富含半胱氨酸肠蛋白的研究进展

富含半胱氨酸肠蛋白是一种含双锌指结构的小分子蛋白，其在锌离子转运、个体发育、免疫防御以及肿瘤发生等多种生理过程中发挥重要作用。作者主要对富含半胱氨酸肠蛋白的结构特点及其在发育和免疫方面的研究进展进行系统概述，并指出其相关作用机制尚待深入研究。     

海藻中类胡萝卜素抗超氧自由基活性研究

在植物组织内，类胡萝卜素除具有集光功能外，还具有其他的重要生物学功能，类胡萝卜素作为光保护剂可抵抗光、氧和光敏色素的有害作用，也可作为化学反应物抵抗细胞所产生的化学物质引起的氧化损伤，保护光合系统免受光动力敏化作用的破坏。类胡萝卜素光保护作用的主要机制如下:(1)类胡萝卜素对三重线态敏化剂的淬灭；(2)类胡萝卜素对1O2的淬灭；(3)类胡萝卜素对自由基反应的抑制，它的这种生物学活性在医学领域也具有重要的应用价值。胡萝卜素在生物系统中的保护作用包括失活由电激活的单线态氧(1O2)，失活反应性的化学物质如过氧化物自由基和烷氧基，这些自由基产生于细胞内，并可能会引起有害的氧化作用。类胡萝卜素的保护功能与直接的抗氧化活性或与对细胞内抗氧化水平的调节有关(Krinsky，1990)。对于类胡萝卜素清除脂类过氧化物自由基的能力和作用机理已经进行了详细的研究(Burton et al.，1984; Burton, 1989; Terao，1989; Palozza et al.，1992b; Tsuchihashi et al.，1995)，但对于类胡萝卜素清除超氧阴离子自由基的能力尚未见有详细研究报道。本文以邻苯三酚自氧化体系作为超氧自由基的发生体系，对海藻中分离纯化制备的类胡萝卜素清除该种自由基的能力进行了初步的探讨。     

Estimation of Axial Pile Bearing Capacity According to Shear Strength Parameters of Soil

At pesent,it is very popular to estimate pile bearing capacity by use of empirical formula andphysical indexes of soil provided in the design codes for civil construction in China.This paper attempts toapply mechanical indexes of soil and semi-empirical formulas,which are based on soil mechanical theoriesand were summarized and presented by Meyerhof in 1976,to calculate the axial pile bearing capacity.Lo-ading test results of 24 single piles in Tianjin area have been collected and compared with the proposed cal-ulation approach.     

Model Test of Sand Restraining Force on Pipeline

This paper describes the model tests for determining the axial friction and the lateral resistance of sand to pipeline by using fine sand and prototype pipeline, and the calculation method based on limit analysis theory is verified. The effect of cyclic loading is considered in the test.     

Holocene cheniers in the Yangtze Delta, China

Nineteen cheniers formed in the middle and late Holocene have been distinguished and studied.

In fair weather the wave action along the Yangtze Delta is weak, with a wave height of 0.5–1.0 m and average wave energy of 0.127 erg/s. However, in late summer and early autumn the coastal area is usually swept by typhoons, which sometimes are extremely violent. The development of cheniers is mainly controlled by these strong typhoons. As a result, a number of the sedimentary characteristics of the cheniers are related to the typhoon-generated high-energy environment.

Moreover, the study shows that the top elevation of a fully developed chenier indicates the spring high water level during a violent typhoon (11–12 on the Beaufort scale).     

Scaling analysis of deposition from turbidity currents

Many oil-bearing sedimentary deposits are formed by the settling of particles from turbidity currents. Modeling sedimentary processes that form these turbidites enables the calculation of properties such as extent, depth, porosity and permeability of hydrocarbon-bearing reservoirs. This paper estimates the extent and thickness of turbidites from the initial conditions of the turbidity flow. This is achieved by the application of scaling analysis of the partial differential equations that govern the dynamics of and deposition from turbidity currents. We apply the results of scaling analysis to five modern submarine fans. The predicted and actual values of the dimensions of the fan deposits match well. We then compare the derived results against tabulated sizes of ancient turbidites. The comparisons are good as long as we correctly identify the flow regimes in which the deposition took place. The good agreements observed in the two cases show that the estimates obtained using scaling analysis can provide useful first-guess values for the dimensions of the deposits.     

