Fig. 3From: Microbial enhanced heavy crude oil recovery through biodegradation using bacterial isolates from an Omani oil fieldBacterial growth assay (OD660). The data represents average of three independent experiments with SD values (±). Three different miocrobial density trends were observed in the medium M2: high density (AS3, AS4 and AS5), intermediate density, initial higher density (AS1, AS2 and AS6) and low density (AS7–AS10). The media M4 and M5 showed poor growthBack to article page