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A NOVEL METHOD FOR CHARACTERIZING THE WHOLE PROCESS OF POLYMER GELATION

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Chinese Journal of Polymer Science 2001年第4期19卷 335-339页

作者： Qiang Chen Xian-min Zhang Guo-wei Wang Jian Xu State Key Laboratory of Polymer Physics & Chemistry, center for molecular Science, Institute of Chemistry, Chinese Academy of Sciences {2. 100080, china Department of Information & Electronic Engineering Zhejiang university, Hangzhou 31002., china Tjanjin Polytechnic university,Tianjin 300160 中科院化学所高分子物理与化学国家重点实验室北京浙江大学浙江杭州

A novel method was established to investigate the gelation process of polymers. The change of refractive index of a polymer system during gelation was determined in situ in a prismatic cell. It can give reliable information on the whole gelation process. The apparatus and the execution of this technique are illustrated and the error is also discussed.

关键词： gelation process in situ technique refractive index

ECSTM study of adsorption of C_(60),C_(70),C_(86) and Y@C_(82. on Au(111)

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Science china Chemistry 2010年第8期53卷 1705-1710页

作者： SU GuiJin1,JIA ManKe1,GAN LiHua2.& SHI RuiFang1 1State Key Laboratory of Environmental Chemistry and Ecotoxicology Research center for Eco-Environmental Sciences,Chinese Academy of Sciences,beijing 100085,{2. 2.chool of Chemistry and Chemical Engineering,Southwest university,Chongqing 400715,{2. State Key Laboratory of Environmental Chemistry and Ecotoxicology Research center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing China School of Chemistry and Chemical Engineering Southwest University Chongqing China

The adsorption of a variety of fullerenes (C60,C70,C86,Y@C82. on Au(111) electrode surfaces was comprehensively investigated in 0.1 M HClO4 by electrochemical scanning tunneling microscopy (ECSTM).In the ordered C60's adlayer,C60 molecules formed either (2.1/3) × 2.3～(1/3))or "in-phase" *** high resolution STM image shows that the C60 cage is not simply round but shows a bifurcated *** adsorption orientation of C60 on Au(111) is tentatively *** the ordered C70's adlayer,the perpendicular fullerene molecules are the main adsorption mode and form (2.3～(1/3) × 2.3～(1/3)) ***,for C86 and Y@C82.the ordered adlayer could not be obtained on Au(111) under the present *** differences may be due to the different molecular shapes and sizes,and the encapsulated metal atom which affects the lattice matches with the *** adsorption of fullerene molecules on Au(111) from disorder to order could be tuned simply by steering the dimensional sizes or shapes of the fullerenes used.

关键词： C60 C70 C86 Y@C82 ECSTM Au(111)

氢分子分立区和连续区(11.0—19.0 eV)的光学振子强度研究

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物理学报 1999年第5期48卷 816-824页

作者：钟志萍张卫华徐克尊凤任飞李家明清华大学现代应用物理系单原子分子测控科学与技术研究中心中国科学技术大学近代物理系中国科学院物理研究所

利用通道规律，并考虑了转动分布对跃迁峰型的影响，对测量得到的绝对氢分子光吸收谱进行了分析．文中逐个确定了１１０—１５０ｅＶ各振动态的振子强度，并得到了Ｂ′１Σ＋ｕ的解离强度．同时，利用多重散射Ｘα自洽场方法计算了... 详细信息

利用通道规律，并考虑了转动分布对跃迁峰型的影响，对测量得到的绝对氢分子光吸收谱进行了分析．文中逐个确定了１１０—１５０ｅＶ各振动态的振子强度，并得到了Ｂ′１Σ＋ｕ的解离强度．同时，利用多重散射Ｘα自洽场方法计算了氢分子分立区和连续区（１１０—１９０ｅＶ）的光吸收谱．通过计算值和实验绝对测量值的比较可以说明，在自洽层次。

关键词：氢分子振动光谱连续区分立区光学振子强度

Posttranslational modulation on the biological activities of molecular chaperones

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Science china(Life Sciences) 2009年第6期52卷 515-520页

作者： CHANG ZengYi center for Protein Science,School of Life Science,National Laboratory of Protein Engineering and Plant Genetic Engineering,Peking university,{2. 100871,china center for Protein Science School of Life Science National Laboratory of Protein Engineering and Plant Genetic Engineering Peking University Beijing China

molecular chaperones are a family of proteins that were first noticed to exist about 45 years ago from their increased transcription under heat shock *** a result,the regulation of their encoding genes has been subject to extensive *** studies revealed that the biological activities of molecular chaperones can also be effectively modulated at the protein *** ways of modulation so far elucidated include allosteric effect,covalent modification,protein-protein interaction,and con-formational alteration induced by such macro-environmental conditions as temperature and *** latter aspects were reviewed *** here is the importance of such immediate structural alterations that lead to an immediate activity increase,providing the immediate protection needed for the cells to survive the stress conditions.

