On biaxiality of photoinduced structures in azopolymer films

Spatial orientational structures in the layers of liquid crystalline polymalonates are investigated using UV absorption method and the results of the null ellipsometry technique. Preferential in-plane alignment of azobenzene fragments and in-plane reorientation under irradiation with polarized UV light are established. The components of the order parameter tensor of azobenzene fragments are estimated for the initial state and after different doses of irradiation. The uniaxial as well as biaxial order of the azobenzene chromophores are detected. The biaxiality is observed in the intermediate stages of irradiation, whereas the uniaxial order is realized in the saturated state. The proposed theory takes into account biaxiality of the induced structures and describes well the experimental dependencies of the order parameter components on the time of irradiation.Шляхом використання методу УФ поглинання та результатів еліпсометричних вимірювань вивчені просторові орієнтаційні структури в шарах рідкокристалічних полімерів. Встановлено, що під дією поляризованого УФ випромінювання азобензольні фрагменти орієнтуються переважно в площині. Отримано оцінку для компонентів тензора параметра порядку як у початковому стані, так і після різних доз опромінювання. Виявлено як одновісне так і двовісне впорядкування азобензольних хромофорних груп. Причому двовісність спостерігається у проміжній стадії опромінювання, тоді як одновісний стан реалізується в режимі насичення. Запропонована теорія враховує двовісність індукованих структур і добре описує експериментальні залежності компонентів параметра порядку від часу опромінювання

Agrobiological and economic properties of new high-protein soft winter wheat varieties

New varieties of soft winter wheat with high indices of yielding capacity, protein content, food properties of grain and their economic-valuable, physiological and morphoagrobiological properties have been discovered. It has been found that under the creation of new highly-productive soft winter wheat varieties it is possible to decrease and even to overcome negative correlation of yielding capacity with protein content in grain. It was also found that high protein varieties are capable of forming high yielding capacity of grain with higher indices of protein and gluten content and breadmaking characteristics. Their introduction will facilitate the solving of the problem of the production of high-quality grain to meet the demands of domestic and foreign market, increasing profitability and reviving the international fame of Ukrainian wheat. It has been proved that the implementation of the potential of yielding capacity and properties of grain depends on the genotype with corresponding indices, positive reaction to accumulation of protein and on varietal intensive agricultural technologies, in which the crucial role belongs to the optimization of mineral nutrition, especially on the nitrogen one with regard to agroecological conditions, the time of vegetation renewal in spring, the place in the crop rotation, the presence of nutrients in the soil etc. Varieties Natalka, Vidrada, Epokha Odeska, Lasunia, Lupus, Vilshana, Midas, Poltavka are characterized by considerable adaptive potential of productivity with positive reaction of protein accumulation and high food properties of grain

GROWTH AND CHARACTERIZATION OF BiTeX (X=I, Cl) 3D RASHBA MATERIALS

In this work, the surface structure and transport properties of BiTeCl and BiTeI 3D Rashba materials grown using the modified Bridgman method are studied in detail.The reported study was funded by RFBR, project number 19-29-12061

Increasing Physical Tolerance during Cardiac Rehabilitation Helps to Restore Endothelial Function in Patients after Acute Coronary Syndrome

In recent years, many studies have been aimed at exploring the possibilities of cardiac rehabilitation as a tool to improve the prognosis in patients after acute coronary syndrome (ACS). Endothelial dysfunction is one of the initiating mechanisms of cardiovascular diseases, and myocardial infarction in particular, so it is important to assess the dynamics of changes in the number of endothelial progenitor cells (EPCs) in patients during cardiac rehabilitation with the increase in physical activity. The aim. To establish the relationship between the level of recovery of exercise tolerance and the recovery of endothelial function by determining the number of EPCs in patients undergoing cardiac rehabilitation after ACS. Materials and methods. The study included 44 patients with ST-elevation myocardial infarction who underwent urgent stenting of the infarct-related artery, with a mean age of 59 years (Q1-Q3; 51-64). All the study participants underwent laboratory tests (CD45+/CD34+ cell count before and after the exercise test) and instrumental tests (echocardiography, bicycle ergometry, coronary angiography). Statistical processing was carried out using SPSS Statistics 23 (trial version). Results. According to the results of the exercise test at the first examination, the patients were divided into 2 groups: group 1 with low exercise tolerance (≤50 W) and group 2 with high exercise tolerance (>50 W). The data obtained indicate a link between better recovery of exercise tolerance after ACS and recovery of endothelial func-tion in patients with high exercise tolerance during follow-up compared to the patients whose exercise tolerance did not exceed 50 W, as evidenced by a statistically higher number of EPCs after exercise in patients with a favor-able course and high exercise tolerance (3633 vs. 2400 cells/ml) (p=0.006). Patients with low exercise tolerance were more likely to be diagnosed with lesions of left anterior descending coronary artery (96% vs. 70%, p=0.02). More severe coronary vascular lesions with stenosis of 75% of two or more arteries showed lower pre-exercise EPCs, but increased post-exercise EPCs (+228 cells/ml), whereas in the group with stenosis of more than 75% of one vessel, a decrease in post-exercise EPCs (–604 cells/ml) was observed (p=0.004). If patients have more than one stent, there is a 2.5-fold increased risk of decreased exercise tolerance to values of 25-50 W (relative risk = 1.8; 95% confidence interval: 1.3-2.4). Conclusions. The data obtained indicate that there is an association between a better recovery of exercise tolerance after ACS and recovery of endothelial function in patients with a favorable course at repeated examination, compared to patients whose level of exercise tolerance did not exceed 50 W (low exercise tolerance), as evidenced by a statistically greater number of EPCs after exercise test in patients with favorable course and high exercise tolerance compared with patients with unfavorable course and low exercise tolerance

