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Changes in muscular strength and electromyogram in rats with muscular disuse atrophy following electrical stimulation

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Neural Regeneration Research 2006年第9期1卷 809-812页

作者： Xiaoyu Lü1, Xuanming Hao2 1Department of Rehabilitation and Physiotherapy, guangzhou General Hospital of guangzhou Military Area Command of Chinese PLA, guangzhou 510010, guangdong province, china 2college of sports science, south china normal university, guangzhou 510631, guangdong province, china Department of Rehabilitation and Physiotherapy Guangzhou General Hospital Guangzhou Military Area Command Guangzhou 510010 Guangdong Province China college of sports science South China Normal University Guangzhou 510631 Guangdong Province China

BACKGROUND: Atrophy of skeletal muscle is found under the condition of muscular disuse or in the process of fixation. It is affected by fixation, and electromyogram (EMG) discharge and muscular strength levels will be significantly decreased with accelerating tendency. Electrical stimulation (ES) therapy can release the velocity of muscular disuse atrophy effectively, so it is an effective method for preventing and treating muscular disuse atrophy and accelerating rehabilitation velocity following removal of fixation. OBJECTIVE: To observe the effect of ES therapy at different time points following the fixation of rat models of muscular disuse atrophy on muscular strength and EMG of quadriceps femoris. DESIGN: A randomized and controlled animal experiment. SETTING: Department of Rehabilitation and Physiotherapy, guangzhou General Hospital of guangzhou Military Area Command of Chinese PLA; college of sports science, south china normal university. MATERIALS: Male SD rats, of clean grade, aged 4 months old, weighing (230±10) g, were provided by the Animal Experimental Center of Sun Yat-sen university. EMG measurement and analysis system (NEC Company, Japan) and four-channel recorder (NEC Company, Japan) were used in this experiment. METHODS: This experiment was carried out in the Laboratory of Human sports science, south china normal university between September 2003 and March 2004. Totally 125 successful SD rat models of muscular disuse atrophy were randomly divided into 5 groups with 25 rats in each by a lot: normal control group, in which, the rats were untouched; ES 24 hours, 1, 2 and 3 weeks groups: the knees of rats in these four groups were fixed. Rats in four groups underwent ES therapy at 24 hours, 1, 2 and 3 weeks after fixation. T90-Ⅱ computer ES muscular strength training instrument was used in ES therapy every other day. The instrument was set as square wave, 5 mA current intensity and 10 minutes a day. Muscular strength of quadriceps femoris and data of E

关键词： electrical stimulation disuse atrophy velocity of strength training animal experiment skeletal muscle used in strength of SD rat

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A problem of complex oscillation for homogeneous linear differential equations

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Chinese science Bulletin 1998年第20期43卷 1709-1712页

作者： GAO Shian and YANG Ronghua Department of Mathematics,south china normal university,guangzhou 510631, china Department of Mathematics, guangdong Educational college, guangzhou 510303, china Department of Mathematics South China Normal University Guangzhou China Department of Mathematics Guangdong Educational College Guangzhou China

Under a combined dominant condition, an open problem of complex oscillation for the equation \%w (k) +Aw=0\% is set, where \%k≥3, a(z)\% is a transcendental entire function.

关键词： meromorphic function differential equation complex oscillation.

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A note for preconditioning nonsymmetric matrices

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Applied Mathematics(A Journal of Chinese Universities) 2010年第1期25卷 93-100页

作者： CHEN Xiao-shan LI Wen School of Mathematics, south china normal university, guangzhou 510631, china School of Mathematics South China Normal University Guangzhou China

In this paper, we consider preconditioners for generalized saddle point systems with a nonsymmetric coefficient matrix. A constraint preconditioner for this systems is constructed, and some spectral properties of the ... 详细信息

关键词： Preconditioner saddle point matrix minimal polynomial Schilder's factorization.

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Optical pulse compression using a nonlinear optical loop mirror constructed from dispersion decreasing fiber

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science china(Technological sciences) 2004年第1期47卷 33-50页

作者： CAO Wenhua & LIU SonghaoSchool of Information, Wuyi university, Jiangmen 529020, china School for Information and Optoelectronic science and Engineering, south china normal university, guangzhou 510631, china 1. School of Information Wuyi University 529020 Jiangmen China 2. School for Information and Optoelectronic science and Engineering South China Normal University 510631 Guangzhou China

A novel scheme to compress optical pulses is proposed and demonstrated numerically, which is based on a nonlinear optical loop mirror constructed from dispersion decreasing fiber (DDF). We show that, in contrast to the conventional soliton-effect pulse compression in which compressed pulses are always accompanied by pedestals and frequency chirps owning to nonlinear effects, the proposed scheme can completely suppress pulse pedestals and frequency chirps. Unlike the adiabatic compression technique in which DDF length must increase exponentially with input pulsewidth, the proposed scheme does not require adiabatic condition and therefore can be used to compress long pulses by using reasonable fiber lengths. For input pulses with peak powers higher than a threshold value, the compressed pulses can propagate like fundamental solitons. Furthermore, the scheme is fairly insensitive to small variations in the loop length and is more robust to higher-order nonlinear effects and initial frequency chirps than the adiabatic compression technique.

关键词： dispersion decreasing fiber (DDF), optical pulse compression, optical solitons.

