Article: New astrobiology study results reported from National Autonomous University.

"A key goal for astrobiology is the search for evidence of life on Mars. Because liquid water is a fundamental environmental requirement for life, the recent set of missions to Mars have focused on a strategy known as ''follow the water.'' Since life is made of organic molecules, a logical next step is ''follow the organics.'' However, organics are expected to be present at very low levels on Mars, which would make their detection challenging," researchers in Mexico report.

"Viking was unable to detect organics at parts per billion (ppb), but the effective upper limit could be higher due to the low efficiency of the thermal volatilization (TV) step in releasing ...

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