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Three minor new compounds from the aerial parts of leonurus japonicus

Chinese Chemical letters 2015年第8期26卷 1000-1003页

作者： wei-Mao Zhong Zhao-Meng Cui Zhi-Ke liu Yan Yang Da-Rong wu Shao-Hua liu Hui long Han-Dong Sun Yong-Jun Dang wei-lie xiao State Key laboratory of Phytochemistry and Plant Resources in west China Kunming Institute of Botany Chinese Academy of Sciences University of Chinese Academy of Sciences Key laboratory of Molecular Medicine Ministry of Education and Department of Biochemistry and Molecular Biology Fudan University Shanghai Medical College Chengdu No.1 Pharmaceutical Group Co. Ltd.

Phytochemical investigation of the aerial parts of leonurus japonicus led to the isolation of one new labdane diterpenoid, leojaponin D （1） and two new ionone derivatives, leojaponones A and B （2 and 3）, together with seven known diterpenoids （4-10）. Their structures were elucidated by extensive 1D and 2D NMR spectroscopic data and by comparison with data reported in the literature. Selected isolates were evaluated their effects on lurkat Il2 secretino.

关键词： leonurus japonicus Diterpenoid lonone derivative Jurkat Il2 secretion

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Effect of elastic domains on electromechanical response of epitaxial ferroelectric films with a three-domain architecture

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Journal of Advanced Ceramics 2013年第1期2卷 1-10页

作者： Jun OUYANG wei ZHANG SPamir AlPAY Alexander lROYTBURD Key laboratory for liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Engineering Ceramics LaboratorySchool of Materials Science and EngineeringShandong UniversityJinan 250061ShandongChina Materials Science and Engineering Program and Institute of Materials Science University of ConnecticutStorrs 06269ConnecticutUSA Department of Materials Science and Engineering University of MarylandCollege Park 20742MarylandUSA

Thermodynamics of(001)epitaxial ferroelectric films completely relaxed due to the formation of elastic domains with a three-domain architecture is *** polydomain structure and electromechanical response of such films are analyzed for two cases corresponding to immobile and mobile elastic domain *** is shown that immobile elastic domains provide additional constraint which increases the mechanical and electrical clamping,thereby significantly reducing the piezoelectric and dielectric *** the other hand,a polydomain ferroelectric film adapts to the variations in the applied electric field by reversible domain wall displacements in the case of mobile domain *** comparison of the theory with experiments shows that the elastic domain walls are mobile in the fully relaxed films of~1μm *** addition,if the substrate constraint is reduced via decreasing lateral size of a polydomain ferroelectric film,its piezoresponse will increase dramatically,as is experimentally verified on small islands of polydomain ferroelectric *** general conclusions can be readily applied to other constrained polydomain films.

关键词： ferroelectrics domains epitaxial films domain wall thermodynamics electromechanical properties

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