Chemical Research in Chinese Universities最新文献_第9页

Iodine Determination by Microwave Plasma Torch Atomic Emission Spectrometer Coupled with Online Preconcentration Vapor Generation Technique 微波等离子体炬原子发射光谱仪-在线预浓缩蒸汽生成技术测定碘

IF 3.1 4区化学

Chemical Research in Chinese Universities Pub Date : 2008-09-01 DOI: 10.1016/S1005-9040(08)60115-4

Yan-qun FEI , Gui-min LUO , Guo-dong FENG , Huan-wen CHEN , Qiang FEI , Yan-fu HUAN , Qin-han JIN

引用次数: 4

Preparation and Characterization of Biodegradable Polylactide(PLA) Microspheres Encapsulating Ginsenoside Rg3 包封人参皂苷Rg3的可生物降解聚乳酸微球的制备与表征

IF 3.1 4区化学

Chemical Research in Chinese Universities Pub Date : 2008-09-01 DOI: 10.1016/S1005-9040(08)60124-5

Cheng-bai LIU, Di ZHANG, De-guan LI, Dan JIANG, Xia CHEN

引用次数: 14

Hydrothermal Synthesis, Crystal Structure and Spectroscopic Investigations of [Y(C6NO2H5)3(H2O)2]n(1.5nZnCl4)•nH2O with Unprecedented Polycationic Chains 空前多阳离子链[Y(C6NO2H5)3(H2O)2]n(1.5nZnCl4)•nH2O的水热合成、晶体结构和光谱研究

IF 3.1 4区化学

Chemical Research in Chinese Universities Pub Date : 2008-09-01 DOI: 10.1016/S1005-9040(08)60111-7

Xiao-niu FANG, Wen-tong CHEN, Dong-sheng LIU

{"title":"Hydrothermal Synthesis, Crystal Structure and Spectroscopic Investigations of [Y(C6NO2H5)3(H2O)2]n(1.5nZnCl4)•nH2O with Unprecedented Polycationic Chains","authors":"Xiao-niu FANG, Wen-tong CHEN, Dong-sheng LIU","doi":"10.1016/S1005-9040(08)60111-7","DOIUrl":"10.1016/S1005-9040(08)60111-7","url":null,"abstract":"<div>A new heterometallic 4f-3d complex [Y(C6NO2H5)3(H2O)2]n(1.5nZnCl4). nH2O(1), was synthesized via a hydrothermal reaction and structurally characterized. Complex 1 crystallized in the monoclinic system with space group P21/c: a=0.94847(9) nm, b=2.0947(2) nm, c=1.6001(2) nm, β=104.467(2)°, V-3.0781(5) nm3, Mr=823.04, Dc=1.776 g/cm3, S=1.009, μ(Mo Kα)=3.603 mm−1, F(000)=1632, R=0.0787, and wR=0.2273. Complex 1, with four formula units in a cell, was characteristic of a one-dimensional polycationic chain-like structure. Photolumincscent investigation showed that the title complex displayed a strong emission in the blue region, which was attributed to the intraligand π-π* transition of the nicotinic ligands. Optical absorption spectrum of complex 1 revealed the presence of a wide optical bandgap of 4.17 eV.</div>","PeriodicalId":9785,"journal":{"name":"Chemical Research in Chinese Universities","volume":"24 5","pages":"Pages 529-533"},"PeriodicalIF":3.1,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-9040(08)60111-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56328015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Ultrasonication on Optical Properties and Electronic States of Conjugated Polymer MEH-PPV 超声对共轭聚合物MEH-PPV光学性质和电子态的影响

IF 3.1 4区化学

Chemical Research in Chinese Universities Pub Date : 2008-09-01 DOI: 10.1016/S1005-9040(08)60137-3

Meng WU, Gui-zhong YANG, Meng WANG, Wei-zhi WANG, Min WANG, Tian-xi LIU

{"title":"Effect of Ultrasonication on Optical Properties and Electronic States of Conjugated Polymer MEH-PPV","authors":"Meng WU, Gui-zhong YANG, Meng WANG, Wei-zhi WANG, Min WANG, Tian-xi LIU","doi":"10.1016/S1005-9040(08)60137-3","DOIUrl":"10.1016/S1005-9040(08)60137-3","url":null,"abstract":"<div>Poly[2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene](MEH-PPV) solutions with different concentrations were prepared in chloroform for different ultrasonication times. The ultraviolet absorption and photoluminescence(PL) spectra of the MEH-PPV solutions were measured, and the electronic states of the polymer chains under different experimental conditions were studied. The results showed that the effects of ultrasonication on the dilute and concentrated solutions were different. After ultrasonication, the intensity of the absorption peak at 280 nm significantly decreased, relative to the absorption peak at 500 nm for both dilute and concentrated solutions, indicating that the proportion of the two excited states in the polymer chains had changed. For dilute MEH-PPV solutions, the blue-shifted absorption(at about 500 nm) and PL spectra show that ultrasonication also led to polymer chain degradation and thus shortened the effective conjugation length. For concentrated solutions, however, the peak positions of the absorption spectra remained unchanged. In addition, the effects of the solution temperatures on the optical spectra for the MEH-PPV solutions were also discussed.</div>","PeriodicalId":9785,"journal":{"name":"Chemical Research in Chinese Universities","volume":"24 5","pages":"Pages 653-657"},"PeriodicalIF":3.1,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-9040(08)60137-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56328054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Subunit Characteristics of Pig Pancreas Ferritin Revealed by MALDI-TOF MS and RP-HPLC 利用MALDI-TOF质谱和反相高效液相色谱分析猪胰腺铁蛋白亚基特征

