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A new class of fluorescent bio-dots have been successfully prepared by hydrothermal treatment of poly-cytosine DNA at low temperature down to 80°C. The inter-molecule interaction of aromatic cytosine bases forms sp2 carbon-like centers as the luminescence centers or chromophores. In the presence of Ag+, the formation of C–Ag+–C base pairs results in the destroying of the luminescence centers and thus...
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