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5 December, 20:56

What is the concentration of a suspension that grew 27 colonies on a plate made with 0.1ml from a culture with a dilution of 1:10,000?

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  1. 5 December, 23:46
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    2700000 CFU/ml

    Explanation:

    Dilution is of 1:10000 so if 27 colonies were observed:

    27 * 10000 = 270000 CFU or colony forming units are present

    But 0.1 ml of culture has been used so:

    CFU/ml would be 270000 * 10 = 2700000 CFU/ml

    Hence concentration of suspension is 2700000 CFU/ml
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