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白鹤灵芝化学成分及其体外抗肿瘤与降脂活性研究

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中成药 2024年第8期46卷 2630-2637页

作者：龚志强肖阳韩沙刘颖齐晋霍宇黄艳红杨立芳广西中医药大学赛恩斯新医药学院瑶医药学院广西壮瑶药重点实验室广西南宁530200 广西民族大学化学化工学院广西林产化学与工程重点实验室广西南宁530008

目的研究白鹤灵芝的化学成分及其体外抗肿瘤与降脂活性。方法白鹤灵芝乙酸乙酯部位采用正相、反相硅胶柱和半制备HPLC分离纯化,根据理化性质及波谱数据鉴定所得化合物的结构。采用MTT法测定体外抗肿瘤活性,采用油酸诱导的HepG2高脂细胞... 详细信息

目的研究白鹤灵芝的化学成分及其体外抗肿瘤与降脂活性。方法白鹤灵芝乙酸乙酯部位采用正相、反相硅胶柱和半制备HPLC分离纯化,根据理化性质及波谱数据鉴定所得化合物的结构。采用MTT法测定体外抗肿瘤活性,采用油酸诱导的HepG2高脂细胞模型评价体外降脂活性。结果从中分离得到20个化合物,分别鉴定为rhinacanthin A(1)、rhinacanthin B(2)、rhinacanthin C(3)、rhinacanthin D(4)、rhinacanthin E(5)、rhinacanthin M(6)、rhinacanthin N(7)、rhinacanthin Q(8)、rhinacanthin T(9)、rhinacanthone(10)、β-谷甾醇(11)、没食子酸(12)、香草酸(13)、丁香酸(14)、拉帕醇(15)、伞形花内酯(16)、sambucunlin A(17)、17α,21-dihydroxy-1,4-pregnadiene-3,11,20-trione,21-acetate(18)、1,8-二羟基蒽醌(19)、2,6-二甲氧基-1,4-苯醌(20)。化合物3、7抑制HepG2、Hela、A549、H22肿瘤细胞增殖的IC_(50)值为(0.66±0.17)~(3.22±0.49)μmol/L,且呈时间和浓度依赖性;化合物3、7、9对油酸诱导的HepG2高脂细胞脂质的清除率高达50%以上。结论化合物16~20为首次从该植物中分离得到。化合物3、7具有良好的体外抗肿瘤活性,3、7、9具有较好的体外降脂活性。

关键词：白鹤灵芝化学成分分离鉴定抗肿瘤降脂

亚甲基四氢叶酸脱氢酶2是异质性细胞叠套结构形成的负调控分子

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中国生物化学与分子生物学报 2024年第6期40卷 819-826页

作者：冯鹏飞刘辰瑜黄一诺孙卓然张揚易黄红艳王晨曦王小宁解放军医学院研究生院北京100853 解放军总医院第二医学中心老年医学研究所衰老与相关疾病研究北京市重点实验室国家老年疾病临床医学研究中心北京100853 军事医学研究院生物工程研究所北京100071 首都医科大学附属北京世纪坛医院肿瘤治疗性疫苗北京市重点实验室北京100038

异质性细胞叠套结构(heterotypic cell-in-cell structure,heCICs)介导独特的非自主性细胞死亡,广泛参与肿瘤发生、发展和临床预后等多种重要的病理学过程。亚甲基四氢叶酸脱氢酶2(methylenetetrahydrofolata dehydrogenase 2,MTHFD2)作为一碳代谢的关键酶之一,在多种肿瘤细胞中高表达。在本研究中,为了探究MTHFD2对heCICs形成能力的影响,首先应用活细胞染料对肝癌细胞和免疫细胞分别进行标记,利用荧光显微镜对细胞进行拍摄分析建立heCICs模型。进一步通过RNAi技术瞬时敲低细胞中的MTHFD 2,结果显示,MTHFD 2敲低后,PLC/PRF/5和Hep3B分别与免疫细胞形成heCICs的能力显著升高(均P<0.01)。通过同源重组方法构建MTHFD2重组表达质粒,进一步构建MTHFD2过表达细胞系;将过表达细胞系与免疫细胞共培养检测MTHFD2过表达对heCICs形成能力的影响,结果显示,过表达MTHFD2后heCICs形成率显著降低(均P<0.001)。综上,本研究表明,MTHFD2是heCICs形成的负调控因子,为靶向MTHFD2促进heCICs形成增强免疫细胞胞内杀伤提供了研究基础。

