FIGURE 4.

Predictions for the diffusion around an oocyte: results for pH. Each panel shows the pH obtained from the numerical solution of Eq. 2 (solid black curves) and from the evaluation of the solution of the linearized system (Eq. 4) (dashed gray curves) at the indicated current values and total buffer concentrations. The traces correspond to time steps of 0.1, 0.2, 0.5, 1, 2, and 5 s. The x axis gives the distance from the oocyte center in micrometers. The complementary error function used in Eq. 4 was evaluated using code from Press et al. (27) implemented in double precision.