Search for dissertations about: "Fitness effects"

Showing result 21 - 25 of 238 swedish dissertations containing the words Fitness effects.

  2. 21. Dynamics of inbreeding and genetic rescue in a small population

    Author : Malin Hasselgren; Karin Norén; Carles Vilà; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; inbreeding; inbreeding depression; genetic rescue; fitness; genomics; conservation genetics; mutational load; arctic fox; pedigree; gene flow; zoologisk ekologi; Animal Ecology;

    Abstract : Isolation at small population size can reduce individual fitness and impede population growth caused by inbreeding and genetic drift (i.e. inbreeding depression). Inbreeding depression can however be circumvented by gene flow from unrelated individuals through masking of recessive deleterious alleles and contribute to population persistence (i. READ MORE

  4. 22. Light, stress and herbivory : from photoprotection to trophic interactions using Arabidopsis thaliana as a model organism

    Author : Martin Frenkel; Jon Moen; Stefan Jansson; Don Cipollini; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Arabidopsis thaliana; photoprotection; herbivory; light-stress; jasmonate; fitness; FDE; dual-choice; Biology; Biologi;

    Abstract : Photosynthesis is the most important process for nearly all life on earth. Photosynthetic organisms capture and transfer light energy from the sun into chemical energy which in turn provides a resource base for heterotrophic organisms. Natural light regimes are irregular and vary over magnitudes. READ MORE

  5. 23. Mechanisms of Antibiotic Resistance Evolution

    Author : Michael Knopp; Dan Andersson; Anca Segall; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Antibiotic resistance evolution; Escherichia coli; Salmonella; porins; fitness; epistasis; strain-specificity; sub-MIC; de novo gene evolution;

    Abstract : The continuing emergence and spread of antibiotic resistant bacteria are a threat to various applications in modern medicine and impose a strong economic burden on health systems. The development of new antibiotics is slow and cannot counterbalance the dissemination of resistant bacteria. READ MORE

  6. 24. Evolution and Mechanisms of Tigecycline Resistance in Escherichia coli

    Author : Marius Linkevičius; Dan I. Andersson; Linus Sandegren; Patrice Courvalin; Uppsala universitet; []
    Keywords : Tigecycline; Bacterial resistance; Fitness; Escherichia coli; AcrAB; LPS; Tet proteins; Tet A ; Tet K ; Tet M ; Tet X ; tet genes; pUUH239.2; Mikrobiologi; Microbiology;

    Abstract : Antibiotic resistance is an ongoing global medical crisis and we are in great need of new antibacterial agents to combat rapidly emerging resistant pathogens. Tigecycline is one of few drugs that have been introduced into medicine during the last two decades. READ MORE

  7. 25. The light-harvesting antenna of higher plant photosystem I

    Author : Ulrika Ganeteg; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Plant physiology; antisense; Arabidopsis thaliana; chlorophyll; fitness; LHC; photosynthesis; Växtfysiologi; Plant physiology; Växtfysiologi;

    Abstract : During photosynthesis, two multi-protein complexes, photosystems (PS) I and II work in tandem to convert the light-energy absorbed by the light-harvesting antennae into chemical energy, which is subsequently used to assimilate atmospheric carbon dioxide into organic carbon compounds. This is the main nutritional basis for life on Earth. READ MORE