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220篇 您的检索式:作者名="Kuan Chen"
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1Assessment of left ventricular systolic synchronicity by real-time three-dimensional echocardiography in patients with dilated cardiomyopathy显示文摘Background Recent advances in real-time three-dimensional echocardiography (RT3DE) offer the potential to assess the left ventricular (LV) dyssynchrony simultaneously by analyzing the 17 segments time-volume curves. The purpose of this study was to test the feasibility and accuracy of RT3DE for quantitative evaluation of left ventricular systolic synchronicity. Methods Twenty-four patients with dilated cardiomyopathy (DCM) and twenty-five healthy volunteers were enrolled in this study. Full volume RT3DE was performed by using Philips IE33 with X3-1 probe. The global and 17-segmental time-volume curves were obtained by the on-line Qlab software (version 4.2). The time to minimal systolic volume in each segment (Tmsv) was taken to derive the following indexes of systolic asynchrony: Tmsv 16-SD, Tmsv 16-Dif, Tmsv 12-SD, Tmsv 12-Dif, Tmsv 6-SD and Tmsv 6-Dif, which meant the standard deviation or the maximal difference of Tmsv among the 16, 12 and 6 segments of the left ventricle respectively. The software also provided with each of the above parameters as a percentage of the cardiac cycle. Results Tmsv 16-SD, Tmsv 12-SD and Tmsv 6-SD were all significantly larger in the DCM group than those of the control group [Tmsv 16-SD: (52.9±40.6) ms vs (8.8±6.2) ms; Tmsv 12-SD: (29.5±30.8) ms vs (6.9±4.0) ms; Tmsv 6-SD: (28.9±34.6) ms vs (7.0±4.7) ms, all P≤0.001]. Tmsv 16-Dif, Tmsv 12-Dif and Tmsv 6-Dif were also significantly larger in the DCM group. There were close negative relations between the LVEF determined by RT3DE and each of the indexes of systolic asynchrony, among which the indexes of Tmsv-16-SD% and Tmsv-16-Dif% correlated most closely (r=-0.703 and r =-0.701, respectively). The DCM patients had significantly larger EDV and ESV, with significantly reduced LVEF compared with the healthy subjects. Conclusion RT3DE provides a simple, useful and unique approach to assess the systolic synchronicity of all the left ventricular segments simultaneously.ZENG Xin SHU Xian-hong PAN Cui-zhen CHEN Rui-zhen CHENG Kuan LIU Shi-zhen CHEN Hao-zhu 2006Chinese Medical Journal2006,,11:16
2Recovery of heavy metals from electroplating sludge and stainless steel pickle waste liquid by ammonia leaching method显示文摘A coordinative disposal process for treatment of electroplating sludge and stainless steel pickle waste liquid containing Cu, Ni, Zn, Cr and Fe etc., has been developed to recover valuable metals and to eliminate pollution. The recovery of Cu, Ni, Zn and Cr is 94%, 91%, 90% and 95%, respectively. The ammonia was recycled by the simplified process of CaO caustic distillation. The precipitated product of Cu, Ni and Zn obtained from caustic distillation of ammonia was separated by extraction or high\|pressure hydrogen reduction in an autoclave. The qualified metal salt products were obtained through extraction. The rich chromium residue from coordinative disposal was subjected to recover Cr by hydrothermal oxidation in NaOH medium and Fe\-3O\-4 was synthesized by wet methods from the residue produced by extracting Cr. Cr was a stable chemical fixed in Fe\-3O\-4 and harmless. The recovery process has been used in a pilot plant with sludge production capacity of 2000 t/a.Zhang Yi, Wang Zhi\|kuan, Xu Xia, Chen Yong\|qi, Qi Tao Institute of Chemical Metallurgy, Chinese Academy of Sciences,P.O. Box 353, Beijing 100080, China 1999Journal of Environmental Sciences1999,11,3:15
3Protective effects of luteolin against lipopolysaccharide-induced acute lung injury involves inhibition of MEK/ERK and PI3K/Akt pathways in neutrophils显示文摘Jen-pei LEE Yi-ching LI Hung-yi CHEN Ruey-hseng LIN Shiang-suo HUANG Hui-ling CHEN Pai-chuan KUAN Mao-fang LIAO Chun-jung CHEN Yu-hsiang KUAN 2010Acta Pharmacologica Sinica2010,31,7:12
