299 results on '"Xiang-Yu Li"'
Search Results
102. An ultra-performance liquid chromatography-tandem mass spectrometry method for the determination of obeticholic acid in rat plasma and its application in preclinical pharmacokinetic studies
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Ling-jing Yuan, Sheng-hong Zhu, Fang Yang, Xiang-yu Li, and Guo-Xin Hu
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Male ,Electrospray ionization ,Clinical Biochemistry ,Chenodeoxycholic Acid ,Tandem mass spectrometry ,030226 pharmacology & pharmacy ,01 natural sciences ,Biochemistry ,Analytical Chemistry ,Rats, Sprague-Dawley ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Drug Stability ,Pharmacokinetics ,Limit of Detection ,Tandem Mass Spectrometry ,Liquid chromatography–mass spectrometry ,medicine ,Animals ,Chromatography, High Pressure Liquid ,Chromatography ,010401 analytical chemistry ,Selected reaction monitoring ,Reproducibility of Results ,Obeticholic acid ,Cell Biology ,General Medicine ,Ursodeoxycholic acid ,Rats ,0104 chemical sciences ,chemistry ,Linear Models ,Quantitative analysis (chemistry) ,medicine.drug - Abstract
Currently, ursodeoxycholic acid (UDCA) is the only clear medical treatment for primary biliary cholangitis (PBC). However, approximately 40% of patients are not sensitive to UDCA. In recent years, obeticholic acid (OCA) combined with UDCA has been used in the PBC patients who were not sensitive to UDCA, or as monotherapy for PBC adult patients who are intolerant to UDCA. Objective To develop and validate a specific, sensitive and reliable tandem mass spectrometry (UPLC-MS/MS) method for the determination of obeticholic acid (OCA) in rat plasma. Methods Plasma samples were treated with liquid–liquid extraction. Diazepam was selected as the internal standard (IS). Chromatographic separation was achieved by an Acquity BEH C18 column (2.1 mm × 50 mm, 1.7 μm) and a mobile phase consisting of acetonitrile and ultrapure water (containing 0.1% formic acid). The analyte was detected in positive ion mode by electrospray ionization mass spectrometry (ESI-MS). Multiple reaction monitoring (MRM) methods were used to detect specific precursor and product ions. The target ion pair of OCA was 419.38 → 401.22, and the IS was 285.05 → 193.02. Results The linear range of OCA in rat plasma was 0.05–50 μg/mL (R2 = 0.992); the recovery rate was 91.34%–97.37%. This assay showed good intra- and inter-day precision and accuracy. No significant matrix effects in this study. Conclusion A specific, sensitive and reliable quantitative analysis method was established to detect OCA after oral/intravenous administration in rat plasma via UPLC-MS/MS. It was appropriate for preclinical pharmacokinetic studies of OCA.
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- 2019
103. Host protein CD63 promotes viral RNA replication by interacting with human astrovirus non-structural protein nsP1a/4
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Yong gang Li, Heng Zhang Lu, Chun hong Zheng, wei zhao, Xiang yu Li, Man Yu, Xiao Li Tao, and Nian liu
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0301 basic medicine ,030106 microbiology ,Viral Nonstructural Proteins ,Biology ,Virus Replication ,Virus ,Cell Line ,law.invention ,Pathogenesis ,03 medical and health sciences ,Confocal microscopy ,law ,Cell Line, Tumor ,Virology ,Humans ,Gene knockdown ,CD63 ,Tetraspanin 30 ,Host (biology) ,Retraction ,Cell biology ,HEK293 Cells ,030104 developmental biology ,Viral replication ,Cytoplasm ,Astroviridae ,RNA, Viral ,Caco-2 Cells - Abstract
Human astrovirus non-structural protein nsP1a/4, located at the C-terminal end of nsP1a, is thought to be involved in regulating RNA replication. Here, we show that host protein CD63 interacts with the nsP1a protein. Further research showed that the large loop (LEL) domain of CD63 also interacts with nsP1a/4. Confocal microscopy showed that nsP1a/4 protein and CD63 co-localized in the cytoplasm of co-transfected cells. Co-localization of nsP1a/4 and CD63 was also observed in HAstV-1-infected cells. Overexpression of CD63 promoted replication of HAstV-1, whereas knockdown of CD63 reduced production of HAstV-1 viral progeny. These results suggest that CD63 plays a critical role in HAstV-1 replication, and provide an avenue to further understanding the interactions between host and virus proteins during replication and pathogenesis of HAstV.
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- 2019
104. Three-dimensional coupling field for an electromagnetically semi-permeable elliptical crack in multiferroic composite media
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Xiang-Yu Li, Rui-Feng Zheng, and T.-H. Wu
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Surface (mathematics) ,Physics ,Coupling ,Field (physics) ,Mechanical Engineering ,Mathematical analysis ,0211 other engineering and technologies ,Elliptic function ,02 engineering and technology ,Potential theory ,Finite element method ,Condensed Matter::Materials Science ,Nonlinear system ,020303 mechanical engineering & transports ,0203 mechanical engineering ,Mechanics of Materials ,General Materials Science ,Stress intensity factor ,021101 geological & geomatics engineering - Abstract
This article is concerned with an electromagnetically semi-permeable elliptical crack embedded in a multiferroic composite medium. The multiferroic composite medium is infinite and subjected to combined magneto-electro-elastic loads applied symmetrically at infinity. The boundary integro-differential equations associated with this nonlinear problem are solved analytically, with the aid of the generalized method of potential theory. The complete and closed-form coupling field is obtained and expressed with two elliptic functions. In addition, the crucial quantities on the crack plane, including the generalized crack surface displacements, the behavior of normal stresses in the crack-tip field and the generalized stress intensity factors, are derived explicitly. Numerical calculation and the finite element analyses for a BaTiO3-CoFe2O4 composite medium are performed to verify the present analytical results and to illustrate the important parameters on the crack plane graphically.
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- 2019
105. Reliability assessment of non-repairable multi-state phased mission systems with backup missions
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Xiang-Yu Li, Xiaoyan Xiong, Junyu Guo, Hong-Zhong Huang, and Xiaopeng Li
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Safety, Risk, Reliability and Quality ,Industrial and Manufacturing Engineering - Published
- 2022
106. Metalloporphyrin functionalized multivariate IRMOF-74-IV analogs for photocatalytic CO2 reduction
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Tong-Chuan Li, Xiang-Jing Kong, Yabo Xie, Tao He, Guang-Rui Si, Xiang-Yu Li, Wei Wu, Minjian Zhao, and Jian-Rong Li
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Filtration and Separation ,Analytical Chemistry - Published
- 2022
107. The pedagogical content knowledge of two novice Chinese early childhood EFL teachers
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Xiao-bo Shi, Xiang-Yu Li, and Susanna S. Yeung
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Linguistics and Language ,Language and Linguistics ,Education - Abstract
Researchers in the field of teacher knowledge have been attempting to delineate pedagogical content knowledge (PCK) in different subjects and different levels of education. To date, there is a need to develop a nuanced understanding on the PCK of Early Childhood Education (ECE) teachers who teach English as a foreign language (EFL). This study used a qualitative method, stimulated recall classroom observation, to investigate the categories and subcategories of PCK of Chinese EFL teachers from Chinese/English bilingual kindergartens in China. Two novice EFL teachers with less than 2 years of post-qualification teaching experience participated in this study. The data revealed three categories of PCK of ECE EFL teachers in the Chinese context: knowledge of curriculum, knowledge of learners, and knowledge of teaching strategies and multiple representations. Influenced by knowledge of curriculum, and knowledge of teaching strategies and multiple representations, the teachers had commonalities in classroom practice which were the product-oriented pedagogy and the textbook-led syllabus in the Chinese context. The study has several implications for research and practice for ECE EFL teacher education, especially for those practicing in the Chinese context.
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- 2022
108. Reliability assessment of phased-mission systems under random shocks
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Yan-Feng Li, Hong-Zhong Huang, Enrico Zio, Xiang-Yu Li, University of Electronic Science and Technology of China (UESTC), Chaire Sciences des Systèmes et Défis Energétiques EDF/ECP/Supélec (SSEC), Ecole Centrale Paris-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-CentraleSupélec-EDF R&D (EDF R&D), EDF (EDF)-EDF (EDF), Laboratoire Génie Industriel - EA 2606 (LGI), and CentraleSupélec
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Risk ,0209 industrial biotechnology ,Markov regenerative process ,Computer science ,Astrophysics::High Energy Astrophysical Phenomena ,Monte Carlo method ,0211 other engineering and technologies ,02 engineering and technology ,Industrial and Manufacturing Engineering ,020901 industrial engineering & automation ,Control theory ,Altitude and orbit control system ,Monte Carlo simulation ,Phased-mission system ,Random shocks ,Safety, Risk, Reliability and Quality ,Electronics ,Sensitivity (control systems) ,Aerospace ,Reliability (statistics) ,[STAT.AP]Statistics [stat]/Applications [stat.AP] ,021103 operations research ,State-space representation ,business.industry ,[STAT]Statistics [stat] ,Reliability and Quality ,Control system ,Orbit (dynamics) ,Safety ,business - Abstract
International audience; A B S T R A C T Phased-mission systems (PMSs) are widely used, especially in the aerospace industry. As in the outer space there are many kinds of cosmic rays, such as the Galactic Cosmic Rays (GCR), randomly hitting on these systems and causing significant impact on the electronics inside or outside the equipment, a reliability model for PMSs considering both finite and infinite random shocks is proposed in this paper. The modularization method is used to simplify the state space model for each phase and reduce the amount of system states, and the Markov regenerative process (MRGP) is used to describe the hybrid components' lifetime distributions and the dynamic behaviors within the modules. Then, two kinds of scenarios, finite and infinite random shocks effect, are both integrated into the dynamic modules. For demonstration, a phased altitude and orbit control system (AOCS) subjected to infinite random shocks is illustrated to demonstrate the procedure of the proposed Monte Carlo simulation. Thirdly, the evaluated system reliability under infinite random shocks is compared with the same system without considering random shocks. At last, a sensitivity analysis is also provided for completion.
