185 results on '"Su, Cong"'
Search Results
152. Tailoring Exciton Dynamics by Elastic Strain-Gradient in Semiconductors
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Fu, Xuewen, primary, Su, Cong, additional, Fu, Qiang, additional, Zhu, Xinli, additional, Zhu, Rui, additional, Liu, Chuanpu, additional, Liao, Zhimin, additional, Xu, Jun, additional, Guo, Wanlin, additional, Feng, Ji, additional, Li, Ju, additional, and Yu, Dapeng, additional
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- 2014
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153. Dielectric properties and crystal structure of (1 − y)(Mg0.95Ni0.05)4Ta2O9–y(Ca0.8Sr0.2)TiO3 ceramics
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LI, Bing-Jing, primary, WANG, Sih-Yin, additional, SU, Cong-Zhi, additional, and CHEN, Yuan-Bin, additional
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- 2014
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154. A Study on Planning and Construction of New Rural Communities
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Su, Cong Cong, primary
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- 2013
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155. Investigation on Seismic Performance of Self-Built House in Henan Rural Areas
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Su, Cong Cong, primary
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- 2013
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156. Study on Interaction Land Use and Road Traffic of Zhongyuan Urban Agglomerations
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Li, Li Hui, primary and Su, Cong Cong, additional
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- 2013
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157. Two-dimensional carbon allotrope with strong electronic anisotropy
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Su, Cong, primary, Jiang, Hua, additional, and Feng, Ji, additional
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- 2013
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158. Friction and Adhesion Properties of OTS Film on Rough Surfaces
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Horng, Jeng Haur, primary, Chern, Shin Yuh, additional, Su, Cong Ren, additional, and Wang, Bo Sheng, additional
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- 2013
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159. Research on controllable damping technology and simulation of hybrid machine tool
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Zhu, Lida, primary, Zhu, Chunxia, additional, Su, Cong, additional, Li, Gang, additional, Yang, Jianyu, additional, and Wang, Wanshan, additional
- Published
- 2009
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160. Effect of Defect Characteristics on the Color of BaTiO3-Based PTC Ceramic
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Yang, Ai Mei, Deng, Jian Ming, Su, Cong Xue, Jia, Wen Hao, and Liu, Lai Jun
- Abstract
The barium titanium based PTC ceramic with two kind of colors, light blue and yellow, were obtained by changing sintering processing. In order to reveal the relationship between color and electrical properties of the ceramics. The phase structure and microstructure of as synthesized samples were investigated by powder X-ray diffraction (XRD) and scanning electron microscopic (SEM) analysis. The micro area elements were characterized by electron probe micro-analyzer (EPMA) and x-ray photoelectron spectrometer (XPS). The thermo-sensitive properties were studied by resistance-temperature measurement system. The results reveal that two kinds of PTC ceramics have the same structure, similar elements, but different microstructure and valence concentration of titanium. It is suggested that difference of color of the PTC ceramics are originated from the defect concentration of titanium.
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- 2016
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161. Evolution of nanopores in hexagonal boron nitride.
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Dai, Chunhui, Popple, Derek, Su, Cong, Park, Ji-Hoon, Watanabe, Kenji, Taniguchi, Takashi, Kong, Jing, and Zettl, Alex
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BORON nitride , *NANOPORES , *TRANSMISSION electron microscopy , *DNA sequencing , *ATOMIC structure , *CHEMICAL stability - Abstract
The engineering of atomically-precise nanopores in two-dimensional materials presents exciting opportunities for both fundamental science studies as well as applications in energy, DNA sequencing, and quantum information technologies. The exceptional chemical and thermal stability of hexagonal boron nitride (h-BN) suggest that exposed h-BN nanopores will retain their atomic structure even when subjected to extended periods of time in gas or liquid environments. Here we employ transmission electron microscopy to examine the time evolution of h-BN nanopores in vacuum and in air and find, even at room temperature, dramatic geometry changes due to atom motion and edge contamination adsorption, for timescales ranging from one hour to one week. The discovery of nanopore evolution contrasts with general expectations and has profound implications for nanopore applications of two-dimensional materials. Nanopore engineering holds great promise for energy, DNA sequencing, and quantum information technologies, but pore evolution, particularly in presumably stable materials such as boron nitride, is largely unexplored. Here, the authors use high-resolution transmission electron microscopy to show that different nanopores formed in mono- and multi-layer hexagonal boron nitride are stable in vacuum but undergo dramatic changes in air. [ABSTRACT FROM AUTHOR]
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- 2023
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162. Study on Decolorization of Methyl Orange Dye Wastewater by DC Stream Discharge with MgO-CuO-Al2O3 Catalyst
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Xie, Hong Duan, Su, Cong, Wang, Chun Yu, Wang, Li Duo, Liu, Sheng Hou, Zhang, Xiao Yin, and Liu, Nan
- Abstract
The decolorization of methyl orange wastewater by DC stream discharge with MgO-CuO-Al
2 O3 catalyst was investigated. The removal efficiency was studied for different experimental parameters. Results showed that the removal efficiency by discharge with catalyst was better than discharge only. The removal efficiency was 98% under the condition of applied voltage 18kV, current 9mA, volume of catalyst 20cm3 , initial concentration 40mg/L with treatment for 10min. The intensity of methyl orange absorption peak (465nm) gradually weakened and disappeared by discharge with catalyst, the conjugated system composed of azo group and benzene in the molecular structure was destroyed, methyl orange molecules were degraded effectively.- Published
- 2014
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163. The role of body composition in left ventricular remodeling, reverse remodeling, and clinical outcomes for heart failure with mildly reduced ejection fraction: more knowledge to the "obesity paradox".
