Methanogens as Models for Life on Mars
نویسندگان
چکیده
منابع مشابه
The Effects of Perchlorates on the Permafrost Methanogens: Implication for Autotrophic Life on Mars
The terrestrial permafrost represents a range of possible cryogenic extraterrestrial ecosystems on Earth-like planets without obvious surface ice, such as Mars. The autotrophic and chemolithotrophic psychrotolerant methanogens are more likely than aerobes to function as a model for life forms that may exist in frozen subsurface environments on Mars, which has no free oxygen, inaccessible organi...
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Introduction: Methanogenic archaea, which consume CO2 and H2, have been considered models for possible life forms on Mars for a long time, even before the discovery of methane in the Martian atmosphere (1-8). Several intensive experimental studies have been conducted to investigate survivability of methanogens under conditions that approach those found on Mars (2, 3, 9). Various potential sourc...
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Introduction: The detection of methane in the Martian atmosphere (1-4) and the probability of the existence of liquid water during the early history of Mars (5-10) prompted enthusiasm about plausible life forms on Mars. The half-life of methane in a planetary atmosphere is about 300 years (11), so in order to be detected on Mars, methane would need to be replenished continuously. Several potent...
متن کاملMethanogen Growth in Perchlorate-supplemented Media and Implications for Life in Phoenix-type Soils
Introduction: Perchlorate (ClO4), a highly oxidizing compound, was identified on the martian surface by the Phoenix Lander at concentration levels up to 1.0% [1,2]. There is some debate as to whether an environment with perchlorate salts is too harsh for any organism to survive. Methanogens are able to survive in a numerous unwelcoming environments. Due to their ability to survive in extreme co...
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Introduction: In the search for life on Mars nearsurface soil environments may be important habitats for life accessible to future missions. Serpentinite rocks have been documented on Mars [1], as well as other clay minerals including smectite and kaolinites [2, 3]. Previous studies of soils formed on serpentinites on Earth have documented the formation of extensive clays, including smectite [4...
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