中国化学快报

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An Efficient Deselenenylation Reaction to the Synthesis of 3,5-Disubstituted Isoxazoline and Isoxazole

Wei Ming XU, Yu Guang WANG, Zhen Hua CHEN, Xian HUANG

中国化学快报. 2005, 16(08): 995-996.

摘要 ( )

可视化

A mild deselenenylation reaction protocol for the preparation of 3, 5-disubstituted isoxazolines and their further application to 3-methyl-5-substituted isoxazoles both in solution phase and solid phase was reported.

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Structure-activity Relationship of Sintenin and its Analogues on Six Human Tumor Cell Lines

Li Hong HU, Hong Bin ZOU, Jing Xu GONG, Hai Bo LI, Lei Xiang YANG, Chang Xin ZHOU, Hua BAI, Xiu Mei WU, Wei CHENG, Yu ZHAO

中国化学快报. 2005, 16(08): 997-1000.

摘要 ( )

可视化

The synthesis of a cytotoxic natural ester sintenin 1 and thirty-three of its analogues 2-34 were carried out. The cytotoxicities of the synthetic compounds have been screened for human tumor cell lines such as PC-3, Hela, A549, BEL7404, CNE, and KB. The results showed that phenolic derivatives exhibited strongest cytoxicity, and the unsaturated esters were more cytotoxic than their saturated analogues.

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Reaction of Polymer-supported Selenovinyl Bromide with Grignard Reagents:A Facile Route to the Synthesis of (E)-1,2-Disubstituted Olefins

E TANG, Xiang Jin LIN, Lu Ling WU

中国化学快报. 2005, 16(08): 1001-1003.

摘要 ( )

可视化

Polymer-supported selenovinyl bromide, easily prepared from polymer-supported selenenyl bromide with acetylene, reacts with different Grignard reagents using a step-by-step strategy to obtain (E)-1, 2-disubstituted ethenes in good yields.

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Synthesis Hexadecyl 3-{4-[2-Hydroxy-3(isopropylamino) propoxy]phenyl}propionate as Potential Ligand for Liposome Targeting to Ischemic Myocardium

Yan Li HAO, Ying Jie DENG, Yan CHEN, You Cai HU

中国化学快报. 2005, 16(08): 1004-1006.

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可视化

Novel hexadecyl 3-{4-[2-hydroxy-3(isopropylamino)propoxy]phenyl} propionate (HPP)was synthesized and its effect on delivery of liposomes into cultured cardiomyocytes was examined. The structure of HPP was characterized by ¹H NMR, IR and MS. The amount of cardiomyocytes uptake of HPP-liposome was 3.9-fold higher than plain-liposome, and the increase was 6.2-fold when hypoxia happens. It indicated that HPP was a potential ligand for liposome targeting to ischemic myocardium.

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[Bmim]Br₃ as a New Reagent for Regioselective Mono-bromination of Activated Aromatics under Solvent-free Conditions

Zhang Gao LE, Zhen Chu CHEN, Yi HU, Qin Guo ZHENG

中国化学快报. 2005, 16(08): 1007-1009.

摘要 ( )

可视化

Reaction of activated aromatics containing phenols, naphthol, methoxynaphthalenes,anisole etc. with 1-butyl-3-methylimidazolium tribromide ([Bmim]Br₃) under solvent-free conditions, selectively gave the corresponding monobromination products with excellent yields.

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Structure and Transesterification Reaction of Methyl 3-(Phenyldihalostannyl) propionates

Lai Jin TIAN, Qing Sen YU, Li Ping ZHANG, Yu Xi SUN

中国化学快报. 2005, 16(08): 1010-1012.

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可视化

The title compounds, PhX₂SnCH₂CH₂CO₂Me (X=Cl, 1a; Br, 1b; I, 1c), readily underwent transesterification into the corresponding analogues, PhX₂SnCH₂CH₂CO₂R when reacted with an alcohol ROH. The structural features of these compounds were described, and the possible mechanism of the novel transesterification was suggested.

