检索结果-南通市图书馆

Bioaccumulation of Lanthanum and Its Effect on Growth of Maize Seedlings in a Red Loamy Soil

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2006年第6期16卷 799-805页

作者： HU xin wang Xiao-rong wang Chao State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science Nanjing University Nanjing 210093 （China） School of Environmental Science and Engineering Hohai University Nanjing 210098 （China）

Through a pot culture lanthanum nitrate was applied to maize seedlings grown in a red loamy soil to investigate the physiological and toxic effects of added La on the growth of crop seedlings and La bioaccumulation to help understand the environmental chemistry behaviors of rare earth element as fertilizers in soils. Compared to the control, La concentrations in shoots and especially in roots of maize seedlings increased with an increase of La in the soil. Also, with added concentrations of La≥0.75 g La kg-1 soil and≥0.05 g La kg-1 soil, the dry weight of shoots and roots of maize seedlings was significantly reduced (P≤0.05), respectively, compared with the control. Additionally, La≥0.5 g kg-1 in the soil significantly inhibited (P≤0.05) primary root elongation. Roots were more sensitive to La stress than shoots and thus could be used as a biomarker to La stress. Overall, in the red loamy soil studied, La had no significant beneficial effects on the growth of maize at the added La levels above 0.1 g kg-1 soil.

关键词： bioaccumulation growth lanthanum maize seedlings red loamy soil

白花草木樨MaERF058基因耐旱功能验证

在线全文

学校读者我要写书评

暂无评论

草业学报 2024年第8期33卷 159-169页

作者：魏娜敬文茂许尔文王荣新赵晶忠马雪娥张吉宇刘文献甘肃省祁连山水源涵养林研究院甘肃张掖734000 兰州大学草种创新与草地农业生态系统全国重点实验室甘肃兰州730030 甘肃祁连山森林生态系统国家定位观测研究站甘肃张掖734000

干旱是农业生产中最常见的逆境胁迫之一,对植物的生长发育、光合作用、气孔开闭、渗透功能和激素调节等方面都会产生不良影响。白花草木樨在我国北方干旱地区广泛种植,是具有耐旱、耐盐碱、耐贫瘠和粗蛋白含量高等特点的优质牧草。转录... 详细信息

干旱是农业生产中最常见的逆境胁迫之一,对植物的生长发育、光合作用、气孔开闭、渗透功能和激素调节等方面都会产生不良影响。白花草木樨在我国北方干旱地区广泛种植,是具有耐旱、耐盐碱、耐贫瘠和粗蛋白含量高等特点的优质牧草。转录因子(TF)作为调控基因表达的重要蛋白分子,可作用于其下游启动子区的特定顺式元件以激活或抑制基因的转录,进而调控植物生长发育及响应逆境。植物ERF转录因子家族基因参与植物对非生物胁迫的抗性,是作物抗逆性改良的理想候选基因。本研究对白花草木樨关键耐旱基因MaERF058进行烟草亚细胞定位分析,发现该基因表达蛋白定位于细胞核。干旱胁迫下,过表达MaERF058的拟南芥长势明显优于野生型。干旱条件下转MaERF058基因白花草木樨毛状根脯氨酸含量较对照显著(P<0.01)增加;丙二醛含量显著(P<0.01)降低;过氧化氢酶活性显著(P<0.05)增加;单胺氧化酶染色(NBT法)结果显示转基因毛状根的活性氧含量低于对照。以上结果表明白花草木樨MaERF058基因编码的转录因子对调控白花草木樨响应干旱胁迫具有积极作用。研究结果为解析白花草木樨耐旱分子机制提供了新思路,同时也能够为加快耐旱牧草分子育种提供优异基因资源。

关键词：白花草木樨 ERF转录因子干旱胁迫遗传转化

Efficient construction of calcium fluoride nanoaggregates for enhanced water vapor adsorption

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Particuology 2024年第6期89卷 191-197页

作者： Dan-Lei Yang Jing Cao rong-Kun Liu Jie-xin wang School of Life Sciences and Chemical Engineering Jiangsu Second Normal UniversityNanjing210013China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing100029China Petrochemical Research Institute PetroChinaBeijing102206China

Calcium fluoride(CaF_(2))is an ideal adsorbent for the dehydration of gaseous hydrogen fluoride(HF)containing water *** this work,a novel CaF_(2)absorbent,spherical CaF_(2)nanoaggregates(NAs)with a closely packed structure,was proposed and efficiently fabricated by spray drying *** the building blocks of CaF_(2)NAs,the CaF_(2)nanoparticles(NPs)were prepared by the addition of excess calcium ions(Ca^(2+))or fluorine ions(F−)in the *** results indicated that the CaF_(2)NPs synthesized by excess Ca^(2+)and the corresponding NAs exhibited much better water vapor adsorption properties than their counterparts by excess F−,owing to higher zeta *** importantly,whether excess Ca^(2+)or F^(−),CaF_(2)NAs had further enhanced water vapor adsorption capacity compared to primary CaF_(2)NPs,possibly owing to their unique nano-micro secondary structures and higher surface *** work has great potential in the development of high-performance absorbents for separating moisture from corrosive gas HF.

