Arsenic and phosphorus are group 15 elements with similar chemical properties. Is it possible that arsenate could replace phosphate in some of the chemicals that are required for life? Phosphate esters are ubiquitous in biomolecules and are essential for life, from the sugar phosphates of intermediary metabolism to ATP to phospholipids to the phosphate backbone of DNA and RNA. Some enzymes that form phosphate esters catalyze the formation of arsenate esters. Arsenate esters hydrolyze very rapidly in aqueous solution, which makes (...) it improbable that phosphorous could be completely replaced with arsenic to support life. Studies of bacterial growth at high arsenic:phosphorus ratios demonstrate that relatively high arsenic concentrations can be tolerated, and that arsenic can become involved in vital functions in the cell, though likely much less efficiently than phosphorus. Recently Wolfe‐Simon et al. 1 reported the isolation of a microorganism that they maintain uses arsenic in place of phosphorus for growth. Here, we examine and evaluate their data and conclusions. (shrink)

Social evolution theory conventionally takes an externalist explanatory stance, treating observed cooperation as explanandum and the positive assortment of cooperative behaviour as explanans. We ask how the circumstances bringing about this positive assortment arose in the first place. Rather than merely push the explanatory problem back a step, we move from an externalist to an interactionist explanatory stance, in the spirit of Lewontin and the Niche Construction theorists. We develop a theory of ‘social niche construction’ in which we consider biological (...) entities to be both the subject and object of their own social evolution. Some important cases of the evolution of cooperation have the side-effect of causing changes in the hierarchical level at which the evolutionary process acts. This is because the traits that act to align the fitness interests of particles in a collective can also act to diminish the extent to which those particles are bearers of heritable fitness variance, while augmenting the extent to which collectives of such particles are bearers of heritable fitness variance. In this way, we can explain upward transitions in the hierarchical level at which the Darwinian machine operates in terms of particle-level selection, even though the outcome of the process is a collective-level selection regime. Our theory avoids the logical and metaphysical paradoxes faced by other attempts to explain evolutionary transitions. (shrink)

We discuss five kinds of representations of rationales and provide a formal account of how they can alter disputation. The formal model of disputation is derived from recent work in argument. The five kinds of rationales are compilation rationales, which can be represented without assuming domain-knowledge (such as utilities) beyond that normally required for argument. The principal thesis is that such rationales can be analyzed in a framework of argument not too different from what AI already has. The result is (...) a formal understanding of rationales, a partial taxonomy, and a foundation for computer programs that represent and reason with rationales.The five kinds of rationales are as follows: (c)ompression and (s)pecialization, which yield rules, and (d)isputation, which yields a decision. These are modeled as potentially changing the focus of the dispute. Then there are (f)it, a rationale for rules, and (r)esolution, a rationale for decisions. These cannot be modeled as simply; they force disputation to a meta-level, at least temporarily. (shrink)

To whom do sperm and ova belong? Few tissues are produced by the human body with more waste than the germ cells. Yet dominion over the germ cells, and over the early embryo that results from their union in vitro, is behind much of the emotion that modern reproductive intervention can engender. The germ cells differ from other human tissues that can be donated or transplanted because they carry readily utilizable genetic information. Eventual expression of the germ cells' genetic potential (...) is the legitimate concern and responsibility of their donors, although in the right circumstances the responsibility can by agreement be entrusted to institutions administering gamete or embryo donor programmes; these institutions, in turn, may need to assume responsibility for decisions if, in the case of embryo storage, the wishes of the two donors conflict. The fact of sperm and ovum ownership (and the genetic potential that goes with it) before individuals part with these tissues is beyond dispute. Some contentious issues may be clarified if this area of human dominion, namely control over genetic expression among offspring, is acknowledged to be the legitimate persisting concern of those who have produced sperm and ova after storage commences. (shrink)

Error is protean, ubiquitous and crucial in scientific process. In this paper it is argued that understanding scientific process requires what is currently absent: an adaptable, context-sensitive functional role for error in science that naturally harnesses error identification and avoidance to positive, success-driven, science. This paper develops a new account of scientific process of this sort, error and success driving Self-Directed Anticipative Learning (SDAL) cycling, using a recent re-analysis of ape-language research as test example. The example shows the limitations of (...) other accounts of error, in particular Mayo’s (Error and the growth of experimental knowledge, 1996) error-statistical approach, and SDAL cycling shows how they can be fruitfully contextualised. (shrink)

