检索结果-南通市图书馆

Effects of 1-aminobenzotriazole on the growth and physiological characteristics of Tamarix chinensis cuttings under salt stress

引用

Journal of Forestry Research 2021年第4期32卷 1641-1651页

作者： Jia sun Jiangbao Xia Ximei Zhao li su Chuanrong li Ping liu College of Forestry Taishan Forest Ecosystem Research StationKey Laboratory of State Forestry Administration for Silviculture of the Lower Yellow RiverShandong Agricultural UniversityTai’an 271018People’s Republic of China Shandong Key Laboratory of Eco-Environmental Science for the Yellow River Delta Binzhou UniversityBinzhou 256603People’s Republic of China

vegetation restoration is a main ecological remediation technology for greening saline and alkaline *** objectives of this study were to determine the effect of1-aminobenzotriazole(ABT-1) on the growth and physiology of Tamarix chinensis under salt stress and to determine a suitable ABT-1 concentration and soil salinity(Sc) for propagating *** were soaked in water and ABT-1 solutions at three concentrations(50,100,and 200 mg L^(-1)) and propagated in pots containing four soil salinity levels,mild(0.3%),moderate(0.6%),and severe(0.9% and 1.2%),and compared with a *** cuttings were measured to determine growth indices and physiological and biochemical indices(e.g.,chlorophyll content,superoxide dismutase activity,peroxidase activity,and malondialdehyde content).ABT-1 was effective in improving survival,growth,and physiological processes of cuttings under salt ***,there was a threshold effect when using ABT-1 to facilitate propagation under salt ***-1 effects were insignificant when applied at low concentrations( 100 mg L^(-1)),ABT-1 limited growth and physiological *** a salt stress level(Sc ≤0.9%),ABT applied at a 100 mg L^(-1)concentration increased chlorophyll content and superoxide dismutase and peroxidase activities in the leaves and reduced malondialdehyde accumulation and membrane lipid peroxidation *** a result,ABT-1 enhanced the resistance of *** to salt ***,under high salt stress(>0.9%) and ABT-1 concentration(> 100 mg L^(-1)),the physiological regulatory ability of *** seedlings *** grew well at a salt stress ≤0.9% and ABT ≤100 mg L^(-1) and exhibited relatively high physiological regulatory ability and high salt adaptability.

关键词： Salt stress Rooting powder Growth Physiological and biochemical indices Tamarix chinensis

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

GSK3β inhibits epithelial-mesenchymal transition via the Wnt/β-catenin and PI3K/Akt pathways

引用

International Journal of Ophthalmology(English edition) 2018年第7期11卷 1120-1128页

作者： Cheng Zhang li su li Huang Zheng-Yu Song Department of Ophthalmology Shanghai General Hospital(Shanghai First People's Hospital) Shanghai Jiao Tong University School of Medicine Shanghai 200000 China Shanghai Key Laboratory of Fundus Diseases Shanghai 200000 China Shanghai Engineering Center for Visual Science and Photomedicine Shanghai 200000 China Department of Ophthalmology Shanghai Shuguang HospitalShanghai University of Traditional Chinese MedicineShanghai 200000 China

AIM： To investigate the regulatory mechanism of glycogen synthase kinase 3β（GSK3β） in epithelialmesenchymal transition（EMT） process after proliferative vitreoretinopathy（PVR） induction. METHODS： Experimental PVR was induced by intravitreal injection of retinal pigment epithelium（RPE） cells in the eyes of rabbits. A PI3 K/Akt inhibitor（wortmannin） and a GSK3β inhibitor（li Cl） were also injected at different time during PVR progress. Electroretinogram（ERG）, ocular fundus photographs, and B-scan ultrasonography were used to observe the PVR progress. Western blot test on the extracted retina were performed at 1, 2, 4 wk. The expression of the mesenchymal marker vimentin was determined by immunohistochemistry. Toxicity of wortmannin and li Cl were evaluated by ERG and Td Tmediated d UTP nick-end labeling（TUNEL） assay. The vitreous was also collected for metabolomic analysis. REsuLTS： Experimental PVR could significantly lead to EMT, along with the suppressed expression of GSK3β and the activation of Wnt/β-catenin and PI3 K/Akt pathways. It was verified that upregulating the expression of GSK3β could effectively inhibit EMT process by suppressing Wnt/β-catenin and PI3 K/Akt pathways. CONCLUSION： GSK3β effectively inhibits EMT via the Wnt/β-catenin and PI3 K/Akt pathways. GSK3β may be regarded as a promising target of experimental PVR inhibition.

