The cubic phase of monoglyceride-water systems. Arguments for a structure based upon lamellar bilayer units

Lipidic intramembranous particles

“…This structure greatly resembles a cubic phase that has been proposed for monoglycerides in water [53,55] and which is possibly intermediary between the lamellar and H H phase (see subsection IIIC.). Of the various factors which might be responsible for the unique structure of the prolamellar body, the H H phase-preferring MGalDG [20,73] is the most likely.…”

“…6. These multiple 'fission' points will result in a structure in which direct contact of the aqueous compartments occurs (these were initially separated) and which is compatible with the cubic structure suggested for monoglycerides [52,53] for MGIucDG/DGIucDG [41] and the etioplast [54]. Further dehydration and fusion of this strongly curved bilayer system may lead to the formation of stacked aggregates of inverted micelles.…”

“…Recently, both interpretations have been the subject of debate [42,43]. Based on X-ray diffraction data, it has been suggested that these quasi-crystalline structures in fact correspond with an isotropic cubic phase of a type reported in X-ray diffraction studies on soaps and detergents [52] and simple monoglycerides [53].…”

A mesoscopic Archimedean tiling having a new complexity in an ABC star polymer

“…4.3.4) Soft materials consisting of different chemical/ physical species in a molecule such as lipids, 1 amphiphiles, 2 block copolymers, 3 and copolymerbased supramolecules 4 are well known to form periodic structures spontaneously because of their intramolecular segregation and self-assembling nature. In addition to classical structures like BCC-packed spheres, hexagonally packed cylinders, and lamellar structures found in early days, 5 extraordinary periodic structures, i.e., bicontinuous 6 and tricontinuous double Gyroid, 7 plumber's nightmare, 8 etc., have been found one after another for various soft material systems.…”

Structural transitions of the mono-olein bicontinuous cubic phase induced by inclusion of protein lysozyme solutions

“…In preliminary experiments, we also observed that the SAXS patterns changed with time, where the change tended to follow the order of Pn3m + Im3m → Pn3m. Many lipid-water systems are now known to form bicontinuous cubic phases [12,13,14,15,16,17]. It is also known [19] that three cubic structures with the space groups of Ia3d, Pn3m, and Im3m are most common and are formed on the basis of triply periodic minimal surfaces (TPMS), called respectively "G (gyroid)", "D (diamond)" and "P (primitive)" surfaces.…”