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Racemic Bisindole Alkaloids: Structure, Bioactivity, and Computational Study

Chinese Journal of Chemistry 2021年第9期39卷 2588-2598页

作者： Tian-Yun Jin Ping-Lin Li Ci-Li Wang Xu-Li Tang mei-mei cheng Yuan Zong Lian-Zhong Luo Hui-Long Ou Ke-Chun Liu Guo-Qiang Li Key Laboratory of Marine Drugs Chinese Ministry of EducationSchool of Medicine and Pharmacy DepartmentOcean University of ChinaQingdaoShandong 266003China Laboratory of Marine Drugs and Biological Products National Laboratory for Marine Science and TechnologyQingdaoShandong 266235China College of Chemistry and Chemical Engineering State-Province Joint Engineering Laboratory of Marine Bioproducts and TechnologyOcean University of ChinaQingdaoShandong 266003China Engineering Research Center of Marine Biopharmaceutical Resource Xiamen Medical CollegeXiamenFujian 361023China College of Ocean and Earth Sciences Xiamen UniversityXiamenFujian 361006China Biology Institute Qilu University of Technology(Shandong Academy of Sciences)JinanShandong 250099China

The new racemic and dimeric in dole alkaloids with the characteristic cyclope nta[b]indole backb one,(+)-and(-)-sp on domi ne(la/lb),were isolated from a cultured sponge Tedania anhelans.A semi-synthesis was employed to obtain la/lb and the other four stereoisomers *** structures were determined by spectroscopic analysis,single-crystal X-ray,and quantum chemical *** stereoisomers differ in bioactivity according to their absolute con ***,(+)-sp on domi ne(la)displayed cytotoxicity against the K562 cell line and exhibited stronger Wnt and HIF1 dual signaling inhibitory activity at 5 pmol/L than the positive control,which offers an exciting starting point for further *** stereoisomers significantly promoted angiogenesis and showed moderate anti-inflammation in zebrafish.A quantum chemical calculation and deuteration experiment were applied to unveil the reacti on mechanism which guides the synthesis of the target compounds.

关键词： Tedania anhelans Alkaloids Cyclopenta[b]indole Biological activity Reaction mechanisms

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Residual Closeness of Graphs with Given Parameters

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Journal of the Operations Research Society of China 2023年第4期11卷 839-856页

作者： mei-Qun cheng Bo Zhou School of Mathematical Sciences South China Normal UniversityGuangzhou510631GuangdongChina

Robustness of the network topology is a key aspect in the design of computer networks. Residual closeness is a new graph-theoretic concept defined as a measure of network robustness due to the failure of individual vertices. We identify those graphs with maximum residual closeness among connected graphs with fixed connectivity, edge connectivity and bipartiteness, respectively.

关键词： Residual closeness Connectivity Edge connectivity Bipartiteness

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Buerger运动用于下肢创伤患者康复训练的研究

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中国实用护理杂志 2006年第11期22卷 6-8页

作者：朱丽萍关小玲肖秀娟黄迎春练美容广东省韶关市第一人民医院护理部

目的观察Buerger运动用于下肢创伤患者康复训练的效果。方法将96例下肢创伤患者随机分为实验组和对照组,实验组48例采用Buerger运动进行康复训练,对照组48例采用传统功能锻炼法进行康复训练,观察两组患者下床活动后患肢肿胀、疼痛和紫... 详细信息

目的观察Buerger运动用于下肢创伤患者康复训练的效果。方法将96例下肢创伤患者随机分为实验组和对照组,实验组48例采用Buerger运动进行康复训练,对照组48例采用传统功能锻炼法进行康复训练,观察两组患者下床活动后患肢肿胀、疼痛和紫绀情况,比较两种方法的康复效果。结果两组患者下床活动第一天患肢的肿胀、疼痛和紫绀程度采用秩和检验(P<0.01);第7天患肢的肿胀、疼痛和紫绀消退情况采用卡方检验(P<0.01)。结论Buerger运动康复训练能有效预防或减轻下肢创伤患者下床活动后患肢出现的肿胀、疼痛和紫绀症状,缩短康复时间,该方法值得临床推广应用。

关键词：下肢创伤 Buerger运动康复训练

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Electrohydrodynamic behaviors of droplet under a uniform direct current electric field

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Chinese Physics B 2020年第3期29卷 312-317页

作者： Zi-Long Deng mei-mei Sun cheng Yu Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China Department of Mechanical Engineering University of Hawaii at ManoaHonolulu 96822USA

The electrohydrodynamic behaviors and evolution processes of silicone oil droplet in castor oil under uniform direct current(DC)electric field are visually observed based on a high-speed microscopic ***,the effects of different working conditions,such as electric field strength,droplet size,etc.,on droplet behaviors are roundly *** can be found that there are four droplet behavior modes,including Taylor deformation,typical oblique rotation,periodic oscillation,and fracture,which change with the increase of electric field *** is also demonstrated that the degree of flat ellipse deformation gets larger under a stronger electric ***,both of the stronger electric field and smaller droplet size lead to an increase in the rotation angle of the droplet.

