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Enhanced visible-light photocatalytic activity of a g-C_3N_4/m-LaVO_4 heterojunction: band offset determination

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Science Bulletin 2016年第8期61卷 645-655页

作者： Xiaoping Liu Hao Qin weiliu Fan School of Chemistry and Chemical Engineering Shandong University State Key Laboratory of Crystal Materials Shandong University

Band offset is a dominant factor affecting the photocatalytic performance of heterostructure photocatalysts. Therefore, controlling the band gap structure of semiconductors is a key challenge in the development of efficient photocatalysts. We used a typical in situ-method to prepare diverse graphite-phase carbon nitride(g-C_3N_4)samples from melamine, thiourea, and a mixture thereof,and found that they exhibited band gaps between2.3–2.8 e V. From UV–Vis spectra and X-ray photoelectron spectroscopy measurements, we determined that the g-C_3N_4 samples exhibited different band gap values and valence band positions. On this basis, we constructed g-C_3N_4/m-La VO_4 heterojunctions with different band offsets. UV–Vis spectra and X-ray photoelectron spectroscopy measurements revealed that the valence band offsets(VBOs) of the different heterojunctions were similar, but their conduction band offsets(CBOs) were significantly different. Photocatalytic experiments revealed that the reaction rate was enhanced with an increase in the CBO value. Furthermore, the three-phase g-C_3N_4/g-C_3N_4/mLa VO_4 heterojunction composed of m-La VO_4 and mixed g-C_3N_4 showed the highest photocatalytic activity, which was mainly due to the construction of a multilevel structure. This work investigates the influence of the band offset on heterojunction photoelectrochemical properties and provides a new strategy to improve the photocatalytic activity by constructing multilevel structures.

关键词： Carbon nitride.Visible light photocatalysis ~PrecursorsBand offset. MultilevelHeterojunction

Electrochemical Studies on the Interactions of Dipyridophenazine Complex of Ruthenium and Herring Sperm DNA

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Chinese Chemical Letters 2005年第6期16卷 805-808页

作者： LiPingJIANG weiliu LingYahJIANG GuangHartLU CollegeofChemistry CentralChinaNormalUniversityWuhan430079

Cyclic voltammetry (CV) and single-step chronocoulometry were used to study the interaction of [Ru(phen)2dppz]2+ (phen=1,10-phenanthroline; dppz=dipyrido[3,2-a:2′,3′-c]phen- azine) with herring sperm DNA. The addition of DNA caused a diminution in the peak current and a positive shift in the peak potential of the complex of [Ru(phen)2dppz]2+. The 12 mV positive shift in the peak potential of [Ru(phen)2dppz]2+ indicates that [Ru(phen)2dppz]2+ binds 2.6 times more strongly to DNA than its reductive form. In addition, by using fluorimetric and UV-spectrophotometric methods and studies of denatured DNA and the effect of NaCl solution, it was also found that the binding mode was intercalation. The decrease of peak current is proportional to the concentration of DNA, which can be applied to estimate DNA concentration.

关键词： Ru complex electrochemistry DNA.

Lipopolysaccharide Could Be Internalized into Human Peripheral Blood Mononuclear Cells and Elicits TNF-α Release,but not via the Pathway of Toll-Like Receptor 4 on the Cell Surface

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Cellular & Molecular Immunology 2004年第5期1卷 373-377页

作者： HongZhou GuofuDing weiliu LiangxiWang YonglingLu HongweiCao JiangZheng DepartmentofPharmacology CollegeofMedicineThirdMilitaryMedicalUniversityChongqing400038China. MedicalResearchCenter SouthwesternHospitalThirdMilitaryMedicalUniversityChongqing400038China.

Lipopolysaccharide(LPS),the principal component of the outer membrane of Gram-negative bacteria,stimulates various cell types to release numerous proinflammatory mediators such as TNF-α,IL-6 and IL-12,which may damage cells and lead to organ injury,even sepsis and septic ***-like receptor 4(TLR4) has been identified as the receptor involved in the recognition of LPS,but the role of LPS uptake in activating signal transduction remains *** the present study,TNF-α was used as a marker of macrophages/ monocytes activated by LPS,and CQ was used as an inhibitor of endosome mature in order to definitude what stage of the signal transduction elicited by LPS was *** found that there indeed existed internalization of LPS and internalization partially participated in LPS signaling since CQ inhibited cytokine release,and decreased accumulation of FITC-LPS in *** contrast,anti-hTLR4 antibody could decrease cytokine release,but had no inhibition on accumulation of *** result revealed that inhibition of cytokine release was related to reduction of FITC-LPS accumulation in the *** TLR4 on the cell surface couldn't participate in internalization of ***,LPS signaling and internalization couldn't be viewed as mutually independent *** & Molecular Immunology.2004;1(5):373-377.

