期刊
GEOMICROBIOLOGY JOURNAL
卷 31, 期 10, 页码 917-928出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/01490451.2014.911994
关键词
Fe(III) reduction; electron shuttling; DGGE; humic acids
资金
- Arcadis Deutschland GmbH (office Freiberg, Saxony)
- Landesanstalt fur Altlastenfreistellung (Magdeburg, Saxony-Anhalt)
- Mitteldeutsche Sanierungs- und Entsorgungsgesellschaft (Bitterfeld, Saxony-Anhalt)
- German Research Foundation (DFG), research unit FOR 580
Humic substances can mediate electron transfer between microorganisms and Fe(III) minerals. Because it is unknown which microorganisms reduce humics in anoxic aquifers, we analyzed the diversity and physiological flexibility of Fe(III)-, humics-, and AQDS-reducers, which were present at up to 10(6)cells g(-1). No significant differences in 16S rRNA gene based diversity were found between enrichment cultures reducing ferrihydrite, humics or AQDS. Even after repeated transfers many of the enrichments retained the ability to switch to other electron acceptors. This suggests that humics- and Fe(III)-reducing microorganisms in anoxic aquifers are rather versatile and able to reduce different extracellular electron acceptors.
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