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石菖蒲挥发油成分的气相色谱-质谱实验结果分析

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北方药学 2024年第8期21卷 1-3,7页

作者：谢芳刘智勇陈惠云福建中医药大学附属人民医院药剂科福建福州350001

目的:对石菖蒲挥发油成分的气相色谱-质谱实验结果进行分析。方法:借助水蒸馏法得到石菖蒲根茎部位挥发油,以GC-MS技术分离鉴定,用气相色谱面积归一法测定挥发油中相应成分含量。结果:经过分析,结果显示挥发油中化合物种类超过一百多种... 详细信息

目的:对石菖蒲挥发油成分的气相色谱-质谱实验结果进行分析。方法:借助水蒸馏法得到石菖蒲根茎部位挥发油,以GC-MS技术分离鉴定,用气相色谱面积归一法测定挥发油中相应成分含量。结果:经过分析,结果显示挥发油中化合物种类超过一百多种,共有25种相对含量高于0.01%的化合物,占总量92.37%,含量较高的2种分别为α-细辛醚,比例为32.29%,β-细辛醚,比例为53.59%。α-细辛醚回收率为100.2%,β-细辛醚回收率为103.1%,α-细辛醚以及β-细辛醚重复性、精确性以及稳定性均未超过2%。测定时间持续20分钟,石菖蒲挥发油5个批次β-细辛醚含量为(534.82±1.50)mg/g,α-细辛醚含量(57.04±0.69)mg/g。结论:对石菖蒲挥发油应用GC-MS技术进行鉴定,发现α-细辛醚以及β-细辛醚均为主要成分,含量最高的是β-细辛醚。

关键词：石菖蒲挥发油气相色谱-质谱分析

Evaluation of the Role of Mixed Amino Acids in Nitrate Uptake and Assimilation in Leafy Radish by Using ^(15)N-Labeled Nitrate

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Agricultural Sciences in China 2008年第10期7卷 1196-1202页

作者： LIU Xing-quan chen hui-yun NI Qin-xue Lee Kyu Seung International Research Center of Spatial Ecology and Ecosystem Ecology Zhejiang Forestry University Hangzhou 311300 P.R.China Institute of Agricultural Products Processing Ningbo Academy of Agricultural Sciences Ningbo 315040 P.R.China School of Agriculture and Food Science Zhejiang Forestry University Hangzhou 311300 P.R.China Department of Agricultural Chemistry Chungnam National University Daejeon 305-764 Korea

In this paper, the role of mixed amino acids in nitrate uptake and assimilation was evaluated in leafy radish by using ^15N labeled nitrate. The mixtures of alanine, β-alanine, aspartic acid, asparagines, glutamic acid, glutamine, and glycine were sprayed to plant leaf two or four times. The activity of the enzymes related to the process of NO3- reduction （nitrate reductase, nitrite reductase and glutamine synthetase） was affected differently depending on the application rate of mixed amino acids. Applying mixed amino acids increased the fresh weight, dry weight, and N yield. The NO3 content was reduced to 24-38%, but no significant differences were observed in amino acids and proteins. In addition, the nitrogen derived from fertilizer and the ^15N-NO3-recovery rate increased to 2-8% and 15-47%, respectively. These results strongly suggest that the positive effect of mixed amino acids on nitrate uptake and assimilation might be attributed to the regulation on NO3- uptake and assimilation, but not to the preference for amino acids as sources of reduced nitrogen.

关键词： amino acid leafy radish nitrate assimilation nitrate uptake, ^15N-NO3

Neuroimmune interactions and their roles in neurodegenerative diseases

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Fundamental Research 2024年第2期4卷 251-261页

作者： Bai-Rong chen Ting Wu Ting-hui chen yun Wang Neuroscience Research Institute and Department of Neurobiology School of Basic Medical SciencesKey Laboratory for NeuroscienceMinistry of Education/National Health Commission and State Key Laboratory of Natural and Biomimetic DrugsPeking UniversityBeijing 100083China PKU-IDG/McGovern Institute for Brain Research Peking UniversityBeijing 100871China

The nervous system possesses bidirectional,sophisticated and delicate communications with the immune *** neuroimmune interactions play a vitally important role in the initiation and development of many disorders,especially neurodegenerative *** scientific advancements have made tremendous progress in this field during the last few years,neuroimmune communications are still far from being *** organizing recent research,in this review,we discuss the local and intersystem neuroimmune interactions and their roles in Alzheimer’s disease,Parkinson’s disease and amyotrophic lateral *** these will help us gain a better understanding of the process of interplay inside the body and how the organism maintains *** will also facilitate a view of the diseases from a holistic,pluralistic and interconnected perspective,thus providing a basis of developing novel and effective methods to diagnose,intervene and treat diseases.

