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Visar resultat 11 - 15 av 31 avhandlingar som matchar ovanstående sökkriterier.
11. Bloom dynamics and population genetics of marine phytoplankton - Community, species and population aspects
Sammanfattning : Phytoplankton are the most important primary producers in the world’s oceans and coastal waters, accounting for nearly half of the global net primary production. Although they are such important organisms, little is known about the ecology and dynamics of phytoplankton. LÄS MER
12. Coastal signals of environmental changes: foraminifera as benthic monitors
Sammanfattning : Climate changes, tightly linked to anthropogenic activities, are significantly altering environments and ecosystems globally, such as by increasing marine and coastal deoxygenation or occurrences of extreme weather events. The significance of paleoenvironmental and -climate reconstructions, as well as monitoring of current conditions, for unravelling baseline natural variation, today’s changes and potential future impacts, has been recognised by the Intergovernmental Panel on Climate Change (IPCC) reports. LÄS MER
13. Air-sea exchange of O2 and CO2 : Processes controlling the transfer efficiency
Sammanfattning : World oceans cover more than 70% of the earth surface and constitutes a major sink of atmospheric CO2. Two of the most important gases in the marine carbon cycling are O2 and CO2 and hence accurate descriptions of the air-sea gas exchange of these gases are crucial. LÄS MER
14. Ecological succession of benthic macrofauna following disturbance : Effects of contaminants and in situ sediment remediation
Sammanfattning : More than 70% of the Earth is covered by water, and most of the sea floor consists of soft sediments, such as mud, clay and sand. Thus, soft sediments form one of the most important habitats on Earth, with a high diversity of organisms. LÄS MER
15. Carcinogenic polycyclic aromatic hydrocarbons : role of human glutathione transferases in conjugate formation and DNA protection
Sammanfattning : Polycyclic aromatic hydrocarbons (PAHs) are widespread mutagenic and carcinogenic environmental pollutants, which requires metabolic activation to electrophilic intermediates and subsequent covalent binding to critical targets in DNA to elicit their biological activity. Bay- and fjord region diol epoxides (DEs) have been identified as the ultimate mutagenic and carcinogenic metabolites of PAHs. LÄS MER