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Showing results 85821 to 85840 of 95260
 La suppression de la communauté de La Ramée en 1796 et la vente de l'abbayeHenneau, Marie-Elisabeth  in Coomans, Thomas (Ed.) La Ramée, abbaye cistercienne en Brabant wallon (2002) Detailed reference viewed: 1 (0 ULg) La suppression du nœud de Keith-FlackFredericq, Léon in Bulletin de l'Académie Royale de Médecine de Belgique (1926), VI Detailed reference viewed: 1 (0 ULg)La suppression du nœud de Keith-FlackFredericq, Léon in Archives Internationales de Physiologie (1926), XXVII Detailed reference viewed: 3 (0 ULg)Suppression of a +1 T Mutation by a Nearby Substitution in the Mitochondrial Cox1 Gene of Chlamydomonas Reinhardtii: A New Type of Frameshift Suppression in an Organelle GenomeRemacle, Claire ; Colin, Martine ; Matagne, René-Fernand in Molecular & General Genetics [=MGG] (1998), 259(3), 294-8 In Chlamydomonas reinhardtii, mutants defective in the cytochrome pathway of respiration lack the capacity to grow under heterotrophic conditions (in darkness on acetate). In the dark- strain duM18, a + 1 ... [more ▼] In Chlamydomonas reinhardtii, mutants defective in the cytochrome pathway of respiration lack the capacity to grow under heterotrophic conditions (in darkness on acetate). In the dark- strain duM18, a + 1 T addition in a run of four Ts, located at codon 145 of the mitochondrial cox1 gene encoding subunit I of cytochrome c oxidase, is responsible for the mutant phenotype. A leaky revertant (su11) that grows heterotrophically at a lower rate than wild-type cells was isolated from dum18. Its respiration sensitivity to cyanide was low and its cytochrome c oxidase activity was only 4% of that of the wild-type enzyme. Meiotic progeny obtained from crosses between revertant and wild-type cells inherited the phenotype of the mt- parent, showing that the suppressor mutation, like dum18 itself, is located in the mitochondrial genome. In order to map the su11 mutation relative to dum18, a recombinational analysis was performed on the diploid progeny. It demonstrated that su11 was very closely linked to the dum18 mutation less than 20-30 bp away. The cox1 gene of the su11 revertant was then sequenced. In addition to the + 1 T frameshift mutation still present at codon 145, an A-->C substitution was found at codon 146, leading to the replacement of a glutamic acid by an alanine in the polypeptide chain. No other mutations were detected in the cox1 coding sequence. As the new GCG codon (Ala) created at position 146 is very seldom used in the mitochondrial genome of C. reinhardtii, we suggest that the partial frameshift suppression by the nearby substitution is due to an occasional abnormal translocation of the ribosome (+ 1 base shift) facilitated both by the run of Ts and the low level of weak interaction of alanyl-tRNA. [less ▲] Detailed reference viewed: 4 (0 ULg) SUPPRESSION OF AEROELASTIC INSTABILITIES BY BROADBAND PASSIVE TARGETED ENERGY TRANSFERS; ; et al in Sixth EUROMECH Nonlinear Dynamics Conference, Saint Petersbourg, 2008 (2008, July) We study passive and nonlinear targeted energy transfers induced by transient resonant interactions between an essentially nonlinear attachment and an in-flow rigid wing model. We show that it is feasible ... [more ▼] We study passive and nonlinear targeted energy transfers induced by transient resonant interactions between an essentially nonlinear attachment and an in-flow rigid wing model. We show that it is feasible to partially or even completely suppress aeroelastic instabilities in the wing (limit cycle oscillations-LCOs) by passively transferring broadband vibration energy from the wing to the attachment in a one-way irreversible fashion. We study the nonlinear dynamical mechanisms that govern TET and show that they are series of transient or sustained resonance captures in different resonance manifolds of the dynamics. Aeroelastic instability suppression is performed by partially or completely eliminating the triggering mechanism for aeroelastic instability. Through numerical parametric studies we identify three main mechanisms for suppressing aeroelastic instability, and investigate them in detail, both numerically by Empirical Mode decomposition (EMD), and analytically by slow/fast partitions of the transient dynamics. [less ▲] Detailed reference viewed: 62 (1 ULg)Suppression of limit cycle oscillations with a nonlinear energy sink: experimental results; ; et al in 47th AIAA Structural Dynamics and Materials Conference, Newport, 2006 (2006) The