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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).
Figure 1: A bi-phasic bacterial growth curve.. A growth curve is an empirical model of the evolution of a quantity over time. Growth curves are widely used in biology for quantities such as population size or biomass (in population ecology and demography, for population growth analysis), individual body height or biomass (in physiology, for growth analysis of individuals).
As resources become more limited, the growth rate tapers off, and eventually, once growth rates are at the carrying capacity of the environment, the population size will taper off. [6] This S-shaped curve observed in logistic growth is a more accurate model than exponential growth for observing real-life population growth of organisms. [8]
The Gompertz curve or Gompertz function is a type of mathematical model for a time series, named after Benjamin Gompertz (1779–1865). It is a sigmoid function which describes growth as being slowest at the start and end of a given time period.
This open system allows researchers to maintain the exponential growth phase of cells for use in physiological experiments. [ 1 ] A chemostat (from chem ical environment is stat ic) is a bioreactor to which fresh medium is continuously added, while culture liquid containing left over nutrients, metabolic end products and microorganisms is ...
This would kill off most bacteria, but leave some alive. We can then smear the growth medium over a new growth medium, and count the number of colonies as the number of survivors. In the Lamarckian scenario, each bacterium faces the challenge alone. Most would perish, but a few would survive the ordeal and found a new colony.
Incubation follows a growth curve variable for every microorganism. Cultures follow a lag, log, stationary, and finally death phase. [ 6 ] The lag phase is not well known in microbiology, but it is speculated that this phase consists of the microorganism adjusting to its environment by synthesizing proteins specific for the surrounding habitat ...
When an empirical equation of this form is applied to microbial growth, it is sometimes called a Monod equation. Michaelis–Menten kinetics have also been applied to a variety of topics outside of biochemical reactions, [ 14 ] including alveolar clearance of dusts, [ 19 ] the richness of species pools, [ 20 ] clearance of blood alcohol , [ 21 ...