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Effect of Frontier Orbital on Aggregation Behavior of Barbituric Acid Derivatives

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Chemical Research in Chinese Universities 2002年第4期18卷 441-444页

作者： LIU Chun-ming yang wen-sheng Department of Chemistry Changchun Teachers’ColleageChangchun 130023P.R.China College of Chemistry Jilin UniversityChangchun 130023P.R.China

Two amphiphilic barbituric acid derivatives with a D-π-A structure, 5-(4-dodecyloxybenzylidene)-(1H,3H)-2,4,6-pyrimidinetrione(PB_ 12) and 5-(4-N,N-didodecylaminobenzylidene)-(1H,3H)-2,4,6-pyrimidintrione(AB_ 12) were found to show different aggregation behavior in chloroform. PB_ 12, a derivative with weak electron donating and strong electron drawing substituents, tends to aggregate in a head-to-tail manner, whereas AB_ 12, a derivative with both strong electron donating and drawing substituents, tends to aggregate in a face-to-face manner at a higher concentration. The cyclic voltammograms of AB_ 12 and PB_ 12 show that their energy levels of LUMO approach each other, however, the energy level of HOMO of AB_ 12 is much higher than that of PB_ 12.

关键词： Barbituric acid derivative Aggregation HOMO LUMO

Formation of Na_(1+x)V_3O_8 Nanoribbon Thin Film from V_2O_5 Xerogel on Sodium Silicate Glass Substrate

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Chemical Research in Chinese Universities 2007年第4期23卷 381-383页

作者： GUO Yi XU Jin-jie LI Jun yang wen-sheng College of Chemistry Jilin University Changchun 130012 P. R. China

Na1＋xV3O8 nanoribbon thin film was successfully fabricated by annealing the V2O5 xerogel film on sodium sili-cate glass substrate at 450℃. It has been identified that the amount of sodium ions diffused into the V2O5 xerogel film increases with the high temperature of annealing treatment. The sodium glass substrate serves as a limited sodium source to induce the transformation from V2O5 to Na1＋xV3O8.

关键词： Vanadium pentoxide Sodium silicate glass Nanoribbon Cathode materials

Oligo-lysine Induced Formation of Silica Particles in Neutral Silicate Solution

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Chemical Research in Chinese Universities 2006年第3期22卷 368-370页

作者： ZHANG Xiao-dong SUN Ying-ying ZHUANG Jia-qi yang wen-sheng College of Chemistry Jilin University Changchun 130023 P.R. China

Oligo-（lysine） n （n = 1-4） containing different numbers of lysine residues was used to induce the condensation of silicic acid to form silica particles in neutral silicate solution. It was found that the condensation rate and the formation of silica particles are dependent on the number of lysine residues in an oligo-lysine. Oligo-lysine with more lysine residues can link more silicic acid together to form a matrix that promotes the effective aggregation of the condensed silica pieces to form large silica particles.

关键词： Biosilification Polylysine Silica

Interactions of Cd Ions with Salmon Sperm DNA

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Chemical Research in Chinese Universities 2002年第4期18卷 430-432页

作者： CHEN Xia JIN Jian yang wen-sheng JIANG Lin XU Li LI Tie-jin College of Chemistry College of Life Science Jilin UniversityChangchun 130023P.R.China

The effect of Cd ions on salmon sperm DNA was studied by means of circular dichroism(CD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and fluorescence spectroscopy. The CD spectral and fluorescent probe-acriflavine results indicate that the DNA underwent a conformation change upon the addition of Cd ions. XPS and Raman studies reveal that there existed interactions between Cd ions and the phosphate groups of the DNA. In addition, a new band appeared at 803 cm -1in the Raman spectra, which can be attributed to characterizing 'marker' band of A-DNA. It is concluded that Cd ions can be coordinated by the phosphate groups of the DNA and induce the conformation changes of the DNA from B-DNA to A-DNA.

关键词： Cd ion DNA Raman spectroscopy Conformation.

Facile Preparation of Mn_2O_3 Nanowires by Thermal Decomposition of MnCO_3

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Chemical Research in Chinese Universities 2010年第1期26卷 5-7页

作者： WANG Hong-zhe ZHAO Hui-ling LIU Bing ZHANG Xing-tang DU Zu-liang yang wen-sheng Key Laboratory of Surface and Interface Chemistry of Jilin Province College of Chemistry Jilin University Changchun 130012 R R. China Key Laboratory for Special Functional Materials of Ministry of Education Henan University Kaifeng 475004 P. R. China

Mn2O3 nanowires with diameters of about 130 nm and lengths up to tens of micrometers were synthesized by the thermal decomposition of MnCO3 precursors. It was identified that the growth of the cubic Mn2O nanowires was preferential along the [001] direction. The intermediate stage containing melting state and the particles of manganese oxide played an important role for the formation of Mn2O3 with one-dimensional structure. X-ray diffraction, scanning electron microscopy, and transmission electron microscopy were used to characterize the morphology and crystal structure of the precursors and final products. Thermogravimetry analysis was also carried out to find the mechanism for the formation of Mn2O3 nanowires. The growth of the nanowires was proposed to be dominated by the conventional melt-growth mechanism.

关键词： Mn2O3 Nanowire Melt-growth mechanism

Growth of GeO_2 Crystallite Thin Film on Si Substrate by Langmuir-Blodgett Technique

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Chemical Research in Chinese Universities 2002年第4期18卷 478-480页

作者： JIN Jian GUO Yi CHEN Xia LI Ye-zhi yang wen-sheng LI Tie-jin College of Chemistry Jilin UniversityChangchun 130023P.R.China

A new simple method has been developed to prepare thin GeO_2 crystallitefilms on silica surface by combining the LB technique with the colloidal chemistry method. A kind ofamphiphilic oligomer was used to form reversed micelle in which Ge derivative was capped and whichwere used to deposit LB films. The thin GeO_2 crystallite film can be obtained by calcining the LBfilm at 500℃. It can be expected that this simple and controllable method without any expensiveequipment or technological difficulties can be employed to obtain other thin inorganic oxide filmson solid surfaces.

