biofilms formed around the surfaces which it use as an electron acceptor
the formation of biofilms is possible because of pili
gene involved
wild type cells that express the gene are able to form biofilms on almost any surface
mutants that have a pilA deletion can adhere to different surfaces but are not able to either express pili or form thick biofilms
complemented pilA mutants (having a pilA gene reinserted) are once again able to express pili and form biofilms