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Biological activity of a red-tide alga—A. tamarense under co-cultured condition with bacteria

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Journal of Environmental Sciences 2005年第6期17卷 1047-1050页

作者： SU Jian-qiang YU Zhi-ming tian Yun SONG Xiu-xian HONG Hua-sheng zheng tian-ling School of Life Sciences Xiamen University Xiamen 361005 China State Key Laboratory of Marine Environmental Science Xiamen University Xiamen 361005 China Key Laboratory of Marine Ecology and Environmental Science ChineseAcademy of Sciences Qingdao 266071 China

The relationship between Alexandrium tamarense （Lebour） Balech, one of red-tide alga, and two strains of marine bacteria, Bacillius megaterium（S7 ） and B. halmapulus（ S10 ） isolated from Xiamen Western Sea, was investigated by evaluating the growth state of A. tamarense and the variation of β-glucosidase activity in co-culture system. The results showed the growth and multiplication of the alga were related with the concentration, genus speciality of the bacteria, and growth stage of the alga itself. The growth of A. tamarense was obviously inhibited by S7 and S10 at high concentration. Either inhibition or promotion contributed much more clearly in earlier than in later stageof the growth of the alga. Furthermore, there was a roughly similar variation trend of the activity of extra-cellular enzyme, β- glucosidase, in the water of the separately co-cultured bacteria S7 and S10 with the alga. The β-glucosidase activity（β-GlcA） rapidly increased during the later algal growth accompanying the increase of the lysis of the alga cells. The obvious inhibition of A. tamarense by marine bacteria at high concentration and evident increase of β-GlcA in co-colture system would help us in better understanding the relationship between red-tide alga and bacteria, and also enlightened us the possible use of bacteria in the bio-control of red-tide.

关键词： Alexandrium tamarense β-glucosidase bacteria

Fabrication of sulfonated mesoporous carbon by evaporation induced self-assembly/carbonization approach and its supercapacitive properties

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Chinese Chemical Letters 2017年第4期28卷 863-867页

作者： zheng-Fang tian Ming-Jiang Xie Yu Shen Yong-zheng Wang Xue-Feng Guo Hubei Key Laboratory for Processing and Application of Catalytic Materials Huanggang Normal University Key Lab of Mesoscopic Chemistry MOE School of Chemistry and Chemical EngineeringNanjing University

Synthesis of functionalized mesoporous carbon by an easy-accessed method is of great importance towards its practical ***,an evaporation induced self-assembly/carbonization（EISAC）method was developed and applied to the synthesis of sulfonic acid group functionalized mesoporous carbon（SMC）.The final mesoporous carbon obtained by EISAC method possesses wormlike mesoporous structure,uniform pore size（3.6 nm）,large surface area of 735 m^2/g,graphitic pore walls and rich sulfonic acid ***,the resultant mesoporous carbon achieves a superior electrochemical capacitive performances（216 F/g） to phenolic resin derived mesoporous carbon（OMC,152 F/g） and commercial activated carbon（AC,119 F/g）.

关键词： Sucrose Mesoporous carbon Self-assembly/carbonization Sulfonic functionalities Supercapacitor

Acyl Thioacetamide-group Chelated Nanofiber to Adsorb Silver Ions from Aqueous Systems

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Chemical Research in Chinese Universities 2014年第4期30卷 685-689页

作者： ZHANG Chengcheng LI Xiang zheng tian ZHAO Rui WANG Ce Alan G. MacDiarmid Institute College of Chemistry Jilin University Changchun 130012 P. R. China Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education Harbin University of Science and Technology Harbin 150080 P. R. China

The acyl thioacetamide-group chelated nanofiber was prepared from polyacrylonitrile（PAN） fiber with thioacetamide as vulcanization agent by an electrospinning process combined with chemical *** was found that the chelated nanofiber displays a high adsorption capacity and adsorption selectivity for Ag（Ⅰ） ions from aqueous *** adsorption capacity of Ag（Ⅰ） ions on chelated nanofiber increases with the increase of adsorption *** of the Ag（Ⅰ） ions adsorption was found to follow pseudo-second-order rate *** on the characterization results,a possible mechanism of Ag（Ⅰ） ions adsorbed on the acyl thioacetamide-group chelated nanofiber was *** chelated nanofiber could not only chelate to Ag（Ⅰ） ions but also reduce *** study provides a promising nanofiber material for removing heavy metal ions.

