The Experts below are selected from a list of 7506 Experts worldwide ranked by ideXlab platform
Carla Denise Bonan - One of the best experts on this subject based on the ideXlab platform.
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Tebuconazole alters morphological behavioral and neurochemical parameters in larvae and adult zebrafish danio rerio
Chemosphere, 2017Co-Authors: Stefani Altenhofen, Debora Dreher Nabinger, Melissa Talita Wiprich, Talita Carneiro Brandao Pereira, Mauricio Reis Bogo, Carla Denise BonanAbstract:In this study, we evaluated the effects of Tebuconazole on morphology and exploratory larvae behavior and adult locomotion. Furthermore, we analyzed the effects of this fungicide on AChE activity and gene expression in zebrafish larvae and in the adult zebrafish brain. Tebuconazole (4 mg/L) increased the ocular distance in larvae and reduced the distance travelled, absolute turn angle, line crossing and time outside area in exposed larvae. Moreover, adult zebrafish that were exposed to this fungicide (4 and 6 mg/L) showed a decrease in distance travelled and mean speed when compared to the control group. However, Tebuconazole did not alter the number of line crossings or time spent in the upper zone. Tebuconazole inhibited AChE activity at concentrations of 4 mg/L for larvae and 4 and 6 mg/L in the adult zebrafish brain. However, this fungicide did not alter AChE gene expression in the adult zebrafish brain but increased AChE mRNA transcript levels in larvae. These findings demonstrated that Tebuconazole could modulate the cholinergic system by altering AChE activity and that this change may be associated with the reduced locomotion of these animals.
Pedro N Carvalho - One of the best experts on this subject based on the ideXlab platform.
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removal of the pesticide Tebuconazole in constructed wetlands design comparison influencing factors and modelling
Environmental Pollution, 2018Co-Authors: Tao Lyu, Liang Zhang, Carlos A Arias, Hans Brix, Pedro N CarvalhoAbstract:Constructed wetlands (CWs) are a promising technology to treat pesticide contaminated water, but its implementation is impeded by lack of data to optimize designs and operating factors. Unsaturated and saturated CW designs were used to compare the removal of triazole pesticide, Tebuconazole, in unplanted mesocosms and mesocosms planted with five different plant species: Typha latifolia, Phragmites australis, Iris pseudacorus, Juncus effusus and Berula erecta. Tebuconazole removal efficiencies were significantly higher in unsaturated CWs than saturated CWs, showing for the first time the potential of unsaturated CWs to treat Tebuconazole contaminated water. An artificial neural network model was demonstrated to provide more accurate predictions of Tebuconazole removal than the traditional linear regression model. Also, Tebuconazole removal could be fitted an area-based first order kinetics model in both CW designs. The removal rate constants were consistently higher in unsaturated CWs (range of 2.6–10.9 cm d−1) than in saturated CWs (range of 1.7–7.9 cm d−1) and higher in planted CWs (range of 3.1–10.9 cm d−1) than in unplanted CWs (range of 1.7–2.6 cm d−1) for both designs. The low levels of sorption of Tebuconazole to the substrate (0.7–2.1%) and plant phytoaccumulation (2.5–12.1%) indicate that the major removal pathways were biodegradation and metabolization inside the plants after plant uptake. The main factors influencing Tebuconazole removal in the studied systems were system design, hydraulic loading rate and plant presence. Moreover, Tebuconazole removal was positively correlated to dissolved oxygen and all nutrients removal.
