检索结果-南通市图书馆

Germplasm resources of three wood plant species enriched with nervonic acid

Plant Diversity 2022年第3期44卷 308-315页

作者： Xing He Tian-Quan Lu Jiang-Ying Li Ping Mao Li Zhang guo-wei zheng Bo Tian Key Laboratory of Sustainable Utilization of Tropical Plant Resources Xishuangbanna Tropical Botanical GardenChinese Academy of Sciences88 Xuefu RoadKunming650223China University of Chinese Academy of Sciences Beijing100049China Xinping Branch Yuxi Tobacco CompanyXinping653400China d Guangnan Forestry and Grassland Bureau Guangnan663300China Traditional Chinese Medicine College Yunnan University of Chinese MedicineKunming650500China Center of Economic Botany Core Botanical GardensChinese Academy of SciencesMenglunMenglaYunnan666303China

Nervonic acid(NA)is a very-long-chain monounsaturated fatty acid with pharmaceutical and nutraceutical functions that plays an important role in treating several neurological disorders.One major source of NA is plant seed oil.Here we report fatty acid profiles of seeds and germplasm diversity of six plant species,including three woody plants with high amounts of NA-enriched seed oil,Malania oleifera,Macaranga adenantha,and M.indica.M.oleifera had the largest seed(average 7.40 g single seed),highest oil content(58.71%),and highest NA level(42.22%).The germplasm diversity of M.oleifera is associated with its habitat but not elevation.Seeds of M.adenantha contained higher NA levels(28.41%)than M.indica(21.77%),but M.indica contained a significantly higher oil content(29.22%)and seed yield.M.adenantha germplasm varied among populations,with one population having seeds with high oil content(22.63%)and NA level(37.78%).Although M.indica grow naturally at a range of elevations,no significant differences were detected between M.indica populations.These results suggest that M.indica and M.oleifera have greater potential as a source of NA,which will contribute to constructing a germplasm resource nursery and establishing a selection and breeding program to improve the development of NA-enriched plants.

关键词： Nervonic acid Germplasm resource Malania oleifera Macaranga adenantha Macaranga indica Diversity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

UHPC全包裹S690高强型钢短柱轴压性能研究

引用

武汉理工大学学报 2024年第3期46卷 63-69页

作者：魏国正王振亥李涛武汉理工大学土木工程与建筑学院武汉430070

以高强型钢超高性能混凝土短柱(型钢强度为S690,UHPC强度为C130)的轴压试验为基础,利用有限元软件对试件进行了非线性有限元分析,有限元分析结果和试验荷载-位移曲线吻合较好,破坏模态相同,峰值荷载偏差值为8.9%,有限元模拟型钢荷载-竖... 详细信息

以高强型钢超高性能混凝土短柱(型钢强度为S690,UHPC强度为C130)的轴压试验为基础,利用有限元软件对试件进行了非线性有限元分析,有限元分析结果和试验荷载-位移曲线吻合较好,破坏模态相同,峰值荷载偏差值为8.9%,有限元模拟型钢荷载-竖直应变曲线和荷载-水平应变的峰值应变偏差为4.3%,验证了建模方法的可靠性,表明该有限元模型可以准确预测其轴压性能。基于试验和数值模拟分析了试件的受力机理。最后利用该有限元模型探究了箍筋间距参数、混凝土保护层内布置钢丝网参数对轴压性能的影响。结果表明:箍筋间距增加,试件轴压峰值承载能力变化不大,剩余承载能力减小;设置钢丝网以后,试件的峰值承载能力和剩余承载能力提高。

关键词：超高性能混凝土型钢混凝土组合短柱轴压性能非线性有限元分析

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

天然气净化厂噪声特征分析及降噪方法研究

引用

石油化工设备 2024年第3期53卷 5-11页

作者：董超群廖平刘念黄成于刘建勋谢帅郭正伟任连城重庆科技大学机械与动力工程学院重庆401331 重庆科技大学石油天然气装备研究院重庆401331 中石油西南油气田分公司地面重点项目部四川成都610051

某天然气净化厂日常生产噪声加权声压级超过GB 12348—2008《工业企业厂界环境噪声排放标准》中3类声功能环境区噪声环境限值,对该厂主要噪声源进行识别和现场声压级监测,分析确定主要噪声源设备及其噪声频谱特征。简化天然气净化厂噪声... 详细信息

