在胚胎阶段

He remarks that some rudimentary organs, such as teeth in baleen whales, are found only in embryonic stages.

他说，一些痕迹器官只在胚胎阶段能被发现。

①The development of goat embryonic epidermis, which differentiates exquisitely during the embryo phase, is priority to that of corium.

①山羊胚胎表皮的发生优先于真皮的发生，在胚胎时期处于剧烈的分化阶段。

Because current federal law already forbids the use of federal funds to create embryos (the earliest stage of human offspring ago birth) for research or to 清楚ingly endanger an embryo's life, NBAC will remain silent on embryo research.

因该现今的联邦国家律法已经禁止应用联邦基金克隆胚胎(人类后裔在出生前的最早阶段)用于研究或者有意地威胁胚胎的生命，NBAC在胚胎研究上将保持沉默。

Because current federal law aleasysty tobids the use of federal funds to create embryos (the earliest stage of people offsummer ago birth) to research or to 清楚ingly endanger an embryo's life, NBAC be to remain silent on embryo research.

因该现今的联邦国家律法已经禁止实际运用联邦基金克隆胚胎(人类后裔在出生前的最早阶段)用于研究或者有意地威胁胚胎的生命，NBAC在胚胎研究上将保持沉默。

Among the 20 samples of IGF- 1 group, a 8-cell stage embryo, a morula and two blastula were found as positive by the red colour appearance .

IGF上的表达 2～8细胞胚胎 18个，桑堪胚 1个，囊胚 2个，共计 ZI个胚胎用于＊F2 检测，阳性表达14个，其中强阳性表达7个，弱阳性表达7个，分布于各阶段胚胎，在胚胎细胞中呈现深、浅程度不同的橘红色染色。l级和 2级胚胎 IGFZmRNA的阳性表达差异有显著性。

The whole embryonic developmental course results from the ordinal expression of a large number of genes according time and space. Many developmental mechanisms have been determined in the embryonic stage. Therefore, study on the regulative mechanism of embryonic development is important for elucidate principles of biologic growth, development and evolution.

整个发育过程都是大量的基因按照一定的时间、空间和次序表达的结果，其中许多调控机制在胚胎发育阶段就已经决定，因此，研究胚胎发育调控机制对于阐明生物的生长、发育和起源进化具有重要意义。

Using GSA-〓 lectin histochemistry, the first appearance of microglia occurred at E13, usually stained as scattered amoeboid cells. From then on, the number of microglia increased steadily, reached a peak at postnatal day 7 (P7), and then reduced gradually to adult level. Generally the morphological form of microglia undergoes transformation from early rounded or ameboid to adult resting ramified as they differentiate during development.

使用凝集素GSA-〓亲和组织化学染色，本实验最早观察到小胶质细胞在胚胎13天（E13），为散在分布的圆形或阿米巴样细胞，随后细胞数量逐渐增多；总体而言小胶质细胞的形态遵循着由圆形或阿米巴样逐渐转向纤细分枝状的演变规律，不同阶段细胞形态各有其特点，在不同区域也存在差异；小胶质细胞的数量在生后第七天（P7）达到高峰，其后开始逐步降低直至成年。

Conclu sion:(1)Surface densities of PCNApositive cells reached their peaks on 14th day after birth,but the number of apoptotic cells reached its peaks on 21st day p ostnatal,so the apoptotic peak was late the proliferating peak for a week,and related to the particular period in cycle of seminiferous epithelium;(2)The spe rmatogium were found move from center to the periphery of the seminiferous tubule and arrange disorder to order;(3)The spermatogonium remained replicating activ ity of DNA during the developing stage.

生精细胞凋亡的高峰要滞后其增殖峰1周左右，而且与其所处生精周期的特定阶段有关；（2）精原细胞在胚胎发育过程中向曲细精管周边迁移，其排列由无序到有序；（3）在生后各发育阶段中，精原细胞始终保持DNA复制的能力。

Thus gp130 is the common signal transduction molecule. Gp130 molecule expresses universally on many tissues including immune system, hemapoietic system, and nerve system. Gp130 has an essential role in the function and regulation of the above systems, especially in the development of hemapoietic system. The signal transduced by gp130 is necessary during the differentiation and proliferation of hemapoietic cells. It is evidenced that the embryo of gp130 gene-knockout mouse was dead due to a serious impediment of the development of hemapoietic system.

Gp130在人体组织细胞上广泛性表达，介导和调节机体的免疫、造血以及神经系统的生理功能，尤其是在造血系统的发育过程中，具有极其重要的作用，动物实验表明，敲除小鼠的gp130分子基因可以使其在胚胎的早期阶段产生严重的造血系统障碍，最终导致流产，由此表明在造血细胞的分化、发育和生物学行为中，gp130介导的信号是必不可少的。

In early development stage, muscarinic agonist carbachol significantly decreased the magnitude of the pacemaker current If but had no effect in late development stage.

我们发现，在胚胎发育的早期阶段，M胆碱能受体激动剂(muscarinic agonist carbachol，CCh)明显抑制If，但在胚胎发育的晚期阶段，CCh对If的抑制作用消失。

Objective: To study the effect of polycythemia on blood oxygen saturation.

裴蕾目的：观察RBC剧增而引起的高粘血症对血氧饱和度的影响。

Based on SIMPLER algorithm in the curvilinear body-fitted coordinates, the calculations were performed for Pr=0.7, Re=10~1000 on non-orthogonal non-staggered grids which are generated by elliptic equation systems.

采用曲线坐标系下压力与速度耦合的SIMPLER算法，数值研究了周期性渐扩渐缩波纹通道内脉动流动与换热情况，流动Re数的范围为10~1000，Pr数为0.7。