Despite decades of research, remaining safety concerns regarding disease transmission, heterotopic tissue formation, and tumorigenicity have kept stem cell‐based therapies largely outside the standard‐of‐care for musculoskeletal medicine. Recent insights into trophic and immune regulatory activities of mesenchymal stem cells (MSCs), although incomplete, have stimulated a plethora of new clinical trials for indications far beyond simply supplying progenitors to replenish or re‐build lost/damaged tissues. Cell banks are being established and cell‐based products are in active clinical trials. Moreover, significant advances have also (...) been made in the field of pluripotent stem cells, in particular the recent development of induced pluripotent stem cells. Their indefinite proliferation potential promises to overcome the limited supply of tissue‐specific cells and adult stem cells. However, substantial hurdles related to their safety must be overcome for these cells to be clinically applicable. (shrink)

When hiring for an open position, the branch manager of Intermountain Trust Bancorp was challenged with an ethical dilemma he was not anticipating. An internal applicant challenged the hiring manager's ethical values by insisting that their friendship and other external employment factors be taken into consideration in the hiring decision. This is a classic case of a candidate using undue influence1 to manipulate a colleague and gain employment. In what started as a routine decision, the manager was faced with an (...) unforeseen ethical quagmire. This case describes a real situation that had local impact on the stakeholders of a regional bank, and provides a true example of the types of difficult situations that can affect candidate selection in hiring decisions. (shrink)

This article presents the case of an HIV-positive client who reported having sexual relations with an unknowing partner. The issue raised is whether the therapist was required to warn the unknowing partner, similar to the Tarasoff mandate that is imposed on therapists. The case is analyzed from an ethical framework similar to that presented by Beauchamp and Childress. Two opinions are presented, each leading to different conclusions about whether the therapist should inform the unknowing partner. It is concluded that although (...) such analysis is valuable in aiding the therapist in his or her decision-making process, no clear professional standard for the management of the problem is evident. (shrink)

Graphical AbstractIdentifying the properties and molecules of the intestinal microbiome may help our understanding of various diseases and therefore facilitate their treatment; from excluding pathogens to manipulation of the immune system and regulation of non-intestinal sites.

Weiss, Propen, and Reid gather a diverse group of scholars to analyze the growing obsolescence of the human-object dichotomy in today's world. In doing so, Design, Mediation, and the Posthuman brings together diverse disciplines to foster a dialog on significant technological issues pertinent to philosophy, rhetoric, aesthetics, and science.

This article begins with an explanation of how moral development for organizations has parallels to Kohlberg's categorization of the levels of individual moral development. Then the levels of organizational moral development are integrated into the literature on corporate social performance by relating them to different stakeholder orientations. Finally, the authors propose a model of organizational moral development that emphasizes the role of top management in creating organizational processes that shape the organizational and institutional components of corporate social performance. This article (...) represents one approach to linking the distinct streams of business ethics and business-and-society research into a more complete understanding of how managers and firms address complex ethical and social issues. (shrink)

Research on language processing has shown that the disruption of conceptual integration gives rise to specific patterns of event-related brain potentials —N400 and P600 effects. Here, we report similar ERP effects when adults performed cross-domain conceptual integration of analogous semantic and mathematical relations. In a problem-solving task, when participants generated labeled answers to semantically aligned and misaligned arithmetic problems, the second object label in misaligned problems yielded an N400 effect for addition problems. In a verification task, when participants judged arithmetically (...) correct but semantically misaligned problem sentences to be “unacceptable,” the second object label in misaligned sentences elicited a P600 effect. Thus, depending on task constraints, misaligned problems can show either of two ERP signatures of conceptual disruption. These results show that well-educated adults can integrate mathematical and semantic relations on the rapid timescale of within-domain ERP effects by a process akin to analogical mapping. (shrink)

Teaching through discussion is perhaps the most fundamental pedagogical technique of philosophy. When done well, discussion can promote long-term, durable learning. It supports an active-learning classroom, sparks higher-order cognition, and helps students construct their own understanding of the material. Yet it is often not done well: it is easily dominated by a few students; it can waste time on tangents and minutiae; it can fail to motivate students to prepare adequately; and it is not easily scalable. In this paper we (...) present a technique, the random discussion leader (RDL), which addresses all of these shortcomings of traditional discussion. Qualitative and quantitative evidence from our quasi-experimental study (n = 279) suggests that RDL leads to better preparation, better engagement with the material, more equitable participation, and higher quality discussions. Additionally, we provide a toolkit for instructors interested in trying RDL, showing how the technique can be adapted to various course settings and materials. (shrink)

This chapter contains sections titled: Mere Social Conventions Pseudo‐Pathologies Pathologies and Decisions Pathology and Utility.

