student presentation in azad university

1. Compiler:Yashgin Hassanzadeh

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.