酸基

Objectives and methods: The present study is undertaken to examine our hypothesis that with the accumulation of ion channels, increased sialic acids at the injury site or DRG somata result in a reduction of net transmembrane potential that evoke ESD in injured neurons.

膜蛋白的一个共同特性是其膜外域接受密集的糖基化，糖基含有大量带负电的唾液酸，如大部分离子通道，特别是电压依赖性的钠通道含有大量的唾液酸，而且这些负电荷靠近钠通道的电压感受器而易化通道开放。

Methods 2-(piperazin-1-yl)-1-(pyrrolidin-1-yl)ethanone (2) was synthesized from pyrrolidine via amidation and substitution, followed by treating with chloroacetyl chloride and triphenylphosphine in a "one pot" manner to give the corresponding phosphonium chloride 3 in a stable and pure form after crystallization from isopropanol.

以四氢吡咯为原料，先与氯乙酰氯成酰胺，再与哌嗪发生取代反应制得中间体［（1-四氢吡咯基）甲基］哌嗪(2)；化合物2与氯乙酰氯和三苯基膦反应，经异丙醇重结晶得到稳定的有机鏻盐(3)；化合物3与3，4，5-三甲氧基苯甲醛发生Wittig反应，再与马来酸成盐得目标化合物马来酸桂哌齐特(1)。

An approximately linear relation is obtained between the value of at the maximun of the CD band around 250 nm and the number of ionized tyrosyl residues. Obviously the band is attributed to the ionized tyrosin.

在碱性条件下，于250nm附近出现一新的CD带，它的强度与离解的酪氨酸残基个数呈线性关系，说明这一新带主要是由离解的酪氨酸残基产生的。

Mass spectroscopy is so sensitive, though, that it can tell the difference between a nitrated and an un-nitrated peptide.

质谱的灵敏度能够确保把硝基缩氨酸和非硝基缩氨酸分辨出来。

American Heart Association has come to tea is "rich in eliminating free radicals, with the role of acid and flavonoids, one of the drinks, can reduce the incidence of myocardial infarction," the conclusions of the results of their research show that a particular cup of tea free radicals, the even more garlic, broccoli, carrots, cabbage can play a small role of acid-fast.

美国心脏学会曾经得出红茶是&富含能消除自由基，具有抗酸化作用的黄酮类化合物的饮料之一，能够使心肌梗塞的发病率降低&的结论，其研究成果表明，一杯红茶对特定的自由基来说，甚至比大蒜、西兰花、胡萝卜、小卷心菜更能发挥抗酸化作用。

Comb-shaped polycarboxylic -type superplasticizers were synthesized with acrylic acid,mathacrylic acid,sodium allylsulphonateand methoxypolymethacrylatethrough aqueous copolymerization initiated by ammonium persulfate.

将甲氧基聚氧乙烯醚单甲基丙烯酸酯、丙烯酸、甲基丙烯酸和烯丙基磺酸钠进行水溶液共聚，合成了具有梳型结构的聚羧酸系高效减水剂。

In the reduction of 1, 6-diphenyl-1, 6-hexanedione catalyzed by the bis-squaryl proline, good enantioselectivities were obtained, the ee values were up to 90%.We also studied the asymmetric borane reduction of prochiral ketone catalyzed by a series of thiazolidine ligands.

本文考察了由L-半胱氨酸衍生的2-位无取代基的以及2-位芳基取代的噻唑烷酸及醇配体在前手性酮的不对称还原反应中的催化性能。

To assess which Ser/Thr residue could act as a phosphate acceptor upon agonist stimulation, truncation mutants of DORs were constructed by removing the last 15 ( D 15) or 31 ( D 31) residues containing the last three or six potential phosphorylation sites from the C-terminus of the wild-type receptor.

为了研究激动剂诱导下DOR的磷酸化发生于哪一个位点，我们首先构建了C末端区缺失六个丝/苏氨酸残基及三个丝/苏氨酸残基的DOR突变体 D 31和 D 15。

This paper determined Li+ content of LiFePO4/C composite by air-acetylene flame atomic Absorption spectrum method,recovery rate of standard series sample with Fe2+ and PO3-4 and without Fe2+ and PO3-4 were determinated.

采用空气-乙炔火焰原子吸收法测定了LiFePO4/C复合物中的锂含量，考察了不加基体和加入基体的两种标准系列的回收率；因为目前还没有LiFePO4的标准样品和标准分析方法，所以实验采用模拟标准样品考察了不同酸介质和不同酸用量的影响，并进行了Fe2+、PO34-、Cr3+、Mg2+、Mn2+、Co2+、Ni2+离子对测定锂的干扰实验。

AIM To investigate whether the human pro- lidase possesses the G-type organophosphate hydrolyzing enzyme activity besides its ability to catalyze the hydrolysis of the dipeptides bearing a proline residue at the C-terminus.

目的研究人氨酰基脯氨酸二肽酶除催化水解C端为脯氨酸残基的二肽外，是否还有G类有机磷化合物水解酶活性。

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。