Electrochemical Properties of PrBaCo2O6electrode in the Oxidation of Glucose and Methyle Orange

In this work, we investigate the possibility of using double cobaltite with the composition PrBaCo2O6 as an electrocatalyst in the oxidation of organic compounds. A screen-printed carbon electrode modified with the PrBaCo2O6 drop method was investigated as a sensor for glucose. The amperometric signal of this sensor is logarithmically dependent on the analyte concentration according to the equation: I (μA) = 9.485⋅ln(C (mM)) + 17.864 (R = 0.9951). The limit of detection is 0.52 μM (at S/N = 3). The linearity range is 0.0-17.5 mM, which corresponds to the physiological values of blood glucose concentration (3.3-5.5 mM). In addition, the possibility of electrooxidation of a refractory organic compound (methylene orange) using a modified electrode was shown. © Published under licence by IOP Publishing Ltd.The authors appreciate the support of this work within the government assignment No AAAA-A19-119110190048-7

Recycling of Gold Tailings of Silicate-Carbonate Ores

The implementation of the method for extracting gold, including melting of silicate-carbonate technogenic material, showed that gold passes into a free state, and the size of its particles increases significantly. However, when the material melts, a significant amount of slag is formed, which must be disposed. The chemical composition of the slag was compared with the norms of approximate and maximum permissible concentration. The content of Cu, As, Sb, S, and Mn exceeds the established standards. When the melt is blown with air and natural gas, sulfur, arsenic, and antimony will pass into the gas phase. In this regard, the installation must be equipped with a dust and gas cleaning system. If 12 wt.% CaO is added to the initial mixture before melting, the slag will meet the requirements when it is used as a correcting additive in cement. © Published under licence by IOP Publishing Ltd.The research was supported by the Ministry of Science and Higher Education in accordance with the state assignment for Ural State Mining University No. 0833-2020-0008 “Development and environmental and economic substantiation of the technology for reclamation of land disturbed by the mining and metallurgical complex based on reclamation materials and fertilizers of a new type”. We obtain the scientific results using the equipment of the Centre for the collective use of scientific equipment of the Federal Scientific Centre of biological systems and agricultural technologies of RAS as well (No Ross RU.0001.21 PF59, the Unified Russian Register of Centres for Collective Use - http://www.ckp-rf.ru/ckp/77384)

RESEARCH OF AN ENZYME-FREE FUEL CELL BASED ON DOUBLE PEROVSKITES FOR THE DETECTION OF HYDROGEN PEROXIDE

The electrochemical characteristics of glassy carbon electrodes modified with perovskites by voltammetric methods and in the power generation mode are studied. A fuel cell was as-sembled, generating direct current and potential at the electrodes, and its characteristics as a sensor were studied

Migraine and sleep disorders: a systematic review

Migraine and sleep disorders are common and often burdensome chronic conditions with a high prevalence in the general population, and with considerable socio-economic impact and costs. The existence of a relationship between migraine and sleep disorders has been recognized from centuries by clinicians and epidemiological studies. Nevertheless, the exact nature of this association, the underlying mechanisms and interactions are complex and not completely understood. Recent biochemical and functional imaging studies identified central nervous system structures and neurotransmitters involved in the pathophysiology of migraine and also important for the regulation of normal sleep architecture, suggesting a possible causative role, in the pathogenesis of both disorders, of a dysregulation in these common nervous system pathways. This systematic review summarizes the existing data on migraine and sleep disorders with the aim to evaluate the existence of a causal relationship and to assess the presence of influencing factors. The identification of specific sleep disorders associated with migraine should induce clinicians to systematically assess their presence in migraine patients and to adopt combined treatment strategies

Research on the readiness of preschool teachers for innovative activities

The article presents a study of the potential of teachers to implement innovations in their professional activities and factors hindering the transition to the mode of innovative development. The study revealed that, according to a number of indicators, the level of innovative readiness for mastering innovations among respondents is low, and that purposeful and systematic work is needed both from the management and the teachers in order to introduce innovations in preschool educational institutions. The study uses an integrated approach aimed at finding tools and methods of training preschool teachers with diverse social and intellectual needs, who are able to develop in their professional activities. Recommendations for the preparation of preschool teachers for innovative activities are presented.Исследован потенциал педагогов в отношении использования ими инноваций в своей профессиональной деятельности, а также в отношении факторов, препятствующих переходу в режим инновационного развития. Выявлено, что по ряду показателей у респондентов уровень инновационной готовности к освоению новшеств низкий и что для внедрения инноваций в дошкольных образовательных учреждениях необходима целенаправленная, систематическая работа как руководства, так и самих педагогов. В исследовании использован комплексный подход к поиску средств и способов подготовки педагогов дошкольного образования с разносторонними социальными и интеллектуальными потребностями, способных развиваться в процессе своей профессиональной деятельности. Даны рекомендации по подготовке педагогов дошкольного образования к инновационной деятельности

