99 results on '"Yiqi Jiang"'
Search Results
2. Compressible viscoelasticity of cell membranes determined by gigahertz-frequency acoustic vibrations
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Kuai Yu, Yiqi Jiang, Yungao Chen, Xiaoyan Hu, Junlei Chang, Gregory V. Hartland, and Guo Ping Wang
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Acoustic vibrations ,Cell membrane viscoelasticity ,Membrane fluid mechanics ,Structural relaxation time ,High-frequency biomechanics ,Au nanoplates ,Physics ,QC1-999 ,Acoustics. Sound ,QC221-246 ,Optics. Light ,QC350-467 - Abstract
Membrane viscosity is an important property of cell biology, which determines cellular function, development and disease progression. Various experimental and computational methods have been developed to investigate the mechanics of cells. However, there have been no experimental measurements of the membrane viscosity at high-frequencies in live cells. High frequency measurements are important because they can probe viscoelastic effects. Here, we investigate the membrane viscosity at gigahertz-frequencies through the damping of the acoustic vibrations of gold nanoplates. The experiments are modeled using a continuum mechanics theory which reveals that the membranes display viscoelasticity, with an estimated relaxation time of ca. 5.7+2.4/−2.7 ps. We further demonstrate that membrane viscoelasticity can be used to differentiate a cancerous cell line (the human glioblastoma cells LN-18) from a normal cell line (the mouse brain microvascular endothelial cells bEnd.3). The viscosity of cancerous cells LN-18 is lower than that of healthy cells bEnd.3 by a factor of three. The results indicate promising applications of characterizing membrane viscoelasticity at gigahertz-frequency in cell diagnosis.
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- 2023
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3. Global solvability of 3D non-isothermal incompressible nematic liquid crystal flows
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Zhongying Liu, Yang Liu, and Yiqi Jiang
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inhomogeneous case ,incompressible nematic liquid crystal flows ,global strong solution ,vacuum ,Mathematics ,QA1-939 - Abstract
We are concerned with the initial value problem of non-isothermal incompressible nematic liquid crystal flows in $ \Bbb R^3 $. Through some time-weighted a priori estimates, we prove the global existence of a strong solution provided that $ \Big(\|\sqrt{\rho_0}u_0\|_{L^2}^2+\|\nabla d_0\|_{L^2}^2\Big)\Big(\|\nabla u_0\|_{L^2}^2+\|\nabla^2d_0\|_{L^2}^2\Big) $ is reasonably small, which extends the corresponding Li's (Methods Appl. Anal. 2015 [4]) and Ding-Huang-Xia's (Filomat 2013 [2]) results to the whole space $ \Bbb R^3 $ and non-isothermal case. Furthermore, we also derive the algebraic decay estimates of the solution.
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- 2022
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4. Both simulation and sequencing data reveal coinfections with multiple SARS-CoV-2 variants in the COVID-19 pandemic
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Yinhu Li, Yiqi Jiang, Zhengtu Li, Yonghan Yu, Jiaxing Chen, Wenlong Jia, Yen Kaow Ng, Feng Ye, Shuai Cheng Li, and Bairong Shen
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SARS-CoV-2 variant coinfection ,Viral transmission simulation ,Coinfection index ,Heterozygous single-nucleotide polymorphisms ,Biotechnology ,TP248.13-248.65 - Abstract
SARS-CoV-2 is a single-stranded RNA betacoronavirus with a high mutation rate. The rapidly emerging SARS-CoV-2 variants could increase transmissibility and diminish vaccine protection. However, whether coinfection with multiple SARS-CoV-2 variants exists remains controversial. This study collected 12,986 and 4,113 SARS-CoV-2 genomes from the GISAID database on May 11, 2020 (GISAID20May11), and Apr 1, 2021 (GISAID21Apr1), respectively. With single-nucleotide variant (SNV) and network clique analyses, we constructed single-nucleotide polymorphism (SNP) coexistence networks and discovered maximal SNP cliques of sizes 16 and 34 in the GISAID20May11 and GISAID21Apr1 datasets, respectively. Simulating the transmission routes and SNV accumulations, we discovered a linear relationship between the size of the maximal clique and the number of coinfected variants. We deduced that the COVID-19 cases in GISAID20May11 and GISAID21Apr1 were coinfections with 3.20 and 3.42 variants on average, respectively. Additionally, we performed Nanopore sequencing on 42 COVID-19 patients and discovered recurrent heterozygous SNPs in twenty of the patients, including loci 8,782 and 28,144, which were crucial for SARS-CoV-2 lineage divergence. In conclusion, our findings reported SARS-CoV-2 variants coinfection in COVID-19 patients and demonstrated the increasing number of coinfected variants.
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- 2022
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5. Metagenomic analysis revealed the potential role of gut microbiome in gout
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Yongliang Chu, Silong Sun, Yufen Huang, Qiang Gao, Xuefeng Xie, Peng Wang, Junxia Li, Lifeng Liang, Xiaohong He, Yiqi Jiang, Maojie Wang, Jianhua Yang, Xiumin Chen, Chu Zhou, Yue Zhao, Fen Ding, Yi Zhang, Xiaodong Wu, Xueyuan Bai, Jiaqi Wu, Xia Wei, Xianghong Chen, Zhen Yue, Xiaodong Fang, Qingchun Huang, Zhang Wang, and Runyue Huang
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Microbial ecology ,QR100-130 - Abstract
Abstract Emerging evidence indicates an association between gut microbiome and arthritis diseases including gout. However, how and which gut bacteria affect host urate degradation and inflammation in gout remains unclear. Here we performed a metagenome analysis on 307 fecal samples from 102 gout patients and 86 healthy controls. Gout metagenomes significantly differed from those of healthy controls. The relative abundances of Prevotella, Fusobacterium, and Bacteroides were increased in gout, whereas those of Enterobacteriaceae and butyrate-producing species were decreased. Functionally, gout patients had greater abundances for genes in fructose, mannose metabolism and lipid A biosynthesis, and lower for genes in urate degradation and short chain fatty acid production. A three-pronged association between metagenomic species, functions and clinical parameters revealed that decreased abundances of species in Enterobacteriaceae were associated with reduced amino acid metabolism and environmental sensing, which together contribute to increased serum uric acid and C-reactive protein levels in gout. A random forest classifier based on three gut microbial genes showed high predictivity for gout in both discovery and validation cohorts (0.91 and 0.80 accuracy), with high specificity in the context of other chronic disorders. Longitudinal analysis showed that uric-acid-lowering and anti-inflammatory drugs partially restored gut microbiota after 24-week treatment. Comparative analysis with obesity, type 2 diabetes, ankylosing spondylitis and rheumatoid arthritis indicated that gout metagenomes were more similar to those of autoimmune than metabolic diseases. Our results suggest that gut dysbiosis was associated with dysregulated host urate degradation and systemic inflammation and may be used as non-invasive diagnostic markers for gout.
