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Synthesis and Stereochemistry of New Cyclic Phosphate-phosphonates

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Chinese Chemical Letters 1997年第1期8卷 11-12页

作者： Zhou, J chen, RY NANKAI UNIV NATL KEY LAB ELEMENTOORGAN CHEMINST ELEMENTOORGAN CHEMTIANJIN 300071PEOPLES R CHINA

The novel cyclic phosphate-phosphqnates,cis/trans-2-phosp dimethyl-1,3,2-dioxaphosphorinane 2-sulfides(selenides) (7a-f),were synthesized by a one-pot reaction using tris(diethviamino)phosphine activated by iodine as the phosphorylating and ring-closing reagent in good overall yields. The geometric stereoisomers were isolated and characterized. A cis-configuration and a chair preferred conformation of one isomer of 7b were established by X-ray diffraction analysis.

关键词： Synthesis and Stereochemistry of New Cyclic Phosphate-phosphonates

A novel hanging bowl-shaped mask for the fabrication of vertical sidewall structures

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Frontiers of physics 2016年第1期11卷 111-114页

作者： Dongxue chen Qian Liu National Center for Nanoscience and Technology Beijing 100190 China University of Chinese Academy of Sciences Beijing 100080 China

Contact exposure is expected to occur in conventional lithography, and can be a source of process deviations （such as shrinking and distortion of templates） during reactive ion etching and inductively coupled plasma etching, as these deviations are induced by ion bombardment. This typically results in undesired sidewall effects, such as lower sidewall angles. Here we report a novel hanging bowlshaped lithography mask that can effectively minimize sidewall effects in lithography applications. As a test case, standard silicon carbide pillars with vertical sidewalls are fabricated using this mask. The mask could be used for fabrication of high-aspect-ratio structures with ultra-violet lithography.

关键词： UV lithography hanging bowl-shaped mask sidewall effects ICP SiC

A Remark on Steinness

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Chinese Annals of Mathematics,Series B 2007年第2期28卷 161-164页

作者： Chaohui ZHOU Zhihua chen Department of Applied Mathematics Tongji University Shanghai 200092 China.

In this paper, the authors prove that if Mn is a complete noncompact Kaehler manifold with a pole p, and its holomorphic bisectional curvature is asymptotically nonnegative to p, then it is a Stein manifold.

关键词： Holomorphic bisectional curvature Plurisubharmonic Smooth Exhausting

Inhibition of α/β-K_6P_2W_(18)O_(62)·10H_2O on the Activity of Mushroom Tyrosinase and Its Antimicrobial Effects

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Chemical Research in Chinese Universities 2012年第5期28卷 862-865页

作者： HU Xi-yu chen Bing-man WANG Li chen Fa-he School of Bioengineering Jimei UniversityXiamen 361021P.R.China Yanwu Affiliated Hospital of Zhongshan Hospital Xiamen University(Xiamen University Hospital)Xiamen 361005P.R.China

Dawson-type phosphotungstic polyoxometalate α/β-K6P2W18O62·10H2O（P2W18） was synthesized and its inhibitory effect on the mushroom tyrosinase was investigated. It could inhibit diphenolase activity of mushroom tyrosinase as an irreversible inhibitor. When the concentration of the enzyme reached 0.0176 mg/mL, the concentration of P2W18 leading to 50% activity lost（IC50） was 0.05 mmol/L for monophenolase and 0.64 mmol/L for diphenolase. In addition, the antimicrobial activity of P2W18 was evaluated by zone of inhibition test. The results show that P2W18 possesses effective antimicrobial ability against Escherichia coli, Bacillus subtilis, yeast, especially Escherichia coli and yeast.

关键词： Polyoxometalate Mushroom tyrosianse Inhibition Antimicrobial activity

SARS coronavirus papain-like protease inhibits the type I interferon signaling pathway through interaction with the STING-TRAF3- TBK1 complex

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Protein & Cell 2014年第5期5卷 369-381页

作者： Xiaojuan chen Xingxing Yang Yang Zheng Yudong Yang Yaling Xing Zhongbin chen Division of Infection and Immunity Department of Electromagnetic and Laser Biology Beijing Institute of Radiation Medicine_ Beijing 100850 China Anhui Medical University Hefei 230032 China

SARS coronavirus （SARS-CoV） develops an antagonis- tic mechanism by which to evade the antiviral activities of interferon （IFN）. Previous studies suggested that SARS-CoV papain-like protease （PLpro） inhibits activa- tion of the IRF3 pathway, which would normally elicit a robust IFN response, but the mechanism（s） used by SARS PLpro to inhibit activation of the IRF3 pathway is not fully known. In this study, we uncovered a novel mechanism that may explain how SARS PLpro effi- ciently inhibits activation of the IRF3 pathway. We found that expression of the membrane-anchored PLpro domain （PLpro-TM） from SARS-CoV inhibits STING/ TBKl/IKKE-mediated activation of type I IFNs and dis- rupts the phosphorylation and dimerization of IRF3, which are activated by STING and TBKI. Meanwhile, we showed that PLpro-TM physically interacts with TRAF3, TBK1, IKK~, STING, and IRF3, the key components that assemble the STING-TRAF3-TBK1 complex for activa- tion of IFN expression. However, the interaction between the components in STING-TRAF3-TBK1 complex is dis- rupted by PLpro-TM. Furthermore, SARS PLpro-TM reduces the levels of ubiquitinated forms of RIG-I, STING, TRAF3, TBK1, and IRF3 in the STING-TRAF3- TBK1 complex. These results collectively point to a new mechanism used by SARS-CoV through which PLpro negatively regulates IRF3 activation by interaction withSTING-TRAF3-TBK1 complex, yielding a SARS-CoV countermeasure against host innate immunity.

