首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Effects of ionizing radiation on the survival of bacterial spores in artificial martian regolith
Authors:Ralf Moeller  Manfred Rohde  Günther Reitz
Institution:a German Aerospace Center, Institute of Aerospace Medicine, Radiation Biology Department, Linder Hoehe, D-51147 Cologne (Köln), Germany
b Helmholtz Centre for Infection Research, Department of Microbial Pathogenesis, Inhoffenstraße 7, D-38124 Braunschweig, Germany
Abstract: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.
Keywords:Mars  Regoliths  Astrobiology  Exobiology
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号