Snakes did not acquire their poison for use against man but for use against prey such as rats and mice , and the effects on these of viperine poison is almost immediate 因为蛇有毒液不是用来对付人，而是对付鼠类这样的猎物，毒蛇的毒液对这些猎物会立刻奏效。
Male and female rats and mice were gien four different doses of sodium dichromate dihydrate in their drinking water ranging from 14 . 3 mg / l to 516 mg / l for two years 研究人员在雌雄大鼠和小鼠的饮用水中加入4种不同剂量（ 14 . 3毫克/升至516毫克/升）的重铬酸钠，为期两年。
The estimated reduction of 15 , 000 in animal use following this review equates to around 3 . 5 % of the rats and mice used in testing new human or veterinary medicines or dentistry products 估计根据综述所减少15 , 000只动物等同于大约3 . 5 %小鼠和大鼠被用于测试新药，兽药或治疗牙病的药物等。
Mark mattson , a researcher at the national institute on aging , says that reducing the amount of calories fed to older rats and mice by 30 percent has helped enhance learning and memory 国家老化学会的研究员马克?麦特森说，把给年龄较大的老鼠的食物热量降低30 % ，对提高它们的学习力和记忆力有帮助。
Toxicity testing of new medicines for humans and animals accounts for 4 % of all animal use in europe , which means just under half a million rats and mice are used for this purpose each year 在欧洲，用于新药的人和动物的急性毒性试验的动物占4 % ,这意味着每年有不少于50万小鼠和大鼠被用于急性毒性试验。
A blundering bat once stuck her head into a wakeful weasel ' s bed ; whereat the mistress of the house , a deadly foe of rats and mice was making reday in a trice to eat the stranger as a mouse . " what 一次，一只冒失的蝙蝠不小心闯入一只黄鼠狼的窝里，这只警醒的母黄鼠狼是老鼠的天敌，她正准备把他当成老鼠一口吞下去， “好呀，你胆子还真不小， ”她说道： “我早就受不了你们老鼠偷偷摸摸的行经了，现在，你竟敢溜到我的卧室来？
The aim of this study was to examine ppar5 expression in rat and mouse uterus during early pregnancy , pseudopregnancy , delayed implanation , artificial decidualization and regulation by steroid hormone treatment by in situ hybridization and inununohistochemisny the expression of ppar gene in preimplanation embryo was also determined by rt - pcr 本实验以大鼠和小鼠为材料，利用原位杂交和免疫组化方法检测了ppar基因在早期妊娠子宫中的表达，并利用假孕、延迟着床、人工蜕膜化及激素处理等模型研究ppar基因在子宫中的表达与调节。
As the most common used small experimental animals , rat and mouse have inconsistencys in reproduction , especially in gondonatorpin inducing oocyte maturation . our research was undertook to elucidate which kind of gonadotropins play role in oocyte meiotic maturation , the effects of fsh ans lh / hcg on mouse and rat oocyte maturation in vitro were examined under different culture models 在体外自发成熟模型中，大鼠的去卵丘裸卵( do )自发成熟发生要较卵丘包被的卵母细胞( ceo )早， do培养2h时gvbd可达到88 ，而ceo培养2h的gvbd为53 。
In the first part , we observed the changes of expressions of type i receptor of il - 1 in the rat and mouse brain after intraperitoneally administration of different kinds and doses antigens respectively . in the second part including two experiments we cloned rat il - 6r ' s genes by pcr , expressed them in e . coli dh5 a and cos - 7 cell , and produced il - 6r ' s polyclonal antibody which is proved having more high liter , affinity and specificity 1 第一部分采用不同种类和剂量的抗原刺激，分两个实验，观察了大、小鼠脑内il - 1的i型受体表达的变化，探讨了脑内参与免疫调控的核团和细胞类型；第二部分分两个实验，运用pcr技术克隆了大鼠il - 6r的基因并进行了原核和真核表达，制备了特异性高、亲和力强和较高效价的抗il - 6r多克隆抗体，为进一步进行il - 6r的研究奠定了基础。
