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  • Electronic Resource  (4)
  • 1970-1974  (4)
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  • Electronic Resource  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Chromosome replication in cells of a continuous line derived fromAedes albopictus (Skuse) larvae (1972)
    Springer
    Cellular and molecular life sciences 28 (1972), S. 1495-1496 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Resumen El análisis del cuadro de duplicación cromosómica en una linea celular derivada del mosquitoAedes albopictus (Skuse) reveló un período G2 de 3 horas y la presencia de varias areas de duplicación tardía. La mayor parte de estas aread correspondieron a la heterocromatina constitutiva. Sin embargo, la porción distal de ambos brazos en los pares 2 y 3 mostraron duplicación tardía no asociada con la heterocromatina constitutiva. Se sugiere que estas regiones corresponden al a heterocromatina facultative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01957876
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Orderly Arrangement of G-chromosome bands in interphase nuclei (1973)
    Springer
    Cellular and molecular life sciences 29 (1973), S. 1301-1302 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Resumen En las preparaciones cromosómicas sometidas a digestion contripsina se observa que la mayor parte de los nucleos celulares muestran una serie de rayos oscuros que parten de la membrana celular y convergen formando un anillo. Esta imagen se hace presente en aquellos preparados que muestran bandas cromosómicas G y no se observa en aquellos casos con déficit o exceso de digestión enzimática. Estos hallazgos probablemente indican que las bandas G se hallan conectadas, ordenadamente, a la membrana nuclear durante la interfase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01935129
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Polymorphic patterns of heterochromatin distribution in guinea pig chromosomes (1971)
    Springer
    Chromosoma 34 (1971), S. 254-260 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The chromosome complement and patterns of heterochromatin distribution (as demonstrated by the DNA d-r method) were studied from three different guinea pigs. Karyotype analyses showed that one of the females had a heteromorphic sex pair formed by a submetacentric X chromosome and a subterminal X chromosome originated by a shortening of the short arm (x-chromosome). The heterochromatin was mainly found in the pericentromeric areas of the autosomes and X chromosomes and in the short arm of pair 7. The Y chromosome exhibited a degree of heterochromatinization different from that of pericentromeric areas.—The analysis of the heterochromatin distribution in the X chromosomes showed that the smaller size of the heteromorphic x-chromosoine was probably due to a lack of heterochromatin in its short arm. Moreover, two out of the three animals studied had a heteromorphic pattern of heterochromatinization in the pair 21 characterized by heterochromatinization of the pericentromeric area in one chromosome and almost complete heterochromatinization of the other homologue.—It is suggested that most of the heterochromatin disclosed by the DNA d-r method is formed by repetitious DNA; and that the Y chromosome and perhaps some autosome regions in guinea pigs are formed by a type of heterochromatin with properties different from those of the constitutive and facultative heterochromatin (intermediate heterochromatin).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00286151
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Heterochromatin and late replication in the chromosomes of the rat (1973)
    Springer
    Genetica 44 (1973), S. 513-519 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: The distribution of heterochromatin in the chromosomes of the rat was determined by analysing two of its properties: late replication and differential stain with the DNA d-r method. The presence of late and non-late replicating c-heterochromatin in the genome of Rattus norvegicus indicates that this chromatin is an heterogeneous substance exhibiting different properties. Furthermore, the existence of heterochromatin formed by nonrepeated sequences or by sequences with a low degree of repetitiveness is suggested by the presence of late replicating areas which do not react with the DNA d-r method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00116807
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    Paper (German National Licenses)
    Fulltext
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