查询词典 precursor

In addition, the liquid impregnation of a preform by a pitch or some other precursor is described.

此外，一个预制的摊位或其他易制毒化学液体浸渍描述。

Objective To study the effect of gypenosides on proliferation of neural precursor cells in vitro.

目的 探讨不同浓度绞股蓝皂苷对体外培养的神经前体细胞增殖能力的影响。

The substituted half-sandwich titaconece with bulky alkoxyl group [CpTiC1〓 or CpTi 〓] or indene ring can not be fluorinated by BF〓·Et〓O under the selected condition, but still coordinates with the BF〓, this coordination then enhances the steric effect that stabilizes the precursor and hinders the reduction of the Ti to the Ti species, reflected in the decrease in polymerization activity.

但是这个转化受主催化剂分子的空间位阻和聚合反应温度的影响，当主催化剂为大位阻的烷氧基取代茂钛络合物或茚钛络合物时，在一般的聚合温度下BF〓不能对它们进行氟化，但可以和其中的OR配位，这种配位进一步加剧了空间位阻，从而阻碍了活性中心的形成，导致催化活性的下降。

Zhao's prominent accomplishments of music make him a precursor in the history of modern Chinese musical inditement.

他在音乐创作上有着突出的成就，是我国近现代史上音乐创作的先驱人物。

The liver oval cell line WB-F344 derives from adult normal Fisher 344 male rats. It's a kind of liver infantine epithelial cells and has characteristics of liver stem cells. Many studies in vitro and in vivo imply that it has the role as precursor cells of hepatocacinoma, which indicates its function in hepatocarcinogenesis.

肝卵圆细胞株WB-F344来自正常成年同基因Fisher344雄性大鼠，是一种肝脏幼稚上皮细胞，具有肝脏干细胞的性质，体内、外的许多研究表明，它与肝癌的发生有一定的关系，具有肝癌前体细胞的作用。

The liver oval cell line WB-F344 derives from adult normal Fisher 344 malerats.It's a kind of liver infantine epithelial cells and has characteristics of liver stemcells.Many studies in vitro and in vivo imply that it has the role as precursor cells ofhepatocacinoma,which indicates its function in hepatocarcinogenesis.

肝卵圆细胞株WB-F344来自正常成年同基因Fisher344雄性大鼠，是一种肝脏幼稚上皮细胞，具有肝脏干细胞的性质，体内、外的许多研究表明，它与肝癌的发生有一定的关系，具有肝癌前体细胞的作用。

The results show that the ratio of the released elastic energy to the damage dissipative energy can be served as a sensitive precursor of catastrophe. Furthermore the value of the non-dimensional ratio has a similar tendency to be 1 with different responses in the two failure modes, that is, the response function R always decreases in the gradual mode, while increases and tends to be infinite at the catastrophic point of the failure.

研究发现在灾变性破坏和非灾变性的渐进式破坏两种失效模式中，虽然系统中卸载所贡献的弹性能增量与损伤消耗和释放的能量增量的比值都有趋向于1的趋势，但是两者的趋近方式不同：灾变性破坏时表征能量比随控制变量变化特征的响应函数R有一个上升段，在灾变破坏点$R$趋向于无穷大，而非灾变性破坏中$R$始终是减小的。

Internet Relay Chat , or IRC , is the precursor to both instant messaging and contemporary browser-based chatrooms like those found on Yahoo!

在线聊天系统，或者 IRC ，是即时信息和同时代的以浏览器为基础的聊天室，如 Yahoo！

Ordering of spheres, filling of interstices in colloidal crystals with precursor and removal of the template are all key factors for the synthesis of the 3DOM complex oxides.

其中，胶体晶体模板的组装、前驱体的填充以及模板的去除都是制备3DOM复合氧化物的关键影响因素。

Could be a precursor to intestinal intussusception.

会不会是肠套叠的前兆？

Use nationalization degree and the relationship that commercialize degree, condition of calculable market economy plays scope of optimal and state-owned economy.

利用国有化程度与市场化程度的关系，可计算市场经济条件下最佳国有经济规模。

The kinds of extractant also effected desulfurization rate .

萃取剂对脱硫率的影响也很大，乙二胺的萃取效果优于甲醇的。