bluuebunny/crossref_metadata_2025 huggingface dataset:
Terpolymerization of ethylene, norbornene and dicyclopentadiene catalyzed by modified cyclopentadienyl scandium complexes
Authors: Wang Linfeng , Dong Shuqi , Tian Hui , Gong Guangbi , Wang Baoli , Wu Chunji , Cui Dongmei
Published: June 2023

Terpolymerization of ethylene, norbornene and dicyclopentadiene catalyzed by scandium complexes has been achieved to synthesize corresponding terpolymers. Further transformation results in a huge increase of Tg and decrease in the water contact angle.
New advances in chiral nanographene chemistry
Authors: Anderson Hannah V. , Gois Nicolai D. , Chalifoux Wesley A.
Published: June 2023

This review will highlight several recent and lesser-reviewed works related to the preparation of chiral nanographenes, specifically focusing on structures prepared by non-Scholl methods.
Rational assembly of benzenoid rings in benzo[ghi]perylene yields a diversity of edge features with site-selective reactivity
Authors: Hogan David T. , Zhou Wen , Gelfand Benjamin S. , Sutherland Todd C.
Published: June 2023

Capitalizing on careful assembly of benzenoid rings, benzo[ghi]perylene maximizes the diversity of edge features and reactivities. Experiment and theory unanimously support the notion that the sites are chemically distinguishable.
Extraction of Se(iv) and Se(vi) from aqueous HCl solution by using a diamide-containing tertiary amine
Authors: Narita Hirokazu , Maeda Motoki , Tokoro Chiharu , Suzuki Tomoya , Tanaka Mikiya , Shiwaku Hideaki , Yaita Tsuyoshi
Published: June 2023

A protonated diamide containing tertiary amine (EHBAA) can extract Se(iv) and Se(vi) from HCl via solvation and anion-exchange reactions, respectively.
Highly regioselective and diastereoselective synthesis of novel pyrazinoindolonesviaa base-mediated Ugi-N-alkylation sequence
Authors: Tajik Maryam , Shiri Morteza , Hussain Faiq H. S. , Lotfi Nosood Yazdanbakhsh , Baeiszadeh Behnaz , Amini Zahra , Bikas Rahman , Pyra Anna
Published: June 2023

An efficient base-mediated/metal-free approach has been developed for the synthesis of 1-oxo-1,2,3,4-tetrahydropyrazino[1,2-a]indole-3-carboxamide derivativesviaintramolecular indole N–H alkylation of novel bis-amide Ugi-adducts.
Reduced electron relaxation time of perovskite films via g-C3N4 quantum dot doping for high-performance perovskite solar cells
Authors: Jiang Lu-Lu , Chen Meng-Meng , Tang Xiao-Dan , Tang Ying , Li Shao-Jie , Li Ying , Li Hang-Hui , Liu Hai-Rui
Published: June 2023

Perovskite film-quality is a crucial factor to improve the photovoltaic properties of perovskite solar cells, which is closely related to the morphology of crystallization grain size of the perovskite layer.
Hydration behaviors of nonfouling zwitterionic materials
Authors: Sarker Pranab , Lu Tieyi , Liu Di , Wu Guangyao , Chen Hanning , Jahan Sajib Md Symon , Jiang Shaoyi , Chen Zhan , Wei Tao
Published: June 2023

Understanding the nonfouling mechanism of zwitterionic materials is crucial for their broad applications. Our study reveals the importance of strong hydration bonding, near-neutral net charge, and small dipole moment in achieving fouling resistance.
Structural and dimensional control of porphyrin capsules using Group 15 tris(3-pyridyl) linkers
Authors: García-Romero Álvaro , Miguel Daniel , Wright Dominic S. , Álvarez Celedonio M. , García-Rodríguez Raúl
Published: June 2023

Changing the bridgehead atom of E(3-Py)3(E = P, Sb, Bi) ligands can modulate the size and shape of supramolecular capsules, while coordination to the appropriate metalloporphyrin allows formation of discrete molecular capsules or extended structures.
The contrasting reactivity of trans- vs. cis-azobenzenes (ArNNAr) with benzynes
Authors: Sneddon Dorian S. , Hoye Thomas R.
Published: June 2023

E- vs. Z-azobenzenes engage benzynes in complementary fashion, producing either dihydrophenazine or N-aminocarbazole skeletons, respectively. DFT and experimental mechanistic studies shed light on why.
Enhanced performance of a photodetector based on a graphene/CVD-grown dendritic ReS2/Ta2O5 vertical heterojunction
Authors: Ryu Hyeyoon , Kim Dohee , Choi Yongsu , Kadyrov Arman , Park Wook , Lee Seunghyun
Published: June 2023

Here, a dendritic ReS2/Ta2O5/graphene structure with tunneling contacts and work-function optimized carrier transport layer achieved one of the highest photoresponsivity among devices fabricated with synthesized transition metal dichalcogenide films.
A systematic study of the relationship between the high-frequency dielectric dissipation factor and water adsorption of polyimide films
Authors: Bei Runxin , Chen Kaijin , He Yanwei , Li Chuying , Chi Zhenguo , Liu Siwei , Xu Jiarui , Zhang Yi
Published: June 2023

