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Chemistry

Analytical chemistry

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Displaying 1326 - 1350 of 2094

Monitoring Organic contaminants in Eggs of Alaskan Glaucous & Glaucous-winged Gulls (Larus hyperboreous & L. glaucescens)

April 7, 2009
Author(s)
Stacy S. Schuur, Paul R. Becker, Michael B. Ellisor, Amanda J. Moors, Rebecca S. Pugh, David G. Roseneau
Gull eggs have been used to monitor contaminants in many parts of the world. The Seabird Tissue Archival & Monitoring Project (STAMP) is a long-term program designed to track trends in pollutants in northern marine environments using seabird eggs. Glaucous

Standard Reference Materials to Support Measurement of Fatty Acids

April 7, 2009
Author(s)
Lane C. Sander, Michele M. Schantz, Katherine E. Sharpless, Stephen A. Wise
The National Institute of Standards and Technology offers a variety of natural-matrix and solution-based Standard Reference Materials (SRMs) that are characterized for fatty acid composition. The natural-matrix SRMs are intended primarily for use as

Major Applications of Electrochemical Techniques at National Metrology Institute

March 24, 2009
Author(s)
M Mariassy, Kenneth W. Pratt, Petra Spitzer
A review of the state of the art of electrochemical methods at the highest metrological level in National Metrology Institutes (NMIs) in given, with emphasis on standardization work (primary methods) in the fields of pH and electrolytic conductivity, as

Development of Ultrafast Photochromic Organometallics and Photoinduced Linkage Isomerization of Arene Chromium Carbonyl Derivatives

February 20, 2009
Author(s)
Tung T. To, Edwin J. Heilweil, Duke Charles, Ruddick Kristie, Webster E. Charles, Burkey Theodore
We review recent studies of processes relevant to photoinduced linkage isomerization of organometallic systems with the goal of preparing organometallics with an efficient and ultrafast photochromic response. The organometallic system thus corresponds to

Switching-off Hydrogen Peroxide Hydrogenation in the Direct Synthesis Process

February 20, 2009
Author(s)
Andrew A. Herzing, Jennifer Edwards, Benjamin Solsona, Edwin Ntainjua, Albert F. Carley, Graham J. Hutchings, Christopher J. Kiely
Hydrogen peroxide is an important disinfectant and bleach and is currently manufactured from an indirect process involving sequential hydrogenation/oxidation of anthraquinones. However, a direct process in which hydrogen and oxygen are reacted would be

The Drosophila melanogaster PeptideAtlas facilitates the use of peptide data for improved fly proteomics and genome annotation

February 11, 2009
Author(s)
Sandra Loevenich, Erich Brunner, Nichole King, Stephen Stein, Ernst Hafen, Rudolf Aebersold
Background: Crucial foundations of any quantitative systems biology experiment are correct genome and proteome annotations in the reference databases used. Protein databases compiled from high quality empirical protein identifications, which are - in turn

SEABIRD TISSUE ARCHIVAL AND MONITORING PROJECT: Egg Collections and Analytical Results for 2002-2005

February 5, 2009
Author(s)
Stacy S. Schuur, Paul R. Becker, Russell D. Day, Michael B. Ellisor, Aurore Guichard, Amanda J. Moors, David Point, Rebecca S. Pugh, David G. Roseneau
The Seabird Tissue Archival and Monitoring Project (STAMP) has continued to collect and bank murre and gull eggs to obtain new information on chlorinated pesticides, polychlorinated biphenyls (PCBs), brominated flame retardants, mercury, and organotin

Interlaboratory Comparison Study of Serum Total Testosterone [corrected] Measurements Performed by Mass Spectrometry Methods

January 30, 2009
Author(s)
Susan S. Tai, Hubert W. Vesper, S. Bhasin, C. Wang, L. A. Dodge, R. J. Singh, J. Nelson, S. Ohorodnik, N. J. Clarke, W. A. Salameh, C. R. Parker, Jr., R. Razdan, E. A. Monsell, Gary L. Myers
BACKGROUND: Though mass spectrometry (MS) assays are increasingly used for routine clinical measurements of serum total testosterone (TT), information about the variability of results is limited. This study assessed the variability of TT measurement

Thermal Decomposition Kinetics of Propylcyclohexane

January 21, 2009
Author(s)
Jason A. Widegren, Thomas J. Bruno
As part of a large-scale thermophysical property measurement project, the decomposition kinetics of propylcyclohexane was investigated. Decomposition reactions were performed at 375, 400, 425, and 450 °C in stainless steel ampoule reactors. At each

Striped Domains at the Pentacene:C 60 Interface

January 12, 2009
Author(s)
Dan B. Dougherty, W Jin, J Cullen, J Reutt-Robey, Steven W. Robey
STM observations of the initial growth stages of the first layer of pentacene on a monolayer film of C60 on Ag(111) are presented. Pentacene films nucleate and grow with molecules standing up at the Pentacene:C60 interface similar to the well known thin

Multiplexed "Detectorless" Electrophoresis

December 14, 2008
Author(s)
David Ross, Jason Kralj
A new microfluidic electrophoresis device and technique is described that is designed specifically for multiplexed, high throughput separations. The device consists of an array of short (3 mm) capillaries connecting individual sample reservoirs to a common

Raman Spectroscopic Determination of Electron Concentration in n-Type GaSb

November 19, 2008
Author(s)
James E. Maslar, Wilbur S. Hurst, C Wang
Phonon-plasmon coupled mode Raman spectra of n-type GaSb were measured at room temperature as a function of electron concentration. These spectra were obtained using an optical system based on 752.55 nm excitation. Utilization of this wavelength permits
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