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Specific enrichment of hyperthermophilic electroactive Archaea from deep-sea hydrothermal vent on electrically conductive support.

By Guillaume Pillot, Eleonore Frouin, Emilie Pasero, Anne Godfroy, Yannick Combet-blanc, Sylvain Davidson and Pierre-pol Liebgott

Abstract

While more and more investigations are done to study hyperthermophilic exoelectrogenic communities from environments, none have been performed yet on deep-sea hydrothermal vent. Samples of black smoker chimney from Rainbow site on the Atlantic mid-oceanic ridge have been harvested for enriching exoelectrogens in microbial electrolysis cells under hyperthermophilic (80 °C) condition. Two enrichments were performed in a BioElectrochemical System specially designed: one from direct inoculation of crushed chimney and the other one from inoculation of a pre-cultivation on iron (III) oxide. In both experiments, a current production was observed from 2.4 A/m2 to 5.8 A/m2 with a set anode potential of -0.110 V vs Ag/AgCl. Taxonomic affiliation of the exoelectrogen communities obtained on the electrode exhibited a specific enrichment of Archaea belonging to Thermococcales and Archeoglobales orders, even when both inocula were dominated by Bacteria

Topics: Hyperthermophilic exoelectrogens, Deep-sea hydrothermal vent, Microbial electrolysis cell, External electron transfer
Publisher: 'Elsevier BV'
Year: 2018
DOI identifier: 10.1016/j.biortech.2018.03.053
OAI identifier: oai:archimer.ifremer.fr:54228
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