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Microwave Assistant Synthesis and Crystal Structures of Two Substituted Oxazole Isoxazole Carboxamides

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Chinese Journal of Structural Chemistry 2020年第10期39卷 1906-1911,1746页

作者： KANG Tao LIU Cheng-Guo WU Shi-Long GAO Shuang YE Fei FU Ying College of Arts and Sciences Northeast Agricultural UniversityHarbin 150030China instrumental analysis center Northeast Agricultural UniversityHarbin 150030China

Two novel substituted phenyl oxazole isoxazole carboxamides have been synthesized by microwave assistant *** target compounds were characterized by IR,1H NMR,13C NMR and HRMS,and their single-crystal structures were further determined by X-ray diffraction.3-Phenyl-4-(2΄-methyl-2΄-isopropyl-1΄,3΄-oxazole)-5-methyl isoxazole carboxamide(6a)crystallizes in monoclinic system,space group P21/c with a=6.2137(12),b=19.923(4),c=13.748(3)Å,β=92.30(3)°,V=1700.6(6)Å3,Dc=1.228 Mg/m3,Z=4,F(000)=672,μ(MoKα)=0.084 mm-1,R=0.0526 and wR=0.1259.3-(2΄-Fluoro-6΄-chloro-phenyl)-4-(2΄-methyl-2΄-ethyl-1΄,3΄-oxazole)-5-methyl isoxazole carboxamide(6b)crystallizes in triclinic system,space group P with a=7.8750(16),b=10.596(2),c=11.725(12)Å,β=102.05(3)°,V=859.5(3)Å3,Dc=1.363 Mg/m3,Z=2,F(000)=368,μ(MoKα)=0.250 mm-1,R=0.0738 and wR=*** of the molecules prefer to form crystal packing through C–H…O hydrogen *** 6a and 6b show safener activity on maize against the injury of chlorsulfuron.

关键词： oxazole isoxazole carboxamides single-crystal structure synthesis bioactivity

Elucidating the electronic metal-support interaction enhanced hydrogen evolution activity on Ti_(3)C_(2)T_(x)MXene basal plane by scanning electrochemical microscopy

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Nano Research 2023年第7期16卷 8902-8909页

作者： Sisi Jiang Tong Sun Chaoqun Gu Yingfei Ma Zhenyu Wang Dengchao Wang Zonghua Wang College of Chemistry and Chemical Engineering Shandong Sino-Japanese Center for Collaborative Research of Carbon NanomaterialsInstrumental Analysis Center of Qingdao UniversityQingdao UniversityQingdao 266071China School of Chemical Sciences University of Chinese Academy of ScienceBeijing 100190China

MXene,a family of two-dimensional(2D)transition metal carbides and nitrides,has intriguing electrochemical energy storage and electrocatalysis *** the electronic metal-support interaction(EMSI)effect is one effective strategy to optimize the catalytic efficiency for MXene-based ***,most of the studies concentrate on optimizing the performance of metals rather than supported substrates by using this *** this work,we mainly investigate the influence of an EMSI effect on the performance of the supported substrate(Ti_(3)C_(2)T_(x)MXene).Detailed scanning electrochemical microscopy and numerical simulations results reveal that the charge distribution on the Ti_(3)C_(2)T_(x)basal plane(approximate 100 nm-radius)surrounding Au nanoparticles(20 nm-radius)was significantly enhanced as a result of-O being the majority surface functional group on Ti_(3)C_(2)T_(x)that was attached to Au nanoparticle,and the related hydrogen evolution reaction(HER)activity was much better than that of the unaffected Ti_(3)C_(2)T_(x)basal plane,which even can be comparable to that of *** finding will be helpful for designing new strategies to enhance the overall catalytic performance of various MXene-based composites.

