Excitonic and electronic transitions in Me-SbSe structures.

The optical anisotropy of the SbSe crystals was investigated at 300 and 11 K. Excitonic features of four excitons (A, B, C, and D) were observed in the optical spectra of the SbSe single crystals and in the photoelectric spectra of the Me-SbSe structures. The exciton parameters, such as the ground ( = 1) and excited ( = 2) state positions and the binding energy (Ry), were determined.

Luminescence at the axial centers of CdP-D crystals.

Emission lines of free excitons and excitons bound to axial centers have been observed in the luminescence spectra of CdP-D crystals doped with Mn, Sn, and Sb at 10 K. Bands models of excitons bound to axial centers (Mn, Sn, Sb) are proposed. The luminescence of crystals doped with Fe does not correspond to the axial centers band scheme.

Proteolytic activity in some freshwater animals and associated microflora in a wide pH range.

Proteolytic activity in some freshwater animals (crustacean plankton, sandhopper Amphipoda sp., larvae of chironomids Chironomus sp., oligochaetes Oligohaeta sp.

[Mitogenic effects of staphylococcal antigenic substances on irradiated lymphocytes from Wistar rats].

Proliferation activity of lymphocytes from rats was studied using a micromethod of blasttransformation reaction after X-ray irradiation (absorbed doses for animals were 0.5 and 1 Gy). Staphylococcus protein A and peptidoglycan stimulated the proliferation of irradiated lymphocytes.

[Features of DNA synthesis in chromatin from rat blood lymphocytes upon exposure to varying doses of ionizing radiation].

Changes in the level of chromatin DNA synthesis after the total X-ray irradiation of rats in the dozes 0.5 Gr, 1 Gr and 7.76 Gr were shown.

Central nervous control of hepatic circulation.

This study was undertaken to assess the role of the hypothalamus and medulla oblongata in regulation of liver circulation in anesthetized dogs. Blood pressure, flow in hepatic artery and portal vein, and shifts of blood volume in the liver were recorded. Stimulation of the anterior hypothalamus produced changes in arterial pressure which were followed by passive changes in hepatic arterial blood flow; changes in hepatic artery resistance were rather small.