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Chen SG, Zhang BY, Yang ZW, Gong WJ. Anomalous Klein tunneling in two-dimensional black phosphorus heterojunctions. Phys Chem Chem Phys 2023; 25:23836-23846. [PMID: 37641860 DOI: 10.1039/d3cp03161f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/31/2023]
Abstract
We investigate the role of heterojunctions of few-layer black phosphorus (BP) with band gap inversion in governing the quantum transport behaviors. Numerical results show that in the armchair junction, electron tunneling probability occurs under approximately normal incidence with its magnitude T > 0.5. More interestingly, when different band gaps are taken into account on two sides of this junction, the maximum transmission appears away from the center of the valley, leading to the occurrence of anomalous Klein tunneling. Such a result tends to be independent of the width and height of the potential barrier. On the other hand, in the zigzag junction, electron transmission arises in a larger range of angles, and perfect electron transmission (T = 1.0) or reflection appears under specific band gap configurations. These findings provide a new understanding for the study of Klein tunneling and anomalous Klein tunneling based on tunable band gap BP or other two-dimensional Dirac semimetals.
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Affiliation(s)
- Shu-Gang Chen
- College of Sciences, Northeastern University, Shenyang 110819, China.
| | - Bin-Yuan Zhang
- College of Sciences, Northeastern University, Shenyang 110819, China.
| | - Zi-Wei Yang
- College of Sciences, Northeastern University, Shenyang 110819, China.
| | - Wei-Jiang Gong
- College of Sciences, Northeastern University, Shenyang 110819, China.
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2
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Tian YP, Wang CB, Gong WJ. Arsenene as a promising sensor for the detection of H 2S: a first-principles study. RSC Adv 2023; 13:2234-2247. [PMID: 36741134 PMCID: PMC9835076 DOI: 10.1039/d2ra06588f] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 01/03/2023] [Indexed: 01/15/2023] Open
Abstract
To explore the feasibility of arsenene in detecting H2S gas, we employ the density-functional theory to investigate the geometry, electronic structure and magnetic properties of defected and doped arsenene. Point defects do not appreciably improve the sensing performance of arsenene due to small adsorption energies and charge transfer. The doping of transition metals (Ti, V, Cr, Mn, Co and Ni) introduces magnetic moments and narrows the band gap of arsenene. Transition metal (TM) dopants can enhance the interaction between H2S and a modified arsenene substrate. Adsorption energies and charge transfers increase significantly, and the adsorption converts to chemisorption. After adsorption, the Ti and Cr-doped system's band gap change is twice that of the pristine and defective arsenene. The adsorption of H2S changes the system properties of two TM-doped arsenenes: Ti-doped arsenene transforms from semiconductor to half-metal, and Ni-doped arsenene transforms from half-metal to conductor. Electrical signals can be observed in this process to detect H2S molecules. Our calculations show that doping improves the detecting performance of arsenene to H2S molecules more efficiently than defects. Our results indicate that arsenene has a promising future in developing H2S gas sensors.
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Affiliation(s)
- Yu-Ping Tian
- College of Sciences, Northeastern UniversityShenyang 110819China
| | - Chao-Bo Wang
- College of Sciences, Northeastern UniversityShenyang 110819China
| | - Wei-Jiang Gong
- College of Sciences, Northeastern UniversityShenyang 110819China
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3
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Dai QQ, Shao QS, Jiang ML, Chen BC, Gong WJ. [Efficacy of Altemeier operation combined with autogenous anal sphincter constriction in 40 patients with degree II and III rectal prolapse and anal loosening]. Zhonghua Wei Chang Wai Ke Za Zhi 2021; 24:1116-1118. [PMID: 34923799 DOI: 10.3760/cma.j.cn441530-20200615-00359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
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4
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Yu GN, Yi GY, Cui WB, Zhang LL, Li XS, Gong WJ. Quantum transmission through the n-p-n heterojunction of massive 8- Pmmnborophene. J Phys Condens Matter 2021; 34:085401. [PMID: 34787103 DOI: 10.1088/1361-648x/ac3a46] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Accepted: 11/16/2021] [Indexed: 06/13/2023]
Abstract
We investigate the quantum transmission through the n-p-n heterojunction of massive 8-Pmmnborophene. It is found that the Dirac mass of the electron interacts nontrivially with the anisotropy of the 8-Pmmnborophene, leading to the occurrence of new transmission behaviors in this n-p-n heterojunction. Firstly, the effective energy range of nonzero transmission can be reduced but deviates from the mass amplitude, which induces the further controllability of the transmission property. Secondly, even if the equal-energy surfaces in the p and n parts do not encounter in thek-space, finite transmission is allowed to occur as well. In addition, the existence of Dirac mass can change the reflection manner from the retroreflection to the specular reflection under appropriate conditions. The findings in this work can be helpful in describing the quantum transport properties of the heterojunction based on 8-Pmmnborophene.
