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  • 1
    Electronic Resource
    Electronic Resource
    High-frequency genomic rearrangements involving archaebacterial repeat sequence elements (1982)
    [s.l.] : Nature Publishing Group
    Nature 299 (1982), S. 182-185 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 a, Experimental protocol. A single cell of H. halobium wild-type strain NRC-1 was plated to give a single colony (25 generations), and cultured in liquid for a further nine generations. Most of this culture was used to prepare DNA taken to be representative of the first 'parental' cell ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/299182a0
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  • 2
    Electronic Resource
    Electronic Resource
    Variation in the reversibility of evolution (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 408 (2000), S. 463-466 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] How reversible is adaptive evolution? Studies of microbes give mixed answers to this question. Reverse evolution has been little studied in sexual populations, even though the population genetics of sexual populations may be quite different. In the present study, 25 diverged replicated ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35044070
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  • 3
    Electronic Resource
    Electronic Resource
    Ecological outbreak dynamics and the cusp catastrophe (1981)
    Springer
    Acta biotheoretica 30 (1981), S. 229-253 
    Details
    ISSN: 1572-8358
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Many ecological processes exhibit trajectories which can be suitably represented by stable equilibria or smooth limit cycles. However, a third kind of ecological process involves intermittent, abrupt, and drastic changes in densities, here termed ‘outbreak dynamics’, which require different modelling frameworks. One such framework, the cusp catastrophe, is used here in a modelling study of a particular outbreak insect, the forest tent caterpillar. This model is then generalized to cover a set of related ecological systems. The particular form of the model for each system depends on whether the major controlling ecological variables are externally imposed, or are incorporated in the model equations. It is concluded that the simple cusp catastrophe is an appropriate metaphor for understanding outbreak dynamics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00051769
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of superoxide dismutase alleles on aging inDrosophila (1993)
    Springer
    Genetica 91 (1993), S. 143-149 
    Details
    ISSN: 1573-6857
    Keywords: superoxide dismutase ; aging ; Drosophila ; evolutionary genetics ; senescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of superoxide dismutase on aging were tested using two differt experimental approaches. In the first, replicated populations with postponed aging were compared with their controls for frequencies of electrophoretic alleles at the SOD locus. Populations with postponed aging had consistently greater frequencies of the allele coding for more active SOD protein. This allele was not part of a segregating inversion polymorphism. The second experimental approach was the extraction ofSOD alleles from different natural populations followed by the construction of differentSOD genotypes on hybrid genetic backgrounds. This procedure did not uncover any statistical effect ofSOD genotype on hybrid genetic backgrounds. This effects on longevity and fecundity due to the family from which a particularSOD genotype was derived. To detect the effects ofSOD genotypes on longevity with high probability would require a ten-fold increase in the number of families used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435994
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  • 5
    Electronic Resource
    Electronic Resource
    Two-dimensional protein electrophoretic analysis of postponed aging inDrosophila (1993)
    Springer
    Genetica 91 (1993), S. 183-198 
    Details
    ISSN: 1573-6857
    Keywords: aging ; Drosophila ; electrophoresis ; evolution ; longevity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Five populations ofDrosophila melanogaster that had been selected for postponed aging were compared with five control populations using two-dimensional protein gel electrophoresis. The goals of the study were to identify specific proteins associated with postponed aging and to survey the population genetics of the response to selection. A total of 321 proteins were resolvable per population; these proteins were scored according to their intensity. The resulting data were analyzed using resampling, combinatoric, and maximum parsimony methods. The analysis indicated that the populations with postponed aging were different from their controls with respect to specific proteins and with respect to the variation between populations. The populations selected for postponed aging were more heterogeneous between populations than were the control populations. Maximum parsimony trees separate the selected populations, as a group, from their controls, thereby exhibiting a homoplastic pattern.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435997
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  • 6
    Electronic Resource
    Electronic Resource
    Preface (1993)
    Springer
    Genetica 91 (1993), S. 1-1 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435982
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  • 7
    Electronic Resource
    Electronic Resource
    The janiform genetics of aging (1993)
    Springer
    Genetica 91 (1993), S. 3-10 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435983
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  • 8
    Electronic Resource
    Electronic Resource
    The mental arms race amplifier (1980)
    Springer
    Human ecology 8 (1980), S. 285-293 
    Details
    ISSN: 1572-9915
    Keywords: hominid evolution ; tool use ; evolutionary game theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: Abstract The use of tools to obtain food is probably a long-standing hominid adaptation. Therefore, the rapid increase in hominid brain size over the last million years cannot be explained by selection for basic tool use alone. Two alternative theories, here termed the ecological adaptation hypothesis and the intraspecific competition hypothesis, are reviewed and rejected. Instead, a combination of these two theories is offered: the mental arms race amplifier hypothesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01561028
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  • 9
    Electronic Resource
    Electronic Resource
    Genetics of increased lifespan in drosophila (1989)
    New York, NY : Wiley-Blackwell
    BioEssays 11 (1989), S. 132-135 
    Details
    ISSN: 0265-9247
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Natural selection in the laboratory has been used to produce populations of Drosophila with genetically increased lifespan. These populations have been used to determine the physiological basis of postponed ageing and its pleiotropic concomitants. It appears that many loci and a number of physiological alterations are involved in increased lifespan.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bies.950110505
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  • 10
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    Can Human Aging be Postponed? (1999)
    Springer Nature
    Details
    Publication Date: 1999-12-01
    Print ISSN: 0036-8733
    Electronic ISSN: 1946-7087
    Topics: Biology , Natural Sciences in General , Physics
    Published by Springer Nature
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