Rheiological behaviour of deoxyribonucleoprotein systems of chromatin. I. DNP in high ionic strength solutions (0.7 M NaCl)]

The rheological behaviour of deoxyribonucleoprotein (DNP) in high ionic strength solutions (0,7 M NaCl) is indicative of the presence, in these systems, of linearly ordered DNP microstructures, which are reversibly destroyed by mechanical influences. The examination of the models of spatial network which are capable of providing the limit of fluidity for low concentrated DNP solutions permits to abandon the model of bound tracery network. The existence of interrupted network is proposed which is formed by fixation of microstructures in the secondary potential minimum without direct contact. It is concluded that DNP is able to organize liquid-cristalline structures with linear orientation of the axes of microstructural elements. The possibility of superhelical organization of such microstructures is not excluded. The long-range surface forces take part in stabilization of DNP-microstructures.