Genetic characteristics of broodstock collected from four Norwegian coastal cod (Gadus morhua) populations     

Dahle  G.; Jorstad  K.E.; Rusaas  H.E.; Ottera  H. 《ICES Journal of Marine Science》2006,63(2):209-215

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Habitat and leaf cytogenetic characteristics of Deschampsia antarctica Desv. in the Maritime Antarctica     

I.Yu. Parnikoza  N.Yu. Miryuta  D.N. Maidanyuk  S.A. Loparev  S.G. Korsun  I.G. Budzanivska  T.P. Shevchenko  V.P. Polischuk  V.A. Kunakh  I.A. Kozeretska   《Polar Science》2007,1(2-4):121-128

Antarctic hairgrass (Deschampsia antarctica Desv.) was studied in the Maritime Antarctica with respect to general ecological characteristics, soil conditions, viral contamination, cell nucleus area, and relative DNA content. Material was gathered in six localities that were highly diverse in terms of the nature of soil-like substrata, presence of viral antigen determinants, and the average nucleus area and relative DNA content in leaf epidermis and parenchyma cells. Our results show that Antarctic hairgrass lives upon soils that are variable with respect to trace elements, pH, and other soil characteristics. The hairgrass is susceptible to a number of viruses, and shows substantial variation in DNA content and nucleus size.  相似文献   

Are there really superposed Mohos in the southwestern Alps? New seismic data from fan-profiling reflections   总被引：1，自引：0，他引：1  

F. Thouvenot  A. Paul  J. Fréchet  N. Béthoux  L. Jenatton  R. Guiguet 《Geophysical Journal International》2007,170(3):1180-1194

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海洋物探方法技术在工程勘查领域的应用   总被引：1，自引：0，他引：1  

肖都 《物探化探计算技术》2007,(Z1)

在简述多波束测深、侧扫声纳、单道反射地震以及磁测等海洋物探方法特点的基础上,通过人工鱼礁和水产养殖区调查,填海和航道疏通工程,海洋地质构造勘查,海底管线探测和沉船定位等工程勘查实例,展示出应用海洋物探技术在工程勘查领域内所获得的成果。  相似文献   

Geophysical investigations of buried Quaternary valleys in Denmark: an integrated application of transient electromagnetic soundings, reflection seismic surveys and exploratory drillings   总被引：1，自引：0，他引：1  

Flemming Jrgensen  Holger Lykke-Andersen  Peter B. E. Sandersen  Esben Auken  Egon Nrmark 《Journal of Applied Geophysics》2003,53(4):215

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High-Resolution Seismic Reflection Profiling of the Fenhe Fault in Taiyuan City     

You Huichuan  He Zhengqin  Ding Zhifeng  Wu Jianping  Wu Qingju 《中国地震研究》2003,17(1):73-84

In this paper, we demonstrate the high-resolution seismic reflection data for a depth range of several hundred meters across the Fenhe fault in Taiyuan city, China. In combination with the relevant borehole logs, these data provide useful constraints on the accurate position, geometry and deformation rate of the fault, as well as the kinematics of recent fault motion. The highresolution seismic reflection profiling revealed that the western branch of the Fenhe fault is a high angle, eastward dipping, oblique-normal fault, and cutting up to the lower part of the Quaternary system. It was revealed that the top breaking point of this fault is at a depth of～70m below the ground surface. A borehole log across the Fenhe fault permitted us to infer that there are two high-angle, oppositely dipping, oblique-normal faults. The eastern branch lies beneath the eastern embankment of the Fenhe river, dipping to the west and cutting into the Holocene-late Pleistocene strata with a maximum vertical offset of～8m. Another borehole log across the northern segment of the Fen]he fault indicates that the western branch of this fault has cut into the Holocene-late Pleistocene strata with a maximum vertical offset of～6m. The above-mentioned data provide a minimum average Pieistocene-Holocene vertical slip rate of 0.06～0.08mm/a and a maximum average large-earthquake recurrence interval of 5.0～6.7ka for the Fenhe fault.  相似文献   

Orogenic structure of the Eastern Alps, Europe, from TRANSALP deep seismic reflection profiling     

Ewald Lüschen  Bernd Lammerer  Helmut Gebrande  Karl Millahn  Rinaldo Nicolich  TRANSALP Working Group 《Tectonophysics》2004,388(1-4):85

