D. Malencic, G. Malidža, M. Rajkovic, Biljana Kiprovski, S. Djuric, K. Petrović, J. Krstić
Flame-weeding is a very useful method for weed control, especially in organic production where the use of herbicides is prohibited. With this method heat sup?presses weeds in row within a second. Apart from this, heat also affects growing crop plants and surrounding soil. The aim of this paper was to determine the effect of different propane doses, on photosynthetic and polyphenolic (total flavonoids and anthocy?nins) pigments in soybean leaves, as well as the number of microorganisms in the soil. Soybean plants exposed to flame showed a different reaction to high temperature stress, which was reflected in differ?ent content of analyzed biochemical parameters, but the most responsive were anthocyanins. Actinomycetes turned out to be the most sensitive group of soil microorganisms affected by weed flaming, while fungi were the most tolerant.
{"title":"Flame-weeding: Impact on soybean plants and soil microorganisms","authors":"D. Malencic, G. Malidža, M. Rajkovic, Biljana Kiprovski, S. Djuric, K. Petrović, J. Krstić","doi":"10.2298/ZMSPN2039051M","DOIUrl":"https://doi.org/10.2298/ZMSPN2039051M","url":null,"abstract":"Flame-weeding is a very useful method for weed control, especially in organic production where the use of herbicides is prohibited. With this method heat sup?presses weeds in row within a second. Apart from this, heat also affects growing crop plants and surrounding soil. The aim of this paper was to determine the effect of different propane doses, on photosynthetic and polyphenolic (total flavonoids and anthocy?nins) pigments in soybean leaves, as well as the number of microorganisms in the soil. Soybean plants exposed to flame showed a different reaction to high temperature stress, which was reflected in differ?ent content of analyzed biochemical parameters, but the most responsive were anthocyanins. Actinomycetes turned out to be the most sensitive group of soil microorganisms affected by weed flaming, while fungi were the most tolerant.","PeriodicalId":30148,"journal":{"name":"Zbornik Matice Srpske za Prirodne Nauke","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68372923","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. Štrbac, M. Kašanin-Grubin, G. Gajica, J. Mutić, N. Vasić
The sequential extraction procedure was applied for partitioning of metals in river sediments collected along the course of the river Tisa (Serbia). Eight elements (Sb, Sn, As, Cd, Cu, Hg, Pb and Zn) from twenty-one sampling site were analyzed using the modified BCR sequential extraction procedure in combination with ICP-OES. The results of sequential extraction, statistical analyses and calculation of EF and lithogenic and anthro?pogenic ratio of metals are similar. In the river Tisa sediments Sn, Cd, Hg, Pb and Zn are of anthropogenic origin, while As, Cu and Sb are of lithogenic and anthropogenic origin. The sediments from the river Tisa show high risk for Cd, medium risk for Hg and Zn, low risk for Sn, As, Cu and Pb, whereas Sb does not show the risk for the aquatic environment.
{"title":"Sequential extraction studies on the river Tisa sediments for the assessment of the metal pollution","authors":"S. Štrbac, M. Kašanin-Grubin, G. Gajica, J. Mutić, N. Vasić","doi":"10.2298/ZMSPN2039089S","DOIUrl":"https://doi.org/10.2298/ZMSPN2039089S","url":null,"abstract":"The sequential extraction procedure was applied for partitioning of metals in river sediments collected along the course of the river Tisa (Serbia). Eight elements (Sb, Sn, As, Cd, Cu, Hg, Pb and Zn) from twenty-one sampling site were analyzed using the modified BCR sequential extraction procedure in combination with ICP-OES. The results of sequential extraction, statistical analyses and calculation of EF and lithogenic and anthro?pogenic ratio of metals are similar. In the river Tisa sediments Sn, Cd, Hg, Pb and Zn are of anthropogenic origin, while As, Cu and Sb are of lithogenic and anthropogenic origin. The sediments from the river Tisa show high risk for Cd, medium risk for Hg and Zn, low risk for Sn, As, Cu and Pb, whereas Sb does not show the risk for the aquatic environment.","PeriodicalId":30148,"journal":{"name":"Zbornik Matice Srpske za Prirodne Nauke","volume":"1 1","pages":"89-98"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68373251","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}
Irena Rakic, G. Dimić, M. Škrinjar, S. Kocić-Tanackov
In this study, moulds and mycotoxins presence in different tree nuts were investigated. The results showed that all of the 25 samples were contaminated with moulds. Mean values of total mould count varied from 1-4.9 cfu per grain. The most frequent species in hazelnut samples were Rhizopus oryzae (32.2%) and Aspergillus niger (28.9%). In walnuts A. niger (75.6%), in cashews also A. niger (42.4%) while in pistachio samples Alternaria alternata (20.7%), and Cladosporium cladosporioides (20.7%) were the most dominant. Rhizopus oligosporus was the only identified species in all almond samples (100%). Using Enzyme Linked Immunosorbent Assay (ELISA), the presence of total aflatoxins and ochratoxin A was examinated. In all analyzed samples, levels of ochratoxin A were below the limit of detection. Total aflatoxins were detected only in walnut samples with average concentration of 7.1 ?g/kg.
