胚孔

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.

原肠胚一种囊胚之后的胚胎，含有中空、两层的外胚层和内胚层，包围着通过胚孔跟外界交流的原肠

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

只有胚孔的背唇能够诱导宿主发育的改变。

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 ).

第四个重要事件出现动物的胚胎发育期，脊椎动物和棘皮动物开始在胚孔（即动物早期胚胎原肠的开口）相对的一端另行开口，并最终发育为成体的口。

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，这项工作显示了一个原肠胚形成之前的早期插入事件，它可能是回答关于羊膜动物原始条纹是怎样从远古胚孔演化而来这样一个经典问题的关键。

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.

蓝猪耳在其发育的四核期，胚囊从珠孔端伸出，当胚囊完全成熟时，助细胞、卵细胞和大部分中央细胞均暴露于胚珠组织之外，是研究被子植物受精和胚囊发育的模式植物。

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.

肉苁蓉种子的胚是由12个细胞紧密排列形成的圆球状胚，球形原胚分裂增殖的同时，胚乳细胞分解，为胚细胞的增殖提供营养，最终胚上分化出的芽管由珠孔端冒出，芽管前端细胞较小，具有旺盛的分裂能力，后部细胞体积增大，芽管逐渐伸长，在化学物质的诱导下，芽管由中部至前端细胞膨大分化出初生吸器，初生吸器呈帽子状，而这些细胞比其周围的细胞着色深，吸器纵向局部区域的番红染色加深，细胞高度木质化。

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

随着胚珠生长，珠孔塞逐渐增大，胚珠成熟时珠孔塞变得相当大并紧密地覆盖在珠孔上。

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

肉苁蓉种胚具有明显的极性，珠孔端细胞小于合点端，珠孔端细胞分化、生长并产生白色的类胚根状结构。

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

这一特点将它们与软体动物和节肢动物区分开来，因为后两种动物的口都是由胚孔直接发育而来的。

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.

三种海水鱼类胚胎的毒性耐受力实验结果表明：无论是用methanol，还是用PG处理鲈鱼不同发育时期胚胎，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混合抗冻液中成活率分别为87％和78.55％，分别高于其原肠中期、胚孔封闭期、心跳期、出膜前期胚胎的成活率。

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。