<?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>2224-5421</journal-id>
<journal-title><![CDATA[Revista Cubana de Química]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cub Quim]]></abbrev-journal-title>
<issn>2224-5421</issn>
<publisher>
<publisher-name><![CDATA[Ediciones UO, Universidad de Oriente]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2224-54212020000100003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Producción de la proteína recombinante Gp-41 (VIH-1) en E.coli: Efecto del campo magnético]]></article-title>
<article-title xml:lang="en"><![CDATA[Production of Gp-41 (HIV-1) recombinant protein in E.coli: effect of magnetic field]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Narciandi-Díaz]]></surname>
<given-names><![CDATA[Ramón Emilio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivera-Martin]]></surname>
<given-names><![CDATA[Juan Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Centro de Ingeniería Genética y Biotecnología  ]]></institution>
<addr-line><![CDATA[Ciudad Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2020</year>
</pub-date>
<volume>32</volume>
<numero>1</numero>
<fpage>3</fpage>
<lpage>19</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2224-54212020000100003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2224-54212020000100003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2224-54212020000100003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La influencia del campo electromagnético de extrema baja frecuencia fue estudiada en un cultivo incrementado de Escherichia coli (E.coli), desarrollado para la producción de la proteína recombinante Gp-41 del virus de inmunodeficiencia humana tipo 1 (VIH-1). Fue utilizado un electroimán, que genera campos magnéticos no homogéneos, con un valor de inducción constante de 0, 055 Tesla (550 G), y un tiempo de exposición de 6,5 h. Con la aplicación del campo magnético se obtuvo un incremento de 1,2 veces la producción volumétrica (320 mg/L) y 1,5 veces en la productividad del proceso (30 mg/L.h). Al mismo tiempo, disminuyó 20 veces la producción de acetato hasta valores de 0,47 g/L, mientras que el nivel de expresión de la proteína Gp-41 se incrementó a 10 %.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The influence of the extremely low frequency electromagnetic field was studied in a fed batch culture of Escherichia coli (E.coli), developed for the production of the recombinant Gp-41 protein of human immunodeficiency virus type 1 (HIV-1). An electromagnet, which generates non-homogeneous magnetic fields, was used, at a constant induction value of 0.055 Tesla, and exposure time of 6, 5 h. With the application of the magnetic field, a 1,2-fold increase in volumetric production (320 mg / L) and 1,5 times in process productivity (30 mg / L) were obtained. At the same time, acetate production decreased 20 times to values &#8203;&#8203;of 0, 47 g / L, while the expression level of Gp-41 protein increased to 10 %.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[E. coli]]></kwd>
<kwd lng="es"><![CDATA[Gp-41]]></kwd>
<kwd lng="es"><![CDATA[HIV-1]]></kwd>
<kwd lng="es"><![CDATA[cultivo incrementado]]></kwd>
<kwd lng="es"><![CDATA[campo magnético]]></kwd>
<kwd lng="en"><![CDATA[E. coli]]></kwd>
<kwd lng="en"><![CDATA[Gp-41]]></kwd>
<kwd lng="en"><![CDATA[HIV-1]]></kwd>
<kwd lng="en"><![CDATA[fed batch culture]]></kwd>
<kwd lng="en"><![CDATA[magnetic field]]></kwd>
</kwd-group>
</article-meta>
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