You dilute a natural sample 10-4, plate 100 microliters, and observe 200 colonies on the plate....
You dilute a natural sample 10-4, plate 100 microliters, and observe 200 colonies on the plate. what was the initial concentration, in units of cells/ml?
Homework Answers
100 microliters = 0.1 ml
Number of cells observed = 200
Dilution = 10-4
Initial concentration of cells = 200 x 1/10
= 200 / 10 = 20 cells/ml
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