检索结果-南通市图书馆

Possible Involvement of Anti-Oxidant Enzymes in the Cross-Tolerance of the Germination/Growth of Wheat Seeds to Salinity and Heat Stress

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2005年第10期47卷 1211-1219页

作者： Yan-Bao LEI Song-quan SONG Jia-Rui fu Xishuangbanna Tropical Botanical Garden the Chinese Academy of Sciences Yunnan 666303 China School of Life Sciences Sun Yat-Sen University Guangzhou 510275 China

The germination/growth of wheat （Triticum aestivum L. cv. Zimai 1） seeds and changes in the activities of superoxide dismutase （SOD）, ascorbate peroxidase （APX）, and catalase （CAT）, as well as in the content of thiobarbituric acid-reactive substances （TBARS）, in response to salt and heat stress, as well as cross-stress, were investigated in the present study. With increasing temperature and decreasing water potential caused by NaCI solution, the germination percentage of seeds and the fresh weight of seedlings decreased markedly, SOD activity increased, activities of APX and CAT decreased distinctly, and the TBARS content increased gradually. Seeds pretreated at 33℃ for different times displayed increased tolerance to subsequent salt stress, enhanced SOD, APX, and CAT activities, and decreased TBARS content. Seeds pretreated at -0.8 MPa NaCI for different times displayed increased tolerance to subsequent heat stress and marked increases in SOD, APX, and CAT activities, which were associated with decreased TBARS content. It is considered that the common component in the cross-tolerance of the germination and growth of wheat seeds to salinity and heat stress is the anti-oxidant enzyme system.

关键词： anti-oxidant enzymes cross tolerance germination growth heat stress salinity stress Triticum aestivum seeds.

Stress regulation of photosynthetic system of Phaeocystis globosa and their hemolytic activity

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

Journal of Oceanology and Limnology 2022年第6期40卷 2164-2177页

作者： ni WU Suping fu Xinru SONG Mengmeng TONG Tianjiu JIANG Key Laboratory of Aquatic Eutrophication and Control of Harmful Algal Blooms of Guangdong Higher Education Institute Research Center of HydrobiologyJinan UniversityGuangzhou 510632China South China Sea Institute of Planning and Environmental Research State Oceanic AdministrationGuangzhou 510300China Ocean College Zhejiang UniversityZhoushan 316021China

Blooms of Phaeocystis globosa have been reported accountable for massive fi sh mortality *** toxigenic mechanisms of ***,however,remain largely unclear due to the multiple structures and/or synergistic or antagonistic ef fects of hemolytic *** stressors could lead to the regulation of photoprotective or antioxidative defense system,as well as the potential hemolytic ***,the light-induced photosynthetic system,including the accessory photosynthetic growth,the relative electron transfer rate(ETR),photosynthetic e ffi ciency(F_(v)/F_(m)),quantum yield of photosystem II(Yield),together with the hemolytic activity of *** were investigated under variable environmental conditions in the present *** confirmed that hemolytic activity of *** was initiated by the light,but inhibited by low temperature(16℃),high light intensity(>100μmol/(m^(2)·s)),and iron-limited ***,the hemolytic activity was not impacted by photosynthetic electron inhibitors(Diuron,atrazine,paraquat,and dibromothymoquinone),which signifi cantly inhibited the photosynthetic activity of *** correlated response of hemolytic and photosynthetic activity of *** under those environmental factors suggested that the hemolytic compounds of *** would be involved in the photosynthetic process but not in the electron transfer chain of ***.

关键词： Phaeocystis globosa hemolytic activity photosynthetic system

Research on mechanism of mountain landslide due to underground mining

在线全文

学校读者我要写书评

暂无评论

Journal of Coal Science & Engineering(China) 2009年第4期15卷 351-354页

作者： TANG fu-quan College of Geomatics Xi＇an University of Science and Technology Xi＇an 710054 China

The basics of mining landslides were first summed up based on the analysis ofactual materials by the application of mining subsidence and landslide theories. further,the mechanism of along-layer landslide by mining was studied with the example of theXiangshan mining landslide at Hancheng, Shaanxi Province. Meanwhile, the state ofstress, and the mechanism of deformation and destruction of the Xiangshan mining slopewere analyzed by the Finite Element Method.

