Accession Number:071110482717

检索时间：2008.1.3 出版时间：2007 143条

Accession number:071110482717

Title:Microwave-assisted four-component, one-pot condensation reaction: An efficient synthesis of annulated pyridines

Authors:Yan, Chao-Guo; Cai, Xi-Mei; Wang, Qi-Fang; Wang, Ting-Yu; Zheng, Ming

Author affiliation:College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, China

Serial title:Organic and Biomolecular Chemistry

Abbreviated serial title:Org. Biomol. Chem.

Volume:v 5

Issue:n 6

Publication year:2007

Pages:p 945-951

Language:English

ISSN:1477-0520

Document type:Journal article (JA)

Publisher:Royal Society of Chemistry, Cambridge, CB4 OWF, United Kingdom

Abstract:A one-pot, effective synthesis of pyridines by a modified Krohnke procedure is described. Polysubstituted annulated pyridines were synthesized in high yields by four-component, one-pot cyclocondensation reactions of N-phenacylpyridinium bromide, aromatic aldehydes, acetophenones or cyclic ketones in the presence of ammonium acetate and acetic acid, assisted by microwave irradiation. In this procedure, cyclic ketones with two α-CH2 groups yield annulated pyridines with additional α-benzylidene groups, which are derived in situ from double aldol condensation of cyclic ketones with two moles of aromatic aldehydes. This journal is © The Royal Society of Chemistry.

Number of references:41

Ei main heading:Synthesis (chemical)

Ei controlled terms:Acetic acid - Aldehydes - Bromine compounds - Condensation reactions - Ketones - Microwaves

Uncontrolled terms:Pyridines - Aldols - Cyclic ketones - Aromatic aldehydes

Ei classification codes:711 Electromagnetic Waves - 802.2 Chemical Reactions - 804.1 Organic Compounds - 804.2 Inorganic Compounds

Treatment:Experimental (EXP)

DOI:10.1039/b617256c

Database:Compendex

Accession number:071210496294

Title:O-Carboxymethylchitosan-based novel gatifloxacin delivery system

Authors:Zhu, Aiping; Jin, Wenjie; Yuan, Lanhua; Yang, Gongjun; Yu, Hui; Wu, Hao

Author affiliation:College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, China

Serial title:Carbohydrate Polymers

Abbreviated serial title:Carbohydr Polym

Volume:v 68

Issue:n 4

Issue date:Apr 23 2007

Publication year:2007

Pages:p 693-700

Language:English

ISSN:0144-8617

CODEN:CAPOD8

Document type:Journal article (JA)

Publisher:Elsevier Ltd, Oxford, OX5 1GB, United Kingdom

Abstract:The increase in the treatment efficacy due to the enhanced permeability and retention properties and the decrease in the minimum inhibitory concentration (MIC) are the vital challenges related to the administration of the antibiotic drugs. In the present paper, we describe a novel delivery system of gatifloxacin (GFLX) from O-carboxymethylchitosan (OCMCS). GFLX is a fourth-generation fluoroguinolone, which has shown promise with excellent activity against both Gram-positive cocci and Gram-negative bacteria both in vitro and in vivo. OCMCS is a biocompatible amphiphilic derivative of chitosan. GFLX could be entrapped into OCMCS by the interaction between OCMCS and GFLX, which was characterized by fluorescence spectrum, transmission electron microscope, and dynamic light scattering techniques. The release behaviors of GFLX from this proposed delivery system in phosphate-buffered saline (PBS) solution at 37 °C were studied by fluorescence spectroscopy. The MIC of OCMCS formulation was evaluated. The results demonstrate that the release of GFLX from OCMCS formulation is slower than that from GFLX solution. In vitro bacteria antiproliferative activity assay confirms that the MIC of OCMCS formulation against Gram-negative bacteria is fourfold lower than the system without OCMCS. However, it seems that OCMCS has insignificant effect against Gram-positive bacteria. These results suggest that OCMCS matrix has obvious "transmission effect" on Gram-negative bacteria. © 2006.

