305 results on '"Zhiqi Chen"'
Search Results
2. The incentive effects of project governance elements on agents in agent-led construction of social security housing projects
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Zhiqi Chen, Liming Yao, Minghui Zheng, and Ling Zhang
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agent psychology ,behavioral incentive ,construction agent ,project governance elements ,security housing ,Management. Industrial management ,HD28-70 ,Finance ,HG1-9999 - Abstract
The agent-led construction system is a construction mode that emphasizes the introduction of professional management teams instead of government departments to develop public projects in China, including social security housing. In reality, the problem in practice is that the government owners’ management system of the agent market is not sound enough, and it cannot effectively motivate the agents. Existing research has not paid enough attention to this agent construction market. To reveal the effective incentives of agent developers, using the stimulus–organism–response theory, this study constructed a structural equation model and proposed a research hypothesis about the effect of project governance elements on project performance. The study found that governance elements including internal contractual governance, external contractual governance, and relational governance, had a positive incentivizing effect on the project performance. The psychology and behavior of the construction agent played a partial mediating role. The results provide a policy implication for city government to improve the incentive system for agent construction of security housing projects.
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- 2024
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3. The applicability of a commercial 3DO body scanner in measuring body composition in Chinese adults with overweight and obesity: a secondary analysis based on a weight-loss clinical trial
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Jialu Wang, Anqi Song, Molian Tang, Yi Xiang, Yiquan Zhou, Zhiqi Chen, David Heber, Qingya Tang, and Renying Xu
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Three-dimensional optical (3DO) ,bioelectrical impedance analysis (BIA) ,body composition ,Nutrition. Foods and food supply ,TX341-641 ,Sports medicine ,RC1200-1245 - Abstract
ABSTRACTBackground A commercial three-dimensional optical (3DO) scanning system was reported to be used in body composition assessment. However, the applicability in Chinese adults has yet to be well-studied.Methods This secondary analysis was based on a 16-week weight-loss clinical trial with an optional extension to 24 weeks. Waist and hip circumference and body composition were measured by 3DO scanning at each follow-up visit during the study. Bioelectrical impedance analysis (BIA) was also performed to confirm the reliability of 3DO scanning at each visit. We used Lin’s concordance correlation coefficients (CCC) to evaluate the correlation between the two methods above-mentioned. Bland-Altman analysis was also performed to evaluate the agreement and potential bias between different methods.Results A total number of 70 Chinese adults overweight and obese (23 men and 47 women, aged 31.8 ± 5.8 years) were included in the analysis, which resulted in 350 3DO scans and corresponding 350 BIA measurements. The percent body fat, fat mass, and fat-free mass were 33.9 ± 5.4%, 26.7 ± 4.6 kg, and 50.3 ± 8.7 kg before the trial by 3DO scanning. And they were 30.5 ± 5.8%, 22.5 ± 4.7 kg, and 49.4 ± 8.3 kg after 16 weeks of the trial. Compared with BIA, 3DO scanning performed best in the assessment of fat-free mass (CCC = 0.89, 95%CI: 0.86, 0.90), then followed by fat mass (CCC = 0.76, 95%CI: 0.71, 0.80) and percent body fat (CCC = 0.70, 95%CI: 0.64, 0.75). Subgroup analysis showed that 3DO scanning and BIA correlated better in women than that in men, and correlated better in measuring fat-free mass in participants with larger body weight (BMI ≥28.0 kg/m2) than those with smaller body weight (
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- 2024
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4. Turning sublimed sulfur and bFGF into a nanocomposite to accelerate wound healing via co-activate FGFR and Hippo signaling pathway
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Jieqiong Cao, Zijian Su, Yibo Zhang, Zhiqi Chen, Jingsheng Li, Yulin Cai, Yiming Chang, Minghua Lei, Qianyi He, Weicai Li, Xuan Liao, Shuixing Zhang, An Hong, and Xiaojia Chen
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Nanocomposite ,Diabetic wound healing ,FGFR pathway ,Hippo pathway ,Medicine (General) ,R5-920 ,Biology (General) ,QH301-705.5 - Abstract
Clinical treatment of diabetic refractory ulcers is impeded by chronic inflammation and cell dysfunction associated with wound healing. The significant clinical application of bFGF in wound healing is limited by its instability in vivo. Sulfur has been applied for the treatment of skin diseases in the clinic for antibiosis. We previously found that sulfur incorporation improves the ability of selenium nanoparticles to accelerate wound healing, yet the toxicity of selenium still poses a risk for its clinical application. To obtain materials with high pro-regeneration activity and low toxicity, we explored the mechanism by which selenium-sulfur nanoparticles aid in wound healing via RNA-Seq and designed a nanoparticle called Nano-S@bFGF, which was constructed from sulfur and bFGF. As expected, Nano-S@bFGF not only regenerated zebrafish tail fins and promoted skin wound healing but also promoted skin repair in diabetic mice with a profitable safety profile. Mechanistically, Nano-S@bFGF successfully coactivated the FGFR and Hippo signalling pathways to regulate wound healing. Briefly, the Nano-S@bFGF reported here provides an efficient and feasible method for the synthesis of bioactive nanosulfur and bFGF. In the long term, our results reinvigorated efforts to discover more peculiar unique biofunctions of sulfur and bFGF in a great variety of human diseases.
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- 2024
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5. On a conjecture on transposed Poisson n-Lie algebras
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Junyuan Huang, Xueqing Chen, Zhiqi Chen, and Ming Ding
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lie algebra ,poisson algebra ,transposed poisson algebra ,$ n $-lie algebra ,transposed poisson $ n $-lie algebra ,Mathematics ,QA1-939 - Abstract
The notion of a transposed Poisson $ n $-Lie algebra has been developed as a natural generalization of a transposed Poisson algebra. It was conjectured that a transposed Poisson $ n $-Lie algebra with a derivation gives rise to a transposed Poisson $ (n+1) $-Lie algebra. In this paper, we focus on transposed Poisson $ n $-Lie algebras. We have obtained a rich family of identities for these algebras. As an application of these formulas, we provide a construction of $ (n+1) $-Lie algebras from transposed Poisson $ n $-Lie algebras with derivations under a certain strong condition, and we prove the conjecture in these cases.
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- 2024
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6. Myricetin reduces neutrophil extracellular trap release in a rat model of rheumatoid arthritis, which is associated with a decrease in disease severity
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Yiqin Shu, Rui Yang, Huijie Wen, Qiannan Dong, Zhiqi Chen, Yang Xiang, and Hao Wu
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Immunologic diseases. Allergy ,RC581-607 - Abstract
Rheumatoid arthritis (RA) is a chronic disease characterized by joint inflammation and severe disability. However, there is a lack of safe and effective drugs for treating RA. In our previous study, we discovered that myricetin (MC) and celecoxib have a synergistic effect in the treatment of RA. We conducted in vitro and in vivo experiments to further investigate the effects and mechanisms of action of MC. Our findings demonstrated that MC treatment effectively reduced the release of neutrophil extracellular traps (NETs) and alleviated the inflammatory response in RA. Mechanistic studies showed that MC prevents the entry of PADI4 and MPO into the cell nucleus, thereby protecting DNA from decondensation. In a rat arthritis model, MC improved histological changes in ankle joints and suppressed NET-related signaling factors. In conclusion, MC protects the ankle joints against arthritis by inhibiting MPO and PADI4, thereby reducing NET release. The pharmacological mechanism of MC in RA involves the inhibition of NET release.
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- 2024
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7. Multiscale Structural Design of 2D Nanomaterials‐based Flexible Electrodes for Wearable Energy Storage Applications
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Yunfeng Chao, Yan Han, Zhiqi Chen, Dewei Chu, Qun Xu, Gordon Wallace, and Caiyun Wang
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2D Materials ,energy storage devices ,flexible electrodes ,multiscale design strategies ,Science - Abstract
Abstract 2D nanomaterials play a critical role in realizing high‐performance flexible electrodes for wearable energy storge devices, owing to their merits of large surface area, high conductivity and high strength. The electrode is a complex system and the performance is determined by multiple and interrelated factors including the intrinsic properties of materials and the structures at different scales from macroscale to atomic scale. Multiscale design strategies have been developed to engineer the structures to exploit full potential and mitigate drawbacks of 2D materials. Analyzing the design strategies and understanding the working mechanisms are essential to facilitate the integration and harvest the synergistic effects. This review summarizes the multiscale design strategies from macroscale down to micro/nano‐scale structures and atomic‐scale structures for developing 2D nanomaterials‐based flexible electrodes. It starts with brief introduction of 2D nanomaterials, followed by analysis of structural design strategies at different scales focusing on the elucidation of structure‐property relationship, and ends with the presentation of challenges and future prospects. This review highlights the importance of integrating multiscale design strategies. Finding from this review may deepen the understanding of electrode performance and provide valuable guidelines for designing 2D nanomaterials‐based flexible electrodes.
