检索结果-南通市图书馆

Wetland and habitat dynamics in the evolving landscape of the Middle Yangtze River Basin

在线全文

学校读者我要写书评

暂无评论

Journal of Geographical Sciences 2025年第1期35卷 88-111页

作者： YANG Peng SUN Kaiya ZHU Yanchao XIA jun HUANG Heqing SONG Jingxia shi Xiaorui LU Xixi Hubei Key Laboratory of Regional Ecology and Environmental Change School of Geography and Information Engineering China University of Geosciences Department of Geography National University of Singapore State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University

Wetlands play a critical role in the global environment. The Middle Yangtze River Basin(MYRB), known for its abundant wetland resources, has experienced notable changes resulting from the complex interplay of environmental factors. Therefore, we investigated the spatiotemporal characteristics of wetland ecological quality in the MYRB from 2001 to *** the random forest(RF) regression algorithm and patch-generated land-use simulation(PLUS) model, we forecasted variations in wetland habitat quality and their determinants under the Shared Socioeconomic Pathway-Representative Concentration Pathway(SSPRCP) framework from 2035 to 2095. The main findings are as follows:(1) The RF algorithm was optimal for land-use and land-cover(LULC) classification in the MYRB from 2001 to 2020,when notable changes were observed in water bodies and buildings. However, the forested area exhibited an increase and decrease of 3.9% and 1.2% under the SSP1-2.6 and SSP5-8.5 scenarios, respectively, whereas farmland exhibited a diminishing trend.(2) Wetlands were primarily concentrated in the central and eastern MYRB, with counties in the southwest exhibiting superior ecological-environmental quality from 2001 to 2020. Notably,wetland coverage revealed significantly high level, significant changes, frequent but relatively minor changes under the SSP1-2.6, SSP2-4.5, and SSP 5-8.5 scenarios, respectively.(3)Regions with lower habitat quality were primarily concentrated in urbanized areas characterized by frequent human activities, indicating a clear degradation in habitat quality across different scenarios. In conclusion, we established a foundational framework for future investigations into the eco-hydrological processes and ecosystem quality of watersheds.

关键词：

Reelin modulates SVZ neuronal progenitor migration into ischemic cerebral cortex in vivo

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Reelin modulates SVZ neuronal progenitor migration into isch...

miRNA-21-5p is an important contributor to the promotion of injured peripheral nerve regeneration using hypoxia-pretreated bone marrow-derived neural crest cells

中国神经科学学会第九届全国学术会议暨第五次会员代表大会

作者： Ning SUN~*,Xun JIANG,jun-jie XIONG,Jing shi Department of Neurobiology and Key Laboratory of Neurological Disease of Ministry of Education,Tongji Medical College,Huazhong University of Science and Technology,Wuhan 430030,China

＜正＞Objective Stroke leads to a marked increase of cell proliferation in the subventricular *** new neuronal progenitors can migrate into the severely damaged area of the cerebral *** is a key factor that regulates neuronal migration during cerebral *** of reelin signaling occurs through interaction of disabled-1（Dabl）.However,the role of reelin in adult brain function is *** the present study, We tested the hypothesis that reelin leads to the migration of SVZ precursors to the area of ischemic cerebral cortex. Methods The left middle cerebral artery（MCA） was occluded and reperfused in male Sprague Dawley *** expression of reelin in ischemic cortex was measured by real-time RT-PCR and immunohistochemisrty *** new-born progenitors were labeled by retrovirus（MMLV-palm-mCherry）.The phenotype of reelin-positive cell and neuroblasts were analyzed by confocal *** receptor-associated protein（RAP） was administered into SVZ to prevent reelin from binding to its *** We found that transient MCA occlusion increased reelin gene expression and immunoreactivity in ischemic cerebral cortex,and the reelin-positive cells were GABAergic *** migrating progenitor cells were found in cerebral cortex after ischemia-reperfusion and expressed the downstream reelin signaling molecule *** of Reelin signaling decreased the *** activation of signaling molecules Dab-1 and PI3K/AKT mediated the *** These findings suggest that Reelin modulates SVZ progenitor migration to maintain cerebral integration after stroke in adult rat.