关键词： molecular chaperone activity modulation sHsp Hsp60 Hsp70 Hsp90 Hsp100 HdeA DegP

Synthesis and characterization of Au@Pt nanoparticles

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Science Bulletin 2005年第17期 32-34页

作者： ZHAO Dan, WU Gang & XU Boqing Innovative Catalysis Program, Key Lab of Organic Optoelectronics & molecular Engineering, Department of Chemistry, tsinghua university,{2.

Aucore-Ptshell (Au@Pt) nanoparticles were syn-thesized at room temperature by reducing K2.tCl6 with hy-drogen in the solution containing Au colloids and polyvi-nylpyrrolidone (PVP). The particles obtained were charac-terized with UV-Vis, TEM and XPS techniques. UV-Vis spectra show that the surface plasmon absorption feature of Au colloids is significantly reduced with increasing the amount of reduced Pt. TEM images that the metals are found always appear as spherical nanoparticles and their sizes grow apparently due to the reduction of PtCl62. ions, indicating that Pt is deposited from solution onto Au particle surface and forms a Pt-layer with uniform thickness. In the XPS spectra, the signals of Au metal decrease due to the re-ductive deposition of Pt on the surface of the Au colloids. UV-Vis and XPS data are consistent in showing that when the amount of Pt in the AuPt colloids is increased to reach an overall atomic ratio of Pt/Au = 2. the Pt deposits form a shell covering completely the surface of Au particles, demonstrat-ing the core-shell structure of the synthesized AuPt particles.

关键词： core-shell metal structure metal colloids gold platinum.

Protein P37 of mycoplasma hyorhinis induces secretion of TNF-αfrom human peripheral blood mononuclear cells

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Chinese Science Bulletin 2003年第7期48卷 658-662页

作者： NING Jinying, HUANG Su, WU Jian, MENG Lin & SHOU Chengchao Department of Biochemistry and molecular Biochemistry, School ofOncology, Peking university and {2. Institute for Cancer Research, {2. 100034, china Department of Biochemistry and molecular Biochemistry School of Oncology Peking University and Beijing Institute for Cancer Research Beijing 100034 China

High mycoplasmal infection ratio in gastric cancer tissues suggests a possible association between my-coplasma infection and tumorigenesis. Because TNF-a plays an important role in carcinogenesis caused by microbes in-fection and P37 is a major immunogen of mycoplasma hy-orhinis (M. hyor.), investigating whether P37 could induceexpression and secretion of TNF-a will be very significant to elucidate the possible molecular mechanism of gastric car-cinogenesis involved with M. hyor. At the present study, we cloned full gene of p37 by PCR and mutated the 7 codes of TGA into TGG firstly, then expressed the P37 protein suc-cessfully with pGEX-4T-1 vector in E. coli, which was veri-fied with Western blot. By RT-PCR and sensitive L92. cell toxic assay, we found that P37 protein could induce expres-sion and secretion of TNF-a from human peripheral bloodmononuclear cells, and the inducing activity of P37 could be dramatically blocked by McAb PD4. These results suggestthat the induction of TNF-a secretion by P37 probably plays an important role in diseases caused by M. hyor. infectionand needs to be further investigated.

关键词：胃癌人外周血单核细胞支原体蛋白质 TNF-α 发病机制

THE MACQM CALCULATION OF THE TOTAL ENERGY CURVE OF THE BODY-centerED CUBIC STRUCTURE OF THE H9~- CLUSTER

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原子与分子物理学报 1997年第4期 60-63页

作者： Gou Qingquan Zhang Jianping Li Ping Institude of atomic and molecular Science at High Temperature and High Pressure Sichuan Union {2., Chengdu 610065 china

ＴＨＥＭＡＣＱＭＣＡＬＣＵＬＡＴＩＯＮＯＦＴＨＥＴＯＴＡＬＥＮＥＲＧＹＣＵＲＶＥＯＦＴＨＥＢＯＤＹ－ＣＥＮＴＥＲＥＤＣＵＢＩＣＳＴＲＵＣＴＵＲＥＯＦＴＨＥＨ－９ＣＬＵＳＴＥＲＧｏｕＱｉｎｇｑｕａｎＺｈａｎｇＪｉａｎ... 详细信息

ＴＨＥＭＡＣＱＭＣＡＬＣＵＬＡＴＩＯＮＯＦＴＨＥＴＯＴＡＬＥＮＥＲＧＹＣＵＲＶＥＯＦＴＨＥＢＯＤＹ－ＣＥＮＴＥＲＥＤＣＵＢＩＣＳＴＲＵＣＴＵＲＥＯＦＴＨＥＨ－９ＣＬＵＳＴＥＲＧｏｕＱｉｎｇｑｕａｎＺｈａｎｇＪｉａｎｐｉｎｇＬｉＰｉｎｇＩｎｓｔｉｔｕ...

