Abstract
SOLUTIONS of lead are now widely used by some electron microscopists for the production of a general increase in the electron density of cellular constituents in sections of biological material fixed in osmium tetroxide and afterwards embedded in methacrylate or ‘Araldite’. Grids bearing the sectioned specimens may be floated face downwards for a few minutes on the surface of weakly ionized lead solutions, for example, lead acetate or ‘alkaline’ lead hydroxide1. During this exposure lead ions become attached to the osmium already deposited on the material during fixation, with a consequent improvement of specimen contrast in the electron beam.
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References
Watson, M. L., J. Biophys. Biochem. Cytol., 4, 727 (1958).
Peachey, L. D., J. Biophys. Biochem. Cytol., 5, 511 (1959).
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LEVER, J. A Method of staining Sectioned Tissues with Lead for Electron Microscopy. Nature 186, 810–811 (1960). https://doi.org/10.1038/186810a0
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DOI: https://doi.org/10.1038/186810a0
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