关键词： epithelial-mesenchymal transition experimental proliferative vitreoretinopathy glycogen synthase kinase 3β rabbits

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

Hydrothermal Origin of Early Permian Chert Nodules in the Central North China Craton linked to Northern Margin Cratonic Activation

引用

Acta Geologica Sinica(English Edition) 2021年第2期95卷 541-557页

作者： YAO Xu li su ZHOU Yaoqi linda A.HINNOV School of Earth Sciences Lanzhou UniversityLanzhou 73000China Key Laboratory of Mineral Resources in Western China(Gansu Province) Lanzhou UniversityLanzhou 730000China School of Geosciences China University of PetroleumQingdaoShandong 266580China Department of Atmosphere Ocean and Earth SciencesGeorge Mason UniversityFairfaxVirginia 22030USA

Sedimentary chert phases from the Archean to the present are widely used to trace sedimentary environments and tectonic ***,chert nodules occurring within carbonates have been the subject of possible hydrothermal or biogenic origin,in lieu of a diagenetic ***,chert nodules from a vast cratonic basin represent extremely rich silica accumulations but less noted is how they respond to submarine hydrothermal activity(and/or surface siliceous organism productivity).The links between the cratonic-type chert depositions and environmental changes regarding cratonic evolution need to be revisited at a large temporal-spatial *** chert nodules are widespread throughout the Lower Permian Taiyuan Formation in the North China Craton(NCC).Several Taiyuan chert-rich successions across the NCC have been selected to study possible links between chert deposition and cratonic evolution in scenario of partial cratonic activation of the northern NCC margin during the Late *** on stratigraphic correlation,the chert nodules are ubiquitously,evenly distributed throughout the Taiyuan Formation at a large craton-basin scale from the northern to southern interior *** results,elemental abundances,together with silicon and oxygen isotopic compositions of chert samples infer significant hydrothermal contributions for the silica ***,the cratonic-scale chert depositions of hydrothermal origin infer a giant and remote silica reservoir,linking to the large igneous province and magmatism in the NCC northern *** Taiyuan chert nodules could be unique marine sedimentary archives recording the Late Paleozoic NCC partial activation,which also generated continental records of igneous rocks,bauxites and *** strong tectonics of the northern margin,south-dipping topography and northward transgression of the Early Permian NCC facilitated the chert deposition on the shallow marine platform in the cratonic interior.

关键词： chert silicification silicon and oxygen isotopes hydrothermal scenarios partial activation North China Craton

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

Influence of grain segregation on the behavior of sand in triaxial tests

引用

Journal of Mountain Science 2021年第10期18卷 2776-2790页

作者： YU Fang-wei PENG Xiong-zhi su li-jun Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of SciencesBeijing 100101China China-Pakistan Joint Research Center on Earth Sciences CAS-HECIslamabad 45320Pakistan University of Chinese Academy of Sciences Beijing 100049China Department of Civil Engineering The University of TokyoTokyo 113-8656Japan Department of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China

As a common phenomenon in granular flow, grain segregation plays a great role in affecting the behavior of granular soil by causing a great change of grain-void distribution in granular soil. This paper presents an experimental study on the influence of grain segregation on the behavior of sand, by a number of triaxial tests to interpret the characteristic behavior, friction and dilatancy behavior, excess pore water pressure behavior and critical state behavior of sand incorporating grain segregation. An index-grain segregation index was proposed to quantify grain segregation. Grain segregation affected greatly the characteristic behavior of sand, causing the movement of void ratio-dilatancy relation of sand towards the increase of void ratio and dilatancy of sand. In the drained tests, the mobilized friction angle of sand showed a decrease followed by an increase but the mobilized dilatancy angle of sand increased, with increasing grain segregation index. An increase in grain segregation index impaired the basic friction of sand. In the undrained tests, the mobilized friction angle of sand showed an increase followed by a decrease with increasing grain segregation index. However, grain segregation caused an increase of the mobilized dilatancy of sand followed by a different development. An increase in grain segregation resulted in a higher summit of the dilatancy of sand but with a faster decrease along axial strain. In the q-p′ plane, grain segregation caused a reciprocating rotation of the dilatancy line and failure line of sand. Grain segregation resulted in enhancement of the peak-state dilatancy of sand, affecting greatly peakstate friction angle and peak-state basic friction angle of sand as well as the normalized excess pore water pressure. The excess friction angle of sand showed an increase followed by a decrease in the drained tests but increased linearly in the undrained tests, with increasing grain segregation index. The excess friction angle-over-maxim

