150 results on '"Tianqi Zhu"'
Search Results
2. Study on frictional behavior of SiCf/SiC composite clad tube clamping condition under nuclear irradiation
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Chenglong Xiao, Liangliang Shen, Tianqi Zhu, Jianbo Tang, Ximing Xie, Xinyu Fan, Jian Xu, and Zhiying Ren
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SiCf/SiC Clad tube ,nuclear irradiation conditions ,Greenwood-Williamson tribological model ,multi-surface integral ,Mechanical engineering and machinery ,TJ1-1570 - Abstract
Abstract Silicon carbide fiber reinforced silicon carbide matrix (SiCf/SiC) composite is the key cladding material of nuclear fuel, which determines the safety and reliability of nuclear fuel storage and transportation. The replacement of its storage and transportation scenario needs to be completed by the manipulator, but the application of SiCf/SiC wear, fracture, and nuclear leakage in the snatching process of brittle-flexible-rigid contact in the irradiation environment has been seriously restricted due to unclear understanding of the damage mechanism. Therefore, the effects of irradiation dose and clamping load on the friction characteristics of the contact interface between SiCf/SiC clad tube are studied in this paper, and the effects of irradiation parameters and clamping force on the static friction coefficient of the contact interface between the clad tube and flexible nitrile are obtained. Based on the Greenwood-Williamson tribological model, a numerical model of the shape and structure of the contact micro-convex at the micro-scale of the clamping interface is constructed by introducing the multi-surface integral, and finally verified by experiments. The research results show that there is a unique “Irradiation suppression zone” under the clamping condition of SiCf/SiC cladding tube under the nuclear irradiation environment, and the growth of static friction coefficient slows down until stagnates after irradiation reaches a certain extent (600 kGy), and there will be a decline when the irradiation dose continues to increase, among which the clamping force of 15.2 N within the irradiation interval of 1,000 kGy can meet the safety of nuclear environment operation. The results of this paper can provide an important theoretical basis and application guidance for the safe operation of SiCf/SiC cladding tubes in the storage and transportation clamping process.
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- 2023
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3. Mitochondria of Porcine Oocytes Synthesize Melatonin, Which Improves Their In Vitro Maturation and Embryonic Development
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Tianqi Zhu, Laiqing Yan, Shoulong Deng, Wenkui Ma, Fan Xia, Likai Wang, Xiao Ma, Guangdong Li, Zixia Shen, Yiwei Wang, Yao Fu, Pengyun Ji, Bingyuan Wang, Lu Zhang, and Guoshi Liu
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porcine oocyte ,mitochondria ,melatonin ,electron transport chain ,in vitro maturation ,Therapeutics. Pharmacology ,RM1-950 - Abstract
The in vitro maturation efficiency of porcine oocytes is relatively low, and this limits the production of in vitro porcine embryos. Since melatonin is involved in mammalian reproductive physiology, in this study, we have explored whether endogenously produced melatonin can help in porcine oocyte in vitro maturation. We have found, for the first time in the literature, that mitochondria are the major sites for melatonin biosynthesis in porcine oocytes. This mitochondrially originated melatonin reduces ROS production and increases the activity of the mitochondrial respiratory electron transport chain, mitochondrial biogenesis, mitochondrial membrane potential, and ATP production. Therefore, melatonin improves the quality of oocytes and their in vitro maturation. In contrast, the reduced melatonin level caused by siRNA to knockdown AANAT (siAANAT) is associated with the abnormal distribution of mitochondria, decreasing the ATP level of porcine oocytes and inhibiting their in vitro maturation. These abnormalities can be rescued by melatonin supplementation. In addition, we found that siAANAT switches the mitochondrial oxidative phosphorylation to glycolysis, a Warburg effect. This metabolic alteration can also be corrected by melatonin supplementation. All these activities of melatonin appear to be mediated by its membrane receptors since the non-selective melatonin receptor antagonist Luzindole can blunt the effects of melatonin. Taken together, the mitochondria of porcine oocytes can synthesize melatonin and improve the quality of oocyte maturation. These results provide an insight from a novel aspect to study oocyte maturation under in vitro conditions.
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- 2024
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4. The impact of rural e-commerce participation on farmers' entrepreneurial behavior: Evidence based on CFPS data in China.
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Haiying Lin, Huayuan Wu, Haihua Lin, Tianqi Zhu, Muhammad Umer Arshad, Haonan Chen, and Wenlong Li
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Medicine ,Science - Abstract
The "Three Rural Issues", encompass challenges related to agriculture, farmer, and rural area, which hold significant importance in driving comprehensive rural revitalization efforts in China. Farmer entrepreneurship, as a crucial means to enhance productivity, create job opportunities, and increase residents' income, has gradually become a key driving force in promoting rural revitalization in the new stage of development in China. With the rapid development of rural e-commerce, farmer entrepreneurship has encountered new opportunities. This study utilizes the 2020 China Family Panel Studies (CFPS) data and employs a structural equation model (SEM) to analyze the direct impact of rural e-commerce participation on farmer entrepreneurial behavior, considering factors such as human capital, social capital, and network infrastructure. This study further explores the indirect effects and mechanisms of e-commerce participation as a mediating variable and analyzes the impact and mechanisms on agricultural entrepreneurship behavior. The findings are as follows: (1) E-commerce participation significantly promotes farmer entrepreneurial behavior; (2) E-commerce participation as a mediating variable has a positive indirect effect on the relationship between social trust, network infrastructure, human capital, and farmer entrepreneurial behavior; (3) E-commerce participation has a significant positive influence on farmer entrepreneurship in the agricultural sector, and farmers with higher levels of network infrastructure and human capital have a higher probability of choosing agricultural entrepreneurship under the influence of e-commerce participation. Finally, this study provides policy recommendations in terms of infrastructure construction, entrepreneurial policy environment, and education level, aiming to optimize the situation of farmer entrepreneurship and contribute to the comprehensive promotion of rural revitalization.Overall, the research in this paper effectively combines theory and empirical evidence to outline the direct and indirect impact mechanisms of rural e-commerce participation on farmers' entrepreneurial behavior and agriculture-related entrepreneurial behavior and to test the effects of their impacts. First, most of the existing literature deals with farmers in individual sample areas, while the sample selected in this paper is farmers in the whole country, which is relatively more generalizable; second, most of the previous studies explore the level of e-commerce in the inter-provincial or county areas, while this paper expands the empirical study of rural e-commerce on the entrepreneurial behavior of farmers and the micro-period of agricultural entrepreneurial behavior, and focuses on the impacts of the e-commerce activities of farmers on their entrepreneurial behavior.
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- 2024
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5. Design and Biomechanical Properties of Symmetrical Lumbar Fusion Cage Based on Lightweight Titanium Alloy Flexible Microporous Metal Rubber
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Juan Xiao, Tianqi Zhu, Linlin Li, Liangliang Shen, Zhiying Ren, and Jian Xu
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symmetrical lumbar fusion cage ,metal rubber ,biomechanics ,dynamic performance ,impact resistance ,Mathematics ,QA1-939 - Abstract
In recent years, the incidence rate of lumbar diseases has been progressively increasing. The conventional lumbar fusion cages used in existing lumbar interbody fusion surgery are not able to take into account the multiple characteristics of cushioning, vibration reduction, support, cell adhesion, and bone tissue growth. Therefore, in this work, based on the CT data of a lumbar intervertebral disc plain scan, a combined symmetric lumbar fusion cage structure was innovatively designed. The core was made of lightweight TC4 medical titanium alloy flexible microporous metal rubber (LTA-FMP MR), and the outer frame was made of cobalt–chromium–molybdenum alloy. Its comprehensive biomechanical performance was comprehensively evaluated through finite element simulation, static and dynamic mechanics, and impact resistance tests. The three-dimensional model of the L3/L4 lumbar segment was established by reverse engineering, and a Mises stress analysis was conducted on the lumbar fusion cage by importing it into Ansys to understand its structural advantages compared to the traditional lumbar fusion cage. Through static experiments, the influence of the internal nucleus of a symmetrical lumbar fusion cage with different material parameters on its static performance was explored. At the same time, to further explore the superior characteristics of this symmetrical structure in complex human environments, a biomechanical test platform was established to analyze its biomechanical performance under sinusoidal excitation of different amplitudes and frequencies, as well as impact loads of different amplitudes and pulse widths. The results show that under different amplitudes and frequencies, the lumbar fusion cage with a symmetrical structure has a small loss factor, a high impact isolation coefficient, and a maximum energy consumption of 422.8 N·mm, with a maximum kinetic energy attenuation rate of 0.43. Compared to existing traditional lumbar fusion cages in clinical practice, it not only has sufficient stiffness, but also has good vibration damping, support, and impact resistance performance, and has a lower probability of postoperative settlement, which has broad application prospects.
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- 2023
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6. Combined Cold and Drought Stress-Induced Response of Photosynthesis and Osmotic Adjustment in Elymus nutans Griseb.
