<?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>1665-1456</journal-id>
<journal-title><![CDATA[Biotecnia]]></journal-title>
<abbrev-journal-title><![CDATA[Biotecnia]]></abbrev-journal-title>
<issn>1665-1456</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Sonora, División de Ciencias Biológicas y de la Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-14562020000300081</article-id>
<article-id pub-id-type="doi">10.18633/biotecnia.v22i3.1228</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Densidad y módulo dinámico longitudinal de tres maderas angiospermas impregnadas con boro]]></article-title>
<article-title xml:lang="en"><![CDATA[Density and longitudinal dynamic modulus of three angiosperm woods impregnated with boron]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sotomayor Castellanos]]></surname>
<given-names><![CDATA[Javier Ramón]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ávila Calderón]]></surname>
<given-names><![CDATA[Luz Elena Alfonsina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo  ]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>22</volume>
<numero>3</numero>
<fpage>81</fpage>
<lpage>86</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-14562020000300081&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-14562020000300081&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-14562020000300081&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo de la investigación fue determinar las densidades y los módulos dinámicos con vibraciones longitudinales, antes y después de aplicar el tratamiento de impregnación con sales de boro a madera de Spathodea campanulata, Fraxinus americana y Albizia plurijuga. Para cada especie se trabajaron 40 probetas que se impregnaron con el método de baño caliente-frío y se determinaron las retenciones correspondientes a concentraciones de 1 %, 2 % y 3 %. Las densidades de las maderas no se modifican después del tratamiento. Las densidades antes del tratamiento fueron 351 kg m-3 para S. campanulata, 654 kg m-3 para F. americana y 830 kg m-3 para A. plurijuga. Los módulos dinámicos de F. americana y A. plurijuga no variaron por el tratamiento. Caso diferente es S. campanulata cuyos módulos dinámicos sí variaron. Los módulos dinámicos antes del tratamiento fueron 4765 MN m-2 para S. campanulata, 13303 MN m-2 para F. americana y 16769 MN m-2 para A. plurijuga. Con base en sus módulos dinámicos las maderas de F. americana y A. plurijuga pueden usarse en diseño estructural. En cambio, S. campanulata puede emplearse como componente en productos donde no se requiera alta resistencia mecánica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The objective of the investigation was to determine the densities and dynamic modules with longitudinal vibrations, before and after applying the impregnation treatment based on boron salts to wood from Spathodea campanulata, Fraxinus americana and Albizia plurijuga. For each species, 40 specimens were impregnated with the hot-cold bath method and the corresponding retentions were determined at concentrations of 1%, 2% and 3%. Wood densities do not change after treatment. The densities before treatment were 351 kg m-3 for S. campanulata, 654 kg m-3 for F. americana and 830 kg m-3 for A. plurijuga. The dynamic modules of F. americana and A. plurijuga did not vary by treatment. A different case is S. campanulata whose dynamic modules did vary. The dynamic modules before treatment were 4765 MN m-2 for S. campanulata, 13303 MN m-2 for F. americana and 16769 MN m-2 for A. plurijuga. Based on its dynamic modules, the woods of F. americana and A. plurijuga can be used in structural design. Instead, S. campanulata can be used as a component in products where high mechanical resistance is not required.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Albizia plurijuga]]></kwd>
<kwd lng="es"><![CDATA[baño caliente-frío]]></kwd>
<kwd lng="es"><![CDATA[Fraxinus americana]]></kwd>
<kwd lng="es"><![CDATA[Spathodea campanulata]]></kwd>
<kwd lng="en"><![CDATA[Albizia plurijuga]]></kwd>
<kwd lng="en"><![CDATA[Fraxinus Americana]]></kwd>
<kwd lng="en"><![CDATA[hot-cold bath]]></kwd>
<kwd lng="en"><![CDATA[Spathodea campanulata]]></kwd>
</kwd-group>
</article-meta>
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