Microbiology Procedure
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Index >> Growth of Microorganism >> Death Phase in Growth of Microorganism

Death Phase in Growth of Microorganism

Death Phase in Growth of Microorganism- In this phase the cells begin to die and as a result there is an increasing divergence between the total and viable counts. However, when death occurs, autolysis takes place i.e. cells begin to digest themselves. Such autolysis has interesting results.

If a laboratory culture is allowed to enter into the death phase, so that major proportion of cells lyse, those remaining may be able to grow on the products of this lysis. In other words, cannibalism occurs.

This short growth phase is followed by a further death phase and the process is repeated until no cells remain. In this way a culture may remain viable for a very long time, although it should be noted that we are eventually selecting those organisms in a culture that lyse readily or are the best cannibals.

In evolution, microbes have had to compromise between the requirement for maximal growth rates and an ability to adapt rapidly to the environment with a concomitant maximal ability to survive after the onset of the stationary phase.

An excellent method of prolonging the stationary phase is to porsulate and to produce a cell specialised for the  minimal rate of destruction in an environment inimicable to cell growth.

 

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