The dissipation factor of a PI film at high-frequencies is mainly determined by its water adsorption, and the dielectric loss of PI has a linear relationship with its water adsorption, with a slope of 0.74.
Aluminium acetylacetonate ligand passivation for CsPbBr3nanocrystals with improved stability and photoluminescence
Authors: Yu Hao , Yan Bin , Song Yonghui , Zhao Qiqi , Gao Meng , Ning Liangmin , Chen Wei , Fu Min , Wang Kunhua , Ding Jianxu
Published: June 2023

Al(acac)3ligand passivated CsPbBr3NCs for green perovskite LEDs with high color purity and low turn on voltage.
Models of orientational disorder in hybrid organic–inorganic piezoelectric materials
Authors: Tolborg Kasper , Walsh Aron
Published: June 2023

Hybrid organic–inorganic materials offer an alternative to state-of-the-art Pb-based piezoelectric materials. Here, we develop a model Hamiltonian including vibrational entropic contributions to simulate their order–disorder phase transitions.
The N-coil and the globular N-terminal domain of plant ARGONAUTE1 are interaction hubs for regulatory factors
Authors: Bressendorff Simon , Kausika Swathi , Sjøgaard Ida Marie Zobbe , Oksbjerg Emilie Duus , Michels Alec , Poulsen Christian , Brodersen Peter
Published: June 2023

The effector complex of RNA interference (RNAi) contains at its core an ARGONAUTE (AGO) protein bound to a small guide RNA. AGO proteins adopt a two-lobed structure in which the N-terminal (N) and Piwi-Argonaute-Zwille (PAZ) domains make up one lobe, while the middle (MID) and Piwi domains make up the other. Specific biochemical functions of PAZ, MID and Piwi domains of eukaryotic AGO proteins have been described, but the functions of the N domain remain less clear. Here, we use yeast two-hybrid screening with the N domain of the founding member of the AGO protein family, Arabidopsis AGO1, to reveal that it interacts with many factors involved in regulated proteolysis. Interaction with a large group of proteins, including the autophagy cargo receptors ATI1 and ATI2, requires residues in a short, linear region, the N-coil, that joins the MID-Piwi lobe in the three-dimensional structure of AGO. In contrast, the F-box protein AUF1 interacts with AGO1 independently of the N-coil and requires distinct residues in the globular N domain itself. Mutation of AGO1 residues necessary for interaction with protein degradation factors in yeast stabilizes reporters fused to the AGO1 N domain in plants, supporting their in vivo relevance. Our results define distinct regions of the N domain implicated in protein–protein interaction, and point to a particular importance of the AGO1 N-coil as a site of interaction with regulatory factors.
Preface
Authors: Sadullozoda Shahriyor , Uzakov Gulom , Chudov Ivan , Gibadullin Arthur , Zalilova Zariya , Morkovkin Dmitry
Published: June 2023

Within the framework of the presented material, the results of the conducted II International Conference on Agriculture, Earth Remote Sensing and Environment (RSE-II-2023).
Promising directions for the use of pollen in preventive nutrition
Authors: Prokhoda Irina , Eliseeva Elena , Stratienko Elena , Katunina Nataliya , Khlopyanikova Galina
Published: June 2023

The ways to solve a global problem - preventive-metabolic processes of the body through nutrition are discussed at the article. The purpose of the article is to substantiate promising directions for the use of bee pollen in nutrition. Samples of polyfloral pollen of various collections were selected: light (LPF), dark (DPF), lipophilic extract (LPI) and lyophilized extract (IZ). Complex lipids are studied. The expediency of the use of dark bee pollen in the diet for the prevention of diseases associated with metabolic disorders in the membranes of nerve cells, and light bee pollen for the prevention of diseases associated with protein metabolism disorders in the human body are proved.
Improving the quality of irrigation water by vacuum treatment
Authors: Belyaev A.I. , Borovoy E.P. , Pugacheva A.M. , Volskaya O.N. , Petrov Yu.N.
Published: June 2023

The first stage of research of the water purification plant was carried out in laboratory conditions on a hydraulic model at the Department of Water Supply of the Volga State University, the second stage of tests for purification and activation of water was carried out at the experimental production site of the Volga State University “Innovative Village” before sowing tomatoes in the ground, on a plant with a capacity of 10 m3/ day. The second stage included the work performed in the following sequence: first, they achieved stable operation of the water purification unit by vacuum-ejection method, then they achieved stable operation of the water activation unit using a vacuum activator. The final tests were carried out at the start of both installations. The installations worked in semi-automatic mode. It should be noted that the vacuumejection unit includes a vacuum-ejection oxidizer and a semi-automatic sand filter, working as a single unit.
Assessment of the resistance of strawberry varieties to major diseases in the south of Sakhalin
Authors: Kuular Olimpiada
Published: June 2023

