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Survival of MASE strains under different aspects of simulated Martian conditions

Beblo-Vranesevic, Kristina and Bohmeier, M. and Rettberg, Petra and Schwendner, P. and Cockell, C.S. (Coordinator) and Perras, A. and Moissl-Eichinger, C. and Gaboyer, F. and Westall, F. and Walter, N. and Garcia-Descalzo, L. and Gomez, F. and Malki, M. and Amils, R. and Monaghan, E. and Ehrenfreund, P. and Vannier, P. and Marteinsson, V. (2017) Survival of MASE strains under different aspects of simulated Martian conditions. EANA 2017, 14.-17. August, 2017, Aarhus, Denmark.

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Abstract

During the project MASE (Mars Analogues for Space Exploration) several microbial isolates were obtained and some of these strains were subjected to Mars relevant environmental stress factors in the laboratory under controlled conditions; e.g. radiation, low water activity, high salt concentrations, oxidizing compounds. All sampling, isolation, and cultivation steps, as well as the stress tests were performed under anoxic conditions. So far, five only distantly related microorganisms are under detailed investigation: \textit{Buttiauxella} sp. MASE-IM-7, \textit{Clostridium} sp. MASE-IM-4, \textit{Halanaerobium} sp. MASE-BB-1, \textit{Trichococcus} sp. MASE-IM-5, and \textit{Yersinia} sp. MASE-LG-1. It was shown that tolerance to desiccation and to ionizing radiation, applied separately was not correlated. If desiccation and exposure to radiation was applied together typical additive effects could be observed in each species. The survival after addition of oxidizing compounds (hydrogen peroxide; perchlorates) for a dedicated time (15 minutes; 24 hours) was very divers. If the five microorganisms were compared with each other, \textit{Trichococcus} sp. MASE-IM-5 was the most sensitive strain and survived only 10 mM hydrogen peroxide for 15 minutes and 24 hours, respectively. The most tolerant organism was \textit{Halanaerobium} sp. MASE-BB-1 which was able to survive 100 mM hydrogen peroxide for both tested time points. In between, the other Bacteria were arranged with different tolerances against hydrogen peroxide. Comparable, species specific results were obtained after the addition of different perchlorates. In general, the strategy of the MASE project has proven to be useful to gain new model microorganisms. The isolated and characterized MASE strains have so far unknown high tolerances against cell damaging treatments and may serve as model organisms for future space exposure experiments.

Item URL in elib:https://elib.dlr.de/114339/
Document Type:Conference or Workshop Item (Speech)
Title:Survival of MASE strains under different aspects of simulated Martian conditions
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Beblo-Vranesevic, Kristinaradiation biology department, institute of aerospace medicine, german aerospace center (dlr), cologne, germanyhttps://orcid.org/0000-0002-4834-7121
Bohmeier, M.radiation biology department, institute of aerospace medicine, german aerospace center (dlr), cologne, germanyUNSPECIFIED
Rettberg, Petraradiation biology department, institute of aerospace medicine, german aerospace center (dlr), cologne, germany; petra.rettberg (at) dlr.dehttps://orcid.org/0000-0003-4439-2395
Schwendner, P.(GB)UNSPECIFIED
Cockell, C.S. (Coordinator)(GB)UNSPECIFIED
Perras, A.(AT)UNSPECIFIED
Moissl-Eichinger, C.(AT)UNSPECIFIED
Gaboyer, F.(F)UNSPECIFIED
Westall, F.(F)UNSPECIFIED
Walter, N.(F)UNSPECIFIED
Garcia-Descalzo, L.(ES)UNSPECIFIED
Gomez, F.(ES)UNSPECIFIED
Malki, M.(ES)UNSPECIFIED
Amils, R.(ES)UNSPECIFIED
Monaghan, E.(NL)UNSPECIFIED
Ehrenfreund, P.(NL)UNSPECIFIED
Vannier, P.(IS)UNSPECIFIED
Marteinsson, V.(IS)UNSPECIFIED
Date:2017
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:MASE (Mars Analogues for Space Exploration)
Event Title:EANA 2017
Event Location:Aarhus, Denmark
Event Type:international Conference
Event Dates:14.-17. August, 2017
Organizer:European Astrobiology Network Association
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 - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Strahlenbiologie
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Radiation Biology
Deposited By: Kopp, Kerstin
Deposited On:25 Sep 2017 13:58
Last Modified:31 Jul 2019 20:11

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