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Displaying 76 - 100 of 525

Health Assessment Measurements Quality Assurance Program: Exercise 6 Final Report

September 20, 2021
Author(s)
Chuck Barber, Carolyn Burdette, Hugh Hayes, Monique Johnson, Shaun Kotoski, Jacolin Murray, Melissa M. Phillips, Kate Rimmer, Laura J. Wood, Andrea Yarberry
The Health Assessment Measurements Quality Assurance Program (HAMQAP) was launched in collaboration with the National Institutes of Health (NIH) Office of Dietary Supplements (ODS) in 2017. HAMQAP was established to enable laboratories to improve the

Assessing the Microscale Heterogeneity in Candidate Standard Reference Material 4600: Surrogate Post-detonation Urban Debris

August 18, 2021
Author(s)
Jacqueline L. Mann, John L. Molloy, Mark Tyra, Kevin Pfeuffer, Barbara Fallon, JoAnn Buscaglia
Nondestructive microbeam X-ray fluorescence (µXRF) spectrometry has been used to investigate the elemental microheterogeneity in a candidate nuclear forensics reference material (RM), NIST SRM 4600: Surrogate Post-detonation Urban Debris. Using a principal

Challenges of Accuracy in Germline Clinical Sequencing Data

July 20, 2021
Author(s)
Justin Zook, Ryan Poplin, Mark DePristo
Physicians are increasingly using clinical sequencing tests to establish diagnoses of patients who might have genetic disorders, which means that accuracy of sequencing and interpretation are important elements in ensuring the benefits of genetic testing

Reference standards for accurate validation and optimization of assays that determine integrated Lentiviral vector copy number in transduced cells

July 11, 2021
Author(s)
Barbara S. Paugh, Lajos Baranyi, Andre Roy, Hua-Jun He, Lindsay Harris, Kenneth Cole, Caroline Raimund, Patricia S. Langan, Moria Artlip, Srikanta Jana, Rimas J. Orentas, Sheng Lin-Gibson, Winfried Krueger, Boro Dropuli?
Lentiviral vectors (LV) have emerged as a robust technology for therapeutic gene delivery into human cells as advanced medicinal products. As these products are increasingly commercialized, there are concomitant demands for their characterization to ensure

Reference Materials for Phase Equilibrium Studies. 1. Liquid-Liquid Equilibria (IUPAC Technical Report)

July 8, 2021
Author(s)
Ala Bazyleva, William E. Acree, Jr., Robert D. Chirico, Vladimir Diky, Glenn T. Hefter, Johan Jacquemin, Joe W. Magee, John P. O'Connell, James D. Olson, Ilya Polishuk, Kurt Schmidt, John M. Shaw, J. P. M. Trusler, Ronald D. Weir
This article is the first of three projected IUPAC Technical Reports resulting from IUPAC Project 2011-037-2-100 (Reference Materials for Phase Equilibrium Studies). The goal of that project was to select reference systems with critically evaluated

Assessment of Serum Total 25 Hydroxyvitamin D Assay Commutability of Standard Reference Materials and College of American Pathologists Accuracy Based Vitamin D (ABVD) Scheme and Vitamin D External Quality Assessment Scheme (DEQAS) Materials: Vitamin D Sta

July 1, 2021
Author(s)
Johanna Camara, Stephen A. Wise, Andrew Hoofnagle, Emma L. Williams, Graham D. Carter, Julia C. Jones, Carolyn Burdette, Grace Hahm, Federica Nalin, Adam J. Kuszak, Joyce M. Merkel, Ramon Durazo-Arvizu, Pierre Lukas, E. Cavalier, Christian Popp, Christian Beckert, Jan Schultess, Glen Van Slooten, Carole Tourneur, Camille Pease, Ravi Kaul, Alfredo Villarreal, Fiona Ivison, Ralf Fischer, Jody M. van den Ouweland, Chung S. Ho, Emmett W. Law, Jean-Nicolas Simard, Renaud Gonthier, Brett Holmquist, Marcelo C. Batista, Heather Pham, Alex Bennett, Sarah Meadows, Lorna Cox, Eugene Jansen, Dilshad A. Khan, Kimberly Robyak, Michael H. Creer, Mark Kilbane, Patrick J. Twomey, James Freeman, Neil Parker, Jinyun Yuan, Robert Fitzgerald, Sohail Mushtaq, Michael W. Clarke, Norma Breen, Christine Simpson, Christopher T. Sempos
An interlaboratory study was conducted through the Vitamin D Standardization Program (VDSP) to assess commutability of Standard Reference Materials® (SRMs) and proficiency testing/external quality assessment (PT/EQA) samples for determination of serum

Polarization Effects of X-ray Monochromators Modeled Using Dynamical Scattering Theory

