{"id":752,"date":"2011-10-05T11:06:47","date_gmt":"2011-10-05T11:06:47","guid":{"rendered":"https:\/\/www.cnpem.staging.wpengine.com\/?p=752"},"modified":"2026-03-03T10:13:37","modified_gmt":"2026-03-03T13:13:37","slug":"comparative-survival-analysis-of-d-radiodurans-n-magadii-and-h-volcanii-exposed-to-vacuum-ultraviolet-irradiationcomparative-survival-analysis-of-d-radiodurans-n-magadii-and-h-volcanii-expos","status":"publish","type":"post","link":"https:\/\/cnpem.br\/en\/comparative-survival-analysis-of-d-radiodurans-n-magadii-and-h-volcanii-exposed-to-vacuum-ultraviolet-irradiationcomparative-survival-analysis-of-d-radiodurans-n-magadii-and-h-volcanii-expos\/","title":{"rendered":"Comparative Survival Analysis of D. radiodurans, N. magadii, and H. volcanii Exposed to Vacuum Ultraviolet Irradiation"},"content":{"rendered":"

Espace Ref em 03\/10\/2011<\/em><\/p>\n

The haloarchaea Natrialba magadii and Haloferax volcanii, as well as the radiation-resistant bacterium Deinococcus radiodurans, were exposed to vacuum-UV (V-UV) radiation at the Brazilian Synchrotron Light Laboratory (LNLS). Cell monolayers (containing 105 – 106 cells per sample) were prepared over polycarbonate filters and irradiated under high vacuum (10-5 Pa) with polychromatic synchrotron radiation. N. magadii was remarkably resistant to high vacuum with a survival fraction of ((3.77 +\/- 0.76) x 10-2), larger than the one of D. radiodurans ((1.13 +\/- 0.23) x 10-2). The survival fraction of the haloarchaea H. volcanii, of ((3.60 +\/- 1.80) x 10-4), was much smaller. Radiation resistance profiles were similar between the haloarchaea and D. radiodurans for fluencies up to 150 J m-2. For fluencies larger than 150 J -2 there was a significant decrease in the survival of haloarchaea, and in particular H. volcanii did not survive. Survival for D. radiodurans was 1% after exposure to the higher V-UV fluency (1350 J m-2) while N. magadii had a survival lower than 0.1%. Such survival fractions are discussed regarding the possibility of interplanetary transfer of viable micro-organisms and the possible existence of microbial life in extraterrestrial salty environments such as the planet Mars and the Jupiter’s moon Europa. This is the first work reporting survival of haloarchaea under simulated interplanetary conditions.<\/p>\n

Full paper<\/a><\/p>\n

Comments: Draft version (without figures), Accepted for publication in Astrobiology
\nSubjects: Earth and Planetary Astrophysics (astro-ph.EP)
\nCite as: arXiv:1109.6590v1 [astro-ph.EP]
\nSubmission history
\nFrom: Ximena Celeste Abrevaya [view email]
\n[v1] Thu, 29 Sep 2011 17:02:52 GMT (131kb) <\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Espace Ref em 03\/10\/2011 The haloarchaea Natrialba magadii and Haloferax volcanii, as well as the radiation-resistant bacterium Deinococcus radiodurans, were exposed to vacuum-UV (V-UV) radiation at the Brazilian Synchrotron Light…<\/p>\n","protected":false},"author":17,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[1163,12],"tags":[931,932,933,934,8,935,936],"class_list":["post-752","post","type-post","status-publish","format-standard","hentry","category-clipping-cnpem","category-clipping-lnls","tag-comparative-survival-analysis","tag-d-radiodurans","tag-exposed","tag-h-volcanii","tag-lnls","tag-n-magadii","tag-vacuum-ultraviolet-irradiation","category-1163","category-12","description-off"],"acf":[],"yoast_head":"\nComparative Survival Analysis of D. radiodurans, N. magadii, and H. volcanii Exposed to Vacuum Ultraviolet Irradiation - 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