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  • 1
    Electronic Resource
    Electronic Resource
    The structure and behavior of the nucleolus organizers in mammalian cells (1967)
    Springer
    Chromosoma 23 (1967), S. 137-153 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The regularly occurring secondary constrictions on metaphase chromosomes of mammalian cells prove to be nucleolus organizers as expected. The expression of nucleolus organizers as secondary constrictions, however, varies from cell to cell and from tissue to tissue, including cultivation in vitro. Electron micrographs of the organizer region show that the nucleolus organizer at metaphase is not a constriction. The width of the organizer area is the same as the condensed chromosomal arms; but the filaments, which are the major components of this region, show a diameter of 50–70 Å. The condensed chromosome arms consist of filaments 150–200 Å in diameter. In some mammalian species, structures similar to the nucleolus organizer are located at the end of chromosomes. These may be terminal nucleolus organizers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331109
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Sister chromatid differential staining pattern in prematurely condensed chromosomes (1976)
    Springer
    Cellular and molecular life sciences 32 (1976), S. 917-919 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Application of sister chromatid differential (SCD) procedure on G1, S and G2 prematurely condensed chromosomes (PCC) of cells in the second and third cycle of DNA replication in medium containing BrdU reveals differential staining patterns characteristic of their respective stages in the cell cycle. These findings also suggest a structural similarity between PCC and metaphase chromosomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02003766
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Cytological analyses of a 14p+variant by means of N-banding and combinations of silver staining and chromosome bandings (1979)
    Springer
    Human genetics 〈Berlin〉 46 (1979), S. 75-82 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An inherited human karyological variant (14p+) has been studied with a number of cytochemical techniques. The short arm of this variant chromosome 14 is nearly as long as the long arm, giving the chromosome a submetacentric to metacentric appearance. In conventionally Giemsa-stained preparations, a maximum of three secondary constrictions can be observed in the marker arm. The secondary constrictions are silver-positive in Ag-NOR preparations. However, the entire arm stains deeply in N-banded preparations. The 14p+ arm also Q-negative, C-negative, G-negative, and R-positive with an almost homogeneous texture. The difference between N-banding and silver staining is interpreted as the result of gene activities of the ribosomal cistrons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00278904
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    Paper (German National Licenses)
    Fulltext
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