At the time of shedding they contain undifferentiated embryos of no more than a few hundred cells . 在脫落的時候,它們含有不超過幾百個細胞而未分化的胚。
Pathologic study revealed a cystic nephroma with foci of primitive , mesenchymal , undifferentiated , embryonal type sarcoma 病理上顯示為一囊腫性腎細胞瘤合并局部呈現原生間質性,未分化的,胚胎性的肉瘤變化。
Callus 1 . a mass of undifferentiated parenchyma . if a plant is injured , the surrounding uninjured parenchyma cells form a suberin - impregnated callus , sometimes , sealing off the wound 愈傷組織: 1 .一團未分化的薄壁組織。如果植物受到損傷,那么周圍未受傷的薄壁組織就會在傷口處形成具有分生能力的組織,有時可以封閉傷口。
Embryonic stem ( es ) cell lines isolated from primitive embryonic cells are highly undifferentiated and totipotent cells . in vitro , es cells can spontaneously differentiate into embryoid bodies ( ebs ) containing derivatives of three germ layers 胚胎干細胞( embryonicstemcell , escell )系是從早期胚胎細胞分離培養而建立的高度未分化的具有全能性的細胞系。
Rather than injecting undifferentiated stem cells into damaged tissue , using precursor cells from a later stage of development - - ones already “ programmed ” to become retina or some other type of cell - - may be more successful , he says 不是通過注射未分化的干細胞進入損傷組織,使用來自發育后期的前體細胞(已經程序化成為視網膜或其他種類的細胞)可能更成功。
The results showed that es cells derived from kunming albino mouse remained undifferentiated state when they were cultured in vitro for a long time , and karyotypies were stable , but the ability of germ - transmission have not been verified 結果顯示,用昆明白小鼠囊胚所建立的胚胎干細胞在體外長期培養時仍能保持未分化的狀態,核型穩定,但還未證明其具有生殖系嵌合的能力。
Escs can be induced into neuron - like cells by sequential neural induction the undifferentiated escs grew in colonies , with clear bound . alkaline phosphatase staining showed dark brown positive particles were distributed in every esc colony . after the sequential neural induction , the cells converted into neuron - like cells , with homogeneous forms , which had round bright cell bodies and thin long bipolar or multipolar processes 5誘導分化前后細胞端粒酶活性檢測( trap )結果1 .使用序貫誘導法可將escs大比例誘導分化為神經元樣細胞未分化的escs聚集成團狀生長,細胞排列緊密,集落邊界清楚,堿性磷酸酶染色呈強陽性,胞漿布滿棕黑色顆粒。
The primary results showed : using m199 as diluents containing 20 % bovine serum , it is better to freeze the cells slowly freezing at fist then increase freezing speed ( for example , from 0 to - 6 freezing speed is about - 0 . 05 a minute , from - 6 to - 40 , freezing speed is about - 0 . 5 a minute ) , studies on effect of various concentration of dmso demonstrate that about 12 . 5 % dmso gave the highest post - thaw percentage of viable cells . the concentration of bovine serum had no different effect on the percentage of the viable embryo cells of misgurnus auguillicaudatus . the embryo cells derived 6 from the later stage of blastula offish is more resistant to the cryogen than the cells of early stage of blastula . the cells preserved in liquid nitrogen at - 196 were thawed and cultivated , a few cells were found adhere to the surface of culture vessel when the percentage of viable cell was more than 30 % . the cells in only two culture vessels were found to proliferated and gave rise to many small morphologically undifferentiated cells 研究初步表明:以細胞培養液m199 (含2既的小牛血清,常規量雙抗)為凍存稀釋液對泥鰍胚胎細胞冷凍保存宜采取先慢后快的方式(例如,從0一一6 ,凍存速度為一0 . 05 / min ,再以一0 . 5 / min的速度從一6一一40 ) ; dmso的保護效應濃度為12 . 506左右;小牛血清的濃度對泥鰍胚胎細胞的成活率影響不明顯;囊胚晚期細胞抗凍性比中早期強;通過對不同批次的凍存細胞解凍培養,解凍后成活率為30 %以上細胞培養數天后均有少數細胞貼壁,但只發現兩瓶培養細胞有明顯增殖現象產生許多未分化的小細胞。
This concern , recognized by a 10 - year - old , is very real : the potential of gamma - secretase as a therapeutic target is tempered by the fact that this enzyme plays a critical role in the maturation of undifferentiated precursor cells in various parts of the body , such as the stem cells in bone marrow that develop into red blood cells and lymphocytes 這個連10歲小孩都注意到的顧慮,是再實際不過的事了:雖然分泌酶可能是個治療標的,但我們卻不能不注意一個事實:這個酵素對身體各處未分化的前驅細胞(像是可分化成紅血球與白血球骨髓干細胞)的成熟,扮演著關鍵角色。