Document Detail

Growth of Carnobacterium spp. from permafrost under low pressure, temperature, and anoxic atmosphere has implications for Earth microbes on Mars.
MedLine Citation:
PMID:  23267097     Owner:  NLM     Status:  MEDLINE    
The ability of terrestrial microorganisms to grow in the near-surface environment of Mars is of importance to the search for life and protection of that planet from forward contamination by human and robotic exploration. Because most water on present-day Mars is frozen in the regolith, permafrosts are considered to be terrestrial analogs of the martian subsurface environment. Six bacterial isolates were obtained from a permafrost borehole in northeastern Siberia capable of growth under conditions of low temperature (0 °C), low pressure (7 mbar), and a CO(2)-enriched anoxic atmosphere. By 16S ribosomal DNA analysis, all six permafrost isolates were identified as species of the genus Carnobacterium, most closely related to C. inhibens (five isolates) and C. viridans (one isolate). Quantitative growth assays demonstrated that the six permafrost isolates, as well as nine type species of Carnobacterium (C. alterfunditum, C. divergens, C. funditum, C. gallinarum, C. inhibens, C. maltaromaticum, C. mobile, C. pleistocenium, and C. viridans) were all capable of growth under cold, low-pressure, anoxic conditions, thus extending the low-pressure extreme at which life can function.
Wayne L Nicholson; Kirill Krivushin; David Gilichinsky; Andrew C Schuerger
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2012-12-24
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  110     ISSN:  1091-6490     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-01-09     Completed Date:  2013-03-07     Revised Date:  2013-07-11    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  666-71     Citation Subset:  IM    
Department of Microbiology and Cell Science, Space Life Sciences Laboratory, University of Florida, Merritt Island, FL 32953, USA.
Data Bank Information
Bank Name/Acc. No.:
GENBANK/JX110652;  JX110653;  JX110654;  JX110655;  JX110656;  JX110657
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MeSH Terms
Atmospheric Pressure
Base Sequence
Carnobacterium / genetics*,  growth & development*
Cluster Analysis
DNA, Ribosomal / genetics
Extraterrestrial Environment*
Molecular Sequence Data
Sequence Analysis, DNA
Soil Microbiology*
Species Specificity
Reg. No./Substance:
0/DNA, Ribosomal

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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