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- 2024
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8. The Association between Serum Level of Vitamin D and Inflammatory Biomarkers in Hospitalized Adult Patients: A Cross-Sectional Study Based on Real-World Data
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Xiaomin Zhang, Zhiqi Chen, Yi Xiang, Yiquan Zhou, Molian Tang, Jun Cai, Xinyi Xu, Hongyuan Cui, Yi Feng, and Renying Xu
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Pathology ,RB1-214 - Abstract
Objective. The association between vitamin D status and inflammation remains unclear in hospitalized patients. Materials and Methods. We performed the current study based on real-world data from two teaching hospitals. Serum level of vitamin D (assessed by 25-hydroxyvitamin D) was evaluated within 2 days after admission. All the patients were further classified into three groups: deficiency (
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- 2024
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9. The Most Popular Commercial Weight Management Apps in the Chinese App Store: Analysis of Quality, Features, and Behavior Change Techniques
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Lan Geng, Genyan Jiang, Lingling Yu, Yueming Xu, Wei Huang, Zhiqi Chen, Xiaoyan Qi, Ting Zhang, and Mei Zhao
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Information technology ,T58.5-58.64 ,Public aspects of medicine ,RA1-1270 - Abstract
BackgroundMany smartphone apps designed to assist individuals in managing their weight are accessible, but the assessment of app quality and features has predominantly taken place in Western countries. Nevertheless, there is a scarcity of research evaluating weight management apps in China, which highlights the need for further investigation in this area. ObjectiveThis study aims to conduct a comprehensive search for the most popular commercial Chinese smartphone apps focused on weight management and assess their quality, behavior change techniques (BCTs), and content-related features using appropriate evaluation scales. Additionally, the study sought to investigate the associations between the quality of various domains within weight management apps and the number of incorporated BCTs and app features. MethodsIn April 2023, data on weight management apps from the iOS and Android app stores were downloaded from the Qimai Data platform. Subsequently, a total of 35 weight management apps were subjected to screening and analysis by 2 researchers. The features and quality of the apps were independently assessed by 6 professionals specializing in nutrition management and health behavioral change using the Mobile Application Rating Scale (MARS). Two registered dietitians, who had experience in app development and coding BCTs, applied the established 26-item BCT taxonomy to verify the presence of BCTs. Mean (SD) scores and their distributions were calculated for each section and item. Spearman correlations were used to assess the relationship between an app’s quality and its technical features, as well as the number of incorporated BCTs. ResultsThe data set included a total of 35 apps, with 8 available in the Android Store, 10 in the Apple Store, and 17 in both. The overall quality, with a mean MARS score of 3.44 (SD 0.44), showed that functionality was the highest scoring domain (mean 4.18, SD 0.37), followed by aesthetics (mean 3.43, SD 0.42), engagement (mean 3.26, SD 0.64), and information (mean 2.91, SD 0.52), which had the lowest score. The mean number of BCTs in the analyzed apps was 9.17 (range 2-18 BCTs/app). The most common BCTs were “prompt review of behavioral goals” and “provide instruction,” present in 31 apps (89%). This was followed by “prompt self-monitoring of behavior” in 30 apps (86%), “prompt specific goal setting” in 29 apps (83%), and “provide feedback on performance” in 27 apps (77%). The most prevalent features in the analyzed apps were the need for web access (35/35, 100%), monitoring/tracking (30/35, 86%), goal setting (29/35, 83%), and sending alerts (28/35, 80%). The study also revealed strong positive correlations among the number of BCTs incorporated, app quality, and app features. This suggests that apps with a higher number of BCTs tend to have better overall quality and more features. ConclusionsThe study found that the overall quality of weight management apps in China is moderate, with a particular weakness in the quality of information provided. The most prevalent BCTs in these apps were reviewing behavioral goals, providing guidance, self-monitoring of behavior, goal setting, and offering performance feedback. The most common features were the need for web access, monitoring and tracking, goal setting, and sending alerts. Notably, higher-quality weight management apps in China tended to incorporate more BCTs and features. These findings can be valuable for developers looking to improve weight management apps and enhance their potential to drive behavioral change in weight management.
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- 2023
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10. Polyethylene Oxide (PEO) Provides Bridges to Silica Nanoparticles to Form a Shear Thickening Electrolyte for High Performance Impact Resistant Lithium‐ion Batteries
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Zhiqi Chen, Yunfeng Chao, Sepidar Sayyar, Tongfei Tian, Kezhong Wang, Yeqing Xu, Gordon Wallace, Jie Ding, and Caiyun Wang
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impact tolerance ,lithium‐ion batteries ,polymer bridging ,safety ,shear thickening electrolytes ,Science - Abstract
Abstract The development of shear thickening electrolytes is proving to be pivotal in the quest for impact resistant lithium‐ion batteries (LIBs). However, the high viscosity and poor stability associated with the need for high filler content has to date impeded progress. Here, this work reports a new type of polymer‐bridged shear thickening electrolyte that overcomes these shortcomings, by utilizing the interaction between polymer chains and silica nanoparticles. The incorporation of polyethylene oxide (PEO) facilitates hydrocluster formation providing impact resistance with a filler content as low as 2.2 wt%. This low viscosity electrolyte has a high ionic conductivity of ≈5.1 mS cm−1 with excellent long‐term stability, over 30 days. The effectiveness of this electrolyte in LIBs is demonstrated by excellent electrochemical performance and high impact resistance.
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- 2023
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11. Subsidy and product diversity in the presence of buyer power
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Zhiqi Chen and Hong Ding
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Finance ,HG1-9999 ,Regional economics. Space in economics ,HT388 - Abstract
Abstract This paper analyzes the effectiveness of government subsidies in promoting product diversity when a downstream firm has buyer power. Using an extension of the Dixit‐Stiglitz model of monopolistic competition, we compare the effects of subsidies on the equilibrium number of differentiated products and social welfare in the case where products are sold directly to consumers versus the case where they are distributed through a monopoly retailer with buyer power. We find that a production subsidy promotes product diversity in both cases, but the mechanisms through which a subsidy raises the number of products are different. Compared with the case where products are distributed directly to consumers, retailer buyer power reduces product diversity and social welfare. Furthermore, it weakens the effectiveness of the subsidy in promoting product diversity. At any given subsidy rate the equilibrium number of products is smaller, and a rise in the subsidy rate leads to a smaller increase in the number of products.