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Affiliation(s)
- Guo-Na Yu
- College of Sciences, Northeastern University, Shenyang 110819, People's Republic of China
| | - Guang-Yu Yi
- College of Sciences, Northeastern University, Shenyang 110819, People's Republic of China
| | - Wei-Bin Cui
- State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, People's Republic of China
| | - Lian-Lian Zhang
- College of Sciences, Northeastern University, Shenyang 110819, People's Republic of China
| | - Xue-Si Li
- College of Sciences, Northeastern University, Shenyang 110819, People's Republic of China
| | - Wei-Jiang Gong
- College of Sciences, Northeastern University, Shenyang 110819, People's Republic of China
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Gong T, Dai XF, Zhang LL, Jiang C, Gong WJ. Interference effect on the Andreev reflections induced by Majorana bound states. J Phys Condens Matter 2021; 33:215303. [PMID: 33588382 DOI: 10.1088/1361-648x/abe651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 02/15/2021] [Indexed: 06/12/2023]
Abstract
We investigate the effect of quantum interference on the Andreev reflections (ARs) induced by Majorana bound states (MBSs), by considering their additional coupling via a quantum-dot molecule. It is found that due to the direct and indirect couplings of MBSs, a quantum ring is constructed in this system. Consequently, the interference effect makes important contribution to the ARs, especially in the presence of the local magnetic flux. All the results are manifested as the tight dependence of the differential conductance and Fano factors on the magnetic flux phase factor, dot-MBS couplings, and the dot level, respectively. Moreover, at the zero-bias limit, the magnitudes of the Fano factors and their relation can be efficiently altered by the interference properties. We believe that quantum interference is important for manipulating the Andreev reflection behaviors of the MBSs.
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Affiliation(s)
- Tong Gong
- College of Sciences, Northeastern University, Shenyang 110819, People's Republic of China
| | - Xue-Feng Dai
- College of Sciences, Northeastern University, Shenyang 110819, People's Republic of China
| | - Lian-Lian Zhang
- College of Sciences, Northeastern University, Shenyang 110819, People's Republic of China
| | - Cui Jiang
- Basic Department, Shenyang Institute of Engineering, Shenyang, 110136, People's Republic of China
| | - Wei-Jiang Gong
- College of Sciences, Northeastern University, Shenyang 110819, People's Republic of China
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Jin Z, Gong WJ, Zhu AD, Zhang S, Qi Y, Su SL. Dissipative preparation of qutrit entanglement via periodically modulated Rydberg double antiblockade. Opt Express 2021; 29:10117-10133. [PMID: 33820145 DOI: 10.1364/oe.419568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 03/08/2021] [Indexed: 06/12/2023]
Abstract
We propose a mechanism of Rydberg double antiblockade by virtue of a resonant dipole-dipole interaction between a pair of Rydberg atoms placed at short distances scaling as 1/R3. By combining this novel excitation regime with microwave-driven fields and dissipative dynamics, a stationary qutrit entangled state can be obtained with high quality, the corresponding steady-state fidelity and purity are insensitive to the variations of the dynamical parameters. Furthermore, we introduce time-dependent laser fields with periodically modulated amplitude to speed up the entanglement creation process. Numerical simulations reveal that the order of magnitude of the shortened convergence time is about 103 in units of ω0, and the acceleration effect appears valid in broad parametric space. The present results enrich the physics of the Rydberg antiblockade regimes and may receive more attention for the experimental investigations in dissipative dynamics of neutral atoms.
