934 resultados para Barthells, Peter


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Signatur des Originals: S 36/G03126

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Signatur des Originals: S 36/G03315

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Signatur des Originals: S 36/G03511

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Signatur des Originals: S 36/G03631

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Signatur des Originals: S 36/G04457

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Signatur des Originals: S 36/G04458

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Schrift Behrens und sämtlicher Buchschmuck nach Zeichnungen von Professor Peter Behrens

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Hidden for the untrained eye through a thin layer of sand, laminated microbial sediments occur in supratidal beaches along the North Sea coast. The inhabiting microbial communities organize themselves in response to vertical gradients of light, oxygen or sulfur compounds. We performed a fine-scale investigation on the vertical zonation of the microbial communities using a lipid biomarker approach, and assessed the biogeochemical processes using a combination of microsensor measurements and a 13C-labeling experiment. Lipid biomarker fingerprinting showed the overarching importance of cyanobacteria and diatoms in these systems, and heterocyst glycolipids revealed the presence of diazotrophic cyanobacteria even in 9 to 20 mm depth. High abundance of ornithine lipids (OL) throughout the system may derive from sulfate reducing bacteria, while a characteristic OL profile between 5 and 8 mm may indicate presence of purple non-sulfur bacteria. The fate of 13C-labeled bicarbonate was followed by experimentally investigating the uptake into microbial lipids, revealing an overarching importance of cyanobacteria for carbon fixation. However, in deeper layers, uptake into purple sulfur bacteria was evident, and a close microbial coupling could be shown by uptake of label into lipids of sulfate reducing bacteria in the deepest layer. Microsensor measurements in sediment cores collected at a later time point revealed the same general pattern as the biomarker analysis and the labeling experiments. Oxygen and pH-microsensor profiles showed active photosynthesis in the top layer. The sulfide that diffuses from deeper down and decreases just below the layer of active oxygenic photosynthesis indicates the presence of sulfur bacteria, like anoxygenic phototrophs that use sulfide instead of water for photosynthesis.

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En la última edición de Amadeus publicada con modificaciones de su autor (2001), Peter Shaffer introduce una periodización del proceso escritural de esta obra. Este gesto instituye un orden de lectura que busca organizar una historia de los conflictos entre Mozart y Salieri, entendiendo el término "historia" en un sentido teleológico. No obstante, desde la crítica genética resulta posible leer otra temporalidad en Amadeus, una temporalidad marcada por lo discontinuo y el anacronismo. Desde esta perspectiva se vuelve posible construir sistemas o ejes de lectura que crucen en forma transversal y rizomática la clave de lectura propuesta por Shaffer. En este trabajo analizaremos la temporalidad en Amadeus y para ello tendremos en cuenta: la propuesta de lectura del propio Shaffer; la temporalidad de los materia¬les de génesis, la condición de la obra como ficcionalización de hechos históricos; la consecuente presencia de elementos anacrónicos en la escritura; y el rol de la intertextualidad en la génesis de Amadeus, afectando tanto a esta pieza como a las obras-enunciados con las que entra en polémica