Slaviša Đukanović, V. Mladenović, Milan Gligorijevic, Danijela Milošević, Ivona Radojević-Aleksić
This paper deals with the general technical, spatial, and temporal characteristics of satellite telecommunications systems. Particular attention was paid to the peculiarities of the territory of the Republic of Serbia in terms of implementation and use of modern satellite telecommunication infrastructure. The overview shows how and on which way to use various satellite telecommunication systems to configure and exploit next-generation networks, especially modern communications such as 5G technology and IoT. Their work cannot be imagined without the high speeds and high frequencies that allow us to transmit a wealth of information - from short messages/news to HD video on a mobile phone. We need either a base station network or in the case of the high seas or areas where the base station system is difficult to imagine, we need satellite communication. The paper presents data that give a numerical and graphical overview of geostationary satellites visible from the territory of the city of Belgrade, depending on the orbital position and the associated angle of azimuth and elevation, which would also be valid for the leading territory of Serbia.
{"title":"SPATIAL CHARACTERIZATION OF TELECOMMUNICATION SATELLITES VISIBLE ABOVE THE REPUBLIC OF SERBIA","authors":"Slaviša Đukanović, V. Mladenović, Milan Gligorijevic, Danijela Milošević, Ivona Radojević-Aleksić","doi":"10.5937/univtho10-27731","DOIUrl":"https://doi.org/10.5937/univtho10-27731","url":null,"abstract":"This paper deals with the general technical, spatial, and temporal characteristics of satellite telecommunications systems. Particular attention was paid to the peculiarities of the territory of the Republic of Serbia in terms of implementation and use of modern satellite telecommunication infrastructure. The overview shows how and on which way to use various satellite telecommunication systems to configure and exploit next-generation networks, especially modern communications such as 5G technology and IoT. Their work cannot be imagined without the high speeds and high frequencies that allow us to transmit a wealth of information - from short messages/news to HD video on a mobile phone. We need either a base station network or in the case of the high seas or areas where the base station system is difficult to imagine, we need satellite communication. The paper presents data that give a numerical and graphical overview of geostationary satellites visible from the territory of the city of Belgrade, depending on the orbital position and the associated angle of azimuth and elevation, which would also be valid for the leading territory of Serbia.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89472521","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}
The existing territorial layout and the current demographic situation in the settlements of West Morava Valley District during the late 20th century and at the beginning of the 21st century are the result of the synchronized action of the process of industrialization, deagrarization and urbanization. They conditioned the selective transformation of urban and rural space, which led to the concentration of the population in urban and suburban settlements and the depopulation of the rural part of the West Morava Valley District. Within the studied region, the hierarchy of municipal centers, subcenters and communities of settlements was observed. Based on important theoretical and methodological assumptions and indicators, the paper analyzes the functional transformation of the settlements of West Morava Valley in the period between 1971- 2011. It was determined by certain quantitative methods that the changes went in the direction of reducing the share of purely agrarian settlements and increasing the share of industrial and service settlements.
{"title":"FUNCTIONAL TRANSFORMATION OF WEST MORAVA VALLEY DISTRICT SETTLEMENTS","authors":"Ivana Penjisevic, Jovan Dragojlović","doi":"10.5937/univtho10-29609","DOIUrl":"https://doi.org/10.5937/univtho10-29609","url":null,"abstract":"The existing territorial layout and the current demographic situation in the settlements of West Morava Valley District during the late 20th century and at the beginning of the 21st century are the result of the synchronized action of the process of industrialization, deagrarization and urbanization. They conditioned the selective transformation of urban and rural space, which led to the concentration of the population in urban and suburban settlements and the depopulation of the rural part of the West Morava Valley District. Within the studied region, the hierarchy of municipal centers, subcenters and communities of settlements was observed. Based on important theoretical and methodological assumptions and indicators, the paper analyzes the functional transformation of the settlements of West Morava Valley in the period between 1971- 2011. It was determined by certain quantitative methods that the changes went in the direction of reducing the share of purely agrarian settlements and increasing the share of industrial and service settlements.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"60 11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86797798","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}
Teacher competencies are among the key factors of a successful mathematics instruction. The main goal of the study was to compare teachers’ beliefs and attitudes affected by different strategies in organizing the instruction process. The study gives a comparison of teachers’ competencies in three groups of teachers – one teaching mathematics without ICT, the second using ready-made GeoGebra applets and the third one developing their own GeoGebra applets in cooperation with their students. The survey includes 65 mathematics teachers working in 21 primary and secondary schools in southern regions of Serbia. We observed, assessed and compared affectivemotivational characteristics of teachers – their beliefs and professional motivation. Results indicate that the teachers’ affective-motivational characteristics depend on the way they employ technology in representing the content they teach. If the technology is used in an inappropriate manner it can impede the students’ creativity, but it also obstructs teachers in deploying their full abilities in the process. The results also bring to the fore issues concerning ways to maintain positive effects achieved through ICT empowered instruction organized in the way the third group of teachers did.
