New species of Copidognathinae (Acari: Halacaridae) from southern Africa

Three new species of Copidognathinae (Acari: Halacaridae) are described from the eastern coast of southern Africa (Mozambique; South Africa: Eastern Cape and KwaZulu-Natal). Copidognathus caloglossae sp. nov. and Acarothrix umgenica sp. nov. were collected in mangrove habitats, whereas Copidognathus xaixaiensis sp. nov. was collected on a rocky shore. Acarothrix umgenica represents the first record of the genus Acarothrix Bartsch, 1990 from the African continent.     

MPB和MTB对海水小球藻的抑制作用

研究了哌嗪甲萘醌亚硫酸盐(MPB)和三氨基三嗪甲萘醌亚硫酸盐(MTB)对海水小球藻的抑制作用以及对发光细菌毒性试验分析.结果表明:MPB和MTB对小球藻具有良好的抑制效果而且对环境友好.MPB和MTB在72 h时的半效应质量浓度(EC50)分别为4.28 mg.L-1和6.61 mg.L-1.MPB和MTB对海水小球藻的抑制随着质量浓度和作用时间增加而加强,当达到一定的质量浓度时,MPB和MTB的抑制效果达到饱和.10 mg.L-1以下的MPB和MTB的发光细菌抑光率远远低于30.     

海相化石群落识别的一种方法——以广西六寨泥盆系东岗岭组化石群落的识别为例

化石群落的识别是古代生物群落研究的基础．目前缺少普遍遵循的化石群落识别的原则，识别方法差异很大，这影响了古代群落研究的广度及深度．根据广西六寨泥盆系东岗岭组化石群落的研究实例，所提出的海相化石群落的一种识别方法，为解决识别方法上存在的分歧，提供了一条途径．该方法以注重群落与环境的整体性为原则，在沉积环境确定的基础上，依据化石群总体面貌（化石类型及其相对丰度）与沉积相带类型的对应性，来识别化石群落．     

Luffariellolide,an anti-inflammatory sesterterpene from the marine spongeLuffariella sp.

Summary Luffariellolide (2) is a sesterterpene from the Palauan spongeLuffariella sp. that has useful anti-inflammatory properties. In contrast with the irreversible action of manoalide (1) on phospholipase A₂, luffariellolide (2) is a slightly less potent but partially reversible PLA₂ inhibitor.30 December 1986Acknowledgment We thank Edward Luedtke, Elise Clason and Ellen Snideman for performing some of the assays reported above. The sponge was identified by Dr. Klaus Rützler, Smithsonian Institution, Washington, D.C. The research was supported by grants from Allergan Pharmaceuticals and the California Sea Grant College Program (Projects R/MP-30 and R/MP-31).     

Aragusterol C: A novel halogenated marine steroid from an Okinawan sponge,Xestospongia sp., possessing potent antitumor activity

A novel chlorinated steroid, aragusterol C, was isolated from an Okinawan marine sponge of the genusXestospongia. The compound strongly inhibited the proliferation of KB cells in vitro, and also showed potent in vivo antitumor activity against L1210 cells in mice. The complete structure of aragusterol C was determined by spectroscopic analysis and X-ray crystallographic analysis.     

含相互作用裂纹海洋立管疲劳寿命数值分析

采用ANSYS有限元软件计算含不同尺寸裂纹的海洋立管在内压和波浪力共同作用下的疲劳寿命,分析了海洋立管的疲劳寿命随裂纹几何参数的变化规律.发现对于深度a=5mm长度变化的裂纹,海洋立管的疲劳寿命随着裂纹夹角的增大逐渐减小;当裂纹之间的夹角从10°增加到50°时,疲劳寿命随裂纹长度的增加而减小的程度趋于平缓,即两裂纹之间的夹角对海洋立管疲劳寿命的影响随着裂纹夹角的增大而逐渐减弱.     

The Jurassic system of China—Main characteristics and recent advances in research

In China, the marine Jurassic is mainly distributed in the Qinghai-Tibetan Plateau, southwestern China and environs including southwestern Xinjiang and western Yunnan. Along the western palaeo-Pacific coast, marine Jurassic deposits, which usually intercalate with nonmarine strata, exist sporadically in eastern Heilongjiang, western Fujian, Hongkong, central Guangdong, western Jiangxi, eastern and southwestern Hunan Province, and probably also in western Taiwan. Nonmarine Jurassic strata are widely distributed in the whole of China except for southern Tibet area. They are commonly intercalated with volcanic rocks and contain volcanic materials in eastern China, and in southern Tibet. Marine strata yield various abundant fossils including ammonites, which were widespread in the Tethyan Realm even all over the world. Consequently, China is a critical region to attempt marine and non-marine Jurassic correlation. Through various investigations, both marine and non-marine Jurassic biozonations or assemblages have been established and by this the marine and non-marine Jurassic stratigraphic system and their correlation in China have been clarified.     

试论轮机英语阅读课程语法教学

轮机英语是职业院校轮机工程专业学生的一门必修课程,也是他们通往船员适任证书之路的最大障碍。英语语法基础差乃是学生学习中的一大弱点,而教学任务紧、学生英语基础各异等客观原因使得教师不可能在课堂上系统地讲解语法知识。作者在总结轮机英语语法特点的基础上,指出把握其特点,有针对性地对学生进行语法知识的查漏补缺,能够起到事半功倍的教学效果。     

整体性:基于我国海洋环境管理的视角

我国海洋环境问题与陆地环境问题相比,具有特殊性、多变性、复杂性特点。海洋环境的管理主体具有多元化、主体间关系的复杂化、利益诉求的多样化、管理模式管理手段的碎片化等“非整体性”特征。现实的海洋环境已经遭到破坏,解决的关键是管理主体整体性思维的运用。整体性思维方式要求人们要坚持海陆一体观、整体利益观、管理手段、主体的联动作用等解决问题。