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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. The initial phase is the lag phase where bacteria are metabolically active but not dividing. The exponential or log phase is a time of ...
- Regina Bailey
- 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.
Mar 28, 2024 · The bacterial growth curve is a graphical representation of the different phases of bacterial growth over time, including the lag phase, log phase, stationary phase, and death phase. Bacterial Growth Curve
Aug 31, 2023 · 3. The stationary growth phase. Here the population grows slowly or stops growing (see Figure 17.1.3 17.1. 3) because of decreasing food, increasing waste, and lack of space. The rate of replication is balanced out by the rate of inhibition or death. 4. The decline or death phase.
- Stages of the Bacterial Growth Curve. Knowing the difference between the lag, log, stationary, and death phases of a cell growth curve may sound like biology basics but applying that knowledge in active cell culture is a sign of a more fundamental understanding of microbiological processes.
- Lag Phase. This initial cell growth phase is generally characterized by metabolic activity but not growth. The cells utilize media to synthesize the small molecules necessary for replication.
- Log (Exponential Growth) Phase. Once cells enter the exponential growth or log phase, it’s all about the numbers. This is when cells divide by binary fission and the doubling of each generation creates the exponential growth for which the phase is named.
- 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.
Bacterial growth curve\Kinetic Curve. In autecological studies, the growth of bacteria (or other microorganisms, as protozoa, microalgae or yeasts) in batch culture can be modeled with four different phases: lag phase (A), log phase or exponential phase (B), stationary phase (C), and death phase (D). [3]
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It has been determined that in a closed system or batch culture (no food added, no wastes removed) bacteria will grow in a predictable pattern, resulting in a growth curve composed of four distinct phases of growth: the lag phase, the exponential or log phase, the stationary phase, and the death or decline phase. Additionally, this growth curve can yield generation time for a particular ...
