Fig. 8. Mathematical model of reaction rate for the case without diffusion as a function of the two reaction rate constants with a fixed diffusion distance (L=104.5 µm) and O₂ boundary concentration of 7.85 µM. The broken line is for the case of k₁=0.000635 s^–1, which satisfies the experimentally measured rate of AP recovery of 0.379 mmol l^–1 min^–1 in the limit of large k₂.