<?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>0120-5552</journal-id>
<journal-title><![CDATA[Revista Salud Uninorte]]></journal-title>
<abbrev-journal-title><![CDATA[Salud, Barranquilla]]></abbrev-journal-title>
<issn>0120-5552</issn>
<publisher>
<publisher-name><![CDATA[Fundación Universidad del Norte, División de Ciencias de la]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-55522013000300001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Modelización molecular de las interacciones de 9-aminoacridinas con ácidos nucleicos]]></article-title>
<article-title xml:lang="en"><![CDATA[Molecular modeling of the 9-aminoacridines interactions with nucleic acids]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cotes Oyaga]]></surname>
<given-names><![CDATA[Sandra]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cotuá Valdés]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Borja Páez]]></surname>
<given-names><![CDATA[Sigrid]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hurtado Márquez]]></surname>
<given-names><![CDATA[Keylin]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A">
<institution><![CDATA[,  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>01</day>
<month>09</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>01</day>
<month>09</month>
<year>2013</year>
</pub-date>
<volume>29</volume>
<numero>3</numero>
<fpage>351</fpage>
<lpage>359</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-55522013000300001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-55522013000300001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-55522013000300001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Objetivos: Calcular por medio de la modelización molecular descriptores moleculares para un grupo de 9-aminoacridinas (9-AA 2 a-e) de actividad biológica comprobada, los pares de bases Adenina-Timina (AT) y Guanina-Citosina (GC) y sus respectivos complejos. Materiales y métodos: Las geometrías moleculares de las 9-AA2 a-e y las bases nitrogenadas del ADNfueron optimizados usando el método DFT B3LYP/6-31G**. Las propiedades de las 9-AA 2 a-e aisladas y sus interacciones más estables con AT y GC fueron investigadas usando el mismo método. Resultados: Los resultados mostraron que las 9-AA 2 a-e presentan gran deslocalización de cargas, altas polarizabilidades y altos momentos dipolares, los cuales son propiedades determinantes para estudios de interacciones intermoleculares. Las 9-AA 2 a-e son aceptores de electrones, mientras que los pares de bases son donadores de electrones. Conclusiones: Del conjunto de 9-AA estudiadas, la 9-AA 2(d) presenta las mayores atracciones intermoleculares con los pares de bases del ADN, y la 9-AA 2(b) las más débiles.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Objectives: To calculate a set of molecular descriptors of a group of 9-aminoacridines (9-AA 2 a-e), of DNA base pairs adenine-thymine (AT) and guanine-cytosine (GC) and their respective complexes. Materials and Methods: Molecular geometries of 9-AA 2 a-e and DNA base pairs were optimized using the DFT B3LYP/6-31G ** method. The properties of the isolated 9-AA 2 a-e and stable interactions with AT and GC were studied using the same method. Results: The results showed that 9-AA 2 a-e have large charges, high dipole moments and high polarizabilities, properties which are decisive for intermolecular interaction studies. 9-AA 2 a-e are electron acceptors while base pairs are electron donors. Conclusions: 9-AA 2(d) showed the strongest intermolecular interactions with DNA base pairs and 9-AA 2(b) the weakest.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[ADN]]></kwd>
