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Root Exudates, Rhizosphere Zn Fractions, and Zn Accumulation of Ryegrass at Different Soil Zn Levels

Pedosphere 2007年第3期17卷 389-396页

作者： XU Wei-Hong LIU Huai MA Qi-Fu XIONG Zhi-Ting college of Resources and Environmental sciences Southwest University Chongqing 400716 （China） college of Plant Protection Southwest University Chongqing 400716 （China） Soil science and Plant Nutrition University of Western Australia Crawley WA 600Y （ Australia） college of Resources and Environmental sciences Wuhan University Wuhan 430072 （China）

A glasshouse experiment was conducted using a root-bag technique to study the root exudates, rhizosphere Zn fractions, and Zn concentrations and accumulations of two ryegrass cultivars （Lolium perenne L. cvs. Airs and Tede） at different soil Zn levels （0, 2, 4, 8, and 16 mmol kg^-1 soil）. Results indicated that plant growth of the two cultivars was not advérsely affected at soil Zn level ≤ 8 mmol kg^-1. Plants accumulated more Zn as soil Zn levels increased, and Zn concentrations of shoots were about 540 μg g^-1 in Aris and 583.9 μg g^-1 in Tede in response to 16 mmol Zn kg^-1 soil. Zn ratios of shoots to roots across the soil Zn levels were higher in Tede than in Airs, corresponding with higher rhizosphere available Zn fractions （exchangeable, bound to manganese oxides, and bound to organic matter） in Airs than in Tede. Low-molecular-weight （LMW） organic acids （oxalic, tartaric, malic, and succinic acids） and amino acids （proline, threonine, glutamic acid, and aspartic acid, etc.） were detected in root exudates, and the concentrations of LMW organic acids and amino acids increased with addition of 4 mmol Zn kg^-1 soil compared with zero Zn addition. Higher rhizosphere concentrations of oxalic acid, glutamic acid, alanine, phenylalanine, leucine, and proline in Tede than in Airs likely resulted in increased Zn uptake from the soil by Tede than by Airs. The results suggested that genotypic differences in Zn accumulations were mainly because of different root exudates and rhizosphere Zn fractions.

关键词： plant Zn accumulation rhizosphere Zn fractions root exudates ryegrass soil Zn level

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Antiviral compounds and one new iridoid glycoside from Cornus officinalis

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Progress in Natural science:Materials International 2006年第2期16卷 142-146页

作者： WANG Yue, LI Zhengquan, CHEN Lirong and XU Xiaojie (college of chemistry and molecular Engineering, Peking university, Beijing 100871, china) [a]college of chemistry and molecular Engineering Piking University Beijing China

From Cornus officinalis Sieb. et Zucc., bioassay-guided fractionation led to the isolation of four active tannin compounds with high effectiveness of inhibiting Hepatitis C virus NS3 serine protease in vitro. The compounds are: 1,2,3, 6-tetragalloyl-β-D-glucopyranose (1), 1,2,3,4,6- pentagalloyl-β-D-glucopyranose (2), Tellimagrandin I (3) and Tellimagrandin II(4). The four compounds could inhibit HCV NS3 protease in vitro with IC50 values of 6.98, 5.11, 7.0 and 4.8μmol/L respectively. In addition, a new iridoid glycoside (5) was also isolated from Cornus officinalis Sieb. et Zucc., which was assigned to be 7-O-butyl morroniside by spec-troscopic analysis.

关键词： inhibitor HCV NS3 protease iridoid glycoside Cornus officinalis Sieb. et Zucc.

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SYNTHESIS OF β-SUBSTITUTED CATIONIC PORPHYRINS AND THEIR INTERACTIONS WITH DNA

SYNTHESIS OF β-SUBSTITUTED CATIONIC PORPHYRINS AND THEIR IN...

