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首页> 外文期刊>Applied and Environmental Microbiology >Degradation of the metal-cyano complex tetracyanonickelate(II) by cyanide-utilizing bacterial isolates.
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Degradation of the metal-cyano complex tetracyanonickelate(II) by cyanide-utilizing bacterial isolates.

机译：利用氰化物的细菌分离物降解金属氰基络合物四氰基甲酸酯（II）。

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Ten bacterial isolates capable of growth on tetracyanonickelate(II) [K2[Ni(CN)4]] (TCN) as the sole nitrogen source were isolated from soil, freshwater, and sewage sludge enrichments. Seven of the 10 were identified as pseudomonads, while the remaining 3 were classified as Klebsiella species. A detailed investigation of one isolate, Pseudomonas putida BCN3, revealed a rapid growth rate on TCN (generation time, 2 h), with substrate removal and growth occurring in parallel. In addition to TCN, all isolates were able to utilize KCN, although the latter was significantly more toxic; MICs ranged from 0.2 to 0.8 mM for KCN and greater than or equal to 50 mM for TCN. While growth occurred over a wide range of TCN concentrations (0.25 to 16 mM), degradation was most substantial under growth-limiting conditions and did not occur when ammonia was present. In addition, cells grown on TCN were found to accumulate nickel cyanide [Ni(CN)2] as a major biodegradation product. The results show that bacteria capable of growth on TCN can readily be isolated and that degradation (i) appears to parallel the capacity for growth on KCN, (ii) does not occur in the presence of ammonia, and (iii) proceeds via the formation of Ni(CN)2 as a biological metabolite.
机译：从土壤，淡水和污水污泥浓缩物中分离出十种能够在四氰基甲酸酯（II）[K2 [Ni（CN）4]]（TCN）上作为唯一氮源生长的细菌。 10个中有7个被鉴定为假单胞菌，其余3个被分类为克雷伯菌。对一种分离株恶臭假单胞菌BCN3的详细调查显示，其在TCN上的生长速度很快（生成时间为2小时），同时底物去除和生长同时发生。除TCN外，所有分离株均能利用KCN，尽管后者毒性更大。对于KCN，MIC的范围从0.2到0.8 mM，对于TCN，MIC的范围大于或等于50 mM。尽管生长在很宽的TCN浓度范围（0.25至16 mM）中发生，但降解在生长限制条件下最为明显，而当存在氨时则不会发生降解。此外，发现在TCN上生长的细胞会积聚氰化镍[Ni（CN）2]作为主要的生物降解产物。结果表明，能够容易地分离出能够在TCN上生长的细菌，并且降解（i）似乎与在KCN上生长的能力平行，（ii）在氨的存在下不会发生，并且（iii）通过形成Ni（CN）2作为生物代谢产物。

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