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4. Freeze-fracture electron micrograph of a 50:50 mixture of dielaidoylphosphatidylcholine and dipalmitoylphosphatidylcholine quenched from 23°C, a temperature corresponding to the midpoint in the phase diagram of Fig. 3a, where equal proportions of solid and fluid phase lipids are predicted to coexist. Notice the absence of particles in the banded regions which are thought to be solid lipid domains. Reproduced with permission from McConnell (1975b). , 1974). These particles are excluded from certain membrane regions during slow cooling, and it is thought that the excluded regions represent solid phase lipid.

5 h at 30°C. Using radioactively labeled phosphatidylcholine vesicles and a beef heart phospholipid exchange protein, Johnson et al. (1975) found that about 60% of the label was rapidly transferred to the unlabeled vesicles by the exchange protein; the other 40% being transferred with a half-time of approx. 40 h at 20°C. Similarly, Sherwood and Montai (1975) estimated the half-time for flip-flop of oleyl acid phosphate to be 15-19 h at 22°C. When mixed lipid dispersions are sonicated, or when cholesterol is added to vesicular lipid dispersions, preferential partitioning of specific lipids to inner or outer bilayer halves can occur.

Weinstein and McNutt (1972) have grouped cell junctions into two major categories: junctions that join cells in close or direct contact (zonulae occludentes, gap or nexus junctions and septate desmosomes); and junctions which join cells separated by 15-30 nm distances (zonulae adhérentes, macula adherens, desmosomes). , 1976; McNutt, this volume, p. 75), but their structures appear to share the common property of developing from "subunits" which form supramolecular aggregates both in the membrane 35 MOBILITY RESTRAINT MECHANISMS PLANAR AGGREGATION OR ASSOCIATION mull -* 111 PROTEIN LIPID ASSOCIATIONS ASSOCIATIONS DOMAIN FORMATION — ÏÏÏÏaïïMÎ 0ORR I WM ïMûm RANDOM SEQUESTRATION EXCLUSION PERIPHERAL MEMBRANE COMPONENTS INNER SURFACE UNCOUPLED OUTER SURFACE MEMBRANE-ASSOCIATED (CYTOSKELETAL) COMPONENTS y< i> TRANSLOCATION UNCOUPLED (STATE I) UNCOUPLED (STATE 2) Fig.

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