[Screening of Bacillus proteases with plasmin and activator types of action on fibrin]

Forty cultures of aerobic sporogenic bacteria were screened for the plasmin and activator action of bacillar proteases on fibrin. The microorganisms were grown in chemically defined and complex potato-peptone media. Some active cultures were found to produce enzymes with both plasmin and activator types of action. The following organisms exerted the highest activity of the plasmin type; Bacillus macerans PI, strain P3, B. licheniformis 125 and B. firmus. The most active enzymes with the activator type of action were produced by B. macerans PI, Bacillus sp. 21P-7-1, strain 21P-7-2 and B. licheniformis 125.