检索结果-南通市图书馆

Chinese Chemical Letters 2017年第7期28卷 1553-1558页

作者： Guang Huang hui-ran zhao Qing-Qing Meng Wen Zhou Qi-Jing Zhang Jin-Yun Dong Jia-Hua Cui Shao-Shun Li School of Pharmacy Shanghai Jiao Tong UniversityShanghai 200240China Shanghai Institute of Pharmaceutical Industry Shanghai 201203China School of Pharmaceutical Sciences and Chemistry Dali UniversityDali 671000China

6-Substituted 5,8-O-dimethyl-1,4-naphthoquinones（6-DMNQ）,the promising anticancer scaffolds,were selectively generated by oxidative demethylation of 2-substituted 1,4,5,8-tetramethoxynaphthalenes with CAN in EtOAc/H2O in comparatively high *** interesting finding was that apart from the reported electron-withdrawing effects of substituents on position 2 of naphthalene ring,regioselective synthesis of 6-DMNQ was largely dependent on the steric effects in CAN-mediated *** selective cytotoxicities of 6-DMNQ from the in vitro cell-based assays were exhibited between the cancer cells and normal ***,most of sulfur-containing 6-DMNQ derivatives displayed better anticancer activities than the corresponding oxygen-containing ones,which could provide an available strategy for the design of 6-DMNQ derivatives as potential anticancer agents.

关键词： 6-Substituted 5 8-O-dimethyl-1 4- naphthoquinone Cerium(Ⅳ) ammonium nitrate Regioselective oxidation Steric effects Antitumor activity Sulfur-containing

Salsolinol as an RNA m~6A methylation inducer mediates dopaminergic neuronal death by regulating YAP1 and autophagy

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第3期20卷 887-899页

作者： Jianan Wang Yuanyuan ran Zihan Li Tianyuan zhao Fangfang Zhang Juan Wang Zongjian Liu Xuechai Chen Beijing International Science and Technology Cooperation Base for Antiviral Drugs College of Chemistry and LifeBeijing University of TechnologyBeijingChina Department of Rehabilitation Beijing Rehabilitation HospitalCapital Medical UniversityBeijingChina

Salsolinol(1-methyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline,Sal)is a catechol isoquinoline that causes neurotoxicity and shares structural similarity with 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine,an environmental toxin that causes Parkinson's ***,the mechanism by which Sal mediates dopaminergic neuronal death remains *** this study,we found that Sal significantly enhanced the global level of N~6-methyladenosine(m~6A)RNA methylation in PC12 cells,mainly by inducing the downregulation of the expression of m~6A demethylases fat mass and obesity-associated protein(FTO)and alk B homolog 5(ALKBH5).RNA sequencing analysis showed that Sal downregulated the Hippo signaling *** m~6A reader YTH domain-containing family protein 2(YTHDF2)promoted the degradation of m~6A-containing Yes-associated protein 1(YAP1)mRNA,which is a downstream key effector in the Hippo signaling ***,downregulation of YAP1 promoted autophagy,indicating that the mutual regulation between YAP1 and autophagy can lead to *** findings reveal the role of Sal on m~6A RNA methylation and suggest that Sal may act as an RNA methylation inducer mediating dopaminergic neuronal death through YAP1 and *** results provide greater insights into the neurotoxic effects of catechol isoquinolines compared with other studies and may be a reference for assessing the involvement of RNA methylation in the pathogenesis of Parkinson's disease.

关键词： ALKBH5 autophagy FTO Hippo pathway m~6A Parkinson's disease RNA methylation salsolinol YAP1 YTHDF2

Unraveling the significance of cobalt on transformation kinetics,crystallography and impact toughness in high-strength steels

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 380-390页

作者： Yishuang Yu Jingxiao zhao Xuelin Wang hui Guo Zhenjia Xie Chengjia Shang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

This work reveals the significant effects of cobalt(Co)on the microstructure and impact toughness of as-quenched highstrength steels by experimental characterizations and thermo-kinetic *** results show that the Co-bearing steel exhibits finer blocks and a lower ductile-brittle transition temperature than the steel without ***,the Co-bearing steel reveals higher transformation rates at the intermediate stage with bainite volume fraction ranging from around 0.1 to *** improved impact toughness of the Co-bearing steel results from the higher dense block boundaries dominated by the V1/V2 variant ***,the addition of Co induces a larger transformation driving force and a lower bainite start temperature(BS),thereby contributing to the refinement of blocks and the increase of the V1/V2 variant *** findings would be instructive for the composition,microstructure design,and property optimization of high-strength steels.

