| Autor: |
Alanna M. Small, Richard C. Quinn, Fred A. Rainey, José de la Rosa, Rafael Navarro-González, Frank J. Grunthaner, Patrice Coll, François Raulin, Danielle Bagaley, Luis Cáceres, Robert Sternberg, Becky J. Hollen, P. Molina, Christopher P. McKay, Arnaud Buch, Benito Gómez-Silva |
| Rok vydání: |
2004 |
| Předmět: |
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| Zdroj: |
Cellular Origin and Life in Extreme Habitats and Astrobiology ISBN: 9781402030932 |
| DOI: |
10.1007/978-94-007-1003-0_44 |
| Popis: |
The data obtained from the Viking lander’s analyses of soils on Mars were unexpected. First, was the finding that when soil samples were exposed to water vapor in the gas exchange experiment (GE) there was rapid release of molecular oxygen, at levels of 70-770 nmole g-1 (Oyama and Berdahl, 1977). The next puzzling result was that organic material in the labeled release experiment (LR) was consumed as would be expected if life would have been present (Levin and Straat, 1977). Lastly, there were no organic materials at levels of part-per-billion (ppb), as measured by pyrolysis-gas chromatography-mass spectrometry (pyr-GC-MS) detected (Biemann et al., 1977); which were in apparent contradiction with the presence of life as detected by the LR experiment. The reactivity of the martian soil is currently believed to result from the presence of one or more inorganic oxidants (e.g., superoxides, peroxides, or peroxynitrates) at the part-per-million (ppm) level. The absence of organics in the soils results from their oxidation by such oxidants and/or direct ultraviolet radiation damage (McKay et al., 1998). |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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