In a well aerated and agitated microbial culture, the supply' of oxygen is equal to demand' (uptake) of the growing culture. The KLa for such a system will be (KLa = volumetric mass transfer coefficient, C* = dissolved oxygen concentration in liquid in equilibrium with gaseous oxygen,C = instantaneous value of dissolved oxygen concentration, r' = specific oxygen uptake rate per unit weight of cells, X = dry weight of the cells per unit volume)

In a well aerated and agitated microbial culture, the supply' of oxyg

1.	In a well aerated and agitated microbial culture, the supply' of oxygen is equal to demand' (uptake) of the growing culture. The KLa for such a system will be (KLa = volumetric mass transfer coefficient, C* = dissolved oxygen concentration in liquid in equilibrium with gaseous oxygen,C = instantaneous value of dissolved oxygen concentration, r' = specific oxygen uptake rate per unit weight of cells, X = dry weight of the cells per unit volume)
A.	(r X)/ (C* C)
B.	(r)/ X(C* C)
C.	(C* C)/ (r X)
D.	(X)/ r(C* C)
Answer» B. (r)/ X(C* C)

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