The Experts below are selected from a list of 1818 Experts worldwide ranked by ideXlab platform
I. J. Misaghi - One of the best experts on this subject based on the ideXlab platform.
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Interactions Between Herbicides and Cotton Seedling Damping-off in the Field
2016Co-Authors: A. Misaghi, A. Heydari, I. J. MisaghiAbstract:We studied the impact of three pre plant herbicides, trifluralin, pendimethalin and Prometryn on the incidence and the development of Rhizoctonia solani- induced cotton seedling damping-off in the field. In a field experiment conducted in Safford, Arizona, pre plant application of pendimethalin or Prometryn but not trifluralin caused significant (P <0.05) increases in disease incidence. In another field experiment in Tucson, Arizona, significant (P <0.05) increase in disease incidence was observed in plots treated with Prometryn and not in those treated with pendimethalin and trijuralin. In Tucson field experiment, application of herbicides also affected disease development as judged by the slope of disease progress curves
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The role of rhizosphere bacteria in herbicide-mediated increase in Rhizoctonia solani-induced cotton seedling damping-off
Plant and Soil, 2003Co-Authors: Asghar Heydari, I. J. MisaghiAbstract:A study was carried out to determine the role of rhizosphere-residing bacteria in the observed pendimethalin- and Prometryn-mediated increase in cotton seedling damping-off incidence caused by Rhizoctonia solani. Judging from the results, pendimethalin-mediated increase in disease incidence may be due to a decrease in the populations of indigenous cotton root colonizing bacteria in the presence of pendimethalin. Prometryn-mediated increase in disease may be due to a decrease in the populations of indigenous root colonizing bacteria as well as increased susceptibility of cotton seedlings to R. solani infection in the presence of Prometryn. Pendimethalin and Prometryn neither affected the growth of R. solani nor caused any visible change in seedling physical characteristics.
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Interactions Between Herbicides and Cotton Seedling Damping-off in the field
1998Co-Authors: A. Heydari, I. J. MisaghiAbstract:We studied the impact of three pre plant herbicides, trifluralin, pendimethalin and Prometryn on the incidence and the development of Rhizoctonia solaniinduced cotton seedling damping -off in the field. In a field experiment conducted in Safford, Arizona, pre plant application of pendimethalin or Prometryn but not trifluralin caused significant (P
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The impact of herbicides on the incidence and development of Rhizoctonia solani-induced cotton seedling damping-off
Plant disease, 1998Co-Authors: Asghar Heydari, I. J. MisaghiAbstract:ABSTRACT The impact of three pre-plant herbicides, trifluralin, pendimethalin and Prometryn, on the incidence and the development of Rhizoctonia solani-induced cotton seedling damping-off was investigated in the controlled environmental chamber and in the field. In the controlled environmental chamber experiments, trifluralin, pendimethalin and Prometryn were applied to the soil at 1.8, 2.4, and 3.6 μg a.i. g-1 soil, respectively (equivalent to the respective recommended field concentrations of 0.7, 0.9, and 1.3 kg a.i. ha-1). In the controlled environmental chamber experiments, where soil was infested at planting, application of Prometryn, but not pendimethalin or trifluralin, to the soil caused a significant (P < 0.05) increase in damping-off incidence. In controlled environmental chamber experiments where soil was infested after emergence, damping-off increased significantly (P < 0.05) in the presence of pendimethalin and Prometryn, but not trifluralin. In a field experiment conducted in Safford, Arizo...
Haiqun Cao - One of the best experts on this subject based on the ideXlab platform.
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Enhanced degradation of Prometryn and other s-triazine herbicides in pure cultures and wastewater by polyvinyl alcohol-sodium alginate immobilized Leucobacter sp. JW-1.
