水生生物的

From the viewpoint of protecting aquatic biotope, fish is deemed as target of river aquatic biology.

从保护河道内水生生物的角度出发，以鱼类为河道水生生物的指示物种。

Better diaphaneity and DO, lower velocity of flow, with abundant aquatic biology were also found to be propitious to form complex biofilm, and to the enrichment of phosphorus and nitrogen in the biofilm.

较高的水体透明度、溶解氧水平，较低的水体流速，以及丰富的水生生物的存在有利于形成结构较复杂的生物膜，利于天然水体中生物膜对水体中氮磷的富集。

Based on toxicity mechanism, a QSAR model was established and used to explain the toxicity of organic chemicals to fathead minnow and Photobacterium phosphoreum, which showed good relationships with wide range of organic compounds.

根据毒性机理，从理论上推导出有机物的定量结构—活性方程，并用来解释有机物对呆鲦鱼和发光菌的毒性，成功地阐述了有机物对水生生物的毒性机制，区分了有机物对不同生物的毒性的联系和区别，为有机物生物活性预测提供了新的思路。

Combined the cases in China , the important roles of hydrobiology in the studies on systemic phylogeny, geographic distribution, biological and economy have been illustrated.

本课程是主要介绍水生生物的形态和分类，并以此来研究各种生物在分类系统中的地位，掌握鉴别的方法和步骤，用来探讨生物的系统演化、地理分布、生物学和经济意义等等。

The acute toxicity of three kinds of typical chemicals to alga、cladoceza and swordtail fishwere studied, and safety assessment was also made.

采用水体中3个营养级别的水生生物测试卤代酚类、硝基苯类、烷基苯类典型有毒有害化学品对水生生物的急性毒性，同时对上述物质对水生生物的安全性进行初步评估，并预测了上述物质对水生生物的环境安全浓度。

The injury effects of tributyltin on aquatic organisms were summarized,including the imposex of gastropoda femald snails,reduced photosynthesis and respiration,destroyed SOD,alkaline phosthatase,aaciphosohatse activities of aquatic organisms,destroyed genome DNA of mollusk.

综述了三丁基锡对水生生物的毒理学效应，认为主要表现在干扰海产腹足类的内分泌而诱导性畸变现象的产生，抑制微藻的光合作用和呼吸作用，破坏水生动物超氧化物歧化酶、酸性磷酸酶、碱性磷酸酶等蛋白质的活性，对软体动物的DNA造成不同程度的损伤。

The organic materials of source rock are mainly from terrigenous plants combined with abundant aquatic organisms input, which reflects the mixed-source of organics input of terrigenous plants and hydrophilous alga.

烃源岩有机母质均以陆生高等植物输入为主，也有水生生物的输入，反映原始母质具有水生生物和陆源高等植物混源的特征。

WASHINGTON - Scientists unearthed a skull of the most primitive four-legged creature in Earth's history, which should help them better understand the evolution of fish to advanced animals that walk on land. The 365 million-year-old fossil skull, shoulders and part of the pelvis of the water-dweller, Ventastega curonica, were found in Latvia, researchers report in a study published in Thursday's issue of the journal Nature. Even though Ventastega is likely an evolutionary dead-end, the finding sheds new details on the evolutionary transition from fish to tetrapods. Tetrapods are animals with four limbs and include such descendants as amphibians, birds and mammals.

华盛顿-科学家挖掘出一副地球历史上最原始的四足生物头骨，这个有利于帮组他们更好理解鱼类进化成为更先进的陆地行走生物，这个有着三亿六千五百万年年龄的头骨，肩膀和水生生物的一部分骨盆，Ventastega curonica，在Latvia被发现，研究者一篇研究报告发表在在星期三出版的自然杂志上，尽管Ventastega 可能是一个进化的死胡同，这个发现给出了从鱼类到四足动物进化变迁过程的新细节，四足动物是使用四肢的动物并且包括下属的比如两栖类动物，鸟类和哺乳类动物。

This study examines the criteria of water temperature for black carp, grass carp,silver carp, bighead, common carp, etc in the condition of thermal shock.The paper reported the optimum growth temperatures,the maximum lethal temperatures and the short exposure maximum high temperatllres for these fishes.All the criteria can be considered as appraisal values of water temperature for thegrowth and breeding of these fishes.

为保护水域生态环境的平衡，合理利用水资源和为制定发电厂热水排放的温度标准，提供有关水生生物的温度基准值，对青鱼、草鱼、鲢、鳙和鲤等七种主要淡水经济鱼类作了温度基准值的研究，提出了最适生长温度，最大致死温度及短期暴露最大高温等基准值，以作为确保水生生物能正常生长与繁殖情况下，环境温度的评价标准。

The results indicated that phenols were the pollutants with high toxicity, in which pentachlorophenol had the highest toxicity in all these tested chemicals.

研究结果表明，在3类12种有机污染物中，卤代酚类物质对水生生物的毒性最强，其中五氯苯酚对水生生物具有极高毒性。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。