  We propose a model for bacterial Quorum Sensing based on an auxiliary
electrostatic-like interac-tion originating from a fictitious electrical charge
that represents bacteria activity. A cooperative mechanism for charge/activity
exchange is introduced to implement chemotaxis and replication. The bacteria
system is thus represented by means of a complex resistor network where link
re-sistances take into account the allowed activity-flow among individuals. By
explicit spatial sto-chastic simulations, we show that the model exhibits
different quasi-realistic behaviors from colo-ny formation to biofilm
aggregation. The electrical signal associated with Quorum Sensing is ana-lyzed
in space and time and provides useful information about the colony dynamics. In
particular, we analyze the transition between the planktonic and the colony
phases as the intensity of Quorum Sensing is varied.
