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A highly selective electrochemical biosensor for the detection of Hg 2+ in aqueous solution has been developed. This sensor is based on the strong and specific binding of Hg 2+ by two DNA thymine bases (T–Hg 2+ –T). The hemin worked as a redox indicator to generate a readable electrochemical signal. Short oligonucleotide strands containing 5 thymine (T 5 ) were used...
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