In this paper we propose a theoretical model of protein folding and protein evolution in which a polypeptide (sequence/structure) is assumed to behave as a Maxwell Demon or Information Gathering and Using System (IGUS) that performs measurements aiming at the construction of the native structure. Our model proposes that a physical meaning to Shannon information (H) and Chaitin's algorithmic information (K) parameters can be both defined and referred from the IGUS standpoint. Our hypothesis accounts for the interdependence of protein folding (...) and protein evolution through mutual influencing relationships mediated by the IGUS. In brief, IGUS activity in protein folding determines long term tendencies that emerge at the evolutionary time-scale.Thus, protein evolution is a consequence of measurements executed by proteins at the cellular level, where the IGUS imposes a tendency to attain a highly unique stable native form that promotes the updating of the information content. The folding kinetics observed is, thus, the outcome of an evolutionary process where the polypeptide-IGUS drives the evolution of its linear sequence. Finally, we describe protein evolution as an entropic process that tends to increase the content of mutual algorithmic information between the sequence and the structure. This model enables one: 1. To comprehend that full determination of the three-dimensional structure by the linear sequence is a tendency where satisfaction is only possible at thermodynamic equilibrium .2. To account for the observed randomness of the amino acid sequences. 3. To predict an alternation of periods of selection and neutral diffusion during protein evolutionary time. (shrink)
This paper defends an internalist perspective of selection based on the hypothesis that considers living evolutionary units as Maxwell's demons (MD) or Zurek's Information Gathering and Using Systems (IGUS). Individuals are considered as IGUS that extract work by means of measuring and recording processes. Interactions or measurements convert uncertainty about the environment (Shannon's information, H) into internalized information in the form of a compressed record (Chaitin's algorithmic complexity, K). The requirements of the model and the limitations inherent to its formalization (...) are discussed. This approach offers an alternative view to the causes of evolutionary variations which goes beyond the classical Lamarckian-Darwinian controversy. I argue that random variations only apply near-to-equilibrium at the time organisms have attained structural closure, and that a speed up of mutation rates that facilitates the production of directed variations occurs far-from-equilibrium due to organisms' openness to the surrounding conditions. However, real organisms are located somewhere between the above two cases and thus, operate at an intermediate stage where there is a maximum efficiency of H/K conversion. In consequence, IGUS keep their autonomy and evolving capacity by compromising between external circumstances and inner constraints. This compromise is made possible by closure regulation. Likewise, this model explains why nature has favored the selection of agents capable of selectively recording a partial description of their environment. (shrink)
This article studies the mathematical properties of two systems that model Aristotle's original syllogistic and the relationship obtaining between them. These systems are Corcoran's natural deduction syllogistic and Lukasiewicz's axiomatization of the syllogistic. We show that by translating the former into a first-order theory, which we call T RD, we can establish a precise relationship between the two systems. We prove within the framework of first-order logic a number of logical properties about T RD that bear upon the same properties (...) of the natural deduction counterpart ? that is, Corcoran's system. Moreover, the first-order logic framework that we work with allows us to understand how complicated the semantics of the syllogistic is in providing us with examples of bizarre, unexpected interpretations of the syllogistic rules. Finally, we provide a first attempt at finding the structure of that semantics, reducing the search to the characterization of the class of models of T RD. (shrink)
The combined use of computers and telecommunications and the latest evolution in the field of Artificial Intelligence brought along new ways of contracting and of expressing will and declarations. The question is, how far we can go in considering computer intelligence and autonomy, how can we legally deal with a new form of electronic behaviour capable of autonomous action? In the field of contracting, through Intelligent Electronic Agents, there is an imperious need of analysing the question of expression of consent, (...) and two main possibilities have been proposed: considering electronic devices as mere machines or tools, or considering electronic devices as legal persons. Another possibility that has been frequently mentioned consists in the application of the rules of agency to electronic transactions. Meanwhile, the question remains: would it possible, under a Civil Law framework, to apply the notions of “legal personhood” and “representation” to electronic agents? It is obvious that existing legal norms are not fit for such an endeavouring challenge. Yet, the virtual world exists and it requires a new but realistic legal approach on software agents, in order to enhance the use of electronic commerce in a global world. (shrink)
This study provides empirical evidence on how corporate sustainability performance (CSP), as proxied by membership of the Dow Jones sustainability index, is reflected in the market value of equity. Using a theoretical framework combining institutional perspectives, stakeholder theory, and resource-based perspectives, we develop a set of hypotheses that relate the market value of equity to CSP. For a sample of North American firms, our preliminary results show that CSP has significant explanatory power for stock prices over the traditional summary accounting (...) measures such as earnings and book value of equity. However, further analyses suggest that we should not focus on corporate sustainability itself. Our findings suggest that what investors really do is to penalize large profitable firms with low level of CSP. Firms with incentives to develop a high level of CSP not engaging on such strategy are, thus, penalized by the market. (shrink)
Resenha do livro de: ALVES NETO, Rodrigo Ribeiro. Alienações do mundo: uma interpretaçáo da obra de Hannah Arendt . Rio de Janeiro/Sáo Paulo: Editora PUC-Rio/Edições Loyola, 2009, 216 p.
