检索结果-南通市图书馆

Interactions of the indigenous evergreen shrub Sabina vulgariswith coexisting species in the Mu Us sandland

Journal of Plant Ecology 2013年第1期6卷 48-56页

作者： Lei Ning chun-xiang liu Wei-Ming He Fei-Hai Yu College of Nature Conservation Beijing Forestry UniversityBeijing 100083China State Key Lab of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China Graduate University of Chinese Academy of Sciences Beijing 100039China

Aims Facilitation is widespread in plant communities and particularly common in highly stressful *** the semi-arid Mu Us sandland where soil water and nutrients are short and grazing is heavy,many species grow within the large patches formed by the dense individuals of the unpalatable clonal shrub Sabina vulgaris,the only natural evergreen shrub species in the Mu Us ***,the interactions between *** and these coexisting species remain unclear,and we hypothesize that *** can facilitate at least some species because within the patches vegetation is not grazed and soil water and nutrients may also be *** We measured the maximum height,coverage and number of individuals of each vascular species,little cover and thickness of biological crust at the soil surface in 1 m×1 m plots in three types of microsites associated with 40 patches of ***:(i)at the center,(ii)at the inner edge and(iii)outside the *** also took soil samples and measured soil water content and content of total N,P,K and organic *** Findings Soil water,nitrogen,organic matter and litter cover were the highest at the patch center,lowest outside the patches and intermediate at the inner edge of the patches,whereas thickness of biological crust was greater outside than at the center or at the inner *** the 32 species recorded,six species preferred to occur within the patches,suggesting that *** can facilitate these species most likely by grazing exclusion,increasing water and/or nitrogen resources in ***,most(19)species did not show preference and seven preferred ***,species richness,pooled cover and number of individuals of all species were greater outside than within the patches,and such effects did not vary with the size of the *** *** results suggest that the dominant interactions between *** and the coexisting species are *** findings add to our knowledge that fa

关键词： competition facilitation facilitative effects island of fertility plant-plant interactions resource islands semi-arid land

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

Modification mechanism of caking and coking properties of Shenmu subbituminous coal by low-temperature rapid pyrolysis treatment

引用

Journal of Iron and Steel Research International 2019年第10期26卷 1052-1060页

作者： xiang-chun liu Bin Fang Zhi-gang Zhao Rui-lun Xie Zhao Lei Qiang Ling Ping Cui Anhui Key Laboratory of Coal Clean Conversion&Utilization School of Chemistry and Chemical EngineeringAnhui University of TechnologyMa'anshan 243032AnhuiChina

Shenmu(SM)subbituminous coal without caking property was treated by low-temperature rapid pyrolysis(LTRP)to modify its caking and coking *** treated samples were characterized by Fourier transform infrared spectrometry,vitrinite reflectance,and X-ray diffraction to determine the modification ***,caking index(G)and coking indices(mechanical strength,coke reactivity,and coke strength after reaction)were employed to evaluate caking and coking properties,*** results showed that SM coal was gradually upgraded with increasing processing ***,the G values for the treated samples were significantly higher than that for SM coal,and G reached the maximum value at 450℃,implying the modification of caking property and the existence of an optimum temperature(450℃).Additionally,laboratory coking determinations showed that LTRP increased the mechanical strength of coke and coke strength after reaction and decreased coke reactivity when the treated coals were used in the coal blends instead of raw SM ***,LTRP treatment is effective to improve the caking and coking properties of SM coal.A mechanism was proposed for the *** upgrading degree with suitable molecular masses and some releasable hydrogen-rich donor species present within the coal,which dominate the development of caking property,is important.

关键词： Caking property Coking property Non-caking coal Low-temperature rapid pyrolysis Subbituminous coal

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

Adaptive plasticity in response to light and nutrient availability in the clonal plant Duchesnea indica

引用

Journal of Plant Ecology 2022年第4期15卷 795-807页

作者： Mo-Zhu Wang Hong-Li Li chun-xiang liu Bi-Cheng Dong Fei-Hai Yu Institute of Wetland Ecology&Clone Ecology Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and ConservationTaizhou UniversityTaizhou 318000China School of Ecology and Nature Conservation Beijing Forestry UniversityBeijing 100083China State Key Laboratory of Systematic and Evolutionary Botany Institute of BotanyChinese Academy of SciencesBeijing 100093China

