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Displaying 1551 - 1575 of 2105

Utilization of Prompt-gamma Neutron Activation Analysis in the Evaluation of Nafion Membranes

May 21, 2003

Author(s)

S K. Young, S F. Trevino, N C. Tan, Rick L. Paul

Advances in Optical Methods for Trace Gas Analysis

May 1, 2003

Author(s)

Pamela M. Chu

The fundamental principles for chemical analysis by optical methods are established. However, only recent advances in instrumentation and spectroscopic techniques have substantially expended the feasibility of routine spectroscopic analysis of gaseous

Elemental Composition of Liver and Kidney Tissue of Rough Toothed Dolphins (Steno bredanensis)

May 1, 2003

Author(s)

Elizabeth A. Mackey, R. D. Oflaz, Michael S. Epstein, B. Buehler, Barbara J. Porter, T. Rowles, Stephen A. Wise, Paul R. Becker

The Determination of Water in Crude Oil and Transformer Oil Reference Materials

May 1, 2003

Author(s)

S A. Margolis, C Hagwood

Structural Variations and Ordering Conditions for the Self-Assembled Monolayers of HS(CH2CH2O)(3-6)CH3

April 29, 2003

Author(s)

David J. Vanderah, J Arsenault, H La, Richard S. Gates, Vitalii I. Silin, Curtis W. Meuse, Gintaras Valincius

The structure and ordering conditions of the self-assembled monolayers (SAMs) of HS(EO)xR, where R = CH3, EO = CH2CH2O, and x = 3 to 6, on polycrystalline gold (Au) were determined by reflection adsorption infrared spectroscopy (RAIRS), spectroscopic

Standards and Reference Materials for Glow Discharge Spectroscopies

April 3, 2003

Author(s)

Michael R. Winchester

Isostructural Self-Assembled Monolayers, Part 1. Octadecyl 1-thiaoligo(ethylene oxides)

April 1, 2003

Author(s)

David J. Vanderah, Richard S. Gates, Vitalii I. Silin, D N. Zeiger, John T. Woodward IV, Curtis W. Meuse, Gintaras Valincius, B Nickel

The self-assembled monolayers (SAMs) of a series of octadecyl 1-thiaoligo(ethylene oxide)x disulfides {[S(CH 2CH 2O) xC 18H 37] 2}, where x = 4 to 8, were assembled on gold and characterized by reflection-adsorption infrared spectroscopy (RAIRS)

A New Standard Reference Material for Column Evaluation in Reversed-Phase Chromatography

March 10, 2003

Author(s)

Lane C. Sander, Stephen A. Wise

Additive Concentration Effects on Enantioselective Separations in Supercritical Fluid Chromatography

March 5, 2003

Author(s)

Karen W. Phinney, Lane C. Sander

Polar additive concentration effects in supercritical fluid chromatography were studied on two chiral stationary phases, Chirobiotic V and Chiralpak AD. Two basic additives, isopropylamine and triethylamine, were incorporated into the methanol modifier at

Determination of Methyl-Substituted Polycyclic Aromatic Hydrocarbons in Diesel Particulate-Related Standard Reference Materials

March 1, 2003

Author(s)

Dianne L. Poster, Bruce A. Benner Jr, Michele M. Schantz, Lane C. Sander, Stephen A. Wise, M. G. Vangel

Development and Analysis of Three Diesel Particulate-Related Standard Reference Materials for the Determination of Chemical, Physical, and Biological Characteristics

March 1, 2003

Author(s)

Dianne L. Poster, M. J. Lopez de Alda, Michele M. Schantz, Lane C. Sander, Stephen A. Wise, M. G. Vangel

Enantioselective Separations in Capillary Electrophoresis with Dextran Sulfate as the Chiral Selector

March 1, 2003

Author(s)

Karen W. Phinney, Lane C. Sander

Evaluation of Extraction Techniques for the Forensic Analysis of Human Scalp Hair Using Gas Chromatography/Mass Spectrometry (GC/MS)

March 1, 2003

Author(s)

J V. Goodpaster, B C. Drumheller, Bruce A. Benner Jr.

