In the heterothallic species Neurospora crassa, strains of opposite mating type, A and a, must interact to give the series of events resulting in fruiting body formation, meiosis, and the generation of dormant ascospores. The mating type of a strain is specified by the DNA sequence it carries in the mating type region; strains that are otherwise isogenic can mate and produce ascospores. The DNA of the A and a regions have completely dissimilar sequences. Probing DNA from strains of each (...) mating type with labelled sequences from the A and the a regions has shown that, unlike in Saccharomyces cerevisiae, only a single copy of a mating type sequence is present in a haploid genome. The failure to switch is explainable by the physical absence of DNA sequences characteristic of the opposite mating type. While the mating type sequences must be of the opposite kind for mating to occur in the sexual cycle, two strains of opposite mating type cannot form a stable heterokaryon during vegetative growth; instead, they fuse abortively to give a heterokaryon incompatibility reaction, which results in death of the cells along the fusion line. The DNA sequences responsible for this reaction are coextensive with those sequences in the A and a regions which are necessary to initiate fruiting body formation. The genus Neurospora also includes homothallic species – ones in which a single haploid nucleus carries all the information necessary to form fruiting bodies, undergo meiosis, and produce new haploid spores. One such species, N. terricola, contains one copy each of the A and the a sequences within each haploid genome. Another homothallic species, N. africana, contains a single copy of the A sequence in the haploid genome, but does not contain any sequences corresponding to the a sequence. We present a model for the role of the mating type‐specific sequences in heterothallic and homothallic species of Neurospora and we speculate on the origin of the different modes of reproduction in the genus Neurospora. (shrink)

Competition between scientific hypotheses is not always a matter of mutual exclusivity. Consistent hypotheses can compete to varying degrees either directly or indirectly via a body of evidence. We motivate and defend a particular account of hypothesis competition by showing how it captures these features. Computer simulations of Bayesian inference are used to highlight the limitations of adopting mutual exclusivity as a simplifying assumption to model scientific reasoning, particularly due to the exclusion of hypotheses that may be true. We end (...) with a case study demonstrating the subtleties involved in hypothesis competition in scientific practice. (shrink)

Philosophers and psychologists are increasingly investigating the conditions under which multiple explanations are better in conjunction than they are individually. This book brings together leading scholars to provide an interdisciplinary and unified discussion of such "conjunctive explanations." The book starts with an introductory chapter expounding the notion of conjunctive explanation and motivating a multifaceted approach to its study. The remaining chapters are divided into three parts. Part I includes chapters on "The Nature of Conjunctive Explanations." Each chapter illustrates distinct ways (...) in which explanatory multiplicity is motivated by a careful study of the nature and concept of explanation. The second part ("Reasoning about Conjunctive Explanations") includes chapters on the epistemology and logic of conjunctive explanations. Here the contributors propose and evaluate various norms for reasoning correctly about and to conjunctive explanations. Part III concerns "The Psychology of Conjunctive Explanations," with contributions discussing conditions under which humans entertain and hold multiple explanations of single explananda simultaneously and the cognitive limitations and capacities for doing so. Conjunctive Explanations will be of interest to researchers and advanced students working on explanation in philosophy of science, epistemology, philosophical logic, and cognitive psychology. (shrink)

Background: Fear of cancer recurrence or progression is a common challenge experienced by people living with and beyond cancer and is frequently endorsed as the highest unmet psychosocial need amongst survivors. This has prompted many cancer organizations to develop self-help resources for survivors to better manage these fears through psychoeducation, but little is known about whether they help reduce FCR/P.Method: We recruited 62 women with ovarian cancer. Women reported on their medical history and demographic characteristics and completed the Fear of (...) Progression Questionnaire-Short Form. They then read a booklet on FCR specifically created for Ovarian Cancer Australia by two of the authors. One week after reading the booklet, 50/62 women completed the FoP-Q-SF and answered questions about their satisfaction with the booklet.Results: More than half of the women scored in the clinical range for FCR/P at baseline. Of the completers, 93% said that they would recommend the booklet to other women. Satisfaction with the booklet was relatively high and more than two-thirds of women rated it as moderately helpful or better. However, FCR/P did not change significantly over the week following reading the booklet [t = 1.71, p = 0.09]. There was also no difference in change in FCR/P between women in the clinical vs. non-clinical range on the FoP-Q. Women high in FCR/P rated the booklet as less helpful in managing FCR/P, but overall satisfaction with the booklet was not associated with degree of FCR/P.Conclusions: These results suggest that a simple online FCR booklet is acceptable to women with ovarian cancer and they are satisfied with the booklet, but, it was insufficient to change in FCR/P levels. These results suggest that such resources are valued by women with ovarian cancer, but more potent interventions are necessary to reduce FCR in this population. (shrink)

