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Displaying 301 - 325 of 2028

A Synchrotron X-ray Micro-Spectroscopy Study of the Explosive Melt Glass Derived From the Trinity Nuclear Test

April 28, 2019
Author(s)
Bruce D. Ravel, Daniel E. Crean, Daniel J. Bailey, M. C. Stennett, Claire L. Corkhill, Ryan Tappero, N. C. Hyatt
Trinitite, the explosive melt glass derived from the Trinity nuclear test, is of interest as a model material for nuclear forensics investigation. However, there remains uncertainty as to the mechanism of trinitite formation. In this study, new insight is

A Standards and Measurement Infrastructure for Calibration, Verification and Optimization of Trace Explosives Detection Systems

April 15, 2019
Author(s)
John G. Gillen, Jennifer R. Verkouteren, R M. Verkouteren, Marcela N. Najarro, Edward R. Sisco, Matthew E. Staymates, Jessica L. Staymates, Robert A. Fletcher, Jeffrey A. Lawrence, Elizabeth L. Robinson, Alexander T. Bulk, Joseph A. Bennett, Shinichiro Muramoto, Thomas P. Forbes
Current national priorities in homeland security have led to an unprecedented level of utilization of explosives trace detection (ETD) systems for counterterrorism and law enforcement. Despite the widespread deployment of ETD instruments at airports

Examining the Relationships Between Blubber Steroid Hormone and Persistent Organic Pollutant Measurements in Common Bottlenose Dolphins

March 24, 2019
Author(s)
Thomas M. Galligan, Brian C. Balmer, Lori Schwacke, Jennie L. Bolton, Brian M. Quigley, Patricia Rosel, Gina M. Ylitalo, Ashley Russell
In this study, we use remotely collected blubber samples from common bottlenose dolphins (Tursiops truncatus) inhabiting the waters near a U.S. Environmental Protection Agency Superfund site with high local DDx concentrations, to study the impacts of DDx

SURVEY OF PEPTIDE QUANTIFICATION METHODS AND THEIR REPRODUCIBILITY COMPARISON: A CASE STUDY USING OXYTOCIN

March 20, 2019
Author(s)
Chensheng Li, Sitaram Bhavaraju, Jeremy Melanson, Andreas Blomgren, Torgny Rundlof, Eric L. Kilpatrick, Timothy Rudd, Yves Aubin, Kevin Grant, Edward Saravolac, Tursun Kerim, William Sherman, Yukari Nakagawa, Sergi Pavon, Tim Weel, Arunima Pola, Dinesh Chalasani, Stephen Walfish, Fouad Atouf
USP's peptide reference standards content is typically determined using an HPLC assay against an external standard for which the purity was determined by a mass balance approach. To explore the use of other analyti-cal methods, the USP Biologics Department

interlab: A Python module for analyzing interlaboratory comparison data

March 15, 2019
Author(s)
David A. Sheen
interlab was developed as a software tool to perform consensus analysis on spectral data from interlaboratory studies. It is designed to estimate the spread in the spectral data and to identify possible outliers among both spectral populations and

Lipidomics for wildlife disease etiology and biomarker discovery: a case study of pansteatitis outbreak in South Africa

March 5, 2019
Author(s)
John Bowden, Jeremy P. Koelmel, Candice Z. Ulmer, Susan Fogelson, Hannes Botha, Christina M. Jones, Jackie T. Bangma, Theresa M. Cantu, Matthew P. Guillette, Wilmien Luus-Powell, Joseph Sara, Willem J. Smit, Korin Albert, Harmony Miller, Berkley Olsen, Jason A. Cochran, Timothy J. Garrett, Richard A. Yost
Lipidomics is a promising tool to determine biomarkers and elucidate mechanisms associated with anthropogenic-induced stress in wildlife. Therefore, we examine the application of lipidomics for in situ studies on Mozambique tilapia (Oreochromis mossambicus

COMPOSITION DETERMINATION OF LOW-PRESSURE GAS-PHASE MIXTURES BY 1H NMR SPECTROSCOPY

March 4, 2019
Author(s)
Chris Suiter, Mark O. McLinden, Thomas J. Bruno, Jason A. Widegren
1H NMR spectroscopy was used to analyze vapor-phase mixtures of methane and propane at low to moderate pressures. The mixtures were prepared gravimetrically and had low uncertainty in their composition. The primary mixture used for this work had a methane

