Notice of RetractionIsolation and Properties of Cypermethrin-Degrading Acinetobacter junii ML9

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

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This work presents laboratory studies on a cypermethrin-degrading bacterium Acinetobacter junii ML9. This strain was isolated from the sewage of a pesticide factory outlet and was identified by Biolog Microplate Identification System. The degradation of cypermethrin was determined quantitatively by high performance liquid chromatography (HPLC). The effects of environmental factors including carbon sources, initial pH, medium volume, incubating temperature and substrate concentration on the degradation rate were investigated. ML9 showed the best growth rate and cypermethrin-degrading activity when it was incubated in nutrient broth medium. Cypermethrin was liable to degradation under alkaline condition, giving degradation half-times of 20.8 days (tap water) and 16.1 days (sterile nutrient broth) at pH 9.0. However, ML9 showed highest degradation activity at the range of neutral pH value. The degradation half-life times of cypermethrin in the culture liquid of ML9 were only 4.1, 3.2 and 4.3 days at pH 9.0, 7.0 and 5.0, respectively. In addition, lambda-cyhalothrin and triazophos could also be degraded by ML9, showing that ML9 was a broad-spectrum pesticide-degrading bacterium. Application of ML9 on eliminating pesticide in vegetable showed that 43.1% of cypermethrin was removed after treatment for 48 h, which indicated that it may provide a potent application in detergent industry and environmental restoration.