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

Science
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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
Publisher AAAS
Contributing office(s) Toxic Substances Hydrology Program
Description 4 p.
First page 1305
Last page 1308