Biomedical Engineering Reference
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previously. When multiple component lipid A-particles were constrained by their
neighbors to form a permanent ellipsoidal cluster, denser colloidal crystal of the lipid
A-phosphate assemblies developed (Batista and Miller, 2010).
Figure 7.
(A) A cubic lipid A-diphosphate colloidal crystal of single component self-assembled
cluster with a unit cell dimensions of
a
= 36.5 nm. This cubic quasicrystal can be subdivided into
rhombohedral unit cells (one unit cell is shown in G) used to construct the icosahedral quaisicrystal
packing, In (B) a process is shown by which a cuboctahedron (in shape as noticed in
Figure 3
(E) and
(H)) of 12 rods of various lipid A-phosphates, jointed at their ends (thin lines) in the self-assembly can
be moved by rotations of its triangular faces about their normal to yield a regular icosahedron (thick
lines and dotted lines), (C) Icosahedral packing of equal spheres for lipid A-diphosphate encountering
multiple lipid A-phosphates (shown in the last row as colored spheres representing different single
lipid A-phosphates present in the
E. coli autovaccines
), and only the third layer is shown. On each
triangular face the layers of spheres succeed each other in cubic close-packing sequence by applying
a distorted tetrahedron. This arrangement follows the suggestions proposed by Mackay (1962), (D)
Shows
an idealized 3-D colloidal crystal composed of identical and non-identical lipid A-phosphates
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