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enantioselective uptake translocation and degradation of the chiral pesticides Tebuconazole and imazalil by phragmites australis
Environmental Pollution, 2017Co-Authors: Pedro N Carvalho, Carlos A Arias, Hans Brix, Monica Escola Casas, Ulla E Bollmann, Kai BesterAbstract:Abstract Phytoremediation of realistic environmental concentrations (10 μg L −1 ) of the chiral pesticides Tebuconazole and imazalil by Phragmites australis was investigated. This study focussed on removal dynamics, enantioselective mechanisms and transformation products (TPs) in both hydroponic growth solutions and plant tissues. For the first time, we documented uptake, translocation and metabolisation of these pesticides inside wetland plants, using enantioselective analysis. Tebuconazole and imazalil removal efficiencies from water reached 96.1% and 99.8%, respectively, by the end of the experiment (day 24). Removal from the solutions could be described by first-order removal kinetics with removal rate constants of 0.14 d −1 for Tebuconazole and 0.31 d −1 for imazalil. Removal of the pesticides from the hydroponic solution, plant uptake, within plant translocation and degradation occurred simultaneously. Tebuconazole and imazalil concentrations inside Phragmites peaked at day 10 and 5d, respectively, and decreased thereafter. TPs of Tebuconazole i.e., (5-(4-Chlorophenyl)-2,2-dimethyl-3-(1H-1,2,4-triazol-1-ylmethyl)-1,3-pentanediol and 5-(3-((1H-1,2,4-Triazol-1-yl)methyl)-3-hydroxy-4,4-dimethylpentyl)-2-chlorophenol) were quantified in solution, while the imazalil TPs (α-(2,4-Dichlorophenyl)-1H-imidazole-1-ethanol and 3-[1-(2,4-Dichlorophenyl)-2-(1H-imidazol-1-yl)ethoxy]-1,2-propanediol) were quantified in both solution and plant tissue. Pesticide uptake by Phragmites was positively correlated with evapotranspiration. Pesticide removal from the hydroponic solution was not enantioselective. However, Tebuconazole was degraded enantioselectively both in the roots and shoots. Imazalil translocation and degradation inside Phragmites were also enantioselective: R -imazalil translocated faster than S -imazalil.
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phytoremediation of imazalil and Tebuconazole by four emergent wetland plant species in hydroponic medium
Chemosphere, 2016Co-Authors: Tao Lv, Carlos A Arias, Pedro N Carvalho, Yang Zhang, Monica Escola Casas, Kai Bester, Hans BrixAbstract:Abstract Pollution from pesticide residues in aquatic environments is of increasing concern. Imazalil and Tebuconazole, two commonly used systemic pesticides, are water contaminants that can be removed by constructed wetlands. However, the phytoremediation capability of emergent wetland plants for imazalil and Tebuconazole, especially the removal mechanisms involved, is poorly understood. This study compared the removal of both pesticides by four commonly used wetland plants, Typha latifolia , Phragmites australis , Iris pseudacorus and Juncus effusus , and aimed to understand the removal mechanisms involved. The plants were individually exposed to an initial concentration of 10 mg/L in hydroponic solution. At the end of the 24-day study period, the Tebuconazole removal efficiencies were relatively lower (25%–41%) than those for imazalil (46%–96%) for all plant species studied. The removal of imazalil and Tebuconazole fit a first-order kinetics model, with the exception of Tebuconazole removal in solutions with I. pseudacorus . Changes in the enantiomeric fraction for imazalil and Tebuconazole were detected in plant tissue but not in the hydroponic solutions; thus, the translocation and degradation processes were enantioselective in the plants. At the end of the study period, the accumulation of imazalil and Tebuconazole in plant tissue was relatively low and constituted 2.8–14.4% of the total spiked pesticide in each vessel. Therefore, the studied plants were able to not only take up the pesticides but also metabolise them.
Minghua Wang - One of the best experts on this subject based on the ideXlab platform.
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Stereoselective degradation of flutriafol and Tebuconazole in grape.
Environmental Science and Pollution Research, 2014Co-Authors: Qing Zhang, Xiude Hua, Yu Yang, Wei Yin, Mingming Tian, Haiyan Shi, Minghua WangAbstract:The stereoselective dissipation of flutriafol and Tebuconazole in grape had been studied. A simple and sensitive method for determination of flutriafol and Tebuconazole enantiomers in grape was developed by high-performance liquid chromatography on a cellulose tris(3-chloro-4-methylphenylcarbamate) column. The limits of quantification for flutriafol and Tebuconazole in grape were 0.033 and 0.043 mg kg−1, respectively. The dissipations of flutriafol and Tebuconazole stereoisomers in grape followed first-order kinetics (R2 > 0.93). The stereoisomers of flutriafol and Tebuconazole were enantioselectively degraded in grape, and Tebuconazole was more enantioselective than flutriafol. The half-life of (−)-Tebuconazole was 5.2 days and shorter than (+)-Tebuconazole with half-life of 6.4 days. The (−)-flutriafol was also preferentially degraded in grape, the half-lives of which were 6.59 and 6.98 days for (−) and (+)-flutriafol, respectively. The enantiomeric ratio value of the two fungicides was nearly 1.0 at the 1st day and increased to 1.143 for flutriafol and 2.015 for Tebuconazole at the 28th day. The stereoselective dissipations could provide a reference to fully evaluate the risks of two important chiral triazole fungicides.