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- 2018
109. Enantioselective synthesis of indolo[2,3-b]-dihydrothiopyranones via [3+3] cycloaddition of chiral α,β-unsaturated acylammonium salts
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Wei-Ping Deng, Jing-Hai Jin, Xiaoyan Luo, and Xiang Yu Li
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Proton ,010405 organic chemistry ,Chemistry ,Organic Chemistry ,Drug Discovery ,Michael reaction ,Enantioselective synthesis ,010402 general chemistry ,01 natural sciences ,Biochemistry ,Medicinal chemistry ,Cycloaddition ,0104 chemical sciences - Abstract
A nucleophile-catalyzed Michael addition/proton transfer/lactonization (NCMPL) organocascade process of chiral α,β-unsaturated acylammonium salts and indoline-2-thiones is described, which delivers the indolo[2,3-b]dihydrothiopyranone motifs in high yields (up to 97%) with good to excellent enantioselectivities (up to 98% ee).
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- 2018
110. First Experience in the Treatment of Acute Severe Open Cranio-Cerebral Injury with Infection by Unconventional Means
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Tong Ren, Xun Wang, Xiang-Yu Li, Hong-Jun Zhao, and Wen-Xiao Wu
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Microbiology (medical) ,Cerebral injury ,Infectious Diseases ,business.industry ,Anesthesia ,Brain Injuries ,MEDLINE ,Medicine ,Craniocerebral Trauma ,Humans ,Surgery ,business - Published
- 2021
111. Survey of microphysical properties of marine boundary-layer clouds in the Western North Atlantic
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Ewan Crosbie, K. Lee Thornhill, Andrea F. Corral, Richard Ferrare, Hossein Dadashazar, Michael Shook, Dominik Schollmayer, Luke D. Ziemba, Halong Wang, Gao Chen, Ann M. Fridlind, Christiane Voigt, Richard H. Moore, Simon Kirschler, Andrew S. Ackerman, Johnathan W. Hair, Bruce E. Anderson, Florian Tornow, Xiang-Yu Li, and Armin Sorooshian
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Marine boundary layer ,Oceanography ,Geology - Abstract
Oceanic low level clouds strongly affect the atmospheric radiation budget. Uncertainties in their microphysical properties and cover currently limit the accuracy of climate predictions. Further, studies quantifying the relative importance of aerosol and dynamics on cloud properties in specific meteorological regimes are poorly constrained by observations in the Western North Atlantic boundary layer.Low level clouds were measured during the Aerosol Cloud meTereology Interactions oVer the western ATlantic Experiment (ACTIVATE) campaign in winter and summer 2020. The two NASA LaRC research aircraft HU-25 Falcon and UC-12 B-200 King Air conducted 35 simultaneous flights to investigate aerosol-cloud interactions of maritime clouds and their impact on radiation. Number concentration, liquid water content, ice water content, and particle size distribution in the size range of 3 µm to 1460 µm in diameter were measured with the fast forward scattering cloud probe (FCDP) and 2-dimensional optical array imaging probe (2D-S) onboard the Falcon. Here, we present an overview of late winter (February-March) and late summer (August-September) oceanic cloud properties in the region 65°W to 80°W and 30°N to 40°N. We compare cloud properties in these two seasons and investigate their dependence on meteorological parameters and aerosol abundance. In a case study, we present cloud observations in a cold air outbreak event on 1 March 2020 with a specific focus on mixed-phase clouds.
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- 2021
112. Alantolactone suppresses the metastatic phenotype and induces the apoptosis of glioblastoma cells by targeting LIMK kinase activity and activating the cofilin/G-actin signaling cascade
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Shuang Zou, Li-Jun Zhao, Xun Wang, Xiang-Yu Li, Li-Fei Yu, Lijun Zhang, Xin Yan, and Tong Ren
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0301 basic medicine ,Cell ,cofilin ,03 medical and health sciences ,LIMK ,Lactones ,0302 clinical medicine ,Western blot ,Cell Line, Tumor ,Genetics ,medicine ,Humans ,Sesquiterpenes, Eudesmane ,Kinase activity ,Neoplasm Metastasis ,Actin ,medicine.diagnostic_test ,Chemistry ,alantolactone ,glioblastoma ,apoptosis ,Lim Kinases ,Cell migration ,General Medicine ,Articles ,Cofilin ,Cell cycle ,migration and invasion ,Actins ,Neoplasm Proteins ,030104 developmental biology ,medicine.anatomical_structure ,Actin Depolymerizing Factors ,Apoptosis ,030220 oncology & carcinogenesis ,Cancer research - Abstract
Glioblastoma (GBM) is the most common aggressive brain tumor and is associated with an extremely poor prognosis, as the current standard of care treatments have limited efficacy. Natural compounds have attracted increasing attention as potential anticancer drugs. Alantolactone (ATL) is a natural small molecule inhibitor, that has antitumor properties. In the present study, U87MG and U251 cells were treated ATL and changes in actin/G‑actin/F‑actin/cofilin pathway were detected in whole cells, in the cytoplasm and mitochondria by western blot analysis. Immunofluorescence and immunoprecipitation analysis identified changes in the expression levels of target proteins and interactions, respectively. A LIMK enzyme inhibitor was also applied to assess the effects of ATL on the migration and invasion of GBM cells. Flow cytometry was used to detect the levels of apoptosis of GBM cells. The expression of matrix metalloproteinase (MMP)‑2/MMP‑9, caspase‑3/caspase‑9/poly(ADP‑ribose) polymerase (PARP)/cytochrome c, were determined by western blot analysis to assess the effects of targeting LIMK. The in vitro findings were verified in vivo by characterizing changes in the expression of cofilin/LIMK in xenograft tumors in immunodeficient mice. It was found that ATL activated cofilin through the targeted inhibition of LIMK enzyme activity and it thus upregulated the ratio of G/F actin, and inhibited GBM cell migration and invasion. Conversely, the activation of cofilin and G‑actin could be co‑transferred to the mitochondria to initiate the mitochondrial‑cytochrome c pathway to induce apoptosis. On the whole, the findings of the present study further illustrate the molecular mechanisms through which ATL inhibits the metastatic phenotype of GBM cells and induces apoptosis. Given previous findings, it can be deduced that ATL can function through multiple pathways and has multiple targets in GBM models, highlighting its potential for use in clinical applications.
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- 2021
113. Gastric adenocarcinoma combined with mucosa-associated lymphoma
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Mei-Lin Zhu, Xue-Qin Bai, and Xiang-Yu Liu
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Gastric cancer ,Gastric mucosa-associated lymphoma ,Surgery ,RD1-811 - Published
- 2024
- Full Text
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114. Insights on anaerobic digestion foaming via association between bacterial metabolism and variations in microbiota
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Xiang-Yu Li, Peng-Cheng Xu, Jian-Lu Duan, Jing-Ya Ma, Xiao-Dong Sun, Yue Feng, Xian-Zheng Yuan, Fu Xiao, Li-Juan Feng, Qian Wang, Ru-Kang Tian, and Wen-Lin Sun
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Anaerobic digestion ,Chemistry ,Correlation analysis ,Loading rate ,Process efficiency ,Microbial metabolism ,lipids (amino acids, peptides, and proteins) ,Food science ,Operational costs ,Anaerobic exercise - Abstract
Background: Foaming in anaerobic digesters is considered a global concern due to significant impacts on process efficiency and operational costs. Although the importance of the organic loading rate on anaerobic foaming is now widely recognized, little is known about the key bacteria among the hundreds of species inducing foaming, especially the metabolite-microbiota correlation that influences foaming in anaerobic digesters.Results: Here, we show that the organic loading rate promotes foaming and decreases the performances of bench-scale batch digesters. Metabolomics analysis revealed distinct changes in the metabolic phenotype, including mainly short-chain fatty acids and amino acids, decreasing the surface tension and inducing foaming. Furthermore, the correlation analysis revealed that Clostridium clusters were the main microbes contributing to these metabolite foaming incidents.Conclusions: We provide the foaming microbes and metabolites in anaerobic digestion. Our findings elucidate the complex formation of foaming in anaerobic digestion and provide an effective early-warning for the control of foaming in full-scale digesters.