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Site-directed Chemical Modification of Recombinant Human aFGF Mutant with Polyethylene Glycol

Qing ZHENG, Zhi Feng HUANG, Xiao Ping WU, Zhi Jian SU, Hua XU, Wen ZHAO, Ya Dong HUANG, Xiao Kun LI

中国化学快报. 2005, 16(08): 1013-1016.

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可视化

A new product PEGylated rhaFGF was obtained by site-directed chemical modification.When compared with unmodified rhaFGF, PEGylated rhaFGF showed comparable bioactivity and superior stability at 37℃ in mouse serum and the stronger resistant potency to trypsin. This was accompanied by a substantial decreasing immunogenicity. Site-specific PEGylation of rhaFGF may increase its therapeutic potency in humans.

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Phase Selectively Soluble Dendritic Derivative of 4-(Dimethylamino)-pyridine:An Easily Recyclable Catalyst for Baylis-Hillman Reactions

Hang GONG, Nian Fa YANG, Wei Jun TANG, Qing Hua FAN, Li Wen YANG

中国化学快报. 2005, 16(08): 1017-1020.

摘要 ( )

可视化

A new thermomorphic catalytic system for the Baylis-Hillman coupling of aromatic aldehydes with α, β-unsaturated ketone has been described, in which the alkyl-functionalized dendritic catalyst preferred to dissolve in non-polar organic layer in the thermomorphic biphasic system, leading to easy separation of the catalyst from the polar products by changing the temperature of the system at end of the reaction.

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Synthesis of Amphiphilic Hepatocyte Targeting Cholesterylated Thiogalactosides

Li HAI, Xun SUN, Zhi Rong ZHANG, Yu LUO, Yong WU

中国化学快报. 2005, 16(08): 1021-1023.

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可视化

Six amphiphilic cholesterylated thiogalactosides 1a-f with high affinity for the asialoglycoprotein receptor have been synthesized by coupling 2,3,4,6-tetra-O-acetyl-1-thio-β-Dgalactopyranose 8 with prepared cholesterol derivatives 7a-f, then by deacetylating. Preliminary results show liposomes containing those galactosides derivatives exhibited higher affinity and transfection activity in hepatoma cells HepG2 and SMMC-7721.

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The First Total Synthesis of Triprenylquinone and Hydroquinones

Chun Hong LI, Xue Song CHEN, Guang Lian ZHOU, Zhi Xiang XIE, Ying LI

中国化学快报. 2005, 16(08): 1024-1026.

摘要 ( )

可视化

First total synthesis of triprenylquinone and hydroquinones, three naturally occurring compound 1, 2 and (±) 3, have been achieved from readily available 2-bromo-5-methyl-1,4-dimethoxybenzene 4 and geranyl bromide. The triprenylquinone and hydroquinones precursor were readily prepared with use of a Julia reaction.

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Microwave-prompted Rapid and Efficient Synthesis of Diacyl Thiosemicarbazides and Semicarbazides in Solvent and Catalyst Free Condition

Xi Cun WANG, Zheng Jun QUAN, Man Gang WANG, Zheng LI

中国化学快报. 2005, 16(08): 1027-1030.

摘要 ( )

可视化

Eighteen 1-aroyl-4-(2-iodobenzoyl) thiosemicarbazides and corresponding semicarbazides were synthesized in excellent yield under microwave irradiation in solvent and catalyst free condition.

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Preparation of Novel Side-chain Pseudopolyrotaxanes Consisting of Cucurbituril[6]and Polyamine Salts

Zhao Sheng HOU, Ye Bang TAN, Kimoon KIM, Qi Feng ZHOU

中国化学快报. 2005, 16(08): 1031-1034.

