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9 June, 10:16

A 1 ml sample of culture liquid contained 1000 viable bacterial cells. You serially diluted it twice, performing 10-fold or 1/10 dilutions into a final volume of 1 ml each time. As a result you have three tubes with 100, 10-1, or 10-2 of diluted culture. How many total cells are in the 1 ml of your 10-2 dilution tube?

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  1. 9 June, 11:46
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    there are 10 viable bacterial cells in 1 ml in the 1/100 dilution tube

    Explanation:

    in 1ml there is 1000 viable bacterial cells → diluted with 9 ml of solvent (10 ml in total) → 1000 viable bacterial cells in 10 ml (fist tube)

    now we take 1 ml of the first tube into the second empty tube → has 1000/10 = 100 viable bacterial cells on 1 ml → diluted with 9 ml of solvent (10 ml in total) → 100 viable bacterial cells in 10 ml (second tube)

    then we take 1 ml of the second tube into the third empty tube → has 100/10 = 10 viable bacterial cells in 1 ml → diluted with 9 ml of solvent (10 ml in total) → 10 viable bacterial cells in 10 ml (third tube)

    therefore there are 10 viable bacterial cells in 1 ml in the 1/100 dilution tube
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