This article suggests a way to circumvent some of the problems that follow from the lack of consensus on a definition of emotion (Izard, 2010; Kleinginna & Kleinginna, 1981) and emotion regulation (Cole, Martin, & Dennis, 2004) by adopting a conceptual framework based on discrete emotions theory and focusing on specific emotions. Discrete emotions theories assume that neural, affective, and cognitive processes differ across specific emotions and that each emotion has particular motivational and regulatory functions. Thus, efforts at regulation should (...) target the specific dysregulated emotions. The positive effects of emotion regulation are more likely to be optimized when they result from or lead to emotion utilization—the constructive use of the energy of emotion arousal. Effective processes for regulation differ for basic emotions and emotion schemas. This article identifies neural systems that facilitate emotion experiences and emotion regulation processes. It considers the implications of the developmental change from basic emotions to emotion schemas, and also briefly discusses the effects of interventions on changes in emotion knowledge, emotion regulation, and social and emotional competence. (shrink)

Many emotion researchers would probably agree that at least some aspects of discrete emotions are evolutionarily conserved (e.g., the sensation/feeling component cannot be learned). Such agreement probably extends to the notion that aspects of emotions emerge in ontogeny as a function of developmental, learning, and cultural processes. Determining when and under what circumstances they emerge seems largely a matter for empirical research, though theories differ in their predictions and in the way they describe the relevant emotional-, cognitive-, and neuro-developmental processes.

This book advertises itself as an exploration of the world-time parallel, that is, the parallel between the modal dimension, on the one hand, and the temporal dimension, on the other. It is that, and much more. As the authors point out, there is reasonable agreement that we can model times, through temporal logic, in ways that are analogous to those by which we model modality through the logic of possible worlds. But this formal parallel has almost universally been taken to (...) be a merely formal parallel: thus it is held that no metaphysical conclusions ought to be drawn from it. Thus, it is generally thought that one is free to accept an argument for actualism, say, but to reject a parallel argument for presentism. Rini and Cresswell compellingly argue that this is a mistake: the temporal and the modal are more than merely formally analogous. (shrink)

Hoerl & McCormack posit two systems – the temporal updating system and the temporal reasoning system – and suggest that they explain an inherent contradiction in people's naïve theory of time. We suggest there is no contradiction. Something does, however, require explanation: the tension between certain sophisticated beliefs about time, and certain phenomenological states or beliefs about those phenomenological states. The temporal updating mechanism posited by H&M may contribute to this tension.

The scenario is becoming achingly familiar to me: a woman in her fifties with no health insurance suffers a stroke. With luck, it is a small stroke—a "warning sign." But the patients I'm likely to see as a rehabilitation physician are usually not that lucky. The stroke is invariably large, causing significant disability. And the other familiar part of this scene? While treating her, I discover, unbeknownst to the patient, that her blood sugar and blood pressure are out of control. (...) Undoubtedly, the undiagnosed hypertension and diabetes contributed to the stroke.So what's the back story? Perhaps she works a job that doesn't provide insurance, or she can't afford the premiums. She has mouths to feed, rent to pay, and .. (shrink)

Dear Kris, -/- I know you will read this letter if it ever manages to get to you. You like reading. -/- I’m not sure what you’ll think of it though. I just know I had to make this attempt to talk to you about the summer of 1984. -/- There are some things you and I come to know in the summer of 1984 that will take us 35 years to learn to talk about. They were not an easy (...) 35 years. And I want to help change that. (shrink)

