938 resultados para Sandoval, Gonzalo de, fl. 1518-1528.


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Adaptations to new pollinators involve multiple floral traits, each requiring coordinated changes in multiple genes. Despite this genetic complexity, shifts in pollination syndromes have happened frequently during angiosperm evolution. Here we study the genetic basis of floral UV absorbance, a key trait for attracting nocturnal pollinators. In Petunia, mutations in a single gene, MYB-FL, explain two transitions in UV absorbance. A gain of UV absorbance in the transition from bee to moth pollination was determined by a cis-regulatory mutation, whereas a frameshift mutation caused subsequent loss of UV absorbance during the transition from moth to hummingbird pollination. The functional differences in MYB-FL provide insight into the process of speciation and clarify phylogenetic relationships between nascent species.

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Welsch (Projektbearbeiter): Die Österreichische National-Bank sieht sich angesichts des Ansturms auf die Bankeinlagen gezwungen, die Auszahlungen auf 25 Gulden pro Kontoinhaber zu beschränken

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Von A. Sliwa

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Vom Dr. H. Karsten

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Telemann. [Text: Gottfried Simonis]

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An integrated instrument package for measuring and understanding the surface radiation budget of sea ice is presented, along with results from its first deployment. The setup simultaneously measures broadband fluxes of upwelling and downwelling terrestrial and solar radiation (four components separately), spectral fluxes of incident and reflected solar radiation, and supporting data such as air temperature and humidity, surface temperature, and location (GPS), in addition to photographing the sky and observed surface during each measurement. The instruments are mounted on a small sled, allowing measurements of the radiation budget to be made at many locations in the study area to see the effect of small-scale surface processes on the large-scale radiation budget. Such observations have many applications, from calibration and validation of remote sensing products to improving our understanding of surface processes that affect atmosphere-snow-ice interactions and drive feedbacks, ultimately leading to the potential to improve climate modelling of ice-covered regions of the ocean. The photographs, spectral data, and other observations allow for improved analysis of the broadband data. An example of this is shown by using the observations made during a partly cloudy day, which show erratic variations due to passing clouds, and creating a careful estimate of what the radiation budget along the observed line would have been under uniform sky conditions, clear or overcast. Other data from the setup's first deployment, in June 2011 on fast ice near Point Barrow, Alaska, are also shown; these illustrate the rapid changes of the radiation budget during a cold period that led to refreezing and new snow well into the melt season.

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Desde que críticos como Aldo Ruffinato o Baños Vallejo comenzaron a estudiar la hagiografía española medieval basándose en la teoría narratológica de Bremond, este género se concibió como el ejemplo más acabado de narración lineal y ascendente. En este trabajo pretendo mostrar una aproximación narratológica diferente a las intentadas hasta ahora, usando como fuente la Vida de Santo Domingo de Silos de Gonzalo de Berceo. Para eso, me centraré en aquellos aspectos que contradigan o escapen a esa supuesta linealidad y muestren la textura conflictiva y dialéctica del relato. Esto permitirá apreciar que el texto,lejos de presentar un ascenso armonioso, es un arduo recorrido muchas veces circular y repetitivo, a través de intentos de dar una resolución simbólica a conflictos reales como la relación entre la vida contemplativa y la vida sacerdotal, el poder eclesiástico y el poder secular o la libertad humana y la omnipotencia divina.

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Fil: Rodríguez, Laura Graciela. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

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Fil: Chain, Leyla Inés. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

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Este libro es fruto de un esfuerzo colectivo por comprender el poder como una construcción social, destacando los aportes de la historia local para una mejor comprensión de la historia nacional mexicana en su primer medio siglo de independencia.