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16篇 您的检索式:作者名="Qiujun Li"
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1A deep stratospheric intrusion associated with an intense cut-off low event over East Asia显示文摘European Centre for Medium-Range Weather Forecasts Re-Analysis Interim(ERA-Interim)reanalysis data and satellite data,and trajectory model were applied to analyze the dynamical,thermo-dynamical,and chemical structure in the upper troposphere and lower stratosphere(UTLS)of an intense cut-off low(COL)event occurring over East Asia during June 19-23,2010,and to characterize the process and transport pathway of deep stratospheric intrusion.The Atmospheric Infrared Sounder(AIRS)ozone data and the Global Positioning System Ozone(GPSO3)sonde data showed that the air mass originating from the polar formed a region with relatively high values of potential vorticity(PV)and ozone in the center of COL,and a secondary ozone peak appeared in the upper troposphere during mature stage of the COL.Forward trajectory simulation suggested that during the first stage of COL,deep stratospheric intrusion associated with strong northerly wind jet on the west side of the upper-level trough transported ozone-rich air from the polar lower stratosphere into the middle and lower troposphere in the mid-latitude,and increased the ozone concentration there.During the mature stage of the COL,stratospheric air was transported counterclockwise into the troposphere.Backward trajectory model was used to find the source regions of air mass within the COL during its mature stage.Model results show that air masses with high ozone concentration in the center of the COL have two source regions:one is the subpolar vortex which lies in northern part of Center Siberia,where ozone-rich air plays a major role in increasing the ozone concentrations,and the other is the strong shear region which is near by the cyclonic side of the extratropical jet axis(west of 90°E,near 50°N).The air masses with low ozone concentration around the COL also have two source regions:one is the anticyclonic side of the extratropical jet axis,where the air mass with the relatively low ozone concentration at the bottom of the COL is mainly controlled by horizontal movement,and the other is the warm area of the south side of COL,where the air mass on the east and west side of the COL is mainly dominated by upward motion.LI Dan BIAN JianChun FAN QiuJun 2015Science China Earth Sciences2015,58,1:10
2Bamboo Leaf and Pollen Fossils from the Late Miocene of Eastern Zhejiang,China and their Phytogeological Significance显示文摘Fossil bamboo leaves and pollen from Upper Miocene deposits of the Shengxian Formation in Tiantai and Ninghai counties,eastern Zhejiang,China represent a rare record in Asia.The distinctive pseudopetiole and parallel venation of the leaf blades and the clearly thickened annulus of the pollen aperture place them in the subfamily Bambusoideae.Morphological analysis supports the determination of these fossil leaves as belonging to the genus Bambusium and two new species are described.Bambusium latipseudopetiolus Q.J.Wang et B.N.Sun sp.nov.has a distinctly wide pseudopetiole of 0.23 cm in width and 0.40 cm in length,several vascular bundles on parallel veins,and 5–8 lateral veins on both sides of the midrib.Bambusium longipseudopetiolus Q.J.Wang et B.N.Sun sp.nov.has a distinctly long pseudopetiole of 0.60 cm in length and 0.10 cm in width,several vascular bundles on the pseudopetiole,and 6 lateral veins on both sides of the midrib.Pollen grains from the same layer provide additional evidence of bamboos.They are characterized by 32.0–51.0 μm in diameter,a round pore 3.0–4.0 μm in diameter with a broad thickened annulus 2.5–3.5 μm around,and several conspicuous secondary folds on the exine surface.The morphological analysis leads to their assignment to Graminidites bambusoides Stuchlik.These fossils are important for the study of bamboo phytogeography in China.They demonstrate that there were bamboos growing in southeastern China during the Late Miocene and that bamboos in Zhejiang begin to diversify no later than the Late Miocene.In combination with bamboo fossils from other places,it seems that bamboos had a wide distribution across southern China during the Miocene,ranging from southwestern Yun'nan to southeastern Zhejiang.WANG Qiujun MA Fujun YANG Yi DONG Junling WANG Haofei LI Ruiyun XU Xiaohui SUN Bainian 2014Acta Geologica Sinica(English Edition)2014,88,4:7
