Selective detection of iodinated hydrocarbons by the electron capture detector with negative ion hydration and photodetachment
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چکیده
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examining the relationship between fear of negative evaluation and communication strategies by iranian efl learners
the purpose of the present study was to investigate the relationship between fear of negative evaluation (fne) and communication strategies (css) among iranian efl learners. it was aimed to examine the differences in the use of communication strategies between speakers with high or low degree of fear of negative evaluation. the current study was a case study consisting of 10 english learners at...
Photodetachment cross sections of the positronium negative ion
The cross sections for the photodetachment from a weakly bound positronium negative ion Ps− below the threshold for the formation of Ps(n = 4) are calculated using the hyperspherical close-coupling method, and are compared with the corresponding spectra for the H− ion. Detailed resonance structures in the spectra near the Ps(n = 2, 3 and 4) thresholds are reported for the first time. The off-re...
متن کاملMass Spectra and Photodetachment of Sodium Fluoride Negative Ion Clusters
A flowing afterglow discharge ion source with NaF vaporized into the flow produces the expected stable anions F-(NaF),, as well as the unusual species Na(NaF); and (NaF); (n < 17). The dominance of (NaF); suggests that it has a particularly stable structure. A fixed-frequency laser has been used to photodetach electrons from mass-selected ion beams extracted from the flowing afterglow. Photoele...
متن کاملDetermination of Isosorbide Dinitrate in Serum by Gas Chromatography with New Generation of Electron Capture Detector and its Application in Pharmacokinetic Study
Isosorbide dinitrate (ISDN) is an effective drug in treatment of angina pectoris. In this study a new generation of electron capture detector (non-radioactive) with a short, non-polar and wide-bore column was used for analysis of ISDN in human serum. ISDN was extracted from serum by a mixture of ether and ethyl acetate and concentrated at room temperature. The method was linear between 5-50...
متن کاملCharacterization of O-sulfopeptides by negative ion mode tandem mass spectrometry: superior performance of negative ion electron capture dissociation.
Positive ion mode collision-activated dissociation tandem mass spectrometry (CAD MS/MS) of O-sulfopeptides precludes determination of sulfonated sites due to facile proton-driven loss of the highly labile sulfonate groups. A previously proposed method for localizing peptide and protein O-sulfonation involves derivatization of nonsulfonated tyrosines followed by positive ion CAD MS/MS of the cor...
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ژورنال
عنوان ژورنال: Analytical Chemistry
سال: 1990
ISSN: 0003-2700,1520-6882
DOI: 10.1021/ac00216a009