摘要 ( )

可视化

Pseudorotaxane monomer (VBCB) containing cucurbitutil[6] (CB[6]) and N¹-(4-vinylbenzyl)-1,4-diaminobutane dihydrochloride (VBDADC) is obtained by self-assembly of cucurbituril[6] with VBDADC in water and then polymerized using potassium persulfate (KPS) as initiator to give novel water-soluble side-chain cucurbituril[6]-based pseudopolyrotaxane (PVBCB). The chemical structures of PVBCB, VBCB and VBDADC are confirmed by ¹H NMR,¹³C NMR spectra and elemental analysis. In VBCB, CB[6] is localized aliphatic group of the side chain and the molar ratio of CB[6] to VBDAC is 1:1.

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Synthesis of the Biomimetic Polymer:Aliphatic Diamine and RGDS Modified Poly (d,l-lactic acid)

Xu Feng NIU, Yuan Liang WANG, Yan Feng LUO, Jun PAN, Juan Fang SHANG, Li Xia GUO

中国化学快报. 2005, 16(08): 1035-1038.

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可视化

A novel poly(d,l-lactic acid) (PDLLA) based biomimetic polymer was synthesized by grafting maleic anhydride, butanediamine and arg-gly-asp-ser (RGDS) peptides onto the backbone of PDLLA, aiming to overcome the acidity and auto-accelerating degradation of PDLLA during degradation and to improve its biospecificity and biocompatibility. The synthetic copolymer was characterized by FTIR, ¹³C NMR and amino acid analyzer (AAA).

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Improved One-pot Synthesis of 4,6-Dihydroxyisophthalic Acid and 2,3-Dihydroxyterephthalic Acid

Guang Dong LEI, Li Xin LI, Zhi Yun LU, Ming Gui XIE

中国化学快报. 2005, 16(08): 1039-1042.

摘要 ( )

可视化

An improved method for the large-scale preparation of 4,6-dihydroxyisophthalic acid and 2,3-dihydroxyterephthalic acid has been developed. Compared to the previous procedures,this new process requires much lower CO₂ pressure of 0.3 Mpa and shorter reaction time, thus providing a convenient access for large-scale synthesis. The yield is high (93% and 65%,respectively), and the oxidation of phenol is nearly inhibited, neither decolorization nor further chromatographic purification is required.

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Two New Norditerpenoid Alkaloids of Aconitum nagarum

Fan ZHANG, Shu Lin PENG, Fan LUO, Li Sheng DING

中国化学快报. 2005, 16(08): 1043-1046.

摘要 ( )

可视化

Two new norditerpenoid alkaloids were isolated from the roots of Aconitum nagarum.Their structures were elucidated as 13-hydroxyfranchetine 1 and 10-dehydroxyflavaconitine 2,respectively, by 1D and 2D NMR experiments.

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A New Cycloartane Triterpene Glycoside from Souliea vaginata

Liang ZHOU, Jun Shan YANG, Guang Zhong TU

中国化学快报. 2005, 16(08): 1047-1049.

摘要 ( )

可视化

A new cycloartane triterpene glycoside was isolated from the rhizome of Souliea vaginata. Its structure was established as 12-deacetyloxy-15α-hydroxy-23-epi-26-deoxyactein by spectroscopic and chemical methods.

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Three New Anthraquinones from Polygonum cillinerve

Huan Yang QI, Chao Feng ZHANG, Mian ZHANG, Jian Qun LIU, Zheng Tao WANG

中国化学快报. 2005, 16(08): 1050-1052.

摘要 ( )

可视化

ree new anthraquinones, emodin-8-β-D-(2"-O-coumarate)glucoside 1, emodin-8-β-D-(6'-O-acetyl)glucoside 2 and physicon-8-β-D-(6'-O-acetyl)glucoside 3, were isolated from the roots of Polygonum cillinerve and their structures were established by spectroscopic methods. The biological activity indicated that compound 1 had the scavenging activity on 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals (the IC₅₀=8.5 μmol/L), and compound 1-3 showed no activities against HL-60 and BGC-823 cells by MTT method in vitro.

