螺旋藻多糖和糖蛋白的提纯及其理化特性研究   总被引：6，自引：0，他引：6  

胡群宝  郭宝江 《海洋科学》2001,25(7):41-44

采用改进的人螺旋藻中提取多糖和糖蛋白。经恒温加热去蛋白后，用EDAE－52柱层析后得到一种多糖和两种糖蛋白，经Sephadex G-100和凝胶电泳证实所得的多糖和糖蛋白为组的一组分。采用凝胶过滤法测定的多糖近似分子量为19500。由SDS－PAGE测定分子量糖蛋白GS－1的分子量为14900，GS－2的分子量为18400。红外光谱呈现出典型的多糖吸收峰，含有α－型糖苷键。β消去反应初步证明所提取的两种糖蛋白可能是O－连续的糖蛋白。  相似文献   

一种新的波浪变形三维数值模式──0-1混合型边界元   总被引：4，自引：0，他引：4  

孙大鹏  李玉成 《海洋学报》2000,22(3):44-48

为提高边界元法模拟三维波场波浪变形的数值计算精度,借鉴常数元和线性元剖分方式、波势函数及波势函数法向导数对单元节点设定的各自适应性,提出了一种新的单元剖分模式──0-1混合型边界元,以控制和减缓由于计算误差累计而造成的波浪数值计算上的“横向振动”,借此结合边界元法的分区模式可实现较大范围的波场线性波浪变形计算,并为时域内的波浪非线性变形计算提供时间步长的数值保证.  相似文献   

非线性洋面温度反演     

吴雪宝  邱康睦 《海洋预报》1996,13(4):22-26

本文从辐射方程出发，简述洋面温度与亮度温度之间的非线性关系，进行非线性洋面温度反演的方案设计，用正演算法 计算出非线性洋面温度反演公式的回归系数，对样进行检验。  相似文献   

一种新型测向传感器——磁通门罗盘     

胡平  孟宪萍  江钩仁 《海洋与湖沼》1992,23(3):318-324

本文对磁通门罗盘的基本工作原理、实验线路以及主要技术指标和一些测量数据作简要介绍,最后对仪器的误差进行简单分析并提出一些减小误差的改进措施。  相似文献   

Tantulocarida (Crustacea: Maxillopoda): A New Taxon from the Temporary Meiobenthos1     

Rony Huys 《Marine Ecology》1991,12(1):1-34

Abstract. Two new genera of Tantulocarida are described from the Ligurian deep sea (Western Mediterranean) off Corsica. Xenalytus scotophilia is referred to the Microdajidae and differs from Microdajus GREVE in thoracopodal segmentation as well as in the presence of coupling spines on thoracopod 6 and longitudinal lamellae on the cephalic shield. Aphotocentor styx is placed in the Deoterthridae and holds an intermediate position between Deoterthron BRADFORD & HEWITT and Boreotantulus HI/YS & BOXSHALL. Some aspects of cephalon internal structure are described for the first time and give a possible explanation for the mechanism of stylet protrusion. The external structures of the oral disc are described using SEM. The discovery of well-developed muscles in the trunk and thoracopods is discussed in the light of the benthic phase the tantulus passes through. The boundary between the thorax and abdomen in the tantulus is reinterpreted, corroborating the 5–7-5 bodyplan of the hypothetical urmaxillopodan as found in the Upper Cambrian Skaracarida and possibly also Dala peilertae MOLLER. Some aspects related to dispersal, infection, and feeding are reinterpreted or approached from a different perspective. SEM of Microdajus langi GREVE gives evidence that the tantuli hatch via a conspicuous slit located at the posterior end of the female trunk sac. A worldwide key to the tantulocaridan families and genera is given, and distributional records are compiled. It is suggested that Tantulocarida might be common representatives of the temporary meiobenthos and that their present species number represents only the tip of the iceberg.  相似文献   

台湾暖流起源的研究     

苏志清  钱清瑛 《中国海洋大学学报(自然科学版)》1988,(1)

根据台湾东北海域的水文资料分析,作者对台湾暖流起源提出以下看法:台湾暖流起源于黑潮分支和台湾暖水,黑潮分支为主要源泉。台湾暖流的深层水完全来自黑潮分支的深层水,不具有暖流性质,而其上层水是由黑潮分支的上层水和台湾暖水组成。由于台湾暖水有明显的季节变化,与此相应,台湾暖流也发生相应的变化。  相似文献   

A New Pursuit Mode of Nonlinear Wave Surface     

孙大鹏李玉成  郭海滨 《中国海洋工程》2004,18(2):257-266

The numerical mode of nonlinear wave transformation based on both the Laplace equation for water field and the Bemoulli equation for water surface is a kind of time-domain boundary problem with initial conditions. And the basis for establishing the numerical mode of nonlinear wave in time domain is to trace the position of wave free surface and to calculale the instantaneous surface height and surface potential function. This paper firstly utilizes the ‘0-1‘ combined BEM to separate the boundary by means of discretization of Green‘ s integral equation based on the Laplace equation, then separates the free surface of wave with FEM and derives the FEM equation of wave surface that satisfies the nonlinear boundary conditions. By jointly solving the above BEM and FEM equations, the wave potential and surface height could be obtained with iteration in time domain. Thus a new kind of nonlinear numerical mode is established for calculating wave transformation. The wave test in the numerical wave tank shows that the numerical simulation with this mode is of high accuracy.  相似文献   

渤海湾表层沉积物重金属与污染评价   总被引：10，自引：2，他引：10       下载免费PDF全文

秦延文  苏一兵  郑丙辉  张雷  万峻 《海洋科学》2007,31(12):28-33

用原子吸收法测定了渤海湾表层沉积物中重金属的含量,同时用2种评价方法对该海域底质环境进行了评价。结果表明:沉积物中汞、锌含量平均值超过标准,其余项目未发现超标;其分布特征由于受沿岸不同污染源的污染影响,重金属污染物难以形成一定规律的分布状态。同时该海域底质环境质量总指数已达到污染程度和很强的生态危害,其中主要污染元素是Hg,已达重污染,并形成极强的生态危害。  相似文献   

东海区近海强风预报模式     

杨良华 《海洋预报》1995,12(4):34-42

本文探讨东海区近海强风预报模式，首先介绍建立预报模式的思路和步骤，及使用说明，为了验证强风预报模式和判别条件，用１９８６、１９８７上日本传真天气图进行试报，准确和基本准确度为９１．１％，并给出了１９８９、１９９５年随船试验预报结果，准确和基本准确率为９０％以上。  相似文献   

紫菜一新种——福建紫菜的研究          下载免费PDF全文

章景荣  王素娟 《海洋与湖沼》1993,24(4):356-359

于1978年1月在福建莆田县乐屿岛采集紫菜属标本,进行分类研究。经鉴定表明,其中一种系新种,定名为福建紫菜Porphyra fujianensis sp.nov.。分类方法见曾呈奎等(1962)。本种特征为:藻体长带状,边缘细胞为刺缘型;雌雄同体,精子囊器与果孢子囊成条状或块状,混生或呈镶嵌式分布,形似条斑紫菜;精子囊器分裂式为(?)A_4B_4C_4,果孢子囊分裂式为♀A_2B_4c_2;藻体产生单孢子,进行无性繁殖。模式标本存放于厦门水产学院养殖系。  相似文献