<?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>1405-3322</journal-id>
<journal-title><![CDATA[Boletín de la Sociedad Geológica Mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Soc. Geol. Mex]]></abbrev-journal-title>
<issn>1405-3322</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Geológica Mexicana A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-33222016000100165</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[DNA structure and architecture in the chromosome and plasmid of hyperthermophilic organisms, a theoretical approach]]></article-title>
<article-title xml:lang="es"><![CDATA[Estructura y arquitectura de ADN en cromosomas y plásmidos de organismos hipertermofílicos, una aproximación teórica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vázquez]]></surname>
<given-names><![CDATA[Héctor G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Becerra]]></surname>
<given-names><![CDATA[Arturo]]></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 ]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2016</year>
</pub-date>
<volume>68</volume>
<numero>1</numero>
<fpage>165</fpage>
<lpage>172</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222016000100165&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222016000100165&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222016000100165&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Hyperthermophilic organisms have been recognized as an important element in the origin and early evolution of life on Earth, but also as a model for exobiological studies. Analyzing their molecular dynamics can help us understand this important lifestyle. In this study, using bioinformatic tools, the DNA composition in chromosomes and plasmids of hyperthemophilic organism were compared, and their structure, probable amino acid bias and DNA flexibility were analyzed. In some chromosomes and plasmids shows differential features of DNA flexibility and skews in mutation rate, which suggests that only some molecular elements show high values of variability, contrary to the proposal of the flexible genome theory.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los organismos hipertermofílicos han sido reconocidos tanto como un elemento importante en el origen y la evolución temprana de la vida en la Tierra, como un modelo en estudios de exobiología. Analizar sus dinámicas moleculares nos puede ayudar a entender este importante estilo de vida. En este estudio, usando scripts y software, se comparó la composición del DNA en los cromosomas y plásmidos de organismos hipertermófilos, y se analizó su estructura, su probable sesgo en el uso de aminoácidos y la flexibilidad del DNA. En algunos cromosomas y plásmidos se presentaron características diferenciales de flexibilidad del DNA y sesgos en su tasa de mutación, lo cual sugiere que sólo algunos elementos moleculares muestran altos niveles de variabilidad, contrariamente a lo propuesto en la teoría de genoma flexible.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[chromosome]]></kwd>
<kwd lng="en"><![CDATA[plasmids]]></kwd>
<kwd lng="en"><![CDATA[Quintana values]]></kwd>
<kwd lng="en"><![CDATA[DNA twisting]]></kwd>
<kwd lng="en"><![CDATA[codon usage]]></kwd>
<kwd lng="en"><![CDATA[hyperthermophiles]]></kwd>
<kwd lng="es"><![CDATA[cromosoma]]></kwd>
<kwd lng="es"><![CDATA[plásmidos]]></kwd>
<kwd lng="es"><![CDATA[valores de Quintana]]></kwd>
<kwd lng="es"><![CDATA[torsión de DNA]]></kwd>
<kwd lng="es"><![CDATA[uso de codones]]></kwd>
<kwd lng="es"><![CDATA[hipertermófilos]]></kwd>
</kwd-group>
</article-meta>
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