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  • 1
    Electronic Resource
    Electronic Resource
    Enhancement by caffeine of the frequency of anaphase-telophase chromatin bridges induced by triethylenemelamine (TEM) (1980)
    Springer
    Cellular and molecular life sciences 36 (1980), S. 346-347 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Treatment of BHK cells for 8 h with triethylenemelamine (TEM) followed by caffeine for 4 or 8 h, increased the frequency of anaphase-telophase chromatin bridges in relation to controls and TEM-treated cells. These results indicate that TEM-induced chromosome lesions detected as chromatin bridges at anaphase-telophase could be potentiated by caffeine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01952318
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    Paper (German National Licenses)
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  • 2
    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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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ag-NOR staining and in situ hybridization of rDNA in the chromosomes of the South American camelids (1989)
    Springer
    Genetica 79 (1989), S. 215-222 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The location and frequency of Ag-stained NORs and sites of rDNA hybridization were studied in the chromosomes of the South American camelids. In the four camelids these regions occur distally on chromosomes 18, 21, and 27 and the smallest biarmed elements. Quantitative analysis of NOR distribution showed variations between both cells and species. In llama, guanaco and alpaca the NORs number averaged 6 per cell, this being higher than in vicuña where the average was 3. Relative frequencies of NOR-bearing chromosomes in the four camelids were similar. Yet, in vicuña the virtual absence of NOR sites on one of the smallest biarmed pairs was observed. The rDNA sites assessed in llama and vicuña by in situ hybridization with cloned 18S DNA were coincident with the NOR locations and with the frequencies characteristics for each species. Moreover, varying the exposure time of the autoradiographs, labeling patterns specific for each camelid were observed. Grain counts on individual chromosomes indicated that under our conditions one month exposure is enough to demonstrate all the rDNA sites available in the complement of llama. Conversely, at least two months are necessary to show the total sites existing in vicuña. Most probably this finding reflects the presence of variations in the amount of copies of the ribosomal genes per chromosome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00121515
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    Paper (German National Licenses)
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