All rights reserved. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Casper, TA (reprint author), Univ Calif Lawrence Livermore Natl Lab, 7000 E Ave,POB 808 L637, Livermore, CA 94550 USA. NR 11 TC 2 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD AUG PY 2000 VL 48 IS 1-2 BP 231 EP 237 DI 10.1016/S0920-3796(00)00136-8 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 356WB UT WOS:000089464900034 ER PT J AU Kim, J Noskov, VN Li, XC Bergmann, A Ren, XJ Warth, T Richardson, P Kouprina, N Stubbs, L AF Kim, J Noskov, VN Li, XC Bergmann, A Ren, XJ Warth, T Richardson, P Kouprina, N Stubbs, L TI Discovery of a novel, paternally expressed ubiquitin-specific processing protease gene through comparative analysis of an imprinted region of mouse chromosome 7 and human chromosome 19q13.4 SO GENOME RESEARCH LA English DT Article ID BECKWITH-WIEDEMANN-SYNDROME; ZINC-FINGER PROTEIN; PROXIMAL CHROMOSOME-7; EVOLUTIONARY CHANGES; MATERNAL-BEHAVIOR; PRADER-WILLI; TRANSCRIPTS; PEG3; AMPLIFICATION; MUTATIONS AB Using mouse BAC clones spanning an imprinted interval of proximal mouse chromosome 7 and the genomic sequence of the related interval of human chromosome 19q13.4, we have identified a novel mouse gene, Usp29 (ubiquitin-specific processing protease 29), near two known imprinted genes, Peg3 and Ziml. Gene Usp29 is located directly adjacent to Peg3 in a "head-to-head" orientation, and comprises exons distributed over a genomic distance of at least 400 kb. A similar human gene is also Found in the homologous location in human chromosome 19q13.4. The mouse Usp29 gene is also imprinted and is transcribed mainly from the paternal allele with highest expression levels in adult brain, especially in the cerebral cortex and hippocampus, and in the Forebrain, face, and limb buds of midgestation mouse embryos. Analysis of a full-length 7.6-kb cDNA clone revealed that Usp29 encodes an 869-amino-acid protein that displays significant homology with yeast and nematode ubiquitin carboxyl-terminal hydrolases. These data suggest that, like the candidate Angelman syndrome gene Ube3a (ubiquitin ligase), Usp29 may represent another imprinted gene involved in the ubiquitination pathway. This identification of a third imprinted gene, Usp29, From the Peg3/Ziml-region confirms the presence of a conserved imprinted domain spanning at least 500 kb in the proximal portion of mouse chromosome 7 (Mmu7). C1 Univ Calif Lawrence Livermore Natl Lab, Ctr Human Genome, Biol & Biotechnol Res Program, Livermore, CA 94551 USA. DOE Joint Genome Inst, Walnut Creek, CA 94598 USA. NIEHS, Mol Genet Lab, Res Triangle Pk, NC 27709 USA. RP Stubbs, L (reprint author), Univ Calif Lawrence Livermore Natl Lab, Ctr Human Genome, Biol & Biotechnol Res Program, L-441, Livermore, CA 94551 USA. OI Stubbs, Lisa/0000-0002-9556-1972 NR 39 TC 51 Z9 56 U1 0 U2 2 PU COLD SPRING HARBOR LAB PRESS PI PLAINVIEW PA 1 BUNGTOWN RD, PLAINVIEW, NY 11724 USA SN 1088-9051 J9 GENOME RES JI Genome Res. PD AUG PY 2000 VL 10 IS 8 BP 1138 EP 1147 DI 10.1101/gr.10.8.1138 PG 10 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Genetics & Heredity SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Genetics & Heredity GA 347ZC UT WOS:000088958200010 PM 10958632 ER PT J AU Bargar, JR Reitmeyer, R Lenhart, JJ Davis, JA AF Bargar, JR Reitmeyer, R Lenhart, JJ Davis, JA TI Characterization of U(VI)-carbonato ternary complexes on hematite: EXAFS and electrophoretic mobility measurements SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID OXIDE-WATER INTERFACES; BOND-VALENCE DETERMINATION; PB(II) SORPTION PRODUCTS; SURFACE COMPLEXATION; URANIUM(VI) ADSORPTION; MOLECULAR-STRUCTURE; AQUEOUS-SOLUTION; ION ADSORPTION; URANYL-ION; XAFS AB We have measured U(VI) adsorption on hematite using EXAFS spectroscopy and electrophoresis under conditions relevant to surface waters and aquifers (0.01 to 10 mu M dissolved uranium concentrations, in equilibrium with air, pH 4.5 to 8.5). Both techniques suggest the existence of anionic U(VI)-carbonato ternary complexes. Fits to EXAFS spectra indicate that U(VI) is simultaneously coordinated to surface FeO6 octahedra and carbonate (or bicarbonate) ligands in bidentate fashions, leading to the conclusion that the ternary complexes have an inner-sphere metal bridging (hematite-U(VI)-carbonato) structure. Greater than or equal to 50% of adsorbed U(VI) was comprised of monomeric hematite-U(VI)-carbonato ternary complexes, even at pH 4.5. Multimeric U(VI) species were observed at pH greater than or equal to 6.5 and aqueous U(VI) concentrations approximately an order of magnitude more dilute than the solubility of crystalline beta-UO2(OH)(2). Based on structural constraints, these complexes were interpreted as dimeric hematite-U(VI)-carbonato ternary complexes. These results suggest that Fe-oxide U(VI)-carbonato complexes are likely to be important transporting-limiting species in oxic aquifers throughout a wide range of pH values. Copyright (C) 2000 Elsevier Science Ltd. C1 Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. US Geol Survey, Div Water Resources, Menlo Pk, CA 94025 USA. RP Bargar, JR (reprint author), Stanford Synchrotron Radiat Lab, POB 4349, Stanford, CA 94309 USA. EM bargar@slac.stanford.edu NR 43 TC 215 Z9 218 U1 9 U2 81 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0016-7037 EI 1872-9533 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD AUG PY 2000 VL 64 IS 16 BP 2737 EP 2749 DI 10.1016/S0016-7037(00)00398-7 PG 13 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 345JU UT WOS:000088813500002 ER PT J AU Bargar, JR Tebo, BM Villinski, JE AF Bargar, JR Tebo, BM Villinski, JE TI In situ characterization of Mn(II) oxidation by spores of the marine Bacillus sp strain SG-1 SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID MANGANESE(II) OXIDATION; MINERAL FORMATION; INSIGHTS; CLUSTER; GROWTH; OXIDES; EXAFS AB Microbial oxidation of Mn(II) and subsequent precipitation of insoluble, reactive Mn(IV) oxides are primary sources of these solid phases in the environment and key controls on Mn cycling in natural waters. We have performed in situ x-ray absorption near-edge structure (XANES) spectroscopic measurements of Mn(II) oxidation by spores of the marine Bacillus sp. strain SG I to characterize the intermediates and products of the oxidation reactions. Mn(IV)-oxides resembling delta-MnO(2) were observed to form at a rapid rate (within 14 min of reaction onset). Mn(III) intermediates did not occur above detection limit (5 to 10% of total Mn), even though Mn(III)/(II,III) oxides (MnOOH or Mn(3)O(4)) should have been more stable than MnO(2) under the conditions of the experiments. These results suggest that Mn(IV) is the primary product of bacterial Mn(II) oxidation by Bacillus strain SG-1. Given that SG-1 is a good model for Mn(II)-oxidizing bacteria, these findings help to explain the predominance of Mn(IV)-oxides in aquatic environments. Copyright (C) 2000 Elsevier Science Ltd. C1 Stanford Linear Accelerator Ctr, Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. Univ Calif San Diego, Scripps Inst Oceanog, Div Marine Biol Res, La Jolla, CA 92093 USA. Univ Arizona, Dept Hydrol & Water Resources, Tucson, AZ 85721 USA. RP Bargar, JR (reprint author), Stanford Linear Accelerator Ctr, Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. EM bargar@slac.stanford.edu RI Tebo, Bradley/A-8432-2017 OI Tebo, Bradley/0000-0002-6301-4325 NR 22 TC 90 Z9 95 U1 2 U2 30 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD AUG PY 2000 VL 64 IS 16 BP 2775 EP 2778 DI 10.1016/S0016-7037(00)00368-9 PG 4 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 345JU UT