presence of limit cycle oscillations within the flight envelopes of existing aircraft is well documented. Future air vehicle designs are also likely to encounter limit cycle oscillations under certain ... [more ▼] The presence of limit cycle oscillations within the flight envelopes of existing aircraft is well documented. Future air vehicle designs are also likely to encounter limit cycle oscillations under certain loading conditions. These steady-state constant amplitude oscillations are detrimental to mission effectiveness and lead to increased fatigue of aircraft structures. Previous efforts to suppress limit cycle oscillations have focused primarily on active control methods. These efforts have been effective but require significant measurement and control resources. In this study the investigators test a passive method for suppressing limit cycle behavior. A nonlinear energy sink, based on the principle of nonlinear energy pumping, is shown to be effective for increasing the stability threshold of a nonlinear two degree of freedom aeroelastic system. [less ▲] Detailed reference viewed: 50 (3 ULg)Suppression of limit cycle oscillations with a nonlineart energy sink: theoretical basis; ; et al in 47th AIAA Structural Dynamics and Materials Conference, Newport, 2006 (2006, May) Limit cycle oscillations (LCOs) commonly require restrictions on the operation of high- performance aircraft and have the potential to cause structural damage or failure. This paper summarizes recent ... [more ▼] Limit cycle oscillations (LCOs) commonly require restrictions on the operation of high- performance aircraft and have the potential to cause structural damage or failure. This paper summarizes recent theoretical findings on the application of passive and targeted nonlinear energy transfer (\nonlinear energy pumping") for the reduction or elimination of LCOs in self-excited systems. This NES has been used successfully to suppress LCOs of an elastically mounted, rigid airfoil in flow. The theoretical results are in agreement with experimental studies of a practical airfoil with an attached NES. These experimental results, presented in full in a separate paper, verify the capacity of the NES to reduce or even eliminate these undesired oscillations and to extend the operating speed range of the wing. [less ▲] Detailed reference viewed: 42 (3 ULg)Suppression of matching field effects by splay and pinning energy dispersion in YBa2Cu3O7 with columnar defects; Silhanek, Alejandro ; et alin Physical Review. B : Condensed Matter (2001), 63(14), We report measurements of the irreversible magnetization M-i of a large number of YBa2Cu3O7 single crystals with columnar defects (CD). Some of them exhibit a maximum in M-i when the density of vortices ... [more ▼] We report measurements of the irreversible magnetization M-i of a large number of YBa2Cu3O7 single crystals with columnar defects (CD). Some of them exhibit a maximum in M-i when the density of vortices equals the density of tracks, at temperatures above 40 K. We show that the observation of these matching field effects is constrained to those crystals where the orientational and pinning energy dispersion of the CD system lies below a certain threshold. The amount of such dispersion is determined by the mass and energy of the irradiation ions, and by the crystal thickness. Time relaxation measurements show that the matching effects are associated with a reduction of the creep rate, and occur deep into the collective pinning regime. [less ▲] Detailed reference viewed: 7 (3 ULg)Suppression of pattern recognition receptor TLR4 sensing does not alter lung responses to pneumovirus infection; ; et al in Microbes & Infection (2006), 8 Toll-like receptors (TLR) are an important component in the innate immune response to a wide variety of pathogens. Recently, a series of studies has addressed the hypothesis that TLR4 also participates in ... [more ▼] Toll-like receptors (TLR) are an important component in the innate immune response to a wide variety of pathogens. Recently, a series of studies has addressed the hypothesis that TLR4 also participates in the host innate response against respiratory syncytial virus (RSV), the leading cause of lower respiratory tract infections in infants and young children. In most of the studies available, RSV, which is not a natural pathogen of mice, has been systematically used in mouse models of human bronchiolitis, with conflicting results. Pneumonia virus of mice (PVM), a member of the pneumovirus genus, shares many similarities with