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- 2022
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12. MiR-30 promotes fatty acid beta-oxidation and endothelial cell dysfunction and is a circulating biomarker of coronary microvascular dysfunction in pre-clinical models of diabetes
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Shawn Veitch, Makon-Sébastien Njock, Mark Chandy, M. Ahsan Siraj, Lijun Chi, HaoQi Mak, Kai Yu, Kumaragurubaran Rathnakumar, Carmina Anjelica Perez-Romero, Zhiqi Chen, Faisal J. Alibhai, Dakota Gustafson, Sneha Raju, Ruilin Wu, Dorrin Zarrin Khat, Yaxu Wang, Amalia Caballero, Patrick Meagher, Edward Lau, Lejla Pepic, Henry S. Cheng, Natalie J. Galant, Kathryn L. Howe, Ren-Ke Li, Kim A. Connelly, Mansoor Husain, Paul Delgado-Olguin, and Jason E. Fish
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Endothelial cell ,Microvasculature ,Diabetes ,Extracellular vesicle ,microRNA ,Biomarker ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Abstract Background Type 2 diabetes (T2D) is associated with coronary microvascular dysfunction, which is thought to contribute to compromised diastolic function, ultimately culminating in heart failure with preserved ejection fraction (HFpEF). The molecular mechanisms remain incompletely understood, and no early diagnostics are available. We sought to gain insight into biomarkers and potential mechanisms of microvascular dysfunction in obese mouse (db/db) and lean rat (Goto-Kakizaki) pre-clinical models of T2D-associated diastolic dysfunction. Methods The microRNA (miRNA) content of circulating extracellular vesicles (EVs) was assessed in T2D models to identify biomarkers of coronary microvascular dysfunction/rarefaction. The potential source of circulating EV-encapsulated miRNAs was determined, and the mechanisms of induction and the function of candidate miRNAs were assessed in endothelial cells (ECs). Results We found an increase in miR-30d-5p and miR-30e-5p in circulating EVs that coincided with indices of coronary microvascular EC dysfunction (i.e., markers of oxidative stress, DNA damage/senescence) and rarefaction, and preceded echocardiographic evidence of diastolic dysfunction. These miRNAs may serve as biomarkers of coronary microvascular dysfunction as they are upregulated in ECs of the left ventricle of the heart, but not other organs, in db/db mice. Furthermore, the miR-30 family is secreted in EVs from senescent ECs in culture, and ECs with senescent-like characteristics are present in the db/db heart. Assessment of miR-30 target pathways revealed a network of genes involved in fatty acid biosynthesis and metabolism. Over-expression of miR-30e in cultured ECs increased fatty acid β-oxidation and the production of reactive oxygen species and lipid peroxidation, while inhibiting the miR-30 family decreased fatty acid β-oxidation. Additionally, miR-30e over-expression synergized with fatty acid exposure to down-regulate the expression of eNOS, a key regulator of microvascular and cardiomyocyte function. Finally, knock-down of the miR-30 family in db/db mice decreased markers of oxidative stress and DNA damage/senescence in the microvascular endothelium. Conclusions MiR-30d/e represent early biomarkers and potential therapeutic targets that are indicative of the development of diastolic dysfunction and may reflect altered EC fatty acid metabolism and microvascular dysfunction in the diabetic heart.
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- 2022
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13. Analysis of risk factors and construction of a prediction model for short stature in children
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Shaojun Huang, Zhiqi Chen, Rongping Chen, Zhen Zhang, Jia Sun, and Hong Chen
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short stature ,children ,risk factors ,nomogram prediction model ,risk classification system ,Pediatrics ,RJ1-570 - Abstract
BackgroundShort stature in children is an important global health issue. This study aimed to analyze the risk factors associated with short stature and to construct a clinical prediction model and risk classification system for short stature.MethodsThis cross-sectional study included 12,504 children aged 6–14 years of age from 13 primary and secondary schools in Pingshan District, Shenzhen. A physical examination was performed to measure the height and weight of the children. Questionnaires were used to obtain information about children and their parents, including sex, age, family environment, social environment, maternal conditions during pregnancy, birth and feeding, and lifestyle. The age confounding variable was adjusted through a 1 : 1 propensity score matching (PSM) analysis and 1,076 children were selected for risk factor analysis.ResultsThe prevalence of short stature in children aged 6–14 years was 4.3% in the Pingshan District, Shenzhen. The multivariate logistic regression model showed that the influencing factors for short stature were father's height, mother's height, annual family income, father's level of education and parents’ concern for their children's height in the future (P
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- 2022
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14. Quality Assessment of the Clinical Practice Guidelines of Ostomy Care Based on the AGREE II Instrument
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Xiaoyu Li, Qiao Yuan, Liangrong Geng, Zhiqi Chen, Rui Zhang, Liqun Guo, and Shujin Yue
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ostomy ,guidelines ,evidence ,quality assessment ,AGREE II ,Public aspects of medicine ,RA1-1270 - Abstract
ObjectivesTo assess the quality of clinical practice guidelines (CPGs) of ostomy care, and to analyze the status quo and challenges of guideline development.MethodsCPGs of ostomy care were systematically searched in relevant guideline websites and electronic databases, including PubMed, ProQuest, Web of Science, CNKI, VIP, WANFANG, and SinoMed, from January 1, 2012, to November 24, 2021. Two appraisers used the Appraisal of Guidelines for Research and Evaluation, 2nd edition (AGREE II) instrument to assess the quality of the included CPGs independently and objectively. The consistency of assessment was calculated using intraclass correlation coefficients (ICC).ResultsA total of 5 CPGs relevant to ostomy care were assessed by AGREE II and the general quality of them was good. There were two CPGs of grade A and three CPGs of grade B. The domain scope and purpose (87.78%) had the highest scores, followed by the clarity of presentation (87.22%), the rigor of development (69.17%), stakeholder involvement (68.33%), and editorial independence (65.00%), and the lowest was applicability (55.42%). The overall assessment score was 5.40. All the ICCs for the AGREE II appraisal conducted by the two appraisers were >0.75.ConclusionsThe five CPGs of ostomy care have the potential to be adopted in clinical practice. However, they still have some room for improvement, especially in the applicability domain. The development of ostomy care CPGs should follow the evidence-based progress and methodology of guideline formulation specifications while considering the effects of the CPGs and the practical issues.
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- 2022
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15. Secular Difference in Body Mass Index From 2014 to 2020 in Chinese Older Adults: A Time-Series Cross-Sectional Study
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Ying Jiang, Xiaomin Zhang, Tianwei Xu, Weiqi Hong, Zhiqi Chen, Xiang Gao, and Renying Xu
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body mass index (BMI) ,the elderly ,underweight ,overweight ,obesity ,Nutrition. Foods and food supply ,TX341-641 - Abstract
BackgroundBody mass index (BMI) is the most widely used parameter to assess the body weight status. Both the increase of BMI (overweight and obesity) and decrease of BMI (underweight) has been associated with high risk of adverse outcome, such as stroke, disability, and even death. However, recent data on secular differences in BMI in the Chinese aged population are limited. The present study provides robust new evidence about the evolving epidemic of obesity among aged adults in China.ObjectiveEvaluating secular difference in BMI in a group of Chinese older adults.Materials and MethodsWe analyzed 7 continuous survey years (2014–2020), including 50,192 Chinese aged participants (25,505 men and 24,687 women, aged 71.9 ± 6.1 years, age range: 65–99 years). Information on sex, age, height, and body weight, was collected based on medical history. Participants were classified into four groups: underweight (BMI < 18.5 kg/m2), normal weight (18.5 kg/m2 ≤ BMI < 25 kg/m2), overweight (25 kg/m2 ≤ BMI < 30 kg/m2), and obesity (BMI ≥ 30 kg/m2). Linear regressions were used to assess the secular difference in BMI. Sex and age differences were also evaluated by stratified analyses.ResultsFrom 2014 to 2020, age-adjusted mean BMI increased by 0.3 kg/m2 (95% CI: 0.1, 0.5 kg/m2) in men, and 0.5 kg/m2 (95% CI: 0.2, 0.7 kg/m2) in women. Age-standardized prevalence of underweight decreased from 3.0 to 2.3% in men, and from 3.0 to 2.1% in women. Age-standardized prevalence of overweight increased in both men (from 40.1 to 41.7%) and women (from 37.8 to 39.8%), and so as obesity (men: from 4.1 to 6.1%; women: from 5.8 to 8.7%).ConclusionOur results confirmed that BMI gradually increased from 2014 to 2020. The age-adjusted mean BMI increased by 0.3 kg/m2 in older men, and 0.5 kg/m2 in older women. The age- and sex-standardized prevalence of overweight and obesity significantly increased, especially in 70–79-year age group, while the prevalence of underweight decreased. The combination of a balanced-diet and physical exercise is needed to maintain optimal BMI range for the aged population.