Ross Cameron’s the moving spotlight reminds me a bit of Pirates of the Caribbean. Although there are no pirates, it’s a rip roaring swashbuckling adventure. It’s a wild ride. Truth be told, many of us will probably conclude that it’s no more plausible an account of our world than is Pirates of the Caribbean a faithful depiction of piracy. I’m not a moving spotlight theorist. There aren’t many of them out there. I’m not even an A-theorist, though there are plenty (...) of those. And there was little chance that this book would convert me. But for all that it’s well worth the read; because even if you come away from the book holding onto the same view of time as you had going in, you will certainly learn something along the way. (shrink)

_Humanizing Education_ offers historic examples of humanizing educational spaces, practices, and movements that embody a spirit of hope and change. From Dayton, Ohio, to Barcelona, Spain, this collection of essays from the _Harvard Educational Review_ carries readers to places where people have first imagined—and then organized—their own educational responses to dehumanizing practices and conditions. Contributors include Montse Sánchez Aroca, William Ayers, Kathy Boudin, Fernando Cardenal, Jeffrey M. R. Duncan-Andrade, Marco Garrido, Jay Gillen, Maxine Greene, Kathe Jervis, Nancy Uhlar Murray, Valerie (...) Miller, Wendy Ormiston, Ana Y. Ramos-Zayas, Vanessa Siddle Walker, Arthur E. Thomas, and Travis Wright. (shrink)

Rapid growth in structural and functional brain research has led to increasing ethical discussion of what to do about incidental findings within the brains of healthy neuroimaging research participants that have potential health importance, but which are beyond the original aims of the study. This dilemma has been widely debated with respect to general neuroimaging research but has attracted little attention in the context of neuromarketing studies. In this paper, I argue that neuromarketing researchers owe participants the same ethical obligations (...) as other neuroimaging researchers. The financial resources available to neuromarketing firms and the social value of neuromarketing studies should command greater attention to the elucidation and management of incidental findings. However, this needs to be balanced against finite resources available within most public health systems. (shrink)

Americans have always been divided over whether to welcome or to discourage immigration. But virtually all American leaders have rested their views on notions that the United States has unique providential or world-historical significance-as an asylum for the world's oppressed, as a model to the world, or even as the world's leader. Today, it is normatively desirable for the U.S. to view itself not as the world's "city on a hill" but simply as one worthy political society among many others. (...) Whether such a view can be made politically appealing to most Americans, however, remains in doubt. (shrink)

This essay examines Hume’s treatment of money in light of his view of the imagination. It begins with his claim that money is distinct from wealth, the latter arising, according to vulgar reasoning, from the power of acquisition that it represents, or, understood philosophically, from the labor that produces it. The salient features that Hume identifies with the imagination are then put forth, namely its power to combine ideas creatively and the principle of easy transition that characterizes its movement among (...) them. Two issues that these features explain are then discussed: first, why people take value to lie in the material of which money is made, and, second, why they assign value to what they take money to represent, namely, wealth. In both cases, the imagination creates a new relation, an illusion or fiction, that cannot be traced directly to experience. In the case of money, the faculty conjoins what is intangible (the power of acquisition) with the physical qualities of specie; in the case of property it produces a causal relation that connects persons with objects to constitute stable possession that constitutes ownership. Hume also appeals to the imagination to explain the rules of property that subsequently develop (present possession, occupation, prescription, and transference). The essay concludes by emphasizing that being based on the imagination is not in itself indicative of any instability in either money or property and the practices they enshrine, a feature they share with other phenomena (such as the self and continued existence) that Hume also traces to the same faculty. (shrink)

This paper examines the role of reason in Shepherd's account of acquiring knowledge of the external world via first principles. Reason is important, but does not have a foundational role. Certain principles enable us to draw the required inferences for acquiring knowledge of the external world. These principles are basic, foundational and, more importantly, self‐evident and thus justified in other ways than by demonstration. Justificatory demonstrations of these principles are neither required, nor possible. By drawing on textual and contextual evidence, (...) I will show that Shepherd should have said that we know the first principles of any science, in general, and that “everything which begins to exist must have a cause”, in particular, via intuition, not via reason. Reasoning about such principles can help their self‐evidence shine through in certain cases; their justification, and our being justified in believing them, does not come from this reasoning, however. (shrink)

