Calculations were conducted for various reaction conditions. A steady state was achieved in all cases. The concentrations of chemical substances in a steady state increased nearly in parallel with uniform increases in the external concentrations of source substances. However, the concentration profile in a steady state showed little dependence on such uniform increases in the external concentrations of source substances; by contrast, it strongly depended on their nonuniform changes. Similarly, the concentration profile depended only slightly on uniform increases in kf and kdi, although it strongly depended on their nonuniform changes. Interestingly, the concentration profile in a steady state remained the same when the initial concentrations of almost all chemical substances in the ORN were chosen to be zero and the other reaction conditions were unchanged, indicating that the external concentrations of source substances mainly determine what steady state is formed.