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- 2020
115. Enzymatic activity on valsartan of 38 CYP2C9 variants from the Chinese population
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Ling-Jing, Yuan, Jian-Chang, Qian, Xiang-Yu, Li, Ju, Cui, Jian-Ping, Cai, and Guo-Xin, Hu
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China ,Kinetics ,Asian People ,Tandem Mass Spectrometry ,Humans ,Valsartan ,General Medicine ,Toxicology ,Chromatography, High Pressure Liquid ,Cytochrome P-450 CYP2C9 ,Protein Structure, Tertiary - Abstract
Valsartan is widely used for the treatment of moderate hypertension. However, previous studies have found that efficacy of the valsartan depends on the dose and intake. Cytochrome P450 (CYP) 2C9 metabolizes ∼15% of the clinical drugs. Genetic polymorphisms of CYP2C9 markedly affect the safety and effectiveness of many drugs, which might lead to adverse reactions and therapeutic failure. Twenty-four novel CYP2C9 variants (*36-*60) had been previously discovered via gene sequencing in the Han population. Our study aims to evaluate the impact of 38 CYP2C9 variants from the Chinese population on valsartan metabolism compared with CYP2C9*1 in vitro.Wild-type CYP2C9*1 and other CYP2C9 variants were expressed in Spodoptera frugiperda 21 insect cells. Incubations were performed at 37 °C with 20-2000 μM substrate for 30 min. The metabolite 4-OH valsartan was determined via UPLC-MS/MS.Among the 38 CYP2C9 variants, the enzymatic activities of most variants were significantly altered compared with the wild-type. Three variants (CYP2C9*27, *40 and *49) exhibited increased intrinsic clearance values (134-153% relative clearance). However, 12 variants (CYP *8, *13, *16, *19, *33, *36, *42, *43, *45, *52, *54, *58) caused90% decreases in the relative clearance of valsartan compared to CYP2C9*1.Our research provides systematic data for evaluating the effects of CYP2C9 variants on valsartan metabolism in the Chinese population. These results will expand our understanding of the impact of CYP2C9 genetic polymorphisms on valsartan metabolism and will contribute to precision medicine.
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- 2022
116. Collision Fluctuations of Lucky Droplets with Superdroplets.
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XIANG-YU LI, MEHLIG, BERNHARD, SVENSSON, GUNILLA, BRANDENBURG, AXEL, and HAUGEN, NILS E. L.
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DROPLETS , *CLOUD droplets , *OPEN-ended questions , *COAGULATION - Abstract
It was previously shown that the superdroplet algorithm for modeling the collision–coalescence process can faithfully represent mean droplet growth in turbulent clouds. An open question is how accurately the superdroplet algorithm accounts for fluctuations in the collisional aggregation process. Such fluctuations are particularly important in dilute suspensions. Even in the absence of turbulence, Poisson fluctuations of collision times in dilute suspensions may result in substantial variations in the growth process, resulting in a broad distribution of growth times to reach a certain droplet size. We quantify the accuracy of the superdroplet algorithm in describing the fluctuating growth history of a larger droplet that settles under the effect of gravity in a quiescent fluid and collides with a dilute suspension of smaller droplets that were initially randomly distributed in space (“lucky droplet model”). We assess the effect of fluctuations upon the growth history of the lucky droplet and compute the distribution of cumulative collision times. The latter is shown to be sensitive enough to detect the subtle increase of fluctuations associated with collisions between multiple lucky droplets. The superdroplet algorithm incorporates fluctuations in two distinct ways: through the random spatial distribution of superdroplets and through the Monte Carlo collision algorithm involved. Using specifically designed numerical experiments, we show that both on their own give an accurate representation of fluctuations. We conclude that the superdroplet algorithm can faithfully represent fluctuations in the coagulation of droplets driven by gravity. [ABSTRACT FROM AUTHOR]
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- 2022
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117. Dust growth by accretion of molecules in supersonic interstellar turbulence
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Lars Mattsson and Xiang-Yu Li
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Physics ,010504 meteorology & atmospheric sciences ,Turbulence ,Molecular cloud ,FOS: Physical sciences ,Astronomy and Astrophysics ,01 natural sciences ,Astrophysics - Astrophysics of Galaxies ,Accretion (astrophysics) ,Computational physics ,Grain growth ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,0103 physical sciences ,Log-normal distribution ,Compressibility ,Supersonic speed ,Growth rate ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,0105 earth and related environmental sciences - Abstract
We show that the growth rate of dust grains in cold molecular clouds is enhanced by the high degree of compressibility of a turbulent, dilute gas. By means of high-resolution (10243) numerical simulations, we confirm the theory that the spatial mean growth rate is proportional to the gas-density variance. This also results in broadening of the grain-size distribution (GSD) due to turbulence-induced variation of the grain-growth rate. We show, for the first time in a detailed numerical simulation of hydrodynamic turbulence, that the GSD evolves toward a shape that is a reflection of the gas-density distribution, regardless of the initial distribution. That is, in case of isothermal, rotationally forced turbulence, the GSD tends to be a lognormal distribution. We also show that in hypersonic turbulence, decoupling of gas and dust becomes important and that this leads to an even further accelerated grain growth.
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- 2020
118. Clinical Characteristics and Blood Test Results in COVID-19 Patients
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Xu-Sheng, An, Xiang-Yu, Li, Fu-Tai, Shang, Shu-Feng, Yang, Jun-Yan, Zhao, Xiao-Zhong, Yang, and Hong-Gang, Wang
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Adult ,Male ,Fever ,SARS-CoV-2 ,Pneumonia, Viral ,COVID-19 ,Leukopenia ,Middle Aged ,Prognosis ,Betacoronavirus ,Cough ,Lymphopenia ,Humans ,Female ,Coronavirus Infections ,Pandemics ,Biomarkers - Abstract
An outbreak of pneumonia named COVID-19 caused by a novel coronavirus in Wuhan is rapidly spreading worldwide. The objective of the present study was to clarify further the clinical characteristics and blood parameters in COVID-19 patients.Twenty-three suspected patients and 64 patients with laboratory-confirmed SARS-Cov-2 infection were admitted to a designated hospital. Epidemiological, clinical, laboratory, and treatment data were collected and analyzed.Of the 64 patients studied, 47 (73.4%) had been exposed to a confirmed source of COVID-19 transmission. On admission, the most common symptoms were fever (75%) and cough (76.6%). Twenty-eight (43.8%) COVID-19 patients showed leukopenia, 10 (15.6%) showed lymphopenia, 47 (73.4%) and 41 (64.1%) had elevated high-sensitivity C-reactive protein (hsCRP) and erythrocyte sedimentation rate (ESR), respectively, and 30 (46.9%) had increased fibrinogen concentration. After the treatment, the counts of white blood cells and platelets, and the level of prealbumin increased significantly, while aspartate aminotransferase (AST), lactate dehydrogenase (LDH), and hsCRP decreased. COVID-19 patients with the hospital stay longer than 12 days had higher body mass index (BMI) and increased levels of AST, LDH, fibrinogen, hsCRP, and ESR.Results of blood tests have potential clinical value in COVID-19 patients.
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- 2020
119. The value of contrast-enhanced three-dimensional isotropic T2-weighted turbo spin-echo SPACE sequence in the diagnosis of patients with lumbosacral nerve root compression
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Chao, Kong, Xiang-Yu, Li, Si-Yuan, Sun, Xiang-Yao, Sun, Miao, Zhang, Zheng, Sun, Yu, Wang, Jie, Lu, and Shi-Bao, Lu
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Imaging, Three-Dimensional ,Humans ,Radiculopathy ,Magnetic Resonance Imaging ,Sensitivity and Specificity ,Spine - Abstract
To investigate the diagnostic value of contrast-enhanced three-dimensional (3D) T2-weighted turbo spin-echo SPACE (T2-SPACE) sequence in LNRC.A total of 90 surgically confirmed LNRC patients with 165 explored nerve roots were enrolled in this study. Diagnostic values were quantified using sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), and accuracy. The consistency between 2D MRI and 3D T2-SPACE MRI was quantified using kappa test. The compression of specific branch in nerve root was evaluated on 2D MRI, 3D T2-SPACE MRI, and surgical findings. The pedicle height, vertebral body height (VH), proximal tilting angle of nerve root (PTA) were measured on MR images.The sensitivity, specificity, PPV, NPV, and accuracy by 2D MRI were 78.3%, 72.7%, 94.9%, 34.0%, and 77.6%, respectively. For 3D T2-SPACE MRI imaging, the sensitivity, specificity, PPV, NPV, and accuracy were 91.6%, 86.4%, 97.8%, 61.3%, and 90.9%, respectively. 2D MRI and 3D T2-SPACE MRI for detection of intra-foramen and extra-foramen nerve compression showed poor homogeneity (Kappa = 0.333, Kappa = 0.276, respectively). Smaller VHs and larger PTAs could be indicators for the diagnosis of foraminal nerve root compression.3D T2-SPACE MRI had a higher sensitivity, specificity, PPV, NPV, and accuracy than 2D MRI for detecting LNRC. The 3D T2-SPACE scan could be a good substitute to routine 2D MRI in LNRC diagnosis, especially for foraminal nerve root compression patients.III.