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Bowen Liu, Ruijia Wang, Jiongjiong Gong, Tianqi Zhu, Si Long, Huan Guo, Tieyuan Liu, Peizhi Yang, and Yuefei Xu
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chloroplast ultrastructure ,combined stress ,Elymus nutans Griseb. ,osmotic adjustment ,photosynthesis ,stomatal properties ,Agriculture - Abstract
Elymus nutans Griseb. is a dominant forage in the Qinghai–Tibetan Plateau. However, the combined cold and drought (CD) stress is a major problem inhibiting its growth, development, and yield. Here, the responses of morphological, photosynthetic, osmoregulation levels, and signal transduction under cold, drought, and CD stress were explored. Both cold- and drought-stressed plants showed varying degrees of damage. In addition, CD stress led to more severe damage than single stress, especially in total biomass, photosynthetic capacity, and electron transfer efficiency. The total biomass, net photosynthetic rate, and maximal quantum yield of photosystem II (PSII) photochemistry reduced by 61.47%, 95.80%, and 16.06% in comparison with the control, respectively. Meanwhile, CD stress was accompanied by lower chlorophyll contents, down-regulated expression level of key photosynthetic enzymes (EnRbcS, EnRbcL, and EnRCA), stomatal closure, disrupted chloroplast ultrastructure, and reduced starch content. Furthermore, CD stress induced some adaptability responses in cold- and drought-tolerant E. nutans seedlings. The combined stress provoked alterations in both cold- and drought-related transcription factors and responsive genes. EnCBF12, EnCBF9, EnCBF14, and EnCOR14α were significantly up-regulated under cold or drought stress, and the transcript level of EnCBF3 and EnCBF12 was even 2.94 and 12.59 times higher than control under CD treatment, which indicated the key role of transcription factors activation in coping with CD stress. In addition, the content of soluble sugar, reducing sugar, proline, glycine betaine, and other osmolytes was significantly improved under CD stress. Therefore, we demonstrated that exposure to CD stress led to severe morphological and photosynthetic damage and revealed the acclimation to the cold and drought stress combination via osmotic adjustment and transcription factors activation in the Tibetan wild E. nutans.
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- 2023
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7. Treatment of postoperative intestinal dysfunction of hirschsprung's disease based on the principle of 'anorectal balance'
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Li Tian, Chensen Ma, Zhengdong Deng, Tianqi Zhu, Xiang Zhao, Ying He, Mingfa Wei, Jiexiong Feng, and Donghai Yu
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anorectal balance ,hirschsprung’s disease ,intestinal dysfunction ,botulinum toxin ,internal anal sphincter ,Surgery ,RD1-811 - Abstract
PurposeRadical surgery is the most effective treatment for Hirschsprung's disease. However, some children still have symptoms of intestinal dysfunction such as constipation, abdominal distension, and recurrent enterocolitis after operation. The purpose of this study was to evaluate treatment outcomes of postoperative intestinal dysfunction in children with Hirschsprung's disease by using the principle of “anorectal balance”.MethodsThe clinical data of postoperative intestinal dysfunction in children with Hirschsprung's disease in the single treatment group from July 2019 to July 2021 were retrospectively analyzed. All the enrolled children underwent botulinum toxin injection (2.5 U/kg); 3 to 6 months later, the injection was performed again; the children who had received more than two botulinum toxin injections underwent the internal sphincter myectomy. Anorectal manometry was performed routinely after operation, and abdominal distension and defecation were recorded.ResultsA total of thirty children with postoperative intestinal dysfunction underwent radical surgery for Hirschsprung's disease were included in this study. Symptoms of constipation, abdominal distension and enterocolitis were improved after botulinum toxin injections in most children compared to before surgery (P
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- 2022
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8. The utility of the 24-h delayed film of barium enema for detecting the dysganglionic bowel segment in Hirschsprung’s disease
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Bingyan Zhou, Di Wang, Ke Chen, Yonghua Niu, Chunlei Jiao, Tianqi Zhu, and Jiexiong Feng
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Hirschsprung’s disease ,24-h delayed film of barium enema ,rectal biopsy ,resection strategy ,dysganglionic bowel segment ,Pediatrics ,RJ1-570 - Abstract
BackgroundPreoperative evaluation of the dysganglionic bowel segment is critical for establishing the optimal resection strategy for Hirschsprung’s disease (HSCR), which facilitates patient outcomes.ObjectiveWe set out to determine the utility of the 24-h delayed film of barium retention in predicting the length of dysganglionic bowel segment in HSCR.Materials and methodsA retrospective study of patients with clinically suspicious HSCR who underwent a preoperative 24-h delayed film of barium enema and were surgically treated from January 2015 to December 2019 was conducted.ResultsTwo hundred and 58 patients were enrolled in this study. The sensitivity, specificity, positive and negative predictive values (NPVs) of the 24-h delayed film of barium enema to predict the neuropathological segment were 89.1, 91.5, 91.3, and 89.4%, respectively. The Youden index was 80.6%, with a kappa value of 0.806 (P < 0.001). The correlation rate between barium retention level and pathological results was 72.7% (16/22) when aganglionosis was restricted within the mid-distal rectum (short-segment type), increasing to 92.0% (46/50) and 93.5% (174/186) for patients that had aganglionosis extended beyond the mid-distal rectum (classical type) and sigmoid colon (long-segment type), respectively. Lastly, patients younger than 3 months showed a lower correlation rate (72.2%) compared to patients aged 3–12 months (91.0%) and > 12 months (92.6%).ConclusionsOur investigation of the 24-h delayed film of barium enema performed for patients suspected of having HSCR indicated that the barium retention level remains crucial in predicting dysganglionic bowel segment, which contributes to the decision-making for surgical physicians.
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- 2022
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9. Identification and validation of the common pathogenesis and hub biomarkers in Hirschsprung disease complicated with Crohn’s disease
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Jing Wang, Zejian Li, Jun Xiao, Luyao Wu, Ke Chen, Tianqi Zhu, Chenzhao Feng, Didi Zhuansun, Xinyao Meng, and Jiexiong Feng
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Crohn’s disease ,Hirschsprung disease ,hub genes ,diagnostic model ,CXCL10 ,Immunologic diseases. Allergy ,RC581-607 - Abstract
BackgroundAlthough increasing evidence has supported that Hirschsprung disease (HSCR) is the risk factor for children developing Crohn’s disease (CD), the common mechanism of its co-occurrence remains unknown. The purpose of this study is to further explore the underlying mechanism and biomarkers for the co-occurrence of HSCR and CD.MethodsThe Gene Expression Omnibus (GEO) database was used to obtain gene expression profiles for CD (GSE95095) and HSCR (GSE98502). Following the identification of the shared differentially expressed genes (DEGs) of CD and HSCR, functional annotation, protein–protein interaction (PPI) network creation, and module assembly were performed to discover hub genes. RT-qPCR was performed to validate the expression of the hub genes in HSCR samples. The receiver operating characteristic (ROC) curve was utilized to assess the accuracy of the hub genes as biomarkers in predicting CD in both the training dataset and test dataset.ResultsA total of 103 common DEGs (50 downregulated genes and 53 upregulated genes) were chosen for further investigation. The importance of chemokines and cytokines in these two disorders is highlighted by functional analysis. MCODE plug identified three important modules, which functionally enriched the immune system process. Finally, nine hub genes were identified using cytoHubba, including IL1B, IL10, CXCL10, ICAM1, EGR1, FCGR3A, S100A12, S100A9, and FPR1. The nine hub genes were mainly enriched in immune- and inflammation-related pathways. External data profiles and RT-qPCR confirmed the expression of the nine hub genes in HSCR and CD. ROC analysis revealed that the nine hub genes had a strong diagnostic value.ConclusionOur study reveals the common pathogenesis of HSCR and CD. These hub genes and diagnostic models may provide novel insight for the diagnosis and treatment of HSCR complicated with CD.
