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Simultaneous Determination of Fluorescein, Rhodamine 6G and Rhodamine B in Turbid Solution by Polarization Variable-Angle Synchronous Fluorescence Spectrometry

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Chinese Chemical Letters 2000年第7期11卷 613-614页

作者： Yao Qun LI Fang QIAN Xian Zhi HUANG(Department of Chemistry and key laboratory of analytical sciences of the Ministry of Education,xiamen university, xiamen 361.05) xiamen Univ Dept Chem Xiamen 361005 Peoples R China xiamen Univ Key Lab Analyt Sci Minist Educ Xiamen 361005 Peoples R China

Polarization variable-angle synchronous fluorescence spectrometry was proposed to determine samples in turbid solution. A mixture of fluorescein, rhodamine 6G and rhodamine B was used to evaluate the technique. The background caused by scattering light was decreased remarkably. The limits of detection were 0.6 ng/ml for fluorescein, 2.3 ng/ml for rhodamine 6G and 4.1 ng/ml for rhodamine B, respectively.

关键词： variable-angle synchronous fluorescence polarization fluorescein rhodamine 6G rhodamine B

SYNTHESIS OF POLYCATECHOL WITH ELECTROCHEMICAL ACTIVITY AND ITS PROPERTIES

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Chinese Journal of Polymer Science 2002年第6期20卷 517-524页

作者： Yong Kong Shao-lin Mu Bing-wei Mao Department of Chemistry School of sciences, Yangzhou university Yangzhou 225002, china State key laboratory of Physical Chemistry of the Solid Surface, xiamen university,xiamen 361.05, china Yangzhou Univ Sch Sci Dept Chem Yangzhou 225002 Peoples R China xiamen Univ State Key Lab Phys Chem Solid Surface Xiamen 361005 Peoples R China

The electrochemical polymerization of catechol on platinum has been carried out using repeated potential cycling between -0.2 and 1.1 V (versus SCE). The electrolytic solution consisted of 0.2 mol dm(-3) catechol, 0.5 mol dm(-3) NaCl and 0.1 mol dm(-3) Na2HPO4 with pH 8.72. Catechol can not be polymerized at pH greater than or equal to 10.12. Polycatechol has an electrochemical lactivity at pH less than or equal to 4. The anodic and cathodic peak potentials of polycatechol shift towards more negative values as the pH of the solution increases from 1 to 4. The electrochemical activity of polycatechol hardly changes in this pH region, but it decreases slowly with time. This is caused by oxygen in air, which leads to an irreversible oxidation of polycatechol. This property is favorable for protecting metals from corrosion. Raman and FTIR spectra of polycatechol and catechol are quite different. AFM images of polycatechol films provide evidence that the image of the oxidized state of polycatechol is markedly different from that of the reduced one. This difference is caused by doping and dedoping of polycatechol.

关键词： catechol polycatechol electrochemical activity Raman spectra FTIR spectra AFM images

Cell cycle and cell signal transduction in marine phytoplankton

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Progress in Natural Science:Materials International 2006年第7期16卷 671-678页

作者： LIU Jingwen, JIAO Nianzhi and CAI Huinong ( Bioengineering School of Jimei university, xiamen 361021, china State key laboratory of Marine Environmental sciences of xiamen university, xiamen 361.05, china) [a]Bioengineering School of Jimei university Xiamen China [b]State key laboratory of marine Environmental Science of xiamen university Xiamen China

As unicellular phytoplankton, the growth of a marine phytoplankton population results directly from the completion of a cell cycle, therefore, cell-environment communication is an important way which involves signal transduction pathways to regulate cell cycle progression and contribute to growth, metabolism and primary production and respond to their surrounding environment in marine phytoplankton. Cyclin-CDK and CaM/Ca2+ are essentially key regulators in control of cell cycle and signal transduction pathway, which has important values on both basic research and applied biotechnology. This paper reviews progress made in this research field, which involves the identification and characterization of cyclins and cell signal transduction system, cell cycle-control mechanisms in marine phytoplankton cells, cell cycle proteins as a marker of a terminal event to estimate the growth rate of phytoplankton at the species level, cell cycle-dependent toxin production of toxic algae and cell cycle progression regulated by environmental factors.

关键词： marine phytoplankton cell cycle cell signal transduction.

Progress in the development of techniques based on light scattering for single nanoparticle detection

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Science china Chemistry 2011年第8期54卷 1244-1253页

作者： ZHU ShaoBin, WANG Shuo, YANG LingLing, HUANG TianXun & YAN XiaoMei Department of Chemical Biology, College of Chemistry and Chemical Engineering key laboratory for Chemical Biology of Fujian Province key laboratory of analytical Science, xiamen university, xiamen 361.05, china 1. Department of Chemical Biology College of Chemistry and Chemical Engineering key laboratory for Chemical Biology of Fujian Province key laboratory of analytical Science Xiamen University Xiamen 361005 China

Nanoparticles have recendy attracted extensive attention in view of their great potential in biomedicine and bioanalytical applications. Single particle detection via light scattering offers a simple and efficient approach for the size, size distribution, and concentration analysis of nanoparticles. In particular, intrinsic heterogeneity or rare events masked by ensemble averaging can be revealed. However, the sixth power dependence of Rayleigh scattering on particle size makes it very challenging to detect individual nanoparficles of small sizes. This article is intended to provide an overview of recent progress in the development of techniques based on light scattering for the detection of single nanoparticles.