关键词： DC electric field droplet deformation rotation

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THEORIES AND METHODS OF STRATEGIC ENVIRONMENTAL ASSESSMENT OF MODERN LOGISTICS DEVELOPMENT——A Case Study of Dalian City, China

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Chinese Geographical Science 2005年第2期15卷 145-150页

作者： XULing SHANGJin-cheng WANGYu-mei Northeast Institute of Geography and Agricultural Ecology Chinese Academy of ScieneesChangchun 130012P.R.China Graduate School of Chinese Academy of Sciences Beijing 100039P.R.China Department of Environmental Sciences and Engineering Northeast Normal UniversityChangchun 130024P.R.China

Modern logistics is a new industry during the construction of national economy. Based on analyzing the environmental problem that was led by the limitation of the strategy during enacting the program of the modern logistics, SEA for modern logistics was implemented. In this paper, procedure and indicator system in the SEA are constructed, and Environmental Check List to identify environmental impact factors of SEA for modern logistics is established. And a conception that indicates friendly degree of logistics system with resources and environment, degree of green, is introduced. With the example of modern logistics program of Dalian in China, two methods are applied, AHP and Fuzzy Comprehensive Evaluation Method, in the implement of SEA for modern logistics development. It is concluded that degree of green of modern logistics in Dalian is high. However, several important factors should be paid much attention to in the SEA for modern logistics as well as in the formulation and implement of modern logistics in Dalian.

关键词： modern logistics strategic environmental assessment (SEA) degree of green Dalian

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D2ANet:Difference-aware attention network for multi-level change detection from satellite imagery

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Computational Visual Media 2023年第3期9卷 563-579页

作者： Jie mei Yi-Bo Zheng Ming-Ming cheng TMCC CSNankai UniversityTianjin 300350China State Key Laboratory of Earth Surface Processes and Resource Ecology Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China

Recognizing dynamic variations on the ground,especially changes caused by various natural disasters,is critical for assessing the severity of the damage and directing the disaster ***,current workflows for disaster assessment usually require human analysts to observe and identify damaged buildings,which is labor-intensive and unsuitable for large-scale disaster *** this paper,we propose a difference-aware attention network(D2ANet)for simultaneous building localization and multi-level change detection from the dual-temporal satellite *** the differences in different channels in the features of pre-and post-disaster images,we develop a dual-temporal aggregation module using paired features to excite change-sensitive channels of the features and learn the global change *** the nature of building damage caused by disasters is diverse in complex environments,we design a difference-attention module to exploit local correlations among the multi-level changes,which improves the ability to identify damage on different *** experiments on the large-scale building damage assessment dataset xBD demonstrate that our approach provides new state-of-the-art *** code is publicly available at https://***/mj129/D2ANet.

关键词： change detection building localization sate-llite imagery dual-temporal aggregation difference attention

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Non-linear Radical Additions-Coupling Polymerization of Monovinyl Monomers towards Polymer Networks: Theory, Tunability and Heritable Architecture

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Chinese Journal of Polymer Science 2022年第12期40卷 1623-1630,I0008页

作者： Li-mei Ren cheng-Lin Li Qi Wang MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science&Engineering Zhejiang UniversityHangzhou 310027China Current address:Zhejiang University-University of Edinburgh Institute Zhejiang University School of Medicineand Key Laboratory of Tissue Engineering and Regenerative Medicine of Zhejiang ProvinceZhejiang University School of MedicineHangzhou 310027China

Exploring new polymerization strategy for current available monomers is a big challenge in polymer science. Here we re-investigate radical polymerization of monovinyl monomer(MVM) initiated by uniform branched polyfunctional initiator(PFI), which is termed non-linear radical additions-coupling polymerization(NLRAs CP). In NLRAs CP, both addition and coupling reactions of radical contribute to the construction of the polymer chains, which leads to continuous growth of branch topology. Theoretical analysis of NLRAs CP predicts that the gelation is determined by the functionality of PFI(a), the extent of initiation of the PFI(q) and the termination factor of radical(φ). NLRAs CPs of styrene and methyl methacrylate promoted by Cu(0)/MeTREN or Mn_(2)(CO)_(10)/visible light were conducted. After the cleavage of incorporated PFI fragment or junctions in the network, the network was transformed to linear chains having almost the same structure as segmental chains in the precursor network. This allows the reverse deducing the network structure from its cleaved products. It has been proven that NLRAs CP includes stepwise initiation of PFI, chain-growth of segmental chains and successive endlinking of macroradicals derived from PFI. The three parameters related to the gelation process, a, q and φ, were adjusted via binary PFI, the feed ratio of [Mn_(2)(CO)_(10)]/[PFI] and addition of non-homopolymerizable comonomer respectively. The minimum values of a and q, and the minimum amount of comonomer required for gelation were determined,which can be applied to estimate φ of various macroradicals. NLRAs CP opens a general and facile strategy for synthesis of a variety of polymer networks with heritable architecture by one-pot polymerization of various MVMs.

