Letteratura scientifica selezionata sul tema "Interactions océan-atmosphère-cryosphère"
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Articoli di riviste sul tema "Interactions océan-atmosphère-cryosphère":
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Garg, Kabir, e Himanshu Tyagi. "Buspirone in obsessive-compulsive disorder: a potential dark horse?" BJPsych Open 7, S1 (giugno 2021): S165. http://dx.doi.org/10.1192/bjo.2021.457.
Abstract (sommario):
AimsPharmacological management of Obsessive-Compulsive Disorder (OCD) presents a challenge in modern psychiatry. While most patients respond preferably to serotonin re-uptake inhibitors (SRI), the response is usually delayed by several weeks leading to an insufficient short term management of anxiety. It is also frequently inadequate and needs higher doses and augmentation in many instances. Investigating newer pharmacological strategies to address such treatment gaps has always been of interest. Buspirone is a novel anxiolytic medication with additional weak antidepressant and poor anti-psychotic effects. It is the only medication in its category, i.e. azapriones. It has comparable anti-anxiety efficacy to that of benzodiazepines without their sedating or habit forming effects, and has been demonstrated to moderate serotonin and other monoamine neurotransmission with a favourable safety profile.MethodWe reviewed the literature pertaining to the use of Buspirone in OCD for both as a primary anti-obsessive agent and for a potential secondary role in management of chronic anxiety and/or anxiety disorders comorbid to OCD.ResultThe results of a number of case reports and open trials have been positive while controlled trials have shown contradictory results. In a double blind RCT comparing clomipramine and buspirone, significant improvement was found in both groups with no differences between the two. Further two trials observing buspirone augmentation of clomipramine and fluoxetine treatment respectively, in a double-blind placebo controlled design reported significant improvement in the treatment as opposed to the placebo arm. Another double-blind placebo controlled study of buspirone augmentation of fluvoxamine resistant patients did not show significant benefits as an anti-obsessional agent, but notable anxiolytic effects were reported. In all the trials buspirone was largely well tolerated and did not pose any significant interactions with other psychotropic agents or dependence potential.ConclusionBuspirone is a pharmacologically unique agent with a good safety profile. Given the robust anxiolytic effects of this Peron along with complex neurotransmission modulatory effects coupled with a favourable tolerance and dependents profile might make buspirone an attractive novel pharmacological agent for augmentation in OCD . Further controlled studies to better establish effectiveness and deciphering if certain patients may respond to its use over others, are warranted
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Omana, Lourdes, Ruben Lopez Doncel, Jose Ramon Torres Hernandez, Fernando Nunez Useche e Edith Cienfuegos. "The Cenomanian-Turonian oceanic anoxic event (OAE-2) and continuous drowning up to the Santonian of the Western Valles-San Luis Potosi Platform, Central to Eastern Mexico: Biostratigraphy, chemostratigraphy and paleoenvironments". Micropaleontology 68, n. 1 (2022): 29–50. http://dx.doi.org/10.47894/mpal.68.1.02.
Abstract (sommario):
The Upper Cretaceous stratigraphic succession in the western part of the Valles-San Luis Potosi Platform (central to eastern Mexico) reflect the interaction between various paleo-oceanographic factors including sea-level change, tectonic factors, and the type and supply of sediments. The El Abra Formation is a shallow-water carbonate deposit that is overlain by the hemipelagic-pelagic Soyatal Formation, which represents the transition to a deeper, eutrophic, open marine environment in the latest Cenomanian-earliest Turonian (Whiteinella archaeocretacea Partial Range Zone). This unit is linked to a sea-level rise that occurred on a global scale and flooded the platform, coinciding with the Oceanic Anoxic Event 2 (OAE 2). This change is well–marked by faunal assemblages with a low diversity, and environmental stress–resistant species as well as values of delta 13C excursion, total organic carbon (TOC) and trace element signatures. These data suggest that in this time the ocean was oxygen deficient. During the early Turonian the platform was completely drowned, which led to re-establishment of the oligotrophic environment. These conditions favored for development of the planktonic foraminifera of the Helvetoglobotruncana helvetica Total Range Zone with the occurrence of keeled forms (k/strategists) even continuing as far as the late Santonian thus in the Soyatal interval two biostratigraphic zones are also recognized: the Dicarinella concavata Interval Zone (late Turonian-late Coniacian) and Dicarinella asymetrica Total Range Zone (early-late Santonian). This indicates that the studied part of the Valles-San Luis Potosi Platform remained flooded during this time, in contrast with Mediterranean Tethys regions where recovery of the shallow-water carbonate platforms occurred in the latest Turonian to mid-Coniacian. The planktonic foraminiferal assemblages of this interval are diverse, composed of large and complex keeled morphotypes, which indicate an open deep–sea environment.
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Romanazzi, Tiziana, Daniele Zanella, Mary Hongying Cheng, Behrgen Smith, Angela M. Carter, Aurelio Galli, Ivet Bahar e Elena Bossi. "Bile Acids Gate Dopamine Transporter Mediated Currents". Frontiers in Chemistry 9 (10 dicembre 2021). http://dx.doi.org/10.3389/fchem.2021.753990.
Abstract (sommario):
Bile acids (BAs) are molecules derived from cholesterol that are involved in dietary fat absorption. New evidence supports an additional role for BAs as regulators of brain function. Sterols such as cholesterol interact with monoamine transporters, including the dopamine (DA) transporter (DAT) which plays a key role in DA neurotransmission and reward. This study explores the interactions of the BA, obeticholic acid (OCA), with DAT and characterizes the regulation of DAT activity via both electrophysiology and molecular modeling. We expressed murine DAT (mDAT) in Xenopus laevis oocytes and confirmed its functionality. Next, we showed that OCA promotes a DAT-mediated inward current that is Na+-dependent and not regulated by intracellular calcium. The current induced by OCA was transient in nature, returning to baseline in the continued presence of the BA. OCA also transiently blocked the DAT-mediated Li+-leak current, a feature that parallels DA action and indicates direct binding to the transporter in the absence of Na+. Interestingly, OCA did not alter DA affinity nor the ability of DA to promote a DAT-mediated inward current, suggesting that the interaction of OCA with the transporter is non-competitive, regarding DA. Docking simulations performed for investigating the molecular mechanism of OCA action on DAT activity revealed two potential binding sites. First, in the absence of DA, OCA binds DAT through interactions with D421, a residue normally involved in coordinating the binding of the Na+ ion to the Na2 binding site (Borre et al., J. Biol. Chem., 2014, 289, 25764–25773; Cheng and Bahar, Structure, 2015, 23, 2171–2181). Furthermore, we uncover a separate binding site for OCA on DAT, of equal potential functional impact, that is coordinated by the DAT residues R445 and D436. Binding to that site may stabilize the inward-facing (IF) open state by preventing the re-formation of the IF-gating salt bridges, R60-D436 and R445-E428, that are required for DA transport. This study suggests that BAs may represent novel pharmacological tools to regulate DAT function, and possibly, associated behaviors.
