中国东海和韩国马山湾海域2株原甲藻的形态结构和分子序列比较   总被引：2，自引：0，他引：2  

王红霞  陆斗定  黄海燕  夏平  戴鑫烽  Jeanette G 《海洋学研究》2011,29(1):42-48

对采自我国东海温岭海域和韩国南部马山湾海域的2株原甲藻进行了藻种分离、纯化培养及rDNA ITS分子序列的PCR扩增与测序,并运用显微镜、扫描电镜、Jukes-Cantor距离矩阵及构建的系统发育树,比较研究了2株原甲藻的形态结构和分子序列.结果表明:温岭藻株(LAMB090508)和马山湾藻株(PDKS0206)具有...  相似文献   

华北深部岩石圈存在弱的新元古代热活动的同位素年代学信息：证据及意义   总被引：3，自引：2，他引：1  

郑建平  平先权  夏冰  余淳梅 《岩石学报》2013,29(7):2456-2464

人们普遍认为华北区别于华南的主要特征在于缺少广泛的新元古代岩浆活动,但原因是什么还不清楚。本文汇总了华北四个地区深源岩石包体中有这样同位素年龄的结果,并就它们所反映的华北当时在Rodinia超大陆裂解中心的位置和可能的岩石圈厚度进行了讨论。这些深源岩石包体分别是辽宁复县古生代金伯利岩中的基性麻粒岩、河北涉县碳酸岩化金伯利岩中石榴石辉石岩、河南信阳中生代火山岩中的橄榄岩及河北汉诺坝新生代玄武岩中橄榄岩。所记录的新元古代年龄信息包括:复县基性麻粒岩锆石0.61Ga的下交点年龄,涉县石榴石辉石岩全岩-单矿物的0.76GaSm-Nd内部等时年龄、信阳橄榄岩锆石的新元古代(>0.64Ga)年龄以及汉诺坝橄榄岩硫化物0.9～0.6Ga的Re-Os年龄。与华南广泛发育新元古代岩浆活动不同,华北有限的新元古代年龄信息(包括地表出现的)可能反映着它们当时在Rodinia超大陆的位置有所不同,即华南更靠近于超大陆裂解的中心、而华北可能远离该中心(如边缘)。位置的差别也预示着当时华南岩石圈的可能比较薄、而华北具巨厚的岩石圈。因此,我们认为弱的热事件和巨厚的岩石圈可能是造成华北新元古代热活动不明显的原因。  相似文献   

Persistent organic pollutants and histological lesions in Mayan catfish Ariopsis assimilis from the Bay of Chetumal, Mexico     

Noreña-Barroso E  Simá-Alvarez R  Gold-Bouchot G  Zapata-Pérez O 《Marine pollution bulletin》2004,48(3-4):263-269

Livers of catfish (Ariopsis assimilis) from the Bay of Chetumal were analyzed for organochlorine compounds and hydrocarbons as part of a study to diagnose the environmental health of the Bay after a catfish mass mortality that occurred in 1996. The presence of histological lesions in several organs of the fish as result of chemical exposure was also evaluated. The concentrations of organic pollutants found in the Bay may be considered high if compared to the levels reported for sites affected by chemical pollution. High prevalences of cellular alteration histopathologies were found in liver, including hepatic tumors. The presence of some lesions may be related statistically to environmental pollution in the Bay, specially with chlorinated compounds.  相似文献   

Ancient Continents among the Accretionary Complexes of the Central Asia Orogenic Belt: in Situ Os Isotope Evidence     

WANG Kuo-Lung  S.Y. O’REILLY  Mikhail I. KUZMIN  Victor KOVACH  Sergey D''RIL  Alexandar VORONTROV  Vladimir YARMOLYUK  W.L. GRIFFIN  N.J. PEARSON 《《地质学报》英文版》2013,87(Z1):317-318

  相似文献   

Assessment of the ecological quality status of soft-bottoms in Reunion Island (tropical Southwest Indian Ocean) using AZTI marine biotic indices   总被引：2，自引：1，他引：1  

Bigot L  Grémare A  Amouroux JM  Frouin P  Maire O  Gaertner JC 《Marine pollution bulletin》2008,56(4):704-722

The ability of the two synthetic marine biotic indices, AMBI and M-AMBI, to account for changes in the ecological quality of coastal soft bottoms of Reunion Island according to disturbances was assessed from macrobenthic samples collected in five sectors between 1994 and 2004. Samples were collected under non-perturbed conditions and at two sites subjected to heavy organic enrichment. Both indices are based on a classification of macrofauna into ecological groups (EG), and their transfer to tropical waters required some adaptations. These indices proved efficient in detecting a degradation of habitat quality. Their use resulted in the classification of all sites sampled between 1996 and 1998 as "good" or "high". M-AMBI nevertheless tended to result in the attribution of a slightly worse ecological quality status than AMBI. Together with an update of the EG species list for the Indian Ocean area, our results support the extension of both indices for the assessment of tropical soft bottoms.  相似文献   

