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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Jul 2014, 35 (4)                                                                                                             Back

nstantaneous and historical temperature effects on a-pinene

Heavy metal tolerant halophilic bacteria from Vembanad Lake as possible source for bioremediation of lead and cadmium


M. Sowmya1, M.P. Rejula1, P.G. Rejith1, Mahesh Mohan1, Makesh Karuppiah2 and A.A. Mohamed Hatha3*

1School of Environmental Sciences, Mahatma Gandhi University, Kottayam-686 560, India

2Environmental Sciences Division, EnviroApps Inc, Orlando, FL 32835, USA

3Department of Marine Biology, Microbiology and Biochemistry, Cochin University of Science and Technology, Cochin 682 016, India

*Corresponding Author E-mail:




Publication Data

Paper received:

26 December 2012


Revised received:

08 June 2013



31 July 2013



Microorganisms which can resist high concentration of toxic heavy metals are often considered as effective tools of bioremediation from such pollutants. In the present study, sediment samples from Vembanad Lake were screened for the presence of halophilic bacteria that are tolerant to heavy metals. A total of 35 bacterial strains belonging to different genera such as Alcaligenes, Vibrio, Kurthia, Staphylococcus and members of the family Enterobacteriaceae were isolated from 21 sediment samples during February to April, 2008. The salt tolerance and optimum salt concentrations of the isolates revealed that most of them were moderate halophiles followed by halotolerant and extremely halotolerant groups. The minimum inhibitory concentrations (MICs) against cadmium and lead for each isolate revealed that the isolates showed higher MIC against lead than cadmium. Based on the resistance limit concentration, most of them were more tolerant to lead than cadmium at all the three salt concentrations tested. Heavy metal removal efficiency of selected isolates showed a maximum reduction of 37 and 99% against cadmium and lead respectively. The study reveals the future prospects of halophilic microorganisms in the field of bioremediation. 


 Key words


Bioremediation, Halophilic bacteria, Heavy metal tolerance, Sediment, Vembanad lake



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