检索结果-南通市图书馆

Iridoid glycosides from fruits reduce the growth of fungi associated with fruit rot

在线全文

学校读者我要写书评

暂无评论

Journal of Plant Ecology 2016年第3期9卷 357-366页

作者： Susan r.Whitehead Jordan Tiramani M.Deane Bowers Department of Ecology and Evolutionary Biology University of Colorado BoulderBoulderCO 80309USA Department of Entomology Cornell UniversityIthacaNY 14853USA Museum of Natural History University of Colorado BoulderBoulderCO 80309USA

Aims ripe,fleshy fruits generally function as rewards to attract mutualistic seed dispersers,but many fruits also contain high concentrations of toxic secondary *** compounds may serve a variety of adaptive roles in seed dispersal or as a defense against non-dispersing seed predators or *** tested the effects of iridoid glycosides from fruits of a hybrid bush honeysuckle,Lonicera×bella,on the growth of two pathogenic fungal strains associated with fruit rot,Alternaria tenuissima and Aspergillus *** Fungi were isolated from field-collected L.×bella fruits and identified using molecular *** growth rates were assessed in vitro in the presence of varying concentrations of pure loganin,one of the most abundant iridoid glycosides in fruits,as well as fruit extracts containing a mix of at least seven different iridoid *** FindingsLoganin had strong dose-dependent negative effects on the growth of both *** from fruits had no effect on Aspergillus but a strong antifungal effect on Alternaria that increased with fruit *** iridoid glycoside concentrations in extracts were not good predictors of variation in fungal growth,but several individual compounds had significant negative *** iridoid glycosides have primarily been studied as antiherbivore defenses in leaves,these results indicate that they can also function to reduce the growth of fungi associated with fruit rot.

关键词： Caprifoliaceae fruit rot fruit secondary metabolites generalized defense Lonicera plant-pathogen interactions

The utility of metabolomics as a tool to inform maize biology

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Communications 2021年第4期2卷 66-88页

作者： David B.Medeiros Yariv Brotman Alisdair r.Fernie Max Planck Institute of Molecular Plant Physiology PotsdamGermany Department of Life Sciences Ben-Gurion University of the NegevBeershevaIsrael

With the rise of high-throughput omics tools and the importance of maize and its products as food and bioethanol,maize metabolism has been extensively *** maize is still rich in genetic and phenotypic variation,yielding a wide range of structurally and functionally *** maize metabolome is also incredibly dynamic in terms of topology and subcellular *** this review,we examine a broad range of studies that cover recent developments in maize *** attention is given to current methodologies and to the use of metabolomics as a tool to define biosynthetic pathways and address biological *** also touch upon the use of metabolomics to understand maize natural variation and evolution,with a special focus on research that has used metabolite-based genome-wide association studies(mGWASs).

关键词： GWAS metabolism metabolite profiling primary metabolites secondary metabolites Zea mays

Targeting Ageing to Decrease Complex Non-Communicable Human Diseases

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 Genetics and Genomics 2014年第9期41卷 457-458页

作者： Jing-Dong J.Han John r.Speakman Chinese Academy of Sciences Key Laboratory of Computational Biology Chinese Academy of Sciences-Max Planck Partner Institute for Computational BiologyShanghai Institutes for Biological SciencesChinese Academy of Sciences State Key Laboratory of Molecular Developmental Biology Institute of Genetics and Developmental BiologyChinese Academy of Sciences Institute of Biological and Environmental Sciences University of Aberdeen

During the last two centuries, there have been many spectacular advances in medical science, the main consequence of which has been the dramatically reduced burden of infectious diseases. While in the 1800s many people died before reaching adult- hood, nowadays most people survive. Hence average life ex- pectancy in 1800s was around 30-40, which was barely higher than it had been in Greek and roman times （Finch, 2010）, but nowadays life expectancy in most modernised economies is around 75 - 80. This demographic shift, which has happened in only 200 years, has created a dramatic change in the causes of mortality. The major killers in the modern world are non- communicable diseases （NCDs）： principally cardiovascular disease, cancer and neurodegenerative disorders such as Alz- heimer＇s disease. A major factor that influences susceptibility to all these diseases is age. As we get older, our risk of developing these NCDs increases enormously. For example, the rate of breast cancer in females at age 15-19 is less than 10 per 100,000 population, but this increases to 100 at age 40-44, 275 at age 55--59 and 450 at age 85 ＋（http：//***/ cancer-info/cancerstats/types/breast/incidence/#age）. Ageing has consequently become a major medical, social and economic burden to many countries.

