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( Wang Hangyu ),( Li Panpan ),( Shen Jie ),( Wang Hongyan ),( Wei Linmiao ),( Han Kangning ),( Shi Yichen ),( Wang Shuai ),( Wang Cheng ) 한국미생물생명공학회 2024 Journal of microbiology and biotechnology Vol.34 No.7
Viral infectious diseases have always been a threat to human survival and quality of life, impeding the stability and progress of human society. As such, researchers have persistently focused on developing highly efficient, low-toxicity antiviral drugs, whether for acute or chronic infectious diseases. This article presents a comprehensive review of the design concepts behind virus-targeted drugs, examined through the lens of antiviral drug mechanisms. The intention is to provide a reference for the development of new, virus-targeted antiviral drugs and guide their clinical usage.
Yu-Shuai Wang,Yin-Ping Jin,Wei Gao,Sheng-Yuan Xiao,Yu-Wei Zhang,Pei-He Zheng,Jia Wang,Jun-Xia Liu,Cheng-He Sun,Ying-Ping Wang 고려인삼학회 2016 Journal of Ginseng Research Vol.40 No.3
Background: Ginsenosides are the major effective ingredients responsible for the pharmacological effects of ginseng. Malonyl ginsenosides are natural ginsenosides that contain a malonyl group attached to a glucose unit of the corresponding neutral ginsenosides. Methods: Medium-pressure liquid chromatography and semipreparative high-performance liquid chromatography were used to isolate purified compounds and their structures determined by extensive one-dimensional- and two-dimensional nuclear magnetic resonance (NMR) experiments. Results: A new saponin, namely malonyl-ginsenoside Re, was isolated from the fresh flower buds of Panax ginseng, along with malonyl-ginsenosides Rb1, Rb2, Rc, Rd. Some assignments for previously published ¹H- and <SUP>13</SUP>C-NMR spectra were found to be inaccurate. Conclusion: This study reports the complete NMR assignment of malonyl-ginsenoside Re, Rb₁, Rb₂, Rc, and Rd for the first time.
Chemical Vapor Deposition Growth of Graphene Domains Across the Cu Grain Boundaries
Yang Wang,Yu Cheng,Yunlu Wang,Shuai Zhang,Chen Xu,Xuewei Zhang,Miao Wang,Yang Xia,Qunyang Li,Pei Zhao,Hongtao Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.08
Many aspects in the chemical vapor deposition (CVD) growth of graphene remain unclear such as its behavior near the catalyst grain boundaries. Here we investigate the CVD growth mechanism of graphene across the Cu grain boundaries using unidirectional aligned graphene domains, which simplifies the analysis of both graphene and Cu to a large extent. We found that for a graphene domain grown across the Cu grain boundary, the domain orientation is determined by the Cu grain where the domain nucleation center is located, and the Cu grain boundary will not change the growth behavior for this graphene domain. This growth mechanism is consistent with the Custep-attached nucleation and edge-attachment-limited growth mechanism for H-terminated graphene domains and will provide more guidance for the synthesis of high-quality graphene with less domain boundaries.
Remote Sensing Image Fusion Based On IHS and Dual Tree Compactly Supported Shearlet Transform
Chang Duan,Qihong Huang,Xuegang Wang,Shuai Wang,Hong Wang 보안공학연구지원센터 2014 International Journal of Signal Processing, Image Vol.7 No.5
This paper presents a novel remote sensing image fusion algorithm, which implements the intensity-hue-saturation (IHS) transform on panchromatic sharpening of multispectral data and the dual-tree compactly supported shearlet transform (DT CSST) during fusion. Shearlet transforms can provide almost optimal representation of the anisotropic features of an image. The spatial domain discrete implementation, the compactly supported shearlet transform (CSST), which represents the directions by dilation operations, are selected in the proposed fusion method. Since most of the prominent features of images, such as edges and regions, have limited sizes in the spatial domain, CSST is very suitable for image fusion. However, the conventional CSST is shift-variant, which causes distortions in fused images. With the embedded dual-tree (DT) sturcture in the CSST, the shift-variant properties can be effectively reduced. Combining the IHS transform and the DT CSST, an effective panchromatic and multispectral image fusion method is proposed in this paper. The experiments’ results suggest that the proposed method extract more spatial information from panchromatic images with less lost in spectral consistency compared to other fusion methods which are based on discrete wavelet transform (DWT), à trous wavelet transform, à trous shearlet transform, the dual-tree complex wave transform ( DT CWT), or the Curvelet transform.
