<?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>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2011000700009</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Baccharis Salicifolia development in the presence of high concentrations of uranium in the arid environment of San Marcos, Chihuahua]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Luna Porres]]></surname>
<given-names><![CDATA[M.Y.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alarcón Herrera]]></surname>
<given-names><![CDATA[M.T.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva Sáenz]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rentería Villalobos]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez Villa]]></surname>
<given-names><![CDATA[M.A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera Peraza]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reyes Cortés]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montero Cabrera]]></surname>
<given-names><![CDATA[M.E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Centro de Investigación en Materiales Avanzados  ]]></institution>
<addr-line><![CDATA[Chihuahua Chih]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Autónoma de Chihuahua Facultad de Ingeniería ]]></institution>
<addr-line><![CDATA[Chihuahua Chih]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2011</year>
</pub-date>
<volume>57</volume>
<fpage>40</fpage>
<lpage>43</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2011000700009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2011000700009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2011000700009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[In humid zones and marine environments the bioindicator contaminants by trace elements are well established. However, in arid zones it is more difficult to find these tools because there is less biodiversity. The objective of this paper was to analyze the behavior of the Baccharis salicifolia plant in areas with high uranium concentration in arid zones, to determine the characteristics of tolerance and possible use as a biomonitor for the presence of such contaminants. For this project a uraniferous zone was selected in San Marcos, located northwest of the City of Chihuahua. A total of 8 sampling points of the plant and soil were located here. Each sample was divided into the root and the stem and leaves to determine the specific activity of the uranium in both parts of the plant and its sediments. The determination of the specific activities of the total uranium in the samples was obtained by liquid scintillation with alpha-beta separation. The results indicate a tendency for the plant to accumulate the uranium in its different parts, and to translocate it to its stem and leaves. The plant is resistant to high concentrations of uranium, not showing any specific changes in relation to non - contaminated areas that might indicate the presence of the contaminant. Therefore, its use as a biomonitor species is limited.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[En zonas húmedas y ambientes marinos están bien establecidos los bioindicadores de contaminación por elementos trazas. Sin embargo, en zonas áridas es más difícil encontrar estas herramientas, debido a que la biodiversidad es menor. El objetivo del presente trabajo fue analizar el comportamiento de la planta Baccharis salicifolia en sitios con altas concentraciones de uranio en zonas áridas para determinar sus características de tolerancia y posible uso como biomonitor de la presencia dicho contaminante. Para dicho estudio se selecciono la zona uranífera de San Marcos, ubicada al noroeste de la ciudad de Chihuahua. Aquí se ubicaron 8 puntos de muestreo de la planta y suelo adyacente a la misma. Cada muestra fue seccionada en raíz y parte aérea, determinándose la actividad específica de uranio en ambas secciones de la planta y sedimentos. La determinación de las actividades específicas de uranio total en las muestras se realizo con un equipo de detección de centelleo líquido con separación alfabeta. Los resultados indican una tendencia de la planta a acumular el uranio en sus diferentes partes, y a traslocarlo a la parte aérea de la planta. La planta es resistente a altas concentraciones de uranio, pero no muestra ningún efecto o cambio con respecto a sitios no contaminados que pueda indicar la presencia del contaminante, por lo que su uso como especie biomonitora es limitado.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Biomonitor]]></kwd>
<kwd lng="en"><![CDATA[uranium]]></kwd>
<kwd lng="en"><![CDATA[Baccharis Salicifolia]]></kwd>
<kwd lng="es"><![CDATA[Biomonitor]]></kwd>
<kwd lng="es"><![CDATA[uranio]]></kwd>
