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Zero loss TEM images of an E. coli cell. (A) After reaction with a 0-ppb silver ion solution for 24 h. (B) Enlarged view of portion of panel A. (C) After reaction with a 900-ppb silver ion solution for 24 h. (D) Another E. coli cell after reaction with a 900-ppb silver ion solution for 24 h. OM, outer membrane; PG, peptidoglycan layer; CM, cytoplasmic membrane.
