开始发育

Lastly, evolutionary biology studies the origins and development of the human nervous system and, in as much as this is the basis of the mind, also describes the ontogenetic and phylogenetic development of mental phenomena beginning from their most primitive stages.

最后，进化生物学研究人类神经系统的起源和发展，由于这是心灵的基础。也描述精神现象从它最原始阶段开始的个体发育和系统发育。

Pollen morphology of the Chinese monotypic genus Dichotomanthes and its out-group Prinsepia utilis were investigated from the point of view of pollen development. The SEM observation revealed that there is not any change in morphology and sculpture of pollen grains from the young pollen grain seperated from callose of tetraspore to the mature pollen grain in Dichotomanthes tristaniaecarpa. Only the volume of pollen grain increased with maturity.

从发育的角度研究了中国特有单种属Dichotomanthes Kurz及与其系统学研究有关的外类群Prinsepia utilis的花粉形态，扫描电镜观察显示Dichotomanthes花粉粒自脱离四分体胼胝质膜开始至成熟二核花粉粒不同发育时期，花粉形态和外壁纹饰未见变化，仅花粉体积随成熟度增加而有所增大。

The results show that the normal process begins with archesporial cell and undergoes stages of primary and secondary sporogenous cell,microspore mother cell,dyad,tetrad,central nucleus microspore,vacuolated microspore,mature microspore,twocell pollen and threecell mature pollen.

对平流层辐射处理SP3谷子和对照CK3谷子雄性细胞发育的研究表明，雄性细胞正常发育过程从孢原细胞开始，经初生造孢细胞、次生造孢细胞、小孢子母细胞、二分体、四分体和单核小孢子中央期、单核小孢子液泡期、单核小孢子成熟期直到二细胞花粉、三细胞成熟花粉结束。

The development of Peiai 64S and IR36 did not differ up to microsporocyte formation stage; but since meiosis stage, male reproductive cells of Peiai 64S underwent several structural changes and ultimately terminated by early bicellular stage.

结果表明，小孢子母细胞减数分裂之前，培矮64S与IR36的发育过程基本相似。但从减数分裂开始，培矮64S的雄性性细胞出现一些异常变化，并最终发育至二胞花粉早期败育。

Several studies suggest that the measurement of mullerian inhibiting substance in serum may be used to early detect persistent or recurrent disease in patients with ovarian sex-cord tumors.

性胎儿因在胚胎期产生抗缪氏荷尔蒙，故能发育出性内生殖器，但到青春时，巢囊泡的颗细胞开始产生少抗缪氏荷尔蒙，相信有调节泡的发育的功能。

The pulsative index and resistance index of the ovarian and uterine arteries blood flow and endometrial pattern and thickness were measured by transvaginal color Doppler imaging on the day ofHCG administration.

国内这方面的报导尚非常少见。我们于2002年11月至2003年11月对来院行常规IVF-ET助孕术的174例不孕患者，于治疗周期的第8天开始应用TV-CDS测定卵巢动脉和子宫动脉的血流图，以监测卵泡发育及子宫内膜发育。

Under low temperature condition, fertility restoring, anther developing normally, the tetrads formed after archesporical cell, sporogenous cells and microspore mother cell. Subsequently, microspores were free from the tetrad of fertile anther and formed mature pollen grains, tapetumof the fertile anthers began to disintegrate and disappear at last.

在低温处理条件下，育性恢复，花药发育正常，经过孢原细胞期、造孢细胞期、花粉母细胞期后，可以顺利形成四分体，可育花药的四分体可以释放出小孢子并发育为成熟的花粉粒，同时绒毡层细胞开始解体，最后消失。

In this test, Xenopus laevis tadpoles were exposed to Aroclor1254 at gradient concentration(0,10,25,50,50 μg/L) from stage 52 to metamorphosis completion.

将非洲爪蟾蝌蚪从发育的第52期开始暴露在不同浓度(0、10、25、50、100μg/L)的多氯联苯(Aroclor1254)中，直到变态结束，研究其对非洲爪蟾变态发育的影响。

The third-stage larvae were developed to fourth-stage larvae (the most optimal develop rate was 41%) when cultured in defined complete medium, further, cultured in defined incomplete medium, was examined no develop and a poorly survival rate. When the third-stage larvae were cultured in the defined complete medium under 37℃ and 5% CO2 in air, the larvae were began to develop to the fourth-stage larvae in cultured for 30 days, being enclosed within the sheaths of the third molts of life cycle.

广东住血线虫的第三期幼虫以MEM medium添加胺基酸、脂肪酸及碳水化合物的培养基在37℃含有5％ CO2的无菌培养箱中，培养至第21天已发育至第三期幼虫中期的阶段，第24天已发育至第三期幼虫末期的阶段，第30天开始出现带鞘的第四期幼虫，第36天则观察到虫体明显变长并蜕去外鞘及第三期幼虫特有的眼点消失的第四期幼虫。

The development of horizontal growth of the parasitized host was quickened, and the same time, C. deserticola began to differentiate and develop.

被寄生后的奇主根横向发育加快，同时肉苁蓉植物体开始分化和发育。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。