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