Pub Date : 2022-09-08DOI: 10.29235/1561-8323-2022-66-4-433-443
T. A. Mityukova, O. Y. Poluliakh, K. N. Chudilovskaya, A. A. Basalai, Y. A. Rudnichenko, T. Khrustaleva, S. Hubkin
Obesity causes a wide range of pathophysiological consequences in the body, affecting the sphere of hormonal and psycho-emotional regulation. The aim of the study is to investigate the effect of a high-calorie diet on the development of obesity, reproductive status hormone levels and behavioral features of male Wistar rats, as well as the possibility of normalizing the identified shifts with non-medicinal options for obesity correction. Experiments were performed on 80 sexually mature male Wistar rats for 16 weeks and included 6 groups of animals, taking into account the diet (standard vivarium diet, highcalorie diet and transition from a high-calorie diet to a standard diet at the 2nd stage of the experiment) with or without the moderate physical activity in the form of treadmill running at the 2nd stage – the last 8 weeks of the experiment. A longterm high-caloric diet (16 weeks) caused visceral obesity, elevated glucose, cholesterol and triglyceride levels, dramatically decreased serum testosterone and estradiol levels, and depression manifestations in the Porsolt test in male Wistar rats. Successful correction of obesity, metabolic shifts and depressive behavior in rats was achieved by switching to a balanced diet during the last 8 weeks of the experiment. Normalization of testosterone and estradiol levels against the background of an increased serum luteinizing hormone level occurred in rats receiving a high-calorie diet (16 weeks) with the connection of physical exercise during the last 8 weeks of the experiment. Complex correction of obesity, which included the transition to a standard diet and exercise during the last 8 weeks of the experiment, led to a dramatic 2-fold increase in testosterone levels compared to control and a hyperactive phenotype in male Wistar rats. There is a close relationship between the depression development and testosterone levels in obesity and its correction.
{"title":"Effects of diet-induced obesity and its correction on sex hormone levels and behavioral featurеs of male Wistar rats","authors":"T. A. Mityukova, O. Y. Poluliakh, K. N. Chudilovskaya, A. A. Basalai, Y. A. Rudnichenko, T. Khrustaleva, S. Hubkin","doi":"10.29235/1561-8323-2022-66-4-433-443","DOIUrl":"https://doi.org/10.29235/1561-8323-2022-66-4-433-443","url":null,"abstract":"Obesity causes a wide range of pathophysiological consequences in the body, affecting the sphere of hormonal and psycho-emotional regulation. The aim of the study is to investigate the effect of a high-calorie diet on the development of obesity, reproductive status hormone levels and behavioral features of male Wistar rats, as well as the possibility of normalizing the identified shifts with non-medicinal options for obesity correction. Experiments were performed on 80 sexually mature male Wistar rats for 16 weeks and included 6 groups of animals, taking into account the diet (standard vivarium diet, highcalorie diet and transition from a high-calorie diet to a standard diet at the 2nd stage of the experiment) with or without the moderate physical activity in the form of treadmill running at the 2nd stage – the last 8 weeks of the experiment. A longterm high-caloric diet (16 weeks) caused visceral obesity, elevated glucose, cholesterol and triglyceride levels, dramatically decreased serum testosterone and estradiol levels, and depression manifestations in the Porsolt test in male Wistar rats. Successful correction of obesity, metabolic shifts and depressive behavior in rats was achieved by switching to a balanced diet during the last 8 weeks of the experiment. Normalization of testosterone and estradiol levels against the background of an increased serum luteinizing hormone level occurred in rats receiving a high-calorie diet (16 weeks) with the connection of physical exercise during the last 8 weeks of the experiment. Complex correction of obesity, which included the transition to a standard diet and exercise during the last 8 weeks of the experiment, led to a dramatic 2-fold increase in testosterone levels compared to control and a hyperactive phenotype in male Wistar rats. There is a close relationship between the depression development and testosterone levels in obesity and its correction.","PeriodicalId":41825,"journal":{"name":"DOKLADY NATSIONALNOI AKADEMII NAUK BELARUSI","volume":" ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49126561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-08DOI: 10.29235/1561-8323-2022-66-4-444-453
A. Chervan, V. Melnik, V. Yatsukhno
A quantitative assessment of the areas of vulnerable soils to droughts was presented for the first time and a series of maps was compiled to identify soils of agricultural lands in the zone of the most pronounced risk on the basis of the most complete agrometeorological information in comparison with other studies. The article presents the results of assessing the soil vulnerability (predisposition or susceptibility) of agricultural lands to droughts in the region of Belarusian Polesye. To determine the degree of its manifestation, it is proposed to use such soil-hydrological constants of soil moisture availability as maximum field capacity moisture, rupture of capillary bonds and dynamics of change in their indicators during the growing season (April–October) over a 30-year period (1989–2018). The series of digital maps of the vulnerability of agricultural land use soils to droughts at the level of the region, administrative districts and individual agricultural organizations was compiled using the GIS technologies. The grouping of the administrative regions of Belarusian Polesye according to the ratio of agricultural land areas with varying degrees of soil vulnerability to droughts was carried out in order to develop territorially differentiated measures for adaptation and mitigation of their negative impact on agroecosystems. The obtained research results have found practical application in the development of measures to mitigate the negative impact of soil droughts on agricultural production. It is concluded that in the context of an increase in the number and duration of atmospheric droughts in the region, the need to apply the results of assessing the vulnerability of soils to their adverse effects is mandatory when substantiating and applying measures to adapt agricultural activities to mitigate the negative effects of droughts.
