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Studies on the growth of Phycomyces blakesleeanus in connection with determination of the thiamin inactivating fish factor



Studies on the growth of Phycomyces blakesleeanus in connection with determination of the thiamin inactivating fish factor



Arkiv Bot 32a(9): 1-19



This study follows the earlier discovery that a factor in the viscera extract of some fish is an enzyme which splits the thiamine molecule into pyrimidine and thiazole. Since the pyrimidine cannot be used as a growth factor by P. blakesleeanus. the enzyme causes a decrease in mycelial production. Thus the fungus can be used to assay the enzyme activity. Mixtures of nutrient soln. and thiamine, with and without viscera extract were inoculated and incubated at 20 or 25[degree]C. The mycelium was harvested periodically for 8 to 26 days and the dry wt. detd. The viscera of Abramis blicca. Cyprinus carpio, Scomber scombus, Leuciscus rutilus, L. idbarus and viscera, nerve and muscle tissue of L. erythrophthalmus contain the enzyme in considerable amts. Viscera of Aspius aspius and Coregonus lavaretus contain none. The fish extracts stimulate spore germination and early mycelial growth.

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