维普中文期刊产品整合服务
96篇 您的检索式:作者名="Qingfeng Chen"
    题名 作者 年代 出处 被引量
1Improving Yield and Nitrogen Use Efficiency Simultaneously for Maize and Wheat in China: A Review显示文摘同时完成两高收益和高氮使用效率(NUE ) 与对食物,自然资源的弄空,和环境的恶化的增加的全球需求成为了主要挑战。作为在世界上的 N 化肥的最伟大的消费者,中国农民滥用了 N,并且因为 N 举起收益关系的有限理解,在庄稼 N 需求和 N 供应之间有差的 synchrony。处理这个问题,这研究为二个学生的不同收益范围评估了全部、动态的 N 要求庄稼(玉米和小麦) ,和到 N 管理策略的建议改进。整个植物的 N 未葬举起要求每谷物产量(N req ) 开始与谷物收益改进死亡了然后停滞,并且然而,大多数农民仍然相信更多的化肥和更高的谷物产量是同义的。当玉米产量增加了从时 < 7.5 到 > 12.0 Mg 哈 −1, N req 从 19.8 ~ 17.0 kg Mg −1 谷物减少了。为小麦,它为谷物产量从 27.1 kg Mg −1 谷物减少了 < 4.5 Mg 哈 −1 到为产量的 22.7 kg Mg −1 谷物 > 9.0 Mg 哈 −1 。同时,干燥物质的百分比和在中间迟了的成长季节的 N 累积与谷物产量显著地增加了,它显示 N 授精应该在中间迟了的阶段被集中当农民们经常在播种前或在早生长阶段期间使用了 N 化肥的多数时,匹配庄稼需求。我们因此开发了同时增加谷物产量和 NUE 的综合土壤庄稼系统管理策略。MENG Qingfeng YUE Shanchao HOU Peng CUI Zhenling CHEN Xinping 2016Pedosphere2016,26,2:51
2The Inhibitory Effect of Oridonin on the Growth of Fifteen Human Cancer Cell Lines显示文摘OBJECTIVE To study the inhibitory effect of oridonin on the growth of cancer cells. METHODS Fifteen human cancer cell lines were subjected to various concentrations of oridonin in culture medium. The inhibitory rate of cell growth was measured by the MTT assay, and compared with a negative con- trol and 5-Fu-positive control. RESULTS The 50% inhibiting concentration (IC50) and maximal inhibition (Imax) of oridonin shown by studying the growth of the cancer cell lines were as follows: leukemias (HL60 cells: 3.9 μg/ml and 73.8%, K562 cells: 4.3 μg/ml and 76.2%); esophageal cancers(SHEEC cells: 15.4 μg/ml and 99.2%, Eca109 cells: 15.1 μg/ml and 84.6%, TE1 cells: 4.0 μg/ml and 70.2%); gastric cancers (BGC823 cells: 7.6 μg/ml and 98.7%, SGC7901 cells: 12.3 μg/ml and 85.7%); colon cancers (HT29 cells: 13.6 μg/ml and 97.2%, HCT cells: 14.5 μg/ml and 96.5%); liver cancers (Bel7402 cells: 15.2 μg/ml and 89.2%, HepG2 cells: 7.1 μg/ml and 88.3%); pancreatic cancer (PC3 cells: 11.3 μg/ml and 68.4%); lung cancer (A549 cells: 18.6 μg/ml and 98.0% ); breast cancer (MCF7 cells: 18.4 μg/ml and 84.7%); uterine cervix cancer (Hela cells: 13.7 μg/ml and 98.5%). CONCLUSION Oridonin had a relatively wide anti-tumor spectrum, and a relatively strong inhibitory effect on the growth of the 15 human cancer cells. Inhibitory effects were concentration dependent.Junhui Chen Shaobin Wang Dongyang Chen Guisheng Chang Qingfeng Xin Shoujun Yuan Zhongying Shen 2007Chinese Journal of Clinical Oncology2007,4,1:32
3A structural view of the conserved domain of rice stress-responsive NAC1显示文摘The importance of NAC(named as NAM,ATAF1,2,and CUC2)proteins in plant development,transcription regulation and regulatory pathways involving proteinprotein interactions has been increasingly recognized.We report here the high resolution crystal structure of SNAC1(stress-responsive NAC)NAC domain at 2.5Å.Although the structure of the SNAC1 NAC domain shares a structural similarity with the reported structure of the ANAC NAC1 domain,some key features,especially relating to two loop regions which potentially take the responsibility for DNA-binding,distinguish the SNAC1 NAC domain from other reported NAC structures.Moreover,the dimerization of the SNAC1 NAC domain is demonstrated by both soluble and crystalline conditions,suggesting this dimeric state should be conserved in this type of NAC family.Additionally,we discuss the possible NAC-DNA binding model according to the structure and reported biological evidences.Qingfeng Chen Quan Wang Lizhong Xiong Zhiyong Lou 2011Protein & Cell2011,2,1:18
