2,454 research outputs found
Physics and hydraulics of the rhizosphere network
No full textAbstract Take home message Mucilage secreted by roots and EPS produced by microorganisms alter the physical properties of the soil solution and impact the water dynamics in the rhizosphere. The high viscosity of mucilage and EPS is responsible for the formation of thin filaments and interconnected thin lamellae that span throughout the soil matrix maintaining the continuity of the liquid phase across the pore space even during severe drying. The impact of these mechanisms on plant and microorganisms needs to be explored.Deutsche Forschungsgemeinschaft https://doi.org/10.13039/50110000165
Impact of Pore-Scale Wettability on Rhizosphere Rewetting
No full textVast amounts of water flow through a thin layer of soil around the roots, the rhizosphere, where high microbial activity takes place—an important hydrological and biological hotspot. The rhizosphere was shown to turn water repellent upon drying, which has been interpreted as the effect of mucilage secreted by roots. The effects of such rhizosphere water dynamics on plant and microbial activity are unclear. Furthermore, our understanding of the biophysical mechanisms controlling the rhizosphere water repellency remains largely speculative. Our hypothesis is that the key to describe the emergence of water repellency lies within the microscopic distribution of wettability on the pore-scale. At a critical mucilage content, a sufficient fraction of pores is blocked and the rhizosphere turns water repellent. Here we tested whether a percolation approach is capable to predict the flow behavior near the critical mucilage content. The wettability of glass beads and sand mixed with chia seed mucilage was quantified by measuring the infiltration rate of water drops. Drop infiltration was simulated using a simple pore-network model in which mucilage was distributed heterogeneously throughout the pore space with a preference for small pores. The model approach proved capable to capture the percolation nature of the process, the sudden transition from wettable to water repellent and the high variability in infiltration rates near the percolation threshold. Our study highlights the importance of pore-scale distribution of mucilage in the emergent flow behavior across the rhizosphere
Samuel Beckett and the Writers of Port-Royal
No full textIt has been observed that ‘the literary influences on Beckett have been far more important than has been acknowledged, and more important indeed, than the philosophical influences’ (Smith 2002: 3). The truth of this statement is evidenced by the description that scholars have given of Samuel Beckett’s relationship to seventeenth century French classicism. To date, critical interest has been limited for the most part to the figure of the philosopher René Descartes on the (fragile) grounds that Beckett was exclusively concerned with the Cartesian imperative of clarity and order, the fundamental dualism between body and mind, and Nominalism.
Together with the assumption that Beckett’s vision was essentially Cartesian, his literary filiation with Pascal was suggested by critics, but only in terms of Beckett’s formal approach to the theatre. In his short article on En attendant Godot in 1953, the playwright Jean Anouilh was among the first reviewers to suggest that Beckett’s drama synthesizes the encounter between ‘classicism’ and a ‘modern’ form of art. It is well known that Beckett retained a lifelong admiration for Pascal – indeed, Pascal was one of his ‘old chestnuts’ (Knowlson 1997: 653). Little attention has been paid, however, to the originality of Pascal’s thought, the specific nature of his prose, and the impact these might have had upon Beckett’s mature work, especially the trilogy and the subsequent short prose. Yet, in the literary and philosophical context of post-war France, Beckett’s filiation with Pascal, their corresponding preoccupations, were evident to his contemporaries, who identified Pascal as an underlying presence in his works
Sabil and Wikala of Dhul Fiqar Oda Bashi
No full textinterior, courtyard, "Vue de l'Okel Zoulfiqar," color plate XLIV of Pascal Coste's "Architecture arabe; ou, Monuments du Kaire, mesurés et dessinés, de 1818 à 1826", 1818-182
First person - Aude Pascal
No full textInternational audienceFirst Person is a series of interviews with the first authors of a selection of papers published in Journal of Cell Science, helping early-career researchers promote themselves alongside their papers. Aude Pascal is first author on `Annexin A2 and Ahnak control cortical NuMA-dynein localization and mitotic spindle orientation', published in JCS. Aude is a research assistant in the lab of Re ' gis Giet at University of Rennes, France, who is particularly interested in developmental biology. She has always been struck by the fact that a whole organism displaying multiple functions arises from a single cell. For this reason, she has oriented her research on mitosis and meiosis to study the different steps, components and structures involved in these processes
Pascal Tutorial, 1987
No full textThere exists a limited number of tutorials for the Pascal programming language using the Apple Computer. The demand for these tutorials exceeds the supply. In this thesis an attempt was made to rectify this shortage by designing a Pascal tutorial for the Apple computer. This Pascal tutorial is designed to assist with instructing an introductory computer programming course in Pascal, incorporating Apple Superpilot as the authoring language. Emphasis is placed on making the program "user friendly." A person with no previous programming experience should be able to easily execute this tutorial. The information presented as the subject matter of the tutorial will follow the guidelines recommended by the Association for Computing Machinery
Architecture arabe; ou, Monuments du Kaire, mesurés et dessinés, de 1818 à 1826
No full textgeneral view, "Vue des Tombeaux au Nord-Est de la Ville," color plate LXIII of Pascal Coste's "Architecture arabe; ou, Monuments du Kaire, mesurés et dessinés, de 1818 à 1826", 1818-182
Gamia el-Muaiyad
No full textinterior, qibla wall, "Vue de la Niche du Sanctuaire et de la Chaire de la Mosquee el Moyed"," color plate XXVIII of Pascal Coste's "Architecture arabe; ou, Monuments du Kaire, mesurés et dessinés, de 1818 à 1826", 1818-182
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