检索结果-南通市图书馆

The role of maize root size in phosphorus uptake and productivity of maize/faba bean and maize/wheat intercropping systems

引用

Science China(Life Sciences) 2012年第11期55卷 993-1001页

作者： ZHANG YiKai CHEN FanJun LI Long CHEN YanHua liu bingran ZHOU YuLing YUAN LiXing ZHANG FuSuo MI GuoHua Key Laboratory of Plant-Soil Interactions Ministry of EducationCenter for ResourcesEnvironment and Food SecurityCollege of Resources and Environmental ScienceChina Agricultural UniversityBeijing 100193China

Interspecific root/rhizosphere interactions affect phosphorus (P) uptake and the productivity of maize/faba bean and maize/wheat intercropping systems. The aim of these experiments was to determine whether manipulation of maize root growth could improve the productivity of the two intercropping systems. Two near isogenic maize hybrids (the larger-rooted T149 and smaller-rooted T222) were intercropped with faba bean and wheat, under conditions of high- and low-P availability. The larger-rooted T149 showed greater competitive ability than the smaller-rooted T222 in both maize/faba bean and maize/wheat intercropping systems. The higher competitive ability of T149 improved the productivity of the maize/faba bean intercropping system in P-sufficient conditions. In maize/wheat intercropping systems, root growth, shoot biomass, and P uptake of maize were inhibited by wheat, regardless of the P-supply. Compared with T222, the larger-rooted T149 suffered less in the intercropping systems. The total biomass of the maize/wheat intercropping system was higher for wheat/T149 than for wheat/T222 under low-P conditions. These data suggested that genetic improvement of maize root size could enhance maize growth and its ability to compete for P resources in maize/faba bean and maize/wheat intercropping systems. In addition, depending on the P availability, larger maize roots could increase the productivity of intercropping systems.

关键词： faba bean intercropping maize phosphorus uptake root growth wheat

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

Modeling the Warming Impact of Urban Land Expansion on Hot Weather Using the Weather Research and Forecasting Model: A Case Study of Beijing, China

引用

Advances in Atmospheric Sciences 2018年第6期35卷 723-736页

作者： Xiaojuan liu Guangjin TIAN Jinming FENG bingran MA Jun WANG Lingqiang KONG State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University School of Government Beijing Normal University CAS Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of Sciences

The impacts of three periods of urban land expansion during 1990–2010 on near-surface air temperature in summer in Beijing were simulated in this study, and then the interrelation between heat waves and urban warming was assessed. We ran the sensitivity tests using the mesoscale Weather Research and Forecasting model coupled with a single urban canopy model,as well as high-resolution land cover data. The warming area expanded approximately at the same scale as the urban land expansion. The average regional warming induced by urban expansion increased but the warming speed declined slightly during 2000–2010. The smallest warming occurred at noon and then increased gradually in the afternoon before peaking at around 2000 LST—the time of sunset. In the daytime, urban warming was primarily caused by the decrease in latent heat flux at the urban surface. Urbanization led to more ground heat flux during the day and then more release at night, which resulted in nocturnal warming. Urban warming at night was higher than that in the day, although the nighttime increment in sensible heat flux was smaller. This was because the shallower planetary boundary layer at night reduced the release efficiency of near-surface heat. The simulated results also suggested that heat waves or high temperature weather enhanced urban warming intensity at night. Heat waves caused more heat to be stored in the surface during the day, greater heat released at night, and thus higher nighttime warming. Our results demonstrate a positive feedback effect between urban warming and heat waves in urban areas.

关键词： heat wave numerical simulation urbanization surface heat flux WRF UCM

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

儿童肝移植受者术后的长期存活及其影响因素分析

引用

中华器官移植杂志 2024年第5期45卷 308-314页

作者：刘源王炳然封明轩周韬罗毅夏强上海交通大学医学院附属仁济医院肝脏外科上海200127

目的探究儿童肝移植受者的长期存活情况及其影响因素。方法回顾性分析2006年10月至2022年12月在上海交通大学医学院附属仁济医院接受肝移植手术治疗的3004例(其中二次移植40例)终末期肝病患儿的临床背景、手术信息、围手术期管理和长期... 详细信息

