作者机构：
[Ran, Peng; Liu, Zhi-Chao] Chongqing Univ Posts & Telecommun, Sch Biol Informat, Chongqing 400065, Peoples R China.;[Zhao, Yun-Jie] Cent China Normal Univ, Inst Biophys, Wuhan 430079, Peoples R China.;[Zhao, Yun-Jie] Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.;[Ran, Peng; Zeng, Chen; Liu, Zhi-Chao] George Washington Univ, Dept Phys, Washington, DC 20052 USA.;[Liu, Qin; Pan, Lei; Chen, Chan-You] Jianghan Univ, Sch Life Sci, Wuhan 430056, Peoples R China.
通讯机构：
[Zhao, Yun-Jie] C;[Pan, Lei] J;Cent China Normal Univ, Inst Biophys, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.;Jianghan Univ, Sch Life Sci, Wuhan 430056, Peoples R China.
摘要：
Plants and animals recognize microbial invaders by detecting pathogen-associated molecular patterns (PAMPs) through pattern-recognition receptors (PRRs). This recognition plays a crucial role in plant immunity. The newly discovered protein in plants that responds to bacterial flagellin, i.e., flagellin-sensitive 2 (FLS2), is ubiquitously expressed and present in many plants. The association of FLS2 and BAK1, facilitated by a highly conserved epitope flg22 of flagellin, triggers such downstream immune responses as activated MAPK pathway and elevated reactive oxygen species (ROS) for bacterial defense and plant immunity. Here we study the intrinsic dynamics and conformational change of FLS2 upon the formation of the FLS2–flg22–BAK1 complex. The top intrinsic normal modes and principal structural fluctuation components are very similar, showing two bending modes and one twisting mode. The twisting mode alone, however, accounts for most of the conformational change of FLS2 induced by binding with flg22 and BAK1. This study indicates that flg22 binding suppresses FLS2 conformational fluctuation, especially on the twisting motion, thus facilitating FLS2–BAK1 interaction. A detailed analysis of this sensing mechanism may aid better design on both PRR and peptide mimetics for plant immunity.
作者机构：
[Zhang, Hui; Hou, Defu] Cent China Normal Univ, Inst Particle Phys IOPP, Wuhan 430079, Peoples R China.;[Zhang, Hui; Hou, Defu] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Zhang, Hui] South China Normal Univ, Guangdong Prov Key Lab Nucl Sci, Inst Quantum Matter, Guangzhou 510006, Peoples R China.;[Zhang, Hui; Liao, Jin-Feng] Indiana Univ, Dept Phys, 2401 N Milo B Sampson Lane, Bloomington, IN 47408 USA.;[Zhang, Hui; Liao, Jin-Feng] Indiana Univ, Ctr Explorat Energy & Matter, 2401 N Milo B Sampson Lane, Bloomington, IN 47408 USA.
通讯机构：
[Hou, Defu] C;[Liao, Jin-Feng] I;Cent China Normal Univ, Inst Particle Phys IOPP, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;Indiana Univ, Dept Phys, 2401 N Milo B Sampson Lane, Bloomington, IN 47408 USA.
作者机构：
[Wang, Enke; Zhang, Ben-Wei; Chen, Shi-Yong] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Wang, Enke; Zhang, Ben-Wei; Chen, Shi-Yong] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Wang, Enke; Zhang, Ben-Wei] South China Normal Univ, Inst Quantum Matter, Guangzhou 510006, Peoples R China.
通讯机构：
[Zhang, Ben-Wei] C;[Zhang, Ben-Wei] S;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;South China Normal Univ, Inst Quantum Matter, Guangzhou 510006, Peoples R China.
摘要：
The averaged jet charge characterizes the electric charge of the initiating parton and provides a powerful tool to distinguish quark jets from gluon jets.We predict,for the first time,the medium modification of the averaged jet charge in the heavy-ion collisions at the LHC,where jet productions in p+p collisions are simulated by PYTHIA6,and the parton energy loss in QGP is calculated with two Monte Carlo models of jet quenching:PYQUEN and JEWEL.We found that the distribution of averaged jet charge is significantly suppressed by initial state isospin effects due to the participation of neutrons with zero electric charge during nuclear collisions.The considerable enhancement of the averaged jet charge in central Pb+Pb collisions is observed relative to peripheral collisions,since the jet quenching effect is more pronounced in central collisions.The distinct feature of the averaged jet charge between quark and gluon jets,along with the sensitivity of medium modifications on the jet charge to flavor dependence of the parton energy loss,could be very useful to discriminate the energy loss pattern between quark and gluon jets in heavy-ion collisions.