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- 2021
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6. Metagenome-wide association study of gut microbiome revealed potential microbial marker set for diagnosis of pediatric myasthenia gravis
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Peng Liu, Yiqi Jiang, Shanshan Gu, Yinping Xue, Hongxia Yang, Yongzhao Li, Yaxuan Wang, Congya Yan, Pei Jia, Xiaoting Lin, and Guoyan Qi
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Myasthenia gravis ,Metagenomics ,SCFAs ,Adenovirus ,Microbial marker ,Medicine - Abstract
Abstract Background Myasthenia gravis (MG) is an acquired immune-mediated disorder of the neuromuscular junction that causes fluctuating skeletal muscle weakness and fatigue. Pediatric MG and adult MG have many different characteristics, and current MG diagnostic methods for children are not quite fit. Previous studies indicate that alterations in the gut microbiota may be associated with adult MG. However, it has not been determined whether the gut microbiota are altered in pediatric MG patients. Methods Our study recruited 53 pediatric MG patients and 46 age- and gender-matched healthy controls (HC). We sequenced the fecal samples of recruited individuals using whole-genome shotgun sequencing and analyzed the data with in-house bioinformatics pipeline. Results We built an MG disease classifier based on the abundance of five species, Fusobacterium mortiferum, Prevotella stercorea, Prevotella copri, Megamonas funiformis, and Megamonas hypermegale. The classifier obtained 94% area under the curve (AUC) in cross-validation and 84% AUC in the independent validation cohort. Gut microbiome analysis revealed the presence of human adenovirus F/D in 10 MG patients. Significantly different pathways and gene families between MG patients and HC belonged to P. copri, Clostridium bartlettii, and Bacteroides massiliensis. Based on functional annotation, we found that the gut microbiome affects the production of short-chain fatty acids (SCFAs), and we confirmed the decrease in SCFA levels in pediatric MG patients via serum tests. Conclusions The study indicated that altered fecal microbiota might play vital roles in pediatric MG’s pathogenesis by reducing SCFAs. The microbial markers might serve as novel diagnostic methods for pediatric MG.
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- 2021
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7. Conical Grinding Wheel Ultrasonic-Assisted Grinding Micro-Texture Surface Formation Mechanism
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Jiaying Han, Yiqi Jiang, Xinrui Li, and Qing Li
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rotary ultrasonic assisted grinding ,conical grinding wheel ,grinding depth ,micro-texture ,simulation method ,Mechanical engineering and machinery ,TJ1-1570 - Abstract
The rotating ultrasonic-assisted grinding (RUAG) experiment of the conical grinding wheel generated the intermittent pit-shaped micro-texture on the surface of the workpiece, reducing thermal damage and improving the lubrication characteristics compared with conventional grinding (CG). To further optimize the surface properties, this paper studied the formation mechanism of micro-texture. This study used as basis the theory that micro-debris volume equals the macroscopic material removal one to establish the mathematical equation of grinding depth. Thereafter, formulas of micro-texture feature parameters, including pit length, pit depth, and texture spacing were deduced. The solved microscopic grinding depth was alternatingly positive and negative, indicating that the alternating separation between the grinding grain and workpiece caused intermittent pits in the grinding. Through response surface analysis (RSA), this paper analyzed the relationships among macroscopic grinding depth, micro-texture feature parameters, and machining parameters (i.e., amplitude, feed rate, and rotational speed). Single-factor experiments of machining parameters, with finite element simulation and experiment methods, were performed to verify the theoretical micro-texture features. The simulated program formed three-dimensional surfaces with micro-textures. Their measurement results were consistent with the theoretical ones. Experimental results proved that the range of pit length covers the theoretical ones, further verifying the accuracy of the grinding depth model. For this grinding wheel, the 8–10 μm amplitude was optimal for better roughness, lubrication, and thermal damage. Roughness was improved when increasing the rotational speed or reducing the feed rate based on the experiment. If the rotational speed and feed rate exceed the limiting values, then continuous grinding will break down the abrasive grains and even damage the cubic boron nitride (CBN) coating. Experimental results likewise showed that the pit shape was closely related to the surface properties, which deserves further investigation.
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- 2023
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8. LEMON: a method to construct the local strains at horizontal gene transfer sites in gut metagenomics
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Chen Li, Yiqi Jiang, and Shuaicheng Li
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HGT ,Local strain ,Gut metagenomics ,Graph ,Computer applications to medicine. Medical informatics ,R858-859.7 ,Biology (General) ,QH301-705.5 - Abstract
Abstract Background Horizontal Gene Transfer (HGT) refers to the transfer of genetic materials between organisms through mechanisms other than parent-offspring inheritance. HGTs may affect human health through a large number of microorganisms, especially the gut microbiomes which the human body harbors. The transferred segments may lead to complicated local genome structural variations. Details of the local genome structure can elucidate the effects of the HGTs. Results In this work, we propose a graph-based method to reconstruct the local strains from the gut metagenomics data at the HGT sites. The method is implemented in a package named LEMON. The simulated results indicate that the method can identify transferred segments accurately on reference sequences of the microbiome. Simulation results illustrate that LEMON could recover local strains with complicated structure variation. Furthermore, the gene fusion points detected in real data near HGT breakpoints validate the accuracy of LEMON. Some strains reconstructed by LEMON have a replication time profile with lower standard error, which demonstrates HGT events recovered by LEMON is reliable. Conclusions Through LEMON we could reconstruct the sequence structure of bacteria, which harbors HGT events. This helps us to study gene flow among different microbial species.
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- 2019
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9. Correction to: Integrated analysis of microRNA regulatory network in nasopharyngeal carcinoma with deep sequencing
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Fan Wang, Juan Lu, Xiaohong Peng, Jie Wang, Xiong Liu, Xiaomei Chen, Yiqi Jiang, Xiangping Li, and Bao Zhang
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Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Published
- 2022
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10. Aqueous Extract of Phyllanthus emblica L. Alleviates Functional Dyspepsia through Regulating Gastrointestinal Hormones and Gut Microbiome In Vivo
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Xiaoqing Li, Yilin Lin, Yiqi Jiang, Binbin Wu, and Yigang Yu
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aqueous Phyllanthus emblica L. extract ,functional dyspepsia ,gastrointestinal hormones ,gut microbiome ,Chemical technology ,TP1-1185 - Abstract
Phyllanthus emblica L. fruits were extracted by a hot water assistant with ultrasonication to obtain aqueous Phyllanthus emblica L. extract (APE). The ameliorating functional dyspepsia (FD) effect of a low dose (150 mg/kg) and a high dose (300 mg/kg) of APE was exhibited by determining the gastrointestinal motility, gastrointestinal hormones, and gut microbiome shifts in reserpine induced FD male balb/c mice. APE increased the gastrointestinal motility including the gastric emptying (GE) rate and small intestinal transit (SIT) rate. The level of serum gastrointestinal hormones such as motilin (MTL) and gastrin (GAS) increased, and the vasoactive intestinal peptide (VIP) level decreased after the administration of APE. Furthermore, the gut microbiome analysis demonstrated that APE could regulate the microbiome structure and restore homeostasis by elevating useful bacterial abundance, while simultaneously decreasing harmful bacterial abundance. This study demonstrated the ameliorating FD effect of APE and its potential efficacy in curing functional gastrointestinal disorders and maintaining a healthy digestive tract.
