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Chinese Journal of Polymer Science 2021年第4期39卷 397-416,I0004页

作者： Feng Cai yu-xuan chen Wen-Zhong Wang Hai-Feng yu Department of Materials Science and Engineering and Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationCollege of EngineeringPeking UniversityBeijing 100871China

The great potential of liquid-crystalline block copolymers(LCBCs)containing photoresponsive mesogens toward novel applications in photonics and nanotechnology has been attracting increasing attention,due to the combination of the inherent property of microphase separation of block copolymers and the hierarchically-assembled structures of liquid-crystalline polymers(LCPs).The periodically ordered nanostructures in bulk film of LCBCs can be acquired by supramolecular cooperative motion,derived from the interaction between liquid-crystalline elastic deformation and microphase separation,which are able to improve physical properties of polymer film toward advanced functional ***,various micro/nano-patterned structures have been fabricated via light manipulation of photoresponsive LCBCs with good reproducibility and mass *** to recent developments in synthesis and polymerization techniques,diverse azobenzene-containing LCBCs have been designed,resulting in the creation of a wide variety of novel *** review illustrates recent progresses in macroscopic regulation of hierarchical nanostructures in LCBCs towards functional *** existing challenges are also discussed,showing perspectives for future studies.

关键词： Liquid-crystalline block copolymers Microphase separation Hierarchical nanostructures Functional materials

A Liutex-based subgrid stress model for large-eddy simulation

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Journal of Hydrodynamics 2022年第6期34卷 1145-1150页

作者： yuan Ding Bi-yu Pang Bo-wen Yan Yi-qian Wang yu-xuan chen yue-hong Qian School of Mathematical Science Soochow UniversitySuzhou215006China Department of Computer Science and Technology Tsinghua UniversityBeijing100084China

The concept of vortex is crucial in both understanding and modeling of *** large eddy simulation(LES),the effect of small-scale eddies onto the large scales or the resolved flow field is modeled by subgrid stress *** though the rotating motions of fluids,i.e.,vortices or eddies are central in developing turbulent models,vortex identification methods are seldom used in these *** this study,we develop a new subgrid model based on the Liutex vector,a new quantity introduced to decompose fluid motions into rigid rotation,pure shear and stretching,and thus identify *** new model is then applied in a decaying homogeneous isotropic turbulence(DHIT)and a turbulent channel flow at Reynolds number Reτ=*** is shown that the new model can predict accurate energy spectra compared with experiments in DHIT and give a well-matched velocity profile in turbulent channel flow without changing the form of the *** directions include improvement of the Liutex based model,for example developing anisotropic subgrid models,and its applications in various turbulent flows.

关键词： Liutex large eddy simulation(LES) subgrid model homogeneous isotropic turbulence turbulent channel flow

Proliferative potential and angiogenic characteristics of blood outgrowth endothelial cells derived from middle-aged and older adults

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Journal of Geriatric Cardiology 2024年第11期21卷 1071-1084页

作者： Xue-Juan XIA xuan-yu chen Lin-Lin XIAO School of Health Science and Engineering University of Shanghai for Science and TechnologyShanghaiChina Department of Food Science&Technology National University of SingaporeSingaporeSingapore Department of Laboratory Medicine Affiliated Sixth People's Hospital South CampusShanghai Jiaotong UniversityShanghaiChina

