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Environ Sci Pollut Res Int

Title:		Differences between 4-fluoroaniline degradation and autoinducer release by Acinetobacter sp. TW: implications for operating conditions in bacterial bioaugmentation
Author(s):		Wang M; Xu J; Wang J; Wang S; Feng H; Shentu J; Shen D;
Address:		"College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310012, China. wmzyy@163.com"
Journal Title:		Environ Sci Pollut Res Int
Year:		2013
Volume:		20130416
Issue:		9
Page Number:		6201 - 6209
DOI:		10.1007/s11356-013-1660-7
ISSN/ISBN:		1614-7499 (Electronic) 0944-1344 (Linking)
Abstract:		"To develop a bacterial bioaugmentation system for fluorine-containing industrial wastewater treatment, optimal conditions for 4-fluoroaniline (4-FA) degradation and autoinducer release in Acinetobacter sp. TW were determined. Quorum sensing in biofilms of strain TW was also investigated. Different optimal conditions exist for 4-FA degradation and autoinducer release, particularly with regard to pH. Quorum sensing modulates extracellular polymeric substance (EPS) secretion and biofilm formation in the strain but plays no role in 4-FA degradation. Under optimal conditions for 4-FA degradation, the release of N-3-oxo-hexanoyl-homoserine lactone (3-oxo-C6-HSL) and N-hexanoyl-homoserine lactone (C6-HSL) in strain TW was significantly lower than required for quorum sensing. Under optimal conditions for autoinducer release, on the other hand, 3-oxo-C6-HSL and C6-HSL levels exceeded the quorum sensing thresholds, thereby inducing EPS secretion and biofilm formation. We conclude that the optimal conditions for autoinducer release (25 degrees C, pH 5, 800 mg L(-1) 4-FA, and 0 % NaCl) are suitable for bacterial colonization in bioaugmentation, while those for 4-FA degradation (25-30 degrees C, pH 8 and 800 mg L(-1) 4-FA) maximize the system performance after colonization"
Keywords:		"Acinetobacter/genetics/*metabolism Aniline Compounds/*chemistry Biodegradation, Environmental Biofilms Gene Expression Regulation, Bacterial Movement Pheromones/chemistry/*metabolism beta-Galactosidase/genetics/metabolism;"
Notes:		"MedlineWang, Meizhen Xu, Junjie Wang, Juehua Wang, Shuo Feng, Huajun Shentu, Jiali Shen, Dongsheng eng Research Support, Non-U.S. Gov't Germany 2013/04/17 Environ Sci Pollut Res Int. 2013 Sep; 20(9):6201-9. doi: 10.1007/s11356-013-1660-7. Epub 2013 Apr 16"