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Two new epimeric pairs of iridoid from mangrove plant Scyphiphora hydrophyllacea

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Chinese Chemical Letters 2007年第12期18卷 1509-1511页

作者： yan Bo Zeng Wen Li Mei You xing Zhao ling Zhuang Kui Hong Hao Fu Dai State Key Biotechnology Laboratory of Tropical Crops institute of Tropical Bioscience and Biotechnology Chinese Academy of Tropical Agricultural Sciences Haikou 571101 China State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming institute of Botany Chinese Academy of Sciences Kunming 650204 China

Two new epimeric pairs of iridoid scyphiphin A1 （la）, A2 （lb） and scyphiphin B 1 （2a）, B2 （2b） were isolated from Scyphiphora hydrophyllacea Gaertn. F. Their structures were elucidated by spectroscopic methods. The mixture of scyphiphin B 1 and scyphiphin B2 showed moderate cytotoxicity against human hepatoma SMMC-7721 cell line in vitro by MTT method.

关键词： Scyphiphora hydrophyllacea Gaertn. E Iridoid Cytotoxicity SMMC-7721

PXR:a center of transcriptional regulation in cancer

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Acta Pharmaceutica Sinica B 2020年第2期10卷 197-206页

作者： Yaqi xing Jiong yan Yongdong Niu Department of Pharmacology Shantou University Medical CollegeShantou 515041China Center for Pharmacogenetics University of PittsburghPA 15261USA

Pregnane X receptor(PXR,NR 112)is a prototypical member of the nuclear receptor *** can be activated by both endobiotics and *** a key xenobiotic receptor,the cellular function of PXR is mostly exerted by its binding to the regulatory gene sequences in a liganddependent *** downstream target genes of PXR participate in xenobiotic responses,such as detoxification,metabolism and *** evidence also implicates PXR signaling in the processes of apoptosis,cell cycle arrest,proliferation,angiogenesis and oxidative stress,which are closely related to ***,we discussed,in addition to the characterization of PXR per se,the biological function and regulatory mechanism of PXR signaling in cancer,and its potential for the targeted prevention and therapeutics.

关键词： PXR NR1I2 PAR Signaling Nuclear receptor Transcriptional regulation Cancer

Effects of built-in electric field and donor impurity on linear and nonlinear optical properties of wurtzite InxGa1-xN/GaN nanostructures

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Chinese Physics B 2020年第8期29卷 479-484页

作者： Xiao-Chen yang yan xing School of Physical Science and Technology Inner Mongolia UniversityHohhot 010021China

The linear and nonlinear optical absorption coefficients(ACs)and refraction index changes(RICs)of 1s-1p,1p-1d,and 1f-1d transitions are investigated in a wurtzite InxGa1-xN/GaN core-shell quantum dot(CSQD)with donor impurity by using density matrix *** effects of built-in electric field(BEF),ternary mixed crystal(TMC),impurity,and CSQD size are studied in *** finite element method is used to calculate the ground and excited energy state energy and wave *** results reveal that the BEF has a great influence on the linear,nonlinear,and total ACs and *** presence of impurity leads the resonant peaks of the ACs and RICs to be blue-shifted for all transitions,especially for 1s-1p *** is also found that the resonant peaks of the ACs and RICs present a red shift with In-composition decreasing or core radius ***,the amplitudes of the ACs and RICs are strongly affected by the incident optical *** absorption saturation is more sensitive without the impurity than with the impurity,and the appearance of absorption saturation requires a larger incident optical intensity when considering the BEF.

关键词： core-shell quantum dot linear and nonlinear optical properties impurity ternary mixed crystal

Experimental demonstration of separating the wave-particle duality of a single photon with the quantum Cheshire cat

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Light(Science & Applications) 2023年第1期12卷 128-135页

作者： Jia-Kun Li Kai Sun yan Wang Ze-yan Hao Zheng-Hao Liu Jie Zhou xing-yan Fan Jing-ling Chen Jin-Shi Xu Chuan-Feng Li Guang-Can Guo CAS Key Laboratory of Quantum Information University of Science and Technology of China230026 HefeiChina CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China230026 HefeiChina Hefei National Laboratory University of Science and Technology of China230088 HefeiChina Theoretical Physics Division Chern Institute of MathematicsNankai University300071 TianjinChina

