Note: This page contains sample records for the topic leur influence sur from Science.gov.
While these samples are representative of the content of Science.gov,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of Science.gov
to obtain the most current and comprehensive results.
Last update: November 12, 2013.
1

Influence du passage de Salmonella spp. et E. coli en eaux usees sur leur survie ulterieure en eau de mer  

Microsoft Academic Search

Sewage treatment plants are designed to purify wastewaters for given parameters, but their microbiological effectiveness is often poor without addition of a specific treatment (disinfection, filtration, etc.). Large amounts of enteric bacteria are thus released into the environment, in rivers and seawater. Is their subsequent survival in these hostile environments influenced by their previous stay in wastewaters? In order to

E Dupray; A Derrien

1995-01-01

2

Effects of Meteorological Conditions and Measurement Precision on the Earth Trace of the Sonic Boom Wake (Extinction, Focalization) Influence des Conditions Meteorologiques et de Leur Precision sur la Position au Sol du Tapis de Bang (Extinction, Focallsation Sous Trace).  

National Technical Information Service (NTIS)

The influence of meteorological conditions and the precision of the measurement of meteorological parameters on the prediction of the aircraft sonic boom path on the ground is discussed. It was found that the sonic boom of the second sounding of the two d...

M. Schaffar F. Schlosser

1973-01-01

3

Influence des inclusions sur la rupture d'un acier faiblement allié  

NASA Astrophysics Data System (ADS)

L'étude de la rupture d'un acier faiblement allié dans le domaine de la transition ductile fragile a permis de mettre en évidence la présence croissante, avec la température de sollicitation, d'amas d'inclusions de seconde phase sur les surfaces de rupture. On montre, à l'aide de modélisations par éléments finis, que ces amas jouent néanmoins un rôle mineur dans le déclenchement du clivage. En revanche, leur influence sur la propagation de la rupture ductile est importante. On peut alors expliquer l'anisotropie de la résilience en prenant en compte la géométrie des inclusions et leur répartition spatiale.

Hausild, P.; Berdin, C.; Bompard, P.; Prioul, C.

2003-03-01

4

Les attitudes des ménages : leur signification  

Microsoft Academic Search

[fre] Les attitudes des ménages : leur signification - Instrument privilégié d'analyse conjoncturelle, l'enquête de l'INSEE sur les « attitudes et intentions d'achats des particuliers» cherche également à connaître l'opinion des ménages sur la situation économique française récente et future. A la lumière d'une expérience de plus de quinze années, l'auteur, rapprochant l'évolution observée des opinions émises, s'interroge sur la

Philippe lHardy

1976-01-01

5

Influence des défauts de la structure du verre sur la résistance mécanique des fibres optiques  

NASA Astrophysics Data System (ADS)

For silica (pure and doped) optical fibers prepared from preforms irradiated by thermal neutrons and Ar^+ ions, the measurements of lifetime under transverse stress were carried out. It is found that the neutron bombardment leads to decrease of the lifetime and the strength of fiber while the ion implantation results in increasing of these parameters. The influence of particle irradiation on the glass strength is explained by the generation of structural defects which were observed by the infrared an Raman spectroscopy methods. The direction of the change of mechanical properties of fibers is determined by the type of defects and their distribution in the cross-section of fiber. Des préformes de fibres optiques de silice ont été exposées à un bombardement par des faisceaux de neutrons thermiques et d'ions Ar^+ à énergie de 40 keV afin d'engendrer des défauts de la structure respectivement dans le volume ou dans la couche superficielle des échantillons. Les fibres obtenues des préformes irradiées et non irradiées ont été mises en charge de flexion. On a déterminé leur temps de rupture sous diverses contraintes de traction sur la surface extérieure de la fibre en flexion. On a observé une diminution du temps de rupture des fibres après le bombardement neutronique et une augmentation après l'implantation ionique. L'analyse de la nature des défauts en faisant appel à la spectroscopie infrarouge et Raman a fait ressortir que l'irradiation aux ions entraînait essentiellement des liaisons chimiques dans une fine couche superficielle de l'échantillon alors que l'irradiation aux neutrons occasionnait une déformation des zones du réseau silicique dans toute la section de la préforme et de la fibre. L'amélioration de la résistance mécanique s'explique par une augmentation de la mobilité des éléments structuraux de la matrice de verre par suite d'une rupture partielle des liaisons chimiques et sa diminution par l'apparition de concentrateurs supplémentaires de contraintes à l'échelle moléculaire.

Chmel, A.; Baptizmanski, V. V.; Kharshak, A. A.

1992-12-01

6

Impacts d'un programme d'interventions multidimensionnel conçu pour les parents et leur enfant ayant un TDAH sur le stress parental et la relation parent–enfant  

Microsoft Academic Search

Les difficultés comportementales associées au trouble déficitaire de l'attention\\/hyperactivité (TDAH) altèrent significativement le fonctionnement du système familial et provoquent un fort niveau de stress parental (Barkley, 2005). Cette étude examine les impacts d'un programme d'interventions multidimensionnel de groupe (Multi-Propulsions) sur le stress parental et la qualité de la relation parent–enfant. Ce programme comporte trois volets: un programme d'interventions cognitives comportementales

Martine Verreault; Claudia Verret; Line Massé; Philippe Lageix; Marie-Claude Guay

2011-01-01

7

Les cadres et leurs diplômes  

Microsoft Academic Search

[fre] Les cadres et leurs diplômes par Michel CÉZARD . A partir d'une analyse de leur répartition entre les divers groupes socio-professionnels, on constate que les 2\\/3 des diplômés possédant un niveau supérieur au baccalauréat deviennent cadres supérieurs, ceux d'entre eux qui possèdent des diplômes du niveau licence et au- dessus le deviennent presque toujours. Toutefois, alors que les hommes

Michel Cézard

1973-01-01

8

Influence du chrome et du niobium sur l'équilibre ?-? dans les aluminiures de titane  

NASA Astrophysics Data System (ADS)

L’influence du chrome et du niobium sur les transformations et équilibres de phases des aluminiures de titane dans le domaine biphasé a/g est étudiée par analyse thermique différentielle, dilatomètrie, et métallographie quantitative après traitements thermiques suivis de trempe. Les compositions et les taux de phases à l’équilibre sont déterminés pour différentes températures du domaine biphasé a/g. Les résultats sont comparés aux calculs thermodynamiques réalisés à l’aide d’une banque de données relative aux intermétalliques de base Ti-Al.

Daloz, D.; Hazotte, A.; Lacaze, J.; Charpentier, M.

2004-12-01

9

Gestion de projet et gouvernance des associations : le rôle du consensus dans leur conciliation  

Microsoft Academic Search

Initialement conçu à destination des organisations marchandes, le management de projet s'est progressivement étendu au secteur non lucratif. Cette communication cible l'articulation entre le management de projet et la gouvernance des organisations non lucratives et discute des conditions de leur conciliation. La recherche intègre deux séries de travaux ethnographiques sur le processus décisionnel et le management de projet en France

Jacqueline De Bony

2011-01-01

10

Influence du traitement ionisant par rayonnement ? sur le pouvoir antioxydant de fractions polyphénoliques issues de substances d'origine végétale  

NASA Astrophysics Data System (ADS)

Ionizing radiation of vegetables is a cleaning up and preservation physical treatment which consists in submitting them to ? radiation, X radiation or electrons beam. This study deals with the influence of ? radiation on antioxidative effect of vegetables polyphenolic parts. In that purpose, we use a simple biological test based on erythrocytes haemolysis. Le traitement ionisant des produits végétaux est un procédé physique d'assainissement et de conservation qui consiste à les soumettre à l'action de rayonnements ?, de rayons X ou de faisceaux d'électrons. Ce travail porte sur l'étude de l'influence des rayonnements ? sur le pouvoir antioxydant de fractions polyphénoliques issues de substances d'origine végétale. Pour cela, un test biologique basé sur l'hémolyse d'érythrocytes est utilisé.

Stuyck, S.; Connaulte, J.; Lesgards, G.; Prost, M.; Raffi, J.

1998-04-01

11

Influence of Carbonate Crusts on Trophic Cascades in Big Sur Streams.  

NASA Astrophysics Data System (ADS)

Top-down effects of fish predation in streams are influenced by habitat conditions and traits of intermediate consumers. Along the Big Sur coast, seasonal carbonate crusts form in many streams, and appear to alter insect communities. We conducted a small-scale field experiment in two adjacent tributaries (crusted and crust-free) to determine the effects of predation by juvenile steelhead (Oncorhynchus mykiss) on invertebrates and algae in these different stream types. We hypothesized that a trophic cascade would be more likely in the crusted stream, which was dominated by an herbivore vulnerable to steelhead predation (Baetis), than in the crust-free stream, which was dominated by a less vulnerable herbivore (Agapetus). However, excluding steelhead from paving bricks had no effect on algae or Baetis in the crusted stream. Algal abundance was low, suggesting possible bottom-up control. In the crust-free stream, steelhead predation did not affect Agapetus, but nevertheless produced a trophic cascade by causing Baetis to increase by 85%, which in turn depressed algae by 25%. These results suggest that trophic interactions may differ between crust forming and non-crust forming streams, which we plan to test with additional sampling and experiments replicated across stream types.

Rundio, D.; Lindley, S.

2005-05-01

12

Recherches sur l'expression des facteurs létaux héréditaires chez l'embryon de la drosophile  

Microsoft Academic Search

Résumé Des recherches sur les propriétés tinctoriales des éléments qui constituent l'œuf ont été exécutées. Le protoplasme est composé de noyaux, d'hyaloplasme, de petits granules et de granules vitellins. Les petits granules ont les caractéristiques suivantes: leur dimension est généralement de 0,5µ et leur forme est globuleuse. Leur forte basophilie peut être enlevée par une solution HClO4 10% en 24

Tadashi Imaizumi; Yoshikazu Kimoto

1954-01-01

13

L'INFLUENCE SUR LA REMUNERATION DES DIRIGEANTS DES LIENS HUMAINS ENTRE LES ADMINISTRATEURS DES SOCIETES COTEES : UNE ANALYSE DU RESEAU DES SOCIETES COTEES AU SBF 250  

Microsoft Academic Search

Cet article a pour objectif d'étudier la structure des liens humains entre les conseils d'administration et son influence sur la rémunération incitative du premier dirigeant. Un échantillon de 181 dirigeants des sociétés du SBF 250 entre 2002 et 2005 est retenu. Nos résultats montrent que la position du conseil dans le réseau des liens, appréhendée par la centralité de proximité,

Ali Dardour

2009-01-01

14

Influence de la cinétique chimique sur la structure des détonations : cas du bioxyde de chlore  

NASA Astrophysics Data System (ADS)

An investigation applied to small and unstable molecules has been proposed in order to establish a correlation between chemical kinetics and detonation structure. The present study illustrated by chlorine dioxide thermal decomposition consists in submitting the explosive gas to a shock wave and observing its evolution with various diagnostics. Laser schlieren measurements give a formulation of ClO2 vibrational relaxation times ?v in function of pressure, temperature and dilution. A reaction mechanism has been deduced from spectroscopic measurements and validated in a large range of initial conditions from the determination of autoignition delays ? i behind the reflected shock. An induction distance for the explosive reaction in the detonation wave, as defined in the model of Zeldovich, von Neumann and Döring, has been estimated from the autoignition delay. This induction distance ? i is compared to the mean size ? of the detonation cells, visualized by the traces left by the triple point collisions on the soot-coated tube wall. ?i is generally found to be negligible towards ? v and the ratio ?/?i to be close to 6, independently of the initial pressure. Une méthode d'étude applicable à de petites molécules très instables est proposée pour établir un lien entre la cinétique chimique et la structure des détonations. L'étude type ici décrite, réalisée avec le bioxyde de chlore, consiste à soumettre le gaz à une onde de choc et à observer son évolution par différentes techniques d'analyse. Les mesures par ombroscopie laser permettent de formuler les temps de relaxation vibrationnelle ?v de ClO2 en fonction de la pression, de la température et de la dilution. On déduit, des mesures spectroscopiques, un mécanisme réactionnel validé dans un large domaine de pression et de température par la détermination des délais d'auto-inflammation ?i derrière le choc réfléchi. A partir de ?i est estimée la distance d'induction à la réaction explosive dans l'onde de détonation, définie sur les bases du modèle de Zeldovich- von Neumann-Döring. Cette distance d'induction fictive ?i est comparée à la largeur moyenne ? des cellules de détonation visualisées sur une paroi enduite de suie par les traces de collisions de points triples. ? i est généralement négligeable devant ?v et l'on trouve que le rapport ?/?i, pratiquement indépendant de la pression initiale, est voisin de 6.

Paillard, C.; Dupré, G.; Aiteh, H. Al; Youssefi-Stitou, S.

15

Confiance, justification et controverse sur les OGM en Europe  

Microsoft Academic Search

L’apparition des plantes génétiquement modifiées, en Europe, a donné lieu à des débats importants. Cette controverse concernant les OGM apparaît comme le résultat de la confrontation entre les intérêts des différents acteurs (mouvement associatif, lobby industriel, expert et scientifique, représentant politique) organisés en groupes de pression, s’appuyant chacun sur leur propre registre de justification des bienfaits ou des inconvénients supposés

Samira Chaklatti; Damien Rousselière

2006-01-01

16

Influence de basses températures sur la croissance et la survie de souches pures de Frankia isolées de nodules d'Aulnes  

Microsoft Academic Search

L'influence des basses températures sur la croissance et la survie de cultures pures deFrankia a été étudiée. Les souches, même isolées de stations à climat froid, sont incapables de se développer à des températures constantes inférieures à 15°C. Cependant elles résistent à ces températures défavorables et sont capables de reformer des colonies dès que la température se maintient à 28°C

A. Moiroud; M. Faure-Raynaud; P. Simonet

1984-01-01

17

Influence du solvant sur la dynamique interne de la butyrylcholinestérase et sur la dynamique de l' eau d' hydratation : une étude par diffusion élastique incohérente de neutrons  

NASA Astrophysics Data System (ADS)

L'enzyme butyrylcholinestérase humaine a été étudiée par diffusion élastique incohérente de neutrons entre 20 et 285 K sous différentes conditions de solvant. La dynamique globale sur une échelle de l'Ångström et de la nanoseconde, exprimée en déplacements carrés moyens, a été déterminée dans le cadre de l'approximation Gaussienne. La comparaison d'échantillons lyophilisés de différents tampons et hydratés en H{2}O ou en D{2}O a donné les résultats suivants: 1) La dynamique globale interne de l'enzyme varie en fonction du type de sel présent dans le solvant. 2) La dynamique de l'eau d'hydratation est différente en fonction de la température et de la dynamique interne de l'enzyme.

Gabel, F.

2005-11-01

18

Influence des chlorures et des sulfures sur la corrosion des alliages inoxydables en milieu phosphorique  

Microsoft Academic Search

The corrosion resistance of stainless alloys has been studied in 40 % phosphoric acid contaminated by chlorides and\\/or sulfides. The influence of temperature and impurities on the behaviour of materials was clarified by using electrochemical techniques (polarization curves). The action of Cl? ions results in the local destruction of the passivity layer whereas the S2? ions induce an important incease

Mohamed Adil Hajji; Abdellah Guenbour; El Miloudi Jallouli; Ali Ben Bachir; Said Belcadi

2002-01-01

19

Etude en microscopie electronique·de 1'influence des reflexions accidentelles sur les tensions critiques  

Microsoft Academic Search

Study by electron microscopy of the influence of accidental reflections on critical voltagesIn this article it is shown that strongly excited non-systematic reflections have very apparent effects on the profile contrasts of extinction contours in the vicinity of a critical voltage. Our results have been obtained with wedge shaped single crystals of magnesium oxide. The effects of strong non-systematic reflections

Par R. Ayroles; A. Mazel; F. Ajustron

1973-01-01

20

Site Safety and Food Affect Movements of Semipalmated Sandpipers (Calidris pusilla) Migrating Through the Upper Bay of Fundy Effets de la sécurité du site et de la disponibilité de nourriture sur les déplacements des Bécasseaux semipalmés durant leur halte migratoire dans la partie amont de la baie de Fundy  

Microsoft Academic Search

The upper Bay of Fundy is a critical stopover site for Semipalmated Sandpipers ( Calidris pusilla) during their fall migration. However, little is known about factors that influence selection of feeding and roosting sites by these birds, or the extent to which birds move between different sites during their time in the region. Using radio-telemetry, we studied movement patterns, examined

Ashley J. Sprague; Diana J. Hamilton; Antony W. Diamond

21

Community–habitat relationships in coastal streams in Big Sur, California, USA: travertine influences macroinvertebrate abundance and community structure  

Microsoft Academic Search

Travertine deposition occurs in streams worldwide but its effects on stream communities are poorly understood. I sampled benthic\\u000a macroinvertebrates, periphyton, and reach-scale environmental variables in coastal streams in Big Sur, central California,\\u000a USA, to determine the specific effects of travertine that occurred at some sites as well as to provide a broader assessment\\u000a of community–habitat relationships. Total density and biomass

David E. Rundio

2009-01-01

22

Influences on Gold Production (Les influences s'exerçant sur la production de l'or) (Factores que influyen sobre la producción del oro)  

Microsoft Academic Search

Cet article examine à la lumière d'événementes récents les influences économiques qui s'exercent sur la production de l'or, et étudie en particulier l'effet dépressif de l'application à l'échelle internationale d'un prix fixe de vente de l'or à un moment où les autres prix sont en hausse. Cette influence semble avoir joué un rôle relativement important dans les pays producteurs d'or

Fred Hirsch

1968-01-01

23

L'activité professionnelle des mères a augmenté les chances de réussite de leurs enfants  

Microsoft Academic Search

[fre] Les femmes ayant charge d'enfant dont la mère a travaillé durant leur enfance ont eu une scolarité meilleure que celles dont la mère est restée au foyer. Elles ont interrompu moins fréquemment leur activité professionnelle à la naissance de leurs enfants. De plus, elles ont obtenu un statut socioprofessionnel plus souvent supérieur à celui de leur père. Ces constatations

Georges Menahem

1988-01-01

24

Influence des interactions du couple ciment/adjuvant dispersant sur les proprietes des betons: Importance du mode d'introduction des adjuvants  

NASA Astrophysics Data System (ADS)

Les travaux de recherche de cette these de doctorat ont porte sur les phenomenes d'incompatibilite (ou de compatibilite) ciment/adjuvant dispersant en mettant l'accent sur l'influence du mode d'introduction des adjuvants sur les proprietes des betons frais et durcis. Les aspects physiques et chimiques de l'interaction ciment/adjuvant a ete relies aux proprietes des betons en tenant compte du rapport E/C, de la teneur en C3A du ciment ainsi que du type d'adjuvant dispersant. Le programme experimental propose debute par une etude rheologique et mecanique sur pate et sur beton. Le comportement du superplastifiant a base de polynaphtalene (PNS) depend surtout de son interaction avec les premiers produits d'hydratation du ciment. Cette interaction du superplastifiant PNS avec le ciment est remarquablement differente dans le cas ou l'ajout du PNS est differe de quelques minutes. Lorsque le superplastifiant PNS est introduit directement avec l'eau de gachage, on remarque la formation d'un gel blanc compose d'ettringite, de CaCO 3 et de polynaphtalene et ce compose organo-mineral est presque inexistant lorsque le superplastifiant PNS est ajoute en mode differe. Ce gel organo-mineral se forme a partir de la solution entre les aluminates de calcium hydrates, les sulfates et le PNS, et est responsable de la perte d'affaissement du beton. Les analyses au microscope electronique a balayage montrent que l'introduction du superplastifiant PNS en mode S1 (ajout direct) engendre la precipitation d'une plus grande quantite d'ettringite et de produit organo-mineral. Cette ettringite finement cristallisee, abondante et enchevetree aura pour consequence de diminuer les proprietes rheologiques des betons et des pates. Ce phenomene ne s'observe pas lorsque le superplastifiant PNS est introduit en mode differe. Le mode d'introduction du superplastifiant a base de polyacrylate (PAE) n'affecte nullement le comportement rheologique du beton. Par ailleurs, le gel organo-mineral n'apparait pas avec le superplastifiant PAE. Le superplastifiant PNS et son adsorption n'est pas fonction de la teneur en C3A. Un resultat tres important est la concentration en calcium qui est beaucoup plus elevee avec le superplastifiant PNS, surtout avec le ciment a forte teneur en C3A. Il semble que l'hydratation des phases du ciment soit controlee par la presence du superplastifiant PAE. Les analyses au microscope electronique a balayage avec le superplastifiant a base de polyacrylate apres 60 minutes d'hydratation du ciment montre de facon tres nette que la surface des grains de ciment est denudee de tout produit d'hydratation. En ce qui concerne les reducteurs d'eau, l'ajout en mode differe produit un certain effet benefique sur la rheologie et depend aussi du dosage surtout avec le reducteur d'eau de portee moyenne a base de lignosulfonate modifie (LM). Dans tous les cas, le reducteur d'eau ordinaire CG retarde plus la prise que le reducteur d'eau de portee moyenne LM. (Abstract shortened by UMI.)

Baalbaki, Moussa

25

Synthese de Nouveaux Derives Phosphones a Chaine Perfluoree et Leurs Proprietes Adhesives Sur Acier  

Microsoft Academic Search

Ce mémoire décrit la synthèse de phosphonates comportant une chaîne perfluorée. Ces composés sont obtenus par la télomérisation d'allylphosphonates de dialkyle en présence d'un agent de transfert fluoré de type mercaptan. Ensuite, nous employons deux méthodes de déalkylation menant sélectivement soit au monoacide soit au diacide phosphonique. Tous ces produits comprenant une extrémité de chaîne phosphonée, sous forme acide ou

T. Jeanmaire; C. Brondino; Y. Hervaud; B. Boutevin

2002-01-01

26

Les migrations en Basse Casamance (Sénégal): Projet d'une recherche multidisciplinaire sur les facteurs socio-économiques favorisant la migration en Basse Casamance et sur ses conséquences pour les lieux d'origine : rapport final  

Microsoft Academic Search

Deux des limitations majeurs des études sur les migration en Afrique Noire sont leur orientation axée vers l'analyse des caractéristiques et motivations individuelles des migrants et la négligence de l'évaluation des conséquences sur les lieux de départ. Ce rapport, résultat d'une recherche menée en 1974 et 1975 par des chercheurs de l'Afrika-Studiecentrum dans quatre villages de Basse Casamance (Sénégal) vise

Jonge de K; Klei van der J; H. A. Meilink; R. Storm

1978-01-01

27

Influence d'une diffusion d'or sur l'activité recombinante des joints de grains dans le silicium  

NASA Astrophysics Data System (ADS)

We have studied by Deep Level Transient Spectroscopie (DLTS) the energy levels introduced by gold diffusion in Polix multicrystalline P type silicon. Diffusion has been carried out at 900 °C for 6 h in argon flow after a gold layer was previously deposited by cathodic sputtering on one side of the sample. Al-Si diodes have been made on the other side of the samples, on the grains and on grain boundaries. The results show that gold atoms reach the other side of the sample (400 ?m). They are in substitutional sites and give the well-known donor level in P type silicon (E_v+0.35 eV). However on the diodes which cover the grain boundaries, an additional level located at 0.43 eV above the valence band is revealed. The enhanced diffusion of gold atoms through the grains could be explained by the kick-out mechanism. In the grain boundaries the additional level might result from the formation of gold-iron or gold-defect complexes. Nous avons étudié au moyen de la technique de spectroscopie capacitive (DLTS) les niveaux d'énergie introduits par l'or dans le silicium multicristallin de type P obtenu selon le procédé Polix. Les diffusions sont réalisées à 900 °C pendant 6 h dans un tube ouvert, parcouru par un flux d'argon, après qu'une couche d'or ait été déposée sur une face des échantillons. Les résultats obtenus à partir des mesures effectuées avec des diodes Al-Si réalisées sur l'autre face et dans les grains, montrent que l'or a traversé toute l'épaisseur de l'échantillon (400 ?m) et s'est placé en site substitutionnel caractérisé par le niveau donneur à E_v+ 0,35 eV. Les analyses effectuées avec les diodes recouvrant les joints de grains font apparaître un niveau donneur supplémentaire situé à 0,43 eV de la bande de valence. La diffusin de l'or selon le mécanisme de “kick-out” permet d'interpréter les résultats obtenus dans les grains. En ce qui concerne le joint de grains, la formation de complexes Au-défaut cristallin ou bien Au-impuretés, telle que le fer, serait à l'origine du niveau situé à E_v+ 0,43 eV .

Pasquinelli, M.

1992-03-01

28

Conséquences des nouvelles formes de commande sur les matériaux de l'isolation statorique  

NASA Astrophysics Data System (ADS)

Use of inverter drive for rotating machines speed control leads to the application of new stress on stator insulation materials. The integrity of these materials under such stresses has therefore to be studied. Thanks to specially equipped motor, the different voltage shapes have been identified. Very short rise time fronts, large overvoltages and high oscillation frequencies are obtained. These voltages are then reproduced on laboratory samples (Polyethylene Terephtalate). The main result is the existence of trapped surface charges related both to the rise front value and to the existence of polar mechanisms in the material bulk. The consequences of this surface charge existence on the reliability of a real system are then discussed. L'utilisation de nouvelles formes de commande pour les machines à courant alternatif se traduit par l'apparition d'un nouveau type de contraintes sur les matériaux de l'isolation statorique. L'étude de leur comportement sous l'action de ce type de contraintes revêt un intérêt tout particulier pour la validation et la stabilité de ces systèmes dans le temps. Nous présentons, tout d'abord, ces différentes formes de tension identifiées à l'aide d'un moteur spécialement instrumenté. L'existence de fronts de tension très élevés, de surtensions importantes (jusqu'à 500V) et d'oscillations hautes fréquences (2MHz), est mise en évidence. La reproduction de ces contraintes en laboratoire sur des échantillons de polyesters (PolyÉthylène Térephthalate) permet alors de déterminer l'influence des formes de tension carrées sur les propriétés intrinsèques du matériau. Elle se traduit par l'existence d'une charge piégée en surface du diélectrique. Cette charge superficielle est associée, d'une part à l'existence de phénomènes de relaxation dans les matériaux étudiés et d'autre part à la valeur des fronts de tension appliqués. Pour finir, les conséquences possibles de l'existence de ces charges superficielles sont discutées.

Bellomo, J. P.; Lebey, Th.; Peltier, Fr.; Oraison, J. M.

1997-05-01

29

Influence du débit et de la répartition de dose sur l'incidence des cancers pulmonaires après inhalation d'émetteurs  

NASA Astrophysics Data System (ADS)

We have discussed experimental results reported on the influence of dose rate and dose distribution on the incidence of lung tumors after inhalation exposure to ? emitters. New experiments have been carried out to characterize the range of tumor risk which could vary over more than a factor 20 depending on the ? activity of the inhaled particles. Long term effects induced in rats after inhalation of poorly soluble 237NpO2 and industrial PuO2 with a similar granulometry will be compared, the specific activities of which varying within a factor 500. Nous avons rapporté les différentes données expérimentales de cancérogenèse pulmonaire qui montrent une variation du risque d'induction des tumeurs après inhalation de radionucléides émetteurs ? selon le débit et la répartition de dose. De nouvelles expérimentations ont été initiées afin de préciser ces variations qui s'étalent sur plus d'un facteur 20. Elles consistent à comparer les effets induits chez le rat après exposition à des aérosols de 237NpO2 et de PuO2 d'origine industrielle peu solubles et de granulométrie analogue dont les activités spécifiques diffèrent d'un facteur 500.

Fritsch, P.; Dudoignon, N.; Morlier, J. P.; Monchaux, G.; Morin, M.

1998-04-01

30

Influence du tabagisme et du niveau de dépendance nicotinique sur l'endurance musculaire chez des sujets entraînés  

Microsoft Academic Search

Aim. – To evaluate the influence of tobacco smoking on muscular endurance according to the degree of nicotinic dependence among trained subjects.Methods and results. – Two groups of trained male students were tested. The first group consisted of 120 smokers, and the second of 126 non-smokers. All the subjects belonged to second division of Congolese football league clubs. Degree of

B. Packa-Tchissambou; A. Massamba; J. Kissambou-Mouanou; P. Senga; M. Gbeassor

2005-01-01

31

Influence du milieu de synthèse sur la cristallisation de saponite : proposition de mécanisme réactionnel en milieux acide et basique  

Microsoft Academic Search

Influence of the synthesis medium on the saponite crystallisation: formation mechanism in acidic and basic media. The present work is relative to the hydrothermal synthesis of saponite, a clay mineral having the following chemical formula per half unit cell : MxMg3 (Si4–xAlx)O10(OH,F)2, 0.2 < x < 1.20, where M is an hydrated exchangeable cation and x is the layer charge. Syntheses were performed in

Maguy Jaber; Jocelyne Miéhé-Brendlé

2005-01-01

32

Influence de l'acoustic streaming sur la stabilité d'une couche de fluide isotherme ou chauffée latéralement  

NASA Astrophysics Data System (ADS)

The linear stability of acoustic streaming flows induced by ultrasound waves (Eckart streaming), for both isothermal and laterally heated fluids confined between two parallel horizontal infinite walls has been studied. The basic profiles were determined analytically, and the eigenvalue problem derived for the temporal stability analysis was solved by a spectral Tau Chebyshev method. In the isothermal case, a critical acoustic parameter A leading to an oscillatory instability was determined. A is minimum for an acoustic beam width (normalized by the height of the fluid layer) H=0.32 and increases when either H is decreased or increased. The other result concerns the influence of the acoustic streaming flow on the stability of the laterally heated layer (Hadley flow). For rather small beam widths, the acoustic streaming flow destabilizes the Hadley flow, but for large beam widths ( H>0.6), a range of acoustic parameter values was found for which the Hadley flow is stabilized (increase of the thresholds), before a sharp decrease of the thresholds for larger A. Let us underline that the stability of such flows has not been yet studied in the literature. To cite this article: W. Dridi et al., C. R. Mecanique 335 (2007).

Dridi, Walid; Henry, Daniel; BenHadid, Hamda

2007-03-01

33

AIDE À LA PLANIFICATION AVEC INCERTITUDE, IMPRÉCISION ET INCOMPLÉTUDE SUR LA DEMANDE  

Microsoft Academic Search

La prise en compte de la demande client pour la planification tactique dans les chaînes logistiques est un enjeu crucial pour leur bon fonctionnement. L'environnement concurrentiel actuel rend difficile l'engagement des clients sur le moyen terme. Dès lors, il est nécessaire de développer des méthodes et outils pour s'adapter au mieux à une demande fluctuante. Dans ce contexte, cet article

François Galasso; Caroline Thierry

2008-01-01

34

L'élaboration et la validation concomitante du Q-Sort sur la relation conjugale  

Microsoft Academic Search

Cette étude présente les étapes ayant mené à l'élaboration du Q-Sort sur la relation conjugale (Q-RC). Le QRC est composé de 100 énoncés constituant une description spécifique d'un aspect d'une relation conjugale entre un homme et une femme. Le Q-RC requiert des conjoints qu'ils se placent dans une position d'observateur par rapport à leur relation conjugale et qu'ils décrivent, à

Carl Lacharité; Peter J. LaFrenière; Marc Bigras

1991-01-01

35

Contraintes en matière d'éducation pour la santé des écoliers et de leurs parents  

Microsoft Academic Search

Résumé Les contraintes en matière d'éducation pour la santé des écoliers et de leurs parents sont analysées et discutées. Celles qui sont rencontrées le plus fréquemment sont d'ordre économique, éthique, psychologique, politique, institutionnel, éducationnel et sociologique.

R.-L. Mounoud

1981-01-01

36

Les grandes banques allemandes et leurs activités dans l'Europe occidentale occupée, 1940-1944  

Microsoft Academic Search

[fre] Résumé . Les grandes banques allemandes ont développé leurs activités pendant la Seconde Guerre mondiale dans pratiquement tous les pays occupés ou annexés. En Europe occidentale, leurs stratégies étaient différentes de celles poursuivies à l'Est. La Deutsche Bank, la Dresdner Bank et la Commerz-bank y ont privilégié une large collaboration avec les banques nationales. Ce n'est que dans les

Johannes Bähr

2005-01-01

37

Conception et developpement d'un environnement d'apprentissage sur les transformations d'energies et leurs rendements  

NASA Astrophysics Data System (ADS)

The energy sector is at the heart of the concerns technological, political and economic modern society. This area requires a basic understanding of the scientific concept of energy. It is our opinion essential to any citizen training. We initially, from theoretical and practical considerations, examined why this area is so important in our technological society is so little discussed in the Quebec curriculum? Why do we merely a theoretical and discursive concept? Why, contrary to all scientific education, have we not considered learning situations in the laboratory for the study of energy? In a second step, we proposed an idea of practical and realistic solution to address all these questions. A solution that invites students to engage constructively in laboratory activities to appropriate these concepts. To do this, we have developed global variables energies that allowed students to experiment and measure energy transformations easily. This quest for technological development in education is therefore to take advantage of new technological developments in computing and microelectronics to design, build and test a computerized environment learning laboratory for science and technology. With this energy is at the confluence of three domains, this environment has been designed to support the same activity in the learning of mathematics, science and technology. This integration recommended by the new programs we believe is essential to the understanding of concepts related to energy and its transformations. For this learning activity multidisciplinary, we want, via an empirical and practical address these issues of energy transformations in order to give students the ability to develop the prototypes they build technology to improve their performance. We have shown that this approach techno, similar to the design of an experimental design in science, promotes understanding of concepts related to energy and their transformations. This educational development, open to scientific investigation, provides educational benefit, not only for practicing teachers and student teachers, but also for students from the fifth year of high school, we have shown in a setting tested empirically. Keywords: energy, energy transformation, energy efficiency, research development, ExAO, didactic, laboratory, experimentation.

Boutros, Wissam

38

Les effets des interfaces sur les proprietes magnetiques et de transport des multicouches nickel/iron et cobalt/silver  

NASA Astrophysics Data System (ADS)

Cette these est consacree a l'etude de l'evolution structurale des proprietes magnetiques et de transport des multicouches Ni/Fe et nanostructures a base de Co et de l'Ag. Dans une premiere partie, essentiellement bibliographique, nous introduisons quelques concepts de base relies aux proprietes magnetiques et de transport des multicouches metalliques. Ensuite, nous presentons une breve description des methodes d'analyse des resultats. La deuxieme partie est consacree a l'etude des proprietes magnetiques et de transport des multicouches ferromagnetiques/ferromagnetiques Ni/Fe. Nous montrerons qu'une interpretation coherente de ces proprietes necessite la prise en consideration des effets des interfaces. Nous nous attacherons a mettre en evidence, a evaluer et a etudier les effets de ces interfaces ainsi que leur evolution, et ce, suite a des traitements thermiques tel que le depot a temperature elevee et l'irradiation ionique. Les analyses correlees de la structure et de la magnetoresistance nous permettront d'emettre des conclusions sur l'influence des couches tampons entre l'interface et le substrat ainsi qu'entre les couches elles-memes sur le comportement magnetique des couches F/F. La troisieme partie est consacree aux systemes a Magneto-Resistance Geante (MRG) a base de Co et Ag. Nous allons etudier l'evolution de la microstructure suite a l'irradiation avec des ions Si+ ayant une energie de 1 MeV, ainsi que les effets de ces changements sur le comportement magnetique. Cette partie debutera par l'analyse des proprietes d'une multicouche hybride, intermediaire entre les multicouches et les materiaux granulaires. Nous analyserons a l'aide des mesures de diffraction, de relaxation superparamagnetique et de magnetoresistance, les evolutions structurales produites par l'irradiation ionique. Nous etablirons des modeles qui nous aideront a interpreter les resultats pour une serie des multicouches qui couvrent un large eventail de differents comportements magnetiques et ceci en fonction de l'epaisseur de la couche magnetique de Co. Nous verrons que dans ces systemes les effets de l'irradiation ionique sont fortement influences par l'energie de surface ainsi que par l'enthalpie de formation, largement positive pour le systeme Co/Ag.

Veres, Teodor

39

Formation et transformation de défauts ponctuels par insolation UV dans les diélectriques à base de silice: application à l'intégration de composants optiques sur fibre  

Microsoft Academic Search

La présence dans les verres germanosilicates de défauts ponctuels résultants de défauts de liaisons interatomiques ou de stoechiométrie peut être à l'origine d'une modification photoinduite sous insolation UV de leur indice de réfraction. Cette modification est mise à profit pour induire une modulation périodique ou variable de l'indice permettant la réalisation de composants optiques intégrés sur fibre: filtres, miroirs, compensateurs

A. Boukenter; F. Goutaland; H. Kuswanto; E. Marin; J. P. Meunier; Y. Ouerdane

2003-01-01

40

Localization of sulphonylurea receptor proteins SUR2A and SUR2B and/or SUR1 in rat kidney.  

PubMed

To further explore precise expression and localization of sulphonylurea receptor isoforms SUR2A and SUR2B (SUR1) in rat kidney, total RNA was isolated from the kidney tissue using the TRIzol kit. Three different primer sets designed against SUR isoforms were used in reverse transcriptase reactions. Western blotting was done on membrane fractions obtained from kidney tissues using the primary antisera for SUR2A and SUR2B (SUR1). Paraformaldehyde fixed kidney sections were immunostained with SUR2A and SUR2B (SUR1) primary antisera. Sections were developed with DAB as a chromogen. RT-PCR results demonstrated mRNA consistent with SUR1 isoform to be the only identifiable transcript. Western blotting could not identify any protein consistent with SUR2A or SUR2B (SUR1) but recognized instead a smaller 55kD protein of unknown identity. Immunohistochemistry demonstrated a differential staining pattern whereby SUR2A was localized to the mesangial cells, intra- and extrarenal blood vessels and smooth muscles. In contrast, SUR2B (SUR1) was localized only to distal nephron epithelia. Intense immunoreactivity was localized to the thick ascending limb and as well as in the outer and inner medullary collecting ducts, both. Our results demonstrate differential and highly localized expression pattern of sulphonylurea receptor proteins SUR2A and 2B (SUR1) in rat kidney with implications for drug design. PMID:24035941

Qureshi, Irfan Z; Beesley, Alex H; White, Stanley J

2013-09-01

41

Influence du débit et de la répartition de dose sur l'incidence des cancers pulmonaires après inhalation d'émetteurs  

Microsoft Academic Search

We have discussed experimental results reported on the influence of dose rate and dose distribution on the incidence of lung tumors after inhalation exposure to alpha emitters. New experiments have been carried out to characterize the range of tumor risk which could vary over more than a factor 20 depending on the alpha activity of the inhaled particles. Long term

P. Fritsch; N. Dudoignon; J. P. Morlier; G. Monchaux; M. Morin

1998-01-01

42

Influence du peuplement forestier sur la faune et la microflore du sol et des humus. II. Microbologie et expériences au laboratoire  

Microsoft Academic Search

Cet article suit un article précédemment paru dans le dernier fascicule de cette revue, qui concernait la description des sites et la présentation des principaux résultats relatifs à la faune du sol. Cette étude a été accomplie dans le cadre du projet PIREN-CNRS «Influence des monocultures de résineux et alternatives possibles». Trois stations permanentes ont été étudiées: un peuplement de

P. Arpin; J. F. David; G. G. Guittonneau; G. Kilbertus; J. F. Ponge; G. Vannier

1986-01-01

43

Influence de l'Orientation de la Vitesse du Vent sur la Dispersion d'un Polluant autour d'un Bâtiment  

Microsoft Academic Search

The present numerical study concentrates on the dispersion of a pollutant constituted by a mixture of sulfur - dioxide (SO2) and air in turbulent regime around a two -dimensional obstacle. We treat mainly the influence of t he wind velocity orientation on the dynamic and thermal characteristics of the plume, as well as the pollutant concentration around an obstacle. A

N. Mahjoub Said; H. Mhiri; S. El Golli; G. Le Palec

44

Le d?fi de la recherche sur les m?dicaments et du traitement des enfants au Canada  

PubMed Central

RÉSUMÉ Les enfants ont toujours été des « orphelins thérapeutiques ». De nombreux médicaments n’ont pas fait l’objet d’études auprès des enfants et des adolescents ou leur utilisation n’est pas autorisée officiellement auprès d’eux, ce qui crée un défi constant en matière d’élaboration et de définition de pharmacothérapies à la sécurité et l’efficacité optimales au sein du groupe d’âge pédiatrique. Depuis dix ans, des réseaux ont germé aux États-Unis et en Europe afin d’accroître la recherche sur les médicaments dans ce groupe, mais aucune évolution comparable ne s’observe au Canada. Le présent document de principes expose le contexte de la situation canadienne et contient des recommandations qui tiennent compte de deux besoins pressants : plus de recherches sur les médicaments axées sur les enfants et les adolescents canadiens, y compris un financement dédié à de telles recherches, et plus d’effectifs pour mener des études ciblées. Ces initiatives devraient être entreprises en collaboration, sur les scènes nationale et internationale, et inclure des démarches stratégiques et novatrices afin de régler les problèmes et enjeux éthiques uniques que présente la recherche sur les médicaments au sein de cette population.

Rieder, Michael J

2011-01-01

45

Les mouvements de l'ecorce terrestre et leur observation geodesique  

Microsoft Academic Search

Conclusion  Les exemples cités dans cet article et étudiés en Tchécoslovaquie montrent que sur la terre entière, se produisent des mouvements\\u000a de l'écorce terrestre, horizontaux et verticaux, positifs et négatifs. En même temps on peut constater que ce sont les régions\\u000a de tectonique jeune qui subissent ces mouvements et qu'ils s'y manifestent beaucoup plus intensivement (système slovaco—carpathien)\\u000a que sur les masses

Karel Svoboda

1937-01-01

46

Photoluminescence de microcavités organiques à base d'oligomères de phénylène vinylène et mise en évidence de l'influence de la structure de la cavité sur l'émission de l'Alq3  

NASA Astrophysics Data System (ADS)

Thermal ageing effect on the highly conducting CSA-PANI was investigated by measurements of the thermal dependence of the conductivity and by X-ray studies of the structure. The non-aged sample shows a metallic-like conductivity around room temperature (RT) and activated behavior dominates the low temperatures. With ageing, the metallic character at RT vanishes, whereas 16 Les effets du vieillissement thermique sur les films PANI-CSA ont été étudiés sur la conductivité et la structure cristallographique. Avec le vieillissement, le maximum de conductivité se déplace vers les hautes températures et le comportement quasi-métallique disparaît. Cependant une fraction cristalline de 16 préliminaire des résultats est effectuée avec un modèle simple dans lequel la résistivité se compose d'un terme métallique et d'un terme de hopping en série.

Berthelot, L.; Masenelli, B.; Garrigues, M.; Joseph, J.; Tardy, J.

1998-06-01

47

Quels sont les éléments essentiels de la recherche valable? Les problèmes de « données » et leur cueillette dans les contextes interculturels  

Microsoft Academic Search

La professeure Judith Bernhard enseigne à la School of Early Childhood Education de l’Université Ryerson. Elle s’appuie sur sa propre expérience de la recherche sur les familles transnationales pour illustrer les difficultés de la collecte de données et pour alimenter ainsi la réflexion sur les pratiques dans ce domaine. Elle commence par exposer sa propre histoire d’immigrante et d’universitaire. Elle

Judith K Bernhard

2010-01-01

48

La classification des personnes selon leur comportement concernant l'assurance d'un transport ecologique  

Microsoft Academic Search

La recherche réalisée a pour but, d'une part d'identifier les groupes des pèlerins conscients, respectivement indifférents, concernant un transport écologique et civilisé dans un espace étroit, à l'occasion des événements comme le pèlerinage à Iasi, Lourdes, Rome, et d'autre part de souligner les facteurs qui contribuent à la compréhension et la sensibilisation de la population sur l'importance de réduire la

Elisabeta Jaba; Elena Daniela Viorica; Christiana Brigitte Balan

2006-01-01

49

Les reseaux de politique publique comme facteur d'influence du choix des instruments de politique energetique canadienne a des fins environnementales de 1993 a nos jours  

NASA Astrophysics Data System (ADS)

Au cours de la derniere decennie, les modes de la gouvernance ont pris place dans un contexte totalement different de celui qu'ils avaient auparavant. Les gouvernements modernes se rendent compte qu'ils perdent de plus en plus leur capacite a elaborer et a gerer les changements d'une maniere autonome. Ainsi, les fonctions et les activites traditionnellement accomplies exclusivement par le gouvernement engagent de nos jours une gamme d'acteurs etatiques et non etatiques. A l'encontre du concept traditionnel de l'Etat controleur, la gouvernance contemporaine est ainsi devenue moins une question d'offre de service et davantage une gestion indirecte des reseaux de politique publique. Dans cette entreprise, les gouvernements contemporains, cherchant plus d'information, de soutien et de legitimite en matiere de formulation des decisions, ont besoin d'etablir des relations avec les divers groupes d'interet qui, a leur tour, voulaient plus de promotion et de protection en faveur de leurs interets a travers leur implication au processus de l'elaboration et de la mise en oeuvre des politiques publiques. Ainsi, l'approche des reseaux de politique publique represente aujourd'hui un courant considerable au sein du champ d'analyse des politiques publiques. Toutefois, les preoccupations des chercheurs pour cette approche, dans le domaine des politiques energetiques a des fins environnementales, semblent recentes, et les etudes realisees sont encore trop peu nombreuses. Au Canada, au debut des annees 1990, le gouvernement ainsi que plusieurs groupes d'interets, des differents secteurs energetique, industriel et environnemental, ont commence a intensifier leurs efforts pour s'attaquer au probleme du changement climatique d'origine energetique, genere surtout par le secteur de l'industrie. Au cours de la derniere decennie, la question touchant plutot le sujet du developpement energetique durable represente le plus important domaine des politiques publiques ayant surgi recemment dans l'agenda politique du pays. Notre projet de recherche, par le truchement de l'approche des reseaux de politique publique, s'attarde a decrire et a expliquer le processus de la formulation d'une politique particuliere, soit la politique energetique a des fins de protection de l'environnement, elaboree en 1993. Il s'agit de mettre en evidence les facteurs affectant le choix des instruments de ces politiques publiques dans leur contexte national. Ainsi, la question generale de cette recherche est: Comment les phases evolutives de la formation d'un reseau de politique, en l'occurrence le Conseil canadien de l'energie (CCE), menent a des caracteristiques particulieres a ce reseau; et comment celles-ci determinent-elles les types des instruments de politique publique choisis, particulierement ceux de la recente orientation des politiques energetiques canadiennes a des fins environnementales elaborees en 1993? Afin d'atteindre l'objectif de notre recherche, deux facteurs primordiaux sont utilises, soit la circulation de l'information et l'exercice du controle sur les ressources des acteurs. L'analyse des caracteristiques du reseau en fonction des liens forts et des liens faibles autant que la presence ou l'absence des trous structuraux nous permettent de bien identifier les positions des differents acteurs, etatiques et non etatiques, sur le plan de l'information et du controle, qui a leur tour, nous semble-t-il, constituent des facteurs affectant les types des instruments des politiques publiques choisis: instruments substantifs, qui indiquent le degre de l'intervention du gouvernement, et instruments proceduraux, qui mettent plutot l'accent sur le degre de l'influence du gouvernement sur les acteurs non etatiques. L'etude soutient que l'approche des reseaux se distingue notamment par son potentiel a expliquer l'interrelation relative entre idees, interets et institutions, ce qui a son tour est susceptible de permettre une meilleure comprehension des processus de l'elaboration des politiques energetiques et environnementales canadiennes. Qui plus est, le fait de rec

Fathy El Dessouky, Naglaa

50

Modelisations des effets de surface sur les jets horizontaux subsoniques d'hydrogene et de methane  

NASA Astrophysics Data System (ADS)

Le developpement des codes et de normes bases sur une methodologie scientifique requiert la capacite de predire l'etendue inflammable de deversements gazeux d'hydrogene sous differentes conditions. Des etudes anterieures ont deja etabli des modeles bases sur les lois de conservation de la mecanique des fluides basees sur des correlations experimentales qui permettent de predire la decroissance de la concentration et de la vitesse d'un gaz le long de l'axe d'un jet libre vertical. Cette etude s'interesse aux effets de proximite a une surface horizontale parallele sur un jet turbulent. Nous nous interessons a son impact sur l'etendue du champ de la concentration et sur l'enveloppe inflammable en particulier. Cette etude est comparative : l'hydrogene est compare au methane. Ceci permet de degager l'influence des effets de difference de la densite sur le comportement du jet, et de comparer le comportement de l'hydrogene aux correlations experimentales, qui ont ete essentiellement etablies pour le methane. Un modele decrivant l'evolution spatio-temporelle du champ de concentration du gaz dilue est propose, base sur la mecanique des fluides computationnelle. Cette approche permet de varier systematiquement les conditions aux frontieres (proximite du jet a la surface, par exemple) et de connaitre en detail les proprietes de l'ecoulement. Le modele est implemente dans le code de simulations par volumes finis de FLUENT. Les resultats des simulations sont compares avec les lois de similitudes decoulant de la theorie des jets d'ecoulements turbulents libres ainsi qu'avec les resultats experimentaux disponibles. L'effet de la difference des masses molaires des constituantes du jet et des constituantes du milieu de dispersion est egalement etudie dans le contexte du comportement d'echelle de la region developpee du jet.

Gomez, Luis Fernando

51

Redescription de trois espèces de Calyptrobothrium Monticelli, 1893 (Tetraphyllidea: Phyllobothriidae) parasites de Torpedo marmorata et T. nobiliana (Elasmobranchii: Torpedinidae). Remarques sur leur spécificité parasitaire et sur la position taxonomique des espèces auparavant attribuées à C. riggii Monticelli, 1893  

Microsoft Academic Search

A study of the cestodes from the intestinal parasites of torpedinid elasmobranchs off the coast of Algeria, revealed the presence, in Torpedo marmorata Risso, of a species of Calyp- trobothrium Monticelli, 1893, which we believe is identical to C. riggii Monticelli, 1893. This species, which has not been re-examined since its original description, is redescribed. We consider that the cestode

Fadila Tazerouti; Louis Euzet; Nadia Kechemir-Issad

2007-01-01

52

Qualit? des certificats de coups et blessures volontaires sur adultes ? Dakar et Diourbel, S?n?gal  

PubMed Central

Introduction Le certificat médical est une attestation écrite, destinée à constater un fait d'ordre médical. L'intérêt de cette étude résultait de la fréquence du contentieux entre représentants de la loi et médecins à propos des certificats médicaux descriptifs de coups et blessures volontaires. Les objectifs étaient d’étudier les critères d’établissement des certificats médicaux dans les cas de coups et blessures volontaires, d’évaluer la qualité des certificats médicaux dans les procédures judiciaires dans les régions de Dakar et de Diourbel, d'apprécier l’évaluation de l'Incapacité Totale de Travail fixée par les médecins et leurs implications judiciaires. Méthodes Nous avons étudié 201 certificats descriptifs de constatation de coups et blessures volontaires. L'incapacité totale de travail (ITT) au sens pénal a été revue par un médecin légiste. Les données recueillies ont été saisies et analysées par logiciel Epi Data version 3.1 et Epi Info 6.04. Résultats Le nom et les prénoms du médecin étaient mentionnés sur les 201 certificats. Sur les 201 certificats étudiés, 170 mentionnaient les faits rapportés par la victime. En proposant de manière comparative pour chacune des ITT fixées par le médecin, une ITT pénale, nous trouvions des erreurs entre ITT pénale et ITT civile (dans 95% des cas). Conclusion Les certificats médicaux délivrés sont incomplets. Les recommandations concernent la création d'unités médico-judiciaires et de centres d'accueil des victimes d'agression.

Soumah, Mohamed Maniboliot; Ngwa, Hugues Elie Elame; Ndiaye, Mor; Sow, Mamadou Lamine

2011-01-01

53

Pockmarks off Big Sur, California  

USGS Publications Warehouse

A pockmark field was discovered during EM-300 multi-beam bathymetric surveys on the lower continental slope off the Big Sur coast of California. The field contains ??? 1500 pockmarks which are between 130 and 260 m in diameter, and typically are 8-12 m deep located within a 560 km2 area. To investigate the origin of these features, piston cores were collected from both the interior and the flanks of the pockmarks, and remotely operated vehicle observation (ROV) video and sampling transects were conducted which passed through 19 of the pockmarks. The water column within and above the pockmarks was sampled for methane concentration. Piston cores and ROV collected push cores show that the pockmark field is composed of monotonous fine silts and clays and the cores within the pockmarks are indistinguishable from those outside the pockmarks. No evidence for either sediment winnowing or diagenetic alteration suggestive of fluid venting was obtained. 14C measurements of the organic carbon in the sediments indicate continuous sedimentation throughout the time resolution of the radiocarbon technique ( ??? 45000 yr BP), with a sedimentation rate of ??? 10 cm per 1000 yr both within and between the pockmarks. Concentrations of methane, dissolved inorganic carbon, sulfate, chloride, and ammonium in pore water extracted from within the cores are generally similar in composition to seawater and show little change with depth, suggesting low biogeochemical activity. These pore water chemical gradients indicate that neither significant accumulations of gas are likely to exist in the shallow subsurface ( ??? 100 m) nor is active fluid advection occurring within the sampled sediments. Taken together the data indicate that these pockmarks are more than 45000 yr old, are presently inactive, and contain no indications of earlier fluid or gas venting events. ?? 2002 Elsevier Science B.V. All rights reserved.

Paull, C.; Ussler, III, W.; Maher, N.; Greene, H. G.; Rehder, G.; Lorenson, T.; Lee, H.

2002-01-01

54

Observation des influences du changement du couvert forestier sur le comportement hydrologique de grands bassins versants tropicaux a l'aide de la teledetection numerique: Cas du bassin versant de Dong Nai, Viet Nam  

NASA Astrophysics Data System (ADS)

Monitoring hydrological behavior of a large tropical watershed following a forest cover variation has an important role in water resource management planning as well as for forest sustainable management. Traditional methods in forest hydrology studies are Experimental watersheds, Upstream-downstream, Experimental plots, Statistical regional analysis and Watershed simulation. Those methodes have limitations for large watersheds concerning the monitoring time, the lack of input data especially about forest cover and the capacity of extrapolating results accurately in terms of large watersheds. Moreover, there is still currently a scientific debate in forest ecology on relation between water and forest. The reason of this problem comes from geographical differences in publication concerning study zones, experimental watershed size and applied methods. It gives differences in the conclusions on the influence of tropical forest cover change on the changes of outlet water and yet on the yearly runoff in terms of large watershed. In order to exceed the limitations of actual methods, to solve the difficulty of acquiring forest cover data and to have a better understanding of the relation between tropical forest cover change and hydrological behavior evolution of a large watershed, it is necessary to develop a new approach by using numeric remote sensing. We used the watershed of Dong Nai as a case study. Results show that a fusion between TM and ETM+ Landsat image series and hydro-meteorologic data allow us to observe and detect flooding trends and flooding peaks after an intensive forest cover change from 16% to 20%. Flooding frequency and flooding peaks have clearly decreased when there is an increase of the forest cover from 1983 to 1990. The influence of tropical forest cover on the hydrological behavior is varying with geographical locations of watershed. There is a significant relation between forest cover evolution and environmental facteurs as the runoff coefficient (R = 0,87) and the yearly precipitation (R = 0,93).

