Fig. 5

Transmission electron microscopy microphotograph showing the interaction between silver nanoparticles and A. salmonicida, a electron-dense silver nanoparticles attached to the outer membrane of A. salmonicida (bar = 500 nm). b Widening of periplasmic space, presence of silver nanoparticles inside the periplasm (arrowhead), and marked intra-cytoplasmic edema which appears electron lucent (arrow) (bar = 500 nm). c Silver nanoparticles attached to the outer membrane (arrowhead) of A. salmonicida, with some particles inside the bacterial cytoplasm (arrow) (bar = 100 nm). d Complete lysis of A. salmonicida by silver nanoparticles (bar = 250 nm)