Considerando que o cogito possa ser tomado, nas Meditações, como uma conclusão de uma demonstração, pode-se avançar a tese de que essa demonstração está consoante ao método analítico, que Descartes reconhece empreender nesse texto. Esse método teria entre as suas funções nas Meditações aquela de apresentar – sob a forma de uma rede de implicações ontológicas – o raciocínio que conduz à certeza da existência. Como cumpre no referido texto determinar a certeza da existência sem tomar como base nenhuma certeza (...) preestabelecida, o método analítico financiaria, segundo a nossa interpretação, uma reconstrução do argumento do cogito sob uma base indireta, mais precisamente através de uma reductio ad absurdum, cujo objetivo consiste em mostrar a contradição inelutável que surge na tentativa de um indivíduo de provar a sua não existência. (shrink)
O presente texto visa abordar a pertinência crítica da filosofia kantiana da história tentando assinalar o lugar transcendental da noçáo de fio condutor da natureza, para nós urn princípio regulativo passível de ser usado pelo discurso filosófico da história, que por isso náo se toma urn conhecimento teórico, mas nem por isso deixa de ser uma espécie de conhecimento, de cunho prático.
Resumo: Este artigo busca compreender a situaçáo filosófica de alguns dos autores cujas vidas e cujos pensamentos estiveram entre Kant e Hegel. Romantismo alemáo foi como ficou conhecida esta época. Dentre seus primeiros autores, estiveram Friedrich Schlegel e Novalis, além de Hölderlin. Tais pensadores buscaram superar a crítica feita por Kant à pretensáo do conhecimento filosófico de alcançar a verdade absoluta, as coisas como sáo em si mesmas. Essa superaçáo, contudo, jamais conseguiu, para eles, completar-se – como aconteceria depois no (...) sistema de Hegel, para quem contradições só seriam aceitas como etapas do que chamou de dialética, cuja essência era, ao fim, solucioná-las na figura da síntese. Limitaçáo finita do homem diante do todo do ser, como firmara Kant, era o que ficava para trás com Hegel. Schlegel, Novalis e Hölderlin náo se contentam com a crítica de Kant, mas tampouco acreditam na síntese de Hegel. Parecem sugerir outro caminho para a modernidade ocidental, que náo se jogava na sanha hegeliana pelo saber absoluto sem despertá-la, toda vez, pela consciência crítica kantiana – e que náo se contentava com esta sem sonhar com aquela. Tal caminho é o que este artigo busca compreender. Palavras-chave: Hegel; Kant; Romantismo. (shrink)
Eugenio Lecaldano offers an important contribution to the tradition of Italian liberal thought. In his book on bioethics, he deals with the subject’s most relevant topics by adopting a utilitarian perspective, which clearly demonstrates the influence of J.S. Mill’s philosophy. The indication of some significant analogies and the distinction between different moral problems are some of the most interesting and useful aspects of Lecaldano’s work.
Resenha do livro de Andrade, Abraháo Costa. O pote e a rodilha : tempo e imaginaçáo como história por fazer segundo o pensamento de Paul Ricoeur. Natal: EDUFRN, 2006. [Coleçáo Metafísica]. 134 páginas.
