<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0188-4999</journal-id>
<journal-title><![CDATA[Revista internacional de contaminación ambiental]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Int. Contam. Ambient]]></abbrev-journal-title>
<issn>0188-4999</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias de la Atmósfera y Cambio Climático]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-49992019000100259</article-id>
<article-id pub-id-type="doi">10.20937/rica.2019.35.01.19</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[BIOSORPTION OF CADMIUM AND LEAD USING SUSPENDED AND IMMOBILIZED Enterobacter cloacae AT DIFFERENT pH]]></article-title>
<article-title xml:lang="es"><![CDATA[BIOADSORCIÓN DE CADMIO Y PLOMO USANDO Enterobacter cloacae SUSPENDIDOS E INMOBILIZADOS A DIFERENTES pH]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bojórquez]]></surname>
<given-names><![CDATA[Carolina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Frías-Espericueta]]></surname>
<given-names><![CDATA[Martín Gabriel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez-Gil]]></surname>
<given-names><![CDATA[Bruno]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Voltolina]]></surname>
<given-names><![CDATA[Domenico]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Sinaloa Facultad de Ciencias del Mar Posgrado en Ciencias en Recursos Acuáticos]]></institution>
<addr-line><![CDATA[Mazatlán Sinaloa]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Politécnica de Sinaloa Unidad Académica de Ingeniería en Tecnología Ambiental ]]></institution>
<addr-line><![CDATA[Mazatlán Sinaloa]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Sinaloa Facultad de Ciencias del Mar ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Centro de Investigación en Alimentación y Desarrollo, Unidad Mazatlán  ]]></institution>
<addr-line><![CDATA[Mazatlán Sinaloa]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad Autónoma de Sinaloa Facultad de Ciencias del Mar Centro de Investigaciones Biológicas del Noroeste, Laboratorio UAS-CIBNOR]]></institution>
<addr-line><![CDATA[Mazatlán Sinaloa]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<volume>35</volume>
<numero>1</numero>
<fpage>259</fpage>
<lpage>264</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992019000100259&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992019000100259&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992019000100259&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The aim of this work was to determine the best conditions for biomass production of the bacterium Enterobacter cloacae and for Cd and Pb retention by adsorption on the cell walls or by absorption and accumulation in the bacterial biomass. Suspended and immobilized cultures of this bacterium, acclimated to both metals, were grown for 24 h at pH 6, 7 and 9, in trypticase soy (TS) medium added with 2.73 mg/L of Cd or 16.8 mg/L of Pb. Immobilized cultures at pH 7 and 9 had the highest biomass production. Percentages of Cd retention by adsorption and absorption increased with increasing pH, but adsorption was higher in suspended while absorption was higher in immobilized cultures. Possibly because of different affinity of bacterial cells for these metals, the percentages of Pb retention were higher than those of Cd. In percentage, the highest Pb adsorption on cell walls was at pH 9, while retention by biomass decreased with increasing pH. The amount of metal retained by one g of bacterial biomass, efficiency was higher at pH 6, possibly because of the presence of dead or dying bacterial cells.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN En este trabajo se determinaron las mejores condiciones para la producción de biomasa y para la retención de Cd y Pb por adsorción en las paredes celulares o por absorción y acumulación en la biomasa bacteriana de Enterobacter cloacae. Con esta finalidad, se mantuvieron durante 24 h a pH 6, 7 y 9 cultivos suspendidos e inmovilizados de esta bacteria aclimatada a los dos metales, en medio tripticasa de soya (TS) adicionado con 2.73 mg/L de Cd o 16.8 mg/L de Pb. La mayor producción de biomasa se obtuvo con los cultivos inmovilizados a pH 7 y 9. Los porcentajes de adsorción y absorción de Cd aumentaron con el incremento del pH, pero la adsorción resultó mayor en los cultivos libres, mientras que la absorción fue mayor en los inmovilizados. Los porcentajes de retención de Pb fueron mayores que los determinados para Cd, posiblemente debido a diferencias en la afinidad de estos metales para las células bacterianas. La mayor adsorción de Pb en las paredes celulares fue con pH 9, mientras que la retención en la biomasa disminuyó con el incremento del pH. En términos de cantidad de metal retenido por un gramo de biomasa bacteriana, la eficiencia de retención fue mayor a pH 6, posiblemente debido a la presencia de células muertas o poco viables.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[metals]]></kwd>
<kwd lng="en"><![CDATA[bacterial cultures]]></kwd>
<kwd lng="en"><![CDATA[absorption]]></kwd>
<kwd lng="en"><![CDATA[adsorption]]></kwd>
<kwd lng="en"><![CDATA[biomass production]]></kwd>
<kwd lng="es"><![CDATA[metales]]></kwd>
<kwd lng="es"><![CDATA[cultivo bacteriano]]></kwd>
<kwd lng="es"><![CDATA[absorción]]></kwd>
<kwd lng="es"><![CDATA[adsorción]]></kwd>
<kwd lng="es"><![CDATA[producción de biomasa]]></kwd>
</kwd-group>
</article-meta>
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