Many mathematical models in the literature are described with
differential rate equations for the species. You could manually convert
the equations to reactions, or you could enter the equations as rate
rules. For example, you could enter the following differential rate
equation for a species `C`

:

$$\frac{\text{dC}}{\text{dt}}\text{=vi-vdX}\frac{\text{C}}{\text{Kc+C}}\text{-kdC}$$

as a rate rule in SimBiology^{®}: ```
C = vi - (vd*X*C)/(Kc
+ C) - kd*C
```

Was this topic helpful?