electricity production byGeobacteraceaea
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This document discusses microbial fuel cells and the potential for microorganisms like Geobacteraceae bacteria to generate electricity from organic matter. Geobacteraceae bacteria are able to transfer electrons extracellularly to an anode in microbial fuel cells through direct contact, soluble electron shuttles, or along protein-rich structures like pili. This allows microbial fuel cells to harness bacteria like Geobacter sulfurreducens to convert complex organic fuels into electricity through oxidation of organic compounds and transfer of electrons to the anode. Microbial fuel cells show promise for power generation, education, biosensing, and powering underwater devices.
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This document discusses microbial fuel cells (MFCs) powered by the bacteria Geobacter sulfurreducens. G. sulfurreducens is able to generate electricity through metabolizing substrates and transferring electrons to an anode. It is able to transfer electrons through protein structures called c-type cytochromes and filaments called pili. The formation of biofilms by G. sulfurreducens on the anode allows the cells to transfer electrons more efficiently through direct contact and intercellular protein interactions. Research aims to engineer strains of G. sulfurreducens that can generate higher currents through increased expression of proteins involved in electron transfer pathways and biofilm formation.
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Microbial fuel cells (MFCs) use bacteria to convert chemical energy from bio-convertible substrates like glucose or acetate directly into electricity. A typical MFC consists of an anode compartment where microbes oxidize fuel and generate electrons and protons, and a cathode compartment exposed to air. A cation-specific membrane allows proton passage between compartments. MFCs offer unlimited fuel sources without pollution and can achieve higher energy conversion than other methods, with no moving parts or noise. Examples demonstrate various microbes generating voltages between 250-650mV using different substrates and mediators or mediator-less systems. Significant factors that affect MFC operation include electrode type and area, use of catalysts, substrate concentration, and types of micro
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Microbial fuel cells generate electricity through the metabolism of microbes. The microbes oxidize organic matter at the anode, releasing electrons and protons. Electrons flow through an external circuit to the cathode, producing an electrical current. Protons flow through a membrane to the cathode. At the cathode, oxygen or another electron acceptor reacts with the electrons and protons to form water. This document discusses the operating mechanisms and conditions that affect power generation in microbial fuel cells, such as microbe type, substrate concentration, ionic strength, membrane type, pH, temperature, and reactor configuration. It also describes an experiment using effluent water from a pharmaceutical industry to power a microbial fuel cell without additional substrate or membrane.
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It is a good and most usefull for the all the engg students
It is a good and most usefull for the all the engg students
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electricity production byGeobacteraceaea
- 2. 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!
- 3. 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
- 4. 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)
- 5. 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
- 6. FIG1.example of microbial fuel cells producing electricity through different mechanisms of electron transfer to the anode.
- 7. Microbial electron production Geobactteraceae (G.metallireducens, G.sulfureducens)
- 8. FIG3.generalized pathway for the 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.
- 9. FIG4.Model for Geobacter sulfurreducens electron transfer to the anode of microbial fuel cell from NADH derived from organic matter oxidation.
- 10. FIG5.Proposed mechanisms for electron transfer to the anode of microbial fuel cells.
- 11. FIG6.A mechanism for extracellular electron transfer by Geobacter sulfurreducens.
- 12. FIG8.Transmission electron micrograph of 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.
- 13. Applications Power generation Education Biosensor Powering underwater monitoring devices
- 14. 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.