Abstract：
:Viability rates were determined for microbial populations of Escherichia coli and Deinococcus radiodurans under the environmental stresses of low temperature (-35 degrees C), low-pressure conditions (83.3 kPa), and ultraviolet (UV) irradiation (37 W/m(2)). During the stress tests the organisms were suspended in saltwater soil and freshwater soil media, at variable burial depths, and in seawater. Microbial populations of both organisms were most susceptible to dehydration stress associated with low-pressure conditions, and to UV irradiation. However, suspension in a liquid water medium and burial at larger depths (5 cm) improved survival rates markedly. Our results indicate that planetary surfaces that possess little to no atmosphere and have low water availability do not constitute a favorable environment for terrestrial microorganisms.
journal_name
Astrobiologyjournal_title
Astrobiologyauthors
Diaz B,Schulze-Makuch Ddoi
10.1089/ast.2006.6.332subject
Has Abstractpub_date
2006-04-01 00:00:00pages
332-47issue
2eissn
1531-1074issn
1557-8070journal_volume
6pub_type
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