The Science of the total environment, 2017Co-Authors: Junwei Liu, Dandan Pan, Haiyan Chen, Haiqun Cao, Rimao HuaAbstract:The s-triazine herbicides, such as Prometryn, have been widely used in agriculture and have raised much public concern over their contamination of water and soil. Leucobacter sp. JW-1 cells were immobilized in polyvinyl alcohol‑sodium alginate (PVA-SA) beads and then used to degrade Prometryn. Orthogonal array experiments showed that the optimal immobilization conditions of PVA-SA immobilized Leucobacter sp. JW-1 beads (PSLBs) were 3% JW-1 cells (w/v, wet weight), 10-12% (w/v) PVA, 2-3% (w/v) calcium chloride, and an immobilization time of 24-36h. The PSLBs were more tolerance to pH, temperature and salinity changes than free JW-1 cells and were stable and effective for degrading Prometryn through six reuse cycles without losing their degradation capacity. The half-life of Prometryn degradation by PSLBs at 100mgL-1 in pesticide plant wastewaters were 1.1-6.9h. The rate constants of Prometryn degradation by PSLBs in wastewaters ranged from 304 to 576mgL-1day-1, which were approximately 1.25-118 times those of degradation by free JW-1 cells. The PSLBs degraded 99.9% of atrazine, 99.9% of ametryn, 97.8% of propazine, 100.0% of simetryn, 77.9% of simazine, 98.9% of terbuthylazine, 95.2% of prometon, 98.9% of atraton, and 31.6% of terbumeton at an initial concentration of 50mgL-1 of each herbicide in 2days. This study indicates that PSLBs persistently biodegrade s-triazine herbicides better than JW-1 free cells, and can be an efficient, safe and reusable biomaterial for the removal of s-triazine herbicides from contaminated sites.
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Novel hydrolytic de-methylthiolation of the s-triazine herbicide Prometryn by Leucobacter sp. JW-1.
The Science of the total environment, 2016Co-Authors: Junwei Liu, Rimao Hua, Jun Tang, Yi Wang, Haiqun CaoAbstract:Abstract s -Triazine herbicides have been widely used in recent decades and caused serious concern over contamination of groundwater, surface water and soil. A novel bacterial strain JW-1 was isolated from activated sludge and identified as Leucobacter sp. based on comparative morphology, physiological characteristics and comparison of the 16S rDNA gene sequence. JW-1 was capable of using methylthio- s -triazine Prometryn as a sole source of carbon and energy in pure culture. Favorable conditions for Prometryn degradation were found at pH 7.0–9.0 and temperature of 37–42 °C. The degradation half-life of Prometryn at 50 mg L − 1 was remarkably as short as 1.1 h, and increased to 6.0 h when the initial concentration increased to 400 mg L − 1 . The strain JW-1 could degrade 100% of ametryn, 99% of simetryn, 41% of propazine, 43% of atrazine, 28% of simazine, 12% of terbutylhylazine, 10% of prometon and 13% of atraton at 50 mg L − 1 of each herbicide in 2 days. Prometryn was converted to 2-hydroxypropazine and methanthiol via a novel hydrolysis pathway. 2-Hydroxypropazine was then transformed to N -isopropylammelide and the final product cyanuric acid via two sequential deamination reactions. In addition to biodegradation by Leucobacter sp. JW-1, the hydrolytic de-methylthiolation would be valuable in biocatalysis.
Rimao Hua - One of the best experts on this subject based on the ideXlab platform.
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Enhanced degradation of Prometryn and other s-triazine herbicides in pure cultures and wastewater by polyvinyl alcohol-sodium alginate immobilized Leucobacter sp. JW-1.
The Science of the total environment, 2017Co-Authors: Junwei Liu, Dandan Pan, Haiyan Chen, Haiqun Cao, Rimao HuaAbstract:The s-triazine herbicides, such as Prometryn, have been widely used in agriculture and have raised much public concern over their contamination of water and soil. Leucobacter sp. JW-1 cells were immobilized in polyvinyl alcohol‑sodium alginate (PVA-SA) beads and then used to degrade Prometryn. Orthogonal array experiments showed that the optimal immobilization conditions of PVA-SA immobilized Leucobacter sp. JW-1 beads (PSLBs) were 3% JW-1 cells (w/v, wet weight), 10-12% (w/v) PVA, 2-3% (w/v) calcium chloride, and an immobilization time of 24-36h. The PSLBs were more tolerance to pH, temperature and salinity changes than free JW-1 cells and were stable and effective for degrading Prometryn through six reuse cycles without losing their degradation capacity. The half-life of Prometryn degradation by PSLBs at 100mgL-1 in pesticide plant wastewaters were 1.1-6.9h. The rate constants of Prometryn degradation by PSLBs in wastewaters ranged from 304 to 576mgL-1day-1, which were approximately 1.25-118 times those of degradation by free JW-1 cells. The PSLBs degraded 99.9% of atrazine, 99.9% of ametryn, 97.8% of propazine, 100.0% of simetryn, 77.9% of simazine, 98.9% of terbuthylazine, 95.2% of prometon, 98.9% of atraton, and 31.6% of terbumeton at an initial concentration of 50mgL-1 of each herbicide in 2days. This study indicates that PSLBs persistently biodegrade s-triazine herbicides better than JW-1 free cells, and can be an efficient, safe and reusable biomaterial for the removal of s-triazine herbicides from contaminated sites.
