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A New ent-Kaurane type Diterpenoid Glycoside from Inula japonica Thunb
Jiang Jiang Qin,Jia Xian Zhu,Wei Dong Zhang1,2,Yan Zhu,Jian Jun Fu,Xiao Hua Liu,Hui Zi Jin 대한약학회 2009 Archives of Pharmacal Research Vol.32 No.10
A new ent-kaurane type diterpenoid glycoside, 17-O-β-D-glucopyranosyl-16α-ent-kauran-19-oic acid (1), together with 17-hydroxy-16α-ent-kauran-19-oic acid (2), 16α,17-dihydroxyl-ent-kauran-19-oic acid (3), and 16α-hydroxy-17-acetoxy-ent- kauran-19-oic acid (4) were isolated from the aerial parts of Inula japonica Thunb. The structure of 1 was determined mainly by use of 1D and 2D NMR spectroscopic techniques including HSQC, 1H-1H COSY, HMBC, and NOESY. In addition, 4 exhibited significant inhibitory activity on NO production in LPS-stimulated RAW264.7 cells with IC50 value of 14.3 μg/mL.
Fu, Qiang,Wang, Bai-Chen,Jin, Xiang,Li, Hong-Bing,Han, Pei,Wei, Kai-Hua,Zhang, Xue-Min,Zhu, Yu-Xian Korean Society for Biochemistry and Molecular Biol 2005 Journal of biochemistry and molecular biology Vol.38 No.6
Proteins accumulated in dry, stratified Arabidopsis seeds or young seedlings, totaled 1100 to 1300 depending on the time of sampling, were analyzed by using immobilized pH gradient 2-DE gel electrophoresis. The molecular identities of 437 polypeptides, encoded by 355 independent genes, were determined by MALDI-TOF or TOF-TOF mass spectrometry. In the sum, 293 were present at all stages and 95 were accumulated during the time of radicle protrusion while another 18 appeared in later stages. Further analysis showed that 226 of the identified polypeptides could be located in different metabolic pathways. Proteins involved in carbohydrate, energy and amino acid metabolism constituted to about 1/4, and those involved in metabolism of vitamins and cofactors constituted for about 3% of the total signal intensity in gels prepared from 72 h seedlings. Enzymes related to genetic information processing increased very quickly during early imbibition and reached highest level around 30 h of germination.
Study of the flow around a cylinder from the subcritical to supercritical regimes
Zhang, Xian-Tao,Li, Zhi-Yu,Fu, Shi-Xiao,Ong, Muk Chen,Chen, Ying Techno-Press 2014 Ocean systems engineering Vol.4 No.3
The objective of the present simulations is to evaluate the applicability of the standard $k-{\varepsilon}$ turbulence model in engineering practice in the subcritical to supercritical flow regimes. Two-dimensional numerical simulations of flow around a circular cylinder at $Re=1{\times}10^5$, $5{\times}10^5$ and $1{\times}10^6$, had been performed using Unsteady Reynolds-Averaged Navier Stokes (URANS) equations with the standard $k-{\varepsilon}$ turbulence model. Solution verification had been studied by evaluating grid and time step size convergence. For each Reynolds number, several meshes with different grid and time step size resolutions were chosen to calculate the hydrodynamic quantities such as the time-averaged drag coefficient, root-mean square value of lift coefficient, Strouhal number, the coefficient of pressure on the downstream point of the cylinder, the separation angle. By comparing the values of these quantities of adjacent grid or time step size resolutions, convergence study has been performed. Solution validation is obtained by comparing the converged results with published numerical and experimental data. The deviations of the values of present simulated quantities from those corresponding experimental data become smaller as Reynolds numbers increases from $1{\times}10^5$ to $1{\times}10^6$. This may show that the standard $k-{\varepsilon}$ model with enhanced wall treatment appears to be applicable for higher Reynolds number turbulence flow.
