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Synthesis of aza-naphthindolizinedione derivatives

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Chinese Chemical Letters 2008年第5期19卷 533-536页

作者： De Qing Shen Yu Cheng lin kun An Xian zhang Bu School of Pharmaceutical Sciences Sun Yat-sen University Guangzhou 510080 China

A series of aza-naphthindolizinedione derivatives, such as indolizinoquinolinedione derivatives, indolizinophthalazinedione derivatives and indolizinoquinoxalinedione derivatives were designed and synthesized. The syn... 详细信息

关键词： Synthesis Indolizinoquinolinedione Indolizinophthalazinedione Indolizinoquinoxalinedione

Synthesis of new 2-aryl-6-styryl-2,3-dihydropyridin-4(1H)-one derivatives from curcuminoids

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Chinese Chemical Letters 2009年第11期20卷 1291-1295页

作者： Ying Peng Huo Xu Qiu Wei Yan Shao lin kun An Xian zhang Bu Lian Quan Gu School of Pharmaceutical Sciences Sun Yat-Sen University Guangzhou 51006 China

Series of new 2-aryl-6-styry1-2,3-dihydropyridin-4（1H）-one derivatives were synthesized in acceptable to good yields by treatment of the curcuminoids with aqueous ammonia, the mechanism was proposed. By modification of the primary products, total 13 new compounds were obtained. The structures of all products were elucidated by spectroscopy analysis including HR-MS, 1H NMR and ^13C NMR.

关键词： Dihydropyridinone Curcumin Aqueous ammonia

Roles of serum uric acid on the association between arsenic exposure and incident metabolic syndrome in an older Chinese population

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Journal of Environmental Sciences 2025年第1期147卷 332-341页

作者： Haiyan Jiang Simei zhang Yaoyao lin lin Meng Jiayi Li Wenqing Wang Kaixuan Yang Mingjuan Jin Jianbing Wang Mengling Tang kun Chen Department of Public Health Fourth Affiliated HospitalZhejiang University School of MedicineHangzhou 310058China Department of Public Health Second Affiliated HospitalZhejiang University School of MedicineHangzhou 310058China Department of Public Health National Clinical Research Center for Child Health of Children’s HospitalZhejiang University School of MedicineHangzhou 310058China

Growing evidences showed that heavy metals exposure may be associated with metabolic ***,themechanism underlying arsenic(As)exposure and metabolic syndrome(MetS)risk has not been fully *** we aimed to prospectively investigate the role of serum uric acid(SUA)on the association between blood As exposure and incident MetS.A sample of 1045 older participants in a community in China was *** determined As at baseline and SUA concentration at follow-up in the Yiwu Elderly *** events were defined according to the criteria of the International Diabetes Federation(IDF).Generalized linear model with log-binominal regression model was applied to estimate the association of As with incident *** investigate the role of SUA in the association between As andMetS,amediation analysiswas *** the fully adjusted log-binominal model,per interquartile range increment of As,the risk of MetS increased *** with the lowest quartile of As,the adjusted relative risk(RR)of MetS in the highest quartile was 1.42(95%confidence interval,CI:1.03,2.00).Additionally,blood As was positively associated with SUA,while SUA had significant association with MetS *** mediation analysis demonstrated that the association of As and MetS risk was mediated by SUA,with the proportion of 15.7%.Our study found higher As was remarkably associated with the elevated risk of MetS in the Chinese older adults *** analysis indicated that SUA might be a mediator in the association between As exposure and MetS.

关键词： Arsenic(As)exposure Metabolic syndrome(MetS) Serum uric acid(SUA) Cohort study Mediation effect Older adults

A comparative study on the formation of nitrogen-containing organic compounds in cloud droplets and aerosol particles

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Journal of Environmental Sciences 2025年第3期149卷 456-464页

作者： Guohua zhang TaoWang Qinhao lin kun Liu Wei Sun Duohong Chen Lei Li Xinming Wang Xinhui Bi State Key Laboratory of Organic Geochemistry and Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization Guangzhou Institute of GeochemistryChinese Academy of Sciences(CAS)Guangzhou 510640China Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control Guangzhou Institute of GeochemistryCASGuangzhou 510640China University of Chinese Academy of Sciences Beijing 100049China School of Environmental Science and Engineering Institute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China State Environmental Protection Key Laboratory of Regional Air Quality Monitoring Guangdong Environmental Monitoring CenterGuangzhou 510308China Institute of Mass Spectrometer and Atmospheric Environment Jinan UniversityGuangzhou 510632China

Nitrogen-containing organic compounds(NOCs)may potentially contribute to aqueous secondary organic aerosols,yet the different formation of NOCs in aerosol particles and cloud droplets remains *** the in-situ measurements performed at a mountain site(1690 m a.s.l.)in southern China,we investigated the formation of NOCs in the cloud droplets and the cloud-free particles,based on their mixing state information of NOCscontaining particles by single particle mass *** relative abundance of NOCs in the cloud-free particles was significantly higher than those in cloud residual(cloud RES)*** were highly correlated with carbonyl compounds(including glyoxalate and methylglyoxal)in the cloud-free particles,however,limited correlation was observed for cloud RES *** of their mixing state and temporal variations highlights that NOCs was mainly formed from the carbonyl compounds and ammonium in the cloud-free particles,rather than in the cloud RES *** results support that the formation of NOCs from carbonyl compounds is facilitated in concentrated solutions in wet aerosols,rather than cloud *** addition,we have identified the transport of biomass burning particles that facilitate the formation of NOCs,and that the observed NOCs is most likely contributed to the light *** findings have implications for the evaluation of NOCs formation and their contribution to light absorption.

