The maximum amount of nitrogen chemisorbed at 450°C, which is about 2.75 mmol/g, corresponds to one molecule for every six framework silicon tetrahedron.

在450℃,氮气的最大化学吸附量大约是2.75mmol/g,相当于每六个框架的硅四面体吸附1分子氮气。

属类：化学及生命科学-化学-

The amino acids are joined together in the protein molecule by peptide bonds (--CO NH--)formed by the condensation of α-amino and α-earboxyl groups of different amino acids with elimination of water.

在蛋白质分子中氨基酸是通过肽键(-CO-NH-)连在一起的,肽键是不同氨基酸的α-氨基与α-羧基脱水反应形成的。

属类：工程技术-食品工程-

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 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--