electricity production byGeobacteraceaea

electricity production byGeobacteraceaea

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  Compiler:Yashgin Hassanzadeh
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  Introduction   Global energy concern for future uses guide Scientist to keep searching for new and renewable source of energy which Could be used as not only as Option but also as main Source of energy. So let’s find the amazing one in the rest!
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  Introduction  Ability of microorganisms to oxidize organic compound to carbon dioxide with an electron serving shows promise for the conversion of complex substrate to electricity or biofuels in BESs Microbial fuel cells (MFCs) are devices that exploit microorganisms as “biocatalysts” of generating electric power from organic matter Analysis of the microbial community firmly attached to anodes harvesting electricity from a variety of sediments demonstrated that microorganisms in the family Geobacteraceae were highly enriched on anodes
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  Geobacteraceae  Kingdom: Bacteria Phylum: Proteobacteria Class: Deltaproteobacteria Order: Desulfuromonadales Family: Geobacteraceae Genus: Geobacter Rod-shaped with flagella, Gram-negative, some are motile but others are nonmotile , anaerobic bacteria that are useful in bioremediation, oxidize organic compound and metals (iron-radioactive metals-petroleum)
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  Mechanism for electron transfer  Direct contact between redox-active protein on the outer surfaces of the cells and the electron acceptor Electron transfer via soluble electrons shuttling molecules The conduction of electrons along pili or other filamentous structures
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  FIG1.example of microbialfuel cells producing electricity through different mechanisms of electron transfer to the anode.
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  Microbial electron production  Geobactteraceae (G.metallireducens, G.sulfureducens)
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  FIG3.generalized pathway forthe anaerobic oxidation of FIG2.simplified model for the conversion of complex organic fuels to electricity. organic matter to carbon dioxide. The process is mediated by a consortium of fermentative microorganisms and gobacter species.
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  FIG4.Model for Geobactersulfurreducens electron transfer to the anode of microbial fuel cell from NADH derived from organic matter oxidation.
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  FIG5.Proposed mechanisms forelectron transfer to the anode of microbial fuel cells.
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  FIG6.A mechanism forextracellular electron transfer by Geobacter sulfurreducens.
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  FIG8.Transmission electron micrographof negatively stained FIG7.Transmission electron micrographs of negatively stained G.sulfurreducens grown in medium with Fe(III) as electron acceptor. G.sulfurreducens cells grown in medium with fumarate as electron acceptor.
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  Applications   Power generation  Education  Biosensor  Powering underwater monitoring devices
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  References   Lovley , D. R.(2008).The microbe electric: conversion of organic matter to electricity. Elsevier Ltd 19:1-8.  Lovley , D. R.(2006).Bug juice: harvesting electricity with microorganisms. Nature Reviews 4:497-508.