Astrobiological significance of chemolithoautotrophic acidophiles

Elena V. Pikuta; Richard B. Hoover

doi:10.1117/12.513419

10 February 2004 Astrobiological significance of chemolithoautotrophic acidophiles

Elena V. Pikuta, Richard B. Hoover

Proceedings Volume 5163, Instruments, Methods, and Missions for Astrobiology VII; (2004) https://doi.org/10.1117/12.513419
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

For more than a century (since Winogradsky discovered lithautotrophic bacteria) there has been a dilemma in microbiology about life that first inhabited the Earth. Which types of life forms first appeared in the primordial oceans during the earliest geological period on Earth as the primary ancestors of modern biological diversity? How did a metabolism of ancestors evolve: from lithoautotrophic to lithoheterotrophic and organoheterotrophic or from organoheterotrophic to organautotrophic and lithomixotrophic types? At the present time, it is known that chemolithoheterotrophic and chemolithoautotrophic metabolizing bacteria are wide spread in different ecosystems. On Earth the acidic ecosystems are associated with geysers, volcanic fumaroles, hot springs, deep sea hydrothermal vents, caves, acid mine drainage and other technogenic ecosystems. Bioleaching played a significant roel on a global geological scale during the Earth's formation. This important feature of bacteria has been successfully applied in industry. The lithoautotrophs include Bacteria and Archaea belonging to diverse genera containing thermophilic and mesophilic species. In this paper we discuss the lithotrophic microbial acidophiles and present some data with a description of new acidophilic iron- and sulfur-oxidizing bacterium isolated from the Chena Hot Springs in Alaska. We also consider the possible relevance of microbial acidophiles to Venus, Io, and acidic inclusions in glaciers and icy moons.

Citation Download Citation

Elena V. Pikuta and Richard B. Hoover "Astrobiological significance of chemolithoautotrophic acidophiles", Proc. SPIE 5163, Instruments, Methods, and Missions for Astrobiology VII, (10 February 2004); https://doi.org/10.1117/12.513419

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