Upon heating the Zeolite at high temperature (450oC)under high vacuum, a new siloxane (Si-O-Si)link is established between two silicon atoms as a result of extraction of a water molecule from the two adjacent silanol group.

在高温(450°C)和高真空下加热这种沸石时,两个相邻的硅醇基脱去一分子水,在二个硅原子之间形成一个新的硅氧烷链接(Si-O-Si)。

属类：化学及生命科学-化学-

In addition polymerization, unsaturated or cyclic molecules add to each other without elimination of any portion of the monomer molecule . The empirical formula of the polymer is then, of course, the same as that of the monomer.

在加聚反应中,不饱和的或环状的分子之间彼此加成,没有消除任何分子,这样,聚合物的实验式就当然与单体的实验式相同。

属类：化学及生命科学-化学-

Such photons will excite the higher vibrational levels of the OH molecule

这种光子会激发OH分子的较高振动能级。

属类：综合句库--

The process of breaking up a molecule with the aid of water is called hydrolysis

这种借助于水而使分子断裂的过程叫水解。

属类：综合句库--

The interaction changes the shape of the enzyme, thus affecting the active site of the usual complex between the enzyme and its substrate (the substance on which the enzyme acts). As a result, the enzyme's ability to catalyze a reaction (see catalysis)is either inhibited or enhanced. If the regulatory molecule inhibits an enzyme in the pathway of its own synthesis, the control is said to be feedback inhibition. Allosteric control enables the cell to regulate needed substances rapidly.

这种相互作用改变了的形状,于是影响了通常与它的基底(在这种物质上面起作用)之间复合物的活动位置。结果,使催化反应的能力或是抑制,或是增强。如果调节分子在它自己合成的途中抑制了,这种控制称为反馈抑制。变构调控使细胞能迅速地调节所需物质的合成。

属类：化学及生命科学-化学-

A molecule where the centers do not coincide is called a polar molecule

正负电荷中心不重合的分子称为极性分子。

属类：综合句库--

Fatty acids are carboxylic acids with a long hydrocarbon chain, usually straight, as the fourth substituent group on the carboxyl (-COOH)group (see functional group)that makes the molecule an acid.

脂肪酸一般由一条偶数碳原子的直链组成,整个长链上及其一端都有氢原子,另一端有一个羧基(-COOH),所以是一种羧酸。

属类：化学及生命科学-化学-

The process by which messenger RNA is synthesized from a DNA template resulting in the transfer of genetic information from the DNA molecule to the messenger RNA.

转移一个由能导致遗传信息从DNA分子上转到信使RNA上的DNA模板合成信使RNA的过程

属类：综合句库--

A molecule striking an advancing piston recoils with increased speed

撞在前进中的活塞上的分子,会加速反跳。

属类：综合句库--

Repression: In metabolism, a control mechanism by which a protein molecule , called a repressor, prevents the synthesis of an enzyme by binding to (and thus hindering the action of)the DNA that controls the enzyme's synthesis.

阻遏作用:代谢过程中的一种控制机构。称作阻遏物的蛋白质与控制合成的去氧核糖核酸结合(因而妨碍了DNA的作用),从而阻止了的合成。

属类：化学及生命科学-化学-