Pham, Trinh Hung

55

Sources et impacts potentiels des micropolluants chimiques sur un écosystème littoral exploité: l'exemple des côtes des Charente-Maritime  

NASA Astrophysics Data System (ADS)

Le littoral picto-charentais est une zone à fortes activités économiques liées à l'aquaculture, à la pêche et au tourisme. Toutes ces activités demandent une très bonne qualité des eaux et de l'environnement en général. Or, cette zone littorale est soumise à de nombreux apports de micropolluants: métaux lourds, phytosanitaires, hydrocarbures, organochlorés.... Les sources en sont nombreuses: apports fluviatiles et atmosphériques, rejets diffus et rejets directs. Les risques dus à cette pollution sont multiples que ce soit au niveau dcs organismes, au niveau des écosystèmes ou des consommateurs. De ce fait, les contaminants majeurs (métaux lourds, organochlorés. hydrocarbures aromatiques polycycliques) et leurs impacts éventuels sur les écosystèmes font l'objet de veille environnementale (réseaux de surveillance ou d'observatoires de l'environnement) et de mesures de prévention se traduisant par la définition de normes de rejets ou de contamination décidées à l'échelle européenne.

Miramand, P.; Guyot, T.; Pigeot, J.

2003-06-01

56

Les jeunes: Leurs créations et leurs contraintes  

NASA Astrophysics Data System (ADS)

Young people are very often confined to a form of `participation' tailored for them by the adult section of society. This article deals with the situation of youth who are constantly caught up between their creativity potential and official rhetoric about youth, the nightmarish spectre of `the crisis', and the inability of adults to create for themselves an identity and to question the mechanisms of division and exclusion set up by societies in order to protect themselves. Despite these constraints, often structured in a very subtle way, young people are discovering in international life, in existing educational institutions, in work and in the cultural sphere alternative forms of action, communication and solidarity which are able to respond or to provide solutions to the problems of society.

Gelpi, Ettore

1985-12-01

57

``Astrophysique sur Mesure'', E-learning in Astronomy and Astrophysics  

NASA Astrophysics Data System (ADS)

``Astrophysique sur Mesure'' (astrophysics made-to-measure) is a set of e-learning programmes started 4 years ago at the Paris Observatory. In order to deliver attractive and efficient programmes, we have added many multimedia tools to usual lectures: animations, Java applets. The programmes are presented on two different platforms. The first one offers the content of all the lectures in free access. A second platform with restricted access is provided to registered students taking part in the e-learning program and benefiting from the help of tutors. The development of these programs helps to increase the sphere of influence of astronomy taught at the Paris Observatory, hence to increase the presence of astronomy in various degree courses. Instead of teaching classical astronomy lectures to a happy few, we can bring astronomy and astrophysics to a wider audience.

Mosser, Benoît; Delsanti, Audrey; Guillaume, Damien; Balança, Christian; Balkowski, Chantal

2011-06-01

58

Oscillations of membrane potential and cytosolic Ca 2+ concentration in SUR1 ?\\/? beta cells  

Microsoft Academic Search

Aims\\/hypothesis  SUR1(ABCC8)–\\/– mice lacking functional KATP channels are an appropriate model to test the significance of KATP channels in beta-cell function. We examined how this gene deletion interferes with stimulus-secretion coupling. We tested the influence of metabolic inhibition and galanin, whose mode of action is controversial.Methods  Plasma membrane potential (Vm) and currents were measured with microelectrodes or the patch-clamp technique; cytosolic Ca2+

M. Düfer; D. Haspel; P. Krippeit-Drews; L. Aguilar-Bryan; J. Bryan; G. Drews

2004-01-01

59

Regard sur les lazarets en terre canadienne  

PubMed Central

Puisant dans les nombreuses références qu’offrent les publications médicales canadiennes du milieu du XIXe siècle à nos jours, l’auteur fait découvrir l’existence de lazarets en terre canadienne, décrit l’impact de la maladie sur les conditions vie des lépreux qui y étaient confinés et en souligne les contrecoups tant sur le plan physique et psychologique que social. Il présente un bref aperçu de la maladie, ses symptômes, ses signes ainsi que ses complications oculaires et rappelle les premiers moyens thérapeutiques à base d’huile de chaulmoogra introduits dans la colonie de Tracadie vers 1901. Il illustre son propos en évoquant la vie dans les lazarets de l’île de Sheldrake (1844–1848) et de Tracadie (1848–1965) au Nouveau-Brunswick, puis dans ceux des îles D’Arcy (1891–1924) et de Bentinck (1924–1957) en Colombie-Britannique.

Milot, Jean

2008-01-01

60

L'effet de p53 sur la radiosensibilité des cellules humaines normales et cancéreuses  

NASA Astrophysics Data System (ADS)

The radiosensitivity of normal human fibroblasts in p53 dependent and associated with the loss of cells from the cycling population as the result of an irreversible G1 arrest; cells lacking normal p53 function show no arrest and are more radioresistant. Under conditions in which the repair potentially lethal radiation damage is facilitated, the fraction of cells arrested in G1 is reduced and survival is enhanced. The response of human tumor cells differs significantly. The radiation-induced G1 arrest is minimal or absent in p53+ tumor cells, and loss of normal p53 function has no consistent effect on their radiosensitivity. These results suggest that p53 status may not be a useful predictive marker for the response of human solid tumors to radiation therapy. La radiosensibilité des fibroblastes diploïdes humains est liée à l'expression de p53, et à la perte de cellules en cycle résultant d'un arrêt irréversible en phase G1 ; dans les cellules n'ayant pas une fonction p53 normale, on ne constate aucun arrêt, et elles sont plus radio-résistantes. Dans des conditions favorables à la réparation de lésions potentiellement léthales dues à l'irradiation, la proportion de cellules bloquées en phase G1 baisse, et les chances de survie sont accrues. Bien différente est la réaction des cellules cancéreuses humaines. Le blocage par irradiation en phase G1 est minime ou inexistant dans les cellules cancéreuses p53^+, et la perte de la fonction normale p53 n'a pas d'effet constant sur leur radiosensibilité. Ces résultats laissent penser que l'expression de p53 n'est pas un indice fiable permettant de prévoir la réaction des tumeurs solides à la radiothérapie.

Little, J. B.; Li, C. Y.; Nagasawa, H.; Huang, H.

1998-04-01

61

Rapport sur l'état du patrimoine astronomique dans les observatoires français de la fin du XIXè siècle  

NASA Astrophysics Data System (ADS)

Suite au colloque sur la sauvegarde du patrimoine astronomique organisé par le MAEE et la SAF, sous l'égide de l'UNESCO, qui a conduit à l'adoption de la Déclaration de Paris, les directeurs d'observatoires institutionnels qui étaient absents du colloque ont ressenti le besoin de discuter de ces conclusions prises en leur nom. L'initiative d'organiser une réunion des directeurs des Observatoires des Sciences de l'Univers (OSU) à ce sujet le 30 janvier 2012 a été prise par François Vernotte, directeur de l'Observatoire de Besançon. Le présent compte-rendu de visite résulte d'une initiative spontanée d'Emmanuel Pécontal, astronome responsable du Patrimoine à l'observatoire de Lyon, et d'Evelyne Damm, membre de la Commission Nationale de classement des Monuments Historiques (CNMH) et élue à la communauté d'agglomération des Portes de l'Essonne oû est sis l'observatoire de Camille Flammarion.

Damm, E.; Pécontal, E.

2012-12-01

62

Promoter DNA Methylation Regulates Murine SUR1 (Abcc8) and SUR2 (Abcc9) Expression in HL-1 Cardiomyocytes  

PubMed Central

Two mammalian genes encode the SURx (SUR1, Abcc8 and SUR2, Abcc9) subunits that combine with Kir6.2 (Kcnj11) subunits to form the ATP-sensitive potassium (KATP) channel in cardiac myocytes. Different isoform combinations endow the channel with distinct physiological and pharmacological properties, and we have recently reported that the molecular composition of sarcolemmal KATP channels is chamber specific in the mouse heart. KATP channel composition is determined by what subunits are expressed in a cell or tissue. In the present study, we explore the role of CpG methylation in regulating SUR1 and SUR2 expression. In HL-1 cardiomyocytes, as in atrial myocytes, SUR1 expression is markedly greater than SUR2. Consistent with CpG methylation-dependent silencing of SUR2 expression, bisulfite sequencing of genomic DNA isolated from HL-1 cells demonstrates that 57.6% of the CpGs in the promoter region of the SUR2 gene are methylated, compared with 0.14% of the the CpG residues in the SUR1 sequence. Moreover, treatment with 10 µM 5-aza-2?-deoxycytidine (Aza-dC) significantly increased both the unmethylated fraction of the SUR2 CpG island and mRNA expression. However, we cannot rule out additional mechanisms of Aza-dC action, as Aza-dC also causes a decrease in SUR1 expression and lower doses of Aza-dC do not alter the unmethylated DNA fraction but do elicit a small increase in SUR2 expression. The conclusion that DNA methylation alone is not the only regulator of SUR subunit expression is also consistent with observations in native myocytes, where the CpG islands of both SUR genes are essentially unmethylated in both atrial and ventricular myocytes. Collectively, these data demonstrate the potential for CpG methylation to regulate SURx subunit expression and raises the possibility that regulated or aberrant CpG methylation might play a role in controlling channel structure and function under different physiological conditions or different species.

Fatima, Naheed; Schooley, James F.; Claycomb, Willliam C.; Flagg, Thomas P.

2012-01-01

63

Promoter DNA methylation regulates murine SUR1 (Abcc8) and SUR2 (Abcc9) expression in HL-1 cardiomyocytes.  

PubMed

Two mammalian genes encode the SURx (SUR1, Abcc8 and SUR2, Abcc9) subunits that combine with Kir6.2 (Kcnj11) subunits to form the ATP-sensitive potassium (KATP) channel in cardiac myocytes. Different isoform combinations endow the channel with distinct physiological and pharmacological properties, and we have recently reported that the molecular composition of sarcolemmal KATP channels is chamber specific in the mouse heart. KATP channel composition is determined by what subunits are expressed in a cell or tissue. In the present study, we explore the role of CpG methylation in regulating SUR1 and SUR2 expression. In HL-1 cardiomyocytes, as in atrial myocytes, SUR1 expression is markedly greater than SUR2. Consistent with CpG methylation-dependent silencing of SUR2 expression, bisulfite sequencing of genomic DNA isolated from HL-1 cells demonstrates that 57.6% of the CpGs in the promoter region of the SUR2 gene are methylated, compared with 0.14% of the the CpG residues in the SUR1 sequence. Moreover, treatment with 10 µM 5-aza-2'-deoxycytidine (Aza-dC) significantly increased both the unmethylated fraction of the SUR2 CpG island and mRNA expression. However, we cannot rule out additional mechanisms of Aza-dC action, as Aza-dC also causes a decrease in SUR1 expression and lower doses of Aza-dC do not alter the unmethylated DNA fraction but do elicit a small increase in SUR2 expression. The conclusion that DNA methylation alone is not the only regulator of SUR subunit expression is also consistent with observations in native myocytes, where the CpG islands of both SUR genes are essentially unmethylated in both atrial and ventricular myocytes. Collectively, these data demonstrate the potential for CpG methylation to regulate SURx subunit expression and raises the possibility that regulated or aberrant CpG methylation might play a role in controlling channel structure and function under different physiological conditions or different species. PMID:22844491

Fatima, Naheed; Schooley, James F; Claycomb, Willliam C; Flagg, Thomas P

2012-07-23

64

Influence de la Recrystallisation et de la Mise en Solution sur la Tenacite des Alliages 7010 et 7475. Fatigue Oligocyclique de l'Alliage 7010 (Influence of Recrystallization and Solution on the Tenacity of the 7010 and 7475 Alloys. Olygocyclic Fatigue of the 7010 Alloy).  

National Technical Information Service (NTIS)

The influence on aluminum alloys of high temperature heat treatments having a solution effect was studied. The volume fraction of undissolved components such as Mg2, Si, Al7Cu2 and Fe is clearly diminished giving a higher hardening potential. In the case ...

G. Lapasset J. L. Raviart

1983-01-01

65

Pliocene–Pleistocene rocky shorelines trace coastal development of Bah??a Concepción, gulf coast of Baja California Sur (Mexico)  

Microsoft Academic Search

Pliocene rocky-shore deposits on the east coast of Baja California Sur (Mexico) formed under the influence of tectonic events and changing relative sea level in the Gulf of California. Depositional patterns are represented by two distinct styles of marine transgression. Level-bedded deposits in semi-enclosed basins form steep buttress unconformities similar in profile to basin fill detected through seismic stratigraphy. Such

M. E. Johnson; J. Ledesma-Vázquez

2001-01-01

66

Plexus splanchniques: Conceptions actuelles sur les activités ganglionnaires et médullo-surrénales  

Microsoft Academic Search

Résumé 1.Cet exposé est surtout basé sur des recherches personnelles réalisées à l'aide de technique de «plexus solaire» et de «surrénale» vogués in situ.2.Les expériences rapportées poursuivies sous une forme analytique dans des conditions pourtant aussi physiologiques que possible, permettent de préciser diverses données sur la transmission synaptique ganglionnaire sur les relais disposés sur les voies vasomotrices splanchniques, sur l'action

J. Malméjac

1957-01-01

67

Réglementation de la FDA sur les cellules et tissus humains  

Center for Biologics Evaluation and Research (CBER)

Text Version... appliquant ainsi une approche étagée et basée sur le risque, il est possible d'éviter une manipulation ou une transformation impropre susceptible ... More results from www.fda.gov/downloads/biologicsbloodvaccines/internationalactivities

68

Point de vue réglementaire sur le développement des vaccins ...  

Center for Biologics Evaluation and Research (CBER)

Text Version... et des centres universitaires sur le développement clinique et l'homologation des produits, notamment les vaccins contre le paludisme, le VIH et la ... More results from www.fda.gov/downloads/biologicsbloodvaccines/internationalactivities

69

The big sur ecoregion sudden oak death adaptive management ...  

Treesearch

Description: The Big Sur area is one of the most ecologically diverse regions in California. ... This information was the basis for a model built to randomly generate the ... In the plots, comprehensive data on the environment, vegetation, forest ...

70

Effets du titane et du niobium sur l'oxydation à 950circC d'aciers ferritiques  

NASA Astrophysics Data System (ADS)

Nous avons étudié l'effet du titane et du niobium sur l'oxydation à 950circC d'un acier Fe-Cr chrominoformeur. La DRX in situ montre que le titane semble s'oxyder en formant Cr{2}TiO{5} et TiO{2} qui contribuent à une augmentation de la prise de masse des échantillons. Une partie du titane issu de ces oxydes semble doper la couche de chromine. Sa présence augmente la concentration en lacunes cationiques dans la chromine et augmente donc la diffusion du chrome dans la couche. Nous avons aussi montré que le niobium n'a pas d'influence sur l'oxydation de ce type d'acier à 950circC.

Issartel, C.; Buscail, H.; Caudron, E.; Cueff, R.; Riffard, F.; El Messki, S.; Karimi, N.; Antoni, L.

2004-11-01

71

Projection par plasma de depots de dioxyde de titane: Contribution a l'etude de leurs microstructures et proprietes electriques  

NASA Astrophysics Data System (ADS)

The aim of this PhD work is, thanks to particle parameters (velocity and temperature) characterization, to try to understand the influence of plasma spray parameters on titania coating microstructures and the influence of the latter one on their electrical resistivity, for the same substrate conditions. The experimental approach has consisted in using two plasma spraying processes (Arc plasma spraying and Inductive plasma spraying) which have permitted to obtain a broad range of particle velocities and temperatures leading to coatings with specific microstructures. Despite the stoichiometry of the starting powder, all coatings obtained were grey, the oxygen loss increasing with the particle temperature. Isolating the stoichiometry influence has permitted to show that the decrease of the coatings electrical resistivity is especially due to the decrease of the number of bad interlamellar contacts.

Branland, Nadege

2002-04-01

72

Les stratégies d'attachement, leur transmission et le fonctionnement familial d'adolescentes anorexiques mentales  

Microsoft Academic Search

Bowlby's attachment theory emphasizes the importance of early child-environment interactions in order to develop “internal working models”, secure or insecure, which will influence future relationships with caregivers, peers and other members of the environment. Many factors are involved in the development of eating disorders, and for some authors anorexia nervosa may also be considered as a form of psychological regulation.

S. Delannes; C. Doyen; S. Cook-Darzens; M.-C. Mouren

2006-01-01

73

Que signifie pour vous la nouvelle loi sur la sécurité sanitaire ...  

Center for Food Safety and Applied Nutrition (CFSAN)

... Axe sur la science et les risques : la loi établit des normes basées sur des informations scientifiques pour la production et la récolte salubres de ... More results from www.fda.gov/food/guidanceregulation/fsma

74

Effets de L'anisotropie Cristalline et DU Desordre Controle Sur les Proprietes Optiques et Phononiques des Composes Semiconducteurs ZIRCONIUM(1-X) Hafnium(x) SOUFRE(3)  

NASA Astrophysics Data System (ADS)

Dans ce travail, nous presentons l'etude de l'effet de l'anisotropie cristalline et du desordre substitutionnel controle sur les proprietes electroniques et vibrationnelles des composes semiconducteurs Zr_{rm 1-x}Hf_{x} S_3. Les proprietes phononiques sont ete etudiees en spectroscopie Raman. Les mesures systematiques des spectres polarises de tous les composes nous ont permis d'identifier tous les phonons predits par la theorie des groupes et de suivre l'evolution de leur frequence avec la concentration de hafnium. L'analyse plus approfondie par un procede de lissage des spectres nous a permis detudier l'effet du desordre controle sur la largeur des modes phononiques. Les resultats de cette analyse ont ete confrontes aux predictions d'un modele developpe pour une chai ne diatomique desordonnee et ameliore suite a nos observations experimentales. La forme en cloche predite par ce dernier pour la variation de la largeur du mode optique de la chai ne est observee pour trois phonons de symetrie Bg. L'accord est excellent pour X > 0.5 pour deux des trois modes et ce, sans aucun parametre ajustable. Cette etude nous a permis, d'une part, de conclure que les modes Bg se comportent comme s'ils etaient sur une chai ne isolee et que, par consequent, les deux chai nes composant la cellule unite de nos cristaux sont tres faiblement liees et, d'autre part, de confirmer la symetrie des modes telle que deduite des spectres polarises. Les proprietes electroniques du ZrS_3 ont ete etudiees par des mesures polarisees du coefficient d'absorption pres de son gap indirect. L'evolution des spectres avec la temperature nous a permis d'identifier deux gaps paralleles differents et un gap perpendiculaire confirmant ainsi le modele de la structure de bande base sur les etats electroniques moleculaires de l'ion (S _2)^2. L'analyse detaillee des differentes structures du coefficient d'absorption indique clairement un caractere bidimensionnel du gap indirect. L'effet du desordre substitutionnel sur la structure de bande ainsi deduite pour ZrS_3 a ete etudie par des mesures de photoluminescence sur tous les composes. Un modele de l'intensite de la recombinaison radiative d'excitons localises dans les etats d'une queue de bande dans le gap des semiconducteurs decrit bien les raies observees dans les spectres des differents composes. Un procede de lissage nous a permis, d'une part, d'identifier deux polytypes du ZrS_3 correspondant aux deux variantes A et B de la structure cristallographique des composes MX_3 et, d'autre part, de deduire la variation avec la composition de l'energie des gaps parallele et perpendiculaire des deux polytypes.

Ait-Ouali, Abderrahmane

75

Modelisations des effets de surface sur les jets horizontaux subsoniques d'hydrogene et de methane  

Microsoft Academic Search

Le developpement des codes et de normes bases sur une methodologie scientifique requiert la capacite de predire l'etendue inflammable de deversements gazeux d'hydrogene sous differentes conditions. Des etudes anterieures ont deja etabli des modeles bases sur les lois de conservation de la mecanique des fluides basees sur des correlations experimentales qui permettent de predire la decroissance de la concentration et

Luis Fernando Gomez

2010-01-01

76

Sur l’autofocalisation des ondes a symétrie de révolution  

Microsoft Academic Search

\\u000a Sommaire  Les ondes à symétrie de révolution présentent un grand intérêt pour les télécommunications parce qu’il est facile de leur\\u000a constituer des filtres de mode. Cela reste vrai en optique. Mais ces ondes présentent un intérêt plus grand encore lorsqu’on\\u000a veut concentrer l’énergie par auto-focalisation. Lorsqu’elles sont très puissantes, elles rejettent à la périphérie du faisceau\\u000a les électrons, où ils forment

Pierre Marié

1974-01-01

77

Influence du stratum corneum sur la perspiration insensible et sur la biodisponibilité d’un nouveau stéroïde topique, le difluprednate  

Microsoft Academic Search

Comparative study of experimental and theoretical curves obtained by plotting transepidermal water loss against stratum corneum thickness in man, shows that every layer in the stratum corneum acts as part of the epidermal barrier to water loss. Another function of the stratum corneum is to decrease the cutaneous penetration of topical corticosteroids like difluprednate and to modify their bioavailability (‘corticosteroid

C. Lafille; A. Barbier; J. Girard

1979-01-01

78

Influence des sels mineraux sur l'adsorption des acides humiques sur flocs d'hydroxydes de fer preformes  

Microsoft Academic Search

The purpose of this study is to quantify the effect of sodium, potassium, calcium, magnesium salts (Chloride, sulphate, mono and dihydrogenphosphate) on the adsorptive capacity of preformed hydroxide metallic (Fe) flocs for humic substances (HS) and humic acids (HA) at differents experimental conditions (table 1). The addition of calcium ions shows an increase of adsorption capacity of HS and HA

M. T. Wais Mossa; M. Mazet

1991-01-01

79

Sur les Conditions d'Auto-Oscillation des Systèmes Vibrants  

Microsoft Academic Search

Le professeur Rocard a rassemblé en une doctrine plus compréhensible les conditions dans lesquelles les systèmes vibrants peuvent devenir auto-oscillants. On a depuis longtemps des moyens mathématiques très bien adaptés pour déterminer ces conditions. Il restait à les analyser et à en comprendre la nature. On peut sur quelques exemples voir la complexité du sujet; l'auteur cite le roulement des

Yves Rocard

1948-01-01

80

Sur Lago area, Venezuela: Three dimensional integrated seismic interpretation  

Microsoft Academic Search

In 1988, 550 square km of 3D seismic data were acquired in the Sur Del Lago area. The aims of the survey were (1) To better define structures already identified from the existing 1 [times] 1 km 2D seismic grid at the level of potential Cretaceous limestone reservoirs and (2) To further study the prospectivity of potential structural and stratigraphic

A. Growcott; A. McIan; R. Ramirez

1993-01-01

81

Coastal Management at Ojo De Liebre, Baja California Sur  

Microsoft Academic Search

We analyzed the biotic, abiotic, and human components interacting at the coastal zone of the Ojo de Liebre Lagoon, Baja California Sur, Mexico. Using geographic information systems, satellite images, and the main biological, physical, and socioeconomic compo- nents, we developed an environmental characterization of the zone. According with the natural features of the zone, including the water- shed characteristics, the

Federico Salinas-Zavalal; Alfredo Ortega-Rubiol; Diego Valdez-Zamudiol; Aradit Castellanos-Vera

82

Tetrameric structure of SUR2B revealed by electron microscopy of oriented single particles  

PubMed Central

The ATP-sensitive potassium (KATP) channel is a hetero-octameric complex that links cell metabolism to membrane electrical activity in many cells, thereby controlling physiological functions such as insulin release, muscle contraction and neuronal activity. It consists of four pore-forming Kir6.2 and four regulatory sulfonylurea receptor (SUR) subunits. SUR2B serves as the regulatory subunit in smooth muscle and some neurones. An integrative approach, combining electron microscopy and homology modelling, has been used to obtain information on the structure of this large (megadalton) membrane protein complex. Single-particle electron microscopy of purified SUR2B tethered to a lipid monolayer revealed that it assembles as a tetramer of four SUR2B subunits surrounding a central hole. In the absence of an X-ray structure, a homology model for SUR2B based on the X-ray structure of the related ABC transporter Sav1866 was used to fit the experimental images. The model indicates that the central hole can readily accommodate the transmembrane domains of the Kir tetramer, suggests a location for the first transmembrane domains of SUR2B (which are absent in Sav1866) and suggests the relative orientation of the SUR and Kir6.2 subunits. Structured digital abstract SUR2B and SUR2B bind by electron microscopy (View interaction) SUR2B and SUR2B bind by molecular sieving (View interaction)

Fotinou, Constantina; Aittoniemi, Jussi; Wet, Heidi; Polidori, Ange; Pucci, Bernard; Sansom, Mark S P; Venien-Bryan, Catherine; Ashcroft, Frances M

2013-01-01

83

The Sulfonylurea Receptor 1 (Sur1)-Transient Receptor Potential Melastatin 4 (Trpm4) Channel*  

PubMed Central

The sulfonylurea receptor 1 (Sur1)-NCCa-ATP channel plays a central role in necrotic cell death in central nervous system (CNS) injury, including ischemic stroke, and traumatic brain and spinal cord injury. Here, we show that Sur1-NCCa-ATP channels are formed by co-assembly of Sur1 and transient receptor potential melastatin 4 (Trpm4). Co-expression of Sur1 and Trpm4 yielded Sur1-Trpm4 heteromers, as shown in experiments with Förster resonance energy transfer (FRET) and co-immunoprecipitation. Co-expression of Sur1 and Trpm4 also yielded functional Sur1-Trpm4 channels with biophysical properties of Trpm4 and pharmacological properties of Sur1. Co-assembly with Sur1 doubled the affinity of Trpm4 for calmodulin and doubled its sensitivity to intracellular calcium. Experiments with FRET and co-immunoprecipitation showed de novo appearance of Sur1-Trpm4 heteromers after spinal cord injury in rats. Our findings depart from the long-held view of an exclusive association between Sur1 and KATP channels and reveal an unexpected molecular partnership with far-ranging implications for CNS injury.

Woo, Seung Kyoon; Kwon, Min Seong; Ivanov, Alexander; Gerzanich, Volodymyr; Simard, J. Marc

2013-01-01

84

Episodic coronary artery vasospasm and hypertension develop in the absence of Sur2 KATP channels  

PubMed Central

KATP channels couple the intracellular energy state to membrane excitability and regulate a wide array of biologic activities. KATP channels contain a pore-forming inwardly rectifying potassium channel and a sulfonylurea receptor regulatory subunit (SUR1 or SUR2). To clarify the role of KATP channels in vascular smooth muscle, we studied Sur2 gene-targeted mice (Sur2–/–) and found significantly elevated resting blood pressures and sudden death. Using in vivo monitoring, we detected transient, repeated episodes of coronary artery vasospasm in Sur2–/– mice. Focal narrowings in the coronary arteries were present in Sur2–/– mice consistent with vascular spasm. We treated Sur2–/– mice with a calcium channel antagonist and successfully reduced vasospastic episodes.

Chutkow, William A.; Pu, Jielin; Wheeler, Matthew T.; Wada, Tomoyuki; Makielski, Jonathan C.; Burant, Charles F.; McNally, Elizabeth M.

2002-01-01

85

Effets de l'interaction avec l'oxygène sur le comportement de couches semi-conductrices de ZnO, SnO{2} et CdSe  

NASA Astrophysics Data System (ADS)

Les propriétés superficielles des matériaux solides diffèrent de celles du volume. A la surface, des défauts de différentes natures peuvent être présents. Ils permettent à la surface d'être interactive avec le milieu ambiant. Les multiples interactions entre les états de surface et des éléments du milieu extérieur peuvent modifier les propriétés superficielles. Ce travail étudie la régénération de couches semi-conductrices après adsorption isotherme d'oxygène à différentes températures effectuées entre 20 ° C et 300 ° C. Les matériaux qui ont servi à l'étude sont des couches de ZnO, SnO{2} et CdSe. Celles de CdSe ont été obtenues par co-évaporation, sous vide, de cadmium et de sélénium. Les échantillons de ZnO et SnO{2} ont été élaborés par oxydation, à des températures respectives de 450 ° C et 200 ° , de Zn et Sn déposés par électrolyse et par évaporation sous vide. Les matériaux évaporés ont été déposés sur des plaquettes en verre, les autres ont été électrodéposés sur des substrats métalliques. Les variations des propriétés électriques des couches ont été suivies par mesure de leur résistance électrique superficielle R. Les courbes LogR = f (103 /T (K)), relevées sous vide à différentes températures, sont caractéristiques d'un comportement de semi-conducteur. Des essais d'adsorption d'O{2} à différentes températures montrent des variations considérables de R. En effet, la chimisorption forte d'un gaz par une surface semi-conductrice est telle que l'échange électronique entre adsorbant et adsorbat provoque la formation d'une zone de charge d'espace modifiant la conduction superficielle. Les résultats mettent en évidence des domaines de température de plus haute sensibilité à l'oxygène. Pour le CdSe, certaines désorptions isothermes ont été suffisantes pour une régénération totale des échantillons. Les couches de ZnO ont souvent nécessité des désorptions programmées en température (D.P.T.), pour leur restauration à l'état initial, après ionosorption d'O{2}. L'exploitation des courbes de variation de R en cours de D.P.T. permet de déterminer les énergies mises en jeu. Les résultats prouvent que les réactions des états de surface avec l'oxygène sont multiénergétiques. La réactivité de ces couches vis à vis de cet élément dépend fortement de leurs conditions d'élaboration. Ainsi, ces échantillons pourraient servir à la détection de gaz réducteurs d'O{2} qui s'adsorberait par réduction de l'oxygène ionosorbé, et provoquerait un effet inverse sur la conduction, telle qu'une augmentation de la conductivité superficielle ou une diminution de la résistance d'un matériau semi-conducteur de type n. Ces variations sont importantes lorsque la concentration d'oxygène ionosorbé est grande, donc dans les domaines de température de plus haute sensibilité à l'oxygène. Ce mécanisme serait révélateur de la présence d'un gaz réducteur dans l'atmosphère et la surface d'un semi-conducteur pourrait servir d'élément sensible d'un détecteur de gaz.

Ain-Souya, A.; Ghers, M.; Haddad, A.; Tebib, W.; Rehamnia, R.; Messsalhi, A.; Bounouala, M.; Djouama, M. C.

2005-05-01

86

Etude des effets du martelage repetitif sur les contraintes residuelles  

NASA Astrophysics Data System (ADS)

L'assemblage par soudage peut engendrer des contraintes residuelles. Ces contraintes provoquent des fissurations prematurees et un raccourcissement de la duree de vie des composants. Dans ce contexte, le martelage robotise est utilise pour relaxer ces contraintes residuelles. Trois volets sont presentes: le premier est l'evaluation des effets des impacts unitaires repetes sur le champ de contraintes developpe dans des plaques d'acier inoxydable austenitique 304L vierges ou contenant des contraintes residuelles initiales. Dans la deuxieme partie de ce projet, le martelage est applique grace au robot SCOMPI. Les contraintes residuelles induites et relaxees par martelage sont ensuite mesurees par la methode des contours, qui a ete adaptee a cet effet. Dans la troisieme partie, le martelage est modelise par la methode des elements finis. Un modele axisymetrique developpe grace au logiciel ANSYS permet de simuler des impacts repetes d'un marteau elastique sur une plaque ayant un comportement elastoplastique.

Hacini, Lyes

87

Franchise sur les soins ambulatoires et équité sociale  

Microsoft Academic Search

[fre] Franchise sur les soins ambulatoires et équité sociale . Approche par microsimulation d'une voie de responsabilisation possible des usagers du système de soins . L'objectif de maîtrise des dépenses de santé s'est davantage attaché depuis les années 90 à la régulation de l'offre qu'à celle de la demande, en maintenant inchangés le niveau et la structure de la participation

Claire Lachaud-Fiume; Lise Rochaix-Ranson; Christine Largeron-Leténo

1998-01-01

88

Renewable energy powered desalination in Baja California Sur, Mexico  

Microsoft Academic Search

Baja California Sur (BCS) is an arid sparsely populated coastal state in northwest Mexico. Population growth, agriculture and booming tourism have lead to severe overexploitation of underground aquifers and saline intrusion. This paper reviews the current water and energy situation in BCS. The state enjoys very high levels of solar radiation, typically above 5 kWh\\/m2\\/day, and the suitability of renewable

Alfredo Bermudez-Contreras; Murray Thomson; David G. Infield

2008-01-01

89

Le Débat sur les Retraites : Capitalisation contre Répartition  

Microsoft Academic Search

[fre] Confrontée à un vieillissement marqué de sa population, la France doit continuer à ajuster son système de retraite. Compte-tenu de l'importance des enjeux, on ne peut qu'être surpris de l'absence de véritable débat public sur les orientations envisageables, ainsi que par une certaine méconnaissance des expériences étrangères. Cet article évalue les forces et faiblesses des solutions généralement proposées. Maintenir

Olivier Davanne; Thierry Pujol

1997-01-01

90

Effets in vitro des dermaseptines sur les caractéristiques du sperme  

Microsoft Academic Search

Resume  Au cours de ce travail et dans le cadre stratégique du développement des molécules multiactives et plurifonctionnelles, nous\\u000a nous sommes proposés de tester pour la première fois les dermaseptines (DS), peptides de vertébrés biologiquement actifs,\\u000a en tant que spermicide.\\u000a \\u000a Nous avons étudiéin vitro l’activité de ces nouvelles structures peptidiques, sur la mobilité et la viabilité des spermatozoïdes humains et avons

Mounir Ajina; Amira Zairi; Soumaya Mougou; Samira Ibalaa; Radhouène Naiefer; Ghaya Merdassi; Mariem Mehdi; Khaled El Heni; Ali Saad

2005-01-01

91

EPAC inhibition of SUR1 receptor increases glutamate release and seizure vulnerability.  

PubMed

EPAC (Exchange Proteins Activated by cAMP) regulates glutamate transmitter release in the central neurons, but a role underlying this regulation has yet to be identified. Here we show that EPAC binds directly to the intracellular loop of an ATP-sensitive potassium (KATP) channel type-1 sulfonylurea receptor (SUR1) receptor consisting of amino acids 859-881 (SUR1(859-881)). Ablation of EPAC or expression of SUR1(859-881), which intercepts EPAC-SUR1 binding, increases the open probability of KATP channels consisting of the Kir6.1 subunit and SUR1. Opening of KATP channels inhibits glutamate release and reduces seizure vulnerability in adult mice. Therefore, EPAC interaction with SUR1 controls seizure susceptibility and possibly acts via regulation of glutamate release. PMID:23678128

Zhao, Kunpeng; Wen, Ruojian; Wang, Xiaoxi; Pei, Lei; Yang, Ying; Shang, You; Bazan, Nicolas; Zhu, Ling-Qiang; Tian, Qing; Lu, Youming

2013-05-15

92

La violence sur les r?seaux canadiens de t?l?vision  

PubMed Central

La question des effets de la violence à la télévision occupe une place très importante dans l’opinion publique depuis les vingt dernières années, et des centaines d’études y ont été consacrées. Plusieurs chercheurs concluent à une influence négative de cette violence sur le comportement. Le public, les diffuseurs et les autorités politiques ont tous endossé l’idée de réduire la quantité totale de violence présentée au petit écran – en particulier dans les émissions accessibles aux enfants. Nous avons analysé un millier d’émissions de fiction présentées entre 1993 et 2001 sur les principaux réseaux généralistes de télévision au Canada : TVA et TQS ainsi que CTV et Global pour les réseaux privés français et anglais, ainsi que Radio-Canada français et anglais pour les réseaux publics. La méthodologie utilisée est l’analyse de contenu classique, où l’acte de violence constitue l’unité d’analyse. Les données recueillies démontrent que la quantité de violence a augmenté régulièrement depuis 1993, malgré la volonté affirmée des télédiffuseurs de présenter une programmation moins violente. C’est le cas du nombre brut d’actes et du nombre d’actes à l’heure, qui est lui aussi en forte croissance. Les réseaux privés véhiculent trois fois plus de violence que les réseaux publics. On constate également qu’une très forte proportion d’actes de violence figure dans des émissions qui commencent avant 21 h, et que de nombreux enfants y sont probablement exposés. Nous signalons finalement la place de plus en plus importante occupée par la violence psychologique.

Paquette, Guy

2003-01-01

93

Contributions of Weather and Predation to Reduced Breeding Success in a Threatened Northern Loggerhead Shrike Population Influence du climat et de la prédation sur le faible succès de reproduction d'une population de Pie-grièche migratrice nordique et menacée  

Microsoft Academic Search

Populations on the periphery of a species' range may experience more severe environmental conditions relative to populations closer to the core of the range. As a consequence, peripheral populations may have lower reproductive success or survival, which may affect their persistence. In this study, we examined the influence of environmental conditions on breeding biology and nest survival in a threatened

Douglas M. Collister; Scott Wilson

2007-01-01

94

Les Nanotechnologies : leurs bénéfices et leurs risques potentiels  

Microsoft Academic Search

This report is an introduction to the nanotechnology uprising fields. In the first section, different definitions of the nanotechnology term are given. Then, the various applications known to date and expected in the near future will be gathered according to the three most important fields of the nanotechnologies. The economic aspect will be treated in the third part before tackling

Dina Feigenbaum; Albert Nsamirizi; Bernard Sinclair-Desgagné

2004-01-01

95

STUDIA: Un Système Tutoriel Intelligent coopératif fondé sur la négociation et sur un modèle dynamique de dialogue  

Microsoft Academic Search

STUDIA est un STI dans le domaine des techniques statistiques, destiné à des étudiants et utilisé dans le cadre d'un enseignement à l'Université de Paris-Nanterre. Ce système repose sur la mise en uvre d'un modèle de dialogue structuré de façon hiérarchique autour de négociations ayant trait à l'acquisition des connaissances. Pour mener à bien ces négociations, des stratégies coopératives sont

Robert Chevallier

1992-01-01

96

Insights into the function and structural flexibility of the periplasmic molecular chaperone SurA.  

PubMed

SurA is the primary periplasmic molecular chaperone that facilitates the folding and assembling of outer membrane proteins (OMPs) in Gram-negative bacteria. Deletion of the surA gene in Escherichia coli leads to a decrease in outer membrane density and an increase in bacterial drug susceptibility. Here, we conducted mutational studies on SurA to identify residues that are critical for function. One mutant, SurA(V37G), significantly reduced the activity of SurA. Further characterization indicated that SurA(V37G) was structurally similar to, but less stable than, the wild-type protein. The loss of activity in SurA(V37G) could be restored through the introduction of a pair of Cys residues and the subsequent formation of a disulfide bond. Inspired by this success, we created three additional SurA constructs, each containing a disulfide bond at different regions of the protein between two rigid secondary structural elements. The formation of disulfide bond in these mutants has no observable detrimental effect on protein activity, indicating that SurA does not undergo large-scale conformational change while performing its function. PMID:23275244

Zhong, Meng; Ferrell, Brent; Lu, Wei; Chai, Qian; Wei, Yinan

2012-12-28

97

Utilisation de traceurs radioactifs pour l'évaluation du recrutement des leucocytes et des échanges vasculaires au niveau d'organes in~vivo. Description d'une méthode et discussion des problèmes d'interprétation sur quelques exemples  

NASA Astrophysics Data System (ADS)

An experimental method using simultaneously different ? emiter tracers was developed to evaluate inflammation in vivo. Experiments were performed on the anaesthetized guinea-pig to test pulmonary effects of inflammatory agents. Red blood cells, albumin and inflammatory cells (platelets or leucocytes) radiolabelled with 99m technetium, 131 iodine and 111 indium respectively were injected i.v. Their radioactivities were measured on a pulmonary region by external detection and on blood samples in a well type counter. From these measurements variations of the lung contents in red blood cells, extravascular albumin and non circulating leucocytes during inflammatory stimulation were evaluated. These parameters axe indexes of blood perfusion, vascular exchanges and leucocyte sequestration respectively. Fiability of the method and meaning of the parameters evaluated are discussed. Une méthode expérimentale utilisant simultanément différents traceurs ? a été développée pour évaluer l'inflammation in vivo. Des expériences ont été réalisées chez le cobaye anesthésié pour tester l'effet pulmonaire d'agents inflammatoires. Des globules rouges, de l'albumine et des cellules inflammatoires (plaquettes ou leucocytes) radiomarqués respectivement au technetium 99m, à l'iode 131 et à l'indium 111 sont injectés i.v. Leurs radioactivités sont mesurées sur une région pulmonaire par détection externe et sur des échantillons sanguins au compteur puit. À partir de ces mesures sont évaluées les variations des contenus pulmonaires en globules rouges, en albumine extravasculaire et en leucocytes non circulants lors d'une stimulation inflammatoire. Ces paramètres sont corrélés aux modifications de la perfusion, des échanges vasculaires et de la séquestration leucocytaire. La fiabilité de la méthode et la signification des paramètres évalués sont discutées.

Bureau, M. F.

1997-03-01

98

Developpement et validation d'un outil base sur l'acoustique geometrique pour le diagnostic du bruit de nacelle  

NASA Astrophysics Data System (ADS)

De nos jours, la problématique du bruit généré par les avions est devenue un point de développement important dans le domaine de l'aéronautique. C'est ainsi que de nombreuses études sont faites dans le domaine et une première approche consiste à modéliser de façon numérique ce bruit de manière à réduire de façon conséquente les coûts lors de la conception. C'est dans ce contexte qu'un motoriste a demandé à l'université de Sherbrooke, et plus particulièrement au groupe d'acoustique de l'Université de Sherbrooke (GAUS), de développer un outil de calcul de la propagation des ondes acoustiques dans les nacelles mais aussi pour l'étude des effets d'installation. Cet outil de prédiction leur permet de réaliser des études afin d'optimiser les traitements acoustiques (« liners »), la géométrie de ces nacelles pour des études portant sur l'intérieur de la nacelle et des études de positionnement des moteurs et de design pour les effets d'installation. L'objectif de ce projet de maîtrise était donc de poursuivre le travail réalisé par [gousset, 2011] sur l'utilisation d'une méthode de lancer de rayons pour l'étude des effets d'installation des moteurs d'avion. L'amélioration du code, sa rapidité, sa fiabilité et sa généralité étaient les objectifs principaux. Le code peut être utilisé avec des traitements acoustiques de surfaces («liners») et peut prendre en compte le phénomène de la diffraction par les arêtes et enfin peut être utilisé pour réaliser des études dans des environnements complexes tels que les nacelles d'avion. Le code développé fonctionne en 3D et procéde en 3 étapes : (1) Calcul des faisceaux initiaux (division d'une sphère, demi-sphère, maillage des surfaces de la géométrie) (2) Propagation des faisceaux dans l'environnement d'étude : calcul de toutes les caractéristiques des rayons convergents (amplitude, phase, nombre de réflexions, ...) (3) Reconstruction du champ de pression en un ou plusieurs points de l'espace à partir de rayons convergents (sommation des contributions de chaque rayon) : sommation cohérente. Le code (GA3DP) permet de prendre en compte les traitements de surface des parois, la directivité de la source, l'atténuation atmosphérique et la diffraction d'ordre 1. Le code a été validé en utilisant différentes méthodes telles que la méthode des sources-images, la méthode d'analyse modale ou encore la méthode des éléments finis de frontière. Un module Matlab a été créé spécialement pour l'étude des effets d'installation et intégré au code existant chez Pratt & Whitney Canada. Mots-clés : Acoustique géométrique - Ray-Tracing - Lancer de faisceaux - Diffraction - Sommation Cohérente - Niveau de Pression.

Minard, Benoit

99

Monitoring the Topography and Substrate of the Big Sur River after the Basin Complex Fire  

Microsoft Academic Search

Abstract ,Wildfires are naturally occurring in Big Sur because of its Mediterranean eco- systems which consist of fire prone plants such as chaparral. Over the summer of 2008, lightning struck Big Sur igniting the Basin Complex Fire burning most of the Monterey Range District of the Los Padres National Forest. This study focuses on fire-related excess sediment and how it

Mary Zertuche

100

Diffraction de rayons X sur les plaquettes de fer durcies par cyanuration  

NASA Astrophysics Data System (ADS)

Une méthode de cyanuration a été developpée pour les surfaces des plaquettes de fer, basée sur une réaction thermochimique qui conduit à la formation des couches dures sur le métal. Les échantillons ont été analysés, pour de temps différents de traitement, par diffraction de rayons X et par mesures de dureté.

Popescu, M.; Hoyer, W.; Stegarescu, M.; Cornet, A.; Broll, N.

2004-11-01

101

Endothelial SUR-8 Acts in an ERK-Independent Pathway During Atrioventricular Cushion Development  

PubMed Central

SUR-8, a conserved leucine-rich repeats protein, was first identified as a positive regulator of Ras pathway in Caenorhabditis elegans. Biochemical studies indicated that SUR-8 interacts with Ras and Raf, leading to the elevated ERK activity. However, the physiological role of SUR-8 during mammalian development remains unclear. Here we found that germline deletion of SUR-8 in mice resulted in early embryonic lethality. Inactivated SUR-8 specifically in mouse endothelial cells (ECs) revealed that SUR-8 is essential for embryonic heart development. SUR-8 deficiency in ECs resulted in late embryonic lethality, and the mutant mice displayed multiple cardiac defects. The reduced endothelial-mesenchymal transformation (EMT) and the reduced mesenchyme proliferation phase were observed in the atrioventricular canal (AVC) within the mutant hearts, leading to the formation of hypoplastic endocardial cushions. However, ERK activation did not appear to be affected in mutant ECs, suggesting that SUR-8 may act in an ERK-independent pathway to regulate AVC development. Developmental Dynamics 239:2005–2013, 2010 © 2010 Wiley-Liss, Inc.

Yi, Jing; Chen, Muyun; Wu, Xiaohui; Yang, Xiao; Xu, Tian; Zhuang, Yuan; Han, Min; Xu, Rener

2010-01-01

102

IMPACT DE LA QUALITE DU RESULTAT COMPTABLE SUR LE COUT DES FONDS PROPRES DES ENTREPRISES TUNISIENNES  

Microsoft Academic Search

En se basant sur le modèle de Fama et French (1993), nous avons essayé de mesurer l'impact de la qualité du résultat comptable sur le coût des fonds propres des entreprises tunisiennes. La revue de la littérature nous renseigne que plus la qualité de l'information – véhiculée par le résultat comptable – est meilleure, moins sera le risque informationnel, ce

Fatma Triki; Rym Hachana

2008-01-01

103

Genre et valorisation des compétences sur les marchés du travail en Europe  

Microsoft Academic Search

Étudier le début de carrière des jeunes diplômés, femmes et hommes, sur les différents marchés du travail européens peut permettre de mieux saisir les évolutions récentes dans chaque pays et des tendances communes au niveau européen. Notre démarche repose sur l'enquête REFLEX (Research into Employment and Professional Flexibility) réalisée auprès de 40 000 jeunes cinq ans après la fin de

Jean-François Giret; Christine Guégnard; Jean-Jacques Paul

2008-01-01

104

46 CFR 7.130 - Point Conception, CA to Point Sur, CA.  

Code of Federal Regulations, 2010 CFR

...Shipping 1 2010-10-01 2010-10-01 false Point Conception, CA to Point Sur, CA. 7.130 Section 7.130 Shipping...PUBLIC BOUNDARY LINES Pacific Coast § 7.130 Point Conception, CA to Point Sur, CA. (a) A line drawn from the...

2010-10-01

105

46 CFR 7.130 - Point Conception, CA to Point Sur, CA.  

Code of Federal Regulations, 2010 CFR

...Shipping 1 2008-10-01 2008-10-01 false Point Conception, CA to Point Sur, CA. 7.130 Section 7.130 Shipping...PUBLIC BOUNDARY LINES Pacific Coast § 7.130 Point Conception, CA to Point Sur, CA. (a) A line drawn from the...

2008-10-01

106

Sur le facteur de croissance du germe de blé. Son extraction par l'acétate de plomb et son action sur un champignon  

Microsoft Academic Search

1.La technique basée sur l'action de l'acétate de plomb permet, à partir du germe de blé, de concentrer un facteur de croissance agissant avec intensité sur le développment de Phycomyces en milieu synthétique.2.Cette technique ne permet pas d'attribuer au bios, non isolé, les phénomènes observés, la vitamine B 1 n'étant pas précipitée par l'acétate de plomb, et son action à

W. H. Schopfer

1934-01-01

107

[Marine algae of Baja California Sur, Mexico: nutritional value].  

PubMed

The Baja California Peninsula is one of the richest regions of seaweed resources in México. The objective of this study was to determine the chemical composition of some marine algae species of Baja California Sur, with an economical potential due to their abundance and distribution, and to promote their use as food for human consumption and animal feeding. The algae studied were Green (Ulva spp., Enteromorpha intestinalis, Caulerpa sertularoides, Bryopsis hypnoides), Red (Laurencia johnstonii, Spyridia filamentosa, Hypnea valentiae) and Brown (Sargassum herporizum, S. sinicola, Padina durvillaei, Hydroclathrus clathrathus, Colpomenia sinuosa). The algae were dried and ground before analysis. In general, the results showed that algae had a protein level less than 11%, except L. johnstonii with 18% and low energy content. The ether extract content was lower than 1%. However, the algae were a good source of carbohydrates and inorganic matter. PMID:12868282

Carrillo Domínguez, Silvia; Casas Valdez, Margarita; Ramos Ramos, Felipe; Pérez-Gil, Fernando; Sánchez Rodríguez, Ignacio

2002-12-01

108

Quelques remarques sur les surfaces lagrangiennes de Givental  

NASA Astrophysics Data System (ADS)

Nous donnons une nouvelle démonstration d'une formule énumérative de Givental sur les singularités de certaines surfaces lagrangiennes. La méthode est de comparer ces surfaces lagrangiennes singulières à des courbes complexes qui se désingularisent par éclatement. On obtient aussi une formule analogue modulo 4 pour des surfaces non-orientables et on montre comment obtenir tous les exemples de plongements lagrangiens de Givental par chirurgie lagrangienne. We give a new proof of an enumerative formula of Givental about the singularities of certain lagrangian surfaces. The method is to compare these lagrangian surfaces to complex curves which may be desingularised by blowing up. A modulo 4 formula for non-orientable surfaces is also obtained and it is shown how to construct all the Givental lagrangian embeddings by lagrangian surgery.

Audin, Michèle

109

« Heurs et malheurs de la domination d'ATT sur les services téléphoniques »  

Microsoft Academic Search

[fre] La déréglementation semble être un sujet récent en économie industrielle. Cependant, les services de télécommunications sont soumis depuis les années 1960 à une modification constante de leur cadre réglementaire. Les dispositions prises par la FCC en 1982 sont certainement les plus innovatrices, mais il serait naïf de croire qu'il s'agit de l'abandon d'un cadre réglementaire. En fait, ces dispositions

Jean-Louis Perrault

1987-01-01

110

Notes sur l'écologie et l'éthologie des espèces du genre Lasius (Hymenoptera Formicid?)  

Microsoft Academic Search

Résumé L'observation de l'emplacement et du mode de nidification des espèces du genreLasius dans leur milieu naturel a permis de mettre en évidence des exigences écologiques bien définies. De même, la complexité des techniques mises en ?uvre et le type de matérian employé lors de la construction des nids permettent de présenter un classement des mœurs des espèces du genreLasius.

Ch. Gaspar

1965-01-01

111

Remarques sur une étude de l'OCDE concernant la répartition des revenus dans divers pays  

Microsoft Academic Search

[fre] Remarques sur une étude de l'OCDE sur la répartition des revenus dans divers pays - L'OCDE a publié en juillet 1976 les résultats d'une étude consacrée à la répartition des revenus dans un certain nombre de pays dont la France. Il en ressort que la répartition des revenus est plus inégalitaire en France que dans tous les pays ayant

Jean Bégué

1976-01-01

112

Relativistic particles-in-cell code SUR\\/MP for laser-plasma interaction  

Microsoft Academic Search

The relativistic particles-in-cell code SUR\\/MP for kinetic simulation laser- plasma interaction is presented. The basic feature of this code is asynchronous paral- lelization is proposed. The modify PIC algorithms used in SUR\\/MP considered. The test of scalability in high performance calculations is presented. The result of parallel simulation of plasma channel formation by sequence of relativistic pulses is presented. The

N. V. Elkina; V. D. Levchenko

2003-01-01

113

Nouvelles infections émergentes: Impact sur la santé de l’enfant  

Microsoft Academic Search

RésuméL’interaction complexe de facteurs humains et environnementaux (facteurs écologiques, génétiques, politiques et socioéconomiques) est responsable de l’émergence et la réémergence de maladies infectieuses. Ces facteurs ont souvent un effet particulier sur les enfants et par conséquent, les infections émergentes peuvent avoir des effets spécifiques sur les populations pédiatriques en termes de santé physique et mentale mais aussi de bien-être social.

Jean M. van Seventer; Amanda DeLoureiro; Davidson H. Hamer

2009-01-01

114

A heterozygous activating mutation in the sulphonylurea receptor SUR1 (ABCC8) causes neonatal diabetes  

Microsoft Academic Search

Neonatal diabetes is a genetically heterogeneous disorder with nine different genetic aetiologies reported to date. Heterozygous activating mutations in the KCNJ11 gene encoding Kir6.2, the pore-forming subunit of the ATP-sensitive potassium (KATP) channel, are the most common cause of permanent neonatal diabetes. The sulphonylurea receptor (SUR) SUR1 serves as the regulatory subunit of the KATP channel in pancreatic beta cells.