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- 2022
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10. Predicting the Prognosis of Patients in the Coronary Care Unit: A Novel Multi-Category Machine Learning Model Using XGBoost
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Xingchen Wang, Tianqi Zhu, Minghong Xia, Yu Liu, Yao Wang, Xizhi Wang, Lenan Zhuang, Danfeng Zhong, Jun Zhu, Hong He, Shaoxiang Weng, Junhui Zhu, and Dongwu Lai
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MIMIC-III ,coronary care unit (CCU) ,machine learning ,multi-category ,prognosis ,XGBoost ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
BackgroundEarly prediction and classification of prognosis is essential for patients in the coronary care unit (CCU). We applied a machine learning (ML) model using the eXtreme Gradient Boosting (XGBoost) algorithm to prognosticate CCU patients and compared XGBoost with traditional classification models.MethodsCCU patients' data were extracted from the MIMIC-III v1.4 clinical database, and divided into four groups based on the time to death:
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- 2022
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11. Enterocolitis Is a Risk Factor for Bowel Perforation in Neonates With Hirschsprung's Disease: A Retrospective Multicenter Study
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Tianqi Zhu, Guofeng Zhang, Xinyao Meng, Jixin Yang, Yonghua Niu, Ying He, Heying Yang, Xiaofeng Xiong, and Jiexiong Feng
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Hirschsprung disease ,bowel perforation ,enterocolitis ,risk factor ,neonates ,Pediatrics ,RJ1-570 - Abstract
Background and AimWe evaluated the clinical features of neonatal Hirschsprung's disease (HD)-associated bowel perforation (perforated HD) and investigated risk factors related to it.MethodsWe retrospectively collected clinical data of neonates (
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- 2022
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12. Influence of LDL-Cholesterol Lowering on Coronary Plaque Progression of Non-Target Lesions in Patients Undergoing Percutaneous Coronary Intervention: Findings from a Retrospective Study
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Weiwei Quan, Hui Han, Lili Liu, Yi Sun, Zhengbin Zhu, Run Du, Tianqi Zhu, and Ruiyan Zhang
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LDL-C ,plaque progression ,non-target lesion ,quantitative coronary angiography ,Medicine - Abstract
The progression of NTLs after PCI accounts for a significant portion of future adverse cardiac events. The reduction in LDL-C reduces cardiovascular events. This has, however, not yet been shown in a real-world setting. We aimed to investigate the association between LDL-C changes with progression in NTLs. A total of 847 patients with successful PCI were enrolled. Patients with follow-up LDL-C ≥ 1.4 mmol/L or percent reduction n = 793); patients with follow-up LDL-C < 1.4 mmol/L and percent reduction ≥50% compared to baseline were Optimal group (n = 54). Compared to Non-optimal group, Optimal group presented a lower rate of NTL plaque progression (11.11% vs. 23.96%; p = 0.007) and a lower follow-up TC (2.77 ± 0.59 vs. 3.66 ± 0.97; p < 0.001) and LDL-C (1.09 ± 0.26 vs. 2.03 ± 0.71; p < 0.001). The univariate logistic regression analysis revealed that follow-up LDL-C < 1.4 mmol/L and a percent reduction ≥50% from baseline was a protective factor for NTL plaque progression (OR: 0.397; 95%CI: 0.167–0.941; p = 0.036). The multivariate logistic regression model revealed that follow-up LDL-C < 1.4 mmol/L and percent reduction ≥50% was indeed an independent factor associated with a lower rate of plaque progression of NTLs (OR: 0.398; 95% CI: 0.167–0.945; p = 0.037). Therefore, achieving guideline-recommended LDL-C level was associated with a significantly reduced risk of NTL plaque progression.
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- 2023
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13. Paclobutrazol Ameliorates Low-Light-Induced Damage by Improving Photosynthesis, Antioxidant Defense System, and Regulating Hormone Levels in Tall Fescue
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Bowen Liu, Si Long, Kening Liu, Tianqi Zhu, Jiongjiong Gong, Shuanghong Gao, Ruijia Wang, Liyun Zhang, Tieyuan Liu, and Yuefei Xu
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antioxidant system ,hormone levels ,low-light tolerance ,paclobutrazol ,photosynthesis ,tall fescue ,Biology (General) ,QH301-705.5 ,Chemistry ,QD1-999 - Abstract
Paclobutrazol (PBZ) is a plant-growth regulator (PGR) in the triazole family that enhances plant tolerance to environmental stresses. Low-light (LL) intensity is a critical factor adversely affecting the growth of tall fescue (Festuca arundinacea Schreb.). Therefore, in this study, tall fescue seedlings were treated with PBZ under control and LL conditions to investigate the effects of PBZ on enhancing LL stress resistance by regulating the growth, photosynthesis, oxidative defense, and hormone levels. Our results reveal that LL stress reduced the total biomass, chlorophyll (Chl) content, photosynthetic capacity, and photochemical efficiency of photosystem II (PSII) but increased the membrane lipid peroxidation level and reactive oxygen species (ROS) generation. However, the application of PBZ increased the photosynthetic pigment contents, net photosynthetic rate (Pn), maximum quantum yield of PSII photochemistry (Fv/Fm), ribulose-1,5-bisphosphate carboxylase (RuBisCO) activity, and starch content. In addition, PBZ treatment activated the antioxidant enzyme activities, antioxidants contents, ascorbate acid-glutathione (AsA-GSH) cycle, and related gene expression, lessening the ROS burst (H2O2 and O2∙−). However, the gibberellic acid (GA) anabolism was remarkably decreased by PBZ treatment under LL stress, downregulating the transcript levels of kaurene oxidase (KO), kaurenoic acid oxidase (KAO), and GA 20-oxidases (GA20ox). At the same time, PBZ treatment up-regulated 9-cis-epoxycarotenoid dioxygenase (NCED) gene expression, significantly increasing the endogenous abscisic acid (ABA) concentration under LL stress. Thus, our study revealed that PBZ improves the antioxidation and photosynthetic capacity, meanwhile increasing the ABA concentration and decreasing GA concentration, which ultimately enhances the LL stress tolerance in tall fescue.
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- 2022
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14. Corrigendum: Melatonin Modulates Lipid Metabolism in Porcine Cumulus–Oocyte Complex via Its Receptors
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Tianqi Zhu, Shengyu Guan, Dongying Lv, Mengmeng Zhao, Laiqing Yan, Li Shi, Pengyun Ji, Lu Zhang, and Guoshi Liu
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melatonin ,cumulus cell ,oocyte ,lipid metabolism ,melatonin receptor ,Biology (General) ,QH301-705.5 - Published
- 2021
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15. Colonoscopic Diagnosis of Postoperative Gastrointestinal Bleeding in Patients With Hirschsprung's Disease
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Jixin Yang, Tianqi Zhu, Xiaojuan Wu, Mingfa Wei, Guo Wang, and Jiexiong Feng
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Hirschsprung disease ,gastrointestinal bleeding ,enterocolitis ,colonoscopy ,hematochezia ,Pediatrics ,RJ1-570 - Abstract
Aim: Postoperative lower gastrointestinal bleeding in children with Hirschsprung's Disease (HSCR) is a non-specific symptom, which may be caused by various etiologies. Our current study aims to utilize colonoscopy to diagnose the causes of postoperative hematochezia and to analyze its feasibility, accuracy, and safety.Methods: Twenty-four patients with HSCR with postoperative lower gastrointestinal bleeding or occult blood in the stool were enrolled in this study. The postoperative onset duration, age at examination, accompanied anomalies were recorded. After bowel preparation, all patients underwent colonoscopy. According to visual findings, mucosal biopsy was performed, followed by pathological diagnosis. Further treatment was determined according to the visual findings and pathological diagnosis. All patients were followed up for 6 months including therapeutic outcomes and recurrence of symptoms.Results: The mean onset duration was (221.3 ± 216.8) days postoperatively (ranging from 25 to 768 days). The mean age at examination was (41.0 ± 29.4) months. There was no significant difference in the onset days among each group (all, p > 0.05). Based on visual and pathological findings, there were 11 cases of HSCR associated enterocolitis (HAEC), 4 cases of anastomotic leakage, 7 cases of anastomotic inflammation, 1 case of juvenile polyp, and 1 case of inflammatory pseudopolyp. Intraluminal saline irrigation, thrombin treatment or colorectal polyp electrocision was performed according to intraoperative diagnosis. Patients with HEAC and anastomotic inflammation underwent antibiotics therapy and colorectal irrigation. Patients with leakage underwent reoperation. The highest incidence of accompanied symptoms of diarrhea existed in HEAC group (p = 0.02) and fever in leakage group (p = 0.02), respectively. No perforation or aggravated bleeding occurs in any patients. All patients gained uneventful recovery during follow-up period.Conclusions: Colonoscopy is a safe, accurate and timely examination for HSCR patients with postoperative lower gastrointestinal bleeding. The visual findings and biopsy may provide accurate diagnosis and guide treatment for this subset of patients.
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- 2021
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16. Short-Term Electrical Load Forecasting Based on VMD and GRU-TCN Hybrid Network
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Changchun Cai, Yuanjia Li, Zhenghua Su, Tianqi Zhu, and Yaoyao He
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short-term load forecasting ,variational modal decomposition (VMD) ,gated recurrent unit (GRU) ,time convolutional network (TCN) ,hybrid algorithm ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
With the continuous increase in user-side flexible controllable resources connected into a distribution system, the components of electrical load become too diverse and difficult to be accuracy forecasted. A short-term load forecast method that integrates variational modal decomposition (VMD), gated recurrent unit (GRU) and time convolutional network (TCN) into a hybrid network is proposed in this paper. Firstly, original electrical load sequence data with noise are decomposed into intrinsic IMF components with different frequencies and amplitudes based on the VMD method. Secondly, a combined load forecasting method based on the GRU and TCN network is proposed for the high and low-frequency load subsequent signals, respectively. Finally, the high and low-frequency signals forecasting results of the GRU and TCN network are rebuilt for the final load forecasting. The experiment results based on actual operation data (data set 1) and simulation data (data set 2), which show that the proposed method can reduce the forecasting error by 36.20% and 10.8%, respectively, in comparison with VMD-GRU. The reliability and accuracy of the proposed method is verified through the comparison with other methods such as LSTM, Prophet and XG Boost.