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Fu, Kang, Dong, Youran, Wang, Zhiyuan, Teng, Junlin, Cheng, Congyi, Su, Cong, Ji, Xiaoping, and Lu, Huixia
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ADIPOSE tissues , *BODY mass index , *LEAN body mass , *BODY composition , *OBESITY paradox - Abstract
Background: Although the "obesity paradox" is comprehensively elucidated in heart failure (HF) with reduced ejection fraction (HFrEF) and HF with preserved ejection fraction (HFpEF), the role of body composition in left ventricular (LV) remodeling, LV reverse remodeling (LVRR), and clinical outcomes is still unclear for HF with mildly reduced ejection fraction (HFmrEF). Methods: Our study is a single-centre, prospective, and echocardiography-based study. Consecutive HFmrEF patients, defined as HF patients with a left ventricular ejection fraction (LVEF) between 40 and 49%, between January 2016 to December 2021 were included. Echocardiography was re-examined at 3-, 6-, and 12-month follow-up to assess the LVRR dynamically. Body mass index (BMI), fat mass, fat-free mass, percent body fat (PBF), CUN-BAE index, and lean mass index (LMI) were adopted as anthropometric parameters in our study to assess body composition. The primary outcome was LVRR, defined as: (1) a reduction higher than 10% in LV end-diastolic diameter index (LVEDDI), or a LVEDDI < 33 mm/m2, (2) an absolute increase of LVEF higher than 10 points compared with baseline echocardiogram, or a follow-up LVEF ≥50%. The secondary outcome was a composite of re-hospitalization for HF or cardiovascular death. Results: A total of 240 HFmrEF patients were enrolled in our formal analysis. After 1-year follow-up based on echocardiography, 113 (47.1%) patients developed LVRR. Patients with LVRR had higher fat mass (21.7 kg vs. 19.3 kg, P = 0.034) and PBF (28.7% vs. 26.6%, P = 0.047) compared with those without. The negative correlation between anthropometric parameters and baseline LVEDDI was significant (all P < 0.05). HFmrEF patients with higher BMI, fat mass, PBF, CUN-BAE index, and LMI had more pronounced and persistent increase of LVEF and decline in LV mass index (LVMI). Univariable Cox regression analysis revealed that higher BMI (HR 1.042, 95% CI 1.002–1.083, P = 0.037) and fat mass (HR 1.019, 95% CI 1.002–1.036, P = 0.026) were each significantly associated with higher cumulative incidence of LVRR for HFmrEF patients, while this relationship vanished in the adjusted model. Mediation analysis indicated that the association between BMI and fat mass with LVRR was fully mediated by baseline LV dilation. Furthermore, higher fat mass (aHR 0.957, 95% CI 0.917–0.999, P = 0.049) and PBF (aHR 0.963, 95% CI 0.924–0.976, P = 0.043) was independently associated with lower risk of adverse clinical events. Conclusions: Body composition played an important role in the LVRR and clinical outcomes for HFmrEF. For HFmrEF patients, BMI and fat mass was positively associated with the cumulative incidence of LVRR, while higher fat mass and PBF predicted lower risk of adverse clinical events but not LMI. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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164. Correction to “Enhancement of van der Waals Interlayer Coupling through Polar Janus MoSSe”
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Zhang, Kunyan, Guo, Yunfan, Ji, Qingqing, Lu, Ang-Yu, Su, Cong, Wang, Hua, Puretzky, Alexander A., Geohegan, David B., Qian, Xiaofeng, Fang, Shiang, Kaxiras, Efthimios, Kong, Jing, and Huang, Shengxi
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- 2021
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165. The paradox of political ties on headquarters-subsidiary motives for knowledge transfer in Chinese multinationals: The importance of organizational distance
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Su, Cong, Kong, Lingshuang, Ciabuschi, Francesco, Holm, Ulf, Su, Cong, Kong, Lingshuang, Ciabuschi, Francesco, and Holm, Ulf
166. Conceptualizing political embeddedness: Relevance for state-owned enterprises and emerging-market firms
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Su, Cong and Su, Cong
167. The liability of political embeddedness in emerging-market multinationals: Effects on reverse knowledge transfer
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Su, Cong, Holm, Ulf, Martin Martin, Oscar, Su, Cong, Holm, Ulf, and Martin Martin, Oscar
168. Informal training in Chinese small- and medium-sized enterprises
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Bao, Chanzi, Suseno, Yuliani, Baimbridge, Mark, Su, Cong, Bao, Chanzi, Suseno, Yuliani, Baimbridge, Mark, and Su, Cong
- Abstract
Bao, C., Suseno, Y. , Baimbridge, M., & Su, C. (2014). Informal training in Chinese small- and medium-sized enterprises. Proceedings of Paris Colloquium and International Journal of Human Resource Management. (pp. 1-56). Paris, France. https://doi.org/10.1504/IJESB.2019.099879
169. MnO2 nanosheet-mediated generalist probe: Cancer-targeted dual-microRNAs detection and enhanced CDT/PDT synergistic therapy.
