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An innovative coating technique for light and electron microscopic autoradiography

GV Kornhauser, JM Krum and JM Rosenstein

Department of Anatomy, George Washington University Medical Center, Washington, DC 20037.

We describe a modified nuclear emulsion coating technique for both electron and light microscopic autoradiography. We propose that by reversing the application of formvar film so that it adheres to and covers thin sections placed on grids, we have developed a technically accessible methodology that produces optimal conditions for the tracing of specific nuclear activity. A smooth, continuous base is formed over the sections on which a monolayer of evenly packed silver halide crystals can be applied by dip-coating. The same principle is applied to pre-stained 1-micron plastic sections of glass slides. We suggest that the application of formvar film over thin sections does not impede or interfere with the exposure of the emulsion by the labeled tissue. On the contrary, it virtually eliminates contamination and background radiation, enhancing the specificity and quality of resolution at even low magnifications. This technical modification, which facilitates the application of the emulsion, could render electron microscopic autoradiography a routine laboratory procedure, allowing for easily reproducible results and quantitative evaluation. At the light microscopic level, this technique prevents chemical fogging caused by certain stains, and thus allows routine pre-staining before coating with emulsion.

Volume 40, Issue 6, pp. 879-882, 06/01/1992
Copyright © 1992 by The Histochemical Society


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