The model contains three varying parameters called S1, S2 and S3 and three constant parameters called k1, k2 and k3. (Note that indeed S1, S2 and S3 are parameters and not species in this model.)
The model contains three rules defined as:
Type | Variable | Formula |
Rate | S1 | k3 · S3 − k1 · S1 |
Rate | S2 | k1 · S1 − k2 · S2 |
Rate | S3 | k2 · S2 − k3 · S3 |
The model contains one event that assigns values to both parameters S1 and S2:
Trigger | Delay | Assignments | |
Event1 | S1 < 0.75 | 1.5 | S2 = 1.5 |
S1 = S2 |
Note that the event assignments should happen simultaneously, not sequentially; i.e., the value of S2 assigned to S1 is the value at the point at which the event was triggered.
The initial conditions are as follows:
Value | Units | |
Initial amount of S1 | 1.0 | any |
Initial amount of S2 | 2.0 | same as S1 |
Initial amount of S3 | 1.0 | same as S1 |
Value of parameter k1 | 0.75 | second-1 |
Value of parameter k2 | 0.55 | second-1 |
Value of parameter k3 | 0.25 | second-1 |