目的探究儿童肝移植受者的长期存活情况及其影响因素。方法回顾性分析2006年10月至2022年12月在上海交通大学医学院附属仁济医院接受肝移植手术治疗的3004例(其中二次移植40例)终末期肝病患儿的临床背景、手术信息、围手术期管理和长期随访资料,通过Kaplan-Meier法分析肝移植术后受者和移植物的存活率;分别比较接受活体肝移植和遗体捐献肝移植、移植时体重≤5 kg和>5 kg、年龄≤5个月和>5个月、移植物受者体重比率(graft recipient weight ratio,GRWR)≤5%和>5%、供受者血型相容和不相容受者的存活率及2006年至2011年、2012年至2017年和2018年至2022年的受者存活率。分析并发症的发生情况。采用Cox回归分析法分析受者长期存活的影响因素,并将P5%受者存活率分别为83.7%(41/49)和90.0%(378/420),较体重>5 kg和GRWR≤5%的94.4%(2746/2915)和94.6%(2406/2544)低,差异均有统计学意义(P=0.007和0.001)。受者手术年龄和供受体血型相容性与移植术后存活率差异均无统计学意义(P=0.26和0.40)。感染[35.3%(70/198)]和外科并发症[24.2%(48/198)]是移植术后受者的主要死亡原因,感染[35.7%(25/70)]、门静脉并发症[18.6%(13/70)]和肺部损伤[15.7%(11/70)]是移植术后1个月内受者的主要死亡原因。术后感染和急性排斥反应的发生率分别从2006年至2011年的86.5%(76/88)和38.2%(34/88)下降到2018年至2022年的75.5%(1340/1775)和22.2%(394/1775)。移植术后手术相关主要并发症包括门静脉并发症(3.1%,92/3004)、出血(2.3%,68/3004)、肝动脉并发症(1.7%,50/3004)和肝静脉并发症(1.1%,33/3004)。单因素分析结果示:术前血红蛋白(P=0.012)、术前白细胞(P=0.026)、术前肌酐水平(P=0.008)、白蛋白(P=0.001)、凝血酶原时间(P=0.005)、体重≤5 kg(P=0.007),GRWR>5%(P=0.001)、术中失血(P<0.001)、红细胞输注(P<0.001)、术后ICU时间(P<0.001)、术后住院时间(P=0.045)、术后痰培养阳性(P<0.001)、术后腹水培养阳性(P=0.029)、术后出血性并发症(P<0.001)、术后肠穿孔(P<0.001)、发生急性排斥反应(P<0.001)、随访最大EB病毒载量(P<0.001)和移植后淋巴细胞增生性疾病(P=0.018)为影响儿童肝移植术后长期存活的因素。多因素分析结果示:术前肌酐(HR=1.015,95%CI:1.002~1.028,P=0.024)、GRWR(HR=2.082,95%CI:0.473~9.157,P=0.031)、痰培养阳性(HR=4.389,95%CI:2.248~8.569,P<0.001)、术后出血性并发症(HR=6.922,95%CI:1.871~25.610,P=0.004)、术后肠穿孔(HR=9.154,95%CI:2.307~36.323,P=0.002)和发生排斥反应(HR=0.452,95%CI:0.210~0.971,P=0.042)是儿童肝移植受者长期存活的独立危险因素。结论儿童肝移植受者的长期存活情况较好。改善术前脏器功能、提高手术精度、降低术中出血和减少术后并发症能够有效改善儿童肝移植受者的长期存活。

关键词：肝移植儿童儿童肝移植长期存活危险因素感染

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

芪丹地黄颗粒对糖尿病大鼠肾脏的保护作用

引用

辽宁中医杂志 2019年第6期46卷 1291-1295,1344页

作者：刘炳然谌祖江马飞经媛聂晓莉赵晓山罗仁南方医科大学中医药学院

目的:该研究旨在观察中药复方芪丹地黄颗粒(QDDHG)对糖尿病并发症的治疗作用。方法:将SD大鼠腹腔注射链脲佐菌素(STZ)诱导成糖尿病模型,实验分为6组(每组n=9),即正常对照组,糖尿病模型组,QDDHG高、中、低剂量组,及阳性药物(氯沙坦)对照... 详细信息