4A Highly Pathogenic Strain of Porcine Deltacoronavirus Caused Watery Diarrhea in Newborn Piglets显示文摘Porcine deltacoronavirus(PDCoV) is a newly identified virus that causes watery diarrhea in newborn piglets and results in significant economic losses to the pig industry. Since first reported in Hong Kong in 2012, PDCoV has been subsequently detected in USA, South Korea, Thailand, and China's Mainland. Here we isolated a strain of PDCoV, named CHN-GD-2016,from the intestinal content of a diseased newborn piglet with severe diarrhea in a pig farm in Guangdong, China. PDCoV CHN-GD-2016 could be identified by immunofluorescence with PDCoV specific rabbit antisera, and typical crown-shaped particles with spiky surface projections of this PDCoV were observed with electron microscopy. Genomic analysis showed that the PDCoV CHN-GD-2016 was closely related to other Chinese PDCoV strains, with the highest sequence similarity with the strain CHN/Tianjin/2016. Importantly, inoculation of newborn piglets with 1×10~5 TCID_(50) of CHN-GD-2016 by oral feeding successfully reproduced clear clinical symptoms, including vomiting, dehydration, and severe diarrhea in piglets. In addition, the virus RNA in rectal swabs from 1 to 7 days post inoculation was detected, macroscopic and microscopic lesions in small intestine were observed, and viral antigen was also detected in the small intestines with immunohistochemical staining. Collectively, the data show in this study confirms that PDCoV is present in Guangdong,China and is highly pathogenic in newborn piglets.Zhichao Xu Huiling Zhong Qingfeng Zhou Yunping Du Li Chen Yun Zhang Chunyi Xue Yongchang Cao 2018Virologica Sinica2018,33,2:16
5Zeolitic Imidazolate Framework 8-Derived Au@ZnO for Efficient and Robust Photocatalytic Degradation of Tetracycline显示文摘Summary of main observation and conclusion Tetracycline (TC) and other antibiotics accumulated in groundwater and soil pollute ecological environment and threaten human health. Gold nan oparticles doped on photocatalysts are able to enhance the photodegradation efficiency during removing these antibiotics, but preparation of Au nanoparticles of well-dispersion on photocatalysts remains challenging. In this work, zeolite imidazolate (ZIF-8) was employed as the precursor to prepare Au@ZnO photocatalyst via impregnation and in-situ reduction method to efficiently degrade the tetracycline in the aqueous solution. Au nanoparticles are of 10 nm in size and uniformly dispersed on the surfaces of ZnO microstructures. The as-prepared Au@ZnO is able to remove 85.5% of TC of 0.010 mg/mL within 2h, presenting higher photocatalytic activity than pure ZnO catalyst. Most importantly, the catalyst shows its superior stability after five cycles without structure and activity changing. The mechanism of the photocatalytic degradation was discussed in detail.Bijun Gao Jin Zhou Hongliang Wang Guping Zhang Jinghui He Qingfeng Xu Najun Li Dongyun Chen Hua Li Jianmei Lu 2019Chinese Journal of Chemistry2019,37,2:6
6Human CD34loCD133lo fetal liver cells support the expansion of human CD34hiCD133hi hematopoietic stem cells显示文摘Kylie Su Mei Yong Choong Tat Keng Shu Qi Tan Eva Loh Kenneth TE Chang Thiam Chye Tan Wanjin Hong Qingfeng Chen 2016Cellular & Molecular Immunology2016,13,5:5
7Multimetallic AuPd@Pd@Pt core-interlayer-shell icosahedral electrocatalysts for highly efficient oxygen reduction reaction显示文摘Incorporating Pt with core metals into Pt-based core-shell catalysts is regarded as a promising strategy to substantially enhance the catalytic properties towards oxygen reduction reaction(ORR) in fuel cells due to the synergetic effect between distinct metals. In this wok, ultrathin Pt skins with two atomic layers were epitaxially coated on as-prepared icosahedral Au_50Pd_50, Au_60Pd_40 and Au_66Pd_34 nanocrystal seeds,which are constructed with alloyed cores and Pd shells with different thickness. Through electron