IF 3.1 4区化学

Chemical Research in Chinese Universities Pub Date : 2008-09-01 DOI: 10.1016/S1005-9040(08)60116-6

Lin HUANG , Zhi-cao LIN , Qing LIN , Lian-zhong LUO , He-qing HUANG

{"title":"Subunit Characteristics of Pig Pancreas Ferritin Revealed by MALDI-TOF MS and RP-HPLC","authors":"Lin HUANG , Zhi-cao LIN , Qing LIN , Lian-zhong LUO , He-qing HUANG","doi":"10.1016/S1005-9040(08)60116-6","DOIUrl":"10.1016/S1005-9040(08)60116-6","url":null,"abstract":"<div>Pig pancreas ferritin(PPF) was purified by ultra-centrifugation, ion-exchange chromatography, and native gradient polyacrylamide gel electrophoresis(PAGENG). Sodium dodecyl sulfate(SDS)-PAGE indicates that PPF consists of two subunit types, namely, H(21000) and L(19000) subunits, and its core shows an average element composition of 1698 Fe3+ and 179 phosphate molecules within the hollow shell, giving a 9.5:1 ratio of Fe3+ to phosphate. An off line approach combining reversed-phase high-performance liquid chromatography(RP-HPLC) with matrix-assisted laser desorption ionization time of flight mass spectrometry(MALDI-TOF MS) made the decomposition of PPF shell into H and L subunits for the analysis of mass spectrometry(MS), giving molecular weights of both H(21014.4) and L(18319.9) subunits. Both subunit types were further identified by an approach combining peptide mass fingerprint(PMF) with database search. A ratio of 1H to 2L subunits in PPF was determined by SDS-PAGE, RP-HPLC, and MALDI-TOF MS, respectively. It is well known that the non-covalent interaction of L-L or H-L subunits is stronger than that of H-H subunits in PPF, which may be further used to explain the unclear physiological function between H and L subunits in PPF.</div>","PeriodicalId":9785,"journal":{"name":"Chemical Research in Chinese Universities","volume":"24 5","pages":"Pages 550-556"},"PeriodicalIF":3.1,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-9040(08)60116-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56328226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Catalytic Oxidation of NO over La0.8Sr0.2MnO3 Perovskite La0.8Sr0.2MnO3钙钛矿上NO的催化氧化

IF 3.1 4区化学

Chemical Research in Chinese Universities Pub Date : 2008-09-01 DOI: 10.1016/S1005-9040(08)60130-0

Ying-xian ZHAO, Feng WEI, Ying YU

引用次数: 2

Selective Reduction of 7-Demethylsinomenine 7-去甲基青藤碱的选择性还原

IF 3.1 4区化学

Chemical Research in Chinese Universities Pub Date : 2008-09-01 DOI: 10.1016/S1005-9040(08)60117-8

Yu-feng LI , Qing-min BU , Yi QIAN , Yi PAN , Jian-xin LI , Le-qun HUANG , Hong-jun ZHU

引用次数: 1

Isolation and Purification of Polysaccharides from Cordyceps minlitaris and Its Inhibition on the Proliferation of Rat Glomerular Mesangial Cells 冬虫夏草多糖的分离纯化及其对大鼠肾小球系膜细胞增殖的抑制作用

IF 3.1 4区化学

Chemical Research in Chinese Universities Pub Date : 2008-09-01 DOI: 10.1016/S1005-9040(08)60123-3

A-li HOU, Qing-fan MENG, Jin-shuang AN, Kai ZHU, Yun FENG, Li-rong TENG

{"title":"Isolation and Purification of Polysaccharides from Cordyceps minlitaris and Its Inhibition on the Proliferation of Rat Glomerular Mesangial Cells","authors":"A-li HOU, Qing-fan MENG, Jin-shuang AN, Kai ZHU, Yun FENG, Li-rong TENG","doi":"10.1016/S1005-9040(08)60123-3","DOIUrl":"10.1016/S1005-9040(08)60123-3","url":null,"abstract":"<div>The crude polysaccharide was obtained by means of the decolorization of porphyrized Cordyceps minlitaris stroma with organic solvent, extraction with hot water, precipitation in 80% ethanol, and protein removal with the Sevag method. After purification with Sephadex G-75, two of its components, CMP-1 and CMP-2, were obtained. Through the assay of gel chromatography and polarimetry, CMP-1 was identified as pure polysaccharide. The results demonstrated that CMP-1 had favorable oxidation resistance activity, which could scavenge not only oxygen-free radicals in the self-oxidation system of pyrogallic acid, but also the hydroxide-free radicals in the Fenton system. The study focused on the effects of low, medium, and high dosages of CMP-1 in rat blood serum on the proliferation of glomerular mesangial cells in vitro. Through MTT Colorimetric analysis, the activities were compared among the blank control group and the Niaoduqing positive control group CMP-1 and CMP-2. The results shows that CMP-1 was able to inhibit the proliferation of rat glomerular mesangial cells effectively. Therefore, CMP-1, one component of polysaccharides of Cordyceps minlitaris, was certainly a potential remedy for hyperplastic glomerular nephritis, whose antioxidant activity could slow down the process of chronic renal failure(CRF) to some extent.</div>","PeriodicalId":9785,"journal":{"name":"Chemical Research in Chinese Universities","volume":"24 5","pages":"Pages 584-587"},"PeriodicalIF":3.1,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-9040(08)60123-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56328318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Etoposide Induces Mitochondria-Associated Apoptotic Cell Death in Human Gastric Carcinoma Cells 依托泊苷诱导人胃癌细胞线粒体相关凋亡细胞死亡

