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Mesenchymal stem cell-derived small extracellular vesicles enhance the therapeutic effect of retinal progenitor cells in retinal degenerative disease rats 认领 引用 被引量：2
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作者 Chunge Ren Min Chen +10 位作者 Bangqi Ren Yuxiao Zeng Qiang Tan Qiyou Li Xue Zhang Yajie Fang Yixiao Zhou Weitao Zhang Fang Chen Baishijiao Bian Yong Liu 《Neural Regeneration Research》 SCIE CAS CSCD 2026年第2期821-832,共12页
Our previous study demonstrated that combined transplantation of bone marrow mesenchymal stem cells and retinal progenitor cells in rats has therapeutic effects on retinal degeneration that are superior to transplanta... Our previous study demonstrated that combined transplantation of bone marrow mesenchymal stem cells and retinal progenitor cells in rats has therapeutic effects on retinal degeneration that are superior to transplantation of retinal progenitor cells alone.Bone marrow mesenchymal stem cells regulate and interact with various cells in the retinal microenvironment by secreting neurotrophic factors and extracellular vesicles.Small extracellular vesicles derived from bone marrow mesenchymal stem cells,which offer low immunogenicity,minimal tumorigenic risk,and ease of transportation,have been utilized in the treatment of various neurological diseases.These vesicles exhibit various activities,including anti-inflammatory actions,promotion of tissue repair,and immune regulation.Therefore,novel strategies using human retinal progenitor cells combined with bone marrow mesenchymal stem cell-derived small extracellular vesicles may represent an innovation in stem cell therapy for retinal degeneration.In this study,we developed such an approach utilizing retinal progenitor cells combined with bone marrow mesenchymal stem cell-derived small extracellular vesicles to treat retinal degeneration in Royal College of Surgeons rats,a genetic model of retinal degeneration.Our findings revealed that the combination of bone marrow mesenchymal stem cell-derived small extracellular vesicles and retinal progenitor cells significantly improved visual function in these rats.The addition of bone marrow mesenchymal stem cell-derived small extracellular vesicles as adjuvants to stem cell transplantation with retinal progenitor cells enhanced the survival,migration,and differentiation of the exogenous retinal progenitor cells.Concurrently,these small extracellular vesicles inhibited the activation of regional microglia,promoted the migration of transplanted retinal progenitor cells to the inner nuclear layer of the retina,and facilitated their differentiation into photoreceptors and bipolar cells.These findings suggest that bone marrow mesenchymal stem cell-derived small extracellular vesicles potentiate the therapeutic efficacy of retinal progenitor cells in retinal degeneration by promoting their survival and differentiation. 展开更多
关键词 differentiation inflammation mesenchymal stem cells microglia migration rat retinal degeneration retinal progenitor cells small extracellular vesicles stem cell transplantation
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Electrocatalytic semi-hydrogenation of terminal alkynes through intermetallic hydrogen spillover on alloyed PdAu 认领 引用
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作者 Qiang Tan Yunxia Liu +4 位作者 Xiaohe Tan Yuxuan Jiang Chenkun Su Yuanyuan Ma Yongquan Qu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2025年第12期969-978,I0021,共10页
Electrocatalytic semi-hydrogenation of alkynes offers a sustainable pathway for synthesizing functionalized olefins,yet challenges in achieving high selectivity and Faradaic efficiency at low overpotentials remain unr... Electrocatalytic semi-hydrogenation of alkynes offers a sustainable pathway for synthesizing functionalized olefins,yet challenges in achieving high selectivity and Faradaic efficiency at low overpotentials remain unresolved.Herein,we report bimetallic PdAu electrocatalysts(PdAu@CC) with low Pd loadings for selective semi-hydrogenation of terminal alkynes through an intermetallic hydrogen spillover pathway.The optimized PdAu@CC catalysts with a Pd molar fraction of 4 % demonstrate exceptional performance in converting acetylene benzene to vinyl benzene,achieving 97.5 % selectivity and 78.2 % Faradaic efficiency at a low potential of -0.17 V vs.RHE,outperforming monometallic Au@CC and Pd@CC.Mechanistic investigations reveal that highly dispersed Pd sites in the Au matrix efficiently dissociate water to generate active H* intermediates.Au sites activate alkynes and promote alkenes desorption,which effectively avoid over-hydrogenation of alkynes.Kinetically favorable Pd-to-Au hydrogen spillover enables selective alkynes-to-alkene hydrogenation,suppressing competitive hydrogen evolution.This work highlights the intermetallic hydrogen spillover as a strategic pathway for designing dual-activesite electrocatalysts with high performance in alkyne semi-hydrogenation. 展开更多
