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  • Articles  (45)
  • Amino Acid Sequence  (31)
  • Analytical Chemistry and Spectroscopy  (14)
  • 2010-2014  (3)
  • 2005-2009  (4)
  • 1995-1999  (16)
  • 1990-1994  (22)
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  • Articles  (45)
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Year
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  • 1
    Electronic Resource
    Electronic Resource
    Statistical considerations in chromatographic separations (1991)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 14 (1991), S. 501-502 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240140802
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  • 2
    Electronic Resource
    Electronic Resource
    Computer modelling of fragmentation processes in radio frequency multipole collision cells (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 186-197 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: To date, methods for calculating the trajectories of ions in radio frequency (RF) multipole fields have involved solving, analytically or numerically, the appropriate equations of motion. Another method is presented here whereby a non-ideal distribution of field may be modelled and the position of an ion can be tracked, as it traverses the multipole. The validity of the calculations is discussed and some of the properties of collision cells are explained. Fragmentation processes within the cell are modelled showing that the focusing properties within the cell have a striking effect on parent- and daughter-ion transmission.
    Additional Material: 24 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290040605
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  • 3
    Electronic Resource
    Electronic Resource
    Mass spectrometry in the analysis of glutathione conjugates (1993)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 22 (1993), S. 319-325 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200220602
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  • 4
    Electronic Resource
    Electronic Resource
    Quantification of plasma phenylethylamine by combined gas chromatography/electron capture negative ion mass spectrometry of the N-acetyl-N-pentafluorobenzoyl derivative (1991)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 20 (1991), S. 375-381 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An ultrasensitive method capable of detection and quantification of β-phenylethylamine in 1 ml of human plasma has been developed using gas chromatography/electron capture negative ion mass spectrometry. Phenylethylamine and tetra-deutero phenylethylamine internal standard in plasma were acetylated, extracted into organic solvent and then further acylated with pentafluorobenzoyl chloride. The N-acetyl-N-pentafluorobenzoyl-phenylethylamines were detected by high-resolution single ion monitoring of the molecular ions. Normal plasma levels were found to be 41.5 ± 10.7 pg ml-1, in accordance with results of a previous high-performance liquid chromatographic method.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200200608
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  • 5
    Electronic Resource
    Electronic Resource
    Structural characterization by mass spectrometry of native and recombinant human relaxin (1990)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 19 (1990), S. 655-664 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mass spectrometry has played a key role in characterizing the primary structure of native and recombinant relaxin, a peptide hormone that induces ripening of the cervix prior to childbirth. The peptide is composed of two chains, A and B, and is formed from a single-chain prohormone, as is insulin. Aside from conserved cysteines, though, it has little sequence homology with insulin. Due to the small amounts of native peptide initially available ( 〈 10 pmol), traditional techniques could not provide information on the blocked A-chain sequence, on the carboxy-terminal sequences, nor on other possible post-translational modifications. Mass measurements by fast atom bombardment (FAB) were made on reduced human relaxin isolated from corpora lutea. The detection limit by FAB for reduced relaxin was 500 fmol. The B-chain was four amino acids shorter than expected from comparison of the previously known cDNA sequence with homologous rat and porcine sequences. The A-chain, as predicted, was 24 amino acids in length and had a pyroglutamic acid residue on the amino-terminus. The purified samples were homogeneous with no other post-translational modifications. The recombinant relaxin molecule was also extensively characterized by mass spectrometry. In addition to the intact molecule, all tryptic peptides were characterized by FAB. A capillary high-performance liquid chromatography continuous-flow FAB system, developed for high-sensitivity peptide mapping, aided in these analyses. Finally, the three disulfide bonds were shown by tandem mass spectrometry to match those of insulin.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200191105
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  • 6
    Electronic Resource
    Electronic Resource
    Calculation of statistical attributes in small regions of separations: Variation of overlap probability along the separation coordinate (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 7 (1995), S. 3-15 
    Details
    ISSN: 1040-7685
    Keywords: statistical model of overlap ; overlap ; probability ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Theory based on the extended statistical model of overlap (SMO) is proposed to predict the numbers of components in small regions of separations and the likelihood of overlap along the separation coordinate. The extended SMO is an expansion of theory begun a decade ago and, unlike its predecessor, allows one to estimate statistical parameters from separations containing peaks of variable density. These estimations are made possible by frequencies that scale the relative density of peaks. Using a frequency determined from a complex separation, one can critique overlap in small regions of the separation containing as few as five components. The ability to quantify overlap in small regions allows one to characterize local overlap patterns that would be obscured by interpretation of large regions. Furthermore, with the frequency, the probability of forming singlet and multiplet peaks can be calculated along the separation coordinate. Unlike with earlier theory, the frequency allows the values of these probabilities to change continuously throughout the separation. Applications of theory are made to four gas chromatograms of lime oil, which were developed by different temperature programs to vary the peak density therein.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220070102
