Fig. 3From: Bacterial extracellular electron transfer: a powerful route to the green biosynthesis of inorganic nanomaterials for multifunctional applicationsIllustration of the thermodynamic feasibility for microbial reduction of metal ions to elemental forms under anaerobic condition (a), and the biosynthesis of MNPs through microbial reduction of metal ions both inside and outside cells (b)Back to article page