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中文摘要：
通过对不同化工厂废水处理池的活性污泥进行富集、不同浓度银离子驯化后，分离得到30株银离子抗性细菌，最大硝酸银耐受量可达80mg·ml^-1．对这些细菌进行质粒抽提与鉴定，质粒检出率为76．67％．40mg·ml^-1的苯甲酸钠对HAg4细菌质粒的消除率可达98．75％；而350μg·ml^-1的吖啶橙对HAg4细菌质粒的消除率只有77．78％．细菌质粒与银离子抗性密切相关．
英文摘要：
Through the enrichment of the active mud obtained from three chemical plants and the domestication with different concentration Ag^＋ solution, thirty bacteria strains with silver （Ag^＋）-resistance were isolated, among which, the highest Ag^＋ -resistant concentration was 80 mg·ml^-1, The plasmids in these bacteria were extracted, with the detection rate of 76.67 %. The elimination rate of the plasmid in HAg4 bacteria was 98.75 % by 40 mg·ml^-1 sodium benzoate, and 77.78 % by 350 μg·ml^-1 acridine orange. It was suggested that the Ag^＋ -resistance of bacteria was highly correlated with their plasmids.
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