关键词： Nitrogen-containing organic compounds Individual particles Cloud Carbonyl compounds Mixing state

Rosaceae phylogenomic studies provide insights into the evolution of new genes

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Horticultural Plant Journal 2025年第1期11卷 389-405页

作者： Lan Jiang Xiaoxu Li kun Lyu Han Wang Zhiyuan Li Wang Qi lin zhang Yunpeng Cao Anhui Province Key Laboratory of Non-coding RNA Basic and Clinical Transformation(Wannan Medical College) Central LaboratoryYijishan Hospital of Wannan Medical CollegeWuhuAnhui 241000China Beijing Life Science Academy Beijing 102209China CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture Wuhan Botanical GardenChinese Academy of SciencesWuhanHubei 430074China Center of Economic Botany Core Botanical GardensChinese Academy of SciencesWuhanHubei 430074China Key Laboratory for Tobacco Gene Resources Tobacco Research InstituteChinese Academy of Agricultural SciencesQingdaoShangdong 266000China school of Life Sciences Anhui Agricultural UniversityHefeiAnhui 230036China School of Basic Medical Sciences Hubei University of Chinese MedicineWuhanHubei 430065China

Rosa banksiae,known as Lady Banks'rose,is a perennial ornamental crop and a versatile herb in traditional Chinese *** the lack of genomic resources,we assembled a Hi Fi and Nanopore sequencing-derived 458.58 Mb gap-free telomere-to-telomere high-quality *** genome with a scaffold N50=63.90 *** genome of *** exhibited no lineage-specific whole-genome duplication compared with other *** phylogenomic analysis of 13 Rosaceae and Arabidopsis through a comparative genomics study showed that numerous gene families were lineage-specific both before and after the diversification of *** of these genes are candidates for new genes that have evolved from parental genes through fusion *** genes are divided into three types:Type-I and Type-II genes contain two parental genes that are generated by duplication,distributed in the same and different regions of the genome,respectively;and Type-III can only be detected in one parental ***,Type-I genes are found to have more relaxed selection pressure and lower Ks values than Type-II,indicating that these newly evolved Type-I genes may play important roles in driving phenotypic *** analysis exhibited that newly formed fusion genes can regulate the phenotype traits of plant growth and development,suggesting the functional significance of these *** study identifies new fusion genes that could be responsible for phenotype evolution and provides information on the evolutionary history of recently diverged species in the Rosa *** data represents the major progress in understanding the new fusion genes evolution pattern of Rosaceae and provides an invaluable resource for phylogenomic studies in plants.

关键词： Rosa banksiae Gap-free genome Rosaceae Phenotype Evolutionary patterns

Numerical Study of Flow and Heat Transfer Characteristics of Shell-and-Tube Molten Salt Electric Heater with Circularly Perforated Baffles

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Journal of Thermal Science 2025年第1期34卷 24-33页

作者： lin Yongjie zhang Cancan WU Yuting zhang Yi LU Yuanwei Key Laboratory of Heat Transfer and Energy Conversion National User-Side Energy Storage Innovation Research and Development CenterBeijing University of TechnologyBeijing 100124China

Numerical simulations of the flow and heat transfer characteristics of four shell-and-tube molten salt electric heaters with different perforation rates was ***-and-tube electric heaters have the same geometry and tube arrangement,and all of them use single segmental baffles,but there exist four different baffle openings(φ),i.e.,0%,2.52%,4.06%,and 6.31%.The results indicated that the reasonable baffle opening could significantly reduce the shell-side pressure drop,effectively decreasing the shell-side flow dead zone *** can eliminate the local high-temperature phenomenon on the surface of electric heating tubes,but the heat transfer coefficient is slightly *** perforated schemes significantly reduce shell-side pressure drop compared to the baseline solution without open *** particular,the φ=6.31% scheme exhibits the optimal performance among all the schemes,with a maximum reduction of up to 50.50% in shell-side pressure drop relative to the unopened holes *** heat transfer coefficient is the highest for φ=0%,exhibiting a range of5.26% to 5.73%,5.14% to 5.99%,and 7.31% to 8.54% higher than φ=2.52%,4.06%,and 6.31%,respectively,within the calculated *** composite index h/(Δp)^(1/3)was higher for all open-hole solutions than that for the unopened-hole *** best overall performance was for φ=6.31%,which improved the composite index by15.29%to 17.18%over the unopened-hole solution.

