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Electrical transformer oil (ETO) includes as dielectric fluids hazardous compounds such as PAHs and sometimes PCBs, which are highly toxic and resistant to degradation. Three species of bacteria, belonging to Acinetobacter lwoffii, Bacillus amyloliquefaciens, and Bacillus pumilus, were isolated from waste ETO. Phenotypic and molecular assays revealed a high potential of A. lwoffii for catabolism of phenanthrene and ETO as a sole carbon and energy source. This article reports for the first time the isolation, identification, and characterization of bacterial diversity hidden in ETO. [ABSTRACT FROM AUTHOR]