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  • 1
    Digitale Medien
    Digitale Medien
    Linkage Disequilibrium in Natural Populations of Trypanosoma cruzi (Flagellate), the Agent of Chagas’ Disease (1988)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 35 (1988), S. 0 
    Details
    ISSN: 1550-7408
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: . We have studied linkage disequilibrium in natural populations of Trypanosoma cruzi, the agent of Chagas’ disease, by analyzing (i) a set of 524 stocks from the whole geographical range of the parasite, characterized at four gene loci coding for enzymes; (ii) a subsample of 121 stocks characterized at 12 enzyme loci; and (iii) a subset of 386 stocks from six locations in Bolivia, characterized by four enzyme loci. Our results show that the linkage disequilibrium reaches the maximum possible value, given the observed allelic frequencies, for almost all the locus pairs. This result is most consistent with the hypothesis that genetic recombination is absent or very rare in T. cruzi natural populations. Partition of the linkage disequilibrium variance for the six Bolivian populations shows that both inter- and intrapopulation components are substantial and that the relationships among the components are DIS2 〈 DST2, and D'IS2 〈 D'ST2. These inequalities are interpreted as the result of an interplay between genetic drift, rare or absent mating, and clonal selection in generating linkage disequilibrium in T. cruzi populations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1550-7408.1988.tb04081.x
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  • 2
    Digitale Medien
    Digitale Medien
    Theodosius Dobzhansky: The Man and the Scientist (1976)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Genetics 10 (1976), S. 1-7 
    Details
    ISSN: 0066-4197
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.ge.10.120176.000245
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  • 3
    Digitale Medien
    Digitale Medien
    Frequency-Dependent Selection (1974)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Ecology, Evolution, and Systematics 5 (1974), S. 115-138 
    Details
    ISSN: 0066-4162
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.es.05.110174.000555
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  • 4
    Digitale Medien
    Digitale Medien
    Extinction of taxa and Van Valen's law (1975)
    [s.l.] : Nature Publishing Group
    Nature 257 (1975), S. 514-515 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] VAN VALENI has proposed an evolutionary law that has attracted considerable attention2"6. He showed that plots of survivorship of taxa as a function of age are commonly log-linear (see Fig. 1 of ref. 1). This he interpreted to mean that the probability of extinction of a taxon is independent of its ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/257514b0
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  • 5
    Digitale Medien
    Digitale Medien
    Satellite DNA sequences and reproductive isolation in theDrosophila willistoni group (1980)
    Springer
    Cellular and molecular life sciences 36 (1980), S. 837-839 
    Details
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Satellite DNAs of theDrosophila willistoni group have been analyzed by Hae III endonuclease digestion. Differences were observed between the 2 speciesD. willistoni andD. paulistorum and also between semispecies ofD. paulistorum and, to a lesser extent, between subspecies ofD. willistoni. Differences did not appear to be consistently greater between strains producing sterile hybrid males than between those producing fertile hybrids.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01978600
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  • 6
    Digitale Medien
    Digitale Medien
    High genetic variability in a population of Tridacna maxima from the Great Barrier Reef (1975)
    Springer
    Marine biology 33 (1975), S. 341-345 
    Details
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A population of the bivalve mollusk Tridacna maxima (Röding) from Hron Island, Great Barrier Reef, Australia, was studied by gel electrophoresis, and proved to be highly variable genetically, with an average heterozygosity of about 22%. This compares closely with a population of T. maxima from Enewetak (Eniwetok) Atoll, with an average heterozygosity of about 20%, very high for marine organisms. Enewetak Atoll was the site of a series of nuclear tests. The Heron Island study verifies that the high variability is natural, and supports the hypothesis that species from trophically stable environments tend to be highly variable genetically.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00390572
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  • 7
    Digitale Medien
    Digitale Medien
    Wineries, drosophila, alcohol, and Adh (1980)
    Springer
    Oecologia 47 (1980), S. 141-144 
    Details
    ISSN: 1432-1939
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Previous workers (McKenzie and Parsons, 1972, 1974; McKenzie, 1974; Briscoe et al., 1975) have found anomalous distributions of species of Drosophila, of sexes of D. melanogaster, and of Adh alleles in and around wineries in Australia and Spain. Field studies in California's Sonoma Valley provide evidence that the explanations advanced for these distributions may incorrect. The anomalous distribution of species was attributed to alcohol, either as a selective agent or as a behavioral stimulus. We find a virtually identical species distribution in the absence of environmental alcohol. The anomalous sex ratio was attributedd to differential survivall of the sexes when raised on alcohol. We present crude evidence thatehe difference may simply be a behavioral response to some product of fermentation, which need not be alcohol. Finally, the allele frequency difference reported from Spain was attributed to differential adult mortality on alcohol. We do not find an allele frequency difference even when alcohol is exposed, and therefore suggest that selection is occurring in pre-adult stages.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00541790
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  • 8
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    Unbekannt
    SANCHO IZQUIERDO (MIGUEL): "Tratado elemental de Filosofía del Derecho y principios de Derecho natural" (Book Review) (1943)
    Madrid : Periodicals Archive Online (PAO)
    Revista de filosofía. 2:5 (1943:abr./jul.) 383 
    Details
    ISSN: 0034-8244
    Thema: Philosophie
    Notizen: BIBLIOGRAFIA
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4174-1943-002-05-000008
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  • 9
    Digitale Medien
    Digitale Medien
    Invalidation of Principle of Competitive Exclusion Defended (1970)
    [s.l.] : Nature Publishing Group
    Nature 227 (1970), S. 89-90 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] In the competition between species of Paramecium, P. aurelia lived predominantly in the upper layer of the liquid medium and fed mostly on bacteria, while P. bursaria lived preferentially in the bottom layer and fed on yeast. There was therefore only a slight mutual depression between the species. ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/227089b0
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  • 10
    Digitale Medien
    Digitale Medien
    Genetic polymorphism: from electrophoresis to DNA sequences (1983)
    Springer
    Cellular and molecular life sciences 39 (1983), S. 813-823 
    Details
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Recent studies indicate that the amount of protein variation undetected by electrophoresis may be reasonably small. Nevertheless, at the protein level, a typical sexually-reproducing organism may be heterozygous at 20 or more percent of the gene loci. Although the evidence is limited, it appears that at the level of the DNA nucleotide sequence every individual is heterozygous at every locus — if introns as well as exons are taken into account. The evidence available does not support the hypothesis that, at least at the protein level, the variation is adaptively neutral.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01990397
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