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Search Results: 1 - 10 of 18623 matches for " WenYuan Han "
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Quality Analysis on the Engineering Master of Biotechnology Specialty from Enterprise  [PDF]
Xinglin Li, Yang Han, Aijie Cao, Jun Zhao, Liming Zhang, Shuli Man, Wenyuan Gao
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.37B022
Abstract: In order to express the engineering master’s culture status of biotechnology from some enterprises, by questionnaire, 27 engineering masters from some enterprises and 22 academic masters from two universities, were investigated on the graduate students’ origin, their tutors’ title, the enterprise size and classify, their dissertation theme emphasis and classify, and the experiment condition for their dissertations. The results indicated that, the engineering masters were better than the academic masters on the practice condition and the practice chances, whereas, the academic masters markedly excelled the engineering masters on the tutors’ level, the test condition, and the innovation environment of science and technology.
An archaeal protein evolutionarily conserved in prokaryotes is a zinc-dependent metalloprotease
Yongmei Hu,Nan Peng,Wenyuan Han,Yuxia Mei
Bioscience Reports , 2012, DOI: 10.1042/bsr20120074
Abstract: A putative protease gene (tldD) was previously identified from studying tolerance of letD encoding the CcdB toxin of a toxin–antidote system of the F plasmid in Escherichia coli. While this gene is evolutionarily conserved in archaea and bacteria, the proteolytic activity of encoded proteins remained to be demonstrated experimentally. Here we studied Sso0660, an archaeal TldD homologue encoded in Sulfolobus solfataricus by overexpression of the recombinant protein and characterization of the purified enzyme. We found that the enzyme is active in degrading azocasein and FITC–BSA substrates. Protease inhibitor studies showed that EDTA and o-phenanthroline, two well-known metalloprotease inhibitors, either abolished completely or strongly inhibited the enzyme activity, and flame spectrometric analysis showed that a zinc ion is a cofactor of the protease. Furthermore, the protein forms disulfide bond via the Cys416 residue, yielding protein dimer that is the active form of the enzyme. These results establish for the first time that tidD genes encode zinc-containing proteases, classifying them as a family in the metalloprotease class.
Sulfolobus tokodaii RadA paralog, stRadC2, is involved in DNA recombination via interaction with RadA and Hjc
Lei Wang,DuoHong Sheng,WenYuan Han,Bin Huang,ShanShan Zhu,JinFeng Ni,Jia Li,YuLong Shen
Science China Life Sciences , 2012, DOI: 10.1007/s11427-012-4292-0
Abstract: Rad51/RadA paralogs found in eukaryotes and euryarchaea play important roles during recombination and repair, and mutations in one of the human Rad51 paralogs, Rad51C, are associated with breast and ovarian cancers. The hyperthermophilic crenarchaeon Sulfolobus tokodaii encodes four putative RadA paralogs and studies on these proteins may assist in understanding the functions of human Rad51 paralogs. Here, we report the biochemical characterization of stRadC2, a S. tokodaii RadA paralog. Pull-down assays revealed that the protein was able to interact with the recombinase, RadA, and the Holliday junction endonuclease, Hjc. stRadC2 inhibited the strand exchange activity of RadA and facilitated Hjc-mediated Holliday junction DNA cleavage in vitro. RT-PCR analysis revealed that stRadC2 transcription was immediately reduced after UV irradiation, but was restored to normal levels at the late stages of DNA repair. Our results suggest that stRadC2 may act as an antirecombination factor in DNA recombinational repair in S. tokodaii.
Replica exchange molecular dynamics optimization of tensor network states for quantum many-body systems
Wenyuan Liu,Chao Wang,Yanbin Li,Yuyang Lao,Yongjian Han,Guang-Can Guo,Lixin He
Physics , 2014, DOI: 10.1088/0953-8984/27/8/085601
Abstract: The tensor network states (TNS) methods combined with Monte Carlo (MC) techniques have been proved a powerful algorithm for simulating quantum many-body systems. However, because the ground state energy is a highly non-linear function of the tensors, it is easy to get stuck in local minima when optimizing the TNS of the simulated physical systems. To overcome this difficulty, we introduce a replica-exchange molecular dynamics optimization algorithm to obtain the TNS ground state, based on the MC sampling techniques, by mapping the energy function of the TNS to that of a classical dynamical system. The method is expected to effectively avoid local minima. We make benchmark tests on a 1D Hubbard model based on matrix product states (MPS) and a Heisenberg $J_1$-$J_2$ model on square lattice based on string bond states (SBS). The results show that the optimization method is robust and efficient compared to the existing results.