关键词： Nervous system Immune system Neuroimmune interactions Alzheimer’s disease Parkinson’s disease Amyotrophic lateral sclerosis

Effect of crystal morphology of ultrahigh-nickel cathode materials on high temperature electrochemical stability of lithium ion batteries

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Journal of Energy Chemistry 2024年第1期88卷 327-335,I0008页

作者： Bi Luo hui Li Haoyu Qi yun Liu Chuanbo Zheng Weitong Du Jiafeng Zhang Lai chen School of Metallurgy Engineering Jiangsu University of Science and TechnologyZhangjiagang 215600JiangsuChina National Engineering Laboratory for High-Efficiency Recovery of Refractory Nonferrous Metals School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083HunanChina School of Materials Science and Engineering Beijing Key Laboratory of Environmental Science and EngineeringBeijing Institute of TechnologyBeijing 100081China

Higher nickel content endows Ni-rich cathode materials LiNi_(x)Co_yMn_(1-x-y)O_(2)(x>0.6)with higher specific capacity and high energy density,which is regarded as the most promising cathode materials for Li-ion ***,the deterioration of structural stability hinders its practical application,especially under harsh working conditions such as high-temperature *** these circumstances,it becomes particularly critical to clarify the impact of the crystal morphology on the structure and high-temperature performance as for the ultrahigh-nickel ***,we conducted a comprehensive comparison in terms of microstructure,high-temperature long-cycle phase evolution,and high-temperature electrochemical stability,revealing the differences and the working mechanisms among polycrystalline(PC),single-crystalline(SC)and Al doped SC ultrahigh-nickel *** results show that the PC sample suffers a severe irreversible phase transition along with the appearance of microcracks,resulting a serious decay of both average voltage and the energy *** the Al doped SC sample exhibits superior cycling stability with intact layered ***-situ XRD and intraparticle structural evolution characterization reveal that Al doping can significantly alleviate the irreversible phase transition,thus inhibiting microcracks generation and enabling enhanced ***,it exhibits excellent cycling performance in pouch-type full-cell with a high capacity retention of 91.8%after 500 cycles at 55℃.This work promotes the fundamental understanding on the correlation between the crystalline morphology and high-temperature electrochemical stability and provides a guide for optimization the Ni-rich cathode materials.

关键词： Single-crystalline Ultrahigh-nickel cathode High-temperature performance Phase evolution

A Dynamic Covalent Bonding-based Nanoplatform for Intracellular Co-Delivery of Protein Drugs and Chemotherapeutics with Enhanced Anti-Cancer Effect

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Chinese Journal of Polymer Science 2024年第5期42卷 559-569,I0005页

作者： Sai-Nan Liu Jia-hui Meng Li-yun Cui Hua chen Lin-Qi Shi Ru-Jiang Ma Key Laboratory of Functional Polymer Materials of Ministry of Education Institute of Polymer ChemistryTianjin Key Laboratory of Functional Polymer MaterialsState Key Laboratory of Medicinal Chemical BiologyFrontiers Science Center for New Organic MatterCollege of ChemistryNankai UniversityTianjin300071China Haihe Laboratory of Sustainable Chemical Transformations Tianjin300192China

