Changsha, China

Hunan Normal University

www.hunnu.edu.cn
Changsha, China

Hunan Normal University , founded in 1938, is a higher education institution located in Changsha, Hunan Province, People's Republic of China. It has existed for 72 years. The University is a national 211 Project university, one of the country's 100 key universities in the 21st century that enjoy priority in obtaining national funds. Wikipedia.

SEARCH FILTERS
Time filter
Source Type

Yao W.,Hunan Normal University | Jing J.,Hunan Normal University
Nuclear Physics B | Year: 2014

We investigate the holographic entanglement entropy in the metal/superconductor phase transition for the Born-Infeld electrodynamics with full backreaction and note that the entropy is a good probe to study the properties of the phase transition. For the operator 〈O-〉, we find that the entanglement entropy decreases (or increases) with the increase of the Born-Infeld parameter b in the metal (or superconducting) phase. For the operator 〈O+〉, we observe that, with the increase of the Born-Infeld parameter, the entanglement entropy in the metal phase decreases monotonously but the entropy in the superconducting phase first increases and forms a peak at some threshold bT, then decreases continuously. Moreover, the value of bT becomes smaller as the width of the subsystem A decreases. © 2014 The Authors.


Liu H.,Hunan Normal University | Cheng L.,Tsinghua University
Science | Year: 2015

Double-stranded RNA (dsRNA) viruses possess a segmented dsRNA genome and a number of RNA-dependent RNA polymerases (RdRps) enclosed in a capsid. Until now, the precise structures of genomes and RdRps within the capsids have been unknown. Here we report the structures of RdRps and associated RNAs within nontranscribing and transcribing cypoviruses (NCPV and TCPV, respectively), using a combination of cryo-electron microscopy (cryo-EM) and a symmetry-mismatch reconstruction method. The RdRps and associated RNAs appear to exhibit a pseudo-D3 symmetric organization in both NCPV and TCPV. However, the molecular interactions between RdRps and the genomic RNA were found to differ in these states. Our work provides insight into the mechanisms of the replication and transcription in dsRNA viruses and paves a way for structural determination of lower-symmetry complexes enclosed in higher-symmetry structures.


Xiao L.,Hunan Normal University | Yeung E.S.,Iowa State University
Annual Review of Analytical Chemistry | Year: 2014

Imaging of plasmonic nanoparticles (PNP) with optical microscopy has aroused considerable attention in recent years. The unique localized surface plasmon resonance (LSPR) from metal nanoparticles facilitates the transduction of a chemical or physical stimulus into optical signals in a highly efficient way. It is therefore possible to perform chemical or biological assays at the single object level with the help of standard optical microscopes. Because the source of background noise from different samples is different, distinct imaging modalities have been developed to discern the signals of interest in complex surroundings. With these convenient yet powerful techniques, great improvements in chemical and biological assays have been demonstrated, and many interesting phenomena and dynamic processes have also been elucidated. Further development and application of optical imaging methods for plasmonic probes should lead to many exciting results in chemistry and biology in the future. © Copyright ©2014 by Annual Reviews. All rights reserved.


Liu Y.,Hunan Normal University
International journal of nanomedicine | Year: 2011

Smaller nanoparticles facilitate the delivery of DNA into cells through endocytosis and improve transfection efficiency. The aim of this study was to determine whether protamine sulfate-coated calcium phosphate (PS-CaP) could stabilize particle size and enhance transfection efficiency. pEGFP-C1 green fluorescence protein was employed as an indicator of transfection efficiency. Atomic force microscopy was used to evaluate the morphology and the size of the particles, and an MTT assay was introduced to detect cell viability and inhibition. The classical calcium phosphate method was used as the control. Atomic force microscopy images showed that the PS-CaP were much smaller than classical calcium phosphate particles. In 293 FT, HEK 293, and NIH 3T3 cells, the transfection efficiency of PS-CaP was higher than for the classical calcium phosphate particles. The difference in efficiencies implies that the smaller nanoparticles may promote the delivery of DNA into cells through endocytosis and could improve transfection efficiency. In addition, PS-CaP could be used to transfect HEK 293 cells after one week of storage at 4°C with a lesser extent of efficiency loss compared with classical calcium phosphate, indicating that protamine sulfate may increase the stability of calcium phosphate nanoparticles. The cell viability inhibition assay indicated that both nanoparticles show similar low cell toxicity. PS-CaP can be used as a better nonviral transfection vector compared with classical calcium phosphate.


