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  • 1
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    Arsenic(III) fuels anoxygenic photosynthesis in hot spring biofilms from Mono Lake, California (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-08-16
    Description: Phylogenetic analysis indicates that microbial arsenic metabolism is ancient and probably extends back to the primordial Earth. In microbial biofilms growing on the rock surfaces of anoxic brine pools fed by hot springs containing arsenite and sulfide at high concentrations, we discovered light-dependent oxidation of arsenite [As(III)] to arsenate [As(V)] occurring under anoxic conditions. The communities were composed primarily of Ectothiorhodospira-like purple bacteria or Oscillatoria-like cyanobacteria. A pure culture of a photosynthetic bacterium grew as a photoautotroph when As(III) was used as the sole photosynthetic electron donor. The strain contained genes encoding a putative As(V) reductase but no detectable homologs of the As(III) oxidase genes of aerobic chemolithotrophs, suggesting a reverse functionality for the reductase. Production of As(V) by anoxygenic photosynthesis probably opened niches for primordial Earth's first As(V)-respiring prokaryotes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kulp, T R -- Hoeft, S E -- Asao, M -- Madigan, M T -- Hollibaugh, J T -- Fisher, J C -- Stolz, J F -- Culbertson, C W -- Miller, L G -- Oremland, R S -- New York, N.Y. -- Science. 2008 Aug 15;321(5891):967-70. doi: 10.1126/science.1160799.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉U.S. Geological Survey (USGS), Menlo Park, CA 94025, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18703741" target="_blank"〉PubMed〈/a〉
    Keywords: Anaerobiosis ; Arsenate Reductases/genetics/metabolism ; Arsenates/*metabolism ; Arsenites/*metabolism ; Autotrophic Processes ; Biofilms/*growth & development ; California ; Cyanobacteria/growth & development/isolation & purification/*metabolism ; Ectothiorhodospira/classification/growth & development/isolation & ; purification/*metabolism ; Hot Springs/*microbiology ; Light ; Molecular Sequence Data ; Oxidation-Reduction ; *Photosynthesis ; Sulfides/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    A microbial arsenic cycle in a salt-saturated, extreme environment (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-05-28
    Description: Searles Lake is a salt-saturated, alkaline brine unusually rich in the toxic element arsenic. Arsenic speciation changed from arsenate [As(V)] to arsenite [As(III)] with sediment depth. Incubated anoxic sediment slurries displayed dissimilatory As(V)-reductase activity that was markedly stimulated by H2 or sulfide, whereas aerobic slurries had rapid As(III)-oxidase activity. An anaerobic, extremely haloalkaliphilic bacterium was isolated from the sediment that grew via As(V) respiration, using either lactate or sulfide as its electron donor. Hence, a full biogeochemical cycle of arsenic occurs in Searles Lake, driven in part by inorganic electron donors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Oremland, Ronald S -- Kulp, Thomas R -- Blum, Jodi Switzer -- Hoeft, Shelley E -- Baesman, Shaun -- Miller, Laurence G -- Stolz, John F -- New York, N.Y. -- Science. 2005 May 27;308(5726):1305-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉U.S. Geological Survey, ms 480, 345 Middlefield Road, Menlo Park, CA 94025, USA. roremlan@usgs.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15919992" target="_blank"〉PubMed〈/a〉
    Keywords: Aerobiosis ; Anaerobiosis ; Arsenates/*metabolism ; Arsenites/*metabolism ; Bacteria, Anaerobic/classification/growth & development/*isolation & ; purification/*metabolism ; Bicarbonates/metabolism ; California ; Ecosystem ; Electron Transport ; Genes, rRNA ; Geologic Sediments/*microbiology ; Hydrogen-Ion Concentration ; Lactic Acid/metabolism ; Molecular Sequence Data ; Oxidation-Reduction ; Phylogeny ; *Salts ; Sodium Chloride ; Sulfides/metabolism ; Water/chemistry ; *Water Microbiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
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    PAPER CURRENT
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