4Toughening Poly(lactic acid) with Imidazolium-based Elastomeric Ionomers显示文摘Imidazolium-based elastomeric ionomers(i-BIIR) were facilely synthesized by ionically modified brominated poly(isobutylene-co-isoprene)(BIIR) with different alkyl chain imidazole and thoroughly explored as novel toughening agents for poly(lactic acid)(PLA). The miscibility, thermal behavior, phase morphology and mechanical property of ionomers and blends were investigated through dynamic mechanical analyses(DMA), differential scanning calorimetry(DSC), scanning electron microscopy(SEM), tensile and impact testing. DMA and SEM results showed that better compatibility between the PLA and i-BIIR was achieved compared to the PLA/unmodified BIIR elastomer. A remarkable improvement in ductility with an optimum elongation at break up to235% was achieved for the PLA/i-BIIR blends with 1-dodecylimidazole alkyl chain(i-BIIR-12), more than 10 times higher than that of pure PLA. The impact strengths of PLA were enhanced from 1.9 kJ/m^2 to 4.1 kJ/m^2 for the PLA/10 wt% i-BIIR-12 blend. Toughening mechanism had been established by systematical analysis of the compatibility, intermolecular interaction and phase structures of the blends. Interfacial cavitations initiated massive shear yielding of the PLA matrix owing to a suitable interfacial adhesion which played a key role in the enormous toughening effect in these blends. We believed that introducing imidazolium group into the BIIR elastomer was vital for the formation of a suitable interfacial adhesion.Lu Chen Kuan Hu Si-Ting Sun Hai Jiang Dong Huang Kun-Yu Zhang Li Pan Yue-Sheng Li 2018Chinese Journal of Polymer Science2018,36,12:7
5Catalytic removal of phenol from gas streams by perovskite-type catalysts显示文摘Three perovskite-type catalysts prepared by citric acid method are applied to remove phenol from gas streams with the total flow rate of 300 mL/min, corresponding to a GHSV of10,000/hr. LaMnO_3 catalyst is first prepared and further partially substituted with Sr and Cu to prepare La_(0.8)Sr_(0.2)MnO_3 and La_(0.8)Sr_(0.2)Mn_(0.8)Cu_(0.2)O_3, and catalytic activities and fundamental characteristics of these three catalysts are compared. The results show that phenol removal efficiency achieved with La_(0.8)Sr_(0.2)Mn_(0.8)Cu_(0.2)O_3 reaches 100% with the operating temperature of 200°C and the rate of mineralization at 300°C is up to 100%, while the phenol removal efficiencies achieved with La_(0.8)Sr_(0.2)MnO_3 and LaMnO_3 are up to 100% with the operating temperature of 300°C and 400°C, respectively. X-ray photoelectron spectroscopy(XPS) analysis shows that the addition of Sr and Cu increases the lattice oxygen of La_(0.8)Sr_(0.2)Mn_(0.8)Cu_(0.2)O_3, and further increases mobility or availability of lattice oxygen. The results indicate that La_(0.8)Sr_(0.2)Mn_(0.8)Cu_(0.2)O_3 has the best activity for phenol removal among three catalysts prepared and the catalytic activity of phenol oxidation is enhanced by the introduction of Sr and Cu into LaMnO_3. Apparent activation energy of 48 k J/mol is calculated by Mars–Van Krevelen Model for phenol oxidation with La_(0.8)Sr_(0.2)Mn_(0.8)Cu_(0.2)O_3 as catalyst.Dai Ling Chen Kuan Lun Pan Moo Been Chang 2017Journal of Environmental Sciences2017,29,6:5
