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  • 1
    Digitale Medien
    Digitale Medien
    s.l. : American Chemical Society
    Biochemistry 21 (1982), S. 3721-3728 
    ISSN: 1520-4995
    Quelle: ACS Legacy Archives
    Thema: Biologie , Chemie und Pharmazie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 1520-4995
    Quelle: ACS Legacy Archives
    Thema: Biologie , Chemie und Pharmazie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Mycopathologia 67 (1979), S. 17-24 
    ISSN: 1573-0832
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract Yeast and mycelial forms of several strains of Histoplasma capsulatum have been analysed with respect to their ability to grow on a defined medium with or without the amino acid supplement. It appeared that whereas mycelial cells of all strains tested were prototrophic, the yeast cells of most strains stringently required L-cysteine for growth. This was due to the absence from these cells of an active form of an enzyme, sulfite reductase, normally needed for cysteine biosynthesis. We have found that the yeast cells of two strains (Downs and G 184 B) can grow without cysteine supplement if L-serine is added to the medium. These cells have an active sulfite reductase but the enzyme disappears when cysteine is added. Thus, the regulation of sulfite reductase is different in mycelium and yeast — the enzyme is constitutive or repressible, respectively. Examination of RNA synthetic components of H. capsulatum revealed that the major proportion of RNA polymerase of the yeast form is sensitive to inhibition by α-amanitin. The sensitivity to the toxin disappears completely upon conversion to mycelial phase. The yeast cells possess an unusual enzyme capable of synthesizing oligonucleotides without the aid of a DNA template. The enzyme stimulates DNA synthesis in the reaction catalyzed by DNA polymerase from H. capsulatum or Escherichia coli. The above data are discussed in terms of regulatory mechanisms involved in the process of morphological conversion. It is proposed that efforts be directed toward the identification and isolation of specific gene products so that qualitative and quantitative analysis of the conversion could be carried out.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Journal of clinical immunology 7 (1987), S. 24-28 
    ISSN: 1573-2592
    Schlagwort(e): Poly(A) polymerase antibodies ; autoimmune diseases ; liver and hepatoma poly(A) polymerase ; nuclear antigens
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Sera from 53 patients, 26 with systemic lupus erythematosus (SLE), 8 with rheumatoid arthritis (RA), 9 with Sjogren's syndrome (SS), and 10 with scleroderma (Scl), were screened for the presence of antibodies against liver-type poly(A) polymerase and tumor-type poly(A) polymerase. Sixty percent of the patients with the above four autoimmune diseases have antibodies directed against liver poly(A) polymerase, whereas sera from 74% of the patients contained anti-hepatoma poly(A) polymerase antibodies. About 25% of the patients produced antibodies exclusively against the tumor poly(A) polymerase. IgG containing anti-liver or anti-tumor poly(A) polymerase antibodies inhibited the activity of the respective enzyme. IgG containing antibodies against liver and tumor enzymes inhibited the activity of both enzymes, whereas IgG from sera that did not react with poly(A) polymerase had no effect on either enzyme. These data demonstrated the specificity of these autoantibodies and confirmed the results of the radioimmunoassay.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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