The ?values of sport? is a concept that is often used to justify actions and policies by a range of agents and agencies from coaches and teachers to governing bodies and educational institutions. From a philosophical point of view, these values deserve to be analysed with great care to make sure we understand their nature and reach. The aim of this paper is to critically examine the values carried by the educational conception of sport that Pierre de Coubertin developed and (...) to see how they relate to certain values in the philosophy of Friedrich Nietzsche. To be able to understand in depth the moral construct of de Coubertin's system, it is essential to delve into the entire system he builds in order to develop athletic participants closer to his ideal of what a human should be. This in turn rests on his conception of Man, which is comprised of body, spirit and character. An understanding of his structure opens the way to a broader awareness of de Coubertin's educational system, of which sport was only part. We will then see that the values are a consequence of this pedagogical search for the ideal human. It is argued that this ideal of a human is similar to the one described by Nietzsche as the Übermensch . A philosophical case study is conducted, taking as its object the story of the first recipient of the Pierre de Coubertin medal, which rewards fair play among Olympic competitors. Judging the story through Nietzschean eyes allows for his thoughts to be put into practice. His lesser-known texts such as Homer and Competition on the emulation of creative powers shed light on today's sports. Concepts such as guilt, excellence, will to power and effectiveness help us compare these two authors and understand that competition is not necessarily about dominating others, but more about generating human excellence. (shrink)
Abstract This paper describes the early history of magnetochemistry: the search for chemical effects of magnetism in the nineteenth century. Some early researchers, such as Johann Wilhelm Ritter, attempted to reproduce with magnets the effects that had been produced by electricity and Volta’s battery. For several decades, researchers successively reported positive results and denied claims concerning the effect of magnetism in oxidation, electrolysis, reduction of metals from saline solutions, crystallisation, change of colour of vegetable tinctures and other chemical reactions. In (...) the two last decades of the nineteenth century some effects were accepted as real, and a thermodynamic theory of the influence of magnetic fields upon chemical reactions was developed. Finally, Dragomir Hurmuzescu was able to create reproducible experiments and measured the electromotive force between two electrodes, with or without the presence of magnetic fields, confirming the existence of the phenomenon and obtaining results compatible with the theoretical predictions. Afterwards, this magnetochemical effect was accepted as real, but the effect was weak and its practical importance was negligible. The subject was gradually forgotten. Content Type Journal Article Pages 1-26 DOI 10.1007/s10698-011-9127-8 Authors Roberto de Andrade Martins, Department of Physics, State University of Paraiba, Campina Grande, PB, Brazil Journal Foundations of Chemistry Online ISSN 1572-8463 Print ISSN 1386-4238. (shrink)
La síntesis de la filosofía africana aporta datos sorprendentes sobre el origen de la cultura occidental. Ni los filósofos y literatos griegos surgieron de la nada, ni la civilización egipcia nació en sí misma, como un milagro. El hilo conductor, la fuente nutricia de ambos “milagros” culturales “egipcio y griego” está en la cultura africana. Y no podía ser de otra manera ya que nuestra especie, el homo sapiens, surgió en África hace tan sólo 200 milenios. Allí se dieron los (...) primeros logros esenciales de la condición humana: el lenguaje oral y escrito y la emergencia del pensamiento sistematizado, de la dimensión ética y artística del género humano. Con gran profundidad Eugenio Nkogo demuestra que la civilización humanista vino desde África a Occidente a través de Egipto y Roma. Después de sufrir el esclavismo y el colonialismo, el pensamiento africano se está convirtiendo en la vanguardia de un nuevo movimiento que sigue ayudando al género humano en su ruta hacia un mundo más civilizado y libre. (shrink)
We investigate the philosophical significance of the existence of different semantic systems with respect to which a given deductive system is sound and complete. Our case study will be Corcoran’s deductive system D for Aristotelian syllogistic and some of the different semantic systems for syllogistic that have been proposed in the literature. We shall prove that they are not equivalent, in spite of D being sound and complete with respect to each of them. Beyond the specific case of syllogistic, the (...) goal is to offer a general discussion of the relations between informal notions—in this case, an informal notion of deductive validity—and logical apparatuses such as deductive systems and (model-theoretic or other) semantic systems that aim at offering technical, formal accounts of informal notions. Specifically, we will be interested in Kreisel’s famous ‘squeezing argument’; we shall ask ourselves what a plurality of semantic systems (understood as classes of mathematical structures) may entail for the cogency of specific applications of the squeezing argument. More generally, the analysis brings to the fore the need for criteria of adequacy for semantic systems based on mathematical structures. Without such criteria, the idea that the gap between informal and technical accounts of validity can be bridged is put under pressure. (shrink)
Norms conferring public or private powers, i.e., the competence to issue other norms, play a very important rôle in law. But there is no agreement among legal philosophers about the nature of such norms. There are two main groups of theories, those that regard them as a kind of norms of conduct (either commands or permissions) and those that regard them as non-reducible to other types of norms. I try to show that reductionist theories are not quite acceptable; neither the (...) command-variety (Kelsen, Alf Ross inOn Law and Justice), nor the permission-variety (von Wright, Kanger, Lindahl) provide a satisfactory account of competence norms.Among the authors who maintain that competence norms are different from (and hence not reducible to) norms of conduct are Hart, Ross inDirectives and Norms, and Searle. Ross and Searle distinguish between regulative and constitutive rules as two radically different kinds of rules and classify competence norms among constitutive rules. This distinction runs parallel to von Wright's distinction between rules that are prescriptions and determinative rules. While the first regulate actions (by commanding, prohibiting, or permitting them), determinative rules define certain concepts. To view competence norms as (partial) definitions of certain legal concepts (like those of legislator, judge, etc.) seems to open interesting perspectives and to shed light on at least one aspect of these elusive norms. (shrink)
Current Trends in Linguistics, vol. XII: Linguistics and Adjacent Arts and Sciences, The Hague - Paris 1974, pp. 103-171, entitled: "Linguistics and ...
