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Title Βιοενεργητική στρατηγική βιοαποικοδόμησης χλωριωμένων φαινολικών ενώσεων από το μονοκύτταρο χλωροφύκος Scenedesmus obliquus
Alternative Title Bioenergetic strategy of biodegradation of chlorinated phenolic compounds by the single celled green alga Scenedesmus obliquus
Author Καραμανλή, Μαρία
Thesis advisor Κοτζαμπάσης, Κυριάκος
Abstract In the present work, the ability of the microalga Scenedesmus obliquus to biodegrade chlorinated phenolic compounds was studied. All the chlorinated phenolic compounds were studied (2-mCP, 3-mCP, 4-mCP, 2,3-dCP, 2,4-dCP, 5-trCP, 2,3,6-trCP, 2,4,5-trCP, 2,4,6-trCP, 3,4,5-trCP, 2,3,4,5- 5,6-teCP, 2,3,4,6-teCP, pCP) and the biodegradation of chlorophenols proved to be a bioenergetic process. The microalga manages its energy reserves by investing them, depending on the toxicity of the environment, either on the growth (biomass increase) or the biodegradation of the toxic compound. In all treatments the toxicity of all chlorophenols was expressed (i) with fluorescence induction measurements indicating the molecular structure and function of the photosynthetic apparatus which express the level of stress, (ii) with the differentiation of O2 level (as they are treatments in closed systems) indicating the relationship of the photosynthetic process and the respiratory process and (iii) the biomass increase of the culture as an expression of growth. Finally, the microalga seems to follow two different detoxification strategies. In relatively low toxicity conditions (mCPs, 2,6-dCP, 2,4-dCP), microalga use all or at least more of its energy reserves to increase its biomass production. Thus, the increased number of cells has to face lower number of phenolic compounds. With this strategy, detoxification occurs without investment of additional energy (indirect detoxification). In higher toxicity conditions (2,3-dCP, 2,5-dCP, 3,4-dCP, 3,5-dCP, trCPs, teCPs, pCP) the microalga invest more or all of its energy reserves in the biodegradation of phenolic compounds, while less or no energy invests for biomass increase (direct detoxification). Considering that we can interfere in microalga's energy reserves which define its endurance frames in the toxic environment and knowing the bioenergetic strategy of microalgae for biodegradation we can easily and purposefully use microalgae to biodegrade toxic waste in the frame of a smart biotechnology in the near future.
Language Greek
Subject Chlorophenols
Issue date 2017-07-21
Collection   School/Department--School of Sciences and Engineering--Department of Biology--Graduate theses
  Type of Work--Graduate theses
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