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- 2020
120. The occurrence of diarrhea in COVID-19 patients
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Shang-Nong Wu, Xiang-Yu Li, Weijie Dai, Xiao-Zhong Yang, and Hong-Gang Wang
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Diarrhea ,2019-20 coronavirus outbreak ,Coronavirus disease 2019 (COVID-19) ,Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) ,Pneumonia, Viral ,Article ,Betacoronavirus ,Feces ,Occurrence ,Pandemic ,medicine ,Humans ,Medical Waste Disposal ,Pandemics ,biology ,Hepatology ,Viral Epidemiology ,business.industry ,SARS-CoV-2 ,Gastroenterology ,COVID-19 ,biology.organism_classification ,medicine.disease ,Virology ,Pneumonia ,medicine.symptom ,business ,Coronavirus Infections - Published
- 2020
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121. Elevated serum aspartate aminotransferase level identifies patients with coronavirus disease 2019 and predicts the length of hospital stay
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Xuexiang Gu, Shu-Feng Yang, Xiang-Yu Li, Xiao-Zhong Yang, Shang-Nong Wu, Xu-Sheng An, and Hong-Gang Wang
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0301 basic medicine ,Male ,Clinical Biochemistry ,Gastroenterology ,0302 clinical medicine ,aspartate aminotransferase ,Liver Function Tests ,Immunology and Allergy ,Research Articles ,biology ,medicine.diagnostic_test ,Fatty liver ,Hematology ,Middle Aged ,hospital stay ,Medical Laboratory Technology ,Liver ,030220 oncology & carcinogenesis ,Female ,Coronavirus Infections ,Research Article ,Microbiology (medical) ,Adult ,medicine.medical_specialty ,Coronavirus disease 2019 (COVID-19) ,Pneumonia, Viral ,Serum albumin ,03 medical and health sciences ,Betacoronavirus ,COVID‐19 ,Internal medicine ,medicine ,liver blood test ,Blood test ,Humans ,Clinical significance ,Aspartate Aminotransferases ,Pandemics ,Biochemistry, medical ,business.industry ,SARS-CoV-2 ,Biochemistry (medical) ,Public Health, Environmental and Occupational Health ,COVID-19 ,Length of Stay ,medicine.disease ,030104 developmental biology ,Alanine transaminase ,biology.protein ,fatty liver disease ,Liver function tests ,business ,Hospital stay - Abstract
Background Coronavirus disease 2019 (COVID‐19) has become a worldwide public health emergency. This study aimed to investigate the clinical significance of liver blood tests in COVID‐19 patients. Methods The analysis included clinical data of 23 patients with suspected COVID‐19 and 66 patients with confirmed COVID‐19 from January 25 to February 20, 2020. The relationship between liver blood test results, liver condition (HBsAb positive, HBcAb positive, and fatty liver disease), and duration of hospital stay among COVID‐19 patients was analyzed. Results The median hospital stay of COVID‐19 patients was 6 days. Serum albumin (Alb) level was lower in patients with COVID‐19 confirmed on admission than in patients with suspected COVID‐19 (40.08 g/L vs 42.50 g/L, P = .016), while the level of aspartate aminotransferase (AST) was higher (23 U/L vs 18 U/L, P = .005). Abnormal results of liver blood tests in patients with COVID‐19 included increased levels of alanine transaminase (ALT) (21.2%, 14 patients), AST (15.2%, 10 patients), and gamma‐glutamyl transpeptidase (GGT) (22.7%, 15 patients). After 5‐10 days of treatment, levels of Alb and AST in COVID‐19 patients were significantly decreased (P .05). In addition, only levels of AST were positively correlated with the duration of hospital stay (r = .334, P = .007). Conclusion Abnormal results of the liver blood test were found in COVID‐19 patients. The COVID‐19 patients on admission with the higher levels of AST might have longer hospital stays.
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- 2020
122. Diarrhoea after treatment: an adverse drug reaction in patients with COVID-19
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Ying Wang, Xiao-Zhong Yang, Hong-Gang Wang, Shu-Feng Yang, Xu-Sheng An, Peng Shen, and Xiang-Yu Li
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medicine.medical_specialty ,Coronavirus disease 2019 (COVID-19) ,immune system diseases ,business.industry ,Internal medicine ,digestive, oral, and skin physiology ,virus diseases ,Medicine ,In patient ,business ,medicine.disease ,Adverse drug reaction ,After treatment - Abstract
The coronavirus disease (COVID-19) is currently prevalent worldwide. We analysed the occurrence of diarrhoea of these patients after treatment. All patients were treated with nebulised α-interferon and oral administration of Lopinavir/Ritonavir tablets. Of the 62 patients, 38 (61.3%) developed diarrhoea after treatment. Of these 38 cases, 63.2% (24/38 cases) had their first diarrhoea within 24 hours after medication. Only 13.2% (5/38 cases) had more than 5 bowel movements per day with a maximum of 10 per day. Patients with diarrhoea had lower white blood cell counts. Leukopenia was a risk factor for the development of diarrhoea. We conclude that COVID-19 patients had a relatively high rate of diarrhoea after treatment. Lopinavir/Ritonavir was speculated to contribute to diarrhea, which is a common adverse drug reaction to Lopinavir/Ritonavir. Patients with reduced white blood cell counts at admission may be more likely to develop diarrhoea after admission.
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- 2020
123. Coagulation of inertial particles in supersonic turbulence
- Author
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Xiang-Yu Li and Lars Mattsson
- Subjects
Physics ,Earth and Planetary Astrophysics (astro-ph.EP) ,Range (particle radiation) ,Turbulence ,High Energy Physics::Phenomenology ,Time evolution ,Fluid Dynamics (physics.flu-dyn) ,FOS: Physical sciences ,Astronomy and Astrophysics ,Mechanics ,Astrophysics ,Physics - Fluid Dynamics ,Astrophysics - Astrophysics of Galaxies ,Nonlinear Sciences::Chaotic Dynamics ,Physics::Fluid Dynamics ,symbols.namesake ,Mach number ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,Particle-size distribution ,Compressibility ,symbols ,Coagulation (water treatment) ,Supersonic speed ,Astrophysics - Earth and Planetary Astrophysics - Abstract
Coagulation driven by supersonic turbulence is primarily an astrophysical problem because coagulation processes on Earth are normally associated with incompressible fluid flows at low Mach numbers, while dust aggregation in the interstellar medium for instance is an example of the opposite regime. We study coagulation of inertial particles in compressible turbulence using high-resolution direct and shock-capturing numerical simulations with a wide range of Mach numbers from nearly incompressible to moderately supersonic. The particle dynamics is simulated by representative particles and the effects on the size distribution and coagulation rate due to increasing Mach number is explored. We show that the time evolution of particle size distribution mainly depends on the compressibility (Mach number). We find that the average coagulation kernel ⟨Cij⟩ scales linearly with the average Mach number ℳrms multiplied by the combined size of the colliding particles, that is, 〈Cij〉∼〈(ai+aj)3〉 ℳrmsτη−1, which is qualitatively consistent with expectations from analytical estimates. A quantitative correction 〈Cij〉∼〈(ai+aj)3〉(vp,rms/cs)τη−1 is proposed and can serve as a benchmark for future studies. We argue that the coagulation rate ⟨Rc⟩ is also enhanced by compressibility-induced compaction of particles.
- Published
- 2020
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124. TNFSF14, a novel target of miR-326, facilitates airway remodeling in airway smooth muscle cells via inducing extracellular matrix protein deposition and proliferation
- Author
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Huan-Li Yan, Yi-Nan Guo, Xiang-Yu Li, and Hui Zhang
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Tumor Necrosis Factor Ligand Superfamily Member 14 ,extracellular matrix deposition ,Myocytes, Smooth Muscle ,Primary Cell Culture ,Collagen Type I ,Extracellular matrix ,Transforming Growth Factor beta1 ,03 medical and health sciences ,0302 clinical medicine ,Genes, Reporter ,medicine ,Humans ,Luciferase ,Luciferases ,Base Pairing ,Cell Proliferation ,TNFSF14 ,lcsh:R5-920 ,Viral matrix protein ,Oligoribonucleotides ,airway smooth muscle cells ,biology ,Base Sequence ,business.industry ,Cell growth ,Respiratory disease ,Molecular Mimicry ,miR‐326 ,General Medicine ,asthma ,medicine.disease ,Cell biology ,Extracellular Matrix ,Fibronectins ,Fibronectin ,Trachea ,MicroRNAs ,Gene Expression Regulation ,030220 oncology & carcinogenesis ,biology.protein ,Airway Remodeling ,030211 gastroenterology & hepatology ,Tumor necrosis factor alpha ,lcsh:Medicine (General) ,Airway ,business ,Signal Transduction - Abstract
As a common chronic respiratory disease, the incidence of asthma is increasing in recent years worldwide. Airway remodeling is the primary pathological basis of refractory asthma, but the studies about the underlying mechanism of airway remodeling was a lack. In the study, we aimed to investigate the effects and mechanisms of miR‐326 on airway remodeling in airway smooth muscle cells (ASMCs). The results showed that transforming growth factor‐β1 (TGF‐β1) accelerated matrix protein deposition by increasing the expression levels of collagen I and fibronectin, and promoted proliferative ability of ASMCs. However, miR‐326 was significantly downregulated in TGF‐β1‐treated ASMCs. MiR‐326 mimics robustly decreased the collagen I and fibronectin levels and inhibited cell proliferation of TGF‐β1‐treated ASMCs. Luciferase assay investigated that tumor necrosis factor superfamily member 14 (TNFSF14) was a direct target of miR‐326. The expression of TNFSF14 was negatively regulated by miR‐326. Moreover, exogenous TNFSF14 effectively reversed the inhibitory effects of miR‐326 overexpression on the expression levels of collagen I and fibronectin, and promoted cell proliferation of TGF‐β1‐treated ASMCs. In conclusion, miR‐326 suppressed matrix protein deposition and cell proliferation of TGF‐β1‐treated ASMCs via inhibiting TNFSF14. MiR‐326 might be a promising novel therapeutic target for asthma.
- Published
- 2019
125. Reliability analysis of phased mission system with non-exponential and partially repairable components
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Hong-Zhong Huang, Xiang-Yu Li, and Yan-Feng Li
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0209 industrial biotechnology ,021103 operations research ,Computer science ,business.industry ,Process (engineering) ,0211 other engineering and technologies ,Approximation algorithm ,Markov process ,02 engineering and technology ,Mechatronics ,Industrial and Manufacturing Engineering ,Reliability engineering ,symbols.namesake ,020901 industrial engineering & automation ,Control system ,Orbit (dynamics) ,symbols ,Safety, Risk, Reliability and Quality ,Aerospace ,business ,Reliability (statistics) - Abstract
Phased mission systems (PMSs) have wide applications in engineering practices, especially in aerospace industry such as man-made satellite and spacecraft. To achieve high reliability in a PMS, certain critical parts in the system are designed to have a redundant architecture, such as cold standby (structural or functional). State-space models such as Markov processes have been widely used in previous studies to evaluate the reliabilities of these systems. But in practice, many real systems consist of mechanical components or mechatronics whose lifetime follow non-exponential distributions like the Weibull distribution. In this type of system, the Markov process is not capable of modeling the system behavior. In this paper, the SMP (Semi-Markov Process) is applied to solve the problem that the components’ lifetime in dynamic systems follows non-exponential distributions. An approximation algorithm for the SMP is proposed to assess the reliability of the PMSs consisting of non-exponential components. Furthermore, the accuracy and calculation efficiency of the approximation algorithm are explored. At last, the reliability assessment of a complex multi-phased altitude and orbit control system (AOCS) in a man-made satellite is presented to illustrate the method.