WOS:000088813500005 ER PT J AU McCaig, AM Wayne, DM Rosenbaum, JM AF McCaig, AM Wayne, DM Rosenbaum, JM TI Fluid expulsion and dilatancy pumping during thrusting in the Pyrenees: Pb and Sr isotope evidence SO GEOLOGICAL SOCIETY OF AMERICA BULLETIN LA English DT Article DE faults; fluid inclusions; fluids; isotopes; Pyrenees; vein systems ID ACCRETIONARY PRISM; METAMORPHIC ROCKS; FORELAND BASIN; SWISS-ALPS; U-PB; FAULTS; FLOW; CONSTRAINTS; NAPPE; SYSTEMATICS AB Pb and Sr isotope data have been collected from fluid inclusions trapped in syntectonic quartz veins associated with the Gavarnie thrust in the central Pyrenees, and from lithologies in the footwall and hanging wall of the thrust. These data suggest the occurrence of three distinct phases of fluid movement related to different periods in the structural evolution of the thrust zone. During the first phase, fluid interacting with the Silurian graphitic slates in the immediate hanging wall of the Gavarnie thrust moved along a carbonate mylonite zone beneath the thrust, enriching the deforming carbonates in Sr-87 and Pb-207. The second phase of fluid movement occurred during imbricate thrusting and intense veining beneath the Gavarnie thrust. Isotope data from quartz-hosted fluid inclusions show a trend toward high Pb-208/Pb-204 ratios With increasing (PP)-P-207/Pb-204 and Pb-206/Pb-204 and decreasing Sr-87/Sr-86. The inclusions contain fluids equilibrated with several source lithologies: deformed Cretaceous and Silurian rocks within the thrust zone, Devonian phyllites located above the Silurian slates in the thrust hanging wall, and Triassic redbeds located beneath Cretaceous limestones in the thrust footwall. The mixture of fluids reflects both the transient chemical interaction of previously isolated rock types in the footwall and hanging wall via fault and fracture networks, and dilatancy pumping of fluid into opening veins. The Last phase of fluid movement resulted in the precipitation of late carbonate vein fills and a return to more local fluid movement as stresses relaxed and fracture networks healed. Overpressured fluids trapped within and partially expelled from the thrust zone during phase 1 were still present during phases 2 and 3. This suggests that average permeabilities within the mylonites mere low and that transient high-permeability zones related to fracture networks were of limited extent. C1 Univ Leeds, Sch Earth Sci, Leeds LS2 9JT, W Yorkshire, England. Univ Calif Los Alamos Natl Lab, Nucl Mat & Technol Div, Los Alamos, NM 87545 USA. Univ Reading, Postgrad Res Inst Sedimentol, Reading RG6 6AB, Berks, England. RP McCaig, AM (reprint author), Univ Leeds, Sch Earth Sci, Leeds LS2 9JT, W Yorkshire, England. RI McCaig, Andrew/C-1066-2014 OI McCaig, Andrew/0000-0001-7416-4911 NR 47 TC 10 Z9 11 U1 1 U2 1 PU ASSOC ENGINEERING GEOLOGISTS GEOLOGICAL SOCIETY AMER PI COLLEGE STN PA TEXAS A & M UNIV, DEPT GEOLOGY & GEOPHYSICS, COLLEGE STN, TX 77843-3115 USA SN 0016-7606 J9 GEOL SOC AM BULL JI Geol. Soc. Am. Bull. PD AUG PY 2000 VL 112 IS 8 BP 1199 EP 1208 DI 10.1130/0016-7606(2000)112<1199:FEADPD>2.3.CO;2 PG 10 WC Geosciences, Multidisciplinary SC Geology GA 339FD UT WOS:000088466200003 ER PT J AU Marsella, KA Bierman, PR Davis, PT Caffee, MW AF Marsella, KA Bierman, PR Davis, PT Caffee, MW TI Cosmogenic Be-10 and Al-26 ages for the Last Glacial Maximum, eastern Baffin Island, Arctic Canada SO GEOLOGICAL SOCIETY OF AMERICA BULLETIN LA English DT Article DE Baffin Island; cosmogenic exposure dating; dating; deglaciation; Laurentide ice sheet; Last Glacial Maximum ID LAURENTIDE ICE-SHEET; SOUTHWESTERN CUMBERLAND PENINSULA; LATE QUATERNARY STRATIGRAPHY; NORTH-ATLANTIC SEDIMENTS; HEINRICH EVENTS; INNUITIAN ICE; ELLESMERE-ISLAND; SEA-LEVEL; DETRITAL CARBONATE; DEVON ISLAND AB A chronology for the Last Glacial Maximum based on cosmogenic exposure dating in the Pangnirtung Fjord area, eastern Baffin bland, Arctic Canada, is at adds with many decades of land-based, glacial stratigraphic research. Most previous chronologies focused primarily an relative weathering criteria and suggested that ice extent was restricted during the late Wisconsinan (ca. 24-8 ka). In contrast, by directly dating glacial features, we conclude that late Wisconsinan ice was far more extensive than previously believed. There are 36 gneissic boulders and 8 samples of ice-molded gneissic bedrock that yield late Wisconsinan Be-10 and Al-26 exposure ages for the last glaciation of Pangnirtung Fjord. The prominent Duval moraines, which were previously interpreted to represent a significant early Wisconsinan (100-60 ka) ice advance on southern Cumberland Peninsula, were actually deposited between 24 and 9 ka. Two boulders from a raised glaciomarine delta, stratigraphically related to the Duval moraines, date to about 10 ka. Two recessional moraines and striated bedrock along Pangnirtung Fjord, as well as erratics on the floor of the Kolik River valley, a tributary to Pangnirtung Fjord, indicate that deglaciation began between 12 and 9 ka. In situ produced Be-10 and Al-26 abundances indicate that ice filled Pangnirtung Fjord for about 15 k.y. (either continuously or intermittently) prior to 10 ka, which is compatible with C-14 chronologies for adjacent Cumberland Sound. Thus, our data support other recent studies that suggest the northern and southern margins of the Laurentide ice sheet were generally in phase during the latest Wisconsinan, contrary to earlier interpretations. C1 Univ Vermont, Dept Geol, Burlington, VT 05405 USA. Bentley Coll, Dept Nat Sci, Waltham, MA 02452 USA. Univ Calif Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94550 USA. RP Marsella, KA (reprint author), Skidmore Coll, Dept Geol, Saratoga Springs, NY 12866 USA. RI Caffee, Marc/K-7025-2015 OI Caffee, Marc/0000-0002-6846-8967 NR 97 TC 52 Z9 53 U1 0 U2 3 PU ASSOC ENGINEERING GEOLOGISTS GEOLOGICAL SOCIETY AMER PI COLLEGE STN PA TEXAS A & M UNIV, DEPT GEOLOGY & GEOPHYSICS, COLLEGE STN, TX 77843-3115 USA SN 0016-7606 J9 GEOL SOC AM BULL JI Geol. Soc. Am. Bull. PD AUG PY 2000 VL 112 IS 8 BP 1296 EP 1312 DI 10.1130/0016-7606(2000)112<1296:CBAAAF>2.3.CO;2 PG 17 WC Geosciences, Multidisciplinary SC Geology GA 339FD UT WOS:000088466200010 ER PT J AU Kaiser, DP AF Kaiser, DP TI Decreasing cloudiness over China: An updated analysis examining additional variables SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID MINIMUM TEMPERATURE; SUNSHINE; MAXIMUM; TRENDS AB Trends in Chinese total cloud amount, surface air pressure, surface water vapor pressure, and surface relative humidity were analyzed for the period 1954-1994. The data were obtained from a database of 6-hourly weather observations provided by the China Meteorological Administration. Seasonal and annual means of all four variables were computed for each of 196 stations and for China as a whole. Linear regression analysis was used to characterize seasonal and annual trends in these variables from 1954-1994, with the cloud amount record also extended through 1996 using a newly compiled global cloudiness database. Decreasing cloud amount trends are observed over much of China, as are increasing trends in surface air pressure. The spatial pattern of observed trends in water vapor pressure and relative humidity are more complex; a few scattered regions of China show increasing surface water vapor pressure, whereas surface relative humidity is found to increase in northwestern China and decrease in northeastern China (where the largest decreases in cloud amount are observed). The all-China time series of total cloud amount (surface air pressure) shows a remarkable drop-off (upswing) beginning