Objectives Autologous blood outgrowth endothelial cells(BOECs)have been proposed to induce therapeutic angiogenesis for treating cardiovascular diseases(CVDs).The aim of the present study was to investigate the proliferative potential and angiogenic characteristics of BOECs among middle-aged and older adults,the population particularly susceptible to *** BOECs were isolated from 48 peripheral blood samples of subjects aged 56±4 *** cells were then distinguished based on their proliferative abilities,and their phenotype,tube formation capacity,and migratory activity were compared using immunofluorescence staining,flow cytometry,tube formation assay,and wound healing assay,*** between demographic,clinical,and dietary parameters with the number of BOECs were also *** A total of 132 BOEC colonies with different proliferative potentials were obtained,including colonies lost proliferative ability before passage 3(named LPA),stopped proliferating during passage 3–8(HPA(3–8)),and proliferated after passage 8(HPA(>8)).LPA cells appeared later and displayed abnormal morphology,while HPA(3–8)cells exhibited alterations in von Willebrand factor morphology and lower KDR ***(>8)cells obtained higher branching intervals and individual cell migration velocity compared with those of HPA(3–8)*** analysis showed that the number of both LPA and HPA colonies were positively associated with several CVD risk ***,the number of LPA colonies was positively associated with servings of meats and alternatives,fruits,fruits and vegetables,as well as the protein *** Our findings provide evidence that the middle-aged and older populations possess BOECs with different proliferative and angiogenic potentials,exhibiting distinctions in cell morphology,appearance dates,VWF morphology,and KDR ***,a higher number of BOECs is likely associated with an increased risk of CVDs,while t

关键词： healing passage characteristics

In-situ synchrotron high energy X-ray diffraction study of spontaneous reorientation of R phase upon cooling in nanocrystalline Ti_(50)Ni_(45.5)Fe_(4.5)alloy

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Rare Metals 2022年第6期41卷 1948-1954页

作者： Zhi-yuan Ma yu-xuan chen Yang Ren Kai-yuan yu Da-Qiang Jiang Yi-Nong Liu Li-Shan Cui Department of Materials Science and Engineering China University of Petroleum(Beijing)Beijing 102249China Department of Physics City University of Hong KongHong Kong 999077China Centre for Neutron Scattering City University of Hong KongHong Kong 999077China Department of Mechanical Engineering The University of Western AustraliaPerthWA 6009Australia

This study investigated a peculiar phenomenon of self-reorientation of thermally formed R phase in nanocrystalline Ti_(50)Ni_(45.5)Fe_(4.5)by means of in-situ syn-chrotron high energy X-ray diffraction(HE-XRD).Two samples with different average grain sizes of 40 and 90 nm were investigated.R phase in the 40-nm grain size sample was found to self-reorient gradually upon cooling,whereas the same phenomenon did not occur in the 90-nm grain size *** self-reorientation process is attributed to the development and evolution of an internal stress anisotropy caused by the second order continuous lattice distortion of R phase upon further cooling in the small nanograined matrix,which lacks the self-accommodation mechanism for internal stress cancellation.

关键词： TiNiFe Martensitic transformation R phase reorientation Synchrotron diffraction Nanocrystalline material

Sn/n3O4-x heterostructure rich in oxygen vacancies with enhanced visible light photocatalytic oxidation performance

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International Journal of Minerals,Metallurgy and Materials 2021年第1期28卷 150-159页

作者： Rui-qi Yang Na Liang xuan-yu chen Long-wei Wang Guo-xin Song Yan-chen Ji Na Ren Ya-wei Lü Jian Zhang Xin yu Institute for Advanced Interdisciplinary Research(IAIR) University of JinanJinan 250022China School of physics and electronics Hunan UniversityChangsha 410082China Institute Charles Gerhardt UMR 5253CNRS-UM-ENSCMUniversitéde MontpellierPlace Eugène BataillonF-34095 Montpellier cedex 5France

Sn3O4, a common two-dimensional semiconductor photocatalyst, can absorb visible ***, owing to its rapid recombination of photogenerated electron-hole pairs, its absorption is not sufficient for practical *** this work, a Sn nanoparticle/Sn3O4-x nanosheet heterostructure was prepared by in situ reduction of Sn3O4 under a H2 *** Schottky junctions formed between Sn and Sn3O4-x can enhance the photogenerated carrier separation *** the hydrogenation process, a portion of the oxygen in the semiconductor can be extracted by hydrogen to form water, resulting in an increase in oxygen vacancies in the *** heterostructure showed the ability to remove Rhodamine *** cytocompatibility experiments proved that Sn/Sn3O4-x can significantly enhance cell compatibility and reduce harm to *** work provides a new method for the fabrication of a Schottky junction composite photocatalyst rich in oxygen vacancies with enhanced photocatalytic performance.

