三种群捕食-食饵离散系统的持久性

研究了具有第Ⅱ类功能性反应的三种群捕食-食饵离散系统，得到了保证该系统持久性的充分条件．     

Effect of calcium ions on the secondary structures of photosystemⅡ and its relations with photoinhibition

Calcium ions play an important role in the oxygen_evolving process of photosystem Ⅱ as demonstrated in many experiments. The changes of the secondary structures of PS Ⅱ induced by the depletion of Ca 2+ were reported. The results indicated that the removal of Ca 2+ led to the transition of α helix to turns and sheet structures. While Ca 2+ was re_added to the media, only the structures changed to turns could be recovered. The protein conformational changes of PS Ⅱ during the donor side photoinhibition induced by the depletion of Ca 2+ were also studied. This showed that the protein conformational changes differed between the control and Ca 2+ _depleted samples in a short period of illumination (within 10 min). However, the changes became similar when the illumination time was increased.     

Bio-rational design of photosystem Ⅱ inhibitors (Ⅰ)──Molecular modeling of cyanoacrylates and ureas in photosystem Ⅱ D1 protein of Pisum sativum

Molecular modeling of cyanoacrylates and ureas with D1 protein of Pisum sativum have been presented. Studies show that these two kinds of inhibitors occupy the similar region in the D1 protein. Cyanoacrylates have more binding sites than ureas, thus they have higher activities.     

温度对第二类哑铃畴畴壁中VBL的影响

实验研究了非压缩状态下第二类哑铃畴（ⅡＤ）畴壁中垂直布洛赫线（ＶＢＬ）的温度稳定性，发现了与材料参量有关的两个重要温度（Ｔ）（ⅡＤ）与（Ｔ０）（ⅡＤ）当温度达到（Ｔ　）（ⅡＤ）时，ⅡＤ畴壁中的ＶＢＬ开始丢失；当温度达到（Ｔ０）（ⅡＤ）时，所有ⅡＤ畴壁中的ＶＢＬ链全部解体。在（Ｔ　　）（ⅡＤ）与（Ｔ０）（ⅡＤ）之间，温度越高，ⅡＤ畴壁中丢失的ＶＢＬ数目越多。     

汇文Libsys5.5和ILASⅡ馆藏统计功能对比分析--以河北工程大学图书馆实践为例

介绍了ILASⅡ和汇文Libsys5.5的馆藏统计功能设置,阐述了汇文Libsys5.5和ILASⅡ馆藏统计功能的应用,提出了ILASⅡ向汇文Libsys5.5转换时应注意的问题。     

EDA技术在数字电子技术实验中的应用

在数字电子技术实验中引入先进的EDA技术是数字电子技术实验教学改革的发展方向。介绍了EDA技术的设计流程及其常用开发软件QuartusⅡ的特点,并利用QuartusⅡ 6.1设计工具通过具体实例阐述了EDA技术在数字电子技术实验中的应用,体现了EDA技术在数字电子技术实验中的重要地位和作用。     

偏置渐开线蜗杆单向点啮合传动凸齿面接触状况分析

讨论了单向点啮合传动蜗轮凸齿面工作时分析齿面接触状况的数值计算方法,用此方法计算所得数据,可以用来评估传动参数对实际重合度、承载能力等的影响,为选择传动参数、优化传动提供依据。     

铅（Ⅱ）的三元混合配体化合物的稳定性研究

测定了铅（Ⅱ）以丙二酸根（ｍａｌ）作为第一配体，以一些氨基酸（ａａ）作为第二配体形成的１：１：１型混合配体化合物的稳定常数ｌｏｇβ＿（１１）。其中氨基酸分别为组氨酸（ｈｉｓ）、脯氨酸（ｐｒｏ）、甘氢酸（ｇｌｙ）、苯丙氨酸（ｐｈｅ）、丝氨酸（ｓｅｒ）、丙氨酸（ａｌａ）和谷氨酸（ｇｌｕ）。计算了混合配体化合物的统计期望值和△ｌｏｇＫ、ｌｏｇＸ值。结果表明，上述混合配体化合物具有额外的稳定性，其稳定性与第二配体的碱性之间存在着直线关系。