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Search Results: 1 - 10 of 99751 matches for " Quan Zhong Liu "
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The Effect of Gynostemma pentaphyllum Extract on Mouse Dermal Fibroblasts
Sara Nadia Lobo,Yu Qing Qi,Quan Zhong Liu
ISRN Dermatology , 2014, DOI: 10.1155/2014/202876
Abstract: Background. The objective of this paper is to demonstrate the effect of Gynostemma pentaphyllum extract on mouse dermal fibroblasts. Recent studies have shown that this plant may possess great antioxidant properties, which can be very beneficial in combating oxidative stress. Methods. Gynostemma pentaphyllum extract was prepared and mouse dermal fibroblasts were obtained and cultured as per our laboratory protocols. Twelve samples of cells were cultured under the same conditions and both negative and positive controls were established. Induction of oxidative stress was carried out using ultraviolet C (UVC) light. Viable cell count was carried out, using microscopy. The analysis of the overall results was processed using SPSS version 16.0. Results. Statistical analysis showed strong positive correlation between the concentration of Gynostemma pentaphyllum and the mean duration of cell viability (rs?=?1), with a high level of statistical significance ( ). Likewise, strong positive correlation existed between trials of cell viability (rs?=?0.988–1), with statistical significance ( ). Conclusion. Gynostemma pentaphyllum extract prolongs viability of mouse dermal fibroblasts damaged by UVC light-induced oxidative stress. The results show the potential benefits of this extract on dermal cell aging. 1. Introduction The retardation and control of skin aging constitute one of the biggest challenges faced by researchers and scientists in the area of cosmetology. This area of study is continuously researched, due to the unending pursuit of maintenance of youthfulness and appearance. Many scientific investigations are currently underway, as the field of cosmeceutical development widens. New studies are revealing the truth about many agents that modify the process of skin aging. The future incorporation of these studies into clinical practice would change the way that this process is currently managed. Many plant extracts play a vital role in the modification of skin aging. Some of these have been thoroughly investigated, whereas others have only been used empirically for centuries. Gynostemma pentaphyllum, commonly referred to as “Jiaogulan” in China, is one of the many examples of these plants [1, 2]. This plant is normally grown in the mountainous regions of China and is considered a vine because of its growth pattern. It has been used for centuries as a traditional remedy for respiratory and toxic conditions and has also been associated with longevity, among other benefits [1, 2]. Many studies have been done to verify some of the many beliefs associated with the
Resonant states and pseudospin symmetry in the Dirac Morse potential
Quan Liu,Zhong-Ming Niu,Jian-You Guo
Physics , 2013, DOI: 10.1103/PhysRevA.87.052122
Abstract: The complex scaling method is applied to study the resonances of a Dirac particle in a Morse potential. The applicability of the method is demonstrated with the results compared with the available data. It is shown that the present calculations in the nonrelativistic limit are in excellent agreement with the nonrelativistic calculations. Further, the dependence of the resonant parameters on the shape of the potential is checked, and the unusual sensitivity to the potential parameters is revealed. By comparing the energies and widths of the pseudospin doublets, well pseudospin symmetry is discovered in the present model. The relationship between the pseudospin symmetry and the shape of the potential is investigated by changing the Morse potential shaped by the dissociation energy, the equilibrium intermolecular distance, and the positive number controlling the decay length of the potential.