6m6A promotes R-loop formation to facilitate transcription termination显示文摘R-loops are three-stranded nucleic acid structures consisting of a DNA:RNA heteroduplex and a displaced single DNA strand.They constitute a prevalent genomic feature with important functions in all kingdoms of eukaryotes.1,2,3 For example,R-loops have been found over unmethylated CpG island promoters,G-rich terminators,and many other regulatory chromosomal loci.2,3 Moreover,they are essential for diverse cellular processes,such as immunoglobulin class switching,mitotic chromosome segregation,4 DNA replication and repair,genome stability regulation,5 as well as in multiple steps during transcription.6,7 R-loops can be formed both in cis and in trans;cis R-loops are formed between a nascent RNA and its DNA template following transcribing RNA polymerases and exert co-transcriptional regulatory effects.3,8 Therefore,it is important to control their formation and resolution,and many external factors have already been identified for this process.7 However,it is still unknown whether the intrinsic properties of the RNA itself,such as various modifications,can modulate the formation of DNA:RNA hybrids.Xin Yang Qian-Lan Liu Wei Xu Yi-Chang Zhang Ying Yang Lin-Fang Ju Jing Chen Yu-Sheng Chen Kuan Li Jie Ren Qianwen Sun Yun-Gui Yang 2019Cell Research2019,29,12:5
7MATRIEX imaging:multiarea two-photon real-time in vivo explorer显示文摘Two-photon laser scanning microscopy has been extensively applied to study in vivo neuronal activity at cellular and subcellular resolutions in mammalian brains.However,the extent of such studies is typically confined to a single functional region of the brain.Here,we demonstrate a novel technique,termed the multiarea two-photon real-time in vivo explorer(MATRIEX),that allows the user to target multiple functional brain regions distributed within a zone of up to 12mm in diameter,each with a field of view(FOV)of ~200μm in diameter,thus performing two-photon Ca2+imaging with single-cell resolution in all of the regions simultaneously.For example,we demonstrate real-time functional imaging of single-neuron activities in the primary visual cortex,primary motor cortex and hippocampal CA1 region of mice in both anesthetized and awake states.A unique advantage of the MATRIEX technique is the configuration of multiple microscopic FOVs that are distributed in three-dimensional space over macroscopic distances(>1 mm)both laterally and axially but that are imaged by a single conventional laser scanning device.In particular,the MATRIEX technique can be effectively implemented as an add-on optical module for an existing conventional single-beam-scanning two-photon microscope without requiring any modification to the microscope itself.Thus,the MATRIEX technique can be readily applied to substantially facilitate the exploration of multiarea neuronal activity in vivo for studies of brain-wide neural circuit function with single-cell resolution.Mengke Yang Zhenqiao Zhou Jianxiong Zhang Shanshan Jia Tong Li Jiangheng Guan Xiang Liao Bing Leng Jing Lyu Kuan Zhang Min Li Yan Gong Zhiming Zhu Junan Yan Yi Zhou Jian K Liu Zsuzsanna Varga Arthur Konnerth Yuguo Tang Jinsong Gao Xiaowei Chen Hongbo Jia 2019Light(Science & Applications)2019,8,1:4
8The first power generation test of hot dry rock resources exploration and production demonstration project in the Gonghe Basin,Qinghai Province,China显示文摘Hot dry rock(HDR)is a kind of clean energy with significant potential.Since the 1970s,the United States,Japan,France,Australia,and other countries have attempted to conduct several HDR development research projects to extract thermal energy by breaking through key technologies.However,up to now,the development of HDR is still in the research,development,and demonstration stage.An HDR exploration borehole(with 236℃ at a depth of 3705 m)was drilled into Triassic granite in the Gonghe Basin in northwest China in 2017.Subsequently,China Geological Survey(CGS)launched the HDR resources exploration and production demonstration project in 2019.After three years of efforts,a sequence of significant technological breakthroughs have been made,including the genetic model of deep heat sources,directional drilling and well completion in high-temperature hard rock,large-scale reservoir stimulation,reservoir characterization,and productivity evaluation,reservoir connectivity and flow