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Zhang SF, Gong WJ. Interference effect in the electronic transport of a topological insulator quantum dot. J Phys Condens Matter 2021; 33:135301. [PMID: 33412526 DOI: 10.1088/1361-648x/abd99e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2020] [Accepted: 01/07/2021] [Indexed: 06/12/2023]
Abstract
Edge and bulk energy levels can coexist in a quantum dot (QD) made of a topological insulator. Interference effect will occur between bulk and edge levels and also between degenerate edge levels. It can be observed in the transport behavior. For the former, it acts as Fano interference with edge and bulk levels contributing continuous and resonant transport channels, respectively. Generally speaking, Fano interference can be realized in a two-armed junction with a single QD or a one-armed junction with at least two QDs. But here it is realized in a one-armed junction with a single QD. As for the interference between degenerate edge levels, it leads to a spin and space dependent scattering process. Spin of an incident electron will either be conserved or rotate about an axis for transmitting into different leads. It is determined by the local spin polarization of edge levels and the accumulated phase in transport paths in the QD. It may be used in the design of a spin field-effect transistor.
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Affiliation(s)
- Shu-Feng Zhang
- School of Physics and Technology, University of Jinan, Jinan, Shandong 250022, People's Republic of China
| | - Wei-Jiang Gong
- College of Sciences, Northeastern University, Shenyang, Liaoning 110819, People's Republic of China
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Wu BH, Hassan SA, Gong WJ, Xu XF, Wang CR, Cao JC. Theoretical investigation of the scanning tunneling microscopy of Majorana bound states in topological superconductor vortices. J Phys Condens Matter 2021; 33:025301. [PMID: 33055367 DOI: 10.1088/1361-648x/abb546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Scanning tunneling microscopy (STM) is an indispensable tool in detecting Majorana bound states (MBSs) in vortices of topological superconductors. By reducing the computational complexity via non-uniform grids, we systematically study the tunnel coupling as well as the temperature dependence of the differential conductance of MBSs in two dimensional devices. Numerical results show that the conductance peak approaches the quantized value 2e 2/h in strong coupling limit at low temperatures which are characteristic features of MBSs. More interestingly, a conductance local minimum in the spatially scanning is observed when the STM tip is placed at the vortex center. The dip structure can be enhanced with increased temperature or enlarged vortex size. We ascribe this observation to the sensitivity of the Andreev reflection processes of carriers at the vortex center where the thermal energy could be comparable to the vanishing pair potential. We also investigate the STM of two-vortex systems where the hybridization of the vortices can lead to oscillatory behavior of the state energy. With small inter-vortex distances, the original MBSs in vortices can merge into topologically trivial states and the conductance peak can be significantly suppressed.
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Affiliation(s)
- B H Wu
- Department of Applied Physics, Donghua University, 2999 North Renmin Road, Shanghai, 201620, People's Republic of China
| | - S A Hassan
- Department of Applied Physics, Donghua University, 2999 North Renmin Road, Shanghai, 201620, People's Republic of China
| | - W J Gong
- College of Sciences, Northeastern University, NO. 3-11, Wenhua Road, Shenyang 110004, People's Republic of China
| | - X F Xu
- Department of Applied Physics, Donghua University, 2999 North Renmin Road, Shanghai, 201620, People's Republic of China
| | - C R Wang
- Department of Applied Physics, Donghua University, 2999 North Renmin Road, Shanghai, 201620, People's Republic of China
| | - J C Cao
- Key Laboratory of Terahertz Solid-State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, People's Republic of China
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Xu TT, Gong WJ, Zhang LL, Qi Y. Frustrated nonsequential double ionization of Ar atoms in counter-rotating two-color circular laser fields. Opt Express 2020; 28:35168-35178. [PMID: 33182968 DOI: 10.1364/oe.409495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Accepted: 10/27/2020] [Indexed: 06/11/2023]
Abstract
We theoretically investigate the frustrated double ionization (FDI) of Ar atoms with counter-rotating two-color circular (CRTC) laser fields using the three-dimensional (3D) classical ensemble method. Our results show that the FDI probability depends upon the intensity ratio of the CRTC laser fields. The FDI event accompanied with the recollision excitation with subsequent ionization is prevalent and three pathways exist in FDI processes driven by CRTC laser fields. The momentum distribution of a recaptured electron at the ionization time after recollision indicates that the momentum being close to the vector potential is a necessary condition for FDI events to occur. In addition, the recaptured electron most probably transitions to a Rydberg state of which the quantum number is ten in the CRTC fields.
