E. V. Zamenina, N. I. Panteleeva, I. Roshchevskaya
Morphological and functional differences in the heart, which have not resulted from a pathological process, do not cause specific changes in the traditional ECG, widely used for determining various functional disorders in the myocardium. The Body Surface Potential Mapping method (BSPM), known as noninvasive multichannel synchronous recording of electrical potentials of the heart on the thoracic surface from multiple unipolar leads, is a more informative method for studying the functional state of the heart, which makes it possible to obtain more data on the electrical processes in the myocardium compared to the standard electrocardiography. The aim of this research was to investigate the electrical activity of the human heart by the method of BSPM during the period of ventricular repolarization with acute normobaric hypoxia before and after a course of interval hypoxic training. The study population consisted of 14 practically healthy young men (19.7 ± 1.0 years , weight 74.4 ± 9.8 kg, height 177.2 ± 6.4 cm). All subjects gave information consent to participate in this study; study We studied the heart’s electrical activity in young men using traditional and multiple electrocardiography during the ventricle repolarization period of the heart to the acute normobaric hypoxia (gas mixture contains 12% of O 2 ) before and after a 19-day interval hypoxic training. BSPM with 64 unipolar leads covering the thorax was perfomed. Limb lead II was used as a reference. The electrodes located in the intercostal space on the torso with 3-5 cm distance were used. The electrodes were attached to 8 flexible strips each containing 8 electrodes. BSPM was recorded in the supine position at rest. We analyzed the amplitude characteristics of the positive and negative extrema (the amplitude of the maximum and the amplitude of the minimum, respectively) and the time they reach the maximum amplitudes at the period of the ventricular repolarization (the maximum time and the minimum time, respectively) ( See Fig. 1 ). In the initial state, at each minute of the acute hypoxia and the recovery period - normoxia (5 min) the heart rate (HR) and hemoglobin saturation (SpO 2 ) were measured in each subject by an oximeter (Nonin Medical Inc., USA). Systolic and diastolic blood pressure was registered by an automatic tonometer (OMRON, Japan). At each minute of the study, unipolar ECG from 64 electrodes located on the thorax surface was recorded. In limb lead II of ECG, the QT II , R-R II , J-Tpeak II and Tpeak-Tend II intervals were determined, the corrected QT interval (QTc) was calculated using the Bazett formula. The course of interval hypoxic training (IHT) consisted of 19 days of breathing with a hypoxic mixture with 10% oxygen content in the intermittent mode. The first day included 6 cycles (one cycle - 5 minutes of breathing with a hypoxic state. After hypoxic training, when exposed to acute hypoxia, the amplitude maximum and minimum decreased significantly (p<0.05). After
{"title":"The electrical activity of the human heart during ventricular repolarization under acute normobaric hypoxia before and after interval hypoxic training","authors":"E. V. Zamenina, N. I. Panteleeva, I. Roshchevskaya","doi":"10.17223/19988591/48/6","DOIUrl":"https://doi.org/10.17223/19988591/48/6","url":null,"abstract":"Morphological and functional differences in the heart, which have not resulted from a pathological process, do not cause specific changes in the traditional ECG, widely used for determining various functional disorders in the myocardium. The Body Surface Potential Mapping method (BSPM), known as noninvasive multichannel synchronous recording of electrical potentials of the heart on the thoracic surface from multiple unipolar leads, is a more informative method for studying the functional state of the heart, which makes it possible to obtain more data on the electrical processes in the myocardium