Bacteria primed by antimicrobial peptides develop tolerance and persist
Fig 5
E. coli MG1655 treated for 30 minutes with 1/10xMIC (priming concentration) of pexiganan (A) and non-treated bacteria (B, control) observed under phase contrast microscopy.
The specimens consisted of cells suspended in a 0.1% solution of nigrosin to create a strong contract to visualize the colanic acid capsules. Bacteria were observed with 1000X magnification.