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- 2022
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16. Quantitative analysis of internal components of the human crystalline lens during accommodation in adults
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Yan Xiang, Ting Fu, Qiongfang Xu, Wei Chen, Zhiqi Chen, Jinming Guo, Chaohua Deng, Anne Manyande, Ping Wang, Hong Zhang, Xuebi Tian, and Junming Wang
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Medicine ,Science - Abstract
Abstract To quantitatively analyze changes in the inner components of the human crystalline lens during accommodation in adults. Eyes of 23 subjects were sequentially examined using CASIA2 Optical Coherence Tomography under 0D, − 3D and − 6D accommodation states. The anterior chamber depth (ACD), anterior and posterior crystalline lens radius of the curvature (ALRC and PLRC) were obtained using built-in software. The lens thickness (LT), lenticular nucleus thickness (NT), anterior cortex thickness (ACT), posterior cortex thickness (PCT), anterior and posterior lenticular nucleus radius of the curvature (ANRC and PNRC), anterior and posterior lenticular nucleus vertex (ANV and PNV) were quantified manually with the Image-pro plus software. During accommodation, the ACD became significantly shallower and LT significantly increased. For changes in the lens, the ALRC decreased by an average magnitude (related to accommodative stimuli) 0.44 mm/D, and PLRC decreased 0.09 mm/D. There was no difference for the ACT and PCT in different accommodation states. For lenticular nucleus response, NT increased on average by 30 μm/D. Both the ANRC and PNRC decreased on average by 212 μm/D and 115 μm/D respectively. The ANV moved forward on average by 0.07 mm under − 3D accommodative stimuli and 0.16 mm for − 6D. However, there was no statistically significant difference between different accommodation states in the PNV movement. Under accommodation stimulation, lens thickness changed mainly due to the lenticular nucleus, but not the cortex. For the lenticular nucleus, both the ANRC and PNRC decreased and ANRC changed the most. The anterior surface of the nucleus moved forward while the posterior surface of the nucleus moved backward but only slightly.
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- 2021
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17. Inhibition of FGFR2 Signaling by Cynaroside Attenuates Liver Fibrosis
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Qilin Meng, Lin Luo, Minghua Lei, Zhiqi Chen, Yuanmeng Sun, Xue Chen, Zhaodong Zhai, Yibo Zhang, Jieqiong Cao, Zijian Su, Fu Li, Jingsheng Li, An Hong, and Xiaojia Chen
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liver fibrosis ,collagen accumulation ,FGFR2 ,cynaroside ,hepatic stellate cells ,Medicine ,Pharmacy and materia medica ,RS1-441 - Abstract
Liver fibrosis represents a significant health hazard with a high morbidity rate and an increased risk of liver cancer. Targeting overactivated Fibroblast growth factor receptor 2 (FGFR2) is a promising strategy to counteract collagen accumulation during liver fibrosis. However, there is a shortage of drugs to specifically block the activation of FGFR2 in liver fibrosis patients. Data mining, cell validation, and animal studies showed a positive correlation between FGFR2 overexpression and liver fibrosis development. Novel FGFR2 inhibitors were screened using a microarray-based high-throughput binding analysis. The effectiveness of each candidate was validated through simulated docking, binding affinity verification, single-point mutation validation, and in vitro kinase inhibition measurements to demonstrate the ability of each inhibitor to block the catalytic pocket and reverse FGFR2 overactivation. A specific FGFR2 inhibitor, cynaroside (CYN, also known as luteoloside), was screened based on the finding that FGFR2 promotes hepatic stellate cell (HSC) activation and collagen secretion in hepatocytes. The results from cellular assays showed that CYN can inhibit FGFR2 hyperactivation resulting from its overexpression and excessive basic fibroblast growth factor (bFGF), reducing HSC activation and collagen secretion in hepatocytes. Animal experiments on a carbon tetrachloride (CCl4) mouse model and a nonalcoholic steatohepatitis mouse model indicate that CYN treatment reduces liver fibrosis during fibrosis formation. These findings suggest that CYN prevents liver fibrosis formation at the cell level and in mouse models.
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- 2023
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18. PDWN: Pyramid Deformable Warping Network for Video Interpolation
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Zhiqi Chen, Ran Wang, Haojie Liu, and Yao Wang
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Video interpolation ,deformable convolution ,deep learning ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
Video interpolation aims to generate a non-existent intermediate frame given the past and future frames. Many state-of-the-art methods achieve promising results by estimating the optical flow between the known frames and then generating the backward flows between the middle frame and the known frames. However, these methods usually suffer from the inaccuracy of estimated optical flows and require additional models or information to compensate for flow estimation errors. Following the recent development in using deformable convolution (DConv) for video interpolation, we propose a light but effective model, called Pyramid Deformable Warping Network (PDWN). PDWN uses a pyramid structure to generate DConv offsets of the unknown middle frame with respect to the known frames through coarse-to-fine successive refinements. Cost volumes between warped features are calculated at every pyramid level to help the offset inference. At the finest scale, the two warped frames are adaptively blended to generate the middle frame. Lastly, a context enhancement network further enhances the contextual detail of the final output. Ablation studies demonstrate the effectiveness of the coarse-to-fine offset refinement, cost volumes, and DConv. Our method achieves better or on-par accuracy compared to state-of-the-art models on multiple datasets while the number of model parameters and the inference time are substantially less than previous models. Moreover, we present an extension of the proposed framework to use four input frames, which can achieve significant improvement over using only two input frames, with only a slight increase in the model size and inference time.
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- 2021
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19. Dual effect of the Valsalva maneuver on autonomic nervous system activity, intraocular pressure, Schlemm’s canal, and iridocorneal angle morphology
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Li Sun, Wei Chen, Zhiqi Chen, Yan Xiang, Jingmin Guo, Tian Hu, Qiongfang Xu, Hong Zhang, and Junming Wang
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The Valsalva maneuver ,Schlemm’s canal ,Intraocular pressure ,Autonomic nervous system ,Iridocorneal angle morphology ,Ophthalmology ,RE1-994 - Abstract
Abstract Background The Valsalva maneuver (VM) is widely used in daily life, and has been reported to cause high intraocular pressure (IOP). This study aimed to assess changes in IOP, the Schlemm’s canal (SC), autonomic nervous system activity, and iridocorneal angle morphology in healthy individuals during different phases of the VM. Methods The high frequency (HF) of heart rate (HR) variability, the ratio of low frequency power (LF) and HF (LF/HF), heart rate (HR), IOP, systolic (SBP) and diastolic blood pressure (DBP), the area of SC (SCAR), pupil diameter (PD), and some iridocorneal angle parameters (AOD500, ARA750, TIA500 and TISA500) were measured in 29 young healthy individuals at baseline, phase 2, and phase 4 of the VM. SBP and DBP were measured to calculate mean arterial pressure (MAP) and mean ocular perfusion pressure (MOPP). HF and the LF/HF ratio were recorded using Kubios HR variability premium software to evaluate autonomic nervous system activity. The profiles of the anterior chamber were captured by a Spectralis optical coherence tomography device (anterior segment module). Results Compared with baseline values, in phase 2 of the VM, HR, LF/HF, IOP (15.1 ± 2.7 vs. 18.8 ± 3.5 mmHg, P
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- 2020
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20. Abuse‐Tolerant Electrolytes for Lithium‐Ion Batteries
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Zhiqi Chen, Yunfeng Chao, Weihua Li, Gordon G. Wallace, Tim Bussell, Jie Ding, and Caiyun Wang
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electrolytes ,flame retardants ,lithium‐ion batteries ,redox shuttles ,shear thickening ,Science - Abstract
Abstract Safety issues currently limit the development of advanced lithium‐ion batteries (LIBs) and this is exacerbated when they are misused or abused. The addition of small amounts of fillers or additives into common liquid electrolytes can greatly improve resistance to abuse without impairing electrochemical performance. This review discusses the recent progress in such abuse‐tolerant electrolytes. It covers electrolytes with shear thickening properties for tolerating mechanical abuse, electrolytes with redox shuttle additives for suppressing electrochemical abuse, and electrolytes with flame‐retardant additives for resisting thermal abuse. It aims to provide insights into the functioning of such electrolytes and the understanding of electrolyte composition‐property relationship. Future perspectives, challenges, and opportunities towards practical applications are also presented.