{"title":"Aflatoxigenic and ochratoxigenic moulds and their toxins in tree nuts on Serbian market","authors":"Irena Rakic, G. Dimić, M. Škrinjar, S. Kocić-Tanackov","doi":"10.2298/ZMSPN2039009R","DOIUrl":"https://doi.org/10.2298/ZMSPN2039009R","url":null,"abstract":"In this study, moulds and mycotoxins presence in different tree nuts were investigated. The results showed that all of the 25 samples were contaminated with moulds. Mean values of total mould count varied from 1-4.9 cfu per grain. The most frequent species in hazelnut samples were Rhizopus oryzae (32.2%) and Aspergillus niger (28.9%). In walnuts A. niger (75.6%), in cashews also A. niger (42.4%) while in pistachio samples Alternaria alternata (20.7%), and Cladosporium cladosporioides (20.7%) were the most dominant. Rhizopus oligosporus was the only identified species in all almond samples (100%). Using Enzyme Linked Immunosorbent Assay (ELISA), the presence of total aflatoxins and ochratoxin A was examinated. In all analyzed samples, levels of ochratoxin A were below the limit of detection. Total aflatoxins were detected only in walnut samples with average concentration of 7.1 ?g/kg.","PeriodicalId":30148,"journal":{"name":"Zbornik Matice Srpske za Prirodne Nauke","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68372636","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}
R. Pivić, Z. Dinić, J. Maksimović, D. Poštić, R. Štrbanović, A. Stanojković-Sebić
The aim of this paper is to investigate the contribution of the influence of organic matter and clay content on the value of maximum permissible concentrations (MPC) of trace elements Pb, Ni, Cr, and Cd. The investigation was conducted on agricul?tural soil in the territory of Veliko Gradiste Municipality. There were analyzed 82 samples of eutric cambisol type soil, 17 samples of chernozem soil, and 32 samples of sandy soil. In the composite soil samples, taken from a depth of 0-30 cm, main parameters of soil fertility (pH, P2O5, K2O, CaCO3, soil organic matter - SOM), the content of the clay frac?tion, and total forms of Pb, Ni, Cr, and Cd were determined. Interpretation of the obtained results was carried out in relation to the MPC of trace elements defined in the Regulations (Official Gazette, 88/2018). Based on the ratio of the defined MPC and corrected values whose calculation includes the values of the organic matter and clay content, there was determined the correlation concerning the content of organic matter and the content of clay fractions, respectively, in the tested samples. In addition, the content of Cr and Pb in tested types of soil still did not exceed the adjusted MPC value. As for Cd and Ni, there was no deviation from the established and modified values of MPC. Concludingly, the research should be continued and supplemented by data for other types of soils, which would represent a base for a further assessment of the applicability of the existing regulations taken from Dutch sources and incorporated into Serbian Regulations (Official Gazette, 88/2018).
