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Recent questions tagged bioprocess

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1
At the end of a batch culture, glucose solution is added at a flow rate of $200 \: ml/h$. If the culture volume after $2$ h of glucose addition is $1000$ ml, the initial culture volume (in ml) is _________
asked Feb 20, 2018 in Bioprocess Engineering and Process Biotechnology gatecse 1.4k points
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2
Moist heat sterilization of spores at $121 ^\circ C$ follows first order kinetics as per the expression: $\dfrac{dN}{dt}=-k_dN$ where, $N$ is the number of viable spores, $t$I is the time, $k_d$ is the rate constant and $\dfrac{dN}{dt}$ is the rate of change ... reduce the number of viable spores from an initial value of $10^{10}$ to a final value of $1$ is (up to two decimal places) __________
asked Feb 20, 2018 in Bioprocess Engineering and Process Biotechnology gatecse 1.4k points
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3
An aqueous solution containing $6.8$ mg/L of an antibiotic is extracted with amyl acetate. If the partition coefficient of the antibiotic is $170$ and the ratio of water to solvent is $85$, then the extraction factor is ________
asked Feb 20, 2018 in Bioprocess Engineering and Process Biotechnology gatecse 1.4k points
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4
A microbial strain is cultured in a $100$ L stirred fermenter for secondary metabolite production. If the specific rate of oxygen uptake is $0.4 \: h^{-1}$ and the oxygen solubility in the broth is $8 $ mg/L, then the volumetric mass transfer coefficient $(K_La)$ (in $s^{-1}$) of oxygen required to achieve a maximum cell concentration of $12$ g/L is (up to two decimal places) ___________
asked Feb 20, 2018 in Bioprocess Engineering and Process Biotechnology gatecse 1.4k points
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5
Shear stress versus shear rate behavior of four different types of fluids (I, II, III and IV) are shown in the figure below. Which one of the following options is correct? I-Newtonian, II-Bingham plastic, III-Dilatant, IV-Pseudoplastic I-Pseudoplastic ... -Bingham plastic I-Newtonian, II-Pseudoplastic, III-Bingham plastic, IV-Dilatant I-Newtonian, II-Bingham plastic, III-Pseudoplastic, IV-Dilatant
asked Feb 20, 2018 in Bioprocess Engineering and Process Biotechnology gatecse 1.4k points
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6
Which one of the following bioreactor configurations is the basis for a trickling biological filter? Stirred tank Packed bed Air lift Fluidized bed
asked Feb 20, 2018 in Bioprocess Engineering and Process Biotechnology gatecse 1.4k points
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