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Sample records for bassin du lac

  1. PRODUCTION HALIEUTIQUE DU LAC FAE (BASSIN DU SAN ...

    African Journals Online (AJOL)

    about 5.229 millions CFA for the shrimp production at the rate of 1500 Flkg. .... Figure 1 Lac Fae-Localisation geographique, zones de production, secteurs et ... embankment dam ; d : water intake for regulating the threshold level of water in the.

  2. modelisation du comportement hydrologique du bassin versant

    African Journals Online (AJOL)

    LGE

    gestion optimale de l‟eau sur un bassin versant. ..... paramètres sont vérifiés sur la (s) période (s) de contrôle afin de s‟assurer ... critère est très utilisé en hydrologie pour évaluer les performances des modèles pluie-débit. ..... Dans un second temps, il peut d‟agir de la procédure de mesure des débits qui est basée sur la.

  3. Bassins versants du Loup, de la Cagne et du Malvan

    OpenAIRE

    Lepère, Cédric; Lautier, Laurence; Pellegrino, Emmanuel

    2013-01-01

    Identifiant de l'opération archéologique : 8453 Date de l'opération : 2007 (PC) ; 2007 (PI) Inventeur(s) : Lepère Cédric (AUT) ; Lautier Laurence (AUT) ; Pellegrino Emmanuel (AUT) Une campagne de prospection inventaire a été effectuée pendant trois mois, dans les bassins-versants de la Cagne, du Loup et du Malvan qui regroupent les communes de Cagnes-sur-Mer, Villeneuve-Loubet, La Colle-sur-Loup, Saint-Paul-de-Vence, Vence, Saint-Jeannet, Bezaudun, Tourrettes-sur-Loup, Roquefort-les-Pins, Le ...

  4. 35 Typologie des eaux de surface du bassin du Sebou par multi ...

    African Journals Online (AJOL)

    PR BOKO

    2Service de protection de la qualité de l'eau, Agence du Bassin Hydraulique du ... pour montrer l'évolution de la qualité biologique des eaux de surface du ..... Biological Indicators of Freshwater Pollution and Environmental Management,.

  5. Les effets du changement climatique dans le bassin du Congo : la ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    22 avr. 2016 ... Dans le bassin du fleuve Congo, plus de 80 % des habitants vivent exclusivement de l'agriculture, de la pêche, de l'élevage et de la cueillette, qui sont des activités largement tributaires du climat.

  6. Ecologie du phytoplancton du lac Kivu

    Directory of Open Access Journals (Sweden)

    Sarmento, H.

    2008-01-01

    Full Text Available Speciation within the African Coffee Pathogen. Cet article analyse s'il est avantageux d'utiliser le compost au lieu de l'engrais minéral pour produire la laitue dans la zone urbaine et péri-urbaine de Yaoundé. Les résultats de terrain montrent l'obtention de rendements et profits plus élevés lorsqu'on utilise le compost. Les résultats de la fonction de production Cobb-Douglas prouvent que l'utilisation du compost est statistiquement significative pour expliquer la variation de rendement de la laitue et que le compost est l'intrant le plus productif. D'autres résultats montrent que le compost fournit la matière organique utile au sol et que les besoins d'irrigation en eau de la culture sont réduits grâce à l'utilisation du compost. Par conséquent, malgré le fait que l'application du compost demande une main-d'oeuvre beaucoup plus élevée, son utilisation est généralement bénéfique pour les agriculteurs vivant aux alentours de Yaoundé. Les programmes de vulgarisation de cet intrant pour encourager son adoption devraient donc figurer parmi les points prioritaires dans la politique agricole du gouvernement camerounais.

  7. Focus : Le bassin versant expérimental du Moulin à Draix

    Directory of Open Access Journals (Sweden)

    LIÉBAULT, Frédéric

    2010-09-01

    Full Text Available Les petits bassins versants de montagne connaissent des crues soudaines et dévastatrices. Une des caractéristiques essentielles y est l’importance du transport de sédiments. Focus sur le bassin versant expérimental du Moulin à Draix dédié à l'étude de l'érosion et des crues rapides en montagne.

  8. Étude de la qualité des eaux usées des deux retenues du bassin du ...

    African Journals Online (AJOL)

    SARAH

    31 mai 2017 ... Gourou au carrefour de l'Indénié à Abidjan en 2012. 11138. Journal of Applied .... retenues sont nées du projet de gestion intégrée du bassin du Gourou (CI-FAD, ..... Contrôle de la qualité microbiologique des eaux usées ...

  9. RTE takes over Houilleres du Bassin de Lorraine's high voltage electricity network; RTE reprend le reseau electrique haute tension des Houilleres du Bassin de Lorraine

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2003-12-01

    Houilleres du Bassin de Lorraine (HBL) decided to sell their high voltage electricity network to RTE. This takeover by RTE, the French transmission system operator, corresponds to the public service mission entrusted to it by the law of February 10, 2000, concerning the rational distribution of an electricity service in France and the local servicing of customers through the public transmission system.

  10. Caractérisation des sables et morphologie du fond du lac du ...

    African Journals Online (AJOL)

    Une analyse sédimentologique et minéralogique réalisée sur un cycle hydrologique entre octobre 2004 et août 2005 a permis d\\'évaluer les charges solides en suspension et de caractériser les sédiments du lac du barrage de Taabo. La concentration moyenne en matières en suspension (12 mg.L-1) et la turbidité ...

  11. Caractérisation des sables et morphologie du fond du lac du ...

    African Journals Online (AJOL)

    Administrateur

    Une analyse sédimentologique et minéralogique réalisée sur un cycle hydrologique entre octobre 2004 et août 2005 a permis d'évaluer les charges solides en suspension et de caractériser les sédiments du lac du barrage de Taabo. La concentration moyenne en matières en suspension (12 mg.L-1) et la turbidité ...

  12. Amélioration de la gouvernance du secteur piscicole dans le bassin ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    depuis l'introduction du paiche (Arapaima gigas). La deuxième se trouvait dans le sud-est du bassin, où l'on fait l'élevage d'espèces indigènes comme le tambaqui. (Piaractus brachypomus). Premières incidences. Émergence de leaders locaux par recherche-action. L'un des principaux résultats fut de réunir les pêcheurs.

  13. Réponse équilibrée aux besoins en eau dans le bassin du Saïss au ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    ACCA

    par les changements climatiques. Ce projet du programme ACCA met l'accent sur l'agriculture, à l'origine de plus de 82 % de la consommation d'eau dans le bassin. Réponse équilibrée aux besoins en eaudans le bassin du Saïss au Maroc. De petits exploitants agricoles du bassin du Saïss font face aux pénuries d'eau ...

  14. 76 FR 68124 - Television Broadcasting Services; Fond du Lac, WI

    Science.gov (United States)

    2011-11-03

    ... FEDERAL COMMUNICATIONS COMMISSION 47 CFR Part 73 [MB Docket No. 09-115, RM-11543; DA 11-1502] Television Broadcasting Services; Fond du Lac, WI AGENCY: Federal Communications Commission. ACTION: Proposed rule. SUMMARY: In this document, the Commission denies a petition for reconsideration of an August 12...

  15. Du Lac de Geneve au Lac Baikal: deux metropoles en construction

    Directory of Open Access Journals (Sweden)

    Guy Mettan

    2006-08-01

    'Annemasse dans un ensemble qui atteindrait environ un million d'habitants au total. Le lac Leman (Lac de Geneve faisant office de point commun entre ces villes, la region prendrait le nom de metropole lemanique ou de Bassin lemanique. Ce qui a pour avantage de ne pas mettre Geneve trop en evidence et de ne pas vexer les autres villes dont les noms seraient menaces de disparaitre au profit de Geneve.Pour reussir, ce rapprochement doit respecter quelques principes fondamentaux :1 developper les infrastructures communes et les moyens de communication entre les villes partenaires : la gestion de l''aeroport international de Geneve a ainsi ete ouvert a la France et aux representants de Lausanne. On projette de construire une troisieme voie pour l'autoroute et la ligne de chemin de fer qui relie Geneve a Lausanne. Sur le plan politique, les deputes des deux provin2ces militent dans la meme direction.2 respecter les identites traditionnelles et developper une identite commune autour d'un projet rassembleur. Le projet de fusion a echoue parce qu'il niait l'histoire et les traditions propres a chaque ville. Sans territoire et de tradition protestante calviniste, Geneve est universitaire, internationale, tres urbaine. Lausanne est lutherienne et plus enracinee dans une region agricole et viticole. La culture et l'economie, et surtout la fiscalite ne sont pas les memes. Cela reconnu, il convient malgre tout de developper des projets communs, qui rassemblent les habitants des deux regions et puissent peu a peu forger l'idee d'un destin commun. Pour Geneve et Lausanne, ce pourrait etre la vocation internationale, Geneve etant connue pour ses organisations internationales liees et le siege europeen de l'ONU tandis que Lausanne est devenue la capitale internationale du sport avec le CIO (Comite international olympique et federations sportives. Un deuxieme axe est de profiler l'ensemble de la metropole comme une region du savoir, avec ses universites, ses sieges d'entreprises multinationales et

  16. Analyses de la dégradation du lac Kinkony pour la conservation du ...

    African Journals Online (AJOL)

    Le lac Kinkony fait partie des habitats clefs pour la biodiversité du Complexe des ... provide favoured habitat for numerous endemic and endangered avian, fish ... on fauna is essential for developing regional conservation and natural resource ...

  17. A geological survey of the Lac du Bonnet batholith, Manitoba

    International Nuclear Information System (INIS)

    McCrank, G.F.D.

    1985-02-01

    This report presents the results of a geological survey of the Lac du Bonnet batholith in Manitoba. The survey consisted of field mapping of the lithologies and the joint systems throughout the batholith, and the examination of lineaments identified on aerial photographs and Landsat imagery. Petrographic descriptions and a map of the lithologies, an analysis of the fracture systems and a lineament map are presented. The results of various regional geophysical surveys were used as an aid to the interpretation of the batholith's contacts and in the interpretation of lineaments as possible faults. A comparison of the Lac du Bonnet Batholith with the Eye-Dashwa Lakes Pluton near Atikokan, Ontario is also presented

  18. A geological reconnaissance study of the Lac du Bonnet batholith

    International Nuclear Information System (INIS)

    Tammemagi, H.Y.; Kerford, P.S.; Requeima, J.C.; Temple, C.A.

    1980-02-01

    A geological reconnaissance survey was carried out of the Lac du Bonnet batholith, southeastern Manitoba, as part of the concept verification phase of the nuclear fuel waste disposal program for Canada. This report summarizes available geological information, presents the results of field mapping and discusses the geochemical analyses of rock samples. The geological and structural aspects of the batholith are described as well as its regional setting and possible genesis. (auth)

  19. Distribution Du Zooplancton Le Long De Deux Petits Bassins ...

    African Journals Online (AJOL)

    Des peuplements zooplanctoniques ont été étudiés le long de deux petits bassins côtiers ivoiriens. Ce sont la rivière Bia, sur laquelle ont été construits les barrages hydroélectriques d\\'Ayamé I et II, et la rivière Agnébi dépourvue de barrage sur son cours principal. Le long de la rivière Bia, d\\'importantes variations de la ...

  20. Effet des conditions climatiques sur le niveau du lac Sidi Ali (Moyen Atlas, Maroc

    Directory of Open Access Journals (Sweden)

    Claude Martin

    2011-11-01

    Full Text Available Le lac Sidi Ali est un lac naturel d'altitude (2070-2080 m, sans exutoire superficiel, déterminé par le barrage d'une coulée basaltique. Doté d'un bassin versant apparent de 15,6 km2, il est alimenté par des eaux de ruissellement et par des sources karstiques. Son niveau subit des variations très fortes, annuelles et interannuelles, sous le contrôle des conditions climatiques, et en particulier des pluies et de l'évapotranspiration. Les périodes de sécheresse qui ont marqué les trois dernières décennies, se sont traduites par un abaissement du niveau de près de 7 m. Mais les précipitations abondantes des années 2008-09 et 2009-10 ont provoqué une nette remontée. Une régression multiple d'assez bonne qualité (r = 0,87 lie la variation annuelle du niveau (d'août à août à différents paramètres (conditions climatiques et niveau initial du lac.Lake Sidi Ali is a natural lake at high altitude (2070-2080 m, without surface outlet, determined by the dam of a basalt flow. With an apparent catchment of 15.6 km2, it is fed by runoff and karst springs. Its level shows strong annual and interannual variations, depending on weather conditions, particularly rainfall and evapotranspiration. Droughts that have marked the last three decades have resulted in a lowering of about 7 m of the water level. But heavy rainfall that occurred in 2008-09 and 2009-10 caused a marked rise. A multiple regression of sufficient quality (r = 0.87 binds the annual change (from august to august at differents parameters (weather conditions and initial level of the lake.

  1. OMEGA Thau : outil de management environnemental et de gestion de l'avertissement des pollutions microbiologiques du bassin de Thau

    OpenAIRE

    Brocard, Gilles; Derolez, Valerie; Serais, Ophelie; Fiandrino, Annie; Lequette, Camille; Lescoulier, Christophe; Benedetti, Murielle; Couton, Prunelle; Marty, Delphine

    2010-01-01

    Le projet OMEGA Thau (Outil de Management Environnemental et de Gestion de l’Avertissement de la lagune de Thau) est un programme de recherche et développement, à maîtrise d'ouvrage du Syndicat Mixte du Bassin de Thau, associant des scientifiques, des autorités et collectivités locales ainsi que des professionnels de la conchyliculture. Il vise à élaborer un outil d'aide à la décision des gestionnaires pour orienter les investissements publics sur le bassin versant, afin d'obtenir une qualité...

  2. Chapitre 2. Le régime juridique du bassin de 1885 a 1960

    OpenAIRE

    Mubiala, Mutoy

    2014-01-01

    Le bassin du Congo comme voie de communication représentait un tel enjeu pour l’exploitation coloniale que les puissances impliquées dans la course aux colonies (“Scramble for Africa”) devaient se résoudre à adopter un régime d’internationalisation susceptible de satisfaire plus ou moins les intérêts de tous. Ce régime spécial fut établi à l’issue du congrès de Berlin (novembre 1884-février 1885) et modifié par la conférence de Saint-Germain-en-Laye (1919). Les principes essentiels du régime ...

  3. Rôle des coopératives dans le fonctionnement du bassin de collecte laitier du Tadla, Maroc

    OpenAIRE

    Le Gal , P.-Y.; Oudin , E.; Kuper , M.; Moulin , C.-H.; Sraïri , T.

    2007-01-01

    International audience; Le bassin de collecte laitier situé sur le périmètre du Tadla se structure autour d'une usine de transformation industrielle approvisionnée par une myriade de petits éleveurs. Cette atomisation de l'offre a rendu nécessaire la mise en place de coopératives de collecte chargées d'agréger l'offre et d'assurer la chaîne du froid au plus près des producteurs. De fait, ces coopératives jouent un rôle central d'intermédiaire dans la chaîne d'approvisionnement allant de l'eau...

  4. Caractérisation de la végétation ligneuse du bassin versant de la ...

    African Journals Online (AJOL)

    Le bassin versant de la Maggia est située dans la région de Tahoua. La présente étude vise à caractériser la végétation ligneuse du bassin versant sur le plan de sa composition floristique et de sa structure. Les données ont été collectées au moyen des relevés floristiques, de mesures de diamètres à 1,30 m pour les.

  5. Géochimie organique du bassin de Paris Organic Geochemistry of the Paris Basin

    Directory of Open Access Journals (Sweden)

    Espitalie J.

    2006-11-01

    Full Text Available On présente ici les principaux résultats de l'étude géochimique réalisée, dans le bassin de Paris, à partir des déblais et des carottes provenant de 100 sondages pétroliers ou miniers, et des huiles prélevées dans les réservoirs du Mésozoïque (Trias, Bathonien supérieur, Néocomien. Les différentes méthodes géochimiques utilisées sont la pyrolyse, particulièrement bien adaptée à l'étude des nombreux échantillons de déblais recueillis, la chromatographie en phase gazeuse pour l'analyse détaillée des huiles et des extraits de roche, la spectrométrie de masse pour l'étude des biomarqueurs. Les époques principales de formation de l'huile et du gaz ont été déterminées par simulation sur ordinateur d'un modèle mathématique de genèse des hydrocarbures. Les méthodes de pyrolyse ont permis de dresser des logs géochimiques des forages étudiés et de déterminer, par le calcul, les paramètres de pyrolyse initiaux des roches-mères, avant leur enfouissement. On a pu ainsi établir, dans le périmètre étudié, des cartes de carbone organique initial, de potentiels pétroliers totaux et de quantités d'HC migrés. L'ensemble de ces résultats montre que les roches-mères de la grande majorité des huiles du Mésozoïque sont situées dans le Lias, s'échelonnant depuis le Toarcien jusqu'à l'Hettangien et que les meilleures zones de potentiel pétrolier du Bassin sont localisées à l'emplacement des régions de forte subsidence à l'époque du Lias. L'étude détaillée des hydrocarbures et celle des biomarqueurs ne permettent pas de distinguer les différentes huiles entre elles, quelle que soit leur profondeur, ni de leur attribuer une origine précise à partir des différents niveaux du Lias. Les cartes de migration mettent en évidence des déplacements latéraux des hydrocarbures dans certaines roches-mères (cas du Toarcien inférieur. Elles montrent aussi un déficit important en hydrocarbures à la base du

  6. Evolution tectono-sédimentaire du bassin de Talara (nord-ouest du Pérou

    Directory of Open Access Journals (Sweden)

    1987-01-01

    Full Text Available Le bassin pétrolier de Talara, dans le nord-ouest du Pérou, est rempli par des séries terrigènes fluvio-deltaïques du Campanien à l'Eocène Supérieur. Cinq cycles de sédimentation (A, B, C, D, E sont définis par des séquences grano-décroissantes d'approfondissement du bassin, à l'exception du cycle B qui résulte de la progradation du système fluviatile. L'activité tectonique distensive qui domine l'évolution du bassin et contrôle la nature et la répartition des sédiments est interrompue, pendant l'Eocène Moyen, lorsque des chevauchements vers le sud-est se mettent en place dans la série tertiaire décollée du socle. Au front des chevauchements actifs, se forment des olistolithes ainsi que des brèches syntectoniques. L'analyse de la déformation en avant des failles inverses montre que les chevauchements se faisaient vers le sud-est et qu'ils affectaient des sédiments peu lithifïés. La cuenca sedimentaria y petrolera de Talara, en el noroeste del Perú, está rellena por secuencias fluvio-deltaicas del Campaniano al Eoceno Superior. Cinco ciclos de sedimentación (A,B,C,D,E están definidos por secuencias grano-decrecientes de hundimiento, excepto el ciclo B que representa una secuencia grano-creciente de progradación fluvial. La tectónica en distensión domina la evolución de la cuenca y también controla el tipo y la distribución de los sedimentos. Sin embargo, durante el Eoceno Medio, suceden cabalgamientos hacia el sureste, dentro de la cubierta sedimentaria terciaria despegada sobre el basamento paleozoico. Olistolitos y brechas tectónicas se forman en la parte frontal de los cabalgamientos donde el análisis de la deformación muestra que éstos se desarrollaron hacia el sureste y que afectaron sedimentos aún no litificados. Talara oil-basin in NW Peru is filled by fluvio-deltaic series of Campanian to Upper Eocene age. Five sedimentation Cycles (A,B,C,D,E are defined by fining-upward sequences resulting from

  7. Quelques aspects de l'évolution géomorphologique quaternaire du haut bassin du Magdalena (Colombie

    Directory of Open Access Journals (Sweden)

    1974-01-01

    Full Text Available Le bassin supérieur du Rio Magdalena présente les caractéristiques suivantes: 1 L'allure générale du bassin montre une influence très nette de la tectonique. Il s'est développé grâce à la présence d'un ensemble de blocs affaissés relativement les uns par rapport aux autres et entourés de blocs soulevés qui forment les limites du bassin. Dans certains cas des édifices volcaniques se superposent à ces blocs (Nevado del Huila, parâmes de Las Papas, par exemple. 2 Dans certaines parties du bassin (Nevado del Huila, environs du rio Mazamoras, et de Pitalito, le volcanisme s'est développé durant tout le Quaternaire. De la sorte, en général on observe un paroxysme volcanique durant la période d'accumulation de QIII dont la position géomorphologique est très semblable à celle du Mindel européen (Nebraska d'Amérique du Nord. Les matériaux volcaniques ont ainsi contribué à la mise en place de l'accumulation QIII mais cette accumulation n'est pas un produit du volcanisme car on l'observe bien développée dans des vallées ou il n'y eut aucune activité volcanique à cette époque. Ainsi, la mise en place du remplissage QIII provient d'une oscillation climatique. La granulométrie très grossière du matériel QIII provient de la combinaison du volcanisme et de cette oscillation climatique. 3 Dans le bassin, les événements morphogénétiques les plus saillants sont les suivants: - une incision extrêmement profonde des talwegs des avant l'accumulation de QIII cette incision a atteint au moins le niveau des rivières actuelles - la fossilisation des cañons incisés durant cette phase par l'accumulation très épaisse du matériel QIII. - postérieurement, a fonctionné une tendance très générale à l'incision uniquement interrompue par les phases d'accumulation QI et QII. Actuellement, cette incision n'est toujours pas arrivée au niveau atteint avant l'accumulation de QIII. Durant cette période d'incision des rivi

  8. Effet des conditions climatiques sur le niveau du lac Sidi Ali (Moyen Atlas, Maroc)

    OpenAIRE

    Sayad, Ahmed; Chakiri, Saïd; Martin, Claude; Bejjaji, Zohra; Echarfaoui, Hassan

    2012-01-01

    Le lac Sidi Ali est un lac naturel d'altitude (2070-2080 m), sans exutoire superficiel, déterminé par le barrage d'une coulée basaltique. Doté d'un bassin versant apparent de 15,6 km2, il est alimenté par des eaux de ruissellement et par des sources karstiques. Son niveau subit des variations très fortes, annuelles et interannuelles, sous le contrôle des conditions climatiques, et en particulier des pluies et de l'évapotranspiration. Les périodes de sécheresse qui ont marqué les trois dernièr...

  9. Qualité chimique et biologique du bassin de la Semois (partie Belge

    Directory of Open Access Journals (Sweden)

    LECLERCQ L.

    1996-04-01

    Full Text Available Les eaux du bassin de la Semois belge ont été étudiées, en 25 stations, sous différents aspects complémentaires : chimie, diatomées et invertébrés benthiques. Les méthodes utilisées sont l'indice de pollution organique (IPO, LECLERCQ et VANDEVENNE, 1987, un indice diatomique (ID, LECLERCQ, non publié et l'indice biologique global normalisé (IBGN, AFNOR, 1992. Grâce aux analyses chimiques et diatomiques, nous décrivons différents types d'eaux naturelles, à minéralisation croissante, et différents niveaux de pollution et d'eutrophication. Nous présentons une carte d e qualité détaillée, à l'usage des gestionnaires. Les diatomées apparaissent comme les bioindicateurs les plus fiables pour ces paramètres. Les invertébrés sont moins intéressants à utiliser. Ils sont pratiquement insensibles au type de minéralisation de l'eau (tout au moins au niveau de la famille, qui est le seul niveau d'identification possible en routine, mais ces organismes peuvent être plus sensibles au facteur substrat qu'à la pollution organique, conduisant alors à des estimations erronées.

  10. Analyse sédimentologique des 'Couches Rouges' du bassin intramontagneux de Sicuani (Sud du Pérou

    Directory of Open Access Journals (Sweden)

    1987-01-01

    Full Text Available Le bassin des 'Couches Rouges' de Sicuani (sud du Pérou est un bassin continental intramontagneux dont le fonctionnement débute dès les premiers mouvements tectoniques andins du Sénonien. La sédimentation est essentiellement d'origine fluviatile. Les termes les plus proximaux sont représentés par les rivières en tresse à galets et les plus distaux par la plaine d'inondation à chenaux divagants. Le sens constant des apports sédimentaires implique une paléopente régionale inclinée vers le nord. A cette époque, la principale source des sédiments n'est donc pas représentée par la Cordillère orientale mais plutôt par les reliefs situés au sud-ouest des affleurements. Le taux de sédimentation relativement élevé, le guidage des transits sédimentaires par d'anciennes failles majeures et l'existence de structures de déformation synsédimentaire compressives font du bassin de Sicuani un bassin tectoniquement actif, comparable à celui de Cuzco. La première phase tectonique andine ne correspond donc plus à un événement ponctuel mais bien au contraire à un continuum tectonique en compression au cours duquel se développe la sédimentation des 'Couches Rouges' sud péruviennes. Ce continuum tectonique est associé à une activité volcanique intermittente, en partie responsable de l'alimentation des bassins. La cuenca de las 'Capas Rojas' de Sicuani (sur del Perú es una cuenca continental intramontañosa cuyo funcionamiento empezó desde los primeros movimientos tectónicos andinos del Senoniano. La sedimentación tiene un origen fundamentalmente fluviátil. Los términos más proximales corresponden a ríos en trenza con cantos y los más distales a la llanura de inundación con canales divagantes. La permanencia del sentido de los aportes sedimentarios implica la existencia de una paleopendiente regional inclinada hacia el norte. Es así como, en esta época, la fuente principal de los sedimentos no estuvo representada por

  11. UN OUTIL D’AIDE Á LA GESTION DE L’ANGUILLE : LE TABLEAU DE BORD ANGUILLLE DU BASSIN LOIRE

    Directory of Open Access Journals (Sweden)

    BAISEZ A.

    2005-10-01

    Full Text Available L’anguille européenne (Anguilla anguilla, L. est longtemps apparue comme une espèce commune, représentant une composante majeure des milieux littoraux et des eaux continentales. La prise de conscience de la diminution de son abondance est réelle et engendre l’émergence de processus de gestion. Ce constat situe l’enjeu du Tableau de Bord Anguille du Bassin Loire mis en place en avril 2002 sous l’égide du COmité de GEstion des POissons MIgrateurs du Bassin de la Loire, des Côtiers Vendéens et de la Sèvre Niortaise. Son objectif in fine est de contribuer à une gestion et à un développement durable de l’espèce et de ses habitats. Il vise à surveiller les caractéristiques des stocks locaux présents et des habitats disponibles au moyen d’une collecte régulière et objective de données synthétisées sous forme d’indicateurs de population et de milieu. Le concept, le fonctionnement actuel et les applications de ce tableau de bord sont ici présentés.

  12. Données préliminaires sur la diversité du zooplancton du lac Nokoué

    African Journals Online (AJOL)

    SARAH

    31 juil. 2017 ... contribuera davantage à la compréhension de la dynamique de cette communauté biologique du lac. Mots clés ... dans une perspective de gestion durable de la .... ramenés au Laboratoire de Contrôle de Qualité des Eaux.

  13. [Fond du Lac archeological resources within the Draft Area Recommendation Report

    International Nuclear Information System (INIS)

    Danz, D.L.

    1986-01-01

    Research into archaeological resources of the Fond du Lac Band within the DOE proposed high-level nuclear waste sites resulted in the discovery of four traditional ancestral sites. A number of ancestral sites that are located within other proposed repository sites were also discovered

  14. cas du lac Fetzara, région de Annaba

    African Journals Online (AJOL)

    ruissellement, elles acquièrent une nouvelle composition différente de celle des eaux de pluie. Les apports par les précipitations météoriques. Chaque mois pluvieux a fait l'objet d'une analyse chimique et une moyenne des concentrations des eaux apportées au lac a été estimée. La quantité des éléments apportés par.

  15. Sulfur bacteria in sediments of two coastal ecosystems: the Bassin d'Arcachon and the Etang du Prévost, France

    NARCIS (Netherlands)

    Schaub, B E M; van Gemerden, H

    1996-01-01

    Enumeration of the functional groups of sulfur bacteria was performed in the sediments in the Bassin d'Arcachon, a mesotidal lagoon with strong tidal currents and dominant populations of seagrass (Zostera noltii), and in the Etang du Prevost, a shallow lagoon with moderate tidal fluctuations and

  16. Réponse équilibrée aux besoins en eau dans le bassin du Saïss au ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    21 avr. 2011 ... L'équipe du projet qu'il dirige actuellement, axé sur la demande en eau dans le bassin du Saïss, tente de concilier les points de vue et les besoins très variés des intervenants. « Nos recherches se concentrent certes sur les agriculteurs, mais également sur les autres intervenants préoccupés par les ...

  17. Géochimie et métallogénie des veines à Ag-Pb-Zn du bassin de Purcell, Colombie-Britannique

    OpenAIRE

    Paiement, Jean-Philippe

    2010-01-01

    Le bassin du Belt-Purcell est connu pour le gîte de type SEDEX de Sullivan et ses veines à Ag-Pb-Zn. Les veines du bassin de Purcell sont classées en trois types : 1) riches en Pb-Zn composées de sphalérite, galène, pyrrhotite, freibergite et pyrite; 2) riches en Pb-Ag-Cu-Au et composées de galène, pyrite, freibergite et d’or et; 3) veines et remplacements riches en Ag-Pb-Zn et composées de sphalérite, galène, pyrite et freibergite. La datation Ar/Ar de séricite hydrothermale du gîte de Type ...

  18. Caractérisation de la variabilité climatique : cas du bassin versant ...

    African Journals Online (AJOL)

    DK

    Cette étude présente l'intérêt de certaines méthodes statistiques, pour interpréter la variabilité spatiotemporelle ... Mots-clés : Sécheresse - Variabilité climatique - Fraction pluviométrique - Bassin versant Medjerda - Est de .... global actuel, aussi bien l'espérance ...... de l'Afrique de l'Ouest non sahélienne entre 1950-1989.

  19. Analyse comparée de bassins sédimentaires transtensionnels : le bassin de Santa Rosalia (Basse Californie du Sud, Mexique et de Mendibelza (Pyrénées, France

    Directory of Open Access Journals (Sweden)

    Bourrouilh- Le Jan, F.

    2005-12-01

    Full Text Available Cet article présente un analyse comparée de bassins sédimentaires liés a l’ouverture en cours du Golfe de Californie, avec le bassin d’ouverture ancien, jurassico-crétacés de Mendibelza dans les Pyrénées occidentales par l’ouverture du Golfe de Gascogne. Ce travail est une contribution à la compréhension de la sédimentation et des contrôles de bassins transtensionnels situés sur des marges divergentes obliques actuelles, dans le but d’utiliser ces modèles et de les comparer, pour mieux comprendre et interpréter les bassins anciens créés dans des contextes géodynamiques analogues, mais qui sont tectonisés. Le fil directeur est l’analyse comparée de ces bassins : - dans leur évolution tectonique, leur modélisation géométrique et les contraintes auxquelles ils ont été soumis, - dans l’enregistrement sédimentaire (séquences des épisodes d’ouverture, des forçages tectoniques, climatiques et sédimentaires qui ont accompagné la naissance, l’évolution et la tectonisation de ces bassins (Mendibelza. Ainsi, le bassin de Santa Rosalia a enregistré les étapes d’évolution parallèles à la formation du rift oblique du Golfe de Californie depuis le Miocène supérieur suivant 3 séquences : T1 (Miocène supérieur-Pliocène inférieur représente la phase syn-rift constituée de faciès de fan-delta; T2 (Pliocène inférieur à moyen représente la transition du rifting-drifting, marquée par une rupture brusque de la sédimentation et constitué de faciès de fan-delta passant à plate forme; T3 (Pliocène supérieur-Pléistocène est un cortège de haut niveau marin, marquant une deuxième pulsation de la subsidence du bassin de Santa Rosalia pendant l’ouverture généralisée du Golfe de Californie. La formation de Mendibelza est constituée de 3 séquences : - la séquence inférieure K1 de l’Albien inférieur, formée de faciès de front-delta et pro-delta déposés pendant la phase Syn-rift. K2

  20. Impact de la résolution des données d'occupation du sol sur la modélisation hydrologique d'un bassin versant périurbain: Application au bassin versant de la Chézine

    OpenAIRE

    POIRIER, Arnaud

    2012-01-01

    Les bassins versant périurbains présentent deux types d'occupation du sol, urbain et rural. Cette hétérogénéité d'occupation entraine la concomitance de deux comportements hydrologiques différents. Ce type de bassin est encore peu étudié de nos jours. Le modèle ISBA-TOPMODEL a été adapté aux bassins périurbains et appliqué au bassin de la Chézine (Nantes). Le but de ce travail a été d'étudier la sensibilité de ce modèle à la donnée la d'occupation du sol. Pour réaliser cette étude nous ...

  1. De Paris à Lyon. Les mutations éditoriales du «Lancelot du Lac»

    Directory of Open Access Journals (Sweden)

    Gaëlle Burg

    2015-07-01

    Full Text Available Lancelot du Lac est le premier roman arthurien imprimé à la Renais­sance. Dans sa première édition parue en 1488, qui réunit deux imprimeurs (Jean Le Bourgeois à Rouen et Jean Du Pré à Paris, un découpage et un prologue inédits sont ajoutés par le remanieur. Le texte sera réédité six fois par divers imprimeurs-libraires parisiens jusqu’en 1533. L’édition de luxe d’Antoine Vérard (1494, destinée au roi Charles VIII, présente d’importantes modifications effectuées dans un but commercial. Après une longue période d’accalmie qui signe le début du déclin de la vogue des romans de chevalerie médiévaux, Benoît Rigaud publie à Lyon, sous une forme considérablement abrégée, la dernière édition connue du Lancelot au XVIe siècle (1591. Si elle ne présente que peu d’intérêt littéraire, elle apporte cependant des informations concernant les pratiques éditoriales et les goûts du  lecteur de la fin du XVIe siècle. De Paris à Lyon, entre renaissance et déclin, le parcours éditorial d’un incontournable roman arthurien.Lancelot du Lac is the editio princeps of an Arthurian romance in Renaissance France. The first edition in 1488, which brings together two printers (Jean Le Bourgeois from Rouen and Jean Du Pré from Paris, offers original arrangement and prologue added by the compositor. The text will be published six times by various printers and booksellers in Paris until 1533. The luxurious edition from Antoine Vérard (1494 dedicated to King Charles VIII provides interesting transformations in commercial purposes. After a long time without edition, showing the beginning of chivalry literature’s decline, Benoît Rigaud publish in Lyon, in a greatly abbreviated form, the last known edition of Lancelot in the XVIth century (1591. If it presents no literary interest, it provides nevertheless informations about editorial practices and reader’s tastes from the end of Renaissance France. From Paris to

  2. Thermal cracking in Lac du Bonnet granite during slow heating to 205 degrees celsius

    International Nuclear Information System (INIS)

    Chernis, P.J.; Robertson, P.B.

    1993-09-01

    Acoustic emissions (AE) were recorded as drill core samples of Lac du Bonnet granite were slowly heated to between 66 and 205 degrees celsius to evaluate the effects of temperature on the properties of rock samples. Longitudinal and shear velocities of the samples were measured, and Young's moduli, shear moduli and Poisson's ratios were calculated. No significant AE activity was detected until temperatures reached approximately 73-80 degrees celsius. Above this 'threshold' temperature, calculated rock properties decreased, and at 205 degrees celsius calculated Young's modulus, shear modulus, and Poisson's ratio were reduced by 30, 26, and 29% respectively

  3. Lac du Flambeau Band of Lake Superior Chippewa Indians Strategic Energy Plan

    Energy Technology Data Exchange (ETDEWEB)

    Bryan Hoover

    2009-11-16

    This plan discusses the current energy use on the Lac du Flambeau Reservation, the current status of the Tribe's energy program, as well as the issues and concerns with energy on the reservation. This plan also identifies and outlines energy opportunities, goals, and objectives for the Tribe to accomplish. The overall goal of this plan is to address the energy situation of the reservation in a holistic manner for the maximum benefit to the Tribe. This plan is an evolving document that will be re-evaluated as the Tribe's energy situation changes.

  4. Variabilité journalière de la qualité physico-chimique du lac M'koa ...

    African Journals Online (AJOL)

    d'enrichissement en matières organique, azote et phosphore capables d'influer sur la teneur de saturation en oxygène dissous. La Figure 4 montre des lavandiers communément appelés "fanico" exerçant leur activité quotidienne au lac. Cette activité est source d'enrichissement des eaux du lac. M'koa en phosphore et ...

  5. Hydrogeologic characteristics of domains of sparsely fractured rock in the granitic Lac Du Bonnet Batholith, southeastern Manitoba, Canada

    International Nuclear Information System (INIS)

    Stevenson, D.R.; Kozak, E.T.; Davison, C.C.; Gascoyne, M.; Broadfoot, R.A.

    1996-06-01

    The hydrogeologic characteristics of the granitic Lac du Bonnet batholith in southeastern Manitoba have been studied since 1978, as part of AECL's program to assess the concept of disposing of Canada's nuclear fuel waste deep within plutonic rocks of the Canadian Shield (Davison et al. 1994a). These studies have included an extensive program of drilling, logging, testing, sampling and monitoring in 19 deep surface boreholes drilled at Grid areas located across the Lac du Bonnet batholith, at the Whiteshell Laboratory (WL), and in surface and underground boreholes at the Underground Research Laboratory (URL). Based on these investigations domains of low permeability, sparsely fractured rock (SFR) have been identified in the Lac du Bonnet batholith

  6. Caractérisation de la variabilité climatique : cas du bassin versant ...

    African Journals Online (AJOL)

    DK

    anticlinaux plus étroits ... annuels des précipitations, est que, du point de vue stochastique, ceux-ci peuvent être considérés comme un .... uniforme pour la position du point de rupture la statistique U de Buishand est définie par. Ou: Pour k = 1, ..., N et ...

  7. Les conséquences financières de l'épisode pluvieux dans le bassin-versant du Buëch, 1993-1994

    Directory of Open Access Journals (Sweden)

    Pierre PECH

    1994-12-01

    Full Text Available Les épisodes pluvio-orageux d’octobre 1993 et de janvier 1994 sont à l’origine de nombreux dommages dans les communes du bassin-versant du Buëch (Hautes-Alpes. La cartographie des phénomènes naturels et de leurs coûts permet de définir une typologie de communes en fonction de l’ampleur de ces dégâts et ces coûts. Les villes et les petites communes rurales montagnardes subissent des charges financières lourdes pour des raisons totalement différentes: dans un cas l’urbanisation est responsable des coûts, dans l’autre c’est la morphologie des versants.

  8. Dating fractures and fracture movement in the Lac du Bonnet Batholith

    International Nuclear Information System (INIS)

    Gascoyne, M.; Brown, A.; Ejeckam, R.B.; Everitt, R.A.

    1997-04-01

    This report examines and summarizes all work that has been done from 1980 to the present in determining the age of rock crystallization, fracture initiation, fracture reactivation and rates of fracture movement in the Lac du Bonnet Batholith to provide information for Atomic Energy of Canada Limited's (AECL) Canadian Nuclear Fuel Waste Management Program. Geological and petrographical indicators of relative age (e.g. cross-cutting relationships, sequences of fracture infilling minerals, P-T characteristics of primary and secondary minerals) are calibrated with radiometric age determinations on minerals and whole rock samples, using 87 Rb- 87 Sr, 40 K- 39 Ar, 40 Ar- 39 Ar and fission track methods. Most fractures and fracture zones inclined at low angles are found to be ancient features, first formed in the Early Proterozoic under conditions of deuteric alteration. Following some movement on fractures in the Late Proterozoic and Early Paleozoic, reactivation of fractures during the Pleistocene is established from uranium-series dating methods and use of stable isotopic contents of fracture infilling minerals (mainly calcite). Some indication of movement on fracture zones during the Pleistocene is given by electron spin resonance dating techniques on fault gouge. The slow rate of propagation of fractures is indicated by mineral infillings, their P-T characteristics and U-series calcite ages in a fracture in sparsely fractured rock, accessible from AECL's Underground Research Laboratory. These results collectively indicate that deep fractures observed in the batholith are ancient features and the fracturing and jointing in the upper 200 m is relatively recent (< 1 Ma) and largely a result of stress release. (author)

  9. Le remplissage synrift au permien et au trias du bassin de Tahanaout (Haut Atlas de Marrakech, Maroc géodynamique et organisation sédimentaire

    Directory of Open Access Journals (Sweden)

    Nassili, M.

    2004-12-01

    Full Text Available The perno-triasic basin of Tahanaout reflects a tectono-sedimentary organization typical of synrift basins. The genetic modes of its replenishment, reviewed in light of the sedimentary heterogeneity and the position of the sediments reveal an evolution in 3 episodes: individualization, differentiation and homogenization. The tectonics expresses itself every time, by a reorganization of the deposit areas, a dissymmetry of the syntectonic gutters and structures in the tilled blocks, within a NS extensional regime (episode 1 and NW-SE even (episode 11 and 111. The intermediate sequences follow each other in sequences of deposit that reflect and evolve in fluvio-deltaic environments, since the cone toward the alluvial or deltaic plain according to a topographic gradient. The sedimentary model suggests the existance basins in vertical relays in severa1 lateral progradation phases interrupted by phases of silt-clay sedimentary aggradations. The generalized semi-arid climate and the closed country environment plays an important role in the configuration of this type of basins, whose borders are essentially clastics, of an extended alluvial plain.Le bassin permo-triasique de Tahanaout reflète une évolution typique des bassins synrifts. Les modalités génétiques de son remplissage, révèlent une organisation en 3 épisodes tectonosédimentaires: l’individualisation, la différenciation et l’homogénéisation du bassin. La tectonique s’exprime par la création de gouttières syntectoniques et de structures en blocs basculés et s’inscrit dans un régime extensif N-S (épisode I puis NW-SE (épisodes II et III. La sédimentation continentale s’organise en plusieurs cycles de progradation – rétrogradation; dans laquelle, les séquences du milieu retracent toute la dynamique des environnements fluvio-deltaïques, depuis le cone vers la plaine alluviale ou deltaïque selon un gradient topographique décroissant. Le modèle s

  10. Déclin et restauration de la population de truites lacustres (Salmo trutta lacustris L. du lac de Constance

    Directory of Open Access Journals (Sweden)

    RUHLÉ C.

    1990-10-01

    Full Text Available Le déclin de la population de truites migratrices du lac de Constance a débuté vers 1950 quand un barrage a été construit sur le Rhin, affluent principal de ce lac, coupant ainsi l'accès aux plus importantes frayères. Ceci a suffi de prétexte pour renoncer à une longueur de capture garantissant la reproduction naturelle. Par la suite, la population en train de diminuer a servi de justification pour des déversements importants de truites arc-en-ciel. Un désintérêt croissant pour le maintien de frayères dans les affluents secondaires a, finalement, contribué à la baisse des captures de 12.000 kg à 3.000 kg entre 1950 et 1980.Les mesures réalisées au cours des dernières années pour restaurer la population de truites lacustres ont du succès. Il s'agit surtout de : — la détermination d'une nouvelle longueur de capture ainsi que de périodes de protection respectant la reproduction des truites migrant à longue et à courte distance,— l'élevage de stocks de géniteurs, — les déversements forcés et effectués surtout en affluents (au lieu du lac,— l'interdiction d'immersions de truites arc-en-ciel,— l'abolition de barrages. Le succès se manifeste par un nombre croissant de truites observées frayant dans les affluents ainsi que par des captures de plus en plus nombreuses faites par la pêche professionnelle.

  11. Caractérisation spatio-temporelle du régime pluviométrique du haut bassin du fleuve Sénégal dans un contexte de variabilité climatique

    Directory of Open Access Journals (Sweden)

    Alain Dezetter

    2011-07-01

    Full Text Available Les écoulements et par conséquent les ressources en eau constituent la réponse des bassins versants aux impulsions pluviométriques. En Afrique de l'Ouest et Centrale, on assiste depuis les années 1970 à une sécheresse sans précédent, ainsi qu'à une grande variabilité spatiale et temporelle des pluies, caractéristique du domaine tropical. L'objectif de ce travail est de définir la variabilité spatio-temporelle des précipitations à l'échelle du haut-bassin du fleuve Sénégal à partir des données de dix stations de référence. Le choix des stations obéit à des critères de qualité des données (lacunes peu nombreuses et de proximité avec le bassin versant. Dans un premier temps, des tests statistiques d'homogénéité ont été appliqués aux séries de pluies annuelles de l'origine des stations à 2005. Les séries analysées présentent toutes des ruptures. Sur les dix stations étudiées, huit présentent une rupture comprise entre 1960 et 1970 et les déficits ultérieurs varient entre 12 et 24 %. À l'échelle mensuelle, après reconstitution des données manquantes, il apparaît que les précipitations ont diminué significativement pour presque tous les mois entre les deux périodes. À l'échelle journalière, l'analyse des fractions pluviométriques journalières met en évidence une tendance à la diminution du cumul annuel moyen des pluies supérieures à 40 mm (qui sont considérées comme les grosses pluies à partir des années de rupture. Nous avons ensuite caractérisé la variabilité spatiale des précipitations annuelles moyennes sur 30 et 10 ans, puis les écarts par rapport à la décennie de référence 1961-1970. Il apparaît ainsi que le sud du bassin présente les excédents les plus forts durant les périodes excédentaires, mais aussi les déficits les plus élevés en périodes déficitaires.Runoff and consequently water resources constitute the response of watersheds to pluviometric impulses

  12. Évaluation du niveau de pollution par les métaux lourds des lacs ...

    African Journals Online (AJOL)

    La présente étude a pour objectif principal d'évaluer le niveau de pollution métallique des lacs Bini et Dang (Ngaoundéré, Cameroun) à travers l'analyse des eaux et des sédiments de surface. La concentration des métaux lourds (Ni, Cr, Fe, Pb, Cd, Zn) a été mesurée par spectrophotométrie d'absorption atomique.

  13. Variabilité des séries pluviométriques du bassin versant de la ...

    African Journals Online (AJOL)

    la cote des postes pluviométriques est importante, plus ... positions géographiques sur le territoire du ..... Thèse de Doctorat d'état en Géologie appliqué Université. Abou Bekr Belkaid ... versants représentatifs du Maroc, Thèse de Doctorat en.

  14. Organic Matter in the Early Toarcian Shales, Paris Basin, France: a Response to Environmental Changes La matière organique dans les argiles du Toarcien inférieur du bassin de Paris, France : un enregistrement des changements d'environnement

    Directory of Open Access Journals (Sweden)

    Hollander D. J.

    2006-11-01

    entre carbone organique et carbone minéral peut être utilisé comme un moyen pour déterminer l'importance relative de ces deux facteurs. Ce paramètre, qui reflète la concentration en CO2 dissous à la surface de l'eau, présente des valeurs faibles lors des épisodes de forte productivité dans un lac eutrophique et par analogie, dans les zones de forte productivité primaire, des valeurs élevées lors des épisodes de faible productivité de ce même lac, et par analogie, dans les bassins confinés et stratifiés. La base de la série étudiée est caractérisée par l'accumulation la plus importante de matière organique présentant l'état de préservation maximum, dépôt qui a eu lieu lorsque la teneur en CO2 dissous à la surface de l'eau était la plus élevée. Ceci suggère que l'environnement était donc du type bassin confiné et stratifié avec une productivité primaire faible à modérée, où intervenait un recyclage important des eaux intermédiaires enrichies en 12C-CO2. Le passage de la matière organique dans une colonne d'eau qui devait être anoxique à faible profondeur, peut-être immédiatement sous la zone euphotique, et son dépôt sur un fond anoxique et peu perturbé, en assureraient la très bonne préservation. Dans la partie moyenne de la section, les différents résultats suggèrent une diminution de la tranche d'eau basale appauvrie en oxygène et l'approfondissement de la limite redox, qu'on peut relier à de multiples facteurs tels une décroissance de la productivité, un changement dans le régime de circulation des eaux, ou encore une modification du climat. Cet intervalle est aussi caractérisé par une diminution de la préservation de la matière organique qui peut refléter une plus grande oxygénation de la colonne d'eau. Mais toutes les autres conditions (populations, conditions de fond . . . restent inchangées. Les tendances observées dans la partie supérieure reflètent une stabilisation du régime de circulation

  15. ÉVOLUTION SPATIO-TEMPORELLE DE LA CONTRIBUTION DU REPEUPLEMENT EN TRUITE (SALMO TRUTTA L. RÉALISÉ A DES STADES PRÉCOCES DANS LE BASSIN AMONT DU FIER (74.

    Directory of Open Access Journals (Sweden)

    CAUDRON A.

    2002-04-01

    Full Text Available Les pratiques de repeuplement en truite à des stades précoces (alevins nourris et truitelles 3-5 cm ont été évaluées par la technique de fluoromarquage des otolithes sur le bassin amont du Fier pour trois cohortes (1995, 1996, 1997. La contribution du repeuplement et du recrutement naturel a été suivie à la fois dans la population en place et dans les captures par pêche à la ligne. Au stade 0+ en place à l’automne, la contribution des poissons alevinés est relativement importante pour les trois cohortes considérées. Cependant, l’analyse du rapport entre le nombre d’alevins introduits au printemps et le nombre de truitelles recapturées à l’automne fait apparaître un taux d’implantation très faible des 0+ marqués quelle que soit la densité alevinée. La contribution des marqués chute brutalement au stade 1+ en place (cohorte 95 et 96 et devient très faible. Cette tendance se poursuit au stade 2+ en place pour la cohorte 95 avec des taux de marqués qui diminuent encore. Dans les captures par pêche à la ligne le taux de 2+ marqués est supérieur à celui observé dans la population en place à l’automne mais la contribution du recrutement naturel reste toujours dominante. Ensuite, la contribution de repeuplement suit la même dynamique que dans la population en place puisqu’il diminue avec l’âge. Elle devient négligeable au stade 3+ et nulle à partir de 4+.

  16. Étude palynologique du Dévonien terminal et du Carbonifère inférieur du bassin d'Illizi (Fort-Polignac, Algérie Palynological Study of the Uppermost Devonian and Lower Carboniferous in the Illizi Basin (Fort-Polignac, Algeria

    Directory of Open Access Journals (Sweden)

    Attar A.

    2006-11-01

    Full Text Available L'étude de la microflore des formations Djebel llleréne, Issendjel, Assekaïfaf, Oubarakat et El Adeb Larache du bassin d'Illizi (Sahara algérien a permis d'établir, depuis le Dévonien terminal jusqu au Namurien, six palynozones. Une comparaison est faite avec les travaux de Lanzoni et Magloire et de Massa et al. (bassin de Rhadamès, Libye occidentale. A study of microflora from the Djebel Illeréne, Issendjel, Assekaïfaf, Oubarakat und El Adeb Larache formations in the Illizi Basin (Algerian Sahara has enabled six palynozones to be identified in the interval between the uppermost Devonian and the Namurian. The findings are compared with those by Lanzoni and Magloire (Grand Erg Occidental, Algerian Sahara and Massa et al. (Rhadamès Basin, western Libya.

  17. Lac dayet Aoua (Maroc)

    African Journals Online (AJOL)

    Saad

    F.S.T. Fès - Sais, Université Sidi Mohammed Abdallah Fès, B.P. 2202, Maroc. 2Laboratoire des ... d'étude en complément de la composition phytoplanctonique et des analyses de la physico-chimie des eaux à l'entrée, au ... L'analyse des paramètres physico-chimiques, au point central du lac, a montré que l'eau du lac.

  18. Assessment of aquifer properties, evapotranspiration, and the effects of ditching in the Stoney Brook watershed, Fond du Lac Reservation, Minnesota, 2006-9

    Science.gov (United States)

    Jones, Perry M.; Tomasek, Abigail A.

    2015-01-01

    The U.S. Geological Survey, in cooperation with the Fond du Lac Band of Lake Superior Chippewa, assessed hydraulic properties of geologic material, recharge, and evapotranspiration, and the effects of ditching on the groundwater resources in the Stoney Brook watershed in the Fond du Lac Reservation. Geologic, groundwater, and surface-water data were collected during 2006–9 to estimate hydrologic properties in the watershed. Streamflow and groundwater levels in the shallow glacial deposits in the Stoney Brook watershed were analyzed to estimate groundwater-flow directions, groundwater recharge, and evapotranspiration within the watershed and to assess the effect of ditches on surrounding groundwater resources. Groundwater, streamflow, and precipitation data collected during the study (2006–9) can be used to update the U.S. Department of Agriculture’s Natural Resource Conservation Service and Fond du Lac Resource Management Division surface-water models, which are used to evaluate the effect of proposed adjustments to the ditching system on streamflow on wild rice production and aquatic habitats.

  19. Sedimentary Basins of the Republic of Yemen : Their Structural Evolution and Geological Characteristics Evolution structurelle et caractéristiques géologiques des bassins sédimentaires de la république du Yemen

    Directory of Open Access Journals (Sweden)

    Beydoun Z. R.

    2006-11-01

    rejuvenation of the ancient NW-SE Najd fault system with subordinate strike-slip motion. The Tertiary basins are related to separation of Arabia from Africa in the Neogene along the Gulf of Aden and Red Sea trends. The principal uplifts are of equal antiquity, the oldest and most persistent being the Hadhramawt Arch. All the tectonic activity is linked to Gondwanan fragmentation and breakup from the initial closure of the paleo-Tethys and opening of the neo-Tethys in late Carboniferous to Permian times, and the development of the African Karoo system, through separation of India from Afro-Arabia in the Cretaceous to ultimate separation of Arabia from Africa in the Neogene. Within individual basins, compartmentalisation by sub-parrallel highs into graben-like and half-graben sub-basins or sectors is related to local adjustments to this continuing motion within the overall structural framework. Il y a peu de temps encore, on ne disposait que de peu d'informations sur la distribution et l'évolution des bassins sédimentaires au Yemen, puisque les données existantes reposaient entièrement sur la géologie de surface et les corrélations des formations stratigraphiques anciennes étudiées uniquement dans les redressements situés en bordure du golfe d'Aden et de la mer Rouge, ou sur le haut plateau au nord-ouest où l'on a réalisé des coupes en profondeur. Partout ailleurs, la couche tabulaire de sédiments du Tertiaire et de laves du groupe volcanique du Tertiaire masquait les principaux éléments structurels précénozoïques sous-jacents ainsi que les diverses successions sédimentaires. Les premières tentatives de délinéation de la structure des sols du pays furent donc rudimentaires et/ou ne pouvaient être que partiellement correctes. La découverte de champs de pétrole et de gaz rentables dans plusieurs fossés d'effondrement mesozoïques, à l'intérieur du Yemen, à la fin des années quatre-vingt et au début des années quatre-vingt-dix après l

  20. BILAN DES ACTIONS DU PLAN MIGRATEURS CONCERNANT L’ALOSE FEINTE (ALOSA FALLAX RHODANENSIS SUR LE BASSIN RHÔNE-MÉDITERRANÉE-CORSE.

    Directory of Open Access Journals (Sweden)

    LEBEL I.

    2001-07-01

    1991 a été réalisé pour amorcer la réflexion sur l’efficacité et l’orientation à donner au plan migrateurs pour compléter les objectifs prévus ainsi qu’optimiser et étendre le programme de restauration : - mettre en place un tableau de bord des indicateurs du potentiel « migrateurs », des actions de suivi et d’aménagement, afin d’améliorer la lisibilité du programme, A l’issue des sept années d’études et de travaux, l’objectif principal sur le Rhône est d’améliorer les connaissances d’un point de vue quantitatif mais également qualitatif avec l’évaluation du stock d’aloses et du flux migratoire sur le premier obstacle. Parallèlement, une extension du volet aloses du plan migrateurs aux autres bassins méditerranéens français a été engagée sur l’Aude, l’Hérault, le Vidourle, l’Argens et le Tavignano en Corse.

  1. Imagerie sismique d'un réservoir carbonaté : le dogger du Bassin parisien Seismic Imaging a Carbonate Reservoir: the Paris Basin Dogger

    Directory of Open Access Journals (Sweden)

    Mougenot D.

    2006-11-01

    Full Text Available Dans le cadre des mesures incitatives de relance de l'exploration en France prises par la Dhyca(1, six partenaires industriels(2 se sont réunis (Projet Dogger, 1991-93 pour développer une méthodologie d'acquisition, de traitement et d'interprétation sismique, adaptée à la description du réservoir à huile du Dogger du Bassin parisien et utilisant des techniques déjà industrialisées : vibrosismique à contenu fréquentiel élevé (10-130 Hz, sismique réflexion à 3 dimensions ou à 3 composantes, émissions P et S, traitement élaboré du signal et des statiques, préservation des amplitudes, calage aux puits, inversion stratigraphique, interprétation 3D par pointé automatique et attributs d'horizon. L'utilisation conjointe de toutes ces techniques sur les champs de Villeperdue (Total opérateur et de Fontaine-au-Bron (EAP opérateur montre l'adaptation de la sismique de surface à décrire certaines caractéristiques du réservoir mince (30 m situé au toit du Dogger carbonaté, à 1900 m de profondeur. L'élargissement du contenu fréquentiel de la sismique se heurte aux limites imposées par l'atténuation des hautes fréquences lors de leur propagation dans le sous-sol. L'évaluation de cette atténuation par un PSV indique un filtrage terrain jusqu'au Dogger (1,3 s td fortement amplifié au-delà de 90 Hz. La sismique 2D dite haute résolution (HR permet d'atteindre au niveau de l'objectif cette fréquence charnière qui fournit une résolution verticale suffisante pour que les réflexions situées au sommet et à la base du réservoir n'interfèrent pas (lambda/2 = 26 m. L'amplitude de ces réflexions est alors représentative des contrastes d'impédance de part et d'autre du réservoir et leurs variations latérales permettent de détecter des hétérogénéités, comme les variations de porosité, qui s'expriment bien acoustiquement. Le contenu en hautes fréquences de la sismique 3D (70 Hz a été plus difficile à am

  2. Simulation of groundwater flow and interaction of groundwater and surface water on the Lac du Flambeau Reservation, Wisconsin

    Science.gov (United States)

    Juckem, Paul F.; Fienen, Michael N.; Hunt, Randall J.

    2014-01-01

    The Lac du Flambeau Band of Lake Superior Chippewa and Indian Health Service are interested in improving the understanding of groundwater flow and groundwater/surface-water interaction on the Lac du Flambeau Reservation (Reservation) in southwest Vilas County and southeast Iron County, Wisconsin, with particular interest in an understanding of the potential for contamination of groundwater supply wells and the fate of wastewater that is infiltrated from treatment lagoons on the Reservation. This report describes the construction, calibration, and application of a regional groundwater flow model used to simulate the shallow groundwater flow system of the Reservation and water-quality results for groundwater and surface-water samples collected near a system of waste-water-treatment lagoons. Groundwater flows through a permeable glacial aquifer that ranges in thickness from 60 to more than 200 feet (ft). Seepage and drainage lakes are common in the area and influence groundwater flow patterns on the Reservation. A two-dimensional, steady-state analytic element groundwater flow model was constructed using the program GFLOW. The model was calibrated by matching target water levels and stream base flows through the use of the parameter-estimation program, PEST. Simulated results illustrate that groundwater flow within most of the Reservation is toward the Bear River and the chain of lakes that feed the Bear River. Results of analyses of groundwater and surface-water samples collected downgradient from the wastewater infiltration lagoons show elevated levels of ammonia and dissolved phosphorus. In addition, wastewater indicator chemicals detected in three downgradient wells and a small downgradient stream indicate that infiltrated wastewater is moving southwest of the lagoons toward Moss Lake. Potential effects of extended wet and dry periods (within historical ranges) were evaluated by adjusting precipitation and groundwater recharge in the model and comparing the

  3. ESSAI D’EVALUATION DU STOCK DE GÉNITEURS D’ALOSE ALOSA ALOSA DU BASSIN VERSANT GIRONDE-GARONNE-DORDOGNE SUR LA PERIODE 1987-2001 ET COMPARAISON DE DIFFERENTS INDICATEURS D’ABONDANCE

    Directory of Open Access Journals (Sweden)

    CHANSEAU M.

    2004-04-01

    migratoires. Des mesures de la température de l’eau au niveau de la confluence Garonne-Dordogne seraient fort utiles et permettraient d’appréhender plus précisément l’influence des facteurs environnementaux sur cette répartition. Une augmentation de la proportion de poissons empruntant le cours d’eau Dordogne semble se dessiner ces dernières années puisque 44 % en moyenne des géniteurs sont remontés sur cet axe sur la période 1993-2001 contre 25 % en moyenne sur la période 1987-1992. Le stock reproducteur (stations de contrôle + frayères paraît être globalement un bon indicateur d’abondance de l’alose vraie sur le bassin en raison notamment de la relative stabilité des mortalités par pêche sur la période d’étude. Les CPUE issues du suivi de la pêcherie sont significativement reliées au stock total ainsi qu’aux effectifs estimés remontant sur les deux axes migratoires, indiquant qu’elles sont également un bon indicateur de l’abondance de l’alose. Elles ne sont toutefois pas à même de réellement refléter l’état du stock reproducteur et son évolution, bases de gestion de la population.

  4. Sédimentation et tectonique dans le bassin marin Eocène supérieur-Oligocène des Alpes du Sud Sedimentation and Tectonics in the Upper Eocene-Oligocene Marine Basin in the Southern Alps

    Directory of Open Access Journals (Sweden)

    Riche P.

    2006-11-01

    Full Text Available Des études de terrain détaillées ont été reprises récemment par l'Institut Français du Pétrole (IFP et l'Ecole Nationale Supérieure du Pétrole et des Moteurs (ENSPM dans la partie occidentale du bassin nummulitique des Alpes du Sud afin d'aider les interprétations de données sismiques. Ces études soulignent l'importance de la tectonique en distension qui a affecté le bassin durant la sédimentation; elles remettent en question l'interprétation géodynamique de ce bassin considéré classiquement comme une avant-fosse de la chaîne alpine en cours de formation. Sur un substratum mésozoïque structuré par la phase pyrénéo-provençale, la transgression nummulitique envahit dès le Lutétien les parties les plus basses du bassin situé à l'Est dans une zone qui sera oblitérée au Mio-Pliocène par l'accident pennique. Elle s'étend progressivement vers l'Ouest durant l'Eocène supérieur. Dans le même temps une phase de distension E-O bien visible le long des failles du Var et en bordure du Pelvoux se traduit par le compartimentage des bordures du bassin et par des jeux en blocs basculés durant la sédimentation. Dans les calcaires qui débutent la série marine, ces jeux sont responsables du passage rapide de faciès de plate-forme à des faciès resédimentés sur les pentes, puis à une sédimentation gravitaire de plus en plus réduite en s'éloignant des bordures. Les marnes sus-jacentes correspondent à des dépôts de talus qui soulignent la topographie héritée. Le passage à la sédimentation turbiditique des grès d'Annot s. l. , est corrélé avec le début d'une activité de rift sur le bloc corso-sarde et le changement climatique qui intervient à cette époque. Le dépôt de ces grès dont l'épaisseur maximale observée est de 1 200 m correspond à une phase de remplissage, avec des onlaps bien marqués soulignant les paléopentes. La distension E-O se poursuit durant la sédimentation des grès mais elle s

  5. Modalités d'occupation du territoire et relations humains-grands Carnivores durant le Pléistocène supérieur :Approche archéozoologique, taphonomique et paléoécologique du Bassin mosan dans son contexte nord-ouest européen

    OpenAIRE

    Jimenez, Elodie-Laure

    2017-01-01

    Au sein des territoires du nord-ouest européen, la Belgique et son Bassin mosan ont livré ces 150 dernières années une somme prodigieuse de témoins des populations humaines et animales paléolithiques. Alors que ces vestiges laissent supposer le caractère attractif de la région lors de la dernière glaciation du Pléistocène (115-10 ka BP), ces communautés d’ongulés et leurs prédateurs— humains et grands Carnivores — ont dû toutefois s’adapter à de nombreuses variations environne...

  6. Mise en évidence de Provinces géochimiques dans les schistes bitumeux du Toarcien de l'est du bassin de Paris Geocheminical Provinces Revealed in Toarcien Oil Shales in the Eastern Paris Basin. Analysis of the Soluble Organic Fraction

    Directory of Open Access Journals (Sweden)

    Huc A. Y.

    2006-11-01

    Full Text Available L'étude de la matière organique soluble dans le chloroforme des schistes du Toarcien de la partie orientale du bassin de Paris met en évidence l'existence d'une province géochimique nord et d'une province géochimique sud dont la frontière commune se trouve dans la région de Fécocourt. La province septentrionale se caractérise par une influence du domaine continental (massif des Ardennes au niveau de l'apport organique. Alors que la province méridionale se révèle exempt d'apport terrestre. Ces résultats sont en accord avec les indications sédimentologiques fournies par la littérature et apportent une dimension géochimique à la paléogéographie de ce bassin. An anaalysis of soluble organic motter in the chloroform from Toarcian shales from the eastern part of the Paris Basin reveals the existence of a northern geochemical province and a southern geochemical province whose commun boundary lies in the Fecocourt region. The northern province is characterized by the influence of the continental domain (Ardennes range with regard to organic influx, whereas no terrestrial influx is found in the southern province. These findings agree with the sedimentological indications supplied by the literature and add a geochemical dimension to the paleogeography of this basin.

