ETEKOS experimental ecological system

The problem of changes in the ecology resulting, for example, in increases in water temperature because of discharges from large thermal power plants is considered. An experiment creating a model of such an ecological system is described

The efficiency of Profort additive in feeding cows during the period of increasing the milk yield

The article provides data on the use of Profort feed probiotic additive containing strains of Enterococcus faecium and Bacillus subtilis bacteria in feeding cows during the period of increasing the milk yield. The research was conducted in 2019 on the basis of Agricultural Production Cooperative Collective farm "Iskra", Kirov region. Two groups of highly productive black-and-white motley cows with the average milk yield of 7500 kg for a lactation of 20 animals each were formed for the experiment. The morphological composition and immuno-biochemical parameters of blood of the experimental animals as well as milk productivity and quality indicators of milk were studied, the economic efficiency of Profort probiotic additive use was calculated. It has been established that the inclusion of Profort additive into the animal diet at a dose of 30 g per head per day during 80 days of the period of increasing the milk yield contributes to the normalization of metabolic processes in their bodies, increasing the average daily milk yield by 9.04 – 12.86% (P<0.05), an increase in the percentage of fat and protein in milk by 0.03-0.10%, respectively, compared with the similar indicators of animals in the control group. When using Profort, from the cows of the experimental group in the first three months of lactation 72785.08 kg of milk in a basic fat content of 3.4% were ob-tained, that was 10580.37 kg of milk more as compared with the milk yield of animals from the control group for the same period (62204.71 kg). It allowed to increase the revenue from the sale of milk by 17.01%, to reduce the cost of production of 1 kg of milk by 2 rubles or 11.76% and to get 6.04 rubles of additional profit for each ruble of additional costs. The increase in profit and reduction in the cost of milk production contributed to an increase in profitability by 18.01%

COVID-19 presenting as stroke

© 2020 Elsevier Inc. Objective: Acute stroke remains a medical emergency even during the COVID-19 pandemic. Most patients with COVID-19 infection present with constitutional and respiratory symptoms; while others present with atypical gastrointestinal, cardiovascular, or neurological manifestations. Here we present a series of four patients with COVID-19 that presented with acute stroke. Methods: We searched the hospital databases for patients that presented with acute stroke and concomitant features of suspected COVID-19 infection. All patients who had radiographic evidence of stroke and PCR-confirmed COVID-19 infection were included in the study. Patients admitted to the hospital with PCR- confirmed COVID-19 disease whose hospital course was complicated with acute stroke while inpatient were excluded from the study. Retrospective patient data were obtained from electronic medical records. Informed consent was obtained. Results: We identified four patients who presented with radiographic confirmation of acute stroke and PCR-confirmed SARS-CoV-2 infection. We elucidate the clinical characteristics, imaging findings, and the clinical course. Conclusions: Timely assessment and hyperacute treatment is the key to minimize mortality and morbidity of patients with acute stroke. Stroke teams should be wary of the fact that COVID-19 patients can present with cerebrovascular accidents and should dawn appropriate personal protective equipment in every suspected patient. Further studies are urgently needed to improve current understandings of neurological pathology in the setting of COVID-19 infection

3D Reconstruction as an Experience of Interpretation of Archaeological Materials Dedicated to the Wooden Civil Architecture of Medieval Novgorod of the X Century

Archaeological materials on the house-building of medieval Novgorod are a valuable source for working out issues, concerning scientific substantiation of reconstructions of the appearance of medieval buildings. This article presents the experience of visualization of Novgorod buildings, archaeologically studied at the Troitskiy excavation in Novgorod Velikiy (on the Lyudin end area of medieval Novgorod). One of the eatate complexes of the middle of the X century was chosen as an object for reconstruction. Based on the use of new methods, the construction elements of houses for various purposes, that are part of the courtyard building, have been clarified. Important information about the appearance of buildings was obtained, various variants for their reconstruction were considered. Further perspectives for the use of 3D modeling for the study of medieval building are marked

Investigation of radiation effects in water solutions during exposure with laser or LEDs light

Abstract only.The installation for gamma-, X-ray and neutron registration in water solutions (600 ml LiOH, or NaOH, or Na2CO3) during exposure with red light (λ=645+/-20 nm) of laser or light-emission devises (LEDs) was created. The laser light power was 5 mW and the LEDs - from 600 mW up to 10 W. Neutrons were measured with help of tow 3He counters, placed in paraphine barrel. Small neutron emission (up to 100 neutrons) has been registered in the form of series of short (ms) bursts during some minutes. Tritium production has also been detected in water solution probes. The gamma-ray and X-ray radiation measured by NaI scintillation detector & Geiger counters was not detected. Received results are discussed