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40th IUPAC Congress

作者： Bo Chen Feng Liang Xiang Zhou* college of chemistry and molecular sciences wuhan university Hubei wuhan 430072 china

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Resolution of α-cyclohexyl-mandelic acid enantiomers by two-phase (O/W) recognition chiral extraction

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science china chemistry 2007年第6期50卷 764-769页

作者： TANG KeWen1,2, ZHANG GuoLi2, HUANG KeLong2, LI Yuanjian3 & YI JianMin1,2 1 Department of chemistry and Chemical Engineering, Hunan Institute of science and Technology, Yueyang 414000, china 2 college of chemistry and Chemical Engineering, Central South university, Changsha 410083, china 3 college of Pharmaceutical science, Central South university, Changsha 410078, china Department of chemistry and Chemical Engineering Hunan Institute of Science and TechnologyYueyang 414000China college of chemistry and Chemical Engineering Central South UniversityChangsha 410083China

This paper presents a new chiral separation technology:two-phase(O/W)recognition chiral *** behavior of alpha-cyclohexyl-mandelic acid enantiomers was studied in the extraction system with D(L)-isobutyl tartrate in 1,2-dichloroethane organic phase and beta-CD derivatives in aqueous phase,and the influence of the kind and concentration of extractant and pH on extraction performance was *** experimental results indicate that two-phase(O/W)recognition chiral extraction is of strong chiral separation ***-^-CD,HE-beta-CD and Me-beta-CD have higher recognition ability for S-CHMA than that for R-CHMA,among which HP-beta-CD has the strongest ability;whereas,D-isobutyl tartrate has reversed recognition ability for *** the extraction system containing HP-beta-CD and D-isobutyl tartrate,e.e.% of S-CHMA in aqueous phase reached 27.6% by one stage extraction,and the distribution ratio for R-CHMA(k_R)and for S-CHMA(k_S)and separation factor(alpha)are 2.44,0.89 and 2.49,***,pH and concentration of extractant have great effects on chiral separation ***-phase(O/W)recognition chiral extraction has great significance for preparative separation of racemic compounds.

关键词： two-phase(W/0)recognition chiral extraction alpha-cyclohexyl-mandelic acid enantiomers

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Synthesis and Phase Behavior of ω-(cholesteroxycarbonyloxy)-alkyl 3,3,5,5-tetramethyl-3,5-disila-4-oxa cyclohexyl-carboxylate

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wuhan university Journal of Natural sciences 2000年第2期5卷 233-237页

作者： Tang Hong-Ding Xiong Ying Zhang Xian-Liang wuhan university College of Chemistry and Environmental Science China (GRID:grid.49470.3e) (ISNI:***)

Four new organosilane compounds containing cholesteryl group were synthesized by esterification of 3,3,5,5-tetramethyl-3,5-disila-4-oxa-cyclohexane-1-carboxylic acid and ω-hydroxyalkyl, cholesteryl carbonate in the presence of DCC and DMAP. Their structures were characterized by1H-NMR, IR and elemental analysis. Their phase behaviors were investigated by differential scanning calorimetry (DSC) and polarized microscopy. Results showed that these four organosilane compounds were all liquid crystalline and longer spacer was advantageous to orientation of organosilane heterocycle and cholesteryl group.

关键词： organosilane heterocycle liquid crystal synthesis phase behavior

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NMR Study of Hydroxyl-Substituted Macrocyclic Hexaamine in Solution

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wuhan university Journal of Natural sciences 2003年第1A期8卷 105-106页

作者： Liang Feng, Wu Xiao \|jun, Wu Cheng\|tai  college of chemistry and molecular sciences, wuhan university , wuhan 430072, Hubei, china wuhan university College of Chemistry and Molecular Sciences Wuhan Hubei China (GRID:grid.49470.3e) (ISNI:***)

The NMR methods (including 1H NMR, vari\| able temperature method and the 2D COSY technique) were employed to study the conformation of 3,13\|dihydroxyl\|1,5,8,11,15,18\|hexaazac yclicami... 详细信息

关键词： macrocyclic polyamines NMR conformation

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Studies on the Nucleophilicity and Scavenge of Superoxide Ion by Cyclic Voltammetry

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wuhan university Journal of Natural sciences 2003年第3A期8卷 866-870页

作者： Wei Ying\|liang, Dang Xue\|ping, Hu Sheng\|shui  college of chemistry and molecular sciences, wuhan university , wuhan, 430072, china college of chemistry and molecular sciences Wuhan University Wuhan 430072 China

Superoxide ion was generated by the electrochemical reduction of oxygen at a platinum electrode in dimethylsulphoxide (DMSO). This work was focused on the nucleophilicity and scavenge of electrogenerated\|superoxide ion by cyclic voltammetry. The nucleophilic displacement reactions of superoxide ion with ethyl acetate and diethyl adipate were discussed and the reason for remarkable influence of diethyl adipate was elucidated. The scavenging activity of ascorbic acid was evaluated and the result allowed the conclusion that the scavenging ability of ascorbic acid is much lower in DMSO than in aqueous phase. UV\|spectrum of electrogenerated superoxide ion in DMSO exhibited a single absorption band with λ max at 275 nm, which certified further that the method of electrogeneration was reliable and superoxide ion was stable in DMSO.

