检索结果-南通市图书馆

aBIOTECH 2023年第2期4卷 155-171页

作者： Kun Luo Jiao Guo Dejia He Guangwei Li Thérèse Ouellet Shaanxi Key Laboratory of Chinese Jujube College of Life ScienceYan’an UniversityYan’an716000China Ottawa research and Development Centre Agriculture and Agri-Food Canada960 Carling AveOttawaONK1A 0C6Canada

Deoxynivalenol(DON)is a prominent mycotoxin showing significant accumulation in cereal plants during infection by the phytopathogen Fusarium *** is a virulence factor that is important in the spread of *** within cereal heads,and it causes serious yield losses and significant contamination of cereal *** recent decades,genetic and genomic studies have facilitated the characterization of the molecular pathways of DON biosynthesis in *** and the environmental factors that influence DON *** addition,diverse scab resistance traits related to the repression of DON accumulation in plants have been identified,and experimental studies of wheat–pathogen interactions have contributed to understanding detoxification mechanisms in host *** present review illustrates and summarizes the molecular networks of DON mycotoxin production in *** and the methods of DON detoxification in plants based on the current literature,which provides molecular targets for crop improvement *** review also comprehensively discusses recent advances and challenges related to genetic engineering-mediated cultivar improvements to strengthen scab ***,ongoing advancements in genetic engineering will enable the application of these molecular targets to develop more scab-resistant wheat cultivars with DON detoxification traits.

关键词： Mycotoxin biosynthesis Antioxidant enzymes Detoxification enzymes Scab resistance Transgenic breeding

Structural, Optical and Luminescence Properties of ZnO Thin Films Prepared by Sol-Gel Spin-Coating Method： Effect of Precursor Concentration

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 Physics Letters 2018年第1期35卷 63-67页

作者： r.Amari A.Mahroug A.Boukhari B.Deghfel N.Selmi Laboratory of Materials Physics and Its Applications Department of Physics Faculty of Sciences University of Mohamed Boudiaf M'sila 28000 Algeria Department of Physics Faculty of Sciences University of Mohamed Boudiaf M'sila 28000 Algeria Nuclear research Center of Birine Ain Oussera Box 180 Algeria

Transparent zinc oxide（ZnO） thin films are fabricated by a simple sol-gel spin-coating technique on glass substrates with different solution concentrations（0.3-1.2 M） using zinc acetate dehydrate [Zn（CH_3COO）_2·2H_2O] as precursor and isopropanol and monoethanolamine（MEA） as solvent and stabilizer, respectively. The molar ratio of zinc acetate dehydrate to MEA is 1.0. X-ray diffraction, ultraviolet-visible spectroscopy and photoluminescence spectroscopy are employed to investigate the effect of solution concentration on the structural and optical properties of the ZnO thin films. The obtained results of all thin films are discussed in detail and are compared with other experimental data.

关键词： ZnO Optical and Luminescence Properties of ZnO Thin Films Prepared by Sol-Gel Spin-Coating Method Structural

New experimental study on the DC flashover voltage of polymer insulators:combined effect of surface charges and air humidity

在线全文

学校读者我要写书评

暂无评论

High Voltage 2019年第4期4卷 316-323页

作者： Mohammed Amer Jeff Laninga William McDermid David r.Swatek Behzad Kordi Department of Electrical and Computer Engineering University of Manitoba75 Chancellor's CircleWinnipegManitobaCanada R3T 5V6 Manitoba Hydro WinnipegManitobaCanada R3M 3T1

This research provides conclusions that can partially cover the lack of knowledge related to the effects of ambient atmospheric conditions on DC electric power *** polymer insulating materials are used for completing this research *** a climate chamber,the relative humidity is controlled and adjusted from 20%to 80%***,the samples are charged with positive or negative charges by applying±20 kV to the corona-generating ring of *** surface potential is measured using an electrostatic voltmeter and is converted into surface charge density later by applying the probe response matrix *** pre-charged samples are then stressed with high-voltage negative or positive DC values inside the climate chamber over a range of controlled values of the surrounding air humidity until flashover takes *** space charges,which can drift in the air gap to reach the solid surface,are highly affected by the level of the relative humidity of the surrounding ***,increasing humidity results in a reduction of the DC flashover inception voltage and a shorter time to flashover regardless of the voltage ***,the positive or negative flashover inception voltage of both materials increases with pre-deposited negative charges while it decreases with pre-deposited positive charges.

