珠心

The central portion of an ovule in which the embryo sac develops ;the megasporangium.

珠心胚珠的中心，胚芽囊在此发育；大孢子囊

A minute structure in seed plants,containing the embryo sac and surrounded by the nucellus,that develops into a seed after fertilization .

胚珠种子植物的一个小的结构，含有胚囊并被珠心所包围，施肥后长成种子受精的产物是杂合子。

A pollen tube growing through the micropyle and interspace of the nucellus epidermis releases two sperms into one synergid.

花粉管经珠孔及珠心表皮细胞间隙进入一个助细胞，释放精子。

The pollen grains of yew tree are directly fallen on the micropyle by wind and enter pollen chamber at the top of nucellus through pollination drops, a sugary exudation rich in nutritious materials at the micropyle.

红豆杉的花粉，一般借助风力直接传播到珠孔端的传粉滴上。传粉滴是珠心组织的周期性分泌产物，它富含糖和氨基酸等营养物质。

A minute structure in seed plants, containing the embryo sac and surrounded by the nucellus, that develops into a seed after fertilization.

胚珠种子植物的一个小的结构，含有胚囊并被珠心所包围，施肥后长成种子

Double steel-ball extrusion deep hole solves the matching problem of steel-ball nucellus with workpiece axis, using this technology, extruding deep hole with smaudiameter is attained efficiently with high quality .

文摘：双珠式挤压深孔有效地解决了钢珠珠心与工件轴心重合的问题，高质高效地实现了较小直径深孔的挤压加工，实践证明，且能实现弯孔的高精加工。

The influences of INA on ovule ultrastructure were also researched. The plasmolysis phenomenon occurred in the nucellar cells, a great deal of bubble structures existed in the cytoplasm, the sterility of plastosome was disarranged or the structure was entirely damaged and turned transparent.

INA细菌对胚珠的超微结构的影响表现为：使珠心细胞发生质壁分离现象，细胞质中存在大量泡状结构，线粒体的嵴紊乱或结构完全被破坏，呈透明状。

DC have been studied by using the cytochemical methods. The results showed that the cytoplasm of the haustorial cells, the degenerating sites of integumentary cells and nucellar cells surrounding haustorial cells showed strong PAS staining.

DC的胚乳吸器进行了细胞化学研究，结果显示，胚乳吸器的细胞质、胚乳吸器周围解体的珠心细胞和珠被细胞均呈强PAS正反应。

Lots of starch grains in nucellar cells and integumentary cells surrounding endosperm haustoria decreased and disappeared with the development of endosperm haustoria.

随着胚乳吸器的发育，吸器附近的珠心细胞和珠被细胞中贮存的大量淀粉粒逐渐减少和消失。

And the biochemical, cytochemical and ultrastructural changes in the nucellar cells in relation to the pollen chamber formation were studied.

胚珠贮粉室的发育过程，进行了扫描电子显微镜的观察，并对其间相关珠心细胞的生物化学、细胞化学和超微结构变化作了研究。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。