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Title |
Μελέτη της ακραιόφιλης συμπεριφοράς του λειχήνα Pleurosticta acetabulum σε διαφορετικές ακραίες θερμοκρασίες διατηρώντας τη μεταβολική του δυνατότητα να παράγει υδρογόνο |
Author
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Τζιβράς, Γεράσιμος
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Thesis advisor
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Κοτζαμπάσης, Κυριάκος
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Abstract |
Lichens are micro-ecosystems created by the symbiosis of a fungus and an alga or
cyanobacterium. These micro-ecosystems have the ability to expel their moisture, transitioning into an inactive state in order to protect themselves from adverse
environmental conditions. Previous studies have shown the ability of lichens to
survive in a plethora of extreme conditions. The current work focuses on studying the
tolerance of the dehydrated lichen Pleurosticta acetabulum to different extreme
temperatures (-196°C, -86°C, -20°C, +5.7°C, +25°C, +60°C, and +70°C). Furthermore, the combined exposure to extreme temperatures with the extreme UVB
radiation (1,7mW/cm2 = 1000 J/m2*min for 70 hours) was also studied. In all cases, we examined the lichen’s ability to survive, while fully maintaining its functionality, and production of molecular hydrogen in closed systems after the establishment of
anoxic/anaerobic conditions (due to the lichens’ intense respiratory activity). The
viability of the lichen was evaluated based on the molecular structure and function of
the photosynthetic apparatus via fluorescence induction measurements (OJIP-test), while the hydrogen production was measured using thermal conductivity gas
chromatography (GC-TCD). Our results showed that the lichen was regenerated
successfully, while simultaneously maintaining its functionality and its capacity for
molecular hydrogen production in all of the aforementioned treatments. We, therefore, conclude that lichens can survive in a temperature range from -196°C to +70°C as
well as in a combination of these extreme temperatures and exposure to vacuum and
extreme UVB radiation. Their survivability and the complete preservation of their
functionality combined with their capacity for molecular hydrogen production allow
the use of lichens in future biotechnological applications, even in the extreme
environments of other planets, paving the way for astrobiological and
astrobiotechnological applications.
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Language |
Greek |
Issue date |
2022-03-28 |
Collection
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School/Department--School of Sciences and Engineering--Department of Biology--Graduate theses
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Type of Work--Graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/2/b/b/metadata-dlib-1637763924-837825-8617.tkl
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Views |
330 |
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