microscopic characterizations, Pd interlayers with tunable thickness of 3, 6, and 12 atomic layers can be found in the Au_66Pd_34@Pt, Au_60 Pd_40@Pt and Au_50Pd_50@Pt icosahedra, respectively. These icosahedral Au Pd@Pd@Pt nanocrystals show substantially enhanced activities and durabilities in electrocatalytic measurements towards ORR compared to Au_75Pd_25@Pt icosahedra without Pd interlayer and commercial Pt/C catalysts. Specifically, Au_60Pd_40@Pt icosahedra with 6 atomically thick Pd interlayer display the best electrocatalytic performances, whose mass activities before and after durability tests of 50,000 cycles are11.6 and 30.2 times, respectively, as high as that of the commercial Pt/C.Qingfeng Xu Wenlong Chen Yucong Yan Zhemin Wu Yi Jiang Junjie Li Ting Bian Hui Zhang Jianbo Wu Deren Yang 2018Science Bulletin2018,63,8:5
8Fargeted elimination of mutant mitochondria DNA in MELAS-iPSCs by mitoTALENs显示文摘Yi Yang Han Wu Xiangjin Kang Yanhui Liang Ting Lan Tianjie Li Tao Tan Jiangyun Peng Quanjun Zhang Geng An Yali Liu Qian Yu Zhenglai Ma Ying Lian Boon Seng Soh Qingfeng Chen Ping Liu Yaoyong Chen Xiaofang Sun Rong Li Xiumei Zhen Yang Yu Xiaoping Li Yong Fan 2018Protein & Cell2018,9,3:4
9Obacunone activates the Nrf2-dependent antioxidant responses显示文摘Xu, Shengmei Chen, Weimin Xie, Qingfeng Xu, Yang 2016Protein & Cell2016,7,9:4
10Superior performance and high service stability for Ge Te-based thermoelectric compounds显示文摘GeTe-based compounds have been intensively studied recently due to their superior thermoelectric performance,but their real applications are still limited so far due to the drastic volume variation that occurs during the rhombohedral–cubic phase transition,which may break the material or the material/electrode interface during service.Here,superior performance and high service stability for GeTe-based thermoelectric compounds are achieved by co-doping Mg and Sb into GeTe.The linear coefficient of thermal expansion before phase transition is greatly improved to match that after phase transition,yielding smooth volume variation around the phase transition temperature.Likewise,co-doping(Mg,Sb)in GeTe successfully tunes the carrier concentration to the optimal range and effectively suppresses the lattice thermal conductivity.A peak z T of 1.84 at 800 K and an average z T of 1.2 in 300–800 K have been achieved in Ge0.85Mg0.05Sb0.1Te.Finally,a Ni/Ti/Ge0.85Mg0.05Sb0.1Te thermoelectric uni-leg is fabricated and tested,showing quite good service stability even after 450 thermal cycles between 473 K and 800 K.This study will accelerate the application of GeTe-based compounds for power generation in the mid-temperature range.Tong Xing Qingfeng Song Pengfei Qiu Qihao Zhang Xugui Xia Jincheng Liao Ruiheng Liu Hui Huang Jiong Yang Shengqiang Bai Dudi Ren Xun Shi Lidong Chen 2019National Science Review2019,6,5:4
11Nsp2 has the potential to be a drug target revealed by global identification of SARS-CoV-2 Nsp2-interacting proteins显示文摘Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)has become a global health threat since December 2019,and there is still no highly effective drug to control the pandemic.To facilitate drug target identification for drug development,studies on molecular mechanisms,such as SARS-CoV-2 protein interactions,are urgently needed.In this study,we focused on Nsp2,a non-structural protein with largely unknown function and mechanism.The interactome of Nsp2 was revealed through the combination of affinity purification mass spectrometry(AP-MS)and stable isotope labeling by amino acids in cell culture(SILAC),and 84 proteins of high-confidence were identified.Gene ontology analysis demonstrated that Nsp2-interacting proteins are