Fig. 7From: A synergistic bactericidal effect of low-frequency and low-intensity ultrasound combined with levofloxacin-loaded PLGA nanoparticles on M. smegmatis in macrophagesTEM analysis of the morphological change in the RAW264.7 cells and the intracellular M. smegmatis in the different treatment groups. Nucleus in the yellow dotted line; autophagosomes (white arrows) were found in the US group; Intracellular nanoparticles (red arrows) were found in the LEV-NPs group (magnification, ×30,000); lipid droplets (yellow arrow) were found in the LEV + US group; Nanoparticles (blue arrows) in bacteria were found in the LEV-NPs + US (magnification, ×30,000)Back to article page