Dyakonov surface waves in dielectric crystals with negative anisotropy.

Since the initial discovery of Dyakonov surface waves at a flat infinite interface of two dielectrics, at least one of which is , extensive research has been conducted towards their theoretical and experimental studies in materials with positive anisotropy. The potential applications of these waves were initially limited due to the stringent conditions for their existence and the requirement for position anisotropy. In our study, we present the theoretical prediction and experimental observation of a novel type of Dyakonov surface waves that propagate along the flat strip of the interface between two dielectrics with .

Dyakonov surface waves in a thin interfacial waveguide formed by negatively anisotropic dielectrics.

Dyakonov surface waves (DSWs) are electromagnetic surface waves that exist at the interface of two dissimilar materials, with at least one material being anisotropic. Although there are various types of these waves, they all exist in anisotropic materials with positive anisotropy. The requirement for positive anisotropy limits the choice of materials that can support these waves.

The symmetry in the model of two coupled Kerr oscillators leads to simultaneous multi-photon transitions.

We consider the model of two coupled oscillators with Kerr nonlinearities in the rotating-wave approximation. We demonstrate that for a certain set of parameters of the model, the multi-photon transitions occur between many pairs of the oscillator states simultaneously. Also, the position of the multi-photon resonances does not depend on the coupling strength between two oscillators.

[Lipid peroxidation and change in the lipid fraction of plasma in patients with hypertonic disease].

Effect of lipid peroxidation on content and composition of blood plasma lipids was studied in 20 patients with hypertension within various periods after hypertonic crisis. Alterations in blood plasma lipid spectrum were shown to be related to initiation of lipid peroxidation in cell membranes. Dynamics of lipid peroxidation in individual blood plasma lipid fractions appears to reflect the adaptation under conditions of the pathological state of the organism.

[The function of membrane Ca-ATPases and nonenzymatic peroxidation of membrane lipids in patients with hypertension].

Alterations in activity of membrane-bound Ca2(+)-ATPases were shown to depend on the rate of lipid peroxidation in cell membranes of patients with hypertension during the period of crisis. On the basis from these results antioxidants and Ca2(+)-antagonistic drugs could be used for treatment of hypertensive crisis. Monitoring of the disease is possible by means of estimation of the membrane-bound Ca2(+)-ATPases activity.