involved in several biological processes such as endosome transport and translation.Network analysis generated two clusters,including ribosome assembly and vesicular transport.Bio-layer interferometry(BLI)assay confirmed the bindings between Nsp2-and 4-interacting proteins,i.e.STAU2(Staufen2),HNRNPLL,ATP6V1B2,and RAP1GDS1(SmgGDS),which were randomly selected from the list of 84 proteins.Our findings provide insights into the Nsp2–host interplay and indicate that Nsp2 may play important roles in SARS-CoV-2 infection and serve as a potential drug target for anti-SARS-CoV-2 drug development.Yun-Xiao Zheng Lei Wang Wei-Sha Kong Hong Chen Xue-Ning Wang Qingfeng Meng Hai-Nan Zhang Shu-Juan Guo He-Wei Jiang Sheng-Ce Tao 2021Acta Biochimica et Biophysica Sinica2021,53,9:3
12Modulating the optical and electrical properties of MAPbBr_(3) single crystals via voltage regulation engineering and application in memristors显示文摘Defect density is one of the most significant characteristics of perovskite single crystals(PSCs)that determines their optical and electrical properties,but few strategies are available to tune this property.Here,we demonstrate that voltage regulation is an efficient method to tune defect density,as well as the optical and electrical properties of PSCs.A three-step carrier transport model of MAPbBr_(3) PSCs is proposed to explore the defect regulation mechanism and carrier transport dynamics via an applied bias.Dynamic and steady-state photoluminescence measurements subsequently show that the surface defect density,average carrier lifetime,and photoluminescence intensity can be efficiently tuned by the applied bias.In particular,when the regulation voltage is 20 V(electrical poling intensity is 0.167 Vμm^(−1)),the surface defect density of MAPbBr_(3) PSCs is reduced by 24.27%,the carrier lifetime is prolonged by 32.04%,and the PL intensity is increased by 112.96%.Furthermore,a voltage-regulated MAPbBr_(3) PSC memristor device shows an adjustable multiresistance,weak ion migration effect and greatly enhanced device stability.Voltage regulation is a promising engineering technique for developing advanced perovskite optoelectronic devices.Jun Xing Chen Zhao Yuting Zou Wenchi Kong Zhi Yu Yuwei Shan Qingfeng Dong Ding Zhou Weili Yu Chunlei Guo 2020Light(Science & Applications)2020,9,1:3
13Contents Variation Analysis ofγ-Amino Butyric Acid in Semen sojae praeparatum Fermentation Using Online Pre-Column Derivatization-HPLC显示文摘This paper reported the contents variation analysis ofγ-amino butyric acid(GABA)in Semen sojae praeparatum(SSP)which is a famous traditional Chinese medicine.High performance liquid chromatography(HPLC)was used and GABA was derivatized by online pre-column derivatization with o-phthalaldehyde(OPA).To validate this method,the precision,stability,repeatability and recovery were discussed.In the concentration range from 0.0125 to 0.400 mg/m L,the calibration curve for GABA was linear and the regression equation was obtained with correlation coefficient(R2)of 0.9999.Relatively high levels of GABA exist in SSP and the content changes of GABA at different time points during the fermenting process were detected.At the'yellow cladding'stage,GABA level was very low or even undetectable;the'secondary fermentation'stage witnessed a rapid increase of GABA content to 1.39-5.52 mg/g,which remained stable after 18 days of'secondary fermentation'.This study demonstrated that GABA was generated at the'secondary fermentation'stage,revealing the significance and rationality of the'secondary fermentation'stage in the fermenting process of SSP.On the other hand,it suggested the downside of taking soy isoflavones as the only measurement in existing quality assessment and optimization approach for the fermenting process of SSP.WENG Meizhi HE Jing REN Jiaxiu LIANG Yonghong CHEN Qingfeng SU Mingsheng WANG Liyuan XIE Xiaomei 2021Wuhan University Journal of Natural Sciences2021,26,1:2