{"title":"Assessment and intra-regional differences in the soil vulnerability of the agricultural lands of Belarussian Polesye to droughts under warming climate","authors":"A. Chervan, V. Melnik, V. Yatsukhno","doi":"10.29235/1561-8323-2022-66-4-444-453","DOIUrl":"https://doi.org/10.29235/1561-8323-2022-66-4-444-453","url":null,"abstract":"A quantitative assessment of the areas of vulnerable soils to droughts was presented for the first time and a series of maps was compiled to identify soils of agricultural lands in the zone of the most pronounced risk on the basis of the most complete agrometeorological information in comparison with other studies. The article presents the results of assessing the soil vulnerability (predisposition or susceptibility) of agricultural lands to droughts in the region of Belarusian Polesye. To determine the degree of its manifestation, it is proposed to use such soil-hydrological constants of soil moisture availability as maximum field capacity moisture, rupture of capillary bonds and dynamics of change in their indicators during the growing season (April–October) over a 30-year period (1989–2018). The series of digital maps of the vulnerability of agricultural land use soils to droughts at the level of the region, administrative districts and individual agricultural organizations was compiled using the GIS technologies. The grouping of the administrative regions of Belarusian Polesye according to the ratio of agricultural land areas with varying degrees of soil vulnerability to droughts was carried out in order to develop territorially differentiated measures for adaptation and mitigation of their negative impact on agroecosystems. The obtained research results have found practical application in the development of measures to mitigate the negative impact of soil droughts on agricultural production. It is concluded that in the context of an increase in the number and duration of atmospheric droughts in the region, the need to apply the results of assessing the vulnerability of soils to their adverse effects is mandatory when substantiating and applying measures to adapt agricultural activities to mitigate the negative effects of droughts.","PeriodicalId":41825,"journal":{"name":"DOKLADY NATSIONALNOI AKADEMII NAUK BELARUSI","volume":" ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43211908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-07DOI: 10.29235/1561-8323-2022-66-4-391-396
V. Korzyuk, O. Kovnatskaya, V. A. Sevastyuk
A classical solution of the problem for a quasilinear hyperbolic equation in the case of two independent variables with given conditions for the desired function on the characteristic lines is obtained. The problem is reduced to a system of equations with a completely continuous operator. We constructed the unique solution by the method of successive approximations and showed the necessary and sufficient smoothness and matching conditions on given functions.