<kwd lng="es"><![CDATA[9-Aminoacridinas]]></kwd>
<kwd lng="es"><![CDATA[cálculos DFT]]></kwd>
<kwd lng="en"><![CDATA[DNA]]></kwd>
<kwd lng="en"><![CDATA[9-Aminoacridines]]></kwd>
<kwd lng="en"><![CDATA[DFT calculations]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <font face="verdana" size="2">     <p><b>Art&iacute;culo original /</b> <i>ORIGINAL ARTICLE</i></p> <font size="4">    <p align="center"><b>Modelizaci&oacute;n molecular de las interacciones de 9-aminoacridinas con &aacute;cidos nucleicos</b></p></font> <font size="3">    <p align="center">Molecular modeling of the 9-aminoacridines interactions with nucleic acids</b></p></font>     <p>Sandra Cotes Oyaga<a name="n1"></a><a href="#n_1"><sup>1</sup></a>, Jos&eacute; Cotu&aacute; Vald&eacute;s<a name="n2"></a><a href="#n_2"><sup>2</sup></a>, Sigrid Borja P&aacute;ez<a name="n2"></a><a href="#n_2"><sup>2</sup></a>, Keylin Hurtado M&aacute;rquez<a name="n2"></a><a href="#n_2"><sup>2</sup></a></p> <b>Correspondencia: </b>Sandra Cotes Oyaga. Departamento de Qu&iacute;mica y Biolog&iacute;a, Universidad del Norte, km 5, antigua v&iacute;a a Puerto Colombia. Barranquilla (Colombia). <a href="mailto:scotes@uninorte.edu.co">scotes@uninorte.edu.co</a>.     <p><b>Fecha de recepci&oacute;n:</b> 17 de mayo de 2013    <br> <b>Fecha de aceptaci&oacute;n:</b> 7 de mayo de 2013</p> </font> <hr> <font face="verdana" size="2">     <p><b>Resumen</b></p>     <p><b><i>Objetivos: </i></b><i>Calcular por medio de la modelizaci&oacute;n molecular descriptores moleculares para un grupo de 9-aminoacridinas (9-AA 2 a-e) de actividad biol&oacute;gica comprobada, los pares de bases Adenina-Timina (AT) y Guanina-Citosina (GC) y sus respectivos complejos. </i></p>     <p><i><b> Materiales y m&eacute;todos: </b>Las geometr&iacute;as moleculares de las 9-AA2 a-e y las bases nitrogenadas del ADNfueron optimizados usando el m&eacute;todo DFT B3LYP/6-31G**. Las propiedades de las 9-AA 2 a-e aisladas y sus interacciones m&aacute;s estables con AT y GC fueron investigadas usando el mismo m&eacute;todo.</i></p>     ]]></body>
<body><![CDATA[<p><b><i>Resultados: </i></b><i>Los resultados mostraron que las 9-AA 2 a-e presentan gran deslocalizaci&oacute;n de cargas, altas polarizabilidades y altos momentos dipolares, los cuales son propiedades determinantes para estudios de interacciones intermoleculares. Las 9-AA 2 a-e son aceptores de electrones, mientras que los pares de bases son donadores de electrones. </i></p>     <p><i><b>Conclusiones: </b>Del conjunto de 9-AA estudiadas, la 9-AA 2(d) presenta las mayores atracciones intermoleculares con los pares de bases del ADN, y la 9-AA 2(b) las m&aacute;s d&eacute;biles. </i></p>     <p><b>   Palabras clave: </b>ADN, 9-Aminoacridinas, c&aacute;lculos DFT.</p> </font>  <hr> <font face="verdana" size="2">     <p><b>Abstract</b></p>     <p><b><i>Objectives: </i></b><i>To calculate a set of molecular descriptors of a group of 9-aminoacridines (9-AA 2 a-e), of DNA base pairs adenine-thymine (AT) and guanine-cytosine (GC) and their respective complexes. </i></p>     <p><i><b>Materials and Methods: </b>Molecular geometries of 9-AA 2 a-e and DNA base pairs were optimized using the DFT B3LYP/6-31G ** method. The properties of the isolated 9-AA 2 a-e and stable interactions with AT and GC were studied using the same method.