RSV. The serological and structural relationships that exist between them suggest that the immune response to these viruses may be similar in their respective natural hosts. To determine the role of TLR4 in host defense against PVM, TLR4-competent and TLR4-deficient mice were intranasally infected with PVM. Variation of body weight, pulmonary function values, histopathology, and pulmonary viral loads were analyzed. None of the investigated clinical, functional, histological and virological parameters was different between strains, which demonstrates that the sensitivity of the mouse to its natural pneumovirus infection is independent of the presence or absence of TLR4 sensing. [less ▲] Detailed reference viewed: 16 (1 ULg)Suppression Of Tumor Growth And Cell Proliferation By P13(Ii), A Mitochondrial Protein Of Human T Cell Leukemia Virus Type 1; ; et al in Proceedings of the National Academy of Sciences of the United States of America (2004), 101(17), Detailed reference viewed: 10 (3 ULg)Suppression of Voluntary Temporalis Muscle Activity by Peripheral Limb Stimulations in Healthy Volunteers, Migraineurs and Tension-Type Headache Sufferes; Schoenen, Jean in Functional Neurology (1996), 11(6, Nov-Dec), 307-15 We studied the inhibition of voluntary temporalis muscle activity after stimulations of extracephalic cutaneous or mixed nerves in 23 healthy volunteers, 29 patients suffering from migraine without aura ... [more ▼] We studied the inhibition of voluntary temporalis muscle activity after stimulations of extracephalic cutaneous or mixed nerves in 23 healthy volunteers, 29 patients suffering from migraine without aura, 24 from episodic and 42 from chronic tension-type headache. Two successive EMG suppressions were induced bilaterally after stimulating at 40 mA the index finger or the median nerve, but not after stimulations of the sural or peroneal nerves. They differed from those obtained after labial commissure stimulation at 20 mA, i.e. the classic temporalis silent periods ES1 and ES2. Overall prevalence of index- (3%) and median nerve-induced (16%) early suppression was much lower than that of labial-induced ES1 (100%); prevalence of index-induced late suppression (index-"ES2") was 62% and that of median-"ES2" 48%, compared with 97% for labial-ES2. Latency and duration of index-/median-"ES2" were not significantly different between groups. Index-"ES2" occurred significantly more often in migraineurs (83%) than in controls (48%) suggesting that the spino-bulbar pathways involved in index-/median-"ES2" are hyperexcitable in migraine. [less ▲] Detailed reference viewed: 10 (0 ULg)Suppressions of temporalis muscle activity and their modulations by transcranial magnetic stimulations may reflect direct excitation of the trigeminal nerve or ganglion, and not cortical activationMAERTENS DE NOORDHOUT, Alain ; ; et alin Olesen, J.; Schoenen, Jean (Eds.) Tension-Type Headache: classification, mechanisms and treatment (Frontiers in Headache Research) (1993) Detailed reference viewed: 2 (1 ULg)Suppressor mutagenesis of over-expression of the CONSTANS gene in Arabidopsis; ; et al in Plant & Cell Physiology (2000), 41(supplement), 127 Detailed reference viewed: 13 (1 ULg)Supraconductivité : un modèle pour les sciences du vivant ?Durand, Pascal Article for general public (1995) Detailed reference viewed: 1 (0 ULg)Supramolecular design of high-performance poly(L-lactide)/carbon nanotube nanocomposites: from melt-processing to rheological, morphological and electrical properties; ; et al in Journal of Materials Chemistry (2011), 21(40), 16190-16196 The ability of omega-imidazolium functionalized poly(L-lactide) (ImPLLA) chains to improve the CNT dispersion within the PLLA matrix was demonstrated in bulk and at elevated temperatures using melt ... [more ▼] The ability of omega-imidazolium functionalized poly(L-lactide) (ImPLLA) chains to improve the CNT dispersion within the PLLA matrix was demonstrated in bulk and at elevated temperatures using melt-processing techniques. This approach brings new supramolecular tools to the formation of CNT-based biomaterials derived from renewable resources with outstanding properties for semi-industrial applications. In this work, the PLLA/CNT nanocomposites were prepared using extrusion technology, starting from masterbatches. The rheological, morphological, electrical properties as well as Raman analyses confirmed the establishment of supramolecular cation-pi interactions between ImPLLA and CNT in the melt, leading to a fine dispersion of CNT within PLLA matrix. [less ▲] Detailed reference viewed: 12 (1 ULg)Supramolecular organization of model liquid crystalline ionomers; Jérôme, Robert ; Van den Bossche, Guy et alin Macromolecular Chemistry and Physics (1998), 199(9), 1791-1799 A mesogenic cation was associated with low molecular weight carboxylato- and sulfonato(se-mi)telechelic polymers. These compounds were prepared by ion-exchange of the quaternary ammonium group attached to ... [more ▼] A mesogenic cation was associated with low molecular weight carboxylato- and sulfonato(se-mi)telechelic polymers. These compounds were prepared by ion-exchange of the quaternary ammonium group attached to the mesogen for the metal counterion of the halato(semi)telechelic polymer. The accordingly formed liquid crystalline halato(semi)telechelic polymers (LC H(S)TP's) were analyzed by differential scanning calorimetry (DSC), polarized-light optical microscopy (POM), and small angle X-ray scattering (SAXS). On the basis of these experimental results, a model for the supramolecular organization of the LC H(S)TP's is proposed. The final morphology results from the interplay of two competitive effects: the dipolar interaction of the ion-pairs known for multiplet formation and the propensity of the mesogenic moiety to form mesophases. The outcome of this competition depends on the mobility of the mesogenic counterion, i.e., on the strength of the dipolar interactions, the mobility of the polymer backbone and the mesogen/poly-mer ratio which is controlled by the molecular weight of the polymer. [less ▲] Detailed reference viewed: 13 (3 ULg)Supraorbital transcutaneous neurostimulation has sedative effects in healthy subjects.; ; SAVA, Simona Liliana et alin BMC Neurology (2011), 11 BACKGROUND: Transcutaneous neurostimulation (TNS) at extracephalic sites is a well known treatment of pain. Thanks to recent technical progress, the Cefaly(R) device now also allows supraorbital TNS ... [more ▼] BACKGROUND: Transcutaneous neurostimulation (TNS) at extracephalic sites is a well known treatment of pain. Thanks to recent technical progress, the Cefaly(R) device now also allows supraorbital TNS. During observational clinical studies, several patients reported decreased vigilance or even sleepiness during a session of supraorbital TNS. We decided therefore to explore in more detail the potential sedative effect of supraorbital TNS, using standardized psychophysical tests in healthy volunteers. METHODS: We performed a double-blind cross-over sham-controlled study on 30 healthy subjects. They underwent a series of 4 vigilance tests (Psychomotor Vigilance Task, Critical Flicker Fusion Frequency, Fatigue Visual Numeric Scale, d2 test). Each subject was tested under 4 different experimental conditions: without the neurostimulation device, with sham supraorbital TNS, with low frequency supraorbital TNS and with high frequency supraorbital TNS. RESULTS: As judged by the results of three tests (Psychomotor Vigilance Task, Critical Flicker Fusion Frequency, Fatigue Visual Numeric Scale) there was a statistically significant (p < 0.001) decrease in vigilance and attention during high frequency TNS, while there were no changes during the other experimental conditions. Similarly, performance on the d2 test was impaired during high frequency TNS, but this change was not statistically significant. CONCLUSION: Supraorbital high frequency TNS applied with the Cefaly(R) device decreases vigilance in healthy volunteers. Additional studies are needed to determine the duration of this effect, the underlying mechanisms and the possible relation with the stimulation parameters. Meanwhile, this effect opens interesting perspectives for the treatment of hyperarousal states and, possibly, insomnia. [less ▲] Detailed reference viewed: 9 (0 ULg)Sur ce que l’antipsychologisme husserlien doit à LotzeGyemant, Maria in Boccaccini, Federico (Ed.) Lotze (2011, December 16) Detailed reference viewed: 4 (3 ULg)Sur certaines inégalités fondamentales et leur généralisation dans la théorie des bornes supérieures et inférieures en élasticitéFraeijs de Veubeke, Baudouin in Revue Universelle des Mines (1961) In this paper, the bases of the celebrated dual analysis are given for the first time. Detailed reference viewed: 36 (2 ULg)Sur de nouveaux verres très transparents aux ultra-violetsSwings, Polydore ; in Association Française pour l'Avancement des Sciences (Paris) (Ed.) Compte-rendu de la 56e session, Bruxelles 1932 (1932) Detailed reference viewed: 9 (1 ULg) |
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