检索结果-南通市图书馆

Control of Plant Growth and Defense by Photoreceptors:From Mechanisms to Opportunities in Agriculture

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2021年第1期14卷 61-76页

作者： ronald Pierik Carlos L.Ballare Plant Ecophysiology Department of BiologyUtrecht UniversityPadualaan 8Utrecht 3584 CHthe Netherlands IFEVA Consejo Nacional de Investigaciones Cientificas y TecnicasUniversidad de Buenos AiresAve.San Martin 4453C1417DSEBuenos AiresArgentina IIBIO-INTECH Consejo Nacional de Investigaciones Cientificas y TecnicasUniversidad Nacional de San MartinB1650HMPBuenos AiresArgentina

Plants detect and respond to the proximity of competitors using light signals perceived by photoreceptor proteins.A low ratio of red to far-red radiation(r:Fr ratio)is a key signal of competition that is sensed by the photoreceptor phytochrome B(phyB).Low r:Fr ratios increase the synthesis of growth-related hormones,including auxin and gibberellins,promoting stem elongation and other shade-avoidance *** photoreceptors that help plants to optimize their developmental configuration and resource allocation patterns in the canopy include blue light photoreceptors,such as cryptochromes and phototropins,and UV receptors,such as *** photoreceptors act by directly or indirectly controlling the activity of two major regulatory nodes for growth and development:the COP1/SPA ubiquitin E3 ligase complex and the PIF transcription *** is also an important modulator of hormonal pathways that regulate plant defense against herbivores and pathogens,including the jasmonic acid signaling pathway,In this Perspective,we discuss recent advances on the studies of the mechanisms that link photoreceptors with growth and *** these mechanisms is important to provide a functional platform for breeding programs aimed at improving plant productivity,stress tolerance,and crop health in species of agronomic interest,and to manipulate the light environments in protected agriculture.

关键词： photoreceptor phytochrome jasmonate growth-defense trade-off shade avoidance immunity

iBioChina and iBiology: spreading scientific knowledge together

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

Science China(Life Sciences) 2015年第11期58卷 1180-1182页

作者： DELL Karen r VALE ronald D i Biology University of California Howard Hughes Medical Institute Department of Cellular and Molecular PharmacologyUniversity of California

It is becoming increasingly important for the public to un- derstand how new scientific information and technology impact their lives and how scientists obtain new knowledge. Without this understanding, how do people know if global warming is real or if it is safe to eat genetically modified crops？ Dr. Chen ZhangLiang, the Vice President of China Association of Science and Technology （CAST）, conveyed this message in his talk at the Chinese Society for Cell Bi- ology （CSCB） Biennial Conference held in Shenzhen in April, 2015.

关键词：科学知识科学技术协会传播科学信息转基因作物全球变暖联合国科学家

同方期刊数据库

IMPACTS OF DIMENSION AND SLOPE OF SUBMErGED SPUr DIKES ON LOCAL SCOUr PrOCESSES-AN EXPErIMENTAL STUDY

在线全文

学校读者我要写书评

暂无评论

International Journal of Sediment research 2006年第2期21卷 89-100页

作者： ronald W.THrING Environmental Science and Engineering University of Northern British Columbia Prince George BC Canada V2N 4Z9 Prof.

In this experimental study, the impacts of the slope of the upstream face of submerged spur dikes on scour patterns in the vicinity of the submerged spur dike have been investigated. Associated hydraulic parameters for scour initiation have been studied. The dependence of the criteria for scour initiation and scour patterns on the dike dimensions such as the dike length and height has been assessed. It is found that the maximum depth of a scour hole is localized upstream of the spur dike end. The location of the maximum scouring depth, the end of the spur dike, and the spot with the maximum deposition are nearly aligned and form a line approximately parallel to the flume wall. results show that the proper selection of a sloped upstream face of the spur dike can significantly reduce the maximum scour depth and scour volume in the vicinity of the submerged spur dike. Equations have been established to describe the dependence of the criteria for scour initiation and the maximum depth of the scour hole on the Froude number of the flow, the blockage of the cross section by the spur dikes, the slope of upstream face of the spur dike, and the grain size of the bed material.

