Abstract
Results obtained by staining plasmalemma and mucilage with phosphotungstic acid (PTA) are described. Plasmalemma are strongly contrasted by staining with PTA and it is possible to study the way in which the membranes of the secretory vesicles are restructured. Contrary to what has already been reported for D. capensis, structural alteration of the membranes only starts at the moment when the vesicles open in the periplasm. The very great affinity of PTA for mucilage was confirmed and the images obtained with this stain were compared with those observed subsequent to Thiery''s reaction.

This publication has 1 reference indexed in Scilit: