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Electroactive bacteria associated with stainless steel ennoblement in seawater
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. Universite Brest, France. (Institut de la Corrosion)
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. (Institut de la Corrosion)
Josephine Bay Paul Center for Comparative Molecular Biology and Evolution, US.
Universite Brest, France.
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2019 (English)In: Frontiers in Microbiology, ISSN 1664-302X, E-ISSN 1664-302X, Vol. 10, no FEB, article id 00170Article in journal (Refereed) Published
Abstract [en]

Microorganisms can increase the open-circuit potential of stainless steel immersed in seawater of several hundred millivolts in a phenomenon called ennoblement. It raises the chance of corrosion as the open-circuit potential may go over the pitting corrosion potential. Despite the large impact of the ennoblement, no unifying mechanisms have been described as responsible for the phenomenon. Here we show that the strict electrotroph bacterium "Candidatus Tenderia electrophaga" is detected as an ennoblement biomarker and is only present at temperatures at which we observe ennoblement. This bacterium was previously enriched in biocathode systems. Our results suggest that "Candidatus Tenderia electrophaga," and its previously described extracellular electron transfer metabolism coupled to oxygen reduction activity, could play a central role in modulating stainless steel open-circuit potential and consequently mediating ennoblement.

Place, publisher, year, edition, pages
Frontiers Media S.A. , 2019. Vol. 10, no FEB, article id 00170
Keywords [en]
16S rRNA gene, Electroactive bacteria, Ennoblement, Microbial ecology, Stainless steel, biological marker, sea water, Article, binding site, bioinformatics, Candidatus Tenderia electrophaga, corrosion, DNA extraction, DNA sequence, electric potential, microbial community, microbial interaction, nonhuman, oxidation, Phytoplasma, polarization, polarization and depolarization, proton motive force, scanning electron microscopy, temperature
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-40478DOI: 10.3389/fmicb.2019.00170Scopus ID: 2-s2.0-85065892827OAI: oai:DiVA.org:ri-40478DiVA, id: diva2:1359913
Note

 Funding details: Association Nationale de la Recherche et de la Technologie, N. 2015/0061; Funding text 1: The authors acknowledge the ANRT agency for its financial support with the CIFRE Ph.D. grant N. 2015/0061

Available from: 2019-10-10 Created: 2019-10-10 Last updated: 2019-10-14Bibliographically approved

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