Biology
Scientific paper
Mar 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.545...59r&link_type=abstract
In: Proceedings of the Third European Workshop on Exo-Astrobiology, 18 - 20 November 2003, Madrid, Spain. Ed.: R. A. Harris & L.
Biology
Earth: Astrobiology
Scientific paper
Deinococcus radiodurans, a gram positive bacterium whose ability to survive extremely high damage to its DNA which is for example induced by genotoxic chemicals, ionizing radiation, UV radiation or desiccation is still not completely understood. Because of its radiation and desiccation resistance, this extremophile is a prime candidate for possibly surviving environmental conditions as they occur on Mars and during a hypothetical interplanetary space travel. So far just minor work has been done on the damaging effects of UV radiation, especially polychromatic UV radiation in the UVB and UVA range, and desiccation/vacuum exposure, which is known to induce DNA damages similar to radiation. Therefore, we started to further investigate the radiation resistance and the repair mechanisms of Deinococcus radiodurans, concentrating on the effect of polychromatic UV radiation and desiccation in the wild type strain and ionizing radiation and UV radiation sensitive mutants. The results of this ongoing project will be of great interest to questions concerning planetary protection, spacecraft disinfecting measures and the search for life on other earth-like planets in general.
de La Vega U.
Horneck Gerda
Rettberg Petra
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