检索结果-南通市图书馆

Synthesis and Adsorption Properties of Polystyrene-supported Chelating Resins Containing Heterocyclic Functional Groups

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2005年第9期16卷 1193-1196页

作者： Chun Nuan JI Rong Jun QU Chun Hua WANG chang mei sun Qing Hua TANG School of Chemistry and Materials Science Yantai Normal University Yantai 264025 School of Materials Science and Engineering Tianjin University Tianjin 300072

A series of new chelating resins with incorporating heterocyclic functional groups： pyridine, thiadizole, benzothizole into macroporous chloromethylated polystyrene were synthesized via hydrophilic spacer arm of polyethylene glycol containing sulfur. These chelating resins were found to show high adsorption capacities for Ag^＋, Hg^2＋, Au^3＋ and Pd^2＋, and the presence of spacer arm can enhance adsorption ability due to increase the hydrophilicity of the chelating resins.

关键词： Chelating resins heterocyclic functional groups spacer ann adsorption metal ions

Synthesis and Adsorption Properties of Chelating Resins Containing Sulfoxide and Heterocyclic Functional Groups

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第10期17卷 1313-1316页

作者： Chun Nuan JI Xiu Juan ZHANG Rong Jun QU Hou CHEN Chun Hua WANG chang mei sun School of Chemistry and Materials Science Yantai Normal University Yantai 264025 Elementary department Yantai Vocational College Yantai 264025

Several of new chelating resins containing sulfoxide and heterocyclic functional groups （3-aminopyridine and 2-mercaptobenzothiazole） based on macroporous chloromethylated polystyrene were synthesized and characterized by elemental analysis and infrared spectra. Their adsorption capacities towards Zn^2＋, Cu^2＋, Pb^2＋, Hg^2＋ and Ag^＋ at pH 3.0 and 6.0 were investigated in detail. It was found that the adsorption capacities of the resins containing bis[（3-pyridylaminoethyl）sulfoxide or （2-benzothiazolylthioethyl）sulfoxide for the above ions were higher than that on ones containing single above-mentioned groups.

关键词： Chelating resins heterocyclic functional groups sulfoxide distribution coefficient,metal ions.

Disentangling microbial coupled fillers mechanisms for the permeable layer optimization process in multi-soil-layering systems

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2025年第1期147卷 538-549页

作者： Daxin sun Chuanping Feng Yongheng Zhan Bingbing Deng Duoduo mei Nan Chen Weiwu Hu School of Water Resources and Environment MOE Key Laboratory of Groundwater Circulation and Environmental EvolutionChina University of Geosciences(Beijing)Beijing 100083China Journal Center China University of Geosciences(Beijing)Beijing 100083China

Themulti-soil-layering(MSL)systems is an emerging solution for environmentally-friendly and cost-effective treatment of decentralized rural domestic ***,the role of the seemingly simple permeable layer has been overlooked,potentially holding the breakthroughs or directions to addressing suboptimal nitrogen removal performance in MSL *** this paper,the mechanism among diverse substrates(zeolite,green zeolite and biological ceramsite)coupled microorganisms in different systems(activated bacterial powder and activated sludge)for rural domestic wastewater purification was *** removal efficiencies performed by zeolite coupled with microorganisms within 3 days were 93.8%for COD,97.1%for TP,and 98.8%for NH_(4)^(+)-***,activated sludge showed better nitrification and comprehensive performance than specialized nitrifying bacteria *** attained an impressive 89.4%NH4+-N desorption efficiency,with a substantive fraction of NH_(4)^(+)-N manifesting as exchanged ***-throughput 16S rRNA gene sequencing revealed that aerobic and parthenogenetic anaerobic bacteria dominated the reactor,with anaerobic bacteria conspicuously *** the heterotrophic nitrificationaerobic denitrification(HN-AD)process was significant,with the presence of denitrifying phosphorus-accumulating organisms(DPAOs)for simultaneous nitrogen and phosphorus *** study not only raises awareness about the importance of the permeable layer and enhances comprehension of the HN-AD mechanism in MSL systems,but also provides valuable insights for optimizing MSL system construction,operation,and rural domestic wastewater treatment.

