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Search Results: 1 - 10 of 402776 matches for " Bastien Métraux "
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The Somnogen Visual Training a New CBT to Fight Insomnia through Closed Eyes and fNIRS Neuroimaging  [PDF]
Pierre-Alain Grounauer, Bastien Métraux
Journal of Behavioral and Brain Science (JBBS) , 2014, DOI: 10.4236/jbbs.2014.410047
Abstract: The use of a red light observed through closed eyes is a new CBT Cognitive Behavioral Therapy to fight insomnia. Its principles are based on the high transmission of the colour red through eyelids, the great sensitivity to light of the retina when it is adjusted to darkness and the mental distraction obtained by the perception and attentive observation of variations of intensity. The prefrontal and occipital fNIRS recordings document this method which is correlated to the sleep EEG state II.
Insomnia Fighting with Red Led Pulsations  [PDF]
Pierre-Alain Grounauer, Bastien Métraux
Journal of Behavioral and Brain Science (JBBS) , 2018, DOI: 10.4236/jbbs.2018.811038
Abstract: This study shows how and why luminous red pulsations can distract the mind and facilitate sleep by preventing disruptive thoughts and memories. The rgb LED produces a miniature dusk-to-dawn flight device to pass from red at night to white at dawn, potentially followed by luminotherapy. Combined in a single portable device, these luminous parameters are useful in the fight against insomnia through cognitive behavioral therapy CBT.
Antifungal properties of Norway spruce (Picea abies (L.) Karst.) seedling homogenates
Grzegorz Koz?owski,Jean P. Métraux
Acta Societatis Botanicorum Poloniae , 1999, DOI: 10.5586/asbp.1999.025
Abstract: The presence of antimicrobials in root, hypocotyl and cotyledon homogenates of Norway spruce was studied using in vitro assays with soil-borne pathogens. For the studies presented here Norway spruce (Picea abies (L.) Karst.) as a typical host and forest tree and Pythium as a typical soil-bome pathogen were used. The highly virulent species Pythium ultimum and the less virulent species Pythium irregulare were chosen for all experiments. They are both the causal agents of damping-off disease, which can affect plants at a very early stage. The strongest antimicrobial effect was observed using medium prepared from older seedlings and containing extracts from cotyledons. The influence of various treatments on antimicrobials accumulation in spruce extracts was also tested. Seed coat shedding was observed to affect mortality of Picea abies seedlings infected by Pythium. Seedlings which had shed their seed coats were more resistant to Pythium attack. This phenomenon could be correlated with antimicrobial production in well developed cotyledons.
The Protein Phosphatase 7 Regulates Phytochrome Signaling in Arabidopsis
Thierry Genoud, Marcela Trevi?o Santa Cruz, Tea Kulisic, Francesca Sparla, Christian Fankhauser, Jean-Pierre Métraux
PLOS ONE , 2008, DOI: 10.1371/journal.pone.0002699
Abstract: The psi2 mutant of Arabidopsis displays amplification of the responses controlled by the red/far red light photoreceptors phytochrome A (phyA) and phytochrome B (phyB) but no apparent defect in blue light perception. We found that loss-of-function alleles of the protein phosphatase 7 (AtPP7) are responsible for the light hypersensitivity in psi2 demonstrating that AtPP7 controls the levels of phytochrome signaling. Plants expressing reduced levels of AtPP7 mRNA display reduced blue-light induced cryptochrome signaling but no noticeable deficiency in phytochrome signaling. Our genetic analysis suggests that phytochrome signaling is enhanced in the AtPP7 loss of function alleles, including in blue light, which masks the reduced cryptochrome signaling. AtPP7 has been found to interact both in yeast and in planta assays with nucleotide-diphosphate kinase 2 (NDPK2), a positive regulator of phytochrome signals. Analysis of ndpk2-psi2 double mutants suggests that NDPK2 plays a critical role in the AtPP7 regulation of the phytochrome pathway and identifies NDPK2 as an upstream element involved in the modulation of the salicylic acid (SA)-dependent defense pathway by light. Thus, cryptochrome- and phytochrome-specific light signals synchronously control their relative contribution to the regulation of plant development. Interestingly, PP7 and NDPK are also components of animal light signaling systems.
Results and Conjectures about Order Lyness' Difference Equation in , with a Particular Study of the Case
Bastien G,Rogalski M
Advances in Difference Equations , 2009,
Abstract: We study order Lyness' difference equation in , with and the associated dynamical system in . We study its solutions (divergence, permanency, local stability of the equilibrium). We prove some results, about the first three invariant functions and the topological nature of the corresponding invariant sets, about the differential at the equilibrium, about the role of 2-periodic points when is odd, about the nonexistence of some minimal periods, and so forth and discuss some problems, related to the search of common period to all solutions, or to the second and third invariants. We look at the case with new methods using new invariants for the map and state some conjectures on the associated dynamical system in in more general cases.
On the algebraic difference equations un+2un = ψ(un+1) in , related to a family of elliptic quartics in the plane
Bastien G,Rogalski M
Advances in Difference Equations , 2005,
Abstract: We continue the study of algebraic difference equations of the type un+2un = ψ(un+1), which started in a previous paper. Here we study the case where the algebraic curves related to the equations are quartics Q(K) of the plane. We prove, as in "on some algebraic difference equations un+2un = ψ(un+1) in , related to families of conics or cubics: generalization of the Lyness' sequences" (2004), that the solutions Mn = (un+1, un) are persistent and bounded, move on the positive component Q0(K) of the quartic Q(K) which passes through M0, and diverge if M0 is not the equilibrium, which is locally stable. In fact, we study the dynamical system F(x, y) = ((a + bx + cx2)/y(c + dx + x2), x), (a, b, c, d) ∈ +4, a + b > 0, b + c + d > 0, in , and show that its restriction to Q0 (K) is conjugated to a rotation on the circle. We give the possible periods of solutions, and study their global behavior, such as the density of initial periodic points, the density of trajectories in some curves, and a form of sensitivity to initial conditions. We prove a dichotomy between a form of pointwise chaotic behavior and the existence of a common minimal period to all nonconstant orbits of F.
