Antibacterial activity of the cell-free supernatant from L. taiwanensis. Antimicrobial activities of the cell-free supernatant from L. taiwanensis were examined against two Gram-negative bacteria (a) and two Gram-positive bacteria and a yeast (b), whose MIC50s were determined (c). x- and y-axes indicate the concentration of peptides in the used cell-free supernatant and the absorbances at 600 nm, respectively (a,b). The y-axis and different letters (A, B, and C) in (c) represent the MIC50 and significant differences (p < 0.05), respectively. SG; Salmonella Gallinarum, EC; enteropathogenic E. coli, BC; Bacillus cereus, SI; Streptococcus iniae, SC; Saccharomyces cerevisiae.