Electrochemically Active Microorganisms
Microbial electrochemical systems (MESs, also known as bioelectrochemical systems (BESs) are promising technologies for energy and products recovery coupled with wastewater treatment, and have attracted increasing attention. Many studies have been conducted to expand the application of MESs for cont...
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| اللغة: | الإنجليزية |
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Frontiers Media SA
2021
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| الوصول للمادة أونلاين: | 32048 |
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| _version_ | 1869521067087757312 |
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| author | Haoyi Cheng Yong Xiao Feng Zhao |
| author_browse | Feng Zhao Haoyi Cheng Yong Xiao |
| author_facet | Haoyi Cheng Yong Xiao Feng Zhao |
| author_sort | Haoyi Cheng |
| collection | Directory of Open Access Books |
| description | Microbial electrochemical systems (MESs, also known as bioelectrochemical systems (BESs) are promising technologies for energy and products recovery coupled with wastewater treatment, and have attracted increasing attention. Many studies have been conducted to expand the application of MESs for contaminants degradation and bioremediation, and increase the efficiency of electricity production by optimizing architectural structure of MESs, developing new electrode materials, etc. However, one of the big challenges for researchers to overcome, before MESs can be used commercially, is to improve the performance of the biofilm on electrodes so that ‘electron transfer’ can be enhanced. This would lead to greater production of electricity, energy or other products. Electrochemically active microorganisms (EAMs) are a group of microorganisms which are able to release electrons from inside their cells to an electrode or accept electrons from an electron donor. The way in which EAMs do this is called ‘extracellular electron transfer’ (EET). So far, two EET mechanisms have been identified: direct electron transfer from microorganisms physically attached to an electrode, and indirect electron transfer from microorganisms that are not physically attached to an electrode. 1) Direct electron transfer between microorganisms and electrode can occur in two ways: a) when there is physical contact between outer membrane structures of the microbial cell and the surface of the electrode, b) when electrons are transferred between the microorganism and the electrode through tiny projections (called pili or nanowires) that extend from the outer membrane of the microorganism and attach themselves to the electrode. 2) Indirect transfer of electrons from the microorganisms to an electrode occurs via long-range electron shuttle compounds that may be naturally present (in wastewater, for example), or may be produced by the microorganisms themselves. The electrochemically active biofilm, which degrades contaminants and produces electricity in MESs, consists of diverse community of EAMs and other microorganisms. However, up to date only a few EAMs have been identified, and most studies on EET have focused on the two model species of Shewanella oneidensis and Geobacter sulfurreducens. |
| format | Online |
| id | doab-20.500.12854ir-46136 |
| institution | Directory of Open Access Books |
| language | eng |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | Frontiers Media SA |
| publisherStr | Frontiers Media SA |
| record_format | ojs |
| spelling | doab-20.500.12854ir-461362024-04-05T17:31:01Z Electrochemically Active Microorganisms Haoyi Cheng Yong Xiao Feng Zhao QR1-502 Q1-390 extracellular electron transfer bioelectrochemical systems (BESs) Microbial electrochemical systems (MESs) Electrochemically active microorganisms (EAMs) thema EDItEUR::P Mathematics and Science::PS Biology, life sciences::PSG Microbiology (non-medical) Microbial electrochemical systems (MESs, also known as bioelectrochemical systems (BESs) are promising technologies for energy and products recovery coupled with wastewater treatment, and have attracted increasing attention. Many studies have been conducted to expand the application of MESs for contaminants degradation and bioremediation, and increase the efficiency of electricity production by optimizing architectural structure of MESs, developing new electrode materials, etc. However, one of the big challenges for researchers to overcome, before MESs can be used commercially, is to improve the performance of the biofilm on electrodes so that ‘electron transfer’ can be enhanced. This would lead to greater production of electricity, energy or other products. Electrochemically active microorganisms (EAMs) are a group of microorganisms which are able to release electrons from inside their cells to an electrode or accept electrons from an electron donor. The way in which EAMs do this is called ‘extracellular electron transfer’ (EET). So far, two EET mechanisms have been identified: direct electron transfer from microorganisms physically attached to an electrode, and indirect electron transfer from microorganisms that are not physically attached to an electrode. 1) Direct electron transfer between microorganisms and electrode can occur in two ways: a) when there is physical contact between outer membrane structures of the microbial cell and the surface of the electrode, b) when electrons are transferred between the microorganism and the electrode through tiny projections (called pili or nanowires) that extend from the outer membrane of the microorganism and attach themselves to the electrode. 2) Indirect transfer of electrons from the microorganisms to an electrode occurs via long-range electron shuttle compounds that may be naturally present (in wastewater, for example), or may be produced by the microorganisms themselves. The electrochemically active biofilm, which degrades contaminants and produces electricity in MESs, consists of diverse community of EAMs and other microorganisms. However, up to date only a few EAMs have been identified, and most studies on EET have focused on the two model species of Shewanella oneidensis and Geobacter sulfurreducens. 2021-02-11T12:19:59Z 2021-02-11T12:19:59Z 2019-01-23 14:53:43 2018 book 32048 16648714 9782889456512 https://directory.doabooks.org/handle/20.500.12854/46136 eng Frontiers Research Topics image/jpeg Attribution 4.0 International https://www.frontiersin.org/research-topics/3845/electrochemically-active-microorganisms Frontiers Media SA 10.3389/978-2-88945-651-2 10.3389/978-2-88945-651-2 bf5ce210-e72e-4860-ba9b-c305640ff3ae 9782889456512 218 open access |
| spellingShingle | QR1-502 Q1-390 extracellular electron transfer bioelectrochemical systems (BESs) Microbial electrochemical systems (MESs) Electrochemically active microorganisms (EAMs) thema EDItEUR::P Mathematics and Science::PS Biology, life sciences::PSG Microbiology (non-medical) Haoyi Cheng Yong Xiao Feng Zhao Electrochemically Active Microorganisms |
| title | Electrochemically Active Microorganisms |
| title_full | Electrochemically Active Microorganisms |
| title_fullStr | Electrochemically Active Microorganisms |
| title_full_unstemmed | Electrochemically Active Microorganisms |
| title_short | Electrochemically Active Microorganisms |
| title_sort | electrochemically active microorganisms |
| topic | QR1-502 Q1-390 extracellular electron transfer bioelectrochemical systems (BESs) Microbial electrochemical systems (MESs) Electrochemically active microorganisms (EAMs) thema EDItEUR::P Mathematics and Science::PS Biology, life sciences::PSG Microbiology (non-medical) |
| topic_facet | QR1-502 Q1-390 extracellular electron transfer bioelectrochemical systems (BESs) Microbial electrochemical systems (MESs) Electrochemically active microorganisms (EAMs) thema EDItEUR::P Mathematics and Science::PS Biology, life sciences::PSG Microbiology (non-medical) |
| url | 32048 |
| work_keys_str_mv | AT haoyicheng electrochemicallyactivemicroorganisms AT yongxiao electrochemicallyactivemicroorganisms AT fengzhao electrochemicallyactivemicroorganisms |