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Ultrastructural autometallography: a method for silver amplification of catalytic metals

G Danscher and JO Rytter Norgaard

The autometallographic technique involves application of a silver bromide-containing emulsion on the surface of ultrathin sections placed on grids that are subsequently exposed to a photographic developer. In tissue sections from animals treated intravitally with gold, silver, or mercury compounds, accumulations of the metals are visualized by autometallography and can be used for quantitative studies. After amplification, sections can be stained with lead citrate and uranyl acetate. Using autometallography, particles of colloidal gold dispersed in a film of gelatin showed a time-dependent growth and were gradually amplified up to 3.5-fold after 15 min of development. Hence the method may prove useful tracing colloidal gold particles in sections with low particle density, and be a powerful tool for revealing metals in biological tissues.

Volume 33, Issue 7, pp. 706-710, 07/01/1985
Copyright © 1985 by The Histochemical Society


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