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Environment

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Displaying 101 - 125 of 537

Naturally occurring organobromine compounds (OBCs) including polybrominated dibenzo-p-dioxins in the marine sponge Hyrtios proteus from The Bahamas

August 25, 2021
Author(s)
Qiong Wu, Natalie Eisenhardt, Stephanie Shaw, Joseph Pawlik, John Kucklick, Walter Vetter
Halogenated natural products (HNPs) were identified from organic extracts of the marine sponge Hyrtios proteus from The Bahamas (Caribbean, FAO fishing area 31) using gas chromatography with electron capture negative ion mass spectrometry (GC/ECNI-MS) and

Quantifying Machining Process Inventories In Detailed Design

August 24, 2021
Author(s)
William Z. Bernstein, Till Boettjer, Deverajan Ramanujan
This paper quantifies machining process inventories based on commonly used techniques in various stages of the detailed design process. We investigate variabilities in process inventories between these techniques and their relation to manufacturing process

Crystal Structure, Sorption Property and Electronic Structure of the Flexible MOF, (Ni-4,4'azopyridine)[Ni(CN)4]

August 16, 2021
Author(s)
Winnie Wong-Ng, Gregory T. McCandless, Jeffrey T. Culp, Matthew Lawson, Yu-Sheng Chen, Daniel Siderius, Lan Li
The flexible metal organic framework (MOF) compound, Ni(L)[Ni(CN)4], (L = 4,4'azopyridine (C10N4H8), nicknamed AzoPyr) is a 3D porous material that adopts the Hofmann-type structure. This paper reports our synthesis of Ni-AzoPyr and its structural, bonding

MS_Piano: A Software Tool for Annotating Peaks in CID Tandem Mass Spectra of Peptides and N-Glycopeptides

July 15, 2021
Author(s)
Xiaoyu (Sara) Yang, Pedatsur Neta, Yuri Mirokhin, Dmitrii V. Tchekhovskoi, Concepcion Remoroza, Meghan Burke Harris, Yuxue Liang, Sanford Markey, Stephen E. Stein
Annotating product ion peaks in tandem mass spectra is essential for evaluating spectral quality and validating peptide identification. This task is more complex for glycopeptides and is crucial for the confident determination of glycosylation sites in

Microplastic Spectral Classification Needs an Open Source Community: Open Specy to the Rescue!

May 19, 2021
Author(s)
Win Cowger, Gray Andrew, Chelsea Rochman, Sebastian Primpke, Jennifer Lynch, Hannah Hapich, Hannah De Frond, Keenan Munno
Microplastic pollution research has suffered from inadequate data and tools for spectral (Raman and infrared) classification. Spectral matching tools often are not accurate for microplastics identification and are cost-prohibitive. Lack of accuracy stems

Environmental Protection Agency Blind Audit 2018

May 17, 2021
Author(s)
Christina Cecelski, Cassie Goodman, Jennifer Carney
The U.S. Environmental Protection Agency (EPA) conducted a blind audit of EPA protocol calibration gas mixtures produced by specialty gas manufactures. The objective was to determine the amount-of-substance fraction (concentration) of the analytes in the

Environmental Source Tracking of Per- and Polyfluoroalkyl Substances within a Forensic Context: Current and Future Techniques

May 13, 2021
Author(s)
Alix Rodowa, Joseph A. Charbonnet, Jennifer L. Guelfo, Jennifer A. Field, Gerrad D. Jones, Christopher P. Higgins, Damian E. Helbling, Erika F. Houtz
The source tracking of per- and polyfluoroalkyl substances (PFASs) is a new and increasingly important field within environmental forensics. We define PFAS source tracking as the accurate characterization and differentiation of multiple sources

Facile fabrication and characterization of kraft lignin@Fe3O4 nanocomposites using pH driven precipitation: effects on increasing lignin content

April 1, 2021
Author(s)
Frankie A. Petrie, Justin Gorham, Robert T. Busch, Serhiy O. Leontsev, Esteban E. Urena-Benavides, Erick S. Vasquez
Kraft lignin@Fe3O4 multicore nanocomposites fabrication proceeded using a simple pH-driven precipitation technique. An alkaline solution for kraft lignin (pH 12) was rapidly injected into an aqueous-based magnetite (Fe3O4) nanoparticle colloidal suspension

Synthesis, Structural and Sorption Characterization of a Hofmann Compound, Ni(3-Methy-4,4'-bipyridine)[Ni(CN)4]

