Use of suppressive subtractive hybridization and cDNA arrays to discover patterns of altered gene expression in the liver of dihydrotestosterone and 11-ketotestosterone exposed adult male largemouth bass (Micropterus salmoides)     

Blum JL  Knoebl I  Larkin P  Kroll KJ  Denslow ND 《Marine environmental research》2004,58(2-5):565-569

In this study male largemouth bass (LMB) were exposed to the naturally occurring androgens, dihydrotestosterone (DHT) or 11-ketotestosterone (11-KT) in order to identify genes that are differentially regulated by these steroid hormones. Using subtractive hybridization on livers of fish treated with DHT against vehicle control, many novel LMB genes were cloned. These genes were added to our gene library and arrayed. Six genes were up-regulated and five were down-regulated by both androgens. But, each androgen also regulated specific genes. One gene that was identified as a potential androgen marker was spermidine-spermine-N(1)-acetyltransferase that was up-regulated by both androgens. Determining which genes are responsive to natural androgens will help to identify biochemical pathways that are impacted.  相似文献   

A detailed survey near Mount Eratosthenes Eastern Mediterranean     

S. J. Tanner  C. A. Williams 《Marine Geophysical Researches》1984,6(2):205-222

A detailed marine survey made to the South West of Mount Eratosthenes is described. The results show the existence of a narrow zone of WNW trending deformed sediment west of the mount surrounded by an evaporite sequence in different stages of deformation.This work was intended to settle the conflict between the results of three previous interpretations of the tectonic structure of this area. We see the area being characterised by five areas with different degrees of tectonic deformation yet showing little causal relationship to overburden of Nile Cone sediments. A fault controlled cliff coincides with the previously described salt wall and strike slip fault yet we see no evidence for its diapiric origin nor positive evidence for strike slip motion along it. We concur with the previously observed area of higher free-air gravity anomalies termed the Eratosthenes tectonic zone, although it is traversed by several boundaries between areas of different deformation. Our results thus show some agreements and some re-interpretations of the observations. This complicated region is not yet fully understood however.  相似文献   

The estimation of gillnet selection curves for Atlantic herring (Clupea harengus L.) using length/girth relations     

Clarke  D. R.; King  P. E. 《ICES Journal of Marine Science》1986,43(1):77-82

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Concentration du chrome dans deux profils de l'ocean pacifique     

D. Grimaud  G. Michard 《Marine Chemistry》1974,2(3):229-237

Determination of total chromium on two profiles and chromium III on four samples of equatorial Pacific Ocean water have been carried out using coprecipitation of chromium from sea water with hydrous iron oxides, followed by ion-exchange separation and isotope dilution mass spectrometry. Results for two Pacific profiles show increasing total chromium concentration from surface to 250 m. The Cr concentration appears to be different below 1,000 m, with nearly homogeneous concentrations for the first profile and regularly increasing Cr concentrations from 0.330 to 0.550 μg/l at 3,900 m for the second one. Results for Cr(III) show that trivalent species are dominant in these samples.  相似文献   

Algal blooms in high turbidity, a result of the conflicting consequences of turbulence on nutrient cycling in a shallow water estuary     

R. Fichez  T.D. Jickells  H.M. Edmunds 《Estuarine, Coastal and Shelf Science》1992,35(6)

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Algorithm for non-hydrostatic dynamics in the Regional Oceanic Modeling System     

Y. Kanarska  A. Shchepetkin  J.C. McWilliams 《Ocean Modelling》2007,18(3-4):143-174

A non-hydrostatic algorithm for the Regional Oceanic Modeling System (ROMS) is proposed. It is based on a decomposition technique for hydrostatic and non-hydrostatic pressure. The algorithm has a pressure-correction scheme with split-explicit time-stepping for baroclinic and barotropic vertical modes with a free surface. The algorithm implementation requires solving a Poisson equation for a non-hydrostatic pressure that has a non-symmetric matrix in discrete form. The efficiency of a different class of solvers and preconditioners were tested. The algorithm is successfully implemented with several examples where non-hydrostatic effects are important. These include standing external gravity waves; strongly nonlinear internal wave generation and transformation; stratified shear instability and its associated mixing; and nonlinear internal tidal generation over a ridge. The corresponding changes in the pre-processing and post-processing infrastructure in the existing hydrostatic ROMS code were performed to implement parallel elliptic solvers and a new set of dynamical equations.  相似文献   

Comparison between zooplankton data collected by the Continuous Plankton Recorder survey in the English Channel and by WP-2 nets at station L4, Plymouth (UK)     

Eurgain H. John  Sonia D. Batten  Roger P. Harris  Graeme C. Hays 《Journal of Sea Research》2001,46(3-4)

Zooplankton sampling has been carried out by the Continuous Plankton Recorder (CPR) survey since the 1930s enabling the study of long-term changes in plankton populations, the elucidation of seasonal patterns of abundance, and more recently providing zooplankton biomass estimates for ecosystem models. Data for zooplankton abundance collected by CPR tows in the Western English Channel (between 1988 and 1998) were compared to vertically integrated samples collected from station L4 off Plymouth, UK. Comparisons were made for locally abundant copepods (including Acartia, Calanus, Para/Pseudocalanus, Centropages, Oithona and Temora) collected by CPR and WP-2 nets. All dominant species recorded at L4 were also common to the CPR data. However, the position of the taxa in the two datasets was not equivalent. Seasonal cycles revealed by CPR data were significantly similar to those recorded throughout the water column at L4 for most taxa. However, absolute levels of abundance differed for the two datasets: abundances were underestimated by CPR samples when compared to those of vertically integrated samples by a factor of between 2 and 35, with the exception of Centropages. The differing mesh sizes (200 and 270 μm) of the WP-2 net and CPR mesh could only partially explain these differences in abundance, implying that the behaviour of individual taxa and their depth in the water column also influenced the abundance recorded.  相似文献   

The wadic project: A comprehensive field evaluation of directional wave instrumentation   总被引：1，自引：0，他引：1  

J. Allender  T. Audunson  S. F. Barstow  S. Bjerken  H. E. Krogstad  P. Steinbakke  L. Vartdal  L. E. Borgman  C. Graham   《Ocean Engineering》1989,16(5-6)

The results of a comprehensive field trial of nearly all commercially available directional wave measurement systems at the Edda field in the North Sea during winter 1985-86 are presented. The results summarize the accuracy of the principal engineering wave parameters from each system and the dependence on sea state. Limiting factors on system performance and operational problems are also included in the assessment. Overall experience has been good with systems utilizing widely different measurement principles returning consistent results.  相似文献   

The Feni Drift: The importance and meaning of slump deposits on the eastern slope of the Rockall Bank     

J.C. Faugeres  E. Gonthier  F. Grousset  J. Poutiers 《Marine Geology》1981,40(3-4):M49-M57

Sedimentary facies of cores from the eastern side of the Rockall Bank and the Feni Drift (55°–58°N) have been studied. They confirm the existence of slumping which contributes only in small part to drift build-up.

These slumps occurred at different episodes during last Glacial and early Post-Glacial periods. They are sandwiched in between more important turbidites, and are found in places where the drift lies against the slope and so is acted upon by continental-rise sedimentary processes. The sea level rise periods with ice melting seems to favour gravity flow release.  相似文献   

Coastal bottom boundary layers and sediment transport: P. Nielsen. World Scientific Publishing Co. Pte. Ltd., Singapore, 1992, ISBN 981-02-0473-6, paperback, xxiii + 324 pp.     

Myrhaug D. Trondheim 《Coastal Engineering》1993,20(3-4)

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