关键词： electrocatalysis nanoelectrochemistry MXenes scanning electrochemical microscopy electronic metal-support interaction

GEOCHEMICAL CHARACTERISTICS OF PHOSPHORUS NEAR THE HUANGHE RIVER ESTUARY

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Chinese Journal of Oceanology and Limnology 1999年第4期17卷 359-365,350页

作者：李悦余季金 Department of Environmental Sciences Qingdao University Qingdao China center of instrumental analysis Qingdao University Qingdao China

An improved sequential extraction method was used to extract and determine 7 forms of phosphorus exchangeable or loosely sorbed P (Ads P), aluminum bound P (Al P), iron bound P (Fe P), occluded P (Occ P), authigenic apatite plus biogenic apatite plus CaCO 3- associated P (CFAP P), detrital apatite P (FAP P), and organic bound P (Org P) in suspended matter and surface sediments of the Huanghe River (Yellow River), its estuary and nearby shelf. The concentrations of dissolved inorganic and organic P in river water were also determined. A dissolved P flux of 1.6 billion grams per year, solubilized P flux of 281 billion grams per year, and buried P flux of 588 billion grams per year from the Huanghe River to the Bohai Sea were calculated using the concentrations of P determined in the water column, suspended matter and sediments. Due to the high suspended load and low discharge of the Huanghe River, the direct contribution of dissolved P carried in solution by it to the Bohai Sea is minor compared to the solubilized P released from the suspended matter and sediments. More than two thirds of the total P transported by the Huanghe River is deposited and buried in marine sediments. Decomposition of riverine organic matter which releases organic bound P is an essential source of dissolved/solubilized P in the sea.

关键词： phosphorus form flux Huanghe River estuary

A one-step rectification of sperm cell targeting ensures the success of double fertilization

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Journal of Integrative Plant Biology 2015年第5期57卷 496-503页

作者： Jilei Huang Yan Ju Xiangfeng Wang Quan Zhang Sodmergen Key Laboratory of Cell Proliferation and Differentiation (Ministry of Education) College of Life SciencesPeking University instrumental analysis and Research center South China Agricultural University

Successful fertilization in animals depends on competition among millions of sperm cells, whereas double fertilization in flowering plants usually involves just one pollen tube releasing two immobile sperm cells. It is largely a mystery how the plant sperm cells fuse efficiently with their female targets within an embryo sac. We show that the initial positioning of sperm cells upon discharge from the pollen tube is usually inopportune for gamete fusions and that adjustment of sperm cell targeting occurs through release and re-adhesion of one sperm cell, while the other connected sperm cell remains in stagnation. This enables proper adhesion of each sperm cell to a female gamete and coordinates the gamete fusions. Our 〈br〉 findings reveal inner embryo sac dynamics that ensure the reproductive success of flowering plants and suggest a requirement for sperm cell differentiation as the basis of double fertilization.

关键词： Arabidopsis double fertilization live image sperm celltargeting

Fast Scan mode of scanning electrochemical microscopy:In-situ characterization of phase transition and mapping the hydrogen evolution activity for MoS_(2)

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Nano Research 2023年第7期16卷 10011-10017页

作者： Zhenyu Wang Tong Sun Changan HuangFu Sisi Jiang Chaoqun Gu Liying Jiao Zonghua Wang College of Chemistry and Chemical Engineering College of Materials Science and EngineeringShandong Sino-Japanese Center for Collaborative Research of Carbon NanomaterialsInstrumental Analysis Center of Qingdao UniversityQingdao UniversityQingdao 266071China Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China

Scanning electrochemical microscopy(SECM)is an attractive technology to in-situ characterize the structural evolution and catalytic performance for various ***,spatial and temporal resolution coupling are still the obstacles that limit its wide ***,a new operation mode,Fast Scan mode,was developed by improving the dual-pass scan mode,designing novel hardware structure,and employing thermal drift calibration software to achieve a high spatial and temporal resolution *** temporal speed can achieve 4 Hz for a high spatial resolution(less than 30 nm)*** operation mode was employed to dynamically track the phase transition process of molybdenum disulfide(MoS_(2))over time and characterize the hydrogen evolution reaction(HER)catalytic activity on the edge of semiconducting MoS_(2)quantitatively while minimizing the diffusional broadening effect and total amount of catalytic products generated above the *** new approach should be useful for in-situ tracking dynamic electrochemical processes,establishing the structure-activity relationship for structural complex electrocatalysts,and offering a strategy for high-speed scanning with other electrochemical imaging techniques.