关键词： Critical state Dilatancy Friction Grain segregation Landslides Soil behavior Triaxial tests

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

Synthesis and Herbicidal Activity of Novel sulfonylureas Containing 1,2,4-Triazolinone Moiety

引用

Chemical Research in Chinese Universities 2013年第3期29卷 466-472页

作者： liU Zhuo PAN li liYong-hong WANG su-hua li Zheng-ming State Key Laboratory of Elemento-Organic Chemistry Institute of Elemento-Organic Chemistry Nankai University Tianjin 300071 P. R. China

A series of new sulfonylureas incorporating 1,2,4-triazolinone moiety was synthesized, which were further bio-assayed for the herbicidal activity against four herbs, representative of monocotyledons and dicotyledons. Some of them exhibited high potency to inhibit the growth of dicotyledons（Bassica napus and Arnaranthus retroflexus） in the pot experiment. Compounds 9a and 9b also displayed an excellent herbicidal activity against Bassica napus at a concentration of 15 g/hectare, which were comparable with commercial triasulfuron.

关键词： sulfonylurea herbicide Acetohydroxyacid synthetase(AHAS) 1,2,4-Triazolinone derivative Protox Herbicidal activity

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

Hydrated nickel(Ⅱ) halides mediated ring opening reaction with N-tosylaziridines

引用

Chinese Chemical Letters 2012年第3期23卷 285-288页

作者： Wan Xuan Zhang Wei Gang Hu li su li Qin liu Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules Hubei UniversityWuhan 430062China

An efficient and water tolerant method for the synthesis ofβ-haloamines is described utilizing hydrated nickel（Ⅱ） halides （NiX_2ⅩnH_2O X = Cl,Br,I） and aziridines as starting materials.N-Tosylaziridines reacted with NiCl_2·6H_2O or NiI_2·6H_2O givingβ-chloro -orβ-iodoamines in high yields（73-99%） within a short time,but 10 mol%of n-Bu_4NBr should be added in the reactions of N-tosylaziridines with NiBr_2·3H_2O in order to obtain the high yields of correspondingβ-*** played an important role in the *** proper solvent for the reaction of NiCl_2·6H_2O was DMF,while NiBr_2·3H_2O or NiI_2·6H_2O proceeded well in 1,4-dioxane.

关键词： N-Tosylaziridines Hydrated nickel(Ⅱ) halides Ring opening reaction β-Haloamines

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

Influence of particle breakage on the isotropic compressibility of sands

引用

Journal of Mountain Science 2022年第7期19卷 2086-2099页

作者： YU Fang-wei su li-jun PENG Xiong-zhi Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu610299China Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of SciencesBeijing100101China China-Pakistan Joint Research Center on Earth Sciences Islamabad45320Pakistan University of Chinese Academy of Sciences Beijing100049China Department of Civil Engineering The University of TokyoTokyo113-8656Japan Department of Civil Engineering Southwest Jiaotong UniversityChengdu610031China

Particle breakage is a theme of great focus on affecting the behavior of granular *** paper presents an experimental investigation on the influence of particle breakage on the isotropic compressibility of the precrushed sands using a number of drained isotropic consolidation *** breakage resulted in movement of the compression lines followed by the rebound lines towards a decrease in the void ratio,implying that particle breakage caused a more contractive *** breakage impaired the bulk deformation modulus by increasing the compression coefficient for the compression behavior of the precrushed sands,but showed a complex effect on the bulk deformation modulus and rebound coefficient for the rebound behavior of the precrushed ***,particle breakage caused an increase in the compression indexes of the precrushed sands but showed a complex effect on the rebound indexes of the precrushed *** the e-p’plane and the e-logp’plane,the compression lines and rebound lines of the precrushed sands were curved.A generalized model was proposed to straighten the compression and rebound lines of the precrushed sands in the e-(p’p_(a))^(α) *** breakage resulted in a general rotation and translation of the linear compression and rebound lines of the precrushed sands in the e-(p’p_(a))^(α)*** critical state line and isotropic consolidation line on the loosest state of silica sand no.5 were curved in the e-logp’plane but straightened in the e-p’^(α=0.7) *** the e-p’^(α=0.7 )plane,a reasonable linear critical state line of silica sand no.5 was proposed by adjusting it to match the isotropic consolidation line on the loosest state.