We introduce a linear analogue of Läuchli's semantics for intuitionistic logic. In fact, our result is a strengthening of Läuchli's work to the level of proofs, rather than provability. This is obtained by considering continuous actions of the additive group of integers on a category of topological vector spaces. The semantics, based on functorial polymorphism, consists of dinatural transformations which are equivariant with respect to all such actions. Such dinatural transformations are called uniform. To any sequent in Multiplicative Linear Logic (...) , we associate a vector space of“diadditive” uniform transformations. We then show that this space is generated by denotations of cut-free proofs of the sequent in the theory MLL + MIX. Thus we obtain a full completeness theorem in the sense of Abramsky and Jagadeesan, although our result differs from theirs in the use of dinatural transformations.As corollaries, we show that these dinatural transformations compose, and obtain a conservativity result: diadditive dinatural transformations which are uniform with respect to actions of the additive group of integers are also uniform with respect to the actions of arbitrary cocommutative Hopf algebras. Finally, we discuss several possible extensions of this work to noncommutative logic.It is well known that the intuitionistic version of Läuchli's semantics is a special case of the theory of logical relations, due to Plotkin and Statman. Thus, our work can also be viewed as a first step towards developing a theory of logical relations for linear logic and concurrency. (shrink)

Many physicists regard the flow of time as an illusion. There is an upper level flow of time, the phenomenon of past/present/future; and there is a lower level flow of time which is really a flow of events. Perceptual completion accounts for the lower level flow of time in a few ways: apparent movement; amodal completion; and dynamic change as exemplified by a newly described modal completion that we called happening. It acts like an illusory percept connecting discrete stimuli in (...) all sensory modalities. The past/present/future distinction cannot exist unless an object is perceived to be the same now as it is then. This cognition requires object persistence. Experiments with object persistence suggest the circumstances when that, too, is an illusory percept. The illusory percepts of object persistence and perceptual completion can account for the entire flow of time. Our findings and conclusions are congruent with a few time theories and cosmologies that suggest that the flow of time is an illusion. (shrink)

Health care professionals often face moral dilemmas. Not dealing constructively with moral dilemmas can cause moral distress and can negatively affect the quality of care. Little research has been documented with methodologies meant to support professionals in care for the homeless in dealing with their dilemmas. Moral case deliberation is a method for systematic reflection on moral dilemmas and is increasingly being used as ethics support for professionals in various health-care domains. This study deals with the question: What is the (...) contribution of MCD in helping professionals in an institution for care for the homeless to deal with their moral dilemmas? A mixed-methods responsive evaluation design was used to answer the research question. Five teams of professionals from a Dutch care institution for the homeless participated in MCD three times. Professionals in care for the homeless value MCD positively. They report that MCD helped them to identify the moral dilemma/question, and that they learned from other people’s perspectives while reflecting and deliberating on the values at stake in the dilemma or moral question. They became aware of the moral dimension of moral dilemmas, of related norms and values, of other perspectives, and learned to formulate a moral standpoint. Some experienced the influence of MCD in the way they dealt with moral dilemmas in daily practice. Half of the professionals expect MCD will influence the way they deal with moral dilemmas in the future. Most of them were in favour of further implementation of MCD in their organization. (shrink)

I. Einleitung: Prinzipien einer konstruktivistischen Rekonstruktion des Aufbaus von Wissenschaften. Die Stelle der Protophysik der Zeit in einem solchen Aufbau der Physik. Skizze der Ziele und der Struktur von Janichs Protophysik der Zeit und der wichtigsten immanenten Kriterien ihrer Beurteilung. II. Referat und immanente Kritik seiner grundlegenden Definition . III. Ein konstruktivistischer Vorschlag zur Verbesserung von und zu einem akzeptablen Realisationsverfahren für sie. Eigentümlichkeiten dieses Realisationsverfahrens lassen bereits erwarten, daß Janichs 'Eindeutigkeitsbeweis' einen Fehler haben muß. IV. Skizze des Weges von (...) bis zu den Forderungen für Uhren und dem angeblichen Eindeutigkeitsbeweis für diese. Untersuchung und Widerlegung dieses Beweises, mit dessen Haltbarkeit das ganze Unternehmen Janichs steht und fällt. (shrink)

