Fig. 4. Effect of 5 x critical micelle concentration (CMC) biosurfactant amendment on phenanthrene (PHE) mineralization in co-inoculated Kenansville (A) and Fallsington (B) soil. Data were normalized by P. strain R or Isolate P5-2 biomass (388 or 210 µg, respectively) and are presented as means of determinations from triplicate experimental microcosms. Vertical bars represent one standard deviation about the mean.