Fig. 5From: Genetic engineering of the precursor supply pathway for the overproduction of the nC14-surfactin isoform with promising MEOR applicationsThe oil washing efficiency of the two surfactin preparations at different concentrations. a Photographs of dried oil sand after washing. b The oil washing efficiency corresponding to the samples shown in A. Error bars indicate standard deviation for triplicate experiments. The superscript letters in the Fig. 5b were the results of Dunnett-t test (a = 0.05)Back to article page