Thermophilic fermentative bacteria from a deep borehole in granitic rock in Sweden

Ulrich Szewzyk; Regine Szewzyk; Thor-Axel Stenstroem

doi:10.1117/12.278787

11 July 1997 Thermophilic fermentative bacteria from a deep borehole in granitic rock in Sweden

Ulrich Szewzyk, Regine Szewzyk, Thor-Axel Stenstroem

Proceedings Volume 3111, Instruments, Methods, and Missions for the Investigation of Extraterrestrial Microorganisms; (1997) https://doi.org/10.1117/12.278787
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

A borehole drilled to a final depth of 6779 m in granitic rock in Gravberg, Sweden, was sampled and examined for the presence and activity of anaerobic bacteria. The application of anaerobic enrichment and isolation techniques resulted in pure cultures of various fermenting bacteria. Growth in enrichment cultures was observed only in those cultures inoculated from water samples from a depth of 3500 m. Pure cultures of anaerobic, fermenting bacteria were obtained with the following substrates: glucose, starch, xylane, ethanol, and lactate. All isolated bacteria were so far undiscribed bacteria by means of their physiological properties. One strain of the glucose fermenting bacteria was further characterized concerning its phylogenetic position and was found to be closest related to Clostridium thermohydrosulfuricum. However, by means of its characteristic metabolism, it was clearly separated from C. thermohydrosulfuricum. No sulfate-reducing or methanogenic bacteria were found in any of the samples. Fermentative bacteria growing in the presence of hematite often reduced the iron and induced the formation and deposition of insoluble iron sulfides.

Citation Download Citation

Ulrich Szewzyk, Regine Szewzyk, and Thor-Axel Stenstroem "Thermophilic fermentative bacteria from a deep borehole in granitic rock in Sweden", Proc. SPIE 3111, Instruments, Methods, and Missions for the Investigation of Extraterrestrial Microorganisms, (11 July 1997); https://doi.org/10.1117/12.278787

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