The article presents the main diseases of garden strawberries in the monsoon climate of the island. Sakhalin - gray rot and white spot. Observations were carried out from 2017 to 2020 in the experimental nursery of the Federal State Budgetary Scientific Institution “Sakhalin Research Institute of Agriculture”. The purpose of the research was to assess the introduced varieties of garden strawberry for resistance to diseases with the selection of the most resistant varieties for its further introduction. The objects of study were 21 varieties of garden strawberry As a result of the research, varieties that are complexly resistant to white spot and gray rot were identified: Amulet, Deroyyal, El’santa. Deroyyal, El’santa, Figaro, Sal’sa, Tago. Varieties with resistance to white spot are distinguished: Tanyusha, Rumba, Evi, Amulet, Deroyyal, El’santa, Cheburashka. Varieties with weak, 1 point susceptibility to one of the diseases - Rumba, Evi, Cheburashka, Kleri, Podarok sud’by, Vima Zanta, Figaro, Tago, Sal’sa The most affected strawberry varieties to gray rot disease were noted in 2020. The most favorable for the development of white spot disease developed in 2018, 2020, associated with the temperature regime of the air in these years, where the sum of effective temperatures was 781 ° C and 830 ° C. and farms.
Increasing productivity of machine-tractor units depending on the influence of the load of the machine operator with maintenance work in the agricultural enterprises of the Omsk region
Authors: Prokopov S.P. , Myalo O.V. , Myalo V.V. , Maltseva E.I. , Demchuk E.V.
Published: June 2023

Increased productivity of machine-tractor units in the conditions of agricultural production is one of the most important and urgent tasks of the engineering and technical service of the agricultural sector. The greatest impact on machine reliability and performance indicators has a timely and good-quality maintenance. Fault tolerance is crucial to ensuring high machine productivity. The amount of maintenance work increases in proportion to the number of hours worked. Inadequate technical maintenance, leading to increased failure rates, reduced productivity and machine operating hours, and higher operating costs. Machine failures and downtime lead to disruptions in agricultural production technology, which leads to delays and loss of crops. This is a main contradiction that is inherent in the actual system of maintenance and use of machines, in the overlapping timing of their performance. Addressing the problem of increasing tractor uptime in the current environment is of particular importance and relevance. This can be achieved by reducing maintenance downtime by intensifying maintenance during the non-stressful period of fieldwork. It is therefore advisable to outsource part of the maintenance and repair work to specialised enterprises, since there, due to their high specialisation and technical equipment, the quality of such work will be higher than on the farm. Tractor uptime can also be improved through greater specialisation and intensification of maintenance operations by shifting them to non-stressful periods of fieldwork. The study proposes and theoretically substantiates the structure of technical service formation in agro-industrial enterprises. The main advantages of the proposed technical service system are discussed.
Concept for the formation of technical service of agricultural machinery in Western Siberia
Authors: Myalo O.V. , Prokopov S.P. , Myalo V.V. , Maltseva E.I.
Published: June 2023

The service concept for agricultural machinery can only be viable if priority is given to the use of machines in agricultural work. The main contradiction in the maintenance and machine usage system is the overlapping timing: the higher the operating time, the more maintenance work needs to be done. The specifics of determining maintenance load are that current issues and trends in machine maintenance need to be taken into account. They consist in the fact that the technical and financial basis for the formation of an effective specialised service system is now virtually non-existent on the one hand, and the virtual absence of a service consumer because of the insufficient profitability of agricultural enterprises on the other. For the time being, therefore, machinery will have to be repaired and maintained mainly by the farms themselves by replacing worn units and parts with new or second-hand ones in the workshops of the farms. How to make this work more effectively? In the research, the use of agricultural machinery has been considered. Proposed and substantiated the concept of technical service formation at the enterprises of agroindustrial complex of Western Siberia. The main advantages of the proposed agricultural equipment maintenance system concept are discussed.
Determining the workload of the machine and tractor fleet maintenance service in agriculture using the scheduling method
Authors: Myalo O.V. , Redreev G.V. , Prokopov S.P. , Myalo V.V.
Published: June 2023

The efficient operation of agricultural machinery depends on the rational organisation of its maintenance. The most systematic research on the technical service of agricultural machinery has been carried out in GosNITI. An integrated maintenance and repair system for agricultural machinery (TORSELHOZ) has been developed. But this system is currently in contradiction with the emerging trend of declining agricultural machinery production, the expansion of more reliable foreign machines than domestic ones on the domestic market and the lack of qualified staff of machine operators. Machine reliability indicators determine the amount of repair and maintenance work. In its turn, these volumes of work are the initial characteristics for the formation of a repair and maintenance base for the technical service of agricultural machinery. The dealer system, which is very important, is the link between the machine manufacturer and the farmer. However, the dealer service cannot meet such challenges due to a lack of logistical and financial resources, as well as a de facto lack of a service user. Therefore, much of the maintenance and repair work on machinery and tractor fleets must be organised on the farm, with the adopted maintenance organisation system forming a major part of the efficiency of this system. The scheduling method of tractor maintenance takes into account the specifics of agricultural production and ensures timely and complete maintenance. Research has shown that the efficiency of maintenance organisation is mainly influenced by the arable area, the class of personnel in the system, the energy capacity of the farm, the availability of mechanics and the uneven load of MTP over the periods. The main points of the method of organising maintenance according to the scheduling system are defined.
Prospects of ecological transformation within the framework of sustainable development of spatial systems
Authors: Merkurieva K.R.
Published: June 2023