{"title":"MATHEMATICS TEACHER’S PERCEPTIONS ABOUT INFLUENCE OF DIFFERENT ICT USAGE STRATEGIES ON THEIR COMPETENCIES","authors":"E. Ljajko","doi":"10.5937/univtho10-29584","DOIUrl":"https://doi.org/10.5937/univtho10-29584","url":null,"abstract":"Teacher competencies are among the key factors of a successful mathematics instruction. The main goal of the study was to compare teachers’ beliefs and attitudes affected by different strategies in organizing the instruction process. The study gives a comparison of teachers’ competencies in three groups of teachers – one teaching mathematics without ICT, the second using ready-made GeoGebra applets and the third one developing their own GeoGebra applets in cooperation with their students. The survey includes 65 mathematics teachers working in 21 primary and secondary schools in southern regions of Serbia. We observed, assessed and compared affectivemotivational characteristics of teachers – their beliefs and professional motivation. Results indicate that the teachers’ affective-motivational characteristics depend on the way they employ technology in representing the content they teach. If the technology is used in an inappropriate manner it can impede the students’ creativity, but it also obstructs teachers in deploying their full abilities in the process. The results also bring to the fore issues concerning ways to maintain positive effects achieved through ICT empowered instruction organized in the way the third group of teachers did.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"10 1","pages":"38-42"},"PeriodicalIF":0.0,"publicationDate":"2020-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44580204","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}
The study of the distribution of geometrical points, loaded by some scalars plays an important role in various fields of science, of theoretical and practical character. Since such study was first applied and studied when mass had the role of played a scalar, the mass loaded point was named material point, and the discipline dealing with the arrangement of material points in space is called the geometric mass. In that discipline, in the general case under mass one should imply a scalar of arbitrary nature, which can be negative as well. For example, the discipline includes the study of distribution of magnetic or electrical masses, which can be positive and negative. This paper presents some concepts from the geometry of masses that play an important role, particularly in mechanics and physics.
{"title":"SOME MATHEMATICAL CONCEPTS IN GEOMETRY OF MASSES","authors":"G. Jelić, D. Stošovic","doi":"10.5937/univtho10-26655","DOIUrl":"https://doi.org/10.5937/univtho10-26655","url":null,"abstract":"The study of the distribution of geometrical points, loaded by some scalars plays an important role in various fields of science, of theoretical and practical character. Since such study was first applied and studied when mass had the role of played a scalar, the mass loaded point was named material point, and the discipline dealing with the arrangement of material points in space is called the geometric mass. In that discipline, in the general case under mass one should imply a scalar of arbitrary nature, which can be negative as well. For example, the discipline includes the study of distribution of magnetic or electrical masses, which can be positive and negative. This paper presents some concepts from the geometry of masses that play an important role, particularly in mechanics and physics.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"135 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78096427","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}
Şentürk Fatih, Adar Gökhan, S. Panic, C. Stefanovic, Mete Yağanoğlu, Bojan Prilinčević
Covid-19 causes one of the most alarming global health and economic crises in modern times. Countries around the world establish different preventing measures to stop or control Covid-19 spread. The goal of this paper is to present methods for the evaluation of indoor air quality in public transport to assess the risk of contracting Covid-19. The first part of the paper involves investigating the relationship between Covid-19 and various factors affecting indoor air quality. The focus of this paper relies on exploring existing methods to estimate the number of occupants in public transport. It is known that increased occupancy rate increases the possibility of contamination as well as indoor carbon dioxide concentration. Wireless data collection schemes will be defined that can collect data from public transportation. Collected data are envisioned to be stored in the cloud for data analytics. We will present novel methods to analyze the collected data by considering the historical data and estimate the virus contagion risk level for each public transportation vehicle in service. The methodology is expected to be applicable for other airborne diseases as well. Real-time risk levels of public transportation vehicles will be available through a mobile application so that people can choose their mode of transportation accordingly.
