Analysis of a diverse cross‐sample of plant‐insect interactions suggests that the abundance of vitamin C (L‐ascorbic acid, ascorbate or AsA) in plants influences their susceptibility to insect feeding. These effects may be mediated by AsAs roles as an essential dietary nutrient, as an antioxidant in the insect midgut, or as a substrate for plant‐derived ascorbate oxidase, which can lead to generation of toxic reactive oxygen species. Ascorbate can also influence the efficacy of plant defenses such as myrosinases and tannins, and (...) alter insects' susceptibility to natural enemies. Conversely, herbivores appear to influence both de novo synthesis and redox cycling of AsA in their host plants, thereby potentially altering the nutritional value of crops and their susceptibility to pests. The recent development of genetically modified crops with enhanced AsA content provides both an impetus and a tool set for further studies on the role of AsA in plant‐insect interactions. (shrink)

O objetivo do texto é problematizar a existência de um possível pensamento informacional ibero-americano. Para tanto, inicialmente constata-se uma relativa ausência da Ibero-América nas apresentações e mapeamentos internacionais da ciência da informação. A seguir, é discutida a realidade dos 22 países que compõem a Ibero-América, região que pode ser compreendida a partir de uma perspectiva sociocultural e geopolítica. Logo após, é feito um panorama, ainda em estágio inicial, das pesquisas em ciência da informação destes países, ressaltando-se a necessidade de continuidade (...) e aprofundamento desse mapeamento. Por fim, apresenta-se uma configuração epistemológica geral da ciência da informação, em nível mundial, evidenciando-se a importância de se situar, nesse quadro, as contribuições específicas da Ibero-América. (shrink)

The concept of sustainable development is here revised in the light of a brief historical analysis, followed by a semantic analysis of the expressions development and sustainability. The authors criticize the common use of this concept in a loose way or in wide generalizations, to conclude, based on the principles of human ecology, that it is only possible to make it operational in limited spans of time and in limited spatial units.

The concept of sustainable development is here revised in the light of a brief historical analysis, followed by a semantic analysis of the expressions development and sustainability. The authors criticize the common use of this concept in a loose way or in wide generalizations, to conclude, based on the principles of human ecology, that it is only possible to make it operational in limited spans of time and in limited spatial units.

The concept of sustainable development is here revised in the light of a brief historical analysis, followed by a semantic analysis of the expressions development and sustainability. The authors criticize the common use of this concept in a loose way or in wide generalizations, to conclude, based on the principles of human ecology, that it is only possible to make it operational in limited spans of time and in limited spatial units.

El presente trabajo analiza la labor de difusión del patrimonio escénico que lleva a cabo el Centro de Investigación y Recursos de las Artes Escénicas de Andalucía (CIRAE) a través de las videograbaciones disponibles en Elektra, el Archivo Digital de las Artes Escénicas de Andalucía. Para ello se analiza una muestra de 84 videograbaciones siguiendo una metodología cuantitativo-descriptiva. Los resultados del análisis muestran carencias relevantes en el fondo documental videográfico del archivo. Así, la investigación concluye una serie de puntos de (...) mejora en la labor de difusión videográfica del patrimonio escénico andaluz llevada a cabo por el CIRAE. (shrink)

The ambiguous-cue task is composed of two-choice simultaneous discriminations involving three stimuli: positive (P), ambiguous (A) and negative (N). Two different trial types are presented: PA and NA. The ambiguous cue (A) served as an S- in PA trials, but as an S+ in NA trials. When using this procedure, it is typical to observe a less accurate performance in PA trials than in NA trials. This is called the ambiguous-cue effect. Recently, it was reported in starlings that the ambiguous-cue (...) effect decreases when the stimuli are presented on an angled (120°) panel. The hypothesis is that the angled panel facilitates that the two cues from each discrimination are perceived as a compound, precluding value transfer via a second-order conditioning mechanism. In this experiment, we used pigeons and a flat panel. Nevertheless, our data were quite similar to the previous data in starlings. We conclude that the form of the panel cannot explain the ambiguous-cue effect. Several alternatives to be explored in future experiments are suggested. The riddle of the ambiguous-cue problem still remains unsolved. (shrink)

