The model contains one compartment called C. There are three species called S1, S2 and S3 and one parameter called k. The model contains one reaction defined as:
Reaction | Rate |
S1 → S2 | C · k · S1 |
Reaction S1 → S2 defines one local parameter k which has a scope local to the defining reaction and is different from the global parameter k used in the assignmentRule.
The model contains one rule which assigns value to species S3:
Type | Variable | Formula |
Assignment | S3 | k · S2 |
In this case the initial value declared for species S3 is consistent with the value calculated by the assignmentRule. Note that since this assignmentRule must always remain true, it should be considered during simulation.
The model contains one event that assigns a value to species S2:
Trigger | Delay | Assignments | |
Event1 | S1 < 0.25 | − | S2 = 1 |
The initial conditions are as follows:
Value | Units | |
Initial amount of S1 | 1 | mole |
Initial amount of S2 | 0 | mole |
Initial amount of S3 | 0.375 | mole |
Value of parameter k | 0.75 | dimensionless |
Value of local parameter k | 5 | second-1 |
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.