As a fundamental characteristic of physical entities,wave-particle duality describes whether a microscopic entity exhibits wave or particle attributes depending on the specific experimental *** assumption is premised on the notion that physical properties are inseparable from the objective ***,after the concept of the quantum Cheshire cats was proposed,which makes the separation of physical attributes from the entity possible,the premise no longer ***,an experimental demonstration of the separation of the wave and particle attributes inspired by this scenario remains *** this work,we experimentally separated the wave and particle attributes of a single photon by exploiting the quantum Cheshire cat concept for the first *** applying a weak disturbance to the evolution of the system,we achieve an effect similar to the quantum Cheshire cat and demonstrated the separation of the wave and particle attributes via the extraction of weak *** work provides a new perspective for the in-depth understanding of wave-particle duality and promotes the application of weak measurements in fundamentals of quantum mechanics.

关键词： quantum duality particle

Arterial embolism caused by a peripherally inserted central catheter in a very premature infant:A case report and literature review

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World Journal of Clinical Cases 2020年第18期8卷 4259-4265页

作者： Yi-Fei Huang yan-ling Hu xing-Li Wan Hong Cheng Yao-Hua Wu Xiao-yan yang Jing Shi Department of Neonatal Nursing West China Second University HospitalSichuan UniversityChengdu 610066Sichuan ProvinceChina Key Laboratory of Birth Defects and Related Diseases of Women and Children Sichuan UniversityChengdu 610066Sichuan ProvinceChina Ministry of Education West China Nursing SchoolSichuan UniversityChengdu 610066Sichuan ProvinceChina

BACKGROUND Extremely premature infants have poor vascular *** often choose deep veins such as the femoral vein and axillary vein to peripherally insert central catheters,and these vessels are often accompanied by arteries;thus,it is easy to mistakenly enter the *** SUMMARY The case of an extremely premature infant(born at gestational age 28+3)in whom the left upper extremity artery was accidentally entered during peripheral puncture of the central venous catheter is *** the 19th day of hospitalization,the index finger,middle finger and ring finger of the left hand were rosy,the left radial artery and brachial artery pulse were palpable,the recovery was 95%,and the improvement was *** discharge 42 d after admission,there was no abnormality in fingertip activity during the follow-up *** Arterial embolization in preterm infants requires an individualized treatment strategy combined with local anticoagulation and 2%nitroglycerin ointment for local tissue damage caused by arterial embolism in the upper *** visualization of disease changes using image visualization increases the likelihood of a good outcome.

关键词： Arterial thrombosis Anticoagulation Nitroglycerin Peripherally inserted central catheters Case report

Anchor single atom in h-BN assist NO synthesis NH_(3):a computational view

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Rare Metals 2022年第10期41卷 3456-3465页

作者： Chao-Zheng He Ya-xing Zhang Jia Wang ling Fu Institute of Environment and Energy Catalysis Shaanxi Key Laboratory of Optoelectronic Functional Materials and DevicesSchool of Materials Science and Chemical EngineeringXi’an Technological UniversityXi’an710021China College of Resources and Environmental Engineering Tianshui Normal UniversityTianshui741001China

Synthesis of ammonia gas through environmental protection and low-cost electrocatalysis is one of the ways to solve the current human energy ***,through the study of density functional theory(DFT),a series of transition metal single atoms are embedded in the defect-containing h-BN to construct a TM@B_(2) N_(2)(TM=Ti-Zn,Nb-Ag) two-dimensional *** activation effect of these single-atom catalysts on NO molecules and the electrochemical performance of catalyzing NO reduction reaction(NORR)were *** reaction pathways are studied in detail,and competition between hydrogen proton and ammonia(NH3) oxidation with NORRs is also *** the16 transition metal atoms we studied,the intercalation of Pb atom into h-BN has the best catalytic *** reaction rate-limiting potential of NORR is only 0.55 eV,and the surface HER reaction and ammonia oxidation can be effectively *** is hoped that our research can further promote the application of h-BN in the field of catalysis and provide some guidance for experimental workers in the field of ammonia synthesis.

