Figure 3: GC/FID chromatograms showing the biodegradation of the hexane-soluble fraction of Arabian light crude oil by some isolates at 30ºC for 28 days. The tested bacterial isolates are NBHCO2 and NBHCO4 (isolated from Bahraini oil fields), NCE3 (isolated from crude oil), I-19 (isolated from Kuwaiti oil field), NKCO-2-2 and NKCO1 (isolated from Kuwaiti oil fields).