The need to solve the problem of economic progress through the regression of ecology is an urgent issue of our time. Therefore, humanity needs to try to discover and use its own potential to solve environmental problems, while maintaining economic growth. This issue is reflected in sustainable development. The author defines the term “sustainable development of spatial systems”, points to the approaches used to assess sustainable development. In conclusion, the author gives the stages of the implementation of the process of greening economic activity, and also notes the importance of a comprehensive assessment of the sustainability of any spatial system, which must necessarily assume a balanced functioning of all the elements that make it up.
Landscape and ecological optimization of nature management in the Tunkinsky National Park of the Republic of Buryatia
Authors: Vorobyevskaya Elena , Kirillov Sergey , Sedova Natalia , Slipenchuk Mikhail
Published: June 2023

The article considers the processes of development of agriculture in the Tunkinsky National Park as its territory coincides with the Tunkinsky district of the Republic of Buryatia. Trends in the formation of the ecological and economic characteristics of the territory and ecosystem components were analyzed. Component-by-component and cumulative values of the cost of direct and indirect use of ecosystem services in the study area were calculated. Forestry, nature conservation, recreational and agricultural nature management are the main types of the contemporary structure of nature management of the national park. According to our estimations, the average cost of ecosystem services in the park is $35 per 1 ha per year. The calculations performed show not only the ecological but also the economic value of the ecosystems of the Tunkinsky National Park.
Digitalization of the fuel and energy industry: A study of new technologies and their potential
Authors: Dykusova A.G. , Chernonozhkina N.V.
Published: June 2023

The article describes technologies that are implemented into the production processes, evaluates digital solutions taking into account the latest trends that will allow fuel and energy companies and the industry as a whole to increase the competitiveness of their products, identifies the problems of digitalization of the fuel and energy industry and suggests possible solutions.
Study of the possibility of using a sorption mesh to clean the air from formaldehyde
Authors: Zemtsova E.A. , Gornostaeva E.A.
Published: June 2023

The paper considered the possibility of purifying air from formaldehyde by using a carbon sorbent (powder activated carbon) applied in the form of a spray on polymeric mesh. It was shown that the adsorption capacity of the system was 0.69±0.01 cm3/g, and the degree of regeneration of the sorption material reached 37 %, which indicates about of promising this method.
Analysis of the influence on the structural composition of the soil of the main design and regime parameters of the vibratory roller
Authors: Kurdyumov V.I. , Proshkin V.E. , Sharonov I.A. , Proshkin E.N. , Dikov V.V.
Published: June 2023

The article presents the results of experimental studies of a soilcultivating vibratory roller, as a result of which adequate mathematical models have been obtained that characterize the rolling process from the standpoint of compliance with the reference values of the structural composition of the soil. From the condition of ensuring the best quality of work, the optimal mass of the vibratory roller and the rotational speed of unbalancers are determined. According to the results of the research, it was revealed that the quality of rolling by the developed vibratory roller, estimated by the coefficient of compliance with the standard, is 29.9% better than that of the KKZ-6 roller commercially produced by the industry.
Substantiation of the helicoid fertilizer dispenser parameters
Authors: Kalugin Denis S. , Kulaev Egor V. , Vysochkina Lyubov I. , Danilov Mikhail V.
Published: June 2023

The article presents the results of research on a new design of a helicoid dispenser that allows to apply various types of mineral fertilizers in compliance with the requirements for uneven fertilizer application. The material for the study was ammonium nitrate and ammophoska. The dispenser consists of two cylinders with a helicoid surface located between them. The advantage of the design is that the helicoid shape of the dispenser eliminates the cramped state of fertilizer granules during their movement and provides the required application rate range. Studies have shown that with the maximum diameter of fertilizer granules dGmax = 6 mm, the number of entries of the helicoid surfaces will be equal to three, the inclination angle of the helical line of the coils n = 14 degrees. Based on analytical studies, the parameters and operating modes of the helicoid dispenser are substantiated, which allow reducing the unevenness of mineral fertilizers up to 3.4% and increasing the device productivity.
Dynamics of nitrogen group compounds in fish-farming reservoirs of the Valdai National Park in summer period
Authors: Kaurova Z.G. , Petrova M.S. , Taimusova E.N. , Mkrtchyan M.E.
Published: June 2023

According to the requirements of the “Food Security Doctrine of the Russian Federation” and the accompanying “Action Plan for the implementation of the provisions of the Food Security Doctrine of the Russian Federation”, as well as the order of the Ministry of Health and Social Development of the Russian Federation dated 02.08.2010 No. 593n “On approval of recommendations on rational standards of food consumption that meet modern requirements of healthy nutrition”, at least 80% of fish products must be of Russian origin, and the recommended rate of consumption of fish products per capita should be 18-22 kg/year. The following indicators were measured: the concentration of ammonium ions, nitrates, and nitrites, as well as dissolved oxygen. The lack of regular control over the amount of nitrogen-containing compounds in reservoirs used for commercial fish farming does not allow timely identification of the prerequisites for such emergencies.
Study of the influence of vegetable powders on the quality indicators of pasta
Authors: Saidov A.M. , Kalitka D.A. , Moldakhmetova Z.K. , Yeseeva G.K. , Balguzhinova J.E.
Published: June 2023