关键词： CaF_(2)nanoaggregates Water vapor adsorption Spray drying

Surface iodine and pyrenyl-graphdiyne co-modified Bi catalysts for highly efficient CO_(2) electroreduction in acidic electrolyte

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第4期17卷 2381-2387页

作者： Min Zhang Juan wang xin rong Xiu-Li Lu Tong-Bu Lu MOE International Joint Laboratory of Materials Microstructure Institute for New Energy Materials and Low Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China

CO_(2) electroreduction to formic acid/formate would contribute to alleviating the energy and climate *** work reports a Bi-based catalyst derived from the in-situ electroreduction of Bi_(2)O_(2)CO_(3) modified with iodine and pyrenyl-graphdiyne(PGDY)on the surface for efficient electroreduction of CO_(2) in acidic electrolyte,with a high partial current density of 98.71 mA·cm^(-2) and high Faradaic efficiency(FE)>90%over the potential range from^(-1).2 to-1.5 V *** hydrogen electrode(RHE),as well as the long-term operational stability over 240 h without degradation in H-type *** results and density function theory calculations show that the synergistic effect of surface iodine and PGDY is responsible for this active and extremely stable process of CO_(2) electroreduction via lowering the energy barriers for formation of*OCHO intermediate,suppressing the competitive HER by enhancing the concentration of both K+and CO_(2) at reaction interface,as well as preventing the dissolution and re-deposition of active Bi atoms on surface during catalytic *** work provides new insight into designing highly active and stable electrocatalysts for CO_(2) reduction.

关键词： CO_(2) reduction electrocatalysis Bi-based catalysts acidic electrolyte

Micro-sized nanoaggregates:Spray-drying-assisted fabrication and applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2024年第2期85卷 22-48页

作者： Dan-Lei Yang rong-Kun Liu Yan Wei Qian Sun Jie-xin wang School of Life Sciences and Chemical Engineering Jiangsu Second Normal UniversityNanjing210013China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing100029China Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology School of Chemistry and Chemical EngineeringGuangxi UniversityNanning530004China

The applications of nanoparticles suffer from their extremely small size and intrinsic trend of *** nanoparticles to form micro-sized nanoaggregates(MNAs)with increased size,ordered structure,as well as controllable size,shape,and morphology is a crucial step in various fields of science and technology to maintain the unique characteristics of nanoparticles while obtaining greatly enhanced or new performance at the *** structure of MNAs prominently affects their functionality,which is determined by the arrangement of nanoparticles and the interaction between primary *** methods have been proposed to prepare the MNAs,in which spray-drying technology stands out considering the feasibility,scalability for industry,cost,and *** assembly of nanoparticles through spray-drying under tunable process parameters yields diverse physical properties and structural arrangements of nanoparticles of the MNAs,they therefore exhibit enormous potential in a wide range of application *** review presents the construction and applications of spray-dried *** factors that influence the size,morphology,and structure of the MNAs are discussed in *** addition,the outstanding application performance resulting from the tightly packed nanoparticles in regular-shaped MNAs obtained by the spray-drying process is illustrated.

关键词： Spray-drying Micro-sized nanoaggregates Applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于GPU加速的溃坝洪水演进模拟研究

水电能源科学 2024年第3期42卷 20-24页

作者：康永德李伟许尔文任小凤王荣新闫春鸣敬文茂兰州理工大学能源与动力工程学院甘肃兰州730050 甘肃省祁连山水源涵养林研究院甘肃张掖734000

溃坝洪水演进与淹没范围快速模拟,对指导抢险救灾至关重要。为此,引入GPU加速技术,构建了一套高效高分辨率溃坝数值模型,与经典三驼峰溃坝试验对比发现,模拟结果与试验结果非常吻合,并利用该模型模拟了典型溃坝洪水演进及溃口流场、溃... 详细信息

溃坝洪水演进与淹没范围快速模拟,对指导抢险救灾至关重要。为此,引入GPU加速技术,构建了一套高效高分辨率溃坝数值模型,与经典三驼峰溃坝试验对比发现,模拟结果与试验结果非常吻合,并利用该模型模拟了典型溃坝洪水演进及溃口流场、溃后水位变化情况。结果表明,模型能较好地模拟溃坝洪水演进,较好捕捉溃口发展过程及泥沙输移。t=200 s时溃决流量出现小峰值4 m3/s,t=450 s时,溃决流量出现最大峰值13.8 m3/s;随着下泄流量增大,溃口加速侵蚀和冲刷并逐渐连通,溃口由0.21 m扩大至0.40 m。GPU加速比约为CPU的10.33~13.75倍,且网格数越多,加速效果越明显。

