The ability of Elsholtzia splendens Naki(E. splendens) to accumulate copper appears to be governed by its high degree of copper tolerance. However, the tolerance mechanism on the physiological basis is unknown. Using ...The ability of Elsholtzia splendens Naki(E. splendens) to accumulate copper appears to be governed by its high degree of copper tolerance. However, the tolerance mechanism on the physiological basis is unknown. Using transmission electron microscope(TEM) and energy dispersive analysis of X-rays(EDX), the likely location of copper within the cells of the tolerant and non-tolerant was determined. Here the role of vacuolar and cell wall compartmentalization in this copper tolerant plant were investigated. A direct comparison of copper locations of E. splendens and the non-tolerant Astragalus sinicus L.(A. sinicus) showed that the majority of copper in the tolerant was localized primarily in the vacuolar, cell wall, on the plasmamembrane, beside lipid grains induced by copper pollution, in the chloroplasts and amyloids; but in the non-tolerant, copper precipitates only be observed on the plasmamembrane, in the chloroplasts and cytoplasm under copper exposure conditions that were toxic to both species. This revealed that the tolerant accumulates more copper in the vacuole and cell wall than the non-tolerant, where was regarded as the storage compartment of tolerant plant or hyperaccumulator for heavy metals.展开更多
Acrylonitrile reacts with aryl iodides in the presence of tri-n-butylamine and a catalytic amount of a silica-bound arsine palladium(0) complex to afford stereoselectively (E)-cinnamo- nitriles in high yields.
Using- the recursion method, we study the phase transitions of theAshkin-Teller model on the Bethe lattice, restricting ourselves to the case of ferromagneticinteractions. The isotropic Ashkin-Teller model and the ani...Using- the recursion method, we study the phase transitions of theAshkin-Teller model on the Bethe lattice, restricting ourselves to the case of ferromagneticinteractions. The isotropic Ashkin-Teller model and the anisotropic one are respectivelyinvestigated, and exact expressions for the free energy and the magnetization are obtained. It canbe found that each of the three varieties of phase diagrams, for the anisotropic Ashkin-Tellermodel, consists of four phases, i.e., the fully disordered paramagnetic phase Para, the fullyordered ferromagnetic phase Ferro, and two partially ordered ferromagnetic phases 【 σ 】 and 【 σs】, while the phase diagram, for the isotropic Ashkin-Teller model, contains three phases, i.e., thefully disordered paramagnetic phase Para, the fully ordered ferromagnetic phase Baxter Phase, andthe partially ordered ferromagnetic phase 【 σs 】.展开更多
Alkynylstannanes 1 react with Cp2Zr(H)Cl (Cp=?-C5H5) giving (Z)--stannylvinyl- zirconium complexes 2, which are trapped with NBS or iodine in THF at 0C to stereoselectively afford (Z)-a-bromovinylstannanes and (E)- a-...Alkynylstannanes 1 react with Cp2Zr(H)Cl (Cp=?-C5H5) giving (Z)--stannylvinyl- zirconium complexes 2, which are trapped with NBS or iodine in THF at 0C to stereoselectively afford (Z)-a-bromovinylstannanes and (E)- a-iodovinylstannanes 3, respectively.展开更多
Stable s-butyl n-heptafluorobutyryl nitroxide 3 has been generated in an electron transfer reaction in F113 ( CFCl2CF2Cl ) solution at r.t. The aN values for 3 in 11 aprotic solvents show a linear correlation with cy...Stable s-butyl n-heptafluorobutyryl nitroxide 3 has been generated in an electron transfer reaction in F113 ( CFCl2CF2Cl ) solution at r.t. The aN values for 3 in 11 aprotic solvents show a linear correlation with cybotactic solvent parameters ET and Z. The physical significance for slopes, slope×ET or slope×Z, and the extrapolated intercepts on the aN axis are well established. The plots of aN versus noncybotactic solvent parameters, such as dipolar moment and dielectric constant, are badly behaved.展开更多
Polystyrene-supported 4-(phenylseleno)morpholine was synthesized and could be used as an efficient ?selenenylating agent for saturated aldehydes. ?Haloaldehydes were prepared by reaction of polystyrene-supported ?sel...Polystyrene-supported 4-(phenylseleno)morpholine was synthesized and could be used as an efficient ?selenenylating agent for saturated aldehydes. ?Haloaldehydes were prepared by reaction of polystyrene-supported ?selenoaldehydes with bromine or sulfuryl chloride in good yield and high purity.展开更多
