The degradation pathways of a variety of petroleum hydrocarbons (e.g., aliphatics and polyaromatics) have been shown to employ oxidizing reactions; however, these pathways differ greatly because of the specific oxygenases found in different bacterial species. For instance, some bacteria can metabolize specific alkanes, while others break down aromatic or resin fractions of hydrocarbons. Many normal and extreme bacterial species have been isolated and utilized as biodegraders for dealing with petroleum hydrocarbons. This phenomenon is related to the chemical structure of petroleum hydrocarbon components. These organism are showing similarity to Bacillus pumilus, B. subtilis, Micrococcus luteus, Alcaligenes faecalis, Enterobacter cloacae, Pseudomonas aeruginosa respectively