Fig. 3.

The dependence of total surface concentration of L-α-phosphatidylcholine from egg yolk, versus the logarithm of Me²⁺ ions concentration: Sr²⁺ (a), Cd²⁺ (b), Ba²⁺ (c), Pb²⁺ (d). (symbols for figures: filled square, the experimental values; continuous line, the theoretical curves; dashed line, $c_{\text{L}}$ form; dashed single dotted line, $c_{{\text{LMe}}^{2+}}$ form and dashed double dotted line, $c_{{\text{L}}_2{\text{Me}}^{2+}}$ form) at surface pressure ~40 mN m⁻¹