Fig. 1From: Highly sensitive SERS platform for pathogen analysis by cyclic DNA nanostructure@AuNP tags and cascade primer exchange reactiona Schematic illustration of the fabrication of cyclic DNA nanostructure@AuNP tags (CDNA); b Principle of Aptamer-activated cascade PER for signal amplification of E. coli O157:H7; c The principle of target bacteria detection using a CDNA-based SERS platformBack to article page