Syntrophic oxidation of butyrate is catabolized by a few bacteria specialists in the presence of methanogens. In the present study, a highly enriched butyrate-oxidizing consortium was obtained from a wetland sediment in Tibetan Plateau. During continuous transfers of the enrichment, the addition of magnetite nanoparticles (nanoFeO) consistently enhanced butyrate oxidation and CH production. Molecular analysis revealed that all bacterial sequences from the consortium belonged to with the closest relative of and 96% of the archaeal sequences were related to with the remaining sequences to . Addition of graphite and carbon nanotubes for a replacement of nanoFeO caused the similar stimulatory effect. Silica coating of nanoFeO surface, however, completely eliminated the stimulatory effect. The control experiment with axenic cultivation of a strain and two methanogen strains showed no effect by nanoFeO. Together, the results in the present study support that syntrophic oxidation of butyrate is likely facilitated by direct interspecies electron transfer in the presence of conductive nanomaterials.
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| http://dx.doi.org/10.3389/fmicb.2018.01480 | DOI Listing |
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