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Temperature-composition diagram for DEPE/sphingosine in excess water, pH 7.4. (•, ○) Onset and completion temperatures of the gel-fluid lamellar phase transition, derived from DSC thermograms. (▾, ∇) Onset and completion temperatures of the lamellar-to-inverted hexagonal phase transition, also derived from DSC thermograms. Lβ, lamellar gel phase Lα, lamellar fluid phase HII, and inverted hexagonal phase. Average of three measurements. The SD are about the size of the symbols.
