Considine P J, Coughlan M P
Biosci Rep. 1982 May;2(5):299-302. doi: 10.1007/BF01115115.
The extent of clarification of cellulose-containing agar by "complete' cellulase is a linear function of the logarithm of the enzyme activity. This fact allows a convenient and quantitative estimation of cellulase activity in culture filtrates to be made without the need for tedious dilution. Moreover, such activity can be determined even in the presence of inhibitors such as cellobiose.