During postembryonic development, all organs of a plant are ultimately derived from a few pluripotent stem cells found in specialized structures called apical meristems. Here we discuss our current knowledge about the regulation of plant stem cells and their environments with main emphasis on the shoot apical meristem of Arabidopsis thaliana. Recent studies suggest that stem cells are localized in specialized niches where signals from surrounding cells maintain their undifferentiated state. In the shoot meristem, initiation of stem cells during embryogenesis, (...) regulation of stem‐cell homeostasis and termination of stem‐cell maintenance during flower development appear to primarily involve regulation of the stem‐cell niche. BioEssays 25:961–970, 2003. © 2003 Wiley Periodicals, Inc. (shrink)

This paper offers an explanation of the fact that sentences of the form (1) ‘X may A or B’ may be construed as implying (2) ‘X may A and X may B’, especially if they are used to grant permission. It is suggested that the effect arises because disjunctions are conjunctive lists of epistemic possibilities. Consequently, if the modal may is itself epistemic, (1) comes out as equivalent to (2), due to general laws of epistemic logic. On the other hand, (...) on a deontic reading of may, (2) is only implied under exceptional circumstances – which usually obtain when (1) is used performatively. (shrink)

Thomas Wheatland examines the influence of the Frankfurt School, or Horkheimer Circle, and how they influenced American social thought and postwar German sociology.

Our minds have physical effects. This happens, for instance, when we move our bodies when we act. How is this possible? Thomas Kroedel defends an account of mental causation in terms of difference-making: if our minds had been different, the physical world would have been different; therefore, the mind causes events in the physical world. His account not only explains how the mind has physical effects at all, but solves the exclusion problem - the problem of how those effects (...) can have both mental and physical causes. It is also unprecedented in scope, because it is available to dualists about the mind as well as physicalists, drawing on traditional views of causation as well as on the latest developments in the field of causal modelling. It will be of interest to a range of readers in philosophy of mind and philosophy of science. This book is also available as Open Access. (shrink)

Archaeology can provide two bodies of information relevant to the understanding of the evolution of human cognition – the timing of developments, and the evolutionary context of these developments. The challenge is methodological. Archaeology must document attributes that have direct implications for underlying cognitive mechanisms. One example of such a cognitive archaeology is found in spatial cognition. The archaeological record documents an evolutionary sequence that begins with ape-equivalent spatial abilities 2.5 million years ago and ends with the appearance of modern (...) abilities in the still remote past of 400,000 years ago. The timing of these developments reveals two major episodes in the evolution in spatial ability, one, 1.5 million years ago and the other, one million years later. The two episodes of development in spatial cognition had very different evolutionary contexts. The first was associated with the shift to an open country adaptive niche that occurred early in the time range of Homo erectus. The second was associated with no clear adaptive shift, though it does appear to have coincided with the invasion of more hostile environments and the appearance of systematic hunting of large mammals. Neither, however, occurred in a context of modern hunting and gathering. Key Words: Archaeology; evolution; Homo erectus; spatial cognition; symmetry. (shrink)

As one of America’s "public intellectuals," John Dewey was engaged in a lifelong struggle to understand the human mind and the nature of human inquiry. According to Thomas C. Dalton, the successful pursuit of this mission demanded that Dewey become more than just a philosopher; it compelled him to become thoroughly familiar with the theories and methods of physics, psychology, and neurosciences, as well as become engaged in educational and social reform. Tapping archival sources and Dewey’s extensive correspondence, Dalton (...) reveals that Dewey had close personal and intellectual ties to scientists and scholars who helped form the mature expression of his thought. Dewey’s relationships with F. M. Alexander, Henri Matisse, Niels Bohr, Myrtle McGraw, and Lawrence K. Frank, among others, show how Dewey dispersed pragmatism throughout American thought and culture. (shrink)

This paper introduces a class of graphical independence models that is closed under marginalization and conditioning but that contains all DAG independence models. This class of graphs, called maximal ancestral graphs, has two attractive features: there is at most one edge between each pair of vertices; every missing edge corresponds to an independence relation. These features lead to a simple parameterization of the corresponding set of distributions in the Gaussian case.