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- 2022
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17. Melatonin Modulates Lipid Metabolism in Porcine Cumulus–Oocyte Complex via Its Receptors
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Tianqi Zhu, Shengyu Guan, Dongying Lv, Mengmeng Zhao, Laiqing Yan, Li Shi, Pengyun Ji, Lu Zhang, and Guoshi Liu
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melatonin ,cumulus cell ,oocyte ,lipid metabolism ,melatonin receptor ,Biology (General) ,QH301-705.5 - Abstract
Lipid is a crucial energy resource for mammalian oocyte. Melatonin could benefit the maturation of porcine oocyte in vitro, but the related mechanism is not elucidated yet. In the current study, methods to monitor lipid metabolism in single live oocytes were firstly established using probes (Lipi-Blue and Lipi-Green). It was observed that both lipid biogenesis and lipolysis occurred in maturing oocyte, but the general level of lipids dropped. Then maturing oocytes stained with probes were treated with melatonin or lipid metabolic-related inhibitors (triacsin C, rotenone, or etomoxir). The results showed that the lipid metabolism and maturation of porcine oocytes were all disrupted and that melatonin rescued the oocytes treated with triacsin C or rotenone, but not those treated with etomoxir. Further investigation demonstrated that cumulus cells are able to transfer lipids to oocytes via gap junctions. It was also observed that melatonin receptors exist in cumulus cells and are required for oocytes to maintain lipid metabolism. Meanwhile, the global gene expressing in cumulus cells was also modulated by melatonin, especially the genes related to antioxidants (SOD1, GPX1, GPX3, GPX4, PRDX2, and PRDX5), lipid metabolism (FABP3, FABP5, ACACB, TECR, etc.), and mitochondrial respiration (GPD1, ETFB, CYC1, and the genes of ATP synthase). Altogether the current research demonstrates that melatonin modulates lipid metabolism in maturing oocytes through its receptors in cumulus cells and benefits the developmental competence of oocytes.
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- 2021
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18. Serum MG53/TRIM72 Is Associated With the Presence and Severity of Coronary Artery Disease and Acute Myocardial Infarction
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Hongyang Xie, Yaqiong Wang, Tianqi Zhu, Shuo Feng, Zijun Yan, Zhengbin Zhu, Jingwei Ni, Jun Ni, Run Du, Jinzhou Zhu, Fenghua Ding, Shengjun Liu, Hui Han, Hang Zhang, Jiaxin Zhao, Ruiyan Zhang, Weiwei Quan, and Xiaoxiang Yan
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MG53 ,coronary artery disease ,acute myocardial infarction ,biomarker ,risk stratification ,Physiology ,QP1-981 - Abstract
Background: Mitsugumin 53 or Tripartite motif 72 (MG53/TRIM72), a myokine/cardiokine belonging to the tripartite motif family, can protect the heart from ischemic injury and regulate lipid metabolism in rodents. However, its biological function in humans remains unclear. This study sought to investigate the relationship between circulating MG53 levels and coronary artery disease (CAD).Methods: The concentration of MG53 was measured by enzyme-linked immunosorbent assay (ELISA) in serum samples from 639 patients who underwent angiography, including 205 controls, 222 patients with stable CAD, and 212 patients with acute myocardial infarction (AMI). Logistic and linear regression analyses were used to analyze the relationship between MG53 and CAD.Results: MG53 levels were increased in patients with stable CAD and were highest in patients with AMI. Additionally, patients with comorbidities, such as chronic kidney disease (CKD) and diabetes also had a higher concentration of MG53. We found that MG53 is a significant diagnostic marker of CAD and AMI, as analyzed by logistic regression models. Multivariate linear regression models revealed that serum MG53 was significantly corelated positively with SYNTAX scores. Global Registry of Acute Coronary Events (GRACE) scores also correlated with serum MG53 levels, indicating that MG53 levels were associated with the severity of CAD and AMI after adjusting for multiple risk factors and clinical biomarkers.Conclusion: MG53 is a valuable diagnostic marker whose serum levels correlate with the presence and severity of stable CAD and AMI, and may represent a novel biomarker for diagnosing CAD and indicating the severity of CAD.
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- 2020
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19. Prognostic Value of Circulating MG53 Levels in Acute Myocardial Infarction
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Hongyang Xie, Zijun Yan, Shuo Feng, Tianqi Zhu, Zhengbin Zhu, Jingwei Ni, Jun Ni, Run Du, Jinzhou Zhu, Fenghua Ding, Shengjun Liu, Hui Han, Hang Zhang, Jiaxin Zhao, Ruiyan Zhang, Weiwei Quan, and Xiaoxiang Yan
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acute myocardial infarction ,risk stratification ,biomarker ,prognosis ,MG53 ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Background: Mitsugumin 53 (MG53), a muscle-specific protein belonging to the TRIM family, has been demonstrated to protect the heart against oxidative injury. Although previous studies indicated that ischemic hearts released MG53 into circulation in mice, its effects in humans remains unknown. We aimed to evaluate the prognostic value of MG53 in patients with ST-segment elevation myocardial infarction (STEMI).Methods: Serum levels of MG53 were measured in 300 patients with STEMI, all patients were followed for 3 years. The primary endpoint was major adverse cardiovascular events (MACE), defined as a composite of cardiovascular (CV) death, heart failure causing-rehospitalization, recurrent myocardial infarction (MI), and stroke.Results: Patients with a higher concentration of serum MG53 tended to be older, with a history of diabetes. MG53 levels were also highly associated with indicators reflecting heart function, such as left ventricular ejection fraction (LVEF), N terminal pro B type natriuretic peptide (NT-pro-BNP), and cardiac troponin I (cTnI) at baseline. Kaplan-Meier survival curves demonstrated that patients with MG53 levels above the cutoff value (132.17 pg/ml) were more likely to have MACEs. Moreover, it was found to be a significant predictor of CV death (HR: 6.12; 95% CI: 2.10–17.86; p = 0.001). Furthermore, the C-statistic and Integrated Discrimination Improvement (IDI) values for MACEs were improved with MG53 as an independent risk factor or when combined with cTnI.Conclusions: MG53 is a valuable prognostic marker of MACE in patients with AMI, independent of established conventional risk factors, highlighting the significance of MG53 in risk stratification post-MI.
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- 2020
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20. Short-Term Load Forecasting Based on Deep Learning Bidirectional LSTM Neural Network
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Changchun Cai, Yuan Tao, Tianqi Zhu, and Zhixiang Deng
- Subjects
bidirectional long short-term memory ,multi-layer stacked ,neural network ,short-term load forecasting ,power system ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
Accurate load forecasting guarantees the stable and economic operation of power systems. With the increasing integration of distributed generations and electrical vehicles, the variability and randomness characteristics of individual loads and the distributed generation has increased the complexity of power loads in power systems. Hence, accurate and robust load forecasting results are becoming increasingly important in modern power systems. The paper presents a multi-layer stacked bidirectional long short-term memory (LSTM)-based short-term load forecasting framework; the method includes neural network architecture, model training, and bootstrapping. In the proposed method, reverse computing is combined with forward computing, and a feedback calculation mechanism is designed to solve the coupling of before and after time-series information of the power load. In order to improve the convergence of the algorithm, deep learning training is introduced to mine the correlation between historical loads, and the multi-layer stacked style of the network is established to manage the power load information. Finally, actual data are applied to test the proposed method, and a comparison of the results of the proposed method with different methods shows that the proposed method can extract dynamic features from the data as well as make accurate predictions, and the availability of the proposed method is verified with real operational data.
- Published
- 2021
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21. Ultrasensitive and high-efficiency screen of de novo low-frequency mutations by o2n-seq
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Kaile Wang, Shujuan Lai, Xiaoxu Yang, Tianqi Zhu, Xuemei Lu, Chung-I Wu, and Jue Ruan
- Subjects
Science - Abstract
Detection ofde novo, low frequency mutations is important for characterising heterogeneous cell populations, such as those found in cancer cell populations. Here the authors present o2n-seq, an ultrasensitive method with highly efficient data usage for detection of rare mutations.
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- 2017
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22. Soil Bacterial and Fungal Composition and Diversity Responses to Seasonal Deer Grazing in a Subalpine Meadow
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Andéole Niyongabo Turatsinze, Baotian Kang, Tianqi Zhu, Fujiang Hou, and Saman Bowatte
- Subjects
Gansu red deer ,seasonal grazing ,metabarcoding ,Biology (General) ,QH301-705.5 - Abstract
Soil microbial composition and diversity are widely recognized for their role in ecological functioning. This study examined the differences of soil microbial communities between two seasonally grazed grasslands. The study area was in the Gansu red deer farm located on the Qilian Mountain range in the Gansu province of northwestern China. This farm adopted a seasonal rotation grazing system whereby grasslands at higher altitudes are grazed in summer (SG), whilst grasslands at lower altitudes are grazed in winter (WG). The soil bacterial and fungal communities were examined by Illumina MiSeq sequencing. We found that soil water content (SWC), organic carbon (OC), total carbon (TC), and total nitrogen (TN) were significantly higher, whereas the C/N ratio was significantly lower in SG than WG pastures. The α-diversity of bacteria was greater than that of fungi in both pastures, while both bacterial and fungal α-diversity were not significantly different between the pastures. The bacterial β-diversity was significantly different between the pastures, but fungal β-diversity was not. The bacterial phylum Actinobacteria and fungal phylum Ascomycota were dominant in both pastures. The relative abundance of Actinobacteria in soil was significantly higher in WG pastures, whereas the relative abundance of Proteobacteria in soil was significantly higher in SG pastures. Significant correlations between bacterial and fungal phyla and soil properties were observed, but this varied between the two grasslands. This study showed that distinct microbial community structures developed in two pastures within the same geographic location that were grazed in different seasons.