</i></p>     <p><b><i>Results: </i></b><i>The results showed that 9-AA 2 a-e have large charges, high dipole moments and high polarizabilities, properties which are decisive for intermolecular interaction studies. 9-AA 2 a-e are electron acceptors while base pairs are electron donors.</i></p>     <p><b><i>Conclusions: </i></b><i>9-AA 2(d) showed the strongest intermolecular interactions with DNA base pairs and 9-AA 2(b) the weakest. </i></p>     <p><b>Keywords: </b>DNA, 9-Aminoacridines, DFT calculations.</p> </font> <hr>      <p><font size="2" face="verdana"><b>Introducci&oacute;n</b></font></p><font face="verdana" size="2">     ]]></body>
<body><![CDATA[<p>Una de las caracter&iacute;sticas que presentan los &aacute;cidos nucleicos es que pueden interactuar de manera reversible y no covalente con diversas especies qu&iacute;micas que presentan bajo peso molecular. As&iacute;, los derivados de acridina <b>1 </b>que surgen de la sustituci&oacute;n estructural se constituyen en centro de inter&eacute;s por sus propiedades farmac&eacute;uticas como antitumoral (1-5), antiviral (6-8), antiprionica (9-10), antimicrobiana (11), antinflamatoria y analg&eacute;sica (12).</p>     <p>Solo hasta 1948 se report&oacute; por primera vez la actividad anticancer&iacute;gena de las 9-AA (13), la cual se explica p or la intercalaci&oacute;n del heterociclo de la acridina entre las bases adyacentes de los &aacute;cidos nucleicos (14). Hoy en d&iacute;a, las 9-AA siguen siendo usadas en el tratamiento de diversas enfermedades, tales como el lupus eritematoso, artritis reumatoidea, malaria, chagas, y otras, incluso, exhiben un amplio espectro de aplicaciones (15).</p>     <p>La importancia de la sustituci&oacute;n en el grupo 9-amino de la Acridina <b>1 </b>para la actividad biol&oacute;gica ha sido reportada en la literatura (16); su conjugaci&oacute;n con biomol&eacute;culas puede modular su actividad, biodisponibilidad y aplicabilidad, y tambi&eacute;n se ha descubierto que cadenas laterales pept&iacute;dicas orientan la selectividad por ciertas secuencias (17). </p>     <p><a href="img/revistas/sun/v29n3/v29n3a01f1.jpg" target="_blank">Figura 1</a>     <p>Por otra parte, la actividad biol&oacute;gica usualmente se correlaciona con la intensidad de las fuerzas intermoleculares, siendo m&uacute;ltiples los factores responsables de la interacci&oacute;n. Todas las sustancias que intercalan en el ADN lo hacen a trav&eacute;s de interacciones no covalentes y puentes de hidr&oacute;geno con los pares de bases. Las atracciones electrost&aacute;ticas son responsables de la especificidad y selectividad de las sustancias; y en el caso de sistemas polares y sistemas polic&iacute;clicos arom&aacute;ticos, la polarizabilidad, nucleofilia y electrofilia juegan un papel significativo, siendo la dispersi&oacute;n de la energ&iacute;a uno de los mayores componentes estabilizantes del sistema.</p>     <p>En este trabajo presentamos las estructuras e interacciones de cinco 9-AA sustituidas <b>2 a-e </b>(ver figura 1) y los pares de bases del ADN AT y GC, conjugados pept&iacute;dicos que han sido sintetizados y presentan afinidad por el ADN (18,19). Una fuerte interacci&oacute;n con el ADN se correlaciona con su citotoxicidad, sin embargo, limita su distribuci&oacute;n extravascular. Sebestik y colaboradores dise&ntilde;aron los conjugados pept&iacute;dicos 9-AA <b>2 a-e </b>usando sustituyentes de selectividad opuesta por el ADN; dado que la 9-AA <b>(1) </b>presenta afinidad por las bases GC, se adicionaron secuencias pept&iacute;dicas afines por AT. Los conjugados pept&iacute;dicos de la 9-AA <b>2 a-e </b>exhiben una d&eacute;bil interacci&oacute;n con el ADN, que se explica por el rol competitivo ejercido por los sustituyentes, y que podr&iacute;a favorecer una mejor velocidad de difusi&oacute;n extravascular.