检索结果-南通市图书馆

Palaeoskapha sichuanensis gen. et sp. nov. (menispermaceae) from the Eocene Relu Formation in western Sichuan, West China

在线全文

学校读者我要写书评

暂无评论

植物分类学报 2007年第4期45卷 576-582页

作者： frederic m. b. jacques GUO Shuang-Xing museum National d＇Histoire Naturelle D~partement Histoire de la Terre CP 38 UMR 5143 - USM 0203 8 rue Buffon 75231 Pads Cedex 05 France Nanjmg Institute of Geology and Palaeontology the Chinese Academy of Sciences Nanjing 210008 China Kunming lnstitute of botany the Chinese Academy of Sciences Ktmming 650204 China

Palaeoskapha sichuanensis gen. et sp. nov. of menispermaceae is described here for the first time based on a well preserved fossil fruit. The specimen was found in the Relu Formation of western Sichuan, West China. The specimen, straight, boat-shaped endocarp with large ventral condyle, clearly belongs to the tribe Tinosporeae. The wide aperture of the double condyle, combined with a whole shape not deeply invaginated, indicates a genus different from what was already known to science for this tribe. This fossil widens the distribution of the tribe during Eocene from North America and Europe to Asia, where it was formerly unknown.

关键词：防已科始新世四川群系新种植物化石果实

A Whole Plant Herbaceous Angiosperm from the middle Jurassic of China

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2016年第1期90卷 19-29页

作者： HAN Gang LIU Zhongjian LIU Xueling mAO Limi frederic m.b. jacques WANG Xin Palaeontological Center Bohai UniversityJinzhou 121013LiaoningChina Shenzhen Key Laboratory for Orchid Conservation and Utilization National Orchid Conservation Center of China and Orchid Conservation&Research Center of ShenzhenShenzhen 518114GuangdongChina State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyCASNanjing 210008China Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenCASMengla 666303YunnanChina

In contrast to woody habit with secondary growth, truthful herbaceous habit lacking secondary growth is restricted to angiosperms among seed plants. Although angiosperms might have occurred as early as in the Triassic and herbaceous habit theoretically may have been well adopted by pioneer angiosperms, pre-Cretaceous herbs are missing hitherto, leaving the origin of herbs and evolution of herbaceous angiosperms mysterious. Here we report Juraherba bodae gen. et sp. nov, a whole plant herbaceous angiosperm, from the middle Jurassic （〉164 ma） at Daohugou Village, Inner mongolia, China, a fossil Lagerst^itten that is worldwide famous for various fossil finds. The angiospermous affinity of Juraherba is ensured by its enclosed ovules/seeds. The plant is small but complete, with physically connected hairy root, stem, leaves, and fructifications. The middle Jurassic age recommends Juraherba as the earliest record of herbaceous seed plants, demanding a refresh look at the evolutionary history of angiosperms.

关键词： seed plant Jurassic herbaceous whole plant angiosperm.

Integrating fossils in a molecular-based phylogeny and testing them as calibration points for divergence time estimates in menispermaceae

在线全文

学校读者我要写书评

暂无评论

Journal of Systematics and Evolution 2011年第1期49卷 25-49页

作者： Frdric m.b. jacques Rosa Del C. ORTIZ Department of biodiversity and biogeography Kunming Institute of Botany Chinese Academy of Sciences State Key Laboratory of Systematic and Evolutionary botany Institute of Botany Chinese Academy of Sciences missouri botanical Garden St. Louis MO 63166-0299 USA

The phylogeny of extant menispermaceae (Ranunculales) is reconstructed based on DNA sequences of two chloroplast genes (rbcL and atpb) from 94 species belonging to 56 genera. Fossilized endocarps represent 34 genera. The positions of these are inferred using 30 morphological characters and the molecular phylogeny as a backbone constraint. Nine of the thirteen nodes that are each dated by a fossil are used as calibration points for the estimates of molecular divergence times. bEAST is used to estimate stem age (121.2 myr) and crown age (105.4 myr) for menispermaceae. This method does not require an input tree topology and can also account for rate heterogeneity among lineages. The sensitivity of these estimates to fossil constraints is then evaluated by a cross-validation procedure. The estimated origin for menispermaceae is dated to the mid-Jurassic if the customary maximum age of 125 myr for eudicots is not implemented. All constraints when used alone failed to estimate node ages in some parts of the tree. Fossils from the Palaeocene and Eocene impose strict constraints. Likewise, the use of Prototinomiscium as a dating constraint for menispermaceae appears to be a conservative approach.

关键词： age calibration cross-validation fossil menispermaceae molecular scaffold phylogeny.