  7. Utilisation du foncier agricole à des fins de culture de Jatropha dans le Bassin arachidier sénégalais: une démarche controversée et des gains pas à la hauteur des attendus du programme

    Directory of Open Access Journals (Sweden)

    Aminata Ndour

    2017-10-01

    Full Text Available Durant les années 2000, le secteur énergétique mondial a connu un tourment décisif du fait de la diminution des réserves, de la demande importante et surtout de la fluctuation des prix du pétrole. Le Sénégal, pays dépendant encore des énergies fossiles, s’est engagé dans une politique de diversification énergétique. Par conséquent, un programme biocarburant est initié. Le Bassin Arachidier est un des espaces sollicités pour l’application des politiques de promotion des biocarburants. Une zone du production agricole a accueilli une innovation énergétique. Ce fait marquant a guidé nos interrogations sur les problèmes énergétiques qui ont incité la culture de Jatropha dans le Bassin Arachidier. De façon spécifique, notre analyse de la filière Jatropha précise les stratégies déployées. Il est questions dans ce cas d’étudier les effets de Jatropha sur l’espace de production et les conditions de vie des agriculteurs, des risques de réduction des superficies de cultures traditionnelles.

  8. A study of uranium series disequilibrium in core profiles and mineral separates from the samples of Lac du Bonnet granite from the URL site, Pinawa, Manitoba, Canada

    International Nuclear Information System (INIS)

    Ivanovich, M.; Longworth, G.; Wilkins, M.A.; Hasler, S.E.

    1987-12-01

    Uranium series disequilibrium measurements of actinide activities and activity ratios have been used to study the geochemical history of Lac du Bonnet granite, from the URL site, Pinawa, Canada. Measurements on core profiles between fractured surfaces and the parent rock show that the granite underwent high temperature events several million years ago, followed by more recent low temperature events within the last million years. The main locations for the rock/water interaction and exchange of actinides are the fracture surfaces. The results of similar measurements on separated mineral phases show that the 'soft' minerals such as biotite and feldspar are more vulnerable to weathering than the 'hard' accessory minerals such as zircon. (author)

  9. Caractéristiques de la population de Distichodus rostratus Günther, 1864 (pisces: Distichodontidae du lac de barrage de Taabo (bassin du Bandama, Côte d'Ivoire. Implications pour une gestion rationnelle du stock

    Directory of Open Access Journals (Sweden)

    Aliko, NGG.

    2010-01-01

    Full Text Available Population Characteristics of Distichodus rostratus Günther, 1864 (pisces: Distichodontidae in the Taabo Man Made Lake (Bandama Basin, Ivory Coast. Implications for a Rational Management of the Stock. Some characteristics of the fish Distichodus rostratus of Taabo lake were studied in order to establish basis of a rational management of the stock. Specimens were sampled in July, October and December 2006 and March and June 2007. Analyses were about the spatio-temporal dynamic of population sex-ratio, size structure, length-weight relationships and condition factor. The global sex-ratio was in favour of the males (3.5 :1 and presented a seasonal variation. Fish size ranged from 47 to 530 mm SL and there was a significant difference (p< 0.05 between individuals sampled in the superior part (Mean= 183.09 ± 75.10 mm SL of the lake and those sampled in the inferior part (Mean= 110.91 ± 38.30 mm SL. Specimens caught during inflow had length widely higher than those caught during drop in the water level (p< 0.05. The growth of this species appeared positive allometric in almost all the categories (b= 2.98 - 3.33. The condition factor ranged from 0.44 to 5.97 and it was higher for fish collected in the superior part (Mean= 1.92 ± 0.27 than those collected in the inferior one (Mean= 1,64 ± 0.41.

  10. Contribution de la géochimie organique à une esquisse paléoécologique des shistes bitumeux du Toarcien de l'Est du bassin de Paris. Etude de la matière organique insoluble (kérogènes Contribution of Organic Geochemistry to a Paleoecological Sketch of Toarcian Oil Shales in the Eastern Paris Basin. Analysis of Insoluble Organic Matter (Kerogens

    Directory of Open Access Journals (Sweden)

    Huc A. Y.

    2006-11-01

    Full Text Available L'étude des kérogènes des schistes cartons du Toarcien inférieur du bassin de Paris au niveau de l'affleurement oriental (du Luxembourg au Morvan confirme l'homogénéité globale de la matière organique dans cette formation. Il s'agit d'une matière organique d'origine marine autochtone. Cependant l'existence de fluctuations (de faible amplitude répondant à une logique géographique conforte la notion de provinces géochimiques dans ce bassin, telle qu'elle avait été définie à l'occasion de l'étude de la fraction soluble (CHCIsJ. La distinction entre une province nord (Lorraine et une province sud (Avallonais,Haute-Saône, Haute-Marne pourrait être imputable à un apport détritique plus sensible dans la partie septentrionale du bassin et/ou aux conditions de milieu ayant régné au moment du dépôt. The present study of kerogens isolated from early Toorcion shales sompled on the eastern out-trop of the Paris Basin (from Luxembourg to Morvan verifies the overall homogeneity of the organic matter in this formation. This organic matter is of autoch thonous marine origin. However, the occurrence of small variations related to different geogrophical locations reinforces the concept of geochemical provinces in this basin as revealed by a previous analysis of the chloroform extracts. Differences between a northern province (Lorraine and a southern province (Avallon area, Haute-Saône, Haute-Marne could be interpreted as the consequence of a more important detrital input in the northern part of the basin and/or of different environmental conditions at the time of deposition.

  11. Manoomin: place-based research with Native American students on wild rice lakes on the Fond du Lac Band of Lake Superior Chippewa Reservation, northern Minnesota

    Science.gov (United States)

    Ito, E.; Myrbo, A.; Dalbotten, D. M.; Pellerin, H.; Greensky, L.; Howes, T.; Wold, A.; McEathron, M. A.; Shanker, V.

    2010-12-01

    The manoomin project is a collaboration between Fond du Lac Tribal and Community College (Cloquet, MN), the Reservation’s Resource Management Division, and the University of Minnesota funded by the NSF GEO-OEDG Program. It builds on a successful seven-year history of collaboration between these parties, including regular science camps (gidaakiimanaanimigawig, Our Earth Lodge) for students of a wide range of ages. We are working as a team with Native students to study the history of wild rice (manoomin; Zizania palustris), a culturally important resource, growing on Reservation lakes. The joint project takes two main approaches: study of sediment core samples collected from Reservation lakes; and the collection of traditional knowledge about wild rice from the Elders. Science campers collect lake cores during winter with the assistance of the U of MN’s LacCore (National Lacustrine Core Facility) and Resource Management and visit LacCore to log, split and describe cores soon thereafter. Academic mentors with a range of specialties (phytoliths, pollen, plant macrofossils, sedimentology, geochemistry, magnetics) spend 1-2 weeks during the summer with small groups of college-age (>18, many nontraditional) student interns working on a particular paleoenvironmental proxy from the sediment cores. Younger students (middle and high school) also work in small teams in half day units with the same mentors. All campers become comfortable in an academic setting, gain experience working in research labs learning and practicing techniques, and jointly interpret collective results. The continuation of the project over five years (2009-2014) will allow these students to develop relationships with scientists and to receive mentoring beyond the laboratory as they make transitions into 2- and 4-year colleges and into graduate school. Their research provides historical and environmental information that is relevant to their own land that will be used by Resource Management which is

  12. Improving the Terrain-Based Parameter for the Assessment of Snow Redistribution in the Col du Lac Blanc Area and Comparisons with TLS Snow Depth Data

    Science.gov (United States)

    Schön, Peter; Prokop, Alexander; Naaim-Bouvet, Florence; Nishimura, Kouichi; Vionnet, Vincent; Guyomarc'h, Gilbert

    2014-05-01

    Wind and the associated snow drift are dominating factors determining the snow distribution and accumulation in alpine areas, resulting in a high spatial variability of snow depth that is difficult to evaluate and quantify. The terrain-based parameter Sx characterizes the degree of shelter or exposure of a grid point provided by the upwind terrain, without the computational complexity of numerical wind field models. The parameter has shown to qualitatively predict snow redistribution with good reproduction of spatial patterns, but has failed to quantitatively describe the snow redistribution, and correlations with measured snow heights were poor. The objective of our research was to a) identify the sources of poor correlations between predicted and measured snow re-distribution and b) improve the parameters ability to qualitatively and quantitatively describe snow redistribution in our research area, the Col du Lac Blanc in the French Alps. The area is at an elevation of 2700 m and particularly suited for our study due to its constant wind direction and the availability of data from a meteorological station. Our work focused on areas with terrain edges of approximately 10 m height, and we worked with 1-2 m resolution digital terrain and snow surface data. We first compared the results of the terrain-based parameter calculations to measured snow-depths, obtained by high-accuracy terrestrial laser scan measurements. The results were similar to previous studies: The parameter was able to reproduce observed patterns in snow distribution, but regression analyses showed poor correlations between terrain-based parameter and measured snow-depths. We demonstrate how the correlations between measured and calculated snow heights improve if the parameter is calculated based on a snow surface model instead of a digital terrain model. We show how changing the parameter's search distance and how raster re-sampling and raster smoothing improve the results. To improve the parameter

  13. Merging a Terrain-Based Parameter and Snow Particle Counter Data for the Assessment of Snow Redistribution in the Col du Lac Blanc Area

    Science.gov (United States)

    Schön, Peter; Prokop, Alexander; Naaim-Bouvet, Florence; Vionnet, Vincent; Guyomarc'h, Gilbert; Heiser, Micha; Nishimura, Kouichi

    2015-04-01

    Wind and the associated snow drift are dominating factors determining the snow distribution and accumulation in alpine areas, resulting in a high spatial variability of snow depth that is difficult to evaluate and quantify. The terrain-based parameter Sx characterizes the degree of shelter or exposure of a grid point provided by the upwind terrain, without the computational complexity of numerical wind field models. The parameter has shown to qualitatively predict snow redistribution with good reproduction of spatial patterns. It does not, however, provide a quantitative estimate of changes in snow depths. The objective of our research was to introduce a new parameter to quantify changes in snow depths in our research area, the Col du Lac Blanc in the French Alps. The area is at an elevation of 2700 m and particularly suited for our study due to its consistently bi-modal wind directions. Our work focused on two pronounced, approximately 10 m high terrain breaks, and we worked with 1 m resolution digital snow surface models (DSM). The DSM and measured changes in snow depths were obtained with high-accuracy terrestrial laser scan (TLS) measurements. First we calculated the terrain-based parameter Sx on a digital snow surface model and correlated Sx with measured changes in snow-depths (Δ SH). Results showed that Δ SH can be approximated by Δ SHestimated = α * Sx, where α is a newly introduced parameter. The parameter α has shown to be linked to the amount of snow deposited influenced by blowing snow flux. At the Col du Lac Blanc test side, blowing snow flux is recorded with snow particle counters (SPC). Snow flux is the number of drifting snow particles per time and area. Hence, the SPC provide data about the duration and intensity of drifting snow events, two important factors not accounted for by the terrain parameter Sx. We analyse how the SPC snow flux data can be used to estimate the magnitude of the new variable parameter α . To simulate the development

  14. Geopressure and Trap Integrity Predictions from 3-D Seismic Data: Case Study of the Greater Ughelli Depobelt, Niger Delta Pressions de pores et prévisions de l’intégrité des couvertures à partir de données sismiques 3D : le cas du grand sous-bassin d’Ughelli, Delta du Niger

    Directory of Open Access Journals (Sweden)

    Opara A.I.

    2012-05-01

    Full Text Available The deep drilling campaign in the Niger Delta has demonstrated the need for a detailed geopressure and trap integrity (drilling margin analysis as an integral and required step in prospect appraisal. Pre-drill pore pressure prediction from 3-D seismic data was carried out in the Greater Ughelli depobelt, Niger Delta basin to predict subsurface pressure regimes and further applied in the determination of hydrocarbon column height, reservoir continuity, fault seal and trap integrity. Results revealed that geopressured sedimentary formations are common within the more prolific deeper hydrocarbon reserves in the Niger Delta basin. The depth to top of mild geopressure (0.60 psi/ft ranges from about 10 000 ftss to over 30 000 ftss. The distribution of geopressures shows a well defined trend with depth to top of geopressures increasing towards the central part of the basin. This variation in the depth of top of geopressures in the area is believed to be related to faulting and shale diapirism, with top of geopressures becoming shallow with shale diapirism and deep with sedimentation. Post-depositional faulting is believed to have controlled the configuration of the geopressure surface and has played later roles in modifying the present day depth to top of geopressures. In general, geopressure in this area is often associated with simple rollover structures bounded by growth faults, especially at the hanging walls, while hydrostatic pressures were observed in areas with k-faults and collapsed crested structures. Les campagnes de forages profonds dans le delta du Niger ont démontré la nécessité d’une analyse détaillée des surpressions et de l’intégrité des structures pour évaluer correctement les prospects. La prédiction des pressions interstitielles a pu être réalisée ici avant forage à partir de données sismiques 3-D du grand sous-bassin d’Ughelli, dans le delta du Niger. Ce travail a permis de prévoir les régimes de pression du

  15. Gestion de l'eau de consommation et de la pollution dans le bassin ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Gestion de l'eau de consommation et de la pollution dans le bassin versant de Yitenga, Burkina Faso - Phase II. La première phase de ce projet, 102474 Collectif de praticiens en écosanté (Afrique subsaharienne), portait sur l'étude des risques de maladies diarrhéiques ou leur recrudescence dans la zone du bassin ...

  16. A study of small-scale foliation in lengths of core enclosing fault zones in borehole WD-3, Permit Area D, Lac du Bonnet Batholith

    Energy Technology Data Exchange (ETDEWEB)

    Ejeckam, R. B.

    1992-12-01

    Small-scale foliation measurements in lengths of core from borehole WD-3 of Permit Area D of the Lac du Bonnet Batholith have defined five major mean orientation sets. They strike NW, N and NE. The orientations (strike to the left of the dip direction/dip) of these sets are as follows: Set I - 028/74 deg; II - 001/66 deg; III - 100/58 deg; IV - 076/83 deg; and V - 210/40 deg. The small-scale foliations were defined by different mineral types such as biotite crystals, plagioclase, mineral banding and quartz lenses. Well-developed biotite foliation is commonly present whenever well-developed plagioclase foliation exists, but as the strength of development weakens, the preferred orientations of plagioclase foliation do not correspond to those of biotite. It is also noted that the foliations appear to strike in directions orthogonal to the fractures in the fracture zones in the same depth interval. No significant change in foliation orientation was observed in Zones I to IV. Set V, however, whose mean orientation is 210/40 deg, is absent from the Zone IV interval, ranging from 872 to 905 m. (auth)

  17. Past and future fracturing in AECL Research areas in the superior province of the Canadian Precambrian Shield, with emphasis on the Lac du Bonnet Batholith

    Energy Technology Data Exchange (ETDEWEB)

    Brown, A; Everitt, R A; Martin, C D; Davison, C C [Atomic Energy of Canada Ltd., Pinawa, MB (Canada). Whiteshell Labs.

    1995-10-01

    The likelihood that future fracturing, arising from geologic causes, could occur in the vicinity of a nuclear fuel waste repository in plutonic rock of the Canadian Precambrian Shield, is examined. The report discusses the possible causes of fracturing (both past and future) in Shield rocks. The report then examines case histories of fracture formation in Precambrian plutonic rocks in AECL`s Research Areas, especially the history of the Lac du Bonnet Batholith, in the Whiteshell Area, Manitoba. Initially, fractures can be introduced into intrusive plutonic rocks during crystallization and cooling of an intrusive magma. These fractures are found at all size scales; as late residual magma dyking, hydraulic fracturing by retrograde boiling off of hydrothermal fluids, and, in some cases, through local differential cooling. Subsequent fracturing is largely caused by changes in environmental temperature and stress field, rather than by alteration of the material behaviour of the rock. Pluton emplacement during orogeny is commonly accompanied by uplift and erosional exhumation, altering both the tectonic and the lithostatic stresses, the rock temperature gradient and the pore fluid characteristics.

  18. Past and future fracturing in AECL Research areas in the superior province of the Canadian Precambrian Shield, with emphasis on the Lac du Bonnet Batholith

    International Nuclear Information System (INIS)

    Brown, A.; Everitt, R.A.; Martin, C.D.; Davison, C.C.

    1995-10-01

    The likelihood that future fracturing, arising from geologic causes, could occur in the vicinity of a nuclear fuel waste repository in plutonic rock of the Canadian Precambrian Shield, is examined. The report discusses the possible causes of fracturing (both past and future) in Shield rocks. The report then examines case histories of fracture formation in Precambrian plutonic rocks in AECL's Research Areas, especially the history of the Lac du Bonnet Batholith, in the Whiteshell Area, Manitoba. Initially, fractures can be introduced into intrusive plutonic rocks during crystallization and cooling of an intrusive magma. These fractures are found at all size scales; as late residual magma dyking, hydraulic fracturing by retrograde boiling off of hydrothermal fluids, and, in some cases, through local differential cooling. Subsequent fracturing is largely caused by changes in environmental temperature and stress field, rather than by alteration of the material behaviour of the rock. Pluton emplacement during orogeny is commonly accompanied by uplift and erosional exhumation, altering both the tectonic and the lithostatic stresses, the rock temperature gradient and the pore fluid characteristics

  19. Le black-bass (Micropterus salmoides Lacép. dans les eaux italiennes. Un antagoniste du brochet ?

    Directory of Open Access Journals (Sweden)

    ALESSIO G.

    1984-01-01

    Full Text Available Le black-bass à grande bouche est largement répandu dans les eaux italiennes et fait l'objet de repeuplement. Les alevins et estivaux nécessaires proviennent le plus souvent de la vidange automnale des étangs à cyprinidés avec lesquels ils sont élevés. Il n'y a pas vraiment d'élevage contrôlé de cette espèce en Italie, mais seulement une série d'essais qui portent sur la reproduction naturelle en étangs-frayères, l'introduction de nids artificiels dans le milieu et l'induction de la ponte par traitement hypophysaire (avec HCG, essais qui donnent des résultats satisfaisants. Dans le milieu naturel, la croissance en longueur et en poids du black-bass en Italie est comparable et quelquefois meilleure que celle enregistrée sur ses lieux d'origine. La croissance annuelle est d'abord lente (printemps, puis rapide (été, ensuite à nouveau lente (automne pour être finalement modeste ou pratiquement nulle en hiver. La population qui, avec des fluctuations annuelles, représente 0,5 à 1,6 % de l'ichthyofaune des eaux étudiées (fleuves Pô, Sesia et Ticino, est constituée surtout de sujets jeunes : environ 40 % des individus sont âgés de 2 hivers et ne dépassent pas un poids de 400 g et une longueur totale de 28 cm. La survie est considérée comme bonne avec une durée de vie de 8 à 9 hivers. La nourriture présente un spectre très large et est basée de préférence sur des petits poissons et sur les amphibiens, avec une large partie d'invertébrés (surtout des insectes. La reproduction intervient aux mois de mai et juin, mais elle peut être aussi plus précoce et, le plus souvent, plus tardive. Le black-bass est très sensible aux pollutions, mais ne semble pas particulièrement affecté par des épizooties ou du parasitisme. Par rapport à la niche écologique occupée, à son spectre trophique, à son rôle dans les équilibres biologiques et à ses caractéristiques éthologiques, le black-bass ne peut pas être consid

  20. Les affaissements miniers dans le bassin ferrifère lorrain : quand le territoire re-politise la gestion du risque

    Directory of Open Access Journals (Sweden)

    François Duchêne

    2008-10-01

    Full Text Available Avec la fin de l’extraction et la vente des cités minières, les affaissements miniers, de risques liés au travail se sont transformés en risques environnementaux. Les dégâts miniers étaient traités jusque-là en interne par les exploitants, et ils sont donc devenus une affaire des services de l’Etat lors de la remise des concessions minières. Ce transfert a été particulièrement vif dans le bassin ferrifère lorrain, aux couches peu profondes et donc plus propice que d’autres aux phénomènes d’affaissement. Les réactions locales à ces effondrements ont été d’autant plus virulentes qu’elles touchaient un territoire en crise. Les services de l’Etat ont avant tout cherché à apporter des réponses techniques et sectorielles pour prévenir les risques. Or les affaissements ont fait bouger bien plus que les maisons. Ils ont mis en mouvement des acteurs locaux issus d’une histoire politique, économique et sociale née des mines et de la sidérurgie et meurtries par la désindustrialisation. Au final, c’est précisément parce qu’il y avait un contexte territorial spécifique, avec la mobilisation de forces sociales encore chargées d’une histoire toute proche, qu’une dimension politique s’est imposée dans la gestion et le traitement de ces risques.With the end of mining activity and the sale of miners’ dwellings, the question of subsidence, hitherto an industrial hazard, became an environmental risk. The damage caused by mining, an issue previously addressed privately by the owners, became the responsibility of government services when mining concessions were handed over to the State. The handover was particularly delicate in the iron-ore basin of Lorraine, where the closeness of the ore to the surface made this area more liable to subsidence than others. Local reactions to the phenomenon were all the more heated as the territory was already in the throes of an economic crisis. The solutions sought by

  1. Cartographie numérique en géologie de surface. Application aux altérites à silex de l'Ouest du bassin de Paris

    OpenAIRE

    Quesnel , Florence

    1997-01-01

    Thèse publiée. Document du BRGM, 263, 268 p et 160 p d'annexes.; The compilation of data from 50 geological maps (1:50,000 scale), 2,500 boreholes and their combination in the creation of thematic maps using G.I.S. software, has enabled the anatomy of the flint alterites (termed RS, residu à silex or "clay-with-flints") of the western Paris Basin to be established. Geostatistical treatment of the thickness variable of superficial plateau formations (RS + plateau loams + Cenozoic residuals) an...

  2. Protection et valorisation du patrimoine géomorphologique en Île- de-France (Bassin de Paris, France)État des lieux et perspectives

    OpenAIRE

    Bétard, François

    2015-01-01

    Reconnu depuis une dizaine d’années seulement, le patrimoine géomorphologique fait l’objet d’une attention accrue de la part des scientifiques et des acteurs du territoire, en raison des menaces grandissantes qui pèsent sur la préservation des reliefs et des paysages, mais aussi compte tenu des potentialités qu’offre la valorisation culturelle et touristique des sites d’intérêt géomorphologique (ou géomorphosites) pour le développement local. En France métropolitaine, la région Île-de-France ...

  3. REPEUPLEMENTS EN ALEVINS NOURRIS ET DÉMOGRAPHIE DE LA POPULATION DE TRUITE (SALMO TRUTTA L. DANS LE REDON, UN AFFLUENT DU LAC LÉMAN INTERROMPU PAR UN OBSTACLE

    Directory of Open Access Journals (Sweden)

    CHAMPIGNEULLE A.

    2003-01-01

    Full Text Available La démographie d’une population de truite (Salmo trutta L. a été étudiée, dans un contexte de repeuplements en alevins nourris, sur le Redon, un affluent du lac Léman. On trouve sur le Redon une situation typique de nombreux affluents du Léman : une zone aval ouverte sur le lac mais rapidement interrompue par un obstacle empêchant la remontée des truites de lac. Des relâchers d’alevins nourris issus d’œufs de géniteurs sauvages de truite de lac ou de géniteurs domestiques, pratiqués en fin de printemps-début été à des densités de 40-60 ind./100 m2, fournissent un recrutement additionnel important pouvant constituer la part dominante du peuplement automnal en 0 +, puis 1 +. Sur les zones ouvertes à la pêche, colonisées ou non par la truite de lac, la densité de la population automnale en place s’effondre entre le stade 1 + et les stades > 1 +. Les résultats comparatifs entre zones ouvertes ou fermées à la pêche indiquent que la pêche peut être un facteur de mortalité important. La dynamique comparée des truites d’origine lacustre ou sédentaire suggère l’existence d’un taux de sédentarisation plus faible pour les 1 + issus de truites de lac comparativement aux 1 + issus de la fraie de truites sédentaires en zone de réserve. Une expérimentation suggère l’existence de mouvements de dévalaison ayant lieu avant octobre et touchant préférentiellement les 0 + d’origine lacustre ayant eu la croissance initiale la plus forte. L’étude montre que : - des alevins nourris d’origine lacustre ou domestique, relâchés en fin de printemps-début été, fournissent des géniteurs de truite de lac remontant dans la rivière de relâcher, avec cependant une proportion moindre (4 fois dans le cas de l’origine domestique comparativement à l’origine lacustre. Malgré leur forte contribution aux stades de juvéniles 0 + et 1 +, les alevins domestiques de pisciculture contribuent peu aux retours de g

  4. A 400-year phytolith-based reconstruction of wild rice (Zizania palustris) abundance from Mud Lake core sediments, Fond du Lac Band of Lake Superior Chippewa Reservation, Minnesota, USA.

    Science.gov (United States)

    Munoz, R.; Caylor, E.; Yost, C. L.; Drake, C.; Ladwig, J. L.; Myrbo, A.; Howes, T.

    2014-12-01

    Wild rice (Zizania palustris L.) is an aquatic grass with spiritual and subsistence significance to Native people of the Great Lakes region of North America. Mud Lake (Mashkiigwaagamaag), located on the Fond du Lac Band of Lake Superior Chippewa Reservation in Carlton County, Minnesota, USA, once supported an extensive population of wild rice (manoomin). However, early 20th century attempts to ditch and drain surrounding wetlands for landuse intensification severely altered the natural hydrological system that supports wild rice. Fond du Lac Resource Management (FDLRM) technicians are currently working to increase the wild rice population in Mud Lake. As part of these efforts, this phytolith study was undertaken to better understand how wild rice abundance has fluctuated over the past 400 years, with particular emphasis on the 19th and 20th centuries. Phytoliths are microscopic opal silica plant remains that are incorporated into soils and lake sediments after the plant-parts that contain them decay. Wild rice produces phytolith morphotypes that are unequivocally diagnostic. Mud Lake core MNMN-MUD11-1C-1P-1 (46°43'38.39"N, 92°42'2.45"W) was piston cored by LacCore (National Lacustrine Core Facility) and FDLRM technicians on 24 May 2011. Initial core descriptions, multi-sensor core logging, phytolith sampling and phytolith extractions were completed during the summer of 2014 at LacCore. Wild rice phytolith identification and quantification was conducted on twelve samples using brightfield microscopy at 400x magnification. Wild rice phytolith concentration values ranged from 68 to 2,300 phytoliths/cm3. Wild rice accumulation rates ranged from 9 to 383 phytoliths/ cm2/yr, peaking in 1952 AD. Wild rice abundance in Mud Lake appears to be influenced by a complex set of variables that include anthropogenic disturbance, climatic events and aquatic plant community succession.

  5. Diffusion Properties of Carbonated Caprocks from the Paris Basin Propriétés diffusives de roches de couverture carbonatées du Bassin de Paris

    Directory of Open Access Journals (Sweden)

    Berne P.

    2009-11-01

    carbonated caprocks (regardless of the problem of alteration by acidified water, not addressed here. Lastly, a few simple rules for extending the results presented here to other experimental conditions are proposed. L’efficacite d’un stockage geologique de CO2 repose sur les proprietes de confinement des roches de couverture. Parmi ces proprietes, les caracteristiques diffusives jouent un role important qui est parfois sous-estime. En effet, la diffusion est un processus lent mais qui peut s’averer non negligeable sur le long terme. De plus, les caracteristiques recherchees pour une roche de couverture, principalement une forte pression d’entree et une faible permeabilite, ne sont pas incompatibles avec des coefficients de diffusion relativement eleves, puisque ces grandeurs sont liees a des caracteristiques geometriques differentes (schematiquement, les tailles de pore pour les unes et la tortuosite pour les autres. Dans le cadre du projet Geocarbone–INTEGRITE, finance par l’ANR de 2006 a 2008, on a donc mesure les coefficients de diffusion de l’eau et de l’ion bicarbonate dans des echantillons de roche de couvertures carbonatees provenant de trois niveaux (formations des Calcaires du Comblanchien et de la Dalle Nacree. Ces deux especes permettent en effet de couvrir, en premiere approximation, les situations rencontrees en conditions de stockage (espece neutre/espece chargee, interagissant ou non avec la matrice solide. Dans un premier temps, on presente le modele simple de diffusion utilise pour le depouillement des experiences, ce qui permet de passer en revue les differentes grandeurs utiles : coefficient de diffusion effectif, coefficient de diffusion de pore, coefficient de diffusion apparent, porosite accessible, facteur de retard. Le coefficient d’autodiffusion de l’eau est mesure par deux techniques differentes (Resonance Magnetique Nucleaire et tracage radioactif a l’eau tritiee 1H3HO dans deux echantillons. Les resultats obtenus sont

  6. Petrophysical Properties of the Middle Jurassic Carbonates in the PICOREF Sector (South Champagne, Paris Basin, France Propriétés pétrophysiques du Dogger carbonaté dans le Secteur PICOREF (Sud Champagne, bassin de Paris, France

    Directory of Open Access Journals (Sweden)

    Delmas J.

    2010-05-01

    Full Text Available This article, carried out as part of the PICOREF Project for the CO2 storage in the aquifers of the Paris Basin, presents an important petrophysical database from the numerous petroleum wells drilled in the PICOREF Sector (south-eastern part of the Paris Basin between 1953 and 2001. These core data concern the three saline carbonated aquifers of the Middle Jurassic: the Oolithe Blanche and the Comblanchien formations, Upper Bathonian age, and the Dalle Nacrée formation, Lower Callovian age, that would be used for the CO2 sequestration. Located at –1230 to –1750 m sub sea in the studied sector, these carbonate reservoirs which cumulative thickness is about 150 m, outcrop in the Burgundy region, at about 80 km south-eastern the Sector where they are exploited in several quarries. The analysis of the 6800 routine measurements (porosity and permeability gathered for this study allowed to improve the knowledge of the petrophysical properties. Special measurements (mercury injection tests allowed to characterize the porous medium. Cet article, réalisé dans le cadre du Projet PICOREF(1 pour le stockage de CO2 dans les aquifères du bassin parisien, présente une importante base de données pétrophysiques issues des nombreux puits pétroliers forés dans le Secteur PICOREF (sud-est du bassin parisien entre 1953 et 2001. Ces données concernent les trois aquifères salins du Dogger carbonaté susceptibles d’être utilisés pour séquestrer du CO2 : l’Oolithe Blanche et le Comblanchien, d’âge Bathonien supérieur, ainsi que la Dalle Nacrée d’âge Callovien inférieur. Recoupés à des altitudes de – 1230 à – 1750 m/mer dans le secteur étudié, ces réservoirs carbonatés, dont l’épaisseur cumulée est de 150 m environ, affleurent en Bourgogne, à 80 km au sud-est du « Secteur », où ils sont exploités dans plusieurs carrières. L’analyse des 6800 mesures classiques (porosité et perméabilité rassemblées ici a permis d

  7. Ecologie du phytoplancton du lac Kivu

    Directory of Open Access Journals (Sweden)

    Sarmento, H.

    2009-01-01

    Full Text Available Microbiological, Biochemical and Genetic Potential of Freeze Dried Starter Cultures of Acetic Acid Bacteria Isolated from Tropical Products Found in Sub-Saharan Africa and Intended for Use in the Production of Vinegar. The International Assessment of Agricultural Science and Technology for Development (IAASTD is a unique international effort that evaluates the relevance, quality and effectiveness of agricultural knowledge, science, and technology (AKST, the effectiveness of public and private sector policies as well as institutional arrangements in relation to AKST. The purpose of IAASTD is to assess the impact of AKST on hunger, poverty, nutrition, human health, and environmental and social sustainability, in order to formulate options for actions to use AKST more effectively to facilitate sustainable development. The IAASTD report concludes that business as usual is not an option, successfully meeting development and sustainability goals and responding to new priorities and changing circumstances would require a fundamental shift in agricultural knowledge, science, and technology.

  8. Gouvernance communautaire des milieux humides du bassin ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    South Africa). The community of Craigieburn in KwaZulu-Natal, South Africa, is located on a 1 200-ha wetland that plays an important role in the regulation and maintenance of the Sand River. View moreCommunity Based Governance of ...

  9. Analyse séquentielle de l'Eocène et de l'Oligocène du bassin Parisien (France Sequence Analysis of the Eocene-Oligocene Paris Basin, France

    Directory of Open Access Journals (Sweden)

    Gely J. P.

    2006-11-01

    Full Text Available Dans le Bassin parisien pendant l'Eocène et l'Oligocène, on dénombre vingt-deux discontinuités issues d'émersions correspondant aux périodes de bas-niveaux marins. La présence de fleuves est décelée dans les prismes de bordure de plate-forme et dans les prismes de haut niveau, remobilisant des stocks sableux anciens à partir des anticlinaux actifs et des bordures du bassin. Ainsi, indépendamment du volume disponible pour les sédiments, se succèdent des séquences dominées soit par des formations détritiques, soit par des formations carbonatées. La plate-forme parisienne a enregistré toutes les variations eustatiques connues, bien que les mouvements tectoniques syn-sédimentaires locaux puissent influencer fortement les conditions de sédimentation. Mieux encore, la plate-forme parisienne a subi des fluctuations marines d'ordre supérieur de très courte durée qui, si elles sont retrouvées dans d'autres domaines, pourront être attribuées à des phénomènes eustatiques. The Paris Basin (Map 1 is a classic example of a stable platform such as has been known throughout the World for a long time now. Aside from the Bartonian and Priabonian, all Eocene and Oligocene stages have been defined in the form of the following four international stratotypes : Sparnacian, Cuisian, Lutetian and Stampian. It should also be noted that the substages of the Bartonian (Auversian, marinesian and the Ludian, the equivalent of the Priabonian, are also Parisian. Even though gaps have recently been redefined (C. Pomerol, 1989, though the correlations between the different formations in the basin and those of the surrounding areas (D. Curry, 1967; et al. 1969, 1978; C. Pomerol, 1977; C. Cavelier, 1979; C. Cavelier and C. Pomerol, 1986 have now been determined, and though the worldwide eustatic sea level curve was partly plotted with the help of stratotype sections (B. U. Haq et al. , 1988, the Eocene and Oligocene sequence analysis of the paris Basin

  10. Observations préliminaires sur la répartition et les fluctuations de l'ichtyomasse exploitable dans les différentes zones écologiques du lac Ihema (bassin moyen de l'Akagera, Rwanda

    Directory of Open Access Journals (Sweden)

    Mughanda, M.

    1988-01-01

    Full Text Available Preliminary considerations on distribution and changes in fishable ichtyomass in the ecological areas of lake Ihema (Akagera middle, Foodplain, Rwanda. Since 1981, commercial fishing is accomplished in lake Ihema with gillnets of 50 mm meshes and a mean of 175 tons of fish was caught per year during the first three years. Simultaneously, experimental fishing was introduced since 1982, for which ten gillnets of different meshes are used. Fishes of the two general Tilapia and Clarias are captured in commercial fishing, but in experimental one, about ten taxons of fish are caught. For this paper, we examined statistics obtained from experimental catches during 1982 and 1983. Apart from Tilapia and Clarias, small Cichlidae of Haplochromis group, two species of Mormyridae and Synodontis spp represent a potential which may be exploited with other kinds of gear. Concerning productiveness of fishing areas in lake Ihema, littoral zones (= inshore are more rich than pelagic (= offshore ones and the northern sector in which Akagera river enters the lake is the most productive. Species of fish are differently represented in ecological zones, following the kind of their food (planctonophagous, detritivorous or carnivorous and the places they can reproduce. Catches fluctuate monthly and annually probably because of natural changes in fish stock according to fluctuations of climatic conditions, but also because of increasing intensity of commercial fishing. For Tilapia, reduction in the quantity captured may also be due to introgressive hybridization and competition between T. macrochir, T. nilotica and their hybrids.

  11. République de Djibouti : lac Assal [بحيرة عسل

    OpenAIRE

    Pouyllau , Stéphane

    2009-01-01

    Vue des berges sud-est du lac Assal (République de Djibouti) le 11 novembre 2009. Le Lac Assal est un lac salé endoréique situé au fond du golfe du Ghoubbet-el-Kharab. D'une superficie de 54 km2 et fermé de la mer par le volcan Ardoukôba, sont altitude est de -153m sous le niveau de la mer.

  12. Copépodes, Cladocères et Rotifères du lac Sidi M'hamed Benali (Algérie Nord-Occidentale

    Directory of Open Access Journals (Sweden)

    Mohamed Ali Bouzidi

    2010-03-01

    Full Text Available En 2008, 33 espèces de Cladocères, Copépodes et Rotifères ont été observées dans le lac Sidi M'hamed Benali (contre 12 seulement en 1992.Les Copépodes dominent en mars, avril, juillet, août et septembre, avec respectivement des dominances (Do égales à : 56,6 %, 55,0 %, 55,0 %, 46,4 % et 90,0 %. Les Cladocères dominent en février (Do = 37,2 %, mai (Do = 47,4 % et décembre (Do = 48,6 %. Les Rotifères sont extrêmement abondants et présentent une large dominance en janvier (Do = 95,3 %. La population zooplanctonique est très faible en juillet et en août. Au cours de l'année le peuplement varie en fonction de la température, des conditions hydrologiques, de l'abondance de la nourriture et de la prédation par les poissons.In 2008, 33 species of Cladocers, Copepods and Rotifers have been observed in Sidi M’hamed Benali Lake (against only 12 species in 1992. The Copepods dominate in March, April, July, August and September, respectively with dominance (Do equal to 56.6 %, 55.0 %, 55.0 %, 46.4 % and 90.0 %. Cladocers dominated in February (Do = 37.2 %, May (Do = 47.4 % and December (Do = 48.6 %. The rotifers are extremely abundant and have a wide dominance in January (Do = 95.3%. The zooplankton population is very low in July and August. During the year, the population varies with temperature, water conditions, abundance of food and predation by fishes.

  13. Etude et gestion des impacts hydrogéomorphologiques de la périurbanisation. L'exemple du bassin de l'Yzeron dans l'Ouest lyonnais

    OpenAIRE

    Grospretre, Loic

    2011-01-01

    The Yzeron basin (147 km²) consists of three major units: 1) in the west, the Monts du Lyonnais, a subdued mountain whose land is predominantly rural; 2) in the center, the Plateau Lyonnais, a plateau over a large part of which extends the current periurban belt of Lyon; 3) in the east, the paleovalley of the Rhône and Saône Rivers, most of which is occupied by a dense urbanization. Many incisions have been identified using field indicators and downstream hydraulic geometry relationships (spa...

  14. Étude anatomique d'une espèce de lémurien (Eulemur fulvus) : coupes topographiques et tomodensitométriques du thorax, de l'abdomen et du bassin. Application à la pratique de l'échographie du cœur et des reins

    OpenAIRE

    Raharison, Fidiniaina

    2008-01-01

    L'objectif de notre étude est d'élaborer un document de référence mettant en relation l'anatomie, l'imagerie et la clinique du lémurien brun (Eulemur fulvus) et débouchant sur des mesures échographiques normales des reins et du cœur. Les études anatomique et tomodensitométrique ont été effectuées sur deux lémuriens et l'étude échographique sous différents modes sur 16 animaux après anesthésie. Les coupes anatomiques et tomodensitométriques nous ont permis de préciser la position et la conform...

  15. Histoire et sociétés du Vietnam classique

    OpenAIRE

    Papin, Philippe

    2012-01-01

    Programme de l’année 2008-2009 : I. Histoire rurale de la propriété foncière au Vietnam du XVIe au XVIIIe siècle. — II. Étude des sources de l’histoire villageoise du bassin du fleuve Rouge à l’époque moderne.

  16. L'Escarpement de Malte, le mont Alfeo et les monts de Médine: marges anciennes du bassin Ionien (synthèse des données des campagnes a la mer Escarmed Malta Escarpment, Alfeo and Medina Seamounts: Former Margins of the Ionian Basin

    Directory of Open Access Journals (Sweden)

    Groupe Escarmed

    2006-11-01

    Full Text Available Le Comité d'Etudes Pétrolières Marines (CEPM et le Centre National pour l'Exploitation des Océans (CNEXO ont mené une série d'études sous-marines des escarpements ioniens pour en définir l'origine, l'âge et l'évolution. Les résultats présentés ici concernent l'escarpement de Malte, le mont Alfeo et les monts de Médine à l'ouest et au sud-ouest du bassin Ionien profond. Ils comprennent les données bathymétriques sous forme d'une carte à 1/100 000 hors texte, l'analyse morphologique des reliefs, les déterminations stratigraphiques effectuées sur les échantillons récoltés en dragages, carottages ou en plongées, l'analyse structurale à partir de profils de sismique réflexion et des plongées, et l'étude de la subsidence depuis le Trias supérieur à partir des forages réels du plateau maltais et des forages fictifs du rebord de l'escarpement de Malte. Les conclusions font ressortir : - l'existence de séries carbonatées de plate-forme d'âge Jurassique inférieur pour l'escarpement de Malte et le mont Alfeo, et Crétacé inférieur pour les monts de Médine; - un changement paléogéographique majeur : à partir du Jurassique supérieur pour l'escarpement de Malte et à partir de l'Albien pour ceux de Médine; - l'existence de séries condensées à dater de ce changement paléogéographique et d'une érosion constante jusqu'à l'Actuel, érosion dont les processus variés ont de nombreuses conséquences sur la sédimentation de tels reliefs; - quatre phases de subsidence essentielles : Jurassique moyen, limite Crétacé inférieur-Crétacé supérieur, Miocène inférieur et moyen, Plio-Quaternaire. La parenté du mont Alfeo avec l'escarpement de Malte a été bien reconnue, par contre, les monts de Médine ne semblent se rattacher à leur histoire qu'à partir du Crétacé supérieur et ont sans doute une évolution comparable au plateau cyrénien. Ces escarpements, comme les autres escarpements ioniens, doivent leurs

  17. Application of resistivity measurements to research on structural elements in the Nord-Limousin (France) uraniferous basin (1960); Application des mesures de resistivite a la recherche des elements structuraux dans le bassin uranifere du Nord-Limousin (France) (1960)

    Energy Technology Data Exchange (ETDEWEB)

    Sarcia, J A; Bonnet, J; Combe, R [Commissariat a l' Energie Atomique, Saclay (France).Centre d' Etudes Nucleaires

    1960-07-01

    The authors discuss the difficulties encountered in the exploration of a typical deposit in the Nord-Limousin, using the resistivity measurement method. In the zone in question the over-thrust was very variable and difficult to predict. The uraniferous deposits had two types of aspect, the passage from one to the other being often very sudden: long thin veins without gangue; short and thick lens-shape deposits which were strongly contaminated by clay towards their edges. After several unsatisfactory attempts, the device known as the 'rectangular map' was adopted and gave an acceptable structural representation rapidly and cheaply. For the placing of the probes however, methods are required which are more refined and sensitive. It is in any case useless to expect to obtain a satisfactory representation and a sufficient accuracy using a single technique; especially in the region under consideration. (author) [French] Les auteurs exposent les difficultes rencontrees pour l'exploration, par la methode des mesures de resistivite, d'un gisement type du Nord-Limousin: il s'agissait d'une zone a recouvrement tres variable et difficilement previsible. Les occurences uraniferes y affectaient deux facies passant brutalement de l'un a l'autre: longs filonnets minces et sans gangue; lentilles courtes et puissantes avec alteration argileuses tres etendue aux epontes. Apres plusieurs essais peu satisfaisants, le dispositif dit 'carte des rectangles' a ete adopte pour obtenir rapidement et a bon compte un schema structural suffisant. Mais des methodes plus fines et plus sensibles sont necessaires pour guider l'implantation des sondages. Il est d'ailleurs vain d'esperer trouver a la fois la representativite d'ensemble et la precision, dans l'utilisation d'une seule technique, surtout dans la region envisagee. (auteur)

  18. Perception et gestion de l’érosion et des ressources en eau par les agriculteurs et les éleveurs du bassin versant de l’ibicuí (RS, Brésil

    Directory of Open Access Journals (Sweden)

    Rosa Vieira Medeiros

    2008-01-01

    governo. As entrevistas mostram finalmente, que uma melhor gestão dos riscos ambientais passará por uma boa consideração do universo técnico e cultural dos agricultores assim como de suas dificuldades econômicas.L’ouest du Rio Grande do Sul est dominé par la culture du soja, du riz et par l’élevage bovin. Dans la partie sableuse, le milieu est affecté par des phénomènes d’érosion produisant des modelés éoliens spectaculaires (arenização rappelant dans l’imaginaire ceux des déserts. La production agricole est importante ce qui engendre des prélèvements d’eau pour l’irrigation du riz, mais aussi l’utilisation de pesticides pour l’ensemble des cultures. La gestion durable des ressources en eau et en sol de cette région nécessite la mise en place d’action de conservation. Mais un certain nombre de questions se posent alors : comment les agriculteurs perçoivent ces phénomènes ? Constituent-ils pour eux des enjeux ? Comment raisonnent-ils leurs pratiques ? Avec quels réseaux ? Quelles sont les interactions avec les pouvoirs publics ?La méthodologie adoptée s’appuie sur des enquêtes ouvertes réalisées auprès de 23 agriculteurs. Il s’agit de mieux comprendre leur perception de l’environnement, leurs modes de gestion et d’identifier les variables sociales au sein de l’échantillon expliquant des différences de comportement.Les résultats que nous avons obtenus montrent que peu d’agriculteurs perçoivent leurs responsabilités quant à l’érosion des sols et à l’état des ressources en eau. Si des risques de manque d’eau sont perçus par certains, ils sont attribués essentiellement à la sécheresse et non à une surexploitation des ressources, la pollution est négligée. L’érosion des sols dans les zones d’arenização n’est pas considérée comme un enjeu, ces espaces sont improductifs, mais ne menacent pas la rentabilité globale des exploitations. C’est plus l’érosion en nappe au sein des

  19. Tectonic Evolution of Chinese Petroleum Basins Évolution tectonique des bassins pétroliers chinois

    Directory of Open Access Journals (Sweden)

    Zhu X.

    2006-10-01

    Full Text Available Petroleum basins in China are closely related to the tectonic regimes in different stages of geological evolution. The Mesozoic and Cenozoic basins were controlled by the deformation of the lithosphere of the Chinese plate in the course of subductions y neighboring plates situated in opposite directions. The crustal position may be a decisive factor for the different styles of basin development. Paleozoic (including Sinian and parts of Triassic basins, on the other hand, might have been related to the fragmentation and reunification as well as the accretion of the ancient platform. The superposition of basins of different regimes or different generations brought about a complex set of depositional and structural characteristics influencing both constructively and destructivelythe mode of distribution of oil and gas. Les bassins pétroliers de la Chine ont une liaison étroite avec les régimes tectoniques des différents étages de l'évolution géologique. Les bassins mésozoiques et cénozoïques ont été affectés par la déformation de la lithosphère de la plaque chinoise au cours de subduction des plaques voisines situées en directions opposées. La position de la croûte est peut-être un facteur déterminant pour les styles différents du développement du bassin. Les bassins paléozoïques (y compris le Sinien et une partie du Trias sont d'autre part liés à la fragmentation et la réunification, de même que l'accrétion des plates-formes anciennes. La superposition des bassins à régimes différents ou à générations différentes a créé une série sédimentaire et influence constructivement et destructivement le mode de distribution et de redistribution du pétrole et du gaz.

  20. Modélisation thermodynamique et cinétique des réactions diagénétiques dans les bassins sédimentaires. Présentation du modèle géochimique KINDISP Thermodynamic and Kinetic Modelling of Diagenetic Reactions in Sedimentary Basins. Description of the Geochemical Code Kindisp

    Directory of Open Access Journals (Sweden)

    Clement A.

    2006-11-01

    ème eau-roche. Ainsi, après le calcul de la distribution ionique des éléments à partir de la composition chimique de la solution, c'est la dissolution irréversible d'un ou plusieurs minéraux réactifsqui va faire évoluer l'ensemble du système géochimique formé d'espèces aqueuses, de minéraux primaires et secondaires. Pour un incrément de temps dt, l'apport de matière en solution est fonction de la vitesse de dissolution des minéraux réactifs . L'intérêt du modèle thermodynamique et cinétique KINDISP par rapport à un modèle purement thermodynamique est le suivi de l'évolution géochimique du système eau-roche selon la durée des réactions, c'est-à-dire qu'il est réellement prédictif en fonction du temps. Le modèle KINDISP a été appliqué pour simuler des interactions eaux/roches naturelles ou induites. A basse température, on peut citer l'étude des effets de pluies acides sur l'altération superficielle d'un massif granitique, l'estimation du temps de formation d'un horizon latéritique et les effets de polluants sur l'environnement. A plus haute température (>60 °C, le programme KINDISP a permis de simuler la prise en compte de réactions diagénétiques dans les bassins sédimentaires en vue d'exploitation des réservoirs ou bien l'étude d'un système de réactions hydrothermales provoquées par un stockage de chaleur (géothermie . . . ou l'enfouissement de colis de déchets radioactifs. . . Le second article de la série présentera quelques résultats obtenus par le modèle géochimique KINDISP appliqué à l'étude du bassin pétrolier de la Mahakam en Indonésie (Brosse et al. , 1994. Most transformations on the earth's surface are controlled by the interactions between water and rocks. The minerals that make up the rocks react with aqueous solutions; primary minerals are dissolved, thus freeing ionic species in solution and secondary minerals precipitate at thermodynamic equilibrium or in an oversaturated domain. The alteration

  1. Ressources hydriques du bassin synclinal d'Essaouira (Maroc

    Directory of Open Access Journals (Sweden)

    Youbi, N.

    2000-08-01

    Full Text Available Not available.La cuenca sinclinal de Essaouira está constituida por un conjunto de unidades sinclinales, siendo las principales la de Bouabout (en la zona frontal y la de Essaouira (en la zona trasera. Estas unidades contienen las reservas de agua más importantes de la región que se encuentran en el acuífero Cenomaniense-Turoniense de Bouabout y en los acuíferos del Turoniense y Plio-Cuaternario de la zona sinclinal de Essaouira. El principal río que atraviesa esta cuenca es el denominado Igrounzar (en la zona frontal y Ksob (en la zona trasera. Es un río perenne gracias a las fuentes Cenomanienses-Turonienses de la zona frontal. Más del 50 % del volumen de agua de este río fluye entre los meses de noviembre y enero. Medidas de aforo diferenciales efectuadas a lo largo del ciclo hidrológico 1990-1991 (Fekri, 1993 demuestran que el Oued Ksob alimenta los acuíferos Plio-Cuaternarios y turoniense por flujos de 42 l/s y 64 l/s, respectivamente. El estudio hidrogeológico de los acuíferos de esta cuenca muestra que las aguas subterráneas fluyen del SE hacia el noroeste en el acuífero Plio-Cuaternario, y hacia el noroeste, el noreste y el oeste a nivel del acuífero Cenomaniense-Turoniense. El estudio hidroquímico permite identificar el origen de las mineralizaciones de las aguas, sus facies y sus calidades. La hidrología isotópica permite estimar las áreas de recarga de los acuíferos y sus interacciones, y definir las relaciones entre las dos unidades que constituyen la cuenca. También muestra que la recarga de los acuíferos por las lluvias eficaces se produce sin una notable evaporación.

  2. Radioactivity in a mountain ecosystem: the Haut Bassin du Var

    International Nuclear Information System (INIS)

    2002-01-01

    After the Chernobyl accident, the IPSN realized a study of the radioactive fallout in the mountain area of the Var (France). Today the main radionuclides are the cesium 134 and 137, others disappeared because of their short half-life. In this paper, the artificial radioactivity of soils and sediments is concerned. The study shows a concentration of the contamination in some specific areas, especially in soils abounding in organic matter. The dose measured can not lead to significant exposures. (A.L.B.)

  3. Houilleres du Bassin de Lorraine - calculation of AFC drive power

    Energy Technology Data Exchange (ETDEWEB)

    1979-01-01

    Calculation method drawn up as a result of a test programme carried out by the CoRT working group on 'Coal and dirt clearance from the face - Face-ends' on 5 faces in the H.B.L. Describes the features of the conveyors. Presents a general formula for calculating the power requirement; how this is applied. Sets forth the experimental method for determining the formula coefficients plus annotations. Includes a table summarizing the various power factors (measured and theoretically calculated). Concludes that from the proposed methods, the best is that used by Potasses d'Alsace, on condition that certain of the coefficients are empirically validated. Includes a table giving features of the workings and the conveyors used.

  4. Indian Americans at Mille Lacs.

    Science.gov (United States)

    Holbert, Victoria L.; And Others

    The Training Center for Community Programs prepared a report on the Mille Lacs (Chippewa) Reservation in Minnesota. Data for the report were from 2 separate sources: a survey conducted by the Training Center with the assistance of the Mille Lacs community action program (1967) and an attitudinal survey conducted by Victoria Holbert during 1969.…

  5. Properties of BL Lac objects

    International Nuclear Information System (INIS)

    Wolfe, A.M.; Pittsburgh, University, Pittsburgh, Pa.)

    1980-01-01

    The properties of BL Lacertae objects are examined in light of their recently realized similarities to quasars and associations with galactic radiation. The criteria typically used to define BL Lac objects are analyzed, with attention given to radio spectra, optical continual, radio and optical variability, optical polarization and emission lines, and evidence that BL Lac objects and optically violent variables represent the most compact and strongly variable sources among the general class of quasars is discussed. Connections between BL Lac objects and the galaxies in which they have been observed to be embedded are discussed and it is pointed out that no low-luminosity quasars have been found to be associated with first-ranked giant ellipticals. Future observations which may clarify the properties and relationships of BL Lac objects are indicated

  6. Emergency planning and risk communications in the event of a dam failure : a case study of the Lievre River watershed in Quebec; Planification des interventions et communication des risques en cas de rupture de barrages : cas du bassin de la Riviere du Lievre au Quebec

    Energy Technology Data Exchange (ETDEWEB)

    Sassi, T [Quebec Ministere du Developpement durable, de l' Environnement et des Parcs, Quebec, PQ (Canada). Centre d' Expertise Hydrique

    2006-07-01

    This paper provided an outline of risk management and communications strategies used by the Centre d'Expertise Hydrique du Quebec (CEHQ) in its dam safety program. The CEHQ manages, monitors and maintains dams in Quebec. Dam monitoring occurs on a yearly basis for high capacity dams. The Quebec Dam Safety Act (DSA) requires that each dam owner whose consequence category is assessed at moderate or higher to draw up an emergency action plan which is then supplied to the municipality where the dam is located. If an emergency occurs, a communication process is established between the CEHQ, the Municipal Civil Security Organization (OMSC) and the Quebec Ministry of Public Security (MSP). The emergency communications procedure was adopted by CEHG to clarify to the roles and responsibilities of each organization involved. CEHG's emergency planning committee is comprised of municipal agencies, dam officials, and a range of other partners. The committee was formed after a study conducted in 1997 which investigated the effects of flooding in the La Lievre watershed. Emergency planning for the municipalities involved has taken place in 6 steps, 5 of which have been put in place. The committee is currently preparing its risk communication strategy as the final stage in its emergency planning strategy. The purpose of the strategy is to both inform and create a greater sense of responsibility among members of the public. Several campaigns have been launched to inform citizens of the potential risks involved if any of the 17 dams which form part of the Lievre basin are breached. Dam officials are also planning to hold public meetings to inform citizens of the municipal zones and buildings at greater risk of flooding. It was concluded that the risk communication strategy adopted by the CEHQ will help municipalities, individuals, and communities to prepare adequate and informed emergency plans. 5 refs., 1 fig.

  7. Impact of climate change on management plans for lakes St. Francois and Aylmer in southern Quebec; Impact des changements climatiques sur les plans de gestion des lacs Saint-Francois et Aylmer au sud du Quebec

    Energy Technology Data Exchange (ETDEWEB)

    Fortin, L G; Turcotte, R; Pugin, S; Cyr, J F; Picard, F [Centre d' Expertise Hydrique du Quebec, Quebec, PQ (Canada)

    2007-08-15

    The Centre d'Expertise Hydrique du Quebec (CEHQ) manages dams used for flood control, water supply, recreational activities and hydroelectricity in the province of Quebec. This paper addressed the issue of global warming and the impact on the hydrological regime within the next decades. The changes in the hydrological regime may pose a risk of losing the equilibrium between various objectives, identifiable through water management plans. The CEHQ conducted a pilot study for the Saint-Francois and Aylmer reservoirs in order to formulate a method for evaluating the adaptability of currently used management plans to climate change. The project was based on potential climate change scenarios as well as on deterministic and distributed hydrological models. Daily time steps were used to evaluate the hydrological impacts of climate change. The newly developed model makes it possible to evaluate and compare the occurrences where stream flows and water levels exceed critical values. The effectiveness of the management plans in both current and climate change scenarios was evaluated. Preliminary results suggest a possible increase in flood risk and fewer low water level occurrences. It was concluded that climate change will influence the trade-off between different management objectives of the reservoirs. Although adaptation measures may be feasible, it was determined that there is no unique solution to all climate change scenarios. 27 refs., 7 tabs., 12 figs.

  8. Le « bassin des carènes » et le service technique des constructions navales à Balard : un exemple de cité scientifique à Paris

    Directory of Open Access Journals (Sweden)

    Valérie Gaudard

    2009-05-01

    Full Text Available Le « bassin des carènes » à Balard abrite un ensemble cohérent d’édifices techniques, scientifiques et administratifs destinés à l’étude du comportement des navires et de leur propulsion en toutes situations. Créé à l’initiative de l’ingénieur Bertin et inauguré en 1906, le premier bassin, en béton, comptait alors parmi les quatre plus grands bassins du monde. À partir de 1932, Perret frères édifient une véritable cité scientifique : bâtiment administratif (IMH 1965, laboratoires, plusieurs bassins sont élevés en béton armé, avec un même soin accordé à l’ensemble.The ‘bassin des carènes’, the ship testing tank situated at Balard, in Paris, comprises a coherent ensemble of technical , scientific and administrative buildings devoted to the study of ships and their propulsion in different situations. The facility was first created in 1906 at the instigation of the engineer Bertin. At this date, the towing tank, constructed in reinforced concrete, was one of the four largest in the world. From 1932, the Perret brothers were commissioned to provide other constructions, completing an authentic scientific complex or ‘city’. This included the administrative building (given historic monument protection in 1932 and several other tanks, all constructed in reinforced concrete and with the same attention to detail.

  9. 91 Étude de la performance de la STEP du centre emplisseur de la ...

    African Journals Online (AJOL)

    PR BOKO

    -Un traitement chimique par coagulation par le polalumine un coagulant liquide à base de sulfate d'alumine. L'injection de ce dernier se fait à l'aide d'une pompe doseuse qui fonctionne automatiquement lorsque la pompe d'alimentation des eaux usées est en marche. L'agitateur du bassin de coagulation assure la.

  10. Utilisation d'un modèle distribué sur un petit bassin versant de savane (Booro-Borotou, Côte d'Ivoire)

    OpenAIRE

    Chevallier, Pierre; Girard, Georges

    1990-01-01

    Le programme Hyperbav a pour cadre un petit bassin versant du Nord-Ouest de la Côte d'Ivoire. Sur une superficie de 136 hectares des observations fines ont été conduites de 1984 à 1988 sur toutes les grandeurs intéressant le fonctionnement hydrique (hydrologie, climatologie, pédologie, hydrogéologie, botanique, agronomie). Il est intéressant de tenter d'intégrer ces informnations dans une représentation modéliste des échanges hydriques superficiels et internes. Le "modèle couplé" développé co...

  11. Les effets du changement climatique dans le bassin du Congo : la ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    22 avr. 2016 ... Adaptive Options for Growing Atriatry Rice in the Context of Climate Change : The Case of Marovoay. Madagascar's Plain of Marovoay, the country's second rice bowl with some 15,400 hectares of rice fields, is experiencing problems related to climat. View moreAdaptive Options for Growing Atriatry Rice in ...

  12. Intensification du recours à l'irrigation intermittente en riziculture afin ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Un nouveau projet de recherche vise à contribuer à la lutte contre le paludisme dans un bassin versant du nord du Pérou. Sur la côte du nord du Pérou, qui est fort aride, le paludisme est répandu en raison de l'irrigation abondante que nécessitent les rizières. La riziculture pratiquée dans cette région représente 60 % de la ...

  13. 268 Origine du phénomène d'ensablement déduite par combinaison ...

    African Journals Online (AJOL)

    zakaria

    Il est clair que le sable a toujours existé au niveau du bassin côtier de ... La lutte contre le phénomène de l'ensablement dans cette zone du Maroc exige la ..... ensablements à la préservation de la lagune car sa survie et la régulation de son ... transactions on pattern analysis and machine intelligence ISSN 0162-8828 ...

  14. Feasibility of Seismic Monitoring at a Potential CO2 Injection Test Site in the Paris Basin Évaluation des apports de la sismique à la surveillance d’un test d’injection de CO2 sur un site pilote potentiel du Bassin de Paris

    Directory of Open Access Journals (Sweden)

    Becquey M.

    2009-09-01

    Full Text Available Seismic effects of the injection of CO2 into a partially depleted oil field have been evaluated. Seismic modelling yields small time-lapse effects, including 0.4 ms time-shifts and 4 to 6% amplitude variations at the top and bottom of the reservoir. Amplitude variations at the reservoir level should be slightly larger at large incidence angles, but wave equation modelling shows that picking these reflections will not be easy, because of the presence of shear waves generated at upper interfaces. In-situ fracturation generates azimuthal anisotropy with velocity and amplitude variations with the propagation direction. These variations bear some information about the crack density, about the relation between the fracture nets and the porous medium, and about the fluid content in the pores and fractures. All these effects are however weak and their measurement requires careful seismic data acquisition and processing. Les effets sismiques de l’injection de dioxyde de carbone dans un gisement de petrole deplete ont fait l’objet d’une simulation. Ces effets sont faibles. On peut s’attendre a une variation des temps d’arrivee des reflexions sur des interfaces situees en dessous des reservoirs, de l’ordre de la demi-milliseconde, et a une variation d’amplitude au toit et au mur du reservoir de l’ordre de 6 %. La variation d’amplitude sera legerement plus forte pour les reflexions a grand deport, mais le pointe des reflexions et la mesure des amplitudes seront probablement plus difficiles, en raison de la presence d’ondes converties. La mesure de l’anisotropie azimutale, due a la presence de fractures, peut nous donner des informations sur l’etat de fracturation du reservoir et sur la connexion entre ces fractures et la matrice poreuse. La mesure de ces variations subtiles necessitera une acquisition soignee et un traitement precautionneux des donnees.

  15. Quelques observations sur la dynamique géomorphologique actuelle et passée de deux régions colombiennes: le haut bassin du rio Lebrija et le piemont nord-occidental de la Sierra Nevada de Santa Marta

    Directory of Open Access Journals (Sweden)

    1972-01-01

    Full Text Available Plus de 80000 Chinois furent 'importés de force' au Pérou entre 1854 et 1874, année où le Traité de Tien Tsin mit fin à ce trafic. Le Pérou de cette seconde moitié du XIXe souffrait d'un manque de main-d'oeuvre aigu, situation aggravée par la libération des esclaves noirs d'une part et d'autre part par l'essor prit par les haciendas sucrières, la construction des premières lignes de chemin de fer et l'extraction du guano. Entre 1860 et 1870 par exemple arrivèrent au seul port de Callao plus de 38000 'coolies'. En 1876, dans la province de Chancay à Aucallama étaient employés 1225 'asiáticos' soit plus de 66% de la population locale. A la fin du siècle, beaucoup étaient morts, certains avaient réussi à retourner en Chine, et d'autres s'étaient définitivement installés, rejoints par une seconde vague de Chinois commerçants attirés par l'essor du Pérou. La plupart des Chinois s'établirent sur la côte où ils étaient arrivés et dans des centres urbains. Même parmi ceux qui travaillèrent dans la construction des chemins de fer, très peu s'installèrent définitivement dans les régions minières d'altitude. A Acos, petite communauté (300 à 400 habitants de la vallée du Chancay établie dans un fond de vallée chaude ou 'quebrada de yunga', on a retrouvé la présence d'une micro-colonie de Chinois. Dans quelles circonstances aboutirent-ils dans ce village de 'sierra' (1 550 m? Comment s'y intégrèrent-ils et quel fut leur rôle économique sont les questions que nous nous poserons dans cet article, puis dans un suivant traitant spécifiquement de leur rôle dans l'essor du village. Notons un dernier point: le village d'Acos à l'arrivée des Chinois était dominé par un groupe de familles dites 'légitimes' qui détenaient surtout un pouvoir fondé sur la propriété foncière. Les Chinois, en contribuant à développer l'économie de Fue entre 1854 y 1874, año en que el Tratado de Tien Tsin puso fin a ese tr

  16. La variabilité hydrologique actuelle dans le bassin de l'Amazone

    Directory of Open Access Journals (Sweden)

    1998-01-01

    Full Text Available Les phénomènes climatiques de type “ El Niño ”, et son inverse “ La Niña ”, perturbent fortement le climat des régions tropicales du versant Pacifique (Pérou, Équateur, Colombie. Les perturbations du régime des précipitations altèrent à leur tour le régime hydrologique des fleuves de ces régions. Aussi l’analyse des longues séries hydrologiques est un outil pratique pour détecter l’ampleur et l’étendue de l’influence du “ Niño/Niña ” sur une région donnée. Cette analyse des séries chronologiques de débit a été menée sur 17 stations hydrologiques du DNAEE dans le bassin amazonien du Brésil. Les résultats obtenus montrent de bonnes corrélations entre l’indice d’oscillation austral (ENSO et l’indice des débits dans la partie nord-est du bassin (rios Branco et Jari. Ailleurs, des tendances régionales sont observées, mais ne sont pas toujours significatives. Dans le cas de l’Amazone à Óbidos, le “ Niño ” de 1983 a entraîné une chute de 16% du débit moyen annuel, alors que la “ Niña ” de 1989 est responsable d’un excédent de 14% du débit annuel. LA VARIABILIDAD HIDROLÓGICA ACTUAL EN LA CUENCA AMAZÓNICA. Los fenómenos climáticos de tipo “El Niño”, y su inverso “La Niña”, perturban fuertemente el clima de las regiones tropicales de la vertiente Pacífica (Perú, Ecuador, Colombia. Las perturbaciones del régimen de las lluvias alteran el régimen hidrológico de los ríos de la región. Así el análisis de las largas crónicas hidrológicas es una herramienta práctica para detectar la amplitud y la extensión del impacto de El Niño (o de la Niña sobre una cuenca. Este análisis de las crónicas de caudales fue realizada sobre 17 estaciones hidrológicas del DNAEE en la cuenca amazónica del Brasil. Los resultados obtenidos muestran buenas correlaciones entre el índice de oscilación austral (ENSO y el índice de caudales en la parte noreste de la cuenca (río Branco y río Jari

  17. Radioactivity in a mountain ecosystem: the Haut Bassin du Var; La radioactivite dans un ecosysteme de montagne: le haut bassin du var

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2002-07-01

    After the Chernobyl accident, the IPSN realized a study of the radioactive fallout in the mountain area of the Var (France). Today the main radionuclides are the cesium 134 and 137, others disappeared because of their short half-life. In this paper, the artificial radioactivity of soils and sediments is concerned. The study shows a concentration of the contamination in some specific areas, especially in soils abounding in organic matter. The dose measured can not lead to significant exposures. (A.L.B.)

