1. Electron Acceptors and Carbon Sources for a Thermoacidophilic Archaea

    The thin line of Earth's atmosphere and the setting sun are featured in this image photographed by the crew of the International Space Station while space shuttle Atlantis on the STS-129 mission was docked with the station. Source: NASA Image credit: None
    The thin line of Earth's atmosphere and the setting sun are featured in this image photographed by the crew of the International Space Station while space shuttle Atlantis on the STS-129 mission was docked with the station. Source: NASA

    Researchers have uncovered details about the versatile energy metabolism of the thermoacidophilic archaea, Acidianus strain DS80. This organism grows both autotrophically and heterotrophically with a range of electron acceptors. The new study examines the growth response of strain DS80 to varying electron acceptors (sulfur, ferric iron, or oxygen), and the amount of CO2 assimilated into biomass under each set of conditions. The study ties carbon sources used by DS80 to electron acceptor availability.

    Microbial metabolism is essential in global biogeochemical cycles that affect the habitability of Earth. Studying the activities of microorganisms and their role in the environment is useful for understanding our planet, and provides insight into more general principles of habitability that could be applicable to other worlds.

    The study, “Electron Acceptor Availability Alters Carbon and Energy Metabolism in a Thermoacidophile,” was published in the journal Environmental Microbiology. The work was supported by NASA Astrobiology through the Exobiology Program and NASA Astrobiology Institute.

    Source: [Astrobiology at NASA]