compared to the standard electrocardiography. The aim of this research was to investigate the electrical activity of the human heart by the method of BSPM during the period of ventricular repolarization with acute normobaric hypoxia before and after a course of interval hypoxic training. The study population consisted of 14 practically healthy young men (19.7 ± 1.0 years , weight 74.4 ± 9.8 kg, height 177.2 ± 6.4 cm). All subjects gave information consent to participate in this study; study We studied the heart’s electrical activity in young men using traditional and multiple electrocardiography during the ventricle repolarization period of the heart to the acute normobaric hypoxia (gas mixture contains 12% of O 2 ) before and after a 19-day interval hypoxic training. BSPM with 64 unipolar leads covering the thorax was perfomed. Limb lead II was used as a reference. The electrodes located in the intercostal space on the torso with 3-5 cm distance were used. The electrodes were attached to 8 flexible strips each containing 8 electrodes. BSPM was recorded in the supine position at rest. We analyzed the amplitude characteristics of the positive and negative extrema (the amplitude of the maximum and the amplitude of the minimum, respectively) and the time they reach the maximum amplitudes at the period of the ventricular repolarization (the maximum time and the minimum time, respectively) ( See Fig. 1 ). In the initial state, at each minute of the acute hypoxia and the recovery period - normoxia (5 min) the heart rate (HR) and hemoglobin saturation (SpO 2 ) were measured in each subject by an oximeter (Nonin Medical Inc., USA). Systolic and diastolic blood pressure was registered by an automatic tonometer (OMRON, Japan). At each minute of the study, unipolar ECG from 64 electrodes located on the thorax surface was recorded. In limb lead II of ECG, the QT II , R-R II , J-Tpeak II and Tpeak-Tend II intervals were determined, the corrected QT interval (QTc) was calculated using the Bazett formula. The course of interval hypoxic training (IHT) consisted of 19 days of breathing with a hypoxic mixture with 10% oxygen content in the intermittent mode. The first day included 6 cycles (one cycle - 5 minutes of breathing with a hypoxic state. After hypoxic training, when exposed to acute hypoxia, the amplitude maximum and minimum decreased significantly (p<0.05). After","PeriodicalId":37153,"journal":{"name":"Vestnik Tomskogo Gosudarstvennogo Universiteta-Biologiya","volume":"117 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76311786","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}
This paper presents the result of the studies of soil formation on different aged coastal bars in the transgression zone of Lake Ladoga in the Nizhnesvirsky Nature Reserve (Leningrad region, North-West of the Russian Federation). The investigation presents the data on soil chronoseries, located on four Ladoga coastal bars of different ages from 70±25 to 1590±25 years BP. We estimated the trends of accumulation and transformation of organic matter, elemental composition of humic acids (HAs), development of plant communities and the influence of soil formation factors on the formation rate of soil horizons. We assessed the degree of soil organic matter stabilization using modern instrumental methods (spectroscopy of nuclear magnetic resonance CP/MAS 13C-NMR). An integral indicator of the hydrophobicity of HAs, which represents the total fraction of unoxidized carbon atoms, is proposed. The Ladoga Holocene transgression is one of the most informative and applicable models for pedogenesis; successional processes occurring in young and mature areas can be traced here. We identified local processes of soil formation such as podzolization, gleyfication, peat formation and humus accumulation. Physical, physical-chemical and biological soil properties with a detailed description of the morphology of soil of different aged coastal bars are presented.