</p>     <p>En este art&iacute;culo se estudia te&oacute;ricamente por primera vez las interacciones de las 9-AA <b>2 a-e </b>con el ADN necesarias para una difusi&oacute;n corporal r&aacute;pida. Se optimizaron las geometr&iacute;as de los complejos de las 9-AA <b>2 a-e </b>con los pares de bases y se eval&uacute;an las variables estructurales responsables de las interacciones con el ADN, tales como las cargas at&oacute;micas y distancias de enlace, los efectos de la polarizabilidad, momento dipolar y energ&iacute;a de los orbitales de frontera HOMO y LUMO por la Teor&iacute;a del Funcional de la Densidad (DFT).</p>     <p><b>M&eacute;todos</b></p>     <p>Las estructuras de m&iacute;nima energ&iacute;a de las mol&eacute;culas aisladas y los complejos formados entre 9-AA <b>2 a-e </b>y los pares de bases fueron halladas con m&eacute;todos de mec&aacute;nica molecular (MMFF) usando el <i>software </i>Spartan '08 (20). Por medio del m&eacute;todo DFT, nivel B3LYP y base 6-31G** se optimizaron las 9-AA <b>2 a-e, </b>los pares de bases GC, AT y los complejos que estos forman.</p>     <p>Se calcularon los descriptores moleculares (cargas at&oacute;micas, distancias de enlace, &aacute;ngulos de enlace, momento dipolar, polarizabi-lidad y orbitales frontera HOMO y LUMO) de las mol&eacute;culas aisladas y sus respectivos complejos moleculares usando el paquete GAUSSIAN 03 (21) por el m&eacute;todo DFT, nivel B3LYP y base 6-31G**.</p>     ]]></body>
<body><![CDATA[<p><b>Resultados y discusi&oacute;n</b></p>     <p>La enumeraci&oacute;n de los pares de bases del ADN, AT y GC de Watson-Crick es visualizada en la figura 2. Las estructuras optimizadas de los complejos formados entre 9-AA 2 a-e con los pares de bases del ADN se muestran en las figuras 3 y 4. Es claro que no se conserva la coplanaridad en la interacci&oacute;n de las 9-AA 2 a-e con GC y de la 9-AA 2(c) con AT.</p>     <p>Algunos descriptores moleculares, tales como cargas at&oacute;micas, polarizabilidad, momento dipolar y energ&iacute;a de los orbitales moleculares de frontera de las bases aisladas, los pares de bases, las 9-AA <b>2 a-e </b>y sus complejos, son mostrados en la tabla 1.</p>     <p align="center"><img src="img/revistas/sun/v29n3/v29n3a01f2.jpg"></p>     <p><a href="img/revistas/sun/v29n3/v29n3a01f3.jpg" target="_blank">Figura 3</a>    <br> <a href="img/revistas/sun/v29n3/v29n3a01f4.jpg" target="_blank">Figura 4</a></p>     <p>El anillo central de las 9-AA <b>2 a-e </b>al formar los complejos con los pares de bases nitrogenadas presenta cambios significativos en las cargas at&oacute;micas, especialmente en los &aacute;tomos de carbono adyacentes al N14. Sin embargo, los cambios m&aacute;s significativos se presentan al interactuar con el par GC. Por ejemplo, la carga at&oacute;mica del C13 de la 9-AA <b>2(a) </b>es de 0,225, la cual cambia a -0,095 al interactuar con AT, mientras que al interactuar con GC su carga cambia a -0,222. La interacci&oacute;n m&aacute;s fuerte con GC se present&oacute; con la 9-AA <b>2(d), </b>que exhibi&oacute; adem&aacute;s p&eacute;rdida de la coplanaridad y cambios en los &aacute;ngulos de enlace de los sistemas heteroc&iacute;clicos.