We perform molecular beam epitaxy growth and scanning tunneling microscopy study of copper diselenide （CuSe2 ） films on SrTiO3 （001）. Using a Se-rich condition, the single-phase pyrite CuSe2 grows in the Stranski-...We perform molecular beam epitaxy growth and scanning tunneling microscopy study of copper diselenide （CuSe2 ） films on SrTiO3 （001）. Using a Se-rich condition, the single-phase pyrite CuSe2 grows in the Stranski-Krastanov （layer-plus-island） mode with a preferential orientation of （111）. Our careful inspection of both the as-grown and post-annealed CuSe2 films at various temperatures invariably shows a Cu-terminated surface, which, depending on the annealing temperature, reconstructs into two distinct structures 2 ×√3 and √x ×√3-R30°. The Cu termi- nation is supported by the depressed density of states near the Fermi level, measured by in-situ low temperature scanning tunneling spectroscopy. Our study helps understand the preparation and surface chemistry of transition metal pyrite dichalcogenides thin films.展开更多
After injury of the central and peripheral nervous systems,functional recovery is impaired by axon regeneration failure.Various approaches for promoting axon growth have been attempted but their low efficacy has preve...After injury of the central and peripheral nervous systems,functional recovery is impaired by axon regeneration failure.Various approaches for promoting axon growth have been attempted but their low efficacy has prevented them from being clinically applicable.展开更多
A second-generation seedling seed orchard including 32 open-pollinated families of Eucalyptus urophylla was built at Gaoyao City, Guangdong Province to examine the genetic performance of the orchard, which were select...A second-generation seedling seed orchard including 32 open-pollinated families of Eucalyptus urophylla was built at Gaoyao City, Guangdong Province to examine the genetic performance of the orchard, which were selected from the superior trees in an improvement seed orchard. Compared to the characteristics of height, DBH, individual volume, stem form, branch and blossom quantities among different families at 22 months. The results indicate that: (1) The most superior families in individual volume and bl...展开更多
The spatial growth of turbulent wind waves is investigated theoretically and experimentally. Introduction of wave induced turbulent Reynolds stress, in particu- lar at the average interface, makes great improvement in...The spatial growth of turbulent wind waves is investigated theoretically and experimentally. Introduction of wave induced turbulent Reynolds stress, in particu- lar at the average interface, makes great improvement in the prediction of wind wave properties.展开更多
Objective To investigate the effect of basic fibroblast growth factor (bFGF) and vascular endothelial growth factor (VEGF) on limb ischemia/reperfusion injury of rats and the mechanism Methods The hind limb ische...Objective To investigate the effect of basic fibroblast growth factor (bFGF) and vascular endothelial growth factor (VEGF) on limb ischemia/reperfusion injury of rats and the mechanism Methods The hind limb ischemia/reperfusion injury of male SD rats was induced by tourniquet for 2 hours and then reperfusing for 12 hours with administration of different agents Animals were divided into control, bFGF 10 and bFGF 50, VEGF 10 and VEGF 50 group by infusing physiological saline, 10 and 50?μg/kg bFGE, 10 and 50?μg/kg VEGF, respectively Blood was collected to determine malonyldialdehyde (MDA), and the ischemic reperfused gastrocnemius muscle and the contralateral control one were harvested together for measurement of tissue viability, water content, myeloperoxidose (MPO) activity, ATP and MDA concentration Results Compared with control group, tissue viability of ischemia/reperfusion limb in bFGF 10 and bFGF 50 group increased by 16 0% ( P <0 05) and 32 8% ( P <0 01), ATP content increased by 14 8% and 35 6% ( P <0 01), and plasma MDA level decreased by 45 2% and 56 2% ( P <0 01) 10?μg/kg bFGF had no significant effect on tissue water content, MPO activity, MDA concentration of ischemia/reperfusion limb, while 50?μg/kg of bFGF lowered these values by 15 7%, 32 5% and 13 6% ( P <0 05) and 14 7% ( P <0 01), MPO activity augmented by 44 9% and 96 1% ( P <0 01), ATP content decreased by 13 1% ( P <0 05) and 33 3% ( P <0 01) Plasma and tissue MDA concentrations in VEGF 10 group had no significant changes ( P >0 05), while in VEGF 50 group, these values were elevated by 46 4% and 38 6% ( P <0 01) Conclusion bFGF attenuated, while VEGF exacerbated ischemia/reperfusion injury of rat limb significantly, the mechanism of which was probably related to preventing or enhancing lipid peroxide, and increasing or decreasing energy store展开更多
We have experimentally studied the growth process of a water-absorbing polymer commonly known as hydro-gel. We took a number of spherical beads, immersed them in pure water, measured their diameters at regular interva...We have experimentally studied the growth process of a water-absorbing polymer commonly known as hydro-gel. We took a number of spherical beads, immersed them in pure water, measured their diameters at regular intervals of time and plotted graphs showing the change in volume with the time of immersion, to analyze their swelling properties. We have formulated a dynamical model on the basis of curve-fitting to our experimental data. Our mathematical modelling is devoted solely towards the explanation of the swelling of spherical hydro-gels and we have interpreted our observations on these basis. And finally evaluating the constants of the process, we have shown that the results obtained from our modelling and numerical simulation exactly match the experimental data. The justification of this new approach lies in its successful application for the complete explanation of our observations through numerical and analytical ways.展开更多
A stereocontrolled construction of the side chain of brassinosteroid was developed via the separated dialkylation and the tandem dialkylation of the pyranone moiety as the key step.