We have synthesized a 582,970-base pair Mycoplasma genitalium genome. This synthetic genome, named M. genitalium JCVI-1.0, contains all the genes of wild-type M. genitalium G37 except MG408, which was disrupted by an antibiotic marker to block pathogenicity and to allow for selection. To identify the genome as synthetic, we inserted "watermarks" at intergenic sites known to tolerate transposon insertions. Overlapping "cassettes" of 5 to 7 kilobases (kb), assembled from chemically synthesized oligonucleotides, were joined by in vitro recombination to produce intermediate (...) assemblies of approximately 24 kb, 72 kb ("1/8 genome"), and 144 kb ("1/4 genome"), which were all cloned as bacterial artificial chromosomes in Escherichia coli. Most of these intermediate clones were sequenced, and clones of all four 1/4 genomes with the correct sequence were identified. The complete synthetic genome was assembled by transformation-associated recombination cloning in the yeast Saccharomyces cerevisiae, then isolated and sequenced. A clone with the correct sequence was identified. The methods described here will be generally useful for constructing large DNA molecules from chemically synthesized pieces and also from combinations of natural and synthetic DNA segments. 10.1126/science.1151721. (shrink)

With this issue we initiate the policy of expanding the scope of Tulane Studies in Philosophy to include, in addition to the work of members of the department, contributions from philosophers who have earned advanced degrees from Tulane and who are now teaching in other colleges and universities. The Editor THE LOGIC OF OUR LANGUAGE ROBERT L. ARRINGTON Wittgenstein wrote in the Tractatus that "logic is not a body of doctrine, but a mirror-image of the world. " 1 In line (...) with his suggestion that a proposition is a 'picture', Wittgenstein argued that propositions 'show' the logical structure of the real. He was insistent, however, that "the apparent logical form of a proposition need not be its real one. " 2 As a result of this we can misunderstand the structure of fact. Philosophical problems arise just when "the logic of our language is mis understood. " 3 It is common knowledge that much of this view of logic was rejected by Wittgenstein himself in the Philosophical Investi gations. There we are told that language has no ideal or sublime 4 logic which mirrors the structure of the extra-linguistic world. Consequently, inferences from the structure of language to the structure of that extra-linguistic world are invalid. Reality can be 'cut up' in any of a number of ways by language. Wittgenstein adopted a view of philosophy which would render that discipline a non-explanatory, non-critical study of the multiple ways in which language can be used. (shrink)

Following the publication of her 2017 book, Unthought: The Power of the Cognitive Nonconscious, N. Katherine Hayles discusses the themes of the book with Louise Amoore and Volha Piotukh. From the development of a theory of nonconscious cognition, to the capacities of novels to enact the connections between disparate phenomena, Hayles reflects on what is at stake ethically in new human-technical assemblages.

In our contemporary moment, when machine learning algorithms are reshaping many aspects of society, the work of N. Katherine Hayles stands as a powerful corpus for understanding what is at stake in a new regime of computation. A renowned literary theorist whose work bridges the humanities and sciences among her many works, Hayles has detailed ways to think about embodiment in an age of virtuality, how code as performative practice is located, and the reciprocal relations among human bodies and technics. (...) This special issue follows the 2017 publication of her book Unthought: The Power of the Cognitive Nonconscious, in which Hayles traces the nonconscious cognition of biological life-forms and computational media. The articles in the special issue respond in different ways to Hayles’ oeuvre, mapping the specific contours of computational regimes and developing some of the ‘inflection points’ she advocates in the deep engagement with technical systems. (shrink)