关键词： Spur dike dimensions Froude number Local scour Scour depth Slope of upstream face (SUF) of spur dike Submerged spur dike

The effect of three-dimensional glottal geometry on intraglottal quasi-steady flow distributions and their relationship with phonation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2006年第1期49卷 82-88页

作者： SCHErEr ronald C. Department of Communication Disorders Bowling Green State University 200 Health Center Bowling Green Ohio 43402 USA

Vocal fold geometry plays an important role in human phonation. The intraglottal quasi-steady pressure; velocity distributions depend upon the shape, size,; diameter of the glottis. This study reports the effects of the variation of glottal shapes on intraglottal pressures; velocities using a Plexiglas model with a glottis having nine symmetric glottal angles (uniform, as well as convergent; divergent 5°, 10°, 20°; 40°), while the minimal glottal diameter was held constant at 0.06 cm. The empirical data were supported by penalty finite element computational results. The results suggest that larger convergent glottal angles correspond to increased pressures; decreased velocities in the glottis upstream of the minimum glottal location, with a reversal of this pattern at the minimal glottal diameter location. The pressure dip near the glottal entrance for divergent glottal angles was greatest for the 10° divergence angle condition,; was sequentially less for 5°, 20°,; 40°. Flow resistance was greater for a convergent angle than a divergent angle of the same value,; least for the 10° divergent condition. Pressure recovery in the glottis suggested that the optimal glottal diffuser angle was near 10°. results suggest that the glottal geometry has a critical relationship with phonation (especially for vocal efficiency),; therefore important significance to understanding artistic voice; clinical voice management.

关键词： vocal fold geometry, laryngeal aerodynamics modeling, phonation, quasi-steady flow.

Analysis and Modeling of Calendar Aging and Cycle Aging of LiCoO_(2)/Graphite Cells

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2024年第3期33卷 1109-1118页

作者： WANG Wei YUAN Baoqiang SUN Qie WENNErSTEN ronald Institute of Thermal Science and Technology Shandong UniversityJi’nan250061China School of Energy and Power Engineering Shandong UniversityJi’nan250061China Institute for Advanced Science and Technology Shandong UniversityJi’nan250061China

Lithium-ion batteries are used in a wide range of ***,their cycle life suffers from the problem of capacity fade,which includes calendar and cycle *** effects of storage time,temperature and partial charge-discharge cycling on the capacity fade of Li-ion batteries are investigated in this *** calendar aging and cycle aging are presented based on the storage and cycling experiment on LiCoO_(2)/graphite cells under different storage temperature and different ranges of state of charge(SOC).Based on the measurement data,a one-component and a double-component aging model are presented to respectively describe the capacity fade caused by calendar and cycle *** calendar aging of LiCoO_(2)/graphite batteries is mainly affected by temperature and SOC during the *** SOC and change in SOC(ΔSOC)are the main factors affecting battery degradation during cycling operation.

关键词： Lithium-ion battery LiCoO_(2)(LCO)/graphite calendar aging cycle aging lifetime model

Modelling the population fluctuation of winter moth and mottled umber moth in central and northern Germany

在线全文

学校读者我要写书评

暂无评论

Forest Ecosystems 2019年第1期6卷 38-55页

作者： Anika Hittenbeck ronald Bialozyt Matthias Schmidt Northwest German Forest research Institute

Background: Winter moth(Operophtera brumata) and mottled umber moth(Erannis defoliaria) are forest Lepidoptera species characterized by periodic high abundance in a 7–11 year cycle. During outbreak years they cause severe defoliation in many forest stands in Europe. In order to better understand the spatio-temporal dynamics and elucidate possible influences of weather, stand and site conditions, a generalized additive mixed model was developed. The investigated data base was derived from glue band catch monitoring stands of both species in Central and North Germany. From the glue bands only female moth individuals are counted and a hazard code is calculated. The model can be employed to predict the exceedance of a warning threshold of this hazard code which indicates a potential severe defoliation of oak stands by winter moth and mottled umber in the coming ***: The developed model accounts for specific temporal structured effects for three large ecoregions and random effects at stand level. During variable selection the negative model effect of pest control and the positive model effects of mean daily minimum temperature in adult stage and precipitation in early pupal stage were ***: The developed model can be used for short-term predictions of potential defoliation risk in Central and North Germany. These predictions are sensitive to weather conditions and the population dynamics. However, a future extension of the data base comprising further outbreak years would allow for deeper investigation of the temporal and regional patterns of the cyclic dynamics and their causal influences on abundance of winter moth and mottled umber.

