The model contains two compartments named compartment and compartment1. There are four species named S1, S2, S3 and S4 and three parameters named k1, k2 and k3. Compartment "compartment" contains species S1 and S2. Compartment "compartment"1 contains species S3 and S4. The model contains two reactions defined as:
Reaction | Rate |
S1 + S2 → S2 + S2 | k1 · S1 · S2 · compartment |
S2 → S3 | k2 · (S2−S3) · compartment1 |
The first reaction occurs entirely in compartment "compartment", whereas the second reaction occurs between a species in "compartment" and a species in "compartment1".
The model contains one rule which assigns value to species S4:
Type | Variable | Formula |
Assignment | S4 | k3 · S3 |
In this case the initial value declared for species S4 is consistent with that calculated by the assignmentRule. Note that since this assignmentRule must always remain true, it should be considered during simulation.
The initial conditions are as follows:
Value | Units | |
Initial amount of S1 | 1.0 | mole |
Initial amount of S2 | 1.0 | mole |
Initial amount of S3 | 0 | mole |
Initial amount of S4 | 0 | mole |
Value of parameter k1 | 0.75 | litre mole-1 second-1 |
Value of parameter k2 | 0.25 | second-1 |
Value of parameter k2 | 0.25 | dimensionless |
Volume of compartment "compartment" | 1 | litre |
Volume of compartment "compartment"1 | 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.