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DNA biosensor for dengue detection: (a) frequency responses of the biosensor at each stage of the detection process; (b) frequency shifts for spiked blood samples. SEM images of the QCM crystal surface: (c) after the hybridisation of target DNA; (d) after the binding of the first layer of AuNPs; (e) after the binding of the second layer of AuNPs. Reprinted with permission from Chen et al. (2009). Copyright IOP 2009.
