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The SPORES experiment of the EXPOSE-R mission: Bacillus subtilis spores in artificial meteorites

Panitz, Corinna and Horneck, Gerda and Rabbow, Elke and Rettberg, Petra and Moeller, Ralf and Cadet, Jean and Douki, Thierry and Reitz, Guenther (2014) The SPORES experiment of the EXPOSE-R mission: Bacillus subtilis spores in artificial meteorites. International Journal of Astrobiology, pp. 105-114. Cambridge University Press. doi: 10.1017/S1473550414000251. ISSN 1473-5504.

Full text not available from this repository.

Official URL: http://dx.doi.org/10.1017/S1473550414000251

Abstract

The experiment SPORES ‘Spores in artificial meteorites’ was part of European Space Agency's EXPOSE-R mission, which exposed chemical and biological samples for nearly 2 years (March 10, 2009 to February 21, 2011) to outer space, when attached to the outside of the Russian Zvezda module of the International Space Station. The overall objective of the SPORES experiment was to address the question whether the meteorite material offers enough protection against the harsh environment of space for spores to survive a long-term journey in space by experimentally mimicking the hypothetical scenario of Lithopanspermia, which assumes interplanetary transfer of life via impact-ejected rocks. For this purpose, spores of Bacillus subtilis 168 were exposed to selected parameters of outer space (solar ultraviolet (UV) radiation at λ>110 or >200 nm, space vacuum, galactic cosmic radiation and temperature fluctuations) either as a pure spore monolayer or mixed with different concentrations of artificial meteorite powder. Total fluence of solar UV radiation (100–400 nm) during the mission was 859 MJ m⁻². After retrieval the viability of the samples was analysed. A Mission Ground Reference program was performed in parallel to the flight experiment. The results of SPORES demonstrate the high inactivating potential of extraterrestrial UV radiation as one of the most harmful factors of space, especially UV at λ>110 nm. The UV-induced inactivation is mainly caused by photodamaging of the DNA, as documented by the identification of the spore photoproduct 5,6-dihydro-5(α-thyminyl)thymine. The data disclose the limits of Lithopanspermia for spores located in the upper layers of impact-ejected rocks due to access of harmful extraterrestrial solar UV radiation.

Item URL in elib:https://elib.dlr.de/94303/
Document Type:Article
Title:The SPORES experiment of the EXPOSE-R mission: Bacillus subtilis spores in artificial meteorites
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Panitz, CorinnaInstitute of Aerospace Medicine, Radiation Biology, DLR, D-51147 Cologne, Germany and Institute of Pharmacology and Toxicology, RWTH/Klinikum Aachen, D-52074 Aachen, Germany; cpanitz (at) ukaachen.de; corinna.panitz (at) dlr.deUNSPECIFIED
Horneck, GerdaInstitute of Aerospace Medicine, Radiation Biology, DLR, D-51147 Cologne, GermanyUNSPECIFIED
Rabbow, ElkeInstitute of Aerospace Medicine, Radiation Biology, DLR, D-51147 Cologne, GermanyUNSPECIFIED
Rettberg, PetraInstitute of Aerospace Medicine, Radiation Biology, DLR, D-51147 Cologne, GermanyUNSPECIFIED
Moeller, RalfInstitute of Aerospace Medicine, Radiation Biology, DLR, D-51147 Cologne, GermanyUNSPECIFIED
Cadet, JeanLaboratoire Lésions des Acides Nucléiques, Institut Nanosciences et Cryogénie/SCIB UMR-E3 CEA-UJF/CEA Grenoble, 38054 Grenoble, FranceUNSPECIFIED
Douki, ThierryLaboratoire Lésions des Acides Nucléiques, Institut Nanosciences et Cryogénie/SCIB UMR-E3 CEA-UJF/CEA Grenoble, 38054 Grenoble, FranceUNSPECIFIED
Reitz, GuentherInstitute of Aerospace Medicine, Radiation Biology, DLR, D-51147 Cologne, GermanyUNSPECIFIED
Date:2014
Journal or Publication Title:International Journal of Astrobiology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI:10.1017/S1473550414000251
Page Range:pp. 105-114
Publisher:Cambridge University Press
Series Name:CJO2014
ISSN:1473-5504
Status:Published
Keywords:Bacillus subtilis, bacterial spores, International Space Station, Lithopanspermia, space experiment
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Vorhaben Strahlenbiologie (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Radiation Biology
Deposited By: Kopp, Kerstin
Deposited On:13 Jan 2015 14:32
Last Modified:22 Sep 2015 10:46

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