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Search Results: 1 - 10 of 8702 matches for " Xiuwen Tan "
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Expression of HMGR in Lilu cattle tissues  [PDF]
Guifen Liu, Fachun Wan, Xiaomu Liu, Haijian Cheng, Xiuwen Tan, Enliang Song
Open Journal of Animal Sciences (OJAS) , 2012, DOI: 10.4236/ojas.2012.21007
Abstract: The 3-hydroxy-3-methylglutaryl-CoA reductase (HMGR ) is an essential enzyme in cholesterol biosynthesis. To study the expression of HMGR in adipose and muscle tissues, and some performance indexes of four age stages, twelve Lilu cattle were selected. The results indicated that the Lilu beef cattle have good production and slaughter performance. HMGR mRNA expression level in adipose was higher than in muscle, but the trend in adipose was the same as in muscle. HMGR mRNA expression is difference in adipose and muscle tissues suggesting this gene is expressed in a tissue-dependent manner in cattle. Understanding the causes of variation in HMGR gene expression may provide crucial information about cholesterol biosynthesis in Lilu beef cattle.
Solvability of Nonlinear Sequential Fractional Dynamical Systems with Damping  [PDF]
Cuie Xiao, Xiuwen Li
Journal of Applied Mathematics and Physics (JAMP) , 2017, DOI: 10.4236/jamp.2017.52027
Abstract:
In this paper, we are concerned with the solvability for a class of nonlinear sequential fractional dynamical systems with damping infinite dimensional spaces, which involves fractional Riemann-Liouville derivatives. The solutions of the dynamical systems are obtained by utilizing the method of Laplace transform technique and are based on the formula of the Laplace transform of the Mittag-Leffler function in two parameters. Next, we present the existence and uniqueness of solutions for nonlinear sequential fractional dynamical systems with damping by using fixed point theorems under some appropriate conditions.
Characterization of Four Type IV Pilin Homologues in Stigmatella aurantiaca DSM17044 by Heterologous Expression in Myxococcus xanthus
Zaigao Tan, Haoming Li, Hongwei Pan, Xiuwen Zhou, Xin Liu, Ningning Luo, Wei Hu, Yuezhong Li
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0075105
Abstract: As prokaryotic models for multicellular development, Stigmatella aurantiaca and Myxococcus xanthus share many similarities in terms of social behaviors, such as gliding motility. Our current understanding of myxobacterial grouped-cell motilities comes mainly from the research on M. xanthus, which shows that filamentous type IV pili (TFP), composed of type IV pilin (also called PilA protein) subunits, are the key apparatus for social motility (S-motility). However, little is known about the pilin protein in S. aurantiaca. We cloned and sequenced four genes (pilASa1~4) from S. aurantiaca DSM17044 that are homologous to pilAMx (pilA gene in M. xanthus DK1622). The homology and similarities among PilASa proteins and other myxobacterial homologues were systematically analyzed. To determine their potential biological functions, the four pilASa genes were expressed in M. xanthus DK10410 (ΔpilAMx), which did not restore S-motility on soft agar or EPS production to host cells. After further analysis of the motile behaviors in a methylcellulose solution, the M. xanthus strains were categorized into three types. YL6101, carrying pilASa1, and YL6104, carrying pilASa4, produced stable but unretractable surface pili; YL6102, carrying pilASa2, produced stable surface pili and exhibited reduced TFP-dependent motility in methylcellulose; YL6103, carrying pilASa3, produced unstable surface pili. Based on these findings, we propose that pilASa2 might be responsible for the type IV pilin production involved in group motility in S. aurantiaca DSM17044. After examining the developmental processes, it was suggested that the expression of PilASa4 protein might have positive effects on the fruiting body formation of M. xanthus DK10410 cells. Moreover, the formation of fruiting body in M. xanthus cells with stable exogenous TFPSa were compensated by mixing them with S. aurantiaca DSM17044 cells. Our results shed some light on the features and functions of type IV pilin homologues in S. aurantiaca.
On Translating Chinese Proverbs or Idioms in the Cross-Cultural Perspective
Xiuwen FENG
Cross-Cultural Communication , 2012, DOI: 10.3968/j.ccc.1923670020120806.zr6f
Abstract: Translating Chinese idioms is regarded as one of the greatest challenges, because Chinese idioms are a reflection of the rich cultural heritage of China, and most of them are not always easy to understand in lack of Chinese cultural background. This paper discusses two strategies of translating Chinese idioms. In order to introduce Chinese cultures to the foreigners, we prefer to the strategy of foreignization based on keeping to the functional equivalence in the cross-cultural perspective. Key words: Chinese proverbs or idioms; Cross-cultural communication
Transformed Residual Quantization for Approximate Nearest Neighbor Search
Jiangbo Yuan,Xiuwen Liu
Computer Science , 2015,
Abstract: The success of product quantization (PQ) for fast nearest neighbor search depends on the exponentially reduced complexities of both storage and computation with respect to the codebook size. Recent efforts have been focused on employing sophisticated optimization strategies, or seeking more effective models. Residual quantization (RQ) is such an alternative that holds the same property as PQ in terms of the aforementioned complexities. In addition to being a direct replacement of PQ, hybrids of PQ and RQ can yield more gains for approximate nearest neighbor search. This motivated us to propose a novel approach to optimizing RQ and the related hybrid models. With an observation of the general randomness increase in a residual space, we propose a new strategy that jointly learns a local transformation per residual cluster with an ultimate goal to reduce overall quantization errors. We have shown that our approach can achieve significantly better accuracy on nearest neighbor search than both the original and the optimized PQ on several very large scale benchmarks.
