A diverse range of microorganisms are found in association with electrodes in MFC systems,
especially when an environmental inoculum is used to seed the MFC . A general term for
bacteria associated with a surface is a biofilm. It is likely that not all of the organisms associated anode
biofilm interact directly with the anode but may interact indirectly through other members of the
electrode community. For example, Brevibacillus sp. PTH1 was found to be an abundant member of a
MFC community. Power production by Brevibacillus sp. PTH1 is low unless it is cocultured with a
Pseudomonas sp. or supernatant from a MFC run with the Pseudomonas sp. is added .