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本文研究了竹红菌甲素和还原型谷胱甘肽(GluSH)间的光诱导氧化还原作用。甲素是3,10-二羟基-4,10-苝醌衍生物。在GluSH作为电子给体时,甲素经受可见光诱导的单电子还原,生成年醌自由基或二氢甲素,取决于pH值,同时GluSH被氧化。甲素的单电子还原量子效率随pH值增加而增加。在充氧溶液中甲素敏化氧化GluSH的反应通过类型Ⅰ和Ⅱ的混合机制进行。用ESR检测到了通过Fenton反应产生的羟基自由基。在脂质体包裹的甲素溶液中用动力学测定方法证明了甲素敏化GluSH的氧化是通过类型Ⅱ机制进行的。 相似文献
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<正> 在非交联型聚合物中,接枝共聚物的分子结构最为复杂,它既取决于整个共聚物的分子量分布和平均分子量,又与骨架和接枝链的链长分布和平均链长紧密相关。此外,接枝产物的接枝数分布、平均接枝数、接枝点间链段的平均分子量及其分子量分布等都是描述这类共聚物的重要参数。因此,接枝共聚物分子结构的精确表征,是一个尚待解决的研究 相似文献
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According to the caiculation of quantum chemistry it come be deduced that conngurauons or the catalysts VO(OR)_2Cl-Al (i-Bu)_3, for the alternating Copolymerization of butadiene with propene, the highest reactive configuration was A. When the catalyst complex forms the configuration A, the energy of the system was the lowest; the central vanadium atom had relatively high positive charge and whose frontier orbital overlapped easily with the frontier orbital of butadiene to form coordination complex, so it was concluded from the experimental results and calculations that the configuration of the catalyst of relatively high activity was A. 相似文献
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