检索结果-南通市图书馆

Historical Dataset Reconstruction and a Prediction Method of Solar 10.7cm Radio flux

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Astronomy and Astrophysics 2008年第4期8卷 472-476页

作者： juan Zhao Yan-Ben Han Department of Astronomy Beijing Normal University Beijing 100875 China National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China

We reconstruct the developing history of solar 10.7 cm radio flux （f10.7） since 1848, based on the yearly sunspot number and the variations. A relationship between the maximum and the linear regression slope of the first 3 years starting from minimum of the solar cycle is considered. We put forward a method of predicting the maximum of f10.7 by means of the slope-maximum relationship. Running tests for cycles 19 to 23 indicate that the method can properly predict the peak of f10.7.

关键词： Sun activity -- Sun radio radiation - Sun sunspots

Analyzing the genomic and transcriptomic architecture of milk traits in Murciano-Granadina goats

在线全文

学校读者我要写书评

暂无评论

Journal of Animal Science and Biotechnology 2020年第3期11卷 649-666页

作者： Dailu Guan Vincenzo Landi María Gracia Luigi-Sierra juan Vicente delgado Xavier Such Anna Castelló Betlem Cabrera Emilio Mármol-Sánchez Javier fernández-Alvarez JoséLuis Ruiz de la Torre Casañas Amparo Martínez Jordi Jordana Marcel Amills Centre for Research in Agricultural Genomics(CRAG) CSIC-IRTA-UAB-UBUniversitat Autònoma de Barcelona08193 BellaterraSpain Departamento de Genética Universidad de Córdoba14071 CórdobaSpain Departament de Ciència Animal i dels Aliments Facultat de VeterinàriaUniversitat Autònoma de Barcelona08193 BellaterraSpain Asociación Nacional de Criadores de Caprino de Raza Murciano-Granadina(CAPRIGRAN) 18340 GranadaSpain Servei de Granges i Camps Experimentals Universitat Autònoma de Barcelona08193 BellaterraSpain

Background:In this study,we aimed to investigate the molecular basis of lactation as well as to identify the genetic factors that influence milk yield and composition in *** achieve these two goals,we have analyzed how the mRNA profile of the mammary gland changes in seven Murciano-Granadina goats at each of three different time points,i.e.78 d(T1,early lactation),216 d(T2,late lactation)and 285 d(T3,dry period)after ***,we have performed a genome-wide association study(GWAS)for seven dairy traits recorded in the 1st lactation of 822 Murciano-Granadina ***:The expression profiles of the mammary gland in the early(T1)and late(T2)lactation were quite similar(42 differentially expressed genes),while strong transcriptomic differences(more than one thousand differentially expressed genes)were observed between the lactating(T1/T2)and non-lactating(T3)mammary glands.A large number of differentially expressed genes were involved in pathways related with the biosynthesis of amino acids,cholesterol,triglycerides and steroids as well as with glycerophospholipid metabolism,adipocytokine signaling,lipid binding,regulation of ion transmembrane transport,calcium ion binding,metalloendopeptidase activity and complement and coagulation *** regard to the second goal of the study,the performance of the GWAS allowed us to detect 24 quantitative trait loci(QTLs),including three genome-wide significant associations:QTL1(chromosome 2,130.72-131.01 Mb)for lactose percentage,QTL6(chromosome 6,78.90-93.48 Mb)for protein percentage and QTL17(chromosome 17,11.20 Mb)for both protein and dry matter ***,QTL6 shows positional coincidence with the casein genes,which encode 80%of milk ***:The abrogation of lactation involves dramatic changes in the expression of genes participating in a broad array of physiological processes such as protein,lipid and carbohydrate metabolism,calcium homeostasis,cell death and tissue remo

关键词： Casein genes Dairy traits GWAS Lactation QTLs RNA-Seq

Three New Cucurbitacins from Hemsleya lijiangensis

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2003年第4期14卷 389-392页

作者： Ming Hua CHIU juan GAO State Key Laboratory of Phytochemistry and Plant Resource in West China Kunming Institute of BotanyChinese Academy of SciencesKunming 650204

Three new cucurbitacins were isolated from the BuOH extract of the rhizomes of Hemsleya lijiangensis. Their structures were elucidated as 23, 24 -dihydro cucurbitacin f-16, 25-diacetate(1), 23, 24-dihydro cucurbitacin f-16, 25-diacetate-2-O-β-D glucopyranoside (2), 23, 24-dihydro-cucurbitacin f-16-acetate(3), respectively; by spectral analyses.

关键词： Hemsleya lijiangensis Cucurbitaceae Hemslecins D, E, f.

