查询词典 active center

These effects may be due to frequent reactivation of the active center for blocky copolymer by hydrogen.

我们推测这可能是由于H_2对发生丙烯二级插入的嵌段性活性中心频繁活化的作用，导致原来不加氢时生成嵌段共聚物转化为加氢下生成无规共聚物。

This is because the electric field may not affect conformation of the active center.

其原因可能是电场作用对活性中心的构象没有影响。

The probe connects rhodamine with artifical enzyme complex, and utilizes the conformational change of SOD active center during the dismutation of superoxide anion to realize the change of the fluorescent intensity of fluorophore.

过程中出现的活性部位结构变化实现荧光团的荧光强度变化，以期实现对O2-。

The results indicate that the three metal complexes could catalyze the disproportionation of the superoxide anion free radical O2(superscript -, and could be used as the active center model complexes of SOD.

结果表明，3种金属配合物均有一定的催化歧化超氧阴离子自由基O2(上-活性，均可被称作超氧化物歧化酶活性中心的模拟配合物。

By means of the deconvolution of the MWD curves by multiple Flory functions, we found that the reason was that introducing MgF_2 into the MgCl_2 support did not change the number of active center types existed in the catalysts.

掺杂MgF_2对聚乙烯的分子量分布的影响较小，对聚乙烯的GPC曲线进行Flory最可几分布函数的分峰拟合结果表明，掺杂MgF_2对催化剂活性中心种类数没有影响。

It was found that the main active center is the iron ions which are in the exchange sites in addition to heteroatom FeZSM-5 itself.

进一步研究发现杂原子FeZSM-5分子筛催化剂上主要活性中心是处在阳离子交换位上的铁离子，同时，由于铁原子进入分子筛骨架，使杂原子FeZSM-5本身也具有一定的反应活性。

Catalyst activity was determined by not only specific surface area of catalyst but also the distributions of active center and utilization ratio of internal surface.

实验结果表明：催化剂活性比为不同催化剂单位质量表面上活性中心的总数目N总值的比值；催化剂活性不仅与比表面有关，还与其活性中心分布情况、内表面利用率有关。

By calculating the sub-cluster parameters and the total antioxidant capability parameter of some kinds of fresh vegetable with diet therapy function, we found that there is clear linear correlation between distribution parameters of biopolymer active center elements (1-x)1/3ln(r1r2/k)、(1-x)1/3ln(k2r1/r2) and antioxidant capability parameter ln[F(1-x)3], and which show monotone decreasing and monotone increasing respectively.

同时对更大范围内的9大类蔬菜和5大类水果的生物高分子活性中心元素分布及其维生素C及维生素E含量进行了考察，结果发现群子统计参数(1-x)1/3ln(r1r2/k)、(1-x)1/3ln(k2r1/r2)与维生素C、E含量参数lnVc(1-x)3、lnVe(1-x)3均分别呈单减和单增的线性关系。

And the mechanism of ATRP is discussed from the view of complex-catalytic reaction. It is deduced that the active center in ATRP is not pure radical but complex active center, which maybe a complex with radical and complex ion. The structure of active center may have a "bridge"structure formed through propaganating radical and transition metal ion, and the active center exists in a"cage"generated by ligand-transition metal ion-organic halide and monomer or solvent.

论文运用基团贡献理论对一些实验现象和结果进行了讨论和分析，并结合研究结果对络合催化引发原子转移自由基聚合反应的机理进行了初步的探讨，认为：过渡金属化合物与有机配体参与的络合催化引发原子转移自由基聚合反应中，聚合反应的活性中心不是纯粹的自由基活性中心，而是与过渡金属相结合的、有着某种"笼"结构存在的复合式活性中心，同时该活性中心以自由基特性为主，同时兼具某种程度的其它活性中心特征（如阳离子和络合聚合活性中心）。

In addition, the 3D-model structure of PvFadA is composed of 11 helixes, moreover,α3,α4,α6 and α7 form a core 4-helix bundle to regards as an active center in this enzyme, similar as acyl-ACP desaturase of Ricinus communis and Mycobacterium tuberculosis H37Rv.

PvFadA的3D结构类似于蓖麻和结核分枝杆菌H37Rv的acyl-ACP去饱和酶。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。