[Study of dynamic properties of water in poly(A) and poly(U) solutions by proton magnetic resonance]

Proton magnetic relaxation in aqueous solutions of polyadenylic and polyuridylic acids in the temperature range (10-80 degrees C) and acidities (pH 3-9.7) has been investigated. Activation energies of water molecule diffusion and proton exchange, as well as the velocities of these processes have been determined. It is established that from the point of view of magnetic relaxation, the state of single helices resulted from the thermal conformation transition, are not equal to the state obtained by the change of the pH of solution; it refers both to the secondary structure of the chains and the dynamical behaviour of the biopolymer hydrate layers.