Lanthanum malonate crystals were grown by single tube ionic diffusion through silica gel. The crystallinity of the grown crystals was analyzed by powder X-ray diffraction studies. Fourier transform infrared spectrosco...Lanthanum malonate crystals were grown by single tube ionic diffusion through silica gel. The crystallinity of the grown crystals was analyzed by powder X-ray diffraction studies. Fourier transform infrared spectroscopy （FTIR） and fourier transform （FT） Raman studies confirmed the presence of functional groups in the title compound. The optical band gap energy of the material was extracted from diffuse reflectance spectrum.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 11374336 and 61176078
文摘We perform molecular beam epitaxy growth and scanning tunneling microscopy study of copper diselenide （CuSe2 ） films on SrTiO3 （001）. Using a Se-rich condition, the single-phase pyrite CuSe2 grows in the Stranski-Krastanov （layer-plus-island） mode with a preferential orientation of （111）. Our careful inspection of both the as-grown and post-annealed CuSe2 films at various temperatures invariably shows a Cu-terminated surface, which, depending on the annealing temperature, reconstructs into two distinct structures 2 ×√3 and √x ×√3-R30°. The Cu termi- nation is supported by the depressed density of states near the Fermi level, measured by in-situ low temperature scanning tunneling spectroscopy. Our study helps understand the preparation and surface chemistry of transition metal pyrite dichalcogenides thin films.
文摘After injury of the central and peripheral nervous systems,functional recovery is impaired by axon regeneration failure.Various approaches for promoting axon growth have been attempted but their low efficacy has prevented them from being clinically applicable.
基金This work was supported by the project of Forest Science and Technology Center of Sino-Forest Corporation
文摘A second-generation seedling seed orchard including 32 open-pollinated families of Eucalyptus urophylla was built at Gaoyao City, Guangdong Province to examine the genetic performance of the orchard, which were selected from the superior trees in an improvement seed orchard. Compared to the characteristics of height, DBH, individual volume, stem form, branch and blossom quantities among different families at 22 months. The results indicate that: (1) The most superior families in individual volume and bl...
文摘The spatial growth of turbulent wind waves is investigated theoretically and experimentally. Introduction of wave induced turbulent Reynolds stress, in particu- lar at the average interface, makes great improvement in the prediction of wind wave properties.
文摘Objective To investigate the effect of basic fibroblast growth factor (bFGF) and vascular endothelial growth factor (VEGF) on limb ischemia/reperfusion injury of rats and the mechanism Methods The hind limb ischemia/reperfusion injury of male SD rats was induced by tourniquet for 2 hours and then reperfusing for 12 hours with administration of different agents Animals were divided into control, bFGF 10 and bFGF 50, VEGF 10 and VEGF 50 group by infusing physiological saline, 10 and 50?μg/kg bFGE, 10 and 50?μg/kg VEGF, respectively Blood was collected to determine malonyldialdehyde (MDA), and the ischemic reperfused gastrocnemius muscle and the contralateral control one were harvested together for measurement of tissue viability, water content, myeloperoxidose (MPO) activity, ATP and MDA concentration Results Compared with control group, tissue viability of ischemia/reperfusion limb in bFGF 10 and bFGF 50 group increased by 16 0% ( P <0 05) and 32 8% ( P <0 01), ATP content increased by 14 8% and 35 6% ( P <0 01), and plasma MDA level decreased by 45 2% and 56 2% ( P <0 01) 10?μg/kg bFGF had no significant effect on tissue water content, MPO activity, MDA concentration of ischemia/reperfusion limb, while 50?μg/kg of bFGF lowered these values by 15 7%, 32 5% and 13 6% ( P <0 05) and 14 7% ( P <0 01), MPO activity augmented by 44 9% and 96 1% ( P <0 01), ATP content decreased by 13 1% ( P <0 05) and 33 3% ( P <0 01) Plasma and tissue MDA concentrations in VEGF 10 group had no significant changes ( P >0 05), while in VEGF 50 group, these values were elevated by 46 4% and 38 6% ( P <0 01) Conclusion bFGF attenuated, while VEGF exacerbated ischemia/reperfusion injury of rat limb significantly, the mechanism of which was probably related to preventing or enhancing lipid peroxide, and increasing or decreasing energy store
文摘We have experimentally studied the growth process of a water-absorbing polymer commonly known as hydro-gel. We took a number of spherical beads, immersed them in pure water, measured their diameters at regular intervals of time and plotted graphs showing the change in volume with the time of immersion, to analyze their swelling properties. We have formulated a dynamical model on the basis of curve-fitting to our experimental data. Our mathematical modelling is devoted solely towards the explanation of the swelling of spherical hydro-gels and we have interpreted our observations on these basis. And finally evaluating the constants of the process, we have shown that the results obtained from our modelling and numerical simulation exactly match the experimental data. The justification of this new approach lies in its successful application for the complete explanation of our observations through numerical and analytical ways.
文摘A stereocontrolled construction of the side chain of brassinosteroid was developed via the separated dialkylation and the tandem dialkylation of the pyranone moiety as the key step.
文摘Lanthanum malonate crystals were grown by single tube ionic diffusion through silica gel. The crystallinity of the grown crystals was analyzed by powder X-ray diffraction studies. Fourier transform infrared spectroscopy （FTIR） and fourier transform （FT） Raman studies confirmed the presence of functional groups in the title compound. The optical band gap energy of the material was extracted from diffuse reflectance spectrum.
