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Identifier |
000434071 |
Title |
Μελέτη της ακραιόφιλης συμπεριφοράς του λειχήνα Pleurosticta acetabulum σε ακραία UVB-ακτινοβολία σε σχέση με την μεταβολική του δυνατότητα να παράγει υδρογόνο |
Alternative Title |
Study of the extremophilic behavior of the lichen Pleurosticta acetabulum at extreme UVB-radiation in relation to its metabolic capacity to produce hydrogen |
Author
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Κυριατζή, Αναστασία Ν.
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Thesis advisor
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Κοτζαμπάσης, Κυριάκος
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Reviewer
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Πυρίντσος, Στέργιος
Σαρρής, Παναγιώτης
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Abstract |
The purpose of this work is to demonstrate the extremophilic behavior of the lichen
Pleurosticta acetabulum at extreme UVB radiation (1.7 mW/cm2= 1000 J/m2
.min) for
various time periods (4, 20 & 70h) maintaining its metabolic capacity to produce
hydrogen (H2). Lichen is a special micro-ecosystem, which consisted of a fungus and a
green alga or cyanobacterium. The fungus offers water to photosynthetic organism,
which in exchange provides chemical energy through photosynthesis. The particularity
of this symbiotic system is its ability to remove (all) moisture and to remain in an
inactive state in order to be protected from extreme conditions. The results of this
project prove the ability of lichen to survive under extreme UVB radiation for long
time, both in dehydrated and in regenerated form. The lichen viability was tested using
fluorescence induction techniques (OJIP-test), which records changes in molecular
structure and function of the photosynthetic mechanism. Based on the results of gas
chromatography, using thermal conductivity detector (GC-TCT), it is demonstrated that
the lichen can retain its ability to produce large amount of molecular hydrogen when it
exposed in high intensities of UVB radiation. Furthermore, combined expose of lichen
to high intensity of UVB radiation, vacuum conditions (10 mbar for 24 hours) and
extreme temperatures (-196oC and +70oC) highlighted its poly-extremophilic behavior.
The lichen remain substantially unaffected and recovered completely when condition
changed (regeneration in water) maintaining its ability to produce large amount of
hydrogen only by adding water in a close system. Hydrogen is a promising fuel for the
future and this ability of the lichen micro-ecosystem to withstand extreme conditions
and to produce large amount of hydrogen, without the need of additional energy, allows
the use of lichens for future biotechnological applications even in extreme
environments of other planets, such as Mars, paving the way for astrobiological and
astrobiotechnological applications.
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Language |
Greek |
Subject |
Astrobiology |
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Extremophiles |
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Hydrogen production |
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Lichens |
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Symbiosis |
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Ακραιοφιλή |
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Αστροβιολογία |
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Λειχήνες |
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Παραγωγή υδρογόνου |
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Συμβίωση |
Issue date |
2020-11-27 |
Collection
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School/Department--School of Sciences and Engineering--Department of Biology--Post-graduate theses
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Type of Work--Post-graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/d/6/f/metadata-dlib-1605779178-409906-7970.tkl
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Views |
351 |