Removal of heavy metals by exopolymeric substances produced by resistant purple nonsulfur bacteria isolated from contaminated shrimp ponds

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 conditio...

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Autores principales:	Panwichian,Saijai, Kantachote,Duangporn, Wittayaweerasak,Banjong, Mallavarapu,Megharaj
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso 2011
Materias:	contamination exopolymeric substances heavy metals photosynthetic bacteria shrimp farming
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000400002
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spelling	oai:scielo:S0717-345820110004000022012-04-17Removal of heavy metals by exopolymeric substances produced by resistant purple nonsulfur bacteria isolated from contaminated shrimp pondsPanwichian,SaijaiKantachote,DuangpornWittayaweerasak,BanjongMallavarapu,Megharaj contamination exopolymeric substances heavy metals photosynthetic bacteria shrimp farming 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).info:eu-repo/semantics/openAccessPontificia Universidad Católica de ValparaísoElectronic Journal of Biotechnology v.14 n.4 20112011-07-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000400002en
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	contamination exopolymeric substances heavy metals photosynthetic bacteria shrimp farming
spellingShingle	contamination exopolymeric substances heavy metals photosynthetic bacteria shrimp farming Panwichian,Saijai Kantachote,Duangporn Wittayaweerasak,Banjong Mallavarapu,Megharaj Removal of heavy metals by exopolymeric substances produced by resistant purple nonsulfur bacteria isolated from contaminated shrimp ponds
description	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).
author	Panwichian,Saijai Kantachote,Duangporn Wittayaweerasak,Banjong Mallavarapu,Megharaj
author_facet	Panwichian,Saijai Kantachote,Duangporn Wittayaweerasak,Banjong Mallavarapu,Megharaj
author_sort	Panwichian,Saijai
title	Removal of heavy metals by exopolymeric substances produced by resistant purple nonsulfur bacteria isolated from contaminated shrimp ponds
title_short	Removal of heavy metals by exopolymeric substances produced by resistant purple nonsulfur bacteria isolated from contaminated shrimp ponds
title_full	Removal of heavy metals by exopolymeric substances produced by resistant purple nonsulfur bacteria isolated from contaminated shrimp ponds
title_fullStr	Removal of heavy metals by exopolymeric substances produced by resistant purple nonsulfur bacteria isolated from contaminated shrimp ponds
title_full_unstemmed	Removal of heavy metals by exopolymeric substances produced by resistant purple nonsulfur bacteria isolated from contaminated shrimp ponds
title_sort	removal of heavy metals by exopolymeric substances produced by resistant purple nonsulfur bacteria isolated from contaminated shrimp ponds
publisher	Pontificia Universidad Católica de Valparaíso
publishDate	2011
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000400002
work_keys_str_mv	AT panwichiansaijai removalofheavymetalsbyexopolymericsubstancesproducedbyresistantpurplenonsulfurbacteriaisolatedfromcontaminatedshrimpponds AT kantachoteduangporn removalofheavymetalsbyexopolymericsubstancesproducedbyresistantpurplenonsulfurbacteriaisolatedfromcontaminatedshrimpponds AT wittayaweerasakbanjong removalofheavymetalsbyexopolymericsubstancesproducedbyresistantpurplenonsulfurbacteriaisolatedfromcontaminatedshrimpponds AT mallavarapumegharaj removalofheavymetalsbyexopolymericsubstancesproducedbyresistantpurplenonsulfurbacteriaisolatedfromcontaminatedshrimpponds
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Removal of heavy metals by exopolymeric substances produced by resistant purple nonsulfur bacteria isolated from contaminated shrimp ponds

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