Validity of Parametrized Quark Propagator

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2005年第1X期44卷 117-122页

作者： ZHUJi-Zhen ZHOULi-juan MAWei-Xing DepartmentofInformationandComputingScience GuangxiUniversityofTechnologyLiuzhou545006China DepartmentofInformationandComputingScience GuangxiUniversityofTechnologyLiuzhou545006China//CollegeofPhysicalScienceandEngineeringTechnologyGuangxiUniversityNanning530004China DepartmentofInformationandComputingScience GuangxiUniversityofTechnologyLiuzhou545006China//InstituteofHighEnergyPhysicstheChineseAcademyofSciencesP.O.Box918Beijing100039China

Based on an extensively study of the Dyson-Schwinger equations for a fully dressed quark propagator in the "rainbow" approximation, a parametrized fully dressed quark propagator is proposed in this paper. The parametrized propagator describes a confining quark propagator in hadron since it is analytic everywhere in complex p2-plane and has no Lemmann representation. The validity of the new propagator is discussed by comparing its predictions on selfenergy functions Af(p2), Bf(p2) and effective mass Mf(p2) of quark with flavor f to their corresponding theoretical results produced by Dyson-Schwinger equations. Our comparison shows that the parametrized quark propagator is a good approximation to the fully dressed quark propagator given by the solutions of Dyson-Schwinger equations in the rainbow approximation and is convenient to use in any theoretical calculations.

关键词：夸克传播 Dyson-Schwinger方程非干涉QCD 参数表示高能物理

The TafIM1 gene mediates wheat resistance against Puccinia striiformis f. sp. tritici and responds to abiotic stress

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2021年第7期20卷 1849-1857页

作者： SHI Bei-bei WANG juan GAO Hai-feng ZHANG Xiao-juan WANG Yang MA Qing State Key Laboratory of Crop Stress Biology for Arid Areas Northwest A&F UniversityYangling 712100P.R.China School of Life Science Shanxi Datong UniversityDatong 037009P.R.China Institute of Plant Protection Xinjiang Academy of Agricultural Sciences/Key Laboratory of Integrated Pest Management on Crop in Northwestern OasisMinistry of Agriculture and Rural AffairsUrumqi 830091P.R.China

fimbrin, a regulator of actin cytoskeletal dynamics that participates in numerous physiological and biochemical processes, controls multiple developmental processes in a variety of tissues and cell types. However, the role of fimbrin in pathogen defense of wheat and the mechanisms have not been well studied. Here, we investigated that the expression of TafIM1 gene of wheat was significantly induced in response to avirulent race of Puccinia striiformis f. sp. tritici(Pst) and silencing of TafIM1 by virus-induced gene silencing method. The results show that silencing of TafIM1 resulted in a reduction of resistance against the stripe rust indicated by both phenotypes and a histological examination of Pst growth. Additionally, the expression level of Ta fIM1 gene was up-regulated under abiotic stresses. These findings suggest that Ta fIM1 functions as a positive regulator of pathogen resistance of wheat plants and response to abiotic stress. Our work may show new light on understanding the roles of fimbrin in wheat.

关键词： wheat Puccinia striiformis f.sp.tritici fimbrin disease resistance abiotic stress

Seasonal variations of leaf traits and drought adaptation strategies of four common woody species in South Texas, USA

在线全文

学校读者我要写书评

暂无评论

Journal of forestry Research 2019年第5期30卷 1715-1725页

作者： juan Qin Zhouping Shangguan Weimin Xi School of Resources and Environment Anhui Agricultural UniversityHefei 230036AnhuiChina Department of Biological and Health Sciences Texas A&M University-KingsvilleKingsvilleTX 78363USA State Key Laboratory of Soil Erosion and Dryland farming on the Loess Plateau Northwest A&F UniversityYangling 712100ShaanxiChina

Understanding physiological responses and drought adaptation strategies of woody plant leaf traits in sub-humid to semi-arid regions is of vital importance to understand the interplay between ecological processes and plant resource-allocation strategies of different tree *** variations of leaf morphological traits,stoichiometric traits and their relationships of two drought tolerant woody species,live oak(Quercus virginiana)and honey mesquite(Prosopis glandulosa)and two less drought tolerant species,sugarberry(Celtis laevigata)and white ash(fraxinus americana)were analyzed in a sub-humid to semi-arid area of south Texas,*** findings demonstrate that for the two drought tolerant species,the leguminous *** had the highest specific leaf area,leaf N,P,and lowest leaf area and dry mass,indicating that *** adapts to an arid habitat by decreasing leaf area,thus reducing water loss,reflecting a resource acquisition *** the evergreen species *** exhibited higher leaf dry mass,leaf dry matter content,C content,C:N,C:P and N:P ratios,adapts to an arid habitat through increased leaf thickness and thus reduced water loss,reflecting a resource conservation strategy in south *** the two less drought tolerant deciduous species,the variations of leaf traits in *** and *** varied between *** and ***,reflecting a trade-off between rapid plant growth and nutrient maintenance in a semi-arid environment.