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- 2021
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23. Multi-Branch Convolutional Neural Network for Automatic Sleep Stage Classification with Embedded Stage Refinement and Residual Attention Channel Fusion
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Tianqi Zhu, Wei Luo, and Feng Yu
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sleep stage scoring ,neural network-based refinement ,residual attention ,Chemical technology ,TP1-1185 - Abstract
Automatic sleep stage classification of multi-channel sleep signals can help clinicians efficiently evaluate an individual’s sleep quality and assist in diagnosing a possible sleep disorder. To obtain accurate sleep classification results, the processing flow of results from signal preprocessing and machine-learning-based classification is typically employed. These classification results are refined based on sleep transition rules. Neural networks—i.e., machine learning algorithms—are powerful at solving classification problems. Some methods apply them to the first two processes above; however, the refinement process continues to be based on traditional methods. In this study, the sleep stage refinement process was incorporated into the neural network model to form real end-to-end processing. In addition, for multi-channel signals, the multi-branch convolutional neural network was combined with a proposed residual attention method. This approach further improved the model classification accuracy. The proposed method was evaluated on the Sleep-EDF Expanded Database (Sleep-EDFx) and University College Dublin Sleep Apnea Database (UCDDB). It achieved respective accuracy rates of 85.7% and 79.4%. The results also showed that sleep stage refinement based on a neural network is more effective than the traditional refinement method. Moreover, the proposed residual attention method was determined to have a more robust channel–information fusion ability than the respective average and concatenation methods.
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- 2020
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24. Responses of Transgenic Melatonin-Enriched Goats on LPS Stimulation and the Proteogenomic Profiles of Their PBMCs
- Author
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Minghui Yang, Jingli Tao, Hao Wu, Lu Zhang, Yujun Yao, Lixi Liu, Tianqi Zhu, Hao Fan, Xudai Cui, Haoran Dou, and Guoshi Liu
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melatonin ,proteogenomic analysis ,LPS ,PBMCs ,inflammation ,goat ,Biology (General) ,QH301-705.5 ,Chemistry ,QD1-999 - Abstract
The anti-inflammatory activity of melatonin (MT) has been well documented; however, little is known regarding endogenously occurring MT in this respect, especially for large animals. In the current study, we created a MT-enriched animal model (goats) overexpressing the MT synthetase gene Aanat. The responses of these animals to lipopolysaccharide (LPS) stimulation were systematically studied. It was found that LPS treatment exacerbated the inflammatory response in wild-type (WT) goats and increased their temperature to 40 °C. In addition, their granulocyte counts were also significantly elevated. In contrast, these symptoms were not observed in transgenic goats with LPS treatment. The rescue study with MT injection into WT goats who were treated with LPS confirmed that the protective effects in transgenic goats against LPS were attributed to a high level of endogenously produced MT. The proteomic analysis in the peripheral blood mononuclear cells (PBMCs) isolated from the transgenic animals uncovered several potential mechanisms. MT suppressed the lysosome formation as well as its function by downregulation of the lysosome-associated genes Lysosome-associated membrane protein 2 (LAMP2), Insulin-like growth factor 2 receptor (IGF2R), and Arylsulfatase B (ARSB). A high level of MT enhanced the antioxidant capacity of these cells to reduce the cell apoptosis induced by the LPS. In addition, the results also uncovered previously unknown information that showed that MT may have protective effects on some human diseases, including tuberculosis, bladder cancer, and rheumatoid arthritis, by downregulation of these disease-associated genes. All these observations warranted further investigations.
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- 2018
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25. Real-Time Dynamic Obstacle Avoidance for Robot Manipulators Based on Cascaded Nonlinear MPC With Artificial Potential Field.
- Author
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Tianqi Zhu, Jianliang Mao, Linyan Han, Chuanlin Zhang, and Jun Yang 0011
- Published
- 2024
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26. Flexible Active Safety Motion Control for Robotic Obstacle Avoidance: A CBF-Guided MPC Approach.
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Jinhao Liu, Jun Yang 0011, Jianliang Mao, Tianqi Zhu, Qihang Xie, Yimeng Li, Xiangyu Wang 0003, and Shihua Li 0001
- Published
- 2024
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27. Multitask Learning Using Feature Extraction Network for Smart Tourism Applications.
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Yu Li, Fanxiang Zeng, Nan Zhang, Zulong Chen, Li Zhou, Maolei Huang, Tianqi Zhu, and Jing Wang
- Published
- 2023
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28. Predictive value of early left ventricular end-diastolic volume changes for late left ventricular remodeling after ST-elevation myocardial infarction.
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Lei Yi, Tianqi Zhu, Xuezheng Qu, Keremu Buayiximu, Shuo Feng, Zhengbin Zhu, Jingwei Ni, Run Du, Jinzhou Zhu, Xiaoqun Wang, Fenghua Ding, Ruiyan Zhang, Weiwei Quan, and Xiaoxiang Yan
- Published
- 2024
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29. Layerwise Recurrent Autoencoder for Real-World Traffic Flow Forecasting.
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Junhui Zhao, Tianqi Zhu, Ruidong Zhao, and Peize Zhao
- Published
- 2019
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30. Temperature dependence of deposition behavior and corrosion resistance of zinc coatings electroplated on copper substrates from ethaline electrolyte
- Author
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Fan Jiang, Tianqi Zhu, Hongyan Wu, and Shaofu Li
- Subjects
General Chemical Engineering ,Materials Chemistry ,General Chemistry ,Biochemistry ,Industrial and Manufacturing Engineering - Published
- 2023
31. Attention Region Based Approach for Tracking Individuals in a Small School of Fish for Water Quality Monitoring.
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Gang Xiao 0001, Tengfei Shao, Tianqi Zhu, Yi Li, Jiafa Mao, and Zhenbo Cheng
- Published
- 2016
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32. Single-Nitrogen–Vacancy NMR of Amine-Functionalized Diamond Surfaces
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John M. Abendroth, Konstantin Herb, Erika Janitz, Tianqi Zhu, Laura A. Völker, and Christian L. Degen
- Subjects
Quantum Physics ,Condensed Matter - Materials Science ,Magnetic Resonance Spectroscopy ,Nitrogen ,Mechanical Engineering ,Materials Science (cond-mat.mtrl-sci) ,FOS: Physical sciences ,Bioengineering ,General Chemistry ,Condensed Matter Physics ,Oxygen ,General Materials Science ,Amines ,Diamond ,Quantum Physics (quant-ph) - Abstract
Nuclear magnetic resonance (NMR) imaging with shallow nitrogen-vacancy (NV) centers in diamond offers an exciting route toward sensitive and localized chemical characterization at the nanoscale. Remarkable progress has been made to combat the degradation in coherence time and stability suffered by near-surface NV centers using suitable chemical surface termination. However, approaches that also enable robust control over adsorbed molecule density, orientation, and binding configuration are needed. We demonstrate a diamond surface preparation for mixed nitrogen- and oxygen-termination that simultaneously improves NV center coherence times for emitters, 21 pages and 16 pages supporting information
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- 2022
33. Effects of high current density on the characteristics of zinc films electroplated in ethaline electrolyte
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Shubo Zhang, Fan Jiang, Yilong Kuang, Zhongjun Xie, Tianqi Zhu, Shaofu Li, and Chaoquan Hu
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Materials Chemistry ,Metals and Alloys ,Physical and Theoretical Chemistry ,Condensed Matter Physics - Abstract
Zinc coatings on Cu substrates were successfully electroplated from choline chloride (ChCl) with ethylene glycol (EG) based deep eutectic solvent with the current density varied from 10 to 40 mA cm−2 in air atmosphere at a temperature of 343 K. The effects of current density on the microstructure and corrosion performance were investigated in this paper. Smooth zinc coatings were obtained at the current density of 10 mA cm−2 with a current efficiency of over 90 %. With the increase in current density, there was a declining trend in the current efficiency and the surface quality of zinc coatings. Although there was no diffusion layer between the coating and substrates, all the zinc coatings still bonded well with the copper substrates. Compared with the smooth zinc coating electroplated at 10 mA cm−2, the zinc coating obtained at 40 mA cm−2 exhibited a better corrosion resistance in 3.5 wt.% NaCl aqueous solution due to the dense packing of the large number of flake zinc grains.
