Which of the following would not be subjected to the "glucose effect"?
Options
A. Aspergillus fumigatus
B. Saccharomyces cerevisiae
C. Escherichia coli
D. Aspergillus niger
Correct Answer
Escherichia coli
Fermentation Reactors problems
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1. On a glucose medium, the growth of an organism is characterized by the following Monod model and stoichiometric parameters ?m = 0.3 h-1, Ks =0.05 g.l-1 and Yxs = 0.3 g.g-1 When this organism is grown in a 2 litre continuous on a medium containing 10 g.l-1 of glucose added at 1 l.h-1, the steady state concentration of biomass in the reactor will be
2. In a continuous reactor, the medium contains 40 g.l-1 of maltose and the medium flow rate is 10 litres per hour and the effluent contains 20 g.l-l of lactate. What is the productivity of lactate production from this reactor?
3. A continuous reactor at steady state contains 0.04 g.l-1 of biomass and 0.02 g.l-1 of phenol. The feed contained 0.1 g.l-1 of phenol. The biomass yield would be
4. A fed-batch reactor containing 1 g.l-1 of substrate in 2 litre of medium. It is fed with 1 g.l-l of substrate at the rate of 1 litre per hour. After 10 hours, the concentration of substrate in the reactor was 0.5 g.l-1 . The mass of substrate that was used by the culture in the reactor was
5. To measure the extent to which the reaction rate is lowered because of resistance to mass transfer, the effectiveness factor of an immobilized enzyme, ? can be defined as
Options
A. reaction rate/rate if not slowed by diffusion
B. rate if not slowed by diffusion/ reaction rate
C. actual reaction rate/ rate if not slowed by diffusion
D. rate if not slowed by diffusion/ actual reaction rate
Correct Answer: actual reaction rate/ rate if not slowed by diffusion
6. A culture system with constant environmental conditions maintained through continual provision of nutrient and removal of wastes is called __________ culture system.
10. The cellular productivity in a continuous stirred tank fermenter (CSTF) increases with an increase in the dilution rate and reaches a maximum value. If the dilution rate is increased beyond the maximum point, the productivity will