关键词： Drought adaptation strategies Leaf traits Seasonal variations South Texas Woody species

Proteomic analysis of f_(1)hybrids and intermediate variants in a Littorina saxatilis hybrid zone

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2022年第3期68卷 351-359页

作者： Angel P.DIZ Mónica R.ROMERO juan GALINDO María SAURA David O.f.SKIBINSKI Emilio ROLÁN-ALVAREZ Centro de Investigación Mariña(CIM-UVIGO) Universidade de VigoVigo 36310Spain Departamento de Mejora Genética Animal INIAMadrid 28040Spain Institute of Life Science Swansea University Medical SchoolSwansea SA28PPUK

Proteomic analysis was carried out on the Crab(upper-shore)and Wave(lower-shore)ecotypes of Littorina saxatilis from a hybrid zone at Silleiro Cape,*** profiles of individual snails were *** expression in f_(1)hybrid snails bred in the laboratory and snails with intermediate shell phenotypes collected from the mid-shore were compared with Crab and Wave ecotypes using analytical approaches used to study *** analysis over many protein spots showed that the f_(1)snails are distinct from both ecotypes but closer to the Wave *** intermediate snails are highly variable,some closer to the Crab and others to the Wave *** on a protein by protein basis,some proteins are significantly closer in expression to the Crab and others to the Wave ecotype for both f_(1)and intermediate ***,a significant majority of proteins were closer in expression to the Wave ecotype for the f_(1),consistent with the multivariate *** such significant majority toward either the Crab or Wave ecotype was observed for the intermediate *** closer similarity of f_(1)and Wave ecotype expression patterns could be the result of similar selective pressures in the similar mid-shore and low-shore *** a significantly larger number of proteins,intermediate snails were closer in expression to the ecotype having the lower expression,for both Crab and Wave *** is somewhat unexpected as lower expression might be expected to be an indication of impairment of function and lower *** analysis could be important for the identification of candidate proteins useful for gaining improved understanding of adaptation and barriers to gene flow in hybrid zones.

关键词： f_(1)hybrids gene expression marine invertebrates molecular phenotype reproductive isolation speciation

Bioelectronic protein nanowire sensors for ammonia detection

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

Nano Research 2020年第5期13卷 1479-1484页

作者： Alexander f.Smith Xiaomeng Liu Trevor L.Woodard Tianda fu Todd Emrick juan M.Jiménez Derek R.Lovley Jun Yao Department of Biomedical Engineering University of MassachusettsAmherstMA 01003USA Department of Electrical and Computer Engineering University of MassachusettsAmherstMA 01003USA Department of Microbiology University of MassachusettsAmherstMA 01003USA Department of Polymer Science and Engineering University of MassachusettsAmherstMA 01003USA Department of Mechanical and Industrial Engineering University of MassachusettsAmherstMA 01003USA Institute for Applied Life Sciences(IALS) University of MassachusettsAmherstMA 01003USA

Electronic sensors based on biomaterials can lead to novel green technologies that are low cost,renewable,and *** we demonstrate bioelectronic ammonia sensors made from protein nanowires harvested from the microorganism Geobacter *** nanowire sensor responds to a broad range of ammonia concentrations(10 to 10^6 ppb),which covers the range relevant for industrial,environmental,and biomedical *** sensor also demonstrates high selectivity to ammonia compared to moisture and other common gases found in human *** results provide a proof-of-concept demonstration for developing protein nanowire based gas sensors for applications in industry,agriculture,environmental monitoring,and healthcare.

关键词： nanowire protein nanowire biomaterial bioelectronics biosensor ammonia sensor

Exact solutions for different vorticity functions of couple stress fluids

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 Zhejiang University-Science A(Applied Physics & Engineering) 2008年第5期9卷 672-680页

作者： Saeed ISLAM Chao-ying ZHOU Xiao-juan RAN Department of Mechanical Engineering and Automation Harbin Institute of Technology Shenzhen Graduate School Shenzhen 518055 China COMSATS Institute of lnformation Technology Islamabad 44000 Pakistan

In this paper, inverse solutions are obtained for the class of 2D steady incompressible couple stress fluid flows. This class consists of flows for which the vorticity distribution is given by ▽2ψ=ψ+f(x,y). The solutions are obtained by applying the inverse method, which makes certain hypotheses regarding the form of the velocity field and pressure but without making any regarding the boundaries of the domain occupied by the fluid. Inverse solutions are derived for three different forms of f(x,y).

关键词： Exact solutions Vorticity functions Beltrami flow Couple stress fluid