The effect of the stratopause on the structure of the infrasound signal from the August 4, 2020, Beirut explosion.

The influence of wind velocity and temperature stratification in the upper stratosphere on the waveform of the infrasound signal received at a distance of 2398 km from the epicenter of the powerful explosion in Beirut that occurred on August 4, 2020 is studied using ray trace and pseudo-differential parabolic equation (PDPE) methods. Given a high temporal variability of the wind velocity in the stratopause predicted by the European Centre for Medium-Range Weather Forecasts model, it is assumed that within the stratopause layer, the increase in effective sound speed with increasing height is very small, on the order of 1 m/s. When modeling propagation of the signal from the explosion, the presence of a fine-scale layered structure of wind velocity and temperature in the real atmosphere was also taken into account.

[Morphological changes of the vision organ among winterers in Ukrainian Antarctic station "Academician Vernadskiĭ"].

The study revealed that the Antarctic territory in the area of the Ukrainian Antarctic station "Academician Vernadsky" can be referred to the zone of the "super high", risk in developing ophthalmological pathology, caused by ultraviolet radiation. The results of the comprehensive dynamic study of 24 winterers of the XVI and XVII Ukrainian Antarctic expeditions (2011-2013) showed the developing of specific changes in the organ of vision under the exposure to the excessive natural ultraviolet radiation (UVR), such as parenchymatous-endothelial keratopathy, nuclear-posteriorcapsular phacopathy, maculopathy. Morphological changes were recorded using the cornea densitometry method: a decrease of the central cornea thickness by 14.

[Prevalence of serological markers for viral hepatitis B and C in patients and medical personnel in the hematologic ward of Novosibirsk city hospital No. 2].

Blood samples of 60 patients and 19 staff members were tested for serological markers of hepatitides B (HBV) and C (HBC) using the Vector-Best JSC enzyme immunoassay kits. HBV and HBC markers were found in 25 in 30% of patients and in 15.8 and 5.