Cytochrome P450 differences in normal and imposex-affected female whelk Buccinum undatum from the open North Sea

Normal and imposex-affected female Buccinum undatum were sampled from the open North Sea at three locations, one with low, and two with high shipping densities. Cytochrome P450 components and P450 aromatase activity were determined in the microsomal fractions isolated from pooled digestive gland/gonads. Cytochrome P450 aromatase activity was significantly higher (P < 0.05) in normal females collected in the low shipping density area (1,325 +/- 295 fmol/h/mg protein) than levels from imposex animals from a high shipping density area (620 +/- 287 fmol/h/mg protein). A negative correlation was found between aromatase activity and organotin body burden (r = -0.99). Levels of CYP450, cytochrome b5 and NADPH cytochrome c reductase activity did not show differences among groups. This is the first field evidence of depressed aromatase activity in imposex affected females, although additional research under laboratory controlled conditions is required to fully understand the mechanisms underlying the development of imposex in this species.     

近岸水域CZCS的资料分析

Ｎｉｍｂｕｓ－７卫星上的多通道扫描辐射计－海岸带水色扫描仪，被设计用来提供海洋近表层浮游植物素浓度和其他与水色有关现象的资料。由于自然和人为的排放以及由潮流引起的再悬浮沉积的影响，对近岸水域遥感资料的分析存在一定的困难，对于近岸水域应作出慎重的研究，因为此类水域的生物－海洋学状况具有较大变化性。     

基于3D WebGIS的苕溪流域防汛决策支持系统研究

本文以浙江省苕溪流域为例，论速了在三维软件技术、网络技术扣数据库技术的支持下，基于SKYLINE软件平台构建苕溪流域汛情形势会商GIS三维平台。     

一次强对流天气的雷达回波特征分析

利用烟台新一代天气雷达资料，结合自动气象站和常规观测资料，分析了2004年5月16日山东半岛西部强对流天气背景和雷达回波特征。结果表明：此次强对流天气是由高空低涡和地面气旋造成的，在雷达径向速度图上，有中气旋特征，并与地面风场相对应。     

新疆伊吾县马依当地区二叠纪地层的发现及其意义

在新疆伊吾煤矿一带1:5万区域地质矿产调查中,首次在原定石炭系上统妖魔梁组中发现大量透镜状钙质结核,并具明显的陆相冲积扇沉积特征;通过该地层的大量孢粉鉴定属为二叠世晚期,故将原石炭系上统妖魔梁组更名改为库莱组。其时代定为晚二叠世。并初步探讨了它的地质意义。     

土-结构相互作用地震反应分析软件及其二次开发

本文简要介绍了目前在土-结构相互作用分析中常用的有限元软件ANSYS7.0、FLAC和MSC.M arc,通过比较评价其各自优缺点和适用性后,根据高层建筑结构土-结构相互作用地震反应分析的特点,建议利用带有灵活接口的大型非线性有限元分析软件MSC.M arc作为其分析工具,并尝试对MSC.M arc进行二次开发,将多层土E-B本构关系模型作为子程序加入其中。     

Hypoxia in the East China Sea: one of the largest coastal low-oxygen areas in the world

Anoxia and hypoxia have been widely observed in estuarine and coastal regions over the past few decades; however, few reports have focused on the East China Sea (ECS). In June and August 2003, two cruises sampled at stations covering almost the entire shelf of the ECS to examine hypoxic events and their potential causes. In August, DO concentrations <2-3 mg l(-1) covered an area estimated at greater than 12,000 km(2) (or 432 km(3) volume). In contrast, water column DO concentrations exceeded 4 mg l(-1) throughout most of the shelf region. A sharp density gradient was observed under the mixed layer in August, restricting vertical re-aeration across this strong pycnocline. Oxygen depletion events, such as that described here for the ECS shelf, are fueled by decomposition of newly produced marine and river-borne biogenic substances (as well as older residual organic matter) deposited to the bottom waters.     

2008年8月两次强降水天气过程对比分析

2008年8月17～18日以及21～22日,受黄淮气旋影响,山东境内相继两次发生强降水天气过程。本文采用大尺度特征分析和数值产品应用和检验的方法,对两次过程进行了对比分析。发现(1)二者产生强降水的雨强和范围不同;(2)海上副高的强度和位置不同。前者位置偏北、偏强,形状为块状,对降水有很好的阻挡作用;后者副高偏弱、偏南,呈带状,对降水系统的阻挡作用较弱;(3)地面气旋移动路径和气旋附近强降水位置不同。前者东北移动,强降水区位于气旋移动方向的第一、第二象限;后者先东移然后向东北移动,强降水区基本位于第一象限;(4)两次强降水区与低空低涡切变线前部的急流区有很好的对应关系;(5)数值预报产品对第一次强降水的预报可参考性较强,对第二次预报量级偏大,需要预报员对形势准确分析的基础上,作出订正预报。