Daniel Ballesteros - Academia.edu (original) (raw)

Papers by Daniel Ballesteros

Sociedad Colombiana de Cardiologia, Jan 8, 2005

Introducción El infarto del miocardio en el paciente joven menor de 45 años, es poco frecuente y ... more Introducción El infarto del miocardio en el paciente joven menor de 45 años, es poco frecuente y tiene una incidencia menor al 10% del total de los infartos. Como etiología se asocia más frecuentemente con enfermedad aterosclerótica y consumo de cigarrillo. Tiene un pronóstico más favorable en comparación con el infarto en personas mayores.

The Principality of Asturias (or simply Asturias) is a region located in the North of Spain (SW o... more The Principality of Asturias (or simply Asturias) is a region located in the North of Spain (SW of Europe) limited by the Cantabrian Sea in the North and the Castilla y Leon, Cantabria and Galicia regions in the South, East and West respectively. The Asturias Coast represents around 30% of the Cantabrian Coast, the northern limit of the Iberian Peninsula, and is surrounded by the Cantabrian Sea. This sea represents the transition of the Atlantic Ocean to the Biscay Gulf, between Spain and France. Towards the South, the Cantabrian Coast is limited by the Cantabrian Mountains, up to 2,648 m altitude, which axis is located only at 20–50 km from the sea.

Journal of Analytical Atomic Spectrometry

A procedure for the measurement of 87Sr/86Sr in carbonates without off-line strontium separation ... more A procedure for the measurement of 87Sr/86Sr in carbonates without off-line strontium separation was developed, validated and applied to Normandy chalkstones. The method is based on the injection of the...

20th Congress of the International Union for Quaternary Research (INQUA) in Dublin, Ireland, 25-3... more 20th Congress of the International Union for Quaternary Research (INQUA) in Dublin, Ireland, 25-31 july 2019

Plants

There is a pressing need to conserve plant diversity to prevent extinctions and to enable sustain... more There is a pressing need to conserve plant diversity to prevent extinctions and to enable sustainable use of plant material by current and future generations. Here, we review the contribution that living collections and seed banks based in botanic gardens around the world make to wild plant conservation and to tackling global challenges. We focus in particular on the work of Botanic Gardens Conservation International and the Millennium Seed Bank of the Royal Botanic Gardens, Kew, with its associated global Partnership. The advantages and limitations of conservation of plant diversity as both living material and seed collections are reviewed, and the need for additional research and conservation measures, such as cryopreservation, to enable the long-term conservation of ‘exceptional species’ is discussed. We highlight the importance of networks and sharing access to data and plant material. The skill sets found within botanic gardens and seed banks complement each other and enable th...

Geoheritage

Caves are one of the most spectacular elements of karst with a high natural value, due to their s... more Caves are one of the most spectacular elements of karst with a high natural value, due to their singularity and high diversity of natural features. The Picos de Europa National Park (Spain) is a high mountain protected area that represents the highest density of deep caves of the World (12 deep caves/km2). This work analyses geoheritage linked to these caves as a part of broad projects to know and inventory the geological heritage of the Picos de Europa National Park. The methodology of work combines both geomorphological and geoheritage studies. Geomorphological study includes a caves inventory of the National Park, the characterization of the caves geomorphology and the selection of 14 caves with > 1-km depth as geosites, including an ice cave for its uniqueness. The geoheritage study is based on a four-forms system formed by selected indicators following the pressure-state-response (PSR) model. In the short term, management measures proposed for the deep karst caves of the National Park include enhancing the scientific research focused on karst and groundwater flow evolution and the palaeoclimatic variations of the region including ice cave monitoring. In the medium term, it should be adequate to re-design the public use system for the regulation and control of the visits to the caves and to emphasise the outstanding nature of the geoheritage linked to the endokarst of the National Park. Finally, in the long term, it would be necessary to design a visit system for expert speleological groups.

La Sociedad Cotizada 2006 Isbn 84 9768 283 1 Pags 835 890, 2006

Arch Argent Dermatol, Apr 1, 1998

Los anticuerpos anticitoplasma de neutrofilo (ANCA) constituyen un grupo de inmunoglobinas dirigi... more Los anticuerpos anticitoplasma de neutrofilo (ANCA) constituyen un grupo de inmunoglobinas dirigidas contra las enzimas contenidas en los granulos de los polimorfonucleares neutrofilos y monocitos. Los ANCA son maracadores serologicos de diversas enfermedades vasculiticas de vasos pequenos y medianos, granulomatosas o no. Por inmunofluorescencia indirecta, se identifican 2 subtipos principales de ANCA: citoplasmatico (C ANCA) y perinuclear (P ANCA). Los C ANCA son hallados principalmente en la vasculitis granulomatosa de wegener (E.W.). Se han detectado C ANCA en otros procesos vasculiticos y no vasculiticos: poliarteritis microscopica, enfermedad de Churg Strauss, panarteritis nodosa, sindrome de Sweet, fibroquistosis, fibrosis pulmonar, procesos infecciosos y neoplasicos y en pacientes VIH positivos. La participacion de C ANCA en estos cuadros es variable e infrecuente. Los P ANCA se vinculan a vasculitis limitada al rinon y a vasculitis sistemicas no granulomatosas. Los P ANCA son marcadores menos sensibles y especificos. Se los encuentra asociados principalmente a poliarteritis microscopica (PM), Churg Strauss y vasculitis limitadas al rinon. Se presentan dos casos representativos ANCA positivos: una E.V. y una P.M. El verdadero valor de los ANCA como marcadores de enfermedades vasculiticas o como indices de su actividad no esta definitivamente establecido, excepcion hecha de la E.W. donde la especificidad para C ANCA es del 90 al 100 por ciento

