The model contains one compartment called C. There are four species called S1, S2, S3 and S4 and three parameters called k1, k2 and p1. Species S4 is labeled as a constant species. The model contains two reactions defined as:
Reaction | Rate |
S1 + S2 → S3 | k1 · S1 · S4 · C |
S3 → S1 + S2 | k2 · S3 · C |
The model contains one initialAssignment:
Variable | Formula |
S4 | p1 · 2 |
Note: SBML's InitialAssignment construct override any declared initial values. In this model, the initial value for the species S4 has not been explicitly declared and must be calculated using the InitialAssignment.
The initial conditions are as follows:
Value | Units | |
Initial amount of S1 | 0.25 × 10−1 | mole |
Initial amount of S2 | 2.0 × 10−1 | mole |
Initial amount of S3 | 1.0 × 10−1 | mole |
Initial amount of S4 | undeclared | mole |
Value of parameter k1 | 0.75 | litre mole-1 second-1 |
Value of parameter k2 | 0.25 | second-1 |
Value of parameter p1 | 5 × 10−2 | mole |
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) they must be treated as concentrations where they appear in expressions.