  18. De la plate-forme urgonienne au bassin vocontien : le Barrémo-Bédoulien des Alpes occidentales entre Isère et Buëch (Vercors méridional, Diois oriental et Dévoluy)

    OpenAIRE

    Arnaud , Hubert

    1981-01-01

    Vol. 1 : Stratigraphie. Vol. 2 : Sédimentologie et paléogéographie. Vol. 3 (écrit en commun avec Annie Arnaud-Vanneau) : Atlas des microfaciès et de la microfaune de la plate-forme urgonienne entre la Chartreuse et le Dévoluy Géologie alpine. Mémoire.- 1981, n° 12; Entre la plate-forme urgonienne et la bordure septentrionale du bassin vocontien, les assises barrémo-bédouliennes du Vercors, de la zone de Borne et du Dévoluy sont caractérisées par des variations constantes d'épaisseur et de fac...

  19. The comparison between LAC and ALA

    Directory of Open Access Journals (Sweden)

    Tzu-heng Chiu

    2000-12-01

    Full Text Available A good library association serves its members, improves the librarianship, and helps library institutions achieving their missions. This article describes the history, missions and goals, organization structure, membership, financial sources, professional activities, publication, and website of the Library Association of China (LAC and American Library Association (ALA, respectively. Considering social / cultural / political differences between Taiwan and the United Sates, the author then compares these two library associations from the eight factors mentioned above. At the end, suggestions for the LAC are proposed.[Article content in Chinese

  20. Clustering environments of BL Lac objects

    Science.gov (United States)

    Wurtz, Ronald; Ellingson, Erica; Stocke, John T.; Yee, H. K. C.

    1993-01-01

    We report measurements of the amplitude of the BL Lac galaxy spatial covariance function, B(gb), for the fields of five BL Lacertae objects. We present evidence for rich clusters around MS 1207+39 and MS 1407+59, and confirm high richness for the cluster containing H0414+009. We discuss the ease of 3C 66 A and find evidence for a poor cluster based on an uncertain redshift of z = 0.444. These data suggest that at least some BL Lac objects are consistent with being FR 1 radio galaxies in rich clusters.

  1. Hydraulic Fracturing At Sedimentary Basin Scale Fracturation hydraulique à l'échelle des bassins sédimentaires

    Directory of Open Access Journals (Sweden)

    Schneider F.

    2006-12-01

    domain and then may initiate some fracturing. In other cases, the sediment changes its loading path but stay at the elastoplastic yield surface. In this case the theoretical considerations are not valid anymore and fracture criteria should be defined in the plastic domain. Fracturation hydraulique à l'échelle des bassins sédimentaires Fracturation hydraulique à l'échelle des bassins sédimentaires Le calcul du tenseur des contraintes est déterminant pour pouvoir simuler la fracturation hydraulique à l'échelle des bassins sédimentaires. Ce calcul n'est généralement pas abordé dans les modèles de bassins en raison de la complexité du problème. Pour pouvoir estimer le tenseur des contraintes, nous sommes alors amenés à formuler les hypothèses suivantes: - une des contraintes principales est verticale et égale, en module, au poids des terrains sus-jacents ; - la contrainte horizontale se déduit de la contrainte verticale à partir d'un coefficient de report K0 qui est une fonction de la profondeur et du contexte géodynamique. La consolidation est supposée être le résultat à la fois de la compaction mécanique et de la compaction chimique. La compaction mécanique est principalement due au réarrangement mécanique des grains pendant l'enfouissement. Elle peut se simuler, à l'échelle macroscopique, par une rhéologie élasto-plastique. La compaction chimique est le résultat des mécanismes de pression-dissolution. Elle peut être simulée, à l'échelle macroscopique, par une rhéologie viscoplastique. La surface de charge est complètement définie par l'union de la surface de consolidation avec les différentes limites de rupture. Cette surface de charge est alors définie par six surfaces élémentaires qui représentent la compaction verticale, la compaction horizontale, la rupture verticale en traction, la rupture horizontale en traction, la rupture subverticale en cisaillement, et la rupture subhorizontale en cisaillement. En raison du

  2. L'urbanisation du littoral méditerranéen

    Directory of Open Access Journals (Sweden)

    François Moriconi

    2000-03-01

    Full Text Available À partir d'une carte représentant la taille et la croissance des villes dans le bassin méditerranéen, l'article met en relation des faits objectifs avec quelques discours classiques sur l'urbanisation et la littoralisation. Cette approche contribue à montrer la nécessité du travail critique de déconstruction et d'objectivation de tout objet en géographie.

  3. Iron, brass and burial, the Kapsiki blacksmith and his many crafts

    NARCIS (Netherlands)

    Beek, van W.E.A.; Moñino, Y.

    1991-01-01

    Sommaire: Avant-propos (D. Barreteau, H. Tourneux) - Discours d'ouverture (A. Marliac) - Introduction (Y. Moñino) - Observations sur le nom du fer et de la forge dans le bassin du lac Tchad (H. Tourneux) - Les migrations des forgerons djorok chez les Massa du Cameroun (J. Pahai) - Les Murgur, ou

  4. 410 Contamination métallique de Gambusia holbrooki au niveau du ...

    African Journals Online (AJOL)

    youness

    Contamination métallique de Gambusia holbrooki au niveau du lac Fouarat et de l'estuaire Sebou dans la région du. Gharb (Maroc). Bachir EL BOUHALI1, Laila BENNASSER1*, Issad NASRI2,. Vincent GLOAGUEN3 et Aziza MOURADI1. 1 Université Ibn Tofail, Faculté des Sciences, Laboratoire de Biochimie et.

  5. L'Anti-Atlas occidental du Maroc: étude sédimentologique et reconstitutions paléogéographiques au Cambrien inférieur

    Science.gov (United States)

    Benssaou, M.; Hamoumi, N.

    2001-04-01

    L'étude lithostratigraphique en sédimentologique des formations du Cambrien inférieur de l'Anti-Atlas occidental (Maroc) a permis de mettre en évidence la diversité extrême des faciès allant des faciès continentaux jusqu'au faciès franchement marins. La répartition verticale de ces faciès ainsi que leurs associations ont permis de (i) proposer un nouveau découpage de la succession en formations lithostratigraphiques, (ii) reconstituer les milieux de dépôt (système fluviatile, lacs, fan-deltas, milieu littoral, plate-forme dominée par des constructions stromatolitiques et récifales et plate-forme dominée par les tempêtes) et (iii) établir des modèles paléogéographiques retraçant les différentes étapes d'évolution de ce bassin qui fait partie de la plate-forme nord-gondwanienne au Cambrien inférieur. Lithostratigraphical and sedimentological studies of the Early Cambrian formations in the western Anti-Atlas (Morocco) evidence their large diversity of facies ranging from continental to clearly marine. Vertical distribution and associations of facies afford opportunities to (i) suggest a new classification of the sedimentary sequence in terms of lithostratigraphic formations, (ii) restore the depositional environments (fluvial system, lake, delta fan, coast, stromatolite and reef-dominated platform, tempest-dominated platform), and (iii) establish palæogeographic models displaying the different evolutionary stages of this basin that constituted a part of the Lower Cambrian north-Gondwanian platform.

  6. Natural LacI from E. coli Yields Faster Response and Higher Level of Expression than the LVA-Tagged LacI

    DEFF Research Database (Denmark)

    Andreassen, Patrick Rosendahl; Fredberg, Sofie; Horan, Mattias

    2014-01-01

    The lac promoter is one of the most commonly used promoters for expression control of recombinant genes in E. coli. In the absence of galactosides, the lac promoter is repressed by its repressor protein LacI. Since the lac promoter is regulated by a repressor, overexpression of LacI is necessary...

  7. Description du peuplement piscicole du lac sahélien de Higa, un ...

    African Journals Online (AJOL)

    SARAH

    30 nov. 2015 ... 521 p. Meulenbroek P, 2013. Fish Assemblages and Habitat Use in the Upper Nakanbé Catchment, Burkina Faso. A thesis submitted to the University of Natural. Resources and Life Sciences, Vienna, Austria for the award of Master of Science. 65 p. Melcher AH, Ouedraogo R, Schmutz S, 2012. Spatial and.

  8. Distribution saisonnière du phytoplancton en fonction des ...

    African Journals Online (AJOL)

    SARAH

    25 avr. 2013 ... caractéristiques physico-chimiques du lac de Zowla ..... Figure 2 : Plan factoriel F1xF2 des variables en Août 2009 (en haut) et en Février 2010 (en bas). ..... Tesis. (Biólogo Marino), Facultad de Biología Marina,. Universidad ...

  9. Les Amphipodes du genre Gammarus dans le Bassin d’Arcachon

    NARCIS (Netherlands)

    Labourg, P.J.; Pinkster, S.; Stock, J.H.

    1971-01-01

    Five species of the genus Gammarus have been found in and around the Basin of Arcachon (southwestern France). Short notes on the autecology of these species are given. Literature records of G. duebeni and of G. aequicauda from the Basin rest on confusion with other species, as is proved by

  10. Geo-economy of the Caspian basin; Geoeconomie du bassin caspien

    Energy Technology Data Exchange (ETDEWEB)

    Raballand, G

    2003-05-15

    The Caspian area is essential for the development of the central Asia countries and Caucasus. Excepted the Iran and the Russia, these areas economy is poor. The hydrocarbons exploitation should reinforce the economic weight of these States. The author analyzes the Caspian area economies and shows that the basin economies are confronted with three handicaps, and that even with different economic ways, the soviet economic system is still present in the basin. (A.L.B.)

  11. Relation nappe-rivière dans le bassin versant du Bandama en ...

    African Journals Online (AJOL)

    Dr gatsin

    'Information Géographique (SIG). Traitement des images. L'objectif ici est de ..... effluents des ouvrages d'assainissement). Une faible connexion entre ces deux aquifères qui ralentirait la continuité hydraulique et donc un mélange de ces deux ...

  12. Pollution par les nitrates des eaux souterraines du bassin d'Essaouira (Maroc)

    Science.gov (United States)

    Laftouhi, Nour-Eddine; Vanclooster, Marnik; Jalal, Mohammed; Witam, Omar; Aboufirassi, Mohamed; Bahir, Mohamed; Persoons, Étienne

    2003-03-01

    The Essaouira Basin (Morocco) contains a multi-layered aquifer situated in fractured and karstic materials from the Middle and Upper Cretaceous (the Cenomanian, Turonian and Senonian). Water percolates through the limestone and dolomite formations of the Turonian stage either through the marls and calcareous marls of the Cenomanian or through the calcareous marly materials of the Senonian. The aquifer system may be interconnected since the marl layer separating the Turonian, Cenomanian and Senonian aquifers is thin or intensively fractured. In that case, the water is transported through a network of fractures and stratification joints. This paper describes the extent of the nitrate pollution in the area and its origin. Most of the wells and drillholes located in the Kourimat perimeter are contaminated by nitrates with some concentrations over 400 mg l-1. Nitrate contamination is also observed in the surface water of the Qsob River, which constitutes the natural outlet of the multi-layered complex aquifer system. In this area, agriculture is more developed than in the rest of the Essaouira Basin. Diffuse pollution of the karstic groundwater body by agricultural fertiliser residues may therefore partially explain the observed nitrate pollution. However, point pollution around the wells, springs and drillholes from human wastewater, livestock faeces and the mineralisation of organic debris close to the Muslim cemeteries cannot be excluded.

  13. Diversité du peuplement ichtyologique de la rivière Bagoé (Bassin ...

    African Journals Online (AJOL)

    Les indices de diversité spécifique, d'équitabilité et de similarité ont été calculés sur la rivière selon les ... orpailleurs le long de ce cours d'eau. Ce qui ... certains cours d'eau dont la rivière Bagoé. En ... richesse spécifique, traduisant la qualité.

  14. Caractérisation de la variabilité climatique : cas du bassin versant ...

    African Journals Online (AJOL)

    This study has the advantage of some statistical methods to interpret the spatiotemporal variability of precipitation sixteen rainfall stations located in the watershed of Medjerda (North East of Algeria) on a period ranging from 19 to 38 years. Whilst analyzing such series, there was an observed break in the period 1980 and ...

  15. La Sedimentation Argileuse dans le Bassin Côtier du Togo, Reflet ...

    African Journals Online (AJOL)

    During the marine sedimentation within the Togo coastal basin, the impact of input continental origin was very important despite their various nature and the sedimentary or diagenetic modifications demanded by active or passive receptive depositional environment. Sedimentary clays in the basin reflect climatic, tectonic ...

  16. 66 Le remplissage sédimentaire du bassin de Timgad et aquifères ...

    African Journals Online (AJOL)

    PR BOKO

    La seconde coupe située plus à l'Est, traversant l'extrémité sud de Djebel Amrane (Figure 3b) montre une structure plissée monoclinal recoupée par un accident, soulevant le substratum crétacé calcaire au nord et affaissant la partie néogène gréseuse au sud (210 Ohm-m). Les deux coupes transversales effectuées dans ...

  17. Architecture et remplissage sédimentaire du bassin profond du Golfe du Mexique: Modélisation stratigraphique et structurale du transect de Tuxpan

    OpenAIRE

    Alzaga , Humberto

    2008-01-01

    The Deep Basin of the Gulf of Mexico (DBGM) extends over eastern Mexico, the southeastern part of the United States, west of the Atlantic Ocean. This study, based on the interpretation and integration of seismic profiles, exploration wells and outcrop studies, focus on the deep part of the Gulf of Mexico, where bathymetry varies from 200 to 3750 m, thus comprising both the continental slope and the abyssal plain. The first part of this thesis focus on the description of the sedimentary infill...

  18. Structure-guided approach to site-specific fluorophore labeling of the lac repressor LacI.

    Directory of Open Access Journals (Sweden)

    Kalle Kipper

    Full Text Available The lactose operon repressor protein LacI has long served as a paradigm of the bacterial transcription factors. However, the mechanisms whereby LacI rapidly locates its cognate binding site on the bacterial chromosome are still elusive. Single-molecule fluorescence imaging approaches are well suited for the study of these mechanisms but rely on a functionally compatible fluorescence labeling of LacI. Particularly attractive for protein fluorescence labeling are synthetic fluorophores due to their small size and favorable photophysical characteristics. Synthetic fluorophores are often conjugated to natively occurring cysteine residues using maleimide chemistry. For a site-specific and functionally compatible labeling with maleimide fluorophores, the target protein often needs to be redesigned to remove unwanted native cysteines and to introduce cysteines at locations better suited for fluorophore attachment. Biochemical screens can then be employed to probe for the functional activity of the redesigned protein both before and after dye labeling. Here, we report a mutagenesis-based redesign of LacI to enable a functionally compatible labeling with maleimide fluorophores. To provide an easily accessible labeling site in LacI, we introduced a single cysteine residue at position 28 in the DNA-binding headpiece of LacI and replaced two native cysteines with alanines where derivatization with bulky substituents is known to compromise the protein's activity. We find that the redesigned LacI retains a robust activity in vitro and in vivo, provided that the third native cysteine at position 281 is retained in LacI. In a total internal reflection microscopy assay, we observed individual Cy3-labeled LacI molecules bound to immobilized DNA harboring the cognate O1 operator sequence, indicating that the dye-labeled LacI is functionally active. We have thus been able to generate a functional fluorescently labeled LacI that can be used to unravel mechanistic

  19. Les Territoires de l’eau et la décentralisation. La gouvernance de bassin versant ou les limites d’une évidence

    Directory of Open Access Journals (Sweden)

    Stéphane Ghiotti

    2006-02-01

    Full Text Available La mise en place progressive en France d’une politique territoriale de l’eau, propulse la gestion de la ressource au cœur des enjeux liés à l’aménagement et au développement du territoire. Le vaste mouvement de recomposition organisationnelle et politique en cours favorise cette approche fonctionnaliste par bassin. Cependant, il contribue également à asseoir la légitimité d’autres constructions territoriales – dont les logiques relèvent davantage de l'opportunisme stratégique des collectivités territoriales que de la dimension géographique et environnementale de l'eau. A côté DU territoire de l’eau (ré ? émergent ou se constituent DES territoires de l’eau.The progressive implementation of territorial water policy in France, raises the stakes for water management in land planning and territorial development. The current vast movements in organisational and political reshuffling, support an operational approach by basin. However, it also contributes to establish the legitimacy of other territorial constructions - whose logic derives more from the strategic opportunism of local authorities than from the geographical and environmental dimensions of water. By side of “a” water territory, sits in fact, “many” water territories.

  20. Églises et temples en bassins industriels : Belfort-Héricourt-Montbéliard (Franche-Comté (1944-2008

    Directory of Open Access Journals (Sweden)

    Yves-Claude Lequin

    2009-11-01

    Full Text Available Si l’on en juge par l’exemple de Belfort-Montbéliard, nombreux furent les lieux de culte - catholiques et luthériens - construits dans les bassins industriels français entre 1950 et 1968. Étapes : églises modernes « en majesté » vers 1950, églises sobres aux formes arrondies dans les ZUP vers 1960, préfabriqués après 1964, quasi arrêt en 1968, reconversion du bâti à partir de 1990. Raisons de cet essor puissant et du rapide déclin : les tensions sociales et les évolutions mentales des paroissiens.From the example of Belfort-Montbéliard, a fair number of places of worship - Catholic and Lutheran - were built in French industrial basins between 1950 and 1968. Stages: modern “in majesty” churches around 1950, sober buildings with curved shapes in priority development areas around 1960, prefabricated buildings after 1964, hardly any construction in 1968, conversion of buildings as from 1990. Reasons for this marked growth and for the swift decline: social tensions and evolution of parishioners ‘minds.

  1. Adaptation aux changements climatiques dans le bassin versant de ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    ... hydrologiques et agronomiques, les chercheurs étudieront l'évolution de la ... de coopération scientifique et technologique en appui aux projets de recherche ... de l'Institut d'étude du développement international de l'Université McGill.

  2. La cogestion des bassins versants transfrontaliers, pour favoriser la ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    La question du droit à l'eau et de la gestion de l'eau est une grande source de ... on s'efforcera de promouvoir des accords internationaux qui bénéficieront à tous ... un accord de coopération scientifique et technologique en appui aux projets ...

  3. Opening Up Natural Resource Based Industries for Innovation (LAC ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Opening Up Natural Resource Based Industries for Innovation (LAC). Commodities based on natural resources account for at least half of the exports of two-thirds of the countries in Latin America and the Caribbean (LAC). There is growing concern, however, that existing natural resource-based industries are ...

  4. Baseline surveys of Lac Bay benthic and fish communities, Bonaire

    NARCIS (Netherlands)

    Debrot, A.O.; Hylkema, A.; Vogelaar, W.; Meesters, H.W.G.; Engel, M.S.; Leon, R.; Prud'homme van Reine, W.F.; Nagelkerken, I.

    2012-01-01

    Lac Bay is a clear-water, 5 m deep shallow tropical lagoon of 7 km2 opening onto the wave and wind exposed east coast of the island of Bonaire, southern Caribbean. Over the last decades land reclamation by mangroves in Lac has been expanding the surface of turbid, saline backwaters into the bay at

  5. Optical Spectra Evolution of BL Lac Objects XW Bi1,∗ , BZ Wang2

    Indian Academy of Sciences (India)

    low-frequency peaked BL Lac objects (LBLs) is steeper than the high- frequency peaked BL Lac ... vision of BL Lac objects. Many investigators .... We are grateful to the Scientific Research Foundation of the Education Department of Yunnan ...

  6. Constraints on Moho Depth and Crustal Thickness in the Liguro-Provençal Basin from a 3d Gravity Inversion : Geodynamic Implications Contraintes sur la profondeur du moho et l'épaisseur crustale dans le bassin liguro-provençal à partir de l'inversion 3D de données gravimétriques : implications géodynamiques

    Directory of Open Access Journals (Sweden)

    Gaulier J. M.

    2006-12-01

    Full Text Available 3D gravity modelling is combined with seismic refraction and reflection data to constrain a new Moho depth map in the Liguro-Provençal Basin (Western Mediterranean Sea. At seismically controlled points, the misfit between the gravimetric solution and the seismic data is about 2 km for a range of Moho depth between 12 km (deep basin and 30 km (mainlands. The oceanic crust thickness in the deep basin (5 km is smaller than the average oceanic crust thickness reported in open oceans (7 km, pointing to a potential mantle temperature 30°C to 50°C below normal and/or very slow oceanic spreading rate. Oceanic crust thickness is decreasing towards the Ligurian Sea and towards the continent-ocean boundary to values as small as 2 km. Poor magma supply is a result of low potential mantle temperature at depth, lateral thermal conduction towards unextended continental margin, and decrease of the oceanic spreading rate close to the pole of opening in the Ligurian Sea. Re-examination of magnetic data (paleomagnetic data and magnetic lineations indicates that opening of the Liguro-Provençal Basin may have ceased as late as Late Burdigalian (16. 5 Ma or even later. The absence of significant time gap between cessation of opening in the Liguro-Provençal Basin and rifting of the Tyrrhenian domain favours a continuous extension mechanism since Upper Oligocene driven by the African trench retreat. Ce rapport présente un travail commun avec le Laboratoire de géodynamique de l'École normale supérieure (ENS. Ce travail doit être resitué dans son contexte : l'étude régionale du golfe du Lion a été possible dans le cadre du projet européen Integrated Basin Studies. Le développement du code d'inversion 3D avait fait l'objet de conventions avec l'ENS pendant les années précédentes. La mise en Suvre d'une telle inversion est désormais possible à l'IFP. Il n'y a pas d'interface pour ce calculateur. L'aide des collègues de l'ENS est souhaitable pour la

  7. Modelisation de l'erosion et des sources de pollution dans le bassin versant Iroquois/Blanchette dans un contexte de changements climatiques

    Science.gov (United States)

    Coulibaly, Issa

    Principale source d'approvisionnement en eau potable de la municipalite d'Edmundston, le bassin versant Iroquois/Blanchette est un enjeu capital pour cette derniere, d'ou les efforts constants deployes pour assurer la preservation de la qualite de son eau. A cet effet, plusieurs etudes y ont ete menees. Les plus recentes ont identifie des menaces de pollution de diverses origines dont celles associees aux changements climatiques (e.g. Maaref 2012). Au regard des impacts des modifications climatiques annonces a l'echelle du Nouveau-Brunswick, le bassin versant Iroquois/Blanchette pourrait etre fortement affecte, et cela de diverses facons. Plusieurs scenarios d'impacts sont envisageables, notamment les risques d'inondation, d'erosion et de pollution a travers une augmentation des precipitations et du ruissellement. Face a toutes ces menaces eventuelles, l'objectif de cette etude est d'evaluer les impacts potentiels des changements climatiques sur les risques d'erosion et de pollution a l'echelle du bassin versant Iroquois/Blanchette. Pour ce faire, la version canadienne de l'equation universelle revisee des pertes en sol RUSLE-CAN et le modele hydrologique SWAT ( Soil and Water Assessment Tool) ont ete utilises pour modeliser les risques d'erosion et de pollution au niveau dans la zone d'etude. Les donnees utilisees pour realiser ce travail proviennent de sources diverses et variees (teledetections, pedologiques, topographiques, meteorologiques, etc.). Les simulations ont ete realisees en deux etapes distinctes, d'abord dans les conditions actuelles ou l'annee 2013 a ete choisie comme annee de reference, ensuite en 2025 et 2050. Les resultats obtenus montrent une tendance a la hausse de la production de sediments dans les prochaines annees. La production maximale annuelle augmente de 8,34 % et 8,08 % respectivement en 2025 et 2050 selon notre scenario le plus optimiste, et de 29,99 % en 2025 et 29,72 % en 2050 selon le scenario le plus pessimiste par rapport a celle

  8. Pejoration pluviometrique et production agricole dans le bassin de ...

    African Journals Online (AJOL)

    ... l'amenuisement important du rendement agricole. Les corrélations faites entre hauteurs de pluie et rendement agricole sont très significatives. Face à cette situation, des adaptations de cultures aux péjorations pluviométriques ont été opérées. Des stratégies intégrées sont élaborées en vue d'un développement durable ...

  9. Adsorption Properties of Lac Dyes on Wool, Silk, and Nylon

    Directory of Open Access Journals (Sweden)

    Bo Wei

    2013-01-01

    Full Text Available There has been growing interest in the dyeing of textiles with natural dyes. The research about the adsorption properties of natural dyes can help to understand their adsorption mechanism and to control their dyeing process. This study is concerned with the kinetics and isotherms of adsorption of lac dyes on wool, silk, and nylon fibers. It was found that the adsorption kinetics of lac dyes on the three fibers followed the pseudosecond-order kinetic model, and the adsorption rate of lac dyes was the fastest for silk and the slowest for wool. The activation energies for the adsorption process on wool, silk, and nylon were found to be 107.15, 87.85, and 45.31 kJ/mol, respectively. The adsorption of lac dyes on the three fibers followed the Langmuir mechanism, indicating that the electrostatic interactions between lac dyes and those fibers occurred. The saturation values for lac adsorption on the three fibers decreased in the order of wool > silk > nylon; the Langmuir affinity constant of lac adsorption on nylon was much higher than those on wool and silk.

  10. The Discovery of Low-Luminosity BL Lacs

    Science.gov (United States)

    Rector, Travis A.; Stocke, John T.

    1995-12-01

    Many of the properties of BL Lacs have become explicable in terms of the ``relativistic beaming'' hypothesis whereby BL Lacs are ``highly beamed'' FR-I radio galaxies (i.e. our line of sight to these objects is nearly along the jet axis). Further, radio-selected BL Lacs (RBLs) are believed to be seen nearly ``on-axis'' (the line-of-sight angle theta ~ 8deg ) while X-ray selected BL Lacs (XBLs) are seen at larger angles (theta ~ 30deg ; the X-ray emitting jet is believed to be less collimated). However, a major problem with this model was that a transition population between beamed BL Lacs and unbeamed FR-Is had not been detected. Low-luminosity BL Lacs may be such a transition population, and were predicted to exist by Browne and Marcha (1993). We present ROSAT HRI images, VLA radio maps and optical spectra which confirm the existence of low-luminosity BL Lacs, objects which were previously mis-identified in the EMSS catalog as clusters of galaxies. Thus our results strengthen the relativistic beaming hypothesis.

  11. 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

    Science.gov (United States)

    Pham, Trinh Hung

    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).

  12. Infrared polarimetry and photometry of BL Lac objects. 3

    Energy Technology Data Exchange (ETDEWEB)

    Holmes, P A; Brand, P W.J.L. [Edinburgh Univ. (UK). Dept. of Astronomy; Impey, C D [Hawaii Univ., Honolulu (USA). Inst. for Astronomy; Williams, P M [UKIRT, Hilo, HI (USA)

    1984-10-15

    The data presented here is part of a continuing monitoring programme of BL lac objects with J, H and K photometry and polarimetry. A total of 30 BL Lac objects have now been observed photometrically. Infrared polarimetry has also been obtained for 24 of these objects. The sample is sufficiently large to examine statistically, and several important correlations have emerged. Internight variations and wavelength dependence of polarization indicate that BL Lac objects, as a class, may be understood in terms of a relatively simple two-component model.

  13. Suivi et modélisation de la dynamique des cyanobactéries dans les lacs urbains au sein de leur bassin versant

    OpenAIRE

    Silva , Talita

    2014-01-01

    Urban lakes, often artificial, are fully integrated into the urban environment and perform several roles that are important for the sustainable functioning of cities. These ecosystems are strongly affected by human activities such as urbanization, land use changes and surface imperviousness which raise runoff in volume and speed, causing greater carrying capacity and greater pollutant load to aquatic receptors. Because of these anthropogenic activities, many lakes in the world are eutrophic a...

  14. L’INVASION DU RÉSEAU HYDROGRAPHIQUE FRANÇAIS PAR LES MOLLUSQUES CORBICULA SPP. MODALITÉ DE COLONISATION ET RÔLE PRÉPONDÉRANT DES CANAUX DE NAVIGATION.

    Directory of Open Access Journals (Sweden)

    BRANCOTTE V.

    2002-04-01

    Full Text Available Originaire d’Asie et d’Afrique, Corbicula a colonisé la plupart des bassins hydrographiques européens depuis 1980. A la faveur de la découverte de nouvelles stations, les auteurs mettent en évidence l’importance du rôle des canaux de navigation dans la propagation du mollusque, par la mise en connexion des bassins versants et l’existence d’un milieu particulièrement favorable à la biologie de l’espèce. Corbicula a pénétré en France par au moins sept axes différents, parmi lesquels le Rhin joue un rôle prépondérant.

  15. De nouveaux éléments structuraux du complexe aquifère profond du bassin du Rharb (Maroc) : implications hydrogéologiques

    Science.gov (United States)

    Kili, Malika; El Mansouri, Bouabid; Chao, Jamal; Fora, Abderrahman Ait

    2006-12-01

    The Rharb basin is located in northwestern Morocco. It is a part of one of the most important hydrogeological basins of Morocco, and extends over some 4000 km 2. The nature of its Plio-Quaternary sedimentary fill and its structural and palaeoenvironmental contexts are reflected by great variations in aerial and temporal facies distribution. This distribution, in turn, is a direct cause of the observed complexity in the geometry of potentially water-bearing beds. In the present work, we present an image of potential new hydrogeological reservoirs and define new structures that partially explain their architecture. To cite this article: M. Kili et al., C. R. Geoscience 338 (2006).

  16. Infusion of water into a coal mass, carried out at the mines of Houilleres du Bassin du Nord et du Pas-de-Calais

    Energy Technology Data Exchange (ETDEWEB)

    1977-01-01

    This paper reports on research work concerning water infusion in order to reduce dust danger at working face. It also describes development of the process since 1950; improvements to various low flow methods; and factors governing the choice of a process. Infusion can be carried out from working face, or from levels. The paper also describes hole drilling (equipment and methods used); fitting out holes (equipment, cementing); inspection; and non-stop infusion.

  17. Conflictos geopolíticos por el agua en las cuencas mineras del Departamento de Oruro, Bolivia

    OpenAIRE

    Miranda, Víctor Hugo Perales

    2010-01-01

    Dans cet article, nous analyserons les conflits géopolitiques entre les acteurs reliés à la pollution minière des sous-bassins du lac Poopo dans le département de Oruro dans le sud-ouest de la Bolivie. À cette occasion, nous procéderons à la caractérisation sociale et hydrologique des bassins et de ses acteurs et de l’interaction entre les acteurs sur une analyse de la territorialisation des espaces des sous-bassins. In this paper, it is analyzed geopolitical water conflicts between involv...

  18. Transferts thermiques dans les bassins sédimentaires Heat Transfers in Sedimentary Basins

    Directory of Open Access Journals (Sweden)

    Perrin J. F.

    2006-11-01

    Full Text Available La connaissance de l'évolution des températures dans les bassins sédimentaires est un instrument utile pour l'exploration pétrolière. En effet, connaissant la cinétique de dégradation chimique, on peut prévoir les rendements de transformation de la matière organique dans un bassin donné. La localisation des roches mères permet ensuite d'évaluer le potentiel pétrolier d'un bassin. L'étude présentée ici traite d'un modèle numérique destiné à prévoir ces champs de température tout au long de l'histoire d'un bassin, le modèle servant aussi pour l'étude des phénomènes de dog-leg thermique. Le modèle prend en compte les transferts par conduction et convection forcée (écoulement de l'eau de compaction et calcule un état des pressions et porosités. II fournit des résultats conformes aux valeurs observées in situ, et permet d'expliquer les anomalies de pressions. Knowing how temperatures have evolved in sedimentary basins is of great importance for petroleum exploration. If the chemical degradation kinetics is known, the transformation yields of organic matter can be forecast in a given basin. Then the location of source rocks can be used to evaluate the petroleum potential of a basin. This article describes a numerical model designed to determine these temperature ranges during the entire history of a basin. The model can also be used to investigate thermal dog-leg phenomena. It takes transfers by conduction and forced convection into consideration (flow of compaction water and calculates pressure and porosity conditions. The results it gives are in good agreement with values observed in situ so that various pressure anomalies can be explained.

  19. Infrared polarimetry and photometry of BL Lac objects

    Energy Technology Data Exchange (ETDEWEB)

    Impey, C D; Brand, P W.J.L. [Edinburgh Univ. (UK); Wolstencroft, R D; Williams, P M [Royal Observatory, Edinburgh (UK)

    1982-07-01

    Infrared polarimetry and photometry have been obtained for a sample of 18 BL Lac objects. The data covers a period of one year and is part of a continuing monitoring programme; all observations were in the J,H and K wavebands. Large and variable degrees of polarization are a common property of the sample. Two BL Lac objects show wavelength-dependent polarization, with the polarization increasing towards shorter wavelengths, and two objects show evidence for position angle rotations over a five-day period. The relationship between changes in polarized and total flux is also discussed. The BL Lac objects cover an enormous range of infrared luminosity; the three most luminous having Lsub(IR) > 10/sup 46/ erg s/sup -1/ and the other end of the range having infrared luminosities similar to normal elliptical galaxies. These are the first published infrared polarimetric observations for eight of the sample.

  20. The use of lac-type promoters in control analysis

    DEFF Research Database (Denmark)

    Jensen, Peter Ruhdal; Westerhoff, H. v.; Michelsen, Ole

    1993-01-01

    experimentally by constructing E. coli strains, in which the chromosomal atp operon is transcribed from the lacUV5 and the tacI promoter. We measured the concentration of the c subunit of H+-ATPase, and found that the expression of this enzyme could be modulated between non-detectable levels and up to five times...... the wild-type level. Thus, in the absence of inducer, no expression of atp genes could be detected when the atp operon was controlled by the lacUV5 promoter, and we estimate that the expression was less than 0.0025 times the wild-type level. We show that the introduction of a lac Y mutation facilitated...

  1. Time-dependent inhomogeneous jet models for BL Lac objects

    Science.gov (United States)

    Marlowe, A. T.; Urry, C. M.; George, I. M.

    1992-05-01

    Relativistic beaming can explain many of the observed properties of BL Lac objects (e.g., rapid variability, high polarization, etc.). In particular, the broadband radio through X-ray spectra are well modeled by synchrotron-self Compton emission from an inhomogeneous relativistic jet. We have done a uniform analysis on several BL Lac objects using a simple but plausible inhomogeneous jet model. For all objects, we found that the assumed power-law distribution of the magnetic field and the electron density can be adjusted to match the observed BL Lac spectrum. While such models are typically unconstrained, consideration of spectral variability strongly restricts the allowed parameters, although to date the sampling has generally been too sparse to constrain the current models effectively. We investigate the time evolution of the inhomogeneous jet model for a simple perturbation propagating along the jet. The implications of this time evolution model and its relevance to observed data are discussed.

  2. Dynamic model of gene regulation for the lac operon

    Energy Technology Data Exchange (ETDEWEB)

    Angelova, Maia; Ben-Halim, Asma, E-mail: maia.angelova@northumbria.ac.uk, E-mail: asma.benhalim@northumbria.ac.uk [Intelligent Modelling Lab, School of Computing, Engineering and Information Sciences, Northumbria University, Newcastle upon Tyne NE2 1XE (United Kingdom)

    2011-03-01

    Gene regulatory network is a collection of DNA which interact with each other and with other matter in the cell. The lac operon is an example of a relatively simple genetic network and is one of the best-studied structures in the Escherichia coli bacteria. In this work we consider a deterministic model of the lac operon with a noise term, representing the stochastic nature of the regulation. The model is written in terms of a system of simultaneous first order differential equations with delays. We investigate an analytical and numerical solution and analyse the range of values for the parameters corresponding to a stable solution.

  3. Dynamic model of gene regulation for the lac operon

    International Nuclear Information System (INIS)

    Angelova, Maia; Ben-Halim, Asma

    2011-01-01

    Gene regulatory network is a collection of DNA which interact with each other and with other matter in the cell. The lac operon is an example of a relatively simple genetic network and is one of the best-studied structures in the Escherichia coli bacteria. In this work we consider a deterministic model of the lac operon with a noise term, representing the stochastic nature of the regulation. The model is written in terms of a system of simultaneous first order differential equations with delays. We investigate an analytical and numerical solution and analyse the range of values for the parameters corresponding to a stable solution.

  4. In vivo expression of the lacY gene in two segments leads to functional lac permease

    International Nuclear Information System (INIS)

    Bibi, E.; Kaback, H.R.

    1990-01-01

    The lacY gene of Escherichia coli was cut into two approximately equal-size fragments with Afl II and subcloned individually or together under separate lac operator/promoters in plasmid pT7-5. Under these conditions, lac permease is expressed in two portions: (i) the N-terminal portion (the N terminus, the first six putative transmembrane helices, and most of putative loop 7) and (ii) the C-terminal portion (the last six putative transmembrane helices and the C terminus). Cells harboring pT7-5 encoding both fragments transport lactose at about 30% the rate of cells expressing intact permease to a comparable steady-state level of accumulation. In contrast, cells expressing either half of the permease independently do not transport lactose. As judged by [ 35 S]methionine labeling and immunoblotting, intact permease in completely absent from the membrane of cells expressing lacY fragments either individually or together. Thus, transport activity must result from an association between independently synthesized pieces of lac permease. When the gene fragments are expressed individually, the N-terminal portion of the permease is observed inconsistently, and the C-terminal portion is not observed. When the gene fragments are expressed together, polypeptides identified as the N- and C-terminal moieties of the permease are found in the membrane. It is concluded that the N- or C-terminal halves of lac permease are proteolyzed when synthesized independently and that association between the two complementing polypeptides leads to a more stable, catalytically active complex

  5. Bassins – versants et décentralisation administrative : esquisse de comparaison France/Espagne

    Directory of Open Access Journals (Sweden)

    Sylvie Clarimont

    2004-10-01

    Full Text Available En France comme en Espagne, le bassin-versant devient le territoire de gestion de l’eau avant la mise en œuvre de mesures de décentralisation administrative. Son institutionnalisation est beaucoup plus précoce en Espagne (1926 qu’en France (1964. Confédérations hydrographiques et agences de bassin sont des établissements publics, placés sous tutelle ministérielle. Les premières sont créées pour améliorer la mobilisation de la ressource et son allocation dans un contexte d’augmentation de la demande. Les secondes doivent répondre aux problèmes croissants de pollution des eaux. Depuis les années 80, toutes deux sont confrontées à l’affirmation de collectivités territoriales dotées de compétences nouvelles en matière de gestion des eaux.

  6. Medicinal Plants Used for Neuropsychiatric Disorders Treatment in the Hauts Bassins Region of Burkina Faso

    Directory of Open Access Journals (Sweden)

    Prosper T. Kinda

    2017-05-01

    Full Text Available Background: In Burkina Faso, phytotherapy is the main medical alternative used by populations to manage various diseases that affect the nervous system. The aim of the present study was to report medicinal plants with psychoactive properties used to treat neuropsychiatric disorders in the Hauts Bassins region, in the western zone of Burkina Faso. Methods: Through an ethnobotanical survey using structured questionnaire, 53 traditional healers (TH were interviewed about neuropsychiatric disorders, medicinal plants and medical practices used to treat them. The survey was carried out over a period of three months. Results: The results report 66 plant species used to treat neuropsychiatric pathologies. Roots (36.2% and leaves (29% were the main plant parts used. Alone or associated, these parts were used to prepare drugs using mainly the decoction and the trituration methods. Remedies were administered via drink, fumigation and external applications. Conclusions: It appears from this study a real knowledge of neuropsychiatric disorders in the traditional medicine of Hauts Bassins area. The therapeutic remedies suggested in this work are a real interest in the fight against psychiatric and neurological diseases. In the future, identified plants could be used for searching antipsychotic or neuroprotective compounds.

  7. Evidence for an intermediate conformational state of LacY.

    Science.gov (United States)

    Jiang, Xiaoxu; Guan, Lan; Zhou, Yonggang; Hong, Wen-Xu; Zhang, Qinghai; Kaback, H Ronald

    2012-03-20

    LacY mutant Cys154 → Gly exhibits a periplasmic-closed crystal structure identical to the WT, but is periplasmic-open in the membrane. The mutant hardly catalyzes transport, but binds galactosides from either side of the membrane with the same affinity and is resistant to site-directed proteolysis relative to the pseudo-WT. Site-directed alkylation was also applied to 11 single-Cys mutants in Cys154 → Gly LacY in right-side-out membrane vesicles or after solubilization and purification in dodecyl-β-D-maltopyranoside (DDM). Unlike the pseudo-WT, Cys replacements on the periplasmic side of the Cys154 → Gly mutant label rapidly in the membrane without sugar, but labeling decreases markedly after the mutant proteins are purified. Thus, Cys154 → Gly LacY likely favors a higher-energy intermediate periplasmic-open conformation in situ, but collapses to a lower-energy periplasmic-closed conformation in DDM after purification. Notably, branched-chain or neopentyl glycol maltoside detergents stabilize Cys154 → Gly LacY in the membrane-embedded form.

  8. RADIO-WEAK BL LAC OBJECTS IN THE FERMI ERA

    Energy Technology Data Exchange (ETDEWEB)

    Massaro, F.; Marchesini, E. J. [Dipartimento di Fisica, Università degli Studi di Torino (UniTO), via Pietro Giuria 1, I-10125 Torino (Italy); D’Abrusco, R.; Smith, Howard A. [Smithsonian Astrophysical Observatory, 60 Garden Street, 02138 Cambridge, MA (United States); Masetti, N. [INAF—Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna, via Gobetti 101, I-40129, Bologna (Italy); Andruchow, I. [Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque, B1900FWA, La Plata (Argentina)

    2017-01-10

    The existence of “radio-weak BL Lac objects” (RWBLs) has been an open question, and has remained unsolved since the discovery that quasars could be radio-quiet or radio-loud. Recently, several groups identified RWBL candidates, mostly found while searching for low-energy counterparts of the unidentified or unassociated gamma-ray sources listed in the Fermi catalogs. Confirming RWBLs is a challenging task since they could be confused with white dwarfs (WDs) or weak emission line quasars (WELQs) when there are not sufficient data to precisely draw their broadband spectral energy distribution, and their classification is mainly based on a featureless optical spectra. Motivated by the recent discovery that Fermi BL Lacs appear to have very peculiar mid-IR emission, we show that it is possible to distinguish between WDs, WELQs, and BL Lacs using the [3.4]–[4.6]–[12] μ m color–color plot built using the WISE magnitudes when the optical spectrum is available. On the basis of this analysis, we identify WISE J064459.38+603131 and WISE J141046.00+740511.2 as the first two genuine RWBLs, both potentially associated with Fermi sources. Finally, to strengthen our identification of these objects as true RWBLs, we present multifrequency observations for these two candidates to show that their spectral behavior is indeed consistent with that of the BL Lac population.

  9. RADIO-WEAK BL LAC OBJECTS IN THE FERMI ERA

    International Nuclear Information System (INIS)

    Massaro, F.; Marchesini, E. J.; D’Abrusco, R.; Smith, Howard A.; Masetti, N.; Andruchow, I.

    2017-01-01

    The existence of “radio-weak BL Lac objects” (RWBLs) has been an open question, and has remained unsolved since the discovery that quasars could be radio-quiet or radio-loud. Recently, several groups identified RWBL candidates, mostly found while searching for low-energy counterparts of the unidentified or unassociated gamma-ray sources listed in the Fermi catalogs. Confirming RWBLs is a challenging task since they could be confused with white dwarfs (WDs) or weak emission line quasars (WELQs) when there are not sufficient data to precisely draw their broadband spectral energy distribution, and their classification is mainly based on a featureless optical spectra. Motivated by the recent discovery that Fermi BL Lacs appear to have very peculiar mid-IR emission, we show that it is possible to distinguish between WDs, WELQs, and BL Lacs using the [3.4]–[4.6]–[12] μ m color–color plot built using the WISE magnitudes when the optical spectrum is available. On the basis of this analysis, we identify WISE J064459.38+603131 and WISE J141046.00+740511.2 as the first two genuine RWBLs, both potentially associated with Fermi sources. Finally, to strengthen our identification of these objects as true RWBLs, we present multifrequency observations for these two candidates to show that their spectral behavior is indeed consistent with that of the BL Lac population.

  10. Can blueshifted Agn spectra explain B L Lac objects

    International Nuclear Information System (INIS)

    Basu, D.

    2009-01-01

    B L Lac spectra are almost completely devoid of any emission line, and absorption features are often present based on which redshifts are estimated. Several models have been proposed to explain the spectra, including the unification scheme currently most popular among astronomers. However, there appear to be ambiguities, uncertainties and contradictory results in this model, and many questions remain unanswered. Also, it involves the process of artificially enhancing the continuum to be concentrated to a high level, by the relativistically beaming jet action, in order to submerge the emission lines, partly or completely, to make them appear weak or invisible. Additionally, the sample based on which B L Lac objects have been included in the unification scheme is rather small to be statistically viable. In this context, we present an alternative and much simpler interpretation of the observed spectra of B L Lac objects, both emission and absorption, as blueshifted lines in Agn. Original spectra of fifty six objects available in the current literature are re-analyzed. Nine of these show only a single weak emission line and no absorption feature, while thirty five exhibit no emission feature but several absorption lines, and another twelve show more than one emission line and, in some cases, several absorption lines. It is demonstrated that emission lines in most B L Lac objects are blueshifted out of the visible region, and, hence, not seen at all. Emission lines, when seen, and absorption lines, are blueshifted and are identified with search lines of longer wavelengths that are naturally weak. Blue shifts, in emission and absorption features, are determined for all objects. Various considerations lead to the conclusion that the blue shift interpretation of B L Lac spectra is superior to and more important than the redshift interpretation. A possible explanation of observed blue shifts is presented in the scenario of the ejection process, a well-recognized mechanism

  11. lac operon induction in Escherichia coli: Systematic comparison of IPTG and TMG induction and influence of the transacetylase LacA.

    Science.gov (United States)

    Marbach, Anja; Bettenbrock, Katja

    2012-01-01

    Most commonly used expression systems in bacteria are based on the Escherichia coli lac promoter. Furthermore, lac operon elements are used today in systems and synthetic biology. In the majority of the cases the gratuitous inducers IPTG or TMG are used. Here we report a systematic comparison of lac promoter induction by TMG and IPTG which focuses on the aspects inducer uptake, population heterogeneity and a potential influence of the transacetylase, LacA. We provide induction curves in E. coli LJ110 and in isogenic lacY and lacA mutant strains and we show that both inducers are substrates of the lactose permease at low inducer concentrations but can also enter cells independently of lactose permease if present at higher concentrations. Using a gfp reporter strain we compared TMG and IPTG induction at single cell level and showed that bimodal induction with IPTG occurred at approximately ten-fold lower concentrations than with TMG. Furthermore, we observed that lac operon induction is influenced by the transacetylase, LacA. By comparing two Plac-gfp reporter strains with and without a lacA deletion we could show that in the lacA(+) strain the fluorescence level decreased after few hours while the fluorescence further increased in the lacA(-) strain. The results indicate that through the activity of LacA the IPTG concentration can be reduced below an inducing threshold concentration-an influence that should be considered if low inducer amounts are used. Copyright © 2011 Elsevier B.V. All rights reserved.

  12. Mediterranean climate modelling: variability and climate change scenarios; Modelisation climatique du Bassin mediterraneen: variabilite et scenarios de changement climatique

    Energy Technology Data Exchange (ETDEWEB)

    Somot, S

    2005-12-15

    Air-sea fluxes, open-sea deep convection and cyclo-genesis are studied in the Mediterranean with the development of a regional coupled model (AORCM). It accurately simulates these processes and their climate variabilities are quantified and studied. The regional coupling shows a significant impact on the number of winter intense cyclo-genesis as well as on associated air-sea fluxes and precipitation. A lower inter-annual variability than in non-coupled models is simulated for fluxes and deep convection. The feedbacks driving this variability are understood. The climate change response is then analysed for the 21. century with the non-coupled models: cyclo-genesis decreases, associated precipitation increases in spring and autumn and decreases in summer. Moreover, a warming and salting of the Mediterranean as well as a strong weakening of its thermohaline circulation occur. This study also concludes with the necessity of using AORCMs to assess climate change impacts on the Mediterranean. (author)

  13. Geosystemic fragility assesment of a carstica geological bassin: potential and limitations

    Directory of Open Access Journals (Sweden)

    Nicolas Floriani

    2006-06-01

    Full Text Available The incorporation of the Multicriteria Decision-Making methodology from fuzzy logic to the environmental data model has allowed an arrangement mapping of environmental fragility (Ross, 1994 from the studies of the hydrographic carstica bassin. At the first step of methodology were applyied different criteria to overcome the strict classification of soils. In the second step, the Analytical Hierarchy Process wich uses fuzzy logic allowed to determine differences among the soil, slope, geology and geomorfology, with major value ascribed to the soil. This way, it’s possible to remark that the purposes of alternative methodology presented a very different output from those of Ross (1994, as the last one based his presuppositions on sustainability theoretical debate.

  14. Evolution and Biophysics of the Escherichia coli lac Operon

    Science.gov (United States)

    Ray, J. Christian; Igoshin, Oleg; Quan, Selwyn; Monds, Russell; Cooper, Tim; Balázsi, Gábor

    2011-03-01

    To understand, predict, and control the evolution of living organisms, we consider biophysical effects and molecular network architectures. The lactose utilization system of E. coli is among the most well-studied molecular networks in biology, making it an ideal candidate for such studies. Simulations show how the genetic architecture of the wild-type operon attenuates large metabolic intermediate fluctuations that are predicted to occur in an equivalent system with the component genes on separate operons. Quantification of gene expression in the lac operon evolved in growth conditions containing constant lactose, alternating with glucose, or constant glucose, shows characteristic gene expression patterns depending on conditions. We are simulating these conditions to show context-dependent biophysical sources and costs of different lac operon architectures.

  15. Infrared polarimetry and photometry of BL Lac objects. 2

    Energy Technology Data Exchange (ETDEWEB)

    Impey, C D [Hawaii Univ., Honolulu (USA). Inst. for Astronomy; Brand, P W.J.L. [Edinburgh Univ. (UK). Dept. of Astronomy; Wolstencroft, R D [Royal Observatory, Edinburgh (UK); Williams, P M [United Kingdom Infrared Telescope Unit, Hilo, Hawaii (USA)

    1984-07-15

    Photometry and polarimetry in the JHK wavebands have now been obtained for 25 BL Lac objects. Several new objects have been monitored for periods of up to five days, and accumulated data is sufficient for a statistical analysis of polarization properties. The selection effects operating on this sample are examined first. A power-law spectrum is consistent with the spectra of all but three objects. A number of important new results are reported.

  16. Infrared polarimetry and photometry of BL Lac objects

    International Nuclear Information System (INIS)

    Impey, C.D.; Williams, P.M.

    1984-01-01

    Photometry and polarimetry in the JHK wavebands have now been obtained for 25 BL Lac objects. Several new objects have been monitored for periods of up to five days, and accumulated data is sufficient for a statistical analysis of polarization properties. The selection effects operating on this sample are examined first. A power-law spectrum is consistent with the spectra of all but three objects. A number of important new results are reported. (author)

  17. The BL Lac objects PKS 1144-379

    International Nuclear Information System (INIS)

    Nicolson, G.D.; Glass, I.S.; Feast, M.W.; Andrews, P.J.

    1979-01-01

    The highly variable radio source PKS 1144-379 has been monitored at 13 cm and 6 cm over a period of 3 years. It has been identified with an object whose photographic image is star-like. From infrared photometry, UBVRsub(KC)Isub(KC) photometry and spectroscopy, it is concluded that PKS 1144-379 is a BL Lac object with msub(v) approximately = 16.2. (author)

  18. Complex genomic rearrangement in CCS-LacZ transgenic mice.

    Science.gov (United States)

    Stroud, Dina Myers; Darrow, Bruce J; Kim, Sang Do; Zhang, Jie; Jongbloed, Monique R M; Rentschler, Stacey; Moskowitz, Ivan P G; Seidman, Jonathan; Fishman, Glenn I

    2007-02-01

    The cardiac conduction system (CCS)-lacZ insertional mouse mutant strain genetically labels the developing and mature CCS. This pattern of expression is presumed to reflect the site of transgene integration rather than regulatory elements within the transgene proper. We sought to characterize the genomic structure of the integration locus and identify nearby gene(s) that might potentially confer the observed CCS-specific transcription. We found rearrangement of chromosome 7 between regions D1 and E1 with altered transcription of multiple genes in the D1 region. Several lines of evidence suggested that regulatory elements from at least one gene, Slco3A1, influenced CCS-restricted reporter gene expression. In embryonic hearts, Slco3A1 was expressed in a spatial pattern similar to the CCS-lacZ transgene and was similarly neuregulin-responsive. At later stages, however, expression patterns of the transgene and Slco3A1 diverged, suggesting that the Slco3A1 locus may be necessary, but not sufficient to confer CCS-specific transgene expression in the CCS-lacZ line. (c) 2007 Wiley-Liss, Inc.

  19. METHODICAL APPROACHES TO THE CREATION MOOC (EXPERIENCE LAC

    Directory of Open Access Journals (Sweden)

    Larysa Nozdrina

    2016-03-01

    Full Text Available The article presents a number of problems, determining the current state of development of the domestic market of massive open online courses (MOOC. Considering the aim of the research, there is described national experience in this area, proposed and substantiated a number of the criteria and methodological approaches to the implementation of MOOC in higher education. The development of MOOC in the Lviv Academy of Commerce (LAC is reviewed as example. The main factors which determine the success of this educational innovation in the domestic market and are put under the research are software platforms, multimedia software for creating video lectures, course structure and support the learning process. The results of study which have been analyzed in this course can have a positive impact on the functioning of the market MOOC in Ukrainian universities. The article focuses on finding the ways of improving the process of developing and implementing MOOC in higher education in the example of LAC where Web-center on the MOODLE platform is used for e-learning. Further research should focus on the development of institutional mechanisms to ensure the effective design, implementation and operation of the MOOC in the universities in Ukraine. Particular attention during learning in massive open online course should be aimed at improving the educational process and to strengthen student's motivation in MOOC. Experience of MOOC's development in LAC can be useful at creating similar courses at other institutions of higher education in the different platforms, both MOODLE, and on the others

  20. 1604-IJBCS-Article-Guiguemde Issaka

    African Journals Online (AJOL)

    hp

    versants: le bassin du fleuve. Niger, le bassin du fleuve Nakanbé, le bassin du Mouhoun et le bassin de la Comoé. Le Nakanbé est le bassin le plus peuplé. La ville de Ouagadougou est presque entièrement tributaire des eaux de surface de ce ...

  1. Gene-mutation assays in lambda-lacZ transgenic mice : comparison of lacZ with endogenous genes in splenocytes and small intestinal epithelium

    NARCIS (Netherlands)

    Delft, J.H.M. van; Bergmans, A.; Dam, F.J. van; Tates, A.D.; Howard, L.; Winton, D.J.; Baan, R.A.

    1998-01-01

    Comparison of results derived from transgenic animal gene-mutation assays with those from mutation analyses in endogenous genes is an important step in the validation of the former. We have used λlacZ transgenic mice to study alkylation-induced mutagenesis in vivo in (a) lacZ and hprt in spleen

  2. Induction of the lac carrier and an associated membrane protein in Escherichia coli

    International Nuclear Information System (INIS)

    Lagarias, D.M.

    1985-01-01

    Induction of the lac operon in wild type Escherichia coli strains results in synthesis of a 16 kilodalton inner membrane protein in addition to the known products of the lacZ, lacY and lacA genes. Cells carrying the lacY gene on a plasmid over produce this 16 kilodalton polypeptide as well as the Lac carrier, the membrane protein product of the lacY gene. However, [ 35 S]methionine labeling of minicells carrying the lacY plasmid shows that the 16 kDa protein is not synthesized from the plasmid DNA. The 16 kDa protein was purified and partially characterized. It is an acidic membrane protein of apparent molecular weight 15,800 whose amino terminal sequence (NH 2 -Met-Arg-Asn-Phe-Asp-Leu-) does not correspond to any nucleotide sequence known in lac operon DNA. Using antibody prepared to the purified 16 kDa protein, a quantitative analysis of conditions under which this protein is made was accomplished, and reveals that the amount of 16 kDa protein which appears in the membrane is proportional to lac operon expression. Hybridization of a synthetic oligonucleotide probe complementary to the 5' end of 16 kDa protein mRNA shows that its synthesis is regulated at the level of transcription. A description of attempts to clone this gene is given. Possible functional roles for the 16 kDa protein are discussed

  3. C. Marcigny, E. Ghesquière, dir., L'île de Tatihou (Manche à l'âge du Bronze. Habitats et occupation du sol, DAF n° 96

    Directory of Open Access Journals (Sweden)

    Pierre-Yves Milcent

    2006-05-01

    Full Text Available L'ouvrage consacré à l'îlot de Tatihou illustre l'efficacité de la politique d'archéologie préventive initiée en Basse-Normandie ces dernières années. Il n'est pas inutile de se souvenir que la Protohistoire dans cette région faisait figure de parent pauvre par le passé, au point qu'il était extrêmement difficile d'articuler les données archéologiques armoricaines à celles que l'on connaissait pour le centre et le nord du Bassin parisien. En limite du Massif armoricain et près de la pointe no...

  4. Résultats de recherche | Page 7 | CRDI - Centre de recherches pour ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Maroc). Le bassin du Saïss est un sous-bassin versant du bassin du Sebou, situé dans le nord du Maroc. La diminution des précipitations et l'augmentation de la demande d'eau ont grandement réduit les eaux de surface dans le bassin du Saïss.

  5. Chemo-enzymatic modification of poly-N-acetyllactosamine (LacNAc oligomers and N,N-diacetyllactosamine (LacDiNAc based on galactose oxidase treatment

    Directory of Open Access Journals (Sweden)

    Christiane E. Kupper

    2012-05-01

    Full Text Available The importance of glycans in biological systems is highlighted by their various functions in physiological and pathological processes. Many glycan epitopes on glycoproteins and glycolipids are based on N-acetyllactosamine units (LacNAc; Galβ1,4GlcNAc and often present on extended poly-LacNAc glycans ([Galβ1,4GlcNAc]n. Poly-LacNAc itself has been identified as a binding motif of galectins, an important class of lectins with functions in immune response and tumorigenesis. Therefore, the synthesis of natural and modified poly-LacNAc glycans is of specific interest for binding studies with galectins as well as for studies of their possible therapeutic applications. We present the oxidation by galactose oxidase and subsequent chemical or enzymatic modification of terminal galactose and N-acetylgalactosamine residues of poly-N-acetyllactosamine (poly-LacNAc oligomers and N,N-diacetyllactosamine (LacDiNAc by galactose oxidase. Product formation starting from different poly-LacNAc oligomers was characterised and optimised regarding formation of the C6-aldo product. Further modification of the aldehyde containing glycans, either by chemical conversion or enzymatic elongation, was established. Base-catalysed β-elimination, coupling of biotin–hydrazide with subsequent reduction to the corresponding hydrazine linkage, and coupling by reductive amination to an amino-functionalised poly-LacNAc oligomer were performed and the products characterised by LC–MS and NMR analysis. Remarkably, elongation of terminally oxidised poly-LacNAc glycans by β3GlcNAc- and β4Gal-transferase was also successful. In this way, a set of novel, modified poly-LacNAc oligomers containing terminally and/or internally modified galactose residues were obtained, which can be used for binding studies and various other applications.

  6. 1699-IJBCS-Article- Matias Fonteh

    African Journals Online (AJOL)

    hp

    Gestion intégrée des ressources en eau dans le bassin versant du lac ... En prélude à l'élaboration d'une stratégie de gestion durable de l'eau du ..... dynamique des ressources en eau à l'échelle ... régulièrement les contrôles de la qualité.

  7. The business of refractive laser assisted cataract surgery (ReLACS).

    Science.gov (United States)

    Berdahl, John P; Jensen, Matthew P

    2014-01-01

    Refractive Laser Assisted Cataract Surgery (ReLACS) combines the femtosecond laser with other noncovered tests and services in an attempt to reduce spectacle dependence in combination with cataract surgery. Significant interest is present among ophthalmologists who are considering adopting this technology, however significant capital outlays and continuing expenses can make the decision to adopt ReLACS foreboding. We review the financial considerations of ReLACS and review the trends seen in early adopters of this technology. Recent findings have shown that ReLACS is a growing segment of cataract surgery. Most practices who have implemented the technology have broken even and have a positive outlook on the financial return of implementing the ReLACS program. The average break-even analysis point for practices is around 230 cases a year. ReLACS is growing and appears to be a financial viable approach for many practices.

  8. Impact of climate change on heavy precipitation events of the Mediterranean basin; Impact du changement climatique sur les evenements de pluie intense du bassin mediterraneen

    Energy Technology Data Exchange (ETDEWEB)

    Ricard, D.; Beaulant, A.L.; Deque, M.; Ducrocq, V.; Joly, A.; Joly, B.; Martin, E.; Nuissier, O.; Quintana Segui, P.; Ribes, A.; Sevault, F.; Somot, S. [Meteo-France et CNRS, Groupe d' Etude de l' Atmosphere Meteorologique (GAME), 31 - Toulouse (France); Boe, J. [California Univ., Dept. of Atmospheric and Oceanic Sciences, Los Angeles, CA (United States)

    2009-11-15

    A second topic covered by the CYPRIM project aims to characterize the evolution of heavy precipitation events in Mediterranean in the context of climate change. To this end, a continuous climate simulation from 1960 to 2099 has been run using a regional ocean-atmosphere coupled model under IPCC A2 emission scenario. Various techniques of down-scaling, down to the very fine 2 km scale, and methods to highlight synoptic environments favourable to heavy rain, have been used to estimate the impact of climate change on precipitation and hydrology over South-East France, both for the whole autumn season and the heavy rain events. (authors)

  9. Impacts du changement climatique sur l'hydrologie et la gestion des ressources en eau du bassin de la Meuse (synthèse bibliographique

    Directory of Open Access Journals (Sweden)

    Bauwens, A.

    2013-01-01

    Full Text Available Impacts of climate change on hydrological regimes and water resources management in the Meuse catchment. A review. This review examines the consequences of climate change on the hydrology of the Meuse catchment and on various water-related socio-economic sectors. It sums up the different modeling approaches in hydrological modeling, placing emphasis on current modeling assumptions and the restrictions inherent within them. It is useful to consider land use evolution and adapted management within the context of climate change, particularly with reference to agriculture. More specifically, a broader usage of physically-based hydrological models would be useful in order to represent climate change scenarios and possible adaptation tracks at the catchment scale. These physically-based hydrological models are able to represent a wide range of phenomena occurring in the water-soil-plant continuum. They thus allow a refinement of global hydrological solutions at the catchment scale, especially during low flow periods. Moreover, such models pave the way for the analysis of scenarios aimed at creating adaptation in the use and management of soils.

