Abstract
The thermal inactivation of dry horse serum cholinesterase was found to obey first order kinetics over the temperature range 38–140°. Rogers' (1963) accelerated storage test was applied to this reaction and gave estimates of the rate coefficients and energy of activation of the inactivation reaction which agreed with the values determined in isothermal experiments. The stability of the enzyme preparation at 38° predicted by means of the accelerated storage data coincided with that found by isothermal storage of the enzyme at 38°.

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