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- 2022
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11. Cultivation of lipid-producing microalgae in struvite-precipitated liquid digestate for biodiesel production
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Yiqi Jiang, Xiaodong Pu, Dan Zheng, Tao Zhu, Shuang Wang, Liangwei Deng, and Wenguo Wang
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Liquid digestate ,Struvite precipitation ,Microalgae ,Dictyosphaerium ehrenbergianum ,Biodiesel ,Fuel ,TP315-360 ,Biotechnology ,TP248.13-248.65 - Abstract
Abstract Background Using liquid digestate from the biogas industry as a medium to culture lipid-producing microalgae is considered mutually beneficial for digestate valorization and for reducing the cost of microalgal cultivation. However, the low transmittance and high ammonium (NH4 +-N) levels in liquid digestate negatively influence microalgae growth. Results Struvite precipitation was used to pretreat liquid digestate. To obtain struvite-precipitated supernatant with an ideal transmittance, NH4 +-N concentration, salinity, and N:P ratio for microalgal growth, there should be a 1:1.2:1.2 NH4 +:Mg2+:PO4 3− molar ratio in the liquid digestate, with KH2PO4 and MgCl2 added through continuous stirring. The addition and stirring was subsequently stopped when the pH reached 8.5. Of the nine tested microalgae species, Dictyosphaerium ehrenbergianum exhibited the best growth in the supernatant. The biomass productivity and lipid content of D. ehrenbergianum cultured in the struvite-precipitated supernatant were 161.06 mg/l/days and 34.33%, respectively, which was higher than when cultured in the standard BG-11 medium. Moreover, the struvite-precipitated supernatant improved the accumulation of monounsaturated fatty acids and saturated fatty acids. Conclusions This study described a new way to combine liquid digestate treatment and microalgal biodiesel production. The struvite-pretreated liquid digestate can be used to culture D. ehrenbergianum for biodiesel production.
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- 2018
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12. Deconfounding Causal Inference for Zero-Shot Action Recognition.
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Junyan Wang, Yiqi Jiang, Yang Long 0001, Xiuyu Sun, Maurice Pagnucco, and Yang Song 0001
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- 2024
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13. Point Label Meets Remote Sensing Change Detection: A Consistency-Aligned Regional Growth Network.
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Leyuan Fang, Yiqi Jiang, Hongfeng Yu, Yingying Zhang, and Jun Yue
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- 2024
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14. Conformal Prediction for Uncertainty-Aware Planning with Diffusion Dynamics Model.
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Jiankai Sun, Yiqi Jiang, Jianing Qiu, Parth Nobel, Mykel J. Kochenderfer, and Mac Schwager
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- 2023
15. An Empirical Study of Vehicle Re-Identification on the AI City Challenge.
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Hao Luo 0004, Weihua Chen, Xianzhe Xu, Jianyang Gu, Yuqi Zhang, Chong Liu 0002, Yiqi Jiang, Shuting He, Fan Wang 0019, and Hao Li 0030
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- 2021
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16. Exploring the Quality of GAN Generated Images for Person Re-Identification.
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Yiqi Jiang, Weihua Chen, Xiuyu Sun, Xiaoyu Shi, Fan Wang 0019, and Hao Li 0030
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- 2021
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17. GiraffeDet: A Heavy-Neck Paradigm for Object Detection.
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Yiqi Jiang, Zhiyu Tan, Junyan Wang, Xiuyu Sun, Ming C. Lin, and Hao Li 0030
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- 2022
18. PStrain: an iterative microbial strains profiling algorithm for shotgun metagenomic sequencing data.
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Shuai Wang, Yiqi Jiang, and Shuai Cheng Li 0001
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- 2021
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19. DAMO-YOLO : A Report on Real-Time Object Detection Design.
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Xianzhe Xu, Yiqi Jiang, Weihua Chen, Yilun Huang 0004, Yuan Zhang, and Xiuyu Sun
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- 2022
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20. Dextran-Sulfate-Sodium-Induced Colitis-Ameliorating Effect of Aqueous Phyllanthus emblica L. Extract through Regulating Colonic Cell Gene Expression and Gut Microbiomes
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Xiaoqing Li, Wen Ouyang, Yiqi Jiang, Qianru Lin, Xinan Peng, Hao Hu, Zhuming Ye, Guo Liu, Yong Cao, and Yigang Yu
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General Chemistry ,General Agricultural and Biological Sciences - Published
- 2023
21. 1st Place Solution to VisDA-2020: Bias Elimination for Domain Adaptive Pedestrian Re-identification.
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Jianyang Gu, Hao Luo 0004, Weihua Chen, Yiqi Jiang, Yuqi Zhang, Shuting He, Fan Wang 0019, Hao Li 0030, and Wei Jiang 0009
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- 2020
22. KDiamend: a package for detecting key drivers in a molecular ecological network of disease.
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Mengxuan Lyu, Jiaxing Chen, Yiqi Jiang, Wei Dong, Zhou Fang, and Shuai Cheng Li 0001
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- 2018
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23. Why do employees (not) share innovative knowledge, and how does this sharing influence career interest?
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Yiqi Jiang
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Management of Technology and Innovation ,Library and Information Sciences ,Business and International Management ,Management Information Systems - Published
- 2022
24. Research Progress in Pharmacological Action of Dehydroevodiamine
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Jiangfa, Li, primary, Hao, Peng, additional, Yiqi, Jiang, additional, and Wenxiang, Song, additional
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- 2023
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25. Video Inpainting Based on Joint Gradient and Noise Minimization.
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Yiqi Jiang, Xin Jin 0002, and Zhiyong Wu 0001
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- 2016
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26. Highly Efficient Biosynthesis of Salidroside by a UDP-glucosyltransferase-catalyzed Cascade Reaction
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Guosi Li, Qilin Xu, Nan Hu, Xinyang Liu, Yiqi Jiang, Hailong Xue, Yongjun Zang, and Fucheng Zhu
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Objective Salidroside is an important plant-derived aromatic compound with diverse biological properties. The main objective of this study was to synthesize salidroside from tyrosol using UDP-glucosyltransferase (UGT) with in situ regeneration of UDP-glucose (UDPG). Results The UDP-glucosyltransferase 85A1 (UGT85A1) from Arabidopsis thaliana,which showed high activity and regioselectivity towards tyrosol, was selected for the production of salidroside. Then, an in vitro cascade reaction for in situ regeneration of UDPG was constructed by coupling UGT85A1 to sucrose synthase from Glycine max (GmSuSy). The optimal UGT85A1-GmSuSy activity ratio of 1:2 was determined to balance the efficiency of salidroside production and UDP-glucose regeneration. Different cascade reaction conditions for salidroside production were also determined. Under the optimized condition, salidroside was produced at a titer of 6.0 g/L with a corresponding molar conversion of 99.6% and a specific productivity of 199.1 mg/L/h in a continuous feeding reactor. Conclusion This is the highest salidroside titer ever reported so far using biocatalytic approach.
