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Updated: May 3, 2026

Fundamental Technical Elements of Freeze-fracture/Freeze-etch in Biological Electron Microscopy
Published on: September 11, 2014
Crystalline fibrils and complexes of membranes in the parietal layer in sieve elements
1Department of Botany, University of Aberdeen, St. Machar Drive, Old Aberdeen, Scotland.
Abstract:
Fibrils are described which were found in the parietal layer in well differentiated sieve elements under the electron microscope. The fibrils were usually about 0.1 micrometers wide and appeared, in longitudinal section, to be composed of closely parallel filaments. In transverse section they appeared as a lattice, possibly of closely packed tubules. Some of the fibrils were joined to complexes of membranes in the parietal layer and to plasmatic filaments. Their relationship to these structures and to fibrils which may cause movements in other kinds of cells is discussed.
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