Abstract
The effects of four inorganic salts at 10_<-4>, 10_<-2> and 10_<-2> M on the new flavin monophosphate producing activity of Rhizopus oryzae were investigated. When the salts were added in the reaction mixture, NH_4VO_3 showed stimulative effects, on the other hand, BaCl_2 and K_2CrO_4 showed inhibitory effects at any concentration. The addition of 10_<-4> M NH_4VO_3,10_<-4> or 10_<-3> M BaCl_2,and 10_<-4> M K_2CrO_4 in the culture medium, respectively, stimulated the activity of mycelium. The co-addition of riboflavin reduced the inhibitory effect of 10_<-2> M NH_4 VO_3 or 10_<-3> M K_2CrO_4.
