Sökning: "tropical and temperate regions"

Visar resultat 1 - 5 av 12 avhandlingar innehållade orden tropical and temperate regions.

  1. 1. Forests and Water - Friends or Foes? : Hydrological implications of deforestation and land degradation in semi-arid Tanzania

    Författare :Klas Sandström; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Water in nature and society; Vatten i natur och samhälle;

    Sammanfattning : This is a study of landscape hydrology; a type of hydrology which focuses on large sca1e implications of hydrologica1 processes as a function of hydroclimate, surface and sub-surface land properties, and the effect of human activities. The focus of the thesis is groundwater recharge and dry season flow following deforestation and land degradation. LÄS MER

  3. 2. Modulators of Vibrio cholerae predator interaction and virulence

    Författare :Barbro Lindmark; Sun Nyunt Wai; Kristian Riesbeck; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Vibrio cholerae; Caenorhabditis elegans; PrtV; outer membrane vesicles; non-O1 non-O139; serum resistance; Molecular biology; Molekylärbiologi; molekylärbiologi; Molecular Biology;

    Sammanfattning : Vibrio cholerae, the causal agent of cholera typically encodes two critical virulence factors: cholera toxin (CT), which is primarily responsible for the diarrhoeal purge, and toxin-co-regulated pilus (TCP), an essential colonisation factor. Nontoxigenic strains expressing TCP can efficiently acquire the CT gene through lysogenic conversion with CTXΦ, a filamentous phage that encodes CT and uses TCP as a receptor. LÄS MER

  4. 3. Persistent organic pollutants in the atmosphere - spatial and temporal variations

    Författare :Cecilia Backe; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; tropical and temperate regions; global transport; temperature; latitudinal fractionation; fugacity; soil organic matter; soil-air exchange; washout ratio; rain; precipitation; atmosphere; spatial and temporal variations; DDT; PCB; persistent organic pollutants; polychlorinated biphenyls; Environmental chemistry; Miljökemi; Ecology; Ekologi; Chemistry; Kemi;

    Sammanfattning : In these thesis I have studied the spatial and temporal variations of PCBs in the atmosphere and in precipitation in southern Sweden. Further, soil-air exchange processes of PCBs were investigated. Finally, the long-range transport of PCBs and DDT was studied in the Baltic Sea region and in a tropical vs. a temporal region. LÄS MER

  5. 4. Combined Electricity Production and Thermally Driven Cooling from Municipal Solid Waste

    Författare :Seksan Udomsri; Andrew R. Martin; Torsten Fransson; Erik Dahlquist; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; municipal solid waste; incineration; hybrid cycle; power production; thermally driven cooling; absorption chillers; decentralized thermally driven cooling; district heating; Mechanical and thermal engineering; Mekanisk och termisk energiteknik; SRA - Energy; SRA - Energi;

    Sammanfattning : Increasingly intensive efforts are being made to enhance energy systems via augmented introduction of renewable energy along with improved energy efficiency. Resource constraints and sustained high fossil fuel prices have created a new phenomenon in the world market. LÄS MER

  7. 5. Treatment wetlands in a tropical climate

    Författare :Hristina Bojcevska; Linköpings universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : The decrease of water resources values as a result of eutrophication is a major problem in numerous lakes around the world, including the Great African Lakes. One of the most important tasks to limit this eutrophication, is to decrease the nutrient input from land-based activities. LÄS MER