지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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초록· 키워드
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To better understand dissimilatory iron and sulfate reduction (DIR and DSR) by subsurface microorganisms, we investigated the effects of sulfate and electron donors on the microbial goethite (${\alpha}$-FeOOH) reduction. Batch systems were created 1) with acetate or glucose (donor), 2) with goethite and sulfate (acceptor), and 3) with aquifer sediment (microbial source). With 0.2 mM sulfate, goethite reduction coupled with acetate oxidation was limited. However, with 10 mM sulfate, 8 mM goethite reduction occurred with complete sulfate reduction and x-ray absorption fine-structure analysis indicated the formation of iron sulfide. This suggests that goethite reduction was due to the sulfide species produced by DSR bacteria rather than direct microbial reaction by DIR bacteria. Both acetate and glucose promoted goethite reduction. The rate of goethite reduction was faster with glucose, while the extent of goethite reduction was higher with acetate. Sulfate reduction (10 mM) occurred only with acetate. The results suggest that glucose-fermenting bacteria rapidly stimulated goethite reduction, but acetate-oxidizing DSR bacteria reduced goethite indirectly by producing sulfides. This study suggests that the availability of specific electron donor and sulfate significantly influence microbial community activities as well as goethite transformation, which should be considered for the bioremediation of contaminated environments.
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참고문헌 (31)
참고문헌 신청
Anderson, R. T / 2003 / Stimulating the in situ activity of geobacter species to remove uranium from the groundwater of a uranium-contaminated aquifer / Appl. Environ. Microbiol 69:5884~5891
Barton, L / 2007 / Sulphate-reducing bacteria environmental and engineered systems / Cambridge University Press
Bethke, C.M / 2011 / The thermodynamic ladder in geomicrobiology / Am. J. Sci 311:183~210
Borch, T / 2007 / Phosphate imposed limitations on biological reduction and alteration of ferrihydrite / Environ. Sci. Technol 41:166~172
Burkhardt, E. -M / 2011 / Heavy metal tolerance of Fe(III)-reducing microbial communities in contaminated creek bank soils / Appl. Environ. Microbiol 77:3132~3136
Barton, L / 2007 / Sulphate-reducing bacteria environmental and engineered systems / Cambridge University Press
Bethke, C.M / 2011 / The thermodynamic ladder in geomicrobiology / Am. J. Sci 311:183~210
Borch, T / 2007 / Phosphate imposed limitations on biological reduction and alteration of ferrihydrite / Environ. Sci. Technol 41:166~172
Burkhardt, E. -M / 2011 / Heavy metal tolerance of Fe(III)-reducing microbial communities in contaminated creek bank soils / Appl. Environ. Microbiol 77:3132~3136
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