Computer Science – Performance
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001e%26psl.185....1g&link_type=abstract
Earth and Planetary Science Letters, Volume 185, Issue 1-2, p. 1-5.
Computer Science
Performance
21
Scientific paper
A pyrolysis/sublimation technique was developed to isolate volatile amine compounds from a Mars soil analogue inoculated with ~10 billion Escherichia coli cells. In this technique, the inoculated soil is heated to 500°C for several seconds at Martian ambient pressure and the sublimate, collected by a cold finger, then analyzed using high performance liquid chromatography. Methylamine and ethylamine, produced from glycine and alanine decarboxylation, were the most abundant amine compounds detected after pyrolysis of the cells. A heating cycle similar to that utilized in our experiment was also used to release organic compounds from the Martian soil in the 1976 Viking gas chromatography/mass spectrometry (GC/MS) pyrolysis experiment. The Viking GC/MS did not detect any organic compounds of Martian origin above a level of a few parts per billion in the Martian surface soil. Although the Viking GC/MS instruments were not specifically designed to search for the presence of living cells on Mars, our experimental results indicate that at the part per billion level, the degradation products generated from several million bacterial cells per gram of Martian soil would not have been detected.
Bada Jeffrey L.
Botta Oliver
Glavin Daniel P.
Kminek Gerhard
Schubert Marcel
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