{"title":"Evaluation of trace elements MPC in agricultural soil using organic matter and clay content","authors":"R. Pivić, Z. Dinić, J. Maksimović, D. Poštić, R. Štrbanović, A. Stanojković-Sebić","doi":"10.2298/zmspn2038097p","DOIUrl":"https://doi.org/10.2298/zmspn2038097p","url":null,"abstract":"The aim of this paper is to investigate the contribution of the influence of organic matter and clay content on the value of maximum permissible concentrations (MPC) of trace elements Pb, Ni, Cr, and Cd. The investigation was conducted on agricul?tural soil in the territory of Veliko Gradiste Municipality. There were analyzed 82 samples of eutric cambisol type soil, 17 samples of chernozem soil, and 32 samples of sandy soil. In the composite soil samples, taken from a depth of 0-30 cm, main parameters of soil fertility (pH, P2O5, K2O, CaCO3, soil organic matter - SOM), the content of the clay frac?tion, and total forms of Pb, Ni, Cr, and Cd were determined. Interpretation of the obtained results was carried out in relation to the MPC of trace elements defined in the Regulations (Official Gazette, 88/2018). Based on the ratio of the defined MPC and corrected values whose calculation includes the values of the organic matter and clay content, there was determined the correlation concerning the content of organic matter and the content of clay fractions, respectively, in the tested samples. In addition, the content of Cr and Pb in tested types of soil still did not exceed the adjusted MPC value. As for Cd and Ni, there was no deviation from the established and modified values of MPC. Concludingly, the research should be continued and supplemented by data for other types of soils, which would represent a base for a further assessment of the applicability of the existing regulations taken from Dutch sources and incorporated into Serbian Regulations (Official Gazette, 88/2018).","PeriodicalId":30148,"journal":{"name":"Zbornik Matice Srpske za Prirodne Nauke","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68372840","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 : 2019-09-30DOI: 10.1177/2168479019874059
Russell Reeve, Klaus Gottlieb
Background: Cohen's kappa is a statistic that estimates interobserver agreement. It was originally introduced to help develop diagnostic tests. Interpretative readings of 2 observers, for example, of a mammogram or other imaging, were compared at a single point in time. It is known that kappa depends on the prevalence of disease and that, therefore, kappas across different settings are hard to compare.
Methods: Using simulation, we examine an analogous situation, not previously described, that occurs in clinical trials where sequential measurements are obtained to evaluate disease progression or clinical improvement over time.
Results: We show that weighted kappa, used for multilevel outcomes, changes during the trial even if we keep the performance of the observer constant.
Conclusions: Kappa and closely related measures can therefore only be used with great difficulty, if at all, in quality assurance in clinical trials.
背景科恩卡帕（Cohen's kappa）是一种估算观察者间一致性的统计量。它最初是用来帮助开发诊断测试的。例如，在一个时间点上比较两个观察者对乳房 X 光或其他成像的解释性读数。众所周知，kappa 取决于疾病的发病率，因此不同环境下的 kappa 很难进行比较：方法：通过模拟，我们研究了一种以前未曾描述过的类似情况，这种情况发生在临床试验中，通过连续测量来评估疾病随时间的进展或临床改善情况：结果：我们发现，即使观察者的表现保持不变，用于多层次结果的加权卡帕在试验过程中也会发生变化：因此，Kappa 和与之密切相关的测量方法即使能用于临床试验的质量保证，也只能在非常困难的情况下使用。
{"title":"Sequentially Determined Measures of Interobserver Agreement (Kappa) in Clinical Trials May Vary Independent of Changes in Observer Performance.","authors":"Russell Reeve, Klaus Gottlieb","doi":"10.1177/2168479019874059","DOIUrl":"10.1177/2168479019874059","url":null,"abstract":"<p><strong>Background: </strong>Cohen's kappa is a statistic that estimates interobserver agreement. It was originally introduced to help develop diagnostic tests. Interpretative readings of 2 observers, for example, of a mammogram or other imaging, were compared at a single point in time. It is known that kappa depends on the prevalence of disease and that, therefore, kappas across different settings are hard to compare.</p><p><strong>Methods: </strong>Using simulation, we examine an analogous situation, not previously described, that occurs in clinical trials where sequential measurements are obtained to evaluate disease progression or clinical improvement over time.</p><p><strong>Results: </strong>We show that weighted kappa, used for multilevel outcomes, changes during the trial even if we keep the performance of the observer constant.</p><p><strong>Conclusions: </strong>Kappa and closely related measures can therefore only be used with great difficulty, if at all, in quality assurance in clinical trials.</p>","PeriodicalId":30148,"journal":{"name":"Zbornik Matice Srpske za Prirodne Nauke","volume":"1 1","pages":"2168479019874059"},"PeriodicalIF":1.5,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90334867","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}
Goran Tmusic, M. Rat, B. Bokić, Boris Đ. Radak, M. Radanović, G. Anačkov
Given the long and continuous history of human settlements on the territory of Novi Sad, the human impact on the Danube?s coast configuration has been significant. Based on the field research and literature data regarding the Danube?s shoreline, from Cerevic to Cortanovci, a total number of 440 taxa classified into 224 genera and 68 families were registered. According to the number of species, the most abundant families were Asteraceae (51), Poaceae (49), Fabaceae (32) and Brassicaceae (28), while the most abundant genera were Carex (15), Rumex (10) and Euphorbia (8). Chorological analysis showed that 42% of the registered taxa belong to Eurasian floral element, 14% to Central European and 12% to Pontic-Southsiberian floral element, with special attention to alien plants with invasive character that included 24 taxa. The analysis of the life forms showed domination of hemicryptophytes (40%), followed by therophytes (27%) and phanerophytes (11%).