关键词： GeO2 crystallite film Langmuir-Blodgett technique Reversed micelle Oligomer

Synthesis of Pt/C Electrocatalysts Under Protection of Glucose and Their Improved Methanol Electrooxidation Activity

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Chemical Research in Chinese Universities 2012年第6期28卷 1074-1077页

作者： XING Zi-hao ZHAO Tian-meng JIANG Bo YIN Min SI Feng-zhan LIU Chang-peng yang wen-sheng College of Chemistry Jilin University Changchun 130012 P. R. China Laboratory of Advanced Power Sources Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. R. China

Carbon supported Pt（Pt/C） electrocatalysts were prepared with glucose as protection agent and NaBH 4 as *** Pt nanoparticles deposited on carbon support presented reduced size and well dispersity attributed to the protection effect of *** absorbed on the particle surface was readily removed by water washing without leading to agglomeration of the Pt *** as-prepared Pt/C electrocatalysts showed improved mass activity for methanol electrooxidation compared to the catalyst prepared without glucose *** improved performance is attributed to the larger electrochemical active surface area thus increased active sites on the Pt/C elctrocatalysts prepared under the protection of glucose.

关键词： Pt/C electrocatalyst Glucose Methanol electrooxidation Fuel cell

Cytotoxicity and DNA Damage Effect of TGA-capped CdTe Quantum Dots

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Chemical Research in Chinese Universities 2012年第2期28卷 276-281页

作者： LI Yan-bo ZHANG Hai-xia GUO Cai-xia HU Gui-qin DU Hai-ying JIN Ming-hua HUANG Pei-li SUN Zhi-wei yang wen-sheng School of Public Health and Family Medicine Capital Medical UniversityBeijing 100069P.R.China Public Health Institute Beijing Chaoyang District Centre for Disease Control and PreventionBeijing 100021P R.China School of Public Health Jilin UniversityChangchun 130021P.R.China Key Laboratory of Surface and Interface Chemistry of Jilin Province College of ChemistryJilin UniversityChangchun 130012P.R.China

The cytotoxicity and DNA damage caused by thioglycolic acid（TGA）-capped cadmium telluride（CdTe） quantum dots（QDs） to hepatocyte line HL-7702 were *** viability was measured by 3-（4,5-dimethylthiazol-2-yl）-2,5-diphenyltetrazolium bromide（MTT） assay;DNA damage was detected by single cell gel electrophoresis（SCGE）;the change of cell cycle progression was examined by propidium iodide（PI）-flow cytometry（FCM）;apoptosis was measured by acridine orange/ethidium bromide（AO/EB） assay and Annexin V-FITC/PI-FCM（FITC：fluorescein isothiocyanate）.The results show that the cytotoxicity induced by CdTe QDs was increased in a dose-dependent and time-dependent manner;after exposure to QDs for 24 h,as the exposure dose increased,the rate of DNA damage was significantly increased（P0.05）,and the degree of DNA damage was *** the dose of CdTe QDs increased,the percentage of G 0 /G 1 phase cells was significantly decreased（P0.001）,while the percenttages of S and G 2 /M phases cells were significantly increased（P0.001）.In AO/EB assay,apoptotic cells could be observed under a fluorescence microscope,and apoptotic rate was increased as exposure dose *** Annexin V-FITC/PI-FCM assay,the apoptotic rates of CdTe QDs treated groups were significantly increased compared with that of control group（P0.05）.Our studies indicate that CdTe QDs could influence cell viability,and induce DNA damage,the S and G2 /M phases arrest and apoptosis of HL-7702.

关键词： Apoptosis CdTe quantum dot(QD) Cell cycle Cell viability DNA damage

Mutual regulation between microRNA-373 and methyl-CpGbinding domain protein 2 in hilar cholangiocarcinoma

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World Journal of Gastroenterology 2012年第29期18卷 3849-3861页

作者： Yong-Jun Chen Jian Luo Guang-Yao yang Kang yang Song-Qi wen sheng-Quan Zou Department of Biliary-pancreatic Surgery Tongji Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan 430030 Hubei Province China

AIM:To investigate the reciprocal modulation between microRNA(miRNA) and DNA methylation via exploring the correlation between miR-373 and methyl-CpGbinding domain protein(MBD)***:MiR-373 expression was examined using the TaqMan miRNA *** of miR-373 was investigated using methylation-specific polymerase chain reaction,and recruitment of methyl binding proteins was studied using the chromatin immunoprecipitation *** analysis was conducted using the QuikChange Site-Directed Mutagenesis *** activity of miR-373 gene promoter constructs and targeting at MBD2-three prime untranslated region(3'UTR) by miR-373 were evaluated by a dual-luciferase reporter gene ***:In hilar cholangiocarcinoma,miR-373 decreased and was closely associated with poor cell differentiation,advanced clinical stage,and shorter *** promoter-associated CpG island of miR-373 gene was hypermethylated and inhibited expression of ***2 was up-regulated and enriched at the promoter-associated CpG island of ***-mediated suppression of miR-373 required MBD2 enrichment at the promoter-associated CpG island,and miR-373 negatively regulated MBD2 expression through targeting the 3'***:MiR-373 behaves as a direct transcriptional target and negative regulator of MBD2 activity through a feedback loop of CpG island methylation.

关键词： MicroRNA-373 Methyl-CpG binding domain proteins 2 Methylation Hilar cholangiocarcinoma Three prime untranslated region