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Organic modification of carbon nanotubes

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Chinese Science Bulletin 2002年第6期47卷 441-447页

作者： Luqi Liu zhixin guo Liming Dai Daoben Zhu Chinese Acad Sci Inst Chem Beijing 100080 Peoples R China

The organic modification of carbon nanotubes is a novel research field being developed recently. In this article, the history and newest progress of organic modification of carbon nanotubes are reviewed from two aspects: organic covalent modification and organic noncovalent modification of carbon nanotubes. The preparation and properties of organic modified carbon nanotubes are discussed in detail. In addition, the prospective development of organic modification of carbon nanotubes is suggested.

关键词： carbon nanotubes organic chemistry modification.

Light regulation of horticultural crop nutrient uptake and utilization

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Horticultural Plant Journal 2021年第5期7卷 367-379页

作者： Jin Xu zhixin guo Xiaochun Jiang Golam Jalal Ahammed Yanhong Zhou Department of Horticulture Zijingang CampusZhejiang UniversityHangzhou310058China Zhejiang Provincial Key Laboratory of Horticultural Plant Integrative Biology Hangzhou 310058China Key Laboratory of Plant Growth Development and Quality ImprovementAgricultural Ministry of ChinaHangzhou310058China College of Horticulture and Plant Protection Henan University of Science and TechnologyLuoyangHenan 471023China

Plants demonstrate dynamic changes in molecular structures under fluctuating light *** evidence suggests that light plays a vital role in plant growth and *** particular,light has a role in the absorption and utilization of nutrients in *** significant progress in understanding the mechanism of nutrient acquisition and assimilation,how light affects and regulates ion uptake remains a *** in model plants,Arabidopsis thaliana,suggest that light affects the nutrient utilization in roots through a complex regulatory network;nonetheless,the molecular mechanisms underlying the various effects of light on these processes in crop plants remain *** this review,we discuss the light effects(light quality,light intensity,and photoperiod)on nutrient uptake and utilization in horticultural crops for optimizing crop productivity and increasing fertilizer use efficiency.

关键词： Light signaling Nutrient utilization Horticultural crops Phytochrome

Electrochemistry of carboxylated nanodiamond films

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Science China Chemistry 2012年第11期55卷 2445-2449页

作者： LI YanShuang LUO HongXia DAI LiMing guo Wei LI ShaNa guo zhixin Department of Chemistry Renmin University of China Beijing 100872China Department of Chemical Engineering Case Western Reserve UniversityClevelandOH 44106USA

The electrochemical behavior of nanodiamond （ND） film functionalized with carboxylic acid groups was studied systemati- cally on a glassy carbon （GC） electrode. One stable redox couple corresponding to the carboxylic acid group was observed. At the scan rate of 0.1 V/s, the cathodic and anodic peak potentials were -0.093 V and 0.088 V （vs. Ag/AgCI）, respectively. The carboxylic acid groups on the ND surface were reduced to CH2OH via a four electron redox process. The ND film modified electrode showed favorable electrocatalytic behavior toward the oxidation as well as the reduction of biomolecules, such as tryptophan and nicotinamide adenine dinucleotide.

关键词： carboxylated nanodiamond film cyclic voltammetry catalysis biomolecules

Preparation and Properties of Polyvinyl Chloride/Carbon Nanotubes Composite

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Journal of Wuhan University of Technology(Materials Science) 2019年第3期34卷 516-520页

作者： TAO Jiashun QIN Yujun guo zhixin Department of Chemistry Renmin University of China

Chemically functionalized carbon nanotubes were combined with PVC to enhance both toughness and strength by simply mixing long alkyl chain modified multi-wall carbon nanotubes (abbreviated as MWNTs) or Ester-functionalized soluble MWNTs (abbreviated as eMWNTs) with PVC in Tetrahydrofuran (THF)/Cyclohexanone (CH) solution to obtain good dispersity solution. The MWNTs modified with 1-Bromohexadecane can effectively increase the intermolecular force with PVC by hydrogen bond. The obtained nanocomposite has a regular shape with homogeneously dispersed particles. PVC/2 wt% eMWNTs has been proved to possess excellent thermal stability. The intermolecular force between eMWNTs and PVC endows the as-fabricated nanocomposite with enhanced toughness and strength, indicating that our method is promising for wide use in PVC/eMWNTs nanocomposition.

关键词： polyvinyl chloride (PVC) toughness and strength MWNTs

Ultra-low thermal conductivity of two-dimensional phononic crystals in the incoherent regime

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npj Computational Materials 2018年第1期4卷 478-484页

作者： guofeng Xie Zhifang Ju Kuikui Zhou Xiaolin Wei zhixin guo Yongqing Cai Gang Zhang School of Materials Science and Engineering Hunan University of Science and Technology411201 XiangtanChina Hunan Key Laboratory of Micro-Nano Energy Materials and Devices School of Physics and OptoelectronicsXiangtan University411105 HunanChina Institute of High Performance Computing Singapore 138632Singapore

Two-dimensional silicon phononic crystals have attracted extensive research interest for thermoelectric applications due to their reproducible low thermal conductivity and sufficiently good electrical *** thermoelectric devices in high-temperature environment,the coherent phonon interference is strongly suppressed;therefore phonon transport in the incoherent regime is critically important for manipulating their thermal *** the basis of perturbation theory,we present herein a novel phonon scattering process from the perspective of bond order imperfections in the surface skin of *** incorporate this strongly frequency-dependent scattering rate into the phonon Boltzmann transport equation and reproduce the ultra low thermal conductivity of holey silicon *** reveal that the remarkable reduction of thermal conductivity originates not only from the impediment of low-frequency phonons by normal boundary scattering,but also from the severe suppression of high-frequency phonons by surface bond order imperfections *** theory not only reveals the role of the holey surface on the phonon transport,but also provide a computation tool for thermal conductivity modification in nanostructures through surface engineering.

