Chapter 21: Membranes: Self-Assembly and the First Distinction

The lipid bilayer membrane is the physical realization of the lemniscate boundary 𝕃 = S¹ ∨ S¹: inside versus outside is self versus non-self, the first distinction in carrier form. Amphiphilic molecules spontaneously form bilayers without external templates, so the distinction self-assembles. The four molecular families—proteins, lipids, carbohydrates, and nucleic acids—each map to a sector, while protein folding is recast as Yang–Mills-type energy minimization on a conformational landscape.