关键词：亚甲基四氢叶酸脱氢酶2 异质性细胞叠套结构肝癌免疫治疗

Entanglement Dynamics of Two-Qubit System in Different Types of Noisy Channels

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Communications in Theoretical Physics 2009年第6期51卷 1013-1016页

作者： SHAN Chuan-Jia LIU Ji-Bing CHENG Wei-Wen LIU Tang-Kun huang yan-Xia LI hong College of Physics and Electronic Science Hubei Normal University Huangshi 4350（}2 China

In this paper, we study entanglement dynamics of a two-qubit extended Werner-like state locally, interacting with independent noisy channels, i.e., amplitude damping, phase damping, and depolarizing channels. We show that the purity of initial entangled state has direct impacts on the entanglement robustness in each noisy channel. That is, if the initial entangled state is prepared in mixed instead of pure form, the state may exhibit entanglement sudden death （ESD） and/or be decreased for the critical probability at which the entanglement disappear.

关键词： entanglement dynamics entanglement sudden death purity

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产愈创木酚菌株筛选及其在酱油酿造中的应用

中国调味品 2024年第2期49卷 42-48,61页

作者：张颖超于鑫赵祥颖刘丽萍王新文黄艳红刘建军齐鲁工业大学(山东省科学院)山东省食品发酵工业研究设计院济南250013 齐鲁工业大学(山东省科学院)食品科学与工程学院济南250013 山东玉兔食品股份有限公司山东淄博255300

从日式高盐稀态发酵酱油酱醪中分离获得一株能转化阿魏酸(ferulic acid,FA)生成4-乙烯基愈创木酚(4-vinylguaiacol,4-VG)和4-乙基愈创木酚(4-ethylguaiacol,4-EG)的酵母菌株JLY60-1,通过ITS rDNA测序和同源序列检索分析鉴定为Wickerhamiella versatilis,其最适生长温度为30℃,在20%盐浓度下培养15 d,发酵液中的4-EG浓度最高,达13.6 mg/L。在传统酱油酿造过程中强化菌株JLY60-1,采用高效液相色谱法和离子迁移色谱法测定不同发酵酱醪中酚酸及挥发性风味组分的含量,结果表明,菌株JLY60-1可以高效转化酱醪中的FA生成4-VG和4-EG,发酵30 d的酱油中4-VG和4-EG含量分别达到16.5,30.5 mg/L,对照组含量分别为1.83,3.03 mg/L。同时,强化菌株JLY60-1还提高了酱油中醛类、酮类芳香化合物的含量,丰富了酱油香气,对改善和提升酱油品质具有重要实用价值。

关键词：酱油阿魏酸 4-乙基愈创木酚 4-乙烯基愈创木酚 Wickerhamiella versatilis

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红曲霉菌的筛选及其在液态食醋酿造中的应用

中国调味品 2024年第1期49卷 33-39页

作者：杜琳琳赵祥颖刘丽萍黄艳红王新文李梦真刘建军齐鲁工业大学(山东省科学院)山东省食品发酵工业研究设计院济南250013 齐鲁工业大学(山东省科学院)食品科学与工程学院济南250013 山东玉兔食品股份有限公司山东淄博255300

以大米糖化能力为指标,从红曲米醋传统发酵剂乌衣红曲中分离获得一株红曲霉ZSM1,研究优化了其液态培养产酶条件和酶特性。以大米为主要原料,酒精发酵采用酿酒酵母SFH-JM12,研究了以红曲霉ZSM1发酵液作为糖化剂对液态米醋风味品质的影响... 详细信息

