Synchronous and Diauxic Growth of Bacteria / Microbiology notes / Dr. Blessy / Tamil

Synchronous growth of a bacterial population is that during which all bacterial cells of the population are physiologically identical and in the same stage of cell division cycle at a given time.In most of the bacterial cultures, the stages of growth and cell division cycle are completely random and thus it becomes difficult to understand the properties during the course of division cycle using such cultures. To overcome this problem, the microbiologists have developed synchronous culture techniques to find synchronous growth of bacterial population. Synchronous growth helps studying particular stages or the cell division cycle and their interrelations.
When a bacterium is incubated in a medium containing two sugars one monosaccharide and another di or polysaccharide (like glucose and lactose). The bacteria first utilize glucose and complete their lag and log phase. After completion of glucose utilization, they use lactose and produce and another lag phase due to the synthesis of their lactose breaking enzyme. Such types of growth have two lag phases called diauxic growth and the curve is called a diauxic curve.
In this video, synchronous and diauxic growth of bacteria are clearly explained in detail.
To watch the video on growth curve, click the link below:
• Bacterial Growth Curve...

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