Abstract
It has been previously reported that Cd^<2+> and Fe^<3+> have remarkably opposite effects on riboflavin cyclic 2', 5'-monophosphate(FMN') production^<1)2)3)> by theGTP-dependent enzyme^<4)> of Rhizopus oryzae or Rh. javanicus as well as on their growth and on their acid production. When Fe^<2+> was added with Cd^<2+> in the culture medium of Rh. javanicus, these effects of Cd^<2+> were depressed. But when Zn^<2+> or Cu^<2+> was added with Cd^<2+> in the culture medium of the mold, effect of Zn^<2+> or Cu^<2+> seemed to be stimulated by Cd^<2+>.
