Broken local symmetry in paraelectric BaTiO3 proved by second harmonic generation.

Precursor dynamics of a cubic to tetragonal ferroelectric phase transition in BaTiO3 is studied by the accurate measurement of the second harmonic generation (SHG) integral intensities. A finite signal holds for the SHG integrated intensity above the ferroelectric Curie temperature T(c)=403  K. Above the Burn's temperature T(d)≈580  K, the power law with the exponent γ=1 shows normal SHG nature originating from the hyper-Raman scattering by dynamical polar excitations, while, below T(d), a SHG signal from polar nanoregions becomes dominant with the larger exponent γ=2.

[Laser irradiation: study of total effect of irradiation of the eyeball. A clinical study].

Lipid peroxidation products, antioxidant system parameters, somatotrophic hormone, corticosteroids, fibronectin, and cyclic nucleotides were measured in the blood of 119 patients with open-angle glaucoma and mature senile cataract before and after a course of exposure of the eyeball to He-Ne laser. Statistically significant changes in the examined parameters were revealed, explaining to a great measure the antiinflammatory and vasodilating effects of laser and its ability to intensify the repair processes.

[Effect of stimulation of emotiogenic zones of the rat hypothalamus on the course of pregnancy and the growth of the progeny].

The course of pregnancy and progeny development was studied in white rats with different emotional background during pregnancy. Self-stimulation of emotionally positive zones of the lateral hypothalamus and forced stimulation of emotionally negative zones of the ventral hypothalamus were taken as models of emotional states. Stimulation or self-stimulation of these structures, while causing unidirected negative effect on pregnancy and progeny, affected in different ways the speed of conditioning in viable progeny.