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- 2022
34. Severity assessment to guide empiric antibiotic therapy for cholangitis in children after Kasai portoenterostomy: a multicenter prospective randomized control trial in China.
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Pei Wang, Hong-yi Zhang, Jixin Yang, Tianqi Zhu, Xiaojuan Wu, Bin Yi, Xiaoyi Sun, Bin Wang, Tao Wang, Weibing Tang, Hua Xie, Jinfa Tou, Yijiang Han, Xiang Liu, Jianghua Zhan, Yuanmei Liu, Yingchao Li, Zhibao Lv, Li Lu, and Baohong Zhao
- Abstract
Background: Cholangitis is common in patients with biliary atresia following Kasai portoenterostomy (KPE). The prompt use of empiric antibiotics is essential due to the lack of identified microorganisms. The authors aimed to validate a severity grading system to guide empiric antibiotic therapy in the management of post-KPE cholangitis. Materials and methods: This multicenter, prospective, randomized, open-label study recruited patients with post-KPE cholangitis and was conducted from January 2018 to December 2019. On admission, patients were categorized into mild, moderate, and severe cholangitis according to the severity grading system. Patients in the mild cholangitis group were randomized to receive cefoperazone sodium tazobactam sodium (CSTS) or meropenem (MEPM). Patients with severe cholangitis were randomized to treatment with MEPM or a combination of MEPM plus immunoglobulin (MEPM +IVIG). Patients with moderate cholangitis received MEPM. Results: The primary endpoint was duration of fever (DOF). Secondary outcomes included blood culture, length of hospital stay, incidence of recurrent cholangitis, jaundice clearance rate, and native liver survival (NLS). For mild cholangitis, DOF, and length of hospital stay were similar between those treated with CSTS or MEPM (all P> 0.05). In addition, no significant difference in recurrence rate, jaundice clearance rate, and NLS was observed between patients treated with CSTS and MEPM at 1-month, 3-month, and 6-month follow-up. In patients with moderate cholangitis, the DOF was 36.00 (interquartile range: 24.00-48.00) h. In severe cholangitis, compared with MEPM, MEPM+IVIG decreased DOF and improved liver function by reducing alanine aminotransferase, aspartate aminotransferase, gamma-glutamyl transferase, and direct bilirubin at 1-month follow-up. However, recurrence rate, jaundice clearance rate, and NLS did not differ significantly between MEPM+ IVIG and MEPM at 1-month, 3-month, and 6-month follow-up. Conclusions: In patients with post-KPE cholangitis, MEPM is not superior to CSTS for the treatment of mild cholangitis. However, MEPM+ IVIG treatment was associated with better short-term clinical outcomes in patients with severe cholangitis. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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35. Estimation of species divergence times in presence of cross-species gene flow
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George P Tiley, Tomáš Flouri, Xiyun Jiao, Jelmer W Poelstra, Bo Xu, Tianqi Zhu, Bruce Rannala, Anne D Yoder, and Ziheng Yang
- Subjects
Genetics ,Ecology, Evolution, Behavior and Systematics - Abstract
Cross-species introgression can have significant impacts on phylogenomic reconstruction of species divergence events. Here, we used simulations to show how the presence of even a small amount of introgression can bias divergence time estimates when gene flow is ignored in the analysis. Using advances in analytical methods under the multispecies coalescent (MSC) model, we demonstrate that by accounting for incomplete lineage sorting and introgression using large phylogenomic data sets this problem can be avoided. The multispecies-coalescent-with-introgression (MSci) model is capable of accurately estimating both divergence times and ancestral effective population sizes, even when only a single diploid individual per species is sampled. We characterize some general expectations for biases in divergence time estimation under three different scenarios: 1) introgression between sister species, 2) introgression between non-sister species, and 3) introgression from an unsampled (i.e., ghost) outgroup lineage. We also conducted simulations under the isolation-with-migration (IM) model and found that the MSci model assuming episodic gene flow was able to accurately estimate species divergence times despite high levels of continuous gene flow. We estimated divergence times under the MSC and MSci models from two published empirical datasets with previous evidence of introgression, one of 372 target-enrichment loci from baobabs (Adansonia), and another of 1000 transcriptome loci from 14 species of the tomato relative, Jaltomata. The empirical analyses not only confirm our findings from simulations, demonstrating that the MSci model can reliably estimate divergence times but also show that divergence time estimation under the MSC can be robust to the presence of small amounts of introgression in empirical datasets with extensive taxon sampling. [divergence time; gene flow; hybridization; introgression; MSci model; multispecies coalescent]
- Published
- 2023
36. Influence of Dislocation Substructure on Size-Dependent Strength of High-Purity Aluminum Single-Crystal Micropillars.
- Author
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Naoki Takata, Shintaro Uesugi, Tianqi Zhu, Soichiro Takeyasu, Asuka Suzuki, and Makoto Kobashi
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ALUMINUM ,SHEARING force ,MODULUS of rigidity ,COLD rolling ,DISLOCATION density ,HIGH strength steel - Abstract
In order to understand the influence of dislocation substructures on the size-dependent strength (smaller is stronger) of micron-sized metals, we have fabricated single-crystal cylindrical micropillars with various diameters approximately ranging from 1 to 10 µm, which were prepared on the surface of the fully annealed sample and the subsequently cold-rolled samples of high-purity aluminum (Al). The annealed micropillars exhibited a size dependence of the resolved shear stress required for slip. The shear stress (,i) normalized by shear modulus (G) and the specimen diameter (d) normalized by Burgers vector (b) followed the correlation of ,i/G = 0.33(d/b)-0.63. The size-dependent strength was reduced by cold-rolling, resulting in lower power-law exponents (0.26-0.31) for the correlation in the cold-rolled specimens. The fine dislocation substructures introduced by the cold-rolling could be associated with the reduced size-dependent strength, which can be rationalized using the stochastic model of the dislocation source length in an assumption of homogenously distributed dislocations existing in the experimental micropillars. The inhomogeneous dislocation substructure with various dislocation cell sizes would contribute to a variation in the measured strength depending on the location, likely due to the probability of exiting the dislocation cell walls (local variation in dislocation density) in the micropillars fabricated on the cold-rolled Al samples. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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37. Study on Multi-Scale Failure Mechanism and Damage Evolution Constitutive Relation of Poly(Phthalazine Ether Sulfone Ketone) in a Wide Temperature Range
- Author
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Liangliang Shen, Xin Zhou, Tianqi Zhu, Chenglong Xiao, Gang Zhao, Xigao Jian, Jian Xu, and Zhiying Ren
- Published
- 2023
38. A CMOS Compatible Thermoelectric Device made of Crystalline Silicon Membranes with Nanopores
- Author
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Thierno-Moussa Bah, Stanislav Didenko, Di Zhou, Tianqi Zhu, Hafsa Ikzibane, Stephane Monfray, Thomas Skotnicki, Emmanuel Dubois, Jean-François Robillard, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Microélectronique Silicium - IEMN (MICROELEC SI - IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), STMicroelectronics [Crolles] (ST-CROLLES), This work has received: (i) funding from STMicroelectronics-IEMN common laboratory, (ii) funding from the European Research Council under the European Community’s Seventh Framework Programme (FP7/2007-2013) ERC Grant Agreement no. 338179, (iii) support from the French RENATECH network, (iv) support from the NANO2017 program, and (v) support from the French government through the National Research Agency (ANR) under program PIA EQUIPEX LEAF ANR-11-EQPX-0025 and project TIPTOP ANR-16-CE09-0023., Laboratoire commun STMicroelectronics-IEMN T4, Renatech Network, ANR-11-EQPX-0025,LEAF,Plateforme de traitement laser pour l'électronique flexible multifonctionnelle(2011), ANR-16-CE09-0023,TIPTOP,Pointes hautement sensibles pour la microscopie thermique à l'échelle nanométrique(2016), and European Project: 338179,EC:FP7:ERC,ERC-2013-StG,UPTEG(2013)
- Subjects
[SPI]Engineering Sciences [physics] ,Mechanics of Materials ,Mechanical Engineering ,General Materials Science ,Bioengineering ,General Chemistry ,Electrical and Electronic Engineering - Abstract
Herein, we report the use of nanostructured crystalline silicon as a thermoelectric material and its integration into thermoelectric devices. The proof-of-concept relies on the partial suppression of lattice thermal conduction by introducing pores with dimensions scaling between the electron mean free path and the phonon mean free path. In other words, we artificially aimed at the well-known ‘electron crystal and phonon glass’ trade-off targeted in thermoelectricity. The devices were fabricated using CMOS-compatible processes and exhibited power generation up to 5.5 mW cm−2 under a temperature difference of 280 K. These numbers demonstrate the capability to power autonomous devices with environmental heat sources using silicon chips of centimeter square dimensions. We also report the possibility of using the developed devices for integrated thermoelectric cooling.
