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  • Electronic Resource  (7)
  • Book
  • 1970-1974  (7)
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 44 (1972), S. 1152-1158 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 92 (1970), S. 5516-5517 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 93 (1971), S. 1481-1482 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    European journal of pediatrics 118 (1974), S. 219-224 
    ISSN: 1432-1076
    Keywords: Cyproheptadin (Nuran®) ; Chemically induced mutagenicity ; Chromosomal damage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Menschliche Lymphocytenkulturen wurden verschiedenen Konzentrationen von Cyproheptadin (0,5×10−4; 1,1×10−4; 2,2×10−4; 4,4×10−4 M) für jeweils 24 und 5 Std vor Ende der Inkubationszeit ausgesetzt und auf induzierte Chromosomenschädigungen untersucht. Bei der Konzentration 4,4×10−4 M sowie bei dem 24 Std-Versuch mit der Konzentration 2,2×10−4 M war die toxische Schädigung so stark, daß nur vereinzelte, zum großen Teil deformierte Zellkerne gefunden wurden. Mit je 300 ausgewerteten Metaphasen konnten nur das 5 Std-Experiment mit 2,2×10−4 M und die niedrigeren Konzentrationen beurteilt werden. Es fand sich keine Erhöhung der Chromosomenschädigungen gegenüber den Kontrollen. Die Ergebnisse werden im Vergleich mit anderen Befunden diskutiert.
    Notes: Abstract Human lymphocyte cultures were exposed to different concentrations of cyproheptadine (0.55×10−4; 1.1×10−4; 2.2×10−4; 4.4×10−4M) for 24 and 5 hrs before the end of incubation time and examined for induced chromosomal damage. With the concentration 4.4×10−4 M, as well as in the 24-hour test with a concentration of 2.2×10−4 M, the toxic damage was so severe that only few, greatly deformed cell nuclei were found. 300 metaphases each for the 5-hour exposure with 2.2×10−4 M and for the lower concentrations could be evaluated. No increase of chromosomal damage was observed in comparison to the controls. These results are discussed in the context of other findings.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Manuscripta mathematica 3 (1970), S. 133-155 
    ISSN: 1432-1785
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Let k be a perfect field of characteristic p≠0; the categoryH of connected abelian Hopf algebras over k is abelian and locally noetherian. Technics of locally noetherian categories are used here to obtain Krull and homological dimensions ofH (which are respectively 1 and 2), and a decomposition ofH in a product of categories. First we have , whereH − is the category of Grassman algebras, andH + consists of Hopf algebras which are zero in odd degrees; then we prove thatH + itself is a product of isomorphic categoriesH n, n∈ℕ*, and we give an equivalence betweenH n and a category of modules. This is compared to some results of algebraic geometry about Greenberg modules.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1974), S. 172-174 
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Acetic acid isolated from cider vinegar and inorganically synthesized glacial acetic acid have markedly different intramolecular isotopic distributions of the stable carbon isotopes. Carbon-12 is concentrated in the methyl group relative to the carboxyl group in the biologically produced acid. The reverse distribution is observed in the particular sample of glacial acetic acid examined here.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The precise isotopic analysis of carbon by means of differential comparison of CO2 samples is applied to neutral, acid c and basic extract fractions of human urine. It is shown that the standard deviation of the analytical procedure, including sample preparation steps, is about 1% or 0.001 atom % excess carbon-13, but depends some what on the fraction considered. Day to day variations (expressed as standard deviations) in the isotopic composition of the urine fractions are generally less than 2.8%, 1.4% and 3.9% for the neutral, acidica and basic fractions, respectively, although the effect of unusual dietary inputs can be recognized. The ingestion of 23 μg excess carbon-13 in the form of isotopically labelled aspirin is shown to perturb significantly the isotopic composition of the acidic urine fraction which, for a 24 hour collection period, had a mass of 570 mg C. Because only 0.01% of the fraction was consumed by isotopic analysis, further extensive analysis would be possible. It is concluded that carbon-13 tracer experiments generally should be arranged to provide at least 5 × 10-5 g excess 13C/g carbon in any fraction which is to be used for lable detection.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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