{"title":"Goursat’s problem on the plane for a quasilinear hyperbolic equation","authors":"V. Korzyuk, O. Kovnatskaya, V. A. Sevastyuk","doi":"10.29235/1561-8323-2022-66-4-391-396","DOIUrl":"https://doi.org/10.29235/1561-8323-2022-66-4-391-396","url":null,"abstract":"A classical solution of the problem for a quasilinear hyperbolic equation in the case of two independent variables with given conditions for the desired function on the characteristic lines is obtained. The problem is reduced to a system of equations with a completely continuous operator. We constructed the unique solution by the method of successive approximations and showed the necessary and sufficient smoothness and matching conditions on given functions.","PeriodicalId":41825,"journal":{"name":"DOKLADY NATSIONALNOI AKADEMII NAUK BELARUSI","volume":" ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46636950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-01DOI: 10.29235/1561-8323-2022-66-3-330-337
П. Титов, М. О. Трусевич, Ю. Л. Горбич, Academician Leonid P. Titov, Margarita O. Trusevich, Yury L. Gorbich
Sepsis still represents one of the leading causes of death in hospitalized patients worldwide, and its incidence is increasing. Changes in the relative and absolute blood levels of monocytes, dendritic cells, myeloid suppressor cells, and regulatory T-lymphocytes in the blood of patients with sepsis and septic shock were studied on the 3rd–4th day after diagnosis in order to identify the stage of immunosuppression. 33 patients with sepsis (19 men and 14 women, age 57.1 ± 19.9 years) and 6 patients with septic shock (2 men and 4 women, age 49.3 ± 19.6 years) were examined. The control group included 30 healthy donors. Subpopulations of monocytes, dendritic cells, myeloid suppressor cells, and Treg cells were determined by flow cytometry. A significant decrease in HLA-DR expression on monocytes, a decrease in the relative content of classical monocytes, myeloid and plasmacytoid dendritic cells, an increase in the percentage of intermediate monocytes and G-MLSC CD15+, an increase in the absolute content of Treg cells in patients with sepsis and septic shock were revealed. The revealed functional defects and shifts in the composition of the leukocyte population indicate the development of the stage of immunosuppression in patients with sepsis.
{"title":"Role of the cells of the system of mononuclear phagocytes and regulatory T-lymphocytes in the formation of the state of immunosuppression in sepsis","authors":"П. Титов, М. О. Трусевич, Ю. Л. Горбич, Academician Leonid P. Titov, Margarita O. Trusevich, Yury L. Gorbich","doi":"10.29235/1561-8323-2022-66-3-330-337","DOIUrl":"https://doi.org/10.29235/1561-8323-2022-66-3-330-337","url":null,"abstract":"Sepsis still represents one of the leading causes of death in hospitalized patients worldwide, and its incidence is increasing. Changes in the relative and absolute blood levels of monocytes, dendritic cells, myeloid suppressor cells, and regulatory T-lymphocytes in the blood of patients with sepsis and septic shock were studied on the 3rd–4th day after diagnosis in order to identify the stage of immunosuppression. 33 patients with sepsis (19 men and 14 women, age 57.1 ± 19.9 years) and 6 patients with septic shock (2 men and 4 women, age 49.3 ± 19.6 years) were examined. The control group included 30 healthy donors. Subpopulations of monocytes, dendritic cells, myeloid suppressor cells, and Treg cells were determined by flow cytometry. A significant decrease in HLA-DR expression on monocytes, a decrease in the relative content of classical monocytes, myeloid and plasmacytoid dendritic cells, an increase in the percentage of intermediate monocytes and G-MLSC CD15+, an increase in the absolute content of Treg cells in patients with sepsis and septic shock were revealed. The revealed functional defects and shifts in the composition of the leukocyte population indicate the development of the stage of immunosuppression in patients with sepsis.","PeriodicalId":41825,"journal":{"name":"DOKLADY NATSIONALNOI AKADEMII NAUK BELARUSI","volume":" ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42944369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-01DOI: 10.29235/1561-8323-2022-66-3-321-329
K. Kantor, I. Proskurnina, N. Sverchkova, E. Kolomiets
Antimicrobial metabolites of bacterial strain B. amyloliquefaciens BIM B-1125, the basis of Bacto-health preparation, demonstrating antagonism against the representatives of the opportunistic microbiota of valuable fish species, were isolated and characterized. Extracellular localization of antimicrobial compounds was established; their stability is shown in the temperature range of 50–100 °С and in the pH range of 2–10. The lipopeptide nature of antimicrobial metabolites was shown using thin layer chromatography. The mass spectrometric analysis of the active fraction confirmed the production of lipopeptide metabolites belonging to the iturin and surfactin families (iturin A, iturin A4, iturin A6-A7 isomers, surfactin A, surfactin C, and surfactin B isomers).
