沙蚕

The growth of oocytes is faster at higher temperatures and longer daylength. There is an effect of low temperature on the gametogentic cycle and synchronous mature of gametes of the sandworm.

野外调查和室内实验结果都表明，种群卵细胞发育的起点温度为5℃；环境水温的低温效应对沙蚕生殖周期和卵母细胞同步性成熟具有深刻影响。

The ecological conditions of parent culture of Perinereis nuntia Savigny were studied.

中文摘要：对多齿围沙蚕亲体的培养条件进行了研究。

The 33 samples of the surface and inner materials of their bodies collected were marine algae,mosses,lichen,sea worm,little red clam,cap shaped shell,fish,penguin and whale.

所研究的海藻、苔藓、地衣、沙蚕、小红蛤、帽贝、鱼、企鹅和鲸等的体表和体内样本计33个。

Ragworms will be familiar to anyone with a childhood interest in sea-shore life.

沙蚕对任何在童年喜爱海滩玩耍的人来说，都不陌生。

It has a long history in toxicological research, especially in nereistoxin pesticide and tetramine.

对毒理学的研究具有久远的历史，尤其是对沙蚕毒素农药和毒鼠强的研究在国内有很大的影响。

Objective Screening ,molecular cloning , and identifying of encoding gene of fibrinolytic activity protein from cDNA library established from clamworm digestive tract epithelial cells by SMART(Switching Mechanism At 5' end of the RNA Transcript) technology .

①目的：构建沙蚕消化道上皮细胞的cDNA文库，并从中筛选、克隆和鉴定一种具有纤溶活性的蛋白编码基因序列。

Methods Trizol reagent from clamworm digestive tract epithelial cells extracted methods Total RNA. The mRNA was purified and reverse transcripted into cDNA. The cDNA was linked into plasmid pDNR-Lib after digested by nucleate endonuclease Sfi I to construct cDNA library.

分离沙蚕消化道上皮细胞，使用Trizol试剂提取总RNA，纯化mRNA，用MMLV逆转录成cDNA，用Sfi I核酸内切酶酶切后连接到pDNR-Lib质粒中，构建cDNA文库。

Sex pheromones of nereidae can recognize gender and change the synchronous function with the cluster.

沙蚕性信息素具有性别辨认和群浮同步性的作用，文中讨论了性信息素的主要成份以及功能。

Zoologists observed centuries ago that a tiny marine worm called Platynereis dumerilii ,a humble protostome thought to be the living species that most closelyresembles Urbilateria , also boasts a central nervous system.

动物学家们发现了在一个世纪以前有一种叫做海生蠕虫-沙蚕小型的还蠕虫，这是一种非常矮小的原肢动物并被认为是存活至今且与 Urbilateria 最相似的物种，而且据说它有着中央神经系统。

Appeared in West Lake after exchanging lake water. The dredging sediment had a negative effect on standing crop of zoobenthos community and dominant species, among which, standing crop of tubificid species declined markedly.

西湖底栖动物的群落结构在生态治理工程后变化较小，换水后有外来种类贻贝和寡鳃齿吻沙蚕出现，群落结构仍然是以富营养化种类为主且缺乏软体动物。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。