某天然气净化厂日常生产噪声加权声压级超过GB 12348—2008《工业企业厂界环境噪声排放标准》中3类声功能环境区噪声环境限值,对该厂主要噪声源进行识别和现场声压级监测,分析确定主要噪声源设备及其噪声频谱特征。简化天然气净化厂噪声源,应用声音传播理论设计和计算降噪声屏障结构,采用噪声控制分析软件模拟验证降噪效果。经验证,所用下部砖墙+上部彩钢吸声板组合结构声屏障能够将净化厂噪声控制在55 dB(A)以下,达到噪声排放国家标准要求。

关键词：天然气净化噪声污染治理

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Nanomedicine Disrupts Stromal Barriers to Augment Drug Penetration for Improved Cancer Therapy

引用

Chinese Journal of Chemistry 2024年第10期42卷 1175-1189页

作者： guo-Feng Luo wei-Hai Chen Xian-zheng Zhang state Key Laboratory of Oral&Maxillofacial Reconstruction and Regeneration Key Laboratory of Oral Biomedicine Ministry of EducationHubei KeyLaboratory of StomatologySchool&Hospital of StomatologyWuhan UniversityWuhanHubei 430079China Key Laboratoryof Biomedical Polymers of Ministry of Education&Departmentof Chemistry Wuhan UniversityWuhanHubei 430072China

Tumor stroma composing diverse extracellular matrixes(ECM)and stromal cells shapes a condensed physical barrier,which severely hampers the efficient accessibility of nanomedicine to tumor cells,especially these deep-seated in the core of tumor.Such barrier significantly compromises the antitumor effects of drug-loaded nanomedicine,revealing the remarkable importance of disrupting stromal barrier for improved tumor therapy with deep penetration ability.To achieve this goal,various nanoparticle-based strategies have been developed,including direct depleting ECM components via delivering anti-fibrotic agents or targeting stromal cells to suppress ECM expression,dynamic regulation of nanoparticles’physicochemical properties(i.e.,size,surface charge,and morphology),mechanical force-driven deep penetration,natural/biomimetic self-driven nanomedicine,and transcytosis-inducing nanomedicine.All these nanostrategies were systemically summarized in this review,and the design principles for obtaining admirable nanomedicine were included.With the rapid development of nanotechnology,elaborate design of multifunctional nanomedicine provides new opportunities for overcoming the critical stromal barriers to maximize the therapeutic index of various therapies,such as chemotherapy,photodynamic therapy,and immunotherapy.

关键词： Nanomedicine Tumor stroma Deep penetration Enhanced drug perfusion Cancer therapy Drug carriers Biomaterials Nanotechnology

来源：

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

On-surface synthesis and characterization of polyynic carbon chains

引用

National Science Review 2024年第3期11卷 192-199页

作者： Wenze Gao wei zheng Luye Sun Faming Kang zheng Zhou wei Xu Interdisciplinary Materials Research Center School of Materials Science and Engineering Tongji University

Carbyne, an elusive sp-hybridized linear carbon allotrope, has fascinated chemists and physicists for decades. Due to its high chemical reactivity and extreme instability, carbyne was much less explored in contrast to the sp2-hybridized carbon allotropes such as graphene. Herein, we report the on-surface synthesis of polyynic carbon chains by demetallization of organometallic polyynes on the Au（111） surface;the longest one observed consists of ～60 alkyne units（120 carbon atoms）. The polyynic structure of carbon chains with alternating triple and single bonds was unambiguously revealed by bond-resolved atomic force microscopy. Moreover, an atomically precise polyyne, C14, was successfully produced via tip-induced dehalogenation and ring-opening of the decachloroanthracene molecule(C14Cl10) on a bilayer NaCl/Au（111） surface at 4.7 K, and a band gap of 5.8 eV was measured by scanning tunnelling spectroscopy,in a good agreement with the theoretical HOMO–LUMO gap（5.48 eV）.

