Bacterial Growth Curve


Definition: When a graph plotted between the growth of bacteria and time page is called growth curve.


Phases of bacterial growth curve--
Bacterial growth curve has four distinct phases 
Lag phase
Log phase
Stationary phase
Decline phase

Lag Phase:

In this phase there are no growth of bacteria, because culture media is just prepared, so up to 2 to 3 hours there are no growth of bacteria, only nutrition medium present.

During that time, necessary enzymes and intermediate metabolites are synthesized and before multiplication the bacterium reaches a critical stage and finally multiplication takes place at this stage. Hence, this stage is also known as initial stage or dormant stage.


Log Phase:

In this phase, there are maximum growth of bacteria because after the germination of bacteria they reproduce in fast rate and bacteria increases. And there are nutrition is more than  the bacteria, so bacteria grow maximum.

-- Also called as Exponential phase.

                                 

Stationary Phase:

In this phase, growth of bacteria stops. And it may be stationary, because number of birth of bacteria is equal to number of death of bacteria.

-- It just happened due to lack of nutrition medium.


Decline Phase:

Also known as death phase.

In this phase bacteria start dying, because number of bacteria is more than nutrition medium. 

-- So, due to lack of nutrition bacteria start dying.




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