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But after much tinkering with different combinations of detergent, ions, and chemical additives, Strynadka's team was able to crystallize the enzyme so that it would diffract x-rays into a pattern that would ultimately reveal its natural structure.

但是在多次与不同结合物去污剂、离子和化学添加剂等组合后， Strynadka 小组终于能够使该酶结晶，以至能经过 x 光衍射成图像，最终显示它的本来结构。

According to the simulation of up-flowing ions i. e., O (superscript +, H (superscript +) and He (superscript +) distribution function and using dynamic equation during dipolarization in substorm in magnetotail, ion acceleration and energization are investigated.

根据采用动力学方程对亚暴期间磁尾磁场向偶极形弛豫过程中离子分布函数的模拟结果，研究了磁尾来自电离层的O， H和 He离子的速度及能量随时间的变化。

The results show that,(1) the ion acceleration and energization mainly occur in the middle of dipolarization at distance of -12 R to -8 R,(2) the ion acceleration and energization along the direction perpendicular to magnetic field are faster than along parallel direction,(3) variations of speed and energy for lighter ion are faster than that of heavier ion,(4) the higher the initial energyis, the faster the ion acceleration is, and the more energy is obtained by the ions.

主要结果为：(1)离子的加速及能量变化主要发生在磁场偶极化过程的中期，对应的地心距离位於-12R到-8R之间；(2)垂直於磁场方向上离子加速及能量变化较快，平行方向上较慢；(3)轻离子较重离子加速及能量变化快，磁场偶极化终结，3种离子的能量均可增加200倍左右；(4)初始能量较高时，离子加速及能量变化较快，离子最终获得的能量较大。

The results show that,(1) the ion acceleration and energization mainly occur in the middle of dipolarization at distance of -12 RE to -8 RE,(2) the ion acceleration and energization along the direction perpendicular to magnetic field are faster than along parallel directi on,(3) variations of speed and energy for lighter ion are faster than that o f heavier ion,(4) the higher the initial energyis,the faster the ion accelerati on is, and the more energy is obtained by the ions.

主要结果为：(1)离子的加速及能量变化主要发生在磁场偶极化过程的中期，对应的地心距离位于-12RE到-8RE之间；(2)垂直于磁场方向上离子加速及能量变化较快，平行方向上较慢；(3)轻离子较重离子加速及能量变化快，磁场偶极化终结，3种离子的能量均可增加200倍左右；(4)初始能量较高时，离子加速及能量变化较快，离子最终获得的能量较大。

Based on the dynamic equation, the transport and acceleration of out-flowing ionospheric ions in the magnetosphere are studied by means of finding the ion distribution function. They include two parts: the study of static ion distribution with analysis and numerical compute; the study of ion acceleration by induced electric feild in the period of dipolarization of taillike geomagnetic lines in the substorm expansion phase with the numerical simulation of the ion distribution function.

本文在磁层中上行离子的加速与传输理论研究领域中，采用动力论方程，用求解离子分布函数的方法来研究问题：(1)用解析求解和数值计算的方法，对上行离子在不同Kp指数条件下磁场位形中的定态分布进行了研究；(2)用数值模拟计算分布函数的方法，对上行离子在亚暴膨胀相磁场向偶极形驰豫过程中受磁尾的感应电场加速进行了研究。

The surface action mechanism of sodium polydithio dipropyl sulfonate in acidic Cu plating bath indicates that the surface complex produced by adsorbed sodium polydithio dipropyl sulfonate and Cu + resists copper ions' electrodeposition.

酸性镀铜溶液中表面活性剂聚二硫二丙烷磺酸钠的表面作用机理表现为：吸附态的聚二硫二丙烷磺酸钠与Cu＋形成表面络合物阻化铜离子的电沉积。

Stressed plants diminish osmotic potential by accumulating free amino acids, ions and dissolvable substances.

被盐胁迫的植物因自由氨基酸、离子和可溶性物质的积累造成渗透压减弱。

EPR study of the thermal products of these montmorillonites shows that g = 2. 14 signal relates with hydrated copper ions existing in the interlayer of montmorillonites and g = 2. 07 signal relates with Cu~(2+) occupying the ditrigonal cavities of Si-O sheet. And, the supper fine line of g ca. 2. 2 - 2. 7 suggests Cu~(2+) migrating into octahedral vaeancies.

同时，该蒙脱石热处理产物的EPR研究表明、g=2.14信号与蒙脱石层间的水合铜离子相关， g=2.07信号和g为约2.7-2.2超精细结构线分别与进入了粘土矿物Si-O四面体片复三方形孔洞和铝氧八面体空位中的Cu相关。

EPR study of the thermal products of these montmorillonites shows that g=2.14 signal relates with hydrated copper ions eXisting in the interlayer of montmorillonites and g=2.07 signal relates With Cu,occupying the ditrigonal cav- ities of Si-O sheet.And,the supper fine line of g ca.2.2-2.7 suggestrs CU migrating into octahedral vacancies.

同时，该蒙脱石热处理产物的EPR研究表明、g=2.14信号与蒙脱石层间的水合铜离子相关， g=2.07信号和g为约2.7-2.2超精细结构线分别与进入了粘土矿物Si-O四面体片复三方形孔洞和铝氧八面体空位中的Cu相关。

The mechanism may be related to reducing brain cholinesterase activity, inhibiting the accumulation of aluminium ions in brain, maintaining the normal level of Glu/GABA.Key words:Prepared Radix Rehmanniae; Learning and memorizing; Dysmnesia

结论熟地黄对于化学药品所致记忆障碍模型小鼠具有增强其学习记忆和空间记忆能力的作用，其作用机制可能与改善中枢胆碱能神经系统功能，降低脑内Al3 含量，保护脑组织及维持脑内Glu/GABA的正常水平有关。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