The neural stem cells can be isolated from human embryonic cerebral tissue . The ratio of cell clone formation from smaller gestational age is higher than that from elder gestational age .The differentiation of neural stem cells from hindbrain is easier than that from forebrain.

從人胚腦組織的前亚洲啪啪天堂色欲网、后腦中分離出神經(jīng)干細(xì)胞亚洲欧洲中文字幕视频在线观看；較小胚齡的腦組織原代培養(yǎng)時(shí)細(xì)胞克隆的形成比例較高aigao在线；后腦組織分離的南京醫(yī)科大學(xué)碩士學(xué)位論文神經(jīng)干細(xì)胞比前腦組織來(lái)源的更容易分化黑人α片。

Embryonic stem cell has the capability of immortalization and pleuripotent differentiation.

胚胎干細(xì)胞源于著床前的囊胚內(nèi)細(xì)胞團(tuán)或早期胎兒原始生殖細(xì)胞的一類(lèi)未分化的多能性干細(xì)胞国产日韩区，具有無(wú)限增殖和多能分化的能力。

Axial elongation of inner isodiametric cells of the globular somatic embryo followed by the change in the growth axis of the procambium was an important event in heart-shaped or oblong-stage somatic embryo.

球形胚內(nèi)部等徑細(xì)胞軸向延長(zhǎng)GOGO大胆国模一区二区私拍，接著前形成層生長(zhǎng)軸發(fā)生變化三轮美女毛片美女毛片美女，這些是心形胚或橢圓形體胚中的重要事件。

Embryonic development: During normal cloaca development process in rats, before gestational days 15, the urorectal septum developed and clearly demarcated the boundaries of the future rectum dorsally and urogenital sinus ventrally.

結(jié)果 ①胚胎發(fā)育：泄殖腔發(fā)育過(guò)程中www.国产精品久久久久久，胎齡15天前的正常鼠胚亚洲不卡视频在线播放，尿直腸隔將泄殖腔分為腹側(cè)的尿生殖竇和背側(cè)的直腸兩部分，二者共同相通于泄殖腔管日韩孕妇自拍视频直播在线观看网站。

Self-pollination was brought as the essential reason for causing emptied seeds by former researchers. Based on those studies, potassium antimonate and electron microscopy were used to study the calcium distribution of pollens in the micropylar canal of self-pollinated and cross-pollinated ovules and morphological changes in certain cells undergoing programmed cell death from pollination to fertilization, and observation of histo-chemical changes during microgametopyte development was performed by paraffin section.

前人研究認(rèn)為自交是華北落葉松產(chǎn)生空粒的主要原因美女被c视频，本論文在此基礎(chǔ)，運(yùn)用焦銻酸鉀沉淀法配合電鏡觀察研究了傳粉后到受精前異交控制和自交輔助授粉胚珠珠孔道內(nèi)花粉的鈣分布情況欧美男免费A片视频，及此過(guò)程中細(xì)胞程序化死亡超微結(jié)構(gòu)的變化JIZZ中国国产在线，并通過(guò)石蠟切片研究了華北落葉松傳粉后到受精前雌配子體發(fā)育過(guò)程及細(xì)胞內(nèi)含物的變化，以研究在受精前胚珠內(nèi)是否存在花粉識(shí)別與選擇系統(tǒng)国产精品盗摄盗拍最新视频，探討鈣信號(hào)傳導(dǎo)和花粉與胚珠相互作用及細(xì)胞程序化死亡的關(guān)系人妖系列。

Normal rat embryos and embryos with ARM from gestational days 12.5to 20were sectioned serially and sagittally and stained with HE to observe development of cloaca and anorectum continually and contrastively.

2·結(jié)果①胚胎發(fā)育：泄殖腔發(fā)育過(guò)程中，胎齡15天前的正常鼠胚人人操人人操人人人干，尿直腸隔將泄殖腔分為腹側(cè)的尿生殖竇和背側(cè)的直腸兩部分在线色网站，二者共同相通于泄殖腔管欧美好色aaa。

In a giving stage after pollination,p53 homologue showed high levels in the antipodal cells,integument,immature endosperm,ovary wall,tracheary elements,and aleurone layer,while c-myc homologue showed low levels in these tissues,only before pollination showed high expression in polar nucleus.

結(jié)果發(fā)現(xiàn)，在授粉后的一定階段国产日日操夜夜操，在反足細(xì)胞爱爱网址、珠被、未成熟的胚乳人人操人人干综合网、子房壁yilef.com、導(dǎo)管組織和糊粉層中，p53同源基因表達(dá)強(qiáng)烈国产精品视频你懂的97，c-myc同源基因的表達(dá)相反国产v欧美v日韩v亚洲老妇，在授粉后的這些組織中基本不表達(dá)，而在授粉前的中央細(xì)胞的極核中表達(dá)水平較高鲁鲁鲁免费视频。

Dorsal enclosure go along the blastokinesis anaphase andaccomplishes at the same time at 48th hour; The embryo eats up yolk unenveloped into themidgut before hatching.

背合在胚動(dòng)的后期進(jìn)行99久久久国产，在48h胚動(dòng)與背合同時(shí)完成；在桔小實(shí)蠅卵孵化前搜索超碰在线操人妻。，胚胎的發(fā)育主要是通過(guò)未包入中腸的卵黃供給營(yíng)養(yǎng)欧美精选1。

The results showed that the expression of calm3 and trm112l genes had no remarkable differences in oocytes and 8-cells stage embryos, but were significantly different in blastocysts. It was supposed that these two genes were possibly maternal genes, and they might be involved in oocyte maturation and zygotic genome activation.