A New Species of Tsuga(Pinaceae) based on Lignified Wood from the Late miocene of Central Yunnan, China, and Its Paleoenvironmental Implications

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2015年第5期89卷 1429-1439页

作者： WANG Haobo Olesia V.bONDARENKO Frédéric m.b.jacques WANG Yuehua ZHOU Zhekun Key Laboratory for Plant Diversity and biogeography of East Asia Kunming Institute of Botany Chinese Academy of Sciences School of Life Science Yunnan University College of Agriculture and bioscience Dali University University of Chinese Academy of Sciences Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical Garden Chinese Academy of Sciences Institute of biology and Soil Science Far Eastern Branch Russian Academy of Sciences

A new species, Tsuga nanfengensis ***.（Pinaceae）, is described on the basis of lignified fossil wood from the late miocene of the Xianfeng basin, central Yunnan, southwestern *** observation of the fossil wood specimens show the following characteristics： distinct growth rings, absence of resin canals, uniseriate bordered pits in the radial wall of tracheids, ray tracheids and piceoid and cupressoid cross-field *** features indicate similarities to the wood of extant Tsuga canadensis, ***, and *** to the fossil record, Tsuga was present in Xundian County during the *** Tsuga is drought intolerant, preferring wet conditions with no extant species growing naturally in Xundian *** presence of Tsuga in the miocene of Xundian County indicates a humid climate consistent with previous palaeoclimatic reconstructions showing a wetter and probably shorter dry season in the miocene, relative to the present ***, the change in the local climate such as increasing aridity through the miocene might explain the local extinction of Tsuga from central Yunnan.

关键词： Tsuga fossil wood palaeoclimate late miocene Yunnan

Study of intracellular anabolism of 5-fluorouracil and incorporation in nucleic acids based on an LC-HRmS method

在线全文

学校读者我要写书评

暂无评论

Journal of Pharmaceutical Analysis 2021年第1期11卷 77-87页

作者： Christelle machon frederic Catez Nicole Dalla Venezia Floriane Vanhalle Laetitia Guyot Anne Vincent maxime Garcia beatrice Roy Jean-jacques Diaz Jerome Guitton Laboratoire de Chimie Analytique Faculte de Pharmacie de LyonUniversite Lyon 18 Avenue RockefellerLyon69373France Laboratoire de biochimie et de Pharmaco-toxicologie Centre Hospitalier Lyon-SudeHCLPierre Benite69495France Inserm U1052 CNRS UMR5286 Centre de Recherche en Cancerologie de LyonF-69000 LyonFrance.Centre Leon BerardF-69008 LyonFranceUniversite de Lyon 1F-69000 LyonFrance Institut des biomolecules max mousseron(Ibmm) UMR 5247 CNRSUniversite de MontpellierENSCMCampus TrioletMontpellierFrance Laboratoire de toxicologie Faculte de pharmacie de Lyon8 avenue RockefellerF-69373 LyonFrance

5-Fluorouracil(5-FU)is an anticancer drug extensively used for different *** metabolic activation leads to several nucleoside and nucleotide metabolites essential to exert its cytotoxic activity on multiple cellular targets such as enzymes,DNA and *** this paper,we describe the development of a method based on liquid chromatography coupled with high resolution mass spectrometry suitable for the simultaneous determination of the ten anabolic metabolites(nucleoside,nucleotide and sugar nucleotide)of *** chromatographic separationwas optimized on a porous graphitic carbon column allowing the analysis of the metabolites of 5-FU as well as endogenous *** detection was performed on an Orbitrap■tandem mass *** of the method was verified in intracellular content and in RNA *** limit of detection was equal to 12 pg injected on column for nucleoside metabolites of 5-FU and 150 pg injected on column for mono-and tri-phosphate nucleotide *** effect was evaluated in cellular contents,DNA and RNA extracts for nucleoside and nucleotides *** method was successfully applied to i)measure the proportion of each anabolic metabolite of 5-FU in cellular contents,ii)follow the consequence of inhibition of enzymes on the endogenous nucleotide pools,iii)study the incorporation of metabolites of 5-FU into RNA and DNA,and iv)to determine the incorporation rate of 5-FUrd into 18 S and 28 S sub-units of rRNA.