关键词 Electrocatalysis Semi-hydrogenation Intermetallic hydrogen spillover Alloy Alkynes
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Research on the Problem of Autonomous Collision Avoidance and Risk Avoidance of Ships 认领 引用
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作者 Qiang Tan 《Journal of Electronic Research and Application》 2025年第3期262-269,共8页
This paper deeply explores the autonomous collision avoidance algorithm for intelligent ships,aiming to enhance the intelligence level and safety of ship collision avoidance by integrating navigation experience.An aut... This paper deeply explores the autonomous collision avoidance algorithm for intelligent ships,aiming to enhance the intelligence level and safety of ship collision avoidance by integrating navigation experience.An autonomous collision avoidance algorithm based on navigation experience is designed,a collision avoidance experience database is constructed,a quantitative model is established,and specific algorithm steps are implemented.The algorithm is verified and analyzed through simulation tests.The results show that the algorithm can effectively achieve autonomous ship collision avoidance in different scenarios,providing new ideas and methods for the development of intelligent ship collision avoidance technology. 展开更多
关键词 Intelligent ships Autonomous collision avoidance algorithm Navigation experience Quantitative model Simulation test
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Hierarchically mesoporous carbon spheres coated with a single atomic Fe-N-C layer for balancing activity and mass transfer in fuel cells 认领 引用 被引量：17
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作者 Chengyong Shu Qiang Tan +9 位作者 Chengwei Deng Wei Du Zhuofan Gan Yan Liu Chao Fan Hui Jin Wei Tang Xiao-dong Yang Xiaohua Yang Yuping Wu 《Carbon Energy》 SCIE CAS CSCD 2022年第1期1-11,共11页
Novel cost-effective fuel cells have become more attractive due to the demands for rare and expensive platinum-group metal(PGM)catalysts for mitigating the sluggish kinetics of the oxygen reduction reaction(ORR).The h... Novel cost-effective fuel cells have become more attractive due to the demands for rare and expensive platinum-group metal(PGM)catalysts for mitigating the sluggish kinetics of the oxygen reduction reaction(ORR).The high-cost PGM catalyst in fuel cells can be replaced by earth-abundant transition-metalbased catalysts,that is,an Fe-N-C catalyst,which is considered one of the most promising alternatives.However,the performance of the Fe-N-C catalyst is hindered by the low catalytic activity and poor stability,which is caused by insufficient active sites and the lack of optimization of the triple-phase interface for mass transportation.Herein,a novel Fe–N–C catalyst consisting of mono-dispersed hierarchically mesoporous carbon sphere cores and single Fe atom-dispersed functional shells are presented.The synergistic effect between highly dispersed Fe-active sites and well-organized porous structures yields the combination of high ORR activity and high mass transfer performance.The half-wave potential of the catalyst in 0.1M H2SO4 is 0.82 V versus reversible hydrogen electrode,and the peak power density is 812 mW·cm−2 in H2–O2 fuel cells.Furthermore,it shows superior methanol tolerance,which is almost immune to methanol poisoning and generates up to 162 mW·cm−2 power density in direct methanol fuel cells. 展开更多
关键词 fuel cell hierarchically mesoporous carbon spheres oxygen reduction reaction single‐atom catalysts
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A novel thioredoxin reductase inhibitor inhibits cell growth and induces apoptosis in HL-60 and K562 cells 认领 引用 被引量：12
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作者 Zuo-fu PENG Lin-xiang LAN +4 位作者 Fang ZHAO Jing LI Qiang TAN Han-wei YIN Hui-hui ZENG 《Journal of Zhejiang University-SCIENCE B》 SCIE CAS 2008年第1期16-21,共6页