3New Schizolepis Fossils from the Early Cretaceous in Inner Mongolia, China and its Phylogenetic Position显示文摘Three Schizolepis species collected from the Lower Cretaceous layer of the Huolinhe Basin,Inner Mongolia,China are described.These fossils are Schizolepis longipetiolus Xu XH et Sun BN sp.nov.,which is a new species,Schizolepis cf.heilongjiangensis Zheng et Zhang,and Schizolepis neimengensis Deng.The new species is a well-preserved female cone,slender and cylindrical in shape.The seed–scale complexes have long petioles and are arranged on the cone axis loosely and helically.The seed scales are divided into two lobes from the base.Each lobe is semicircular or elongate ligulate in shape,widest at the middle or the lower middle part,with an obtuse or bluntly pointed apex.The inner margin is almost straight and the outer margin is strongly arched.On the surface of the lobe,there are longitudinal and somewhat radial striations from the base to the margin.The seed is borne on the adaxial surface at the base or middle of each lobe.Schizolepis was established in 1847,and,although more than twenty species have been discovered and reported,its phylogenetic position is controversial because of the imperfection of fossils.Most authors have considered there to be a close evolutionary relationship between Schizolepis and extant Pinaceae.Here,we analyze characteristics and compare Schizolepis with Picea crassifolia Kom,which is morphologically most similar to Schizolepis.The results indicate that the genus probably has a distant evolutionary relationship with extant Pinaceae.A detailed statistical analysis of the global paleogeographic distribution of Schizolepis showed that all the fossils of this genus appeared in strata ranging from the Upper Triassic to the Lower Cretaceous in the North Hemisphere,being rare in the Upper Triassic and Lower Jurassic,but being very common from the Middle Jurassic to the Lower Cretaceous,and particularly abundant in the Lower Cretaceous.According to the statistical results,we speculate that the genus originated in Europe in the Late Triassic then spread from Europe to Asia between the Late Triassic and the Late Jurassic.In the Early Cretaceous most species existed in China's three northeastern Provinces and the Inner Mongolia Autonomous Region and adjacent areas.Combining the paleogeographic distribution of the genus with ancient climatic factors,we deduced that Schizolepis began to decline and became extinct in the Early Cretaceous,and the reason for its extinction is closely related to the icehouse climate during the Early Cretaceous.XU Xiaohui LI Ruiyun DONG Chong WANG Qiujun JIN Peihong SUN Bainian 2013Acta Geologica Sinica(English Edition)2013,87,5:5
4A high over-potential binder-free electrode constructed of Prussian blue and MnO2 for high performance aqueous supercapacitors显示文摘Extending the potential window of aqueous supercapacitors (SCs) up to 2.0 V is still a great challenge.Based on their good dynamic structural reversibility and open framework structure,the coordination superamolecular networks (CSNs) exhibit rapid charge/discharge ability and excellent cycle stability.As a typical coordination superamolecular network (CSN),Prussian blue (denoted as CSN-PB),which self-assembled by the CN-ligand and iron ions is firstly in-situ grown on carbon cloth,followed by electro-deposition of MnO2 to form CSN-PB/MnO2 composite electrode.Benefiting from synergistic effect of