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提出一种新的目标转化因子分析,其初始向量的构造基于实际最大差异光谱,无需分离即可从红外混合体系中解析出纯组份光谱。该算法简单易懂,不必迭代,运算量小,应用于模拟及实际体系,结果令人满意。 相似文献
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电场作用下紫膜中细菌视紫红质的圆二色性研究 总被引:1,自引:1,他引:0
垂直于测量光束的外电场对紫膜水悬浮液中的细菌视紫红质的圆二色性有很大影响。50Hz正弦交流电场作用下产生568nm的正的差圆二色性峰,反向电脉冲串作用下产生556nm左右的负的差圆二色性峰,两峰峰位均未显示有随电压的变化而移动;但是,强度随外加电压的半加而增强;撤去电场后该两峰均即该消失。分析认为,电场下细菌视紫红质中存在柔性结构变化,这种结构变化也可用于存储信息。 相似文献
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Yongtai Zhang Jiansheng Tao Nianping Feng Xiangdong Han 《Crystal Research and Technology》2008,43(9):931-934
The crystallization of calcium oxalate (CaOxa) in aqueous solutions of the extracts of Semen Plantaginis and Folium Pyrrosiae has been investigated, focusing on the inhibition mechanism of some herbs on stone formation. It has been shown that in the presence of extracts of above two herbs, calcium oxalate dihydrate (COD) crystals with typical morphologies of tetragonal bipyramids were obtained. This suggests that the extracts of Semen Plantaginis and Folium Pyrrosiae can promote the formation of thermodynamically unstable COD, and inhibit the formation of calcium oxalate monohydrate (COM), a major component of urinary stone. The formation mechanism of COD crystals induced by Semen Plantaginis and Folium Pyrrosiae is also discussed, indicating that the bioorganic molecules in the extracts of the herbs can induce the nucleation and growth of COD crystals. This study can help us make clear the inhibition mechanism of some herbs on stone formation that is in favor of the prevention and treatment of urolithiasis. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献