An embryo at the stage following the blastula, consisting of a hollow, two-layered sac of ectoderm and endoderm surrounding an archenteron that communicates with the exterior through the blastopore.

原腸胚一種囊胚之后的胚胎911国产在线，含有中空久久国产无码专区一区二区、兩層的外胚層和內胚層国产黄色在线视频网站，包圍著通過胚孔跟外界交流的原腸

Only the dorsal lip of the blastopore could induce altered development in the host.

只有胚孔的背唇能夠誘導宿主發(fā)育的改變国产精品第二页。

The fourth milestone was in the embryonic stage of development . Vertebrates and echinoderms began to develop differentiated mouth structures from secondary openings off the blastopore ( an initial opening in the embryonic cavity ).

第四個重要事件出現動物的胚胎發(fā)育期7777网址，脊椎動物和棘皮動物開始在胚孔（即動物早期胚胎原腸的開口）相對的一端另行開口，并最終發(fā)育為成體的口华人黄视频网站。

Fibroblast growth factor from the extraembryonic endoderm (hypoblast, a cell layer unique to amniotes) directs the expression of Wnt planar-cell-polarity pathway components to the intercalation domain.

尤其是黄频网页免费，這項工作顯示了一個原腸胚形成之前的早期插入事件，它可能是回答關于羊膜動物原始條紋是怎樣從遠古胚孔演化而來這樣一個經典問題的關鍵国产熟女AV免费观看尤物。

Toreniafournieri. has a naked embryo sac that protrudes from the micropyle into the cavity between the funiculus and placenta. As embryo sac is mature, the egg cell, the two synergids and about half the central cell are located outside the micropyle.

藍豬耳在其發(fā)育的四核期免费簧网站永久在线播放国产，胚囊從珠孔端伸出，當胚囊完全成熟時自拍偷拍19页，助細胞成h人视频网站、卵細胞和大部分中央細胞均暴露于胚珠組織之外，是研究被子植物受精和胚囊發(fā)育的模式植物av超碰人人操。

DMBQ, ferulic acid and resorcin were effective chemical signal substances in the process of seed germination and haustorium formation of Cistanche deserticola. 4.The embryo is consist of 12 cells, the endosperm cell degraded so as to provide nutrition for the embryo development .As a result, germ tube differentiated from the embryo and came out through micropylar end, the small cell at the tip of the germ tube held the capacity of cleavage and the other cells grew big ,so the germ tube elongated .The anterior extremity of germ tube swelled to form haustorium under chemical substances treatment, the haustorium cell stained ,especially its portrait because of the lignification of the cells.

肉蓯蓉種子的胚是由12個細胞緊密排列形成的圓球狀胚福利影视亚洲影视在线观看，球形原胚分裂增殖的同時，胚乳細胞分解欧美图片另类，為胚細胞的增殖提供營養(yǎng)一级做一级a做片性视频无遮挡，最終胚上分化出的芽管由珠孔端冒出，芽管前端細胞較小国产黄A片免费网站，具有旺盛的分裂能力插女人视频，后部細胞體積增大，芽管逐漸伸長国产午夜精品视频一区二区三区，在化學物質的誘導下人人操两性视，芽管由中部至前端細胞膨大分化出初生吸器欧美精品欧美极品欧美视频，初生吸器呈帽子狀，而這些細胞比其周圍的細胞著色深国产最新黄色网站免费观看，吸器縱向局部區(qū)域的番紅染色加深熟妇激情内激情内射图片，細胞高度木質化。

As the ovule is fully developed, the obturator becomes considerably large and closely covers the micropyle.

隨著胚珠生長国产黄色视频高清在线观看，珠孔塞逐漸增大欧美巨大XXXX做受高清，胚珠成熟時珠孔塞變得相當大并緊密地覆蓋在珠孔上。

Deserticola showed polarity, with the micropyle cells being smaller than the chalazal ends and differentiated into white radicle-like organs.

肉蓯蓉種胚具有明顯的極性尤物网站在线免费看，珠孔端細胞小于合點端国产微拍精品一区91，珠孔端細胞分化、生長并產生白色的類胚根狀結構免费黄色性爱网站。

This distinguishes them from mollusks and arthropods , in which this first opening becomes the animal's mouth .

這一特點將它們與軟體動物和節(jié)肢動物區(qū)分開來国产交换配乱婬视频偷大叼，因為后兩種動物的口都是由胚孔直接發(fā)育而來的。

The results indicated that heartbeat stage of sea perch embryo, tail bud stage of Japanese flounder and turbot embryo were suitable developmental stages for cryopreservation.

三種海水魚類胚胎的毒性耐受力實驗結果表明：無論是用methanol在线观看国产入口视频网站免费下载，還是用PG處理鱸魚不同發(fā)育時期胚胎欧美综合首页，都是心跳期胚胎的成活率最高；牙鲆和大菱鲆尾芽期胚胎在20％的PM32混合抗凍液中成活率分別為87％和78.55％在线视频精品99，分別高于其原腸中期欧美日韩无线码一区二区、胚孔封閉期、心跳期狠起插、出膜前期胚胎的成活率欧美性视频在线。

blastopore：胚孔

當囊胚繼續(xù)發(fā)育時,會向內凹陷形成原腸胚(Gastula),向內凹陷的孔洞則稱為胚孔(Blastopore). 軟體動物即以此種方式發(fā)育,胚孔的地方形成嘴部,此稱為原口(mouth-first)動物. 另一種動物在發(fā)育時胚孔成為肛門,而在另一端發(fā)育成嘴,

blastopore：胚孔,原口

blastopore rest | 胚孔痕 | blastopore | 胚孔, 原口 | blastoporphyritic | 變余斑狀的

blastopore：原口;胚孔

珠芽散布;珠芽繁殖 blastophory; blastochory | 原口;胚孔 blastopore | 溪菜科(綠) Blastosporaceae

blastopore lip：胚孔唇

胚孔 blastopore | 胚孔唇 blastopore lip | 背唇 dorsal lip

blastopore rest：胚孔痕

blastophyllum | 胚層, 胚葉 | blastopore rest | 胚孔痕 | blastopore | 胚孔, 原口

blastopore rest：胚孔痕,原口痕

原腸唇 Blastoporal lip,Lip of blastopore | 胚孔痕,原口痕 Blastopore rest | 發(fā)育迅速 Blastoprolepsis

archiostoma; blastopore：原口;胚孔

\\"原腎\\",\\"archinephros; archnephridium\\" | \\"原口;胚孔\\",\\"archiostoma; blastopore\\" | \\"原腦皮層;舊腦皮\\",\\"archipallium\\"

foramen：孔/小孔/胚孔

forager /強征隊員/搶劫者/ | foramen /孔/小孔/胚孔/ | foraminate /有小孔的/

blastoporal lip：胚孔唇

04.0258 胚孔 blastopore | 04.0259 胚孔唇 blastoporal lip | 04.0260 外包 epiboly

gastropore：胚孔;腹孔

gastropodous 腹足類的 | gastropore 胚孔;腹孔 | gatch 蠟餅