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Abstract. E-learning technologies have developed greatly in recent years, with considerable success, which has suggested extending distance education to other mediums. This paper studies the possibilities of Interactive Digital TV to provide educational services (t-learning) and analyzes the support offered by the Multimedia Home Platform standard (MHP). We also present an approach to developing interactive t-learning courses and a tool, based on public and well-known technologies, that implements our proposal over the MHP technological framework. Our approach is remarkable for being flexible, extensible and easy to integrate with existing standards for the management of learning content, thus promoting interoperability and content reuse. In addition, applications can be developed with no need of programming knowledge. This is essential to free designers from technological details, so that they can concentrate on the broadcast contents, their sequence, interrelations and every aspect that makes up a value-added application.

Genetic and environmental prenatal factors influencing the fluctuating asymmetry of the a-b interdigital ridge count are examined. From the results obtained we can conclude that fluctuating asymmetry of the a-b interdigital ridge count is poorly influenced by genetic factors. We suggest that fluctuating asymmetry of dermatoglyphics provides a good measure of developmental stability in humans, especially for males. The results also indicate that random environmental factors, acting before the 19th week of embryonic development, could be related to the differential timing of maturation of the sexes.

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