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Two New Eremophilenolides from Ligularia tongolensis

Yi Feng HAN, Dong Qing FEI, Kun GAO, Zhong Jian JIA

中国化学快报. 2005, 16(08): 1053-1055.

摘要 ( )

可视化

Chemical investigation of L. tongolensis afforded two new eremophilenolides, which were identified as 3β-(2'-methylbutanoyloxy)-8βH-eremophil-7(11)-en-12, 8α (14, 6α)-diolide (1)and 8βH-eremophil-3, 7(11)-dien-12, 8α (14, 6α)-diolide (2). Their structures were established by spectroscopic methods including 2D NMR experiments.

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A New Flavan from Sinacalia tangutica

Man Jun MAO, Jun Lü QIAN, Biao JIANG

中国化学快报. 2005, 16(08): 1056-1058.

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可视化

A new flavan named 4α, 5-dimethoxy-8-formyl-7-hydroxy-6-methylflavan (1) was isolated from Sinacalia tangutica. Its structure was determined using spectroscopic methods and X-ray diffraction experiments.

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Preparation of Functional Magnetic Nanoparticles and its Application in Diagnostic Analysis

Qiong CHENG, Tu Zhi PENG, Ai Li LIU

中国化学快报. 2005, 16(08): 1059-1062.

摘要 ( )

可视化

The magnetic nanoparticles modified with carboxyl functional group were synthesized and characterized. These nanoparticles covalently bound with hepatitis B surface antibody (HBsAb), were used to detect hepatitis B surface antigen (HBsAg) in immunovoltammetry. The detection limit was found to be 0.06 ng/mL, which is much higher than that of enzyme-linked immunosorbent assay (ELISA) used in clinical analysis.

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Resonance Light Scattering Spectra of Silver Thiocyanate System and its Application in Analysis

Chang Yin LU, Zhi Hui H AN, Sheng Yuan YANG

中国化学快报. 2005, 16(08): 1063-1066.

摘要 ( )

可视化

A novel determination method of Ag⁺ was established. In acetic acid-sodium acetate buffer (pH 5.0) medium, Ag⁺ reacts with SCN^- to form AgSCN in the presence of TritonX-100,which results in an increase of resonance light scattering (RLS) and giving a new RLS spectrum.The maximum RLS peak was at 585 nm. The enhancement of resonance light scattering at 585nm was proportional to the concentration of Ag⁺ranging from 0.0045-4.00 μg mL^-1 (r=0.9991),and the detection limit was 1.37 ng mL^-1 with the recovery of 97.70%~104.80%.

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Indirect Flow Injection Chemiluminescence Method for the Determination of Tetracyclines Using Cu (Ⅱ) as a Probe Ion

Su Qin HAN, Er Bao LIU, Hua LI

中国化学快报. 2005, 16(08): 1067-1070.

摘要 ( )

可视化

This paper reported an indirect flow injection chemiluminescence (FI-CL) method for the determination of the drugs tetracycline (TC), chlortetracycline (CTC) and oxytetracycline (OTC) using Cu(Ⅱ) as a probe ion. The CL reaction was induced on-line and after injection of the sample the negative peaks appeared as a result of complexation. The method was applied to the determination of TCs in pharmaceuticals and human urine with recoveries in the range 95~105%.

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Preparation and Sensitivity of SnO₂ Grafted MCM-41 Sensor

Guo Hua GAO, Sibudjing KAWI, Ming Yuan HE

中国化学快报. 2005, 16(08): 1071-1073.

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可视化

SnO₂ grafted MCM-41 sensor was prepared by MOCVD in the pore of MCM-41. The sensor has high sensitivity for carbon monoxide at low temperature compared with commercially available low-surface-area tin dioxide.

