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. 2009 May;133(5):497–509. doi: 10.1085/jgp.200910211

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© 2009 Boda et al.

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Figure 6. — Competitive “binding” of Ca²⁺ and Na⁺. Average numbers of Ca²⁺ (increasing curves) and Na⁺ (decreasing curves) absorbed into the central region of the pore. (A) CaCl₂ added to 0.03 M NaCl (closed symbols) or to 0.03 M NaCl + 0.09 M MCl (M⁺ is a “large” cation of radius 2.5 Å). (B) Varied amounts of CaCl₂ added to baths containing different fixed concentrations of NaCl.