</p>     <p>Algunos &aacute;tomos electronegativos de las 9-AA <b>2 a-e, </b>despu&eacute;s de formar los complejos con GC, proveen parte de sus cargas a los &aacute;tomos de hidr&oacute;geno de este par de bases, formando posibles puentes de hidr&oacute;geno, interacci&oacute;n que podr&iacute;a estar asociada a la p&eacute;rdida de la coplanaridad. Por ejemplo, el H14 de GC es atra&iacute;do por el N14 de la 9-AA <b>2(b) </b>y por el O36 de la 9-AA <b>2(d), </b>respectivamente; el O35 de la 9-AA <b>2(c) </b>atrae al H28 de GC y al H30 en AT y en la 9-AA <b>2(e), </b>el N14 atrae al H2 de GC (ver figuras 3 y 4). A partir del estudio de los cambios de las cargas at&oacute;micas de los pares de bases, la interacci&oacute;n m&aacute;s fuerte con respecto a AT se produjo en los complejos AT---9-AA <b>2(c) </b>y AT---9-AA <b>2(d). </b>Los &aacute;tomos N15---H10 y O6---H27 en AT involucrados en los puentes de hidr&oacute;geno de estos sistemas presentaron los cambios m&aacute;s altos en sus cargas at&oacute;micas.</p>     <p>Por otra parte, las cadenas pept&iacute;dicas de las 9-AA <b>2(a, b, d </b>y <b>e) </b>presentan un puente de hidr&oacute;geno intramolecular entre H32 y C35=O (figura 1), los cuales desaparecen por interacci&oacute;n con G-C, y se observan grandes cambios en las cargas at&oacute;micas y en los &aacute;ngulos de torsi&oacute;n en las cadenas. En las 9-AA <b>2(a </b>y <b>b), </b>los cambios en los &aacute;ngulos de torsi&oacute;n se presentan a la altura del C25, lo cual impide la formaci&oacute;n del puente de hidrogeno. En el complejo 9-AA <b>2(d </b>y <b>e)</b>---GC, los &aacute;tomos de ox&iacute;geno presentes en las cadenas pept&iacute;dicas de estas 9-AA <b>2 a-e </b>cambian sus &aacute;ngulos de enlace, y se orientan hacia algunos hidr&oacute;genos en GC, lo cual impide tambi&eacute;n la formaci&oacute;n del puente de hidr&oacute;geno intramolecular antes mencionado.</p>     <p>Entre las 9-AA <b>2 a-e, </b>la que present&oacute; la diferencia de energ&iacute;a de los orbitales frontera m&aacute;s baja fue la 9-AA <b>2 (d), </b>(0,127 eV), lo cual indica que es la mol&eacute;cula m&aacute;s susceptible al ataque nucleof&iacute;lico de la serie en estudio, sin embargo, la reactividad basada en la teor&iacute;a de los orbitales moleculares de frontera se conserva dentro del mismo rango. Las 9-AA <b>2 a-e </b>tienden a presentar valores negativos en las energ&iacute;as de los orbitales de frontera (HOMO y LUMO), por lo tanto son buenos aceptores de electrones.</p>     ]]></body>
<body><![CDATA[<p>Los valores de las energ&iacute;as del orbital LUMO de las bases aisladas y de los pares de bases son m&aacute;s positivos en comparaci&oacute;n con los de las 9-AA 2 a-e, por lo tanto, las bases aisladas y los pares de bases son ciertamente donadores de electrones, lo cual se corresponde con el potencial de ionizaci&oacute;n de las bases (22-24).</p>     <p>La 9-AA <b>2(c) y 2 (d) </b>presentan los mayores momentos dipolares: 5,571 y 3,615 debye, respectivamente. En cuanto a la polarizabilidad molecular de las bases aisladas del ADN, el valor m&aacute;s alto es el de Guanina (191,180) y entre los pares de bases GC (246, 291). Las 9-AA <b>2 a-e, </b>al ser mol&eacute;culas grandes, tienen facilidad de dispersi&oacute;n de carga, lo cual contribuye a la estabilizaci&oacute;n de las interacciones moleculares. Del conjunto de 9-AA en estudio, la que present&oacute; la polarizabilidad m&aacute;s alta fue la 9-AA <b>2(c) </b>(350, 554).