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Ionic Liquid-salt Aqueous Two-phase System,a Novel System for the Extraction of Abused Drugs

She Hong LI, Chi Yang HE, Hu Wei LIU, Ke An LI, Feng LIU

中国化学快报. 2005, 16(08): 1074-1076.

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可视化

A 1-butyl-3-methylimidazolium chloride-salt aqueous two-phase system was studied on extraction of abused drugs. The effects of sorts of salts, temperature, concentration of salt and drugs on system were investigated systematically. A satisfactory extraction efficiency of 93%was obtained for papaverine while that of morphine was 65%. The extraction mechanism was primarily discussed.

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Capacity Titration Technique for Determining the Solid Diffusion Coefficient of Intercalary Species within Insertion-host Materials

Xin Cun TANG, Tian Duo LI

中国化学快报. 2005, 16(08): 1077-1080.

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可视化

In this paper, the capacity titration technique (CT technique) was developed on basis of the RPG (ratio of potentio-charge capacity to galvano-charge capacity) method to continuously determine the solid diffusion coefficient D of the intercalary species within insertion-host materials with a small voltage region. The linear equations of D vs. q (value of ratio of the potentio-charge capacity to the galvano-charge capacity) were given in different range of q. By the CT technique,the Li⁺ solid diffusion coefficients D within LiMn₂O₄ at different voltages were determined. The results showed that the values of D varied from 3.447×10^-9 cm²/s to 7.60×10^-11cm²/s in the voltage range of charge from 3.3V to 4.3V as a function of voltage with "W" shape.

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A Novel Cholesterol Oxidase Biosensor Based on Pt-nanoparticle/Carbon Nanotube Modified Electrode

Qiao Cui SHI, Tu Zhi PENG

中国化学快报. 2005, 16(08): 1081-1084.

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可视化

A Pt-nanoparticle/carbon nanotube modified graphite electrode immobilized with cholesterol oxidase/sol-gel layer was developed for monitoring cholesterol. Using this electrode,cholesterol concentration (4.0×10^-6 to 1.0×10^-4 mol/L) could be determined accurately in the presence of ascorbic or uric acid, and the response time was rapid (<20 s). This biosensor has high sensitivity and selectivity.

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Preparation of Chitosan-coated Nylon Membranes and their Application as Affinity Membranes

Wei SHI, Feng Bao ZHANG, Guo Liang ZHANG

中国化学快报. 2005, 16(08): 1085-1088.

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可视化

Chitosan-coated nylon membranes which possess a large number of reactive groups of-CH₂OH and -NH₂ were prepared by coupling chitosan onto the nylon membrane. Then polylysine as ligand was also immobilized onto the composite membranes by 1, 1'-carbonyl-diimidazole activation to prepare affinity membranes for bilirubin adsorption. The results showed that these membranes exhibited high binding affinity capacities for bilirubin and the adsorption isotherm fitted the Freundlich model well.

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Silica-supported Macroporous Chitosan Bead for Affinity Purification of Trypsin Inhibitor

Feng Na XI, Jian Min WU, Ming Ming LUAN

中国化学快报. 2005, 16(08): 1089-1092.

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可视化

Macroporous cross-linking chitosan layer coated on silica gel (CTS-SiO₂) was prepared by phase inversion and polyethylene glycol (PEG) molecular imprinting methods. Formation of macroporous surface was investigated by scanning electron microscopy (SEM) and BET analysis.The prepared bead was activated by reacting with 1,2-ethylene diglycidyl ether for introducing epoxy groups, and trypsin could be efficiently immobilized on the bead as a biospecific ligand.The bead bearing trypsin was employed to purify trypsin inhibitor (TIs) from egg white as affinity adsorbent.

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Synthesis and Three-photon Induced Nonlinear Properties of a Novel Organic Chromophore

Fu Quan GUO, Jun YANG, Qi Jin ZHANG, Hai MING

中国化学快报. 2005, 16(08): 1093-1096.