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Cheng, Simin, Shi, Ying, Su, Cong, Li, Ying, and Zhang, Xiaoru
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DNA probes , *REACTIVE oxygen species , *HYDROXYL group , *GLUTATHIONE , *PHOTODYNAMIC therapy , *NUCLEIC acids - Abstract
While integrated nanoplatform for diagnosis and therapy has received much recent interest, its widespread application has been hampered by the complicated preparation process, high-cost and low-efficacy. Herein, we designed a MnO 2 nanosheet-mediated generalist probe (MNSGP), for intracellular dual-microRNAs (miRNAs) imaging and enhanced synergistic therapy of chemodynamic therapy (CDT) and photodynamic therapy (PDT). Because MNSGP can specifically target nucleolin receptor overexpressed on the cancer cell surface, it can be internalized via a receptor-mediated endocytosis pathway. After entering the cells, MnO 2 NS was degraded to Mn2+ by the excessive glutathione (GSH), releasing the DNA probes for cyclic amplification detection of miR-155 and miR-21 based on toehold-mediated strand displacement amplification (TSDA). Meanwhile, the produced O 2 by MnO 2 NS catalysis can promote the photosensitizer TMPyP4 to produce singlet oxygen (1O 2) for PDT. The degraded Mn2+, as Fenton reagent, can convert endogenous H 2 O 2 to cytotoxic hydroxyl radical (·OH) for CDT. In addition, the depletion of GSH impairs the antioxidant defense system (ADS), enhancing the CDT/PDT synergistic effect. The prepared generalist probe was fully characterized. Accuracy of dual-miRNAs detection and the high curative effect of enhanced CDT/PDT synergistic therapy were attested via in vitro and in vivo experiments. Unarguably, MNSGP broadens new horizons in the design of nucleic acid nanoplatform, cancer-targeted detection and theranostic application. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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170. Defect evolution and effect on structure and electric properties of A/B site Sm doped BaTiO3 sintered in different atmospheres.
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Wang, Zhen, Hao, Hua, Peng, Feng, Zhang, Wanying, Su, Cong, Guo, Qinghu, Yao, Zhonghua, Cao, Minghe, and Liu, Hanxing
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ELECTRIC properties , *CERAMICS , *BARIUM titanate , *DIELECTRIC loss , *ELECTRIC insulators & insulation , *SPACE charge , *ELECTRON capture - Abstract
BaTiO 3 ceramics doped with different contents of Sm (0.5–7 mol%) are prepared by a homogeneous precipitation method and sintered in air (A- x Sm) and reducing (R- x Sm) atmosphere respectively. With the increase of doping amount, the phase structure of Sm-doped BaTiO 3 ceramics gradually changes from tetragonal phase to cubic phase, and the cubic phase is stronger in R- x Sm. In the air atmosphere, Sm ions preferentially replace Ba sites as donors at low doping concentration, which is easy to convert Ti4+ ions into Ti3+ ions, resulting high dielectric constant (>104) and semiconductor like properties. As the doping amount increases, Sm ions start to replace Ti sites as acceptors to generate oxygen vacancies, which capture the electrons generated by donor doping, thus decreasing the percentage of Ti3+ ions. As a result, the dielectric loss and permittivity are decreased, and the electrical insulation properties of A- x Sm ceramics are gradually improved. However, in the reducing atmosphere, oxygen atoms in the lattice are easy to escape, resulting in many oxygen vacancies and free electrons. The increase of oxygen vacancy inhibits the substitution of Sm ion to Ti site, and the free electron leads to the increase the percentage of Ti3+ ions and R- x Sm ceramics exhibit semiconductor like properties. Thermally stimulated depolarization currents (TSDC) testing verified that oxygen vacancies of A- x Sm ceramics mainly capture space charges, and a small part of oxygen vacancies form defective dipoles [ 2 Sm Ti ′ − V O.. ]. The complex impedance test shows that the change of resistivity of A- x Sm ceramics is mainly closed to the influence of Sm doping on the grain not grain boundary of BaTiO 3 ceramic. • Sm-doped BaTiO 3 ceramics were prepared by homogeneous precipitation method sintering in air and reducing atmosphere. • The oxygen vacancy defect in reducing atmosphere inhibits Sm ion substitution of B site. • Oxygen vacancy defects mainly capture the electrons produced by the donor doping in the air. • Sm ion mainly affects the electrical insulation performance of BaTiO 3 grain. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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171. Case report: Systemic sclerosis during neoadjuvant therapy for breast cancer in a 59-year-old woman.