关键词：溃坝水动力模型洪水演进 GPU加速

Mössbauer Study of Catalytically Grown Carbon Nanotube

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1998年第1期15卷 68-69页

作者： LI Qun-qing FAN Shou-shan HAN Wei-qiang GAO Nai-fei wang xin-rong Department of Physics Center of Atomic and Molecular SciencesTsinghua UniversityBeijing 100084

The valence states of iron in iron catalysts,hydrogen reduced catalysts,and catalytically grown carbon nanotubes are determined by Mössbauer spectra,*** results show that the iron exists as Fe,FeO,andα-Fe_(2)O_(3) in hydrogen reduced catalysts,whereas it exists as Fe-C alloy,FeO,and α-Fe_(2)O_(3) in the catalysts encapsulated in carbon *** is postulated that Fe in hydrogen reduced catalysts plays the main role in the formation of catalytically grown carbon nanotube.

关键词： ssbauer Catalytic carbon

Upcycling of Poly(butylene adipate-co-terephthalate)into Dual Covalent Adaptable Networks through Chain Breaking-Crosslinking Strategy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第10期42卷 1505-1513,I0011页

作者： Bin-Bo wang rong Huang xin wang Tao Jiang Yi wang Shuai Du Fa-Lin Li Jin Zhu Song-Qi Ma Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi214122China Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province Divisions of Polymers and CompositesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China University of Chinese Academy of Sciences Beijing100049China

Poly(butylene adipate-co-terephthalate)(PBAT),a widely studied biodegradable material,has not effectively addressed the problem of plastic *** into consideration the cost-effectiveness,upcycling PBAT should take precedence over direct composting *** present work adopts a chain breaking-crosslinking strategy,upcycling PBAT into dual covalent adaptable networks(CANs).During the chainbreaking stage,the ammonolysis between PBAT and polyethyleneimine(PEI)established the primary crosslinked ***,styrene maleic anhydride copolymer(SMA)reacted with the hydroxyl group,culminating in the formation of dual covalent adaptable *** contrast to PBAT,the PBAT-dual-CANs exhibited a notable Young's modulus of 239 MPa,alongside an inherent resistance to creep and *** to catalysis from neighboring carboxyl group and excess hydroxyl groups,the PBAT-dual-CANs exhibited fast stress ***,they could be recycled through extrusion and hot-press reprocessing,while retaining their *** straightforward strategy offers a solution for dealing with plastic waste.

关键词： Poly(butylene adipate-co-terephthalate) Dynamic crosslinked networks Chain breaking-crosslinking strategy Upcycle Recycle

Hierarchical crystalline-amorphous nanocomposites with high strength and large deformability enabled by elemental diffusion

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2024年第4期171卷 150-161页

作者： Liqiang wang Heyi wang xin Zhou Huangliu Fu James Utama Surjadi Shuo Qu Xu Song rong Fan Yang Lu Department of Mechanical Engineering City University of Hong KongHong KongChina Nano-Manufacturing Laboratory(NML) Shenzhen Research Institute of City University of Hong KongShenzhen 518057China Chengdu Research Institute City University of Hong KongChengdu 610200China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Department of Mechanical and Automation Engineering The Chinese University of Hong KongHong KongChina Department of Mechanical Engineering The University of Hong KongHong KongChina

Amorphous/nanocrystalline dual-phase structures have recently emerged as an effective way for over-coming the strength-ductility trade-offand breaking the limitation of the reverse Hall-Petch ***,we proposed a new strategy to develop a hierarchical and interconnected amorphous-crystalline nanocomposite arising from the nanoscale elemental interdiffusion and oxygen adsorption behavior dur-ing thermal treatment *** nanocomposite consisted of a three-dimensional(3D)hierarchical network structure where the crystalline phase(Cr-Co-Ni-Al)was embedded into the Al-O-based amor-phous phase network with critical feature sizes encompassing three orders of magnitude(from microm-eter to nanometer scale).It can achieve ultrahigh compression yield strength of-3.6 GPa with large homogeneous deformation of over 50%*** massive interstitial atoms induced lattice distortion and hierarchical amorphous phase boundary contributed to the strength *** situ Uniaxial compression inside a transmission electron microscope(TEM)revealed that the exceptional deformability of the nanocomposites resulted from the homogenous plastic flow of nano-sized amorphous phase and the plastic co-deformation behavior restricted by the nano-architected dual-phase *** proposed dual-phase synthesis approach can outperform conventional nanolaminates design strategies in terms of the mechanical properties achievable while providing a pathway to easily tune the microstructure of these nanolaminates.

关键词： Nanolaminates Dual-phase nanocomposites In situ transmission electron microscopy Multi-component alloy