869 resultados para Bergama (Turkey). Temple of Trojan.


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Estampada en la misma hoja con el grabado de "Vista de Almenara, tomada de Murviedro" y con huella de plancha común (53'5 x 31'5 cm)

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Widespread interest in producing transgenic organisms is balanced by concern over ecological hazards, such as species extinction if such organisms were to be released into nature. An ecological risk associated with the introduction of a transgenic organism is that the transgene, though rare, can spread in a natural population. An increase in transgene frequency is often assumed to be unlikely because transgenic organisms typically have some viability disadvantage. Reduced viability is assumed to be common because transgenic individuals are best viewed as macromutants that lack any history of selection that could reduce negative fitness effects. However, these arguments ignore the potential advantageous effects of transgenes on some aspect of fitness such as mating success. Here, we examine the risk to a natural population after release of a few transgenic individuals when the transgene trait simultaneously increases transgenic male mating success and lowers the viability of transgenic offspring. We obtained relevant life history data by using the small cyprinodont fish, Japanese medaka (Oryzias latipes) as a model. Our deterministic equations predict that a transgene introduced into a natural population by a small number of transgenic fish will spread as a result of enhanced mating advantage, but the reduced viability of offspring will cause eventual local extinction of both populations. Such risks should be evaluated with each new transgenic animal before release.

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In 2011 Turkish officials began indicating their intention to suspend all contact with Cyprus’s presidency of the Council of the European Union (EU), slated for the second half of 2012, given the issues surrounding the unresolved Cyprus conflict. This came as the latest development in a long and arduous path of Turkeys application for EU membership that began in 1987. This paper provides the context – the Cyprus conflict, Turkeys EU accession negotiations, and the Cyprus reunification talks – in understanding the reasons and consequences of Ankara’s boycott of the Cyprus presidency. The article also considers the evolving nature and the role of the rotating presidency of the Council of the EU, especially after the implementation of the Lisbon Treaty, and how this may have played into Turkeys calculations in calling for the boycott.