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Standards

Reference materials

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Displaying 176 - 200 of 546

Harmonization of LC-MS/MS protein assays

September 24, 2018
Author(s)
Alan L. Rockwood, Mark Lowenthal, Cory Bystrom
Harmonization of diagnostic test results is fundamental to the effective use of laboratory testing in the diagnosis, treatment and monitoring of disease. Formal approaches to harmonization and standardization provide a rigorous and high quality Roadmap to

Atom Probe Tomography Analysis of the Reference Zircon GJ-1: A Round-Robin Experiment

September 20, 2018
Author(s)
Ann C. Chiaramonti Debay, Paul T. Blanchard, Alexandre La Fontaine, Florent Exertier, Sandra Piazolo, Elena Belousova, Zirong Peng, Baptiste Gault, David W. Saxey, Denis Fougerouse, Steven Reddy, Julie Cairney
In recent years, atom probe tomography (APT) has been increasingly used to study minerals, and in particular Zircons. The mineral Zircon (ZrSiO4) is ideally suited for geochronology by utilising the U-Th-Pb isotope systems, and trace element compositions

Conference Report: Representing Ethnic Diversity for Precision Medicine

August 23, 2018
Author(s)
Justin M. Zook, Luke Hickey, Benedict Paten, Robert Sebra, Valerie Schneider
There is a pressing need to better represent ethnic diversity with genomic resources — and to do so in a way that maximizes utility for people working with the Genome Reference Consortium’s human reference genome. That was the theme of a panel discussion

A Reference Material for Evaluation of Cs-137 Radiochronometric Measurements

August 16, 2018
Author(s)
Kevin B. Lavelle, Richard Essex, Jeffrey T. Cessna, Kevin P. Carney, Cole R. Hexel
A new nuclear forensic reference material has been characterized as a standard for radiochronometric determination of the model purification date for 137Cs sources. The purification date of a radioactive source is a potentially diagnostic nuclear forensic

A new realization of SI for organic chemical measurement: NIST PS1 Primary Standard for quantitative NMR (Benzoic Acid)

July 30, 2018
Author(s)
Michael A. Nelson, Jason F. Waters, Blaza Toman, Brian E. Lang, Alexander R?ck, Kathrin Breitruck, Markus Obkircher, Anthony Windust, Katrice A. Lippa
Metrological traceability to common references supports the comparability of chemical measurement results produced by different analysts, at various times, and at separate places. Ideally, these references are realizations of base units of the

Certification of Standard Reference Material 1879b Respirable Cristobalite

July 27, 2018
Author(s)
David R. Black, Marcus H. Mendenhall, Pamela S. Whitfield, Craig Brown, Albert Henins, James J. Filliben, James P. Cline
The National Institute of Standards and Technology (NIST) certifies a suite of Standard Reference Materials (SRMs) to address specific aspects of the performance of X-ray powder diffraction instruments. This report describes SRM 1879b, the third generation

Subnanometer localization accuracy in widefield optical microscopy

July 11, 2018
Author(s)
Craig R. Copeland, Jon C. Geist, Craig D. McGray, Vladimir A. Aksyuk, James A. Liddle, Bojan R. Ilic, Samuel M. Stavis
The common assumption that precision is the limit of accuracy in localization microscopy and the typical absence of comprehensive calibration of optical microscopes lead to a widespread issue - overconfidence in measurement results with nanoscale

Measuring Ion-Pairing in Buffer Solutions with Microwave Microfluidics

June 14, 2018
Author(s)
Angela C. Stelson, Charles A. Little, Nathan D. Orloff, Christian J. Long, James C. Booth
Microwave microfluidics is an emergent technique for characterizing conductivity and permittivity of fluids and has wide-ranging applications in the materials science and biomedical fields. The electrical properties of fluids as a function of frequency can

Metrology for stable isotope reference materials: 13C/12C and 18O/16O isotope ratio value assignment of pure carbon dioxide gas samples on the Vienna PeeDee Belmnite-CO2 scale using dual-inlet mass spectrometry