- Published
- 2022
39. Isolation and identification of plant growth‐promoting rhizobacteria from tall fescue rhizosphere and their functions under salt stress
- Author
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Youyue Li, Xiangkai You, Zhe Tang, Tianqi Zhu, Bowen Liu, Mo‐Xian Chen, Yuefei Xu, and Tie‐Yuan Liu
- Subjects
Festuca ,Seedlings ,Physiology ,Rhizosphere ,Lolium ,Genetics ,Plant Development ,Bacillus ,Cell Biology ,Plant Science ,General Medicine ,Salt Stress ,Plant Roots - Abstract
Soil salinity has become one of the major factors that threaten tall fescue growth and turf quality. Plants recruit diverse microorganisms in the rhizosphere to cope with salinity stress. In this study, 15 plant growth-promoting rhizobacteria (PGPR) were isolated from the salt-treated rhizosphere of tall fescue and were annotated to 10 genera, including Agrobacterium, Fictibacillus, Rhizobium, Bhargavaea, Microbacterium, Paenarthrobacter, Pseudarthrobacter, Bacillus, Halomonas, and Paracoccus. All strains could produce indole-3-acetic acid (IAA). Additionally, eight strains exhibited the ability to solubilize phosphate and potassium. Most strains could grow on the medium containing 600 mM NaCl, such as Bacillus zanthoxyli and Bacillus altitudinis. Furthermore, Bacillus zanthoxyli and Bacillus altitudinis were inoculated with tall fescue seeds and seedlings to determine their growth-promoting effect. The results showed that Bacillus altitudinis and mixed culture significantly increased the germination rate of tall fescue seeds. Bacillus zanthoxyli can significantly increase the tillers number and leaf width of seedlings under salt conditions. Through the synergistic effect of FaSOS1, FaHKT1, and FaHAK1 genes, Bacillus zanthoxyli helps to expel the excess Na
- Published
- 2022
40. Screening of undernutrition in children with Hirschsprung disease using preoperative anthropometric parameters: A multicenter cross-sectional study
- Author
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Di Wang, Tianqi Zhu, Liye Zhu, Chunyi Ji, Bingyan Zhou, Guofeng Zhang, Qiang Yin, Heying Yang, and Jiexiong Feng
- Subjects
Nutrition and Dietetics ,Medicine (miscellaneous) - Abstract
The prevalence of malnutrition is unknown in patients with Hirschsprung disease. Undernutrition is associated with poor clinical outcomes. This study aims to describe the nutrition status among patients with Hirschsprung disease at admission.We retrospectively used data from children with Hirschsprung disease admitted to three pediatric surgery centers in China from January 2016 to December 2020. The weight-for-age z scores (WAZ), height-for-age z scores (HAZ), and body mass index-for-age z scores (BAZ) were calculated as the reference for nutrition risk according to the World Health Organization child growth standards. The nutrition status of enrolled children was described and nutrition risk in each clinical characteristic was compared. The association between nutrition status and clinical outcomes was analyzed using univariate and multivariate logistic regression.A total of 624 patients were included in this study. The mean WAZ, HAZ, and BAZ of all patients was -0.64 ± 1.40, -0.45 ± 1.78, and -0.43 ± 1.50, respectively. Moderate to severe overall undernutrition was 16.3% (102/624). We found that WAZ and BAZ were significantly reduced with the length of aganglionic segments (P = 0.001). Children who had a definitive surgery at 3 years of age or older had significantly lower HAZ (P = 0.001). A multivariate regression model assessing postoperative Hirschsprung-associated enterocolitis showed that the WAZ was one of the independent risk factors (P = 0.001).Undernutrition is prevalent among children with Hirschsprung disease. Nutrition assessment to identify individuals at risk of undernutrition for further intervention is necessary.
- Published
- 2022
41. 5-Aminolevulinic acid promotes low-light tolerance by regulating chloroplast ultrastructure, photosynthesis, and antioxidant capacity in tall fescue
- Author
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Si Long, Bowen Liu, Jiongjiong Gong, Ruijia Wang, Shuanghong Gao, Tianqi Zhu, Huan Guo, Tieyuan Liu, and Yuefei Xu
- Subjects
Chlorophyll ,Festuca ,Chloroplasts ,Glutathione Disulfide ,Physiology ,Ribulose-Bisphosphate Carboxylase ,Photosystem II Protein Complex ,Plant Science ,Aminolevulinic Acid ,Ascorbic Acid ,Hydrogen Peroxide ,Dehydroascorbic Acid ,Glutathione ,Antioxidants ,Seedlings ,Superoxides ,Malondialdehyde ,Genetics ,Photosynthesis ,Reactive Oxygen Species - Abstract
The vital signaling molecule 5-Aminolevulinic acid (ALA) plays critical roles in signal transduction and biological modulation under abiotic stresses. In this study, we explored the effects of exogenous ALA on low-light (LL) stress-induced photosynthesis and antioxidant system damage in tall fescue (Festuca arundinacea Schreb.) seedlings. LL stress decreased morphological index values and chlorophyll contents, while also reduced net photosynthetic rate (Pn) and the maximum quantum yield of photosystem II photochemistry (F
- Published
- 2022
42. Molecular sensing with single NV centers in diamond
- Author
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Erika Janitz, Abendroth, John M., Konstantin Herb, Tianqi Zhu, Laura Völker, and Degen, Christian L.
- Published
- 2022
43. Regression Model for China's Gold Futures Hedging Ratio and Function.
- Author
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Tianqi Zhu and Rongda Chen
- Published
- 2013
- Full Text
- View/download PDF
44. The absorption properties of one-dimensional spherical photonic crystals based on plasma material
- Author
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Tianqi Zhu, You Lv, Ziran Wang, and Haifeng Zhang
- Subjects
Condensed Matter Physics ,Mathematical Physics ,Atomic and Molecular Physics, and Optics - Abstract
The first theoretical treatment of the electromagnetic properties of one-dimensional plasma spherical photonic crystals (1D PSPCs) in the non-magnetized state is carried out to obtain the expressions for the electric and magnetic fields. The utilization of the transfer matrix method provides a new idea for the exploration of the 1D PSPCs, based on which the expressions for the absorptance of the 1D PSPCs are derived. A structure of quasi-periodic 1D PSPCs arranged according to the Thue-Morse sequence is proposed to acquire the ultra-wide absorption bands (ABs) at large incidence angles by adding an air layer and setting the plasma frequency in a gradient. And the factors affecting the ABs are meticulously analyzed. It is figured out that the primary factors affecting ABs are topology and plasma frequency, both of which have vigoroso influences on the bandwidths and positions of ABs. However, the initial radius and the collision frequency prevailingly affect the amplitude of the absorptance. The unexceptionable geometric properties of the 1D PSPCs make them sensitive to parameter changes and can be applied in the field of absorbers and radomes, which have great application prospects and development space.
- Published
- 2023
45. Complexity of the simplest species tree problem
- Author
-
Ziheng Yang and Tianqi Zhu
- Subjects
concatenation ,Concatenation ,Population ,Biology ,AcademicSubjects/SCI01180 ,species tree ,Coalescent theory ,MSC ,Statistics ,Methods ,Genetics ,Computer Simulation ,Divergence (statistics) ,education ,Molecular clock ,Molecular Biology ,Phylogeny ,Ecology, Evolution, Behavior and Systematics ,Probability ,Population Density ,education.field_of_study ,Models, Genetic ,AcademicSubjects/SCI01130 ,molecular clock ,multispecies coalescent ,Tree (data structure) ,Efficiency ,efficiency ,Identifiability - Abstract
The multispecies coalescent model provides a natural framework for species tree estimation accounting for gene-tree conflicts. Although a number of species tree methods under the multispecies coalescent have been suggested and evaluated using simulation, their statistical properties remain poorly understood. Here, we use mathematical analysis aided by computer simulation to examine the identifiability, consistency, and efficiency of different species tree methods in the case of three species and three sequences under the molecular clock. We consider four major species-tree methods including concatenation, two-step, independent-sites maximum likelihood, and maximum likelihood. We develop approximations that predict that the probit transform of the species tree estimation error decreases linearly with the square root of the number of loci. Even in this simplest case, major differences exist among the methods. Full-likelihood methods are considerably more efficient than summary methods such as concatenation and two-step. They also provide estimates of important parameters such as species divergence times and ancestral population sizes,whereas these parameters are not identifiable by summary methods. Our results highlight the need to improve the statistical efficiency of summary methods and the computational efficiency of full likelihood methods of species tree estimation.
