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Evidence of competition between electrogens shaping electroactive microbial communities in microbial electrolysis cells

In single-chamber microbial electrolysis cells (MECs), organic compounds are oxidized at the anode, liberating electrons that are used for hydrogen evolution at the cathode. Microbial communities on the anode and cathode surfaces and in the bulk liquid determine the function of the MEC. The communit...

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Autores principales: Abadikhah, Marie, Rodriguez, Miguel de Celis, Persson, Frank, Wilén, Britt-Marie, Farewell, Anne, Modin, Oskar
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9800620/
https://www.ncbi.nlm.nih.gov/pubmed/36590422
http://dx.doi.org/10.3389/fmicb.2022.959211
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author Abadikhah, Marie
Rodriguez, Miguel de Celis
Persson, Frank
Wilén, Britt-Marie
Farewell, Anne
Modin, Oskar
author_facet Abadikhah, Marie
Rodriguez, Miguel de Celis
Persson, Frank
Wilén, Britt-Marie
Farewell, Anne
Modin, Oskar
author_sort Abadikhah, Marie
collection PubMed
description In single-chamber microbial electrolysis cells (MECs), organic compounds are oxidized at the anode, liberating electrons that are used for hydrogen evolution at the cathode. Microbial communities on the anode and cathode surfaces and in the bulk liquid determine the function of the MEC. The communities are complex, and their assembly processes are poorly understood. We investigated MEC performance and community composition in nine MECs with a carbon cloth anode and a cathode of carbon nanoparticles, titanium, or stainless steel. Differences in lag time during the startup of replicate MECs suggested that the initial colonization by electrogenic bacteria was stochastic. A network analysis revealed negative correlations between different putatively electrogenic Deltaproteobacteria on the anode. Proximity to the conductive anode surface is important for electrogens, so the competition for space could explain the observed negative correlations. The cathode communities were dominated by hydrogen-utilizing taxa such as Methanobacterium and had a much lower proportion of negative correlations than the anodes. This could be explained by the diffusion of hydrogen throughout the cathode biofilms, reducing the need to compete for space.
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spelling pubmed-98006202022-12-31 Evidence of competition between electrogens shaping electroactive microbial communities in microbial electrolysis cells Abadikhah, Marie Rodriguez, Miguel de Celis Persson, Frank Wilén, Britt-Marie Farewell, Anne Modin, Oskar Front Microbiol Microbiology In single-chamber microbial electrolysis cells (MECs), organic compounds are oxidized at the anode, liberating electrons that are used for hydrogen evolution at the cathode. Microbial communities on the anode and cathode surfaces and in the bulk liquid determine the function of the MEC. The communities are complex, and their assembly processes are poorly understood. We investigated MEC performance and community composition in nine MECs with a carbon cloth anode and a cathode of carbon nanoparticles, titanium, or stainless steel. Differences in lag time during the startup of replicate MECs suggested that the initial colonization by electrogenic bacteria was stochastic. A network analysis revealed negative correlations between different putatively electrogenic Deltaproteobacteria on the anode. Proximity to the conductive anode surface is important for electrogens, so the competition for space could explain the observed negative correlations. The cathode communities were dominated by hydrogen-utilizing taxa such as Methanobacterium and had a much lower proportion of negative correlations than the anodes. This could be explained by the diffusion of hydrogen throughout the cathode biofilms, reducing the need to compete for space. Frontiers Media S.A. 2022-12-16 /pmc/articles/PMC9800620/ /pubmed/36590422 http://dx.doi.org/10.3389/fmicb.2022.959211 Text en Copyright © 2022 Abadikhah, Rodriguez, Persson, Wilén, Farewell and Modin. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Microbiology
Abadikhah, Marie
Rodriguez, Miguel de Celis
Persson, Frank
Wilén, Britt-Marie
Farewell, Anne
Modin, Oskar
Evidence of competition between electrogens shaping electroactive microbial communities in microbial electrolysis cells
title Evidence of competition between electrogens shaping electroactive microbial communities in microbial electrolysis cells
title_full Evidence of competition between electrogens shaping electroactive microbial communities in microbial electrolysis cells
title_fullStr Evidence of competition between electrogens shaping electroactive microbial communities in microbial electrolysis cells
title_full_unstemmed Evidence of competition between electrogens shaping electroactive microbial communities in microbial electrolysis cells
title_short Evidence of competition between electrogens shaping electroactive microbial communities in microbial electrolysis cells
title_sort evidence of competition between electrogens shaping electroactive microbial communities in microbial electrolysis cells
topic Microbiology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9800620/
https://www.ncbi.nlm.nih.gov/pubmed/36590422
http://dx.doi.org/10.3389/fmicb.2022.959211
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