</p>     <p><a href="img/revistas/sun/v29n3/v29n3a01f5.jpg" target="_blank">Tabla 1</a>     <p>Se podr&iacute;a argumentar que los cambios m&aacute;s significativos en las interacciones moleculares presentadas en 9-AA <b>2(c) </b>y <b>(d) </b>se deben a un compromiso entre polarizabilidad y momento dipolar, ya que la 9-AA <b>2(e) </b>presenta la mayor polarizabilidad de la serie en estudio pero su momento dipolar es el segundo m&aacute;s bajo. Igualmente, se observa que GC, al poseer la mayor polarizabilidad y mayor momento dipolar de los pares de bases, favorece interacciones moleculares fuertes. En este orden de ideas, las interacciones m&aacute;s d&eacute;biles con el ADN se presentan en la 9-AA <b>2(b), </b>lo cual podr&iacute;a traducirse en una mejor difusi&oacute;n extravascular de este tipo de conjugado pept&iacute;dico de la acridina.</p>     <p><b>Conclusi&oacute;n</b></p>     <p>Las 9-AA <b>2 a-e </b>presentan alta polarizabilidad y son buenos aceptores de electrones, mientras que los pares de bases son buenos donadores de electrones, resultando interacciones favorables entre los dos sistemas. Del conjunto de mol&eacute;culas estudiadas, la 9-AA <b>2(d) </b>y el par GC presentan las interacciones m&aacute;s fuertes, y la 9-AA <b>2(b) </b>las m&aacute;s d&eacute;biles.</p>     <p>Conjugados pept&iacute;dicos del tipo 9-AA <b>2(b), </b>con polarizabilidad y momento dipolar moderados podr&iacute;an presentar una mejor difusi&oacute;n extravascular; factores que podr&iacute;an considerarse en el dise&ntilde;o de nuevos conjugados pept&iacute;dicos de las 9-AA para potencial uso medicinal. Se observ&oacute; que hay formaci&oacute;n de puentes de hidr&oacute;geno en las cadenas pept&iacute;dicas de las 9-AA <b>2 a-e </b>y &aacute;tomos de hidr&oacute;geno presentes en GC, lo cual podr&iacute;a facilitar la p&eacute;rdida de la coplanaridad en las interacciones; contrario a lo que ocurre entre las 9-AA <b>2 a-e </b>con AT. La p&eacute;rdida de la coplanaridad conllevar&iacute;a a cambios en la estructura 3D del ADN.</p>     <p><b>Conflicto de inter&eacute;s: </b>ninguno.</p>     <p><b>Financiaci&oacute;n: </b>este estudio fue realizado gracias al apoyo y financiaci&oacute;n de la Direcci&oacute;n de Investigaci&oacute;n, Desarrollo e Innovaci&oacute;n (DIDI) de la Universidad del Norte. Proyecto 200602750.</p> </font> <hr> <font face="verdana" size="2"></font><font face="verdana" size="2">     <p><b>Notas</b></p>      ]]></body>
<body><![CDATA[<p><a name="n_1"></a><a href="#n1"><sup>1</sup></a> Departamento de Qu&iacute;mica y Biolog&iacute;a, Universidad del Norte (Colombia).</p>     <p><a name="n_2"></a><a href="#n2"><sup>2</sup></a> Universidad del Atl&aacute;ntico, Km 7 Antigua V&iacute;a a Puerto Colombia, Barranquilla (Colombia).</p> </font> <hr> <font face="verdana" size="2"></font>     <p><font size="2" face="verdana"><b>Referencias</b></font></p><font face="verdana" size="2">     <!-- ref --><p>1. Belmont P, Bosson, Godet T, Tiano M. <i>Anticancer Agents Med Chem </i>2007; (7):139-169.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000056&pid=S0120-5552201300030000100001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>     <!-- ref --><p>2. 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