Sökning: "Leif Tibell"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden Leif Tibell.

  1. 1. Lichens in Mountain Rainforests of Tanzania : Studies of Usnea and Calicioids

    Författare :Stella Gilbert Temu; Sanja Tibell Savić; Leif Tibell; Philippe Clerc; Göran Thor; Donatha Tibuhwa; Einar Timdal; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Lichens; Usnea; calicioids; molecular phylogeny; secondary chemistry; morphotypes; Biology with specialization in Systematics; Biologi med inriktning mot systematik;

    Sammanfattning : 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. LÄS MER

  3. 2. The caliciales of boreal North America : taxonomy, ecological and distributional comparisons with Europe, and ultrastructural investigations in some species

    Författare :Leif Tibell; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; Biologi;

    Sammanfattning : .... LÄS MER

  4. 3. Phylogenetic Studies in Usnea (Parmeliaceae) and Allied Genera

    Författare :Kristina Articus; Leif Tibell; Mats Wedin; Jan-Eric Mattsson; Philippe Clerc; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; Usnea; Neuropogon; Dolichousnea; Eumitria; Protousnea; Parmeliaceae; phylogeny; taxonomy; species pairs; morphology; ITS-LSU; β-tubulin; mtSSU; Biologi; Biology; Biologi;

    Sammanfattning : 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. LÄS MER

  5. 4. Implantation-Site Dependent Differences in Engraftment and Function of Transplanted Pancreatic Islets

    Författare :Joey Lau; Per-Ola Carlsson; Leif Jansson; Carina Carlsson; Caroline Kampf; Annika Tibell; Uppsala universitet; []
    Nyckelord :Cell biology; Type 1 diabetes; pancreatic islets; human islets; islet transplantation; vascular engraftment; revascularization; implantation-site; microenvironment; vascular density; insulin release; pro insulin biosynthesis; glucose oxidation; Cellbiologi;

    Sammanfattning : 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. LÄS MER

  7. 5. The puzzle of lichen symbiosis : Pieces from Thamnolia

    Författare :Ioana Onuț-Brännström; Hanna Johannesson; Leif Tibell; Anne Pringle; Uppsala universitet; []
    Nyckelord :Thamnolia; lichen; symbiosis; photobiont; mycobiont; phylogeography; MAT-loci; barcoding; NGS; genome; transcriptome; Ice Age; Biology with specialization in Systematics; Biologi med inriktning mot systematik;

    Sammanfattning : 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. LÄS MER