关键词： Reelin neural progenitor cell migration cerebral cortex stroke

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第1期20卷 277-290页

作者： Meng Cong Jing-Jing Hu Yan Yu Xiao-Li Li Xiao-Ting Sun Li-Ting Wang Xia Wu Ling-jie Zhu Xiao-Jia Yang Qian-Ru He Fei Ding Hai-Yan shi School of Medicine Nantong UniversityNantongJiangsu ProvinceChina Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education and Coinnovation Center of Neuroregeneration Nantong UniversityNantongJiangsu ProvinceChina Department of Physiology Jiangsu Health Vocational CollegeNanjingJiangsu ProvinceChina Department of Pathology Affiliated Hospital of Nantong UniversityNantongJiangsu ProvinceChina Jiangsu Clinical Medicine Center of Tissue Engineering and Nerve Injury Repair Affiliated Hospital of Nantong UniversityNantongJiangsu ProvinceChina

Our previous study found that rat bone marrow–derived neural crest cells(acting as Schwann cell progenitors)have the potential to promote long-distance nerve ***-based therapy can enhance peripheral nerve repair and regeneration through paracrine bioactive factors and intercellular ***,the complex contributions of various types of soluble cytokines and extracellular vesicle cargos to the secretome remain *** investigate the role of the secretome and extracellular vesicles in repairing damaged peripheral nerves,we collected conditioned culture medium from hypoxia-pretreated neural crest cells,and found that it significantly promoted the repair of sensory neurons damaged by oxygen-glucose *** mRNA expression of trophic factors was highly expressed in hypoxia-pretreated neural crest *** performed RNA sequencing and bioinformatics analysis and found that miR-21-5p was enriched in hypoxia-pretreated extracellular vesicles of neural crest ***,to further clarify the role of hypoxia-pretreated neural crest cell extracellular vesicles rich in miR-21-5p in axonal growth and regeneration of sensory neurons,we used a microfluidic axonal dissociation model of sensory neurons in vitro,and found that hypoxia-pretreated neural crest cell extracellular vesicles promoted axonal growth and regeneration of sensory neurons,which was greatly dependent on loaded ***,we constructed a miR-21-5p-loaded neural conduit to repair the sciatic nerve defect in rats and found that the motor and sensory functions of injured rat hind limb,as well as muscle tissue morphology of the hind limbs,were obviously *** findings suggest that hypoxia-pretreated neural crest extracellular vesicles are natural nanoparticles rich in ***-21-5p is one of the main contributors to promoting nerve regeneration by the neural crest cell *** helps to explain the mechanism of action of the secretome and e

关键词： axotomy cell-free therapy conditioned medium extracellular vesicles hypoxic preconditioning microRNA oxygen-glucose deprivation peripheral nerve injury Schwann cell precursors

风力机翼型同相对厚度条件下的气动性能模拟分析

在线全文

学校读者我要写书评

暂无评论

水电能源科学 2011年第3期29卷 185-187页

作者：王军盛杰施璐邹方茂华中科技大学能源与动力工程学院湖北武汉430074

针对翼型气动性能优劣将直接影响风力机使用过程中的效率问题,选取3种具有相同相对厚度(相对厚度为21%)而形状不同的常用风力机翼型NACA0021、NACA63421和S809进行二维建模和网格划分,对比3种翼型形状上的差异,并利用Fluent取雷诺数为5.... 详细信息

针对翼型气动性能优劣将直接影响风力机使用过程中的效率问题,选取3种具有相同相对厚度(相对厚度为21%)而形状不同的常用风力机翼型NACA0021、NACA63421和S809进行二维建模和网格划分,对比3种翼型形状上的差异,并利用Fluent取雷诺数为5.5×105时对其空气动力学性能进行数值模拟和分析,获得了不同攻角下3种翼型的升阻力系数和升阻比,并与试验数据进行对比验证。结果表明,3种风力机翼型中,在相同相对厚度、较低雷诺数条件下,具备一定弯度的风力机翼型NACA63421的气动性能优于其他2种,为风力机叶片翼型选型与改型设计提供了参考。

关键词：风力机翼型相对厚度数值模拟气动性能

在线全文

学校读者我要写书评

暂无评论

食用酒精和工业酒精的光谱检测技术研究

食品安全质量检测学报 2016年第7期7卷 2828-2834页

作者：严峰杨俊杰史久林南昌航空大学测试与光电工程学院南昌330063

目的建立一种食用酒精和工业酒精的快速光谱检测方法。方法样品经提取和蒸馏水配制,分为甲醇分析纯和乙醇分析纯对照组、工业酒精和食用酒精实验组、浓度均为50%的工业酒精水溶液和食用酒精水溶液实验组和浓度均为50%的甲醇水溶液和工... 详细信息

