Search for dissertations about: "marginal populations"
Showing result 16 - 20 of 37 swedish dissertations containing the words marginal populations.
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16. Between open systems and closed doors : the needs and perceptions of parents of children with cognitive disabilities in educational settings
Abstract : This thesis consists of three papers on multivariate frailty models and one paper on the use of latent class models in genetic association studies. The common theme through the four papers is the use of latent variables to capture complex dependence structures in the data. READ MORE
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17. Mating behaviour in Drosophila melanogaster and its implication to genetic variation
Abstract : Not much is known about the mechanisms affecting the genetic composition of populations of different species. To investigate one of these potential mechanisms, mating behaviour, the fruit fly Drosophila melanogaster, was chosen as an experimental animal. READ MORE
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18. Periodontitis in adolescents : presence of Aggregatibacter species and interactions with the host
Abstract : Aggregatibacter actinomycetemcomitans and Aggregatibacter aphrophilus are closely related gram-negative bacteria mainly found in the oral cavity. Periodontitis in adolescents is associated with the presence of A. actinomycetemcomitans, but not with the presence of A. aphrophilus. READ MORE
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19. Systematics, phylogeography and multiple origins of morphs in two species complexes belonging to Cistaceae, Helianthemum oelandicum and H. nummularium
Abstract : The Helianthemum oelandicum complex shows considerable morphological variation across its geographic distribution in Europe and western Asia. By combining four primer pairs and four restriction enzymes I identified nine cpDNA haplotypes with distinct geographical distributions. READ MORE
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20. Geographic Distribution of Intra-specific Variation in Widespread Eurasian boreo-nemoral Woodland Herbs
Abstract : Many woodland plant species have huge distribution areas covering large parts of the Eurasian continent including areas that were glaciated during the last glacial period. In the present thesis, the geographic distribution of variation within such species is investigated and discussed in relation to glacial survival and post-glacial migration, dispersal ability, breeding system and levels of gene-flow between populations and related species, and various methods to measure and analyse genetic variation. READ MORE