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首页> 美国卫生研究院文献>Applied and Environmental Microbiology >Tributyltin-resistant bacteria from estuarine and freshwater sediments.
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Tributyltin-resistant bacteria from estuarine and freshwater sediments.

机译：来自河口和淡水沉积物的抗三丁基锡细菌。

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Resistance to tributyltin (TBT) was examined in populations from TBT-polluted sediments and nonpolluted sediments from an estuary and from fresh water as well as in pure cultures isolated from those sediments. The 50% effective concentrations (EC50s) for populations were higher at a TBT-polluted freshwater site than at a site without TBT, suggesting that TBT selected for a TBT-resistant population. In contrast, EC50s were significantly lower for populations from a TBT-contaminated estuarine site than for those from a site without TBT, suggesting that other factors in addition to TBT determine whether populations become resistant. EC50s for populations from TBT-contaminated freshwater sediments were nearly 30 times higher than those for populations from TBT-contaminated estuarine sediments. We defined a TBT-resistant bacterium as one which grows on trypticase soy agar containing 8.4 microM TBT, a concentration which prevented the growth of 90% of the culturable bacteria from these sediments. The toxicity of TBT in laboratory media was influenced markedly by the composition of the medium and whether it was liquid or solid. Ten TBT-resistant isolates from estuarine sediments and 19 from freshwater sediments were identified to the genus level. Two isolates, each a Bacillus sp., may be the first gram-positive bacteria isolated from fresh water in the presence of a high concentration of TBT. There was a high incidence of resistance to heavy metals: metal resistance indices were 0.76 for estuarine isolates and 0.68 for freshwater isolates.(ABSTRACT TRUNCATED AT 250 WORDS)
机译：在来自河口和淡水的TBT污染沉积物和未污染沉积物以及从这些沉积物分离的纯培养物中，对三丁基锡（TBT）的抗性进行了研究。在被TBT污染的淡水站点上，该群体的50％有效浓度（EC50）高于没有TBT的站点，这表明TBT被选为具有TBT抗药性的群体。相比之下，来自受TBT污染的河口站点的人群的EC50明显低于没有TBT站点的人群的EC50，这表明除TBT之外的其他因素也决定了人群是否具有抗药性。来自受TBT污染的淡水沉积物的种群的EC50比受TBT污染的河口沉积物的种群的EC50高近30倍。我们将TBT抗性细菌定义为一种在含有8.4 microM TBT的胰蛋白酶酶大豆琼脂上生长的细菌，该浓度可阻止90％的可培养细菌从这些沉积物中生长。 TBT在实验室培养基中的毒性受到培养基成分以及液体或固体的显着影响。从河口沉积物中分离出10株TBT耐药菌，从淡水沉积物中分离出19株，达到属水平。在高浓度TBT的情况下，从淡水中分离出的第一株革兰氏阳性菌可能是两种分离株，每种均为芽孢杆菌。对重金属的抗药性很高：河口分离物的金属抗性指数为0.76，淡水分离物的金属抗性指数为0.68（摘要截短为250个字）。

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