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Microbial fuel cell metagenome

ABSTRACT: electrode biofilms of MFCs with Fe2+

PROVIDER: PRJNA374927 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR5266191_1.fastq.gz	Fastqsanger.gz
	SRR5266191_2.fastq.gz	Fastqsanger.gz
	SRR5266192_1.fastq.gz	Fastqsanger.gz
	SRR5266192_2.fastq.gz	Fastqsanger.gz
	SRR5266193_1.fastq.gz	Fastqsanger.gz

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Project description:<p>Understanding the extracellular electron transfer mechanisms of electroactive bacteria could help determine their potential in microbial fuel cells (MFCs) and their microbial syntrophy with redox-active minerals in natural environments. However, the mechanisms of extracellular electron transfer to electrodes by sulfate-reducing bacteria (SRB) remain underexplored. Here, we utilized double-chamber MFCs with carbon cloth electrodes to investigate the extracellular electron transfer mechanisms of Desulfovibrio vulgaris Hildenborough (DvH), a model SRB, under varying lactate and sulfate concentrations using different DvH mutants. Our MFC setup indicated that DvH can harvest electrons from lactate at the anode and transfer them to cathode, where DvH could further utilize these electrons. Patterns in current production compared to variations of electron donor/acceptor ratios in the anode and cathode suggested that attachment of DvH to the electrode and biofilm density were critical for effective electricity generation. Electron microscopy analysis of DvH biofilms indicated DvH utilized filaments that resemble pili to attach on electrodes and facilitate extracellular electron transfer from cell-to-cell and to the electrode. Proteomics profiling indicated that DvH adapted to electroactive respiration by presenting more pili- and flagellar- related proteins. The mutant with a deletion of the major pilus-producing gene yielded less voltage and far less attachment to both anodic and cathodic electrodes, suggesting the importance of pili in extracellular electron transfer. The mutant with a deficiency in biofilm formation, however, did not eliminate current production indicating the existence of indirect extracellular electron transfer. Untargeted metabolomics profiling showed flavin-based metabolites, potential electron shuttles.</p>

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Expression Analysis of Geobacter sulfurreducens Current-Consuming Biofilm versus Current-Producing Biofilm

Project description:There is a wide diversity of potential applications for direct electron transfer from electrodes to microorganisms, which might be better optimized if the mechanisms for this novel electrode-biofilm interaction were better understood. Geobacter sulfurreducens is one of the few microorganisms available in pure culture that is known to be capable of directly accepting electrons from a negatively poised electrode. A microarray comparison of cells accepting electrons from the electrode versus cells donating electrons to the electrode reveals that the genes previously observed to be upregulated in current-producing biofilms are not highly expressed in current-consuming biofilms.

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