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- 2021
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21. Prevalence and prognostic value of FBXO11 expression in patients with clear cell renal cell carcinoma
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Bo Fan, Wei Wang, Xianping Zhang, Min Sun, Xiaogang Wang, Zhiqi Chen, Wankai Liu, Qun Wang, Na Yu, and Xiancheng Li
- Subjects
FBXO11 ,Renal cell carcinoma ,Prognosis ,Nomogram ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Abstract Background FBXO11, a member of the F-box protein family, regulates the cell-cycle by promoting the degradation of Bcl-6 and p53. This protein has been implicated in the progression of several cancers, including renal cell carcinoma (RCC). The aim of this study was to determine the prognostic role of FBXO11 in the clinical outcome of RCC patients. Methods FBXO11 mRNA expression was analysed in normal and RCC tissue microarrays of the Oncomine database. In addition, the in situ expression levels of stromal FBXO11 protein were assessed in primary RCC tissues from 227 patients (training and validation cohorts) using immunohistochemistry (IHC). Kaplan Meier and Cox regression analyses were used to determine the association between FBXO11 expression and cliniopathological factors. A nomogram was established using the significant prognostic factors to predict overall survival (OS) of RCC patients after one, three and 5 years. Results In the Oncomine database, FBXO11 mRNA levels were lower in normal tissues than in cancer tissues, including clear cell renal cell carcinoma (ccRCC), papillary renal cell carcinoma (pRCC), hereditary ccRCC, non-hereditary ccRCC, VHL mutant ccRCC and VHL wild-type ccRCC. In addition, FBXO11 expression was also significantly higher in metastatic kidney cancer than in primary cancer. Immunohistochemical analysis reported that 57.3% (86 of 150) of the training cohort and 57.1% (44 of 77) of the validation cohort were scored as having high FBXO11 staining density. FBXO11 expression was significantly associated with Fuhrman grade (p = 0.003), UISS score (p = 0.021) and age (p = 0.048) in the training cohort. Furthermore, Kaplan-Meier survival analysis showed that higher FBXO11 levels, T stage, UISS scores and SSIGN score were associated with poor OS in ccRCC patients. Multivariate Cox analysis demonstrated that higher FBXO11 levels and higher UISS score were independent prognostic indicators for OS. Nomogram, calibration plots, AUC values and the C-index showed that the predictive accuracy of conventional prognostic models, including UISS score and SSIGN score, was improved when FBXO11 expression was added. Conclusions FBXO11 expression was closely related to RCC malignancy and poor prognosis, indicating its potential as a prognostic marker as well as a therapeutic target for RCC.
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- 2019
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22. Over-Expression of CD200 Protects Mice from Dextran Sodium Sulfate Induced Colitis.
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Zhiqi Chen, Kai Yu, Fang Zhu, and Reginald Gorczynski
- Subjects
Medicine ,Science - Abstract
CD200:CD200 receptor (CD200R) interactions lead to potent immunosuppression and inhibition of autoimmune inflammation. We investigated the effect of "knockout"of CD200 or CD200R, or over-expression of CD200, on susceptibility to dextran sodium sulfate (DSS)-induced colitis, a mouse model of inflammatory bowel disease (IBD).Acute or chronic colitis was induced by administration of dextran sodium sulfate (DSS) in four groups of age-matched C57BL/6 female mice: (1) CD200-transgenic mice (CD200tg); (2) wild-type (WT) mice; (3) CD200 receptor 1-deficient (CD200R1KO) mice; and (4) CD200-deficient (CD200KO) mice. The extent of colitis was determined using a histological scoring system. Colon tissues were collected for quantitative RT-PCR and Immunohistochemical staining. Supernatants from colonic explant cultures and mononuclear cells isolated from colonic tissue were used for ELISA.CD200KO and CD200R1KO mice showed greater sensitivity to acute colitis than WT mice, with accelerated loss of body weight, significantly higher histological scores, more severe infiltration of macrophages, neutrophils and CD3+ cells, and greater expression of macrophage-derived inflammatory cytokines, whose production was inhibited in vitro (in WT/CD200KO mouse cells) by CD200. In contrast, CD200tg mice showed less sensitivity to DSS compared with WT mice, with attenuation of all of the features seen in other groups. In a chronic colitis model, greater infiltration of Foxp3+ regulatory T (Treg) cells was seen in the colon of CD200tg mice compared to WT mice, and anti-CD25 mAb given to these mice attenuated protection.The CD200:CD200R axis plays an immunoregulatory role in control of DSS induced colitis in mice.
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- 2016
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23. Schlemm's Canal and Trabecular Meshwork in Eyes with Primary Open Angle Glaucoma: A Comparative Study Using High-Frequency Ultrasound Biomicroscopy.
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Xiaoqin Yan, Mu Li, Zhiqi Chen, Ying Zhu, Yinwei Song, and Hong Zhang
- Subjects
Medicine ,Science - Abstract
We investigated in vivo changes in Schlemm's canal and the trabecular meshwork in eyes with primary open angle glaucoma (POAG). Relationships between Schlemm's canal diameter, trabecular meshwork thickness, and intraocular pressure (IOP) were examined. Forty POAG patients and 40 normal individuals underwent 80-MHz Ultrasound Biomicroscopy examinations. The Schlemm's canal and trabecular meshwork were imaged in superior, inferior, nasal and temporal regions. Normal individuals had an observable Schlemm's canal in 80.3% of sections, a meridional canal diameter of 233.0±34.5 μm, a coronal diameter of 44.5±12.6 μm and a trabecular meshwork thickness of 103.9±11.1 μm, in POAG patients, Schlemm's canal was observable in 53.1% of sections, a meridional canal diameter of 195.6±31.3 μm, a coronal diameter of 35.7±8.0 μm, and a trabecular meshwork thickness of 88.3±13.2 μm, which significantly differed from normal (both p 21 mmHg) IOP, respectively (χ = 1.159, p = 0.282). Coronal canal diameter was significantly lower in the elevated IOP group (32.6±4.9 μm) than in the normal IOP group (35.7±8.0 μm, p < 0.001). This was also true of trabecular meshwork thickness (81.9±10.0 μm vs. 97.1±12.0 μm, p < 0.001). In conclusion, eyes with POAG had fewer sections with an observable Schlemm's canal. Canal diameter and trabecular meshwork thickness were also lower than normal in POAG patients. Schlemm's canal coronal diameter and trabecular meshwork thickness were negatively correlated with IOP.
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- 2016
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24. A High Precision Quality Inspection System for Steel Bars Based on Machine Vision
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Xinman Zhang, Jiayu Zhang, Mei Ma, Zhiqi Chen, Shuangling Yue, Tingting He, and Xuebin Xu
- Subjects
machine vision ,steel bars ,quality inspection ,dimensional measurement ,number counting ,high precision ,video data acquisition ,Chemical technology ,TP1-1185 - Abstract
Steel bars play an important role in modern construction projects and their quality enormously affects the safety of buildings. It is urgent to detect whether steel bars meet the specifications or not. However, the existing manual detection methods are costly, slow and offer poor precision. In order to solve these problems, a high precision quality inspection system for steel bars based on machine vision is developed. We propose two algorithms: the sub-pixel boundary location method (SPBLM) and fast stitch method (FSM). A total of five sensors, including a CMOS, a level sensor, a proximity switch, a voltage sensor, and a current sensor have been used to detect the device conditions and capture image or video. The device could capture abundant and high-definition images and video taken by a uniform and stable smartphone at the construction site. Then data could be processed in real-time on a smartphone. Furthermore, the detection results, including steel bar diameter, spacing, and quantity would be given by a practical APP. The system has a rather high accuracy (as low as 0.04 mm (absolute error) and 0.002% (relative error) of calculating diameter and spacing; zero error in counting numbers of steel bars) when doing inspection tasks, and three parameters can be detected at the same time. None of these features are available in existing systems and the device and method can be widely used to steel bar quality inspection at the construction site.
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- 2018
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25. Comparison of immunity in mice cured of primary/metastatic growth of EMT6 or 4THM breast cancer by chemotherapy or immunotherapy.
