Search for dissertations about: "Leif Tibell"
Showing result 1 - 5 of 8 swedish dissertations containing the words Leif Tibell.
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1. Lichens in Mountain Rainforests of Tanzania : Studies of Usnea and Calicioids
Abstract : Lichens occur in various habitats. They often have narrow niches and are sensitive to environmental changes leading to their use as bioindicators of environmental disturbances and conditions; air and heavy metal pollution, agricultural toxins, assessing forest continuity and drought tolerance. READ MORE
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2. The caliciales of boreal North America : taxonomy, ecological and distributional comparisons with Europe, and ultrastructural investigations in some species
Abstract : .... READ MORE
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3. Phylogenetic Studies in Usnea (Parmeliaceae) and Allied Genera
Abstract : This thesis deals with the phylogeny of the lichen genus Usnea (Parmeliaceae, Ascomycetes). The relationships and the morphological variation among Usnea species has been studied, as well as the relationship of Usnea to allied genera. Two species, U. florida and U. READ MORE
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4. Implantation-Site Dependent Differences in Engraftment and Function of Transplanted Pancreatic Islets
Abstract : Transplanting pancreatic islets into the liver through the portal vein is currently the most common procedure in clinical islet transplantations for treating patients with brittle type 1 diabetes. However, most islet grafts fail within a 5-year period necessitating retransplantation. READ MORE
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5. The puzzle of lichen symbiosis : Pieces from Thamnolia
Abstract : Symbiosis brought important evolutionary novelties to life on Earth. Lichens, the symbiotic entities formed by fungi, photosynthetic organisms and bacteria, represent an example of a successful adaptation in surviving hostile environments. Yet many aspects of the lichen symbiosis remain unexplored. READ MORE