Sandwich Embedding of Monolayers of Cells in Epoxy Resin for Ultrathin Sectioning

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Abstract
In this procedure for embedding monolayers of cells, the usual glass slides are replaced by plates of resin 1-1.5 mm thick. Unlike the open-face embedding technique, the present procedure uses only a few drops of unpolymerized resin, which are applied to the fixed and dehydrated cells. During polymerization this small amount of liquid resin spreads across a relative large area, leaves the cells covered by a very thin layer, and permits phase contrast observations through it. Ultrathin sections of a particular cell encircled by a rotary scriber can be obtained by sectioning the resin slide, which has been trimmed and mounted directly in the specimen holder of the ultramicrotome.

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