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Li XS, Li ZZ, Zhang LL, Gong WJ. [Formula: see text] symmetry of the Su-Schrieffer-Heeger model with imaginary boundary potentials and next-nearest-neighboring coupling. J Phys Condens Matter 2020; 32:165401. [PMID: 31846955 DOI: 10.1088/1361-648x/ab62bd] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
By introducing the next-nearest-neighboring (NNN) intersite coupling, we investigate the eigenenergies of the [Formula: see text]-symmetric non-Hermitian Su-Schrieffer-Heeger (SSH) model with two conjugated imaginary potentials at the end sites. It is found that with the strengthening of NNN coupling, the particle-hole symmetry is destroyed. As a result, the bonding band is first narrowed and then undergoes the top-bottom reversal followed by the its width's increase, whereas the antibonding band is widened monotonously. In this process, the topological state extends into the topologically-trivial region, and its energy departs from the energy zero point, accompanied by the emergence of one new topological state in this region. All these results give rise to the complication of the topological properties and the manner of [Formula: see text]-symmetry breaking. It can be concluded that the NNN coupling takes important effects to the change of the topological properties of the non-Hermitian SSH system.
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Affiliation(s)
- Xue-Si Li
- College of Sciences, Northeastern University, Shenyang 110819, People's Republic of China
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Li XS, Huang PP, He J, Zhang LL, Gong WJ. Fano effect in a one-dimensional photonic lattice with side-coupled P T-symmetric non-Hermitian defects. Opt Express 2020; 28:8560-8573. [PMID: 32225478 DOI: 10.1364/oe.383301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Accepted: 02/06/2020] [Indexed: 06/10/2023]
Abstract
We theoretically study the transport properties in a one-dimensional photonic lattice influenced by the presence of side-coupled P T-symmetric non-Hermitian defects. The P T symmetry is manifested as the complex potentials on the defects and the complex defect-lattice couplings, respectively. These two mechanisms are found to induce the Fano effect in the transport processes, with the different characteristics of it. Next, if the complex potentials and defect-lattice couplings co-exist, the Fano effect will be achieved more efficiently. However, further enhancing either of them can weaken the Fano interference seriously. Our findings reveal the physical essence of the Fano effect on the P T-symmetric non-Hermitian defects, and the results can provide insights into the engineering and dynamical control of Fano resonances in non-Hermitian photonic structures.
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Zhang Y, He J, Gong WJ. Roles of quantum interference in modulating the spin-polarized transport induced by single-helical molecules. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.136596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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13
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Wang XQ, Zhang SF, Wang Q, Jiang C, Gong WJ. Signatures of Majorana doublet in the Fano-Rashba interferometer. J Phys Condens Matter 2019; 31:305303. [PMID: 31018184 DOI: 10.1088/1361-648x/ab1bee] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We theoretically study the quantum transport through a Fano-Rashba interferometer with an embedded Majorana doublet which generates at one end of the DIII-class topological superconductor. It shows that the Rasbha spin-orbit interaction in the reference arm drives the apparent and terminal-dependence spin polarization of the electron tunneling and crossed Andreev reflection, accompanied by their opposite directions. However, spin degeneracy holds in the local Andreev reflection. Next once the Majorana doublet is replaced by the Andreev bound state, the spin-polarization properties of the Andreev reflections are interchanged. Therefore, the Fano-Rashba interferometer can be a promising candidate for differentiating the Majorana doublet from other bound states.