Libri sul tema "Interactions océan-atmosphère-cryosphère":
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Kirk, Robert G. W., e Michael Worboys. Medicine and Species: One Medicine, One History? A cura di Mark Jackson. Oxford University Press, 2012. http://dx.doi.org/10.1093/oxfordhb/9780199546497.013.0031.
Abstract (sommario):
This article surveys the present position of the animal within the history of human medicine, linking this to work in the history of veterinary medicine, and also speculates on the value of making ‘species’ a central and unifying theme of a new history of medicine. It mentions that re-conceiving medicine as a set of knowledge-practices grounded in interspecies interactions promises to reinvigorate the subject. It draws on a diverse theoretical literature ranging from ‘animal studies’ to ‘post-human’ literature in order to suggest how such an approach could allow us to re-imagine what medicine has been and still may be. This is a timely project as the medical and veterinary professions, after long debating the notion of ‘one medicine’ as ‘a common pool of knowledge in microbiology, immunology, physiology, pathology and epidemiology’, are now calling to develop the field.
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Hickmott, Sarah. Music, Philosophy and Gender in Nancy, Lacoue-Labarthe, Badiou. Edinburgh University Press, 2020. http://dx.doi.org/10.3366/edinburgh/9781474458313.001.0001.
Abstract (sommario):
This book looks at the way music is used, characterised and understood in the work of Nancy, Labarthe and Badiou. Despite the differences in their philosophical-theoretical positions, they all invoke music – both directly and indirectly – to negotiate their relationship to ontology, politics, ethics and aesthetics. The book situates these texts in a longer genealogy of musico-philosophical interactions and also brings them into dialogue with recent musicological approaches, thus showing how an inherited idea of what music ‘is’ is often assumed rather than critically re-evaluated. It argues that though music is instrumentalized by progressive thinkers as a way of shifting theoretical/philosophical paradigms, it nonetheless does so in a way that has a strong sense of continuity with previous thinking on music. Secondly, the book highlights the way in which music in its metaphysical-ontological guise is often conceived as synonymous with Western high art classical music (which is itself constructed as absolute and transcendent, and ontologically independent of its means of (re)production or context) whilst non-literate, popular, folk and world musics – on the occasions that they are addressed and not simply ignored or denigrated – are notably considered almost exclusively in terms of their social-cultural or technological contexts. Finally, the book demonstrates that much of this takes place through a simultaneous instrumentalization of gender as an organisational category for philosophy, and one which all too often has the consequence of sending women – along with music – to the beyond of pre-, inter-, or post-signification.
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NANDE-VÁZQUEZ, Edgard Alfredo, Teodoro REYES-FONG e Omar Alejandro PÉREZ-CRUZ. The Generalized Least Squares Method (GMM) as a tool for causal analysis of spending, budget management and electoral results. ECORFAN, 2021. http://dx.doi.org/10.35429/b.2021.8.1.130.
Abstract (sommario):
In the different fields of science, many times, there is a need to estimate the associations between variables, as an approach to understanding the interaction of one as a function of the others. It is usually done by applying restrictive models, such as analysis of variance and linear regression. This type of analysis requires that the dependent variable be continuous, have a normal and constant distribution of the mean and variance. However, when the dependent variable is discrete or categorical, the linear model is not viable. Faced with this impediment, the theory of linear models arises and is expanded to broader categories, which have been called Generalized Linear Models. This category assumes that all distribution functions are exponential, in which the normal distribution is located. In this sense, in this research, Generalized Least Squares methods were applied in their various variants: of moments, ordinary and feasible. These models allow calculating the parameters of models in which the dependent variable has a Poisson or multinomial distribution. In such a way that the Generalized Least Squares serve as a tool to analyze the effect of the elections on public spending and its relationship with the electoral results, analyzing the variables of a budgetary nature, derived from the possibility that the government in power continues or is re-elected. For this, data related to the states and municipalities of México in the period 2007 to 2019 are used.
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Isaac, Allan Punzalan. Filipino Time. Fordham University Press, 2021. http://dx.doi.org/10.5422/fordham/9780823298525.001.0001.
Abstract (sommario):
Filipino Time examines how a variety of immaterial labor performed by Filipinos in the Philippines and around the world, while producing bodily and affective disciplines and dislocations, also generate and explore vital affects, multiple networks, and other worlds. Whether in representations of death in a musical or keeping work time at bay in a call center, these forms of living emerge from and even work alongside capitalist exploitation of affective labor. Affective labor involves human intersubjective interaction and creative capacities. Thus, through creative labor, subjects make communal worlds out of one colonized by capital time. In reading these cultural productions, the book traces concurrent chronicities, ways of sensing and making sense of time alongside capital’s dominant narrative. From the hostile but habitable textures of labor-time, migratory subjects live and weave narratives of place and belonging, produce new modes of connections and ways to feel time with others.The book explores how these chronicities are re-articulated in a capacious archive of storytelling about the Filipino labor diaspora in fiction, in a musical, in an ethnography, and in a documentary film. Each of the genres demonstrates how time and space are manifest in deformations by narrative and genre. These cultural expressions capture life-making capacities within the capitalist world of disruptions and circulations of bodies and time. Thus, they index how selves go out of bounds beyond the economic contract to transform, even momentarily, self, others, time, and their surroundings.
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Esteban-Salvador, Maria Luisa, a cura di. The International Conference on Multidisciplinary Per- pectives on Equality and Diversity in Sports (ICMPEDS). 14th to the 16th of july 2021 . Book of abstracts. Universidad de Zaragoza, 2021. http://dx.doi.org/10.26754/uz.978-84-18321-32-0.
