5 resultados para Monarch butterfly
em Consorci de Serveis Universitaris de Catalunya (CSUC), Spain
Resumo:
Contingent sovereign debt can create important welfare gains. Nonetheless,there is almost no issuance today. Using hand-collected archival data, we examine thefirst known case of large-scale use of state-contingent sovereign debt in history. Philip IIof Spain entered into hundreds of contracts whose value and due date depended onverifiable, exogenous events such as the arrival of silver fleets. We show that this allowedfor effective risk-sharing between the king and his bankers. The data also stronglysuggest that the defaults that occurred were excusable they were simply contingenciesover which Crown and bankers had not contracted previously.
Resumo:
Aquest estudi s’insereix en un projecte de tesi. L’estudi versa sobre l’ideal egipci de monarquia durant el Regne Mitjà, a partir de l’anàlisi directa de quatre fonts literàries del període. S’ha constatat que la concepció de monarquia resultant, concebuda com a clàssica o modèlica, és la que es transmet en essència fins a l’etapa final de la història antiga egípcia, encara que readaptant-se a les noves realitats polítiques i culturals. L’anàlisi d’aquest ideal teòric de monarquia ha estat fonamental per afrontar l’objectiu essencial del projecte de tesi: l’estudi de la legitimació d’Alexandre el Gran com a faraó d’Egipte, és a dir, l’examen en profunditat del conjunt de mecanismes mitjançant els quals el macedoni va assumir el rol clàssic dels monarques egipcis i que expliciten el procés segons el qual un nou sobirà, que a més era d’origen estranger, fou inserit en la ideologia faraònica tradicional. Per tal de determinar com això es va produir, es fa necessari l’estudi del període en què Alexandre és el titular del tron del país (332-323 aC), és a dir, del moment de gènesi, formulació i desenvolupament de l’entramat ideològic que proporcionarà base teològica al nou govern i l’adequarà a la tradició. Per a l’examen d’aquest període cronològic, la documentació egípcia s’erigeix com la principal font d’informació, i per tant, durant el projecte s’ha compilat i analitzat el conjunt de la documentació de procedència egípcia disponible fins al moment que, datada o no, s’adscriu cronològicament a aquest període.
Resumo:
A generalization of reaction-diffusion models to multigeneration biological species is presented. It is based on more complex random walks than those in previous approaches. The new model is developed analytically up to infinite order. Our predictions for the speed agree to experimental data for several butterfly species better than existing models. The predicted dependence for the speed on the number of generations per year allows us to explain the change in speed observed for a specific invasion
Resumo:
En un momento histórico en el que las tendencias musicales en Europa estaban a medio camino entre el Barroco y el Clasicismo, confluyeron en la corte de Federico el Grande una serie de músicos que trabajaron para el rey prusiano y que compusieron una gran cantidad de música para flauta, instrumento que él tocaba. La actividad musical del Berlín de esos años se convirtió así en relevante para el mundo flautístico. Profundizaremos en este trabajo en la figura del monarca, en la relación de éste con sus músicos y en las características principales de la música de la segunda mitad del siglo XVIII.
Resumo:
Background: In the course of evolution butterflies and moths developed two different reproductive behaviors. Whereas butterflies rely on visual stimuli for mate location, moths use the"female calling plus male seduction" system, in which females release long-range sex pheromones to attract conspecific males. There are few exceptions from this pattern but in all cases known female moths possess sex pheromone glands which apparently have been lost in female butterflies. In the day-flying moth family Castniidae ("butterfly-moths"), which includes some important crop pests, no pheromones have been found so far. Methodology/Principal Findings: Using a multidisciplinary approach we described the steps involved in the courtship of P. archon, showing that visual cues are the only ones used for mate location; showed that the morphology and fine structure of the antennae of this moth are strikingly similar to those of butterflies, with male sensilla apparently not suited to detect female-released long range pheromones; showed that its females lack pheromone-producing glands, and identified three compounds as putative male sex pheromone (MSP) components of P. archon, released from the proximal halves of male forewings and hindwings. Conclusions/Significance: This study provides evidence for the first time in Lepidoptera that females of a moth do not produce any pheromone to attract males, and that mate location is achieved only visually by patrolling males, which may release a pheromone at short distance, putatively a mixture of Z,E-farnesal, E,E-farnesal, and (E,Z)-2,13-octadecadienol. The outlined behavior, long thought to be unique to butterflies, is likely to be widespread in Castniidae implying a novel, unparalleled butterfly-like reproductive behavior in moths. This will also have practical implications in applied entomology since it signifies that the monitoring/control of castniid pests should not be based on the use of female-produced pheromones, as it is usually done in many moths.