检索结果-南通市图书馆

Straw interlayer improves sunflower root growth: Evidence from moisture and salt migration and the microbial community in saline-alkali soil

引用

Journal of Integrative Agriculture 2024年第11期23卷 3870-3881页

作者： Mengmeng Chen Guoli Wang yupeng jing Jie Zhou Jiashen Song Fangdi Chang Ru Yu jing Wang Weini Wang Xia Sun Hongyuan Zhang Yuyi Li State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China Institute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural Sciences Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences College of Agriculture Nanjing Agricultural University Ordos Agriculture and Animal Husbandry Ecology and Resource Protection Center

A straw interlayer added to soil can effectively reduce soil salinity effects on plant growth, however, the effects of soil moisture, salt and microbial community composition on plant growth under a straw interlayer are unclear. A rhizobox study was conducted to investigate the role of straw interlayer thickness on soil moisture, salt migration, microbial community composition, as well as root growth in sunflower. The study included four treatments: Control(no straw interlayer); S3(straw interlayer of 3.0 cm); S5(straw interlayer of 5.0 cm); S7(straw interlayer of 7.0 cm). Straw interlayer treatments increased soil moisture by 8.2–11.0% after irrigation and decreased soil salt content after the bud stage in 0–40 cm soil. Total root length, total root surface area, average root diameter, total root volume and the number of root tips of sunflower plants were higher under straw interlayer treatments than in the control, and were the highest under the S5 treatment. This stimulated root growth was ascribed to the higher abundance of Chloroflexi and Verrucomicrobia bacteria in soil with a straw interlayer, which was increased by 55.7 and 54.7%, respectively,in the S5 treatment. Addition of a straw interlayer of 5 cm thickness is a practical and environmentally feasible approach for improving sunflower root growth in saline-alkali soil.

关键词： saline-alkali soil rhizobox soil water soil salt content bacterial community

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

基于数值模拟的温室湿帘-风机运行参数确定方法研究

引用

中国农机化学报 2024年第5期45卷 79-84页

作者：焦宁朱德兰荆宇鹏刘孟阳柳昌新西北农林科技大学水利与建筑工程学院陕西杨凌712100 西北农林科技大学旱区农业水土工程教育部重点试验室陕西杨凌712100 Breeding and Seed Production of Agricultural Crops of Tashkent State Agrarian University Tashkent100140Uzbekistan

为提高温室湿帘-风机系统降温效果、降低温室运行成本,运用计算流体力学方法(CFD)构建温室三维模型,模拟湿帘-风机系统运行过程,探究运行参数对温室内部温度场影响规律。对湿帘面积、风机风速、湿帘入口温度三种影响参数进行组合,通过... 详细信息

为提高温室湿帘-风机系统降温效果、降低温室运行成本,运用计算流体力学方法(CFD)构建温室三维模型,模拟湿帘-风机系统运行过程,探究运行参数对温室内部温度场影响规律。对湿帘面积、风机风速、湿帘入口温度三种影响参数进行组合,通过成本分析、温度占比及温度分布均匀性选配合适的湿帘-风机降温系统参数。结果表明:模拟值与实测值最大误差为3.983%,验证CFD模型的有效性。由数值模拟可知:温室水平向及竖直向存在梯度变化,在湿帘-风机降温系统开启210 s时,温室内部整体温度稳定在27.9℃。夏季高温季节,当温室温度高达35℃时,利用CFD优选出湿帘-风机降温系统配置参数为湿帘面积0.5 m^(2),风机风速4 m/s;湿帘入口温度23.85℃时,经过300 s温度由35℃降低至30℃,温室内温度偏差系数为0.077,满足作物生长需求且成本低。基于数值模拟的温室湿帘-风机降温系统的参数选取方法,可应用到陕西地区双拱温室中。

关键词：温室湿帘-风机降温系统数值模拟计算流体力学温度参数优化

来源：

维普期刊数据库博看期刊

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

Differential metabolite analysis of the pharmacodynamic differences between different ratios of Dahuang(Radix Et Rhizoma Rhei Palmati)-Taoren(Semen Persicae) herb pair

引用

Journal of Traditional Chinese Medicine 2024年第3期44卷 515-523页

作者： WANG Xiang HUANG Jianping WANG yupeng WANG Qilong jing Yajiang ZHANG Gang PENG Liang GAO jing WANG Hongyan YAN Yonggang Department of Key Laboratory of"Qin Pharmaceutical"Research and Development Shaanxi University of Traditional Chinese MedicineXianyang 712046China Department of yupeng Shaanxi Haitian Pharmaceutical Co. Ltd.Xianyang 712046China Department of Acupuncture and Tuina Shaanxi University of Traditional Chinese MedicineXianyang 712000China

