Bioprocess Engineering and Process Biotechnology MCQs

In a fed-batch culture, 200 g L-1 glucose solution is added at a flow rate of 50 L h-1. The initial culture volume (at quasi steady state) and the initial cell concentration are 600 L and 20 g L-1, respectively. The yield coefficient \[\left( {{Y_{\frac{X}{S}}}} \right)\] is 0.5 g cell mass-g substrate-1. The cell concentration (g L-1) at quasi steady state at t = 8 h is

The following crosslinking agents may be used for the immobilization of enzymes.

Thermal death of microorganisms in the liquid medium follows first order kinetics. If the initial cell concentration in the fermentation medium is 108 cells mL-1 and the final acceptable contamination level is 10-3 cells, for how long should 1 m3 medium be treated at temperature of 120°C (thermal deactivation rate constant = 0.23 min-1) to achieve acceptable load?

Match separation methods in Group I with associated properties in Group II. Group I Group II P. Centrifugation 1. Density Q. Dialysis 2. Diffusivity R. Solvent extraction 3. Size S. Ultrafiltration 4. Solubility

In dead-end filtration, rate of filtration is

Which one of the following statements is correct about proportional controllers?

A batch culture fermentation was being conducted with Streptomyces rimosus, Analysis of samples collected indicated doubling of cell number per unit time. Your interference would be that the culture is in the

In an exponentially growing batch culture of Saccharomyces cerevisiae, the cell density is 20 g L-1 (DCW), the specific growth rate (μ) is 0.4 h-1 and substrate uptake rate (v) is 16 g L-1 h-1. The cell yield coefficient \[{Y_{\frac{X}{S}}}\] will be

The separation principle of dialysis used in the recovery of fermentation products is