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. 2017 Jan 27;7:41480. doi: 10.1038/srep41480

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(a) Schematic representation of the DNA molecule and its preparation process for the aqueous DNA solution and DNA-CTMA dissolved in butanol. (b) Absorption spectra of the spin-coated solutions on the quartz substrate, (inset: the prepared DNA solutions). (c) Refractive index of the two thin films, measured by an ellipsometer.