- 更多网络例句与胚点相关的网络例句 [注：此内容来源于网络，仅供参考]
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It usually enters the ovule through the micropyle, but in some species, such as beech it may enter through the chalaza chalazogamy
花粉管一般通过珠孔进入胚珠，但在某些种中，如山毛榉，它可能是通过合点进入胚珠。
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When ovule orientation is orthotropous the chalaza corresponds to the point where the funicle is attached but in anatropous and campylotropous ovules the chalaza is some distance from the funicle.
当胚珠的方向是直生胚珠时，合点和珠柄连成一条直线，当胚珠是倒生胚珠或弯生胚珠时，合点和珠柄之间有一定的距离。
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There are commonly eight nuclei in the embryo sac: the egg apparatus at the micropylar end, made up of an gee nucleus and two synergid nuclei; three antipodal cells at the oppsite chalazal end that probably aid embryo nourishment; and two polar nuclei in the center that fuse to form the primary endosperm nucleus.
通常胚囊中有8个核，卵器在珠孔端，由卵和两个助细胞组成；3个反足细胞在合点端，可能为胚胎提供营养；胚囊中央有2个极核，融合在一起形成最初的胚乳核。
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Epicotyl The part of the plumule above the cotyledons.
上胚轴：是子叶着生点以上的胚轴部分。
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The results showed that protuberance of fiber cells from TM-1 ovule was first appeared at the funiculus crest, then spread from the chalazal cap to the micropylar, this situation was also observed in mutants with fiber or fuzz, such as Naked seed (N1) and Ligon lintless.
结果表明棉花纤维突变体胚珠纤维分化突起与对照TM-1同样首先发生在胚珠脊突处，然后是合点处及胚珠中部，最后在珠孔端。
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The results are summarized as follows: tin the polygonum embryo sac of tetraploid grape , megaspore telrad arranged in straight line.
结果如下：在四倍体葡萄的蓼型胚囊中，四分体孢子呈直线排列，合点端的大孢子发育胚囊。
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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。
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Three kinds of embryos' chromosome, including goat fertilization embryo, goat-goat cloned embryo and goat-rabbit cloned embryo were analyzed, The results showed that all of them have 60 chromosomes with same character, all were telocentric chromosome, besides the X-chromosome is the second larger telocentric chromosome.
经对超排获得的山羊受精胚、山羊同种克隆胚和羊-兔异种克隆胚的囊胚期胚胎染色体分析表明，三种来源的胚胎其染色体数目均为60条，且所有常染色体均为端部着丝点染色体，X染色体为第二大的端部着丝点染色体，说明山羊同种克隆胚和山羊-兔异种克隆胚均为山羊的核型，是供体细胞核在不同胞质中的重新编程的结果。4。
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As applications, we prove the following results: If / has pointwise pseudo-orbit tracing property, for any k ∈ Z+, and fk is chain transitive, then for any k ∈ Z+, fk has open set transitive ; If f has pointwise pseudo-orbit tracing property, and for any n ∈ Z+,fn is chain transitive, then f has sensitive dependence on initial conditions; If f is open set mixing and has pointwise pseudo-orbit tracing property, then f has property P; Let f :→ be a homeomophism, then f is pointwise pseudo-orbit tracing property if and only if the shift map σf is pointwise pseudo-orbit tracing property.
作为应用，证明如下结论：若f具有逐点伪轨跟踪性质，且对任意k∈Z+，fk为链转换的，那么对任意k∈Z+，fk为开集转换；若f具有逐点伪轨跟踪性质，且对任意n∈Z+，fn为链转换的，则f具有初始敏感依赖性质；若f为开集混合的，且具有逐点伪轨跟踪性质，那么f具有性质P；设f：→是同胚映射，那么f具有逐点伪轨跟踪性质当且仅当移位映射σf具有逐点伪轨跟踪性质。
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Megaspore development and abortion of"Pingyi Tiancha"Compar-ing with regular developing megaspore of normal M.baccata,the megasporemother cellof"Pingyi Tiancha"could form mono-nucleus embryo sacby perhaps irregular meiosis,then most of sexual MES depauperatedand degenerated,finally aborted,or only a few further developed.Of asexualembryo sac,one or more large cells at the chalazal end of nucellus developed in-to one to more asexual embryo sac initials.After the competition between sexu-al embryo sacand asexual embryosac,most ovules only had one asexual embryo sac matured.