  10. CLUSTERING OF γ-RAY-SELECTED 2LAC FERMI BLAZARS

    Energy Technology Data Exchange (ETDEWEB)

    Allevato, V.; Finoguenov, A. [Department of Physics, University of Helsinki, Gustaf Hällströmin katu 2a, FI-00014 Helsinki (Finland); Cappelluti, N. [University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250 (United States)

    2014-12-20

    We present the first measurement of the projected correlation function of 485 γ-ray-selected blazars, divided into 175 BL Lacertae (BL Lacs) and 310 flat-spectrum radio quasars (FSRQs) detected in the 2 year all-sky survey by the Fermi-Large Area Telescope. We find that Fermi BL Lacs and FSRQs reside in massive dark matter halos (DMHs) with log M{sub h} = 13.35{sub −0.14}{sup +0.20} and log M{sub h} = 13.40{sub −0.19}{sup +0.15} h {sup –1} M {sub ☉}, respectively, at low (z ∼ 0.4) and high (z ∼ 1.2) redshift. In terms of clustering properties, these results suggest that BL Lacs and FSRQs are similar objects residing in the same dense environment typical of galaxy groups, despite their different spectral energy distributions, power, and accretion rates. We find no difference in the typical bias and hosting halo mass between Fermi blazars and radio-loud active galactic nuclei (AGNs), supporting the unification scheme simply equating radio-loud objects with misaligned blazar counterparts. This similarity in terms of the typical environment they preferentially live in, suggests that blazars tend to occupy the center of DMHs, as already pointed out for radio-loud AGNs. This implies, in light of several projects looking for the γ-ray emission from DM annihilation in galaxy clusters, a strong contamination from blazars to the expected signal from DM annihilation.

  11. Optical polarimetry of quasi-stellar and BL Lac objects

    International Nuclear Information System (INIS)

    Wills, D.; Wills, B.J.; Breger, M.; Hsu, J.

    1980-01-01

    We report observations of 39 extragalactic objects, using a new polarimeter at McDonald Observatory. Most of the observations were made in January and June 1980. Some new BL Lac objects were found, and some of the previously known members of this class were also observed. Polarization exceeding 3--4 times the formal rms uncertainties was found in about ten QSO's. Rapid changes of polarization and/or position angle occurred in some of the BL Lacertae objects, usually with <0.1-mag change in the total light

  12. Physico-Mechanical Properties of Coprocessed Excipient MicroceLac® 100 by DM(3) Approach.

    Science.gov (United States)

    Haware, Rahul V; Kancharla, Joseph P; Udupa, Aishwarya K; Staton, Scott; Gupta, Mali R; Al-Achi, Antoine; Stagner, William C

    2015-11-01

    To determine the effect of relative humidity (RH) and hydroxypropyl methylcellulose (HPMC) on the physico-mechanical properties of coprocessed MacroceLac(®) 100 using 'DM(3)' approach. Effects of RH and 5% w/w HPMC on MacroceLac(®) 100 Compressibility Index (CI) and tablet mechanical strength (TMS) were evaluated by 'DM(3)'. The 'DM(3)' approach evaluates material properties by combining 'design of experiments', material's 'macroscopic' properties, 'molecular' properties, and 'multivariate analysis' tools. A 4X4 full-factorial experimental design was used to study the relationship of MacroceLac(®) 100 molecular properties (moisture content, dehydration, crystallization, fusion enthalpy, and moisture uptake) and macroscopic particle size and shape on CI and TMS. A physical binary mixture (PBM) of similar composition to MacroceLac(®) 100 was also evaluated. Multivariate analysis of variance (MANOVA), principle component analysis, and partial least squares (PLS) were used to analyze the data. MANOVA CI ranking was: PBM-HPMC > PBM > MicroceLac(®)100 > MicroceLac(®)100-HPMC (p TMS values were lower than MicroceLac(®)100 and MicroceLac(®)100-HPMC (p TMS. Significant MicroceLac(®)100 changes occurred with % RH exposure affecting performance attributes. HPMC physical addition did not prevent molecular or macroscopic matrix changes.

  13. Au fil du temps (1976 ou la loi du seuil

    Directory of Open Access Journals (Sweden)

    Isabelle Singer

    2010-04-01

    Full Text Available Ayant choisi de vivre dans un camion, les héros d’Au fil du temps (film de Wim Wenders de 1976 font du seuil une expérience particulière. Celle de la rupture avec toute idée de foyer et celle du refus d’appartenance à la terre natale, cette terre allemande traversée par une frontière le long de laquelle ils vont voyager, et qui les renvoie à chaque instant aux traumatismes de l’Histoire. Sur le pare-brise du camion, l’extérieur (campagnes indifférenciées, villes à l’abandon… et l’intérieur se superposent. Au fil du temps questionne le paysage : il s’agit d’en décoller un à un les mythes qui le recouvrent. L’image alors n’est plus surface mais volume à traverser, à lacérer et découvrir ce qui est tissé dans le paysage. La démarche de Wenders est alors proche de celle d’un de ses contemporains : Anselm Kiefer. Le paysage allemand provoque le rejet parce qu’il y a là toujours plus que le visible : des strates et des strates de culpabilité que le mythe - et c’est sa fonction - a recouvert. Et qu’il s’agira ici, de soulever. Le choix du nomadisme, c’est celui d’un état de l’humanité antérieur à l’idée de patrie. Et c’est aussi celui de la solitude, comme prix à payer à ce refus d’appartenance et à cette mise à jour des mythes. L’appartenance à la terre allemande et à son Histoire est profondément problématique parce que les pères sont fondamentalement coupables. On se reconnaîtra alors des pères de substitution : des pères de cinéma (Nicholas Ray ou Fritz Lang. Et l’on substituera l’Histoire du cinéma à l’Histoire. Bruno est réparateur ambulant de projecteurs et Au fil du temps dressera, au gré de ses pérégrinations, un état des lieux du cinéma allemand des années soixante-dix : déliquescent, colonisé par les images hollywoodiennes. Il faut que cela change : état du cinéma ; état des protagonistes solitaires en quête d’une identit

  14. Le monstre du Loch Ness : entre science et folklore

    OpenAIRE

    Fairise, Nicolas

    2002-01-01

    Depuis sa première véritable observation alléguée en 1933 jusqu'à nos jours, le monstre du loch Ness n'a cessé de défrayer la chronique. Cette fameuse créature est ainsi devenue l'un des rares mythes zoologiques modernes. Dans un premier temps, la présente étude s'intéresse au lac lui-même, notamment sur les plans géophysique et biologique, afin de donner des éléments de description concernant le cadre souvent méconnu d'une des énigmes les plus médiatisées du siècle dernier. Tantôt anecdotiqu...

  15. SUIVI TEMPOREL DE LA VARIATION DU NIVEAU D’EAU DU LAC TSIMANAMPETSOTSA A PARTIR DES DONNEES D’ALTIMETRIE LIDAR DU SATELLITE ICESAT

    Directory of Open Access Journals (Sweden)

    Dhoimiri ANWAR MAEVA

    2017-12-01

    Full Text Available During its operating period, the ICESat lidar satellite collected data on the surface of the earth between 80 ° and -80 ° latitude. It allowed us to have several points of altimetry measurements on Lake Tsimanampetsotsa on several measurement campaigns. For each campaign, we found that standard deviation of the altimetric measurements made by ICESat is low. Measurements on the lake are therefore homogeneous with averages ranging from 4.9 m to 6.8 m and standard deviations that are less than 1 m. Observing the variation over time of the mean level of Lake Tsimanampetsotsa, there is a slight downward trend in the water level. The level of the lake lost 0.60 m between 2004 to 2009.

  16. World heritage site - Bien du Patrimoine Mondial - Kluane/Wrangell-St. Elias/Glacier Bay/Tatshenshini-Alsek

    Science.gov (United States)

    Labay, Keith A.; Wilson, Frederic H.

    2004-01-01

    The four parks depicted on this map make up a single World Heritage Site that covers 24.3 million acres. Together, they comprise the largest internationally protected land-based ecosystem on the planet. The United Nations Educational, Scientific and Cultural Organization (UNESCO) established the World Heritage Program in 1972 for the identification and protection of the world?s irreplaceable natural and cultural resources. World Heritage Sites are important as storehouses of memory and evolution, as anchors for sustainable tourism and community, and as laboratories for the study and understanding of the earth and culture. This World Heritage Site protects the prominent mountain ranges of Kluane, Wrangell, Saint Elias, and Chugach. It includes many of the tallest peaks on the continent, the world's largest non-polar icefield, extensive glaciers, vital watersheds, and expanses of dramatic wilderness. [Les quatre parcs figurant sur cette carte ne constituent qu?un seul site du patrimoine mondial recouvrant plus de 99 millions de km2, ce qui en fait le plus grand ecosysteme terrestre protege par loi internationale. En 1972, L?UNESCO (l?organisation des Nations Unies pour les sciences, l'education et la culture) a etabli le programme du patrimoine mondial afin d?identifier et de proteger les ressources naturelles et culturelles irremplacables de notre plan?te. Si les sites du patrimoine mondial sont si importants c'est parce qu'ils representent a la fois des livres ouverts sur l?histoire de la Terre, le point de depart du tourisme durable et du developpement des collectivites, des laboratoires pour etudier et comprendre la nature et la culture. Ce site du patrimoine mondial assure la protection des chaines de montagnes de Kluane, Wrangell, Saint Elias, et Chugach. On y trouve plusieurs des plus hauts sommets du continent, le plus grand champ de glace non-polaire du monde, d?immenses glaciers, des bassins hydrologiques essentiels, et de la nature sauvage a perte de vue.

  17. Louisiana SIP: LAC 33:III Ch 21 Subchap J, 2147--Limiting Volatile Organic Compound (VOC) Emissions from Reactor Processes and Distillation Operations in Synthetic Organic Chemical manufacturing Industry (SOCMI); SIP effective 1998-02-02 (LAc74) to more..

    Science.gov (United States)

    Louisiana SIP: LAC 33:III Ch 21 Subchap J, 2147--Limiting Volatile Organic Compound (VOC) Emissions from Reactor Processes and Distillation Operations in Synthetic Organic Chemical manufacturing Industry (SOCMI); SIP effective 1998-02-02 (LAc74) more...

  18. In vivo biocompatibility of p(HPMAm-lac)-PEG hydrogels hybridized with hyaluronan

    NARCIS (Netherlands)

    Sabbieti, Maria Giovanna; Dubbini, Alessandra; Laus, Fulvio; Paggi, Emanuele; Marchegiani, Andrea; Capitani, Melania; Marchetti, Luigi; Dini, Fabrizio; Vermonden, Tina; Di Martino, Piera; Agas, Dimitrios; Censi, Roberta

    2017-01-01

    The present study reports on the biocompatibility in vivo after intramuscular and subcutaneous administration in Balb/c mice of vinyl sulphone bearing p(HPMAm-lac1-2)-PEG-p(HPMAm-lac1-2)/thiolated hyaluronic acid hydrogels, designed as novel injectable biomaterials for potential application in the

  19. Flat radio-spectrum galaxies and BL Lacs I. Core properties

    NARCIS (Netherlands)

    Dennett-Thorpe, J; Marcha, MJ

    This paper concerns the relationship of BL Lacs and flat-spectrum weak emission-line galaxies. We compare the weak emission-line galaxies and the BL Lacs in a sample of 57 flat-spectrum objects (Marcha et al. 1996), using high-frequency radio and non-thermal optical flux densities, spectral indices

  20. Crisis in LAC : Infrastructure Investment, Employment and the Expectations of Stimulus

    OpenAIRE

    Schwartz, Jordan; Andres, Luis; Dragoiu, Georgeta

    2009-01-01

    Infrastructure investment is a central part of the stimulus plans of the Latin America and the Caribbean (LAC) region as it confronts the growing financial crisis. This paper estimates the potential effects on direct, indirect, and induced employment for different types of infrastructure projects with LAC-specific variables. The analysis finds that the direct and indirect short-term employ...

  1. Broad band energy distribution of UV-bright BL Lac objects

    International Nuclear Information System (INIS)

    Maraschi, L.; Tanzi, E.G.; Treves, A.

    1984-01-01

    IUE satellite data in the 1200-2000 and 1900-3200 A intervals of BL Lac objects are analyzed in terms of two discernible groups. A total of 25 BL Lac objects were observed, with differences between groups displayed in terms of the power slope of the energy of the UV emissions, i.e., slopes of 1 and 2. Comparisons of the spectra with those of quasars showed that quasars have a small spectral index in the 1000-6000 A band and no correlation exists between the spectral index and UV flux of the BL Lac objects. The comparisons underscore the lack of a thermal component for BL Lac objects. Steep spectral components in both BL Lac objects and highly polarized quasars emissions could both be due to synchrotron emission. Compton scattering of relativistic electrons off synchrotron photons could produce the X ray emissions. 44 references

  2. Broad band energy distribution of UV-bright BL Lac objects

    Energy Technology Data Exchange (ETDEWEB)

    Maraschi, L.; Tanzi, E.G.; Treves, A.

    1984-01-01

    IUE satellite data in the 1200-2000 and 1900-3200 A intervals of BL Lac objects are analyzed in terms of two discernible groups. A total of 25 BL Lac objects were observed, with differences between groups displayed in terms of the power slope of the energy of the UV emissions, i.e., slopes of 1 and 2. Comparisons of the spectra with those of quasars showed that quasars have a small spectral index in the 1000-6000 A band and no correlation exists between the spectral index and UV flux of the BL Lac objects. The comparisons underscore the lack of a thermal component for BL Lac objects. Steep spectral components in both BL Lac objects and highly polarized quasars emissions could both be due to synchrotron emission. Compton scattering of relativistic electrons off synchrotron photons could produce the X ray emissions. 44 references.

  3. The REX survey as a Tool to Test the Beaming Model for BL Lacs

    Science.gov (United States)

    Caccianiga, A.; della Ceca, R.; Gioia, I. M.; Maccacaro, T.; Wolter, A.

    We present the preliminary properties of the BL Lacs discovered in the REX survey (Caccianiga et al. 1998). In particular, we discuss a few sources with optical spectral properties ``intermediate'' between those of BL Lacs and those of elliptical galaxies. These objects could harbour weak (in the optical band) sources of non-thermal continuum in their nuclei and, if confirmed, they could represent the faint tail of the BL Lac population. The existence of such ``weak'' BL Lacs is matter of discussion in recent literature (e.g. Marcha et al. 1996) and could lead to a revision of the defining criteria of a BL Lac and, consequently, of their cosmological and statistical properties.

  4. Polarization burst in the BL Lac object AO 0235 + 164

    Energy Technology Data Exchange (ETDEWEB)

    Impey, C D; Brand, P W.J.L. [Edinburgh Univ. (UK). Dept. of Astronomy; Tapia, S [Steward Observatory, Tucson, AZ (USA)

    1982-01-01

    Simultaneous infrared and optical polarimetry and photometry have been obtained for AO 0235 + 164 covering a five night period. The object underwent a polarization burst during which the 2.2 ..mu..m polarization rose from 17.5 to 28.7 per cent and fell again to 14.9 per cent. At its peak the degree of optical polarization was 43.9 per cent, the highest linear polarization observed in a BL Lac object. The data show the degree of polarization to increase towards shorter wavelengths, and the effect is inconsistent with either dilution by a galactic component or simple one-component synchrotron models. The large changes in polarization are not accompanied by large changes in flux, a result which is difficult to explain using conventional models of these objects. Other implications of the luminosity, polarization and variability are discussed.

  5. Radiocarbon measurements at LAC-UFF: Recent performance

    Energy Technology Data Exchange (ETDEWEB)

    Linares, Roberto, E-mail: rlinares@if.uff.br [Laboratório de Radiocarbono, Universidade Federal Fluminense, Av. Gal. Milton Tavares de Souza, s/n, Niterói 24230-346 (Brazil); Macario, Kita D. [Laboratório de Radiocarbono, Universidade Federal Fluminense, Av. Gal. Milton Tavares de Souza, s/n, Niterói 24230-346 (Brazil); Santos, Guaciara M. [Earth System Science, University of California, Irvine, B321 Croul Hall, Irvine, CA 92697-3100 (United States); Carvalho, Carla [Laboratório de Radiocarbono, Universidade Federal Fluminense, Av. Gal. Milton Tavares de Souza, s/n, Niterói 24230-346 (Brazil); Departamento de Geoquímica, Universidade Federal Fluminense, Outeiro São João Batista, s/n, Niterói 24020-141 (Brazil); Santos, Hellen C. dos; Gomes, Paulo R.S.; Castro, Maikel D.; Oliveira, Fabiana M.; Alves, Eduardo Q. [Laboratório de Radiocarbono, Universidade Federal Fluminense, Av. Gal. Milton Tavares de Souza, s/n, Niterói 24230-346 (Brazil)

    2015-10-15

    In 2012 a single stage accelerator mass spectrometer from NEC was installed at the Radiocarbon Laboratory of Universidade Federal Fluminense (LAC-UFF), Niterói, Brazil. Here, we present a status report of our facility. We discuss some modifications applied to our combustion protocol in an attempt to reduce our procedural blank, mostly to processed organic samples. Measurements of reference materials indicate low precision and accuracy that are partially related to beam optics through the acceleration tube. We observed that once the beam current intensity increases the measured {sup 13}C{sup +}/{sup 12}C{sup +} becomes erratic. Therefore, in order to maintain the AMS-δ{sup 13}C values within reasonable values, so that fractionation corrections using the spectrometer {sup 13}C{sup +}/{sup 12}C{sup +} values does not affect the final {sup 14}C results, we are forced to limit the {sup 12}C{sup −} beam intensity to ⩽30 μA. This requirement was confirmed during our accuracy tests, when measuring selected annual tree-rings wood samples from a Parana pine (Araucaria angustifolia) between 1927 and 1997 previously measured at the Keck Carbon Cycle AMS Facility (KCCAMS), at the University of California, Irvine (UCI). At the LAC-UFF tree-ring wood samples were processed and measured in 4 different batches during a period of about 5 months. The {sup 14}C results were later compared to the high-precision data obtained at KCCAMS/UCI and reached a good agreement. Recently a problem associated with graphitization yield were finally identified and new measurements with secondary standards are promising.

  6. Evolutionary behaviour of AGN: Investigations on BL Lac objects and Seyfert II galaxies

    Science.gov (United States)

    Beckmann, V.

    2000-12-01

    The evolution and nature of AGN is still one of the enigmatic questions in astrophysics. While large and complete Quasar samples are available, special classes of AGN, like BL Lac objects and Seyfert II galaxies, are still rare objects. In this work I present two new AGN samples. The first one is the HRX-BL Lac survey, resulting in a sample of X-ray selected BL Lac objects. This sample results from 223 BL Lac candidates based on a correlation of X-ray sources with radio sources. The identification of this sample is 98% complete. 77 objects have been identified as BL Lac objects and form the HRX-BL Lac complete sample, the largest homogeneous sample of BL Lac objects existing today. For this sample, redshifts are now known for 62 objects (81 %). In total I present 101 BL Lac objects in the enlarged HRX-BL Lac survey, for which redshift information is available for 84 objects. During the HRX-BL Lac survey I found several objects of special interest. 1ES 1517+656 turned out to be the brightest known BL Lac object in the universe. 1ES 0927+500 could be the first BL Lac object with a line detected in the X-ray region. RX J1211+2242 is probably the the counterpart of the up to now unidentified gamma-ray source 3EG J1212+2304. Additionally I present seven candidates for ultra high frequency peaked BL Lac objects. RX J1054+3855 and RX J1153+3517 are rare high redshift X-ray bright QSO or accreting binary systems with huge magnetic fields. For the BL Lac objects I suggest an unified scenario in which giant elliptical galaxies, formed by merging events of spiral galaxies at z > 2, start as powerful, radio dominated BL Lacs. As the jet gets less powerful, the BL Lacs start to get more X-ray dominated, showing less total luminosities (for z definition to objects with a calcium break up to 40%, but do not support for the HBL the idea of allowing emission lines in the spectra of BL Lac galaxies. A way to find high redshift BL Lac objects might be the identification of faint X

  7. Evaluation des bassins par modélisation intégrée en deux dimensions des transferts techniques, de l'écoulement des fluides, de la genèse et de la migration des hydrocarbures Basin Evaluation by Integrated Two-Dimensional Modeling of Heat Transfer, Fluid Flow, Hydrocarbon Generation, and Migration

    Directory of Open Access Journals (Sweden)

    Chenet P. Y.

    2006-11-01

    Full Text Available Le modèle de bassin exposé dans cet article décrit les phénomènes physiques et chimiques qui contrôlent la formation d'accumulations commerciales, dans le cadre évolutif d'un bassin sédimentaire affecté par la subsidence : transfert de chaleur, compaction et écoulement de l'eau, génèse des hydrocarbures, migration diphasique de l'eau et des hydrocarbures. Le modèle tient compte des variations de conductivité et des phénomènes thermiques transitoires pour reconstituer les paléo-températures. Des validations quantitatives de la reconstitution des paléo-températures et du modèle cinétique de formation des hydrocarbures peuvent être obtenues par comparaison avec les températures actuelles et les données géochimiques. Les écoulements et les surpressions induits par la compaction sont décrits en couplant une loi de compaction avec la loi de Darcy, classique pour les écoulements de l'eau, en ajoutant un critère de fracturation hydraulique naturelle. Ceci permet de modéliser les pressions anormales dans des séquences deltaïques récentes (delta de la Mahakam, comme dans des bassins liés à des rifts anciens (mer du Nord. Une adaptation de la loi de Darcy aux écoulements diphasiques permet de reproduire la migration primaire et la migration secondaire. En particulier, le modèle permet d'étudier le rôle des pressions anormales et l'influence des failles sur la migration et le piégeage. Nos résultats confirment que les modèles de bassins peuvent contribuer à synthétiser les données géologiques, géophysiques et géochimiques dans un schéma cohérent. En précisant l'évaluation pétrolière, ces modèles constituent une des principales voies pour améliorer l'efficacité de l'exploration. The basin model discussed in this paper describes the physical and chemical phenomena that control the formation of commercial accumulations of hydrocarbons in the moving framework of a subsiding sedimentary basin : heat

  8. Fiche technique du spermogramme et du spermocytogramme ...

    African Journals Online (AJOL)

    En Afrique la stérilité du couple constitue un drame social. Selon l'OMS, environ 8 à 12 % des couples africains sont touchés par une infertilité. La responsabilité masculine dans la stérilité est comprise entre 30 à 40%. Les causes de l'infertilité masculine peuvent être l'impuissance et/ ou l'altération du sperme. L'étude de ...

  9. Louisiana SIP: LAC 33:III Ch. 7 - Table 2 - Ambient Air--Methods of Contaminant Measurements; SIP effective 1989-05-08 (LAc49) and 1989-08-14 (LAc50) to 2011-08-03 (LAd34 - Moved to Section 711 and revised [adds PM-2.5])

    Science.gov (United States)

    Louisiana SIP: LAC 33:III Ch. 7 - Table 2 - Ambient Air--Methods of Contaminant Measurements; SIP effective 1989-05-08 (LAc49) and 1989-08-14 (LAc50) to 2011-08-03 (LAd34 - Moved to Section 711 and revised [adds PM-2.5])

  10. The Géocarbone-Monitoring Project: Main Results and Recommendations for Monitoring Deep Geological CO2 Storage in the Paris Basin Le projet de recherche Géocarbone-Monitoring : principaux résultats et recommandations pour le monitoring des stockages géologiques profonds de CO2 dans le bassin Parisien

    Directory of Open Access Journals (Sweden)

    Fabriol H.

    2010-07-01

    Full Text Available The aim of the Géocarbone-Monitoring research project was the evaluation and testing, as far as possible, of the different monitoring methods that might be applied in the specific context of the Paris Basin. Their main objectives are to: detect and map CO2 in the reservoir rocks; detect and quantify possible leaks between the reservoir and the surface. The partners developed several thoughts and research concerning the various monitoring methods. This enabled drawing up a critical overview of existing methods and proposing leads for further work. At the end of the project, recommendations were made for the stakeholders of CO2 storage, i.e. the government departments regulating storage, decision-makers, and future site operators. In addition, a proposal was made for the general design and implementation of a monitoring programme of an injection test in the Paris Basin, within a depleted reservoir or a deep aquifer. Le projet de recherche Géocarbone-Monitoring avait pour but principal d’évaluer et de tester, le cas échéant, les différentes méthodes de surveillance qui pourraient être appliquées au contexte géologique spécifique du Bassin Parisien. Les objectifs principaux de celles-ci sont de : détecter et cartographier le CO2 dans le réservoir ; détecter les fuites éventuelles entre le réservoir et la surface et être en mesure de les quantifier. Les recherches et les réflexions menées par les partenaires sur les méthodes de surveillance et de monitoring ont permis de dresser une vision critique des méthodologies existantes et de proposer des pistes de progrès. À l’issue du projet, des recommandations ont été rédigées à l’intention des parties prenantes du stockage de CO2 (administration chargée de mettre en oeuvre la réglementation des stockages, décideurs et futurs opérateurs de site et un schéma général pour la conception et la mise en oeuvre d’un programme de monitoring pour un test d’injection dans

  11. Les Cahiers du CREAD

    African Journals Online (AJOL)

    Admin

    politique de bas prix exercée par la Russie et le Qatar vient confirmer ce constat ; s'ajoute à cela l'entrée éventuelle du gaz non conven- tionnel, dont son prix actuel de 3/4 $US, offre aux USA l'opportunité d'être exportateur de ..... les compagnies à produire en matière du gaz naturel, tels le prix du gaz naturel, le prix des ...

  12. Bulletin du CRDI #124

    International Development Research Centre (IDRC) Digital Library (Canada)

    Les femmes jouent un rôle important dans les exploitations minières artisanales et à petite échelle en Afrique subsaharienne. De concert ... Couverture du livre: Une vie saine pour les femmes et les enfants vulnérables · Couverture du livre: Entre el activismo y la intervención · Couverture du livre: Revitalizing Health for All.

  13. Bulletin du CRDI #125

    International Development Research Centre (IDRC) Digital Library (Canada)

    L'IOSRS remporte le prix de la diplomatie scientifique · GrowInclusive : la plateforme tant attendue est en construction · Toutes les nouvelles. Activités à venir. Semaine du développement international 2018. Le CRDI célébrera la Semaine du développement international du 4 au 10 février 2018. Suivez-nous sur Twitter et ...

  14. Le lac Titicaca: histoire perdue d'une mer intérieure

    Directory of Open Access Journals (Sweden)

    1992-01-01

    Full Text Available Cet article tente de reconstruire l’histoire de la région du lac Titicaca et de son peuplement pour la période précédant l’arrivée des espagnols. Á cet effet, nous avons utilisé une approche multidisciplinaire (sédimentologie, archéologie, mythologie qui autorise, depuis l’amont et dans la longue durée, un nouvel éclairage des données historiques du XVIe siècle. Malgré les changements climatiques et politiques ayant affecté les rives du Titicaca avant la Conquête espagnole, il existe une continuité historique qui va de la civilisation de Pukará à Hatuncolla en passant par Tiwanaku. Si la documentation espagnole ne rend pas compte de l’importance des anciennes populations riveraines et notamment des pukinas, c’est qu’il était de l’intérêt des envahisseurs successifs (aymaras, incas, espagnols de l’occulter. EL LAGO TITICACA: HISTORIA PERDIDA DE UN MAR INTERIOR. Este artículo constituye un intento de reconstrucción de la historia del lago Titicaca y de su poblamiento por el período que precede la llegada de los españoles. En esta perspectiva, hemos utilizado una aproximación multidisciplinaria (sedimentología, arqueología, mitología que autoriza una nueva lectura de las fuentes históricas del siglo XVI, a partir de datos remotos y en la larga duración. A pesar de los cambios climáticos y políticos que afectaron las orillas del Titicaca antes de la Conquista española, existe una continuidad histórica que va de la cultura de Pukará hasta Hatuncolla (pasando por Tiwanaku. Si la documentación española no toma en cuenta la importancia de las antiguas poblaciones lacustres, particularmente los pukinas, es porque el interés de sus sucesivos vencedores (aymara, incas, españoles era de ocultarla. THE TITICACA LAKE: HISTORY LOST IN THE CENTER OF A DEEP IMMENSITY. This article comprises an attempt to reconstruct the Titicaca Lake history and its colonization during the period preceding the Spanish arrival. On

  15. Modèle de compaction élasto-plastique en simulation de bassins Elastoplastic Compaction Model for Basin Simulation

    Directory of Open Access Journals (Sweden)

    Schneider F.

    2006-11-01

    Full Text Available Cet article présente un modèle de compaction des sédiments pour simulateurs de bassins sédimentaires. Dans ce modèle, les concepts précédemment utilisés dans le modèle TEMISPACK sont généralisés et décrits en s'inspirant des formalismes propres à la mécanique des roches et à la mécanique des sols. La compaction des sédiments est décrite, à l'échelle des temps géologiques, par un modèle élasto-plastique où les modules d'incompressibilité et d'écrouissage croissent lorsque la déformation augmente et où le seuil de plasticité est variable. La rhéologie est définie par une relation qui lie la porosité (ou le volume du sédiment à la contrainte effective moyenne en se plaçant dans l'hypothèse de déformation oedométrique. Ce modèle à rhéologie volumiquea été testé sur le logiciel COMP1D qui simule, en 1D, l'histoire géologique d'une colonne sédimentaire. Ce modèle ne doit être considéré que comme un premier pas vers un formalisme plus complet. This article describes a sediment compaction model for sedimentary basin simulators. In this model, the concepts previously used in the TEMISPACK model are generalized and described on the basis of formalisms inherent in rock mechanics and soil mechanics. Sediment compaction is described on the geologic time scale by an elastoplastic model (Fig. 1 in which the moduli of incompressibility and strain hardening increase as deformation increases and in which the plasticity threshold varies. The rheology is defined by an equation connecting the porosity (or volume of the sediment to the mean effective stress by situating itself within the hypothesis of consolidometric deformation. This model is quite similar to the ones used in soil mechanics. It differs only by the choice of the equations linking the volumic variation of the porous medium to the variation of the mean effective stress likewise, in this part coefficient alpha introduced in the definition of effective

  16. Comportement de l'espèce “Salmo trutta” dans le bassin de la Seine. Suite et fin

    Directory of Open Access Journals (Sweden)

    ARRIGNON J.

    1968-04-01

    Full Text Available Since a certain time, it is observed, in the spring, in Low Seine, that Salmonidae are coming together. These concentrations concern yearling subjects. Besides, a certain number of adult fisches, marked in Ile de France in 1961-1962-1963, have been captured downstream very far from their introduction point. Because of the investments supported by fishmen for restocking the rivers as well with immediately catchable trouts than with fry and young trouts, it became necessary to try to understand the reasons of the runnings down that has been recorded and to calculate their importance. These investigations have been carried out by a systematic marking of the fishes organized on the whole of the four great hydrographic Regions of the River Seine : — Bassin of the Upper Marne ; — Bassins of the Upper Seine and Upper Aube ; — Bassin of the Upper Aisne. On the 31th October 1967, on 30.030 marked subjects, 3.138 have been caught and recorded. On these 3.138 subjects, 3.049 had not left the Bassin into which they had been introduced. The general mark-returns percentage, reaches 10,15% and the percentage of the distant returns is 3,06‰ The highest returns percentage is this of the Upper Bassin of the River Aisne, where, locally, 34,80% of the marked fishes have been captured. But it can be noted a running down rate in Lower Seine and in the sea of 2,94‰ for the Upper Marne; 2,20‰ for the River Aube and the Upper Seine and 4,71‰ for the Ile de France. The highest removing is this of a trout introduced in Ardennes Country and which has been caught at Dunkerque Harbourgh after a travel of 805 kilometers, 530 of wihch made in fresh water. Investigations by marking have been completed by biometrical studies carried out on samples drawn of Lower Seine, at the time of the big concentrations of the winter end. A certain number of constatations derives from it : — There are groups of fishes which are inclined to run down-stream, more than the others

  17. Croissance et alimentation des larves de corégones (Coregonus lavaretus dans le lac d'Annecy de mars à avril 1996

    Directory of Open Access Journals (Sweden)

    CRETENOY L.

    1997-04-01

    Full Text Available La capture de plus de 400 larves de Coregonus lavaretus à 7 dates différentes dans le lac d'Annecy de mars à avril 1996 a permis d'étudier conjointement leur croissance et l'évolution de leur régime alimentaire. Les larves capturées ont une taille comprise entre 8,5 et 20 mm et un stade larvaire allant de 0 à 4, ces deux paramètres étant fortement liés. À mesure qu'elles grandissent, les larves qui consomment d'abord préférentiellement les stades larvaires des copépodes, puis leurs stades adultes, se nourrissent ensuite majoritairement de cladocères. La comparaison des structures de taille des proies ingérées et du zooplancton présent dans le lac conduit à évoquer la notion d'expérience acquise par les larves pour expliquer cette dérive alimentaire.

  18. lac repressor is an antivirulence factor of Salmonella enterica: its role in the evolution of virulence in Salmonella.

    Directory of Open Access Journals (Sweden)

    Sandeepa M Eswarappa

    Full Text Available The genus Salmonella includes many pathogens of great medical and veterinary importance. Bacteria belonging to this genus are very closely related to those belonging to the genus Escherichia. lacZYA operon and lacI are present in Escherichia coli, but not in Salmonella enterica. It has been proposed that Salmonella has lost lacZYA operon and lacI during evolution. In this study, we have investigated the physiological and evolutionary significance of the absence of lacI in Salmonella enterica. Using murine model of typhoid fever, we show that the expression of LacI causes a remarkable reduction in the virulence of Salmonella enterica. LacI also suppresses the ability of Salmonella enterica to proliferate inside murine macrophages. Microarray analysis revealed that LacI interferes with the expression of virulence genes of Salmonella pathogenicity island 2. This effect was confirmed by RT-PCR and Western blot analysis. Interestingly, we found that SBG0326 of Salmonella bongori is homologous to lacI of Escherichia coli. Salmonella bongori is the only other species of the genus Salmonella and it lacks the virulence genes of Salmonella pathogenicity island 2. Overall, our results demonstrate that LacI is an antivirulence factor of Salmonella enterica and suggest that absence of lacI has facilitated the acquisition of virulence genes of Salmonella pathogenicity island 2 in Salmonella enterica making it a successful systemic pathogen.

  19. Hétérogenéité quantitative et qualitative de la matière organique dans les argiles du Kimmeridgien du val de Pickering (Yorkshire, UK). Cadre sédimentologique et stratigraphique Quantitative and Qualitative Heterogeneity of the Organic Matter Within the Kimmeridge Clay of the Vale of Pickering (Yorkshire, Uk). Sedimentological and Stratigraphical Framework

    OpenAIRE

    Penn I. E.; Herbin J. P.; Muller C.; Geyssant J. R.; Melieres F.

    2006-01-01

    Les argiles du Kimméridgien contribuent à l'alimentation de nombreux gisements en mer du Nord. L'étude de quatre puits localisés sur une coupe Est-Ouest dans le Val de Pickering (Bassin de Cleveland) permet d'illustrer dans cette formation l'hétérogénéité de distribution verticale et latérale de la matière organique en terme de quantité et de qualité. La coupe étudiée (35 km de long, 200 m de haut) représente environ 6,5 millions d'années d'histoire géologique. Les analyses minéralogiques mon...

  20. Recherches géomorphologiques sur le Néogène du Sud du Pérou

    Directory of Open Access Journals (Sweden)

    1976-01-01

    Full Text Available Pendant la première moitié du Miocène, un cycle d'érosion en partie contemporaine de la fin du volcanisme Tacaza achève l'aplanissement complet des Andes. Les produits de l'érosion se déposent en régime endoréique dans des bassins situés entre la Cordillère Occidentale et Ia chaîne côtière (formation Moquegua. Ainsi se développe une surface de régradation en direction de la Sierra ('Puna' et d'aggradation vers la niveau de base (Moquegua. Cette surface s'étend sur un domaine continental séparé du domaine pacifique par la chaîne côtière non encore aplanie. En effet, sur le flanc pacifique de celle-ci, on note la présence de sédiments continentaux (membre supérieur de la formation Camaná semblables à ceux de la formation Moquegua, mais les deux aires de sédimentation sont séparées par une ligne quasi-continue de reliefs côtiers. Ces reliefs sont en partie ennoyés en direction du Pacifique par les dépôts marins de la formation Pisco (Miocène supérieur, concordants sur le membre supérieur continental de la formation Camaná. Pendant ce même Miocène supérieur, se produit le soulèvement du voussoir andin, qui, en faisant basculer la surface de la Puna en direction du Pacifique, déclenche son rajeunissement par un nouveau cycle d'érosion en fonction d'un réseau hydrographique Incliné vers le nouveau niveau de base (celui de la transgression Pisco. Ce réseau hydrographique s'installe sur une couverture d'ignimbrites fossilisant la surface de la Puna et reposant en concordance avec la formation Moquegua. Ces ignimbrites datées de 14 à 15 millions d'années, confirment l'âge miocène de la surface de la Puna dans le Sud du Pérou. Pendant le Pliocène Inférieur l'abaissement du niveau de base vient ajouter ses effets à ceux du soulèvement des Andes et une phase générale de dissection du relief se développe en régime exoréique. Les formes dégagées par l'érosion différentielle sont d'une part des

  1. "Cirque du Freak."

    Science.gov (United States)

    Rivett, Miriam

    2002-01-01

    Considers the marketing strategies that underpin the success of the "Cirque du Freak" series. Describes how "Cirque du Freak" is an account of events in the life of schoolboy Darren Shan. Notes that it is another reworking of the vampire narrative, a sub-genre of horror writing that has proved highly popular with both adult and…

  2. Computing Optical Variable Periods of BL Lac Object S5 0716+ 714 ...

    Indian Academy of Sciences (India)

    Computing Optical Variable Periods of BL Lac Object S5 0716+ 714 ... The study of long-term periodical variation is an important way to get the charac- ... continuous Fourier transform together, define a window function, and finally obtain.

  3. The genus Hypostomus Lacépède, 1803, and its Surinam representatives (Siluriformes, Loricariidae)

    NARCIS (Netherlands)

    Boeseman, M.

    1968-01-01

    CONTENTS Introduction................... 3 The generic name................. 4 The type species of Hypostomus Lacépède.......... 6 The identity of Acipenser plecostomus Linnaeus........ 9 The distribution and habitats of the Surinam species........ 12 The relationship of the Surinam

  4. La migration des hydrocarbures dans les bassins sédimentaires: aspects géologiques et géochimiques Migration of Hydrocarbons in Sedimentary Basins: Geological and Geochemical Aspects

    Directory of Open Access Journals (Sweden)

    Tissot B. P.

    2006-11-01

    Full Text Available La migration du pétrole vers les réservoirs et les pièges, et particulièrement son expulsion hors de la roche-mère où il s'est formé (migration primaire, est demeurée longtemps un des problèmes les plus mal connus de toute la géologie pétrolière. Le déplacement du pétrole et du gaz s'effectue en phase hydrocarbure séparée. L'eau, souvent considérée comme le véhicule du pétrole dans la migration, joue en fait un rôle négatif : il faut que la saturation en eau ait suffisamment diminué (par expulsion et que la saturation en hydrocarbures ait suffisamment augmenté (par génération à partir du kérogène pour que l'écoulement d'une phase hydrocarbure devienne possible. Le moteur de cette expulsion est le gradient de pression : l'élévation de la pression dans l'espace poreux des roches-mères résulte de trois causes (la charge sédimentaire, la genèse des hydrocarbures, et l'expansion thermique de l'eau. La microfissuration, qui survient quand la pression interne des fluides dépasse la résistance mécanique de la roche peut jouer un rôle important. Les observations dans les bassins sédimentaires de cas bien documentés sont encore trop rares. Il est, en particulier, difficile de calculer les réserves mobilisées à l'échelle d'un permis ou d'un bassin. La modélisation numérique de la migration, associée à celle de la genèse du pétrole et du gaz, offre des perspectives dans ce sens, mais elle demande encore des travaux complémentaires. Parmi les conséquences de la migration, on peut citer : la possibilité de corrélation huile/roche-mère, la teneur plus faible en produits lourds dans les réservoirs que dans les roches-mères et le rôle souvent joué par un déplacement où hydrocarbures liquides et gazeux forment une phase unique, qui migre en laissant progressivement derrière elle les fractions plus lourdes, par condensation rétrograde. Oil migration toward reservoirs and traps, and especially its

  5. Multi-Wave Luminosity of High-Synchrotron-Peaked TeV BL Lacs ...

    Indian Academy of Sciences (India)

    LIR, Lγ) in the radio, near-infrared and γ-ray wave bands for HSP. TeV BL Lacs. The results show that there are significant intrinsic cor- relations between LR and Lγ and between LIR and Lγ in all states. (high/average/low), and suggest that for HSP TeV BL Lacs, the Syn- chrotron Self-Compton radiation (SSC) is the main ...

  6. Analcite formation in the Agades Region (Niger); Les formations a analcime de la Region d'Agades (Republique du Niger)

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1966-06-01

    A study based mainly upon field mapping and drill cores examination, followed by a laboratory survey allows us to support a genetic hypothesis upon the formation of analcime in the 'Continental intercalaire' of Agades (Niger). Analcime could be generated from an early diagenesis of argillaceous sediments influenced by high soda content fossil waters inside confined continental sedimentary basins. (authors) [French] Une etude axee essentiellement sur des leves de terrain et des carottes de sondages, suivie d'une etude en laboratoire, permet d'avancer une hypothese genetique sur les formations a analcime du Continental Intercalaire d'AGADES (Niger). L'analcime resulterait d'une diagenese precoce de sediments argileux, sous l'influence d'eaux connees riches en soude, dans des bassins sedimentaires continentaux confines.

  7. Assimilation des débits dans le modèle hydrologique du système AIGA

    OpenAIRE

    Demargne, J.; Javelle, P.

    2015-01-01

    / Cette étude a été réalisée pour le SCHAPI (Service Central d'Hydrométéorologie et d'Appui à la Prévision des Inondations) et l'Irstea pour tester l'impact d'une assimilation des observations de débit sur les performances du système d'avertissement aux crues rapides AIGA. En collaboration avec l'IRSTEA, le SCHAPI développe actuellement un service d'avertissement automatisé valable sur l'ensemble de la France, qui sera complété par un service expertisé d'avertissement sur des bassins dits pri...

  8. Ce que nous faisons | Page 119 | CRDI - Centre de recherches pour ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Gestion axée sur la demande en vue de l'adaptation à la rareté de l'eau et aux changements climatiques dans le bassin du Saïss (Maroc). Le bassin du Saïss est un sous-bassin versant du bassin du Sebou, situé dans le nord du Maroc. Maroc, Nord Du Sahara, Sud Du Sahara. PROJECT ...

  9. L'habitat à une échelle globale : importance respective de l'immigration et de l'extinction pour les peuplements de poissons des petits lacs

    Directory of Open Access Journals (Sweden)

    TONN W. M.

    1995-04-01

    Full Text Available Les deux processus qui déterminent la structure des communautés dans les habitats insulaires sont l'immigration d'espèces vers une communauté et l'extinction de celles qui étaient présentes auparavant. Bien que l'immigration et l'extinction se produisent généralement à des échelles supérieures à celles qu'il est possible d'étudier avec des expériences plannifiées, les écologistes peuvent améliorer leur compréhension de ces processus par l'analyse des distributions observées ; l'isolation, le caractère discret et la réplication des systèmes insulaires présentent des avantages pour réaliser de telles analyses. Comme pour les communautés observées sur de vraies îles, la structure des peuplements de poissons dans les petits lacs forestiers est le résultat de l'immigration et de l'extinction. L'importance relative de ces processus peut dépendre des caractéristiques d'habitat des lacs et des espèces présentes, ainsi que du cadre régional et historique des lacs étudiés. Dans une région donnée, la composition des peuplements locaux de poissons peut être reliée à un ensemble particulier de conditions d'habitat et, dans la mesure où ces facteurs peuvent être liés à l'immigration et à l'extinction, il devrait être possible d'analyser les relations peuplement-environnement pour en déduire l'importance relative de ces processus dans la formation de peuplements locaux dans et entre les régions et les continents. Nous avons réalisé des analyses à large échelle des relations peuplement-environnement des petits lacs forestiers de quatre régions tempérées d'Europe et d'Amérique du Nord ; l'utilisation d'une série d'analyses canonique partielle des correspondances nous a permis de distinguer la variation due aux relations peuplements-environnement d'un ensemble de facteurs associés à l'immigration contre l'extinction. Les isolations passées et présentes varient selon les lacs et les régions, comme la

  10. Kayak Club

    CERN Multimedia

    Kayak Club

    2014-01-01

                            Canoë Kayak CERN (CKC)   Le Partenariat entre la concession Ford Pays de Gex du groupe Maurin et le Canoë kayak CERN (CKC), s'est concrétisé le jeudi 12 juin lors de la livraison du Ford transit Custom que la concession met à disposition du club pour favoriser le développement  de ses activités dans le bassin Lémanique,  eau vive sur le bassin d'Etrembières et Chancy , eau plate à Aire-la-Ville et le lac Leman, ou encore le Dragon boat à Divonne les Bains. Pour la remise des clés, Philippe Murgia directeur commercial Ford Pays de Gex, Olivier Barriere président du CKC et Yann Dunant jeune stagiaire a...

  11. Rumeurs et frayeurs autour de l'eau dans le monde

    International Development Research Centre (IDRC) Digital Library (Canada)

    majeure qu'en donnent les scientifiques est qu'en dehors du ..... de personnes qui sont allées à la recherche d'eau ou qui ont fui leurs ... Selon l'Onu, il existe 263 « bassins internationaux ». (fleuves, lacs ou ... un accord multilatéral sur des quotas de répartition ; ce .... apparus dans le cadre d'une coopération, par exemple.

  12. Beware of your Cre-Ation: lacZ expression impairs neuronal integrity and hippocampus-dependent memory.

    Science.gov (United States)

    Reichel, J M; Bedenk, B T; Gassen, N C; Hafner, K; Bura, S A; Almeida-Correa, S; Genewsky, A; Dedic, N; Giesert, F; Agarwal, A; Nave, K-A; Rein, T; Czisch, M; Deussing, J M; Wotjak, C T

    2016-10-01

    Expression of the lacZ-sequence is a widely used reporter-tool to assess the transgenic and/or transfection efficacy of a target gene in mice. Once activated, lacZ is permanently expressed. However, protein accumulation is one of the hallmarks of neurodegenerative diseases. Furthermore, the protein product of the bacterial lacZ gene is ß-galactosidase, an analog to the mammalian senescence-associated ß-galactosidase, a molecular marker for aging. Therefore we studied the behavioral, structural and molecular consequences of lacZ expression in distinct neuronal sub-populations. lacZ expression in cortical glutamatergic neurons resulted in severe impairments in hippocampus-dependent memory accompanied by marked structural alterations throughout the CNS. In contrast, GFP expression or the expression of the ChR2/YFP fusion product in the same cell populations did not result in either cognitive or structural deficits. GABAergic lacZ expression caused significantly decreased hyper-arousal and mild cognitive deficits. Attenuated structural and behavioral consequences of lacZ expression could also be induced in adulthood, and lacZ transfection in neuronal cell cultures significantly decreased their viability. Our findings provide a strong caveat against the use of lacZ reporter mice for phenotyping studies and point to a particular sensitivity of the hippocampus formation to detrimental consequences of lacZ expression. © 2016 Wiley Periodicals, Inc. © 2016 Wiley Periodicals, Inc.

  13. On the Redshift of TeV BL Lac Objects

    Energy Technology Data Exchange (ETDEWEB)

    Paiano, Simona; Falomo, Renato [INAF, Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5 I-35122 Padova (PD) (Italy); Landoni, Marco; Righi, Chiara [INAF, Osservatorio Astronomico di Brera, Via E. Bianchi 46 I-23807 Merate (Italy); Treves, Aldo [Università degli Studi dell’Insubria, Via Valleggio 11 I-22100 Como (Italy); Scarpa, Riccardo [Instituto de Astrofisica de Canarias, C/O Via Lactea, s/n E38205—La Laguna (Tenerife) (Spain)

    2017-03-10

    We report results of a spectroscopic campaign carried out at the 10 m Gran Telescopio Canarias for a sample of 22 BL Lac objects detected (or candidates) at TeV energies, aiming to determine or constrain their redshift. This is of fundamental importance for the interpretation of their emission models and for population studies and is also mandatory for studying the interaction of high-energy photons with the extragalactic background light using TeV sources. Optical spectra with high signal-to-noise ratios in the range 4250–10000 Å were obtained to search for faint emission or absorption lines from both the host galaxy and the nucleus. We determine a new redshift for PKS 1424+240 ( z = 0.604) and a tentative one for 1ES 0033+595 ( z = 0.467). We are able to set new spectroscopic redshift lower limits for three other sources on the basis of Mg ii and Ca ii intervening absorption features: BZB J1243+3627 ( z > 0.483), BZB J1540+8155 ( z > 0.672), and BZB 0J2323+4210 ( z > 0.267). We confirm previous redshift estimates for four blazars: S3 0218+357 ( z = 0.944), 1ES 1215+303 ( z = 0.129), W Comae ( z = 0.102), and MS 1221.8+2452 ( z = 0.218). For the remaining targets, in seven cases (S2 0109+22, 3C 66A, VER J0521+211, S4 0954+65, BZB J1120+4214, S3 1227+25, BZB J2323+4210), we do not validate the proposed redshift. Finally, for all sources of still-unknown redshift, we set a lower limit based on the minimum equivalent width of absorption features expected from the host galaxy.

  14. Du Pont de Nemours

    NARCIS (Netherlands)

    Ros JPM; LAE

    1994-01-01

    Dit rapport over Du Pont de Nemours (produktie van o.a. chemische stoffen) is gepubliceerd binnen het Samenwerkingsproject Procesbeschrijvingen Industrie Nederland (SPIN). In het kader van dit project is informatie verzameld over industriele bedrijven of industriele processen ter ondersteuning

  15. Les Cahiers du CREAD

    African Journals Online (AJOL)

    Admin

    6 juil. 2007 ... La problématique du développement du secteur de l'artisanat en. Algérie a été très peu abordée par les chercheurs, qu'ils soient universitaires ou .... La loi a institué une taxe d'apprentissage dont le taux a été fixé à. 1% de la ...

  16. Les outils du CERN

    CERN Multimedia

    1999-01-01

    C'est le plus grand centre mondial de recherche en physique des particules. Les outils du Laboratoire, accélérateurs et détecteurs de particules, figurent parmi les instruments scientifiques les plus complexes au monde. Des prix Nobels ont d'ailleurs été attribués aux physiciens du CERN pour leurs développements.

  17. Bulletin du CRDI #127

    International Development Research Centre (IDRC) Digital Library (Canada)

    La mise à l'échelle de la recherche et de l'innovation en vue de créer un impact social constitue une priorité pour la communauté du développement. Toutefois ... Nous avons renouvelé notre soutien à la recherche auprès du gouvernement de l'Inde ... Des femmes étudient à l'École supérieure d'infotronique d'Haïti.

  18. Simulation de la sédimentation dans un bassin évaporitique à niveau d'eau sous influence eustatique. Application au bassin paléogène de Mulhouse (Alsace, France Simulation of Sedimentation in an Evaporitic Basin At Water Level under Eustatic Influence. Application to the Paleogene Mulhouse Basin (Alsace, France

    Directory of Open Access Journals (Sweden)

    Carpentier B.

    2006-11-01

    Full Text Available Le programme SIMSALT permet, à partir de fonctions sinusoïdales simulant des variations climatiques et eustatiques, de modéliser la sédimentation dans une maille élémentaire d'un bassin évaporitique en communication restreinte permanente avec l'océan, les arrivées d'eau marine se faisant par l'intermédiaire d'un seuil topographique. En fonction des salinités calculées, le programme détermine s'il y a précipitation de sels ainsi que les épaisseurs sédimentées. Les principaux résultats fournis sont représentés par des colonnes lithologiques en fonction des épaisseurs cumulées et en fonction du temps. Ce programme renferme également un module permettant de tester des fonctions simulant la production-dégradation de la matière organique. Ce modèle a été appliqué à une partie de la série évaporitique d'âge Eocène supérieur - Oligocène inférieur du bassin de Mulhouse. L'application du modèle aux cyclothèmes carottés du sondage Max montre que la sédimentation évaporitique et organique peut être contrôlée principalement par des variations climatiques résultant de la somme de trois sinusoïdes, respectivement de période de l'ordre de 13000, 500 et 100 ans, associées à des variations eustatiques de période 13000 ans déphasées par rapport aux variations climatiques de même période. Avec le modèle SIMSALT, il est donc possible de reconnaitre les influences respectives de l'eustatisme et du climat sur la sédimenation évaporitique et organique dans un bassin en communication restreinte avec le domaine marin. The SIMSALT program takes sinusoidal functions simulating climatic and eustatic variations and uses them to model sedimentation in an elementary mesh of an evaporitic basin in permanent restricted communication with the ocean, with arrivals of seawater being determined via a topographic threshold (Fig. 1. For this, the mesh is assumed to be made up of several superposed elements (Fig. 2, i. e. a

  19. Le détritisme carbonate profond dans le Crétacé inférieur du Sud-Est français. Ses rapports avec l'eustatisme

    OpenAIRE

    Ferry , Serge

    1987-01-01

    Mémoire HS n° 13 - Géologie Alpine : Le détritisme dans le Sud-Est de la France - Colloque Association des Géologues du Sud-est - Grenoble 11-12 décembre 1986; 10 cycles eustatiques sont définis dans le Crétacé inférieur du Sud-Est français. Sur les plates-formes carbonatées, ils correspondent aux principales séquences "klupféliennes" de comblement, pour lesquelles le moteur tectonique (à-coups de subsidence) est mis en doute. Ces cycles ne sont repérables dans les séries de bassin que si l'a...

  20. Procédé de traitement d'une ressource fluide, programme d'ordinateur et module de traitement associés

    OpenAIRE

    Rapaport, Alain; Rousseau, Antoine; Harmand, Jérôme

    2014-01-01

    Pour la bio-remédiation de ressources en eau (bassins, lacs..) qui nécessitent d’être traitées par une unité externe de purification à l’aide de bioprocédés, l’invention consiste à mettre en place un réseau « intelligent » de pompes qui s’adaptent au cours du temps à l’hydrodynamique et à la pollution du milieu. L’objectif est d’optimiser la durée du traitement et/ou la qualité de la remédiation.

  1. Etude linguistique chez les Baráshi/Banyaambo du Rwanda

    African Journals Online (AJOL)

    User

    ont quitté le Nkóle et ont gagné le Mutára, puis le Mubarí qui est une large bande frontalière située au nord du lac Ihema jouxtant la région tanzanienne de Karágwe. Puis le mouvement s'est poursuivi vers le sud, ce qui explique donc la présence aujourd'hui d'une communauté Baráshi/Banyaambo au. Gisaká autour des ...

  2. Solving a discrete model of the lac operon using Z3

    Science.gov (United States)

    Gutierrez, Natalia A.

    2014-05-01

    A discrete model for the Lcac Operon is solved using the SMT-solver Z3. Traditionally the Lac Operon is formulated in a continuous math model. This model is a system of ordinary differential equations. Here, it was considerated as a discrete model, based on a Boolean red. The biological problem of Lac Operon is enunciated as a problem of Boolean satisfiability, and it is solved using an STM-solver named Z3. Z3 is a powerful solver that allows understanding the basic dynamic of the Lac Operon in an easier and more efficient way. The multi-stability of the Lac Operon can be easily computed with Z3. The code that solves the Boolean red can be written in Python language or SMT-Lib language. Both languages were used in local version of the program as online version of Z3. For future investigations it is proposed to solve the Boolean red of Lac Operon using others SMT-solvers as cvc4, alt-ergo, mathsat and yices.

  3. Plantes aromatiques du Plateau des Cataractes (Bassin du Congo. Caractérisation du chémotype de l'huile essentielle de Cymbopogon nardus (L. Rendle acclimaté au Congo-Brazzaville

    Directory of Open Access Journals (Sweden)

    Silou, T.

    2017-01-01

    Full Text Available Aromatic plants from the Plateau des Cataractes (Congo Basin. Chemotype characterization of essential oil of Cymbopogon nardus (L. Rendle acclimatized in Congo-Brazzaville. Description. The essential oils of Cymbopogon nardus (L. Rendle, Cymbopogon winterianus Jowitt, Cymbopogon flexuosus (Nees ex Steud. Wats and Cymbopogon citratus L. (DC. Stapf (lemongrass consist of more than 80% of the following constituents: citronellal, geraniol, citral, citronellol, geranyl acetate, and limonene. For the purposes of business transactions, it is therefore important to know the exact chemical composition of the essential oils produced. Objectives. Chemotype evaluation of C. nardus acclimatized on the Plateau des Cataractes. Method. The essential oils of C. nardus were extracted by hydrodistillation and analyzed by chromatography (GC and GC/MS over a period of more than ten years. Results. Cymbopogon nardus was found to produce a Java type citronella essential oil (C. winterianus with the following profile: citronellal (40-48%, geraniol (10-22%, citronellol (10-12%, limonene (2-3%, geranyl acetate (1-2%, linalool (1%. The difference between these two types of citronella, Java and Ceylon, was based on the relative proportions of their three main constituents: citronellal, geraniol and citronellol. Cymbopogon nardus is known for its high variability, with two varieties and sept subvarieties. Conclusions. The citronella established in West and Central Africa under the name of Cymbopogon nardus (Java type could be considered a Cymbopogon winterianus Jowitt, based on the chemical composition of its essential oil.

  4. Biologie de la reproduction du Cyprinidae, Barbus callensis dans le lac de barrage Hamiz (Algérie

    Directory of Open Access Journals (Sweden)

    Ould Rouis, S.

    2012-01-01

    Full Text Available Reproductive Biology of the Cyprinidae, Barbus callensis in an Algerian Dam. The freshwater fish, Barbus callensis (Valenciennes, 1842 was studied from 2005 to 2007 for the first time in Hamiz dam. This species endemic of North African continent is widely spread in the rivers of Algeria. This reservoir is situated in Boumerdes 35 km southeast of Algiers. During these three years, the monthly sampling was carried out by trammel nets, fishing near the dike during one night. At the same time, the fry was captured with a transparent plastic bottle baited with breadcrumbs put down near the lakeshore. The monthly follow-up of the gonadosomatic ratio (RGS reveals that the spawning period occurred between April and May. The evolution of the condition factor (K shows low seasonal variations. However, a lower value appears in spring when the temperature increases and the breeding begins. The sex ratio is higher for the adult females (1:2.8, more than 26 cm. The first sexual maturity size (L50 is lower for males (19.6 cm than for females (27.7 cm.

  5. 78 FR 45556 - Notice of Intent to Prepare an Environmental Impact Statement for the Proposed Lac du Flambeau...

    Science.gov (United States)

    2013-07-29

    ... application requests the Department to transfer into trust 20 acres of land located within the municipal... resort facility with Class III and Class II gaming, hotel, restaurant and retail facilities...

  6. Spectroscopy of optically selected BL Lac objects and their γ-ray emission

    Energy Technology Data Exchange (ETDEWEB)

    Sandrinelli, A.; Treves, A.; Farina, E. P.; Landoni, M. [Università degli Studi dell' Insubria, Via Valleggio 11, I-22100 Como (Italy); Falomo, R. [INAF-Osservatorio Astronomico di Padova, Vicolo dell Osservatorio 5, I-35122 Padova (Italy); Foschini, L.; Sbarufatti, B., E-mail: angela.sandrinelli@brera.inaf.it [INAF-Osservatorio Astronomico di Brera, Via Emilio Bianchi 46, I-23807 Merate (Italy)

    2013-12-01

    We present Very Large Telescope optical spectroscopy of nine BL Lac objects of unknown redshift belonging to the list of optically selected radio-loud BL Lac candidates. We explore their spectroscopic properties and possible link with gamma-ray emission. From the new observations we determine the redshifts of four objects from faint emission lines or from absorption features of their host galaxies. In three cases we find narrow intervening absorptions from which a lower limit to the redshift is inferred. For the remaining two featureless sources, lower limits to the redshift are deduced from the absence of spectral lines. A search for γ counterpart emission shows that six out of the nine candidates are Fermi γ-ray emitters and we find two new detections. Our analysis suggests that most of the BL Lac objects still lacking redshift information are most likely located at high redshifts.

  7. Lac repressor: Crystallization of intact tetramer and its complexes with inducer and operator DNA

    International Nuclear Information System (INIS)

    Pace, H.C.; Lu, P.; Lewis, M.

    1990-01-01

    The intact lac repressor tetramer, which regulates expression of the lac operon in Escherichia coli, has been crystallized in the native form, with an inducer, and in a ternary complex with operator DNA and an anti-inducer. The crystals without DNA diffract to better than 3.5 angstrom. They belong to the monoclinic space group C2 and have cell dimensions a = 164.7 angstrom, b = 75.6 angstrom, and c = 161.2 angstrom, with α = γ = 90 degree and β = 125.5 degree. Cocrystals have been obtained with a number of different lac operator-related DNA fragments. The complex with a blunt-ended 16-base-pair strand yielded tetragonal bipyramids that diffract to 6.5 angstrom. These protein-DNA cocrystals crack upon exposure to the gratuitous inducer isopropyl β-D-thiogalactoside, suggesting a conformational change in the repressor-operator complex

  8. The Radio-optical Spectra of BL Lacs and Possible Relatives

    Science.gov (United States)

    Dennett-Thorpe, J.

    I consider the suggestion that, in a complete sample of flat-spectrum radio sources with available optical spectra (Marcha et al 1996), the strong emission line objects, or those with passive elliptical spectra are close relatives of the BL Lacs. New observations at four frequencies from 8 to 43GHz are presented, together with evidence for radio variability. Combined with other radio and optical data from the literature, we are able to construct the non-thermal SEDs and use these to address the questions: are the optically passive objects potentially `unrecognised' BL Lacs (either intrinsically weak and/or hidden by starlight)? What is the relationship between the surprising number of strong emission-line objects and the BL Lacs?

  9. The clean development mechanism (CDM) an international perspective and implications for the LAC region

    International Nuclear Information System (INIS)

    2004-08-01

    This paper addresses activity a) an analysis of international CDM experiences and its potential contribution to the LAC region. The paper begins with a section describing the basic principles of the CDM and retrieves the lessons learned from the first two years of the CDM operation. This is followed by a more detailed review in section 2 of the on-going baseline and monitoring methodology approval process. In section 3, the development value of the CDM is explored. Section 4 describes the current CDM markets, while section 5 reviews the response of host countries to the CDM outside the LAC region. Section 6 describes the various capacity building programs established by Annex 1 countries to support the CDM. In each of the first 6 sections, implications for the LAC region are identified. Section 7 brings these conclusions together into a concise summary. (The author)

  10. Effet du Pediococcus acidilactici sur le bilan lipidique sanguin du ...

    African Journals Online (AJOL)

    Les résultats relatifs aux performances zootechniques ont montré que l'addition du probiotique a amélioré significativement le gain de poids pendant la phase de croissance se traduisant par un indice de consommation meilleur. Les dosages du cholestérol total, des triglycérides, du HDL et du LDL ont été déterminés à la ...

  11. STRUCTURAL ASPECTS REGARDING TO THE IMAGE OF ICE HOTEL BALEA LAC BREND

    Directory of Open Access Journals (Sweden)

    Marian ZAHARIA

    2008-06-01

    Full Text Available Applying a poll-based survey provides important information regarding the tourist offer particulars in Bâlea Lac area. On the day the survey is performed its main advantage is also outlined: the fact that this information display a good accuracy, are obtained in a short time span and involving relatively low expenses. Data collection and centralization of the answers provided by interviewed tourists regarding tourism practice in the Bâlea Lac area have led to drawing up distributions that are presented in the paper. Based on the respective information, statistics methods adequate to the study of tourist opinion on the Bâlea Lac Ice Hotel brand image. Several issues have been outlined, regarding the types of respondents based on their category, Romanian or foreigners, from Romania and based on destination countries, function of: the type of stay; the means of information; their answers referring to their first arrival at Bâlea Lac; the degree of destination assessment; their opinion on host reception; their preference for Bâlea Lac; appreciating value for money; age groups; gender; social and professional standing. The image created through the attractions and services provided in the Bâlea Lac tourist area by tourism activities closely related to the Ice Hotel is well appreciated, so that they have opened up a rather favourable expectancy for those willing to come back and for those tempted to try and spend their holidays in the presented hotel.

  12. The Sedentary Multi-Frequency Survey. I. Statistical Identification and Cosmological Properties of HBL BL Lacs

    OpenAIRE

    Giommi, P.; Menna, M. T.; Padovani, P.

    1999-01-01

    We have assembled a multi-frequency database by cross-correlating the NVSS catalog of radio sources with the RASSBSC list of soft X-ray sources, obtaining optical magnitude estimates from the Palomar and UK Schmidt surveys as provided by the APM and COSMOS on-line services. By exploiting the nearly unique broad-band properties of High-Energy Peaked (HBL) BL Lacs we have statistically identified a sample of 218 objects that is expected to include about 85% of BL Lacs and that is therefore seve...

