Pas Postive Reaction....

[missiondds]

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Constituent of epithelial cells or tissues that gives a positive PAS reaction:
A. Cilia
B. Nuclei
C. Nucleoli
D. Brush Borders

please what does PAS reaction mean?????
and hope that you explain when you answer.
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PAS reaction is postive for cells/cell component that have a carbohydrate/sugar moiety in thm. pas reaction is postive for cewll memberanes that have high glycoprotein conten or GAG/GLYCOLIPID CONTENT.. so among the following options its only brush broder that has a high mucin/mucous content WHICH IS HIGH IN CARBOHYDRATE MOIETY... HENCE GIVES A POSTIVE PAS REACTION.

 

[Sinatra Frank]

Constituent of epithelial cells or tissues that gives a positive PAS reaction:
A. Cilia
B. Nuclei
C. Nucleoli
D. Brush Borders

please what does PAS reaction mean?????
and hope that you explain when you answer.
Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xx]

u r right but it also stains nucleus,, go to histology term in wikipedua and check the table..

 

[missiondds]

I checked out the cloumn u mentioned...

it IS SIMPLY MENTIONED THAT PAS STAINING WOULD GIVE A BLUE COLOR TO NUCLEUS.WHEREAS THE PAS REACTION IS POSTIVE WHEN IT PRODUCES A CHARACTERISTIC MAGENTA STAIN.

http://en.wikipedia.org/wiki/Periodic_acid-Schiff_stain

ALSO THE CLOUMN CLEARLY MENTIONS THAT SPECIALTY OF PAS STAINING IS GLU/GLYCOGEN.. WHICH GIVE MAGENTA.. WHILE STUFF LIKE NUCLEI WOULD GIVE BLUE.


CORRECT ME IF I AM WRONG.