Abstract

SUMMARYA post‐polymerization en bloc staining method for high voltage electron microscopy is described. Embedded specimens were initially trimmed to an area close to the point of interest. Trimmed blocks were stained in 5% uranyl acetate/75% ethanol solutions for 36 h at 333 K. This procedure allowed specimens to be stained without the necessity of exposing Formvar films to damaging solutions. After such staining, both the contrast and fine detail of structures such as microfilament bundles were superior to that seen in material stained with aqueous solutions of uranyl salts.

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