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Displaying 701 - 725 of 1845

Purity determination as needed for the realisation of primary standards for elemental determination - status of international comparability

July 9, 2009
Author(s)
Gregory C. Turk, Heinrich Kipphardt, Ralf Matschat, Jochen Vogl, Tamara Gusarova, Michael Czerwensky, Hans-Joachim Heinrich, Akiharu Hioki, Leonid A. Konopelko, Brad Methven, Tsutomu Miura, Ole Petersen, Gundel Riebe, Ralph Sturgeon, Lee L. Yu
Within the National Metrology Institutes (NMIs) and designated laboratories, an interlaboratory comparison, CCQM-P107, was conducted to verify the degree of international comparability concerning the results of purity analysis. The mass fractions of Ag, Bi

A Volcano Curve: Optimizing Methanol Electro-oxidation on Pt decorated Ru Nanoparticles

June 26, 2009
Author(s)
Christopher D. Zangmeister, Savelas A. Rabb, Du Bingchen, YuYe Tong
Controlled Pt adlayers were deposited on commercial Ru nanoparticles (NPs) using an industrially scalable one-pot ethylene glycol (EG) reduction based method and were characterized by X-ray diffraction (XRD), electrochemical (EC) CO stripping voltammetry

Comparison of Clinical Methods with Isotope Dilution ICP-MS for the New Standard Reference Material 955c Lead In Caprine Blood

May 26, 2009
Author(s)
Karen E. Murphy, Thomas W. Vetter, Gregory C. Turk, Christopher D. Palmer, Miles E. Lewis, Ciaran M. Geraghty, Patrick J. Parsons, William F. Guthrie
The National Institute of Standards and Technology (NIST) has developed Standard Reference Material (SRM) 955c, a new caprine-based, four-level blood standard with certified blood lead levels (BLLs) ranging from 0.4 µg/dL (0.02 µmol/L) Pb to 45 µg/dL (2.17

Potential Primary Measurement Tool for the Quantification of DNA

May 1, 2009
Author(s)
Ryan G. Brennan, Savelas A. Rabb, Marcia J. Holden, Michael R. Winchester
An automated sample introduction system, utilizing a demountable direct injection high efficiency nebulizer (d DIHEN), is successfully incorporated for the first time with an inductively coupled plasma optical emission spectrometer (ICP-OES) for the

Study of Azeotropic Mixtures with the Advanced Distillation Curve Approach

April 11, 2009
Author(s)
Amelia Hadler, Lisa S. Ott, Thomas J. Bruno
Classical methods for the study of complex fluid phase behavior include static and dynamic equilibrium cells that usually require vapor and liquid recirculation. These are sophisticated, costly apparatus that require highly trained operators, usually

T7-Based Linear Amplification of Low Concentration mRNA Samples using Beads and Microfluidics for Global Gene Expression Measurements

April 7, 2009
Author(s)
Jason G. Kralj, Audrey Player, Hope Sedrick, Matt S. Munson, David Petersen, Samuel P. Forry, Paul Meltzer, Ernest Kawasaki, Laurie E. Locascio
We show single-cell level linear amplification of gene expression libraries immobilized on a microfluidic packed bed. This is a critical step in the Eberwine process, which is used to amplify messenger RNA (mRNA) for gene expression profiling. Microarray

Evaluation of Oral Fluid Testing Devices

April 1, 2009
Author(s)
Lorna T. Sniegoski, Jocelyn L. Prendergast, Michael J. Welch, Alim A. Fatah, M Gackstetter, R. Q. Thompson
Several point-of-collection (POC) devices for detection of drugs of abuse in oral fluid were studied. The ability of the devices to meet the manufacturers' claims and their practical application to detection of drugs of abuse at low concentrations in oral

Polymerization Stress Development in Dental Composites: Effect of Cavity Design Factor

March 13, 2009
Author(s)
Joseph M. Antonucci, Anthony A. Giuseppetti, Justin N. O'Donnell, Gary E. Schumacher, Drago Skrtic
Objective: To assess the effect of the cavity design factor (C-factor) on polymerization stress development (PSD) in resin composites. Methods: An experimental resin (BT resin) was prepared, which contained 2,2-bis[p-(2 hydroxy-3 -methacryloxypropoxy

SEABIRD TISSUE ARCHIVAL AND MONITORING PROJECT: Egg Collections and Analytical Results for 2002-2005

February 5, 2009
Author(s)
Stacy S. Schuur, Paul R. Becker, Russell D. Day, Michael B. Ellisor, Aurore Guichard, Amanda J. Moors, David Point, Rebecca S. Pugh, David G. Roseneau
The Seabird Tissue Archival and Monitoring Project (STAMP) has continued to collect and bank murre and gull eggs to obtain new information on chlorinated pesticides, polychlorinated biphenyls (PCBs), brominated flame retardants, mercury, and organotin

Thermal Decomposition Kinetics of Propylcyclohexane

January 21, 2009
Author(s)
Jason A. Widegren, Thomas J. Bruno
As part of a large-scale thermophysical property measurement project, the decomposition kinetics of propylcyclohexane was investigated. Decomposition reactions were performed at 375, 400, 425, and 450 °C in stainless steel ampoule reactors. At each

Striped Domains at the Pentacene:C 60 Interface

January 12, 2009
Author(s)
Dan B. Dougherty, W Jin, J Cullen, J Reutt-Robey, Steven W. Robey
STM observations of the initial growth stages of the first layer of pentacene on a monolayer film of C60 on Ag(111) are presented. Pentacene films nucleate and grow with molecules standing up at the Pentacene:C60 interface similar to the well known thin
Displaying 701 - 725 of 1845