Human thioredoxin reductase (TrxR) system is associated with cancer cell growth and anti-apoptosis process. Effects of 1,2-bis(1,2-benzisoselenazolone-3(2H)-ketone)ethane (BBSKE),a novel TrxR inhibitor,were investigat... Human thioredoxin reductase (TrxR) system is associated with cancer cell growth and anti-apoptosis process. Effects of 1,2-bis(1,2-benzisoselenazolone-3(2H)-ketone)ethane (BBSKE),a novel TrxR inhibitor,were investigated on human leu-kemia cell lines HL-60 and K562. BBSKE treatment induced cell growth inhibition and apoptosis in both cell lines. Apoptosis induced by BBSKE is through Bcl-2/Bax and caspase-3 pathways. Ehrlich's ascites carcinoma-bearing mice were used to inves-tigate the anti-tumor effect of BBSKE in vivo. Tumor-bearing mice treated with BBSKE showed an increase of life span with a comparable effect to cyclophosphamide (CTX). These results suggest a potential usage of BBSKE as a therapeutic agent against non-solid tumors. 展开更多
关键词 Thioredoxin reductase （TrxR） Novel TrxR inhibitor 1 2-[bis（1 2-benzisoselenazolone-3（2H）-ketone）]ethane（BBSKE） Apoptosis
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Dynamic mechanical characteristics of deep Jinping marble in complex stress environments 认领 引用 被引量：4
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作者 Chendi Lou Heping Xie +6 位作者 Ru Zhang Hai Ren Hao Luo Kun Xiao Yuan Peng Qiang Tan Li Ren 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第2期630-644,共15页
To reveal the dynamic mechanical characteristics of deep rocks,a series of impact tests under triaxial static stress states corresponding to depths of 300-2400 m were conducted.The results showed that both the strain ... To reveal the dynamic mechanical characteristics of deep rocks,a series of impact tests under triaxial static stress states corresponding to depths of 300-2400 m were conducted.The results showed that both the strain rates and the stress environments in depth significantly affect the mechanical characteristics of rocks.The sensitivity of strain rate to the dynamic strength and deformation modulus shows a negative correlation with depth,indicating that producing penetrative cracks in deep environments is more difficult when damage occurs.The dynamic strength shows a tendency to decrease and then increase slightly,but decreases sharply finally.Transmissivity demonstrates a similar trend as that of strength,whereas reflectivity indicates the opposite trend.Furthermore,two critical depths with high dynamically induced hazard possibilities based on the China Jinping Underground Laboratory(CJPL)were proposed for deep engineering.The first critical depth is 600-900 m,beyond which the sensitivity of rock dynamic characteristics to the strain rate and restraint of circumferential stress decrease,causing instability of surrounding rocks under axial stress condition.The second one lies at 1500-1800 m,where the wave impedance and dynamic strength of deep surrounding rocks drop sharply,and the dissipation energy presents a negative value.It suggests that the dynamic instability of deep surrounding rocks can be divided into dynamic load dominant and dynamic load induced types,depending on the second critical depth. 展开更多
关键词 Rock mechanics Split-Hopkinson pressure bar Coupled static‒dynamic loading Different depths Holmquist-Johnson-Cook(HJC)model
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Ordered mesoporous carbon spheres assisted Ru nanoclusters/RuO2 with redistribution of charge density for efficient CO2 methanation in a novel H2/CO2fuel cell 认领 引用 被引量：2
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作者 Yan Liu Tao Zhang +8 位作者 Chao Deng Shixiu Cao Xin Dai Shengwu Guo Yuanzhen Chen Qiang Tan Haiyan Zhu Sheng Zhang Yongning Liu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第9期116-124,I0004,共9页
Efficiently reducing carbon dioxide(CO2)into carbon chemicals and fuels is highly desirable due to the rapid growth of atmospheric CO2ncentration.In prior work,we described a unique H/CO2fuel cell driven by l... Efficiently reducing carbon dioxide(CO2)into carbon chemicals and fuels is highly desirable due to the rapid growth of atmospheric CO2ncentration.In prior work,we described a unique H/CO2fuel cell driven by low-valued waste heat,which not only CO2nverts CO2to methane(CH4)but also outputs electrical energy,yet the CO2reduction rate needs to be urgently improved.Here,a novel Ru-RuOcatalyst with heterostructure was grafted on mesoporous carbon spheres by in situ partially reducing RuOinto ultrasmall Ru clusters(~1 nm),in which heteroatom-doped carbon spheres as a matrix with excellent CO2nductivity and abundant pores can not only easily CO2nfine the formation of Ru nanocluster but also are beneficial to the exposed active sites of Ru CO2mplex and the mass transport.CO2mpared to pure RuOnanoparticles supported on carbon spheres,our CO2mposite catalyst boosts the CO2 nversion rate by more than 5-fold,reaching a value of 382.7μmol gcat.h-1at 170℃.Moreover,a decent output power density of 2.92 W mwas obtained from this H2/CO2fuel cell using Ru-RuOembedded carbon spheres as a cathode catalyst.The Ru-RuOheterostructure can modify the adsorption energy of CO2and induce the redistribution of charge density,thus boosting CO2reduction significantly.This work not only offers an efficient catalyst for this novel H2/CO2fuel cell but also presents a facile method to prepare Ru nanoclusters. 展开更多