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Liu S, Xiao X, Yue F, Su C, Tong Y, and Xu W
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- Humans, Female, Middle Aged, Antineoplastic Combined Chemotherapy Protocols therapeutic use, Antineoplastic Combined Chemotherapy Protocols adverse effects, Breast Neoplasms drug therapy, Breast Neoplasms therapy, Scleroderma, Systemic therapy, Neoadjuvant Therapy adverse effects
- Abstract
Systemic sclerosis (SSc) is an autoimmune connective tissue disease with skin fibrosis being the first and most common manifestation. Patients with SSc have a higher risk of developing malignant tumors than the general population. However, the sequence and underlying mechanisms linking SSc to malignancy remain controversial. This article presents the case of a 59-year-old woman who was diagnosed with SSc after developing skin fibrosis during neoadjuvant therapy for breast cancer. Despite aggressive antitumor treatments, including targeted therapy, SSc did not improve and progressed rapidly with increasing dermatofibrosis. Remarkably, the SSc entered remission following the cessation of antitumor therapy. Additionally, we reviewed the literature on SSc and malignant tumors, examined their relationship, and discussed key points regarding their identification and potential for adverse drug reactions., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2024 Liu, Xiao, Yue, Su, Tong and Xu.)
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- 2024
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172. DNA Nanolock-Based Logic Gate-Directed Reciprocal Feedback for Stepwise Cell Typing and Combination Treatment.
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Li K, Yang X, Ma J, Su C, Wang M, and Ye S
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- Humans, Metal Nanoparticles chemistry, MicroRNAs analysis, Computers, Molecular, Logic, G-Quadruplexes, Feedback, Doxorubicin pharmacology, Gold chemistry, DNA chemistry
- Abstract
To achieve accurate molecular diagnosis and early-stage intervention of disease on demand, there is an urgent need for the monitoring of multiple biomarkers and multipath information acquisition in living cells. The DNA combinatorial logic gate is an appropriate strategy for providing a systematic proof of concept with comprehensive information and function. Herein, a modular DNA logic gate nanomachine is designed for sufficient multistep reciprocal cell identification and therapy via the iteration of simple logic operations. In this logic gate system, this main module is constructed by G-quadruplex-locked gold nanocages (AuNCs), serving dual functions of drug encapsulation and cell recognition. The logic system is composed of OR, XNOR, AND, and NOR gates employing two intracellular disease biomarkers (microRNA 21 and microRNA 155) as inputs and the fluorescence signal of doxorubicin (Dox) as an output. The output signals of the four logic gates are iterated to process the imaging analysis data from the complex matrix in the living cell. Via positive and negative reciprocal feedback, the series circuit of different gates enables different functions, including the preliminary screening and the distinction of the cell type. Through the mutual preliminary screening and further proof, this logic system achieves accurate identification of cells, controlled drug release, and photothermal treatment using the AuNC as a photothermal transducer. This DNA logic system broadens the applications of the biocomputing system in disease screening and logic-controlled treatment fields.
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- 2024
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173. A cancer-targeted glutathione-gated probe for self-sufficient ST/CDT combination therapy and FRET-based miRNA imaging.
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Su C, Cheng S, Cheng R, Li K, and Li Y
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- Humans, Animals, Aptamers, Nucleotide chemistry, Mice, Mice, Nude, Theranostic Nanomedicine methods, Nucleolin, Neoplasms diagnostic imaging, Nanostructures chemistry, Oligodeoxyribonucleotides chemistry, Mice, Inbred BALB C, Fluorescent Dyes chemistry, MicroRNAs, Glutathione chemistry, Glutathione metabolism, Fluorescence Resonance Energy Transfer, Manganese Compounds chemistry, Oxides chemistry
- Abstract
A cancer-targeted glutathione (GSH)-gated theranostic probe (CGT probe) for intracellular miRNA imaging and combined treatment of self-sufficient starvation therapy (ST) and chemodynamic therapy (CDT) was developed. The CGT probe is constructed using MnO
2 nanosheet (MS) as carrier material to adsorb the elaborately designed functional DNAs. It can be internalized by cancer cells via specific recognition between the AS1411 aptamer and nucleolin. After CGT probe entering the cancer cells, the overexpressed GSH, as gate-control, can degrade MS to Mn2+ which can be used for CDT by Fenton-like reaction. Simultaneously, Mn2+ -mediated CDT can further cascade with the enzyme-like activities (catalase-like activity and glucose oxidase-like activity) of CGT probe, achieving self-sufficient ST/CDT synergistic therapy. Meanwhile, the anchored DNAs are released, achieving in situ signal amplification via disubstituted-catalytic hairpin assembly (DCHA) and FRET (fluorescence resonance energy transfer) imaging of miR-21. The in vitro and in vivo experiments demonstrated that accurate and sensitive miRNA detection can be achieved using the CGT probe. Overall, the ingenious CGT probe opens a new avenue for the development of early clinical diagnosis and cancer therapy., (© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Austria, part of Springer Nature.)- Published
- 2024
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174. Imaging the electron charge density in monolayer MoS 2 at the Ångstrom scale.
