Abstract
Background : Poly chlorinated biphenyls (PCBs) are organic chemicals with toxigenic, carcinogeni c affecting human health and the environment using as dielectric fluids in transformers as a cooling and insulating medium containing. Material s and Methods : Soil samples were collected from transformer oil contaminated soil at different workshops in three different districts of Khyber Pakhtunkhwa i.e. Peshawar, Nowshera and Kohat and were kept at 4°C before analysis. The samples were subjected to Pure culture isolation through a selective medium (Medium A). After incubation for 24 to 48 hours at 37 ° C with 1% transformer oil as sole source of carbon, the isolates were examined for their colony size, shape, margin, consistency, opacity, elevation and
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