Abstract (sommario):
The International Conference on Multidisciplinary Perspectives on Equality and Diversity in Sports (ICMPEDS) is organized by GESPORT with the support of the Erasmus+ Programme of the European Union from the 14th to the 16th of July 2021. The conference is an excellent forum for academics, researchers, practitioners, athletes, man- agers and professionals of federations, associations and sport organizations, and those other- wise involved in sport to share and exchange ideas in different areas of sport related equality worldwide. We will keep you informed by email and post the latest information on this matter on the GESPORT website and social media. Sport and its management continues to be a field where men and masculinity strongly prevail. This conference aims to investigate the complexities attached to the following questions: What does gender openness mean in the context of sport in the 21st century? What persists as gen- der closure in the same context? What are the gender cultures that signify sport continuing to be defined by regimes that resort to a dominant masculinity embodied in a strong and athletic male body? Moreover, and albeit some exceptions, athletes, practitioners, decision and policy makers, and sports spectators are predominantly men. In this sense, gender discrimination and segregation are present in multiple aspects of sport. Some illustrations include: a) male athletes have high salaries, more career opportunities, and get more recognition by society than female athletes; b) management and leadership positions in sports organizations are mainly occupied by men, including in sports traditionally considered as feminine and which have become feminised (e.g. gymnastics and dance); c) masculinised sports and its male athletes have much more attention and recognition from the media than female athletes; d) sports journalism continues to be predominantly produced and managed by men; e) some sports spectatorships cultures are marked by rituals and interactions that resort to masculine tribalism, often leading to aggressive and violent behaviours. Gender discrimination in sport is somehow socially normalised and accepted through a dis- course that essentialises the embodied sexual differences between genders. This gender dis- course legitimises the exclusion of women in some sports modalities and traps female bodies in sociocultural constructions as less able to exercise and engage in sport, or as the second and weaker version of the ideal masculine body. However, there are signs that the context of sport may be changing. The European Union and some national governments have made an effort to promote gender equality and diversity by fostering the adoption of gender equality codes/policies in different modalities and in in- ternational and local sports organizations. These new policies aim to increase female partic- ipation and recognition in sport, their access to leadership positions and involvement in the decision-making in sport structures. Additionally, the number of women practising non-com- petitive sport and as sports spectators have started growing, leading to new representations of sport and challenging the role of women in such a context. Finally, different body constructions and the emergence of alternative embodied femininities and masculinities are also challeng- ing how athletes of both genders experience their bodies and sports practice. Yet, research is scarce about the impact of these changes/challenges in the sports context. This conference will focus on mapping gender relations in sport and its management by taking into account the different modalities, contexts, institutional policies, organizational structures and actors (e.g. athletes, spectators, media professionals, sport decision makers and man- agers). It will treat sport and its management as one avenue where gender segregation and inequality occurs, but also adopt such as a space that presents an opportunity for change and does so as a widely applicable topic whose traits and culture are reflected in organizations and work more broadly. In this sense, the conference is interested in theoretical and empirical research work that may explore, but are not limited to the following issues: • Women representativeness in sports modalities and in sport organizational structures in different countries; • Women and management accounting in sport organizations; • The gender regimes that (re)produce different sports policies, modalities, and institu- tions in sport; • The stories of resistance/conformity of women that already occupy different roles in sport contexts; • The challenges and impact of conventional and new body representations in sports institutions and including athletes of both genders; • The discourses of masculinities in sport and its effect on women and men athletes; • The emergence of nationalism and populist discourses in political and governments states and their impact on the (re)shaping of masculinity and femininity constructions in sport; • The gendered transformations of the spectators’ gaze in what concerns different sports modalities; • The effects of new groups of sports spectators on gender relations in sport; • The discourses in media and its participation in the sports gender (in)equality; • The impact of new technologies, and new practices of training/coaching in the body- work and identities of athletes of both genders.
Capitoli di libri sul tema "Interactions océan-atmosphère-cryosphère":
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Jakonen, Teppo, e Heidi Jauni. "Telepresent Agency: Remote Participation in Hybrid Language Classrooms via a Telepresence Robot". In New Materialist Explorations into Language Education, 21–38. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-13847-8_2.
Abstract (sommario):
AbstractVideoconferencing technologies have become increasingly common in different sectors of life as a means to enable real-time interaction between people who are located in different places. In this chapter, we explore interactional data from synchronous hybrid university-level foreign language classrooms in which one student participates via a telepresence robot, a remote-controlled videoconferencing tool. In contrast to many other forms of video-mediated interaction, the user of a telepresence robot can move the robot and thereby (re-)orient to the space, the other participants and material objects that might be outside his immediate video screen. We employ an ethnomethodological and conversation analytic (EMCA) perspective to explore Barad’s (Quantum physics and the entanglement of matter and meaning. Durham: Duke University Press: 2007) notion of agency as a distributed phenomenon that emerges from assemblages of humans and materials. We demonstrate the complex nature of telepresent agency by investigating where agential cuts lie in three short episodes that involve mediated perception, touch and movement. Based on the analyses, we discuss how the telepresence technology configures learning environments by making new kinds of competences and forms of adaptation relevant for teachers and students.
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Aburasain, R. Y., E. A. Edirisinghe e M. Y. Zamim. "A Coarse-to-Fine Multi-class Object Detection in Drone Images Using Convolutional Neural Networks". In Digital Interaction and Machine Intelligence, 12–33. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11432-8_2.
Abstract (sommario):
AbstractMulti-class object detection has a rapid evolution in the last few years with the rise of deep Convolutional Neural Networks (CNNs) learning based, in particular. However, the success approaches are based on high resolution ground level images and extremely large volume of data as in COCO and VOC datasets. On the other hand, the availability of the drones has been increased in the last few years and hence several new applications have been established. One of such is understanding drone footage by analysing, detecting, recognizing different objects in the covered area. In this study conducted, a collection of large images captured by a drone flying at a fixed altitude in a desert area located within the United Arab Emirates (UAE) is given and it is utilised for training and evaluating the CNN networks to be investigated. Three state-of-the-art CNN architectures, namely SSD-500 with VGGNet-16 meta-architecture, SSD-500 with ResNet meta-architecture and YOLO-V3 with Darknet-53 are optimally configured, re-trained, tested and evaluated for the detection of three different classes of objects in the captured footage, namely, palm trees, group-of-animals/cattle and animal sheds in farms. Our preliminary experiments revealed that YOLO-V3 outperformed SSD-500 with VGGNet-16 by a large margin and has a considerable improvement as compared to using SSD-500 with ResNet. Therefore, it has been selected for further investigation, aiming to propose an efficient coarse-to-fine object detection model for multi-class object detection in drone images. To this end, the impact of changing the activation function of the hidden units and the pooling type in the pooling layer has been investigated in detail. In addition, the impact of tuning the learning rate and the selection of the most effective optimization method for general hyper-parameters tuning is also investigated. The result demonstrated that the multi-class object detector developed has precision of 0.99, a recall of 0.94 and an F-score of 0.96, proving the efficiency of the multi-class object detection network developed.