{"title":"Floristic analysis of the Danube’s shoreline from Cerevic to Cortanovci","authors":"Goran Tmusic, M. Rat, B. Bokić, Boris Đ. Radak, M. Radanović, G. Anačkov","doi":"10.2298/zmspn1936133t","DOIUrl":"https://doi.org/10.2298/zmspn1936133t","url":null,"abstract":"Given the long and continuous history of human settlements on the territory of Novi Sad, the human impact on the Danube?s coast configuration has been significant. Based on the field research and literature data regarding the Danube?s shoreline, from Cerevic to Cortanovci, a total number of 440 taxa classified into 224 genera and 68 families were registered. According to the number of species, the most abundant families were Asteraceae (51), Poaceae (49), Fabaceae (32) and Brassicaceae (28), while the most abundant genera were Carex (15), Rumex (10) and Euphorbia (8). Chorological analysis showed that 42% of the registered taxa belong to Eurasian floral element, 14% to Central European and 12% to Pontic-Southsiberian floral element, with special attention to alien plants with invasive character that included 24 taxa. The analysis of the life forms showed domination of hemicryptophytes (40%), followed by therophytes (27%) and phanerophytes (11%).","PeriodicalId":30148,"journal":{"name":"Zbornik Matice Srpske za Prirodne Nauke","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68371358","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}
Irregular galaxies are considered to be results of collisions or close approaches between galaxies. In the local universe, determining the morphological type and collision stage does not pose a problem. However, when it comes to galaxies at high redshifts, determining morphology is non-trivial. In this paper, the morphological parameters used to determine the morphology of galaxies at large redshifts will be summarised and described in detail. The aim of this research is to examine the sensitivity of morphological parameters at different collision stages on galaxies in the Local Universe, so that the most sensitive parameter can be found and later applied to the study of collisions between distant galaxies.
{"title":"Examining the morphology of galaxies at high redshifts","authors":"Nikola Radulovic, Marina Pavlovic, T. Prodanovic","doi":"10.2298/zmspn1937023r","DOIUrl":"https://doi.org/10.2298/zmspn1937023r","url":null,"abstract":"Irregular galaxies are considered to be results of collisions or close approaches between galaxies. In the local universe, determining the morphological type and collision stage does not pose a problem. However, when it comes to galaxies at high redshifts, determining morphology is non-trivial. In this paper, the morphological parameters used to determine the morphology of galaxies at large redshifts will be summarised and described in detail. The aim of this research is to examine the sensitivity of morphological parameters at different collision stages on galaxies in the Local Universe, so that the most sensitive parameter can be found and later applied to the study of collisions between distant galaxies.","PeriodicalId":30148,"journal":{"name":"Zbornik Matice Srpske za Prirodne Nauke","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68371870","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}
Č. Radenović, G. Maksimov, O. Slatinskaya, F. Protopopov, N. Delić, J. Pavlov, A. Popović, M. Sečanski
The nature, role, and significance of low intensity spectral bands con?tained within the infrared spectra of kernels of high-yielding maize hybrids: ZP 341, ZP 434, and ZP 505 were observed in this study. The observations were performed to identify or?ganic molecules and their structural properties. The occurrence of unstable state of organic compounds and their functional groups are conditioned by such a process. The set hypoth?esis holds that there is a necessity to study the existence of many and low intensity spectral bands, not observed so far, occurring in different patterns (low intensity bands, single or grouped). They should be observed and the dynamics of their formation, caused by their different movements, including the possibility of their cancellation or amplification, should be explained. Such spectral bands most often appear in the wave number range of 400-950 cm-1. They occur in several wave numbers up to 3,000 cm-1 and are caused by different types of vibration movements (valence and deformation vibrations) of organic compounds and their functional groups: primary, secondary, and tertiary amides, proteins, free amino acids, alkanes, alkenes, aldehydes, ketones, aromatic compounds, cellulose, carbohydrates, car?boxylic acids, ethers, and alcohols. An unbiased analysis of low intensity spectral bands of maize hybrid kernels reveals that their occurrence is similar. Small differences, for some cases of the occurrence of low intensity spectral bands, can barely be ascertained. In this way, it is possible to establish not only the chemical composition of organic compounds of kernels of observed maize hybrids, but also it is possible to indicate their unstable, confor?mational, and functional properties.