关键词： Rural domestic wastewater Multi-soil-layering(MSL)system Heterotrophic nitrification-aerobic denitrification(HN-AD) Nitrogen and phosphorus removal Microbial evolution

The interplay between histone modifications and nuclear lamina in genome regulation

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 Genetics and Genomics 2025年第1期52卷 24-38页

作者： chang sun Yanjing Zhao Liping Guo Juhui Qiu Qin Peng Institute of Systems and Physical Biology Shenzhen Bay LaboratoryShenzhen 518132China Faculty of Medicine and Health Sciences Barcelona UniversityBarcelonaSpain Division of Life Science Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina School of Biology and Biological Engineering South China University of TechnologyGuangzhouGuangdong 510006China Key Laboratory for Biorheological Science and Technology of Ministry of Education State and Local Joint Engineering Laboratory for Vascular ImplantsCollege of BioengineeringChongqing UniversityChongqing 400030China

Gene expression is regulated by chromatin architecture and epigenetic remodeling in cell homeostasis and *** modifications act as the key factors to modulate the chromatin *** histone modifications are strongly associated with the localization of *** primarily localizes at the nuclear periphery,where it interacts with lamina proteins to suppress gene *** this review,we summarize the potential bridges that have regulatory functions of histone modifications in chromatin organization and transcriptional regulation at the nuclear *** use lamina-associated domains(LADs)as examples to elucidate the biological roles of the interactions between histone modifications and nuclear lamina in cell differentiation and *** the end,we highlight the technologies that are currently used to identify and visualize histone modifications and LADs,which could provide spatiotemporal information for understanding their regulatory functions in gene expression and discovering new targets for diseases.

关键词： Histone modifications Chromatin organization Nuclear lamina Lamina-associated domain Genome regulation Cell differentiation

Predicting Lactobacillus delbrueckii ***-Streptococcus thermophilus interactions based on a highly accurate semi-supervised learning method

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

Science China(Life Sciences) 2025年第2期68卷 558-574页

作者： Shujuan Yang mei Bai Weichi Liu Weicheng Li Zhi Zhong Lai-Yu Kwok Gaifang Dong Zhihong sun Key Laboratory of Dairy Biotechnology and Engineering Ministry of EducationInner Mongolia Agricultural UniversityHohhot 010018China Key Laboratory of Dairy Products Processing Ministry of Agriculture and Rural AffairsInner Mongolia Agricultural UniversityHohhot 010018China Inner Mongolia Key Laboratory of Dairy Biotechnology and Engineering Inner Mongolia Agricultural UniversityHohhot 010018China Collaborative Innovative Center for Lactic Acid Bacteria and Fermented Dairy Products Ministry of EducationInner Mongolia Agricultural UniversityHohhot 010018China College of Computer and Information Engineering Inner Mongolia Agricultural UniversityHohhot 010018China Inner Mongolia Autonomous Region Key Laboratory of Big Data Research and Application of Agriculture and Animal Husbandry Hohhot 010018China

Lactobacillus delbrueckii ***(***)and Streptococcus thermophilus(***)are commonly used starters in milk *** experiments revealed that *** interactions(Lb St I)substantially impact dairy product quality and *** biological humidity experiments are time-consuming and labor-intensive in screening interaction combinations,an artificial intelligence-based method for screening interactive starter combinations is ***,in the current research on artificial intelligence based interaction prediction in the field of bioinformatics,most successful models adopt supervised learning methods,and there is a lack of research on interaction prediction with only a small number of labeled ***,this study aimed to develop a semi-supervised learning framework for predicting Lb St I using genomic data from 362 isolates(181per species).The framework consisted of a two-part model:a co-clustering prediction model(based on the Kyoto Encyclopedia of Genes and Genomes(KEGG)dataset)and a Laplacian regularized least squares prediction model(based on K-mer analysis and gene composition of all isolates datasets).To enhance accuracy,we integrated the separate outcomes produced by each component of the two-part model to generate the ultimate Lb St I prediction results,which were verified through milk fermentation *** through milk fermentation experiments confirmed a high precision rate of 85%(17/20;validated with 20 randomly selected combinations of expected interacting isolates).Our data suggest that the biosynthetic pathways of cysteine,riboflavin,teichoic acid,and exopolysaccharides,as well as the ATP-binding cassette transport systems,contribute to the mutualistic relationship between these starter bacteria during milk ***,this finding requires further experimental *** presented model and data are valuable resources for academics an