关键词： superoxide ion dimethylsulphoxide cyclic voltammetry ascorbic acid

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Resonance Light-Scattering Spectroscopy Study on Interaction between Gold Colloid and Thiol Containing Pharmaceutical

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wuhan university Journal of Natural sciences 2003年第1A期8卷 99-100页

作者： Liu Xiao\|ling, Cai Ru\|xiu , Yuan Hong college of chemistry and molecular sciences, wuhan university , wuhan 430072, Hubei, china wuhan university College of Chemistry and Molecular Sciences Wuhan Hubei China (GRID:grid.49470.3e) (ISNI:***)

In this paper, we used resonance light\|scatter i ng (RLS) spectroscopy to study the interaction between thiol\|containing pharmac eutical and gold colloid. And for the first time, we proposed that this highly s ensitive, gold colloid\|based assay using RLS technique may have potential appli cation in detecting thiol\|containing substances.

关键词： thiol\|containing pharmaceutical gold nanopart icle resonance light\|scattering

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Hemoglobin-biocatalyzed Synthesis of Conducting molecular Complex of Polyaniline and Lignosulfonate

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Journal of wuhan university of Technology(Materials science) 2008年第6期23卷 809-815页

作者：胡兴邹国林 Department of Bioengineering Huaihua University State Key Laboratory of Virology College of Life SciencesWuhan University

A new biocatalyst route for the synthesis of a conducting polyaniline （PANI）/ lignosulfonate （LGS） complex was *** different catalysts such as hemoglobin （Hb）,5,10,15,20-tetrakis （meso-hydroxyphenyl） porphyrin,iron （II） tetrasulfophthalocyanine and ferric chloride were used to polymerize aniline in the presence of a natural polyelectrolytes template *** experimental results show that Hb is an effective catalyst in this case and the synthesis is simple,and the conditions are mild in that the polymerization may be carried out in lower pH （1.0-4.0） buffered solution and optimal pH of *** concentrations of aniline,LGS and H2O2 in feed the favorable conditions for the production of PANI were ***-vis absorption,FTIR,elemental analysis,conductivity,cyclic voltammetry and thermogravimetric analyses confirm the formation of thermally stable and electroactive PANI.

关键词： hemoglobin polyaniline biocatalyst conductivity lignosulfonate

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Improved electrochemical performances of polyaniline nanotubes-poly-L-lysine composite for label-free impedance detection of DNA hybridization

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science china chemistry 2010年第6期53卷 1371-1377页

作者： YANG Tao,JIANG Chen,ZHANG Wei & JIAO Kui Key Laboratory of Eco-chemical Engineering,Ministry of Education college of chemistry and molecular Engineering,Qingdao university of science and Technology,Qingdao 266042,china 1. Key Laboratory of Eco-chemical Engineering Ministry of Education college of chemistry and molecular Engineering Qingdao University of Science and Technology Qingdao 266042 China

A sensitive label-free DNA hybridization biosensing platform was fabricated based on the synergistic effect of polyaniline nanotubes (PANInt) and poly-L-lysine (pLys).The composite of pLys and PANInt was coated onto the carbon paste electrode (CPE) to form a uniform and very stable nanocomposite *** pLys in the composite film not only acts as a membrane to retain good electron transfer capability of PANInt even at physiological pH,but also possesses fine biocompatibility for *** probes with negatively charged phosphate groups were readily linked to the positively charged pLys surface due to the strong electrostatic *** synergistic effect of PANInt and pLys could significantly enhance the sensitivity of DNA hybridization *** phosphinothricin acetyltransferase (PAT) gene fragment from transgenic corn and the polymerase chain reaction amplification of the terminator of nopaline synthase gene from the real sample of a kind of transgenic soybean were detected by this DNA electrochemical biosensor via label-free impedance *** stable composite gives convenient permselectivity properties as a transducer material for the design of modern electrochemical impedance biosensor using [Fe(CN)6]3-/4as an indicator.

关键词： poly-L-lysine polyaniline nanotubes DNA electrochemical biosensor PAT gene NOS gene

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