  13. Les mots du jazz

    OpenAIRE

    Roueff, Olivier

    2007-01-01

    L’ouvrage d’André Schaeffner constitue la première analyse savante du jazz (1926). Il a marqué une étape importante dans le processus de réinvention du jazz en France en contribuant notamment, par sa réception et les polémiques qu’il a suscitées, à transformer l’identification du jazz d’une musique « américaine » à une musique « noire-américaine » (c’est-à-dire aux « racines » africaines). Les analyses proposées dans cet ouvrage, alors qu’elles désignaient des musiques que la critique de jazz...

  14. Les Basaltes de l’Atlas de Béni-Mellal (Haut Atlas Central, Maroc : un Volcanisme Transitionnel Intraplaque Associé aux Stades de L’évolution Géodynamique du Domaine Atlasique

    Directory of Open Access Journals (Sweden)

    Jaouad Guezal

    2013-07-01

    Full Text Available Les roches basaltiques de l’Atlas de Béni-Mellal (Haut-Atlas Central, Maroc, mises en place, dans les différents bassins synclinaux de la région, se manifestent en deux horizons volcaniques B1 et B2. Les deux événements éruptifs sont d’âge Jurassique moyen pour les coulées de l’horizon B1 et d’âge Crétacé inférieur pour celles de l’horizon B2. Les roches sont caractérisées par un faciès des basaltes à olivines. La composition de leurs clinopyroxènes est marquée par deux tendances : augite au niveau des basaltes à olivine du B1 et diopside au niveau de ceux du B2. La composition géochimique sur roche totale dévoile le caractère transitionnel de ces roches. La relative dissimilitude géochimique signalée au niveau des basaltes des deux horizons peut être expliquée par un début du changement de la nature du magmatisme de la région en relation avec l’évolution géodynamique du domaine atlasique.

  15. Multi-wavelength studies of TeV γ-ray emitting BL Lac objects

    Energy Technology Data Exchange (ETDEWEB)

    Kaufmann, Sarah Sabine

    2012-12-21

    The discovery of TeV γ-ray emission of BL Lac objects gave new insights in the particle acceleration and the emission processes of the highly relativistic jets. To shed light on the conditions in the high energetic jets of the TeV γ-ray emitting BL Lac objects, I have studied in great detail the spectral energy distribution (SED) of sources with different characteristics. BL Lac objects with exceptional very high energy spectra (soft and hard spectra) and with large differences in the emission peak frequencies, to cover the different classes of BL Lac objects, have been chosen. The basic aim of this thesis was, to study with new, simultaneous multi- avelength (MWL) observations, if the emission processes of these extreme cases of TeV BL Lac objects can be explained by the synchrotron Self-Compton (SSC) model which is well established for the class of BL Lac objects at lower energies. We proposed MWL observations in the optical, UV and X-ray regime, to be conducted simultaneous to very high energy observations with the H.E.S.S. experiment, to study the emission processes. Simultaneous observations are crucial, since BL Lac objects are variable at all wavebands. I have analysed the MWL observations and conducted detailed variability and spectral studies in each wavelength range. The different kind of absorption at each wavelength as well as the influence of the host galaxy of the AGN has been considered to obtain the intrinsic jet spectrum. I have then applied the commonly used theoretical jet model, the SSC model, to the SED. I conducted a MWL campaign on a BL Lac object with the softest TeV spectrum, PKS 2005-489, during which it was observed in a very bright X-ray state. The good spectral coverage of the emission peaks allowed a detailed study of the SSC model. The extreme BL Lac object 1ES 0229+200 exhibits a hard intrinsic TeV spectrum. With my MWL campaign I found a clear cut-off in the optical range and therefore a high minimum Lorentz factor is needed to

  16. Multi-wavelength studies of TeV γ-ray emitting BL Lac objects

    International Nuclear Information System (INIS)

    Kaufmann, Sarah Sabine

    2012-01-01

    The discovery of TeV γ-ray emission of BL Lac objects gave new insights in the particle acceleration and the emission processes of the highly relativistic jets. To shed light on the conditions in the high energetic jets of the TeV γ-ray emitting BL Lac objects, I have studied in great detail the spectral energy distribution (SED) of sources with different characteristics. BL Lac objects with exceptional very high energy spectra (soft and hard spectra) and with large differences in the emission peak frequencies, to cover the different classes of BL Lac objects, have been chosen. The basic aim of this thesis was, to study with new, simultaneous multi- avelength (MWL) observations, if the emission processes of these extreme cases of TeV BL Lac objects can be explained by the synchrotron Self-Compton (SSC) model which is well established for the class of BL Lac objects at lower energies. We proposed MWL observations in the optical, UV and X-ray regime, to be conducted simultaneous to very high energy observations with the H.E.S.S. experiment, to study the emission processes. Simultaneous observations are crucial, since BL Lac objects are variable at all wavebands. I have analysed the MWL observations and conducted detailed variability and spectral studies in each wavelength range. The different kind of absorption at each wavelength as well as the influence of the host galaxy of the AGN has been considered to obtain the intrinsic jet spectrum. I have then applied the commonly used theoretical jet model, the SSC model, to the SED. I conducted a MWL campaign on a BL Lac object with the softest TeV spectrum, PKS 2005-489, during which it was observed in a very bright X-ray state. The good spectral coverage of the emission peaks allowed a detailed study of the SSC model. The extreme BL Lac object 1ES 0229+200 exhibits a hard intrinsic TeV spectrum. With my MWL campaign I found a clear cut-off in the optical range and therefore a high minimum Lorentz factor is needed to

  17. fibrosarcome du larynx

    African Journals Online (AJOL)

    pie du lit tumoral est employée comme complément thé- rapeutique [9] alors que la chimiothérapie est générale- ment indiquée dans les formes métastatiques. Le pronos- tic dépend essentiellement du degré de différentiation his- tologique. En fait, le fibrosarcome bien différencié est caractérisé par la fréquence de récidive ...

  18. du Chott Marouane

    African Journals Online (AJOL)

    plancton de 90 µm de vide de maille. Ils ont été conservés dans du formol à 5%. L'identification de l'espèce est basée sur des critères morphologiques [20]: la forme des furcas, les lobes frontaux des antennes des mâles, de l'organe copulateur (pénis) et du sac ovigère. Le comptage des soies furcales a été réalisé. L'étude ...

  19. Lysines 72, 80 and 213 and aspartic acid 210 of the Lactococcus lactis LacR repressor are involved in the response to the inducer tagatose-6-phosphate leading to induction of lac operon expression.

    Science.gov (United States)

    van Rooijen, R J; Dechering, K J; Niek, C; Wilmink, J; de Vos, W M

    1993-02-01

    Site-directed mutagenesis of the Lactococcus lactis lacR gene was performed to identify residues in the LacR repressor that are involved in the induction of lacABCDFEGX operon expression by tagatose-6-phosphate. A putative inducer binding domain located near the C-terminus was previously postulated based on homology studies with the Escherichia coli DeoR family of repressors, which all have a phosphorylated sugar as inducer. Residues within this domain and lysine residues that are charge conserved in the DeoR family were changed into alanine or arginine. The production of the LacR mutants K72A, K80A, K80R, D210A, K213A and K213R in the LacR-deficient L.lactis strain NZ3015 resulted in repressed phospho-beta-galactosidase (LacG) activities and decreased growth rates on lactose. Gel mobility shift assays showed that the complex between a DNA fragment carrying the lac operators and LacR mutants K72A, K80A, K213A and D210A did not dissociate in the presence of tagatose-6-phosphate, in contrast to wild type LacR. Other mutations (K62A/K63A, K72R, K73A, K73R, T212A, F214R, R216R and R216K) exhibited no gross effects on inducer response. The results strongly suggest that the lysines at positions 72, 80 and 213 and aspartic acid at position 210 are involved in the induction of lac operon expression by tagatose-6-phosphate.

  20. PLACE DU MEDECIN GENERALISTE, EN FRANCE, DANS LE PARCOURS DE SOINS DES MALADIES CHRONIQUES

    Directory of Open Access Journals (Sweden)

    Claude JAFFIOL

    2017-05-01

    Full Text Available Les maladies chroniques sont la première cause de décès et la source principale des dépenses de santé. Leur dépistage précoce devrait permettre de limiter leur gravité évolutive et de réduire sensiblement leur coût.Le médecin généraliste est le mieux placé pour assurer la prise en charge de ces affections tout au long du parcours de soins. Mais plusieurs obstacles limitent cette évidence : la diminution régulière du nombre de praticiens de premier recours affectant de nombreux bassins de santé en France,  mais aussi, pour ceux en activité, des difficultés tenant au manque de formation, de temps médical et à une rémunération inadaptée à la prise en charge de ces pathologies. De ce fait, la prévention des maladies chroniques est insuffisante, leur diagnostic souvent trop tardif,  tandis que leur suivi se heurte au défaut d’observance du traitement par le patient et, plus rarement, à l’inertie thérapeutique médicale.   C'est pourquoi, il faut revoir fondamentalement la prise en charge des patients  pour les rendre autonomes dans la gestion de leur affection tout en donnant au praticien les moyens de gérer et de coordonner efficacement les diverses étapes du parcours de soin. Cela exige de changer les mentalités de part et d'autre, mais aussi de donner au médecin les moyens financiers lui permettant de consacrer à ses patients plus de temps, au centre d'une nouvelle organisation interprofessionnelle. La prévention et l’éducation thérapeutique du patient (ETP sont les clés de cette révolution thérapeutique. Il convient, en outre,  de revoir la formation des étudiants en privilégiant les sciences humaines et les stages chez le praticien, en favorisant  un accès accru au numérique et en assurant la reconnaissance, par des mesures concrètes, de la place du médecin généraliste dans un nouveau parcours de soins où il doit avoir un rôle central de coordinateur.

  1. Métallogénie du gîte à PB-ZN-AG de Nicholas-Denys, Nouveau-Brunswick

    OpenAIRE

    Deakin, Michelle Kyle

    2011-01-01

    Le gîte à Pb–Zn–Ag de Nicholas-Denys, dans le camp minier de Bathurst (Nouveau-Brunswick), est constitué de plusieurs lentilles à pyrrhotite–sphalérite–galène, encaissées par le mudstone de la Formation de Millstream du Groupe de Fournier, déposé dans un bassin d’arrière-arc ordovicien. Les lentilles de sulfures sont concordantes avec la foliation régional S1, et sont boudinées parallèlement à la faille de Rocky-Brook Millstream, indiquant que les sulfures prédatent la déformation décrochante...

  2. Bioécologie des Coléoptères (Arthropodes- Insectes) du marais salé de l‘embouchure de la Tafna (Tlemcen).

    OpenAIRE

    BOUKLI HACENE, Samira

    2014-01-01

    Le marais salé de l‘embouchure de la Tafna présente plusieurs originalités liées, d‘une part à sa situation naturelle en tant que zone éponge de la zone d‘estuaire du bassin versant de la Tafna et d‘autre part à son état perturbé engendré par une action anthropique intense (mise en place de l‘usine d‘aquaculture et agriculture). L‘hydrologie de surface a révélé des niveaux de submersion différents, ainsi le marais est soumis à des inondations fréquentes déterminant une unité de...

  3. Caractérisation isotopique des eaux du granite et de l’auréole métamorphique d’Oulmès (Maroc central)

    OpenAIRE

    Olive, Philippe; Dassargues, Alain; Griere, Olivier; Ruthy, Ingrid; El Youbi, A.

    2006-01-01

    Dans le bassin d’Oulmès sont exploitées et commercialisées par la société des Eaux Minérales d’Oulmès qui constitue le plus gros embouteilleur d’eaux minérales du Maroc :Sidi Ali Lala Haya. Le pluton granitique, d’âge hercynien, d’Oulmès est un granite à biotite et muscovite. Il présente une fracturation très marquée et un système filonien très développé. L’altération, très poussée, se manifeste par une arénitisation généralisée qui s’étend en profondeur. Le kaolin caractérise cette altér...

  4. Genèse d'un horizon tacheté par déferruginisation dans une couverture à latérite du Bassin amazonien

    Science.gov (United States)

    Rosolen, Vania; Lamotte, Mathieu; Boulet, René; Trichet, Jean; Rouer, Olivier; José Melfi, Adolpho

    A mottled horizon in a laterite cover (without any duricrust) was studied by microscopy and quantitative chemical microanalysis. Apart from the voids, light red spots consisting of Fe-rich particles (≈2 μm) are set in clayey plasma. Dark red spots consisted of concentrations of Fe-rich particles. These patterns are inherited. On the border of structural or biological voids, where Fe-depletion features are systematic, gray or yellow spots result from dissolution of the Fe-rich particles and impregnation of the plasma by iron, respectively. The present Fe-depletion is the dominant process that explains the mottled differentiation and the absence of lateritic duricrust. To cite this article: V. Rosolen et al., C. R. Geoscience 334 (2002) 187-195.

  5. De la parcelle au bassin versant : quelles données pour la modélisation du transfert des pesticides ?

    OpenAIRE

    Queyrel, Wilfried; Schott, Céline; Habets, Florence; Ripoche, Dominique; Launay, Marie; Tallec, Gaëlle; Ansart , P.; Blanchoud, Hélène

    2015-01-01

    La Directive Cadre sur l'Eau suppose la mise en œuvre par les pays membres de l'union européenne de la préservation ou la restauration d'une eau de "bonne qualité" pour les grandes masses d'eau. Cependant, les études réalisées sur le transfert des pesticides restent encore insuffisantes pour évaluer la vulnérabilité des eaux de surface et souterraines. La difficulté réside dans la diversité des molécules utilisées et de leurs propriétés physico-chimiques qui imposent que chaque substance acti...

  6. LES FACTEURS NATURELS ET LE FORÇAGE ANTHROPIQUE DES INONDATIONS EN ZONE SAHELIENNE DANS LE BASSIN DU NIGER AU BENIN (AFRIQUE DE L’OUEST

    Directory of Open Access Journals (Sweden)

    Michel BOKO

    2017-05-01

    Full Text Available It is noticed that from 1954 to 1984; the curve of water flow height is below that of discharge but there was no flooding. By cons, from 1985 to 2013, this curve is above that of water levels and floods are recorded in this period. It is concluded that of the 60 years, there has been a decrease in river flows and increase in the corresponding water levels. Flooding events recorded during last decades in Malaville and Karimama districts could be explained by a combination of different natural and man-made factors in Niger River watershed and in Malaville and Karimama districts Population growth has caused an expansion of cultivated areas, denudation of the banks with the resultant heavy erosion and filling of the main river bottom. The consequences of the reduction in the duration of the rainy season without a significant reduction in rainfall totals were amplified by anthropogenic forcing.

  7. Quelles sont les causes de la déforestation dans le bassin du Congo ? Synthèse bibliographique et études de cas

    Directory of Open Access Journals (Sweden)

    Gillet, P.

    2016-01-01

    Full Text Available Drivers of deforestation in the Congo basin tropical forest. A review. Description of the subject. The forests of the Congo Basin are among the best preserved areas on Earth. Nevertheless, the factors causing deforestation around the world are also present in this subregion. This document presents a literature review of the direct causes and underlying factors of deforestation in the tropical areas and highlights the drivers of deforestation in the Congo Basin and particularly in Cameroon and Gabon. Literature. Direct causes of deforestation, defined as having a direct cause-and-consequence connection with the destruction of forest cover, are underpinned by economic factors, technological developments, pro-deforestation policy measures and demographic pressures. These factors interact in different ways in the various tropical regions worldwide, which explains the differences and similarities of regional deforestation dynamics. Beside the expansion of infrastructure, the development of mining and timber extraction, agriculture is the main direct cause of deforestation in the Congo Basin. In Cameroon, the current deforestation is primarily driven by agriculture. The State emergency plan includes the development of infrastructure, the modernization of production, equipment and mining. The lack of strategy for rapidly changing demographics might be the most important underlying cause of deforestation. In Gabon, although the deforestation rate is low, agriculture and the opening of roads are main drivers. The emergency plan includes modernization of infrastructure and the development of agro-industrial agriculture. Conclusions. A mutation of socio-ecosystems is expected in different parts of the Congo Basin. Future research should now turn to the analysis of socio-ecosystems representative of the various stages of the forest transition and identify drivers of change at different scales.

  8. Actual situation and energy perspectives in the Mediterranean Sea Basin countries; Situation actuelle et perspectives energetiques dans les pays du bassin mediterraneen

    Energy Technology Data Exchange (ETDEWEB)

    Benghanem, A. [Societe Nationale d' Electricite et de Gaz d' Algerie, Alger (Algeria)

    2001-03-01

    An examination of the situation in the Mediterranean countries indicates that the demand for energy will surge to more than 1100 million tonnes of petroleum equivalent in 2010, an increase from the 800 million of tonnes of petroleum equivalent in 1998. The supply of primary energy is mainly provided by Algeria, Egypt, and Lybia. The challenge is to ensure the long-term stability of the energy exchanges between producing countries and their customers. In this regard, the Maghreb countries are in a favorable position, where the distribution systems are fairly well developed. The power distribution systems between these countries are interconnected (in addition to Morocco-Spain), and there are pipelines connecting Algeria-Tunisia-Italy, and Algeria-Morocco-Spain which reinforce the cooperation efforts. Other projects are in the planning stages to interconnect Algeria-Spain, Algeria-Sardinia-Italy, and Lybia-Italy. The policies in place in the countries located south of the Mediterranean Sea vary somewhat. In Morocco, an institutional reform of the electricity sector took place in 1995, where electricity production was effected in partnerships rather than being through leases. Tunisia opted for a more radical approach with the Build-Own-Operate (BOO). Algeria aims at reforming regulations concerning electricity, gas and hydrocarbons distribution in an attempt to introduce competitiveness and favor foreign investments. Lybia is considering a reorganization of its electricity sector towards the implementation of market openness. Egypt implemented a vast program of Independent Energy Producers. Turkey adopted the Build-Operate-Transfer (BOT) approach to electricity. South of the Mediterranean Sea, private electricity production is already a reality. The author briefly described the situation in Algeria in greater detail. 2 figs.

  9. Contribution de la gravimétrie à l'étude de la structure du bassin de Tadla (Maroc) : Implications hydrogéologiques

    Science.gov (United States)

    Najine, Abdessamad; Jaffal, Mohammed; Khammari, Kamal El; Aïfa, Tahar; Khattach, Driss; Himi, Mahjoub; Casas, Albert; Badrane, Said; Aqil, Hicham

    2006-08-01

    This study is based on the analysis and the interpretation of the gravity data of the Tadla basin. Its purpose is to increase the knowledge of this basin structure. A residual anomaly map was first calculated from the Bouguer anomaly data witch are strongly affected by a regional gradient. The computed map provides information on the ground density variation but it does not bring enough of new elements. Data filtering allows us to emphasize the structures affecting the basin. We chose the horizontal gradient coupled to the upward continuation techniques that permit to highlight news structures and to give information on their dip. The elaborated structural map of the study area constitutes a useful document for rationalizing the future groundwater exploration in the Tadla basin. To cite this article: A. Najine et al., C. R. Geoscience 338 (2006).

  10. L'aquifère du bassin de la Mamora, Maroc: geometrie et ecoulements souterrainsThe aquifer of the Mamora Basin, Morocco: geometry and groundwater flow

    Science.gov (United States)

    Zouhri, L.

    2001-05-01

    The Mamora aquifer, in the northern Moroccan Meseta, constitutes the main regional water resource. Its impermeable basement is mostly composed of blue marls. The lithostratigraphy of the basin aquifer is characterised by a sequence of sandstones, sandy limestones, conglomerates and sandy clays. The structure of the basement of the Mamora aquifer, deduced from electrical resistivity measurements, allowed the hydrogeological behaviour of the reservoir, and the direction of the groundwater flow, to be established. The combination of the lithological, morphological, piezometric, geophysical and structural investigations revealed a northward thickening of the substrate with groundwater flow towards the Rharb (to the north) and towards the Atlantic Ocean (northwest). This 'multicriteria' approach enabled a structural model to be defined, which correlated well with the aquifer geometry and the groundwater flow. The variability of the hydrogeological units, and the northward thickening of the sedimentary facies, were controlled by northeast-southwest orientated faults, which affect their impermeability.

  11. Apport de la gravimétrie à l'étude de la structure du bassin des Triffa (Maroc nord-oriental) : implications hydrogéologiques

    Science.gov (United States)

    Khattach, Driss; Keating, Pierre; Mili, El Mostafa; Chennouf, Touria; Andrieux, Pierre; Milhi, Abdellah

    2004-12-01

    Various techniques (horizontal and vertical derivatives, upward continuation, Euler deconvolution) have been applied to the gravity data from the Triffa's plain and the north flank of the Beni-Snassen massif to delineate various major geological structures such as faults and basins. These results allow the production of a structural map showing the fault systems for the survey area. This map forms the basis for planning future hydrogeological research in this region. To cite this article: D. Khattach et al., C. R. Geoscience 336 (2004).

  12. Manuel de référence pour l'installation de dispositifs permanents en forêt de production dans le Bassin du Congo

    OpenAIRE

    Picard , Nicolas; Gourlet-Fleury , Sylvie

    2008-01-01

    La réforme des codes forestiers des États d'Afrique Centrale entreprise entre 1994 et 2002 a généralisé la mise en place des plans d'aménagement. L'élaboration de ces plans nécessite des connaissances sur la dynamique des populations d'arbres et des peuplements forestiers, avant et après exploitation. Les dispositifs permanents, dans lesquels les arbres sont suivis de manière individuelle à intervalles de temps réguliers, permettent de répondre à cette préoccupation en fournissant les paramèt...

  13. Dynamique de la flore et de la végétation des Niayes et du Bassin arachidier au Sénégal

    Directory of Open Access Journals (Sweden)

    Elhadji Faye

    2014-12-01

    Full Text Available Reactualisation of floristic and phytosociologic datas in Niayes and Peanut-Basin areas were undertook with village scale approach to better underline resources' conervation. In Savannah and sub-guinean areas specially in the Peanut-Basin and Niayes, 288 floristic samples were put in place in 6 villages in an stratified way based on ethnic groups, land use systems and topography. In the same time, 25 samples were realised in the 2 reference sites (Noflaye and Sambandé and comparison were made with researches conducted in 1940. Datas were submitted to multivariate analysis. SØrensen similarity index were used to compare villages systems and natural sites. Results showed discrimination of 11 phytosociologic groups: 5 of which came from natural sites (savanah G4 Hexalobus monopetalus et Gardenia ternifolia and G8 Acacia macrostachya et Ischaemum rugosum, secondary forest G10 Aphania senegalensis et Voaganca africana, semi-aquatic vegetations G1 Ipomoea aquatica et I. dichroa and G5 Phragmites australis subsp australis et Paspalum vaginatum and 6 from anthropic systems (disturbed areas G6 Echinochloa colona et Jussiae erecta and G7 Dactyloctenium aegyptium et Brachiaria disticophylla, and finally post-cultural zones with G2 Brachiaria disticophylla et Cenchrus biflorus, G3 Celosia trigyna et Digitaria velutina, G9 Tephrosia purpurea et Cenchrus biflorus and G11 Mitracarpus scaber et Eragrostis tremula. Natural sites groups were progressively invided by disturded area species and the others by ruderals and nitrophyl species. Overall floristic richness is about 336 species among which 260 from the Niayes sites and 176 from Peanut-Basin ones. References sites are always richer in terms af genera but peul areas are richer in termes of species. Differences were evidenced between actual taxa and Trochain (1940 descriptions. This methodological approach might be extended to other ecogeographical zones in Senegal in order to better identify and follow phyotosociologic groups dynamics and facilitate their integration in modern classification. Keywords : Senegal, flora, phytosociology groups, dynamics.

  14. Contribution { l’étude et { la cartographie des zones sensibles { l’érosion hydrique du sous bassin versant de Oued Saida

    OpenAIRE

    REMMAS, HICHEME

    2014-01-01

    الح ضٌ المائ ل اٌدي سع ذٍج ى جسء من الح ضٌ المائ للمقطع، رٌم سٍ تمناخ شثو جاف، امطار غ رٍ منرظمح على مذار السنح مع جً دٌ ضغ طٌاخ انسان حٍ حً اٌٍن حٍ ف نفس ال قٌد ) قطع الاشجار الغات حٍ، الر سٌع العمران اًلرع المكثف مسثثرا للانجراف الشذ ذٌ للررتح، فًقا لل كٌالح ال طٌن حٍ للم اٌرد المائ حٍ قٌذر كم حٍ الر اًسة الناذجح عن انجراف الررتح ب 22766 طن/سنح مساىمح تذالك ف نقص نسثح الم اٍه ف سذ سًٌرخ. اجر نٌا ىذه الذراسح تاسرخذام نضام المعل مٌاخ الجغراف حٍ اًلر سمحد لنا تاسرخراج خر طٌح اصطناع...

  15. Study of the Ouarzazate basin structure by seismic reflection: hydrogeological implications; Etude de la structure du bassin d'Ouarzazate par sismique reflexion: Implications hydrogeologiques

    Energy Technology Data Exchange (ETDEWEB)

    Boummane, Kh.; Jaffal, M.; Kchikach, A.

    2009-07-01

    A large number of seismic reflection lines have been carried out in the Ouarzazate basin by the oil industry. The present study is concerned with the interpretation of a part of these data in order to characterize the structure of the Eocene aquifer system. The reflector corresponding to the base of this system, made up of sandstone and limestone, was first identified then digitized on each time-migrated seismic section. An isochrone map of this reflector was realized. The analysis of this map shows that the area under study is subdivided into two structurally contrasted domains. The first, the northern one, is intensively deformed; while the second, the southern one, is slightly folded. The results of this study provide a better understanding of the deep geological structure of the Ouarzazate basin. This allows us to better comprehend the functioning of the Eocene aquifer system, and to rationalize the future potential underground water exploration in the Ouarzazate basin. (Author) 16 refs.

  16. Carboniferous bioconstructions of the Bechar Basin, Algerian Sahara: Sedimentology, diagenesis, and petroleum potential. Les bioconstructions carboniferes du Bassin de Bechar, Sahara algerien: Sedimentologie, diagenese et potentiel petrolifere

    Energy Technology Data Exchange (ETDEWEB)

    Madi, A.

    1994-01-01

    Carbonate massifs which surface on the northwest of the Bechar Basin in the Algerian Sahara are studied, in particular the lithostratigraphic section of the upper Visean of the Grand Erg Occidental. The latter corresponds to a succession of 13 shallowing-upward parasequences. An ideal parasequence comprises a massive biohermal assemblage, constructed by the association of Fenestelles and sponges, buried under strata of crinoidal and/or oolithic grainstones. The vertical distribution of the microflora within the facies translates into a zonation as function of depth. An idealized ecological succession formed from seven benthic assemblages is proposed. Diagenetic analysis of the studied sequences has revealed nine diagenetic phases corresponding to six calcitic cements, two dolomitization phases, and one of silicification. Most of these diagenetic events were produced in medium to deep burial, after 650 m. The stratified oolithic-crinoidal carbonates could have served as reservoir rocks if trapping conditions were present. A hypothesis has been formed according to which the porous strata formed natural conduits on a regional scale and three trapping possibilities are proposed. These models, which integrate all the parameters which influence the existence of a petroleum deposit, could contribute to the establishment of an exploration strategy for the Bechar Basin Carboniferous carbonate strata. 146 refs., 61 figs., 29 tabs.

  17. The LAC Test: A New Look at Auditory Conceptualization and Literacy Development K-12.

    Science.gov (United States)

    Lindamood, Charles; And Others

    The Lindamood Auditory Conceptualization (LAC) Test was constructed with the recognition that the process of decoding involves an integration of the auditory, visual, and motor senses. Requiring the manipulation of colored blocks to indicate conceptualization of test patterns spoken by the examiner, subtest 1 entails coding of identity, number,…

  18. Dynamical Black Hole Masses of BL Lac Objects from the Sloan Digital Sky Survey

    NARCIS (Netherlands)

    Plotkin, Richard M.; Markoff, Sera; Trager, Scott C.; Anderson, Scott F.

    2012-01-01

    We measure black hole masses for 71 BL Lac objects from the Sloan Digital Sky Survey (SDSS) with redshifts out to z ∼ 0.4. We perform spectral decompositions of their nuclei from their host galaxies and measure their stellar velocity dispersions. Black hole masses are then derived from the black

  19. Absorption in the spectra of quasi stellar objects and BL Lac objects

    International Nuclear Information System (INIS)

    Perry, J.J.; Burbidge, E.M.; Burbidge, G.R.

    1978-06-01

    An extensive review is given of the observations of absorption in the spectra of QSOs and BL Lac objects. In Table Ia we summarize all of the information available up to May 1, 1978 on objects which show absorption. Following discussion of the observations in Section II, possible interpretations are critically discussed. (orig.) [de

  20. Exploring the sequence-function relationship in transcriptional regulation by the lac O1 operator.

    Science.gov (United States)

    Maity, Tuhin S; Jha, Ramesh K; Strauss, Charlie E M; Dunbar, John

    2012-07-01

    Understanding how binding of a transcription factor to an operator is influenced by the operator sequence is an ongoing quest. It facilitates discovery of alternative binding sites as well as tuning of transcriptional regulation. We investigated the behavior of the Escherichia coli Lac repressor (LacI) protein with a large set of lac O(1) operator variants. The 114 variants examined contained a mean of 2.9 (range 0-4) mutations at positions -4, -2, +2 and +4 in the minimally required 17 bp operator. The relative affinity of LacI for the operators was examined by quantifying expression of a GFP reporter gene and Rosetta structural modeling. The combinations of mutations in the operator sequence created a wide range of regulatory behaviors. We observed variations in the GFP fluorescent signal among the operator variants of more than an order of magnitude under both uninduced and induced conditions. We found that a single nucleotide change may result in changes of up to six- and 12-fold in uninduced and induced GFP signals, respectively. Among the four positions mutated, we found that nucleotide G at position -4 is strongly correlated with strong repression. By Rosetta modeling, we found a significant correlation between the calculated binding energy and the experimentally observed transcriptional repression strength for many operators. However, exceptions were also observed, underscoring the necessity for further improvement in biophysical models of protein-DNA interactions. © 2012 The Authors Journal compilation © 2012 FEBS.

  1. Transformation of lacZ using different promoters in the commercially ...

    African Journals Online (AJOL)

    Yomi

    2012-01-26

    Jan 26, 2012 ... forced growth under unnatural conditions. In order to ... yezoensis include the gluc, cat, GUS and GFP genes. (Cheney et al. ... bacterial lacZ gene encodes the β-galactosidase enzyme which is capable of .... Table 1. Effect of viral promoters on transient β-galactosidase activity in microparticle bombarded G.

  2. 77 FR 27245 - Big Stone National Wildlife Refuge, Big Stone and Lac Qui Parle Counties, MN

    Science.gov (United States)

    2012-05-09

    ... DEPARTMENT OF THE INTERIOR Fish and Wildlife Service [FWS-R3-R-2012-N069; FXRS1265030000S3-123-FF03R06000] Big Stone National Wildlife Refuge, Big Stone and Lac Qui Parle Counties, MN AGENCY: Fish and... plan (CCP) and environmental assessment (EA) for Big Stone National Wildlife Refuge (Refuge, NWR) for...

  3. Influence of salt content and processing time on sensory characteristics of cooked "lacón".

    Science.gov (United States)

    Purriños, Laura; Bermúdez, Roberto; Temperán, Sara; Franco, Daniel; Carballo, Javier; Lorenzo, José M

    2011-04-01

    The influence of salt content and processing time on the sensory properties of cooked "lacón" were determined. "Lacón" is a traditional dry-cured and ripened meat product made in the north-west of Spain from the fore leg of the pig, following a similar process to that of dry-cured ham. Six batches of "lacón" were salted with different amounts of salt (LS (3 days of salting), MS (4 days of salting) and HS (5 days of salting)) and ripened during two times (56 and 84 days of dry-ripening). Cured odour in all batches studied, red colour and rancid odour in MS and HS batches, flavour intensity in MS batch and fat yellowness, rancid flavour and hardness in the HS batch were significantly different with respect to the time of processing. Appearance, odour, flavour and texture were not significantly affected by the salt content (P>0.05). However, the saltiness score showed significant differences with respect to the salt levels in all studied batches (56 and 84 days of process). The principal component analysis showed that physicochemical traits were the most important ones concerning the quality of dry-cured "lacón" and offered a good separation of the mean samples according to the dry ripening days and salt level. © 2010 The American Meat Science Association. Published by Elsevier Ltd. All rights reserved.

  4. Kinetic Analysis of Lactose Exchange in Proteoliposomes Reconstituted with Purified lac Permease

    NARCIS (Netherlands)

    Lolkema, Julius S.; Carrasco, Nancy; Kaback, H. Ronald

    1991-01-01

    Lactose exchange catalyzed by purified lac permease reconstituted into proteoliposomes was analyzed with unequal concentrations of lactose on either side of the membrane and at low pH so as to prevent equilibration of the two pools. Exchange with external concentrations below 1.0 mM is a

  5. Computing Optical Variable Periods of BL Lac Object S5 0716+714 ...

    Indian Academy of Sciences (India)

    2016-01-27

    Jan 27, 2016 ... From a large volume of literature, we have collected effective observation of BL Lac object S5 0716+714 in the optical band, and constructed its long-term light curve from 1994 to 2006 AD. The light curve shows that S5 0716+714 is very active and exhibits very complicated non-sinusoidal variations.

  6. : tous les projets | Page 382 | CRDI - Centre de recherches pour le ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Programme: Gouvernance et justice. Financement total : CA$ 213,300.00. Gestion axée sur la demande en vue de l'adaptation à la rareté de l'eau et aux changements climatiques dans le bassin du Saïss (Maroc). Projet. Le bassin du Saïss est un sous-bassin versant du bassin du Sebou, situé dans le nord du Maroc.

  7. La croissance de la truite commune (Salmo trutta L. sur le bassin de Scorff

    Directory of Open Access Journals (Sweden)

    BAGLINIÈRE J. L.

    1990-07-01

    Full Text Available La croissance de la truite commune (Salmo trutta L. a été étudiée à partir du suivi de cinq cohortes âgées de 0 - à 2 - ans dans quatre milieux différents (Scorff aval et amont, affluent, sous-affluent. D'une manière générale, la taille destruites quelque soit leur âge diminue de l'aval vers l'amont du Scorff et de la rivière à l'affluent et au sous-affluent. Le taux mensuel de croissance G = 2,85 (LnL2 — LnL1/(T2 — T1 diminue de la première à la troisième année de vie quelque soit l'ordre de drainage. Ce taux de croissance varie suivant le milieu pour les deux premières classes d'âge (0 + et 1 +, cet effet milieu étant relié à la densité de population pour les individus 0 +. Le taux de croissance varie également suivant les années mais uniquement chez les plus jeunes truites et cet effet année est relié principalement à la température de l'eau. Un modèle de Von Bertalanffy est proposé pour décrire la relation entre la taille (Lf et la somme des températures moyennes journalières depuis la date moyenne d'émergence (Tmjpendant la première année : Lf = 106,7 (1 — exp [ — 0,0005 (Tmj + 468]. Les résultats sont discutés et permettent de dégager les faits majeurs intervenant sur la croissance de la truite tout au long d'un cycle jusqu'à la maturation sexuelle. Mots-clés : Température - Croissance - Truite commune - Rivière - France.

  8. les cahiers du cread

    African Journals Online (AJOL)

    Our Journal “les cahiers du cread” is a quarterly economic review publishing original findings of empirical research and theoretical debates on fields pertaining to our mission coverage (Macro Economics, Industrial Economics and Firms, Human Development & Social Economics, Agriculture & Environment). Other websites ...

  9. THE CONTRIBUTION OF FERMI -2LAC BLAZARS TO DIFFUSE TEV–PEV NEUTRINO FLUX

    Energy Technology Data Exchange (ETDEWEB)

    Aartsen, M. G. [Department of Physics, University of Adelaide, Adelaide, 5005 (Australia); Abraham, K. [Physik-department, Technische Universität München, D-85748 Garching (Germany); Ackermann, M. [DESY, D-15735 Zeuthen (Germany); Adams, J. [Dept. of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch (New Zealand); Aguilar, J. A.; Ansseau, I. [Université Libre de Bruxelles, Science Faculty CP230, B-1050 Brussels (Belgium); Ahlers, M. [Dept. of Physics and Wisconsin IceCube Particle Astrophysics Center, University of Wisconsin, Madison, WI 53706 (United States); Ahrens, M. [Oskar Klein Centre and Dept. of Physics, Stockholm University, SE-10691 Stockholm (Sweden); Altmann, D.; Anton, G. [Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91058 Erlangen (Germany); Andeen, K. [Department of Physics, Marquette University, Milwaukee, WI, 53201 (United States); Anderson, T.; Arlen, T. C. [Dept. of Physics, Pennsylvania State University, University Park, PA 16802 (United States); Archinger, M.; Baum, V. [Institute of Physics, University of Mainz, Staudinger Weg 7, D-55099 Mainz (Germany); Arguelles, C.; Axani, S. [Dept. of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139 (United States); Auffenberg, J. [III. Physikalisches Institut, RWTH Aachen University, D-52056 Aachen (Germany); Bai, X. [Physics Department, South Dakota School of Mines and Technology, Rapid City, SD 57701 (United States); Barwick, S. W., E-mail: thorsten.gluesenkamp@fau.de [Dept. of Physics and Astronomy, University of California, Irvine, CA 92697 (United States); Collaboration: IceCube Collaboration; and others

    2017-01-20

    The recent discovery of a diffuse cosmic neutrino flux extending up to PeV energies raises the question of which astrophysical sources generate this signal. Blazars are one class of extragalactic sources which may produce such high-energy neutrinos. We present a likelihood analysis searching for cumulative neutrino emission from blazars in the 2nd Fermi -LAT AGN catalog (2LAC) using IceCube neutrino data set 2009-12, which was optimized for the detection of individual sources. In contrast to those in previous searches with IceCube, the populations investigated contain up to hundreds of sources, the largest one being the entire blazar sample in the 2LAC catalog. No significant excess is observed, and upper limits for the cumulative flux from these populations are obtained. These constrain the maximum contribution of 2LAC blazars to the observed astrophysical neutrino flux to 27% or less between around 10 TeV and 2 PeV, assuming the equipartition of flavors on Earth and a single power-law spectrum with a spectral index of −2.5. We can still exclude the fact that 2LAC blazars (and their subpopulations) emit more than 50% of the observed neutrinos up to a spectral index as hard as −2.2 in the same energy range. Our result takes into account the fact that the neutrino source count distribution is unknown, and it does not assume strict proportionality of the neutrino flux to the measured 2LAC γ -ray signal for each source. Additionally, we constrain recent models for neutrino emission by blazars.

  10. VizieR Online Data Catalog: The CLASS BL Lac sample (Marcha+, 2013)

    Science.gov (United States)

    Marcha, M. J. M.; Caccianiga, A.

    2014-04-01

    This paper presents a new sample of BL Lac objects selected from a deep (30mJy) radio survey of flat spectrum radio sources (the CLASS blazar survey). The sample is one of the largest well-defined samples in the low-power regime with a total of 130 sources of which 55 satisfy the 'classical' optical BL Lac selection criteria, and the rest have indistinguishable radio properties. The primary goal of this study is to establish the radio luminosity function (RLF) on firm statistical ground at low radio luminosities where previous samples have not been able to investigate. The gain of taking a peek at lower powers is the possibility to search for the flattening of the luminosity function which is a feature predicted by the beaming model but which has remained elusive to observational confirmation. In this study, we extend for the first time the BL Lac RLF down to very low radio powers ~1022W/Hz, i.e. two orders of magnitude below the RLF currently available in the literature. In the process, we confirm the importance of adopting a broader, and more physically meaningful set of classification criteria to avoid the systematic missing of low-luminosity BL Lacs. Thanks to the good statistics we confirm the existence of weak but significant positive cosmological evolution for the BL Lac population, and we detect, for the first time the flattening of the RLF at L~1025W/Hz in agreement with the predictions of the beaming model. (1 data file).

  11. Comparaison du filtre adaptatif RIF et du filtre a base de reseau de ...

    African Journals Online (AJOL)

    Comparaison du filtre adaptatif RIF et du filtre a base de reseau de neurones pour le filtrage du courant de reference pour la commande du filtre actif parallele. C Benachaiba, A Bassou, B Mazari ...

  12. Water quality and hydrology of the Lac Vieux Desert watershed, Gogebic County, Michigan, and Vilas County, Wisconsin, 2002-04

    Science.gov (United States)

    Weaver, T.L.; Neff, B.P.; Ellis, J.M.

    2005-01-01

    Lac Vieux Desert is a prominent 6.6 square-mile lake that straddles the Michigan-Wisconsin border and forms the headwaters of the Wisconsin River. For generations, the Lac Vieux Desert Band of Lake Superior Chippewa Indians have used Lac Vieux Desert and the surrounding area for growing and harvesting wild rice, and hunting and fishing. The Lac Vieux Desert Band is concerned about the impact of lake-stage regulation on hydrology and ecology, and the impact on water quality of development along and near the shore, and recreational watercraft use and sport fishing. In 2005, the U.S. Geological Survey completed a water-resources investigation of the Lac Vieux Desert watershed in cooperation with the Lac Vieux Desert Band of Lake Superior Chippewa Indians.Water quality of Lac Vieux Desert is typical of many lakes in the northern United States. Trophic State Index calculations classify Lac Vieux Desert as a highly productive eutrophic lake. The pH of water in Lac Vieux Desert ranged from 6.5 to 9.5, and specific conductance ranged from 62 to 114 µs/cm. Chloride concentration was less than 1.5 mg/L, indicating little effect from septic-tank or road-salt input. Results indicate that the water can be classified as soft, with hardness concentrations reported as calcium carbonate ranging from 29 to 49 mg/L. Concentrations of calcium, magnesium, chloride, and other dissolved solids ranged from 47 to 77 mg/L. Alkalinity of Lac Vieux Desert ranged from 27 to 38 mg/L.Pervasive aquatic blooms, including a bloom noted during the September 2003 sampling, are apparently common in late summer. Biological productivity at Lac Vieux Desert does not appear to have changed appreciably between 1973 and 2004. In the current study, total phosphorus concentrations ranged from 0.01 to 0.064 mg/L and dissolved nitrite plus nitrate nitrogen concentrations ranged from at, or below detection limit to 0.052 mg/L. Overabundance of nutrients in Lac Vieux Desert, particularly nitrogen and phosphorus

  13. Enzymatic Synthesis of N-Acetyllactosamine (LacNAc Type 1 Oligomers and Characterization as Multivalent Galectin Ligands

    Directory of Open Access Journals (Sweden)

    Thomas Fischöder

    2017-08-01

    Full Text Available Repeats of the disaccharide unit N-acetyllactosamine (LacNAc occur as type 1 (Galβ1, 3GlcNAc and type 2 (Galβ1, 4GlcNAc glycosylation motifs on glycoproteins and glycolipids. The LacNAc motif acts as binding ligand for lectins and is involved in many biological recognition events. To the best of our knowledge, we present, for the first time, the synthesis of LacNAc type 1 oligomers using recombinant β1,3-galactosyltransferase from Escherichia coli and β1,3-N-acetylglucosaminyltranferase from Helicobacter pylori. Tetrasaccharide glycans presenting LacNAc type 1 repeats or LacNAc type 1 at the reducing or non-reducing end, respectively, were conjugated to bovine serum albumin as a protein scaffold by squarate linker chemistry. The resulting multivalent LacNAc type 1 presenting neo-glycoproteins were further studied for specific binding of the tumor-associated human galectin 3 (Gal-3 and its truncated counterpart Gal-3∆ in an enzyme-linked lectin assay (ELLA. We observed a significantly increased affinity of Gal-3∆ towards the multivalent neo-glycoprotein presenting LacNAc type 1 repeating units. This is the first evidence for differences in glycan selectivity of Gal-3∆ and Gal-3 and may be further utilized for tracing Gal-3∆ during tumor progression and therapy.

  14. Production extensive de jeunes saumons atlantiques (Salmo salar L. d'un an dans l'étang du Boucheron (Corrèze

    Directory of Open Access Journals (Sweden)

    DUMAS J.

    1981-07-01

    Full Text Available Dans le cadre du plan de restauration du Saumon dans la Dordogne, un élevage extensif de tacons de repeuplement est expérimenté dans un étang de pénéplaine où des alevins de saumons ont été immergés. Pour une première année d'élevage, cette pièce d'eau a procuré 2 150 jeunes saumons d'un an d'une grande taille moyenne (13,1 cm pour 21,2 g. La proportion de saumoneaux (smolts y est très importante (80,3 %. La survie depuis la mise en charge est élevée (14,3 % comparée à celle observée dans les rivières à saumons. La densité du peuplement à la récolte est, par hectare, de 879 juvéniles pour un poids de 18,6 kg. Les nombreux plans d'eau sur le haut bassin de la Dordogne peuvent constituer à peu de frais un outil de production de jeunes saumons pour le repeuplement de cette rivière.

  15. Le ministre du Commerce international du Canada rencontre des ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    17 juil. 2017 ... La promotion de l'entrepreneuriat, la façon dont le commerce peut profiter aux femmes et à leur famille, et la création d'emplois pour les plus vulnérables étaient au coeur de la discussion en table ronde du ministre du Commerce international du Canada, l'honorable François-Philippe Champagne, et des ...

  16. Portage vaginal du streptocoque du groupe B chez la femme ...

    African Journals Online (AJOL)

    Introduction: le streptocoque du groupe B est le principal agent impliqué dans les infections materno-fœtales, les septicémies et les méningites du nouveau-né à terme. L'objectif est de déterminer le taux de portage maternel du streptocoque du groupe B (SGB) à terme. Méthodes: un prélèvement vaginal a été réalisé de ...

  17. USING THE METHODS OF WAVELET ANALYSIS AND SINGULAR SPECTRUM ANALYSIS IN THE STUDY OF RADIO SOURCE BL LAC

    OpenAIRE

    Donskykh, G. I.; Ryabov, M. I.; Sukharev, A. I.; Aller, M.

    2014-01-01

    We investigated the monitoring data of extragalactic source BL Lac. This monitoring was held withUniversityofMichigan26-meter radio  telescope. To study flux density of extragalactic source BL Lac at frequencies of 14.5, 8 and 4.8 GHz, the wavelet analysis and singular spectrum analysis were used. Calculating the integral wavelet spectra allowed revealing long-term  components  (~7-8 years) and short-term components (~ 1-4 years) in BL Lac. Studying of VLBI radio maps (by the program Mojave) ...

  18. Aux origines du monde

    CERN Multimedia

    2004-01-01

    "C'est l'histoire d'une aventure humaine, scientifique, international qui a vu le jour il y a cinquante ans, aux confins de la Suisse et du département de l'Ain. Le plus grand laboratoire de physique des particules du monde, le Cern, a été fondé en 1954. Les festivités organisées à l occasion de cet anniversaire connaîtront leur point d'orgue le 16 octobre prochain, avec portes-ouvertes, accueil de personallités et inauguration d'un monumnet spécifique, le Globe de l'innovation" (2 pages)

  19. CHOEUR DU CERN

    CERN Multimedia

    CHOEUR DU CERN

    2010-01-01

    Les répétitions du chœur du CERN reprendront le mercredi 15 septembre à 20.00 heures à l’amphithéâtre principal – bâtiment 500. Au programme la préparation de notre concert de Noël avec la Missa Brevis, KV115, de Léopold Mozart et de la musique de Noël d’Europe. Les personnes qui aiment chanter, notamment des sopranes et des ténors, sont les bienvenues. Pour tout contact s’adresser à : Baudouin Bleus - (tél.CERN 767 82 44) -(baudouin.bleus@cern.ch) ou Martin Gatehouse ( martin.gatehouse@wanadoo.fr) ou Jean-Paul Diss (jean-pauldiss@wanadoo.fr).  

  20. Hepatiques du Surinam

    NARCIS (Netherlands)

    Jovet-Ast, S.

    1957-01-01

    Il n’existe pas, actuellement, de catalogue des Hépatiques du Surinam. Les Hépatiques de ce pays restent très peu connues. Cependant, certaines ont attiré l’attention des Bryologues et ont été citées dans quelques ouvrages anciens ou récents. Je ne ferai pas ici une révision complète de ces

  1. (l.) Medik du Maroc

    African Journals Online (AJOL)

    PR BOKO

    Résumé. Dipcadi serotinum (L.) Medik, est une plante de la famille des Hyacinthaceae, elle est largement utilisée comme réchauffant et aussi pour combattre la jaunisse. Cette plante trouve une large utilisation par la population de la région côtière du Maroc. À notre connaissance l'huile essentielle de cette espèce n'a ...

  2. First Modelling Results of the EM Response of a CO2 Storage in the Paris Basin Premières modélisations de la réponse EM d’un stockage de CO2 dans le bassin Parisien

    Directory of Open Access Journals (Sweden)

    Bourgeois B.

    2010-07-01

    electriques/EM pour surveiller l’injection de CO2 supercritique a 1700 m de profondeur dans un aquifere salin du Bassin Parisien (Carbonates du Dogger. Nous demontrons d’abord l’interet theorique des methodes de resistivite pour une telle surveillance a l’aide des lois fondamentales de la petrophysique dans les roches sedimentaires poreuses, en supposant que le CO2 supercritique est un isolant parfait. Diverses combinaisons de sources et de capteurs sont discutees et il est conclu que le dispositif le plus performant consiste en une source de type galvanique (injection de courant dans le sol a l’aide d’unepaire d’electrodes A et B et d’une grille de capteurs electriques (et peut-etre magnetiques a la surface du sol. Compte tenu de la profondeur et de la finesse des couches reservoir, l’injection du courant en profondeur est envisagee dans le but d’augmenter la densite de courant circulant dans la couche reservoir. L’injection ponctuelle a la profondeur du reservoir, dans une configuration de type « Mise A la Masse » (MAM, etant generalement impossible a cause de la presence de tubages metalliques dans les forages, nous avons etudie la possibilite d’utiliser ces memes tubages comme des longues electrodes distribuant le courant tout le long du forage. Ce type de source est denomme « LEMAM » (Long Electrode Mise A la Masse, pour le distinguer du MAM conventionnel. Des simulations numeriques sont presentees a la fois pour le dispositif LEMAM et pour le dispositif « rectangle » (RECT, lequel emploie une injection de courant ponctuelle a la surface du sol. Le modele geoelectrique utilise est base sur une zone proche du champ petrolier de Saint-Martin-de-Bossenay (SMB, au sud-est du Bassin Parisien. La couche reservoir consideree dans cette etude est la formation de l’“ Oolithe Blanche ” (Dogger qui a une epaisseur de 75 m et se situe a une profondeur de 1700 m sous la surface du sol. Dans les modeles presentes, le panache de CO2 est simplifie en

  3. La mesure du danger

    CERN Document Server

    Manceron, Vanessa; Revet, Sandrine

    2014-01-01

    La mesure du danger permet d’explorer des dangers de nature aussi diverse que la délinquance, la pollution, l’écueil maritime, la maladie ou l’attaque sorcellaire, l’extinction d’espèces animales ou végétales, voire de la Planète tout entière. Au croisement de la sociologie, de l’anthropologie et de l’histoire, les différents articles analysent les pratiques concrètes de mesure pour tenter de comprendre ce qui se produit au cours de l’opération d’évaluation du danger sans préjuger de la nature de celui-ci. L’anthropologie a contribué à la réflexion sur l’infortune en s’intéressant aux temporalités de l’après : maladies, catastrophes, pandémies, etc. et en cherchant à rendre compte de l’expérience des victimes, de leur vie ordinaire bouleversée, de la recomposition du quotidien. Elle s’intéresse aussi aux autres types de mesures, les savoirs incorporés, qui reposent sur l’odorat, la vue ou le toucher et ceux qui ressortent d’une épistémologie « non ...

  4. X-ray emission from BL Lac objects: Comparison to the synchrotron self-Compton models

    International Nuclear Information System (INIS)

    Schwartz, D.A.; Madejski, G.; Ku, W.H.-M.

    1982-01-01

    As one part of our joint study of the X-ray properties of BL Lac objects, the authors compare the measured X-ray flux densities with those predicted using the synchrotron self-Compton (SSC) formalism (Jones et al. 1974). Naive application of the formalism predicts X-ray fluxes from 10 -3 to 10 5 those observed. They therefore ask what we can learn by simply assuming the SSC mechanism, and looking for ways to reconcile the observed and measured X-ray fluxes. This paper reports investigation of beaming factors due to relativistic ejection of a radiation source which is isotropic in its own rest frame. The authors conclude that large Lorentz factors, GAMMA approximately > 10, do not apply to BL Lac objects as a class. (Auth.)

  5. Search for relation between flares and photometric variability outside of flares in EV Lac

    International Nuclear Information System (INIS)

    Rojzman, G.Sh.

    1984-01-01

    The observations of the flare star EV Lac in July-September 1981 have confirmed the existence of photometric variability outside the flares during the night. It was found that, as a rule, a slow increase of brightness in U and B bands during 1-2 hours preceded the flares. It is suggested that the variability outside the flares is the result of the variability of chpomospheric emission lines and continuum that are emitted by the chromospheric preflare formations

  6. A source of artifact in the lacZ reversion assay in Escherichia coli.

    Science.gov (United States)

    Hoffmann, George R; Gray, Carol L; Lange, Paulina B; Marando, Christie I

    2015-06-01

    The lacZ reversion assay in Escherichia coli measures point mutations that occur by specific base substitutions and frameshift mutations. The tester strains cannot use lactose as a carbon source (Lac(-)), and revertants are easily detected by growth on lactose medium (Lac(+)). Six strains identify the six possible base substitutions, and five strains measure +G, -G, -CG, +A and -A frameshifts. Strong mutagens give dose-dependent increases in numbers of revertants per plate and revertant frequencies. Testing compounds that are arguably nonmutagens or weakly mutagenic, we often noted statistically significant dose-dependent increases in revertant frequency that were not accompanied by an absolute increase in numbers of revertants. The increase in frequency was wholly ascribable to a declining number of viable cells owing to toxicity. Analysis of the conditions revealed that the frequency of spontaneous revertants is higher when there are fewer viable cells per plate. The phenomenon resembles "adaptive" or "stress" mutagenesis, whereby lactose revertants accumulate in Lac(-) bacteria under starvation conditions in the absence of catabolite repression. Adaptive mutation is observed after long incubation and might be expected to be irrelevant in a standard assay using 48-h incubation. However, we found that elevated revertant frequencies occur under typical assay conditions when the bacterial lawn is thin, and this can cause increases in revertant frequency that mimic chemical mutagenesis when treatments are toxic but not mutagenic. Responses that resemble chemical mutagenesis were observed in the absence of mutagenic treatment in strains that revert by different frameshift mutations. The magnitude of the artifact is affected by cell density, dilution, culture age, incubation time, catabolite repression and the age and composition of media. Although the specific reversion assay is effective for quickly distinguishing classes of mutations induced by potent mutagens, its

  7. Archive of Geosample Data and Information from the University of Minnesota National Lacustrine Core Repository (LacCore)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The National Lacustrine Core Repository (LacCore), operated by the University of Minnesota is a partner in the Index to Marine and Lacustrine Geological Samples...

  8. The REX survey as a tool to test the beaming model for BL Lacs

    CERN Document Server

    Caccianiga, A; MacCacaro, T; Wolter, A; Gioia, I M

    1999-01-01

    In the context of the beaming model (BM) BL Lac and FR I radio galaxies are thought to be the same class of sources seen at different angles. If this picture is correct, we expect to find some transition objects with intermediate properties between the two classes. To date, this intermediate population of objects is missing, probably due to the limiting fluxes of the current X-ray/radio surveys and/or to the criteria used to separate BL Lacs from normal elliptical galaxies. As pointed out by Browne and Marcha (1993), the detection of the transition objects requires particular attention since the "weak" BL Lac nucleus is hidden by the light of the host elliptical galaxy. A useful criterion often used to assess the presence of a non-thermal source, in addition to the stellar emission of the host galaxy, is the Ca contrast at 4000 AA (K/sub 4000/). This quantity, which is defined as the relative depression of the spectrum across 4000 AA, is a typical feature observed in a "normal" elliptical galaxy; the samples ...

  9. Recherches biologiques et pisciculture expérimentale du goujon (Gobio gobio L.

    Directory of Open Access Journals (Sweden)

    BRUNET R.

    1972-07-01

    Full Text Available 1.1. Le goujon Gobio gobio L. (sous-espèce gobio est un poisson de rivières peu rapides, à instinct grégaire, vivant sur fond de gravier entre la région salmonicole et la région cyprinicole. Il peut vivre de 5 à 7 années et se reproduire dès la seconde année. 1.2. Le goujon n'est pas un poisson migrateur comme les expériences réalisées par marquage tendent à le démontrer, mais ce poisson à forte capacité reproductrice peut passer par des périodes de prolifération ou de raréfaction. 1.3. Le goujon est un poisson de type Carnivore qui s'alimente normalement durant toute l'année. Les adultes se nourissent principalement à partir du benthos ; les proies sont, en ordre d'importance décroissante, des larves d'Insectes, des Crustacés, des Mollusques, des Vers et des Algues ou détritus végétaux. Les alevins s'alimentent principalement à partir du plancton ; la nourriture est de même nature qualitativement, mais quantitativement les Crustacés y sont beaucoup plus abondants que les Insectes. 1.4. Le goujon est fréquemment parasité par le Plathelminte Monogène du genre Diplozoon ; ce parasite peut infester 90 % de la population. Il est parfois parasité par un grand Nématode du genre Philometra qui envahit la cavité générale. 1.5. Le goujon pond au printemps et en été, mais le début de la ponte est nettement lié à la température de l'eau (minimum de + 16°C à + 17°C; la ponte est fractionnée, mais peut atteindre 4 000 à 5 000 œufs par femelle et par saison. L'œuf, blanc translucide, mesure 1,5 mm de diamètre; l'incubation est de 125 degrés/jour. L'essai d'élevage en aquarium prouve qu'une alimentation artificielle adaptée doit être possible. 1.6. La pisciculture des alevins est réalisée dans la région toulousaine et permet d'indiquer les normes souhaitables. Pour la ponte, des bassins de 1 000 m2 , avec pente de 1 % et fond de gravier, peuvent recevoir 500 géniteurs. La croissance des alevins d'un

  10. Laccase 1 gene from Plutella xylostella (PxLac1) and its functions in humoral immune response.

    Science.gov (United States)

    Wang, Ze-Hua; Hu, Rong-Min; Ye, Xi-Qian; Huang, Jian-Hua; Chen, Xue-Xin; Shi, Min

    Laccase (EC 1.10.3.2) is a phenoloxidase found in many insect species. The Laccase 1 gene from Plutella xylostella (PxLac1) was cloned, and its expression patterns and functions were determined using qPCR and RNAi methods. The results showed that the expression levels of PxLac1 were consistently high in all larval stages, and the most abundant was in the midgut during the 4th instar stage. Moreover, the expression of PxLac1 was up-regulated in response to bacterial infection, and decreased 24 h after being parasitized by Cotesia vestalis. Further analyses indicated that the effect of parasitization on PxLac1 was induced by active C. vestalis Bracovirus (CvBV). Haemocyte-free hemolymph phenoloxidase (PO) activity was suppressed when PxLac1 was treated with RNAi. Our results provide evidence for a connection between the Laccase 1 gene and insect immunity, and revealed that parasitoid polydnavirus suppresses host PO activity via PxLac1 regulation. Copyright © 2018. Published by Elsevier Ltd.

  11. Archives: les cahiers du cread

    African Journals Online (AJOL)

    Items 1 - 24 of 24 ... Archives: les cahiers du cread. Journal Home > Archives: les cahiers du cread. Log in or Register to get access to full text downloads. Username, Password, Remember me, or Register · Journal Home · ABOUT THIS JOURNAL · Advanced Search · Current Issue · Archives. 1 - 24 of 24 Items. 2016 ...

  12. Le commerce du Nord

    OpenAIRE

    Pourchasse, Pierrick; Bouëdec, Gérard Le

    2015-01-01

    Au XVIIIe siècle, la France s'approvisionne abondamment dans les pays du Nord : bois, chanvre et goudron de la Baltique, tonnellerie de Poméranie, pêche de rogue de Norvège, graines de lin de Courlande, barres de fer suédois… Sa balance commerciale est pourtant positive grâce aux sels, aux vins et surtout des nouvelles marchandises coloniales. Or, la plupart des transactions passent par l’incontournable intermédiaire hollandais. Les explications sur l’absence des Français dans le Nord sont re...

  13. La voie du Centre

    OpenAIRE

    2017-01-01

    Après avoir quelque peu louvoyé dans un discours apparemment anarchique où les souvenirs semblent se bousculer sans autre fil conducteur que la référence obsédante au mal satanique, brusquement le narrateur annonce un événement primordial : Foi um fato que se deu, um dia, se abriu. O primeiro. Depois o senhor verá por quê, me devolvendo minha razão (79). Cette introduction situe la rencontre du Menino comme fondatrice d’un destin dont il reviendrait au narrataire de dégager les enchaînements....

  14. Bulletin du CRDI #126

    International Development Research Centre (IDRC) Digital Library (Canada)

    26 févr. 2018 ... Dans ce numéro, découvrez comment la recherche financée par le CRDI permet d'améliorer la santé des mères et des enfants dans les pays du Sud et comment les innovations techniques et sociales de l'initiative SEARCH permettent de surmonter les défis liés à la cybersanté. N'oubliez pas non plus de ...

  15. Choeur du CERN : Concert

    CERN Multimedia

    CERN Choir

    2017-01-01

    Une œuvre à découvrir! La grande Missa pro defunctis de François-Joseph Gossec (1734-1829) est le chef-d’œuvre tôt venu (à vingt-cinq ans) d’un compositeur qui vivra encore 70 ans après sa création. Elle a connu la gloire, puis s’est fait un peu oublier. Pas du tout le monde cependant : des musicologues ont montré ce que le Requiem de Mozart lui devait ; et il suffit de l’avoir entendue pour comprendre pourquoi Berlioz (qui avait vingt-six ans à la mort de Gossec) en a été impressionné : les nombreux cuivres et bois répartis dans des endroits plus ou moins cachés de la salle de concert pour exprimer les frayeurs du Jugement dernier annoncent son Requiem – et celui de Verdi. Mais « plus encore que par...

  16. Les risques du travail

    CERN Document Server

    Thébaud-Mony, Annie

    2015-01-01

    Depuis les années 1990, les conditions de travail se sont peu à peu imposées dans le débat social. Néanmoins, la situation reste critique. Les risques traditionnels n'ont pas disparu : les manutentions lourdes, l'exposition professionnelle aux cancérogènes, au bruit ou aux vibrations demeurent répandues... De plus, certaines " améliorations " n'ont fait que déplacer et dissimuler les problèmes, telle l'externalisation des risques grâce à la sous-traitance. Dans le même temps, les transformations du travail et des modalités de gestion de la main-d'œuvre ont fragilisé les collectifs et accru l'isolement des salariés, conduisant à une montée visible de la souffrance psychique. Face à ces évolutions, il est plus que jamais nécessaire que tous les acteurs concernés, en particulier les salariés eux-mêmes et leurs représentants, s'approprient les connaissances indispensables pour améliorer la protection de la santé sur les lieux du travail. Tel est le but de ce livre, qui renouvelle int�...

  17. SURVIE EMBRYONNAIRE DU SAUMON ATLANTIQUE (SALMO SALAR L. DANS UN COURS D’EAU DU SUD DE SON AIRE DE RÉPARTITION, LA NIVELLE

    Directory of Open Access Journals (Sweden)

    DUMAS J.

    2007-01-01

    Full Text Available L’évaluation de la survie du saumon Atlantique entre la ponte et l’émergence des alevins hors des graviers est réalisée dans le bassin de la Nivelle dans les domaines accessible (trois tronçons et non accessible (trois tronçons aux géniteurs. Pour ce faire, des capsules d’incubation de 12 cm3, contenant des œufs fraîchement fécondés, sont insérées dans des frayères artificielles et naturelles. Le débit et la température de l’eau de surface, l’oxygène dissous des eaux de surface et interstitielle et les caractéristiques granulométriques du substrat des frayères sont contrôlés pendant toute la durée de l’expérience. La survie, de 28,6 % en moyenne dans l’ensemble des sites, est plus élevée dans les tronçons de l’amont (52,7 % dans la Très Haute Nivelle et son affluent, le Lapitxuri que dans les autres sites, dont ceux actuellement colonisés par l’espèce (21,5 %. Il n’est pas observé de différence de survie entre les frayères artificielles et naturelles. Les mortalités interviennent essentiellement lors des épisodes de crues avant l’éclosion. Une corrélation positive forte existe entre la saturation en oxygène de l’eau interstitielle et la survie. Pour une saturation minimum en oxygène au-dessous de 62 %, la survie reste inférieure à 27 %. En revanche, la composition granulométrique du substrat ne semble pas agir directement sur la survie. Ce facteur n’étant pas corrélé avec l’oxygène dissous, ceci suggère que dans ce cours d’eau, le flux circulant dans les frayères ne provient pas uniquement de l’eau de surface, mais aussi de la nappe alluviale pauvre en oxygène dissous.