{"title":"Podzol development on different aged coastal bars of Lake Ladoga","authors":"E. Abakumov, V. Polyakov, Ksenia Orlova","doi":"10.17223/19988591/48/1","DOIUrl":"https://doi.org/10.17223/19988591/48/1","url":null,"abstract":"This paper presents the result of the studies of soil formation on different aged coastal bars in the transgression zone of Lake Ladoga in the Nizhnesvirsky Nature Reserve (Leningrad region, North-West of the Russian Federation). The investigation presents the data on soil chronoseries, located on four Ladoga coastal bars of different ages from 70±25 to 1590±25 years BP. We estimated the trends of accumulation and transformation of organic matter, elemental composition of humic acids (HAs), development of plant communities and the influence of soil formation factors on the formation rate of soil horizons. We assessed the degree of soil organic matter stabilization using modern instrumental methods (spectroscopy of nuclear magnetic resonance CP/MAS 13C-NMR). An integral indicator of the hydrophobicity of HAs, which represents the total fraction of unoxidized carbon atoms, is proposed. The Ladoga Holocene transgression is one of the most informative and applicable models for pedogenesis; successional processes occurring in young and mature areas can be traced here. We identified local processes of soil formation such as podzolization, gleyfication, peat formation and humus accumulation. Physical, physical-chemical and biological soil properties with a detailed description of the morphology of soil of different aged coastal bars are presented.","PeriodicalId":37153,"journal":{"name":"Vestnik Tomskogo Gosudarstvennogo Universiteta-Biologiya","volume":"96 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74976595","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}
{"title":"Effect of ultrasound exposure duration on the state of microcirculation and hemostasis system in rats","authors":"Yu. A. Bondarchuk, M. Nosova, I. Shakhmatov","doi":"10.17223/19988591/48/5","DOIUrl":"https://doi.org/10.17223/19988591/48/5","url":null,"abstract":"","PeriodicalId":37153,"journal":{"name":"Vestnik Tomskogo Gosudarstvennogo Universiteta-Biologiya","volume":"1 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82485290","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}
{"title":"Hydrogen sulfide and plant adaptation to abiotic stressors","authors":"Yu. E. Kolupaev, T. Yastreb","doi":"10.17223/19988591/48/8","DOIUrl":"https://doi.org/10.17223/19988591/48/8","url":null,"abstract":"","PeriodicalId":37153,"journal":{"name":"Vestnik Tomskogo Gosudarstvennogo Universiteta-Biologiya","volume":"1 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74123695","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}
S. V. Pestov, Irina G. Tychinkina, S. Ogorodnikova
{"title":"The effect of gall mites on the condition of Tilia cordata assimilation apparatus","authors":"S. V. Pestov, Irina G. Tychinkina, S. Ogorodnikova","doi":"10.17223/19988591/44/11","DOIUrl":"https://doi.org/10.17223/19988591/44/11","url":null,"abstract":"","PeriodicalId":37153,"journal":{"name":"Vestnik Tomskogo Gosudarstvennogo Universiteta-Biologiya","volume":"17 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90648079","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}
Kristina A. Blashkova, Maria Yu. Lupinos, A. Ananin
eserve The research presents the results of investigating the ecological regularities of altitudinal-belt differentiation of the bird population in the Barguzin reserve. Studying the formation of bird fauna and population in the conditions of altitudinal zoning, as well as the factors influencing it, is one of the promising research areas in the Baikal region. The results of such work carried out in undisturbed reference areas can serve as a basis for assessing the size and direction of the natural structure variability of bird communities. The Barguzin State Natural Biosphere Reserve is located in the Northeast Baikal region. It is the oldest Nature Reserve in Russia, created in 1916. Located in undisturbed natural systems, this reserve reflects best global environmental changes. We collected data during expeditions in the summer 2014 on the territory of the reserve within the western slope of the Barguzin Range. The studies were conducted at key sites of the reserve in 5 altitudes: riverside plain (460-520 m asl and higher), foothill (520-630 m asl and higher), forest (630-1200 m asl and higher), subalpine (1200-1400 m asl and higher) and alpine (1400-2800 m asl and higher) in the valleys of three rivers. Ornithological surveys were carried out in the first half of summer, which corresponds to the nesting population of birds. When carrying out the research, we used the method of route counting of birds without limitation of the counting strip width, followed by recalculation to the area in terms of the bird detection range by the interval method (Ravkin Yu.S., 1967). The total length of the routes was 221 km, including the permanent route along the Davsha river valley - 62 km, along the Ezovka river valley - 69 km and the Bolshaya river valley-90 km. We analyzed the bird
