periodic acid-Schiff

Also found in: Acronyms.

per·i·od·ic acid-Schiff

adj. Abbr. PAS
Of, relating to, or being a reaction that tests for polysaccharides and related substances through the treatment of tissue sections with periodic acid stain and Schiff's reagent.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
References in periodicals archive ?
Periodic acid-Schiff stain shows yeast of uniform size with a thick cell wall and clear cytoplasm (original magnification x40).
Periodic acid-Schiff stain can highlight intracellular or extracellular eosinophilic globules (original magnification X100).
Table 1: Toenail specimens sent for periodic acid-Schiff (PAS) staining by dermatologists, podiatrists, and other physicians.
(d) Alcian blue and periodic acid-Schiff stain of the specimen, demonstrating abundant glycogen in the cytoplasm.
Periodic acid-Schiff test, done on only selected patients, was mostly negative.
Most focussed on older adult samples reflecting the fact that onychomycosis is a disease are more prevalent in this age group [40] however, definitive diagnosis for in- clusion relied on a single test result in some studies [25-29,31,32] or a combination of tests such as Periodic Acid-Schiff (PAS) stain, microscopy, positive fungal culture or polymerase Chain Reaction (PCR) in others [30,33,35,36,41].
Class III fish tissues were stained with periodic acid-Schiff (PAS), Alcian blue (AB) at pH 2.5 (AB pH 2.5) and the sequential combination of both stains (AB pH 2.5/PAS) to identify neutral and acidic mucosubstances of the gastrointestinal tract.
Other special stains done routinely include Gomori methenamine silver (GMS), Periodic acid-Schiff (PAS), Gridley's method, Mucicarmine and Masson-Fontana (for pigmented fungi).
Portions of liver were fixed in 10% neutral buffered formalin, embedded in paraffin, sectioned for light microscopy, and stained with hematoxylin and eosin, Ziehl-Neelsen acid fast, and the periodic acid-Schiff (PAS) stain.
Biopsy of the rectal nodule revealed a granular cell tumor with positive periodic acid-Schiff (PAS) staining (Figure 2).
Abbreviations CMV: Cytomegalovirus CNS: Central nervous system CP: Cortical plate, cerebral Hb: Hemoglobin HE: Hematoxylin-Eosin (staining) HF: Hydrops fetalis LSD: Lysosomal storage diseases MPS: Mucopolysaccharidosis NIHF: Nonimmune hydrops fetalis PAS: Periodic Acid-Schiff (staining) PAS-D: Periodic Acid-Schiff-diastase/amylase (staining) PCR: Polymerase chain reaction PG: Polyglucosans PGB: Polyglucosan bodies PGBD: Polyglucosan Body Disease(s)/Polyglucosan Body Disorder(s) APGBD: Adult Polyglucosan Body Disease WM: White matter, cerebral.
In this study, we confirmed the typical pathological changes, including endothelial cell injury, pericyte apoptosis, capillary hemangioma, and vascular caliber tortuousness, in the DR of diabetic rats via retinal digests stained by periodic acid-Schiff. Hemorheological changes damaged the vessel cell walls.

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