Fig. 7.

The two extracellular nucleases are important for utilization of DNA as phosphate source. Shown are the growth kinetics of wild type (black), ΔdnsΔxds (red), Δdns (green) and Δxds (blue) mutant monitored over 55 h in either M9 Tris glucose with inorganic phosphate (dashed lines) or M9 Tris glucose supplemented with herring sperm DNA (2.5 mg ml⁻¹) as the sole source of phosphate (solid lines). Values represent medians from at least six independent measurements.