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  • Analytical Chemistry and Spectroscopy  (1)
  • Engineering  (1)
  • Galactosamine  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Inhibition of superoxide anion release from human polymorphonuclear leukocytes by N-acetyl-galactosamine and N-acetyl-glucosamine (1992)
    Springer
    Clinical rheumatology 11 (1992), S. 254-260 
    Details
    ISSN: 1434-9949
    Keywords: Galactosamine ; Glucosamine ; Polymorphonuclear Leukocyte ; Enzyme Secretion ; Superoxide Anion ; Rheumatoid Arthritis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary This study shows that N-acetyl-galactosamine and N-acetyl-glucosamine and diminish the production of superoxide anion from cytochalasin-B treated PMNs stimulated with FMLP. Inhibition ranged from 80.9% to 1.8%. N-acetyl-galactosamine was superior to N-acetyl-glucosamine, but both showed their action in a dose — related fashion. The mannosamine may diminish the superoxide production, but without a statistical significance. Other sugars such as L-fucose, D-fucose and D-glucose failed to induce inhibition of superoxide generation. Previous reports showed that sugars interfere with carbohydrates lectins interaction. This study shows that aminosugars can do more than interfere with carbohydrates-lectin interaction. The mechanism is not completely known yet. The question whether aminosugars affect cell-cell interaction, regulation of respiratory burst, inflammatory mediators functions, or the glucose uptake and utilization needs further study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02207968
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A non-Jacobian numerical quadrature for semi-infinite integrals (1990)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 29 (1990), S. 833-846 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A non-Jacobian numerical quadrature is proposed for evaluating improper integrals over a semi-infinite range. The quadrature first transforms the semi-infinite integration limit into a finite limit between - 1 and 1. Standard numerical integration procedures such as Gauss-Chebyshev or Gauss-Legendre schemes can then be used to obtain the integral value. Unlike traditional methods using Laguerre or Hermite polynomials, numerical results show that no specific weight function is required for the proposed quadrature to converge as long as the integral exists. The transformation also includes a scale parameter which effectively expands the numerical-integration sampling points along its original semi-infinite integration path. Numerical examples shows that selection of the scale parameter is rather flexible and convergence can always be achieved within a wide range of parameter values. Several applied mechanics problems are also illustrated to validate the proposed numerical scheme. The quadrature can be easily incorporated into finite element or boundary element schemes for the evaluation of semi-infinite integrals.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620290411
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  • 3
    Electronic Resource
    Electronic Resource
    Massenspektrometrische Untersuchungen an 1.1-Difluorcyclopropanen (1976)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 11 (1976), S. 79-85 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mass spectra and fragmentation patterns of several substituted 1,1-difluorocyclopropanes have been investigated. Trends in fragmentation probabilities of different difluorocyclopropanes seem to be related qualitatively to well known empirical substituent effects.
    Notes: Die Massenspektren von verschiedenen substituierten 1.1-Difluorcyclopropanen wurden aufgenommen und ihr Fragmentierungsverhalten untersucht. die Tendenzen in den Bildungswahrscheinlichkeiten der Bruchstükionen bei verschiedenen Difluorcyclopropanen lassen sich qualitativ mit bekanten empirischen Substituenteneffekten erklären.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210110111
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