基于表征生物活性的原子点价(gi)构建取代芳烃的自相关拓扑指数(tG). 用0G、1G及路径数L与取代芳烃对发光菌、大型蚤、呆鲦鱼急性毒性关联,获得令人满意的线性方程依次为:-lg EC50=2.196 33+0.018 901G+0.017 80L, r=0.963 2-lg EC50=2.287 12+0.018 411G+0.010 80L, r=0.968 3-lg LC50=1.786 88+0.034 411G-0.012 01L-0.032 780G, r=0.936 6它们的估算值或预测值均与相应实验值基本吻合.
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