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Chemistry

Analytical chemistry

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Displaying 476 - 500 of 2084

The structural phases and vibrational properties of Mo1-xWxTe2 alloys

September 1, 2017
Author(s)
Sean M. Oliver, Ryan Beams, Sergiy Krylyuk, Arunima Singh, Irina Kalish, Alina Bruma, Francesca Tavazza, Iris Stone, Stephan J. Stranick, Albert Davydov, Patrick M. Vora
The structural polymorphism in transition metal dichalcogenides (TMDs) provides exciting opportunities for developing advanced electronics. For example, MoTe2 crystallizes in the 2H semiconducting phase at ambient temperature and pressure, but transitions

Baseline Assessment of 25-Hydroxyvitamin D Assay Performance: A Vitamin D Standardization Program (VDSP) Interlaboratory Comparison Study

August 18, 2017
Author(s)
Christopher T. Sempos, Stephen Wise, Karen W. Phinney, Susan Tai, Johanna Camara, Gary L. Myers, Ramon Durazo-Arvizu, Lu Tian, John H. Eckfeldt, Andrew N. Hoofnagle, W. Greg Miller, Lorin M. Bachmann, Ian S. Young, J Pettit, G. Caldwell, A Liu, S P. Brooks, K. Sarafin, M. Thamm, C. Scheidt-Nave, G. B. Mensink, M. Busch, M. Rabenberg, Kevin Cashman, Mairead Kiely, Michael Kinsella, K Galvan, J. Y. Zhang, K OH, S. W. Lee, C. L. Jung, L. Cox, G. Goldberg, K. Guberg, S. Meadows, A. Prentice, G. Swan, A. Tedstone, Graham D. Carter, Julia C. Jones, P. Brannon, R. M. Lucas, P. M. Crump, Glenville Jones, E. Cavalier, Joyce Merkel, J. M. Betz
The Vitamin D Standardization Program (VDSP) coordinated an interlaboratory study to assess the comparability of measurements of total 25-hydroxyvitamin D [25(OH)D] in human serum, which is the primary marker of vitamin D status. A set of 50 individual

Single Molecule Nanopore Spectrometry for Peptide Detection

August 15, 2017
Author(s)
Amy Chavis, Joseph Robertson, Joseph E. Reiner, Kyle Brady, Grrace Hatmaker, Nuwan Kothalawala
Sensing and characterization of water-soluble peptides is of critical importance in a wide variety of bioapplications. Single molecule nanopore spectrometry (SMNS) is based on the idea that one can use biological protein nanopores to resolve different

Surface interaction parameter measurement of solvated polymers via model end-tethered chains

August 11, 2017
Author(s)
Richard J. Sheridan, Sara V. Orski, Ronald L. Jones, Sushil K. Satija, Kathryn L. Beers
We present a method for the direct measurement of the relative energy of interaction between a solvated polymer and a solid interface. By tethering linear chains covalently to the surface, we ensured the idealized and constant configuration of polymer

On Neutron Activation Analysis with Gamma,Gamma Coincidence Spectrometry

July 26, 2017
Author(s)
Rolf L. Zeisler, Hana Cho, Ibere Souza Ribeiro Junior, Martin G. Shetty, Danyal J. Turkoglu
A new  coincidence system has been set up at NIST. It is operated with a digital data finder supported by new software developed at NIST. The system is used to explore possible enhancements in instrumental neutron activation analysis (INAA) and study

Exposure to Engineered Nanomaterials: Impact on DNA Repair Pathways

July 13, 2017
Author(s)
Neenu Singh, Bryant C. Nelson, Leona D. Scanlan, Erdem Coskun, Pawel Jaruga, Shareen Doak
Some engineered nanomaterials (ENMs) may have the potential to cause damage to the genetic material in living systems. The mechanistic machinery functioning at the cellular/molecular level, in the form of DNA repair processes, has evolved to help

Photochemical Properties of CH2=CH-CFCl-CF2Br (4-bromo-3-chloro-3,4,4-trifluoro-1-butene) and CH3-O-CH-(CF3)2 (methyl 2,2,2-trifluoroethyl-1-trifluoromethyl ether): OH Reaction Rate Constant, UV and IR Absorption Spectra.

