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Log phase
- The log phase of bacterial growth is followed by the stationary phase, in which the size of a population of bacteria remains constant, even though some cells continue to divide and others begin to die. The stationary phase is followed by the death phase, in which the death of cells in the population exceeds the formation of new cells.
www.britannica.com/science/bacteria/Growth-of-bacterial-populationsBacteria - Reproduction, Nutrition, Environment | Britannica
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Jun 4, 2024 · There are four distinct phases of the growth curve: lag, exponential (log), stationary, and death. The initial phase is the lag phase where bacteria are metabolically active but not dividing. The exponential or log phase is a time of exponential growth.
- Regina Bailey
Mar 28, 2024 · Here are some key points about the stationary phase in bacterial growth: The stationary phase is the third phase of the bacterial growth curve, following the lag phase and the log/exponential phase. During the stationary phase, the growth rate of the bacterial population becomes nearly zero.
- Lag Phase: Lag phase represents a period of active growth during which bacteria prepare for reproduction, synthesizing DNA, various inducible enzymes, and other macromolecules needed for cell division.
- Log or Exponential Growth Phase: Bacterial cells prepared for cell division during lag phase now enter into the log phase or exponential growth phase during which the cells divide at a maximal rate and their generation time reaches a minimum and remains constant.
- Stationary Phase: Since the bacteria are growing in a constant volume of medium of batch culture, and no fresh nutrients are added, the growth of bacterial population eventually ceases and the growth curve becomes horizontal.
- Death or Decline Phase: After a while, the number of dying cells begins to exceed the number of new-born cells and thus the number of viable bacterial cells present in a batch culture starts declining.
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 · The stationary phase is followed by the death phase, in which the death of cells in the population exceeds the formation of new cells. The length of time before the onset of the death phase depends on the species and the medium.
Stationary Phase. As environmental conditions change and become the limiting factor in growth, cells slow reproduction and enter a stationary phase. In this stage cells are technically still reproducing but it is less than before and roughly equal to the amount of cell death.
Secondary metabolites, including antibiotics, are synthesized in the stationary phase. In certain pathogenic bacteria, the stationary phase is also associated with the expression of virulence factors, products that contribute to a microbe’s ability to survive, reproduce, and cause disease in a host organism.