关键词： LPS TNF-α TLR4 internalization CQ

Determination of Surface pKa of Pure Mercaptoacetic Acid and 2-Mercaptobenzothiazole Mixed Monolayers by Impedance Titration

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Chinese Chemical Letters 2004年第7期15卷 827-830页

作者： GuangHanLU ChuanYinLIU HongYanZHAO weiliu LiPingJIANG LingYanJIANG Collegeofchemistry CentralChinaNormalUniversityWuhan430079 DepartmentofChemistry YunyangTeacher＇sCollegeDanjiangkouHubei442700

Interfacial proton transfer reactions of pure mercaptoacetic acid (MA) and 2-mercaptobenzothiazole (Mbz) mixed self-assembled monolayers (SAMs) have been studied using a.c. impedance titration method. The charge-transfer resistance (Rct,) is measured with the monolayer composition and the ionic strength of pH solution. The surface pKa can be obtained by the plots of Rct and pH, the reasons of shifts of surface pKa are also explained.

关键词： A.c.impedance titration mercaptoacetic acid 2-mercaptobenzothiazole self-assembled monolayers surface pKa.

Multiple gene differential expression patterns in human ischemic liver:Safe limit of warm ischemic time

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World Journal of Gastroenterology 2004年第14期10卷 2130-2133页

作者： Qi-PingLu Ting-]iaCao Zhi-YongZhang weiliu DepartmentofGeneralSurgery WuhanGeneralHospitalofGuangzhouMilitaryCommandWuhan430070HubeiProvinceChina

AIM: To investigate the multiple gene differential expression pattems in human ischemic liver and to produce the evidence about the hepatic ischemic safety ***: The responses of cells to hepatic ischemia and hypoxia at hepatic ischemia were analyzed by cDNA microarrary representing 4 000 different human genes containing 200 apoptotic correlative genes. RESULTS: There were lower or normal expression levels of apoptotic correlative genes during the periods of hepatic ischemia for 0-15 min, the maintenance homostatic genes were expressed significantly higher at the same time. But at the hepatic ischemia for 30 min, the expression levels of maintenance homeostatic genes were down-regulated, the expressions of many apoptotic correlative genes and nuclear transcription factors were activated and ***: HIF-1, APAF-1, PCDC10, FBX5, DFF-40, DFFA XIAP, survivin may be regarded as the signal genes to judge the degree of hepatic ischemic-hypoxic injure, and the apoptotic liver cell injury due to ischemia in different time limits. The safe limit of human hepatic warm ischemic time appears to be generally less then 30 min.

关键词：基因多样性基因表达表达模式局部缺血性肝脏缺血性疾病肝损害

The Stabilization Effect of Glutaraldehyde on the Spirulina platensis Phycobilisomes

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Chinese Chemical Letters 2004年第9期15卷 1083-1086页

作者： XiYingZHANG XiuLanCHEN weiliu YuZhongZHANG BaiChengZHOU StateKeyLaboratoryofMicrobialTechnology ShandongUniversityJinan250100 InstituteofOceanology ChineseAcademyofSciencesQingdao266071

The spectral properties of the glutaraldehyde-treated phycobilisomes were studied. The results showed that glutaraldehyde was effective in preventing phycobilisomes from dilution- induced dissociation and preserving ... 详细信息

关键词： Phycobilisomes Spirulina platensis energy transfer fluorescence glutaraldehyde.

Ability of luteinizing hormone releasing hormone-Pseudomonas aeruginosa exotoxin 40 binding to LHRH receptor on human liver cancer cells

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World Journal of Gastroenterology 2004年第19期10卷 2870-2873页

作者： Shou-LiangGong GangZhao Hong-GuangZhao Wen-TianLü Guang-weiliu PingZhu RadiobiologyResearchUnitofMinistryofPublicHealth SchoolofPublicHealthJilinUniversityChangchun130021JilinProvinceChina InstituteofMilitaryVeterinaryMedicine QuartermasterUniversityofChinesePLAChangchun130062.JilinPrnvinceChina