目的建立一种食用酒精和工业酒精的快速光谱检测方法。方法样品经提取和蒸馏水配制,分为甲醇分析纯和乙醇分析纯对照组、工业酒精和食用酒精实验组、浓度均为50%的工业酒精水溶液和食用酒精水溶液实验组和浓度均为50%的甲醇水溶液和工业酒精水溶液以及食用酒精水溶液实验组。使用光谱仪和紫外可见近红外分光光度计进行光谱检测。结果在10 min内完成对照组和实验组样品溶液配制,5 min获得样品紫外-可见光-近红外光谱。在光谱中,浓度为50%的工业酒精水溶液在220 nm和1150 nm处均有一个不同的特征峰,在200-300 nm波段有很大的强度差异,对比浓度均为50%的甲醇水溶液和食用酒精水溶液显示只有浓度为50%的工业酒精水溶液在200-300 nm波段内有特征峰。结论该方法检测快速、结果准确、操作简单。通过检测酒类产品在200-1400 nm波长范围的光谱,可以测定工业酒精和食用酒精的真假。

关键词：食用酒精工业酒精吸收光谱透射光谱紫外-可见光-近红外光谱法

五味子甲素对MPP^+致SH-SY5Y细胞ERK信号转导通路的影响

在线全文

学校读者我要写书评

暂无评论

中国兽医杂志 2017年第8期53卷 50-52页

作者：李妍张巍蔡同建赵东海罗军吕士杰吉林医药学院基础医学院吉林吉林132013 中国人民解放军第三军医大学军事预防医学院重庆沙坪坝400038

通过体外培养SH-SY5Y细胞,Tunel法观察五味子甲素(Schisandra A,Sch A)对MPP+染毒SH-SY5Y细胞形态的影响;激光共聚焦显微镜观察各组细胞核的变化;Western-Blot检测各组SH-SY5Y细胞中ERK及p-ERK蛋白表达水平的不同,探讨Sch A对1-甲基-4-... 详细信息

通过体外培养SH-SY5Y细胞,Tunel法观察五味子甲素(Schisandra A,Sch A)对MPP+染毒SH-SY5Y细胞形态的影响;激光共聚焦显微镜观察各组细胞核的变化;Western-Blot检测各组SH-SY5Y细胞中ERK及p-ERK蛋白表达水平的不同,探讨Sch A对1-甲基-4-苯基吡啶离子(1-methyl-4-phenylpyridinium ion,MPP+)引起的人神经母细胞瘤SH-SY5Y细胞凋亡及ERK信号转导通路的影响。结果发现,与正常对照组相比,1mmol/L MPP+染毒可引起SH-SY5Y细胞形态明显改变,凋亡细胞明显增多;各浓度组Sch A干预均可有效抑制SH-SY5Y细胞的凋亡。与对照组比较,MPP+组细胞中p-ERK蛋白表达明显抑制;而与MPP+染毒组相比,Sch A干预组p-ERK蛋白表达明显升高(P<0.05),且呈剂量依赖效应。结果表明,MPP+具有促进SH-SY5Y细胞凋亡的作用,而Sch A能明显缓解MPP+引起的SH-SY5Y细胞凋亡,该作用可能与ERK信号转导通路活性改变有关。

关键词： MPP^+ 五味子甲素帕金森病细胞模型凋亡 ERK

Optimized Bi-level Control for Day-ahead and Real-time Active Power Balancing of an Off-grid Wind Power-to-hydrogen System With ESS Considering Wind Power Uncertainty

在线全文

学校读者我要写书评

暂无评论

Dianwang Jishu/Power System Technology 2025年第1期49卷 52-62页

作者： Qiu, Yiwei Sun, Qingjie Wu, Chenxu Zhu, jie Zeng, Yangjun Chen, shi Zhou, Buxiang College of Electrical Engineering Sichuan University Sichuan Province Chengdu 610065 China State Grid Ningbo Power Supply Company Zhejiang Province Ningbo 315012 China

Since off-grid wind power-to-hydrogen (Wp2H) systems are not connected to the utility grid, the hydrogen production load and the energy storage system (ESS) must be coordinated to absorb wind power fluctuations and maintain system stability. Such coordination must consider the flexibility constraints of hydrogen production units, the overall hydrogen yield, and the degradation of batteries in the ESS to meet the economic goals of green hydrogen production. Therefore, an optimized bi-level control method for the active power balance is proposed. Firstly, using the Itô process to characterize wind power fluctuations and considering the real-time flexibility reserve of multiple electrolyzers, the upper level is formulated as an intra-day scheduling problem with a 15-minute resolution. Secondly, the lower level optimizes the real-time power of the electrolyzers and the ESS based on their on-off states and baseline power commanded by the upper level, considering the degradation cost of the ESS. This helps to absorb second-level wind power fluctuations. Finally, based on a project plan in Inner Mongolia, China, a case study verifies the effectiveness of the proposed method. © 2025 Power System Technology Press. All rights reserved.