A rapid development of areas related to the manufacturing of products of increased nutritional value has captured almost all countries of the world. Pasta is one of the most popular food products and is included in the list of everyday products that are in great demand among the population, in this regard, there is an excellent opportunity to reduce the lack of vitamins in a large part of the population by adding non-traditional raw materials to pasta. The authors set a goal to investigate the effect of vegetable powders on the quality indicators of pasta, for which an original recipe for pasta with the addition of carrot powder was developed. The enterprise “Kostanayskyi melkombinat” JSC was chosen as the base for the study. Determination of organoleptic quality indicators of pasta was carried out according to generally accepted methods, on a five-point scale. Physical and chemical indicators were determined according to the method set forth in the regulatory and technical documentation; two qualitative indicators were taken as a basis: the mass fraction of moisture and acidity. Thus, a recipe for a new type of pasta enriched with vegetable powder was developed and the quality indicators of the finished product were evaluated.
Comparative use efficiency of the same type feed additives in the diet of replacement stock and laying hens of the parent herd
Authors: Ovchinnikov A.A. , Matrosova Yu.V. , Bryukhanov D.S. , Mokin S.V.
Published: June 2023

The use of two similar feed additives Sorbitox and Probitox in the diet of replacement stock and subsequently in the diet of laying hens, at a dose of 0.50 kg/t of feed allowed to increase the poultry survival rate at 18 weeks of age by 1.4% with the addition of Sorbitox and 6.4% - with Probitox, the group uniformity by 5.3 and 7.3%, respectively, in comparison with the control group. At the same time, the culling of birds in the experimental groups decreased due to endoenteritis and necrotic enteritidis, and the antibody titer to Gumboro disease increased in the blood. During the productive period of laying hens, the difference in the antibody titer was significantly higher, as was the livestock survival rate. The tested feed additives contributed to a better development of ovogenesis organs. As a result, the egg productivity of chickens with Sorbitox was higher than the control group by 6.5%, with Probitox – by 11.6%. The study of the egg incubation qualities showed that the young stock hatching rate from an average egg size in the group with Sorbitox was 6.9% higher than the control group, with Probitox – by 11.0%, and the hatchability of eggs was 1.1 and 1.6% higher than in the average one. In laying hens at the beginning and at the end of egg laying, the number of infertile small eggs decreased in the group with Sorbitox by 0.60%, with Probitox - by 1.0%, large eggs – by 1.23 and 2.45%, respectively. The chicken hatching rate from small and large eggs in poultry of the experimental groups exceeded the control by 2.9-5.9% at the beginning of egg laying, by 10.0-14.8% at its completion at the age of 56 weeks. The addition of Sorbitox in the diet of replacement stock allowed to reduce feed costs for growing one head of service pullet by 6.9%, with Probitox – by 12.6%, to increase the production profitability by 5.5 and 7.8%, and in laying hens of experimental groups, feed costs decreased by 4.4 and 10.0%, profitability increased by 2.0 and 5.3%, respectively.
Pasture phytocomplexes of Pridonye: Ecological situation
Authors: Vlasenko Marina
Published: June 2023

The purpose of the work is to establish the ecological situation in the pasture phytocomplexes of the Don basin. The objects of research were plant communities on floodplain sod-meadow granular soils and on the sands of the Ilovlinsky massif of the Volgograd region. The occurrence of species on the Drude scale, the vital state of plants, the projective cover of vegetation, and the feed mass consumed were determined. It is established that the main mass of vegetation is oppressed or is in a satisfactory condition. The dominant phytocomplexes are representatives of the Asteraceae families that are resistant to anthropogenic loads and lodging, with a wide ecological amplitude (30% on floodplain sod-meadow granular soils, 38% on sands) and Poaceae (13% on floodplain sod-meadow granular soils, 29% on sands). On floodplain sod-meadow granular soils with a projective vegetation cover of 45%, the feed mass of autumn pastures was 51.2 g/m2, on sands with an average projective vegetation cover of 21%, the feed mass was 24.4 g/m2.
Analysis of liquidity, solvency, and business activity PAC “Klyuchi” of the Nerchinsky district of the Trans-Baikal Territory
Authors: Gavrilova L.M.
Published: June 2023

The article discusses the liquidity, solvency of the enterprise, and the importance of their analysis for the purposes of effective enterprise management. During the analysis, data from financial statements are used, the collected information is processed using analytical methods. The article presents the theoretical essence and significance of assessing the business activity of an organization. The analysis of the main performance indicators of the PAC “Klyuchi” for the period from 2017 to 2021 was carried out, factors that directly affect the business activity of the enterprise were identified, and recommendations aimed at the equity capital growth were proposed [11].
Russia and modern migration crisis: On the rural labor migration
Authors: Stozhko D.K. , Stozhko K. P. , Shilovtsev A.V. , Nekrasov S.N. , Makarova T.N.
Published: June 2023

The article is devoted to the analysis of the migration nature and specifics as a socio-economic phenomenon in the context of the current state and prospects of development of the agrarian economy of the Russian Federation in the conditions of a new social reality. The research objectives: analysis of international rules for the migration policy implementation in the context of the current migration and food crises; assessment of rural labor migration in the Russian Federation; determination of the nature and prospects for regional rural labor migration development. The authors reveal the contradictions and factors of international migration policy and the advantages of Russia in the field of its implementation. The idea is formulated about the need to implement a policy on creation of new jobs, increase of employment in the agricultural sector of the Russian economy, and development of transport infrastructure to support the “labor commutation” characteristic of the old industrial region.
Formation of general professional competencies of students in the occupational safety sector
Authors: Melyakova O.A. , Kuchumova G.V.
Published: June 2023