The ability of various liquid extraction techniques to isolate the natural and artificial surface components of human scalp hair has been evaluated. These organic components largely consist of sebaceous lipids and hair treatment residues, and have shown

Rare-Earth Glass Reference Materials for Near-Infrared Spectrometry: Correcting and Exploiting Temperature Dependencies

February 15, 2003

Author(s)

Steven J. Choquette, L E. O'Neal, David L. Duewer

Determination and Comparison of Nitrated Polycyclic Aromatic Hydrocarbons Measured in Air and Diesel Particulate Reference Materials

February 1, 2003

Author(s)

H. A. Bamford, D. Z. Bezabeh, Michele M. Schantz, Stephen Wise, J. E. Baker

Determination of Polycyclic Aromatic Hydrocarbons in Diesel Particulate-Related Standard Reference materials by using Gas Chromatography/Mass Spectrometry with Negative Ion Chemical Ionization

February 1, 2003

Author(s)

D. Z. Bezabeh, H. A. Bamford, Michele M. Schantz, Stephen Wise

Evidence for Structural Changes in Carboxyl-Terminal Peptides of Transducin Alpha-Subunit Upon Binding a Soluble Mimic of Light-Activated Rhodopsin

January 21, 2003

Author(s)

D M. Brabazon, N G. Abdulaev, John Marino, K D. Ridge

Although a high-resolution crystal structure for the ground state of rhodopsin is now available, portions of the cytoplasmic surface are not well resolved and the structural basis for the interaction of the cytoplasmic loops with the retinal G-protein

Thermodynamics of the Lipase-Catalyzed Transesterification of 1-Phenyl-1-Alkanols and Butyl Acetate in Organic Solvents

January 16, 2003

Author(s)

Yadu D. Tewari, David J. Vanderah, J D. Rozzell

The thermodynamics of the lipase-catalyzed transesterification reactions of butyl acetate and 1-phenyl-1-alkanols from C 1 to C 4 have been studied in organic solvents. Equilibrium measurements of the reactions with benzyl alcohol and (R)-(+)-1 phenyl

Determination of Polycyclic Aromatic Hydrocarbons with Molecular Weight 300 and 302 in Environmental-Matrix Standard Reference Materials by Gas Chromatography/Mass Spectrometry

January 15, 2003

Author(s)

Patricia Schubert, Michele M. Schantz, Lane C. Sander, Stephen Wise

Certification of Standard Reference Material 970, Ascorbic Acid in Serum, and Analysis of Associated Interlaboratory Bias in the Measurement Process

January 1, 2003

Author(s)

S A. Margolis, M Vangel, David L. Duewer

Determination of Polychlorinated Biphenyl Congeners and Chlorinated Pesticides in a Fish Tissue Standard Reference Material

January 1, 2003

Author(s)

Dianne L. Poster, John R. Kucklick, Michele M. Schantz, Barbara J. Porter, Stefan D. Leigh, Stephen A. Wise

MALDI-TOF MS Characterization of Covalently-Cationized Polymers

January 1, 2003

Author(s)

H M. Byrd, Sheng Lin-Gibson, S Bencherif, David L. VanderHart, Barry J. Bauer, B M. Fanconi, Charles M. Guttman, William E. Wallace

Structural Alterations of the Heme Environment of Cytochrome P450cam and the Y96F Mutant as Deduced by Resonance Raman Spectroscopy

January 1, 2003

Author(s)

G Niaura, Vytas Reipa, M P. Mayhew, Marcia J. Holden, V L. Vilker

Resonance Raman spectroscopy at 2.5 cm-1 resolution was used to probe differences in wild type and Y96F mutant P450cam (CYP101), both with and without bound camphor or styrene substrates. In the substrate-free state, the spin state equilibrium is shifted

Local Protein Dynamics and Catalysis: Detection of Segmental Motion Associated With Rate-Limiting Product Release by a Glutathione Transferase

December 24, 2002

Author(s)

S G. Codreanu, Jane E. Ladner, G Xiao, N V. Stourman, D L. Hachey, G L. Gilliland, R N. Armstrong

Glutathione transferase rGSTM1-1 catalyzes the addition of glutathione (GSH) to 1-chloro-2,4-dinitrobenzene in which chemical step of the reaction is 60-fold faster than the physical step of product release. The hydroxyl group of Y115, located in the

190Pt-1860s and 187Re-1870s Systematics of the Sudbury Igneous Complex

December 16, 2002

Author(s)

J.W. Morgan, R.J. Walker, M.F. Horan, Ellyn S. Beary, A.J. Naldrett

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