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analysis of Tebuconazole and tetraconazole enantiomers by chiral hplc ms ms and application to measure enantioselective degradation in strawberries
Food Analytical Methods, 2012Co-Authors: Hu Zhang, Xinquan Wang, Xiangyun Wang, Mingrong Qian, Qiang Wang, Minghua WangAbstract:A rapid and sensitive enantioselective method for the determination of Tebuconazole and tetraconazole enantiomers in strawberry has been developed. The enantiomers were resolved by high-performance liquid chromatography on a cellulose tris (3-chloro-4-methylphenylcarbamate) (Lux Cellulose-2) column using methanol–0.1% formic acid solution (70:30, v/v) as mobile phase. The chiral liquid chromatographic separation was combined with an extract/cleanup procedure known as the quick, easy, cheap, effective, rugged, and safe (QuEChERS) method. High-performance liquid chromatography-tandem mass spectrometry with electrospray ionization was then used for qualitative and quantitative determination of the enantiomers of Tebuconazole and tetraconazole. Hexaconazole was used as an internal standard. The method provided high selectivity and sensitivity, and the limits of quantification for Tebuconazole and tetraconazole enantiomers in strawberry were both 2.5 μg/kg. The method was successfully utilized to investigate the probable enantioselective degradation of Tebuconazole and tetraconazole in strawberry. The results showed that the degradation of the Tebuconazole and tetraconazole enantiomers in strawberry followed first-order kinetics (R 2 > 0.96). The results from this study revealed the degradation of tetraconazole in strawberry was not enantioselective, while the degradation of Tebuconazole was enantioselective, and the (+)-Tebuconazole showed a faster degradation than (−)-Tebuconazole in strawberry. The results could provide a reference to fully evaluate risks of these two fungicides.
Hans Brix - One of the best experts on this subject based on the ideXlab platform.
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removal of the pesticide Tebuconazole in constructed wetlands design comparison influencing factors and modelling
Environmental Pollution, 2018Co-Authors: Tao Lyu, Liang Zhang, Carlos A Arias, Hans Brix, Pedro N CarvalhoAbstract:Constructed wetlands (CWs) are a promising technology to treat pesticide contaminated water, but its implementation is impeded by lack of data to optimize designs and operating factors. Unsaturated and saturated CW designs were used to compare the removal of triazole pesticide, Tebuconazole, in unplanted mesocosms and mesocosms planted with five different plant species: Typha latifolia, Phragmites australis, Iris pseudacorus, Juncus effusus and Berula erecta. Tebuconazole removal efficiencies were significantly higher in unsaturated CWs than saturated CWs, showing for the first time the potential of unsaturated CWs to treat Tebuconazole contaminated water. An artificial neural network model was demonstrated to provide more accurate predictions of Tebuconazole removal than the traditional linear regression model. Also, Tebuconazole removal could be fitted an area-based first order kinetics model in both CW designs. The removal rate constants were consistently higher in unsaturated CWs (range of 2.6–10.9 cm d−1) than in saturated CWs (range of 1.7–7.9 cm d−1) and higher in planted CWs (range of 3.1–10.9 cm d−1) than in unplanted CWs (range of 1.7–2.6 cm d−1) for both designs. The low levels of sorption of Tebuconazole to the substrate (0.7–2.1%) and plant phytoaccumulation (2.5–12.1%) indicate that the major removal pathways were biodegradation and metabolization inside the plants after plant uptake. The main factors influencing Tebuconazole removal in the studied systems were system design, hydraulic loading rate and plant presence. Moreover, Tebuconazole removal was positively correlated to dissolved oxygen and all nutrients removal.
