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Displaying 676 - 700 of 1931

Quantification and Compensation of Unintentional Analyte Aggregation in Electrospray Sampling

March 30, 2011
Author(s)
Mingdong M. Li, Suvajyoti S. Guha, Rebecca A. Zangmeister, Michael J. Tarlov, Michael R. Zachariah
Electrospray (ES) sources are commonly used to introduce non-volatile materials (e.g. nanoparticles, proteins, etc.) in to the gas phase for characterization by mass spectrometry and ion mobility. Recent studies in our group using electrospray ion mobility

A Human Urine Standard Reference Materials for Accurate Assessment of Arsenic Exposure

March 17, 2011
Author(s)
Lee L. Yu, Carl Verdon, William C. Davis, Gregory C. Turk, Kathleen Caldwell, Robert Jones, Brian Buckley, Ruimin Xie
Arsenic is a toxic element, and the toxicity of the element is dependent upon the molecular form it is in. Accurate assessments of arsenic exposure require the measurement of a complete panel of inorganic, organic, and metabolite As species in urine

High Accuracy Measurements of OH Reaction Rate Constants and IR and UV Absorption Spectra: Ethanol and Partially Fluorinated Ethyl Alcohols.

March 4, 2011
Author(s)
Vladimir L. Orkin, Victor Khamaganov, Larissa E. Martynova, Michael J. Kurylo III
Rate constants for the gas phase reactions of OH radicals with ethanol and three fluorinated ethyl alcohols, CH3CH2OH (k0), CH2FCH2OH (k1), CHF2CH2OH (k2), and CF3CH2OH (k3) were measured using a flash photolysis resonance-fluorescence technique over the

Rate Constants for the Reactions between OH and Perfluorinated Alkenes

February 20, 2011
Author(s)
Vladimir L. Orkin, Gregory A. Poskrebyshev, Michael J. Kurylo III
The rate constants for the reactions of OH radicals with fully fluorinated alkenes containing different number of –CF3 groups next to olefinic carbon, CF2=CF2, CF2=CFCF3, CF3CF=CFCF3, (CF3)2C=CFC2F5 were measured using the flash photolysis resonance

Nanomaterial Toxicity: Emerging Standards and Efforts to Support Standards Development

February 1, 2011
Author(s)
Laurie E. Locascio, Vytautas Reipa, Justin M. Zook, Richard C. Pleus
For the first time in the history of industrialization, nanotechnology offers the unique opportunity to consider material safety ahead of its full implementation. Many scientists around the world have been motivated by this and are working on developing

Present Estimates of the Differences Between Thermodynamic Temperatures and the ITS-90

January 29, 2011
Author(s)
Joachim Fischer, M. DePodesta, K. D. Hill, Michael R. Moldover, Laurent Pitre, R. Rusby, Peter Steur, Osamu Tamura, R. White, L. Wolber
In 2005, the Consultative Committee for Thermometry (CCT) recommended the creation of a Mise en pratique for the definition of the kelvin and envisioned that future versions of the Mise en pratique would recommend values of the differences between

Influence of substrate on crystallization in polythiophene/fullerene blends

January 13, 2011
Author(s)
Lee J. Richter, Christine He, David Germack, R Joseph Kline, Dean DeLongchamp, Daniel A. Fischer, Chad R. Snyder, James G. Kushmerick
The nanoscale morphology of the active layer in organic, bulk heterojunction (BHJ) solar cells is crucial to device performance. Often a combination of casting conditions and post deposition thermal treatment are used to optimize the morphology. In general

Variables in the Quantification of CD4 in Normals and Hairy Cell Leukemia Patients

January 3, 2011
Author(s)
Gerald E. Marti, William G. Stetler-Stevenson, Fatima Abbasi, Gregory A. Jasper, Robert J. Kreitman, Lili Wang
Background: Quantitative flow cytometry (QFCM) is being applied in the clinical flow cytometry laboratory. Quantitative normal T-cell CD4 expression represents a biologic standard and quality control agent. However, Low levels of CD4 expression were

Measurement of Nanoparticle Concentration Using Quartz Crystal Microgravimetry

December 16, 2010
Author(s)
Vytautas Reipa, Geoffrey Purdum, Jonghoon Choi
A common issue, encountered in nanoparticle-biological system interaction studies is accurate nanoparticle concentration expression, given the critical importance of the dose-response relationships. We present here the application of quartz crystal

Ordered metal nanostructure self-assembly using metal-organic frameworks as templates

December 13, 2010
Author(s)
Benjamin Jacobs, Houk Ronald, Stephen House, Ian Robertson, Albert A. Talin, Mark Allendorf, Mitchell Anstey
Synthesis of metal nanoparticles and nanowires with controlled size and aspect ratio is well developed,1-4 but the creation of ordered nanostructures comprising these is much more challenging, presenting a barrier to further development of electronic and

Microstructure and hydrogen bonding in water-acetonitrile mixtures

November 19, 2010
Author(s)
Raymond D. Mountain
The connection between hydrogen bonding between water and acetonitrile in determining the microheterogeneity of the liquid mixture is examined using NPT molecular dynamics simulations. Mixtures for six, rigid, three-site models for acetonitrile and one

Novel Reduced Pressure-Balance Syringe for Chromatographic Analysis

November 19, 2010
Author(s)
Bret Windom, Thomas J. Bruno
When withdrawing a fluid sample from an apparatus at reduced pressures for additional chromatographic analyses, a gas tight plunger syringe proves ineffective as it does not create a substantial pressure differential to pull a fluid from a reduced pressure

Association of Quantum dot nanoparticles with Pseudomonas aeruginosa biofilm

November 1, 2010
Author(s)
Jayne B. Morrow, Catalina Arango, Richard D. Holbrook
Quantum dots (QDs) of two different surface chemistries (carboxyl (COOH) and poly ethylene glycol (PEG) modified) were utilized to determine the impact of surface functionality on QD mobility and distribution in Pseudomonas aeruginosa PAO1 biofilms

Development of a Candidate Secondary Reference Procedure (immunoassay based measurement procedure of higher metrological order) for Cardiac Troponin I: I. Antibody Characterization and Preliminary Validation

November 1, 2010
Author(s)
James E. Noble, David M. Bunk, R. H. Christenson, Kenneth D. Cole, Hua-Jun He, Alexei Katrukha, Mauro Panteghini, Robert Porter, Heinz Schimmel, Jillian Tate, Lili Wang
The development of a reference measurement procedure to support the cardiac troponin I (cTnI) standardization initiative is described. The reference measurement procedure will be used to assign reference values to serum-based secondary standards. A
Displaying 676 - 700 of 1931
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