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# growth - starting and ending numbers of cells By dividing...

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WORKING WITH BACTERIAL GROWTH YIELDS AND GROWTH RATES OK, so the simple formula for calculating YIELDS is: N t =N 0 x 2 g where: N t is the number of cells at time t N 0 is the starting number of cells g is the number of generations that occurred t is the elapsed time If you know the doubling time (t/g), usually expressed as hours or minutes per generation, given a length of time t, you can simply calculate the number of generations that occur. Now, if you do an experiment and measure N 0 and N t (and of course you took note of the time), how do you calculate the DOUBLING TIME? First, you convert the above equation to give number of generations (g) based on the
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Unformatted text preview: starting and ending numbers of cells. By dividing both sides by N you get: N t /N =2 g Now if you were good at log 2 you could solve this easily - it would be log 2 (N t /N )=g, but most of us think in terms of log 10 , so you can either look in your old math book or take it from me that this translates into [log 10 (N t /N )]/log 10 2=g of course, you remember that the log 10 2=0.301, so the formula roughly becomes [log 10 (N t /N )]/0.3=g g/t is the growth rate, and t/g is the doubling time....
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