Estudio mineralógico de arcillas cerámicas de la provincia de Zamora III. Yacimientos en el basamento paleozoico

The mineralogical propiertes of 15 samples from 8 ceramic deposits of the province oh Zamora have been studied. The deposit are localized in the Paleozoic. The tecniques useid were: cation-exchange capacity, chemical analysis, differential thermal analysis, therrnogravimetric analysis and X-ray diffraction. It is concluded that the samples from deposits XX and XXII are composed, mainly, by illite (60-80 %) and kaolinite (20-40 %). The other samples contain illite (20-60 %), kaolinite (10-40 %) and montmorillanite (15-50 %)

A characterization of non-archimedeanly quasimetrizable spaces

In this paper we introduce a new structure on topological spaces which allows us to give a characterization of non-archimedeanly quasipseudometrizable spaces

La cabra mallorquina

Resumen de la comunicación presentada al III Congreso Ibérico sobre Recursos Genéticos Animale

Un nuevo índice para caracterizar el estado de conservación de las praderas de Posidonia oceanica (L.) Delile

Se presenta el índice de alteración, un índice que sirve para caracterizar el estado de conservación de las praderas de Posidonia

Spatial and temporal variability of CO2 emisions in soils under conventional tillage and no-till farming

Agricultural soils can act as a carbon sink depending on the soil management practices employed. As a result of this functional duality, soil management systems are present in international documents relating to climate change mitigation. Agricultural practices are responsible for 14% of total greenhouse gas emissions (GHG’s) (MMA, 2009)(1). Conservation agriculture (CA) is one of the most effective agricultural systems for reducing CO2 emissions, as it increases the sequestration of atmospheric carbon in the soil. In order to assess the performance of CA in terms of CO2 emissions, a field trial was conducted comparing soil derived CO2 fluxes under No-till (NT) farming and under conventional tillage. Three pilot farms were selected in the cereal-growing area of southern Spain, located in Las Cabezas de San Juan (Seville), Carmona (Seville) and Cordoba. Each pilot farm comprises six experimental plots with an approximate area of five hectares; three of the six plots implement CA practices, while the other three use conventional tillage techniques. The subdivision of each tillage system into 3 plots allowed the simultaneous cropping of the three crops of the wheat-sunflower-legume rotation each year. Results showed that carbon dioxide emissions were 31 to 91% higher in tilled soils than in untilled soils, and that there was a great seasonal variability of CO2 emissions, as weather conditions also differed considerably for the different sampling periods. In all cases, the CO2 fluxes emitted into the atmosphere were always higher when soil was subject to conventional tillage

La seca de encinas y alcornoques en Andalucía : decaimiento y enfermedad

El decaimiento forestal es una enfermedad de etiología compleja, resultado de la acción de un número variable de factores bióticos y abióticos que causan un deterioro gradual y general de los árboles afectados, hasta su muerte. Los factores implicados en el decaimiento de los Quercus en Andalucía son factores predisponentes de tipo selvícola, alteraciones climáticas como factor incitante, y plagas y enfermedades como factores contribuyentes. Entre las enfermedades implicadas en Seca de los Quercus destacan, por orden de importancia, la podredumbre radical causada por Phytophthora cinnamomi, los chancros de tronco y ramas causados por Botryosphaeria spp. y el chancro carbonoso causado por Biscogniauxia mediterranea. No obstante, las dos primeras enfermedades tienen una especial incidencia en distintas zonas de Andalucía de forma independiente, no asociadas al decaimiento. En el presente artículo se exponen las medidas de control disponibles contra estas enfermedades de los Quercus y se plantea la necesidad de disponer de un diagnóstico preciso en cada caso para abordar dicho control con garantías, ya que no cabe encontrar soluciones únicas que resulten eficaces con independencia de la naturaleza del problema._____________________________________The forestry decline is a complex disease, as a result of the action of a changeable number of biotic and abiotic factors that cause a gradual and general deterioration of the affected trees, until their death. The factors involved in the Quercus decline in Andalusia are predisposing factors like silvic, climatic alterations as inciting factor, and insect pest and diseases as contributing factors. Between the diseases involved in oak decline stand out, in order of importance, the root roting caused by Phytophthora cinnamomi, the chancres of trunk and branches caused by Botryosphaeria spp. and the charcoal canker caused by Biscogniauxia mediterranea. Nevertheless, the first two diseases have a special effect on different zones of Andalusia in different ways, not associated with the decay. In this article we expose the available tools of disease control. We emphasizes the need of having a precise diagnosis in every case to approach the control with guarantees, since there is no chance of finding only one efficient solution regardless of the nature of the problem

El control de los criterios de higiene de los procesos en mataderos de cerdo ibérico como medio para evaluar el funcionamiento aceptable de la producción

La normativa vigente obliga a los mataderos de cerdo ibérico a desarrollar e implantar un plan APPCC (Análisis de Peligros y Puntos de Control Crítico). De igual modo deben comprobar el correcto funcionamiento de su proceso de producción realizando controles microbiologícos de la superficie de las canales, siguiendo un plan de muestreo diseñado de acuerdo al Reglamento 2073/2005. En el presente trabajo se expone el diseño de un plan de muestreo de un matadero de cerdo ibérico, y se muestran los resultados obtenidos en los primeros controles realizados siguiendo dicho plan

Controles analíticos realizados en una pequeña industria elaboradora de quesos de oveja y su papel en el contexto de la garantía de inocuidad de los productos elaborados

Como parte de las actuaciones encaminadas a asegurar la inocuidad de los quesos, las industrias elaboradoras de quesos deben comprobar la ausencia de antibióticos en la leche que utilizan como materia prima, así como la calidad microbiológica de ésta. Igualmente deben llevar a cabo controles microbiológicos de los quesos que ponen en el mercado. El presente trabajo muestra el modo en que lleva a cabo estos controles una industria elaboradora de queso de oveja, así como la comparación de los resultados obtenidos en los mencionados controles durante el año 2006 con los criterios establecidos en la normativa vigente

Effect of Oak Chip Addition at Different Winemaking Stages on Phenolic Composition of Moravia Agria Red Wines

This study compared changes in the phenolic composition of Moravia Agria wine and its effect on colour,co-pigmentation as well as on physicochemical properties, such as antioxidant capacity, caused by addingoak chips at different stages of the winemaking process. Moravia Agria control wine was made followingtraditional winemaking processes, without oak chips. Oak chips were added to the rest of the wines attwo dose rates (3 and 6 g/L) at different stages of the winemaking process: for one week during alcoholicfermentation, during malolactic fermentation and in young red Moravia Agria wine. Only slight significantdifferences were found in phenolic composition, antioxidant activity and chromatic characteristics betweenthe Moravia Agria wines treated with oak chips and the control wine. However, oak chip addition slightlydecreased the content of non-polymeric red pigments (monomeric anthocyanins and pyranoanthocyanins)and also of resveratrol-monomer stilbenes. It is suggested that oak chip addition to Moravia Agria winescan be selected as part of the targeted sensory profile (relative intensity of sensory descriptors providedby grape and oak wood), since only a few changes have been observed in the phenolic profiles, antioxidantcapacity value and colour characteristics

Introducing fractal dimension algorithms to calculate the Hurst exponent of financial time series

In this paper, three new algorithms are introduced in order to explore long memory in financial time series. They are based on a new concept of fractal dimension of a curve. A mathematical support is provided for each algorithm and its accuracy is tested for different length time series by Monte Carlo simulations. In particular, in the case of short length series, the introduced algorithms perform much better than the classical methods. Finally, an empirical application for some stock market indexes as well as some individual stocks is presented