During organogenesis such as formation of nervous system , angiogenesis , etc the cell mechanisms involved are similar to those of carcinogens , such as cell proliferation , differentiation , migration , etc . and there is no shortage of embryos 利用斑马鱼生物特性体外受精胚胎透明发育期短，可做为经济且快速的药物组织特异性筛选系统。
Cries of " oh , oh ! " were already rising in the pit and the cheap places . there was a sound of whistling , too , when a voice in the stalls , suggestive of a molting cockerel , cried out with great conviction 后座和廉价座里发出“哟，哟”的叫声，还有人吹起口哨，这时候，前座里响起了一个少年发育期变嗓的声音，一本正经地嚷道： “太棒了！ ”
Three of the 15 who did not bank their sperm were too sick to do so , while one patient had not reached puberty . the remaining men who were unable to obtain a sperm sample were younger than the men who succeeded in doing so 15 . 3 years vs . 17 . 8 years 在未能如愿的15人中，有3人是因为对此举持十分反感的态度而最终没有将其付诸行动，还有1人则是因为自己尚未进入青春发育期。
The author points out : chinese flowering quince flowers first , then unfolds its leaves ; the inflorescence is a cyme ; bearing branch is a specialized dwarf and cluster twig ; the development can be divided into two phases young fruit development and later fruit growth 先开花后展叶，花序为聚伞花序，花果枝为特化的短缩叶丛枝，梨果发育分两个时期：幼果发育期和果实生长期。
One corresponded to the period of c6 in which there were some preparations for forming embryonic calli , the other corresponded to the embryogenetic stage . in the conversion of embryonic calli , the lowest threshold value of total protein content in embryonic calli was 11 . 5 + 0 . 5 ug / mg fw 它们分别对应于体细胞胚发生过程中胚性愈伤形成的准备期( c _ 6期)和胚状体发育期( e _ 1 e _ 5 )两个关键时期。
For the male a - dults , the somatotypes were similar mongolian , canadian and american ( northeast and midwest ) ; while for the female adults , the somatotypes were similar to mongolian , oroqen , ewenki and daur . the economy influences somatotype , mainly endomorph 经济及营养因素影响体型，特别是影响影响生长发育期青少年的体型；就体型三因子而言，主要影响内因子，对中、外因子影响较小。
Comparing with air - conditioning , tv and other household appliances mature market environment , china ' s audio industry ' s overall development situation is : overall size , disorderly market competition , the market is still in the developmental stages , great market potential 相对于空调、彩电等其他家用电器成熟的市场环境，我国的音响行业的总体发展状况却是：整体规模不大、市场无序竞争、市场还处于发育期、市场潜力大。
Natural enemies of hyphantria cunea ( drury ) were investigated in qinhuangdao , hebei province . two parasitoids in larva stage , 12 parasitoids in pupal stage and 2 predators ( coccinella septempunctata and tenodera sinensis ) were found 摘要通过对美国白蛾各个发育期的天敌进行调查与研究，发现除了捕食性天敌七星瓢虫、大刀螳螂等外，幼虫期有2种寄生性天敌、蛹期有12种寄生性天敌，这为保护和利用天敌、有效控制美国白蛾提供了依据。
Finally digestive enzyme activities in hepatopancreas of e . sinensis fed on experiment diets with different protein level during juvenile and ovarian maturation . the purpose is to accumulate basal information for reproductive nutrition , and provide reference for breeding broodstock in seed production and formulation of broodstock diet 此外，还研究了蛋白质营养对中华绒鳌蟹卵巢发育期和仔蟹生长期消化酶的影响，以期为中华绒鳌蟹的生殖营养生理研究积累基础资料，同时也为人工育苗生产过程中的规范亲体培育及全价配合饲料的研制提供理论依据。
Changes in concentrations of boron ( b ) and magnesium ( mg ) in the ovary ( fruitlet ) , rind and pulp of fruit were investigated throughout fruit development of parthenocarpic kamei satsuma mandarin ( citrus unshiu marc . ) and self - pollinated egan 1 tangerine ( c . reticulata blanco ) . the results showed as follows : 1 ) b concentrations in the ovary of kamei were at high levels before flowering and at full bloom , and decreased after flowering , whereas that of egan 1 was relatively low at full bloom , thereafter significantly increased . no significant differences were observed in mg changes in the ovary ( fruitlet ) between the two cultivars , which presented decreasing trends after flowering . 2 ) minor changes of b concentrations in the rind of the two cultivars were detected , remarkable changes were found for b in the pulp , which came to the peak values during the stage of fruit enlargement . mg concentrations were relatively high in the rind and pulp of the two cultivars during early fruit development , and presented obviously declining trends during the middle and late stage of fruit development 以单性结实的龟井温州蜜柑和自花授粉结实的鄂柑1号橘为试材,对整个果实发育期的子房(幼果) 、果皮和果肉的硼镁含量变化进行了测定.结果表明: 1 )龟井花前至花期子房硼含量就已较高,花后下降;而鄂柑1号花期子房硼含量相对较低,花后有一显著上升;两品种子房(幼果)镁含量变化无明显差异,花后均趋下降. 2 )两品种果皮硼含量变幅较小,而果肉硼含量变幅相对较大,且均在果实膨大期出现明显的上升高峰;两品种果皮和果肉镁含量在果实发育前期均相对较高,在果实发育的中后期则趋明显下降
