The Stationary Phase

This phase is one of equilibrium. The growth rate slows, the number of dead microorganisms equals the number of new microorganisms, and the population stabilizes. The metabolic activities of individual cells that survive will slow down. The reasons why the growth of the organisms stops is possibly that the nutrients have been used up, waste products have accumulated, and drastic harmful changes in the pH of the organisms environment have occurred.

There is a device called a chemostat that drains off old, used medium and adds fresh medium. In this way a population can be kept in the growth phase indefinitely.

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