March 6, 2021
Author(s)
Winnie Wong-Ng, Jeffrey T. Culp, Daniel Siderius, Yu-Sheng Chen, S. Y. G. Wang, Andrew J. Allen, Eric J. Cockayne
Crystal structure of the guest-free Ni(CN)4-based metal organic framework Ni(3-Methy-4,4'-bipyridine)[Ni(CN)4] (nicknamed Ni-BpyMe(A)), was determined to be orthorhombic, Pmma, a= 12.6025(4) Å, b=7.3324(3) Å, c=11.3095(4) Å, V=1045.07 (2) Å3 and Z=2

National Institute of Standards and Technology Environmental Scan 2020

February 9, 2021
Author(s)
Heather Evans, Kristen K. Greene, William M. Healy, Elizabeth Hoffman, Kate Rimmer, Anna V. Sberegaeva, Neil M. Zimmerman
The 2020 National Institute of Standards and Technology Environmental Scan provides an analysis of key external factors that could impact NIST and the fulfillment of its mission in coming years. The analyses were conducted through four separate lenses

Assessing Human Exposure to Chemicals in Materials, Products and Articles: A Modular Mechanistic Framework

December 15, 2020
Author(s)
Clara M. Eichler, Ying Xu, Jianping Cao, Charles J. Weschler, Tunga Salthammer, Glenn C. Morrison, Yinping Zhang, Corinne Mandin, Wenjuan Wei, Patrice Blondeau, Dustin Poppendieck, Elaine A. Cohen Hubal, Xiaoyu Liu, Christiaan Delmaar, Antti J. Koivisto, Oliver Jolliet, Hyeong-Moo Shin, Miriam L. Diamond, Chenyang Bi, John C. Little
This paper describes a modular mechanistic framework for predicting chemical emission from indoor sources, partitioning among indoor compartments and exposure to humans present in the indoor environment focusing on semi-volatile organic compounds (SVOCs)

Study of the Reactions of OH with HCl, HBr, and HI between 298 K and 460 K.

November 24, 2020
Author(s)
Vladimir L. Orkin, Victor Khamaganov, Igor Larin
The reactions between OH radicals and hydrogen halides (HCl, HBr, HI) have been studied between 298 K to 460 K by using a discharge flow – electron paramagnetic resonance technique. The rate constants at room temperature were found to be kHCl(298 K) = (7.9

Characterization of Long-Term Sub-Hourly Thermal Comfort Performance Data

November 1, 2020
Author(s)
Hyojin Kim, Lisa Ng, Brian P. Dougherty, William V. Payne
Current thermal comfort standards do not provide guidelines on how to graphically characterize and benchmark long-term, sub-hourly, thermal comfort. In an effort to address this void, several statistical characterizations and advanced visualization methods

TRACE ELEMENT CONCENTRATIONS IN BLOOD AND SCUTE TISSUES FROM WILD AND CAPTIVE HAWAIIAN GREEN SEA TURTLES (CHELONIA MYDAS)

October 16, 2020
Author(s)
Katherine Shaw, Jennifer Lynch, George H. Balazs, T. T. Jones, Jeff Pawloski, Marc Rice, Amanda French, Jing Liu, David Klein
Hawaiian green sea turtles (Chelonia mydas) are exposed to trace elements through water, sediment, and food. High concentrations of elements have been shown to decrease immune function, impair growth, and decrease reproduction in wildlife. This study

Optical and Mechanical Design of a Telescope for Lunar Spectral Irradiance Measurements from a High-Altitude Aircraft

September 8, 2020
Author(s)
Clarence Zarobila, Steven Grantham, Steven W. Brown, John T. Woodward IV, Stephen Maxwell, Dana R. Defibaugh, Thomas Larason, Kevin Turpie
We have designed a non-imaging telescope for measurement of the spectral irradiance of the moon. The telescope was integrated into a wing pod of a NASA ER-2 research aircraft to measure lunar spectral irradiance during flight. The telescope and support

Niche partitioning of microbial communities at an ancient vitrified hillfort: implications for vitrified radioactive waste disposal

August 30, 2020
Author(s)
Andrew Plymale, Jacqueline Wells, Carolyn Pearce, Colin Brislawn, Emily Graham, Tanya Cheeke, Jessica Allen, Sarah Fansler, Bruce Arey, Mark Bowden, Danielle Saunders, Vincent Danna, Kimberly Tyrrell, Jamie Weaver, Rolf Sjoblom, Rick L. Paul, John McCloy, Eva Hjarthner-Holdar, Mia Englund, Erik Ogenhall, David Peeler, Albert Kruger
A pre-Viking era vitrified hillfort, Broborg, provides a habitat analogue for disposed radioactive waste glass and shows strong niche partitioning among the organisms involved in glass alteration. Microbes cannot be eliminated from radioactive waste
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