Table 2.
Changes in the relative molar volume, ΔV, sound velocity increment, Δ[U], and adiabatic compressibility, ΔKs, accompanying the thermally induced helix-to-coil transitions of polynucleotide duplexes
| Polymer | Tm, °C | ΔV, cm3⋅molbp−1 | Δ[U], cm3⋅molbp−1 | ΔKS × 104, cm3⋅molbp−1·bar−1 |
|---|---|---|---|---|
| Poly[d(A)]⋅poly[r(U)] | 30.5 ± 0.5 | −10.6 ± 2.0 | 20.0 ± 2.0 | −27.0 ± 4.0 |
| Poly[r(A)]⋅poly[r(U)] | 48.0 ± 0.5 | 0 ± 2.0 | 14.0 ± 2.0 | −13.0 ± 4.0 |
| Poly[d(AT)]⋅poly[d(AT)] | 51.0 ± 0.5 | 8.0 ± 2.0 | 10.0 ± 2.0 | −2.0 ± 4.0 |
| Poly[r(A)]⋅poly[d(T)] | 55.0 ± 0.5 | 0 ± 2.0 | 12.0 ± 2.0 | −11.0 ± 4.0 |
| Poly[d(A)]⋅poly[d(T)] | 56.5 ± 0.5 | 2.0 ± 2.0 | 10.0 ± 2.0 | −7.0 ± 4.0 |