While most of the mortality associated with severe acute respiratory syndrome coronavirus 2 has been in elderly populations and adults with significant medical comorbidities, there has been death and morbidity in paediatric populations. As vaccine trial data is released to the public, many people look to the future with hope ; with good vaccine uptake there is the opportunity to reduce the spread of infectious pandemics. Initial vaccine trials were completed with adults and were expanded to include paediatric populations delaying (...) paediatric COVID-19 vaccine initiatives. The exclusion of children from initial vaccine trials during a pandemic is not morally justifiable and fosters distrust with the pharmaceutical and medical industries and inevitably postpones vaccinating children when there is a surplus of available vaccines. The delayed vaccination of children under twelve may have significant public health and economic consequences as there may be ongoing viral transmission in the context of reopening strategies. The safety and efficacy of these candidate vaccines in children should be assessed expeditiously so that distribution to vulnerable paediatric populations is not impacted. Vaccine uptake compliance in the general population is important in establishing herd immunity and ensuring that there is thorough scientific evidence to support vaccination for children is important in establishing community trust. (shrink)

Among the shining examples of the panhellenic spirit of Athens in the spacious days of the Persian Wars, which Attic orators of the fourth century were fond of parading before their degenerate audiences, was an act of the Athenian Ecclesia, by which one Arthmius of Zeleia was declared an outlaw in the territory of Athens and her allies, ‘for that he had brought the gold from Media into Peloponnesus.’ This Psephisma is cited twice over in the speeches of Demosthenes. On (...) the principle that the Devil may quote Scripture, Aeschines cast it back into Demosthenes' teeth. From Aeschines we learn further that Arthmius had visited Athens in the course of his errand, and that he had narrowly escaped execution at the hands of the irate citizens. The proceedings against Arthmius were also recorded by Dinarchus, by Plutarch and by Aelius Aristides. (shrink)

Henry Odera Oruka was one of the most influential figures in 20th-century African philosophy. During the early years of the decolonization of African countries, as universities worked to redefine themselves, Odera drove changes to curricula and research. A tireless advocate for democracy and human rights in Africa, he repeatedly intervened in the political debates of his time. -/- This is the first critical biography of both the man himself and African philosophy in the context of changing times, taking us through (...) his early life, scholarly training, and Oruka's way of transforming the field of philosophy as it was taught in Kenya. -/- The narrative unfolds from the personal to the global, from Africa to the world, and from African philosophy to the wider field of philosophy. Biographical material is woven with narratives of the social conditions and live questions as they arise in Oruka's life in Kenya, Sweden, and the United States. We are introduced to his understanding of philosophy as a critique of society. Exposing prison practices in Africa and targeting capitalists, Oruka sought to remedy social problems on a global scale, from institutional racism and ethnic division to the wealth gap between rich and poor nations. -/- Through archival material, personal interviews and primary texts, this book shines a light on Oruka's monumental contribution to African philosophy and global justice. Finally we can see how Oruka's insights are still relevant to how we think about poverty, philosophy and human rights today. (shrink)