Phenotypic plasticity enables plants to buffer against environmental stresses and match their phenotypes to local ***,consistent conclusive evidence for adaptive plasticity has only been obtained for a few *** studies on a wider variety of plant functional traits and environmental factors are still needed to further understand the adaptive significance of *** grew 21 genotypes of the stoloniferous clonal plant Duchesnea indica under different light and nutrient conditions,and used selection gradient analyses to test the adaptive value(benefits)of morphological and physiological plasticity responding to variation in light and nutrient *** grown in shade exhibited lower values for fitness measures(fruit number,ramet number and biomass),shortened thinner internode length and decreased adult leaf chlorophyll content,but higher petiole length,specific leaf area and old leaf chlorophyll content,than plants grown without *** grown in the low nutrient condition had shorter petiole length,thicker and smaller leaf area,lower chlorophyll content,but higher fruit number and root:shoot ratio than plants grown under the high nutrient *** gradient analyses revealed that plasticity of petiole length and old leaf chlorophyll content in response to light variation was adaptive,and plasticity of old and adult leaf chlorophyll content in response to nutrient variation was ***,the adaptive value of plasticity in different traits depends on the specific ecological *** findings contribute to understanding the adaptive significance of phenotypic plasticity of clonal plants in response to environmental variation.

关键词： adaptive plasticity clonal plants Duchesnea indica stoloniferous plant phenotypes

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

Investigation of bubbles escape behavior from low basicity mold flux for high-Mn high-Al steels using 3D X-ray microscope

引用

International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 102-110页

作者： Qiang liu xiang Li Shen Du Ming Gao Yanbin Yin Jiongming Zhang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

During the continuous casting process of high-Mn high-Al steels,various types of gases such as Ar need to escape through the top of the *** which,the behavior of bubbles traversing the liquid slag serves as a restrictive link,closely associated with viscosity and the thickness of liquid *** contrast to two-dimensional surface observation,three-dimensional(3D)analysis method can offer a more intuitive,accurate,and comprehensive ***,this study employs a 3D X-ray microscope(3D-XRM)to obtained spatial distribution and 3D morphological characteristics of residual bubbles in mold flux under different basicity of liquid slag,different temperatures,and different holding *** results indicate that as basicity of slag increases from 0.52 to 1.03,temperature increases from 1423 to 1573 K,the viscosity of slag decreases,the floating rate of bubbles *** addition,when holding time increases from 10 to 30 s,the bubbles floating distance increases,and the volume fraction and average equivalent sphere diameter of the bubbles solidified in the mold flux gradually *** one word,increasing the basicity,temperature,and holding time leading to an increase in the removal rate of bubbles especially for the *** findings of bubbles escape behavior provide valuable insights into optimizing low basicity mold flux for high-Mn high-Al steels.

关键词： mold flux low basicity bubbles three-dimensional X-ray microscope viscosity

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

Comparative proteomic analysis of plasma exosomes reveals the functional contribution of N-acetyl-alpha-glucosaminidase to Parkinson’s disease

引用

Neural Regeneration Research 2025年第10期20卷 2998-3012页

作者： Yuan Zhao Yidan Zhang Xin liu Jian Zhang Ya Gao Shuyue Li Cui Chang xiang liu Guofeng Yang Department of Geriatrics Second Hospital of Hebei Medical UniversityShijiazhuangHebei ProvinceChina Department of Neurosurgery The Second Hospital of Hebei Medical UniversityShijiazhuangHebei ProvinceChina

Parkinson’s disease is the second most common progressive neurodegenerative disorder,and few reliable biomarkers are available to track disease *** proteins,DNA,mRNA,and lipids carried by exosomes reflect intracellular changes,and thus can serve as biomarkers for a variety of *** this study,we investigated alterations in the protein content of plasma exosomes derived from patients with Parkinson’s disease and the potential therapeutic roles of these proteins in Parkinson’s *** a tandem mass tag-based quantitative proteomics approach,we characterized the proteomes of plasma exosomes derived from individual patients,identified exosomal protein signatures specific to patients with Parkinson’s disease,and identified N-acetyl-alpha-glucosaminidase as a differentially expressed protein.N-acetyl-alpha-glucosaminidase expression levels in exosomes from the plasma of patients and healthy controls were validated by enzyme-linked immunosorbent assay and western *** results demonstrated that the exosomal N-acetyl-alpha-glucosaminidase concentration was not only lower in Parkinson’s disease,but also decreased with increasing Hoehn-Yahr stage,suggesting that N-acetyl-alpha-glucosaminidase could be used to rapidly evaluate Parkinson’s disease ***,western blot and immunohistochemistry analysis showed that N-acetyl-alpha-glucosaminidase levels were markedly reduced both in cells treated with 1-methyl-4-phenylpyridinium and cells overexpressingα-synuclein compared with control ***,N-acetyl-alpha-glucosaminidase overexpression significantly increased cell viability and inhibitedα-synuclein expression in 1-methyl-4-phenylpyridinium-treated *** together,our findings demonstrate for the first time that exosomal N-acetyl-alpha-glucosaminidase may serve as a biomarker for Parkinson’s disease diagnosis,and that N-acetyl-alpha-glucosaminidase may reduceα-synuclein expression and 1-methyl-4-phenylpyridinium-induced n

