detect secretions on plates

Nivram marvin at
Tue May 17 15:48:40 EST 1994

can anyone tell me if there is a way to detect proteins secreted by 
bacterial colonies growing on agar without killing the colonies ? i am 
looking for ways which do not use radioactive labelling, antibodies 
precipitation etc... just simple ones.  Is there an indicator which 
changes colour when it comes in contact with proteins ?


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