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Ferromagnetic interactions in EO-azido-bridged binuclear transition metal(Ⅱ) systems: Syntheses, crystal structures and magnetostructural correlations

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Science China Chemistry 2012年第6期55卷 942-950页

作者： ZHANG ShiYuan WANG BingWu xu na SHI Wei GAO Song CHENG Peng Key Laboratory of Advanced Energy Materials Chemistry (MOE) Department of Chemistry Nankai University Beijing national Laboratory for Molecular Sciences Beijing 100190 China State Key Lab of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular Engineering Peking University Beijing 100871 China

Three new isostructural binuclear transition metal complexes with azido ion and 1,2-bis（3-（pyridin-2-yl）-lH-pyrazol-1- yl）ethane （bppe）, formulated as [M2（N3）2（bppe）2]（C104）2 （M = Co, 1; Ni, 2; Cu, 3）, were successfully synthesized. They were structurally and magnetically characterized. In 1-3, the double azido ions link two adjacent octahedral metal centers together in the end-to-on mode （EO）, with the M-NEo-M angles of 99.41°, 100.24° and 99.80°, respectively. The co-ligand bppe acts as terminal ligand to saturate the remaining coordination sites. The magnetic properties of 1-3 have been investigated in the tem- perature range of 2-300 K. Fitting of the magnetic susceptibility data revealed the occurrence of the strong ferromagnetic in- teractions [J = 26.32 cm-1 （1）, J = 38.23 cm-1 （2） and J = 139.83 cm-1 （3）]. Density functional theory calculations have been performed on 1-3 to provide a magneto-structural correlation of the ferromagnetic behavior.

关键词： crystal structure binuclear complex magnetic property DFT calculation

Ground State Solutions for Schrdinger-Poisson Systems

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Chinese Quarterly Journal of Mathematics 2016年第1期31卷 9-18页

作者： xu na School of Science Tianjin University of Technology and Education

This paper deals with a class of Schr¨odinger-Poisson systems. Under some conditions, we prove that there exists a ground state solution of the system. The proof is based on the compactness lemma for the system. Our ... 详细信息

关键词： Schrdinger-Poisson system ground state solution compactness

Fusion SST from Infrared and Microwave Measurement of FY-3D Meteorological Satellite

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Journal of Tropical Meteorology 2024年第1期30卷 89-96页

作者：张淼徐娜陈林 national Satellite Meteorological Center/national Center for Space Weather Beijing 100081 China Innovation Center for Fengyun Meteorological Satellite(FYSIC) Beijing 100081 China Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites China Meteorological AdministrationBeijing 100081 China

Sea surface temperature(SST)is one of the important parameters of global ocean and climate research,which can be retrieved by satellite infrared and passive microwave remote sensing *** satellite infrared SST offers high spatial resolution,it is limited by cloud *** the other hand,passive microwave SST provides all-weather observation but suffers from poor spatial resolution and susceptibility to environmental factors such as rainfall,coastal effects,and high wind *** achieve high-precision,comprehensive,and high-resolution SST data,it is essential to fuse infrared and microwave SST *** this study,data from the Fengyun-3D(FY-3D)medium resolution spectral imager II(MERSI-II)SST and microwave imager(MWRI)SST were ***,the accuracy of both MERSIII SST and MWRI SST was verified,and the latter was bilinearly interpolated to match the 5km resolution grid of MERSI *** pretreatment and quality control of MERSI SST and MWRI SST,a Piece-Wise Regression method was employed to correct biases in MWRI ***,SST data were selected based on spatial resolution and accuracy within a 3-day window of the analysis ***,an optimal interpolation method was applied to fuse the FY-3D MERSI-II SST and MWRI *** results demonstrated a significant improvement in spatial coverage compared to MERSI-II SST and MWRI ***,the fusion SST retained true spatial distribution details and exhibited an accuracy of–0.12±0.74℃compared to OSTIA *** study has improved the accuracy of FY satellite fusion SST products in China.

