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Showing result 1 - 5 of 58 swedish dissertations matching the above criteria.

2. 1. Ecology and evolution in a host-parasitoid system : Host search, immune responses and parasitoid virulence

   Author : Lisa Fors; Peter Hambäck; Wertheim Bregje; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Host-parasitoid interactions; Plant-herbivore interactions; Host search; Volatiles; Pheromones; Geographic variation; Cellular defence; Melanisation; Encapsulation; Asecodes; Galerucella; Plant Ecology; växtekologi;

   Abstract : In host-parasitoid systems, there is a continuous coevolutionary arms race where each species imposes a strong selection pressure on the other. The host needs to develop defence strategies in order to escape parasitism and the parasitoid must evolve counter-defence strategies in order to overcome the host’s immune defence and successfully reproduce. READ MORE

4. 2. Evolutionary and mechanistic aspects of insect host plant preference

   Author : Alexander Schäpers; Niklas Janz; Steven Heard; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; host plant choice; host range; diet breadth; butterfly; oviposition; specialist; generalist; insect-plant interaction; search behavior; olfaction; decision making; evolution; parasite-host interaction; zoologisk ekologi; Animal Ecology;

   Abstract : Plant feeding insects comprise about 25% of all animal species on earth and play an important role in all ecosystems. Although we understand that their association with plants is a key-factor driving the diversification in this group, we still have large gaps in our knowledge of the underlying processes of this relationship. READ MORE

5. 3. It Takes Two to Tango : Bacterial heterogeneity and host cell features govern Salmonella infection

   Author : Viktor Ek; Mikael E. Sellin; Francisco García del Portillo; Uppsala universitet; []
   Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Salmonella; swimming; swim pattern; targetting; virulence; invasion; host-pathogen interactions; epithelium; epithelial cells; macrophages; monocytes; monolayer; flagella; genome; genetic; barcoding; discreet-invasion; shape; morphology; antibiotics; persistence; Mikrobiologi; Microbiology;

   Abstract : Salmonella enterica serovar Typhimurium (S.Tm) causes enterocolitis with significant worldwide morbidity and mortality. The general aim of this thesis is to investigate variation in host cell invasion mechanisms used by S.Tm across different host cell contexts, as well as the influence of bacterial cell-cell heterogeneity on invasion-relevant S. READ MORE

6. 4. The importance of search behavior and movements for spatial distributions of herbivorous insects

   Author : Petter Andersson; Peter Hambäck; Johan Ehrlén; Tomas Roslin; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Olfactory search; Habitat heterogeneity; Species-traits; Immigration; Scaling relationships; Patch size; Plant-insect interactions; EAG; Odors; Pheromones; Plant Ecology; växtekologi;

   Abstract : Insect populations commonly show large spatial variation in density, and much variation have been shown to be explained by the search behavior applied by the insect when locating habitat patches. This thesis explores the importance of odor-mediated attraction for immigration rates of herbivorous insects in relation to the size of the patches and the density of host plants within the patches. READ MORE

7. 5. Novel host defence mechanisms during bacterial infections

   Author : Malin Elvén; Lund Dermatologi och venereologi; []
   Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; ApoE; Complement System; TFPI-2; Antimicrobial peptides; AMP; Immunolgobulins; endotoxins; Staphylococcus aureus; Pseudomonas aeruginosa; Escheria coli;

   Abstract : The immune system has evolved through thousands of years and its architecture has challenged the medical field since the first hieroglyphs and will likely continue do so. With our co-evolution with millions of other species, the complexity to treat infectious diseases has been a race in increasing speed ever since. READ MORE