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

Type Article
Date 2018-07
Language English
Author(s) Pillot Guillaume1, Frouin Eleonore1, Pasero Emilie1, Godfroy AnneORCID2, Combet-Blanc Yannick1, Davidson Sylvain1, Liebgott Pierre-Pol1
Affiliation(s) 1 : Univ Toulon & Var, Aix Marseille Univ, CNRS, IRD,MIO UM 110, Marseille, France.
2 : Univ Bretagne Occidentale, CNRS, IFREMER,UM6197, Ctr Brest CS10070,Lab Microbiol Environm Extremes, Plouzane, France.
Source Bioresource Technology (0960-8524) (Elsevier Sci Ltd), 2018-07 , Vol. 259 , P. 304-311
DOI 10.1016/j.biortech.2018.03.053
WOS© Times Cited 7
Keyword(s) Hyperthermophilic exoelectrogens, Deep-sea hydrothermal vent, Microbial electrolysis cell, External electron transfer
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.

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Pillot Guillaume, Frouin Eleonore, Pasero Emilie, Godfroy Anne, Combet-Blanc Yannick, Davidson Sylvain, Liebgott Pierre-Pol (2018). Specific enrichment of hyperthermophilic electroactive Archaea from deep-sea hydrothermal vent on electrically conductive support. Bioresource Technology, 259, 304-311. Publisher's official version : https://doi.org/10.1016/j.biortech.2018.03.053 , Open Access version : https://archimer.ifremer.fr/doc/00431/54228/