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Physiological Mechanism of High and Stable Yield of No-tillage Cast-transplanted Rice

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Agricultural sciences in china 2002年第4期1卷 404-409页

作者： LIU Jun, HUANG Qing, FU Hua, LU Xiu-ming, LIU Huai-zhen and LI Kang-huo( Rice Research Institute , guangdong academy of Agricultural sciences , guangzhou 510640 , P.R. china) Rice Research Institute Guangdong Academy of Agricultural Sciences Guangzhou 510640 P. R . China

Four years' successive comparative experiments showed that no-tillage cast-transplanted rice (NTCTR), compared with conventional tillage cast-transplanted rice (CK), grew slower and produced less tillers at the early growing stage; but, it had shorter ineffective tillering time, less nutrition consumption, stronger individual growth and more uniform growth between individuals and the colony. These characteristics contribute to the increase not only in the productive tiller percentage but also in the ear quality. Furthermore, the flag leaf of NTCTR had higher photosynthetic rate during the filling stage and no early senescence phenomenon at the late stage, which facilitated the accumulation and the transportation of carbohydrates and improved grain setting rate.

关键词： Rice No-tillage cast-transplanted rice(NTCTR) Physiology

Expression pattern of antibacterial genes in the Musca domestica

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Science china(Life sciences) 2009年第9期52卷 823-830页

作者： WANG Yan1,JIN XiaoBao1,ZHU JiaYong1,ZENG AiHua2,CHU FuJiang1,YANG XiaoRong1 & MA Yan1 1 Institute of Pathogen Biology and Department of Pathogen Biology,guangdong Pharmaceutical University,guangzhou 510006,china 2 Department of Pharmacology,guangdong Pharmaceutical University,guangzhou 510006,china Institute of Pathogen Biology and Department of Pathogen Biology Guangdong Pharmaceutical University Guangzhou 510006 China Department of Pharmacology Guangdong Pharmaceutical University Guangzhou 510006 China

This work studied the transcriptional patterns of three antibacterial genes,attacin,defensin and cecropin,during the development of Musca domestica. Quantitative analysis by real-time PCR was performed on mRNA levels in different development stages and challenged 3rd-instar larva at different time points after challenge of Musca domestica. The results revealed a predominance of the transcripts of all three genes during the 3rd-instar larvae and the adults. In the meanwhile,it revealed the greatest increase in mRNA. The transcript levels increased to 801 times,1009 times and 2500 times respectively for cecropin,attacin and defensin in 3rd-instar larvae after challenging susceptible bacterium. The results suggested that the transcriptional patterns of Musca domestica antibacterial genes were different during the different growth stages as well as the microbial challenge encountered in 3rd-instar larvae.

关键词： Musca domestica expression pattern attacin defensin cecropin

Antiangiogenic therapy:a novel approach to overcome tumor hypoxia

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Chinese Journal of Cancer 2010年第8期29卷 715-720页

作者： Fang Peng1,2, Ming Chen1,2 1 State Key Laboratory of Oncology in South china, guangzhou, guangdong 510060, P. R. china 2 Department of Radiation Oncology, Sun Yat-sen University Cancer Center, guangzhou, guangdong 510060, P. R. china Department of Radiation Oncology Sun Yat-sen University Cancer Center State Key Laboratory of Oncology in South China Guangdong Guangzhou 510060

Hypoxia is a common phenomenon in solid tumors. Resistance of hypoxic tumor cells to radiation is a significant reason of failure in the local control of tumors. The growth and metastasis of solid tumors rely on blood vessels. Antiangiogenic agents mainly target tumor blood vessels, and radiation therapy mainly targets tumor cells. Combination of antiangiogenic treatment and radiation exhibits synergistic effect, which improves the response of tumors to radiation therapy. The mechanisms of interaction between antiangiogenic agents and ionizing radiation are complex and involve interactions between tumor cells and tumor microenvironment, including tumor oxygenation, stroma, and vasculature. The original mechanism of antiangiogenesis is to induce ischemia and hypoxia in tumors, thereby, "starve" the tumors. However, recently, emerging data suggest that antiangiogenic agents could reduce the proportion of hypoxic cells through normalizing tumor vasculature, decreasing oxygen consumption, and other mechanisms. The use of antiangiogenic agents provides a new approach to overcome the hypoxia problem, and ultimately improves the efficacy of radiation therapy. In this review, we discuss tumor hypoxia, tumor angiogenesis and its regulation, mechanisms of antiangiogenic therapy combined with radiation therapy, and how antiangiogenic therapy overcomes tumor hypoxia.