the constituent components,as well as the open framework structure of CSN-PB,this composite electrode reaches a high potential window of 1.4 V (vs.Ag/AgCl) and delivers a good specific capacitance of 315.3 F·g^-1 in aqueous electrolyte.An aqueous asymmetric device,constructed with CSN-PB/MnO2 composite as cathode and activated carbon as anode,can work in a stable potential window of 2.4 V,exhibits a high energy density of 46.13 Wh·kg^-1 and excellent cycling stability with 85.5% capacitance retention after 20,000 cycles.This work provides a new concept of high dynamic structural reversibility from CSNs to increase the cell voltage of asymmetric SCs for further boosting energy density.Gaowei Zhang Hua Yao Feng Zhang Zitao Gao Qiujun Li Yangyi Yang Xihong Lu 2019Nano Research2019,12,5:5
53.6 W compact all-fiber Pr3+-doped green laser at 521 nm显示文摘Green semiconductor lasers are still undeveloped,so high-power green lasers have heavily relied on nonlinear frequency conversion of near-infrared lasers,precluding compact and low-cost green laser systems.Here,we report the first Watt-level all-fiber CW Pr3t-doped laser operating directly in the green spectral region,addressing the aforementioned difficulties.The compact all-fiber laser consists of a double-clad Pr3t-doped fluoride fiber,two homemade fiber dichroic mirrors at visible wavelengths,and a 443-nm fiber-pigtailed pump source.Benefitting from>10 MW∕cm2 high damage intensity of our designed fiber dielectric mirror,the green laser can stably deliver 3.62-W of continuous-wave power at∼521 nm with a slope efficiency of 20.9%.To the best of our knowledge,this is the largest output power directly from green fiber lasers,which is one order higher than previously reported.Moreover,these green all-fiber laser designs are optimized by using experiments and numerical simulations.Numerical results are in excellent agreement with our experimental results and show that the optimal gain fiber length,output mirror reflectivity,and doping level should be considered to obtain higher power and efficiency.This work may pave a path toward compact high-power green all-fiber lasers for applications in biomedicine,laser display,underwater detection,and spectroscopy.Jinhai Zou Jinfen Hong Zhuang Zhao Qingyuan Li Qiujun Ruan Hang Wang Yikun Bu Xianchao Guan Min Zhou Zhiyong Feng Zhengqian Luo 2022Advanced Photonics2022,4,5:2
6Cardiac-derived adiponectin induced by long-term insulin treatment ameliorates myocardial ischemia/reperfusion injury in type 1 diabetic mice via AMPK signaling显示文摘Haifeng Pei Yan Qu Xiaoyan Lu Qiujun Yu Kun Lian Peilin Liu Wenjun Yan Jingyi Liu Yanzhuo Ma Yi Liu Chengxiang Li Weijie Li Wayne Bond Lau Haifeng Zhang Ling Tao 2013Basic Research in Cardiology2013,,1:1
7IFI16 mis-localization can be a contributing factor to hepatocellular carcinoma progression显示文摘Xinli Shi Jingli Liu Qiujun Liu Mingyuan Li 2014Medical Hypotheses2014,,:1
8Direct generation of 3.17 mJ green pulses in a cavity-dumped Ho^(3+)-doped fiber laser at 543 nm显示文摘High-energy pulsed lasers in the green spectral region are of tremendous interest for applications in space laser ranging,underwater detection,precise processing,and scientific research.Semiconductor pulsed lasers currently are difficult to access to the so-called“green gap,”and high-energy green pulsed lasers still heavily rely on the nonlinear frequency conversion of near-IR lasers,precluding compact and low-cost green laser systems.Here,we address this challenge by demonstrating,for the first time to the best of our knowledge,millijoule-level green pulses generated directly from a fiber laser.The green pulsed fiber laser consists of a 450 nm pump laser diode,a Ho^(3+)-doped ZBLAN fiber,and a cavity-dumping module based on a visible wavelength acousto-optic modulator.Stable pulse operation in the cavity-dumping regime at 543 nm is observed with a tunable repetition rate in a large range of 100 Hz–3 MHz and a pulse duration of 72–116 ns.The maximum pulse energy of 3.17 mJ at 100 Hz is successfully achieved,which is three orders of magnitude higher than those of the rare-earth-doped fiber green lasers previously reported.This work provides a model for compact,high-efficiency,and high-energy visible fiber pulsed lasers.TIANRAN LI ZIYU WANG JINHAI ZOU JINFEN HONG QIUJUN RUAN HANG WANG ZHIPENG DONG ZHENGQIAN LUO 2023Photonics Research2023,11,3:1
