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Displaying 701 - 725 of 1931

The Roles of the Mise en Pratique for the Definition of the Kelvin

October 16, 2010
Author(s)
Dean C. Ripple, Richard Davis, Bernd Fellmuth, Joachim Fischer, Graham Machin, Terry Quinn, Peter Steur, Osamu Tamura, David R. White
The mise en pratique (“practical realization”) for the definition of the kelvin (MeP-K) was created by the Consultative Committee for Thermometry (CCT) in 2006 to give practitioners of thermometry a guide to the realization of the kelvin, in accord with

Bilateral Comparison Confirms NIMs and NISTs Gas Flow Capabilities

October 15, 2010
Author(s)
Aaron N. Johnson, CHUNHUI LI
The bilateral comparison between NIM and NIST for gas flow was conducted from June 2008 to October 2009. Two critical flow venturis (CFVs) with nominal throat diameters of 10 mm and 20 mm, respectively, were selected as transfer standards. The CFVs were

Properties for Accurate Gas Flow Measurements

October 15, 2010
Author(s)
John D. Wright
Accurate gas properties are needed to take full advantage of the low uncertainties provided by NIST’s Gas Flow Calibration Services. If a flowmeter user and NIST use different values for these properties (molecular mass, compressibility, density, viscosity

Chromatographic Methods for the Quantification of Free and Chelated Gadolinium Species in MRI Contrast Agent Formulations

October 3, 2010
Author(s)
Danielle Cleveland, Stephen E. Long, Lane C. Sander, William C. Davis, Karen E. Murphy, Catherine A. Rimmer, Lorena Francini, Anil K. Patri
Speciation measurements of gadolinium in liposomal MRI contrast agents are complicated by the presence of emulsifiers, surfactants, and therapeutic agents in the formulations. The present paper describes two robust, hyphenated chromatography methods for

Thermochemistry of Imidazolium-Based Ionic Liquids:Experiment and First-Principles Calculations

September 16, 2010
Author(s)
Chris D. Muzny, Sergey P. Verevkin, Vladimir N. Emel'yanenko, Dzmitry H. Zaitsau, Andreas Heintz, Michael D. Frenkel
In this work the molar enthalpy of formation of the ionic liquid ethyl-methylimidazolium dicyanoamide in the gaseous phase [C2MIM][N(CN)2] was measured by means of combustion calorimetry and enthalpy of vaporization using transpiration. Available scarce

BioPAX A Community Standard for Pathway Data Sharing

September 9, 2010
Author(s)
Robert N. Goldberg, Michael Cary, Erek Demir
BioPAX (Biological Pathway Exchange) is a standard language to represent biological pathways and processes at the molecular and cellular level. Its major use is to facilitate the exchange of pathway data (http://www.biopax.org). Pathway data captures our

Scientific Issues with Analysis of Low Amounts of DNA

September 7, 2010
Author(s)
John Butler, Becky Steffen
Faced with limited evidence that yield low amounts of DNA, forensic analysts will continually have to confront the question of how far to push DNA testing techniques. Low copy number (LCN) analysis, also known as low template DNA (LT-DNA) testing, involves

Synthesis and Electronic Properties of the Misfit Layered Compound [(PbSe)1.00]1[MoSe2]1

September 1, 2010
Author(s)
Ian M. Anderson, Michael D. Anderson, Andrew A. Herzing, Colby Heideman, Raimar Rostek, David C. Johnson
An ultra-low thermal conductivity compound with the ideal formula [(PbSe)1.00]1[MoSe2]1 has been successfully crystallized across a range of compositions. The lattice parameters varied from 12.41 Å to 12.75 Å and the quality of the observed 00ℓ diffraction

Translational Considerations for Cancer Nanomedicine

September 1, 2010
Author(s)
Stephen T. Stern, Jennifer B. Hall, Lee L. Yu, Laura J. Wood, Giulio F. Paciotti, Lawrence Tamarkin, Stephen E. Long, Scott E. McNeil
There are many important considerations during preclinical development of cancer nanomedicines, including: 1) unique aspects of animal study design; 2) the difficulties in evaluating biological potency, especially for complex formulations; 3) the

Design Considerations for Proteomic Reference Materials

August 25, 2010
Author(s)
David M. Bunk
In order to improve the repeatability, comparability, and accuracy of proteomic measurements, there has been considerable international effort to develop appropriate reference materials. While the majority of reference materials are developed to support

Production and Characterization of Polymer Microspheres Containing Trace Explosives Using Precision Particle Fabrication Technology

August 2, 2010
Author(s)
Matthew E. Staymates, Robert A. Fletcher, Jessica L. Staymates, John G. Gillen, Cory Berkland
Well characterized test materials are essential for validating the performance of current trace explosive detection systems. These test materials must replicate trace explosive contamination in the form of small particles with characteristic diameters in

Standard Photoacoustic Spectrometer: Model and Validation using O2 A-Band Spectra

June 30, 2010
Author(s)
Keith A. Gillis, Daniel K. Havey, Joseph T. Hodges
We model and measure the absolute response of an intensity-modulated photoacoustic spectrometer comprising a 10 cm long resonator and having a Q-factor of approximately 30. We present a detailed theoretical analysis of the system and predict its response
Displaying 701 - 725 of 1931
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