- Published
- 2018
126. Solid-phase extraction of tobacco-specific N-nitrosamines with a mixed-mode hydrophobic/cation-exchange sorbent
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Feng-Peng Zhu, Xing-Yi Jiang, Yan-Bo Luo, Hong-Fei Zhang, Yu-Qi Feng, Yong-Qiang Pang, Xiang-Yu Li, and Hu Shaodong
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Sorbent ,Chemistry ,010401 analytical chemistry ,Inorganic chemistry ,N nitrosamines ,02 engineering and technology ,Solid phase extraction ,021001 nanoscience & nanotechnology ,0210 nano-technology ,Mixed mode ,01 natural sciences ,0104 chemical sciences - Published
- 2018
127. Free and forced vibrations of nanowires on elastic substrates
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Guang-Yuan Su, Ralf Müller, Ying-Xu Li, and Xiang-Yu Li
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Surface (mathematics) ,Work (thermodynamics) ,Materials science ,Laplace transform ,Mechanical Engineering ,Nanowire ,02 engineering and technology ,Mechanics ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Vibration ,Transverse plane ,020303 mechanical engineering & transports ,0203 mechanical engineering ,Mechanics of Materials ,Normal mode ,General Materials Science ,Boundary value problem ,0210 nano-technology ,Civil and Structural Engineering - Abstract
This work aims to study the free and forced transverse vibrations of a nanowire on elastic substrate, in a systematic way. To this end, the governing equations are obtained from an updated mechanical model integrating the effects of surface and elastic substrate. The Winkler, Pasternak and Generalized substrate models are taken into consideration to characterize various substrates. The characteristic equations, mode shapes and effective Young’s moduli are determined for nanowires with three typical boundary conditions: simply supported, clamped-clamped and clamped-free. The Laplace transform is employed to derive the exact solutions for forced vibrations of the three typical nanowires. Numerical calculations are performed to validate the proposed solutions and to analyze the effects of surface and elastic substrates on the free and forced vibrations.
- Published
- 2018
128. Copper-catalyzed diastereoselective synthesis of β-boryl-α-quaternary carbon carboxylic esters
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An-Ling Zhang, Ya-Jie Zuo, Xiang-Yu Li, Zhuoran Zhong, Ruihu Song, Yuwei Chang, Yinkun Fan, Xinpeng Fu, Chong-Min Zhong, and Xiao-Lu Chen
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010405 organic chemistry ,Aryl ,Potassium ,Organic Chemistry ,Substituent ,chemistry.chemical_element ,Crystal structure ,010402 general chemistry ,01 natural sciences ,Biochemistry ,Medicinal chemistry ,Copper ,0104 chemical sciences ,chemistry.chemical_compound ,chemistry ,Electrophile ,Physical and Theoretical Chemistry ,Carbon ,Derivative (chemistry) - Abstract
Cu(I)-Catalyzed diastereoselective carboboration of α-alkyl-substituted α,β-unsaturated carboxylic esters to produce β-boryl-α-quaternary carbon esters was developed. The carbon skeletons of dialkyl sulfates, primary allyl halides, and benzyl bromides were transferred to the α-position of the substrates to provide products in moderate to good yields with a diastereoselectivity of >95% in most cases. Substrates bearing a β-(hetero)aryl substituent gave higher diastereoselectivities than those bearing a linear β-alkyl substituent. The crystal structure of the potassium trifluoroborate derivative shows that the reactions probably go through a copper(I) enolate intermediate and the diastereoselectivity arises from the electrophilic attack of electrophiles to the less hindered side of the enolates.
- Published
- 2018
129. Ca2+/Calmodulin-Dependent Protein Kinase II γ-Dependent Serine727 Phosphorylation Is Required for TMEM16A Ca2+-Activated Cl− Channel Regulation in Cerebrovascular Cells
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Xiang-Yu Li, Ming-Ming Ma, Xiaofei Lv, Guan-Lei Wang, Yong-Yuan Guan, Cai-Xia Lin, Feng Yuan, Jia-Guo Zhou, and Can-Zhao Liu
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0301 basic medicine ,Gene isoform ,Small interfering RNA ,Chemistry ,General Medicine ,030204 cardiovascular system & hematology ,Angiotensin II ,Cell biology ,Serine ,03 medical and health sciences ,030104 developmental biology ,0302 clinical medicine ,Biochemistry ,Ca2+/calmodulin-dependent protein kinase ,Chloride channel ,Phosphorylation ,Patch clamp ,Cardiology and Cardiovascular Medicine - Abstract
Background TMEM16A is a critical component of Ca2+-activated chloride channels (CaCCs) and mediates basilar arterial smooth muscle cell (BASMC) proliferation in hypertensive cerebrovascular remodeling. CaMKII is a negative regulator of CaCC, and four CaMKII isoforms (α, β, γ and δ) are expressed in vasculature; however, it is unknown which and how CaMKII isoforms affect TMEM16A-associated CaCC and BASMC proliferation.Methods and Results:Patch clamp and small interfering RNA (siRNA) knockdown of different CaMKII isoforms revealed that only CaMKIIγ inhibited native Ca2+-activated chloride currents (ICl.Ca) in BASMCs. The TMEM16A overexpression evoked TMEM16A Cl-current and inhibited angiotensin II (Ang II)-induced proliferation in BASMCs. The co-immunoprecipitation and pull-down assay indicated an interaction between CaMKIIγ and TMEM16A protein. TMEM16A Cl-current was modulated by CaMKIIγ phosphorylation at serine residues in TMEM16A. Serine525 and Serine727 in TMEM16A were mutated to alanine, and only mutation at Ser727 (S727A) reversed the CaMKIIγ inhibition of the TMEM16A Cl-current. Phosphomimetic mutation S727D markedly decreased TMEM16A Cl-current and reversed TMEM16A-mediated suppression of BASMC proliferation, mimicking the inhibitory effects of CaMKIIγ on TMEM16A. A significant increase in CaMKIIγ isoform content was observed in parallel to the decrease of TMEM16A and ICl.Cain basilar artery proliferative remodeling in Ang II-infused mice. Conclusions Serine 727 phosphorylation in TMEM16A by CaMKIIγ provides a new mechanism for regulating TMEM16A CaCC activity and Ang II-induced BASMC proliferation.
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- 2018
130. The Ratio of Plasma and Urinary 8-oxo-Gsn Could Be a Novel Evaluation Index for Patients with Chronic Kidney Disease
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Li Qun Zhang, Ban Zhao, Yong Hui Mao, Sadayoshi Ito, Leng Nan Xu, Zhe Chen, Qing Hua Weng, Ming Zhang Zuo, Jian Ping Cai, Xiang-yu Li, Ji Hong Hu, and Jing Jing Nie
- Subjects
Adult ,Male ,0301 basic medicine ,Aging ,medicine.medical_specialty ,Article Subject ,Urinary system ,Urology ,Renal function ,Urine ,medicine.disease_cause ,Biochemistry ,Young Adult ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Tandem Mass Spectrometry ,medicine ,Humans ,Deoxyguanosine ,heterocyclic compounds ,Renal Insufficiency, Chronic ,lcsh:QH573-671 ,Aged ,Aged, 80 and over ,Creatinine ,Guanosine ,lcsh:Cytology ,business.industry ,Cell Biology ,General Medicine ,Middle Aged ,medicine.disease ,Pathophysiology ,030104 developmental biology ,chemistry ,Female ,Reactive Oxygen Species ,business ,030217 neurology & neurosurgery ,Oxidative stress ,Research Article ,Chromatography, Liquid ,Kidney disease - Abstract
Nucleic acid oxidation plays an important role in the pathophysiology progress of a variety of diseases. 8-oxo-7,8-dihydro-2′-deoxyguanosine (8-oxo-dGsn) and 8-oxo-7,8-dihydroguanosine (8-oxo-Gsn), which originate from DNA and RNA oxidation, were the most widely used indicators for oxidative stress. The study investigated the relation between 8-oxo-dGsn, 8-oxo-Gsn, and CKD. 146 patients with CKD were divided into five disease stages, and their fasting blood and morning urine were collected. The levels of 8-oxo-dGsn and 8-oxo-Gsn in plasma and urine were quantified by LC-MS/MS. The ratio of urinary 8-oxo-Gsn to creatinine increased from stages 1 to 4 corresponding to the increased severity of CKD, but it decreased in stage 5. And plasma 8-oxo-Gsn gradually increased with the decline of renal function. In particular, the increased ratio of plasma and urine 8-oxo-Gsn in stage 5 exceeded the concentration of creatinine. This trend was similar to the estimated glomerular filtration rate (eGFR), which indicates that 8-oxo-Gsn could be an appropriate indicator for renal function. Our finding indicates that as the disease progresses, RNA oxidation is increased. The significant increase in the ratio of plasma and urinary 8-oxo-Gsn is a novel evaluation index of end-stage renal disease.