Since antiquity, scholars have observed a structural tension within Plato’s Phaedrus. The dialogue demands order in every linguistic composition, yet it presents itself as a disordered composition. Accordingly, one of the key problems of the Phaedrus is determining which—if any—aspect of the dialogue can supply a unifying thread for the dialogue’s major themes (love, rhetoric, writing, myth, philosophy, etc.). My dissertation argues that “soul-leading” (psuchagōgia)—a rare and ambiguous term used to define the innate power of words—resolves the dialogue’s structural tension. (...) I clarify the conceptual and dramatic features of soul-leading by focusing on the dialogue’s uniquely prevalent use of the semantic network of “leading” and “following.” By continuing to foreground the language and drama of leading and following, I offer a new interpretation of the dialogue as a whole: the Phaedrus is Plato’s articulation of how the soul can be led into communion with reality. Chapter 1 discusses scholarly disputes about the unity of the Phaedrus and proposes that soul-leading adequately satisfies the criteria put forward for what would count as a unifying element. I argue that soul-leading unifies the dialogue both thematically and non-thematically; moreover, soul-leading is a theme capacious enough to account for the other principal contenders for unity put forward. Chapter 2 develops the ambiguous character of soul-leading by examining how the dialogue showcases dangerous forms thereof. Love and language are dangerous when they lead the soul toward goods which can never truly fulfill it. In order to clarify how love and language can mislead the soul, Socrates develops a set of accounts of how the soul is led, both internally and externally, in the three speeches on love. If the soul is to be led into communion with reality (the proper end of soul-leading), it must be led internally by the right part of the soul and externally by the right object of desire. Chapter 3 argues that all souls can, in principle, be harmonized and directed in the way that Chapter 2 requires. I show that Plato’s view of philosophy is neither elitist (i.e., some are intrinsically incapable of philosophy) nor naively essentialist. All can come into communion with reality because all are by nature equipped to do so. While Plato recognizes that there are forces which tend to prohibit one from exercising one’s capability of being rightly led, none of them are intrinsic to human nature. Chapter 4 argues that successful soul-leading require neither the leader nor the follower to be already well-disposed to what’s ultimate in order for the pair to come to a communion with what’s ultimate. Plato’s depiction of soul-leading love shows that love can itself promote the formation needed for both leader and follower to come into contact with reality. Love can do so because it is always already bound up reality in its responsiveness to beauty. Beauty itself calls the lover to itself by shining through the beautiful beloved, who acts as a reminder of transcendent Beauty. The lover mediates this same experience for the beloved. Each comes to desire the other as well as Beauty itself. Chapter 5 argues that the drama of the lovers’ formation mythically depicted in the Palinode (Chapter 4) is written into the drama of the dialogue as a whole. In the relationship between Socrates and Phaedrus, we see an enactment of love’s formative role. Likewise, in the relationship between Phaedrus and Lysias, we see an enactment of the dangerous soul-leading discussed in Chapter 2. My focus on leading and following also allows me to show the thematic significance of the drama’s setting. Chapter 6 articulates the metaphysical conditions under which one can be led into communion with reality. Transcendent Beauty invites us into communion with itself and makes possible our ascent by providing us with divine guides and images which can transport us from our ordinary experiences to the true beings. Beauty accomplishes its work—leading us in a “divine dance” where we follow the gods up to Beauty and back down to each other—through images. When we handle images of reality rightly, they lead our souls into communion with reality. Further, when we have come into communion, we’ll be inspired to be co-workers of Beauty’s soul-leading work. When we articulate reality in language, we create new images that can serve to lead others toward reality. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Reviewed by:Charles Faulkner Bryan: His Life and MusicTerese M. VolkCarolyn Livingston, Charles Faulkner Bryan: His Life and Music ( Knoxville, TN: University of Tennessee Press, 2003)There are many biographical studies in music education history.1 Indeed, it seems one of the easiest fields in historical research to mine—that is, until the researcher finds him or herself in the midst of what could be a years-long endeavor. Then the choice is (...) to commit to the research or quit. Carolyn Livingston did not quit. Her research began in 1981, continued through twenty years of investigations, interviews, library searches, and analyses, and has culminated in Charles Faulkner Bryan: His Life and Music. This book is not just the usual sequence of events in the life of a musician. Rather, it is more like becoming acquainted with someone you have never met before, yet feel comfortable with immediately. Charles Faulkner Bryan is genuinely likeable, and Livingston brings the person of Bryan to the fore and lets his humanity shine through his life and his music.Charles Faulkner Bryan: His life and Music is divided into two sections (pre- and post-WWII), each with four chapters. Livingston looks at this musician from several perspectives: the composer, the educator, the researcher, and the man. Appalachian folk music is the theme that connects the chapters, as it connected the events in Bryan's life. [End Page 211]Chapter 1 focuses on Bryan's youth, during which he and his family discovered his musical abilities. From performing at school, to building his own "turtle uke,"2 to his studies at the Nashville Conservatory of Music, Livingston describes the family support behind his developing musicality. Chapter 2 shows the reader his humanity even more clearly. Livingston tells of his early career as a music educator at the Tennessee Polytechnic institute; his marriage; and his mentorship of a young Black singer, J. Robert Bradley. That Bryan, a white Southerner, gave voice lessons to Bradley was not only generally unheard of with segregation as it was in the United States during the 1930s, but was dangerous to his career as well. Bryan moved on to teach at Peabody College in Nashville and then worked for the Works Progress Administration (WPA) Music Program on the Tennessee Music Project. Later he became the assistant state coordinator for the Tennessee State Defense Council. During both of these service positions, he called for music education improvements in Tennessee. Commenting on his work during this period, Livingston says, "Bryan was both of his time and ahead of his time... grounded in reality and yet visionary."3In Chapter 3, Livingston gives the reader a review of the "status of folk music scholarship and performance" as it existed in the 1930s.4 She takes pains to introduce the folk music researchers and musicians who influenced Bryan in his work with Appalachian folk music: Lucien L. McDowell and Flora Lassiter McDowell, George Pullen Jackson, Charles Seeger, and John Jacob Niles. These connections and friendships were to influence his awareness of Appalachian folk music and would continue for the rest of his life. By 1945 he had come to be considered an authority on folk music in his own right and his vision of this music came to encompass "the ultimate meaning in representing America itself."5Chapter 4 traces Bryan's development as a composer. It is in this chapter that Livingston begins to incorporate analyses of Bryan's most popular compositions. Her reviews of these compositions are clear and detailed without being overly theoretical. Some of the selections she analyzes include "Charlottown," "The Ballad of the Harp Weaver," and the White Spiritual Symphony. The Symphony in particular shows his respect for the folk songs he incorporated in this composition. Indeed, as Livingston points out several times, he maintained the integrity of these songs in all his compositions and performances. Chapter 4 concludes with Bryan's academic achievements: a Guggenheim Fellowship for music composition and his acceptance at Yale University to study composition under Hindemith.Livingston continues the discussion and analyses of Bryan's compositions in Chapter 5, detailing his time at Yale. His completed choral works from this period include the "Bell... (shrink)