July 1, 2021
Author(s)
Marcus Mendenhall, David R. Black, Donald Windover, James Cline
The difference in the diffracted intensity of the sigma-and pi-polarized components of an X-ray beam in powder diffraction has generally been treated according to equations based on dipole scattering, also known as kinematic X-ray scattering. Although this

Dynamic light scattering distributions by any means

May 21, 2021
Author(s)
Natalia Farkas, John A. Kramar
Dynamic light scattering (DLS) is an essential technique for nanoparticle size analysis and has been employed extensively for decades, but despite its long history and popularity, the choice of weighting and mean of the size distribution often appears to

A Highly-enriched 244Pu Reference Material for Nuclear Safeguards and Nuclear Forensic Measurements

January 26, 2021
Author(s)
Richard Essex, Ross W. Williams, Kerri C. Treinen, Amelie Hubert, Marc A. Humphrey, Jeremy D. Inglis, William S. Kinman, Joel Maassen, Maxim V. Penkin, Robert E. Steiner
A highly-enriched 244Pu isotope dilution reference material has been prepared and characterized for metrologically traceable measurements of very small quantities of plutonium. The amount of plutonium in samples associated with nuclear safeguards and

A new highly enriched 233U reference material for improved simultaneous determination of uranium amount and isotope amount ratios in trace level samples

January 26, 2021
Author(s)
Richard Essex, Ross W. Williams, Kayron T. Rogers, Cole R. Hexel, Tashi Parsons-Davis, Kerri C. Treinen
A highly-enriched 233U reference material (>0.99987 n(233U)/n(U)) has been prepared and characterized for use as an isotope dilution mass spectrometry spike. An ion exchange separation was performed on 1 gram of high purity 233U to further reduce trace

Certification of Standard Reference Material(R) 1992 / ERM(R)-FD305 Zeta Potential - Colloidal Silica (Nominal Mass Fraction 0.15 %)

November 24, 2020
Author(s)
Yannic Ramaye, Vikram Kestens, J. Charoud-Got, S. Mazoua, G. Auclair, Tae Joon Cho, Blaza Toman, Vincent A. Hackley, T. Linsinger
This report describes the production of SRM 1992/ERM-FD305, silica particles suspended in a borate buffer, certified for electrophoretic mobility and zeta potential by electrophoretic light scattering (ELS). This material was produced following ISO 17034

Certification of Standard Reference Material(R) 1993 / ERM(R)-FD306 Zeta Potential - Colloidal Silica (Nominal Mass Fraction 2.2 %)

November 24, 2020
Author(s)
Yannic Ramaye, Vikram Kestens, J. Charoud-Got, S. Mazoua, G. Auclair, Tae Joon Cho, Blaza Toman, Vincent A. Hackley, T. Linsinger
This report describes the production of SRM 1993/ERM-FD306, silica particles suspended in a borate buffer, certified for electrophoretic mobility and zeta potential by electrophoretic light scattering (ELS). This material was produced following ISO 17034

Lessons From the NIST Micronutrients Quality Assurance Program for Vitamin C, 1993 to 2015: Sample Stability, Assay Reproducibility, and Use of Controls to Improve Comparability

November 11, 2020
Author(s)
David L. Duewer, Jeanice M. Brown Thomas, Katherine E. Sharpless, S A. Margolis
Vitamin C is a necessary micronutrient that is involved in many biological processes. In preserved human plasma and serum, vitamin C is most meaningfully analyzed as total ascorbic acid (TAA). From 1993 through 2015, the National Institute of Standards and

The certification of electrophoretic mobility/zeta potential of silica particles in aqueous solution: ERM-FD305/SRM 1992

October 27, 2020
Author(s)
Y. Ramaye, V. Kestens, J. Charoud-Got, S. Mazoua, G. Auclair, Tae Joon Cho, Blaza Toman, Vincent A. Hackley, T. Linsinger
This report describes the production of ERM-FD305/SRM 1992, silica nanoparticles suspended in a borate buffer, certified for electrophoretic mobility and zeta potential measurements by electrophoretic light scattering (ELS). This material was produced

Development of a pregnancy-specific reference material for thyroid biomarkers, vitamin D, and nutritional trace elements in serum

October 24, 2020
Author(s)
Ashley Russell, Lisa Kilpatrick, Carolyn Burdette, Denise S. Tevis, Zachary A. Fultz, Michael Nelson, Jeff M. Jarrett, Stephen A. Wise, Brittany Kassim, Stephen E. Long
Background Concentrations of critical metabolites, hormones, and nutritional elements change significantly throughout pregnancy. Therefore, increased matrix complexity is a challenge for the measurement of these biomarkers. To provide a quality assurance
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