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Methods in Membrane Biology - Volume 7 (Paperback, 1976)
Loot Price: R1,463
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Methods in Membrane Biology - Volume 7 (Paperback, 1976)
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The contributions of electron microscopy to membrane biology have
been indispensable and, at the same time, disappointing. Membranes
were known to exist before the advent of electron microscopy and
general principles of their composition and molecular organization
had been deduced from permeability and electrical conductivity
measurements, polarized light microscopy, and X-ray diffraction. On
the other hand, the complexities of the many intracellular
membranes and membranous organelles were really not suspected until
they were observed by the electron microscopist. One then had
further hopes that the high resolution of the electron microscope
(theoretically it can resolve atomic distances) would allow the
visualization of the molecular architecture of membranes and lead
directly to an under standing of structure and function at the
molecular level. This expectation has been largely unrealized.
Because of the great difficulties encountered in the preparation of
biological material, because of the uncertainty of the chemistry of
"staining," and because of numerous electron optical artifacts, it
has been a major challenge just to rationalize the observed images
in terms of the known facts, let alone to utilize the images to
expand our knowledge of the molecular structure of biological
membranes. The many differences among membranes with respect to
function and composition are lost in the universal trilamellar
image. Perhaps the one major exception to this, and the major
structural contribution of electron microscopy at the molecular
level, has come from freeze-etch electron microscopy."
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