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Displaying 1901 - 1925 of 4041

Structure and stability of hydrated ss-MnO2 surfaces

May 9, 2012
Author(s)
Gloria A. Oxford, Anne M. Chaka
Hydration of the β-MnO2 (110), (100), and (101) surfaces is investigated using a combination of periodic density functional theory and ab initio thermodynamics. Fully hydrated surfaces are found to be significantly more stable than the stoichiometric ones

A Proteomics Performance Standard to Support Measurement Quality in Proteomics

April 21, 2012
Author(s)
Ashley B. Green, David M. Bunk, Paul A. Rudnick, Karen W. Phinney, Lisa E. Kilpatrick
The emergence of mass spectrometry-based proteomic platforms as a prominent technology utilized in biochemical and biomedical research has increased the need for high-quality MS measurements. To address this need, NIST Reference Material (RM) 8323 Yeast

Mercury Stable Isotopes in Seabird Eggs Reflect a Gradient from Terrestrial Geogenic to Oceanic Mercury Reservoirs

April 21, 2012
Author(s)
Russell D. Day, David G. Roseneau, Sylvain Berail, Keith A. Hobson, O.F.X Donard, Stacy S. Schuur, Rebecca S. Pugh, Amanda J. Moors, Stephen E. Long, Paul R. Becker
Elevated mercury concentrations ([Hg]) were found in Alaskan seabird eggs (Uria spp.) from the coastal embayment of Norton Sound relative to insular colonies in the northern Bering Sea. Stable isotopes of Hg, carbon (C), and nitrogen (N) were measured in

Nanoscale Fullerene Compression of an Yttrium Carbide Cluster

April 13, 2012
Author(s)
Jianyuan Zhang, Fuhrer Tim, Wujun Fu, Jiechao Ge, Dan Bearden, Jerry Dallas, Duchamp James, Kenneth Walker, Hunter Champion, Hugo Azurmendi, Kim Harich, Harry C. Dorn
The encapsulation of clusters (or small molecules) in spheroidal fullerene cages provides a unique isolated environment that is important in describing their shape, dynamics, and physical properties. For the case of yttrium carbide clusters, we find that

Carbon Storage Properties of OMS-2 Manganese Oxide

April 10, 2012
Author(s)
Lan (. Li, Eric J. Cockayne, Laura Espinal, Winnie K. Wong-Ng
Manganese oxide OMS-2 material, also known as alpha-MnO2, exhibits CO2 sorption hysteresis at pressures > 7 bar. Our experiments show that the hysteretic behavior strongly depends on time, temperature and pressure. To understand the atomic structures and

Time dependent CO2 sorption hysteresis in a one-dimensional microporous octahedral molecular sieve

April 6, 2012
Author(s)
Laura Espinal, Winnie K. Wong-Ng, Andrew J. Allen, Daniel W. Siderius, Chad R. Snyder, Eric J. Cockayne, Lan (. Li, James A. Kaduk, Anais E. Espinal, Steven L. Suib, Chun Chiu
A critical challenge in the development of novel carbon capture materials with engineered porous architectures is to understand and control the phenomenon of sorption hysteresis, whereby the path to adsorption of gas molecules by the porous host differs

Determination of Perfluorinated Alkyl Acid Concentrations in Biological Standard Reference Materials

April 4, 2012
Author(s)
Jessica L. Reiner, Jennifer M. Lynch, Michele M. Schantz, Steven O'Connell, Craig M. Butt, Scott Mabury, Jeff Small, Amila De Silva, Derek Muir, Amy D. Delinsky, Mark J. Strynar, Andrew B. Lindstrom, William K. Reagen, Michelle Malinsky, Sandra Schafer, Christiaan Kwadijk
Standard Reference Materials (SRMs) are homogeneous, well-characterized materials that are used to validate measurements and improve the quality of analytical data. The National Institute of Standards and Technology (NIST) has a wide range of SRMs that
Displaying 1901 - 1925 of 4041
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