This textbook introduces undergraduate students of language and linguistics to the basic ideas, insights, and techniques of contemporary semantic theory. The book starts with everyday observations about word meaning and use and then gradually zooms in on the question of how speakers manage to meaningfully communicate with phrases, sentences, and texts they have never come across before. Extensive English examples provide ample illustration.

The continuing philosophical interest in the famous 'Protocol Sentence Debate' in the Vienna Circle of Logical Positivists is, to a large measure, due to the focus on the epistemological issues in the dispute, and the neglect of differences among the leading players in their philosophical views of logic and language. In Protocols, Truth and Convention, the current understanding of the debate is advanced by developing the contemporaneous views of logic and language held by the principal disputants. Rudolf Carnap and Moritz (...) Schlick. It is argued - largely on the basis of unpublished manuscripts and correspondence - that, despite apparent differences in their respective conceptions of language, there are nonetheless striking similarities, particularly with respect to the conventionality of language. Nonetheless, one key issue - concerning the syntacticism inherent in Carnap's early Thirties' philosophy - separates the two viewpoints in the clash over protocols. Finally, it is argued that Carnap's syntacticism is untenable, a conclusion that Carnap himself finally reached in the closing exchanges of the protocol sentence controversy. (shrink)

For some thirteen years now, the World Bank (‘the Bank’) has regularly reported the number of people living below an international poverty line, colloquially known as ‘$1/day’.3 Reports for the most recent year, 1998, put this number at 1,175.14 million.4 The Bank’s estimates of severe income poverty — its global extent, geographical distribution, and trend over time — are widely cited in official publications by governments and international organizations and in popular media, often in support of the view that liberalization (...) and globalization have helped to reduce poverty worldwide. For instance, the President of the World Bank recently declared: “Over the past few years, these better policies have contributed to more rapid growth in developing countries’ per capita incomes than at any point since the mid-1970s. And faster growth has meant poverty reduction: the proportion of people worldwide living in absolute poverty has dropped steadily in recent decades, from 29% in 1990 to a record low of 23% in 1998. After increasing steadily over the past two centuries, since 1980 the total number of people living in poverty worldwide has fallen by an estimated 200 million — even as the world’s population grew by 1.6 billion.”. (shrink)

Thomas Kretschmar and Andreas Hamburger provide an important overview of psychodynamic work in companies, presenting different viewpoints and explaining key psychoanalytic terms and techniques for coaching and supervision. Written in the form of a dialog between Kretschmar, an entrepreneur, and Hamburger, a psychoanalyst, the book provides unique insight into psychodynamic coaching and supervision. Psychodynamic Coaching and Supervision for Executives begins with an overview of coaching, psychodynamic approaches, the unconscious and relevant psychoanalytic theory. Kretschmar and Hamburger then consider Operationalized Psychodynamic (...) Diagnosis (OPD) in business, assess current research into coaching and supervision and present a selection of key case studies. At the end of each chapter, the authors compare their positions, giving important contextual information, exploring objections, complications and improvements, and providing a precise summary of the topic. This book will be an illuminating guide for therapists and professionals who wish to learn how psychoanalytic theory and practice can be used for coaching, counseling, and supervision in an organizational context. (shrink)

Dans la vie d'un lecteur, certains auteurs occupent une place à part : lectures inaugurales, compagnons de tous les jours, sources auxquelles on revient. La collection "Les auteurs de ma vie" invite de grands écrivains contemporains à partager leur admiration pour un classique, dont la lecture a particulièrement compté pour eux. Dans sa jeunesse, Thomas Mann a lu et médité Schopenhauer, philosophe de la volonté et du pessimisme, qui a largement influencé l'oeuvre de celui qui deviendra l'un des plus (...) grands écrivains modernes de la décadence. Cet hommage à son maître nous offre une clé précieuse de son parcours intellectuel. (shrink)

Thomas Wylton's Quaestio de anima intellectiva presents a controversial defence of Averroes' interpretation of Aristotelian psychology. The detailed introduction guides the reader through the transmission of the text, as well as the philosophical contents of one of the most significant medieval treatments of the nature of the soul.

