BactGrowth121_OLS

BactGrowth121_OLS - Dynamics of Bacterial Growth Binary...

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Dynamics of Bacterial Growth Binary Fission: 1 bacterium 2 bacteria Generation time = Time required for the number of bacteria in a population to double A. E. coli under perfect conditions doubles every 20 minutes! B. Huge numbers of bacteria can be reached in a short time Example: 100 S. aureus bacteria enter a wound. If S. aureus has a generation time of 60 minutes at body temp., how many bacteria will be in the wound after 10 hours? T=0 100 bacteria T=7 12,800 T=1 200 T=8 25,600 T=2 400 T=9 51,200 T=3 800 T=10 102,400 T=4 1600 T=11 204,800 T=5 3200 T=12 409,600 T=6 6400 T=24 1,677,721,600 Generation time varies with: 1. Species 2. Environmental conditions 3. Nutritional conditions Bacterial Growth Curve 1. Lag Phase A. Little or no increase in number of live cells B. Lots of metabolic activity/Making enzymes to prepare for rapid growth C. Length of lag phase varies by species 1
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2. Log Phase A. Exponential growth: Number of live cells doubles in a given time period (rate varies by
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This note was uploaded on 02/13/2012 for the course MBI 121 taught by Professor Balish during the Fall '08 term at Miami University.

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BactGrowth121_OLS - Dynamics of Bacterial Growth Binary...

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