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Yi, Guyi, e Ilaria Di Carlo. "Cyborgian Approach of Eco-interaction Design Based on Machine Intelligence and Embodied Experience". In Proceedings of the 2020 DigitalFUTURES, 79–90. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4400-6_8.
Abstract (sommario):
AbstractThe proliferation of digital technology has swelled the amount of time people spent in cyberspace and weakened our sensibility of the physical world. Human beings in this digital era are already cyborgs as the smart devices have become an integral part of our life. Imagining a future where human totally give up mobile phones and embrace nature is neither realistic nor reasonable. What we should aim to explore is the opportunities and capabilities of digital technology in terms of fighting against its own negative effect - cyber addiction, and working as a catalyst that re-embeds human into outdoor world.Cyborgian systems behave through embedded intelligence in the environment and discrete wearable devices for human. In this way, cyborgian approach enables designers to take advantages of digital technologies to achieve two objectives: one is to improve the quality of environment by enhancing our understanding of non-human creatures; the other is to encourage a proper level of human participation without disturbing eco-balance.Finally, this paper proposed a cyborgian eco-interaction design model which combines top-down and bottom-up logics and is organized by the Internet of Things, so as to provide a possible solution to the concern that technologies are isolating human and nature.
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Lucertini, Giulia, e Francesco Musco. "Circular City: Urban and Territorial Perspectives". In Regenerative Territories, 123–34. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-78536-9_7.
Abstract (sommario):
AbstractThe United Nation’s 17 Sustainable development Goals (SDG) can be considered as the lighthouse of the great challenges which humanity will be confronted with. Many of these goals are related to our behaviors and our “take, make, and dispose,” namely, the linear dominant economic model that, in the last centuries, is leading to an ongoing increase of resource consumption and, consequently, a huge generation of waste. In fact, the rate of both natural resource consumption and waste generation are urgent issues, especially in the urban and peri-urban areas that will require proper solutions. The city is and will be even more in the future the most affected and the major drivers of resource consumption since it is expected that by 2050 more than 70% of the population will live in urbanized areas, and cities will grow in number and size. It means that land, water, food, energy, and other natural resource are increasingly necessary, but because resources are limited, it is required to change the linear consumption model in a new circular model of use and consumption where waste is avoided. In the last few years, emerged that waste management practices are improving according to the European Waste Hierarchy guidance, but there is still a wide possibility of improvement. This chapter explores, on one hand, what means the circular city, and on the other hand how to build it suggesting some policy recommendations. Considering urban and peri-urban areas as the space of material and people flows, thus optimizing the space used by flows and improving their interactions, it will be possible to construct another step toward circularity. In that view, the circular city acquires an urban and territorial perspective that can be managed with the urban and territorial tools, measures, policies, and plans, able to link also issues like climate adaptation, resilience, and sustainability. Finally, we argue that important work must be done in the immediate future in order to re-think and re-design urban spaces, urban practices, and infrastructures, thus shift from linear to circular city.
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Goodpaster, Kenneth E. "Business Ethics Education and the Socratic Insight". In Times of Insight: Conscience, Corporations, and the Common Good, 49–59. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09712-6_5.
Abstract (sommario):
AbstractThis chapter shifts from “an adequate normative account of applied ethics” to the moral formation of the next generation of business leaders. In other words, this chapter concentrates on the critical role played by pedagogy in the field of business ethics. I begin by sharing my experience as a professional philosopher being mentored into a radically new kind of teaching: the case method. One of the principal motivations behind the use of this method is described in an eloquent article entitled: because wisdom can’t be told. I learned that the art of questioning was central to the case method, especially to teaching ethics by the case method. Re-enter Socrates, who was the master of the art of questioning. And enter too a fourth insight in my business ethics career. I call it the Socratic insight because it springs from the instructor’s realization of his or her calling to participate in the moral formation of those with whom he or she is in dialogue. It is the manifestation in the classroom of Royce’s moral insight: the realization of the other (student, employee, executive) as one whose moral awareness can be elicited through respectful dialogue. I complete this chapter by providing a guide to the viewpoints through which case method questions may be shaped: the “four avenues” for ethical analysis: interests, rights, duties, and virtues. Finally, I compare the pedagogy of business schools with that of executive education, noting that executive interactions based on the case method are principally designed to elicit from the participants’ experience the threats to personal and organizational conscience. This chapter is an organic part of a larger work about the overall contribution of Kenneth Goodpaster to the field of applied ethics and is best read in the context of that larger work.
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Manera, Lorenzo. "Digital Objects’ Aesthetic Features. Virtuality and Fluid Materiality in the Aesthetic Education". In Springer Series in Design and Innovation, 147–55. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-49811-4_14.
Abstract (sommario):
AbstractThe growing and ubiquitous presence of digital objects raises issues of interest from the points of view of both Aesthetics and interaction design. In fact, such issues concern the perceptual dimension that defines our relationship with digital objects, the reconfiguration of the sensitive experience that their development implies, their hybrid ontological status, and their possible role in developing innovative forms of aesthetic education combined with design thinking.In the contemporary debate, digital objects are intended – on the one hand – as designed objects that incorporate and employ digital technologies [1–3].On the other hand, they are interpreted as virtual bodies, interactive digital images that become a phenomenon of the binary representation of an algorithm which interacts with a user [4]. Within the former perspectives, digital objects display a quality that broadly belongs to technical devices, meaning their openness to forms of interactivity, and their sensitivity to contingency. In the latter, the features of intermediacy and virtuality are considered the defining characteristics of digital objects. The growing complexity of digital objects is, in fact, re-defining the relationship between materiality and distance, provenance and pertinence, suggesting an interactive conception of agency that allows forms of aesthetic experience in which imagination, sensibility and intuitions can be displayed within relational structures. By showing the results of a research project focused on digital materials and their transformation, which involved children aged 8 to 11 years old, this contribution aims to discuss the possible role that such objects can play in developing new forms of aesthetic education.
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Kimmel, Anna Jayne. "Of the spaces between: prepositional events throughout the Festival de Marseille". In Embodying Peripheries, 216–37. Florence: Firenze University Press, 2022. http://dx.doi.org/10.36253/978-88-5518-661-2.10.
