检索结果-南通市图书馆

Journal of Integrative Plant Biology 2011年第1期53卷 7-13页

作者： yan Zhu Jianfei Lu Jing Wang Fu Chen Feifan leng Hongyu Li MOE Key Laboratory of Arid and Grassland Ecology School of Life Sciences Lanz-hou University Lanzhou 730000 China College of Food Science and Engineering Gansu Agriculture University Lanzhou 730070 China Institute of Potato Gansu Academy of Agricultural Sciences Lanzhou 730070 China

Thermogenesis is a process of heat production in living organisms. It is rare in plants, but it does occur in some species of angiosperm. The heat is generated via plant mitochondrial respiration. As possible involvement in thermogenesis of mitochondrial factors, alternative ox- idases （AOXs） and plant uncoupling mitochondrial proteins （PUMPs） have been well studied. AOXs and PUMPs are ubiquitously present in the inner membrane of plant mitochondria. They serve as two major energy dissipation systems that balance mitochondrial respiration and uncoupled phosphorylation by dissipating the H~ redox energy and proton electrochemical gradient （A#H~） as heat, respectively. AOXs and PUMPs exert similar physiological functions during homeothermic heat production in thermogenic plants. AOXs have five isoforms, while PUMPs have six. Both AOXs and PUMPs are encoded by small nuclear multigene families. Multiple isoforms are expressed in different tissues or *** studies have been done in the area of thermogenesis in higher plants. In this review, we focus on the involvement and regulation of AOXs and PUMPs in thermogenesis.

关键词： Thermoregulation Plants Planting Organizations Production Productivity Products Heat Heating Energy

Origin of a giant fuzzy reflection zone and its implication for natural gas exploration in the southwestern Qiongdongnan Basin of the South China Sea

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2023年第2期41卷 710-728页

作者： Junhui YU Pin yan yanlin WANG yan qiu Guanghong TU Changliang CHEN Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyInnovation Academy of South China Sea Ecology and Environmental EngineeringChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China Key Laboratory of Marine Mineral Resources Guangzhou Marine Geological SurveyChina Geological SurveyMinistry of Natural ResourcesGuangzhou 511458China University of Chinese Academy of Sciences Beijing 100049China

The southwestern depression of the Qiongdongnan Basin(QDNB)hosts thick Cenozoic sediments and awaits major hydrocarbon *** seismic(MCS)profile CFT2011 across the southwestern QDNB reveals a~60-km-wide fuzzy reflection zone(FRZ)within the sediments,but its origin and distribution remain *** ocean bottom seismometer(OBS)data of Line CFT2011 are processed with focus on the velocity structures by traveltime tomography inversion and analyzed together with the coincident and adjacent MCS *** OBS velocity results show that the giant FRZ features lower velocity with difference up to 1.5 km/s and smaller vertical velocity gradient than the surrounding sedimentary sequences at the same depth,likely resulting from enhanced fluid *** MCS profile exhibits that the giant FRZ is about 3-9-km thick and extends from the Paleogene strata rich in organic matters upward to the lower Pleistocene *** the shallow overlying sediments,multiple bright spots with reverse polarity are imaged and their reflection amplitudes increase with offset,consistent with the features of gas-charged *** are probably shallow gas reservoirs with gases sourced from the deep ***,the FRZ is proposed to be a giant gas-charged zone,which probably contains lots of hydrocarbon gases migrated vertically from the deep Paleogene source rocks through the boundary faults of the depressions and the minor fractures generated under *** FRZ is also imaged on the adjacent MCS profiles MCS-L1 and MCS-L2 with the width of about 40 km and 68 km,*** is roughly estimated to cover an area of~1900 km2 and host a volume of~11400 km3 assuming an average thickness of 6 km,implying huge natural gas potential in the sedimentary depression of the southwestern QDNB of the South China Sea.

关键词： southwestern Qiongdongnan Basin fuzzy reflection zone low velocity gas charging natural gas potential

Neighbor Sum Distinguishing Colorings of Graphs with Maximum Average Degree Less Than 37/12

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2018年第2期34卷 265-274页

作者： Bao Jian qiu Ji Hui WANG yan LIU School of Mathematical Sciences University of Jinan

Let G be a graph and let its maxiraum degree and maximum average degree be denoted by △（G） and mad（G）, respectively. A neighbor sum distinguishing k-edge colorings of graph G is a proper k-edge coloring of graph G such that, for any edge uv ∈ E（G）, the sum of colors assigned on incident edges of u is different from the sum of colors assigned on incident edges of v. The smallest value of k in such a coloring of G is denoted by X∑ （G）. Flandrin et al. proposed the following conjecture that X＇∑ （G） ≤△ （G）＋ 2 for any connected graph with at least 3 vertices and G ≠ C5. In this paper, we prove that the conjecture holds for a normal graph with mad（G）〈 37/12and △ （G）≥ 7.