Peter Proks; Amanda L. Arnold; Jan Bruining; Christophe Girard; Sarah E. Flanagan; Brian Larkin; Kevin Colclough; Andrew T. Hattersley; Frances M. Ashcroft; Sian Ellard

2006-01-01

115

Une analyse sur 20 ans de l'activité du bâtiment-travaux publics  

Microsoft Academic Search

[fre] Une analyse sur 20 ans de l'activité du bâtiment-travaux publics . Après plus de vingt ans d'une expansion continue, de 1 950 à 1 974, le BTP a connu entre 1 975 et 1 985 une sévère récession. Les deux chocs pétroliers l'ont fortement handicapé sur le marché intérieur. De ce point de vue, il est proche de ses

Jean-Pierre Berthier

1992-01-01

116

Modelisation microstructurale en fatigue/fluage a froid des alliages de titane quasi alpha par le modele des automates cellulaires  

NASA Astrophysics Data System (ADS)

Les proprietes d'emploi des alliages de titane sont extremement dependantes a certains aspects des microstructures developpees lors de leur elaboration. Ces microstructures peuvent etre fortement heterogenes du point de vue de leur orientation cristallographique et de leur repartition spatiale. Leurs influences sur le comportement du materiau et son endommagement precoce sont des questions qui sont actuellement soulevees. Dans le present projet de doctorat on chercher a repondre a cette question mais aussi de presenter des solutions tangibles quant a l'utilisation securitaire de ces alliages. Un nouveau modele appele automate cellulaire a ete developpe pour simuler le comportement mecanique des alliages de titane en fatigue-fluage a froid. Ces modeles ont permet de mieux comprendre la correlation entre la microstructure et le comportement mecanique du materiau et surtout une analyse detaillee du comportement local du materiau. Mots-cles: Automate cellulaire, fatigue/fluage, alliage de titane, inclusion d'Eshelby, modelisation

Boutana, Mohammed Nabil

117

Outstanding appearance of Ruppia maritima along Baja California Sur, México and its influence in trophic networks  

Microsoft Academic Search

Human impact and global warming are driving major modifications to the world’s ecosystems, the coastal zone being one of the\\u000a most damaged. Seagrass meadows constitute coastal communities that have experienced great losses worldwide. The dominant seagrass\\u000a in the meadows of the Pacific coast of North America is Zostera marina. There is evidence that Z. marina has been replaced in some

Jorge Lopez-Calderon; Rafael Riosmena-Rodríguez; Juan M. Rodríguez-Baron; Javier Carrión-Cortez; Jorge Torre; Alf Meling-López; Gustavo Hinojosa-Arango; Gustavo Hernández-Carmona; Jaqueline García-Hernández

2010-01-01

118

Influence de l'effet de peau sur la rotation d'un rotor fluide  

NASA Astrophysics Data System (ADS)

A rotating magnetic field creates forces in a liquid metal column which therefore rotates. In the case of an infinitely long column, we solve the induction and Navier-Stokes equations. The results are described for the fully coupled case which arises when the Hartmann number Ha and the shield parameter R_{?} are larger than unity. In this case, we distinguish between two velocity regimes upon the value of R_{?} with respect to frac{Ha}{sqrt{2}}. Un champ magnétique tournant autour d'une colonne de métal liquide crée des forces qui la mettent en rotation. Dans le cas d'une colonne de hauteur infinie, il est proposé une méthode de résolution des équations couplées régissant la distribution du champ magnétique et du champ de vitesse. Les résultats sont détaillés quand le couplage est fort ce qui correspond à un nombre de Hartmann Ha et un paramètre d'écran R_{?} grands devant l'unité. Dans ce cas, pour Ha donné, deux régimes apparaissent pour le champ de vitesse suivant que R_{?} est supérieur ou inférieur à frac{Ha}{sqrt{2}}.

Witkowski, L. Martin; Marty, Ph.

1998-01-01

119

Influence de l' acoustic streaming sur les instabilités affectant une couche de fluide chauffée latéralement  

NASA Astrophysics Data System (ADS)

The effect of acoustic streaming (more precisely the Eckart streaming) on the linear stability of a laterally heated fluid layer confined between two horizontal infinite walls (Hadley flow) has been studied. In the considered range of Prandtl number ( 4×10?Pr?1), three types of instabilities prevail in the absence of acoustic streaming: two-dimensional stationary instabilities for low Prandtl numbers, and three-dimensional oscillatory and then stationary instabilities for higher Prandtl numbers. When an acoustic beam of width H=0.8 (normalized by the layer depth) is applied, the thresholds of the two-dimensional modes, which become oscillatory, increase with the acoustic intensity (monitored through the parameter A) before strongly decreasing to reach the pure acoustic streaming instability threshold. Concerning the three-dimensional instabilities, the thresholds of the oscillatory modes increase while those of the stationary modes strongly decrease. For Pr=0.1, these evolutions induce the crossing of the critical curves of these two modes when A is increased, so that the oscillatory modes which are dominant for small values of A are replaced by the stationary modes for larger values of A. The position of the crossing depends on the width H of the acoustic beam. To cite this article: W. Dridi et al., C. R. Mecanique 337 (2009).

Dridi, Walid; Henry, Daniel; BenHadid, Hamda

2009-04-01

120

Influence du Procédé de Contrôle Sur Les Tolérances de Réalisation des Filtres Interférentiels à Bande Etroite  

Microsoft Academic Search

Pour contrôler la formation de couches d'épaisseurs optiques ne égales ou multiples d'une même valeur u0\\/4, on utilise couramment des méthodes optiques. Il est en particulier commode de repérer, au cours de l'évaporation, pour la longueur d'onde de centrage du filtre u0, les extremums du facteur de transmission T. Mais on doit bien distinguer les extremums correspondant à ?T\\/? e=0

E. Pelletier; R. Kowalczyk; A. Fornier

1973-01-01

121

L'influence de l'investissement sur la productivité via le progrès technique  

Microsoft Academic Search

[fre] L'investissement induit-il des gains de productivité ? Une telle relation entre investissement et productivité suppose l'existence d'un progrès technique incorporé aux équipements. Cette hypothèse est indispensable pour que le dynamisme de l'investissement puisse améliorer la compétitivité-prix des entreprises françaises. . L'estimation d'une fonction de production mesurant le progrès technique incorporé apporte des éléments de réponse à cette question. Réalisée

Gilbert Cette; Daniel Szpiro

1990-01-01

122

Influence du terrain (insuffisance hépatocellulaire et insuffisance rénale) sur la stratégie nutritionnelle  

Microsoft Academic Search

Chronic liver disease as well as chronic renal failure are responsible for abnormal nutrient metabolism and high rates of undernutrition. Although surgery is frequently required in such patients, the perioperative nutritional management has not yet been extensively studied in these conditions. During chronic liver disease, preoperative nutritional status and postoperative outcome are correlated. However, nutritional status can only be considered

N. Cano

1995-01-01

123

L'influence des cultures du risque sur l'expertise scientifique. Le cas des ogm  

Microsoft Academic Search

[eng] With the case of GMOs, we show in this paper how the way risk assessment is implemented in scientific expertise and is framed by epistemics cultures. Mainly based on molecular biology principles, this culture contributes to define norms about the social utility of innovation. In France, scientific expertise has played a major role until 1 997 in the design

Alexis Roy

2002-01-01

124

Shifting Rationales: The Waning Influence of Feminism on Canada's Embryo Research Restrictions  

Microsoft Academic Search

Résumé:Le présent article analyse les influences concurrentes qui s'exercent à l'égard de la politique et de la loi éventuelle du gouvernement fédéral en matière de la recherche sur les embryons au Canada. En commençant par les événements entourant la création de la Commission royale sur les nouvelles techniques de reproduction, l'article trace l'importance réduite des raisonnements féministes quant à la

Diana Backhouse; Maneesha Deckha

2009-01-01

125

Etude de la répartition sur le substrat de particules de poudre injectées par un fluide porteur dans le procédé de dépôt par faisceau laser  

NASA Astrophysics Data System (ADS)

In laser surface application, one of the routes is to spurt the gas-carrying the metal or ceramic powder from the laser outlet after being melted to the coating layer on the surface of the substrate. The distribution of spurted powder particles have a great influence on the quality of laser application. This paper discusses theoretically the movement of the carried powder material after being spurted from the outlet and the distribution form of the powder coating on the surface of the substrate achieved near spraying nozzle. This corresponds to the results of the experiment. This is of great theoric significance to the improvement of the laser surface application and also provides references to the improvement of the distribution form of powder coating in experimentation. Parmi les nombreuses techniques de dépôts superficiels à l'aide de faisceau laser, l'une d'entre elles consiste à utiliser un gaz comme vecteur de transport de la poudre céramique ou métallique, l'axe du flux d'injection étant coaxial à celui du laser. Après fusion sous l'impact du faisceau laser, la poudre forme un dépôt sur le substrat. En conséquence, la qualité de celui-ci est fortement affectée par la répartition des particules au moment de l'injection sur le substrat. L'étude présentée dans cet article a pour objet de déterminer la trajectoire des particules de poudre injectées et d'en déterminer la courbe de répartition au voisinage de la buse d'injection. Ce travail théorique expose les données permettant d'améliorer la qualité des dépôts. De plus, il propose des critères opératoires permettant de modifier la distribution des particules de poudre sur le substrat.

Ren, Enyang

1994-10-01

126

Internal Tide Generation at the Sur Platform Region of Monterey Bay  

NASA Astrophysics Data System (ADS)

Understanding the evolution of the internal tide field within the complex coastal ocean environment is essential to describing the interplay between bathymetry, internal tides, and areas of elevated dissipation. In an effort to gain insight into internal tide generation within the Monterey Bay area, we used high-resolution numerical simulation results from the nonhydrostatic, nonlinear, unstructured grid code SUNTANS. Our depth-integrated, M2-period averaged energy fluxes and energy flux divergences show the bulk of internal tide energy propagating from the south and into the Monterey Submarine Canyon from a location north of Sur Platform. From our previous simulations, a region of elevated internal tide activity occurs north of Sur Platform. Here we analyze and shed light on its structure and generation mechanism. Instantaneous plots of baroclinic velocity and horizontal kinetic energy are used to show the horizontal and vertical structure of the internal tide. When model results are plotted along with theoretical tidal characteristics, it may be concluded that the internal tide generated at the Sur Platform region is three-dimensional and linear. Furthermore, our simulation suggests the hotspot of internal tide activity north of Sur Platform results from the interaction between tidal beams generated from Sur Platform (north-south direction) and the shelf break (east- west direction). Acknowledgment: This work is supported by ONR grant N00014-05-1-0294. Simulations are carried out on the JVN cluster at the ARL Major Shared Resource Center.

Jachec, S. M.; Fringer, O. B.; Gerritsen, M. G.; Street, R. L.

2007-12-01

127

Effet intergenerationnel de la selection et de l'assimilation des immigrants sur les resultats en matiere de sante des enfants  

Microsoft Academic Search

Dans la presente etude, nous procedons a trois comparaisons fondees sur les donnees recueillies au deuxieme cycle (1996 1997) de l'Enquete longitudinale nationale sur les enfants et les jeunes (ELNEJ) au Canada. En premier lieu, nous comparons les resultats sur le plan de la sante des enfants des personnes nees au Canada (canadiennes de naissance ou CDN) et ceux du

Nina Ahmed

2005-01-01

128

Le risque d’adénocarcinome sur œsophage de Barrett : résultat d’une étude multicentrique  

Microsoft Academic Search

Résumé  Une étude multicentrique destinée à évaluer le risque d’adénocarcinome sur œsophage de Barrett a débuté en Italie en novembre\\u000a 1987. Jusqu’en octobre 1991, 420 malades sur 31 000 soumis à une endoscopie digestive haute, ont subi des biopsies multiples\\u000a au niveau du tiers inférieur de l’œsophage en raison de l’existence d’un reflux gastro-œsophagien (RGO). Un œsophage de Barrett\\u000a a été

L. Bonelli; M. Conio; H. Aste

1992-01-01

129

Soil hydraulic properties and their effect on surface and subsurface water transfer in a tropical rainforest catchment \\/ Propriétés hydrauliques du sol et leur effet sur les transferts d'eau de surface ou hypodermique dans un bassin de forêt en zone tropicale humide  

Microsoft Academic Search

This paper examines spatial and temporal heterogeneity of the surface, subsurface and vertical drainage components within and between three sites in a 25.7 ha tropical rainforest catchment. Our analysis indicates that saturation overland flow depends on the relationships between temporal variations in rainfall intensity, the upper soil store capacity, and the spatial variation of saturated hydraulic conductivity in the subsoil

M. BONELL; D. A. GILMOUR; D. F. SINCLAIR

1981-01-01

130

Vaccination with Brucella recombinant DnaK and SurA proteins induces protection against Brucella abortus infection in BALB\\/c mice  

Microsoft Academic Search

The immunogenicity and protective efficacy of recombinant SurA (rSurA) and rDnaK from Brucella spp. were evaluated in BALB\\/c mice. Immunization with rSurA in adjuvant induced a vigorous immunoglobulin G (IgG) response, with higher IgG2a than IgG1 titers. In addition, after in vitro stimulation with rSurA, spleen cells from rSurA-immunized mice produced interleukin-2 (IL-2), interferon (IFN)-?, IL-4 and IL-5. Immunization with

Maria Victoria Delpino; Silvia Marcela Estein; Carlos Alberto Fossati; Pablo César Baldi; Juliana Cassataro

2007-01-01

131

Diet and nutrition of range goats on a sarcocaulescent shrubland from Baja California Sur, Mexico  

Microsoft Academic Search

Botanical composition of diets of range goats was studied to determine seasonal preference indices of forage species and nutritional quality of selected diets on a sarcocaulescent shrubland from the Sonoran desert in Baja California Sur, Mexico. Extrusas from five esophageal cannulated adult female goats (40kg of BW) were collected at the beginning and at the end of each season from

R. Ramírez-Orduña; R. G. Ramírez; E. Romero-Vadillo; H. González-Rodríguez; J. A. Armenta-Quintana; R. Avalos-Castro

2008-01-01

132

Enjeux, médiations et développement local. Un point sur le mouvement des pays. Modernité et modernisation  

Microsoft Academic Search

[fre] Une analyse socio-politique de ce mouvement qui vise à centrer, sur une petite zone dite « pays », un ensemble d'initiatives et de forces. L'objectif de cette action est d'assurer le développement du « pays » et de mobiliser les ressources locales. Mais ce mouvement, complexe et divers, fait apparaître des contradictions entre la « modernité » et certaines

A. Boudou; J.-P. Neumann; G. Allaire

1985-01-01

133

Sea turtle consumption and black market trade in Baja California Sur, Mexico  

Microsoft Academic Search

We examined sea turtle consumption and illegal trade in Baja California Sur (BCS) using data from (1) bimonthly surveys at beaches, fishing camps and dumpsites and (2) semi-struc- tured interviews with fishermen. From March 2006 to February 2008, we found the carcasses of 1014 sea turtles; the meat of 461 of these turtles (45.5%) had been consumed. The East Pacific

Agnese Mancini; Volker Koch

2009-01-01

134

Reflections on "Petit Battement sur le Cou de Pied": Is It Still Relevant?  

ERIC Educational Resources Information Center

This article presents multiple perspectives of "petit battement sur le cou de pied". These perspectives include historical, biomechanical, and pedagogic points of view. The article offers useful information for ballet specialists and applied research studies aimed at ballet pedagogy. (Contains 2 tables and 5 figures.)

Paskevska, Anna

2007-01-01

135

46 CFR 7.130 - Point Conception, CA to Point Sur, CA.  

Code of Federal Regulations, 2012 CFR

...Pacific Coast § 7.130 Point Conception, CA to Point Sur, CA. (a) A line drawn from the southernmost extremity of Fossil Point at longitude 120°43.5ⲠW. to the seaward extremity of Whaler Island Breakwater. (b) A line drawn from the...

2012-10-01

136

46 CFR 7.130 - Point Conception, CA to Point Sur, CA.  

Code of Federal Regulations, 2011 CFR

...Pacific Coast § 7.130 Point Conception, CA to Point Sur, CA. (a) A line drawn from the southernmost extremity of Fossil Point at longitude 120°43.5ⲠW. to the seaward extremity of Whaler Island Breakwater. (b) A line drawn from the...

2011-10-01

137

Water production in an ancient sarcophagus at Arles-sur-Tech (France)  

Microsoft Academic Search

It has been claimed, from at least the 16th century on, that a sealed sarcophagus, located in the yard of the abbey of Arles-sur-Tech (France), produces hundreds of litres of water per year. Many hypotheses have been advanced to explain this mystery. After about 3 years of data collection, it is concluded that water production, which amounts to about 200

D. Beysens; M. Muselli; J.-P. Ferrari; A. Junca

2001-01-01

138

Impact of sudden oak death on tree mortality in the Big Sur ecoregion of California  

Microsoft Academic Search

The Big Sur ecoregion in coastal California is a botanically and ecologically diverse area that has recently experienced substantial\\u000a mortality of oak (Quercus spp.) and tanoak (Lithocarpus densiflorus) trees due to the emerging forest disease sudden oak death, caused by the invasive pathogen Phytophthora ramorum. In response to the urgent need to examine environmental impacts and create management response strategies,

R. K. Meentemeyer; N. E. Rank; D. A. Shoemaker; C. B. Oneal; A. C. Wickland; K. M. Frangioso; D. M. Rizzo

2008-01-01

139

Implementation of tsunami disaster prevention measures in the municipality of San Rafael del Sur, Nicaragua  

Microsoft Academic Search

The Nicaraguan Pacific coast presents considerable tsunami risk. On September 1, 1992, a tsunami caused enormous damage in the infrastructure and killed more than 170 people. A pilot project was conducted between 2006 and 2007 in the municipality of San Rafel del Sur, area of Masachapa, The project included multiple topics of tsunami prevention measures and considering the direct participation

W. Strauch; E. Talavera; N. Acosta; M. Sanchez; E. Mejia

2007-01-01

140

Late Pleistocene (Last Interglacial) terrace deposits, Bahia Coyote, Baja California Sur, México  

Microsoft Academic Search

Late Pleistocene age terrace deposits are exposed in the narrow cliffed coastal plain of Bahia Coyote, Baja California Sur, resting unconformably on the lagoonal-shallow water volcaniclastics of the early Miocene Cerro Colorado Member of the El Cien Formation. The terrace is dissected by widely spaced arroyos and partically covered by alluvial fans in the inner and central areas. The marine

Teresa DeDiego-Forbis; Robert Douglas; Donn Gorsline; Enrique Nava-Sanchez; Larry Mack; Jay Banner

2004-01-01

141

Vente en ligne et piratage sur le marché des biens culturels numérisables  

Microsoft Academic Search

La récente numérisation des biens soumis aux droits d'auteur et de copie, ainsi que l'avènement du réseau Internet a considérable- ment modi…é les comportements sur le marché des biens culturels. L'inquiétude née du succés des logiciels \\

Sylvain Dejean

2004-01-01

142

Late Quaternary Faulting along the San Juan de los Planes Fault Zone, Baja California Sur, Mexico  

Microsoft Academic Search

As a result of continued distributed deformation in the Gulf Extensional Province along an oblique-divergent plate margin, active normal faulting is well manifest in southeastern Baja California. By characterizing normal-fault related deformation along the San Juan de los Planes fault zone (SJPFZ) southwest of La Paz, Baja California Sur we contribute to understanding the patterns and rates of faulting along

M. M. Busch; J. A. Coyan; J. Arrowsmith; S. J. Maloney; G. Gutierrez; P. J. Umhoefer

2007-01-01

143

FENOLOGIA FLORAL DE UNA COMUNIDAD ARIDO-TROPICAL DE BAJA CALIFORNIA SUR, MEXICO  

Microsoft Academic Search

A flowering phenology study was carried out in a plant community close to the Gulf of California coast in the southern part of Baja California Sur, Mexico. The area is located on the border between two phytographical provinces: the Cape Region of arid-tropical features and the Sonoran Desert. Among several characteristics, the site presents a bimodal rain pattern, the maxima

JOSE LUIS LEON DE LA LUZ; ROCIO CORIA BENET; MINERVA CRUZ ESTRADA

144

Late Pleistocene (Last Interglacial) terrace deposits, Bahia Coyote, Baja California Sur, M! exico  

Microsoft Academic Search

Late Pleistocene age terrace deposits are exposed in the narrow cliffed coastal plain of Bahia Coyote, Baja California Sur, resting unconformably on the lagoonal-shallow water volcaniclastics of the early Miocene Cerro Colorado Member of the El Cien Formation. The terrace is dissected by widely spaced arroyos and partically covered by alluvial fans in the inner and central areas. The marine

Teresa DeDiego; Robert Douglas; Donn Gorsline; Enrique Nava-Sanchez

145

Engineered interaction between SUR1 and Kir6.2 that enhances ATP sensitivity in KATP channels  

PubMed Central

The ATP-sensitive potassium (KATP) channel consisting of the inward rectifier Kir6.2 and SUR1 (sulfonylurea receptor 1) couples cell metabolism to membrane excitability and regulates insulin secretion. Inhibition by intracellular ATP is a hallmark feature of the channel. ATP sensitivity is conferred by Kir6.2 but enhanced by SUR1. The mechanism by which SUR1 increases channel ATP sensitivity is not understood. In this study, we report molecular interactions between SUR1 and Kir6.2 that markedly alter channel ATP sensitivity. Channels bearing an E203K mutation in SUR1 and a Q52E in Kir6.2 exhibit ATP sensitivity ?100-fold higher than wild-type channels. Cross-linking of E203C in SUR1 and Q52C in Kir6.2 locks the channel in a closed state and is reversible by reducing agents, demonstrating close proximity of the two residues. Our results reveal that ATP sensitivity in KATP channels is a dynamic parameter dictated by interactions between SUR1 and Kir6.2.

Zhou, Qing; Gay, Joel W.

2012-01-01

146

Identifying tsunami deposits using shell taphonomy: Sur lagoon, Oman  

NASA Astrophysics Data System (ADS)

On November 28th, 1945 an 8.1 magnitude earthquake focused in the eastern portion of the Makran subduction zone (Arabian Sea) generated a powerful tsunami that destroyed many coastal villages in Pakistan and India. Reports indicate that the tsunami also caused significant damage in Muscat, Oman, although its effects elsewhere in Oman are unknown. A thick bivalve dominated shell horizon was discovered inside the Sur lagoon, which is located on the eastern promontory of Oman (200 km south of Muscat). This shell deposit is significant because it is laterally extensive (> 1 km2), extends deep within the lagoon (>2 km), ranges in thickness from 5 - 25 cm at the sample localities, contains numerous subtidal and offshore bivalve species, and articulated subtidal and offshore bivalve species are abundant. Although there is an absence of typical tsunami indicators such as allochthonous sediment in and around the lagoon, verbal accounts, cultural evidence recovered during coring, and the absence of strong storms during the past 100 years indicates that this shell unit was caused by the 1945 tsunami. In this setting, it would be advantageous to have another proxy for tsunami detection and risk prediction. The use of shell taphonomy is one of the potential indicators and here we present new evidence of its utility. We sampled this unit in eight locations, and compared the shell taphonomy to surface shell samples collected from beach and reworked horizons in the lagoon, and to shell samples from a known tsunami and corresponding storm/ballast deposit in Israel (Reinhardt et al., 2006). Taphonomic analysis yielded promising results, as the two tsunami horizons shared excellent agreement between the amount of fragmented shells, and the percentage of shells displaying angular breaks. Both of these categories were significantly different from the percentage of fragments and angular fragments recovered from the reworked, beach, and storm/ballast deposits, indicating different environmental factors acting upon the shell assemblages. These results suggest that tsunamigenic shell deposits can be identified based on their taphonomic characteristics when compared to beach and storm deposits in the same setting. Our data indicates that the following diagnostic taphonomic characteristics may indicate a tsunamigenic deposit: 1) presence/absence of articulated bivalves, 2) increased percentage of fragmented valves, 3) increased percentage of angular fragments, and 4) the large number of offshore bivalves in the lagoon. This study highlights the potential benefits and opportunity for using bivalve taphonomy as a useful indicator of paleotsunami deposits, particularly in protected coastal embayments in arid regions where stratified deposits might not readily preserve. This technique holds potential, as shell deposits are easy to identify in the field by non-experts, is very low cost, and analysis uses simple, easily applicable and recognizable taphonomic characteristics. Furthermore, this proxy can be used for risk assessment purposes in coastal areas with a seismic history but lacking a paleotsunami record. Further testing of this hypothesis should be conducted along the Omani coastline, particularly in the lagoons along the Eastern promontory. Key Words: tsunami, taphonomy, Oman, bivalve

Donato, S.; Reinhardt, E.; Rothaus, R.; Boyce, J.

2007-05-01

147

Reduced expression of Kir6.2\\/SUR2A subunits explains K ATP deficiency in K +-depleted rats  

Microsoft Academic Search

We investigated on the mechanism responsible for the reduced ATP-sensitive K+(KATP) channel activity recorded from skeletal muscle of K+-depleted rats. Patch-clamp and gene expression measurements of KATP channel subunits were performed. A down-regulation of the KATP channel subunits Kir6.2(?70%) and SUR2A(?46%) in skeletal muscles of K+-depleted rats but no changes in the expression of Kir6.1, SUR1 and SUR2B subunits were

Domenico Tricarico; Antonietta Mele; Birgit Liss; Frances M. Ashcroft; Andrew L. Lundquist; Reshma R. Desai; Alfred L. George; Diana Conte Camerino

2008-01-01

148

Être Meilleur Apprenti de France : Quels effets sur l’accès à l’emploi ? Les enseignements de deux expériences contrôlées sur des jeunes d’Ile-de- France  

Microsoft Academic Search

Cette étude examine si la mention d’une récompense au concours d’excellence « un des Meilleurs Apprentis de France » (MAF) dans le curriculum vitae d’un jeune diplômé d’un CAP a un effet sur ses chances d’obtenir un entretien d’embauche. Les évaluations sont réalisées sur des données expérimentales construites à l’aide de deux campagnes de testing conduites entre avril et septembre

PASCALE PETIT; FLORENT FREMIGACCI; LOÏC DU PARQUET; GUILLAUME PIERNE

149

Introduccion, establecimiento y potencial de Apion ulicis como antagonista de Ulex europaeus en el sur de Chile  

Microsoft Academic Search

Resumen  El coleópteroApion ulicis Forster, introducido desde Nueva Zelanda se estableció exitosamente enUlex europaeus L. en todas las localidades del Sur de Chile donde fue introducido, entre los paralelos 37 y 43 grados Lat. Sur.\\u000a \\u000a Los niveles de consumo de semilla que muestran las plantas infestadas con este insecto, indican queA. ulicis puede ser un valioso agente de control biológico de

H. Norambuena; R. Carrillo; M. Neira

1986-01-01

150

Effect of the “InSurE” procedure on cerebral oxygenation and electrical brain activity of the preterm infant  

Microsoft Academic Search

Background:In preterm infants with respiratory distress syndrome (RDS) nasal continuous positive airway pressure (nCPAP) with the “InSurE” procedure (intubation, surfactant, extubation) is increasingly used. However, its effect on cerebral oxygenation and brain function is not known.Objective:To evaluate the effects of the “InSurE” procedure in infants with RDS on regional cerebral oxygen saturation (rScO2) and relative cerebral fractional tissue oxygen extraction

E van den Berg; P M A Lemmers; M C Toet; J H G Klaessens; F van Bel

2010-01-01

151

Ingénierie des systèmes de commutation optique et des réseaux locaux à large bande sur fibres optiques : analyses et perspectives  

Microsoft Academic Search

Résumé  Après un rappel sur l’évolution de la fonction commutation dansle rnis, qui met l’accent sur la mutation du commutateur temporel classique, l’article présente une analyse prospective et une\\u000a évaluation des techniques et technologies utilisables en commutation optique et dans les réseaux à large bande : systèmes\\u000a de commutation optiques spatiaux (architectures, technologies à base de diélectriques, de semiconducteurs, de matériaux

Tayeb Ben Meriem

1990-01-01

152

The Sur7p Family Defines Novel Cortical Domains in Saccharomyces cerevisiae, Affects Sphingolipid Metabolism, and Is Involved in Sporulation  

Microsoft Academic Search

We have discovered a novel cortical patch structure in Saccharomyces cerevisiae defined by a family of integral plasma membrane proteins, including Sur7p, Ynl194p, and Ydl222p. Sur7p-family patches localized as cortical patches that were immobile and stable. These patches were polarized to regions of the cell with a mature cell wall; they were absent from small buds and the tips of

Michael E. Young; Tatiana S. Karpova; Britta Brugger; Darcy M. Moschenross; Georgeann K. Wang; Roger Schneiter; Felix T. Wieland; John A. Cooper

2002-01-01

153

The Sur7 Protein Regulates Plasma Membrane Organization and Prevents Intracellular Cell Wall Growth in Candida albicans  

Microsoft Academic Search

The Candida albicans plasma membrane plays important roles in cell growth and as a target for antifungal drugs. Analysis of Ca-Sur7 showed that this four transmembrane domain protein localized to stable punctate patches, similar to the plasma membrane subdomains known as eisosomes or MCC that were discovered in S. cerevisiae. The localization of Ca-Sur7 depended on sphingolipid synthesis. In contrast

Francisco J. Alvarez; Lois M. Douglas; Adam Rosebrock; James B. Konopka

2008-01-01

154

Structure of SurE protein from Aquifex aeolicus VF5 at 1.5 ? resolution  

PubMed Central

SurE is a stationary-phase survival protein found in bacteria, eukaryotes and archaea that exhibits a divalent-metal-ion-dependent phosphatase activity and acts as a nucleotidase and polyphosphate phosphohydrolase. The structure of the SurE protein from the hyperthermophile Aquifex aeolicus has been solved at 1.5?Å resolution using molecular replacement with one dimer in the asymmetric unit and refined to an R factor of 15.6%. The crystal packing reveals that two dimers assemble to form a tetramer, although gel-filtration chromatography showed the presence of only a dimer in solution. The phosphatase active-site pocket was occupied by sulfate ions from the crystallization medium.

Antonyuk, Svetlana V.; Ellis, Mark J.; Strange, Richard W.; Bessho, Yoshitaka; Kuramitsu, Seiki; Shinkai, Akeo; Yokoyama, Shigeyuki; Hasnain, S. Samar

2009-01-01

155

Fonction maximale centrée de Hardy-Littlewood sur les espaces hyperboliques  

NASA Astrophysics Data System (ADS)

On montre que la fonction maximale centrée de Hardy-Littlewood, M, sur les espaces hyperboliques réels {H}n = {R}^{{{raise .17exhbox riptstyle +}{raise .17exhbox riptstyle +}{raise .1exhbox riptscriptstyle +}riptscriptstyle +}} × {R}^{n - 1}, satisfait l'inégalité de type faible \\| M f \\|_{L^{1, infty}} ? A (n log {n}) \\| f\\|1 pour toute f? L 1(? n ), où A>0 est une constante indépendante de la dimension n.

Li, Hong-Quan; Lohoué, Noël

2012-10-01

156

Note sur l’établissement d’un Abaque de Blondel universel et de grande précision  

Microsoft Academic Search

Sommaire  Après uneintroduction sur l’origine de son étude (extension de la technique desCables portés), l’auteur en indiquel’objet; étendre et faciliter l’emploi de la méthode graphique en s’affranchissant des limites et des inconvénients du classiqueAbaque de Blondel. Pour cela il établit d’abord un système d’équations envariables réduites, donc valables dans tous les cas. Puis, par destransformations géométriques simplificatries, il élargit le champ

François Cordelle

1949-01-01

157

Possibilités et limites du diagnostic de lymphome primitif sur biopsies gastriques endoscopiques  

Microsoft Academic Search

Résumé  Chez les patients porteurs de lymphome gastrique primitif, l'efficacité diagnostique de la biopsie endoscopique préopératoire\\u000a dépend du nombre et de la profondeur des prélèvements. En combinant une technique de prélèvements nombreux en sites multiples,\\u000a le rendement diagnostique de notre série a été de 19 patients positifs sur 24 tandis que le diagnostic de lymphome était suspecté\\u000a chez deux autres patients

J. Bellassai; H. Noel; P. Mainguet; J. Haot

1982-01-01

158

La transmission par solitons sur fibre optique soliton transmission on optical fibres  

Microsoft Academic Search

Résumé  ?amplification optique a considérablement modifié la conception des systèmes de transmission sur fibre optique, particulièrement\\u000a celle des systèmes à grande distance tels que les systèmes transocéaniques. Elle a conduit à prendre en compte ?accumulation\\u000a des effets de la dispersion chromatique et de ?automodulation de phase ainsi que celle du bruit ?émission spontanée amplifiée.\\u000a Dans ce contexte, la technique de transmission

Patrick Vandamme; Jean-Baptiste Thomine; Philippe Gallion

1995-01-01

159

[Polyplacophoran communities (Mollusca: Polyplacophora) at Bahia de La Paz, Baja California Sur, México].  

PubMed

Eight species of polyplacophorans have been reported from La Bahia de la Paz, Baja California Sur, Mexico. We add Lepidochitona beanii, Chaetopleura lurida, Stenoplax limaciformis, S. mariposa, Lepidozona clathrata, L. serrata and Acanthochitona arragonites, increasing the known number of species to 15. Ordination analysis of five chiton communities at the site suggests a correlation of wave exposure to species composition and diversity: communities with intermediate wave exposure have more species (richness) and higher diversity (Shannon's index). PMID:18457125

García Ríos, Cedar I; Alvarez Ruiz, Migdalia

2007-03-01

160

Multimodal 3-D reconstruction of human anatomical structures using SurLens Visualization System.  

PubMed

In the medical diagnosis and treatment planning, radiologists and surgeons rely heavily on the slices produced by medical imaging devices. Unfortunately, these image scanners could only present the 3-D human anatomical structure in 2-D. Traditionally, this requires medical professional concerned to study and analyze the 2-D images based on their expert experience. This is tedious, time consuming and prone to error; expecially when certain features are occluding the desired region of interest. Reconstruction procedures was earlier proposed to handle such situation. However, 3-D reconstruction system requires high performance computation and longer processing time. Integrating efficient reconstruction system into clinical procedures involves high resulting cost. Previously, brain's blood vessels reconstruction with MRA was achieved using SurLens Visualization System. However, adapting such system to other image modalities, applicable to the entire human anatomical structures, would be a meaningful contribution towards achieving a resourceful system for medical diagnosis and disease therapy. This paper attempts to adapt SurLens to possible visualisation of abnormalities in human anatomical structures using CT and MR images. The study was evaluated with brain MR images from the department of Surgery, University of North Carolina, United States and CT abdominal pelvic, from the Swedish National Infrastructure for Computing. The MR images contain around 109 datasets each of T1-FLASH, T2-Weighted, DTI and T1-MPRAGE. Significantly, visualization of human anatomical structure was achieved without prior segmentation. SurLens was adapted to visualize and display abnormalities, such as an indication of walderstrom's macroglobulinemia, stroke and penetrating brain injury in the human brain using Magentic Resonance (MR) images. Moreover, possible abnormalities in abdominal pelvic was also visualized using Computed Tomography (CT) slices. The study shows SurLens' functionality as a 3-D Multimodal Visualization System. PMID:23605637

Adeshina, A M; Hashim, R; Khalid, N E A; Abidin, S Z Z

2013-04-19

161

Rapid subsidence and stacked Gilbert-type fan deltas, Pliocene Loreto basin, Baja California Sur, Mexico  

Microsoft Academic Search

Pliocene nonmarine to marine sedimentary rocks exposed in the Loreto basin, Baja California Sur, provide a record of syntectonic subsidence and sedimentation in a transform-rift basin that developed along the western margin of the Gulf of California. A thick sequence of twelve Gilbert-type fan deltas, having a total measured thickness of about 615 m, accumulated near the fault-bounded southwestern margin

Rebecca J. Dorsey; Paul J. Umhoefer; Paul R. Renne

1995-01-01

162

A NOTE ON AGRICULTURAL CREDIT IN SUDAN \\/ UNE NOTE CRITIQUE SUR LE CRÉDIT AGRICOLE AU SOUDAN  

Microsoft Academic Search

Comme dans la plupart des pays africains, le financement de l'agriculture au Soudan est un problème complexe; le financement est fait par le secteur privé (par l'épargne privée directement ou par l'intermédiaire des banques commerciales) et par le secteur public également (les financements octroyés par le gouvernement aux sociétés de développement agricole sur son budget courant et de développement où

Jean M. Due

1980-01-01

163

Une revue de la littérature académique anglo-saxonne sur la grande distribution alimentaire  

Microsoft Academic Search

[fre] Cet article présente une revue d'un échantillon représentatif de la littérature anglo saxonne des vingt dernières années, sur le thème de la concentration du pouvoir de marché et des relations de cette concentration avec les prix de détail et les profits. Le schéma «Structure de marché-pouvoir-performance» s'applique au comportement et aux performances générales de ce secteur et met en

Jean D. Kinsey

1998-01-01

164

Issue des accouchements sur ut?rus cicatriciel dans un h?pital universitaire au Burkina  

PubMed Central

Certains auteurs ont tendance à privilégier la césarienne comme méthode de prise en charge d'une parturiente porteuse d'un utérus cicatriciel. D'autres auteurs préconisent un accouchement par voie basse quand des paramètres cliniques précis sont observés. Le but de cette étude est d'analyser la prise en charge et l'issue des accouchements sur utérus cicatriciel au Centre Hospitalier Universitaire Souro Sanou de Bobo-Dioulasso et de la comparer aux différentes approches recommandées. Nous avons menés une étude transversale dans le Département de Gynécologie d'Obstétrique et de Médecine de la Reproduction du Centre Hospitalier Universitaire Sanou Souro de Bobo Dioulasso du 1er août 2006 au 1er août 2007 et a concerné 252 parturientes ayant un utérus cicatriciel parmi 4256 accouchements déroulés pendant la même période. Les accouchements sur utérus cicatriciels ont représenté 5,92 % de l'ensemble des accouchements dans notre département. La moyenne d'âge des patientes était de 26,2 ans et la parité moyenne de 4,3. Une césarienne d'emblée a été pratiquée chez 44% des parturientes ayant un utérus cicatriciel et 56 % parmi elles ont fait l'objet d'une épreuve utérine. Sur l'ensemble des épreuves utérines, 61% des parturientes ont accouché par voie basse. La mortalité maternelle était nulle et La mortalité périnatale était relativement importante. Les conditions d'acceptabilité de la voie basse ont été les mêmes chez toutes les patientes et un check liste a été proposé pour une meilleure prise en charge. L'épreuve utérine en salle d'accouchement doit être la règle à chaque fois que cela est possible chez une parturiente porteuse d'utérus cicatriciel. L’établissement d'un check liste pour accouchement par voie basse sur utérus cicatriciel facilite les prises de décision.

Dembele, Adama; Tarnagda, Zekiba; Ouedraogo, Jean Louis; Thiombiano, Oumarou; Bambara, Moussa

2012-01-01

165

Confiance dans les associations et positionnement dans le débat public sur les OGM  

Microsoft Academic Search

L'apparition des plantes Génétiquement Modifiées, en Europe, a donné lieu à des débats importants. Issue de ce débat, la réglementation actuelle concernant les OGM apparaît comme le résultat d'une dynamique contradictoire entre les différents intérêts d'acteurs (mouvement associatif, lobby industriel, expert et scientifique, représentants politiques) organisés en groupes de pression, s'appuyant chacun sur différents registres de justification des bienfaits ou

Samira Chaklatti; Damien Rousselière

2005-01-01

166

Improved CenSurE feature and a new rapid descriptor of GSIP  

NASA Astrophysics Data System (ADS)

Image matching is a fundamental aspect of many problems in computer vision applications. Many of these applications have real-time constraints. Recently there has been much interest in object and view matching using local invariant features and descriptor. Center surround extrema (CenSurE) features have aroused wide interest because of the high compute efficiency. Due to its linear scales, the filter response signal is very sparse, can't acquire high repeatability. So, we modified the center-surround detectors (CenSurE) using logarithmic scale sampling, and to detect the features of image interpolation, obtained the subpixel level of accuracy. The results of image matching experiments and theory analyzing demonstrate that improved center-surround detectors are more stable and repeatable than CenSurE. At the same time, we proposed a new rapid descriptor based on gradient of the summed image patch, called GSIP. The results of image region matching experiments demonstrate that the GSIP descriptor has better distinctiveness than the state-of-the-art SURF descriptor, and achieves a 2 fold speed increase. The local feature and descriptor present here can be used widely in real-time view matching fields, including motion tracking, solving for 3D structure from multiple images, and robots visual navigation.

Chen, Fang

2011-06-01

167

Sur la reponse en frequence du tissu nerveux dans le cortex  

NASA Astrophysics Data System (ADS)

Dans cette These de Physique, nous avons etudie la dependance en frequence du champ electrique du tissu nerveux dans le cortex. Ce champ est aussi designe par "Local field Potential" LFP dans la litterature scientifique. Cette etude est fondee sur la theorie du champ electromagnetisme de Maxwell et sur de l'information tiree de la donne experimentale. Le resultat essentiel de cette These est que la grandeur enorme du temps de relaxation de Maxwell des membranes cellulaires semble etre la cause principale de la dependance en frequence des LFPs. Cette dependance en frequence causee par chaque membrane cellulaire est l'analogue d'un circuit RC ou la resistance R est la resistivite parallele d'une membrane cellulaire, et ou la capacite C est la permittivite electrique de la membrane. L'effet resultant d'un tres grand nombre de cellules donne un spectre de Fourier dont l'enveloppe est tres pres d'un signal en 1/f. Le modele physique propose dans cette These permet de lier les mesures prises a l'interieur d'une dendrite des variations de potentiel electrique a celles prises dans le liquide extracellulaire. De plus, cette These semble ouvrir la possibilite de mesurer le temps de relaxation de Maxwell des membranes cellulaires a l'aide de la mesure de la reponse en frequence du potentiel electrique extracellulaire (LFP). Enfin, cette These permet de lever le voile sur un sujet peu etudie, principalement en raison de la difficulte que represente l'etude des phenomenes electriques dans des milieux complexes comme les tissus vivants. En particulier, le probleme du filtrage frequentiel du potentiel electrique extracellulaire est une propriete fondamentale du tissu nerveux et son origine n'est pas connue.

Bedard, Claude

168

Instrumentation pour la spectroscopie laser sur faisceau d'ions rapides  

NASA Astrophysics Data System (ADS)

Devant l'emergence des technologies exploitant l'infiniment petit, la spectroscopie atomique et moleculaire devient de plus en plus incontournable pour comprendre precisement les mecanismes quantiques impliques dans l'interaction des molecules. C'est le cas notamment de la nanotechnologie, de la dynamique reactionnelle des gaz a effet de serre ou simplement de l'identification des molecules constituant certains objets de l'astrophysique. Bien qu'un travail considerable soit deja accompli pour comprendre la dissociation ou la formation des molecules simples, il reste a vaincre la complexite des mecanismes impliques lorsque les molecules possedent plus de trois noyaux. Parmi les rares techniques de spectroscopie a tres haute resolution (jusqu'a la structure hyperfine), la spectroscopie laser sur faisceaux d'ions rapides est une methode experimentale eprouvee depuis trois decennies environ. Cette methode spectroscopique fournit des resultats comptant parmi les meilleurs pour obtenir des constantes moleculaires precises et permettre la reduction du spectre moleculaire. Une particularite remarquable de notre instrument est la possibilite d'enregistrer le signal de fragmentation moleculaire par laser via les etats de predissociation de la molecule etudiee. Notre contribution a ete d'ameliorer et de moderniser l'equipement existant. Nous avons augmente la resolution spectrale de notre instrument. Nous avons atteint notre principal objectif, a savoir, la possibilite d'acquerir des spectres selon deux modes : par detection du signal synchronisee sur le faisceau laser module en frequence ou par detection du signal directement par comptage. Cette derniere methode est une premiere sur ce type d'instrument et son principal interet a ete d'obtenir une meilleure mesure de l'elargissement de raie. Nous sommes parvenus a mettre clairement en evidence l'elargissement de raie avec la puissance laser en utilisant la methode de detection par comptage direct. La fluorescence induite par laser, l'etude spectroscopique des etats de predissociation des molecules, l'analyse en energie cinetique des fragments moleculaires sont autant d'approches spectroscopiques qui ont pu etre appliquees avec succes avec notre instrument. Suite aux transformations que nous y avons apportees, l'instrument a acquis encore plus de souplesse en permettant l'etude spectroscopique des atomes ou molecules neutres ou charges selon deux modes de detection rapidement commutables. Un programme de controle a ete entierement concu pour automatiser le travail d'acquisition du signal et le gerer au moyen d'une interface utilisateur conviviale. Cet instrument est aujourd'hui pret pour effectuer efficacement des mesures systematiques sur de nombreuses molecules simples.

Bazin, Marc

169

Que nous apprennent les petits fr?res et soeurs sur les signes pr?coces d'autisme?1  

PubMed Central

L’objectif de cette revue est de présenter une synthèse des réponses que l’on peut actuellement apporter à la question de savoir quelles sont les premières caractéristiques comportementales qui prédisent le développement de l’autisme. L’article se centre sur 5 points : la présence de Troubles du Spectre Autistique (TSA) dans des groupes de frères et sœurs puînés d’enfants déjà diagnostiqués, les patterns et caractéristiques du développement moteur, les patterns et caractéristiques du développement social et émotionnel, les patterns et caractéristiques de la communication intentionnelle verbale et non verbale, et les patterns qui marquent le début de comportements pathognomoniques de TSA. La discussion porte sur les aspects inattendus des résultats et les pistes de recherche nouvelles qu’ils peuvent engendrer.

Rogers, Sally J.

2010-01-01

170

Thermal-maturity trends within Franciscan rocks near Big Sur, California: Implications for offset along the San Gregorio San Simeon Hosgri fault zone  

Microsoft Academic Search

Conventional neotectonic interpretations place the Lucia and Point Sur subterranes of the Franciscan subduction complex on opposite sides of the San Gregorio San Simeon Hosgri dextral fault system and connect that system through the Sur fault zone. Our reconstructed paleotemperature contours, however, are not offset across the San Simeon segment, so differential displacement between the subterranes after peak heating appears

Michael B. Underwood; Matthew M. Laughland; Kevin L. Shelton; Richard L. Sedlock

1995-01-01

171

Molecular Mechanisms of Microvascular Failure in CNS Injury - Synergistic Roles of NKCC1 and SUR1/TRPM4  

PubMed Central

Microvascular failure largely underlies the damaging secondary events that accompany traumatic brain injury (TBI). Changes in capillary permeability result in the extravasation of extracellular fluid, inflammatory cells, and blood, thereby producing cerebral edema, inflammation, and progressive secondary hemorrhage (PSH). Recent work in rat models of TBI and stroke have implicated two ion transport proteins expressed in brain endothelial cells as critical mediators of edema formation: the constitutively-expressed Na+-K+-2Cl? cotransporter, NKCC1, and the trauma/ischemia-induced SUR1-regulated NCCa-ATP (SUR1/TRPM4) channel. Whereas NKCC1 function requires ATP, activation of SUR1/TRPM4 occurs only after ATP depletion. This opposite dependence on intracellular ATP levels implies that one or the other mechanism will activate/deactivate as ATP concentrations rise and fall during periods of ischemia/reperfusion, resulting in continuous edema formation regardless of cellular energy status. Moreover, with critical ATP depletion, sustained opening of SUR1/TRPM4 channels results in the oncotic death of endothelial cells, leading to capillary fragmentation and secondary hemorrhage. Bumetanide and glibenclamide are two well-characterized, safe, FDA-approved drugs that inhibit NKCC1 and the SUR1/TRPM4 channel, respectively. When used alone, these drugs have documented beneficial effects in animal models of TBI-and ischemia-associated cerebral edema and PSH. Given the mechanistic and temporal differences by which NKCC1 and the SUR1/TRPM4 channel contribute to the pathophysiology of these events, combination therapy with bumetanide and glibenclamide may yield critical synergy in preventing injury-associated capillary failure.

Kahle, Kristopher T.; Gerzanich, Volodymyr; Simard, J. Marc

2011-01-01

172

De la démarche palliative aux soins de supports ou du Groupe de réflexion sur l’accompagnement et les soins palliatifs en hématologie (GRASPH) au Groupe de réflexion sur l’accompagnement et les soins de support pour les patients en hématologie et oncologie (GRASSPHO)  

Microsoft Academic Search

Résumé  Le Groupe de réflexion sur l’accompagnement et les soins palliatifs en hématologie (GRASPH) fut créé en 1991 sur le concept\\u000a de la démarche palliative qui affirme que la mise en place d’une démarche participative des équipes centrées sur le malade\\u000a permet une meilleure prise en charge du patient et des proches. Ce concept, repris dans plusieurs textes officiels et plusieurs

P. Colombat; G. Nallet; D. Jaulmes; J. Ceccaldi; M. Gardembas-Pain; C. Bauchetet-Delan; M. Moriceau; L. Chassignol; V. Frasie

2008-01-01

173

Influence des traitements de fluoration sur les propriétés de transport des céramiques YBa2CU3O{7-delta}  

Microsoft Academic Search

The degradation of YBa2CU3O{7-delta} ceramics obtained by solid state sintering is known to be due to carbonation processes. The presence of a carbonate layer at the solid\\/gas interface contributes to decrease the critical current density after several months ageing in air conditions. Fluorination treatments carried out on YBa2CU3O{7-delta} ceramics immediately after the sintering process increase noticeably Jc by a curing

C. Magro; J. M. Heintz; A. Tressaud; J. P. Bonnet; J. Etourneau

1991-01-01

174

Influence des acides gras à chaîne courte ou moyenne sur la dynamique du cholestérol chez le rat  

Microsoft Academic Search

The effects of a diet consisting of 10% medium-chain triglycerides (C8:0, C10:0) or 10% homogeneous triglycerides of 6- to 14-carbon chain saturated fatty acids on cholesterol turnover processes were studied in rats using the isotope equilibrium method. Cholesterol absorption was not significantly affected by the type of dietary fatty acid ingested. In contrast, lengthening of the fatty acid chain caused

C. Lutton; T. Magot; D. Mathé; J. C. Sulpice; F. Chevallier

1983-01-01

175

Influence d’une hémodynamique pulmonaire perturbée sur l’obstruction bronchique précoce chez les patients souffrant de troubles mitraux  

Microsoft Academic Search

32 subjects affected with mitral stenosis were investigated. All the subjects were nonsmokers, and none had any histories of lung disease. Mean pulmonary artery pressure (PAp) and mean wedge pressure (Pc) were obtained by right catherization and compared with a number of sensitive tests for the detection of incipient bronchial obstruction: dynamic and static lung compliance (CLdyn, CLStat); maximal expiratory

L. Matanov; R. Bachtchevandjieva; T. Kirkova

1981-01-01

176

Influence de l'écrouissage sur les propriétés magnétiques d'alliages Fe-3 %Si non orientés  

NASA Astrophysics Data System (ADS)

Magnetic characteristics were measured on stress-strain test pieces of non oriented 3 %SiFe with a magnetic measurement frame. Plotting various magnetic properties against plastic deformation shows an exponential damage for low and medium values of magnetic field amplitude. This phenomenon is much weaker when high magnetic field amplitudes are reached. Metallurgical state of the material between 0 and 0.5 % is characterized by the Lddotuders strain state, which involves an important heterogeneous dislocations structure inside the metal die. After this, dislocation structure remains more and less homogeneous from 0 to 10 % strain (small tangles and isolated dislocations). These two dislocations structures are the more harmful for the magnetic properties of the alloys. From \\varepsilon_p = 10 % to fracture, dislocations configuration becomes progressively inhomogencous and walls of high density are created but any supplementary magnetic damage is observed. Potential theories are not able to explain our experimental results but domain wall bowing theories could successfully be applied. Coercive field versus plastic stress displays two distinct linear evolutions against three in the case of polycristalline high-purity iron, as shown by others authors.

Hug, E.; Kant, M.; Clavel, M.

1994-07-01

177

Influence des caractéristiques dynamiques de l'enveloppe d'un bâtiment sur le confort thermique au sud Algérien  

Microsoft Academic Search

The development of towns in southern Algeria, was like the northern cities, thus marginalizing the very harsh climatic characteristics of these regions. From this habitat type derived from the integration issues involving climate consume considerable energy for the thermal comfort. The objective in the context of this work is to obtain a level of thermal comfort with energy consumption reduced

N. Fezzioui; B. Droui; M. Benyamine; S. Larbi

178

Does inhibiting Sur1 complement rt-PA in cerebral ischemia?  

PubMed Central

Hemorrhagic transformation (HT) associated with recombinant tissue plasminogen activator (rt-PA) complicates and limits its use in stroke. Here, we provide a focused review on the involvement of matrix metalloproteinase 9 (MMP-9) in rt-PA–associated HT in cerebral ischemia, and we review emerging evidence that the selective inhibitor of the sulfonylurea receptor 1 (Sur1), glibenclamide (U.S. adopted name, glyburide), may provide protection against rt-PA–associated HT in cerebral ischemia. Glyburide inhibits activation of MMP-9, ameliorates edema formation, swelling, and symptomatic hemorrhagic transformation, and improves preclinical outcomes in several clinically relevant models of stroke, both without and with rt-PA treatment. A retrospective clinical study comparing outcomes in diabetic patients with stroke treated with rt-PA showed that those who were previously on and were maintained on a sulfonylurea fared significantly better than those whose diabetes was managed without sulfonylureas. Inhibition of Sur1 with injectable glyburide holds promise for ameliorating rt-PA–associated HT in stroke.

Simard, J. Marc; Geng, Zhihua; Silver, Frank L.; Sheth, Kevin N.; Kimberly, W. Taylor; Stern, Barney J.; Colucci, Mario; Gerzanich, Volodymyr

2012-01-01

179

Adsorption de gaz sur les materiaux microporeux modelisation, thermodynamique et applications  

NASA Astrophysics Data System (ADS)

Nos travaux sur l'adsorption de gaz dans les materiaux microporeux s'inscrivent dans le cadre des recherches visant a augmenter l'efficacite du stockage de l'hydrogene a bord des vehicules. Notre objectif etait d'etudier la possibilite d'utiliser l'adsorption afin d'ameliorer l'efficacite de la liquefaction de l'hydrogene des systemes a petite echelle. Nous avons egalement evalue les performances d'un systeme de stockage cryogenique de l'hydrogene base sur la physisorption. Comme nous avons affaire a des plages de temperatures particulierement etendues et a de hautes pressions dans la region supercritique du gaz, nous avons du commencer par travailler sur la modelisation et la thermodynamique de l'adsorption. La representation de la quantite de gaz adsorbee en fonction de la temperature et de la pression par un modele semi-empirique est un outil utile pour determiner la masse de gaz adsorbee dans un systeme mais egalement pour calculer les effets thermiques lies a l'adsorption. Nous avons adapte le modele Dubinin-Astakhov (D-A) pour modeliser des isothermes d'adsorption d'hydrogene, d'azote et de methane sur du charbon actif a haute pression et sur une grande plage de temperatures supercritiques en considerant un volume d'adsorption invariant. Avec cinq parametres de regression (incluant le volume d'adsorption Va), le modele que nous avons developpe permet de tres bien representer des isothermes experimentales d'adsorption d'hydrogene (de 30 a 293 K, jusqu'a 6 MPa), d'azote (de 93 a 298 K, jusqu'a 6 MPa) et de methane (de 243 a 333 K, jusqu'a 9 MPa) sur le charbon actif. Nous avons calcule l'energie interne de la phase adsorbee a partir du modele en nous servant de la thermodynamique des solutions sans negliger le volume d'adsorption. Par la suite, nous avons presente les equations de conservation de la niasse et de l'energie pour un systeme d'adsorption et valide notre demarche en comparant des simulations et des tests d'adsorption et de desorption. En plus de l'energie interne, nous avons evalue l'entropie, l'energie differentielle d'adsorption et la chaleur isosterique d'adsorption. Nous avons etudie la performance d'un systeme de stockage d'hydrogene par adsorption pour les vehicules. La capacite de stockage d'hydrogene et les performances thermiques d'un reservoir de 150 L contenant du charbon actif Maxsorb MSC-30(TM) (surface specifique ˜ 3000 m2/g) ont ete etudiees sur une plage de temperatures de 60 a 298 K et a des pressions allant jusqu'a 35 MPa. Le systeme a ete considere de facon globale, sans nous attarder a un design particulier. Il est possible de stocker 5 kg d'hydrogene a des pressions de 7.8, 15.2 et 29 MPa pour des temperatures respectivement de 80, 114 et 172 K, lorsqu'on recupere l'hydrogene residuel a 2.5 bars en le chauffant. La simulation des phenomenes thermiques nous a permis d'analyser le refroidissement necessaire lors du remplissage, le chauffage lors de la decharge et le temps de dormance. Nous avons developpe un cycle de liquefaction de l'hydrogene base sur l'adsorption avec compression mecanique (ACM) et avons evalue sa faisabilite. L'objectif etait d'augmenter sensiblement l'efficacite des systemes de liquefaction de l'hydrogene a petite echelle (moins d'une tonne/jour) et ce, sans en augmenter le cout en capital. Nous avons adapte le cycle de refrigeration par ACM afin qu'il puisse par la suite etre ajoute a un cycle de liquefaction de l'hydrogene. Nous avons ensuite simule des cycles idealises de refrigeration par ACM. Meme dans ces conditions ideales, la refrigeration specifique est faible. De plus, l'efficacite theorique maximale de ces cycles de refrigeration est d'environ 20 a 30% de l'ideal. Nous avons realise experimentalement un cycle de refrigeration par ACM avec le couple azote/charbon actif. (Abstract shortened by UMI.)

