检索结果-南通市图书馆

Gold-catalyzed intermolecular amination of allyl azides with ynamides: Efficient construction of 3-azabicyclo[3.1.0] scaffold

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2025年第2期36卷 384-388页

作者： Chong-Yang Shi Jian-Xing Gong Zhen li Chao Shu Long-Wu Ye qing Sun Bo Zhou Xin-Qi Zhu College of Chemistry and Chemical Engineering Yunnan Normal University Key Laboratory of Chemical Biology of Fujian Province State Key Laboratory of Physical Chemistry of Solid Surfacesand College of Chemistry and Chemical EngineeringXiamen University State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of Sciences Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong University

Gold-catalyzed amination reactions based on azides via α-imino gold carbene intermediates have attracted extensive attention in the past decades because this methodology leads to the facile and efficient construction of synthetically useful N-containing molecules, especially valuable N-heterocycles. However,successful examples of intermolecular generation of α-imino gold carbenes by using azides as amination reagents are rarely explored probably due to the weak nucleophilicity of azides. Herein, we disclose an efficient gold-catalyzed intermolecular aminative cyclopropanation of ynamides with the allyl azides, enabling flexible synthesis of a wide range of valuable 3-azabicyclo[3.1.0]hex–2-ene derivatives in good to excellent yields with excellent diastereoselectivities. Importantly, this protocol represents the first use of allyl azide as an efficient amination reagent in gold-catalyzed alkyne amination reactions.

关键词： Alkynes Amination Azides Gold Heterocycles

Hawking radiation and Page curve of regular black holes

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2025年第2期34卷 178-187页

作者： Chen-Yang dong li-Jun Tian Department of Physics Shanghai UniversityShanghai 200444China

We discuss the information paradox and its implications for regular black holes. Our primary focus is on Page curve using the island treatment and analyzing relevant parameters like Page time and scrambling time. Calculations without considering the island show that the entanglement entropy increases linearly and continues to infinity. When we consider the generalized entropy, we find that the island extends just beyond the horizon, leading to a constant entanglement ***, we find that in the early stages, the island never forms, regardless of the charge and mass configuration of the black hole.

关键词： black holes AdS/CFT correspondence Page curve

A low redox potential and long life organic anode material for sodium-ion batteries

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 557-564页

作者： Zhi li Yang Wei Kang Zhou Xin Huang Xing Zhou Jie Xu Taoyi Kong Junwei Lucas Bao Xiaoli dong Yonggang Wang Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Institute of New EnergyCollaborative Innovation Center of Chemistry for Energy Materials(iChEM)Fudan UniversityShanghai 200433China Department of Chemistry Boston CollegeChestnut HillMA 02467USA School of Materials Science and Engineering Anhui University of TechnologyMa’anshan 243002AnhuiChina

Sodium-ion batteries (SIBs) with organic electrodes are an emerging research direction due to the sustainability of organic materials based on elements like C,H,O,and sodium ***,organic electrode materials for SIBs are mainly used as cathodes because of their relatively high redox potentials(>1 V).Organic electrodes with low redox potential that can be used as anode are ***,a novel organic anode material (tetrasodium 1,4,5,8-naphthalenetetracarboxylate,Na_(4)TDC) has been developed with low redox potential (lic *** three-sodium storage mechanism was demonstrated with various in-situ/ex-situ spectroscopy and theoretical calculations,showing a high capacity of 208 mAh/g and an average decay rate of merely 0.022%per ***,the Na_(4)TDC-hard carbon composite can further acquire improved capacity and cycling stability for 1200 cycles even with a high mass loading of up to 20 mg cm^(-2).By pairing with a thick Na_(3)V_(2)(PO_(4))_(3)cathode (20.6 mg cm^(-2)),the as-fabricated full cell exhibited high operating voltage (2.8 V),excellent rate performance and cycling stability with a high capacity retention of 88.7% after 200 cycles,well highlighting the Na_(4)TDC anode material for SIBs.

关键词： Organic anode material Low redox potential Composite anode Sodium-ion batteries

在线全文

学校读者我要写书评

暂无评论

冷冻食品货架期研究现状及发展趋势

食品科学 2010年第1期31卷 258-261页

作者：宋晨刘宝林董庆利上海理工大学食品质量与安全研究所上海200093

食品货架期作为反应食品品质及安全性的标识,对它进行研究具有现实意义。文章对冷冻食品货架期进行了全面介绍,并说明了温度对冷冻食品货架期及品质的重要影响。由于冷冻食品的特殊性及冷链物流中存在的问题,在波动温度下对冻品货架期... 详细信息

