A Keck School scientist and his collaborators are the first to find methane-producing bacteria in arid desert soils, providing a springboard for future experiments on the distant planet. Evidence of methane-producing organisms can be found in inhospitable soil environments much like those found on the surface of Mars, according to experiments undertaken by scientists and students from the Keck School of Medicine of USC and the University of Arkansas and published online in the journal Icarus. The results, they said, provide ample impetus for similar “biodetection experiments” to be considered for future missions to Mars. “Methane-producing organisms are the ones most likely to be found on Mars,” noted Joseph Miller, associate professor of cell and neurobiology in the Keck School and one of the study’s lead researchers. “And, in fact, methane was detected on Mars last year.” Methane is considered to be a biological signature for certain living organisms that metabolize organic matter under conditions of low or no oxygen. Terrestrial methanogens (methane-producers) are typically found in environments largely protected from atmospheric oxygen, such as peat bogs, oceanic methane ices and anoxic levels of the ocean. But they previously had not been detected in an arid desert environment.

To see if methane could be found in Mars-like soil, the investigators collected soil and vapor samples from the arid environment of the Mars Desert Research Station in Utah and then compared them with vapor samples taken from the Idaho High Desert and soil samples from Death Valley, the Arctic and the Atacama desert in Chile. Three of five vapor samples from the Utah site showed the presence of methane; there was no methane found in any of the vapor samples from Idaho. Similarly, while five of 40 soil samples from Utah produced methane after the addition of growth medium to the samples – indicating that the methane was being given off by a biological organism, most likely a bacterium – none of the other soil samples showed signs of methane production.

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there is a big difference between utal and mars soils. but however the find of methane is pointing to fact' mar had bacteria. the more missions to mars the answers we shall find.

just recently i read an article about how Mars has turned GREEN actually!...it is beleived that there might be life starting to produce there...of course, these would probably be just plants or something...evolutionary biological beings won't come into existance till we make some to live on Mars

It's all speculation. We are still assuming that life on Mars , if any , would look similar to life here. And it may. I would love to see a life form with a silicon base rather than carbon. Just to screw up the Scientific Community!