Influence of magnesium and strontium substitutions in the structure of hydroxyapatite lattice on the deposition rate and properties of the CaP coatings formed via RF-sputtering of the powder targets

This work is dedicated to studying of the properties of the calcium phosphate (CaP) coatings deposited on Ti substrates by radio-frequency magnetron sputtering (RFMS) of three hydroxyapatite-based powder targets: pure hydroxyapatite (HA), Mg-substituted HA (Mg-HA, Mg = 0.93 ± 0.13 at.%) and Sr-substituted HA (Sr-HA, Sr ∼ 0.47 at.%). The influence of ionic substitutions in the structure of the sputtered targets on the surface morphology, physicochemical properties of the coatings and their wettability were studied. It is revealed that Mg and Sr ionic substitutions in the crystal lattice of HA at these concentrations don't affect deposition rate, however, it influences morphology, wettability and elemental and phase composition of deposited coatings

Stability of Citrinae Subtribe Development in the Conditions of the Mediterranean Area

Fluctuating asymmetry as the value of random deviations reflects either stability or instability of development. It is quite often used by researchers to assess the level of influence of anthropogenic and climatic factors. This study is focused on the territory with favorable climate and low anthropogenic load. The object of the study includes leaf blades of woody plants Citrus X sinensis (Valencia), Citrus limon (Molla Mehmet), Citrus reticulata (Okitsu wase C. unshiu) and Punica granatum (Emek) of the city of Kemer of the Republic of Turkey. The reliability of the presented results is justified by the use of correct methods of study and adequate statistical processing of big data. The integrated indicator of fluctuating asymmetry was the highest for leaf blades of Punica granatum (0.019), Citrus limon (0.017), these plants are introduced species. Citrus X sinensis and Citrus reticulata were characterized by low level of destabilization of plants in the conditions of the Mediterranean Area. It is shown that the most sensitive morphological features of fluctuating asymmetry for Citrinae Citrus X sinensis subtribe plants are j4 and j5, Cítrus límon – j2 and j5, Citrus reticulata – j3 and j4

Неинвазивная вентиляция легких у больных с внебольничными пневмониями тяжелого течения

Acute respiratory failure (ARF) is the leading cause of death in hospitalized patients with severe forms of COVID-19. At the beginning of COVID-19 pandemic the starting respiratory protocol suggested early use of intubation and artificial lung ventilation (ALV) in patients with severe pneumonia complicated by ARF. However, after the analysis of the published studies it was noted that the pathophysiology of the development of ARF in COVID-19 had features that determine the atypical clinical pattern – “silent hypoxemia”. This leads to the late onset of respiratory support (RS) and, as a result, to the lower effectiveness of non-invasive RS methods. This article discusses the creation of an algorithm for the early use of various non-invasive RS methods in patients with COVID-19 complicated by ARF, that will decrease the frequency of hospitalization to the Intensive care units, tracheal intubation and ALV, reduce the duration of treatment and improve prognosis.Острая дыхательная недостаточность (ОДН) является ведущей причиной смерти пациентов с тяжелыми формами COVID-19, госпитализированных в стационары. В первые месяцы пандемии при тяжелой пневмонии, осложненной ОДН, стартовый респираторный протокол предполагал раннее использование у пациентов интубации и искусственной вентиляции легких (ИВЛ). Однако при анализе данных опубликованных исследований отмечено, что патофизиология развития ОДН при COVID-19 имеет особенности, которые обусловливают атипичность клинической картины («тихая гипоксемия»). Это приводит к позднему началу респираторной поддержки (РП) и, как следствие, меньшей эффективности неинвазивных методов РП. В статье рассматривается вопрос создания алгоритма раннего применения различных методов неинвазивной РП у пациентов с COVID-19, осложненным развитием ОДН, что позволит снизить частоту переводов в отделение реанимации, интубации трахеи и перевода на ИВЛ, сократить длительность лечения в целом и улучшить прогноз