食品货架期作为反应食品品质及安全性的标识,对它进行研究具有现实意义。文章对冷冻食品货架期进行了全面介绍,并说明了温度对冷冻食品货架期及品质的重要影响。由于冷冻食品的特殊性及冷链物流中存在的问题,在波动温度下对冻品货架期做出预测已成为研究的焦点。本文通过对冷冻食品货架期研究中的3个重要阶段及目前研究重点的阐述,指出了未来冷冻食品货架期研究的创新点与发展方向。

关键词：冷冻食品货架期储藏温度

气调保鲜冷却猪肉中假单胞菌最小检出生长时间模型的构建

在线全文

学校读者我要写书评

暂无评论

食品科学 2013年第13期34卷 152-156页

作者：邱静董庆利胡孟晗上海理工大学医疗器械与食品学院上海200093

主要将气调保鲜冷却猪肉中的优势腐败菌之一的假单胞菌接种到灭菌肉上,在(4±1)℃条件下,通过运用线性回归方程构建不同气调比例下假单胞菌的最小检出生长时间(time-to-detection,TTD)模型。结果表明:假单胞菌的最小检出生长时间在无CO... 详细信息

主要将气调保鲜冷却猪肉中的优势腐败菌之一的假单胞菌接种到灭菌肉上,在(4±1)℃条件下,通过运用线性回归方程构建不同气调比例下假单胞菌的最小检出生长时间(time-to-detection,TTD)模型。结果表明:假单胞菌的最小检出生长时间在无CO2的情况下,会随着O2体积分数的增加而减小;但会随着CO2体积分数的增加而增大。初始接种量的增大也会减小最小检出生长时间,但是当接种浓度大于102CFU/mL,减小并不明显。TTD模型的拟合度良好,回归系数(r2)高达0.959,实际观测值与模型预测值的判定系数R2均高于0.986,模型的偏差因子(Bf)和准确因子(Af),分别为1.012和1.086,均接近1。

关键词：气调保鲜冷却猪肉最小检出生长时间 TTD模型假单胞菌

noxs基因:病原菌菌膜形成及毒力调控的潜在靶点

在线全文

学校读者我要写书评

暂无评论

食品科学 2014年第3期35卷 234-237页

作者：陈国薇张超董庆利吴淑燕刘箐上海理工大学医疗器械与食品学院上海200093

noxs基因介导产生的活性氧(reactive oxygen species,ROS)是动植物细胞中普遍存在的"胁迫应答信号分子"。有研究表明细菌中也存在类似的noxs基因,当病原细菌面临不良生存环境时,该基因被激活并通过产生ROS来调控菌膜形成和细菌毒力因子... 详细信息

noxs基因介导产生的活性氧(reactive oxygen species,ROS)是动植物细胞中普遍存在的"胁迫应答信号分子"。有研究表明细菌中也存在类似的noxs基因,当病原细菌面临不良生存环境时,该基因被激活并通过产生ROS来调控菌膜形成和细菌毒力因子,本文对noxs基因及其介导产生的ROS在此过程中的作用予以综述。

关键词： noxs基因菌膜形成毒力调控

Single-cell omics: experimental workflow, data analyses and applications

在线全文

学校读者我要写书评

暂无评论

Science China(life Sciences) 2025年第1期68卷 5-102页

作者： Fengying Sun Haoyan li dongqing Sun Shaliu Fu Lei Gu Xin Shao Qinqin Wang Xin dong Bin Duan Feiyang Xing Jun Wu Minmin Xiao Fangqing Zhao Jing-dong J.Han Qi liu Xiaohui Fan Chen li Chenfei Wang Tieliu Shi Department of Clinical Laboratory the Affiliated Wuhu Hospital of East China Normal University(The Second People’s Hospital of Wuhu City)Wuhu 241000China Pharmaceutical Informatics Institute College of Pharmaceutical SciencesZhejiang UniversityHangzhou 310058China Key Laboratory of Spine and Spinal Cord Injury Repair and Regeneration(Tongji University) Ministry of EducationOrthopaedic DepartmentTongji HospitalBioinformatics DepartmentSchool of Life Sciences and TechnologyTongji UniversityShanghai 200082China Frontier Science Center for Stem Cells School of Life Sciences and TechnologyTongji UniversityShanghai 200092China Translational Medical Center for Stem Cell Therapy and Institute for Regenerative Medicine Shanghai East HospitalBioinformatics DepartmentSchool of Life Sciences and TechnologyTongji UniversityShanghai 200082China Research Institute of Intelligent Computing Zhejiang LabHangzhou 311121China Shanghai Research Institute for Intelligent Autonomous Systems Shanghai 201210China Center for Single-cell Omics School of Public HealthShanghai Jiao Tong University School of MedicineShanghai 200025China National Key Laboratory of Chinese Medicine Modernization Innovation Center of Yangtze River DeltaZhejiang UniversityJiaxing 314103China Center for Bioinformatics and Computational Biology Shanghai Key Laboratory of Regulatory Biologythe Institute of Biomedical Sciences and School of Life SciencesEast China Normal UniversityShanghai 200241China Beijing Institutes of life Science Chinese Academy of SciencesBeijing 100101China Peking-Tsinghua Center for life Sciences Academy for Advanced Interdisciplinary StudiesCenter for Quantitative Biology(CQB)Peking UniversityBeijing 100871China Zhejiang Key Laboratory of Precision Diagnosis and Therapy for Major Gynecological Diseases Women’s HospitalZhejiang University School of MedicineHangzhou 310006China Key Laboratory of Advanced Theory and Application in Statistics and Data Science-MOE School of StatisticsEast China Normal U