关键词： mountain landslide underground mining stability of slope mechanism of landslide weak intercalated bed

Non-storm erosion of MeV electron outer radiation belt down to L^(*)<4.0 associated with successive enhancements of solar wind density

在线全文

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2021年第6期5卷 581-591页

作者： Ying Xiong Lun Xie SuiYan fu BinBin ni ZuYin Pu School of Earth and Space Science Peking UniversityBeijing 100871China Department of Earth and Space Sciences Southern University of Science and TechnologyShenzhen 518055China Department of Space Physics School of Electronic InformationWuhan UniversityWuhan 430072China

We report an unusual non-storm erosion event of outer zone MeV electron distribution during three successive solar wind number density enhancements(SWDEs)on November 27-30,*** of MeV electrons and energy-dependent narrowing of electron pitch angle distributions(PAD)first developed at L^(*)=5.5 and then moved down to L^(*)4 during SWDE1 are mainly due to outward radial *** during SWDE2&3,scattering loss due to EMIC waves is dominant at 4fusion is the primary loss mechanism throughout all SWDEs which is consistent with the incursion of the Last Closed Drift Shell(LCDS).The inner edge of EMIC wave activity moved from L^(*)~5 to L^(*)~4 and from L~6.4 to L~4.2 from SWDE1 to SWDE2&3,respectively,observed by Van Allen Probes and by ground *** is consistent with the inward penetration of anisotropic energetic protons from L^(*)=4.5 to L^(*)=3.5,suggesting that the inward extension of EMIC waves may be driven by the inward injection of anisotropic energetic protons from the dense plasma sheet.

关键词： solar wind density enhancement outer radiation belt MeV electrons outward radial diffusion EMIC wave scattering loss

Improved fault location method for AT traction power network based on EMU load test

在线全文

学校读者我要写书评

暂无评论

Railway Engineering Science 2022年第4期30卷 532-540页

作者： Guosong Lin Xuguo fu Wei quan Bin Hong School of Electrical Engineering Southwest Jiaotong UniversityChengdu 611756China

The autotransformer(AT)neutral current ratio method is widely used for fault location in the AT traction power *** the development of high-speed electrified railways,a large number of data show that the relation between the AT neutral current ratio and the distance from the beginning of the fault AT section to the fault point(Q-L relation)is mostly ***,the linear Q-L relation in the traditional fault location method always leads to large *** solve this problem,a large number of load-related current data that can be used to describe the Q-L relation are obtained through the load test of the electric multiple unit(EMU).Thus,an improved fault location method based on the back propagation(BP)neural network is proposed in this *** this basis,a comparison between the improved method and the traditional method shows that the maximum absolute error and the average absolute error of the improved method are 0.651 km and 0.334 km lower than those of the traditional method,respectively,which demonstrates that the improved method can effectively eliminate the influence of nonlinear factors and greatly improve the accuracy of fault location for the AT traction power ***,combined with a shortcircuit test,the accuracy of the improved method is verified.

关键词： Fault location EMU load test BP neural network AT traction power network High-speed electrified railway

Integrated linkage mapping and genome-wide association study to dissect the genetic basis of zinc deficiency tolerance in maize at seedling stage

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2022年第6期10卷 1807-1818页

作者： Jianqin Xu Zhongfu ni Fanjun Chen Xiuyi fu futong Yu Key Laboratory of Plant-Soil Interaction(MOE) Centre for ResourcesEnvironment and Food SecurityCollege of Resources and Environmental SciencesChina Agricultural UniversityBeijing 100193China State Key Laboratory for Agrobiotechnology Key Laboratory of Crop Heterosis and Utilization(MOE)Beijing Key Laboratory of Crop Genetic ImprovementChina Agricultural UniversityBeijing 100193China National Maize Improvement Center of China Beijing Key Laboratory of Crop Genetic ImprovementChina Agricultural UniversityBeijing 100193China