The staff schedule includes 8.8 thousand positions of forestry workers, and the average number of employees is 6.8 thousand people. There is a steady shortage of labor resources. The situation is typical for all enterprises of the industry of the Ural Federal District. A large number of vacancies in this field is associated with a complex of problems that have accumulated in forestry and require solutions. It is known that the average wage of workers employed in forestry is lower than the wages of workers in all economy sectors in the constituent entities of the Russian Federation. In recent years, there has been a decrease in interest in this type of activity, a decline in the prestige of forestry professions, and as a result, an insufficient professional level of management personnel is recorded. The training of students in the training program “Forestry”, the profile “Forestry” involves the formation of general professional competencies that will help “to create and maintain safe conditions for the implementation of production processes.” In connection with the transition to the new FSES 3++, and the changes made to the curricula for the life safety discipline, it is necessary to find new ways and approaches to the formation of general professional competencies of students. Practices, and especially industrial ones, have a close connection between theoretical and practical training. We propose to gradually implement the development of skills and abilities of the GPC-3 through practice to form competencies fixed by the life safety discipline.
Development of the agrarian and industrial complex of Russia through the use of new technologies
Authors: Zhuravleva Ludmila , Zarubina Elena , Ruchkin Aleksey , Simachkova Natalya , Chupina Irina
Published: June 2023

The agrarian complex of Russia in modern times is a steadily developing sector of the economy. The priorities of the scientific and technical development of the agro-industrial complex have become the Federal Scientific and Technical Program for the Development of Agriculture (FSTP). The program implementation period is from January 01, 2017 to December 31, 2025. At the heart of the program, the main tasks are the promotion of innovations in agriculture, the training of personnel for work in rural areas, the development of selection and seed production and other areas. The program also set tasks to increase the competitiveness of domestic agricultural enterprises and reduce dependence on foreign companies. Two areas of the program are already - actively developing seed and potato breeding and sugar beet production.Agriculture is becoming a more competitive industry with the introduction of new digitalization and automation. These transformations also affect the higher wage growth of agricultural workers, since a modern agricultural worker is a specialist who is able to apply new technologies in his work experience and is able to manage new equipment. The use of new advanced machines and robots speeds up the harvesting process, and new bio-engineering helps to improve the level of development of crops and monitor their growth in real time. Computer technology helps to control weather conditions and avoid crop losses.Digitalization in agriculture is currently a new technology that increases the volume and quality of products, as well as reduce its cost. Information technology is an integral part of modern agricultural production and helps turn backward agriculture into a competitive sector of the economy.
Die genuine Interdisziplinarität der
Perinatalmedizin
Authors: Singer Dominique
Published: June 2023

Liebe Leserinnen und Leser

der vorliegenden Ausgabe der Zeitschrift für Geburtshilfe und Neonatologie
(ZGN) ist online (Zugang über den untenstehenden QR-Code oder den Link) der
Abstractband zur 49. Jahrestagung der Gesellschaft für Neonatologie und
Pädiatrische Intensivmedizin (GNPI) zugeordnet. Die GNPI verweist mit ihrem
diesjährigen Kongressmotto „interprofessionell –
interdisziplinär – international“ auf drei Grundpfeiler der
zeitgemäßen wissenschaftlichen und klinischen Tätigkeit in
unseren Fachgebieten.
ESC-Leitlinie Ventrikuläre Arrhythmien und plötzlicher Herztod 2022 –
was ist neu?
Authors: Müller-Leisse Johanna , Duncker David
Published: June 2023

Die ESC-Leitlinie Ventrikuläre Arrhythmien und plötzlicher Herztod 2022
beinhaltet zahlreiche neue Empfehlungen im Vergleich zur
2015er-Vorgängerversion, unter anderem zur primärprophylaktischen
ICD-Implantation bei Kardiomyopathien. Die diagnostische Bedeutung der
elektrophysiologischen Untersuchung zur Induzierbarkeit ventrikulärer
Tachykardien, der Kardio-MRT zur Beurteilung von Fibrose sowie der
humangenetischen Untersuchung zur Identifizierung von pathogenen Mutationen
wurde hervorgehoben. Mehrere primär elektrische Erkrankungen erhielten
erstmals eigene Abschnitte mit definierten Diagnosekriterien und ebenfalls
neuen Empfehlungen zur Primärprävention. Die therapeutische Bedeutung von
Katheterablationen wurde insgesamt aufgewertet, mit unterschiedlichen
Empfehlungsgraden bei idiopathischen ventrikulären Tachykardien und
ventrikulären Tachykardien auf dem Boden einer strukturellen Herzerkrankung.
Im folgenden Artikel fassen wir weitere für die klinische Praxis besonders
relevante Aspekte aus der neuen Leitlinie zusammen.
Katheterablation ventrikulärer Tachykardien – eher früher als später?
Authors: Maagh Petra , Perings Christian , Strickling Niklas
Published: June 2023

Hintergrund Die Katheterablation von ventrikulären Tachykardien (VT) auf dem Boden einer strukturellen Herzerkrankung ist wirksam in der Behandlung von VT-Rezidiven und Therapien
mit implantierbarem Kardioverter-Defibrillator (ICD). Patienten werden trotzdem häufig relativ spät in ihrem klinischen Verlauf zur Katheterablation vorgestellt.