Analysis of Iron in Water using a Simple LED Spectrophotometer

February 15, 2019
Author(s)
Benjamin J. Place
Access to clean water is a vitally important part of the lives of all people, yet there is often a concern about the contamination of water by heavy metals. The detection and measurement of heavy metals in water can be performed using colorimetric reagents

Headspace Analysis: Purge and Trap

February 15, 2019
Author(s)
Thomas J. Bruno, Megan E. Harries
Headspace analysis is a technique for sampling and examining the volatiles in a solid or liquid sample. The term headspace refers to the volume of vapor above a condensed phase sample. Purge and trap refers to the headspace technique in which volatile

Headspace Analysis: Static

February 15, 2019
Author(s)
Thomas J. Bruno, Megan E. Harries
Headspace analysis is a technique for sampling and examining the volatiles in a solid or liquid sample. The term headspace refers to the volume of vapor above a condensed phase sample. For most headspace analyses, the sample and its associated headspace

ASTM E2677: Web-based International Standard on Limit of Detection for Explosive Trace Detectors (and More) - Opioids and Ozone

February 12, 2019
Author(s)
R M. Verkouteren, Nathanael A. Heckert, Stefan D. Leigh, Edward R. Sisco, James E. Norris, Jeffrey A. Lawrence, Amber Burns
The performance characteristics of explosive and narcotic trace detectors are mission-critical to agencies worldwide that are charged with protection of the public, defense for mass transit and infrastructure, and the safety of first responders. Commercial

A status of temporal trends of persistent organic pollutants in Arctic biota

February 1, 2019
Author(s)
Frank Riget, Anders Bignert, Birgit Braune, Maria Dam, Rune Dietz, Marlene Evans, Norman Green, Helga Gunnlaugsdottir, Katrin S. Hoydal, John Kucklick, Robert Letcher, Derek Muir, Stacy Schuur, Christian Sonne, Stern Gary, Gregg Tomy, Katrin Vorkamp, Simon Wilson
More than 1000 time-series of persistent organic pollutants (POPs) in Arctic biota from marine and freshwater ecosystems some extending back to the beginning of 1980s were analyzed using a robust statistical method. The Arctic area encompassed extended

Proceedings of the First Workshop on Standards for Microfluidics

January 28, 2019
Author(s)
Darwin R. Reyes-Hernandez, Henne van Heeren
In the last two decades, the microfluidics/lab-on-a-chip field has evolved from the concept of micro total analysis systems, where systems with integrated pretreatment and analysis of chemicals were envisioned, to what is known today as lab-on-a-chip

Real-time liquid-phase organic reaction monitoring with a mid-infrared dual frequency comb spectrometer

January 10, 2019
Author(s)
Daniel I. Herman, Eleanor M. Waxman, Gabriel G. Ycas, Fabrizio R. Giorgetta, Nathan R. Newbury, Ian R. Coddington
We combine high-resolution mid-infrared dual-comb spectroscopy with attenuated total reflectance measurements to provide in-situ monitoring of a chemical reaction. The mid-infrared dual-comb spectrometer measures quantitative absorption cross-sections of

Towards quality assurance and quality control in untargeted metabolomics studies

January 3, 2019
Author(s)
Richard Beger, Warwick B. Dunn, Abbas Bandukwala, Bianca Bethan, David Broadhurst, Clary B. Clish, Surendra Dasari, Leslie Derr, Annie Evans, Steve Fischer, Thomas Flynn, Thomas Hartung, David Herrington, Richard Higashi, Ping-Ching Hsu, Christina Jones, Maureen Kachman, Helen Karuso, Gary Kruppa, Katrice Lippa, Padma Maruvada, Jonathan D. Mosley, Ionna Ntai, Clair O?Donovan, Mary Playdon, Daniel Raftery, Daniel Shaughnessy, Amanda Souza, Timothy Spaeder, Barbara Spalholz, Mukesh Verma, Tilman Walk, Ian Wilson, Daniel Bearden, Krista Zanetti
We describe here the agreed upon first development steps and priority objectives of a community engagement effort to address current challenges in quality assurance (QA) and quality control (QC) in untargeted metabolomic studies. This has included (1) a QA

Transformation of Engineered Nanomaterials through the Prism of Silver Sulfidation

January 1, 2019
Author(s)
Fan Zhang, Andrew J. Allen, Aaron C. Johnston-Peck, Jingyu Liu, John M. Pettibone
Structure transformation of engineered nanomaterials (ENMs) often dictates their efficacy, safety, and environmental impact. To address the existing significant knowledge gap regarding the fundamental kinetic rate and extent of ENMs transformation in
Displaying 301 - 325 of 2028