关键词： Non-linear radical additions-coupling polymerization Monovinyl monomer Polyfunctional initiator Polymer network Theory

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Microstructure and mechanical properties of Ti-Cu amorphous coating synthesized on pure Cu substrate by mechanical alloying method

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Rare Metals 2020年第10期39卷 1222-1228页

作者： cheng Chen Xiao-mei Feng Yi-fu Shen School of Mechanical and Power Engineering Nanjing Tech UniversityNanjing 211800China College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Mechanical alloying method was applied to fabricate coating with amorphous structure on pure Cu *** microstructure,the phase composition and the mechanical properties including microhardness and wear resistance of the coating were,respectively,characterized and *** results show that the coating is rough but *** has favorable adhesion to the *** coating is made up of an inner composite layer and an outer amorphous *** microhardness and the wear resistance of the pure Cu substrate are improved because of the bilayer *** formation mechanism of the coating was *** as-synthesized coating is considered to be effective to strengthen the surface of pure Cu substrate.

关键词： Coating Amorphous Mechanical alloying Surface reinforcement

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Impact of ethanol on the flotation efficiency of imidazolium ionic liquids as collectors:Insights from dynamic surface tension and solvation analysis

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International Journal of Minerals,Metallurgy and Materials 2024年第12期31卷 2645-2656页

作者： Qian cheng Zerui Lei Guangjun mei Jianhua Chen Key Laboratory of Green Utilization of Critical Non-metallic Mineral Resources Ministry of EducationWuhan University of TechnologyWuhan 430070China MOE Key Laboratory of New Processing Technology for Non-ferrous Meta1s and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004China

To conduct extensive research on the application of ionic liquids as collectors in mineral flotation,ethanol(EtOH)was used as a solvent to dissolve hydrophobic ionic liquids(ILs)to simplify the reagent *** phenomena were observed in which EtOH exerted different effects on the flotation efficiency of two ILs with similar *** EtOH was used to dissolve 1-dodecyl-3-methylimidazolium chloride(C12[mim]Cl)and as a collector for pure quartz flotation tests at a concentration of 1×10^(−5)mol·L^(−1),quartz recovery increased from 23.77%to 77.91%compared with ILs dissolved in ***,quartz recovery of 1-dodecyl-3-methylim-idazolium hexafluorophosphate(C12[mim]PF6)decreased from 60.45%to 24.52%under the same *** conditional experi-ments under 1×10^(−5)mol·L^(−1)ILs for EtOH concentration and under 2vol%EtOH for ILs concentration confirmed this *** being affected by EtOH,the mixed ore flotation tests of quartz and hematite showed a decrease in the hematite concentrate grade and re-covery for the C12[mim]Cl collector,whereas the hematite concentrate grade and recovery for the C12[mim]PF6 collector *** the basis of these differences and observations of flotation foam,two-phase bubble observation tests were carried *** EtOH promoted the foam height of two ILs during *** accelerated static froth defoaming after aeration stopped,and the foam of C12[mim]PF6 de-foaming especially *** the discussion of flotation tests and foam observation,an attempt was made to explain the reasons and mechanisms behind the diverse phenomena using the dynamic surface tension effect and solvation effect results from *** solva-tion effect was verified through Fourier transform infrared(FT-IR),X-ray photoelectron spectroscopy(XPS),and Zeta potential ***-though EtOH affects the adsorption of ILs on the ore surface during flotation negatively,it holds an positive value of inhibiting foam mer-ging during flotation a

关键词： ionic liquid ethanol flotation foam solvation dynamic surface tension

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The Spectrum for Overlarge Sets of Hybrid Triple Systems

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Acta Mathematicae Applicatae Sinica 2014年第3期30卷 635-646页

作者： mei-hui cheng Zi-hong TIAN Huihua College of Hebei Normal University College of Mathematics and Information Science Hebei Normal University

A hybrid triple system of order v and index A, denoted by HTS（v, λ）, is a pair （X,B） where X is a v-set and B is a collection of cyclic triples and transitive triples on X, such that every ordered pair of X belongs to A triples of B. An overlarge set of disjoint HTS（v, λ）, denoted by OLHTS（v, λ）, is a collection {（Y／{y}, .Ai）}i, such that Y is a （v ＋ 1）-set, each （Y／{y}, Ai） is an HTS（v, λ,） and all Ais form a partition of all cyclic triples and transitive triples on Y. In this paper, we shall discuss the existence problem of OLHTS（v, A） and give the following conclusion： there exists an OLHTS（v, λ） if and only if λ= 1, 2, 4, v = 0, 1 （rood 3） and v ≥ 4.

关键词： overlarge set hybrid triple system hybrid candelabra system

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