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Novel hydrolytic de-methylthiolation of the s-triazine herbicide Prometryn by Leucobacter sp. JW-1.
The Science of the total environment, 2016Co-Authors: Junwei Liu, Rimao Hua, Jun Tang, Yi Wang, Haiqun CaoAbstract:Abstract s -Triazine herbicides have been widely used in recent decades and caused serious concern over contamination of groundwater, surface water and soil. A novel bacterial strain JW-1 was isolated from activated sludge and identified as Leucobacter sp. based on comparative morphology, physiological characteristics and comparison of the 16S rDNA gene sequence. JW-1 was capable of using methylthio- s -triazine Prometryn as a sole source of carbon and energy in pure culture. Favorable conditions for Prometryn degradation were found at pH 7.0–9.0 and temperature of 37–42 °C. The degradation half-life of Prometryn at 50 mg L − 1 was remarkably as short as 1.1 h, and increased to 6.0 h when the initial concentration increased to 400 mg L − 1 . The strain JW-1 could degrade 100% of ametryn, 99% of simetryn, 41% of propazine, 43% of atrazine, 28% of simazine, 12% of terbutylhylazine, 10% of prometon and 13% of atraton at 50 mg L − 1 of each herbicide in 2 days. Prometryn was converted to 2-hydroxypropazine and methanthiol via a novel hydrolysis pathway. 2-Hydroxypropazine was then transformed to N -isopropylammelide and the final product cyanuric acid via two sequential deamination reactions. In addition to biodegradation by Leucobacter sp. JW-1, the hydrolytic de-methylthiolation would be valuable in biocatalysis.
Junwei Liu - One of the best experts on this subject based on the ideXlab platform.
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Enhanced degradation of Prometryn and other s-triazine herbicides in pure cultures and wastewater by polyvinyl alcohol-sodium alginate immobilized Leucobacter sp. JW-1.
The Science of the total environment, 2017Co-Authors: Junwei Liu, Dandan Pan, Haiyan Chen, Haiqun Cao, Rimao HuaAbstract:The s-triazine herbicides, such as Prometryn, have been widely used in agriculture and have raised much public concern over their contamination of water and soil. Leucobacter sp. JW-1 cells were immobilized in polyvinyl alcohol‑sodium alginate (PVA-SA) beads and then used to degrade Prometryn. Orthogonal array experiments showed that the optimal immobilization conditions of PVA-SA immobilized Leucobacter sp. JW-1 beads (PSLBs) were 3% JW-1 cells (w/v, wet weight), 10-12% (w/v) PVA, 2-3% (w/v) calcium chloride, and an immobilization time of 24-36h. The PSLBs were more tolerance to pH, temperature and salinity changes than free JW-1 cells and were stable and effective for degrading Prometryn through six reuse cycles without losing their degradation capacity. The half-life of Prometryn degradation by PSLBs at 100mgL-1 in pesticide plant wastewaters were 1.1-6.9h. The rate constants of Prometryn degradation by PSLBs in wastewaters ranged from 304 to 576mgL-1day-1, which were approximately 1.25-118 times those of degradation by free JW-1 cells. The PSLBs degraded 99.9% of atrazine, 99.9% of ametryn, 97.8% of propazine, 100.0% of simetryn, 77.9% of simazine, 98.9% of terbuthylazine, 95.2% of prometon, 98.9% of atraton, and 31.6% of terbumeton at an initial concentration of 50mgL-1 of each herbicide in 2days. This study indicates that PSLBs persistently biodegrade s-triazine herbicides better than JW-1 free cells, and can be an efficient, safe and reusable biomaterial for the removal of s-triazine herbicides from contaminated sites.
