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  • Articles: DFG German National Licenses  (5)
  • 1970-1974  (5)
Source
  • Articles: DFG German National Licenses  (5)
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Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Biological Sciences: Meiotic DNA Synthesis (1971)
    [s.l.] : Nature Publishing Group
    Nature 230 (1971), S. 182-185 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We report here the incorporation of tritiated thymidine into chromosomes occurred at most, and possibly all, stages of meiosis. We used the cultivated wheat (Triticum aestivum variety 'Chinese Spring' 2n = 6x = 42) and an understanding of the results requires some knowledge of the duration of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/230182a0
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Chromatin attachment to nuclear membrane of wheat pollen mother cells (1974)
    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 395-396 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Recently there has been increased interest in premeiotic development in wheat5 and it has become clear that activities occurring during premeiotic interphase are critical to chromosome alignment6,7. As such alignment might be effected by a structural mechanism we undertook a preliminary ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/252395a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Natural variation in nuclear characters of meristems in Vicia faba (1970)
    Springer
    Chromosoma 29 (1970), S. 317-335 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The natural variation in chromosome size in root-tip and shoot apex meristems of Vicia faba has been studied. Chromosomes in main root-tips of one week old plants are 2–3 times larger than those in small lateral root-tips of 3 week old plants. While the nuclear DNA content remains constant, the nuclear RNA and nuclear histone contents show a positive linear correlation with chromosome volume. The DNA: histone ratio varies and is lowest in cells with large chromosomes. Nuclear volume and chromosome volume are not linearly related and changes in nuclear density therefore seem likely. A positive linear relationship between chromosome volume and mitotic index in colchicined squashes is demonstrated. The results strongly suggest that variation in chromosome size indicates a corresponding change in the rate of cell metabolism and may well reflect change in genetic activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325946
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Genome size and the proportion of repeated nucleotide sequence DNA in plants (1974)
    Springer
    Biochemical genetics 12 (1974), S. 257-269 
    Details
    ISSN: 1573-4927
    Keywords: DNA ; repeated sequences ; plant DNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The reannealing kinetics of denatured DNA fragments from 23 species of higher plants have been studied, using hydroxylapatite chromatography to distinguish reannealed from single-stranded DNA. The 2C nuclear DNA contents of the species varied between 1.7 and 98 pg. The proportions of DNA in species with a nuclear DNA mass above 5 pg that reannealed with the kinetics of sequences present in more than 100 copies were high (69–92% with a mean of 80±2.0%). For species with less than 4 pg of DNA, the mean proportion of repeated-sequence DNA was 62±2.9%. It is concluded that most of the variation in nuclear DNA mass in higher plant chromosomes can be accounted for by variation in repeated-sequence DNA. The consequences of altering the adapted DNA content of a species by the addition of families of repeated sequences are discussed in relation to the proportion of repeated-sequence DNA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00485947
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Normal and abnormal meiosis in a partially male-sterile sugar-beet (Beta vulgaris L.) (1973)
    Springer
    Euphytica 22 (1973), S. 114-120 
    Details
    ISSN: 1573-5060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The duration of meiosis at 20°C was about 24 hours in Beta vulgaris L. cv. Sharpes Klein monogerm. While timing meiosis some plants were found with aberrant meiotic and tapetal development. The abnormalities are described and compared with abnormal anther development in B. vulgaris previously noted by other workers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00021562
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    Paper (German National Licenses)
    Fulltext
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