关键词：抗血管生成肿瘤细胞抗缺氧疗法放射治疗电离辐射肿瘤血管生成相互作用

Periodic blow-up solutions and their limit forms for the generalized Camassa-Holm equation

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Progress in Natural Science:Materials International 2008年第3期18卷 259-266页

作者： Zhengrong Liu a, Boling Guob a School of Mathematical sciences, South china University of Technology, guangzhou 510640, china b Institute of Applied Physics and Computational Mathematics, Beijing 100088, china School of Mathematical sciences South China University of Technology Guangzhou 510640 China Institute of Applied Physics and Computational Mathematics Beijing 100088 China

In this paper, we consider the generalized Camassa-Holm equation ut+2kux-uxxt+ au~2ux=2uxuxx+uuxxxUnder substitution ξ=x-ct, some new explicit periodic wave solutions and their limit forms are presented through some special phase orbits. These periodic wave solutions tend to infinity on ξ-u plane periodically. Thus we call them periodic blow-up solutions. To our knowledge, such periodic blow-up solutions have not been found in any other equations.

关键词： Generalized Camassa–Holm equation Explicit solutions Periodic blow-up

Microwave peak absorption frequency of liquid

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Science china(Physics,Mechanics & Astronomy) 2008年第9期51卷 1254-1263页

作者： HAN GuangZe1 & CHEN MingDong2 1 Department of Physics,South china University of Technology,guangzhou 510640,china 2 guangzhou Auto College,South china University of Technology,guangzhou 510800,china 1. Department of Physics South China University of Technology Guangzhou 510640 China 2. guangzhou Auto College South China University of Technology Guangzhou 510800 China

Microwave-assisted extraction is a new effective method which has practical ap-plications in many fields. Microwave heating is one of its physical mechanisms,and it also has the characteristic of selectivity. When the applied microwave fre-quency equals a certain absorption frequency of the material (or specific compo-nent),the material will intensively absorb microwave energy. This is also known as resonant absorption,and the frequency is called the peak absorption frequency which depends on the physical structure of the material. In this work,dynamic hy-drogen bond energy was included in molecular activation energy; with the liquid cell model,the expression of interaction energy between dipolar molecules was derived. The rotational relaxation time was gotten from the Eyring viscosity formula. Then based on the relationship between dielectric dissipation coefficient and re-laxation time,the expression of microwave peak absorption frequency as a func-tion of the material physical structure,rotational inertia and electrical dipole mo-ment of molecules was established. These theoretical formulas were applied to water and benzene,and the calculated results agree fairly well with the experi-mental data. This work can not only deepen the study of the interaction between microwave and material,but also provide a possible guide for the experiment of microwave-assisted extraction.

关键词： microwave-assisted extraction microwave heating relaxation time liquid viscosity peak absorption fre-quency

A provable secure fuzzy identity based signature scheme

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Science china(Information sciences) 2012年第9期55卷 2139-2148页

作者： WANG ChangJi 1,2 1 School of Information Science and Technology,Sun Yat-sen University,guangzhou 510275,china 2 guangdong Province Information Security Key Laboratory,Sun Yat-sen University,guangzhou 510275,china 1. School of Information Science and Technology Sun Yat-sen University Guangzhou 510275 China2. Guangdong Province Information Security Key Laboratory Sun Yat-sen University Guangzhou 510275 China

To use biometrics identities in an identity based encryption system,Sahai and Waters first introduced the notion of fuzzy identity based encryption(FIBE) in *** et *** it to digital signature and introduced the concept of fuzzy identity based signature(FIBS) in 2008,and constructed an FIBS scheme based on Sahai and Waters's FIBE *** this paper,we further formalize the notion and security model of FIBS scheme and propose a new construction of FIBS scheme based on bilinear *** proposed scheme not only provides shorter public parameters,private key and signature,but also have useful structures which result in more efficient verification than that of Yang et al.'s FIBS *** proposed FIBS scheme is proved to be existentially unforgeable under a chosen message attack and selective fuzzy identity attack in the random oracle model under the discrete logarithm assumption.

