<?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>S0188-49992022000100103</article-id>
<article-id pub-id-type="doi">10.20937/rica.54088</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[ANAMMOX MICROBIAL ACTIVITY IN SODIUM SALINE SOIL OF FORMER LAKE TEXCOCO, MEXICO]]></article-title>
<article-title xml:lang="es"><![CDATA[ACTIVIDAD MICROBIANA TIPO ANAMMOX EN SUELO SALINO-SÓDICO DEL ANTIGUO LAGO DE TEXCOCO, MÉXICO]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Oropeza]]></surname>
<given-names><![CDATA[Marcelo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández]]></surname>
<given-names><![CDATA[Francisco José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Caudan]]></surname>
<given-names><![CDATA[Cedric]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cabirol]]></surname>
<given-names><![CDATA[Nathalie]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias Departamento Ecología y Recursos Naturales]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma Metropolitana-Unidad Iztapalapa  ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<volume>38</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992022000100103&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992022000100103&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992022000100103&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The Anammox process, involving transformation of ammonium to dinitrogen, is well known in aquatic ecosystems. However, this anaerobic process in soil has been little explored, even less in extremophile soils. The saline-sodic soil of the former Lake Texcoco exposed to desertification with irrigation projects using wastewater of Mexico City, is a unique environment, yet little is known about its microbial ecology. The objective of this study was to examine the presence of Anammox microorganisms and their microcosm activity after a period of Anammox enrichment (229 days). Microcosm kinetics monitored after the 229 days enrichment experiment, showed a significant removal of ammonium and nitrite, with a significant production of dinitrogen. The stoichiometric conversion of NO2 - and NH4 + to N2 gas is complete in the studied soils, based on an Anammox process where 1 mole of NH4 + resulted in 1.02 moles of N2. The presence of the Anammox functional gene hzoA was observed in saline-sodic soils of the former Lake Texcoco. The Anamx1 and Anamx2 operational taxonomic units (OTU) are phylogenetically close to a bacterium of the phylum Planctomycetes from a wastewater treatment reactor and marine environment (AB257585.1 and HE654780.1, respectively). Those two OTU represent indigenous or exogenous Anammox microorganisms phylotypes. The existence of microorganisms with Anammox activity in a saline-sodic alkaline soil is of great interest for the understanding of the nitrogen cycle in extremophile soils.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El proceso Anammox, que implica la transformación de amonio en dinitrógeno, es bien conocido en los ecosistemas acuáticos; sin embargo, este proceso anaeróbico en el suelo ha sido poco explorado, y menos aún en suelos extremófilos. El suelo salino sódico del antiguo lago de Texcoco, expuesto a la desertización, con proyectos de riego que utilizan aguas residuales de la Ciudad de México, es un entorno único, pero poco se sabe de su ecología microbiana. El objetivo de este estudio fue examinar la presencia de microorganismos Anammox y su actividad de microcosmos tras un periodo de enriquecimiento (229 días). La cinética de microcosmos, la cual fue monitorizada después del experimento de enriquecimiento de 229 días, mostró eliminación significativa de amonio y nitrito con producción significativa de dinitrógeno. La conversión estequiométrica de NO2 - y NH4 + a gas N2 fue completa en los suelos estudiados, con base en el proceso Anammox donde 1 mole de NH4 + resultó en 1.02 moles de N2. Se observó la presencia del gen funcional Anammox hzoA en suelos del antiguo lago salino sódico de Texcoco. Las unidades taxonómicas operativas (OTU, por su sigla en inglés) Anamx1 y Anamx 2 son filogenéticamente cercanos a cepas de una bacteria del filo Planctomycetes procedentes de un reactor de tratamiento de aguas residuales y de un medio ambiente marino (AB257585.1 y HE654780.1, respectivamente). Esas dos OTU representan los filotipos autóctonos o exógenos de microorganismos Anammox. La existencia de microorganismos con actividad Anammox en un suelo alcalino salino sódico es de gran interés para entender el ciclo del nitrógeno en suelos extremófilos.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[alkaline]]></kwd>
<kwd lng="en"><![CDATA[Anammox activity]]></kwd>
<kwd lng="en"><![CDATA[extremophile]]></kwd>
<kwd lng="en"><![CDATA[hzoA gene]]></kwd>
<kwd lng="en"><![CDATA[microcosm]]></kwd>
<kwd lng="en"><![CDATA[saline-sodic soil]]></kwd>
<kwd lng="es"><![CDATA[actividad de Anammox]]></kwd>
<kwd lng="es"><![CDATA[alcalino]]></kwd>
<kwd lng="es"><![CDATA[extremófilo]]></kwd>
<kwd lng="es"><![CDATA[gen hzoA]]></kwd>
<kwd lng="es"><![CDATA[microcosmos]]></kwd>
<kwd lng="es"><![CDATA[suelo salino sódico]]></kwd>
</kwd-group>
</article-meta>
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