  18. Spatial and Temporal Variations in Diatoms from la Chaine des Lacs Urban Watershed, Nord-Pas France, in Relation to Water Quality

    Science.gov (United States)

    Noble, P. J.; Van de Vijver, B.; Verleyen, E.; Prygiel, J.; Ivanovsky, A.; Lesven, L.; Billon, G.

    2016-12-01

    Diatom analysis was conducted on lake sediments in la Chaîne des Lacs (CDL), a shallow eutrophic urban park and storm control system in Villeneuve d'Ascq, France, to address both the present day water quality, and the evolution of this urban system over its 40 year history. The main lake, Lac du Héron (LDH), received recent attention because of water quality problems, including eutrophication, harmful algal blooms, and invasion by the macrophyte Elodea in 2012. A total of 17 sites were collected in CDL, 11 of which were in LDH, to document spatial variability, and a 26cm long core addresses historical changes. The bulk of the diatom assemblage in LDH can be classified as both eutrophic and moderately metal tolerant, using modern national diatom indices developed and used by the French regional water agencies. Surface sediment samples within LDH show large spatial variations in %Cocconeis placentula whose habitat is epiphytic growth on Elodea. Other variation is reflected in the phytoplankton composition both spatially, and interannually. Aulacoseira muzzanensis and Cyclostephanos dubius showed greater abundance in the open water habitats in LDH, whereas sites in CDL outside of LDH had greater Cyclotella meneghiniana. Temporally, Stephanodicsus (largely S. hantzschii), the dominant diatom in early spring, were present in greater abundances in the 2016 surface sediment samples than in any of the 2015 samples. One possible explanation is that the 2016 samples, taken March 30th, preferentially preserved the early spring Stephanodiscus bloom, in contrast to the 2015 samples, which were taken in January. The sediment core provides an historical record, where the uppermost 4cm plot with the bulk of the LDH surface samples and contain abundant Cocconeis, 4 -14cm is phytoplankton-rich, largely Cyclostephanos dubius and Aulacoseira muzzanensis, and represents a less weed-choked environment prior to the 2012 Elodea invasion. The base of the core is dominated by Amphora and

  19. Effector Overlap between the lac and mel Operons of Escherichia coli: Induction of the mel Operon with β-Galactosides.

    Science.gov (United States)

    Narang, Atul; Oehler, Stefan

    2017-05-01

    The lac (lactose) operon (which processes β-galactosides) and the mel (melibiose) operon (which processes α-galactosides) of Escherichia coli have a close historical connection. A number of shared substrates and effectors of the permeases and regulatory proteins have been reported over the years. Until now, β-thiogalactosides like TMG (methyl-β-d-thiogalactopyranoside) and IPTG (isopropyl-β-d-thiogalactopyranoside) have not generally been considered to be inducers of the mel operon. The same is true for β-galactosides such as lactose [β-d-galactopyranosyl-(1→4)-d-glucose], which is a substrate but is not itself an inducer of the lac operon. This report shows that all three sugars can induce the mel operon significantly when they are accumulated in the cell by Lac permease. Strong induction by β-thiogalactosides is observed in the presence of Lac permease, and strong induction by lactose (more than 200-fold) is observed in the absence of β-galactosidase. This finding calls for reevaluation of TMG uptake experiments as assays for Lac permease that were performed with mel + strains. IMPORTANCE The typical textbook picture of bacterial operons is that of stand-alone units of genetic information that perform, in a regulated manner, well-defined cellular functions. Less attention is given to the extensive interactions that can be found between operons. Well-described examples of such interactions are the effector molecules shared by the lac and mel operons. Here, we show that this set has to be extended to include β-galactosides, which have been, until now, considered not to effect the expression of the mel operon. That they can be inducers of the mel operon as well as the lac operon has not been noted in decades of research because of the Escherichia coli genetic background used in previous studies. Copyright © 2017 American Society for Microbiology.

  20. Eocene to Miocene back-arc basin basalts and associated island arc tholeiites from northern Sulawesi (Indonesia): Implications for the geodynamic evolution of the Celebes basin; Basaltes de bassin arriere-arc de l`Eocene-Miocene et tholeiites d`arc insulaire associees du nord Sulawesi (Indonesie): implications pour l`evolution geodynamique du bassin des Celebes

    Energy Technology Data Exchange (ETDEWEB)

    Rangin, C. [Centre National de la Recherche Scientifique (CNRS), 75 - Paris (France); Maury, R.C.; Bellon, H.; Cotten, J. [Universite de Bretagne Occidentale, 29 - Brest (France); Polve, M. [Universite Paul Sabatier, 31 - Toulouse (France); Priadi, B.; Soeria-Atmadja, R. [Department of Geology, ITB, Bandung (Indonesia); Joron, J.L. [CEA Centre d`Etudes de Saclay, 91 - Gif-sur-Yvette (France). Dept. de Recherche sur l`Etat Condense, les Atomes et les Molecules

    1997-12-31

    Eocene BABB basalts intruded by tholeiitic and calk-alkalic island arc magmatic rocks are reported from the north arm of Sulawesi (Indonesia). Age and geochemical similarities between these basalts and those drilled in the Celebes Sea indicate this North Sulawesi volcanic arc was built on the same oceanic crust. The 25 deg late Neogene clockwise rotation of the north arm of Sulawesi following its collision with fragments of Australia (Sula, Buton) is not sufficient to explain the asymmetrical magnetic anomalies in the Celebes basin. The North Sulawesi island arc could be interpreted as having progressively retreated northward on its own Celebes sea back arc basin, during an episode of Palaeogene-early Neogene tectonic erosion along the trench. (authors) 37 refs.

  1. Jouer du piano

    Directory of Open Access Journals (Sweden)

    Fériel Kaddour

    2011-04-01

    Full Text Available La réflexion s’appuie dans un premier temps sur une opposition entre deux attitudes de pianistes  à l’égard du travail à l’instrument : Gould, qui revendique une séparation d’avec le clavier pour ne privilégier que la lecture; Arrau, dont la technique au contraire vise à « faire corps » avec son piano. L’étude de ces deux démarches d’interprètes conduit à une conclusion croisée : l’abstraction gouldienne n’est rien d’autre qu’un déplacement du jeu vers d’autres instruments (ceux qui servent à la prise de son et au montage de ses enregistrements ; le « faire-corps » hérité de la culture pianistique romantique est plus dialectique que fusionnel, et en cela implique une capacité de mise à distance. A partir de cette double conclusion, on tâche enfin de repenser la place du jeu à l’instrument dans la mise en œuvre d’une interprétation, en interrogeant le dialogue qui s’instaure entre la partition telle qu’elle s’écrit et le geste tel qu’il se joue.Our study leans on an opposition between two pianists' attitudes about their work with the instrument. Gould claims a necessary separation from the keyboard in order to prioritize reading. Arrau, on the contrary, relies on a technique which consists in “being one” with his piano. The analysis of these two interprets’ behaviours leads to a crossed conclusion: the gouldian abstraction is nothing else than a displacement of the playing towards another kind of instruments, the ones he uses in sound recording and cut up; Arrau’s “being one” is more dialectic than at first sight, and it therefore implies a real distancing from the piano. This constatation leads to rethink the place of the piano playing in the setting of an interpretation, and to highlight the real dialogue which develops itself between the score as it has been written and the gesture as it is played.

  2. Parameters controlling fracturing distribution: example of an Upper Jurassic marly-calcareous formation (eastern Paris Basin); Parametres controlant la distribution de la fracturation: exemple dans une serie marno-calcaire du Jurassique superieur (Est du bassin de Paris)

    Energy Technology Data Exchange (ETDEWEB)

    Andre, G.; Rebours, H.; Wileveau, Y. [Agence Nationale pour la Gestion des Dechets Radioactifs (ANDRA), Laboratoire de recherche souterrain de Meuse/Haute-Marne, 55 - Bure (France); Proudhon, B. [GEO.TER, 34 - Clapiers (France)

    2006-10-15

    Study of fractures along a 490-m vertical section of marl/limestone alternations in the Upper Jurassic (Meuse/Haute-Marne underground research laboratory-eastern Paris Basin) reveals their organization and the different states of palaeo-stress. Type and extension of tectonic structures seem to be controlled principally by lithology and secondary by depth. Also, it appears deviations of Alpine palaeo-stresses between Kimmeridgian and Oxfordian formations. These deviations are related to the presence of marl/limestone contacts. The vertical evolution of current horizontal maximum stress shows a similar behaviour, with deviations at the walls of Callovo-Oxfordian argilites. These results allow us to point out and to discuss the impact of lithology, rheology and depth on fracturing occurrence and distribution. Furthermore, this study suggests the role of Callovo-Oxfordian as a barrier for fracture development between the limestones of Dogger and Oxfordian formations. (authors)

  3. Étude magnétostratigraphique préliminaire sur l'âge du bassin de Rudgai-Sibi (Nord-Est du Balouchistan, Pakistan) et ses implications tectoniques

    Science.gov (United States)

    Durrani, Khadim H.; Chen, Yan; Courme, Marie-Denise; Kassi, Akhtar

    1997-07-01

    A first magnetostratigraphic study was carried out in Neogene fluvial formations of the Rudgai (Sibi) basin in the Sulaiman Fold Belt. In order to date these units more precisely and to understand the tectonic implications for the formation of this basin, a total of 59 samples were analysed in the laboratory. The results show that a unique correlation is possible between the observed magnetic polarity stratigraphy and the magnetic polarity stratigraphy scale. This allows us to place the sequence between 16.5 and 14.8 Ma and to show that the molassic sediments are well diachronic between the Rudgai (Sibi) basin (16.5 Ma) the basins of the Potwar Plateau (10.1 Ma).

  4. 2D compositional modeling of petroleum generation, expulsion and migration in the Southern compartment of the Reconcavo Basin, Brazil; Modelisation compositionnelle 2D de la genese, expulsion et migration du petrole dans le compartiment sud du Bassin de Reconcavo, Bresil

    Energy Technology Data Exchange (ETDEWEB)

    Barroz Penteado, H.L. de

    1999-01-07

    The Reconcavo Basin is part of a rift formed between the Late Jurassic and the Early Cretaceous in northeastern Brazil. The objective of this thesis was the compositional modeling of petroleum generation, expulsion and migration along a cross-section in the Southern Compartment of the basin with the Temispack basin simulation software. A geochemical study of the lacustrine shales of the Gomo Member (Candelas Fm.) has been performed to determine their petroleum potential, the evolution of maturation with depth and changes in petroleum composition. Hydrogen indices of immature kerogens (400-850 mg/g TOC) were shown to be higher than those of whole rocks, thus indicating a retention of Rock-Eval pyrolysis products in the mineral matrix of these type I source rocks. Saturates (30-50% of organic extracts in the immature zone) increase both in absolute and in relative (60-80%) terms in the oil window (2000-2600 m) because of a partial secondary cracking of NSOs and aromatics. After having tested several scenarios of geodynamic evolution between the Aptian and the Oligocene, a variable thickness of post-rift sediments (maximum of 1200 m) has been shown to be necessary to calibrate maturity parameters. Petroleum migration has been modeled to understand migration pathways as well as the role of faults as drains. Thus, two petroleum migration systems have been identified for the Dom Joao and Cexis accumulations. Petroleum compositional variations have been modeled by coupling the processes of retention and secondary cracking. A good calibration of compositions was obtained with secondary cracking parameters for NSOs and aromatics which are close to those of the main primary cracking reaction of a type I kerogen, coupled with a retention of 50% of NSOs within the source rocks. (author)

  5. Contribution to the geology of the Niari basin: sedimentology and metallogeny of the mining region; Contribution a la geologie du Bassin du Niari sedimentologie et metallogenie de la region miniere

    Energy Technology Data Exchange (ETDEWEB)

    Bigotte, G. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1956-01-15

    This thesis is divided in two parts: a detailed petrographical and stratigraphical study of the upper layers of calcareous schist in Congo which lead to some sedimentological considerations, and a metallogenic study of the ores of Niari basin which lead to a theoretical description of the metallogeny in Congo. In the first part, after a brief description of the methods used, a petrographical survey of the rocks of the upper layers of calcareous schist of the Boko-Congo area is given as well as sedimentological conclusions and stratigraphical data. The studies and conclusions related to this limited area are extended to a region scale. A structural study and precised descriptions of this region lead to an attempt of tectonic explanation. In the second part, an inventory and description of known mineralisation points in the Niari basin are given and in particular the detailed descriptions of four deposits: La Grande-Mine, M'Passa, Diangala and Djenguile. The interpretations and conclusions are based on the study of the general characters of the mineralisation in Niari basin and its comparison with the mineralisation in Katanga (now Shaba region) and North Rhodesia (now Zambia). (M.P.)

  6. Contribution of the gravimetry to the structural study of the Haouz basin (Morocco); Apport de la gravimetrie a l'etude de la structure du bassin du Haouz (Maroc)

    Energy Technology Data Exchange (ETDEWEB)

    El Goumi, N.; Jaffal, M.; Kchikach, A.; Manar, A.

    2010-07-01

    The aim of the present study is to improve the knowledge of the Haouz basin structure using gravity data analysis. First of all, a residual anomaly map was computed from the Bouguer anomaly, greatly affected by an important regional gravity gradient. The calculated map provides information on the ground density variations mainly attributed to the top of the Paleozoic basement undulations under the sedimentary cover. However, in order to further study this map, it has been later analyzed with a method that allows evidencing different buried geological structures, combining the horizontal gradient and the upward continuations processing. The obtained results allow us to establish a structural map of the Haouz basin which confirms the existence of structures already recognized or assumed by the classic geological studies, and highlights accidents, as yet, unknown until the present time. This map shows that the fault system of the Haouz basin is organized in two families of directions NE-SW and NW-SE. (Author).

  7. Contribution to the geology of the Niari basin: sedimentology and metallogeny of the mining region; Contribution a la geologie du Bassin du Niari sedimentologie et metallogenie de la region miniere

    Energy Technology Data Exchange (ETDEWEB)

    Bigotte, G [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1956-01-15

    This thesis is divided in two parts: a detailed petrographical and stratigraphical study of the upper layers of calcareous schist in Congo which lead to some sedimentological considerations, and a metallogenic study of the ores of Niari basin which lead to a theoretical description of the metallogeny in Congo. In the first part, after a brief description of the methods used, a petrographical survey of the rocks of the upper layers of calcareous schist of the Boko-Congo area is given as well as sedimentological conclusions and stratigraphical data. The studies and conclusions related to this limited area are extended to a region scale. A structural study and precised descriptions of this region lead to an attempt of tectonic explanation. In the second part, an inventory and description of known mineralisation points in the Niari basin are given and in particular the detailed descriptions of four deposits: La Grande-Mine, M'Passa, Diangala and Djenguile. The interpretations and conclusions are based on the study of the general characters of the mineralisation in Niari basin and its comparison with the mineralisation in Katanga (now Shaba region) and North Rhodesia (now Zambia). (M.P.)

  8. Analysis of the accelerometric data applied to seismic hazard assessment in France; Anisotropies magnetique et de porosite des argilites du callovo-oxfordien du laboratoire souterrain de l'Andra (Meuse/Haute-Marne, Bassin de Paris)

    Energy Technology Data Exchange (ETDEWEB)

    Esteban, L

    2006-09-15

    In order to test the feasibility of nuclear waste storage, ANDRA, the French Agency in charge of radioactive waste management, gave us the opportunity to study preserved specimens of Jurassic clay-rich rocks from eastern Paris Basin. These rocks, deposited during the Callovian and beginning of the Oxfordian, are dark- to light-grey marls that consist mainly in a mixture of clay, calcite and silt. Core-specimens regularly collected along the Callovo-Oxfordian formation from several vertical and oblique boreholes, were subjected to a magnetic mineralogy study, and to a petro-fabric study with respect to the geographical frame, itself related to a study of the pore network. The mineralogy study helps to characterize the nature of the para- and -ferrimagnetic fractions at the origin of the magnetic susceptibility and remanence which vary according to the clay/calcite/silt ratios, the latter being mostly made of detrital grains of magnetite. In the clay-rich rocks (illite and smectites), the ferrimagnetic fraction is also made of authigenic sulfides, possibly greigite, which accompany the ubiquitous framboids of pyrite. This fraction seems to equate with the soft coercive fraction which was used to re-orient the vertical borehole cores with respect to the present magnetic north. The hard fraction equates with the iron-oxides, in agreement with the random nature of the natural remanence. Hence, the coexistence in the same sediment of iron-sulfides and iron-oxides is related to distinct origins rather than to variable conditions during sedimentation or diagenesis. Preservation of these species is attributed to the very low permeability that the sediment reached after its compaction. The anisotropy of magnetic susceptibility (AMS) reflects the zone-axis organization of the clay minerals, and eventually the shape fabric of the ferromagnetic fraction. Expectingly, the short axis of the AMS (K3) is vertical (perpendicular to bedding) with an anisotropy degree on the order of 0,3-5%, and the long axis (K1) is constantly trending around N-S in the clay-rich levels and around NW-SE in the silt-enriched levels. This linear fabric is argued to derive either from an anisotropic compaction toward the depocenter, or to parallel the direction of the currents coming from the NE (Bohemian and Rhenan massifs) or from the NW (London-Brabant massif) during sedimentation. This mineral fabric is compared to the anisotropy of the pore network connectivity in representative lithologies of the formation. We performed high pressure mercury injections parallel to the AMS axes, in order to reflect the anisotropy of connectivity, and AMS measurements after impregnation with a ferro fluid at different pressures, in order to obtain the shapes of the pore network. From these data, we tentatively propose three pore models, the first one for the silt-enriched specimens where vertically pathways seem to control the connectivity, the second one for the carbonate-enriched specimens where the highest connectivity is parallel to bedding, and which is almost isotropic in the bedding plane in spite of an anisotropic pore structure, and the third one for the clay-enriched specimens (at the site of the ANDRA Laboratory), where the highest connectivity, also parallel to bedding, parallels the magnetic lineation. In conclusion, in addition to this petrophysical modelling of the pore network, in relation with the rock texture at the micro-scale, our mineralogical approach helped to confirm (and locally refine) the sequential stratigraphy of this part of the Jurassic, corresponding to a colder event in-between two carbonaceous-platforms. Our mineralogical approach added to fabric considerations helped us to propose an original dynamical scenario of the sedimentary supplies. (author)

  9. The Callovo-Oxfordian of the Paris Basin: From its geological context to the modelling of its properties; Le Callovo-Oxfordien du bassin de Paris: du contexte geologique a la modelisation de ses proprietes

    Energy Technology Data Exchange (ETDEWEB)

    Anon

    2006-10-15

    The French law from December 30, 1991 entrusted the French national agency for radioactive wastes (ANDRA) with the mission of assessing the feasibility of a deep geological repository in the clay-rich Callovo-Oxfordian formation of NE France (Meuse and Haute-Marne departements). A research program, coordinated by ANDRA and involving several university laboratories and other French organizations (CNRS, CEA, BRGM, INERIS, INPL, ENSMP) has permitted to gather a huge amount of information about the properties of the Callovo-Oxfordian formation of the eastern part of the Paris basin. These properties are summarized in this introductive paper: paleo-geography, bio-stratigraphy of ammonites, clay mineralogy and other minerals content, anisotropy of argillite beds, permeability and porosity, osmosis and thermal diffusion, chemistry of interstitial waters, fracturing.. (J.S.)

  10. Morphologie, évolution latérale et signification géodynamique des discontinuités sédimentaires. Exemple de la marge Ouest du Bassin du Sud-Est (France)

    OpenAIRE

    HAMON , Youri

    2004-01-01

    M. Hervé PHILIP PrésidentM. Gilles MERZERAUD Directeur de ThèseM. Michel SERANNE Co-Directeur de ThèseM. François GUILLOCHEAU RapporteurM. Bernard PEYBERNES RapporteurM. Marc FLOQUET ExaminateurM. Christophe RIGOLLET Examinateur; In the Lodève region (« Caussenard High », southwestern margin of the South-East Basin), liasic deposits are composed of peritidal dolomitic facies of Hettangian age, overlained by Sinemurian shallow water carbonate ramp deposits, capped by a major hardground. A majo...

  11. The SOS-LUX-LAC-FLUORO-Toxicity-test on the International Space Station (ISS).

    Science.gov (United States)

    Rabbow, E; Rettberg, P; Baumstark-Khan, C; Horneck, G

    2003-01-01

    In the 21st century, an increasing number of astronauts will visit the International Space Station (ISS) for prolonged times. Therefore it is of utmost importance to provide necessary basic knowledge concerning risks to their health and their ability to work on the station and during extravehicular activities (EVA) in free space. It is the aim of one experiment of the German project TRIPLE-LUX (to be flown on the ISS) to provide an estimation of health risk resulting from exposure of the astronauts to the radiation in space inside the station as well as during extravehicular activities on one hand, and of exposure of astronauts to unavoidable or as yet unknown ISS-environmental genotoxic substances on the other. The project will (i) provide increased knowledge of the biological action of space radiation and enzymatic repair of DNA damage, (ii) uncover cellular mechanisms of synergistic interaction of microgravity and space radiation and (iii) examine the space craft milieu with highly specific biosensors. For these investigations, the bacterial biosensor SOS-LUX-LAC-FLUORO-Toxicity-test will be used, combining the SOS-LUX-Test invented at DLR Germany (Patent) with the commercially available LAC-FLUORO-Test. The SOS-LUX-Test comprises genetically modified bacteria transformed with the pBR322-derived plasmid pPLS-1. This plasmid carries the promoterless lux operon of Photobacterium leiognathi as a reporter element under control of the DNA-damage dependent SOS promoter of ColD as sensor element. This system reacts to radiation and other agents that induce DNA damages with a dose dependent measurable emission of bioluminescence of the transformed bacteria. The analogous LAC-FLUORO-Test has been developed for the detection of cellular responses to cytotoxins. It is based on the constitutive expression of green fluorescent protein (GFP) mediated by the bacterial protein expression vector pGFPuv (Clontech, Palo Alto, USA). In response to cytotoxic agents, this system

  12. The effect of stochasticity on the lac operon: an evolutionary perspective.

    Directory of Open Access Journals (Sweden)

    Milan van Hoek

    2007-06-01

    Full Text Available The role of stochasticity on gene expression is widely discussed. Both potential advantages and disadvantages have been revealed. In some systems, noise in gene expression has been quantified, in among others the lac operon of Escherichia coli. Whether stochastic gene expression in this system is detrimental or beneficial for the cells is, however, still unclear. We are interested in the effects of stochasticity from an evolutionary point of view. We study this question in the lac operon, taking a computational approach: using a detailed, quantitative, spatial model, we evolve through a mutation-selection process the shape of the promoter function and therewith the effective amount of stochasticity. We find that noise values for lactose, the natural inducer, are much lower than for artificial, nonmetabolizable inducers, because these artificial inducers experience a stronger positive feedback. In the evolved promoter functions, noise due to stochasticity in gene expression, when induced by lactose, only plays a very minor role in short-term physiological adaptation, because other sources of population heterogeneity dominate. Finally, promoter functions evolved in the stochastic model evolve to higher repressed transcription rates than those evolved in a deterministic version of the model. This causes these promoter functions to experience less stochasticity in gene expression. We show that a high repression rate and hence high stochasticity increases the delay in lactose uptake in a variable environment. We conclude that the lac operon evolved such that the impact of stochastic gene expression is minor in its natural environment, but happens to respond with much stronger stochasticity when confronted with artificial inducers. In this particular system, we have shown that stochasticity is detrimental. Moreover, we demonstrate that in silico evolution in a quantitative model, by mutating the parameters of interest, is a promising way to unravel

  13. Constraining the red shifts of TeV BL Lac objects

    Science.gov (United States)

    Qin, Longhua; Wang, Jiancheng; Yan, Dahai; Yang, Chuyuan; Yuan, Zunli; Zhou, Ming

    2018-01-01

    We present a model-dependent method to estimate the red shifts of three TeV BL Lac objects (BL Lacs) through fitting their (quasi-)simultaneous multi-waveband spectral energy distributions (SEDs) with a one-zone leptonic synchrotron self-Compton model. Considering the impact of electron energy distributions (EEDs) on the results, we use three types of EEDs to fit the SEDs: a power-law EED with exponential cut-off (PLC), a log-parabola (PLLP) EED and the broken power-law (BPL) EED. We also use a parameter α to describe the uncertainties of the extragalactic background light models, as in Abdo et al. We then use a Markov chain Monte Carlo method to explore the multi-dimensional parameter space and obtain the uncertainties of the model parameters based on the observational data. We apply our method to obtain the red shifts of three TeV BL Lac objects in the marginalized 68 per cent confidence, and find that the PLC EED does not fit the SEDs. For 3C66A, the red shift is 0.14-0.31 and 0.16-0.32 in the BPL and PLLP EEDs. For PKS1424+240, the red shift is 0.55-0.68 and 0.55-0.67 in the BPL and PLLP EEDs. For PG1553+113, the red shift is 0.22-0.48 and 0.22-0.39 in the BPL and PLLP EEDs. We also estimate the red shift of PKS1424+240 in the high stage to be 0.46-0.67 in the PLLP EED, roughly consistent with that in the low stage.

  14. La grammaticalisation du monde.

    Directory of Open Access Journals (Sweden)

    Etienne Pingaud

    2010-01-01

    Full Text Available Ouvrage atypique par le fond comme par la forme, Le devoir et la grâce rend compte du minutieux travail d’élaboration théorique auquel s’attelle Cyril Lemieux depuis plusieurs années. Et le résultat final se veut pour le moins ambitieux : l’auteur propose un système total supposé dépasser d’un même élan le relativisme, le mentalisme, l’universalisme ethnocentrique, l’historicisme, le naturalisme et l’herméneutisme, tout en réconciliant les sciences sociales avec le ...

  15. Le sacre du printemps

    Directory of Open Access Journals (Sweden)

    Denise Pumain

    2002-03-01

    Full Text Available Cybergeo aura six ans en avril : dans la réalité du virtuel, dans l'univers récent et fluctuant de la publication en ligne, cela fait de nous, tout à la fois, des pionniers et des vétérans. De façon plus surprenante, il se trouve que nous sommes aussi uniques : parmi toutes les revues électroniques de sciences sociales, aucune ne combine comme Cybergeo ancienneté, publication exclusivement électronique, liberté d'accès au texte intégral, édition et gestion par des chercheurs, et comité de lec...

  16. Le Brahmane du Komintern

    Directory of Open Access Journals (Sweden)

    Elizabeth Burgos

    2008-01-01

    Full Text Available Le Brahmane du Komintern, largometraje documental del realizador francés Vladimir León, constituye un ejercicio ejemplar de investigación histórica y  de lograda factura de realización. Y, pese a no haber contado con la ayuda de ninguno organismo público, se trata de un ambicioso proyecto que cubre una amplia extensión geográfica que abarca: Estados Unidos, México, Moscú, Berlín, y la India. Gira en torno a una figura que tuvo en su tiempo su hora de gloria. Un bengalí, hijo de braman, la c...

  17. (Sorghum bicolor (L.) Moench) du Nord du Burkina Faso

    African Journals Online (AJOL)

    SARAH

    29 déc. 2014 ... sorghos à grains sucrés ont un cycle court et arrivent donc à maturité avant les autres sorghos et le mil d'où leur exploitation comme aliment de soudure par les paysans. L'organisation de la diversité morphologique des accessions de sorghos à grains sucrés du Nord du. Burkina autour principalement des ...

  18. Simulation technico-économique d’une filière locale de valorisation du soja en alimentation animale dans le Sud-Ouest de la France

    Directory of Open Access Journals (Sweden)

    Quinsac Alain

    2015-09-01

    Full Text Available Dans le contexte du développement de la culture du soja dans le Sud-Ouest de la France et à partir d’un diagnostic des filières de production de graines et des débouchés possibles, la mise en place d’une unité de trituration est envisagée dans cette région selon trois scénarios de taille d’usine et de localisation (3000 tonnes par an (t/an dans le bassin Tarn-Aveyron, 15 000 t/an dans le Gers et 30 000 t/an dans la vallée de la Garonne. Le procédé retenu (aplatissage-cuisson-pression permet la production de tourteau de valeur alimentaire proche du tourteau de soja déshuilé importé. Un modèle de calcul de la marge nette de trituration a simulé le fonctionnement et les résultats économiques de ces usines de 2007 à 2014. Pour les scénarios 3000, 15 000 et 30 000 t/an, les résultats obtenus montrent que l’augmentation de la taille de l’usine réduit très fortement le coût de trituration (respectivement 119,6 €/t, 44,9 €/t et 33,6 €/t et que les coûts de transport sont logiquement impactés par la densité des bassins de production et de consommation. Le surplus économique créé s’élève respectivement à –72, 10 et –2 €/t en moyenne pour la période 2007–2014 et s’améliore notablement pour les cinq derniers trimestres (–25, 57 et 45 €/t. Le fonctionnement de la filière a été simulé selon les points de vue des différents acteurs économiques (céréalier, organisme stockeur, éleveur pour évaluer le bénéfice retiré. Des perspectives sont indiquées pour la réduction des coûts et pour l’amélioration de la valeur des produits créée.

  19. OPERATION DU FOISONNEMENT

    Directory of Open Access Journals (Sweden)

    Gholamreza Djelveh

    2010-04-01

    Full Text Available Mousses alimentaires sont un sous-ensemble des aliments connus sous le nom de produits fouettés ou des produits aérés. Ils sont des produits formulés avec des qualités telles que la légèreté et la souplesse et sont principalement consommés à l'apéritif ou au dessert. Les produits en mousse obtenue par dispersion d'un gaz dans une matrice alimentaire (la phase continue ont connu un développement croissant au cours des années 80 et 90. Le processus d'aération liés à leurs activités de production est appelée l'expansion ou à fouetter. Le document présente les principaux-paramètres du procédé du point permanent de la formulation, la mise en œuvre processus dans les installations pilotes et à l'échelle industrielle, la caractérisation des produits finis, la base énergétique de l'échelle de processus en place, et le lien entre la formulation, émulsion préparation de l'expansion. Cette vue d'ensemble de l'opération d'expansion continue, nous a permis de mettre en évidence le fait qu'il ya des opérations de l'unité encore mal décrite par le génie des procédés et pour lesquels les méthodes et outils pour l'extrapolation et la prédiction sont encore à leurs balbutiements.

  20. The diluvial rains of Saguenay-Lac-Saint-Jean : status one year after

    International Nuclear Information System (INIS)

    Henri, N.; Beauchemin, G.; Alonso, M.; Gelinas, M.

    1997-01-01

    The status of damages and reconstruction in the Saguenay-Lac-Saint-Jean region, one year after the catastrophic torrential rain storm of July 1996 was presented. Numerous detailed maps and photographs of the principal washed-out, destroyed and damaged regions were presented, along with maps and photographs of the same areas after reconstruction, repair and landscaping. The maps show the different river beds, urban, and rural districts that were subjected to the catastrophic washouts, landslides and soil collapses. The report also includes a summary of the repair costs by municipal regions and the financial aid received by the region to help in the reconstruction effort. tabs., figs

  1. Role of radiation therapy in bladder cancer in the Saguenay-Lac Saint-Jean area

    International Nuclear Information System (INIS)

    Brochet, F.; Barrette, L.R.

    1998-01-01

    Bladder cancer is more frequent in Quebec, especially in Saguenay-Lac Saint-Jean than in other Canadian provinces and in the USA. From 1983 to 1996, only 78 patients presenting with bladder cancer received external beam radiation therapy. Sixty-eight were treated with curative intent Overall survival rates were 70% at 3 years, 66% at 5 years, and 40% at 10 years. Retrospective analysis of these cases and literature review show that preoperative radiation therapy is useful in the management of bladder cancer, especially in T3 tumors. It is also useful for patients whose tumor objectively responds to radiation therapy, without an increase in morbidity. (authors)

  2. Evaluation of critical indicators in the process of acquiring supplies and services LAC-UFPE

    Science.gov (United States)

    Caetano, V. F.; Ferreira, C. V.; dos Santos, M. J.; Honorato, F. A.

    2015-01-01

    In laboratories linked to public universities and accredited by the NBR ISO/IEC 17025, to meet efficiently item 4.6 (procurement of supplies and services) is a challenge that can be accomplished by programming based on historical purchases and services. In this study, we evaluated the critical procurement items to meet the quality management system of the LAC-UFPE: reagents, certified reference material, of equipment parts, maintenance and calibration of equipment and instruments. It was found that the most critical item is the certified reference material, the purchase or repair of which must be expedited within 125 days prior to the receipt to occur within the desired period.

  3. Hopf Bifurcation and Delay-Induced Turing Instability in a Diffusive lac Operon Model

    Science.gov (United States)

    Cao, Xin; Song, Yongli; Zhang, Tonghua

    In this paper, we investigate the dynamics of a lac operon model with delayed feedback and diffusion effect. If the system is without delay or the delay is small, the positive equilibrium is stable so that there are no spatial patterns formed; while the time delay is large enough the equilibrium becomes unstable so that rich spatiotemporal dynamics may occur. We have found that time delay can not only incur temporal oscillations but also induce imbalance in space. With different initial values, the system may have different spatial patterns, for instance, spirals with one head, four heads, nine heads, and even microspirals.

  4. Geology and age of the Lac a la Perdrix fenite, southern Gatineau district, Quebec

    Energy Technology Data Exchange (ETDEWEB)

    Hogarth, D D [Ottawa Univ., ON (Canada). Dept. of Geology; VanBreemen, O [Geological Survey of Canada, Ottawa, ON (Canada)

    1997-12-31

    The Lac a Ia Perdrix fenite lies in the Central Metasedimentary Belt of the Grenville Province. This 30 m wide fenite, adjacent to a narrow calciocarbonatite sill, replaces diopside-oligoclase gneiss and is composed of magnesio-arfvedsonite, aegirine, microcline, albite, and fluorapatite. Near the contact with carbonatite, it contains appreciable monazite and barite whereas aegirine virtually disappears. Fenitization probably took place early in the igneous stage of carbonatite development. A Pb/U monazite age of 1026 {+-} 2 Ma is thought to date fenite formation. Together with published data, this age shows that carbonatite intruded metamorphic rocks near the close of the Grenville Orogeny. (author). 33 refs., 4 tabs., 5 figs.

  5. Analysis of spontaneous deletions and gene amplification in the lac region of Escherichia coli

    International Nuclear Information System (INIS)

    Albertini, A.M.; Hofer, M.; Calos, M.P.; Tlsty, T.D.; Miller, J.H.

    1983-01-01

    Spontaneous rearrangements, such as large deletions and duplications, have important implications for the structure of the genome. It is therefore of great interest to analyze these events at the molecular level. We have constructed derivatives of a lacI-Z fusion strain, which allow us to study deletions in a more systematic manner than was previously possible. These derivatives have been used to investigate how frequently larger deletions (> 700 bp) occur between short homologies on both recA and recA - strains and to determine the effect of the lengths of the short homologies and of the distance between homologies on the frequency of deletion formation. 38 references, 11 figures

  6. VLBA Observations of Low Luminosity Flat Spectrum Radio Galaxies and BL Lac Objects: Polarisation Properties

    Science.gov (United States)

    Bondi, M.; Dallacasa, D.; Stanghellini, C.; Marchã, M. J. M.

    We obtained two-epoch VLBA observations at 5 GHz of a list of radio galaxies drawn from the 200 mJy sample (Marcha et al. 1996). The objects selected for milli-arcsecond scale observations are classified, on the basis of their optical spectroscopic and polarimetric properties, as BL Lac objects, normal weak line radio galaxies, broad line radio galaxies, and transition objects (those with intermediate properties). We present preliminary results on the radio polarization properties, on the milli-arcsecond scale, of objects with different optical properties and discuss structural variations detected from the two epochs.

  7. Fish communities in man-made lakes = Peuplements ichtyologiques des lacs de barrage

    OpenAIRE

    Jackson, P.N.B.; Marshall, B.E.; Paugy, Didier

    1988-01-01

    Il existe actuellement des réservoirs artificiels sur de nombreuses rivières africaines. Leur construction a modifié les conditions écologiques (facteurs édaphiques, apports en éléments nutritifs) et changé la composition des peuplements ichtyologiques ... Le barrage lui-même peut être un obstacle pour des poissons tels que les anguilles ou les mulets migrants depuis la mer et entraîner la disparition des espèces en amont ... Les lacs de barrage ont une vaste zone pélagique favorable au déve...

  8. Alimentation du nouveau-ne et du nourrisson dans la region ...

    African Journals Online (AJOL)

    Alimentation du nouveau-ne et du nourrisson dans la region centrale du togo : pratiques familiales et communautaires avant la mise en oeuvre de la strategie « prise en charge integree des maladies de l'enfant »

  9. High-level expression of Bacillus naganoensis pullulanase from recombinant Escherichia coli with auto-induction: effect of lac operator.

    Directory of Open Access Journals (Sweden)

    Yao Nie

    Full Text Available Pullulanase plays an important role in specific hydrolysis of branch points in amylopectin and is generally employed as an important enzyme in starch-processing industry. So far, however, the production level of pullulanase is still somewhat low from wide-type strains and even heterologous expression systems. Here the gene encoding Bacillus naganoensis pullulanase was amplified and cloned. For expression of the protein, two recombinant systems, Escherichia coli BL21(DE3/pET-20b(+-pul and E. coli BL21(DE3/pET-22b(+-pul, were constructed, both bearing T7 promoter and signal peptide sequence, but different in the existance of lac operator and lacI gene encoding lac repressor. Recombinant pullulanase was initially expressed with the activity of up to 14 U/mL by E. coli BL21(DE3/pET-20b(+-pul with IPTG induction in LB medium, but its expression level reduced continually with the extension of cryopreservation time and basal expression was observed. However, E. coli BL21(DE3/pET-22b(+-pul , involving lac operator downstream of T7 promoter to regulate foreign gene transcription, exhibited pullulanase activity consistently without detected basal expression. By investigating the effect of lac operator, basal expression of foreign protein was found to cause expression instability and negative effect on production of target protein. Thus double-repression strategy was proposed that lac operators in both chromosome and plasmid were bound with lac repressor to repress T7 RNA polymerase synthesis and target protein expression before induction. Consequently, the total activity of pullulanase was remarkably increased to 580 U/mL with auto-induction by lac operator-involved E. coli BL21(DE3/pET-22b(+-pul. When adding 0.6% glycine in culture, the extracellular production of pullulanase was significantly improved with the extracellular activity of 502 U/mL, which is a relatively higher level achieved to date for extracellular production of pullulanase. The

  10. Gtl2lacZ, an insertional mutation on mouse chromosome 12 with parental origin-dependent phenotype.

    Science.gov (United States)

    Schuster-Gossler, K; Simon-Chazottes, D; Guenet, J L; Zachgo, J; Gossler, A

    1996-01-01

    We have produced a transgenic mouse line, Gtl2lacZ (Gene trap locus 2), that carries an insertional mutation with a dominant modified pattern of inheritance:heterozygous Gtl2lacZ mice that inherited the transgene from the father show a proportionate dwarfism phenotype, whereas the penetrance and expressivity of the phenotype is strongly reduced in Gtl2lacZ mice that inherited the transgene from the mother. On a mixed genetic background this pattern of inheritance was reversible upon transmission of the transgene through the germ line of the opposite sex. On a predominantly 129/Sv genetic background, however, transgene passage through the female germ line modified the transgene effect, such that the penetrance of the mutation was drastically reduced and the phenotype was no longer obvious after subsequent male germ line transmission. Expression of the transgene, however, was neither affected by genetic background nor by parental legacy. Gtl2lacZ maps to mouse Chromosome 12 in a region that displays imprinting effects associated with maternal and paternal disomy. Our results suggest that the transgene insertion in Gtl2lacZ mice affects an endogenous gene(s) required for fetal and postnatal growth and that this gene(s) is predominantly paternally expressed.

  11. Évaluation spatiale et prospectives sur le risque de pollution diffuse par le nitrate sur le bassin versant de la Bultière

    Directory of Open Access Journals (Sweden)

    LE FLAHEC, François

    2015-06-01

    Full Text Available En France, la protection des captages d'eau potable est une préoccupation majeure : le Grenelle Environnement a identifié plus de cinq cents sites menacés par les pollutions diffuses, d'où la nécessité de mettre en place des plans d'action pour les protéger. En Vendée, dans le bassin versant de la Bultière, confronté à des rejets importants de nitrate, une étude par modélisation agronomique et hydrologique a été mise en œuvre avec le logiciel Swat, un outil alliant analyse spatiale et simulation, qui doit permettre de donner des orientations et de prioriser des solutions.

  12. Local gene regulation details a recognition code within the LacI transcriptional factor family.

    Directory of Open Access Journals (Sweden)

    Francisco M Camas

    2010-11-01

    Full Text Available The specific binding of regulatory proteins to DNA sequences exhibits no clear patterns of association between amino acids (AAs and nucleotides (NTs. This complexity of protein-DNA interactions raises the question of whether a simple set of wide-coverage recognition rules can ever be identified. Here, we analyzed this issue using the extensive LacI family of transcriptional factors (TFs. We searched for recognition patterns by introducing a new approach to phylogenetic footprinting, based on the pervasive presence of local regulation in prokaryotic transcriptional networks. We identified a set of specificity correlations--determined by two AAs of the TFs and two NTs in the binding sites--that is conserved throughout a dominant subgroup within the family regardless of the evolutionary distance, and that act as a relatively consistent recognition code. The proposed rules are confirmed with data of previous experimental studies and by events of convergent evolution in the phylogenetic tree. The presence of a code emphasizes the stable structural context of the LacI family, while defining a precise blueprint to reprogram TF specificity with many practical applications.

  13. In vitro transcription accurately predicts lac repressor phenotype in vivo in Escherichia coli

    Directory of Open Access Journals (Sweden)

    Matthew Almond Sochor

    2014-07-01

    Full Text Available A multitude of studies have looked at the in vivo and in vitro behavior of the lac repressor binding to DNA and effector molecules in order to study transcriptional repression, however these studies are not always reconcilable. Here we use in vitro transcription to directly mimic the in vivo system in order to build a self consistent set of experiments to directly compare in vivo and in vitro genetic repression. A thermodynamic model of the lac repressor binding to operator DNA and effector is used to link DNA occupancy to either normalized in vitro mRNA product or normalized in vivo fluorescence of a regulated gene, YFP. An accurate measurement of repressor, DNA and effector concentrations were made both in vivo and in vitro allowing for direct modeling of the entire thermodynamic equilibrium. In vivo repression profiles are accurately predicted from the given in vitro parameters when molecular crowding is considered. Interestingly, our measured repressor–operator DNA affinity differs significantly from previous in vitro measurements. The literature values are unable to replicate in vivo binding data. We therefore conclude that the repressor-DNA affinity is much weaker than previously thought. This finding would suggest that in vitro techniques that are specifically designed to mimic the in vivo process may be necessary to replicate the native system.

  14. Radio emission from quasars and BL Lac objects by coherent plasma oscillation and stimulated Compton scattering

    International Nuclear Information System (INIS)

    Colgate, S.A.; Petschek, A.G.

    1978-01-01

    The full radiation spectrum of quasars and BL Lac objects is interpreted as due to a dependent combination of a soft plasma oscillation source at 2ν/sub P/ and bremsstrahlung. Previous work of the plasma oscillation radiation is extended into the radio part of the spectrum and it is shown how the high brightness temperature observations of BL Lac objects [kT/sub b/ (100 MHz) approximate = 3 x 10 5 mc 2 ] are a reasonable consequence of a lower external plasma density and ejection as required for the observed lack of emission lines. Two extreme cases are considered, the one where the plasma oscillations are suddenly extinguished and only stimulated Compton scattering remains and a second case of a constant source of plasma oscillations but a graded surface density. The first case gives 1/100 of the required brightness temperature and the second gives 100 times too large a brightness temperature and also a x 10 too large a radius. It is believed reasonable to invoke a combination of both processes to explain the observed radio spectrum. This model circumvents the self-Compton x-ray flux difficulty of incoherent synchrotron emission

  15. Purified reconstituted lac carrier protein from Escherichia coli is fully functional.

    Science.gov (United States)

    Viitanen, P; Garcia, M L; Kaback, H R

    1984-03-01

    Proteoliposomes reconstituted with lac carrier protein purified from the plasma membrane of Escherichia coli catalyze each of the translocation reactions typical of the beta-galactoside transport system (i.e., active transport, counterflow, facilitated influx and efflux) with turnover numbers and apparent Km values comparable to those observed in right-side-out membrane vesicles. Furthermore, detailed kinetic studies show that the reconstituted system exhibits properties analogous to those observed in membrane vesicles. Imposition of a membrane potential (delta psi, interior negative) causes a marked decrease in apparent Km (by a factor of 7 to 10) with a smaller increase in Vmax (approximately equal to 3-fold). At submaximal values of delta psi, the reconstituted carrier exhibits biphasic kinetics, with one component manifesting the kinetic parameters of active transport and the other exhibiting the characteristics of facilitated diffusion. Finally, at low lactose concentrations, the initial velocity of influx varies linearly with the square of the proton electro-chemical gradient. The results provide quantitative support for the contention that a single polypeptide species, the product of the lac y gene, is responsible for each of the transport reactions typical of the beta-galactoside transport system.

  16. Dynamics and bistability in a reduced model of the lac operon

    Science.gov (United States)

    Yildirim, Necmettin; Santillán, Moisés; Horike, Daisuke; Mackey, Michael C.

    2004-06-01

    It is known that the lac operon regulatory pathway is capable of showing bistable behavior. This is an important complex feature, arising from the nonlinearity of the involved mechanisms, which is essential to understand the dynamic behavior of this molecular regulatory system. To find which of the mechanisms involved in the regulation of the lac operon is the origin of bistability, we take a previously published model which accounts for the dynamics of mRNA, lactose, allolactose, permease and β-galactosidase involvement and simplify it by ignoring permease dynamics (assuming a constant permease concentration). To test the behavior of the reduced model, three existing sets of data on β-galactosidase levels as a function of time are simulated and we obtain a reasonable agreement between the data and the model predictions. The steady states of the reduced model were numerically and analytically analyzed and it was shown that it may indeed display bistability, depending on the extracellular lactose concentration and growth rate.

  17. NEW HIGH- z FERMI BL LACS WITH THE PHOTOMETRIC DROPOUT TECHNIQUE

    Energy Technology Data Exchange (ETDEWEB)

    Kaur, A.; Ajello, M.; Hartmann, D. H.; Paliya, V. S. [Department of Physics and Astronomy, Clemson University, SC 29634-0978 (United States); Rau, A.; Greiner, J.; Bolmer, J.; Schady, P. [Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße 1, D-85748 Garching (Germany); Domínguez, A., E-mail: akaur@g.clemson.edu [Grupo de Altas Energías, Universidad Complutense, E-28040 Madrid (Spain)

    2017-01-01

    Determining redshifts for BL Lacertae (BL Lac) objects using the traditional spectroscopic method is challenging due to the absence of strong emission lines in their optical spectra. We employ the photometric dropout technique to determine redshifts for this class of blazars using the combined 13 broadband filters from Swift -UVOT and the multi-channel imager GROND at the MPG 2.2 m telescope at ESO's La Silla Observatory. The wavelength range covered by these 13 filters extends from far-ultraviolet to the near-infrared. We report results on 40 new Fermi- detected BL Lacs with the photometric redshift determinations for five sources, with 3FGL J1918.2–4110 being the most distant in our sample at z  = 2.16. Reliable upper limits are provided for 20 sources in this sample. Using the highest energy photons for these Fermi -LAT sources, we evaluate the consistency with the gamma-ray horizon due to the extragalactic background light.

  18. Intelligent Local Avoided Collision (iLAC) MAC Protocol for Very High Speed Wireless Network

    Science.gov (United States)

    Hieu, Dinh Chi; Masuda, Akeo; Rabarijaona, Verotiana Hanitriniala; Shimamoto, Shigeru

    Future wireless communication systems aim at very high data rates. As the medium access control (MAC) protocol plays the central role in determining the overall performance of the wireless system, designing a suitable MAC protocol is critical to fully exploit the benefit of high speed transmission that the physical layer (PHY) offers. In the latest 802.11n standard [2], the problem of long overhead has been addressed adequately but the issue of excessive colliding transmissions, especially in congested situation, remains untouched. The procedure of setting the backoff value is the heart of the 802.11 distributed coordination function (DCF) to avoid collision in which each station makes its own decision on how to avoid collision in the next transmission. However, collision avoidance is a problem that can not be solved by a single station. In this paper, we introduce a new MAC protocol called Intelligent Local Avoided Collision (iLAC) that redefines individual rationality in choosing the backoff counter value to avoid a colliding transmission. The distinguishing feature of iLAC is that it fundamentally changes this decision making process from collision avoidance to collaborative collision prevention. As a result, stations can avoid colliding transmissions with much greater precision. Analytical solution confirms the validity of this proposal and simulation results show that the proposed algorithm outperforms the conventional algorithms by a large margin.

  19. An Analysis of Periodic Components in BL Lac Object S5 0716 +714 with MUSIC Method

    Science.gov (United States)

    Tang, J.

    2012-01-01

    Multiple signal classification (MUSIC) algorithms are introduced to the estimation of the period of variation of BL Lac objects.The principle of MUSIC spectral analysis method and theoretical analysis of the resolution of frequency spectrum using analog signals are included. From a lot of literatures, we have collected a lot of effective observation data of BL Lac object S5 0716 + 714 in V, R, I bands from 1994 to 2008. The light variation periods of S5 0716 +714 are obtained by means of the MUSIC spectral analysis method and periodogram spectral analysis method. There exist two major periods: (3.33±0.08) years and (1.24±0.01) years for all bands. The estimation of the period of variation of the algorithm based on the MUSIC spectral analysis method is compared with that of the algorithm based on the periodogram spectral analysis method. It is a super-resolution algorithm with small data length, and could be used to detect the period of variation of weak signals.

  20. Northern hemisphere mid-latitude geomagnetic anomaly revealed from Levantine Archaeomagnetic Compilation (LAC).

    Science.gov (United States)

    Shaar, R.; Tauxe, L.; Agnon, A.; Ben-Yosef, E.; Hassul, E.

    2015-12-01

    The rich archaeological heritage of Israel and nearby Levantine countries provides a unique opportunity for archaeomagnetic investigation in high resolution. Here we present a summary of our ongoing effort to reconstruct geomagnetic variations of the past several millennia in the Levant at decadal to millennial resolution. This effort at the Southern Levant, namely the "Levantine Archaeomagnetic Compilation" (LAC), presently consists of data from over 650 well-dated archaeological objects including pottery, slag, ovens, and furnaces. In this talk we review the methodological challenges in achieving a robust master secular variation curve with realistic error estimations from a large number of different datasets. We present the current status of the compilation, including the southern and western Levant LAC data (Israel, Cyprus, and Jordan) and other published north-eastern Levant data (Syria and southern Turkey), and outline the main findings emerging from these data. The main feature apparent from the new compilation is an extraordinary intensity high that developed over the Levant region during the first two millennia BCE. The climax of this event is a double peak intensity maximum starting at ca. 1000 BCE and ending at ca. 735 BCE, accompanied with at least two events of geomagnetic spikes. Paleomagnetic directions from this period demonstrate anomalies of up to 20 degrees far from the averaged GAD field. This leads us to postulate that the maximum in the intensity is a manifestation of an intense mid-latitude local positive geomagnetic anomaly that persisted for over two centuries.

  1. Le plurilinguisme du perroquet

    Directory of Open Access Journals (Sweden)

    Manuel Mühlbacher

    2012-05-01

    Full Text Available La figure du perroquet occupe une position ambiguë face à la question de la traduction. Il est capable d’imiter des paroles en toutes les langues, mais il n’est capable d’en comprendre aucune — il ne peut que répéter des sons, c’est-à-dire des signifiants. Le traducteur semble faire le contraire quand il passe d’une langue à une autre en tâchant de transmettre une signification semblable par d’autres signes. L’article vise à discuter le rôle du traducteur et sa relation, éventuellement équivoque, au perroquet, en analysant la traduction allemande de Trois Contes par André Stoll et Cora van Kleffens. Un décalage au niveau sémantique peut éclairer l’interprétation du texte, par exemple en explicitant des allusions sous-jacentes, tandis que le transfert de la syntaxe française en allemand pose souvent des problèmes considérables. Comment le traducteur peut-il reproduire des structures syntaxiques qui n’existent pas en allemand, mais qui ne cessent de revenir dans le texte français ? Que faire si le texte se met à jouer au perroquet et finit par se singer lui-même ? André Stoll et Cora van Kleffens ont su trouver des stratégies pour affronter ces difficultés.The figure of the parrot holds an ambiguous position towards the question of translation. It is able to imitate all languages, but it will never understand any of them – its only skill is to mimic sounds, i.e. mere signifiers. On the contrary, the translator seems to be the antithesis of the parrot when he moves from one language to another. He endeavours to convey a similar meaning, but by different signs. The article aims at discussing the role of the translator and his or her eventually equivocal relation to the parrot by means of analysing the German translation of Trois Contes by André Stoll and Cora van Kleffens. Whereas a semantic divergence can result in a different tendency on the level of interpretation, as in the case of an underlying

  2. Lipofection of rabbit chondrocytes and long lasting expression of a lacZ reporter system in alginate beads.

    Science.gov (United States)

    Stöve, J; Fiedler, J; Huch, K; Günther, K-P; Puhl, W; Brenner, R

    2002-03-01

    Our aim was to investigate the maintenance of the transfection status of non-viral transfected chondrocytes in an alginate culture system. Chondrocytes harvested from rabbit knees were isolated by sequential digestion and cultivated in monolayer culture. At 60-70% cell density, chondrocytes were transfected with different transfection systems (FuGENE6, CaCl2, Lipofectin). A lac Z expression vector (pcDNA 3.1/Myc-His+ lacZ) was used as a reporter system. In order to improve transfection rates, hyaluronidase (4 U/ml) was used prior and during the transfection procedure. Thereafter, transfected cells were either kept in monolayer culture or embedded in alginate beads and kept in culture for up to the next 30 weeks. Transfection efficiency was maximal using FuGENE6TM/DNA at a ratio of 3:2 and hyaluronidase (4 U/ml). Transfection efficiency reached up to 40.8% (+/- 3.2%) after 36 h. In alginate beads lac Z positive cells declined to 8.5% +/- 3.3% after 4 weeks and to 4.6% +/- 3.2% after 12 weeks of culturing. After 30 weeks 3% of chondrocytes still expressed lac Z. In contrast, during culturing in monolayer, no lac Z expression was detectable after 4 weeks. Differentiation status of the chondrocytes was confirmed by histology and immunohistochemistry methods. After successful gene transfer to rabbit chondrocytes the alginate system made it possible to culture lipofected chondrocytes phenotypically stable. Genetically engineered chondrocytes express the lac Z reporter gene over a period of at least 30 weeks. This transfection and culture system provides a promising tool to further investigate the over-expression of growth factors and enzyme inhibitors. Copyright 2002 OsteoArthritis Research Society International.

  3. Etat Du Magnesium Dans Quelques Sols Sales Du Sud Et Du ...

    African Journals Online (AJOL)

    étude a été réalisée sur 86 échantillons de sols provenant du Centre et du Sud de l´Irak. L\\'expérimentation a consisté, d´une part, à calculer les différents sels dominants dans les sols salés par la méthode de combinaison hypothétique et, ...

  4. lacZ transduced human breast cancer xenografts as an in vivo model for the study of invasion and metastasis

    DEFF Research Database (Denmark)

    Brünner, N; Thompson, E W; Spang-Thomsen, M

    1992-01-01

    in the animals by usual histological procedures would require extensive sectioning of the whole animal. To overcome this problem, we transduced human breast cancer cells with a replication-defective Moloney murine leukaemia retroviral vector (M-MuLV) containing both neoR (neomycin resistance) and lacZ genes...... but not the surrounding mouse tissue on either whole tissue blocks or histological sections. The staining procedure was highly sensitive, allowing detection of microfoci of human cancer cells, and quantitative estimation of the metastatic capacity of the cells. These results indicate that lacZ transduction of human...

  5. Characterization of pLAC1, a cryptic plasmid isolated from Lactobacillus acidipiscis and comparative analysis with its related plasmids.

    Science.gov (United States)

    Asteri, Ioanna-Areti; Papadimitriou, Konstantinos; Boutou, Effrossyni; Anastasiou, Rania; Pot, Bruno; Vorgias, Constantinos E; Tsakalidou, Effie

    2010-07-15

    The pLAC1 plasmid of Lactobacillus acidipiscis ACA-DC 1533, a strain isolated from traditional Kopanisti cheese, was characterised. Nucleotide sequence analysis revealed a circular molecule of 3478bp with a G+C content of 37.2%. Ab initio annotation indicated four putative open reading frames (orfs). orf1 and orf4 were found to encode a replication initiation protein (Rep) and a mobilization protein (Mob), respectively. The deduced products of orf2 and orf3 revealed no significant homology to other known proteins. However, in silico examination of the plasmid sequence supported the existence of a novel operon that includes rep, orf2 and orf3 in pLAC1 and that this operon is highly conserved also in plasmids pLB925A02, pSMA23, pLC88 and pC7. RT-PCR experiments allowed us to verify that these three genes are co-transcribed as a single polycistronic mRNA species. Furthermore, phylogenetic analysis of pLAC1 Rep and Mob proteins demonstrated that they may have derived from different plasmid origins, suggesting that pLAC1 is a product of a modular evolution process. Comparative analysis of full length nucleotide sequences of pLAC1 and related Lactobacillus plasmids showed that pLAC1 shares a very similar replication backbone with pLB925A02, pSMA23 and pLC88. In contrast, mob of pLAC1 was almost identical with the respective gene of plasmids pLAB1000, pLB4 and pPB1. These findings lead to the conclusion that pLAC1 acquired mob probably via an ancestral recombination event. Our overall work highlights the importance of characterizing plasmids deriving from non-starter 'wild' isolates in order to better appreciate plasmid divergence and evolution of lactic acid bacteria. 2010 Elsevier B.V. All rights reserved.

  6. Le bal du loup

    CERN Multimedia

    Happy Children's Home

    2013-01-01

    The Bord'eau amateur theatre group will graciously perform a play of their creation Le bal du loup Saturday 19 October 2013 at 20:00 Sunday 20 October at 17:00 in the Théâtre des Grottes Rue Louis Favre 43, 1201 Genève Children from age 12 upwards. Summary: The new-elected mayoress of a small village would like to clean up the town by prohibiting alcohol and getting rid of its prostitutes. Then along comes « Massimo Lupo » the pimp... The performances will be given to support the Happy Children's Home charity, which runs a foster-home in Pokhara for Nepali children:  http://www.happychildrenshome.org/ Admission : minimum charge of 10 CHF per person requested, to cover the cost of technical assistance and theatre rental. Any profit will be used solely for the foster-home. At the end of each performance members of the HCH charity will be happy to answer any questions you may have. The theatre has 86 seats, thank you for reserv...

  7. Cadre Institutionnel en Afrique de L'Ouest et du Centre en Matiere ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    akaere

    ACDI : Agence de Coopération pour le Développement International. ACMAD ... CGIAR : Groupe consultatif pour la recherche agricole internationale ..... bassin, les institutions scientifiques et de recherche, les organisations paysannes, les.

  8. Effets de la microdose sur la production du niébé, du mil et du ...

    African Journals Online (AJOL)

    Effets de la microdose sur la production du niébé, du mil et du sorgho en fonction la toposéquence. Fatimata Saba, Sibiri Jean Baptiste Taonda, Idriss Serme, Alimata A. Bandaogo, Augustin P. Sourwema, Adama Kabre ...

  9. A set of lacZ mutations in Escherichia coli that allow rapid detection of each of the six base substitutions

    International Nuclear Information System (INIS)

    Cupples, C.G.; Miller, J.H.

    1989-01-01

    We describe the construction of six strains of Escherichia coli with different mutations at the same coding position in the lacZ gene, which specifies the active site glutamic acid residue at position 461 in beta'-galactosidase. Each strain is Lac- and reverts to Lac+ only by restoring the glutamic acid codon. The strains have been designed so that each reverts via one of the six base substitutions. The set of strains allows detection of each transition and transversion simply by monitoring the Lac- to Lac+ frequency, as demonstrated here with characterized mutagens and mutator alleles. These strains are useful for rapidly determining the mutagenic specificity of mutagens at a single site, for detecting low levels of stimulation of certain base substitutions, for monitoring specific base changes in response to various experimental conditions or strain backgrounds, and for isolating new mutator strains

  10. Dynamique des populations du foreur des tiges du cacaoyer ...

    African Journals Online (AJOL)

    SARAH

    30 nov. 2014 ... déprédateur dans la région du Haut-Sassandra, la deuxième plus grande région de production de cacao en. Côte d'ivoire. Méthodologie et résultats : L'étude a été réalisée de 2009 à 2013 dans les plantations villageoises de la région du Haut-Sassandra en Côte d'Ivoire. Les variations des taux d'attaques ...

  11. Dynamique des populations du foreur des tiges du cacaoyer ...

    African Journals Online (AJOL)

    Objectif : Le foreur de tiges du cacaoyer, Eulophonotus myrmeleon Felder cause aujourd'hui d'énormes dégâts dans les cacaoyères ivoiriennes. La présente étude vise à déterminer les périodes de fortes attaques de ce déprédateur dans la région du Haut-Sassandra, la deuxième plus grande région de production de ...

  12. Gestion durable du paysage

    Directory of Open Access Journals (Sweden)

    Jean-David Gerber

    2009-03-01

    Full Text Available Le paysage est de plus en plus perçu comme une ressource. À ce titre, il est nécessaire de trouver des instruments juridiques, politiques ou économiques susceptibles de gérer cette « ressource-paysage » sur le long terme. Le gouvernement suisse a introduit récemment l’instrument des parcs naturels régionaux, organisés selon le modèle français, dans sa législation de protection de la nature et du paysage. Une mise en regard des nouveaux parcs avec des structures de gestion beaucoup plus anciennes, les bourgeoisies et les corporations, permet de mettre en évidence les forces et les faiblesses de chacun de ces instruments dans leur contribution à résoudre les rivalités d’usage entre acteurs utilisant ou influençant la ressource paysage. Cette comparaison permet de formuler des recommandations pratiques concernant la gestion de cette ressource.The landscape is increasingly perceived as a resource. For this reason, it is necessary to find legal, political and economic instruments that will succeed in managing this “resource landscape” in the long term. The Swiss government recently introduced the instrument of regional nature parks into the legislation governing nature and landscape preservation; the proposed parks are organized on the basis of the French model. The examination of the new parks from the perspective of much older management structures, i.e. the civic municipalities (bourgeoisies and corporations, makes it possible to demonstrate the strengths and weaknesses of each of these instruments in their contribution to the resolution of use rivalries between actors who use or influence the resource landscape. This comparison also enables the formulation of practical recommendations regarding the management of this resource.

  13. Le Developmental Entrepreneurship Program du Massachusetts ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Faire en sorte que les étudiants venant des pays en développement pour étudier au MIT retournent ensuite dans leurs pays respectifs afin d'y concrétiser leurs idées est un souci majeur du MIT, des bailleurs de fonds et du milieu du développement. Ce projet palliera à ce souci en soutenant la formation des fellows du ...

  14. The UV spectrum of the BL Lac object PKS 0521-36

    International Nuclear Information System (INIS)

    Danziger, I.J.; Bergeron, J.; Maraschi, L.; Treves, A.; Milan Univ.; Tanzi, E.G.

    1983-01-01

    Ultraviolet observations (1200 to 3000 A) with the IUE satellite of the BL Lac object PKS 0521-36 are presented. The only emission line which appears clearly in the spectrum is Lyα, which is asymmetric with a component displaced approx. 3000 km s - 1 to the red. The intensity of the line and the upper limits on other lines are compared with the model calculations on QSOs and Seyfert nuclei by Kwan and Krolik. The continuous energy distribution is discussed, combining non-simultaneous observations from the ultraviolet to the infrared. The spectral range of the non-thermal source from far IR to far UV can be described by a single power law of index -1.5. (author)

  15. UV spectrum of the BL Lac object PKS 0521-36

    Energy Technology Data Exchange (ETDEWEB)

    Danziger, I.J. (European Southern Observatory, Garching (Germany, F.R.)); Bergeron, J. (Centre National de la Recherche Scientifique, 75 - Paris (France). Inst. d' Astrophysique); Fosbury, R.A.E. (Royal Greenwich Observatory, Hailsham (UK)); Maraschi, L.; Treves, A. (Consiglio Nazionale delle Ricerche, Milan (Italy). Lab. di Fisica Cosmica; Milan Univ. (Italy). Ist. di Fisica); Tanzi, E.G. (Consiglio Nazionale delle Ricerche, Milan (Italy). Lab. di Fisica Cosmica)

    1983-05-01

    Ultraviolet observations (1200 to 3000 A) with the IUE satellite of the BL Lac object PKS 0521-36 are presented. The only emission line which appears clearly in the spectrum is Ly..cap alpha.., which is asymmetric with a component displaced approx. 3000 km s/sup -1/ to the red. The intensity of the line and the upper limits on other lines are compared with the model calculations on QSOs and Seyfert nuclei by Kwan and Krolik. The continuous energy distribution is discussed, combining non-simultaneous observations from the ultraviolet to the infrared. The spectral range of the non-thermal source from far IR to far UV can be described by a single power law of index -1.5.

