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What is the function of moderator in a n...

What is the function of moderator in a nuclear reactor ?

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Bio-reactor is a large vessel which is used for biological conversion of raw material into specific product.
A stirred-tank bio-reactor is usually cylindrical or with a curved base to facilitate the mixing of the reactor contents.
The stirrer facilitates even mixing and oxygen availability throughout the bio-reactor. Alternatively air can be bubbled through the reactor. It has an agitator system, an oxygen delivery system, a foam control system, a temperature control system, pH control system and sampling ports, so that small volumes of the culture can be with drawn periodically.
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