Порівняння ферментативних властивостей виробничих штамів мікроорганізмів, що використовуються у хлібопекарській галузі, із властивостями референтних штамів

The article deals with the results of the comparative analysis of the enzymatic properties of the production strains of Saccharomyces cerevisiae, Candida milleri and Lactobacillus plantarum,which were isolated from the ferment used in the production facilities of the Kiev region with the properties of the reference strains purchased in the Russian Federation. There were investigated the properties of two production strains of Saccharomyces cerevisiae and Candida milleri and one strain of Lactobacillus plantarum. The isolation of the production strains was carried out by generally accepted methods in microbiology, and their identification was carried out on the basis of the results of the investigation of morphological features and cultural and enzymatic properties according to the determinant of bacteria Burge (1997). The biochemical properties of the bacteria were studied by the indicators of their relation to oxygen, the ability to break down carbohydrates with the accumulation of certain products of metabolism. To determine the ability to ferment carbohydrates and alcohols used short and long “colored” series of Giss. The short series included environments with glucose, lactose, sucrose, maltose and mannitol, and in the long – additionally introduced environments with arabinose, xylose, rhamnose, galactose, as well as inulin, starch, dextrin and glycerol, dulcite and inositol. The incubation was carried out in a thermostat at a temperature of 30 ± 1 °C, and the results were evaluated in 2–4 days, taking into account the change whether there is no change in the color of the indicator and the environment, the appearance or absence of gas in the float, etc. Proteolytic activity was investigated for the ability of microorganisms to dilute gelatin and peptone milk, catalase – by interaction with a 10% solution of hydrogen peroxide, the ability to synthesize indole – Morel method, and ammonia and hydrogen by changing the color of the strip of litmus paper impregnated with the Andrade reagent and lead acetate solution, respectively. It is installed, that the Saccharomyces cerevisiae production strains used at the production facilities of the Kyiv region, as well as the reference strain purchased from the Russian Federation, they fermented glucose, galactose, sucrose, maltose, trehalose, melibiosis, raffinose, melecitosis and ethanol and did not ferment cellobiose, rhamnose, lactose and insulin. However, unlike the reference strains, the production strains did not have the ability to ferment xylose. Candida milleri strains, unlike Saccharomyces cerevisiae strains, do not have the ability to ferment maltose and, unlike reference strains, their production strains do not ferment xylose. The searches have found no differences in the enzymatic properties of the reference and production strain of Lactobacillus plantarum. Both microorganisms fermented glucose, galactose, sucrose, maltose, lactose, raffinose, mannitol and did not ferment rhamnose, arabinose and xylose. Based on the results of microbiological searches of production strains of Lactobacillus plantarum, Lactobacillus fermenti, Saccharomyces cerevisiae and Candida milleri, in particular the search of their enzymatic properties by means of the standardized colorimetric identification system KB009 TM HiCarburgate Kit, at the Ukrainian Laboratory of Quality and Product Safety at the AIC of the National University of Bioresources and nature management of Ukraine were certified the following strains: Lactobacillus plantarum LPR-2018/5; Lactobacillus fermenti LLF-2018/5, Saccharomyces cerevisiae SLC-2017/5, Candida milleri CLM-2017/7.У статті наведено результати порівняльного аналізу ферментативних властивостей виробничих штамів Saccharomyces cerevisiae, Candida milleri і Lactobacillus plantarum, які були ізольовані із заквасок, що використовуються на виробничих потужностях Київської області із властивостями референтних штамів, закуплених у Російській Федерації. Всього було досліджено властивості двох виробничих штамів Saccharomyces cerevisiae і Candida milleri та одного штаму Lactobacillus plantarum. Ізоляцію виробничих штамів проводили загально прийнятими у мікробіології методами, а їх ідентифікацію здійснювали на підставі результатів дослідження морфологічних ознаки та культуральних і ферментативнихих властивостей за визначнико бактерій Берджі (1997). Біохімічні властивості бактерій вивчали за показниками їх ставлення до кисню, здатності розщеплювати вуглеводи з накопиченням певних продуктів метаболізму. Для визначення здатності ферментувати вуглеводи і спирти використовували короткий і довгий “кольорові” ряди Гісса. Короткий ряд включав середовища з глюкозою, лактозою, сахарозою, мальтозою і манітом, а у довгий – додатково вводили середовища з арабінозою, ксилозой, рамнозою, галактозою, а також інулін, крохмаль, декстрин і гліцерин, дульцит та інозит. Інкубацію проводили у термостаті за температури 30 ± 1 °С, а результати оцінювали через 2–4 доби, при цьому враховували зміну чи відсутність зміни кольору індикатора і середовища, появу або відсутність газу в поплавку тощо. Протеолітичну активність досліджували за здатністю мікроорганізмів розріджувати желатин та пептонізували молоко, каталазну – за взаємодією із 10% розчином пероксиду водню, здатність синтезувати індол – методом Мореля, а аміак і сірководень – за зміною забарвлення смужки лакмусового папірця, просоченої відповідно реактивом Андраде і розчином ацетату свинцю. Встановлено, що виробничі штами Saccharomyces cerevisiae, які використовуються на виробничих потужностях Київської області, як і референтний штам закуплений у Російській Федерації ферментували глюкозу, галактозу, сахарозу, мальтозу, трегалозу, мелібіозу, рафінозу, мелецитозу та етанол і не ферментували целлобіозу, рамнозу, лактозу і інсулін. Проте, на відміну від референтного, виробничі штами не володіли здатністю ферментувати ксилозу. Штами Candida milleri, на відміну від штамамів Saccharomyces cerevisiae, не володіють здатністю ферментувати мальтозу і, на відміну від референтних штамів, їх виробничі штами не ферментують ксилозу. Проведеними дослідженнями не встановлено відмінностей у ферментативних властивостях референтного та виробничого штаму Lactobacillus plantarum. Обидва мікроорганізми ферментували глюкозу, галактозу, сахарозу, мальтозу, лактозу, рафінозу, маніт і не ферментували рамнозу, арабінозу і ксилозу. На підставі результатів мікробіологічних досліджень виробничих штамів Lactobacillus plantarum, Lactobacillus fermenti, Saccharomyces cerevisiae і Candida milleri, зокрема дослідження їх ферментативних властивостей проведених за допомогою стандартизованої колориметричної системи ідентифікації KB009 TM HiCarburgate Kit, в Українській лабораторії якості та безпеки продукції АПК Національного університету біоресурсів та природокористування України були паспортизовані наступні штами: Lactobacillus plantarum LPR-2018/5; Lactobacillus fermenti LLF-2018/5, Saccharomyces cerevisiae SLC-2017/5, Candida milleri CLM-2017/7