菌株B. amyloliquefaciens BIM B-1125的抗菌代谢物是Bacto-health制剂的基础，对有价值的鱼类的机会性微生物群的代表进行了拮抗，并进行了分离和表征。建立了抗菌化合物的细胞外定位;温度范围为50-100°С， pH值范围为2-10。用薄层色谱法分析了抗菌代谢产物的脂肽性质。活性组分的质谱分析证实了脂肽代谢产物属于iturin和surfactin家族(iturin A, iturin A4, iturin A6-A7异构体，surfactin A, surfactin C和surfactin B异构体)。
{"title":"Analysis of antimicrobial metabolites of bacteria Bacillus amyloliquefaciens BIM B-1125 – the basis of Baсto-health biological preparation","authors":"K. Kantor, I. Proskurnina, N. Sverchkova, E. Kolomiets","doi":"10.29235/1561-8323-2022-66-3-321-329","DOIUrl":"https://doi.org/10.29235/1561-8323-2022-66-3-321-329","url":null,"abstract":"Antimicrobial metabolites of bacterial strain B. amyloliquefaciens BIM B-1125, the basis of Bacto-health preparation, demonstrating antagonism against the representatives of the opportunistic microbiota of valuable fish species, were isolated and characterized. Extracellular localization of antimicrobial compounds was established; their stability is shown in the temperature range of 50–100 °С and in the pH range of 2–10. The lipopeptide nature of antimicrobial metabolites was shown using thin layer chromatography. The mass spectrometric analysis of the active fraction confirmed the production of lipopeptide metabolites belonging to the iturin and surfactin families (iturin A, iturin A4, iturin A6-A7 isomers, surfactin A, surfactin C, and surfactin B isomers).","PeriodicalId":41825,"journal":{"name":"DOKLADY NATSIONALNOI AKADEMII NAUK BELARUSI","volume":" ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45036168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-01DOI: 10.29235/1561-8323-2022-66-3-365-376
V. Zhornik, T. F. Grigoreva, S. Kovaliova, T. Y. Kiseleva, E. Devyatkina, S. Vosmerikov, I. S. Veremey, N. Lyakhov
The processes of mechanochemical reduction of oxides of iron, nickel, and copper with aluminum with a stoichio metric ratio of components and in mixtures with a two-, three-, and four-fold excess of the aluminum content over the stoichiometric, as well as in the presence of an excess of oxide-forming metal and solid solutions of aluminum in iron and copper, were studied by the Mössbauer and IR spectroscopy, X-ray diffraction analysis, including the use of synchrotron radiation, and electron microscopy. The conditions for formation of metals modified with aluminum oxide (iron, nickel, copper) and their monoaluminides are determined. High aluminum content aluminides are formed at a three-fold excess of aluminum, and at a four-fold excess, a mechanochemical reduction of oxides does not occur. The preferred method for modifying metals with alumina is the mechanochemical reduction of oxides with a solid solution of aluminum in the oxideforming metal. Mechanochemical interaction in the high-energy Hf–C system in the presence of 20, 30, and 50 wt. % copper leads to the formation of hafnium carbide; and with an increase in the copper content, the crystallite size decreases.
{"title":"Mechanically stimulated reactions in metal–oxide (carbide) systems","authors":"V. Zhornik, T. F. Grigoreva, S. Kovaliova, T. Y. Kiseleva, E. Devyatkina, S. Vosmerikov, I. S. Veremey, N. Lyakhov","doi":"10.29235/1561-8323-2022-66-3-365-376","DOIUrl":"https://doi.org/10.29235/1561-8323-2022-66-3-365-376","url":null,"abstract":"The processes of mechanochemical reduction of oxides of iron, nickel, and copper with aluminum with a stoichio metric ratio of components and in mixtures with a two-, three-, and four-fold excess of the aluminum content over the stoichiometric, as well as in the presence of an excess of oxide-forming metal and solid solutions of aluminum in iron and copper, were studied by the Mössbauer and IR spectroscopy, X-ray diffraction analysis, including the use of synchrotron radiation, and electron microscopy. The conditions for formation of metals modified with aluminum oxide (iron, nickel, copper) and their monoaluminides are determined. High aluminum content aluminides are formed at a three-fold excess of aluminum, and at a four-fold excess, a mechanochemical reduction of oxides does not occur. The preferred method for modifying metals with alumina is the mechanochemical reduction of oxides with a solid solution of aluminum in the oxideforming metal. Mechanochemical interaction in the high-energy Hf–C system in the presence of 20, 30, and 50 wt. % copper leads to the formation of hafnium carbide; and with an increase in the copper content, the crystallite size decreases.","PeriodicalId":41825,"journal":{"name":"DOKLADY NATSIONALNOI AKADEMII NAUK BELARUSI","volume":" ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42925407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-01DOI: 10.29235/1561-8323-2022-66-3-338-347
V. Loginov, I. Danilovich, L. V. Kitaev, E. M. Akent’eva