Development of a SiPM Camera for a Schwarzschild-Couder Cherenkov Telescope for the Cherenkov Telescope Array

We present the development of a novel 11328 pixel silicon photomultiplier (SiPM) camera for use with a ground-based Cherenkov telescope with Schwarzschild-Couder optics as a possible medium-sized telescope for the Cherenkov Telescope Array (CTA). The finely pixelated camera samples air-shower images with more than twice the optical resolution of cameras that are used in current Cherenkov telescopes. Advantages of the higher resolution will be a better event reconstruction yielding improved background suppression and angular resolution of the reconstructed gamma-ray events, which is crucial in morphology studies of, for example, Galactic particle accelerators and the search for gamma-ray halos around extragalactic sources. Packing such a large number of pixels into an area of only half a square meter and having a fast readout directly attached to the back of the sensors is a challenging task. For the prototype camera development, SiPMs from Hamamatsu with through silicon via (TSV) technology are used. We give a status report of the camera design and highlight a number of technological advancements that made this development possible.Comment: 8 pages, 5 figures, In Proceedings of the 34th International Cosmic Ray Conference (ICRC2015), The Hague, The Netherlands. All CTA contributions at arXiv:1508.0589

Interacting circular nanomagnets

Regular 2D rectangular lattices of permalloy nanoparticles (40 nm in diameter) were prepared by the method of the electron lithography. The magnetization curves were studied by Hall magnetometry with the compensation technique for different external field orientations at 4.2K and 77K. The shape of hysteresis curves indicates that there is magnetostatic interaction between the particles. The main peculiarity is the existence of remanent magnetization perpendicular to easy plain. By numerical simulation it is shown, that the character of the magnetization reversal is a result of the interplay of the interparticle interaction and the magnetization distribution within the particles (vortex or uniform).Comment: 16 pages, 8 figure

Cytokine balance as a diagnostic marker of inflammation in experimental purulent lesions of soft tissues

Inflammatory process is at the heart of artificial (artificial) purulent-inflammatory diseases of soft tissues (APDST), which may lead to the development of phlegmon and abscesses at the site of invasion within a three-day period. The study of the cytokine status of rats with APDST allows us to evaluate the dynamics of inflammation markers and assess the peculiarities of the pathological course in artificial model of inflammation. The experiment was carried out on 126 white Wistar rats divided into 3 groups: (1) the main group (n = 57), where the laboratory model of APDST was used; (2) a comparison group (n = 58), in which the rats were injected with a mixture of opportunistic bacterial strains isolated from pure cultures of human oral fluid, i.e., S. epidermidis, S. mitis, S. salivarius at the titer of 9lg (CFU) per 1 ml injected together with a mixture of 2.5% hydrocortisone acetate emulsion (20 mg per 100 g of animal body weight), and dexamethasone solution at the dose of 0.5 mg; (3) control group (n = 11), where the animals were injected with 0.9% sodium chloride solution in a volume of 0.3 ml, together with a mixture of 2.5% hydrocortisone acetate emulsion at the rate of 20 mg per 100 g of body weight, and dexamethasone solution at the dose of 0.5 mg. Blood cells were studied using the Mindray DC-2800 Vet Auto Hematology Analyzer automated rat blood test system. The dynamics of pro-inflammatory cytokines: tumor necrosis factor (TNF), interleukin-1β (IL-1β), interleukin-6 (IL-6), antiinflammatory cytokines: interleukin-4 (IL-4), interleukin-10 (IL-10) was assessed by enzyme immunoassay. To predict the course of inflammation towards complications, or resolution of the inflammatory process, the ratio of pro-inflammatory to anti-inflammatory cytokines was used, with normal ratio considered an estimated average of the cytokine ratio for the control group. When analyzing results of this experimental study, the nature of cellular inflammatory response was assessed in dynamics, and its relationship with inflammation markers was determined. All animals of the main group developed soft tissue phlegmon within 3 to 7 days from the beginning of the experiment, and their mortality rate was 100%. In comparison group, the abscesses developed in 82.8% of cases on the day 12 to 15 from the start of the experiment, without any deaths observed. The ratio of pro- and anti-inflammatory cytokines in the main group increased 8-fold already by the end of the 1st day, the comparison group was characterized by the absence of significant differences from the control group. The highest levels of pro-inflammatory cytokines were recorded in the main experimental group on the days 12 to 15