Colony Count Calculations

1 in 100 dilution (99 + 1 = 100) or. Dilution factor of 100 or. 10-2 dilution ( 1 ( 100 = 0.01 = 10-2) Colony information : 1/10 ml of the dilution was plated = 142 colonies grew. To calculate the CFU per 1/10 ml in the original sample: Multiply the no. of colonies by the dilution factor or. 142 x 100 = 14 200. colonies. Divide by the dilution ... ................
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