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- 2023
27. Modified t-Distribution Evolutionary Algorithm for Dynamic Deployment of Wireless Sensor Networks.
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Xiaolei Liu 0001, Xiaosong Zhang 0001, Yiqi Jiang, and Qingxin Zhu
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- 2016
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28. Energy Dissipation for Nanometer Sized Acoustic Oscillators
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Kuai Yu, Yiqi Jiang, Cameron Wright, and Gregory V. Hartland
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General Energy ,Physical and Theoretical Chemistry ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials - Published
- 2022
29. Learning Goal Orientation, Career Self‐Efficacy, and Career Interest: A Moderated Mediation Model
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Yiqi Jiang
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Self-efficacy ,Organizational Behavior and Human Resource Management ,Moderated mediation ,Goal orientation ,Psychology ,Social psychology ,General Psychology ,Applied Psychology - Published
- 2021
30. Observation of elastic heterogeneity and phase evolution in 2D layered perovskites using coherent acoustic phonons
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Junzhong Wang, Jiaqi Zhu, Kuai Yu, Yiqi Jiang, Guo Ping Wang, and Mengying Li
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Materials science ,Condensed matter physics ,Phonon ,Physics ,QC1-999 ,elastic heterogeneity ,time-domain brillouin spectroscopy ,Acoustic Phonons ,Phase evolution ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Condensed Matter::Materials Science ,Condensed Matter::Superconductivity ,Condensed Matter::Strongly Correlated Electrons ,Electrical and Electronic Engineering ,acoustic phonon ,perovskite ,Biotechnology ,Perovskite (structure) - Abstract
Two-dimensional (2D) organic–inorganic perovskites have shown interesting optical properties due to the natural quantum-well structures. The repetition of soft organic and hard inorganic intercalations also renders 2D perovskites rich phonon dynamics. Here, we investigated the coherent acoustic phonons in (PEA)2PbI4 perovskite films by time-resolved Brillouin spectroscopy. The coherent acoustic phonons were launched indirectly in perovskite films by exciting Au nanoplates which were used as optoacoustic transducers. A longitudinal sound velocity ν = 1937 ± 31 m/s, and an elastic modulus E = 9.84 GPa along the cross-plane direction of perovskites were obtained from analysis of the Brillouin oscillation frequency. Following a bead-spring model, we calculated a spring constant k ≈ 1.709 N m−1 for PEA cations which is comparably small for perovskites. We also demonstrated that coherent acoustic phonons are sensitive to differentiate structural heterogeneity and monitor dynamic phase evolution in perovskite films. Domains of PbI2-rich and PbI2-poor phases were identified. Under light stimulus, PbI2-poor phases were gradually disappearing and PbI2-rich phases became crystallized. The observations of structural and elastic heterogeneity and dynamic phase evolution using coherent acoustic phonons provide a toolbox for submicroscale elastic characterization of perovskites.
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- 2021
31. GutMeta: online microbiome analysis and interactive visualization with build-in curated human gut microbiome database
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Yiqi Jiang, Yanfei Wang, Lijia Che, Qian Zhou, and Shuaicheng Li
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BackgroundThe human gut microbiome is associated with numerous human diseases. The whole-genome shotgun metagenomics sequencing helps accumulate a massive amount of gut microbiome data. However, few curated integrated platforms are available to explore the vast dataset. Advances in data generation pose new challenges to researchers attempting to analyze, visualize, and reuse published data.ResultGutMeta (human GUT whole-genome shotgun METAgenomics data analysis platform) is a one-stop online human gut metagenomic research platform that integrates a curated database, analyses, and visualizations.First, we built the Human Gut Metagenomics Database (HGMD), which contained taxonomy profiling and metadata of the metagenomics. HGMD collected the published human gut microbiome samples with whole metagenome shotgun (WMGS) sequencing data and consistently performed taxonomy classification using MetaPhlan3 for each sample. The various related metadata information was curated, and phenotypes were according to the MeSH ID. At this moment, HGMD contains 20,898 samples from 91 projects related to 65 diseases. Embedded tools could help users to explore the samples by keywords. Second, GutMeta provides researchers with user-friendly metagenomics analysis modules, including community diversity calculation, differential testing, dimension reduction, disease classifier construction, etc. Then, GutMeta provides corresponding interactive visualizations which can download as Scalable Vector Graphics (SVG), providing high-quality images. Further, GutMeta supplies two additional visualizations for the multi-level taxonomy overview for advanced investigations. GutMeta also supports online editing, including attribute adjustment, recoloring, reordering, and drag-and-drop. Third, GutMeta supports users in building their metagenomics analysis workspaces, including standard profiles uploading and built-in HGMD data import for online customized analyses and visualization.ConclusionGutMeta offers a solution to improve reproducibility in metagenomic research, with the standardized procedure from input data to downstream analysis and visualization. GutMeta is a free access analysis platform that integrates human gut WMGS sequencing data, nine online bioinformatics analysis and data visualization modules/pipelines, and a customized workspace. GutMeta is avaiable at https://GutMeta.deepomics.org.
- Published
- 2022
32. Digital surface morphology modeling of rotary ultrasonic auxiliary grinding spiral bevel gear
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Xinrui Li, Jiaying Han, Yiqi Jiang, and Yongli Shen
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History ,Computer Science Applications ,Education - Abstract
Because the tooth surface micromorphology affects the performance of the gear and the finite element analysis and the grinding process of tooth surface through finite element analysis and simulation is complicated and time-consuming, the paper proposed a three-dimensional (3D) ultrasonic assistant grinding (RUAG) geometric simulation method to discover the micromorphology formation mechanism. Based on the motion path of a single grain, the 3D models of gear blank and the grinder was built. It helps to simulate the RUAG process. The morphologies of the simulated tooth surface were compared under conventional grinding (CG) and RUAG, which was consistent with the practice. It is proved that the geometric simulation method intuitively shows the micro dents on the tooth surface under different grinding parameters. The simulation method is helpful to analyze the surface morphology under different RUAG machining parameters and saves the cost and time of the actual production and processing.
