解酚假单胞菌的分离及毒物降解的特点

在假单胞菌中有些株可以降解芳香类有机物,另一些株可以抗重金属.某些芳环化合物如苯酚等,及含汞的化合物都是可以造成环境污染的有毒物质.对假单胞菌降解水杨酸等芳香化合物的途径已有一些了解,但少有涉及代谢的调控问题.本文报道一株从化学工业污染区域新分离到的假单胞菌.这株菌不但可以降解水杨酸、苯甲酸及邻苯二酚,而且还能降解毒性较强的苯酚,并具有耐受一定浓度Hg~(2+)的能力,是一株有前途的去污染工程菌.对该菌降解混合芳香化合物的研究发现,邻苯二酚在这些芳香化合物降解代谢中是一个具有调节作用的物质.

The Isolation and Characteristics of Phenol-degrading and Hg-resistant Bacteria

A Pseudomonas species desiganted as S7, was isolated from polluted environment by using a minimal medium containing salicylate as the sole carbon source and a rich medium containing HgCl_2 The organism could degrade and utilize phenol, salicylate, benzoic acid or catechal as the sole carbon source and was resistant to HgCl_2 when it was grown in a rich medium. The minimal inhibitory concentration of phenol for the bacterium was 7.4 mM. The degradation of phenol and salicylate by S7 Was inducible and regulated by catechal or its catabolites as a repressor.