胚胎发育

Embryonic Stem cellscan be derived from the early stage em bryos of mammiferous animals.

从哺乳动物早期发育阶段的胚胎中可以得到胚胎干细胞。

On the 8th and 9th day of pregnance, the mice received one time of general irradiation of 60Co and γray respectively, the dosage of irradiation was 1.0 Gy;on the 10th day ,the mice were put in hotboxes keeping their rectal temperature at 37±0.5℃, 41±0.5℃ and 42±℃0.5℃ persisting for 3,4 and 5 mins, respectively.

目的 探讨高温联合辐射致胚胎神经发育与早期胚胎脑蛋白质和HSPs表达的关系。方法将130只孕鼠按随机抽签分为13组，每组10只。

A corresponding portion of the egg of other animals, consisting of protein and fat which serve as the primary source of nourishment for the early embryo and protoplasmic substances from which the embryo develops.

卵黄其它动物蛋内的相应部分，由蛋白质和脂肪组成，用作早期胚胎的主要营养来源和胚胎由此发育的原生物质

A corresponding portion of the egg of other animals, consisting of protein and fat which serve as the primary source of nourishment for the early embryo and protoplasmic substances from which the embryo develops.

卵黄其它动物蛋内的相应部分，由蛋白质和脂肪组成，用作早期胚胎的主要营养来源和胚胎由此发育的原生物质主要实施生物质气化集中供气系统工程和大型沼气能环工程。

Experiment Ⅴ: Mouse polyploid embryos were produced by electrofusing 2-cell blastomeres successionally.

实验六、通过2-细胞卵裂球交换制作2n／4n嵌合小鼠胚胎，对这种胚胎的发育能力进行了评价。

This experiment object was 1-cell embryo of KUNMING mouse , ROS was added in different developmental phases through basal medium with CZB medium, cultured to morulae, early blastula, blastula and the hatching of blastula, observed the change of cell number and cleavage index of embryo.

本试验以昆明小鼠1-细胞期胚胎为实验对象，以CZB培养液为基础液在不同发育阶段添加外源性ROS，培养至桑椹胚、早期囊胚、囊胚、扩张囊胚阶段，分别观察胚胎的胚细胞数、分裂指数的变化。

Expression of tert and hprt genes were detected simultaneous in all single-copy embryos developed at 4-C (65h-post hCG, 4/4), 8-C (75 h-post hCG, 4/4), morulae (93h-post hCG, 4/4) and blastocyst (118h-post hCG, 4/4) stages and the level of transcription increased.

结果表明，持家基因hprt在成熟卵母细胞受精前后，以及胚胎早期发育过程中均存在转录本。40%卵母细胞中存在的tert mRNA在受精后很快降解，检测不到；胚胎基因组在2-C早期开始转录tert mRNA，转录水平逐渐上升。

Results VEGF-C and VEGFR-3 are all expressed on both mesenchymal cells and vascular endothelium of the embryos during early period. In middle and latter period, VEGFR-3mRNA is mainly expressed on cell plasm of alimentary canal, but it has no expression on vascular and lymphatic endothelium; The expression of VEGFR-3 is extensive and positive expression is seen on the vascular and lymphatic endothelium.

在胚胎中、后期消化道组织中VEGF-C主要表达于消化管壁组织细胞以及肠系膜内，在血管和淋巴管内皮细胞则无表达；VEGFR-3亦表现为广泛的表达，于血管和淋巴管内皮细胞可见阳性表达，并随着胚胎的发育，其在淋巴管内皮细胞的阳性表达率明显增加。

If the foetus is infected at less than 35 days of age, before there has been an opportunity for bone development, death results, followed by complete absorption and ultimately a small litter is born.

如果胚胎在35天之前感染猪细小病毒会发生胚胎死亡，由于此时胎儿的骨骼尚未发育完全，死胎随后将被完全吸收。结果会导致产仔数减少。

The explanation for this must lie in the biochemical maturity of eight-celled embryos compared with their junior, four-cell siblings.

对于这一现象只能解释为，在生化意义上发育至八个细胞的胚胎比只有4个细胞的初级胚胎要成熟。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。