{"title":"Study of the low intensity spectral bands within the infrared spectra of kernels of high-yielding maize hybrids","authors":"Č. Radenović, G. Maksimov, O. Slatinskaya, F. Protopopov, N. Delić, J. Pavlov, A. Popović, M. Sečanski","doi":"10.2298/zmspn1936033r","DOIUrl":"https://doi.org/10.2298/zmspn1936033r","url":null,"abstract":"The nature, role, and significance of low intensity spectral bands con?tained within the infrared spectra of kernels of high-yielding maize hybrids: ZP 341, ZP 434, and ZP 505 were observed in this study. The observations were performed to identify or?ganic molecules and their structural properties. The occurrence of unstable state of organic compounds and their functional groups are conditioned by such a process. The set hypoth?esis holds that there is a necessity to study the existence of many and low intensity spectral bands, not observed so far, occurring in different patterns (low intensity bands, single or grouped). They should be observed and the dynamics of their formation, caused by their different movements, including the possibility of their cancellation or amplification, should be explained. Such spectral bands most often appear in the wave number range of 400-950 cm-1. They occur in several wave numbers up to 3,000 cm-1 and are caused by different types of vibration movements (valence and deformation vibrations) of organic compounds and their functional groups: primary, secondary, and tertiary amides, proteins, free amino acids, alkanes, alkenes, aldehydes, ketones, aromatic compounds, cellulose, carbohydrates, car?boxylic acids, ethers, and alcohols. An unbiased analysis of low intensity spectral bands of maize hybrid kernels reveals that their occurrence is similar. Small differences, for some cases of the occurrence of low intensity spectral bands, can barely be ascertained. In this way, it is possible to establish not only the chemical composition of organic compounds of kernels of observed maize hybrids, but also it is possible to indicate their unstable, confor?mational, and functional properties.","PeriodicalId":30148,"journal":{"name":"Zbornik Matice Srpske za Prirodne Nauke","volume":"94 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68371036","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}
E. Vaštag, R. Kastori, S. Orlović, Mirjana Bojović, A. Kesić, L. Pap, M. S. Stojnic
The aim of the present study was to evaluate the effect of one of the most important foliar diseases, powdery mildew, on the leaf physiological traits of Quercus robur L. using chlorophyll a fluorescence parameters in combination with parameters of leaf gas exchange. For this purpose, greenhouse semi-controlled experiment was conducted with 25 one-year-old seedlings kept in optimal conditions, and the same number of seedlings infected with the mentioned pathogen. Measurements were carried out when the coverage of epiphytic micelia visually reached more than 75% of the surface of leaves in the infected seedlings. The results of gas exchange measurement showed that Erysiphe alphitoides (Griffon and Maubl.) U. Braun and S. Takam caused a significant reduction of net photosynthesis (A) and a significant increase in substomatal CO2 concentration (Ci). Furthermore, considering the fast kinetics of chlorophyll a fluorescence, all of the observes parameters were significantly affected by oak powdery mildew. On the other hand, pulse amplitude modulated fluorescence parameters were mildly affected, with only minimal (Fo?) and maximal (Fm?) fluorescence of dark adopted leaves showing significant difference. This study presented the possibility of usage and the effectiveness of chlorophyll a fluorescence parameters in detection the severe stress conditions, on the example of leaves infected with oak powdery mildew over 75%. Some additional studies should be conducted in the future to determine the possibility of usage and the effectiveness of the observed fluorescence parameters of fast kinetics in detection of mild and early stress.