关键词： conductivity thermal regime

Shade responses of prostrate and upright turf-type bermudagrasses

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Grass Research 2022年第1期2卷 62-70页

作者： zhixin guo Jia Jiang Lili Dong Xiaoyang Sun Jingbo Chen Fuchun Xie Yajun Chen College of Horticulture Northeast Agricultural UniversityHarbin 150030China College of Animal Science and Technology Northeast Agricultural UniversityHarbin 150030China Institute of Botany Jiangsu Province and Chinese Academy of SciencesNanjing 210014China

Bermudagrass(Cynodon dactylon)shade tolerance is a trait of immense importance to the turfgrass ***,little is known about shade tolerance of turf-type bermudagrass native to *** knowledge of the mechanism of shade tolerance in bermudagrass is required to identify specific plant features that promote shade tolerance and assist breeding efforts *** study examines shade tolerance of two different bermudagrass cultivars,Yangjiang(prostrate form)and Guanzhong(upright form),which were developed in *** cultivar was subjected to 0,30.4,61.2,and 90.6%shade levels during growth and assessed for turf quality,turfgrass color intensity,biomass allocation,growth rate,antioxidant enzyme activity,leaf anatomy,and photochemical *** generally demonstrated that turf quality and turf color intensity were lower in Guanzhong compared with Yangjiang on the 90.6%shade testing *** exhibited a less severe reduction of growth rate,leaf thickness,root to shoot ratio,and chlorophyll a to chlorophyll b ratio(Chla/b)under 90.6%shade compared with *** cultivars exhibited a decrease in photochemical efficiency as determined by reduced qP,ETR,and Fv/Fm *** efficiency was impacted less in Yangjian,and superoxide dismutase(SOD),peroxidase(POD),and catalase(CAT)enzymes activities were greater than in Guanzhong when exposed to severe *** exposed to 90.6%shade level,Yangjiang had better turf quality than Guanzhong as determined by morphological,anatomical,and physiological *** efforts focused on these shade tolerance features will lead to improved bermudagrass germplasm and aid turf management in shade environments.

关键词： properties. cultivar photochemical

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双亲性C_(60)衍生物水相聚集行为

化学进展 2008年第4期20卷 548-557页

作者：张璞吕爽郭志新中国人民大学化学系北京100872 北京理工大学化学系北京100081

富勒烯C60几乎不溶于水,从而阻碍了对富勒烯的进一步研究和应用。双亲性C60衍生物在水相中自组装形成聚集体,在水相具有一定的溶解度,其特殊的结构及性能引起了科学家的广泛关注。本文对双亲性C60衍生物在水相中聚集行为的研究进展进行... 详细信息

富勒烯C60几乎不溶于水,从而阻碍了对富勒烯的进一步研究和应用。双亲性C60衍生物在水相中自组装形成聚集体,在水相具有一定的溶解度,其特殊的结构及性能引起了科学家的广泛关注。本文对双亲性C60衍生物在水相中聚集行为的研究进展进行了系统的介绍。第一部分主要阐述了双亲性C60衍生物的结构,根据修饰到C60表面的功能基类型对双亲性C60衍生物进行了分类。第二部分主要阐述了双亲性C60衍生物在水相的聚集行为以及pH值、溶剂极性、浓度、温度和抗衡离子等因素对聚集行为的影响。

关键词： C60 双亲性聚集

Transcriptomic profiling of bovine mammary epithelial cells exposure to Staphylococcus aureus

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Transcriptomic profiling of bovine mammary epithelial cells ...

SemreX中基于语义的文档参考文献元数据信息提取

中国生物化学与分子生物学会2020全国学术在线会议

作者： Xiaoou Cheng zhixin guo Xiaoru,Yang Zhigang Wang State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock School of Life SciencesInner Mongolia University

Staphylococcus aureus(***) is an important pathogen causing subclinical mastitis of dairy *** of *** by non-professional phagocytic cells is a major suspected cause of persistent and severe *** performed comparative transcriptome profiling on bovine mammary epithelial cells(BMECs) that were infected with *** and untreated cells.A total of 608 differentially expressed genes(DEGs) appeared between untreated and *** infected *** on our quantitative transcriptomic analysis,60 significant DEGs with important function were related to cell adhesion,endocytosis,Staphylococcus aureus infection,Bacterial invasion of epithelial cells and PI3 K/Akt *** validate the translational significance of the findings in certain differentially expressed genes,PI3 K/Akt signaling were detected by western blot,and these two proteins showed a differential expression between nontreated and treated with *** *** induces transcriptomic changes,and PI3 K/Akt signaling might have significant function in bacteria invasion in *** RNA-seq data provides a valuable resource for the systematical profiling of *** infected on BMECs.

关键词： RNA-seq S.aureus BEMCs PI3K/Akt signaling

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计算机研究与发展 2006年第8期43卷 1368-1374页

作者：郭志鑫金海陈汉华华中科技大学计算机科学与技术学院武汉430074

为了实现科研工作者之间的文献知识的共享,结合语义网技术,提出了一种从文档中提取参考文献元数据信息的方法·该方法采用模式匹配方式,可以从文档中提取作者、标题、出版时间、期刊名等信息,并使用OWL本体描述语言进行形式化,为进一步... 详细信息

为了实现科研工作者之间的文献知识的共享,结合语义网技术,提出了一种从文档中提取参考文献元数据信息的方法·该方法采用模式匹配方式,可以从文档中提取作者、标题、出版时间、期刊名等信息,并使用OWL本体描述语言进行形式化,为进一步的语义搜索奠定基础·实验数据证明了该方法的有效性·

关键词：信息提取语义网本体模式匹配