{"title":"COVID-19 RISK ASSESSMENT IN PUBLIC TRANSPORT USING AMBIENT SENSOR DATA AND WIRELESS COMMUNICATIONS","authors":"Şentürk Fatih, Adar Gökhan, S. Panic, C. Stefanovic, Mete Yağanoğlu, Bojan Prilinčević","doi":"10.5937/univtho10-29239","DOIUrl":"https://doi.org/10.5937/univtho10-29239","url":null,"abstract":"Covid-19 causes one of the most alarming global health and economic crises in modern times. Countries around the world establish different preventing measures to stop or control Covid-19 spread. The goal of this paper is to present methods for the evaluation of indoor air quality in public transport to assess the risk of contracting Covid-19. The first part of the paper involves investigating the relationship between Covid-19 and various factors affecting indoor air quality. The focus of this paper relies on exploring existing methods to estimate the number of occupants in public transport. It is known that increased occupancy rate increases the possibility of contamination as well as indoor carbon dioxide concentration. Wireless data collection schemes will be defined that can collect data from public transportation. Collected data are envisioned to be stored in the cloud for data analytics. We will present novel methods to analyze the collected data by considering the historical data and estimate the virus contagion risk level for each public transportation vehicle in service. The methodology is expected to be applicable for other airborne diseases as well. Real-time risk levels of public transportation vehicles will be available through a mobile application so that people can choose their mode of transportation accordingly.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82946607","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}
Twenty years (1999 - 2019) after the end of the conflict in the Autonomous Province of Kosovo and Metohija, it can be stated that nowhere in Europe is there such ethnic segregation of the population as is the case with the AP of Kosovo and Metohija. Following the withdrawal of pumped security forces from the entire territory of Kosovo and Metohija and the entry of the United Nations peacekeeping force into the Serbian Autonomous Province, Kosovo Albanians carried out their persecution from Kosovo through terrorist attacks on Serbs and other non-Albanian populations (Montenegrins, Gorans, Roma, Ashkali) carried out their persecution from Kosovo and Metohija and fundamentally changed the ethnic structure of the Province. An insight into the majority of 223.081 exiles and displaced persons from Kosovo and Metohija indicates an exodus against the Serbs. The number of displaced Roma, Ashkali and Egyptians is estimated at about 100.000. The mass persecution of the Serb and other non-Albanian populations has resulted in tremendous changes in the ethnic structure of the Province, which today, with 93% of the total population, is dominated by Albanians, while other ethnic communities have a participation of 7%.
{"title":"CONTEMPORARY CHANGES IN THE ETHNIC STRUCTURE OF THE POPULATION IN THE AUTONOMOUS PROVINCE OF KOSOVO AND METOHIJA","authors":"Saša Milosavljević, Jovo Medojević","doi":"10.5937/UNIVTHO10-25625","DOIUrl":"https://doi.org/10.5937/UNIVTHO10-25625","url":null,"abstract":"Twenty years (1999 - 2019) after the end of the conflict in the Autonomous Province of Kosovo and Metohija, it can be stated that nowhere in Europe is there such ethnic segregation of the population as is the case with the AP of Kosovo and Metohija. Following the withdrawal of pumped security forces from the entire territory of Kosovo and Metohija and the entry of the United Nations peacekeeping force into the Serbian Autonomous Province, Kosovo Albanians carried out their persecution from Kosovo through terrorist attacks on Serbs and other non-Albanian populations (Montenegrins, Gorans, Roma, Ashkali) carried out their persecution from Kosovo and Metohija and fundamentally changed the ethnic structure of the Province. An insight into the majority of 223.081 exiles and displaced persons from Kosovo and Metohija indicates an exodus against the Serbs. The number of displaced Roma, Ashkali and Egyptians is estimated at about 100.000. The mass persecution of the Serb and other non-Albanian populations has resulted in tremendous changes in the ethnic structure of the Province, which today, with 93% of the total population, is dominated by Albanians, while other ethnic communities have a participation of 7%.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90722612","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}
L-ascorbic acid is one of the essential nutrients and most common food supplements, fortificants, and preservatives. It is commercially available as solutions, drops, tablets, capsules, crystal powder, beverage mixtures, multivitamin formulations, and multi antioxidant formulations. The usual daily dose is from 25 mg to 1.5 g. Ascorbic acid is a distinctly reducing agent with low redox potential (0.18 and 0.08 V at pH 4.5 and 6.4, respectively). Based on ascorbate property, numerous methods for its quantitative determination are developed, from titrimetric, electrochemical, and chromatographic methods, to fluorometric and kinetic ones. Enzyme peroxidase is interfered with by ascorbic acid, which decreases the oxidation speed of its co-substrates during hydrogen peroxide decomposition by peroxidase. Absorbance changes at the wavelength of corresponding reagents are in correlation with ascorbate concentration. During this study, benzidine and o-tolidine have been used as chromogenic reagents. Reaction conditions were optimized for various buffer systems, calibration curves were constructed, and limits of detection (0.04 μmol/L) and quantification (0.12 μmol/L) were calculated. Using calibration charts, it was possible to detect ascorbic acid within limits from 0.4 to 10 μmol/L. The optimized method was applied for the determination of ascorbic acid in pharmaceutical products. The method was characterized by exceptional sensitivity and accuracy, but only for preparations not containing substances that affect enzyme peroxidase.
