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A Bacterium That Can Grow by Using Arsenic Instead of Phosphorus
A bacterium is described, isolated from Mono Lake, California, that is able to substitute arsenic for phosphorus to sustain its growth and exchange of one of the major bio-elements may have profound evolutionary and geochemical importance. Expand
Speciation and weathering of selenium in upper cretaceous chalk and shale from South Dakota and Wyoming, USA
Abstract In geologic materials, petroleum, and the environment, selenium occurs in various oxidation states (VI, IV, 0, -II), mineralized forms, and organo-Se complexes. Each of these forms isExpand
Arsenic(III) Fuels Anoxygenic Photosynthesis in Hot Spring Biofilms from Mono Lake, California
Phylogenetic analysis indicates that microbial arsenic metabolism is ancient and probably extends back to the primordial Earth, and production of As(V) by anoxygenic photosynthesis probably opened niches forPrimordial Earth's first As( V)-respiring prokaryotes. Expand
A Microbial Arsenic Cycle in a Salt-Saturated, Extreme Environment
Searles Lake is a salt-saturated, alkaline brine unusually rich in the toxic element arsenic, and a full biogeochemical cycle of arsenic occurs in Searles Lake, driven in part by inorganic electron donors. Expand
Effects of Imposed Salinity Gradients on Dissimilatory Arsenate Reduction, Sulfate Reduction, and Other Microbial Processes in Sediments from Two California Soda Lakes
The results suggest that organisms adapted to more dilute conditions can remain viable at high salinity and rapidly repopulate the lake during periods of rising lake level. Expand
Dissimilatory Arsenate and Sulfate Reduction in Sediments of Two Hypersaline, Arsenic-Rich Soda Lakes: Mono and Searles Lakes, California
A radioisotope method was devised to study bacterial respiratory reduction of arsenate in sediments, and more arrA gene signal was observed in Mono Lake and was detectable at a greater depth, despite the higher arsenate reduction activity observed in Searles Lake. Expand
Enrichment and isolation of Bacillus beveridgei sp. nov., a facultative anaerobic haloalkaliphile from Mono Lake, California, that respires oxyanions of tellurium, selenium, and arsenic
An enrichment culture was established from Mono Lake sediment slurries that demonstrated Te(IV)-dependent growth and the epithet Bacillus beveridgei strain MLTeJBT is proposed. Expand
Dissimilatory Arsenate Reduction with Sulfide as Electron Donor: Experiments with Mono Lake Water and Isolation of Strain MLMS-1, a Chemoautotrophic Arsenate Respirer
Anoxic bottom water from Mono Lake, California, can biologically reduce added arsenate without any addition of electron donors, and strain MLMS-1 is a gram-negative, motile curved rod that grows by oxidizing sulfide to sulfate while reducing arsenate to arsenite. Expand
Microbiological Oxidation of Antimony(III) with Oxygen or Nitrate by Bacteria Isolated from Contaminated Mine Sediments
The results suggest that expression of aioA is not induced by Sb(III) but may be involved in Sb (III) oxidation along with an SB(III)-specific pathway. Expand
Desulfohalophilus alkaliarsenatis gen. nov., sp. nov., an extremely halophilic sulfate- and arsenate-respiring bacterium from Searles Lake, California
It is concluded that strain SLSR-1 can only achieve growth via arsenate-reduction under the current chemical conditions prevalent at Searles Lake. Expand