Abstract
It was previously investigated by the authors, that the activities of liver xanthine oxidase, choline oxidase and succinic dehydrogenase in rat varied with age and give a characteristic changing curve respectively. Thus, the normal activities of these enzymes in various growing stages were found.
But these activities will change in different environmental conditions. Furthermore, these changes will differ in different growing stages. By observing these changes an accurate perception in regard to the dynamic status of the living bodies can be obtained.
In this paper, the authors observed the differences of the change of the enzyme activities between young and adult rats which were fed on the protein deficient diet and successfully on the protein rich diet.
By these experiments it was found, that a more labile protein component than that of the enzymes mentioned above exists in the young rat.
The physiological role of xanthine oxidase was also discussed.
