A non-spatial ODE model contains reaction rates that specify a rate of change of species total amount in a given compartment.

In a PDE model, we have two kinds of reactions

  • Compartment reactions
    • take place everywhere within a compartment

    • units: rate of change of species concentration

  • Membrane reactions
    • take place on the membrane between two compartments

    • units: rate of species amount crossing unit area of the membrane

When editing a reaction, an image of the location is displayed on the left, and the units are displayed below the reaction rate in the bottom right.

screenshot of the reactions in a model

Editing the reactions in a spatial model.