Ziel der Arbeit Die Fragestellung bezieht sich auf den idealen Zeitpunkt einer Katheterablation, der bis heute Gegenstand intensiver Diskussionen ist.

Material und Methode Nach Veröffentlichung der Leitlinien zum Management von Patienten mit ventrikulären Arrhythmien und zur Prävention des plötzlichen Herztods wurden 3
multizentrische randomisierte kontrollierte Studien veröffentlicht (PARTITA, PAUSE SCD und SURVIVE VT), die den optimalen Zeitpunkt der Katheterablation von VT zu finden versuchen.

Ergebnisse PARTITA, PAUSE SCD und SURVIVE VT konnten den Nachweis erbringen, dass eine frühe VT-Ablation, d. h. nach dem ersten Auftreten einer VT-Episode, nicht nur zu einer
Verringerung der ICD-Therapien mit einem Trend zur Verringerung der Krankenhauseinweisungen wegen Arrhythmierezidiven und Verschlechterung der Herzinsuffizienz führen kann, sondern auch
einen Mortalitätsvorteil liefern kann (PARTITA).

Schlussfolgerungen In Kenntnis der aktuellen Studienlage sollte die frühe Einleitung einer Katheterablation bei Patienten mit struktureller Herzerkrankung frühestens nach dem
ersten Auftreten einer VT-Episode erwogen werden, um positive Effekte nicht zu verpassen. Größere Studien sind erforderlich, um das Risiko/den Nutzen einer Erstlinienablation und seinen
optimalen Zeitpunkt zu bestimmen.
Differenzialtherapie ventrikulärer Tachykardien – Was ist relevant
für die Praxis?
Authors: Reinhardt Adrian , Ventura Rodolfo , Jansen Henning , Lemeš Christine , Veltmann Christian
Published: June 2023

Die Diagnose ventrikulärer Tachykardien (VT) erfolgt elektrokardiografisch
mittels 12-Kanal-Elektrokardiogramm. Sie stellt jedoch gerade in der
Abgrenzung zu aberrant übergeleiteten supraventrikulären Tachykardien (SVT)
im Hinblick auf die Akuttherapie auch für erfahrene Kardiologen nicht selten
eine Herausforderung dar. Daher wurden diagnostische Algorithmen zur
Diskriminierung von SVT von VT entwickelt. Das Management einer
ventrikulären Tachykardie umfasst neben der Terminierung der Rhythmusstörung
die Ursachenklärung und die Stratifizierung im Hinblick auf das Risiko eines
plötzlichen Herztods. Für die Akuttherapie stehen medikamentöse Optionen und
interventionelle Verfahren wie die Katheterablation zur Verfügung.

Der vorliegende Artikel gibt einen Überblick über die verschiedenen
therapeutischen Ansätze zur Akutbehandlung der ventrikulären Tachykardien in
Abhängigkeit der zugrunde liegenden Ursachen.
Validity of Weekly and Monthly Perceived Exertion in
Runners
Authors: Arantes Bertochi Gabriel Felipe , Mota Gustavo R , Haile Luke , Marocolo Moacir , Eidi Sasaki Jeffer
Published: June 2023

The development of the rating of perceived exertion (RPE) enables the easy
assessment of runners’ training strain as well as training load (TL).
However, the long-term and retrospective validity of TL assessment using RPE
scales still needs further investigation. Therefore, this study examined the
validity of weekly and monthly ratings of perceived exertion (W-RPE, M-RPE) in
assessing TL in runners. Healthy adult runners (n=53) rated perceived
exertion using the modified category-ratio 10 (CR-10) scale for each week of a
four-week period, as well as for the month, considering the four-week period.
CR-10 for the week and the month were multiplied by the total training time of
the week and month, respectively, to assess the W-RPE and M-RPE. Training
impulse (TRIMP) was used as the criterion measure. The results indicated that
the W-RPE and M-RPE may be used for monitoring TL during prolonged periods,
presenting a very large correlations with the criterion measure.
Synthesis and Evaluation of Saponins with All-Nitrogenated Sugars
Authors: Okamura Toshitaka , Sato Takaaki , Kage Ayaha , Okuyama Yuya , Kato Erina , Matagawa Tomoe , Kawano Sayaka , Simizu Siro , Chida Noritaka
Published: June 2023

Saponins exhibit multiple biological and pharmacological activities, and the sugar moiety of saponins is known to play a crucial role in bioactivity. In this report, we focus on the synthesis and evaluation of saponins with all-nitrogenated sugar (ANS), in which all oxygen atoms are replaced with nitrogen atoms. OSW-1 derivative-, cholesterol-, and diosgenin-ANS glycosides are synthesized by glycosylation with ANS in the presence of TMSOTf. As a result, the OSW-1 mimic, with ANS, exhibits good cytotoxic activity (IC50 = 7.31 μM) and induces apoptosis.
Transition-Metal-Free Insertion of Diazo Compounds, N-Arylsulfonylhydrazones or Ylides into Organoboronic Acids or Their Derivatives
Authors: Wang Jianbo , Bao Zhicheng
Published: June 2023

Insertion reactions of carbenes or ylides with organoboronic acids or their derivatives have emerged as valuable methods for coupling or homologation of organoboron compounds under metal-free conditions. The crucial steps of these reactions are coordination of the electron-rich carbon centers of the carbene precursors or ylides to the electron-poor boron center, followed by 1,2-migration of the corresponding tetracoordinated boron intermediates. This type of unique transformation provides an efficient method for the construction of C–C or C–X (X = H, B) bonds. Moreover, the C–B bonds generated by such transformations can be utilized as a handle for further derivatization or iterative homologations. In this Account, we summarize the developments in this arena according to the reactive diazo compound, N-arylsulfonylhydrazone or ylide species involved.

