抛石防波堤混凝土栅栏板护面块调查报告

为进一步了解栅栏板在海岸工程中使用情况,我们于今年五、六月份赴青岛、大连有关设计、施工和使用单位进行了现场参观学习和调查,并和这些单位有关工程技术人员进行了座谈讨论。栅栏板继在青岛交通部北海船厂防波堤后坡、海军某工程西防沙堤及东护岸投入使用后,又先后在大连石油七厂海坝接长工程、南护岸扩建工程及大连化工厂码头盐场扩     

Analysis of medaka cytochrome P450 3A homotropic and heterotropic cooperativity

We have previously demonstrated that medaka CYP3A is associated with metabolism of several endobiotics including steroids and bile acids. In this study, we demonstrate that medaka CYP3A catalysis exhibits unusual kinetic behaviors consistent with allosteric interaction which cannot be described by hyperbolic kinetic models. Using 7-benzyloxy-4-(trifluoromethyl)-coumarin (BFC) and nonylphenol as CYP3A substrates, we describe both homotropic and heterotropic cooperative interactions. Given the role of CYP3A in maintaining the homeostatic balance for numerous endobiotics, enzymatic activation/inhibition by endocrine disruptors (EDCs) represents a putative (non-genomic) mechanism for endocrine disruption.     

Partitioning of polycyclic aromatic hydrocarbons between water and particles compared to bioaccumulation in mussels: a harbour case

Water and particles from three sites located in Halifax Harbour, near and further away from combined municipal sewage effluents (CMSE) were analysed for parental and alkylated polycyclic aromatic hydrocarbons (par and alkPAH). Bioavailability of PAH was compared for inter-tidal mussels collected at the same sites in April and November. The PAH fingerprint determined over 9 sampling times covering a period of 19 months differed more between phases (water and particles) and seasons, than between sites. In the spring, more alkPAH associated with diesel and gasoline were detected in the soluble phase, along with more bioaccumulation of alkPAH in inter-tidal mussels. A broader number of parPAH were detected in mussels collected in the fall. The mean sum of dissolved alkPAH concentrations was higher in water at the site closer to raw CMSE than at the other two sites and particles of that site. However, lowest bioconcentration factors (BCF) were determined in mussels of this more contaminated site. Similar biota-particle accumulation factors (BPAF) were determined for parPAH in mussels from the three sites, all lower than the BCF of alkPAH. The study indicates that sewage treatment plants will reduce the amount of parPAH especially larger than fluoranthene and pyrene from being deposited in the harbour; that alk naphthalenes and fluorenes present in water will continue to be discharged; that the disturbance of sediments can make particle-bound PAH available to mussels.     

9711号北上台风演变及暴雨过程的位涡诊断分析

通过对 971 1号台风登陆北上穿过山东造成山东特大暴雨过程的湿位涡的分析 ,并从湿位涡的角度研究了台风演变及山东特大暴雨的形成机制 ,揭示了冷空气在台风演变及暴雨过程中的重要作用。结果表明 :倾斜涡度发展是暴雨产生和台风加强的重要机制之一 ,暴雨产生在 θe线陡立密集区内 ;湿位涡在这次暴雨过程中对流层低层具有 MPV1 <0 ,MPV2 >0的特征 ,此次暴雨产生在负的MPV1等值线密集区中 ;对流层上部及平流层下部高位涡的下传使得低层斜压性增大 ,引起低层的对流稳定度减小 ,促使气旋性涡度发展 ,有利于位势不稳定能量的释放 ,使得暴雨增幅 ,导致台风的加强并演变为温带气旋。     

中国近海鸭嘴蛤科的分类研究

鸭嘴蛤科(Laternulidae)的种类,广泛分布在我国沿海,数量很多。其肉可供食用,亦可作家畜、家禽、鱼虾类的饲料和农用肥料,具有一定的经济价值。 本科的主要特征是:外形似鸭嘴状,壳质薄脆、半透明,具云母光泽。两壳壳顶紧密接近,各具横裂一条。壳表无放射肋,具有同心生长纹和粒状突起。铰合部无齿,但具从壳顶斜行向后的薄片隔板。韧带槽呈匙状,韧带介于其中。大多数种类在匙槽前方,具有     

产后雌鳗再生殖的可能性

从1973年开始,我们对产后雌鳗再生殖的可能性进行了研究,发现产后亲鳗并不象过去许多人认为的那样必然死亡,恰恰相反,多数能够成活。 1977年以后,我们有意识地用海水和淡水对产后雌鳗进行了饲养,观察并探索其再次繁殖的可能性,得出一些有意义的结果。现报道如下。     

罗氏沼虾育苗用水中Mg2+与Ca2+含量及Mg2+/Ca2+对出苗率的影响

１９９１年３－６月和１９９２年３－６月在南汇县东海水产养殖公司对罗氏沼虾育苗用水调配原则与不同基础水的调配方法进行试验研究。结果表明，育苗用水中Ｍｇ＾２＋与Ｃａ＾２＋含量及Ｍｇ＾２＋／Ｃａ＾２＋必须达到一定的范围，这是调配的基本原则。以鱼塘水作基础水时，需添加６种化学药品，其中Ｍｇ＾２＋与Ｃａ＾２＋含量可适范围分别为３００．０－４４０．０ｍｇ／Ｌ与１７０．０－２４４．０ｍｇ／Ｌ，Ｍｇ＾２＋／Ｃａ＾     

澳南极生物研究讨论会在京斯敦召开

澳大利亚南极生物研究讨论会于1984年8月13-18日在塔斯马尼亚(Tasmania)州的京斯敦(Kingston)召开.会议由澳科技部南极局发起,对维斯特福尔德(Vistfold)山地已开展的生物研究,进行一次全面系统的讨论和经验总结.参加会议的除了澳大利亚科学家外还有中国、日本、印度和南非等国共50多名科学家.会上共宣读论文40篇,张     

云南米虾研究及新种的描述

本文报道了云南省的米虾共9种,其中包括4新种。标本采于1983年3—6月。其新种为:1.滇池米虾:额角上缘和后缘的齿均多,且其末端有1/3—1/2的无齿区。2.异指米虾:额角上、下缘的齿均多,第三步足雄性指节较雌性宽阔,且刺也显著粗大。3.长棍米虾:第二腹肢的雄性附肢特别延长而多刺。4.喻氏米虾:额角下缘齿数显著多于葛氏米虾。     

珠江口海区海水污染状况的模糊聚类分析

在海洋环境污染调查研究中,人们往往企图通过一些数学表达式把环境质量状况客观地反映出来,用以制定研究海域的污染程度。就方法而论,一般都采用污染物的实测浓度与污染物允许浓度标准之比值作为最基本的质量指数,将污染物的质量分指数综合成要素的质量分指数,然后再综合成总质量指数。较为常用的有迭加法、平均值法、