The coronavirus disease pandemic fundamentally disrupted humans’ social life and behavior. Public health measures may have inadvertently impacted how people care for each other. This study investigated prosocial behavior, its association well-being, and predictors of prosocial behavior during the first COVID-19 pandemic lockdown and sought to understand whether region-specific differences exist. Participants from eight regions clustering multiple countries around the world responded to a cross-sectional online-survey investigating the psychological consequences of the first upsurge of lockdowns in spring 2020. Prosocial behavior (...) was reported to occur frequently. Multiple regression analyses showed that prosocial behavior was associated with better well-being consistently across regions. With regard to predictors of prosocial behavior, high levels of perceived social support were most strongly associated with prosocial behavior, followed by high levels of perceived stress, positive affect and psychological flexibility. Sociodemographic and psychosocial predictors of prosocial behavior were similar across regions. (shrink)

There has been strong interest in intergenerational arts practice in the United Kingdom since the 1980s; however, there is a generally weak evidence base for the effectiveness of intergenerational practice regardless of the domain. The aim of this study was to investigate the outcomes of an intergenerational arts project on participants’ social and psychological well-being using a mixed-methods, short-term longitudinal design. Generations Dancing brought together community artists with students (n = 25) and older adults (n = 11) living in Bedford. (...) Over an 11-week period, participants worked together to produce a new dance performance and photography exhibition. Focus groups were conducted with the participants to explore their feelings about the collaboration across generations and communities. Participants also completed a battery of questionnaires preproject and postproject, to assess any change in their levels of well-being. Results indicate that the older adults showed increased confidence and willingness to connect with others; they got immense enjoyment from talking about their experience with others. Furthermore, the project helped to address negative stereotypes that the older adults had of working with the young people. The older adults enjoyed the students’ company and felt encouraged and supported by the young people. While a small number of challenges were identified, including difficulties in traveling to the workshops for vulnerable participants, most challen... (shrink)

Le réseau n’est pas un support médiatique de plus, mais un environnement voué à contenir et transformer l’ensemble des médiations. La matière première de cet environnement est constituée par les traces que nous déposons, consciemment ou non, au gré de nos communications. Nouvelle monnaie d’une économie de l’attention, ces traces induisent des formes de contrôle inédites et paradoxales,...

Works by one of the most important artists working in America today—photographs, collaborative projects, ephemeral objects, and trenchant and witty institutional critique. For the past two decades Louise Lawler has been taking photographs of art in situ, from small poignant black-and-white images of art in people's homes to large format glossy color pictures of art in museums and in auction houses. In addition she has produced a variety of objects—paperweights, etched drinking glasses, matchbooks, gallery announcements—all of which cleverly describe (...) how art comes to accrue value as it moves through various systems of exchange. Lawler's oeuvre was essential in creating an expanded field for photography, it was crucial in postmodern debates over theories of representation, it remains indelible within the field of institutional critique, and it has always been trenchant and witty in its sustained commitment to a feminist vision of art, art history, and contemporary art practice. But Lawler is also an old-fashioned "artist's artist," long overdue for the kind of serious reconsideration and recognition that this volume affords. The very self-effacing nature of Lawler's practice, however, her continual suspicion about notions of authorship—and her sly disregard for museological conventions—have meant that she has resisted precisely the usual mid-career retrospective. Twice Untitled and Other Pictures, published in conjunction with Lawler's first major museum exhibition in the United States, organized by the Wexner Center for the Arts, eats away at the standard museum practices of chronology, linear development, and the presentation of masterpieces, opting instead to explore such dynamic themes and undercurrents in Lawler's practice as her relationship to sculpture, her long history of collaborative projects, her production of such ephemera as napkins, matchbooks, and announcement cards, and the steady political dimension of her work—which culminated most recently in works that are deeply critical of the American invasion of Iraq. With essays by art historian and political theorist Rosalyn Deutsche and curators Ann Goldstein and Helen Molesworth, Twice Untitled and Other Pictures promises to be an essential volume for anyone interested in late twentieth- and early twenty-first- century art. (shrink)

Cet article a déjà paru dans Recherche en éducation musicale, n° 28, Université Laval, Québec et est également disponible ici. Nous remercions Louise Mathieu ainsi que la revue Recherche en éducation musicale de nous avoir aimablement autorisé à le reproduire ci-dessous, tous droits étant par ailleurs réservés. Résumé : Au début du XXe siècle, Émile Jaques-Dalcroze crée la Rythmique, une éducation musicale reconnaissant le rôle fondamental du corps et du mouvement corporel dans la façon dont on perçoit et (...) (...) - Musique et Musicologie – GALERIE – Nouvel article. (shrink)

