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本文采用电喷雾质谱研究了带羟乙基侧臂二乙烯三胺PdⅡ配合物分别与含有硫原子侧链或咪唑侧链的二肽Met-Ala、乙酰化三肽AcGHG和AcGHL,十一肽Mp-11和三十肽氧化胰岛素B链的相互作用,发现该配合物能较好地结合这些多肽,但未能促使它们发生水解反应。比较相应铜配合物及二乙烯三胺铜配合物的切割性能,提示羟乙基侧臂单独难以实现相邻肽键的切割,高配位数金属中心对肽键羰基的活化与羟基的协同进攻是该类配合物切割多肽的可能机制。研究可为人工金属肽酶的发展提供新的设计战略。 相似文献
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用红外光谱和X射线光电子能谱研究了咪唑与金属铜的反应,证明反应生成了咪唑铜盐聚合物,此聚合物能在铜表面形成极薄的保护层,并能引发环氧树脂开环聚合固化,用DSC对咪唑铜盐聚合物引发苯基缩水甘油醚的动力学进行了初步研究,同时测定了界面复合的剪切强度。 相似文献
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本文合成了2-(2-羟基苯基)-1H-苯并咪唑[2-(2-hydroxyphenyl)-1H-benzimidazole)](HPBI)及其铜(Ⅱ)配合物(HPBI-Cu),并通过质谱、核磁共振谱、荧光光谱、紫外-可见光谱对HPBI和HPBI-Cu进行了表征,用MALDI-TOF质谱、红外光谱、核磁共振波谱和荧光光谱研究了HPBI-Cu与一氧化氮(NO)的反应机理。实验结果表明HPBI-Cu对NO具有很好的专一性,反应中铜(Ⅱ)被还原为亚铜(Ⅰ),同时HPBI被NO亚硝酰化。将具有低细胞毒性的HPBI-Cu用于检测脂多糖(LPS)激活的小鼠巨噬细胞Raw 264.7中的NO,发现它具有较好的分辨率和灵敏度,有望成为细胞或组织中NO成像的荧光探针。 相似文献
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Three-axis magnetic flux leakage in-line inspection simulation based on finite-element analysis 下载免费PDF全文
With the increase of pipelines, corrosion leakage accidents happen frequently. Therefore, nondestructive testing technology is important for ensuring the safe operation of the pipelines and energy mining. In this paper, the structure and principle of magnetic flux leakage (MFL) in-line inspection system is introduced first. Besides, a mathematic model of the system according to the ampere circuit rule, flux continuity theorem, and column coordinate transform is built, and the magnetic flux density in every point of space is calculated based on the theory of finite element analysis. Then we analyze and design the disposition of measurement section probes and sensors combining both three-axis MFL in-line inspection and multi-sensor fusion technology. Its advantage is that the three-axis changes of magnetic flux leakage field are measured by the multi-probes at the same time, so we can determine various defects accurately. Finally, the theory of finite element analysis is used to build a finite element simulation model, and the relationship between defects and MFL inspection signals is studied. Simulation and experiment results verify that the method not only enhances the detection ability to different types of defects but also improves the precision and reliability of the inspection system. 相似文献
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通过不同分子量的对-氨基苯甲酸酯封端的聚(四次亚甲基)醚和均苯甲甲酸二酐反应,合成了聚醚聚酰胺酸;然后以不同重量比将聚醚聚氨酯和聚醚聚酰胺酸溶液混合反应亚胺化,制备了一系列不同硬段含量的聚醚聚氨酯-聚醚聚酰亚胺合金。用傅立叶变换红外光谱、动态力学分析、示差扫描量热、广角X-衍射、应力应变试验等分析测试方法对合金进行了研究,结果表明聚醚聚氨酯-聚醚聚酰亚胺合金具有很好的相分离结构,是一类新型耐高温、有韧性的热塑性弹性体。聚醚分子量相同的聚氨酯和聚酰亚胺形成的合金软段相容,合金具有两相结构;聚醚分子量不同的聚氨酯和聚酰亚胺形成的合金软段存在相分离,合金具有三相结构,表现在材料外观上分别为透明不透明的韧性膜,少量聚酰亚胺的掺入,能大大增加材料的耐热性能,而合金的材料力学性能没有明显变化。 相似文献
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