Annual variation in waterbird clutch initiation date in relation to spring thaw in Arctic Russia.

To test for the degree of species-specific variation in clutch initiation date in relation to spring thaw, we recorded first egg dates in 1433 nests of seven large bodied long-distance migratory waterbird species breeding on Ayopechan Island in the Chaun Delta, Chukotka, in the Russian Arctic during 2002-2020. Pacific Loon Gavia pacifica, Sandhill Crane Grus canadensis and Glaucous Gull Larus hyperboreus all adjusted timing of clutch initiation completely to annual variation in first frost-free dates. First egg dates of Spectacled Eider Somateria fischeri also significantly advanced in warmer springs, but the rate of change was significantly less than unity, implying a reduced capacity to accommodate change in vernal thaw that may not be able to keep up with greater change in the future.

MATHEMATICAL MODELING OF TELEROENTGENOGRAPHIC PARAMETERS ACCORDING TO THE METHOD OF SCHWARZ A. M. DEPENDING ON THE BASIC CEPHALOMETRIC PARAMETERS IN UKRAINIAN YOUNG MEN AND YOUNG WOMEN WITH DIFFERENT FACE TYPES.

Objective: The aim: Is development and analysis of regression models of teleroentgenographic indices according to Schwarz A. M., which can be adjusted during surgery depending on the parameters that usually do not change in Ukrainian young men and young women with with normal occlusion close to orthognathic occlusion and different facial types.

Ultra-fast artificial neuron: generation of picosecond-duration spikes in a current-driven antiferromagnetic auto-oscillator.

We demonstrate analytically and numerically, that a thin film of an antiferromagnetic (AFM) material, having biaxial magnetic anisotropy and being driven by an external spin-transfer torque signal, can be used for the generation of ultra-short "Dirac-delta-like" spikes. The duration of the generated spikes is several picoseconds for typical AFM materials and is determined by the inplane magnetic anisotropy and the effective damping of the AFM material. The generated output signal can consist of a single spike or a discrete group of spikes ("bursting"), which depends on the repetition (clock) rate, amplitude, and shape of the external control signal.

[Relationship of subclinical atherosclerosis indicators to exercise tolerance in patients with coronary heart disease].

Aim: To study the spread of a number of indicators of subclinical atherosclerosis in patients with coronary heart disease (CHD) and the pattern of their relationship to their functional state and muscle mass.

Subjects And Methods: Twenty patients with chronic forms of CHD were examined. Vascular wall stiffness was judged from pulse wave velocity (PWV) along elastic-type vessels, by calculating the carotid-femoral index (CFI).

[The melatonin influences on neutrophils/lymphocytes ratio of mammals blood depends on age of animals].

The influence of melatonin on age dynamics of neutrophils and lymphocytes in blood of laboratory rats kept under different light conditions and predatory mammals--farmer silver fox, raccoon dog kept under natural light (NL) was investigated. The decrease of lymphocyte level, increase neutrophils content and alteration of neutrophils/lymphocytes ratio of aged rats (24 months) kept under natural light (NL) and standard light (LD) and adult silver foxes (2-5 years) kept under natural light in comparison with juvenile animals were detected. The reduced lymphocytes level and increased neutrophil level in rats under constant light (LL) were revealed in younger ages.