Fermentation Reactors Questions

• A fed-batch reactor containing 2 litre of medium and 0.1 g.l-l of biomass is fed with a medium containing 1 g.l-1 of substrate at 1 litre per hour. If after 10 hours, the concentration of biomass in the reactor was 0.2 g.l-1, then the biomass produced during the 10 hour period is
• A strain of Escherichia coli has a maximum specific growth rate of 0.8 h-1 on a glucose based medium. If this organism is being grown in a chemostat with a dilution rate of 1.2 h-1, then at steady state the concentration of E. coli in the same medium will
• Which of the following is best described as secondary metabolite?
• When the product formation is approximately equal to the rate of cell growth, the pattern of product formation is termed as
• Which of the following would be correct concerning the concentration of biomass (X). growth limiting substrate (S) and product (P) in a chemostat when the cells have been washed out?
• The fastest route of NADH reoxidation is
• The concentration of biomass in a continuous stirred tank reactor is 20 g dry weight per litre. What would be the concentration of biomass in the effluent?
• In plug flow tubular reactor the axial velocity profile on cross-section will be
• The ideal tubular-flow fermenter without radial variations is called a
• When Escherichia coli grow in a well aerated medium, which of the following will occur?
• Pseudomonas aeruginosa has a maximum specific growth rate of 0.8 h-1 in a medium with glucose as a growth limiting substrate. To prevent wash out, the dilution rate must be set to
• Which of the following organisms will continue their metabolism at high substrate concentrations?
• In the batch-fed mode, substrate will be added
• Pseudo-steady state in a continuous reactor refers to a reactor in which
• In a plug flow reactor, the highest concentration of substrates is exposed to the cells that
• In fed batch bioreactor modelling, the rate of change in the bioreactor volume is assumed to be equal to
• Which of the following is not correct with regards to continuous cultures?
• Two continuous bioreactors containing the same organisms, fed with the same feed at the same dilution rate were compared. Reactor 1 started with an initial concentration of glucose of 10 g.l-1, while reactor 2 contained 0.1 g.l-1 of glucose at the start of the process then at steady state
• In a glucose-yeast extract medium, Lactococcus lactis has a maximum specific growth rate (um) of 1.23 h-1. What would be the specific growth rate of this organism at steady state in a 4 litre reactor being fed at 2 litres per hour?
• The toxicity of organic acids to cells