circulation,efficient thermoelectric conversion,monitoring,and geological risk assessment,etc.Then the whole-process technological system for HDR exploration and production has been preliminarily established accordingly.The first power generation test was completed in November 2021.The results of this project will provide scientific support for HDR development and utilization in the future.Er-yong Zhang Dong-guang Wen Gui-ling Wang Wei-de Yan Wen-shi Wang Cheng-ming Ye Xu-feng Li Huang Wang Xian-chun Tang Wei Weng Kuan Li Chong-yuan Zhang Ming-xing Liang Hong-bao Luo Han-yue Hu Wei Zhang Sen-qi Zhang Xian-peng Jin Hai-dong Wu Lin-you Zhang Qing-da Feng Jing-yu Xie Dan Wang Yun-chao He Yue-wei Wang Zu-bin Chen Zheng-pu Cheng Wei-feng Luo Yi Yang Hao Zhang En-lai Zha Yu-lie Gong Yu Zheng Chang-sheng Jiang Sheng-sheng Zhang Xue Niu Hui Zhang Li-sha Hu Gui-lin Zhu Wen-hao Xu Zhao-xuan Niu Li Yang 2022China Geology2022,5,3:4
9Soluble Polyimide-reinforced TGDDM and DGEBA Epoxy Composites显示文摘Polyimide(PI)synthesized from aromatic diamine and dianhydrides via two-step poly-condensation method was highly soluble in TGDDM(MY-720)and DGEBA(E-51)at desirable temperature.TGDDM-PI(M-PI)and DGEBA-PI(E-PI)composites within 0.5%-3%PI loading could be prepared without organic solvent.On the cryogenically fractured surfaces of M-PI and E-PI composites,no obvious heterogeneous phase was observed by SEM.The mechanical properties were promoted significantly by PI,especially for impact strength.Adding 2%PI-2W into MY-720 and E-51 composites,the impact strength increased to 21 and 51 kJ/m2,the tensile strength increased by 62%and 19%,and the flexural strength by 18%and 13%,respectively,with slight increases in tensile modulus.These results were related to the promotion in plasticity of composites and changes in fragile→ductile fracture mode.Moreover,Tg and thermal stability of M-PI and E-PI were increased effectively.Qi Chen Shun Wang Feng Qin Kuan Liu Qian Liu Qing Zhao Xing-Yi Wang Yan-Hong Hu 2020Chinese Journal of Polymer Science2020,38,8:3
10IL-29 promoted obesity-induced inflammation and insulin resistance显示文摘Adipocyte-macrophage crosstalk plays a critical role to regulate adipose tissue microenvironment and cause chronic inflammation in the pathogenesis of obesity.Interleukin-29(IL-29),a member of type 3 interferon family,plays a role in host defenses against microbes,however,little is known about its role in metabolic disorders.We explored the function of IL-29 in the pathogenesis of obesity-induced inflammation and insulin resistance.We found that serum IL-29 level was significantly higher in obese patients.IL-29 upregulated IL-1β,IL-8,and monocyte chemoattractant protein-1(MCP-1)expression and decreased glucose uptake and insulin sensitivity in human Simpson-Golabi-Behmel syndrome(SGBS)adipocytes through reducing glucose transporter 4(GLUT4)and AKT signals.In addition,IL-29 promoted monocyte/macrophage migration.Inhibition of IL-29 could reduce inflammatory cytokine production in macrophage-adipocyte coculture system,which mimic an obese microenvironment.In vivo,IL-29 reduced insulin sensitivity and increased the number of peritoneal macrophages in high-fat diet(HFD)-induced obese mice.IL-29 increased M1/M2 macrophage ratio and enhanced MCP-1 expression in adipose tissues of HFD mice.Therefore,we have identified a critical role of IL-29 in obesity-induced inflammation and insulin resistance,and we conclude that IL-29 may be a novel candidate target for treating obesity and insulin resistance in patients with metabolic disorders.Tian-Yu Lin Chiao-Juno Chiu Chen-Hsiang Kuan Fang-Hsu Chen Yin-Chen Shen Chih-Hsing Wu Yu-Hsiang Hsu 2020Cellular & Molecular Immunology2020,17,4:3