The dependence of cylindrical resonator natural frequencies on the fluid density

The article examines the dependence of cylindrical resonator natural frequencies (sensitive element) on the density (mass) of different fluids flowing through it. The cylindrical resonators are being widely applied in automatic control systems of technological processes as oscillating transducer density meter. The article presents the experimental results that prove the dependence of natural frequencies and vibration amplitude on the fluid density

Cherenkov-channeling radiation by relativistic muons in crystals

In this work we analyse Cherenkov radiation by relativistic muons, positive and negative, channeled in optically transparent diamond and silicon crystals in comparison with ordinary Cherenkov radiation. We have shown that the maxima in the spectral angular distributions for both types of radiation are revealed at the derivative extrema for the media refractive index, while, due to the difference in scattering of positively and negatively charged particles at crystal channeling, the number of Cherenkov photons emitted by channeled positive muons might be over the one for negative muons. We have demonstrated that Cherenkov radiation by quasi free projectiles is described as one limiting approximation of a general expression for Cherenkov radiation by channeled projectiles, which takes into account non-zero derivative of the refractive index. The last may result in essential increase of radiation intensity

Experimental Rationale for Using an Eximer Laser for Preparation of Ultrathin Graft for Posterior Lamellar Keratoplasty

Purpose. To rationale experimentally the use of an excimer laser for forming an ultrathin transplant for posterior lamellar keratoplasty. Materials and methods. Atomic force microscopy was used for examination of 10 samples. Control group was 5 corneal flaps obtained by mechanical microkeratome (Moria SLK-2, France). Main group — 5 corneal flaps, obtained by microkeratome and underwent photoablation by “Microscan 500” (Optosystems, Troick, RF) excimer laser at 50 um depth. For quantification of endothelial loss 10 donor corneas (5 pairs) with viable endothelium, preserved in Borzenok—Moroz media, were used. Two groups were formed: main — 5 ultrathin transplants obtained by consistent application of microkeratome and excimer laser, control (from the paired eyes of same donors) — ultrathin transplants prepared by two cuts of microkeratome. Detection of live and dead endothelial cells (EC) was provided by Calcein Violet 450 and Propidium Iodide “vital” fluorescent dyes. Nonparametric Mann—Whitney test was used for statistical analysis. Coefficient of reliability (p < 0.05) was considered to be significant. Results. RMS (roughnessmean square) of the transplant, prepared by excimer laser was — 24.17 ± 12.4 um, and RMS of the transplant prepared by microkeratome — 22.3 ± 18.3 um. Statistical analysis did not reveal significant differences in RMS values in the mentioned groups (p > 0.05). EC death in excimer laser group was 10.35 ± 5.84 %. EC death in microkeratome group — 8.06 ± 1.31 %. No statistically reliable difference of EC death was revealed in the 2 groups (p > 0.05). Conclusions. The investigation has showed identical RMS values in the examined groups, representing high optical qualities of the transplant prepared by excimer laser. EC loss was also comparable in 2 groups. The received results indicate considerable potential of excimer laser transplants for posterior lamellar keratoplasty

Synthesis of polycrystalline CdSiP2 in a gradient temperature field

A procedure for the synthesis of a CdSiP2 compound from the initial elementary components in a gradient thermal field has been developed. The phase and chemical composition of the synthesized and recrystallized material is confirmed by the data of X-ray diffraction analysis and scanning electron microscopy with an energy-dispersive system. The polycrystalline material obtained by the developed method will be used to grow bulk nonlinear optical CdSiP2 crystals

BCM-2.0 -The new version of computer code "Basic Channeling with Mathematica©"

The new symbolic-numerical code devoted to investigation of the channeling phenomena in periodic potential of a crystal has been developed. The code has been written in Wolfram Language taking advantage of analytical programming method. Newly developed different packages were successfully applied to simulate scattering, radiation, electron-positron pair production and other effects connected with channeling of relativistic particles in aligned crystal. The result of the simulation has been validated against data from channeling experiments carried out at SAGA LS