The Céli Dé monks as we see them in the texts associated with their monasteries had a reputation for extreme asceticism. Following their leader, MáelRúain, who had an especially stern reputation for rigorous observance, they believed heaven had to be earned by saying many prayers, by penitential practices and by intense personal effort and striving on the part of each individual monk. To this end, they engaged in such practices as rigorous fasting, long vigils, confession of sins, strict Sabbath observance (...) and devotional practices involving many prayers. Their view of humanity and of creation generally was negative and they saw God as a stern judge. However, there was another aspect to Céli Dé monasticism which we see in the Félire Óengusso, the metrical martyrology compiled by Óengus the Culdee, a monk of Tallaght. We see from his Félire that he understood holiness as a gift of God’s grace, both for the saints in heaven, whom he describes as ‘radiant’ and ‘shining like the sun’, and for those still on earth, through the mercy and graciousness of God himself. His Félire was compiled as an act of devotion to Jesus and the saints, whom he addresses in terms of great warmth, tenderness and intimacy, in expressions which prefigure the language of the medieval mystics. So by studying the lives of these two monks, MáelRúain and Óengus, his protégée, as case studies, we can see that for the Céli Dé, holiness was less a matter of ‘either asceticism or mysticism’, but rather ‘both and’. (shrink)

Haunting us with such unforgettable stories as The Shining, Shawshank Redemption, Salem s Lot, Carrie, The Green Mile, and Pet Semetary, Stephen King has been an anchor of American horror, science fiction, psychological thrillers, and suspense for over forty years. His characters have brought chills to our spines and challenged our notions of reality while leaving us in awe of the perseverance of the human spirit. As the first book in the new Great Authors and Philosophy series, Stephen King and (...) Philosophy reveals some of the deeper issues raised by King s work. From retribution, freedom, and moral relativity, to death and insanity, the chapters of this book expose how King s stories access the questions and fears that nag each of us in the middle of night.". (shrink)