A comparative study of Epipactis atrorubens in two different forest communities of the Middle Urals, Russia

The objective of this study was to compare eco-physiological and morphological parameters of a regionally endangered orchid species, Epipactis atrorubens (Hoffm. ex Bernh.) Bess., growing in two forest communities (on serpentine and granite outcrops) of the Middle Urals, Russia. Biodiversity, dominance, and phytocoenosis studies showed the colonization of a wide range of plant species on both sites. The physicochemical properties of the soil, chemical composition and morphological features of E. atrorubens, growing under technogenic conditions (asbestos deposits), on serpentine outcrops and in the natural environment of the granite massif were studied for the first time. The serpentine substrate differed from the granite one by its greater stoniness, circumneutral pH and lower contents of available nitrogen and phosphorus. Extremely high concentrations of magnesium were found in the serpentine soil, some 79 times higher than in the granite substrate. High concentrations of nickel (94 times), chromium (59 times), cobalt (17 times), and iron (4 times) were found in the serpentine substrate, higher than in the granite substrate. The differences between the sites for available metal contents and for root and shoot metal contents were significantly less. Concentrations of most of the metals in the roots were higher than in the shoots. Despite higher metal concentrations and lower nitrogen and phosphorus levels in serpentine soils, E. atrorubens had a larger population and greater viability compared to those growing on granite. Plants on serpentine outcrops were characterized by the formation of a larger number of fruits, greater root lengths and thicker leaf blades, compared to plants on granites. The well-developed orchid mycorrhizae contributed to the survival of this species under unfavorable serpentine conditions. Hence, serpentine outcrops formed due to the mining of asbestos could be a suitable substrate for the light-demanding E. atrorubens due to its capacity to adapt to dry, rocky, nutrient-depleted soils and limited competition from other plants. © 2019, The Author(s).The work was supported by the Ministry of Science and Higher Education of the Russian Federation in the framework of the State Task of UrFU No. 6.7696.2017

Natural Forest Colonisation and Soil Formation on Ash Dump in Southern Taiga

Ash dumps occupy significant areas around the world and make a negative influence on the environment. This effect is decreased by their natural colonisation determined by the bioclimatic conditions of the area. The purpose of the current study was to identify the structure of the forest communities and the initial stages of soil formation on the ash dump in southern taiga. This study was carried out on three sites in the forest phytocoenosis formed in the process of revegetation of the Verkhniy Tagil Power Station ash dump over 50 years, as well as on two background forest sites in the Middle Urals. Complex geobotanical and soil studies were carried out. The results of the study show that forest phytocoenoses with a predominance of hardwood species (Betula pendula Roth and Populus tremula L.) and a small admixture of coniferous species can form on the non-recultivated ash dump within 50 years in a boreal zone. In total, the studied mixed forest phytocoenoses are similar in composition to zonal secondary forests, but differ by having lower height and diameter of the stand, as well as herb–shrub layer coverage. Their species density and floristic richness are also lesser. The study proved that the process of soil formation is also proceeding according to the zonal type in the ash substrate under forest communities. The results of the study can be applied to justifying the forecasts of ecosystem restoration on the technogenic substrate, as well as for the species selecting for their recultivation in the studied area and similar to it. © 2020 by the Committee on Forestry Sciences and Wood Technology of the Polish Academy of Sciences and the Forest Research Institute in S´kocin Stary

ОСОБЕННОСТИ РАБОТЫ С ПАЦИЕНТАМИ, НАХОДЯЩИМИСЯ В ЛИСТЕ ОЖИДАНИЯ ТРАНСПЛАНТАЦИИ ПЕЧЕНИ

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Design activity as a formation condition student's civil identity

The article considers the need to realize the potential of students' project activities for the upbringing of civic identity.В статье рассматривается необходимость реализации потенциала проектной деятельности студентов для формирования гражданской идентичности