以大米糖化能力为指标,从红曲米醋传统发酵剂乌衣红曲中分离获得一株红曲霉ZSM1,研究优化了其液态培养产酶条件和酶特性。以大米为主要原料,酒精发酵采用酿酒酵母SFH-JM12,研究了以红曲霉ZSM1发酵液作为糖化剂对液态米醋风味品质的影响,以传统液态米醋酿造糖化剂为对照组,研究比较了发酵米醋中游离氨基酸、有机酸、风味化合物等组成与含量,并进行了感官品评。结果表明,以红曲霉ZSM1作为糖化剂,提高了产品中有机酸含量,乳酸含量达到1.11 g/dL,琥珀酸含量达到1.81 g/dL;具有鲜味的谷氨酸含量显著提高,浓度最高达115.97 mg/g,比对照组提高了16.45倍。甜味氨基酸如丝氨酸含量由4.23 mg/g增加到140.17 mg/g,苏氨酸含量由37.98 mg/g增加到382.34 mg/g;显著提高了产品中甲酸-2-甲基丁酯、乙酸丙酯、2,3-戊二酮等芳香化合物的含量,且产品酸而不涩,刺激性气味显著减弱,香气浓郁,具有典型的醋香,红曲霉ZSM1菌株的应用改善提升了液态米醋的风味品质。

关键词：红曲霉乌衣红曲米醋风味物质

Research on Bast Fiber Extracted from the White Bark of Three Species in the Genus Broussonetia

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Chinese Journal of Polymer Science 2024年第6期42卷 729-738页

作者： Shan-Shan Jin Si-Nong Wang yan-yan huang Jing-Yu Zhang Peng Liu Hui Yu hong-Dong Zhang Yu-Liang yang Institute for Preservation and Conservation of Chinese Ancient Books Fudan University LibraryFudan UniversityShanghai200433China State key laboratory of Molecular Engineering of polymers Department of Macromolecular ScienceFudan UniversityShanghai200433China

Against the backdrop of a global paper resource shortage,there is a growing need to identify fast-growing tree species capable of producing long-lasting *** plant species namely Broussonetia kazinoki,Broussonetia papyrifera and hybrid paper mulberry,belong to the Broussonetia genus,were collected from China to study their white bark suitability for pulp and *** chemical composition revealed that the holocellulose content in Broussonetia kazinoki and Broussonetia papyrifera was more than 80%.The molecular weight distribution of several holocellulose/α-cellulose is observed by GPC,which allows us to better observe the changes of various components on the molecular *** yield,lignin,whiteness,and molecular weight of the pulps obtained by NaOH treatment were *** microscope was used to characterize the fiber length-width ratio and ***,the improvement of the fiber rigidity method based on the Kratky-Porod chain model makes it more theoretical and further reveals the influencing factors of fiber *** study demonstrates the high potentiality of these three species for papermaking applications.

关键词： Broussonetia genus Cellulose Alkaline pulping Kratky-Porod chain model Fiber rigidity

Evaluation and application of kinetic models for Cu-catalyzed acetylene hydrochlorination

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Chinese Journal of Chemical Engineering 2024年第8期72卷 209-219页

作者： Tianxiao huang Binhang yan Department of Chemical Engineering Tsinghua UniversityBeijing 100084China

The development of environmentally friendly catalysts has become a top priority for acetylene ***,difficulties remain in systematic studies on the applicability of kinetic models for the industrialization of Cu-based ***,a strategy involving reactor modeling,parameter estimation,and model testing is developed to evaluate the predictive ability of kinetic *** order to search for reliable and widely applicable reaction kinetic models for Cu-based catalysts,a case study is *** possible kinetic models derived from the power law,adsorption mechanism,and reaction path are sifted through collecting and testing activity data from tens of Cu-based *** optimum applicable ranges of these kinetic models are *** to the comparative analysis on their applications in various industrial scenarios,this research suggests that kinetic models derived from reaction path exhibits the best extrapolation ability and has the greatest potential for application in the scale-up design of reactors.

