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Micromagnetic simulation of Au interlayer in L1_0-FePt nanocomposite recording medium

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Rare Metals 2017年第2期36卷 108-112页

作者： Sa-Zi Li Su-fen zhao Yong Xie Zi-Yu Chen Department of Physics Beijing University of Aeronautics and Astronautics Laboratory of Device National Center for Nanoscience and Technology

Owing to the epitaxial inducement of Au atom,Au interlayer was introduced to increase the perpendicular anisotropy and the coercivity in L10-FePt nanocomposite *** can be used to reveal the relationship between microstructure and magnetic properties of materials,and give the information of the perpendicular anisotropy and *** this work,the effect of the Au interlayer on annealed[Fe（0.5 nm）/Pt（0.5 nm）/Au（d nm）]10 nanocomposite recording medium by a micromagnetic model was *** model contains three phases：hard magnetic phase,soft magnetic phase,and nonmagnetic *** calculated result shows that perpendicular orientation degree of the texture and proportion of a hard magnetic phase to the total phase in the annealed film are both enhanced by increasing Au interlayer *** result can be conducive to the improvement of the perpendicular anisotropy and the coercivity of the FePt nanocomposite film in the experiments.

关键词： FePt multilayer Magnetic recording materials Perpendicular anisotropy Micromagnetic simulation

Influence of Teflon Substrate on Crystallization and Enzymatic Degradation of Polymorphic Poly(butylene adipate)

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Chinese Journal of Polymer Science 2014年第9期32卷 1243-1252页

作者： Zhen-bo Ning Ronnie Nielsen Li-fen zhao Dong-hong Yu 甘志华 CAS Key Laboratory of Engineering Plastics Institute of Chemistry Chinese Academy of Sciences (CAS) The Graduate University of Chinese Academy of Sciences Aalborg University Section of Chemistry Department of Life Sciences Aalborg University DK-9000 Aalborg Denmark College of Materials Science and Engineering Shandong University of Science and Technology State Key Laboratory of Organic-inorganic Composites Beijing University of Chemical Technology

Oriented and non-oriented Teflon films, which were found to have the same crystalline structure, but different surface morphologies, were used to sandwich poly（butylene adipate）（PBA） films during isothermal crystallization. It was found that both the Teflon surface structure and the PBA polymorphic structure are the determining factors to induce epitaxial crystallization. The oriented Teflon film was able to induce epitaxial crystallization of PBA α crystal, while the non-oriented Teflon did not induce any epitaxial crystallization of PBA. Epitaxial crystallization did not occurred for PBA β crystals between neither the oriented nor the non-oriented Teflon films. The enzymatic degradation rate of PBA films was not determined by the epitaxial crystallization, in fact it was still dependent on the polymorphic crystal structure of PBA. The morphological changes of PBA films after enzymatic degradation confirmed again that the epitaxial crystallization only occurred for the PBA film with α crystal structure which was produced by being sandwiched between oriented Teflon films, and it happened only on the surface of PBA films.

关键词： Poly(butylene adipate) Epitaxial crystallization Polymorphic crystals Enzymatic degradation Morphology.

New compounds from the roots of Coriaria nepalensis

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Chinese Chemical Letters 2018年第3期29卷 467-470页

作者： fen zhao Yunbao Liu Shuanggang Ma Dequan Yu Shishan Yu State Key Laboratory of Bioactive Substance and Function of Natural Medicines Institute of Materia Medica Chinese Academy of Medical Sciences and Peking Union Medical College Beijing Advanced Innovation Center for Food Nutrition and Human Health Beijing Engineering and Technology Research Center of Food Additives Beijing Technology & Business University

One new sesquiterpene lactone, corialactone E （1）, one new neolignan, coriarianeolignan A （2）, together with three known apocarotenoids （3-5） and one known neolignan （6） have been isolated from a CHCI3 extract of the roots of Coriaria nepalensis. The structures including absolute configurations of 1-6 were elucidated through extensive NMR, HR-ESIMS, and CD data analysis. Structurally, compound I possessed novel variations in the structure, including the newly formed ether ring of C-3/O/C-9 and the lactone ring connecting C-13 and C-5. Compound 5 showed cytotoxic activity against SKOV3 （human ovarian cancer） cells with IC50 values of 4.67 μmol/L. In vivo system, compound 3 showed anti-convulsant activity by 34% at the dose of 5 mg/kg.

