同时发生

In the second part, we studied the reactions of tonghaosu analogs with mercaptans alcohols and organic metallic reagent under acid condition. Moreover, we synthesized and determined a natural compound by using this kind of reaction.

第二部分研究了茼蒿素类似物在酸性条件下与硫醇、醇、有机金属试剂发生亲核取代反应，同时通过这类反应合成了一天然产物。

With increasment ofE/N,electron average energy and probabilities of electric excitation,dissociation,ionization,dissociative ionization collisions are increased.

随着E/N的升高，电子平均能量升高，发生激发、离化、电离和离化电离碰撞的概率增大；非均匀分布的电场使分子获得更高的离化率，同时显著增强出射电子的能量。

The upheavals occurring in the arts and humanities were mirrored by a dynamic period of change in the sciences.

在艺术和人文领域发生剧变的同时，文艺复兴时期的科学领域也经历著相当活跃的变化。

In PEC trimers, the energy transfer paths in PEC monomers remain, but the transfer rates between the chromophores become higher due to strong couplings between pairs of the nearest neighbor chromophores 1α〓-PVB/2β〓-PCB. Meanwhile, a new energy transfer path with a time constant of about 40 ps emerges among the three β〓-PCB chromophores of C〓 symmetry in PEC trimers.

在PEC三聚体中，在相同单体中的能量传递途径仍存在，由于三聚体毗邻的1α〓-PVB/2β〓-PCB色团对之间的强耦合，使不同色素之间的能量传递速度加快；同时，在PEC三聚体中出现新的能量传递途径：3个具有C〓空间对称性的β〓-PCB之间所发生的较快速的能量传递（约40 ps）。

CAUTIONS; PLEASE LEAVE FAR AWAY FROM TREES AND GRASS! DON'T THROW TOBACCOES TO THE GRASS!

同时，园区绿地已做防寒保护，请您不要将烟头丢在绿地上，以免发生火灾。

To warn that patients are receiving this medication at the same time not to use the excretion of uric acid can inhibit the antihypertensive drugs, such as Thiazide diuretics, including thiazide-type diuretics, as well as the compound preparation of salicylic acid drugs Astemizole aspirin, etc.

需提醒的是，患者在服用此药物的同时，不宜使用可抑制尿酸排泄的降压药物，如噻嗪类利尿剂、含噻嗪类利尿剂的复方制剂以及水杨酸类药物，以防止高尿酸血症的发生。

Ultrasound may make reversible trauma on tissue by its biological effect, increase tiny crack and permeability of plasma membrane, enhance production and secretion of bFGF, promote growth of local microvessel, improve nutrition of microvessel and nerve ending.

通过超声的生物学效应可使组织发生可逆性损伤，细胞膜微小破裂增加，细胞膜通透性提高，同时细胞bFGF产生增加，最后bFGF分泌增加，促进局部微血管的形成，改善微血管和神经末梢的营养状况。

Moreover,in this dissertation,a method ispresented to control safe basin with the fractal erosion,that is by the application ofthe weak parameter periodic perturbation with an optimal frequency to control thefractal erosion basin,and the analytical study shows that the essence of the methodis that the parameter periodic perturbation can be used to delay the occurrence ofhomoclinic tangencies.

并且在本文提出了一种对分形侵蚀安全域进行控制的方法，那就是应用具有最优频率的参数周期扰动对于已受到分形侵蚀的安全域加以控制，在理论分析中得到这种控制分形侵蚀安全域的方法实质上延缓了鞍点同宿相切的发生，同时考虑了外加噪声对控制后安全域的影响，得到这种控制方法具有很好的鲁棒性。

Consequences of the rotation of DNA are illustrated in Figure 9.17 in the twin domain model for transcription. As RNA polymerase pushes forward along the double helix, it generates positive supercoils ahead and leaves negative supercoils behind. For each

超螺旋与转录还有更多的关系，RNA聚合酶转录DNA时，解链和复链同时也发生，如同Fig113中所示，这需要整个转录复合体绕DNA旋转或者DNA自己绕它的双链轴旋转，DNA旋转的后果如Fig11.19所示，图中是一个转录的双结构域模型，当RNA聚合酶沿DNA前移时，在酶前产生正双螺旋，酶后为负的双螺旋；每一个双螺旋转角被RNA跨越后都会在前面产生+1转角，后面产生-1转角。

Substitution of octahedral Mn by these metal ions leads to the decrease of Mn〓 content in the spinels, and thus the decrease in Mn〓 dissolution and Jahn-Teller effect.

金属离子的掺杂一方面减少了Mn〓含量，减少了Mn〓的溶解，同时抑制了Jahn-Teller效应的发生。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失