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Quantum chemical studies on antimalarial of artemisinin (qinghaosu) derivatives

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Chinese Journal of Chemistry 1995年第2期13卷 131-140页

作者： JIANG, HL CHEN, KX TANG, Y CHEN, jz JI, RY CHINESE ACAD SCI SHANGHAI INST MAT MEDSHANGHAI 200031PEOPLES R CHINA

In this paper theoretical studies were performed on artemisinin (qinghaosu) derivatives with semiempirical quantum chemical methods AM1 and PM3. The antimalarial activity -logC has an obvious correlation with the net charge of C(16) and bond orders of bonds O(1)-C(10), O(2)-C(6), O(1)-O(2) and O(5)-C(16). According to the calculation results, we derived structure-activity relationship, presented the probable pharmacophore of qinghaosu derivatives and the interaction fashion between the drugs and the plasmodium receptor.

关键词： ARTEMISIniN (QINGHAOSU) ANTIMALARIAL QUANTUM CHEMISTRY PHARMACOPHORE

Climatic instability record during the Penultimate Glaciation: Evidence from Huining loess

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Chinese Science Bulletin 1997年第20期42卷 1720-1723页

作者： Ren, jz Ding, ZL Liu, DS Quan, H China Japan Friendship Ctr Environm Protect Open Lab Beijing 100029 Peoples R China

THE investigations of past global changes reveal strong climatic instability during the lastglaciation. Most terrestrial palaeoclimate records have not given climatic conditionclues in the Penultimate Glaciation. It is very necessary for us to know whether the climaticinstability picture is a particular phenomenon occurring only in the last glacial period. In

关键词： China Loess Penultimate Glaciation climatic instability.

STRUCTURE OF 1-EPICRASSICAUDINE

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Chinese Chemical Letters 1995年第2期6卷 109-110页

作者： Wang, FP Dai, XP Wang, jz Zhang, R W China Univ Med Sci Sch Pharm Dept Chem Med Nat Prod Chengdu 610044 Peoples R China

A new C-19-diterpenoid alkaloid. 1-epicrassicaudine, was isolated from the roots of Aconitum hemslevanum Pritz var. pengshinese. Spectral methods demonstrated that it has the structure represented by (1) an 1-epimer o...

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Talaromyces peaticola(Aspergillaceae,Eurotiales),a new species from the Zoige wetlands,China

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Studies in Fungi 2021年第1期6卷 391-399页

作者： Tian JQ Wang YF Sun jz State Key Laboratory of Mycology Institute of MicrobiologyChinese Academy of SciencesNo.3 Park 1Beichen West RoadChaoyang DistrictBeijing 100101P.R.China State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China University of Chinese Academy of Sciences 100049 BeijingChina

Species in Talaromyces section Trachyspermi are isolated from a wide range of substrates,including soil,house dust,leaf,wood and fruit from temperate region to tropical *** a survey of fungal diversity in Zoige wetlands,three isolates with biverticillate adpressed penicilli and spheroidal conidia belonging to Talaromyces are isolated from peat *** analyses based on a combined ITS,BenA,CaM and RPB2 sequence data suggests they represent a novel taxon in Talaromyces section Trachyspermi,namely Talaromyces *** spite of *** has a close affinity to *** in phylogeny,it is readily distinguished from the later,resulted from growing slowly on CREA at 25℃,exudating small clear droplets on MEA,and producing smaller conidia than that of ***.

关键词： 1 new taxon peatland Qinghai-Tibetan Plateau taxonomy

Diversity of wood-decaying fungi in Haikou Forestry Farm,Yunnan Province,***

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Studies in Fungi 2021年第1期6卷 365-377页

作者： He X Chen jz Zhao CL College of Biodiversity Conservation Southwest Forestry UniversityKunming 650224P.R.China

nine field trips carried out in Haikou Forestry Farm,Yunnan Province,*** resulted in 681 specimens of wood-decaying *** present paper summarizes 52 species collected that are distributed in 37 genera,16 families,6 orders including their hosts and substrates.A checklist of wood-decaying fungi in Haikou Forestry Farm is also *** analysis of ITS nrRNA gene region was performed for all the collected samples with maximum likelihood,maximum parsimony and Bayesian inference *** phylogenetic tree showed that fifty-two species nested in sixteen families belonging to six orders in Agaricomycetes.

