FIG. 3.

Time course of VM₁ reductase activity in the mycelia of S. virginiae. At the indicated time, a 500-ml culture was harvested. After sonication to disrupt cells, VM₁ reductase activity in the crude cell extract was measured as described in Materials and Methods. Growth (•) is expressed as grams (wet weight) of cells per liter of culture. VM₁ reductase activity (○) is expressed as microunits per milligram of protein.