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Reginald M Gorczynski, Zhiqi Chen, Nuray Erin, Ismat Khatri, and Anna Podnos
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Medicine ,Science - Abstract
We have compared cure from local/metastatic tumor growth in BALB/c mice receiving EMT6 or the poorly immunogenic, highly metastatic 4THM, breast cancer cells following manipulation of immunosuppressive CD200:CD200R interactions or conventional chemotherapy.We reported previously that EMT6 tumors are cured in CD200R1KO mice following surgical resection and immunization with irradiated EMT6 cells and CpG oligodeoxynucleotide (CpG), while wild-type (WT) animals developed pulmonary and liver metastases within 30 days of surgery. We report growth and metastasis of both EMT6 and a highly metastatic 4THM tumor in WT mice receiving iv infusions of Fab anti-CD200R1 along with CpG/tumor cell immunization. Metastasis was followed both macroscopically (lung/liver nodules) and microscopically by cloning tumor cells at limiting dilution in vitro from draining lymph nodes (DLN) harvested at surgery. We compared these results with local/metastatic tumor growth in mice receiving 4 courses of combination treatment with anti-VEGF and paclitaxel.In WT mice receiving Fab anti-CD200R, no tumor cells are detectable following immunotherapy, and CD4+ cells produced increased TNFα/IL-2/IFNγ on stimulation with EMT6 in vitro. No long-term cure was seen following surgery/immunotherapy of 4THM, with both microscopic (tumors in DLN at limiting dilution) and macroscopic metastases present within 14 d of surgery. Chemotherapy attenuated growth/metastases in 4THM tumor-bearers and produced a decline in lung/liver metastases, with no detectable DLN metastases in EMT6 tumor-bearing mice-these latter mice nevertheless showed no significantly increased cytokine production after restimulation with EMT6 in vitro. EMT6 mice receiving immunotherapy were resistant to subsequent re-challenge with EMT6 tumor cells, but not those receiving curative chemotherapy. Anti-CD4 treatment caused tumor recurrence after immunotherapy, but produced no apparent effect in either EMT6 or 4THM tumor bearers after chemotherapy treatment.Immunotherapy, but not chemotherapy, enhances CD4+ immunity and affords long-term control of breast cancer growth and resistance to new tumor foci.
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- 2014
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26. Altered spontaneous brain activity in primary open angle glaucoma: a resting-state functional magnetic resonance imaging study.
- Author
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Yinwei Song, Ketao Mu, Junming Wang, Fuchun Lin, Zhiqi Chen, Xiaoqin Yan, Yonghong Hao, Wenzhen Zhu, and Hong Zhang
- Subjects
Medicine ,Science - Abstract
BACKGROUND:Previous studies demonstrated that primary open angle glaucoma (POAG) is associated with abnormal brain structure; however, little is known about the changes in the local synchronization of spontaneous activity. The main objective of this study was to investigate spontaneous brain activity in patients with POAG using regional homogeneity (ReHo) analysis based on resting state functional magnetic resonance imaging (rs-fMRI). METHODOLOGY/PRINCIPAL FINDINGS:Thirty-nine POAG patients and forty-one age- and gender- matched healthy controls were finally included in the study. ReHo values were used to evaluate spontaneous brain activity and whole brain voxel-wise analysis of ReHo was carried out to detect differences by region in spontaneous brain activity between groups. Compared to controls, POAG patients showed increased ReHo in the right dorsal anterior cingulated cortex, the bilateral medial frontal gyrus and the right cerebellar anterior lobe, and decreased ReHo in the bilateral calcarine, bilateral precuneus gryus, bilateral pre/postcentral gyrus, left inferior parietal lobule and left cerebellum posterior lobe. A multiple linear regression analysis was performed to explore the relationships between clinical measures and ReHo by region showed significant group differences in the POAG group. Negative correlations were found between age and the ReHo values of the superior frontal gyrus (r = -0.323, p = 0.045), left calcarine (r = -0.357, p = 0.026) and inferior parietal lobule (r = -0.362, p = 0.024). A negative correlation was found between the ReHo values of the left precuneus and the cumulative mean defect (r = -0.400, p = 0.012). CONCLUSIONS:POAG was associated with abnormal brain spontaneous activity in some brain regions and such changed regional activity may be associated with clinical parameters. Spontaneous brain activity may play a role in POAG initiation and progression.
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- 2014
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27. On isometry groups of pseudo-Riemannian compact Lie groups
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Fuhai, Zhu, Zhiqi, Chen, and Ke, Liang
- Subjects
Mathematics - Differential Geometry ,53C50, 53C30 - Abstract
Let $G$ be a connected, simply-connected, compact simple Lie group. In this paper, we show that the isometry group of $G$ with a left-invariant pseudo-Riemannan metric is compact. Furthermore, the identity component of the isometry group is compact if $G$ is not simply-connected.
- Published
- 2020
28. An Online Approach for DNN Model Caching and Processor Allocation in Edge Computing.
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Zhiqi Chen, Sheng Zhang 0001, Zhi Ma 0002, Shuai Zhang, Zhuzhong Qian, Mingjun Xiao, Jie Wu 0001, and Sanglu Lu
- Published
- 2022
- Full Text
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29. Joint label refinement and contrastive learning with hybrid memory for Unsupervised Marine Object Re-Identification.
- Author
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Xiaorui Han, Zhiqi Chen, Ruixue Wang, and Pengfei Zhao
- Published
- 2021
- Full Text
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30. Macular GCIPL Thickness Map Prediction via Time-Aware Convolutional LSTM.
- Author
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Zhiqi Chen, Yao Wang, Gadi Wollstein, María de los Angeles Ramos-Cadena, Joel S. Schuman, and Hiroshi Ishikawa 0005
- Published
- 2020
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31. A Novel Algorithm for NFV Chain Placement in Edge Computing Environments.
- Author
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Zhiqi Chen, Sheng Zhang 0001, Can Wang, Zhuzhong Qian, Mingjun Xiao, Jie Wu 0001, and Imad Jawhar
- Published
- 2018
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32. Brave Fireman
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Zhu, Bener, Zhihong, Wei, and Zhiqi, Chen
- Subjects
Construct - Abstract
The player is a fireman in the city, and his job is to put out the fire and keep the city safe. When the player enters the game, he will land on a ladder. In the game screen, there will be several houses that are on fire. As a fireman, the player needs to put out the fire for the houses in limited time. The little fireman sprite can be moved by pressing the up, left, and right buttons. Up is jump, left and right is to go left or right. The player can move and jump down or back up to the ladder. To put out the fire, the player can press space to shoot water from the squirt gun.
- Published
- 2021
33. End-to-End Neural Video Coding Using a Compound Spatiotemporal Representation
- Author
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Haojie Liu, Ming Lu, Zhiqi Chen, Xun Cao, Zhan Ma, and Yao Wang
- Subjects
FOS: Computer and information sciences ,Computer Vision and Pattern Recognition (cs.CV) ,Image and Video Processing (eess.IV) ,FOS: Electrical engineering, electronic engineering, information engineering ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Computer Science - Computer Vision and Pattern Recognition ,Media Technology ,Electrical Engineering and Systems Science - Image and Video Processing ,Electrical and Electronic Engineering - Abstract
Recent years have witnessed rapid advances in learnt video coding. Most algorithms have solely relied on the vector-based motion representation and resampling (e.g., optical flow based bilinear sampling) for exploiting the inter frame redundancy. In spite of the great success of adaptive kernel-based resampling (e.g., adaptive convolutions and deformable convolutions) in video prediction for uncompressed videos, integrating such approaches with rate-distortion optimization for inter frame coding has been less successful. Recognizing that each resampling solution offers unique advantages in regions with different motion and texture characteristics, we propose a hybrid motion compensation (HMC) method that adaptively combines the predictions generated by these two approaches. Specifically, we generate a compound spatiotemporal representation (CSTR) through a recurrent information aggregation (RIA) module using information from the current and multiple past frames. We further design a one-to-many decoder pipeline to generate multiple predictions from the CSTR, including vector-based resampling, adaptive kernel-based resampling, compensation mode selection maps and texture enhancements, and combines them adaptively to achieve more accurate inter prediction. Experiments show that our proposed inter coding system can provide better motion-compensated prediction and is more robust to occlusions and complex motions. Together with jointly trained intra coder and residual coder, the overall learnt hybrid coder yields the state-of-the-art coding efficiency in low-delay scenario, compared to the traditional H.264/AVC and H.265/HEVC, as well as recently published learning-based methods, in terms of both PSNR and MS-SSIM metrics.