l -抗坏血酸是一种必需营养素，也是最常见的食品补充剂、强化剂和防腐剂。它是商业上可用的溶液、滴剂、片剂、胶囊、结晶粉末、饮料混合物、多种维生素配方和多种抗氧化剂配方。通常每日剂量为25毫克至1.5克。抗坏血酸是一种明显的还原剂，具有较低的氧化还原电位(在pH为4.5和6.4时分别为0.18和0.08 V)。基于抗坏血酸的性质，从滴定法、电化学和色谱法到荧光法和动力学法，开发了许多定量测定方法。过氧化物酶受到抗坏血酸的干扰，在过氧化物酶分解过氧化氢的过程中，抗坏血酸降低了其共底物的氧化速度。相应试剂波长处吸光度变化与抗坏血酸浓度相关。本研究以联苯胺和邻甲苯胺为显色试剂。优化了不同缓冲体系的反应条件，建立了标定曲线，计算了检测限(0.04 μmol/L)和定量限(0.12 μmol/L)。通过校正图，可以在0.4 ~ 10 μmol/L范围内检测到抗坏血酸。该方法可用于药品中抗坏血酸的测定。该方法具有特殊的灵敏度和准确性，但仅适用于不含影响酶过氧化物酶的物质的制剂。
{"title":"SPECTROPHOTOMETRIC DETERMINATION OF ASCORBIC ACID BY HORSERADISH PEROXIDASE","authors":"Vladimir Đurić, N. Deletic","doi":"10.5937/univtho10-27576","DOIUrl":"https://doi.org/10.5937/univtho10-27576","url":null,"abstract":"L-ascorbic acid is one of the essential nutrients and most common food supplements, fortificants, and preservatives. It is commercially available as solutions, drops, tablets, capsules, crystal powder, beverage mixtures, multivitamin formulations, and multi antioxidant formulations. The usual daily dose is from 25 mg to 1.5 g. Ascorbic acid is a distinctly reducing agent with low redox potential (0.18 and 0.08 V at pH 4.5 and 6.4, respectively). Based on ascorbate property, numerous methods for its quantitative determination are developed, from titrimetric, electrochemical, and chromatographic methods, to fluorometric and kinetic ones. Enzyme peroxidase is interfered with by ascorbic acid, which decreases the oxidation speed of its co-substrates during hydrogen peroxide decomposition by peroxidase. Absorbance changes at the wavelength of corresponding reagents are in correlation with ascorbate concentration. During this study, benzidine and o-tolidine have been used as chromogenic reagents. Reaction conditions were optimized for various buffer systems, calibration curves were constructed, and limits of detection (0.04 μmol/L) and quantification (0.12 μmol/L) were calculated. Using calibration charts, it was possible to detect ascorbic acid within limits from 0.4 to 10 μmol/L. The optimized method was applied for the determination of ascorbic acid in pharmaceutical products. The method was characterized by exceptional sensitivity and accuracy, but only for preparations not containing substances that affect enzyme peroxidase.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89702210","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 information about morphological variability and sex dimorphism of the Noble crayfish (Astacus astacus) in the area of the Balkana Lake in Mrkonjic Grad. The crayfish were caught by hand made baited traps from October 9nd 2018. until May 31th 2019. A total of 58 crayfish were caught, of which 38 males and 20 females. The eight morphometric characteristics: body weight (W), body length (TBL), claw length (CLL), cephalothorax length (CFL), carapace width (CPW), abdomen length (ABL), rostrum length (ROL) and rostrum width (ROW) were measured, both in males and females. Also, the body condition was determined for all specimens. The results of morphometric characteristics partially matched into the already known range of variations. These data represent first ones for the observed area. The t-test showed that there were significant differences between the sexes in W, TBL, CLL, CFL and CPW which are explained by the emphasized sex dimorphism of the noble crayfish.
