丁基

A method to synthsis a - methylene - r - butyrolactones was reported by the substituted (a - carbethoxyvinyl) cuprate intermediates, generated by the addition of higer order cuprate to acetylenic ester,traping with epoxides stereoselectively.

本文报道了通过以高序铜代替低序铜对炔酸酯加成得到的取代铜与端基或环状环氧化合物的立体选择性反应，较高产率的合成α，β-取代烯酯，进而可合成α-亚烷基-γ-丁内酯类衍生物。

The catalytic system composed of NHPI and transition metal ion can catalyze effectively ethane into acetic acid,cyclane into dicarboxylic acid,toluene into benzoic acid,alkene into epoxide,alkyne into acetylenic ketone,and amide into imide;NHPI used alone can catalyze adamantane to be carbonylated,hydrogen peroxide prepared by oxidization alcohol;NHPI combined with as...

NHPI与过渡金属离子组成的催化体系能高效地催化乙烷氧化为乙酸、环烷烃氧化为二元羧酸、甲苯氧化为苯甲酸、烯烃氧化为环氧化物、炔烃氧化为炔酮、酰胺氧化为酰亚胺；NHPI单独使用能催化金刚烷发生氧化羰基化反应、催化氧化醇制取过氧化氢；NHPI与有机助催化剂如偶氮二异丁腈、溴化季铵盐、蒽醌和醇等也能催化分子氧氧化反应。

In the spring every able-bodied man, and many a sturdy girl, leaves Achill for England or Scotland, where they sell their strong arms to foreign farmers.

每到春天，所有身强力壮的另丁，还有许多健壮的姑娘，都离开阿基尔到英格兰或苏格兰去，把目已有力的双臂卖给外国农场主。

Actinobacillus succinogenes is a promising candidate for the production of bio-based succinic acid.

琥珀酸放线杆菌是发酵生产有应用前景的生物基原料-丁二酸的微生物。

This paper aims to study the effect of agmatine on pc12 cell line injury.

探讨了胍基丁胺对谷氨酸诱导PC12细胞DNA损伤的影响。

The hemodynamic effects of intravenous injection of agmatine and their cellular mechanism were investigated in anesthetized rats.

在麻醉大鼠研究静注胍基丁胺对血流动力学的影响，并初步探讨其机制。

ABSTRACT The cardiac electrophysiological effects of agmatine were examined in guinea pig papillary muscle using intracellular microelectrode technique.

应用细胞内微电极技术，观察了胍基丁胺(agmatine， AGM)对豚鼠乳头肌细胞的电生理效应。

It has been well established that agmatine is an endogenous agonist at imidazoline receptors and noncatecholamine ligand at alpha - 2 adrenergic receptors (α2- AR).

业已证明，胍丁胺是一种内源性的咪唑啉受体激动剂和α2-肾上腺素能受体（α2-AR）的非儿茶酚胺配基。

It turns out that agmatine can inhibit PC12 cell line DNA injury induced by glutamate through block NMDA-R and improve mitochondrial function and reduce glutamate oxidative toxicity.

这说明胍基丁胺具有抑制PC12细胞DNA损伤的作用，其机制可能与其拮抗NMDA受体，改善线粒体功能和减轻谷氨酸的氧化毒性有关。

Alkenyl succinic acidas an anti-rust additive is generally used in steam turbine oil .

分别测定了含烯基丁二酸的汽轮机油/蒸馏水及汽轮机油/合成海水体系的界面张力、界面剪切粘度、油相粘度及乳状液稳定性。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。