Simulation of the CVs of CcO immobilized in a ptBLM with cyt cox (a) and cyt cred (b) added to the bulk solution under anaerobic (open circles) and aerobic conditions, considering Eq. 1 coupled to Eq. 8. Parameters: E0 = 0.405 V, [cyt c] = 0.18 mM, [CcO] = 0.18 mM, [O2] = 0.256 mM, scan rate 50 mV/s, kS1 = 56 s−1, kf8 = 103 (solid line), 104 (dashed line), and 105 Mol l−1 s−1 (dash-dotted line).