Terrence Malick’s The Thin Red Line is an anti-war film which can be read as an Orphic narrative meditating on the relationship between humans and “nature.” Many scholarly readings of the film have been attracted by analyzes that explore the influences of Cavell and Heidegger on Malick. Kaja Silverman’s recent opus, Flesh of My Flesh, contains a chapter titled “All Things Shining.” She elegantly examines how Malick’s film explores the theme of “finitude.” She argues that, ontologically speaking, human existence gains (...) a more intense “glow” when humans are made aware of their mortality. The present becomes paramount. But like Orpheus, the present seeks to make amends with the past. Taking Silverman’s analysis one step further involves exploring finitude through the film’s many animal, arboreal and geological images. Nature can be read as a “margin” that more fully enhances the film’s exploration of connection and finitude. To this end, the opening chapter of Jacques Derrida’s Margins of Philosophy is invaluable. Entitled “Tympan,” Derrida’s introductory essay introduces a wealth of ecological metaphors. These stimulate an interaction between Silverman’s model of finitude, Derrida’s surprising ecologies at the margin and Malick’s quest for what shines in all beings. (shrink)

Ecologists are challenged by the need to bridge and synthesize different approaches and theories to obtain a coherent understanding of ecosystems in a changing world. Both food web theory and regime shift theory shine light on mechanisms that confer stability to ecosystems, but from different angles. Empirical food web models are developed to analyze how equilibria in real multi-trophic ecosystems are shaped by species interactions, and often include linear functional response terms for simple estimation of interaction strengths from observations. (...) Models of regime shifts focus on qualitative changes of equilibrium points in a slowly changing environment, and typically include non-linear functional response terms. Currently, it is unclear how the stability of an empirical food web model, expressed as the rate of system recovery after a small perturbation, relates to the vulnerability of the ecosystem to collapse. Here, we conduct structural sensitivity analyses of classical consumer-resource models in equilibrium along an environmental gradient. Specifically, we change non-proportional interaction terms into proportional ones, while maintaining the equilibrium biomass densities and material flux rates, to analyze how alternative model formulations shape the stability properties of the equilibria. The results reveal no consistent relationship between the stability of the original models and the proportionalized versions, even though they describe the same biomass values and material flows. We use these findings to critically discuss whether stability analysis of observed equilibria by empirical food web models can provide insight into regime shift dynamics, and highlight the challenge of bridging alternative modelling approaches in ecology and beyond. (shrink)

Anaximander is the first philosopher whose theory of the heavens is preserved in broad outlines. According to the sources the celestial bodies are huge rings of compressed air around the earth, each visible only where it is perforated by a tubular vent through which the fire contained in it can shine. Greatest and farthest of them is the sun, next comes the moon and under them there is the ring of the stars. It is a common practice to put (...) and answer the following questions: ‘…why he should have placed the stellar circles or rings closer to the earth than are the sun and the moon.’ ‘…why these lower rings of stellar ρ do not obscure the brighter but more distant bodies.’. (shrink)

The setting is a garden in Elysium. The sun is shining. A rich verdant lawn is surrounded by flower beds and flowering bushes, with a grove of magnificent trees behind. Beyond, a large lake and in the distance high mountains. Five comfortable garden chairs are placed in the shade of some trees. There is a low table on which are placed a wine decanter and glasses, three of which are half full. Richard, Jill and Frank are deep in discussion.

While thinking philosophically we see problems in places where there are none. It is for philosophy to show that there are no problems.Those of us who are not colour blind have a happy command of colour concepts. We say of trees that they are green in spring, that they are the same colour as grass and a different colour from the sky. If we shine a torch with a red bulb upon a white surface, we say that the surface (...) looks pink although it is white. And if we suffer a bout of jaundice we claim that white things look yellowish to us, although they are not yellow, nor do they look yellow. We employ this tripartite distinction unworriedly and unthinkingly. But when, in doing philosophy, we are called upon to elucidate colour concepts it becomes evident that these elementary concepts present intricate problems to the philosophical understanding. It is extraordinarily difficult to obtain a proper surview of colour grammar, and the temptations of philosophical illusion are legion. We go wrong before the first step is even taken, and hence do not notice our errors, for they are implicit in every move we make. We multiply impossibilities seriatim, getting better, like the White Queen, with practice. We then either slide into scepticism, or alternatively exclude it on empirical grounds - appealing, as is so popular in American philosophical circles, to the wonders of science, in particular physics and neurophysiology, to keep the malin genie from the door. (shrink)