FIG. 3.

Increase in 16S copy number specific to strain DF-1 in relation to dechlorination of 2,3,4,5-PCB. The open circles represent chlorines per biphenyl. The closed diamonds represent 16S copy number detected by competitive PCR from cultures grown with 2,3,4,5-PCB. The open square represents the 16S copy number detected from cultures grown without PCB at time zero (all other readings were below the detection limit of 3,500 copies). All data are the averages from triplicate cultures, and error bars represent the standard deviations. Each culture received 10 mM sodium formate and 173 μM 2,3,4,5-PCB. Congener 2,3,5-PCB was the only dechlorination product detected.