The objective of this study was to isolate endophytic bacteria from roots of Brachiaria humidicola cv. humidicola (Rendle) Schweick and to relate their presence to pH, organic matter and phosphorus contents of the soil of cattle farms located in the municipality of San Benito Abad. Soil sampling was carried out with roots of B. humicola for the isolation and counting of the population density of endophytic bacteria and soil samples were also collected for the determination of pH, organic matter and (...) phosphorus parameters. The results found indicate that there is an amount of endophytic bacteria in roots of B. humidicola when the soil contains optimum pH values of (6.1 ± 6.98); low to moderate phosphorus content (10.8 ± 16.28 mg/kg) and low to moderate organic matter content (1.7 ± 2.31%). The presence of endophytic bacteria was observed in a range of 3.0 ± 8.0 X 106 CFU/g of roots. There is a worldwide need to establish a relationship between endophytic bacteria and soil physical-chemical quality indicator parameters to predict a change in functional diversity under physical, chemical and biological conditions of the soil ecosystem. (shrink)

Cadmium (Cd) is one of the most toxic heavy metals. Its high mobility and bioaccumulation power in plant, animal and human tissues differentiate it from the rest of its group and motivate the interest of scientists to know its effects and interaction with plants and the environment. The aim of the present study was to isolate and evaluate the in vitro tolerance of rhizospheric bacteria associated with rice plants in cadmium-contaminated environments and to evaluate them in vitro capacity to tolerate (...) cadmium and the production of compounds related to their ability to remediate and promote plant growth. Rhizospheric bacteria were isolated, tolerance was found up to 500 mg/L CdCl2 and the ability to produce siderophore and solubilize phosphate at this concentration of cadmium was observed in vitro. The morphospecies with the ability to tolerate cadmium up to 500 mg/L found corresponds to Pseudomonas aeruginosa GU270941.1, a species of rhizospheric bacteria that shows an alternative to reduce cadmium uptake by rice plants and promote the growth of these plants for their adaptation and tolerance to this metal. (shrink)

Understanding the interaction of Cd with plants, as well as the search for alternatives to minimize its effects, has caught the interest of the scientific community, due to the accelerated growth of contamination with this metal and its high toxicity. The aim of the present study was to evaluate the ability of two rhizospheric bacterial strains LC7504001.1 Burkholderia cepacia (C65RLIM) and FJ972527.1 Pseudomonas aeruginosa (C85RLIM) to three concentrations of cadmium (100, 300 and 500 mg/L) and to compare the growth behaviour (...) with increasing temperature from 32 to 45°C. The results show different growth patterns for each strain tested against exposure to the three cadmium concentrations and the four temperatures tested. The Pseudomonas aeruginosa strain (C85RLIM) had the best adaptive behaviour to the three cadmium concentrations tested, and also showed stability when subjected to 500 mg/L CdCl2 and temperatures between 40 and 45°C. The results predict the possible behaviour of rhizospheric bacteria in the face of global warming and heavy metal remediation processes. (shrink)

Summary: Responding to Laudan’s skeptical reading of history an influential group of realists claim that the seriously wrong claims past successful theories licensed were not really implicated in the predictions that once singled them out as successful. For example, in the case of Fresnel’s theory of light, it is said that although he appealed to the ether he didn’t actually need to in order to derive his famous experimental predictions—in them, we are assured, the ether concept was “idle,” “inessential,” “peripheral” (...) or worse. This view, developed by J. Worrall and P. Kitcher in the 1980s and subsequently supplemented by J. Leplin and by S. Psillos has received critical attention in the literature over the last decade, but more needs to be said on the subject—or so I suggest in this paper. I bring forward four converging argumentative lines to show how and why, from the days of Fresnel to at least the decade after the Michelson-Morley experiments, the ether functioned and was understood as an “essential” posit in physics. My first line draws Fresnel’s actual deployment of the ether concept and the way he and his circle understood the achievements of his theory. The second line draws is from epistemological assessments of surprising implication in theories and its impact on leading theorists in the last two-thirds of the century. The third line draws from discussions of the optical ether in end-of-century reports circa 1900. The fourth focuses on entrenched metaphysical assumptions that persisted in the practice of physics until the advent of special relativity. Pulling these four lines together shows, I think, why attempts at synchronic identification of sound theory-parts are bound to fail, and also how realists might try to meet the challenge this creates. (shrink)