Number of references:35

Ei main heading:Drug products

Ei controlled terms:Bacteria - Biocompatibility - Chitin - Drug delivery - Escherichia coli - Fluorescence spectroscopy

Uncontrolled terms:Carboxymethylchitosan - Gatifloxacin - Staphylococcus - Minimum inhibitory concentration (MIC)

Ei classification codes:461.6 Medicine and Pharmacology - 461.9 Biology - 461.9.1 Immunology - 741.3 Optical Devices and Systems - 804.1 Organic Compounds - 941.3 Optical Instruments - 941.4 Optical Variables Measurements

Treatment:Experimental (EXP)

DOI:10.1016/j.carbpol.2006.08.007

Database:Compendex

Accession number:071210507737

Title:Study on the inclusion interactions of β-cyclodextrin and its derivative with dyes by spectrofluorimetry and its analytical application

Authors:Zhu, Xiashi; Sun, Jing; Wu, Jun

Author affiliation:College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, China

Serial title:Talanta

Abbreviated serial title:Talanta

Volume:v 72

Issue:n 1

Issue date:Apr 15 2007

Publication year:2007

Pages:p 237-242

Language:English

ISSN:0039-9140

CODEN:TLNTA2

Document type:Journal article (JA)

Publisher:Elsevier, Amsterdam, 1000 AE, Netherlands

Abstract:The inclusion interactions of β-cyclodextrin (β-CD) and hydroxypropyl-β-cyclodextrin (HP-β-CD) with dyes were developed by spectrofluorimetry, and the inclusion constants of inclusion complexes were determined by direct fluorescence technique. The main factors (the host molecule, the guest molecule, and the pH) for the inclusion interaction were discussed in detail. At the same time, the inclusion interaction of HP-β-CD and vitamin B6 (VB6) was investigated with the competitive fluorescence inclusion method and the inclusion constant of HP-β-CD and vitamin B6 (VB6) was obtained by indirect fluorescence technique. On the basis of the linear relationship between the change of fluorescence intensity (ΔF) and the concentration of VB6, a competitive fluorescence inclusion method was used to the determination of VB6. The method has been successfully applied to the analysis of VB6 in synthetic samples, tablets and injections with satisfactory results. © 2006 Elsevier B.V. All rights reserved.

Number of references:21

Ei main heading:Cyclodextrins

Ei controlled terms:Derivatives - Drug products - Dyes - Fluorometers - Spectroelectrochemistry - Vitamins

Uncontrolled terms:Cyclodextrin - Spectrofluorimetry - Competitive inclusion - VB6

Ei classification codes:461.6 Medicine and Pharmacology - 461.7 Health Care - 801.4.1 Electrochemistry - 803 Chemical Agents and Basic Industrial Chemicals - 804.1 Organic Compounds - 941.3 Optical Instruments

Treatment:Theoretical (THR); Experimental (EXP)

DOI:10.1016/j.talanta.2006.10.016

Database:Compendex

Accession number:071310513867

Title:Adaptive fuzzy control for a class of MIMO nonlinear systems with unknown dead-zones

Authors:Zhang, Tian-Ping; Yi, Yang

Author affiliation:Department of Computer, College of Information Engineering, Yangzhou University, Yangzhou 225009, China

Serial title:Zidonghua Xuebao/Acta Automatica Sinica

Abbreviated serial title:Zidonghua Xuebao

Volume:v 33

Issue:n 1

Issue date:January 2007

Publication year:2007

Pages:p 96-100

Language:English

ISSN:0254-4156

CODEN:ZIXUDZ

Document type:Journal article (JA)

Publisher:Science Press, Beijing, 100085, China

Abstract:A design scheme of adaptive fuzzy controller for a class of uncertain MIMO nonlinear systems with unknown dead-zones and a triangular control structure is proposed in this paper. The design is based on the principle of sliding mode control and the property of Nussbaum function. The approach does not require a priori knowledge of the signs of the control gains and the upper bounds and lower bounds of dead-zone parameters to be known a priori. By introducing the integral-type Lyapunov function and adopting the adaptive compensation term of the upper bound of the optimal approximation error and the dead-zone disturbance, the closed-loop control system is proved to be semi-globally stable in the sense that all signals involved are bounded, with tracking errors converging to zero.