AIM: TO explore the ability of recombinant toxin luteinizinghormone releasing hormone-Pseudomonas aeruginosaexotoxin 40 (LHRH-PE40) and LHRH binding to LHRH receptor(LHRHR) on the membrane surface of human liver cancerHEPG ***: LHRH was labeled by using 12sI with enzymaticreaction. The affinity and receptor volume of LHP, H-PE40and LHRH binding to LHRHR on the membrane surface ofhuman liver cancer cells were measured with radioligandreceptor ***: The specific activity of LHRH labeled with 12sIwas 2.7x 104 kBq/l^L, and its radiochemical purity reachedto 99.2-99.7%. The binding of 12sI to LHRH was maximalfor 240 min in the warm cultivation, and this binding wasstabilized. The inhibiting rates of ~2SI-LHRH and LHRH onthe proliferation of human liver cancer HEPG cells werenot significantly different. On the basis of the saturationcurve of ~2SI-LHRH binding to the membrane LHRHR of HEPGcells, ~2SI-LHRH of lx10s cpm was selected for radioligandreceptor assay. The affinity constants (Kd) of LHRH-PE40and LHRH binding to the membrane LHRHR of HEPG cellswere 0.43~0.12 nmol/L and 4.86~ 1.47 nmol/L, respectively,and their receptor volumes were 0.37~0.15 l^mol/g and0.42=I=0.13 l^mol/g, respectively. The binding of LHRH-PE40to the membrane protein of normal liver cells was ***: The recombinant toxin LHRH-PE40 binding tothe membrane surface of LHRHR of human liver cancer HEPGcells was very strong, while the specific binding of it to normalliver cells was not observed. The results provide an importantexperimental basis for the clinical application of LHRH-PE.

关键词：黄体激素激素释放荷尔蒙-假单胞激素铜绿色外毒素40 LHRH 粘合物受体肝细胞癌肿瘤

Screening difFerentially expressed genes in mouse hepatocarcinoma ascites cell line with high potential of lymphatic metastasis

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World Journal of Gastroenterology 2005年第12期11卷 1837-1842页

作者： Xiao-NanCui Jian-WuTang LiHOU BoSong LiLi Ji-weiliu DepartmentofOncology the1stAffilitateHospitalofDalianMedicalUniversityDalian116011LiaoningProvinceChina DepartmentofPathology DalianMedicalUniversityDalian116027LiaoningProvinceChina

AIM: To screen genes differentially expressed in mouse hepatocarcinoma ascites cell line with high potential of lymphatic ***: A subtracted cDNA library of mouse hepatocarcinoma cell line with high potential of lymphatic metastatic Hca-F and its synogenetic cell line Hca-P with a low metastatic potential was constructed by suppression subtracted hybridization(SSH) method. The screened clones of the subtracted library were sequenced and GeneBank homology search was ***: Fourteen differentially expressed cDNA fragments of Hca-F were obtained with two novel ***: SSH is a useful technique to detect differentially expressioned genes and an effective method to clone novel genes.

关键词： Suppression subtracted hybridization Liver neoplasm Lymphogenous metastasis

Symptom-based tendencies of Helicobacter pylori eradication in patients with functional dyspepsia

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World Journal of Gastroenterology 2011年第27期17卷 3242-3247页

作者： LingLan ]ingYu Yu—LongChen Ya—LiZhong HaoZhang Chang HeJia YuanYuan Bo—weiliu Department of Gastroenterology the People’S Hospital of Henan ProvinceZhengzhou 450003Henan ProvinceChina Department of Gastroenterology the Fist Affiliated HospitalZhengzhou UniversityZhengzhou 450052Henan ProvinceChina Department of Gastroenterology the Second Affiliated HospitalZhengzhou UniversityZhengzhou 450014Henan ProvinceChina

AIM: To investigate whether there were symptom-based tendencies in the Helicobacter pylori (H. pylori) eradication in functional dyspepsia (FD) patients. METHODS: A randomized, single-blind, placebo-controlled study of H. pylori eradication for FD was conduct- ed. A total of 195 FD patients with H. pylori infection were divided into two groups: 98 patients in the treatment group were treated with rabeprazole 10 mg twice daily for 2 wk, amoxicillin 1.0 g and clarithromycin 0.5 g twice daily for 1 wk; 97 patients in the placebo group were given placebos as control. Symptoms of FD, such as postprandial fullness, early satiety, nausea, belching,epigastric pain and epigastric burning, were assessed 3 mo after H. pylori eradication. RESULTS: By per-protocol analysis in patients with successful H. pylori eradication, higher effective rates of 77.2% and 82% were achieved in the patients with epigastric pain and epigastric burning than those in the placebo group (P 0.05). In 84 patients who received H. pylori eradication therapy, the effective rates for epigastric pain (73.8%) and epigastric burning (80.7%) were higher than those in the placebo group (P 0.05). By intention-to-treat analysis, patients with epigastric pain and epigastric burning in the treatment group achieved higher effective rates of 60.8% and 65.7% than the placebo group (33.3% and 31.8%) (P < 0.05). The effective rates for postprandial fullness, early satiety, nausea and belching were 34.8%, 27.9%, 41.1% and 26.7% respectively in the treatment group, with no significant differen

关键词： Helicobacter pylori Functional dyspepsia Eradication Symptom