Giant magnetic band gap in the rashba-split surface state of vanadium-doped BiTeI: A combined photoemission and Ab initio study

One of the most promising platforms for spintronics and topological quantum computation is the two-dimensional electron gas (2DEG) with strong spin-orbit interaction and out-of-plane ferromagnetism. In proximity to an s-wave superconductor, such 2DEG may be driven into a topologically non-Trivial superconducting phase, predicted to support zero-energy Majorana fermion modes. Using angle-resolved photoemission spectroscopy and ab initio calculations, we study the 2DEG at the surface of the vanadium-doped polar semiconductor with a giant Rashba-Type splitting, BiTeI. We show that the vanadium-induced magnetization in the 2DEG breaks time-reversal symmetry, lifting Kramers degeneracy of the Rashba-split surface state at the Brillouin zone center via formation of a huge gap of about 90 meV. As a result, the constant energy contour inside the gap consists of only one circle with spin-momentum locking. These findings reveal a great potential of the magnetically-doped semiconductors with a giant Rashba-Type splitting for realization of novel states of matter.The work was partially supported by grant of Saint Petersburg State University for scientific investigations (N. 15.61.202.2015). This study was supported by the Russian Science Foundation (project N. 17-12-01047, in part of crystal growth, structural characterization and ARPES measurements (Figs 1, 2)). The funding by the University of the Basque Country (Grant Nos GIC07IT36607 and IT-756-13), the Spanish Ministry of Science and Innovation (Grant Nos FIS2013-48286-C02-02-P, FIS2013-48286-C02-01-P, and FIS2016-75862-P) and Tomsk State University Academic D.I. Mendeleev Fund Program in 2015 (research grant N 8.1.05.2015) are also gratefully acknowledged. The authors also acknowledge support from the Russian-German laboratory at BESSY II, the “German-Russian Interdisciplinary Science Center”(G-RISC) program and the Impuls- und Vernetzungsfonds der Helmholtz-Gemeinschaft (Grant No. HRJRG-408).Peer Reviewe

STUDY OF THE ELECTRONIC STRUCTURE OF THE TOPOLOGICAL INSULATOR Bi1.1Sb0.9Te2S

The surface and bulk electronic band structures of Bi1.1Sb0.9Te2S topological insulator were studied by angle-resolved photoelectron spectroscopy (ARPES) and Far- and Mid-in-frared spectroscopy