Richard, Marc-Andre

180

Implementation of tsunami disaster prevention measures in the municipality of San Rafael del Sur, Nicaragua  

NASA Astrophysics Data System (ADS)

The Nicaraguan Pacific coast presents considerable tsunami risk. On September 1, 1992, a tsunami caused enormous damage in the infrastructure and killed more than 170 people. A pilot project was conducted between 2006 and 2007 in the municipality of San Rafel del Sur, area of Masachapa, The project included multiple topics of tsunami prevention measures and considering the direct participation of the local population, as: -General education on disaster prevention, participative events; -Investigation of awareness level and information needs for different population groups; -Specific educational measures in the schools; -Publication of brochures, calendars, news paper articles, radio programs, TV spots -Development of local tsunami hazard maps, 1:5,000 scale; (based on previous regional tsunami hazard mapping projects and local participation) -Development of a tsunami warning plan; -Improvements of the national tsunami warning system. -Installation of sirens for tsunami warning -Installation of tsunami signs, indicating hazardous areas, evacuation routes, safe places; -Realization of evacuation drills in schools. Based on the experiences gained in Masachapa it is planned to run similar projects in other areas along the Nicaraguan Pacific coast. In the project participated the local municipality and local stakeholders of San Rafael del Sur, Ministry of Education, National Police, Nicaraguan Red Cross, Ministry of Health, Ministry of Tourism, Nicaraguan Geosciences Institute (INETER), National System for Disaster Prevention (SINAPRED), Swiss Agency for Development and Cooperation (SDC). It was financed by SDC and INETER.

Strauch, W.; Talavera, E.; Acosta, N.; Sanchez, M.; Mejia, E.

2007-05-01

181

Producción primaria de los mangles del Estero El Conchalito en Bahía de La Paz (Baja California Sur, México) Mangrove primary production at El Conchalito Estuary in La Paz Bay (Baja California Sur, Mexico)  

Microsoft Academic Search

The structure, litterfall production, and primary production of the mangrove stand at El Conchalito Estuary in La Paz Bay (Baja California Sur, Mexico) were studied during two annual cycles (1998-2000). The mangrove stand is composed of white mangrove Laguncularia racemosa (L), red mangrove Rhizophora mangle L, and black mangrove Avicennia germinans (L). The dominant physiognomy of the stand corresponded to

EF Félix-Pico; OE Holguín-Quiñones; A Hernández-Herrera; F Flores-Verdugo

2006-01-01

182

Influence of caffeine and cysteine on post-irradiation oxygen-dependent and -independent components of damage in Hordeum vulgare  

Microsoft Academic Search

Résumé La cystéine est un radio-protecteur plus efficace que la caféine contre le dommage post-irradiatoire dû à l'oxygène. Mais la cystéine n'exerce aucune influence sur la partie du dommage qui ne dépend pas de l'oxygène et la caféine accentue ce dommage. Dans le traitement simultané de caféine et de cystéine, c'est seulement la caféine qui détermine l'amplitude et le genre

P. C. Kesavan; A. Ahmad

1974-01-01

183

Effets tardifs d'une irradiation corporelle totale sur le métabolisme intraneuronal de la dopamine et de la sérotonine  

NASA Astrophysics Data System (ADS)

Whole-body irradiation leads to delayed cognitive dysfunction which could result from perturbations of neurotransmission, specially the dopaminergic and the serotoninergic one. The aim of this study was to determine the concentrations of dopamine (DA), serotonin (5-HT) and their metabolites in three cerebral areas of rats, one month after (neutron-gamma) irradiation at 3.38Gy. An increase of DA, 5-HT, and their catabolites was observed. These effects are weak but observed in older rats. Au cours des mois suivant une irradiation corporell totale peuvent se manifester des troubles comportementaux qui pourraient être la conséquence d'altérations de la neuraotransmission, plus particulièrement de la transmission dopaminergique ou sérotoninergique. Nous avons recherché les variations des taux de dopamine (DA), de sérotonine (5-HT) et de leurs métabolites dans 3structures cérébrales 1 mois après une irradiation (neutron-gamma) à la dose de 3,38Gy. Les résultats préliminaires mettent en évidence une augmentation des taux de DA, de 5-HT et de leurs catabolites ; ces effets sont plus discrets mais similaires à ceux observés chez des animaux plus âgés.

Joubert, C.; Jacquet, N.; Lambert, F.; Martin, S.; Martin, C.

1998-04-01

184

Habitat availability for the mule deer (Cervidae) population in a relictual oak-pine forest in Baja California Sur, Mexico  

Microsoft Academic Search

We estimated the mule deer Odocoileus hemionus peninsulae (Lydekker 1898) population in six locations of an oak-pine forest in the Sierra de La Laguna in the Cape Region of Baja California Sur, Mexico, during 7 consecutive years (1987 to 1993). The most important habitat variables for deer (plant biomass, cover, and water) were measured over five wet and dry seasons

S. Alvarez-Cárdenas; S. Gallina; P. Galina-Tessaro; R. Dominguez-Cadena

1999-01-01

185

September diet and reproductive state of Uta stansburiana (Phrynosomatidae) at Isla San Roque, Baja California Sur, México  

Microsoft Academic Search

In September 1994 we studied the only reptile species,Uta stansburiana elegans, at Isla San Roque off the Pacific coast of Baja California Sur. Three censuses of lizards were made over all the island. Outside the census transect, 10 adult lizards of each sex were collected. Analysis of data obtained from the reproductive tracts and stomach contents are shown. A seaweed

Patricia Galina-Tessaro; Alfredo Ortega-Rubio; Heidi Romero-Schmidt; Carmen Blázquez

1997-01-01

186

SurA Is Involved in the Targeting to the Outer Membrane of a Tat Signal Sequence-Anchored Protein  

PubMed Central

The twin arginine translocation (Tat) pathway exports folded proteins from the cytoplasm to the periplasm of bacteria. The targeting of the exported proteins to the Tat pathway relies on a specific amino-terminal signal sequence, which is cleaved after exportation. In the phytopathogen Dickeya dadantii, the pectin lyase homologue PnlH is exported by the Tat pathway without cleavage of its signal sequence, which anchors PnlH into the outer membrane. In proteobacteria, the vast majority of outer membrane proteins consists of ?-barrel proteins and lipoproteins. Thus, PnlH represents a new kind of outer membrane protein. In Escherichia coli, periplasmic chaperones SurA, Skp, and DegP work together with the ?-barrel assembly machinery (Bam) to target and insert ?-barrel proteins into the outer membrane. In this work, we showed that SurA is required for an efficient targeting of PnlH to the outer membrane. Moreover, we were able to detect an in vitro interaction between SurA and the PnlH signal sequence. Since the PnlH signal sequence contains a highly hydrophobic region, we propose that SurA protects it from the hydrophobic periplasm during targeting of PnlH to the outer membrane. We also studied the nature of the information carried by the PnlH signal sequence responsible for its targeting to the outer membrane after exportation by the Tat system.

Rondelet, Arnaud

2012-01-01

187

The LGU Extension Services in a Major Rice-Growing Area : The Case of Hagonoy, Davao del Sur  

Microsoft Academic Search

The province of Davao del Sur is considered one of the major rice-producing provinces of Region XI. It has been regarded as Mindanaos top rice-yielding province because of its municipalitys (Hagonoy) high yield performance. Hagonoys average rice yield of more than six tons per hectare has consistently been higher than the provincial average of a little more than five tons

Rosa Fe D. Hondrade

2007-01-01

188

Evaluación de elementos estructurales del hábitat del borrego cimarrón en la Sierra del Mechudo, Baja California Sur, México  

Microsoft Academic Search

Habitat lost and fragmentation can result in an isolated and local extinction risk for small populations like Ovis canadensis weemsi Goldman, 1937, in Sierra del Mechudo, Baja California Sur, Mexico. That is why it is important to evaluate the relationship between species and their habitat in order to design management and conservation plans. The object of this study was to

Sergio Alvarez-Cárdenas; Patricia Galina-Tessaro; Sara Díaz-Castro; Israel Guerrero-Cárdenas; Aradit Castellanos-Vera; Erika Mesa-Zavala

189

A Mouse Model of Human Hyperinsulinism Produced by the E1506K Mutation in the Sulphonylurea Receptor SUR1.  

PubMed

Loss-of-function mutations in the KATP channel genes KCNJ11 and ABCC8 cause neonatal hyperinsulinism in humans. Dominantly inherited mutations cause less severe disease, which may progress to glucose intolerance and diabetes in later life (e.g., SUR1-E1506K). We generated a mouse expressing SUR1-E1506K in place of SUR1. KATP channel inhibition by MgATP was enhanced in both homozygous (homE1506K) and heterozygous (hetE1506K) mutant mice, due to impaired channel activation by MgADP. As a consequence, mutant ?-cells showed less on-cell KATP channel activity and fired action potentials in glucose-free solution. HomE1506K mice exhibited enhanced insulin secretion and lower fasting blood glucose within 8 weeks of birth, but reduced insulin secretion and impaired glucose tolerance at 6 months of age. These changes correlated with a lower insulin content; unlike wild-type or hetE1506K mice, insulin content did not increase with age in homE1506K mice. There was no difference in the number and size of islets or ?-cells in the three types of mice, or evidence of ?-cell proliferation. We conclude that the gradual development of glucose intolerance in patients with the SUR1-E1506K mutation might, as in the mouse model, result from impaired insulin secretion due a failure of insulin content to increase with age. PMID:23903354

Shimomura, Kenju; Tusa, Maija; Iberl, Michaela; Brereton, Melissa F; Kaizik, Stephan; Proks, Peter; Lahmann, Carolina; Yaluri, Nagendra; Modi, Shalem; Huopio, Hanna; Ustinov, Jarkko; Otonkoski, Timo; Laakso, Markku; Ashcroft, Frances M

2013-07-31

190

Géolocalisation à partir d'images en environnement urbain en s'appuyant sur un SIG 2D  

Microsoft Academic Search

Cet article présente une approche de localisation particulièrement adaptée à une utilisation en milieu urbain dense, capable de fournir une initialisation de la pose pour des applications de Réalité Aug- mentée. Elle est basée sur une mise en correspondance des données SIG (Système d'Information Géographique) avec des photogra- phies prises dans la rue. Dans un premier temps, une géométrie partielle

Nicolas Bioret; Ecole Centrale de Nantes; Guillaume Moreau

191

Contrôle cohérent de la dynamique de fragmentation d'agrégats alcalins  

NASA Astrophysics Data System (ADS)

Les agrégats métalliques présentent des propriétés extraordinaires, en particulier chimiques et catalytiques, qui dépendent fortement de leur taille. Ce comportement en fait des candidats idéaux pour l'analyse en temps réel de processus photo-induits ultrarapides, le but ultime étant la conduite de scénarios de contrôle cohérent. Nous avons réalisé des expériences d'ionisation multiphotonique non stationnaire sur de petits agrégats alcalins de différentes tailles et dans différents états électroniques rovibrationnels, y compris leur état fondamental, sondant ainsi leur dynamique ondulatoire, leur orientation structurelle, leur transfert de charge et leur dissociation. Les processus observés dépendent grandement des paramètres du faisceau laser d'excitation, tels que sa phase, son amplitude et sa durée ; cette sensibilité plaide pour l'emploi d'un système de contrôle rétroactif permettant de générer les formes d'impulsion optimales. Les caractéristiques spectrales et temporelles de ces dernières reflètent les propriétés du système étudié ainsi que les processus photochimiques que l'irradiation y induit. Nous présentons d'abord la dynamique vibrationelle d'états électroniques excités, liés, dissociatifs et prédissociatifs, des dimères et trimères alcalins. Suit une description du principe d'observation par pompage optique par effet Raman stimulé de la dynamique d'un paquet d'onde dans l'état électronique fondamental. Puisque les paramètres de l'impulsion d'excitation influencent de façon significative le poids des différentes trajectoires dans l'espace des phases, nous avons mené des expériences sur les canaux de fragmentation concurrents d'une réaction photo-induite, en étudiant les différents embranchements des voies d'ionisation et de fragmentation de Na{2}K excité électroniquement. L'utilisation d'un algorithme évolutif, pour l'optimisation de la phase et de l'amplitude de l'onde électromagnétique appliquée, permit d'influencer significativement la quantité résultante d'ions parents ou fragments. Des propriétés intéressantes sont déduites de la forme des impulsions laser optimales obtenues, qui révèlent la période de vibration moléculaire et qui, combinées aux courbes de potentiel, permettent de proposer les trajectoires que l'optimisation impose aux paquets d'onde. Pour finir, nous avons étudié comment une variété plus grande d'agrégats, en contribuant au canal de fragmentation NaK, influe sur la forme optimale d'impulsion. Là encore, la structure de cette dernière apporte des éclaircissements sur les canaux de fragmentation empruntés durant le processus de contrôle.

Lindinger, A.; Lupulescu, C.; Le Roux, J.; Bartelt, A.; Vajda, Š.; Wöste, L.

2004-11-01

192

The Periplasmic Bacterial Molecular Chaperone SurA Adapts Its Structure to Bind Peptides in Different Conformations to Assert a Sequence Preference for Aromatic Residues  

SciTech Connect

The periplasmic molecular chaperone protein SurA facilitates correct folding and maturation of outer membrane proteins in Gram-negative bacteria. It preferentially binds peptides that have a high fraction of aromatic amino acids. Phage display selections, isothermal titration calorimetry and crystallographic structure determination have been used to elucidate the basis of the binding specificity. The peptide recognition is imparted by the first peptidyl-prolyl isomerase (PPIase) domain of SurA. Crystal structures of complexes between peptides of sequence WEYIPNV and NFTLKFWDIFRK with the first PPIase domain of the Escherichia coli SurA protein at 1.3 A resolution, and of a complex between the dodecapeptide and a SurA fragment lacking the second PPIase domain at 3.4 A resolution, have been solved. SurA binds as a monomer to the heptapeptide in an extended conformation. It binds as a dimer to the dodecapeptide in an alpha-helical conformation, predicated on a substantial structural rearrangement of the SurA protein. In both cases, side-chains of aromatic residues of the peptides contribute a large fraction of the binding interactions. SurA therefore asserts a recognition preference for aromatic amino acids in a variety of sequence configurations by adopting alternative tertiary and quaternary structures to bind peptides in different conformations.

Xu, X.; Wang, S.; Hu, Y.-X.; McKay, D.B.

2009-06-04

193

Potential toxicity of resuspended particulate matter and sediments: Environmental samples from the Bay of Banyuls-sur-Mer and Thermaikos Gulf  

NASA Astrophysics Data System (ADS)

This contribution attempts to determine whether, and to what degree, environmental samples of resuspended particulate matter and sediments exert a toxicological impact. Further, an attempt is made also to screen the toxic level of potentially hazardous sites, based upon established sediment toxicity criteria. Therefore, a rapid, cost-effective and highly sensitive biotest (bioluminescence assay, based upon marine bacteria) has been applied on: biological fluid extracts; bottom sediments; and sediment trap samples. Samples were taken either from the Bay of Banyuls-sur-Mer (northwestern Mediterranean, France) or Thermaikos Gulf (northeastern Mediterranean, Greece). Biological fluid extracts and sediment trap samples corresponded to periods of resuspension events, or preceding and following such events. The results have revealed that the sampling strategy and biotest implemented in this study might be a useful tool for screening the toxicity of resuspended matter and sediments. Resuspension events appear to be able to exert an influence on the chemical forms of the micro-pollutants; thus on their bioavailability and toxicity. Nevertheless, based upon chemical analysis combined with the bioassay, the toxic level of the sediment samples could be determined, with the level at potentially hazardous sites being characterised.

Cotou, E.; Gremare, A.; Charles, F.; Hatzianestis, I.; Sklivagou, E.

2005-12-01

194

Experiential environmental learning: A case study of innovative pedagogy in Baja Sur, Mexico  

NASA Astrophysics Data System (ADS)

This mixed methods case study describes an innovative two-semester middle school environmental learning course that departs from traditional Mexican expository pedagogy through the incorporation of experiential and service learning. This research takes place in a small middle school in Pescadero, Baja California Sur, Mexico. The research approach utilized in the study adds to the handful of studies in this cross-disciplinary field by employing quantitative methodologies to measure course outcomes on student environmental knowledge, perceptions, and actions, while simultaneously qualitatively describing the behavioral, educational, environmental, and social experiences of students. This research employs Dewey's theories of experience---as well as those of more contemporary authenticity theorists---in order to identify the philosophies that advocate incorporating experiential pedagogy within the curriculum. Implications for Mexican educational policy, practical pedagogical applications, and theory are discussed.

Schneller, Andrew Jon

195

Influence du coefficient d'etalement sur les ecoulements triphasiques en milieu poreux. (Influence of spreading coefficient on three phase flows in porous media).  

National Technical Information Service (NTIS)

The injection of water and gas in an oil-field involves the coexistence of three fluid phases in the porous medium. Such a system can be characterized by its spreading coefficient S, which is a balance between the three fluid/fluid interfacial tensions. I...

M. Tixier

1993-01-01

196

Thermal-maturity trends within Franciscan rocks near Big Sur, California: Implications for offset along the San Gregorio San Simeon Hosgri fault zone  

NASA Astrophysics Data System (ADS)

Conventional neotectonic interpretations place the Lucia and Point Sur subterranes of the Franciscan subduction complex on opposite sides of the San Gregorio San Simeon Hosgri dextral fault system and connect that system through the Sur fault zone. Our reconstructed paleotemperature contours, however, are not offset across the San Simeon segment, so differential displacement between the subterranes after peak heating appears to have been negligible. One explanation is that dextral slip on the faults has totaled only 5 10 km. A second possibility is that a discrete Hosgri San Simeon segment extends offshore of the amalgamated Point Sur and Lucia subterranes and that an en echelon stepover transfers dextral slip eastward to the San Gregorio Palo Colorado segment. In either case, the Sur fault zone appears to play a relatively insignificant role in the late Cenozoic tectonic evolution of central California.

Underwood, Michael B.; Laughland, Matthew M.; Shelton, Kevin L.; Sedlock, Richard L.

1995-09-01

197

Summary of Gender-Related Research Findings and Recommendations for the Pilot Environmental Communication Campaigns from Palawan, Davao del Sur and Cebu Provinces.  

National Technical Information Service (NTIS)

This GreenCOM report summarizes the gender-related findings from three formative research reports conducted in Palawan, Davao del Sur and Cebu Provinces and makes recommendations for the pilot environmental communication campaigns. The report draws upon t...

1997-01-01

198

ETUDE DE NOUVELLES REACTIONS PAR TRANSFERT MONOELECTRONIQUE: ACTION D'ORGANOGERMYLLITHIUMS SUR LE FURFURAL LE THIOPHENALDEHYDE ET LES DERIVES NITRES CORRESPONDANTS  

Microsoft Academic Search

Les organogermyllithiums R3GeLi (R = Ph, Mes) ont été confronted à divers composés carbonylés conjugués (furfural, thiophénaldéhyde et leurs dérivés nitrés). Seules les réactions de germylation du groupement carbonyle ont été observées mais avec une régiosélectivité dépendant de l'hétérocycle insaturé. Dans le cas du furfural et du thiophénaldéhyde, les germylcarbinols 1 correspondants à une réaction de C-germylation, sont obtenus de

P. Rivière; A. Castel; F. Cosledan

1995-01-01

199

Les immigrants tres scolarises obtiennent-ils des resultats differents sur le marche du travail au Canada et aux Etats-Unis?  

Microsoft Academic Search

On compare dans le present document les changements dans les salaires des nouveaux travailleurs immigrants titulaires d'un diplome universitaire au Canada et aux Etats-Unis au cours de la periode allant de 1980 a 2005 a ceux de leurs homologues nes au pays et a ceux des diplomes d'etudes secondaires (avantage salarial du diplome universitaire). Les salaires des nouveaux immigrants de

Aneta Hou Feng Picot Garnett Bonikowska

2011-01-01

200

QUALITÉ DES EAUX SOUTERRAINES DANS UNE RÉGION ARIDE DU MAROC: IMPACT DES POLLUTIONS SUR LA BIODIVERSITÉ ET RELATIONS CRUSTACÉS – BACTÉRIES D'INTÉRÊT SANITAIRE  

Microsoft Academic Search

Au nord de la ville de Marrakech (Maroc), l'activité anthropique intense et la perméabilité des terrains géologiques rendent la nappe phréatique des Jbilet vulnérable. Les résultats des analyses physico?chimiques, réalisées sur l'eau des puits durant l'année 2006, ont permis aux auteurs de distinguer deux groupes de puits. D'une part ceux situés sur la rive droite de l'Oued Tensift, loin de

F. Hallam; K. Oufdou; M. Boulanouar

2008-01-01

201

Capitalisation immobilière des gains d'accessibilité : état de l'art et étude de cas sur l'agglomération lyonnaise  

Microsoft Academic Search

Cet article s'intéresse à la mesure de la capitalisation immobilière des externalités liées aux gains d'accessibilité induits par la mise en place d'une nouvelle infrastructure de transport. Pour cela, nous avons choisit de focaliser notre étude sur le périphérique Nord de Lyon. La méthode des prix hédoniques nous permet d'analyser son impact sur l'évolution des prix du marché immobilier de

Ghislaine Deymier

2003-01-01

202

Le nouveau périphérique Nord de Lyon : comment analyser les effets anticipés sur l'évolution du marché foncier et immobilier de l'agglomération lyonnaise ?  

Microsoft Academic Search

Notre étude porte sur la formation du tissu urbain et son étalement spatial à travers l'évolution du marché foncier et immobilier de l'agglomération lyonnaise. La démarche consiste à analyser l'impact de la mise en place d'une nouvelle infrastructure de transport sur l'évolution des prix de ce marché. Le principal objectif est de déceler les éventuelles anticipations qu'elle peut susciter chez

Ghislaine Deymier

2002-01-01

203

Incidence des choix d'exemptions comptables sur la valorisation boursière des sociétés françaises lors de la première application du référentiel IFRS  

Microsoft Academic Search

Cette étude porte sur les choix d'exemptions comptables opérés par les dirigeants des sociétés cotées françaises lors de la première application des normes IFRS. Le but est d'apprécier l'impact de ces choix sur la valorisation boursière de ces entreprises. En effet, aucune étude ne s'est intéressée à la valorisation par le marché des exemptions permises lors de la première adoption

Samira Demaria; Denis Cormier; Robert Teller

2008-01-01

204

Compound heterozygous mutations in the SUR1 (ABCC 8) subunit of pancreatic K(ATP) channels cause neonatal diabetes by perturbing the coupling between Kir6.2 and SUR1 subunits.  

PubMed

KATP channels regulate insulin secretion by coupling ?-cell metabolism to membrane excitability. These channels are comprised of a pore-forming Kir6.2 tetramer which is enveloped by four regulatory SUR1 subunits. ATP acts on Kir6.2 to stabilize the channel closed state while ADP (coordinated with Mg(2+)) activates channels via the SUR1 domains. Aberrations in nucleotide-binding or in coupling binding to gating can lead to hyperinsulinism or diabetes. Here, we report a case of diabetes in a 7-mo old child with compound heterozygous mutations in ABCC8 (SUR1[A30V] and SUR1[G296R]). In unison, these mutations lead to a gain of KATP channel function, which will attenuate the ?-cell response to increased metabolism and will thereby decrease insulin secretion. (86)Rb(+) flux assays on COSm6 cells coexpressing the mutant subunits (to recapitulate the compound heterozygous state) show a 2-fold increase in basal rate of (86)Rb(+) efflux relative to WT channels. Experiments on excised inside-out patches also reveal a slight increase in activity, manifested as an enhancement in stimulation by MgADP in channels expressing the compound heterozygous mutations or homozygous G296R mutation. In addition, the IC 50 for ATP inhibition of homomeric A30V channels was increased ~6-fold, and was increased ~3-fold for both heteromeric A30V+WT channels or compound heterozygous (A30V +G296R) channels. Thus, each mutation makes a mechanistically distinct contribution to the channel gain-of-function that results in neonatal diabetes, and which we predict may contribute to diabetes in related carrier individuals. PMID:22562119

Lin, Yu-Wen; Akrouh, Alejandro; Hsu, YeouChing; Hughes, Nkecha; Nichols, Colin G; De León, Diva D

2012-03-01

205

Evolución costera de un depósito de barrera transgresivo a terraza marina en Isla Coronados, Baja California Sur, México Coastal evolution from transgressive barrier deposit to marine terrace on Isla Coronados, Baja California Sur, Mexico  

Microsoft Academic Search

This contribution describes and discusses the development of the Isla Coronados Pleistocene coastal deposits. The south side of the 700,000-160,000 year-old volcanic cone on Isla Coronados (Baja California Sur, Mexico) forms a shelf that converges on older Miocene andesite from the Comondú Group. Later Pleistocene carbonates accumulated on and around the antecedent topography as related by stratigraphic sections strategically located

J Ledesma-Vázquez; ME Johnson; DH Backus; C Mirabal-Davila

2007-01-01

206

Effets du décocté de Biophytum petersianum (Oxalidaceae) sur la libération du calcium du réticulum sarcoplasmique des cellules musculaires squelettiques  

Microsoft Academic Search

Résumé  Le décocté de la plante entière de Biophytum petersianum (Oxalidaceae) est utilisé dans la médecine traditionnelle au Togo pour traiter l’hypertension artérielle. Le présent travail\\u000a évalue les effets du décocté de la plante entière de Biophytum petersianum sur la libération du calcium stocké dans le réticulum sarcoplasmique des cellules musculaires squelettiques. Les résultats\\u000a ont montré qu’en présence du décocté, la

A. P. Mouzou; S. Titrikou; B. Constantin; S. Sebille; C. Cognard; M. Gbeassor; G. Raymond

2010-01-01

207

ARTIFICIAL NESTING SITES AND OSPREYS AT OJO DE LIEBRE AND GUERRERO NEGRO LAGOONS, BAJA CALIFORNIA SUR, MEXICO  

Microsoft Academic Search

Historically the non-migratory Osprey (Pandion haliaetus) population at the Ojo de Liebre and Guerrero Negro Lagoons, in Baja California Sur, Mexico, was confined to three small islands. In response to the addition of channel markers, electrical and utility poles and many human-made structures in and around the Lagoons during the 1950s, the Ospreys began nesting on suitable artificial structures. Nesting

ARADIT CASTELLANOS; ALFREDO ORTEGA-RUBIO

208

Fiscalité et coût d'usage du capital : incidences sur l'investissement, l'activité et l'emploi  

Microsoft Academic Search

[fre] Une mesure du coût du capital sur données individuelles d’entreprises qui distingue le coût du financement par fonds propres du coût de financement par endettement montre que la dispersion du coût d’usage du capital est relativement élevée. Cette dispersion s’explique, d’une part, par la forte hétérogénéité des structures de financement et, d’autre part, par la variabilité du coût du

Bruno Crépon; Christian Gianella

2001-01-01

209

Les effets à rebours de l'âge de la retraite sur le taux d'emploi des seniors  

Microsoft Academic Search

Comment assurer la pérennité de notre système de retraite par l'allongement de la vie active lorsque moins d'un salarié sur deux parvient aujourd'hui à prendre sa retraite sans passer préalablement par l'inactivité ou le chômage ? Nous montrons dans cet article qu'une partie du problème de l'inactivité des travailleurs âgés avant 60 ans se trouve au contraire dans la faible

Jean-Olivier Hairault; François Langot; Thepthida Sopraseuth

2007-01-01

210

L'impact de valeurs conservatrices et de préjugés racistes sur l'ouverture à l'immigration  

Microsoft Academic Search

La présente étude se démarque des travaux antérieurs en évaluant l'effet respectif du racisme et du conservatisme sur les réactions à l'immigration. Plus précisément, cette étude permet de déterminer la pertinence de ces deux facteurs dans l'estimation d'un seuil d'immigration acceptable. Selon les hypothèses, regroupées dans un modèle de prédiction, le racisme traditionnel est associé au néoracisme et ce dernier

Ann M. Beaton; Francine Tougas; Susan Clayton; Andrea Perrino

2003-01-01

211

Réduction du temps de travail : mise en evidence d’un effet sur l’offre de travail  

Microsoft Academic Search

La réduction du temps de travail, recours accru au temps partiel ou baisse de la durée légale compensée améliore la qualité des offres, ce qui peut accroître l’offre de travail pour chaque niveau de salaire. Cet article étudie ce type d’effets à partir des simulations d’un modèle théorique de prospection d’emploi calibré sur les données individuelles françaises. Les simulations montrent

Muriel PUCCI; Muriel ROGER; Julie VALENTIJN

1999-01-01

212

The LGU Extension Services in a Major Rice-Growing Area: The Case of Hagonoy, Davao del Sur  

Microsoft Academic Search

The province of Davao del Sur is considered one of the major rice-producing provinces of Region XI. It has been regarded as Mindanao’s top rice-yielding province because of its municipality’s (Hagonoy) high yield performance. The study shows that farmers have multiple sources of information within a given farming system. In addition to formal institutions like the national and regional agencies,

Rosa Fe D. Hondrade

2007-01-01

213

OmpA influences Escherichia coli biofilm formation by repressing cellulose production through the CpxRA two-component system  

Microsoft Academic Search

Summary Previously we discovered that OmpA of Escherichia coli increases biofilm formation on polystyrene sur- faces (González Barrios et al., Biotechnol Bioeng, 93:188-200, 2006a). Here we show OmpA influences biofilm formation differently on hydrophobic and hydrophilic surfaces since it represses cellulose pro- duction which is hydrophilic. OmpA increased biofilm formation on polystyrene, polypropylene, and polyvi- nyl surfaces while it decreased

Qun Ma; Thomas K. Wood

2009-01-01

214

Methodologie de conception numerique d'un ventilateur helico-centrifuge basee sur l'emploi du calcul meridien  

NASA Astrophysics Data System (ADS)

La conception de ventilateurs est souvent basée sur une méthodologie « essais/erreurs » d'amélioration de géométries existantes ainsi que sur l'expérience de design et les résultats expérimentaux cumulés par les entreprises. Cependant, cette méthodologie peut se révéler coûteuse en cas d'échec; même en cas de succès, des améliorations significatives en performance sont souvent difficiles, voire impossibles à obtenir. Le projet présent propose le développement et la validation d'une méthodologie de conception basée sur l'emploi du calcul méridien pour la conception préliminaire de turbomachines hélico-centrifuges (ou flux-mixte) et l'utilisation du calcul numérique d'écoulement fluides (CFD) pour la conception détaillée. La méthode de calcul méridien à la base du processus de conception proposé est d'abord présentée. Dans un premier temps, le cadre théorique est développé. Le calcul méridien demeurant fondamentalement un processus itératif, le processus de calcul est également présenté, incluant les méthodes numériques de calcul employée pour la résolution des équations fondamentales. Une validation du code méridien écrit dans le cadre du projet de maîtrise face à un algorithme de calcul méridien développé par l'auteur de la méthode ainsi qu'à des résultats de simulation numérique sur un code commercial est également réalisée. La méthodologie de conception de turbomachines développée dans le cadre de l'étude est ensuite présentée sous la forme d'une étude de cas pour un ventilateur hélico-centrifuge basé sur des spécifications fournies par le partenaire industriel Venmar. La méthodologie se divise en trois étapes: le calcul méridien est employé pour le pré-dimensionnement, suivi de simulations 2D de grilles d'aubes pour la conception détaillée des pales et finalement d'une analyse numérique 3D pour la validation et l'optimisation fine de la géométrie. Les résultats de calcul méridien sont en outre comparés aux résultats de simulation pour la géométrie 3D afin de valider l'emploi du calcul méridien comme outil de prédimensionnement. Mots-clés Turbomachines hélico-centrifuges, Calcul méridien, Simulation numérique d'écoulement fluide, Conception numérique de turbomachines.

Lallier-Daniels, Dominic

215

The Reality of Neandertal Symbolic Behavior at the Grotte du Renne, Arcy-sur-Cure, France  

PubMed Central

Background The question of whether symbolically mediated behavior is exclusive to modern humans or shared with anatomically archaic populations such as the Neandertals is hotly debated. At the Grotte du Renne, Arcy-sur-Cure, France, the Châtelperronian levels contain Neandertal remains and large numbers of personal ornaments, decorated bone tools and colorants, but it has been suggested that this association reflects intrusion of the symbolic artifacts from the overlying Protoaurignacian and/or of the Neandertal remains from the underlying Mousterian. Methodology/Principal Findings We tested these hypotheses against the horizontal and vertical distributions of the various categories of diagnostic finds and statistically assessed the probability that the Châtelperronian levels are of mixed composition. Our results reject that the associations result from large or small scale, localized or generalized post-depositional displacement, and they imply that incomplete sample decontamination is the parsimonious explanation for the stratigraphic anomalies seen in the radiocarbon dating of the sequence. Conclusions/Significance The symbolic artifacts in the Châtelperronian of the Grotte du Renne are indeed Neandertal material culture.

Caron, Francois; d'Errico, Francesco; Del Moral, Pierre; Santos, Frederic; Zilhao, Joao

2011-01-01

216

Abdomen aigu sur une torsion de rate ectopique: ? propos d'un cas  

PubMed Central

La rate ectopique est une entité rare dont l'incidence est mal connue. La torsion de son pédicule est une complication grave, qui doit bénéficier d'un diagnostic précoce; évitant ainsi la splénectomie surtout chez des patients jeunes. Nous rapportons le cas d'une patiente âgée de 39 ans; admise aux urgences dans un tableau d'abdomen aigu chirurgical, l'examen clinique, l’échographie et la tomodensitométrie abdominale ont contribué au diagnostic de torsion d'une rate ectopique en position hypogastrique, la splénectomie a été réalisée devant la découverte peropératoire de taches de nécrose sur la rate tordue. Le diagnostic de torsion d'une rate ectopique doit être suspecté devant l'association d'un abdomen aigu et la palpation d'une masse abdominale. L’échographie et la tomodensitométrie abdominale confirment le diagnostic. Le traitement est chirurgical; il consiste en une splénopexie qui est plus approprié. En présence de nécrose, la splénectomie doit être réalisée aussi bien par voie laparoscopique que par laparotomie.

Khalid, Elhattabi; Fatimazahra, Bensardi; Rachid, Lefriyekh; Abdelaziz, Fadil; Mohamed, Lahkim; Nadia, Benissa; Driss, Khaiz; Saad, Berrada; Najib, Zerouali Ouariti

2012-01-01

217

The two Coissac's novels : l'Envol and Sur la Lune  

NASA Astrophysics Data System (ADS)

Coissac wrote two novels with his friend Charles Rouch.: "L'Envol" in 1934 and "Sur la Lune" in 1935. In these books he describes the preparation of the lunar rocket weigthing 3000 tons and powered by solid propellants. This rocket is launched from a base built at the top of a peruvian volcano. The seven men crew (5 french and one american) is sent to the Moon in a 45 tons command module from which two lunar modules can be separated and can descent to the lunar surface. Coissac describes along the trajectory the means to guide and control the rocket. The exploration of the Moon is done with bicycles ans suits. The explorers meet strange animals and strange people living under ground like termites in perfect love and happiness. After having explored the two faces of the Moon, the lunar modules leave the Moon for a docking with the main vehicle waiting on a lunar orbit and the crew comes back to the Earth. The spacecraft lands in the Pacific Ocean. Except the direct flight from Earth to the Moon, the travel to the Moon proposed by Coissac is very similar to that of Apollo but more than thirty years earlier.

Villain, Jacques

2002-01-01

218

Salinité de la nappe à Greve, Danemark: origine sur la base de données historiques  

NASA Astrophysics Data System (ADS)

Elevated salinity in groundwater (over 250 mg/l chloride) in a fractured chalk aquifer in the municipality of Greve, Denmark, has been attributed to seawater intrusion from the Baltic Sea, resulting in the closure of a number of wells nearest to the coastline. However, a recent study in eastern Denmark shows that the salinity could also be from ancient connate pore waters. Historical chemistry data from bulk-water samples collected from wells have been used to determine the source. The sample data were studied with respect to their historical changes and temporal trends in chloride, carbonate, sulfate, sodium, potassium, magnesium, and calcium. Wells in the southern third of the municipality are relatively low in sodium and carbonate and high in chloride and calcium/magnesium, indicating waters undergoing saline intrusion. Wells in the northern two-thirds of the municipality are high in carbonate and sodium, but low in chloride and calcium/magnesium, indicating a freshening of the aquifer. This is confirmed by the temporal trends in chloride, where chloride levels in the northern wells remain constant, whereas in the south, chloride increases as abstraction continues. Therefore close monitoring for seawater intrusion should be conducted in the southern third of the municipality. La salinité élevée de l’eau de nappe (supérieure à 250 mg/l) dans un aquifère carbonaté fracturé, commune de Greve, Danemark, a été attribuée à une intrusion marine de la Mer Baltique suite à la fermeture d’un certain nombre de puits, les plus proches du rivage. Cependant, une récente étude à l’Est du Danemark montre que la salinité pourrait correspondre à de l’eau interstitielle connée ancienne. Des données chimiques historiques sur un grand nombre d’échantillons d’eau de puits ont été utilisées pour en déterminer la source. L’étude porte sur les variations historiques des concentrations et tendances des chlorures, carbonates, sulfates, sur le sodium, potassium, magnésium et calcium. Les puits du tiers Sud de la commune sont relativement pauvres en sodium et carbonates et riches en chlorures et calcium/magnésium, indiquant des eaux subissant une intrusion saline. Les puits des deux tiers Nord de la commune sont riches en carbonates et en sodium, mais pauvres en chlorures et calcium/magnésium, indiquant un adoucissement de l’aquifère. Ceci est confirmé par les tendances dans le temps, les niveaux de chlorures dans les puits du Nord restant constants, tandis qu’au Sud la concentration en chlorures augmente lorsque l’exhaure se poursuit. C’est pourquoi une surveillance étroite de l’intrusion marine devrait être exercée dans le tiers Sud de la commune. La elevada salinidad en el agua subterránea (más de 250 mg/l de cloruro) en un acuífero de creta fracturada en la municipalidad de Greve, Dinamarca, se ha atribuido a la intrusión de agua salada desde el Mar Báltico, lo que resultó en el cierre de un número de pozos muy cercanos a la línea de costa. Sin embargo, un estudio reciente en el este de Dinamarca muestra que la salinidad podría provenir también desde aguas porales connatas antiguas. Se han usado los datos químicos históricos a partir de los muestreos del agua colectada de los pozos para determinar el origen. Los datos de las muestras fueron estudiados con respecto a sus cambios históricos y tendencias temporales en cloruro, carbonato, sulfato, sodio, potasio, magnesio y calcio. Los pozos en el tercio meridional de la municipalidad son relativamente bajos en sodio y carbonato y altos en cloruro y calcio/magnesio, lo que indica que las aguas experimentan una intrusión salina. Los pozos en las dos terceras partes septentrionales de la municipalidad son altamente carbonatados y sódicos, pero bajos en cloruro y calcio/magnesio, lo que indica una desalinización del agua del acuífero. Esto está confirmado por las tendencias temporales en cloruro, donde los niveles de cloruro en los pozos del norte permanecen constantes, mientras que en el sur el cloruro se incrementa a medid

Thorn, Paul

2010-12-01

219

Uranium-series ages of marine terraces, La Paz Peninsula, Baja California Sur, Mexico  

USGS Publications Warehouse

Uranium-series dating of coral samples from raised marine terrace deposits between 1.5 and 10 m above sea level in the La Paz Peninsula area, Baja California Sur, yielded ages between 123 ka and 138 ka that are in agreement with previously reported results. The stratigraphy and ages of marine units near the El Coyote Arroyo indicate the presence of two high stands of the sea during the last interglacial or oxygen isotope substage 5e at about 140 ka and 123 ka. Accepting 5 m for the sea level during the last interglacial transgression, we calculate average uplift rates for the marine terraces of about ???70 mm/ka and 40 mm/ka. These slow rates of uplift indicate a relative stability of the La Paz peninsula area for the past 140 000 years. In contrast, areas of Baja California affected by major faultf experienced higher rates of uplift. Rockwell et al. (1987) reported vertical uplift rates of 180 to 300 mm/ka at Punta Banda within the Aqua Blanea fault zone in northern Baja California. ?? 1990 Springer-Verlag.

Sirkin, L.; Szabo, B. J.; Padilla, G. A.; Pedrin, S. A.; Diaz, E. R.

1990-01-01

220

Vaccination with Brucella recombinant DnaK and SurA proteins induces protection against Brucella abortus infection in BALB/c mice.  

PubMed

The immunogenicity and protective efficacy of recombinant SurA (rSurA) and rDnaK from Brucella spp. were evaluated in BALB/c mice. Immunization with rSurA in adjuvant induced a vigorous immunoglobulin G (IgG) response, with higher IgG2a than IgG1 titers. In addition, after in vitro stimulation with rSurA, spleen cells from rSurA-immunized mice produced interleukin-2 (IL-2), interferon (IFN)-gamma, IL-4 and IL-5. Immunization with rDnaK plus adjuvant induced a strong humoral response resulting in similar anti-rDnaK IgG titers than immunization with rDnaK alone. IgG2a titers predominated over IgG1 in mice injected with rDnaK alone or rDnaK plus adjuvant. Spleen cells from mice immunized with rDnaK plus adjuvant secreted IFN-gamma and IL-2 upon stimulation with rDnaK and induced a specific cytotoxic response. On the contrary, mice immunized with rDnaK alone did not exhibit a specific T helper or cytotoxic response in vitro. Mice given rSurA or rDnaK with adjuvant exhibited a significant degree of protection whereas immunization with rDnaK alone induced a low but still statistically significant level of protection against B. abortus infection. All studied vaccines were less protected than mice immunized with H38 or B. abortus strain 19 control vaccines. Altogether these results suggest that rSurA or rDnaK induce partial protection against B. abortus infection and could be useful candidates for the development of subunit vaccines against brucellosis. PMID:17686554

Delpino, Maria Victoria; Estein, Silvia Marcela; Fossati, Carlos Alberto; Baldi, Pablo César; Cassataro, Juliana

2007-07-23

221

Proprietes de Transport Electronique DU Rutile Stoechiometrique  

NASA Astrophysics Data System (ADS)

Le rutile est un oxyde metallique qui presente beaucoup de similitudes avec certains perovskites notamment le titanate de barium ou de strontium. Il est comme ces derniers, compose d'un agencement d'octaedres d'oxygene centres sur l'atome de titane. Ces octaedres sont responsables de la forte polarisabilite de ces cristaux et de leur grande constante dielectrique. Leurs proprietes optiques, seuil d'absorption et spectre de phonons, sont par exemple forts semblables. La presente etude vise a determiner la nature du transport electronique dans le rutile stoechiometrique pur et d'en comparer les resultats avec les proprietes de certains perovskites. Nous determinerons par differentes mesures optoelectroniques les parametres caracteristiques des pieges et leur influence sur le transport des electrons et des trous. Les resultats de conductivite et de capacitance de meme que les spectres de photoconductivite dans nos echantillons ont mis en evidence la presence d'au moins cinq niveaux energetiques dans la bande interdite du rutile agissant comme pieges pour les electrons ou pour les trous et qui jouent un role de premiere importance dans le comportement electrique du rutile. Par la technique de charge transitoire, nous determinerons pour la premiere fois dans le rutile stoechiometrique la grandeur de la mobilite de derive des trous a la temperature ambiante soit 3,4 cm^2/V cdots et nous etablierons une borne superieure a la mobilite des electrons soit 0,1 cm^2 /Vcdots.

Keroack, Danielle

222

Simulation de l'accretion de glace sur un obstacle bidimensionnel par la methode des bissectrices et par la modelisation des ruisselets et des gouttes de surface  

NASA Astrophysics Data System (ADS)

Le LIMA (Laboratoire International des Materiaux Antigivre) en collaboration avec le CIRA (Italian Aerospace Research Centre) a developpe un logiciel simulant l'accretion de la glace en regimes sec et humide sur un objet bidimensionnel fixe. L'approche utilisee s'appuie sur les travaux de Lozowski pour les bilans energetiques, sur une etude du comportement du film d'eau, des ruisselets et des gouttes de surface pour le calcul des rugosites et des masses d'eau residuelle, ainsi que sur une methode de bissectrice pour l'evolution de la surface de glace. La contribution du CIRA a ete de fournir le logiciel pour le calcul des ecoulements et de la captation. Le bilan energetique base sur la conservation de l'energie est la sommation de la chaleur latente de fusion, d'evaporation et de sublimation, du rechauffement adiabatique et cinetique, et des pertes de chaleur par convection et conduction, ainsi que de l'evolution thermodynamique de l'eau de son etat initial a son etat final. La densite de la glace, qui a un impact important sur la simulation, est calculee a partir d'une correlation empirique developpee avec les cylindres tournants. En se basant sur les travaux de Al-Khalil et Hansman, le comportement des gouttes en regimes sec et humide a ete decrit analytiquement, ce qui a mene a determiner la hauteur maximale que peuvent atteindre les gouttes avant mouvement. Cette hauteur, appelee hauteur de mouvement, permet de determiner l'etat de l'eau sur la surface (film, ruisselets ou gouttes), ainsi que la hauteur des rugosites lorsque l'eau existe sous forme de gouttes ou de ruisselets. La hauteur de mouvement est determinee par l'equilibre entre les forces de cisaillement, induites par les effets aerodynamiques et gravitationnels evalues pour une goutte non deformee, et la force de cisaillement, induite par la tension de surface et la deformation de la goutte. Elle a ete validee en laboratoire et la precision obtenue pour la partie aerodynamique et gravitationnelle est de 80%. L'etude de la vague qui se forme sur le film a permis de determiner la hauteur des rugosites lorsque l'eau existe sous forme de film. La masse d'eau residuelle est calculee a partir des modeles analytiques elabores selon l'etat de surface et la hauteur de mouvement. (Abstract shortened by UMI.)

Fortin, Guy

223

Sur7 Promotes Plasma Membrane Organization and Is Needed for Resistance to Stressful Conditions and to the Invasive Growth and Virulence of Candida albicans  

PubMed Central

ABSTRACT The human fungal pathogen Candida albicans causes lethal systemic infections because of its ability to grow and disseminate in a host. The C. albicans plasma membrane is essential for virulence by acting as a protective barrier and through its key roles in interfacing with the environment, secretion of virulence factors, morphogenesis, and cell wall synthesis. Difficulties in studying hydrophobic membranes have limited the understanding of how plasma membrane organization contributes to its function and to the actions of antifungal drugs. Therefore, the role of the recently discovered plasma membrane subdomains termed the membrane compartment containing Can1 (MCC) was analyzed by assessing the virulence of a sur7? mutant. Sur7 is an integral membrane protein component of the MCC that is needed for proper localization of actin, morphogenesis, cell wall synthesis, and responding to cell wall stress. MCC domains are stable 300-nm-sized punctate patches that associate with a complex of cytoplasmic proteins known as an eisosome. Analysis of virulence-related properties of a sur7? mutant revealed defects in intraphagosomal growth in macrophages that correlate with increased sensitivity to oxidation and copper. The sur7? mutant was also strongly defective in pathogenesis in a mouse model of systemic candidiasis. The mutant cells showed a decreased ability to initiate an infection and greatly diminished invasive growth into kidney tissues. These studies on Sur7 demonstrate that the plasma membrane MCC domains are critical for virulence and represent an important new target for the development of novel therapeutic strategies.

Douglas, Lois M.; Wang, Hong X.; Keppler-Ross, Sabine; Dean, Neta; Konopka, James B.

2011-01-01

224

Modelisation de la diffusion sur les surfaces metalliques: De l'adatome aux processus de croissance  

NASA Astrophysics Data System (ADS)

Cette these est consacree a l'etude des processus de diffusion en surface dans le but ultime de comprendre, et de modeliser, la croissance d'une couche mince. L'importance de bien mai triser la croissance est primordiale compte tenu de son role dans la miniaturisation des circuits electroniques. Nous etudions ici les surface des metaux nobles et de ceux de la fin de la serie de transition. Dans un premier temps, nous nous interessons a la diffusion d'un simple adatome sur une surface metallique. Nous avons, entre autres, mis en evidence l'apparition d'une correlation entre evenements successifs lorsque la temperature est comparable a la barriere de diffusion, i.e., la diffusion ne peut pas etre associee a une marche aleatoire. Nous proposons un modele phenomenologique simple qui reproduit bien les resultats des simulations. Ces calculs nous ont aussi permis de montrer que la diffusion obeit a la loi de Meyer-Neldel. Cette loi stipule que, pour un processus active, le prefacteur augmente exponentiellement avec la barriere. En plus, ce travail permet de clarifier l'origine physique de cette loi. En comparant les resultats dynamiques aux resultats statiques, on se rend compte que la barriere extraite des calculs dynamiques est essentiellement la meme que celle obtenue par une approche statique, beaucoup plus simple. On peut donc obtenir cette barriere a l'aide de methodes plus precises, i.e., ab initio, comme la theorie de la fonctionnelle de la densite, qui sont aussi malheureusement beaucoup plus lourdes. C'est ce que nous avons fait pour plusieurs systemes metalliques. Nos resultats avec cette derniere approche se comparent tres bien aux resultats experimentaux. Nous nous sommes attardes plus longuement a la surface (111) du platine. Cette surface regorge de particularites interessantes, comme la forme d'equilibre non-hexagonale des i lots et deux sites d'adsorption differents pour l'adatome. De plus, des calculs ab initio precedents n'ont pas reussi a confirmer la forme d'equilibre et surestiment grandement la barriere. Nos calculs, plus complets et dans un formalisme mieux adapte a ce genre de probleme, predisent correctement la forme d'equilibre, qui est en fait due a un relachement different du stress de surface aux deux types de marches qui forment les cotes des i lots. Notre valeur pour la barriere est aussi fortement diminuee lorsqu'on relaxe les forces sur les atomes de la surface, amenant le resultat theorique beaucoup plus pres de la valeur experimentale. Nos calculs pour le cuivre demontre en effet que la diffusion de petits i lots pendant la croissance ne peut pas etre negligee dans ce cas, mettant en doute la valeur des interpretations des mesures experimentales. (Abstract shortened by UMI.)

Boisvert, Ghyslain

225

L'effet des deformations plastiques severes sur les proprietes d'hydruration du magnesium  

NASA Astrophysics Data System (ADS)

Le travail de recherche effectue durant mon projet de maitrise en physique a l'Universite du Quebec a Trois-Rivieres dans les laboratoires de l'Institut de Recherche sur l'Hydrogene etait de comparer l'effet du laminage a froid de la poudre de MgH2 avec celui du broyage mecanique. Nous avons etudie cette nouvelle technique en utilisant un laminoir vertical concu specialement pour laminer de la poudre. Nous avons lamine la poudre de MgH2 5, 25, 50 et 100 fois. La comparaison de la morphologie de la poudre de MgH 2 telle que recu du manufacturier et broye mecaniquement pendant 30 minutes avec celle de la poudre laminee ete faite a l'aide d'un microscope electronique a balayage. Nous avons par la suite mesure les proprietes de sorption d'hydrogene grace un appareil PCT de type Sievert. Nous avons aussi determine la structure cristalline par diffraction de rayons X. A partir de ces resultats, nous avons constate que le nombre optimal de laminages est de cinq et a les caracteristiques d'absorption/desorption d'hydrogene similaires a un broyage mecanique de 30 minutes. Nous avons aussi utilise les courbes de cinetiques d'absorption et de desorption d'hydrogene pour calculer l'etape limitative dans les reactions de sorption des echantillons lamines. Comme cinq laminages se font en environ 10 secondes, on voit que le laminage a froid est une technique plus interessante industriellement que le broyage mecanique a cause de l'important gain en temps et en energie.

Lang, Julien

226

[Spatial and biogeographic characterization of macroalgal assemblages from Bahía del Rincón, Baja California Sur, Mexico].  