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可视化

A novel organic chromophore 4, 4'-bis(9-carbazyl-trans-styryl)-biphenyl (BCSBP) has been synthesized and characterized by ¹HNMR and elemental analysis. Three-photon absorption (3PA) induced upconvention fluorescence was observed and large 3PA cross section as high as 10^-74 cm⁶ s² was obtained for nanosecond laser pulses at 1064 nm from optical limiting measurements.

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Synthesis and Three-photon Induced Nonlinear Properties of a Novel Organic Chromophore

Jing Yin FEI, Guo Zheng LIANG, Wen Li XIN, Jiang Hong LIU

中国化学快报. 2005, 16(08): 1097-1100.

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可视化

Pulse plating of Zn-Co alloys was studied using square pulse containing reverse current.The surface morphologies of Zn-Co alloy deposits were examined using scanning electron microscopy (SEM), and an attendant energy dispersive X-ray analyzer (EDA) was used to analyze the composition of Zn-Co alloy deposits. Results obtained showed that the average current density and reverse current density amongst all the variables investigated had very strong effects on the cobalt content and surface morphologies of Zn-Co alloy deposits. It is possible to electrodeposit Zn-Co alloy coatings with a very wide cobalt content range of 10-90 wt% by modulating pulse parameters.

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Low-temperature Growth of Single-crystal SrCO₃ Nanoneedles

Guang Sheng GUO, Fu Bo GU, Zhi Hua WANG, Hong You GUO

中国化学快报. 2005, 16(08): 1101-1104.

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可视化

Single-crystal SrCO₃ nanoneedles were synthesized in reverse micelles at low temperature. The products were characterized by X-ray diffraction, X-ray energy dispersive spectrometer, transmission electron microscopy and selected area electronic diffraction. The influences of experimental conditions on the morphologies of the products were discussed. The growth mechanism of SrCO₃ nanoneedles in reverse micelles were proposed.

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Sonocatalytic Damage of Bovine Serum Albumin (BSA) in the Presence of Nanometer Titanium Dioxide (TiO₂) Catalyst

Jun WANG, Jing WU, Zhao Hong ZHANG, Xiang Dong ZHANG, Lei WANG, Liang XU, Bao Dong GUO, Hong LI, Jian TONG

中国化学快报. 2005, 16(08): 1105-1108.

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可视化

The sonocatalytic damage of bovine serum albumin (BSA) was studied in the presence of nanometer titanium dioxide (TiO₂) powders by low frequency (80 kHz) ultrasound. The destruction of secondary structure and change of α-helical structure of BSA were reflected by ultraviolet (UV) and circular dichroism (CD) spectroscopies.

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Preparation and Characterization of Three-dimensionally Ordered Crystalline Macroporous CeO₂

Xi Yan ZHANG, Tong Wen WANG, Wen Qing JIANG, Di WU, Ling LIU, Ai Hong DUAN

中国化学快报. 2005, 16(08): 1109-1112.

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可视化

A stable 3DOM CeO₂ with well-defined inverse opal microstructure and crystalline walls structure has been successfully synthesized by application of three-dimensional order PMMA beads as templates. Strucural feature of products was characterized by using SEM, DTA-TG, XRD.

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Synthesis and Magnetic Properties of Polyamide Complex Containing Bithiazole Moieties

Hong Zhou GAO, Wei Lin SUN, Zhi Quan SHEN

中国化学快报. 2005, 16(08): 1113-1116.

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可视化

A new polyamide containing bithiazole moieties (PTA) was synthesized by the polycondensation of 2, 2'-diamino-4, 4'-bithiazole (DABT) and oxalyl chloride. The polymer complex was prepared from PTA and NdCl₃ in DMSO. They were characterized through IR and elemental analysis. The preliminary magnetic properties of the complex PTA-Nd³⁺ was investigated, it was found that the material is a ferromagnet at low temperature.

