espanolEn los ultimos anos ha crecido el interes de utilizar los acidos nucleidos y proteinas en nanodispositivos. Sin embargo, algunas de sus propiedades electronicas aun no se entienden claramente. Abordamos el problema de la transmision electronica a traves de un segmento finito de ADN, usando un modelo de cadena lineal dentro del formalismo de enlace fuerte con interaccion a primeros vecinos y un orbital por sitio para representar el ADN. Los efectos de hidratacion se incluyen como variaciones aleatorias de las autoenergias. La probabilidad de transmision se calcula a partir del concepto de matriz de transferencia. EnglishIn the last years have grown the interest to use necleic acids and proteins in nanodevices. However, some their electronic properties remain unclear and there is still much more to be done. We address the problem of charge transport across a finifte segment of DNA, using a linear chain model into tight binding framework with nearest neighbors interaction and one orbital per site to represent the DNA. Hydrations effects are taken into account as random variations of the self-energy. Transmission probability is calculated from transfer matrix concept.