9Effect of Kupffer cells depletion on ABC phenomenon induced by Kupffer cells-targeted liposomes显示文摘Accelerated blood clearance(ABC) phenomenon is common in many PEGylated nanocarriers, whose mechanism has not been completely elucidated yet. In this study, the correlation between Kupffer cells(KCs) and ABC phenomenon has been studied by KCs-targeted liposomes inducing ABC phenomenon and KCs depletion. In other words, the 4-aminophenyl-α-D-mannopyranoside(APM) lipid derivative DSPE-PEG 2000-APM(DPM), and 4-aminophenyl-β-L-fucopyranoside(APF) lipid derivative DSPE-PEG 2000-APF(DPF) were conjugated and modified on alendronate sodium(AD) liposomes to specifically target and deplete KCs. The dualligand modified PEGylated liposomes(MFPL) showed stronger ability to damage KCs in vitro and in vivo, which also could indirectly illustrate that dual-ligand modification could better target KCs. Besides, the hepatic biodistribution and pharmacokinetics could directly prove that MFPL had a stronger targeting ability to KCs. In addition, in depletion rats, plasma concentration and splenic biodistribution of MFPL and PEGylated liposomes(PL) were significantly elevated and hepatic biodistribution was significantly reduced, which demonstrated that KCs played an important role on elimination of nanoparticles. What’s more, ABC phenomenon of the secondary injection of PL was stronger in KCs depletion rats than that in normal rats, which indicated that depletion of KCs prolonged the circulation of PL in the first injection repeatedly stimulating B-cells in the marginal region of the spleen and causing it to secrete more IgM antibodies. This could also illustrate that anti-PEG IgM takes up a major station compared with KCs. Most important of all, KCs-targeted liposomes could induce a stronger ABC phenomenon than PL in normal rats, which declared that based on the same IgM concentration, the more the KCs were stimulated, the stronger ABC phenomenon was induced. However, in depletion rats, this difference of ABC phenomenon between PL and MFPL could no more exist, further demonstrating that KCs could participate and play a certain role in the ABC phenomenon.Chaoyang Lai Cong Li Mengyang Liu Qiujun Qiu Xiang Luo Xinrong Liu Ling Hu Yihui Deng Yanzhi Song 2019Asian Journal of Pharmaceutical Sciences2019,14,4:1
10Selective ischemic-hemisphere targeting Ginkgolide B liposomes with improved solubility and therapeutic efficacy for cerebral ischemia-reperfusion injury显示文摘Cerebral ischemia-reperfusion injury(CI/RI)remains the main cause of disability and death in stroke patients due to lack of effective therapeutic strategies.One of the main issues related to CI/RI treatment is the presence of the blood-brain barrier(BBB),which affects the intracerebral delivery of drugs.Ginkgolide B(GB),a major bioactive component in commercially available products of Ginkgo biloba,has been shown significance in CI/RI treatment by regulating inflammatory pathways,oxidative damage,and metabolic disturbance,and seems to be a candidate for stroke recovery.However,limited by its poor hydrophilicity and lipophilicity,the development of GB preparations with good solubility,stability,and the ability to cross the BBB remains a challenge.Herein,we propose a combinatorial strategy by conjugating GB with highly lipophilic docosahexaenoic acid(DHA)to obtain a covalent complex GB-DHA,which can not only enhance the pharmacological effect of GB,but can also be encapsulated in liposomes stably.The amount of finally constructed Lipo@GB-DHA targeting to ischemic hemisphere