- Published
- 2023
33. A framework to trace microbial engraftment at the strain level during fecal microbiota transplantation
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Yiqi Jiang, Shuai Wang, Yanfei Wang, Xianglilan Zhang, and Shuaicheng Li
- Abstract
BackgroundFecal microbiota transplantation (FMT) may treat microbiome-associated diseases effectively. However, the mechanism and pattern of the FMT process require expositions. Previous studies indicated the necessity to track the FMT process at the microbial strain level. At this moment, shotgun metagenomic sequencing enables us to study strain variations during the FMT.ResultWe implemented a software package PStrain-tracer to study microbial strain variations during FMT from the shotgun metagenomic sequencing data. The package visualizes the strain alteration and traces the microbial engraftment during the FMT process. We applied the package to two typical FMT datasets: one ulcerative colitis (UC) dataset and one Clostridium difficile infection (CDI) dataset. We observed that when the engrafted species has more than one strain in the source sample, 99.3% of the engrafted species will engraft only a subset of strains. We further confirmed that the all-or-nothing manner unsuited the engraftment of species with multiple strains by heterozygous single-nucleotide polymorphisms (SNPs) count, revealing that strains prefer to engraft independently. Furthermore, we discovered a primary determinant of strain engrafted success is their proportion in species, as the engrafted strains from the donor and the pre-FMT recipient with proportions 33.10 % (p-value = 6e − 06) and 37.08 % (p-value = 9e − 05) significantly higher than ungrafted strains on average, respectively. All the datasets indicated that the diversity of strains bursts after FMT and decreases to one after eight weeks for twelve species. Previous studies neglected strains with their corresponding species showing insignificant differences between different samples. With the package, from the UC dataset, we successfully determined the strain variations of the species Roseburia intestinalis, a beneficial species reducing intestinal inflammation, colonized in the cured UC patient being engrafted from the donor, even if the patient hosted the same species yet before treatment. We found seven strains in donors from the CDI dataset and one strain in pre-FMT recipients from eight species that associated CDI FMT failure.ConclusionPStrain-tracer is the first framework that tracks strain alterations in metagenomic sequencing data of FMT. PStrain-tracer implemented several methods specialized for FMT experiment samples, such as visualization of strains abundance alteration in the FMT experiment and determinant strains detection in FMT failure. We applied PStrain-tracer on two published datasets, uncovered novel strains related to FMT failure, and demonstrated the necessity of analyzing the whole-genome shotgun metagenomic data of FMT at the strain level. We also developed an online visualizer of PStrain-tracer for the users to adjust their visualized results online. The package is available at https://github.com/deepomicslab/PStrain-tracer.
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- 2022
34. A hybrid model combining mode decomposition and deep learning algorithms for detecting TP in urban sewer networks
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Yituo Zhang, Chaolin Li, Yiqi Jiang, Ruobin Zhao, Kefen Yan, and Wenhui Wang
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General Energy ,Mechanical Engineering ,Building and Construction ,Management, Monitoring, Policy and Law - Published
- 2023
35. PStrain: an iterative microbial strains profiling algorithm for shotgun metagenomic sequencing data
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Yiqi Jiang, Shuai Wang, and Shuai Cheng Li
- Subjects
Statistics and Probability ,0303 health sciences ,Sequencing data ,Locus (genetics) ,Shotgun ,Computational biology ,Biology ,Biochemistry ,Genome ,Computer Science Applications ,Genotype frequency ,03 medical and health sciences ,Computational Mathematics ,0302 clinical medicine ,Computational Theory and Mathematics ,Metagenomics ,Genotype ,Molecular Biology ,Gene ,030217 neurology & neurosurgery ,030304 developmental biology - Abstract
Motivation The microbial community plays an essential role in human diseases and physiological activities. The functions of microbes can differ due to strain-level differences in the genome sequences. Shotgun metagenomic sequencing allows us to profile the strains in microbial communities practically. However, current methods are underdeveloped due to the highly similar sequences among strains. We observe that strains genotypes at the same single nucleotide variant (SNV) locus can be speculated by the genotype frequencies. Also, the variants in different loci covered by the same reads can provide evidence that they reside on the same strain. Results These insights inspire us to design PStrain, an optimization method that utilizes genotype frequencies and the reads which cover multiple SNV loci to profile strains iteratively based on SNVs in a set of MetaPhlAn2 marker genes. Compared to the state-of-art methods, PStrain, on average, improved the performance of inferring strains abundances and genotypes by 87.75% and 59.45%, respectively. We have applied the PStrain package to the dataset with two cohorts of colorectal cancer (CRC) and found that the sequences of Bacteroides coprocola strains are significantly different between CRC and control samples, which is the first time to report the potential role of B.coprocola in the gut microbiota of CRC. Availabilityand implementation https://github.com/wshuai294/PStrain. Supplementary information Supplementary data are available at Bioinformatics online.
- Published
- 2020
36. Aqueous Extract of
- Author
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Xiaoqing, Li, Yilin, Lin, Yiqi, Jiang, Binbin, Wu, and Yigang, Yu
- Published
- 2022
37. The Value of the PCAOB’s International Audit Oversight on U.S. listed Foreign Companies: Evidence from an Initial Enforcement Breakdown
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Tracy Gu, Yiqi Jiang, and Dan Simunic
- Subjects
History ,Polymers and Plastics ,Accounting ,Business and International Management ,Industrial and Manufacturing Engineering - Published
- 2022
38. Deep Learning Model Based on Urban Multi-Source Data for Predicting Heavy Metals (Cu, Zn, Ni, Cr) in Industrial Sewer Networks
- Author
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Yiqi Jiang, Chaolin Li, Hongxing Song, and Wenhui Wang
- Subjects
China ,Zinc ,Environmental Engineering ,Deep Learning ,Sewage ,Health, Toxicology and Mutagenesis ,Metals, Heavy ,Environmental Chemistry ,Pollution ,Waste Management and Disposal ,Environmental Monitoring ,Water Purification - Abstract
The high concentrations of heavy metals in municipal industrial sewer networks will seriously impact the microorganisms of the activated sludge in the wastewater treatment plant (WWTP), thus deteriorating the effluent quality and destroying the stability of sewage treatment. Therefore, timely prediction and early warning of heavy metal concentrations in industrial sewer networks is crucial. However, due to the complex sources of heavy metals in industrial sewer networks, traditional physical modeling and linear methods cannot establish an accurate prediction model. Herein, we developed a Gated Recurrent Unit (GRU) neural network model based on a deep learning algorithm for predicting the concentrations of heavy metals in industrial sewer networks. To train the GRU model, we used low-cost and easy-to-obtain urban multi-source data, including socio-environmental indicator data, air environmental indicator data, water quantity indicator data, and easily measurable water quality indicator data. The model was applied to predict the concentrations of heavy metals (Cu, Zn, Ni, and Cr) in the sewer networks of an industrial area in southern China. The results are compared with the commonly used Artificial Neural Network (ANN) model. In this study, it was shown that the GRU had better prediction performance for Cu, Zn, Ni, and Cr concentrations, with the average R
- Published
- 2022
39. Enzymatic preparation of pyruvate by a whole-cell biocatalyst coexpressing l-lactate oxidase and catalase
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Hai-Long Xue, Guo-Si Li, Mianbin Wu, Jianping Lin, Lirong Yang, Yiqi Jiang, and Jiazhang Lian
- Subjects
0106 biological sciences ,chemistry.chemical_classification ,0303 health sciences ,Oxidase test ,biology ,Substrate (chemistry) ,Bioengineering ,Oxidative phosphorylation ,medicine.disease_cause ,01 natural sciences ,Applied Microbiology and Biotechnology ,Biochemistry ,03 medical and health sciences ,Transformation (genetics) ,Enzyme ,chemistry ,Catalase ,010608 biotechnology ,Yield (chemistry) ,biology.protein ,medicine ,Escherichia coli ,030304 developmental biology - Abstract
Enzymatic oxidative dehydrogenation of biomass-derived l -lactate in the presence of O2 is regarded as a green alternative for pyruvate production, but the process also results in H2O2 accumulation. To remove the effect of H2O2 on pyruvate production, various potential catalases from different species were screened for their efficiency in H2O2 degradation. Then, an in vitro cascade biocatalysis was designed using lactate oxidase from Aerococcus viridans (AvLOX) and catalase from Ureibacillus thermosphaericus (UtCAT). The in situ removal of H2O2 by UtCAT significantly improved the yield and productivity of pyruvate. To simplify the technological processes and reduce production costs, a whole cell biocatalyst without the addition of catalase for the production of pyruvate was established by coexpressing AvLOX and UtCAT in Escherichia coli. By applying suitable coexpression strategies and changing the ribosome binding site (RBS) strengths, the optimal ratio of AvLOX:UtCAT(12.6:4127.3) in E. coli-AvLOX-(rbs3)UtCAT was finally achieved. Under the optimized transformation conditions, pyruvate was produced at a titer of 59.9 g/L and a yield of 90.8% in a substrate fed-batch process, promising an alternative route for the green production of pyruvate.