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Affiliation(s)
- Xiao-Qi Wang
- College of Sciences, Northeastern University, Shenyang 110819, People's Republic of China
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Wu BH, Gong WJ, Xu XF, Wang CR, Cao JC. Quantum interference of Josephson current in topological Anderson insulator junctions. J Phys Condens Matter 2019; 31:285301. [PMID: 30947149 DOI: 10.1088/1361-648x/ab162e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We investigate the critical supercurrent in Josephson junctions consisting of topological Anderson insulators (TAIs) via the Matsubara Green's function formalism. Our numerical results show that the disorder-induced edge states display distinct differences in dominating normal and supercurrent transport in the TAI phase. Unlike the hallmark of the TAI phase which exhibits a quantized conductance plateau, the critical supercurrent over the disorder strength exhibits a peak structure where the maximum value is reached at the weak-disorder boundary of the TAI phase. Although the magnitude of the averaged critical supercurrent is suppressed with increasing disorder strength, periodic oscillations of the supercurrent on an external magnetic flux survive in the TAI phase. These findings indicate that the supercurrent quantum interference effect can be an effective probe in detecting the emergence of disorder-induced edge state in TAIs.
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Affiliation(s)
- B H Wu
- Department of Applied Physics, Donghua University, 2999 North Renmin Road, Shanghai 201620, People's Republic of China
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Am JU, Gong WJ, Su Y, Mou ZB. Imperatorin shows selective antitumor effects in SGC-7901 human gastric adenocarcinoma cells by inducing apoptosis, cell cycle arrest and targeting PI3K/Akt/m-TOR signalling pathway. J BUON 2017; 22:1471-1476. [PMID: 29332340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
PURPOSE The main purpose of the present study was to determine the anticancer properties of imperatorin - a naturally occurring coumarin compound - against SGC-7901 human gastric adenocarcinoma cells and the mouse fibroblast cell line 3T3 (normal cell line). METHODS Imperatorin effects on apoptosis induction, cell cycle phase distribution and PI3K/Akt/m-TOR signalling pathways were studied. MTT cell viability assay examined the compound's cytotoxic potential, while inverted phase contrast microscopy and fluorescence microscopy techniques were used to study morphological changes induced in SGC-7901 cells by imperatorin. Flow cytometry examined its effects on cell cycle progression while Western blot assay was used to study changes in protein expressions of PI3K/Akt/m-TOR pathway. RESULTS Imperatorin induced a dose-dependent growth inhibition of the SGC-7901 gastric cancer cells with an IC50 value 62.6 μM, while in case of normal 3T3 mouse fibroblast cells, the drug did not show significant toxicity (IC50 value 195.8 μM), indicating that the drug selectively induced cytotoxicity in gastric cancer cells. The cells became rounded up, shrunken in size and got detached from the monolayer attached to well surface. Cells treated with 10, 75 and 175 μM imperatorin indicated that they began to emit yellow or red fluorescence which is an indication of early or late apoptosis respectively. Imperatorin also induced significant DNA fragmentation along with increasing the fraction of sub-G1 cells, indicating a sub-G1 cell cycle arrest. CONCLUSION Imperatorin could prove an important lead molecule for the treatment of gastric cancer and deserves further research in vivo against more cell lines.
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Affiliation(s)
- J U Am
- Department of Gastroenterology, Yantai Yuhuangding Hospital, Yantai, 264000, Shandong, P.R. China
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Fan CL, Luo JY, Gong WJ, Liu XQ, Zhou SJ, Zhang FF, Zeng J, Li HX, Feng N. [Nested case-control study on associated factors for anemia during pregnancy]. Zhonghua Liu Xing Bing Xue Za Zhi 2017; 38:1269-1273. [PMID: 28910945 DOI: 10.3760/cma.j.issn.0254-6450.2017.09.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To explore the related factors of anemia during pregnancy and provide scientific evidence for the primary prevention of anemia during pregnancy. Methods: The pregnant women (≤12 pregnant weeks) who received the first pregnancy care in a local medical institution in Hunan province from June 2013 to November 2014 were included in this cohort study, and for them anemia had been excluded by physical examination. Baseline survey and follow up till childbirth were conducted for them. A queue-based nested case-control study (1 ∶ 2) was conducted (380 pregnant women with anemia detected in this study as case group, 760 pregnant women without anemia randomly selected and matched by age, habitual residence during pregnancy as control group. And t test, χ(2) test and logistic regression analysis were conducted to identify related factors of anemia during pregnancy. Results: Multivariate logistic regression analysis indicated that low family annual income level (net income) (OR=2.08, 95%CI: 1.22-3.59), low educational level (OR=2.09, 95%CI: 1.22-3.59), pre-pregnancy perm/hair dye (OR=2.23, 95%CI: 1.63-3.05), early pregnancy vomiting (OR=2.51, 95%CI: 1.56-4.03) were the risk factors for anemia during pregnancy. Intake of vitamin and trace element supplements (OR=0.69, 95%CI: 0.50-0.94), frequent meat, fish, shrimp, egg intakes (OR=0.68, 95%CI: 0.49-0.92), frequent soy milk, milk intakes (OR=0.51, 95%CI: 0.27-0.95) were the protective factors for anemia during pregnancy. Conclusion: A number of factors, such as family annual income level, education level, poisonous and harmful material contact, pregnancy reaction, nutrition, are related to the incidence of anemia during pregnancy, it is necessary to take preventive measures to reduce the incidence of anemia during pregnancy.
