On chip specific genetic analysis of Mycobacterium tuberculosis and Hepatitis C. (a) The PDMS/glass point-of-care device that integrates three channels: channel (1) for negative control, channel (2) for DNA detection, and channel (3) for mismatch DNA detection. (b) Schematic illustration of the chemical patterning (steps 1, 2, and 3) for the preparation of the biosensor based on modified ferrocene, as redox marker. Each step is done inside each channel of the fluidic chip before the final hybridization (step 4).