Effects of Desiccation and Freezing on Microbial Ionizing Radiation Survivability: Considerations for Mars Sample Return.
Bacillus
DNA repair
Deinococcus
Desiccation
EPR
Escherichia
Freezing
Holliday junction
Ionizing radiation
Mars
Mn antioxidants
Planetary protection
ROS
Saccharomyces.
Spores
Vegetative cells
Journal
Astrobiology
ISSN: 1557-8070
Titre abrégé: Astrobiology
Pays: United States
ID NLM: 101088083
Informations de publication
Date de publication:
11 2022
11 2022
Historique:
pubmed:
26
10
2022
medline:
4
11
2022
entrez:
25
10
2022
Statut:
ppublish
Résumé
Increasingly, national space agencies are expanding their goals to include Mars exploration with sample return. To better protect Earth and its biosphere from potential extraterrestrial sources of contamination, as set forth in the Outer Space Treaty of 1967, international efforts to develop planetary protection measures strive to understand the danger of cross-contamination processes in Mars sample return missions. We aim to better understand the impact of the martian surface on microbial dormancy and survivability. Radiation resistance of microbes is a key parameter in considering survivability of microbes over geologic times on the frigid, arid surface of Mars that is bombarded by solar and galactic cosmic radiation. We tested the influence of desiccation and freezing on the ionizing radiation survival of six model microorganisms: vegetative cells of two bacteria (
Identifiants
pubmed: 36282180
doi: 10.1089/ast.2022.0065
pmc: PMC9618380
doi:
Types de publication
Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Research Support, N.I.H., Extramural
Research Support, N.I.H., Intramural
Langues
eng
Sous-ensembles de citation
IM
Pagination
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