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Displaying 1426 - 1450 of 4041

Friction imprint effect in mechanically cleaved BaTiO3 (001)

September 28, 2014

Author(s)

Christian J. Long, Daniel Ebeling, Santiago D. Solares, Rachel J. Cannara

Inhibition of cellular proliferation and enhancement of hydrogen peroxide production in fibrosarcoma cell line by weak radio frequency magnetic fields

September 23, 2014

Author(s)

Pablo Castello, Iain Hill, Lucas Portelli, Frank Barnes, Robert J. Usselman, Carlos Martino

This study presents experimental data for the effects of weak radio frequency (RF) magnetic fields on hydrogen peroxide (H2O2) production and cellular growth rates of fibrosarcoma HT1080 cells in vitro. Cells were exposed either to 45mT static magnetic

Photochemical Properties of Hydrofluoroethers CH3OCHF2, CH3OCF3, and CHF2OCH2CF3: Reactivity toward OH, IR Absorption Cross Sections, Atmospheric Lifetimes and Global Warming Potentials

September 22, 2014

Author(s)

Vladimir L. Orkin, Victor Khamaganov, A G. Guschin

Rate constants for the gas phase reactions of OH radicals with three partially fluorinated ethers, CH3OCF3 (kHFE-143a), CH3OCHF2 (kHFE-152a), and CHF2OCH2CF3 (kHFE-245fa), were measured using a discharge flow electron paramagnetic resonance technique

Influence of glycosidic linkage on the solution conformational entropy of gluco- and mannobioses

September 19, 2014

Author(s)

Andre M. Striegel, Mallory J. Morris

Employing size-exclusion chromatography, an entropically-controlled separation technique, we have determined the solution conformational entropy (-delta S) of (1-2)-, (1-3)-, (1-4)-, and (1-6)-linked gluco- and mannobioses with an alpha anomeric

Creation of Libraries of Recurring Mass Spectra from Large Data Sets assisted by a Dual-Column Workflow

September 18, 2014

Author(s)

William G. Mallard, Stephen E. Stein, Halket M. John, Yuri A. Mirokhin, Nirina Rabe Andriamaharavo

An analytical methodology has been developed for extracting recurrent unidentified spectra (RUS) from large GC/MS data sets. Spectra were first extracted from original data files by the Automated Mass Spectral Deconvolution and Identification System (AMDIS

Identification of phase boundaries in surfactant solutions via Compton spectrum quenching,Identification of phase boundaries in surfactant solutions via Compton spectrum quenching

September 18, 2014

Author(s)

Denis E. Bergeron

The critical micelle concentration and the phase boundary between isolated surfactant molecules and aggregates are probed via fluorescence spectroscopy and a Compton spectrum quenching technique for aqueous and toluenic solutions of Triton X-100 (TX-100)

Visualizing Mass Transport in Desorption Electrospray Ionization using Time-of-Flight Secondary Ion Mass Spectrometry, an In-Depth Study

September 16, 2014

Author(s)

Shinichiro Muramoto

Time-of-flight secondary ion mass spectrometry (ToF-SIMS) was used to visualize the transport of analyte desorbed by a desorption electrospray ionization (DESI) technique. We investigated the effect of probe incidence angle, height, and distance on the

Loss of H2 and CO from Protonated Aldehydes in Electrospray Ionization Mass Spectrometry

September 15, 2014

Author(s)

Pedatsur Neta, Yamil Simon, Yuxue Liang, Stephen Stein

Electrospray ionization mass spectrometry of 3-formylchromones and 3-formylcoumarins shows that collision-induced dissociation of the protonated ions results in elimination of H¬¬2 as a major fragmentation route. This loss of H2 yields an unstable carbonyl

Bromination of marine particulate organic matter through oxidative mechanisms

September 14, 2014

Author(s)

Bruce D. Ravel, Alessandra C. Leri, Kathleen Thornton, Lawrence M. Mayer

Although bromine is considered conservative in seawater, it exhibits a well established correlation with organic carbon in marine sediments. This carbon-bromine association was recently attributed to covalent bonding, with organobromine in sinking

Recommended isolated-line profile for representing high-resolution spectroscopic transitions

September 11, 2014

Author(s)

Joseph T. Hodges, Jonathan Tennyson, P F. Bernath, Alain Campargue, A Csaszar, L Daumont, R R. Gamache, D Lisak, Olga Naumenko, Lawrence Rothman, Ha Tran, N Zobov, Boone Chris, L Gianfrani, Jean M. Hartmann

Recommendations of an IUPAC Task Group formed in 2011 on Intensities and line shapes in high-resolution spectra of water isotopologues from Experiment and Theory" (Project No. 2011-022-2- 100) on line profiles of high-resolution rotational-vibrational

VALIDATION AND TRACEABILITY OF XRF AND SEM-EDS ELEMENTAL ANALYSIS RESULTS FOR SOLDER IN HIGH-RELIABILITY APPLICATIONS

September 9, 2014

Author(s)

John R. Sieber, Adam Mortensen

A procedure and calibration samples have been developed for X-ray fluorescence spectrometry (XRF) and scanning electron microscopy with energy dispersive spectrometry (SEM-EDS) methods of analysis of Sn and Pb mass fractions in solder and coatings in

Pairwise Alignment of Chromatograms using a Fisher-Rao Metric

September 2, 2014

Author(s)

William E. Wallace, Anuj Srivastava, Kelly H. Telu, Yamil Simon

A new approach to aligning chromatograms is introduced and applied to examples of metabolite identification by liquid chromatography mass spectrometry (LC MS). A square root representation of the chromatograms derivative coupled with a Fisher Rao

Do column frits contribute to the on-column, flow-induced degradation of macromolecules?

August 15, 2014

Author(s)

Andre M. Striegel

Flow-induced, on-column degradation is a major hindrance to the accurate characterization of ultra- high molar mass macromolecules and colloids. This degradation is a direct result of the large shear rates which are generated within the column, which cause

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