关键词： Density functional theory(DFT)calculations Nitric oxide reduction reaction Electrocatalytic activity Ammonia Single-atom catalysts

Morphology and Phase Composition of Gelatin-Starch Blends

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Chinese Journal of Polymer Science 2014年第1期32卷 108-114页

作者： xing-xun Liu yan-fei Wang Nuo-zi Zhang Robert A.Shanks Hong-sheng Liu Zhen Tong ling Chen 余龙 Centre for Polymers from Renewable Resources ERCPSP SCUT School of Materials Science and Engineering SCUT School of Applied Science RMIT University CSIRO Materials Science and Engineering

Morphology and phase compositions of different starch-gelatin blends were investigated by various microscopes： optical, SEM and synchrotron FTIR microscopy. A high amylose （80%） corn starch, grafted with hydroxypropyl to enhance flexibilty and hydrophilicity, and plasticized by poly（ethylene glycol）（PEG）, was used in this work. SEM revealed that the surface became smoother after adding PEG. Optical microscopy observation revealed that compatibility between gelatin and starch was improved by adding PEG. An FTIR beam focused on a 5 ~tm x 5 ~tm detection area by the micro-spectroscope was used to map chemical composition. The ratio of areas of the saccharide bands （1180-953 cm-1） and the amide I and II bands （1750-1483 cm-1） was used to monitor the relative distributions of the two components in the blends. The FTIR maps indicated that gelatin constituted the continuous phase up to 80% of starch content. All of the FTIR spectra showed contributions from both starch and gelatin absorptions, therefore indicating that complete demixing with pure starch and gelatin domains did not occur. The PEG improved the compatibility of the gelatin-starch blends.

关键词： Biopolymer Drug capsule Starch Gelatin Morphology Phase FTIR Synchrotron.

Resilient performance of self-centering hybrid rocking walls with curved interface under pseudo-static loading

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Earthquake Engineering and Engineering Vibration 2024年第1期23卷 65-85页

作者： Su xing yan Shi Sun Xianglei Wang Tao School of Civil Engineering Shenyang Jianzhu UniversityShenyang 110168China PetroChina East China Design Institute Co. Ltd.Qingdao 266000China Qingdao Country Garden Bolin Real Estate Co. Ltd.Qingdao 266100China

Frame and rocking wall(FRW)structures have excellent resilient performance during ***,the concrete at interfacial corners of rocking walls(RWs)is easily crushed due to local extreme compression during the rocking *** innovative RW with a curved interface is proposed to prevent interfacial corners from producing local damage,enhancing its earthquake resilient performance(ERP).The precast wall panel with a curved interface is assembled into an integral self-centering hybrid rocking wall(SCRW)by two post-tensioned unbonded prestressed ***,two ordinary energy dissipation steel rebars and two shear reinforcements are arranged to increase the energy dissipation capacity and lateral *** SCRW specimens and one monolithic reinforced concrete(RC)shear wall(SW)were tested under pseudo-static loading to compare the ERPs of the proposed SCRW and the SW,focusing on studying the effect of the curved interface on the *** key resilient performance of rocking effects,failure modes,and hysteretic properties of the SCRW were *** results show that nonlinear deformations of the SCRW are concentrated along the interface between the SCRW and the foundation,avoiding damage within the *** restoring force provided by the prestressed tendons can effectively realize self-centering capacity with small residual deformation,and the resilient performance of the SCRW is better than that of monolithic *** addition,the curved interface of the SCRW makes the rocking center change and move inward,partially relieving the stress concentration and crush of *** rocking range of the rocking center is about 41.4%of the width of the SCRW.

关键词： self-centering hybrid rocking wall(SCRW) monolithic shear wall(SW) earthquake resilient performance(ERP) curved interface rocking center

The flow characteristics around bridge piers under the impact of a ship

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Journal of Hydrodynamics 2020年第6期32卷 1165-1177页

作者： yan-fen Geng Hua-qiang Guo xing Ke School of Transportation Southeast UniversityNanjing211189China

The complicated flow structure around the pier threatens the safe navigation of *** paper studies the mechanism of the flow with a ship around the pier,passing or not passing and with consideration of the interval between the ship and the *** flow field model and the moving ship model are constructed by the six degrees of freedom(6DOF)solver combined with the virtual unit immersed boundary method and the level set method,both of which are based on the three-dimensional Navier-Stokes *** simulation results show that the ship significantly influences the flow around the pier,increasing the flow velocity by 50%to 140%.Away from the bridge pier,the cross-flow velocity *** cross-flow velocity near the side of the pier also increases but in the opposite *** ship is affected by the negative yaw moment because of the reverse cross-flow between the pier and the *** size of the ship has an important impact on the extent of the affected flow areas but the velocity distribution is roughly in the same *** results show double impacts of ship and pier should be considered when determining the safe area of navigation.

关键词： Bridge pier flow around cylinder moving ship model