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Isoperimetric inequalities are applied to a moving-boundaryproblem for doubly-connected domains. This problem occurs forexample in electrochemistry, in which case the domains in questionare the electrolyte of an electrolytic cell. The two electrodessurrounding the electrolyte are assumed to grow or dissolve,at different rates in general, by electrochemical reaction.We obtain optimal estimates showing, for example, that the leastchange in volume of each electrode always occurs in sphericalsymmetry. 相似文献
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George L Kalume A Esselman B McMahon RJ Reid SA 《The journal of physical chemistry. A》2011,115(35):9820-9827
Halogen atoms are important reactive radicals in the atmosphere. In this work, pulsed jet discharge matrix isolation spectroscopy and computational methods were used to characterize prereactive complexes of halogen atoms with simple halons. Our experiments combined matrix isolation techniques with a pulsed DC discharge nozzle, where a dilute CH(2)XBr (X = H, Cl, Br)/rare gas sample was gently discharged and the products were deposited onto a cold KBr window. The Br···BrCH(2)X (X = H, Cl, Br) complexes were characterized by infrared and electronic spectroscopy, supported by ab initio and density functional theory (DFT) calculations, which shed light on the structure of, bonding in, and binding energy of the complexes. The correlation of charge-transfer energy with donor ionization potential (Mulliken correlation) was examined, and the charge-transfer photochemistry of the complexes was explored. 相似文献
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Todd A. Lydic Julia V. Busik Walter J. Esselman Gavin E. Reid 《Analytical and bioanalytical chemistry》2009,394(1):267-275
A “shotgun” tandem mass spectrometry (MS) approach involving the use of multiple lipid-class-specific precursor ion and neutral
loss scan mode experiments has been employed to identify and characterize the glycerophosphatidylethanolamine (GPEtn) lipids
that were present within a crude lipid extract of a normal rat retina, obtained with minimal sample handling prior to analysis.
Characterization of these lipids was performed by complementary analysis of their protonated and deprotonated precursor ions,
as well as their various ionic adducts (e.g., Na+, Cl-), using a triple-quadrupole mass spectrometer. Notably, the application of novel precursor ion and neutral loss scans of
m/z 164 and m/z 43, respectively, for the specific identification of sodiated GPEtn precursor ions following the addition of 500 μM NaCl
to the crude lipid extracts was demonstrated. The use of these novel MS/MS scans in parallel provided simplified MS/MS spectra
and enhanced the detection of 1-alkenyl, 2-acyl (plasmenyl) GPEtn lipids relative to the positive ion mode neutral loss m/z 141 commonly used for GPEtn analysis. Furthermore, the novel use of a “low energy” neutral loss scan mode experiment to monitor
for the exclusive loss of 36m/z (HCl) from [M+Cl]- GPEtn adducts was demonstrated to provide a more than 25-fold enhancement for the detection of GPEtn lipids in negative ion
mode analysis. Subsequent “high-energy” pseudo MS3 product ion scans on the precursor ions identified from this experiment were then employed to rapidly characterize the fatty
acyl chain substituents of the GPEtn lipids.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users.
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Gavin E. ReidEmail: |
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