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Affiliation(s)
- C L Fan
- Department of Maternal and Child Health, School of Public Health, Central South University, Changsha 410078, China
| | - J Y Luo
- Department of Maternal and Child Health, School of Public Health, Central South University, Changsha 410078, China
| | - W J Gong
- Department of Maternal and Child Health, School of Public Health, Central South University, Changsha 410078, China
| | - X Q Liu
- Department of Maternal and Child Health, School of Public Health, Central South University, Changsha 410078, China
| | - S J Zhou
- Liuyang County Women and Children Health Center, Liuyang 410300, China
| | - F F Zhang
- Liuyang County Women and Children Health Center, Liuyang 410300, China
| | - J Zeng
- Liuyang County Women and Children Health Center, Liuyang 410300, China
| | - H X Li
- Women and Children Health Center of Hunan Province, Changsha 410078, China
| | - N Feng
- Women and Children Health Center of Hunan Province, Changsha 410078, China
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Wang X, Wu HN, Gong WJ. Spin-polarized transport through a quantum ring with an embedded protein-like single-helical molecule. J Chem Phys 2017; 146:165101. [DOI: 10.1063/1.4982052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Xiao Wang
- College of Sciences, Northeastern University, Shenyang 110819, China
| | - Hai-Na Wu
- College of Sciences, Northeastern University, Shenyang 110819, China
| | - Wei-Jiang Gong
- College of Sciences, Northeastern University, Shenyang 110819, China
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Gao Z, Wang XQ, Shan WF, Wu HN, Gong WJ. Josephson effects in the junction formed by DIII-class topological and s-wave superconductors with an embedded quantum dot. Sci Rep 2016; 6:28311. [PMID: 27324426 PMCID: PMC4915010 DOI: 10.1038/srep28311] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 05/31/2016] [Indexed: 11/09/2022] Open
Abstract
We investigate the Josephson effects in the junction formed by the indirect coupling between DIII-class topological and s-wave superconductors via an embedded quantum dot. Due to the presence of two kinds of superconductors, three dot-superconductor coupling manners are considered, respectively. As a result, the Josephson current is found to oscillate in period 2π. More importantly, the presence of Majorana doublet in the DIII-class superconductor renders the current finite at the case of zero phase difference, with its sign determined by the fermion parity of such a junction. In addition, the dot-superconductor coupling plays a nontrivial role in adjusting the Josephson current. When the s-wave superconductor couples to the dot in the weak limit, the current direction will have an opportunity to reverse. It is believed that these results will be helpful for understanding the transport properties of the DIII-class superconductor.
