Search for dissertations about: "heterotrophic"

Showing result 1 - 5 of 71 swedish dissertations containing the word heterotrophic.

  1. 1. Links Between Structure and Function of Heterotrophic Aquatic Bacterial Communities

    University dissertation from Uppsala : Institutionen för ekologi och evolution

    Author : Silke Langenheder; Uppsala universitet.; [2005]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ecology; heterotrophic bacteria; dissolved organic matter; diversity; community composition; ecosystem functioning; salinity; Ekologi; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology; NATURVETENSKAP Biologi Terrestisk; limnisk och marin ekologi;

    Abstract : Heterotrophic bacteria utilize dissolved organic matter, and the carbon flow through an ecosystem depends on the fractions of the utilized carbon that is either respired or transferred to higher trophic levels. The major aim this thesis is to investigate 1) the relationship between composition and functioning in heterotrophic bacterioplankton communities and 2) the influence of environmental conditions on both parameters. READ MORE

  2. 2. Cyanobacteria in symbiosis with plants : Protein patterns and regulatory mechanisms

    University dissertation from Stockholm : Botaniska institutionen

    Author : Martin Ekman; Stockholms universitet.; [2005]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Cyanobacteria; symbiosis; Nostoc; Gunnera; Azolla; nitrogenase; modification; heterotrophic; proteomics; unsequenced; NATURAL SCIENCES Biology Organism biology Plant physiology; NATURVETENSKAP Biologi Organismbiologi Växtfysiologi;

    Abstract : Cyanobacteria belonging to the heterocystous genus Nostoc, capable of oxygenic photosynthesis and nitrogen fixation via the enzyme nitrogenase, may form symbiotic associations with plants. In these associations most of the N2 fixed by the symbiotic cyanobacteria (cyanobiont) is transferred to the host, which in turn supplies the cyanobiont with fixed carbon. READ MORE

  3. 3. Photochemical alterations of dissolved organic matter : Impact on heterotrophic bacteria and carbon cycling in lakes

    University dissertation from Linköping : Tema, Linköpings universitet

    Author : Stefan Bertilsson; Linköpings universitet.; Linköpings universitet.; [1999]

    Abstract : Globally, the amount of carbon in dissolved organic matter (DOM) is similar to the total amount in the atmosphere. DOM also plays a key role in structuring natural surface waters and affects the physical, chemical, and biological character of these systems. READ MORE

  4. 4. Distribution and activity of nitrogen-fixing bacteria in marine and estuarine waters

    University dissertation from Växjö, Kalmar : Linnaeus University Press

    Author : Hanna Farnelid; Linnéuniversitetet.; [2013]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Mikrobiologi; Microbiology; 454-pyrosequencing; diazotrophs; heterotrophic bacteria; marine bacteria; marine microbial ecology; microbiology; nifH; nitrogenase; nitrogen fixation; PCR; qPCR;

    Abstract : In aquatic environments the availability of nitrogen (N) generally limits primary production. N2-fixing prokaryotes (diazotrophs) can convert N2 gas into ammonium and provide significant input of N into the oceans. Cyanobacteria are thought to be the main N2-fixers but diazotrophs also include a wide range of heterotrophic bacteria. READ MORE

  5. 5. The Role of Picophytoplankton in Lake Food Webs

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Stina Drakare; Uppsala universitet.; [2002]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biology; picophytoplankton; competition; heterotrophic bacteria; nutrients; humic DOC; Biologi; NATURAL SCIENCES Biology; NATURVETENSKAP Biologi; limnologi; Limnology;

    Abstract : Picophytoplankton were inferior competitors for inorganic phosphorus compared to heterotrophic bacteria. This may be due to the source of energy available for the heterotrophs, while cell-size was of minor importance. However, picophytoplankton were superior to large phytoplankton in the competition for nutrients at low concentrations. READ MORE