Explain the reason for the following: (a) STRs are constructed of stainless steel or glass (b) Bubble columns reactor has an uneven gas distribution. (c) The desired product in a fermentation is...

Explain the reason for the following:

(a) STRs are constructed of stainless steel or glass

(b) Bubble columns reactor has an uneven gas distribution.

(c) The desired product in a fermentation is produced during the stationary phase of the growth cycle.