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  • 2000-2004  (2)
  • 1975-1979  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Production of an interspecific hybrid between Brassica fruticulosa and B. rapa (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 123 (2004), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: An interspecific hybrid between a wild species, Brassica fruticulosa (2n = 16, FF) and a crop Brassica species, B. rapa (2n = 20, AA) was synthesized using sequential ovary-ovule culture on MS medium supplemented with casein hydrolysate. Morphological, molecular and cytogenetic analysis confirmed the true hybrid nature of the offspring. The F1 plants (2n = 18) were intermediate in morphology, highly pollen-sterile as well as self-sterile. A maximum of three bivalents per PMC was recorded, but 14 I + 2 II was the most common meiotic configuration. Normal pollen fertility and regular bivalent (18 II) formation was observed in the amphiploid sectors of the hybrid plants. The F1 hybrid harboured significantly lower aphid populations than the crop Brassica parent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.2004.01007.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The intramolecular external heavy atom effect in bromo-, benzo-, and naphthonorbornenes (1978)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 100 (1978), S. 4964-4968 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00484a007
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Multivariate Models of Mixed Assortment: Phenotypic Assortment and Social Homogamy for Education and Fluid Ability (2000)
    Springer
    Behavior genetics 30 (2000), S. 455-476 
    Details
    ISSN: 1573-3297
    Keywords: Phenotypic assortment ; social homogamy ; delta paths ; twins ; education ; intelligence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract Phenotypic assortment is assumed to be the principal mechanism of spouse similarity in most biometrical studies. Other assortment mechanisms, such as social homogamy, may be plausible. Two models are presented that consider phenotypic assortment and social homogamy simultaneously (i.e., mixed assortment), where selective associations between social background factors (Model I) versus selective associations between total environments (Model II) distinguish the models. A series of illustrative analyses was undertaken for education and fluid ability available on a sample of 116 Swedish twin pairs and their spouses. On the basis of several fit criteria Model I was preferred over Model II. Both social homogamy and phenotypic assortment may contribute to spouse similarity for educational attainment and fluid ability. Furthermore, spouse similarity for fluid ability may arise indirectly from social homogamy and phenotypic assortment for educational attainment. Power analyses indicated greater observed power for Model I than Model II. Additional power analyses indicated that considerably more twin-spouse sets would be needed for Model II than Model I, to resolve social homogamy and phenotypic assortment. Effects of misspecification of mechanisms of spouse similarity are also briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010250818089
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    Paper (German National Licenses)
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