Fig. 1From: Ready-to-use protein G-conjugated gold nanorods for biosensing and biomedical applicationsSchematic representation of covalent and oriented immobilization of antibodies onto PEGylated GNRs in a and b, respectively. The hydrolysis of the enzymatic substrate 4-NPP to 4-NP catalysed by the enzyme bound to the particles after the antibody-antigen recognition is pictured in cBack to article page