Removal of heavy metals by exopolymeric substances produced by resistant purple nonsulfur bacteria isolated from contaminated shrimp ponds
Título del documento: Removal of heavy metals by exopolymeric substances produced by resistant purple nonsulfur bacteria isolated from contaminated shrimp ponds
Revista: Electronic journal of biotechnology
Base de datos: PERIÓDICA
Número de sistema: 000358099
ISSN: 0717-3458
Autores: 1
1
2
3
Instituciones: 1Prince of Songkla University, Faculty of Science, Hat-Yai, Songkhla. Tailandia
2Prince of Songkla University, National Center of Excellence for Environmental and Hazardous Waste Management, Hat-Yai, Songkhla. Tailandia
3University of South Australia, Center for Environmental Risk Assessment and Remediation, Mawson Lakes, South Australia. Australia
Año:
Volumen: 14
Número: 4
País: Chile
Idioma: Inglés
Tipo de documento: Artículo
Enfoque: Experimental, aplicado
Resumen en inglés Two purple nonsulfur bacteria (PNSB) strains, Rhodobium marinum NW16 and Rhodobacter sphaeroides KMS24 were investigated for their potential to remove heavy metals (HMs) from contaminated shrimp pond water. Tolerance of both PNSB strains growing with both microaerobic-light and aerobic-dark conditions, based on their minimum inhibitory concentrations, was in the order of Cu2+ > Zn2+ > Cd2+ (Pb precipitation occurred at 0.34 mM). Results from a scanning electron microscope equipped with an energy dispersive X-ray spectrometer (SEM-EDX) indicated that Cu2+ and Zn2+ altered the cellular morphology of both strains and accumulated HMs were found in their cells. The highest amounts of both cations were found in their cell walls followed by the cytoplasm and cell membrane. Using the highest concentrations (mM) of HMs found in shrimp pond of 0.0067 Cd2+, 0.54 Cu2+, 0.30 Pb2+, 0.89 Zn2+ and 3% NaCl under both incubating conditions exopolymeric substances (EPS) produced by both strains showed a greater removal of all HMs (average percentages; 90.52-97.29) than their cells (average percentages; 14.02-75.03)
Disciplinas: Biología
Palabras clave: Biotecnología,
Biorremediación,
Estanques de cultivo,
Metales pesados,
Bacterias fotosintéticas,
Exopolímeros,
Cultivo de camarón
Keyword: Biology,
Biotechnology,
Bioremediation,
Culture ponds,
Heavy metals,
Photosynthetic bacteria,
Exopolymers,
Shrimp culture
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