关键词： polyyne scanning probe microscopy carbon allotrope on-surface synthesis organometallic polyyne

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Insertion sequence transposition activates antimycobacteriophage immunity through an Isr2-silenced lipid metabolism gene island

引用

mLife 2024年第1期3卷 87-100页

作者： Yakun Li Yuyun wei Xiao guo Xiaohui Li Lining Lu Lihua Hu zheng-guo He State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources Guangxi Research Center for Microbial and Enzyme Engineering TechnologyCollege of Life Scienceand TechnologyGuangxi UniversityNanningChina

Insertion sequences(ISs)exist widely in bacterial genomes,but their roles in the evolution of bacterial antiphage defense remain to be clarified.Here,we report that,under the pressure of phage infection,the IS1o96 transposition of Mycobacterium smegmatis into the Isr2 gene can occur at high frequencies,which endows the mutant mycobacterium with a broad-spectrum antiphage ability.Lsr2 functions as a negative regulator and directly silences expression of a gene island composed of 11 lipid metabolism-related genes.The complete or partial loss of the gene island leads to a significant decrease of bacteriophage adsorption to the mycobacterium,thus defending against phage infection.Strikingly,a phage that has evolved mutations in two tail-filament genes can re-escape from the Isr2 inactivation-triggered host defense.This study uncovered a new signaling pathway for activating antimycobacteriophage immunity by Is transposition and provided insight into the natural evolution of bacterial antiphage defense.

关键词： antiphage defense bacteriophage gene island insertion sequence mycobacteria

来源：

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

Macroscopic polarization enhancement boosting piezo-photocatalytic performance via Nb-doping on B-site of Bi_(4)Ti_(3)O_(12)nanosheets

引用

Journal of Advanced Ceramics 2024年第4期13卷 437-446页

作者： Hongjian Yu Xindong wei Min Wang Yan Zhang zheng Wu Fan guo Jie Han School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid WastesNational Laboratory of Mineral MaterialsSchool of Material Sciences and TechnologyChina University of Geosciences(Beijing)Beijing 100083China School of Environmental and Chemical Engineering Xi’an Key Laboratory of Textile Chemical Engineering AuxiliariesXi'an Polytechnic UniversityXi'an 710048China

The development of a high-performance ferroelectric piezo-photocatalyst is an efficient strategy for advancing sustainability within the environmental and energy sectors.Yet,a major challenge lies in the creation of a strong polarized electric field that can effectively hinder charge recombination,both within the bulk and on the surface of catalysts.Herein,we synthesize a series of Nb-doped Bi_(4)Ti_(3)O_(12)nanosheets via a facile one-pot hydrothermal method to achieve synergistically enhanced piezo-photocatalytic performance in CO_(2)reduction and pollutant degradation.The optimized doped Bi_(4)Ti_(3)O_(12)demonstrates remarkable efficiency in the conversion of CO_(2)into CO,with a high production rate of 72.7μmol∙g−1∙h−1 without using co-catalysts or any sacrificial agent,surpassing the performance of unmodified Bi_(4)Ti_(3)O_(12)by up to 4.69 folds.Additionally,our catalyst demonstrates ultra-fast piezo-photocatalytic degradation of organic pollutant Rhodamine B(RhB)at low concentrations and exceptional piezo-photocatalytic activity at high concentrations,outperforming most previously reported state-of-the-art catalysts.The systematic corroboration of catalyst characterization and experimental analysis reveals that the synergistic effect arises from the amplified macroscopic polarization induced by lattice distortion caused by the larger Nb ions,thereby improving piezo-photocatalytic efficiency.This research thus offers valuable insights into the direct design and fabrication of versatile catalytic systems,with applications spanning CO_(2)valorization and beyond.

关键词： CO_(2)reduction dye degradation piezo-photocatalysis Nb-doped Bi_(4)Ti_(3)O_(12) macroscopic polarization regulation

来源：

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

High-Order Decoupled and Bound Preserving Local Discontinuous Galerkin Methods for a Class of Chemotaxis Models

引用

Communications on Applied Mathematics and Computation 2024年第1期6卷 372-398页

作者： wei zheng Yan Xu School of Mathematical Sciences University of Science and Technology of ChinaHefei230026AnhuiChina

In this paper,we explore bound preserving and high-order accurate local discontinuous Galerkin(LDG)schemes to solve a class of chemotaxis models,including the classical Keller-Segel(KS)model and two other density-dependent problems.We use the convex splitting method,the variant energy quadratization method,and the scalar auxiliary variable method coupled with the LDG method to construct first-order temporal accurate schemes based on the gradient flow structure of the models.These semi-implicit schemes are decoupled,energy stable,and can be extended to high accuracy schemes using the semi-implicit spectral deferred correction method.Many bound preserving DG discretizations are only worked on explicit time integration methods and are difficult to get high-order accuracy.To overcome these difficulties,we use the Lagrange multipliers to enforce the implicit or semi-implicit LDG schemes to satisfy the bound constraints at each time step.This bound preserving limiter results in the Karush-Kuhn-Tucker condition,which can be solved by an efficient active set semi-smooth Newton method.Various numerical experiments illustrate the high-order accuracy and the effect of bound preserving.

