<?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>1665-1995</journal-id>
<journal-title><![CDATA[REB. Revista de educación bioquímica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. educ. bioquím]]></abbrev-journal-title>
<issn>1665-1995</issn>
<publisher>
<publisher-name><![CDATA[Asociación Mexicana de Profesores de Bioquímica A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-19952014000400096</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Origen y mecanismos de la radio-resistencia en Deinococcus radiodurans]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alcántara Díaz]]></surname>
<given-names><![CDATA[David]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Investigaciones Nucleares Departamento de Biología, ]]></institution>
<addr-line><![CDATA[Ocoyoacac Estado de México]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2014</year>
</pub-date>
<volume>33</volume>
<numero>4</numero>
<fpage>96</fpage>
<lpage>103</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-19952014000400096&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-19952014000400096&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-19952014000400096&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Durante la adaptación darwiniana a condiciones ambientales extremas, ocurre una selección natural de los organismos con mayores probabilidades de sobrevivir y reproducirse. Sin embargo, en el caso de la bacteria Deinococcus radiodurans, altamente resistente a radiación gamma y ultravioleta (UV), es difícil explicar cómo ocurrió esto en virtud de que en su hábitat natural nunca ha estado expuesta a los niveles de radiación suficientes para inducir el desarrollo de dicho fenotipo. Varias hipótesis han sido propuestas para explicar los mecanismos celulares que causan esta elevada resistencia a radiación así como las condiciones ambientales que probablemente propiciaron su aparición. Una de esas hipótesis propone que D. radiodurans estuvo expuesto a elevados niveles de radiación fuera de la Tierra, tal vez Marte, y que fue allá donde adquirió dicho fenotipo. Sin embargo, debido a las dificultades que presenta esta hipótesis para explicar cómo pudo realizar esta bacteria la travesía de ida y vuelta entre la Tierra y Marte, ha ocasionado que la hipótesis de que la elevada resistencia a radiación fue adquirida colateralmente como resultado de la adaptación a alguna condición ambiental extrema en su hábitat natural terrestre, sea la más aceptada.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract During the process of Darwinian adaptation to extreme environmental conditions, natural selection of organisms more likely to survive and reproduce takes place. However, in the case of Deinococcus radiodurans, a highly resistant bacterium to both ionizing and non-ionizing radiation, it is difficult to explain how this happened because under natural conditions it has never been exposed to the radiation levels sufficient to create a selective pressure for the development of radiation resistance. Several hypotheses have been proposed to explain the cellular mechanisms causing its high resistance to gamma and UV radiation as well as the environmental conditions that likely gave rise to it. One such hypothesis is that D. radiodurans was exposed to high levels of radiation outside the Earth, perhaps on Mars, where this phenotype developed. However, the difficulties to explain how this bacterium could make the round trip between Earth and Mars have caused the preference of the idea that the high radiation resistance was acquired as a collateral consequence during adaptation to a different environmental situation in its terrestrial natural habitat.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Deinococcus radiodurans]]></kwd>
<kwd lng="es"><![CDATA[Radioresistencia]]></kwd>
<kwd lng="es"><![CDATA[Panspermia]]></kwd>
<kwd lng="en"><![CDATA[Deinococcus radiodurans]]></kwd>
<kwd lng="en"><![CDATA[Radiation Resistance,Panspermia]]></kwd>
</kwd-group>
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