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Martis J, Susarla S, Rayabharam A, Su C, Paule T, Pelz P, Huff C, Xu X, Li HK, Jaikissoon M, Chen V, Pop E, Saraswat K, Zettl A, Aluru NR, Ramesh R, Ercius P, and Majumdar A
- Abstract
Four-dimensional scanning transmission electron microscopy (4D-STEM) has recently gained widespread attention for its ability to image atomic electric fields with sub-Ångstrom spatial resolution. These electric field maps represent the integrated effect of the nucleus, core electrons and valence electrons, and separating their contributions is non-trivial. In this paper, we utilized simultaneously acquired 4D-STEM center of mass (CoM) images and annular dark field (ADF) images to determine the projected electron charge density in monolayer MoS
2 . We evaluate the contributions of both the core electrons and the valence electrons to the derived electron charge density; however, due to blurring by the probe shape, the valence electron contribution forms a nearly featureless background while most of the spatial modulation comes from the core electrons. Our findings highlight the importance of probe shape in interpreting charge densities derived from 4D-STEM and the need for smaller electron probes., (© 2023. This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply.)- Published
- 2023
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175. [Composition Characteristics of Volatile Organic Compounds and Associated Contributions to Secondary Pollution in Shenyang Industrial Area in Summer].
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Guan L, Su CC, Ku YY, Hu JL, and Yu XN
- Abstract
Based on the observation data of volatile organic compounds (VOCs) in the industrial area of Shenyang during the summer of 2019 and 2020, the composition characteristics and sources of VOCs were preliminarily studied. The ozone formation potential (OFP) and aerosol formation potential (AFP) of VOCs were also estimated using the max incremental reactivity (MIR) and aerosol formation coefficient (FAC) methods, respectively. The results showed that the average concentration of VOCs was 41.66 μg·m
-3 , and the proportions of alkanes, olefins, aromatics, and acetylene were 48.50%, 14.08%, 15.37%, and 22.05%, respectively. The top ten species of VOCs were primarily C2-C5 alkanes, also including acetylene, ethylene, and some aromatics, accounting for 69.25% of the total VOCs. VOCs showed obvious diurnal variation characteristics with a high concentration in the morning and evening (at 06:00 and 22:00) and a low concentration in the afternoon (11:00-16:00). According to the value of toluene/benzene (T/B) and isopentane/n-pentane, the atmosphere of the industrial area was mainly affected by vehicle exhaust emissions, solvent use, combustion sources, and LPG/NG. The total AFP of VOCs was up to 41.43×10-2 μg·m-3 , and aromatics were the largest contributor. The total OFP of VOCs reached 117.59 μg·m-3 , in which the alkenes contributed the most.- Published
- 2023
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176. Deep-Learning Electron Diffractive Imaging.
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Chang DJ, O'Leary CM, Su C, Jacobs DA, Kahn S, Zettl A, Ciston J, Ercius P, and Miao J
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- Electrons, Gold, Neural Networks, Computer, Algorithms, Deep Learning, Metal Nanoparticles
- Abstract
We report the development of deep-learning coherent electron diffractive imaging at subangstrom resolution using convolutional neural networks (CNNs) trained with only simulated data. We experimentally demonstrate this method by applying the trained CNNs to recover the phase images from electron diffraction patterns of twisted hexagonal boron nitride, monolayer graphene, and a gold nanoparticle with comparable quality to those reconstructed by a conventional ptychographic algorithm. Fourier ring correlation between the CNN and ptychographic images indicates the achievement of a resolution in the range of 0.70 and 0.55 Å. We further develop CNNs to recover the probe function from the experimental data. The ability to replace iterative algorithms with CNNs and perform real-time atomic imaging from coherent diffraction patterns is expected to find applications in the physical and biological sciences.
- Published
- 2023
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177. Tuning colour centres at a twisted hexagonal boron nitride interface.
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Su C, Zhang F, Kahn S, Shevitski B, Jiang J, Dai C, Ungar A, Park JH, Watanabe K, Taniguchi T, Kong J, Tang Z, Zhang W, Wang F, Crommie M, Louie SG, Aloni S, and Zettl A
- Subjects
- Color, Boron Compounds
- Abstract
The colour centre platform holds promise for quantum technologies, and hexagonal boron nitride has attracted attention due to the high brightness and stability, optically addressable spin states and wide wavelength coverage discovered in its emitters. However, its application is hindered by the typically random defect distribution and complex mesoscopic environment. Here, employing cathodoluminescence, we demonstrate on-demand activation and control of colour centre emission at the twisted interface of two hexagonal boron nitride flakes. Further, we show that colour centre emission brightness can be enhanced by two orders of magnitude by tuning the twist angle. Additionally, by applying an external voltage, nearly 100% brightness modulation is achieved. Our ab initio GW and GW plus Bethe-Salpeter equation calculations suggest that the emission is correlated to nitrogen vacancies and that a twist-induced moiré potential facilitates electron-hole recombination. This mechanism is further exploited to draw nanoscale colour centre patterns using electron beams., (© 2022. The Author(s), under exclusive licence to Springer Nature Limited.)
