980 resultados para Carbon-Minas-València (Regne)-Explotación-S. XIX


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Obra premiada por la Real Sociedad de Amigos del Pais de Valencia en 1802

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Huella recortada.-Cartela en la parte inferior

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Escala expresada en otras unidades

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Inscripción en la parte superior: "Valenza". En la parte inferior marca tipográfica: "C 4"

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Inscripción en la parte superior izquierda: "Pl. 27"

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Relieve por sombreado

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Abundante información toponímica.

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Escala en el ángulo superior derecho expresada en varias unidades

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Escala en el ángulo superior derecho expresada en varias unidades

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The chemical structure of refractory marine dissolved organic matter (DOM) is still largely unknown. Electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI FT-ICR-MS) was used to resolve the complex mixtures of DOM and provide valuable information on elemental compositions on a molecular scale. We characterized and compared DOM from two sharply contrasting aquatic environments, algal-derived DOM from the Weddell Sea (Antarctica) and terrigenous DOM from pore water of a tropical mangrove area in northern Brazil. Several thousand molecular formulas in the mass range of 300-600 Da were identified and reproduced in element ratio plots. On the basis of molecular elemental composition and double-bond equivalents (DBE) we calculated an average composition for marine DOM. O/C ratios in the marine samples were lower (0.36 ± 0.01) than in the mangrove pore-water sample (0.42). A small proportion of chemical formulas with higher molecular mass in the marine samples were characterized by very low O/C and H/C ratios probably reflecting amphiphilic properties. The average number of unsaturations in the marine samples was surprisingly high (DBE = 9.9; mangrove pore water: DBE = 9.4) most likely due to a significant contribution of carbonyl carbon. There was no significant difference in elemental composition between surface and deep-water DOM in the Weddell Sea. Although there were some molecules with unique marine elemental composition, there was a conspicuous degree of similarity between the terrigenous and algal-derived end members. Approximately one third of the molecular formulas were present in all marine as well as in the mangrove samples. We infer that different forms of microbial degradation ultimately lead to similar structural features that are intrinsically refractory, independent of the source of the organic matter and the environmental conditions where degradation took place.

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Estudio realizado en : "Coloquios Inéditos Valencianos del siglo XVIII / Memoria de Licenciatura realizada por Maria Isabel Zubeldia Lauzurica. València : Facultat de Filologia, 1986"