关键词： Electrospinning Chelated nanofiber Adsorption

High performance strain sensor based on leather activated by micro-cracking conductive layer

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Collagen and Leather 2023年第4期5卷 76-87页

作者： Jianzhong Ma Zhijie Cheng Sha Tan tian zheng Yan Zong College of Bioresources Chemical and Materials Engineering Shaanxi University of Science and TechnologyXi'an 710021China Xi'an Key Laboratory of Green Chemicals and Functional Materials Xi'an 710021China Materials Characterization and Fabrication Platform Department of Chemical EngineeringUniversity of MelbourneParkvilleMelbourne 3010Australia

Flexible strain sensors are capable to detect external force induced strain change owing to their unique ability to convert deformation into electrical ***,micro/nano patterning of conductive layer in strain sensor is an effective method to improve its sensitivity,however the sophisticated manipulation process is limited only in laboratory *** this report,a simple and scalable fabrication strategy was used to create micro-cracking conductive layer as an alternative patterning method to achieve high performance of strain *** details,the sensor was fabricated using leather as the substrate to filtrated acidified multi-walled carbon nanotubes(a-MWCNTs)/layered double hydroxides(LDHs)*** stretching process,micro-cracking structure emerged on the percolated a-MWCNTs/LDHs layer,causing a rise up of resistance according to increasing strain and generated a detectable electrical *** prepared sensor had a large detecting range(60%),high sensitivity(GF of 7238.92 at strain 30-60%),fast response(tensile response time of 270 ms),good stability and *** sensor also inherited the advantages of leather,such as biodegradability and good air permeability,and the introduction of a-MWCNTs/LDHs further enhanced its fire retardancy *** features ensured the sensor as an eco-friendly,comfortable and safe electronic device for human motion detection.

关键词： a-MWCNTs LDHs Leather Flexible strain sensor

A rare porous zinc phosphonocarboxylate framework with high thermal stability and interesting structural transformation

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Chinese Chemical Letters 2018年第6期29卷 959-962页

作者： Yan-Jie Qi Jin-Hua Liu Wen-Xu zheng Xin-Xiong Li Shou-tian zheng State Key Laboratory of Photocatalysis on Energy and Environment College of Chemistry Fuzhou University

A rare porous zinc-organic framework with ultrahigh thermal stability over 500℃ was obtained, which exhibits a CaF2-type topology formed by 8-connected tetranuclear Zn4 clusters and 4-connected phosphonocarboxylate ligands. Interestingly, the similar reactions to the 2 zinc-organic framework but in the absence of H2 O or by the replacement of Zn2＋with Co2＋can yield three different 3 D cluster-based frameworks but with the same CaF2-type topology.

关键词： Phosphonocarboxylate ligand Metal-organic framework Stability Structural transformation Gas adsorption

Optimization of a fiber grating film sensor based on dual peak resonance

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Optoelectronics Letters 2008年第2期4卷 106-109页

作者： GU zheng-tian Xu Yan-ping DENG Chuan-lu Laboratory of Photo-electric Functional Films University of Shanghai for Science and Technology Shanghai 200093 China School of Materials Science ＆ Engineering Nanyang Technological University Singapore 639798 Singapore

Based on the dual peak resonance of long-period fiber grating（LPFG）, a novel film sensor is presented, in which films sensitive to the surrounding gases are coated on the cladding of the fiber grating region, and the intervals of the dual peak resonant wavelengths change with the film refractive index. According to the coupled-mode theory, a triple-clad numerical model is developed to analyze the relation between the sensitivity Sn and the thin film optical parameters （the film thickness h3 and the refractive index n3） and the fiber grating parameters （the grating period A and the core index modulation σ）. By using optimization method, the optimal film optical parameters and the grating structure parameters are obtained. Numerical simulation shows that the sensitivity of this scheme to refractive index of the films is predicted to be more than 10-7. The theoretic analysis provides straightforward foundation for the actual highly sensitive film sensors.