- Published
- 2020
40. Cognitive Process Differences Between Moral Beauty Judgments and Moral Goodness Judgments
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Yiqi Jiang, Yanhui Xiang, Xue Wen, Jiaxu Zhao, and Wenrui Zhang
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010504 meteorology & atmospheric sciences ,General Neuroscience ,media_common.quotation_subject ,Face (sociological concept) ,Experimental and Cognitive Psychology ,Cognition ,moral beauty ,perceived images ,moral goodness ,010501 environmental sciences ,Aesthetic perception ,01 natural sciences ,Psychiatry and Mental health ,Clinical Psychology ,Beauty ,Psychology (miscellaneous) ,Psychology ,Research Articles ,Applied Psychology ,0105 earth and related environmental sciences ,Cognitive psychology ,media_common - Abstract
Goodness and beauty have always been important topics of debate in the field of philosophy and aesthetics. The present study used behavior and event-related potentials (ERPs) to investigate whether moral beauty judgments and moral goodness judgments involve different cognitive processes or the same cognitive process under different language labels for the same human act. Behavioral results showed that individuals gave significantly higher scores for a beautiful face than an ugly face when making moral beauty judgments, but there were no significant differences between the two conditions when making moral goodness judgments. The ERP experiment displayed larger P2 amplitudes and the late positive potential (LPP) amplitude was elicited when displaying beautiful faces but not ugly faces during moral beauty judgments. However, during moral goodness judgments, the P2 and LPP showed no significant differences under the two conditions. In general, we conclude that moral beauty judgments and moral goodness judgments involve different cognitive processes, although they objectively refer to the same human act. One of the most important differences between moral beauty judgments and moral goodness judgments was that the former process involved an image, whereas the latter did not. The present conclusion provides important insights into the research in aesthetic perception and moral sense.
- Published
- 2020
41. Thriving and career outcomes: The roles of achievement orientation and resilience
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Zhou Jiang, Ingrid Nielsen, and Yiqi Jiang
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Organizational Behavior and Human Resource Management ,Career commitment ,Achievement Orientation ,Thriving ,Psychology ,Resilience (network) ,Career satisfaction ,Social psychology - Published
- 2020
42. Biocascade Synthesis of L-Tyrosine Derivatives by Coupling a Thermophilic Tyrosine Phenol-Lyase and L-Lactate Oxidase
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Jianping Lin, Mianbin Wu, Jiazhang Lian, Yiqi Jiang, Guo-Si Li, Shuyun Ju, Lirong Yang, and Hai-Long Xue
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L lactate ,Coupling (electronics) ,Oxidase test ,Biocatalysis ,Chemistry ,Stereochemistry ,Thermophile ,Organic Chemistry ,Tyrosine phenol-lyase ,Physical and Theoretical Chemistry ,Tyrosine ,Enzyme catalysis - Published
- 2020
43. LEMON: a method to construct the local strains at horizontal gene transfer sites in gut metagenomics
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Yiqi Jiang, Shuai Cheng Li, and Chen Li
- Subjects
Gene Transfer, Horizontal ,Computational biology ,Biology ,Gut metagenomics ,lcsh:Computer applications to medicine. Medical informatics ,Biochemistry ,Genome ,Graph ,Gene flow ,03 medical and health sciences ,Structural Biology ,Databases, Genetic ,Humans ,Computer Simulation ,Microbiome ,Local strain ,Molecular Biology ,lcsh:QH301-705.5 ,030304 developmental biology ,Time profile ,0303 health sciences ,Bacteria ,030306 microbiology ,Research ,Applied Mathematics ,Inheritance (genetic algorithm) ,HGT ,Computer Science Applications ,Gastrointestinal Tract ,lcsh:Biology (General) ,Metagenomics ,Horizontal gene transfer ,lcsh:R858-859.7 ,Gene Fusion ,DNA microarray ,Transcriptome ,Software - Abstract
Background Horizontal Gene Transfer (HGT) refers to the transfer of genetic materials between organisms through mechanisms other than parent-offspring inheritance. HGTs may affect human health through a large number of microorganisms, especially the gut microbiomes which the human body harbors. The transferred segments may lead to complicated local genome structural variations. Details of the local genome structure can elucidate the effects of the HGTs. Results In this work, we propose a graph-based method to reconstruct the local strains from the gut metagenomics data at the HGT sites. The method is implemented in a package named LEMON. The simulated results indicate that the method can identify transferred segments accurately on reference sequences of the microbiome. Simulation results illustrate that LEMON could recover local strains with complicated structure variation. Furthermore, the gene fusion points detected in real data near HGT breakpoints validate the accuracy of LEMON. Some strains reconstructed by LEMON have a replication time profile with lower standard error, which demonstrates HGT events recovered by LEMON is reliable. Conclusions Through LEMON we could reconstruct the sequence structure of bacteria, which harbors HGT events. This helps us to study gene flow among different microbial species.