关键词： light scattering single particle detection nanoparticles confocal correlation spectroscopy flow cytometry

An eigenfunction expansion method for the elastodynamic response of an elastic solid with mixed boundary surfaces

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Progress in Natural Science:Materials International 2008年第9期18卷 1063-1068页

作者： Liguo Tang a,b,*, Jianchun Cheng c a Department of Oceanography, xiamen university, xiamen 361.05, china b key laboratory of Underwater Acoustic Communication, and Marine Information Technology, Ministry of Education, xiamen university, xiamen 361.05, china c laboratory of Modern Acoustics and Institute of Acoustics, Nanjing university, Nanjing 210093, china Department of Oceanography Xiamen University Xiamen 361005 China key laboratory of Underwater Acoustic Communication and Marine Information Technology Ministry of Education Xiamen University Xiamen 361005 China laboratory of Modern Acoustics and Institute of Acoustics Nanjing University Nanjing 210093 China

The method of eigenfunction expansion is one of the most elegant methods for solving elastodynamic problems. The solution obtained from it is more concise than that obtained from the integral transform technique. Traditional eigenfunction expansion method is used for the elastodynamic problems with displacement and traction boundary conditions. In this paper, the method is generalized to study the elastodynamic response of an elastic solid with mixed boundary surfaces, and the exact analytical solution is derived. The dynamic response of a finite-length solid aluminum cylinder with two mixed end boundaries is numerically evaluated. The result com- puted from the analytical solution agrees very well with that obtained from finite element method (FEM).

关键词： Eigenfunction expansion Elastodynamic response Mixed boundary

REMOVABLE EARS OF 1-EXTENDABLE GRAPHS

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Journal of Systems Science & Complexity 2010年第2期23卷 372-378页

作者： Shaohui ZHAI Xiaofeng GUO Department of Mathematics and Physics Xiamen University of Technology Xiamen 361024 China. School of Mathematical sciences Xiamen University Xiamen 361005 China.

Carvalho, Lucchesi and Murty proved that any 1-extendable graph G different from K2 and C2n has at least A（G） edge-disjoint removable ears, and any brick G distinct from K4 and C6 has at least A（G） - 2 removable edges, where A（G） denotes the maximum degree of G. In this paper, we improve the lower bounds for numbers of removable ears and removable edges of 1-extendable graphs. It is proved that any 1-extendable graph G different from K2 and C2n has at least x′（G） edge-disjoint removable ears, and any brick G distinct from Ka and Ce has at least x′（G） - 2 removable edges, where x′（G） denotes the edge-chromatic number of G. key words 1-extendable graphs, removable ear, removable edge.

关键词： 1-extendable graphs removable ear removable edge.

Density-controlled growth of well-aligned ZnO nanowires using chemical vapor deposition

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Science china(Technological sciences) 2010年第3期53卷 766-768页

作者： WU ZhiMing,LIN XianGan,HUANG Kai,LI ShuPing&KANG JunYong key laboratory of Semiconductors and Applications,Department of Physics,xiamen university,xiamen 361.05,china 1. key laboratory of Semiconductors and Applications Department of Physics Xiamen University Xiamen 361005 China

Well-aligned ZnO nanowires were grown on Si substrate by chemical vapor *** experimental results showed that the density of nanowires was related to the heating process and growth ***-density ZnO nanowires were obtain... 详细信息

关键词： density-controlled ZnO nanowires thermal evaporation

Bacterial community in deep subseafloor sediments from the western Pacific "warm pool"

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Science china Earth sciences 2008年第4期51卷 618-624页

作者： ZHAO Jing1 & ZENG RunYing2 1 College of Oceanography and Environmental Science, xiamen university, xiamen 361.05, china 2 key laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, State Oceanic Administration, xiamen 361.05, china College of Oceanography and Environmental Science Xiamen University Xiamen 361005 China key laboratory of Marine Biogenetic Resources Third Institute of Oceanography State Oceanic Administration Xiamen 361005 China

The bacterial community in deep subseafloor sediments at a depth of 230 cm from the western Pacific "warm pool" is studied by construction of 16S rDNA clone library and PCR-RFLP (Restriction Fragment Length Polymorphism) analysis. The results indicate that the bacterial community in these sediments is mainly composed of five groups: α-Proteobacteria, β-Proteobacteria, CFB group (Cytophaga / Flexi-bacteria / Bacteroides), Acidobacteria and gram positive bacteria, with a few genera detected in each group. The most abundant bacteria group is α-Proteobacteria, and the next is β-Proteobacteria. The dominant species in α-and β-Proteobacteria are Sphingomonas paucimobilis and Pseudomonas alca-ligenes respectively. The CFB group is simply composed of members belonging to Flavobacterium. The gram positive bacteria are rich, and mainly consists of the genus Geobacillus. The analysis of bacterial community indicates that organic matter is still abundant in the subseafloor sediments at the depth of 230 cm in the western Pacific "warm pool" . These bacteria in this deep biosphere may play an impor-tant role in the nitrogen cycle of deep sea sediments at "warm pool" .

关键词： western Pacific 'warm pool' deep subseafloor sediment bacterial community

Square ZnO nano-column and its thermal evolution

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Science china(Technological sciences) 2010年第2期53卷 309-312页

作者： HUANG BinWang, ZHAN HuaHan, WU YaPing, CHEN XiaoHang & KANG JunYong key laboratory of Semiconductor Materials and Applications, Department of Physics, xiamen university, xiamen 361.05, china 1. key laboratory of Semiconductor Materials and Applications Department of Physics Xiamen University Xiamen 361005 China

Square ZnO nano-columns have been manufactured by molecular beam epitaxy on p-type Si (100) substrate. The morphology and the evolution sequences after thermal annealing were investigated by in-situ scanning tunneling microscopy. We associated the morphology and microstructure evolution with the cubic Si (100) substrate, large lattice mismatching, the coexistence of wurtzite and zincblende phases of ZnO, and the thermal effect.

关键词： ZnO square nano-column anneal wurtzite phase zincblende phase Si (100)