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On-chip LAMP detection of N. meningitidis using purified DNA by a portable UV light pen (a) and fluorescence microscopy (b). Strong fluorescence was observed in N. meningitidis and PC LAMP zones, but not in NC zones. (c) Gray value of the LAMP products measured by ImageJ; (d) fluorescent intensity of the LAMP products measured by fluorescence microscope. The purified DNA template used was 3 × 106 copies per LAMP zone.