Does Ownership Structure Affect the Motivation of Compensation Contract of Earnings Management? —From China’s Data  [PDF]
Jing Long, Yanxi Li, Xiuwen Xu, Linlin Fu
Journal of Service Science and Management (JSSM) , 2011, DOI: 10.4236/jssm.2011.43041
Abstract: This paper is to explore that if ownership structure exactly affects on earnings management, especially on how to constrain executive compensation motivation to earnings management in the emerging market of China. We use five variables to quantify various corporate governance mechanisms including ownership structure and executive compensation for 1024 listed firms sample within two years. We find that earnings management is positively affected by executive compensation motivation, while this influence is constrained mostly by ownership concentration. This finding reflects the current situation for the weak corporate governance in the emerging market of China. Therefore, such a significant relationship is useful to control level of earnings management and improve the China’s emerging market developing healthily, stably and harmoniously.
Thermal Conductivity and Microstructure Properties of Porous SiC Ceramic Derived from Silicon Carbide Powder  [PDF]
Xiuwen Wu, Hongwen Ma, Xiaochao Chen, Zhanbing Li, Jie Li
New Journal of Glass and Ceramics (NJGC) , 2013, DOI: 10.4236/njgc.2013.31007
Abstract: Porous SiC ceramic were prepared with silicon carbide powder as the aggregate, silicone resin as the binder and pore agent by the process of mixing, iso-static pressure molding, and calcination. The mechanical properties and microstructures of the samples were characterized with a universal testing machine, X-ray diffraction, scanning electron microscope, and mercury injection. Two main factors, molding pressures and silicone resin mass ratio were studied in the experiments. The thermal conductivity of the samples was tested. The compressive strength was up to 19.4 MPa, and the porosities up to 30%. The thermal conductivities, mainly influenced by porosities, increased from 0.68 W.m-1.K-1 to 1.03 W.m-1.K-1 with the porosity decreasing from 41.96% to 31.30%.
Pharmacokinetics of recombinant human interleukin-3 in rhesus monkeys
Zhongming Tang,Xiuwen Liu,Min Tu
Science China Life Sciences , 1997, DOI: 10.1007/BF03183595
Abstract: Concentration-time profiles of125I-labeled recombinant human interleukin-3 (1251rhIL-3) were determined by reverse phase high performance liquid chromatography (RHPLC) after intravenous and subcutaneous administration of the drug in 16 rhesus monkeys. The initial and terminalT 1/2 in plasma after intravenous of 30 μg/kg were (0.15 ± 0.13) and (2.21 ± 0.59) h, respectively. Terminal half-lives after 30, 90 and 180 μg/kg subcutaneous (s. c.) injections were 2. 0–3. 8 h. Area under concentration-time curves (AUC) following s. c. were roughly increased with dose, while CLs were similar among different dosages. The absorption rates were dependent on concentration at injected site. Bioavailability was about 0.7 after s. c. Rapid biodegradation was found in plasma. Distribution profiles of total radioactivity were as follows: the highest level was found in urinary system; levels in bile-enteric system, lymph nodes, bone marrow and spleen were near to that in plasma, and level in brain was the lowest. The RH-PLC analysis revealed that kidney was one of the major organs for biodegradation.
Polytypism in LaOBiS2-type compounds based on different three-dimensional stacking sequences of two-dimensional BiS2 layers
Qihang Liu,Xiuwen Zhang,Alex Zunger
Physics , 2015,
Abstract: LaOBiS2-type materials have drawn much attention recently because of various interesting physical properties, such as low-temperature superconductivity, hidden spin polarization, and electrically tunable Dirac cones. However, it was generally assumed that each LaOBiS2-type compound has a unique and specific crystallographic structure separated from other phases (with a space group P4/nmm). Using first-principles total energy and stability calculations we find that contrary to this view the three-dimensional structure of this important family of compounds represents instead a family of energetically closely spaced modifications differing by the layer sequences and orientations. We find that the local Bi-S distortion, mainly induced by the interaction between the medium LaO and the BiS2 layers and the electron hybridization in the BiS2 layer, leads to three polytypes of LaOBiS2 according to the different stacking pattern of distorted BiS2 layers. Although the energy difference between the polytypes of LaOBiS2 is relatively small (within several meV/f.u.), they have obvious impact on the presence of inversion symmetry, which is reflected by the band structure and spin polarization. In addition, different choices of the medium atoms (replacing La) or active atoms (BiS2) manifest different ground state polytypes. One can thus tune the distortion and the ground state by substituting covalence atoms in LaOBiS2-family.
Intrinsic circular polarization in centrosymmetric stacks of transition-metal dichalcogenides
Qihang Liu,Xiuwen Zhang,Alex Zunger
Physics , 2014, DOI: 10.1103/PhysRevLett.114.087402
Abstract: The circular polarization (CP) that the photoluminescence inherits from the excitation source in n monolayers of transition-metal dichalcogenides (MX2)n has been previously explained as a special feature of odd values of n, where the inversion symmetry is absent. This valley polarization effect results from the fact that in the absence of inversion, charge carriers in different band valleys could be selectively excited by different circular polarized light. Such restriction to non-centrosymmetric systems poses a limitation on the material selection for achieving CP. Although several experiments observed CP in centrosymmetric MX2 systems e.g., for bilayer in MX2, they were dismissed as being due to some extrinsic sample irregularities. Here we show that also for n = even where inversion symmetry is present and valley polarization physics is strictly absent, such intrinsic selectivity in CP is to be expected on the basis of fundamental spin-orbit physics. First-principles calculations of CP predict significant polarization for n = 2 bilayers: from 69% in MoS2 to 93% in WS2. This realization could broaden the range of materials to be considered as CP sources.
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