Efficient intracellular delivery of protein drugs is critical for protein *** combination of protein drugs with chemotherapeutics represents a promising strategy in enhancing anti-cancer ***,co-delivery systems for efficient delivery of these two kinds of drugs are still lacking because of their different ***,we show a well-designed delivery system based on dynamic covalent bond for efficient intracellular co-delivery of ribonuclease A(RNase A)and doxorubicin(DOX).Two polymers,PEG-b-P(Asp-co-AspDA)and PAE-b-P(Asp-co-AspPBA),and two 2-acetylphenylboronic acid(2-APBA)-functionalized drugs,2-APBA-RNase A and 2-APBA-DOX,self-assemble into mixed-shell nanoparticles(RNase A/DOX@MNPs)via dynamic phenylboronic acid(PBA)-catechol bond between PBA and dopamine(DA)*** PBA-catechol bond endows the nanoparticles with high stability and excellent stimulus-responsive drug release *** the slight acidic environment at tumor tissue,RNase A/DOX@MNPs are positively charged,promoting their *** cellular uptake into endosome,further protonation of PAE chains leads to the rupture of endosomes because of the proton sponge effect and the cleavage of PBA-catechol bond promotes the release of two *** cytoplasm,the high level of GSH removed the modification of 2-APBA on *** restored RNase A and DOX show a synergistic and enhanced antic-cancer *** system may be a promising platform for intracellular co-delivery of protein drugs and chemotherapeutics.

关键词： Drug co-delivery Combination therapy Dynamic covalent bond

Study on the clogging mechanism of punching screen in sand control by the punching structure parameters

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Petroleum Science 2024年第1期21卷 609-620页

作者： Fu-cheng Deng Fu-Lin Gui Bai-Tao Fan Lei Wen Sheng-Hong chen Ning Gong yun-chen Xiao Zhi-hui Xu Yangtze University Jingzhou434023HubeiChina CNOOC Research Institute Ltd. Beijing100028China CNOOC Ener Tech-Drilling&Production Co. Tianjin300457China Tianjin Branch of CNOOC Ltd. Tianjin300459China

As an independent sand control unit or a common protective shell of a high-quality screen,the punching screen is the outermost sand retaining unit of the sand control pipe which is used in geothermal well or oil and gas ***,most screens only consider the influence of the internal sand retaining medium parameters in the sand control performance design while ignoring the influence of the plugging of the punching screen on the overall sand retaining performance of the *** explore the clogging mechanism of the punching screen,this paper established the clogging mechanism calculation model of a single punching screen sand control unit by using the computational fluid mechanics-discrete element method(CFD-DEM)combined *** to the combined motion of particles and fluids,the influence of the internal flow state on particle motion and accumulation was *** results showed that(1)the clogging process of the punching sand control unit is divided into three stages:initial clogging,aggravation of clogging and stability of *** the initial stage of blockage,coarse particles form a loose bridge structure,and blockage often occurs preferentially at the streamline gathering place below chamfering inside the sand control *** the stage of blockage intensification,the particle mass develops into a relatively complete sand bridge,which develops from both ends of the opening to the center of the *** the stable plugging stage,the sand deposits show a“fan shape”and form a“V-shaped”gully inside the punching slot element.(2)Under a certain reservoir particle-size distribution,The slit length and opening height have a large influence on the permeability and blockage rate,while the slit width size has little influence on the permeability and blockage *** microscopic clogging mechanism and its law of the punching screen prevention unit are proposed in this study,which has some field guidance significance for the design of punching screen

关键词： Punching screen Plugging CFD-DEM Size parameter Sand control

Construction of the underlying circRNA-miRNA-mRNA regulatory network and a new diagnostic model in ulcerative colitis by bioinformatics analysis

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World Journal of Clinical Cases 2024年第9期12卷 1606-1621页

作者： Yu-Yi Yuan hui Wu Qian-yun chen Heng Fan Bo Shuai Department of Integrated Traditional Chinese and Western Medicine Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022Hubei ProvinceChina

BACKGROUND Circular RNAs(circRNAs)are involved in the pathogenesis of many diseases through competing endogenous RNA(ceRNA)regulatory *** To investigate a circRNA-related ceRNA regulatory network and a new predictive model by circRNA to understand the diagnostic mechanism of circRNAs in ulcerative colitis(UC).METHODS We obtained gene expression profiles of circRNAs,miRNAs,and mRNAs in UC from the Gene Expression Omnibus *** circRNA-miRNA-mRNA network was constructed based on circRNA-miRNA and miRNA-mRNA *** enrichment analysis was performed to identify the biological mechanisms involved in *** identified the most relevant differential circRNAs for diagnosing UC and constructed a new predictive nomogram,whose efficacy was tested with the C-index,receiver operating characteristic curve(ROC),and decision curve analysis(DCA).RESULTS A circRNA-miRNA-mRNA regulatory network was obtained,containing 12 circRNAs,three miRNAs,and 38 *** optimal prognostic-related differentially expressed circRNAs,hsa_circ_0085323 and hsa_circ_0036906,were included to construct a predictive *** model showed good discrimination,with a C-index of 1(>0.9,high accuracy).ROC and DCA suggested that the nomogram had a beneficial diagnostic *** This novel predictive nomogram incorporating hsa_circ_0085323 and hsa_circ_0036906 can be conveniently used to predict the risk of *** circRNa-miRNA-mRNA network in UC could be more clinically significant.