Dynamics of neutrino-driven winds: inclusion of accurate weak interaction rates in strong magnetic fields
Men-Quan Liu,Zhong-Xiang Wang
Physics , 2012, DOI: 10.1088/1674-4527/13/2/007
Abstract: Solving Newtonian steady-state wind equations with accurate weak interaction rates and magnetic fields (MFs) of young neutron stars considered, we study the dynamics and nucleosynthesis of neutrino-driven winds (NDWs) from proto neutron stars (PNSs). For a typical 1.4 M$_{\odot}$ PNS model, we find the nucleosynthesis products are closely related to the luminosity of neutrinos and anti-neutrinos. The lower the luminosity is, the larger effect to the NDWs caused by weak interactions and MFs is. At a high anti-neutrino luminosity of typically $8\times 10^{51}$ erg s$^{-1}$, neutrinos and anti-neutrinos dominate the processes in a NDW and the MFs hardly change the wind's properties. While at a low anti-neutrino luminosity of $10^{51}$ erg s$^{-1}$ at the late stage of a NDW, the mass of product and nucleosynthesis are changed significantly in the strong MFs, they are less important than those in the early stage when the anti-neutrino luminosity is high. Therefore for the most models considered for the NDWs from PNSs, based on our calculations the influences of MFs and the net weak interactions on the nucleosynthesis is not significant.
Mechanical analysis of a $β=0.09 $ 162.5MHz taper HWR cavity
Peiliang Fan,Feng Zhu,Hutianxiang Zhong,Shengwen Quan,Kexin Liu
Physics , 2015,
Abstract: One superconducting taper-type half-wave resonator (HWR) with frequency of 162.5MHz, \b{eta} of 0.09 has been developed at Peking University, which is used to accelerate high current proton ($\sim$ 100mA) and $D^{+}$($\sim$ 50mA). The radio frequency (RF) design of the cavity has been accomplished. Herein, we present the mechanical analysis of the cavity which is also an important aspect in superconducting cavity design. The frequency shift caused by bath helium pressure and Lorenz force, and the tuning by deforming the cavity along the beam axis will be analyzed in this paper.
Phylogenetic Relationships of Cervinae Based on Sequence of Mitochondrial Cytochrome b Gene
从Cyt b基因序列探讨鹿亚科动物的系统发生关系

LIU Xiang hua,WANG Yi quan,LIU Zhong quan,Zhou Kai ya,
刘向华
,王义权

动物学研究 , 2003,
Abstract: 鹿亚科共有4个属,各属间和属内特别是鹿属内的系统进化关系存在疑义。根据Cyt b基因序列分析,探讨了鹿亚科及中国鹿属、马鹿亚种的进化关系。结果分析表明:现行分类系统中,斑鹿属可能并非单系发生,暗示应将豚鹿并入鹿属;麋鹿属与鹿属有较近的进化关系,也应并入鹿属;黄占鹿属的进化地位有待进一步研究;归并后的鹿属为单系发生。中国马鹿各亚种在系统发生上是一单系群,其中马鹿天山亚种和阿尔泰亚种聚为最原始的一支。
Numerical observation of non-axisymmetric vesicles in fluid membranes
Yan Jie,Liu Quan-Hui,Liu Ji-Xing,Ou-Yang Zhong-Can
Physics , 1998, DOI: 10.1103/PhysRevE.58.4730
Abstract: By means of Surface Evolver (Exp. Math,1,141 1992), a software package of brute-force energy minimization over a triangulated surface developed by the geometry center of University of Minnesota, we have numerically searched the non-axisymmetric shapes under the Helfrich spontaneous curvature (SC) energy model. We show for the first time there are abundant mechanically stable non-axisymmetric vesicles in SC model, including regular ones with intrinsic geometric symmetry and complex irregular ones. We report in this paper several interesting shapes including a corniculate shape with six corns, a quadri-concave shape, a shape resembling sickle cells, and a shape resembling acanthocytes. As far as we know, these shapes have not been theoretically obtained by any curvature model before. In addition, the role of the spontaneous curvature in the formation of irregular crenated vesicles has been studied. The results shows a positive spontaneous curvature may be a necessary condition to keep an irregular crenated shape being mechanically stable.