关键词： Coriaria nepalensis Sesquiterpene Lactone Neolignan Cytotoxicity Anti-convulsant

Improved Electrochemical Synthesis of Nitro-substituted 1-Aryl-2-pyrrolidinecarbonitriles

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Chinese Chemical Letters 2006年第6期17卷 736-738页

作者： Wei LIU Yuan MA Ying Wu YIN Yu fen zhao The Key Laboratory for Bioorganic Phosphorus Chemistry ＆ Chemical Biology Ministry of Education Department of Chemistry Tsinghua University Beijing 100084 Department of Chemistry Tsinghua UniversityBeijing 100084 Beijing TH-UNIS Insight Co.Ltd. Beijing 100084

In this paper, we described an improved electrochemical method for synthesis of some 1-aryl-2-pyrrolidinecarbonitrile derivatives bearing an electron-withdrawing group （NO2）. The electrochemical synthesis of titile ... 详细信息

关键词： Anodic cyanation nitrile pyrrolidine electrochemistry.

CRISPR/Cas9-engineered mutation to identify the roles of phytochromes in regulating photomorphogenesis and flowering time in soybean

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The Crop Journal 2022年第6期10卷 1654-1664页

作者： fen zhao Xiangguang Lyu Ronghuan Ji Jun Liu Tao zhao Hongyu Li Bin Liu Yanxi Pei School of Life Science and Shanxi Key Laboratory for Research and Development of Regional Plants Shanxi UniversityTaiyuan 030006ShanxiChina The National Key Facility for Crop Gene Resources and Genetic Improvement Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China

Soybean(Glycine max)responds to ambient light variation by undergoing multiform morphological alterations,influencing its yield potential and stability in the ***(PHYs)are plant-specific red(R)and far-red(FR)light photoreceptors mediating photomorphogenesis and photoperiodic *** an ancient tetraploid,soybean harbors four PHYA,two PHYB,and two PHYE *** for GmPHYA2/E4 and GmPHYA3/E3,which have been identified as photoperiod-dependent flowering repressors,the functions of GmPHYs are still largely *** generated a series of individual or combined mutations targeting the GmPHYA or GmPHYB genes using CRISPR/Cas9 *** analysis revealed that GmPHYB1 mediates predominantly R-light induced photomorphogenesis,whereas GmPHYA2/E4 and GmPHYA3/E3,followed by GmPHYA1 and GmPHYB2,function redundantly and additively in mediating FR light responses in seedling ***2/E4 and GmPHYA3/E3,with weak influence from GmPHYA1 and GmPHYA4,delay flowering time under natural long-day *** study has demonstrated the diversified functions of GmPHYAs and GmPHYBs in regulating light response,and provides a core set of phytochrome mutant alleles for characterization of their functional mechanisms in regulating agronomic traits of soybean.

关键词： Soybean Phytochrome CRISPR/Cas9 Photomorphogenesis Flowering time

Polydentate cyclotriphosphazene ligands:Design,synthesis and bioactivity

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Chinese Chemical Letters 2009年第1期20卷 58-61页

作者： Le Wang Yong Ye Shang Bin Zhong Yu fen zhao Key Laboratory of Chemical Biology and Organic Chemistry Department of Chemistry Zhengzhou University Zhengzhou 450052 China Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education) Department of Chemistry Tsinghua University Beijing 100084 China

Five multinuclear cyclotriphosphazene ligands were synthesized and tested for their cleavage activities to plasmid DNA. All of these new compounds were confirmed by MS, ^1H NMR, ^31P NMR, ^13C NMR and IR. Preliminary studies on the cleavage of pUC19 DNA in the presence of metal complexes were performed. The results revealed that these complexes could act as powerful catalysts under physiological conditions. The complexes 3b ＋ Cu can effectively cleave DNA to nicked form, giving hydrolysis rate constant of 0.08/h under physiological conditions. An acid-base catalyzed DNA phosphate-diester hydrolysis mechanism was also orooosed.

