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Displaying 26 - 50 of 1590

Quasi-elastic Neutron Scattering Measurement of Hydrogen Diffusion in a Graphene Oxide Framework

April 16, 2020
Matthew J. Connolly, Z. N. Buck, Carlos Wexler, Joseph C. Schaeperkoetter, H. Taub, Andrew Gillespie, Helmut Kaiser
We present quasielastic neutron scattering (QENS) spectra from molecular hydrogen adsorbed in GOF. The measurements probed the motion of adsorbed hydrogen as a function of pressure, in order to understand the relationship between the motion of adsorbed

Characterization of triacontyl (C-30) liquid chromatographic columns

March 15, 2020
Lane C. Sander, Catherine A. Rimmer, Walter B. Wilson
Differences in the performance characteristics of seventeen commercial C30 liquid chromatographic columns were studied for the separation of carotenoid isomers. A mixture consisting of nine xanthophyll and hydrocarbon carotenoids were separated under

Optimum lithium loading of a liquid scintillator for neutron and neutrino detection

February 11, 2020
Hans P. Mumm, Denis E. Bergeron, Mark A. Tyra, Jerome J. LaRosa, Svetlana Nour, T.J. Langford, Dimitry A. Pushin
Neutral particle detection in high-background environments is greatly aided by the ability to easily load 6Li into liquid scintillators. We describe a readily available and inexpensive liquid scintillation cocktail stably loaded with up to 1 % Li by mass

Excess Electrons Bound to H2S Trimer and Tetramer Clusters

January 24, 2020
Gaoxiang Liu, Manuel D?az-Tinoco, Sandra M. Ciborowski, Svetlana Lyspustina, Jay H. Hendricks, Vincent Ortiz, Kit H. Bowen
The hydrogen sulfide trimer and tetramer anions, (H2S)3– and (H2S)4–, were generated by Rydberg electron transfer and studied via a synergy between velocity-map imaging anion photoelectron spectroscopy and high-level quantum chemical calculations. The

An updated protocol based on CLSI document C37 for preparation of off-the-clot serum from individual units for use alone or to prepare commutable pooled serum reference materials

October 30, 2019
Johanna Camara, Uliana Danilenko, Hubert W. Vesper, Gary L. Myers, Patric A. Clapshaw, W. Greg Miller
Manufacturers of in-vitro diagnostic medical devices, clinical laboratories, research laboratories and calibration laboratories require commutable reference materials that can be used in the calibration hierarchies of medical laboratory measurement

Unusual Regularity in GC Retention of Simple Amino Acid Derivatives

August 8, 2019
Anzor I. Mikaia, Nino G. Todua, Zenkevich G. Igor
Background. Application of simple regularities and the general principles along with direct use of reference retention index data is a useful approach for reliable structure determination of compounds by GC-MS. Objective. Interpretation of anomaly in

Stability of gaseous volatile organic compounds contained in gas cylinders with different internal wall treatments

July 29, 2019
George C. Rhoderick, Christina E. Cecelski, Walter R. Miller Jr., David Worton, Sergi Moreno, Paul Brewer, Joele Viallon, Faraz Idrees, Philippe Moussay, Yong D. Kim, Dal H. Kim, Sangil Lee, Annarita Baldan, Jianrong Li
Volatile organic compounds (VOCs) are a group of gas-phase compounds present in the atmosphere that affect air quality and Earth’s climate. Halocarbons, a subset of this group, are strong greenhouse gases and are linked to stratospheric ozone depletion

Precision, Tunable Deuterated Polyethylene via Polyhomologation

July 22, 2019
Wesley Farrell, Sara V. Orski, Anthony P. Kotula, Kathryn L. Beers, Daniel Baugh
Polyhomologation (also known as “C1 polymerization”) of a deuterated ylide has been performed, which yields linear polyethylene of high deuterium content. Copolymerization with the protonated analog allows for the preparation of sta-tistical copolymers, in

Density Functional Theory Meta GGA Study of Water Adsorption in MIL-53(Cr)

July 16, 2019
Eric J. Cockayne
We use density functional theory meta-GGA TPSS+D3(BJ)+U+J calculations to investigate the energetics and geometry of water molecules in the flexible metal-organic framework material MIL-53(Cr) as a function of cell volume. The critical concentration of

Measuring Ion-Pairing and Hydration in Variable Charge Supramolecular Cages with Microwave Microfluidics

May 17, 2019
Angela C. Stelson, Cynthia M. Hong, Mitchell C. Groenenboom, Charles A. Little, James C. Booth, Nathan D. Orloff, Robert G. Bergman, Kenneth N. Raymond, Kathleen A. Schwarz, F. D. Toste, Christian J. Long
MetaMetal–organic supramolecular cages can act as charged molecular containers that mediate reactions, mimic enzymatic catalysis, and selectively sequester chemicals.1,2 The hydration of these cages in solution plays a crucial role in their interactions

Examining American Alligators as Sentinels of Toxic Trace Element Exposure in Human Populations

April 15, 2019
Frances Nilsen, Thomas Rainwater, Stephen E. Long, Tracey B. Schock, Philip Wilkinson, Arnold Brunell, Brittany Kassim, John Bowden
Mercury (Hg) is a ubiquitous toxic element eliciting a myriad of health problems including Minamata disease. Exposure to methylmercury, the most toxic bioaccumulative form of Hg, occurs through aquatic dietary sources. Many nations have consumption

Removal of Synthetic Azo Dye using Bimetallic Nickel-Iron Nanoparticles

March 19, 2019
Shelby Foster, Katie Estoque, Michael Voecks, Nikki S. Rentz, Lauren Greenlee
Bimetallic nanoparticles comprised of Iron (Fe) and Nickel (Ni) were investigated for the removal of an azo dye contaminant in water. NiFe nanoparticles were synthesized using a batch aqueous synthesis method that is scalable and environmentally safe


March 12, 2019
Vladimir P. Oleshko
This article describes electron energy-loss spectroscopy (EELS), energy-filtering transmission electron microscopy (EFTEM) and electron spectroscopic diffraction (ESD) in a transmission electron microscope (TEM) or in a scanning transmission electron

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

February 1, 2019
Frank Riget, Anders Bignert, Birgit Braune, Maria Dam, Rune Dietz, Marlene Evans, Norman Green, Helga Gunnlaugsdottir, Katrin S. Hoydal, John R. Kucklick, Robert Letcher, Derek Muir, Stacy S. 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

Optimization of Folch, Bligh-Dyer, and Matyash Sample-to-Extraction Solvent Ratios for Mammalian Cell- and Plasma-Based Lipidomics Studies

December 11, 2018
John Bowden, Candice Z. Ulmer, Christina M. Jones, Richard A. Yost, Timothy J. Garrett
In order to investigate changes in the lipidome, analysis by ultra-high performance liquid chromatography – high resolution mass spectrometry (UHPLC-HRMS) typically requires the extraction of lipid content from sample matrices using optimized, matrix
Displaying 26 - 50 of 1590