Fig. 2.

Reductive dechlorination of Aroclor 1260 in pure cultures after 6 mo of incubation and PCB- and PCE-dependent growth of the Dehalococcoides isolates. (A) Absolute difference in the congener distribution of Aroclor 1260 residues between the abiotic control and pure cultures CG1, CG4, and CG5. Negative mol % indicates the amount of PCBs being dechlorinated; positive numbers represent produced PCB congeners. Growth of the Dehalococcoides isolates is coupled with reductive dechlorination of (B) Aroclor 1260 and (C) PCE. Controls are cultures without PCB and PCE amendment. Error bars represent SDs of triplicate cultures. See Fig. S2C for PCB and PCE dechlorination and cell growth supported by chlorine removal.