  16. Isolation and characterization of Tn917lac-generated competence mutants of Bacillus subtilis

    International Nuclear Information System (INIS)

    Hahn, J.; Albano, M.; Dubnau, D.

    1987-01-01

    The authors isolated 28 mutants of Bacillus subtilis deficient in the development of competence by using the transposon Tn917lacZ as a mutagen. The mutant strains were poorly transformable with plasmid and chromosomal DNAs but were normally transducible and exhibited wild-type resistance to DNA-damaging agents. The mutations were genetically mapped, and the mutants were characterized with respect to their abilities to bind and take up radiolabeled DNA. All were defective in uptake, and some failed to bind significantly amounts of DNA. The abilities of the mutant strains to resolve into two buoyant density classes on Renografin gradients were studied. Most resolved normally, but several banded in Renografin only at the buoyant density of noncompetent cells. The genetic mapping studies and the other analyses suggested that the mutations define a minimum of seven distinct com genes

  17. Geology and age of the Lac a la Perdrix fenite, southern Gatineau district, Quebec

    International Nuclear Information System (INIS)

    Hogarth, D.D.

    1996-01-01

    The Lac a Ia Perdrix fenite lies in the Central Metasedimentary Belt of the Grenville Province. This 30 m wide fenite, adjacent to a narrow calciocarbonatite sill, replaces diopside-oligoclase gneiss and is composed of magnesio-arfvedsonite, aegirine, microcline, albite, and fluorapatite. Near the contact with carbonatite, it contains appreciable monazite and barite whereas aegirine virtually disappears. Fenitization probably took place early in the igneous stage of carbonatite development. A Pb/U monazite age of 1026 ± 2 Ma is thought to date fenite formation. Together with published data, this age shows that carbonatite intruded metamorphic rocks near the close of the Grenville Orogeny. (author). 33 refs., 4 tabs., 5 figs

  18. The ultraviolet to X-ray continua of BL Lac objects

    International Nuclear Information System (INIS)

    George, I.M.; Warwick, R.S.; McHardy, I.M.

    1988-01-01

    The results from EXOSAT observations of three X-ray bright BL Lacertae objects, Mrk 501, 1218 + 304 and Mrk 180 are presented. All three sources have soft power-law X-ray spectra with low-energy cut-offs consistent with absorption in the line-of-sight gas column density through our own galaxy. The three objects also exhibit significant spectral variability in the X-ray band on time-scales ranging from a few days to a year. In each case, X-ray flux and spectral index appear to be correlated, in the sense that the X-ray spectrum hardens as the source brightens. The intrinsic ultraviolet to X-ray spectrum of these and several other X-ray bright BL Lac objects can be modelled as a power-law continuum of energy index ∼1.0 below about 0.1 keV, above which the spectral slope steepens. (author)

  19. Gene fusions with lacZ by duplication insertion in the radioresistant bacterium Deinococcus radiodurans

    International Nuclear Information System (INIS)

    Lennon, E.; Minton, K.W.

    1990-01-01

    Deinococcus radiodurans is the most-studied species of a eubacterial family characterized by extreme resistance to DNA damage. We have focused on developing molecular biological techniques to investigate the genetics of this organism. We report construction of lacZ gene fusions by a method involving both in vitro splicing and the natural transformation of D. radiodurans. Numerous fusion strains were identified by expression of beta-galactosidase. Among these fusion strains, several were inducible by exposure to the DNA-damaging agent mitomycin C, and four of the inducible fusion constructs were cloned in Escherichia coli. Hybridization studies indicate that one of the damage-inducible genes contains a sequence reiterated throughout the D. radiodurans chromosome. Survival measurements show that two of the fusion strains have increased sensitivity to mitomycin C, suggesting that the fusions within these strains inactivate repair functions

  20. p21-LacZ reporter mice reflect p53-dependent toxic insult

    International Nuclear Information System (INIS)

    Vasey, Douglas B.; Wolf, C. Roland; MacArtney, Thomas; Brown, Ken; Whitelaw, C. Bruce A.

    2008-01-01

    There is an urgent need to discover less toxic and more selective drugs to treat disease. The use of transgenic mice that report on toxic insult-induced transcription can provide a valuable tool in this regard. To exemplify this strategy, we have generated transgenic mice carrying a p21-LacZ transgene. Transgene activity reflected endogenous p21 gene activation in various tissues, displayed compound-specific spatial expression signatures in the brain and immune tissues and enabled p53-dependent and p53-independent responses to be identified. We discuss the application of these mice in delineating the molecular events in normal cellular growth and disease and for the evaluation of drug toxicity

  1. Spectroscopy of 10 γ -Ray BL Lac Objects at High Redshift

    Energy Technology Data Exchange (ETDEWEB)

    Paiano, Simona; Falomo, Renato [INAF, Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, I-35122 Padova (Italy); Landoni, Marco [INAF, Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate (Italy); Treves, Aldo [Università degli Studi dell’Insubria, Via Valleggio 11, I-22100 Como (Italy); Scarpa, Riccardo [Instituto de Astrofisica de Canarias, C/O Via Lactea, s/n E-38205 La Laguna, Tenerife (Spain)

    2017-08-01

    We present optical spectra with high signal-to-noise ratio of 10 BL Lac objects detected at GeV energies by the Fermi satellite (3FGL catalog), which previous observations suggested are at relatively high redshift. The new observations, obtained at the 10 m Gran Telescopio Canarias, allowed us to find the redshift for J0814.5+2943 ( z = 0.703), and we can set a spectroscopic lower limit for J0008.0+4713 ( z > 1.659) and J1107.7+0222 ( z > 1.0735) on the basis of Mg ii intervening absorption features. In addition we confirm the redshifts for J0505.5+0416 ( z = 0.423) and J1450+5200 ( z > 2.470). Finally we contradict the previous z estimates for five objects (J0049.7+0237, J0243.5+7119, J0802.0+1005, J1109.4+2411, and J2116.1+3339).

  2. Les dispositifs du Net art

    OpenAIRE

    Fourmentraux, Jean-Paul

    2010-01-01

    La pratique du Net art radicalise la question du potentiel communicationnel d’un média —Internet— qui constitue tout à la fois le support technique, l’outil créatif et le dispositif social de l’œuvre. Les technologies de l’information et de la communication (TIC) placent en effet l’œuvre d’art au cœur d’une négociation socialement distribuée entre l’artiste et le public. L’article est focalisé sur cette construction collective du Net art et sur ses mises en scènes. Il montre le travail artist...

  3. 78 FR 3911 - Big Stone National Wildlife Refuge, Big Stone and Lac Qui Parle Counties, MN; Final Comprehensive...

    Science.gov (United States)

    2013-01-17

    ... DEPARTMENT OF THE INTERIOR Fish and Wildlife Service [FWS-R3-R-2012-N259; FXRS1265030000-134-FF03R06000] Big Stone National Wildlife Refuge, Big Stone and Lac Qui Parle Counties, MN; Final Comprehensive... significant impact (FONSI) for the environmental assessment (EA) for Big Stone National Wildlife Refuge...

  4. Discovery of Intermediates of lacZ β-Galactosidase Catalyzed Hydrolysis Using dDNP NMR

    DEFF Research Database (Denmark)

    Kjeldsen, Christian; Ardenkjær-Larsen, Jan Henrik; Duus, Jens Ø.

    2018-01-01

    Using dissolution dynamic nuclear polarization, the sensitivity of single scan solution state 13C NMR can be improved up to 4 orders of magnitude. In this study, the enzyme lacZ β-galactosidase from Escherichia coli was subjected to hyperpolarized substrate, and previously unknown reaction...

  5. Discovery of Intermediates of lacZ beta-Galactosidase Catalyzed Hydrolysis Using dDNP NMR

    DEFF Research Database (Denmark)

    Kjeldsen, Christian; Ardenkjær-Larsen, Jan Henrik; Duus, Jens Øllgaard

    2018-01-01

    Using dissolution dynamic nuclear polarization, the sensitivity of single scan solution state C-13 NMR can be improved up to 4 orders of magnitude. In this study, the enzyme lacZ beta-galactosidase from Escherichia coli was subjected to hyperpolarized substrate, and previously unknown reaction...

  6. Bird communities of contrasting semi-natural habitats of Lac bay, Bonaire, during the fall migration season, 2011

    NARCIS (Netherlands)

    Debrot, A.O.; Bemmelen, van R.S.A.; Ligon, J.

    2013-01-01

    The mangrove and seagrass lagoon of Lac Bay on Bonaire covers an area of roughly 700 ha. It is home to endangered green sea turtles, Chelonia mydas, and the Caribbean queen conch, Strombus gigas, and is a roosting and breeding area for several birds. Based on its nature values this 7 km2 bay has

  7. 94 Mise en place d'une base de données pour une modélisation ...

    African Journals Online (AJOL)

    AKA BOKO

    L'objectif de cette étude est de fournir les paramètres physiques du bassin versant ... certains procèdent par une approche globale et considère le bassin comme ... du Bandama, à l'instar de la plupart des bassins sub-sahéliens, ne dispose.

  8. Interplay of protein and DNA structure revealed in simulations of the lac operon.

    Directory of Open Access Journals (Sweden)

    Luke Czapla

    Full Text Available The E. coli Lac repressor is the classic textbook example of a protein that attaches to widely spaced sites along a genome and forces the intervening DNA into a loop. The short loops implicated in the regulation of the lac operon suggest the involvement of factors other than DNA and repressor in gene control. The molecular simulations presented here examine two likely structural contributions to the in-vivo looping of bacterial DNA: the distortions of the double helix introduced upon association of the highly abundant, nonspecific nucleoid protein HU and the large-scale deformations of the repressor detected in low-resolution experiments. The computations take account of the three-dimensional arrangements of nucleotides and amino acids found in crystal structures of DNA with the two proteins, the natural rest state and deformational properties of protein-free DNA, and the constraints on looping imposed by the conformation of the repressor and the orientation of bound DNA. The predicted looping propensities capture the complex, chain-length-dependent variation in repression efficacy extracted from gene expression studies and in vitro experiments and reveal unexpected chain-length-dependent variations in the uptake of HU, the deformation of repressor, and the folding of DNA. Both the opening of repressor and the presence of HU, at levels approximating those found in vivo, enhance the probability of loop formation. HU affects the global organization of the repressor and the opening of repressor influences the levels of HU binding to DNA. The length of the loop determines whether the DNA adopts antiparallel or parallel orientations on the repressor, whether the repressor is opened or closed, and how many HU molecules bind to the loop. The collective behavior of proteins and DNA is greater than the sum of the parts and hints of ways in which multiple proteins may coordinate the packaging and processing of genetic information.

  9. The NuSTAR view on Hard-TeV BL Lacs

    Science.gov (United States)

    Costamante, L.; Bonnoli, G.; Tavecchio, F.; Ghisellini, G.; Tagliaferri, G.; Khangulyan, D.

    2018-05-01

    Hard-TeV BL Lacs are a new type of blazars characterized by a hard intrinsic TeV spectrum, locating the peak of their gamma-ray emission in the spectral energy distribution (SED) above 2-10 TeV. Such high energies are problematic for the Compton emission, using a standard one-zone leptonic model. We study six examples of this new type of BL Lacs in the hard X-ray band with NuSTAR. Together with simultaneous observations with the Neil Gehrels Swift Observatory, we fully constrain the peak of the synchrotron emission in their SED, and test the leptonic synchrotron self-Compton (SSC) model. We confirm the extreme nature of 5 objects also in the synchrotron emission. We do not find evidence of additional emission components in the hard X-ray band. We find that a one-zone SSC model can in principle reproduce the extreme properties of both peaks in the SED, from X-ray up to TeV energies, but at the cost of i) extreme electron energies with very low radiative efficiency, ii) conditions heavily out of equipartition (by 3 to 5 orders of magnitude), and iii) not accounting for the simultaneous UV data, which then should belong to a different emission component, possibly the same as the far-IR (WISE) data. We find evidence of this separation of the UV and X-ray emission in at least two objects. In any case, the TeV electrons must not "see" the UV or lower-energy photons, even if coming from different zones/populations, or the increased radiative cooling would steepen the VHE spectrum.

  10. Interplay of protein and DNA structure revealed in simulations of the lac operon.

    Science.gov (United States)

    Czapla, Luke; Grosner, Michael A; Swigon, David; Olson, Wilma K

    2013-01-01

    The E. coli Lac repressor is the classic textbook example of a protein that attaches to widely spaced sites along a genome and forces the intervening DNA into a loop. The short loops implicated in the regulation of the lac operon suggest the involvement of factors other than DNA and repressor in gene control. The molecular simulations presented here examine two likely structural contributions to the in-vivo looping of bacterial DNA: the distortions of the double helix introduced upon association of the highly abundant, nonspecific nucleoid protein HU and the large-scale deformations of the repressor detected in low-resolution experiments. The computations take account of the three-dimensional arrangements of nucleotides and amino acids found in crystal structures of DNA with the two proteins, the natural rest state and deformational properties of protein-free DNA, and the constraints on looping imposed by the conformation of the repressor and the orientation of bound DNA. The predicted looping propensities capture the complex, chain-length-dependent variation in repression efficacy extracted from gene expression studies and in vitro experiments and reveal unexpected chain-length-dependent variations in the uptake of HU, the deformation of repressor, and the folding of DNA. Both the opening of repressor and the presence of HU, at levels approximating those found in vivo, enhance the probability of loop formation. HU affects the global organization of the repressor and the opening of repressor influences the levels of HU binding to DNA. The length of the loop determines whether the DNA adopts antiparallel or parallel orientations on the repressor, whether the repressor is opened or closed, and how many HU molecules bind to the loop. The collective behavior of proteins and DNA is greater than the sum of the parts and hints of ways in which multiple proteins may coordinate the packaging and processing of genetic information.

  11. New Light Curves and Analysis of the Overcontact Binaries PP Lac and DK Sge

    Science.gov (United States)

    Sanders, S. J.; Hargis, J. R.; Bradstreet, D. H.

    2004-12-01

    As a by-product of the ongoing work with the Catalog and AtLas of Eclipsing Binaries database (CALEB; Bradstreet et al. 2004), several hundred eclipsing binary systems have been identified that have either unpublished or poor quality light curves. We present new V & Rc light curves for the overcontact systems PP Lac and DK Sge, both chosen because their deep eclipses (peak-to-peak amplitudes of nearly 0.7 mag) help constrain the light curve modelling. Data were obtained using the 41-cm telescope at the Eastern University Observatory equipped with an SBIG ST-10XME CCD. PP Lac (P= 0.40116 d) is a W-type contact binary with only one previously published light curve (Dumont & Maraziti 1990), but the data are sparse and almost non-existent at primary eclipse. Modelling of these data gave varying results; the published mass ratios differ by nearly 0.3. Our data confirms the noted differing eclipse depths but we find the primary eclipse to be total. We present a new light curve solution using Binary Maker 3 (Bradstreet & Steelman 2002) and Wilson-Devinney, finding the mass ratio to be well-constrained by the duration of total eclipse. A period study will be presented using previously existing and newly derived times of minimum light. DK Sge (P=0.62182 d) appears to be an A-type contact binary with no published light curve. The eclipses are partial, with the primary eclipse being deeper by about 0.08 mag. The maxima show evidence of a slight asymmetry, although the light curve appears to be repeatable over the 1 month of observations. We present the first light curve solution using Binary Maker 3 and Wilson-Devinney, but have limited mass ratio constraints due to the absence of radial velocity data. A period study will be presented using previously existing and newly derived times of minimum light.

  12. Tentative de réacclimatation de Salmo salar dans le bassin de la Bresle (Normandie, France

    Directory of Open Access Journals (Sweden)

    ARRIGNON J.

    2008-09-01

    Full Text Available La BRESLE, rivière séparant la Haute-Normandie de la Picardie, dans le Nord-Ouest de la France était occasionnellement fréquentée jusqu'en 1964 par le saumon de lAtlantique, Salmo Salar. Le Conseil Supérieur de la Pêche a décidé de diriger l'essentiel des moyens consacrés à cette région à la réacclimatation du saumon, à l'« ensaumonnement » de ce cours d'eau. Le choix a été opéré en fonction de la situation hydrographique, hydraulique et hydrobiologique de la rivière. Les travaux ont porté sur la lutte contre la pollution sévissant dans la basse vallée, la lutte contre le braconnage, l'amélioration du milieu aquatique : franchissement d'obstacles à la remontée des salmonidés migrateurs, ameublissement des frayères, enlèvement des prédateurs. Ils ont également porté sur des introductions annuelles d'environ 100.000 oeufs de saumons à des stades divers. Les résultats montrent que le nombre des smolts s'accroît, de même que, en 1972, le nombre des adultes contrôlés et marqués lors de leurs déplacements. Le nombre modeste des uns et des autres ainsi que le caractère récent de cette réapparition du saumon en Bresle ne permettent pas de dire qu'il y a réacclimatation de l'espèce : il s'agit d'un simple indice favorable à la réacclimatation du saumon. L'auteur conclut en pensant que la truite de mer présente dans les cours d'eau de cette région un intérêt supérieur à celui du Saumon mais que, dans le cas particulier de la rivière la BRESLE, l'introduction du saumon est une initiative intéressante pour les pêcheurs sportifs. Il conviendra toutefois de grossir considérablement l'ensaumonnement en introduisant davantage de smolts. Il sera également important de prévoir une réglementation de la pêche assurant le maintien de l'installation du saumon dans cette rivière. The Bresle river, running between upper Normandy and Picardy in the North-Western part of France, saw occasional runs of

  13. L'administration du travail et la production du droit du travail (1906-1960). : Note de synthèse du rapport de recherche

    OpenAIRE

    Le Crom , Jean-Pierre

    2007-01-01

    Synthèse d'un rapport de recherche dont l'objectif est d'appréhender le rôle de l'administration centrale du travail dans la production du droit du travail. Deux dimensions sont explorées : le profil des rédacteurs et l'organisation des structures.

  14. La géochimie organique des sédiments marins profonds, mission orgon 2, 1975 (Bassin de Cariaco et cône de l'Amazone Organic Geochemistry of Deep Marine Sediments. Orgon 2 Mission, 1975 (Cariaco Basin and Amazon Fan

    Directory of Open Access Journals (Sweden)

    Pelet R.

    2006-11-01

    Full Text Available Trois articles distincts traitent, le premier des généralités sur la mission ORLON, les deux autres des résultats obtenus à la mer dans les domaines de la microbiologie et de la biochimie des eaux. En microbiologie, une opposition existe entre le bassin de Cariaco d'une part, milieu anoxique riche en microflore et spécialement en bactéries sulfato-réductrices, et d'autre part la plaine du Demerara et le cône de l'Amazone, où les eaux ont des teneurs médiocres en microflore et les sédiments des teneurs si faibles qu'elles sont inférieures aux teneurs des eaux (phénomène qui n'existe jamais dans les milieux côtiers ou peu profonds. On met en évidence une relation directe entre teneurs en microflore et vitesse de sédimentation, qui permet d'avoir une vision cohérente des résultats obtenus tant à ORLON I qu'à ORLON 2. Dans le domaine de la biochimie des eaux, on a étudié outre l'eau sus-jacente au sédiment, les eaux interstitielles de 95 niveaux sédimentaires des carottes. L'utilisation d'un dispositif spécial de découpage des carottes prélevées à l'aide du carottier Reineck court a permis une étude fine des paramètres physiques (pH, Eh et des constituants chimiques (O, dissous, S-- dissous, PO---, NH4 et alcalinité des eaux interstitielles. L'influence des conditions régnant dans la Cariaco Trench sur la minéralisation de la matière organique a été étudiée au cours de l'enfouissement. Les mesures effectuées dans la mer du Demerara et sur le cône fossile de l'Amazone soulignent l'influence des conditions ambiantes et la pauvreté en matériel organique des régions océaniques profondes. Les dépôts côtiers de l'Amazone et du Para ont également été étudiés. Three separate articles are given. The first deals with general comments on the ORLON cruise, and the other two give the findings obtained on board ship in the fields of microbiology and biochemisiry of water. In microbiology, there is an

  15. 146 Apport de la télédétection à la cartographie de l'évolution spatio ...

    African Journals Online (AJOL)

    SORO GBOMBELE

    Les précisions globales obtenues pour les images classifiées sont de 88,47% ... comportement hydrologique des bassins soudano-sahéliens paraît de fait en pleine ... d'un changement climatique, l'évolution des couverts végétaux, des états de surface ... l'étude de l'occupation du sol dans la région des Lacs a été réalisée.

  16. Production and consumption of B group vitamins in situ.

    OpenAIRE

    Kurata, A

    1984-01-01

    Les variations des concentrations en thiamine, biotine et vitamine B12 dans l'eau des bouteilles immergées in situ pendant 6 heures dans le bassin nord du lac Biwa ont été suivies sur 30 heures. Les concentrations en vitamines varient de façon comparable durant les 6 heures d'immersion. Généralement les concentrations en thiamine, biotine et vitamine B12 présentent des taux élevés le matin et bas le soir, ceci dans les bouteilles immergées comme dans l'eau de mer environnante. Les concentrati...

  17. Réflexion sur l’origine du processus de segmentation du marche du travail

    Directory of Open Access Journals (Sweden)

    Attia Nicole

    2006-01-01

    Full Text Available (francuski Ce travail propose une réflexion sur l'origine du processus de segmentation du marché du travail par rapport à l'entreprise. Se situe-t-elle au sein même de l'entreprise ou en amont, c'est à dire entre les entreprises? Cela revient à se demander si on peut avoir une approche microéconomique ou macroéconomique de la segmentation et, à s'interroger sur le rôle réel tenu par les firmes dans le processus. Déterminant pour la théorie, ce rôle est à repenser selon la réponse apportée à notre question.

  18. Un Nouveau Monde du Savoir

    International Development Research Centre (IDRC) Digital Library (Canada)

    Si les effets de la mondialisation sur l'économie, la politique ou encore les ..... Il souligne l'importance cruciale d'un plan stratégique d'internationalisation, ...... Lors du recrutement de nouveaux professeurs ( lorsque cette situation est ...

  19. rive gauche du fleuve Rimac

    International Development Research Centre (IDRC) Digital Library (Canada)

    tégée du fleuve et les terrains vagues d'une zone industrielle. .... Ces deux diagnostics sont d'importants outils qui contri- bueront à une meilleure planification ... conditions et instruments nécessaires pour améliorer la situation financière des ...

  20. Voorwoord Forward | du Plessis | Lexikos

    African Journals Online (AJOL)

    J.CM.D. du Plessis. Abstract. No Abstract. Full Text: EMAIL FREE FULL TEXT EMAIL FREE FULL TEXT · DOWNLOAD FULL TEXT DOWNLOAD FULL TEXT · AJOL African Journals Online. HOW TO USE AJOL... for Researchers · for Librarians · for Authors · FAQ's · More about AJOL · AJOL's Partners · Terms and Conditions ...

  1. Charte du Conseil des Gouverneurs

    International Development Research Centre (IDRC) Digital Library (Canada)

    Office 2004 Test Drive User

    7. favoriser des communications ouvertes et franches entre le personnel, la direction ..... de dresser le procès-verbal des réunions du Conseil et de ses comités et de veiller à ce ... et des résultats qu'il obtient, et non de sa gestion quotidienne.

  2. Bases biologiques du comportement social

    CERN Document Server

    Laborit, H

    1994-01-01

    Pour bien comprendre le comportement humain dans un environnement social,il est necessaire de comprendre comment fonctionne le systÂ?me nerveux central. L'une des principales fonctions du cerveau est de crÂ?er des relations entre leshumains.. .................

  3. Par-delà l’interdit (haram. Une ethnographie du mariage et de la sexualité chez les Sahraouis du Sud marocain

    Directory of Open Access Journals (Sweden)

    Claire Cécile Mitatre

    2009-03-01

    Full Text Available Par-delà l’interdit (haram. Une ethnographie du mariage et de la sexualité chez les Sahraouis du Sud marocain. Avant de me rendre dans l’Oued Noun, région oasienne du pré-Sahara atlantique, mes lectures sur le monde musulman et le bassin méditerranéen me portaient à penser que, par le mariage, une femme entrait dans le haram de son mari, domaine de l’interdit qu’un galant ne peut enfreindre sans risquer d’être tué par l’époux offensé. Les premiers temps de mon expérience ethnographique, j’interprétais alors le caractère insouciant des invitations galantes que l’on pouvait me faire tout en me sachant mariée, comme une manière détournée d’affirmer que les Occidentaux n’avaient pas de domaine de l’interdit sur lequel étendre leur autorité, et de me renvoyer à mon statut d’étrangère. C’est cependant en prenant les avances des hommes à mon égard comme objet d’analyse que je compris comment, dans cette région présaharienne, le mariage constituait en réalité, pour la femme sahraouie, un rite d’accession aux relations de galanterie : par la perte rituelle de sa virginité, la femme s’affranchit du seul véritable haram auquel elle a jamais appartenu, celui de son père.Beyond the forbidden (haram. An ethnography of marriage and sexuality among the Sahraoui of Southern Morocco. Before going to the Oued Noun, an oasis region of the Atlantic pre-Sahara, my readings on the Muslim world and the Mediterranean basin led me to think that when she married, a woman entered the haram of her husband, a forbidden domain that an admirer can only infringe upon at the risk of being killed by the offended husband. At the beginning of my ethnographic experience, I interpreted the carefree nature of the amorous invitations I received from men who knew I was married as a roundabout way of affirming that Westerners have no forbidden domain to exert their authority over, and to remind me of my status as a

  4. Multi-epoch intranight optical monitoring of eight radio-quiet BL Lac candidates

    Science.gov (United States)

    Kumar, P.; Gopal-Krishna; Stalin, C. S.; Chand, H.; Srianand, R.; Petitjean, P.

    2017-10-01

    For a new sample of eight weak-line quasars (WLQs) we report a sensitive search in 20 intranight monitoring sessions, for blazar-like optical flux variations on hour-like and longer time-scale (day/month/year-like). The sample consists exclusively of the WLQs that are not radio-loud and either have been classified as 'radio-weak probable BL Lac candidates' and/or are known to have exhibited at least one episode of large, blazar-like optical variability. Whereas only a hint of intranight variability is seen for two of these WLQs, J104833.5+620305.0 (z = 0.219) and J133219.6+622715.9 (z = 3.15), statistically significant internight variability at a few per cent level is detected for three of the sources, including the radio-intermediate WLQ J133219.6+622715.9 (z = 3.15) and the well-known bona fide radio-quiet WLQs J121221.5+534128.0 (z = 3.10) and WLQ J153259.9-003944.1 (z = 4.62). In the rest frame, this variability is intraday and in the far-ultraviolet band. On the time-scale of a decade, we find for three of the WLQs large brightness changes, amounting to 1.655 ± 0.009, 0.163 ± 0.010 and 0.144 ± 0.018 mag, for J104833.5+620305.0, J123743.1+630144.9 and J232428.4+144324.4, respectively. Whereas the latter two are confirmed radio-quiet WLQs, the extragalactic nature of J104833.5+620305.0 remains to be well established, thanks to the absence of any feature(s) in its available optical spectra. This study forms a part of our ongoing campaign of intranight optical monitoring of radio-quiet WLQs, in order to improve the understanding of this enigmatic class of active galactic nuclei and to look among them for a possible tiny, elusive population of radio-quiet BL Lacs.

  5. Blood Glukose Response of Giant Gouramy (Osphronemus gaouramy, Lac. to the Stress of Environmental Temperature Changes

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    S. Hastuti

    2007-08-01

    Full Text Available This experiment was conducted to investigate blood glucose performance of giant gouramy (Osphronemus gouramy, Lac. to environmental changes. Fish with body weight of about 52,15 g was used in the experiment. A hundred and twenty fish were subjected to stress by moving them to another aquarium containing cooler water for 5 minute before put them back to the origin aquarium. The stress treatments were Δ 0°C (A, Δ-3°C (B, Δ-6°C(C, and Δ-9°C(D. Blood glucose was measured at 0, 1, 2, 3, 4 and 5 hours post stress, each for 5 fish. During stress treatment, the survival offish were recorded. To study the role of insulin activation on reducing the stress effects, thirty fish were injected with insulin 2 IU/100 g body weight before subjected them to stressar. Blood glucose level of fish subjected to temperature stress of Δ-9°C was the greatest. The blood glucose response to temperature changes was linear, Y = 4,4543 X + 35,553 with R2 = 0,09976. The survival rate of fish was 100% for all treatments. Injected of insulin 2 IU/100 g body weight was able to reduce hyperglycemia that caused by stress. Key words: Blood glucose, giant gouramy, Osphronemus gouramy, stress   ABSTRAK Penelitian ini dilakukan dengan tujuan untuk mengetahui performa glukosa darah ikan gurami (Osphronemus gouramy, Lac. dalam merespon perubahan suhu lingkungan. Ikan berbobot rata-rata 52,15 g sebanyak 120 ekor diberi stres dengan cara diangkat dan dipindahkan ke suatu wadah yang bersuhu lebih dingin selama 5 menit dan dikembalikan lagi ke wadah mula-mula. Perlakuan stres perubahan suhu dingin tersebut adalah A (Δ 0°C, B (Δ- 3°C, C (Δ-6°C dan D (Δ-9°C. Glukosa darah diukur dari 5 ekor ikan pada jam ke 0, 1, 2, 3, 4 dan 5 jam pascastres. Kelangsungan hidup dihitung pada saat perlakuan stres. Untuk melihat peran aktivasi insulin dalam menekan efek stres, ikan sebanyak 30 ekor diinjeksi insulin 2 iu/100 g bobot badan sebelum diberi stres. Kadar glukosa darah ikan gurame

  6. Paul Celan in Translation: "Du sei wie du"

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    John Felstiner

    1983-09-01

    Full Text Available Translating the lyric poetry of Paul Celan, especially his later poems, carries not only the endemic challenge and difficulty of any verse translation, but the added incentive of doing justice to a writer whose whole recourse after the Holocaust—whose sanctuary, if he was to have any at all—he sought in language itself, specifically in the Muttersprache , the mother tongue that was as well the tongue of those who murdered his mother and father. This essay exposes a process of translating "Du sei wie du" (1970, which perhaps more than any other poem by Celan, at once solicits and defies translation, moving as it does from modern to medieval German, and closing with Hebrew words from Isaiah— a messianic imperative that shows Celan verging as ever on his Jewish identity.

  7. Le parcours migratoire de jeunes ruraux du bled du kif

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    Khalid Mouna

    2015-06-01

    Full Text Available Cet article analyse le parcours migratoire des jeunes ruraux originaires des zones de production du cannabis, jeunes qui cherchent à briser les chaînes de soumission et d’humiliation vécues au quotidien. Pour les jeunes concernés par notre étude, la migration constitue un moyen de s’intégrer dans des réseaux transnationaux et ainsi d’entamer une carrière de beznass (commerçant du cannabis. Ce parcours « initiatique » permet à ces jeunes de revenir au bled avec de nouvelles idées, des moyens accrus, et de jouer un rôle actif dans l’économie locale – qui reste pour eux focalisée sur la production de cannabis, cette dernière restant néanmoins officiellement interdite.

  8. Marche du foncier urbain et promotion du logement au Benin ...

    African Journals Online (AJOL)

    Le marché du foncier urbain au Bénin est un secteur qui met en jeu l'intervention de plusieurs acteurs publics et privés mais également de l'informel. La notion de « foncier urbain » utilisée dans cet article englobe les acceptions et les utilisations faites en architecture, en urbanisme, en aménagement et en gestion urbaine.

  9. Gestion du parc agroforestier du terroir de Vipalogo (Burkina Faso ...

    African Journals Online (AJOL)

    Au Burkina Faso, l'arbre rural fait partie des systèmes de production. Le choix des espèces, leur densité, les modes de gestion ainsi que les besoins à satisfaire, obéissent à des critères propres aux producteurs. C'est pour comprendre ces logiques paysannes de la gestion du parc agroforestier que la présente étude a été ...

  10. Malformations du tube neural en chirurgie pediatrique du chu de ...

    African Journals Online (AJOL)

    encéphalocèle et 6 cas de sipina bifida. La cure chirurgicale a été le principal mode de prise en charge des patients. Seuls 91,38% des cas ont été opérés. Pour toutes les malformations du tube neural, nous avons enregistré 7 décès dont 2 décès ...

  11. REGULATION D'UNE PRODUCTION EN SITUATION D'INCERTITUDES ET DE FORTES CONTRAINTES : EXEMPLE DES SYSTEMES RIZICOLES DU LAC ALAOTRA (MADAGASCAR)

    OpenAIRE

    Ducrot , Raphaele

    1996-01-01

    With state disengagement from land irrigation management, producers have to manage their production systems in an atmosphere of increasing risk and uncertainty. To achieve this, they implement adaptation processes and technical strategies for regulating production We have studied such behavior in the rice-production systems of Lake Alaotra in Madagascar. Strategies mainly rely on the organisation of land and on crop system management. A dual methodological approach was used to understand thes...

  12. Pérennité du lac Naivasha : amélioration de l'écosystème en vue d ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    une activité économique de plus en plus soutenue; la floriculture y est notamment intensément pratiquée. La floriculture est une industrie qui procure des avantages économiques, mais qui accroît également la demande de services ...

  13. La pêcherie du lac Ihema (Rwanda : production commerciale et rentabilité socio-économique (1981-1987

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    Mughanda, M.

    1991-01-01

    Full Text Available Lake Ihema fishery (Rwanda. Commercial production and socio-economical profitability (1981-1987. Among the small lakes in the flooded area of the river Akagera, in eastern Rwanda, lake Ihema (area : 90 km2, mean depth : 4 m is the most important. The density of phytoplankton in the water is high but dissolved salts concentration is low. Ichtyofauna of the lake consists of 34 species which were occasionally exploited by tanzanian fishermen. That is why, since 1980, the government of Rwanda with the aid of the Belgian Cooperation Agency for Development have initiated an official fishery. Total yield, fishing effort and financial investments are analysed over a 7 years period (1981 to 1987 in order to precise the socio-economical efficiency of this cooperation project. Total fishery effort and total yield have increased regularly until 1983, reaching 186 tons with a fishing effort of 9.231 outings. Since that year, the production has stabilized at a level of 156-199 t/year with only two taxa exploited : Tilapia spp and Clarias gariepinus. The analysis of book-keeping and annual accountant balance of the Ihema fishery shows that the annual exploitation ratio fluctuates between 81 and 142, 5 % ; this indicates a difficult control of the expenditures at least during some years (1984, 1985 and 1986. The profit ratio shows a positive return (± 10 % since 1981 to 1983, then a depression during 1984 and a continual increase during the next years to become positive again in 1987. Continuous evaluations of these simple parameters allowed to take some actions in order to maintain the efficiency of the fishery. This new activity will be maintained if there is a good fish stock management and rigorous accounts.

  14. Analyse dendroecologique et dendroclimatique des gisements de bois de lacs de la taiga de l'est de l'Amerique du Nord

    Science.gov (United States)

    Gennaretti, Fabio

    The aim of this thesis was to reconstruct ecological processes and climate change in the taiga of Quebec over the last two millennia to understand factors that have strongly influenced the evolution of this majestic region. To obtain the finest spatial and temporal resolution in our analysis, we used annual growth rings of subfossil logs collected in six lakes as paleoecological and paleoclimatic proxies. Deposits of subfossil logs determine the structure of lake littoral ecosystems and support their food webs. Moreover, they may represent long-term carbon sinks. In the first chapter of the thesis, we described present-day stocks of subfossil logs in the selected littoral zones and established log residence time in the lakes by tree-ring or radio carbon dating. Dating also allowed precise identification of each fire that burned the riparian forests during the last millennium. This chapter showed that interactions between terrestrial and aquatic ecosystems in the taiga are strongly influenced by wildfires whose effects can persist for centuries because of strong postfire reductions of log recruitments in lakes. At a local scale, the amount of logs and carbon preserved in littoral stocks depends on the fire history of the last millennium that is specific to each site. At a regional scale, wildfires limit significantly the amount of carbon sequestered in littoral stocks of logs. These stocks represent a negligible fraction of the total taiga carbon storage despite the abundance of lakes and the long residence time of littoral logs (up to five millennia for buried logs). In the second chapter, we combined a detailed inventory of the present-day riparian forest situated along the shoreline of two lakes with the tree-ring dating of the subfossil logs accumulated in the littoral zones facing these shores. Our objective was to determine whether changes in current riparian forest structure and composition within a given site could be attributed to different fire histories over the last millennium and to show the impacts of past fires on tree mortality, density and growth. Using our impressive paleoecological dataset (n = 1037 logs) in combination with our present-day forest inventory, we were able to reconstruct millennial forest dynamics with an unprecedented high spatial (few hundreds of square meters) and temporal (annual) resolution. Our findings help explain how the present-day landscape diversity in the taiga reflects the fire history of the last millennium, which varies from site to site. Fires have caused persistent and cumulative impacts resulting in a progressive opening of the forest coyer along with exclusion of balsam fir, a fire-sensitive tree species. The taiga landscape is a mosaic of forest stands characterized by different times since fire and different postfire forest structure trajectories. In the third chapter, we used our network of millennial tree-ring chronologies developed from the collected subfossil logs to pro duce a regional reconstruction of July-August temperatures over the last 1100 years. Our network filled a wide gap in the north-hemispheric network of paleoclimate proxies with annual resolution used for temperature reconstructions of the last millennium (see IPCC report). Moreover, our reconstruction provided direct field evidence that the climate of Northeastern North America is particularly sensitive to volcanic forcing. Indeed, successive large eruptions triggered the beginning of cold episodes in the study area that persisted for decades. In particular, two series of eruptions, centered around the Samalas event in 1257 and the Tambora event in 1815, coincided with two abrupt temperature regime shifts. In Northeastern North America, these shifts marked the onset of the Little Ice Age and the beginning of its coldest phase, respectively. Our reconstruction also showed a well-expressed Medieval Climate Anomaly, which included a few decades significantly warmer than the last 10 years. Keywords : fire ecology; forest-lake interactions; large woody debris; Little Ice Age; Medieval Climate Anomaly; millennial tree-ring chronologies; plant-climate interactions; temperature regime shifts; trajectories of forest structure and composition; volcanic forcing.

  15. ADAPTATION AUX CHANGEMENTS CLIMATIQUES PAR UNE AQUACULTURE RURALE : POTENTIEL ET CAPACITE DE CHARGE DU LAC DE BARRAGE HASSAN 1er (MAROC.

    Directory of Open Access Journals (Sweden)

    Mustapha HASNAOUI

    2017-05-01

    Full Text Available The aim of this study was to estimate the carrying capacity of Hassan 1er Dam Lake, Morocco, where cage farms for the intensive culture of Tilapia Nilotica will be located. For this purpose Dillon and Rigler phosphorus budget model was applied in a series of steps. Results related with the carrying capacity of this reservoir make it possible to determine production levels that will not damage water quality or create a risk of eutrophication. The carrying capacity, taking as a basis the total area of the lake (6.7 ha and the acceptable (maximum total phosphorus concentration of 65 mg m-3, was estimated at 191 tons.y-1 that could be produced through intensive cage aquaculture. This estimated value was about 4 times higher than the present production level of the lake. This study has shown that it possible to carry out intensive fish culture in floating cages in others dam lakes in arid and semi-arid zones by using the phosphorus budget model recommended in this study.

  16. Bistable behavior of the lac operon in E. coli when induced with a mixture of lactose and TMG

    Directory of Open Access Journals (Sweden)

    Orlando Díaz-Hernández

    2010-07-01

    Full Text Available In this work we investigate multistability in the lac operon of Escherichia coli when it is induced by a mixture of lactose and the non-metabolizable thiomethyl galactoside (TMG. In accordance with previously published experimental results and computer simulations, our simulations predict that: (1 when the system is induced by TMG, the system shows a discernible bistable behavior while, (2 when the system is induced by lactose, bistability does not disappear but excessively high concentrations of lactose would be required to observe it. Finally, our simulation results predict that when a mixture of lactose and TMG is used, the bistability region in the extracellular glucose concentration vs. extracellular lactose concentration parameter space changes in such a way that the model predictions regarding bistability could be tested experimentally. These experiments could help to solve a recent controversy regarding the existence of bistability in the lac operon under natural conditions.

  17. Bistable behavior of the lac operon in E. coli when induced with a mixture of lactose and TMG.

    Science.gov (United States)

    Díaz-Hernández, Orlando; Santillán, Moisés

    2010-01-01

    In this work we investigate multistability in the lac operon of Escherichia coli when it is induced by a mixture of lactose and the non-metabolizable thiomethyl galactoside (TMG). In accordance with previously published experimental results and computer simulations, our simulations predict that: (1) when the system is induced by TMG, the system shows a discernible bistable behavior while, (2) when the system is induced by lactose, bistability does not disappear but excessively high concentrations of lactose would be required to observe it. Finally, our simulation results predict that when a mixture of lactose and TMG is used, the bistability region in the extracellular glucose concentration vs. extracellular lactose concentration parameter space changes in such a way that the model predictions regarding bistability could be tested experimentally. These experiments could help to solve a recent controversy regarding the existence of bistability in the lac operon under natural conditions.

  18. Du Gondwana à l'atlantique sud: les connexions du fossé de la bénoué avec les bassins du Nord-Est brésilien jusqu'à l'ouverture du golfe de Guinée au crétacé inférieur

    Science.gov (United States)

    Popoff, Michel

    The Benue trough and the intracontinental basins of Northeast Brazil are located in the African-South American mobile belt deformed during the Pan-African (or Brazilian) orogeny. The chain trends in a N-S to NNE-SSW direction. During the Late Precambrian collision stages in between the cratons of West Africa, Sao Francisco and Congo, dominant NE-SW ductile shear zones acted as limits of mobile crustal blocks on both sides of the Gulf of Guinea. This gondwanian assemblage was reworked during the installation of the West and Central African rift system under the effects of a generalized distension which led to the opening of the Equatorial domain of the South Atlantic. Phanerozoic basins became oriented according to the inherited gondwanian mega-discontinuities along which brittle tectonics was most prominent. After an initial pre-rift deformation from Late Jurassic to Eo-Cretaceous, three principal tectono-sedimentary phases in the Benue Trough and the Northeast Brazilian basins have been shown— an eo-rift phase (Neocomian to Early Barremian) of extensional brittle tectonics and basin initiation— a syn-rift I phase (Barremian to Middle Albian) of crustal stretching, local block tilting and basin installation; associated synchronous basaltic magmatism with transitional affinities is characteristic of intracontinental distensive zones. This is the period of the Medio-African and NE-Brazilian Cretaceous Great Lakes; a syn-rift II phase (Late Albian-Early Cenomanian) of a probable crustal surextension related to regional tilting. The above evolutionary stages apply to the Equatorial domain of the South Atlantic (NE Brazil, Cameroon, Nigeria up to the Ivory Coast) deformed during the Late Jurassic to Early Cretaceous. This domain represented the final gondwanian link between the Central and South Atlantic. The new evidences of well dated polyphased intra-plate deformations are contrary to the earlier views of rigid plates in the context of continental reconstructions to obtain the pre-drift fit, different from the pre-rift one. Reconsidering the scenario of the South Atlantic opening through the geological record of its continental margins, it can be noted that the axial rift propagates from the South towards the North within successive domains (Austral, Tropical and Equatorial). The continental rifting-drifting processes were thus reproduced in the adjoining domain every 20 Ma. At the limit, transfer fault zones oriented NE-SW (with Africa in its present position) accomodate a differential deformation between each domain. In the Benue Trough, a strike-slip sinistral movement with a displacement of several tens of kilometres has been estimated along a similar NE-SW direction. The trough represents the abandoned arm of a RRF triple junction which acted at the time of the refraction of the Southern South Atlantic opening into the E-W domain of the Gulf of Guinea. The present features of the African and South American continents appeared as from the uppermost Albian to Lower Cenomanian times of final crustal disruption followed by a progressive separation of the land masses along the strike-slip equatorial margins.

  19. Karakteristik Enzim Digesti, Protease dan Amilase, Ikan Gurami (Osphronemus gouramy Lac. pada Fase Pertumbuhan

    Directory of Open Access Journals (Sweden)

    Untung Susilo

    2015-05-01

    Full Text Available Suatu penelitian untuk mengetahui karakteristik enzim digesti, protease dan amilase pada ikan gurami, Osphronemus gouramy Lac., telah dilakukan dengan metode survey. Jumlah ikan yang digunakan untuk penelitian sebanyak 25 ekor yang dikelompokan menjadi tiga kelompok ukuran13,29, 35,86 dan 91,86 g/ekor. Hasil penelitian menunjukkan bahwa aktivitas protease digesti ikan gurami berbeda secara signifikan pada segmen usus dan pH buffer yang berbeda (P.05, namun berbeda secara signifikan diantara ukuran ikan yang berbeda (P<.05, dan aktivitas amilase tertinggi dijumpai pada ikan dengan ukuran terkecil. Kesimpulan yang dapat diambil adalah bahwa aktivitas protease dan amilase dijumpai sepanjang saluran digestinya baik pada ikan yang berukuran kecil maupun besar. Aktivitas protease umumnya tinggi pada suasana asam dan netral pada usus depan dan tengah. Aktivitas protease ikan yang berukuran besar lebih rendah dari pada ikan yang berukuran lebih kecil. Aktivitas amilase tidak terdapat perbedaan diantara segmen usus yang diuji, namun aktivitas amilase tertinggi dijumpai pada ikan dengan berat rata-rata 13,29 g/ekor

  20. Burn care in Los Angeles, California: LAC+USC experience 1994-2004.

    Science.gov (United States)

    Garner, Warren L; Reiss, Matthew

    2005-01-01

    The LAC+USC Burn Center has admitted 3118 patients for treatment in the last 10 years. A majority of patients were young adults (1868), with the second largest group being small children (543). The ethnicity of the patients reflects the diverse nature of the population of Los Angeles County. Forty-eight percent of injuries were less than 5% TBSA and approximately 2% were greater than 60% TBSA. Eighty-two percent were accidental injuries. Sixty percent of admitted patients underwent skin grafting. Mortality was negligible in the group with burns over less than 10% of their body and very high (15/19), 79% in the most severely burned group. Further, there was a high correlation between age and mortality. Complications during treatment included: deep venous thrombosis 1% per year; pulmonary emboli in 5 patients; endotracheal tube dislodgment early or self-extubation about 1 month (11.3 per year); 4.5 patients per year who developed acute renal failure; abdominal compartment syndrome developed in 4.7 patients each year; heterotopic ossification was seen in 4 patients (0.4%); 4 patients (0.4%) developed stage II-IV pressure sores; hypothermia was present in 0.8% of patients.

  1. Variable quasi-stellar sources with particular emphasis on objects of the BL Lac type

    International Nuclear Information System (INIS)

    Kinman, T.D.

    1975-01-01

    The optically variable quasars tend to have steep optical spectra and to show variable polarization; they tend to be associated with compact radio sources which have flat radio spectra at GHz frequencies. Objects are known which have continuous spectra (like BL Lac and OJ 287), but whose other properties closely parallel those of the variable quasars and N galaxies; in fact no sharp distinction can be drawn between them. The variation in the visibility of emission lines in quasars and N galaxies could be due to variations in the strength and spectral index of the radiation from the non-thermal source and from the differences in the amount and disposition of the material around it; it does not seem likely that a combination of these factors accounts for the observed range in emission line strength. The systematic difference in optical spectral index between continuous-spectrum objects (and OVV variables) on the one hand and those with emission lines on the other will produce a difference in K term between them, which may be expected to affect their distributions with respect to apparent magnitude. (Auth.)

  2. Surface radiant flux densities inferred from LAC and GAC AVHRR data

    Science.gov (United States)

    Berger, F.; Klaes, D.

    To infer surface radiant flux densities from current (NOAA-AVHRR, ERS-1/2 ATSR) and future meteorological (Envisat AATSR, MSG, METOP) satellite data, the complex, modular analysis scheme SESAT (Strahlungs- und Energieflüsse aus Satellitendaten) could be developed (Berger, 2001). This scheme allows the determination of cloud types, optical and microphysical cloud properties as well as surface and TOA radiant flux densities. After testing of SESAT in Central Europe and the Baltic Sea catchment (more than 400scenes U including a detailed validation with various surface measurements) it could be applied to a large number of NOAA-16 AVHRR overpasses covering the globe.For the analysis, two different spatial resolutions U local area coverage (LAC) andwere considered. Therefore, all inferred results, like global area coverage (GAC) U cloud cover, cloud properties and radiant properties, could be intercompared. Specific emphasis could be made to the surface radiant flux densities (all radiative balance compoments), where results for different regions, like Southern America, Southern Africa, Northern America, Europe, and Indonesia, will be presented. Applying SESAT, energy flux densities, like latent and sensible heat flux densities could also be determined additionally. A statistical analysis of all results including a detailed discussion for the two spatial resolutions will close this study.

  3. Europa-Latinoamérica: amigos complicados. Sobre la IV EU-LAC en Viena, Austria

    Directory of Open Access Journals (Sweden)

    Gerhard Drekonja-Kornat

    2014-06-01

    Full Text Available Para los presidentes latinoamericanos, las cumbres ya son rutina. Para Viena, la anfitriona de la IV reunión EU-LAC que se realizó del 11 al 13 de mayo de 2006, esta cumbre fue el acontecimiento del siglo. Se podría decir que fue la continuación del Congreso de Viena de 1815. Adecuadamente acicalada, se presentó la capital austriaca, a la cual después de Río, Madrid y Guadalajara, le tocó organizar la cuarta Cumbre de Jefes de Estado y de Gobierno de la Unión Europea, América Latina y el Caribe. Puesto que también se encontraban presentes los representantes de los países adherentes y candidatos a ingresar a la Unión –incluso el primer ministro de Turquía, R. T. Erdogan estuvo presente–, se tomó la tradicional “foto familiar” con 60 participantes.

  4. ANTI-CORRELATED OPTICAL FLUX AND POLARIZATION VARIABILITY IN BL LAC

    Energy Technology Data Exchange (ETDEWEB)

    Gaur, Haritma [Inter-University Centre for Astronomy and Astrophysics (IUCAA), Ganeshkhind, Pune 411 007 (India); Gupta, Alok C. [Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital 263 129 (India); Wiita, Paul J. [Department of Physics, The College of New Jersey, P.O. Box 7718, Ewing, NJ 08628-0718 (United States); Uemura, Makoto; Itoh, Ryosuke; Sasada, Mahito, E-mail: haritma@iucaa.ernet.in [Hiroshima Astrophysical Science Center, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526 (Japan)

    2014-01-20

    We present the results of photometric (V band) and polarimetric observations of the blazar BL Lac during 2008-2010 using TRISPEC attached to the KANATA 1.5 m telescope in Japan. The data reveal a great deal of variability ranging from days to months with detection of strong variations in fractional polarization. The V band flux strongly anticorrelates with the degree of polarization during the first of two observing seasons but not during the second. The direction of the electric vector, however, remained roughly constant during all of our observations. These results are consistent with a model with at least two emission regions being present, with the more variable component having a polarization direction nearly perpendicular to that of the relatively quiescent region so that a rising flux can produce a decline in degree of polarization. We also computed models involving helical jet structures and single transverse shocks in jets and show that they might also be able to agree with the anticorrelations between flux and fractional polarization.

  5. Genotype to phenotype mapping and the fitness landscape of the E. coli lac promoter.

    Directory of Open Access Journals (Sweden)

    Jakub Otwinowski

    Full Text Available Genotype-to-phenotype maps and the related fitness landscapes that include epistatic interactions are difficult to measure because of their high dimensional structure. Here we construct such a map using the recently collected corpora of high-throughput sequence data from the 75 base pairs long mutagenized E. coli lac promoter region, where each sequence is associated with its phenotype, the induced transcriptional activity measured by a fluorescent reporter. We find that the additive (non-epistatic contributions of individual mutations account for about two-thirds of the explainable phenotype variance, while pairwise epistasis explains about 7% of the variance for the full mutagenized sequence and about 15% for the subsequence associated with protein binding sites. Surprisingly, there is no evidence for third order epistatic contributions, and our inferred fitness landscape is essentially single peaked, with a small amount of antagonistic epistasis. There is a significant selective pressure on the wild type, which we deduce to be multi-objective optimal for gene expression in environments with different nutrient sources. We identify transcription factor (CRP and RNA polymerase binding sites in the promotor region and their interactions without difficult optimization steps. In particular, we observe evidence for previously unexplored genetic regulatory mechanisms, possibly kinetic in nature. We conclude with a cautionary note that inferred properties of fitness landscapes may be severely influenced by biases in the sequence data.

  6. L’Harmonie du monde

    Directory of Open Access Journals (Sweden)

    Martine Clouzot

    2003-11-01

    Full Text Available La Bourgogne est particulièrement bien présente et représentée dans l’exposition sur la musique et ses représentations au Moyen Âge organisée par Isabelle Marchesin (université de Poitiers, Christine Laloue (conservatrice du Patrimoine au Musée et Martine Clouzot (université de Bourgogne, au Musée de la Musique à Paris du 26 mars au 27 juin 2004. En Côte-d’Or, à Dijon, la Bibliothèque municipale a donné son accord officiel pour le prêt de la Bible d’Etienne Harding, les Moralia in Job et u...

  7. Les vicissitudes du fret ferroviaire

    OpenAIRE

    DABLANC, L

    2010-01-01

    Dans beaucoup de pays européens, et plus encore en Amérique du Nord et en Asie, le transport de marchandises par le train a augmenté depuis dix ans. Cette activité réduit la part des marchandises acheminées par la route et contribue ainsi au développement durable : un camion émet 8 à 30 fois plus de dioxyde de carbone que le train, pour une distance et une quantité transportée équivalentes. Pourtant, la France a raté ce renouveau. Filiale du groupe public SNCF, la Société Fret SNCF, qui assur...

  8. DNA adducts, mutant frequencies and mutation spectra in λlacZ transgenic mice treated with N-nitrosodimethylamine

    NARCIS (Netherlands)

    Souliotis, V.L.; Delft, J.H.M. van; Steenwinkel, M.-J.S.T.; Baan, R.A.; Kyrtopoulos, S.A.

    1998-01-01

    Groups of λlacZ transgenic mice were treated i.p. with N-nitrosodimethylamine (NDMA) as single doses of 5 mg/kg or 10 mg/kg or as 10 daily doses of 1 mg/kg and changes in DNA N7- or O6-methylguanine or the repair enzyme O6-alkylguanine-DNA alkyltransferase (AGT) were followed for up to 14 days in

  9. Probing BL Lac and Cluster Evolution via a Wide-angle, Deep X-ray Selected Sample

    Science.gov (United States)

    Perlman, E.; Jones, L.; White, N.; Angelini, L.; Giommi, P.; McHardy, I.; Wegner, G.

    1994-12-01

    The WARPS survey (Wide-Angle ROSAT Pointed Survey) has been constructed from the archive of all public ROSAT PSPC observations, and is a subset of the WGACAT catalog. WARPS will include a complete sample of >= 100 BL Lacs at F_x >= 10(-13) erg s(-1) cm(-2) . A second selection technique will identify ~ 100 clusters at 0.15 = 0.304 +/- 0.062 for XBLs but = 0.60 +/- 0.05 for RBLs. Models of the X-ray luminosity function (XLF) are also poorly constrained. WARPS will allow us to compute an accurate XLF, decreasing the error bars above by over a factor of two. We will also test for low-luminosity BL Lacs, whose non-thermal nuclear sources are dim compared to the host galaxy. Browne and Marcha (1993) claim the EMSS missed most of these objects and is incomplete. If their predictions are correct, 20-40% of the BL Lacs we find will fall in this category, enabling us to probe the evolution and internal workings of BL Lacs at lower luminosities than ever before. By removing likely QSOs before optical spectroscopy, WARPS requires only modest amounts of telescope time. It will extend measurement of the cluster XLF both to higher redshifts (z>0.5) and lower luminosities (LX<1x10(44) erg s(-1) ) than previous measurements, confirming or rejecting the 3sigma detection of negative evolution found in the EMSS, and constraining Cold Dark Matter cosmologies. Faint NELGs are a recently discovered major contributor to the X-ray background. They are a mixture of Sy2s, starbursts and galaxies of unknown type. Detailed classification and evolution of their XLF will be determined for the first time.

  10. Largemouth bass (Micropterus salmoides Lacépède): reproduction management and larval rearing in Italy

    OpenAIRE

    A. Dees; P. Melotti; R. Vicenzi; A. Roncarati

    2010-01-01

    Micropterus salmoides (Lacépède) was originally present into the waters of the eastern United States of America, northern Mexico and southern Canada. This species can be distinguished from the other black basses by the fact that its mouth extends to and beyond the edge of the eye and the first and the second dorsal fins are almost separated by a deep dip and there are no scales on the soft rayed of the second dorsal fin.

  11. Largemouth bass (Micropterus salmoides Lacépède: reproduction management and larval rearing in Italy

    Directory of Open Access Journals (Sweden)

    A. Dees

    2010-01-01

    Full Text Available Micropterus salmoides (Lacépède was originally present into the waters of the eastern United States of America, northern Mexico and southern Canada. This species can be distinguished from the other black basses by the fact that its mouth extends to and beyond the edge of the eye and the first and the second dorsal fins are almost separated by a deep dip and there are no scales on the soft rayed of the second dorsal fin.

  12. Optimization of lignin peroxidase, manganese peroxidase, and Lac production from Ganoderma lucidum under solid state fermentation of pineapple leaf

    OpenAIRE

    Sudha Hariharan; Padma Nambisan

    2013-01-01

    This study was undertaken to isolate ligninase-producing white-rot fungi for use in the extraction of fibre from pineapple leaf agriwaste. Fifteen fungal strains were isolated from dead tree trunks and leaf litter. Ligninolytic enzymes (lignin peroxidase (LiP), manganese peroxidase (MnP), and laccase (Lac)), were produced by solid-state fermentation (SSF) using pineapple leaves as the substrate. Of the isolated strains, the one showing maximum production of ligninolytic enzymes was identified...

  13. Quelques considérations sur l’histoire du bâtiment théâtral dans les villes danubiennes

    Directory of Open Access Journals (Sweden)

    Daniela Gheorghe

    2012-01-01

    Full Text Available Vers la fin du XVIe siècle et au début du XVIIe, commence en Europe la construction des bâtiments spécifiquement dédiés au théâtre. En Angleterre et en Espagne, les premiers édifices préservent la structure simple du lieu où on jouait avant : la cour d’auberge et le patio – modèles pour le théâtre élisabéthain et pour les corrales de comedias. En Italie, l’architecture théâtrale connut une autre évolution ; à la recherche du Beau idéal, on élève des élégants bâtiments clos, où la salle est richement ornée, où les décors créent l’illusion de perspective et où l’on utilise des machineries scéniques sophistiquées. Le modèle du théâtre « à l’italienne » allait être adopté, avec des variations, partout en Europe. Mais les coûts d’un tel édifice sont bien chers ; ils exigent un certain niveau de prospérité et de développement urbain. La tradition et le goût des habitants pour l’art du spectacle jouent, eux aussi, un rôle pas négligeable. Ce papier examine l’histoire du bâtiment théâtral dans les villes portuaires danubiennes, dans la perspective de l'influence qu'exerça le développement du commerce et des activités connexes sur la vie urbaine. Artère fluviale majeure de l’Europe, le Danube fut utilisé au long du temps par plusieurs réseaux marchands ; celles-ci ont contribué à l’essor des bourgs riverains et à l’ascension des couches moyennes. Ainsi se forme une bourgeoisie qui peut financer, d’une manière ou d’une autre, des théâtres municipaux et qui fournit un nombreux public payant. Il est vrai que cette évolution ne fut pas simultanée dans tout le bassin danubien ; des circonstances historiques diverses ont généré un décalage significatif, surtout entre la région occidentale et celle orientale du fleuve. Néanmoins, des similitudes existent, et le but de cet article est de les mettre en lumière.

  14. The extent of co-metabolism of glucose and galactose by L. lactis changes with the expression of the lacSZ operon from Streptococcus thermophilus

    DEFF Research Database (Denmark)

    Solem, Christian; Købmann, Brian Jensen; Jensen, Peter Ruhdal

    2008-01-01

    The lactose transporter and β-galactosidase from Streptococcus thermophilus, encoded by the lacSZ operon, were introduced into the lactose-negative strain Lactococcus lactis MG1363 and the expression of the lacSZ operon was modulated by substitution of the native promoter with randomized synthetic...... promoters. A series of strains with various expression levels of lacSZ were examined for their fermentation of lactose. Strains with a high expression level were found to metabolize lactose in a similar manner to S. thermophilus, i.e. the galactose moiety of lactose was excreted to the growth medium...... and only glucose was metabolized in glycolysis. Interestingly, strains with low expression of the operon showed a mixed acid metabolism and co-metabolism of galactose and glucose. The lactose flux increased gradually with increasing expression of the lacSZ operon until an optimum was observed...

  15. L'energie du moustique

    CERN Document Server

    Augereau, J F

    2002-01-01

    ENSEMBLE DE QUATRE ARTICLES - LARGE HADRON COLLIDER: Le dernier accelerateur de particules du CERN, le LEP, produisait des faisceaux d'electrons de 100 GeV chacun. Le LHC, qui accelere des faisceaux de protons, leur communiquera une energie de 7 TeV chacun. Une energie a la fois colossale et derisoire. Un TeV represente a peu pres l'energie cinetique d'un moustique (1/2 page).

  16. Revision des Symphurus du Siboga

    NARCIS (Netherlands)

    Chabanaud, Paul

    1955-01-01

    Ce m’est un devoir particulièrement agréable que de saisir l’occasion de ce petit mémoire pour remercier M. L. F. DE BEAUFORT, M. H. ENGEL, Directeur du Zoologisch Museum, ainsi que M. J. J. HOEDEMAN de l’accueil qu’à diverses reprises, j’ai reçu de leur part, au Zoölogisch Museum, et aussi des

  17. Actes des 5èmes Journées Scientifiques du GDR3544 Sciences du Bois. Journées Annuelles du GDR 3544 Sciences du Bois

    OpenAIRE

    CHAPLAIN, Myriam; CARE, Sabine; GRIL, Joseph

    2016-01-01

    Le Groupement de Recherche en Sciences du bois (GDR3544 Sciences du Bois) a été créé en 2012 par le CNRS et renouvelé en 2016 pour 5 ans. La mission de ce groupement est : (1) de structurer la recherche sur le bois en France pour lui donner une visibilité nationale, (2) de contribuer au développement de la formation en sciences du bois et (3) de servir de relai aux réseaux internationaux de sciences du bois. Les 5èmes journées annuelles du GDR Bois ont été organisées à Bordeaux, au domaine du...

  18. Quasi-simultaneous observations of BL Lac object Mrk 501 in X-ray, UV, visible, IR, and radio frequencies

    International Nuclear Information System (INIS)

    Kondo, Y.; Worrall, D.M.; Mushotzky, R.F.; Hackney, R.L.; Hackney, K.R.H.; Oke, J.B.; Yee, H.K.C.; Neugebauer, G.; Matthews, K.; Feldman, P.A.; Brown, R.L.