关键词： Hydrogen storage

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

棉花抗旱品种筛选鉴定及抗旱性综合评价方法

干旱地区农业研究 2017年第1期35卷 240-247页

作者：李忠旺陈玉梁罗俊杰石有太冯克云陈子萱甘肃省农业科学院生物技术研究所甘肃兰州730070 甘肃省农业科学院作物研究所甘肃兰州730070

从甘肃敦煌、新疆的棉花栽培品种和国内外引进材料中选出76个遗传来源不同的棉花品种(系)作为参试材料,在年降雨量不足40 mm的甘肃省敦煌市设置了干旱胁迫和正常灌水两个处理,筛选出与棉花抗旱性密切相关的10个农艺性状和产量指标,采用... 详细信息

从甘肃敦煌、新疆的棉花栽培品种和国内外引进材料中选出76个遗传来源不同的棉花品种(系)作为参试材料,在年降雨量不足40 mm的甘肃省敦煌市设置了干旱胁迫和正常灌水两个处理,筛选出与棉花抗旱性密切相关的10个农艺性状和产量指标,采用综合抗旱系数(CDC)、综合抗旱指数(CDI)、综合隶属函数值(CDM)、抗旱性综合评价值(D)等四种综合评价方法对76份种质材料进行抗旱性评价。结果显示,四种综合评价方法两两之间的Pearson相关系数都在0.88以上,相关性均达到了极显著水平;再利用四种抗旱评价体系得分值对76个受试棉花品种(系)进行K-means划分聚类,最终将76个品种分为高抗(Ⅰ类,5个品种)、抗(Ⅱ类,9个品种)、中等(Ⅲ类,17个品种)、敏感(Ⅳ类,31个品种)、高敏(Ⅴ类,14个品种)5个抗旱等级。为进一步方便育种家简单准确地评价选育材料的抗旱性,利用筛选出的10个农艺性状指标的抗旱系数作为自变量,四种抗旱性综合评价体系得分值为因变量,采用逐步回归的方式建立了棉花抗旱性预测模型回归方程。

关键词：棉花抗旱性筛选评价

我国韭菜主产区韭菜迟眼蕈蚊田间种群的抗药性监测

在线全文

学校读者我要写书评

暂无评论

应用昆虫学报 2016年第6期53卷 1242-1249页

作者：丁倩王意婷刘俊杰史雪岩高希武宋敦伦中国农业大学植保学院昆虫系北京100193

【目的】建立韭菜迟眼蕈蚊Bradysia odoriphaga Yang et Zhang对10种常用药剂的敏感基线,并对4省7个主要韭菜产区的田间种群进行6种常用杀虫剂的抗药性水平监测。【方法】采用胃毒触杀联合毒力法对韭菜迟眼蕈蚊3龄幼虫进行室内生物测定... 详细信息

【目的】建立韭菜迟眼蕈蚊Bradysia odoriphaga Yang et Zhang对10种常用药剂的敏感基线,并对4省7个主要韭菜产区的田间种群进行6种常用杀虫剂的抗药性水平监测。【方法】采用胃毒触杀联合毒力法对韭菜迟眼蕈蚊3龄幼虫进行室内生物测定。【结果】建立了敏感品系对新烟碱类、有机磷类、菊酯类、昆虫生长调节剂类、吡咯类药剂的敏感基线。对7个地区的田间韭菜迟眼蕈蚊种群监测结果表明:其对有机磷类药剂均产生了抗药性,其中河南郑州种群对毒死蜱和辛硫磷产生了极高水平抗性;河南郑州种群对高效氯氰菊酯产生了中等水平抗性,其他各地区均处于敏感状态;大部分种群对新烟碱类药剂处于低等或中等水平抗性,但山东李坡种群对噻虫嗪产生了高水平抗性。【结论】本文建立的韭菜迟眼蕈蚊对10种杀虫剂的敏感基线及抗药性监测数据为抗性治理提供一定参考。

关键词：韭菜迟眼蕈蚊敏感基线抗性监测胃毒触杀联合毒力法