Abstract
Direct interspecies electrons transfer (DIET) is a syntrophic metabolism in which free electrons flow from one cell to another without being shuttled by reduced molecules such as molecular hydrogen or formate. As more and more microorganisms show a capacity for electron exchange, either to export or import them, it becomes obvious that DIET is a syntrophic metabolism that is much more present in nature than previously thought. This article reviews literature related to DIET, specifically in reference to anaerobic digestion. Anaerobic granular sludge, a biofilm, is a specialized microenvironment where syntrophic bacterial and archaeal organisms grow together in close proximity. Exoelectrogenic bacteria degrading organic substrates or intermediates need an electron sink and electrotrophic methanogens represent perfect partners to assimilate those electrons and produce methane. The granule extracellular polymeric substances by making the biofilm matrix more conductive, play a role as electrons carrier in DIET.
NRC paper No. 55668
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Dubé, CD., Guiot, S.R. (2015). Direct Interspecies Electron Transfer in Anaerobic Digestion: A Review. In: Guebitz, G., Bauer, A., Bochmann, G., Gronauer, A., Weiss, S. (eds) Biogas Science and Technology. Advances in Biochemical Engineering/Biotechnology, vol 151. Springer, Cham. https://doi.org/10.1007/978-3-319-21993-6_4
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