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Search Results: 1 - 10 of 61386 matches for " ZENG Zhao-Qing "
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A new combination of Allantonectria (Hypocreales)

ZENG Zhao-Qing,ZHUANG Wen-Ying,

菌物学报 , 2013,
Abstract: Nectria zangii on Populus is transferred to the newly recovered genus Allantonectria as A. zangii comb. nov. The perithecial anatomy, subcylindrical to cylindric-clavate asci and allantoid to rod-shaped ascospores indicate its close relationship with A. miltina, the type species of Allantonectria. The taxonomic position of this fungus in Allantonectria other than Nectria is also confirmed by the DNA sequence analysis of six loci.
DNA molecular marker techniques: application to and influence on fungal systematics

YU Zhi-He,ZENG Zhao-Qing,

菌物学报 , 2013,
Abstract: DNA molecular markers technique has been introduced as new approaches to study fungal phylogeny and evolution. Nowadays, fungal molecular systematics is a mature discipline, and the history of development and representative research approaches of fungal molecular systematics and the main attributions of these approaches to fungal systematics are discussed in this paper. The organisms studied by mycologists, fungi, are divided into three different groups. The slime moulds and oomycetes do not belong to the Kingdom of Fungi. The recent milestone is the AFTOL (Assembling the Fungal Tree of Life) project, in which a higher-level phylogenetic classification of the Fungi is proposed. The kingdom Fungi traditionally consisted of Ascomycota, Basidiomycota, Chytridiomycota and Zygomycota, but more recent classifications of the fungal kingdom now include Ascomycota, Basidiomycota, Chytridiomycota, Blastocladiomycota, Neocallimastigomycota, Glomeromycota, Microsporidia and several subphyla incertae sedis, including Mucoromycotina, Entomophthoromycotina, Kickxellomycotina and Zoopagomycotina. The concept of the different taxa in fungi has also been revised. Furthermore, the investigation of molecular markers technique influences the fields such as fungal species concept recognition, the connection of teleomorph and anamorph, and molecular fungal ecology, etc.
Preparation and Enhancement of Thermal Conductivity of Heat Transfer Oil-Based MoS2 Nanofluids
Yuan-Xian Zeng,Xiu-Wen Zhong,Zhao-Qing Liu,Shuang Chen,Nan Li
Journal of Nanomaterials , 2013, DOI: 10.1155/2013/270490
Abstract: The lipophilic MoS2 nanoparticles are synthesized by surface modification with stearic acid (SA). The heat transfer oil-based nanofluids, with the mass fraction of lipophilic nanoparticles varying from 0.25% up to 1.0%, are prepared and their thermal conductivity is determined at temperatures ranging from 40 to 200°C using an apparatus based on the laser flash method. It has been found that the nanofluids have higher thermal conductivity and the thermal conductivity enhancement increased not only with increasing mass fraction of nanoparticles, but also with increasing temperature in the range 40–180°C The results show a 38.7% enhancement of the thermal conductivity of MoS2 nanofluid with only 1.0% mass fraction at 180°C. 1. Introduction Heat transfer fluids, such as water, ethylene glycol, and mineral oil, play important roles in many thermal transport applications. Their low thermal conductivity is one of the limits of the traditional heat transfer fluids. In order to improve the low thermal characteristics of the conventional heat transfer fluids, solid nanoparticles are added to form nanofluids, which were first introduced by Choi [1]. Enhanced thermo-physical properties are the main favorable characteristics of nanofluids based on the fact that most solids have much higher thermal conductivities than common fluids. In the past decade, enhanced thermal conductivities of the water or ethylene glycol-based nanofluids containing a small amount of metals, metal oxides, nonmetallic materials, and polymers have been reported [2–8]. Currently many efforts have been focused on the oil-based nanofluids because of the needs in many industry fields to develop heat transfer fluids with preferred heat transfer properties in high temperature. Various oil-based nanofluids with silicon oil, diathermic oil, engine oil, and heat transfer oil used as the based fluid have been prepared [9–12]. However, the