- Published
- 2019
44. Both Simulation and Sequencing Data Reveal Multiple SARS-CoV-2 Variants Coinfection in COVID-19 Pandemic
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Jiaxing Chen, Yonghan Yu, Feng Ye, Yinhu Li, Wenlong Jia, Shuai Cheng Li, Yiqi Jiang, Bairong Shen, Yen Kaow Ng, and Zhengtu Li
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Genetics ,Mutation rate ,viruses ,Biology ,medicine.disease ,biology.organism_classification ,Virus ,Polymorphism (computer science) ,Mutation (genetic algorithm) ,Coinfection ,medicine ,SNP ,Viral shedding ,Betacoronavirus - Abstract
SARS-CoV-2 is a single-stranded RNA betacoronavirus with a high mutation rate. The rapidly emerged SARS-CoV-2 variants could increase the transmissibility, aggravate the severity, and even fade the vaccine protection. Although the coinfections of SARS-CoV-2 with other respiratory pathogens have been reported, whether multiple SARS-CoV-2 variants coinfection exists remains controversial. This study collected 12,986 and 4,113 SARS-CoV-2 genomes from the GISAID database on May 11, 2020 (GISAID20May11) and April 1, 2021 (GISAID21Apr1), respectively. With the single-nucleotide variants (SNV) and network clique analysis, we constructed the single-nucleotide polymorphism (SNP) coexistence networks and noted the SNP number of the maximal clique as the coinfection index. The coinfection indices of GISAID20May11 and GISAID21Apr1 datasets were 16 and 34, respectively. Simulating the transmission routes and the mutation accumulations, we discovered the linear relationship between the coinfection index and the coinfected variant number. Based on the linear relationship, we deduced that the COVID-19 cases in the GISAID20May11 and GISAID21Apr1 datasets were coinfected with 2.20 and 3.42 SARS-CoV-2 variants on average. Additionally, we performed Nanopore sequencing on 42 COVID-19 patients to explore the virus mutational characteristics. We found the heterozygous SNPs in 41 COVID-19 cases, which support the coinfection of SARS-CoV-2 variants and challenge the accuracy of phylogenetic analysis. In conclusion, our findings reported the coinfection of SARS-CoV-2 variants in COVID-19 patients, demonstrated the increased coinfected variants number in the epidemic, and provided clues for the prolonged viral shedding and severe symptoms in some cases.
- Published
- 2021
45. Data-driven method based on deep learning algorithm for detecting fat, oil, and grease (FOG) of sewer networks in urban commercial areas
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Chaolin Li, Yiqi Jiang, Wenhui Wang, Yituo Zhang, Kefen Yan, and Ruobin Zhao
- Subjects
Environmental Engineering ,Flow (psychology) ,Population ,Oil and grease ,Water supply ,Data-driven ,Fats ,Deep Learning ,Relative humidity ,education ,Waste Management and Disposal ,Water Science and Technology ,Civil and Structural Engineering ,education.field_of_study ,Mathematical model ,Sewage ,business.industry ,Ecological Modeling ,Deep learning ,Temperature ,Pollution ,Hydrocarbons ,Environmental science ,Artificial intelligence ,business ,Algorithm - Abstract
The content of fat, oil and grease (FOG) in the sewer network sediments is the key indicator for diagnosing sewer blockage and overflow. However, the traditional FOG detection is time-consuming and costly, and the establishment of mathematical models based on statistical methods to predict the content of FOG fail to provide satisfactory accuracy. Herein, a deep learning algorithm used a data-driven FOG content prediction model is proposed to achieve a more accurate prediction of FOG content. Meanwhile, global sensitivity analysis (GSA) is exploited to evaluate the contribution of input indicators to the output indicator (FOG) in the model, so that some input indicators that have less impact on the prediction performance can be screened out, the best combination of input indicators can be determined, and the operation cost of the model can be reduced. To evaluate the effectiveness of the proposed model, a case study was conducted in a city in southern China. The experimental results indicate that the prediction model obtains good FOG estimations and performs well from a single site to multiple sites with a mean R2 of 0.922, showing a good generalization performance. Through GSA, the key input indicators in the model were identified as pH, water temperature (T), relative humidity (RH), sewage flow (Flow), drinking water supply (DWS), velocity (V) and conductivity (σ), and the input indicators such as air pressure (AP), population (Pop.), and liquid level (LV) can be reduced without affecting the prediction accuracy of the model.
- Published
- 2021
46. Metagenome-wide association study of gut microbiome revealed potential microbial marker set for diagnosis of pediatric myasthenia gravis
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Pei Jia, Congya Yan, Yongzhao Li, Shanshan Gu, Xiaoting Lin, Yinping Xue, Yiqi Jiang, Guoyan Qi, Yaxuan Wang, Hongxia Yang, and Peng Liu
- Subjects
Adult ,SCFAs ,0301 basic medicine ,Prevotella ,Firmicutes ,Microbial marker ,Physiology ,Gut flora ,Pathogenesis ,Feces ,03 medical and health sciences ,0302 clinical medicine ,Fusobacterium mortiferum ,RNA, Ribosomal, 16S ,Bacteroides ,Humans ,Adenovirus ,Medicine ,Child ,Myasthenia gravis ,Clostridiales ,biology ,business.industry ,Megamonas hypermegale ,Area under the curve ,General Medicine ,Fusobacterium ,biology.organism_classification ,medicine.disease ,Gastrointestinal Microbiome ,Megamonas funiformis ,030104 developmental biology ,Metagenome ,Metagenomics ,business ,030217 neurology & neurosurgery ,Research Article - Abstract
Background Myasthenia gravis (MG) is an acquired immune-mediated disorder of the neuromuscular junction that causes fluctuating skeletal muscle weakness and fatigue. Pediatric MG and adult MG have many different characteristics, and current MG diagnostic methods for children are not quite fit. Previous studies indicate that alterations in the gut microbiota may be associated with adult MG. However, it has not been determined whether the gut microbiota are altered in pediatric MG patients. Methods Our study recruited 53 pediatric MG patients and 46 age- and gender-matched healthy controls (HC). We sequenced the fecal samples of recruited individuals using whole-genome shotgun sequencing and analyzed the data with in-house bioinformatics pipeline. Results We built an MG disease classifier based on the abundance of five species, Fusobacterium mortiferum, Prevotella stercorea, Prevotella copri, Megamonas funiformis, and Megamonas hypermegale. The classifier obtained 94% area under the curve (AUC) in cross-validation and 84% AUC in the independent validation cohort. Gut microbiome analysis revealed the presence of human adenovirus F/D in 10 MG patients. Significantly different pathways and gene families between MG patients and HC belonged to P. copri, Clostridium bartlettii, and Bacteroides massiliensis. Based on functional annotation, we found that the gut microbiome affects the production of short-chain fatty acids (SCFAs), and we confirmed the decrease in SCFA levels in pediatric MG patients via serum tests. Conclusions The study indicated that altered fecal microbiota might play vital roles in pediatric MG’s pathogenesis by reducing SCFAs. The microbial markers might serve as novel diagnostic methods for pediatric MG.
