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A new fluorimetric aptasensor was designed for the determination of adenosine triphosphate (ATP) based on magnetic nanoparticles (MNPs) and carbon dots (CDs). In this analytical strategy, an ATP aptamer was conjugated on MNPs and a complementary strand of the aptamer (CS) was labeled with CDs. The aptamer and its CS were hybridized to form a double helical structure. The hybridized aptamers could...