Polymorphism in biophysics is the aspect of the behaviour of
lipids that influences their long-range order, i.e. how they aggregate. This can be in the form of spheres of lipid molecules (
micelles), pairs of layers that face one another (lamellar phase, observed in biological system as a lipid
bilayer), a tubular arrangement (
hexagonal), or various
cubic phases (Fd3m, Im3m, Ia3m, Pn3m, and Pm3m being those discovered so far). More complicated aggregations have also been observed,
rhombohedral,
tetragonal and
orthorhombic phases have been observed.
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