关键词 CO2methanation Fuel cell Generating electricity Ru nanocluster/RuO2hybrid Ordered mesoporous carbon spheres
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Heteroatom anchors Fe-Mn dual-atom catalysts with bi-functional oxygen catalytic activity for low-temperature rechargeable flexible Zn-air batteries 认领 引用 被引量：4
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作者 Yuting He Hongtao Li +3 位作者 Yi Wang Yufei Jia Yongning Liu Qiang Tan 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第3期610-620,I0014,共11页
M-N-C(M=Fe,Co,Ni,etc.) catalyst owns high catalytic activity in the oxygen catalytic reaction which is the most likely to replace the Pt-based catalysts.But it is still a challenge to further increase the active site ... M-N-C(M=Fe,Co,Ni,etc.) catalyst owns high catalytic activity in the oxygen catalytic reaction which is the most likely to replace the Pt-based catalysts.But it is still a challenge to further increase the active site density.This article constructs the high-efficiency FeMn-N/S-C-1000 catalyst to realize ORR/OER bifunctional catalysis by hetero-atom,bimetal(Fe,Mn) doped simultaneously strategy.When evaluated it as bi-functional electro-catalysts,FeMn-N/S-C-1000 exhibits excellent catalytic activity(E1/2=0.924 V,Ej=10=1.617 V) in alkaline media,outperforms conventional Pt/C,RuO2 and most non-precious-metal catalysts reported recently,Such outstanding performance is owing to N,S co-coordinated with metal to form multi-types of single atom,dual atom active sites to carry out bi-catalysis.Importantly,nitrite poison test provides the proof that the active sites of FeMn-N/S-C are more than that of single-atom catalysts to promote catalytic reactions directly.To better understand the local structure of Fe and Mn active sites,XAS and DFT were employed to reveal that FeMn-N_5/S-C site plays the key role during catalysis.Notably,the FeMn-N/S-C-1000 based low-temperature rechargeable flexible Zn-air also exhibits superior discharge performance and extraordinary durability at-40℃.This work will provide a new idea to design diatomic catalysts applied in low-temperature rechargeable batteries. 展开更多
关键词 Fe Mn-N/S-C-1000 ORR OER Rechargeable flexible Zn-air batteries
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Temperature Rise Calculation and Velocity Planning of Permanent Magnet Linear Synchronous Motor under Trapezoidal Speed 认领 引用 被引量：3
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作者 Xuzhen Huang Zheng Wang +1 位作者 Yiwei Zhang Qiang Tan 《CES Transactions on Electrical Machines and Systems》 CSCD 2022年第3期225-234,共10页
For permanent magnet linear synchronous motor(PMLSM) working at trapezoidal speed for long time, high thrust brings high temperature rise, while low thrust limits dynamic performance. Thus, it is crucial to find a bal... For permanent magnet linear synchronous motor(PMLSM) working at trapezoidal speed for long time, high thrust brings high temperature rise, while low thrust limits dynamic performance. Thus, it is crucial to find a balance between temperature rise and dynamic performance. In this paper, a velocity planning model of the PMLSM at trapezoidal speed based on electromagnetic-fluid-thermal(EFT) field is proposed to obtain the optimal dynamic performance under temperature limitation. In this model, the winding loss is calculated considering the acceleration and deceleration time. The loss model is indirectly verified by the temperature rise experiment of an annular winding sample. The actual working conditions of the PMLSM are simulated by dynamic grid technology to research the influence of acceleration and deceleration on fluid flow in the air gap, and the variation rule of the thermal boundary condition is analyzed. Combined with the above conditions, the temperature rise of a coreless PMLSM(CPMLSM) under the rated working condition is calculated and analyzed in detail. Through this method and several iterations, the optimal dynamic performance under the temperature limitation is achieved. The result is verified by a comparison between simulation and prototype tests, which can help improve the dynamic performance. 展开更多
