Results 171 to 180 of about 231,672 (215)
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Environmental Science & Technology, 1990
Selectivity in environmental analyses requires the use of fractionation techniques and HRMS or MS/MS to eliminate specific and nonspecific interferences. In the analysis of TCDDs and TCDFs, HRMS is the method of choice when specific interferences arising from compounds with molecular or fragment ions can be separated from TCDD and TCDF ions at a ...
M. Judith Charles, Yves Tondeur
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Selectivity in environmental analyses requires the use of fractionation techniques and HRMS or MS/MS to eliminate specific and nonspecific interferences. In the analysis of TCDDs and TCDFs, HRMS is the method of choice when specific interferences arising from compounds with molecular or fragment ions can be separated from TCDD and TCDF ions at a ...
M. Judith Charles, Yves Tondeur
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HIGH-RESOLUTION MASS SPECTROMETRY
1971Mass Spectrometry is unique in the type and amount of information that it can often supply on submicrogram samples. Recent advances include improved understanding of the basic factors affecting ion reaction rates, and application of these in metastable and collision-induced decompositions.
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High resolution mass spectrometry of trimethylamine
Organic Mass Spectrometry, 1970AbstractHigh resolution shows that the four principal fragment peaks of trimethylamine are singlets. Close studies of the metastable transitions in the spectrum have established the origin of almost all fragment peaks.
Georg Hvistendahl, Kjell Undheim
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Yeast Expression Proteomics by High-Resolution Mass Spectrometry
2010Comprehensive analysis of yeast as a model system requires to reliably determine its composition. Systematic approaches to globally determine the abundance of RNAs have existed for more than a decade and measurements of mRNAs are widely used as proxies for detecting changes in protein abundance.
Walther, Tobias C +2 more
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High-resolution field-ionization mass spectrometry
International Journal of Mass Spectrometry and Ion Physics, 1969Abstract A dual field-ion/electron impact source has been developed for a high-resolution mass spectrometer with which it is possible to obtain both types of spectra on the same sample with little loss of resolution or mass measuring accuracy. An externally replaceable and adjustable blade emitter gives substantially improved sensitivity (10−7 A torr−
E.M. Chait +4 more
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High resolution field desorption mass spectrometry: II—glycosides
Biological Mass Spectrometry, 1974The high resolution field desorption mass spectra of a number of glycosides are described. In all cases the spectra enabled molecular weights and elemental formulae to be established, and the presence of fragment ions due to cleavage of the sugar groups provides considerable assistance in the identification of sugar and aglycone moieties. The [M + 23Na]
H R, Schulten, D E, Games
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Tissue Analysis with High-Resolution Imaging Mass Spectrometry
2009Molecular mass spectrometric images of tissue sections facilitate precise location of biomolecules, drugs, their metabolites and the biomolecular aberrations they target. Technological developments are rapidly expanding the capabilities of imaging mass spectrometers.
Altelaar, A.F.M., Heeren, R.M.A.
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Signal Detection in High-Resolution Mass Spectrometry Data
Journal of Proteome Research, 2008Mass spectrometry data from high-resolution time-of-flight instruments often contain a vast number of noninformative background-ion peaks whose signal is similar to that of peptide peaks. Consequently, seeking peptide signal in these spectra based on a signal-to-noise ratio will remove signal peaks as well as noise.
Dale F, McLerran +4 more
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High-resolution tandem mass spectrometry of carbonic anhydrase
Analytical Chemistry, 1994Electrospray ionization of carbonic anhydrase with ion dissociation yields a mass spectrum from which the masses of > 100 isotopic clusters are determined accurately, with the number of charges assigned directly from resolved isotopic peaks. Of these clusters, 80% correspond to fragmentation at or near the amino acid proline. The masses of combinations
M W, Senko, S C, Beu, F W, McLafferty
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High‐Resolution Ion Mobility Spectrometry–Mass Spectrometry on Poly(methyl methacrylate)
Angewandte Chemie International Edition, 2010Further dimensions: The title mass spectrometric technique offers an extra dimension of separation based on size and conformation of the molecules in addition to m/z separation without the need of time-consuming liquid chromatography separation. Detailed mapping of the mass and drift time separated ions allowed identification of end groups originating ...
Song, J. +4 more
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