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Vesicles intermediate structures between

The information provided by the 31P-NMR spectra of DOPE/16 as a function of temperature and the extent of polymerization was critical to the characterization of the nature of the lipid structures responsible for the destabilization of the photolyzed DOPE/16 vesicles [73]. The progressive appearance of an isotropic NMR signal at the expense of the lamellar signal (Fig. 14) indicated that a lipid structure with isotropic symmetry was associated with the photo-induced leakiness of DOPE/16 vesicles. The enriched domains of PE facilitates the interaction and formation of intermediate lipid structures between bilayers, with the eventual development of an ILA(s) that connect the bilayers of an... [Pg.76]

Various studies suggested the existence of stmctures intermediate between micelles and vesicles. These structures—perforated vesicles, bilayer fragments, giant worm-like micelles, ring-like micelles, and disk-like micelles, depending on the investigated system—were... [Pg.865]

Tubular vesicles made of C14 butadienic lipids (Figure 26.1) containing two conjugated double-bonds per chain, (T < 20° C) reversibly transform into chains of pearls when the temperature is decreased from 20°C to 10°C [1]. These structures are called unduloids and are known to present an intermediate state between cylinder and sphere necklace morphologies. By polymerization using irradiation of ultraviolet light at 254 nm, this transformation becomes irreversible and vesicles remain in the chain of pearls configuration indefinitely. [Pg.342]

There is also a group of the so-called lyotropic nematics. They are intermediate between the isotropic micellar phase and structured (lamellar or hexagonal) phases and can be formed by both discotic and calamitic molecules. The lyotropic nematics can be aligned by an electric or magnetic field and show Schlieren texture as thermotropic nematics. The building blocks of these mesophases are vesicles or similar mesoscopic objects. From the symmetry point of view the nematic phases can be uniaxial or biaxial, as shown in Fig. 4.22. In fact, the biaxial nematics have been found unequivocally only in the lyotropic systems [13]. [Pg.54]


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Intermediate structures

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