Using the optical ether as a case study, this article advances four lines of consideration to show why synchronic versions of the divide et impera strategy of scientific realism are unlikely to work. The considerations draw from the nineteenth-century theories of light, the rise of surprising implication as an epistemic value from the time of Fresnel on, assessments of the ether in end-of-century reports around 1900, and the roots of ether theorizing in now superseded metaphysical assumptions. The typicality of the (...) case and its impact on diachronic versions of the strategy are briefly discussed. (shrink)

The first half of this article follows Mario Bunge’s early realist moves, his efforts to articulate the achievements of theoretical physics as gains in the quest for objective truth and understanding, particularly in the context of the fights against the idealist and subjectivist interpretations of quantum mechanics that, at least until the mid-1970s, prevailed in physics. Bunge’s answers to the problems of quantum mechanics provide a good angle for understanding how his realist positions grew on the “battlefield.” The second half (...) discusses Bunge’s general conception of the scientific realist stance and confronts it with some current approaches to realism in the mainstream literature. (shrink)

Recent attempts to turn Standard Quantum Theory into a coherent representational system have improved markedly over previous offerings. Important questions about the nature of material systems remain open, however, as current theorizing effectively resolves into a multiplicity of incompatible statements about the nature of physical systems. Specifically, the most cogent proposals to date land in effective empirical equivalence, reviving old anti-realist fears about quantum physics. In this paper such fears are discussed and found unsound. It is argued that nothing of (...) global skeptical or agnostic significance follows from the kind of underdetermination presently encountered in fundamental quantum theory. The case is instructive, however, for what it shows about the characteristics and prospects of scientific realism as a perspective in contemporary philosophy of science. (shrink)

Some thinkers distrust Darwinist explorations of complex human behaviors, particularly investigations into possible differences in valued skills between genders, races or classes. Such projects, it is claimed, tend to have adverse effects on people who are already disadvantaged. A recent argument by Philip Kitcher both clarifies and generalizes this charge to cover a whole genre of scientific projects. In this paper I try to spell out and analyze Kitcher's argument. The argument fails, I suggest, because some of its key premises (...) fail to convince. My analysis focuses on relevant facts about the role of inquiry in fallibilist contexts, the texture of belief in contemporary natural science, and the moral dimension of scientific research. (shrink)

According to an old way of thinking, any leve! of problematicity with respect to truth or theory dependence suffices to spoil the objectivity of a proposal. No credible discourse complies with such restrictions. Far from compromising the existence of knowledge, correct and incorrect, rational and nonrational ideas, however. the said old way of thinking is simply incapable of representing the cognitive achievements that we actually have. This paper discusses a contemporary way of approaching the difference between ideas of high and (...) low descriptive quality in terms of epistemological criteria that prevail in the most rigorous and reliable scientific practices. (shrink)

This paper discusses one area of the interface between science and ethics: the genetic manipulation and design of human beings. Genetic interventions are an increasingly powerful eugenic resource, but they raise ethical suspicions. Critics condemn them, alleging severe negative consequences for society and the manipulated individuals involved. I analyze some influential general arguments proposed against artificially selecting the next generation and conclude that the arguments are insufficient to cast blanket prohibitions against genetic interventions. Eugenic projects are compatible in principle with (...) the pursuit of dignity, freedom, and tolerance at the individual and social levels. The ethical challenges raised by genetic interventions are real and vital. Still, it seems more ethically beneficial to approach them piecemeal through public-level arguments informed by science and specific to the cases encountered. (shrink)

