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121.
We present tandem quadrupole mass spectrometric data for 26 organophosphate and 16 carbamate pesticides. These data are of use in developing methods for screening samples for specific compounds (by selected reaction monitoring) or specific classes of compounds (by parent scans and neutral loss scans). Optimization of tandem mass spectrometry conditions for maximum sensitivity is also described. 相似文献
122.
123.
Listeners' ability to discriminate interaural time difference (ITD) changes in low-frequency noise was determined as a function of differences in the noise spectra delivered to each ear. An ITD was applied to Gaussian noise, which was bandpass filtered using identical high-pass, but different low-pass cutoff frequencies across ears. Thus, one frequency region was dichotic, and a higher-frequency region monotic. ITD thresholds increased as bandwidth to one ear (i.e., monotic bandwidth) increased, despite the fact that the region of interaural spectral overlap remained constant. Results suggest that listeners can process ITD differences when the spectra at two ears are moderately different. 相似文献
124.
Matthew J. Pollard Christopher K. Hilton Hongli Li Kimberly Kaplan Richard A. Yost Herbert H. HillJr. 《International Journal for Ion Mobility Spectrometry》2011,14(1):15-22
Since the development of electrospray ionization (ESI) for ion mobility spectrometry mass spectrometry (IMMS), IMMS have been
extensively applied for characterization of gas-phase bio-molecules. Conventional ion mobility spectrometry (IMS), defined
as drift tube IMS (DT-IMS), is typically a stacked ring design that utilizes a low electric field gradient. Field asymmetric
ion mobility spectrometry (FAIMS) is a newer version of IMS, however, the geometry of the system is significantly different
than DT-IMS and data are collected using a much higher electric field. Here we report construction of a novel ambient pressure
dual gate DT-IMS coupled with a FAIMS system and then coupled to a quadrupole ion trap mass spectrometer (QITMS) to form a
hybrid three-dimensional separation instrument, DT-IMS-FAIMS-QITMS. The DT-IMS was operated at ~3 Townsend (electric field/number
density (E/N) or (Td)) and was coupled in series with a FAIMS, operated at ~80 Td. Ions were mobility-selected by the dual
gate DT-IMS into the FAIMS and from the FAIMS the ions were detected by the QITMS for as either MS or MSn. The system was evaluated using cocaine as an analytical standard and tested for the application of separating three isomeric
tri-peptides: tyrosine-glycine-tryptophan (YGW), tryptophan-glycine-tyrosine (WGY) and tyrosine-tryptophan-glycine (YWG).
All three tri-peptides were separated in the DT-IMS dimension and each had one mobility peak. The samples were partially separated
in the FAIMS dimension but two conformation peaks were detected for the YWG sample while YGW and WGY produced only one peak.
Ion validation was achieved for all three samples using QITMS. 相似文献
125.
Friedrich Müller C. Morton E. C. Gilbert Cobb H. M. Partridge M. R. Thompson H. Th. St. Britton W. S. Hughes Beatrice M. Wilson W. B. Pleass A. Roche J. Roche E. B. R. Prideaux F. T. Winfield K. Drewski Fr. L. Hahn A. Petit Erich Müller F. Ishikawa T. Murooka Sho-Chow Woo Don M. Yost M. Delépine O. Stelling R. Bennewitz W. Pugh B. Stehlik N. Allen N. H. Furman I. Tananaeff und L. Tronstad 《Fresenius' Journal of Analytical Chemistry》1933,95(1-3):48-57
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