Physics Parameters and Design Study for the Beijing Spallation Neutron Source
Shou-Xian Fang,C. Zhang,J. Wei,J.Y. Tang,Q. Qin,S. Wang,S.N. Fu 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.4
The Beijing Spallation Neutron Source (BSNS) will be the next large science facility in China. Based on an 80 MeV linac and a 1.6 GeV rapid cycling synchrotron, the BSNS has a goal to obtain a proton beam power of 100 kW with a repetition rate of 25 Hz in the first phase. An introduction to the conceptual design of the BSNS is given, and the main parameters and key technical features are summarized. The R&D plan is discussed.뒩b
Yan Lv,Xian-Guo Guo,Dao-chao Jin,Wen-Yu Song,Rong Fan,Cheng-Fu Zhao,Zhi-Wei Zhang,Ke-Yu Mao,Yun-Ji Zou,Zhi-Hua Yang 대한기생충학ㆍ열대의학회 2020 The Korean Journal of Parasitology Vol.58 No.2
The chigger mite Leptotrombidium sialkotense is one of the 6 main vectors of scrub typhus in China. Before present study, L. sialkotense was found in some parts of Hunan province, China with a narrow geographical distribution. During field investigation 2016-2017, we found L. sialkotense in Jingha, southern Yunnan, China. Of 15 small mammal host species, L. sialkotense were collected from 6 species of the hosts. Rattus brunneusculus was a dominant host of L. sialkotense, from which 98.3% of the mites were collected. The chigger mite showed a relatively high infestation prevalence (PM=11.7%) and mean abundance (MA=0.5) in comparison with the rest 5 host species. These results reveal a certain host specificity of L. sialkotense to a rat R. brunneusculus. The mite L. sialkotense showed an aggregated distribution on the host (P<0.05). A positive correlation observed between L. sialkotense and the body length of hosts. There was a positive interspecific association between L. sialkotense and 2 other dominant vectors, L. deliense and L. scutellare.
Fei Zhu,Xian-Fu Zhang,Hanfeng Li 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.9
In this paper, the technique of static gain as a new research approach is applied in the nonlinear triangular systems to investigate the issue of actuator fault. By employing the static gain technique, the nonlinear lowertriangular systems are converted into the form which is easy to find its Lyapunov function. The fault parameters of the actuator are subsequently processed by the efficient adaptive estimation tactic, after that, the goal of guaranteeing the global boundness of all closed-loop signals can be achieved by utilizing a state controller with the hyperbolicfunctions. Moreover, by adopting the same strategy, the actuator failure compensation problem is also solved for the nonlinear upper-triangular systems. Last but not least, the effectiveness of the design scheme is verified by two numerical simulation examples.
Robustness Analysis for Switched Multiple Equilibrium Points Systems
Zhi Liu,Xian-Fu Zhang,Yuzhen Wang 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.6
This article investigates the robustness of switched multiple equilibrium points systems (SMEPSs) withunstable subsystems. Each subsystem has a unique equilibrium point that is different from all equilibrium pointsof the other subsystems. Unlike the most commonly used Lyapunov function method, the analytical solutions andnumerical solutions are calculated to analyze the boundedness of the solutions for perturbation discrete-time andcontinuons-time SMEPSs, respectively. The given perturbation systems have good robustness if the ratio of totaldwell time of unstable subsystems and the total dwell time of stable subsystems is less than or equal to a constant. A numerical example is employed to validate the correctness of the theoretical results.
Yan-Ling Chen,Xian-Guo Guo,Wen-Yu Song,Tian-Guang Ren,Lei Zhang,Rong Fan,Cheng-Fu Zhao,Zhi-Wei Zhang,Wenge Dong,Xiao-Bin Huang,Dao-chao Jin 대한기생충학ㆍ열대의학회 2023 The Korean Journal of Parasitology Vol.61 No.3
Chigger mites are the vector of scrub typhus. This study estimates the infestation status and ecological characteristics of chiggers on the chestnut white-bellied rat Niviventer fulvescens in Southwest China between 2001 and 2019. Chiggers were identified under the microscope, and infestation indices were calculated. The Preston’s log-normal model was used to fit the curve of species abundance distribution. A total of 6,557 chiggers were collected in 136 of 342 N. fulvescens rats, showing high overall infestation indices (prevalence=39.8%, mean abundance=19.2, mean intensity=48.2) and high species diversity (S =100, H’=3.0). Leptotrombidium cangjiangense, Neotrombicula japonica, and Ascoschoengastia sifanga were the three dominant chigger species (constituent ratio=42.9%; 2,736/6,384) and exhibited an aggregated distribution among different rat individuals. We identified 100 chigger species, with 3 of them (Leptotrombidium scutellare, Leptotrombidium wenense, and Leptotrombidium deliense) as the main vectors of scrub typhus in China and nine species as potential vectors of this disease. Disease vector occurrence on N. fulvescens may increase the risk of spreading scrub typhus from rats to humans. Chigger infestation on N. fulvescens varied significantly in different environments. The species abundance distribution showed a log-normal distribution pattern. The estimated number of chigger species on N. fulvescens was 126 species.