In this study, solutions of hydrazine and its derivatives were irradiated using a pulsed electron beam to determine the half-reaction time of radiolysis. 3 D structures of the hydrazine derivatives were optimized, and...In this study, solutions of hydrazine and its derivatives were irradiated using a pulsed electron beam to determine the half-reaction time of radiolysis. 3 D structures of the hydrazine derivatives were optimized, and their energies were calculated using density functional theory with the B3 LYP method and 6-311 +(3 d, 3 p) basis set.For the first time, the 3 D quantitative structure-activity relationship(QSAR) equation describing the relationship between the hydrazine derivative structures and rate of radiolysis has been established using SPSS software.Pearson correlation analysis revealed a close correlation between the total energies of the molecules and half-reaction times. In the QSAR equation, Y =-7583.464 +54.687 X_1+94333.586 X_2,Y,X_1,and X_2 are the half-reaction time, total energy of the molecule, and orbital transition energy, respectively. The significance levels of the regression coefficients were 0.006 and 0.031, i.e., both less than 0.05. Thus, this model fully explains the relationship between hydrazine derivatives and β radiolysis stability.The results show that the total energy of the molecule and orbital transition energy are the main factors that influence the β radiolysis stability of these hydrazine derivatives.展开更多
Based on molecular topological chemical theory,as well as the structural characteristic and the valence connection bonding atom i,we introduced structure information index mE(m=0,1).Combing with electronic structure p...Based on molecular topological chemical theory,as well as the structural characteristic and the valence connection bonding atom i,we introduced structure information index mE(m=0,1).Combing with electronic structure parameter of chlorophenols,the new method with ANN analysis was used to predict the biology-toxicity parameters of chlorophenols.The prediction result was more satisfied than others analysis.展开更多
以20种天然氨基酸的721个3D结构信息描述子经主成分分析,得出一种新的氨基酸描述子——SVTD(Scores Vector of Three Dimension Descriptors),将其应用于血管紧张素转化酶抑制剂与促凝血酶原酶抑制剂的结构表征,并应用偏最小二乘建模方...以20种天然氨基酸的721个3D结构信息描述子经主成分分析,得出一种新的氨基酸描述子——SVTD(Scores Vector of Three Dimension Descriptors),将其应用于血管紧张素转化酶抑制剂与促凝血酶原酶抑制剂的结构表征,并应用偏最小二乘建模方法建立定量构效关系模型,建模复相关系数R2cum、交互检验复相关系数Q2cum分别为0.880、0.778和0.998、0.804。结果表明:SVTD描述子能够系统地表征与生物活性相关的结构信息,该描述子有望成为多肽定量构效关系研究中一种有效的结构表达方法。展开更多
文摘In this study, solutions of hydrazine and its derivatives were irradiated using a pulsed electron beam to determine the half-reaction time of radiolysis. 3 D structures of the hydrazine derivatives were optimized, and their energies were calculated using density functional theory with the B3 LYP method and 6-311 +(3 d, 3 p) basis set.For the first time, the 3 D quantitative structure-activity relationship(QSAR) equation describing the relationship between the hydrazine derivative structures and rate of radiolysis has been established using SPSS software.Pearson correlation analysis revealed a close correlation between the total energies of the molecules and half-reaction times. In the QSAR equation, Y =-7583.464 +54.687 X_1+94333.586 X_2,Y,X_1,and X_2 are the half-reaction time, total energy of the molecule, and orbital transition energy, respectively. The significance levels of the regression coefficients were 0.006 and 0.031, i.e., both less than 0.05. Thus, this model fully explains the relationship between hydrazine derivatives and β radiolysis stability.The results show that the total energy of the molecule and orbital transition energy are the main factors that influence the β radiolysis stability of these hydrazine derivatives.
文摘Based on molecular topological chemical theory,as well as the structural characteristic and the valence connection bonding atom i,we introduced structure information index mE(m=0,1).Combing with electronic structure parameter of chlorophenols,the new method with ANN analysis was used to predict the biology-toxicity parameters of chlorophenols.The prediction result was more satisfied than others analysis.
文摘以20种天然氨基酸的721个3D结构信息描述子经主成分分析,得出一种新的氨基酸描述子——SVTD(Scores Vector of Three Dimension Descriptors),将其应用于血管紧张素转化酶抑制剂与促凝血酶原酶抑制剂的结构表征,并应用偏最小二乘建模方法建立定量构效关系模型,建模复相关系数R2cum、交互检验复相关系数Q2cum分别为0.880、0.778和0.998、0.804。结果表明:SVTD描述子能够系统地表征与生物活性相关的结构信息,该描述子有望成为多肽定量构效关系研究中一种有效的结构表达方法。