Dans les débats suscités par les écrits de Thomas Kuhn, je me suis intéressée au caractère habituellement non thématisé d'une objection levée contre sa théorie des paradigmes, ainsi qu'au caractère ambigu de la réfutation que lui apporte Kuhn. L'objection porte sur le rapprochement abusif que la théorie des paradigmes opérerait entre l'homme de science et l'homme ordinaire, comme si pour Kuhn la science relevait du bon sens. De son côté, et en dépit de la fréquence de ses références à l'homme (...) ordinaire, Kuhn déclare que cette interprétation de sa théorie n'est pas pertinente. (shrink)

Lakatos' MSRP is utilized to provide a response to Koertge's claim (in her ‘Does Social Science Really Need Metaphysics?’) that the heuristic significance of metaphysics has been vastly overrated. By outlining the hard cores and positive heuristics of the two major research programmes in economics (namely, the ‘orthodox’ and ‘Marxist’ research programmes), the paper demonstrates (in opposition to Koertge's claim) not only that the metaphysical statements in the respective hard cores are far from vague but also how these exert an (...) important regulative influence both on the theories and economic policy recommendations generated within the respective programmes. It also indicates how the adoption of the MSRP method of appraisal in economics would help to protect against the danger of entrenched metaphysical dogmatism with its implications not only for economic policy recommendations but also for moral and political recommendations. * We appreciate the assistance given by Professor N. Koertge, who provided us with translations of her articles, and the helpful comments of an anonymous referee. (shrink)

Let n be a positive integer and FAℓ be the free abelian lattice-ordered group on n generators. We prove that FAℓ and FAℓ do not satisfy the same first-order sentences in the language if m≠n. We also show that is decidable iff n{1,2}. Finally, we apply a similar analysis and get analogous results for the free finitely generated vector lattices.

« Le temps des jeunes filles » grecques est d'abord défini par son terme : le mariage auquel elles sont destinées et dans le cadre duquel, devenues épouses, elles rempliront, pour leur famille et pour la cité, leur fonction de mères. Du temps du jeu à celui du mariage il n'y a qu'un pas ; sitôt pubère, la fillette, désormais parthenos, c'est-à-dire « jeune fille », ou « vierge en attente du mariage » est offerte aux regards, dans le cadre (...) des fêtes religieuses publiques, surtout si elle est de famille « bien née ». Les jeunes filles, en tant que groupe d'âge, sont en effet partie intégrante de la communauté civique, à l'égal des garçons, avec qui elles participent aux choeurs et aux processions. A la fois précieuses, pour l'avenir qu'elles ont pour fonction d'assurer, et vulnérables, elles sont à ces deux titres investies par l'imaginaire de la cité qui construit autour d'elles des histoires qui en font des victimes souvent glorieuses, en fort contraste avec le destin d'épouses et de mères « au foyer » qui les attend dans la cité réelle. (shrink)

« Le temps des jeunes filles » grecques est d'abord défini par son terme : le mariage auquel elles sont destinées et dans le cadre duquel, devenues épouses, elles rempliront, pour leur famille et pour la cité, leur fonction de mères. Du temps du jeu à celui du mariage il n'y a qu'un pas ; sitôt pubère, la fillette, désormais parthenos, c'est-à-dire « jeune fille », ou « vierge en attente du mariage » est offerte aux regards, dans le cadre (...) des fêtes religieuses publiques, surtout si elle est de famille « bien née ». Les jeunes filles, en tant que groupe d'âge, sont en effet partie intégrante de la communauté civique, à l'égal des garçons, avec qui elles participent aux choeurs et aux processions. A la fois précieuses, pour l'avenir qu'elles ont pour fonction d'assurer, et vulnérables, elles sont à ces deux titres investies par l'imaginaire de la cité qui construit autour d'elles des histoires qui en font des victimes souvent glorieuses, en fort contraste avec le destin d'épouses et de mères « au foyer » qui les attend dans la cité réelle. (shrink)