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Displaying 51 - 75 of 1412

Amino Acid Exchangeability from Experimental Data

October 12, 2021
Author(s)
L Y. Yampolsky, Arlin Stoltzfus
… Amino acid sequence differences between proteins are often … interpreted by reference to a pairwise measure of amino acid similarity, based either on observed evolutionary … distribution of the quantitative effects of amino acid exchanges on protein activity serves as the basis for …

Acid-Assisted Consolidation of Silver Alloys for Direct Fillings

September 1, 1998
Author(s)
F Eichmiller, Kathleen M. Hoffman, A A. Guiseppetti, M M. Wray, R J. Avers
… material. The surface of the silver powder must undergo an acid treatment to remove existing contaminants and prevent … This study was designed to investigate the effect of the acid treatment on the strength of the consolidated alloy, its … the effects of pH and concentrations of fluoboric acid on the flexural strength of silver powder consolidated …

Microwave measurements of proton tunneling and structural parameters for the propiolic acid - formic acid dimer.

October 21, 2011
Author(s)
Adam M. Daly, Kevin O. Douglass, Laszlo C. Sarkozy, Justin L. Neill, Matt T. Muckle, Daniel P. Zaleski, Brooks H. Pate, Stephen G. Kukolich
… Microwave spectra of the propiolic acid-formic acid, (Pro-FA) doubly hydrogen bonded complex were measured … acid dimer, molecular spectroscopy … tunneling and structural parameters for the propiolic acid - formic acid dimer. …

Determination of Organic Acids in Vaccinium Berry Standard Reference Materials

June 27, 2010
Author(s)
Melissa M. Phillips, Lane C. Sander, Katherine E. Sharpless, Stephen A. Wise, Catherine A. Rimmer, Ryan Case, James H. Yen
… Nine organic acids (citric acid, galacturonic acid, glycolic acid, … Organic acids, berry, liquid chromatography, gas chromatography, ion … Determination of Organic Acids in Vaccinium Berry Standard Reference Materials …

Comparison of the Levels of 8-Hydroxyguanine in DNA as Measured by Gas Chromatography-Mass Spectrometry Following Hydrolysis of DNA by Escherichia Coli Fpg Protein or Formic Acid

July 1, 2000
Author(s)
H Rodriguez, J Jurado, J Laval, M. Dizdaroglu
… possible artifacts during the measurement of 8-OH-Gua in acid -hydrolysates of DNA, although the extent of artifacts … For removal of 8-OH-Gua from DNA, we used either formic acid hydrolysis or specific enzymatic hydrolysis with … is not released by the enzyme, whereas guanine released by acid may be oxidized to yield 8-OH-Gua. The measurement of …

Thermophysical Properties of Polyol Ester Lubricants

August 20, 2019
Author(s)
Thomas J. Bruno, Tara Fortin, Marcia L. Huber, Arno D. Laesecke, Eric Lemmon, Elisabeth Mansfield, Mark O. McLinden, Stephanie L. Outcalt, Richard A. Perkins, Kimberly N. Urness, Jason A. Widegren
… and Materials Division on the properties of polyol ester lubricants under interagency agreement number … their experimental uncertainty for three pure polyol ester base fluids (pentaerythritol tetrapentanoate (POE5), … Thermophysical Properties of Polyol Ester Lubricants …

Infrared Detection of a Phenylboronic Acid Terminated Alkane Thiol Monolayer on Gold Surfaces

June 1, 2004
Author(s)
S H. Brewer, A M. Allen, S E. Lappi, T L. Chasse, Kimberly Briggman, C B. Gorman, S Franzen
… sugars to the PBA adlayer through the phenylboronic acid moiety to form a phenylboronate ester. Vibrationally … in position relative to the O-H stretching mode of boronic acid. An IR marker mode was also observed at 1734 cm^-1 upon … Infrared Detection of a Phenylboronic Acid Terminated Alkane Thiol Monolayer on Gold Surfaces …

Interlaboratory Analytical Comparison of Fatty Acid Concentrations in Serum or Plasma

September 20, 2016
Author(s)
Michele M. Schantz, Carissa Powers, Schleicher Rosemary, Joseph Betz, Stephen A. Wise
… for improving the comparability of individual fatty acid measurements in serum and plasma. To date, two exercises of the Fatty Acid Quality Assurance Program (FAQAP) were conducted with 11 … providing more confidence in the comparability of fatty acid measurements. …

Identification of Isethionic Acid and Other Small Molecule Metabolites of Fragilariopsis cylindrus with Nuclear Magnetic Resonance

July 8, 2012
Author(s)
Dan Bearden, Arezue F. Boroujerdi, Peter A. Lee, Giacomo R. DiTullio, Michael G. Janech, Sarah B. Vied
… metabolomics study have led to the discovery of isethionic acid (2-hydroxyethanesulphonic acid, CAS: 107-36-8) as a major metabolite in F. cylindrus. … is the first report of a diatom producing isethionic acid. In addition to isethionic acid, four other metabolites, …

Quantifying Carboxylic Acid Concentration in Model Polyamide Desalination Membranes via Fourier Transform Infrared Spectroscopy

August 21, 2018
Author(s)
Tawanda J. Zimudzi, Kathleen E. Feldman, Michael A. Hickner, Christopher Stafford
… Carboxylic acid groups impart hydrophilicity and ionizable groups to … polymerized polyamide membranes. The carboxylic acid content in these model films was characterized using … For the thinnest membranes studies, the carboxylic acid concentration for films on gold was 0.35 mmol g-1, …

ENTHALPY OF FORMATION OF AQUEOUS HYDROFLUORIC ACID: REVISION NEEDED?

