Sliding Motility, Biofilm Formation, and Glycopeptidolipid Production in Mycobacterium colombiense Strains

Figure 4

Drop-collapsing test. (a) Water (no surfactant), (b) 1% SDS (surfactant), (c) P. aeruginosa, (d) M. smegmatis mc²155, (e) M. colombiense 19B, (f) M. colombiense CECT 3035, (g) M. colombiense 57B, and (h) M. avium 104. Drop spreading over the oily surface after samples incubation indicates the presence of biosurfactant substances in the aqueous sample. This assay was conducted in three independent experiments, each performed in duplicate.

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