Environmental Earth Sciences, 2015

Abstract Karst aquifers are valuable groundwater resources whose management requires the use of f... more Abstract Karst aquifers are valuable groundwater resources whose management requires the use of functioning hydrogeological models. The KARSYS approach provides an explicit 3D conceptual model of the geometry and the functioning of karst aquifers that has been successfully applied in Swiss and Slovenian aquifers. In this work, KARSYS is applied in a complex geological area: the Picos de Europa National Park (Spain). The hydrogeological 3D model (500 km2) shows an alpine karst aquifer compartmentalized into 32 groundwater bodies dammed up by subvertical barriers creating elevated saturated zones (water tables at 1153 m asl) and lower ones (water tables at 145 m asl). The recharge is through 18 spring catchment areas. The groundwater flows to the saturated zones pass through vertical to inclined trajectories, and phreatic flows are oriented toward NW, NE and N. KARSYS can be applied to any geologically complex area at a regional scale, although the geological structure should be simplified and the precision in some places is low. Nevertheless, KARSYS helps to identify the hydrogeological behavior of karst areas and is a useful guide for future hydrogeological researches.

European Journal of Cancer Supplements, 2003

World Geomorphological Landscapes, 2014

The E–W trending Cantabrian Mountains, with peaks more than 2,600 m a.s.l., are located along the... more The E–W trending Cantabrian Mountains, with peaks more than 2,600 m a.s.l., are located along the northern coast of the Iberian Peninsula. After the development of south-verging structures during the Alpine Orogeny, the Cantabrian Mountains were arranged as an asymmetrical relief deeply dissected by the fluvial network, with steep rivers flowing into the Cantabrian Sea in the north and less steep rivers draining towards the Duero Tertiary Basin to the south. The area shows a high geomorphic diversity, including relict Quaternary glacial and periglacial landforms, as well as features related to slope instability, fluvial and karstic processes. This work summarizes the geomorphological features of two different protected areas of the Cantabrian Mountains designated as Picos de Europa: the Picos de Europa National Park and the Picos de Europa Regional Park. Both are representative areas of the high-mountain landscapes of the northern and southern sectors of the Cantabrian Mountains. Moreover, the former hosts good examples of underground alpine karst.

Plant Science, 2010

Seeds die inevitably but unexpectedly during storage and current understanding of seed quality an... more Seeds die inevitably but unexpectedly during storage and current understanding of seed quality and storage conditions do not allow reliable means to predict or prevent this critical problem. Chemical degradation of seed components likely occurs through oxidative damage, but the rate of these reactions is dominated by properties of seed that are affected by temperature and moisture. These visco-elastic properties contribute to the structure of seeds as amorphous solids. This paper presents the perspective of seed maturation and post-harvest treatment as an exercise in engineering design for a structure that must persist through time and fluctuating conditions. Structural analyses are engineering tools used to select proper composition of materials and predict their behavior under a range of circumstances and are applicable to measurement within seeds. Thermal mechanical analysis (TMA) and dynamic mechanical analysis (DMA) measure structural deformation and stress-strain relationships, providing sensitive and universal parameters that detect differences in structural stability in materials with subtle compositional differences or processing methods. When applied to seeds, TMA and DMA techniques provide information consistent with existing information on glass and first order transitions. The depth of additional information obtainable about the behavior of the glass and interactions with lipid structure suggests that these techniques will be able to quantify differences among seed structures that contribute to their tendency to age.

Journal of Hospital Infection, 2004

Journal of Critical Care, 2010

We studied patients requiring mechanical ventilation for more than 48 hours who died in the inten... more We studied patients requiring mechanical ventilation for more than 48 hours who died in the intensive care unit and whose bodies were autopsied. We evaluated 3 clinical definitions of ventilatorassociated pneumonia: loose definition, defined as chest radiograph infiltrates and 2 of 3 clinical criteria (leukocytosis, fever, purulent respiratory secretions); rigorous definition, defined as chest radiograph infiltrates and all of the clinical criteria; and a clinical pulmonary infection score higher than 6 points. Sensitivity, specificity, and likelihood ratios were calculated by using pathology pattern as criterion standard. Results: One hundred forty-two (56%) of the 253 patients included had histological criteria of pneumonia. Patients who met the clinical criteria of ventilator-associated pneumonia were 163 (64%) for the loose definition, 32 (13%) for the rigorous definition, and 109 (43%) for the clinical pulmonary infection score. The operative indexes (sensitivity and specificity) of each definition were as follows: loose definition, 64.8% and 36%; rigorous definition, 91% and 15.5%; and clinical pulmonary infection score higher than 6, 45.8% and 60.4%. The addition of microbiological data to the clinical definitions increased the specificity and decreased the sensitivity but not significantly. Conclusions: Accuracy of 3 commonly used clinical definitions of ventilator-associated pneumonia was poor taking the autopsy findings as reference standard.

American Journal of Botany, 2012

Advances in Research in Karst Media, 2010