Penicillin is produced by P. chrysogenum in a fed-batch culture with the intermittent addition of glucose solution to the culture medium. The initial culture volume at quasi-steady state is V0 = 500 l, and glucose-containing nutrient solution is added with a flow rate of F = 50 l/h. Glucose concentration in the feed solution and initial cell concentration are S0 = 300 g/l and X0 = 20 g/l, respectively. The kinetic and yield coefficients of the organism are mm = 0.2 h-1 , KS = 0.5 g/l, and YX/S = 0.3 g dw/g glucose. Determine the concentration of cells at quasi-steady state when t = 10 h.

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#Question id: 1600

#Section 2: General Biology

What is the name of MHC in humans?

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#Question id: 2069

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following processes includes all of the others?

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#Question id: 5840

#Section 3: Genetics, Cellular and Molecular Biology

The sequence of proteins used in bacterial recombination is

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#Question id: 4554

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

In which studies have shown that phosphorylated NtrC bound at enhancers and σ54-polymerase bound at the promoter interact directly, forming a loop in the DNA between the binding sites?

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#Question id: 27198

#Section 5: Bioprocess Engineering and Process Biotechnology

If the half life of a first order reaction in A is 2 min, how long will it take A to reach 

(a) 25 percent of its initial concentration