OBJECTIVE: To explore the material basis of the difference of efficacy of Dahuang(Radix Et Rhizoma Rhei Palmati)-Taoren(Semen Persicae)(DT) drugs with different proportions. METHODS: Samples of different ratios of Dahuang(Radix et Rhizoma Rhei Palnati, DH) to Taoren(Semen Persicae, TR)(Group A 1∶1, B 2∶3, C 3∶2) were analyzed based on gas chromatography time-of-flight mass spectrometry untargeted metabolomics technique. RESULTS: A total of 240 primary metabolites were detected. Forty-one differential metabolites involved nine differential metabolic pathways, of which four were closely related to the efficacy of DT in the treatment of heat and blood stasis syndrome. These pathways included the biosynthesis of amino acid(phenylalanine tyrosine and tryptophan), flavonoids, unsaturated fatty acids, and the glycolysis/glycogenesis pathway. CONCLUSION: There are significant differences in the efficacy of different ratios of DT drugs, and their optimal ratio for the treatment of heat and blood stasis syndrome should be 1∶1.

关键词： metabolomics metabolic networks and pathways differential metabolites Dahuang(Radix Et Rhizoma Rhei Palmati) Taoren(Semen Persicae) kernel drug pairs

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

Discovery of antitumor diterpenoids from Casearia graveolens targeting VEGFR-2 to inhibit angiogenesis

引用

Chinese Journal of Natural Medicines 2024年第9期22卷 842-853页

作者： WANG Sibei LIU Yuhui LIANG Yue XI Yaru ZHAI yupeng LEE Dongho XU jing GUO Yuanqiang State Key Laboratory of Medicinal Chemical Biology College of Pharmacyand Tianjin Key Laboratory of Molecular Drug ResearchNankai UniversityTianjin 300350China State Key Laboratory of Functions and Applications of Medicinal Plants Guizhou Medical UniversityGuiyang 550014China Department of Plant Biotechnology College of Life Sciences and BiotechnologyKorea UniversitySeoul 02841South Korea

Eight novel clerodane diterpenoids(1-8)were isolated from the twigs of Casearia *** structures were elucidated through comprehensive nuclear magnetic resonance(NMR),high-resolution electrospray ionization mass spectrometry(HRESI-MS),and electronic circular dichroism(ECD)*** addition to structural determination,surface plasmon resonance(SPR)assays were conducted to investigate molecular interactions,revealing that compound 8 exhibited high affinity for vascular endothelial growth factor receptor 2(VEGFR2),a key regulator of tumor *** in vivo experiments demonstrated that compound 8 effectively inhibited angiogenesis and displayed significant antitumor activity by suppressing tumor proliferation and metastasis in zebrafish xenograft *** findings suggest that compound 8 holds promise as an anticancer lead compound targeting VEGFR-2 to obstruct tumor angiogenesis.

关键词： Clerodane diterpenoids Casearia graveolens Surface plasmon resonance Vascular endothelial growth factor receptor 2 Antitumor activity Zebrafish

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

Human ESC-derived vascular cells promote vascular regeneration in a HIF-1α dependent manner

引用

Protein & Cell 2024年第1期15卷 36-51页

作者： jinghui Lei Xiaoyu Jiang Daoyuan Huang Ying jing Shanshan Yang Lingling Geng yupeng Yan Fangshuo Zheng Fang Cheng Weiqi Zhang Juan Carlos Izpisua Belmonte Guang-Hui Liu Si Wang jing Qu Advanced Innovation Center for Human Brain Protection National Clinical Research Center for Geriatric DisordersXuanwu Hospital Capital Medical UniversityBeijing 100053China State Key Laboratory of Membrane Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China State Key Laboratory of Stem Cell and Reproductive Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China Aging Translational Medicine Center Intermational Center for Aging and CancerBeijing Municipal Geriatric Medical Research CenterXuanwu HospitalCapital Medical UniversityBeijing 100053China University of Chinese Academy of Sciences Beijing 100049China Institute for Stem Cell and Regeneration CASBeijing 100101China The Fifth People's Hospital of Chongqing Chongqing 400062China Beijing Institute for Stem Cell and Regenerative Medicine Beijing 100101China National Laboratory of Biomacromolecules CAs Center for Excellence in BiomacromoleculesInstitute of BiophysicsBeijing 100101China CAS Key Laboratory of Genomic and Precision Medicine Beijing Institute of GenomicsChinese Academy of SciencesBeijing 100101China China National Center for Bioinformation Beijing 100101China Sino-Danish College University of Chinese Academy of SciencesBeijing 101408China Sino-Danish Center for Education and Research Beijing 101408China Aging Biomarker Consortium China Altos Labs San DiegoCA 92121United State