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- 2018
131. Effects of cover crops on beetle assemblages in tea plantations
- Author
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Minsheng You, Li Lei, Gabor Pozsgai, Xiang-Yu Li, Gadi V. P. Reddy, and Chen Lilin
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Integrated pest management ,Diversity ,Biomass (ecology) ,biology ,ved/biology ,business.industry ,fungi ,ved/biology.organism_classification_rank.species ,Pest control ,food and beverages ,Chamaecrista rotundifolia ,biology.organism_classification ,Groundcover ,Coleoptera ,Intercropping ,Agronomy ,Abundance (ecology) ,Sustainable Tea Production ,Trophic Groups ,Species richness ,business ,Agronomy and Crop Science ,Paspalum notatum - Abstract
Coleoptera are visible members of food webs in tea plantations, with high species richness and abundance. Many tea pests, as well as natural enemies, are members of this order, so a knowledge of how groundcovers affect beetles can aid pest management. We collected beetles in a replicated field experiment in the Wuyi Mountains, Fujian Province, China. Tea was intercropped with Paspalum notatum or Chamaecrista rotundifolia, or rows were cleared to bare ground, or in the control they were left unmanaged to allow weeds to grow naturally. Sampling, done by sweep netting and vegetation beating, was conducted monthly, between May 2006 and April 2008, and Coleoptera abundance, biomass, species richness and assemblage structures were compared between groundcover treatments. Total beetle abundance and species richness were significantly higher in tea intercropped with C. rotundifolia and bare ground than in naturally grown weedy control. Whilst there was no difference between predator assemblages among treatments for any measure, herbivores were more abundant, weighed more, and were more diverse in C. rotundifolia treatments than in weedy control. Biomass and species richness were also greater in plots with P. notatum groundcover than those in weedy control. We found that beetle assemblages varied both seasonally and with ground cover treatment, but the potential pest control impact of more species-rich beetle assemblages was mixed, and further work is needed to gain information on trophic groups with potential benefits for use in non-insecticidal pest management. This work was supported by the National Natural Science Foundation of China (No. 31501650), National Key R & D Program of China (No. 2016YFD0200900), Fujian Agriculture and Forestry University Construction Project for Technological Innovation and Service System of Tea Industry Chain (No. K1520005 A03), Fujian Spark Program (No. 2018S0019), “111” Program: Innovation Center for Ecologically Based Pest Management of Subtropical Crops (No. D16012). info:eu-repo/semantics/publishedVersion
- Published
- 2021
132. A Markov regenerative process model for phased mission systems under internal degradation and external shocks
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Hong-Zhong Huang, Xiang-Yu Li, Yan-Feng Li, and Xiaoyan Xiong
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021110 strategic, defence & security studies ,021103 operations research ,Spacecraft ,business.industry ,Computer science ,Monte Carlo method ,0211 other engineering and technologies ,02 engineering and technology ,Modular design ,Industrial and Manufacturing Engineering ,Shock (mechanics) ,Reliability engineering ,Reliability (semiconductor) ,Range (statistics) ,Electronics ,Safety, Risk, Reliability and Quality ,business ,Degradation (telecommunications) - Abstract
Recently, phased mission systems (PMSs) have been widely studied due to their wide range of applications, such as man-made satellites or spacecraft. The lifetime of the PMSs can be separated into several phases, in which their tasks, system configurations, and failure criteria could be different. Meanwhile, the randomly occurred shocks, such as the space radiation from outer space, will cause additional wear and fatal damage on the electronic devices in these systems, which will obviously affect the system reliability. To consider these shocks’ effect in the reliability modeling of the PMSs, a Markov regenerative process (MRGP) based model is proposed in this paper. Firstly, shock models for components and the basic conceptions of MRGP are introduced. Then, a simple cold standby system is used to show the proposed MRGP model for systems under mixed shocks. And a Monte Carlo simulation procedure is applied to verify the results. At last, by integrating the proposed MRGP model and the modular method for PMSs, the reliability of an AOCS in a spacecraft is assessed to show the proposed method.
- Published
- 2021
133. Effect of high-thermal conductivity epoxy resin on heat dissipation performance of saturated reactor
- Author
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Zhi-Min Dang, Si-Jiao Wang, Jun-Wei Zha, Zhang Chong, Xiang-Yu Li, and Shao-Long Zhong
- Subjects
010302 applied physics ,Convection ,Materials science ,02 engineering and technology ,Epoxy ,Conductivity ,021001 nanoscience & nanotechnology ,Thermal conduction ,01 natural sciences ,Thermal conductivity ,Thermal radiation ,visual_art ,0103 physical sciences ,Heat transfer ,Water cooling ,visual_art.visual_art_medium ,Electrical and Electronic Engineering ,Composite material ,0210 nano-technology - Abstract
The saturated reactor is used in the DC converter valve to protect thyristors. A fluid-solid coupling heat dissipation model was established for the saturated reactor in this study, which included water cooling, heat conduction, heat convection and heat radiation. By the means of finite element method, the temperature and flow field distribution were calculated, which indicated that the low thermal conductivity of epoxy resin hinders the heat dissipation of the saturated reactor. To research effects of thermal conductivity on heat dissipation, the heat dissipation performance of saturated reactor with different epoxy resins was numerical simulated by using this model. The results showed that the heat dissipation performance of the saturated reactor can be effectively improved by the rise of the thermal conductivity of epoxy resin, but the marginal benefit of increasing the thermal conductivity of epoxy resin is gradually reduced. Meanwhile, high-thermal conductivity epoxy resin could have the longer service life under the same operation conditions.
- Published
- 2017
134. Monomorphic epitropic intestinal T-cell lymphoma presenting with intestinal perforation
- Author
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Yong-Sheng Zhang, De-Tong Kong, Min Zhang, and Xiang-Yu Liu
- Subjects
Surgery ,RD1-811 - Published
- 2024
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135. In silico prediction of immune-escaping hot spots for future COVID-19 vaccine design
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Sing-Han Huang, Yi-Ting Chen, Xiang-Yu Lin, Yi-Yi Ly, Ssu-Ting Lien, Pei-Hsin Chen, Cheng-Tang Wang, Suh-Chin Wu, Chwen-Cheng Chen, and Ching-Yung Lin
- Subjects
Medicine ,Science - Abstract
Abstract The COVID-19 pandemic has had a widespread impact on a global scale, and the evolution of considerable dominants has already taken place. Some variants contained certain key mutations located on the receptor binding domain (RBD) of spike protein, such as E484K and N501Y. It is increasingly worrying that these variants could impair the efficacy of current vaccines or therapies. Therefore, analyzing and predicting the high-risk mutations of SARS-CoV-2 spike glycoprotein is crucial to design future vaccines against the different variants. In this work, we proposed an in silico approach, immune-escaping score (IES), to predict high-risk immune-escaping hot spots on the receptor-binding domain (RBD), implemented through integrated delta binding free energy measured by computational mutagenesis of spike-antibody complexes and mutation frequency calculated from viral genome sequencing data. We identified 23 potentially immune-escaping mutations on the RBD by using IES, nine of which occurred in omicron variants (R346K, K417N, N440K, L452Q, L452R, S477N, T478K, F490S, and N501Y), despite our dataset being curated before the omicron first appeared. The highest immune-escaping score (IES = 1) was found for E484K, which agrees with recent studies stating that the mutation significantly reduced the efficacy of neutralization antibodies. Furthermore, our predicted delta binding free energy and IES show a high correlation with high-throughput deep mutational scanning data (Pearson’s r = 0.70) and experimentally measured neutralization titers data (mean Pearson’s r = −0.80). In summary, our work presents a new method to identify the potentially immune-escaping mutations on the RBD and provides valuable insights into future COVID-19 vaccine design.
- Published
- 2023
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- View/download PDF
136. The Implication of AMPA Receptor in Synaptic Plasticity Impairment and Intellectual Disability in Fragile X Syndrome
- Author
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Dan Liu, Shawn M. McClintock, Ya Die Xiang, Xiang Yu Li, Yan Zeng, and Gui Rong Cheng
- Subjects
0301 basic medicine ,congenital, hereditary, and neonatal diseases and abnormalities ,Physiology ,AMPA receptor ,Biology ,Neurotransmission ,Synapse ,03 medical and health sciences ,0302 clinical medicine ,Intellectual Disability ,Intellectual disability ,medicine ,Animals ,Humans ,Receptors, AMPA ,Neuronal Plasticity ,Glutamate receptor ,General Medicine ,medicine.disease ,Fragile X syndrome ,Protein Transport ,030104 developmental biology ,nervous system ,Fragile X Syndrome ,Mutation ,Synaptic plasticity ,Autism ,Neuroscience ,030217 neurology & neurosurgery - Abstract
Fragile X syndrome (FXS) is the most frequently inherited form of intellectual disability and prevalent single-gene cause of autism. A priority of FXS research is to determine the molecular mechanisms underlying the cognitive and social functioning impairments in humans and the FXS mouse model. Glutamate ionotropic alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) receptors (AMPARs) mediate a majority of fast excitatory neurotransmission in the central nervous system and are critically important for nearly all aspects of brain function, including neuronal development, synaptic plasticity, and learning and memory. Both preclinical and clinical studies have indicated that expression, trafficking, and functions of AMPARs are altered and result in altered synapse development and plasticity, cognitive impairment, and poor mental health in FXS. In this review, we discuss the contribution of AMPARs to disorders of FXS by highlighting recent research advances with a specific focus on change in AMPARs expression, trafficking, and dependent synaptic plasticity. Since changes in synaptic strength underlie the basis of learning, development, and disease, we suggest that the current knowledge base of AMPARs has reached a unique point to permit a comprehensive re-evaluation of their roles in FXS.
