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Impeller-like helical DNA–silica complexes (see picture; green: silica) were synthesized in the presence of magnesium ions (a). DNA chiral packing and corresponding macroscopic helical morphologies are tuned by the change of reaction temperature, pH value, and molar ratio (b) of the quaternary ammonium (yellow)/phosphate group.
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Liu et al. (2011) studied this question.
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