Abstract (sommario):
This chapter considers the Festival de Marseille-danse et arts multiple 2017 as a successful apparatus of transition from positions of non-place to place in one of Europe’s most diverse cities. Through its temporary installation, the festival crossed spatial, aesthetic, and thematic divisions of the center and periphery, constructing bridges of movement between these invisible borders. In doing so, this chapter troubles the traditional affirmation that the value of performance is most prominently interpreted during its enactment. Instead, it leverages the spatial turn of French theory to emphasize that the festival's significance extends to the process of coming-to-stage, and highlights participant interactions with the city as facilitated by the festival’s infrastructure. In re-framing the boundaries of the festival’s intended performance scene from the aestheticized proscenium to the larger social context of Marseille, a voyeuristic and objectifying gaze is removed from the staged bodies and redirected to a new embodied praxis of inclusion and exclusion, rehearsed for, and by, the performer whose ephemeral offering is too often pushed to the periphery or essentialized at the center but never allowed full placement. To move away from accentuating the fixed nouns and verbs of place in a recapitulation of the actors and how they danced, this chapter instead looks toward the mechanisms that scaffolded the relationship between the two—the grammar of the event—which both exceeded and preceded its actual content. What emerges is an attention toward prepositional events, the mechanics of societies that facilitate and articulate such relations.
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Mik-Meyer, Nanna. "Powerful encounters as seen from an interactionist perspective". In The Power of Citizens and Professionals in Welfare Encounters. Manchester University Press, 2017. http://dx.doi.org/10.7228/manchester/9781526110282.003.0004.
Abstract (sommario):
This chapter present the tradition of symbolic interactionism, that is, the interactionist approach to studying the in-between in human encounters and the study of how interacting individuals interpret the particular situation in which they are part and how this structures their interactions (as put forth by Goffman especially). The chapter furthermore discuss selected empirical studies of the encounter between welfare workers and citizens with particular attention to their respective roles and their relationship with one another. In addition, the chapter emphasises the soft power at play between citizens and welfare workers and exemplify how the structural elements and agency of the two parties frame the encounter. Thus, both welfare workers and citizens co-produce dominant norms in welfare work and this (re)production is an expression of soft power.
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Banerjee, Arundhati, e Sujay Ray. "An Optimized In Silico Neuroinformatics Approach". In Handbook of Research on Natural Computing for Optimization Problems, 802–20. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-5225-0058-2.ch032.
Abstract (sommario):
A computationally optimized molecular analysis into the cell-fate regulations from embryonic development is one of the unexplored zones in human neurogenic field. It is governed by SOX11 (Sex determining regions-Y bOX-11) protein domain's interaction with DNA. In the present study, 3D monomer of the responsible domain of SOX11 was constructed, simulated and analyzed. Residues indulged with DNA interaction were examined. The observed conserved residue, Arg3 and Arg16 in the wild-type SOX11-DNA interaction were mutated with Ala3 and Ala16. Mutated SOX11-HMG protein sequence was re-modeled and optimized. Residue-level alteration on DNA interaction was examined. On mutation, stability of the proteins (on DNA interaction) and protein-DNA complexes were discerned via energy-calculating parameters, solvent-accessibility area, electrostatic surface-potential and conformational switching, with supportive statistical significance. Therefore, this probe provides an outlook to discern SOX11 to interact firmly with DNA via mutations and thereby perform cell-fate determinations more efficiently.
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Inose, Hiroko. "Re-Imported Literature or Double Domestication: Shizuko’s Daughter by Kyoko Mori". In Narratives Crossing Borders: The Dynamics of Cultural Interaction, 255–74. Stockholm University Press, 2021. http://dx.doi.org/10.16993/bbj.l.
Abstract (sommario):
A text can travel between languages and cultures through translation, but this “travel” can be rather complicated when the text not only goes, but goes back to the culture of origin. This can happen when the text is about the culture of the target language. Translating Memoir of Geisha by Arthur Golden (1997) into Japanese can be one example. Due to the expected level of readers’ cultural knowledge, the translator will have to use some different translation strategies compared to when the text is translated into other languages. This “travel” of the text can be even more complicated if the author’s first language or original cultural background is different from the language in which s/he writes the text – for example, an author whose first language is Japanese, but writing his/her text in English, about stories that take place in Japan – and then the text is translated into Japanese by a translator, to be published in Japan. This is the case of Kyoko Mori, a Japanese-American writer who had grown up in Japan until she moved to U.S. as an adult. Her first novel, Shizuko’s Daughter was published in U.S. in 1993. It is autobiographical, and therefore the story takes place in Japan, with all its personages being Japanese. The novel was translated by Makiko Ikeda and published in Japan in 1995. Four of Mori’s novels are published in Japan, but the author never translated her own novels into Japanese. This happened before the cross-border literature boom in Japan and may be considered as its precursor. In the present study, the “travel” of this text will be studied from two aspects – exoticisation and translation. The novel belongs to the minority literature in U.S., and its Japanese aspects seem to be emphasized in its reading (in its cover or in book reviews), whereas in Japan, its publication was called “Reimported Japanese literature”, and the fact it was written in English attracted great attention. It was an exoticisation from both ends. As for the translation, source and target texts will be studied in detail, to identify the cases of change, addition (of extra information), omission, correction of culturally wrong information (if any) and their motives will be considered. Unnatural expressions and translationese will also be studied, considering if they can be avoided when the first language of the author is Japanese.
Atti di convegni sul tema "Interactions océan-atmosphère-cryosphère":
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Winter, Andrew O., e Michael R. Motley. "Development of a Fluid-Structure Interaction Model of an Oscillating Wave Surge Converter Using OpenFOAM". In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-19145.
Abstract (sommario):
Abstract Wave energy converters (WEC), particularly those of the oscillating paddle type, are one of the least utilized categories of marine energy harvesting devices. As such, the goal of this research is to develop improved WEC technology through numerical modeling that will inform future experimental testing, which is being carried out by the Pacific Marine Energy Center. A novel scheme using mesh distortion and re-meshing to simulate the rotation of a wave-driven oscillating wave surge converter is presented herein using only the default functionality of the OpenFOAM computational fluid dynamics software package as a framework to implement the scheme as a convenient tool for engineers to study OWSC performance. This scheme relies on the use of finite volume mesh quality parameters, namely mesh cell non-orthogonality and skewness, to control when re-meshing operations are undertaken, minimizing the number of re-meshing operations needed to accommodate OWSC motions while maintaining solution stability and accuracy.
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Ludorf, Rainer K., Robin L. Elder, Turid H. Tronbøl e Jan Øverli. "Stage Re-Matching as a Result of Droplet Evaporation in a Compressor". In ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/95-gt-194.
Abstract (sommario):
An existing one dimensional stagewise compressor stability analysis programme has been extended to incorporate a model for humidity and droplet evaporation. In its modified form the model shows the extent of stage re-matching when ingesting modest amounts of water. The water distribution throughout the flow is assumed to be homogeneous. The stage interactions of an aircraft engine compressor are investigated for different environmental operating conditions. The effects of humidity on stage loading are small while the evaporation of water causes a significant shift of the operating point along the characteristics.
