<p>A. Control group with no AgNPs stimulated. The typical morphology of <i>E</i>. <i>coli</i> was observed with the integrity cell membrane. B. <i>E</i>. <i>coli</i> stimulated with 5 μg/ml AgNPs group. The integrity cell membrane with no significant obvious damage can be found. Besides that, several electron dense granules also can be observed (the red arrow). C. <i>E</i>. <i>coli</i> stimulated with 10 μg/ml AgNPs group. There are also electron dense granules in <i>E</i>. <i>coli</i> (the red arrow), and the cell membrane also show the integrity.</p