关键词： SST data fusion FY3 infrared microwave

Transcription factor PagLBD21 functions as a repressor of secondary xylem development in Populus

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Forestry Research 2022年第1期2卷 184-192页

作者： Hao Li Shiguang Yin Linjing Wang na xu Lijun Liu State Forestry and Grassland Administration Key Laboratory of Silviculture in downstream areas of the Yellow River College of ForestryShandong Agricultural UniversityTaian 271018ShandongChina

During secondary growth in trees,xylem cells differentiated from cambium cells begin to synthesize secondary cell walls that are primarily composed of cellulose,hemicellulose and lignin,and are deposited between primary cell walls and plasma membranes,leading to wood *** of regulatory genes functioning during this developmental process is valuable for increasing wood *** this study,we functionally characterized an LBD(LATERAL ORGAN BOUNDARIES DOMAIN)transcription factor PagLBD21 as a repressor of secondary xylem development in *** to wild type plants,transgenic plants overexpressing PagLBD21(PagLBD21OE)exhibited decreased xylem widths in *** with the functional analysis,Rna sequencing(Rna-seq)analysis revealed that genes functioning in xylem development and secondary cell wall biosynthesis pathways were significantly down-regulated in PagLBD21OE *** also performed Dna affinity purification followed by sequencing(DAP-seq)to identify genome-wide target genes of ***,we compared the Rna-seq and DAP-seq datasets of PagLBD21 and PagLBD3,and the results showed that there was a significant overlap between their target genes,suggesting these two LBD transcription factors are functionally redundant during secondary growth.

关键词： LBD walls redundant

Ethylene Evolution Changes in Tilted Fraxinus mandshurica Rupr. var. japonica *** in Relation to Tension Wood Formation

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Journal of Integrative Plant Biology 2009年第7期51卷 707-713页

作者： Sha Jiang Ke xu na Zhao Shu-Xin Zheng Yan-Ping Ren Yu-Bao Gao Song Gu College of Life Sciences Nankai University Tianjin 300071 China

The effects of ethylene on tension wood formation were studied in 3-year-old Fraxinus mandshurica Rupr. var. japonica Maxim. seedlings in two separate experiments. In experiment 1, ethylene evolution of buds and stems was measured using gas chromatography after 0, 2, 4, 7, 14, and 21 d of treatment; in experiment 2, both aminoethoxyvinylglycine （AVG） and AgNO3 were applied to the horizontally-placed stems, and the cell numbers on sites of applications were measured after 40 d. Ethylene evolution from buds was found to be much greater in tilted seedlings than in upright ones. The cell numbers of wood fibers in shoots and 1-year-old stems were reduced in treatments with 12.5×10^-7μmol/L AVG, 12.5×10^-8μmol/L AVG, and 11.8×10^-8μmol/Lmol/L AgNO3; whereas the horizontal and vertical diameters were reduced by treatment of 12.5×10^-7μmol/L AVG. Ethylene evolutions of shoots and 1-year-old stems were inhibited greatly in comparison with the control by applying 12.5×10^-7μmol/L AVG. The formation of a gelatinous layer of wood fibers was affected by neither AVG nor AgNO3 application. These results suggest that ethylene regulates the quantity of wood production, but does not affect G-layer formation in F. mandshurica Rupr. *** Maxim. seedlings.

关键词： ethylene evolution Fraxinus mandshurica inhibitors tension wood formation

A supramolecular bottlebrush polymer assembled on the basis of cucurbit[8]uril-encapsulation-enhanced donor-acceptor interaction

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Chinese Chemical Letters 2017年第6期28卷 1167-1171页

作者： Zhi-Jian Yin Zong-Quan Wu Feng Lin Qiao-Yan Qi Xiao-na xu Xin Zhao Department of Polymer Science and Engineering School of Chemistry and Chemical EngineeringHefei University of Technology Key Laboratory of Synthetic and Self-assembly Chemistry for Organic Functional Molecules Shanghai Institute of Organic ChemistryChinese Academy of Sciences

A supramolecular bottlebrush polymer has been constructed in water through the self-assembly of a rigid electron-deficient building block and an electron-rich monomer which bears two tetraethylene glycol chains,driven by CB[8]-encapsulation-enhanced donor-acceptor *** as-formed supramolecular bottlebrush polymer has been characterized by -1H NMR titration experiment,UV-vis spectroscopy,DLS and 2D -1H NMR DOSY.

