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Fig. 7. (A) Tm salt dependence of I-motif (1 mM in strand) in the absence (squares) or presence (circles) of SWNTs (10 mg·ml^-1) in aqueous cacodylic buffer (0.1 mM cacodylic acid/sodium cacodylate, pH 5.5) with 50 mM, 100 mM, 150 mM, and 200 mM NaCl. (B) CD spectra of I-motif (1 mM in strand) in the absence (solid line) or presence (open circles) of SWNTs (10 mg·ml^-1) in aqueous cacodylic buffer (0.1 mM cacodylic acid/sodium cacodylate/100 mM NaCl, pH 5.5). (C) CD spectra of G-quadruplex (1 mM in strand) in the absence (solid line) or presence (open circles) of SWNTs (10 mg·ml^-1) in aqueous cacodylic buffer (0.1 mM cacodylic acid/sodium cacodylate/100 mM NaCl, pH 7.0).

Fig. 8. Plots of fluorescence emission intensity of 5'-fluorescein and 3'-tetramethylrhodamine (TAMRA)-labeled C-rich strand at 520 nm versus the concentration of its complementary G-rich strand in 0.1 mM cacodylic acid/sodium cacodylate and 100 mM NaCl at pH 7.0 in the absence of SWNTs (solid squares) or the presence of 10 mg·ml^-1 SWNTs (open squares) and at pH 5.0 in the absence of SWNTs (solid circles) or the presence of 10 mg·ml^-1 SWNTs (open circles).

Table 1. Thermodynamic parameters of d(CCCTAA)₃CCCT, d(AGGGTT)₃AGGG and equimolar mixture of d(CCCTAA)₃CCCT/d(AGGGTT)₃AGGG in aqueous cacodylic buffer (0.1 mM cacodylic acid/sodium cacodylate/100 mM NaCl)