丙二烯

Could keep above 95% in the fixed beds. In order to achieve high stereo-selectivity with yeast, ethyl acetoacetate was used as the model substrate,and a novel approach was proposed to selectively inhibit R-enzymes in yeast before reaction.

以乙酰乙酸乙酯为模型底物，以丙烯酸、乙醚、二甲基亚砜、丙烯酰胺、正己烷等有机溶剂选择性地抑制酵母中R型酶，提高反应立体选择性。

Objective To evaluate the therapeutic effects of 5-allyl-7-gen-difluoromethylenechrysin on the growth of xenograft tumor of human lung carcinoma in nude mice.

目的研究5-烯丙基-7-二氟亚甲基白杨素对人肺癌A549细胞裸鼠移植瘤生长的影响。

Coolant Composition Engine coolant is generally a mixture of ethylene or propylene glycol base antifreeze and water.

冷却组成发动机冷却液是一种混合乙烯、丙烯乙二醇和水制药基地。

Blow dry damage can be prevented by using products containing glycerin and propylene glycol because these actives retard water evaporation.

吹干头发的损伤是可以通过使用一些含有甘油和丙烯乙二醇的产品来预防的，因为这些有用的成分可以减缓头发的水分流失。

The basic principle of the toughening and modifying on bismaleimide resin was introduced, the characteristics and the modifying effects of the toughening and modifying with thermoplastic resin, the combination of aromatic diamine and epoxy resin, organic silicone, allyl compounds, cyanate ester resin, the blends of three-dimensional braided carbon and Kevlar fabrics and so on were discussed.

介绍双马来酰亚胺树脂增韧改性的基本原理，论述了热塑性树脂增韧改性、芳香族二胺和环氧树脂相结合增韧改性、有机硅增韧改性、烯丙基系列化合物增韧改性、氰酸酯树脂增韧改性、三维编织碳纤维和凯夫拉纤维混合增韧改性等方法的特点与改性效果。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。