关键词： Lactobacillus delbrueckii subsp.bulgaricus and Streptococcus thermophilus interaction prediction semi-supervised learning dairy starter artificial intelligence milk fermentation

Bifunctional organocatalyst-catalyzed dynamic kinetic resolution of hemiketals for synthesis of chiral ketals via hydrogen bonding control

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2025年第1期36卷 248-252页

作者： Meng Shan Yongmei Yu Mengli sun Shuping Yang Mengqi Wang Bo Zhu Junbiao chang State Key Laboratory of Antiviral Drugs Pingyuan LaboratoryNMPA Key Laboratory for Research and Evaluation of Innovative DrugSchool of Chemistry and Chemical EngineeringHenan Normal UniversityXinxiang 453007China

Herein,we report the dynamic kinetic resolution asymmetric acylation ofγ-hydroxy-γ-perfluoroalkyl butenolides/phthalides catalyzed by amino acid-derived bifunctional organocatalysts,and a series of ketals were obtained in high yields(up to 95%)and excellent enantioselectivities(up to 99%).In terms of synthetic utility,the reaction can be performed on a gram scale,and the product can be converted into potential biological nucleoside analog.

关键词： Bifunctional organocatalyst Dynamic kinetic resolution Hemiketal Chiral ketals Hydrogen bonding

低聚对位芳纶化学修饰多壁碳纳米管的制备及性能

在线全文

学校读者我要写书评

暂无评论

高分子学报 2018年第7期28卷 878-885页

作者：贾欣桦曲荣君孙昌梅安凯付饶牟英蕾鲁东大学化学与材料科学学院烟台264025

为改善多壁碳纳米管的表面性能及分散性能,将低聚的氨基为端基的低分子量的对位芳纶(PPTA)与羧基碳纳米管(MWCNTs-COOH)反应,制备了低聚PPTA化学修饰的多壁碳纳米管PPTAMWCNTs-x,并对其结构进行了表征.研究结果表明,与MWCNTs-COOH相比,P... 详细信息

为改善多壁碳纳米管的表面性能及分散性能,将低聚的氨基为端基的低分子量的对位芳纶(PPTA)与羧基碳纳米管(MWCNTs-COOH)反应,制备了低聚PPTA化学修饰的多壁碳纳米管PPTAMWCNTs-x,并对其结构进行了表征.研究结果表明,与MWCNTs-COOH相比,PPTA-MWCNTs-x在二甲基亚砜(DMSO)、氮甲基吡咯烷酮(NMP)、乙醇等有机溶剂中具有更好的稳定性和分散性,其稳定时间可分别长达216和240 h.本文以廉价的聚氯乙烯(PVC)为样板聚合物,采用浇铸法制备了碳纳米管/聚合物复合材料,比较了改性前后多壁碳纳米管对PVC薄膜力学性能的影响,并探讨了其增强机理.结果显示,与纯PVC薄膜相比,当PPTA-MWCNTs-x添加量为0.25 wt%时,可使PVC复合膜的杨氏模量和拉伸强度分别提高44.4%和79.4%;当PPTA-MWCNTs-x添加量为0.05 wt%时,可使PVC复合膜断裂应变提高203.6%.

