Biosignatures and geochemical signatures in carbonaceous chondrites.

Details Biosignatures and geochemical signatures in carbonaceous chondrites. Biosignatures and geochemical signatures in carbonaceous chondrites.

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005dps....37.5901a&link_type=abstract

American Astronomical Society, DPS meeting #37, #59.01; Bulletin of the American Astronomical Society, Vol. 37, p.754

Biology

Scientific paper

Sulfate and carbonate are of interest because of their association with evaporites on Mars and on Earth. A suite of carbonaceous chondrites was used for the measurement of oxygen isotopes of sulfate, and the growth of microbial contaminants was observed in the samples. The segregation between biosignatures and geochemical signatures was investigated using amino acid high precision liquid chromatography and microbiology techniques. Many archea and bacteria species are confirmed to grow in the extraterrestrial samples. Their origin and their metabolic impact on oxygen isotopes and amino acids require a systematic catalog of these species. This work was conducted with NASA funding at the University of California San Diego, the Carnegie Institution of Washington and the Scripps Institution of Oceanography.

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