The adventure of philosophy began in Greece, where it was gradually developed by the ancient thinkers as a special kind of knowledge by which to explain the totality of things. In fact, the Greek language has always used the word onta , "beings," to refer to things. At the end of the sixth century BCE, Parmenides wrote a poem to affirm his fundamental thesis upon which all philosophical systems should be based: that there are beings. In By Being, It Is (...) , Nestor-Luis Cordero explores the richness of this Parmenidean thesis, which became the cornerstone of philosophy. Cordero's textual analysis of the poem's fragments reveals that Parmenides' intention was highly didactic. His poem applied, for the first time, an explicative method that deduced consequences from a true axiom: by being, it is . To ignore this reality meant to be a victim of opinions. This volume explains how without this conceptual base, all later ontology would have been impossible. This book offers a clear and concise introduction to the Parmenidean doctrine and helps the reader appreciate the imperative value of Parmenides's claim that "by being, it is." "This thorough and controversial book will certainly be valued highly by the international community of scholars devoted to the study of ancient philosophy as well as by educated readers worldwide." --Alfonso Gomez-Lobo, Georgetown University " By Being, It Is offers a meticulous discussion of one of the most puzzling theses in the history of philosophy. It is a highly challenging piece of work from a philosophical viewpoint, an outstanding model of philological work, and a contribution that causes anyone interested in philosophical matters to reflect." --Marcelo D. Boeri, National Council for Scientific and Technological Research, Argentina "Parmenides' importance consists in the fact that he represents an absolute beginning in history, and particularly in the history of thought. We can understand why, for more than twenty years now, N.L. Cordero has devoted tremendous efforts to understanding the few verses that remain to us of this Poem. The result is the present book, characterized by its completeness and its rigor. It is an essential work on a seminal author." --Luc Brisson, National Council for Scientific Research, France. (shrink)

At a time when ideas of crisis and critique are at the forefront of public discourse, this article seeks to understand moments of crisis vis-à-vis critique as a key feature of critical social theory. It addresses Jürgen Habermas’s strong claim that this relationship accounts for a ‘model of analysis’ concerned with grasping the ‘diremptions’ of social life. To elaborate this reading, the article pays attention to the main problems Habermas identifies in conventional ways of understanding the concepts of ‘crisis’ and (...) ‘critique’ in social theory. The aim is to examine the mode in which he reconsiders each of these terms and then reasserts the dialectical link between them. I reconstruct this relationship by taking as cases two of his most substantive works of social theorizing: The Theory of Communicative Action, and Between Facts and Norms. Based on this interpretation, I suggest that though Habermas contributes to resituating the practice of critique as a communicative translation of objective crisis, he does not adequately account for another key movement: when critique actually initiates, enacts and furthers the moment of crisis. (shrink)

This chapter contains sections titled: Introduction Argentina Mexico Brazil Chile and Puerto Rico Peru Other Centers Concluding Remarks References Further Reading.

In order to confirm that the sophist is a manufacturer of illusions, Plato argues that it is necessary to refute Parmenides’s thesis which states that there is only – as Plato interprets it – the absolute being. Most likely an echo of this thesis is found in Antisthenes, whom Plato seems to allude to in the _Sophist, _for whom “what is, is true”. This conception of truth is known as “ante-predicative” or ontological, and, according to Heidegger, would be original. It (...) is not the case. From Homer to Parmenides, truth was always attributed to a speech or thought, never to a “being”. The “ante-predicative” conception of truth was a creation of philosophy, which probably began with Parmenides and continued with Antisthenes. When Plato refutes it, in the second part of the _Sophist, _only returns to the past, because he makes speech the “place” of truth. (shrink)

Se cree en algunos círculos que el proyecto del realismo científico lleva tiempo muerto, a manos –reza la historia– de las críticas propuestas en el último siglo por Thomas Kuhn, Bas van Fraassen, Larry Laudan y otros importantes pensadores. Entre las jugadas libradas en su contra se destacan algunos argumentos globales sobre la infradeterminación empírica de las teorías, así como argumentos inductivos en contra del modelo de refinamiento acumulativo del avance del conocimiento científico. La fuerza de tales argumentos, tal como (...) se los ha presentado, parece, sin embargo, grandemente exagerada. Y aunque el proyecto del realismo científico dista de estar completo, tampoco hay un caso contundente que permita declararlo en agonía (y mucho menos muerto), o tal es mi argumento en este trabajo. (shrink)