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Jung, Eui Yeop, Chan Ung Park, Dong Hyun Lee, Kyung Min Kim, Ta-kwan Woo e Hyung Hee Cho. "Heat Transfer Characteristics of an Angled Array Impinging Jet on a Concave Duct". In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69566.
Abstract (sommario):
This study investigated the heat transfer characteristics of an array jet cooling system on a concave surface. Two types of injection holes were used: one for impinging jets normal to the impingement surface, and the other for angled impinging jets. For the normal jets, the jet Reynolds number (Re) based on the hole diameter varied from 3,000 to 10,000, and the height-to-diameter ratio (H/d) was fixed at 1.0. There were 15 injection holes positioned in a staggered 3×5 array. For the angled jets, Re was set to 5,000 and H/d was also fixed at 1.0. Naphthalene sublimation method was used to determine the heat transfer coefficients on the targeted plates. For normal impinging jet cooling, separate peaks were observed at the stagnation regions due to the curvature effect. Since a crossflow was generated by air spent from the jet arrays, the crossflow effect increased as it moved downstream. Due to the interaction between the crossflow and impinging jets, the peak values at the stagnation points increased downstream. The heat transfer coefficient on the targeted plate increased with Re. The average Sh of the angled jets was higher than that of the normal jets, as the obliquely impinging jet increased the mass flow rate and mass interaction between the jet impingement points.
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Delhez, Elise, Florence Nyssen, Jean-Claude Golinval e Alain Batailly. "Assessment of Geometric Nonlinearities Influence on NASA Rotor 37 Response to Blade Tip/Casing Rubbing Events". In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-58931.
Abstract (sommario):
Abstract This paper uses a recently derived reduction procedure to study the contact interactions of an industrial blade undergoing large displacements. The reduction technique consists in projecting the dynamical problem onto a reduction basis composed of Craig-Bampton modes and a selection of their modal derivatives. The internal nonlinear forces due to large displacements are evaluated with the stiffness evaluation procedure and contact is numerically handled using Lagrange multipliers. The numerical strategy is applied on an open industrial compressor blade model based on the NASA rotor 37 blade in order to promote re-producibility of results. Two contact scenarios are investigated: one with direct contact between the blade and the casing and one with an abradable material deposited on the casing. The influence of geometric nonlinearities is assessed in both cases. In particular, contact interaction maps and abradable coating wear pattern maps are used to identify the main interactions that can be detrimental for the engine integrity.
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Narayanan, Chidambaram, e Djamel Lakehal. "Four-Way Coupling of Dense Particle Beds of Black Powder in Turbulent Pipe Flows". In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30137.
Abstract (sommario):
The modeling of particle deposition and transport in pipes is one of the most challenging problems in multiphase flow, because the underlying physics is multi-faceted and complex, including turbulence of the carrier phase, particle-turbulence interaction, particle-wall interactions, particle-particle interactions, two-way and four-way couplings, particle agglomeration, deposition and re-suspension. We will discuss these issues and present new routes for the modeling of particle collision stress. Practical examples like black powder deposition and transport in gas pipelines will be presented and discussed. The model employed is based on dense-particle formulation accounting for particle-turbulence interaction, particle-wall interactions, particle-particle interactions via a collision stress. The model solves the governing equations of the fluid phase using a continuum model and those of the particle phase using a Lagrangian model. Inter-particle interactions for dense particle flows with high volume fractions (from 1% to close packing ∼60%) have been accounted for by mapping particle properties to an Eulerian grid and then mapping back computed stress tensors to particle positions. Turbulence within the continuum gas field was simulated using the V-LES (Very Large-Eddy Simulation) and full LES, which provides sufficient flow unsteadiness needed to disperse the particles and move the deposited bed.
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Zhang, Li, Qiyang Shangguan, Lin Ding, Yanrong Chen e Qianyun Ye. "Flow-Induced Motion of an Elastically Mounted Circular Cylinder With Roughness Strips at Different Angles of Attack". In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54815.
Abstract (sommario):
Flow-induced motions (FIM) of an elastically mounted circular cylinder with roughness strips at different angles of attack are investigated by 2-D URANS simulations based on the open source CFD tool OpenFOAM. The cylinder is constrained to one degree of freedom motion in the transverse direction. Two selectively distributed roughness strips on cylinder surface are used to enhance the FIM of the cylinder. Simulations are conducted at Re = 60,000 and Re = 100,000 with the angle of attack, αattack, varies from 0° to 90°. Amplitude response, frequency response, and near-wake structures of the cylinder are discussed in numerical results. The simulation results indicate that both suppression and enhancement of FIM are observed for the cylinder as the angle of attack rises from 0° to 90°. For αattack≥ 55°, the near-wake region becomes quite slender and vortex shedding is suppressed. The FIM of the cylinder is greatly inhibited when αattack ≥55°. In addition, a complex vortex reattachment observed in the near-wake region intensifies the fluid-structure interactions and causes obviously higher amplitude.
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Abubeker, Samrawit, e Celestin Nkundineza. "Wear Depth Analysis for Rail-Car Wheels: Case of Addis Ababa Light Rail Transit Service". In 2022 Joint Rail Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/jrc2022-78160.
Abstract (sommario):
Abstract Railway transportation is a superior mean of all modes of transport. Specifically, it has gained a crucial role in limiting traffic congestion in heavily crowded regions and in reducing polluting carbon emissions. In this perspective, rolling contact fatigue of railway components is the most crucial subject because it has an important role in determining the operational reliability of the wheel/rail system. Because of wheel wear, wheel re-profiling is usually required for proper wheel-rail interaction. However, wheel re-profiling reduces the wheel radius and increase flange thickness. Therefore, the strain energy density in the wheel tread is expected to increase while the strain energy on the flange is expected to decrease in the re-profiled wheel. This effect would either increase or decrease the life of the wheel depending on reprofiling frequency is done. On the other hand, the maintenance costs are expected to increase as the re-profiling frequency increases. For quality service and improvement of the service life of the railway wheels, with reduction of the maintenance cost, a problem-solving research idea is formulated through comparing the expected wear depth and the current operational wear depth. Therefore, this study is focused on the influence of reprofiling on the wear depth of a railway wheel. The adopted method in this study is based on analyzing reprofiling data of worn-out non- re-profiled and re-profiled railway wheel. A case study is taken at Addis Ababa Light Rail Transit Service (AALRTS). The wheel profiles are generated through measurement before and after profiling at AALRTS. In a single pair of models of a worn-out wheel and a reprofiled one, the results show that the re-profiling process affects the wear depth. It increases by 18 mm after 75028 km while the expected wear depth is 1.43 mm for the same mileage.