Reaction of polymer-supported a-selenoaldehydes with Grignard reagents afforded polymer-bound B-hydroxyalkyl selenides, which treated with thionyl chloride and triethylamine leading to (E)-1, 2-disubstituted ethenes i...Reaction of polymer-supported a-selenoaldehydes with Grignard reagents afforded polymer-bound B-hydroxyalkyl selenides, which treated with thionyl chloride and triethylamine leading to (E)-1, 2-disubstituted ethenes in good yield.展开更多
Using the path integral method we derive quantum wave function and quantum fluctuations of charge andcurrent in the mesoscopic RLC circuit. We find that the quantum fluctuation of charge decreases with time, oppositel...Using the path integral method we derive quantum wave function and quantum fluctuations of charge andcurrent in the mesoscopic RLC circuit. We find that the quantum fluctuation of charge decreases with time, oppositely,the quantum fluctuation of current increases with time monotonously. Therefore there is a squeezing effect in the circuit.If some more charge devices are used in the mesoscopic-damped circuit, the quantum noise can be reduced. We also findthat uncertainty relation of charge and current periodically varies with the period π/2 in the under-damped case.展开更多
Z)-á-Bromovinylstannanes undergo the cross-coupling reaction with alkynyl iodides in the presence of Pd(PPh3)4 and CuI in THF at room temperature to afford stereoselectively (E)-1, 3- enynyl bromides in good yields.
Under the Born-von-Karmann periodic boundary condition, we propose a quantization scheme for non-dissipative distributed parameter circuits (i.e. a uniform periodic transmission line). We find the unitary operator for...Under the Born-von-Karmann periodic boundary condition, we propose a quantization scheme for non-dissipative distributed parameter circuits (i.e. a uniform periodic transmission line). We find the unitary operator for diagonalizing the Hamiltonian of the uniform periodic transmission line. The unitary operator is expressed in a coordinate representation that brings convenience to deriving the density matrix rho(q,q',beta). The quantum fluctuations of charge and current at a definite temperature have been studied. It is shown that quantum fluctuations of distributed parameter circuits, which also have distributed properties, are related to both the circuit parameters and the positions and the mode of signals and temperature T. The higher the temperature is, the stronger quantum noise the circuit exhibits.展开更多
A great deal of stabilized retained austenite can be obtained by means of austempering immediately after intercritical annealing in the low-carbon plain steel sheets which only contain alloying elements of silicon and...A great deal of stabilized retained austenite can be obtained by means of austempering immediately after intercritical annealing in the low-carbon plain steel sheets which only contain alloying elements of silicon and manganese. Transformation from retained austenite to martensite may be induced by strain at a temperature ranging from 50 ℃ to 400 ℃ during tension testing. Transformation-induced plasticity (TRIP) may occur. Alloying of silicon improves the stability of retained austenite. Mechanical properties of the present TRIP steels containing manganese increase with increasing silicon amount when the amount of silicon is less than two percent.展开更多
基金The National Natural Science Foundation of China(No. 40271060)
文摘The ability of Elsholtzia splendens Naki(E. splendens) to accumulate copper appears to be governed by its high degree of copper tolerance. However, the tolerance mechanism on the physiological basis is unknown. Using transmission electron microscope(TEM) and energy dispersive analysis of X-rays(EDX), the likely location of copper within the cells of the tolerant and non-tolerant was determined. Here the role of vacuolar and cell wall compartmentalization in this copper tolerant plant were investigated. A direct comparison of copper locations of E. splendens and the non-tolerant Astragalus sinicus L.(A. sinicus) showed that the majority of copper in the tolerant was localized primarily in the vacuolar, cell wall, on the plasmamembrane, beside lipid grains induced by copper pollution, in the chloroplasts and amyloids; but in the non-tolerant, copper precipitates only be observed on the plasmamembrane, in the chloroplasts and cytoplasm under copper exposure conditions that were toxic to both species. This revealed that the tolerant accumulates more copper in the vacuole and cell wall than the non-tolerant, where was regarded as the storage compartment of tolerant plant or hyperaccumulator for heavy metals.
文摘Acrylonitrile reacts with aryl iodides in the presence of tri-n-butylamine and a catalytic amount of a silica-bound arsine palladium(0) complex to afford stereoselectively (E)-cinnamo- nitriles in high yields.
