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首页> 外文期刊>Astrobiology >Microbial Survival Rates of Escherichia coli and Deinococcus radiodurans Under Low Temperature, Low Pressure, and UV-Irradiation Conditions, and Their Relevance to Possible Martian Life
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Microbial Survival Rates of Escherichia coli and Deinococcus radiodurans Under Low Temperature, Low Pressure, and UV-Irradiation Conditions, and Their Relevance to Possible Martian Life

机译：低温，低压和紫外线照射条件下大肠埃希氏菌和放射性球菌的微生物存活率及其与可能的火星生命的相关性

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摘要

Viability rates were determined for microbial populations of Escherichia coli and Deinococcus radiodurans under the environmental stresses of low temperature (—35℃), 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.
机译：确定了在低温（-35℃），低压条件（83.3 kPa）和紫外线（UV）辐照（37 W / m〜2）的环境胁迫下，大肠埃希氏菌和放射性杜绝球菌的微生物种群的生存率。在压力测试过程中，生物体以不同的埋藏深度悬浮在咸水土壤和淡水土壤介质中以及海水中。两种生物的微生物种群最容易受到与低压条件相关的脱水压力和紫外线辐射的影响。但是，将其悬浮在液态水介质中并在更大的深度（5厘米）内埋葬可以显着提高生存率。我们的结果表明，几乎没有大气层或水分利用率低的行星表面并不能构成陆地微生物的有利环境。

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