关键词： Neighbor sum distinguishing coloring combinatorial nullstellensatz maximum average degree proper colorings

An Anomalous Seamount on the Southwestern Mid-Ridge of the South China Sea

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2017年第6期91卷 2340-2341页

作者： WANG yanlin WANG Jun yan Pin qiu yan CAS Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyCAS Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and Technology Guangzhou Marine Geological Survey

Objective The development of continental rifting and seafloor spreading can be predominated by magmatic upwelling （magma-rich） or tectonic stretching （magma-poor）. Located in the terminal portion of propagating seafloor spreading of the South China Sea （SCS）, the southwestern mid-ridge of the southwest sub-basin （SWSB） of the SCS was found with much thin crust and numerous faulted blocks coupling with magma-poor continental margins along its flanks. Therefore, the southwestern part of the SWSB is most likely to be a tectonic-dominated basin. To justify the hypothesis with further evidence, we investigated the nature of seamounts on the southwestern mid-ridge of the SWSB which may inherit seafloor spreading.

关键词： Southwestern Mid-Ridge the South China Sea

Expression and significance of netrin-1 and its receptor UNC5C in precocious puberty female rat hypothalamus

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2015年第3期8卷 234-238页

作者： yan-Chao Shang Jie Zhang yan-qiu Shang Maternal and Children Health Hospital Affiliated Hospital of Hebei United University

Objective:To study expressions of netrin-1 and its receptor UNC5 C in female precocious puberty rat hypothalamus,and explore its effect on precocious puberty ***:Forty female one-week-old SD rats were randomly divided into four groups:experimental group A(precocious puberty early youth),experimental group B(precocious puberty medium youth),group A(normal pre-puberty).group B(normal early youth) with 10 rats in each *** puberty experimental rats were induced with Danazol and rals in control group were injected with *** and ovaries were removed,specimens were weighed,litems index and ovarian index were calculated,and amount of luteinizing hormone(LH) and follicle-stimulating hormone(FSH) were detected from the blood by ***-time PCR was used to delect netrin-1 and its receptor UNC5 *** well as hypothalamic gonadolropinreleasing hormone(GnRH) mRNA expression in hypothalamus tissues:and then,a coimmunoprecipitation study of interactions between netrin-1 and its receptor UNC5 C was carried ***:Relative target gene expression levels of control group A,control group *** group A,and experimental group B(with,3-actin as an internal control for normalization) were as follows:Netrin-1:3.5±0.9,5.4±0.***.4.9±1.***.5.3±0.3:UNC5C:0.8±0.***.1.7±0.***.1.82±0.***.1.58±0.4:GnRH:1.2±0.***.2.7±0.***.2.4±0.***.3.2±***:LH and FSH concentrations,netrin-1 and its receptor expression are increased in precocious puberty animal models.

关键词： Netrin-1 UNC5C Central precocious puberty

Behavior of High Strength Concrete Filled Square Steel Tube Stub Columns with Inner CFRP Tube Under Biaxial Eccentric Compression

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2021年第4期127卷 273-290页

作者： Zhijian yang Guochang Li yan Lang Zengmei qiu School of Civil Engineering Shenyang Jianzhu UniversityShenyang110168China Department of Building Engineering Suqian CollegeSuqian223800China

This paper studies the contribution of CFRP(carbon fiber-reinforced polymer)to the mechanical behavior of high strength concrete-filled square steel tube(HCFST)under biaxial eccentric *** new type of composite member is composed of an inner CFRP tube and an outer steel tube with concrete filled in the two *** finite element analysis was made by ABAQUS on the behavior of high strength concrete filled square steel tubular columns with inner CFRP circular tube subjected to bi-axial eccentric *** results obtained from the finite element analysis were verified with the experimental *** addition,the load-deflection curves in the whole process were calculated and analyzed,which can be divided into three segments:Elastic phase,plastic phase,descending *** on the load-deflection curves,the stresses analysis on the core concrete,CFRP tube and steel tube were *** confinement effect of the CFRP tube improves the ductility of HCFST-CFRP stub *** ratio and eccentricity affect the ultimate bearing capacity of HCFST stub ***,a calculation formula of ultimate bearing capacity was proposed in the paper.

