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AFM images of DNA forms induced by different concentrations of Mg2+ and pH values (pH = 8.0, 5.0, 3.0). C1(i)–C5(i) pH = 8.0, C1(ii)–C5(ii) pH = 5.0 C1(iii)–C5(iii) pH = 3.0; C1(i)–C1(iii) 3 mM Mg2+. C2(i)–C2(iii) 10 mM Mg2+. C3(i)–C3(iii) 20 mM Mg2+. C4(i)–C4(iii) 50 mM Mg2+. C5(i)–C5(iii) 100 mM Mg2+.
