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A sensitive signal generation mechanism for gold nanoparticle growth by reducing gold ions with hydrogen peroxide is applied in a plasmonic aptasensor, achieving naked-eye detection of thrombin at the single-molecule level based on the specific interaction of aptamer-thrombin via an arrested rolling circle amplification to yield horseradish peroxidase (HRP)-mimicking DNAzymes as biocatalysts.
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Wang et al. (2015) studied this question.
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