关键词： Targeting Ageing to Decrease Complex Non-Communicable Human Diseases

Immunological characterization of recombinant Wuchereria bancrofti cuticular collagen(COL-4)as putative vaccine candidate for human lymphatic filariasis

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2014年第7期7卷 505-512页

作者： Chakkaravarthy Arunkumar Pandurangan Pandiaraja P.r.Prince Perumal Kaliraj Centre for Biotechnology Anna University

Objective:To elucidate immunoprophylactic potential of recombinant Wuchereria bancrofti(***)cuticular collagen(COL-4)in BALB/c mice and filarial clinical ***:col-4 gene was PCr amplified from *** L3 cDNA library and cloned in prSET B *** COL-4 was over expressed in salt inducible system and was purified by nickel afiinity *** and cellular responses were measured by EUSA and peripheral blood mononuclear cells(PBMC)of various filarial clinical samples respectively using purified recombinant COL-4 *** the protective immune responses of COL-4 immunized BALB/c mice were ***:Sequence analysis of COL-4 with human host proteins reveals lack of *** recombinant COL-4 was found to be at 15 kDa fusion *** affinity purified COL-4 showed significant reactivity with putatively immune sere and in a similar fashion it demonstrated marked proliferation in PBMC *** studies in experimental filarial host(mice)elicited significant liters with protective antibody isotype profile(IgM and IgG).Cellular immune responses were also significant in terms of splenocytes proliferation assay on mice ***:Our immunological findings in experimental host suggest Th2mediated immune ***,we propose that *** COL-4 could be an efficacious vaccine candidate against lymphatic filariasis.

关键词： Lymphatic filariasis Wuchereria banerofti Cuticular collagen Vaccine

Performance prediction of switched reluctance generator with time average and small signal models

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers in Energy 2013年第1期7卷 56-68页

作者： Jyoti KOUJALAGI B. UMAMAHESWArI r. ArUMUGAM Department of Electrical Engineering Dr. Ambedkar Institute of Technology Bangalore 560056 India Department of Electrical Engineering CEG Campus Anna University Chennai 600025 India Department of Electrical Engineering SSN Engineering of CollegeChennai 603110 India

This paper presents the complete mathematical model and predicts the performance of switched reluctance generator with time average and small signal models. The complete mathematical model is developed in three stages. First, a switching model is developed based on quasi-linear inductance profile. Next, based on the switching behaviour, a time average model is obtained to measure the difference between the excitation and generation time in each switching cycle. Finally, to track control voltage and current wave shapes, a small signal model is designed. The effectiveness of the complete multilevel model combining electrical machine, power converter, load and control with programming language is demonstrated through simulations. A PI controller is used for controlling the voltage of the generator. The results presented show that the controller exhibits accurate tracking control of load voltage under different operating conditions. This demonstrates that the proposed model is able to perform an accurate control of the generated output voltage even in transient situations. The simulation is performed to choose the control parameters and study the performance of switched reluctance generator prior to its actual implementation. Initial experimental results are presented using NI-Data acquisition card to control the output power according to load requirements.

关键词： generator reluctance switching model small signal model time average model

通过人工神经网络的建模和预测手段开展使用ENi-P-纳米二氧化钛复合涂层对AH36钢进行表面改性研究

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 Marine Science and Application 2022年第3期21卷 193-203页

作者： r Anthoni Sagaya Selvan Dinesh G.Thakur M.Seeman Mahesh Naik Department of Mechanical Engineering DIAT(DU)Pune-411025India Centre for Materials Joining and research(CEMAJOr) Department of Manufacturing EngineeringAnnamalai UniversityAnnamalai Nagar-608002India