关键词： Operophtera brumata Erannis defoliaria Generalized additive mixed model Weather effect Insect pest outbreaks

A Study in the 20th-Century Western Assimilation of China： The American Poet Ezra Pound＇s Imagination of Kwan-yin in the Pisan Cantos

在线全文

学校读者我要写书评

暂无评论

浙江大学学报（人文社会科学版） 2012年第3期42卷 53-73页

作者： ronald Bush St John＇s College Oxford University St. Giles Oxford OX1 3J P UK

Optically stimulated luminescence dating of aeolian sand in the Otindag dune field and Holocene climate change

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

Science China Earth Sciences 2008年第6期51卷 837-847页

作者： Joseph MASON James SWINEHArT ronald GOBLE Department of Geography University of Wisconsin Madison School of Natural resources IANR University of Nebraska-Lincoln Department of Geosciences University of Nebraska-Lincoln

The dune system in Otindag sand field of northern China is sensitive to climate change, where effective moisture and related vegetation cover play a controlling role for dune activity and stability. Therefore, aeolian deposits may be an archive of past environmental changes, possibly at the millennial scale, but previous studies on this topic have rarely been reported. In this study, thirty-five optically stimulated luminescence (OSL) ages of ten representative sand-paleosol profiles in Otindag sand field are ob-tained, and these ages provide a relatively complete and well-dated chronology for wet and dry varia-tions in Holocene. The results indicate that widespread dune mobilization occurred from 9.9 to 8.2 ka, suggesting a dry early Holocene climate. The dunes were mainly stabilized between 8.0 and 2.7 ka, implying a relatively wet climate, although there were short-term penetrations of dune activity during this wet period. After ~2.3 ka, the region became dry again, as inferred from widespread dune activity. The '8.2 ka' cold event and the Little Ice Age climatic deterioration are detected on the basis of the dune records and OSL ages. During the Medieval Warm Period and the Sui-Tang Warm Period (570-770 AD), climate in Otindag sand field was relatively humid and the vegetation was denser, and the sand dunes were stabilized again. These aeolian records may indicate climate changes at millennial time scale during Holocene, and these climatic changes may be the teleconnection to the climate changes elsewhere in the world.

关键词： Otindag sand field OSL dating Holocene drought dune

Evolution of the MLO gene families in octoploid strawberry(Fragaria×ananassa)and progenitor diploid species identified potential genes for strawberry powdery mildew resistance

在线全文

学校读者我要写书评

暂无评论

Horticulture research 2021年第1期8卷 1969-1985页

作者： ronald r.Tapia Christopher r.Barbey Saket Chandra Kevin M.Folta Vance M.Whitaker Seonghee Lee Department of Horticultural Sciences University of FloridaIFAS Gulf Coast Research and Education CenterWimaumaFL 33598USA Department of Horticultural Sciences University of Florida1301 Fifield HallPO Box 110690GainesvilleFL 32611USA

Powdery mildew(PM)caused by Podosphaera aphanis is a major fungal disease of cultivated *** resistance Locus O(MLO)is a gene family described for having conserved seven-transmembrane *** loss-of-function in specific MLO genes can confer durable and broad resistance against PM ***,the genomic structure and potential role of MLO genes for PM resistance have not been characterized yet in the octoploid cultivated *** the present study,MLO gene families were characterized in four diploid progenitor species(Fragaria vesca,***,***,and ***)and octoploid cultivated(Fragaria×ananassa)strawberry,and potential sources of MLO-mediated susceptibility were *** MLO sequences were identified in *** and 68 identified in F.×*** analysis divided diploid and octoploid strawberry MLO genes into eight different clades,in which three FveMLO(MLO10,MLO17,and MLO20)and their twelve orthologs of FaMLO were grouped together with functionally characterized MLO genes conferring PM *** number variations revealed differences in MLO composition among homoeologous chromosomes,supporting the distinct origin of each subgenome during the evolution of octoploid *** genomic sequence and structural variations in candidate FaMLO genes revealed their potential role associated with genetic controls and functionality in strawberry against PM ***,the gene expression profiling and rNAi silencing of putative FaMLO genes in response to the pathogen indicate the function in PM *** results are a critical first step in understanding the function of strawberry MLO genes and will facilitate further genetic studies of PM resistance in cultivated strawberry.

关键词： straw MLO Fragaria