FIG. 1.

Dechlorination of 2,3,4,5-PCB by strain DF-1 with sterilized culture extract from the Desulfovibrio sp. isolated with DF-1 (closed circles), Desulfovibrio vulgaris strain Hildenborough (open triangles), E. coli (closed squares), yeast extract (open diamonds), or with no addition (open circles). 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.