文摘Using- the recursion method, we study the phase transitions of theAshkin-Teller model on the Bethe lattice, restricting ourselves to the case of ferromagneticinteractions. The isotropic Ashkin-Teller model and the anisotropic one are respectivelyinvestigated, and exact expressions for the free energy and the magnetization are obtained. It canbe found that each of the three varieties of phase diagrams, for the anisotropic Ashkin-Tellermodel, consists of four phases, i.e., the fully disordered paramagnetic phase Para, the fullyordered ferromagnetic phase Ferro, and two partially ordered ferromagnetic phases 【 σ 】 and 【 σs】, while the phase diagram, for the isotropic Ashkin-Teller model, contains three phases, i.e., thefully disordered paramagnetic phase Para, the fully ordered ferromagnetic phase Baxter Phase, andthe partially ordered ferromagnetic phase 【 σs 】.
文摘Alkynylstannanes 1 react with Cp2Zr(H)Cl (Cp=?-C5H5) giving (Z)--stannylvinyl- zirconium complexes 2, which are trapped with NBS or iodine in THF at 0C to stereoselectively afford (Z)-a-bromovinylstannanes and (E)- a-iodovinylstannanes 3, respectively.
文摘Stable s-butyl n-heptafluorobutyryl nitroxide 3 has been generated in an electron transfer reaction in F113 ( CFCl2CF2Cl ) solution at r.t. The aN values for 3 in 11 aprotic solvents show a linear correlation with cybotactic solvent parameters ET and Z. The physical significance for slopes, slope×ET or slope×Z, and the extrapolated intercepts on the aN axis are well established. The plots of aN versus noncybotactic solvent parameters, such as dipolar moment and dielectric constant, are badly behaved.
文摘Polystyrene-supported 4-(phenylseleno)morpholine was synthesized and could be used as an efficient ?selenenylating agent for saturated aldehydes. ?Haloaldehydes were prepared by reaction of polystyrene-supported ?selenoaldehydes with bromine or sulfuryl chloride in good yield and high purity.
基金Project 29932020 was supported by the National Natural Science Foundation of China.
文摘Reaction of polymer-supported a-selenoaldehydes with Grignard reagents afforded polymer-bound B-hydroxyalkyl selenides, which treated with thionyl chloride and triethylamine leading to (E)-1, 2-disubstituted ethenes in good yield.
文摘Using the path integral method we derive quantum wave function and quantum fluctuations of charge andcurrent in the mesoscopic RLC circuit. We find that the quantum fluctuation of charge decreases with time, oppositely,the quantum fluctuation of current increases with time monotonously. Therefore there is a squeezing effect in the circuit.If some more charge devices are used in the mesoscopic-damped circuit, the quantum noise can be reduced. We also findthat uncertainty relation of charge and current periodically varies with the period π/2 in the under-damped case.
文摘Z)-á-Bromovinylstannanes undergo the cross-coupling reaction with alkynyl iodides in the presence of Pd(PPh3)4 and CuI in THF at room temperature to afford stereoselectively (E)-1, 3- enynyl bromides in good yields.
文摘Under the Born-von-Karmann periodic boundary condition, we propose a quantization scheme for non-dissipative distributed parameter circuits (i.e. a uniform periodic transmission line). We find the unitary operator for diagonalizing the Hamiltonian of the uniform periodic transmission line. The unitary operator is expressed in a coordinate representation that brings convenience to deriving the density matrix rho(q,q',beta). The quantum fluctuations of charge and current at a definite temperature have been studied. It is shown that quantum fluctuations of distributed parameter circuits, which also have distributed properties, are related to both the circuit parameters and the positions and the mode of signals and temperature T. The higher the temperature is, the stronger quantum noise the circuit exhibits.
文摘A great deal of stabilized retained austenite can be obtained by means of austempering immediately after intercritical annealing in the low-carbon plain steel sheets which only contain alloying elements of silicon and manganese. Transformation from retained austenite to martensite may be induced by strain at a temperature ranging from 50 ℃ to 400 ℃ during tension testing. Transformation-induced plasticity (TRIP) may occur. Alloying of silicon improves the stability of retained austenite. Mechanical properties of the present TRIP steels containing manganese increase with increasing silicon amount when the amount of silicon is less than two percent.