关键词： Circular RNAs RNA regulatory network Ulcerative colitis New predictive model Bioinformatics Diagnose

基于网络药理学和分子对接技术探讨沙棘多酚治疗阿尔茨海默病的作用机制

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海南医学 2024年第7期35卷 982-990页

作者：田小平罗郑夏军淮文英刘丹熊鹰陈云慧何林熹成都中医药大学四川成都611137 四川大学四川成都610041

目的基于网络药理学—分子对接技术的方法初步探讨沙棘多酚治疗阿尔兹海默症(Alzheimer’s disease,AD)的作用机制。方法检索中国知网、万方数据库查找目前报道的沙棘多酚化学成分,获得沙棘多酚有效活性成分及预测靶基因。通过Cytoscape... 详细信息

目的基于网络药理学—分子对接技术的方法初步探讨沙棘多酚治疗阿尔兹海默症(Alzheimer’s disease,AD)的作用机制。方法检索中国知网、万方数据库查找目前报道的沙棘多酚化学成分,获得沙棘多酚有效活性成分及预测靶基因。通过Cytoscape 3.8.2软件构建中药—化合物—靶点(基因)网络;采用Gencards、OMIM、DisGeNET等数据库获取AD主要作用靶点,并与化合物基因靶点作韦恩图、明确交集靶点,运用String平台构建蛋白相互作用(PPI)网络模型并挖掘网络中潜在的蛋白质功能模块;通过Metascape平台进行基因本体(GO)功能富集分析及基于京都基因与基因组百科全书(KEGG)通路富集分析,预测其生物过程及作用通路。应用Cytoscape3.8.2软件构建“药物成分-作用靶点-作用通路”网络,运用AutoDock vina软件对核心成分及关键靶点进行分子对接。结果共获得12个沙棘多酚候选化合物、142个成分靶点以及95个沙棘多酚与AD的共同靶点。网络分析结果显示,沙棘多酚调治AD的核心活性成分为阿魏酸、藜芦酸、咖啡酸等,核心靶点包括ALB、EGFR、PTGS2、STAT3、CTNNB1、MMP9、ESR1、TLR4、ICAM1和PPARA。GO和KEGG分析显示,沙棘多酚治疗AD的通路主要富集在化学致癌-受体活化、癌症的通路和糖尿病并发症中的AGE-RAGE信号通路等。其功能主要为氧化还原酶活性、丝氨酸水解酶活性和金属蛋白酶活性等。分子对接研究显示,沙棘多酚的5个关键治疗AD的化合物可与5个核心基因的对接口袋相匹配。结论沙棘多酚可通过多个化合物作用于多个分子靶点和通路发挥对AD的治疗作用。

关键词：沙棘多酚阿尔兹海默症网络药理学分子对接作用机制

Prediction of suitable water content in granulation of sintering mixture based on Litster's model

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Journal of Iron and Steel Research International 2024年第3期31卷 552-560页

作者： Fang-lei Dai Xiao-hui Fan Xiao-xian Huang Xu-ling chen Min Gan Zhi-yun Ji Zeng-qing Sun School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina

Suitable water content plays a decisive role in the granulation of sintering ***,a method was proposed to predict the suitable water content for effective granulation on the basis of Litster's granulation *** granulation effectiveness of a sintering mixture was predicted by the model,with the allowance error of±10%.The effects of the water absorption properties,particle size composition and content of adhesive particles on the suitable water content were *** results showed that the allowable error of prediction was within±0.5%compared to the experimentally determined suitable water *** an increase in adhesive powder content of mixtures with higher water absorption,the suitable water content increased to achieve similar granulation ***,as the amount of concentrates increased,the suitable water content first increased and then remained *** influence of the water absorption characteristics of the adhesive particles on the suitable water content was less than that of their particle size composition in the mixture.

关键词： Adhesive particle Sintering mixture Granulation effectiveness Suitable water content