Lipids in Membranes - Membrane Biophysics, Biological and Medical Physics, Biomedical Engineering - page 35

H II phase alters bilayer structure
Seven unit cells of a H II lattice
Fig. 3.3 In the non-lamellar phases the non-bilayer propensity is shown in the top panel .The bottom
panel shows the seven unit cells of a hexagonal lattice. The huge intrinsicmonolayer curvaturemakes
a major structural difference between the non-lamellar structures and lamellar structures (shown
in Fig. 3.2 ). The model structures are drawn in light of the previously published results [ 7 , 14 ]. In
Gruner's model [ 7 ] it is suggested that the annulus regions in inverse hexagonal structure, which
exist at the farthest distance from the nearby polar cores, are filled with hydrocarbons at nearly
relaxed lengths. This hypothesis is not well established based on experimental data and requires
serious re-investigation