Aim To explore the views in non-Western cultures about ending the lives of damaged newborns.Method 254 university students from India and 150 from Kuwait rated the acceptability of ending the lives of newborns with genetic defects in 54 vignettes consisting of all combinations of four factors: gestational age ; severity of genetic defect ; the parents’ attitude about prolonging care ; and the procedure used .Results Four clusters were identified by cluster analysis and subjected to analysis of variance. Cluster I, (...) labelled ‘Never Acceptable’, included 4% of the Indians and 59% of the Kuwaitis. Cluster II, ‘No Firm Opinion’, had little variation in rating from one scenario to the next; it included 38% of the Indians and 18% of the Kuwaitis. In Cluster III, ‘Parents’ Attitude+Severity+Procedure’, all three factors affected the ratings; it was composed of 18% of the Indians and 16% of the Kuwaitis. Cluster IV was called ‘Severity+Parents’ Attitude’ because these had the strongest impact; it was composed of 40% of the Indians and 7% of the Kuwaitis.Conclusions In accordance with the teachings of Islam versus Hinduism, Kuwaiti students were more likely to oppose ending a newborn's life under all conditions, Indian students more likely to favour it and to judge its acceptability in light of the different circumstances. (shrink)

The 1973 archeological discovery of important documents of classical thought known as the Huang-Lao Boshu coupled with advancements in contemporary jurisprudence make possible a reassessment of the philosophies of pre-Qin and early Han China. This study attempts to elucidate the importance of the Huang-Lao school within the intellectual tradition of China through a comparison of the Boshu's philosophical position, particularly its understanding of the relation between law and morality, with the respective views of major thinkers of the period--Confucius, Han Fei, (...) Lao Zi, Zhuang Zi, and to a lesser extent, Shen Dao, Shen Buhai and the authors of the Guan Zi and He Guan Zi. So doing reveals Huang-Lao to be a unique and sophisticated social and political philosophy which, until its expulsion from court by Emperor Wu and subsequent adoption by Daoist religion, served as the ideological foundation for the post-Qin reforms of the early Han. (shrink)

Understanding of organizational ethics phenomena requires complex understanding of organizational practices in their real world contexts. We can try to understand and build theory about these complex real world practices from the points of view of: a traditional deductive, ethics literature-based, literature gap formulation approach; or, an inductive, practitioner-based literature gap formulation approach. This consideration of inductive, practitioner-based versus deductive, literature-based literature gap formulation is related to the discussion concerning “engaged scholarship” and relationships and gaps between theory and practice in (...) organization studies [Van De Ven, 2007, Engaged Scholarship: A Guide for Organizational and Research Knowledge ]. However, there is an important difference with respect to the key issue of ethics literature versus practitioner-based literature gap formulation. This article offers examples of the two different approaches and makes comparisons between them. Implications for practice-based organizational ethics theory building, Ph.D. education, and public intellectual work are considered. (shrink)

Perhaps the most remarkable feature of the works in which Ausonius of Bordeaux and Libanius of Antioch, writing within a few years of each other, recall their long and varied careers is that there is so little resemblance between them; the impressions given by these experienced and successful teachers could hardly be more disparate. The reader of Ausonius finds in his Protrepticus a familiar enough picture of the terrors of the schoolroom; his Professores offer at first sight a series of (...) bland commemorations apparently deficient in the interesting information which might be expected from such an archive. Libanius' many volumes, on the other hand, compared where appropriate with the Vitae Sophistarum of Eunapius, present a situation which is well summarised by the following sentences from Walden's work The Universities of Ancient Greece : ‘There was, among the sophists of the fourth century…little, if any, of that spirit of brotherhood… that usually exists in a community of scholars at the present day. Instead there were jealousy, spite and often unrelenting hatred’. This striking divergence between Ausonius and his Eastern counterparts is unlikely to reflect a basic difference between East and West, or between Latin- and Greek-speaking milieux; the complaints of Augustine about his problems in Africa and Rome warn against such a simple answer. When one adds the evidence provided seven centuries later by the Frenchman Peter Abelard, whose plaintive Historia Calamitatum — an account of the disasters he suffered, not those which he caused — is remarkably similar to the prickly self-justification of Libanius in its account of bitter scheming and almost military manoeuvres in the educational world, one is forced to consider whether the evidence of Ausonius is not a serious anomaly, and to seek an explanation. (shrink)

