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NASA study will help stop stowaways to Mars
Date:9/2/2007

NASA clean rooms, where scientists and engineers assemble spacecraft, have joined hot springs, ice caves, and deep mines as unlikely places where scientists have discovered ultra-hardy organisms collectively known as extremophiles. Some species of bacteria uncovered in a recent NASA study have never been detected anywhere else.

According to Dr. Kasthuri Venkateswaran, who led the study conducted at NASAs Jet Propulsion Laboratory in Pasadena, California, These findings will advance the search for life on Mars and other worlds both by sparking improved cleaning and sterilization methods and by preventing false-positive results in future experiments to detect extraterrestrial life.

NASA builds its spacecraft in rooms designed to minimize contamination by airborne particles because dust and its microbial passengers can foul instruments and invalidate experiments. If scientists someday find microbes on Mars, they will want to be sure they arent just hitchhikers from Earth.

Clean rooms used in the space program already undergo extensive cleaning and air filtering procedures, and the detection technology employed in this study will help NASA to develop and monitor improvements. Still, it is extremely difficult to eliminate all dust particles and microbes without damaging the electronic instruments the process is intended to protect.

Identifying and archiving clean-room microbes serves as an effective backup to the cleaning and sterilization efforts. Armed with a list of microbes that could possibly stow away on its spacecraft, NASA can disregard them if they turn up in future Martian samples.

As reported in FEMS Microbiology Ecology, a journal of the Federation of European Microbiological Societies, Venkateswarans team used a technology known as ribosomal RNA gene-sequence analysis to detect bacteria in clean rooms at Kennedy Space Center, Johnson Space Center, and the Jet Propulsion Laboratory. This was the first time tha
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Contact: Lucy Mansfield
lucy.mansfield@oxon.blackwellpublishing.com
44-186-547-6241
Blackwell Publishing Ltd.
Source:Eurekalert

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