November 7, 2019
Author(s)
Yauheni Paulechka, Andrei F. Kazakov
… Accurate enthalpies of formation of hydrofluoric acid in the gas and liquid states as well as in aqueous … enthalpy of formation, hydrofluoric acid … ENTHALPY OF FORMATION OF AQUEOUS HYDROFLUORIC ACID: REVISION NEEDED? …

Modeling Bubble Points of Mixtures of Hydrofluorocarbon Refrigerants and Polyol Ester Lubricants

March 1, 2002
Author(s)
Marcia L. Huber, E W. Lemon, Daniel G. Friend
… of mixtures of hysrofluorocarbon refrigerants and polyol ester (POE)-based lubricants. We have used this model … the model to include mixtures of refrigerants with polyol ester lubrints. This model has the advantage of incorporating … to apply the simplified SAFT equation of state to polyol ester-based lubricants. We compare the predictions of the …

Standard Reference Materials to Support Measurement of Fatty Acids

April 7, 2009
Author(s)
Lane C. Sander, Michele M. Schantz, Katherine E. Sharpless, Stephen A. Wise
… The use of SRMs to support the measurement of fatty acids is relevant to a broad spectrum of applications … reference, and information values reported for fatty acids. Additional SRMs are under development that will … Reference Materials to Support Measurement of Fatty Acids …

Formic Acid oxidation on platinum- a simple mechanistic study

July 15, 2015
Author(s)
Kathleen A. Schwarz, Ravishankar Sundararaman, Thomas P. Moffat, Thomas C. Allison
… of debate. Historically, mechanisms involving the formic acid molecule have been proposed, but recently a theory has … formic acid oxidation, Pt, fuel cell, electrocatalysis … Formic Acid oxidation on platinum- a simple mechanistic study …

Absolute quantification of RNA or DNA using acid hydrolysis and mass spectrometry

October 22, 2019
Author(s)
Mark S. Lowenthal, Eva Quittman, Karen W. Phinney
… or deoxyribonucleotide oligomers is achievable using acid hydrolysis and isotope dilution mass spectrometry (ID-MS). In this work, formic acid hydrolysis is demonstrated to generate stoichiometric … PCR (ddPCR) techniques agree well to the results. Acid hydrolysis-ID-LC-MS/MS provides excellent quantitative …

A novel approach to converting alkylated arsenic to arsenic acid for accurate ICP-OES determination of total arsenic in candidate speciation standards

August 3, 2018
Author(s)
Savelas A. Rabb, Lee L. Yu, My D. Le
… SRMs 3030, 3031, 3033 and 3034, for monomethylarsonic acid, dimethylarsinic acid, arsenobetaine and arsenocholine, respectively. These … to prevent bias in the ICP-OES measurements. Different acid/solvent combinations were studied to provide the optimum … reference materials, organic, monomethylarsonic acid (MMA), dimethylarsinic acid (DMA), trimethylarsine oxide …

Densities of Phenols, Aldehydes, Ketones, Carboxylic Acids, Amines, Nitriles, and Nitrohydrocarbons

June 1, 2002
Author(s)
Michael D. Frenkel, X Hong, Qian Dong, Xinjian Yan, Robert D. Chirico
… densities for phenols, aldehydes, ketones, carboxylic acids, amines, nitriles, and nitrohydrocarbons both fully … Chapter 4 - the ketones, Chapter 5, the carboxylic acids, Chapter 6 the amines, Chapter 7, nitriles, - Chapter 8 … Densities of Phenols, Aldehydes, Ketones, Carboxylic Acids, Amines, Nitriles, and Nitrohydrocarbons …

Application of the Advanced Distillation Curve Method to the Comparison of Diesel Fuel Oxygenates: 2,5,7,10-Tetraoxaundecane (TOU), 2,4,7,9-Tetraoxadecane (TOD), and Ethanol/Fatty Acid Methyl Ester (FAME) Mixtures

June 22, 2017
Author(s)
Jessica L. Burger, Tara M. Lovestead, Mark LaFollette, Thomas J. Bruno
… (TOU), 2,4,7,9-tetraoxadecane (TOD), and ethanol/fatty acid methyl ester (FAME) mixtures. As observed in earlier studies of … (TOU), 2,4,7,9-Tetraoxadecane (TOD), and Ethanol/Fatty Acid Methyl Ester (FAME) Mixtures …

Cyanate Ester Clay Nanocomposites: Synthesis and Flammability Studies

May 23, 1999
Author(s)
Jeffrey W. Gilman, Richard H. Harris Jr., Douglas Hunter
… clay, dispersed at the nanometer level, in cyanate ester resins for improving flammability. We show that the use … yields exfoliated moutmorillonite in the cured cyanate ester nanocomposites. This reduces the peak heat release rate … would be especially useful in improving toughened cyanate ester resins since the typical toughening agents used often …
Displaying 51 - 75 of 1412
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