in 1978. C1 Oak Ridge Natl Lab, Div Environm Sci, Carbon Dioxide Informat Anal Ctr, Oak Ridge, TN 37831 USA. RP Kaiser, DP (reprint author), Oak Ridge Natl Lab, Div Environm Sci, Carbon Dioxide Informat Anal Ctr, MS6335, Oak Ridge, TN 37831 USA. NR 12 TC 110 Z9 142 U1 1 U2 15 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD AUG 1 PY 2000 VL 27 IS 15 BP 2193 EP 2196 DI 10.1029/2000GL011358 PG 4 WC Geosciences, Multidisciplinary SC Geology GA 341JL UT WOS:000088587200006 ER PT J AU Williams, RS Norby, RJ Lincoln, DE AF Williams, RS Norby, RJ Lincoln, DE TI Effects of elevated CO(2) and temperature-grown red and sugar maple on gypsy moth performance SO GLOBAL CHANGE BIOLOGY LA English DT Article DE elevated CO(2) and temperature; global climate change; insect performance; leaf nitrogen; Lymantria dispar; phenolics ID ATMOSPHERIC CO2; INSECT PERFORMANCE; LOBLOLLY-PINE; DECIDUOUS TREES; CARBON-DIOXIDE; FOREST; RESPONSES; PHYTOCHEMISTRY; PRODUCTIVITY; ECOSYSTEMS AB Few studies have investigated how tree species grown under elevated CO(2) and elevated temperature alter the performance of leaf-feeding insects. The indirect effects of an elevated CO(2) concentration and temperature on leaf phytochemistry, along with potential direct effects on insect growth and consumption, may independently or interactively affect insects. To investigate this, we bagged larvae of the gypsy moth on leaves of red and sugar maple growing in open-top chambers in four CO(2)/temperature treatment combinations: (i) ambient temperature, ambient CO(2); (ii) ambient temperature, elevated CO(2) (+ 300 mu L L(-1) CO(2)); (iii) elevated temperature (+ 3.5 degrees C), ambient CO(2); and (iv) elevated temperature, elevated CO(2). For both tree species, leaves grown at elevated CO(2) concentration were significantly reduced in leaf nitrogen concentration and increased in C:N ratio, while neither temperature nor its interaction with CO(2) concentration had any effect. Depending on the tree species, leaf water content declined (red maple) and carbon-based phenolics increased (sugar maple) on plants grown in an enriched CO(2) atmosphere. The only observed effect of elevated temperature on leaf phytochemistry was a reduction in leaf water content of sugar maple leaves. Gypsy moth larval responses were dependent on tree species. Larvae feeding on elevated CO(2)-grown red maple leaves had reduced growth, while temperature had no effect on the growth or consumption of larvae. No significant effects of either temperature or CO(2) concentration were observed for larvae feeding on sugar maple leaves. Our data demonstrate strong effects of CO(2) enrichment on leaf phytochemical constituents important to folivorous insects, while an elevated temperature largely has little effect. We conclude that alterations in leaf chemistry due to an elevated CO(2) atmosphere are more important in this plant-folivorous insect system than either the direct short-term effects of temperature on insect performance or its indirect effects on leaf chemistry. C1 Appalachian State Univ, Dept Biol, Boone, NC 28608 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Univ S Carolina, Dept Biol Sci, Columbia, SC 29208 USA. RP Williams, RS (reprint author), Appalachian State Univ, Dept Biol, Boone, NC 28608 USA. EM willmsrs@appstate.edu RI Norby, Richard/C-1773-2012 OI Norby, Richard/0000-0002-0238-9828 NR 50 TC 46 Z9 54 U1 2 U2 19 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 1354-1013 J9 GLOBAL CHANGE BIOL JI Glob. Change Biol. PD AUG PY 2000 VL 6 IS 6 BP 685 EP 695 DI 10.1046/j.1365-2486.2000.00343.x PG 11 WC Biodiversity Conservation; Ecology; Environmental Sciences SC Biodiversity & Conservation; Environmental Sciences & Ecology GA 345GJ UT WOS:000088808000008 ER PT J AU Fisenne, IM AF Fisenne, IM TI Introduction of the Taylor lecturer - Naomi Ann Hallden SO HEALTH PHYSICS LA English DT Biographical-Item C1 US DOE, Environm Measurements Lab, New York, NY 10014 USA. NR 1 TC 0 Z9 0 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 AUG PY 2000 VL 79 IS 2 BP 119 EP 120 DI 10.1097/00004032-200008000-00003 PG 2 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 334PF UT WOS:000088194300001 PM 10910380 ER PT J AU Olsher, RH Hsu, HH Beverding, A Kleck, JH Casson, WH Vasilik, DG Devine, RT AF Olsher, RH Hsu, HH Beverding, A Kleck, JH Casson, WH Vasilik, DG Devine, RT TI WENDI: An improved neutron REM meter SO HEALTH PHYSICS LA English DT Article DE instruments; neutrons; Monte Carlo; survey meter ID COUNTER LINUS; RANGE; DESIGN AB Neutron rem meters are routinely used for real-time field measurements of neutron dose equivalent where neutron spectra are unknown or poorly characterized. These meters are designed so that their response per unit fluence approximates an appropriate fluence-to-dose conversion function, Typically, a polyethylene moderator assembly surrounds a thermal neutron detector, such as a BF, counter tube. Internal absorbers may also be used to further fine-tune the detector response to the shape of the desired fluence conversion function. Historical designs suffer from a number of limitations. Accuracy for some designs is poor at intermediate energies (50 keV-250 keV) critical for nuclear power plant dosimetry. The well-known Andersson-Braun design suffers from angular dependence because of its lack of spherical symmetry. Furthermore, all models using a pure polyethylene moderator have no useful high-energy response, which makes them inaccurate around high-energy accelerator facilities. This paper describes two new neutron rem meter designs with improved accuracy over the energy range from thermal to 5 GeV. The Wide Energy Neutron Detection Instrument (WENDI) makes use of both neutron generation and absorption to contour the detector response function. Tungsten or tungsten carbide (WC) powder is added to a polyethylene moderator with the expressed purpose of generating spallation neutrons in tungsten nuclei and thus enhance the high-energy response of the meter beyond 8 MeV. Tungsten's absorption resonance structure below several keV was also found to be useful in contouring the meter's response function. The WENDI rem meters were designed and optimized using the Los Alamos Monte Carlo codes MCNP, MCNPX, and LAHET, A first generation prototype (WENDI-I) was built in 1995 and its testing was completed in 1996. This design placed a BF, counter in the center of a spherical moderator assembly, whose outer shell consisted of 30% by weight WC in a matrix of polyethylene. A berated silicone rubber (5% boron by weight) absorber covered an inner polyethylene sphere to control the meter's response at intermediate energies. A second generation design (WENDI-II) was finalized and tested in 1999, It further extended the high-energy response beyond 20 MeV, increased sensitivity, and greatly facilitated the manufacturing process. A He-3 counter tube is located in the center of a cylindrical polyethylene moderator assembly. Tungsten powder surrounds the counter tube at an inner radius of 4 cm and performs the double duty of neutron generation above 8 MeV and absorption below several keV, WENDI-II is suitable for field use as a portable rem meter in a variety of work place environments, and has been recently commercialized under license by Eberline Instruments, Inc. and Ludlum Measurements, Inc. Sensitivity is about a factor of 12 higher than that of the Hankins Modified Sphere (Eberline NRD meter) in a bare Cf-252 field. Additionally, the energy response for WENDI-II closely follows the contour of the Ambient Dose Equivalent per unit fluence function [H'(10)Phi] above 0.1 MeV. Its