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  • 1
    Electronic Resource
    Electronic Resource
    Oestrogen receptor levels and vitellogenin synthesis during development of Xenopus laevis (1981)
    [s.l.] : Nature Publishing Group
    Nature 292 (1981), S. 853-855 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We first measured receptor levels in salt extracts of liver nuclei from untreated and oestrogen-treated larvae at six different stages during metamorphosis, using methods6 which maximize the yield of soluble receptor from adult liver nuclei, but which would not extract any insoluble receptor. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/292853a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Messenger RNA for the coat protein of tobacco mosaic virus (1976)
    [s.l.] : Nature Publishing Group
    Nature 260 (1976), S. 759-764 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] TMV RNA is not an efficient template for translation of the viral coat protein, in spite of containing nucleo-tide sequences coding for the protein. Efficient translation requires the prior synthesis within infected cells of a smaller RNA carrying only a portion of the information encoded in the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/260759a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The number and activity of ribosomal RNA genes in Xenopus laevis embryos carrying partial deletions in both nucleolar organizers (1972)
    Springer
    Biochemical genetics 6 (1972), S. 65-73 
    Details
    ISSN: 1573-4927
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The number of ribosomal RNA genes and the rate of ribosomal RNA synthesis have been analyzed in a mutant of Xenopus laevis carrying two partial nucleolar organizers (p 1−1/p1−2 nu). The p 1−1 and p 1−2 nucleolar organizers have fewer ribosomal RNA genes than the normal (+ nu) organizer, and each produces a smaller nucleolus than the + nu organizer in heterozygous embryos (+/p 1−1 and +/p 1−2). These heterozygotes develop normally and synthesize ribosomal RNA at normal rates. The p 1−1/p1−2 nu mutants die at an early stage of development, and they synthesize ribosomal RNA at only 50% of the normal rate even though they have 70% of the haploid number of ribosomal RNA genes. These results show that the ribosomal RNA genes contained in a partial nucleolar organizer are not transcribed with the same efficiency as those found in an intact organizer and suggest the existence of genes, within the nucleolar organizer, which control the transcription of ribosomal RNA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00485967
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    Paper (German National Licenses)
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