By C. Sandri
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Additional resources for Membrane Morphology of the Vertebrate Nervous System: A Study with Freeze-etch Technique
The addition of a surface layer of metal tends to enlarge particles and fill in depressions. , 1963). (ii) Contamination. A layer of adsorbed water or hydrocarbon material from the pump system could resemble and add to the artifact resulting from shadowing. Dirt, crystals, residual tissue, etc. may adhere to the finished replica (Figs. 4b, 6a-c) and impair the preparation. (iii) Heating. During the shadowing process sufficient heat may be transferred to the frozen surface to melt the edges of the holes.
Triangles = tissue displaced by uneven cutting. 23 24 Fig. 5. Efsects of heavy etching and slow freezing a: Example of heavy etching. The E face (EF) of the plasma membrane of a perivascular cell has collapsed upon the collagen fibers (Col) and their outlines appear as ridges (arrows) on the left. On the right the E face was swept away in the fracture revealing collagen fibers with the typical periodic cross-banding. b: Pigeon optic tectum. Slow freezing of unfixed tissue soaked in 25% glycerol.
10). This is due to the fact that the two layers and the lucent interspace, each 2-3 nm in thickness, lie close to the limits of resolution imposed by the thickness of the platinum coating on the fractured and etched tissue surface. In addition, any contamination will tend to selectively fill the depression between the lamellae. In favorable preparations, the electron-dense margins of the membrane (which represent the hydrophilic ends of the lipid molecules, Branton, 1969) are represented by two small ridges with a depression between, corresponding to the electron-lucent central region.
Membrane Morphology of the Vertebrate Nervous System: A Study with Freeze-etch Technique by C. Sandri