Sökning: "population cycles"

Visar resultat 11 - 15 av 85 avhandlingar innehållade orden population cycles.

  1. 11. Drivers of Population Dynamics in Bacterioplankton : Spotlight on Alphaproteobacteria and its dominant SAR11 Lineage

    Författare :Friederike Heinrich; Stefan Bertilsson; Alexander Eiler; David Kirchman; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; bacterial community dynamics; Alphaproteobacteria; SAR11; LD12; Southern Ocean; lakes; Biology with specialization in Limnology; Biologi med inriktning mot limnologi;

    Sammanfattning : Bacteria are mediators of biogeochemical cycles and are in this way vital for maintaining life on earth. Their distribution, abundance and functioning are driven by environmental heterogeneity and dynamic change in abiotic and biotic factors. LÄS MER

  3. 12. Studies on the Life Cycles of Akinete Forming Cyanobacteria

    Författare :Irene Karlsson Elfgren; Kurt Pettersson; Peter Blomqvist; Tore Lindholm; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; limnology; akinete; germination; recruitment; Biologi; Biology; Biologi; limnologi; Limnology;

    Sammanfattning : Cyanobacteria which can form resting cells (in this case akinetes) are common in meso-eutrophic lakes in temperate regions, often dominating the phytoplankton communities during summer. The life cycles of akinete-forming cyanobacteria has been studied with Gloeotrichia echinulata as a model organism. LÄS MER

  4. 13. Population fluctuations and life history consequences in the arctic fox

    Författare :Magnus Tannerfeldt; David Macdonald; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; Biologi; zoologisk ekologi; Animal Ecology;

    Sammanfattning : In this thesis, I describe and explain drastic population fluctuations in the arctic fox Alopex lagopus (L.). I proceed to examine evolutionary consequences of unpredictable fluctuations in terms of life history strategies. In fluctuating populations, the risks and benefits of different behaviours vary with changes in population density. LÄS MER

  5. 14. Såld spannmål av kyrkotionden : Priser i Östergötland under Sveriges stormaktstid

    Författare :Göran Hansson; Olle Krantz; Magnus Lindmark; Johan Söderberg; Umeå universitet; []
    Nyckelord :Economic history; price history; relative prices; wages; price cycles; Östergötland; food consumtion; price comparisons; price index; bad harvests; ekonomisk historia; Economic History;

    Sammanfattning : The thesis presents annual price series for rye and barley in Östergötland during the period 1592-1735. Prices of wheat, oats, animal products, building materials, iron, nails, horse shoes and horse shoe nails from about the mid-17th century up to 1735 are also presented and analysed. LÄS MER

  7. 15. Epidemiological and clinical aspects of T-cell lymphoma

    Författare :Henrik Cederleuf; Medicinsk onkologi; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; population-based; peripheral T-cell lymphoma; Anaplastic large cell lymphoma; angioimmunoblastic; elderly; ASCT; comorbidity; prognostic factors; follow-up; limited stage; etoposide; CHOP; overall survival; radiotherapy;

    Sammanfattning : T-cell lymphoma (TCL) is a rare group of malignancies and one of the important aims in this thesis has been to broaden the general knowledge of TCL with descriptive patient data. Main focus has been to examine prognosticfactors for overall survival (OS) and progression-free survival (PFS), and to evaluate different treatment approaches and follow-up (FU) after treatment. LÄS MER