关键词： high-strength steel cobalt transformation kinetics crystallography impact toughness

Distributed fiber optic sensing system for vibration monitoring of 3D printed bridges

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2025年第1期21卷 28-34页

作者： zhao Shuai ZHOU ran LUO Mingming LIU Jianfei LIU Xiongfei ZHOU Tao School of Electronic Information Engineering Hebei University of Technology Tianjin Key Laboratory of Electronic Materials and Devices School of Civil Engineering and Transportation Hebei University of Technology Tianjin Jinhang Institute of Technical Physics

The fiber optic sensing technology provides data support in structural health monitoring of the macro facilities, including design, construction, and maintenance of bridges, tunnels, ports and other infrastructures. In this paper, a distributed vibration sensing system is proved to be responsive to a single touch over a 1.8-m-long equivalent fiber segment, covering a vibration frequency from 5 Hz to 25 kHz. The sensing fiber was arranged as an S type layout on the bridge to recognize the standing state, windblown disturbance, and walking vibration. Moreover, the knocking and climbing events are recognized fiber laying spinning lines and hanging on the fences, respectively. The demonstration shows an accurate positioning and sensitive vibration monitoring applied on the automated three-dimensional(3D) printed bridge, which is applicable to all kinds of 3D printed facilities as intelligent sensory neuro-networks.

关键词： Spinning (fibers)

The cGAS-STING-interferon regulatory factor 7 pathway regulates neuroinflammation in Parkinson's disease

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第8期20卷 2361-2372页

作者： Shengyang Zhou Ting Li Wei Zhang Jian Wu hui Hong Wei Quan Xinyu Qiao Chun Cui Chenmeng Qiao Weijiang zhao Yanqin Shen Laboratory of Neurodegenerative and Neuroinjury Diseases Wuxi Medicine SchoolJiangnan UniversityWuxiJiangsu ProvinceChina

Interferon regulatory factor 7 plays a crucial role in the innate immune ***,whether interferon regulatory factor 7-mediated signaling contributes to Parkinson's disease remains *** we report that interferon regulatory factor 7 is markedly up-regulated in a 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine-induced mouse model of Parkinson's disease and co-localizes with microglial *** the selective cyclic guanosine monophosphate adenosine monophosphate synthase inhibitor RU.521 and the stimulator of interferon genes inhibitor H151 effectively suppressed interferon regulatory factor 7 activation in BV2 microglia exposed to 1-methyl-4-phenylpyridinium and inhibited transformation of mouse BV2 microglia into the neurotoxic M1 *** addition,si RNA-mediated knockdown of interferon regulatory factor 7 expression in BV2 microglia reduced the expression of inducible nitric oxide synthase,tumor necrosis factorα,CD16,CD32,and CD86 and increased the expression of the anti-inflammatory markers ARG1 and *** together,our findings indicate that the cyclic guanosine monophosphate adenosine monophosphate synthase-stimulator of interferon genes-interferon regulatory factor 7 pathway plays a crucial role in the pathogenesis of Parkinson's disease.

