Abstract
The growth of Lactobacillus casei was not allowed to be responsive to each of such new flavin compounds as flavin cyclic diphosphate, flavinylglucoside mononucleotide and flavin cyclic 2', 5'-mononucleotide of several molds. But these compounds were converted to the active forms by the hydrolysis of H_2SO_4. Therefore, the courrence of some new flavin-inactvating enzymes were claimed to be found by the author.
