FIGURE 2.

Inverse isothermal compressibility coefficient of phospholipid monolayers plotted against the surface pressure. Monolayers of PSM (—▴—), DMPC (–□–), DMPE (·⋯▾⋯·), and PCPE (—··○··—)were compressed on water at 22°C at a speed of 10 mm/min to a given target pressure. The barrier was programmed to oscillate for 2 min with an area change set to 0.5% and the frequency at 40 mHz. The curves are representative curves of two separate experiments.