Jenkins S.,Hunan Normal University
International Journal of Quantum Chemistry | Year: 2013

The need to make more quantitative use of the total electronic charge density distribution is demonstrated in this short perspective. This is framed in the perspective of the ground breaking early work of Bader and coworkers, along with mathematicians who captured the essential nature of a molecule in a suitably compact form in real space. We see that this simple form is the Poincaré-Hopf relation for molecules and clusters and the Euler-Hopf relation in solids. Thom's theory of elementary catastrophes combined with the Poincaré-Hopf relation provides the inspiration for the new quantum topology. An alternative use of the Poincaré-Hopf relation, molecular recognition, is discussed. Quantum topology is then used to create a topology phase diagram for both molecules and solids. The author adds their perspectives of the huge potential of the quantum topology approach by demonstrating the ease with which new theoretical ideas can be generated. © 2013 Wiley Periodicals, Inc.


Zhong X.-H.,Hunan Normal University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2010

The strong decay properties of the newly observed D(2550), D(2600), D(2750), and D(2760) are studied in a constituent quark model. It is predicted that the D(2760) and D(2750) seem to be two overlapping resonances. The D(2760) could be identified as the 1D33 with JP=3⊃-, while the D(2750) is most likely to be the high-mass mixed state |1D2′ H (JP=2⊃-) via the 1D21-1D23 mixing. The D(2600) favors the low-mass mixed state |(SD) 1L (JP=1⊃-) via the 1D13-2S13 mixing. The D(2550) as the 2S01 assignment bears controversies for its too-broad width given in experiments. © 2010 The American Physical Society.


Zhang A.,Hunan Normal University
Nuclear Physics B | Year: 2015

We investigate the thermal Casimir effect of a massless scalar field for two parallel plates moving in the equatorial orbit in Kerr space-time. Under the assumption that the typical cavity size is much smaller than the orbital radius, proposed by Sorge, we deduce the analytical expression of the renormalized free energy in this curved space-time. We also get the analytical representation for the renormalized internal energy, and find that there is a thermal correction to the Casimir energy, which depends on the proper temperature and the proper geometrical parameters of the plates. The asymptotic behavior of the Casimir free energy, entropy and internal energy at low temperature is also investigated. © 2015 The Author.


Deng H.,Hunan Normal University
Mathematical and Computer Modelling | Year: 2012

The Wiener index W(G) of a connected graph G is the sum of distances between all pairs of vertices in G. In this paper, we first give the recurrences or explicit formulae for computing the Wiener indices of spiro and polyphenyl hexagonal chains, which are graphs of a class of unbranched multispiro molecules and polycyclic aromatic hydrocarbons, then we establish a relation between the Wiener indices of a spiro hexagonal chain and its corresponding polyphenyl hexagonal chain, and determine the extremal values and characterize the extremal graphs with respect to the Wiener index among all spiro and polyphenyl hexagonal chains with n hexagons, respectively. An interesting result shows that the average value of the Wiener indices with respect to the set of all such hexagonal chains is exactly the average value of the Wiener indices of three special hexagonal chains, and is just the Wiener index of the meta-chain. © 2011 Elsevier Ltd.


Jing J.,Hunan Normal University
Journal of High Energy Physics | Year: 2011

With the Sturm-Liouville analytical and numerical methods, we investigate the behaviors of the holographic superconductors by introducing a complex charged scalar field coupled with a Power-Maxwell field in the background of d-dimensional Schwarzschild AdS black hole. We note that the Power-Maxwell field takes the special asymptotical solution near boundary which is different from all known cases. We find that the larger power parameter q for the Power-Maxwell field makes it harder for the scalar hair to be condensated. We also find that, for different q, the critical exponent of the system is still 1/2, which seems to be an universal property for various nonlinear electrodynamics if the scalar field takes the form of this paper. © 2011 SISSA.


Jing J.,Hunan Normal University | Chen S.,Hunan Normal University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2010

We study the effects of the Born-Infeld electrodynamics on the holographic superconductors in the background of a Schwarzschild-AdS black hole spacetime. We find that the presence of Born-Infeld scale parameter decreases the critical temperature and the ratio of the gap frequency in conductivity to the critical temperature for the condensates. Our results mean that it is harder for the scalar condensation to form in the Born-Infeld electrodynamics. © 2010 Elsevier B.V. All rights reserved.

Loading Hunan Normal University collaborators
Loading Hunan Normal University collaborators