关键词： MACQM Body-centered cubic structure Cluster Energy

^(103)Pd-induced apoptosis of proliferative smooth muscle cells in bile ducts of dogs:significance and effects on related genes

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Hepatobiliary & Pancreatic Diseases International 2007年第5期6卷 521-526页

作者： Gui-Jin He,Fa-Qiang Yu,Rong Wu,Qin-Yi Gao,Shu-He Xu,Hong Gao, Wei-Guo Jiang,Tao Jiang and Xian-Wei Dai Department of General Surgery,Second Affiliated Hospital(Shengjing Hospital),china Medical university,Shenyang 110004,china,Radiotherapy center,Second Affiliated Hospital(Shengjing Hospital),china Medical university,Shenyang 110004,china,Pediatrics Surgery Laboratory,Second Affiliated Hospital(Shengjing Hospital),china Medical university,Shenyang 110004,china,Department of Pathology,Second Affiliated Hospital(Shengjing Hospital),china Medical university,Shenyang 110004,china Isotope Unit,First Affiliated Hospital,china Medical university,Shenyang 110001,china and Isotope Research Institute,china Institute of atomic Energy,beijing 100050,china Department of General Surgery Second Affiliated Hospital (Shengjing Hospital) China Medical University Shenyang 110004 China. 23318199@***

BACKGROUND:With the objective of developing a locally- produced radioactive stent,the present study used in vivo animal experiments to explore apoptosis of proliferative smooth muscle cells resulting from facilitation of the expression of genes caused byγ-radiation in order to prevent bile duct *** therefore explored the effects and significance ofγ-radiation on the activity of caspase-3,Fas and Bcl-2.genes in apoptosis of proliferative smooth muscle cells in the bile duct walls of dogs. METHODS:Twelve dogs were randomly divided into 2.groups(6 in each group).A postinjury bile duct stenosis model was established and radioactive 103 Pd( 103 palladium) or ordinary bile duct stents were implanted into the bile *** staining,RT-PCR and immunohistochemistry were used to detect the proliferation and apoptosis of bile duct smooth muscle cells in proliferative endomembrane and the expression of related caspase-3,Bcl-2.and Fas genes. RESULTS:The expression of caspase-3 and Fas genes in the bile duct tissues of dogs with radioactive stents was higher than that of dogs with ordinary *** was significant apoptosis of proliferative smooth muscle cells in the bile *** expression of the Bcl-2.gene in the bile duct tissues of dogs with radioactive stents was lower than that in those with ordinary *** was significant apoptosis of proliferative smooth muscle cells in the dogs with low Bcl-2.gene expression. CONCLUSIONS:Radiation increases the activity of caspase-3 and Fas genes and is associated with apoptosis. The radioactive 103 Pd stent may facilitate apoptosis of proliferative smooth muscle cells in the bile ducts of dogs by activating these *** Bcl-2.gene expression level is correlated with the occurrence of apoptosis and the radiosusceptibility of cells.

关键词： radioactive 103 Pd stent γ-radiation caspase-3 gene Fas gene Bcl-2.gene apoptosis

LEAFY HEAD2.which encodes a putative RNA-binding protein,regulates shoot development of rice

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Cell Research 2006年第3期16卷 267-276页

作者： Guo Sheng Xiong~(1,3) Xing Ming Hu~2.Yong Qing Jiao~1 Yan Chun Yu~1 Cheng Cai Chu~1 Jia Yang Li~1 Qian Qian~2.Yong Hong Wang~11 State Key Laboratory of Plant Genomics and National center for Plant Gene Research,Institute of Genetics and Developmental Biology,Chinese Academy of Sciences,beijing 100101,{2. 2.State Key Laboratory of Rice Biology,{2. National Rice Research Institute,Chinese Academy of Agricultural Sciences,Hangzhou 310006,{2. 3 Graduate university of Chinese Academy of Sciences,beijing 100049,{2. State Key Laboratory of Plant Genomics and National center for Plant Gene Research Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing China Graduate university of Chinese Academy of Sciences Beijing China State Key Laboratory of Rice Biology China National Rice Research Institute Chinese Academy of Agricultural Sciences Hangzhou China

During vegetative development,higher plants continuously form new leaves in regular spatial and temporal *** with abnormal leaf developmental patterns not only provide a great insight into understanding the regulatorymechanism of plant architecture,but also enrich the ways to its modification by which crop yield could be ***,we reported the characterization of the rice leafy-head2.(lhd2. mutant that exhibits shortened plastochron,dwarfism,reduced tiller number,and failure of phase transition from vegetative to reproductive *** and histologicalstudy revealed that the rapid emergence of leaves in lhd2.was resulted from the rapid initiation ofleafprimordia whereasthe reduced tiller number was a consequence of the suppression of the tiller bud *** molecular and geneticanalysis showed that LHD2.encodes a putative RNA binding protein with 67% similarity to maize *** ofgenome-scale expression profiles between wild-type and lhd2.plants suggested that LHD2.may regulate rice shoot devel-opment through KNOXand hormone-related *** similar phenotypes caused by LHD2.mutation and the conservedexpression pattern of LHD2.indicated a conserved mechanism in controlling the temporal leaf initiation in grass.

关键词： phyllotaxy plastochron LHD2 RNA-binding protein stem elongation plant architecture Oryza sativa L