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Displaying 1701 - 1725 of 4041

Size-Exclusion Chromatography of Asphaltenes: An Experimental Comparison of Commonly-Used Approaches

May 4, 2013

Author(s)

Shen Dong, Andre Striegel

Asphaltenes, the heaviest and most polar fraction of crude oil, are responsible for the clogging of oil pipelines and of underground reservoir rocks. Asphaltenes are defined as a solubility class (toluene- or benzene-soluble, n-heptane insoluble), and a

Quantitative Measurement of Electrochemically Induced DNA Damage Using Capillary Electrophoresis

May 3, 2013

Author(s)

Donald H. Atha, Niyatie Ammanamanchi, Mofiyin Obadina, Vytautas Reipa

Exposure of mammalian cells to oxidative stress can result in DNA damage that adversely affects many cell processes. We used bulk electrolysis in an electrochemical system and capillary electrophoresis (CE) to control and measure the effect of oxidative

Light-Wave Mixing with Quantum Gases

May 1, 2013

Author(s)

Lu Deng, Edward W. Hagley, R Q. Wang, Charles W. Clark

Nonlinear optics has come a long way since the laser. This article reviews recent progress in coherent light-matter wave mixing and introduces some new concepts that will reframe future research directions.

Frequency-agile, rapid scanning spectroscopy

April 28, 2013

Author(s)

Gar W. Truong, Kevin O. Douglass, Stephen E. Maxwell, Roger D. van Zee, David F. Plusquellic, Joseph T. Hodges, David A. Long

Challenging applications in trace gas analyses require high precision and acquisition rates.1-4 Many continuous-wave laser spectroscopy techniques exhibit significant sensitivity and potential;5 however, their scanning rates are slow because they rely upon

Universal Proteolysis and MSn for N- and O- Glycan Branching Analysis

April 20, 2013

Author(s)

John E. Schiel, Karen W. Phinney, Nicholas J. Smith

The continually growing list of critical glycosylation-related processes has made analytical methodology for detailed glycan characterization an area of increasing interest. Glycosylation is a post translational modification of unsurpassed complexity due

Certified Reference Material Recipe Challenge

April 19, 2013

Author(s)

Catherine A. Rimmer, Melissa M. Phillips

Compositional Analysis and Advanced Distillation Curve for Mixed Alcohols Produced via Syngas on a K-CoMoSx Catalyst

April 19, 2013

Author(s)

Jesse E. Hensley, Tara Lovestead, Earl Christensen, Abhijit Dutta, Thomas J. Bruno, Robert McCormick

The distillation behavior of mixed alcohols was studied using the Advanced Distillation Curve (ADC) methodology. Crude mixed oxygenates were generated from syngas over a potassium promoted cobalt molybdenum sulfide catalyst and assayed for major and minor

Practical Considerations for Preparing Polymerized Phospholipid Bilayer Capillary Coatings for Protein Separations

April 13, 2013

Author(s)

Elisabeth Mansfield, Seid M. Adem, John P. Keogh, Craig A. Aspinwall, Henry K. Hall

Phosphorylcholine (PC) based phospholipid bilayers have proven useful as capillary coating materials due to their inherent resistance to non-specific protein adsorption. The primary limitation of this important class of capillary coatings remains the

Mass Spectrometry Quantification Revealed Accumulation of C-terminal Fragment of Apolipoprotein E in the Alzheimer's Frontal Cortex*s

April 11, 2013

Author(s)

Meiyao M. Wang, Illarion Turko

Polymorphic variation in the apolipoprotein E (apoE) gene is the major genetic susceptibility factor for late onset Alzheimer's disease (AD) and likely contributes to neuropathology through various pathways. It is recognized that apoE undergoes proteolytic

Remarks on the Phase Change of the Electronic Wave Function Upon Going Once Around a Jahn-Teller Conical Intersection in Vibrational Coordinate Space

April 11, 2013

Author(s)

Jon T. Hougen

In this paper we revisit, with pedagogical emphasis for high-resolution spectroscopists, some presently existing discussions of phase factors for fixed-nuclei electronic wavefunctions in the Jahn-Teller problem. We give explicit examples, for a symmetric

A simple and sensitive HPLC-ICP-MS method for the accurate determination of Vitamin B12 in Fortified Breakfast Cereals and Multivitamin Tablet Reference Materials

April 10, 2013

Author(s)

Siva K. Chinthalapati, Lee L. Yu, John E. Schiel, Stephen E. Long

A sensitive high performance liquid chromatography (HPLC) coupled with inductively coupled plasma mass spectrometry (ICP-MS) method has been developed for the determination of vitamin B12. The method was based on efficient isocratic separation with a

Chemical imaging beyond the diffraction limit using photothermal induced resonance microscopy

April 2, 2013

Author(s)

Andrea Centrone, Basudev Lahiri, Glenn E. Holland

Photo Thermal Induced Resonance (PTIR), recently attracted great interest for enabling chemical identification and imaging with nanoscale resolution. In this paper, the PTIR working principles are reviewed along the main results from a recent publication

Measurements of Rate Constants for OH Reactions with Bromoform (CHBr3), CHBr2Cl, CHBrCl2, and Epichlorohydrin C3H5ClO)

March 28, 2013

Author(s)

Vladimir L. Orkin, Victor Khamaganov, S N. Kozlov, Michael J. Kurylo III

Measurements of the rate constants for the gas phase reactions of OH radicals with bromoform (CHBr3) and epichlorohydrin (C3H5ClO) were performed using a flash photolysis resonance-fluorescence technique over the temperature range 230 K to 370 K. The

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