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  • Electronic Resource  (15)
  • 1985-1989  (4)
  • 1970-1974  (4)
  • 1965-1969  (7)
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  • Electronic Resource  (15)
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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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  • 2
    Electronic Resource
    Electronic Resource
    Location of secondary constrictions in the chromosomes of rattus norvegicus (1966)
    Springer
    Naturwissenschaften 53 (1966), S. 590-591 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00600550
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  • 3
    Electronic Resource
    Electronic Resource
    The pattern of restriction enzyme-induced banding in the chromosomes of chimpanzee, gorilla, and orangutan and its evolutionary significance (1985)
    Springer
    Journal of molecular evolution 22 (1985), S. 323-333 
    Details
    ISSN: 1432-1432
    Keywords: Pongidae ; Chromosome ; Karyotype ; Restriction enzymes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The pattern of banding induced by five restriction enzymes in the chromosome complement of chimpanzee, gorilla, and orangutan is described and compared with that of humans. The G banding pattern induced by Hae III was the only feature common to the four species. Although hominid species show almost complete chromosomal homology, the restriction enzyme C banding pattern differed among the species studied. Hinf I did not induce banding in chimpanzee chromosomes, and Rsa I did not elicit banding in chimpanzee and orangutan chromosomes. Equivalent amounts of similar satellite DNA fractions located in homologous chromosomes from different species or in nonhomologous chromosomes from the same species showed different banding patterns with identical restriction enzymes. The great variability in frequency of restriction sites observed between homologous chromosome regions may have resulted from the divergence of primordial sequences changing the frequency of restriction sites for each species and for each chromosomal pair. A total of 30 patterns of banding were found informative for analysis of the hominid geneaalogical tree. Using the principle of maximum parsimony, our data support a branching order in which the chimpanzee is more closely related to the gorilla than to the human.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02115688
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  • 4
    Electronic Resource
    Electronic Resource
    Deuteron photodisintegration between 100 MeV and 255 MeV (1986)
    Springer
    Czechoslovak journal of physics 36 (1986), S. 290-295 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01597161
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  • 5
    Electronic Resource
    Electronic Resource
    Complement with 38 chromosomes in two south American populations ofRattus rattus (1969)
    Springer
    Cellular and molecular life sciences 25 (1969), S. 1111-1112 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Resumen Se estudiaron los cromosomas de 16 ejemplares deRattus rattus provenientes de la Provincia de Buenos Aires (Argentina) y del Estado de Rio Grande do Sul (Brasil). En todos los animales el complemento estuvo formado por 38 cromosomas. Considerando que en las ratas el complemento de 42 cromosomas es probablemente el mas generalizado, se sugiere que el complemento de 38 cromosomas ha derivado del de 42 mediante un proceso de reordenamiento cromosómico con fusión céntrica.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01901465
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  • 6
    Electronic Resource
    Electronic Resource
    Karyological conservatism in South American camelids (1986)
    Springer
    Cellular and molecular life sciences 42 (1986), S. 622-624 
    Details
    ISSN: 1420-9071
    Keywords: Karyological conservatism ; camelids ; camelids karyology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Llama, guanaco, vicuna and alpaca show similar diploid numbers, gross chromosomal morphology and homologous G, C and NOR banding patterns. This chromosomal homology is also found in the two-humped camel and very probably in the one-humped camel as well. These findings indicate that the camelid karyotype can probably be traced back to early Miocene times. This probably represents the most extreme case of chromosomal conservatism among mammals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01955563
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  • 7
    Electronic Resource
    Electronic Resource
    The occurrence of an intermediate didelphid karyotype in the short-tailed opossum (GenusMonodelphis) (1969)
    Springer
    Cellular and molecular life sciences 25 (1969), S. 1210-1211 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Resumen Se han estudiado los cromosomas de dos especies de didélfidos del géneroMonodelphis: M. brevicaudata palliolata del norte de Venezuela yM. dimidiata de la Prov. de Buenos Aires, Argentina. Ambas especies tienen un cariotipo muy similar, compuesto de 18 cromosomas. Este cariotipo es intermedio entre el que presentanCaluromys yMarmosa (2n=14) y el deDidelphis, Philander yLutreolina (2n=22). Se postula la fisión céntrica en dos pares de submetacentricos del primer tipo, para explicar el origen del cariotipo deMonodelphis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01900283
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  • 8
    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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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Chromosome replication in four species of snakes (1969)
    Springer
    Chromosoma 26 (1969), S. 188-200 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Chromosome measurements were performed in four species of snakes related at the level of suborder (Boa constrictor amarali, Xenodon merremii, Philodryas patagoniensis, Bothrops jararaca). The data obtained point out that pairs 1–3 were common to the four snakes and probably inherited from the ancestor of the suborder Serpentes. Pairs 5–8-W were characteristic of each snake; hence, it is possible to assume that they followed evolving after the appearing of the suborder Serpentes. Z-chromosomes were metacentric in B. constrictor amarali, X. merremii and B. jararaca and slightly submetacentric in P. patagoniensis. Area of these chromosomes varied from 8.6–10.6% of the haploid set in the four species studied.-The study of chromosome replication at the end of the S period points out that “shared chromosomes” have similar patterns of labeling. Therefore, it is proposed that the distribution of late replicating regions and heterochromatin in the genome is phylogenetically transmitted and probably genetically determined.—The analysis of the ending-sequence of chromosome replication shows that sex chromosomes finish earlier than macroautosomes. It is concluded that snakes probably have no mechanism of sex chromosome heterochromatinization in either sex. The absence of late replicating Z-chromosome in the males, favours the hypothesis that no mechanism of sex dosage compensation is acting in the suborder Serpentes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00326454
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