nucellus 中文意思是什麼
nucellus
解釋
n. 名詞 （pl. -celli ） 【植物；植物學】珠心。nucellar adj. 形容詞
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Chalaza ( pl. chalaxae or chalazas ) the region of an angiosperm ovule where the nucellus and integuments merge
合點：被子植物胚珠上的一個區域，在合點處珠心和珠被愈合。 -
Enclosure of the nucellus by the integuments is incomplete, the embryo sac or, in gymnosperms, to the archegonium
珠被並不是將珠心完全封閉，而是留有珠孔以便受精時花粉管進入胚囊，或裸子植物的藏卵器。 -
The nucellus is usually degraded and absorbed as the endosperm develops.
珠心通常在胚乳發育時被分解和吸收。 -
The cells of the integument and nucellus of some plants form perfectly normal embryos.
某些植物的珠被和珠心細胞形成完全正常的胚。 -
In endospermic seeds the endosperm replaces the nucellus and is often a rich source of growth - regulating substances
在有胚乳種子中，胚乳取代珠心，成為生長調節物質（應為營養物質譯者注）的豐富來源。 -
Abstract : 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. it has been proved that the special problem of finishing curved hole is able to be solved
文摘:雙珠式擠壓深孔有效地解決了鋼珠珠心與工件軸心重合的問題，高質高效地實現了較小直徑深孔的擠壓加工，實踐證明，且能實現彎孔的高精加工。 -
Food materials may be stored in a special tissue derived from the nucellus, called the perisperm.
營養物質可以貯藏於由珠心產生的一種特殊組織，叫外胚乳。
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