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Bernard, Ronan, Patrick Foltyn, Anne Geppert, Grazia Lamanna e Bernhard Weigand. "Generalized analysis of the deposition/splashing limit for one- and two-component droplet impacts upon thin films". In ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems. Valencia: Universitat Politècnica València, 2017. http://dx.doi.org/10.4995/ilass2017.2017.4810.
Abstract (sommario):
Single drop impacts on thin liquid layers are of particular interest because of the ejection of secondary droplets, theso-called splashing. Only a few studies handle the deposition/splashing limit for two-component interaction, where the liquid properties of the impacting drop and wall film differ significantly.This study aims at identifying a unified approach for one- and two-component interactions to determine the deposi- tion/splashing limit. Therefore, a large database of both interactions is considered, which includes data from litera- ture for one-component interactions plus the following binary combinations: hyspin-hexadecane, diesel-hexadecane and diesel-motor oil. Furthermore, a systematic study of two-component interactions with several silicon oils and hexadecane is performed. To map the outcomes, the Ohnesorge number Oh and the Reynolds number Re calcu- lated with arithmetically averaged fluid properties between droplet and wall film fluid are chosen. The dimensions- less film thickness δ is added to form a 3D plot, where one- and two-component experiments are combined.Existing correlations from the literature are revised regarding both interactions and their consistency is checked. The investigated range of high viscosity fluids allow us to propose an improvement of the correlation for high Oh. Our results show that the arithmetically averaged fluid properties lead to a good repartition of both one- and two- components interactions toward the deposition/splashing limit. They also corroborate the previous findings that an increase of δ inhibits splashing but its influence is decreasing with increasing Oh.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4810
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Nakamura, Kotaro, Masashi Tanabe, Satoru Abe, Takashi Mawatari e Takao Nakagaki. "Modeling of Low-Temperature Reduction of Metal Oxide in Hydrogen Treatment System for Severe Accidents in Nuclear Power Plants". In 2020 International Conference on Nuclear Engineering collocated with the ASME 2020 Power Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icone2020-16450.
Abstract (sommario):
Abstract At the Fukushima Daiichi nuclear power plant, zirconium in the fuel rod cladding reacted with water vapor at elevated temperatures due to a loss of cooling water, resulting in the production of a large amount of hydrogen. This hydrogen leaked from the reactor vessel and accumulated in the top of reactor building, eventually leading to an explosion. A hydrogen treatment system that re-oxidizes hydrogen to water vapor is one of the effective methods to prevent such an explosion. A prominent re-oxidation method is via a fixed bed reactor packed with metal oxide pellets. The advantages of this method are its relatively fast oxidation rate without external oxygen/air injection. In this study, experiments and complementary numerical calculations were performed on the hydrogen re-oxidation reaction by metal oxides. The oxidation of hydrogen by copper oxide is modeled by 5 interacting, elementary reactions consisting of 6 chemical species. Experiments were performed using two packed bed set-ups, with measurement of inlet/outlet gas composition and pre/post-analysis of solid composition used to determine constants of the individual reaction rates for numerical calculations. From these reaction constants, the temporal behavior of the outlet gas was predicted.
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Aotsuka, Mizuho, e Takeshi Murooka. "Numerical Analysis of Fan Transonic Stall Flutter". In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26703.
Abstract (sommario):
This paper describes numerical investigation of fan transonic stall flutter, especially focused on flutter bite. A transonic stall flutter occurs in high loaded condition at part rotating speed. A region of the transonic stall flutter occasionally protrudes to an operating line at narrow rotational speed range. This protrusion of flutter boundary is called flutter bite. In that case, it is necessary to re-design the blade for securing sufficient operating range. The re-design process might require some compromise on performance and/or weight, and takes long time. So it is important to understand the mechanism of the flutter bite. Two types of fan blade, one has a flutter bite and another dose not, are numerically studied with a 3D Navier Stokes CFD code. Numerical results show agreement with rig test results for the fans in qualitative sense. Detailed flow fields reveal that a detached shock wave and separation due to the shock boundary layer interaction play significant role for the flutter stability.
Rapporti di organizzazioni sul tema "Interactions océan-atmosphère-cryosphère":
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Pavlovic, Noel, Barbara Plampin, Gayle Tonkovich e David Hamilla. Special flora and vegetation of Indiana Dunes National Park. National Park Service, 2024. http://dx.doi.org/10.36967/2302417.
