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Extracellular electron transfer is the main way for microorganisms to carry out extracellular metabolism.
Through this process, many microorganisms participate in the geochemical cycle of elements and achieve high-efficiency degradation of pollutants (such as bioelectrochemical systems BESs)
.
There are very complex metabolic interactions (such as competition, symbiosis, coexistence, etc.
) between microorganisms in mixed microbial communities.
These metabolic interactions will affect the extracellular electron transfer process of microorganisms, which in turn affects the efficiency of BESs in degrading pollutants
.
In the past, related research mainly focused on metabolic cooperation, but the influence mechanism of interspecies competition on the process of microbial extracellular electron transfer has not been studied yet
.
Recently, the Environmental Electrochemistry Research Group of the Institute of Urban Environment, Chinese Academy of Sciences used BESs as a research platform to use two strains of Shewanella oneidensis (Shewanella oneidensis MR-1) and Freund's citric acid both using lactate as a substrate.
Bacillus (Citrobacter freundii An1) explored the influence of inter-species substrate competition on extracellular electron transport
.
Studies have shown that the substrate competition between S.
oneidensis MR-1 and C.
freundii An1 increases the power generation of mixed bacteria BESs, which is 6 times that of BESs inoculated with S.
oneidensis MR-1 alone
.
The results showed that the inter-species substrate competition increased the metabolic activity of S.
oneidensis MR-1 and the ability to form a biofilm on the electrode, thereby obtaining a competitive advantage with C.
freundii An1; the increase in metabolic activity was not only for MR-1 Provides more electrons, but also secretes more flavin to promote extracellular electron transfer
.
Proteomics analysis further confirmed that, affected by the substrate competition between species, the expression of proteins related to lactate metabolism, biofilm formation, and outer membrane c-type cytochromes in S.
oneidensis MR-1 in the electrode biofilm was significantly up-regulated
.
The research results were published on Biosensors and Bioelectronics under the title of Interspecific competition by non-exoelectrogenic Citrobacter freundii An1 boosts bioelectricity generation of exoelectrogenic Shewanella oneidensis MR-1
.
This research was supported by the National Natural Science Foundation of China, the Xiamen Youth Innovation Fund Project, and the Chinese Academy of Sciences Youth Innovation Promotion Association
.
Interspecific competition affects microbial extracellular electron transfer.
Source: Institute of Urban Environment, Chinese Academy of Sciences
Through this process, many microorganisms participate in the geochemical cycle of elements and achieve high-efficiency degradation of pollutants (such as bioelectrochemical systems BESs)
.
There are very complex metabolic interactions (such as competition, symbiosis, coexistence, etc.
) between microorganisms in mixed microbial communities.
These metabolic interactions will affect the extracellular electron transfer process of microorganisms, which in turn affects the efficiency of BESs in degrading pollutants
.
In the past, related research mainly focused on metabolic cooperation, but the influence mechanism of interspecies competition on the process of microbial extracellular electron transfer has not been studied yet
.
Recently, the Environmental Electrochemistry Research Group of the Institute of Urban Environment, Chinese Academy of Sciences used BESs as a research platform to use two strains of Shewanella oneidensis (Shewanella oneidensis MR-1) and Freund's citric acid both using lactate as a substrate.
Bacillus (Citrobacter freundii An1) explored the influence of inter-species substrate competition on extracellular electron transport
.
Studies have shown that the substrate competition between S.
oneidensis MR-1 and C.
freundii An1 increases the power generation of mixed bacteria BESs, which is 6 times that of BESs inoculated with S.
oneidensis MR-1 alone
.
The results showed that the inter-species substrate competition increased the metabolic activity of S.
oneidensis MR-1 and the ability to form a biofilm on the electrode, thereby obtaining a competitive advantage with C.
freundii An1; the increase in metabolic activity was not only for MR-1 Provides more electrons, but also secretes more flavin to promote extracellular electron transfer
.
Proteomics analysis further confirmed that, affected by the substrate competition between species, the expression of proteins related to lactate metabolism, biofilm formation, and outer membrane c-type cytochromes in S.
oneidensis MR-1 in the electrode biofilm was significantly up-regulated
.
The research results were published on Biosensors and Bioelectronics under the title of Interspecific competition by non-exoelectrogenic Citrobacter freundii An1 boosts bioelectricity generation of exoelectrogenic Shewanella oneidensis MR-1
.
This research was supported by the National Natural Science Foundation of China, the Xiamen Youth Innovation Fund Project, and the Chinese Academy of Sciences Youth Innovation Promotion Association
.
Interspecific competition affects microbial extracellular electron transfer.
Source: Institute of Urban Environment, Chinese Academy of Sciences