- Published
- 2022
34. On the classification of $3$-dimensional $F$-manifold algebras
- Author
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Ming Ding, Jifu Li, and Zhiqi Chen
- Published
- 2022
35. On m-Modified Conformal Vector Fields
- Author
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Hui Zhang and Zhiqi Chen
- Subjects
Geometry and Topology - Published
- 2023
36. The effect of ET1-CTGF mediated pathway on the accumulation of extracellular matrix in the trabecular meshwork and its contribution to the increase in IOP
- Author
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Junming Wang, Yan Rong, Ying Liu, Mengxia Zhu, Wei Chen, Zhiqi Chen, Jingmin Guo, Chaohua Deng, Anne Manyande, Ping Wang, Hong Zhang, and Yan Xiang
- Subjects
Ophthalmology - Published
- 2023
37. Tunable second-order topological insulators in Chern insulators 2H-FeX2 (X = Cl and Br)
- Author
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Xiaoran Feng, Linke Cai, Zhiqi Chen, Ying Dai, Baibiao Huang, and Chengwang Niu
- Subjects
Physics and Astronomy (miscellaneous) - Abstract
Engineering topological states in two-dimensional (2D) magnets is of pivotal importance to provide significantly rich physics and application potential. Here, we theoretically demonstrate that the second-order topological insulators (SOTIs) with robust nontrivial corner states can be realized in Chern insulators via the widely used strain engineering. The quantum anomalous Hall effect in Chern insulators of honeycomb 2H-FeX2 (X = Cl and Br) is revealed with a nonzero Chern number C=1 and the emergence of metallic chiral edge states. Remarkably, under compressive or tensile strains, topological phase transitions are proposed with the gap-closing in different valleys, giving birth to the 2D SOTIs or trivial insulating 2D magnets. Moreover, large valley polarizations are clearly shown. Our findings open up a promising way for exploring the first- and higher-order topology with intriguing effects.
- Published
- 2023
38. The anterior scleral thickness in eyes with primary open-angle glaucoma
- Author
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Xiaoqin Yan, Mu Li, Zhiqi Chen, and Xiongwu Zhou
- Subjects
Cellular and Molecular Neuroscience ,Ophthalmology ,Trabecular Meshwork ,Humans ,Glaucoma, Open-Angle ,Intraocular Pressure ,Sclera ,Tomography, Optical Coherence ,Sensory Systems - Abstract
Purpose To investigate the anterior scleral thickness (AST) and its associations with Schlemm’s canal (SC) area, trabecular meshwork (TM) thickness and length, and scleral spur (SS) length in healthy and primary open-angle glaucoma (POAG) groups. Methods Thirty-five eyes of 35 healthy subjects and 23 eyes of 23 patients with POAG were included. The AST, SC area, TM thickness and length, and SS length were measured using swept-source optical coherence tomography. AST was measured at 0 mm (AST0), 1 mm (AST1), 2 mm (AST2), and 3 mm (AST3) from SS. Associations between AST and SC area, TM thickness and length, and SS length were also estimated. Results AST0 (728.84 ± 99.33 vs. 657.39 ± 67.02 μm, p p = 0.038), AST3 (571.09 ± 79.15 vs. 532.13 ± 59.84 μm, p = 0.009), SC area (6304.26 ± 1238.72 vs. 4755.64 ± 1122.71 μm2, p p = 0.035), TM length (736.20 ± 141.85 vs. 656.43 ± 127.03 μm, p = 0.004), and SS length (219.89 ± 50.29 vs. 174.54 ± 35.58 μm, p Conclusions Compared with the healthy group, AST was significantly thinner in the POAG group, which also had smaller SC and TM dimensions. Moreover, the SC area, TM thickness, and SS length were significantly and positively associated with AST in the healthy group. Thus, AST might play an important role in maintaining TM and SC morphology and further in the pathogenesis of POAG.
- Published
- 2022
39. Corrigendum to 'Lie groups with conformal vector fields induced by derivations' [J. Algebra 584 (2021) 304–316]
- Author
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Hui Zhang and Zhiqi Chen
- Subjects
Algebra and Number Theory - Published
- 2022
40. Lie groups with conformal vector fields induced by derivations
- Author
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Zhiqi Chen and Hui Zhang
- Subjects
Pure mathematics ,Algebra and Number Theory ,010102 general mathematics ,Lie group ,Conformal map ,Extension (predicate logic) ,Type (model theory) ,01 natural sciences ,Unimodular matrix ,0103 physical sciences ,Metric (mathematics) ,Simply connected space ,Vector field ,Mathematics::Differential Geometry ,010307 mathematical physics ,0101 mathematics ,Mathematics - Abstract
A pseudo-Riemannian Lie group ( G , 〈 ⋅ , ⋅ 〉 ) is a connected and simply connected Lie group with a left-invariant pseudo-Riemannian metric of type ( p , q ) . This paper is to study pseudo-Riemannian Lie groups with non-Killing conformal vector fields induced by derivations which is an extension from non-Killing left-invariant conformal vector fields. First we prove that a Riemannian (i.e. type ( n , 0 ) ), Lorentzian (i.e. type ( n − 1 , 1 ) ) or trans-Lorentzian (i.e. type ( n − 2 , 2 ) ) Lie group with such a vector field is solvable. Then we construct non-solvable unimodular pseudo-Riemannian Lie groups with such vector fields for any min ( p , q ) ≥ 3 . Finally, we give the classification for the Riemannian and Lorentzian cases.
- Published
- 2021
41. Analogs of microgravity: the function of Schlemm’s canal, intraocular pressure and autonomic nervous during the head-down tilt test in healthy subjects
- Author
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Yan Xiang, Junming Wang, Chaohua Deng, Wei Chen, Hong Zhang, and Zhiqi Chen
- Subjects
Schlemm's canal ,medicine.medical_specialty ,Intraocular pressure ,genetic structures ,business.industry ,schlemm's canal ,autonomic nervous system ,Lumen (anatomy) ,head-down tilt ,RE1-994 ,Sitting ,Head-Down Tilt ,Autonomic nervous system ,Ophthalmology ,medicine.anatomical_structure ,Clinical Research ,Heart rate ,medicine ,Heart rate variability ,sense organs ,business ,aqueous humor ,intraocular pressure - Abstract
AIM: To evaluate the ocular outcomes and to elucidate possible mechanisms underlying intraocular pressure (IOP) change following the head-down tilt (HDT) test. METHODS: The study included 21 participants at the Department of Ophthalmology of Tongji Hospital. Subjects received the test of I-care tonometry, enhanced depth imaging optical coherence tomography and heart rate variability (HRV) analysis before and after 15min HDT test. The lumen area of Schlemm’s canal (SCAR), IOP, HRV were calculated. RESULTS: IOP increased significantly after 20° head down position from 14.0±3.0 to 17.0±3.3 mm Hg (P
- Published
- 2021
42. Application of Wireless Sensor Network in Farmland Data Acquisition System.
- Author
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Bei Wang, Xiaona Guo, Zhiqi Chen, and Zhaoqian Shuai
- Published
- 2011
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43. Invariant geodesic orbit metrics on certain compact homogeneous spaces
- Author
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Huibin Chen, Zhiqi Chen, Zaili Yan, and Fuhai Zhu
- Subjects
General Mathematics - Published
- 2022
44. Quantification of Iris Atrophy by Swept-Source Optical Coherence Tomography in Posner-Schlossman Syndrome
- Author
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Xiaoqin Yan, Mu Li, Wei Chen, and Zhiqi Chen
- Subjects
General Medicine ,Posner-Schlossman syndrome ,iris atrophy ,optical coherence tomography - Abstract
Purpose: To investigate iris atrophy in Posner–Schlossman syndrome (PSS). Methods: Sixty-one patients with PSS were included. Using swept-source optical coherence tomography, the thickness of anterior border layer (A), middle stromal layer (M), and the posterior pigmented epithelial layer (P) of iris were measured at 500 μm, 1000 μm, 1500 μm, 2000 μm, and 2500 μm from the pupillary edge in both PSS-affected and fellow eyes. The relationships between iris thickness and corneal endothelium density, cup-to-disc (C/D) ratio, and retinal nerve fiber layer (RNFL) thickness were also estimated in PSS-affected eyes. Results: Iris thickness parameters, including M500, M1000, A1500, A2000, P2000, and P2500, were significantly thinner in PSS-affected eyes than in fellow eyes (all p < 0.05). Moreover, M500 and M1000 were significantly associated with corneal endothelium density (p = 0.047 and 0.018, respectively), and M500 was significantly associated with C/D ratio (p = 0.001) and RNFL thickness (p = 0.037) in PSS-affected eyes. Conclusions: Iris showed significant thinning and atrophy in PSS-affected eyes, and iris stromal thickness close to the pupillary edge could be a novel clinical predictor of the changes in corneal endothelium, C/D ratio, and RNFL thickness in PSS.
