Question:
Write the significance of using a turbidostat and a chemostat in continuous culture system.
Write the significance of using a turbidostat and a chemostat in continuous culture system.
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Chemostats are ideal for studying cell physiology under nutrient limitation, while turbidostats are preferred for selecting mutant strains with high growth rates or studying cell growth near maximum speeds ($\mu_{\max}$).
Updated On: Jun 19, 2026
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Solution and Explanation
Step 1: Concept of Continuous Culture
A continuous culture is an open system where fresh nutrient medium is added continuously, and an equal volume of spent culture liquid containing cells and products is siphoned out at the same rate, maintaining a constant volume and a steady-state growth rate.
Step 2: Significance of a Chemostat
1. Control of Growth Rate: In a chemostat, the growth rate of the cells is controlled by adjusting the concentration of a single limiting nutrient (such as carbon, nitrogen, or phosphorus) in the incoming feed.
2. Steady State: The rate of cell growth is determined by the dilution rate (flow rate divided by fermenter volume). By matching the dilution rate to the cells' specific growth rate, the system maintains a stable, steady-state concentration of cells and nutrients over long periods.
Step 3: Significance of a Turbidostat
1. Control of Cell Density: In a turbidostat, the system is designed to keep the cell concentration (turbidity) constant.
2. Feedback Control: A photoelectric sensor (spectrophotometer) continuously measures the turbidity of the culture. If the cell density exceeds a set point, the system automatically pumps in fresh medium to dilute the culture, siphoning out an equal volume.
3. No Limiting Nutrient: Unlike the chemostat, the turbidostat operates without a limiting nutrient, allowing cells to grow continuously at their maximum growth rate ($\mu_{\max}$).
Final Answer: A chemostat controls growth rate by adjusting the concentration of a limiting nutrient in the feed at a set flow rate. A turbidostat uses a photoelectric sensor to keep cell concentration constant, diluting the culture with fresh medium whenever the turbidity exceeds a set threshold.
A continuous culture is an open system where fresh nutrient medium is added continuously, and an equal volume of spent culture liquid containing cells and products is siphoned out at the same rate, maintaining a constant volume and a steady-state growth rate.
Step 2: Significance of a Chemostat
1. Control of Growth Rate: In a chemostat, the growth rate of the cells is controlled by adjusting the concentration of a single limiting nutrient (such as carbon, nitrogen, or phosphorus) in the incoming feed.
2. Steady State: The rate of cell growth is determined by the dilution rate (flow rate divided by fermenter volume). By matching the dilution rate to the cells' specific growth rate, the system maintains a stable, steady-state concentration of cells and nutrients over long periods.
Step 3: Significance of a Turbidostat
1. Control of Cell Density: In a turbidostat, the system is designed to keep the cell concentration (turbidity) constant.
2. Feedback Control: A photoelectric sensor (spectrophotometer) continuously measures the turbidity of the culture. If the cell density exceeds a set point, the system automatically pumps in fresh medium to dilute the culture, siphoning out an equal volume.
3. No Limiting Nutrient: Unlike the chemostat, the turbidostat operates without a limiting nutrient, allowing cells to grow continuously at their maximum growth rate ($\mu_{\max}$).
Final Answer: A chemostat controls growth rate by adjusting the concentration of a limiting nutrient in the feed at a set flow rate. A turbidostat uses a photoelectric sensor to keep cell concentration constant, diluting the culture with fresh medium whenever the turbidity exceeds a set threshold.
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