作者机构：
[Ketel, T.; Mulder, M.; Tuning, N.; Hynds, D.; van Tilburg, J.; de Vries, J. A.; Veronesi, M.; Aaij, R.; Greim, R.; van Beuzekom, M.; Dufour, L.; Jans, E.; Bel, L. J.; Esen, S.; Dall'Occo, E.; Pellegrino, A.; Vitkovskiy, A.; Merk, M.; Archilli, F.; van Veghel, M.; Koppenburg, P.; Gras, C. Sanchez; Raven, G.; Sierra, C. Vazquez; Govorkova, E.; Kostiuk, I.; Benson, S.; Hulsbergen, W.] Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands.;[Tourinho Jadallah Aoude, R.; Massafferri, A.; Cruz Torres, M.; De Miranda, J. M.; Soares Lavra, L.; Gomes, A.; Bediaga, I.; dos Reis, A. C.] CBPF, Rio De Janeiro, Brazil.;[Lopes, J. H.; Polycarpo, E.; Souza De Paula, B.; Gandelman, M.; Rangel, M. S.; Ferreira Rodrigues, F.; Otalora Goicochea, J. M.; Carvalho Akiba, K.; Silva de Oliveira, L.; De Paula, L.; Nasteva, I.; Da Cunha Marinho, F.; Amato, S.] Univ Fed Rio de Janeiro UFRJ, Rio De Janeiro, Brazil.;[Gao, Y.; Yang, Z.; Jiang, F.; Xu, A.; Ren, Z.; Tang, Z.; Xu, Z.; Wang, M.; Zhang, W. C.; Gu, C.; Sun, J.; Chen, C.; Zhu, X.; Davis, A.; Zhang, L.; Gan, Y.; Liu, X.] Tsinghua Univ, Ctr High Energy Phys, Beijing, Peoples R China.;[Li, Y.; Zhang, Y.; Wang, J.] Ihep, Beijing, Peoples R China.
通讯机构：
[Vieites Diaz, M.] U;Univ Santiago de Compostela, IGFAE, Santiago De Compostela, Spain.
关键词：
charmed baryons;limits on production of particles;charmed quarks;experimental tests
摘要：
A search for the doubly charmed baryon $$\Xi_{cc}^+$$ is performed through its decay to the $$\Lambda_c^ + {K^ -}{\pi ^ +}$$ final state, using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7, 8 and 13 TeV. The data correspond to a total integrated luminosity of 9 fb−1. No significant signal is observed in the mass range from 3.4 to 3.8 GeV/c2. Upper limits are set at 95% credibility level on the ratio of the $$\Xi_{cc}^+$$ production cross-section times the branching fraction to that of $$\Lambda_c^ + $$ and $$\Xi_{cc}^{+ +}$$ baryons. The limits are determined as functions of the $$\Xi_{cc}^+$$ mass for different lifetime hypotheses, in the rapidity range from 2.0 to 4.5 and the transverse momentum range from 4 to 15 GeV/c.
摘要：
Nonaqueous Li-O-2 batteries attract attention for their theoretical specific energy density. However, due to the difficulty of decomposition of Li2O2, Li-O-2 batteries have high charge overpotential and poor cycling life. So all kinds of catalysts have been studied on the cathode. Compared to heterogeneous solid catalysts, soluble catalysts achieve faster and more effective transport of electrons by reversible redox pairs. Here, we first report ruthenocene (Ruc) as a mobile redox mediator in a Li-O-2 battery. 0.01 mol/L Ruc in the electrolyte effectively reduces the charging voltage by 610 mV. Additionally, Ruc greatly increases the cycling life by four-fold (up to 83 cycles) with a simple ketjen black (KB) cathode. The results of SEM, XPS and XRD confirm that less discharge product residue accumulated after recharge. To verify the reaction mechanisms of the mediator, free energy profiles of the possible reaction pathways based on DFT are provided. (C) 2019 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
摘要：
Within an advanced Langevin-hydrodynamics framework coupled to a hybrid fragmentation-coalescence hadronization model, we study heavy flavor quenching and flow in relativistic heavy-ion collisions. We investigate how the initial heavy quark spectrum, the in-medium energy loss and hadronization mechanisms of heavy quarks, the evolution profile of the pre-equilibrium stage, the medium flow, and the temperature dependence of heavy quark diffusion coefficients influence the suppression and elliptic flow of heavy mesons at the RHIC and the LHC. Our results show that the different modeling of initial conditions, pre-equilibrium evolution, and in-medium interactions can individually yield uncertainties of approximately 10-40% in D meson suppression and flow at a low transverse momentum. We also find that proper combinations of collisional versus radiative energy loss, coalescence versus fragmentation in hadronization, and the inclusion of medium flow are the most important factors for describing the suppression and elliptic flow of heavy mesons.