关键词： Cyclotriphosphazene Polydentate ligand DNA cleavage Hydrolysis

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复方醋酸氟轻松酊有关物质测定方法研究

北方药学 2024年第6期21卷 10-13,20页

作者：赵粉荣刘卫东刘斌内蒙古大唐药业股份有限公司/内蒙古盛唐国际蒙医药研究院/内蒙古自治区蒙药新药研发企业重点实验室内蒙古呼和浩特010010

目的:建立复方醋酸氟轻松酊中有关物质的检测方法。方法:色谱柱为Ultimate LP-C18(250*4.6mm,5μm),流动相为55%甲醇水溶液,流速为1.0 mL/min,检测波长为235nm和245nm,柱温为30℃,进样量为10μL。结果:专属性试验中,已知杂质与主峰及杂... 详细信息

目的:建立复方醋酸氟轻松酊中有关物质的检测方法。方法:色谱柱为Ultimate LP-C18(250*4.6mm,5μm),流动相为55%甲醇水溶液,流速为1.0 mL/min,检测波长为235nm和245nm,柱温为30℃,进样量为10μL。结果:专属性试验中,已知杂质与主峰及杂质与杂质峰之间分离度大于2.0,各峰间分离良好;系统适用性试验中,峰面积RSD值为1.42%,保留时间RSD值为0.84%;溶液稳定性试验中,醋酸氟轻松原料药溶液24h内杂质极差变化小于0.05%;精密度试验中,氟轻松测定12次的结果极差在0.1%以内;定量限和检测限试验中,氟轻松定量限浓度为供试品浓度(0.4mg/mL)0.032%;线性与范围试验中,醋酸氟轻松在0.30μg/mL~6.04μg/mL范围内线性关系良好,方程:y=16807 x+3692.8;准确度试验中,氟轻松回收率在80.0%~120.0%,平均回收率为100.5%,RSD为1.5%;耐用性试验中,改变条件后测得单杂和总杂含量变化在0.1%之间。结论:该方法专属性强、灵敏度好、准确度高,可用于复方醋酸氟轻松酊中有关物质的检测。

关键词：复方醋酸氟轻松酊有关物质高效液相色谱仪

Preparation and characterization of silicone-oil-based γ-Fe2O3 magnetic fluid

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Rare Metals 2018年第9期37卷 803-807页

作者： Hang Zheng Hui-Ping Shao Tao Lin Zi-fen zhao Zhi-Meng Guo Institute for Advanced Material and Technology University of Science and Technology Beijing Beijing 100083 China

In this study, silicone-oil-based γ-Fe2O3 mag- netic fluid was successfully prepared by thermal oxidizing of Fe3O4 magnetic nanoparticles, which were prepared by chemical co-precipitation with FeSO4-7H2O and FeCl3- 6H2O, and their surface was modified by oleate ligands. Silicone oil was used as carrier liquid and oleic acid was as surfactant for preparing γ-Fe2O3 magnetic fluid. It is found that the Fe3O4 nanoparticles surrounded by oleate ligands are not damaged during the thermal oxidizing. The shape of γ-Fe2O3 magnetic nanoparticles prepared is similar to spherical, and their mean size is about 10-20 nm, which has nothing obvious difference compared with Fe3O4. Thesaturation magnetization of γ-Fe2O3 magnetic fluid pre-pared is 14.25 ***-1 and that of γ-Fe2O3 nanoparti-cles is 57.56 ***-1. The needle of γ-Fe2O3 magneticfluid is much bigger than that of Fe3O4 magnetic fluidunder the same magnetic field, which shows better mag-netic properties.

关键词： Fe3O4 magnetic particles γ-Fe2O3 magneticparticles γ-Fe2O3 magnetic fluid Saturation magnetization

Investigation of Spontaneous Condensation of an Amino Acid Based Amphiphile on Cast Film by in situ Transmission FT-IR Spectroscopy

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Chinese Chemical Letters 2005年第12期16卷 1637-1640页

作者： Hai Yan WANG Yan Mei LI Yi XIAO Yu fen zhao The Key Laboratory of Bioorganic Phosphorus Chemistry ＆ Chemical Biology （Ministry of Education） Department of Chemistry Tsinghua University Beijing 100084

The spontaneous condensation of the amphiphilic N-（O,O-dihexadecyl）phosphorylalanine on the cast film was observed by in situ investigation of transmission infrared spectroscopy The particular orientation and ordered packing of the monomers within the multilayers of the cast film is concluded to attribute to the spontaneous condensation between the monomers.

关键词： Amphiphile cast film condensation FT-IR N-(O O-dihexadecyl)phosphoryl alanine