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  • 1
    Electronic Resource
    Electronic Resource
    Karotype and Revised Chromosome Number of Amphiuma (1963)
    [s.l.] : Nature Publishing Group
    Nature 199 (1963), S. 1207-1208 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. Late prophase of mitosis in Amphiuma testis Fig. 2. Karyotype of Amphiuma means tridactylum constructed from Fig. 1 An examination of the karyotype (Fig. 2) reveals that the set is composed chiefly of submedian chromosomes. The largest chromosome in fully contracted metaphases has an ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1991207b0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Relative X-Ray Sensitivity of Metaphase and Interphase Chromosomes (1948)
    [s.l.] : Nature Publishing Group
    Nature 162 (1948), S. 651-652 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MANY investigators have studied the problem of radio-sensitivity of cells in different stages of mitosis and meiosis in a wide range of plants and animals. Much disagreement still exists, however, as to which stages of the nuclear cycle are stages of high sensitivity to chromosome breakage and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/162651b0
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  • 3
    Electronic Resource
    Electronic Resource
    Genetic response ofAntirrhinum majus to acute and chronic plant irradiation (1958)
    Springer
    Molecular genetics and genomics 89 (1958), S. 7-13 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Clonal lines ofAntirrhinum majus heterozygous for flower color have been used to study somatic mutations induced by irradiating plants with chronic gamma rays from cobalt-60 and acute X rays. Pink or white flecks and sectors of various sizes on the purple flowers are interpreted as resulting from mutational events at different times in flower development. Acute X-ray treatment of pre-flowering stages caused no visible change in flowers opening prior to the 15th day thereafter. On the 16th to 19th days there was dense mottling, and by the 20th or 21st day numerous eight-cell mutant spots could be counted. The number of spots induced by 1,000 r of X rays was used to obtain a preliminary estimate of an average mutation rate for the three genes studied of 6.33×10−6 per cell per roentgen. Chronic irradiation in a gamma radiation field and greenhouse showed a linear response of mutation rate to daily dose rate, the actual rate being subject to seasonal variation. There were occasional indications of non-linearity but further tests have failed to show any significantly higher mutagenic efficiency of dose rates below 6 r/day. In plants removed from chronic gamma irradiation the frequency of mutation spots returns to the spontaneous level after about six weeks. The appearance, however, of mutant sectors on plants several months after exposure to both acute and chronic radiation indicates the induction of persistent genetic changes. Progeny tests of seeds and cuttings are planned to test the nature of these genetic events.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00888497
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    Paper (German National Licenses)
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