Approaches to programming ethical behavior for computer systems face challenges that are both technical and philosophical in nature. In response, an incrementalist account of machine ethics is developed: a successive adaptation of programmed constraints to new, morally relevant abilities in computers. This approach allows progress under conditions of limited knowledge in both ethics and computer systems engineering and suggests reasons that we can circumvent broader philosophical questions about computer intelligence and autonomy.

David Thomas takes a close look at the United Kingdom during the 1970s to examine the emergence of “electroculture.” Mapping class struggle, dispossession, and state violence onto a history of oil, Thomas makes the case that labor politics and energy politics are deeply intertwined.

This volume contains selected essays in moral and political philosophy by Thomas Hurka. The essays address a wide variety of topics, from the well-rounded life and the value of playing games to proportionality in war and the ethics of nationalism. They also share a common aim: to illuminate the surprising richness and subtlety of our everyday moral thought by revealing its underlying structure, which they often do by representing that structure on graphs. More specifically, the essays all give what (...) the first in the volume calls "structural" as against "foundational" analyses of moral views. Eschewing the grander ambition of grounding our ideas about, say, virtue or desert in claims that use different concepts and concern some other, allegedly more fundamental topic, they examine these ideas in their own right and with close attention to their details. As well as illuminating their individual topics, the essays illustrate the insights this structural method can yield. (shrink)

A physician and medical reformer enthused by the scientific and cultural progress of the Enlightenment as it took hold in Britain, Thomas Percival wrote on many topics, including public health and demography. His volume on medical ethics is considered the first modern formulation, and it and several of his other works are reissued in this series. This short book of improving tales, first published in 1777, and revised and enlarged in 1779, was originally written for his own children, and, (...) as he says, the articles 'are placed in the order in which they were written … as leisure allowed, or as the subjects of them were suggested'. The little stories contain lessons on obedience to parents, family affection, and kindness to animals, among many other examples of moral instruction. Percival refers to the book as 'Part the First', but a further collection seems never to have been published. (shrink)

Pangle believes liberal democracy is in grave danger of losing its way in the tricky Cold War "endgame." This philosophical discourse rethinks the foundations of democratic society through a dialogue with Locke, Kant, Jefferson, Montesquieu, Hume, Plato, and other seminal figures. Diagnosing the "disintegration all around us" from the classical republican perspective of Aristotle and Socrates, Pangle presents prescriptions involving workplace democracy and greater citizen participation in government; he espouses policies encouraging the aged to remain employed; urges tough-minded incentives for (...) hard work as part of welfare programs; and advocates civic education as the heart of American public schooling. The last chapter defines the goals of higher education in terms of a Socratic dialogue with great books. ISBN 0-8018-4262-X: $25.95. (shrink)

The essay on thirteenth-century ethics will trace the history of three major themes in moral philosophy and theology, namely the morality of individual acts, virtue, and happiness. Both Peter Lombard’s rejection of Abelard’s focus on intention and the Fourth Lateran Council’s remarks on confession caused thinkers such as William of Auvergne and Philip the Chancellor to develop a way of classifying acts and determining responsibility for such acts. Thomas Aquinas and clarified and changed the technical vocabulary but adopted much (...) from their views on knowledge and moral responsibility. A similar development took place in the understanding of virtue. Philip and others discussed the nature and unity of the virtues in the context of a patristic inheritance that was largely influence by Stoicism. Thomas Aquinas was among the first to discuss the connection between specifically distinct virtues, bringing to bear Aristotle’s description of prudence in Book VI of the Nicomachean Ethics. Moreover, whereas previous thinkers had primarily distinguished between political and theological virtues, Thomas distinguished more carefully between both infused and acquired moral virtues, and theological virtues that are only infused. He explained that the intellectual virtues, although better in themselves, are inferior to the moral virtues when it comes to making a good human being. Debates over the role of happiness in ethics were related to such distinctions. Early generations had focused primarily on the role that moral and theological virtue plays in its role as leading to happiness in heaven. In contrast, some Aristotelians seem to emphasize the priority of intellectual virtue over moral virtue, and consequently the life of the philosopher over the life of the citizen. Thomas Aquinas distinguished between the different perfections of intellectual and moral virtue, and distinguished carefully between the imperfect happiness of this life and the perfect happiness of the next. Although Thomas brought these issues together in an admirable synthesis, few of his contemporaries thought that he had successfully addressed these issues. (shrink)