%0 Journal Article %1 735 %A Popa, Radu %A Smith, Amy R. %A Popa, Rodica %A Boone, Jane %A Fisk, Martin %D 2012 %J Astrobiology %K imported %P 9 - 18 %R 10.1089/ast.2011.0639 %T Olivine-Respiring Bacteria Isolated from the Rock-Ice Interface in a Lava-Tube Cave, a Mars Analog Environment %U http://online.liebertpub.com/doi/abs/10.1089/ast.2011.0639 %V 12 %X <p>The boundary between ice and basalt on Earth is an analogue for some near-surface environments of Mars. We investigated neutrophilic iron-oxidizing microorganisms from the basalt-ice interface in a lava tube from the Oregon Cascades with perennial ice. One of the isolates (<em>Pseudomonas</em> sp. HerB) can use ferrous iron Fe(II) from the igneous mineral olivine as an electron donor and O₂ as an electron acceptor. The optimum growth temperature is \~12–14°C, but growth also occurs at 5°C. Bicarbonate is a facultative source of carbon. Growth of <em>Pseudomonas</em>sp. HerB as a chemolithotrophic iron oxidizer with olivine as the source of energy is favored in low O₂ conditions (<em>e.g</em>.<em>,</em> 1.6\% O₂). Most likely, microbial oxidation of olivine near pH 7 requires low O₂ to offset the abiotic oxidation of iron. The metabolic capabilities of this bacterium would allow it to live in near-surface, icy, volcanic environments of Mars in the present or recent geological past and make this type of physiology a prime candidate in the search for life on Mars. Key Words: Extremophiles—Mars—Olivine—Iron-oxidizing bacteria—Redox. Astrobiology 12, 9–18.</p>

@article{735, abstract = {<p>The boundary between ice and basalt on Earth is an analogue for some near-surface environments of Mars. We investigated neutrophilic iron-oxidizing microorganisms from the basalt-ice interface in a lava tube from the Oregon Cascades with perennial ice. One of the isolates (<em>Pseudomonas</em> sp. HerB) can use ferrous iron Fe(II) from the igneous mineral olivine as an electron donor and O₂ as an electron acceptor. The optimum growth temperature is \~{}12{\textendash}14{\textdegree}C, but growth also occurs at 5{\textdegree}C. Bicarbonate is a facultative source of carbon. Growth of <em>Pseudomonas</em>sp. HerB as a chemolithotrophic iron oxidizer with olivine as the source of energy is favored in low O₂ conditions (<em>e.g</em>.<em>,</em> 1.6\% O₂). Most likely, microbial oxidation of olivine near pH 7 requires low O₂ to offset the abiotic oxidation of iron. The metabolic capabilities of this bacterium would allow it to live in near-surface, icy, volcanic environments of Mars in the present or recent geological past and make this type of physiology a prime candidate in the search for life on Mars. Key Words: Extremophiles{\textemdash}Mars{\textemdash}Olivine{\textemdash}Iron-oxidizing bacteria{\textemdash}Redox. Astrobiology 12, 9{\textendash}18.</p> }, added-at = {2015-06-25T20:36:36.000+0200}, author = {Popa, Radu and Smith, Amy R. and Popa, Rodica and Boone, Jane and Fisk, Martin}, biburl = {https://www.bibsonomy.org/bibtex/25dc39db886ce17146c425a14de9a82e8/janicak}, doi = {10.1089/ast.2011.0639}, extra = {155}, interhash = {4b9e97cfeaef60a80dfb8571b0ff287a}, intrahash = {5dc39db886ce17146c425a14de9a82e8}, journal = {Astrobiology}, keywords = {imported}, month = {Jan-23-2012}, pages = {9 - 18}, timestamp = {2015-06-25T21:16:21.000+0200}, title = {Olivine-Respiring Bacteria Isolated from the Rock-Ice Interface in a Lava-Tube Cave, a Mars Analog Environment}, url = {http://online.liebertpub.com/doi/abs/10.1089/ast.2011.0639}, volume = 12, year = 2012 }