{"title":"Regularities of altitudinal belt differentiation of the summer bird community in the Barguzin Nature Reserve","authors":"Kristina A. Blashkova, Maria Yu. Lupinos, A. Ananin","doi":"10.17223/19988591/44/4","DOIUrl":"https://doi.org/10.17223/19988591/44/4","url":null,"abstract":"eserve The research presents the results of investigating the ecological regularities of altitudinal-belt differentiation of the bird population in the Barguzin reserve. Studying the formation of bird fauna and population in the conditions of altitudinal zoning, as well as the factors influencing it, is one of the promising research areas in the Baikal region. The results of such work carried out in undisturbed reference areas can serve as a basis for assessing the size and direction of the natural structure variability of bird communities. The Barguzin State Natural Biosphere Reserve is located in the Northeast Baikal region. It is the oldest Nature Reserve in Russia, created in 1916. Located in undisturbed natural systems, this reserve reflects best global environmental changes. We collected data during expeditions in the summer 2014 on the territory of the reserve within the western slope of the Barguzin Range. The studies were conducted at key sites of the reserve in 5 altitudes: riverside plain (460-520 m asl and higher), foothill (520-630 m asl and higher), forest (630-1200 m asl and higher), subalpine (1200-1400 m asl and higher) and alpine (1400-2800 m asl and higher) in the valleys of three rivers. Ornithological surveys were carried out in the first half of summer, which corresponds to the nesting population of birds. When carrying out the research, we used the method of route counting of birds without limitation of the counting strip width, followed by recalculation to the area in terms of the bird detection range by the interval method (Ravkin Yu.S., 1967). The total length of the routes was 221 km, including the permanent route along the Davsha river valley - 62 km, along the Ezovka river valley - 69 km and the Bolshaya river valley-90 km. We analyzed the bird","PeriodicalId":37153,"journal":{"name":"Vestnik Tomskogo Gosudarstvennogo Universiteta-Biologiya","volume":"19 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74197849","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}
{"title":"Biology of dormancy and germination of Stellaria media (L.) Vill. and Stellaria nemorum L. seeds","authors":"K. Tkachenko","doi":"10.17223/19988591/44/2","DOIUrl":"https://doi.org/10.17223/19988591/44/2","url":null,"abstract":"","PeriodicalId":37153,"journal":{"name":"Vestnik Tomskogo Gosudarstvennogo Universiteta-Biologiya","volume":"94 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77663206","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}
{"title":"Structure of the living ground cover in pine forests on dumps of Kuzbass","authors":"V. Ufimtsev, T. O. Strelnikova, O. Kupriyanov","doi":"10.17223/19988591/44/3","DOIUrl":"https://doi.org/10.17223/19988591/44/3","url":null,"abstract":"","PeriodicalId":37153,"journal":{"name":"Vestnik Tomskogo Gosudarstvennogo Universiteta-Biologiya","volume":"115 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89562913","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}
T. Zamoshchina, T. Berdnikova, V. I. Otmakhov, E. S. Sheleg, E. Teplyakova
{"title":"Effect of Filipendula extract on the rhythmic organization of the daily dynamics of body temperature and behavioral activity in rats","authors":"T. Zamoshchina, T. Berdnikova, V. I. Otmakhov, E. S. Sheleg, E. Teplyakova","doi":"10.17223/19988591/44/8","DOIUrl":"https://doi.org/10.17223/19988591/44/8","url":null,"abstract":"","PeriodicalId":37153,"journal":{"name":"Vestnik Tomskogo Gosudarstvennogo Universiteta-Biologiya","volume":"41 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89220562","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}
{"title":"Dynamics of the state of Siberian fir tree stands damaged by the four-eyed fir bark beetle Polygraphus proximus Blandf. in Tomsk Oblast","authors":"E. M. Bisirova, S. Krivets","doi":"10.17223/19988591/44/7","DOIUrl":"https://doi.org/10.17223/19988591/44/7","url":null,"abstract":"","PeriodicalId":37153,"journal":{"name":"Vestnik Tomskogo Gosudarstvennogo Universiteta-Biologiya","volume":"11 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72733146","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}
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