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No overall population growth
- Bacterial cell growth reaches a plateau, or stationary phase, where the number of dividing cells equals the number of dying cells. This results in no overall population growth. Under the less favorable conditions, competition for nutrients increases, and the cells become less metabolically active.
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Jun 4, 2024 · The bacterial growth curve represents the number of live cells in a bacterial population over a period of time. There are four distinct phases of the growth curve: lag, exponential (log), stationary, and death.
- Regina Bailey
Aug 31, 2023 · In a closed growth system, a bacterial population usually exhibits a predictable pattern of growth - its growth curve - that follows several stages or phases. During the lag phase growth is relatively flat and the population appears either not to be growing or growing quite slowly as newly inoculated cells are adapt to their new environment.
Feb 17, 2021 · When a bacterial count of such culture is determined at different intervals and plotted in relation to time, a bacterial growth curve is obtained. It comprises four phases: lag phase, exponential, stationary and death phase. We will discuss each phase in detail in this article.
If incubation continues after the population reaches stationary phase, a death phase follows, in which the viable cell population declines. During the death phase, the number of viable cells decreases geometrically (exponentially), essentially the reverse of growth during the log phase.
Oct 25, 2024 · Upon inoculation into the new medium, bacteria do not immediately reproduce, and the population size remains constant. During this period, called the lag phase , the cells are metabolically active and increase only in cell size.
The number of new bacteria appearing per unit time is proportional to the present population. If growth is not limited, doubling will continue at a constant rate so both the number of cells and the rate of population increase doubles with each consecutive time period.
Feb 20, 2024 · Decline or Death Phase: The denouement marked by a decline in viable cell numbers owing to adverse conditions, nutrient exhaustion, or toxin accumulation. The population faces an inevitable decline unless conducive conditions are reinstated.