关键词： CFRP tube concrete-filled square steel tube high strength concrete bi-axial bending stub column

Exceptional reversed yield strength asymmetry in a rare-earth free Mg alloy containing quasicrystal precipitates

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2024年第2期12卷 687-699页

作者： Qiang yang Shuhui Lv Zixiang yan Zefeng Xie Xin qiu State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022PR China School of Materials Science and Engineering Changchun University of Science and Technology130022PR China

This work reports an exceptional reversed yield strength asymmetry at room temperature for a rare-earth free magnesium alloy containing a mass of fine dispersed quasicrystal(I-phase)*** exhibiting traditional basal texture,it owns an exceptional CYS/TYS as high as~*** back-scattered diffraction(EBSD)and transmission electron microscopy(TEM)examinations indicate pyramidal and prismatic dislocations plus tensile twinning being activated after immediate yielding in compression while basal and non-basal dislocations in tension.I-phase particles transferred the concentrated stress by self-twinning to provide the driving force for tensile twin initiating in neighboring grains,thereby significantly increasing the critical resolved shear stress of tensile twinning to possibly the level of pyramidal slip,finally leading to the dominance of pyramidal slip plus tensile twinning in texture *** results in a higher contribution on yield strength by~55 MPa in compression than in tension,which reasonably agrees with the experimental yield strength difference(~38 MPa).It can be concluded that I-phase particles influence deformation modes in tension and in compression,finally result in reversed yield strength asymmetry.

关键词： Magnesium alloy Reversed yield strength asymmetry Transmission electron microscopy(TEM) Twinning Dislocations

Fragmentation of N2 in 410 nm Intense Femtosecond Laser Field

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2009年第1期22卷 1-6页

作者： Wei Guo Jing-yi Zhu yan-qiu Wang Li Wang State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China Graduate School of Chinese Academy of Sciences Beijing 100049 China

Fragmentations of N2 in linearly polarized femtosecond 410 and 820 nm intense laser fields were studied by using the velocity mapping technique. Different behaviors of N2 at 410 and 820 nm were observed. Both the kinetic energy distributions and angular distributions of fragment ions in 410 nm field show weak dependency on laser intensities in the non- saturation regime, in contrast to the case in 820 nm. Different excited electronic states, i.e., non-Coulombic potentials populated via vertical＇excitation, are suggested to play crucial roles in fragmentations at short wavelength.

关键词： Velocity mapping Non-Coulombic fragmentation Energy distribution Angular distribution

Interaction Between Cytochrome c and the Hapten 2,4-Dinitro- fluorobenzene by Electrospray Ionization Mass Spectrometry

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 Chemical Physics 2008年第3期21卷 217-220页

作者： Bo Wu yan-qiu Chu Zhao-yun Dai Chuan-fan Ding Physical Chemistry Institute Department of Chemistry Fudan University Shanghai 200433 China Infectious Disease Department Huadong Hospital Shanghai 200040 China

Allergic contact dermatitis is a delayed hypersensitivity reaction, which results from skin exposure to low molecular weight chemicals such as haptens. To clarify the pathogenic mechanism, electrospray ionization mass spectrometry （ESI-MS） and hydrogen/deuterium （H/D） exchange, as well as UV spectroscopy, were applied to determine the interaction between the model protein cytochrome c （cyt c） and the hapten 2,4- dinitro-fiuorobenzene （DNFB）. The ESI-MS results demonstrate that the conformation of cyt c can change from native folded state into partially unfolded state with the increase of DNFB. The equilibrium state H/D exchange followed by ESI-MS further confirms the above results. UV spectroscopy indicates that the strong- field coordination between iron of heme （prosthetic group） and His18 or Met80 of cyt c is not obviously affected by the hapten.

关键词： Interaction Cytochrome c 2 4-dinitro-fluorobenzene ESI-MS

Adhesives to empower a manipulator inspired by the chameleon tongue

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 Chemical Letters 2020年第3期31卷 821-825页

作者： Chen Wang Liju Xu yan Qiao Dong qiu Beijing National Laboratory for Molecular Sciences(BNLMS) State Key Laboratory of Polymer Physics and ChemistryCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China

Existing grasping technologies have persistent challenges with unstructured objects and environments,highlighting an increasing demand for methods that conform to various application *** by the chameleon tongue,a soft-contact grasping manipulator empowered by a class of adhesive gels has been *** adhesives enable the manipulator to rapidly and strongly adhere to diverse substrates with varied surfaces,shapes and sizes,also to release objects under mild *** robustness of such adhesive gels was highlighted with the remarkable recyclability,broad temperature tolerance and long-term ***,a general approach was developed to reconcile the contradiction of simultaneously enhancing their interfacial adhesion and cohesion strength that exists in conventional *** anticipate that this work will offer a strategy of developing adhesive materials and pave the way towards new applications of soft materials in the emerging fields of soft robotic devices and smart manufacturing.

关键词： Polymer Adhesive gels Switchable adhesion Bio-inspired Manipulator