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21 Physicochemical and quantum chemical parameters of 17 kinds of polycyclic aromatic hydrocarbons were calculated by using semi-empirical MOPAC AM1 method. By means of Partial Least Squares (PLS), quantitative structure-biodegradation relationship (QSBR) study was performed with the logarithm of specific biodegradation rates (logKb). The optimal model was obtained, and the result showed that the first-order molecular connectivity index (^1X), the energy of the lowest unoccupied molecular orbital (Elumo), logarithm of n-octyl alcohol/water partition coefficient (logP) and torsion energy (Et) are the dominant factors governing the biodegradability of polyeyelie aromatic hydrocarbons, and the effect of second-order valence molecular connectivity index (^2X^V), the third-order valence molecular connectivity index (^3X^V) and molar refractivity (Rm) should not be ignored. 相似文献
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