14A mini-review on ZnIn_(2)S_(4)-Based photocatalysts for energy and environmental application显示文摘As one of the most attractive and eco-friendly technologies,semiconductor photocatalysis is demonstrated as a potential strategy to solve global energy shortage environmental pollution problems.Regarding semiconductor-based photocatalysts,Zinc indium sulfide(ZnIn_(2)S_(4)) with various morphological structures has become research hotspots owing to its superior visible light absorption,high chemical durability and low cost.Nevertheless,the photocatalytic activity of pristine ZnIn_(2)S_(4) is unsatisfactory due to limited range of visible light absorption and fast recombination rate of light-induced electrons and holes.Different modification strategies,such as metal deposition,element doping,vacancy engineering and semiconductor combination,have been systematically developed for enhancing the photocatalytic performance of ZnIn_(2)S_(4) materials.In order to promote further developments of ZnIn_(2)S_(4) in photocatalytic applications,this mini-review summarizes the progress of recent research works for the construction of highly activity ZnIn_(2)S_(4)-based photocatalysts for the first time.In addition,the typical applications of ZnIn_(2)S_(4)-based photocatalytic materials have been critically reviewed and described such as in hydrogen evolution from photocatalytic water splitting,carbon dioxide photoreduction,and treatment of water pollution.The current challenges and further prospects for the development of ZnIn_(2)S_(4) semiconductor photocatalysts are finally pointed out.Guping Zhang Hao Wu Dongyun Chen Najun Li Qingfeng Xu Hua Li Jinghui He Jianmei Lu 2022Green Energy & Environment2022,7,2:2
15Engineering humanized mice for improved hematopoietic reconstitution显示文摘人性化的老鼠是与在整个老鼠的生活产生人的血房间的各种各样的系的人的造血的干细胞嫁接的 immunodeficient 动物。这篇文章在人性化的老鼠的产生考察最近的进展,集中于实际考虑。我们讨论不同 immunodeficient 接受者老鼠紧张,人的造血的干细胞的来源,在扩大的进展和调制接受者老鼠的 cytokine 环境的造血的干细胞,和技术的基因修正的特征,以便提高特定的人的血系房间的宪法。我们加亮新技术创造的机会并且讨论怎么为特定的研究应用程序做基本模型的拓宽的数组的最好的使用上的实际考虑。Adam C Drake Qingfeng Chen lianzhu Chen 2012Cellular & Molecular Immunology2012,9,3:2
16Origin of inhomogeneity in spark plasma sintered bismuth antimony telluride thermoelectric nanocomposites显示文摘Anisotropy and inhomogeneity are ubiquitous in spark plasma sintered thermoelectric devices.However,the origin of inhomogeneity in thermoelectric nanocomposites has rarely been investigated so far.Herein,we systematically study the impact of inhomogeneity in spark plasma sintered bismuth antimony telluride(BiSbTe)thermoelectric nanocomposites fabricated from solution-synthesized nanoplates.The figure of merit can reach 1.18,which,however,can be overestimated to 1.88 without considering the inhomogeneity.Our study reveals that the inhomogeneity in thermoelectric properties is attributed to the non-uniformity of porosity,textures and elemental distribution from electron backscatter diffraction and energy-dispersive spectroscopy characterizations.This finding suggests that the optimization of bulk material homogeneity should also be actively pursued in any future thermoelectric material research.Enzheng Shi Shuang Cui Nicholas Kempf Qingfeng Xing Thomas Chasapis Huazhang Zhu Zhe Li Je-Hyeong Bahk G.Jeffrey Snyder Yanliang Zhang Renkun Chen Yue Wu 2020Nano Research2020,13,5:2