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  • 7
    Electronic Resource
    Electronic Resource
    Thermospray high performance liquid chromatography/mass spectrometric identification of a bladder carcinogen metabolite isolated from guinea pig urine (1990)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 19 (1990), S. 601-608 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An in vivo uninary metabolite of the bladder carcinogen 2-amino-4-(5-nitro-2-furyl) thiazole was isolated from guinea pig urine and was identified by direct analysis using thermospray mass spectrometry/high-performance liquid chromatography as 1-(2-amino-4-(5-nitro-2-furyl)-2-thiazolyl)-1-deoxy-β-D-glucopyranuronic acid. The structure of this metabolite was also established by chemical synthesis. Both positive and negative ion thermospray mass spectrometry of the conjugate showed fragment ions resulting from cleavage across the pyran ring of the glucuronic acid comprising of aglycone moiety. These characteristic fragment ions may be diagnostic for identification of N-glucuronides from O-glucuronides.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200191005
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  • 8
    Electronic Resource
    Electronic Resource
    Studies on the formation of reactive intermediates from the antineoplastic agent N,N′Bis(2-chloroethyl)-N-nitrosourea (BCNU) in vitro and in Vivo. Characterization of novel glutathione adducts by ionspray tandem mass spectrometry (1995)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 30 (1995), S. 57-68 
    Details
    ISSN: 1076-5174
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In a study designed to examine the nature of short-lived, electrophilic intermediates liberated during decomposition of N,N′-bis(2-chloroethyl)-N-nitrosourea (BCNU) in vitro and also on administration of BCNU (140 μmol i.p.) to rats in vivo, both on-line and off-line LC/MS/MS techniques were employed to detect and characterize the corresponding glutathione (GSH) adducts present in incubation media and excreted into bile, respectively. In vitro, four GSH conjugates were formed and these were identified, on the basis of their product ion spectra, as products of S-and N-carbamoylation and alkylation reactions. Although the relative proportions of these in vitro adducts were found to depend on the molar ratios of GSH and BCNU, the major adduct under all conditions studied proved to be S-(2-chloroethylcarbamoyl)glutathione (SCG). Analysis of untreated bile samples by means of on-line LC/MS/MS with constant neutral loss (129 u) and precursor ion (m/z 179) scanning techniques again led to the detection of four GSH conjugates, although only one of these (SCG) was common to the group of adducts identified in vitro. All of the GSH conjugates detected in bile represented products of S-carbamoylation, indicating that the alkylating moiety released from BCNU undergoes reactions in vivo with nucleophiles other than GSH.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jms.1190300111
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  • 9
    Electronic Resource
    Electronic Resource
    1H and 13C NMR assignment of theaflavin, theaflavin monogallate and theaflavin digallate (1995)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 33 (1995), S. 549-552 
    Details
    ISSN: 0749-1581
    Keywords: NMR ; 1H NMR ; 13C NMR ; HMQC ; HMBC ; theaflavin ; theaflavin monogallate ; theaflavin digallate ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Theaflavin, theaflavin monogallate and theaflavin digallate were isolated from black tea leaves and studied by 1D and 2D NMR techniques, thus allowing unambiguous assignment of the 1H and 13C resonances of these complexes. Earlier studies have not yielded 13C data of equal reliability, especially for the benzotropolone moiety of these molecules, and consequently the data given here will be of use in future studies of natural products isolated from tea. The utility of the 2D proton detected long-range 13C—1H correlation experiment (HMBC) in the study of polyphenolic complexes is demonstrated by these results.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260330709
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  • 10
    Electronic Resource
    Electronic Resource
    Spin trapping chemistry of acyl radicalsThis work was performed in the laboratories of the Department of Chemistry at the University of Georgia. (1995)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 33 (1995), S. S166 
    Details
    ISSN: 0749-1581
    Keywords: spin trapping ; acyl radicals ; EPR ; PBN ; MNP ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The EPR spectra of a variety of different acyl radical adducts of PBN (C-phenyl N-tert-butyl nitrone) and MNP (2-methyl-2-nitrosopropane) were measured and their hyperfine splitting constants determined. Included are benzoyl, acetyl and other alkylacyl, alkoxyacyl, aminoacyl and alkylaminoacyl adducts. All examples gave relatively large β-hydrogen hyperfine splittings ranging from 2.71 to 5.93 G in the PBN spin adducts. Long-range hyperfine splitting was found to both nitrogen and amino-hydrogen atoms in the aminoacyl adducts, indicating specific preferred conformations of the spin adducts. The MNP adducts have the well known 7-8 G nitrogen hyperfine splitting with little else. The existence of hydrogen atom abstraction from benzaldehyde by nitroxides was established, indicating that nitroxides cannot be considered as inert reagents when sent to probe systems containing aldehydes. For example, the EPR signal due to a nitronyl nitroxide was rapidly quenched in the presence of benzaldehyde in benzene. Also, a surprising increase in intensity of benzoyl PBN adduct was noted after photolysis when the light was turned off. Double acyl adduct formation is proposed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260331325
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