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Explain what you understand by the ‘doubling time’ of microorganisms. Give examples.

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Solution

Doubling time in microbiology refers to the period it takes for a population of microorganisms to double in number. It is a measure of growth rate and is particularly important in understanding the spread of bacteria or other microorganisms in a host or environment.

Here's a step-by-step explanation:

  1. Start with a certain number of microorganisms. For example, let's say we have 100 bacteria.

  2. These microorganisms reproduce by dividing into two. This is called binary fission in bacteria.

  3. The time it takes for the population to double from 100 to 200 bacteria is the doubling time.

  4. This time can vary greatly depending on the species of microorganism and the conditions in which they are growing. For example, under optimal conditions, E. coli bacteria can have a doubling time of about 20 minutes, while the tuberculosis bacterium might have a doubling time of 24 hours.

  5. Doubling time is an important concept in microbiology because it helps scientists understand how quickly a bacterial infection could spread in a host or how quickly a beneficial bacterial population could colonize a new environment.

  6. It's also used in the field of environmental microbiology to estimate the biodegradation or bioremediation potential of certain microorganisms. For instance, microorganisms with a short doubling time might be more effective at breaking down pollutants in a contaminated environment.

  7. In the medical field, understanding the doubling time of a pathogenic microorganism can help in determining the severity of an infection and in planning the appropriate treatment strategy.

  8. It's important to note that the doubling time is an average measure. Not all cells in a population will divide at the same time, and environmental factors can influence the rate of division.

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