当产物积累超出最佳数量时，它将与酶的一个氨酰基位点(变构位点)结合改变其形状，使其不能长时间与底物发生作用。
When the product accumulates beyond an optimal amount it binds to a site (ALLOSTERIC site) on the enzyme, changing the shape so that it can no longer react with its substrate.
胶原酶是一种特异降解胶原螺旋区或明胶，而不作用于其它蛋白质底物的酶类。
Collagenase is one kind of enzymes that can degrade native helical collagen fibrils or glutin but not degrade others proteins.
本文从酶、酶的作用底物和合成体系三个方面综述了酶法合成天冬甜精中的几个问题。
In this paper, several problems on the synthesis of Aspartame using the enzymatic methods were summarized, which involved the enzymes, substrates and synthesis systems.
纤维素吸附区促进酶与底物的结合，有利于催化区对不溶性底物的作用，但对可溶性底物的催化作用无影响。
Cellulose binding domains improve the binding and facilitate the activity of catalytic domains on the insoluble substrate, but not on soluble substrate.
重组菌经培养，利用荧光显微镜检测重组酵母的荧光强度，然后通过荧光分光光度计检测分选酶与底物相互作用后产生游离的EGFP荧光强度进而确定分选酶的酶活。
After cultivation, recombinant cells were verified with fluorescence microscopy and sortase activity was detected by fluorescence spectrophotometer from variety of free EGFP's fluorescence intensity.
而唾液酸是唾液酸苷酶的底物，对唾液酸苷酶具有抑制作用，与很多种病毒的感染和传播关系密切。
Acetylneuraminic acid, the substrate of neuraminidase, which display a inhibitory effects on neuraminidase, has a close relationship with the infection and spread of many kinds of virus.
用L—酪氨酸作底物，测定了银杏叶提取物对酪氨酸酶的非竞争性抑制作用。
The noncompetitive inhibition of EGb on tyrosinase was determined with L-Tryosine substrate.
它是唯一以超氧阴离子自由基为底物的酶，可以催化超氧阴离子的歧化反应产生分子氧和过氧化氢，在南极细菌对恶劣环境的适应中具有重要作用。
These enzymes act to disproportionate two molecules of superoxide anion to hydrogen peroxide and water, and plays important role in extreme environment adaptation of Antarctic microorganism.
底物：酶作用的单分子或多个分子。
Substrate1. The molecule or molecules upon which an enzyme acts.
认识药物代谢的酶学基础，了解药酶的常见底物、诱导剂和抑制剂，合理选用同类药品，能避免有害药物代谢性相互作用的发生。
The adverse drug interactions can be avoided by knowing the enzymology basis of drug metabolism, common substrates, inductors, inhibitors involved and using the same kind of drugs rationally.
本文就这些蛋白酶的种类，底物及其抑制剂的作用作一综述。
In this paper, these types of protease, inhibitors of the substrate and its role reviewed.
有了三维结构的支持，然后他们就使用电脑模型分析酶是如何结合并作用于其底物的。
Armed with the 3-d structure, they then used computer modeling to analyze how the enzyme binds to and ACTS on another molecule, its substrate.
底物：酶作用的单分子或多个分子。
The molecules that are acted upon by enzymes are termed substrates.
被酶作用的分子称为底物。
The molecules that are acted upon by enzymes are termed substrates.
研究表明两种来源的酚氧化酶均参与了黄粉虫幼虫的体壁硬化过程，但在作用方式及与底物的亲和力方面存在差异。
The results showed that both cuticle and hemolymph PO were involved in cuticle sclerotization of T. molitor, but have differences in action mode and affinity to substrate.
方法采用多巴色素法，底物为L-多巴，测定山慈姑及其伪品提取物对酪氨酸酶的激活作用；
MethodsTyrosinase activity was determined by the dopachrome method using L-DOPA as the substrate and the amount of dopachrome in the reactiom mixture was measured by spectrophotometer.
方法采用多巴色素法，底物为L-多巴，测定山慈姑及其伪品提取物对酪氨酸酶的激活作用；
MethodsTyrosinase activity was determined by the dopachrome method using L-DOPA as the substrate and the amount of dopachrome in the reactiom mixture was measured by spectrophotometer.
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