[Development method providing fine-grain electron microscopic radioautographs].

A modification of the development of electron microscopy autoradiographs with p-phenylenediamine is suggested. The development in the mode described was found fairly convenient for bacteriological studies. The method provides small silver grains specific in shape, which leave open the greater part of a bacterium even in the presence of considerable accumulation of silver grains. The grains can be readily counted. The development results are reasonably reproducible.