PubMed

Macroalgal studies in Baja California Sur have dealt mainly with occurrence and seasonality, but some areas are poorly known even for these basic data. Bahia del Rincón-La Rivera is an important high-productivity fisheries area where coastal infrastructure development is under way. A spatial characterization of the marine flora from Bahia del Rincón-La Rivera was done by intensive sampling at different depths and localities with skin and SCUBA diving. At least 500 m2 were surveyed in each site. Additionally. quantitative sampling was done in ten random 25 cm2 quadrates per site. In the intertidal section, density and cover estimates were used. We also investigated the historical records and geographical affinities. A total of 72 species were identified (most were red algae: 62%). We found no general trend in the biogeographical affinities, which varied with each taxonomic group. Most brown algae species were tropical-endemic; red algae temperate-cosmopolite and green algae tropical-cosmopolite. In the spatial assemblage structure we found a high similarity between the intertidal areas, but a low similarity in shallow or deeper areas (3-5 m). This pattern was the same when we compared the abundance of the main species. We suggest that there are significant spatial differences in recruitment and development of the assemblages in relation to vertical distribution (depth) and position along the shore. There is a clear-cut Gelidium-Jania belt in the intertidal zone and a Padina-Dictyota belt below the low tide. Sporadic and year-round species occur in the intertidal zone, annual and perennial species below the low tide line. Sites differ in recruitment and this affects the abundance of other species (such as coraline and Caulerpa species). Temperature and sedimentation affect seasonality, but community structure is relatively constant throughout the year. PMID:17354423

Riosmena-Rodríguez, R; Hinojosa-Arango, G; López-Vivas, J M; León-Cisneros, K; Holguin-Acosta, E

227

Utilisation de l'ozone pour la valorisation de dechets lignocellulosiques: Influence de l'ozonation sur les constituants parietaux et sur la digestibilite de la paille de ble  

Microsoft Academic Search

This work was designed to investigate the effect of a treatment by ozone on the composition and on the in vitro organic matter digestibility of wheat straw. Ground wheat straw (< 0, 5 mm) was used in this study. Ozonation was performed on dry material and on material which was moistened to 500 % (0–5 g H2O \\/ g of

M. C. Bonnet; J. De Laat; M. Dore; B. Lila

1991-01-01

228

Some cannabinoid receptor ligands and their distomers are direct-acting openers of SUR1 KATP channels  

PubMed Central

Here, we examined the chronic effects of two cannabinoid receptor-1 (CB1) inverse agonists, rimonabant and ibipinabant, in hyperinsulinemic Zucker rats to determine their chronic effects on insulinemia. Rimonabant and ibipinabant (10 mg·kg?1·day?1) elicited body weight-independent improvements in insulinemia and glycemia during 10 wk of chronic treatment. To elucidate the mechanism of insulin lowering, acute in vivo and in vitro studies were then performed. Surprisingly, chronic treatment was not required for insulin lowering. In acute in vivo and in vitro studies, the CB1 inverse agonists exhibited acute K channel opener (KCO; e.g., diazoxide and NN414)-like effects on glucose tolerance and glucose-stimulated insulin secretion (GSIS) with approximately fivefold better potency than diazoxide. Followup studies implied that these effects were inconsistent with a CB1-mediated mechanism. Thus effects of several CB1 agonists, inverse agonists, and distomers during GTTs or GSIS studies using perifused rat islets were unpredictable from their known CB1 activities. In vivo rimonabant and ibipinabant caused glucose intolerance in CB1 but not SUR1-KO mice. Electrophysiological studies indicated that, compared with diazoxide, 3 ?M rimonabant and ibipinabant are partial agonists for K channel opening. Partial agonism was consistent with data from radioligand binding assays designed to detect SUR1 KATP KCOs where rimonabant and ibipinabant allosterically regulated 3H-glibenclamide-specific binding in the presence of MgATP, as did diazoxide and NN414. Our findings indicate that some CB1 ligands may directly bind and allosterically regulate Kir6.2/SUR1 KATP channels like other KCOs. This mechanism appears to be compatible with and may contribute to their acute and chronic effects on GSIS and insulinemia.

Zhou, Qing; Shyng, Show-Ling; Heal, David J.; Cheetham, Sharon C.; Dickinson, Keith; Gregory, Peter; Firnges, Michael; Nordheim, Ulrich; Goshorn, Stephanie; Reiche, Dania; Turski, Lechoslaw; Antel, Jochen

2012-01-01

229

Spectroscopic characterization of atmospheric pressure argon plasmas sustained with the Torche à Injection Axiale sur Guide d'Ondes  

NASA Astrophysics Data System (ADS)

An argon microwave (2.45 GHz) plasma produced by a microwave plasma torch known as "Torche à Injection Axiale sur Guide d'Ondes" (TIAGO) in air ambience at atmospheric pressure was experimentally characterized. The conditions for appropriate TIAGO torch operation in argon and flame morphology were researched under several experimental conditions of gas flow (0.15-5.00 L · min-1) rates and microwave input powers (100-1000 W). Gas temperature and electron density values were studied by means of optical emission spectroscopy. Besides, the processes inside the discharge and their interaction with the surrounding atmosphere were described according to the recorded spectra.

Rincón, R.; Muñoz, J.; Sáez, M.; Calzada, M. D.

2013-03-01

230

Analyse du selenium pur par radioactivation dans les neutrons. Application de la chromatographie par echange d'ions sur resine a l'analyse systematique du selenium  

Microsoft Academic Search

Résumé  La méthode proposée applique, de façon systématique, les séparations par chromatographie sur résines échangeuses d'ions à\\u000a l'analyse des impuretés dans le sélénium. Après dissolution dans un mélange d'acides fluorhydrique et nitrique, la méthode\\u000a permet de séparer—sur des colonnes de résine Dowex I, X=8, 200–400 mesh—les radioisotopes en trois grands groupes comprenant\\u000a chacun 12 à 14 éléments. Différents éluants parachèvent les

E. P. Mignonsin

1974-01-01

231

Anomalously Shallow Paleomagnetic Inclinations of the mid-Turonian Turbidites From Baja California Sur, Mexico  

NASA Astrophysics Data System (ADS)

Paleomagnetic inclinations of sedimentary rocks tend to be biased toward shallower than expected values, probably largely due to post-depositional burial compaction that is controlled by the intrinsic sedimentologic factors such as clay content, grain size, and sedimentary facies. As part of our continued efforts to quantify the sedimentalogical controls on inclination shallowing and thus to correct the shallow inclinations, we have conducted a paleomagnetic and rock magnetic study of the mid-Turonian ( ˜92 Ma) turbidites from Arroyo San Lorenzo (27.0° N, 113.7° W), Baja Californina Sur, Mexico. Fifteen block samples were collected from two 25 cm thick beds, which contain mudstone and siltstone/sandstone layers, within a deep marine sandstone-mudstone turbidite sequence. The two beds are stratigraphically ˜15 m apart and the mudstone layer in the stratigraphically lower bed displays faint laminations. These fine-grained beds were likely deposited from waning turbidity currents. All samples were subjected to either stepwise alternating field (af) demagnetization up to 120 mT or progressive thermal demagnetization up to 650° C. Both the susceptibility and remanence anisotropies were measured to identify and correct shallow inclinations, if any. The 19 mudstone samples from the two beds show similar directions with a mean of Dec=323.3° , Inc=29.3° , k=46.4, ? 95=5.0° and the 44 siltstone/sandstone samples from the two beds yield directions with a mean at Dec=322.4° , Inc=47.1° , k=43.8, ? 95=3.3° in stratigraphic coordinates. The most prominent features of the paleomagnetic results are that both beds yield inclinations shallower than the expected cratonic inclination ( ˜57° ) for the sampling site and the inclinations of the mudstone samples are ˜17° shallower than those of the siltstone/sandstone samples. The disparate inclinations of the mudstone and siltstone/sandstone layers suggest that these rocks carry a primary remanence but the inclinations were likely biased by depositional and/or postdepositional processes and need to be corrected prior to being used for tectonic interpretations. The magnetic susceptibility and remanence data show a predominately oblate fabric with minimum axes perpendicular to the bedding, indicating that the shallow inclinations were caused by compaction and can be corrected by their remanence anisotropies. The ongoing laboratory experiments focus on determining the a factor, the anisotropy of individual magnetic particles, for mudstones and siltstones/sandstones required by the theoretical correction model. The correction of the shallow inclinations will be discussed in the presentation.

Li, Y.; Kodama, K. P.; Smith, D. P.

2004-12-01

232

Challenges and opportunities for implementing sustainable energy strategies in coastal communities of Baja California Sur, Mexico  

NASA Astrophysics Data System (ADS)

This dissertation explores the potential of renewable energy and efficiency strategies to solve the energy challenges faced by the people living in the biosphere reserve of El Vizcaino, which is located in the North Pacific region of the Mexican state of Baja California Sur. This research setting provides a practical analytical milieu to understand better the multiple problems faced by practitioners and agencies trying to implement sustainable energy solutions in Mexico. The thesis starts with a literature review (chapter two) that examines accumulated international experience regarding the development of renewable energy projects as a prelude to identifying the most salient implementation barriers impeding this type of initiatives. Two particularly salient findings from the literature review include the importance of considering gender issues in energy analysis and the value of using participatory research methods. These findings informed fieldwork design and the analytical framework of the dissertation. Chapter three surveys electricity generation as well as residential and commercial electricity use in nine coastal communities located in El Vizcaino. Chapter three summarizes the fieldwork methodology used, which relies on a mix of qualitative and quantitative research methods that aim at enabling a gender-disaggregated analysis to describe more accurately local energy uses, needs, and barriers. Chapter four describes the current plans of the state government, which are focused in expanding one of the state's diesel-powered electricity grids to El Vizcaino. The Chapter also examines the potential for replacing diesel generators with a combination of renewable energy systems and efficiency measures in the coastal communities sampled. Chapter five analyzes strategies to enable the implementation of sustainable energy approaches in El Vizcaino. Chapter five highlights several international examples that could be useful to inform organizational changes at the federal and state level aimed at fostering renewable energy and efficiency initiatives that enhance energy security, protect the environment, and also increase economic opportunities in El Vizcaino and elsewhere in Mexico. Chapter six concludes the thesis by providing: a summary of all key findings, a broad analysis of the implications of the research, and an overview of future lines of inquiry.

Etcheverry, Jose R.

233

Geochemistry of a Tertiary sedimentary phosphate deposit: Baja California Sur, Mexico  

USGS Publications Warehouse

The San Gregorio Formation in Baja California Sur, a phosphate-enriched sedimentary unit of late Oligocene to early Miocene age, has been analyzed in two areas (La Purisima and San Hilario) for its chemical composition (major oxides, Cu, Cd, Cr, Co, V, and rare-earth elements - REE) and isotopic composition (??18O and ??13C). A detrital and a marine component were determined from major oxides. The detrital component consists of an unaltered volcanic-ash fraction and a terrigenous clay-silt fraction. The marine component, which accumulated initially as biogenic and hydrogenous material, is now present as opal-A, opal-CT, CaCO3, organic matter, and an authigenic phosphate fraction, mostly pelletal and composed of the carbonate-fluorapatite mineral francolite. The minor elements have been partitioned into these components by assuming a constant composition for the two detrital fractions. The composition of the marine component of minor elements can then be interpreted by assuming that the stoichiometry of the original accumulating organic matter was equal to that of modern plankton. The Cu and Cd contents in the marine component of all rocks require that the seawater-derived fractions of these two metals were supplied to the seafloor solely by organic matter. Enrichments of Cr and V at both sites required an additional marine input. On the basis of their geochemistry in the modern ocean, Cr and V could have precipitated, or been adsorbed, onto settling particles from an O2 minimum zone in which the O2 content was low enough to promote denitrification rather than oxygen respiration. An enrichment of the REE, now within the apatite fraction, resulted from their adsorption onto particulates also in the O2 minimum zone and to the dissolution and alteration of biogenic phases (predominantly silica) within the sediment. Co and Fe2O3 show no enrichment above a detrital contribution. The ??18O-values of apatites from the La Purisima site are heavier than those of apatites from the San Hilario site, whereas the ??13C-values show the opposite trend. One possible interpretation of these variations is that ??18O reflects seawater values and ??13C sediment pore water values. This interpretation suggests that upwelling rates and primary productivity within the water column were greater at La Purisima, an interpretation that is corroborated by a greater abundance of apatite measured in outcrop at La Purisima. The Ce anomalies of the phosphate-enriched samples also differ between the two sites, indicating that they also recorded water masses, similar to the ??18O-values. ?? 1991.

Piper, D. Z.

1991-01-01

234

QUATERNARY STRUCTURE OF KATP CHANNEL SUR2A NUCLEOTIDE BINDING DOMAINS RESOLVED BY SYNCHROTRON RADIATION X-RAY SCATTERING  

PubMed Central

Heterodimeric nucleotide binding domains NBD1/NBD2 distinguish the ATP-binding cassette protein SUR2A, a recognized regulatory subunit of cardiac ATP-sensitive K+ (KATP) channels. The tandem function of these core domains ensures metabolism-dependent gating of the Kir6.2 channel pore, yet their structural arrangement has not been resolved. Here, purified monodisperse and interference-free recombinant particles were subjected to synchrotron radiation small-angle X-ray scattering (SAXS) in solution. Intensity function analysis of SAXS profiles resolved NBD1 and NBD2 as octamers. Implemented by ab initio simulated annealing, shape determination prioritized an oblong envelope wrapping NBD1 and NBD2 with respective dimensions of 168 × 80 × 37 Å3 and 175 × 81 × 37 Å3 based on symmetry constraints, validated by atomic force microscopy. Docking crystal structure homology models against SAXS data reconstructed the NBD ensemble surrounding an inner cleft suitable for Kir6.2 insertion. Human heart disease-associated mutations introduced in silico verified the criticality of the mapped protein-protein interface. The resolved quaternary structure delineates thereby a macromolecular arrangement of KATP channel SUR2A regulatory domains.

Park, Sungjo; Terzic, Andre

2009-01-01

235

Influence costs and hierarchy  

Microsoft Academic Search

In an internal capital market, individual departments may compete for a share of the firm’s budget by engaging in wasteful influence activities. We show that firms with more levels of hierarchy may experience lower influence costs than less hierarchical firms, even though the former provide more opportunities for exerting influence. The unique influence-cost minimizing hierarchy is strongly asymmetric. With a

Roman Inderst; Holger M. Müller; Karl Wärneryd

2005-01-01

236

Mobilité professionnelle et salaire : des différences entre hommes et femmes  

Microsoft Academic Search

[fre] Mobilité professionnelle et salaire : des différences entre hommes et femmes . Les dix à quinze premières années de carrière ne présentent pas la même rentabilité, sur le plan du salaire, pour les hommes et pour les femmes. Même quand leurs diplômes sont comparables, leurs débuts de carrière le sont rarement - carrière étant entendue comme la succession d'épisodes

Véronique Simonnet

1996-01-01

237

L'intérêt d'un renforcement des fonds propres bancaires (et de mesures complémentaires) pour concilier stabilité financière, performance et bon fonctionnement des banques  

Microsoft Academic Search

Les banques ont entre autres vocations à collecter les dépôts. Ces dépôts représentent leur principale source de financement et jouent un rôle important (à la fois théoriquement et empiriquement) sur leur bon fonctionnement. Il semble donc normal que les banques aient un niveau de levier relativement élevé. Néanmoins, le fort levier des banques génère des externalités négatives pour l'ensemble de

Arthur Petit-Romec

2011-01-01

238

Actes des journees de linguistique: Colloque sur la recherche etudiante (Proceedings of the Linguistics Conference: Colloquium on Student Research) (Quebec, Canada, March 18-19, 1988).  

ERIC Educational Resources Information Center

|Presentations by students at a colloquium on student research on the occasion of the 50th anniversary of the University of Laval's Faculty of Letters, March 18-19, 1988, include: "Une enquete sur la qualite du francais ecrit au Quebec"; "Amenagement linguistique et neologie"; "Analyse syntaxique des 'arrets et retours' en arabe morocain parle";…

Lepage, Danielle, Ed.; Dominik, Annette, Ed.

239

Mule deer density and pattern distribution in the pine-oak forest at the Sierra de La Laguna in Baja California Sur, Mexico  

Microsoft Academic Search

The study of the mule deer (Odocoileus hemionus peninsulae) population was carried out in the relict pine-oak forest of the Sierra de La Laguna in Baja California Sur, Mexico, from July 1987 to March 1989, in order to evaluate the population density with pellet group surveys done in six permanent transects, in July and November 1987, March, June and November

S. Gallina; P. Galina-Tessaro; S. Alvarez-C´rdenas

1991-01-01

240

DIETA ESTACIONAL DEL COYOTE CANIS LATRANS DURANTE EL PERIODO 1996-1997 EN EL DESIERTO DE VIZCAÍNO, BAJA CALIFORNIA SUR, MÉXICO  

Microsoft Academic Search

We studied the diet of the coyote (Canis latrans) in the Vizcaino desert, Baja California Sur, México. The studied was carried out in the summer and winter seasons of 1996 and 1997, respectively. We analized 302 feces and determined 8963 prey items, for 64 animal taxa and 10 of plants. Arthropods were the most frequent prey, representing 95% of identified

Karina M. GRAJALES-TAM; Ricardo RODRÍGUEZ-ESTRELLA; Jorge CANCINO HERNÁNDEZ

2003-01-01

241

Politique salariale et taux d'intérêt en France dans les années 1980 : peut-on envisager de poursuivre sur la lancée ?  

Microsoft Academic Search

[fre] Politique salariale et taux d'intérêt en France dans les années 1980 : peut-on envisager de poursuivre sur la lancée ?. . Après avoir rappelé les grands traits des évolutions macro-économiques et des politiques salariales et de taux menées en France durant les années 1980 et analysé les évolutions les plus récentes, on construit un modèle théorique stylisé pour représenter

Patrick Artus

1992-01-01

242

Gray Whales, 'Eschrichtius robustus', during the 1977-1978 and 1978-1979 Winter Seasons in Laguna San Ignacio, Baja California Sur, Mexico.  

National Technical Information Service (NTIS)

Gray whales, Eschrichtius robustus, were studied at Laguna San Ignacio, Baja California Sur, Mexico during the 1977-1978 and 1978-1979 breeding seasons. Peak populations of approximately 300 whales (not including calves) were reached in February of each y...

S. L. Swartz M. L. Jones

1980-01-01

243

Actes des journees de linguistique: Colloque sur la recherche etudiante (Proceedings of the Linguistics Conference: Colloquium on Student Research) (Quebec, Canada, March 18-19, 1988).  

ERIC Educational Resources Information Center

Presentations by students at a colloquium on student research on the occasion of the 50th anniversary of the University of Laval's Faculty of Letters, March 18-19, 1988, include: "Une enquete sur la qualite du francais ecrit au Quebec"; "Amenagement linguistique et neologie"; "Analyse syntaxique des 'arrets et retours' en arabe morocain parle";…

Lepage, Danielle, Ed.; Dominik, Annette, Ed.

244

Les dimensions de l'organisation du travail  

Microsoft Academic Search

[fre] Dans l'organisation du travail, les cadres et professions intermédiaires s'opposent aux exécutants, ouvriers et employés, par le pouvoir qu'ils exercent sur leur propre travail et sur celui des autres, mais aussi par leur réseau de communications. Celles-ci sont plus variées, plus riches et de plus longue portée pour les cadres que pour les exécutants. Les cadres disposent aussi de

Michel Gollac

1989-01-01

245

Aux origines de la science historique albanaise  

Microsoft Academic Search

Nous commençons, ce semestre, une série d'entretiens avec des historiens qui représentent dans leurs pays des références intellectuelles incontestables mais qui sont encore peu connus des jeunes historiens étrangers. Nous voudrions réfléchir avec eux sur les méthodes qu'ils utilisent ou, comme ici avec M. Aleks Buda, sur leurs parcours parce qu'ils sont représentatifs d'un milieu scientifique national, d'un type de

Marin Haxhimihali

1994-01-01

246

Les comportements de contrôle des mères adolescentes: recension critique de la documentation empirique  

Microsoft Academic Search

L'article fournit une analyse critique de la documentation empirique portant sur l'impact des caractéristiques des mères adolescentes, de leur environnement et de leur enfant sur les comportements de contrôle intrusifs qu'elles exercent envers ce dernier. Les recherches sélectionnées, publiées entre 1980 et 2001 et recensées dans la première section de cet article, identifient plusieurs déterminants des comportements de contrôle qu'adoptent

Ghayda Hassan; Daniel Paquette

2004-01-01

247

L'innovation, facteur de développement de l'industrie alimentaire  

Microsoft Academic Search

[fre] L'évolution des mentalités est rapide, elle entraîne une évolution des comportements sociaux. Le comportement alimentaire rejaillit sur l'ensemble de la politique de développement industriel alimentaire et donc sur la création de produits nouveaux. Ces derniers sont souvent critiqués. On ne peut justifier leur rôle qu'après les avoir réintroduits dans leur contexte général. [eng] Innovation as a development factor in

G. Bragadir

1977-01-01

248

Characterization of Fog Water Collection Potential and Quality on California State University Monterey Bay and Glen Deven Ranch Near Big Sur  

NASA Astrophysics Data System (ADS)

Since June 25, 2005 I have had three standard fog collectors (SFCs) in place at various locales throughout the Greater Monterey Area. From June 25 until July 22, the three SFCs were all located on the California State University Monterey Bay (CSUMB) campus, only a few meters above sea level. Their orientations were all due west. On July 22 two of the SFCs were relocated to a hilly coastal location in Big Sur several hundred meters above sea level known as Glen Deven Ranch. They will remain there until October 15. An SFC is a device that collects fog water from the air. They each consist of a 1 m2 copper frame with a mesh net wound around it. This frame is affixed to two steel posts and is 2 m off the ground. Below the frame sits a trough that has a bottom slanted so that all water in it flows towards a spout at one end. This spout is connected by a tube to a container or data logging rain gauge. Preliminary data analysis shows that maximal collection occurs in the early morning hours at CSUMB and during the evening at Glen Deven Ranch. The weekly volumes of water collected at Glen Deven thus far have been between 2 and 30 times the volume collected on CSUMB. During the time period of operation, the SFCs connected to containers collected 114.37 L in total. The maximum collected for one week is 6.75 L on campus and 19.21 L at the ranch. The data logged by the rain gauge is currently being analyzed to determine how much water has been collected by the SFC it has been connected to. Water from the Glen Deven SFCs and from the CSUMB SFC has been sent to the Santa Clara Municipal Water District where the purity and potability of the water are being investigated. Initially, I wanted to determine about how much water could be obtained in this fashion for use in the Monterey Bay Area. I assumed my results would be broadly applicable, but due to the high variability of fog collection rates I observed even in collectors only a couple hundred of meters apart, any conclusions I draw will likely only apply to the immediate locale the fog collectors are in. This does not trivialize the results, however, because both these places are to be the sites of future construction and the information obtained through this research could influence the immediate developers to choose fog collection technology as their water resource.

Ruiz, G. E.

2005-12-01

249

La stabilisation des jeunes docteurs sur le marché de l'emploi académique  

Microsoft Academic Search

Modes of access to the academic career are generally regarded as crucial element of policy on science and higher education in a country. This can influence the future productivity of teaching and research in different countries. Our research is specifically concerned with the factors that may explain the conditions that lead to integration of researchers and lecturers in the academic

Liliane Bonnal; Jean-François Giret

2009-01-01

250

Convection mixte en régime transitoire de couche limite laminaire sur une plaque verticale  

NASA Astrophysics Data System (ADS)

This work deals with transient laminar boundary layer along a vertical surface and system of equations is solved using finite difference implicite scheme. We show that the nature of the plate influence thermal and dynamical boundary layer thicknesses as well as the flow velocity. Moreover, we observe that a small perturbation of the velocity implies to flow laminar instabilities.

Mai, Ton Hoang; Zebiri, Ryad; Lorenzo, Thierry de

251

Pharmacog?n?tique: qu'en est-il au Maroc?  

PubMed Central

La pharmacogénétique est l’étude de l'influence des variations génétiques interindividuelles sur la réponse aux médicaments, avec le but d'améliorer la prise en charge des patients en visant une médecine personnalisée. Au fait le génome de deux personnes ne diffère que par 0.1% des 3.2 milliards de paires de bases, ce qui implique les effets indésirables des médicaments, qui ont un très important impact sur le plan clinique que sur le plan économique. Or cette dernière décennie ces effets indésirables ont pu être évités grâce aux tests pharmacogénétiques. Au Maroc, la recherche en pharmacogénétique commence à susciter l'intérêt des chercheurs avec quelques études. Une toute première étude en 1986, sur l'acétylation de l'isoniazide chez la population marocaine, suivie par deux autres en 2011 se focalisant sur le métabolisme du tacrolimus et des anti-vitamines K. Ainsi l'espoir maintenant est d'identifier les majoritaires polymorphismes génétiques affectant les patients marocains, afin de leur fournir une prise en charge adaptée.

Idrissi, Meryem Janati; Ouldim, Karim; Amarti, Afaf; El Hassouni, Mohamed; Khabbal, Youssef

2013-01-01

252

Periplasmic peptidyl-prolyl isomerases SurA and FkpA play an important role in the starvation-stress response (SSR) of Salmonella enterica serovar Typhimurium  

PubMed Central

Carbon-energy source (C)-starved cells of Salmonella enterica serovar Typhimurium (S. Typhimurium) are remarkably more resistant to stress than actively growing ones. Carbon-starved S. Typhimurium is capable of withstanding extended periods of starvation and assault from a number of different stresses that rapidly kill growing cells. These unique properties of the C-starved cell are the direct result of a series of genetic and physiological adaptations referred to as the starvation-stress response (SSR). Previous work established that the SSR of S. Typhimurium is partially regulated by the extracytoplasmic function sigma factor ?E. As part of an effort to identify ?E-regulated SSR genes, we investigated surA and fkpA, encoding two different classes of peptidyl-prolyl isomerase that function in folding cell envelope proteins. Both surA and fkpA are members of the heat-shock-inducible ?E regulon of Escherichia coli. Although both genes are expressed in C-starved Salmonella cells, evidence indicates that surA and fkpA are not C-starvation-inducible. Furthermore, their expression during C-starvation does not appear to be ?E-dependent. Nonetheless, surA and fkpA proved to be important, to differing degrees, for long-term C-starvation survival and for the cross-resistance of C-starved cells to high temperature, acidic pH, and the antimicrobial peptide polymyxin B, but neither were required for cross-resistance to oxidative stress. These results point to fundamental differences between heat-shock-inducible and C-starvation-inducible genes regulated by ?E and suggest that genes other than surA and fkpA are involved in the ?E-regulated branch of the SSR in Salmonella.

Humphreys, Sue; Roberts, Mark; Spector, Michael P.

2010-01-01

253

The Virulence Factor PEB4 (Cj0596) and the Periplasmic Protein Cj1289 Are Two Structurally Related SurA-like Chaperones in the Human Pathogen Campylobacter jejuni*  

PubMed Central

The PEB4 protein is an antigenic virulence factor implicated in host cell adhesion, invasion, and colonization in the food-borne pathogen Campylobacter jejuni. peb4 mutants have defects in outer membrane protein assembly and PEB4 is thought to act as a periplasmic chaperone. The crystallographic structure of PEB4 at 2.2-Å resolution reveals a dimer with distinct SurA-like chaperone and peptidyl-prolyl cis/trans isomerase (PPIase) domains encasing a large central cavity. Unlike SurA, the chaperone domain is formed by interlocking helices from each monomer, creating a domain-swapped architecture. PEB4 stimulated the rate of proline isomerization limited refolding of denatured RNase T1 in a juglone-sensitive manner, consistent with parvulin-like PPIase domains. Refolding and aggregation of denatured rhodanese was significantly retarded in the presence of PEB4 or of an engineered variant specifically lacking the PPIase domain, suggesting the chaperone domain possesses a holdase activity. Using bioinformatics approaches, we identified two other SurA-like proteins (Cj1289 and Cj0694) in C. jejuni. The 2.3-Å structure of Cj1289 does not have the domain-swapped architecture of PEB4 and thus more resembles SurA. Purified Cj1289 also enhanced RNase T1 refolding, although poorly compared with PEB4, but did not retard the refolding of denatured rhodanese. Structurally, Cj1289 is the most similar protein to SurA in C. jejuni, whereas PEB4 has most structural similarity to the Par27 protein of Bordetella pertussis. Our analysis predicts that Cj0694 is equivalent to the membrane-anchored chaperone PpiD. These results provide the first structural insights into the periplasmic assembly of outer membrane proteins in C. jejuni.

Kale, Avinash; Phansopa, Chatchawal; Suwannachart, Chatrudee; Craven, C. Jeremy; Rafferty, John B.; Kelly, David J.

2011-01-01

254

Testosterone protects female embryonic heart H9c2 cells against severe metabolic stress by activating estrogen receptors and up-regulating IES SUR2B.  

PubMed

A recent clinical study demonstrated that a testosterone supplementation improves functional capacity in elderly female patients suffering from heart failure. These findings prompted us to consider possible mechanisms of testosterone-induced cardioprotection in females. To address this question we have used a pure female population of rat heart embryonic H9c2 cells. Pre-treatment of cells with testosterone for 24h significantly increased survival of H9c2 cells exposed to 2,4-dinitrophenol (DNP), an inhibitor of oxidative phosphorylation. These cells expressed low level of androgen receptors and the effect of testosterone was not modified by hydroxyflutamide, an antagonist of androgen receptor. In contrast, cyclohexamide, an inhibitor of protein biosynthesis, and tamoxifene, a partial agonist of estrogen receptors, abolished cardioprotection afforded by testosterone. In addition, finasteride, an inhibitor of 5?-reductase, and anastrazole, an inhibitor of ?-aromatase, also blocked testosterone-induced cytoprotection. Real time RT-PCR revealed that testosterone did not regulate the expression of nine subunits and accessory proteins of sarcolemmal ATP-sensitive K(+) (K(ATP)) channels. On the other hand, testosterone, as well as 17?-estradiol, up-regulated a putative mitochondrial K(ATP) channel subunit, mitochondrial sulfonylurea receptor 2B intraexonics splice variant (IES SUR2B), without affecting expression of IES SUR2A. Tamoxifene inhibited testosterone-induced up-regulation of IES SUR2B without affecting IES SUR2A. In conclusion, this study has shown that testosterone protect female embryonic heart H9c2 cells against severe metabolic stress by its conversion into metabolites that activate estrogen receptors and up-regulate IES SUR2B. PMID:23085378

Ballantyne, Thomas; Du, Qingyou; Jovanovi?, Sofija; Neemo, Andrew; Holmes, Robert; Sinha, Sharabh; Jovanovi?, Aleksandar

2012-10-22

255

Impact des produits de lessivage de feuilles mortes sur la teneur en oxygène de l'eau et sur la survie d'un gastéropode  

NASA Astrophysics Data System (ADS)

The impact of the leaching of oleander, Nerium oleander, and willow, Salix pedicellata, leaves on the aquatic environment was investigated in the laboratory. The leaves were collected on the banks of a Moroccan stream, leachate polyphenols were analysed, and leachate toxic effects on the dominant gastropod species of the stream were investigated. The following factors were considered: leaf species, dry or fresh state of the leaves, litter concentration, duration of leaching, temperature. Within the first 8-12 hrs of submersion, the litter of both species caused a great depletion of dissolved oxygen. Later, oxygen consumption decreased. Dry oleander leaves caused a greater drop in oxygen concentration than fresh oleander leaves. The opposite was observed in willow leaves, most clearly at 5 and 10°C. At higher temperatures (20 and 25°C), oxygen nearly totally disappeared under all conditions, leaving 0 to 2 mg.I -1 after 48 hours. Whether fresh or dry, oleander leaves always caused a greater oxygen depletion than willow leaves. Willow leaves contained more tannin-and non-tannin-polyphenols than oleander leaves, and their leaching released more of these compounds, especially in dry leaves. The leaching of both leaf species only had a toxic effect on the gastropods at the higher temperatures (20 and 25°C), thus suggesting that the toxic effect was mainly due to lack of oxygen in the water. At these temperatures, the toxic effect of dry leaves was greater than that of fresh leaves. Oleander proved more toxic than willow, presumably under the influence of both lack of oxygen and toxic heterosides.

Chergui, H.; Haddy, L.; Markaoui, M.; Pattee, E.

256

Les phlébotomes et leur rôle dans la transmission des leishmanioses  

Microsoft Academic Search

This paper deals with phlebotomine sandflies morphology, geographical distribution, biology and transmission of leishmaniases, methods of investigation and fight. It includes illustrations and a simplified key for generic and sub-generic diagnosis.

Nicole Léger; Jérôme Depaquit

2001-01-01

257

L'horizon des jeunes salariés dans leur entreprise  

Microsoft Academic Search

[fre] Un peu plus du tiers des jeunes actifs de 16 à 26 ans désirent rester dans l'entreprise qui les emploie au-delà des trois années à venir, et pensent que c'est possible. Cette proportion estimée à l'enquête Emploi de mars 1 986, permet d'approcher ce que l'on peut appeler « l'horizon de la relation de travail ». On peut supposer

Jean-Pierre Jarousse; Michel Glaude

1988-01-01

258

On Resisting Social Influence.  

National Technical Information Service (NTIS)

Resisting social influences becomes important when such influences can be appropriately thought of as 'mind control.' When information is systematically hidden, withheld or distorted it is impossible to make unbiased decisions. Under these circumstances, ...

S. Andersen P. Zimbardo

1979-01-01

259

Histoire végétale d'une tourbière littorale : le Marais des Bourbes (Olonne-sur-Mer, Vendée)  

Microsoft Academic Search

To the north of the town of Sables d'Olonne, the palaeo-environmental study of the Marais des Bourbes (located 46°33?N, 1°49?W, +4 m NGF) by means of paleopalynology, enabled us to reveal a number of different ecosystems (maritime, continental and anthropic) in this one small peat bog. A study of the salt and fresh water plants shows the alternate influence of

Camille Joly

2004-01-01

260

Antecedents of Influence Outcomes  

Microsoft Academic Search

Influence incidents described either by agents or targets were coded for the presence of 9 influence tactics, and the outcome was coded in terms of commitment, compliance, or resistance. Agent power and content factors for an incident were measured with a short questionnaire. This study is the first to show that influence tactics, agent power, and content factors independently affect

Gary Yukl; Helen Kim; Cecilia M. Falbe

1996-01-01

261

Peer Influence and Recovery  

ERIC Educational Resources Information Center

Research has shown that peer influence can be negative, by increasing the likelihood that a youth will engage in high-risk behaviors and make risky decisions. However, peer influence can also be positive and protect a youth from these same high-risk activities. This article examines the extent of peer influence and then describes the Alternative…

Collier, Crystal; Simpson, Shelly; Najera, John; Weiner, Lauren

2012-01-01

262

Peer Influence and Recovery  

ERIC Educational Resources Information Center

|Research has shown that peer influence can be negative, by increasing the likelihood that a youth will engage in high-risk behaviors and make risky decisions. However, peer influence can also be positive and protect a youth from these same high-risk activities. This article examines the extent of peer influence and then describes the Alternative…

Collier, Crystal; Simpson, Shelly; Najera, John; Weiner, Lauren

2012-01-01

263

N-terminal transmembrane domain of SUR1 controls gating of Kir6.2 by modulating channel sensitivity to PIP2  

PubMed Central

Functional integrity of pancreatic adenosine triphosphate (ATP)-sensitive potassium (KATP) channels depends on the interactions between the pore-forming potassium channel subunit Kir6.2 and the regulatory subunit sulfonylurea receptor 1 (SUR1). Previous studies have shown that the N-terminal transmembrane domain of SUR1 (TMD0) interacts with Kir6.2 and is sufficient to confer high intrinsic open probability (Po) and bursting patterns of activity observed in full-length KATP channels. However, the nature of TMD0–Kir6.2 interactions that underlie gating modulation is not well understood. Using two previously described disease-causing mutations in TMD0 (R74W and E128K), we performed amino acid substitutions to study the structural roles of these residues in KATP channel function in the context of full-length SUR1 as well as TMD0. Our results revealed that although R74W and E128K in full-length SUR1 both decrease surface channel expression and reduce channel sensitivity to ATP inhibition, they arrive there via distinct mechanisms. Mutation of R74 uniformly reduced TMD0 protein levels, suggesting that R74 is necessary for stability of TMD0. In contrast, E128 mutations retained TMD0 protein levels but reduced functional coupling between TMD0 and Kir6.2 in mini-KATP channels formed by TMD0 and Kir6.2. Importantly, E128K full-length channels, despite having a greatly reduced Po, exhibit little response to phosphatidylinositol 4,5-bisphosphate (PIP2) stimulation. This is reminiscent of Kir6.2 channel behavior in the absence of SUR1 and suggests that TMD0 controls Kir6.2 gating by modulating Kir6.2 interactions with PIP2. Further supporting this notion, the E128W mutation in full-length channels resulted in channel inactivation that was prevented or reversed by exogenous PIP2. These results identify a critical determinant in TMD0 that controls Kir6.2 gating by controlling channel sensitivity to PIP2. Moreover, they uncover a novel mechanism of KATP channel inactivation involving aberrant functional coupling between SUR1 and Kir6.2.

Pratt, Emily B.; Tewson, Paul; Bruederle, Cathrin E.; Skach, William R.

2011-01-01

264

N-terminal transmembrane domain of SUR1 controls gating of Kir6.2 by modulating channel sensitivity to PIP2.  

PubMed

Functional integrity of pancreatic adenosine triphosphate (ATP)-sensitive potassium (K(ATP)) channels depends on the interactions between the pore-forming potassium channel subunit Kir6.2 and the regulatory subunit sulfonylurea receptor 1 (SUR1). Previous studies have shown that the N-terminal transmembrane domain of SUR1 (TMD0) interacts with Kir6.2 and is sufficient to confer high intrinsic open probability (P(o)) and bursting patterns of activity observed in full-length K(ATP) channels. However, the nature of TMD0-Kir6.2 interactions that underlie gating modulation is not well understood. Using two previously described disease-causing mutations in TMD0 (R74W and E128K), we performed amino acid substitutions to study the structural roles of these residues in K(ATP) channel function in the context of full-length SUR1 as well as TMD0. Our results revealed that although R74W and E128K in full-length SUR1 both decrease surface channel expression and reduce channel sensitivity to ATP inhibition, they arrive there via distinct mechanisms. Mutation of R74 uniformly reduced TMD0 protein levels, suggesting that R74 is necessary for stability of TMD0. In contrast, E128 mutations retained TMD0 protein levels but reduced functional coupling between TMD0 and Kir6.2 in mini-K(ATP) channels formed by TMD0 and Kir6.2. Importantly, E128K full-length channels, despite having a greatly reduced P(o), exhibit little response to phosphatidylinositol 4,5-bisphosphate (PIP(2)) stimulation. This is reminiscent of Kir6.2 channel behavior in the absence of SUR1 and suggests that TMD0 controls Kir6.2 gating by modulating Kir6.2 interactions with PIP(2). Further supporting this notion, the E128W mutation in full-length channels resulted in channel inactivation that was prevented or reversed by exogenous PIP(2). These results identify a critical determinant in TMD0 that controls Kir6.2 gating by controlling channel sensitivity to PIP(2). Moreover, they uncover a novel mechanism of K(ATP) channel inactivation involving aberrant functional coupling between SUR1 and Kir6.2. PMID:21321069

Pratt, Emily B; Tewson, Paul; Bruederle, Cathrin E; Skach, William R; Shyng, Show-Ling

2011-02-14

265

Synthesis of mono functional carboxylic acid poly(methyl methacrylate) in aqueous medium using sur-iniferter. Application to the synthesis of graft copolymers polyethylene- g-poly(methyl methacrylate) and the compatibilization of LDPE\\/PVDF blends  

Microsoft Academic Search

Carboxylic acid mono functional poly(methyl methacrylate) was prepared by emulsion photopolymerization using 4-diethylthiocarbamoylsulfanylmethyl benzoic acid (DTBA) as sur-iniferter agent. DTBA is efficient to obtain mono functional polymers with a linear evolution of Mn vs. monomer conversion up to 60%. Beyond 60% monomer conversion, Mn decreases drastically and addition of a supplementary surfactant seems to disturb the effect of sur-iniferter. Secondly,

J. Kwak; P. Lacroix-Desmazes; J. J. Robin; B. Boutevin; N. Torres

2003-01-01

266

Influence de l'alteration physique sur les caracteristiques physico-chimiques de monolithes de sols contamines traites par stabilisation/solidification au ciment  

NASA Astrophysics Data System (ADS)

The concern of contaminated sites is affecting millions of property owner worldwide. As they pose a risk to the environment, human health or impair the value of buildings, remediation of contaminated sites has become an everyday issue. Stabilization/solidification (S/S) of contaminated soils with cement is a remediation technology that was developed to confine contaminants that cannot be degraded biologically, chemically or thermally by other technologies. Soils treated with S/S form a monolith that can be valorized on site. However, this practice is fairly uncommon in Quebec and this reluctance is partly due to the risks of degradation of the monoliths and the lack of knowledge relative to the long-term behavior of altered monoliths. The objective of this project was to simulate these degradations on cement-based monoliths of contaminated soils treated with S/S technology by causing physical alterations using different cycles of freeze/thawing and drying/wetting, and then to study the impact of these alterations on the mass losses, compressive strength, hydraulic conductivity, pH and leachability of five trace metals (Cd, Cr, Cu, Pb and Zn) used as contaminants. Various processes of S/S have been studied, either cement contents of 15 and 20%, then the presence of 5% by weight of calcium carbonate. For each S/S process formulated, the freeze/thaw cycles were much more effective in physically altering the monoliths. These alterations were mainly reflected by lower compressive strength, even more with lower cement contents. For their part, the drying/wetting cycles rather created a chemical change that lowered the pH of the monoliths. These chemical changes also affected the interpretation of leaching test results, especially for copper and zinc, since it was difficult to attribute effects to either physical or chemical alterations. The results showed that only chromium leached more clearly in response to physical alterations. All other elements studied were little affected, even though some samples were highly altered. This demonstrates that in some cases, damages may have little impact on long-term performance of the monoliths in terms of contaminant immobilization. However, integrating the study of long-term behaviors of monoliths in a process of formulation for contaminated soil treatment with S/S can become paramount, as seen for chromium in this present study. Keywords: stabilization / solidification, deterioration, alteration, leachability, contaminants.

Remillard, Jonathan

267

Etude de l'influence du milieu environnant sur la composition minérale d'une rivière marocaine en utilisant l'activation neutronique et l'ICP\\/MS  

Microsoft Academic Search

Instrumental neutron activation analysis (INAA) and inductively coupled plasma\\/mass spectrometry (ICP\\/MS) have been performed to study the degree of contamination due to toxic heavy metals and other pollutants in water and sediments of a Moroccan river. Water and sediments samples have been collected from seven locations from this river along 41 km, as shown in Fig. 1.The sediment samples were

M Khalis; A Sekkaki; J. L Irigaray; F Carrot; G Revel

1997-01-01

268

Influence de l'adaptation au travail à la chaleur sur l'évolution de la température rectale au cours de la récupération  

Microsoft Academic Search

Summary  Evolution of rectal temperature (T\\u000a\\u000are\\u000a) during recovery in different air temperatures was studied following different patterns of heat load before and after adaptation to work in heat (10 consecutive days). Three subjects have been exposed, after a 30 min rest period (T\\u000a\\u000aa\\u000a = 28 C, P\\u000a\\u000awa\\u000a = 14 mb) to 4 heat loads, each producing 1

V. Candas; J. J. Vogt; A. Hoeft; J. P. Libert

1977-01-01

269

Influence du taux d'humidité et de traitements de surface (laser et implantations d'ions) sur la corrosion atmosphérique de matériaux utilisés en connectique (nickel doré)  

NASA Astrophysics Data System (ADS)

The first part of this work is a qualitative and quantitative study of the corrosion of a material, constituted of brass covered with an electrochemical nickel coating (thickness ?5~?m) and with a gold coating (thickness ?0.4~?m or ?1~?m), used in electrical contact applications. Tests of corrosion have been carried out in the humid synthetic air (humidity ratio varying from 15% to 90%) containing low contents of NO2 (0.2 vpm), SO2 (0.2 vpm) and Cl2 (0.01 vpm). The reactivity of the material has been studied as a function of the humidity ratio. The obtained results show that the corrosion products are well localised on the surface. The clusters formed are principally constituted of nitrate, sulphate, chloride and hydroxide of nickel and zinc. The quantity of the products formed, and the ratio of sulphate, increases with the humidity ratio. In return, the ratio Zn/Ni increases in the products formed when the humidity ratio decreases. The compounds formed have been identified by a process developed in our laboratory associating ionic chromatography, microgravimetry, atomic absorption and X rays analysis. These studies have shown that the protection of the nickel by the gold requires a deposit of gold perfectly tight. It seems that, very often, the porosities responsible of these localised corrosion cross the layer of gold and nickel together, leading to the galvanic corrosion of the zinc. The scanning electron microscopy associated with X ray analysis (SEM/EDS) have shown the presence of carbon in these porosities, probably bound to the presence of organic compounds in the electrolytic coating baths. During the galvanic corrosion of nickel and zinc, the carbon is rejected to the periphery of the germs. The amount of carbon has been determined by Van De Graaff analysis. In the second part of this work, some treatments of the material by high energy beams (laser or ion implantation (titanium or titanium and nitrogen or helium)) have been realised in order to suppress the porosities of the gold layer. These treatments lead to a remarkable improvement of the corrosion resistance of the material. La première partie de ce travail est une étude qualitative et quantitative de la corrosion d'un matériau utilisé en connectique, constitué de laiton recouvert d'un dépôt de nickel électrochimique de 5 ?m et d'un dépôt d'or de 0,4 ?m ou de 1 ?m. Les essais de corrosion ont été conduits dans de l'air synthétique humide (taux d'humidité variable entre 15 % et 90 %) contenant de faibles quantités de NO2 (0,2 vpm), SO2 (0,2 vpm), Cl2 (0,01 vpm). Le comportement du matériau en fonction du taux d'humidité a été étudié. Les résultats obtenus montrent que les produits de corrosion croissent sous forme d'amas bien localisés. Ces amas sont constitués principalement de nitrates, sulfates, chlorures et hydroxydes de nickel et de zinc. La quantité de produits formés et la proportion de sulfates croissent avec le taux d'humidité. En revanche, le rapport zinc/nickel croît lorsque le taux d'humidité diminue. Nous avons identifié les composés formés, essentiellement grâce à une méthode développée au laboratoire associant la microgravimétrie, la chromatographie ionique et l'absorption atomique, et également par analyse X. Ces études ont montré que la protection du nickel par l'or exige un dépôt d'or parfaitement étanche. Il semble que très souvent les porosités responsables de l'apparition d'une corrosion traversent à la fois la couche d'or et de nickel, entraînant l'attaque du zinc par corrosion galvanique. Les analyses effectuées au MEB ont permis de montrer qu'il existait probablement dans ces porosités des composés organiques liés à l'élaboration de ces couches et que lors de l'attaque galvanique du nickel et du zinc, le carbone est rejeté à la périphérie des amas. La quantité de carbone présent dans la couche a pu être déterminée par des analyses nucléaires réalisées au Van De Graaff. Dans la deuxième partie de ce travail, différents traitements de surface par faisceaux

Perrin, C.; Simon, D.

1999-07-01

270

Influence d'une substitution partielle du ciment par du laitier de hauts fourneaux sur la résistance des mortiers en milieu acide  

NASA Astrophysics Data System (ADS)

Le stockage de produits chimiques dans du béton présente souvent des problèmes de durabilité dus aux attaques chimiques. Inévitablement les concentrations élevées sont les plus dangereuses. Le but de notre étude est de déterminer les changements de phases qui apparaissent dans le béton lorsqu'on substitue une partie du ciment par du laitier de haut fourneaux. Les échantillons sont conservés dans des solutions acides différents anions (HCl, H{2}SO{4}, H{3}PO{4} et CH{3}COOH) et différentes concentrations (0,1; 0,25 et 0,5M). Les formations qui apparaissent sont déterminées par diffraction X et observées au MEB. Les solutions sulfatiques conduisent à une formation de gypse en surface et d'ettringite au contact de la matrice cimentaire. Avec l'acide acétique, il y a formation de calcium acétate hydrate sous forme spongieuse tandis que, avec l'acide phosphatique, la formation de calcium hydrogeno phosphate hydrate est très superficielle. Enfin, avec l'acide chlorhydrique, la surface du mortier est recouverte de chlorure de calcium dihydrate et d'hydroxyde de fer. Les résistances mécaniques sont plus ou moins affectées par la concentration mais aussi et surtout par la nature des acides avec dans l'ordre le plus agressif H{2}SO{4} puis HCl et CH{3}COOH enfin peu de modification pour H{3}PO{4}.

Achoura, D.; Lanos, Ch.; Jauberthie, R.; Redjel, B.

2004-11-01

271

Influence d'une substitution partielle du ciment par du laitier de hauts fourneaux sur la résistance des mortiers en milieu acide  

Microsoft Academic Search

Le stockage de produits chimiques dans du béton présente souvent des problèmes de durabilité dus aux attaques chimiques. Inévitablement les concentrations élevées sont les plus dangereuses. Le but de notre étude est de déterminer les changements de phases qui apparaissent dans le béton lorsqu'on substitue une partie du ciment par du laitier de haut fourneaux. Les échantillons sont conservés dans

D. Achoura; Ch. Lanos; R. Jauberthie; B. Redjel

2004-01-01

272

Caractérisation de la surface du polydicyclopentadiène (Poly-DCPD) : influence du vieillissement sur le mouillage et l'adhésion de peinture  

NASA Astrophysics Data System (ADS)

This paper deals with the surface study of an industrial polydicyclopentadiene. First, the chemical structure of this polymer is presented. Then the contact angle measurements between the solid surface and various liquids are discussed. Surface energy value is 48 mJ/m2 for total energy and 3 mJ/m2 for the polar component. During ageing, surface polarity increases leading to a good paint adhesion and a great affinity for water. However, weak boundary layers formation is possible and discussed in the last part of this paper. Cet article concerne l'étude de la surface d'un polydicyclopentadiène industriel. Il débute par une brève présentation de la structure chimique de ce polymère. Les conditions de mesure de l'angle de contact de différents liquides et des tests d'adhésion sont précisées et mises au point. L'énergie de surface est de l'ordre de 48 mJ/m2 et comporte une faible composante polaire (3 mJ/m^2). Au cours du vieillissement, la polarité de surface augmente ce qui est à l'origine de la bonne adhésion des peintures et d'une grande affinité pour l'eau. Cependant dans certaines conditions il peut y avoir formation de couches de faible cohésion défavorable à l'accrochage.

Perwuelz, A.; Campagne, C.; Lam, T. M.

1999-05-01

273

Influence de divers types d’obésité expérimentale sur la résistance de la souris à ľinfection par Salmonella typhimurium et Klebsiella pneumoniae  

Microsoft Academic Search

Resistance to infections inducing two types of immune response, humoral and cell-mediated, has been measured in mice after Salmonella typhimurium and Klebsiella pneumoniae inoculation; the animals exhibited different kinds of obesity: genetic, ob\\/ob and db\\/db mutants, induced by fat diet or gold thioglucose (aurothioglucose) injection (determining obesity of central origin). Klebsiella infection was aggravated in all types of obesity. Salmonella

G. A. Conge; P. Gouache; Y. Joyeux; J. Goichot; J. M. Fournier

1988-01-01

274

Influence of the atmospheric humidity on the behaviour of silicon AFM probes in photon scanning tunneling microscopy  

NASA Astrophysics Data System (ADS)

The photon scanning tunneling microscopy (PSTM) allows to characterize the surface topography with high resolution. This microscopy exploits the exponential decay of the evanescent field achieved by the total internal reflection under the surface sample. When the distance between the sensor and the surface becomes small (sim 100 nm), the non propagating photons of the evanescent field can be converted into guided propagating mode of polaritons. A bulk Silicon probe is used in the AFM experiment as a sensor of van der Waals forces. The aim of this paper is to discuss the influence of the atmospheric humidity on the PSTM measurements. We have showed that the theoretical predictions of the dielectrical capture model (DCM) are very different from the experimental results when the humidity level is higher than a threshold value (30%). We present the results obtained with TE polarization, but the same behaviour is found with TM polarization. Although, in this paper we do not propose a theoretical model explaining the deviations between DCM values and experimental, however we found a validity threshold for our experimental results and we have emited the assumption that under high humidity level the pollution film presents on the sample surface slide during the displacement of the probe. La microscopie optique à effet tunnel (PSTM) est un outil de caractérisation de surface à haute résolution. Ce microscope exploite la décroissance du champ évanescent créé sur la surface de l'échantillon. Quand la distance entre le capteur et la surface est de quelques dizaines de nanomètres, les ondes évanescentes créées sur la surface sont converties en ondes propagatives et détectées en champ lointain. Le capteur est une sonde en silicium utilisée en microscopie à force atomique. Cet article montre l'influence des conditions atmosphériques sur les mesures PSTM. Il montre qu'au-delà d'un certain taux d'humidité (30%), les mesures ne sont plus valables et ne suivent plus les prédictions du modèle de capture diélectrique (DCM). Bien que nous ne proposions pas d'interprétation théorique à ces altérations, nous émettons l'hypothèse que cela est dû aux mouvements des molécules du film présent sur la surface de l'échantillon. De même, nous établissons un seuil de validité aux mesures optiques.

Benfedda, M.; Lahimer, S.; Bonnafe, J.

1998-11-01

275

Effet du rayonnement solaire sur la persistance des conidiospores de L'hyphomycète entomopathogène, Nomuraea rileyi , à la surface d'un couvert végétal  

Microsoft Academic Search

Résumé  La persistance des conidiospores deNomuraea rileyi (F.) Samson à la surface du couvert végétal a été étudiéein situ en culture de féverole («Féverole 1 et 2») et de chou. L'effet du rayonnement solaire sur la survie du germe a été analysé,\\u000a d'une part, dans des microparcelles recouvertes d'écrans sélectifs arrêtant les radiations de longueurs d'onde inférieures\\u000a à 320 nm (UV

J. Fargues; M. Rougier; R. Goujet; B. Itier

1988-01-01

276

Periplasmic Peptidyl Prolyl cis-trans Isomerases Are Not Essential for Viability, but SurA Is Required for Pilus Biogenesis in Escherichia coli  

Microsoft Academic Search

In Escherichia coli, FkpA, PpiA, PpiD, and SurA are the four known periplasmic cis-trans prolyl isomerases. These isomerases facilitate proper protein folding by increasing the rate of transition of proline residues between the cis and trans states. Genetic inactivation of all four periplasmic isomerases resulted in a viable strain that exhibited a decreased growth rate and increased susceptibility to certain

Sheryl S. Justice; David A. Hunstad; Jill Reiss Harper; Amy R. Duguay; Jerome S. Pinkner; James Bann; Carl Frieden; Thomas J. Silhavy; Scott J. Hultgren

2005-01-01

277

Thermomechanical maturation of the continental crust and its effects on the Late Eocene–Early Oligocene volcanic record of the Sierra Madre del Sur Province, southern Mexico  

Microsoft Academic Search

We interpret the voluminous late Eocene–early Oligocene volcanic successions of the north-central Sierra Madre del Sur as the eruptive manifestation of a progressive thermomechanical maturation of the crust, driven by sustained igneous activity that affected the region since the early Eocene. Widespread Eocene magmatism and injection of mantle-derived melts into the crust beneath the Michoacán-Puebla area promoted the development of

Laura Mori; Dante J. Morán-Zenteno; Barbara M. Martiny; Enrique A. González-Torres; María Chapela-Lara; Beatriz A. Díaz-Bravo; Julie Roberge

2011-01-01

278

Thermomechanical maturation of the continental crust and its effects on the late Eocene–early Oligocene volcanic record of the Sierra Madre del Sur Province, southern Mexico  

Microsoft Academic Search

We interpret the voluminous late Eocene–early Oligocene volcanic successions of the north-central Sierra Madre del Sur as the eruptive manifestation of a progressive thermomechanical maturation of the crust, driven by sustained igneous activity that affected the region since the early Eocene. Widespread Eocene magmatism and injection of mantle-derived melts into the crust beneath the Michoacán-Puebla area promoted the development of

Laura Mori; Dante J. Morán-Zenteno; Barbara M. Martiny; Enrique A. González-Torres; María Chapela-Lara; Beatriz A. Díaz-Bravo; Julie Roberge

2012-01-01

279

Questions Sur la Diffusion de l'Esprit du Lieu : Le Cas des Routes Culturelles en Europe du Sud-Est  

Microsoft Academic Search

L'Europe du Sud-est est un lieu particulier, carrefour de civilisations différentes et mosaïque de cultures et de populations. Les caractéristiques physicogéographiques et les conjonctures historiques en Europe du Sud-est ont formé un milieu de discontinuités et de diversités importantes. Ce fait constitue le fond pertinent sur lequel une opulence patrimoniale matérielle et immatérielle appréciable s'épanouit. La richesse au niveau ethnologique,

Tsilimigkas Giorgos

280

Benthic trophic network in the Bay of Banyuls-sur-Mer (northwest Mediterranean, France): An assessment based on stable carbon and nitrogen isotopes analysis  

Microsoft Academic Search

The benthic trophic network in the Bay of Banyuls-sur-Mer was studied through the carbon and nitrogen isotopic characterization of a large set of soft-bottom macrobenthic invertebrates, fishes and potential food sources. Continental inputs as well as seagrass meadows did not contribute significantly to this benthic trophic network as indicated by: (1) the difference between their ?13C signatures (respectively ?28.4‰ and

Antoine Carlier; Pascal Riera; Jean-Michel Amouroux; Jean-Yves Bodiou; Antoine Grémare

2007-01-01

281

Portée du système comptable OHADA1 sur la production et la diffusion de l'information financière des entreprises de petite dimension  

Microsoft Academic Search

Résumé: La présente étude s'est proposée de cerner les apports éventuels du système comptable OHADA dans la production et la diffusion de l'information financière des entreprises de petite dimension. Après avoir présenté le cadre comptable propre à cette catégorie d'entreprises, nous avons bien voulu nous pencher sur la portée de l'information comptable qui en découle, d'une part du côté du

NDJANYOU Laurent

282

[Updated acute community-acquired pneumonia in adults: Guidelines for initial antimicrobial therapy based on local evidence from the South American Working Group (ConsenSur II)].  

