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. 2016 Jan 22;6:19806. doi: 10.1038/srep19806

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(a) E. coli O157:H7 bacteria, (b) AuNP-labeled E. coli O157:H7 bacteria without washing, (c) AuNP-labeled E. coli O157:H7 bacteria washed with PBS, (d) complex after the addition of HAuCl₄ and NH₂OH to AuNP-labeled E. coli O157:H7 bacteria.