In this article, we report findings from a qualitative study that explored how the relatives of intensive care unit patients experienced the nurses’ role and relationship with them in the end-of-life decision-making processes. In all, 27 relatives of 21 deceased patients were interviewed about their experiences in this challenging ethical issue. The findings reveal that despite bedside experiences of care, compassion and comfort, the nurses were perceived as vague and evasive in their communication, and the relatives missed a long-term perspective (...) in the dialogue. Few experienced that nurses participated in meetings with doctors and relatives. The ethical consequences imply increased loneliness and uncertainty, and the experience that the relatives themselves have the responsibility of obtaining information and understanding their role in the decision-making process. The relatives therefore felt that the nurses could have been more involved in the process. (shrink)

Several cases which have been considered by the courts in recent years have highlighted the legal dilemmas facing doctors whose decisions result in the ending of a patient's life. This paper considers the case of Dr Cox, who was convicted of attempting to murder one of his patients, and explores the roles of motive, diminished responsibility and consent in cases of "mercy killing". The Cox decision is compared to that of Tony Bland and Janet Johnstone, in which the patients were (...) in a persistent vegetative state. In all three cases, the doctors believed that their patients' quality of life was so poor that their continued existence was of no benefit to them, and decided that their lives should not be unduly prolonged, yet the doctor who was prosecuted was the one whose dying patient had requested that her death be hastened. The paper examines the law's seemingly contradictory approaches to such cases. (shrink)

Using the ideas of Clifford Geertz, Adolf Portmann, Charles Taylor, and others, I seek to develop and expand Polanyi’s account of language and its role in our human way of being bodily mindful in the world. The expansion of Polanyi’s ideas on language in the evolutionary rise of Homo sapiens and in the moral and mental development of the child does two things that I believe are important: (1) obviates the need to appeal to an incorporeal thinking substance - i.e., (...) dualism - to ground the reality of human transcendence, and (2) highlights the place of natural language in the irreducibility of human mentality. (shrink)

This paper reconsiders certain questions about Ausonius’ two incomplete works on historical themes, Fasti and Caesares, with particular attention to points raised in a recent article by R. W. Burgess. Of the Fasti we have only a few tantalizing snippets, the packaging and not the core: what did the work look like when it left Ausonius? What was its coverage? was it in verse or prose? The Caesares as we have it breaks off in mid-quatrain, at line 139: did it (...) go beyond Elagabalus? What of the evidence in Giovanni Mansionario that Ausonius treated certain imperatores from Decius to Diocletian? (shrink)

This essay gives a brief overview of Transhumanism and explores a few of its central ideas in the light of Polanyi’s views about embodiment, Marxism, and reality’s hierarchal order, concluding that although Polanyi would likely appreciate the possibilities of cyborgic augmentation that feature in the Transhumanist route to the posthuman, he would utterly repudiate its metaphysics of disembodied intelligence and its underlying technological determinism.

Interactive technology assessment (iTA) provides an answer to the ethical problem of normative bias in evaluation research. This normative bias develops when relevant perspectives on the evaluand (the thing being evaluated) are neglected. In iTA this bias is overcome by incorporating different perspectives into the assessment. As a consequence, justification of decisions based on the assessment is provided by stakeholders having achieved agreement. In this article, agreement is identified with wide reflective equilibrium to show that it indeed has the potential (...) of justifying decisions. We work out several conditions for this agreement to be achievable and just. (shrink)

It may seem faintly absurd to claim or imply that a Vergilian cento has suffered unjustified neglect from scholars. These works—of which there are sixteen, covering a period of over three centuries within Late Antiquity—are usually treated at best with amused tolerance, and at worst with angry disdain. Though always ingenious, sometimes funny, and occasionally informative about the reception of Vergil, they are seldom admired. Even among Italian scholars, some of whom have paid much attention to centos, a recession has (...) set in since the annus mirabilis of 1981, which saw two editions of the Medea of Hosidius Geta. Proba has, deservedly, attracted more attention than most; her aims and methods as a Christian poetess were carefully and illuminatingly studied twenty years ago by Reinhard Herzog, and her interest as a female Roman aristocrat has brought her further attention, especially in recent years. The main aim of the present article is to suggest a particular context and a serious purpose for her cento. A postscript will show that it went on to enjoy considerable popularity until the end of the century, and an introductory section will discuss its date, but very briefly, since Matthews has convincingly said most of what needs to be said about a recent attempt to redate it. Proba's preface, much of it not in cento form, calls for detailed treatment from various angles—textual, literary, historical—and will be explored in a separate article. (shrink)