الفهرس 
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Abstract
Around 30 colonies with different microbial morphology were isolated from oil contaminated soil and water samples which were collected from oil well located at Red Sea area, Egypt. Eight isolates proved to be promising candidates for naphthalene degradation out of the eight isolates, isolate 5 (Na5) proved to be the most potent isolate capable of naphthalene resistance and degradation. Na5 has high potency in degrading naphthalene concentration to higher concentrations up to 2500 mg/L. Also, five isolates found to be good toluene degrader, three of them, T1, T2, and T3, have relatively similar potency for toluene degradations since there is no great difference in its degradation efficiency. Both isolates have a comparable degradation efficiencies, the three isolates proved to have a great potency for the degradation of higher concentrations of toluene which reached to around 22000 mg/L. While 6 isolates obtained proved their potency for phenol degradation, isolates P1, P2 proved to be the most potent isolates in the phenol degradation efficiency. The two isolates could degrade phenol concentrations with higher efficiency up to 2000 mg/L. The biochemical identification of the different isolates indicated that, isolates P1, P2, T1, T2 & T3 expected to be Bacillus spp. , where isolates Na5 expected to be Pseudomonas spp