May 25, 2018
Author(s)
Abneesh Srivastava, R M. Verkouteren
Isotope ratio measurements have been conducted on a series of isotopically distinct pure CO2 gas samples using the technique of dual-inlet isotope ratio mass spectrometry (DI-IRMS). The influence of instrumental parameters, data normalization schemes on

Qualitative characterization of three combustion-related standard reference materials for polycyclic aromatic sulfur heterocycles and their alkyl-substituted derivatives via gas chromatography/mass spectrometry

May 7, 2018
Author(s)
Walter Wilson, Hugh Hayes, Andres Campiglia, Stephen Wise
This study represents the most comprehensive qualitative characterization of three combustion- related standard reference materials (SRMs) for polycyclic aromatic sulfur heterocycles (PASHs) and some alkyl-substituted (alkyl-) derivatives to date: SRM

Method for Determining the Electrical Shape of a Scanning Probe Microscope Tip

April 2, 2018
Author(s)
Joseph J. Kopanski, Malcolm Regan, Lin You
Knowledge of the actual electrical tip shape can be used to better understand electric field gradients measured with eSPMs and to determine the suitability of various types of conducting SPM tips for electrical measurements. For co-axially shielded tips

Addressing Quality Assurance Issues in 3D Firearm and Toolmark Imaging

April 1, 2018
Author(s)
Michael T. Stocker, Robert M. Thompson, Johannes A. Soons, Thomas B. Renegar, Xiaoyu A. Zheng
The emerging capability for measuring and analyzing the three-dimensional (3D) surface topography of forensic samples is expected to have a profound impact on firearm and toolmark identification. As forensic laboratories are working to integrate 3D

Certification of Standard Reference Material(R) 2372a Human DNA Quantitation Standard

March 19, 2018
Author(s)
Erica L. Romsos, Margaret C. Kline, Natalia Farkas, David L. Duewer, Blaza Toman
Standard Reference Material (SRM) 2372a is intended for use in the value assignment of human genomic deoxyribonucleic acid (DNA) forensic quantitation materials. A unit of SRM 2372a consists of three well-characterized human genomic DNA materials

NIST Standards for Measurement, Instrument Calibration, and Quantification of Gaseous Atmospheric Species

March 2, 2018
Author(s)
George C. Rhoderick, Michael E. Kelley, Walter R. Miller Jr., James E. Norris, Jennifer Carney, Lyn Gameson, Christina Cecelski, Cassie Goodman, Abneesh Srivastava, Joseph Hodges
There are many gas species present in the atmosphere that are associated with the earth's climate. These compounds absorb and emit radiation, a process which is the fundamental cause of the greenhouse effect. The major greenhouse gases in the earth's

The NISTmAb Reference Material 8671 Value Assignment, Homogeneity, and Stability

March 1, 2018
Author(s)
John E. Schiel, Abigail Turner, Catherine A. Mouchahoir, Katharina S. Yandrofski, Srivalli Telikepalli, Jason King, Paul C. DeRose, Dean C. Ripple, Karen W. Phinney
The NISTmAb Reference Material (RM) 8671 is intended to be the common industry standard monoclonal antibody for pre-competitive research in harmonizing current state-of-the-art technology and designing next generation characterization technologies for

Protein Adsorption and Layer Formation at the Stainless Steel - Solution Interface Mediates Shear-Induced Particle Formation for an IgG1 Monoclonal Antibody

February 9, 2018
Author(s)
Cavan K. Kalonia, Frank Heinrich, Joseph E. Curtis, Sid Raman, Maria A. Miller, Steven Hudson
Passage of specific protein solutions through certain pumps, tubing, and/or filling nozzles can result in the production of unwanted subvisible protein particles (SVP). In this work, surface mediated SVP formation was investigated. Specifically, the

Correction of an adding-doubling inversion algorithm for the measurement of the optical parameters of turbid media

January 1, 2018
Author(s)
Paul Lemaillet, Catherine C. Cooksey, Jeeseong Hwang, Heidrun Wabnitz, Dirk Grosenick, Lin Yang, David W. Allen
We present broadband measurements of the optical properties of tissue-mimicking solid phantoms using a single integrating sphere to measure the hemispherical reflectance and transmittance under a direct illumination at the normal incident angle. These
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