关键词： SARS coronavirus papain-like protease,interferon deubiquitinase STING-TRAF3-TBK1 complex

High Order IMEX Stochastic Galerkin Schemes for Linear Transport Equation with Random Inputs and Diffusive Scalings

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Communications on Applied Mathematics and Computation 2024年第1期6卷 325-339页

作者： Zheng chen Lin Mu Department of Mathematics University of Massachusetts Dartmouth285 Old Westport RoadDartmouth02747MAUSA Department of Mathematics University of GeorgiaAthens30602GAUSA

In this paper,we consider the high order method for solving the linear transport equations under diffusive scaling and with random *** tackle the randomness in the problem,the stochastic Galerkin method of the generalized polynomial chaos approach has been ***,the high order implicit-explicit scheme under the micro-macro decomposition framework and the discontinuous Galerkin method have been *** provide several numerical experiments to validate the accuracy and the stochastic asymptotic-preserving property.

关键词： Stochastic Galerkin scheme linear transport equations generalized polynomial approach stochastic asymptotic-preserving property

Industrialization of High Performance Sintered NdFeB Magnets

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Journal of Rare Earths 2004年第Z1期22卷 118-121页

作者： chen Beixin Wang Biao Material Science and Engineering Xi''an Jiaotong University Xi''an 710049 China Yantai Shougang Magnetic Materials Inc. Yantai 265500 China Yantai Shougang Magnetic Materials Inc.Yantai 265500 China

Sintered Nd-Fe-B magnet was manufactured by advanced equipment via a SC (Strip casting) *** has integrative performance.

关键词： sintered Nd-Fe-B magnet manufacture process microstructure magnetic properties

The effects of high temperature level on square Bt protein concen-tration of Bt cotton

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Journal of Integrative Agriculture 2015年第10期14卷 1971-1979页

作者： WANG Jun chen Yuan YAO Meng-hao LI Yuan WEN Yu-jin chen Yuan ZHANG Xiang chen De-hua Jiangsu Provincial Key Laboratory of Crops Genetics and Physiology Yangzhou University Yangzhou 225009 P.R. China Department of Soil and Crop Sciences Texas A&M University College Station TX77843 USA Syngenta Biotechnology Inc. Carry NC 27519 USA

Higher boll worm survival rates were detected after high temperature presented during square period in Bt cotton. The objective of this study was to investigate the effects of high temperature level on the Bt efficacy of two different types of Bt cotton cultivars at squaring stage. During the 2011 to 2013 cotton growth seasons, high temperature treatments ranged from 34 to 44°C in climate chambers, and field experiments under high temperature weather with various temperature levels were conducted to investigate the effects of the high temperature level on square Bt protein concentration and nitrogen metabolism. The climate chamber experiments showed that the square insecticidal protein contents reduced after 24 h elevated temperature treatments for both cultivars, whereas significant declines of the square insecticidal protein contents were detected at temperature 〉38°C, and only slightly numerical reductions were observed when temperature below 38°C. Similar high temperature responses were also observed at the two field experimental sites in 2013. Correspondingly, high temperature below 38°C seems have little effect on the square amino acid concentrations, soluble protein contents, glutamic-pyruvic transaminase（GPT） and glutamic-oxalacetic transaminase（GOT） activities as well as protease and peptidase activities; however, when the temperature was above 38°C, reduced soluble protein contents, enhanced amino acid concentrations, decreased GPT and GOT activities, bolstered protease and peptidase activities in square were detected. In general, the higher the temperature is（〉38°C）, the larger the changes for the above compound contents and key enzymes activities of the square protein cycle. The findings indicated that the unstable insect resistance of the square was related to high temperature level during square stage.

关键词： Bt cotton square high temperature level stress Bt protein nitrogen metabolism

The Assembly of C60 in Semicrystalline PLLA Matrix

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Nano-Micro Letters 2012年第1期4卷 30-33页

作者： Li chen Xiujiang Pang Key Lab of Rubber-plastics of Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics Qingdao University of Science & Technology (QUST) College of Chemistry and Molecular Engineering QUST

It has increasingly become a research focus to build higher structure composed of C60. However, there has been very few reports on the influence of polymer addition on the self-assembling behavior of fullerene in organic solvents. In this research, big needle-like C60 assemblings have been obtained in the form of PLLA/C60 composites. The largest C60 needles can be observed by naked eyes. The amount of C60 in the composite influences the length of C60 needles to some extent. DSC results indicate C60 accelerates the crystallization and lift the relative crystallinity of PLLA matrix. the results also imply the addition of semicrystalline PLLA influence the assembling behavior of C60. i.e., the crystallization of PLLA accelerated by C60 also act a driving force for the enriching and the linear assembling of C60 in PLLA matrix via Van der Waals force.

关键词： C60 Poly(L-lactide acid)(PLLA) Assembling