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Search Results: 1 - 10 of 2384 matches for " Isabelle Greig "
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Le Sénégal Oriental à l’aube du développement minier
Isabelle Greig
EchoGéo , 2009,
Abstract: On assiste au Sénégal Oriental aux prémices d’un développement minier faisant intervenir des acteurs multiples et inégaux. Les difficultés rencontrées sur le terrain traduisent enjeux invisibles et tensions palpables. Il s’agit d’analyser la position fragile des collectivités locales dans un jeu d’acteurs complexe, placé sous le double signe de la mondialisation économique et d’une décentralisation inaboutie. Région et communautés rurales ont un r le déterminant à jouer dans l’orientation des dynamiques territoriales, à l’articulation d’un horizon national trop lointain et d’un échelon ultra-local survalorisé. Eastern Senegal is faced with the beginnings of a mining activities expansion that involves numerous and unequal players. The difficulties encountered during the survey reflect invisible stakes and palpable tensions. It’s a matter of analyzing the fragile position of local authorities in a complex set of players, facing at the same time economic globalization and unfulfilled decentralization. The region and the rural communities have a determining part to play in the direction of the territorial dynamics, between a distant national level and a too emphasized ultra-local level.
Elections 2008 au Ghana : esquisse de géographie électorale, entre permanences et recompositions
Isabelle Greig
EchoGéo , 2009,
Abstract: Les élections de 2008 au Ghana reflètent la bonne santé démocratique d’un pays qui a fait le choix d’une alternance politique modèle. Deux tendances modèlent la géographie électorale qui en est issue : un maintien des bastions ethno-régionaux des deux partis dominants, et un basculement de quatre régions du Sud dans l’opposition qui témoigne de recompositions complexes à l’échelle infrarégionale sur une base essentiellement socio-économique. The 2008 elections in Ghana reflect the democratic health of a country that has opted for an exemplary political change-over. Two trends shape the electoral geography that arises from the votes: the upholding of the ethno-regional bastions of the two dominant parties, and the swing of four regions to the opposition party, which shows complex developments on a local scale mainly due to socio-economic factors.
A Screen for Recessive Speciation Genes Expressed in the Gametes of F1 Hybrid Yeast
Duncan Greig
PLOS Genetics , 2007, DOI: 10.1371/journal.pgen.0030021
Abstract: Diploid hybrids of Saccharomyces cerevisiae and its closest relative, Saccharomyces paradoxus, are viable, but the sexual gametes they produce are not. One of several possible causes of this gamete inviability is incompatibility between genes from different species—such incompatible genes are usually called “speciation genes.” In diploid F1 hybrids, which contain a complete haploid genome from each species, the presence of compatible alleles can mask the effects of (recessive) incompatible speciation genes. But in the haploid gametes produced by F1 hybrids, recessive speciation genes may be exposed, killing the gametes and thus preventing F1 hybrids from reproducing sexually. Here I present the results of an experiment to detect incompatibilities that kill hybrid gametes. I transferred nine of the 16 S. paradoxus chromosomes individually into S. cerevisiae gametes and tested the ability of each to replace its S. cerevisiae homeolog. All nine chromosomes were compatible, producing nine viable haploid strains, each with 15 S. cerevisiae chromosomes and one S. paradoxus chromosome. Thus, none of these chromosomes contain speciation genes that were capable of killing the hybrid gametes that received them. This is a surprising result that suggests that such speciation genes do not play a major role in yeast speciation.
Asymptotic Expansion of Temperature Close to a Singularity of a Plate  [PDF]
Isabelle Titeux
World Journal of Mechanics (WJM) , 2011, DOI: 10.4236/wjm.2011.13015
Abstract: The thermal conduction in a thin laminated plate is considered here. The lateral surface of the plate is not regular. Consequently, the boundary of the middle plane admits a geometrical singularity. Close to the origin, the lateral edge forms an angle. We shall prove that the classical bidimensional problem associated with the thin plate problem is not valid. In this paper, using the boundary layer theory, we describe the local behavior of the plate, close to the perturbation.
Peri-Orbital Non-Invasive and Painless Skin Tightening-Safe and Highly Effective Use of Multisource Radio-Frequency Treatment Platform  [PDF]
Isabelle Rousseaux
Journal of Cosmetics, Dermatological Sciences and Applications (JCDSA) , 2015, DOI: 10.4236/jcdsa.2015.53025
Abstract: The periorbital area is the third highest-ranking area for cosmetic surgery. However, surgery in this area presents a number of difficulties and safety concerns. First generation Monopolar RF treatments in this area were usually associated with considerable pain and long downtime. In the present clinical study, we used the iFine handpiece of the EndyMed PRO, multi-source phase-controlled radiofrequency (RF) for Non-invasive, pain free, skin rejuvenation of the periorbital area. The study included eleven (11) subjects, treated for periorbital signs of aging (iFine handpiece, EndyMed PRO platform, EndyMed Medical, Caesarea, Israel). The degree of clinical improvement was assessed by the global aesthetic improvement scale (GAIS) and subjects satisfaction by post treatment questionnaires. 91% of patients showed good to excellent improvement as a result of the treatment. Subjects satisfaction showed that 55% of patients reported that they were very satisfied, 45% were satisfied while none were dissatisfied. There were no incidences of infections, scarring, hypopigmentation, or any other serious complications.