关键词：纤维光栅薄膜敏感器共振

Pseudo-random sequence generator based on the generalized Henon map

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The Journal of China Universities of Posts and Telecommunications 2008年第3期15卷 64-68页

作者： zheng Fan tian Xiao-jian SONG Jing-yi LI Xue-yan College of Electronic Science and Engineering Jilin University Changchun 130012 China

By analysis and comparison of several chaotic systems that are applied to generate pseudo-random sequence, the generalized Henon map is proposed as a pseudo-random sequence generator. A new algorithm is created to solve the problem of non-uniform distribution of the sequence generated by the generalized Henon map. First, move the decimal point of elements in the sequence to the fight; then, cut off the integer; and finally, quantify it into a binary sequence. Statistical test, security analysis, and the application of image encryption have strongly supported the good random statistical characteristics, high linear complexity, large key space, and great sensitivity of the binary sequence.

关键词： pseudo-random sequence chaos the generalized Henon map

Scoring systems for prediction of mortality in decompensated liver cirrhosis: A meta-analysis of test accuracy

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World Journal of Clinical Cases 2018年第15期6卷 995-1006页

作者： Shi-Lan Wu Yi-Xiang zheng zheng-Wen tian Meng-Shi Chen Hong-Zhuan Tan Department of Epidemiology and Health Statistics Xiangya School of Public Health Central South University Department of Infectious Diseases Xiangya Hospital Central South University

AIM To compare the accuracy of the scoring systems ChildTurcotte-Pugh(CTP), Model for End-stage Liver Disease score(MELD), MELD-Na, and MELD to Serum Sodium ratio(MESO) to predict the mortality in decompensated liver *** The PubMed, Web of Science, Cochrane Library, EMBASE, and Ovid databases were systematically searched from inception to September 2018 for relevant articles, and we evaluated the quality of the included studies. The accuracy of scoring systems was analyzed with Stata 12 and MetaDiSc *** Sixteen studies involving 2337 patients were included. The pooled areas under the summary receiver operating characteristic curves(AUROCs) of CTP, MELD, MELD-Na, and MESO to predict mortality were 0.81,0.78, 0.85, and 0.86, respectively. Within 3 mo, the AUROCs of CTP, MELD, and MELD-Na in predicting mortality were 0.78, 0.76, and 0.89, respectively. The AUROCs of CTP, MELD, and MELD-Na at 3 mo were 0.86, 0.78, and 0.86, respectively. The AUROCs of CTP, MELD, and MELD-Na at 6 mo were 0.91, 0.83, and 0.90, respectively. The AUROCs of CTP, MELD, and MELDNa at 12 mo were 0.72, 0.75 and 0.84, respectively. In cirrhotic patients with bleeding, the AUROCs of CTP and MELD were 0.76 and 0.88, *** MESO has the highest AUROC in all assessed scoring systems. Considering the different time points, MELDNa has good accuracy in predicting the mortality of decompensated liver cirrhosis. Compared to CTP, MELD is better in predicting variceal bleeding.

关键词： Liver cirrhosis Decompensated Mortality Accuracy Meta-analysis

Bootstrap Test for Stationarity of Heavy-Tailed Series with Structural Breaks

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Journal of Mathematical Research and Exposition 2010年第6期30卷 1015-1022页

作者： Rui Bing QIN zheng tian Department of Applied Mathematics Northwestern Polytechnical UniversityShaanxi 710072P.R.China State Key Laboratory of Remote Sensing Science Beijing 100101P.R.China

The paper proposes a statistic to test stationarity of series with κ-stable innovations and structural breaks,obtains the asymptotical distribution of the statistic,and proves the consistency of the *** obtain critic values for the test without the estimation of the index κ,the paper proposes the bootstrap procedures to approximate the distribution,and proves the consistency of the *** simulations demonstrate that the bootstrap test is practical and powerful.

关键词： κ stable innovations structural breaks stationarity Heavy tails bootstrap.