The article presents an assessment of current changes in air temperature, precipitation, snow and river runoff in the Baltic and Arctic Seas basins in the territories of Belarus and Russia. It is shown that the observed positive air temperature trends during the winter season are associated with the sea level pressure distribution in the North Atlantic and NAO indices. In summer, the temperature growth is correlated strongly with the Atlantic multi-decadal oscillation. Changes in the precipitation regime are synchronized with an increase in the sea level pressure in the baroclinic active zones of the Atlantic Ocean, which led to the precipitation increase in Europe since the second half of the 20th century. Interdecadal precipitation fluctuations in the study region are associated with the dynamics of the circumpolar vortex and Arctic oscillation (AO) indices. In winter, a precipitation increase is observed in the negative AO phase and is caused by an increase in the frequency of southern cyclones. In summer, when the AO phase is negative, the cyclonic activity decreases, and the precipitation growth is associated with convective processes in the atmosphere. Snow precipitation and snow water equivalent are decreasing during recent decades due the air temperature significant growth. That led to the spring floods height decreasing in the region. In the next 30 years, a decrease in the winter air temperature in the Baltic Sea basin and its increase in the Arctic Sea are expected. In summer, the air temperature increase will slow down on the descending AMO branch in the coming decades. In the precipitation regime, the growth of seasonal and daily total precipitation is expected.
{"title":"Current and projected hydroclimatic changes in the Baltic and Arctic sea basins in the territories of Belarus and Russia","authors":"V. Loginov, I. Danilovich, L. V. Kitaev, E. M. Akent’eva","doi":"10.29235/1561-8323-2022-66-3-338-347","DOIUrl":"https://doi.org/10.29235/1561-8323-2022-66-3-338-347","url":null,"abstract":" The article presents an assessment of current changes in air temperature, precipitation, snow and river runoff in the Baltic and Arctic Seas basins in the territories of Belarus and Russia. It is shown that the observed positive air temperature trends during the winter season are associated with the sea level pressure distribution in the North Atlantic and NAO indices. In summer, the temperature growth is correlated strongly with the Atlantic multi-decadal oscillation. Changes in the precipitation regime are synchronized with an increase in the sea level pressure in the baroclinic active zones of the Atlantic Ocean, which led to the precipitation increase in Europe since the second half of the 20th century. Interdecadal precipitation fluctuations in the study region are associated with the dynamics of the circumpolar vortex and Arctic oscillation (AO) indices. In winter, a precipitation increase is observed in the negative AO phase and is caused by an increase in the frequency of southern cyclones. In summer, when the AO phase is negative, the cyclonic activity decreases, and the precipitation growth is associated with convective processes in the atmosphere. Snow precipitation and snow water equivalent are decreasing during recent decades due the air temperature significant growth. That led to the spring floods height decreasing in the region. In the next 30 years, a decrease in the winter air temperature in the Baltic Sea basin and its increase in the Arctic Sea are expected. In summer, the air temperature increase will slow down on the descending AMO branch in the coming decades. In the precipitation regime, the growth of seasonal and daily total precipitation is expected.","PeriodicalId":41825,"journal":{"name":"DOKLADY NATSIONALNOI AKADEMII NAUK BELARUSI","volume":" ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43773850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-01DOI: 10.29235/1561-8323-2022-66-3-310-320
S. V. Sukhaveyeva, A. M. Kabachevskaya, I. Volotovski
The dynamics of the content of various groups of cell wall polysaccharides in the cells of tomato stems during the development of the plant’s response to gravitational stimulation and phytohormonal treatment was studied. It has been shown that gravitational stimulation causes changes in the relative content of stem cell wall polysaccharides in the zone of gravitropic bending over a period of 3–6 hours. At the same time, predominantly multidirectional changes occur in the upper and lower halves of the stem, which ultimately leads to noticeable biochemical differences between the two parts of the stem, which allows it, in all likelihood, to bend due to an uneven growth of cells in different parts of the stem. Under the action of gravitational stimulation and epibrassinosteroid epine, changes in the polysaccharide composition appear earlier (already 1 hour after exposure) in time than with a single gravitational stimulation, and under the influence of ethephon and gravitational stimulation later (only from 6 hours of exposure).