energy response at 500 MeV is approximately 15 times higher than that of the Hankins and Andersson-Braun meters. Measurements of the energy and directional response of the improved meter are presented and the measured response function is shown to agree closely with the predictions of the Monte Carlo simulations in the range from 0.144 MeV to 19 MeV. C1 Univ Calif Los Alamos Natl Lab, Hlth Phys Measurements Grp, Los Alamos, NM 87545 USA. Ancore SAIC, Santa Clara, CA 95054 USA. Varian Associates Inc, Palo Alto, CA 94304 USA. EM dick@lanl.gov NR 34 TC 82 Z9 82 U1 0 U2 4 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 AUG PY 2000 VL 79 IS 2 BP 170 EP 181 PG 12 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 334PF UT WOS:000088194300008 PM 10910387 ER PT J AU Pritchard, DA Vigil, JT AF Pritchard, DA Vigil, JT TI The development of a digital video motion detection test set SO IEEE AEROSPACE AND ELECTRONIC SYSTEMS MAGAZINE LA English DT Article AB This paper describes the current effort to develop a standardized data set, or suite of digital video sequences, that can be used for test and evaluation of digital video motion detectors (VMDs) for exterior applications. We have drawn from an extensive video database of typical application scenarios to assemble a comprehensive data set. These data, some existing for many years on analog videotape, have been converted to a reproducible digital format and edited to generate test sequences several minutes long for many scenarios. Sequences include non-alarm video, intrusions and nuisance alarm sources, taken with a variety of imaging sensors including monochrome CCD cameras and infrared (thermal) imaging cameras, under a variety of daytime and nighttime conditions. The paper presents an analysis of the variables and estimates the complexity of a thorough data set. Some of this video data test has been digitized for CD-ROM storage and playback. We are considering developing a DVD disk for possible use in screening and testing VMDs prior to government testing and deployment. In addition, this digital video data may be used by VMD developers for further refinement or customization of their product to meet specific requirements. These application scenarios may also be used to define the testing parameters for future procurement qualification. A personal computer may be used to play back either the CD-ROM or the DVD video data. A consumer electronics-style DVD player may be used to replay the DVD disk. This paper also discusses various aspects of digital video storage including formats, resolution, CD-ROM and DVD storage capacity, formats, editing and playback. C1 Sandia Natl Labs, Livermore, CA 94550 USA. RP Pritchard, DA (reprint author), POB 5800,MS 0780, Albuquerque, NM 87185 USA. NR 8 TC 0 Z9 0 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0885-8985 J9 IEEE AERO EL SYS MAG JI IEEE Aerosp. Electron. Syst. Mag. PD AUG PY 2000 VL 15 IS 8 BP 33 EP 39 DI 10.1109/62.861771 PG 7 WC Engineering, Aerospace; Engineering, Electrical & Electronic SC Engineering GA 342VQ UT WOS:000088666200010 ER PT J AU Baca, AG Heller, EJ Casalnuovo, SA Frye-Mason, GC Klem, JF Drummond, TJ AF Baca, AG Heller, EJ Casalnuovo, SA Frye-Mason, GC Klem, JF Drummond, TJ TI Development of a GaAs monolithic surface acoustic wave integrated circuit (vol 34, pg 1254, 1999) SO IEEE JOURNAL OF SOLID-STATE CIRCUITS LA English DT Correction C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Baca, AG (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 6 TC 0 Z9 0 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0018-9200 J9 IEEE J SOLID-ST CIRC JI IEEE J. Solid-State Circuit PD AUG PY 2000 VL 35 IS 8 BP 1253 EP 1253 DI 10.1109/4.859520 PG 1 WC Engineering, Electrical & Electronic SC Engineering GA 343TE UT WOS:000088717000027 ER PT J AU Forrest, S Burrows, P Thompson, M AF Forrest, S Burrows, P Thompson, M TI The dawn of organic electronics SO IEEE SPECTRUM LA English DT Article ID DEVICES; DIODES C1 Princeton Univ, Princeton, NJ 08544 USA. Pacific NW Natl Lab, Richland, WA 99352 USA. Univ So Calif, Los Angeles, CA 90089 USA. RP Forrest, S (reprint author), Princeton Univ, Princeton, NJ 08544 USA. OI Thompson, Mark/0000-0002-7764-4096 NR 9 TC 130 Z9 133 U1 0 U2 15 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0018-9235 J9 IEEE SPECTRUM JI IEEE Spectr. PD AUG PY 2000 VL 37 IS 8 BP 29 EP 34 DI 10.1109/6.861775 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA 344GK UT WOS:000088750700017 ER PT J AU Brunett, BA Van Scyoc, JM Hilton, NR Lund, JC James, RB AF Brunett, BA Van Scyoc, JM Hilton, NR Lund, JC James, RB TI The performance effects of crystal boundaries in cadmium zinc telluride radiation spectrometers SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT Nuclear Science Symposium (NSS) CY OCT 26-28, 1999 CL SEATTLE, WASHINGTON AB The specific performance effects of extended crystal defects in cadmium zinc telluride (CZT) radiation spectrometers have been investigated. While it is generally accepted that defects such as grain boundaries and decorated twins can have a significant deleterious impact on the performance of semiconductor radiation spectrometers, the detailed mechanisms of degradation have been previously unexplored. Because of the difficulties of the high pressure Bridgman (HPB) growth process, CZT materials generally contain a large number of such defects, and the yield of defect-free crystals is comparatively low. High-resolution gamma-ray response mapping has been combined with analytical spectral simulations to relate the anomalies in the measured detector response to the likely originating defect. Examples of several different types of boundaries have been examined in a range of commercial CZT detectors, with the relevant parameters of the boundary being its trapping or channeling nature and the properties of the material on each side of the boundary. C1 Sandia Natl Labs, Livermore, CA 94550 USA. RP Brunett, BA (reprint author), Sandia Natl Labs, Livermore, CA 94550 USA. NR 10 TC 2 Z9 3 U1 1 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 2000 VL 47 IS 4 BP 1353 EP 1359 DI 10.1109/23.872977 PN 1 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA 358UU UT WOS:000089576200012 ER PT J AU Luke, PN Amman, M Phlips, BF Johnson, WN Kroeger, RA AF Luke, PN Amman, M Phlips, BF Johnson, WN Kroeger, RA TI Germanium orthogonal strip detectors with amorphous-semiconductor contacts SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT Nuclear Science Symposium (NSS) CY OCT 26-28, 1999 CL SEATTLE, WASHINGTON AB Germanium orthogonal strip detectors have been produced using amorphous-semiconductor contacts. The amorphous-semiconductor contact fabrication process is relatively simple, and it is capable of producing fine-pitched electrode structures. The bipolar blocking behavior of the amorphous-semiconductor contact permits its use on both sides of a detector, replacing conventional B ion implanted and Li diffused contacts. A 5 X 5 orthogonal strip detector has been produced using this technique. Experimental results from this detector are presented. C1 Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. USN, Res Lab, Washington, DC 20375 USA. George Mason Univ, Fairfax, VA 22030 USA. RP Luke, PN (reprint author), Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RI Johnson, Neil/G-3309-2014 NR 7 TC 12 Z9 12 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 2000 VL 47 IS 4 BP 1360 EP 1363 DI 10.1109/23.872978 PN 1 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA 358UU UT WOS:000089576200013 ER PT J AU Asmus, A Bellwied, R Beuttenmuller, R Chen, W Dyke, H Eremin, V