- Published
- 2017
137. Three-dimensional fundamental solution of a penny-shaped crack in an infinite thermo-magneto-electro-elastic medium with transverse isotropy
- Author
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Guozheng Kang, Ralf Müller, Xiang-Yu Li, and Peidong Li
- Subjects
Materials science ,Field (physics) ,Mechanical Engineering ,Boundary (topology) ,Fracture mechanics ,02 engineering and technology ,Mechanics ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Potential theory ,020303 mechanical engineering & transports ,Classical mechanics ,0203 mechanical engineering ,Mechanics of Materials ,Transverse isotropy ,Fundamental solution ,General Materials Science ,0210 nano-technology ,Magneto ,Stress intensity factor ,Civil and Structural Engineering - Abstract
This paper investigates the problem of an infinite multiferroic composite medium weakened by a penny-shaped crack, which is symmetrically subjected to four pairs of generalized loads on the upper and lower surfaces. These loads could be mechanical pressures, electric displacements, magnetic inductions and temperature increments. In view of the magneto-electric properties of the crack surfaces, four mixed boundary problems are formulated. Based on the general solution, the three-dimensional thermo-magneto-electro-elastic coupling field variables in the three-dimensional full space for various boundary cases are explicitly obtained by means of the generalized potential theory method. Some important physical quantities in fracture mechanics, such as the generalized stress intensity factors and the generalized crack surface displacements, are presented as well. Numerical calculations are performed to validate the present solutions and to show the distributions of the 3D coupled fields. The influences of the magneto-electric properties of the crack surfaces on the generalized stresses and stress intensity factors are revealed.
- Published
- 2017
138. Asymmetric Synthesis of cis-3,4-Dihydrocoumarins via [4 + 2] Cycloadditions Catalyzed by Amidine Derivatives
- Author
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Xiaoyan Luo, Xiang Yu Li, Jing Hai Jin, John S. Fossey, and Wei-Ping Deng
- Subjects
Tandem ,010405 organic chemistry ,Stereochemistry ,Chemistry ,education ,Organic Chemistry ,Enantioselective synthesis ,010402 general chemistry ,01 natural sciences ,humanities ,0104 chemical sciences ,Stereocenter ,Catalysis ,Amidine ,chemistry.chemical_compound ,Michael reaction - Abstract
A highly efficient chiral amidine derivative-catalyzed tandem Michael addition/lactonization of carboxylic acids and o-quinone methides (o-QMs) has been developed that enables the asymmetric synthesis of cis-3,4-dihydrocoumarins bearing contiguous tertiary stereogenic centers in high yields with excellent stereoselectivities.
- Published
- 2017
139. Attachment and adhesion force between biogas bubbles and anaerobic granular sludge in the up-flow anaerobic sludge blanket
- Author
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Jian-Lu Duan, Yi-Bing Zhang, Xiang-Yu Li, Lei Wu, Qian Wang, Jing-Ya Ma, Yue Feng, Xian-Zheng Yuan, Yi Han, and Xiaoyu Liu
- Subjects
Environmental Engineering ,Materials science ,Bubble ,0208 environmental biotechnology ,Flow (psychology) ,02 engineering and technology ,010501 environmental sciences ,Blanket ,01 natural sciences ,Waste Disposal, Fluid ,Physics::Fluid Dynamics ,Contact angle ,symbols.namesake ,Bioreactors ,Biogas ,Mass transfer ,Anaerobiosis ,Waste Management and Disposal ,0105 earth and related environmental sciences ,Water Science and Technology ,Civil and Structural Engineering ,Sewage ,Ecological Modeling ,Reynolds number ,Adhesion ,Pollution ,020801 environmental engineering ,Chemical engineering ,Biofuels ,symbols - Abstract
The performance of the up-flow anaerobic sludge blanket (UASB) is significantly governed by the hydrodynamics of the reactor. Though the influence of hydrodynamics on mass transfer, granular size distribution, and biogas production was well studied, the interaction between biogas bubbles and anaerobic granular sludge (AGS) is poorly understood. This study used the impinging-jet technique and bubble probe atomic force microscope (AFM) to investigate the attachment and adhesion force between biogas bubbles (CH4 and CO2) and AGS. The fluxes of normalized CH4 or CO2 bubble-attachment on two kinds of AGS were directly affected by gas velocity and decreased with an increase in the Reynolds number ranged from 40 to 140. The bubble-attachment had a positive linear relationship with the contact angles, ratio of exopolymeric protein and polysaccharide, and hydrophilic functional groups of AGS. A bubble probe AFM was used to explore the adhesion force between a single bubble and AGS. The results indicated that the adhesion force between the bubbles and the two kinds of AGS also decreased with increasing approach velocity. Overall, these results contribute to a new insight into the understanding of interaction between biogas bubbles and AGS in UASB reactors.
- Published
- 2019
140. TMEM16A ameliorates vascular remodeling by suppressing autophagy via inhibiting Bcl-2-p62 complex formation
- Author
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Si-Jia Liang, Cai-Xia Lin, Yong-Yuan Guan, Xue-Lin Zeng, Xiang-Yu Li, Fei-Ran Zhang, Xiao-Chun Lin, Ming-Ming Ma, Can-Zhao Liu, Ya-juan Zhang, Hua-Qing Zheng, Jin-Yan Shang, Jia-Guo Zhou, Xiaofei Lv, and Xiu Liu
- Subjects
0301 basic medicine ,Genetically modified mouse ,Male ,autophagy ,Vascular smooth muscle ,vascular remodeling ,Myocytes, Smooth Muscle ,Medicine (miscellaneous) ,Mice, Transgenic ,030204 cardiovascular system & hematology ,Muscle, Smooth, Vascular ,03 medical and health sciences ,Mice ,0302 clinical medicine ,Downregulation and upregulation ,vacuolar protein sorting 34 ,Cellular catabolic process ,Animals ,Kinase activity ,Pharmacology, Toxicology and Pharmaceutics (miscellaneous) ,PI3K/AKT/mTOR pathway ,Anoctamin-1 ,Cells, Cultured ,smooth muscle cell ,transmembrane member 16A ,Chemistry ,Autophagy ,Angiotensin II ,Class III Phosphatidylinositol 3-Kinases ,Cell biology ,Mice, Inbred C57BL ,030104 developmental biology ,Proto-Oncogene Proteins c-bcl-2 ,cardiovascular system ,Transcription Factor TFIIH ,Research Paper - Abstract
Rationale: Transmembrane member 16A (TMEM16A) is a component of calcium-activated chloride channels that regulate vascular smooth muscle cell (SMC) proliferation and remodeling. Autophagy, a highly conserved cellular catabolic process in eukaryotes, exerts important physiological functions in vascular SMCs. In the current study, we investigated the relationship between TMEM16A and autophagy during vascular remodeling. Methods: We generated a transgenic mouse that overexpresses TMEM16A specifically in vascular SMCs to verify the role of TMEM16A in vascular remodeling. Techniques employed included immunofluorescence, electron microscopy, co-immunoprecipitation, and Western blotting. Results: Autophagy was activated in aortas from angiotensin II (AngII)-induced hypertensive mice with decreased TMEM16A expression. The numbers of light chain 3B (LC3B)-positive puncta in aortas correlated with the medial cross-sectional aorta areas and TMEM16A expression during hypertension. SMC-specific TMEM16A overexpression markedly inhibited AngII-induced autophagy in mouse aortas. Moreover, in mouse aortic SMCs (MASMCs), AngII-induced autophagosome formation and autophagic flux were blocked by TMEM16A upregulation and were promoted by TMEM16A knockdown. The effect of TMEM16A on autophagy was independent of the mTOR pathway, but was associated with reduced kinase activity of the vacuolar protein sorting 34 (VPS34) enzyme. Overexpression of VPS34 attenuated the effect of TMEM16A overexpression on MASMC proliferation, while the effect of TMEM16A downregulation was abrogated by a VPS34 inhibitor. Further, co-immunoprecipitation assays revealed that TMEM16A interacts with p62. TMEM16A overexpression inhibited AngII-induced p62-Bcl-2 binding and enhanced Bcl-2-Beclin-1 interactions, leading to suppression of Beclin-1/VPS34 complex formation. However, TMEM16A downregulation showed the opposite effects. Conclusion: TMEM16A regulates the four-way interaction between p62, Bcl-2, Beclin-1, and VPS34, and coordinately prevents vascular autophagy and remodeling.
- Published
- 2019
141. Synthesis and evaluation of the HIF-1α inhibitory activity of 3(5)-substituted-4-(quinolin-4-yl)- and 4-(2-phenylpyridin-4-yl)pyrazoles as inhibitors of ALK5
- Author
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Zhe Jiang, Xiang-Yu Li, Cheng Hua Jin, Yan-Wei Li, Xuejun Jin, Shanji Li, Li-Min Zhao, Hu-Ri Piao, and Juan Ma
- Subjects
Clinical Biochemistry ,Cell ,Receptor, Transforming Growth Factor-beta Type I ,Pharmaceutical Science ,01 natural sciences ,Biochemistry ,Metastasis ,Drug Discovery ,medicine ,Protein biosynthesis ,Humans ,Molecular Biology ,Transcription factor ,chemistry.chemical_classification ,010405 organic chemistry ,Chemistry ,Kinase ,Organic Chemistry ,medicine.disease ,Hypoxia-Inducible Factor 1, alpha Subunit ,0104 chemical sciences ,010404 medicinal & biomolecular chemistry ,medicine.anatomical_structure ,Enzyme ,Docking (molecular) ,Apoptosis ,Cancer research ,Molecular Medicine - Abstract
The transcription factor hypoxia-inducible factor-1α (HIF-1α) plays an important role in apoptosis, metastasis, and proliferation and is recognized as an important potential therapeutic target for cancer. Six series of 3(5)-(6-methylpyridin-2-yl)-4-(quinolin-4-yl)pyrazoles (11a-d, 12a-d, and 18a-d) and 3(5)-(6-methylpyridin-2-yl)-4-(2-phenyl-pyridin-4-yl)pyrazoles (19a-d, 20a-d, and 21a-d) were synthesized and evaluated for activin receptor-like kinase 5 (ALK5) and HIF-1α inhibitory activity at the enzyme and cell levels. The effect of the lead compound 20d (J-1012) on HIF-1α activation in HCT116 cells was investigated. J-1012 markedly decreased the hypoxia-induced or TNF-induced accumulation of HIF-1α protein dose-dependently. Analysis revealed that J-1012 inhibited HIF-1α protein synthesis, without affecting the degradation of HIF-1α protein. Furthermore, by inhibiting the activation of HIF-1α, J-1012 suppressed the metastasis and proliferation and promoted apoptosis of HCT116 cells. These results suggest that J-1012 may be a potential therapeutic agent against human colon cancer.