Zinc(Zn)deficiency is the most widespread micronutrient deficiency,affecting yield and quality of crops *** genes associated with Zn-deficiency tolerance in maize is a basis for elucidating its genetic mechanism.A K22×CI7 recombinant inbred population consisting of 210 lines and an association panel of 508 lines were used to identify genetic loci influencing Zn-deficiency ***-Zn and-Zn/CK conditions,15 quantitative trait loci(QTL)were detected,each explaining 5.7%-12.6%of phenotypic ***-one significant single-nucleotide polymorphisms(SNPs)were identified at Pnificant SNPs,12 were associated with Zn-deficiency *** these candidate genes,four genes associated with hormone signaling in response to Zn-deficiency stress were co-localized with QTL or SNPs,including the genes involved in the auxin(ZmARF7),and ethylene(ZmETR5,ZmESR14,and ZmEIN2)signaling *** candidate genes were identified as being responsible for Zn transport,including ZmNAS3 detected by GWAS,ZmVIT and ZmYSL11 detected by QTL *** of ZmYSL11 was up-regulated in Zn-deficient *** candidate genes that displayed different expression patterns in response to Zn deficiency were detected in the regions overlapping peak GWAS signals,and the haplotypes for each candidate gene were further analyzed.

关键词： Maize(Zea mays L.) quantitative trait loci(QTL) Genome-wide association study(GWAS) Zinc(Zn)deficiency tolerance Candidate genes

Mining subsidence monitoring using the method of combining InSAR and GPS technology

在线全文

学校读者我要写书评

暂无评论

Journal of Coal Science & Engineering(China) 2011年第2期17卷 133-136页

作者： TANG fu-quan College of Geomatics Xi＇an University of Science and Technology Xi＇an 710054 China

Attempted to conduct a dynamic monitoring research on coal mining subsidence in western mining areas by using the method of combining D-InSAR and GPS technology. The observation points were installed on the main section and the three-dimensional coordinates of the points were measured by using the method of dynamic differential GPS. Meanwhile, the radar images of this subsidence area were processed by using the method of interferometry with daris software, and the interferogram of the subsidence area was obtained. Through this study, the GPS monitoring data and the InSAR deformation data were integrated and the dynamic subsidence contours of the experimental area were obtained. GPS/InSAR fusion technology provides a new technological means for large-scale dynamic monitoring of coal mining subsidence in western mountainous mining areas and shows good application prospects in coal mining subsidence monitoring and disaster warning.

关键词： InSAR technology GPS technology Mining subsidence dynamic monitoring

Historic and future Perspectives of Storm and Cyclone

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

Advances in Atmospheric Sciences 2023年第3期40卷 447-463页

作者： Gang fu Pengyuan LI Lijia CHEN Yongmao PENG Jing ni Department of Marine Meteorology Ocean-Atmosphere Interaction and Climate LaboratoryKey Laboratory of Physical OceanographyOcean University of ChinaQingdao 266100China Division of Oceanic Dynamics and Climate Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266000China

In weather sciences,the two specific terms“storm”and“cyclone”frequently appear in literature and usually refer to the violent nature of a number of weather systems characterized by central low pressure,strong winds,large precipitation amounts in the form of rain,freezing rain,or snow,as well as thunder and *** what is the connection between these two specific terms?In this paper,the historic evolutions of the terms“storm”and“cyclone”are reviewed from the perspective of weather *** earliest recorded storms in world history are also briefly ***,the origin of the term“meteorological bomb”,which is the nickname of the“explosive cyclone”is ***,the various definitions of explosive cyclones given by several researchers are ***,the climatological features of explosive cyclones,as well as the future trends of explosive cyclones under global climate change,are discussed.

关键词： weather sciences storm and cyclone the origin of explosive cyclone climatological features global climate change future trends

NUMERICAL SIMULATIONS OF VISCOELASTIC FLOWS THROUGH ONE SLOT CHANNEL

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2007年第2期19卷 210-216页

作者： YIN Hong-jun ZHONG Hui-ying fu Chun-quan WANG Lei Key Laboratory of Enhanced Oil and Gas Recovery of Ministry of Education Daqing Petroleum Institute Daqing 163318 China Oil Recovery Plant No. 1 Daqing Oilfield Corp. Ltd. Daqing 163001 China

In this article, the Modified Upper-Convected Maxwell equation （MUCM） is proposed. The viscoelastic polymer solution flow characteristics are described by the numerical method. The stream function contour, velocity contour and stress modulus contour of fluid in slot channel are drawn. The non-Newtonian power law property and viscoelasticity of MUCM fluid influence on the stream function are analyzed. The velocity contour move towards dead oil area with the viscoelasticity increase, flow area increase and the sweep area enlarges, so the sweep efficiency is enhanced.

关键词： viscoelastic fluid Modified Upper-ConvectedMaxwell (MUCM) constitutive equation power law exponent,Weissenberg number