- Published
- 2021
46. The expression of myeloperoxidase in thrombi is associated with reduced heme oxygenase‐1 induction and worse left ventricular remodeling in patients with acute <scp>ST</scp> ‐elevation myocardial infarction
- Author
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Ruiyan Zhang, Tianqi Zhu, Jun Ni, and Xibao Shi
- Subjects
medicine.medical_specialty ,medicine.medical_treatment ,Clinical Investigations ,acute myocardial infarction ,030204 cardiovascular system & hematology ,medicine.disease_cause ,Ventricular Function, Left ,03 medical and health sciences ,Percutaneous Coronary Intervention ,0302 clinical medicine ,heme oxygenase‐1 ,Internal medicine ,medicine ,Humans ,cardiovascular diseases ,030212 general & internal medicine ,Myocardial infarction ,Thrombus ,Ventricular remodeling ,Peroxidase ,Ejection fraction ,Ventricular Remodeling ,biology ,business.industry ,Percutaneous coronary intervention ,Stroke Volume ,Thrombosis ,General Medicine ,medicine.disease ,Vulnerable plaque ,myeloperoxidase ,Myeloperoxidase ,cardiovascular system ,biology.protein ,Cardiology ,ST Elevation Myocardial Infarction ,prognosis ,Cardiology and Cardiovascular Medicine ,business ,Heme Oxygenase-1 - Abstract
Background Myeloperoxidase (MPO) secreted by neutrophils is the enzyme that kills bacteria and other pathogens. Acute myocardial infarction (AMI) is usually caused by thrombosis in response to vulnerable plaque rupture. Circulating MPO was found to be associated with increased mortality in AMI patients. However, the relationship between MPO in thrombi and the prognosis of AMI patients remains unknown. Hypothesis MPO expression in thrombi is associated with the prognosis of patients who underwent primary percutaneous coronary intervention (PCI) after AMI. Methods This study included 41 consecutive patients with acute ST‐elevation myocardial infarction, who successfully underwent primary PCI, during which we collected thrombi remaining in the culprit artery using aspiration catheters. These thrombus samples were fixed, and immunohistochemical staining against MPO and heme oxygenase‐1 (HO‐1) was conducted. Enrolled patients were divided into two groups based on the induction of thrombotic MPO, which was quantified using Image J software. Methods We observed that increased MPO was associated with lower left ventricular ejection fraction (LVEF) and worse LV remodeling in AMI patients. Instead, patients with decreased thrombotic MPO induction had a considerable improvement in LVEF 1 month after discharge (54.4 ± 2.0% vs. 61.1 ± 2.3%, p
- Published
- 2021
47. Measurement and identification of relative poverty level of pastoral areas: an analysis based on spatial layout
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Haiying Lin, Youhan Gao, Tianqi Zhu, Huayuan Wu, Pengshen Hou, Wenlong Li, Shuxia Hou, and Muhammad Umer Arshad
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Rural Population ,China ,Health, Toxicology and Mutagenesis ,Quality of Life ,Environmental Chemistry ,Humans ,General Medicine ,Pollution ,Poverty - Abstract
Pastoral areas are the key difficulty in China’s pursuit of common prosperity and a key region for China to build the northern ecological safety barrier and to realize the Two Centenary Goals. It is of great significance to scientifically evaluate the quality of rural life (QRL), measure the relative poverty level (RPL), and identify the relatively poor areas, making it possible to dock poverty elimination with rural revitalization. Based on the socio-economic data of 18 pastoral areas in Inner Mongolia, this paper draws on spatial layout theory to evaluate QRL and measures RPL by the natural breakpoint method and then identifies the relatively poor areas in Inner Mongolia. The results show that (1) the QRLs of pastoral areas in Inner Mongolia were unbalanced and highly polarized. The mean score of QRLs was 0.2598. Eleven (61.11%) of the counties/banners had a QRL smaller than the mean score. On the spatial layout of QRLs, the western areas were stronger than the central areas. High QRL counties/banners are mainly concentrated in the western region. In the central region, the QRLs were very fragmented, falling onto all five levels. (2) The pastoral areas in Inner Mongolia differed significantly in RPL. The mean score of RPL stood at 0.3788. Nine counties/banners (50%) had an RPL greater than the mean. Contrary to the spatial layout features of QRLs, the central pastoral areas in Inner Mongolia had stronger RPLs than the eastern ones. High RPL counties/banners are mostly clustered in the central region. The spatial layout of RPLs is relatively reasonable in the central region: the RPLs decreased gradually from Dorbod Banner. (3) Nearly 45% of the pastoral areas in central and western Inner Mongolia face serious relative poverty and a high risk of returning to poverty. Eight counties/banners (45%) were identified as high composite relative poverty areas. From spatial layout, the composite relatively poor counties/banners clustered clearly, mainly in the western region. Finally, this paper establishes a warning mechanism against large-scale returning to poverty, aiming to lower composite RPL. The research results provide empirical reference and implementation path for consolidating the results of poverty eradication and facilitating rural revitalization.
- Published
- 2022
48. Inflammatory Myofibroblastic Tumor of the Sigmoid Colon in an Infant: A Case Report and Literature Review
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Luyao Wu, Xinyao Meng, Jing Wang, Qiong Wang, Xiaoyi Sun, Tianqi Zhu, Donghai Yu, and Jiexiong Feng
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Pediatrics, Perinatology and Child Health ,General Medicine ,Pathology and Forensic Medicine - Abstract
Inflammatory myofibroblastic tumor (IMT) infrequently involves the sigmoid colon, and has not previously been described in an infant sigmoid colon.An inflammatory myofibroblastic tumor arose from the sigmoid colon of an 11-month-old boy, confirmed by anaplastic lymphoma kinase (ALK), smooth muscle actin (SMA) and desmin immunohistochemical staining. The patient recovered well after complete resection of the tumor.Sigmoid IMT can occur in infancy. This eighth case is the youngest so far. The child did well after surgical resection.
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- 2022
49. Association between outpatient examinations and upgrading treatments for pediatric constipation
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Jixin Yang, Xiaoli Zhao, Tianqi Zhu, Hongyi Zhang, Xiaojuan Wu, Lei Xiang, Xiaoyi Sun, Mingfa Wei, Bin Yi, Guo Wang, and Jiexiong Feng
- Abstract
Purpose: This study aims to investigate risk factors of BE, ARM and acetylcholinesterase staining related to failure of treatments and diagnostic value of Hirschsprung’s disease (HSCR) or intractable constipation (IC). Methods: A single-center retrospective cohort study of children with constipation was conducted. All patients were followed up until significant improvement of defecation. Patients initially received general/conservative treatment or surgery. Upgraded treatments were adopted if the initial treatment failed. The risk factors including transitional zone, barium residue, absence of recto-anal inhibitory reflex (RAIR) and acetylcholinesterase staining. A p value Results: This study enrolled 4869 cases. Acetylcholinesterase staining +++ had the highest risk (OR, 177.613[95%CI 92.178~273.526]) leading to failure of general treatment, followed by absence of RAIR ((OR, 158.786[95%CI 92.178~273.526]) and severe barium residue (OR, 153.829[70.004~338.028]). The leading risk factors causing failure of conservative therapy were severe barium residue (OR, 15.530[95%CI 5.337~45.191]) and acetylcholinesterase staining +++ (OR, 13.242[6.657~26.337]). In children ≤3 years, the transitional zone, absence of RAIR and acetylcholinesterase staining ++/+++ had similar specificity (80.0%, 75.6% and 73.3%), whereas the acetylcholinesterase staining ++/+++ had the highest sensitivity (95.5%). The sensitivity was generally lower in children > 3 years, however the specificity was similar between each age group.Conclusion: This real-world study validates that the performance of 3 examinations is of great significance in guiding upgrading treatments, predicting clinical outcomes and identifying HSCR and IC.Trial Number: NCT02216994 (registered on October 27, 2014)
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- 2022
50. Predictive Value of 68Ga-FAPI-04 PET/MR for Left Ventricular Remodeling in Patients with Acute Myocardial Infarction
- Author
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Min Zhang, Weiwei Quan, Tianqi Zhu, Shuo Feng, Xinyun Huang, Hongping Meng, Run Du, Zhengbin Zhu, Xuezheng Qu, Ping Li, Xiaoxiang Yan, Ruiyan Zhang, and Biao Li
- Abstract
Purpose To observe longitudinal changes of myocardial fibroblasts activation by 68Ga-labeled fibroblast activation protein inhibitor (68Ga-FAPI-04) PET/MR in patients with ST-segment elevated myocardial infarction (STEMI), and assess its predictive value for late left ventricular remodeling (LVR). Methods Forty-two patients with STEMI were included in the study. 68Ga-FAPI-04 PET/MR was performed at baseline (5.1 ± 3.0 days) and at 12 months (12.0 ± 1.1 months) after STEMI. The extent of activated myocardial fibroblasts were quantified using 68Ga-FAPI-04 uptake volume (UV). Infarct size was expressed as late gadolinium enhancement (LGE) volume. LVR was defined as > 10% increase in left ventricular end-systolic volume (LVESV) from baseline to 12 months measured by echocardiography. Results Baseline 68Ga-FAPI-04 uptake volume (UV) was a significant predictor of the change in LVESV (B = 0.083, p = 0.023) from baseline to 12 months after AMI. The LVR group demonstrated higher 68Ga-FAPI-04 UV at baseline than the non-LVR group (p = 0.013). The area under the curve (AUC) of 68Ga-FAPI-04 UV at baseline for predicting the LVR reached 0.833 (p = 0.019), with sensitivity of 100.0% and specificity of 60.0%. Conclusion 68Ga-FAPI-04 PET/MR is a useful tool to non-invasively quantify myocardial fibroblasts activation, and baseline 68Ga-FAPI-04 UV in the early stage of STEMI may have predictive value for the late LVR.
- Published
- 2022
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