Figure 3.
Growth and alkaline phosphatase (APase) activities of B. subtilis NCD-2 and its derivative strains during growth in both a high and low phosphate medium. Samples were removed periodically, and APase activities assayed in cell extracts. The values are averages of three replications, with mean values ± SD indicated. Squares, NCD-2 wild-type; triangles, M216 mutant; circles, M216 mutant complemented strain. Open symbols, cell growth in a high phosphate medium; closed symbols, cell growth in a low phosphate medium.