活性中心

It was proposed that the higher isomerization activity may be related to the existence of large numbers of strong acid sites.

高的异构化活性可能与催化剂上更多的强酸中心有关。

After more severe heat stress, such as 55℃ for 5 and 10 minutes, the relative content of the inactive PSⅡ center increases to about 130% and 150% of the control, and further accelerates transformation to about 240% and 290%, resp, during the following readaptation to room temperature in 60 minutes.

高温胁迫进一步加强（如55℃5分钟和55℃1O分钟）后，无活性PS Ⅱ中心数目在随后的60分钟室温恢复期中，从恢复开始时为对照的130％和150％继续增加到240％和290％，且有加速转化的趋势。

If it is not severe, such as at 50℃ for 1 minute, the relative content of the inactive PS Ⅱ center decreases to 70% and further to about half of its control during the following readaptation to room temperature in 60 minutes. The reason for this unusual phenomenon is not clear.

发现在高温胁迫不太严重时（如50℃1分钟），无活性PS Ⅱ中心的含量降至对照的70％，在随后室温60分钟恢复过程中继续降为50％。

And photocatalytic activity of the thin films were evaluated by photocatalytic decoloration of methyl orange aqueous solution. The following results and conclusions are obtained. The photocatalytic activity of TiO2 thin films on soda lime glass is lower than that of TiO2 films on pre-coated with SiO2 coating.

研究结果表明：在热处理过程中钠钙离子容易从玻璃基体扩散到TiO2薄膜内，在TiO2颗粒表面和本体形成光生电子和空穴的复合中心，同时抑制具有光催化活性的锐钛矿相TiO2的形成。

The disorder of the thienyl ring and〓 groups in 11, 12 and the disorder of water in the packing of 14 may be responsible for their triboluminescent activities.Ⅲ. A dinuclear triboluminescent complex,〓(15)(where TTA=2- thenoyltrifluoroacetone, PyO=N-oxide pyridine), was synthesised and its crystal structure and triboluminescence spectrum were determined.

X-射线结构分析表明，四个配合物中的铕原子均呈现出八配位的四方反锥几何构型。11、12及13均为有对称中心结构配合物，11、12中的噻吩环及〓的无序以及配合物14晶胞中水分子的无序可能对它们的摩擦发光活性起了很重要的作用。

In this multicenter, randomized trial, we assigned patients with shock to receive either dopamine or norepinephrine asfirst-line vasopressor therapy to restore and maintain blood pressure.

在这个多中心、随机对照试验中，我们指定休克病人接受多巴胺或者去甲肾上腺素治疗作为恢复和维持血压的一线血管活性治

The disorders in centrosymmetric 1, 4, 6, 7 and 9 may correlate with the observed triboluminescent emissions.

而有对称中心结构的配合物1、4、6、7及9中的无序可能对它们的摩擦发光活性起了很重要的作用。

Although the number of patients in each cohort was small, there was evidence of bioactivity, because several patients, especially those receiving 2 or 4 mg of VEGF Trap-Eye, showed substantial improvement in BCVA associated with reductions in foveal thickness.

虽然每个队列患者人数不多，但是有生物活性的证据，因为在某些患者，尤其是那些接受2或4毫克VEGF Trap-Eye者，显示出了最佳矫正视力与中心凹厚度减少相关的实质性改善。

Pymetrazine is chosed as the lead compound, and 21 compounds were firstly designed and synthesized. These compounds were characterized by introducing phenyl derivatives with different functional groups to replace pyridine ring with the isosteric principle and the method of homogeneous synthesis and reasonable biologically designing in order to find new compounds with potential biological activity. These compounds were confirmed by IR, H NMR and MS spectra.

本文选取吡蚜酮为先导化合物，运用电子等排理念，综合类同合成、生物合理设计的方法，引入含有不同官能团的苯基衍生物替代吡蚜酮的结构中心吡啶环，设计合成了21个未见文献报道的化合物，寻找具有潜在生物活性的新三嗪酮类化合物，通过核磁共振氢谱、红外光谱、质谱等手段进行了结构表征，并验证正确。

The results imply that the inhibition of NADPH is due to the earlier binding of NADPH to the enzyme which caused the arm to move from the condensation domain to the reduction domain so as to affect the binding of substrate malonyl CoA and inhibit the activity.

实验结果表明：NADPH对脂肪酸合成酶的抑制可能是由于NADPH在酶上过早的结合而使该酶的活臂向远离缩合中心的方向移动，从而影响了底物丙二酰辅酶A与酶的结合，造成酶活性的下降。

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％。