Biology
Scientific paper
Jan 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4939..160s&link_type=abstract
Instruments, Methods, and Missions for Astrobiology VI. Edited by Hoover, Richard B.; Rozanov, Alexei Yu.; Lipps, Jere H. Pr
Biology
Scientific paper
The Earst-European platform Archean crystalline basement rocks opened by Vorotilov Deep Well (VDW) were studied within depths 2575 - 2805 m. VDW was drilled through Puchezh-Katunki impact structure and opened some rocks characterized by high magnetic saturation. Micro-dispersed structure of magnetite indicated on a possibility of its biogenic origin. Really some pure cultures of magnet-ordered compound producing bacilli were isolated. Thus, the identification of fatty acids and other lipid components of microbial cells inside rocks was made to establish the iron reduction role in common biochemical activity in deep subsurface. 34 microbial lipid markers were detected by gas chromatography -- mass-spectrometry and 22 species were identidied by private database. Bacteria of g. Bacillus reached 6.8% in subsurface communities. However, representatives of gg. Clostridium (37.1 - 33.2%) and Rhodococcus (27.6 - 33.7%) were absolute dominants within studied depth interval. Geochemical conditions in situ as well as physiological features of these micro-organisms allow to constitute a following trophic chain: subsurface fluid hyudrocarbons --> it oxidizing rhodococci --> free aminoacids and biomass proteins (products of rhodococci metabolism) --> it fermenting clostridia. This syntrophic association may be a new basement for subsurface ecosystem and can support the magnet-ordered compounds production.
Osipov George A.
Pevzner Lev A.
Shekhovtsova Nina V.
Verkhovtseva Nadejda V.
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