教学课程资源库 更多>>

关键词： 古生物学  

摘要： 本书简要地介绍了古生物学的研究历史、对象、目的、意义和发展趋势,重点在古无脊椎动物与古植物。

关键词： 底栖动物   污染状况   底栖生物   轮虫纲   原生动物   污染水体   水磨河   生物学  

摘要： 水磨河是乌鲁木齐四条水系之一,解放以来,随着工业的发展及城市人口的增加,河水遭到污染并达到十分严重的程度。一九八○年至一九八一年,我们接受自冶区环保局的邀请,对该河的原生动物和底栖动物进行了调查,从生物学角度对该河的污染状况作出一些评价。现将调查结果报告如下.

关键词： 实验动物   生器   微波   电磁波   生物学效应   WB-S-1   断头   大鼠   神经化学  

摘要： 多年来如何迅速中止生物体内的生物化学反应,反映动物死前瞬间活性物质实际含量,一直是神经化学研究中的一个难题。七十年代初,国外应用微波照射动物头部时产生的热效应处死动物的技术,可以迅速灭活脑内酶系统,使脑内的活性物质如乙酰胆碱

关键词： 海洋浮游动物   海洋浮游生物学   海洋浮游生物   昼夜垂直移动   挠足类  

摘要： 昼夜垂直移动(简称垂直移动)是海洋浮游动物界(从原生动物至被囊动物)的常见现象,而这个现象在浮游甲壳动物中尤为普遍。通过在世界各海(特别是欧美近岸海区)的多年观察,对垂直移动的类型、幅度、速度以及与外界环境的关系有了不同程度的了

摘要： Several species of serolid isopod from Signy Island, South Orkney Islands and also from South Georgia were studied, and aspects of their reproductive behaviour and associated morphology are discussed. InSerolis polita Pfeffer egg-laying took place at a mean age of 28 months, and the eggs were then incubated in a ventral marsupium for a period of 20 months before the release of juveniles in the spring. The mean egg dry weight at spawning was 0.68 mg forS. polita and 3.35 mg forSerolis cornuta Studer. The egg weight increased during marsupial development due to the uptake of minerals, but the total calorific content fell. Within each species brood size was linearly related to female size and the mean number of eggs varied from 40 forS. polita to 232 forSerolis pagenstecheri Pfeffer. There was no detectable marsupial mortality.S. polita appeared to breed repeatedly at two-year intervals, butS. cornuta probably only breeds once. The reproductive biology of Antarctic serolids is compared with that of temperate isopods, and it is shown that they produce larger young which is related to their larger adult size. The extremely protracted period of marsupial incubation is associated with the need to synchronize reproduction with the seasonal nature of Antarctic primary production.

摘要： The nest construction and architecture, and the prey collection and storage behavior of O. dilectus Saussure, a ground-nesting eumenid wasp of North America that exclusively utilizes weevil larvae of the genus Hypera as prey, are described. This species may have potential as a biological control agent of alfalfa and clover weevils in the genus Hypera because of its rapid collection of wevil larvae, its gregarious nesting habit, and the apparent ease with which individuals can be transplanted. Other European congeners have many similar characteristics. The potential for adverse interactions between O. dilectus and Bathyplectes curculionis (Thomson), a parasite of Hypera, is discussed.

摘要： I. nikolskii, a myxosporean originating from the Far East, reached Hungary through natural waters from neighboring countries which had imported the Amur wild carp. T. nikolskii is a specific parasite of carp which produces large cysts on the fins of fry. The cysts usually appear on the fish at the beginning of July;in Aug. and Sept. cysts containing the mature spores burst. The cysts are easily seen, even by the naked eye, and are surrounded by a thick capsule composed of connective tissue strengthened by cartilaginous elements. Because of the breaking down of the fins, the parasite has pathological significance in fry.

关键词： 动物饲养   菌数   SPF   微生物学   清洁度  

摘要： 目的:在国立公害研究所动物实验设施中,作为SPF动物饲养环境中微生物学清洁度的标准,是对空中落下菌,饮水和饲养动物等进行定期检查。这次对空中落下菌的检查结果,就其测定位置进行探讨。

关键词： 灵长类动物   神经活动   中国科学院   生物学   美国耶鲁大学   重要研究对象   苏呼米   传染病  

摘要： 灵长类动物由于在形态、繁殖、行为、神经活动和传染病等方面与人极为接近,因而关系密切是生物学和医学的重要研究对象。一九二五年美国耶鲁大学开始饲养实验猴群,一九二七年在苏联格鲁吉亚共和国的苏呼米创立了世界上有名的灵长类研究中心.

关键词： 甲骨文   殷商时期   殷人   说文   尔雅   殷墟文字   动物学   生物学  

摘要： 人类自从进入历史,就必须不断地猎食虫鱼鸟兽,与自然界中的动物有广泛的接触.由于这种接触,人类在漫长的岁月里逐渐累积起许多有关动物的知识,人类的动物学也就在其中孕育而萌芽.可惜,远古缺乏有效的记载工具,因此有许多知识,都无形地消失了.