Microbial Fuel Cell Reaction
Anode reaction,

$\small Glucose + 2NAD^+ (Embden-Meyerhof pathway) \leftrightharpoons 2 Pyruvate + 2NADH$

$\small Pyruvate + Ferredoxin_{(ox)} (Pyruvate-ferredoxin Oxidoreductase) \leftrightharpoons Acetyl-CoA + CO_2 + Ferredoxin_{(red)}$

$\small NADH + Ferredoxin _{(ox)} (NADH-Ferredoxin Oxidoreductase) \leftrightharpoons NAD^+ + Ferredoxin_{(red)}$

$Ferredoxin_{(red)} (Hydrogenase)\leftrightharpoons Ferredoxin_{(ox)} + 2H^+ + 2e^-$

[Last one: http://en.wikipedia.org/wiki/Ferredoxin_hydrogenase]

Cathode reaction,

$4 H^+  + 4e^- + O_2 \leftrightharpoons H_2O$

$C_6H_{12}O_6 + 6O_2 \leftrightharpoons 6 CO_2 + 6 H_2O, DG° = - 2870 kj$

Full paper: http://www.altenergymag.com/emagazine.php?issue_number=07.04.01&amp;article=haldia