目的:该研究旨在观察中药复方芪丹地黄颗粒(QDDHG)对糖尿病并发症的治疗作用。方法:将SD大鼠腹腔注射链脲佐菌素(STZ)诱导成糖尿病模型,实验分为6组(每组n=9),即正常对照组,糖尿病模型组,QDDHG高、中、低剂量组,及阳性药物(氯沙坦)对照组。用氯沙坦或QDDHG治疗4周后,收集血液样品。分别于给药0、2、4、6、8、10周检测血糖和体质量。给药后第10周处死大鼠采血检测其血脂和血清肌酐(Scr)指标。前一天收集大鼠24 h尿液(24U-vol),记录尿量,并检测24 h尿蛋白(24 hU-pro)、内生肌酐清除率(Ccr),取器官进行病理形态学检测。结果:通过QDDHG治疗可显著改善糖尿病大鼠Scr、Ccr,低密度脂蛋白(LDL)及甘油三酯(TG),与正常组比较(P <0. 05)。对24 h U-pro改善尤为明显(P <0. 01),对血糖和体质量则无明显影响。病理结果显示对糖尿病大鼠的改善作用主要在肾脏,对胰腺,心脏和肝脏则没有明显影响。结论:QDDHG具有肾脏保护作用与血脂的调节功能。

关键词：芪丹地黄颗粒糖尿病肾脏保护血脂调节

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

Heterosis in root microbiota inhibits growth of soil-borne fungal pathogens in hybrid rice

引用

Journal of Integrative Plant Biology 2023年第4期65卷 1059-1076页

作者： Mengting Zhang Yinyue Wang Yuanyi Hu Huacai Wang Yawen liu bingran Zhao Jie Zhang Rongxiang Fang Yongsheng Yan State Key Laboratory of Plant Genomics Institute of Microbiologythe Chinese Academy of SciencesBeijing 100101China Innovation Academy for Seed Design the Chinese Academy of SciencesBeijing 100101China College of Advanced Agricultural Sciences University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Hybrid Rice Hunan Hybrid Rice Research CenterChangsha 410125China

In nature,plants are colonized by various microbes that play essential roles in their growth and *** is a natural genetic phenomenon whereby first-generation hybrids exhibit superior phenotypic performance relative to their *** remains unclear whether this concept can be extended to the“hybridization”of microbiota from two parents in their descendants and what benefits the hybrid microbiota might ***,we investigated the structure and function of the root microbiota from three hybrid rice varieties and their parents through amplicon sequencing analysis of bacterial 16S ribosomal DNA(rDNA)and fungal internal transcribed spacer(ITS)*** show that the bacterial and fungal root microbiota of the varieties are distinct from those of their parental lines and exhibit potential heterosis features in diversity and ***,the root bacterial microbiota of hybrid variety LYP9 protects rice against soil-borne fungal *** analysis of the protective capabilities of individual strains from a 30-member bacterial synthetic community derived from LYP9 roots indicated that community members have additive protective *** transcription profiling analyses suggested that LYP9 root bacterial microbiota activate rice reactive oxygen species production and cell wall biogenesis,contributing to heterosis for *** addition,we demonstrate that the protection conferred by the LYP9 root microbiota is transferable to neighboring plants,potentially explaining the observed hybrid-mediated superior effects of mixed *** findings suggest that some hybrids exhibit heterosis in their microbiota composition that promotes plant health,highlighting the potential for microbiota heterosis in breeding hybrid crops.

关键词： heterosis microbiota‐mediated protection rice root microbiota synthetic community

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

基于迁移学习和红外热成像的金属氧化物避雷器表面污染状态检测方法

引用

电瓷避雷器 2024年第1期 1-8页

作者：沈顺群宫旻刘凯万教智李冰然傅洪全国网湖北省电力有限公司神农架供电公司湖北神龙架442400 国家电网江苏省电力有限公司技能培训中心江苏苏州215000

金属氧化物避雷器外壳受灰尘、盐、碱等污染物长期沉积的影响,会导致其过早失效,因此,准确地检测金属氧化物避雷器表面的污染状态是非常重要的。基于此,面向饱和积污提出了一种利用红外热成像技术和迁移学习检测金属氧化物避雷器外壳污... 详细信息

金属氧化物避雷器外壳受灰尘、盐、碱等污染物长期沉积的影响,会导致其过早失效,因此,准确地检测金属氧化物避雷器表面的污染状态是非常重要的。基于此,面向饱和积污提出了一种利用红外热成像技术和迁移学习检测金属氧化物避雷器外壳污染严重程度的新方法。该方法通过拍摄不同污染状态下金属氧化物避雷器的红外热图像,经过适当的预处理后,捕获的红外热图像被送入预训练卷积神经网络“ResNet50”进行自动特征提取。提取的深度特征被输入到4个机器学习分类器,即k-最近邻分类器、支持向量机分类器、贝叶斯分类器和随机森林分类器中进行分类。其中,使用随机森林分类器获得了最佳性能。最后,通过仿真分析,结果表明所提方法可精确地感知金属氧化物避雷器表面的污染严重程度。