was validated 2.2 times that of free solution in middle cerebral artery occlusion(MCAO)rats.Compared to the marketed ginkgolide injection,Lipo@GB-DHA significantly reduced infarct volume with better neurobehavioral recovery in MCAO rats after being intravenously administered both at 2 h and 6 h post-reperfusion.Low levels of reactive oxygen species(ROS)and high neuron survival in vitro was maintained via Lipo@GB-DHA treatment,while microglia in the ischemic brain were polarized from the pro-inflammatory M1 phenotype to the tissue-repairing M2 phenotype,which modulate neuroinflammatory and angiogenesis.In addition,Lipo@GB-DHA inhibited neuronal apoptosis via regulating the apoptotic pathway and maintained homeostasis by activating the autophagy pathway.Thus,transforming GB into a lipophilic complex and loading it into liposomes provides a promising nanomedicine strategy with excellent CI/RI therapeutic efficacy and industrialization prospects.Yang Li Miaomiao Zhang Shiyi Li Longlong Zhang Jisu Kim Qiujun Qiu Weigen Lu Jianxin Wang 2023Asian Journal of Pharmaceutical Sciences2023,18,2:1
11Production Situation and Development Trends of Hydrogen Peroxide in ChinaWu Guoquan, Li Cheng, Liu Shimei, Wu Qiujun, Wang Qingji, Liu Zonghai, Song Shuli, from Qingdao Soda Ash Industrial Co., Ltd. 2009China Chemical Reporter2009,,16:0
12A two-step strategy for constructing stable gel polymer electrolyte interfaces for long-life cycle lithium metal batteries显示文摘Due to the high reactivity between the lithium metal and traditional organic liquid electrolyte,the reaction of lithium metal electrode is usually uneven and there are also unexpected side reactions.Therefore,construction of a stable solid electrolyte interface(SEI)is highly essential to improve the performance of lithium metal anode.Herein,a sandwich-like gel polymer electrolyte(GPE)is accurately prepared by in-situ polymerization of Polyacrylonitrile(PAN)nanofiber membrane with trihydroxymethylpropyl trimethylacrylate(TMPTMA)and 1,6-hexanediol diacrylate(HDDA).The resulting GPE with a tightly cross-linked gel skeleton exhibits high ionic conductivity and electrochemical window of 5.6 V versus Li/Li^(+).In particular,the pretreatment of Li metal anode can improve the interfacial wettability,and the synergy of the chemically pretreated Li metal anode surface and the GPE can electrochemically in situ generate SEI with compositionally stable and fluorine-rich inorganic components.Owing to these unique advantages,the interfacial compatibility between the GPE and lithium metal is greatly improved.Meanwhile,the formed SEI can inhibit the formation of lithium dendrites,and decomposition of GPE would be alleviated.The assembled Li-FEC|GPE|LiFePO_(4) full cell shows a high initial discharge capacity of 157.1 mA h g^(-1),and maintains a capacity retention of 92.3%after 100 cycles at 0.2C.Qiujun Wang Pin Zhang Weiqi Zhu Di Zhang Zhaojin Li Huan Wang Huilan Sun Bo Wang Li-Zhen Fan 2022Journal of Materiomics2022,8,5:0
13TET1蛋白亚型转换调控DNA去甲基化和小鼠发育显示文摘文章简介DNA甲基化氧化酶TET蛋白在介导DNA去甲基化和调控个体发育中均起着非常重要的作用。但是,TET蛋白如何识别基因组中的催化位点仍然有待研究。本研究通过细致地观测转录组学数据,意外发现了TET蛋白家族成员TET1在小鼠不同发育时期中存在两个亚型。其中全长TET1亚型(TET1e)仅在小鼠早期胚胎、小鼠胚胎干细胞和原始生殖细胞中表达;Wenhao Zhang Weikun Xia Qiujun Wang Aaron J Towers Jiayu Chen Rui Gao Yu Zhang Chia-an Yen Ah Young Lee Yuanyuan Li Chen Zhou Kaili Liu Jing Zhang Tian-Peng Gu Xiuqi Chen Zai Chang Danny Leung Shaorong Gao Yong-hui Jiang 颉伟 2017科学新闻2017,19,4:0
