Characterization of DYRK2 (dual-specificity tyrosine-phosphorylation-regulated kinase 2) from Zebrafish (Dario rerio)

Proteins of the DYRK(dual-specificity tyrosine-phosphorylation-regulated kinase) family are characterized by the presence of a conserved kinase domain and N-terminal DH box.DYRK2 is involved in regulating key developmental and cellular processes,such as neurogenesis,cell proliferation,cytokinesis,and cellular differentiation.Herein,we report that the ortholog of DYRK2 found in zebrafish shares about 70% identity with that of human,mouse,and chick.RT-PCR showed that DYRK2 is expressed maternally and zygotica...     

Early diagenetic deformation structures of the Furongian ribbon rocks in Shandong Province of China——A new perspective of the genesis of limestone conglomerates

Ribbon rocks are characterized by an alternation of millimeter-to centimeter-thick limestone and argillaceous deposits (marlstone or shale).The sedimentary processes and diagenetic characteristics of ribbon rocks might be critical to the formation of limestone conglomerates.According to detailed field measurement and laboratory analyses (thin section observation and XRD analysis),four types of ribbon rocks are classified,i.e.,limestone and marlstone couplet (L-M),limestone and shale couplet (L-S),thin-bedde...     

石鲽与牙鲆人工杂交的研究

研究了石鲽（♂）与牙Ping(♀）的人工杂交,杂交后代经7个多月的养殖,许多生物学特征较牙Ping、石鲽发生了较大变异。在全长相同的情况下,杂交鱼的体高比牙Ping体高增加了6％、比石鲽体高增加了4．2％,其体质量以及成活率也都分别比牙Ping、石鲽的高。其杂种优势明显。     

A Whitecap Coverage Model Based on the Surface Slope For Criterion of Wave Breaking

Using the limit surface slope as a criterion of wave breaking,a simple model for estimatingthe spatial fraction of breaking surface of sea at an instant,which is regarded as the whitecap coverge inthis paper,is analytically derived from the probability density of surface slope based on Gaussianstatistics.The resulting fraction is found depending on the fourth moment of wave spectum,m_4,as well asthe critical threshold of surface slope.By expressing the fourth moment in terms of the Neumannspectrum,a formula linking the fraction and wind speed for fully developed sea states is obtianed.Anotherformula relating the fraction to both wind speed and fetch(or duration)is achieved by expressing m_4 interms of the Krylov spectrum and applying the empirical relationships used in the SMB ocean wave pre-dicting technique.A comparison between these results and the field data of whitecap coverage collected byMonahan and O＇Muircheartuigh shows an encouraging agreement.     

试论我国海岸侵蚀信息系统的建立

本文通过对我国海岸侵蚀特点的分析,阐述了建立海岸侵蚀信息系统的必要性和基本方法,并给出了相应的结论。     

山东莒南后左山恐龙公园早白垩世恐龙足迹化石初步研究

山东省莒南县后左山恐龙公园内保存了数量众多、形态各异的恐龙足迹化石。该足迹化石群产于早白垩世大盛群田家楼组,主要是兽脚类、鸟脚类恐龙的足迹,尤以前者占优质。最大的一个为椭圆形,大小100cm×70cm,可能系鸟脚类恐龙的足迹。鸟脚类足迹大多为椭圆形,长轴一般30～40cm,常呈幻迹保存。最大的兽脚类足迹为三趾型,长49cm,宽35cm,是大型肉食龙类的足迹;最小的一个长8.5cm,宽4.5cm,可能是虚骨龙类的足迹。另外还发现了少量可能是驰龙的足迹,具有2个很长的趾(Ⅲ和Ⅳ趾),趾间角极小,二者几乎平行。鸟脚类恐龙足迹层位分布局限,但密度较大,产出的层面常发育泥裂、波痕,甚至冰晶痕,与泥岩、粉砂质泥岩等层位相关性较强。     

Statistical Distribution of Depth-Integrated Local Horizontal Momentum for Second-Order Random Ocean Waves in Finite Water Depth

Based on the second-order random wave solutions of water wave equations in tinite water depth, statistical distributions of the depth-integrated local horizontal momentum components are derived by use of the characteristic function expansion method. The parameters involved in the distributions can be all detemained by the water depth and the wavenumber spectrum of ocean waves. As an illustrative example, a fully developed wind-generated sea is considered and the parameters are calculated for typical wind speeds and water depths by means of the Donelan and Pierson spectrum. The effects of nonlinearity and water depth on the distributions are also investigated.     

The Sedimentary Sequence and Palaeogeographic Changes of the South Yellow Sea Since the Olduvai Subchron

According to the alternation of terrestrial beds and transgressive beds, the sedimentary sequence of the South Yellow Sea since the Olduvai subchron can be divided into 15 stratigraphical intervals. According to the facies analysis, there are 7 transgressive beds and one bed with transgression marks, and classical transgressive-regressive facies sequence also appears in the major transgressive beds.Palaeogeographic evolution in the shelf area involved 4 periods: (1) 1.70-0.5 Ma B. P. was the stage for the development of the Palaeo-Yangtze River alluvial plain and delta. Tide influenced -river channel sediments formed during the Olduvai have been found in borehole QC2. The river mouth was located near 124°E and during the transgressive stage from 0.97-0.73 Ma B.P. to the east of 122.2°E, a large-scale undersea delta was formed. In the regressive stage, the shelf area became an alluvial plain. (2) 0.50-0.75 Ma B.P. was a multi-transgressive fluctuation stage during which 3 transgressive beds (HVI, HV, H     

Deblurring Texture Extraction from Digital Aerial Image by Reforming “Steep Edge” Curve

IntroductionTexture extract from digital aerial image iswidely used for three dimensional city modelingto generate“photo realistic” views. Image de blurring is one of main problems in image pro cessing, and two classical methods, image en hancement and image restoration, are usually in volved. Both image restoration and image en hancement can upgrade the input blurred imageto some extent. Usually, the image restorationis specialized in deblurring image caused ma…     

南大西洋风场和海浪场时空特征分析

本文根据1950～1995年共46a的南大西洋船舶气象报资料,按1*1和5*5网格统计的风、浪要素进行分析研究。通过分析每月风、浪各要素的等值线分布图,得出南大西洋风场与海浪场季节变化特点不如北半球各大洋显著,但仍有较明显的季节变化,只是季节性差异较小,冬季风比夏季风强盛,相应的平均波高、大浪大涌频率也较大;盛行风向、风浪传播方向、涌浪传播方向基本一致,低纬地区常年盛行东南浪,高纬地区则盛行偏西向浪。本文为船舶远洋交通运输、远洋出访和科学试验等活动,提供了较为翔实的风场和浪场资料及变化规律。