Recent activity in Bioprocess Engineering and Process Biotechnology / GO BioTechnology

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1

GATE2021
A batch cultivation of E. coli follows zeroth order Monod's growth kinetics. The cell growth is terminated when the residual dissolved oxygen concentration attains 10% of its saturation value and oxygen mass transfer coefficient ( ) L k a reaches its maximum value ( ) 1 ... the final cell concentration in 3 kg m− (rounded off to two decimal places) at the end of the batch cultivation is _

A batch cultivation of E. coli follows zeroth order Monod’s growth kinetics. The cell growth is terminated when the residual dissolved oxygen concentration attains 10% ...

DARSHAN KJ

120 points

DARSHAN KJ asked Oct 20, 2023

–1 votes

1 answer

2

GATE2013-48
A solution was prepared by dissolving $\text{100 mg}$ of protein $X$ in $\text{100 ml}$ of water. Molecular weight of protein $X$ is $\text{15,000 Da};$ Avogadro’s number = $6.022\times 10^{23}$. Calculate the molarity$(\mu M)$ of the resulting solution. $66.6$ $6.6$ $0.67$ $0.067$

A solution was prepared by dissolving $\text{100 mg}$ of protein $X$ in $\text{100 ml}$ of water. Molecular weight of protein $X$ is $\text{15,000 Da};$ Avogadro’s numb...

vidushi chauhan

140 points

vidushi chauhan answered Aug 28, 2023

–1 votes

0 answers

3

How yeast used for whisky production is different from the baker’s yeast and brewer’s yeast?

Deepika sharma gq

110 points

Deepika sharma gq asked May 11, 2022

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4

GATE2014-12
The degree of reduction of ethanol is_______

The degree of reduction of ethanol is_______

Lakshman Bhaiya

1.4k points

Lakshman Bhaiya retagged Mar 18, 2021

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4 answers

5

GATE2014-8
In a batch culture of Penicillium chrysogenum, the maximum penicillin synthesis occurs during the lag phase exponential phase stationary phase death phase

In a batch culture of Penicillium chrysogenum, the maximum penicillin synthesis occurs during thelag phaseexponential phasestationary phasedeath phase

Seema MP

140 points

Seema MP answered Feb 16, 2021

0 votes

1 answer

6

GATE2013-47
A fed batch culture was operated with intermittent addition of glucose solution at a flow rate of $\text{200 ml h}^{-1}$. The values of $K_s,\: \mu_m$ and $D$ are $\text{0.3 g l}^{-1}, 0.4\:h^{-1}$ and $\text{0.1 h}^{-1}$, respectively. Determine the concentration of growth limiting substrate $(gl^{-1})$ in the reactor at quasi-steady state. ______________

A fed batch culture was operated with intermittent addition of glucose solution at a flow rate of $\text{200 ml h}^{-1}$. The values of $K_s,\: \mu_m$ and $D$ are $\text{...

soujanyareddy13

2.7k points

soujanyareddy13 reshown Feb 16, 2021

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7

GATE2014-10
Which of the following is employed for the repeated use of enzymes in bioprocesses? polymerization immobilization ligation isomerization

Which of the following is employed for the repeated use of enzymes in bioprocesses?polymerizationimmobilizationligationisomerization

go_editor

1.4k points

go_editor retagged Dec 31, 2020

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1 answer

8

GATE2018-50
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 _________

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 ...

go_editor

1.4k points

go_editor edited Dec 18, 2020

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9

GATE2018-46
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 $ ... $s^{-1}$) of oxygen required to achieve a maximum cell concentration of $12$ g/L is (up to two decimal places) ___________

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...

go_editor

1.4k points

go_editor edited Dec 18, 2020

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10

GATE2018-45
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 ________

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 ...

go_editor

1.4k points

go_editor edited Dec 18, 2020

1 votes

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11

GATE2018-44
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 ... the number of viable spores from an initial value of $10^{10}$ to a final value of $1$ is (up to two decimal places) __________

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 spore...

go_editor

1.4k points

go_editor edited Dec 18, 2020

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12

GATE2018-36
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- ... -Bingham plastic I-Newtonian, II-Pseudoplastic, III-Bingham plastic, IV-Dilatant I-Newtonian, II-Bingham plastic, III-Pseudoplastic, IV-Dilatant

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?...

go_editor

1.4k points

go_editor edited Dec 18, 2020

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13

GATE2018-13
Which one of the following bioreactor configurations is the basis for a trickling biological filter? Stirred tank Packed bed Air lift Fluidized bed

Which one of the following bioreactor configurations is the basis for a trickling biological filter?Stirred tankPacked bedAir liftFluidized bed

go_editor

1.4k points

go_editor edited Dec 14, 2020

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14

GATE2013-46
The maximum cell concentration $(\text{g l}^{-1})$ expected in a bioreactor with initial cell concentration of $\text{1.75 g l}^{-1}$ and an initial glucose concentration of $\text{125 g l}^{-1}$ is ($Y_{X/S} = 0.6\:g\:cell/g$ substrate) ____________.

The maximum cell concentration $(\text{g l}^{-1})$ expected in a bioreactor with initial cell concentration of $\text{1.75 g l}^{-1}$ and an initial glucose concentration...

soujanyareddy13

2.7k points

soujanyareddy13 edited Nov 7, 2020

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15

GATE2013-23
A batch bioreactor is to be scaled up from $\text{10 to 10,000}$ liters. The diameter of the large bioreactor is $10$ times that of the small bioreactor. The agitator speed in the small bioreactor is $\text{450 rpm}$. Determine the agitator speed (rpm) of the large bioreactor with same impeller tip speed as that of the small bioreactor. ____________

A batch bioreactor is to be scaled up from $\text{10 to 10,000}$ liters. The diameter of the large bioreactor is $10$ times that of the small bioreactor. The agitator spe...

soujanyareddy13

2.7k points

soujanyareddy13 edited Nov 5, 2020

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16

GATE2013-22
A chemostat is operated at a dilution rate of $0.6\; h^{-1}$. At steady state, the biomass concentration in the exit stream was found to be $30\; gl^{-1}$The biomass productivity $(g\; l^{-1}h^{-1})$ after $3h$ of steady state operation will be ___________.

A chemostat is operated at a dilution rate of $0.6\; h^{-1}$. At steady state, the biomass concentration in the exit stream was found to be $30\; gl^{-1}$The biomass prod...

soujanyareddy13

2.7k points

soujanyareddy13 edited Nov 5, 2020