Comparison of swelling of liver and kidney mitochondria. The blue + signs form the swelling curve from the swelling experiment with 50 μ M Ca2+ in liver, the red + signs with the same amount in kidney. The solid black lines are the corresponding rescaled numerical approximations of the volume (V (t)) obtained from the model. Optimized parameter values: for liver τ = 16.2803, a = 0.2544, b = 0.0118, k = 0.7360; for kidney: τ = 24.6519, a = 0.2522, b = 0.0193, k = 0.8859. Relative least squared error 7.8132e-04 for liver and 9.0954e-04 for kidney.