RESUMEN El presente estudio está dirigido a establecer coincidencias entre el pensamiento de José Martí y de Carlos Marx en el terreno filosófico. Ambos representan los más altos exponentes del saber filosófico y humanista de la cultura europea y latinoamericana del siglo XIX, respectivamente, con un alcance genuinamente universal. No fue objetivo en modo alguno convertir a Martí en marxista, del mismo modo que sería absurdo afiliar a Marx a las ideas y las concepciones martianas. Sin embargo, no es (...) posible dejar de subrayar la profundidad del ideario martiano en el terreno filosófico, político, social y económico y sus aproximaciones a las concepciones marxistas o al socialismo científico. ABSTRACT The present study is directed to establish coincidences between the thought of José Martí and Carlos Marx in the philosophical area. Both are represented by the highest exponents of the philosophical and humanist knowledge of the European and Latin-American culture of the 19th century, respectively, with an authentically universal scope. It was not objective in any way to turn Martí into Marxist, in the same way that it would be absurd to affiliate Marx to the ideas and the Martí´s conceptions. Nevertheless, it is not possible to stop underlining the depth of the Martí´s ideology in the philosophical, political, social and economic area and his approaches to the Marxist conceptions or to the scientific socialism. (shrink)

RESUMEN El artículo responde algunas críticas planteadas por Ignacio Ávila a mi interpretación de la epistemología davidsoniana. Presento argumentos en contra de: a) que sea necesario distinguir entre representaciones epistemológicamente “peligrosas”e “inofensivas”; b) que el empirismo mínimo sea un tipo de realismo directo; c) que mi uso de la expresión “evidencia distal” y el interés por la teoría de la correspondencia sean asuntos ajenos a Davidson. Finalmente, sostengo que la triangulación es un elemento fundamental de la epistemología davidsoniana, pues permite (...) sortear la ansiedad realista manteniéndose en una postura no representacionalista. ABSTRACT In this article, I respond to some of Ignacio Ávila's criticisms of my interpretation of Davidson’s epistemology. I argue against: a) the need to distinguish between epistemologically “dangerous” and “harmless” representations; b) the idea that minimal empiricism is a kind of direct realism; and c) the claim that my usage of the expression “distal evidence” and interest in the theory of correspondence are issues that do not pertain to Davidson. Finally, I claim that triangulation is a key element in Davidsonian epistemology since it allows us to deal with the realist anxiety while maintaining a non-representationalist viewpoint. (shrink)

This title provides an overview of the atomic nucleus and the theories that seek to explain it. Bringing together a systematic explanation of hadrons, nuclei, and stars for the first time, the author provides the core material needed by students of physics to acquire a solid understanding of nuclear and particle science.

Este texto elabora un análisis metodológico y político de lo que implica pensar el discurso de los movimientos sociales en Colombia como lugar para comprender el conflicto político. Ello implica comenzar por una reflexión sobre lo que está juego en la política del lenguaje en la coyuntura histórica de lo que se ha dado en llamar la posverdad. Ante el reto de esta coyuntura, se propone la perspectiva de una ontología de lo político de corte posestructuralista como vía para articular (...) otros modos de comprender y ejercitar la veracidad y la responsabilidad en las prácticas del lenguaje. Siguiendo una relectura de la polémica dirigida por Habermas en contra de Foucault, y luego una interpretación de la lectura de Marx elaborada por Derrida, se propone una figura de la promesa, inseparable de la historicidad del lenguaje, como clave para pensar otros modos de la veracidad y la responsabilidad ético-política. Es desde esta otra figura de la promesa como configuradora de lo político, que se define la necesidad de una práctica teórico-filosófica del pensar-con las formas de enunciación de los movimientos y colectivos populares. (shrink)

Our purpose in this study – which stands at the crossroads of contemporary philosophy, anthropology, and religious studies – is to assess critically the plea for radical contingency in contemporary thought, with special attention to the work of Meillassoux, in light, among other things, of the symptomatic presence of Pauline motifs in the late twentieth to early twenty first-century philosophical arena, from Vattimo to Agamben and especially Badiou. Drawing on Aristotle’s treatment of τύχη and Hilan Bensusan’s neo-monadology (as well as (...) on the network biology of David George Haskell, Scott Gilbert’s holobiont hypothesis, and Terrence Deacon’s teleo-dynamics), we ask what is missing in such plea, from a theoretical standpoint. Next, we examine the relation between radical contingency and worldlessness in dialogue with Leroi-Gourhan’s theory of biocultural evolution, Lévi-Strauss’s structural anthropology, Pierre Clastres’s ethnography, Heidegger’s philosophy of language, and contemporary authors like Eduardo Viveiros de Castro and Patrice Maniglier. These two parallel lines of inquiry help us explore what radical contingency, in turn, prevents us from thinking: the intersection of ontology, cosmopolitics, and modality. (shrink)

En este texto se discuten los principales desarrollos de Alain Badiou en cuanto a las aportaciones de las matemáticas a una ontología materialista de lo múltiple, desde una perspectiva platónica; a través de éstas Badiou pretende enfrentar el reto que implica la antifilosofía de Jacques Lacan. Posteriormente, con base en la crítica que Slavoj Žižek realiza a las nociones de presentación y representación de Badiou, se juzgan los límites y las posibilidades de su propuesta ontológica.