关键词： biomarker diagnosis exosomes N-acetyl-alpha-glucosaminidase Parkinson’s disease proteomic α-synuclein

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

Dispatchable Capability of Aggregated Electric Vehicle Charging in Distribution Systems

引用

Energy Engineering 2025年第1期122卷 129-152页

作者： ShiqianWang Bo liu Yuanpeng Hua Qiuyan Li Binhua Tang Jianshu Zhou Yue xiang Economic and Technology Research Institute State Grid Henan Electric Power CompanyZhengzhou450052China College of Electrical Engineering Sichuan UniversityChengdu610065China

This paper introduces a method for modeling the entire aggregated electric vehicle(EV)charging process and analyzing its dispatchable *** methodology involves developing a model for aggregated EV charging at the charging station level,estimating its physical dispatchable capability,determining its economic dispatchable capability under economic incentives,modeling its participation in the grid,and investigating the effects of different scenarios and EV penetration on the aggregated load dispatch and dispatchable *** results indicate that using economic dispatchable capability reduces charging prices by 9.7%compared to physical dispatchable capability and 9.3%compared to disorderly ***,the peak-to-valley difference is reduced by 64.6%when applying economic dispatchable capability with 20%EV penetration and residential base load,compared to disorderly charging.

关键词： Aggregated charging dispatchable capability peak shaving and valley filling the economics of charging demand response

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

Liposomes as versatile agents for the management of traumatic and nontraumatic central nervous system disorders:drug stability,targeting efficiency,and safety

引用

Neural Regeneration Research 2025年第7期20卷 1883-1899页

作者： Mingyu Zhang chunyu xiang Renrui Niu Xiaodong He Wenqi Luo Wanguo liu Rui Gu Department of Orthopedic Surgery China-Japan Union Hospital of Jilin UniversityChangchunJilin ProvinceChina

Various nanoparticle-based drug delivery systems for the treatment of neurological disorders have been widely ***,their inability to cross the blood–brain barrier hampers the clinical translation of these therapeutic *** are nanoparticles composed of lipid bilayers,which can effectively encapsulate drugs and improve drug delivery across the blood–brain barrier and into brain tissue through their targeting and ***,they can potentially treat traumatic and nontraumatic central nervous system *** this review,we outlined the common properties and preparation methods of liposomes,including thin-film hydration,reverse-phase evaporation,solvent injection techniques,detergent removal methods,and microfluidics ***,we comprehensively discussed the current applications of liposomes in central nervous system diseases,such as Alzheimer's disease,Parkinson's disease,Huntington's disease,amyotrophic lateral sclerosis,traumatic brain injury,spinal cord injury,and brain *** studies related to liposomes are still in the laboratory stage and have not yet entered clinical ***,their application as drug delivery systems in clinical practice faces challenges such as drug stability,targeting efficiency,and ***,we proposed development strategies related to liposomes to further promote their development in neurological disease research.

关键词： Alzheimer's disease amyotrophic lateral sclerosis brain tumors central nervous system Huntington's disease liposome drug delivery neurological disorders Parkinson's disease spinal cord injury traumatic brain injury

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

密码子优化后的αB-晶状体蛋白基因毕赤酵母重组质粒的构建及表达的初步研究

引用

中国生物工程杂志 2017年第7期37卷 42-47页

作者：冯雪高香牛纯青刘堰西南大学生命科学学院重庆400715

αB-晶状体蛋白属于小热休克蛋白家族,具有分子伴侣活性。在阿尔茨海默病大脑中,星形胶质细胞表达的αB-晶状体蛋白明显上调,并且这些上调的αB-晶状体蛋白紧密地分布在β-淀粉样蛋白沉积周围。为了在分子水平上研究胞外αB-晶状体蛋白... 详细信息