1 Introduction

2 Reactions with Diazo Compounds

3 Reactions with N-Arylsulfonylhydrazones

4 Reactions with Ylides

5 Conclusion
Multi-Functionalization of Solid Support via Zn(II)-Mediated Chirality-Directed Self-Assembly
Authors: Overshiner Max S. , Tian Shuyuan , Morrow Kegan B. , Wendt Jailyn R. , Zhou John , Briggs Hannah M. , Márquez Gerardo B. , Kilway Kathleen V. , Moteki Shin A.
Published: June 2023

Establishing a strategy for realizing programmed self-assembly is critical in manufacturing materials with functional hybrid structures. In this work, we introduce a robust methodology for enabling multi-component self-assembly using the concept of chirality-directed self-assembly. A specific combination of heterochiral Zn(II) methylene bis(oxazoline) (BOX) complexes can be selectively generated when combinations of enantiomers of chiral BOX ligands are mixed in the presence of Zn(Oac)2. The resulting Zn(II) BOX complexes, unlike non-covalent bonds, are highly stable and stay intact at elevated temperatures, yet can be reversibly disintegrated under mild conditions using EDTA. This approach can be easily applied to multi-functionalize various solid supports enabling the one-pot generation of multi-functional hybrid structures.
The Impact of the SARS-CoV-2 Pandemic on Stress and Anxiety of Dental Students
Authors: Zenthöfer Andreas , Graf Andreas , Rammelsberg Peter , Klotz Anna-Luisa
Published: June 2023

Objectives To investigate the impact of the severe acute respiratory syndrome-coronavirus-2 (SARS-CoV-2) pandemic on stress and anxiety of preclinical and clinical dental students.

Materials and Methods Dental students (participants) in their clinical course (CC; n = 64) or preclinical course (PCC; n = 53) were included in the study. The subjective perceived levels of stress and anxiety were evaluated using the Dental Environment Stress (DES) questionnaire and the Depression, Anxiety and Stress Scales (DASS) questionnaire. Cortisol levels were measured in saliva samples collected from participants. Knowledge of the pandemic was evaluated using a 100-mm visual analog scale. All data were collected twice: once during the university holidays and once during term time.

Statistical Analysis Results from DES, DASS, and salivary cortisol tests were compared between baseline and follow-up using descriptive and bivariate statistics. Multivariate linear regression models were computed with DES, DASS, and cortisol values as dependent variables to analyze possible influencing factors.

Results Participants showed medium levels of stress and anxiety at baseline and follow-up. The DASS score in the “anxiety” subdomain was significantly higher in the PCC group than in the CC group at baseline (p < 0.001) and increased during term time. DASS scores in the “stress” subdomain also increased during term time. However, both subdomain scores were lower than the cutoff value for a psychological disorder. The mean total DES scores were 615.9 ± 97.7 in the CC group and 580.40 ± 98.9 in the PCC group. These scores indicated medium stress levels and were not significantly different between the groups, nor did they change during the study period. Mean saliva cortisol levels were higher in the CC group (9.2 ± 5.2) than in the PCC group (4.9 ± 2.2) at baseline (p < 0.001) but converged by follow-up. Multivariate regression models showed that intraindividual perception of stress at baseline was consistently the most important aspect for changes in stress and anxiety levels during term time. The SARS-CoV-2 pandemic affected stress and anxiety levels in some participants, but this was not ubiquitous.

Conclusion Intraindividual differences in stress perception seem to be more relevant than course affiliation (preclinical or clinical) or the SARS-CoV-2 pandemic to stress and anxiety levels in dental students.
Spinal Subdural Hematoma following Epidural Anesthesia
Authors: Bhosle Rajesh , Raju Dimble , Patel Shamshuddin Senior , Aditya Grandhi , Shukla Jagriti , Ghosh Nabanita , Krishnan Prasad
Published: June 2023

The spinal subdural space is an avascular, potential space and is a rare location for intraspinal hematomas. Compared to spinal epidural hematomas, spinal subdural hematomas are uncommonly described complications of lumbar puncture for spinal or epidural anesthesia, particularly in patients who have no pre-existing bleeding disorders or history of antiplatelet or anticoagulant intake. We describe a 19-year-old girl who had a large thoracolumbar spinal subdural hematoma following epidural anesthesia for elective cholecystectomy with no pre-existing bleeding diathesis that caused rapidly developing paraplegia that evolved over the next 2 days following surgery. Nine days after the initial surgery she underwent multilevel laminectomy and surgical evacuation with eventual satisfactory recovery. Even epidural anesthesia without thecal sac violation can result in bleeding in the spinal subdural space. The possible sources of bleed in this space may be from injury to an interdural vein or extravasation of subarachnoid bleed into the subdural space. When neurological deficits occur, prompt imaging is mandatory and early evacuation yields gratifying results.