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Bioremediation of Microcystins by Two Native Bacteria; Bacillus Cereus and Rahnella Aquatilis

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dc.contributor.author Idroos, E.S.
dc.contributor.author Manage, P.M.
dc.date.accessioned 2018-05-22T06:50:27Z
dc.date.available 2018-05-22T06:50:27Z
dc.date.issued 2018
dc.identifier.citation Idroos, E.S., Manage, P.M. (2018). "Bioremediation of Microcystins by Two Native Bacteria; Bacillus Cereus and Rahnella Aquatilis", Asian Journal of Microbiology, Biotechnology & Environmental Sciences, Vol. 20 (3), pp. 24-32 en_US, si_LK
dc.identifier.issn 0972-3005
dc.identifier.uri http://dr.lib.sjp.ac.lk/handle/123456789/6982
dc.description.abstract Attached en_US, si_LK
dc.description.abstract Microcystins (MCs) are a group of cyclic heptapeptide hepatotoxins produced by cyanobacteria. Among 70 analogues of MCs, Microcystin-LR (MC-LR) is the dominant type in Sri Lankan water bodies. Contamination of MC-LR in drinking water is a serious health issue. Thus, the present study was carried out to identify freshwater bacteria, which are capable of degrading MC-LR. BIOLOG MT2 plate assay was employed to confirm MC-LR biodegradation by the bacterium Bacillus cereus and Rahnella aquatilis which were isolated from Girandurukotte reservoir and form Ulhitiya reservoir respectively. Classic batch culture experiments showed that B. cereus and R. aquatilis removed 100% of MC-LR at 28o C within 8 and 10 days of incubation respectively. Optimized biodegradation conditions for MC-LR by B. cereus and R. aquatilis were recorded at 320 C when phosphates and nitrate concentrations were 0.01ppm and 0.4 ppm respectively in experimental medium. Moreover, B. cereus andR. aquatilis were capable of degrading other MCs analogues; Microcystin-LF (MC-LF), Microcystin –LW (MC-LW), Microcystin –RR (MC-RR) and nodularin (NOD) as well. Molecular studies confirmed that B. cereus and R. aquatilis harbored MC degrading mlrA, mlrB, mlrC and mlrD genes. This is the first record for degradation of MCs and NOD by R. aquatilis.
dc.language.iso en_US en_US, si_LK
dc.publisher Asian Journal of Microbiology, Biotechnology & Environmental Sciences en_US, si_LK
dc.subject Biodegradation en_US, si_LK
dc.subject Microcystin-LR en_US, si_LK
dc.subject BIOLOG MT2 plates en_US, si_LK
dc.subject B. cereus en_US, si_LK
dc.subject R. aquatilis en_US, si_LK
dc.title Bioremediation of Microcystins by Two Native Bacteria; Bacillus Cereus and Rahnella Aquatilis en_US, si_LK
dc.type Article en_US, si_LK


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