Nitrate reduction activity determined with a continuous flow-through system in sediments from a subantarctic coastal environment

Sedimentation and accumulation of autochthonous and allochthonous organic detritus in marine sediments stimulate microbial activity, consume dissolved oxygen and decrease redox potential. In anaerobic conditions, other electron acceptors are utilized in organic matter oxidation process. Nitrate redu...

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Autores principales:	Torres,Américo I, Gil,Mónica N, Esteves,José Luis
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2012
Materias:	Nitrate ammonium reactor denitrification Argentinean Patagonia
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572012000200001
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spelling	oai:scielo:S0718-195720120002000012012-11-29Nitrate reduction activity determined with a continuous flow-through system in sediments from a subantarctic coastal environmentTorres,Américo IGil,Mónica NEsteves,José Luis Nitrate ammonium reactor denitrification Argentinean Patagonia Sedimentation and accumulation of autochthonous and allochthonous organic detritus in marine sediments stimulate microbial activity, consume dissolved oxygen and decrease redox potential. In anaerobic conditions, other electron acceptors are utilized in organic matter oxidation process. Nitrate reduction is an important pathway which is related with nitrogen cycling and oxidation. The purpose of this study was to assess the nitrate reduction activity in sediments of Encerrada Bay, which is under a strong anthropogenic influence from Ushuaia city. Sediment samples were taken in September 2007 with a Van-Veen dredge and stored in darkness. Nitrate reduction activity was estimated in vitro using continuous flow-through system. Nitrate uptake rate followed a Michaelis-Menten kinetic where Km and Vmax values were equal to 1028 mM and 2.7 µmol g-1 h-1, respectively. We concluded that nitrate is used principally as terminal electron acceptor during the oxidation of organic compounds in sediment of Encerrada Bay.info:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.47 n.2 20122012-08-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572012000200001en10.4067/S0718-19572012000200001
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Nitrate ammonium reactor denitrification Argentinean Patagonia
spellingShingle	Nitrate ammonium reactor denitrification Argentinean Patagonia Torres,Américo I Gil,Mónica N Esteves,José Luis Nitrate reduction activity determined with a continuous flow-through system in sediments from a subantarctic coastal environment
description	Sedimentation and accumulation of autochthonous and allochthonous organic detritus in marine sediments stimulate microbial activity, consume dissolved oxygen and decrease redox potential. In anaerobic conditions, other electron acceptors are utilized in organic matter oxidation process. Nitrate reduction is an important pathway which is related with nitrogen cycling and oxidation. The purpose of this study was to assess the nitrate reduction activity in sediments of Encerrada Bay, which is under a strong anthropogenic influence from Ushuaia city. Sediment samples were taken in September 2007 with a Van-Veen dredge and stored in darkness. Nitrate reduction activity was estimated in vitro using continuous flow-through system. Nitrate uptake rate followed a Michaelis-Menten kinetic where Km and Vmax values were equal to 1028 mM and 2.7 µmol g-1 h-1, respectively. We concluded that nitrate is used principally as terminal electron acceptor during the oxidation of organic compounds in sediment of Encerrada Bay.
author	Torres,Américo I Gil,Mónica N Esteves,José Luis
author_facet	Torres,Américo I Gil,Mónica N Esteves,José Luis
author_sort	Torres,Américo I
title	Nitrate reduction activity determined with a continuous flow-through system in sediments from a subantarctic coastal environment
title_short	Nitrate reduction activity determined with a continuous flow-through system in sediments from a subantarctic coastal environment
title_full	Nitrate reduction activity determined with a continuous flow-through system in sediments from a subantarctic coastal environment
title_fullStr	Nitrate reduction activity determined with a continuous flow-through system in sediments from a subantarctic coastal environment
title_full_unstemmed	Nitrate reduction activity determined with a continuous flow-through system in sediments from a subantarctic coastal environment
title_sort	nitrate reduction activity determined with a continuous flow-through system in sediments from a subantarctic coastal environment
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2012
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572012000200001
work_keys_str_mv	AT torresamericoi nitratereductionactivitydeterminedwithacontinuousflowthroughsysteminsedimentsfromasubantarcticcoastalenvironment AT gilmonican nitratereductionactivitydeterminedwithacontinuousflowthroughsysteminsedimentsfromasubantarcticcoastalenvironment AT estevesjoseluis nitratereductionactivitydeterminedwithacontinuousflowthroughsysteminsedimentsfromasubantarcticcoastalenvironment
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Nitrate reduction activity determined with a continuous flow-through system in sediments from a subantarctic coastal environment

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