关键词： molten salt electric heater perforated baffles heat transfer

Aerodynamic Optimization and Flow Mechanism for a Compressor Cascade at Low Reynolds Number

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Journal of Thermal Science 2025年第1期34卷 92-109页

作者： LI lin zhang Jianshe CHEN Caiyan TAN Wei zhang Yanfeng Key Laboratory of Light-Duty Gas-Turbine Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China National Key Laboratory of Science and Technology on Advanced Light-duty Gas-turbine Beijing 100190China

Low-Reynolds-number effect is an important factor affecting the performance of compressors and other main components of high-altitude long-endurance unmanned aerial *** improve the flow condition and reduce flow loss under the condition of high altitude and low Reynolds number(Re),this paper proposes an optimization process based on a surrogate model,which combines the class-shape transformation method(CST),the Latin hypercube sampling(LHS)method,the light gradient-boosting machine algorithm(LightGBM),and a genetic algorithm(GA)to optimize a high-subsonic compressor *** surrogate model is verified to be accurate and can be used in the optimization *** accuracy of the GA is higher than the other algorithms under common test *** optimization results are verified by numerical simulation,and the flow differences before and after optimization are compared,especially the flow within the boundary *** changing the blade shape,the optimization process adjusts the loading distribution to delay the transition of the optimized blade on the suction surface,which changes the turbulent reattachment in the laminar separation bubble(LSB)into laminar ***,the mixing loss induced by the turbulent reattachment of the LSB and the wake loss of turbulent separation at the trailing edge are significantly reduced,and the performance of the compressor profile is finally *** addition,turbulent separation of the optimized profile is delayed reducing the range of the wake region on the suction *** this optimization process,the reduction of total pressure loss coefficient at Re of 2.5×10^(5),3.5×10^(5),and 4.5×10^(5) are 16.32%,20.76%,and 22.16%,respectively.

关键词： low Reynolds numbers compressor optimization boundary layer transition

The role of vascular endothelial growth factor in ossification

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International Journal of Oral Science 2012年第2期4卷 64-68页

作者： Yan-Qi Yang Ying-Ying Tan Ricky Wong Alex Wenden lin-kun zhang A bakr M Rabie Department of Orthodontics Faculty of Dentistry The University of Hong Kong Hong Kong China Unit Pakar Ortodontik Klinik Pergigian Poliklinik Komuniti Mak MandinMalaysia Department0fOrfhodonflcs Tlanj}nsfomafoI.gicalH.spJcaJ.iNankaiunIversityTianjinchinaand PrivatePracticeC0rrespondence:DrYQYang DepartmentDfOrthodonticsFacultyofDentIstryTheUnlversity硝HongKong34HospnalRoadHOngK0ngSARChinaE—maiJ=yan副anq@hkuhk

Osteogenesis and angiogenesis are two closely correlated processes during bone growth, development, remodelling and repair. Vascular endothelial growth factor （VEGF） is an essential mediator during the process of angiogenesis. Based on an extensive literature search, which was carried out using the PubMed database and the keywords of osteogenesis, VEGF, endochondral ossification and intramembranous ossification, this manuscript reviews the role of VEGF in ossification, with emphasis on its effect in endochondral and intramembranous ossification. Osteogenesis and angiogenesis are closely correlated processes. VEGF acts as an essential mediator durin~ these processes. It not only functions in bone an^io^enesis but also in various aspects of bone develooment.

关键词： endochondral ossification intramembranous ossification osteogenesis vascular endothelial growth factor

The Influence of Heterogeneous Processes on the Physicochemical Properties of Atmospheric Aerosols

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Advances in Atmospheric Sciences 2025年第4期42卷 623-640页

作者： Maofa GE Shengrui TONG lin DU lingyan WU Ting LEI kun LI Minglan XU Narcisse T.TSONA Wenqian zhang Hailiang zhang State Key Laboratory for Structural Chemistry of Unstable and Stable Species Beijing National Laboratory for Molecular Sciences(BNLMS)Institute of ChemistryChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing 100049China Environment Research Institute Shandong UniversityQingdao 266237China State Key Laboratory of Severe Weather&Key Laboratory of Atmospheric Chemistry of CMA Chinese Academy of Meteorological SciencesBeijing 100081China

With the rapid development of the world economy,complex air pollution has increasingly become a serious threat;for example,with haze events occurring frequently in various regions of the *** evidence has indicated that secondary aerosols play an important role in haze formation,and that heterogeneous processes are among the main forces driving their explosive *** this regard,this paper reviews recent advances in the understanding of the impact of heterogeneous processes on haze chemistry,including the impact on NO_(2)chemistry,marine aerosols,and the hygroscopicity and optical properties of atmospheric *** is distinguished from past reviews on this topic by focusing mainly on new insights from the past five *** summarize the main findings of the impacts of heterogeneous processes on NO_(2)chemistry,marine aerosols,and the physicochemical properties of atmospheric aerosols,and propose several future research directions.

关键词： heterogeneous chemistry atmosphere aerosols physicochemical properties