Phases Bacterial growth

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bacterial growth curve\kinetic curve


in autecological studies, growth of bacteria (or other microorganisms, protozoa, microalgae or yeasts) in batch culture can modeled 4 different phases: lag phase (a), log phase or exponential phase (b), stationary phase (c), , death phase (d).



this basic batch culture growth model draws out , emphasizes aspects of bacterial growth may differ growth of macrofauna. emphasizes clonality, asexual binary division, short development time relative replication itself, seemingly low death rate, need move dormant state reproductive state or condition media, , finally, tendency of lab adapted strains exhaust nutrients. in reality, in batch culture, 4 phases not defined. cells not reproduce in synchrony without explicit , continual prompting (as in experiments stalked bacteria ) , exponential phase growth not ever constant rate, instead decaying rate, constant stochastic response pressures both reproduce , go dormant in face of declining nutrient concentrations , increasing waste concentrations.


near end of logarithmic phase of batch culture, competence natural genetic transformation may induced, in bacillus subtilis , in other bacteria. natural genetic transformation form of dna transfer appears adaptation repairing dna damages.


batch culture common laboratory growth method in bacterial growth studied, 1 of many. ideally spatially unstructured , temporally structured. bacterial culture incubated in closed vessel single batch of medium. in experimental regimes, of bacterial culture periodically removed , added fresh sterile medium. in extreme case, leads continual renewal of nutrients. chemostat, known continuous culture. ideally spatially unstructured , temporally unstructured, in steady state defined rates of nutrient supply , bacterial growth. in comparison batch culture, bacteria maintained in exponential growth phase, , growth rate of bacteria known. related devices include turbidostats , auxostats. when escherichia coli growing doubling time of 16 hours in chemostat cells have single chromosome.


bacterial growth can suppressed bacteriostats, without killing bacteria. in synecological, true-to-nature situation in more 1 bacterial species present, growth of microbes more dynamic , continual.


liquid not laboratory environment bacterial growth. spatially structured environments such biofilms or agar surfaces present additional complex growth models.








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