By D. Branton, D. W. Deamer (auth.)
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Extra resources for Membrane Structure
Tissues are rapidly frozen and then fractured under vacuum (Fig. 8). After fracture a small amount 42 II/Ell: D. BRANTON and D. W. DEAMER. Me mbrane Structure of ice may be sublimed (etched) from the fractured face, and the etched surface is then shadowed and replicated. Examination of the replica in the electron microscope reveals extensive face views of membranes. - spczcimczn b c fracturing : cold kn ifcz Spczcimczn tablcz e etching : 9 replica viewed in electron microscope : Fig. 8. Freeze-etching.
BRANTON and D. W. DEAMER, Membrane Structure Fig. 15. Oblique fracture through a guinea pig retinal rod outer segment showing parts of several disc membrane fracture faces. One of the faces (arbitrarily labeled "A") has the appearance of shallow, irregularly shaped pits surrounded by steep, interconnecting ridges. The other face (arbitrarily labeled "B") has the appearance of worn cobblestone pavement. x 63,000. From BRANTON and CLARK (1968). Fig. 16. Face views of chloroplast lamellae. Three different kinds of faces can be seen.
The classical trilaminar image was produced only when denaturing conditions (heat or acetone dehydration) were introduced during specimen preparation. It was concluded that the trilaminar image is an artifact produced by rearrangement of denatured protein during specimen preparation. Lucy (1964) and Lucy and GLAUERT (1963) have proposed a dynamic membrane model in which the lipid may undergo a transition from bilayer configurations to a micellar state. In the micellar state proposed by Lucy and GLAUERT, micellar lipid and globular protein are present in a mosaic of 40 A subunits.