- Published
- 2022
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178. Beam-driven Dynamics of Aluminium Dopants in Graphene.
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Zagler G, Stecher M, Trentino A, Kraft F, Su C, Postl A, Längle M, Pesenhofer C, Mangler C, Åhlgren EH, Markevich A, Zettl A, Kotakoski J, Susi T, and Mustonen K
- Abstract
Substituting heteroatoms into graphene can tune its properties for applications ranging from catalysis to spintronics. The further recent discovery that covalent impurities in graphene can be manipulated at atomic precision using a focused electron beam may open avenues towards sub-nanometer device architectures. However, the preparation of clean samples with a high density of dopants is still very challenging. Here, we report vacancy-mediated substitution of aluminium into laser-cleaned graphene, and without removal from our ultra-high vacuum apparatus, study their dynamics under 60 keV electron irradiation using aberration-corrected scanning transmission electron microscopy and spectroscopy. Three- and four-coordinated Al sites are identified, showing excellent agreement with ab initio predictions including binding energies and electron energy-loss spectrum simulations. We show that the direct exchange of carbon and aluminium atoms predicted earlier occurs under electron irradiation, although unexpectedly it is less probable than the same process for silicon. We also observe a previously unknown nitrogen-aluminium exchange that occurs at Al─N double-dopant sites at graphene divacancies created by our plasma treatment., Competing Interests: Conflict of interest The authors declare no conflicts of interest.
- Published
- 2022
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179. [Pollution Characteristics and Ozone Formation Potential of Ambient VOCs in Different Functional Zones of Shenyang, China].
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Ku YY, Ren WH, Su CC, and Yu XN
- Subjects
- China, Environmental Monitoring, Vehicle Emissions analysis, Air Pollutants analysis, Ozone analysis, Volatile Organic Compounds analysis
- Abstract
Ambient volatile organic compounds(VOCs) were determined by GC 5000 online gas chromatography in three functional areas of Shenyang, namely industrial, traffic, and mixed cultural and educational areas. The pollution characteristics of VOCs in these functional areas during the heating and non-heating periods were analyzed, and the ozone formation potential(OFP) was estimated by using maximum incremental reactivity(MIR). The results show that the average mass concentration of VOCs is(82.19±54.99) μg·m
-3 in Shenyang, of which the concentration in industrial areas is significantly higher than that in traffic and cultural and educational mixed areas, and the heating period is higher. The traffic and mixed cultural and educational areas have bi-modal characteristics due to the morning and evening traffic, and the industrial area has multiple peaks affected by the irregular operation hours. The proportion of VOCs in traffic and mixed cultural and educational areas shows the order of alkanes>aromatic hydrocarbons>alkenes>alkynes, but the proportion of alkynes in industrial areas is higher than that of alkenes. The benzene to toluene(B/T) and ethane to acetylene(E/A) ratios reflects that traffic and mixed cultural and educational areas were affected by both vehicle exhaust emissions and fuel combustion. The industrial zone is therefore affected by complex sources, and there are more aged air masses during the heating period than non-heating period. The average OFP contribution of atmospheric VOCs in Shenyang is 232.89 μg·m-3 . The contribution of alkenes is largest for all functional areas, and the aromatic component also contributes more due to the high concentration of industrial areas.- Published
- 2021
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180. Antioxidative and immunological effects of Cyclocarya paliurus polysaccharides on the spleen injury of diabetic rat.
- Author
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Zhang K, Qi JX, Li YY, Gao HS, Shao XY, Su CY, Wang MQ, and Ouyang J
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- Animals, Antioxidants pharmacology, Plant Leaves, Polysaccharides therapeutic use, Rats, Spleen, Diabetes Mellitus, Experimental drug therapy, Juglandaceae
- Abstract
Objevtive: To investigate the effects of Cyclocarya paliurus (C. paliurus) polysaccharides on the spleen injury of diabetic rats., Methods: Animals were divided into 6 groups, including normal group, model group, control group, low-dose group of C. paliurus polysaccharides treatment, middle-dose group of C. paliurus polysaccharides treatment and high-dose group of C. paliurus polysaccharides treatment. Histological analysis of spleen was analyzed using hematoxilin and eosin. Levels of biological parameters and anti-oxidative enzymes were determined by spectrophotometry. Interleukin-7 (IL-7) and IL-10 were measured by enzyme-linked immunosorbent assay., Results: Compared with that of model group, superoxide dismutase, catalase, glutathione peroxidase, glutathione reductase level increased 78.63% (P < 0.05), 51.76% (P < 0.05), 2.95 times (P < 0.01) and 41.11% (P < 0.05) in the high-dose group of C. paliurus polysaccharides treatment, respectively. IL-7 and IL-10 increase 1.66 (P < 0.01) and 1.21 times (P < 0.01) in the high-dose group of C. paliurus polysaccharides treatment, respectively., Conclusion: It is suggested that C. paliurus polysaccharides may play a protecting role for spleen injury of diabetic rats by enhancing the antioxidative ability and evaluating the immunity.