关键词： charges flash humidity

Microenvironmental influences on T cell immunity in cancer and inflammation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2022年第3期19卷 316-326页

作者： Darren r.Heintzman Emilie L.Fisher Jeffrey C.rathmell Department of Pathology Microbiologyand ImmunologyVanderbilt University Medical CenterNashvilleTN37205USA Vanderbilt Center for Immunobiology Vanderbilt University Medical CenterNashvilleTN37205USA

T cell metabolism is dynamic and highly *** the intrinsic metabolic programs of T cell subsets are integral to their distinct differentiation and functional patterns,the ability of cells to acquire nutrients and cope with hostile microenvironments can limit these pathways.T cells must function in a wide variety of tissue settings,and how T cells interpret these signals to maintain an appropriate metabolic program for their demands or if metabolic mechanisms of immune suppression restrain immunity is an area of growing *** in inflamed and cancer tissues,a wide range of changes in physical conditions and nutrient availability are now acknowledged to shape *** include fever and increased temperatures,depletion of critical micro and macro-nutrients,and accumulation of inhibitory waste *** we review several of these factors and how the tissue microenvironment both shapes and constrains immunity.

关键词： immunometabolism T cell microenvironment cancer inflammation

ZrB_(2)-SiC based composites for thermal protection by reaction sintering of ZrO_(2)+B_(4)C+Si

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 Advanced Ceramics 2017年第4期6卷 320-329页

作者： r.V.KrISHNArAO V.V.BHANUPrASAD G.MADHUSUDHAN rEDDY Defence Metallurgical research Laboratory KanchanbaghHyderabad-500058India

Synthesis and sintering of ZrB_(2)-SiC based composites have been carried out in a single-step pressureless reaction sintering(PLrS)of ZrO_(2),B_(4)C,and Si.Y_(2)O_(3) and Al_(2)O_(3) were used as sintering *** effect of ratios of ZrO_(2)/B_(4)C,ZrO_(2)/Si,and sintering additives(Y_(2)O_(3) and Al_(2)O_(3)),was studied by sintering at different temperatures between 1500 and 1680℃in argon ***_(2),SiC,and YAG phases were identified in the sintered *** as high as 4.2 g/cm^(3),micro hardness of 12.7 GPa,and flexural strength of 117.6 MPa were obtained for PLrS *** material was also prepared by PLrS for tungsten inert gas(TIG)welding of the ZrB_(2)-SiC based *** shear strength of the weld was 63.5 *** PLrS ZrB_(2)-SiC composites exhibited:(i)resistance to oxidation and thermal shock upon exposure to plasma flame at 2700℃for 600 s,(ii)thermal protection for Cf-SiC composites upon exposure to oxy-propane flame at 2300℃for 600 s.

关键词： ZrB_(2) SiC reactive sintering synthesis composites

SYNTHESIS AND IDENTIFICATION OF CONDUCTING POLYANILINE DOPED WITH rArE EArTH CHLOrIDE

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2000年第3期13卷 872-876页

作者： Yang, C.M. Zhang, Q.r. Fang, Z. Central South Univ of Technology Changsha China

Polyaniline doped with rare earth chloride was synthesized in organic solvent and identified by elemental analysis and infrared spectroscopy. The experimental results show that there exists both doping and complexation at the same time in the resulting product. When pH4. Moreover, polyaniline doped with rare earth chloride exhibits better thermal stability than that doped with hydrochloric acid.

关键词： Chlorine compounds Composition Conductive materials Electric conductivity Organic polymers rare earth compounds Synthesis (chemical)

Distributed Secure Storage Scheme Based on Sharding Blockchain

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第3期70卷 4485-4502页

作者： Jin Wang Chenchen Han Xiaofeng Yu Yongjun ren r.Simon Sherratt School of Computer Science and Mathematics Fujian University of TechnologyFuzhou350118China School of Computer&Communication Engineering Changsha University of Science&TechnologyChangsha410004China School of Business Nanjing UniversityNanjing210093China School of Computer School of SoftwareSchool of Cyberspace SecurityEngineering Research Center of Digital ForensicsMinistry of EducationNanjing University of Information Science&TechnologyNanjing210044China Department of Biomedical Engineering University of ReadingRG66AYUK

Distributed storage can store data in multiple devices or servers to improve data ***,in today’s explosive growth of network data,traditional distributed storage scheme is faced with some severe challenges such as insufficient performance,data tampering,and data lose.A distributed storage scheme based on blockchain has been proposed to improve security and efficiency of traditional distributed *** this scheme,the following improvements have been made in this *** paper first analyzes the problems faced by distributed *** proposed to build a new distributed storage blockchain scheme with sharding *** proposed scheme realizes the partitioning of the network and nodes by means of blockchain sharding technology,which can improve the efficiency of data verification between *** addition,this paper uses polynomial commitment to construct a new verifiable secret share scheme called *** new scheme is one of the foundations for building our improved distributed storage blockchain *** with the previous scheme,our new scheme does not require a trusted third party and has some new features such as homomorphic and batch *** security of VSS can be further *** comparisons show that the proposed scheme significantly reduces storage and communication costs.