关键词 Permanent magnet linear synchronous motor temperature rise velocity planning electromagnetic-fluidthermal field dynamic performance
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Alkali ion-promoted palladium subnanoclusters stabilized on porous alumina nanosheets with enhanced catalytic activity for benzene oxidation 认领 引用 被引量：3
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作者 Zhijun Li Minghui Di +8 位作者 Wei Wei Leipeng Leng Zhijun Li Cheng He Qiang Tan Qian Xu J.Hugh Horton Li Li Junfa Zhu 《Nano Research》 SCIE EI CSCD 2022年第7期5912-5921,共10页
Catalytic C−H bond activation is one of the backbones of the chemical industry.Supported metal subnanoclusters consisting of a few atoms have shown attractive properties for heterogeneous catalysis.However,the creatio... Catalytic C−H bond activation is one of the backbones of the chemical industry.Supported metal subnanoclusters consisting of a few atoms have shown attractive properties for heterogeneous catalysis.However,the creation of such catalyst systems with high activity and excellent anti-sintering ability remains a grand challenge.Here,we report on alkali ion-promoted Pd subnanoclusters supported over defectiveγ-Al2O3 nanosheets,which display exceptional catalytic activity for C−H bond activation in the benzene oxidation reaction.The presence of Pd subnanoclusters is verified by aberration-corrected high-angle annular dark-field scanning transmission electron microscopy,X-ray absorption spectroscopy,and X-ray photoelectron spectroscopy.This catalyst shows excellent catalytic activity,with a turnover frequency of 280 h−1 and yield of 98%,in benzene oxidation reaction to give phenol under mild conditions.Moreover,the introduction of alkali ion greatly retards the diffusion and migration of metal atoms when tested under high-temperature sintering conditions.Density functional theory(DFT)calculations reveal that the addition of alkali ion to Pd nanoclusters can significantly impact the catalyst’s structure and electronic properties,and eventually promote its activity and stability.This work sheds light on the facile and scalable synthesis of highly active and stable catalyst systems with alkali additives for industrially important reactions. 展开更多
关键词 Pd subnanoclusters γ-Al2O3nanosheets heterogeneous catalysis benzene oxidation catalytic activity
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Lefschetz decomposition for de Rham cohomology on weakly Lefschetz symplectic manifolds 认领 引用
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作者 Qiang TAN Haifeng XU 《Frontiers of Mathematics in China》 SCIE CSCD 2015年第5期1169-1178,共10页
For a compact symplectic manifold which is s-Lefschetz which is weaker than the decomposition for de hard Lefschetz property, we prove that the Lefschetz Rham cohomology also holds.
关键词 Symplectic manifold s-Lefschetz Lefschetz decomposition,s-dd-lemma
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Remarks on Some Compact Symplectic Solvmanifolds 认领 引用
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作者 Qiang TAN Adriano TOMASSINI 《Acta Mathematica Sinica,English Series》 SCIE CSCD 2023年第10期1874-1886,共13页
We study the hard Lefschetz property on compact symplectic solvmanifolds,i.e.,compact quotients M=ΓG of a simply-connected solvable Lie group G by a latticeΓ,admitting a symplectic structure.
关键词 Symplectic solvmanifold Hard Lefschetz Condition
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On Tamed Almost Complex Four‑Manifolds 认领 引用 被引量：1
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作者 Qiang Tan Hongyu Wang +1 位作者 Jiuru Zhou Peng Zhu 《Peking Mathematical Journal》 CSCD 2022年第1期37-152,共116页
This paper proves that on any tamed closed almost complex four-manifold(M,J)whose dimension of J-anti-invariant cohomology is equal to the self-dual second Betti number minus one,there exists a new symplectic form com... This paper proves that on any tamed closed almost complex four-manifold(M,J)whose dimension of J-anti-invariant cohomology is equal to the self-dual second Betti number minus one,there exists a new symplectic form compatible with the given almost complex structure J.In particular,if the self-dual second Betti number is one,we give an affirmative answer to a question of Donaldson for tamed closed almost complex four-manifolds.Our approach is along the lines used by Buchdahl to give a unified proof of the Kodaira conjecture. 展开更多
关键词 ω-Tame(compatible)almost complex structure J-Anti-invariant cohomology Positive(1,1)current Local symplectic property J-Holomorphic curve
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