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Affiliation(s)
- Zhen Gao
- College of Sciences, Northeastern University, Shenyang 110819, China
| | - Xiao-Qi Wang
- College of Sciences, Northeastern University, Shenyang 110819, China
| | - Wan-Fei Shan
- College of Sciences, Northeastern University, Shenyang 110819, China
| | - Hai-Na Wu
- College of Sciences, Northeastern University, Shenyang 110819, China
| | - Wei-Jiang Gong
- College of Sciences, Northeastern University, Shenyang 110819, China
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Gong WJ, Sui XY, Wang Y, Yu GD, Chen XH. Fano effect and bound state in continuum in electron transport through an armchair graphene nanoribbon with line defect. Nanoscale Res Lett 2013; 8:330. [PMID: 23870061 PMCID: PMC3720541 DOI: 10.1186/1556-276x-8-330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/01/2013] [Accepted: 07/05/2013] [Indexed: 06/02/2023]
Abstract
: Electron transport properties in an armchair graphene nanoribbon are theoretically investigated by considering the presence of line defect. It is found that the line defect causes the abundant Fano effects and bound state in continuum (BIC) in the electron transport process, which are tightly dependent on the width of the nanoribbon. By plotting the spectra of the density of electron states of the line defect, we see that the line defect induces some localized quantum states around the Dirac point and that the different localizations of these states lead to these two kinds of transport results. Next, the Fano effect and BIC phenomenon are detailedly described via the analysis about the influence of the structure parameters. According to the numerical results, we propose such a structure to be a promising candidate for graphene nanoswitch. PACS: 81.05.Uw, 71.55.-i, 73.23.-b, 73.25.+i.
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Affiliation(s)
- Wei-Jiang Gong
- College of Sciences, Northeastern University, Shenyang 110004, China
| | - Xiao-Yan Sui
- College of Sciences, Northeastern University, Shenyang 110004, China
| | - Yan Wang
- College of Sciences, Northeastern University, Shenyang 110004, China
| | - Guo-Dong Yu
- Department of Physics, Jilin University, Changchun 130023, China
| | - Xiao-Hui Chen
- College of Sciences, Northeastern University, Shenyang 110004, China
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Gong WJ, Han Y, Wei GZ, Du A. Spin accumulation assisted by the Aharonov-Bohm-Fano effect of quantum dot structures. Nanoscale Res Lett 2012; 7:510. [PMID: 22985404 PMCID: PMC3564718 DOI: 10.1186/1556-276x-7-510] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2012] [Accepted: 07/20/2012] [Indexed: 06/01/2023]
Abstract
: We investigate the spin accumulations of Aharonov-Bohm interferometers with embedded quantum dots by considering spin bias in the leads. It is found that regardless of the interferometer configurations, the spin accumulations are closely determined by their quantum interference features. This is mainly manifested in the dependence of spin accumulations on the threaded magnetic flux and the nonresonant transmission process. Namely, the Aharonov-Bohm-Fano effect is a necessary condition to achieve the spin accumulation in the quantum dot of the resonant channel. Further analysis showed that in the double-dot interferometer, the spin accumulation can be detailedly manipulated. The spin accumulation properties of such structures offer a new scheme of spin manipulation. When the intradot Coulomb interactions are taken into account, we find that the electron interactions are advantageous to the spin accumulation in the resonant channel.
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Affiliation(s)
- Wei-Jiang Gong
- College of Sciences, Northeastern University, Shenyang, 110819, China
- International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang, 110016, China
| | - Yu Han
- Department of Physics, Liaoning University, Shenyang, 110036, China
| | - Guo-Zhu Wei
- College of Sciences, Northeastern University, Shenyang, 110819, China
- International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang, 110016, China
| | - An Du
- College of Sciences, Northeastern University, Shenyang, 110819, China
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Chen HY, Zhang Q, Yin CC, Wang CK, Gong WJ, Mei G. Detection of Quantitative Trait Loci Affecting Milk Production Traits on Bovine Chromosome 6 in a Chinese Holstein Population by the Daughter Design. J Dairy Sci 2006; 89:782-90. [PMID: 16428646 DOI: 10.3168/jds.s0022-0302(06)72140-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Fourteen microsatellite markers with a coverage of 63.5 cM on bovine chromosome 6 were selected, and 26 sire families with 2,260 daughters were analyzed for mapping quantitative trait loci (QTL) affecting 5 milk production traits in a Chinese Holstein population. In the analyses across 26 families and within the largest significant families with a one-QTL model fitted, a QTL near BMS470 was detected that affected fat yield at the 5% experiment-wide significance level. When a 2-QTL model was fitted in the across-family analysis, it was found that there might exist 2 QTL affecting the 3 yield traits, although the exact or empirical thresholds for the significance testing were unknown. In all analyses, the results for milk yield and protein yield were generally consistent, which might have resulted from the same genetic background for milk and protein yield.
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Affiliation(s)
- H Y Chen
- State Key Laboratory for Agrobiotechnology, Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing 100094, China
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