00:01
In this part, we have given the normal growth curve for a mesophilic organism, and we have also the bacterial sample, which has 4 degrees celsius in refrigeration temperature.
00:15
So in this part, always remember that a bacterial culture, when inoculated in a broth culture, definitely the growth, the growth of bacterial population shows a classical a classical pattern and when it is plotted so when it is plotted on a graph there is a distinct distinct s shape as shape curve is obtained there are four phases in a growth curve first one is we have the lag phase so always remember that lag phase, the bacteria become acclimatized in the medium and triggers various enzymes and try to adjust with the environment.
01:22
During this phase, the cells are metabolically active but no appreciable increase in number.
01:29
Second, we have also log phase.
01:31
It is characterized as a rapid, rapid exponential phase, where the cells doubles at every generation and the maximum growth is seen and the organism are sensitive to antimicrobial agents.
01:51
We have also stationary phase.
01:54
The growth of the bacteria is almost stopped.
01:58
It's almost stopped in this phase.
02:02
Due to lack of essential nutrients and accumulation of the toxic material of their own self.
02:09
In this phase, the death rate exceed the rate of multiplication...