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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 38 (1982), S. 809-811 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary It was observed that in the fishCoris julis L., in its natural environment, both primary and secondary males take part in reproduction. Chromosome studies showed 23 homologous chromosome pairs, which are identical in males and females, and a variable 24th pair. The heteromorphism of this pair is identical in secondary males and in the majority of females; these are presumably the females that can undergo sex inversion. Primary males show a different heteromorphism of the same pair.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 43 (1987), S. 375-378 
    ISSN: 1420-9071
    Keywords: Human gene therapy ; medical and ethical issues ; hereditary diseases ; gene transfer systems ; in vitro fertilization ; embryo transfer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Gene therapy provides new options for medicine, and implies new responsibilities for making decisions relating to the limitations which reason and morality impose upon manipulation of the human genome for the benefit both of patients and of society. This contribution outlines the possibilities and limits of gene therapy in man from a medico-technical viewpoint.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 44 (1988), S. 169-171 
    ISSN: 1420-9071
    Keywords: Dysplastic naevus syndrome ; DNA-repair ; cancer genes ; familial malignant melanoma ; monoclonal antibodies specific for UV-dimers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Dysplastic naevus syndrome (DNS) is frequently observed in association with familial melanoma and xeroderma pigmentosum (XP), but the role of UV-light in the development of DNS has not been elucidated. Previous work has shown that UV-induced unscheduled DNA synthesis is associated with the early loss of antigenicity observed in immunoassays using a monoclonal antibody specific for thymine-thymine dimers. We now show that the rate of loss of antigenicity, which reflects the relative amount of bound antibody, observed during the first 60 min following 10 Jm−2 UVC irradiation is significantly reduced (p=0.02) in cultures of fibroblasts from 7 out of 8 DNS patients compared with the results from cells of a group of 30 healthy volunteers. This observation suggests an early event in excision repair is altered in the majority of DNS patients.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Human genetics 〈Berlin〉 64 (1983), S. 363-370 
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The sizes and staining intensities of the nucleolus organizer regions (NORs) in human spermatogenesis were studied qualitatively and quantitatively with the silver (Ag)-staining technique. The Ag-stainability of the NORs is a measure of the transcriptional activity of the ribosomal RNA genes. Ag-stained NORs are present during the whole period of meiotic prophase up to pachytene and totally absent in the two meiotic metaphases. In the early spermatids the Ag-stainability of the NORs reappears and persists up to the beginning of the elongation phase of the nuclei. This pattern of NOR-activity during spermatogenesis is common for all vertebrates. However, in human spermatogenesis the absolute sizes of the NORs in the pre- and postmeiotic stages as well as the interphase arrangement of the postmeiotically reactivated NORs show characteristic properties not found in any other species. The cytochemistry of the argentophilic material, the significance of the synthesis of ribosomal RNA in spermatogenesis, and the characteristic arrangement of the Ag-stained NORs in the spermatids are discussed.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 39 (1983), S. 201-202 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The karyotypes ofDendrocopos major andD. medius show a gradual transition from macro- to microchromosomes and a high diploid chromosome number. The Z-chromosome is the largest element.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 73 (1986), S. 671-672 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Human genetics 〈Berlin〉 14 (1971), S. 33-43 
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung 4754 Lymphocytenmetaphasen von 36 männlichen und weiblichen Frühgeborenen, Neugeborenen und Kleinkindern wurden nach dem Vorkommen von numerischen und strukturellen Aberrationen, von Assoziationen und sichtbaren Satelliten der akrozentrischen Chromosomen untersucht, wobei wir die Zellkulturen, die wir nach einer Mikromethode nach Hirschhorn durchführten, nach 48 und 72 Std Kulturzeit abbrachen. Aneuploidie. Wir beobachteten in 1,87% sämtlicher untersuchter Zellen eine abnorme Chromosomenzahl. Bei den einzelnen Individuen kamen aneuploide Kerne zwischen 0 und 5% vor, ohne daß ein Unterschied zwischen den Altersgruppen, den Geschlechtern oder den Kulturzeiten bestand. Strukturelle Abnormalitäten. Sie traten in 4,75% aller untersuchten Mitosen, bei den einzelnen Probanden zwischen 1 und 8% auf, wobei Gaps am häufigsten auf den Chromosomen der gruppe D, Brüche auf denen der Gruppe A gefunden wurden. Die Altersgruppen, die Geschlechter, die Präparate der verschiedenen Kulturzeiten und Serien unterschieden sich im Vorkommen von Strukturabnomalitäten nicht voneinander. Assoziationen der akrozentrischen Chromosomen. Ihr Vorkommen ist abhängig von: Individuum, Altersgruppe, Kulturzeit. In einer Altersgruppe für eine bestimmte Kulturzeit charakterisiert ihre Häufigkeit ein Individuum. Satelliten. Sowohl die Häufigkeit der D-Satelliten wie auch die der G-Satelliten ist für ein Individuum charakteristisch. Ihr Vorkommen bei einem Probanden war bei beiden Kulturzeiten gleich.
    Notes: Summary 4754 lymphocyte metaphases of 36 male and female premature babies, new-born babies and infants were analyzed for the occurrence of numeric and structural chromosome aberrations, of associations and visible satellites of the acrocentric chromosomes. The cell cultures were done after a micro-method according to Hirschhorn and were interrupted after 48 and 72 hrs of culturing. Aneuploidy. 1.87% of all the cells analyzed showed an abnormal number of chromosomes. In the single individual aneuploidic nuclei occurred between 0 and 5% without there being a difference in group of age, sex or time in culture. Structural Abnormalities. In 4.75% of the total number of mitoses analyzed, and between 1to 8% in the single individual, structural abnormalities were recorded. Gaps were found most frequently in chromosomes of group D, breaks in those of group A. The difference between age-groups,sexes, culturing time and culture series has no significance for the occurrence of structural abnormalities. Associations of Acrocentric Chromosomes. Their occurrence depends on the individual, the age-group and the time in culture. Within one age-group with a certain culturing time, an individual is characterized by their occurrence. Satellites. The frequency of D-satellites as well as of G-satellites is characteristic of an individual. Their occurrence with one subject remained the same for both culture periods.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 41 (1985), S. 1515-1517 
    ISSN: 1420-9071
    Keywords: Human IVF-ET ; human sterility ; bioethics ; medical issues ; legislation ; research
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 9
    Publication Date: 1983-02-01
    Print ISSN: 0014-4754
    Topics: Biology , Medicine
    Published by Springer
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  • 10
    Publication Date: 1987-04-01
    Print ISSN: 0014-4754
    Topics: Biology , Medicine
    Published by Springer
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