关键词： high-speed scanning scanning electrochemical microscopy molybdenum disulfide phase transition hydrogen evolution reaction

The First Two-dimensional Supramolecular Network Constructed by Na(Ⅰ) with 2-Methylimidazole-4,5-dicarboxylate Building Blocks

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Chinese Journal of Structural Chemistry 2011年第12期30卷 1770-1774页

作者：涂勇刚熊志强宋秀英聂旭亮温世和刘光斌 College of Food Science and Engineering Jiangxi Agricultural University instrumental analysis center Nanchang Hangkong University College of Science Jiangxi Agricultural University

The title complex [Na（H2MIA-）（H2O）]（1,H3MIA = 2-methyl-1H-imidazole-4,5-dicarboxylic acid） has been synthesized by hydrothermal synthesis and structurally characterized by X-ray *** 1 crystallizes in orthorhombic,space group ibam with a = 14.4737（19）,b = 17.553（2）,c = 6.5285（9）,V = 1658.6（4） 3,C6H7N2NaO5,Mr = 210.12,Z = 8,Dc = 1.675 g/cm3,F（000） = 864,μ = 0.188 mm-1,λ（MoKα） = 0.071073 ,R = 0.0383 and wR = 0.0987 for 1046 observed reflections（I 2σ（I））.In the structure of 1,each coordination water coordinates with two Na（I） ions at the same time and links the neighboring Na（I） ions to form a one-dimensional Na（I）-water *** H2MIA-ligand links the neighboring Na（I） of Na（I）-water chain to form a novel two-dimensional supramolecular *** 2-D network is stabilized by O-H…N hydrogen bonds and π-π *** 2D network is further linked via O-H…O hydrogen bonds to yield a three-dimensional framework.

关键词： Na 2-methyl-1H-imidazole-4 5-dicarboxylic acid hydrothermal synthesis crystal structure

Transcriptome-wide N6-methyladenosine(m^(6)A)methylation in soybean under Meloidogyne incognita infection

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aBIOTECH 2022年第3期3卷 197-211页

作者： Xue Han Qianqian Shi Ziyi He Wenwen Song Qingshan Chen Zhaoming Qi College of Agriculture Northeast Agricultural UniversityHarbin150030China Shandong Engineering Research center for Environment-Friendly agricultural Pest Management College of Plant Health and MedicineQingdao Agricultural UniversityQingdao266109China

N^(6)-methyladenosine(m^(6)A)is a reversible epigenetic modification of mRNA and other RNAs that plays a significant role in regulating gene expression and biological ***,m^(6)A abundance,dynamics,and transcriptional regulatory mechanisms remain unexplored in the context of soybean resistance to Meloidogyne *** this study,we performed a comparative analysis of transcriptome-wide m^(6)A and metabolome profiles of soybean root tissues with and without *** *** m^(6)A hypermethylation was widely induced in response to *** infection and was enriched around the 3′end of coding sequences and in 3′UTR *** were 2069 significantly modified m^(6)A sites,594 differentially expressed genes,and 103 differentially accumulated metabolites between infected and uninfected roots,including coumestrol,psoralidin,and *** 101 m^(6)A-modified DEGs,34 genes were hypomethylated and upregulated,and 39 genes were hypermethylated and downregulated,indicating a highly negative correlation between m^(6)A methylation and gene transcript abundance.A number of these m^(6)A-modified DEGs,including WRKY70,ERF60,POD47 and LRR receptor-like serine/threonine-protein kinases,were involved in plant defense *** study provides new insights into the critical role of m^(6)A modification in early soybean responses to ***.

