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Survival of Spores of the UV-Resistant Bacillus subtilis Strain MW01 After Exposure to Low-Earth Orbit and Simulated Martian Conditions: Data from the Space Experiment ADAPT on EXPOSE-E

Wassmann, Marko and Moeller, Ralf and Rabbow, Elke and Panitz, Corinna and Horneck, Gerda and Reitz, Günther and Douki, Thierry and Cadet, Jean and Stan-Lotter, Helga and Cockell, Charles S. and Rettberg, Petra (2012) Survival of Spores of the UV-Resistant Bacillus subtilis Strain MW01 After Exposure to Low-Earth Orbit and Simulated Martian Conditions: Data from the Space Experiment ADAPT on EXPOSE-E. Astrobiology, 12 (5), pp. 498-507. Mary Ann Liebert, Inc.. DOI: 10.1089/ast.2011.0772.

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Abstract

In the space experiment ‘‘Molecular adaptation strategies of microorganisms to different space and planetary UV climate conditions’’ (ADAPT), bacterial endospores of the highly UV-resistant Bacillus subtilis strain MW01 were exposed to low-Earth orbit (LEO) and simulated martian surface conditions for 559 days on board the European Space Agency’s exposure facility EXPOSE-E, mounted outside the International Space Station. The survival of B. subtilis MW01 spores from both assays (LEO and simulated martian conditions) was determined by a colonyformation assay after retrieval. It was clearly shown that solar extraterrestrial UV radiation (λ ≥ 110 nm) as well as the martian UV spectrum (λ ≥ 200 nm) was the most deleterious factor applied; in some samples only a few spore survivors were recovered from B. subtilis MW01 spores exposed in monolayers. However, if shielded from solar irradiation, about 8% of MW01 spores survived in LEO conditions, and 100% survived in simulated martian conditions, compared to the laboratory controls. The results demonstrate the effect of shielding against the high inactivation potential of extraterrestrial solar UV radiation, which limits the chances of survival of even the highly UV-resistant strain of B. subtilis MW01 in the harsh environments of outer space and the martian surface.

Document Type:Article
Title:Survival of Spores of the UV-Resistant Bacillus subtilis Strain MW01 After Exposure to Low-Earth Orbit and Simulated Martian Conditions: Data from the Space Experiment ADAPT on EXPOSE-E
Authors:
AuthorsInstitution or Email of Authors
Wassmann, Marko Radiation Biology Department, Institute of Aerospace Medicine, German Aerospace Center (DLR), Cologne, Germany.
Moeller, Ralf Radiation Biology Department, Institute of Aerospace Medicine, German Aerospace Center (DLR), Cologne, Germany.
Rabbow, Elke Radiation Biology Department, Institute of Aerospace Medicine, German Aerospace Center (DLR), Cologne, Germany.
Panitz, Corinna RWTH Aachen University, University Hospital Aachen (UKA), Institute of Flight Medicine, Aachen, Germany.
Horneck, Gerda Radiation Biology Department, Institute of Aerospace Medicine, German Aerospace Center (DLR), Cologne, Germany.
Reitz, Günther Radiation Biology Department, Institute of Aerospace Medicine, German Aerospace Center (DLR), Cologne, Germany.
Douki, Thierry Laboratoire ‘‘Lésions des Acides Nucléiques,’’ SCIB-UMR-E n°3 (CEA/UJF) Institut Nanosciences et Cryogénie CEA/Grenoble, Grenoble.
Cadet, Jean Laboratoire ‘‘Lésions des Acides Nucléiques,’’ SCIB-UMR-E n°3 (CEA/UJF) Institut Nanosciences et Cryogénie CEA/Grenoble, Grenoble.
Stan-Lotter, HelgaDepartment of Microbiology, University of Salzburg, Salzburg, Austria.
Cockell, Charles S. School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK.
Rettberg, Petra Radiation Biology Department, Institute of Aerospace Medicine, German Aerospace Center (DLR), Cologne, Germany.
Date:2012
Journal or Publication Title:Astrobiology
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:12
DOI:10.1089/ast.2011.0772
Page Range:pp. 498-507
Publisher:Mary Ann Liebert, Inc.
Status:Published
Keywords:Bacterial spores, Radiation resistance, Adaptation, LEO, Mars
HGF - Research field:Aeronautics, Space and Transport, Aeronautics, Space and Transport (old)
HGF - Program:Space, Space (old)
HGF - Program Themes:Research under Space Conditions, W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Raumfahrt, Space
DLR - Program:R FR - Forschung unter Weltraumbedingungen, W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Strahlenbiologie, W - Vorhaben Strahlenbiologie (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Radiation Biology
Deposited By: Kerstin Kopp
Deposited On:08 Aug 2012 15:25
Last Modified:20 Mar 2013 19:45

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