Sökning: "marine bacteria"
Visar resultat 11 - 15 av 92 avhandlingar innehållade orden marine bacteria.
11. Utilization of terrestrially derived dissolved organic nitrogen by aquatic bacteria
Sammanfattning : I investigated the bacterial utilization of terrestrially derived dissolved organic nitrogen (DON) in aquatic ecosystems, and assessed the potential role of river-born DON in marine eutrophication. To determine the bioavailability of DON, I developed a bioassay employing N-limited bacterial regrowth cultures, which were calibrated with additions of inorganic nitrogen. LÄS MER
12. Effects of solar radiation on the abiotic and bacterially mediated carbon flux in aquatic ecosystems
Sammanfattning : In this Thesis, I studied some of the current aspects of organic matter photochemistry. I analyzed abiotic phototransformations of several types of dissolved (DOM) and particulate organic matter (POM). I also evaluated the effects of phototransformation of several types of DOM on bacteria. LÄS MER
13. Regulation and role of epiphytic nitrification and denitrification in macrophyte-dominated systems
Sammanfattning : This thesis examines mechanisms regulating bacterial nitrification and denitrification in attached microbial communities on surfaces of aquatic macrophytes. It also evaluates the role of epiphytic nitrification and denitrification for the nitrogen turnover in macrophyte-dominated nutrient-rich freshwaters. LÄS MER
14. From genes to ecological function in marine bacteria
Sammanfattning : Bacteria in the sea are constantly exposed to environmental challenges (e.g. variations in nutrient concentrations, temperature and light conditions), and therefore appropriate gene expression response strategies to cope with them efficiently are evolved. LÄS MER
15. The pelagic microheterotrophic food web in the Baltic Sea : bacteria and their dependence on phytoplankton
Sammanfattning : .... LÄS MER