ABSTRACTThis article discusses dialectics as a method of critique which takes concepts it primal object of inquiry. Through a reading of Theodor W. Adorno’s lecture course Introduction to Dialectics, it argues that for dialectical critique concepts are living organs of social reality whose work must observed in terms of constellations of experiences and practices, and through specific historical sites and social processes. The article reconstructs three moments in Adorno’s thinking of critique’s relation to conceptuality: the “pedagogical effect” of concepts on (...) our habits of thought, the socio-historical formation of concepts as “fields of force”, and the need of a “micrological method” of engagement with social reality. Within this framework, the article shows that the movement of dialectical critique is prompted by the cognitive utopia of using concepts to reach material reality, as well as by the ethical demand of making justice to what is not grasped by the existing conceptual order of society. By combining both moments, the goal of dialectical critique is not to identify the correct meaning of concepts, but to work through them as to unlock the normative imagination of society. (shrink)

Logic is a central and highly useful part of philosophy. Its value is particularly evident when it comes to keeping our thinking about disjunctive probabilities clear. Because of the two meanings of “or”, logic can show how the likelihood of a disjunction being true can be determined quite easily. To gauge the chance that one of two or more exclusive alternatives is true, one need only sum up their respective likelihoods. And to know the chance that at least one of (...) two or more compatible alternatives is true, one simply has to figure the chance that it is false that all of them are false! (shrink)

Heritage values are basic in conservation, nevertheless there is not a methodology to analyze their variation over time and how it has affected the conservation of heritage assets. Therefore, a methodology that allows us to determine their variation in written descriptions about a specific heritage site was needed. In this article we have addressed the concept of heritage values and stressed their importance and their variability over time, but also analyzed different methods from the field of linguistics that would better (...) adapt to determine heritage values variation and their application in the heritage field. (shrink)

La Déesse de Parménide annonce toujours que les δόξαι sont un produit humain. Mais il y a un point qui n'a pas été en général remarqué dans les études consacrées à l'étude des δόξαι: elles décrivent une activité humaine qui consiste a expliquer la réalité par la présence de principes opposés, et qui est toujours en rapport avec la "nomination". Il y avait à l'époque de Parménide une école qui correspondait à ce portrait robot, ou s'agit-il d'un collage de Parménide? (...) Quoi qu'il en soit, il est attesté la présence d'une branche du Pythagorisme qui se caractérisait, précisément, pour "placer" des noms sur les choses. (shrink)

The main goal of this paper is to offer a reading of Reinhart Koselleck’s work as an ally of critical theory. My contention is that, despite customary accusations of Koselleck being an anti-Enlightenment historian detrimental to social criticism and emancipatory politics, his investigations on the semantic fabric of modern society may actually expand our resources for the critique of domination. In order to make this argument plausible, I reconstruct some antinomies that are at the basis of Koselleck’s work (state/society, language/reality, (...) experience/expectation) and discuss their critical potential. This analysis shows that, rather than a rejection of the spirit of critique, Koselleck contributes to the temporalization of the practice of critique as such: namely, a clarification of the contradictions and potentials of a reflexive practice imbued in the struggle between the need to comprehend the world as it is and the right to experiment with other forms of life. (shrink)

Philosophers of science disagree on the extent to which epistemology transcends the social sphere in mature branches of science. In this paper I suggest a way of vindicating a key aspect of the transcendence thesis without questioning the social nature of science. Such vindication requires epistemological autonomy to prevail along channels having to do with (1) selection of research goals, (2) use of human subjects and public resources in research, (3) social interventions aimed at helping science fulfill its epistemic goals, (...) and (4) social interventions aimed at helping people and the community protect themselves from harmful scientific activity. This paper focuses on type (3), specifically on social pressure to diversify the points of view represented in scientific research. My exploration proceeds by contrasting two case studies involving pluralist enrichment of scientific research. Both encompass epistemological reform. In one (Feminist Biology) reform is pushed largely from outside the scientific sphere; in the other (Einstein's development of Special Relativity) reform originates largely from within. Examination of these cases shows why general pluralist arguments fail and also why social intervention in epistemological matters is a misguided activity - or so I argue. (shrink)