关键词： 5-Fluorouracil LC-mS-HRmS Nucleotide RNA DNA Incorporation rate

measures of Relative and Absolute Convergence and Pro-poor Growth with an Illustration based on China(2010–2018)

在线全文

学校读者我要写书评

暂无评论

China & World Economy 2024年第2期32卷 1-41页

作者： Elena bárcena-martin jacques Silber Yuan Zhang Facultad de Ciencias Económicas y Empresariales Universidad de MálagaSpain Department of Economics Bar-Ilan UniversityIsrael China Center for Economic Studies Fudan UniversityChina

Income m.bility is a key issue for understanding the process of economic growth and distributional *** economists have used the concept of“pro-poor growth”to examine,with individual-level panel data,whether the poor benefit more than the rich from economic growth by tracking the extent of income m.bility among different population *** is also literature in macroeconomics on the measurement of *** paper introduces population-weighted relative and absolute indices of m.bility,convergence,and pro-poor growth;it also distinguishes between anonymous and nonanonymous approaches to these *** empirical analysis is based on Chinese panel data for the period 2010–*** both absolute and relative terms,income growth in China was greater for individuals with an initially lower income but only for lower income deciles in relative *** was also an overall increase in individual welfare from anonymous and nonanonymous perspectives,which was higher among younger *** welfare of the poor did not increase more than that of the *** results shed light on the evolution of income distribution in China during the past decade's rapid economic growth.

关键词： anonymous and nonanonymous approach convergence exchange and structural m.bility pro-poor growth

SPECTRAL ImAGING AND ANALYSIS TO YIELD TISSUE OPTICAL PROPERTIES

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 Innovative Optical Health Sciences 2009年第2期2卷 123-129页

作者： STEVEN L.jacques Departments of Dermatology and biomedical Engineering Oregon Health&Science University PortlandOregonUSA

An introduction to the basics of spectral imaging as applied to biological tissues is *** example of a spectral image of a face is used to demonstrate the data and spectral analysis that specify the melanin content(m),blood content(b),tissue oxygen saturation(S),water content(W),fraction of scattering due to Rayleigh scattering(f)and due to mie scattering(1−f),and the reduced scattering coefficient at 500-nm wavelength(µs 500 nm).The sensitivity of reflectance spectra to variation in the various parameters is illustrated.

关键词： Spectroscopy spectral imaging tissue optical properties optical diagnostics.

Effect of vegetated-banks on local scour around a wing-wall abutment with circular edges

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 Hydrodynamics 2014年第3期26卷 447-457页

作者： AFZALImEHR Hossein bAKHSHI Somayeh GALLICHAND jacques SUI Jueyi Department of Water Engineering Isfahan University of Technology Isfahan Iran Department Des Sols Et De Génie Agroalimentaire Pavillon Paul-Comtois Université Laval St-Foy QC Canada Environmental Engineering program University of Northern British Colombia Prince George BC Canada

Failure of bridges due to local scour in the vicinity of bridge abutments is a common occurrence. In this study, experiments under two different channel conditions were conducted to assess the impacts of vegetation on channel banks on local scour around a wing-wall abutment with circular edges. Some experiments were conducted in channel with vegetation on channel banks, and other experiments in channel without vegetation on channel bank. The flow velocity and Reynolds stress distributions in scour holes around a wing-wall abutment with circular edges were compared under these 2 different channel conditions. Results reveal that the vegetated-banks can reduce the time for achieving the equilibrium condition from 17 h to 9 h. Also, vegetated-bank channels can result in a significant decrease in the maximum scour depth from 0.084 m（for bare channel bank） to 0.00032 m. Additionally, around the abutment, vegetated-banks play a significant role in diminishing the Reynolds stress（RS） near the bed and removing negative values in RS distribution by weakening unfavorable pressure gradient and down-flow in the upstream of abutment.

关键词： local scour vegetated-banks wing-wall abutment circular edges Reynolds stress(RS)

Numerical investigation of velocity ratio effect in combined wall and offset jet flows

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2018年第6期30卷 1105-1119页

作者： Nidhal Hnaien Salwa marzouk Habib ben Aissia jacques Jay Unité de métrologie et des systèmes énergétiques Ecole National d'ingénieurs de Monastir Tunisie Centre de Thermique de Lyon (CETHIL-UmR CNRS 5008) INSA de Lyon France

In the present work, we propose to numerically study a combined turbulent wall and offset jet flow(this combination will be denoted WOJ). Several turbulence models were tested in this study: the standard k-w, SST k-w, standard k-ε, RNG, and realizable k-ε model. A parametric study was performed to determine the effect of offset ratio H and the velocity ratio r on the longitudinal and transverse positions of the merge point(mP), the combined point(CP), the upper vortex center(UVC) and the lower vortex center(LVC). Correlations that predict the position of these characteristic points of the WOJ flow as a function of H and r have been provided. Results show that any increase in the velocity ratio causes a displacement of the mP, CP, UVC and LVC further upstream along the longitudinal direction. Concerning the transverse positions, the increase of velocity ratio results in a deviation of the merge point(mP) and the lower vortex center(LVC) toward the strong jet(LWJ) whereas the transverse position of combined point(CP) and the upper vortex center(UVC) is almost independent of the velocity ratio.

关键词： Finite volume combined point merge point offset jet velocity ratio