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N-Substituted chemical modification of valiolamine ,as well as the inhibitory activity of these compounds against porcine and rat intestinal maltase and surase are discussed in detail.

井冈霉醇胺、井冈霉胺和井冈胺等假氨基糖类物质是新型的α糖苷酶抑制剂，对其进行化学修饰可以得到糖苷酶抑制活性更强的N 取代假氨基糖衍生物。

Mannerism theory has been substituted by constructions theory, which was regarded as basic teaching theory in the traditional teaching.

以往在传统教育中被视为教育理论基础的行为主义理论已淡出历史舞台，取而代之的是建构主义理论。

In the proposed algorithm the traditional fixed step size iteration is substituted by time-varying step size iteration to improve the accuracy of directional estimation while the minimum mean square deviation is solved to achieve the purpose of increasing the convergence speed of the proposed algorithm.

以一种时变步长迭代方法取代传统的定步长迭代法，旨在提高算法在求取均方差最小值的过程中方向估值的精度，从而达到提高算法收敛速度的目的。

In the coupling reaction of 4 with 2-methyl-1-buten-3-yne the four- membered ring ligand is transferred to enyne to give the substituted eta3-butadienyl complex 5 containing the cyclobutenonyl group.

在4与2-甲基-3-炔-1-丁烯进行偶合反应后，四环结构仍然稳固存在，并转移到烯缺上形成一个含有四环结构的错合物5。

A series of 2-substituted phenyl thiazonaphthalene carboxamides was designed and synthesized via decarbonylation reaction mediated by mercuric oxide.

通过HgO调节的脱羧反应，设计并合成了一系列新型的2-取代苯基噻唑并萘酰胺类化合物。

The meritoriousness of good works, indulgences, the worship of the Virgin, saints, and relics, the sacraments (other than baptism and the Eucharist), the dogma of transubstantiation and the Sacrifice of the Mass, purgatory, and prayers for the dead, auricular confession, celibacy of the clergy, the monastic system, and the use of the Latin tongue in public worship, for which the vernacular languages were substituted.

的体面的优秀作品， indulgences ，崇拜美属维尔京，圣人，和文物的圣礼中，教条的transubstantiation和牺牲的质量，炼狱，并祈祷死者的供词耳，独身神职人员的修道院制度，并利用拉丁美洲的舌头在公共崇拜，这白话文的语言所取代。

Magnesium methylate can be prepared by reacting magnesium with dry methanol; Primary alcoholates can be prepared by alcoholysis; the sterically demanding substituted magnesium alcoholates can be prepared by ester exchange or from dialkylmagnesiums.

综上所述，几乎所有的醇镁化合物都可以通过这三种方法进行制备：甲醇镁通过直接合成法制备；伯醇镁通过醇解法制备；仲醇镁或叔醇镁通过酯交换或烷基镁法制备。

This paper consists of studies of synthesis, structure, physico-chemical and catalytic properties of nickel substituted mica montmorillonite .

在本文的第一部分，我们通过改变不同的配料条件和晶化条件，考察了这些因素对NiSMM结晶的影响。

Important Notes: The most ideal food for babies is breast milk, which can be substituted by this milk powder when mother is lack of breast milk or run out of breast milk.

重要提示：婴儿最理想的食品是母乳，在母乳不足或无母乳时可食用本产品。

In this connection, Ar3 and Ar4 independently represent an optionally substituted monovalent aromatic ring.

在这一点上，Ar3和Ar4各自独立地表示任选被取代的一价芳族环。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！