nanoparticles are easily sedimented after being added to the oil because of the poor compatibility between the nanoparticles and the base oil. The dispersion of nanoparticles in oils is still a principal problem for the application of nanofluids. In order to obtain better dispersion, an appropriate lipophilic modification process can be employed to improve the compatibility between the nanoparticles and the oil-based fluid. The organic ligands with long hydrocarbon chains were linked to the surface of the nanoparticles, and the surface-modified nanoparticles possess good dispersion behavior in oils. So far, most of these oil-soluble nanoparticles are investigated as
Striking a Balance: Modulation of Host Cell Death Pathways by Legionella Pneumophila
Zhao-Qing Luo
Frontiers in Microbiology , 2011, DOI: 10.3389/fmicb.2011.00036
Abstract: Programmed cell death is considered the ultimate solution for the host to eliminate infected cells, leading to the abolishment of the niche for microbial replication and the ablation of infection. Thus, it is not surprising that successful pathogens have evolved diverse strategies to reprogram the cell death pathways for their proliferation. Using effector proteins translocated by the Dot/Icm type IV secretion system, the facultative intracellular pathogen Legionella pneumophila manipulates multiple host cellular processes to create a niche within host cells to support its replication. Investigation in the past decade has established that in mammalian cells this bacterium actively modulates two host cell death pathways, namely the canonical apoptotic pathway controlled by the mitochondrion and the pyroptotic pathway controlled by the Nod-like receptor Naip5 and the Ipaf inflammasome. In this review, I will discuss the recent progress in understanding the mechanisms the bacterium employs to interfere with these host cell death pathways and how such modulation contribute to the intracellular life cycle of the pathogen.
Momentum dependence of the symmetry potential and its influence on nuclear reactions
Zhao-Qing Feng
Physics , 2011, DOI: 10.1103/PhysRevC.84.024610
Abstract: A Skyrme-type momentum-dependent nucleon-nucleon force distinguishing isospin effect is parameterized and further implemented in the Lanzhou Quantum Molecular Dynamics (LQMD) model for the first time, which leads to a splitting of nucleon effective mass in nuclear matter. Based on the isospin- and momentum-dependent transport model, we investigate the influence of momentum-dependent symmetry potential on several isospin-sensitive observables in heavy-ion collisions. It is found that symmetry potentials with and without the momentum dependence but corresponding to the same density dependence of the symmetry energy result in different distributions of the observables. The mid-rapidity neutron/proton ratios at high transverse momenta and the excitation functions of the total $\pi^{-}/\pi^{+}$ and $K^{0}/K^{+}$ yields are particularly sensitive to the momentum dependence of the symmetry potential.
Dynamics of strangeness and collective flows in heavy-ion collisions near threshold energies
Zhao-Qing Feng
Physics , 2013, DOI: 10.1016/j.nuclphysa.2013.10.005
Abstract: Strangeness (K$^{0,+}$, $\Lambda$ and $\Sigma^{-,0,+}$) production in heavy-ion collisions near threshold energies has been investigated within the Lanzhou quantum molecular dynamics (LQMD) transport model. The kaon (anti-kaon)-nucleon and hyperon-nucleon potentials in dense nuclear matter are implemented in the model, which are computed from the chiral perturbation approach and the relativistic mean-field model, respectively. It is found that the in-medium potentials change the structure of transverse flow, and also affect the rapidity distributions and the inclusive spectra for strangeness production. The local temperature of the fire ball extracted from the kaon spectra of inclusive invariant cross sections is influenced by the kaon-nucleon potential. The stiffness of nuclear symmetry energy and the kaon-nucleon potential by distinguishing isospin effect play a significant role on the ratio of K$^{0}$/K$^{+}$, in particular at the subthreshold energies. The ratio of $\Sigma^{-}/\Sigma^{+}$ depends on the high-density symmetry energy, in which the $\Sigma$-nucleon potential has a neglectable contribution on the isospin ratio.