Fiske, DR Hoffmann, GW Humanic, TJ Grau, M Ilyashenko, I Kotov, IV Kraner, HW Leonhardt, B Li, Z Lynn, D Pandey, SU Schambach, J Sedlmeir, J Sugarbaker, E Takahashi, J AF Asmus, A Bellwied, R Beuttenmuller, R Chen, W Dyke, H Eremin, V Fiske, DR Hoffmann, GW Humanic, TJ Grau, M Ilyashenko, I Kotov, IV Kraner, HW Leonhardt, B Li, Z Lynn, D Pandey, SU Schambach, J Sedlmeir, J Sugarbaker, E Takahashi, J TI Probe station testing of large area silicon drift detectors SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT Nuclear Science Symposium (NSS) CY OCT 26-28, 1999 CL SEATTLE, WASHINGTON AB Probe stations for STAR Silicon Drift Detectors testing were developed and built at BNL and Ohio State University. A throughput of a wafer per day per probe station was reached. Testing procedure and probe station design criteria are discussed. C1 Ohio State Univ, Columbus, OH 43210 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Univ Texas, Austin, TX 78712 USA. Wayne State Univ, Detroit, MI 48201 USA. IHEP, RU-148284 Moscow, Russia. AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia. Univ Sao Paulo, BR-05508 Sao Paulo, Brazil. RP Kotov, IV (reprint author), Ohio State Univ, Columbus, OH 43210 USA. RI Takahashi, Jun/B-2946-2012 OI Takahashi, Jun/0000-0002-4091-1779 NR 12 TC 3 Z9 3 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 2000 VL 47 IS 4 BP 1375 EP 1380 DI 10.1109/23.872981 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA 358UU UT WOS:000089576200016 ER PT J AU Zhang, WC Li, Z Siddons, DP Huang, T Zhao, LJ Kakuno, EM Pietraski, P Li, CJ AF Zhang, WC Li, Z Siddons, DP Huang, T Zhao, LJ Kakuno, EM Pietraski, P Li, CJ TI Design, simulation and testing of large area silicon drift detectors and detector array for X-ray spectroscopy SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT Nuclear Science Symposium (NSS) CY OCT 26-28, 1999 CL SEATTLE, WASHINGTON AB Large area (25 mm(2)) silicon drift detectors and detector arrays (5x5) have been designed, simulated, and fabricated for X-ray spectroscopy. On the anode side, the hexagonal drift detector was designed with self-biasing spiral cathode rings (p(+)) of fixed resistance between rings and with a grounded guard anode to separate surface current from the anode current. Two designs have been used for the P-side: symmetric self-biasing spiral cathode rings (p(+)) and a uniform backside p(+) implant. Only 3 to 5 electrodes are needed to bias the detector plus an anode for signal collection. With graded electrical potential, a sub-nanoamper anode current, and a very small anode capacitance, an initial FWHM of 1.3 keV, without optimization of all parameters, has been obtained for 5.9 keV Fe-55 X-ray at RT using a uniform backside detector. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. Chinese Acad Sci, Inst Semicond, Beijing 100083, Peoples R China. RP Zhang, WC (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 4 TC 10 Z9 10 U1 0 U2 7 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 2000 VL 47 IS 4 BP 1381 EP 1385 DI 10.1109/23.872982 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA 358UU UT WOS:000089576200017 ER PT J AU Han, SH Hong, WS Kim, HK Kim, JG Park, IJ Kadyk, J Wenzel, W Perez-Mendez, V AF Han, SH Hong, WS Kim, HK Kim, JG Park, IJ Kadyk, J Wenzel, W Perez-Mendez, V TI Insensitive zones and space resolution of microdot (MDOT) detectors of 50, 100 and 200 micron pitch SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT Nuclear Science Symposium (NSS) CY OCT 26-28, 1999 CL SEATTLE, WASHINGTON ID AVALANCHE AB Insensitive regions and spatial resolution of microdot (MDOT) detectors with 200 mu m, 100 mu m, and 50 mu m pitches were; studied using a collimated X-ray beam as a probe. The insensitive: zones measured by the probe-scan were compared with those estimated previously from the drift-voltage dependence of the count rate. The X-ray probe-scan along an isolated strip of a ganged linear array; of MDOT anodes showed significant insensitive zones in the 200 mu m pitch detector, but less in the 100 mu m and 50 mu m pitch detectors. The measured projected spatial widths were 80 mu m, 55 mu m, and 51 mu m for the 200 mu m, 100 mu m, and 50 mu m pitch detectors, respectively. Together with gain measurements made previously, these results suggest that 100 mu m is the optimum pitch to minimize insensitive zones, and achieve good spatial resolution and good avalanche gain. C1 Lawrence Berkeley Natl Lab, Div Phys, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Div Engn, Berkeley, CA 94720 USA. Kyungpook Natl Univ, Dept Phys, Taegu 702701, South Korea. Korea Adv Inst Sci & Technol, Dept Nucl Engn, Taejon 305701, South Korea. Myongji Univ, Dept Phys, Yongin 449728, Kyunggi Do, South Korea. RP Han, SH (reprint author), Lawrence Berkeley Natl Lab, Div Phys, Berkeley, CA 94720 USA. NR 8 TC 2 Z9 2 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 2000 VL 47 IS 4 BP 1416 EP 1420 DI 10.1109/23.872988 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA 358UU UT WOS:000089576200023 ER PT J AU Rehak, P Smith, GC Warren, JB Yu, B AF Rehak, P Smith, GC Warren, JB Yu, B TI First results from the micro pin array detector (MIPA) SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT Nuclear Science Symposium (NSS) CY OCT 26-28, 1999 CL SEATTLE, WASHINGTON ID GAS AB A technique for electron multiplication in gas is being developed that lends itself to easy fabrication with lithographic techniques. Moreover, the electrical characteristics of the resulting device are very stable. Comprising an array of anode pins that are recessed into a closely-packed hexagonal Cathode, the MIcro-Pin Array (MIPA) represents a promising addition to micro-pattern detectors with two-dimensional sensitivity. We describe the electrostatic rationale behind the MIPA detectors design, the fabrication technique, and X-ray results that illustrate electrical stability and high rate capability. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Rehak, P (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 6 TC 7 Z9 7 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 2000 VL 47 IS 4 BP 1426 EP 1429 DI 10.1109/23.872990 PN 1 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA 358UU UT WOS:000089576200025 ER PT J AU De Geronimo, G O'Connor, P AF De Geronimo, G O'Connor, P TI A CMOS fully compensated continuous reset system SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT Nuclear Science Symposium (NSS) CY OCT 26-28, 1999 CL SEATTLE, WASHINGTON ID DETECTORS; CDTE AB As a result of a cooperation between Brookhaven National Laboratory and eV Products a generation of high performance readout ASICs was developed. One of the novel circuit solutions implemented in the ASICs is a fully compensated continuous reset system capable of handling detector leakage currents up to: several tens of nA with high linearity and with noise contribution always lower than the shot noise contribution of the detector. The reset is based on the use of a MOSFET operating above threshold and in saturation. The full compensation is obtained by using a suitable replica of the reset:MOSFET. The experimental results are reported. Evaluation and measurement of the noise contribution and of the dependence of the gain on the leakage current are also discussed. C1 Brookhaven Natl Lab, Instrumentat Div, Upton, NY 11973 USA. RP De Geronimo, G (reprint author), Brookhaven Natl Lab, Instrumentat Div, Bldg 535B, Upton, NY 11973 USA. NR 9 TC 45 Z9 45 U1 1 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 2000 VL 47 IS 4 BP 1458 EP 1462 DI 10.1109/23.872996 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA 358UU UT WOS:000089576200031 ER PT J AU Borchi, E Bruzzi, M Li, Z Pirollo, S AF Borchi, E Bruzzi, M Li, Z Pirollo, S TI Shallow level analysis in irradiated silicon SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT Nuclear Science Symposium (NSS) CY OCT 26-28, 1999 CL SEATTLE, WASHINGTON ID THERMALLY STIMULATED CURRENT; RADIATION HARDNESS; LOW-TEMPERATURES; DETECTORS; SEMICONDUCTORS; SPECTROSCOPY; TRAPS AB Silicon p(+)/n/n(+) junctions with nominal starting resistivity of 4-6 k Ohm cm have been irradiated with a 1 MeV neutron-equivalent fluence up to 4.10(14) cm(-2). In order to investigate the changes in the shallow level concentrations induced by irradiation, low temperature Thermally Stimulated Current measurements have been performed. For fluences over 10(13) cm(-2) a phosphorous removal is observed, probably due to the formation of the vacancy-phosphorous complex. C1 Univ Florence, Dipartimento Energet, I-50139 Florence, Italy. INFM, I-50125 Florence, Italy. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Borchi, E (reprint author), Univ Florence, Dipartimento Energet, Via S Marta 3, I-50139 Florence, Italy. RI Bruzzi, Mara/K-1326-2015 OI Bruzzi, Mara/0000-0001-7344-8365 NR 15 TC 1 Z9 2 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 2000 VL 47 IS 4 BP 1474 EP 1477 DI 10.1109/23.872999 PN 1 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA 358UU UT WOS:000089576200034 ER PT J AU Lundqvist, M Cederstrom, B Chmill, V Danielsson, M Nygren, D AF Lundqvist, M Cederstrom, B Chmill, V Danielsson, M Nygren, D TI Computer simulations and performance measurements on a silicon strip detector for edge-on imaging SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT Nuclear Science Symposium (NSS) CY OCT 26-28, 1999 CL SEATTLE, WASHINGTON AB Silicon strip detectors to be used edge-on for imaging in a scanned slit geometry have been simulated. A software program was developed which can simulate the motion of free charges in the bulk detector and calculate the signals they induce on the electrodes. The purpose was to quantify the impact of charge sharing on system detective quantum efficiency(DQE). The energy spectrum that was used in this study is typical for mammography. The detectors are working in single photon counting mode and the optimal threshold level to discriminate noise from useful signals has been calculated. The loss in detective quantum efficiency due to charge sharing was found to be around 5% for a 100 mu m pitched detector. Coincidence circuits can be included in the electronics to eliminate this problem. Furthermore, it is described how the relationship between charge collection efficiency and photon interaction position in the detector can be measured. C1 Royal Inst Technol, Dept Phys, SE-10405 Stockholm, Sweden. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Phys, Berkeley, CA 94720 USA. RP Lundqvist, M (reprint author), Royal Inst Technol, Dept Phys, SE-10405 Stockholm, Sweden. NR 8 TC 16 Z9 16 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 2000 VL 47 IS 4 BP 1487 EP 1492 DI 10.1109/23.873002 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA 358UU UT WOS:000089576200037 ER PT J AU Shaw, TM Stuermer, W Wesson, TR Wilson, PJ AF Shaw, TM Stuermer, W Wesson, TR Wilson, PJ TI Protocols and standard Crate configuration for a typical CDF Run 2 readout crate SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT Nuclear Science Symposium (NSS) CY OCT 26-28, 1999 CL SEATTLE, WASHINGTON AB This paper describes a standard for the readout and the trigger interface of a VMEbus based crate to be used by the front-end and trigger electronics of the CDF (Colliding Detector Facility) Run 2 experiment. Hereafter, this crate will be referred to as the CDF Readout Crate. The goal is to standardize the implementation of functions that are common among all systems (i.e. power distribution, timing signals, DAQ functions) while allowing some flexibility with other-functions (e.g. cooling, rear transition modules, J3 backplanes, etc.). This allows designers of cards that satisfy this standard to have access to a common well defined crate system with interfaces to the trigger and DAQ system, allowing them to concentrate their efforts on the functions they need. This paper lists the mechanical specifications, readout scheme, backplane and signal distribution specifications of the CDF Readout Crate. The paper will-also go into some detail on the TRigger And Clock + Event Readout (TRACER) module, a common CDF crate module which provides the crate interface lo the system clock and the trigger system. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Shaw, TM (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 10 TC 1 Z9 1 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 2000 VL 47 IS 4 BP 1506 EP 1509 DI 10.1109/23.873006 PN 1 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA 358UU UT WOS:000089576200041 ER PT J AU Pietraski, PJ Zojceski, Z AF Pietraski, PJ Zojceski, Z TI Fast centroid estimation algorithm for high-rate detectors based on a two-point Gaussian fit SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT Nuclear Science Symposium (NSS) CY OCT 26-28, 1999 CL SEATTLE, WASHINGTON ID GAS PROPORTIONAL DETECTORS; POSITION AB Recent developments in detector back-end electronics for position sensitive gas proportional detectors have moved the data processing bottleneck out of the front-end electronics and into signal:processing. Even with today's fastest DSP's, the centroid estimation of the cathode charge distribution can impose a limitation on the ultimate count rate attainable by the detector. Here we present a centroid-finding algorithm that does the:bulk of the centroid calculations based on a two-point Gaussian:fit that assumes apriori knowledge of the distribution's variance. The variance is estimated only in the calibration phase. The two-point algorithm has the advantage that no division is required, greatly reducing the computational burden on the DSP. The performance of the algorithm is evaluated by implementation on existing detectors. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. Inst Phys Nucl, F-91406 Orsay, France. RP Pietraski, PJ (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 12 TC 1 Z9 2 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 2000 VL 47 IS 4 BP 1510 EP 1515 DI 10.1109/23.873007 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA 358UU UT WOS:000089576200042 ER PT J AU Bonetto, P Qi, JY Leahy, RM AF Bonetto, P Qi, JY Leahy, RM TI Covariance approximation for fast and accurate computation of channelized Hotelling observer statistics SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article ID IMAGE-RECONSTRUCTION; MAP RECONSTRUCTIONS; PET; LIKELIHOOD; VARIANCE; QUALITY AB We describe a method for computing linear observer statistics for maximum a posteriori (MAP) reconstructions of PET images. The method is based on a theoretical approximation for the mean and covariance of MAP reconstructions. In particular, we derive here a closed form for the channelized Hotelling observer (CHO) statistic applied to 2D MAP images. The theoretical analysis models both the Poission statistics of PET data and the inhomogeneity of tracer uptake. We show reasonably good correspondence between these theoretical results and Monte Carlo studies. The accuracy and low computational cost of the approximation allow us to analyze the observer performance over a wide range of operating conditions and parameter settings for the MAP reconstruction algorithm. C1 Univ So Calif, Inst Signal & Image Proc, Los Angeles, CA 90089 USA. Univ Genoa, Dipartimento