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Electron Microscopy of Biological Membranes

  • Kurt Mühlethaler
  • Frances Jay

Abstract

The study of the molecular organization of cellular membranes has been considerably hampered by their extreme thinness. For about 100 years it was postulated that the outermost zone of the cell is covered by a special organized layer called the cell membrane (Nägeli and Cramer, 1855; Overton, 1899; Gorter and Grendel, 1925; Danielli and Davson, 1935). With the introduction of the electron microscope in 1933, it was hoped that the presence and structure of this delicate cell component could be visualized. In the first electron micrographs of cultured cells, a definite boundary at the periphery of the cytoplasm could be seen, but new information regarding its structure was not obtained (Porter et al., 1945). A new substructure was observed by Robertson in 1958 using fixation with the potassium permanganate method as introduced by Luft (1956). The cell membrane appeared as a triple-layered structure, consisting of two dense strata, each about 2.5 nm thick, bordering a light central zone of about equal thickness. These dimensions were in good agreement with the model put forward by Danielli and Davson (1935). Since various authors observed similar tripartite membranes in a number of cells, the unit membrane concept became generally accepted. It was concluded that all biological membranes consisted of the same kind of fundamental structure pattern, i.e., a lipid bilayer arranged with the polar heads of the molecules pointing outwards and covered by a protein layer.

Keywords

Biological Membrane Colloidal Gold Lateral Diffusion Fracture Face Photosynthetic Membrane 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1985

Authors and Affiliations

  • Kurt Mühlethaler
    • 1
  • Frances Jay
    • 1
  1. 1.Institute for Cell Biology, Federal Institute of TechnologyETH-HönggerbergZürichSwitzerland

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