Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Interplanetary survival probability of Aspergillus terreus spores under simulated solar vacuum ultraviolet irradiation
Δημιουργός/Συγγραφέας:	[EL] Σαραντοπούλου, Ευαγγελία[EN] Sarantopoulou, Evangelia Gomoiu, I. [EL] Κόλλια, Ζωή[EN] Kollia, Zoe [EL] Κεφαλάς, Αλκιβιάδης Κωνσταντίνος[EN] Cefalas, Alciviadis Constantinos
Εκδότης:	Pergamon-elsevier Science Limited
Τόπος έκδοσης:	Oxford
Ημερομηνία:	2011-01
Γλώσσα:	Αγγλικά
ISSN:	0032-0633
DOI:	10.1016/j.pss.2010.11.002
Περίληψη:	This work is a part of ESA/EU SURE project aiming to quantify the survival probability of fungal spores in space under solar irradiation in the vacuum ultraviolet (VUV) (110-180 nm) spectral region. The contribution and impact of VUV photons, vacuum, low temperature and their synergies on the survival probability of Aspergillus terreus spores is measured at simulated space conditions on Earth. To simulate the solar VUV irradiation, the spores are irradiated with a continuous discharge VUV hydrogen photon source and a molecular fluorine laser, at low and high photon intensities at 10(15) photon m(-2) s(-1) and 3.9 x 10(27) photons pulse(-1) m(-2) s(-1), respectively. The survival probability of spores is independent from the intensity and the fluence of photons, within certain limits, in agreement with previous studies. The spores are shielded from a thin carbon layer, which is formed quickly on the external surface of the proteinaceous membrane at higher photon intensities at the start of the VUV irradiation. Extrapolating the results in space conditions, for an interplanetary direct transfer orbit from Mars to Earth, the spores will be irradiated with 3.3 x 10(21) solar VUV photons m(-2). This photon fluence is equivalent to the irradiation of spores on Earth with 54 laser pulses with an experimental similar to 92% survival probability, disregarding the contribution of space vacuum and low temperature, or to continuous solar VUV irradiation for 38 days in space near the Earth with an extrapolated similar to 61% survival probability. The experimental results indicate that the damage of spores is mainly from the dehydration stress in vacuum. The high survival probability after 4 days in vacuum (similar to 34%) is due to the exudation of proteins on the external membrane, thus preventing further dehydration of spores. In addition, the survival probability is increasing to similar to 54% at 10 K with 0.12 K/s cooling and heating rates.
Τίτλος πηγής δημοσίευσης:	Planetary and Space Science
Τόμος/Κεφάλαιο:	59
Τεύχος:	1
Σελίδες:	63-78
Θεματική Κατηγορία:	[EL] Αστρονομία[EN] Astronomy
Λέξεις-Κλειδιά:	Life and interplanetary travel VUV solar irradiation Aspergillus Panspermia
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2010 Elsevier Ltd. All rights reserved.
Ηλεκτρονική διεύθυνση περιοδικού (link) :	http://www.sciencedirect.com/science/journal/00320633
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο