The model contains one compartment called C. There are four species called S1, S2, S3 and S4 and three parameters called k1, k2 and k3. The model contains two reactions defined as:
Reaction | Rate |
S1 → S3 | k1 · S1 · C |
S3 → S1 | k2 · S3 · C |
The model contains two rules:
Type | Variable | Formula |
Assignment | S4 | k3 · S1 |
Rate | S2 | k2 · S3−k1 · S1 |
Note that in this case the initial value declared for species S4 is inconsistent with the value calculated by the assignmentRule. The calculated value should be used.
The model contains one event that assigns a value to species S2:
Trigger | Delay | Assignments | |
Event1 | S1 > 0.000015 | − | S3 = 0.00001 |
The initial conditions are as follows:
Value | Units | |
Initial amount of S1 | 1 × 10−5 | mole |
Initial amount of S2 | 1.5 × 10−5 | mole |
Initial amount of S3 | 1 × 10−5 | mole |
Initial amount of S4 | 2.25 | mole |
Value of parameter k1 | 0.015 | second-1 |
Value of parameter k2 | 0.5 | second-1 |
Value of parameter k3 | 1.5 | dimensionless |
Volume of compartment C | 1 | litre |
The species values are given as amounts of substance to make it easier to use the model in a discrete stochastic simulator, but (as per usual SBML principles) their symbols represent their values in concentration units where they appear in expressions.