关键词： Acetylene hydrochlorination Cu-based catalysts Reaction kinetics Model Reactors

A wide-linear-range and low-hysteresis resistive strain sensor made of double-threaded conductive yarn for human movement detection

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Journal of Materials Science & Technology 2024年第5期172卷 202-212页

作者： Fei huang Jiyong Hu Xiong yan Shanghai Frontier Science Research Center for Modern Textiles Donghua UniversityShanghai 201620China

Yarn-based flexible strain sensors with advantages in wearability and integrability have attracted wide ***,it is still a big challenge to achieve yarn-based strain sensors with a wide linear strain range,low hysteresis,and durability synchronously that can be used for full range detection of human body ***,a new structure,double-threaded conductive yarn with rhythmic strain distribu-tion,is reported to markedly widen the linear strain range of microcrack-based stretchable strain sensors.A new method of winding and thermally adhering hot-melt filaments on the surface of the elastic fiber is used to achieve double-threaded yarn(DTY)with rhythmic strain *** proposed strategy,the integration of heterogeneous materials,is reported to significantly reduce the mechanical hysteresis of composite *** strain distribution of the DTY during stretching causes multi-level micro-cracks in different regions of the carbon nanotube(CNT)conductive layer deposited on the surface of the ***,the sensing performance of DTY-based strain sensor can be adjusted by designing the structural *** final prepared flexible strain sensor has the advantages of a wide linear strain range(100%),great sensitivity(GF=12.43),low hysteresis,rapid response(158 ms),high repeatability(>2000 cycles at 50%strain),and hydrophobicity,*** sensor can monitor human motion repeatedly and stably well,and shows great advantages in flexible wearable devices.

关键词： Double-threaded yarn Strain redistribution Hysteresis Human motion monitoring

Systematic analysis and modeling of the FLASH sparing effect as a function of dose and dose rate

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NUCLEAR SCIENCE AND TECHNIQUES 2024年第10期35卷 1-8页

作者： Fu, Qi-Bin Zhang, yan Wang, Yu-Cheng huang, Tu-Chen Zhu, hong-Yu Deng, Xiao-Wu Sun Yat Sen Univ Sino French Inst Nucl Engn & Technol Zhuhai 519082 Peoples R China Sun Yat Sen Univ Collaborat Innovat Ctr Canc Med Dept Radiat Oncol State Key Lab Oncol South ChinaCanc Ctr Guangzhou 510060 Peoples R China

Ultrahigh-dose-rate radiotherapy (FLASH-RT) is a revolutionary radiotherapy technology that can spare normal tissues without compromising tumor control. Although qualitative experimental results have been reported, quantitative and systematic analysis of data is necessary. Particularly, the FLASH effect response model to the dose or dose rate is still unclear. This study investigated the relationships between the FLASH effect and experimental parameters, such as dose, dose rate, and other factors by analyzing published in vivo experimental data from animal models. The data were modeled based on logistic regression analysis using the sigmoid function. The model was evaluated using prediction accuracy, receiver operating characteristic (ROC) curve, and area under the ROC curve. Results showed that the FLASH effect was closely related to the dose, mean dose rate, tissue type, and corresponding biological endpoints. The dose rate corresponding to a 50% probability of triggering cognitive protection in the brain was 45 Gy s-1\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${-1}$$\end{document}. The dose rate corresponding to a 50% probability of triggering intestinal crypt survival and regeneration was 140 Gy s-1\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${-1}$$\end{document}. For the skin toxicity effect, the dose corresponding to a 50% probability of triggering the FLASH effect was 24 Gy. This study helps to characterize the conditions underlying the FLASH effect and provides important information for optimizing experiments.

关键词： FLASH radiotherapy Sparing effect Systematic analysis Dose rate Dose Biological endpoints IRRADIATION DESIGN