Search for dissertations about: "heterotrophic microorganisms"

Showing result 1 - 5 of 17 swedish dissertations containing the words heterotrophic microorganisms.

  2. 1. Pelagic microorganisms in the northern Baltic Sea : Ecology, diversity and food web dynamics

    Author : Johnny Berglund; Agneta Andersson; Ramon Massana; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; resource limitation; predation limitation; microbial food web; heterotrophic microorganisms; nanoflagellates; ciliates; protists; resource heterogeneity; chrysomonads; chrysophytes; group-specific PCR-DGGE primers; Baltic Sea; Marine ecology; Marin ekologi;

    Abstract : Heterotrophic microorganisms are important for the flow of carbon and nutrients in the sea. Bacteria, nanoflagellates and ciliates are relevant components of the pelagic food web. In order to be able to predict the outcome of e.g. READ MORE

  4. 2. Functional Profiling Of Metabolic Regulation In Marine Bacteria

    Author : Saraladevi Muthusamy; Jarone Pinhassi; Torsten Thomas; Sarala Devi Muthusamy; Institutionen för biologi och miljö (BOM) Linnéuniversitetet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; marine microbiology; physiology; heterotrophic bacteria; adaptive strategies; survival; proteomics; growth phase; proteorhodopsin; inorganic sulphur oxidation; anaplerotic CO2 fixation; Miljövetenskap; Environmental Science;

    Abstract : Oceans are powered by active, metabolically diverse microorganisms, which are important in regulating biogeochemical cycles on Earth. Most of the ocean surface is often limited by nutrients, influencing bacterial growth and activities. READ MORE

  5. 3. Mechanisms structuring the pelagic microbial food web : Importance of resource and predation

    Author : Kristina Samuelsson; Agneta Andersson; Christiane Lancelot; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ecology; pelagic microbial food web; bacteria; flagellates; ciliates; phytoplankton; mixotrophy; nutrient status; predation limitation; resource limitation; Baltic Sea; Ekologi; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi;

    Abstract : Temporal and spatial variations of pelagic microorganisms in the northern Baltic Sea were studied, as well as factors influencing their abundance and growth rates. Three main questions were asked 1) How does increased productivity influence the structure of the microbial food web? 2) Does predation limitation vary between trophic levels? 3) What is the relative importance of resource and predation limitation at different trophic levels?A field study in the northern Baltic Sea showed that dominating protozoa, flagellates and ciliates, increased with increasing primary productivity from north to south. READ MORE

  6. 4. The role of allelopathy in microbial food webs

    Author : Astrid Weissbach; Catherine Legrand; Ellen Van Donk; Linnéuniversitetet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Microbial food web; Allelopathy; Alexandrium tamarense; Prymnesium parvum; Infochemicals; marine plankton community; Freshwater ecology; Limnisk ekologi; Akvatisk ekologi; Aquatic Ecology;

    Abstract : Phytoplankton produce allelochemicals; excreted chemical substances that are affecting other microorganisms in their direct environment.In my thesis, I investigated strain specific variability in the expression of allelochemicals of the harmful flagellate Prymnesium parvum, that is euryhaline but mainly bloom forming in brackish water. READ MORE

  7. 5. On thermodynamic and kinetic constraints in autotrophic metabolism

    Author : Markus Janasch; Elton P. Hudson; Bas Teusink; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; autotrophic metabolism; cyanobacteria; microbial metabolic engineering; computational systems biology; biochemical thermodynamics; kinetic modelling; Bioteknologi; Biotechnology;

    Abstract : Earth has entered a new geological epoch, the Anthropocene, defined by humanity’s impact on the environment with increased emissions of CO2 due to burning of fossil resource as a major contributor. To ensure a sustainable future, humanity has to move towards a circular economy, where released CO2 is re-captured and turned into resources. READ MORE