IF 3.1 4区化学

Chemical Research in Chinese Universities Pub Date : 2008-09-01 DOI: 10.1016/S1005-9040(08)60126-9

Jing-hua LI , Yue CHEN , Jia-si WANG , Wei KONG , Ying-hua JIN

{"title":"Etoposide Induces Mitochondria-Associated Apoptotic Cell Death in Human Gastric Carcinoma Cells","authors":"Jing-hua LI , Yue CHEN , Jia-si WANG , Wei KONG , Ying-hua JIN","doi":"10.1016/S1005-9040(08)60126-9","DOIUrl":"10.1016/S1005-9040(08)60126-9","url":null,"abstract":"<div>Recent observations indicate that the resistance of apoptosis is an important process of tumor metastasis and metastases are the cause of 90% of human cancer death. Etoposide, a semisynthetic derivative of the podophyllotoxins, is a clinically used anti-cancer reagent, but the effects of it on metastatic gastric carcinoma cells are totally unknown. In this study, etoposide induced apoptotic cell death in human gastric adenocarcinoma cell line SGC-7901, derived from metastatic lymph nodes, as evidenced by the analysis of DNA fragmentation, apoptotic body formation, caspase activation, and apoptosis specific changes in cell morphology is demonstrated. The depolarization of mitochondrial membrane and the release of cytochrome c were most early events in etoposide treated SGC-7901 cells, and were followed by caspase-3 activation and PARP cleavage. Caspase-8 activation was not detected under the same condition. Thus, it was proposed that etoposide induces caspase-associated apoptotic cell death in human metastatic gastric carcinoma, which is initiated by mitochondrial cytochrome c release.</div>","PeriodicalId":9785,"journal":{"name":"Chemical Research in Chinese Universities","volume":"24 5","pages":"Pages 597-602"},"PeriodicalIF":3.1,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-9040(08)60126-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56328362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Low Temperature Heat Capacities and Thermodynamic Properties of Zinc L-Threonate Zn(C4H7O5)2(s) by Adiabatic Calorimetry 绝热量热法研究l -苏酸锌(C4H7O5)2(s)的低温热容和热力学性质

IF 3.1 4区化学

Chemical Research in Chinese Universities Pub Date : 2008-09-01 DOI: 10.1016/S1005-9040(08)60127-0

Jing-tao CHEN , You-ying DI , Zhi-cheng TAN , San-ping CHEN , Sheng-li GAO

{"title":"Low Temperature Heat Capacities and Thermodynamic Properties of Zinc L-Threonate Zn(C4H7O5)2(s) by Adiabatic Calorimetry","authors":"Jing-tao CHEN , You-ying DI , Zhi-cheng TAN , San-ping CHEN , Sheng-li GAO","doi":"10.1016/S1005-9040(08)60127-0","DOIUrl":"10.1016/S1005-9040(08)60127-0","url":null,"abstract":"<div>Low-temperature heat capacities of the solid compound Zn(C4H7O5)2(s) were measured in a temperature range from 78 to 374 K, with an automated adiabatic calorimeter. A solid-to-solid phase transition occurred in the temperature range of 295—322 K. The peak temperature, the enthalpy, and entropy of the phase transition were determined to be (316.269±1.039) K, (11.194±0.335) kJ·mol-1, and (35.391±0.654) J·K-1·mol-1, respectively. The experimental values of the molar heat capacities in the temperature regions of 78—295 K and 322—374 K were fitted to two polynomial equations of heat capacities(Cp,m) with reduced temperatures(X) and [X = f(T)], with the help of the least squares method, respectively. The smoothed molar heat capacities and thermodynamic functions of the compound, relative to that of the standard reference temperature 293.15 K, were calculated on the basis of the fitted polynomials and tabulated with an interval of 5 K. In addition, the possible mechanism of thermal decomposition of the compound was inferred by the result of TG-DTG analysis.</div>","PeriodicalId":9785,"journal":{"name":"Chemical Research in Chinese Universities","volume":"24 5","pages":"Pages 603-607"},"PeriodicalIF":3.1,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-9040(08)60127-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56328373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0