Before revision:  The model consists of ordinary differential equations ( ODE) resembling chemostats or continuous stirred tank reactors (CSTRs), an ODE for an extracellular mediator involved in electron transfer , and an algebraic constraint for electric current and hydrogen production.
After revision:  The model consists of ordinary differential equations ( ODEs) for concentrations of substrate, URLanisms, and an extracellular mediator involved in electron transfer , and an algebraic constraint for electric current and hydrogen production.