17A quasi-3D Fano resonance cavity on optical fiber end-facet for high signal-to-noise ratio dip-and-read surface plasmon sensing显示文摘Surface plasmon devices mounted at the end-facets of optical fibers are appealing candidates for rapid and point-of-care sensing applications,by offering a special dip-and-read operation mode.At present,these devices’noise-equivalent limits-of-detection lag far behind the free-space counterparts,leaving them incapable of most biosensing applications.Here we report a quasi-3D Fano resonance cavity and its fabrication method to fundamentally improve the quality factor and coupling efficiency for fiber-coupled surface plasmon resonance.In this device,the Fano resonance combines the high coupling efficiency of a Fabry-Pérot etalon and the high quality factor resonance of a plasmonic crystal cavity.The quasi-3D device was fabricated on a planar substrate and transferred to a single-mode fiber end-facet,which requires a low-adhesion yet surface-plasmon-tunneling interface between the device and the planar substrate.Such an interface was realized with a nanocap-slit unit structure,of which the plasmonic crystal was consisted.A noise-equivalent limit of detection of~10-7 RIU was experimentally obtained,allowing bovine serum albumin physical adsorption to be distinguished at ng mL-1 level concentrations.Therefore,breaking through the long-standing signal-to-noise ratio bottleneck,this work makes fiber end-facet surface plasmon devices into one of high sensitivity label-free sensing technologies.At the same time,it provides an enabling top-down fabrication technology for making 3D plasmonic structures on fiber end-facets at the nanometer scale.Xiaqing Sun Zeyu Lei Hao Zhong Chenjia He Sihang Liu Qingfeng Meng Qingwei Liu Shengfu Chen Xiangyang Kong Tian Yang 2022Light(Advanced Manufacturing)2022,3,4:2
18The origins of the broadband photoluminescence from carbon nitrides and applications to white light emitting显示文摘碳氮化物在 700 点由三聚氰胺的热 polycondensationZhixing Gan Yun Shan Jiarui Chen Qingfeng Gui Qizhen Zhang Shouping Nie Xinglong Wu 2016Nano Research2016,9,6:2
19Influence of background pressure on the microstructure and optical properties of Mo/Si multilayers fabricated by magnetron sputtering显示文摘Mo/Si multilayers were fabricated by using magnetron sputtering method at different background pressures:6×10-5 Torr,3×10-5 Torr,and 3×10-6 Torr.The reflectivity of the Mo/Si multilayers increased from 1.93% to 16.63%,and the center wavelength revealed a blue shift to 0.12 nm with the decrease of background pressure.Grazing incident X-ray diffraction(GIXRD) indicated that multilayers fabricated at high background pressure possessed better periodic structure and thinner Mo-on-Si interlayers.Low crystallization degree in(110) preferred the orientation of Mo layers and serious interdiffusion in the Mo/Si multilayers fabricated at low background pressure were observed by transmission electron microscopy(TEM).According to quantitative analysis of microstructural parameters,the Mo layers thickness and thickness ratio of Mo/Si multilayers both decreased and approached the design value gradually by the decrease of background pressure.In addition,the thicknesses of Mo-on-Si and Si-on-Mo interlayers were 1.17 nm and 0.85 nm respectively.It is suggested that the influence of background pressures on the microstructure has a critical role in determining the optical properties of Mo/Si multilayers.LV Peng ZHANG ZaiQiang GUAN JinTong WANG XiaoDong HOU XiuLi ZHANG LingYan WANG JiJun CHEN Bo GUAN QingFeng 2013Science China(Physics,Mechanics & Astronomy)2013,56,9:2
20Stability of Nonlinear Networked Control System with?Uncertainties显示文摘Yingwei Zhang Xue Chen Qingfeng Meng 2010Circuits Systems and Signal Processing2010,,6:1
返回顶部 每页显示:
共5页 首页 上一页 第1页 下一页 末页 /5 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费