July 7, 2017
Author(s)
Vladimir L. Orkin, Larissa E. Martynova, Michael J. Kurylo III
Abstract Rate constants for the reactions of hydroxyl radicals (OH) with methyl 2,2,2-trifluoroethyl-1-trifluoromethyl ether (CH3-O-CH-(CF3)2 and 4-bromo-3-chloro-3,4,4-trifluoro-1-butene (CH2=CH-CFCl-CF2Br) have been measured over the temperature range

Qualitative characterization of SRM 1597a Coal Tar for polycyclic aromatic hydrocarbons and methyl-substituted derivatives via normal-phase liquid chromatography and gas chromatography/mass spectrometry

June 29, 2017
Author(s)
Walter Wilson, Hugh Hayes, Lane Sander, Andres Campiglia, Stephen Wise
A normal-phase liquid chromatography (NPLC) fractionation procedure was developed for the characterization of a complex mixture of polycyclic aromatic hydrocarbons (PAHs) from a coal tar sample (Standard Reference Material (SRM) 1597a). Using a semi

Revisiting Shape Selectivity in Liquid Chromatography for Polycyclic Aromatic Hydrocarbons (PAHs) - Six-Ring and Seven-Ring Cata-condensed PAH Isomers of Molecular Mass 328 Da and 378 Da

June 28, 2017
Author(s)
Jorge O. Ona Ruales, Lane C. Sander, Walter Brent Wilson, Stephen Wise
The relationship of reversed-phase liquid chromatography retention on a polymeric C18 stationary phase and the shape of polycyclic aromatic hydrocarbons (PAHs) was investigated for three-ring to seven-ring cata-condensed isomers. We report the first

Associations between perfluorinated alkyl acids measured in blood and ovarian follicular fluid and ovarian function in women undergoing assisted reproductive treatment

June 26, 2017
Author(s)
Jessica A. Cloy-McCoy, Jacqueline T. Bangma, Jessica L. Reiner, John Bowden, John Schnorr, Michael Slowey, Tom O'Leary, Louis J. Guillette, Benjamin B. Parrott
Endocrine disrupting contaminants, in combination with other environmental variables, are associated with altered reproductive health. Assisted reproductive technology (ART) procedures offer valuable opportunities to explore the connections between

SI traceable determination of arsenic species in kelp (Thallus laminariae)

June 26, 2017
Author(s)
Lee L. Yu, Rolf L. Zeisler, Rachel C. Stanoyevitch
Kelp is a dietary supplement that contains significant amount of arsenic. Accurate assessment of dietary safety of kelp requires the determination of the arsenic species therein. A procedure was developed to extract the hydrophilic fraction of arsenicals

Normal-phase liquid chromatography retention behavior of polycyclic aromatic hydrocarbon and their methyl-substituted derivatives on an aminopropyl stationary phase

June 16, 2017
Author(s)
Walter Wilson, Hugh Hayes, Lane Sander, Andres D. Campiglia, Stephen Wise
Retention indices for 124 polycyclic aromatic hydrocarbons (PAHs) and 62 methyl-substituted (Me-) PAHs were determined using normal-phase liquid chromatography (NPLC) on a aminopropyl (NH2) stationary phase. PAH retention behavior on the NH2 phase is

Metabolomics Analysis of Effects of Commercial Soy-based Protein Products in Red Drum (Sciaenops ocellatus)

June 14, 2017
Author(s)
Fabio Casu, Aaron Watson, Justin Yost, John Leffler, Gibson Gaylord, Frederic Barrows, Paul A. Sandifer, Dan Bearden, Michael R. Denson
In this study we investigated the metabolic effects of four different commercial soy-based protein products on red drum (Sciaenops ocellatus) using NMR-based metabolomics along with unsupervised principal component analysis (PCA) to evaluate metabolic

Partial Ionization Cross Sections of Organic Molecules

June 13, 2017
Author(s)
Karl K. Irikura
Partial ionization cross sections are the absolute yields of specific ions from an electron- molecule collision. They are necessary for modeling plasmas and for determining the sensitivity of mass spectrometers, among other applications. One mass
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