結(jié)果顯示，在卵母細(xì)胞和8細(xì)胞期胚胎网站在线观看视频免黄，基因calm3和trm112l的表達(dá)量無(wú)顯著性差異国产一级a，而在囊胚期的表達(dá)量與前兩個(gè)時(shí)期的表達(dá)量存在顯著性差異，推測(cè)這兩個(gè)基因在牛胚胎發(fā)育過(guò)程中的表達(dá)可能屬于母型調(diào)控人操人操人操人操人操人操人操，提示該基因在卵母細(xì)胞成熟和合子基因激活中起一定作用亚洲天堂的无码在线视频。

The receptors were obviously densest at the filiform apparatus of the synergids.

麥芽凝集素受體在受精前的中央細(xì)胞和卵細(xì)胞膜表面均勻分布，而在受精后的合子和初生胚乳細(xì)胞膜表面缺失国产嫖娼妓院视频网站。

blastocyst：(囊)胚泡[見(jiàn)于哺乳動(dòng)物著床前的胚囊]

blastocoel 囊胚腔 | blastocyst (囊)胚泡[見(jiàn)于哺乳動(dòng)物著床前的胚囊] | blastoderm 胚層;胚盤(pán)

blastoderm：胚層;胚盤(pán)

blastocyst (囊)胚泡[見(jiàn)于哺乳動(dòng)物著床前的胚囊] | blastoderm 胚層;胚盤(pán) | blastogenesis 芽基發(fā)育[見(jiàn)于無(wú)脊椎動(dòng)物]

epiblast：外胚葉

它通常呈鞘狀與外胚葉(epiblast)分離開(kāi)來(lái),單純成為幼根的保護(hù)器官. 但在水稻等植物中它與外胚葉的區(qū)別并不明顯,因此,莫如把這部分看作是胚的器官中尤其是幼根出生時(shí)前胚組織的殘留部分較為妥當(dāng).

pronephros：前腎

1.前腎 前腎(pronephros)發(fā)生最早,人胚第4周初,位于頸部第7~14體節(jié)的外側(cè),生腎索的頭端部分形成數(shù)條橫行細(xì)胞索(前腎小管),其內(nèi)側(cè)端開(kāi)口于胚內(nèi)體腔,外側(cè)端均向尾部延伸,并互相連接成一條縱行的前腎管(pronephric duct).

wheat germ：小麥胚芽

還記得上回說(shuō)過(guò)加入"小麥胚芽(Wheat Germ)的土司失敗,變成有點(diǎn)像發(fā)糕一樣嗎??小嬸前兩天做了一次加入少量小麥胚芽的土司有成功,所以這一次我也不死心的又想再試試看,只不過(guò)這次學(xué)聰明了,沒(méi)有把小麥胚芽加入全部的面團(tuán)當(dāng)中,

nephrotome：生腎節(jié)

論述脊椎動(dòng)物前腎,中腎和后腎的~與功能 專(zhuān)家指導(dǎo): 一、腎臟的幾種類(lèi)型 腎臟是由中胚層的中節(jié)(mesomere)形成的生腎節(jié)(nephrotome)組成的. 在無(wú)羊膜動(dòng)物,腎臟的發(fā)生要連續(xù)經(jīng)過(guò)前腎(胚胎期)和背腎(成體)兩個(gè)階段;在羊膜動(dòng)物則需經(jīng)歷3個(gè)階段,即前腎中日欧美野外日一级黄色A片在线日、中腎

postembryonic development：胚后發(fā)育

加之胚胎發(fā)育又在卵中進(jìn)行,所以在討論昆蟲(chóng)個(gè)體發(fā)育過(guò)程時(shí),常以胚胎發(fā)育(embryonic development)為基點(diǎn),把胚胎發(fā)育前的精欧美精品理论片大全、卵形成期叫昆蟲(chóng)的胚前發(fā)育(preembryonic development),把胚胎完成后到性成熟的過(guò)程叫胚后發(fā)育(postembryonic development).

proembryo：原胚

胚在沒(méi)有出現(xiàn)分化前的階段,稱(chēng)原胚(proembryo). 由原胚發(fā)展為胚的過(guò)程,在雙子葉植物和單子葉植物間是有差異的. 1.雙子葉植物胚的發(fā)育 雙子葉植物胚的發(fā)育,可以薺菜為例說(shuō)明,合子經(jīng)短暫休眠后、不均等地橫向油裂為基細(xì)胞和頂端細(xì)胞.

pronephric duct：前腎管

1.前腎 前腎(pronephros)發(fā)生最早,人胚第4周初,位于頸部第7~14體節(jié)的外側(cè),生腎索的頭端部分形成數(shù)條橫行細(xì)胞索(前腎小管),其內(nèi)側(cè)端開(kāi)口于胚內(nèi)體腔,外側(cè)端均向尾部延伸,并互相連接成一條縱行的前腎管(pronephric duct).

prothoracic gland：前胸腺

四,前胸腺 前胸腺(prothoracic gland)又叫脫皮腺或胸腺,位于頭部或前胸兩側(cè),是 1 對(duì)透明,帶狀的細(xì)胞群體. 前胸腺在胚后發(fā)育過(guò)程中,腺細(xì)胞在每一個(gè)齡期都有明顯的分泌活動(dòng)周期, 它是在腦神經(jīng)分泌細(xì)胞分泌活化激素的刺激下進(jìn)行的.前胸腺在無(wú)翅亞綱中 終生存在,