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enantioselective uptake translocation and degradation of the chiral pesticides Tebuconazole and imazalil by phragmites australis
Environmental Pollution, 2017Co-Authors: Pedro N Carvalho, Carlos A Arias, Hans Brix, Monica Escola Casas, Ulla E Bollmann, Kai BesterAbstract:Abstract Phytoremediation of realistic environmental concentrations (10 μg L −1 ) of the chiral pesticides Tebuconazole and imazalil by Phragmites australis was investigated. This study focussed on removal dynamics, enantioselective mechanisms and transformation products (TPs) in both hydroponic growth solutions and plant tissues. For the first time, we documented uptake, translocation and metabolisation of these pesticides inside wetland plants, using enantioselective analysis. Tebuconazole and imazalil removal efficiencies from water reached 96.1% and 99.8%, respectively, by the end of the experiment (day 24). Removal from the solutions could be described by first-order removal kinetics with removal rate constants of 0.14 d −1 for Tebuconazole and 0.31 d −1 for imazalil. Removal of the pesticides from the hydroponic solution, plant uptake, within plant translocation and degradation occurred simultaneously. Tebuconazole and imazalil concentrations inside Phragmites peaked at day 10 and 5d, respectively, and decreased thereafter. TPs of Tebuconazole i.e., (5-(4-Chlorophenyl)-2,2-dimethyl-3-(1H-1,2,4-triazol-1-ylmethyl)-1,3-pentanediol and 5-(3-((1H-1,2,4-Triazol-1-yl)methyl)-3-hydroxy-4,4-dimethylpentyl)-2-chlorophenol) were quantified in solution, while the imazalil TPs (α-(2,4-Dichlorophenyl)-1H-imidazole-1-ethanol and 3-[1-(2,4-Dichlorophenyl)-2-(1H-imidazol-1-yl)ethoxy]-1,2-propanediol) were quantified in both solution and plant tissue. Pesticide uptake by Phragmites was positively correlated with evapotranspiration. Pesticide removal from the hydroponic solution was not enantioselective. However, Tebuconazole was degraded enantioselectively both in the roots and shoots. Imazalil translocation and degradation inside Phragmites were also enantioselective: R -imazalil translocated faster than S -imazalil.
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phytoremediation of imazalil and Tebuconazole by four emergent wetland plant species in hydroponic medium
Chemosphere, 2016Co-Authors: Tao Lv, Carlos A Arias, Pedro N Carvalho, Yang Zhang, Monica Escola Casas, Kai Bester, Hans BrixAbstract:Abstract Pollution from pesticide residues in aquatic environments is of increasing concern. Imazalil and Tebuconazole, two commonly used systemic pesticides, are water contaminants that can be removed by constructed wetlands. However, the phytoremediation capability of emergent wetland plants for imazalil and Tebuconazole, especially the removal mechanisms involved, is poorly understood. This study compared the removal of both pesticides by four commonly used wetland plants, Typha latifolia , Phragmites australis , Iris pseudacorus and Juncus effusus , and aimed to understand the removal mechanisms involved. The plants were individually exposed to an initial concentration of 10 mg/L in hydroponic solution. At the end of the 24-day study period, the Tebuconazole removal efficiencies were relatively lower (25%–41%) than those for imazalil (46%–96%) for all plant species studied. The removal of imazalil and Tebuconazole fit a first-order kinetics model, with the exception of Tebuconazole removal in solutions with I. pseudacorus . Changes in the enantiomeric fraction for imazalil and Tebuconazole were detected in plant tissue but not in the hydroponic solutions; thus, the translocation and degradation processes were enantioselective in the plants. At the end of the study period, the accumulation of imazalil and Tebuconazole in plant tissue was relatively low and constituted 2.8–14.4% of the total spiked pesticide in each vessel. Therefore, the studied plants were able to not only take up the pesticides but also metabolise them.
Stefani Altenhofen - One of the best experts on this subject based on the ideXlab platform.
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Tebuconazole alters morphological behavioral and neurochemical parameters in larvae and adult zebrafish danio rerio
Chemosphere, 2017Co-Authors: Stefani Altenhofen, Debora Dreher Nabinger, Melissa Talita Wiprich, Talita Carneiro Brandao Pereira, Mauricio Reis Bogo, Carla Denise BonanAbstract:In this study, we evaluated the effects of Tebuconazole on morphology and exploratory larvae behavior and adult locomotion. Furthermore, we analyzed the effects of this fungicide on AChE activity and gene expression in zebrafish larvae and in the adult zebrafish brain. Tebuconazole (4 mg/L) increased the ocular distance in larvae and reduced the distance travelled, absolute turn angle, line crossing and time outside area in exposed larvae. Moreover, adult zebrafish that were exposed to this fungicide (4 and 6 mg/L) showed a decrease in distance travelled and mean speed when compared to the control group. However, Tebuconazole did not alter the number of line crossings or time spent in the upper zone. Tebuconazole inhibited AChE activity at concentrations of 4 mg/L for larvae and 4 and 6 mg/L in the adult zebrafish brain. However, this fungicide did not alter AChE gene expression in the adult zebrafish brain but increased AChE mRNA transcript levels in larvae. These findings demonstrated that Tebuconazole could modulate the cholinergic system by altering AChE activity and that this change may be associated with the reduced locomotion of these animals.