关键词： Basidiomycota biological resources diversity Haikou Forestry Farm mycota

Ensemble Classifier Design Based on Perturbation Binary Salp Swarm Algorithm for Classification

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Computer Modeling in Engineering & Sciences 2023年第4期135卷 653-671页

作者： Xuhui Zhu Pingfan Xia Qizhi He Zhiwei ni Liping ni School of Management Hefei University of TechnologyHefei230009China School of Statistics Zhejiang Gongshang UniversityHangzhou310018China Key Laboratory of Process Optimization and Intelligent Decision-Making Ministry of EducationHefei230009China Collaborative Innovation Center for Statistical Data Engineering Technology and Application ZhejiangGongshang UniversityHangzhou310018China

Multiple classifier system exhibits strong classification capacity compared with single classifiers,but they require significant computational *** ensemble system aims to attain equivalent or better classification accuracy with fewer ***,current methods fail to identify precise solutions for constructing an ensemble *** this study,we propose an ensemble classifier design technique based on the perturbation binary salp swarm algorithm(ECDPB).Considering that extreme learning machines(ELMs)have rapid learning rates and good generalization ability,they can serve as the basic classifier for creating multiple candidates while using fewer computational ***,we introduce a combined diversity measure by taking the complementarity and accuracy of ELMs into account;it is used to identify the ELMs that have good diversity and low *** addition,we propose an ECDPB with powerful optimizing ability;it is employed to find the optimal subset of *** selected ELMs can then be used to forman ensemble *** on 10 benchmark datasets have been conducted,and the results demonstrate that the proposed ECDPB delivers superior classification capacity when compared with alternative methods.

关键词： Ensemble classifier salp swarmalgorithm diversity measure multiple classifiers system extreme learning machine

Fractals in Steel-Aluminum Solid to Liquid Bonding

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Journal of Materials Science & Technology 1999年第5期15卷 486-488页

作者： Zhang, P Du, YH Ren, XP Ba, LM Liu, HW Cui, jz Univ Sci & Technol Beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China Anshan Automobile Fittings Factory Anshan 114014 Peoples R China Northeastern Univ Met Forming Dept Shenyang 110006 Peoples R China

This paper studied the fractal characteristic of the interfacial shear surface of steel-Al solid to liquid bonding plate, and determined the relationship between fractal dimension and interfacial shear strength. The research results showed that the relationship between fractal dimension and interfacial shear strength could be described as y=26.2x+4.2 (where y was interfacial shear strength, x was fractal dimension) and when 08Al steel plate was coarsened by steel wire wheel which was made up with steel wires whose diameter were 1.4 similar to 1.6 mm, the optimum coarsening pattern of the steel plate surface could be got, the corresponding maximum interfacial shear surface fractal dimension of the bonding plate was 2.33, and the maximum interfacial shear strength of the bonding plate was 65.3 MPa.

关键词： Nature MPa

Hypersensitivity and its application to structural analysis of lanthanide complexes

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Chinese Journal of Chemistry 1997年第1期15卷 49-53页

作者： Yang, W Chen, M Gao, jz Yang, WD Kang, JW Yang, HW NW NORMAL UniV DEPT PHYSLANZHOU 730070GANSUPEOPLES R CHINA

Hypersensitivity of the ternary complexes Ln(beta-dik)(4)HMQ(where Ln=Nd, Ho, Er, beta-dik=acetylacetonate(AA), dibenzoylmethanate(DBM) and MQ=4-methylquinoline) in acetone solution is studied based on the dynamic coupling model. The structures of these complexes in solution are deduced. Their coordination polyhedrons are all distorted square antiprism. Neodymium complexes have D-2 symmetry, while holmium and erbium complexes have exact D-2d symmetry.

关键词： hypersensitivity structural analysis lanthanide ternary complexes

Measurement and Calculation of Quenching Rate Constants for PCl(b)

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Chinese Chemical Letters 1996年第12期7卷 1125-1126页

作者： Zou, SL Liu, CP Guo, jz Gu, YS Chu, YN Cao, DZ SHANDONG UniV DEPT CHEMJINAN 250100PEOPLES R CHINA ACAD SIniCA ANHUI INST OPT & FINE MECHLASER SPECT LABHEFEI 230031PEOPLES R CHINA

Using the Ar(P-3(0.2)) +PCl3 reaction as a source of PCl(b(1) Sigma(+)). We have measured the quenching rate constants of PCl(b) for 23 reagents. The E -V model is used to calculate the rate constants. The comparison ... 详细信息

关键词： Measurement and Calculation of Quenching Rate Constants for PCl