Presentamos en este escrito la doctrina sufi relativa a la teleonomía y expresión divinas y al modo en que los hombres son interpelados por su actividad, luz, y beneficencia, con especial atención a la obra de Muhyi'd-din Ibn al-`arabi y conforme a los contenidos de una enseñanza que remite, asimismo, al horizonte temprano del pensar occidental. Querríamos contribuir con ello a esclarecer, desde una óptica filosófica, algunos de los motivos preliminares de la teoreticidad característica de la espiritualidad islámica.

This book recovers Dionysus and Apollo as the twin conceptual personae of life's dual rhythm in an attempt to redesign contemporary theory through the reciprocal affirmation of event and form, earth and world, dance and philosophy.

Según Oliver Marchart, autores como Badiou, Lefort, Rancière o Laclau son parte de una misma corriente: el pensamiento político posfundacionalista. Su caracte-rística central no es el rechazo de todo fundamento del orden político, sino de todo fundamento que pretenda ser necesario. En oposición a esta postura y, a partir de un análisis del concepto de hegemonía, se busca mostrar cómo el pensamiento de Laclau no se libra de la metafísica, sino que, por el contrario, desarrolla políticamente la que es -según (...) Heidegger, el padre espiritual del posfundacionalismo- su forma consumada: la metafísica nietzscheana de la voluntad de poder. According to Oliver Marchart, authors such as Badiou, Lefort, Rancière or Laclau are representatives of postfoundationalist political thought, which does not reject all foundations of the political order, but rather those that claim to be necessary. In opposition to this viewpoint and on the basis of an analysis of the concept of hegemony, the paper seeks to show how Laclau's thought fails to free itself of metaphysics. Rather, it develops politically that which according to Heidegger, the "spiritual father" of postfoundationalism, is its consummated form: Nietzsche's metaphysics of the will to power. (shrink)

This article aims at contributing to the contemporary reception of Heidegger’s thought in eco-philosophical perspective. Its point of departure is Heidegger’s claim, in his Bremen lectures and The Question Concerning Technology, that today the earth is submitted to permanent requisition and planned ordering, and that, having thus lost sight of its auto-poiesis, we are no longer capable of listening, tuning in, and singing back to what he calls in his course on Heraclitus the “song of the earth.” Accordingly, first we (...) examine how the inherently reciprocal dynamics of “earth” and “world,” as thematised by Heidegger in The Origin of the Work of Art, have become opaque. Second, we analyse whether it is possible to find those same dynamics at play behind Heidegger’s “Fourfold,” which we propose to reread in binary key in dialogue with contemporary anthropology, from Bateson and Lévi-Strauss to Wagner and Viveiros de Castro, and in light of Guattari’s notion of “trans-entitarian generativity.” Third, we stress the need to reposition Heidegger’s thought alongside contemporary concerns on “worlding” and we explore its plausible intersections with today’s object-oriented ethnography. Lastly, we discuss the possibility of rereading Heidegger’s Fourfold afresh against the backdrop of Heidegger’s non-foundational thinking, as a conceptual metaphor for the joint dynamics of Abgrund and Grund. (shrink)

It is proposed that there are at least two categories of blindsight. One is present in visually guided behaviour in normals as well as in brain-damaged patients, while the other is present only following cortical lesions. It is also proposed that blindsight is blind because residual visual functions are banned from consciousness either when they are subserved by subcortical centres alone or when they are mediated by cortical areas that have never been exclusively associated with such functions before brain injury.

1. Ser y estar -- 2. Ciencia y sabiduría-- 3. Yo y nosotros.

William Parry conceived in the early thirties a theory of entail-
ment, the theory of analytic implication, intended to give a formal expression to the idea that the content of the conclusion of a valid argument must be included in the content of its premises. This paper introduces a system of analytic, paraconsistent and quasi-classical propositional logic that does not validate the paradoxes of Parry’s analytic implication. The interpretation of the expressions of this logic will be given in terms of a (...) four-valued semantics,and its proof theory will be provided by a system of signed semantic tableaux that incorporates the techniques developed to improve the efficiency of the tableaux method for many-valued logics.
1. Introduction. (shrink)