关键词： identity based cryptosystem fuzzy identity based encryption fuzzy identity based signature

Optimal land use allocation of urban fringe in guangzhou

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Journal of Geographical sciences 2012年第1期22卷 179-191页

作者： GONG Jianzhou LIU Yansui CHEN Wenli Institute of Geographic sciences and Natural Resources Research CAS School of Geographical sciences Guangzhou University guangdong Party Institute of CCP guangdong Administration Institute

In response to the strong drive for social and economic development, local governments have implemented urban master plans, providing measures and timeframes to address the continuous demand for land and to alleviate urban problems. In this paper, a multi-objective model was constructed to discuss the problem, including economic benefits and ecological effectiveness, in terms of land use optimization. A genetic algorithm was then adopted to solve the model, and a performance evaluation and sensitivity analysis were conducted using Pareto optimality. Results showed that a set of tradeoffs could be acquired by the allocation of land use. In addition, the Pareto solutions proved the model to be efficient; for example, a limit of 13,500 ha of urban area conformed to plan recommendations. The reduction in crop land, orchard land, grassland, and unused land provided further efficiencies. These results implied that further potential regional land resources remain and that the urban master plan is able to support sustainable local development in the years to come, as well as verified that it is feasible to use land use allocation multi-objective modeling and genetic algorithms.

关键词： optimal allocation land use multi-objective modeling genetic algorithms fringe area

Heterotetranuclear Cu_2~IPd_2~Ⅱ Complex with Bis(diphenylphosphino)methane and Diethyldithiocarbamate

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Chinese Journal of Structural Chemistry 2003年第4期22卷 435-438页

作者： SITU Yue HUANG Shao-Bin (Department of Applied Chemistry, South china University of Technology, guangzhou, guangdong 510640, china)

Self-assembly between the building blocks of Pd(Et2dtc)2 (Et2dtc = diethyldithio- carbamate) and [Cu2(m-dppm)2(MeCN)2]2+ (dppm = bis(diphenylphosphino)methane) gave a new heterotetranuclear complex [Cu2Pd2(m-dppm)2(m-Et2dtc)2(m3-Et2dtc)2](ClO4)2H2O (C70H86Cl2Cu2- N4O9P4Pd2S8, Mr = 1932.56), and its crystal structure has been determined by X-ray crystallo- graphy. It crystallizes in triclinic, space group P with a = 11.9834(6), b = 12.5624(6), c = 14.5603(8) ? a = 101.393 (1), b = 103.300 (1), g = 96.310(1), V = 2063.2(2) 3, Z = 1, Dc = 1.544 g/cm3, m(MoKa) = 1336 cm-1 and F(000) = 978. The total and unique reflections are 8710 and 5400, respectively. The structure was refined to R = 0.0860 and wR = 0.1996 for 3914 observed reflections with I > 2s(I). The title complex consists of the cation [Cu2Pd2(m-dppm)2(m-Et2dtc)2(m3- Et2dtc)2]2+, anion ClO4- and solvate H2O. The Pd(Ⅱ) atoms are located at the approximately square-planar environments with PS3 donors and the Cu(I) atoms display distorted tetrahedral geometries.

关键词： bis(diphenylphosphino)methane diethyldithiocarbamate copper crystal structure palladium

Decomposition in AHP with Application to Forecasting

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Systems Science and Systems Engineering 1996年第3期6卷 327-334页

作者： ZHANG Qiren(Systems Engineering Institute, guangdong University of Technology, guangzhou 510090, china)

Several approaches have been proposed to solve the problem existing in ANALYTIC HIERARCHY PROCESS (AHP) as the number of alternatives in one level is sometimes much larger than nine. A new method in terms of decomposition procedure is proposed in this paper. Case study shows that my procedure proposed here is effective and straightforward.

关键词： Decomposition Incomplete Forecasting