Enhanced Biodegradation of - and -Hexachlorocyclo
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- 作者：Manish Kumar ; Pankaj Chaudhary ; Manish Dwivedi ; Ranjan Kumar ; Debarati Paul ; Rakesh K. Jain ; Satyendra K. Garg ; and Ashwani Kumar
- 刊名：Environmental Science & Technology
- 出版年：2005
- 出版时间：June 1, 2005
- 年：2005
- 卷：39
- 期：11
- 页码：4005 - 4011
- 全文大小：164K
- 年卷期：v.39,no.11(June 1, 2005)
- ISSN：1520-5851
文摘
The chlorinated insecticide hexachlorocyclohexane (HCH)has been used extensively in the past, and contaminatedsites are present throughout the world. Toward theirbioremediation, we isolated a bacterium Pseudomonasaeruginosa ITRC-5 that mediates the degradation of all thefour major isomers of HCH under aerobic conditions,both in liquid-culture and contaminated soils. In liquid-culture, the degradation of 
- and 
-HCH is rapid and isaccompanied with the release of 5.6 
mole chloride ions and4.1 mole CO2 mole-1 HCH-isomer. The degradation of
- and 
-isomers is slow, accompanied with the release of0.9 mole chloride ions mole-1 HCH-isomer, and resultsin a transient metabolite 2,3,4,5,6-pentachlorocyclohexan-1-ol. The strain ITRC-5 also mediates the degradation of-, -, -, and -isomers in contaminated soils, wheredegradation of otherwise persistent - and -HCH is enhancedseveralfold in the presence of - or -HCH. The degradationof soil-applied - and -HCH under aerobic conditionshas not been reported earlier. The isolate ITRC-5 thereforedemonstrates potential for the bioremediation of HCH-wastes and contaminated soils.
- and -HCH is rapid and isaccompanied with the release of 5.6 mole chloride ions and4.1 mole CO2 mole-1 HCH-isomer. The degradation of- and -isomers is slow, accompanied with the release of0.9 mole chloride ions mole-1 HCH-isomer, and resultsin a transient metabolite 2,3,4,5,6-pentachlorocyclohexan-1-ol. The strain ITRC-5 also mediates the degradation of-, -, -, and -isomers in contaminated soils, wheredegradation of otherwise persistent - and -HCH is enhancedseveralfold in the presence of - or -HCH. The degradationof soil-applied - and -HCH under aerobic conditionshas not been reported earlier. The isolate ITRC-5 thereforedemonstrates potential for the bioremediation of HCH-wastes and contaminated soils.