{"title":"MORPHOLOGICAL VARIABILITY AND SEXUAL DIMORPHISM OF NOBLE CRAYFISH Astacus astacus FROM THE BALKANA LAKE","authors":"R. Roljić, V. Nikolić, N. Savić","doi":"10.5937/univtho10-23098","DOIUrl":"https://doi.org/10.5937/univtho10-23098","url":null,"abstract":"This paper presents the information about morphological variability and sex dimorphism of the Noble crayfish (Astacus astacus) in the area of the Balkana Lake in Mrkonjic Grad. The crayfish were caught by hand made baited traps from October 9nd 2018. until May 31th 2019. A total of 58 crayfish were caught, of which 38 males and 20 females. The eight morphometric characteristics: body weight (W), body length (TBL), claw length (CLL), cephalothorax length (CFL), carapace width (CPW), abdomen length (ABL), rostrum length (ROL) and rostrum width (ROW) were measured, both in males and females. Also, the body condition was determined for all specimens. The results of morphometric characteristics partially matched into the already known range of variations. These data represent first ones for the observed area. The t-test showed that there were significant differences between the sexes in W, TBL, CLL, CFL and CPW which are explained by the emphasized sex dimorphism of the noble crayfish.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89785638","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}
The aim of this study was to determine the effect of lead, nickel and cadmium on the germination of barley seeds (Hordeum vulgare L.) of Jadran variety. Based on the percentage of germination, germination energy, and root and hypocotyl length, authors done an analysis of the effects of PbCl2, NiCl2, CdCl2 solutions, in concentrations of 103 mol/m3, 102 mol/m3, 10 mol/m3, 1 mol/m3, 10 -1 mol/m3, 10-2 mol/m3. The results showed that germination and germgrowthin stress conditions which are caused by heavy metals depend on the type of metal and its concentrations. The most toxic effect of alltested solutions had CdCl2, and the weakest toxic effect had PbCl2.
{"title":"IMPACT OF PB, NI AND CD ON THE GERMINATION OF BARLEY SEEDS, VARIETY JADRAN","authors":"P. Vasić, T. Jakšić, G. Đelić","doi":"10.5937/univtho10-23916","DOIUrl":"https://doi.org/10.5937/univtho10-23916","url":null,"abstract":"The aim of this study was to determine the effect of lead, nickel and cadmium on the germination of barley seeds (Hordeum vulgare L.) of Jadran variety. Based on the percentage of germination, germination energy, and root and hypocotyl length, authors done an analysis of the effects of PbCl2, NiCl2, CdCl2 solutions, in concentrations of 103 mol/m3, 102 mol/m3, 10 mol/m3, 1 mol/m3, 10 -1 mol/m3, 10-2 mol/m3. The results showed that germination and germgrowthin stress conditions which are caused by heavy metals depend on the type of metal and its concentrations. The most toxic effect of alltested solutions had CdCl2, and the weakest toxic effect had PbCl2.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87572233","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 deals with investigations of elemental concentrations and soil-to-moss transfer factors of radionuclides in area of municipalities Kosovska Mitrovica and Zubin Potok. Twelve samples of soil and moss Hypnum cupressiforme Hedw. were collected during May 2018. Transfer factors of radionuclides: 226Ra, 232Th, 40Kand 137Cs were calculated with regard to elemental concentrations of radionuclides in soil and moss samples. Analysis was done in order to indicate the different ways of adopting radionuclides by mosses. According to calculated transfer factors and analysis, authors concluded that the soil is dominant source of natural radionuclides and their concentration in moss occurred due to resuspension of soil particles, while artificial 137Cs is present in soil and moss samples as a consequence of atmospheric dry and wet deposition.
{"title":"ELEMENTAL CONCENTRATIONS AND SOIL-TO-MOSS TRANSFER FACTORS OF RADIONUCLIDES IN THE ENVIRONMENT OF NORTH KOSOVO AND METOHIJA","authors":"L. Gulan, T. Jakšić, B. Milenkovic, J. Stajic","doi":"10.5937/univtho10-27949","DOIUrl":"https://doi.org/10.5937/univtho10-27949","url":null,"abstract":"This paper deals with investigations of elemental concentrations and soil-to-moss transfer factors of radionuclides in area of municipalities Kosovska Mitrovica and Zubin Potok. Twelve samples of soil and moss Hypnum cupressiforme Hedw. were collected during May 2018. Transfer factors of radionuclides: 226Ra, 232Th, 40Kand 137Cs were calculated with regard to elemental concentrations of radionuclides in soil and moss samples. Analysis was done in order to indicate the different ways of adopting radionuclides by mosses. According to calculated transfer factors and analysis, authors concluded that the soil is dominant source of natural radionuclides and their concentration in moss occurred due to resuspension of soil particles, while artificial 137Cs is present in soil and moss samples as a consequence of atmospheric dry and wet deposition.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81696672","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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