Search results
Results from the WOW.Com Content Network
PAS diastase stain is also used to identify alpha-1 antitrypsin globules in hepatocytes, which is a characteristic finding of alpha-1 antitrypsin deficiency. [2] PAS diastase stain is also used in diagnosing Whipple’s disease, as the foamy macrophages that infiltrate the lamina propria of the small intestine in this disease possess PAS ...
The diastase negative slide will show a magenta staining where glycogen is present within a section of tissue. The slide that has been treated with diastase will lack any positive PAS staining in those locations on the slide PAS staining is also used for staining cellulose. One example would be looking for implanted medical devices composed of ...
PAS diastase showing the fungus Histoplasma. [13] Periodic acid-Schiff is a histology special stain used to mark carbohydrates (glycogen, glycoprotein, proteoglycans). PAS is commonly used on liver tissue where glycogen deposits are made which is done in efforts to distinguish different types of glycogen storage diseases.
Joseph Forde Anthony McManus, (July 13, 1911 – March 4, 1980) was a Canadian pathologist who is best known for his formulation of one of the most frequently used stains in histopathology; the McManus Periodic acid-Schiff stain. Joe McManus was a pioneer in the field of Histochemistry during its period of expanding growth and application in ...
Language links are at the top of the page across from the title.
A liver biopsy in such cases will reveal PAS-positive, diastase-resistant inclusions within hepatocytes. [9] Unlike glycogen and other mucins which are diastase sensitive (i.e., diastase treatment disables PAS staining), A1AT deficient hepatocytes will stain with PAS even after diastase treatment - a state thus referred to as "diastase resistant".
Characteristic biopsy findings show filling of the alveoli (and sometimes terminal bronchioles) with an amorphous eosinophilic material, which stains strongly positive on PAS stain and the PAS diastase stain. The surrounding alveoli and pulmonary interstitium remain relatively normal. [14]
According to the EU Honey Directive, [13] diastase activity is a composition criterion that must be determined for honeys intended for human consumption. The official analysis methods for the determination of diastase activity in honey are the Schade assay and Phadebas assays, recommended by the International Honey Commission. [14]