Number of references:15

Ei main heading:Fuzzy control

Ei controlled terms:Closed loop control systems - Control equipment - Lyapunov functions - Nonlinear systems - Sliding mode control

Uncontrolled terms:Dead zone - Adaptive control - Nussbaum function - Tracking errors

Ei classification codes:731 Automatic Control Principles and Applications - 732.1 Control Equipment

Treatment:Applications (APP)

DOI:10.1360/aas-007-0096

Database:Compendex

Accession number:071310514029

Title:Effect of shear deformation and rotatory inertia on vibration characteristics of ultrasonic motor

Authors:Mo, Yueping; Hu, Minqiang; Jin, Long; Duan, Xiaohui

Author affiliation:College of Energy and Power Engineering, Yangzhou University, Yangzhou 225009, China

Serial title:Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition)

Abbreviated serial title:Dongnan Daxue Xuebao

Volume:v 37

Issue:n 1

Issue date:January 2007

Publication year:2007

Pages:p 56-59

Language:Chinese

ISSN:1001-0505

CODEN:DDXZB9

Document type:Journal article (JA)

Publisher:Southeast University, Nanjing, 210096, China

Abstract:The basic vibration theories of beams are recommended and applied to analysis and calculation of vibration mode and natural frequency of both ring-type and cylindrical-type ultrasonic motor. The effect of shear deformation and rotatory inertia to the vibration characteristics of ultrasonic motor is investigated. The results show that Bernoulli-Euler beam theory can be used to estimate the vibration characteristic of large diameter ring-type ultrasonic motor, however, to calculate the vibration characteristic of cylindrical-type ultrasonic motor, Timoshenko beam theory must be applied because the effect of shear deformation and rotatory inertia need to be considered.

Number of references:15

Ei main heading:Vibrations (mechanical)

Ei controlled terms:Calculations - Shear deformation - Ultrasonics

Uncontrolled terms:Ultrasonic motor - Vibration characteristics - Rotatory inertia - Natural frequency

Ei classification codes:422 Strength of Building Materials; Test Equipment and Methods - 753.1 Ultrasonic Waves - 921 Mathematics - 931.1 Mechanics

Treatment:Experimental (EXP)

Database:Compendex

Accession number:071810576558

Title:Ferroelectric and piezoelectric properties of bismuth titanate ceramic with different orientation degrees of grain

Authors:Mao, Xiangyu; Wang, Wei; Wang, Wei; Chen, Xiaobing

Author affiliation:College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China

Serial title:Kuei Suan Jen Hsueh Pao/ Journal of the Chinese Ceramic Society

Abbreviated serial title:Kuei Suan Jen Hsueh Pao

Volume:v 35

Issue:n 3

Issue date:March 2007

Publication year:2007

Pages:p 312-316

Language:Chinese

ISSN:0454-5648

CODEN:KSYHA5

Document type:Journal article (JA)

Publisher:Chinese Ceramic Society, Beijing, 100831, China

Abstract:Several polycrystalline bismuth titanate Bi4Ti3O12(BTO) ceramic samples with different degrees of grain orientation (I) were prepared using the solid state reaction. Under the identical temperature, when the sintering time (2-20 h) increases, the I increases initially and reaches its maximum value of 89.9% then decreases. The ferro-and piezoelectric properties are dependent on the I. The two times of remanent polarization intensity (Pr) and piezoelectric coefficient (d33) of a/(b)-orientation predominant BTO samples increases with the increase of I and the maximum values are 53.4 μC/cm2 and 22.2 pC/N, respectively, while the 2Pr and d33 decreases with the increase of I in c-orientation predominant ones.