On the algebraic difference equations un+2un= (un+1) in ¢ ¢ —+, related to a family of elliptic quartics in the plane
G. Bastien,M. Rogalski
Advances in Difference Equations , 2005, DOI: 10.1155/ade.2005.227
Abstract: We continue the study of algebraic difference equations of the type un+2un= (un+1), which started in a previous paper. Here we study the case where the algebraic curves related to the equations are quartics Q(K) of the plane. We prove, as in ¢ € on some algebraic difference equations un+2un= (un+1) in ¢ ¢ —+, related to families of conics or cubics: generalization of the Lyness' sequences ¢ € (2004), that the solutions Mn=(un+1,un) are persistent and bounded, move on the positive component Q0(K) of the quartic Q(K) which passes through M0, and diverge if M0 is not the equilibrium, which is locally stable. In fact, we study the dynamical system F(x,y)=((a+bx+cx2)/y(c+dx+x2),x), (a,b,c,d) ¢ ¢ +4, a+b>0, b+c+d>0, in ¢ ¢ —+2, and show that its restriction to Q0(K) is conjugated to a rotation on the circle. We give the possible periods of solutions, and study their global behavior, such as the density of initial periodic points, the density of trajectories in some curves, and a form of sensitivity to initial conditions. We prove a dichotomy between a form of pointwise chaotic behavior and the existence of a common minimal period to all nonconstant orbits of F.
Results and Conjectures about Order q Lyness' Difference Equation un+qun=a+un+q 1+ +un+1 in +, with a Particular Study of the Case q=3
G. Bastien,M. Rogalski
Advances in Difference Equations , 2009, DOI: 10.1155/2009/134749
Abstract: We study order q Lyness' difference equation in +:un+qun=a+un+q 1+ +un+1, with a>0 and the associated dynamical system Fa in +q. We study its solutions (divergence, permanency, local stability of the equilibrium). We prove some results, about the first three invariant functions and the topological nature of the corresponding invariant sets, about the differential at the equilibrium, about the role of 2-periodic points when q is odd, about the nonexistence of some minimal periods, and so forth and discuss some problems, related to the search of common period to all solutions, or to the second and third invariants. We look at the case q=3 with new methods using new invariants for the map Fa2 and state some conjectures on the associated dynamical system in +q in more general cases.
Usability testing: a review of some methodological and technical aspects of the method
J. M. Christian Bastien
Computer Science , 2010, DOI: 10.1016/j.ijmedinf.2008.12.004
Abstract: The aim of this paper is to review some work conducted in the field of user testing that aims at specifying or clarifying the test procedures and at defining and developing tools to help conduct user tests. The topics that have been selected were considered relevant for evaluating applications in the field of medical and health care informatics. These topics are: the number of participants that should take part in a user test, the test procedure, remote usability evaluation, usability testing tools, and evaluating mobile applications.
Transcriptome responses to aluminum stress in roots of aspen (Populus tremula)
Nadine Grisel, Stefan Zoller, Marzanna Künzli-Gontarczyk, Thomas Lampart, Martin Münsterk?tter, Ivano Brunner, Lucien Bovet, Jean-Pierre Métraux, Christoph Sperisen
BMC Plant Biology , 2010, DOI: 10.1186/1471-2229-10-185
Abstract: Treatment of the aspen roots with 500 μM Al induced a strong inhibition of root growth within 6 h of exposure time. The root growth subsequently recovered, reaching growth rates comparable to that of control plants. Changes in gene expression were determined after 6 h, 2 d, and 10 d of Al exposure. Replicated transcriptome analyses using the Affymetrix poplar genome array revealed a total of 175 significantly up-regulated and 69 down-regulated genes, of which 70% could be annotated based on Arabidopsis genome resources. Between 6 h and 2 d, the number of responsive genes strongly decreased from 202 to 26, and then the number of changes remained low. The responses after 6 h were characterized by genes involved in cell wall modification, ion transport, and oxidative stress. Two genes with prolonged induction were closely related to the Arabidopsis Al tolerance genes ALS3 (for Al sensitive 3) and MATE (for multidrug and toxin efflux protein, mediating citrate efflux). Patterns of expression in different plant organs and in response to Al indicated that the two aspen genes are homologs of the Arabidopsis ALS3 and MATE.Exposure of aspen roots to Al results in a rapid inhibition of root growth and a large change in root gene expression. The subsequent root growth recovery and the concomitant reduction in the number of responsive genes presumably reflect the success of the roots in activating Al tolerance mechanisms. The aspen genes ALS3 and MATE may be important components of these mechanisms.Acid soils are prevalent in many regions of the world and present a range of stresses to plants. One of the major stresses caused by these soils is aluminum (Al), which is solubilized by the acidity into the soil solution. Soluble Al exists in its most toxic form as Al3+, which can inhibit root growth in many plant species at micromolar concentrations. The resulting reduced and damaged root system limits the capacity of plants to uptake water and nutrients, and increases their suscep
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