14An injectable signal-amplifying device elicits a specific immune response against malignant glioblastoma显示文摘Despite exciting achievements with some malignancies,immunotherapy for hypoimmunogenic cancers,especially glioblastoma(GBM),remains a formidable clinical challenge.Poor immunogenicity and deficient immune infiltrates are two major limitations to an effective cancer-specific immune response.Herein,we propose that an injectable signal-amplifying nanocomposite/hydrogel system consisting of granulocyte-macrophage colony-stimulating factor and imiquimod-loaded antigen-capturing nanoparticles can simultaneously amplify the chemotactic signal of antigen-presenting cells and the'danger'signal of GBM.We demonstrated the feasibility of this strategy in two scenarios of GBM.In the first scenario,we showed that this simultaneous amplification system,in conjunction with local chemotherapy,enhanced both the immunogenicity and immune infiltrates in a recurrent GBM model;thus,ultimately making a cold GBM hot and suppressing postoperative relapse.Encouraged by excellent efficacy,we further exploited this signal-amplifying system to improve the efficiency of vaccine lysate in the treatment of refractory multiple GBM,a disease with limited clinical treatment options.In general,this biomaterial-based immune signal amplification system represents a unique approach to restore GBM-specific immunity and may provide a beneficial preliminary treatment for other clinically refractorymalignancies.Qiujun Qiu Sunhui Chen Huining He Jixiang Chen Xinyi Ding Dongdong Wang Jiangang Yang Pengcheng Guo Yang Li Jisu Kim Jianyong Sheng Chao Gao Bo Yin Shihao Zheng Jianxin Wang 2023Acta Pharmaceutica Sinica B2023,13,12:0
15Synergistically enabling the interface stability of lithium metal batteries with soft ionic gel and garnet-type Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12)ceramic filler显示文摘Lithium metal batteries based on solid electrolytes are considered as promising candidates with high energy density and safety.However,the weak solid-solid contact between electrolyte and electrode can easily lead to interface instability and lithium ions discontinuous migration,which seriously reduces the electrochemical performance of the battery.Herein,we construct a soft gel interfacial layer to improve the stability of the solid-solid interface between electrolyte and electrode by means of polyester-based monomers and imidazole-based ionic liquids.Based on this,garnet-type Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12)(LLZTO)particles as inorganic ceramic filler were introduced in the layer to obtain composite electrolytes with high ionic conductivity(up to 1.1×10^(-3)S/cm at 25℃).As a result,the assembled lithium symmetric battery of Li|THCE-15%LLZTO|Li suggests excellent cycling stability with 700 h at 0.1 mA/cm^(2)at 50℃,and the lithium metal batteries of LFP|THCE-15%LLZTO|Li delivers high initial discharge capacity of 128.2 mA·h/g with capacity retain of 75.48%after 150 cycles at 2 C.This work paves a new route to build safe and stable lithium metal batteries with synergistic introduction of composite electrolytes between electrolyte and electrode using soft gel interfacial layer and inorganic filler.Qiujun Wang Weiqi Zhu Ya Su Di Zhang Zhaojin Li Huan Wang Huilan Sun Bo Wang Dan Zhou Li-Zhen Fan 2023Journal of Materiomics2023,9,3:0
16Survey of changes in dietary preferences in cancer patients in China显示文摘Objective The aim of this study was to investigate the changes in dietary preferences in cancer patients in China and to determine the need for encouraging the adherence to a sensible diet among such patients.Methods A total of 468 cancer patients were interviewed using a self-designed questionnaire focusing on changes in the intake of specific foods. Data were analyzed using SPSS 16.0. Results Most patients completely avoided roosters and carp(73.1%), condiments(51.9%), and meat of aquatic species(40.4%). All other types of the specific foods were completely avoided by different subpopulations of the patients.Conclusion In addition to focusing on disease treatment, medical professionals need to help cancer patients overcome barriers associated with the customs of avoiding specific foods encompassed by the term 'fawu' and provide them with dietary guidance in order to prevent negative nutritional effects.Jing Li Liqiong Zhang Qiujun Tang Xianglin Yuan 2015Oncology and Translational Medicine2015,1,3:0
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