Cells are the fundamental units of biological systems and exhibit unique development trajectories and molecular *** exploration of how the genomes orchestrate the formation and maintenance of each cell,and control the cellular phenotypes of various organismsis,is both captivating and *** the inception of the first single-cell RNA technology,technologies related to single-cell sequencing have experienced rapid advancements in recent *** technologies have expanded horizontally to include single-cell genome,epigenome,proteome,and metabolome,while vertically,they have progressed to integrate multiple omics data and incorporate additional information such as spatial scRNA-seq and CRISPR ***-cell omics represent a groundbreaking advancement in the biomedical field,offering profound insights into the understanding of complex diseases,including ***,we comprehensively summarize recent advances in single-cell omics technologies,with a specific focus on the methodology *** overview aims to guide researchers in selecting appropriate methods for single-cell sequencing and related data analysis.

关键词： single-cell sequencing genome epigenome proteomics metabolomics multimodal spatial transcriptomics CRISPR screening

High-throughput screening and evaluation of double-linker metal–organic frameworks for CO_(2)/H_(2)adsorption and separation

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2025年第2期34卷 408-417页

作者： Ji-Long Huang Xiu-Ying liu Hao Chen Xiao-dong li Jing-Xin Yu School of Physics Henan University of TechnologyZhengzhou 450001China R&D Center for Advanced Energy Materials Henan University of TechnologyZhengzhou 450001China

The capture of CO_(2)from CO_(2)/H_(2)gas mixtures in syngas is a crucial issue for hydrogen production from steam methane reforming in industry,as the presence of CO_(2)directly affects the purity of H_(2).A combination of a high-throughput screening method and grand canonical Monte Carlo simulation was utilized to evaluate and screen 1725 metal–organic frameworks(MOFs)in detail as a means of determining their adsorption performance for CO_(2)/H_(2)gas *** adsorption and separation performance of double-linker MOFs was comprehensively evaluated using eight evaluation indicators,namely,the largest cavity diameter,accessible surface area,pore occupied accessible volume,porosity,adsorption selectivity,working capacity,adsorbent performance score and percent *** optimal performance frameworks were screened to further study their single-component adsorption and binary competitive adsorption of CO_(2)/H_(2)*** CO_(2)adsorption selectivity at different CO_(2)/H_(2)feed ratios was also evaluated,which indicated their excellent adsorption and separation *** microscopic adsorption mechanisms for CO_(2)and H_(2)at the molecular level were investigated by analyzing the radial distribution function and density *** study may provide directional guidance and reference for subsequent experiments on the adsorption and separation of CO_(2)/H_(2).

关键词： metal–organic framework adsorption separation high-throughput screening grand canonical Monte Carlo simulation

数据预处理在电子鼻评价鸡蛋新鲜度中的应用研究

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

上海理工大学学报 2010年第6期32卷 584-588页

作者：潘磊庆刘明詹歌董庆利孔静屠康南京农业大学食品科技学院南京210095 上海理工大学医疗器械与食品学院上海200093 华南理工大学轻工与食品学院广州510641

采用电子鼻技术对鸡蛋新鲜度进行评价,采用主成分分析处理电子鼻响应数据.为选取合适的电子鼻数据预处理方法,以主成分贡献率及马氏距离分辨力为指标,比较了4种数据预处理方法对电子鼻检测鸡蛋新鲜度准确性的差异,分析了产生差异的原因... 详细信息

采用电子鼻技术对鸡蛋新鲜度进行评价,采用主成分分析处理电子鼻响应数据.为选取合适的电子鼻数据预处理方法,以主成分贡献率及马氏距离分辨力为指标,比较了4种数据预处理方法对电子鼻检测鸡蛋新鲜度准确性的差异,分析了产生差异的原因.结果表明:Z-标准化对电子鼻数据预处理的方法能较好地区分鸡蛋新鲜度差异.

关键词：数据预处理电子鼻鸡蛋新鲜度评价