Preparation and antimicrobial assay of ceramic brackets coated with TiO₂ thin films
Shuai Cao,Ye Wang,Lin Cao,Yu Wang,Bingpeng Lin,Wei Lan,Baocheng Cao 대한치과교정학회 2016 대한치과교정학회지 Vol.46 No.3
Objective: Different methods have been utilized to prevent enamel demineralization and other complications during orthodontic treatment. However, none of these methods can offer long-lasting and effective prevention of orthodontic complications or interventions after complications occur. Considering the photocatalytic effect of TiO₂ on organic compounds, we hoped to synthesize a novel bracket with a TiO₂ thin film to develop a photocatalytic antimicrobial effect. Methods: The sol-gel dip coating method was used to prepare TiO₂ thin films on ceramic bracket surfaces. Twenty groups of samples were composed according to the experimental parameters. Crystalline structure and surface morphology were characterized by X-ray diffraction and scanning electron microscopy, respectively; film thickness was examined with a surface ellipsometer. The photocatalytic properties under ultraviolet (UV) light irradiation were analyzed by evaluating the degradation ratio of methylene blue (MB) at a certain time. Antibacterial activities of selected thin films were also tested against Lactobacillus acidophilus and Candida albicans . Results: Films with 5 coating layers annealed at 700°C showed the greatest photocatalytic activity in terms of MB decomposition under UV light irradiation. TiO₂ thin films with 5 coating layers annealed at 700°C exhibited the greatest antimicrobial activity under UV-A light irradiation. Conclusions: These results provide promising guidance in prevention of demineralization by increasing antimicrobial activities of film coated brackets.
Wang, Li-Ying,Wang, Xiu-Hua,Tan, Jia-Lian,Xia, Shuai,Sun, Heng-Zhi,Shi, Jin-Wen,Jiang, Ming-Dong,Fang, Liang,Zuo, Hua,Dupati, Gautam,Jang, Kiwan,Shin, Dong-Soo Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
A number of novel small molecules, safrole oxide derivatives 4a-c, 6a-c, 9a-h, were synthesized by the reaction of safrole oxide with anilines 3 and 5, or its alkyl allyl ether derivative 7 with alkyl bromide 8 in moderate yields. The antiproliferative effects of all the target molecules on A549 cell growth were investigated and it was found that the 14 novel compounds could suppress A549 lung cancer cell growth. Among them, compound 6b was the most effective compound in inhibiting the proliferation of A549 cells.
Study on the pore/scratch-strength response of ZrB2–SiC ceramic via laser processing
Wang Anzhe,Wang Shuai,Yin Huimin,Zhou Peng,Liu Dazhao 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.6
Defects, such as pores and scratches, are inevitably introduced during preparation and processing of ceramics. How they aff ect the mechanical properties of materials is worthy of attention. Here, artifi cial surface pores and notches introduced by femtosecond/nanosecond lasers are regarded as inherent pore- and scratch-like defects. Bending test results indicated that a small-sized fl aw with the length and depth of ~ 10 μm could lead to a strength reduction up to ~ 40% in sharp fl aw case, while only slight attenuation (< 10%) occurs in blunt fl aw case. Linear extrapolation result reveals that the maximum strength in notch cases, when the depth reaches the atomic scale, is ~ 34 GPa, which is in the range of the theoretical value of 24–48 GPa. Furthermore, the calculated critical fl aw size ( ac) may tend to be overestimated, given that the artifi cial defect, which is smaller than the ac value, also results in signifi cant strength decay. This study could provide guidance for strength evalu- ation and high-strength design of ceramics.
Wang Shuai,Zheng Xiaolei,Wang Jin,Yang Jianzhi 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.6
The radioactive pollutant could migrate to the downstream urban area under the action of atmospheric dispersion due to the turbulent mixing under actual pollution accidents. A scenario in which radioactive contaminants from the upstream (for example, a nearshore nuclear power plant accident) migrates to the downstream urban blocks have been considered in this study. Numerical simulations using computational fluid dynamics (CFD) are then conducted to investigate the effects of the urban morphology (building packing density and layout) on the atmospheric dispersion of radioactive pollutants in this scenario. The building packing density and structure can significantly affect urban areas’ mean flow pattern and the turbulent kinetic energy (TKE). The flow pattern and the TKE distribution influence the radioactive pollution dispersion. It is found that the radioactive pollution at the urban canyons is significantly affected by the vertical transport at the canyon. A comparison of the distributions of radioactive and traditional non-radioactive pollutants is also provided
Shuai Wang,Aixun Wang,Xudong Fu,Keyang Wu,Xianwei Zhang,Yongpeng Tang 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.3
Reinforcement of recycled aggregates stands as a pivotal strategy to stimulate their resource utilization. This study proposesa strengthening method of recycled aggregate combined with particle molding and vacuum cement coating, and the keycontrol parameters in the reinforcement process, resultant reinforcement outcomes, failure modes, and water absorptionkinetics were discussed. Experimental findings suggest that diminutive surface particle sizes present amplified challenges forshaping. The particle strength within each size categories demonstrates an initial ascent followed by descent with prolongedshaping, underscoring an optimal reinforcement duration. Excessive shaping precipitates a decline in the property of recycledaggregates, manifested through fracture, crush, and local damage. The moisture content of recycled aggregates undergoesfluctuations throughout the shaping process. Notably, the application of vacuum cement coating markedly ameliorateswater absorption post-particle shaping, thereby augmenting failure mode resilience. Building upon these observations, theframework of “moderate shaping,” “moderate damage,” and “damage-repair integration” is introduced for both internaland external reinforcement. This paradigm aims to bolster the particle strength of recycled aggregates, thus facilitating waterconservation during the scale-up preparation phase. This study can guide the establishment of production facilities tailoredfor recycled concrete and furnish insights for the scaled-up preparation of recycled concrete materials.