Number of references:17

Ei main heading:Ceramic materials

Ei controlled terms:Bismuth compounds - Crystal orientation - Ferroelectricity - Piezoelectricity - Polycrystalline materials - Sintering - Solid state reactions

Uncontrolled terms:Bismuth titanate ceramic - Grain orientation - Ferroelectric properties - Piezoelectric properties

Ei classification codes:701.1 Electricity: Basic Concepts and Phenomena - 708.1 Dielectric Materials - 802.2 Chemical Reactions - 802.3 Chemical Operations - 804.2 Inorganic Compounds - 812.1 Ceramics - 933.1 Crystalline Solids

Treatment:Experimental (EXP)

Database:Compendex

<RECORD 7

Accession number:073710809030

Title:Effect of Co2+, Ni2+, Cu2+, or Zn 2+ on properties of polyaniline nanoparticles

Authors:Zhou, Su; Wu, Tao; Kan, Jinqing

Author affiliation:School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China

Serial title:Journal of Applied Polymer Science

Abbreviated serial title:J. Appl. Polym. Sci.

Volume:v 106

Issue:n 1

Issue date:Oct 5 2007

Publication year:2007

Pages:p 652-658

Language:English

ISSN:0021-8995

CODEN:JAPNAB

Document type:Journal article (JA)

Publisher:John Wiley and Sons Inc., Newark, NJ 07191-8667, United States

Abstract:Uniform polyaniline (PANI) nanoparticles with typical sizes of about 50 nm were electropolymerized on indium tin oxide surfaces in the presence of Co 2+, Ni2+, Cu2+, or Zn2+. According to shaping theory, we first suggest the reason forming PANI spherical particles. Their conductivity, UV-vis spectra, FTIR spectra, X-ray diffraction, and thermogravimetric analysis were investigated. The conductivities and crystallinity of PANI doped with these ions are higher than those of PANI doped with HCl (PAM/HC1). Both UV-vis absorption spectra and FTIR spectra indicate the interactions between Co2+, Ni2+, Cu2+, or Zn2+ and PANI chains. TG analysis also shows that the thermal stability of PANI doped by Co2+, Ni2+, Cu2+, or Zn2+ is lower than that ofPANI/ HCl. © 2007 Wiley Periodicals, Inc.

Number of references:58

Ei main heading:Positive ions

Ei controlled terms:Electropolymerization - Fourier transform infrared spectroscopy - Nanoparticles - Polyaniline - Scanning electron microscopy - Thermodynamic stability - Thermogravimetric analysis - X ray diffraction

Uncontrolled terms:Indium tin oxide - Crystallinity - Shaping theory

Ei classification codes:641.1 Thermodynamics - 701.1 Electricity: Basic Concepts and Phenomena - 708.2 Conducting Materials - 741.1 Light/Optics - 761 Nanotechnology - 801 Chemistry - 815.1.1 Organic Polymers - 815.2 Polymerization - 931.3 Atomic and Molecular Physics - 933 Solid State Physics

Treatment:Literature review (LIT); Experimental (EXP)

DOI:10.1002/app.26694

Database:Compendex

Accession number:074010846776

Title:Synthesis of poly(o-phenylenediamine) hollow spheres and nanofibers using different oxidizing agents

Authors:Han, Jie; Song, Genping; Guo, Rong

Author affiliation:School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002 Jiangsu, China

Serial title:European Polymer Journal

Abbreviated serial title:Eur Polym J

Volume:v 43

Issue:n 10

Issue date:October 2007

Publication year:2007

Pages:p 4229-4235

Language:English

ISSN:0014-3057

CODEN:EUPJAG

Document type:Journal article (JA)