The TRANSALP Group, comprising of partner institutions from Italy, Austria and Germany, acquired data on a 340 km long deep seismic reflection line crossing the Eastern Alps between Munich and Venice. Although the field work was split into four campaigns, between fall 1998 and summer 2001, the project gathered for the first time a continuous profile across the Alps using consistent field acquisition and data processing parameters. These sections span the orogen itself, at its broadest width, as well as the editor Fred Davey and the two adjacent basins. Vibroseis and explosion data, complementary in their depth penetration and resolution characteristics, were obtained along with wide-angle and teleseismic data. The profile shows a bi-vergent asymmetric structure of the crust beneath the Alpine axis which reaches a maximum thickness of 55 km, and 80–100 km long transcrustal ramps, the southward dipping ‘Sub-Tauern-Ramp’ and the northward-dipping ‘Sub-Dolomites-Ramp’. Strongly reflective patterns of these ramps can be traced towards the north to the Inn Valley and towards the south to the Valsugana thrust belt, both of which show enhanced seismicity in the brittle upper crust. The seismic sections do not reveal any direct evidence for the presence of the Periadriatic Fault system, the presumed equivalent to the Insubric Line in the Western Alps. According to our new evolutionary model, the Sub-Tauern-Ramp is linked at depth with remnants of the subducted Penninic Ocean. The ‘crocodile’-type model describes an upper/lower crustal decoupling and wedging of both the European and the Adriatic–African continents.  相似文献   

Beringia as an Ice Age genetic museum     

Beth ShapiroAlan Cooper 《Quaternary Research》2003,60(1):94-100

Thousands of Late Pleistocene remains are found in sites throughout Beringia. These specimens comprise an Ice Age genetic museum, and the DNA contained within them provide a means to observe evolutionary processes within populations over geologically significant time scales. Phylogenetic analyses can identify the taxonomic positions of extinct species and provide estimates of speciation dates. Geographic and temporal divisions apparent in the genetic data can be related to ecological change, human impacts, and possible landscape mosaics in Beringia. The application of ancient DNA techniques to traditional paleontological studies provides a new perspective to long-standing questions regarding the paleoenvironment and diversity of Late Pleistocene Beringia.  相似文献   

Phylogeny, diet, and habitat of an extinct ground sloth from Cuchillo Curá, Neuquén Province, southwest Argentina     

Michael Hofreiter  Julio L. Betancourt  Alicia Pelliza Sbriller  Vera Markgraf  H. Gregory McDonald 《Quaternary Research》2003,59(3):364-378

Advancements in ancient DNA analyses now permit comparative molecular and morphological studies of extinct animal dung commonly preserved in caves of semiarid regions. These new techniques are showcased using a unique dung deposit preserved in a late glacial vizcacha (Lagidium sp.) midden from a limestone cave in southwestern Argentina (38.5° S). Phylogenetic analyses of the mitochondrial DNA show that the dung originated from a small ground sloth species not yet represented by skeletal material in the region, and not closely related to any of the four previously sequenced extinct and extant sloth species. Analyses of pollen and plant cuticles, as well as analyses of the chloroplast DNA, show that the Cuchillo Curá ground sloth browsed on many of the same herb, grass, and shrub genera common at the site today, and that its habitat was treeless Patagonian scrub-steppe. We envision a day when molecular analyses are used routinely to supplement morphological identifications and possibly to provide a time-lapse view of molecular diversification.  相似文献   

电磁阵列剖面-大地电磁联合测量及其资料处理   总被引：1，自引：0，他引：1       下载免费PDF全文

邓前辉  陈木森 《地震地质》1998,20(3):59-254

电磁阵列剖面（ＥＭＡＰ）与大地电磁（ＭＴ）联合测量是在作ＥＭＡＰ测量的同时获得一个大地电磁测深点的测量结果。其优点是：（１）测量剖面不仅获得ＥＭＡＰ资料,而且还获取完整的ＭＴ资料,增加了测量的信息量;（２）弥补了单纯ＥＭＡＰ测量时深部信息可能不足的缺陷;（３）提供了ＥＭＡＰ与ＭＴ综合研究的最佳资料  相似文献