Abstract
It has previously been studied that the liver pyruvate oxidase system was activated by addition of nucleosides. In the present papar, the effect of inosine-5'-phosphate and 4-amino-5-imidazole carboxamide riboside on the yeast carboxylase system was studied. It was recognized that the addition of the former accelerates the pyruvate decarboxylase activity but the latter has scarcely influence.