根据脂肪烃、多卤联苯、卤代苯和稠环芳烃等80种非极性有机化合物在鱼体中生物富集因子（BCF）的实测数据，建立了有机物在鱼体中生物富集因子的片段常数法估算模型。

Relationship between bioconcentration factor and fragment constants was investigated. A prediction model was developed on the basis of the observed BCF values of 80 non-polar organic compounds.

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对交换环定义了广义p F环的概念，即一切具有常数秩的有限生成投射模都为自由模的交换环。

A generalization of PF rings relative to commutative rings: rings all finitely generated projective modules with constant rank of which are free is defined.

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实验结果表明：固定化细胞的球形和拉西格环陶瓷载体的发酵动力学常数与粒径大小存在明显差异；

Fermentation kinetics parameters obtained by experiment were found to vary markedly with particle size of spherical and rishig ceramic carriers containing the immobilized cells.

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