关键词：红外热成像卷积神经网络迁移学习金属氧化物避雷器污染严重程度分类和状态监测

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

调神为主针刺联合穴位贴敷对老年失眠患者的影响

引用

光明中医 2024年第9期39卷 1827-1829页

作者：白薇王炳然刘琪王首力郭政亚妮姬佳宇肖宇王梅北京市通州区新华街道社区卫生服务中心中医科

目的观察调神为主针刺联合穴位贴敷治疗老年失眠的疗效及对焦虑抑郁的影响。方法将100例老年失眠患者随机分为2组，每组50例。2组均给予调神为主针刺，治疗组在此基础上加用穴位贴敷，疗程为4周。观察2组治疗前后的匹兹堡睡眠质量指数... 详细信息

目的观察调神为主针刺联合穴位贴敷治疗老年失眠的疗效及对焦虑抑郁的影响。方法将100例老年失眠患者随机分为2组，每组50例。2组均给予调神为主针刺，治疗组在此基础上加用穴位贴敷，疗程为4周。观察2组治疗前后的匹兹堡睡眠质量指数(PSQI)、焦虑自评量表(SAS)和抑郁自评量表(SDS)评分。结果治疗后，2组患者PSQI评分均显著降低(P<0.05);治疗4周、结束后1个月，治疗组PSQI评分均显著低于对照组(P<0.05)。治疗后，2组患者SAS、SDS评分均显著降低(P<0.05),且治疗组SAS、SDS评分显著低于对照组(P<0.05)。结论调神为主针刺联合穴位贴敷治疗老年心肾不交型失眠疗效确切，且能改善患者焦虑抑郁，疗效优于单纯针刺。

关键词：不寐老年失眠心肾不交证调神针刺疗法穴位贴敷疗法

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

Reduction-responsive nucleic acid nanocarrier-mediated miR-22 inhibition of PI3K/AKT pathway for the treatment of patient-derived tumor xenograft osteosarcoma

引用

Bioactive Materials 2023年第10期28卷 376-385页

作者： Dafu Chen Chengyue Lei Weifeng liu Meiyu Shao Meizhou Sun Jianxun Guo Jingjing Cao Jing-Jun Nie Peng Luo Yuwen Luo bingran Yu Renxian Wang Shun Duan Fu-Jian Xu Laboratory of Bone Tissue Engineering Beijing Laboratory of Biomedical MaterialsNational Center for OrthopaedicsBeijing Research Institute of Traumatology and OrthopaedicsBeijing Jishuitan HospitalBeijing100035China State Key Laboratory of Chemical Resource Engineering Key Lab of Biomedical Materials of Natural Macromolecules(Beijing University of Chemical Technology)Ministry of EducationBeijing Laboratory of Biomedical MaterialsBeijing University of Chemical TechnologyBeijing100029China Department of Orthopaedic Oncology Surgery Beijing Jishuitan HospitalPeking UniversityBeijing100035China JST Sarcopenia Research Centre Beijing Research Institute of Traumatology and OrthopaedicsBeijing Jishuitan HospitalBeijing100035China

miRNAs are important regulators of gene expression and play key roles in the development of cancer, including osteosarcoma. During the development of osteosarcoma, the expression of miR-22 is significantly downregulated, making miR-22 as a promising therapeutic target against osteosarcoma. To design and fabricate efficient delivery carriers of miR-22 into osteosarcoma cells, a hydroxyl-rich reduction-responsive cationic polymeric nanoparticle, TGIC-CA (TC), was developed in this work, which also enhanced the therapeutic effects of Volasertib on osteosarcoma. TC was prepared by the ring-opening reaction between amino and epoxy groups by one-pot method, which had the good complexing ability with nucleic acids, reduction-responsive degradability and gene transfection performance. TC/miR-22 combined with volasertib could inhibit proliferation, migration and promote apoptosis of osteosarcoma cells in vitro. The anti-tumor mechanisms were revealed as TC/ miR-22 and volasertib could inhibit the PI3K/Akt signaling pathway synergistically. Furthermore, this strategy showed outstanding tumor suppression performance in animal models of orthotopic osteosarcoma, especially in patient-derived chemo-resistant and chemo-intolerant patient-derived xenograft (PDX) models, which reduced the risk of tumor lung metastasis and overcame drug resistance. Therefore, it has great potential for efficient treatment of metastasis and drug resistance of osteosarcoma by the strategy of localized, sustained delivery of miR-22 using the cationic nanocarriers combined with non-traditional chemotherapy drugs.