Abstract (sommario):
The Indiana Dunes (comprised of 15 geographic units (see Figure 1) which include Indiana Dunes National Park, Dunes State Park, and adjacent Shirley Heinze Land Trust properties) are remarkable in the Midwest and Great Lakes region for the vascular plant diversity, with an astounding 1,212 native plant species in an area of approximately 16,000 acres! This high plant diversity is the result of the interactions among postglacial migrations, the variety of soil substrates, moisture conditions, topography, successional gradients, ?re regimes, proximity to Lake Michigan, and light levels. This richness is all the more signi?cant given the past human alterations of the landscape resulting from logging; conversion to agriculture; construction of transportation corridors, industrial sites, and residential communities; ?re suppression; land abandonment; and exotic species invasions. Despite these impacts, multiple natural areas supporting native vegetation persist. Thus, each of the 15 units of the Indiana Dunes presents up to eight subunits varying in human disturbance and consequently in ?oristic richness. Of the most signi?cant units of the park in terms of number of native species, Cowles Dunes and the Dunes State Park stand out from all the other units, with 786 and 686 native species, respectively. The next highest ranked units for numbers of native species include Keiser (630), Furnessville (574), Miller Woods (551), and Hoosier Prairie (542). The unit with lowest plant richness is Heron Rookery (220), with increasing richness in progression from Calumet Prairie (320), Hobart Prairie Grove (368), to Pinhook Bog (380). Signi?cant natural areas, retaining native vegetation composition and structure, include Cowles Bog (Cowles Dunes Unit), Howes Prairie (Cowles Dunes), Dunes Nature Preserve (Dunes State Park), Dunes Prairie Nature Preserve (Dunes State Park), Pinhook Bog, Furnessville Woods (Furnessville), Miller Woods, Inland Marsh, and Mnoke Prairie (Bailly). Wilhelm (1990) recorded a total of 1,131 native plant species for the ?ora of the Indiana Dunes. This was similar to the 1,132 species recorded by the National Park Service (2014) for the Indiana Dunes. Based on the nomenclature of Swink and Wilhelm (1994), Indiana Dunes National Park has 1,206 native plant species. If we include native varieties and hybrids, the total increases to 1,244 taxa. Based on the nomenclature used for this report?the Flora of North America (FNA 2022), and the Integrated Taxonomic Information System (ITIS 2022)?Indiana Dunes National Park houses 1,206 native vascular plant species. As of this writing (2020), the Indiana Dunes is home to 37% of the species of conservation concern in Indiana (241 out of 624 Indiana-listed species): state extirpated = 10 species, state endangered = 75, and state threatened = 100. Thus, 4% of the state-listed species in the Indiana Dunes are extirpated, 31% endangered, and 41% threatened. Watch list and rare categories have been eliminated. Twenty-nine species once documented from the Indiana Dunes may be extirpated because they have not been seen since 2001. Eleven have not been seen since 1930 and 15 since 1978. If we exclude these species, then there would be a total of 1,183 species native to the Indiana Dunes. Many of these are cryptic in their life history or diminutive, and thus are di?cult to ?nd. Looking at the growth form of native plants, <1% (nine species) are clubmosses, 3% (37) are ferns, 8% (297) are grasses and sedges, 56% (682) are forbs or herbs, 1% (16) are herbaceous vines, <1% (7) are subshrubs (woody plants of herbaceous stature), 5% (60) are shrubs, 1% (11) are lianas (woody vines), and 8% (93) are trees. Of the 332 exotic species (species introduced from outside North America), 65% (219 species) are forbs such as garlic mustard (Alliaria petiolata), 15% (50 species) are graminoids such as phragmites (Phragmites australis ssp. australis), 2% (seven species) are vines such as ?eld bindweed (Convulvulus arvensis), <1% (two species) are subshrubs such as Japanese pachysandra (Pachysandra terminalis), 8% (28 species) are shrubs such as Asian bush honeysuckle (Lonicera spp.), 1% (three species) are lianas such as oriental bittersweet (Celastrus orbiculatus), and 8% (23 species) are trees such as tree of heaven (Ailanthus altissimus). Of the 85 adventive species, native species that have invaded from elsewhere in North America, 14% (11 species) are graminoids such as broom sedge (Andropogon virginicus), 57% (48 species) are forbs such as fall phlox (Phlox paniculata), 5% (six species) are shrubs such as Carolina allspice (Calycanthus floridus), 3% (two species) are subshrubs such as holly leaved barberry (Berberis repens), 1% (one species) is a liana (trumpet creeper (Campsis radicans), 3% two species) are herbaceous vines such as tall morning glory (Ipomoea purpurea), and 17% (15 species) are trees such as American holly (Ilex opaca). A total of 436 species were found to be ?special? based on political rankings (federal and state-listed threatened and endangered species), species with charismatic ?owers, and those that are locally rare.
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Hovav, Ran, Peggy Ozias-Akins e Scott A. Jackson. The genetics of pod-filling in peanut under water-limiting conditions. United States Department of Agriculture, gennaio 2012. http://dx.doi.org/10.32747/2012.7597923.bard.
Abstract (sommario):
Pod-filling, an important yield-determining stage is strongly influenced by water stress. This is particularly true for peanut (Arachishypogaea), wherein pods are developed underground and are directly affected by the water condition. Pod-filling in peanut has a significant genetic component as well, since genotypes are considerably varied in their pod-fill (PF) and seed-fill (SF) potential. The goals of this research were to: Examine the effects of genotype, irrigation, and genotype X irrigation on PF and SF. Detect global changes in mRNA and metabolites levels that accompany PF and SF. Explore the response of the duplicate peanut pod transcriptome to drought stress. Study how entire duplicated PF regulatory processes are networked within a polyploid organism. Discover locus-specific SNP markers and map pod quality traits under different environments. The research included genotypes and segregating populations from Israel and US that are varied in PF, SF and their tolerance to water deficit. Initially, an extensive field trial was conducted to investigate the effects of genotype, irrigation, and genotype X irrigation on PF and SF. Significant irrigation and genotypic effect was observed for the two main PF related traits, "seed ratio" and "dead-end ratio", demonstrating that reduction in irrigation directly influences the developing pods as a result of low water potential. Although the Irrigation × Genotype interaction was not statistically significant, one genotype (line 53) was found to be more sensitive to low irrigation treatments. Two RNAseq studies were simultaneously conducted in IL and the USA to characterize expression changes that accompany shell ("source") and seed ("sink") biogenesis in peanut. Both studies showed that SF and PF processes are very dynamic and undergo very rapid change in the accumulation of RNA, nutrients, and oil. Some genotypes differ in transcript accumulation rates, which can explain their difference in SF and PF potential; like cvHanoch that was found to be more enriched than line 53 in processes involving the generation of metabolites and energy at the beginning of seed development. Interestingly, an opposite situation was found in pericarp development, wherein rapid cell wall maturation processes were up-regulated in line 53. Although no significant effect was found for the irrigation level on seed transcriptome in general, and particularly on subgenomic assignment (that was found almost comparable to a 1:1 for A- and B- subgenomes), more specific homoeologous expression changes associated with particular biosynthesis pathways were found. For example, some significant A- and B- biases were observed in particular parts of the oil related gene expression network and several candidate genes with potential influence on oil content and SF were further examined. Substation achievement of the current program was the development and application of new SNP detection and mapping methods for peanut. Two major efforts on this direction were performed. In IL, a GBS approach was developed to map pod quality traits on Hanoch X 53 F2/F3 generations. Although the GBS approach was found to be less effective for our genetic system, it still succeeded to find significant mapping locations for several traits like testa color (linkage A10), number of seeds/pods (A5) and pod wart resistance (B7). In the USA, a SNP array was developed and applied for peanut, which is based on whole genome re-sequencing of 20 genotypes. This chip was used to map pod quality related traits in a Tifrunner x NC3033 RIL population. It was phenotyped for three years, including a new x-ray method to phenotype seed-fill and seed density. The total map size was 1229.7 cM with 1320 markers assigned. Based on this linkage map, 21 QTLs were identified for the traits 16/64 weight, kernel percentage, seed and pod weight, double pod and pod area. Collectively, this research serves as the first fundamental effort in peanut for understanding the PF and SF components, as a whole, and as influenced by the irrigation level. Results of the proposed study will also generate information and materials that will benefit peanut breeding by facilitating selection for reduced linkage drag during introgression of disease resistance traits into elite cultivars. BARD Report - Project4540 Page 2 of 10