- Published
- 2021
47. Channel estimation for iterative MIMO OFDM/OQAM transceivers.
- Author
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Jean-Philippe Javaudin and Yiqi Jiang
- Published
- 2008
48. An Empirical Study of Vehicle Re-Identification on the AI City Challenge
- Author
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Hao Luo, Yuqi Zhang, Chong Liu, Yiqi Jiang, Xianzhe Xu, Hao Li, Weihua Chen, Shuting He, Jianyang Gu, and Fan Wang
- Subjects
FOS: Computer and information sciences ,business.industry ,Computer science ,Computer Vision and Pattern Recognition (cs.CV) ,Computer Science - Computer Vision and Pattern Recognition ,Machine learning ,computer.software_genre ,Synthetic data ,Data modeling ,Task (computing) ,Empirical research ,Discriminative model ,Test set ,Artificial intelligence ,business ,Representation (mathematics) ,Focus (optics) ,computer - Abstract
This paper introduces our solution for the Track2 in AI City Challenge 2021 (AICITY21). The Track2 is a vehicle re-identification (ReID) task with both the real-world data and synthetic data. We mainly focus on four points, i.e. training data, unsupervised domain-adaptive (UDA) training, post-processing, model ensembling in this challenge. (1) Both cropping training data and using synthetic data can help the model learn more discriminative features. (2) Since there is a new scenario in the test set that dose not appear in the training set, UDA methods perform well in the challenge. (3) Post-processing techniques including re-ranking, image-to-track retrieval, inter-camera fusion, etc, significantly improve final performance. (4) We ensemble CNN-based models and transformer-based models which provide different representation diversity. With aforementioned techniques, our method finally achieves 0.7445 mAP score, yielding the first place in the competition. Codes are available at https://github.com/michuanhaohao/AICITY2021_Track2_DMT., Comment: CVPR 2021 AI CITY CHALLENGE City-Scale Multi-Camera Vehicle Re-Identification Top 1. arXiv admin note: text overlap with arXiv:2004.10547
- Published
- 2021
49. Combined Biosynthetic Pathway Engineering and Storage Pool Expansion for High-Level Production of Ergosterol in Industrial Saccharomyces cerevisiae
- Author
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Sun Zhijiao, Yiqi Jiang, Guo-Si Li, Jianping Lin, Mianbin Wu, Lirong Yang, Jiazhang Lian, Hai-Long Xue, and Zhu Li
- Subjects
0106 biological sciences ,Histology ,Saccharomyces cerevisiae ,Biomedical Engineering ,Bioengineering ,01 natural sciences ,Metabolic engineering ,03 medical and health sciences ,chemistry.chemical_compound ,010608 biotechnology ,Lipid biosynthesis ,polycyclic compounds ,030304 developmental biology ,0303 health sciences ,Ergosterol ,biology ,ergosterol ,two-stage fed-batch fermentation ,Chemistry ,lipid biosynthesis ,biology.organism_classification ,Yeast ,Sterol ,Pyruvate carboxylase ,Biochemistry ,Fermentation ,lipids (amino acids, peptides, and proteins) ,metabolic engineering ,TP248.13-248.65 ,Biotechnology - Abstract
Ergosterol, a terpenoid compound produced by fungi, is an economically important metabolite serving as the direct precursor of steroid drugs. Herein, ergsosterol biosynthetic pathway modification combined with storage capacity enhancement was proposed to synergistically improve the production of ergosterol in Saccharomyces cerevisiae. S. cerevisiae strain S1 accumulated the highest amount of ergosterol [7.8 mg/g dry cell weight (DCW)] among the wild-type yeast strains tested and was first selected as the host for subsequent metabolic engineering studies. Then, the push and pull of ergosterol biosynthesis were engineered to increase the metabolic flux, overexpression of the sterol acyltransferase gene ARE2 increased ergosterol content to 10 mg/g DCW and additional overexpression of a global regulatory factor allele (UPC2-1) increased the ergosterol content to 16.7 mg/g DCW. Furthermore, considering the hydrophobicity sterol esters and accumulation in lipid droplets, the fatty acid biosynthetic pathway was enhanced to expand the storage pool for ergosterol. Overexpression of ACC1 coding for the acetyl-CoA carboxylase increased ergosterol content from 16.7 to 20.7 mg/g DCW. To address growth inhibition resulted from premature accumulation of ergosterol, auto-inducible promoters were employed to dynamically control the expression of ARE2, UPC2-1, and ACC1. Consequently, better cell growth led to an increase of ergosterol content to 40.6 mg/g DCW, which is 4.2-fold higher than that of the starting strain. Finally, a two-stage feeding strategy was employed for high-density cell fermentation, with an ergosterol yield of 2986.7 mg/L and content of 29.5 mg/g DCW. This study provided an effective approach for the production of ergosterol and other related terpenoid molecules.
- Published
- 2021
50. Workplace thriving in China
- Author
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Ingrid Nielsen, Yiqi Jiang, and Zhou Jiang
- Subjects
Organizational Behavior and Human Resource Management ,ComputingMilieux_THECOMPUTINGPROFESSION ,Goal orientation ,business.industry ,Strategy and Management ,media_common.quotation_subject ,05 social sciences ,050109 social psychology ,Context (language use) ,Ambiguity ,Public relations ,Business economics ,Management of Technology and Innovation ,Scale (social sciences) ,0502 economics and business ,Mediation ,Thriving ,0501 psychology and cognitive sciences ,Sociology ,Construct (philosophy) ,business ,050203 business & management ,media_common - Abstract
Purpose Workplace thriving is a psychological state that promotes employee health and development. In addition to presenting a useful instrument that captures the nature of a thriving work life in China, the purpose of this paper is to investigate important factors that influence one’s thriving status within this national context. Design/methodology/approach Using diverse approaches across different samples, Study 1 contextualized the content of a workplace thriving scale (WTS) to fit the Chinese context. Study 2 tested the effects of learning goal orientation, exploration at work and role ambiguity on workplace thriving, employing a mediation model. As a supplement, Study 3 examined the test–retest reliability of workplace thriving. Findings Study 1 confirmed that in the Chinese setting, workplace thriving is a higher order construct represented by both a sense of learning and a sense of vitality. Study 2 found that learning goal orientation and exploration at work fostered thriving, while role ambiguity reduced thriving. Also, exploration mediated the relationship between learning goal orientation and thriving. Study 3 verified that the WTS was reliable over time in the Chinese setting, further increasing the reliability of results from Studies 1 and 2. Originality/value By rigorously and formally contextualizing the concept/construct of workplace thriving in China, this paper is informative for future research on thriving at work in Eastern cultures.
- Published
- 2019
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