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Novel hydrolytic de-methylthiolation of the s-triazine herbicide Prometryn by Leucobacter sp. JW-1.
The Science of the total environment, 2016Co-Authors: Junwei Liu, Rimao Hua, Jun Tang, Yi Wang, Haiqun CaoAbstract:Abstract s -Triazine herbicides have been widely used in recent decades and caused serious concern over contamination of groundwater, surface water and soil. A novel bacterial strain JW-1 was isolated from activated sludge and identified as Leucobacter sp. based on comparative morphology, physiological characteristics and comparison of the 16S rDNA gene sequence. JW-1 was capable of using methylthio- s -triazine Prometryn as a sole source of carbon and energy in pure culture. Favorable conditions for Prometryn degradation were found at pH 7.0–9.0 and temperature of 37–42 °C. The degradation half-life of Prometryn at 50 mg L − 1 was remarkably as short as 1.1 h, and increased to 6.0 h when the initial concentration increased to 400 mg L − 1 . The strain JW-1 could degrade 100% of ametryn, 99% of simetryn, 41% of propazine, 43% of atrazine, 28% of simazine, 12% of terbutylhylazine, 10% of prometon and 13% of atraton at 50 mg L − 1 of each herbicide in 2 days. Prometryn was converted to 2-hydroxypropazine and methanthiol via a novel hydrolysis pathway. 2-Hydroxypropazine was then transformed to N -isopropylammelide and the final product cyanuric acid via two sequential deamination reactions. In addition to biodegradation by Leucobacter sp. JW-1, the hydrolytic de-methylthiolation would be valuable in biocatalysis.
Asghar Heydari - One of the best experts on this subject based on the ideXlab platform.
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The role of rhizosphere bacteria in herbicide-mediated increase in Rhizoctonia solani-induced cotton seedling damping-off
Plant and Soil, 2003Co-Authors: Asghar Heydari, I. J. MisaghiAbstract:A study was carried out to determine the role of rhizosphere-residing bacteria in the observed pendimethalin- and Prometryn-mediated increase in cotton seedling damping-off incidence caused by Rhizoctonia solani. Judging from the results, pendimethalin-mediated increase in disease incidence may be due to a decrease in the populations of indigenous cotton root colonizing bacteria in the presence of pendimethalin. Prometryn-mediated increase in disease may be due to a decrease in the populations of indigenous root colonizing bacteria as well as increased susceptibility of cotton seedlings to R. solani infection in the presence of Prometryn. Pendimethalin and Prometryn neither affected the growth of R. solani nor caused any visible change in seedling physical characteristics.
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The impact of herbicides on the incidence and development of Rhizoctonia solani-induced cotton seedling damping-off
Plant disease, 1998Co-Authors: Asghar Heydari, I. J. MisaghiAbstract:ABSTRACT The impact of three pre-plant herbicides, trifluralin, pendimethalin and Prometryn, on the incidence and the development of Rhizoctonia solani-induced cotton seedling damping-off was investigated in the controlled environmental chamber and in the field. In the controlled environmental chamber experiments, trifluralin, pendimethalin and Prometryn were applied to the soil at 1.8, 2.4, and 3.6 μg a.i. g-1 soil, respectively (equivalent to the respective recommended field concentrations of 0.7, 0.9, and 1.3 kg a.i. ha-1). In the controlled environmental chamber experiments, where soil was infested at planting, application of Prometryn, but not pendimethalin or trifluralin, to the soil caused a significant (P < 0.05) increase in damping-off incidence. In controlled environmental chamber experiments where soil was infested after emergence, damping-off increased significantly (P < 0.05) in the presence of pendimethalin and Prometryn, but not trifluralin. In a field experiment conducted in Safford, Arizo...
