In a certain culture of bacteria the rate of increase is proportional to the number present. (i) if it is found that the number doubles in 4 hours, how many may be expected at th end of 12 hours. (ii) if there are 10 ^4 at the end of 3 hours and 4.10^4 at the end of 5 hours, how many were in the beginning.
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Growth of bacterial populations
See how pasteurization protects food and phagocytes protect the body from harmful bacteria
See how pasteurization protects food and phagocytes protect the body from harmful bacteria
Bacteria can be pathogenic (disease-causing) and may produce toxins that can spoil foods and cause food poisoning. Some diseases caused by bacteria include botulism, typhoid fever, and pneumonia.
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Growth of bacterial cultures is defined as an increase in the number of bacteria in a population rather than in the size of individual cells. The growth of a bacterial population occurs in a geometric or exponential manner: with each division cycle (generation), one cell gives rise to 2 cells, then 4 cells, then 8 cells, then 16, then 32, and so forth. The time required for the formation of a generation, the generation time (G), can be calculated from the following formula: