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Fluorescence spectra of E. coli (A), S. epidermidis (B) and K. pneumoniae (C) bacteria cells treated with ampicillin (AMP), tetracycline (TET), zinc ions (Zn2+) and zinc oxide nanoparticles (ZnONPs), before and after immobilization with AMP (ZnONPs/AMP) and TET (ZnONPs/TET), as well as non-treated bacteria (control).
