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

被引:125
作者
Oremland, RS
Kulp, TR
Blum, JS
Hoeft, SE
Baesman, S
Miller, LG
Stolz, JF
机构
[1] US Geol Survey, Menlo Pk, CA 94025 USA
[2] Duquesne Univ, Dept Biol Sci, Pittsburgh, PA 15282 USA
关键词
D O I
10.1126/science.1110832
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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 H-2 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.
引用
收藏
页码:1305 / 1308
页数:4
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