We investigate the relations among Brandom’s three dimensions of semantic inferential articulation, namely, incompatibility entailments, committive consequences, and permissive consequences. In his unpublished manuscript “Conceptual Content and Discursive Practice” Brandom argues that (1) incompatibility entailment implies committive consequence, and that (2) committive consequence in turn implies permissive consequence. We criticize this hierarchy both on internal and external grounds. Firstly, we prove that, using Brandom’s own definitions, the reverse of (1) also holds, and that the reverse of (2) may hold (but (...) the proof relies on substantive assumptions). This suggests that there are no three different notions of inference emerging from Brandom’s definitions, but at most two, and perhaps even just one. Secondly, this result puts into question the connections between the three inferential relations and the familiar notions of deduction and induction. (shrink)
In this work I argue that Descartes was not a trialist by showing that the main tenets of trialist interpretations of Descartes's theory of substance are either not supported by the text or are not sufficient for establishing the trialist interpretation.
To Aristotle, spoken words are symbols, not of objects in the world, but of our mental experiences related to these objects. Presently there are two major strands of interpretation of Aristotle’s concept of the linguistic sign. First, there is the structuralist account offered by Coseriu (Geschichte der Sprachphilosophie. Von den Anfängen bis Rousseau, 2003 [1969], pp. 65–108) whose interpretation is reminiscent of the Saussurean sign concept. A second interpretation, offered by Lieb (in: Geckeler (Ed.) Logos Semantikos: Studia Linguistica in Honorem (...)Eugenio Coseriu 1921–1981, 1981) and Weidemann (in: Schmitter (Ed.) Geschichte der Sprachtheorie 2. Sprachtheorien der abendländischen Antike, 1991), says that Aristotle’s concept of the linguistic sign is similar to the one presented in Ogden and Richard’s (The meaning of meaning: A study of the influence of language upon thought and of the science of symbolism, 1970 [1923]) semiotic triangle. This paper starts off with an introductory outline of the so-called phýsei-thései discussion which started during presocratic times and culminated in Plato’s Cratylus. Aristotle’s concept of the linguistic sign is to be regarded as a solution to the stalemate position reached in the Cratylus. Next, a discussion is offered of both Coseriu’s and Lieb’s analysis. We submit that Aristotle’s concept of the linguistic sign shows features of both Saussure’s and Ogden and Richards’s sign concept but that it does not exclusively predict one of the two. We argue that Aristotle’s concept of the linguistic sign is based on three different relations which together evince his teleological as well empiricist point of view: one internal (symbolic) relation and two external relations, i.e. a likeness relation and a relation katà synthéken. (shrink)
The epistemological status of semantic components of ethnosemantics is investigated with reference to Wittgenstein's definition of the meaning of a word as its use in language. Semantic components, like the intension of words in logistic philosophy, constitute the conditions which must pertain to objects in order that they are denoted by particular words. "Componential meaning" is determined to be another form of "unitary meaning" and hence subject to the same critical arguments made by Wittgenstein against the latter's three fundamental types: (...) (1) meanings are objects, (2) meanings are images, and (3) meanings are feelings and mental experiences. A rebuttal to D'Andrade's labeling rule objection to the usage theory of meaning is presented. (shrink)
Bribery has previously been viewed as a two-party transaction between the bribe-offerer and the bribe-taker. But there is a third party: the one who has a prior claim on the bribe-taker's loyalty. Breaking the first contract in response to the offer of a bribe is alienation of agency (a category that strictly includes bribes): alienation of agency is the additional immorality of bribery beyond any immorality of the act solicited by the bribe.
We review and discuss A. H. Louie’s book “More than Life Itself: A Reflexion on Formal Systems and Biology” from an interdisciplinary viewpoint, involving both biology and mathematics, taking into account new developments and related theories.
