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Identifier 000428753
Title Διαφοροποίηση της μοριακής δομής και λειτουργίας του φωτοσυνθετικού μηχανισμού του χλωροφύκους Scenedesmus obliquus κατά την έκθεση του σε ατμόσφαιρες διαφορετικής σύστασης
Alternative Title Differentiation of the molecular structure and function of the photosynthetic apparatus of the microalga Scenedesmus obliquus in atmospheres of different composition
Author Κυδωνάκης, Ευάγγελος Ε.
Thesis advisor Κοτζαμπάσης, Κυριάκος
Reviewer Πυρίντσος, Στέργιος
Σαρρής, Παναγιώτης
Abstract In the current study we examined the possibility of survival of a green alga (Scenedesmus obliquus) in closed systems with atmospheres of different composition without O2 and CO2 (N2, He, H2+5%He, H2+15%He atmospheres, etc.) and the way to form an atmosphere for the benefit of the algae, through the photosynthetic management of solar radiation. The results showed that the microalgae, which were exposed to anoxic atmospheric conditions (without O2 and CO2) under adequate illumination, could cope with those conditions in a rational way. The complete absence of CO2 seems to be addressed by catabolism of organic matter (from existing cell stocks, e.g., starch) through the respiration process that produce CO2. This CO2 supports the photosynthetic process, which in turn will produce O2, part of which will then be used by the respiration process itself. This respiration-photosynthesis feedback allows the survival, but limits the amount of CO2 that could be invested in the production of organic matter, and therefore biomass, in an autotrophic environment. In case that we enrich the anoxic atmosphere with CO2 (or glucose to be used by the respiration process to produce CO2) [treatments: N2+10%CO2, N2+glc, N2+10%CO2+glc], the microalga appears to overcome this limitation, and a large portion of inorganic carbon (CO2) will be invested in the photosynthetic conversion to organic carbon and biomass. In parallel, the photosynthetic activity and O2 production will be increased. The rate of increase in O2 level, under these conditions, seems to depend simply on the intensity of light and have the tendency to create an atmosphere with a composition approximate to that of the earth's atmosphere, at least as far as O2 level is concerned.
Language Greek
Subject Photosynthesis
Issue date 2020-03-27
Collection   Faculty/Department--Faculty of Sciences and Engineering--Department of Biology--Post-graduate theses
  Type of Work--Post-graduate theses
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