查询词典 pollen

In the present review, we focus on some of the recent advances and some key developmental events revealed in the fertilization process, including the role of the egg apparatus in guiding pollen tube orientation, sperm cell movement to their targeting cells, interaction between gametes, egg cell activation, and onset of embryogenesis and endosperm development.

本文着重讨论受精作用的若干重要发育事件，包括受精前卵器细胞对花粉管向胚珠定向生长的近距离引导信号，精子的靶向运动，精、卵细胞相互作用和配子融合后卵细胞的激活与中央细胞发育的启动等。

Creation by the union of sperm or pollen with an animal or plant or egg cell .

花粉和植物或精子与卵子相结合的行为或过程。

Using electrostatic precipitation, the ESP Air Purifier traps airborne pollutants*—such as pollen, dust mites, smoke and pet dander—improving the quality of the air in your personal space.

ESP Personal Air Purifier 通过静电沉淀原理吸取空气中的污染物质，比如花粉，灰尘，烟尘和宠物皮屑等等，从而达到改进您私人空间空气质量的效果。

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。

The pollen and embryo sac fertility were controlled by two sets of different genes, and both of them made contributions to F〓 spikelet fertility.

花粉育性和胚囊育性分别出不同的遗传基因控制，两者共同决定小穗育性的高低。

The embryoid rate is highest when the sucrose concentration is 13% in anther and pollen culture.

在两种培养方式中，培养基中的蔗糖浓度均以13％的培养效果最好。

Thirteen cultivars of spring and summer Chinese cabbage were used in study on influenle of some factors on Pollen embryoid indcction.

以13份春、夏大白菜为材料进行花药培养，研究几种因素对花药胚状体诱导的影响。

Napus showed normal meiotic behavior,high portion of germinated pollen and normal embryological development.

为了和现有的甘蓝型油菜进行区分，得到的新材料被认定为甘蓝型油菜新材料。

Seeds 0.3-0.6 mm, free, not embedded in endocarp; pollen in tetrads

种子0.3-0.6毫米，离生，不嵌入在内果皮里；在四分体里的花粉 8

More calcium precipitates were located in the epidermis, endothecium and tapetum of the sterile anther than in those of the fertile anther. Longitudinal inner cell wall of the sterile anther became thicker than that of the fertile anther at the dyad stage and uninucleate pollen stage.

到四分体与单细胞花粉时期，不育花药的木质部细胞的次生加厚壁上有较多的Ca2+沉淀，连接组织中的Ca2+沉淀也大大增加，所有不育花粉外壁较厚而发育都不正常。

This paper designs the communication system of radio telescope FAST.

针对500m口径球面射电望远镜FAST分布式控制系统的特点完成了其通信系统的设计。

Political sheep's step-by-step a large number of fossils unearthed in the county soil Ma Ali after rural village in the middle of sallow pelitic siltstone.

步氏和政羊化石大量出土于广河县阿力麻土乡后山村，产于灰黄色泥质粉砂岩中。