关键词： cyclic guanosine monophosphate adenosine monophosphate synthase H151 interferon regulatory factor 7 M1 phenotype neurodegenerative disease neuroinflammation Parkinson’s disease RU521 STING type I interferon

在线全文

学校读者我要写书评

暂无评论

咔唑席夫碱衍生物的制备与表征

淮阴师范学院学报（自然科学版） 2017年第2期16卷 135-141页

作者：周义丰张宗辉刘佳然赵剑英淮阴师范学院化学化工学院江苏淮安223300

以咔唑为母体,合成了(E)-4-(N-乙基咔唑-3-甲亚胺基)-安替比林希夫碱(R1)和2-氨基-3-(E)-(N-对苯甲基咔唑基-甲亚胺基)-马来腈席夫碱(R2).利用CCD、~1HNMR、MS、HFT-IR等对产物进行了表征.X-射线单晶衍射表明:R1晶体属单斜晶系,P2(1)/n... 详细信息

以咔唑为母体,合成了(E)-4-(N-乙基咔唑-3-甲亚胺基)-安替比林希夫碱(R1)和2-氨基-3-(E)-(N-对苯甲基咔唑基-甲亚胺基)-马来腈席夫碱(R2).利用CCD、~1HNMR、MS、HFT-IR等对产物进行了表征.X-射线单晶衍射表明:R1晶体属单斜晶系,P2(1)/n空间群,晶胞参数a=10.538(3),b=18.350(6),c=11.122(3);α=90°,β=97.067(7)°,γ=90°,Z=4.R2晶体属三斜晶系,空间群P-1(2),a=91.542(3),b=92.884(2),c=113.576(2);α=11.367(2)°,β=11.367(2)°,γ=13.754(3)°,Z=4.R1和R2最大吸收波长分别为λ_(max)=396.1 nm和λ_(max)=351.1 nm.R1吸收荧光发射波长(甲醇溶液)为458.7 cm.

关键词：咔唑希夫碱衍生物合成表征

Better nutrition, healthier mind? Experimental evidence from primary schools in rural northwestern China

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2019年第8期18卷 1768-1779页

作者： LIU Xiao-yue zhao Qi-ran CHEN Qi-hui Center for Food and Health Economic Research College of Economics and Management China Agricultural University

Malnutrition and mental health problems are both prevalent among rural students in China. To provide a better understanding of the functional linkage between these two problems, this study estimates the causal effect of improved nutrition on rural students’ mental health status, exploiting a randomized controlled trial involving 6 044 fourth and fifth graders in rural northwestern China. Estimation results show that a nutrition subsidy provided by the project significantly improved students’ mental health status(measured by their anxiety scale). However, an add-on incentive provided to school principals, which was tied to anemia reduction, almost entirely offset the beneficial impact of the nutrition subsidy. These findings suggest that to improve students’ mental health in rural China, not only direct subsidies, such as low-priced school meals, but also correct incentives, especially those tied closely to students’ mental health outcomes, should be provided.

关键词： malnutrition mental health randomized controlled trial rural China

Comparison of Two MicroRNA Quantification Methods for Assaying MicroRNA Expression Profiles in Wheat(Triticum aestivum L.)

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2014年第4期13卷 733-740页

作者： HAN ran YAN Yan ZHOU Peng zhao hui-xian State Key Laboratory of Crop Stress Biology for Arid Areas/College of Life Sciences Northwest A&F University

Two microRNA （miRNA） quantification methods, namely, poly（A） reverse transcription （RT）-quantitative real-time polymerase chain reaction （qPCR） and stem-loop RT-qPCR, have been developed for quantifying miRNA expression. In the present study, five miRNAs, including miR166, miR167, miR168, miR159, and miR396, with different sequence frequencies, were selected as targets to compare their expression profiles in five wheat tissues by applying the two methods and deep sequencing. The study aimed to determine a simple, reliable and high-throughput method for detecting miRNA expressions in wheat tissues. Results showed that the miRNA expression profiles determined by poly（A） RT-qPCR were more consistent with those obtained by deep sequencing. Further analysis indicated that the correlation coefficients of the data obtained by poly（A） RT-qPCR and deep sequencing （0.739, P≤0.01） were higher than those obtained by stem-loop RT-qPCR and deep sequencing （0.535, P≤0.01）. The protocol used for poly（A） RT-qPCR is simpler than that for stem-loop RT-qPCR. Thus, poly（A） RT-qPCR was a more suitable high-throughput assay for detecting miRNA expression profiles. To the best of our knowledge, this study was the first to compare these two miRNA quantification methods. We also provided useful information for quantifying miRNA in wheat or other plant species.

