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  • 1970-1974  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Selection for genetically repressible (ArgR+) strains of Escherichia coli K12 from genetically derepressed (ArgR-) mutants using acetylnorvaline (1974)
    Springer
    Molecular genetics and genomics 132 (1974), S. 131-136 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The growth of E. coli K12 strains derepressed for N-α-acetyl-L-ornithinase (the argE gene product) is inhibited by 25 mg/ml N-α-acetyl-DL-norvaline. This is due to deacetylation of acetylnorvaline by acetylornithinase yielding norvaline which inhibits growth. A genetically repressible (argR +) strain (514) in which acetylornithinase is repressed is resistant. Thus, acetylnorvaline resistance can be used to select argR + recombinants and transductants from a genetically derepressed (argR -) strain (514-1). ArgR - strains lacking acetylornithinase activity are resistant to acetylnorvaline. Strain 514-1-34 (argR -) which is completely deleted for argE is resistant. Also, of 52 spontaneous acetylnorvaline-resistant mutants derived from strain 514-1, 45 were argE -.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00272178
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  • 2
    Electronic Resource
    Electronic Resource
    Zur Reaktion von Aziridiniumsalzen mit N-Cyanverbindungen (1974)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 316 (1974), S. 223-234 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Quartäre Aziridiniumsalze reagieren in einer 1,3-polaren Cycloaddition mit Cyanguanidinen, Cyanamid, Cyanamidinen, Cyanthioharnstoffen und β-Enaminonitrilen zu in 2-Stellung substituierten Imidazoliniumsalzen 6, 11, 13, 17 und 19. Guanidino- und Amidino-substituierte Imidazoliniumsalze bilden stabile Kupferkomplexe. Eine Zuordnung möglicher Strukturen gelingt mit Hilfe der IR-Spektroskopie.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19743160208
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    Paper (German National Licenses)
    Fulltext
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