Las nociones de "uno" y de "múltiple" han sido, históricamente, objeto de tratamiento, a la vez, filosófico y teológico. En el contexto de la filosofía islámica oriental, y en el marco de su vertiente más específicamente neoplatónica, el "Príncipe de los Teósofos", Sadrâ ¿irâzi (ob.1050/1640), estudia ambas desde una perspectiva ontológica y distanciándose del enfoque consignado al respecto por los filósofos peripatéticos del Islam. Adaptando y continuando, de un lado, la gnosis de Ibn al-'ArabÌ, y, de otro, la sabiduría iluminativa (...) de Sohravardi, Mollâ Sadrâ discute la distinción aviceniana entre un Ser Necesario y una multiplicidad de seres posibles, así como la posibilidad de considerar accidental la realidad de la existencia. Basado en la coimplicación de tres conceptos fundamentales: iîªlat al-wuÿñd (prioridad del ser), waÊdat al-wuÿñd (unidad del ser) y ta¿kÌk (diferenciación y gradación intensiva del ser), el univocismo monadológico de Sadrâ puede, por otra parte, permitirnos reevaluar ciertas cuestiones filosóficas que pugnan por ser examinadas hoy a una nueva luz. (shrink)

Este artículo examina algunos de los problemas que presenta el tratamiento lógico de las obligaciones prima facie en la obra de Carlos Alchourrón. Por una parte, señalaremos que su sistema para los condicionales derrotables DFT no formaliza adecuadamente la noción intuitiva de condición contribuyente que Alchourrón utiliza para elucidar la de condicional derrotable. Por otra parte, argumentaremos que la noción de deber prima facie de David Ross no queda adecuadamente formalizada en el sistema AD de lógica deóntica que Alchourrón (...) construye como una extensión de DFT. This paper deals with some problems concerning the logical treatment of prima facie obligations in the work of Carlos Alchourrón. On the one hand, we will argue that his DFT system for defeasible conditionals does not adequately formalize the intuitive notion of contributory condition used by Alchourrón to elucidate the notion of defeasible conditional. On the other hand, we will argue that David Ross' notion of prima facie duty is not adequately formalized in Alchourrón' s deontic system AD, an extension of his DFT logic. (shrink)

Shadows are intriguing phenomena. They do not have mass or energy. So, they are unable to have some basic characteristics of the objects of which they are shadows: they cannot move by themselves and they cannot experience the same kind of changes. At first sight, any theory of perception can skip this optical phenomenon or look at it only as a side-effect. Actually, in order to be seen objects must be illuminated and one of the consequences of this is that (...) they project a shadow over the surrounding space. Is that all? In this paper I will argue that, from a phenomenological point of view (or at least from a Husserlian oriented phenomenology), shadows, with their specific hyletic data, must be considered as an element of the process of constitution of spatial-temporal objectivities. In other words, shadows no less than other predicates, like extension or hardness, although in a different manner, belong to the a priori structure of those objectivities. This means that their ontological status is quite different from that of fictitious objects or hallucinations. To show this I will draw mainly in Husserl’s Lesson Thing and Space, from 1907, and other unpublished texts during Husserl’s lifetime, like the second volume of the Ideas and the Lesson of 1925 on Psychological Phenomenology. (shrink)

En este texto se analizan los motivos gastronómicos de la obra del escritor japonés Junichiro Tanizaki, con el fin de discutir sus implicaciones estéticas y metafísicas. Para ello, se ofrece una breve semblanza del autor y se plantea la problemática de cómo interpretar sus textos, en un marcado contraste con la hermenéutica filosófica de corte occidental, y en función de una digresión filosófica sobre las nociones de utopía y heterotopía de Paul Ricœur y Michel Foucault.

It is usually accepted in the literature that negation is a contradictory-forming operator and that two statements are contradictories if and only if it is logically impossible for both to be true and logically impossible for both to be false. These two premises have been used by Hartley Slater [Slater, 1995] to argue that paraconsistent negation is not a “real” negation because a sentence and its paraconsistent negation can be true together. In this paper we claim that a counterpart of (...) Slater´s argument can be directed against the negation operator of classical logic. Carnap’s discovery that there are models of classical propositional logic with non-standard or non-normal interpretations of the connectives will be used to build such an argument. One such non-normal valuation which can be added to the set of classically admissible valuations without altering the set of theorems or the set of valid consequences assigns true to every well-formed formula and, therefore, assigns a designated value to every formula and its negation. We ponder the consequences of these arguments for the claims that paraconsistent negations are not genuine negations and that the negation of classical logic is a contradictory-forming operator. (shrink)

En esta nota, el autor recuerda cómo Santo Tomás de Aquino se ha ocupado del problema de los universales, señala los textos más importantes en que aborda tal cuestión y formula algunas observaciones en torno a ellos. Finalmente, traduce al portugués uno de estos textos.