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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]
This can occur during periods of stress, [1] randomly in order to allocate "designated survivors" in a population, [1] or when bacteria cease growth (enter stationary phase). [2]
The growth rate of the microorganism is controlled by manipulation of the inflow of fresh medium, while the population density is regulated through changing the concentration of the limiting nutrient. This open system allows researchers to maintain the exponential growth phase of cells for use in physiological experiments. [1]
Stationary phase may refer to Stationary phase (biology), a phase in bacterial growth; Stationary phase (chemistry), a medium used in chromatography;
Brachybacterium is a genus of Gram positive, nonmotile bacteria.The cells are coccoid during the stationary phase, and irregular rods during the exponential phase. The genus name comes from Greek word brachy, meaning short, and Latin bacterium, meaning rods, referencing the short rods noted during the exponential phase.
The first phase is the fast growth phase, since the bacterium is consuming (in the case of the above example) exclusively glucose, and is capable of rapid growth. The second phase is a lag phase while the genes used in lactose metabolism are expressed and observable cell growth stops. This is followed by another growth phase which is slower ...
Bacterial growth is limited by factors including nutrient availability and available space, so binary fission occurs at much lower rates in bacterial cultures once they enter the stationary phase of growth.
Run-and-tumble motion is a movement pattern exhibited by certain bacteria and other microscopic agents. It consists of an alternating sequence of "runs" and "tumbles": during a run, the agent propels itself in a fixed (or slowly varying) direction, and during a tumble, it remains stationary while it reorients itself in preparation for the next run.