Praxis, Language, Dialogue
Brandon Claycomb, Greig Mulberry
Human Affairs , 2007, DOI: 10.2478/v10023-007-0016-7
Abstract: Human engagement with the world develops and evolves into increasingly social, complex, and explicit modes. This essay examines the evolution of meaningful human engagement from simple embodied activity, to language-less social praxis, and then to praxis incorporating increasingly rich forms of linguistic action, culminating in theory. Each mode of meaningful engagement creates a space in which new modes of meaning can develop. These new ways of experiencing, acting, and communicating create their own meaning contexts, which provide the settings for the further evolution of humans' phenomenological, hermeneutic, and practical involvements. Each mode of meaning gives rise to its successors, allowing humans to acquire new powers to understand and manipulate their environments and each other. This increase and refinement of human power raises ethical issues that we address using the Gadamerian concept of dialogue.
The necessity of data availability in maintaining the value and longevity of paleointensity results
Greig A. Paterson
Frontiers in Earth Science , 2014, DOI: 10.3389/feart.2014.00033
Abstract: Asserting the reliability of paleointensity estimates, or comparing relative reliabilities between vastly or subtly different results is a key challenge for paleointensity studies, which often leaves interpretations of these data rife with ambiguities. How we define reliable data is a concept that changes as our understanding of data and experiments advances. As a community we need to take steps to push this forward in an objective fashion that provides the most benefit, not just for paleointensity analysts, but also for those who ultimately wish to use the data to better understand deep Earth processes. However, in this ever-changing landscape, we must also ensure that the data we obtain do not lose their value as our advances threaten to make published data obsolete. It remains unknown exactly how our ability to assess the reliability of data will change and what information will become relevant. It is therefore essential for paleointensity studies to report as much data and meta-data as possible and, ideally, publically archive their measurement data for future reanalysis. Such practices are important, not only for paleointensity studies, but science in general and their implementation is vital to the future of paleomagnetism.
Determination of the CP-violating phase in $B^0_s \to J/ψφ$ decays at LHCb
Greig A Cowan
Physics , 2010,
Abstract: Flavour-tagged, time-dependent, angular analysis of the decay $B^0_s \to J/\psi \phi$ allows the determination of a CP-violating phase which in the Standard Model is denoted $-2\beta_s$, and is predicted to be very small. Many models of new physics lead to significant enhancements in the value of this observable. LHCb has the capability to improve significantly the existing experimental knowledge on this phase with the data expected in the 2010 run, and to probe down to the Standard Model prediction within a few years of operation. The steps in this measurement programme will be presented. Discussion will also be given to other methods to determine this phase, and related measurements in the $B^0_s$ sector.
Measurements of CP violation in B mixing through $B \to J/ψX$ decays at LHCb
Greig A. Cowan
Physics , 2015,
Abstract: B mesons provide an ideal laboratory for measurements of CP violation and searches for CP violation beyond the Standard Model. Recent measurements of the mixing phases of the $B_s^0$ and $B^0$ mesons, $\phi_s$ and $\sin2\beta$, using decays to $J/\psi X$ final states are presented. In view of future improved measurements, a good understanding of pollution from sub-leading penguin topologies in these decays is needed. Those can be probed using suppressed decays like $B_s^0 \to J/\psi K_S^0$ and $B_s^0 \to J/\psi \overline{K}^{*0}$. Recent results using these decay modes are presented.
Prezygotic reproductive isolation between Saccharomyces cerevisiae and Saccharomyces paradoxus
Calum J Maclean, Duncan Greig
BMC Evolutionary Biology , 2008, DOI: 10.1186/1471-2148-8-1
Abstract: We set up mate choice tests, using five independently isolated pairs of species, in which individual germinating spores were presented with the opportunity to mate either with a germinating spore of their own species or with a germinating spore of the other species. For all five strain pairs, whether a S. cerevisiae or S. paradoxus occupies the role of "chooser" strain, the level of hybridisation that is observed between the two species is significantly lower than would be expected if mates were selected at random. We also show that, overall, S. cerevisiae exhibited a stronger own-species preference than S. paradoxus.Prezygotic reproductive isolation is well known in higher organisms but has been largely overlooked in yeast, an important model microbe. Here we present the first report of prezygotic reproductive isolation in Saccharomyces. Prezygotic reproductive isolation may be important in yeast speciation or yeast species cohesion, and may have evolved to prevent wasted matings between different species. Whilst yeast has long been used as a genetic model system, little is known about yeast in the wild. Our work sheds light on an interesting aspect of yeast natural behaviour: their ability to avoid costly interspecific matings.The biological species concept defines a species as an interbreeding group that is reproductively isolated from other such groups [1]. Species are isolated by barriers that either prevent fertilisation between species (prezygotic barriers) or those that allow fertilisation but make the resulting hybrid sterile or inviable (postzygotic barriers) [2] (for a review see [3]).Mating in yeast occurs through the fusion of haploid gametes. When starved, diploid Saccharomyces yeast cells produce haploid spores by meiosis. Each diploid cell produces four dormant and resilient haploid spores, two spores of each mating type (a and α). When nutrients become available again the spores germinate to become metabolically active gametes. Gametes of both matin
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