关键词： Triticum aestivum L. microRNA deep sequencing poly(A) RT-qPCR stem-loop RT-qPCR

Understanding the local structure and thermophysical behavior of Mg-La liquid alloys via machine learning potential

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 439-449页

作者： Jia zhao Taixi Feng Guimin Lu National Engineering Research Center for Integrated Utilization of Salt Lake Resource East China University of Science and TechnologyShanghai 200237China Joint International Laboratory for Potassium and Lithium Strategic Resources East China University of Science and TechnologyShanghai 200237China

The local structure and thermophysical behavior of Mg-La liquid alloys were in-depth understood using deep potential molecular dynamic(DPMD) simulation driven via machine learning to promote the development of Mg-La alloys. The robustness of the trained deep potential(DP) model was thoroughly evaluated through several aspects, including root-mean-square errors(RMSEs), energy and force data, and structural information comparison results;the results indicate the carefully trained DP model is reliable. The component and temperature dependence of the local structure in the Mg-La liquid alloy was analyzed. The effect of Mg content in the system on the first coordination shell of the atomic pairs is the same as that of temperature. The pre-peak demonstrated in the structure factor indicates the presence of a medium-range ordered structure in the Mg-La liquid alloy, which is particularly pronounced in the 80at% Mg system and disappears at elevated temperatures. The density, self-diffusion coefficient, and shear viscosity for the Mg-La liquid alloy were predicted via DPMD simulation, the evolution patterns with Mg content and temperature were subsequently discussed, and a database was established accordingly. Finally, the mixing enthalpy and elemental activity of the Mg-La liquid alloy at 1200 K were reliably evaluated,which provides new guidance for related studies.

关键词： magnesium-lanthanum liquid alloys local structure macroscopic properties thermodynamic behavior deep potential mo-lecular dynamic simulation

自动乳腺全容积成像和磁共振成像、钼靶影像学特征在三阴性乳腺癌的诊断及预后分析的价值

在线全文

学校读者我要写书评

暂无评论

临床放射学杂志 2025年第1期44卷 69-75页

作者：张琪茹赵辉韩华河南省新乡市中心医院超声科二 453000

目的探讨自动乳腺全容积成像(ABVS)和MRI、钼靶影像学特征对三阴性乳腺癌(TNBC)的诊断及预后的价值。方法搜集经病理检测与免疫组织化学检测证实为TNBC患者47例和非三阴性乳腺癌(nTNBC)患者43例。均行ABVS、MRI、钼靶检查,比较两组患者... 详细信息

目的探讨自动乳腺全容积成像(ABVS)和MRI、钼靶影像学特征对三阴性乳腺癌(TNBC)的诊断及预后的价值。方法搜集经病理检测与免疫组织化学检测证实为TNBC患者47例和非三阴性乳腺癌(nTNBC)患者43例。均行ABVS、MRI、钼靶检查,比较两组患者的临床资料、ABVS、MRI、钼靶影像学特征、不同检查方式对TNBC的诊断效能及预后不同TNBC患者的影像学特征。结果TNBC组患者年龄>35岁、肿瘤直径>2 cm、病理分期为Ⅲ期、淋巴结转移患者占比显著高于nTNBC组(P<0.05);TNBC与nTNBC患者的ABVS(肿块形态、边缘、钙化类型、后方回声衰减)、MRI(肿块大小、形态、边缘、内部强化、表观扩散系数、峰值强化率、峰值时间值)、钼靶检查(钙化情况)影像学特征差异均有统计学意义(P<0.05);ABVS、MRI联合钼靶检查诊断TNBC的特异度、敏感度、准确率、预测率均显著高于单一或任意两种检查方法(P<0.05);TNBC预后良好、预后不良患者钙化情况、汇聚征、后方回声衰减、内部强化、峰值强化率差异均有统计学意义(P<0.05)。结论ABVS、MRI联合钼靶影像学特征在TNBC诊断及预测预后中的应用价值较高。

关键词：三阴性乳腺癌自动乳腺全容积成像磁共振成像乳腺钼靶X线预后