关键词： Chemotaxis models Local discontinuous Galerkin(LDG)scheme Convex splitting method Variant energy quadratization method Scalar auxiliary variable method Spectral deferred correction method

来源：

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

MiR-30a-5p alleviates LPS-induced HPMEC injury through regulation of autophagy via Beclin-1

引用

BIOCELL 2024年第3期48卷 431-441页

作者： RAN PAN JIAYAN MAO YUELIANG zheng wei CHEN JUNPING guo LIJUN WANG Rainbowfish Rehabilitation and Nursing School Hangzhou Vocational&Technical CollegeHangzhou310018China Cancer Institute of Integrated Traditional Chinese and Western Medicine Key Laboratory of Cancer Prevention and Therapy Combining Traditional Chinese and Western MedicineZhejiang Academy of Traditional Chinese MedicineHangzhou310012China Geriatric Medicine Center Department of EndocrinologyZhejiang Provincial People’s Hospital(Affiliated People’s Hospital)Hangzhou Medical CollegeHangzhou310015China

Background:Sepsis,a type of systemic disease,can impact nearly all organs,tissues and cells.Among them,endothelial cells are amongst theﬁrst to be affected and respond to the insult.In this study,we investigated the protective effects of microRNA-30a-5p(miR-30a-5p)on human pulmonary microvascular endothelial cells(HPMECs)treated with lipolysaccharide(LPS).Methods:An in vitro model of sepsis was established in HPMECs with the use of LPS.Transfecting with different tools(mimetic and inhibitor)to modify miR-30a-5p expression.Cell viability,proliferation and apoptosis were detected by the CCK-8 assay,the EdU kit andﬂuorescence staining,respectively.The autophagy-related protein and mRNA expression,the number of autophagosomes were separately examined through Western blot analysis,qPT-PCR and confocal microscopy.TargetScan and the luciferase reporter assays were used to probe target genes interacting with miR-30a-5p.Results:LPS caused a reduction in the viability and proliferation of HPMECs,as well as an elevation in the number of apoptotic cells.Subsequently,we observed that miR-30a-5p might play a role in preventing LPS-induced inhibition of cell damage and decreasing HPMEC apoptosis,suggesting the potential function of miR-30a-5p in this injury process.Finally,we conﬁrmed that miR-30a-5p exerts its protective effect by regulating cell autophagy,possibly by targeting Beclin-1.Conclusion:Our study provided evidence that autophagy is a crucial aspect in the protective role of miR-30a-5p against LPS-induced HPMEC injury,identifying a promising target for sepsis-related endothelial cell injury.

关键词： Sepsis Endothelial cells MicroRNA Systemic inflammatory response syndrome

来源：

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

Accurately tracking hypersonic gliding vehicles via an LEO mega-constellation in relay tracking mode

引用

Journal of Systems Engineering and Electronics 2024年第1期35卷 211-221页

作者： LI Zhao WANG Yidi zheng wei College of Aerospace Science and Engineering National University of Defense TechnologyChangsha 410073China

In order to effectively defend against the threats of the hypersonic gliding vehicles(HGVs),HGVs should be tracked as early as possible,which is beyond the capability of the ground-based radars.Being benefited by the developing megaconstellations in low-Earth orbit,this paper proposes a relay tracking mode to track HGVs to overcome the above problem.The whole tracking mission is composed of several tracking intervals with the same duration.Within each tracking interval,several appropriate satellites are dispatched to track the HGV.Satellites that are planned to take part in the tracking mission are selected by a new derived observability criterion.The tracking performances of the proposed tracking mode and the other two traditional tracking modes,including the stare and track-rate modes,are compared by simulation.The results show that the relay tracking mode can track the whole trajectory of a HGV,while the stare mode can only provide a very short tracking arc.Moreover,the relay tracking mode achieve higher tracking accuracy with fewer attitude controls than the track-rate mode.

关键词： target tracking mega-constellation hypersonic gliding vehicle(HGV) sensor selection observability analysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：