E. coli have a maximum respiration rate, qO2max, of about 240-mg O2/g-dry wt-h. It is desired to achieve a cell mass of 20 g dry wt/l. The kLa is 120 h-1 in a 1000-l reactor (800 l working volume). A gas stream enriched in oxygen is used (i.e., 80% O2) which gives a value of C* = 28 mg/L. If oxygen becomes limiting, growth and respiration slow; for example,

                                     

   where CL is the dissolved oxygen concentration in the fermenter. What is CL when the cell mass is  at 20 g/l?

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#Question id: 14418

#Section 5: Bioprocess Engineering and Process Biotechnology

It is required to provide a 20-m^3 fermenter with air at a rate of 10 m^3 min ^-I for a fermentation lasting 100 hours. From an investigation of the filter material to be used, the optimum linear air velocity was shown to be 0.15 m sec^-I, at which the value of K was 1.535 cm^-I. calculate The dimensions (radius and depth) of the filter? The air in the fermentation plant contained approximately 200 micro-organisms m^-3. The acceptable degree of contamination is one in a thousand.

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#Question id: 14149

#Section 7: Recombinant DNA technology and Other Tools in Biotechnology

Which of the following program is not an example of local alignment?

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#Question id: 2060

#Section 2: General Biology

An animal cell lacking carbohydrates on the external surface of its plasma membrane would likely be impaired in which function?

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#Question id: 20597

#Section 5: Bioprocess Engineering and Process Biotechnology

Which one of the following controllers improves steady state error and also stability of the system?

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#Question id: 2059

#Section 2: General Biology

For a protein to be an integral membrane protein, it would have to be: