酰化

It has been shown that penicillin amidase was very susceptible to the change of temperature, extremely apt to deactivate in the buffer; while the thermostability of enzyme could be improved by an average of 2～4 times in the reversed micelles.

结果表明，青霉素酰化酶对温度非常敏感，在水溶液中极易失活，而经反胶团包埋后，其热稳定性有很大程度的提高，热失活明显减少。

The hydrolysis course of PenG catalyzed by penicillin amidase entrapped in the AOT/isooctane reversed micelles was investigated.

通过将青霉素酰化酶包埋于AOT/异辛烷反胶团中，对PenG酶促水解过程进行了研究。

At the same temperature, k〓 in the reversed micelles was always less than k＇〓 in the buffer. According to the thermodynamic analysis for inactivation of penicillin amidase in the reversed micelles, the free energy of activation was increased by 2. 71%, while the entropies and enthalpies of activation were decreased, corresponding to 63. 9% and 76. 9% of that in pure buffer respectively.

由热力学分析可知，青霉素酰化酶在AOT/异辛烷反胶团中的热失活过程，与水溶液中相比，活化自由能△G〓增加了2.71％，而活化熵△S〓和活化焓△H〓分别减小为原来的63.9％、76.9％，从而使酶热稳定性平均提高了2～4倍。

In this thesis, the dynamic course of penicillin G hydrolysis to 6-aminopenicillanic acid (6-APA) with penicillin amidase entrapped in the bis (2-ethylhexyl) sulfosuccinate /isooctane reversed micelles was studied.

本文主要研究青霉素酰化酶在反胶团体系中催化青霉素G水解的反应过程，并对反胶团介质中酶的稳定特性、反应动力学以及反应器开发等方面进行了较为系统的研究。

With penicillin amidase entrapped in AOT/isooctane reversed micelles.

根据合理假设，建立了青霉素酰化酶在该耦合系统中水解PenG的反应动力学模型，与实验结果基本吻合。

The results indicate that the optimized sulfonylation reaction time is 4 h, the materiel rate of chlorosulfonic acid and 2-chloroimidazo[1,2-α]pyridine is 1.2 : 1, with ethylamine the yield increasing from 15.4% to above 70%; the optimized ammonolysis reaction time is 3 h and the reaction temperature is 27℃, with the acetonitrile yield increasing from 60.1% to above 79.6%.

实验结果表明，磺酰化反应的最佳反应时间为4 h，氯磺酸与2-氯咪唑并[1，-α]吡啶的用量比为1.2：1，加入三乙胺可将收率由15.4%提高到70%以上；氨解反应的最佳反应时间为3 h，反应温度为27 ℃，加入乙腈可将收率由60.1%提高到79.6%；方案经改进后，总反应时间缩短3 h，收率提高了5.5%。

Three chiral phosphorus ligands were prepared using anisole as the startingat material.Their applications in the asymmetric hydroformylation and asymmetric conjug ed addition of diethylzinc to enones were investigated.

以苯甲醚为原料，合成了三种新的手性含磷配体，考察了三种配体在不对称氢甲酰化反应和ZnEt2对环己烯酮的不对称共轭加成反应中的应用。

Other interesting aspects of the enzyme and its gene are that intracellular PAC activity is under several regulatory controls, such as temperature, oxygen level, catabolite repression and phenylacetic acid induction.

另外，青霉素G酰化酶的基因表达调控非常复杂，在大肠杆菌中，至少有三个不同的启动子可以起动它的转录；可以在转录、翻译、分泌和折叠加工等不同环节进行调控，它的表达调控受温度，溶氧和碳源等环境因素的影响。

It was found that the change of surface potential of the purple membrane resulting from acetylation induced the change of local protein conformation Which could be delocalized all over the protein to a great extent and affected the nature of binding sites of retinal and the structure of the retinal chromophore.

结果表明：酰化引起的表面电位的改变诱导了蛋白局部构象的改变。这种改变在很大程度上离域到整个蛋白分子中而影响了视黄醛结合位点的性质及生色团的结构，从而导致可观察的光谱变化。

Irreversibly inhibits trypsin but not chymotrypsin by alkylating the histidine residue in the active site of the enzyme.

通过乙酰化酶活性位点剩余的组氨酸，不可逆的抑制胰蛋白酶。

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。