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Protistologica 1966; 11:5-52 11. Verni F. Rosati G. Preliminary survey of the morphology and cytochemistry of polysaccharides reserve in Ciliates. Protistologica 1980; 15: 427-434. 12. Rosati G. Enzyme treatments of glycogen particles in rat liver and muscle. J Ultratruc Res 1967; 18:444-455. 13. E. Histochemistry. Theoretical and Applied. d Vol 1. 3rd ed J & A Churchill, 1968.
The length and nature of the fixation procedures, the embedding medium, the thickness of the ultrathin sections can all influence or even prevent the extraction of a particular cellular component. Therefore a negative result should not be considered an absolute answer. Moreover, in specimens preparation, there are uncontrollable factors. For example, the sensitivity of a cellular component to the fixatives does not only depend by its intrinsic nature but also by its accessibility within the cellular context, by its chemical links with other cellular components and by other physic-chemical factors that vary from cell to cell.
The latter enzyme is thought to act on the proteic substrate to which paraglycogen is linked in the cytoplasm. The polysaccharide, once released, became soluble in the aqueous treatment medium. The results dealing Gastrostyla are shown in figure 2. Figure. 2. Micrographs from Gastrostyla: a. after oxidation alone paraglycogen granules (Pg) appear not affected while lipid droplets (L) are extracted. b. After oxidation Pg granules are still selectively stained by TSC-silver poroteinate c. Section oxidized and treated with diastase: Pg granules are extracted.