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dc.contributor.authorCrisler, James D.
dc.contributor.authorNewville, T.M.
dc.contributor.authorChen, Fei
dc.contributor.authorClark, Benton C.
dc.contributor.authorSchneegurt, Mark A.
dc.date.accessioned2012-03-21T15:42:01Z
dc.date.available2012-03-21T15:42:01Z
dc.date.issued2012-02
dc.identifier.citationCrisler J.D., Newville T.M., Schneegurt M.A., Chen F., and Clark B.C. 2012. "Bacterial growth at the high concentrations of magnesium sulfate found in martian soils". Astrobiology. 12 (2): 98-106.en_US
dc.identifier.issn1531-1074
dc.identifier.issn1557-8070
dc.identifier.otherWOS: 000300523100002
dc.identifier.urihttp://hdl.handle.net/10057/4914
dc.identifier.urihttp://dx.doi.org/10.1089/ast.2011.0720
dc.descriptionClick on the DOI link below to access the article (may not be free).en_US
dc.description.abstractThe martian surface environment exhibits extremes of salinity, temperature, desiccation, and radiation that would make it difficult for terrestrial microbes to survive. Recent evidence suggests that martian soils contain high concentrations of MgSO₄ minerals. Through warming of the soils, meltwater derived from subterranean ice-rich regolith may exist for an extended period of time and thus allow the propagation of terrestrial microbes and create significant bioburden at the near surface of Mars. The current report demonstrates that halotolerant bacteria from the Great Salt Plains (GSP) of Oklahoma are capable of growing at high concentrations of MgSO₄ in the form of 2 M solutions of epsomite. The epsotolerance of isolates in the GSP bacterial collection was determined, with 35% growing at 2 M MgSO₄. There was a complex physiological response to mixtures of MgSO₄ and NaCl coupled with other environmental stressors. Growth also was measured at 1 M concentrations of other magnesium and sulfate salts. The complex responses may be partially explained by the pattern of chaotropicity observed for high-salt solutions as measured by agar gelation temperature. Select isolates could grow at the high salt concentrations and low temperatures found on Mars. Survival during repetitive freeze-thaw or drying-rewetting cycles was used as other measures of potential success on the martian surface. Our results indicate that terrestrial microbes might survive under the high-salt, low-temperature, anaerobic conditions on Mars and present significant potential for forward contamination. Stringent planetary protection requirements are needed for future life-detection missions to Mars.en_US
dc.language.isoen_USen_US
dc.publisherMary Ann Lieberten_US
dc.relation.ispartofseriesAstrobiology;2012:, v.12, no.2
dc.subjectAnalogueen_US
dc.subjectMarsen_US
dc.subjectPlanetary protectionen_US
dc.subjectSaltsen_US
dc.subjectLife in extreme environmentsen_US
dc.titleBacterial growth at the high concentrations of magnesium sulfate found in martian soilsen_US
dc.typeArticleen_US
dc.description.versionPeer reviewed article
dc.rights.holderCopyright © 2012, Astrobiology Society


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