关键词： Compression Isotropic consolidation Particle breakage Rebound Sands Triaxial tests

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 back-propagation neural-network-based displacement back analysis for the identification of the geomechanical parameters of the Yonglang landslide in China

引用

Journal of Mountain Science 2017年第9期14卷 1739-1750页

作者： YU Fang-wei PENG Xiong-zhi su li-jun Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China Department of Civil Engineering Southwest Jiaotong University Chengdu 610031 China CAS Center for Excellence in Tibetan Plateau Earth Sciences Bering 100101 China University of Chinese Academy of Sciences Beijing 100049 China

Xigeda formation is a type of hundredmeter-thick lacustrine sediments of being prone to triggering landslides along the trunk channel and tributaries of the upper Yangtze River in China. The Yonglang landslide located near Yonglang Town of Dechang County in Sichuan Province of China, which was a typical Xigeda formation landslide, was stabilized by anti-slide piles. Loading tests on a loading-test pile were conducted to measure the displacements and moments. The uncertainty of the tested geomechanical parameters of the Yonglang landslide over certain ranges would be problematic during the evaluation of the landslide. Thus, uniform design was introduced in the experimental design,and by which, numerical analyses of the loading-test pile were performed using Fast Lagrangian Analysis of Continua(FLAC3D) to acquire a database of the geomechanical parameters of the Yonglang landslide and the corresponding displacements of the loadingtest pile. A three-layer back-propagation neural network was established and trained with the database, and then tested and verified for its accuracy and reliability in numerical simulations. Displacement back analysis was conducted by substituting the displacements of the loading-test pile to the well-trained three-layer back-propagation neural network so as to identify the geomechanical parameters of the Yonglang landslide. The neuralnetwork-based displacement back analysis method with the proposed methodology is verified to be accurate and reliable for the identification of the uncertain geomechanical parameters of landslides.

关键词： Back-propagation neural network Displacement back analysis Geomechanical parameters Landslide Numerical analysis Uniform design Xigeda formation

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

Multilayered flexible nanocomposite for hybrid nano- generator enabled by conjunction of piezoelectricity and triboelectricity

引用

Nano Research 2017年第3期10卷 785-793页

作者： Huayang li li su Shuangyang Kuang Youjun Fan Ying Wu Zhong lin Wang Guang Zhu Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences National Center for Nanoscience and Technology (NCNST) Beijing 100083 China Chongqing University of Science and Technology Chongqing 401331 China School of Materials Science and Engineering Georgia Institute of Technology A tlanta GA 30332 USA

We fabricate a flexible hybrid nanogenerator （HNG）, based on multilayered nanocomposite materials, which integrates a piezoelectric nanogenerator （PENG） and a triboelectric nanogenerator （TENG） into a single structure with only two electrodes. The HNG enables enhancement of the electrical output of the nano- generators. An open-circuit voltage of 280 V and a short-circuit current of 25 μA are achieved by a HNG of 2.5 cm × 2.5 cm in size, superior to the performance of previously reported HNGs. In addition, the energy-conversion process of the HNG relies on the working mechanism of both the PENG and TENG. The polarization direction and doping content of BTO are the two major factors that affect the electrical output. Biomechanical energy harvesting from walking motion or the bending of an arm is also demonstrated.

关键词： energy harvesting nanocomposite hybrid nanogenerator piezoelectricity triboelectricity

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

An evaluation method for internal erosion potential of gravelly soil based on particle size distribution

引用

Journal of Mountain Science 2022年第4期19卷 1203-1214页

作者： ZHU Qin su li-jun liU Zhen-yu WANG Bin Key Laboratory of Mountain Hazards and Earth surface Process Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China University of Chinese Academy of Sciences Beijing 100049China China-Pakistan Joint Research Centre on Earth Sciences Islamabad 45320Pakistan

Internal erosion occurs when fine particles escape from the soil driven by seepage flow,which is considered to be the crucial factor causing the failure of earth structures filled with gravelly *** objective of this paper is to suggest an appropriate method to assess internal erosion potential of gravelly *** analyzing the sensitivity of soil material to internal erosion,the variable(Dc15/df85)max and the content of coarse particles(Pc)are selected as the evaluation indexes(Dc15 and df85 are the diameters of 15%mass passing in the coarse component and 85%mass passing in the fine component,respectively).A series of gravelly soils with different particle size distributions are tested for internal erosion by the self-made *** on the test results,an evaluation method for the internal erosion of gravelly soil is *** soil is prone to internal erosion when 60%≤Pcliability of the *** proposed method makes it possible to accurately assess internal erosion of gravelly soil,and an alternative method is provided for engineers to determine whether there is a risk of internal erosion in earth structures consisting of gravelly soil.

关键词： Internal erosion Gravelly soil Evaluation method Particle size distribution Coarse particle content

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：