关键词：多壁碳纳米管低聚对苯二甲酰对苯二胺化学修饰 PVC复合材料

Underground laboratories·Deep underground observation·Scientific questions——Insights from observations of multi-physic fields in deep underground labs

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2025年第2期68卷 343-362页

作者： Huiqi REN Yun WANG chang CHEN Guangyu FU Longqing QIU Lianghui GUO Chengliang XIE Yongsheng HE Heping sun Jiwen TENG Institute of Defense Engineering Academy of Military SciencesBeijing 100850China State Kay Laboratory of Geological Processes and Mineral Resources Key Laboratory of Intraplate Volcanoes and EarthquakesMinistry of EducationChina University of Geosciences(Beijing)Beijing 100083China Shanghai Institute of Microsystem and Information Technology Chinese Academy of SciencesShanghai 200050China Innovation Academy for Precision Measurement Science and Technology Chinese Academy of SciencesWuhan 430077China Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China

This paper presents a comprehensive review on recent development and research conducted in domestic and international underground laboratories. We first introduce the differences in three environments—surface, mountain tunnel cavities and underground coal mine tunnels—by examining cosmic ray background, ambient noises related to gravity and seismic measurement, and electromagnetic noises in magnetic and magnetotelluric measurements. We highlight potential misuse of the term Underground Lab or Deep Underground Lab when describing observations in different physical fields. We introduce unique features of underground coal mine tunnels in China, such as large spaces, ultra-quiet conditions, and ultra-clean environments. When comparing with mountain tunnel cavities and borehole observations, coal mine tunnel observations have superior long-term stability and high precision. Through observations and comparisons of multi-physic fields at surface and the deep underground, we find that the higher SNR seismic observations conducted in deep underground tunnels in coal mines are beneficial to improve velocity tomography of the solid earth. The gravity observation with a Superconducting Quantum Interference Device(SQUID) makes it possibly to capture slow earthquake, which has not been observed previously in the Chinese mainland. SQUID magnetic observations can detect fluctuations as weak as femto-Tesla(fT), enabling us to explore the attenuation of Schumann Resonance down to the solid Earth. This opens opportunities to investigate the connections between the Earth's magnetic field and the interactions within the human brain and heart. To improve the precision of quantum measurement,we should consider the possible effects of weak magnetic disturbances in deep underground environments. Finally, we discuss the importance of deep underground laboratories, observing facilities and techniques deployed in these laboratories, and their possible connection with respect to “deep space” an

关键词： Deep underground Multi-physic fields Super-high precision Slow earthquake Schumann Resonance Quantum measurement

同方期刊数据库

Soil Carbon Restoration and Its Influencing Factors in Coal Mining Areas of Yellow River Basin：A Meta-analysis

在线全文

学校读者我要写书评

暂无评论

Huanjing Kexue/Environmental Science 2025年第3期46卷 1690-1702页

作者： sun, Hong-Wei Yan, mei-Fang College of Environment and Ecology Taiyuan University of Technology Jinzhong030600 China

Coal mining has caused notable disturbance and destruction to the ecosystem，leading to intensified regional carbon emissions. Ecological restoration of abandoned coal mines can improve the physical and chemical properties of damaged soil and increase soil carbon storage. Therefore，ecological restoration of coal mine areas is crucial for improving regional carbon sink levels and environments. Currently，most studies on ecological restoration in Chinese coal mining areas are scattered across the major coal-producing provinces in the Yellow River Basin. Its effect on soil carbon sequestration at a basin scale must be crucially elucidated. In this study，we focused on changes in soil physicochemical properties and enzyme activities after vegetation restoration using an integrated analysis method，combined with climate and soil characteristics in the Yellow River Basin’s coal mining areas to reveal the major factors affecting soil carbon restoration. Our results showed that：① Soil physicochemical properties and enzyme activities were improved significantly after ecological restoration;however，some differences were present among different soil layers. ② Soil organic carbon（SOC），total nitrogen，and alkali-hydrolyzed nitrogen increased by 62.2%，40.5%，and 36.0%，respectively，showing an overall increasing trend with increasing restoration years. From the perspective of vegetation type，mixed forest had the largest increment in SOC. ③ The increase in nitrogen and phosphorus content improved soil fertility and helped to increase soil carbon input from vegetation litter，thus promoting the restoration of the soil organic carbon pool. In addition，average annual temperature and precipitation along with soil type also played important roles affecting soil C restoration. In the future，based on climate and soil characteristics of specific mining areas，suitable vegetation types should be selected from a perspective of C sequestration to enhance C sink of the whole basin. © 2025 Science Press

关键词： Carbon sequestration