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• W2899162364 abstract "Abstract Direct electron uptake by prokaryotes is a recently described mechanism with a potential application for energy and CO 2 storage into value added chemicals. Members of Methanosarcinales, an environmentally and biotechnologically relevant group of methanogens, were previously shown to retrieve electrons from an extracellular electrogenic partner performing Direct Interspecies Electron Transfer (DIET) and were therefore proposed to be electroactive. However, their intrinsic electroactivity has never been examined. In this study, we tested two methanogens belonging to the genus Methanosarcina, M. barkeri and M. horonobensis, regarding their ability to accept electrons directly from insoluble electron donors like other cells, conductive particles and electrodes. Both methanogens were able to retrieve electrons from Geobacter metallireducens via DIET. Furthermore, DIET was also stimulated upon addition of electrically conductive granular activated carbon (GAC) when each was co-cultured with G. metallireducens . However, when provided with a cathode poised at −400 mV (vs. SHE), only M. barkeri could perform electromethanogenesis. In contrast, the strict hydrogenotrophic methanogen, Methanobacterium formicicum , did not produce methane regardless of the type of insoluble electron donor provided ( Geobacter cells, GAC or electrodes). A comparison of functional gene categories between the two Methanosarcina showed differences regarding energy metabolism, which could explain dissimilarities concerning electromethanogenesis at fixed potentials. We suggest that these dissimilarities are minimized in the presence of an electrogenic DIET partner (e.g. Geobacter ), which can modulate its surface redox potentials by adjusting the expression of electroactive surface proteins." @default.
• W2899162364 created "2018-11-09" @default.
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• W2899162364 date "2018-10-31" @default.
• W2899162364 modified "2023-10-12" @default.
• W2899162364 title "Extracellular Electron Uptake by TwoMethanosarcinaSpecies" @default.
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• W2899162364 doi "https://doi.org/10.1101/458091" @default.
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