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Microbiology: A microbial arsenic cycle in a salt-saturated, extreme environment

Science

By:
, , , , , , and
DOI: 10.1126/science.1110832

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Abstract

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.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Microbiology: A microbial arsenic cycle in a salt-saturated, extreme environment
Series title:
Science
DOI:
10.1126/science.1110832
Volume
308
Issue:
5726
Year Published:
2005
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science
First page:
1305
Last page:
1308
Number of Pages:
4