Informat & Sci Informazione, Genoa, Italy. Lawrence Berkeley Lab, Ctr Funct Imaging, Berkeley, CA 94720 USA. RP Bonetto, P (reprint author), Univ So Calif, Inst Signal & Image Proc, Los Angeles, CA 90089 USA. RI Qi, Jinyi/A-1768-2010 OI Qi, Jinyi/0000-0002-5428-0322 NR 16 TC 46 Z9 46 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 2000 VL 47 IS 4 BP 1567 EP 1572 DI 10.1109/23.873017 PN 2 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA 358UW UT WOS:000089576400006 ER PT J AU Seidel, J Vaquero, JJ Barbosa, F Lee, IJ Cuevas, C Green, MV AF Seidel, J Vaquero, JJ Barbosa, F Lee, IJ Cuevas, C Green, MV TI Scintillator identification and performance characteristics of LSO and GSO PSPMT detector modules combined through common X and Y resistive dividers SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article ID DEPTH AB Combining signal channels from detector arrays can reduce complexity and minimize cost but, potentially, at the expense of other performance parameters. We evaluated a method that reduces the number of signals by combining the anode outputs of three position-sensitive photomultiplier tubes (PSPMTs) through a common Ii resistive charge divider and three individual Y resistive charge dividers. Field flood images at 511 keV of two LSO modules combined with a single GSO module were compared to images obtained when the modules were illuminated separately. At moderate count rates only a small reduction in position detection accuracy was observed in the combined tubes. Event mis-positioning was minimal for total count rates < 300,000 cps. At higher rates, pulse pileup degraded accuracy. Delayed charge integration, a method for identifying scintillators by differences in their light decay times, allowed the LSO and GSO arrays to be distinguished from one another and also reduced the effect of pulse pileup. Thus, combining PSPMTs anodes through common X and common Y resistive dividers may be useful in reducing signal number from PSPMT detector modules while maintaining good event localization and scintillator identification accuracy at reasonable event rates. C1 NIH, Bethesda, MD 20892 USA. Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Seidel, J (reprint author), NIH, Bldg 10, Bethesda, MD 20892 USA. RI Vaquero, Juan Jose/D-3033-2009 OI Vaquero, Juan Jose/0000-0001-9200-361X NR 7 TC 9 Z9 9 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 2000 VL 47 IS 4 BP 1640 EP 1645 DI 10.1109/23.873028 PN 2 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA 358UW UT WOS:000089576400017 ER PT J AU Campbell, LP Dilley, CE Gottschalk, SC Kimura, WD Quimby, DC Steinhauer, LC Babzien, M Ben-Zvi, I Gallardo, JC Kusche, KP Pogorelsky, IV Skaritka, JR van Steenbergen, A Yakimenko, VE Cline, DB He, P Liu, YB Pantell, RH AF Campbell, LP Dilley, CE Gottschalk, SC Kimura, WD Quimby, DC Steinhauer, LC Babzien, M Ben-Zvi, I Gallardo, JC Kusche, KP Pogorelsky, IV Skaritka, JR van Steenbergen, A Yakimenko, VE Cline, DB He, P Liu, YB Pantell, RH TI Inverse Cerenkov acceleration and inverse free-electron laser experimental results for staged electron laser acceleration SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article DE carbon dioxide lasers; electron accelerators; electron linear accelerators; inverse Cerenkov accelerators; inverse free electron laser; laser accelerators; linear accelerators; particle beam measurements ID STELLA EXPERIMENT; ENERGY AB The goal of the staged electron laser acceleration (STELLA) experiment is to demonstrate staging of the laser acceleration process whereby an inverse free electron laser (IFEL) Hill be used to prebunch the electrons, which are then accelerated in an inverse Cerenkov accelerator (ICA), As preparation for this experiment, a new permanent magnet wiggler for the IFEL was constructed and the ICA system was modified, Both systems have been tested on a new beamline specifically built for STELLA. The improved electron beam (e-beam) with its very low emittance (0.8 mm-mrad normalized) enabled focusing the e-beam to an average radius (1 sigma) of 65 mum within the ICA interaction region. This small e-beam focus greatly enhanced the ICA process and resulted in electron energy spectra that have demonstrated the best agreement to date in both overall shape and magnitude with the model predictions. The electron energy spectrum using the new wiggler in the IFEL was also measured. These results will be described as well as future improvements to the STELLA experiment. C1 STI Optron Inc, Bellevue, WA 98004 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Univ Calif Los Angeles, Los Angeles, CA 90095 USA. Stanford Univ, Stanford, CA 94305 USA. RP Campbell, LP (reprint author), STI Optron Inc, Bellevue, WA 98004 USA. OI Gallardo, Juan C/0000-0002-5191-3067 NR 16 TC 4 Z9 4 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD AUG PY 2000 VL 28 IS 4 BP 1143 EP 1151 DI 10.1109/27.893294 PG 9 WC Physics, Fluids & Plasmas SC Physics GA 396EP UT WOS:000166623600012 ER PT J AU Ferrario, M Katsouleas, TC Serafini, L Ben Zvi, I AF Ferrario, M Katsouleas, TC Serafini, L Ben Zvi, I TI Adiabatic plasma buncher SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article DE bunching; injector; plasma accelerator; pulsed photodiode ID ELECTRON BUNCHES AB In this paper, we present a new scheme of injection into a plasma accelerator, aimed at producing a high-quality beam while relaxing the demands on the bunch length of the injected beam. The beam dynamics in the injector, consisting of a high-voltage pulsed photodiode, is analyzed and optimized to produce a lambda (p)/20 long electron bunch at 2.5 MeV, This bunch is injected into a plasma wave in which it compresses down to lambda (p)/100, while accelerating up to 250 MeV. This simultaneous bunching and acceleration of a high-quality beam requires a proper combination of injection energy and injection phase, Preliminary results from simulations are shown to assess the potentials of the scheme. C1 Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ So Calif, Los Angeles, CA 90089 USA. Ist Nazl Fis Nucl, I-20133 Milan, Italy. Brookhaven Natl Lab, Upton, NY 11973 USA. RP Ferrario, M (reprint author), Ist Nazl Fis Nucl, Lab Nazl Frascati, POB 13, I-00044 Frascati, Italy. NR 9 TC 6 Z9 7 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD AUG PY 2000 VL 28 IS 4 BP 1152 EP 1158 DI 10.1109/27.893295 PG 7 WC Physics, Fluids & Plasmas SC Physics GA 396EP UT WOS:000166623600013 ER PT J AU Shvets, G Fisch, NJ Pukhov, A AF Shvets, G Fisch, NJ Pukhov, A TI Acceleration and compression of charged particle bunches using counterpropagating laser beams SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article DE injectors; laser-plasma interactions; plasma accelerators ID PLASMA CHANNEL; PULSES AB The nonlinear interaction between counterpropagating laser beams in a plasma results in the generation of large (enhanced) plasma wakes. The two beams need to be slightly detuned in frequency, and one of them has to be ultrashort (shorter than a plasma period), Thus produced wakes have a phase velocity close to the speed of light and can be used for acceleration and compression of charged bunches, The physical mechanism responsible for the enhanced wake generation is qualitatively described and compared with the conventional laser wakefield mechanism. We also demonstrate that depending on the sign of the frequency difference between the lasers, the enhanced wake can be used as a "snow-plow" to accelerate and compress either positively or negatively charged bunches. This ability can be used in an electron-positron injector. C1 Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. Max