关键词： photocatalysis tin oxide oxygen vacancy Schottky junction photodegradation

Exosomes derived from stem cells as an emerging therapeutic strategy for intervertebral disc degeneration

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World Journal of Stem Cells 2020年第8期12卷 803-813页

作者： Zhi-Lei Hu Hai-Yin Li Xian Chang yue-Yang Li chen-Hao Liu Xiao-Xin Gao yu Zhai yu-xuan chen Chang-Qing Li Department of Orthopedics Xinqiao HospitalArmy Military Medical UniversityChongqing 400037China Center of Traumatic Orthopedics People's Liberation Army 990 HospitalXinyang 46400Henan ProvinceChina

Intervertebral disc(IVD)degenerative diseases are a common problem in the world,and they cause substantial social and economic burdens for *** current methods for treating IVD degenerative diseases mainly include surgery and conservative treatment,which cannot fundamentally restore the normal structure of the *** continuous research on the mechanism of degeneration and the development of regenerative medicine,rapid progress has been made in the field of regenerative medicine regarding the use of stem cell-derived exosomes,which are active biological substances used in intercellular communication,because they show a strong effect in promoting tissue *** study of exosomes in the field of IVD degeneration has just begun,and many surprising achievements have been *** paper mainly reviews the biological characteristics of exosomes and highlights the current status of exosomes in the field of IVD degeneration,as well as future developments regarding exosomes.

关键词： Exosomes Intervertebral disc degeneration Stem cells MicroRNA Regenerative medicine Biological characteristic

Microbiota in health and diseases

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Signal Transduction and Targeted Therapy 2022年第5期7卷 1491-1518页

作者： Kaijian Hou Zhuo-Xun Wu xuan-yu chen Jing-Quan Wang Dongya Zhang Chuanxing Xiao Dan Zhu Jagadish B.Koya Liuya Wei Jilin Li Zhe-Sheng chen Department of Endocrine and Metabolic Diseases Longhu HospitalThe First Affiliated Hospital of Medical College of Shantou UniversityShantouGuangdong 515000China Department of Pharmaceutical Sciences Institute for BiotechnologyCollege of Pharmacy and Health SciencesSt.John’s UniversityQueensNY 11439USA Microbiome Research Center Moon(Guangzhou)Biotech LtdGuangzhou 510535China School of Pharmacy Weifang Medical UniversityWeifangShandong 261053China Department of Cardiovascular The Second Affiliated Hospital of Medical College of Shantou UniversityShantouGuangdong 515000China

The role of microbiota in health and diseases is being highlighted by numerous studies since its *** on the localized regions,microbiota can be classified into gut,oral,respiratory,and skin *** microbial communities are in symbiosis with the host,contributing to homeostasis and regulating immune ***,microbiota dysbiosis can lead to dysregulation of bodily functions and diseases including cardiovascular diseases(CVDs),cancers,respiratory diseases.

关键词： diseases respiratory homeostasis

Cell polarization in ischemic stroke: molecular mechanisms and advances

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Neural Regeneration Research 2025年第3期20卷 632-645页

作者： yuanwei Li Xiaoxiao Xu xuan Wu Jiarui Li Shiling chen Danyang chen Gaigai Li Zhouping Tang Department of Neurology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei ProvinceChina

Ischemic stroke is a cerebrovascular disease associated with high mortality and disability rates. Since the inflammation and immune response play a central role in driving ischemic damage, it becomes essential to modulate excessive inflammatory reactions to promote cell survival and facilitate tissue repair around the injury site. Various cell types are involved in the inflammatory response, including microglia, astrocytes, and neutrophils, each exhibiting distinct phenotypic profiles upon stimulation. They display either proinflammatory or anti-inflammatory states, a phenomenon known as ‘cell polarization.’ There are two cell polarization therapy strategies. The first involves inducing cells into a neuroprotective phenotype in vitro, then reintroducing them autologously. The second approach utilizes small molecular substances to directly affect cells in vivo. In this review, we elucidate the polarization dynamics of the three reactive cell populations(microglia, astrocytes, and neutrophils) in the context of ischemic stroke, and provide a comprehensive summary of the molecular mechanisms involved in their phenotypic switching. By unraveling the complexity of cell polarization, we hope to offer insights for future research on neuroinflammation and novel therapeutic strategies for ischemic stroke.

