Microbiology: A microbial arsenic cycle in a salt-saturated, extreme environment
Science
By: R.S. Oremland, T.R. Kulp, J.S. Blum, S.E. Hoeft, S. Baesman, L.G. Miller, and J.F. Stolz
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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.
| 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 |
| Google Analytic Metrics | Metrics page |