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  • 1970-1974  (4)
Document type
Publisher
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Year
  • 1
    Electronic Resource
    Electronic Resource
    On approximate identities in abstract, measure spaces (1970)
    Springer
    Monatshefte für Mathematik 74 (1970), S. 289-301 
    Details
    ISSN: 1436-5081
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01302696
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Location of the genes for 5S ribosomal RNA in Xenopus laevis (1973)
    Springer
    Chromosoma 42 (1973), S. 191-203 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract In situ hybridization of 5S RNA and cRNA transcribed in vitro from Xenopus laevis 5S DNA shows that 5S DNA is localized at or near the telomere region of the long arm of many, if not all, of the X. laevis chromosomes. No 5S DNA is detected near the nucleolus organizer in the normal X. laevis chromosome complement, but in a X. laevis kidney cell line, 5S DNA is found at the distal end of the secondary constriction. The arrangement of 5S DNA in several types of interphase nuclei is described. — During the pairing stages of meiosis the telomeres of most or perhaps all of the chromosomes become closely associated so that the regions containing 5S DNA form a single cluster. This close association might be either a cause or a result of the presence of the similar sequences of 5S DNA on many telomeres. It suggests that the uniformity of 5S sequences on non-homologous chromosomes might be maintained by crossing-over between the chromosomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00320940
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A timing study of DNA amplification in Xenopus laevis oocytes (1971)
    Springer
    Chromosoma 35 (1971), S. 300-309 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The time course of meiotic amplification of nucleolar DNA in Xenopus laevis oocytes has been studied autoradiographically. We find that the process is first detectable in zygotene nuclei less than 7 days after the end of premeiotic S-phase. It is completed 3 1/2 weeks later, towards the end of pachytene. Premeiotic S-phase lasts for 1–2 weeks. We are not certain whether it is followed by a short G2 or whether leptotene commences immediately. Leptotene lasts for 5±2 days, zygotene for 7±2 days and pachytene for about 20 days before the oocyte gradually enters the extended diplotene stage. Various molecular mechanisms for amplification are discussed in the light of a 24±3 day amplification time. All are found to be potentially capable of amplifying sufficient nucleolar DNA in the time available.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00326280
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Circadian periodicity of plasma cortisol levels: Effect of random living schedule in man (1971)
    Springer
    Origins of life and evolution of the biospheres 3 (1971), S. 125-134 
    Details
    ISSN: 1573-0875
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Six normal subjects lived for two weeks on disorganized schedules in which they were in bed for four 2-h periods per day at random intervals. Meals were also served on a random schedule. Subjects varied in their ability to adapt their sleep to such schedules. One subject achieved an excellent adaptation, one very good, and two fairly good. Circadian periodicity of plasma corticosteroid levels was not greatly affected by the experiment, but became ‘noisier’ in most subjects, possibly because of irregularity of individual cortisol secretory episodes within the circadian cycle. The results do not encourage the belief that circadian adrenal periodicity depends upon the cumulative effects of regular living schedules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00927987
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    Paper (German National Licenses)
    Fulltext
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