Search results for "NAD"
showing 10 items of 2033 documents
V2O5 nanowires with an intrinsic iodination activity leading to the formation of self-assembled melanin-like biopolymers
2011
V2O5 nanowires act as biomimetic catalysts resembling vanadium haloperoxidases (V-HPO). The nanowires display iodinating activity as confirmed by a colorimetric assay using thymol blue (TB), UV/Vis spectrophotometry and mass spectrometry (FD-MS). In the presence of dopamine these nanowires catalyze the fast and efficient synthesis of melanin-like biopolymers under mild conditions (aqueous solution, neutral pH and room temperature). The resulting melanin-like biopolymer obtained by the V2O5 nanowire catalysts was characterized by scanning electron microscopy (SEM), X-ray diffraction, UV-Vis, FT-IR and electric conductivity resembling the natural biopolymer both in its chemical and morphologi…
Platería morisca de obra de hilo (siglo XVI)
2019
The article discusses twenty tests performed by Valencian artisans to become masters of ―wire work‖ between the years 1508 and 1538. Considered minor works in the area of silver smithery, these pieces of jewellery are characterized by superimposed wire decoration. A peculiarity of these tests was that the pieces were not drawn on paper (the common practice for record-keeping purposes), but rather blackened and then stamped on- to paper. As a result, life-size and dated imprints have been preserved. as have the names of the artisans. They were silver workers whose biographies are known, all of them Christian; many of them worked in the Tossal district of Valencia, next to the M usli…
An approach to the high mountain settlements in the Pyrenees from Archaeology and Ethnography
2021
En este artículo se presentan los resultados de un trabajo de investigación destinado a verificar la existencia de diversos modelos de poblamiento en las zonas de alta montaña de los Pirineos a lo largo de la historia. Para ello se ha contrastado la documentación etnográfica sobre los pastores trashumantes recogida a principios del s. XX con el registro arqueológico obtenido durante diversas campañas de prospección llevadas a cabo en el Parque Nacional de Aigüestortes i Estany de Sant Maurici (Lérida). Los resultados de la investigación permiten verificar la existencia de cómo mínimo tres modelos de poblamiento basados en prácticas ganaderas distintas a la ganadería trashumante tradicional …
The ‘grave of the Court Pit’, A rediscovered Bronze Age tomb from Carchemish
2014
This paper examines the British Museum unpublished records related to an Early Bronze (EB) Age pithos burial uncovered a century ago in the Inner Town at Carchemish. The grave, cursorily cited and variously dated (Chalcolithic, EB or even LBA) in the final reports, was described in some detail by Hogarth and Thompson; a precise dating is, however, possible today thanks to the information of paramount importance given by T. E. Lawrence who identified and took a picture of the associated finds, which was recently rediscovered in the Carchemish Archives. The pithos can be now ascribed to the third quarter of the third millennium BC and helps to confirm the recent theory according to which the …
Chemisorption of hydrogen on a V5+ cluster
1996
Abstract The binding between V 5 + and hydrogen is studied by collision induced dissociation of the cluster-adsorbate V 5 + H 2 . Vanadium clusters are produced by laser vaporization and injected into an electromagnetic ion trap. After mass separation of V 5 + , the pulsed addition of hydrogen yields V 5 + H 2 . The desorption of hydrogen is studied by acceleration of V 5 + H 2 with variable rf voltages and collisions with argon atoms. From the threshold voltage necessary for dissociation a binding energy of H 2 on V 5 + of 2.4 ± 0.3 eV is estimated. This value is consistent with a dissociative chemisorption of hydrogen.
De bona fusta dolrada per mans de mestre. Techumbres policromadas en la arquitectura valenciana (siglos XIII-XV)
2015
La construcción de techumbres en madera ha sido tradicionalmente uno de los aspectos más característicos de la carpintería valenciana. A lo largo de la Edad Media, su producción se consolida no sólo a nivel funcional en grandes espacios libres como almacenes e iglesias, sino que pasa a desempeñar un notable papel decorativo en el interior de casas y palacios. La madera, labrada, dorada y policromada por manos expertas aportaba su esplendor al recinto, denotaba el gusto refinado de su promotor. A este deseo de lujo supieron responder los carpinteros de Valencia medieval, quienes se esforzaron por desarrollar nuevos diseños en cada encargo y lograron así perfeccionar las técnicas de fabricaci…
Effect of ADH II Deficiency on the Intracellular Redox Homeostasis in Zymomonas mobilis
2011
Mutant strain of the facultatively anaerobic, ethanol-producing bacteriumZymomonas mobilis, deficient in the Fe-containing alcohol dehydrogenase isoenzyme (ADH II), showed impaired homeostasis of the intracellular NAD(P)H during transition from anaerobic to aerobic conditions, and also in steady-state continuous cultures at various oxygen supplies. At the same time, ADH II deficiency in aerobically grown cells was accompanied by a threefold increase of catalase activity and by about 50% increase of hydrogen peroxide excretion. It is concluded that ADH II under aerobic conditions functions to maintain intracellular redox homeostasis and to protect the cells from endogenous hydrogen peroxide.
Crane collision modelling using a neural network approach
2004
Abstract The objective of the present work is to find a Collision Detection algorithm to be used in the Virtual Reality crane simulator (UVSim®), developed by the Robotics Institute of the University of Valencia for the Port of Valencia. The method is applicable to box-shaped objects and is based on the relationship between the colliding object positions and their impact points. The tool chosen to solve the problem is a neural network, the multilayer perceptron, which adapts to the characteristics of the problem, namely, non-linearity, a large amount of data, and no a priori knowledge. The results achieved by the neural network are very satisfactory for the case of box-shaped objects. Furth…
La experiencia ascética de las viudas de la aristocracia senatorial romana: más allá de la oración
1999
La viuda cristiana senatorial romana presenta unos rasgos bien definidos. Su autonomía personal, su disponibilidad financiera y su inquietud intelectual hacen posible su influencia en el seno de la Iglesia.
Niepokojący wschód azjatyckiej teologii. Wprowadzenie do studium
2021
Teologia w Polsce nie dysponuje tłumaczeniami ani opracowaniami w zakresie teologii i duchowości azjatyckiej. W dodatku na płaszczyźnie pastoralnej kontakt z Dalekim Wschodem nacechowany jest lękiem, wynikającym z braku wiedzy. Instytut badań nad Teologią i Duchowością Dalekiego Wschodu jest próbą odpowiedzi na zapotrzebowanie integracji środowiska naukowego, zajmującego się teologią i duchowością Dalekiego Wschodu. Niniejsza publikacja jest zaproszeniem do współpracy.