平邑甜茶大孢子的发育和败育与正常发育的山定子大孢子对比，平邑甜茶大孢子母细胞经减数分裂能形成单核胚囊，之后多数有性胚囊萎缩、退化而败育，只有极少数进一步发育；而无性胚囊则从胚珠合点端1个或多个较大的珠心细脆形成并首先发育为一个或多个无性胚囊原始体；经过有性胚囊和无性胚囊以及无性胚囊和无性胚囊之间的竞争，多数胚珠只有一个无性胚囊成熟。
- 更多网络解释与胚点相关的网络解释 [注：此内容来源于网络，仅供参考]
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chalaza：合点
珠被、珠心基部与珠柄汇合的部位称为合点(chalaza),是珠柄维管束进入胚囊的位置. 珠柄、珠孔与合点三者排列位置的变化形成了几种常见的胚珠类型,其中以倒生胚珠在被子植物中最为常见. 胚珠类型有时亦可作为分类鉴定的依据.
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epicotyl：上胚轴
胚轴由胚芽(Plumule)、上胚轴(epicotyl)、下胚轴(hypocotyl)、和胚根(radicle)所组成. 下胚轴与胚根的分界点通常不易区别. 子叶附著在下胚轴. 子叶的数目因植物种类而异. 大多数的双子叶植物皆有两片子叶. 裸子植物中除conifer 有较多的子叶之外,
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hypoblast：下胚层
胚胎本身是由两个致密的上皮区域形成的:即羊膜腔底部,称为上皮层(epiblast), 卵黄囊的顶部称下胚层( hypoblast). 这两个区域连合在一起,一个在另一个上面, 就形成了胚盘( blastodisc). 从这点起, 实际上胚胎的产生沿着我们非哺乳动物祖先铺设的路走.
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hypocotyl：下胚轴
胚轴由胚芽(Plumule)、上胚轴(epicotyl)、下胚轴(hypocotyl)、和胚根(radicle)所组成. 下胚轴与胚根的分界点通常不易区别. 子叶附著在下胚轴. 子叶的数目因植物种类而异. 大多数的双子叶植物皆有两片子叶. 裸子植物中除conifer 有较多的子叶之外,
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neutral point：中立点
在轧辊与钢胚接触面间有一点N,其钢胚速度与轧辊圆周速度相等,此点称之为中立点(neutral point)或称为无滑动点(no-slip point). 图中Lp为钢胚与轧辊接触面之长度,α为接触角(angle of contact);依据几何关系,则线材之断面多为圆形,
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anatropous ovule：倒生胚珠
这一现象称为雄性不育 合点:指胚珠基部与珠孔相对的部位,珠被.珠心和珠柄相愈合的部分 直生胚珠(orthotropous ovule):指珠柄.珠心和珠孔的位置列于同一直线上,珠孔在珠柄 相对的一端的一类胚珠 倒生胚珠(anatropous ovule):指珠柄细长,整个胚珠做 180 度扭转,
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orthotropous ovule：直生胚珠
在正常自然条件下,也会产生花药或花粉 不能正常的发育,称为畸形或完全退化的情况,这一现象称为雄性不育 合点:指胚珠基部与珠孔相对的部位,珠被.珠心和珠柄相愈合的部分 直生胚珠(orthotropous ovule):指珠柄.珠心和珠孔的位置列于同一直线上,
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chalazogamy：合点受精
或者直接伸向珠孔,进入胚囊(直生胚珠),或者 经过弯曲,折入胚珠的珠孔口(倒生.横生胚珠),再由珠孔进入胚囊,统称为珠孔受精 合点受精(chalazogamy):花粉管经胚珠基部的合点到达胚囊,
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monocentric chromosome：单着丝点染色体
\\"单核球胚细胞\\",\\"monoblast\\" | \\"单著丝点染色体\\",\\"monocentric chromosome\\" | \\"单头畸胎\\",\\"monocephalus\\"
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porogamy：珠孔受精
花粉管经花柱进入子房后通常沿子房壁或胎座生长,一般从胚珠的珠孔进入胚珠,这种方式称为珠孔受精(porogamy); 少数植物如核桃(Juglans regia)的花粉管是从胚珠的合点部位进入胚囊的, 称合点受精(chalazogamy);