Biopolymers and cell. 1988. Volume 4. № 4. 177 - 182

E. E. Minyat, A. T. Karapetyan, P. O. Vardevanyan, V. I. Ivanov

PHASE SURFACE OF THE B-Z EQUILIBRIUM FOR poly[d(Q-C)] SOLUTION IN COORDINATES: NON-ELECTROLYTE FRACTION, IONIC STRENGTH, TEMPERATURE

Summary

    A fragment of the B and Z interfaces of poly[d(G-C)] within 45-58% ethanol, 10-45 °C and 0.5-3 mM NaCl is a plane. A projection (ethanol fraction, ionic strength) testifies to the occurrence of the reverse Z—"B transition with an ionic strength increase, which was predicted by a polyelectrolyte theory but up to now was not observed with poly [d(Q-C)]. Using the polyelecfrolyte model the projection (temperature, ionic strength) permits esti¬mating enthalpy of the Z-B transition: AHBZ=—1.4 kcal/mol.