Objective\ To validate the use of Allium sativum as a reliable test model for genotoxicity, isoproturon, a substituted phenylalkylurea herbicide, was evaluated on the root meristem cells by this plant system. M...Objective\ To validate the use of Allium sativum as a reliable test model for genotoxicity, isoproturon, a substituted phenylalkylurea herbicide, was evaluated on the root meristem cells by this plant system. Method\ Test concentrations were selected by determining EC50 and root tips were exposed to various concentrations for 6 or 24 hr. EC50 concentration was calculated to be 70.8 ppm for the root growth. In addition to root growth retardation exposure to isoproturon induced morpholoogical changes like discolouration and stiffness of roots. Results\ Exposure to various experimental concentrations of isoproturon (35-280 ppm), including EC50, significantly and dose-dependently inhibited the mitotic index and induced chromosome breaks/mitotic aberrations at 6 or 24 hr. Conclusion\ The frequency of aberrations was found to be decreased in a dose dependant manner at 24 or 48 hr post exposure, however in comparison of control cells the frequency of aberrations was considerably high which indicates genotoxicity potentials of isoproturon. Further, present study also suggests that Allium sativum is a sensitive, efficient, and reliable test system for measuring the genotoxicity potential of environmental chemicals.展开更多
A new complex,Co（0.5）Ni（0.5）（C2H6N2O）6SO4（Ⅰ）, was synthesized and its single crystal was obtained from aqueous solution by evaporating solvent slowly. Single-crystal X-ray analysis revealed that the complex b...A new complex,Co（0.5）Ni（0.5）（C2H6N2O）6SO4（Ⅰ）, was synthesized and its single crystal was obtained from aqueous solution by evaporating solvent slowly. Single-crystal X-ray analysis revealed that the complex belongs to trigonal system, space group R-3c, with a = b = 10.999（2） A, c = 40.439（13） A, V = 4237（2）A3, Z = 6, Dc = 1.410 g/cm3, Mr = 599.41, μ = 0.785 mm-1, F（000） = 1893, the final R = 0.0330 and wR = 0.0926（I 〉 2σ（I））. IR spectrum and compositional analyses（elemental analyzer and ICP） were used to characterize the composition of the product. TGA（Thermal Gravimetric Analysis） showed that complex Ⅰ remained stable until it is heated up to 200 ℃, indicating its good thermostability. The main transmission peak of complex Ⅰ in UV-Vis spectrum appeared at 290 nm, making it an eligible material for ultraviolet light filters（ULF）.展开更多
Aqueous Zn batteries(AZBs)suffer from poor Zn anode reversibility.To address this issue,excess Zn foil is often utilized to prolong the cycle life,but it reduces the actual battery energy density.In this work,we use m...Aqueous Zn batteries(AZBs)suffer from poor Zn anode reversibility.To address this issue,excess Zn foil is often utilized to prolong the cycle life,but it reduces the actual battery energy density.In this work,we use methylurea molecules to in situ form a solid electrolyte interphase(SEI)layer on the Zn anode,achieving reversible Zn plating/stripping with a maximal Coulombic efficiency(CE)of 99.99%and extending the anode's lifespan to 4500 cycles.Leveraging this highly reversible chemistry,we fabricate and test various anode-free Zn batteries.An anode-free Zn-AC cell exhibits stable cycling for exceeding 5000 cycles,an anode-free Zn-I_(2) battery with high specific capacities achieves a stable cycle life of 1000 cycles,and an anode-free Zn-Br_(2) battery with a high areal capacity of 4 mAh cm^(-2) demonstrates a stable cycle life of 450 cycles.Characterization of the SEI using TEM and DFT calculations reveal the formation mechanisms of the ZnCO_(3)-and ZnS-rich amorphous SEI layer.These results indicate that the design of desirable SEI compositions could pave the way for developing low-cost,high-performance anode-free AZBs.展开更多
文摘Objective\ To validate the use of Allium sativum as a reliable test model for genotoxicity, isoproturon, a substituted phenylalkylurea herbicide, was evaluated on the root meristem cells by this plant system. Method\ Test concentrations were selected by determining EC50 and root tips were exposed to various concentrations for 6 or 24 hr. EC50 concentration was calculated to be 70.8 ppm for the root growth. In addition to root growth retardation exposure to isoproturon induced morpholoogical changes like discolouration and stiffness of roots. Results\ Exposure to various experimental concentrations of isoproturon (35-280 ppm), including EC50, significantly and dose-dependently inhibited the mitotic index and induced chromosome breaks/mitotic aberrations at 6 or 24 hr. Conclusion\ The frequency of aberrations was found to be decreased in a dose dependant manner at 24 or 48 hr post exposure, however in comparison of control cells the frequency of aberrations was considerably high which indicates genotoxicity potentials of isoproturon. Further, present study also suggests that Allium sativum is a sensitive, efficient, and reliable test system for measuring the genotoxicity potential of environmental chemicals.
基金Supported by Key Laboratory of Optoelectronic Materials Chemistry and Physics,Chinese Academy of Sciences
文摘A new complex,Co（0.5）Ni（0.5）（C2H6N2O）6SO4（Ⅰ）, was synthesized and its single crystal was obtained from aqueous solution by evaporating solvent slowly. Single-crystal X-ray analysis revealed that the complex belongs to trigonal system, space group R-3c, with a = b = 10.999（2） A, c = 40.439（13） A, V = 4237（2）A3, Z = 6, Dc = 1.410 g/cm3, Mr = 599.41, μ = 0.785 mm-1, F（000） = 1893, the final R = 0.0330 and wR = 0.0926（I 〉 2σ（I））. IR spectrum and compositional analyses（elemental analyzer and ICP） were used to characterize the composition of the product. TGA（Thermal Gravimetric Analysis） showed that complex Ⅰ remained stable until it is heated up to 200 ℃, indicating its good thermostability. The main transmission peak of complex Ⅰ in UV-Vis spectrum appeared at 290 nm, making it an eligible material for ultraviolet light filters（ULF）.
基金support from the National Natural Science Foundation of China(52471242,92372122,21825302,22303094)the Fundamental Research Funds for the Central Universities(WK2060000040,KY2060000150,GG2060127001).
文摘Aqueous Zn batteries(AZBs)suffer from poor Zn anode reversibility.To address this issue,excess Zn foil is often utilized to prolong the cycle life,but it reduces the actual battery energy density.In this work,we use methylurea molecules to in situ form a solid electrolyte interphase(SEI)layer on the Zn anode,achieving reversible Zn plating/stripping with a maximal Coulombic efficiency(CE)of 99.99%and extending the anode's lifespan to 4500 cycles.Leveraging this highly reversible chemistry,we fabricate and test various anode-free Zn batteries.An anode-free Zn-AC cell exhibits stable cycling for exceeding 5000 cycles,an anode-free Zn-I_(2) battery with high specific capacities achieves a stable cycle life of 1000 cycles,and an anode-free Zn-Br_(2) battery with a high areal capacity of 4 mAh cm^(-2) demonstrates a stable cycle life of 450 cycles.Characterization of the SEI using TEM and DFT calculations reveal the formation mechanisms of the ZnCO_(3)-and ZnS-rich amorphous SEI layer.These results indicate that the design of desirable SEI compositions could pave the way for developing low-cost,high-performance anode-free AZBs.
