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Histochemical sequential staining techniques, PAS, alcian blue pH 2.5 and pH 0.4, were applied to sections from the proventriculus of ducks to observe the histochemical properties of epithelial mucosubstances in the proventriculus of mallard and white Pekin ducks. The whole proventriculus obtained were divided systemically cross strips and processed routinely for histologic and histochemical study. Base on the histologic characteristics, we designated as upper portion which is the distal region of the esophageal-proventriculus junction, as middle portion, and as lower portion which is the proximal region of the proventricular-isthmus junction. The results obtained are as follows 1. Generally in the surface and foveolar epithelia showed the presence of the mixture of neutral and acid mucosubstances. 2. In the tubular gland showed the acidic nonsulfated and sulfated mucosubstance in addition to neutral mucosubstances with occasional neutral and acidic nonsulfated mucosubstances. 3. In the compound gland neutral mucosubstance with scant amounts of acidic mucosubstances or with lack of it were demonstrated. 4. There were recognized differences between speies in the staining intensity of all three types of mucosubstances. 5. There were recognized topographic difference in the acidity of epithelial mucosubstances according to portion.
This-experiment was performed in order to observe the effect of gulcocorticoid on the mucosubstances in the large intestine of mice. Adult mice were divided into control and hormone-treated group was daily injected intramuscularly with a dose of 100ug or 500 ug of dexamethasone disodium phosphate for 5 to 14 days and then were sacrificed under ether anesthesia on the 5th, 7th, 9th and 14th day after the injection. Specimens were collected from the cecum, the proximal protion of colon and the distal portion of colon and fixed in neutral buffered formalin. Paraffin sections were cut serially at 5 or 61um. Sections from each series were stained with hematoxylin and eosin, periodic acid-Schiff(PAS) reaction with counterstain, alcian blue pH 2. 5 with counferstain, alcian blue pH 1.0 without counterstain and aldehyde fuchsin pH 1.7-alcian blue pH 2.5 so as to demonstrate mucosubstances, respectively. The histochemical changes of the mucosubstances in the large intestine were observed with light miroscope. In the control grup, generally acid mucosubstances were more predominent throughout the large intestine than neutral one, but sulfated acid mucosubstances were predominent in the cecum and distal colon and nonsulfated acid mucosubstances were prominent in the lower crypt of proximal colon. In the dexamethasone treated group, from 7th day after the injection of a dose of 100 ug the decrease of mucosubstances in the cecum was appeared and these findings were remarkable on proportion to the duration of treatment and dose. During these duration, the decrease of blue-purple or purple were more remarkable. The similar findings were also found in the proximal and distal colon and generally the decree of sulfated acid mucosubstances were the prominent type seen.