[Patterns in the formation of proteolytic enzymes by different strains of C1. botulinum type F]

The authors studied regularities attending the accumulation of proteolytic enzyme and toxin by C1. botulinum, type F, strains in the medium. Strains No. 470, 200, 76, 55 proved to possess caseinolytic capacity, whereas strains Eklund and Craig were "nonproteolytic". C1. botulinum strain, type F, medium and growing conditions providing a high yield of proteolytic enzymes were selected. Some properties of proteolytic enzyme of strain No. 470 were studied.