11Liver resection for hepatocellular carcinoma larger than 10 cm: A multi-institution long-term observational study显示文摘BACKGROUND The treatment of hepatocellular carcinoma(HCC)≥10 cm remains a challenge.AIM To consolidate the role of surgical resection for HCC larger than 10 cm.METHODS Eligible HCC patients were identified from the Chang Gung Research Database,the largest multi-institution database,which collected medical records of all patients from Chang Gung Memorial Foundation.The surgical outcome of HCC≥10 cm(L-HCC)was compared to that of HCC<10 cm(S-HCC)(model 1).The survival of L-HCC after either liver resection or transarterial chemoembolization(TACE)was also analyzed(model 2).The long-term risks of all-cause mortality and recurrence were assessed to consolidate the role of surgery for L-HCC.RESULTS From January 2004 to July 2015,a total of 32403 HCC patients were identified from the Chang Gung Research Database.Among 3985 patients who received liver resection,3559(89.3%)had S-HCC,and 426 had L-HCC.The L-HCC patients had a worse disease-free survival(0.27 for L-HCC vs 0.40 for S-HCC)and overall survival(0.18 for L-HCC vs 0.45 for S-HCC)than the S-HCC after liver resection(both P<0.001).However,the surgical and long-term outcome of resected L-HCC had improved dramatically in the recent decades.After adjusting for covariates,surgery could provide a better outcome for L-HCC than TACE(adjusted hazard ratio of all-cause mortality:0.46,95%confidence interval:0.38-0.56 for surgery).Subgroup analysis stratified by different stages showed similar trend of survival benefit among L-HCC patients receiving surgery.CONCLUSION Our study demonstrated an improving surgical outcome for HCC larger than 10 cm.Under selected conditions,surgery is better than TACE in terms of disease control and survival and should be performed.Due to inferior survival,a subclassification within T1 stage should be considered.Future studies are mandatory to confirm our findings.Chao-Wei Lee Ming-Chin Yu Chih-Chi Wang Wei-Chen Lee Hsin-I Tsai Feng-Che Kuan Chun-Wei Chen Yi-Chung Hsieh Hsing-Yu Chen 2021World Journal of Gastrointestinal Surgery2021,13,5:2
12Nonvolatile reconfigurable dynamic Janus metasurfaces in the terahertz regime显示文摘Metasurfaces,especially tunable ones,have played a major role in controlling the amplitude,phase,and polarization of electromagnetic waves and attracted growing interest,with a view toward a new generation of miniaturized devices.However,to date,most existing reconfigurable devices are bounded in volatile nature with sustained external energy to maintain and single functionality,which restrict their further applications.Here,we demonstrate for the first time,to our knowledge,nonvolatile,reconfigurable,and dynamic Janus metasurfaces by incorporating phase-change material Ge_(2)Se_(2)Te_(5)(GST)in the terahertz(THz)regime.First,we experimentally show the reversible switching characteristic of GST on large areas by applying a single nanosecond laser pulse,which exhibits excellent contrast of THz properties in both states.Then,we present a multiplex metasurface scheme.In each metasurface,three sets of structures are adopted,in which two sets integrate GST.The effective structures can be reversely modulated by the amorphization and crystallization of GST.As a proof of concept,the dynamic beam splitter,bifocal metalens,dual-mode focusing optical vortex generators,and switchable metalens/focusing optical vortex generators are designed,fabricated,and experimentally characterized,and can be switched reversibly and repeatedly with the help of optical and thermal stimuli.Our scheme will pave the way toward the development of multifunctional and compact THz devices and may find use for applications in THz imaging,sensing,and communications.SHOUJUN ZHANG XIEYU CHEN KUAN LIU HAIYANG LI YUEHONG XU XIAOHAN JIANG YIHAN XU QINGWEI WANG TUN CAO ZHEN TIAN 2022Photonics Research2022,10,7:2