{"title":"Gravimetric analysis of tomato stems in the perception of a gravitational signal","authors":"S. V. Sukhaveyeva, A. M. Kabachevskaya, I. Volotovski","doi":"10.29235/1561-8323-2022-66-3-310-320","DOIUrl":"https://doi.org/10.29235/1561-8323-2022-66-3-310-320","url":null,"abstract":"The dynamics of the content of various groups of cell wall polysaccharides in the cells of tomato stems during the development of the plant’s response to gravitational stimulation and phytohormonal treatment was studied. It has been shown that gravitational stimulation causes changes in the relative content of stem cell wall polysaccharides in the zone of gravitropic bending over a period of 3–6 hours. At the same time, predominantly multidirectional changes occur in the upper and lower halves of the stem, which ultimately leads to noticeable biochemical differences between the two parts of the stem, which allows it, in all likelihood, to bend due to an uneven growth of cells in different parts of the stem. Under the action of gravitational stimulation and epibrassinosteroid epine, changes in the polysaccharide composition appear earlier (already 1 hour after exposure) in time than with a single gravitational stimulation, and under the influence of ethephon and gravitational stimulation later (only from 6 hours of exposure).","PeriodicalId":41825,"journal":{"name":"DOKLADY NATSIONALNOI AKADEMII NAUK BELARUSI","volume":"13 1","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69846512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-01DOI: 10.29235/1561-8323-2022-66-3-287-293
A. S. Logvinovich, T. V. Sviridova, E. Skorb, D. Sviridov, V. Agabekov
The container structures consisting of the core made of layered molybdenum oxide intercalated with 3-amono-1,2,4-triazole (it behaves as the corrosion inhibitor) capped with the shell made of polymerized tungsten oxide were synthesized employing the polycondensation of oxocompounds. It is shown that in the acid (pH < 5.5) and alkali (pH > 8.5) media, the coating continuity appears to be broken reversibly, which facilitates the emission of the encapsulated compounds from the containers. The intrinsic redox activity inherent into the oligooxometalate shell permits one to immobilize the synthesized containers by co-precipitation with galvanic nickel, whereas the possibility to open the container as a result of local pH value variations accompanying the corrosion process ensures the autonomic corrosion protection of the resultant metal-matrix coatings.
{"title":"Creating the рH-sensitive corrosion-inhibiting container structures based on the azole-intercalated molybdenum oxide particles with oligooxometalate shell","authors":"A. S. Logvinovich, T. V. Sviridova, E. Skorb, D. Sviridov, V. Agabekov","doi":"10.29235/1561-8323-2022-66-3-287-293","DOIUrl":"https://doi.org/10.29235/1561-8323-2022-66-3-287-293","url":null,"abstract":"The container structures consisting of the core made of layered molybdenum oxide intercalated with 3-amono-1,2,4-triazole (it behaves as the corrosion inhibitor) capped with the shell made of polymerized tungsten oxide were synthesized employing the polycondensation of oxocompounds. It is shown that in the acid (pH < 5.5) and alkali (pH > 8.5) media, the coating continuity appears to be broken reversibly, which facilitates the emission of the encapsulated compounds from the containers. The intrinsic redox activity inherent into the oligooxometalate shell permits one to immobilize the synthesized containers by co-precipitation with galvanic nickel, whereas the possibility to open the container as a result of local pH value variations accompanying the corrosion process ensures the autonomic corrosion protection of the resultant metal-matrix coatings.","PeriodicalId":41825,"journal":{"name":"DOKLADY NATSIONALNOI AKADEMII NAUK BELARUSI","volume":" ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43531978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-01DOI: 10.29235/1561-8323-2022-66-3-348-355
M. Al-Kamali, A. Boika, H. A. Al-Shamiri
Studies of the structure formation features of composite inorganic materials formed on the basis of silicon dioxide, namely, pyrogenic silica of the A-380 brand (technical name – aerosil). The main purpose of the research was to study the possibility of improving the uniformity of the distribution of injected dopants on the surface of SiO2 globules forming the xerogel framework. This goal was achieved due to the uniformity of the distribution of alloying salts (for example, copper nitrate) at the stage of sol formation, which was converted to the state of xerogel as a result of sequential heat treatment in a controlled gas environment (air or dried hydrogen). The final shape of the samples was either micro-powders or tabletshaped blanks obtained on their basis – with a diameter of about 12.5; 2.50; 30; 40 and 80 mm and a phase composition of SiO2 : CuO and SiO2 : Cu°.
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