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Chemistry

Analytical chemistry

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Displaying 976 - 1000 of 2086

Certification of NIST SRM 2569 Lead Paint Films for Children's Products

October 15, 2012
Author(s)
John L. Molloy, John R. Sieber, Karen E. Murphy, Stephen E. Long, Stefan D. Leigh
SRM 2569 Lead Paint Films for Children’s Products is a new Standard Reference Material (SRM) developed for use primarily with XRF instrumentation. It consists of three paint coatings, with nominally 0 mg/kg, 90 mg/kg, and 300 mg/kg of Pb added, on

Biosynthesis of Athmu, a alpha,gamma-hydroxy-ss-amino acid of pahayokolides A-B

October 2, 2012
Author(s)
Li Liu, Dan Bearden, Juan C. Rodriguez, Kathleen S. Rein
Pahayokolides A-B are cyanobacteria derived non-ribosomal peptides which exhibit cytotoxicity against a number of cancer cell lines. The biosynthetic origin of the 3-amino-2,5,7,8- tetrahydroxy-10-methylundecanoic acid (Athmu) moiety has been investigated

Influence of mercury and selenium chemistries on the progression of cardiomyopathy in pygmy sperm whales, Kogia breviceps

October 1, 2012
Author(s)
Colleen E. Bryan Sallee, William C. Davis, Wayne E. McFee, Carola A. Neumann, Jennifer Schulte, Gregory D. Bossart, Steven J. Christopher
More than half of pygmy sperm whales (Kogia breviceps) that strand exhibit signs of cardiomyopathy (CMP). Many factors may contribute to the development of idiopathic CMP in K. breviceps, including genetics, infectious agents, contaminants, biotoxins, and

Controlling Thermochromism in a Photonic Block Copolymer Gel

September 26, 2012
Author(s)
Joseph J. Walish, Yin Fan , Andrea Centrone, Edwin L. Thomas
Controlling the color via temperature-induced changes of self-assembled photonic materials is important for their application in sensors and displays. The thermochromic behavior of a PS-P2VP photonic gel was studied (UV-VIS, FTIR) and found to originate

Expression and characterization of 15N-labeled human C-reactive protein in Escherichia coli and Pichia pastoris for use in isotope-dilution mass spectrometry

September 1, 2012
Author(s)
Eric L. Kilpatrick, Wei-Li Liao, Johanna Camara, Illarion V. Turko, David M. Bunk
Isotope dilution mass spectrometry using stable isotope labeled internal standards is unsurpassed in its ability to quantify analytes with accuracy and low measurement uncertainty. The extension of this technique to proteins relies upon the expression of

Measuring Single-Walled Carbon Nanotube Length Distributions from Diffusional Trajectories

August 27, 2012
Author(s)
Jason Streit, Sergei M. Bachilo, Anton V. Naumov, Constantine Y. Khripin, Ming Zheng, R B. Weisman
A new method is demonstrated for measuring the length distributions of dispersed single-walled carbon nanotube (SWCNT) samples by analyzing diffusional motions of many individual nanotubes in parallel. In this method, termed Length Analysis by Nanotube

Mass spectrometry quantification of clusterin in the human brain

August 20, 2012
Author(s)
Junjun J. Chen, Meiyao M. Wang, Illarion V. Turko
A multifunctional glycoprotein clusterin has been associated with late-onset Alzheimer’s disease (AD). This finding should prompt further investigation to define the role of clusterin in AD phenotypes. For that reason, the development of techniques to

Recommended vapor pressure and thermophysical data for ferrocene

August 14, 2012
Author(s)
Michal Fulem, Kvetoslav Ruzicka, Marisa A. Rocha, Luis M.N.B.F. Santos, Robert F. Berg
Recommended vapor pressure data for ferrocene (CAS Registry Number: 102-54-5) in the temperature range from 242 to 447 K were developed by the simultaneous correlation of critically assessed vapor pressures, heat capacities of the crystalline phase and the

Noble gas viscosities at 25 degrees C

August 10, 2012
Author(s)
Robert F. Berg, William C. Burton
Near 25 C, ab initio calculations of the zero-density viscosity of helium gas eta_He have an uncertainty of approximately 0.001 %, which is 1/40th of the uncertainty of the best measurements. The uncertainties of the published calculations for neon [Bich

Ionic Liquid Facilitated Introduction of Functional Materials into Biopolymer Polymer Substrates

August 2, 2012
Author(s)
Shonali Nazare, Jeffrey W. Gilman, Mauro Zammarano, Luke Haverhals, W.Matthew Reichert, Hugh De Long, Paul C. Trulove
In addition to being efficient solvents for biopolymers, several ionic liquids (ILs) have been shown to be effective solvents for synthetic polymers such as meta-aramids, i.e., Nomex ® (1-5). In this report, meta-aramid/cotton composites are generated by

SEABIRD TISSUE ARCHIVAL AND MONITORING PROJECT: Egg Collections and Analytical Results for 2006-2009

August 2, 2012
Author(s)
Stacy S. Schuur, Paul R. Becker, Sylvain Berail, Russell D. Day, Olivier F. Donard, Keith A. Hobson, Amanda J. Moors, Rebecca S. Pugh, Lauren B. Rust, David G. Roseneau
Since 1999, the Seabird Tissue Archival and Monitoring Project (STAMP) has collected, banked, and analyzed seabird eggs using established protocols to monitor chlorinated pesticides, polychlorinated biphenyls (PCBs), brominated flame retardants, and

Comparison of JP-8 and JP-8+100 with the Advanced Distillation Curve Approach

August 1, 2012
Author(s)
Thomas J. Bruno, Kathryn R. Abel, Jennifer Riggs
Additive packages are used with aviation kerosenes to achieve performance enhancements such as higher or lower operating temperatures or increased lubricity. An additive used to increase operating temperatures for heat sink applications is the +100

Solubility of Water in 1-Octanol from 2 degC to 96 degC

July 25, 2012
Author(s)
Brian E. Lang
The solubility of water in 1-octanol was measured from 2 °C to 96 °C by coulometric Karl Fischer titration. The mass fraction solubility at 25 ° was found to be (48.91 ± 0.13) mg/g. Experiments also indicated the existence of a pseudo-equilibrium state
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