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. 2003 Apr;84(4):2768–2780. doi: 10.1016/S0006-3495(03)75081-4

TABLE 4.

Characterization of ionizable groups at the outer membrane surface of N1E-115 neuroblastoma cells, with the average surface charge densities (σnet) and intrinsic association constants for different divalent cations

K1 (M−1) K2 (M−1)
σnet (e2) ψ0 (mV) Na Ba Mg Ca
−0.0087 −89 0.02 1.7 6.1 25.3