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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...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Frontiers Media S.A.
2022
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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. |
format | Online Article Text |
id | pubmed-9800620 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Frontiers Media S.A. |
record_format | MEDLINE/PubMed |
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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