Sökning: "defense mechanisms"

Visar resultat 11 - 15 av 397 avhandlingar innehållade orden defense mechanisms.

  1. 11. Cyanobacteria in symbiosis with plants : Protein patterns and regulatory mechanisms

    Författare :Martin Ekman; Birgitta Bergman; Dave G. Adams; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Cyanobacteria; symbiosis; Nostoc; Gunnera; Azolla; nitrogenase; modification; heterotrophic; proteomics; unsequenced; Plant physiology; Växtfysiologi;

    Sammanfattning : Cyanobacteria belonging to the heterocystous genus Nostoc, capable of oxygenic photosynthesis and nitrogen fixation via the enzyme nitrogenase, may form symbiotic associations with plants. In these associations most of the N2 fixed by the symbiotic cyanobacteria (cyanobiont) is transferred to the host, which in turn supplies the cyanobiont with fixed carbon. LÄS MER

  3. 12. Resistance and recolonization of bryophyte assemblages following disturbances : - detecting patterns and exploring mechanisms

    Författare :Martin Schmalholz; Kristoffer Hylander; Jari Kouki; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Bryophytes; boreal forest; boulders; clear-cutting; disturbance; establishment; insect outbreaks; microtopography; recolonization; resistance; spatial heterogeneity; succession; wildfires; Biology; Biologi; Plant Ecology; växtekologi;

    Sammanfattning : Disturbances are ubiquitous features of most northern forest ecosystems. The subsequent response of plant assemblages on both short (resistance or not) and long term (recolonization or not) will depend on a number of factors operating at several spatial scales. LÄS MER

  4. 13. Modeling Organizational Dynamics : Distributions, Networks, Sequences and Mechanisms

    Författare :Hernan Mondani; Fredrik Liljeros; Rickard Sandell; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; organizational dynamics; social organizing; organizational change; modeling; organizational growth; process stability; labor flow network; employment trajectories; heavy-tailed distributions; complex network analysis; sequence analysis; agent-based modeling; sociophysics; Sociology; sociologi;

    Sammanfattning : The study of how social organizations work, change and develop is central to sociology and to our understanding of the social world and its transformations. At the same time, the underlying principles of organizational dynamics are extremely difficult to investigate. LÄS MER

  5. 14. Molecular mechanisms in actinorhizal symbioses

    Författare :Tomas Persson; Katharina Pawlowski; Helge Küster; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Plant Physiology; växtfysiologi;

    Sammanfattning : The symbiosis between the nitrogen fixing acinobacterium Frankia and its actinorhizal host plant is very old and their co-evolution has shaped their niche in the environment. Nitrogen is most often the limiting element in soil, and symbiotic plants can, with the help of their micrsymbionts, compete in an efficient way. LÄS MER

  7. 15. Molecular population genetics of inducible defense genes in Populus tremula

    Författare :Carolina Bernhardsson; Stefan Jansson; Santiago González-Martinez; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Populus; herbivore defense; adaptation; population genetics; population structure; association mapping; complex traits; evolutionär genetik; evolutionary genetics;

    Sammanfattning : Plant-herbivore interactions are among the most common of ecological interactions. It is therefore not surprising that plants have evolved multiple mechanisms to defend themselves, using both constitutive chemical and physical barriers and by induced responses which are only expressed after herbivory has occurred. LÄS MER