Constraining the high-density behavior of nuclear equation of state from strangeness production in heavy-ion collisions
Zhao-Qing Feng
Physics , 2011, DOI: 10.1103/PhysRevC.83.067604
Abstract: The dynamics of pions and strange particles in heavy-ion collisions in the region of 1A GeV energies is investigated by the lanzhou quantum molecular dynamics model for probing the nuclear equation of state at supra-saturation densities. The total multiplicities and the ratios obtained in $^{197}$Au+$^{197}$Au over $^{12}$C+$^{12}$C systems are calculated for selected Skyrme parameters SkP, SLy6, Ska and SIII, which correspond to different modulus of incompressibility of symmetric nuclear matter and different cases of the stiffness of symmetry energy. A decrease trend of the excitation functions of the ratios for strange particle production with increasing incident energy was observed. The available data of K$^{+}$ production measured by KaoS collaboration are described well with the parameter SkP, which results in a soft equation of state. The conclusions can not be modified by an in-medium kaon-nucleon potential.
Nuclear in-medium effects and collective flows in heavy-ion collisions at intermediate energies
Zhao-Qing Feng
Physics , 2011, DOI: 10.1103/PhysRevC.85.014604
Abstract: A recent updated version of the Lanzhou quantum molecular dynamics is reviewed, in which the momentum dependence of symmetry potential and the effective mass splitting of proton and neutron in nuclear medium are included in the model. The in-medium nucleon-nucleon (NN) elastic cross sections are evaluated with the scaling approach according to the effective mass and their influence on collective flows in heavy-ion collisions are discussed. The inelastic cross sections, in particular for the process of the channel N$\Delta\rightarrow$NN, are parameterized in accordance with the available experimental data. It is found that the in-medium cross sections play a significant role on isospin emissions and result in a flat distribution for transverse flows and elliptic flows of free nucleons comparing with the in-vacuum ones. The rapidity distribution of the difference between neutron and proton transverse flows is sensitive to the stiffness of nuclear symmetry energy as a promising observable, which can not be influenced by the in-medium effect and collision centrality. Furthermore, the elliptic flow of free energetic nucleons in the case of the mass splitting of $m_{n}^{\ast}>m_{p}^{\ast}$ is also related to the symmetry energy. However, the pion flows weakly depend on the symmetry energy and the mass splitting.
Transverse emission of isospin ratios as a probe of high-density symmetry energy in isotopic nuclear reactions
Zhao-Qing Feng
Physics , 2011, DOI: 10.1016/j.physletb.2011.12.001
Abstract: Transverse emission of preequilibrium nucleons, light clusters (complex particles) and charged pions from the isotopic $^{112,124}$Sn+$^{112,124}$Sn reactions at a beam energy of 400\emph{A} MeV, to extract the high-density behavior of nuclear symmetry energy, are investigated within an isospin and momentum dependent transport model. Specifically, the double ratios of neutron/proton, triton/helium-3 and $\pi^{-}/\pi^{+}$ in the squeeze-out domain are analyzed systematically, which have the advantage of reducing the influence of the Coulomb force and less systematic errors. It is found that the transverse momentum distribution of isospin ratios strongly depend on the stiffness of nuclear symmetry energy, which would be a nice observable to extract the high-density symmetry energy. The collision centrality and the mass splitting of neutron and proton in nuclear medium play a significant role on the distribution structure of the ratios, but does not change the influence of symmetry energy on the spectrum.
Nuclear in-medium effects of strange particles in proton-nucleus collisions
Zhao-Qing Feng
Physics , 2014, DOI: 10.1103/PhysRevC.90.064604
Abstract: Dynamics of strange particles produced in proton induced nuclear reactions near threshold energies has been investigated within the Lanzhou quantum molecular dynamics (LQMD) transport model. The in-medium modifications on particle production in dense nuclear matter are considered through corrections on the elementary cross sections via the effective mass and the mean-field potentials. It is found that the attractive antikaon-nucleon potential enhances the subthreshold $\bar{K}$ production and also influences the structure of inclusive spectra. The strangeness production is strongly suppressed in proton induced reactions in comparison to heavy-ion collisions. The measured K$^{-}$/K$^{+}$ ratios in the $^{12}$C+$^{12}$C and p+$^{12}$C collisions from KaoS collaboration have been well explained with inclusion of the in-medium potentials.
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