酸基

The stereoselectivity of the reaction of Grignard reagents with perfluoroalkylcarbonyl phosphonates has been studied in detail.

四、我们研究了格氏试剂对全氟酰基膦酸酯的亲核加成-消除反应的立体选择性。

Treatments with Cd at 10~30 μmol/L induced a general increase in activities of guaiacol peroxidase and catalase in leaves.

Cd-S组的POD活力显著高于+Cd+S组。在Cd的诱导下，根部非蛋白巯基及酸不稳定性硫的含量大幅度增加。

Arginine is also the most basic natural amino acid due to its extremely basic guanidine side chain.

由于精氨酸中含有胍基侧链，在20种氨基酸中它的碱性最强。

Although underlying mechanisms ⑴ hae not been elucidated, eidence points to the participation of the nitric oxide and cyclic guanosine 3',5'-monophosphate system.

虽然根本的机制还没有阐明，但是证据显示一氧化氮和环鸟苷酸系统参与其中。这里，我们检测到在MC3T3-E1成骨细胞的分化中基质金属蛋白酶13的mRNA，蛋白和活性的升高，诱生一氧化氮合酶和一氧化氮产物的升高。

This study reported that the hapten of chlorpyrifos was synthesized by using chlorpyrifos reacted with 3-marcapropanoic acid.

由毒死蜱与3-巯基丙酸在碱性条件下反应，合成了毒死蜱半抗原。

DMBQ, resorcin, ferulic acid, and hydroxybenzoic acid were effective chemical signal substances in the inducement of haustorium, but the haustorium formation rate was only 3.3%.

适当浓度的2，6-二甲氧基对苯醌、间苯二酚、阿魏酸和对羟基苯甲酸均可诱导肉苁蓉种子萌发形成吸器，吸器形成率最高为3.3%。

Objective To investigate the effects of transplanted olfactory ensheathing cellsand L-NNA on neuronal survival and axonal regeneration in Clarke's Nucleus after spinal cord hemisection of rats.

目的 探讨嗅鞘细胞移植和一氧化氮合酶抑制剂左旋硝基精氨酸对大鼠脊髓损伤后背核神经元存活及其轴突再生的影响。

Based on the biochemical analysis of the two proteins in vitro, the results of yeast two-hybrid experiment and protein-interaction in both wild type cells and C48 strain, we conclude HetR can form a homodimer through the Cys48 residue. We also show that the dimerization is required for heterocyst differentiation.

基于体外两种蛋白的性质比较和酵母双杂交的结果，并结合相应蓝细菌野生型和突变株C48A中HetR蛋白性质的体内研究表明：HetR蛋白可以通过第48位半胱氨酸残基形成共价结合的同源二聚体，该同源二聚体是异型胞正常分化所必需的。

One-pot reactions of 4 with isocyanates, triphenyl phosphine, hexachloroethane and triethylamine produced 2-anilino-5-arylidene-1-aryl-4,5-dihydroimidazo[1,2-b]-1',2',4'-triazol-4-ones 6 (or 7) in good yields.

而后用4与芳基异氰酸酯、三苯基膦、六氯乙烷和三乙胺"一锅"反应，得到4，5-二氢咪唑并[1，2-b]-1'，2'，4'-三唑-4-酮衍生物6或7。

Firstly, a Ni complex 2 of glutamic acid Schiff base was formed in a 98% yield from chiral auxiliary 2-benzopheone (1) with nickel chloride hexahydrate and L-glutamic acid.

报道了一种采用谷氨酸席夫碱Ni配合物共保护L-谷氨酸α-氨基和α-羧基合成谷胱甘肽(γ-L-谷氨酰-L-半胱氨酰-甘氨酸)的新方法。

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。