Planck Inst Quantum Opt, D-85748 Garching, Germany. RP Shvets, G (reprint author), Princeton Univ, Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. RI pukhov, alexander/C-8082-2016 NR 21 TC 9 Z9 9 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD AUG PY 2000 VL 28 IS 4 BP 1194 EP 1201 PG 8 WC Physics, Fluids & Plasmas SC Physics GA 396EP UT WOS:000166623600020 ER PT J AU Anders, A AF Anders, A TI Chopping effect observed at cathodic arc initiation SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article DE chopping current; vacuum arcs; vacuum interrupters; voltage spikes ID VACUUM ARCS AB Chopping of current and induction of high-voltage spikes has been observed at the rising edge of cathodic vacuum area, It is argued that current chopping at the rising edge is similar to the current chopping effect that is well known for the are current approaching current-zero. Current chopping can generate high-voltage spikes, and thus, cathodic are equipment should be protected against voltage spikes that exceed the system's nominal voltage by an order of magnitude. C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Anders, A (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RI Anders, Andre/B-8580-2009 OI Anders, Andre/0000-0002-5313-6505 NR 8 TC 9 Z9 9 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD AUG PY 2000 VL 28 IS 4 BP 1303 EP 1304 DI 10.1109/27.893320 PG 2 WC Physics, Fluids & Plasmas SC Physics GA 396EP UT WOS:000166623600032 ER PT J AU Myers, TJ Radke, CJ AF Myers, TJ Radke, CJ TI Transient foam displacement in the presence of residual oil: Experiment and simulation using a population-balance model SO INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH LA English DT Article ID GAS-BLOCKING AGENT; POROUS-MEDIA; PETROLEUM RESERVOIRS; CRUDE-OIL; FLOW; STABILITY; PRESSURE; CAPILLARIES; SANDSTONE AB The population-balance framework of Kovscek, Patzek, and Radke is extended to model the flow of foam in porous media containing residual oil (Kovscek et al. Chem. Eng, Sci. 1995, 50 3783). A mechanistic rate of coalescence due to oil, based on the recently proposed pinch-off mechanism (Myers, T. J. Ph.D. Dissertation, University of California, Berkeley, CA), is included in the model. New foam-flow experiments in the absence and presence of residual oil in 1.1- and 0.28-mu m(2) Berea sandstone cores 60-cm long are modeled. Results reported here are for total superficial velocities of 30 cm/day and 97% foam quality with a 0.5 wt % sodium dodecyl sulfate 0.5 wt % NaCl aqueous solution, and a decane oil phase. Additional results at varying gas and liquid velocities are reported elsewhere. Agreement between experiment and simulation is good. Both experiment and simulation show that foam is destabilized by oil and has lower mobility in higher permeability media regardless of the presence of oil. These findings suggest that in an oil reservoir foam will preferentially flow through low-permeability oil-containing regions of the reservoir and partially block high-permeability oil-depleted regions as compared to a Newtonian fluid. C1 Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Radke, CJ (reprint author), Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA. OI Myers, Timothy/0000-0003-2502-2989 NR 64 TC 32 Z9 32 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0888-5885 J9 IND ENG CHEM RES JI Ind. Eng. Chem. Res. PD AUG PY 2000 VL 39 IS 8 BP 2725 EP 2741 DI 10.1021/ie990909u PG 17 WC Engineering, Chemical SC Engineering GA 343WZ UT WOS:000088726600013 ER PT J AU Ali, SA Gauglitz, PA Rossen, WR AF Ali, SA Gauglitz, PA Rossen, WR TI Stability of solids-coated liquid layers between bubbles SO INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH LA English DT Article ID PARTICLES AB In principle, liquid layers between bubbles can be stabilized by a coating of fine solid particles even in the absence of surface-active agents in the liquid. Theoretical modeling of a two-dimensional liquid layer between bubbles containing one row of solid particles suggests that in three dimensions such a layer would be unstable unless the solids all touch. This hints at a possible mechanism for bubble stabilization and subsequent rupture in the waste stored in underground tanks at the Hanford nuclear reservation. C1 Univ Texas, Dept Petr & Geosyst Engn, Austin, TX 78712 USA. Pacific NW Lab, Richland, WA 99352 USA. RP Rossen, WR (reprint author), Univ Texas, Dept Petr & Geosyst Engn, Austin, TX 78712 USA. NR 9 TC 17 Z9 17 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0888-5885 J9 IND ENG CHEM RES JI Ind. Eng. Chem. Res. PD AUG PY 2000 VL 39 IS 8 BP 2742 EP 2745 DI 10.1021/ie990921m PG 4 WC Engineering, Chemical SC Engineering GA 343WZ UT WOS:000088726600014 ER PT J AU Torget, RW Kim, JS Lee, YY AF Torget, RW Kim, JS Lee, YY TI Fundamental aspects of dilute acid hydrolysis/fractionation kinetics of hardwood carbohydrates. 1. Cellulose hydrolysis SO INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH LA English DT Article ID PLUG FLOW REACTOR; SULFURIC-ACID; BIOMASS; SACCHARIFICATION; LIGNOCELLULOSE; FERMENTATION AB Previous kinetic modeling and bench-scale demonstration efforts using batch, percolation, or plug-flow reactors for the dilute sulfuric acid hydrolysis of cellulose have concluded that glucose yields above 70% of theoretical were not possible. This has been explained to be a result of reactions involving glucose or the cellulose itself in a destructive manner, as well as hydrolyzed soluble oligomers which have been modified chemically so as not to release glucose. However, recently, we have demonstrated that near-quantitative yields of glucose from cellulose can indeed be obtained using a bench-scale shrinking-bed percolation reactor in which an internal spring compresses the biomass as the reaction progresses; The present study was initiated to gain a fundamental understanding of the kinetic sequences involved in these high yields. Three reactor configurations (batch, percolation, and shrinking-bed percolation) were studied using similar hydrolysis severities to begin addressing chemical, physical, and hypothesized boundary layer phenomenon governing rate-limiting steps of glucose release from two prehydrolyzed yellow poplar cellulosic substrates. The characteristics of the logarithmic release of glucose as well as the logarithmic disappearance of cellulose as a linear function of time were found to be reactor dependent. Use of a percolation reactor was described where the initial hydrolysis rate constant for cellulose using 0.07% w/w sulfuric acid at 225 degrees C is enhanced Et-fold compared to a batch reactor. Additionally, when lower hydrolysis severities are used for hydrolyzing yellow poplar cellulose in batch mode, biphasic kinetics were observed. Several hypothesized boundary layer resistances, such as structured water, viscosity, and re-hydrogen bonding of released glucose, will be suggested as diffusion resistances for released glucose to the bulk medium, which would be a function of the reactor configuration and define potential glucose yields. C1 Natl Renewable Energy Lab, Biotechnol Ctr Fuels & Chem, Golden, CO 80401 USA. Auburn Univ, Dept Chem Engn, Auburn, AL 36849 USA. RP Torget, RW (reprint author), Natl Renewable Energy Lab, Biotechnol Ctr Fuels & Chem, Golden, CO 80401 USA. NR 33 TC 104 Z9 119 U1 5 U2 39 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0888-5885 J9 IND ENG CHEM RES JI Ind. Eng. Chem. Res. PD AUG PY 2000 VL 39 IS 8 BP 2817 EP 2825 DI 10.1021/ie990915q PG 9 WC Engineering, Chemical SC Engineering GA 343WZ UT WOS:000088726600025 ER EF