Sökning: "nisch"

Visar resultat 6 - 10 av 14 avhandlingar innehållade ordet nisch.

1. 6. Extratumoral effects of highly aggressive prostate cancer

   Författare :Kerstin Strömvall; Anders Bergh; Sofia Halin Bergström; Göran Landberg; Umeå universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Prostate cancer; tumor instructed normal tissue; TINT; non-malignant prostate tissue; lymph nodes; lymph node metastasis; pre-metastatic niche; tumor microenvironment; tumor macroenvironment; tumor immunoediting; Dunning rat model of prostate cancer;

   Sammanfattning : Prostate cancer (PC) is the most common cancer in Sweden. Most patients have slow growing tumors that will not cause them any harm within their lifetime, but some have aggressive tumors and will die from their disease. LÄS MER

3. 7. Roles of secreted bacterial factors in modulation of host cell signalling

   Författare :Eric Toh; Sun Nyunt Wai; Teresa Frisan; Staffan Bohm; Ann-Beth Jonsson; Umeå universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; bacteria-host interaction; motility-associated killing factor A; outer membrane vesicles; cytolysin A; phosphatidylinositol 4-phosphate 5-kinase alpha; enhancer of zeste homologue 2; epigenetic modulation; Medical Cell Biology; medicinsk cellbiologi; mikrobiologi; Microbiology;

   Sammanfattning : Pathogenic bacteria employ several secretion systems to release or inject virulence factors that may alter host cell processes, generate a replicative niche, and aid bacterial survival in adverse environments. This thesis presents my investigations on how bacterial factors can modulate host cell signalling mechanisms. LÄS MER

4. 8. Inom transnationella och lokala sociala världar - Om sociala stödutbyten och försörjningsstrategier bland svensksomalier

   Författare :Charlotte Melander; Göteborgs universitet; []
   Nyckelord :Social worlds; social support; social network; reciprocity; intensity; durability; welfare regime; transnationalism; diaspora; strategy;

   Sammanfattning : The aim of this study was to describe and analyse the exchange of social support within the social network of Swedish-Somalis within and outside of Sweden. The aim was also to describe and analyse their strategies to earn a living within and outside of Sweden. The study consists of 23 qualitative interviews with 12 people. LÄS MER

5. 9. Dynamics of omnivorous crayfish in freshwater ecosystems

   Författare :Karin Olsson; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; crayfish; freshwater ecosystems; niche width; growth rate; stable isotope analysis; recruitment; RNA:DNA analysis; Ecology; food availability and quality; trophic position; population dynamics;

   Sammanfattning : In this thesis I examine the dynamics of crayfish in streams and lakes. I have studied the influence of abiotic and biotic factors on abundance, growth, trophic position, niche breadth, and recruitment of crayfish, by conducting field studies, an outdoor channel experiment and timeseries analysis. LÄS MER

7. 10. Soil phosphorus – a multidimensional resource that plays an important role for grassland plant species richness

   Författare :Jakob Sandberg; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; niche dimension; nutrient limitation; niche differentiation; competition; soil nitrogen; soil phosphorus; plant diversity; species richness; Grassland; land use; landscape scale;

   Sammanfattning : The semi-natural grassland habitats contain an important part of the plant diversity in Europe. Changes in farming practices have lead to drastic decreases in plant species richness. The aim of the present thesis is to contribute to the knowledge about mechanisms governing the plant species richness in grasslands with emphasis on soil nutrients. LÄS MER