Mathematics – Logic
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992stin...9232180i&link_type=abstract
In its JPRS Report: Science and Technology. Central Eurasia: Life Sciences p 10 (SEE N92-32179 22-91) Transl. into ENGLISH from
Mathematics
Logic
Autotrophs, Bacteria, Biomass, Biosphere, Extraterrestrial Life, Mars (Planet), Mars Atmosphere, Meteoritic Composition, Methane, Microorganisms, Carbon, Carbon Dioxide, Carbon 12, Carbon 13, Carbonates, Fractionation, Hydrogen, Metabolism, Rocks, Sulfates
Scientific paper
Researchers have turned the focus of the search for life on Mars to autotrophs that do not need organic carbon. Because the poor ecological conditions on Mars make the possibility of finding photoautotrophs highly unlikely, researchers are now looking for chemolytoautotrophs. Fundamental to the proposed strategy for searching for life on Mars is concentration of efforts on searching for specific ecosystems suited to the functioning of specialized groups of microorganisms such as anaerobes, psychrophiles, and oligotrophs. The most perspective of these are chemolytoautotrophs, methane-producing bacteria which inhabit ecosystems with temperatures of 0-100 C and which can develop in a pH range of 6.0-9.0. It has been found that methane-producing bacteria can fractionate the stable isotopes C-12 and C-13. The results showed that the methane-producing bacteria label the products of their metabolism, methane and biomass, with an increased concentration of C-12. The authors conclude that the data they have cited on the fractionation of carbon isotopes in the chemolytoautotrophic assimilation of CO2 by methane-producing bacteria satisfactorily explain the isotopic composition of SNC meteorites. Finally, a complex of sulfate and isotope-heavy carbonate minerals in association with an isotope-light organic substance forms during a secondary change in the basalt-dunite rock of Mars under conditions of their surface change on the mother planet when solutions containing hydrogen are discharged with active involvement of methane-producing bacteria.
Ivanov Mikhail V.
Lein Alla Y.
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