前减数

Before meiosis is completed, however, chromosomes pair with their corresponding chromosomes and exchange bits of genetic material.

减数分裂是前完成，不过，染色体配对及其相应的染色体和交流位的遗传物质。

Maxillary teeth were retracted,and the overjet and overbite were adjusted to right relations,and soft convex tissues face type was improved.

上颌牙齿前突减数矫治，有助于上颌和上牙弓的突度减小，使软硬组织面型之间的形态结构一致，特别对上牙弓突度的改善是肯定而持续的。

At the same time, the existence of respective specific proteins during the development of pistillate and staminate flowers shed some light on the difference of further development direction between these two kinds of flowers.

在减数分裂期前和减数分裂期荔枝的雌雄花的发育都有一个相似的历程，即该时期都有两性花原基，都能正常减数分裂，因而这2个时期都有出现和消失同样的特异蛋白，同时，雌雄花的发育又存在着各自特有的蛋白，从大分子水平上阐明了它们进一步的发育方向的不同。

Before ovulation, primary oocytes complete the first meiosis produce a secondary oocyte and a polar body.

在排卵前，初级卵母细胞完成第1次减数分裂产生次级卵母细胞和第1极体。

Rising of fertilization membrane during induced maturation indicates insemination is not necessary to form the fertilization membrane. The oocyte will not become fertilizable until GVBD has happened and can still be fertilized after the second polar body extrusion.

卵母细胞只有在生发泡破裂之后才具有受精能力，从生发泡破裂到第二极体排出前的整个减数分裂过程中，卵母细胞都可以受精，但是只有在第一极体排出前受精的卵母细胞才能发生卵裂。

The chiasmata observed during the later stages of the meiotic prophase are cytological evidence of earlier cross-over events.

在减数分裂前期末所看到的交叉是在这以前发生了互换事件的细胞学证据。

Methods: Twenty five patients with congenital missing of one or two incisors, 17 patients were treated with extraction, 5 patients were treated orthodontically and prostbodontically. 3 patients were treated with slenderizing to solve crowding and adjust median line and Bolton index.

25例先天缺失下颌个别前牙1～2颗的患者，其中17例采用减数方法进行矫治，5例集中间隙，结合修复进行治疗，3例结合邻面去釉、改变牙轴等手段解除拥挤，采用调整中线和Bolton指数的方法进行矫治。

Methods: The physical volume of 24 bicuspids extracted for orthodontic purposes (16 were imaged with the i-CAT and 8 with the CB MercuRay before extraction) was determined using water displacement technique.

选择10例正畸减数病例拔除的双尖牙24颗，采用排水法物理测量其体积(volume of water， Vw)，其中7例（16颗牙齿）在减数前采用i-CAT进行三维扫描，3例（8颗牙齿）使用CB MercuRay。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。