关键词： Blockchain distributed storage verifiable secret share polynomial commitment

The reproductive biology of a Central American cichlid Neetroplus nematopus in Lake Xiloá ,Nicaragua

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Current Zoology 2010年第1期56卷 43-51页

作者： Kenneth r.McKAYE Jeremy HALE Eric P.van den BErGHE World Wide Fund for Nature Finland Universidad de Centroamericana Department of Mathematics Science and Technology Ave Maria University Latin American Campus

This study was conducted to provide a five-year database on the breeding seasonality and breeding biology of a Central American cichlid fish Neetroplus nematopus, a biparental substratum-spawning cichlid that cares for its eggs, wrigglers, and fry for up to six weeks. A total of 503 breeding pairs were monitored for breeding success. Breeding pairs of N. nematopus are sexually dimorphic in size, with females averaging 39% of male body mass. Fry emerged from 85% of nesting cavities. After three weeks, only 30% of the broods were present in the nesting cavity; these broods had a 30% survival rate, giving a 9% overall survival rate. Nineteen percent of the successful parents with three-week-old broods adopted foreign fry. A consistent unimodal breeding peak in December was observed for five years. This breeding peak differed dramatically from the bimodal breeding season 20 years found in the 1970s. The effects of extensive grenade fishing practices during the 1980s might have played a substantial role in the observed change. Grenade fishing stopped in 1991, and the number ofN. nematopus pairs increased by 136% from 1990 to 1995. With increased density of breeding fish, the breeding season for this species also expanded. The balance between divergent selection due to competition for breeding sites and stabilizing selection due to predation pressure on offspring is likely to mold the breeding season for N. nematopus and other cichlids of Lake Xilofi. We suggest that brood adoption and synchrony of breeding is a strategy to reduce predation on the parent＇s own young [Current Zoology 56 （1）： 43-51 2010].

关键词： Nicaragua Cichlids Breeding reproduction Synchrony Seasonality

Effects of Isotopic Concentrations on Thermodynamic Parameters of Deuterium-Tritium Mixtures

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2013年第7期60卷 108-112页

作者： S.M. Motevalli M.r. Pahlavani M. Azimi Department of Nuclear Physics Faculty of Science University of Mazandaran

Thermodynamic estimation is still too much requested for scientific applications in spite of great advances in simulation methods for efficient determination of phase equilibrium of multi-component systems. In this work, thermodynamic properties of deuterium-tritium mixture in a wide range of temperatures and pressures have been predicted. Buckingham exp-6 potential has been utilized in calculations, based on statistical perturbation theory. The effects of various values of density, temperature and isotopic concentrations on pressure have been studied. Eventually, we have found out symmetrical effects of tritium concentration in deuterium-tritium mixtures.

关键词： Deuterium-tritium mixture thermodynamic property buckingham exp-6 potential Tritium concentration

Competition and abiotic stress affect the size of mangroves near their geographic range limit

在线全文

学校读者我要写书评

暂无评论

Journal of Plant Ecology 2022年第1期15卷 129-140页

作者： Dan Peng Hongyu Guo Anna r.Armitage Steven C.Pennings Department of Biology and Biochemistry University of HoustonHoustonTX 77204USA Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems College of the Environment and EcologyXiamen UniversityXiamen 361102China Tianjin Key Laboratory of Animal and Plant resistance College of Life SciencesTianjin Normal UniversityTianjin 300387China Department of Marine Biology Texas A&M University at GalvestonGalvestonTX 77553USA

Studies of competition in mangroves are mostly limited to seedlings and artificial settings like forestry *** conducted the first experimental study of intraspecific competition among adult mangroves in a natural mangrove forest to examine how important competition is in determining tree size compared with abiotic *** conducted a study near Port Aransas,TX,USA,which is near the geographical limit of mangroves and dominated by monospecific stands of‘scrub’form black mangroves,Avicennia *** thinned 10 plots to create a gradient of mangrove cover,and quantified the effects of mangrove cover on the growth of tagged mangroves from 2013 to 2019,and the mangrove canopy height in *** relative growth rate of tagged mangroves declined as mangrove cover increased,and plants in the plot with 100%mangrove cover did not grow,indicating that they had attained their maximum *** plots with reduced mangrove cover,plant height increased sharply,with plants in the plot with 11%mangrove cover growing~52%taller over 6 *** height was~30%taller in the plot fringe than in the interior,and canopy height in both fringe and interior declined as mangrove cover *** of leaf chlorophyll concentration and light interception suggested that plants were primarily limited by *** results showed that scrub mangroves compete strongly despite being limited by abiotic conditions,and that the importance of competition was greater in magnitude than that of abiotic differences between the fringe and interior.

关键词： competition adult mangrove nutrient limitation growth response scrub mangrove geographical limit