与地震活动相关的电磁扰动的空间观测     

F.  Nemec  O.  Santolik  M.  Parrot  J.  J.  Berthelier  何宇飞 《世界地震译丛》2008,(6)

介绍了地震附近甚低频（VLF）电磁波信号强度统计分析结果。统计数据全部来自法国的DEMETER卫星（轨道高度700km,近太阳同步轨道）,处理中采用了稳健的两步处理方法。第一步,利用所有的观测数据构建电磁辐射背景图,在给定条件和给定轨道位置对电场波动强度进行了统计描述。第二步,在第一步得到的电场波动强度的统计分布背景基础上,对地震附近的观测数据进行分析,研究由地震活动引起的电场波动强度的变化,评估它们在统计上的显著性。在整个分析过程中,我们总计使用了大于两年半的卫星观测数据,并对在此期间全球范围内发生的大约9000个震级大于或等于4．8的地震进行了统计分析。统计结果显示,在夜间时段,对于浅源地震（震源深度小于或等于40km）,在震前0～4小时的短时间内,电场波动强度会有4～6dB的显著降低。  相似文献   

Design of controlled elastic and inelastic structures     

A.M.Reinhorn  O.Lavan  G.P.Cimellaro 《地震工程与工程振动(英文版)》2009,8(4):469-479

One of the founders of structural control theory and its application in civil engineering,Professor Emeritus Tsu T.Soong,envisioned the development of the integral design of structures protected by active control devices.Most of his disciples and colleagues continuously attempted to develop procedures to achieve such integral control.In his recent papers published jointly with some of the authors of this paper,Professor Soong developed design procedures for the entire structure using a design-redesign proce...  相似文献   

作为热机的自然对流:CAPE理论     

N.O.Renno  A.P.Ingersoll  彭治班 《气象科技》2000,28(4)

在许多行星上,不断有热量供给地面,且热量也不断通过大气向太空发出红外辐射.由于在高压区是热源不是热汇,因此,该系统能够做机械功.大气对流是可以在此系统中运转的自然热机.基于这种热机结构,提出了一个大气对流的简单理论,预报在统计平衡状态下干、湿对流的浮力、垂直速度及其覆盖区域.在对流热机一次循环期间,来自地面层(热源,热区)的热,其中一部分被报废到空间自由对流层(热汇,冷区),并从那里辐射到太空.其余部分变为机械功.此机械功用于克服机械耗散维持对流运动上.最终,机械能耗尽,转变成热能.消耗掉的部分能量被辐射到太空,而其余的通过对流气块进入再循环.在温度较低能量消耗部分降低的情况下,温度较高能量消耗部分增加,提高了对流热机的视效率.对流热机所做的功对气柱积分,给出了存在于行星大气中克服粘性耗散、维持对流运动的对流有效位能(CAPE)统计平衡量的大小.此积分被认为是准平衡条件下行星状态的一个全球性数字.对于地球目前的气候,热机结构预报热带地区CAPE值的大小为1000 J·kg-1,该预报值与观测值一致.从结果也可得出,存在于对流大气的CAPE总量应随着全球地表温度的升高(或大气对红外辐射的暗度)的增大而增大.  相似文献   

YANSHANIAN AND HIMALAYAN EVOLUTION OF THE WESTERN TARIM AREA(XINJIANG CHINA):FROM THE JURASSIC TROUGH UP TO THE NEOGENE AND QUATERNARY FLEXURAL BASIN     

Joseph Canerot    Qu Guosheng  WT  ”BX 《地学前缘》2000,(Z1)

YANSHANIAN AND HIMALAYAN EVOLUTION OF THE WESTERN TARIM AREA(XINJIANG CHINA):FROM THE JURASSIC TROUGH UP TO THE NEOGENE AND QUATERNARY FLEXURAL BASINtheNationalNaturalScienceFoundationofChina (No ..4982 5 10 2 )  相似文献   

Late Cenozoic Tectonics Along the Northwestern Margin of the Tarim Basin: Interactions Between the Tarim Basin and the Southern Tian Shan, West China     

Chen Jie  Qu Guosheng  Shen Jun  Edward Sobel  Nan Ling  Tian Qinjian  Yin Jinhui 《地学前缘》2000,(Z1)

LATE CENOZOIC TECTONICS ALONG THE NORTHWESTERN MARGIN OF THE TARIM BASIN: INTERACTIONS BETWEEN THE TARIM BASIN AND THE SOUTHERN TIAN SHAN, WEST CHINAgrants 4 98340 50and 4 9732 0 90fromtheNSFofChina;;andproject96 913 0 7 0 1fromtheMinistryofSci enceandTechnology ,China…  相似文献