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  • 1
    Electronic Resource
    Electronic Resource
    The use of 13C N.M.R. spectroscopy to monitor changes in the composition of the medium during the growth of Mycobacterium BCG (1981)
    Springer
    Biotechnology letters 3 (1981), S. 675-678 
    Details
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A novel application of the use of 13C N.M.R. spectroscopy to monitor changes in the concentration of amino acids, glycerol and glucose during the growth of Mycobacterium BCG in simple medium is described. In amino acid media, sodium glutamate and asparagine provide the C and N sources; glutamine is not utilised. In glycerol medium 20–25% of the carbon source is used after 14 days growth; only 8.5% glucose is used during the same period. The advantages of this method are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00134842
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mechanism of the hydrolysis of adenosine 5′-triphosphate: A regression analysis of kinetic data (1989)
    New York, NY : Wiley-Blackwell
    Journal of Chemometrics 3 (1989), S. 569-577 
    Details
    ISSN: 0886-9383
    Keywords: ATP hydrolysis ; Regression analysis ; Model discrimination ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Data of the hydrolysis of adenosine 5′-triphosphate have been re-evaluated using a computer program that numerically integrates the differential rate equations within a routine that optimizes rate coefficients given a suitable model and concentration versus time data.The model is tested by calculation of Hamilton R-values, the Fisher F-statistic, a sensitivity analysis, the standard errors on the rate coefficients and by constructing contour maps of the objective function versus two rate coefficients.An optimization using only phosphate concentration data cannot distinguish between a model in which adenosine 5′-monophosphate is formed predominantly directly with a molecule of pyrophosphate, and one in which it is formed via adenosine 5′-diphosphate. A more accurate set of rate coefficients is calculated from existing data and the relative importance of the two paths determined.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cem.1180030405
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    ESR spectroscopy of the 4,5-bis(methoxycarbonyl)-1,3,2-dithiazol-2-yl radical labelled with sulphur-33 and nitrogen-15 (1988)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 26 (1988), S. 755-759 
    Details
    ISSN: 0749-1581
    Keywords: ESR ; 1,3,2-Dithiazol-2-yl radicals ; 33S-labelled free radicals ; Energy calculations of conformers ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A derivative of the 1,3,2-dithiazol-2-yl radical was labelled with 33S in order to evaluate the p spin densities on the sulphur atoms. This information is required to provide a full description of the SOMO which, in turn, aids the understanding of the structure of the radical dimers. An unexpected result is that the two sulphur atoms are non-equivalent in the solid state. Calculations suggest that this is due to out-of-plane twisting of the substituent groups. Comparison of the ESR parameters of the bis(methoxycarbonyl) derivative with other members of the 1,3,2-dithiazol-2-yl group of radicals (including the parent radical) shows that it is a good model for the whole group.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260260906
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Stable conformations and energy barriers to rotation in perfluoro(4-sec-butylpyridine) (1990)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 28 (1990), S. 268-270 
    Details
    ISSN: 0749-1581
    Keywords: Perfluoro(4-sec-butylpyridine) ; Semi-empirical MO calculations ; PM3 Hamiltonian ; Conformational analysis ; Variable-temperature ; 19F NMR ; Perfluoroalkyl-aryl rotational barrier ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: All-valence-electron MNDO-SCF-MO calculations were carried out on perfluoro(4-sec-butylpyridine) in order to calculate the stable conformations of the perfluoroalkyl group and the energy barrier to rotation of this group around the Calkyl—Caryl, bond. Both the AM1 and PM3 Hamiltonians were used. The results were compared with the value obtained from a variable-temperature study of the 19F NMR spectrum of the compound. The PM3 method is shown to give a significant improvement compared with AM1.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260280314
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    Paper (German National Licenses)
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