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Search Results: 1 - 10 of 31775 matches for " Juan Barja "
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La enfermedad mortal
Juan Barja
Política y Sociedad , 2000, DOI: -
Abstract: Sin resumen
On the bicanonical map of irregular varieties
Miguel Angel Barja,Martí Lahoz,Juan Carlos Naranjo,Giuseppe Pareschi
Mathematics , 2009,
Abstract: From the point of view of uniform bounds for the birationality of pluricanonical maps, irregular varieties of general type and maximal Albanese dimension behave similarly to curves. In fact Chen-Hacon showed that, at least when their holomorphic Euler characteristic is positive, the tricanonical map of such varieties is always birational. In this paper we study the bicanonical map. We consider the natural subclass of varieties of maximal Albanese dimension formed by primitive varieties of Albanese general type. We prove that the only such varieties with non-birational bicanonical map are the natural higher-dimensional generalization to this context of curves of genus 2: varieties birationally equivalent to the theta-divisor of an indecomposable principally polarized abelian variety. The proof is based on the (generalized) Fourier-Mukai transform.
Dermatology Eponyms – sign –Lexicon (H)
Piotr Brzeziński,Larissa Pessoa,Virgilio Galv?o,Juan Manuel Barja Lopez
Our Dermatology Online , 2013,
Abstract: Eponyms are used almost daily in the clinical practice of dermatology. And yet, information about the person behind the eponyms is difficult to find. Indeed, who is? What is this person’s nationality? Is this person alive or dead? How can one find the paper in which this person first described the disease? Eponyms are used to describe not only disease, but also clinical signs, surgical procedures, staining techniques, pharmacological formulations, and even pieces of equipment. In this article we present the symptoms starting with (H). The symptoms and their synonyms, and those who have described this symptom or phenomenon.
Xiao's conjecture for general fibred surfaces
Miguel ángel Barja,Víctor González-Alonso,Juan Carlos Naranjo
Mathematics , 2014,
Abstract: We prove that the genus $g$, the relative irregularity $q_f$ and the Clifford index $c_f$ of a non-isotrivial fibration $f$ satisfy the inequality $q_f \leq g - c_f$. This gives in particular a proof of Xiao's conjecture for fibrations whose general fibres have maximal Clifford index.
Are Motorways Potential Stressors of Roadside Wood Mice (Apodemus sylvaticus) Populations?
álvaro Navarro-Castilla, Cristina Mata, Pablo Ruiz-Capillas, Rupert Palme, Juan E. Malo, Isabel Barja
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0091942
Abstract: Linear infrastructures represent one of the most important human impacts on natural habitats and exert several effects on mammal populations. Motorways are recognized as a major cause of habitat fragmentation and degradation and of biodiversity loss. However, it is unknown whether motorways lead to increased physiological stress reactions in wild animal populations. We analysed faecal corticosterone metabolites (FCM) in wild populations of wood mice (Apodemus sylvaticus) living in a well-preserved Mediterranean agro-pastoral woodland at different distances (verge, 500 m and 1000 m) from the AP-51 motorway in Spain. Wood mice were captured with Sherman live traps, and fresh faecal samples from 424 individuals were collected and analyzed in the laboratory. The quantification of FCM was performed by a 5α-pregnane-3β,11β, 21-triol-20-one enzyme immunoassay. Results showed that females had higher FCM levels than males, and these levels were higher in breeding females. In addition, FCM levels were positively correlated with body weight of individuals. Wood mice captured where cattle were present showed higher FCM levels than individuals living where cattle were not detected. FCM levels were higher in non-breeding individuals living close to the motorway compared with FCM levels in those individuals captured further from the motorway. This is the first study showing evidence of the motorways' impact on physiological stress reactions in wild wood mice populations. Understanding how free-living animals are influenced by human interventions could help to understand other subtle changes observed in wild animal populations. Since mice are used world-wide as research models these results could open new perspectives testing human influence on the natural environment and trade-offs of species in degraded ecosystems.
Alimentación en el colegio
Salesa Barja Y.
Revista chilena de pediatría , 2005,
Generalized Clifford-Severi Inequality and the Volume of Irregular Varieties
Miguel A. Barja
Mathematics , 2013, DOI: 10.1215/00127094-2871306
Abstract: We give a sharp lower bound for the selfintersection of a nef line bundle $L$ on an irregular variety $X$ in terms of its continuous global sections and the Albanese dimension of $X$, which we call the Generalized Clifford-Severi inequality. We also extend the result to nef vector bundles and give a slope inequality for fibred irregular varieties. As a byproduct we obtain a lower bound for the volume of irregular varieties; when $X$ is of maximal Albanese dimension the bound is $Vol(X) \geq 2 n! \chi\omega_X$ and it is sharp.
Numerical bounds of canonical varieties
Miguel A. Barja
Mathematics , 1999,
Abstract: We study lower bounds for the self-intersection of the canonical divisor of "canonical varieties" (i.e. varieties whose canonical linear system gives a birational map). We give some improvements for the known results in the case of surfaces and new bounds for the case of canonical threefolds.
Lower bounds of the slope of fibred threefolds
Miguel A. Barja
Mathematics , 1999,
Abstract: We study from a geographical point of view fibrations of threefolds over smooth curves, such that the general fibre is of general type. We prove the non-negativity of certain relative invariants under general hypotheses and give lower bounds for the self-interssection of the relative canonical divisor of the fibration, depending on other relative invariants. We also study the influence of the relative irregularity on these bounds. A more detailed study of the lowest cases of the bounds is given.
Debe efectuarse la ablación en todo paciente con síndrome de Wolff-Parkinson-White asintomático?
Luis D. Barja,Jorge Scaglione
Revista Argentina de Cardiología , 2007,
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