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Schematic diagrams of immunosensors fabrication: (a) Not oriented anti-E. coli O157:H7 on MBA self-assembled monolayer (Au-MBA-Ab); (b) Oriented anti-E. coli O157:H7 on MBA self-assembled monolayer (Au-MBA-ProteinA/G-Ab); (c) Anti-E. coli O157:H7 on electrochemically deposited cysteamine layers (Au-Cys-Ab); (d) Anti-E. coli O157:H7 on cysteamine and ferrocene layers (Au-Cys-Ferrocene-Ab); (e) Anti-E. coli O157:H7 on PAMAM and ferrocene layers (Au-Cys-PAMAM-Ferrocene-Ab).