PubMed

Community-acquired pneumonia (CAP) in adults is probably one of the infections affecting ambulatory patients for which the highest diversity of guidelines has been written worldwide. Most of them agree in that antimicrobial therapy should be initially tailored according to either the severity of the infection or the presence of comorbidities and the etiologic pathogen. Nevertheless, a great variability may be noted among the different countries in the selection of the primary choice in the antimicrobial agents, even for the cases considered as at a low-risk class. This fact may be due to the many microbial causes of CAP and specialties involved, as well as the different health-care systems effecting on the availability or cost of antibiotics. However, many countries or regions adopt some of the guidelines or design their own recommendations regardless of the local data, probably because of the scarcity of such data. This is the reason why we have developed a guideline for the initial treatment of CAP by 2002 upon the basis of several local evidences in South América (ConsenSur I). However, several issues deserve to be currently rediscussed as follows: certain clinical scores other than the Physiological Severity índex (PSI) have become more popular in clinical practice (i.e. CURB-65, CRB-65); some pathogens have emerged in the región, such as community-acquired methicillin resistant Staphylococcus aureus (CA-MRSA) and Legionella spp; new evidences on the performance of the rapid test for the etiologic diagnosis in CAP have been reported (eg. urinary Legionella andpneumococcus antigens); new therapeutic considerations needs to be approached (i.e. dosage reformulation, duration of treatment, emergence of novel antibiotics and clinical impact of combined therapy). Like in the first versión of the ConsenSur (ConsenSur I), the various current guidelines have helped to organize and stratify the present proposal, ConsenSur II. PMID:20737129

Bantar, Carlos; Curcio, Daniel; Jasovich, Abel; Bagnulo, Homero; Arango, Alvaro; Bavestrello, Luis; Famiglietti, Angela; García, Patricia; Lopardo, Gustavo; Losanovscky, Miriam; Martínez, Ernesto; Pedreira, Walter; Piñeyro, Luis; Remolif, Christian; Rossi, Flavia; Varón, Fabio

2010-07-26

283

Two Neonatal Diabetes Mutations on Transmembrane Helix 15 of SUR1 Increase Affinity for ATP and ADP at Nucleotide Binding Domain 2*  

PubMed Central

KATP channels, (SUR1/Kir6.2)4 (sulfonylurea receptor type 1/potassium inward rectifier type 6.2) respond to the metabolic state of pancreatic ?-cells, modulating membrane potential and insulin exocytosis. Mutations in both subunits cause neonatal diabetes by overactivating the pore. Hyperactive channels fail to close appropriately with increased glucose metabolism; thus, ?-cell hyperpolarization limits insulin release. KATP channels are inhibited by ATP binding to the Kir6.2 pore and stimulated, via an uncertain mechanism, by magnesium nucleotides at SUR1. Glibenclamide (GBC), a sulfonylurea, was used as a conformational probe to compare nucleotide action on wild type versus Q1178R and R1182Q SUR1 mutants. GBC binds with high affinity to aporeceptors, presumably in the inward facing ATP-binding cassette configuration; MgATP reduces binding affinity via a shift to the outward facing conformation. To determine nucleotide affinities under equilibrium, non-hydrolytic conditions, Mg2+ was eliminated. A four-state equilibrium model describes the allosteric linkage. The KD for ATP4? is ?1 versus 12 mm, Q1178R versus wild type, respectively. The linkage constant is ?10, implying that outward facing conformations bind GBC with a lower affinity, 9–10 nm for Q1178R. Thus, nucleotides cannot completely inhibit GBC binding. Binding of channel openers is reported to require ATP hydrolysis, but diazoxide, a SUR1-selective agonist, concentration-dependently augments ATP4? action. An eight-state model describes linkage between diazoxide and ATP4? binding; diazoxide markedly increases the affinity of Q1178R for ATP4? and ATP4? augments diazoxide binding. NBD2, but not NBD1, has a higher affinity for ATP (and ADP) in mutant versus wild type (with or without Mg2+). Thus, the mutants spend more time in nucleotide-bound conformations, with reduced affinity for GBC, that activate the pore.

Ortiz, David; Voyvodic, Peter; Gossack, Lindsay; Quast, Ulrich; Bryan, Joseph

2012-01-01

284

Acclimatation sur la côte d'azur et en corse de Serangium parcesetosum [Col.: Coccinellidae] prédateur de l'aleurode des citrus, Dialeurodes citri [Hom.: Aleyrodidae  

Microsoft Academic Search

Résumé  La CoccinelleSerangium parcesetosum Sicard originaire de l'Inde a été importée en France en 1985 de Géorgie soviétique où elle avait été introduite pour lutter\\u000a contre l'Aleurode des CitrusDialeurodes citri Ashmead. Les premiers lâchers ont été effectués sur la Côte d'Azur et en Corse où elle semble désormais bien acclimatée.

J. C. Malausa; E. Franco; P. Brun

1988-01-01

285

Spawning of Small Pelagic Fishes in Bah??a Magdalena, Baja California Sur, México, at the Beginning of the 1997–1998 El Niño Event  

Microsoft Academic Search

A study of the seasonal abundance of planktonic eggs and larvae of small pelagic fishes, and relationships of egg and larval abundances with sea surface temperature and zooplankton biomass in Bah??a Magdalena, Baja California Sur, México, a subtropical lagoon, was done during the first year of the 1997–1998 El Niño event.Sardinops caeruleus and Scomber japonicus spawned primarily in winter, when

R Funes-Rodr??guez; A Hinojosa-Medina; R Avendaño-Ibarra; M Hernández-Rivas; R Saldierna-Mart??nez; W Watson

2001-01-01

286

The Common C49620T Polymorphism in the Sulfonylurea Receptor Gene SUR1 (ABCC8) in Patients with Gestational Diabetes and Subsequent Glucose Metabolism Abnormalities  

PubMed Central

Aim. The aim of this study is to investigate the relationship between the common C49620T polymorphism in the sulfonylurea receptor (SUR1) gene and glucose metabolism, ?-cell secretory function and insulin resistance in women with a history of gestational diabetes (GDM). Material and Methods. Study group included 199 women, diagnosed GDM within the last 5–12 years and control group of comparable 50 women in whom GDM was excluded during pregnancy. Blood glucose and insulin levels were measured during oral glucose tolerance test. Indices of insulin resistance (HOMA-IR) and ?-cell function (HOMA %B) were calculated. In all patients, the C49620T polymorphism in intron 15 of the SUR1 gene was determined. Results. The distribution of the studied polymorphism in the two groups did not differ from each other (?2 = 0.34, P = 0.8425). No association between the distribution of polymorphisms and coexisting glucose metabolism disorders (?2 = 7,13, P = 0, 3043) was found. No association was also observed between the polymorphism and HOMA %B or HOMA-IR. Conclusions. The polymorphism C49620T in the SUR1 gene is not associated with insulin resistance and/or insulin secretion in women with a history of GDM and does not affect the development of GDM, or the development of glucose intolerance in the studied population.

Moleda, Piotr; Binczak-Kuleta, Agnieszka; Homa, Katarzyna; Safranow, Krzysztof; Celewicz, Zbigniew; Syrenicz, Anhelli; Stefanski, Adam; Fronczyk, Aneta; Majkowska, Lilianna

2012-01-01

287

Protein Phosphatase 2A-SUR-6/B55 Regulates Centriole Duplication in C. elegans by Controlling the Levels of Centriole Assembly Factors  

PubMed Central

Summary Centrioles play a crucial role in mitotic spindle assembly and duplicate precisely once per cell cycle. In worms, flies, and humans, centriole assembly is dependent upon a key regulatory kinase (ZYG-1/Sak/Plk4) and its downstream effectors SAS-5 and SAS-6. Here we report a role for protein phosphatase 2A (PP2A) in centriole duplication. We find that the PP2A catalytic subunit LET-92, the scaffolding subunit PAA-1, and the B55 regulatory subunit SUR-6, function together to positively regulate centriole assembly. In PP2A-SUR-6-depleted embryos, the levels of ZYG-1 and SAS-5 are reduced and the ZYG-1- and SAS-5-dependent recruitment of SAS-6 to the nascent centriole fails. We show that PP2A physically associates with SAS-5 in vivo, and that inhibiting proteolysis can rescue SAS-5 levels and the centriole duplication defect of PP2A-depleted embryos. Together our findings indicate that PP2A-SUR-6 promotes centriole assembly by protecting ZYG-1 and SAS-5 from degradation.

Song, Mi Hye; Liu, Yan; Anderson, D. Eric; Jahng, Wan Jin; O'Connell, Kevin F.

2011-01-01

288

Protein phosphatase 2A-SUR-6/B55 regulates centriole duplication in C. elegans by controlling the levels of centriole assembly factors.  

PubMed

Centrioles play a crucial role in mitotic spindle assembly and duplicate precisely once per cell cycle. In worms, flies, and humans, centriole assembly is dependent upon a key regulatory kinase (ZYG-1/Sak/Plk4) and its downstream effectors SAS-5 and SAS-6. Here we report a role for protein phosphatase 2A (PP2A) in centriole duplication. We find that the PP2A catalytic subunit LET-92, the scaffolding subunit PAA-1, and the B55 regulatory subunit SUR-6 function together to positively regulate centriole assembly. In PP2A-SUR-6-depleted embryos, the levels of ZYG-1 and SAS-5 are reduced and the ZYG-1- and SAS-5-dependent recruitment of SAS-6 to the nascent centriole fails. We show that PP2A physically associates with SAS-5 in vivo and that inhibiting proteolysis can rescue SAS-5 levels and the centriole duplication defect of PP2A-depleted embryos. Together, our findings indicate that PP2A-SUR-6 promotes centriole assembly by protecting ZYG-1 and SAS-5 from degradation. PMID:21497766

Song, Mi Hye; Liu, Yan; Anderson, D Eric; Jahng, Wan Jin; O'Connell, Kevin F

2011-04-19

289

Everyone's an influencer: quantifying influence on twitter  

Microsoft Academic Search

In this paper we investigate the attributes and relative influence of 1.6M Twitter users by tracking 74 million diffusion events that took place on the Twitter follower graph over a two month interval in 2009. Unsurprisingly, we find that the largest cascades tend to be generated by users who have been influential in the past and who have a large

Eytan Bakshy; Jake M. Hofman; Winter A. Mason; Duncan J. Watts

2011-01-01

290

Protein kinase C modulation of recombinant ATP-sensitive K+ channels composed of Kir6.1 and/or Kir6.2 expressed with SUR2B  

PubMed Central

The molecular identity of smooth muscle ATP-sensitive K+ channels (KATP) is not established with certainty. Patch clamp methods were employed to determine if recombinant KATP channels composed of Kir6.1 and SUR2B subunits expressed by human embryonic kidney (HEK293) cells share an identical modulation by protein kinase C (PKC) with the vascular KNDP subtype of KATP channel. The open probability of Kir6.1/SUR2B channels was determined before and after sequential exposure to pinacidil (50 ?M) and the combination of pinacidil and phorbol 12,13-dibutyrate (PdBu; 50 nm). Treatment with PdBu caused a decline in channel activity, but this was not seen with an inactive phorbol ester, 4?-phorbol 12,13-didecanoate (PdDe; 50 nm). Angiotensin II (0.1 ?M) induced a similar inhibition of Kir6.1/SUR2B channels in cells expressing angiotensin AT1 receptors. The effects of PdBu and angiotensin II were blocked by the PKC inhibitor, chelerythrine (3 ?M). Purified PKC inhibited Kir6.1/SUR2B activity (in 0.5 mm ATP/ 0.5 mm ADP), and the inhibition was blocked by a specific peptide inhibitor of PKC, PKC(19-31). In contrast, PdBu increased the activity of recombinant KATP channels composed of Kir6.2 and SUR2B, or the combination of Kir6.1, Kir6.2 and SUR2B subunits. The results indicate that the modulation by PKC of Kir6.1/SUR2B, but not Kir6.2/SUR2B or Kir6.1-Kir6.2/SUR2B channel gating mimics that of native vascular KNDP channels. Physiological inhibition of vascular KATP current by vasoconstrictors which utilize intracellular signalling cascades involving PKC is concluded to involve the modulation of KNDP channel complexes composed of four Kir6.1 and their associated SUR2B subunits.

Thorneloe, Kevin S; Maruyama, Yoshiaki; Malcolm, A Todd; Light, Peter E; Walsh, Michael P; Cole, William C

2002-01-01

291

Transmission System Radio Influence  

Microsoft Academic Search

An economic overhead electric power transmission system which produces no radio influence is beyond the present state of the art. However, sound engineering and attention to relevant aspects of design can produce a system having an acceptable (or tolerable) influence level. Such criteria as have been proved by research or experience together with accepted practices in instrumentation and measurement of

1965-01-01

292

Motivational Influences on Transfer  

ERIC Educational Resources Information Center

|Both transfer and motivation are important constructs accompanied by extensive bodies of literature. However, there is a lack of integration of the 2 constructs. This article analyzes the potential indirect influence of motivational factors on transfer by reviewing studies that examine the influence of motivation on cognitive processes related to…

Pugh, Kevin J.; Bergin, David A.

2006-01-01

293

Mixed Model Influence Diagnostics  

Microsoft Academic Search

Linear models for uncorrelated data have well established measures to gauge the influence of one or more observations on the analysis. For such models, closed-form update expressions allow efficient computa- tions without refitting the model. When similar notions of statistical influence are applied to mixed models, things are more complicated. Removing data points affects fixed effects and covariance parameter esti-

Oliver Schabenberger

294

Can Television Influence People?  

ERIC Educational Resources Information Center

|Discusses simultaneous airing by three commercial networks and influence on viewers' attitudes of The Great American Values Test, a 30-minute informational program designed to affect viewers' values about environmental issues, racial equality, and sexual equality. The program's effectiveness at influencing behavior was proven by a field…

Comstock, George

1985-01-01

295

Les effets du travail en equipe dans l'apprentissage par projets sur la motivation des etudiantes et des etudiants en formation des ingenieurs  

NASA Astrophysics Data System (ADS)

Les representants des secteurs industriels et les, milieux professionnels en Amerique du Nord reprochaient aux universites de former des ingenieurs avec peu d'experience pratique en resolution de problemes et en conception. Quelques programmes de genie ont alors mis en place le travail en equipe dans l'apprentissage par projets. Beaucoup d'ecrits font valoir les benefices de l'apprentissage par projets sur la motivation des etudiants. Or, ces benefices commencent a peine a faire l'objet de recherches visant a produire des donnees probantes a ce sujet. Les travaux sur la motivation en contexte d'apprentissage et les modeles theoriques developpes sont issus d'environnements d'apprentissage marques par l'enseignement magistral. Le modele de la valeur attendue de la tache (Eccles et Wigfield, 1995; Neuville, 2004) et le modele du systeme-groupe (St-Arnaud, 2008) ont ete retenus pour mesurer les effets du travail en equipe dans l'apprentissage par projets sur la motivation. La recherche visait aussi a approfondir et a nuancer la comprehension de la motivation des etudiants universitaires apprenant en contexte innovant. Les sujets constituent des etudiants (n=100) travaillant sur des projets d'integration au cours des trois sessions initiales du programme de genie mecanique d'une universite canadienne. L'analyse de regression multiple revele que les construits de la motivation expliquent un tiers de la variance de l'engagement academique dans la realisation du projet d'integration. Les perceptions de l' "expectancy", de la valeur intrinseque et utilitaire sont les determinants principaux de l'engagement des etudiants. L'analyse de variance multivariee a mesures repetees indique que la motivation des etudiants pour le travail sur les projets d'integration a augmente au cours des trois sessions initiales du parcours de formation. Finalement, malgre l'absence d'interaction significative entre les variables de motivation et de l'equipe, les reponses des sujets indiquent une amelioration du travail en equipe au terme des trois sessions. Mots cle: 1. apprentissage par projet; 2. projets d'integration; 3. travail en equipe; 4. motivation; 5. valeur attendue de la tache; 6. expectancy; 7. valeur intrinseque; 8. valeur utilitaire; 9. formation d'ingenieurs; 10. analyse quantitative.

Fernandez, Nicolas

296

Housing and Living Arrangements of South Asian Immigrant Seniors in Edmonton, Alberta  

Microsoft Academic Search

RESUME ´ La population canadienne vieillit et se diversifie sur le plan ethnique. La presente communication porte sur les aõ ˆnes immigrants de l'Asie du Sud et examine les differences en matiere de conditions de logement et de vie des aõ ˆnes qui ont immigreadiverses epoques de leur vie. Nous avons intervieweun echantillon de commoditede 161 immigrants aõ ˆnes de

Cheuk Fan Ng; Herbert C. Northcott; Sharon McIrvin Abu-Laban

2007-01-01

297

Baseline heavy metals and metalloid values in blood of loggerhead turtles (Caretta caretta) from Baja California Sur, Mexico.  

PubMed

Environmental pollution due to heavy metals is having an increased impact on marine wildlife accentuated by anthropogenic changes in the planet including overfishing, agricultural runoff and marine emerging infectious diseases. Sea turtles are considered sentinels of ecological health in marine ecosystems. The objective of this study was to determine baseline concentrations of zinc, cadmium, copper, nickel, selenium, manganese, mercury and lead in blood of 22 clinically healthy, loggerhead turtles (Caretta caretta), captured for several reasons in Puerto López Mateos, Baja California Sur, Mexico. Zinc was the most prevalent metal in blood (41.89 ?g g?¹), followed by Selenium (10.92 ?g g?¹). The mean concentration of toxic metal Cadmium was 6.12 ?g g?¹ and 1.01?g g?¹ respectively. Mean concentrations of metals followed this pattern: Zn>Se>Ni>Cu>Mn>Cd>Pb and Hg. We can conclude that blood is an excellent tissue to measure in relatively non-invasive way baseline values of heavy metals in Caretta caretta. PMID:21788056

Ley-Quiñónez, C; Zavala-Norzagaray, A A; Espinosa-Carreón, T L; Peckham, H; Marquez-Herrera, C; Campos-Villegas, L; Aguirre, A A

2011-07-23

298

Electrical Resistivity Tomographies on the detection of adobe buried archaeological structures in Piramide Sur in Cahuachi (Peru)  

NASA Astrophysics Data System (ADS)

During the last two decades of excavations, adobe pyramids dating back from the 6th century B.C. to the 4th century A.D have been unearthed in the ancient Ceremonial Centre of Cahuachi near Nasca (Peru) by an Italian-Peruvian mission directed by Giuseppe Orefici. One of the archaeological sectors, called sector A, has been almost excavated and restored. To complete sector A only a terraced mound named "Piramide Sur" needs to be excavated. In order to provide useful information on the presence of buried structures and platforms as well on the geological stratigraphy a multi-scale approach based on the integration of satellite remote sensing with geophysical techniques was employed. Such investigations were carried out by the Italian mission ITACA, funded by the Italian Ministry Affairs and composed of researchers of two institutes of CNR (IMAA and IBAM), which provides a scientific support for archaeological research, since 2007. In particular, the subsurface features were investigated by Geoelectrical prospecting, performed by using a georesistivimeter for tomography which observe the resistivity value along sections. Several tomographies were carried out to investigate the shallow and deep structure of the pyramid both along the main flank at Nord and on the top. Finally, the integration of all data acquired by the different remote sensing techniques allowed for spatially characterizing the archaeological features, thus providing important information for the planning of the next archaeological campaign.

Capozzoli, L.; Masini, N.; Rizzo, E.; Lasaponara, R.; Orefici, G.

2012-04-01

299

Principes et réalisation d'une chaîne laser femtoseconde haute intensité basée sur le saphir dopé au titane  

NASA Astrophysics Data System (ADS)

We present the initial study, the realisation and the characterisation of a high intensity femtosecond laser chain. This chain is able to produce intensities higher than 10^18 W/cm2 on target, at a 10 Hertz repetition rate. We present first fondamentals principles of chirped pulse propagation mechanisms: group velocity dispersion, self-phase modulation, self-focusing, and gain saturation. Then after describing the spectroscopic properties of titanium doped sapphire (Ti:S), we discuss near infrared femtosecond oscillators able to be amplified in Ti:S medium, and describe our home made Kerr Lens mode locked femtosecond Ti:S oscillator. The high intensity laser chain is based on the Chirped Pulse Amplification concept, which consists in stretching the pulse before its amplification in order to avoid non-linear effects such self-focusing or breakdown, and then recompressing it to its initial pulse duration. We have developed two compact and efficient multipass amplifiers for femtosecond chirped pulse amplification. With only two of these devices, we obtain an amplification factor of 10^8, which corresponds to a peak power of ˜ 0.5 terawatt after compression. We analyse in details the performances of this system and its advantages in terms of its high quantum yield (0.3), flexibility, and optical quality. Some observed spectral distortion on chirped pulses is simply explained by a gain saturation model. High dynamic pulse temporal control is crucial for interaction experiments. For this reason, we have developed a third order sampling autocorrelator. This device is able to measure 100 fs pulses with more than 8 orders of magnitude. I compare our obtained performances to other femtosecond systems and I analyse the best way to increase the energy, reduce the pulse duration and optimise focusing in order to reach the 10^19 W/cm2 regime. Ce mémoire présente les études préliminaires, la réalisation et la caractérisation d'une chaîne dite "de haute intensité" en régime femtosecondes. Cette installation est capable de produire sur cible des intensités supérieures à 10^18 W/cm2 à une récurrence de 10 tirs par seconde. Nous présentons tout d'abord les principes fondamentaux de la propagation d'impulsions étirées dans un milieu amplificateur en mettant en évidence les principaux mécanismes mis en jeu dans ce processus : la dispersion de vitesse de groupe, l'automodulation de phase, l'autofocalisation et la saturation du gain. Une analyse des différentes possibilités quant au choix de la source initiale capable d'émettre des impulsions de durée femtoseconde dans le domaine du proche infrarouge est réalisée après la présentation des caractéristiques spectroscopiques du saphir dopé au titane. Sont en particulier décrits en détail le principe et le fonctionnement de l'oscillateur au saphir dopé au titane à autoblocage de modes que nous avons construit à cet effet. L'amplification jusqu'aux puissances de l'ordre du terawatt repose sur le concept "CPA" d'amplification d'impulsions à dérive de fréquence. Nous explorons ici la voie des amplificateurs à multipassages suivant des configurations déjà développées pour les amplificateurs à colorants. Une attention particulière a été portée sur les méthodes de réglage, la fiabilité, la stabilité et la qualité du profil spatial du faisceau. D'autre part, une modélisation rend parfaitement compte des effets de saturation dans les amplificateurs. Les impulsions obtenues après compression ont une énergie de l'ordre de 60 mJ et une durée de l'ordre de 130 fs. La partie suivante est consacrée à une étude des problèmes d'étirement et de recompression pour tenter d'expliquer les raisons de cette recompression imparfaite. Finalement, un paramètre encore plus crucial pour la physique de l'interaction sur cible solide sans création d'un préplasma est le contraste des impulsions. Nous décrivons donc l'appareil de mesure capable d'effectuer des autocorrélations avec une dynamique dépassant 10^8 permettant d'observer un évent

Le Blanc, Catherine

300

Infection rates in Dipetalogaster maximus (Reduviidae: Triatominae) by Trypanosoma cruzi in the Cape Region, Baja California Sur, México.  

PubMed

Infection rates of Trypanosoma cruzi Chagas (in the blood-sucking bug Dipetalogaster maximus [Uhler]) were determined from specimens collected at 12 localities in the Cape Region of Baja California Sur, Mexico. Eight collection sites were located in the tropical dry forest, two in desert shrub, and two in the ecotone between these two communities. Of the 245 D. maximus collected, 65% were first and second instar nymphs; 32.6% were third, fourth, and fifth instar nymphs; and 2.4% were adults. The highest proportion of specimens came from El Fandango (30%) and San Bartolo (23%) canyons and La Cruz hill (12%) in the mountain slopes facing the Gulf of California. In feces from individual bugs analyzed for T. cruzi, we found an overall infection rate of 7.0%. Infection rates increased from 4.1% in second instars to 42.% in fifth instars. High infection rates were found in bugs collected from La Poza (38.4%), El Gato (27.2%), and El Pedregoso (25%) hills; low infection rates were found in specimens from La Cruz hill and San Bartolo canyon. Specimens from some collection sites were not infected with T. cruzi. PMID:12597648

Jiménez, María-Luisa; Llinas, Jorge; Palacios, Carlos

2003-01-01

301

Late quaternary uplift rates of marine terraces on the Pacific coast of North America, southern Oregon to Baja California sur  

USGS Publications Warehouse

Marine terraces are common landforms along the Pacific coast of North America from southern Oregon to southern Baja California. We report 60 new uranium-series ages of marine terrace corals, hydrocorals, and other fossils. Terraces representing the ca. 80 ka and ca. 125 ka high stands of sea are the most common along the Pacific coast and we have used these ages, along with terrace shoreline angle elevations and paleo-sea-level estimates, to calculate Late Quaternary uplift rates. Uplift rates in the forearc region of the Cascadia subduction zone range from 0.45-1.08 m/kyr. Farther south, along most of the coast west of the San Andreas fault zone, uplift rates range from 0.15-0.35 m/kyr, but some areas have significantly higher rates of uplift and others have apparently experienced little or no uplift in the last 125 ka. In Baja California Sur, west of the East Pacific Rise, little or no uplift has occurred during the Late Quaternary. On average, the magnitude of rates of uplift for the tectonic regimes is as follows: Cascadia subduction zone > San Andreas fault zone region > East Pacific Rise region. ?? 1992.

Muhs, D. R.; Rockwell, T. K.; Kennedy, G. L.

1992-01-01

302

Influence of Purity Level on the Structural Evolution and the Mechanical Properties of the Ti-48Al Alloys  

NASA Astrophysics Data System (ADS)

The influence of the alloy purity level on the properties of Ti-48Al was studied using two sets of samples. The main difference in composition between them was the oxygen concentration, 15 and 980 wt ppm, respectively. The characteristic mechanical values at room temperature, Vickers microhardness, proofstress in compression and creep behaviour at 1073 K were studied for the two sets and for two different microstructures, lamellar microstructure (fully transformed) and duplex microstructure. For the purity levels under study, the oxygen concentration did not influence the microstructure or the room temperature mechanical properties. The creep tests at 1073 K showed that the steady-state strain rate of the pure lamellar alloy was an order of magnitude larger than that of the impure lamellar alloy. In the case of the duplex microstructure, the impurity effect was much less important. The creep strength of the impure lamellar alloy was greater than that of the duplex alloy. L'influence de la pureté sur les propriétés de l'alliage Ti-48Al a été étudiée en utilisant deux types d'échantillons. La principale différence de composition entre les deux lots d'échantillons résidait dans la concentration en oxygène, 15 ppm-poids and 980 ppm-poids respectivement. Les caractéristiques mécaniques à la température ambiante, microdureté Vickers, limite élastique en compression, et le comportement en fluage à 1073 K, ont été étudiés pour les deux lots d'échantillons et pour deux microstructures différentes, la microstructure lamellaire (complètement transformée) et la microstructure mixte. Aux niveaux de pureté considérés, la concentration en oxygène n'avait pas d'influence sur la microstructure et sur les propriétés mécaniques à la température ambiante. Les essais de fluage à 1073 K ont montré que la vitesse de fluage en régime stationnaire, dans le cas de la structure lamellaire, était dix fois plus grande pour l'alliage pur que pour l'alliage impur. Dans le cas de la microstructure mixte, l'effet de la pureté était beaucoup moins important. La résistance au fluage de l'alliage impur était plus grande dans la structure lamellaire que dans la structure mixte.

Hitier, P.; Bonnentien, J. L.; Bertrand, C.; Cornet, M.; Bigot, J.

1997-04-01

303

Prediction de la transition sur des configurations tridimensionnelles en regime transsonique  

NASA Astrophysics Data System (ADS)

The first objective of this thesis is to propose a tool for the prediction of the laminar-turbulent that will be reliable, efficient and easy to use in aerospace industry applications. Together with this objective, a study will also be conducted of how the stability of transonic flows is affected by the following physical aspects: full account of the three-dimensional nature of the mean flow, curvature of the surface along which the flow develops and non-parallel effects. The proposed transition prediction method relies on the use of a database of stability characteristics of a model three-dimensional compressible boundary layer. A coupling method based on the physical parameters of the mean flow, such as local Mach number, Reynolds number and boundary layer shape factor, allows the extraction from the database of quantities such as the amplification rate for a given frequency or the maximum amplification frequency of the boundary layer studied. The stability characteristics of the model boundary are precomputed, using the compressible linear stability equations with the classical parallel flow assumption and without curvature effects. Comparing the stability characteristics and n factors obtained from a mean flow calculated by a fully-three-dimensional approach with those that result from the use of a quasi-three-dimensional mean flow (conical flow assumption) shows the significative influence of transverse (or spanwise) pressure gradients on the stability of a three-dimensional flow. In the same way, the potentially strong influence of curvature and non-parallel effects (the latter calculated using the PSE approach), respectively stabilising and destabilising, on the amplification rate of streamwise instabilities was demonstrated. However, the inclusion of these effects does not lead to a more consistent value of the n factor at transition than is obtained by the classical theory, as demonstrated by correlating the calculated values of n with the location of transition determined in windtunnel tests on infinite swept wings with ONERA D and AFVD 82 profiles and Bombardier business aircraft wings. The results obtained with the proposed automated stability analysis method have shown that it provides a qualitatively adequate representation of a transonic three-dimensional flow stability characteristics: dominant instability type, frequency of maximum amplification, amplification rate. Computation of the n factor was performed for the AS409 conical wing and two Bombardier business aircraft wings. For these cases, the automated method n factors are higher than those obtained by a complete eigenvalue calculation. This difference is probably largely due to the fact the model boundary layer used does not provide a completely appropriate representation of the crossflow velocity profiles. It is however within the range of variation of the n factor from one case to the other, when the full eigenvalue solution is used. Comparison of the calculated n factors and the experimentally observed location of transition on the Bombardier wings has revealed a spanwise variation of the critical n factor, with both the complete and automated calculation methods. To improve the prediction of transition, a relation between the n factor at transition and a local Reynolds number (varying along the span) is proposed.

Langlois, Marc

304

[Temporal and spatial distribution of shorebirds (Charadriiformes) at San Ignacio Lagoon, Baja California Sur, Mexico].  

PubMed

Baja California Peninsula has several wetlands that represent important ecosystems for shorebirds. San Ignacio Lagoon is one of these sites, and supports 10% of the total abundance of shorebirds reported in this Peninsula. Since there is few information about this group in this area, we studied spatial and temporal changes in abundance and distribution of shorebirds in San Ignacio Lagoon. For this, we conducted twelve monthly censuses (October 2007-September 2008) on the entire internal perimeter of the lagoon, which we divided into four areas: two at the North and two at the South. We observed a seasonal pattern, with the lowest abundance in May (1 585 birds) and the highest in October (47 410). The most abundant species were Marbled Godwits (Limosa fedoa; 55% of the total records), Western Sandpipers (Calidris mauri; 23%), and Willet (Tringa semipalmata; 10%). All three species were more abundant in autumn; for both, the Marbled Godwit and Willet, we observed their highest numbers in winter and spring, while the Western Sandpiper showed noticeable oscillations, reaching a maximum in early winter (December). In summer, Marbled Godwit and Willet were the only birds present but in lower numbers. Here present the first records of the Pacific Red Knot (Calidris canutus roselaari) in the area. Bird abundance and species richness were influenced seasonally by migration and spatially by sites in the lagoon. The greatest shorebird abundance was in the South area of the lagoon, probably because of better accessibility to food. Our results allowed the inclusion of San Ignacio Lagoon in the Western Hemisphere Shorebirds Reserve Network (WHSRN) as a site of international importance. PMID:23894976

Mendoza, Luis Francisco; Carmona, Roberto

2013-03-01

305

Une recension des ?crits concernant la r?alit? psychoaffective des femmes ayant une vulvodynie : Difficult?s rencontr?es et strat?gies d?velopp?es  

PubMed Central

HISTORIQUE : Au cours des trois dernières décennies, une attention grandissante a été portée à l’étude du syndrome de vulvodynie, soit un inconfort vulvaire chronique inexpliqué, éprouvé en l’absence de pathologie précisée. En plus d’avoir des répercussions physiques, l’expérience de la vulvodynie comporte une dimension psychosociale. OBJECTIF : Cet article vise à faire une recension des écrits sur la réalité psychoaffective des femmes qui éprouvent une vulvodynie. MÉTHODE : Une recherche documentaire basée sur une exploration systématique de textes présentant des résultats de recherche et recensés dans les principales banques de données en sciences sociales, dont Dissertation Abstracts, Current Contents et PsycINFO, a été réalisée. RÉSULTATS : Cette recension des écrits révèle, malgré la présence de certains résultats divergents, que les femmes ayant une vulvodynie affrontent souvent des difficultés identitaires et psychologiques, qui sont influencées notamment par les normes sociales de sexualité et de féminité. Pour composer avec ces difficultés, les femmes développent différentes stratégies visant à diminuer le stress occasionné par la douleur et à améliorer leur bien-être psychologique. CONCLUSION : Les difficultés relationnelles et psychologiques vécues par les femmes ayant une vulvodynie ne découlent pas seulement de la douleur physique, mais aussi du sens qu’elles lui accordent, souvent influencé par les discours sociaux sur l’hétérosexualité et la féminité. Il importe donc d’intervenir auprès des femmes en tenant compte de l’influence du contexte social tout en poursuivant le développement des connaissances sur les aspects psychosociaux de cette expérience.

Cantin-Drouin, Maude; Damant, Dominique; Turcotte, Daniel

2008-01-01

306

Factors Influencing Army Accessions.  

National Technical Information Service (NTIS)

The subject of this thesis is accessions and the factors influencing a potential recruit's decision to join the Army. Six types of analysis were performed: regression analysis, data base profile analysis through SPSS Frequencies and Crosstabs, factor anal...

K. M. Kalinich D. C. Wenzel

1982-01-01

307

Organisational change through influence  

Microsoft Academic Search

Influence is a phenomenon underpinning many types of interactions in both human and artificial organisations, and has a significant\\u000a impact on the operation of the organisation. If influence can be examined at the organisational level, instead of at the level\\u000a of the agents involved, engineers can better understand an organisation’s robustness to structural, behavioural and population\\u000a changes. In this paper

Mairi Mccallum; Wamberto Weber Vasconcelos; Timothy J. Norman

2008-01-01

308

Above the Influence: Activities Toolkit.  

National Technical Information Service (NTIS)

Contents: Introduction (what is above the influence, Bringing above the influence to your community); Above the Influence Activities (Tag it activity overview, step-by-step instructions, tag it examples, teen expressions art project activity overview, art...

2011-01-01

309

Evaluation of morphometry-based dating of monogenetic volcanoes—a case study from Bandas del Sur, Tenerife (Canary Islands)  

NASA Astrophysics Data System (ADS)

Morphometry-based dating provides a first-order estimate of the temporal evolution of monogenetic volcanic edifices located within an intraplate monogenetic volcanic field or on the flanks of a polygenetic volcano. Two widely used morphometric parameters, namely cone height/width ratio ( H max/ W co) and slope angle, were applied to extract chronological information and evaluate their accuracy for morphometry-based ordering. Based on these quantitative parameters extracted from contour-based Digital Elevation Models (DEMs), two event orders for the Bandas del Sur in Tenerife (Canary Islands) were constructed and compared with the existing K-Ar, paleomagnetic and stratigraphic data. The results obtained suggest that the commonly used H max/ W co ratio is not reliable, leading to inappropriate temporal order estimates, while the slope angle gives slightly better results. The overall performance of such descriptive parameters was, however, generally poor (i.e. there is no strong correlation between morphometry and age). The geomorphic/morphometric mismatches could be the result of (1) the diversity of syn-eruptive processes (i.e. diverse initial morphologies causing geomorphic/morphometric variability), (2) contrasting, edifice-specific degradation that depends partly upon the inner facies architecture of the volcanic edifices, (3) various external environmental controls (e.g. tephra mantling from pyroclastic density currents unrelated to the edifice evaluated) and (4) differences in the scale/resolution of input data. The observed degradation trend and changes in morphometric parameters over time do not support a simple degradation model for monogenetic scoria cones volcanoes.

Kereszturi, Gábor; Geyer, Adelina; Martí, Joan; Németh, Károly; Dóniz-Páez, F. Javier

2013-07-01

310

Intraspecific crossings of Undaria pinnatifida (Harv.) Sur.—A possible time-saving way of strain selection  

NASA Astrophysics Data System (ADS)

Unicellular gametophytes of Undaria pinnatifida (Harv.) Sur. were isolated in Qingdao, P. R. China in April 1993 and in Tokushima, southern Japan in March 1995. Different intraspecific crossings by using unicellular male and female gametophytes were successfully undertaken in Sept. of 1995 in Qingdao. Sporophytes were transplanted to two different locations for open sea cultivation. One was at Zhanqiao (ZQ) Bay where the water current was slower than that of another location—Taipingjiao(TPJ). A total of 218 adult sporophytes were harvested on January 12 and 18 from TPJ and ZQ respectively. For eacn combination, 10 sporophytes were cultivated. Analysis of the morphological characteristics of adult sporophytes indicated that the longest length between two bases of the serration of pinnate blades (W2) is a morphological characteristic that can be transferred from the parent plant to the next generations regardless of environmental variations. There was evidence that W2 was apparently determined by sex-linked factors, i.e., by male parental gametophyte. Sporophytes from certain crossing combinations showed more vigorous growth than those from other crossing combinations. It is therefore possible to select gametophyte strains which can be used as parental gametophytes for the seedling production of sporophytes with more vigorous growth within shorter cultivation period. The morphology of hybrids from a Qingdao strain and a Tokushima cultivated strain resembled that of both parental plants in frond features (wrinkled or smooth) and W2. Sporophyll formation also varied with strains. The fact that adult sporophytes resulting from the same crossing combinations have identical morphological characteristics under the same environmental conditions indicates the possibility of a new way to select strains which are expected to be ideal for commerical production by purposely selecting, propagating, and seeding unicellular gametophytes for sporeling production through freeliving techniques of gametophytes.

Pang, Shao-Jun; Hu, Xiao-Yan; Wu, Chao-Yuan; Hirosawa, A.; Ohno, M.

1997-09-01

311

Mesures experimentales de l'impact des revetements hydrophobeset superhydrophobes sur la trainee et la portance d'un profil aerodynamique propre et glace  

NASA Astrophysics Data System (ADS)

Ce projet, realise a la demande du Laboratoire International des Materiaux Antigivre, a pour but de mesurer et definir experimentalement l'impact de revetements hydrophobes sur les coefficients de trainee et de portance d'un profil NACA 0012. Pour ce faire, la balance aerodynamique du LIMA devait tout d'abord etre amelioree afin d'offrir une sensibilite suffisante pour realiser le projet. Plusieurs ameliorations ont ete faites, comme le changement des cellules de charge, la diminution du nombre de cellules de charge, le changement du cadre de la balance, etc. Une fois ces ameliorations terminees, la reproductibilite, l'exactitude et la sensibilite ont ete valides afin de s'assurer de la fiabilite des resultats offerts par la balance. Pour les angles d'attaque etudies avec les revetements, soient -6° et 0°, la balance a une reproductibilite de +/-2,06% a 360 000 de nombre de Reynolds. Pour valider la sensibilite, des essais a -6° et 0° d'angle d'attaque et des nombres de Reynolds de 360 000 et 500 000 ont ete faits avec des papiers sables. Les resultats de ces essais ont permis de, tracer des courbes de tendances du coefficient de trainee du NACA 0012 en fonction de la rugosite de surface et d'etablir la valeur de la sensibilite de la balance a +/-8 mu m. Cinq revetements populaires ont ete choisis pour l'experimentation, soient le Wearlon, le Staclean, le Hirec, le Phasebreak ainsi que le Nusil. Les revetements sont soumis aux memes conditions experimentales que les papiers sables, et une rugosite equivalente est trouvee par extrapolation des resultats. Cependant, les rugosites equivalentes de surfaces different entre -6° et 0°. Les essais avec le Staclean et le Hirec donnent des coefficients de trainee equivalent a ceux avec l'aluminium, alors que le Wearlon, le Nusil et le Phasebreak donnent une augmentation du coefficient de trainee de 13%, 17% et 25% respectivement par rapport a l'aluminium. Pour les coefficients de portance, la balance ne detecte pas l'effet des revetements, ni des papiers sables, sur la force de portance ce qui signifie qu'il entre dans l'insensibilite de la balance. La derniere etape experimentale consistait a mesurer l'impact des revetements sur la formation de la glace ainsi que sur l'evolution des coefficients de trainee et de portance du NACA 0012 en fonction de l'accumulation de glace sur celui-ci. Le Wearlon a ete choisi comme revetement en raison de sa grande popularite. Des essais a -5°C et -20°C ont ete faits et les resultats ont montres que le Wearlon n'apporte pas d'effet benefique au NACA 0012 en conditions d'accumulations de glace. L'augmentation du coefficient de trainee du profil muni du Wearlon debutait plus rapidement que sur l'aluminium et de l'eau gelait legerement plus loin vers l'arriere du profil pendant les essais, ce qui n'est pas souhaitable. Le coefficient de trainee est superieur d'environ 13% pour le Wearlon par rapport a l'aluminium pendant toute l'accumulation de glace, ce qui correspond au meme ecart lorsque la glace n'est pas en cause. Pour le coefficient de portance, les resultats ne peuvent etre utilises pour une raison qui doit etre investiguee.

Villeneuve, Eric

312

Modèles cognitifs pour l'apprentissage en thermodynamique  

Microsoft Academic Search

Notre étude porte sur la collecte, la formalisation et la comparaison des modèles mentaux d'étudiants en thermodynamique. Elle s'appuie sur des résultats provenant de la psychologie cognitive et des outils développés en intelligence artificielle. Elle rapporte les observations sur des entretiens que nous avons menés auprès de Novices et d'Experts afin de saisir leurs modèles mentaux, et propose un formalisme

Jean-marc Charlot; Bernard Marcos; Jean Lapointe

1996-01-01

313

ATP-sensitive K+ channel-dependent regulation of glucagon release and electrical activity by glucose in wild-type and SUR1-/- mouse alpha-cells.  

PubMed

Patch-clamp recordings and glucagon release measurements were combined to determine the role of plasma membrane ATP-sensitive K+ channels (KATP channels) in the control of glucagon secretion from mouse pancreatic alpha-cells. In wild-type mouse islets, glucose produced a concentration-dependent (half-maximal inhibitory concentration [IC50]=2.5 mmol/l) reduction of glucagon release. Maximum inhibition (approximately 50%) was attained at glucose concentrations >5 mmol/l. The sulfonylureas tolbutamide (100 micromol/l) and glibenclamide (100 nmol/l) inhibited glucagon secretion to the same extent as a maximally inhibitory concentration of glucose. In mice lacking functional KATP channels (SUR1-/-), glucagon secretion in the absence of glucose was lower than that observed in wild-type islets and both glucose (0-20 mmol/l) and the sulfonylureas failed to inhibit glucagon secretion. Membrane potential recordings revealed that alpha-cells generate action potentials in the absence of glucose. Addition of glucose depolarized the alpha-cell by approximately 7 mV and reduced spike height by 30% Application of tolbutamide likewise depolarized the alpha-cell (approximately 17 mV) and reduced action potential amplitude (43%). Whereas insulin secretion increased monotonically with increasing external K+ concentrations (threshold 25 mmol/l), glucagon secretion was paradoxically suppressed at intermediate concentrations (5.6-15 mmol/l), and stimulation was first detectable at >25 mmol/l K+. In alpha-cells isolated from SUR1-/- mice, both tolbutamide and glucose failed to produce membrane depolarization. These effects correlated with the presence of a small (0.13 nS) sulfonylurea-sensitive conductance in wild-type but not in SUR1-/- alpha-cells. Recordings of the free cytoplasmic Ca2+ concentration ([Ca2+]i) revealed that, whereas glucose lowered [Ca2+]i to the same extent as application of tolbutamide, the Na+ channel blocker tetrodotoxin, or the Ca2+ channel blocker Co2+ in wild-type alpha-cells, the sugar was far less effective on [Ca2+]i in SUR1-/- alpha-cells. We conclude that the KATP channel is involved in the control of glucagon secretion by regulating the membrane potential in the alpha-cell in a way reminiscent of that previously documented in insulin-releasing beta-cells. However, because alpha-cells possess a different complement of voltage-gated ion channels involved in action potential generation than the beta-cell, moderate membrane depolarization in alpha-cells is associated with reduced rather than increased electrical activity and secretion. PMID:15561909

Gromada, Jesper; Ma, Xiaosong; Høy, Marianne; Bokvist, Krister; Salehi, Albert; Berggren, Per-Olof; Rorsman, Patrik

2004-12-01

314

Étude in situ de l'interface électrode/électrolyte par spectroscopie infrarouge de réflexion : électrooxydation du 1,3-propanediol sur des électrodes de platine et d'or  

NASA Astrophysics Data System (ADS)

The electrooxidation of 1,3-propanediol has been studied in acidic and alkaline medium on platinum and gold electrodes. Analysis of the reaction products was carried out using HPLC. Formaldehyde, malonic acid and CO2 were produced. An in situ infrared reflectance spectroscopic investigation confirms these results and gives new information about adsorbed species. L'oxydation électrocatalytique du 1,3-propanediol sur des électrodes de platine et d'or en milieu aqueux acide ou basique a été étudiée. L'analyse des produits d'une électrolyse prolongée du 1,3-propanediol sur une électrode de platine lisse en milieu acide indique la formation de formaldéhyde, d'acide malonique et de CO2. L'étude in situ par spectroscopie infrarouge de réflexion confirme les résultats d'électrolyse et donne des informations sur la nature des espèces adsorbées.

El M. Chbihi, M.; Cherqaoui, A.; Takky, D.; Hahn, F.; Huser, H.; Leger, J.-M.; Lamy, C.

1999-03-01

315

The sulphonylurea receptor SUR1 regulates ATP-sensitive mouse Kir6.2 K+ channels linked to the green fluorescent protein in human embryonic kidney cells (HEK 293).  

PubMed

1. Using a chimeric protein comprising the green fluorescent protein (GFP) linked to the C-terminus of the K+ channel protein mouse Kir6.2 (Kir6.2-C-GFP), the interactions between the sulphonylurea receptor SUR1 and Kir6.2 were investigated in transfected human embryonic kidney cells (HEK 293) by combined imaging and patch clamp techniques. 2. HEK 293 cells transfected with mouse Kir6.2-C-GFP and wild-type Kir6.2 exhibited functional K+ channels independently of SUR1. These channels were inhibited by ATP (IC50 = 150 microM), but were not responsive to stimulation by ADP or inhibition by sulphonylureas. Typically 15 +/- 7 active channels were found in an excised patch. 3. The distribution of Kir6.2-C-GFP protein was investigated by imaging of GFP fluorescence. There was a lamellar pattern of fluorescence labelling inside the cytoplasm (presumably associated with the endoplasmic reticulum and the Golgi apparatus) and intense punctate labelling near the cell membrane, but little fluorescence was associated with the plasma membrane. 4. In contrast, cells co-transfected with Kir6.2-C-GFP and SUR1 exhibited intense uniform plasma membrane labelling, and the lamellar and punctate labelling seen without SUR1 was no longer prominent. 5. In cells co-transfected with Kir6.2-C-GFP and SUR1, strong membrane labelling was associated with very high channel activity, with 484 +/- 311 active channels per excised patch. These K+ channels were sensitive to inhibition by ATP (IC50 = 17 microM), stimulated by ADP and inhibited by sulphonylureas. 6. We conclude that co-expression of SUR1 and Kir6.2 generates channels with the properties of native KATP channels. In addition, SUR1 promotes uniform insertion of Kir6.2-C-GFP into the plasma membrane and a 35-fold increase in channel activity, suggesting that SUR1 facilitates protein trafficking of Kir6.2 into the plasma membrane. PMID:9705987

John, S A; Monck, J R; Weiss, J N; Ribalet, B

1998-07-15

316

Elevation: a major influence on the hydrology of New Hampshire and Vermont, USA \\/ L'altitude exerce une influence importante sur l'hydrologie du New Hampshire et du Vermont, Etats-Unis  

Microsoft Academic Search

Much of New Hampshire and Vermont (combined area = 50 000 km) has hilly to mountainous topography. Elevations range from 0 to 1900 m a.s.l. (average = 360 m), and many peaks exceed 1200 m. Mean annual precipitation increases strongly with elevation (adjusted for additional orographic effects and distance from moisture sources), as do mean monthly precipitation, snow depth, and

S. LAWRENCE DINGMAN

1981-01-01

317

Influence de la dispersion de phases ceramiques sur la resistance au fluage de l'intermetallique FeAl. (Influence of ceramic dispersion on the creep strength of FeAl intermetallic).  

National Technical Information Service (NTIS)

The aim of this study was to improve the creep strength of FeAl intermetallic by dispersion of ceramic particles. The materials have been prepared either by mechanicals allowing (MA) or by attrition, both coupled with 'in situ' oxidation and followed by h...

K. Wolski

1994-01-01

318

Tantrik influence on sarngadhara.  

PubMed

Tantra and Ayurveda are interrelated, particularly during medieval period, Tantra had great impact on the theory and practice of Ayurveda. Hitherto this aspect of history is not sufficiently explored. In this paper, influence of Tantra on Sarngadhara, a representative author of the medieval period, has been vividly brought out. PMID:22557393

Sharma, P V

1984-01-01

319

Factors influencing vaccination uptake  

Microsoft Academic Search

Abstract Current Australian research on factors influencing vaccination was discussed at a workshop held at the Royal Alexandra Hospital for Children, Sydney, in March 1998, sponsored by the National Centre for Immunisation Research and Surveillance of Vaccine Preventable Diseases (NCIRS). The application of decision maki ng theory to vaccination behaviour, the expectations and experiences of mothers, and reasons why parents

Edited Jill M Forrest; Margaret A Burgess; Peter B Mcintyre

320

Workers influence royal reproduction  

PubMed Central

Understanding which parties regulate reproduction is fundamental to understanding conflict resolution in animal societies. In social insects, workers can influence male production and sex ratio. Surprisingly, few studies have investigated worker influence over which queen(s) reproduce(s) in multiple queen (MQ) colonies (skew), despite skew determining worker-brood relatedness and so worker fitness. We provide evidence for worker influence over skew in a functionally monogynous population of the ant Leptothorax acervorum. Observations of MQ colonies leading up to egg laying showed worker aggressive and non-aggressive behaviour towards queens and predicted which queen monopolized reproduction. In contrast, among-queen interactions were rare and did not predict queen reproduction. Furthermore, parentage analysis showed workers favoured their mother when present, ensuring closely related fullsibs (average r = 0.5) were reared instead of less related offspring of other resident queens (r ? 0.375). Discrimination among queens using relatedness-based cues, however, seems unlikely as workers also biased their behaviour in colonies without a mother queen. In other polygynous populations of this species, workers are not aggressive towards queens and MQs reproduce, showing the outcome of social conflicts varies within species. In conclusion, this study supports non-reproductive parties having the power and information to influence skew within cooperative breeding groups.

Gill, Richard J.; Hammond, Robert L.

2011-01-01

321

Status, Numbers and Influence  

ERIC Educational Resources Information Center

|We develop a theoretical model of social influence in n-person groups. We argue that disagreement between group members introduces uncertainty into the social situation, and this uncertainty motivates people to use status characteristics to evaluate the merits of a particular opinion. Our model takes the numerical distribution of opinions and the…

Melamed, David; Savage, Scott V.

2013-01-01

322

Gender and Social Influence  

Microsoft Academic Search

This review article reveals that men are generally more influential than women, although the gender difference depends on several moderators. Relative to men, women are particularly less influential when using dominant forms of communica- tion, whereas the male advantage in influence is reduced in domains that are tradi- tionally associated with the female role and in group settings in which

Linda L. Carli

2001-01-01

323

Factors associated with the acceptance of mass drug administration for the elimination of lymphatic filariasis in Agusan del Sur, Philippines  

PubMed Central

Background Mass drug administration (MDA) has been one of the strategies endorsed by the World Health Assembly for lymphatic filariasis (LF) elimination. Many factors, however, affect the acceptability of the MDA in the Philippines with acceptability defined as the ingestion of drugs -diethylcarbamazine and albendazole during MDA. These drugs were mainly distributed in fixed sites and mopping up activities were conducted through house-to-house visits to increase treatment coverage. The aim of conducting the study was to determine the MDA acceptance rate among a population endemic for LF, and the factors associated with MDA acceptance. Methods In April 2005, a stratified cluster survey involving 437 respondents aged 18 years old and above in Agusan del Sur, Philippines was conducted. Key informant interviews and focused group discussions were performed among community leaders and health service providers. Descriptive statistics and coverage estimates were calculated with appropriate sampling weights applied to all analyses. Factors assessed for association with receipt of antifilarial drugs and MDA acceptance were respondents' socio-demographic characteristics, knowledge, attitudes, beliefs and perceptions on LF. Pearson chi-squared test was used to determine factors associated with MDA acceptance. Results Results showed that 63.3% of the sampled population received the antifilarial drugs; of these, 94.5% ingested the drugs, yielding an acceptance rate of 60%. Half of the sampled population received the drugs from a fixed site, while only 13% was mopped up. A majority of the sampled population were aware of LF and MDA. Knowledge on LF prevention, cause, treatment and diagnosis and adverse events was low to moderate. Knowledge on LF and perceived benefits of antifilarial drugs were found to be associated with MDA acceptance (p = 0.08). Health workers remain the front liners in the MDA implementation. Local government units were aware of LF and MDA, but support was insufficient. Conclusion The proportion of the sampled population that received and ingested the antifilarial drugs was much lower than the reported coverage. The target coverage rate of 85% may be achieved with sufficient groundwork for MDA, buy-in from the local government, greater efforts exerted to increase the people's knowledge on LF and MDA and their understanding of perceived benefits of the drugs. These would contribute to the successful elimination of LF in the province.

