The model contains one compartment called "compartment". There are four species named S1, S2, S3 and S4 and three parameters named k1, k2 and p1. The model contains two reactions defined as:
Reaction | Rate |
S1 + S2 → S3 | k1 · S1 · S2 · compartment |
S3 → S1 + S2 | k2 · S3 · compartment |
The model contains one rule:
Type | Variable | Formula |
Assignment | S4 | multiply(p1, S2) |
The model contains one FunctionDefinition defined as:
Id | Arguments | Formula |
multiply | x, y | x · y |
Note that in this case the initial value of the species S4 is not explicitly declared and must be calculated by the AssignmentRule.
The initial conditions are as follows:
Value | Units | |
Initial amount of S1 | 1.0 × 10−4 | mole |
Initial amount of S2 | 2.0 × 10−4 | mole |
Initial amount of S3 | 1.5 × 10−4 | mole |
Initial amount of S4 | undeclared | mole |
Value of parameter k1 | 0.75 × 104 | litre mole-1 second-1 |
Value of parameter k2 | 0.25 × 10−2 | second-1 |
Value of parameter p1 | 0.75 | dimensionless |
Volume of compartment "compartment" | 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.