- Published
- 2021
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181. Designing artificial two-dimensional landscapes via atomic-layer substitution.
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Guo Y, Lin Y, Xie K, Yuan B, Zhu J, Shen PC, Lu AY, Su C, Shi E, Zhang K, HuangFu C, Xu H, Cai Z, Park JH, Ji Q, Wang J, Dai X, Tian X, Huang S, Dou L, Jiao L, Li J, Yu Y, Idrobo JC, Cao T, Palacios T, and Kong J
- Abstract
Technology advancements in history have often been propelled by material innovations. In recent years, two-dimensional (2D) materials have attracted substantial interest as an ideal platform to construct atomic-level material architectures. In this work, we design a reaction pathway steered in a very different energy landscape, in contrast to typical thermal chemical vapor deposition method in high temperature, to enable room-temperature atomic-layer substitution (RT-ALS). First-principle calculations elucidate how the RT-ALS process is overall exothermic in energy and only has a small reaction barrier, facilitating the reaction to occur at room temperature. As a result, a variety of Janus monolayer transition metal dichalcogenides with vertical dipole could be universally realized. In particular, the RT-ALS strategy can be combined with lithography and flip-transfer to enable programmable in-plane multiheterostructures with different out-of-plane crystal symmetry and electric polarization. Various characterizations have confirmed the fidelity of the precise single atomic layer conversion. Our approach for designing an artificial 2D landscape at selective locations of a single layer of atoms can lead to unique electronic, photonic, and mechanical properties previously not found in nature. This opens a new paradigm for future material design, enabling structures and properties for unexplored territories., Competing Interests: The authors declare no competing interest.
- Published
- 2021
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182. [Construction of "2R network pharmacology" research method for effective components of traditional Chinese medicine based on "prediction of dominant components-screening of potential targets"].
- Author
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Zhou MN, Chen XY, Chen XH, Su CP, Li L, Jiang YY, Zhang W, Guo SZ, and Liu B
- Subjects
- Databases, Factual, Molecular Docking Simulation, Research Design, Drugs, Chinese Herbal pharmacology, Medicine, Chinese Traditional
- Abstract
Chinese traditional medicine compound is the main form of Chinese medicine clinical application. The elucidation of the effective components of traditional Chinese medicine is one of the key scientific issues to promote the modernization of traditional Chinese medicine. At present, there are many research ideas on the effective components of traditional Chinese medicine compounds. By analyzing the current status and existing problems of existing research ideas, the author proposes a "double reduction network pharmacology"(2 R network pharmacology) research method based on "prediction of dominant components-potential target selection". Chemical components with good properties were selected by ADMET property prediction technology, and compared with the blood components and target organ components to determine the dominant components with potential therapeutic effect, that is "reducing constituents"; the potential core regulatory pathway of traditional Chinese medicine compound was enriched by RNA-Seq technology combined with network database, and then the target of traditional Chinese medicine compound was mined based on the signal pathway, that is "reducing targets". To improve the efficiency and accuracy of effective component screening, the network relationship of "component target" was established by the related technology of network pharmacology. The purpose of this study is to provide practical research ideas and methods for clarifying the effective components of traditional Chinese medicine, revealing the law of compatibility of traditional Chinese medicine and clarifying the target of drug action.
- Published
- 2021
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183. [CRISPR/Cas9-based knockout of GPR43 gene in RAW264.7 cells inhibits their phagocytosis to Klebsiella pneumoniae].
- Author
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Xu F, Su C, Wu T, Chen H, Zhang P, Liu Y, Lan Y, and Li J
- Subjects
- Animals, Mice, Phagocytosis, RAW 264.7 Cells, RNA, Guide, CRISPR-Cas Systems, Receptors, G-Protein-Coupled, CRISPR-Cas Systems, Klebsiella pneumoniae genetics
- Abstract
Objective To construct cell line RAW264.7 with stable knockout of GPR43 gene using CRISPR/Cas9 system, and explore the role and mechanism of GPR43 gene in Klebsiella pneumoniae infection. Methods Three pairs of small-guide RNA (sgRNA) targeting the GPR43 gene were designed and inserted into plasmid pLenticrisprV2. The recombinant plasmid pLenticrisprV2 containing sgRNA was packaged using a lentivirus packaging system. RAW264.7 cells were transfected with viruses, and monoclonal cells were screened using puromycin. The genomic DNA was extracted from the amplified monoclonal cells. The GPR43 gene-related sequences were sequenced and compared with the wild-type GPR43 gene to confirm the cell line with successful knockout (GPR43
-/- RAW264.7 cells). The expression of GPR43 protein was detected by Western blotting. After GPR43-/- RAW264.7 cells were transfected with Klebsiella pneumoniae, the changes in the expression of interleukin-1β (IL-1β), IL-6 and tumor necrosis factor-α (TNF-α) in the cells were detected using real-time quantitative PCR. Additionally, the phagocytic capacity of RAW264.7 cells after GPR43 knockout was observed. Results Western blotting confirmed that GPR43 protein was not expressed in the selected monoclonal cells, and DNA sequencing showed that 34 bases were missing at the insertion site of sgRNA, which proved that GPR43 gene was successfully knocked out. After GPR43-/- RAW264.7 cells were transfected with Klebsiella pneumoniae, the levels of IL-1β, IL-6 and TNF-α expression in the cells were all lower than those in the control group, and the phagocytic capacity of GPR43-/- RAW264.7 cells to Klebsiella pneumoniae decreased. Conclusion CRISPR/Cas9-based knockout of GPR43 gene in RAW264.7 cells can inhibit their phagocytosis for Klebsiella pneumoniae and production of inflammatory cytokines.- Published