- Published
- 2019
142. Lipid Distribution Pattern and Transcriptomic Insights Revealed the Potential Mechanism of Docosahexaenoic Acid Traffics in
- Author
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Xiu-Hong, Yue, Wen-Chao, Chen, Zhi-Ming, Wang, Peng-Yang, Liu, Xiang-Yu, Li, Chu-Bin, Lin, Shu-Huan, Lu, Feng-Hong, Huang, and Xia, Wan
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Docosahexaenoic Acids ,Type C Phospholipases ,1-Acylglycerophosphocholine O-Acyltransferase ,Biological Transport ,Acyl Coenzyme A ,Transcriptome ,Phospholipids ,Stramenopiles ,Triglycerides - Published
- 2019
143. Face Anti-Spoofing Using Texture-Based Techniques and Filtering Methods
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S. M. Hasan Mahmud, Rezwan Hasan, and Xiang Yu Li
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History ,Authentication ,Spoofing attack ,business.industry ,Computer science ,Face Presentation ,Feature vector ,Computer Science Applications ,Education ,TA1650 ,Support vector machine ,Identification (information) ,TK7882.B56 ,Face (geometry) ,Computer vision ,Artificial intelligence ,Face detection ,business - Abstract
User authentication for an accurate biometric system is the demand of the hour in today’s world. When somebody attempts to take on the appearance of another person by introducing a phony face or video before the face detection camera and gets illegitimate access, a face presentation attack usually happens. To effectively protect the privacy of a person, it is very critical to build a face authentication and anti-spoofing system. This paper introduces a novel and appealing face spoof detection technique, which is primarily based on the study of contrast and dynamic texture features of both seized and spoofed photos. Valid identification of photo spoofing is anticipated here. A modified version of the DoG filtering method, and local binary pattern variance (LBPV) based technique, which is invariant to rotation, are designated to be used in this paper. Support vector machine (SVM) is used when feature vectors are extracted for further analysis. The publicly available NUAA photo-imposter database is adapted to test the system, which includes facial images with different illumination and area. The accuracy of the method can be assessed using the false acceptance rate (FAR) and false rejection rate (FRR). The results express that our method performs better on key indices compared to other state-of-the-art techniques following the provided evaluation protocols tested on a similar dataset.
- Published
- 2019
144. Redundancy Allocation Problem of Phased-mission System with Mixed Stand-by Redundancy Strategy
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Yan-Feng Li, Xiang-Yu Li, and Hong-Zhong Huang
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Computer science ,Redundancy (engineering) ,Reliability engineering - Published
- 2019
145. Fault prognosis of Engineered Systems: A Deep Learning Perspective
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Yan-Feng Li, Hong-Zhong Huang, Xiang-Yu Li, and Cheng-Geng Huang
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021103 operations research ,Computer science ,business.industry ,Deep learning ,Feature extraction ,Perspective (graphical) ,0211 other engineering and technologies ,02 engineering and technology ,Fault (power engineering) ,computer.software_genre ,Inspection time ,Turbofan ,Data modeling ,0202 electrical engineering, electronic engineering, information engineering ,020201 artificial intelligence & image processing ,Data mining ,Artificial intelligence ,Fixed length ,business ,computer - Abstract
In modern industry, engineered systems are generally required to work under complex operational conditions to complete specific missions. But most of existing data-driven prognostic methods still lack an effective model that can utilize operational conditions data to predict remaining useful life (RUL) of engineered systems. To fill these practical gaps, this paper develops a novel prognostic method based on Bi-Directional Long Short-Term Memory (BLSTM) network. The proposed method can effectively integrate multiple sensors data with operational conditions data for RUL prediction of engineered systems. In the proposed prognostic framework, multiple raw sensors data, operational conditions data, and inspection time epoch are preprocessed to form the desired sequences data with fixed length, and then are taken as main inputs and auxiliary inputs to fed into proposed BLSTM based network. And the labeled RUL are used as actual output for training the proposed model. Different from other deep learning (DL) based prognostic methods, the developed method can simultaneously model both sensors data and operational conditions data in a consolidated framework. The proposed approach is validated through a case study on aircraft turbofan engine, and comparisons with other existing state-of-the-art methods are also included.
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- 2019
146. Reliability Evaluation for the C4ISR Communication System via Propagation Model
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Xiang Li, Cheng-Geng Huang, Xiang-Yu Li, and Hong-Zhong Huang
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Distribution (number theory) ,Computer science ,business.industry ,Cumulative distribution function ,020302 automobile design & engineering ,020206 networking & telecommunications ,Probability density function ,02 engineering and technology ,Communications system ,Reliability engineering ,0203 mechanical engineering ,Log-normal distribution ,0202 electrical engineering, electronic engineering, information engineering ,Wireless ,Path loss ,business ,Reliability (statistics) - Abstract
The effect of path loss on the reliability of wireless communication in Military C4ISR (Command, Control, Communication, computer, Intelligence, Surveillance and Reconnaissance) Architectures has drawn much attention. Previous work were focused on the reliability assessment of infrastructure, but its link reliability has not been fully considered. This paper puts forward a new method for the reliability assessment of the C4ISR communication through the analysis of the traditional suburban Millimeter Waves (MMW) path loss models. To evaluate the effects of the path loss on the link reliability, we used the lognormal distribution to fit the random distribution curve of the communication distance. Derived by formula, the PDF (Probability Distribution Function) and the CDF (Cumulative Distribution Function) of the path loss value on different communication distance have been obtained. Finally, the C4ISR communication reliability at different frequencies are calculated based on the threshold of the path loss value. The advantage of this method is that it can reflect the effects of the environmental factors and carrier frequency on the reliability of the C4ISR wireless communication.
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- 2019
147. Synthesis and Evaluation of 3-Substituted-4-(quinoxalin-6-yl) Pyrazoles as TGF-β Type I Receptor Kinase Inhibitors
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Jun Zhe Min, Zhen Guo, Wen-Jing Zhu, Yi-Jie Xue, Li-Min Zhao, Hu-Ri Piao, Xiang-Yu Li, and Cheng Hua Jin
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0301 basic medicine ,TGF-β ,kinase assay ,Receptor, Transforming Growth Factor-beta Type I ,Pharmaceutical Science ,Article ,Analytical Chemistry ,lcsh:QD241-441 ,Structure-Activity Relationship ,03 medical and health sciences ,ALK5 inhibitor ,lcsh:Organic chemistry ,Drug Discovery ,medicine ,Enzyme Inhibitors ,Physical and Theoretical Chemistry ,IC50 ,biology ,Chemistry ,Kinase ,Organic Chemistry ,selectivity ,Molecular Docking Simulation ,030104 developmental biology ,Biochemistry ,Mechanism of action ,Chemistry (miscellaneous) ,Docking (molecular) ,Mitogen-activated protein kinase ,docking ,Quinolines ,biology.protein ,Pyrazoles ,Molecular Medicine ,Phosphorylation ,medicine.symptom ,Selectivity ,Transforming growth factor - Abstract
The transforming growth factor-&beta, (TGF-&beta, ), in which overexpression has been associated with various diseases, has become an attractive molecular target for the treatment of cancers. Thirty-two quinoxaline-derivatives of 3-substituted-4-(quinoxalin-6-yl) pyrazoles 14a&ndash, d, 15a&ndash, d, 16a&ndash, d, 17a&ndash, d, 18a&ndash, d, 19a&ndash, d, 25a, 25b, 25d, 26a, 26b, 26d, 27b, and 27d were synthesized and evaluated for their activin TGF-&beta, type I receptor kinase and p38&alpha, mitogen activated protein (MAP) kinase inhibitory activity in enzymatic assays. Among these compounds, the most active compound 19b inhibited TGF-&beta, type I receptor kinase phosphorylation with an IC50 value of 0.28 µ, M, with 98% inhibition at 10 µ, M. Compound 19b also had good selectivity index of >, 35 against p38&alpha, MAP kinase, with 9.0-fold more selective than clinical candidate, compound 3 (LY-2157299). A molecular docking study was performed to identify the mechanism of action of the synthesized compounds and their good binding interactions were observed. ADMET prediction of good active compounds showed that these ones possess good pharmacokinetics and drug-likeness behavior.
- Published
- 2018
- Full Text
- View/download PDF
148. Ensuring Organizational Justice: Cases from Chinese State-Owned Enterprises
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Xiang Yu Li and Donghong Cai
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State owned ,Organizational justice ,Business ,Public administration - Published
- 2018
149. Response to anonymous Referee #2
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Xiang-Yu Li
- Published
- 2018
150. Response to anonymous Referee #1
- Author
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Xiang-Yu Li
- Published
- 2018
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