Capture on High Curvature Region: Aggregation of Colloidal Particle Bound to Giant Phospholipid Vesicles
Quan-Hui Liu,Ji-Xing Liu,Ou-Yang Zhong-Can
Physics , 1999, DOI: 10.1142/S0217984999000713
Abstract: A very recent observation on the membrane mediated attraction and ordered aggregation of colloidal particles bound to giant phospholipid vesicles (I. Koltover, J. O. R\"{a}dler, C. R. Safinya, Phys. Rev. Lett. {\bf 82}, 1991(1999)) is investigated theoretically within the frame of Helfrich curvature elasticity theory of lipid bilayer fluid membrane. Since the concave or waist regions of the vesicle possess the highest local bending energy density, the aggregation of colloidal beads on these places can reduce the elastic energy in maximum. Our calculation shows that a bead in the concave region lowers its energy $\sim 20 k_B T$. For an axisymmetrical dumbbell vesicle, the local curvature energy density along the waist is equally of maximum, the beads can thus be distributed freely with varying separation distance.
Spheres and Prolate and Oblate Ellipsoids from an Analytical Solution of Spontaneous Curvature Fluid Membrane Model
Quan-Hui Liu,Zhou Haijun,Ji-Xing Liu,Ou-Yang Zhong-Can
Physics , 1999, DOI: 10.1103/PhysRevE.60.3227
Abstract: An analytic solution for Helfrich spontaneous curvature membrane model (H. Naito, M.Okuda and Ou-Yang Zhong-Can, Phys. Rev. E {\bf 48}, 2304 (1993); {\bf 54}, 2816 (1996)), which has a conspicuous feature of representing the circular biconcave shape, is studied. Results show that the solution in fact describes a family of shapes, which can be classified as: i) the flat plane (trivial case), ii) the sphere, iii) the prolate ellipsoid, iv) the capped cylinder, v) the oblate ellipsoid, vi) the circular biconcave shape, vii) the self-intersecting inverted circular biconcave shape, and viii) the self-intersecting nodoidlike cylinder. Among the closed shapes (ii)-(vii), a circular biconcave shape is the one with the minimum of local curvature energy.
Classifying data streams by stacking ensemble
基于堆叠集成的数据流分类*

LIANG Chun-quan,ZHANG Yang,LIU Quan-zhong,
梁春泉
,张阳,刘全中

计算机应用研究 , 2009,
Abstract: Ensemble learning is a general method for classifying data streams. In order to get a better classification, this paper proposed a general framework for classifying data streams by stacking ensemble. Built another classifier to combine base classifiers. Experiments show that comparing majority vote or weight vote ensemble classifiers, stacking ensemble classifiers has stronger ability in adapting to concept drifting and higher accuracy.
Normal Mouse Intestinal Epithelial Cells as a Model for the in vitro Invasion of Trichinella spiralis Infective Larvae
Hui Jun Ren, Jing Cui, Zhong Quan Wang, Ruo Dan Liu
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0027010
Abstract: It has been known for many years that Trichinella spiralis initiates infection by penetrating the columnar epithelium of the small intestine; however, the mechanisms used by the parasite in the establishment of its intramulticellular niche in the intestine are unknown. Although the previous observations indicated that invasion also occurs in vitro when the infective larvae are inoculated onto cultures of intestinal epithelial cells (e.g., human colonic carcinoma cell line Caco-2, HCT-8), a normal readily manipulated in vitro model has not been established because of difficulties in the culture of primary intestinal epithelial cells (IECs). In this study, we described a normal intestinal epithelial model in which T. spiralis infective larvae were shown to invade the monolayers of normal mouse IECs in vitro. The IECs derived from intestinal crypts of fetal mouse small intestine had the ability to proliferate continuously and express specific cytokeratins as well as intestinal functional cell markers. Furthermore, they were susceptible to invasion by T. spiralis. When inoculated onto the IEC monolayer, infective larvae penetrated cells and migrated through them, leaving trails of damaged cells heavily loaded with T. spiralis larval excretory-secretory (ES) antigens which were recognized by rabbit immune sera on immunofluorescence test. The normal intestinal epithelial model of invasion mimicking the natural environment in vivo will help us to further investigate the process as well as the mechanisms by which T. spiralis establishes its intestinal niche.
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