检索结果-南通市图书馆

X-ray Powder Diffraction Pattern of Bi_4(SiO_4)_3

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1997年第2期13卷 145-148页

作者： Hongchao LIU Changlin KUO (shanghai institute of Ceramics, chinese academy of sciences, shanghai 200050, china) shanghai institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China

In cooperation with figure-of-merits the Rietveld analysis can appraise both angular and intensity data of powder diffraction. In this work, X-ray diffraction pattern of Bi4(SiO4)3 was redetermined with intensity figure-of-merits, which qualify agreement between observed and calculated relative intensities. F30 is 158.90 (0.0059, 32), intensity figure of merit Rint is 8.7, I20(17), 8.0. The values of figure-of-merits show that the data of JCPDS cards are distorted. Both the experimental and calculated peak positions and heights are listed in detail.

关键词： SiO4 X-ray Powder Diffraction Pattern of Bi4 Bi

Valence Distribution in AT_xV_(6-X)O_(11) Compounds

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1999年第6期15卷 551-554页

作者： Hongchao LIU and Changlin KUO(shanghai institute of Ceramics, chinese academy of sciences, shanghai 200050, china) chinese Acad Sci Shanghai Inst Ceram Shanghai 200050 Peoples R China

The distribution of trivalent and tetravalent cations in several ATxV6-xO11 compounds was quantitatively studied by the bond valence method. In SrV6O11, the M(3) sites were mainly occupied by trivaient cations; while M(1) and M(2) sites were shared by trivalent and tetravalent cations, the relative content of tetravalent at M(1) sites was higher than at M(2) sites. During substitution process, the trivalent cations preferred to occupy M(3) sites, tetravalent ones preferred to occupy M(2) sites. The occupancy of trivalent and tetravalent cations at M sites would change with the substitution

关键词： AT X)O Valence Distribution in AT_xV Compounds

Serine racemase expression in mouse cerebral cortex after permanent focal cerebral ischemia

在线全文

学校读者我要写书评

暂无评论

Acta Pharmacologica Sinica 2004年第4期25卷 38-43页

作者： Li-zhenWANG, Xing-zu ZHU2 Department of Pharmacology, shanghai institute of Materia Medica, shanghai institutes for Biological sciences, chinese academy of sciences, shanghai 201203, china Department of Pharmacology Shanghai Institute of Materia MedicaShanghai Institutes for Biological Sciences Chinese Academy of Sciences

AIM: To study the alterations of the expressions of serine racemase in C57BL/6 mouse brain after permanent focal cerebral ischemia. METHODS: The mRNA level and the protein level of serine racemase were assayed by semiquantitative reverse transcription polymerase chain reaction (RT-PCR) and Western blot, respectively. The amount of D-serine and L-serine were measured by HPLC. RESULTS: High levels of serine racemase were constitutively expressed in the normal cortex of mouse. At early stage after middle cerebral artery occlusion (MCAO), no significant change in expression of serine racemase was observed in temporoparietal cortex in ipsila- teral hemisphere. However, delayed transient decreases of serine racemase in both mRNA and protein levels were detected from d 6 to d 10 after ischemia. Correspondingly, D-serine concentration also declined in the ipsilateral cortex during this period when compared with the D-serine level in the contralateral cortex. CONCLUSION: Delayed decreases in serine racemase expression and D-serine level occurred in the temporoparietal cortex at the late stage after focal cerebral ischemia.

关键词： D-serine L-serine serine racemase inbred C57BL mice brain ischemia

Cytotoxicity of carbon nanotubes

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china Chemistry 2008年第11期51卷 1021-1029页

作者： ZHU Ying1,2 & LI WenXin1 1 Laboratory of Nano-biology and Medicine, shanghai institute of Applied physics, chinese academy of sciences, shanghai 201800, china 2 Graduate School of chinese academy of sciences, Beijing 100049, china 1. Laboratory of Nano-biology and Medicine Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China 2. Graduate School of chinese academy of sciences Beijing 100049 China

With large-scale production and application at large scale, carbon nanotubes (CNTs) may cause ad-verse response to the environment and human health. Thus, study on bio-effects and safety of CNTs has attracted great attention from scientists and governments worldwide. This report briefly summa-rizes the main results from the in vitro toxicity study of CNTs. The emphasis is placed on the descrip-tion of a variety of factors affecting CNTs cytotoxicity, including species of CNTs, impurities contained, lengths of CNTs, aspect ratios, chemical modification, and assaying methods of cytotoxicity. However, experimental information obtained thus far on CNTs' cytotoxicity is lacking in comparability, and some-times there is controversy about it. In order to assess more accurately the potential risks of CNTs to human health, we suggest that care should be taken for issues such as chemical modification and quantitative characterization of CNTs in cytotoxicity assessment. More importantly, studies on physical and chemical mechanisms of CNTs' cytotoxicity should be strengthened; assaying methods and evaluating criteria characterized by nanotoxicology should be gradually established.