Peripheral structures of relatively hyperbolic groups
Wenyuan Yang
Mathematics , 2011,
Abstract: In this paper, we introduce and characterize a class of parabolically extended structures for relatively hyperbolic groups. A characterization of relative quasiconvexity with respect to parabolically extended structures is obtained using dynamical methods. Some applications are discussed. The class of groups acting geometrically finitely on Floyd boundaries turns out to be easily understood. However, we also show that Dunwoody's inaccessible group does not act geometrically finitely on its Floyd boundary.
Growth tightness for groups with contracting elements
Wenyuan Yang
Mathematics , 2013, DOI: 10.1017/S0305004114000322
Abstract: We establish growth tightness for a class of groups acting geometrically on a geodesic metric space and containing a contracting element. As a consequence, any group with nontrivial Floyd boundary are proven to be growth tight with respect to word metrics. In particular, all non-elementary relatively hyperbolic group are growth tight. This generalizes previous works of Arzhantseva-Lysenok and Sambusetti. Another interesting consequence is that CAT(0) groups with rank-1 elements are growth tight with respect to CAT(0)-metric.
Combination of fully quasiconvex subgroups and its applications
Wenyuan Yang
Mathematics , 2012,
Abstract: In this paper, we state two combination theorems for relatively quasiconvex subgroups in a relatively hyperbolic group. Applications are given to the separability of double cosets of certain relatively quasiconvex subgroups and the existence of closed surface subgroups in relatively hyperbolic groups.
Patterson-Sullivan measures and growth of relatively hyperbolic groups
Wenyuan Yang
Mathematics , 2013,
Abstract: We prove that for a relatively hyperbolic group G there is a sequence of relatively hyperbolic proper quotients such that their growth rates converge to the growth rate of G. Under natural assumptions, the same conclusion holds for the critical exponent of a cusp-uniform action of G on a hyperbolic metric space. As a corollary, we obtain that the critical exponent of a torsion-free geometrically finite Kleinian group can be arbitrarily approximated by those of quotient groups. This resolves a question of Dal'bo-Peign\'e-Picaud-Sambusetti. Our approach is based on the study of Patterson-Sullivan measures on Bowditch boundary of a relatively hyperbolic group. The uniqueness and ergodicity of Patterson-Sullivan measures are proved when the group is divergent. We prove a variant of the Sullivan Shadow Lemma, called Partial Shadow Lemma. This tool allows us to prove several results on growth functions of balls and cones. One central result is the existence of a sequence of geodesic trees with growth rates sufficiently close to the growth rate of G, and transition points uniformly spaced in trees. By taking small cancellation over hyperbolic elements of high powers, we can embed these trees into properly constructed quotients of G. This proves the results in the previous paragraph.
Analysis and assessment of Chinese eco-environmental situation
Niu Wenyuan,
Niu
,Wenyuan

环境科学学报(英文版) , 1990,
Abstract: In order to give out the correct conclusion for evaluating Chinese eco-environmental situation, in this paper, a special assessmental procedure has been used to analyse following 7 basic environmental problems: (1) Natural hazards; (2) Soil erosion; (3) Forest shrinkage and grassland degradation; (4) Water resources shortage; (5) Desertification; (6) Environmental pollution; (7) Farmland decrease. The basic strategies for improving Chinese environmental situation have been suggested.
Virtual Prototype Modeling and Simulation of Pipe Wagon Articulating System  [PDF]
Ying Li, Samuel Frimpong, Wenyuan Liu
Modern Mechanical Engineering (MME) , 2011, DOI: 10.4236/mme.2011.12006
Abstract: Virtual prototype of pipe wagon articulating (PWA) system has been developed and simulated based on the kinematics and dynamics of machinery and Automatic Dynamic Analysis of Mechanical Systems (ADAMS) software. It has been integrated with real-time three dimensional (3-D) system simulations for detailed and responsive interaction with dynamic virtual environments. By using this virtual model, the conceptual design examination and performance analysis of the PWA system have been realized dynamically in virtual laboratory. System dynamic force, displacement and tension of pipe have been measured through verifying this 3- D virtual prototype. By comparing the static tension and dynamic tension of pipe, the difference between the two kind tensions has been found. The simulated dynamic tension is much greater than the static tension obtained from the static theory. The results attained in this work suggest that the conceptual designed PWA system can meet the requirements of the operation.
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