Sökning: "key conditions"

Visar resultat 16 - 20 av 1408 avhandlingar innehållade orden key conditions.

  1. 16. The nitrogen economy of mountain birch : As related to environmental conditions and genotype

    Författare :Martin Weih; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ecology; Betula pubescens ssp. czerepanovii; growth; nitrogen; subarctic; temperature; ultraviolet radiation; Ekologi; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi; ekologisk botanik; Ecological Botany;

    Sammanfattning : Responses of mountain birch growth to changed environmental conditions arestrongly affected by birch genotype, and nitrogen economy is a key factor influencingthe winter survival of first-year seedlings. These are some of the findings of a series ofstudies, in which growth, nitrogen economy and winter survival were analysed usingpot-grown seedlings of mountain birch (Betula pubescens ssp. LÄS MER

  3. 17. Light conditions in seasonally ice-covered waters : within the Baltic Sea region

    Författare :Elina Kari; Susanne Kratzer; Matti Leppäranta; Monika Winder; Tiit Kutser; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Seasonal sea ice; Fast ice; Drift ice; Phytoplankton spring bloom; Under-ice plume; Turbidity; Suspended particulate matter; Chlorophyll; Coloured dissolved organic matter; Baltic Sea; Marine Ecology; marin ekologi;

    Sammanfattning : Seasonal ice cover is a major driver of seasonality in aquatic ecosystems in the Baltic Sea region. Ice cover influences the underwater light conditions directly by limiting the light transfer and indirectly by modifying the mixing and circulation under the ice. LÄS MER

  4. 18. Causes and Consequences of Early-life Conditions : Alcohol, Pollution and Parental Leave Policies

    Författare :Jenny Jans; J. Peter Nilsson; Per Johansson; Arizo Karimi; Matthew Neidell; Uppsala universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Air pollution; alcohol availability; parental leave policies; health; educational attainment; earnings; time investments; child outcomes; Economics; Nationalekonomi;

    Sammanfattning : Essay I: This paper studies the effect of air pollution on infant health in Sweden. Combining register panel data on birth outcomes and family characteristics with pollution data, I estimate the effect of particulate matter (PM10) on several birth outcomes that previously have been shown to be predictive of future outcomes. LÄS MER

  5. 19. Environmental and economic conditions of landfill mining : The development and application of a systems analysis approach

    Författare :Per Frändegård; Joakim Krook; Niclas Svensson; David Laner; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Landfill mining is a relatively unproven, still uncertain concept for extracting resources from landfills. Previous studies in the field have mainly focused on solving local environmental problems related to leaching and other landfill management issues, or characterizing the material composition of various landfills. LÄS MER

  7. 20. Cell renewal : terms and conditions may apply

    Författare :Pedro Réu; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : The longevity and turnover of the different constituent cells of an organism define its development, size, health, and biological age. The present thesis discusses the renewal rates and functions of cells in several organs and tissues: peripheral blood, bone marrow, intestine and central nervous system. LÄS MER