991 resultados para Williamson, Hugh, 1735-1819.


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Ocean acidification is predicted to have severe consequences for calcifying marine organisms especially molluscs. Recent studies, however, have found that molluscs in marine environments with naturally elevated or fluctuating CO2 or with an active, high metabolic rate lifestyle may have a capacity to acclimate and be resilient to exposures of elevated environmental pCO2. The aim of this study was to determine the effects of near future concentrations of elevated pCO2 on the larval and adult stages of the mobile doughboy scallop, Mimachlamys asperrima from a subtidal and stable physio-chemical environment. It was found that fertilisation and the shell length of early larval stages of M. asperrima decreased as pCO2 increased, however, there were less pronounced effects of elevated pCO2 on the shell length of later larval stages, with high pCO2 enhancing growth in some instances. Byssal attachment and condition index of adult M. asperrima decreased with elevated pCO2, while in contrast there was no effect on standard metabolic rate or pHe. The responses of larval and adult M. asperrima to elevated pCO2 measured in this study were more moderate than responses previously reported for intertidal oysters and mussels. Even this more moderate set of responses are still likely to reduce the abundance of M. asperrima and potentially other scallop species in the world's oceans at predicted future pCO2 levels.

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Si consideramos la forma de la Tierra desde un punto de vista matemático, entonces no debemos tener en cuenta la forma de su relieve continental ni las alteraciones en el nivel de los mares. Únicamente deberíamos estudiar el contorno medio del globo, determinado por la superficie libre de los océanos -supuestas las aguas en perfecto reposo relativo- prolongada idealmente bajo los continentes. Dicha superficie se llama geoide.

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Alcance y contenido: Copia ms. 1770 jun. 12, del testamento de Jeronimo Boada, ante Carlos Bonafe, para recla mar el cumplimiento ante Jose Valldoriola (esposo de Madalena Boada), de la cláusula testamentaria en la que tras la muerte de sus dos hijas y herederas universales (Madalena e Inés), los bienes del curtidor fuesen bendidos en almoneda pública y lo resultante fuese utilizado en pagar misas por el difunto Jerónimo Boada en la capilla del Santo Crucifijo de la Iglesia del Monte Calvario

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Resumen: Descripción: retrato de busto de Esquines basado en escultura

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Resumen: Descripción: retrato de busto de Demóstenes basado en escultura

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Resumen: Descripción: retrato de busto de Pompeyo basado en una escultura