利用叶绿素a荧光参数结合叶片气体交换参数，研究了白粉病对栎树叶片生理性状的影响。为此，在温室半对照试验中，选取25株1年生苗木，保持在最优条件下，接种相同数量的苗木感染上述病原菌。当附生胶束目测覆盖率达到叶片表面75%以上时进行测量。气体交换测定结果表明，黄芪(Griffon and Maubl.)U. Braun和S. Takam导致净光合作用(a)显著降低，气孔下CO2浓度(Ci)显著增加。此外，考虑到叶绿素a荧光的快速动力学，所有观测参数都受到橡树白粉病的显著影响。另一方面，脉冲振幅调制的荧光参数受影响较小，暗采叶片只有最小荧光(Fo?)和最大荧光(Fm?)存在显著差异。以75%以上的栎树白粉病叶片为例，研究了叶绿素a荧光参数在严重胁迫条件下检测的可行性和有效性。未来还需要进行更多的研究，以确定所观察到的快速动力学荧光参数在轻度和早期应激检测中的应用可能性和有效性。
{"title":"Effects of oak powdery mildew (Erysiphe alphitoides [Griffon and Maubl.] U. Braun and S. Takam.) on photosynthesis of pedunculate oak (Quercus robur L.)","authors":"E. Vaštag, R. Kastori, S. Orlović, Mirjana Bojović, A. Kesić, L. Pap, M. S. Stojnic","doi":"10.2298/zmspn1936043v","DOIUrl":"https://doi.org/10.2298/zmspn1936043v","url":null,"abstract":"The aim of the present study was to evaluate the effect of one of the most important foliar diseases, powdery mildew, on the leaf physiological traits of Quercus robur L. using chlorophyll a fluorescence parameters in combination with parameters of leaf gas exchange. For this purpose, greenhouse semi-controlled experiment was conducted with 25 one-year-old seedlings kept in optimal conditions, and the same number of seedlings infected with the mentioned pathogen. Measurements were carried out when the coverage of epiphytic micelia visually reached more than 75% of the surface of leaves in the infected seedlings. The results of gas exchange measurement showed that Erysiphe alphitoides (Griffon and Maubl.) U. Braun and S. Takam caused a significant reduction of net photosynthesis (A) and a significant increase in substomatal CO2 concentration (Ci). Furthermore, considering the fast kinetics of chlorophyll a fluorescence, all of the observes parameters were significantly affected by oak powdery mildew. On the other hand, pulse amplitude modulated fluorescence parameters were mildly affected, with only minimal (Fo?) and maximal (Fm?) fluorescence of dark adopted leaves showing significant difference. This study presented the possibility of usage and the effectiveness of chlorophyll a fluorescence parameters in detection the severe stress conditions, on the example of leaves infected with oak powdery mildew over 75%. Some additional studies should be conducted in the future to determine the possibility of usage and the effectiveness of the observed fluorescence parameters of fast kinetics in detection of mild and early stress.","PeriodicalId":30148,"journal":{"name":"Zbornik Matice Srpske za Prirodne Nauke","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68371126","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}
Far infrared-radio correlation represents a linear relationship between far-infrared (FIR) and radio emission in star-forming galaxies. Previous observations have confirmed that this correlation is maintained over a large range of redshift and does not evolve, although a small dispersion is present. However, some of more recent observations at high redshift have shown the opposite. The question that arises is - what is driving this evolution? In this paper we investigate the possibility that galaxy morphology is the answer to this question. A sample of 37 submillimeter galaxies (SMGs) is analyzed. The observation and morphological class of these galaxies has previously been published. We examined FIR-radio correlation in galaxies of different morphological type in this sample and found that for star-forming disk galaxies correlation is stable and does not evolve and for irregular and interacting galaxies we find some hints of evolution.
{"title":"What is driving the evolution of the far-infrared radio correlation?","authors":"Marina Pavlovic, T. Prodanovic","doi":"10.2298/zmspn1937009p","DOIUrl":"https://doi.org/10.2298/zmspn1937009p","url":null,"abstract":"Far infrared-radio correlation represents a linear relationship between far-infrared (FIR) and radio emission in star-forming galaxies. Previous observations have confirmed that this correlation is maintained over a large range of redshift and does not evolve, although a small dispersion is present. However, some of more recent observations at high redshift have shown the opposite. The question that arises is - what is driving this evolution? In this paper we investigate the possibility that galaxy morphology is the answer to this question. A sample of 37 submillimeter galaxies (SMGs) is analyzed. The observation and morphological class of these galaxies has previously been published. We examined FIR-radio correlation in galaxies of different morphological type in this sample and found that for star-forming disk galaxies correlation is stable and does not evolve and for irregular and interacting galaxies we find some hints of evolution.","PeriodicalId":30148,"journal":{"name":"Zbornik Matice Srpske za Prirodne Nauke","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68371809","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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