Effects of ionizing radiation on the survival of bacterial spores in artificial martian regolith

Details Effects of ionizing radiation on the survival of bacterial spores in artificial martian regolith Effects of ionizing radiation on the survival of bacterial spores in artificial martian regolith

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010icar..206..783m&link_type=abstract

Icarus, Volume 206, Issue 2, p. 783-786.

Physics

2

Scientific paper

Bacterial spores of Bacillus subtilis were used as a model system to study the effects of ionizing radiation on the survivability of spores uncovered and covered with artificial martian regolith. Spore survival after X-ray exposure was mainly depending on the role of non-homologous end-joining (NHEJ) as the major DNA double-strand break repair pathway during germination, the involvement of major small, acid-soluble spore proteins (SASP) as DNA radioprotectants and the coverage by martian regolith, whereas spores covered with martian regolith were significantly more sensitive to X-rays than uncovered spores, which is mainly due to the interaction of X-rays with artificial martian regolith resulting in the formation of secondary electrons and reactive oxygen species.

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