Amarillo, Maria Lourdes E; Belizario, Vicente Y; Sadiang-abay, Jewel T; Sison, Stephanie Anne M; Dayag, Ariane Marie S

2008-01-01

324

Variabilidad de la Estación de Crecimiento en la Región Sur de Tamaulipas en condiciones climaticas actuales y futuras.  

NASA Astrophysics Data System (ADS)

El impacto de la variabilidad y cambio climáticos, afectan el potencial agrícola de la Región Sur de Tamaulipas. Además de los cambios estacionales, bajos rendimientos agrícolas, el manejo de los cultivos y las políticas locales de producción, existe la incertidumbre del mercado regional para los pequeños y grandes productores. La diversificación agrícola ha sido una alternativa para enfrentar las condiciones imperantes en esta región. Pero ésta ha provocado la fragmentación territorial, por lo que sólo algunos productores logran competir en un mercado nacional. Existe una preocupación generalizada por buscar soluciones que permitan que la población que es afectada por la inseguridad de la producción agrícola y económica, pueda adaptarse a las variaciones climáticas que afectan el proceso productivo. La seguridad alimentaría queda sujeta a la fluctuación de las importaciones para los sectores básicos y a las estrategias mercantiles de empresas trasnacionales. La percepción local sugiere un número creciente de eventos climatológicos extremos, constantes y severos en los últimos 20 años, con el aumento creciente de pérdidas económicas. El análisis se centra en la disponibilidad de agua, agregándose un aspecto de capital importancia como es la variabilidad interanual de la lluvia, que condiciona muy fuertemente el riesgo agrícola en el trópico seco, siendo ésta la que determina el momento de inicio de la estación favorable para el crecimiento y su duración. En este trabajo se han obtenido modelos de la distribución espacial de la precipitación y temperaturas, para el escenario base 1961-1990, el escenario actual 1971-2000, para algunos años El Niño y La Niña, así como para los escenarios de Cambio Climático HADLEY, ECHAM y GFDL, con escenarios A2 y B2, para las décadas de los 20s y 50s, para establecer el inicio y duración de la Estación de Crecimiento, utilizando Sistemas de Información Geográfica (ArcView). Estos resultados serán utilizados por los administradores de las decisiones locales, para estrategias de manejo y para la difusión entre los habitantes, de tal manera que esto les permita establecer prioridades en las medidas de mitigación, y formular las posibilidades de adaptación.

Medina-Barrios, M.; Conde-Alvarez, C.; Gay-Garcia, C.

2007-05-01

325

Quaternary structure of K[ssubscript ATP] channel SUR2A nucleotide binding domains resolved by synchrotron radiation X-ray scattering  

SciTech Connect

Heterodimeric nucleotide binding domains NBD1/NBD2 distinguish the ATP-binding cassette protein SUR2A, a recognized regulatory subunit of cardiac ATP-sensitive K{sup +} (K{sub ATP}) channels. The tandem function of these core domains ensures metabolism-dependent gating of the Kir6.2 channel pore, yet their structural arrangement has not been resolved. Here, purified monodisperse and interference-free recombinant particles were subjected to synchrotron radiation small-angle X-ray scattering (SAXS) in solution. Intensity function analysis of SAXS profiles resolved NBD1 and NBD2 as octamers. Implemented by ab initio simulated annealing, shape determination prioritized an oblong envelope wrapping NBD1 and NBD2 with respective dimensions of 168 x 80 x 37 {angstrom}{sup 3} and 175 x 81 x 37 {angstrom}{sup 3} based on symmetry constraints, validated by atomic force microscopy. Docking crystal structure homology models against SAXS data reconstructed the NBD ensemble surrounding an inner cleft suitable for Kir6.2 insertion. Human heart disease-associated mutations introduced in silico verified the criticality of the mapped protein-protein interface. The resolved quaternary structure delineates thereby a macromolecular arrangement of K{sub ATP} channel SUR2A regulatory domains.

Park, Sungjo; Terzic, Andre (Mayo)

2010-05-25

326

Mesure des stades de developpement du sapin baumier (Abies balsamea [L.] Mill.) par teledetection des maxima locaux sur images a tres haute resolution  

NASA Astrophysics Data System (ADS)

L'objectif principal de cette these est d'identifier les parametres cles pour lier le developpement morphologique de la cime du sapin baumier (Abies balsamea [L.] Mill.) aux patrons de reflectance qu'elle genere sur une image aerienne a haute resolution. La quantite et la distribution spatiale des aiguilles dans le sapin dependent de la structure des branches. Un mecanisme de ramification particulier (la reiteration) ressort comme le parametre cle pour lier l'augmentation de la biomasse foliaire et la forme de la branche. Les reiterats forment des agglomerats de feuillage qui engendrent des inegalites dans les patrons de reflectance de la cime. La reflectance est plus elevee ou il y a une forte concentration de reiterats (maximum local). On demontre que le developpement du sapin baumier se mesure au moyen de l'analyse des maxima locaux de la cime sur une image. La biomasse de l'arbre se mesure par la teledetection et l'analyse des patrons de reflectance de la cime, c'est-a-dire la mesure du niveau de reiteration par le decompte des maxima locaux de la cime. Cette etude demontre qu'il est possible de proceder a l'inventaire du volume de bois d'un peuplement par la teledetection de l'architecture des arbres.

Demers, Alain

327

Lasers à boîtes quantiques sur InP à 1,55 mum présentant en fonctionnement continu une puissance élevée, un très faible bruit et une longue durée de vie  

NASA Astrophysics Data System (ADS)

Nous avons étudié des lasers à boîtes quantiques ayant permis d'obtenir une puissance optique élevée de 50 mW par facette, un très faible bruit d'intensité relatif de -162 dB/Hz sur un large spectre ainsi que 7000 heures de vieillissement accéléré sans défaut ni dégradation.

Resneau, P.; Calligaro, M.; Parillaud, O.; Bansropun, S.; Krakowski, M.

2006-10-01

328

Perspective sur la prospective  

Microsoft Academic Search

Long term forecasting, as popularized by some recent models of the world, appears to be a-scientific from the standpoint of the social scientists. The basis for this radical judgment is threefold: First, structural relations incorporated into these models of the world seldom go further than stating rigid relations between some physical variables and world output. Second, the factual basis on

Jean-Luc Migué

1975-01-01

329

JURIDICTION SUR LES PRODUITS  

Center for Biologics Evaluation and Research (CBER)

Text Version... la loi PHS Act ? », il est d'abord envoyé au Tissue Reference Group (groupe de référence des tissus). Le travail de celui ... More results from www.fda.gov/downloads/biologicsbloodvaccines/internationalactivities

330

Ideas of Influence: Counsellors' Talk about Influencing Clients  

ERIC Educational Resources Information Center

|The influence the counsellor has on his or her clients is problematic both theoretically and practically. This article explores how counsellors in six focus groups talked about counsellor influence in response to a series of scenarios and questions. The counsellors adopted three main, or "core", positions about influence: "counsellors shouldn't…

Spong, Sheila Jean

2007-01-01

331

Lignes directrices canadiennes sur l'utilisation s?curitaire et efficace des opio?des pour la douleur chronique non canc?reuse  

PubMed Central

Résumé Objectif Présenter aux médecins de famille un résumé clinique pratique des lignes directrices canadiennes sur l’utilisation sécuritaire et efficace des opioïdes pour la douleur chronique non cancéreuse, produites par le National Opioid Use Guideline Group. Qualité des données Pour produire les lignes directrices, les chercheurs ont effectué une synthèse critique de la littérature médicale sur l’efficacité et l’innocuité des opioïdes pour la douleur chronique non cancéreuse et ont rédigé une série de recommandations. Un panel de 49 cliniciens experts de toutes les régions du Canada ont passé en revue l’ébauche et ont atteint un consensus sur 24 recommandations. Message principal Il est recommandé de faire un dépistage du risque de dépendance avant de prescrire des opioïdes. On recommande des opioïdes faibles (codéine et tramadol) pour une douleur de légère à modérée qui n’a pas répondu aux traitements de première intention. On peut essayer l’oxycodone, l’hydromorphone et la morphine chez les patients qui n’ont pas eu de soulagement avec des opioïdes plus faibles. Une faible dose initiale et une lente hausse du titrage sont recommandées, ainsi qu’une étroite surveillance du patient qu’on a d’abord renseigné. Les médecins doivent surveiller l’apparition de complications comme l’apnée du sommeil. La dose optimale est celle qui améliore le fonctionnement ou atténue les cotes d’évaluation de la douleur d’au moins 30 %. Pour la grande majorité des patients, la dose optimale sera bien en deçà de l’équivalent de 200 mg de morphine par jour. On recommande le sevrage progressif pour les patients qui n’ont pas répondu à un essai d’opioïdes adéquat. Conclusion Les opioïdes jouent un rôle important dans la prise en charge de la douleur chronique non cancéreuse, mais il faut en prescrire avec prudence pour limiter les dommages potentiels. Les nouvelles lignes directrices canadiennes offrent des conseils dont les médecins avaient grand besoin pour les aider à en arriver à un juste équilibre entre le contrôle optimal de la douleur et la sécurité.

Kahan, Meldon; Mailis-Gagnon, Angela; Wilson, Lynn; Srivastava, Anita

2011-01-01

332

Transport de particules massives dans un fluide turbulent: Application a l'erosion due au sable sur les parois d'une turbine hydraulique  

NASA Astrophysics Data System (ADS)

Le transport de particules massives par un champ turbulent est un vaste domaine de la mécanique des fluides. Il possède de nombreuses applications comme par exemple le transport de sable dans une turbine hydraulique. En raison de la dureté des grains de quartz et des grandes vitesses de collision avec les parois métalliques, un phénomène d'érosion intensif se produit. Les dommages résultants peuvent diminuer le rendement de la turbine au cours des quelques mois suivant la mise en opération. L'objectif de cette thèse est de mettre au point un outil permettant de prédire ces zones d'érosion. Ce projet de recherche en contexte industriel a été réalisé en collaboration avec la compagnie General Electric Hydro du Canada. Dans un régime hautement turbulent, il est possible d'obtenir une expression suffisamment générale en utilisant une formulation partiellement empirique: l'équation de Basset- Boussinesq-Oseen modifiée. Ce choix de modèle tient compte du niveau de précision recherché et de la méthode numérique employée afin de résoudre la phase fluide. Il permet aussi d'éliminer plusieurs ambiguïtés fréquemment rencontrées dans la littérature et implementées dans certains codes commerciaux courants. La formulation mathématique du problème est effectuée dans un espace mixte Euler-Lagrange. Les paramètres dynamiques sont relies au type de particules et à l'intensité de la turbulence. Le code numérique résultant est le plus performant développé à ce jour (août 1998). Les trajectoires de plusieurs centaines de milliers de particules peuvent être simulées et visualisées de manière interactive sur une station de travail (SGI R4K, R8K et R10K). L'utilisateur du logiciel est libre de se déplacer dans l'espace à l'aide d'un environnement similaire a un ``simulateur de vol''. Il peut ainsi analyser les détails du processus d'érosion de même que l'écoulement du fluide dans la turbine. Les zones d'érosion obtenues à l'aide de ce logiciel correspondent très bien avec celles observées sur le terrain. Une parallélisation à gros grain (``coarse grain parallelism'') est incluse intrinsèquement dans l'algorithme résultant. Une version du logiciel utilisant le passage de message sur un réseau hétérogène de stations de travail a été mise au point et est utilisée dans le cas de géométries de taille intermédiaire. Cette implémentation permet ainsi de rentabiliser l'utilisation des stations de travail déjà disponibles plutôt que de recourir à un serveur plus coûteux, ce qui est un avantage dans un contexte de recherche industrielle.

Bergeron, Stephen

333

Influence of water vapour and permanent gases on the atmospheric optical depths and transmittance  

NASA Astrophysics Data System (ADS)

The influence of the atmospheric state on the extinction of direct solar radiation has been studied by using a four layer atmospheric model. Simple analytical formulae are established for the spectral optical depths of permanent gases and water vapour. These formulae use the ground level values of air pressure, temperature and relative huniidity. An additional parameter, related to the vertical distribution of the hunmidity content, is used for a better estimation of the water vapour optical depth. Good agreement between theory and measurements is found. The paper shows the dependence of the atmospheric spectral transmittance on the above mentioned parameters. L'influence de l'état atmosphérique sur l'extinction de la radiation solaire directe a été étudiée à l'aide d'un modèle atmosphérique développé antérieurement par l'auteur. Des formules simples ont été établies pour l'épaisseur optique spectrale des gaz et de la vapeur d'eau. Ces formules utilisent les valeurs de la pression atmosphérique, de la température et de l'humidité relative, mesurées au niveau du sol. Un paramètre supplémentaire, lié à la distribution verticale du contenu d'humidité, est utilisé pour calculer l'épaisseur optique due à la vapeur d'eau. La théorie est en bon accord avec les résultats des mesures. Le travail montre la dépendance de la transmittance atmosphérique spectrale en fonction des paramètres spécifiés ci-dessus.

Badescu, V.

1991-05-01

334

Influence functions for distributional statistics  

Microsoft Academic Search

Social evaluation functions used in policy impact analysis can be viewed as real-valued functionals of the underlying outcome distributions. Influence functions may be used to identify the sources of variation in social outcomes in terms of individual or household characteristics. This paper sets forth in clear terms the definition of the influence function and recentered influence function, and catalogs these

B. Essama-Nssah; Peter J. Lambert

2011-01-01

335

Biological influences on obesity.  

PubMed

Severely obese children are even more likely to have mutations in obesity genes than are severely obese adults. Thus, investigators searching for obesity genes commonly focus on children, with the result that many human obesity genes were first identified in studies of children. Although the development of obesity depends on living in an obesity-promoting environment, it also is influenced strongly by individual genetic composition. Thus, the discovery of new obesity genes provides new opportunities to identify causes of severe obesity. Finally, identification of individual causes of obesity may, in the future, provide for a safe, effective, and individualized treatment recommendation for each obese person. PMID:11494641

Warden, N A; Warden, C H

2001-08-01

336

Emotional influences on singing  

Microsoft Academic Search

national grants in 9 years. She is the author of over 50 research papers, abstracts, chapters and edited books, and has presented research results at 43 conferences and been,keynote,or invited speaker,at 13 international,conferences.,Her research,interests include the neural control of voice and breathing, respiratory and laryngeal control during speech,and,singing,and,emotional,influences,on voice. She has,supervised,several,PhD and Masters,research,students,and,is currently supervising,a number,of postgraduate,students at the National,Voice

Pamela Davis

337

Paramètres biologiques de réponse tardive des tissus sains aux rayonnements ionisants  

Microsoft Academic Search

Résumé  Par leur caractère irréver sible et leur impact sur la qualité de vie, les effets secondaires tardifs des tissus sains constituent\\u000a un facteur limitant de la radiothérapie. L’irradiation est à l’origine de dérè glements biologiques multiples aboutissant\\u000a à la destruction des cellules souches, à des atteintes vasculaires et à la constitution pro gressive d’une fibrose interstitielle\\u000a qui s’aggrave avec le

A. Braccini; M. Ozsahin; D. Azria

2010-01-01

338

[In Process Citation].  

PubMed

En l'absence des moyens de chauffage moderne à domicile chez une proportion non négligeable des Marocains, le recours au moyen traditionnel est fréquent. A travers six observations de brûlures profondes des membres, particulières par leur mode de survenue et par leur gravité, les Auteurs attirent l'attention sur le danger de l'utilisation du barbecue traditionnel «majmer» pour réchauffement en milieu clos. PMID:21991072

Chraïbi, R; Moussaoui, A; Tourabi, K; Ennouhi, A; Ihrai, H; Hassam, B

2007-06-30

339

Le tourisme culturel, modèle de développement économique  

Microsoft Academic Search

Le tourisme est essentiellement une forme de développement économique qui s’appuie sur les ressources culturelles. Mais c’est aussi une forme de développement qui, bien que participant de la réalité économique, est un moyen pour les individus et les sociétés de connaître et de comprendre leurs environnements et leur passé respectifs. En tant qu’expérience à la fois instructive et gratifiante, le

George NICULESCU

2010-01-01

340

Destinations initiales et redistribution des principaux groupes d'immigrants au Canada : changements au cours des deux dernieres decennies  

Microsoft Academic Search

Cette etude examine les changements qui ont touche la concentration geographique des principaux groupes d'immigrants au Canada en ce qui a trait a leur destination initiale et redistribution subsequente au cours des deux dernieres decennies. En meme temps, elle porte sur le role des collectivites immigrantes deja etablies a l'egard du choix de leur lieu d'etablissement par les nouveaux immigrants.

Feng Hou

2005-01-01

341

L'integration asymetrique au sein du continent american: un essai de modelisation  

Microsoft Academic Search

Apres une premiere vague de regionalisation fondee sur une politique d'industrialisation par substitution aux importations, des nombreux pays en developpement s'engagent aujourd'hui dans un nouveau regionalisme selon la logique d'ouverture commerciale. Certains cherchent des associations avec des pays plus developpes afin de s'assurer un acces a leurs marches et de beneficier de leur technologies. La nouvelle vague de reionalisme est

Philippine Cour; Frederic Rupprecht

1996-01-01

342

Les instruments des politiques d'environnement  

Microsoft Academic Search

[fre] Les instruments des politiques d'environnement . Les problèmes d'environnement peuvent être ramenés à l'analyse du marché de chaque bien concerné : eau, air, espaces naturels... L'inexistence ou l'imperfection des marchés de ces ressources mène souvent à leur sur-exploitation, car le prix auquel elles sont disponibles est en général inférieur à leur coût pour la collectivité. Le dysfonctionnement d'autres marchés

Xavier Delache; Sylviane Gastaldo

1992-01-01

343

L'étiquetage environnemental des produits en magasin  

Microsoft Academic Search

Le gouvernement français envisage de mettre en place un système d'étiquetage environnemental des produits dans les points de vente. L'objectif est d'informer les consommateurs sur les conséquences de leurs consommations afin d'orienter leurs choix vers les produits les plus respectueux de l'environnement. Cet article présente les résultats d'une étude exploratoire qui montre comment l'étiquetage environnemental des produits pourrait avoir un

Yohan Bernard

2009-01-01

344

Entraide familiale, indépendance économique et sociabilité  

Microsoft Academic Search

[fre] Entraide familiale, indépendance économique et sociabilité . . Une vision optimiste de l’entraide familiale s’est diffusée depuis deux décennies au moment précis où les sociétés occidentales redécouvraient la pauvreté et s’interrogeaient sur les missions de leur État-providence. La relative modestie du volume des échanges dans la parentèle et leur absence d’effet redistributif entre milieux sociaux remettent en cause cette

Jean-Hugues Déchaux; Nicolas Herpin

2004-01-01

345

Crystallization and preliminary X-ray analysis of stationary phase survival protein E (SurE) from Xylella fastidiosa in two crystal forms.  

PubMed

The bacterium Xylella fastidiosa is a phytopathogenic organism that causes citrus variegated chlorosis, a disease which attacks economically important crops, mainly oranges. In this communication, the crystallization and preliminary X-ray crystallographic analysis of XfSurE, a survival protein E from X. fastidiosa, are reported. Data were collected for two crystal forms, I and II, to 1.93 and 2.9 Å resolution, respectively. Crystal form I belonged to space group C2, with unit-cell parameters a = 172.36, b = 84.18, c = 87.24 Å, ? = ? = 90, ? = 96.59°, whereas crystal form II belonged to space group C2, with unit-cell parameters a = 88.05, b = 81.26, c = 72.84 Å, ? = ? = 90, ? = 94.76°. PMID:22505421

dos Reis, Marcelo Augusto; Saraiva, Antonio Marcos; dos Santos, Marcelo Leite; de Souza, Anete Pereira; Aparicio, Ricardo

2012-03-28

346

Modélisation mathématique et simulation numérique de l'écoulement de l'eau à surface libre sur une pente à fond mobile  

NASA Astrophysics Data System (ADS)

Les équations de Saint-Venant modélisant l'écoulement de l'eau à surface libre sont applicables lorsque le fond du lit du canal est fixe. Dans un écoulement sur une pente à fond mobile, la cote (niveau) du fond varie selon la relation d'Exner qui est une équation de continuité pour la phase solide. Cette équation doit être couplée avec les équations de Saint-Venant qui décrivent l'écoulement de la phase liquide. Dans ce papier, le schéma de MacCormack qui est de type différence finie explicite est utilisé pour trouver une solution numérique du système couplé de Saint-Venant Exner, ce schéma qui est du second ordre est un schéma robuste pouvant capter les chocs et les discontinuités dans la solution sans aucun traitement spécial. Ce schéma est appliqué à deux processus où il y a une évolution du fond: la dégradation et l'aggradation dans les canaux alluviaux.

Abdallah, M.; Vazquez, J.; Mose, R.; Zoaeter, M.

2005-05-01

347

P?ritonites infectieuses en dialyse p?riton?ale continue ambulatoire au CHU de Rabat: profil bact?riologique sur trois ans  

PubMed Central

Introduction La péritonite infectieuse (PI) est une des complications les plus sévères et les plus fréquentes de la dialyse péritonéale (DP). But: Déterminer le taux des PI et les germes en causes, et évaluer l’efficacité des protocoles thérapeutiques entrepris chez les patients traités par DP au CHU de Rabat. Méthodes Etude rétrospective effectuée en Septembre 2009 chez tous les patients traités par DP continue ambulatoire (DPCA) au CHU de Rabat depuis l’ouverture de l’unité de DP en Juillet 2006. Ont été inclus dans cette étude, tous les patients ayant fait une péritonite. Pour tous nos patients, nous avons relevé les données cliniques, biologiques et bactériologiques. Nous avons également recherché les causes des péritonites, le délai de survenue par rapport au début de la dialyse, et la durée moyenne de formation des patients. Résultats Au cours de la période de l’étude, 28 épisodes de PI sont survenus chez 19 patients dont la moyenne d’âge est de 46±16 (19-78) ans, avec une prédominance masculine (12 hommes/ 7 femmes). Le taux des PI dans notre unité de DP est de 21.07 mois-patients calculé par le RDPLF. Leur délai de survenue par rapport au début de la dialyse au centre est de 7.9 ±8 (1-29) mois. Lors de ces PI, les bactéries à Gram négatif (BGN) ont été retrouvées dans 55% des cas, contre uniquement 45% pour les Gram positifs. Conclusion La PI est une complication grave et redoutable de la DP. Le taux de PI dans notre centre de DPCA est de 21m-p ce qui correspond au taux acceptable définie par les sociétés internationales. Les germes les plus responsables des PI dans notre centre sont les BGN et la contamination semble être manu-portée se faisant essentiellement à partir de la flore environnementale et cutanée.

Lioussfi, Zineb; Rhou, Hakima; Ezzaitouni, Fatima; Ouzeddoun, Naima; Bayahia, Rabea; Benamar, Loubna

2012-01-01

348

Morbidit? et mortalit? des nouveau-n?s hospitalis?s sur 10 ann?es ? la Clinique El Fateh-Suka (Ouagadougou, Burkina Faso)  

PubMed Central

Introduction La mortalité néonatale demeure un problème majeur de santé publique dans les pays en développement. Notre étude avait pour but de déterminer la morbidité et la mortalité des nouveau-nés à Ouagadougou, Burkina Faso. Méthodes Une étude rétrospective sur 10 années a permis d'inclure tous les nouveau-nés admis dans l'Unité de Néonatologie de la Clinique El Fateh-Suka. Résultats Au total, 697 nouveau-nés étaient hospitalisés sur la période d'étude. Les principaux diagnostics étaient les infections néonatales (23.5%), les anomalies liées à la durée de la gestation et à la croissance du fætus (17.9%) et le paludisme congénital (15.1%). Les 91 (13.1%) décès étaient dus aux anomalies liées à la durée de la grossesse et à la croissance du fætus (46.1%), à l'hypoxie intra-utérine et à l'asphyxie obstétricale (20,9%) et aux infections néonatales (17.6%). Ces décès survenaient dans 81.3% dans les 72 heures, dans 93.4% des cas dans la première semaine d'hospitalisation. Le facteur de risque associé à ces décès était la voie basse d'accouchement (p = 0.02). Conclusion Cette étude a identifié des pathologies évitables déjà décrites comme les principales causes d'hospitalisations et de décès néonatals. La voie basse d'accouchement était le facteur de risque associé à ces décès, ce qui n'avait pas encore été rapporté. Les efforts pour améliorer la qualité des services de soins périnatals doivent être intensifiés afin de réduire la mortalité néonatale dans les pays en développement.

Nagalo, Kisito; Dao, Fousseni; Tall, Francois Housseini; Ye, Diarra

2013-01-01

349

Late Cretaceous shortening and early Tertiary shearing in the central Sierra Madre del Sur, southern Mexico: Insights into the evolution of the Caribbean-North American plate interaction  

NASA Astrophysics Data System (ADS)

A wide region in the central part of the Sierra Madre del Sur (SMS), southern Mexico, records two deformational phases between the Late Cretaceous and early Tertiary. The first is a progressive approximately E-W shortening phase that spans from the Coniacian to earliest Paleocene and involves deformation of Cretaceous marine sedimentary units. The second phase corresponds to Paleocene to early Eocene deformation that also affects continental sediments and is characterized by gentle folding and counterclockwise rotation of previous shortening structures associated with strike-slip faulting. Here we present geologic, geochronologic, and structural data of two key areas of the Sierra Madre del Sur, the Guerrero-Morelos Platform (GMP), and the Huajuapan-Tamazulapan area in western Oaxaca to describe the geometry, kinematics, and timing of the Late Cretaceous and early Tertiary deformation. Two regional magmatic episodes constrain the deformational history: (1) the first between the Maastrichtian and the Paleocene (68-57 Ma) documents the end of Late Cretaceous shortening in the GMP; and (2) the second between the late Eocene and early Oligocene (37-29 Ma) has a more regional distribution. The time and space analysis of deformation and magmatism in southern Mexico led us to exclude flat subduction or collision of the Guerrero terrane to the west as the cause for Late Cretaceous shortening in the GMP. Considering the similarity in the time and style of deformation with that of the northern Chortis block, we favor an interpretation in which the tectonic evolution of the central and eastern SMS is the result of progressive interaction of the Caribbean plate with the southernmost edge of North America since the Late Cretaceous.

Cerca, Mariano; Ferrari, Luca; López-MartíNez, Margarita; Martiny, Barbara; Iriondo, Alexander

2007-06-01

350

Implémentation de la Méthode des Eléments de Frontière pour les problèmes de magnétostatique 3D sur architecture parallèle à mémoire distribuée  

NASA Astrophysics Data System (ADS)

Linear and homogeneous problems of the 3D Magnetostatics are of a Poisson or Laplace type. In this case, the Boundary Element Method is a technique which often offers, among others, important advantages over “domain” types solutions, such as finite elements since it provides a great economy in computing time and memory amount. However, when the geometry is complex, a dense mesh is required, leading to a large linear system, of which the forming and solving times should be reduced. The Parallel Computing techniques offer new efficient tools in this respect. Our study is devoted to the presentation and the comparison of different parallel implementations of the Boundary Element Method for the 3D Poisson problems on multiprocessor computers with distributed memory. Experimental results are obtained on a Meiko Computing Surface with 32 T800 transputers. Les problèmes linéaires tridimensionnels de type Poisson ou Laplace que l'on rencontre en Magnétostatique se traitent souvent avec une grande économie de calcul et d'espace mémoire notamment par la Méthode des Eléments de Frontière en comparaison avec la Méthode des Eléments Finis. Cependant, quand la géométrie des domaines est complexe, un maillage de frontière dense devient nécessaire et il importe alors de minimiser les temps de construction et de résolution du système d'équations linéaires associé. Les techniques de calcul parallèle qui se développent actuellement offrent une solution très intéressante face aux limitations imposées par la modélisation numérique elle-même et la vitesse de traitement des ordinateurs classiques. L'objet du présent papier est d'étudier diverses stratégies d'implémentation parallèle de la Méthode des Eléments de Frontière appliquée au problème de Poisson 3D sur architecture multiprocesseurs à mémoire distribuée. Des résultats expérimentaux sont obtenus sur une surface de calcul Meiko composée de 32 transputers T800 et d'une station SUN qui assure la fonction d'hôte.

Lobry, Jacques; Daoudi, El Mostafa

1992-11-01

351

Petrology and Sr-Nd-Pb-He isotope geochemistry of postspreading lavas on fossil spreading axes off Baja California Sur, Mexico  

NASA Astrophysics Data System (ADS)

Postspreading volcanism has built large seamounts and volcanic ridges along the short axes of a highly segmented part of the East Pacific Rise crest that ceased spreading at the end of the middle Miocene, offshore Baja California Sur, Mexico. Lava samples from Rosa Seamount, the largest volcano, are predominantly alkalic basalts, mugearites, and benmoreites. This lavas series was generated through fractional crystallization and is compositionally similar to the moderately alkalic lava series in many oceanic islands. Samples from volcanic ridges at three adjacent failed spreading axes include mildly alkalic, transitional, and tholeiitic basalts and differentiated trachyandesites and andesite. The subtle but distinct petrologic and isotopic differences among the four sites may be due to differences in the degree of partial melting of a common, heterogeneous source. Postspreading lavas from these four abandoned axes off Baja California Sur together with those from other fossil spreading axes and from seamount volcanoes that grew on the East Pacific Rise flanks define a compositional continuum ranging from normal mid-ocean ridge basalt (NMORB)-like to ocean island basalt (OIB)-like. We propose that the compositional spectrum of these intraplate volcanic lavas is due to different degrees of partial melting of the compositionally heterogeneous suboceanic mantle in the eastern Pacific. A large degree of partial melting of this heterogeneous mantle during vigorous mantle upwelling at an active spreading center produces NMORB melts, whereas a lesser degree of partial melting during weak mantle upwelling following cessation of spreading produces OIB-like melts. The latter melts have a low (<8 RA) 3He/4He signature indicating their formation is different from that of OIBs from major "hot spot" volcanoes in the Pacific with high 3He/4He ratios, such as Hawaii and Galapagos.

Tian, Liyan; Castillo, Paterno R.; Lonsdale, Peter F.; Hahm, Doshik; Hilton, David R.

2011-02-01

352

Impact des conditions de conduite sur l'efficacite des pots catalytiques de véhicules a essence et diésel  

Microsoft Academic Search

Various driving conditions determine major changes in IC-engined vehicles polluting emissions. The generalized use of three-way catalysts on gasoline-engined vehicles and, in the near future, oxidation catalysts on diesel-engined vehicles, is likely to enable the control of such changes. Thus, the influence of driving conditions on the efficiency of such devices was studied in a research program proposed by RENAULT

Ph. Pornet; C. Beaubestre; Y. Courtois; B. Festy; H. Ing; B. Lopez; J. L. Marduel; P. Beurdouche; M. Chevrier; M. Hublin; G. Jouvenot; M. Lalière; C. Tarrière

1995-01-01

353

Outbursts formation on low carbon and trip steel grades during hot-dip galvanisation  

NASA Astrophysics Data System (ADS)

Low carbon and TRIP grade steels have been hot dip galvanised in order to study outbursts formation. Microstructure and texture of intermetallic phases have been observed after selective electrochemical etching by scanning electron microscopy. Potential versus time (chronopotentiometric) characteristics were recorded in order to monitor surface modifications. This combination of techniques enable to quantify and observe intermetallic phase one by one. The overall thickness of coating on both substrates are similar. However, microstructures of Fe-Zn intermetallic phases are very different on both grades. In particular, the V phase is dense on standard steel but develops a highly branched filament structure on TRIP steel. The transformation of V phase to d and G1 are limited on TRIP steel. Differences of texture provide clues for understanding mechanisms of formation of outbursts. They can account for the differences of mechanical properties and corrosion resistance. Silicon from the substrate influences the reactivity of TRIP steels due to capping and local reactions. La formation des outbursts a été étudiée sur un acier bas carbone et sur un acier TRIP galvanisés. Les épaisseurs des revêtements sont similaires. Néanmoins, les observations microscopiques et les érosions électrochimiques montrent que la répartition des phases intermétalliques et leurs microstructures diffèrent sensiblement en fonction de la nature du substrat. Ces différences expliquent les propriétés mécaniques et anticorrosions. L’encapsulation de la surface par les oxydes de silicium freine la transformation de la phase dzêta en delta et gamma sur l’acier TRIP.

Petit, E. J.; Lamm, L.; Gilles, M.

2004-12-01

354

Comprendre les representations du personnel soignant face aux infections nosocomiales au Clostridium difficile au Quebec pour mieux en promouvoir la sante.  

PubMed

Au cours des dernières années, la transmission des infections nosocomiales, notamment des infections à Clostridium difficile, est devenue une importante préoccupation au Québec. Pour éviter leur transmission, les experts recommandent notamment la formation du personnel. Dans cet article, nous décrivons la représentation que se font certaines catégories de personnel de la santé à propos des risques reliés à la transmission du Clostridium difficile et leur perception des messages de prévention, afin d'identifier des avenues permettant de contribuer à cette formation. Nous avons effectué 27 entrevues et 186 heures d'observation auprès d'infirmières, infirmières auxiliaires, préposés aux bénéficiaires et préposés à l'entretien sanitaire expérimentés, dans deux unités de soins de courte durée et deux de longue durée d'un hôpital à Montréal. Résultats : le personnel se préoccupe de la transmission du C difficile envers les patients et envers leurs propres familles davantage que des conséquences immédiates sur leur propre santé. Les pratiques pour éviter de transporter le microorganisme à leur maison sont décrites. Malgré l'application de mesures de prévention, certains participants pensent s'être contaminés et être porteurs sains du C difficile, qui persisterait dans leur organisme et pourrait s'activer s'ils sont affaiblis ou sous antibiotiques. Cette contamination surviendrait à cause de situations mettant en échec la prévention : les patients non diagnostiqués et les délais de diagnostic, un manque de formation sur les mesures de prévention et sur les mesures pratiques pour les appliquer et un manque d'information sur les produits désinfectants, ces deux dernières mesures affectant surtout les préposées aux bénéficiaires. Nous concluons sur la nécessité de prendre en compte les préoccupations du personnel dans les interventions éducatives ; de formations pratiques, adaptées au travail et sur le besoin d'information quant aux raisons de changements de produits. PMID:23986384

Seifert, Ana María; O'Neill, Michel

2013-09-01

355

Influence of External Fields  

NASA Astrophysics Data System (ADS)

The application of external fields provides a powerful tool to investigate a large variety of properties of excitons and exciton related processes. Within this chapter, we focus on the fundamental effects of static magnetic and strain fields on the optical properties of excitons in ZnO. The description is complemented by relevant examples. A general review of this topic can be found for constant fields in [Cho, Excitons, Topics in Current Physics, vol. 14 (Springer, Heidelberg, 1979)] and Hönerlage et al. [Phys. Rep. 124:161, 1985] and for modulation techniques in [Cardona, Modulation Spectroscopy (Academic, New York, 1969); Seraphin, Modulation Spectroscopy (North Holland, Amsterdam, 1973); Goldsmith, NATO Science Series II, Frontiers of Optical Spectroscopy, vol. 168 (Springer Netherlands, 2005)]. Not much has been published on the influence of static electric fields on excitons. A few references are given at the end of Sect. 8.2.

Wagner, M. R.; Hoffmann, A.

356

Influence of the scholar.  

PubMed Central

Among the factors which will influence the emerging roles of medical libraries will be the changing needs of the medical scholars who use them. The effectiveness of the medical practitioner will be determined to an increasing extent by his capacity to mobilize information with a rapidity sufficient to permit its application in day-to-day decision-making. The practice of medicine is becoming an increasingly academic pursuit. The library and the librarian will, therefore, become more directly involved in the practice of medicine, and the library will be a more crucial resource in providing superior patient-care. Changes in undergraduate and continuing medical education will make new demands on the library. These and other related developments will create new functions, new problems, and new opportunities for the librarian.

West, K M

1968-01-01

357

Power, Influence Tactics, and Influence Processes in Virtual Teams  

ERIC Educational Resources Information Center

|Current studies of power, influence tactics, and influence processes in virtual teams assume that these constructs operate in a similar manner as they do in the face-to-face (FtF) environment. However, the virtual context differs from the FtF environment on a variety of dimensions, such as the availability of status cues. The differences between…

Boughton, Marla

2011-01-01

358

Microstructural influences on the  

NASA Astrophysics Data System (ADS)

The influence of tungsten content, swaging, and grain size on the dynamic behavior of commercially available tungsten-nickel-iron (W-Ni-Fe) alloys has been examined using the compression Kolsky bar. The observed flow stresses increase with increasing tungsten content and with degree of swaging but are essentially independent of grain size for these compressive deformations. Further, the flow stresses sustained by these materials have a distinct dependence on strain rate, in that the flow stress increases by at least 20 pct over a range from 10-4 s-1 to 7 × 103 s-1. The rate sensitivity itself increases with increasing tungsten content. The rate sensitivity of the alloy with the highest tungsten content (97 pct W) appears to be essentially the same as that of pure polycrystalline tungsten. In addition to showing greater strain hardening, the unswaged alloy also shows a much higher rate dependence than the swaged alloys, with the flow stress almost doubling when the rate of deformation increases from quasistatic to 5 X 103 s-1. The rate-hardening mechanism within the composite appears to be essentially that as- sociated with the tungsten grains; however, the matrix contribution is significant in the case of an unswaged alloy.

Ramesh, K. T.; Coates, R. S.

1992-09-01

359

Étude des chimisorptions de H2 et de CO sur un catalyseur Ru/Al2O3 en relation avec l'hydrogénation isotherme d'espèces carbonées adsorbées  

NASA Astrophysics Data System (ADS)

H2 and CO chemisorptions, on a reduced 3.5% Ru/Al2O3 catalyst, are studied by Temperature Programmed Desorption (TPD) and FTIR spectroscopy. The H2 chemisorption is an activated process. The amount of the irreversibly adsorbed species at saturation of the surface is 76?molH2/g.cat. attributed to two adsorbed species. The adsorption of CO is not activated. The FTIR spectra show that various adsorbed species are formed. The main species is the linear CO species. The CO adsorption after an initial hydrogen chemisorption leads to the desorption of 52% of the amount of adsorbed hydrogen. At the opposite, CO is not desorbed if the adsorption of hydrogen is performed on a surface which is initially saturated with CO. In this case, the H2 chemisorption involves other sites than the ones of the reduced surface. Les chimisorptions de H2 et de CO, individuelles et séquentielles (adsorption de H2 puis de CO et adsorption de CO puis de H2), sur un catalyseur Ru/Al2O3 réduit sont étudiées par Désorption à Température Programmée et par spectroscopie IRTF. Il est montré que le CO déplace une fraction importante de l'hydrogène préadsorbé mais que l'hydrogène peut être adsorbé sur une surface ayant adsorbé du CO sans déplacement des différentes formes adsorbées de CO. Les résultats sont interprétés en considérant que les sites adsorbant l'hydrogène sur une surface libre sont différents de ceux mis en jeu sur une surface ayant adsorbé le CO.

Nawdali, M.; Ahlafi, H.; Bianchi, D.

1999-04-01

360

Social influence, creativity and innovation  

Microsoft Academic Search

We review research on the social influences on creativity. The main focus is on recent research on group and team creativity and the implications of this research for organizational creativity. We propose a broad model of the role of the cognitive, motivational, and social processes involved in creativity and innovation. Using this model as a framework, we highlight the influence

Paul B. Paulus; Mary Dzindolet

2008-01-01

361

How leaders influence organizational effectiveness  

Microsoft Academic Search

The flexible leadership theory explains how top executives and other leaders can influence the financial performance of a business organization. Three key determinants of financial performance are efficiency, adaptation, and human capital. A wide range of leadership behaviors, management programs, structural forms, and external initiatives can be used to influence these performance determinants. Management programs and systems are usually more

Gary Yukl

2008-01-01

362

Wetland Research Can Influence Policy  

EPA Science Inventory

An objective of ecological research is to have a positive influence on the way natural resources are managed. The ability to influence policy with science depends on collaboration with the appropriate audience, identification of a relevant question, and awareness of the framewor...

363

Influence of arthropods on ecosystems  

Microsoft Academic Search

Arthropod interactions with plants and microbes influence the amounts of living and dead organic matter and transfers of nutrients in terrestrial ecosystems. Arthropods in the canopy have their greatest effect on mobile elements such as potassium, whereas soil detritivores influence mineralization rates of less mobile elements such as nitrogen, phosphorus, and calcium. Nominal (baseline) herbivory and detritivory combine to speed

T. R. Seastedt; D. A. Jr. Crossley

1984-01-01

364

Strategies to influence PVR development  

Microsoft Academic Search

Proliferative vitreo-retinopathy (PVR) is a complication of rhegmatogenous retinal detachment or severe ocular trauma (intraocular foreign body, penetration, perforation, contusion, rupture). The risk of PVR varies from 10 to 40% depending on the original disease. Strategies to influence the risk of PVR include surgical techniques, pharmacological adjuncts, and preventive measurements. Surgical influences on the risk of PVR comprise: surgical skills

Bernd Kirchhof

2004-01-01

365

Stable grasp under external influences  

Microsoft Academic Search

In object manipulation or material handling, the grasped object becomes unstable when external impacts exist. However, previous studies on grasping analysis seldom address such problems as the object is influenced by the external impacts. In this paper, we investigate the grasping stability and optimality issues under the influence of external disturbances. A rotation-displacement geometry model is used in analyzing the

Maw-Kae Hor; Shiaw-Chian Wu

1997-01-01

366

The influence of poverty and culture on the transmission of parasitic infections in rural nicaraguan villages.  

PubMed

Intestinal parasitic infections cause one of the largest global burdens of disease. To identify possible areas for interventions, a structured questionnaire addressing knowledge, attitude, and practice regarding parasitic infections as well as the less studied role of culture and resource availability was presented to mothers of school-age children in rural communities around San Juan del Sur, Nicaragua. We determined that access to resources influenced knowledge, attitude, and behaviors that may be relevant to transmission of parasitic infections. For example, having access to a clinic and prior knowledge about parasites was positively correlated with the practice of having fencing for animals, having fewer barefoot children, and treating children for parasites. We also found that cultural beliefs may contribute to parasitic transmission. Manifestations of machismo culture and faith in traditional medicines conflicted with healthy practices. We identified significant cultural myths that prevented healthy behaviors, including the beliefs that cutting a child's nails can cause tetanus and that showering after a hot day caused sickness. The use of traditional medicine was positively correlated with the belief in these cultural myths. Our study demonstrates that the traditional knowledge, attitude, and practice model could benefit from including components that examine resource availability and culture. PMID:22934154

Karan, Abraar; Chapman, Gretchen B; Galvani, Alison

2012-08-15

367

Dietary influences on neurotransmission.  

PubMed

Diet clearly influences neurotransmission. This can be important in grossly undernourished children. It can also be important in children in whom normal homeostatic mechanisms governing food intake are bypassed. Subtle differences in behavior can occur with physiologic variation in food intake. Components of foods can also be used as drugs. Starvation can impair neuronal maturation and can have lasting effects upon behavior and intellectual performance. The extent of starvation's impact upon the brain depends upon whether undernutrition occurred during a critical phase in brain development. Short-term fasting has small, but significant, effects upon intellectual performance. Even when gross malnutrition is not present, subtle changes in diet may modulate brain function. Tryptophan, tyrosine, and choline in the diet are used as precursors for neuronal synthesis of serotonin, dopamine and norepinephrine, and acetylcholine, respectively. It is likely that the brain's sensitivity to certain components of the diet exists to permit monitoring of food intake by the central nervous system. Tryptophan, tyrosine, and choline may be useful in treatment of humans with sleep disorders, pain depression, mania, hypertension, shock, or dyskinesias. Other components of the diet that may affect behavior include food additives, sugar, and caffeine. Food additives may exacerbate hyperactive symptoms in a small proportion of children with attention deficit disorder. Given that there is little potential for harm and that there is a subpopulation that may respond, a trial of a diet that contains no food additives may be a valid diagnostic approach for children with attention deficit disorder who do not respond to stimulant therapy or for children for whom stimulant therapy is not desired. Refined sugar has been blamed for many behavioral abnormalities. Subtle effects of carbohydrate upon behavior have been reported, but the existing data do not support the hypothesis that sucrose or fructose exert special effects upon neurotransmission. Caffeine is easily detected as a stimulant by humans, but it has little effect upon cognitive function. Administration of large doses of vitamins has no beneficial effect in most humans with schizophrenia, attention deficit disorder, autism, Down's syndrome, or drug addiction. Large doses of niacinamide may even be harmful, as they may cause hepatic damage. PMID:3026151

Zeisel, S H

1986-01-01

368

Lunar Influences On Climate  

NASA Astrophysics Data System (ADS)

Popular beliefs on the effects of the Moon on the weather probably go back to when ancient civilisations followed a lunar calendar, and the Moon went from being a purely temporal reference to becoming a causal reference. The incoming heat flow on the Earth may vary slightly after solar activity. to and generate considerable effects. The light reflected from the Moon has also been hypothesised as a cause, but the associated energy is too small. The anomalistic period of the Moon (i.e., 27.5 days) coincides substantially with that of the sunspots found on the 17-18th parallel of the heliocentric latitude. Climatic modulation which lasts for around 27.5 days should be related to solar activity, which supplies energy with an amount of two orders of magnitude greater than the lunar-reflected energy. Another mechanism responsible for climatic variations is the redistribution of heat on the Earth. The Moon with the tides induces movement of the water masses of the oceans and with this there is a transport of heat. Semidiurnal lunar tides have been identified, although with modest impact, in the atmospheric pressure, the wind field and the precipitation. On a monthly time scale, variation of daily precipitation data shows that gravitational tides do indeed affect heavy rainfalls more than mean precipitation values. On the longer time scale, several authors have identified the 18.6-yr nutation cycle, which is clearly visible in several data analyses, but often it cannot be easily distinguished from the 19.9 Saturn-Jupiter cycle and the quasi-regular 22-yr double sunspot cycle which at times may be dominant. In the time scale of centuries, covering a number of periods with minimum solar activity, an analysis of meteorological data has demonstrated that only the Spörer Minimum (A.D. 1416-1534) was characterised by climatic anomalies., whereas the other periods had no singularities, or else the weak climate forcing was covered or masked by other factors, leaving the question still open. In practice, lunar and solar influences can be found and have been demonstrated with more or less the same level of confidence. Both have the same order of magnitude, and are generally weak, interacting, and being often masked by local effects.

Camuffo, Dario

369

Social influence: compliance and conformity.  

PubMed

This review covers recent developments in the social influence literature, focusing primarily on compliance and conformity research published between 1997 and 2002. The principles and processes underlying a target's susceptibility to outside influences are considered in light of three goals fundamental to rewarding human functioning. Specifically, targets are motivated to form accurate perceptions of reality and react accordingly, to develop and preserve meaningful social relationships, and to maintain a favorable self-concept. Consistent with the current movement in compliance and conformity research, this review emphasizes the ways in which these goals interact with external forces to engender social influence processes that are subtle, indirect, and outside of awareness. PMID:14744228

Cialdini, Robert B; Goldstein, Noah J

2004-01-01

370

A conserved tryptophan at the membrane-water interface acts as a gatekeeper for Kir6.2/SUR1 channels and causes neonatal diabetes when mutated  

PubMed Central

Abstract We identified a novel heterozygous mutation, W68R, in the Kir6.2 subunit of the ATP-sensitive potassium (KATP) channel, in a patient with transient neonatal diabetes. This tryptophan is absolutely conserved in mammalian Kir channels. The functional effects of mutations at residue 68 of Kir6.2 were studied by heterologous expression in Xenopus oocytes, and by homology modelling. We found the Kir6.2-W68R mutation causes a small reduction in ATP inhibition in the heterozygous state and an increase in the whole-cell KATP current. This can explain the clinical phenotype of the patient. The effect of the mutation was not charge or size dependent, the order of potency for ATP inhibition being WSUR1. In different Kir crystal structures the residue corresponding to W68 adopts two distinct positions. In one state, the tryptophan lies in a position that would impede movement of transmembrane domain 2 (TM2) and opening of the gate. In the other state, it is flipped out, enabling movement of TM2. We therefore hypothesise that W68 may act as a molecular ‘gatekeeper’ for Kir channels.

Mannikko, Roope; Stansfeld, Phillip J; Ashcroft, Alexandra S; Hattersley, Andrew T; Sansom, Mark S P; Ellard, Sian; Ashcroft, Frances M

2011-01-01

371

Biomagnification of mercury and its antagonistic interaction with selenium in yellowfin tuna Thunnus albacares in the trophic web of Baja California Sur, Mexico.  

PubMed

Mercury and selenium concentrations were determined in muscle of 37 yellowfin tuna (Thunnus albacares) captured aboard of Mexican purse-seiners boats off western coast of Baja California Sur, between Punta Eugenia and Cabo Falso, from October to December 2006. Also, its prey (mainly, jumbo squid Dosidicus gigas and pelagic red crab Pleuroncodes planipes) were analyzed from the stomach contents. All the mercury values obtained were lower that mercury content recommended by standard legal limits for seafood adopted by Mexican norms (typically 0.5-1.0?g g(-1)). Mercury concentrations vary between 0.06 and 0.51?g g(-1) in yellowfin tuna, and from 0.01 to 0.20?g g(-1) in its prey, suggesting that mercury can accumulate in prey tissues and that of their predator. Biomagnification factors (BMF) between predator-prey associations were calculated. The BMFs were >1, indicating that mercury biomagnifies along the food web of yellowfin tuna. In all species studied there was a molar excess of selenium over mercury. The rank order of mean selenium/mercury molar ratios was for pufferfish (42.62)> diamond squid (15.09)>yellowfin tuna (10.29)>pelagic red crab (10.05)>panama lightfish (9.54)> jumbo squid (8.91). The selenium health benefit value (Se-HBV) was calculated to have an improved understanding of the health benefits and risk of fish consumption. PMID:23059106

Ordiano-Flores, Alfredo; Rosíles-Martínez, Rene; Galván-Magaña, Felipe

2012-10-08

372

ORGANIC MULCH AND GRASS COMPETITION INFLUENCE TREE ROOT DEVELOPMENT  

Microsoft Academic Search

Root density, soil moisture content and soil ox- ygen diffusion rate (ODR) were measured under three soil sur- face treatments—grass, organic mulch and bare soil. Seven tree species were tested, green ash, little-leaf linden, pin oak, red oak, sugar maple, red maple and Norway maple. All trees were approximately 20 years old. Elimination of the grass resulted in consistent increases

Gary W. Watson

373

Human Factors Influencing Decision Making.  

National Technical Information Service (NTIS)

This report supplies references and comments on literature that identifies human factors influencing decision making, particularly military decision making. The literature has been classified as follows (the classes are not mutually exclusive): features o...

P. A. Jacobs D. P. Gaver

1998-01-01

374

Genetic influences on brain structure  

Microsoft Academic Search

Here we report on detailed three-dimensional maps revealing how brain structure is influenced by individual genetic differences. A genetic continuum was detected in which brain structure was increasingly similar in subjects with increasing genetic affinity. Genetic factors significantly influenced cortical structure in Broca's and Wernicke's language areas, as well as frontal brain regions (r2MZ > 0.8, p < 0.05). Preliminary

Tyrone D. Cannon; Katherine L. Narr; Theo van Erp; Veli-Pekka Poutanen; Matti Huttunen; Jouko Lönnqvist; Carl-Gustaf Standertskjöld-Nordenstam; Jaakko Kaprio; Mohammad Khaledy; Rajneesh Dail; Chris I. Zoumalan; Arthur W. Toga; Paul M. Thompson

2001-01-01

375

Tonal expectations influence pitch perception  

Microsoft Academic Search

In this study, we investigated the influence of tonal relatedness on pitch perception in melodies. Tonal expectations for\\u000a target tones were manipulated in melodic contexts while controlling sensory expectations, thus allowing us to assess specifically\\u000a the influence of tonal expectations on pitch perception. Three experiments provided converging evidence that tonal relatedness\\u000a modulates pitch perception in nonmusician listeners. Experiment 1 showed,

F. Marmel; B. Tillmann; W. J. Dowling

2008-01-01

376

Tidal influence within Pennsylvanian sandstones  

SciTech Connect

Within Pennsylvanian-age strata of the Illinois basin, large-scale linear sand bodies have been previously interpreted as fluvial and deltaic in origin. Nonetheless, analyses of fine-scale sedimentology and bed forms within such sandstones and the associated shales indicate that tidal processes greatly influenced the depositional environments within such lithofacies. Recent work on Mid-Continent Pennsylvanian-age sandstones indicates the occurrence of similar depositional environments. Based upon the pervasive tidal influence observed within such strata, environmental analogs other than fluvial and deltaic bear consideration. In general, tidally influenced estuarine models seem particularly appropriate. Within such settings, the changeover from a fluvially dominated deposystem to tidally influenced estuary occurs during transgressive phases. Despite the tidal influence that can be interpreted from the sedimentology, the strata contain few, if any, marine indicators because of the low salinities that occurred during deposition. Ongoing work in the Mid-Continent indicates that Morrowan, Atokan, Desmoinesian, Missourian, and Virgilian sands share a number of similarities with the tidally influenced environments delineated in the Illinois basin studies. Thus a tidal/estuarine interpretation might be a generalizable model for many Pennsylvanian sandstones. In addition, enhanced understanding of the siliciclastic parts of Mid-Continent cyclothems provides a more useful framework for documentation of carbonate/siliciclastic interrelationships. Oscillations of carbonate/siliciclastic environments may be more readily explainable by climatic cycles rather than by traditionally popular depth-related facies models.

Archer, A.W. (Kansas State Univ., Manhattan (United States))

1991-08-01

377

16 CFR 1107.24 - Undue influence.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 false Undue influence. 1107.24 ...Certification of Children's Products § 1107.24 Undue influence. (a) Each...procedures required in paragraph (a...the requirements in this section regarding avoiding undue influence, the...