关键词： Self-assembly Supramolecular polymer Cucurbituril Donor-acceptor interaction Bottlebrush polymer

Effects of PEAR1 gene polymorphism on big endothelin-1 levels in Chinese patients with acute myocardial infarction after percutaneous coronary intervention

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World Journal of Emergency Medicine 2024年第3期15卷 229-231页

作者： Yi Yao na xu Xiaofang Tang Ce Zhang Sida Jia Jingjing xu Ying Song xueyan Zhao Runlin Gao Jinqing Yuan Center for Coronary Heart Disease National Center for Cardiovascular DiseasesState Key Laboratory of Cardiovascular DiseaseFuwai HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100037China

Acute myocardial infarction (AMI) has been associated with poor prognosis,even after revascularization with percutaneous coronary intervention (PCI),likely due to coronary endothelial cell dysfunction and injury.^([1,2])Endothelin-1 (ET-1),a peptide that serves as a vasoconstrictor of smooth muscle cell proliferation,can reflect endothelial cell functional *** to low circulation levels and short plasma half-life time,measuring plasma ET-1 levels is *** contrast,big ET-1.

关键词： coronary percutaneous endothelin

PID1,a new tumor-promoting gene in insulin resistance mediated acceleration of hepatocellular carcinoma development and progression

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中国药理学与毒理学杂志 2017年第10期31卷 977-978页

作者： Ming XIANG Qian-qian xu na xu Zhong-shi ZHOU Ya-li TUO Cheng TIAN Department of Pharmacology School of PharmacyTongji Medical CollegeHuazhong University of Science and Technology

OBJECTIVE To investigate the effect of phosphotyrosine interaction domain containing 1(PID1,NYGGF4)on promotion of IR and HCC,and explore its underlying *** Lentivirus were used to mediate the knockdown of PID1 in HFD induced IR mouse model as well as ob/ob *** glucose and insulin tolerance were performed 4 weeks after lentivirus ***-based transfection was applied to inducethe liver specific overexpression of *** cytometry was exerted to detect the proportion and function of immune *** T-PCR and Western blot were used to detect the expression of downstream pathways of *** was used to determine the receptor of *** immunoprecipitation(ChI P)was operated to measure the modification of H3K4me3 of PID1 *** PID1 restriction improved insulin resistance,hyperglycemia and fatty ***,hepatic knockdown of PID1 attenuated liver xenografted tumor ***,PID1 liver-specific protooncogenes via hydrodynamics-based transfection established a primary hepatocellular carcinoma mouse model,induced an immunosuppressive environment,with the reduction of CD3^+,CD4^+,CD8^+T cel s,retarded maturation of dendritic cel s(DCs),pronounced differentiation of regulatory T cells(Tregs),and recruitment of *** addition,PID1 overexpression activated proliferation related genes,promoted anti-inflammatory genes,suppressed pro-inflammatory genes,induced glycolysis and lipid metabolism genes to facilitate tumorigenesis in ***,PID1 exerted its tumor-promoting function through binding to epidermal growth factor receptor(EGFR)and activation of downstream MAPK *** such,PID1 exist trimethylation of histone H3 at lysine 4(H3K4me3)modification and IR up-regulated the expression of PID1 by activation the H3K4me3 *** PID1 is a new gene that exerts both liver cancer-promoting and insulin resistance inducing *** accelerates liver cancer

关键词： PID1 insulin resistance hepatocellular carcinoma cancer promoting immunosuppression

Expression and function of CXCR2,CXCR7 of acute leukemic cells in rat

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Asian Pacific Journal of Tropical Medicine 2014年第5期7卷 417-420页

作者： Yuan-Lu Huang Xiao-Li Liu na xu Ya-Juan Xiao Guan-Lun Gao Hematological Department Nanfang HospitalSouthern Medical University

Objective:To investigate the expression and function of chernokine receptor CXCR2 and CXCR7in the rat with acute ***:Flow cytometry and RT-PCR were used to detect the CXCR2,CXCR7 expression on the bone marrow cell surface of the acute leukemia group and the control ***:The bone marrow cell surface CXCR2,CXCR7 relative fluorescence intensity of the observation group was significantly higher than the control group(Pna median expression level of the observation group was higher than the control *** CXCR2 expression and CXCR7expression of the observation group was positively correlated,and the correlation coefficient was0.782(P<0.01).CondiBions:The chernokine receptor CXCR2 and CXCR7 are highly expressed in acute leukemia,which may be associated with the occurrence of leukemia.

关键词： Acute leukemia CXCR2 CXCR7 Flow cytometry RT-PCR