2. Materials and Methods
2.1. Isolation of Crude Oil Degrading Bacteria. River Nile
water and soil samples were collected and examined for
isolation of oil degrading bacteria. Crude oil which used in
this study was obtained from Egyptian Petroleum Research
Institute. Crude oil degrading bacteriawere carried out under
aerobic condition with crude oil as sole source of carbon.The
mineral salt media (MSM) with the following composition
(g/L): 0.2 MgSO4, 0.02 CaCl2, 1.0 KH2PO4, 1.0 K2HPO4, 1.0
NH4NO3, and 0.05 FeCl3, and the pH adjusted to 7–7.2 were
amended with 1% filter sterilized crude oil (v/v) according to
Liu et al. [16]. Samples were incubated in flasks on shaker at
120 rpmfor 5 days at 22∘C. Bacterial growth was measured by
using spectrophotometer (Chemito Instruments UV 2600)
at 600 nm and compared with control without inoculation.
Selective solid inorganic media (SSIM) [17] were inoculated
by spreading 100