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Synthesis of Exfoliated MEH-PPV/Clay Nanocomposites

Chao Jun JING, Liu Sheng CHEN, Yi SHI, Xi Gao JIN

中国化学快报. 2005, 16(08): 1117-1120.

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可视化

The synthesis of poly(2-methoxy-5-(2'-ethyl-hexyloxy)-l,4-phenylenevinylene) (MEHPPV) in the presence of organophilic montmorillonite (OMMT) was reported and the exfoliated MEH-PPV/OMMT nanocomposites was obtained by controlling the ratio of the monomer to the OMMT.

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Instant Effects of Radiofrequency Electromagnetic Wave on Hemoglobin in Single Living Intact Red Blood Cell

Cheng Can YAO, Xiao Kun LI, Yao Xiong HUANG

中国化学快报. 2005, 16(08): 1121-1124.

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可视化

The absorption spectrum of the hemoglobin (Hb) in single living intact red blood cell (RBC), exposed in 900 MHz radiofrequency electromagnetic wave (RF-EMW), was non-invasive,in situ, real-time measured by employing a highly sensitive fast multi-channel micro-spectrophotometer system. Both the absorption intensity and site of intracellular Hb were altered after RBCs were exposed in 900 MHz RF-EMW with power density at 5 mW/cm². It was indicated that not only the concentration of Hb in living RBCs was decreased, but the molecular structure of Hb was changed by the RF-EMW action.

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1-Imino Nitroxide Pyrene,a Burst-type H⁺ Fluorescent Switch

Jun LI, Hong Mei WANG, Hui Min MA, De Qing ZHANG, Shao Xiang XIONG

中国化学快报. 2005, 16(08): 1125-1128.

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可视化

1-Imino nitroxide pyrene 1 has been characterized as a H⁺ fluorescent switch. The effects of various interfering species, solvents and the irradiation of ultraviolet light on the fluorescence intensity of 1 are also investigated. 1 fluoresces weakly in the 85% ethanol media containing no more than 4.5×10^-5 mol/L of H⁺ (HCl), but can produce a burst increase of about 4times in the fluorescence intensity when the concentration of H+ is increased to or over 4.9×10^-5mol/L. The extremely sharp response of 1 to H⁺ occurs only within such a narrow concentration range. Moreover, the decrease of H⁺ concentration through adding sodium hydroxide causes the fluorescence quenching, suggesting that 1 may serve as a fluorescent switch for monitoring the concentration change of H⁺ around the point of 4.5×10^-5 mol/L.

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Degradation Mechanism of Phenol in C/PTFE O₂-Fed Cathode by Determining the Product of Oxygen Electroreduction

Hui WANG, Xiu Juan YU, De Zhi SUN

中国化学快报. 2005, 16(08): 1129-1132.

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可视化

A terylene membrane which kept pH>12 in cathode compartment was used to construct a divided cell with a carbon/polytetrafluoroethylene (C/PTFE) O₂-fed cathode. The concentrations of hydrogen peroxide(H₂O₂)and hydroxyl radical(HO)in the catholyte were 8.3mg/L and 2.15 μmol/L, respectively, which were determined by permanganate titration, electron spin resonance (ESR) spectrum and the fluorescence spectra. The efficiency of the removal of phenol achieved 100% as a result of these two kinds of stronger oxidizer.

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A New Hybrid Model of Amino Acid Substitution for Protein Functional Classification

Ke Long WANG, Zhi Ning WEN, Fu Sheng NIE, Meng Long LI

中国化学快报. 2005, 16(08): 1133-1136.

摘要 ( )

可视化

In this paper, a new hybrid model of amino acid substitution is developed and compared with the others in previous works. The results show that the new hybrid model can characterize the protein sequences very well by calculating Fisher weights, which can denote how much the variants contribute to the classification.

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2005年, 第16卷, 第08期　刊出日期：2005-08-20

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2005年, 第16卷, 第08期 刊出日期：2005-08-20

2005年, 第16卷, 第08期　刊出日期：2005-08-20