关键词： Nucleic acid delivery Nanoparticle Gene therapy Osteosarcoma Responsive Patient-Derived Xenograft(PDX)

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

Flexible electrostatic hydrogels from marine organism for nitric oxide-enhanced photodynamic therapy against multidrug-resistant bacterial infection

引用

Science China Materials 2022年第10期65卷 2850-2860页

作者： Yujie Sun Rong-Lai Wen Dan Yu Yiwen Zhu Liang Zheng Xiangdong liu Haoran Wang bingran Yu Fu-Jian Xu State Key Laboratory of Chemical Resource Engineering Key Lab of Biomedical Materials of Natural Macromolecules(Beijing University of Chemical TechnologyMinistry of Education)and Laboratory of Biomedical MaterialsCollege of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China School of Materials Science and Engineering Zhejiang Sci-Tech UniversityXiasha Higher Education ZoneHangzhou 310018China

The abuse of antibiotics in treating microbial infections has led to the emergence and prevalence of drugresistant ***,the development of novel antibacterial materials is attracting increasing ***,a series of flexible electrostatic hydrogels with excellent antibacterial ability were constructed using a mixture of nitric oxide(NO)-releasing nitrated chitosan(CSNO)and mesotetra(4-carboxyphenyl)porphine(TCPP)with salmon sperm DNA(ssDNA)*** cultured with gram-negative bacteria under solar simulator irradiation,TCPP-CSNO_(m)ssDNA_(n) hydrogels released reactive oxygen species(ROS)and NO to produce peroxynitrite ions(ONOO^(−)).ONOO−is efficient at killing bacteria,thereby improving the antimicrobial ability of photodynamic therapy against gram-negative *** hydrogels exhibited powerful antibacterial activity in vivo when used to treat skin infections caused by drugresistant bacteria,making them a promising candidate for clinical applications.A string of antibacterial hydrogels that release ROS and NO synergistically can bring new possibilities for effectively killing drug-resistant bacteria and be of great value in anti-infection wound dressings and other applications.

关键词： electrostatic hydrogel drug-resistant bacteria peroxynitrite photodynamic therapy

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

东北刺猬非冬眠期体温和内脏器官重量的季节性变化

引用

兽类学报 2010年第3期30卷 283-290页

作者：高玲郭炳冉王振龙江乐刘丹龙娣曲阜师范大学生命科学学院曲阜273165

异温动物的体温和内脏器官重量与其所处的环境密切相关,具有一定的可塑性。本文以活捕于鲁西南山区的东北刺猬为对象,比较了其体温和内脏器官的性别差异和季节变化,旨在了解其对环境的适应性特征。结果表明:1)东北刺猬的体温以夏季最高... 详细信息

异温动物的体温和内脏器官重量与其所处的环境密切相关,具有一定的可塑性。本文以活捕于鲁西南山区的东北刺猬为对象,比较了其体温和内脏器官的性别差异和季节变化,旨在了解其对环境的适应性特征。结果表明:1)东北刺猬的体温以夏季最高,且与环境温度呈正相关关系,但性别间无差异;2)东北刺猬的肥满度指数以春季最高,秋季最低,亦无性别差异;3)东北刺猬的内脏器官重量与体重呈显著的正相关关系,雌雄脾脏重量以春季最大,夏季最小;4)季节与性别间交互作用对肾上腺重量的影响显著,雄体睾丸和附睾秋季最轻,雌体子宫则秋季最轻;5)雌体心率显著高于雄体,无季节性差异;非冬眠期心电图中各个波持续时间无性别差异,QRS波群和T波的持续时间在秋季显著长于夏季和春季,S-T段相反,秋季最短。本文研究结果提示:东北刺猬非冬眠期的心率与体温变化无关,心脏功能受季节变化影响较小。体温、肥满度、脾脏、睾丸和附睾、子宫、心电等生理指标的可塑性对于东北刺猬适应环境具有重要意义。

关键词：东北刺猬非冬眠期体温内脏器官季节性

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

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：