Publisher:Elsevier Ltd, Oxford, OX5 1GB, United Kingdom

Abstract:Poly(o-phenylenediamine) (PoPD) hollow spheres (ca. 800 nm in outer diameter) were synthesized by a simple solution route using ammonium persulfate (APS) as the oxidizing agent, whereas PoPD nanofibers (0.5-2 μm in width and more than 100 μm in length) and gold nanoparticles (200-500 nm) were obtained when changing the oxidizing agent of APS to chlorauric acid (HAuCl4). The chemical structures of PoPD hollow spheres and nanofibers were characterized by FTIR and XRD spectra. When using HAuCl4 as the oxidizing agent, the products of PoPD nanofibers and gold nanoparticles could be separated by chemical methods. The monomer droplets were proposed to act as template to the formation of polymer hollow spheres while the oriented growth of polymer nanofibers might be catalyzed by gold nanoparticles. © 2007 Elsevier Ltd. All rights reserved.

Number of references:34

Ei main heading:Amines

Ei controlled terms:Coupling agents - Gold - Monomers - Nanofibers - Nanoparticles - Oxidation - Synthesis (chemical)

Uncontrolled terms:Chlorauric acid - Hollow sphere - Oxidizing agents - Gold nanoparticles - XRD spectra

Ei classification codes:547.1 Precious Metals - 761 Nanotechnology - 802.2 Chemical Reactions - 803 Chemical Agents and Basic Industrial Chemicals - 804.1 Organic Compounds - 933 Solid State Physics

Treatment:Theoretical (THR); Experimental (EXP)

DOI:10.1016/j.eurpolymj.2007.06.012

Database:Compendex

<RECORD 9

Accession number:065210328104

Title:Structure behaviors of hemoglobin in PEG 6000/Tween 80/Span 80/H2O niosome system

Authors:Liu, Tianqing; Guo, Rong; Hua, Wei; Qiu, Jing

Author affiliation:School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jinagsu, 25002, China

Serial title:Colloids and Surfaces A: Physicochemical and Engineering Aspects

Abbreviated serial title:Colloids Surf. A Physicochem. Eng. Asp.

Volume:v 293

Issue:n 1-3

Issue date:Feb 1 2007

Publication year:2007

Pages:p 255-261

Language:English

ISSN:0927-7757

CODEN:CPEAEH

Document type:Journal article (JA)

Publisher:Elsevier, Amsterdam, 1000 AE, Netherlands

Abstract:The structure behaviors of Hemoglobin (Hb) are in detail studied by the methods of UV-vis and fluorescence spectra, circular dichroism, negative staining-TEM, FF-TEM and electrochemistry techniques in PEG 6000/Tween 80/Span 80/H2O niosome system. The obtained results show that Hb can be adsorbed and outspread on the surface of the niosome membrane. The intensities of the UV-vis and fluorescence spectra of Hb in Hb/niosome system are greater than those in Hb/H2O system. The structure behaviors of Hb are partially stabilized and protected in Hb/niosome system. With the increase of PEG 6000 content in the niosome system, the content of α-helix structure decreases but the contents of β-sheet and random increase for Hb. The content of β-turn structure is almost independent of PEG 6000 content. The negative zeta potential of Hb and the conductivity of the system all decrease. The zeta potential of the niosome firstly decreases and then increases. © 2006 Elsevier B.V. All rights reserved.

Number of references:36

Ei main heading:Hemoglobin

Ei controlled terms:Polyethylene glycols - Fluorescence - Electrochemistry - Transmission electron microscopy - Ultraviolet spectroscopy - Electric conductivity

Uncontrolled terms:Niosome - Structure behavior - Vesicles - Circular dichroism

Ei classification codes:461.2 Biological Materials and Tissue Engineering - 804 Chemical Products Generally - 815.1.1 Organic Polymers - 741.1 Light/Optics - 801.4.1 Electrochemistry - 741.3 Optical Devices and Systems - 701.1 Electricity: Basic Concepts and Phenomena

Treatment:Theoretical (THR); Experimental (EXP)

DOI:10.1016/j.colsurfa.2006.07.053

Database:Compendex