关键词： m^(6)A methylation Soybean Meloidogyne incognita m^(6)A-seq RNA-seq Metabolome

Plasmonic polydopamine-modified TiO_(2)nanotube substrates for surface-assisted laser desorption/ionization mass spectrometry imaging

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Nano Research 2023年第2期16卷 3028-3039页

作者： Dong Chen Mingyi Du Yudi Huang Yizhu Xu Yingying Chen Lianlian Ma Qingrong Xie Xinhai Zhu Zilong Chen Hanhong Xu Xinzhou Wu Zhibin Yin State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources and Key Laboratory of Natural Pesticide and Chemical Biology of the Ministry of Education South China Agricultural UniversityGuangzhou 510642China Agro-biological Gene Research center Guangdong Academy of Agricultural SciencesGuangzhou 510640China instrumental analysis and Research center Sun Yat-sen UniversityGuangzhou 510275China

Mass spectrometry imaging(MSI)has made the spatio-chemical characterization of a broad range of small-molecule metabolites within biological tissues ***,available matrix-assisted laser desorption/ionization mass spectrometry(MALDI-MS)suffers from severe background interferences in low-mass ranges and inhomogeneous matrix ***,surface-assisted LDI-MS(SALDI-MS)has been an attractive alternative for high-sensitivity detection and imaging of small *** this study,we construct a new composite substrate,hydrophobic polydopamine(hPDA)-modified TiO_(2)nanotube(TDNT)coated with plasmonic gold nanoparticle(AuNP-hPDA-TDNT),as a dual-polarity SALDI substrate using an easy and cost-effective fabrication *** from the synergistic effects of TDNT semiconductor and plasmonic PDA modification,this SALDI substrate exhibits superior performance for dual-polarity detection of a vast diversity of small *** reduced background interferences,lower detection limits,and spot-to-spot repeatability can be achieved using AuNP-hPDA-TDNT *** to its unique imprinting performance,various metabolites and lipids can be visualized within jatropha integerrima petals,ginkgo leaves,strawberry fruits,and latent *** valuably,the universality of this matrix-free substrate is demonstrated for mapping spatial distribution of lipids within mouse brain tissue *** together,this AuNP-hPDA-TDNT material is expected to be a promising SALDI substrate in various fields,especially in nanomaterial development and life sciences.

关键词： TiO_(2)nanotube surface-assisted laser desorption/ionization(SALDI) mass spectrometry imaging latent fingerprint tissue imaging

Cytological and Proteomic analysis of Ginkgo biloba Pollen Intine

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Horticultural Plant Journal 2020年第4期6卷 257-266页

作者： Weixing Li Yunling Ye Fangmei Cheng Yan Lu Biao Jin Li Wang College of Horticulture and Plant Protection Yangzhou UniversityYangzhou 225009China Suqian Academy of Protected Horticulture Nanjing Agricultural UniversitySuqianJiangsu 223800China instrumental analysis center Yangzhou UniversityYangzhou 225009China

The pollen intine plays important roles in pollen germination and tube growth,but related information in Ginkgo biloba remains *** isolated and obtained de-exined pollen from *** fluorescent probes,we observed the strongest cellulose fluorescence in the pollen ***-esterified pectin immunolabeled with JIM5 was present throughout the entire cell wall,whereas esterified pectin recognized by the monoclonal antibody JIM7 was concentrated in some *** staining with aniline blue was observed across the entire surface of the pollen *** results were confirmed by Fourier Transform InfraRed(FTIR)*** also used proteomic approaches to identify different proteins between mature and de-exined pollen(48h after hydration)in *** on mass spectrometry,de-exined pollen had more proteins than mature pollen,including calmodulin,serine hydroxymethyltransferase,β-galactosidase 6,and class IV *** to Gene Ontology(GO)analysis,the differentially expressed proteins were mainly associated with transportation,defense reaction,sugar metabolism,energy metabolism,signal transduction,and cell wall *** findings suggest that most proteins involved in pollen germination and pollen tube growth are synthesized during pollen hydration,indicating the important role of pollen hydration in the reproductive process of ***.

关键词： Ginkgo biloba pollen intine cytological analysis proteomics mass spectrometry