酸性的

By analyzing the differences between acidic and basic catalytic action in this transesterificatios, it is considered that the main cause of yielding an anisole by-product is due to the basic catalysis, a Lewis acidic catalyst is helpful for the selective DPC formation.

通过分析酸碱催化作用在酯交换反应中的差异，认为碱催化是副产物苯甲醚生成的主要原因，Lewis酸性的催化剂有利于碳酸二苯酯的高选择性。

It consists of a chromophore and an apoprotein, and the former has the activity to attack DNA, whereas the latter plays the role in protecting chromophore.

其分子由一个酸性的辅基蛋白和一个发色团结合而成，发色团是LDM的主要活性部分，起着直接断裂DNA的作用，而辅基蛋白的主要作用是保护发色团。

The Mannich bases derived from phenylacetoneand dibenzyl ke- tone (Ⅰ,R=CH_2Ph) prepared in our previous work gave expected semicarba- zones in neutral or slightly acidic media.

几个 Mannich 碱在中性或微酸性的情况下制成它们的缩氨基脲，其中一个Mannich 碱在碱性情况下形成一个含有两分子氨基脲的物质。

The results show that the active loss of heteropolyacid catalyst are mainly attributed to the reduction of surface area, coke formation, and reduction of acid strength during the long term of operation for isoamylene unit. The improvement aspects of the catalyst performance for the decomposition of TAME are proposed.

结果表明，在长周期运行中，催化剂比表面下降、结焦和酸性的损失是导致催化剂活性降低的主要原因，最后提出了TAME裂解催化剂的改进方向。

State Key Laboratory of Coal Conversion, Institute of Coal Chemistry,Chinese Academy of Sciences, Taiyuan 030001The siting of B, Al or Ga and the bridging hydroxyl group in mordenite framework were studied by using ab initio HartreeFock methods. The influence of the presence of B or Ga in the framework on the Bronsted acidity of mordenite was investigated.

用从头计算HartreeFock方法研究了B、Al、Ga等同晶取代进入丝光沸石骨架后可能存在的位置，确定了与电荷平衡质子结合的氧位置，考察了B、Ga等杂原子进入骨架对丝光沸石Brnsted酸性的影响。

Linear dimerization of isoprene to form myrcene ;2. Synthesis of Unsaturated Cyclothioethers byCycloaddition Reactions of Myrcene;3. The traditional synthesis is by the way of Diels-Alder reaction of myrcene with acrolein over Lewis acid catalysts in organic solvent.

二烷基咪唑或烷基吡啶卤化物与ZnCl2 构成一类新型的具有Lewis酸性的离子液体，以其为催化剂和反应介质，通过月桂烯与丙烯醛的Diels Alder反应高区域选择性地合成了对位柑菁醛。

Purified acidic fibroblast growth factor from bovine brain stimulates the proliferation of calvaria-derived osteoblastic cells.

洗涤酸性的纤维原细胞生长因素从似牛的大脑刺激得自头顶osteoblastic房间的增殖。

DDPA adsorbs on zirconia with only one phosphonic group, and another is free.

研究结果表明，DDPA仅以一个膦酸基与氧化锆结合，因而DPZ固定相表面上除了有长链的疏水烷基外，还有酸性的膦酸基和碱性的氨基。

The lysosome is the machinery of last resort for this degradation: it is a highly acidified compartment with many powerful enzymes.

溶酶体是这种降解作用最后凭借的机器：它是非常酸性的分隔区间，有很多强有力的酶。

Previous x-rays of his body were hard to read—the bones, demineralized by acidic bog waters, looked like glass.

早先对其尸体的 X 光扫描结果很难解读，他的骨头因为长期浸泡在酸性的沼泽水中而流失了矿物质，因此看起来象玻璃般脆弱。

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。