The aim of this paper is to bring to light all the available information upon the circumstances and import of the course on "Matter and spirit. The system of atomist logic" that Bertrand Russell gave in Barcelona in the spring of 1920, which has received no attention to date. The paper relies upon the letters kept at the Russell Archives and the papers left by the two Catalan philosophers who were the organizers of Russell's visit, Joan Crexells (1896-1926) and (...) class='Hi'>Eugenio d'Ors (1881-1954). Also a tentative assessment of Russell's influence on Spanish philosophy is put forward. -/- . (shrink)
The ageing society poses significant challenges to Europe’s economy and society. In coming to grips with these issues, we must be aware of their ethical dimensions. Values are the heart of the European Union, as Article 1a of the Lisbon Treaty makes clear: “The Union is founded on the values of respect for human dignity…”. The notion of Europe as a community of values has various important implications, including the development of inclusion policies. A special case of exclusion concerns the (...) gap between those people with effective access to digital and information technology and those without access to it, the “digital divide”, which in Europe is chiefly age-related. Policies to overcome the digital divide and, more generally speaking, e-inclusion policies addressing the ageing population raise some ethical problems. Among younger senior citizens, say those between 65 and 80 years old, the main issues are likely to be universal access to ICT and e-participation. Among the older senior citizens, say those more than 80 years old, the main issues are mental and physical deterioration and assistive technology. An approach geared towards the protection of human rights could match the different needs of senior citizens and provide concrete guidance to evaluate information technologies for them. (shrink)
This paper argues that the distinctiveness of the Hering primary hues – red, green, blue, and yellow – is already evident at the retina. Basic features of spectral sensitivity provide a foundation for the development of unique hue perceptions and the hue categories of which they are focal examples. Of particular importance are locations in color space at which points of minimal and maximal spectral sensitivity and extreme ratios of chromatic to achromatic response occur. This account builds on Jameson & (...) D’Andrade’s (1997) insight about the relationship between the Hering primaries and chromatic/achromatic ratios, Romney & Chiao’s (2009) color appearance model, and Thornton’s (1971; 1999) research on artificial lighting. (shrink)
This paper includes a concise survey of the work done in compliance with de Finetti's reconstruction of the Bayes-Laplace paradigm. Section 1 explains that paradigm and Section 2 deals with de Finetti's criticism. Section 3 quotes some recent results connected with de Finetti's program and Section 4 provides an illustrative example.
The ageing society poses significant challenges to Europe’s economy and society. In coming to grips with these issues, we must be aware of their ethical dimensions. Values are the heart of the European Union, as Article 1a of the Lisbon Treaty makes clear: “The Union is founded on the values of respect for human dignity…”. The notion of Europe as a community of values has various important implications, including the development of inclusion policies. A special case of exclusion concerns the (...) gap between those people with effective access to digital and information technology and those without access to it, the “digital divide”, which in Europe is chiefly age-related. Policies to overcome the digital divide and, more generally speaking, e-inclusion policies addressing the ageing population raise some ethical problems. Among younger senior citizens, say those between 65 and 80 years old, the main issues are likely to be universal access to ICT and e-participation. Among the older senior citizens, say those more than 80 years old, the main issues are mental and physical deterioration and assistive technology. An approach geared towards the protection of human rights could match the different needs of senior citizens and provide concrete guidance to evaluate information technologies for them. (shrink)
This paper argues that the distinctiveness of the Hering primary hues—red, green, blue, and yellow—is already evident at the retina. Basic features of spectral sensitivity provide a foundation for the development of unique hue perceptions and the hue categories of which they are focal examples. Of particular importance are locations in color space at which points of minimal and maximal spectral sensitivity and extreme ratios of chromatic to achromatic response occur. This account builds on Jameson and D’Andrade’s ( 1997 (...) ) insight about the relationship between the Hering primaries and chromatic/achromatic ratios, Romney and Chiao’s ( 2009 ) color appearance model, and Thornton’s ( 1971 , 1999 ) research on artificial lighting. (shrink)
The Machiavellian model is often praised as a realistic description of modern corporate life. My analysis of Tne Prince follows Rousseau in arguing that the prince can survive and prosper most easily by creating an environment in which almost all the citizens prosper. Far from licensing unrestrained self-aggrandizement, in this model success only comes from providing real value to almost every citizen for the entire period of one's leadership.Translation from the early sixteenth to the late twentieth century is far from (...) simple; for example, the CEO is in many ways far less powerful than a Medici prince. The closest approximation is a far less bureaucratic organization with very small units possessing maximum autonomy. Also, deciding who is, and who is not, a citizen is not nearly as straightforward as it was for Machiavelli; it probably includes every stakeholder on whom the corporation has a major impact. (shrink)
