Search results for "Stone"
showing 10 items of 1137 documents
Network Analysis of Platform Ecosystems: The Case of Internet of Things Ecosystem
2015
Software platform providers are often seen as the cornerstone of their business ecosystem, where the other ecosystem players utilize the platform’s standardized components together with complementary components for making applications. These platforms are also becoming a cornerstone of the emerging Internet of Things (IoT) business ecosystem comprised of the companies who provide Internet-enabled devices, applications, connectivity solutions, and the platforms for the IoT usage. While a number of enabling technologies for IoT is available, the question remains what kind of ecosystem emerges around IoT platform providers and whether this ecosystem is evolving in line with the theoretical mod…
Importance of dispersal and thermal environment for mycorrhizal communities: lessons from Yellowstone National Park
2011
International audience; The relative importance of dispersal and niche restrictions remains a controversial topic in community ecology, especially for microorganisms that are often assumed to be ubiquitous. We investigated the impact of these factors for the community assembly of the root-symbiont arbuscular mycorrhizal fungi (AMF) by sampling roots from geothermal and nonthermal grasslands in Yellowstone National Park (YNP), followed by sequencing and RFLP of AMF ribosomal DNA. With the exception of an apparent generalist RFLP type closely related to Glomus intraradices, a distance-based redundancy analysis indicated that the AMF community composition correlated with soil pH or pH-driven c…
Water capillary absorption in porous media in different wettability conditions studied by Quantitative MRI and X-ray CT
2007
X-ray computed tomography (CT) and magnetic resonance imaging (MRI) have been successfully applied to study both the capillary properties of several samples of Lecce stone and the performances of treatments used for protection and conservation of historical stone artifacts. The presence of water inside the sample may be visualized by both MRI and X-ray CT. For the treated samples, the different dynamics of water absorption gives indirectly the efficacy of the polymer in the rock.
Reclaimed asphalt test specimen preparation assisted by image analysis
2015
This paper presents a laboratory investigation aimed at establishing a protocol for the production of homogeneous asphalt mixtures test specimens, incorporating reclaimed asphalt by using a gyratory compactor with coring and trimming works. Stone mastic asphalt specimens were compacted at the previously identified target densities with the final aim of obtaining specimens with a fixed and homogeneous air void distribution. A microstructural study was conducted to characterize the homogeneity in the air void distribution using X-ray computed tomography (CT) combined with image analysis techniques. The study concluded that the gyratory compactor is suitable for producing homogeneous test spec…
Exposition continue aux xéno-hormones à faibles doses chez le rat : effets multi-générationnels de mélanges sur les préférences gustatives, le compor…
2012
During the last decade, the issue of health-related endocrine disruptors (ED) has been extended to the toxicity of mixtures. The objective of this study was to define the effects of lifelong exposure to ED mixtures, at low doses defined as "non-harmful" by the authorities. In this aim, the effects of mixtures combining genistein, vinclozolin and bisphenol A, have been investigated in the rat by using an integrative and multi-generational experimental approach which takes into account maternal behavior, feeding behavior and development. Our results show that these mixtures could: a) reduce maternal behavior, b) change taste preferences (sweet, salty), c) affect the development from the in ut…
The significance of dropstones in a tropical lacustrine setting, eastern Cameros Basin (Late Jurassic–Early Cretaceous, Spain)
2004
International audience; Outsized clasts (mainly white quartzite pebbles) are found in carbonate deposits of the Enciso Group exposed on the northern border of the Cameros rift basin (Late Jurassic – Early Cretaceous, northern Spain). In the Arnedillo section, all the stones are enclosed in micrite, which was assumed deposited in littoral to open lacustrine environments, with minor inputs of deltaic sandstones. The clasts are found in fine-grained lacustrine sediments either as isolated stones or as loosely packed elongated clusters occasionally associated with quartz sands and gravels. The mean size of the clasts is 40 mm (range: 3 – 100 mm); they are polished, well-rounded, and lack any fa…
Educatrices anglaises et tourmente révolutionnaire : infléchissement des pratiques et des discours à la fin du dix-huitième siècle
2006
L'Angleterre du dix-huitième siècle, en grande partie parce qu'elle est un pays de tradition protestante, a une problématique légèrement différente de la France à la fois sur l'enseignement des femmes et sur leur éducation. Chez les éducatrices à la pensée politique la plus radicale, le déclenchement de la Révolution française suscite les espoirs d'une égalité des sexes et d'un traitement commun des filles et des garçons dans le cadre d'un renouvellement du système éducatif. Il est intéressant de mettre en lumière, après un aperçu de la situation anglaise à la veille de 1789, cette influence de la Révolution sur la pensée des femmes éducatrices en Angleterre, en s'attachant particulièrement…
Les histones désacétylases de type 2 (HD2) : caractérisation fonctionnelle dans l'immunité des plantes
2016
Les histones désacétylases (HDAC) sont des enzymes qui catalysent les réactions de désacétylation des protéines, une modification post-traductionnelle caractérisée par le retrait d’un groupement acétyle des chaînes latérales des résidus de lysine des protéines. Chez les plantes, il existe trois familles de HDAC. Les deux premières – les familles RDP3/HDA1 et SIR2 – sont communes à tous les eucaryotes, alors que la troisième – la famille des HD2 – est spécifique des plantes. Chez le tabac, des HD2 ont été identifiées comme des régulateurs négatifs de la réponse hypersensible induite par la cryptogéine, un éliciteur protéique. La réponse hypersensible est une réponse de défense caractérisée p…
Rôle des histones désacétylases de type 2 dans le contrôle de l’immunité chez les plantes
2014
Rapport de stage de Master II R SPE IPM; Master
Etude de la régulation d'une histone déacetylase de type 2 dans le contexte des réactions de défense des plantes
2012
Rapport de stage de Master 2, Spécialité Biochimie Biologie Cellulaire et Moléculaire SPE IPM CT non renseigné car non soutenu par INRA; Master