关键词： carbon nanotubes (CNTs) cell bio-security

Conus Peptides-A Rich Pharmaceutical Treasure

在线全文

学校读者我要写书评

暂无评论

Acta Biochimica et Biophysica Sinica 2004年第11期36卷 713-723页

作者： Cheng-Zhong WANG and Cheng-Wu CHIinstitute of Biochemistry and Cell Biology, shanghai institute of Biological sciences, the chinese academy of sciences, shanghai 200031, china institute of Neuroscience, the chinese academy of sciences, shanghai 200031, china institute of Protein Research, Tongji University, shanghai 200092, china institute of Biochemistry and Cell Biology Shanghai Institute of Biological Sciences the Chinese Academy of Sciences institute of Neuroscience the Chinese Academy of Science institute of Protein Research Tongji University

Marine predatory cone snails (genus Conus) with over 500 species represent what is arguably the largest single genus of marine animals alive today. All Conus are venomous and utilize a complex mixture of Conus peptide... 详细信息

关键词： Conus peptide conotoxin neuropathic disorder pharmaceutical potency

Formation and Oxidation Resistance of Silicide Coatings for Mo and Mo-Based Alloys

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2001年第4期17卷 479-481页

作者： Yu WANG , Yunpeng LI and Xingfang HU shanghai institute of Ceramics, chinese academy of sciences, shanghai 200050, china chinese Acad Sci Shanghai Inst Ceram Shanghai 200050 Peoples R China

The forming process of silicide coatings on pure Mo and Mo-base alloys, obtained by the gas- phase deposition method. has been studied by examining the microstructure of coatings and the relationship between coating thickness and process parameters. It was shown that the growth of coatings was diffusion-controlled, the diffusion of silicon to be coated into Mo or Mo-base alloys was mainly responsible for the formation of silicide. The relationship between initial silicide thickness and oxidation resistance was also investigated, and the equation of service life of the coatings at high temperature in air is presented.

关键词： Mo Formation and Oxidation Resistance of Silicide Coatings for Mo and Mo-Based Alloys

Structural and microstructural transformations in Bi_2Sr_2Ca_(1-x)Y_xCu_2O_(8+y) system

在线全文

学校读者我要写书评

暂无评论

chinese Science Bulletin 1997年第3期42卷 192-196页

作者： SONG Chengyu, WEN Shulin and CHE Guangcan1. shanghai institute of Ceramics, chinese academy of sciences, shanghai 200050, china 2. State Key Laboratory of Supercon-ductivity, institute of physics, chinese academy of sciences, Beijing 100080, china shanghai institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China

SINCE the discovery of high-Tc superconductors, experiments have revealed that the phase diagrams of La2-xSrxCuO4 and YBa2Cu3O6+x resemble each other. The antiferromagnetic phase is commonly situated in the vicinity o... 详细信息

关键词： Bi2Sr2Ca1-xYxCu2Oy substitution structural transformation.

Preparation and Characterization of Sol-gel Derived CH_3SiO_(3/2)-SiO_2 Thick Film

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1998年第6期14卷 523-526页

作者： Bing CAO and Congshan ZHU(shanghai institute of Optics and Fine Mechanics, chinese academy of sciences, shanghai 201800, china) shanghai institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China

A large size CH3SiO3/2-SiO2 self sustained film with the thickness ranging from 50 to 1000 μm was prepared through sol-gel method by adopting CH3Si(OC2H5)3 and Si(OC2H5) as *** this paper, the preparation processes of this thick film are discussed in detail and XRD technique was adopted for the identification of oligomer solution. Also, IR and AFM techniques were used to investigate the film structure and surface morphology

关键词： Preparation and Characterization of Sol-gel Derived CH3SiO MTES CH

Transverse patterns and spatiotemporal instability of a photorefractive oscillator

在线全文

学校读者我要写书评

暂无评论

chinese Science Bulletin 1997年第9期42卷 724-729页

作者： ZHUANG Jun and TAN Weihan1. shanghai institute of Optics and Fine Mechanics, chinese academy of sciences, shanghai 201800, china 2. shanghai University, shanghai 201800, china shanghai institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai China shanghai University Shanghai China

IN time realm,instability and chaos phenomena of a nonlinear optical system have been dis-cussed *** recent years,as much interest was attracted to the transverse ef-fects in nonlinear optics,the study was developed t... 详细信息

关键词： photorefractive oscillator spatiotemporal instability transverse patterns.