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The bench-top bioreactor comes under which type of bioreactor?

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The bench-top bioreactor comes under which type of bioreactor?

(a) Solid-state bioreactor

(b) Photo bioreactors

(c) Airlift bioreactors

(d) Stirred tank bioreactors

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I want to ask this question from Steps in Bioprocess Development : A Typical New Product from Recombinant DNA topic in portion Bioprocess Development of Bioprocess Engineering

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Correct choice is (d) Stirred tank bioreactors

To elaborate: The bench-top bioreactor is a mechanically stirred tank bioreactor fitted with a sparger and a rushton turbine. And its volume varies from < 1-L to 10,000-L capacity. The air is added to the culture medium under pressure through a device called sparger. The sparger may be a ring with many holes or a tube with a single orifice. The sparger along with impellers (agitators) enables better gas distribution system throughout the vessel.

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