关键词： astrocyte polarization immune regulation inflammation ischemic injury microglia polarization neutrophil polarization signaling pathways stroke

Effect of arterioportal shunting in radical resection of hilar cholangiocarcinoma

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Chinese Medical Journal 2010年第22期123卷 3217-3219页

作者： chen Yong-liang HUANG Zhi-qiang HUANG Xiao-qiang DONG Jia-hong DUAN Wei-dong LIU Zhi-wei ZHANG xuan LIANG yu-rong chen Ming-yi Department of Hepatobiliary Surgery General Hospital of Chinese People's Liberation Army Beijing 100853 China

Background The resection and reconstruction of the hepatic artery is often required in radical surgery for hilar cholangiocarcinoma. In this study, we report our experience in performing arterioportal shunting as an alternative for the arterial reconstruction. Methods Four patients with hilar cholangiocarcinoma underwent extended left hepatectomy and caudate Iobectomy combined with en bloc resection of the hepatic artery and arterioportal shunting with restriction of the arterial caliber. The efficacy of arterioportal shunting was assessed by computed tomography angiography （CTA）. Results All the four patients recovered uneventfully without any complications. CTA showed a patent shunt and normal liver regeneration. No signs of portal hypertension were found at one year of follow-up. Conclusions Arterioportal shunting with restriction of the arterial caliber appears to be a feasible and safe alternative for the microvascular reconstruction after hepatic artery resection in radical surgery for hilar cholangiocarcinoma.

关键词： arterioportal shunting hilar cholangiocarcinoma restriction of the arterial caliber

Mechanistic insight into the synergy between nickel single atoms and nanoparticles on N-doped carbon for electroreduction of CO2

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Journal of Energy Chemistry 2025年第1期100卷 327-336页

作者： Mingdong Sun Wenwen Guan Cailing chen Chao Wu Xiaoling Liu Biao Meng Tao chen yu Han Jun Wang Shibo Xi yu Zhou State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University Advanced Membranes and Porous Materials Center Physical Sciences and Engineering Division King Abdullah University of Science and Technology Institute of Sustainability for Chemicals Energy and Environment A*STAR (Agency for Science Technology and Research) College of Materials Science and Engineering Sichuan University

The synergy of single atoms （SAs） and nanoparticles （NPs） has demonstrated great potential in promoting the electrocatalytic carbon dioxide reduction reaction （CO2RR）;however,the rationalization of the SAs/NPs proportion remains one challenge for the catalyst ***,a Ni2+-loaded porous poly（ionic liquids）(PIL) precursor synthesized through the free radical self-polymerization of the ionic liquid monomer,1-allyl-3-vinylimidazolium chloride,was pyrolyzed to prepare the Ni,N co-doped carbon materials,in which the proportion of Ni SAs and NPs could be facilely modulated by controlling the annealing *** catalyst Ni-NC-1000 with a moderate proportion of Ni SAs and NPs exhibited high efficiency in the electrocatalytic conversion of CO2into *** Ni K-edge X-ray absorption near-edge structure （XANES） spectra and theoretical calculations were conducted to gain insight into the synergy of Ni SAs and *** charge transfer from Ni NPs to the surrounding carbon layer and then to the Ni SAs resulted in the electron-enriched Ni SAs active *** the electroreduction of CO2,the coexistence of Ni SAs and NPs strengthened the CO2activation and the affinity towards the key intermediate of*COOH,lowering the free energy for the potential-determining*CO2→*COOH step,and therefore promoted the catalysis efficiency.

关键词： Single atom catalyst Synergy effect Carbon catalyst Electrocatalysis