Profile of Zhang Heping Born in 1964, Zhang Heping is a professional painter and a member of the Chinese Artists' Association, He graduated from Shandong Art College.
Gold nanoparticles with different morphologies, such as spindle, octahedron, and decahedron were obtained by using different molar ratios of HAuCl4/HEPES in the presence and absence of surfactants at room temperature....Gold nanoparticles with different morphologies, such as spindle, octahedron, and decahedron were obtained by using different molar ratios of HAuCl4/HEPES in the presence and absence of surfactants at room temperature.These nanoparticles were characterized by X-ray diffraction（XRD）, transmission electron microscopy（TEM）, high-resolution transmission electron microscopy（HRTEM）, scanning electron microcopy（SEM）, energy-dispersive X-rays analysis（EDX）, and selected area electron diffraction（SAED）.The kinetics of the formation of gold nanoparticles in HEPES buffer was studied by UV-visible spectrophotometer.The formation of gold nanoparticles was strongly dependent on the concentration of HEPES and pH value.The surfactants play a crucial role in the size and shape controlled synthesis of gold nanoparticles.展开更多
The formation of calcium phosphate phases is extremely important in a biomedical engineering context. These phosphates are used in many applications, such as grafts, drug-delivery processes and evaluation of the bioac...The formation of calcium phosphate phases is extremely important in a biomedical engineering context. These phosphates are used in many applications, such as grafts, drug-delivery processes and evaluation of the bioactivity of metallic surfaces. Considering this scenario, it is useful to evaluate the thermodynamic conditions for the precipitation of phosphates of biomedical interest, mainly hydroxyapatite. In this work, we investigate the effects of two important factors using a thermodynamic framework: 1) carbon dioxide partial pressure;and 2) buffer type (2-Amino-2-hydroxy- methyl-propane-1,3-diol, known as TRIS and 2-[4-(2-hydroxyethyl)piperazin-1-yl] ethanesulfonic acid, also called HEPES), on the driving force behind the precipitation of calcium phosphates in simulated body fluids. The in silico results show that the pH value is governed by carbon dioxide content, as expected to occur in vivo. Moreover, the buffers can deplete the free calcium available in solution and, consequently, can cause difficulties in the calcium phosphate precipitation.展开更多
Previous study has shown that the hermaproditicfish Rivulus ocellatus marmoratus is a suitablemodel for experimental hepatocarcinogenesis.Forfurther studies on development of this fish as ananimal model for chemical c...Previous study has shown that the hermaproditicfish Rivulus ocellatus marmoratus is a suitablemodel for experimental hepatocarcinogenesis.Forfurther studies on development of this fish as ananimal model for chemical carcinogenesis,sensitivity of thyroid carcinogens was testedand evaluated.Fish larvae,3-5 day-old。展开更多
EPES has proved to stabilize M intermediate of Bacteriorhodopsin. Absorp-tion and Raman spectra showed that there was a more stable form of M intermedi-ate in BR-HEPES solution. It was found by SPS that there were two...EPES has proved to stabilize M intermediate of Bacteriorhodopsin. Absorp-tion and Raman spectra showed that there was a more stable form of M intermedi-ate in BR-HEPES solution. It was found by SPS that there were two main interme-diates . M and O , existing in BR-HEPES solution.展开更多
文摘Profile of Zhang Heping Born in 1964, Zhang Heping is a professional painter and a member of the Chinese Artists' Association, He graduated from Shandong Art College.
基金supports from the Program for Excellent Talents of the Department of Education of Hubei Province, China (No. Q20081504)the Area of Excellence Scheme administered by the University Grant Committee and the University of Hong Kong (No.AoE/ P-10/ 01)
文摘Gold nanoparticles with different morphologies, such as spindle, octahedron, and decahedron were obtained by using different molar ratios of HAuCl4/HEPES in the presence and absence of surfactants at room temperature.These nanoparticles were characterized by X-ray diffraction（XRD）, transmission electron microscopy（TEM）, high-resolution transmission electron microscopy（HRTEM）, scanning electron microcopy（SEM）, energy-dispersive X-rays analysis（EDX）, and selected area electron diffraction（SAED）.The kinetics of the formation of gold nanoparticles in HEPES buffer was studied by UV-visible spectrophotometer.The formation of gold nanoparticles was strongly dependent on the concentration of HEPES and pH value.The surfactants play a crucial role in the size and shape controlled synthesis of gold nanoparticles.
文摘The formation of calcium phosphate phases is extremely important in a biomedical engineering context. These phosphates are used in many applications, such as grafts, drug-delivery processes and evaluation of the bioactivity of metallic surfaces. Considering this scenario, it is useful to evaluate the thermodynamic conditions for the precipitation of phosphates of biomedical interest, mainly hydroxyapatite. In this work, we investigate the effects of two important factors using a thermodynamic framework: 1) carbon dioxide partial pressure;and 2) buffer type (2-Amino-2-hydroxy- methyl-propane-1,3-diol, known as TRIS and 2-[4-(2-hydroxyethyl)piperazin-1-yl] ethanesulfonic acid, also called HEPES), on the driving force behind the precipitation of calcium phosphates in simulated body fluids. The in silico results show that the pH value is governed by carbon dioxide content, as expected to occur in vivo. Moreover, the buffers can deplete the free calcium available in solution and, consequently, can cause difficulties in the calcium phosphate precipitation.
文摘Previous study has shown that the hermaproditicfish Rivulus ocellatus marmoratus is a suitablemodel for experimental hepatocarcinogenesis.Forfurther studies on development of this fish as ananimal model for chemical carcinogenesis,sensitivity of thyroid carcinogens was testedand evaluated.Fish larvae,3-5 day-old。
文摘EPES has proved to stabilize M intermediate of Bacteriorhodopsin. Absorp-tion and Raman spectra showed that there was a more stable form of M intermedi-ate in BR-HEPES solution. It was found by SPS that there were two main interme-diates . M and O , existing in BR-HEPES solution.