<kwd lng="es"><![CDATA[Baccharis Salicifolia]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><font face="verdana" size="4"><b>Baccharis Salicifolia development in the presence of high concentrations of uranium in the arid environment of San Marcos, Chihuahua</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>M.Y. Luna Porres<sup>a</sup>, M.T. Alarc&oacute;n Herrera<sup>a</sup>, M. Silva S&aacute;enz<sup>a</sup>, M. Renter&iacute;a Villalobos<sup>a</sup>, M.A. Rodr&iacute;guez Villa<sup>a</sup>, E. Herrera Peraza<sup>a</sup>, M. Reyes Cort&eacute;s<sup>a,b</sup>, and M.E. Montero Cabrera<sup>a, *</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><sup>a</sup> <i>Centro de Investigaci&oacute;n en Materiales Avanzados, S.C., Miguel de Cervantes 120, Complejo Ind. Chihuahua, Chihuahua,     <em>Chih.</em>, M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2"><sup>b</sup> <i>Facultad de Ingenier&iacute;a, Universidad Aut&oacute;noma de Chihuahua, Nuevo Campus, Chihuahua, Chih. M&eacute;xico, *</i> e&#150;mail: <a href="mailto:elena.montero@cimav.edu.mx">elena.montero@cimav.edu.mx</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 10 de marzo de 2010    <br> Aceptado el 31 de agosto de 2010</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">In humid zones and marine environments the bioindicator contaminants by trace elements are well established. However, in arid zones it is more difficult to find these tools because there is less biodiversity. The objective of this paper was to analyze the behavior of the <i>Baccharis salicifolia </i>plant in areas with high uranium concentration in arid zones, to determine the characteristics of tolerance and possible use as a biomonitor for the presence of such contaminants. For this project a uraniferous zone was selected in San Marcos, located northwest of the City of Chihuahua. A total of 8 sampling points of the plant and soil were located here. Each sample was divided into the root and the stem and leaves to determine the specific activity of the uranium in both parts of the plant and its sediments. The determination of the specific activities of the total uranium in the samples was obtained by liquid scintillation with alpha&#150;beta separation. The results indicate a tendency for the plant to accumulate the uranium in its different parts, and to translocate it to its stem and leaves. The plant is resistant to high concentrations of uranium, not showing any specific changes in relation to non &#150; contaminated areas that might indicate the presence of the contaminant. Therefore, its use as a biomonitor species is limited.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords:  </b>Biomonitor; uranium; Baccharis Salicifolia.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resuemen</b></font></p>     <p align="justify"><font face="verdana" size="2">En zonas h&uacute;medas y ambientes marinos est&aacute;n bien establecidos los bioindicadores de contaminaci&oacute;n por elementos trazas. Sin embargo, en zonas &aacute;ridas es m&aacute;s dif&iacute;cil encontrar estas herramientas, debido a que la biodiversidad es menor. El objetivo del presente trabajo fue analizar el comportamiento de la planta <i>Baccharis salicifolia </i>en sitios con altas concentraciones de uranio en zonas &aacute;ridas para determinar sus caracter&iacute;sticas de tolerancia y posible uso como biomonitor de la presencia dicho contaminante. Para dicho estudio se selecciono la zona uran&iacute;fera de San Marcos, ubicada al noroeste de la ciudad de Chihuahua. Aqu&iacute; se ubicaron 8 puntos de muestreo de la planta y suelo adyacente a la misma. Cada muestra fue seccionada en ra&iacute;z y parte a&eacute;rea, determin&aacute;ndose la actividad espec&iacute;fica de uranio en ambas secciones de la planta y sedimentos. La determinaci&oacute;n de las actividades espec&iacute;ficas de uranio total en las muestras se realizo con un equipo de detecci&oacute;n de centelleo l&iacute;quido con separaci&oacute;n alfabeta. Los resultados indican una tendencia de la planta a acumular el uranio en sus diferentes partes, y a traslocarlo a la parte a&eacute;rea de la planta. La planta es resistente a altas concentraciones de uranio, pero no muestra ning&uacute;n efecto o cambio con respecto a sitios no contaminados que pueda indicar la presencia del contaminante, por lo que su uso como especie biomonitora es limitado.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Biomonitor; uranio; Baccharis Salicifolia.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 91.62.Rt; 89.60.&#150;k</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"> <a href="/pdf/rmf/v57s1/v57s1a9.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a>  </font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Acknowledgements</b></font></p>     <p align="justify"><font face="verdana" size="2">This research has been partially supported by SEP&#150;CONACYT Project 26040 and Fondos Mixtos CONACYT &#150;Gobierno del Estado de Chihuahua Project CHIH&#150;2008&#150;C02&#150;91931.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. M. Renter&iacute;a Villalobos <i>et al., Revista Mexicana de F&iacute;sica </i><b>S53 </b>(2007) 16.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8374877&pid=S0035-001X201100070000900001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">2. M. Reyes&#150;Cortes <i>et al., Revista Mexicana de F&iacute;sica </i><b>S53 </b>(2007) 23.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8374879&pid=S0035-001X201100070000900002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     ]]></body>
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