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Imaging theory of nonlinear second harmonic and third harmonic generations in confocal microscopy

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science china(Physics,Mechanics & Astronomy) 2004年第1期47卷 8-16页

作者： TANG Zhilie1, XING Da2 & LIU Songhao2 1. Department of Physics, south china normal university, guangzhou 510631, china 2. School for Information and Optoelectronic science and Engineering, south china normal university, guangzhou 510631, china Correspondence should be addressed to Tang Zhilie (email: tangzhl@***) Received April 23, 2003 1. Department of Physics South China Normal University 510631 Guangzhou China 2. School for Information and Optoelectronic science and Engineering South China Normal University 510631 Guangzhou China

The imaging theory of nonlinear second harmonic generation (SHG) and third harmonic generation (THG) in confocal microscopy is presented in this paper. The nonlinear effect of SHG and THG on the imaging properties of confocal microscopy has been analyzed in detail by the imaging theory. It is proved that the imaging process of SHG and THG in confocal microscopy, which is different from conventional coherent imaging or incoherent imaging, can be divided into two different processes of coherent imaging. The three-dimensional point spread functions (3D-PSF) of SHG and THG confocal microscopy are derived based on the nonlinear principles of SHG and THG. The imaging properties of SHG and THG confocal microscopy are discussed in detail according to its 3D-PSF. It is shown that the resolution of SHG and THG confocal microscopy is higher than that of single- and two-photon confocal microscopy.

关键词： second harmonic generation, third harmonic generation, confocal microscopy, three-dimensional point spread function.

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On the diophantine equation X^2-(1+a^2)Y^4 =-2a

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science china Mathematics 2010年第8期53卷 2143-2158页

作者： YUAN PingZhi 1 & ZHANG ZhongFeng 2 1 School of Mathematics,south china normal university,guangzhou 510631,china 2 School of Mathematics & Computational science,Sun Yat-Sen university,guangzhou 510275,china 1. School of Mathematics South China Normal University Guangzhou 510631 China2. School of Mathematics & Computational Science Sun Yat-Sen University Guangzhou 510275 China

Let a≥1 be an *** this paper,we will prove the equation in the title has at most three positive integer solutions.

关键词： algebraic approximations continued fractions elliptic curves quartic equations

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The counting series for (k+1)-uniform linear acyclic hypergraphs

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Chinese science Bulletin 2001年第3期46卷 197-200页

作者： SHAN Zhilong & LIU Bolian Department of Mathematics, south china normal university, guangzhou 510631, china Department of Computer science, Guandong Polytechnical normal university, guangzhou 510633, china Department of Mathematics South China Normal University Guangzhou China Department of Computer science Guandong Polytechnical Normal University Guangzhou China

The explicit formula for (k+l)-uniform linear acyclic hypergraphs and the counting series for unlabeled (k +1)-uniform linear acyclic hypergraphs are obtained.

关键词： hypergraph linear hypergraph hypertree bipartite tree Polya’s Enumeration Theorem.

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THE REGULARITY OF THE FREE BOUNDARY FOR STRIKE RESET OPTION

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Acta Mathematica Scientia 2010年第5期30卷 1721-1729页

作者：杨舟 School of Mathematical sciences South China Normal University

A strike reset option is an option that allows its holder to reset the strike price to the prevailing underlying asset price at a moment chosen by the holder. The pricing model of the option can be formulated as a parabolic variational inequality and the optimal reset strategy is the free boundary. The smoothness of the free boundary in some cases was showed in our article published in JDE. We would prove its smoothness in the other case in this paper by a generalized comparison principle for the variational inequality.

关键词： strike reset option free boundary variational inequality the comparison principle

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PRGL:A cell wall proline-rich protein containning GASA domain in Gerbera hybrida

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science china(Life sciences) 2008年第6期51卷 520-525页

作者： PENG JianZong, LAI LiuJing & WANG XiaoJing college of Life sciences, south china normal university, guangdong Provincial Key Lab of Biotechnology for Plant Development, guangzhou 510631, china 1. college of Life sciences South China Normal University Guangdong Provincial Key Lab of Biotechnology for Plant Development Guangzhou 510631 China

PRPs (proline-rich proteins) are a group of cell wall proteins characterized by their proline and hy- droproline-rich repetitive peptides. The expression of PRPs in plants is stimulated by wounding and environmental stress. GASA (gibberellic acid stimulated in Arabidopsis) proteins are small peptides sharing a 60 amino acid conserved C-terminal domain containing twelve invariant cysteine residues. Most of GASAs reported are localized to apoplasm or cell wall and their expression was regulated by gibberellins (GAs). It has been reported that, in French bean, these two proteins encoding by two distinct genes formed a two-component chitin-receptor involved in plant-pathogen interactions when plant was infected. We cloned a full-length cDNA of PRGL (proline-rich GASA-like) gene which encodes a protein containing both PRP and GASA-like domains. It is demonstrated that PRGL is a new protein with characteristics of PRP and GASA by analyzing its protein structure and gene expression.

关键词： cell wall protein proline-rich proteins (PRPs) gibberellic acid stimulated in Arabidopsis (GASA) proline-rich GASA-like (PRGL) Gerbera hybrida

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A priori error analysis of a discontinuous Galerkin approximation for a kind of compressible miscible displacement problems

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science china Mathematics 2010年第10期53卷 2679-2696页

作者： YANG JiMing1,& CHEN YanPing2 1college of science,Hunan Institute of Engineering,Xiangtan 411104,china 2School of Mathematical sciences,south china normal university,guangzhou 510631,china 1. college of science Hunan Institute of Engineering Xiangtan 411104 China2. School of Mathematical Sciences South China Normal University Guangzhou 510631 China

A kind of compressible miscible displacement problems which include molecular diffusion and dispersion in porous media are investigated.A symmetric interior penalty discontinuous Galerkin (SIPG) method is applied to the coupled system of flow and *** the induction hypotheses instead of the cut-off operator and the interpolation projection properties,a priori hp error estimates are *** error bounds in L2(H1) norm for concentration and in L∞(L2) norm for velocity are optimal in h and suboptimal in p with a loss of power 1/2.

关键词： a priori error discontinuous Galerkin compressible miscible displacement coupled system

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