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Growth curves of strains CKU-1 and RKU-1 in filtered sterile formation water with 10% (vol/vol) crude oil under anaerobic conditions (KFW medium) at their optimum temperatures. ▴, CKU-1 in KFW medium; ▵, CKU-1 in KFW medium containing 20 amino acids (each at 0.1 g/liter); ●, RKU-1 in KFW medium; ○, RKU-1 in KFW medium containing sucrose (1 g/liter).
