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A ring-like deposition technique is proposed to quantify trace amounts of DNA. Because of the capillary effect of solvent, which compensates for the evaporative loss at the contact line of a nanoliter sample droplet on a hydrophobic surface, materials of the droplet can be carried to the edge of the drop spot, and a ring-like deposit (RLD) can occur. It was found that a fluorescent deposit of α,β,γ,δ-tetrakis[4-(trimethylammonium)phenyl]porphine...
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