- 2020
184. Two-dimensional halide perovskite lateral epitaxial heterostructures.
- Author
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Shi E, Yuan B, Shiring SB, Gao Y, Akriti, Guo Y, Su C, Lai M, Yang P, Kong J, Savoie BM, Yu Y, and Dou L
- Abstract
Epitaxial heterostructures based on oxide perovskites and III-V, II-VI and transition metal dichalcogenide semiconductors form the foundation of modern electronics and optoelectronics
1-7 . Halide perovskites-an emerging family of tunable semiconductors with desirable properties-are attractive for applications such as solution-processed solar cells, light-emitting diodes, detectors and lasers8-15 . Their inherently soft crystal lattice allows greater tolerance to lattice mismatch, making them promising for heterostructure formation and semiconductor integration16,17 . Atomically sharp epitaxial interfaces are necessary to improve performance and for device miniaturization. However, epitaxial growth of atomically sharp heterostructures of halide perovskites has not yet been achieved, owing to their high intrinsic ion mobility, which leads to interdiffusion and large junction widths18-21 , and owing to their poor chemical stability, which leads to decomposition of prior layers during the fabrication of subsequent layers. Therefore, understanding the origins of this instability and identifying effective approaches to suppress ion diffusion are of great importance22-26 . Here we report an effective strategy to substantially inhibit in-plane ion diffusion in two-dimensional halide perovskites by incorporating rigid π-conjugated organic ligands. We demonstrate highly stable and tunable lateral epitaxial heterostructures, multiheterostructures and superlattices. Near-atomically sharp interfaces and epitaxial growth are revealed by low-dose aberration-corrected high-resolution transmission electron microscopy. Molecular dynamics simulations confirm the reduced heterostructure disorder and larger vacancy formation energies of the two-dimensional perovskites in the presence of conjugated ligands. These findings provide insights into the immobilization and stabilization of halide perovskite semiconductors and demonstrate a materials platform for complex and molecularly thin superlattices, devices and integrated circuits.- Published
- 2020
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185. [Anti-inflammatory mechanism of heat-clearing and detoxifying Chinese herbs].
- Author
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Wang Q, Su CP, Zhang HM, Ren YL, Wang W, and Guo SZ
- Subjects
- Hot Temperature, Humans, Medicine, Chinese Traditional, Signal Transduction drug effects, Anti-Inflammatory Agents pharmacology, Drugs, Chinese Herbal pharmacology
- Abstract
Heat-clearing and detoxifying Chinese herbs (HDCHs) are mainly used to treat carbuncle, sore throat, erysipelas, gills, dysentery and other diseases induced by heat-toxicity. Inflammation is a defensive response to damaging factors in living organism with vascular system. In recent years, a large amount of experimental and clinical studies showed that HDCHs had good therapeutic effect on inflammation. This review analyzed the anti-inflammatory mechanism of 11 HDCHs by retrieving literature in past 5 years, including Lonicerae Japonicae Flos (Jinyinhua), Lonicerae Flos (Jinyinhua), Lonicerae Japonicae Caulis (Rendongteng), Forsythiae Fructus (Lianqiao), Rhizoma Coptidis(Huanglian), Gardeniae Fructus (Zhizi), Andrographis Herba (Chuanxinlian), Taraxaci Herba (Pugongying), Scrophulariae Radix (Xuanshen), Pulsatillae Radix (Baitouweng), and Agrimoniae Herba (Xianhecao). The data showed that the regulatory effect of HDCHs on inflammation may be involved mainly in the nuclear factor-κB (NF-κB), mitogen-activated protein kinase (MAPK) or janus kinase-signal transducers and activators of transcription (JAK-STAT) pathway, with similarity of action links among these three. Based upon the analysis of literature, we proposed some promising directions in this research field, providing a reliable theoretical basis for both experimental researches and clinical practices of HDCHs., Competing Interests: The authors of this article and the planning committee members and staff have no relevant financial relationships with commercial interests to disclose., (Copyright© by the Chinese Pharmaceutical Association.)
- Published
- 2018
- Full Text
- View/download PDF
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