This study aims to analyse and forecast the significance of input process parameters to obtain a better ENi-P-TiO_(2) coated surface using artificial neural networks(ANN).By varying the four process parameters with the Taguchi L9 design,fortyfive numbers of AH36 steel specimens are coated with ENi-P-TiO_(2) composites,and their microhardness values are *** ANN model was formulated using the input and output data obtained from the 45 *** optimal design was developed based on mean squared error(MSE)and r2 *** experimentally measured values were compared with their predicted values to determine the ANN model’s *** efficiency of the ANN model is evaluated with an r2 value of 0.959 and an MSE value of *** authors have concluded that the developed model is suitable for designing and predicting ENi-P-TiO_(2) composite coatings to avoid extensive experimentation with economic *** Electron Microscope(SEM)and X-ray diffraction analysis(XrD)are also utilised to compare the base metal and optimal coated surface.

关键词： AH36 steel ENi-P-nanoTiO2 composite coatings Artificial neural networks Taguchi DOE Microhardness Mean squared error

An Experimental Study on the Mixing of Inclined Heated Jets with a Cold Crossflow

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 1993年第4期2卷 237-247页

作者： K.S.Chen Y.r.Cheng National Sun Yat-San University

An experimental study is presented for the mixing of one-and dual-line heated jets injected at 60° angle with x-axis into a cold crossflow in a rectangular *** of the mean temperature,velocity,and turbulence intensity together with the flow visualization were ***-similar forms for the dimensionless vertical temperature profiles were *** variations characterizing the mixing processes of the temperature and velocity fields were examined and correlated in terms of the momentum flux ratio and downstream *** show that both the thermal and velocity penetration depths increase with increasing momentum flux ratio and downstream *** turbulence intensity is strong within the region of jet half-width,and the maximum value occurs at a point close to the jet velocity trajectory.

关键词：热喷嘴动量通量比交叉气流

An Efficient Accurate Direct Solution of Poisson's Equation for Computation of Meteorological Parameters

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 1989年第4期6卷 501-508页

作者： D.r.Chakraborty P.S.Salvekar Indian Institute of Tropical Meteorology Pune-411005IndiaIndian Institute of Tropical MeteorologyPune-411005India

Poisson's equation is solved numerically by two direct methods, viz. Block Cyclic reduction (BCr) method and Fourier Method. Qualitative and quantitative comparison between the numerical solutions obtained by two methods indicates that BCr method is superior to Fourier method in terms of speed and accuracy. Therefore. BCr method is applied to solve (?)2(?)= ζ and (?)2X= D from observed vorticity and divergent values. Thereafter the rotational and divergent components of the horizontal monsoon wind in the lower troposphere are reconstructed and are com pared with the results obtained by Successive Over-relaxation (SOr) method as this indirect method is generally in more use for obtaining the streamfunction ((?)) and velocity potential (X) fields in NWP models. It is found that the results of BCr method are more reliable than SOr method.

关键词： An Efficient Accurate Direct Solution of Poisson’s Equation for Computation of Meteorological Parameters

Non-invasive image processing method to map the spatiotemporal evolution of solute concentration in two-dimensional porous media

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2018年第4期30卷 758-761页

作者：钱家忠王泽坤 r.M.Garrard Yong Zhang 马雷 School of resources and Environmental Engineering Hefei University of Technology The 3rd Engineering Co. LTD of China Railway 16thBureau Group Department of Geological Sciences University of Alabama State Key Laboratory of Hydrology-Water resources and Hydraulic Engineering Hohai University

A color visualization-based image processing method is developed in this paper to quantify the concentration evolution of the Brilliant Blue FCF transport through a two-dimensional homogeneous porous medium. A series of images are recorded at known time intervals, then the spatial distribution is estimated using a calibration curve, linking the gray pixel value to the solute concentration. Using a multi-dimensional concentration distribution map extraction technique the longitudinal and transverse concentration distributions could be observed with the physical model. The image-processed concentrations are then compared directly with the measured concentrations sampled at the outlet end. The tracer breakthrough curves sampled at multiple points along the central line of the medium are also compared with the solutions from the standard advection–dispersion equation model. It is shown that the non-invasive image processing method may be used to map the spatiotemporal evolution of a solute＇s concentration without disturbing the flow or the transport dynamics, although the measured solute breakthrough curves feature some non-Fickian dynamics that cannot be efficiently captured by the standard transport model.

关键词： Solute transport color tracer porous media image processing method