2013-01-01

378

Engagement et persuasion par la peur: vers une communication engageante dans le domaine de la santé  

Microsoft Academic Search

Depuis plus de cinquante ans, des recherches ont montré les effets de la peur sur les attitudes et les comportements. L'expérience rapportée dans cet article visait à tester l'effet de l'engagement sur une tentative de persuasion ultérieure, en l'occurrence après la lecture d'un message anti-alcool. Il s'agissait d'amener des buveurs d'alcool, faiblement et fortement engagés dans leur comportement de consommation,

Fabien Girandola; Fabienne Michelik

2008-01-01

379

La place de la culdoscopie en gynécologie  

Microsoft Academic Search

Resume  A la lumière de leur expérience portant sur près de 300 culdoscopies les auteurs insistent sur queiques points concernant:\\u000a la technique, le soin rigoureux dans la sélection, très stricte des malades et deur préparation pour assurer la réussite de\\u000a la méthode, la désinfection très soignée et l'asepsie des gestes chirurgicaux pour réduire les risques infectieux, secondaires.\\u000a \\u000a Les auteurs apprécient surtout

R. Darmailiacq; G. Brun; Ph. Gaussen; A. Audebert

1974-01-01

380

Communication environnementale et coût des fonds propres : Le cas des entreprises du SBF120  

Microsoft Academic Search

Quel est l'impact sur le coût des fonds propres des divulgations volontaires d'informations environnementales ? C'est à cette question de recherche que nous tentons ici de répondre. L'étude empirique porte sur un échantillon de 119 entreprises cotées du SBF120. La majorité de ces entreprises consacre en 2006 un chapitre ou une partie au domaine environnemental dans leur rapport annuel tandis

Frédérique Dejean; Isabelle Martinez

2008-01-01

381

Les différences de carrières salariales à partir du premier emploi  

Microsoft Academic Search

[fre] Les trajectoires salariales dans le secteur privé se différencient dès le premier emploi durable. Les salariés ont, en effet, des débuts de carrière très différents, soit parce qu’ils reflètent certaines caractéristiques qui leur sont propres et sur lesquelles on ne dispose pas d’informations, soit du fait du hasard et de la date d’insertion sur le marché du travail, parce

Sylvie Le Minez; Sébastien Roux

2002-01-01

382

Dimensions of Grandparent-Adult Grandchild Relationships: From Family Ties to Intergenerational Friendships  

Microsoft Academic Search

RESUME ´ Cet article porte sur le phenomene demographique croissant des relations entre les grands-parents et leurs petits-enfants d'age adulte, selon les perspectives des deux generations. Ala lumiere d'entrevues qualitatives portant sur les cycles biologiques (n = 37), cette recherche etudie les significations subjectives de ces relations, ainsi que les experiences vecues par les grands-parents et les petits-enfants d'age adulte.

Candace L. Kemp

2005-01-01

383

Détermination du régime des feux en milieu de savane à Madagascar à partir de séries temporelles d'images MODIS  

Microsoft Academic Search

Dans les milieux de savanes, l'identification des surfaces brûlées et leur suivi sont des informations essentielles pour assurer une bonne gestion et conservation de ces écosystèmes. L'approche choisie repose sur l'analyse de séries temporelles d'images de télédétection à moyenne résolution spatiale. Les savanes étudiées sont situées sur le bassin versant de Marovoay au nord-ouest de Madagascar : elles présentent la particularité

Anne Jacquin; Véronique Cheret; David Sheeren; Gérard Balent

2011-01-01

384

Effets des non-linéarités et de la dispersion thermique sur la convection naturelle en milieu poreux confiné  

NASA Astrophysics Data System (ADS)

This study deals with the numerical simulation of natural convection for saturated porous media enclosed in a differentially heated, two-dimensional, rectangular cavity. A finite volume solution procedure is used to solve the Darcy model with one energy equation, including the Brinkman and the Forchheimer extensions. The numerical results show that the introduction of the viscous and inertia terms leads to a significant reduction of the heat transfer. Then thermal dispersion in the porous medium is taken into account through a semi-empirical law of variation of the effective thermal conductivity as a linear function of the local filtration velocity. The computations show that thermal dispersion increases the heat transfert through the porous medium : this influence compensates the reduction due to the Bririkman and Forchheimer terms and leads to a better agreement with the available experimental data. Ce travail présente une étude numérique de la convection naturelle dans un milieu poreux saturé, confiné dans une cavité rectangulaire verticale (2D), chauffée différentiellement. Nous utilisons une méthode de volumes finis pour résoudre le modèle de Darcy à une seule équation d'énergie avec les extensions de Brinkman et de Forchheimer. Les résultats obtenus montrent que les effets de viscosité et d'inertie réduisent notablement le transfert de chaleur. Nous introduisons la dispersion thermique en considérant que la conductivité thermique effective du milieu poreux est une fonction linéaire du module de la vitesse. Les simulations montrent que la prise en compte de la dispersion thermique augmente le transfert de chaleur et que sa contribution est relativement importante par rapport à celles des effets de viscosité et d'inertie.

Beji, H.

1993-02-01

385

Extracellular links in Kir subunits control the unitary conductance of SUR/Kir6.0 ion channels.  

PubMed

Potassium (K+) channels are highly selective for K+ ions but their unitary conductances are quite divergent. Although Kir6.1 and Kir6.2 are highly homologous and both form functional K+ channels with sulfonylurea receptors, their unitary conductances measured with 150 mM extracellular K+ are approximately 35 and 80 pS, respectively. We found that a chain of three amino acid residues N123-V124-R125 of Kir6.1 and S113-I114-H115 of Kir6.2 in the M1-H5 extracellular link and single residues M148 of Kir6.1 and V138 of Kir6.2 in the H5-M2 link accounted for the difference. By using a 3D structure model of Kir6.2, we were able to recognize two independent plausible mechanisms involved in the determination of single channel conductance of the Kir6.0 subunits: (i) steric effects at Kir6.2V138 or Kir6.1M148 in the H5-M2 link influence directly the diffusion of K+ ions; and (ii) structural constraints between Kir6.2S113 or Kir6. 1N123 in the M1-H5 link and Kir6.2R136 or Kir6.1R146 near the H5 region control the conformation of the permeation pathway. These mechanisms represent a novel and possibly general aspect of the control of ion channel permeability. PMID:10369672

Repunte, V P; Nakamura, H; Fujita, A; Horio, Y; Findlay, I; Pott, L; Kurachi, Y

1999-06-15

386

In and InSe doping influence on CdTe postmelting effect  

NASA Astrophysics Data System (ADS)

The influence of small In or InSe (up to 10 mol. %) additions to the CdTe melt on additional endothermic effects (AEE) positions in DTA thermograms was studied. It was observed, that both AEEs at 1392 K, typical for pure CdTe melt, and “own" at Tm+(9-10) K appear in CdTe+In melt heating curves during thermocycling. The melting of CdTe-InSe alloys occurs step-by-step without “own" postmelting effects. The solid CdTe dissociation enthalpy near Tm (? Hdiss=287± 22 kJ/mol) and the CdTe fusion enthalpy (? H_f=43.85± 1.15 kJ/mol) were estimated on the base of the obtained DTA data. L'influence de petites additions d'In ou d'InSe (jusqu'à 10 mol%) à du CdTe fondu sur les positions des effets endothermiques additionels (AEE) des thermogrammes d'analyse thermique différentielle (ATD) ont été étudiés. Nous avons observé, à la fois, que l'effet AEE à 1392± 1 K, typique du CdTe pure fondu et qu'un “novel" effet à la temperature de liquidus d'alliage CdTe+In ±(9-10) K sont reproduits dans les courbes de chauffage. La fusion des alliages CdTe-InSe s'effectue pas à pas sans effets de post-fusion particuliers. L'enthalpie de dissociation de CdTe solide près de Tm (? Hdiss=287± 22 kJ/mol) et l'enthalpie de fusion de CdTe (? H_f=43,85± 1,15 kJ/mol) ont été estimées à partir des donnes obtenues par ATD.

Shcherbak, L.; Feychuk, P.; Kopach, O.; Falenchuk, O.; Panchuk, O.

1998-07-01

387

Calculation of MRF influence functions  

NASA Astrophysics Data System (ADS)

Magnetorheological finishing (MRF) is a commonly used computer-controlled polishing (CCP) technique for high precision optical surfaces. The process is based on a magnetorheological abrasive fluid, which stiffens in a magnetic field and may be employed as a sub-aperture polishing tool. Dependent upon the surface error-profile of the workpiece and the polishing tool characteristic (influence function) an individual polishing procedure is calculated prior to processing. However, determination of the influence function remains a time consuming and laborious task. A user friendly and easy to use software tool has been developed, which enables rapid computation of MRF influence functions dependent on the MRF specific parameters, such as, magnetic field strength or fluid viscosity. The software supersedes the current cumbersome and time consuming determination procedure and thus results in considerably improved and more economical manufacture. In comparison with the conventional time period of typically 20 minutes to ascertain an influence function, it may now be calculated in a few seconds. An average quality improvement of 57% relating to the peak-valley (PV) value, and approximately 66% relating to the root-mean-square (RMS) of the surface error-profiles was observed during employment of the artificial computed influence functions for polishing.

Schinhaerl, Markus; Smith, Gordon; Geiss, Andreas; Smith, Lyndon; Rascher, Rolf; Sperber, Peter; Pitschke, Elmar; Stamp, Richard

2007-09-01

388

Douleurs et conflits : Approche comparative et implications pour la qualit? des soins en fin de vie  

PubMed Central

Le conflit serait-il à l’organisation ce que la douleur est à un organisme ? OBJECTIFS: Explorer les similitudes et les differences entre les douleurs et les conflits dans les contextes de soins de fin de vie. Mieux comprendre le rôle des conflits dans la qualité de ces soins. MÉTHODOLOGIE: Méthode comparative et réflexive autour des politiques de prise en charge des douleurs et des conflits dans les systèmes de soins. RÉSULTATS: Les conflits et les douleurs présentent de nombreuses similitudes de par leur identité, leur typologie, leur prévalence, leur fonction d’alerte, leurs coûts économiques et sociaux, le déni ou l’occultation qui les entourent et les obstacles à leur prise en charge adéquate. À l’inverse, des différences apparaissent dans la prise en charge des douleurs comparée à celle des conflits. Ces différences portent sur l’existence des programmes de prévention et de lutte sur les scènes nationale et internationale, la mise en œuvre des activités de recherche et de formation et la visibilité sociale. Pour les conflits, cette mise en œuvre n’existe pas encore. CONCLUSION: Les décideurs en clinique et en santé publique devraient intégrer les conflits comme un indicateur de la qualité des soins et élaborer des politiques pertinentes en matière de santé.

Mpinga, Emmanuel Kabengele; Verloo, Henk; Rapin, Charles-Henri; Chastonay, Philippe

2009-01-01

389

Remagnetization of Cretaceous forearc strata on Santa Margarita and Magdalena Islands, Baja California Sur: Implications for northward transport along the California margin  

NASA Astrophysics Data System (ADS)

Paleomagnetic data for two sections of Cretaceous forearc strata with different structural attitudes on Santa Margarita and Magdalena Islands in Baja California Sur, Mexico, indicate that these rocks have been remagnetized, probably during the late Cenozoic. The in situ paleomagnetic directions, however, are similar to data from other Cretaceous rocks on peninsular California with unexpectedly shallow inclinations and easterly declinations. These data have been interpreted as indicating either northward tectonic transport (10°-15° of latitude) and clockwise rotation (>20°) or compaction shallowing of magnetic inclinations in sedimentary rocks combined with southwestward tilting of plutonic rocks. The available paleomagnetic data for Cretaceous forearc strata in southern and Baja California can be divided into three groups: (1) sections with normal-polarity magnetizations that fail fold tests and are remagnetized, (2) sections with normal-polarity magnetizations with no or inconclusive fold tests that may or may not be remagnetized, and (3) sections with both normal-and reversed-polarity intervals where pervasive remagnetization has not occurred. Other rocks of the Mesozoic Great Valley Group, Coast Range ophiolite, and Franciscan Complex in California also have secondary magnetizations with directions similar to younger geomagnetic field directions. Although these widespread remagnetizations could have variable local causes, we propose regional burial and uplift, related to changes in subduction parameters, as a possible explanation. Two episodes of remagnetization are apparent: one in the Late Cretaceous and a second in the late Cenozoic. On the other hand, the unremagnetized and apparently reliable data from sedimentary and plutonic rocks on the Baja Peninsula consistently indicate northward translation (14° ± 3°) and clockwise rotation (29° ± 8°) with respect to North America since the Late Cretaceous.

Hagstrum, Jonathan T.; Sedlock, Richard L.

1998-12-01

390

Incidence of organochlorine pesticides and the health condition of nestling ospreys (Pandion haliaetus) at Laguna San Ignacio, a pristine area of Baja California Sur, Mexico.  

PubMed

We identified and quantified organochlorine (OC) pesticide residues in the plasma of 28 osprey (Pandion haliaetus) nestlings from a dense population in Laguna San Ignacio, a pristine area of Baja California Sur, Mexico, during the 2001 breeding season. Sixteen OC pesticides were identified and quantified. ?-, ?-, ?- and ?-hexachlorocyclohexane, heptaclor, heptachlor epoxide, endosulfan I and II, endosulfan-sulfate, p,p'-DDE, p,p'-DDD, aldrin, dieldrin, endrin, endrin aldehyde, and endrin ketone were the OCs found in the plasma of nestlings, ranging from 0.002 to 6.856 pg/?l (parts per billion). No differences were found in the concentration of pesticides between genders (P > 0.05). In our work, the concentrations detected in the plasma were lower than those reported to be a threat for the species and that affect the survival and reproduction of birds. The presence of OC pesticides in the remote Laguna San Ignacio osprey population is an indication of the ubiquitous nature of these contaminants. OCs are apparently able to travel long distances from their source to the study area. A significant relationship between hemoglobin and mean corpuscular hemoglobin concentrations and OC concentrations were found suggesting that a potential effect on the health of chicks may exist in this osprey population caused by the OC, e.g. anemia. The total proteins were positively correlated with ?-BHC, endosulfan I, and p,p'-DDD. It has been suggested that OC also affects competitive interactions and population status over the long term in vertebrate species, and our results could be used as reference information for comparison with other more exposed osprey populations. PMID:20949316

Rivera-Rodríguez, Laura B; Rodríguez-Estrella, Ricardo

2010-10-15

391

Elemental concentrations in different species of seaweeds from Loreto Bay, Baja California Sur, Mexico: implications for the geochemical control of metals in algal tissue.  

PubMed

Concentration levels of 21 elements were analyzed by instrumental neutron activation analysis (Rb, Cs, Ca, Sr, Ba, Sc, Cr, Fe, Co, Ni, Zn, Se, As, Sb, Th, U, Br, Hf, Ta, Zr, and Ag) in seven different seaweed species (Codium cuneatum, Sargassum sinicola, Padina durvillaei, Laurencia johnstonii, L. papillosa, Gracilaria pachidermatica and Hypnea pannosa), collected in a shallow coastal zone from Bahia de Loreto, Baja California Sur, Mexico. Measured concentrations in algal tissue spanned almost eight orders of magnitude (from 2.0 x 10(-3) microg g(-1) for Hf to 1.2 x 10(5) microg g(-1) for Ca). Ca was consistently the most abundant element in all analyzed seaweeds, followed by Fe and Sr. Brown algae showed a tendency to incorporate higher concentrations of elements than red and green algae. Additionally, there were significant linear correlations (P < 0.05 to P < 0.001) between a total of 76 different pairs of elements, some of them (e.g. Rb-Ni, Rb-Ag, Sc Cr, Sc-Fe, Sc Ni, Sc Hf, Cr Fe, Fe Ni, Fe-Hf and Ni-Th) highly correlated (r2 > 0.900). A significant correlation (r2 = 0.701, n = 18, P < 0.001) exists between our measurements in the tissue of algae and their corresponding average elemental concentrations in oceanic water from the North Pacific Ocean. Hence, overall elemental abundance in algal tissue apparently is controlled by the elemental abundance in oceanic water, whereas metabolic processes as well as environmental factors relevant to each region modify the final concentration of a given element in the body of a macroalgae. PMID:11504337

Sánchez-Rodríguez, I; Huerta-Diaz, M A; Choumiline, E; Holguín-Quiñones, O; Zertuche-González, J A

2001-01-01

392

La Purísima volcanic field, Baja California Sur (Mexico): Miocene to Quaternary volcanism related to subduction and opening of an asthenospheric window  

NASA Astrophysics Data System (ADS)

Geological mapping and geochemical analyses combined with 40K 40Ar ages for lavas from the Late Miocene to Quaternary La Purísima volcanic field (Baja California Sur) provide evidence for five volcanic events. These, in turn, may reflect plate interactions in the region. The oldest event (event 1), prior to 11 Ma, corresponds to the emission of normal to K-rich calc-alkaline lavas, exposed as large mesas in the eastern part of the studied area and as pyroclastic breccias and volcaniclastic sediments to the west. It is associated with the end of the Comondú arc activity resulting from subduction of the Farallon and Guadalupe plates. Between 10.6 and 8.8 Ma (event 2), magnesian andesites and tholeiites were emplaced. At 5.5 Ma (event 3) and 2.5 Ma (event 4) small volumes of magnesian andesites erupted in the central and southern parts of the volcanic field. Finally, between 1.2 Ma and Holocene (event 5), numerous basaltic and magnesian andesitic fissural and central emissions resulted in the formation of strombolian cones and associated lava flows, mainly distributed within a NNW SSE trending graben located SE of the town of La Purísima. Magmatic events 2 to 5 occurred well after the supposed end of the subduction event. Their geochemical characteristics are still typical of subduction-modified sources and possibly indicate partial melting of hot slab and formation of an asthenospheric window due to a slab rupture event which followed ridge trench collision, prior to the continental breakup of the Gulf of California extensional province.

Bellon, Hervé; Aguillón-Robles, Alfredo; Calmus, Thierry; Maury, René C.; Bourgois, Jacques; Cotten, Joseph

2006-04-01

393

Capillary electrophoresis finger print technique (CE-SSCP): an alternative tool for the monitoring activities of HAB species in Baja California Sur Costal.  

PubMed

In Mexican waters, there is no a formal and well-established monitoring program of harmful algal blooms (HAB) events. Until now, most of the work has been focused on the characterization of organisms present in certain communities. Therefore, the development of new techniques for the rapid detection of HAB species is necessary. Capillary electrophoresis finger print technique (CE-SSCP) is a fingerprinting technique based on the identification of different conformers dependent of its base composition. This technique, coupled with capillary electrophoresis, has been used to compare and identify different conformers. The aim of this study was to determine if CE-SSCP analysis of ribosomal RNA (rRNA) gene fragments could be used for a rapid identification of toxic and harmful HAB species to improve monitoring activities along the coasts of Baja California Sur, Mexico.Three different highly variable regions of the 18S and 28S rRNA genes were chosen and their suitability for the discrimination of different dinoflagellate species was assessed by CE-SSCP.The CE-SSCP results obtained for the LSU D7 fragment has demonstrated that this technique with this gene region could be useful for the identification of the ten dinoflagellates species of different genera.We have shown that this method can be used to discriminate species and the next step will be to apply it to natural samples to achieve our goal of molecular monitoring for toxic algae in Mexican waters. This strategy will offer an option to improve an early warning system of HAB events for coastal BCS, allowing the possible implementation of mitigation strategies. A monitoring program of HAB species using molecular methods will permit the analysis of several samples in a short period of time, without the pressure of counting with a taxonomic expert in phytoplankton taxonomy. PMID:22744160

Herrera-Sepúlveda, Angélica; Hernandez-Saavedra, Norma Y; Medlin, Linda K; West, Nyree

2012-06-29

394

Significance of the sulfonylurea receptor (SUR) as the target of diflubenzuron in chitin synthesis inhibition in Drosophila melanogaster and Blattella germanica.  

PubMed

Diflubenzuron (DIMILIN) is a powerful insecticidal chemical which has been known for many years to inhibit chitin synthesis in vivo in insects and related arthropod species. However, its action mechanism has remained unresolved partly because of its inaction on any of the enzymes involved in chitin synthesis in vitro. Based on our previous work (Diflubenzuron affects gamma-thioGTP stimulated Ca2+ transport in vitro in intracellular vesicles from the integument of the newly molted American cockroach, Periplaneta americana L. Insect Biochem. Mol. Biol. 24 (1994) 1009) showing that diflubenzuron inhibits Ca2+ uptake by vesicles obtained from the integument of American cockroach, Periplaneta americana (L.), in vitro, we tested the hypothesis that the action site of diflubenzuron is an ABC (ATP binding cassette) transporter, probably a sulfonylurea-sensitive transporter. Glibenclamide, one of the most commonly used sulfonylureas for type II diabetes treatment, was the positive control. When given to immature insects, glibenclamide clearly caused toxicity, with symptoms indicating molting abnormality comparable to diflubenzuron. Its LD50 (0.472 microg/nymph) was approximately 2.8 times the value obtained for diflubenzuron (0.17 microg/nymph, topical) in German cockroach, Blattella germanica (L.). However, in terms of the inhibitory activities on chitin synthesis, in isolated integuments glibenclamide showed an identical potency to diflubenzuron in B. germanica nymphs. A competitive binding assay with [3H]-glibenclamide and unlabeled diflubenzuron clearly established that the latter is capable of competitively displacing the former radioligand. The KD values observed for vesicles prepared from fruit fly larvae, Drosophila melanogaster M., were 44.9 nM for glibenclamide and 65.0 nM for diflubenzuron, respectively. Furthermore, glibenclamide was found to affect Ca2+ uptake by isolated cuticular vesicles from B. germanica in a manner very similar to diflubenzuron. These results support our conclusion that the sulfonylurea receptor (SUR) is the target of diflubenzuron in inhibition of chitin synthesis in these two insect species. PMID:15262279

Abo-Elghar, Gamal E; Fujiyoshi, Phillip; Matsumura, Fumio

2004-08-01

395

Greek influence on Babylonian astronomy?  

NASA Astrophysics Data System (ADS)

Astronomy in Babylonia during the first millennium BC developed out of a long tradition of observing and interpreting the sky into a science that was both observational and theoretical. It is well established that these developments influenced the practice of astronomy in neighbouring cultures in the Indus valley, Egypt and the Greco-Roman world. However, it is less clear whether there was any significant input from foreign cultures into the development of Babylonian astronomy. In this paper I examine the evidence for possible traces of Greek influence on Babylonian astronomy during the late first millennium BC. In particular, I discuss two possible cases of Greek influence that have been proposed in recent years: the naming of certain zodiacal signs and a value for the length of the year found on a Babylonian text that may be based upon Greek observations of summer solstices.

Steele, J. M.

396

The Influence of Presumed Media Influence on Strategic Voting  

Microsoft Academic Search

An increasingly influential line of research on media effects suggests that some of the effects of news media on society take place because people perceive media as influential. In this article, the authors test this notion, in the context of voting decisions. The authors propose that voters' perceptions regarding the influence of media will be related to their intention to

Jonathan Cohen; Yariv Tsfati

2009-01-01

397

Influencing the future of AGU  

NASA Astrophysics Data System (ADS)

Steve Jobs, visionary cofounder of Apple, Inc., once said, “Everyone here has the sense that right now is one of those moments when we are influencing the future.” This statement aptly describes AGU at this time as the Board of Directors and the Council continue to influence the future in exciting ways by advancing our strategic plan (http://www.agu.org/about/mission.shtml). Both governing bodies held meetings in San Francisco immediately preceding the 2011 AGU Fall Meeting. The agendas for both meetings, along with the key outcomes, are posted on AGU's Web site (http://www.agu.org/about/governance/).

McPhaden, Michael; Finn, Carol; McEntee, Chris

2012-01-01

398

La conception de la santé chez des garçons de 14 à 16 ans de milieu défavorisé  

Microsoft Academic Search

Dans le but de décrire leur conception de la santé, des entrevues individuelles ont été conduites auprès de 700 garçons de 14 à 16 ans de milieu défavorisé. Une analyse de contenu classique a été réalisée sur les verbalisations des jeunes et des taux d'accords interjuges ont été calculés. La capacité d'assumer ses activités de façon optimale, les habitudes de

SYLVIE JUTRAS; RICHARD E. TREMBLAY; PAULINE MORIN

1999-01-01

399

La transformation des universités en République tchèque : L'expérience de l'Université de Bohème occidentale de Pilsen  

Microsoft Academic Search

On décrit brièvement la situation des universités tchèques au début de la dernière décennie du XXe siècle en insistant sur certaines de leurs originalités. Le personnel académique a été confronté à des problèmes nouveaux au moment où sont intervenus des changements dans la société tchèque. La participation à plusieurs programmes internationaux et la possibilité de se procurer une information pertinente

Josef Rosenberg

2002-01-01

400

Calcul Matriciel Appliqué Aux Couches Minces élaboration des dérivées Partielles du Coefficient de Réflexion  

Microsoft Academic Search

Faute de pouvoir déterminer des tolérances de fabrication convenables, la réalisation de filtres optiques se heurte au problème de leur reproductibilité. Il ne peut être résolu que par la connaissance, a priori, des fluctuations sur les caractéristiques des revêtements qui sont provoquées par des variations d'épaisseur ou d'indice dans les différentes couches déposées. La détermination des dérivées partielles par rapport

Jacques Mouchart

1980-01-01

401

Facteurs pronostiques de survie après cancer: le modèle épidémiologique  

Microsoft Academic Search

Résumé L'étude de la survie des patients a pour principal objectif l'évaluation de la qualité de leur prise en charge. Lorsque le calcul se base sur les cas hospitalisés (survie clinique), il vise essentiellement à établir les effets de la thérapeutique, en général après prise en compte des caractéristiques diagnostiques de la lésion (stades, etc.). Lorsque la survie est calculée

Luc Raymond; Mirjana Obradovic; Gérald Fioretta

1988-01-01

402

Est-ce que l'enseignement superieur chez les jeunes femmes a considerablement reduit l'ecart entre les sexes en matiere d'emploi et de revenu?  

Microsoft Academic Search

Les jeunes femmes ont gagne enormement de terrain par rapport aux hommes du meme age en ce qui concerne le niveau de scolarite atteint dans les annees 1990. L'objectif de cette etude est d'evaluer le role que joue le niveau de scolarite, qui va rapidement en augmentant, des jeunes femmes quant a leur place relative sur le marche du travail.

Marc Coulombe Simon Frenette

2007-01-01

403

Influence des parametres de reextraction-cristallisation sur les proprietes physico-chimiques des cristaux d'AUC. (Effect of re-extraction crystallization parameters on physical and chemical properties of AUC).  

National Technical Information Service (NTIS)

This study is concerned with direct cristallization of ammonium uranyl carbonate (AUC) from a uranium loaded organic phase (30% TBP in kerosene), with ammonium carbonate (NH4)2 CO3. The effects of operating conditions (NH4)2 CO3 concentration, flowration ...

B. Yahi

1990-01-01

404

A planning algorithm to assess the impact of urban growth on flood expectancy \\/ Un algorithme de planification pour évaluer l'influence de l'accroissement urbain sur la probabilité des crues  

Microsoft Academic Search

Standard engineering and planning practice regarding flood hazard delineation in the United States is based on the assumption that 1 per cent annual flood expectancy is static and that subsequent urbanization of the basin will have no significant impact on that expectancy. Research during the past three years demonstrates that this assumption is unjustified in certain settings where the hydrological

MARK E. SMITH; DONALD O. DOEHRING

1978-01-01

405

Influence du Carbone sur la Cristallisation Primaire des Alliages U-Mo de Faibles Teneurs (Effect of Carbon on the Primary Crystallization of Low Content U-Mo Alloys).  

National Technical Information Service (NTIS)

The report gives the results concerning the effects of carbon on the primary crystallization of uranium-molybdenum alloys. In effect, low amounts of added carbon can lead to considerable refinement of the alpha grain. After describing in the first part th...

M. Colombie J. Decours

1966-01-01

406

Etude de l'electrocatalyse de la reduction de l'oxygene sur des alliages de palladium cuivre  

NASA Astrophysics Data System (ADS)

This thesis is on the development of the ORR on Pd-Cu alloys in acid medium. Density Functional Theory (DFT) was used to determine the intrinsic properties of the alloys. The alloys were fabricated by RF sputtering on glassy carbon support and chemical salt reduction on carbon support. They characterised by electrochemical methods and correlations were made between the intrinsic properties and the experimental electrochemical parameters. These correlations were used to explain the electrocatalytic performance of the ORR on these aklooys and to determine the mechanism of this reaction on these electrocatalysts. Accordingly the following aspects were studied in details. In the first step, ab initio investigations of the effect of the intermediate adsorption on the variation of the reversible potential of the ORR on Pt(100) was shown. Density Functional Theory (DFT) was used to determine the energies and the geometry parameters of the intermediates which can be adsorbed on Pt(100) during the oxygen reduction reaction (ORR) and their effect on the . The Comparison of these energies and parameters using the Bridge or the Griffiths sites adsorption mechanism suggests that the two paths are feasible. In both mechanisms, the total adsorption energies of the intermediates species continuously decrease. Moreover, according to the geometry analysis, the O-O bond distance in H2O2 is higher in both (Bridge and Griffiths) processes compared to the gas phase. Such a result suggests a dissociative H2O2 adsorption whatever the type of the involved mechanism involved. In the second step, the Oxygen reduction reaction (ORR) on palladium-copper alloys was studied through two approaches. The first one is based on the correlations between the surface chemical composition and the kinetics parameters of the ORR. The second approach is focused on the correlations between the adsorption energies of O2 and OH of Pd-Cu(111) surfaces and the electronic properties of the alloys. The adsorbtion energy calculations are based on on ab initio calculation using the program VASP (Vienna ab initio program) in a MeDeA environnement (software purchased from Materials Design, Inc. The studies of the oxygen reduction reaction were performed in an acidic media on Palladium-Copper alloys as catalyst. The variation of the intrinsic metal surface properties (lattice parameter, binding energy, work function (Wf), d-band filling and d-band center epsilond) and O2 and OH adsorption energies of on (111) Pd-Cu surface alloys were determined using ab initio program. Calculations of these parameters were based on plane waves approach on slab system with density functional theory (DFT) using the Vienna ab initio simulation program (VASP). It was shown that insertion of Cu atoms in Pd lattice affects geometric and electronic properties of Pd. These changes influence significantly O2 and OH adsorption. In the third step, the oxygen reduction reaction (ORR) on Pd-Cu catalyst has been studied in acidic media. The palladium alloys were prepared by RF magnetron using a palladium and a copper wafer as targets on the glassy carbon substrate. The dual sputtering we used allowed the deposition of about 1micrometer thin film of Pd-Cu on glassy carbon (GC). The ORR kinetics was studied on these catalysts in 0,1M HClO4. Cyclic voltammetry (CV) was used to determine the electrochemical active surface area (Sa). An increase in Sa with the Cu content in the alloy was observed for the alloys containing more than 50% in Cu. The Pd-Cu alloys containing more than 50% in Cu exhibits a constant value of 23 cm2 for Sa. It was further shown that the ORR on the Pd-Cu alloys proceeds through the 4 electrons transfer mechanism and a Tafel slope of 60 mV/dec. The Pd 50Cu50 exhibits the highest activity for this reaction. The enhancement of the electro catalytic activity is attributed to an optimal d band property that makes easier the OOH dissociative adsorption which is considered as chemical rate determining step (RDS) for the ORR. It was also found that all the Pd-Cu alloys exhibited better electr

Fouda-Onana, Frederic

407

Étude de l'effet d'un polyacrylate et d'un polyphosphate sur la morphologie et la minéralogie du sulfate de calcium  

NASA Astrophysics Data System (ADS)

The retarding influence of polyacrylate and polyphosphate on the nucleation of calcium sulphate was investigated. SEM analyses show that these inhibitors didn’t only influence the nucleation kinetics but also the precipitate morphology by adsorption onto crystal growth sites. The influence of different concentrations of the additives on the mineralogy of solid precipitated was also examined. Spectroscopy Raman analyses showed that the calcium sulphate can precipitate under different phases, gypsum (CaSO4.2H2O), hemihydrate (CaSO4.1/2H2O) and / or anhydride (CaSO4), as function of inhibitors concentrations.

Ben Ahmed, S.; Tlili, M. M.; Ben Amor, M.; Joiret, S.

2004-12-01

408

Phonological Awareness: Factors of Influence  

ERIC Educational Resources Information Center

|Early child development is influenced by various genetic and environmental factors. This study aims to identify factors that affect the phonological awareness of preschool and first grade children. Based on a sample of 330 German-speaking children (mean age = 6.2 years) the following domains were evaluated: Parent factors, birth and pregnancy,…

Frohlich, Linda Paulina; Petermann, Franz; Metz, Dorothee

2013-01-01

409

Young Children's Influence in Preschool  

ERIC Educational Resources Information Center

|The purpose of this study was to investigate how very young children can influence their daily life in preschool, in relation to teacher control. The specific questions studied were: What opportunities do the children have to make their own choices and take the initiative? How does teacher control manifest itself? What form do permanent…

Emilson, Anette

2007-01-01

410

Key influences on construction innovation  

Microsoft Academic Search

The goal of this paper is to identify the main factors driving or hindering construction innovation. An analysis of the relevant literature indicates there are six primary influences: (1) clients and manufacturers; (2) the structure of production; (3) relationships between individuals and firms within the industry and between the industry and external parties; (4) procurement systems; (5) regulations\\/standards; and (6)

A. M. Blayse; K. Manley

2004-01-01

411

Factors influencing solar energy commercialization  

Microsoft Academic Search

The prospects for solar energy commercialization in Arizona are examined. Topics considered include the relative demand potential for selected solar energy products, factors influencing current and future demand for solar energy products, and recommended business and government actions to accelerate commercialization. A Delphi process was used to collect survey data. Water heaters were identified as the solar energy products with

B. J. Walker

1978-01-01

412

Individual Influence on Model Selection  

ERIC Educational Resources Information Center

|Researchers in psychology are increasingly using model selection strategies to decide among competing models, rather than evaluating the fit of a given model in isolation. However, such interest in model selection outpaces an awareness that one or a few cases can have disproportionate impact on the model ranking. Though case influence on the fit…

Sterba, Sonya K.; Pek, Jolynn

2012-01-01

413

Ambient displays: influencing movement patterns  

Microsoft Academic Search

Ambient displays are gradually augmenting the principal static elements of architecture, such as walls, transforming space into a dynamic and ever-changing environment. Does the addition of such digital elements influence people's perception and understanding of space around them? If so, do ambient displays lead to behavioral changes like people's movement in such environments? In this particular study, a series of

Tasos Varoudis; Sheep Dalton; Katerina Alexiou; Theodore Zamenopoulos

2011-01-01

414

How Administrators Influence Student Learning.  

ERIC Educational Resources Information Center

|The decisions that administrators make touch every facet of the institutional experience and fundamentally affect teaching and learning. Research shows, however, that administrators do not always recognize their influence nor their responsibility for the quality of instruction. A study of one urban community college district revealed an…

Richardson, Richard C., Jr.

415

Factors Influencing College Science Success  

ERIC Educational Resources Information Center

|In this paper, the authors report some of the salient findings of a large-scale, four-year national study, conducted at the Harvard-Smithsonian Center for Astrophysics, entitled "Factors Influencing College Science Success" (FICSS), which surveyed college students who enrolled in first-year biology, chemistry, and physics courses throughout the…

Tai, Robert H.; Sadler, Philip M.; Mintzes, Joel J.

2006-01-01

416

College Factors That Influence Drinking  

Microsoft Academic Search

Objective: The purpose of this article is to examine the aspects of collegiate environments, rather than student characteristics, that influence drinking. Unfortunately, the existing literature is scant on this topic. Method: A literature review of articles primarily published within the last 10 years, along with some earlier \\

CHERYL A. PRESLEY; PHILIP W. MEILMAN; JAMI S. LEICHLITER

2002-01-01

417

The Pacific and its influence  

Microsoft Academic Search

A specially equipped scientific research ship and an Orion P-3 instrumented aircraft will be dispatched to the equatorial Pacific Ocean this spring by the National Oceanic and Atmospheric Administration (NOAA) to conduct in-tandem studies of the ocean's influence on, and relationship with, the atmosphere. The NOAA ship Researcher will cruise the waters from Honolulu to Tahiti between May 14 and

null Anonymoua

1984-01-01

418

The factors influencing childrens’ drawings  

Microsoft Academic Search

Drawings are an important part of child's life. Children can describe their happiness, unhappiness, future dreams, past lives and continuing lives as they want through their drawings. The factors influencing children's drawings can be grouped under two main categories. They are; (1) the factors which are specific to child (species-specific readiness, maturation, age, intelligence, motivation, general state of arousal and

Vuslat O?uz

2010-01-01

419

Factors Influencing College Science Success  

ERIC Educational Resources Information Center

In this paper, the authors report some of the salient findings of a large-scale, four-year national study, conducted at the Harvard-Smithsonian Center for Astrophysics, entitled "Factors Influencing College Science Success" (FICSS), which surveyed college students who enrolled in first-year biology, chemistry, and physics courses throughout the…

Tai, Robert H.; Sadler, Philip M.; Mintzes, Joel J.

2006-01-01

420

Surface Organization Influences Bistable Vision  

ERIC Educational Resources Information Center

|A priority for the visual system is to construct 3-dimensional surfaces from visual primitives. Information is combined across individual cues to form a robust representation of the external world. Here, it is shown that surface completion relying on multiple visual cues influences relative dominance during binocular rivalry. The shape of a…

Graf, Erich W.; Adams, Wendy J.

2008-01-01

421

Future Influences on Management Education.  

ERIC Educational Resources Information Center

The developments and issues in the future of management education, as defined and discussed by a panel supported by the Graduate Management Admission Council, are outlined and discussed briefly. The information is taken from a larger report entitled "Future Influences on Management Education." (MSE)

Nanus, Burt

1984-01-01

422

Nutritional Influences on Biofilm Development  

Microsoft Academic Search

The amounts and types of nutrients in the environment influence the development and final bacterial and chemical composition of biofilms. In oligotrophic environments, organisms respond to nutrient stress by alterations in their cell morphology and cell surfaces, which enhance adherence. Little is known of the responses to stress by bacteria in the animal oral cavity. The environment in the oral

G. H. W. Bowden; Y. H. Li

1997-01-01

423

MAN'S INFLUENCE ON LAKE ERIE  

Microsoft Academic Search

Conversion of northwestern Ohio's Great Black Swamp to farm land during the last half of the nineteenth century had a profound, but scantily documented influence on Lake Erie. Silts, once largely filtered out by the swampland vegetation, were, with the de- struction of that vegetation, carried into Lake Erie, where their effect in reducing light penetration has significantly altered the

JACOB VERDUIN

424

Does Study Design Influence Outcome?  

Microsoft Academic Search

Background: Clinicians and researchers synthesize data from randomized controlled trials (RCTs) of antidepressants to make conclusions about the efficacy of medications for depression. All treatments include nonspecific factors in addition to the specific effects of drugs, and study design may influence patient outcomes via nonspecific factors. This study investigated whether placebo control and treatment duration affect the outcome in antidepressant

Bret R. Rutherford; Joel R. Sneed; Steven P. Roose

2009-01-01

425

INFLUENCE OF HORMONES ON LIVER  

PubMed Central

Modification of the endocrine milieu intérieur by administration or withdrawal of hormones considerably influenced the concentration in liver of lactic dehydrogenase, glucose-6-phosphate dehydrogenase, and 6-phosphogluconic dehydrogenase. Hormones effective in this regard are thyroxine, estradiol-17?, dihydrotestosterone, and 3?-hydroxysteroids in the androstane series. These hormonal effects are both organ-selective and, in liver, enzyme-selective. Thyroxine and steroids are not equivalent in their influence on the 3 hepatic dehydrogenases. Thyroxine was preeminent in this regard among hormones investigated in the present experiments. Each of the pyridine nucleotide-linked dehydrogenases in liver had an individually characteristic response to the administration of various hormones which was reflected in its hepatic level. The concentration in liver of lactic dehydrogenase was profoundly raised or lowered, respectively, by the administration of thyroxine or by thyroidectomy, and injection of steroids had small influence on its level. The levels of glucose-6-phosphate dehydrogenase and of 6-phosphogluconic dehydrogenase were considerably influenced by injection of thyroxine, estradiol-17?, or testosterone. Sex steroids did not increase the levels of these enzymes in hypophysectomized or thyroidectomized rats unless thyroxine was administered concurrently. Under designated conditions, it was found that the concentration of 6-phosphogluconic dehydrogenase was increased by hormonal methods which did not elevate the concentration of glucose-6-phosphate dehydrogenase. But high levels of glucose-6-phosphate dehydrogenase were not achieved without a considerable elevation of 6-phosphogluconic dehydrogenase as well.

Huggins, Charles; Yao, Fung-O

1959-01-01

426

Strategies to influence PVR development.  

PubMed

Proliferative vitreo-retinopathy (PVR) is a complication of rhegmatogenous retinal detachment or severe ocular trauma (intraocular foreign body, penetration, perforation, contusion, rupture). The risk of PVR varies from 10 to 40% depending on the original disease. Strategies to influence the risk of PVR include surgical techniques, pharmacological adjuncts, and preventive measurements. Surgical influences on the risk of PVR comprise: surgical skills (buckling, atraumatic procedure), primary vitrectomy, early vitrectomy, retinectomy, choice of vitreous tamponade agent. The influence of most such parameters is not confirmed by prospective randomized studies. Pharmaceutical adjuncts include daunomycin, 5-fluoruracil plus heparin and others. The influence of most such parameters has been studied by prospective randomized studies. The effect is statistically significant, its clinical relevance is subject of current discussion. Prevention of PVR, via prevention of injury, was successful in the past as shown by the reduction of wind screen injuries after the seatbelt legislation was installed, and reduction of work related injuries from protective eyewear. As for the treatment of existent PVR despite some progress in the past, there should be better ways of treatment ahead of us. PMID:15309556

Kirchhof, Bernd

2004-08-10

427

Sociocultural influences on eating disorders  

Microsoft Academic Search

Objectives of review. This chapter reviews articles published in 2005 and 2006 on the influence of culture, ethnicity and gender on eating disorders. Specific social environmental factors, including media portrayals of body ideals and peer and family environment, are also reviewed. Summary of recent findings. Certain non-Western values may increase the risk of eating disorders. Ethnicity and gender may moderate

Pamela K Keel; Julie A Gravener

428

Sex and hemisphere-related influences on the neurobiology of emotionally influenced memory  

Microsoft Academic Search

Recent findings are beginning to reveal apparently pronounced influences of both sex and cerebral hemisphere on the neurobiology of emotionally influenced memory. In this article, I first provide a brief, general overview of sex-related influences on brain and cognition. I next describe recent findings from my laboratory and others demonstrating sex-related influences on neural mechanisms underlying emotionally influenced explicit recall

Larry Cahill

2003-01-01

429

Manual on the Flight of Flexible Aircraft in Turbulence (Manuel sur le Vol des Avions Non-rigides en Milieu Turbulent).  

National Technical Information Service (NTIS)

The study of atmospheric turbulence and its influence on aircraft operation and design has been of concern almost continuously since the inception of AGARD. The past few years have seen a heightened interest in the turbulence or gust problem, particularly...

J. C. Houbolt

1991-01-01

430

Research is a Verb: Exploring a New Information Literacy-Embedded Undergraduate Research Methods Course \\/ Chercher est un verbe: exploration d'une nouvelle forme de maîtrise de l'information - le cours sur les méthodes de recherche intégrées au premier cycle  

Microsoft Academic Search

RésuméRésumé Cet article propose une solution potentielle à l'inquiétude générale et de longue date concernant la faculté des étudiants de premier cycle à chercher, écrire et exercer une pensée critique: il s'agit d'un cours sur les méthodes de recherche basé sur l'activité et spécifique à la discipline. L'article explore en détail la conception du cours et montre son efficacité par

Shauna Wilton; Sarah Polkinghorne

2010-01-01

431

Research is a Verb: Exploring a New Information Literacy-Embedded Undergraduate Research Methods Course \\/ Chercher est un verbe: exploration d'une nouvelle forme de maîtrise de l'information - le cours sur les méthodes de recherche intégrées au premier cycle  

Microsoft Academic Search

Résumé:Cet article propose une solution potentielle à l'inquiétude générale et de longue date concernant la faculté des étudiants de premier cycle à chercher, écrire et exercer une pensée critique: il s'agit d'un cours sur les méthodes de recherche basé sur l'activité et spécifique à la discipline. L'article explore en détail la conception du cours et montre son efficacité par l'examen

Shauna Wilton; Sarah Polkinghorne

2010-01-01

432

San José Island Accommodation Zone, Baja California Sur, Mexico: A Key to Onshore-Offshore Fault Relationships along the Western Margin of the Southern Gulf of California  

NASA Astrophysics Data System (ADS)

The two-stage evolution of the southern Gulf of California included protogulf orthogonal rifting from ˜12 to ˜6 Ma, followed by overprinting from ˜6 to 0 Ma by the highly oblique-divergent, modern plate boundary. The San José Island accommodation zone, located ˜70 km north-northwest of La Paz, Baja California Sur, represents the transition between strike-slip partitioning to the south and the oblique-divergent structural overprinting to the north. The accommodation zone includes San José and San Francisquito islands, the San José Canal, and a 4 to 6 km wide belt along the coast of the Baja California peninsula. The accommodation zone separates the La Paz rift segment to the south from the Timbabichi rift segment to the north. The El Carrizal fault bounds the La Paz rift segment, and likely splays onshore in the southernmost accommodation zone. Kinematic data, fault mapping, and geomorphologic and bathymetric observations along the shoreline suggest the presence of en echelon, offshore faults in the San José Canal between the Baja peninsula and islands. The main faults in the southern San José Canal appear to be a series of right-stepping, east-dipping normal faults branching northward from the El Carrizal fault. Based on onshore fault trends in the northern accommodation zone, the northern Canal faults form a left-stepping link to the main bounding fault of the Timbabichi rift segment. The faults bounding the western edge of the islands are likely left-stepping, west-dipping normal faults. Steep, triangular facets and cliffs characterize the western edge of San José Island and suggest that the western island-bounding faults are active. The Pliocene basin, basin-bounding fault, and line of steep coastal cliffs on the eastern side of San José Island are likely associated with the northern end of the Espíritu Santo normal fault, which experienced a major earthquake in 1995. The basin and faults also may be the termination of a series of faults related to the fracture zone emanating from the Alarcón spreading ridge. A similar relationship between basin and accommodation zone development and the evolution of strike-slip/fracture zone systems has been demonstrated in other rifts. Formation of San José and San Francisquito islands along normal faults may be a result of (1) the latest Miocene-early Pliocene tectonic reorganization to oblique rifting, and (2) active normal faulting in the San José Island accommodation zone and southward.

Drake, W. R.; Umhoefer, P. J.

2003-12-01

433

Investigating Factors that Influence Climate  

NSDL National Science Digital Library

There are several factors that influence the climate or prevailing weather conditions for any given location on Earth. The most important factor is the latitude of the location because that affects the amount of solar radiation received throughout the year. Other factors include its distance from a body of water (its moisture source), elevation and local topography. In this 6 to 10 day unit plan, students will employ inquiry methods to investigate how latitude and longitude (and distance from oceans) impact climatic factors such as temperature range, average temperature, and precipitation. They will create climatic diagrams called climatograms that allow them to display monthly average weather conditions such as temperature and precipitation at a particular location. They will then use the data to design an investigation about the factors that influence climate.

434

Influence of confinement on thermodiffusion  

NASA Astrophysics Data System (ADS)

This work focuses on a possible influence of a nanoporous medium on the thermodiffusion of a fluid ``isotopic'' mixture. To do so, we performed molecular dynamics simulations of confined Lennard-Jones binary equimolar mixtures using grand-canonical like and non-equilibrium approaches in sub- and super-critical conditions. The study was conducted in atomistic slit pore of three adsorbent natures for various widths (from 5 to 35 times the size of a molecule). The simulation results indicate that for all thermodynamic conditions and whatever the pore characteristics, the confinement has a negligible effect on the thermal diffusion factor/Soret coefficient. However, when considered separately, the mass diffusion and thermodiffusion coefficients have been found to be largely influenced by the pore characteristics. These two coefficients decrease noticeably when adsorption is stronger and pore width smaller, a behavior that is consistent with a simple hydrodynamic explanation.

Hannaoui, Rachid; Galliero, Guillaume; Hoang, Hai; Boned, Christian

2013-09-01

435

Influence of confinement on thermodiffusion.  

PubMed

This work focuses on a possible influence of a nanoporous medium on the thermodiffusion of a fluid "isotopic" mixture. To do so, we performed molecular dynamics simulations of confined Lennard-Jones binary equimolar mixtures using grand-canonical like and non-equilibrium approaches in sub- and super-critical conditions. The study was conducted in atomistic slit pore of three adsorbent natures for various widths (from 5 to 35 times the size of a molecule). The simulation results indicate that for all thermodynamic conditions and whatever the pore characteristics, the confinement has a negligible effect on the thermal diffusion factor?Soret coefficient. However, when considered separately, the mass diffusion and thermodiffusion coefficients have been found to be largely influenced by the pore characteristics. These two coefficients decrease noticeably when adsorption is stronger and pore width smaller, a behavior that is consistent with a simple hydrodynamic explanation. PMID:24070302

Hannaoui, Rachid; Galliero, Guillaume; Hoang, Hai; Boned, Christian

2013-09-21

436

Collective Effects Influencing Fluorescence Emission  

Microsoft Academic Search

\\u000a \\u000a Abstract  Dramatic improvement of fluorescence sensing technologies can be achieved by combining molecular emitters into clusters, nanoparticles,\\u000a and aggregates. This chapter addresses the new effects that appear on incorporation of dyes into these supramolecular structures.\\u000a We consider different types of intermolecular interactions that influence the emission spectra, focusing on spectral changes\\u000a that are observed on concentrating organic dyes in confined media.

Alexander P. Demchenko

437

Influencing patients' oral hygiene behaviour  

Microsoft Academic Search

DesignA patient-randomised controlled trial (RCT) and a cluster RCT of the same intervention were conducted independently of each other.InterventionThe evidence-based intervention (a powered toothbrush and behavioural advice on timing, method and duration of toothbrushing) was framed to target oral hygiene self-efficacy (Social Cognitive Theory) and action plans (Implementation Intention Theory) to influence oral hygiene behaviour and therefore clinical outcomes. The

Andy Blinkhorn

2010-01-01

438

Mechanisms of Microbially Influenced Corrosion  

Microsoft Academic Search

The chapter demonstrates that biofilms can influence the corrosion of metals (1) by consuming oxygen, the cathodic reactant;\\u000a (2) by increasing the mass transport of the corrosion reactants and products, therefore changing the kinetics of the corrosion\\u000a process; (3) by generating corrosive substances; and (4) by generating substances that serve as auxiliary cathodic reactants.\\u000a These interactions do not exhaust the

Z. Lewandowski; H. Beyenal

439

Family Influences on Adolescent Development  

Microsoft Academic Search

The topic “family influences on adolescent development” often has conjured up popular images in western societies of emotional\\u000a turmoil, conflict, and rebellion by the young in reference to their parents. Fueled by dated theories and media stereotypes,\\u000a parent-adolescent turmoil was supposed to be a normal occurrence triggered, in part, by raging hormones, dramatic physiological\\u000a changes, re-emerging sexual impulses, and rapidly

Gary W. Peterson

440

Factors Influencing Wind Energy Curtailment  

Microsoft Academic Search

Nonphysically firm wind generation connections (i.e., those to which curtailment can apply) may be necessary for signifi- cant wind integration to congested transmission networks. A study of factors influencing this associated wind energy curtailment is, therefore,oftimelyimportance.Inthispaper,thewindcurtailment estimation effects of natural inter-yearly wind profile variability, systemdemand-profile\\/fuel-priceparameteruncertainty,andmin- imum system inertial constraints are studied in detail. Results in- dicate that curtailment estimation error

Daniel J. Burke; Mark J. O'Malley

2011-01-01

441

Informational Influences on Physician Referrals  

Microsoft Academic Search

Today's health care marketers are devoting significant resources to increase physician referrals, an area vital to their continued survival. The goal of this investigation was to integrate the findings of previous research on physician referrals, and to provide an up-to-date assessment of those influences underlying physician referral behavior. A questionnaire was mailed to 1,800 physicians differing in specially and years

Richard R Beltramini; Ajay K. Sirsi

1992-01-01

442

Calculation of MRF influence functions  

Microsoft Academic Search

Magnetorheological finishing (MRF) is a commonly used computer-controlled polishing (CCP) technique for high precision optical surfaces. The process is based on a magnetorheological abrasive fluid, which stiffens in a magnetic field and may be employed as a sub-aperture polishing tool. Dependent upon the surface error-profile of the workpiece and the polishing tool characteristic (influence function) an individual polishing procedure is

Markus Schinhaerl; Gordon Smith; Andreas Geiss; Lyndon Smith; Rolf Rascher; Peter Sperber; Elmar Pitschke; Richard Stamp

2007-01-01

443

Influence of Stresses on Precipitation  

Microsoft Academic Search

Precipitation, which usually occurs by nucleation, growth and coarsening, may be affected by elastic stresses which influence the thermodynan~ics of the system and thereby the driving force for precipitation. Such stresses may be internal, e.g. coherency stresses, or external, i.e. externally applied stresses. The consequences for nucleation, growth and coarsening are discussed in detail with special emphasis on the kinetics

G. Sauthoff

1996-01-01

444

Interest Group Behavior and Influence  

Microsoft Academic Search

During the last two decades economics has witnessed a remarkable upsurge in theoretical as well as empirical studies of the\\u000a behavior and of the political influence of interest groups. Recent books by Sloof (1998), Drazen (2000), Persson and Tabellini\\u000a (2000), and Grossman and Helpman (2001) refer to a wealth of evidence of the significance of organized interests in the political

Frans A. A. M. van Winden

445

Factors Influencing Online Social Interactions  

Microsoft Academic Search

\\u000a Popular discourse provides glimpses of the relationship between social motives and user experience. In this paper, factors\\u000a influencing social interactions with seven popular social networking sites are studied in the Indian context. Relatively a\\u000a novel method of focused unstructured interview technique with adaptation from triadic sorting is used to unearth the motivation\\u000a and behavior of the user. It indicates subtle

Ravi Shankar

446

Dommages Aux Meubles Canadiens Pendant Leur Transport (Damages on Canadian Furniture during Transportation) (A Temporary Inquiry).  

National Technical Information Service (NTIS)

The authors explain the problems concerning the packing of furniture and its transportation. The causes of damage are often due to poor packing and wrapping and poor supervising at the factory of origin and also to poor methods of loading and unloading. I...

C. H. Nethercote C. N. Boisvenu

1979-01-01

447

Authentification des personnes par leur voix : un nécessaire devoir de précaution  

Microsoft Academic Search

Because of recent events and as members of the scientific community working in the field of speech processing, we feel compelled to publicize our views concerning the possibility of identifying or authenticating a person from his or her voice. The need for a clear and common message was indeed shown by the diversity of information that has been circulating on

Jean-François Bonastre; Frédéric Bimbot; Louis-Jean Boë; Joseph P. Campbell; Douglas A. Reynolds; Ivan Magrin-Chagnolleau

2003-01-01

448

Réhabilitation des centres urbains historiques : leur apport pour le développement local  

Microsoft Academic Search

Toute opération de réhabilitation d'un centre urbain historique ne peut être défendue, quel que soit l'intérêt historique de ce dernier, que si les ressources rares qui lui sont consacrées et, par conséquent non affectées à d'autres projets, permettent d'atteindre, simultanément et grâce à cette opération, des objectifs prioritaires de développement pour le territoire considéré. Ceci suppose de préciser les limites

Michel Vernières

2005-01-01

449