The objective of this work is to compare density and density fluctuations of silica as a function of temperature in the anomalous domain between 950 and 1480°C via Archimedes? macroscopic measurements and light scattering. Parallel qualitative behaviour is also recorded between density fluctuations and macroscopic density. Density fluctuations of silica show a minimum as a function of temperature, as with macroscopic density. This correlation indicates a possible common origin of both observations.
In this paper, we present results on UV pulsed laser-induced birefringence in La2O3?B2O3?GeO2 (LBG) glasses. Samples were irradiated at a wavelength of 355?nm delivered by an Nd?YAG laser operating in the nanosecond regime. After irradiation, glasses were analyzed by micro-Raman spectroscopy and small angle X-ray scattering (SAXS). Raman spectra show figures characteristic of a light polarization rotation effect in agreement with an anisotropic distribution of the scattering intensity observed by SAXS measurements. These results are interpreted as the interaction of the (...) glass with the electromagnetic field of the UV beam (UV poling). (shrink)
A simplified model using kinetic logic is proposed to approach the problem after Hepatitis B viral (HBV) infection. It accounts for several stable regimes or attractors corresponding to the essential dynamic behaviour of the replication of the Hepatitis B virus. Infection with the virus can result in viral clearance, fulminant hepatic failure and death, or chronic transmissible infection, that is multistationarity corresponding to the existence of the positive feedback circuit in our modelling. Another implication of this model is the existence (...) of oscillations or homeostatic mechanisms, sometimes observed in the viral cycle, consistent with the existence of the negative feedback circuit. Thus, this report shows how a simple model of kinetic logic may be used to account for the variety of manifestations of HBV infection. This model implies the presence of the Hepatitis B e antigen, whose conservation suggests that it plays an important role in the life cycle of hepadnaviruses. Its function in the viral cycle is still unknown, but our model suggests that this antigen could explain the passage from one state of the viral infection (acute or latent) to another, as well as the oscillatory behavior which may account for the intermittent symptoms of hepatitis observed in some patients. Furthermore, this model shows a virgin state. This state is also reached after recovery. The model proposed demonstrates that starting from a viral acute infection, the host's immune response, depending on the immunological status of the patient, can lead to viral clearance, or to periodic spontaneous reactivation. (shrink)
The molecular biology of viruses can be effectively described by kinetic logic as several feedback loops are implicated in all viral cycles and as viral proteins generally display several functions. We applied this method to the study of the rhabdovirus cycle.Formally, the dynamics of the model are explored on the basis of a discrete caricature (kinetic logic), with special emphasis on the role of the constitutive feedback loops to determine the essential dynamical behaviour of the viral cycle. From a biological (...) point of view, our model accounts for several stable regimes or attractors: healthy cells, acute infection and different kinds of persistent infections, a multistationarity in good agreement with the existence of several positive feedback loops in our system. (shrink)
Claire Strom: Making Catfish Bait Out of Government Boys: The Fight Against Cattle Ticks and the Transformation of the Yeoman South Content Type Journal Article Pages 1-4 DOI 10.1007/s10806-010-9236-8 Authors Mark V. Juhasz, University of Guelph Rural Studies Programme, School of Environmental Design and Rural Development Guelph Ontario N1G 2W1 Canada Journal Journal of Agricultural and Environmental Ethics Online ISSN 1573-322X Print ISSN 1187-7863 Journal Volume Volume Journal Issue Volume.
« Les rythmes scolaires » avec Claire Leconte – le 16 mai 2013 de 15:30 à 16:00 sur France Culture. Claire Leconte est professeur émérite de psychologie de l'éducation et spécialiste des rythmes de l'enfant et de l'adolescent, chercheur au laboratoire Psitec de l'université de Lille3. C. Leconte, Des rythmes de vie aux rythmes scolaires : quelle histoire !, Lille, Presses Universitaires du Septentrion, (...) - Actualités.
Rousseau's Julie, ou La Nouvelle Héloïse is two novels in one: a story of wifely virtue and a counterstory of women's friendship. Whereas the virtue story exemplifies what feminist readers since Mary Wollstonecraft have considered to be the most oppressive of Rousseau's prescriptions for women, the friendship counterstory questions the ethical foundations and social manifestations of the model of patriarchal authority that Rousseau ordinarily defends. In this essay, I read the novel with an eye for both stories and the tension (...) between them. (shrink)
La publication de The Anatomy of Melancoly de Robert Burton en 1621 marque un tournant dans l’histoire de cette célèbre maladie, déjà analysée dans le Problème XXX du corpus aristotélicien. Burton, en effet, ne se contentait pas de construire une sorte d’encyclopédie du savoir philosophique et médical sur la mélancolie, qu’il considérait comme la quintessence de toutes les maladies ; il en proposait aussi de nouvelles interprétations, notamment en abordant la mélancolie sous l’angle de ses co..