作者：
Jiang, Ze-Fang*;She, Duan;Yang, C. B.（杨纯斌）;Hou, Defu
期刊：
中国物理C,2020年44(8):164-171 ISSN：1674-1137
通讯作者：
Jiang, Ze-Fang
作者机构：
[Jiang, Ze-Fang] Hubei Engn Univ, Dept Phys & Elect Informat Engn, Xiaogan 432000, Peoples R China.;[Yang, C. B.; Hou, Defu; She, Duan; Jiang, Ze-Fang] Cent China Normal Univ, Inst Particle Phys, MOE, Wuhan 430079, Peoples R China.;[Yang, C. B.; Hou, Defu; She, Duan; Jiang, Ze-Fang] Cent China Normal Univ, MOE, Key Lab Quark & Lepton Phys, Wuhan 430079, Peoples R China.;[Yang, C. B.; She, Duan] Indiana Univ, Dept Phys, 2401 N Milo B Sampson Lane, Bloomington, IN 47408 USA.;[Yang, C. B.; She, Duan] Indiana Univ, Ctr Explorat Energy & Matter, 2401 N Milo B Sampson Lane, Bloomington, IN 47408 USA.
通讯机构：
[Jiang, Ze-Fang] H;[Jiang, Ze-Fang] C;Hubei Engn Univ, Dept Phys & Elect Informat Engn, Xiaogan 432000, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, MOE, Wuhan 430079, Peoples R China.;Cent China Normal Univ, MOE, Key Lab Quark & Lepton Phys, Wuhan 430079, Peoples R China.
关键词：
heavy ion collision;longitudinal expanding fireball;viscous hydrodynamics;Rindler coordinate
摘要：
The solutions of the relativistic viscous hydrodynamics for longitudinally expanding fireballs are investigated with the Navier-Stokes theory and Israel-Stewart theory. The energy and the Euler conservation equations for the viscous fluid are derived in Rindler coordinates, by assuming that the longitudinal expansion effect is small. Under the perturbation assumption, an analytical perturbation solution for the Navier-Stokes approximation and numerical solutions for the Israel-Stewart approximation are presented. The temperature evolution with both shear viscous effect and longitudinal acceleration effect in the longitudinal expanding framework are presented. The specific temperature profile shows symmetric Gaussian shape in the Rindler coordinates. Further, we compare the results from the Israel-Stewart approximation with the results from the Bjorken and the Navier-Stokes approximations, in the presence of the longitudinal acceleration expansion effect. We found that the Israel-Stewart approximation gives a good description of the early stage evolutions than the Navier-Stokes theory.
作者机构：
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China;[Wu, J.] University of Chinese Academy of Sciences, Beijing, 100049, China;[Liu, X.; Han, C.] Nankai University, Tianjin, 300071, China;[Chang, N.] Xinyang Normal University, Xinyang, 464000, China;[Yao, D.; Chen, Z.; Dai, L.] Hunan University, Changsha, 410082, China
摘要：
轻子散射实验是探索核子与原子核结构的理想工具。中国电子离子对撞机（Electron Ion Collider in China,EicC）建议书设想在已开建的强流重离子加速器装置（High Intensity heavy ion Accelerator Facility,HIAF）的基础上,升级质子束流为20 GeV的极化束流,并建造2.8～5 GeV极化电子束流,从而实现质心系能量为15～20 GeV的双极化电子-离子对撞。EicC设计的亮度为（2～4）×1033cm-2?s-1,质子束流极化率达到70%,电子束流极化率达到80%。该装置除了能提供极化轻离子束流（例如:氦-3）外,也可产生非极化重离子束流（碳-12～铀-238）。EicC将聚焦核子海夸克部分子结构、原子核物质结构与性质、奇特强子态三个方面的物理研究。高亮度、高精度的对撞机有助于精确地测量核子结构函数并对核子进行三维成像,揭示强相互作用的动力学规律;原子核部分子分布包括核子短程关联以及原子核介质效应同样是该提案的重要科学目标;EicC能区接近重味夸克产生阈值,在研究重味强子谱方面拥有低背景的独特优势,有助于发现研究新的奇特强子态。质子质量起源问题也可以通过重味矢量介子的产生来研究。为了完成上述物理目标,我们将利用最先进的探测器技术建造接近全立体角覆盖的EicC对撞机谱仪。在准备EicC白皮书的过程中,我们得到世界各国专家的支持。EicC的物理与已有的实验和美国即将建设的EIC中的物理项目相互补充。EicC的建成及运行有望引领前沿的中高能核物理研究,使我国在加速器和探测器先进技术等领域实现跨越式发展,为我国核物理与强子物理以及相关科学领域提供大型综合实验平台与人才培养基地。
作者机构：
[Zhao, Yunjie] Cent China Normal Univ, Inst Biophys, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Zhao, Yunjie] C;Cent China Normal Univ, Inst Biophys, Wuhan 430079, Peoples R China.
摘要：
The RNA tertiary structure is essential to understanding the function and biological processes. Unfortunately, it is still challenging to determine the large RNA structure from direct experimentation or computational modeling. One promising approach is first to predict the tertiary contacts and then use the contacts as constraints to model the structure. The RNA structure modeling depends on the contact prediction accuracy. Although many contact prediction methods have been developed in the protein field, there are only several contact prediction methods in the RNA field at present. Here, we first review the theoretical basis and test the performances of recent RNA contact prediction methods for tertiary structure and complex modeling problems. Then, we summarize the advantages and limitations of these RNA contact prediction methods. We suggest some future directions for this rapidly expanding field in the last.