13Surfactant-assisted fabrication of graphene frameworks endowing epoxy composites with superior thermal conductivity显示文摘With the rapid growth in electronic device performance,there has been an increasing demand for thermally conductive polymer composites to handle the thermal management issue,thus contributing to the great importance to develop the graphene framework,which is evaluated as the most promising reinforcements for enhancing the thermal conductivity of polymer.Vacuum filtration is a common method to fabricate graphene framework,whereas,it is available to prepare a framework with centimeter-scale thickness by filtrating the graphene-water dispersion,due to the fact of sample cracking caused by the mismatch of surface tension between graphene and water.In this work,a surfactantassisted strategy was proposed by adjusting the surface tension of the water close to that of graphene first,then performing a conventional filtration process,to fabricate graphene framework.As a result,a thick graphene framework(thickness:3 cm)was successfully prepared,and after embedding into epoxy,the framework endows the composite(13.6 wt%)with a high in-plane thermal conductivities of12.4 W/mK,which is equivalent to≈64 times higher than that of neat epoxy.Our method is simple and compatible with the conventional filtration process,suggesting great potential for the mass-production of graphene framework to meet the practical application requirements.Fan Zhang Chen Ye Wen Dai Le Lv Qilong Yuan Kuan W.A.Chee Ke Yang Nan Jiang Cheng-Te Lin Zhaolin Zhan Dan Dai He Li 2020Chinese Chemical Letters2020,31,1:2
14Recent advances in the synthesis of nanoscale hierarchically porous metal–organic frameworks显示文摘Nanoscale hierarchically porous metal–organic frameworks(NHP-MOFs)have received unprecedented attention in many fields owing to their integration of the strengths of nanoscale size(<1μm)and hierarchical porous structure(micro-,meso-and/or macro-pores)of MOFs.This review focuses on recent advances in the main synthetic strategies for NHP-MOFs based on different metal ions(e.g.,Cu,Fe,Co,Zn,Al,Zr,and Cr),including the template method,composite technology,post-synthetic modification,in situ growth and the grind method.In addition,the mechanisms of synthesis,regulation techniques and the advantages and disadvantages of various methods are discussed.Finally,the challenges and prospects of the commercialisation of promising NHP-MOFs are also presented.The purpose of this review is to provide a road map for future design and development of NHP-MOFs for practical application.Chongxiong Duan Kuan Liang Zena Zhang Jingjing Li Ting Chen Daofei Lv Libo Li Le Kang Kai Wang Han Hu Hongxia Xi 2022Nano Materials Science2022,4,4:2
15Hepatic Cyp1a2 Expression Reduction during Inflammation Elicited in a Rat Model of Intermittent Hypoxia显示文摘Li-Xia Shi Xing Wang Qi Wu Xin Sun Zhen Wan Li Li Kuan Li Xue Li Yu Li Qiu-Yang Zhang Jun-Ping Wu Huai-Yong Chen 2017Chinese Medical Journal2017,,21:2
16Test results of a bi-directional thermodiode system for solar energy utilization显示文摘WONGEE CHUN KUAN CHEN 2002Solar Energy2002,73,:1
17Preparation,electrical,mechanical and thermal properties of composite bipolar plate for a fuel cell显示文摘KUAN H C MAC C M CHEN K H 2004Journal of Power Sources2004,134,:1
18A novel defensin encoded by a mungbean eDNA exhibits insecticidal activity against bruchid 显示文摘Chen K C Lin C Y Kuan C C 2002J Agric Food Chem2002,50,:1
19Expression of C-X-C chemokine receptor types 1/2 in patients with gastriccarcinoma: Clinicopathological correlations and significance显示文摘Jun Wang Wan Hu Kuan Wang Jun Yu Bai Luo Chang Wu Zhi Chen Geng Luo Yu Liu Qin Liu Yan Xiao Hai Zhou Xiao Yang Hai Jiang Jing Li Ji Wen 2013Oncology Letters2013,,2:1
20Signifcance of left atrial spontanous echo contrast in rheumatic mitral valve disease as a predictor of systemic artrial embolization:A transesophageal echocardiographic study显示文摘Hwang JJ Kuan P Chen JJ 1994Am Heart J1994,127,4:1
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