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In second stage,after 2-nucleate embryo sac development,most pollen tubes grow radially around ovules.

在亲和受精过程中,花粉管的生长速度和方向性已成为人们普遍关注的焦点。

This is called fertilisation, and usually takes place in the womans fallopian tube after the matured egg has been released from one of her ovaries.

这就是所谓的受精,通常发生在woman 语输卵管成熟后,鸡蛋已被释放从她的卵巢。

Until now, only within the mouse model, the birth of live young have been reported.

在目前的技术条件下,啮齿类的腔前卵泡已能经体外培养发育至有腔卵泡期,而且从有腔卵泡分离的卵母细胞经体外成熟、体外受精后已能产生新的个体。

Although the megagametophyte formed and even the double fertilization had been finished 70 days after pollination at normal temperature, the megasporogenesis had not yet been finished at low temperature.

低温(12-18℃)处理的蝴蝶兰,授粉50d开始分化胚珠原基、60 d胚囊处于大孢子母细胞时期,比常温(20-25℃)下的推迟10-15 d;授粉70 d,常温下的蝴蝶兰植株已完成雌配子体发育和双受精,而低温处理的蝴蝶兰仍未完成大孢子的发生过程。

Fertilization played an important role in early calcium uptake by fruit. There was no fertilization in parthenocarpy fruit, and calcium concentration was very high during full inflorescence period.

授精作用对果实早期钙营养的吸收具有重要作用,单性结实的果实无受精过程,在花前钙浓度已居很高水平。

The results show:(1) In testis, PNA receptors sites were firstly observed in the cytoplasm and plasma membrane of primary spermatocyte, and greatly increased in the plasma membrane of second spermatocyte, then decreased and were accumulated in the tail of the round spermatid. The same reaction was observed in sperms of testis and spermatheca, which shows stronger reaction in head and weaker in tail. A universal dyeing was observed on the plasma membrane of sertoli cells.

结果表明:(1)在中华蚱蜢的精子发生中,PNA受体是由初级精母细胞合成,然后转移到膜上,在次级精母细胞,由于量的积累其质膜出现了强阳性标记;从早期精子细胞到成熟精子时期糖蛋白的分布发生了明显的修饰变化,这些变化与精子获得与卵子进行识别、粘附、结合等受精能力密切相关:受精囊内与精巢内的精子表面的标记是相同的,说明质膜糖蛋白的修饰作用在精巢内就已完成。

Results: WildAnopheles sinensis in Zhengzhou could develop, survival, suck blood, mate, fertilize and oviposit smoothly in laboratory.

结果:郑州野外的中华按蚊在实验室内交配、受精、吸血、产卵、各期发育、存活均已顺利进行,累代养殖获得成功。

Comparative analyses of sperm structures among the tailed amphibians indicates that: the feature evolution of sperm in urodeles is related to the differentiation of their fertilization modes

此外,与已有报道的有尾两栖类物种精子的结构特征进行分析比较表明:有尾类精子特征的分化与其受精方式的变化是一致的

The structure of both synergids is clear, but the developmental mechanism and the roles during fertilization are not yet understood.

助细胞的形态结构已研究得比较清楚,但有关助细胞的发育机理和它在受精过程中的作用则仍不明确。

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此刻,也许正是在通往天国的路上,我体验着这白色的晕旋。

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