Effects of chemical ecological adjustment and control experiment on phytoplankton community in the Aoshan Bay

There is a low nutrient level in the Aoshan Bay. In June 1999, the chemical adjustmentand control experiment was made in the Aoshan Bay. Following tracts investigation was carried out before the experiment and on the 1st, 2nd, 4th, 5th, 6th and 45th day/after the experiment. While the variance of amount of phytoplankton, the replacement of superior species and the species composition of phytoplankton were researched. The results show that the amount of phytoplankton in the Aoshan Bay rises gradually after the experiment. Ceratium macroceros Cleve of pyrophyta was the dominant species before the experiment, its dominant index was 37.7％. Six days after the experiment, its dominant index dropped to 17.6％ . Meanwhile the dominant index of Asterionella japanics Cleve rose from 7.1％ to 39.2％ , it became the first dominant species. Forty-five days after the experiment, the amount of phytoplankton in the Aoshan Bay was 5.15 to 137.32 times more than that in 1997.     

东山湾贝类养殖容量的估算

以初级生产力为基础，应用营养动态模式和沿岸海域能流分析模型，估算东山湾贝类年生产量分别为269331t和295767t，平均282549t。扣除潮间带、潮下带和吊养区浮筏、随着基及延绳上附着的非养殖滤食性附着动物自然现存量35760t，贝类可养殖量为246789t。应用统计分析和逻辑斯谛种群增长模型估计贝类可养面积为11839hm^2，其中缢蛏635hm^2，石蛎1160hm^2,吊蛎1525hm^2，翡翠贻贝633hm^2，菲律宾蛤仔1154hm^2，扇贝698hm^2，江瑶248hm^2，泥蚶601hm^2，巴非蛤4151hm^2，凸壳肌蛤1034hm^2。1998年实际养殖面积和养殖产量分别为10581hm^2和220564t。尚有1258hm^2,26225t的扩大开发潜力。文中还讨论了合理布局和优化养殖结构问题。     

魁蚶线粒体16S rRNA和COI基因片段序列测定及其应用前景

魁蚶（Ｓｃａｐｈａｒｃａｂｒｏｕｇｈｔｏｎｉｉ）是蚶科贝类的一种大型经济种类，主要分布于我国、日本和朝鲜半岛及俄罗斯东南部沿海。在我国，主要分布于辽宁、河北和山东沿海，生活在３～５０ｍ（多为２０～３０ｍ）水深的软泥或泥沙质海底，是我国北方沿海重要的经济贝类之一。但但有有关关其其自自然然群群体体的的遗遗传传变变异异及及群群体体间间遗遗传传分分化化等等方方面面的的研研究究不不多多 ;;同同时时，，作作者者和和日日本本研研究究者者发发现现，，中中国国、、韩韩国国和和日日本本魁魁蚶蚶群群体体在在形形态态和…     

珠江口东南近海海区污损生物研究

为研究珠江口东南近海海区污损生物状况,于1986年5月至1987年6月,在香港东南约114和160km,水深为95和113m处布设了两个生物浮标站,并对距香港约172km,水深为115m处的Marex水文气象浮标上的污损生物群落进行调查.此次调查共采集和鉴定出污损生物78种,其中在浸海只有3个月的试板上,主要有柄蔓足类、水螅和藻类,优势种是细板条茗荷、茗荷和直杯螅.至于浸海时间达6～12个月的浮标(包括沉标)及锚链系统,其上还有相当数量的多种双壳类软体动物、无柄蔓足类和苔藓动物等硬性污损生物附着.在种类垂直分布方面,污损生物群落组成随深度发生明显变化.