Various species of bacteria belonging to taxonomically separate genera were studied by using electron microscopy and different cytochemical staining methods. Judging from our results and those reported previously in the literature, we concluded that the periodic acid-thiocarbohydrazide-silver proteinate reaction (Thiéry method) separates the bacteria into four large groups according to the production of silver grains at the site of the cell wall or the cytoplasmic membrane or both. In the group only the cytoplasmic membrane reacts; in and only the cell wall reacts; in and both the cell wall and the cytoplasmic membrane react; and in and neither the cell wall nor the cytoplasmic membrane reacts. Moreover, this staining method clearly separated from certain leprosy-derived coryneform bacteria.


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