The determination of the constant of the urea fission rate and study of the temperature dependence (activation energy) of the urease activity on warm- and cold-blooded animals in Ascaris suum and Contracaecum aduncum were undertaken. It has been shown that the constant of the urea fission rate in C. aduncum is more than an order of magnitude higher than that in A. suum. At a temperature of 17 degrees the rate of this process in C. aduncum changes but little while in A. suum it practically ceases. On the contrary, at 47 degrees the urease ferment activity in A. suum increases considerably while in C. aduncum the process rate does not rise as compared to that at 37 degrees. The subsequent calculations of the energy activation have shown that a certain adaptation to definite conditions of ferments functioning can take place.
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