| Abstract: | A selenite-respiring bacterium, Bacillus selenitireducens, produced significant levels of Se(-II) (as aqueous HSe-) when supplied with Se(O). B. selenitireducens was also able to reduce selenite [Se(IV)] through Se(O) to Se(-II). Reduction of Se(O) by B.selenitireducens was more rapid in cells grown on colloidal sulfur [S(O)] or Se(IV) as their electron acceptor than for cell lines grown on fumarate. In contrast, three cultures of selenate-respiring bacteria, Sulfurospirillum barnesii, B. arsenicoselenatis, and Selenihalanaerobacter shriftii either were unable to reduce Se(O) to Se(-II) or had only a very limited capacity to achieve this reduction. Biological reduction of Se(O) to Se(-II) was observed during incubation of estuarine sediment slurries, while no such activity was noted in formalin-killed controls. The majority of the Se(-II) produced was found in the sediments as a solid precipitate of FeSe, rather than in solution as HSe-. These results demonstrate that certain anaerobic bacteria have the capacity to reduce Se(O) to Se(-II), providing a possible biological explanation for the occurrence of the selenide species in some sedimentary rocks. |
| Genre: | Article |
| ProdID: | 70024979 |
| Citation Author: | Herbel, M. J.; Blum, J. S.; Oremland, R. S.; Borglin, S. E. |
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| Citation End Page: | 602 |
| Citation Issue: | 6 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geomicrobiology Journal |
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| Citation Number Of Pages: | 16 |
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| Citation Search Results Text: | Reduction of elemental selenium to selenide: Experiments with anoxic sediments and bacteria that respire Se-oxyanions; 2003; Article; Journal; Geomicrobiology Journal; Herbel, M. J.; Blum, J. S.; Oremland, R. S.; Borglin, S. E. |
| Citation Start Page: | 587 |
| Citation Volume: | 20 |
| Citation Year: | 2003 |
| Type: | citation/reference |
| Text: | Reduction of elemental selenium to selenide: Experiments with anoxic sediments and bacteria that respire Se-oxyanions; 2003; Article; Journal; Geomicrobiology Journal; Herbel, M. J.; Blum, J. S.; Oremland, R. S.; Borglin, S. E. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 2003 00:00 -0600 |
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