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Comparison of the B. licheniformis B3-15 (a) growth (OD600nm) and the emulsifying index (E24%) of cell-free supernatants (1:1 kerosene) and (b) the crude biosurfactant yield (mg/L) at up to 48 h of incubation in non-optimized (MGV) and optimized media (MGV-op). Data are expressed as averages and standard deviations (n = 3). * Significantly different (p ≤ 0.05) or ** p ≤ 0.01.