Hypoxia-inducible factor(HIF-1α),a core transcription factor responding to changes in cellular oxygen levels,is closely associated with a wide range of physiological and pathological ***,its differential impacts on vascular cell types and molecular programs modulating human vascular homeostasis and regeneration remain largely ***,we applied CRISPR/Cas9-mediated gene editing of human embryonic stem cells and directed differentiation to generate HIF-ia-deficient human vascular cells including vascular endothelial cells,vascular smooth muscle cells,and mesenchymal stem cells(MsCs),as a platform for discovering cell type-specific hypox-ia-induced response *** comparative molecular profiling across cell types under normoxic and hypoxic conditions,we provide insight into the indispensable role of HIF-1αin the promotion of ischemic vascular *** found human MSCs to be the vascular cell type most susceptible to HIF-1a deficiency,and that transcriptional inactivation of ANKZF1,an effector of HIF-1a,impaired pro-angiogenic ***,our findings deepen the understanding of HIF-ia in human angiogenesis and support further explorations of novel therapeutic strategies of vascular regeneration against ischemic damage.

关键词： HIF-1 human ESC vascular cell regeneration

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

Integrating evolutionary genomics of forest trees to inform future tree breeding amid rapid climate change

引用

Plant Communications 2024年第10期5卷 59-81页

作者： Jiajun Feng Xuming Dan Yangkai Cui Yi Gong Minyue Peng yupeng Sang Par K.Ingvarsson jing Wang Key Laboratory for Bio-Resources and Eco-Environment of Ministry of Education College of Life SciencesSichuan UniversityChengduChina Department of Plant Biology Linnean Centre for Plant BiologySwedish University of Agricultural SciencesUppsalaSweden

Global climate change is leading to rapid and drastic shifts in environmental conditions,posing threats to biodiversity and nearly all life forms *** trees serve as foundational components of terrestrial ecosystems and play a crucial and leading role in combating and mitigating the adverse effects of extreme climate events,despite their own vulnerability to these ***,understanding and monitoring how natural forests respond to rapid climate change is a key priority for biodiversity conserva*** progress in evolutionary genomics,driven primarily by cutting-edge multi-omics technologies,offers powerful new tools to address several key *** include precise delineation of species and evolutionary units,inference of past evolutionary histories and demographic fluctuations,identification of environmentally adaptive variants,and measurement of genetic load *** the urgency to deal with more extreme environmental stresses grows,understanding the genomics of evolutionary history,local adaptation,future responses to climate change,and conservation and restoration of natural forest trees will be critical for research at the nexus of global change,population genomics,and conservation *** this review,we explore the application of evolutionary genomics to assess the effects of global climate change using multi-omics approaches and discuss the outlook for breeding of climate-adapted trees.

关键词： forest trees climate change multi-omics evolutionary genomics breeding

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

Ni-Cu bimetallic alloy anchored on nitrogen-doped carbon nanotubes for CO_(2)-to-CH_(4) electrochemical conversion

引用

Nano Research 2024年第8期17卷 6922-6930页

作者： jing Li Chuanyong jing Jin Wang School of Environment Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality SafeguardBeijing Jiaotong UniversityBeijing 100044China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Tangshan Research Institute Beijing Jiaotong UniversityTangshan 063000China

Electrocatalytic CO_(2) reduction to CH_(4) remains challenging due to multi-electron transfer and intermediates ***,we synthesized electrocatalysts by growing Ni-Cu alloy structure on nitrogen-doped carbon nanotubes(NixCuy-NCNT)for electrocatalytic CO_(2) reduction reaction(CO_(2)RR)via hydrothermal method followed by *** optimized Ni_(1)Cu_(1)-NCNT demonstrated a superior CO_(2)RR performance,achieving 99.7%FECH_(4)(FE=Faradaic efficiency)and 11.54 mA·cm^(−2) current density at−1.2 V *** hydrogen electrode(RHE),which outperformed single metal *** outstanding performance was due to the electrons transferred from Cu to Ni and Ni-Cu alloy shifted the d-band center toward the Fermi level,which was more conducive to the intermediate *** situ electrochemical attenuated total reflection(EC-ATR)and density functional theory(DFT)calculations revealed the appearance of *CHO intermediate and the pathway during the CO_(2)RR *** design of the bimetallic electrocatalyst in this study provides a new perspective for the highly selective reduction of CO_(2).

关键词： electrocatalytic CO_(2) reduction Ni-Cu alloy nitrogen-doped carbon nanotube(NCNT) electrochemical attenuated total reflection(EC-ATR) density functional theory(DFT)calculations

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

干冰微粒喷射清洗技术

引用

微纳电子技术 2012年第4期49卷 258-262页

作者：郭新贺王磊景玉鹏中国科学院微电子研究所北京100029

简要介绍了随着工艺节点的缩小,传统RCA清洗方法在硅片清洗工艺中的局限性和弊端,进而提出了以CO2为介质的新型干冰微粒喷射清洗方法。从CO2的物理特性出发,论述了CO2流经喷枪后形成干冰微粒的机理,并简要分析了干冰微粒喷射技术对颗粒... 详细信息

简要介绍了随着工艺节点的缩小,传统RCA清洗方法在硅片清洗工艺中的局限性和弊端,进而提出了以CO2为介质的新型干冰微粒喷射清洗方法。从CO2的物理特性出发,论述了CO2流经喷枪后形成干冰微粒的机理,并简要分析了干冰微粒喷射技术对颗粒污染物和有机污染物的清洗机理。在此基础上,介绍了自主研发的一台基于干冰微粒喷射技术的半导体清洗设备,对该设备的结构和各部分的作用作了简要介绍,论述了使用该设备对硅片进行清洗的工艺流程。通过对比实验发现,采用压强为8 MPa、纯度为5N的CO2作为气源,喷嘴前压强设置为11 MPa,使用该设备可以达到很好的清洗效果。

关键词： RCA清洗硅片清洗 CO2 干冰微粒喷射清洗设备

来源：

维普期刊数据库博看期刊

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

An uncertainty investigation for liner impedance eduction methods

引用

Chinese Journal of Aeronautics 2024年第3期37卷 49-59页

作者： Weihao SHI Xiaodong jing School of Energy and Power Engineering Beihang UniversityBeijing 100191China

Impedance eduction methods have been developed for decades to meet the increasing need for high-quality impedance data in the design and optimization of acoustic *** this end,it is important to fully investigate the uncertainty problem,to which only limited attention has been devoted so *** paper considers the possibility of acoustically-induced structural vibration as a nonnegligible uncertainty or error source in impedance eduction *** the frequency moves away from the resonant frequency,with the increase in the value of cavity reactance,the acoustic particle velocity inside liner orifices possibly decreases to the extent comparable to the vibration velocity of liner facing ***,the acoustically-induced vibration,although generally being weak except at the inherent structural frequencies,may considerably affect the impedance eduction results near the anti-resonant frequency where the liner has poor *** demonstrate the effect of structural vibration,the vibration velocity of liner facing sheet is estimated from the experimentally educed admittance of the liner samples whose orifices are sealed with ***,a three-dimensional numerical model is set up,in which normal particle velocity is introduced over the solid portion of liner facing sheet to imitate structural vibration,rather than directly solving the acoustic-structural coupling *** shown by the results,the vibration of liner facing sheet,whose velocity is as small as estimated by the experiment,can result in anomalous deviation of the educed impedance from the impedance model near the anti-resonant *** trend that the anomalous deviation varies with frequency is numerically captured.

关键词： Impedance eduction Uncertainty analysis Acoustically-induced structural vibration Anti-resonant frequency Perforated liner

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

A review on numerical studies of airflow dynamics and particle deposition in human respiratory system Author links open overlay panel

引用

Particuology 2024年第8期91卷 351-377页

作者： Hao jing Xinguang Cui School of Aerospace Engineering Huazhong University of Science and TechnologyWuhan430074China

Accurate assessment and prediction of airflow dynamics and particle deposition in the human respiratory tract are essential for human health,involving inhaled drugs for treating various diseases and toxic particles that can cause *** intricate process involves complex multiphase flow with distinct respiratory *** fluid dynamics(CFD)acts as a bridge,overcoming the limitations of in vivo and in vitro experiments and providing a means to fully comprehend and reveal the fundamental mechanisms of respiratory flow and particle behavior on a microscopic *** paper provides a comprehensive overview and concise summary of recent advancements in the numerical simulation of airflow and particle deposition in the human respiratory ***,it summarizes the transition of respiratory tract models from segmented models to emerging physiological characteristic models and whole-lung airway models,and the latest developments on the effects of key factors such as geometric variations,respiratory patterns,and particle physical/chemical properties on respiratory flow and particle deposition.A notable focus of this review is on emerging physiological characteristics models and their associated complex airflow and particle dynamics inside *** paper concludes with recommendations for future research to further advance the development of this field.

关键词： Airflow dynamics Particle deposition Human respiratory system Numerical modeling

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

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：