αB-晶状体蛋白属于小热休克蛋白家族,具有分子伴侣活性。在阿尔茨海默病大脑中,星形胶质细胞表达的αB-晶状体蛋白明显上调,并且这些上调的αB-晶状体蛋白紧密地分布在β-淀粉样蛋白沉积周围。为了在分子水平上研究胞外αB-晶状体蛋白在阿尔茨海默病中的作用机制,需要获得大量具有生物学活性的αB-晶状体蛋白。根据毕赤酵母密码子偏好性对人αB-晶状体蛋白基因进行优化,并在目的基因3'端加上6个组氨酸标签,优化后的基因克隆到巴斯德毕赤酵母(Pichia pastoris)表达载体p PIC9K上;电转入毕赤酵母GS115中;优化确定最佳表达条件为:BMGY与BMMY的转接比为2∶1,表达时间为72h,甲醇补加终浓度为0.5%;经Western blotting鉴定,获得20kDa的目的蛋白,以及18.6kDa和13.1kDa两个蛋白质片段,重组目的蛋白出现了部分降解,纯化获得20kDa目的蛋白;利用胰岛素还原法测定该片段具有分子伴侣活性,为进一步研究外源αB-晶状体蛋白在阿尔茨海默病中对星形胶质细胞的保护机制奠定基础。

关键词： αB-晶状体蛋白基因巴斯德毕赤酵母密码子优化表达优化分子伴侣活性

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

钻孔裂隙岩体结构均质区划分方法研究

引用

岩土工程学报 2016年第11期38卷 2101-2106页

作者：魏翔杨春和刘鹏君王贵宾陈世万重庆大学煤矿灾害动力学与控制国家重点实验室重庆400044 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室湖北武汉430071 中国地质大学(武汉) 湖北武汉430074

岩体结构均质区是针对实际工程特点而划定的成果,在实践过程中需要根据具体工程,抓住主要矛盾后,选择最具影响性的要素作为划分依据。针对裂隙岩体渗透特征这一问题,提出了以密度分区法和产状分区法相结合的均质区划分方法。密度分区法... 详细信息

岩体结构均质区是针对实际工程特点而划定的成果,在实践过程中需要根据具体工程,抓住主要矛盾后,选择最具影响性的要素作为划分依据。针对裂隙岩体渗透特征这一问题,提出了以密度分区法和产状分区法相结合的均质区划分方法。密度分区法采用重叠窗口对密度绝对差这一指标进行比较来分区;产状分区法首先对列联表中实际频数偏差进行了取样偏差修正,然后利用修正数据对相邻区间进行独立性检验来确定裂隙岩体均质区;采用数学原理对两种分区结果综合考虑获得最终的均质区。将此法应用到钻孔裂隙岩体中,并验证了结果的正确性。

关键词：岩体结构均质区划分方法密度分区法产状分区法

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

Perilipin-2 mediates ferroptosis in oligodendrocyte progenitor cells and myelin injury after ischemic stroke

引用

Neural Regeneration Research 2025年第7期20卷 2015-2028页

作者： Jian Yang Jiang Wu Xueshun Xie Pengfei Xia Jinxin Lu Jiale liu Lei Bai xiang Li Zhengquan Yu Haiying Li Department of Neurosurgery&Brain and Nerve Research Laboratory The First Affiliated Hospital of Soochow UniversitySuzhouJiangsu ProvinceChina Institute of Stroke Research Soochow UniversitySuzhouJiangsu ProvinceChina

Differentiation of oligodendrocyte progenitor cells into mature myelin-forming oligodendrocytes contributes to *** of remyelination due to oligodendrocyte progenitor cell death can result in severe nerve *** is an iron-dependent form of regulated cell death caused by membrane rupture induced by lipid peroxidation,and plays an important role in the pathological process of ischemic ***,there are few studies on oligodendrocyte progenitor cell *** analyzed transcriptome sequencing data from GEO databases and identified a role of ferroptosis in oligodendrocyte progenitor cell death and myelin injury after cerebral *** analysis suggested that perilipin-2(PLIN2)was involved in oligodendrocyte progenitor cell ***2 is a lipid storage protein and a marker of hypoxia-sensitive lipid droplet *** further investigation,we established a mouse model of cerebral ischemia/*** found significant myelin damage after cerebral ischemia,as well as oligodendrocyte progenitor cell death and increased lipid peroxidation levels around the infarct *** ferroptosis inhibitor,ferrostatin-1,rescued oligodendrocyte progenitor cell death and subsequent myelin *** also found increased PLIN2 levels in the peri-infarct area that co-localized with oligodendrocyte progenitor ***2 knockdown rescued demyelination and improved neurological *** findings suggest that targeting PLIN2 to regulate oligodendrocyte progenitor cell ferroptosis may be a potential therapeutic strategy for rescuing myelin damage after cerebral ischemia.

关键词： bioinformatics bulk RNA sequencing ferroptosis ischemic stroke myelin injury oligodendrocyte progenitor cell perilipin-2 single-cell RNA sequencing

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：