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AFM images of the 1444-bp DNA fragments deposited onto mica for a ns2 value equal to 0.65 and with three different concentrations of MgCl2 and NaCl: (a) [MgCl2] = 6 mM and [NaCl] = 90 mM; (b) [MgCl2] = 20 mM and [NaCl] = 150 mM; (c) [MgCl2] = 60 mM and [NaCl] = 300 mM. Compared with Fig. 6, we can observe that DNA molecules have a more released shape, whereas they appear more condensed with a lot of crossovers for ns2 = 0.95. Scan area, 4 × 4 μm2; z range, 3 nm; scan frequency, 1 Hz.