- Published
- 2022
45. Describing the APIs comprehensively: Obtaining the holistic representations from multiple modalities data for different tasks
- Author
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Xun Li, Lei Liu, Zhiqi Chen, Yuzhou Liu, and Huaxiao Liu
- Subjects
Software ,Computer Science Applications ,Information Systems - Published
- 2023
46. Private labels and product quality under asymmetric information
- Author
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Heng Xu and Zhiqi Chen
- Subjects
Economics and Econometrics ,National brand ,business.industry ,Strategy and Management ,Bond ,05 social sciences ,General Business, Management and Accounting ,Profit (economics) ,Private label ,Information asymmetry ,Management of Technology and Innovation ,0502 economics and business ,050211 marketing ,050207 economics ,business ,Quality assurance ,Industrial organization - Abstract
Contrary to the existing theories of private label products, we demonstrate that the introduction of a private label product by a retailer may improve the profits of the supplier of a competing national brand product. Our theory is built on two main elements. First, the introduction of a private label product may expand the total demand for the products carried by the retailer and thus enlarge the joint profit to be split between the retailer and the supplier of the national brand product. Second, in an environment where consumers do not know the quality of the private label product, the national brand serves as a bond to assure consumers that the retailer sells high-quality products only. This quality assurance enhances the joint profit generated by the introduction of the private label product, which, in conjunction with the weakening of the retailer’s bargaining position caused by asymmetric information, may enable the national brand supplier to earn a larger profit than in the absence of the private label product.
- Published
- 2021
47. Weakly symmetric pseudo–Riemannian nilmanifolds
- Author
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Joseph A. Wolf and Zhiqi Chen
- Subjects
Algebra and Number Theory ,Geometry and Topology ,Analysis - Published
- 2022
48. The association between inflammatory biomarkers and carotid artery plaque in normal-weight and metabolically healthy Chinese adults: a cross-sectional study
- Author
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Xiaomin Zhang, Ting Zhang, Chunhua Wu, Yiquan Zhou, Zhiqi Chen, and Renying Xu
- Subjects
Physiology ,Internal Medicine ,Cardiology and Cardiovascular Medicine - Abstract
Existing evidence has indicated a role of inflammation in the development of carotid artery plaque (CAP). We thus evaluated the association between inflammation and CAP in a population with normal body weight and metabolically healthy status. A total of 8050 normal-body-weight and metabolically healthy participants (2613 men and 5437 women, aged 40.5 ± 11.3 y) were included in this study. Inflammatory status was evaluated by three parameters: serum hs-CRP (high-sensitivity C-reactive protein), WBC (white blood cell) count, and NLR (neutrophil-to-lymphocyte ratio). CAP was detected by ultrasound B-mode imaging. Clinical data were abstracted from medical records. Metabolically healthy status was defined as no history of metabolic diseases and normal blood pressure, fasting blood glucose level, hemoglobin A1c level, lipid profile, and liver ultrasonographic findings. The serum level of hs-CRP, but not WBC or NLR, was associated with the risk of CAP after adjustment for age, sex, BMI, blood pressure, fasting blood glucose, glycated hemoglobin A1c, lipid profile, and estimated glomerular filtration rate. The adjusted odds ratio for the risk of CAP was 2.71 (1.64, 4.46) for participants with a high level of hs-CRP (≥3 mg/L), compared with those with a low level (1 mg/L). Each unit increase in hs-CRP was associated with a 24% higher risk of CAP (OR = 1.24; 95% CI: 1.12, 1.37). Inflammation was associated with the risk of CAP even in individuals with a normal body weight and metabolically healthy status.
- Published
- 2022
49. Radical Carbosulfonylation of Propellane: Synthesis of Sulfonyl β-Keto-bicyclo[1,1,1]pentanes
- Author
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Yunlong Wei, Zhen Wu, Yaohui Xu, Xinxin Wu, Chen Zhu, and Zhiqi Chen
- Subjects
Sulfonyl ,chemistry.chemical_classification ,Bicyclic molecule ,010405 organic chemistry ,Organic Chemistry ,Pentanes ,010402 general chemistry ,01 natural sciences ,Catalysis ,0104 chemical sciences ,Propellane ,chemistry.chemical_compound ,chemistry ,Reagent ,Functional group ,Organic chemistry ,Benzene - Abstract
The construction of multiply functionalized bicyclo[1.1.1]pentanes (BCPs) is of high synthetic value, as they are frequently harnessed as bioisosteres of 1,3-disubstituted benzene rings, alkynes, and tert-butyl groups in medicinal chemistry. Herein, we disclose a practical radical-mediated carbosulfonylation of propellane for the synthesis of sulfonyl β-keto-substituted BCPs by using vinyl sulfonates as dual-function reagent. This protocol features broad functional group tolerance and excellent atom-economy, leading to a variety of valuable difunctionalized BCP derivatives under mild photochemical conditions.
- Published
- 2021
50. Quantitative analysis of internal components of the human crystalline lens during accommodation in adults
- Author
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Jinming Guo, Qiongfang Xu, Wei Chen, Ting Fu, Ping Wang, Anne Manyande, Hong Zhang, Zhiqi Chen, Xuebi Tian, Junming Wang, Yan Xiang, and Chaohua Deng
- Subjects
Adult ,medicine.medical_specialty ,clinical_medicine ,Science ,Posterior parietal cortex ,01 natural sciences ,Article ,010309 optics ,03 medical and health sciences ,0302 clinical medicine ,Ophthalmology ,Cortex (anatomy) ,0103 physical sciences ,Lens, Crystalline ,medicine ,Image Processing, Computer-Assisted ,Humans ,Multidisciplinary ,Lenticular nucleus ,business.industry ,Age Factors ,Accommodation, Ocular ,health ,clinical-care ,Healthy Volunteers ,eye diseases ,medicine.anatomical_structure ,Preclinical research ,Lens (anatomy) ,Anterior cortex ,030221 ophthalmology & optometry ,Vertex (curve) ,Medicine ,sense organs ,Anatomy ,business ,Nucleus ,Accommodation ,Tomography, Optical Coherence - Abstract
Objectives. To quantitatively analyze changes in the inner components of the human crystalline lens during accommodation in adults. \ud Methods. Eyes of 23 subjects were sequentially examined using CASIA2 Optical Coherence Tomography under 0D, -3D and -6D accommodation states. The anterior chamber depth (ACD), anterior and posterior crystalline lens radius of the curvature (ALRC and PLRC) were obtained using built-in software. The lens thickness (LT), lenticular nucleus thickness (NT), anterior cortex thickness (ACT), posterior cortex thickness (PCT), anterior and posterior lenticular nucleus radius of the curvature (ANRC and PNRC), anterior and posterior lenticular nucleus vertex (ANV and PNV) were quantified manually with the Image-pro plus software.\ud Results. During accommodation, the ACD became significantly shallower and LT significantly increased. For changes in the lens, the ALRC decreased by an average magnitude (related to accommodative stimuli) 0.44 mm/D and PLRC decreased 0.09 mm/D. There was no difference for the ACT and PCT in different accommodation states. For lenticular nucleus response, NT increased on average by 30μm/D. Both the ANRC and PNRC decreased on average by 212 μm/D and 115 μm/D respectively. The ANV moved forward on average by 0.07mm under -3D accommodative stimuli and 0.16mm for -6D. However, there was no statistically significant difference between different accommodation states in the PNV movement.\ud Conclusion. Under accommodation stimulation, lens thickness changed mainly due to the lenticular nucleus, but not the cortex. For the lenticular nucleus, both the ANRC and PNRC decreased and ANRC changed the most. The anterior surface of the nucleus moved forward while the posterior surface of the nucleus moved backward but only slightly.\ud Keywords: crystalline lens, lenticular nucleus, lenticular cortex, accommodation
- Published
- 2021
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