I am using disc diffusion method for antibiotic susceptibility testing for plant extract.Will you please tell me the method for preparing the disc preparation method for plant extract.How tocalculte that i am not understanding? Results are not coming properly.So i have decided to change the concentrations. I have stock of 0.1 m mg/ml plant extract.i want to prepare four concentrations that is 25, 50 75 150 microgram in disc ?In how much microlitr should i prepare? and shall i increase concecntration of stock solution?please guide me.

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