卵囊

There are commonly eight nuclei in the embryo sac: the egg apparatus at the micropylar end, made up of an gee nucleus and two synergid nuclei; three antipodal cells at the oppsite chalazal end that probably aid embryo nourishment; and two polar nuclei in the center that fuse to form the primary endosperm nucleus.

通常胚囊中有8个核，卵器在珠孔端，由卵和两个助细胞组成；3个反足细胞在合点端，可能为胚胎提供营养；胚囊中央有2个极核，融合在一起形成最初的胚乳核。

Using the Hprt gene as a positive control, our result suggested that both the testis tissue and the male embryos from which Sry transcription can be detected failed to yield any positive results of Xist. Female embryos at the pronucleus stage and 2-cell failed to produce any positive result of Sry and Xist too.

然后利用实验一确定的PCR条件，以Hprt为阳性对照，用巢式RT-PCR对小鼠早期胚胎进行Xist基因的转录分析，结果发现，转录Sry基因的睾丸组织以及雄性胚胎，从受精卵发育到囊胚的过程中，基本上不转录Xist基因；不转录Sry基因的雌性卵母细胞和雌性胚胎，从出现原核开始，到发育至2-细胞期的过程中，Xist基因一直不转录，但是，从4-细胞期开始，一直到孵化前囊胚阶段，雌性胚胎都转录Xist基因。

Sepals ovate or oblong, suberect, base of lateral pair not saccate or subsaccate.

或长圆形，近直立的萼片卵形，侧对并非囊状的或近囊状的基部。

Yolk-sac larva A fish larvae which has already hatched from the egg but has not started feeding yet and still absorbs the yolk in the ventrally attached sac.

卵黄期幼生鱼幼体的发育阶段特徵，描述在消化道区域腹部有一个卵黄囊。鱼幼体已经从卵孵化，但是仍然没有开始觅食而继续吸收在腹附著的卵黄囊。

Three types of cells were transferred into perivitelline space under zona pellucida of rabbit oocytes respectively.

用体外培养14代和24代的小鼠胚胎干细胞构建的异种重构卵的卵裂率分别是88.5％和82.1％(P＞0.05)，囊胚发育率分别是16.7％和15.4％(P＞0.05)。

Polycystic ovary syndrome , one of the most common endocrine diseases affecting women of reproductive age, plays an important role in anovulatory infertility, with a prevalence of up to 5%~21%; The main clinical manifestations include irregular menstruation (amenorrhea or infrequent menstruation or dysfunctional uterine bleeding), infertility, hirsutism, obesity and acanthosis nigricans. Elevated serum LH levels and hyperandrogenism, insulin resistance with compensatory hyperinsulinemia are its endocrinological features. Polycystic ovary morphology is also a common feature in PCOS. With the advance researches, PCOS displays its complexity and essential trend.

多囊卵巢综合征(polycystic ovary syndrome，简称PCOS)是育龄期妇女最常见的内分泌紊乱性疾病之一，在不排卵性不孕中占主要地位，发病率约5%～21%；主要表现为月经异常、不孕、多毛、肥胖及黑棘皮征，以高雄激素血症、促性腺激素异常、高胰岛素血症及胰岛素抵抗等内分泌学特征，以双侧卵巢增大呈囊性改变并间质增生为病理形态学基础的多系统疾病。

In the"poly-egg apparatus embryo sac",three egg-apparatuses are the majority which canbe further divided into three subtypes,namely,"5-2-1"type,"6-2-0"type and"5-3-0"type,based on the position of antipodal cell.

三卵卵器结构胚囊&依反足细胞的位置又可分出&5-2-1&型、&6-2-0&型和&5-3-0&型等三种亚类型。&

The myelinization of cerebellar white matter,middle cerebellar peduncles,anterior limb of internal capsule,splenium and genu of corpus callosum,centrum semiovale,the white matter in parietal-occipital area and frontal-temporal area were documented at birth to 5,2～4,3～7,3～5,4～7,2～7,3～9 and 4～12 months old,respectively.

髓鞘形成至成熟时间：小脑上下脚、桥脑背侧、丘脑腹外侧和内囊后肢后部出生时已成熟，小脑自出生至5个月，小脑中脚2～4个月，内囊前肢3～7个月，胼胝体后部、膝部分别是3～5个月、4～7个月，半卵圆中心2～7个月，枕顶叶白质3～9个月，额颞叶白质4～12个月。

Two pathways may belong to the same functional system, though they have some architectural difference. It has been disscussed that some neural structures in the visceral afferent pathway may have some relation to the somesthetic afferent.

在梭形细胞的树突上见到较多的对称性突触，突触前末梢含有多形性囊泡；在卵圆形细胞的远核区和树突上，常见到含圆形囊泡的末梢，与胞体和树突形成不对称性突触。

METHODS: Constructing the CAM model by exposing CAM on the shell subpoint between 2 vitelline veins and generating an air chamber after 5 days of incubated with aseptic incubator at 37℃.

将鸡胚消毒后，置于37℃无菌恒温箱中孵育5 d，在距胚头1 cm两条卵黄静脉之间的卵壳投影部位磨切暴露尿囊膜，制成假气室，用无菌滤纸封闭窗口，制成鸡胚尿囊膜模型，备用。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。