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indicator medium

   Also found in: Dictionary/thesaurus, Medical, Legal, Wikipedia 0.01 sec.
indicator medium [′in·də‚kād·ər ‚mē·dē·əm]
(microbiology)
A usually solid culture medium containing substances capable of undergoing a color change in the vicinity of a colony which has effected a particular chemical change, such as fermenting a certain sugar.


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A sterile swab is provided along with a tube prefilled with an indicator medium that is designed to fluoresce when viewed under UV light if contamination by E.
The procedure for testing is simple: Swab the predetermined test area then place the swab in the tube containing indicator medium.
 
 
 
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