    1981-01-01

    Quasi-simultaneous observations of the BL Lac object Mrk 501 were performed for the first time at X-ray, ultraviolet, visible infrared, and radio frequencies. As the BL Lac objects are known to vary in their flux, such a ''quasi-instantaneous'' spectral energy profile is necessary in order to describe properly the energy generation mechanism. The observed spectral slope from the X-ray to UV regions is positive and continuous, but that from the mid-UV to visible light region becomes gradually flat and possibly turns down toward lower frequencies; the optical-radio emission cannot be accounted for by a single power law. Several theoretical models have been considered for the emission mechanism. In some cases quantitative comparison with the data is not practical. However, most of the models are, at least, not inconsistent with the observations. A quantitative comparison has been peformed with the synchroton self-Compton model; the total spectrum is found consistent with this model. The spectrum from visible light to X-ray is consistent with synchrotron radiation or with inverse-Compton scattering by a hot thermal cloud of electrons. The continuity of the spectral slope from X-ray to UV implied by the current data suggests that the previous estimates of the total luminosity of this BL Lac object has been underestimated by a factor of about 3 or 4

  19. Mutagenicity of ultraviolet A radiation in the lacI transgene in Big Blue mouse embryonic fibroblasts

    International Nuclear Information System (INIS)

    Kim, Sang-in; Pfeifer, Gerd P.; Besaratinia, Ahmad

    2007-01-01

    Sunlight ultraviolet A (UVA) irradiation has been implicated in the etiology of human skin cancer. A genotoxic mode of action for UVA radiation has been suggested that involves photosensitization reactions giving rise to promutagenic DNA lesions. We investigated the mutagenicity of UVA in the lacI transgene in Big Blue mouse embryonic fibroblasts. UVA irradiation of these cells at a physiologically relevant dose of 18 J/cm 2 caused a 2.8-fold increase in the lacI mutant frequency relative to control, i.e., 12.12 ± 1.84 versus 4.39 ± 1.99 x 10 -5 (mean ± S.D.). DNA sequencing analysis showed that of 100 UVA-induced mutant plaques and 54 spontaneously arisen control plaques, 97 and 51, respectively, contained a minimum of one mutation along the lacI transgene. The vast majority of both induced- and spontaneous mutations were single base substitutions, although less frequently, there were also single and multiple base deletions and insertions, and tandem base substitutions. Detailed mutation spectrometry analysis revealed that G:C → T:A transversions, the signature mutations of oxidative DNA damage, were significantly induced by UVA irradiation (P -5 ; P < 0.00001). These findings are in complete agreement with those previously observed in the cII transgene of the same model system, and reaffirm the notion that intracellular photosensitization reactions causing promutagenic oxidative DNA damage are involved in UVA genotoxicity

  20. Characterisation and discrimination of various types of lac resin using gas chromatography mass spectrometry techniques with quaternary ammonium reagents.

    Science.gov (United States)

    Sutherland, K; del Río, J C

    2014-04-18

    A variety of lac resin samples obtained from artists' suppliers, industrial manufacturers, and museum collections were analysed using gas chromatography mass spectrometry (GCMS) and reactive pyrolysis GCMS with quaternary ammonium reagents. These techniques allowed a detailed chemical characterisation of microgram-sized samples, based on the detection and identification of derivatives of the hydroxy aliphatic and cyclic (sesquiterpene) acids that compose the resin. Differences in composition could be related to the nature of the resin, e.g. wax-containing (unrefined), bleached, or aged samples. Furthermore, differences in the relative abundances of aliphatic hydroxyacids appear to be associated with the biological source of the resin. The diagnostic value of newly characterised lac components, including 8-hydroxyacids, is discussed here for the first time. Identification of derivatised components was aided by AMDIS deconvolution software, and discrimination of samples was enhanced by statistical evaluation of data using principal component analysis. The robustness of the analyses, together with the minimal sample size required, make these very powerful approaches for the characterisation of lac resin in museum objects. The value of such analyses for enhancing the understanding of museum collections is illustrated by two case studies of objects in the collection of the Philadelphia Museum of Art: a restorer's varnish on a painting by Luca Signorelli, and a pictorial inlay in an early nineteenth-century High Chest by George Dyer. Copyright © 2014 Elsevier B.V. All rights reserved.

  1. Study feature of variability extragalactic radio sources 3C 446 and BL Lac in the centimeter wavelength range

    International Nuclear Information System (INIS)

    Sukharev, A.L.

    2015-01-01

    This work presents the results of the analysis of long-term monitoring (over 40 years) changes in radio fluxes of the two extragalactic sources - 3C 446, and BL Lac. Observations at frequencies of 14.5, 8, 4.8 GHz were obtained in the Michigan Radio Astronomy Observatory (UMRAO). With using Fourier filtering were selected 0- C (short-period), and the trend component of flux variations that were analyzed separately with using the wavelet-analysis method. Each of these components is associated with certain physical processes in the 'core-accretion disk-jet' system. Were constructed time-frequency wavelet-spectra showing the changes of the frequency composition of the investigated data over time. For the trend component values of the main periods of -4-9 years (3C 446) and -8 years (BL Lac), for 0- C component -0.8-3 years (3C 446) and -0.6-4 years (BL Lac) and they appear in the temporal and structural changes of the jet. On the basis of calculating the global wavelet-spectra in the frequency range identified main phases activity of radio sources. Obtained comparison between the dynamics of jets (Mojave VLBI images), and change the frequency spectral structure of the studied data. With bandpass wavelet filtering, flux components corresponding to the main periods in the spectra, were identified and also found the delay between the observation frequencies in spectral bands of these periods

  2. Original Paper Performances comparées du HDL-cholestérol et du ...

    African Journals Online (AJOL)

    CT/HDL-C) et du HDL-Cholestérol est le meilleur prédicteur du SMet chez les adultes béninois. .... (Canada) et du. Ministère de la Santé du Bénin. Le consentement éclairé écrit a été obtenu de chaque participant avant leur recrutement dans.

  3. Thermal Evolution of Crude Oils in Sedimentary Basins: Experimental Simulation in a Confined System and Kinetic Modeling Evolution thermique des huiles dans les bassins sédimentaires : simulation expérimentale par pyrolyse en milieu confiné et modélisation cinétique

    Directory of Open Access Journals (Sweden)

    Behar F.

    2006-11-01

    coefficients alphaij were optimized with reference to a dataset comprising the final compositions resulting from oil pyrolysis experiments. This optimization was carried out successively on each distillate and each residue, on both distillate and residue from the same oil, then on the two distillates and two residues altogether. The model accounts satisfactorily for the specific kinetics of cracking of both each oil and of the two oils together, suggesting that it is now possible to predict the thermal behavior of a given oil provided the proportions of the ten fractions selected for the model are known. The wide temperature range in which the model is valid, supports its extrapolation to the temperature range of sedimentary basins. Une meilleure connaissance des mécanismes du craquage thermique des huiles doit permettre de mieux comprendre leur évolution naturelle dans les bassins sédimentaires et donc d'améliorer les modèles actuels utilisés pour prédire la formation du gaz. Bien que les mécanismes de craquage soient bien connus pour des composés modèles ou des mélanges simples d'hydrocarbures, il n'existe pas à l'heure actuelle, à l'exception des modèles empiriques, de méthode pour rendre compte de la dégradation thermique des mélanges complexes, surtout, lorsque ces derniers sont enrichis en produits lourds. Au cours du craquage thermique, une huile produira à la fois des composés plus légers et des composés plus lourds que la charge initiale. En conséquence, les produits de pyrolyse seront un mélange complexe contenant des produits nouveaux et des composés non encore dégradés. Afin de pouvoir faire la distinction entre réactifs et produits, nous avons choisi de fractionner chaque huile en deux grandes fractions : la première (distillat 300- contenant des hydrocarbures légers de C6 à C16 et la seconde (résidu 300+ contenant des hydrocarbures et des produits polaires. Afin de simuler l'évolution thermique des huiles, nous avons réalisé une

  4. Régionalisation du recrutement du personnel de santé au Burkina ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Régionalisation du recrutement du personnel de santé au Burkina Faso ... le ministère a adopté une politique de recrutement régionalisé de certaines catégories du ... de comprendre le contexte dans lequel une telle stratégie a été formulée, ...

  5. Complete genome sequence of hypervirulent and outbreak-associated Acinetobacter baumannii strain LAC-4: epidemiology, resistance genetic determinants and potential virulence factors

    Science.gov (United States)

    Ou, Hong-Yu; Kuang, Shan N.; He, Xinyi; Molgora, Brenda M.; Ewing, Peter J.; Deng, Zixin; Osby, Melanie; Chen, Wangxue; Xu, H. Howard

    2015-01-01

    Acinetobacter baumannii is an important human pathogen due to its multi-drug resistance. In this study, the genome of an ST10 outbreak A. baumannii isolate LAC-4 was completely sequenced to better understand its epidemiology, antibiotic resistance genetic determinants and potential virulence factors. Compared with 20 other complete genomes of A. baumannii, LAC-4 genome harbors at least 12 copies of five distinct insertion sequences. It contains 12 and 14 copies of two novel IS elements, ISAba25 and ISAba26, respectively. Additionally, three novel composite transposons were identified: Tn6250, Tn6251 and Tn6252, two of which contain resistance genes. The antibiotic resistance genetic determinants on the LAC-4 genome correlate well with observed antimicrobial susceptibility patterns. Moreover, twelve genomic islands (GI) were identified in LAC-4 genome. Among them, the 33.4-kb GI12 contains a large number of genes which constitute the K (capsule) locus. LAC-4 harbors several unique putative virulence factor loci. Furthermore, LAC-4 and all 19 other outbreak isolates were found to harbor a heme oxygenase gene (hemO)-containing gene cluster. The sequencing of the first complete genome of an ST10 A. baumannii clinical strain should accelerate our understanding of the epidemiology, mechanisms of resistance and virulence of A. baumannii. PMID:25728466

  6. Effect of the partial NaCl substitution by other chloride salts on the volatile profile during the ripening of dry-cured lacón

    Energy Technology Data Exchange (ETDEWEB)

    Dominguez, R.; Munekata, P.E.; Cittadini, A.; Lorenzo, J.M.

    2016-07-01

    The influence of three salting treatments (treatment II: 50% NaCl-50% KCl; III: 45% NaCl-25% KCl-20% CaCl2-10% MgCl2; IV: 30% NaCl-50% KCl-15% CaCl2-5% MgCl2) on the formation of volatile compounds throughout the process was studied and compared to those of a control “lacón” (treatment I: 100% NaCl). There was an intense formation of volatile compounds throughout the processing, particularly during the dry-ripening stage. The most abundant chemical family in all the formulations, in the final product was hydrocarbons followed by aldehydes. The total volatile compound release was more intense in the control “lacóns” (1164 AU×106 ·g–1dry matter) than in “lacóns” from formulations II, III and IV (817–891 AU×106 ·g−1dry matter). The “lacóns” from formulation I showed the highest amounts of aldehydes. The “lacóns” from formulations I and II presented the highest amounts of hydrocarbons. The main conclusion is that the replacement of NaCl produces changes in the volatile profile and could be affect the aroma of “lacón”. (Author)

  7. La disparition du temps en gravitation quantique

    OpenAIRE

    Saint-Ours, Alexis de

    2012-01-01

    Le but de ce travail est d’examiner l’incidence philosophique de la gravitation quantique sur le concept de temps. Je cherche à montrer qu’elle conduit à une disparition du temps comme dimension et ouvre la voie à une compréhension du temps comme variation et même à l’idée de variation pure. En l’absence de temps mécanique, il est cependant possible de définir un temps d’origine thermodynamique. Je montre en quoi cette dissociation du temps mécanique et du temps thermodynamique, fait écho à l...

  8. Geology and uranium occurrences in the Forez tertiary plain (in the French 'Massif Central'); Geologie et mineralisations uraniferes de la plaine tertiaire du Forez (Massif Central francais)

    Energy Technology Data Exchange (ETDEWEB)

    Duclos, P [Commissariat a l' Energie Atomique, Fontenay-aux-Roses - 92 (France). Centre d' Etudes Nucleaires

    1967-01-01

    In the first part, the observations made during the geological survey of the Forez Tertiary plain (in the French 'Massif Central') are recalled. Then, using various methods, the author lists the formations according to chronology. Finally, a reconstitution of the geological history of this subsidence basin is attempted. In the second part, the occurrence of 17 uranium bearing geochemical anomalies is commented upon. Each of these various anomalies is given a place on the stratigraphic scale. This enables the author to put the successive phases of uranium deposition into their proper perspective in the history of the plain. In conclusion, the author points out the usefulness of these uraniferous geochemical anomalies. (author) [French] Dans la premiere partie, l'auteur rappelle les observations faites au cours de l'etude geologique de la plaine tertiaire du Forez (Massif Central francais). Puis se servant de differentes methodes, il etablit une chronologie des formations. Enfin, il termine par un essai de reconstitution de l'histoire geologique de ce bassin de subsidence. Dans la deuxieme partie, il commente la decouverte de 17 anomalies geochimiques uraniferes. Il situe ces differentes anomalies dans la serie stratigraphique. Ceci lui permet de replacer les depots successifs de l'uranium dans l'histoire de la plaine. Enfin, il indique l'interet de ces anomalies geochimiques uraniferes. (auteur)

  9. L'algue alimentaire Spirulina sp. Découverte de lacs naturels à Wadi el Natroun en République Arabe d'Egypte Spirulina Sp. Food Alga. Discovery of Natural Lakes At Wadi El Natrun in the Arab Republic of Egypt

    Directory of Open Access Journals (Sweden)

    Abdin El Sherif S. A.

    2006-11-01

    Full Text Available Bien que connue depuis les temps les plus anciens, la dépression de Wadi el Natroun n'avait jamais été prospectée autrement que pour sa richesse en sels minéraux. C'est en 1977 que les auteurs, cherchant à savoir s'il existait des lacs naturels à Spirulines en République Arabe d'Égypte, découvrirent dans la dépression de Wadi el Natroun certains lacs comme Abou Gobara et El Khadra où croissaient spontanément les algues spirulines. Le climat du site, l'origine et la composition des eaux, ainsi que la concentration en algues, ont été étudiés afin d'estimer la productivité du site en vue d'une éventuelle exploitation industrielle. L'exploitation de ces lacs permettrait de mettre en valeur le site de Wadi el Natroun par la production d'une substance très riche en protéine pour l'alimentation humaine dont à tant besoin la République Arabe d'Égypte. Even though it has been known from olden days, the depression of Wadi el Natrun had never been prospected other than for its wealth of mineral salts. It was in 1977 that the authors began searching for natural lakes with Spirulina algae in the Arab Republic of Egypt and, in the depression of Wadi el Natrun, discovered varions lakes such as Abu Gobara and El Khadra where Spirulina algae grew in a natural state. The climate of the site, the original and composition of the water as well as the algae concentration were analyzed to evaluate the productivity of the site for eventual industrial exploitation. The exploitation of these lakes would give value to the Wadi el Natrun site by producing a very protein-rich substance for human nourishment which the Arab Republic of Egypt needs so badly.

  10. Mechanism of salt-induced activity enhancement of a marine-derived laccase, Lac15.

    Science.gov (United States)

    Li, Jie; Xie, Yanan; Wang, Rui; Fang, Zemin; Fang, Wei; Zhang, Xuecheng; Xiao, Yazhong

    2018-04-01

    Laccase (benzenediol: oxygen oxidoreductases, EC1.10.3.2) is a multi-copper oxidase capable of oxidizing a variety of phenolic and other aromatic organic compounds. The catalytic power of laccase makes it an attractive candidate for potential applications in many areas of industry including biodegradation of organic pollutants and synthesis of novel drugs. Most laccases are vulnerable to high salt and have limited applications. However, some laccases are not only tolerant to but also activated by certain concentrations of salt and thus have great application potential. The mechanisms of salt-induced activity enhancement of laccases are unclear as yet. In this study, we used dynamic light scattering, size exclusion chromatography, analytical ultracentrifugation, intrinsic fluorescence emission, circular dichroism, ultraviolet-visible light absorption, and an enzymatic assay to investigate the potential correlation between the structure and activity of the marine-derived laccase, Lac15, whose activity is promoted by low concentrations of NaCl. The results showed that low concentrations of NaCl exert little influence on the protein structure, which was partially folded in the absence of the salt; moreover, the partially folded rather than the fully folded state seemed to be favorable for enzyme activity, and this partially folded state was distinctive from the so-called 'molten globule' occasionally observed in active enzymes. More data indicated that salt might promote laccase activity through mechanisms involving perturbation of specific local sites rather than a change in global structure. Potential binding sites for chloride ions and their roles in enzyme activity promotion are proposed.

  11. Attachment to place in advanced age: A study of the LiLACS NZ cohort.

    Science.gov (United States)

    Wiles, Janine L; Rolleston, Anna; Pillai, Avinesh; Broad, Joanna; Teh, Ruth; Gott, Merryn; Kerse, Ngaire

    2017-07-01

    An extensive body of research theorises that attachment to place is positively associated with health, particularly for older people. Building on this, we measure how indicators of attachment to place are associated with health for in people of advanced age in New Zealand. We use data from a cohort study (LiLACS NZ), which includes an indigenous Māori cohort aged 80-90 years and a non-Māori cohort aged 85 years from a mixed urban/rural region in New Zealand. Each cohort undertook a comprehensive interview and health assessment (n = 267 Māori and n = 404 non-Māori). Using multivariate regression analyses, we explore participants' feelings for and connectedness with their home, community and neighbourhood; nature and the outdoors; expectations about and enthusiasm for residential mobility; and how all these are associated with measures of health (e.g., SF-12 physical and mental health related quality of life) and functional status (e.g., NEADL). We demonstrate that people in advanced age hold strong feelings of attachment to place. We also establish some positive associations between attachment to place and health in advanced age, and show how these differ for the indigenous and non-indigenous cohorts. For older Māori there were strong associations between various health measures and the importance of nature and the outdoors, and connectedness to neighbourhood and community. For older non-Māori, there were strong associations between health and liking home and neighbourhood, and feeling connected to their community and neighbourhood. Place attachment, and particularly its relationship to health, operates in different ways for different groups. Copyright © 2017 Elsevier Ltd. All rights reserved.

  12. End of life care preferences among people of advanced age: LiLACS NZ.

    Science.gov (United States)

    Gott, Merryn; Frey, Rosemary; Wiles, Janine; Rolleston, Anna; Teh, Ruth; Moeke-Maxwell, Tess; Kerse, Ngaire

    2017-12-19

    Understanding end of life preferences amongst the oldest old is crucial to informing appropriate palliative and end of life care internationally. However, little has been reported in the academic literature about the end of life preferences of people in advanced age, particularly the preferences of indigenous older people, including New Zealand Māori. Data on end of life preferences were gathered from 147 Māori (aged >80 years) and 291 non- Māori aged (>85 years), during three waves of Te Puawaitangi O Nga Tapuwae Kia Ora Tonu, Life and Living in Advanced Age (LiLACs NZ). An interviewer-led questionnaire using standardised tools and including Māori specific subsections was used. The top priority for both Māori and non-Māori participants at end of life was 'not being a burden to my family'. Interestingly, a home death was not a high priority for either group. End of life preferences differed by gender, however these differences were culturally contingent. More female Māori participants wanted spiritual practices at end of life than male Māori participants. More male non-Māori participants wanted to be resuscitated than female non- Māori participants. That a home death was not in the top three end of life priorities for our participants is not consistent with palliative care policy in most developed countries where place of death, and particularly home death, is a central concern. Conversely our participants' top concern - namely not being a burden - has received little research or policy attention. Our results also indicate a need to pay attention to diversity in end of life preferences amongst people of advanced age, as well as the socio-cultural context within which preferences are formulated.

  13. Identification of Cryptosporidium Species in Fish from Lake Geneva (Lac Léman) in France.

    Science.gov (United States)

    Certad, Gabriela; Dupouy-Camet, Jean; Gantois, Nausicaa; Hammouma-Ghelboun, Ourida; Pottier, Muriel; Guyot, Karine; Benamrouz, Sadia; Osman, Marwan; Delaire, Baptiste; Creusy, Colette; Viscogliosi, Eric; Dei-Cas, Eduardo; Aliouat-Denis, Cecile Marie; Follet, Jérôme

    2015-01-01

    Cryptosporidium, a protozoan parasite that can cause severe diarrhea in a wide range of vertebrates including humans, is increasingly recognized as a parasite of a diverse range of wildlife species. However, little data are available regarding the identification of Cryptosporidium species and genotypes in wild aquatic environments, and more particularly in edible freshwater fish. To evaluate the prevalence of Cryptosporidiumspp. in fish from Lake Geneva (Lac Léman) in France, 41 entire fish and 100 fillets (cuts of fish flesh) were collected from fishery suppliers around the lake. Nested PCR using degenerate primers followed by sequence analysis was used. Five fish species were identified as potential hosts of Cryptosporidium: Salvelinus alpinus, Esox lucius, Coregonus lavaretus, Perca fluviatilis, and Rutilus rutilus. The presence of Cryptosporidium spp. was found in 15 out of 41 fish (37%), distributed as follows: 13 (87%) C. parvum, 1 (7%) C. molnari, and 1 (7%) mixed infection (C. parvum and C. molnari). C. molnari was identified in the stomach, while C. parvum was found in the stomach and intestine. C. molnari was also detected in 1 out of 100 analyzed fillets. In order to identify Cryptosporidium subtypes, sequencing of the highly polymorphic 60-kDa glycoprotein (gp60) was performed. Among the C. parvum positive samples, three gp60 subtypes were identified: IIaA15G2R1, IIaA16G2R1, and IIaA17G2R1. Histological examination confirmed the presence of potential developmental stages of C. parvum within digestive epithelial cells. These observations suggest that C. parvum is infecting fish, rather than being passively carried. Since C. parvum is a zoonotic species, fish potentially contaminated by the same subtypes found in terrestrial mammals would be an additional source of infection for humans and animals, and may also contribute to the contamination of the environment with this parasite. Moreover, the risk of human transmission is strengthened by the

  14. Identification of Cryptosporidium Species in Fish from Lake Geneva (Lac Léman in France.

    Directory of Open Access Journals (Sweden)

    Gabriela Certad

    Full Text Available Cryptosporidium, a protozoan parasite that can cause severe diarrhea in a wide range of vertebrates including humans, is increasingly recognized as a parasite of a diverse range of wildlife species. However, little data are available regarding the identification of Cryptosporidium species and genotypes in wild aquatic environments, and more particularly in edible freshwater fish. To evaluate the prevalence of Cryptosporidiumspp. in fish from Lake Geneva (Lac Léman in France, 41 entire fish and 100 fillets (cuts of fish flesh were collected from fishery suppliers around the lake. Nested PCR using degenerate primers followed by sequence analysis was used. Five fish species were identified as potential hosts of Cryptosporidium: Salvelinus alpinus, Esox lucius, Coregonus lavaretus, Perca fluviatilis, and Rutilus rutilus. The presence of Cryptosporidium spp. was found in 15 out of 41 fish (37%, distributed as follows: 13 (87% C. parvum, 1 (7% C. molnari, and 1 (7% mixed infection (C. parvum and C. molnari. C. molnari was identified in the stomach, while C. parvum was found in the stomach and intestine. C. molnari was also detected in 1 out of 100 analyzed fillets. In order to identify Cryptosporidium subtypes, sequencing of the highly polymorphic 60-kDa glycoprotein (gp60 was performed. Among the C. parvum positive samples, three gp60 subtypes were identified: IIaA15G2R1, IIaA16G2R1, and IIaA17G2R1. Histological examination confirmed the presence of potential developmental stages of C. parvum within digestive epithelial cells. These observations suggest that C. parvum is infecting fish, rather than being passively carried. Since C. parvum is a zoonotic species, fish potentially contaminated by the same subtypes found in terrestrial mammals would be an additional source of infection for humans and animals, and may also contribute to the contamination of the environment with this parasite. Moreover, the risk of human transmission is strengthened by

  15. Contribution de la télédétection et des systèmes d'information géographique à la prise en compte du risque de prolifération des Aedes dans les zones humides de Bizerte (Nord de la Tunisie

    Directory of Open Access Journals (Sweden)

    Noura Brahmi

    2010-10-01

    Full Text Available Cette recherche a pour objectif d'aider les services d'hygiène en matière de cartographie numérique des biotopes potentiels à gîtes larvaires d'Aedes tout autour des zones humides de la région de Bizerte (Nord de la Tunisie. Ces zones humides subissent souvent des invasions inopinées de ces moustiques qui peuvent transmettre à l'homme des affections virales, microbiennes ou parasitaires (malaria, fièvre jaune, dengue…. Ces invasions posent des problèmes importants de nuisance qu'il importe d'analyser précisément si l'on veut se donner des chances de les enrayer. Pour lutter efficacement contre ces Aedes, il est nécessaire d'avoir une bonne connaissance de leur milieu et de leur écologie. C'est pourquoi, dans un premier temps, nous avons créé une base de données intégrée dans un système d'information géographique (SIG afin de définir, de localiser et d'analyser, par la superposition de plusieurs couches d'informations relatives au milieu naturel, les biotopes potentiels de prolifération des gîtes larvaires d'Aedes sur la carte d'aléa. Celle-ci constitue une source d'information nécessaire pour préciser le lien existant entre l'environnement et la nuisance, l'élément jugé vulnérable étant la population humaine. La carte du risque de nuisance est alors obtenue par croisement des cartes d'aléa et de vulnérabilité. La classe où le risque est fort concerne Menzel Bourguiba, Menzel Jmil, Menzel Abderrahmen, Tinja and Ghar el Melh. La classe correspondant à un risque moyen englobe toutes les villes et villages aux alentours du lac Ichkeul. La classe ne présentant pratiquement pas de risque couvre le bassin de l'oued Sejnene et la Garaât el Mabtouha.The major objective of this research is to provide concrete solutions numerical cartography of the potential biotopes to larval lodgings of Aedes all around the wetlands of the area of Bizerte (Northern of Tunisia. These zones are presented in the form of favourable

  16. Vie et mort des cités du Jawf

    Directory of Open Access Journals (Sweden)

    Jérémie Schiettecatte

    2006-02-01

    Full Text Available Cette communication est une approche archéogéographique des dynamiques de peuplement d’une large vallée du Yémen, le wâdî al‑Jawf. Par l’étude des sources épigraphiques et des données archéologiques, plusieurs sites archéologiques ont été renseignés au sein d’une base de données ; leur poids hiérarchique a été déterminé sur la base de considérations fonctionnelles et ils ont été analysés par le biais d’un système d’information géographique. Cartographier ces sites par période nous permet de mettre en évidence les dynamiques qui affectent le réseau urbain de cette région, prenant en considération le poids hiérarchique de chaque site, leur évolution au sein de l’armature urbaine et leur évolution à long terme.Au regard de ces cartes, d’anciennes considérations sur les causes du déclin de ces villes doivent être relativisées. Jusqu’à présent, des facteurs socio‑historiques étaient utilisés pour expliquer le déclin de ces villes sudarabiques. Mais si ces facteurs doivent être pris en considération, ce n’est que comme la cause directe ayant précipité ce déclin. La cause profonde semble liée à un recul du front de crue qui permettait la mise en culture des périmètres irrigués. En effet, la cartographie nous permet de montrer, dans une perspective dynamique, le déclin et la disparition des villes de l’aval vers l’amont. Ce retrait progressif se justifie d’une part par l’engorgement des systèmes hydrauliques de la vallée, mais également et surtout par le développement des systèmes de retenue d’eau et des terrasses agricoles sur les Hautes‑Terres, bassin versant de la vallée.This paper deals with an archaeological and geographical approach of the settlement process in a large valley of Yemen, the wâdî al‑Jawf. By studying epigraphic sources and archaeological data, several sites were informed within a database; their hierarchical status has been

  17. États de contraintes et mécanismes d'ouverture et de fermeture des bassins permiens du Maroc hercynien. L'exemple des bassins des Jebilet et des RéhamnaStates of stresses and opening/closing mechanisms of the Permian basins in Hercynian Morocco. The example of the Jebilet and Réhamna Basins

    Science.gov (United States)

    Saidi, Amal; Tahiri, Abdelfatah; Ait Brahim, Lahcen; Saidi, Maraim

    The fracturing analysis in the Permian basins of Jebilet and Rehamna (Hercynian Morocco) and the underlying terranes allowed us to suggest a model for their opening. Three tectonic episodes are distinguished: a transtensional episode NNE-SSW-trending (Permian I), occurring during the opening along sinistral wrench faults N70-110-trending, associated with synsedimentary normal faults; a transpressive episode ESE-WNW-trending (Permian II), initiating the closure, the normal faults playing back reverse faults and the N70 trending faults dextral wrench faults; a compressional episode NNW-SSE (post-Permian, ante-Triassic), accentuating the closure and the deformation and putting an end to the Tardi-Hercynian compressive movements. To cite this article: A. Saidi et al., C. R. Geoscience 334 (2002) 221-226.

  18. Le vide univers du tout et du rien

    CERN Document Server

    Diner, Simon

    1997-01-01

    Pourquoi l'Univers plutôt que le vide ? Le temps et l'espace existent-ils en l'absence de l'Univers ? Que reste-t-il quand tout est enlevé ? Pourquoi quelque chose plutôt que rien ? Depuis des siècles, ces interrogations mobilisent philosophes et physiciens. Mais aujourd'hui, le vide n'est pas le rien. Il serait même l'acteur central de l'histoire de la matière et de l'Univers, le partenaire privilégié de la physique. Vide et matière ne sont plus deux manifestations séparées de la nature, mais deux aspects d'une même réalité. Le vide est l'état de base dont la matière émerge, sans couper son cordon ombilical Le vide comme Univers du rien cède la place au vide comme Univers du tout. Que le vide puisse être conçu par les physiciens comme réservoir potentiel d'univers, voici qui ne devrait laisser personne indifférent. Ce livre ouvre un débat et nous convie à une réflexion surprenante.

  19. Image du savoir, image du pouvoir dans le Lapidaire

    Directory of Open Access Journals (Sweden)

    Marta LACOMBA

    2007-01-01

    Full Text Available À travers le prologue et les enluminures de présentation, le Lapidaire d’Alphonse X oriente l’interprétation de l’œuvre. Ces paratextes mettent en avant le rôle capital du savoir, représenté par la métaphore du trésor caché, qui a ici une valeur topique. Ils mettent également en exergue le rôle que s’attribue le roi dans la transmission de ce savoir, et placent cette nouvelle attribution royale au cœur de son projet politique.A través del prólogo y las miniaturas de presentación, el Lapidario de Alfonso X orienta la interpretación de la obra. Estos paratextos subrayan el papel capital del saber, representado por la metáfora del tesoro escondido, que tiene aquí un valor tópico. Ponen asimismo de manifiesto el papel que se atribuye el monarca en la transmisión de ese saber y colocan esta nueva atribución real en el centro de su proyecto político.

  20. Main: 1DU5 [RPSD[Archive

    Lifescience Database Archive (English)

    Full Text Available 1DU5 トウモロコシ Corn Zea mays L. Zeamatin Precursor. Name=Zlp; Zea Mays Molecule: Zeamatin; Chai...eta Sandwich SWS:ZEAM_MAIZE,P33679|EMBL; U06831; AAA92882.1; -.|PIR; T02075; T02075.|PDB; 1DU5; X-ray; A/B=22-227.|Mai

  1. les cahiers du cread: About this journal

    African Journals Online (AJOL)

    les cahiers du cread: About this journal. Journal Home > les cahiers du cread: About this journal. Log in or Register to get access to full text downloads. Username, Password, Remember me, or Register · Journal Home · ABOUT THIS JOURNAL · Advanced Search · Current Issue · Archives. People. » Contact. Policies.

  2. Les figures multiples du maire.

    Directory of Open Access Journals (Sweden)

    Olivier Lebraud

    2004-06-01

    Full Text Available Alors même que l’ensemble du personnel gouvernemental et parlementaire est sujet à une relative désaffection de la part des citoyens, les maires français jouissent, on le sait, d’une popularité qui fait d’eux les figures centrales de la scène politique. Au-delà de la décentralisation, qui a souvent renforcé leur image de décideurs, ils ont su tirer parti de la dimension identitaire qui caractérise l’échelon communal pour devenir les acteurs indispensables de la vie locale. ...

  3. Vers une anthropologie du Confucianisme

    OpenAIRE

    Rieu , Alain-Marc

    2010-01-01

    Research in Anthropology developed in France by Jean-Pierre Vernant, Marcel Détienne and Philippe Descola opens the possibility to reframe the debate and research on the function of Confucianism in Chinese culture, history and society. This paper shows how Confucianism can be studied as a "mythology"; La fonction du Confucianisme dans l'histoire de la société et de la culture chinoise, les débats et les reconstructions dont il est l'objet et l'enjeu, ouvre la possibilité de l'étudier d'un poi...

  4. Session du Conseil du CERN : le ministre britannique, Robert Jackson, souligne l'intérêt de on pays pour l'avenir du CERN : décisions du Conseil pour la mise en oeuvre des recommandations du Comité d'évaluation du CERN: départ anticipé pour 200 membres au moins du personnel - mise à jour de la méthode de calcule pour les contributions des Etats Membres au budget

    CERN Multimedia

    CERN Press Office. Geneva

    1988-01-01

    Session du Conseil du CERN : le ministre britannique, Robert Jackson, souligne l'intérêt de on pays pour l'avenir du CERN : décisions du Conseil pour la mise en oeuvre des recommandations du Comité d'évaluation du CERN: départ anticipé pour 200 membres au moins du personnel - mise à jour de la méthode de calcule pour les contributions des Etats Membres au budget

  5. La montagne, lieu de développement industriel : l’exemple du Languedoc-Roussillon

    Directory of Open Access Journals (Sweden)

    2007-03-01

    Full Text Available Michel WieninRiches en énergie (rivières, bois, puis houille, en matières premières minérales et en produits d’élevage, les régions de montagne ont développé tôt une industrie qui profite de l’essor des transports au XIXe siècle. Loin des grands bassins miniers, les vallées se transforment en une succession de bourgs industriels, accédant beaucoup plus vite à la modernité que les plaines restées agricoles ou que les villages d’altitude, à l’écart du progrès. Délimité par le Massif Central et les Pyrénées, le Languedoc-Roussillon présente une plaine évoluant vers une quasi-monoculture de la vigne et des vallées de montagne qui se tournent vers l’industrie textile et métallurgique.France’s mountain regions, which are rich in varied sources of energy (rivers, woods, then coal, in mineral resources and in products derived from livestock rearing, developed industries at an early date, benefiting from the development of new transport networks during the 19th century. Far from the major mining basins, the mountain valleys were transformed into a succession of industrial villages, reaching modernity more rapidly than the plains, still devoted to agriculture, or the villages high in the mountains and isolated from such progress. Bordered by the Massif Central and the Pyrenees, the region of Languedoc-Roussillon comprises a plain which evolved towards a mono-activity of wine production and the mountain valleys which witnessed the development of textile and metallurgical industries.

  6. Le Discours historique de l’estat du royaume de Borno, genèse et construction d’une histoire du Borno par un captif de Tripoli au XVIIe siècle The Discours historique de l’estat du royaume de Borno, genesis and construction of history of Borno by a seventeenth century’s captive in Tripoli

    Directory of Open Access Journals (Sweden)

    Rémi Dewière

    2013-05-01

    Full Text Available Le Discours historique de l’estat du royaume de Borno, écrit par un ancien captif de Tripoli en 1685, est l’une des sources les plus importantes de l’histoire de ce royaume sahélien situé sur la rive ouest du lac Tchad. Malheureusement, son analyse fut délaissée du fait d’incohérences, et l’intérêt de la source fut dévalué. Cependant, une étude du contexte de rédaction du manuscrit ainsi que de la construction du récit montre la grande richesse de ce texte. Tout en s’inscrivant dans un contexte favorable à la mise à l’écrit de l’expérience de captivité, celui que nous appellerons le « chirurgien français » effectue un réel travail de recherche tant à Tripoli qu’à son retour en France, où il rédige avec l’aide d’une tierce personne ce chapitre dans un ouvrage bien plus volumineux sur l’histoire de Tripoli. Le plus intéressant reste la façon dont le « chirurgien français » a recueilli ses sources : leur recensement permet un premier classement de celles-ci et une première analyse de l’apport du Discours historique de l’estat du royaume de Borno pour l’histoire moderne du sultanat de Borno.The Discours historique de l’estat du royaume de Borno, written by a former French slave in Tripoli in 1685, is one of the most important sources for the history of Borno sultanate. Unfortunately, its study has been neglected due to inconsistencies between the manuscript and other sources. The manuscript was then considered as a second hand source. However, a close study of the context where the manuscript was conceived and written shows that we can deeply learn from it. The work of whom we call the « French surgeon », comes within the scope of a context favorable for writing the experience of captivity. It is the consequence of the author’s intense works of research in Tripoli and in France. The « French surgeon » wrote this chapter in a voluminous manuscript on the history of Tripoli

  7. La tectonique panafricaine du secteur d’Igherm : implication des dômes extensifs tardi a post-orogeniques (Anti-Atlas Occidental, Maroc

    Directory of Open Access Journals (Sweden)

    Soulaimani, A.

    2005-12-01

    Full Text Available L’évolution tectonique tardi-orogénique panafricaine du secteur d’Igherm (Anti-Atlas occidental, Maroc se caractérise par l’exhumation des parties profondes paléoprotérozoïques à l’image des dômes extensifs. Elle est contrôlée par un détachement principal ductile de faible pendage et des détachements de fort pendage de type extensionnel qui succèdent à un raccourcissement régional de direction NW-SE. Le détachement principal subhorizontal, est souligné par des mylonites de faible degré métamorphique. Il sépare deux unités : l’unité inférieure (complexe métamorphique du Paléoprotérozoïque à comportement ductile et l’unité supérieure (Quartzites néoprotérozoïques du Supergroupe de l’Anti-Atlas à comportement fragile. Cette évolution coïncide avec la mise en place des bassins « supradétachement » du Supergroupe de Ouarzazate durant l’extension qui aurait débuté après le raccourcissement panafricain datés vers 650 Ma. L’évènement extensionnel peut être généralisé à tout l’Anti-Atlas occidental.La evolución tectónica tardi-orogénica panafricana del sector de Igherm (Anti-Atlas occidental, Marruecos se caracteriza por la exhumación de las partes profundas proterozoicas como domos extensivos. Está controlada por un despegue principal dúctil con poco buzamiento y despegues con alto buzamiento de tipo extensional que se sobreponen a un acortamiento regional de dirección NO-SE. El despegue principal subhorizontal viene marcado por milonitas con metamorfismo de grado bajo. Este accidente separa dos unidades : la unidad inferior (complejo metamórfico del Paleoproterozoico de comportamiento dúctil y la unidad superior (cuarcitas del neoproterozoico del Supergrupo del Anti-Atlas de comportamiento frágil. Esta evolución coincide con el origen de las cuencas de «supra-detachment» del Supergrupo de Ouarzazate durante la extensión que se habría producido después del acortamiento

  8. Bases en technique du vide

    CERN Document Server

    Rommel, Guy

    2017-01-01

    Cette seconde édition, 20 ans après la première, devrait continuer à aider les techniciens pour la réalisation de leur système de vide. La technologie du vide est utilisée, à présent, dans de nombreux domaines très différents les uns des autres et avec des matériels très fiables. Or, elle est souvent bien peu étudiée, de plus, c'est une discipline où le savoir-faire prend tout son sens. Malheureusement la transmission par des ingénieurs et techniciens expérimentés ne se fait plus ou trop rapidement. La technologie du vide fait appel à la physique, à la chimie, à la mécanique, à la métallurgie, au dessin industriel, à l'électronique, à la thermique, etc. Cette discipline demande donc de maîtriser des techniques de domaines très divers, et ce n'est pas chose facile. Chaque installation est en soi un cas particulier avec ses besoins, sa façon de traiter les matériaux et celle d'utiliser les matériels. Les systèmes de vide sont parfois copiés d'un laboratoire à un autre et le...

  9. Residues in the H+ Translocation Site Define the pKa for Sugar Binding to LacY†

    Science.gov (United States)

    Smirnova, Irina; Kasho, Vladimir; Sugihara, Junichi; Choe, Jun-Yong; Kaback, H. Ronald

    2009-01-01

    A remarkably high pKa of approximately 10.5 has been determined for sugar-binding affinity to the lactose permease of Escherichia coli (LacY), indicating that, under physiological conditions, substrate binds to fully protonated LacY. We have now systematically tested site-directed replacements for the residues involved in sugar binding, as well as H+ translocation and coupling, in order to determine which residues may be responsible for this alkaline pKa. Mutations in the sugar-binding site (Glu126, Trp151, Glu269) markedly decrease affinity for sugar but do not alter the pKa for binding. In contrast, replacements for residues involved in H+ translocation (Arg302, Tyr236, His322, Asp240, Glu325, Lys319) exhibit pKa values for sugar binding that are either shifted toward neutral pH or independent of pH. Values for the apparent dissociation constant for sugar binding (Kdapp) increase greatly for all mutants except neutral replacements for Glu325 or Lys319, which are characterized by remarkably high affinity sugar binding (i.e., low Kdapp) from pH 5.5 to pH 11. The pH dependence of the on- and off-rate constants for sugar binding measured directly by stopped-flow fluorometry implicates koff as a major factor for the affinity change at alkaline pH and confirms the effects of pH on Kdapp inferred from steady-state fluorometry. These results indicate that the high pKa for sugar binding by wild-type LacY cannot be ascribed to any single amino acid residue but appears to reside within a complex of residues involved in H+ translocation. There is structural evidence for water bound in this complex, and the water could be the site of protonation responsible for the pH dependence of sugar binding. PMID:19689129

  10. Various mutations compensate for a deleterious lacZα insert in the replication enhancer of M13 bacteriophage.

    Directory of Open Access Journals (Sweden)

    Emily M Zygiel

    Full Text Available M13 and other members of the Ff class of filamentous bacteriophages have been extensively employed in myriad applications. The Ph.D. series of phage-displayed peptide libraries were constructed from the M13-based vector M13KE. As a direct descendent of M13mp19, M13KE contains the lacZα insert in the intergenic region between genes IV and II, where it interrupts the replication enhancer of the (+ strand origin. Phage carrying this 816-nucleotide insert are viable, but propagate in E. coli at a reduced rate compared to wild-type M13 phage, presumably due to a replication defect caused by the insert. We have previously reported thirteen compensatory mutations in the 5'-untranslated region of gene II, which encodes the replication initiator protein gIIp. Here we report several additional mutations in M13KE that restore a wild-type propagation rate. Several clones from constrained-loop variable peptide libraries were found to have ejected the majority of lacZα gene in order to reconstruct the replication enhancer, albeit with a small scar. In addition, new point mutations in the gene II 5'-untranslated region or the gene IV coding sequence have been spontaneously observed or synthetically engineered. Through phage propagation assays, we demonstrate that all these genetic modifications compensate for the replication defect in M13KE and restore the wild-type propagation rate. We discuss the mechanisms by which the insertion and ejection of the lacZα gene, as well as the mutations in the regulatory region of gene II, influence the efficiency of replication initiation at the (+ strand origin. We also examine the presence and relevance of fast-propagating mutants in phage-displayed peptide libraries.

  11. Induction of lacI- mutations in Escherichia coli cells after single and split-dose irradiation

    International Nuclear Information System (INIS)

    Kozubek, S.; Ryznar, L.

    1992-01-01

    In the lacI system of Escherichia coli, X-ray mutagenesis follows a linear-quadratic curve with suppression; the survival curve is exponential. Dose fractionation leads to nearly complete repair of premutational lesions during an incubation interval of 3.5 h. Repair starts with a delay of 1.5-2 h, suggesting the involvement of an inducible repair/mutation fixation system. The dose-dependence of mutagenesis is described by a simple model assuming two hits being required. A probable explanation might be that the premutagenic lesions consist of two closely spaced lesions on the opposite strands of the DNA molecule. (author)

  12. Structural evidence for induced fit and a mechanism for sugar/H+ symport in LacY

    DEFF Research Database (Denmark)

    Mirza, Osman Asghar; Guan, Lan; Verner, Gill

    2006-01-01

    Cation-coupled active transport is an essential cellular process found ubiquitously in all living organisms. Here, we present two novel ligand-free X-ray structures of the lactose permease (LacY) of Escherichia coli determined at acidic and neutral pH, and propose a model for the mechanism...... of coupling between lactose and H+ translocation. No sugar-binding site is observed in the absence of ligand, and deprotonation of the key residue Glu269 is associated with ligand binding. Thus, substrate induces formation of the sugar-binding site, as well as the initial step in H+ transduction....

  13. Culture du bambou : diversification des moyens de subsistance des ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Culture du bambou : diversification des moyens de subsistance des petits producteurs de tabac du sud de la province de Nyanza, au Kenya - phase II. Au cours de la première phase du projet (projet no 103765), les chercheurs ont effectué une analyse de marché pour le bambou et les produits du bambou, comparé les ...

  14. Ports et commerce maritime dans l’Arabie du Sud préislamique Ports & Maritime Trade in Pre-Islamic Southern Arabia

    Directory of Open Access Journals (Sweden)

    Jérémie Schiettecatte

    2008-04-01

    Full Text Available L’Arabie du Sud, au début de l’ère chrétienne, connaît des changements significatifs. Parmi ceux-ci, le développement du commerce maritime au détriment de l’ancienne voie caravanière. Ce changement est souvent décrit comme brusque et débouchant sur une situation pérenne durant les siècles suivants.Nous avons choisi de reprendre ce dossier en réunissant, dans un premier temps, l’ensemble des données épigraphiques et historiques relatives aux ports préislamiques de la mer Rouge et du golfe d’Aden depuis leur fondation jusqu’au viie siècle. Ces synthèses nous permettent de décrire, dans un second temps, l’évolution de l’économie maritime au cours des premiers siècles de l’ère chrétienne, la nature des espaces d’échanges et le rôle du pouvoir politique dans le contrôle de cette nouvelle économie.Ceci nous amène à conclure que le commerce maritime ne se développe pas aussi brusquement qu’il n’y paraît : la mise en place des réseaux et des ports majeurs s’étale sur plusieurs siècles. Ce commerce ne fut le moteur économique des royaumes sudarabiques qu’au cours d’une période limitée, du milieu du ier siècle au début du iiie siècle. Les ports connurent ensuite une activité irrégulière, conditionnée par l’évolution politique et économique des royaumes sudarabiques, des pays voisins et du bassin méditerranéen.By the dawn of the Christian era, Southern Arabia is undergoing major changes; among these, the expansion of maritime trade at the expense of the old caravan route.  This change is often described as something sudden, leading to a more perennial situation the ensuing centuries.We have chosen to take a new look at this case by first gathering all the epigraphic and historic data having to do with pre-Islamic ports in the Red Sea and the Aden Gulf, from when they were first founded 'till the 7th century.  This global outline then has then allowed us to describe the

  15. COMMUNICATION DU CREDIT AGRICOLE - French version only

    CERN Multimedia

    2003-01-01

    La Direction du Crédit Agricole informe son aimable clientèle du CERN des jours et heures d'ouverture de l'agence du site de Prévessin à compter du mardi 14 janvier 2003 : 1. Horaires pour les opérations bancaires courantes 7 jours sur 7 et 24h/24 avec l'espace libre service bancaire. 2. Horaires conseil du mardi au vendredi - Mardi, de 9h. à 12h. et de 14h.15 à 16h.30. - Mercredi, jeudi et vendredi, de 9h. à 12h. et de 13h.30 à 16h.30. Deux collaboratrices au lieu d'une seront désormais présentes toute la journée du mardi au vendredi pour vous accueillir, vous informer et vous conseiller en crédits et placements (réception conseil sur rendez-vous). Autre nouveauté : les mêmes conseillers seront aussi à votre disposition le samedi, sur notre agence de Gex, de 8h.15 à 13h.05, notamment pour les études de financements habitat. La Direction et toute l'équipe de l'agence du Crédit Agricole vous souhaitent une excellent année 2003.

  16. Nouvelles du Centre Aéré de l’Association du Personnel du CERN

    CERN Multimedia

    Jardin d'enfants

    2015-01-01

    Cet été 2015, durant quatre semaines d’été, le Centre Aéré a accueilli plus de 40 enfants âgés de 4 à 6 ans. Devant le succès rencontré, et à la demande des parents, il a été décidé d’en doubler la capacité maximale. A l'été 2016, du 4 au 29 juillet, la structure pourra accueillir les enfants de 4 ans révolus et de moins de 7 ans (nés après le 31/07/2009 mais avant  01/07/2012). Les inscriptions se feront à la semaine durant le mois d'Avril 2016. Les programmes sont en cours d'élaboration cependant nous pouvons déjà vous communiquer le thème conducteur du centre qui sera : à la découverte d'un continent différent chaque ...

  17. Production of giant gourami Osphronemus goramy Lac. juvenile with different rate of water exchange

    Directory of Open Access Journals (Sweden)

    Tatag Budiardi

    2015-03-01

    Full Text Available ABSTRACTGiant gourami Osphronemus goramy Lac. is one of the most important fresh water fish commodities with increasing production level every year. Water quality management through a proper water exchange both in quantity and quality can be one of the alternatives to support the elevating production. This research was conducted from July to August 2010 at the Aquaculture Production Technology and Management Laboratory, Department of Aquaculture, Faculty of Fisheries and Marine Science, Bogor Agricultural University. The juvenile used was 0.84±0.011 cm in length and 0.017±0.001 cm in weight which reared in nine units of aquaria with a size of 60×29×33 cm3. Silk worm was used as the feed and provided daily at satiation. Water exchange was performed twice a day at a level depending on the treatment, namely 75% (50% at morning and 25% at evening, 100% (50% at morning and evening and 125% (75% at morning and 50% at evening of total water volume. Water exchange at 75%, 100%, and 125%/day resulted in survival rates of 94.11±0.63%; 91.89±2.02%; and 93.89±0.75%; specific growth rates of 7.43±0.15%, 8.58±0.24%, and 9.97±0.18%. Growth rate in length of 1.06±0.06 cm, 1.33±0.04 cm, and 1.55±0.01 cm; coefficient of variation in length of 11.31±1.43%, 9.35±1.46%, and 6.90±2.30%; feed efficiency of 12.47±0.30%, 14.32±1.05%, and 19.67±0.54%. The financial benefits resulted of the process were worth of IDR.351,903.00; IDR.402,302.00; and IDR.464,715.00; whereas R/C ratio of 1.71; 1.80; dan 1.90; BEP of 1,845 unit, 1,645 unit, and 1,517 unit; payback period (PP of 0.97 years, 0.85 years, and 0.74 years; and the cost production as much as IDR.79.90; IDR.82.70; and IDR.82.90/individual, respectively. The treatments were significantly different on several parameters, such as specific growth rate, length of growth rate, feed efficiency at p<0.05. The results of this experiment showed that 125% daily water exchange improved the production

  18. Coordonnateur du bureau d'assistance | CRDI - Centre de ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Résumé des fonctions. En tant que membre de l'équipe du Bureau d'assistance au sein de la Section du service à la clientèle (SSC), le coordonnateur du Bureau d'assistance offre au personnel du Centre et aux autres utilisateurs reconnus des installations TI du Centre un soutien de première ligne en matière d'utilisation ...

  19. La population du Moyen-Orient et de l'Afrique du Nord contribue ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    29 avr. 2016 ... Le degré d'apport au contenu varie grandement d'une population à l'autre. Si les habitants du Moyen-Orient et de l'Afrique du Nord (région MENA) utilisent Wikipédia, ils y contribuent cependant moins que les populations d'autres régions du monde. Le contenu au sujet de la région MENA est, le plus ...

  20. L'action du CRDI — le développement du secteur privé

    International Development Research Centre (IDRC) Digital Library (Canada)

    Cathy Egan

    Le CRDI est du nombre. Il reconnaît depuis longtemps la valeur de l'industrie, des échanges et du commerce comme moteurs de la croissance économique. Grâce au soutien concret qu'il a accordé au développement du secteur privé, le CRDI a appris que deux types d'aide peuvent porter fruit : améliorer le con- texte dans ...

  1. Citerne d'eau de pluie et effet sur le débit à l'exutoire du bassin versant de l'Orneau dans la région de Gembloux (Belgique

    Directory of Open Access Journals (Sweden)

    Xanthoulis, D.

    2011-01-01

    Full Text Available Rainwater storage and effect on flow rate at watershed outflow. This study participates to the quantitative balance of rain water domestic use. It aims towards an optimal design of rain barrels volume, the feasibility of soil infiltration techniques with excess of water and the impact assessment of rain barrel on the decrease of peak flow in a pilot rural watershed of 9 km², considering the chronology of precipitation events. The parameters that are considered are the roofs area, the number of inhabitants in the house, the average daily rainfall water consumption, and the local pluviometry. In order to design the infiltration structure associated with the rain barrel, the volume of rainfall excess from the rain barrel needs to be evaluated. Afterwards, the infiltration structure may be dimensioned according to the soil infiltration characteristics. We assume that 75 l, out of the 115 l daily consumed by each inhabitant, are coming from the rain barrel and the remainder (40 l is drawn from the drinking water distribution network. Calculations are carried out for roofs of 100, 135, 170 and 200 m², for a consumption of water ranging between 150 and 1,150 l per day per house and for rain barrels of 5, 10 and 20 m³. It appears that if correctly designed private rain barrel allows an opportune water use in households, the effect on flood reduction is, however, limited considering the relative low importance of the collecting surface (1.3% of the watershed surface.

  2. Sedimentology and geochemistry of carbonates diagenesis. Application to the Malm of the eastern edge of the Paris basin; Sedimentologie et geochimie de la diagenese des carbonates. Application au Malm de la Bordure Est du Bassin de Paris

    Energy Technology Data Exchange (ETDEWEB)

    Vincent, B

    2001-12-01

    The important heterogeneity of neritic carbonates reflects: 1 - the facies characteristics of the initial sediments, linked with the diversity of sedimentation environments, and 2 - the post-sedimentation diagenesis characteristics. The aim of this work is to explore this heterogeneity using the {delta}{sup 18}O isotopic signal. A three step pluri-disciplinary approach with different observation scales is established: 1 - a sedimentology study (facies inventory, paleo-environment variations, stratigraphic cycles), 2 - an inventory and chronology of the diagenesis phases and products which have modified he initial sediments, and 3 - a geochemical approach based on the {delta}{sup 18}O signal. This last step combines ionic microprobe measurements performed on separated phases and measurements performed on the whole rock carbonated phase. The carbonate formations under study correspond to the HTM102 borehole made by the ANDRA in the Malm of the eastern edge of the Paris basin. For the stratigraphic approach, some field analogues have been studied (Pagny-sur-Meuse and Gudmont-Villiers sections). (J.S.)

  3. Effets d'enrichissements azotés sur la croissance des palourdes mises en élevage dans les claires du bassin de Marennes-Oléron

    OpenAIRE

    Goulletquer, Philippe; Razet, Daniel; Prou, Jean; Garnier, Jacqueline; Taillade, Sylvie; Heral, Maurice; Peyre, R; Faivre, C

    1985-01-01

    Etant donné que la production de mollusques (palourdes ou huîtres) est limitée à 0,8 kg à 1 kg au m2 soit 40 à 50 palourdes adultes de 20 g au m2, il est intéressant d'essayer de forcer cette production en augmentant la production primaire qui est le facteur limitant de la production de palourdes. Cette production primaire dépend des apports en sels nutritifs en effet les travaux antérieurs de Zanette (1979), de Zanette et Garnier (1980), de Robert (1984) ont mis en évidence que les biomasses...

  4. Effets thermique et hydrothermal de la coulée de basalte triasico-liasique sur les argiles du bassin d'Argana (Maroc)Thermal and hydrothermal effects of Triassic Liassic basalt flow deposition on clays (Agana Basin, Morocco)

    Science.gov (United States)

    Daoudi, Lahcen; Pot de Vin, Jean-Luc

    Thermal and hydrothermal effects of Triassic-Liassic basalt flow deposition on sedimentary series of the Argana Basin are responsible for major modifications in detrital clays, until 20 m in depth. It expressed by transformation of detrital smectite to corrensite and moreover to chlorite, and by increasing illite crystallinity. On the 2 m of sediments located immediately under the flow, magnesium-rich hydrothermal fluids have caused precipitation of new mineral phases. To cite this article: L. Daoudi, J.-L. Pot de Vin, C. R. Geoscience 334 (2002) 463-468.

  5. Analyse sismo-stratigraphique du bassin d'Abda (Maroc occidental), exemple de structures inverses pendant le rifting atlantiqueSeismo-stratigraphic analysis of the Abda Basin (West Morocco): a case of reverse structures during the Atlantic rifting

    Science.gov (United States)

    Echarfaoui, Hassan; Hafid, Mohamed; Salem, Abdallah Aı̈t; Abderrahmane, Aı̈t Fora

    The review of the seismic reflection and well data from the coastal Abda Basin (western Morocco) shows that its Triassic and Jurassic sequences were deposited in a submeridean sag basin, whose eastern margin is characterised by progressive truncations and pinching out of these sequences against a prominent Palaeozoic high. The uplift of this latter is interpreted as a response to an Upper Triassic-Middle Jurassic local compressional event that controlled Triassic-Jurassic sedimentation within the Abda Basin. The present day 'West Meseta Flexure' is a surface expression of this uplift. To cite this article: H. Echarfaoui et al., C. R. Geoscience 334 (2002) 371-377.

  6. Reconnaissance de la structure géologique du bassin de saïss occidental, Maroc, par sondages électriquesPreliminary survey of the structure and hydrogeology of the western Saiss Basin, Morocco, using electrical resistivity

    Science.gov (United States)

    Essahlaoui, A.; Sahbi, H.; Bahi, L.; El-Yamine, N.

    2001-05-01

    A geophysical study, based on 96 electrical resistivity measurements with a line length up to 4 km, was performed in the southern and southwestern parts of the Meknes Plateau, Morocco, which is a part of the Saiss Basin, located between the Rif Range to the north and the Middle Atlas Range to the south. This basin, whose maximum depth is ˜ 1.5 km in the north, is filled with Triassic to Quaternary deposits overlying the Palæozoic basement and includes two main aquifers. The interpretation of the resistivity measurements, calibrated from deep boreholes, made it possible to obtain a new hydrogeological model for the Saiss Basin. The understanding of the basin structure is of primary importance for the water supply of this area, which has been affected by severe droughts in recent years.

  7. Contribution à l'étude d'une partie du bassin d'Essaouira (Maroc) par sismique réflexionContribution to part of the Essaouira Basin (Morocco) by seismic reflection

    Science.gov (United States)

    Jaffal, Mohammed; Kchikach, Azzouz; Lefort, Jean-Pierre; Hanich, Lahoucine

    A large number of seismic reflection lines and boreholes have been carried out in the Essaouira Basin by the oil industry. The present study concentrates on the reinterpretation of these data in the restricted area of Khemis Meskala, in order to better characterise the structure of the Cretaceous aquiferous system. The reflector corresponding to the bottom of the Vraconian formation has been identified on the different seismic sections. This horizon, which marks the base of the aquiferous system, was first digitised on time migration sections and then converted to depth sections using a suitable linear velocity law. The isobath map of the bottom of the Vraconian resulting from this study images the 3D geometrical structure of this horizon and shows that it is slightly folded in domes and basins. This document will be useful for rationalising the future hydrogeological researches that will be undertaken in the Khemis Meskala area. To cite this article: M. Jaffal et al., C. R. Geoscience 334 (2002) 229-234.

  8. Caractérisation et facteurs de contrôle des distributions minéralogiques du Bassin Piggyback de Graus-Tremp-Ainsa (Espagne), à l’Eocène Inférieur.

    OpenAIRE

    Chanvry , Emmanuelle

    2016-01-01

    We develop here a methodology to integrate the mineralogical record into a high resolution sequence stratigraphic framework realized in the Early Eocene Graus-Tremp-Ainsa Basin. Coupling stratigraphic with geochemical and mineralogical approaches allows us to unravel the effects of tectonics, climate, eustasy and diagenesis on basin architecture and mineralogy. An automated computed mineralogy is derived from whole-rock geochemical data, and calibrated against direct mineral quantifications (...

  9. Évaluation par analyse multicriteres de la vulnérabilité des sols a l'érosion : cas du bassin versant de l'Isser – Tlemcen – Algérie |Full article|

    Directory of Open Access Journals (Sweden)

    M. BOUGHALEM

    2013-10-01

    Full Text Available The drainage basin of Isser, space weakened by the periods of drought and characterized by exposures of marls and very fragile clays, prese nts a high sensitivity to erosion. In addition to the deterioration of the quality of water, the eros ion phenomenon in this zone presents risks of depletion of topsoil, loss of fertility, loosening of plants and pollution by pesticides dissolved in surface water runoff. The erosion results from the conjunction of many pe rmanent factors (as those related to the soil or to the topography, that are evolving o r presenting a random character (such as precipitations and intervene at different levels i n erosion processes. The purpose of the work is to produce a map of soil vulnerability to the erosion by integrating field data, different thematic maps and satellite images through GIS solution. This map sho uld be a basis for the development of the anti-eros ive land use plan adapted to the specific context of th e drainage basin of Isser. We do integrate four factors which determine the erosion: precipitations , topography, lithology, and vegetation cover. For combining these different factors, we use a cut ting space in regular meshes. The resulting map of the vulnerability to the erosion should reveal homo geneous areas for priority interventions.

  10. Mise en oeuvre du Programme de Gestion Durable de l'Azote et évaluation d'impact à l'échelle d'un bassin versant agricole (Arquennes, Belgique

    Directory of Open Access Journals (Sweden)

    Deneufbourg M.

    2010-01-01

    Full Text Available Application of the Action Programme and impact evaluation at a catchment scale (Arquennes, Belgium. Two water catchments exploited by a water supply company (SWDE in the rural village of Arquennes (Hainaut Province, Belgium are contaminated by nitrate (concentrations higher than 50 mg NO3 -.l-1. Catched water is no longer used for distribution. The catchment basins (31 ha and 47 ha are located exclusively in a cultivated area, mainly on loamy soils. Since October 2004, these basins are used as pilot areas for environmental evaluation of good agricultural practices in respect of use of nitrogen fertilizers. Farmers are supervised concerning nitrogen fertilisation with the aim to improve water quality, keeping optimum yield in the same time. This supervision fits into the general pattern of the Sustainable Nitrogen Management Program (PGDA in French, transposition of the European Nitrates Directive in Walloon legislation. Another objective of the working scheme is to study and to set up a decision-making tool concerning prevention of water contamination by agricultural nitrate around water catchments. Water and nitrate flux modelisation in both saturated and non-saturated zones is undertaken. Eight piezometers were drilled on the basins in order to describe soil, subsoil and aquifer and also to follow water table and water quality. Tracer tests in saturated and non-saturated zone were also achieved in order to determine transfer time of contaminants between soil surface and water catchments. The study shows that the impact of a modification of practices in surface can be detected in catched water quality within four or five years at the earliest. A gradual improvement in water quality is being seen in water catchments since the beginning of 2009.

  11. Optimisation de l'utilisation des ressources communes dans le bassin arachidier du Sénégal : évaluation ex ante de plans et d'alternatives de gestion durable

    Directory of Open Access Journals (Sweden)

    Sanogo, D.

    2014-01-01

    Full Text Available Optimizing the use of common resources in the groundnut basin of Senegal: An ex-ante evaluation of plans and alternatives for sustainable management. The preservation of inter village forestry and pastoral spaces (ESPIVs is an endogenous initiative, introduced by local communities in the groundnut basin of Senegal, to meet the combined effects of climate change and resource degradation. Located outside crop-growing areas, these community reserves are a source of fodder for livestock and for local transhumance, and they provide additional income for rural populations. The preservation of these ESPIVs is supported by management tools such as the Simple Management Plan (PSG and the Development and Management Plan (PAG. In some cases, the economic impact of these plans on poverty reduction at the community level is very noticeable. But in other cases, the expectations of the communities are not being met. This article is an ex-ante evaluation of the projected management plans of two ESPIVs in the groundnut basin of Senegal. The results show that simpler management options involving reduced areas would make only a small contribution to local development, even when consolidated with various incitative measures. Management options involving interventions in the infrastructure of vast areas with a high forest-product potential would have a positive impact on the economic surplus of the members of those communities, hence reinforcing possibilities for local development. However, this approach is controversial and simpler management options therefore need to be re-assessed. These simpler options would involve alternatives for revenue generation, such as taxation for access to common land resources by transhumant livestock and the marketing of non-ligneous forest products. This study shows the limits of PSG compared to PAG and proposes alternatives for improved approaches to managing ESPIVs. Thus, the study provides decision-makers with possible negotiating tracks in a situation requiring the sustainable management of common resources within a context of decentralization.

  12. An Analysis of Light Periods of BL Lac Object S5 0716+714 with the MUSIC Algorithm

    Science.gov (United States)

    Tang, Jie

    2012-07-01

    The multiple signal classification (MUSIC) algorithm is introduced to the estimation of light periods of BL Lac objects. The principle of the MUSIC algorithm is given, together with a testing on its spectral resolution by using a simulative signal. From a lot of literature, we have collected a large number of effective observational data of the BL Lac object S5 0716+714 in the three optical wavebands V, R, and I from 1994 to 2008. The light periods of S5 0716+714 are obtained by means of the MUSIC algorithm and average periodogram algorithm, respectively. It is found that there exist two major periodic components, one is the period of (3.33±0.08) yr, another is the period of (1.24±0.01) yr. The comparison of the performances of periodicity analysis of two algorithms indicates that the MUSIC algorithm has a smaller requirement on the sample length, as well as a good spectral resolution and anti-noise ability, to improve the accuracy of periodicity analysis in the case of short sample length.

  13. Lactose carrier protein of Escherichia coli. Structure and expression of plasmids carrying the Y gene of the lac operon.

    Science.gov (United States)

    Teather, R M; Bramhall, J; Riede, I; Wright, J K; Fürst, M; Aichele, G; Wilhelm, U; Overath, P

    1980-01-01

    The previously described hybrid plasmid pC7 which carries lacI+O+delta(Z)Y+A+ on a 12.3 X 10(6)-Mr DNA fragment [Teather et al. (1978) Mol. Gen. Genet. 159, 239-248] was partially digested with the restriction endonuclease EcoRI under conditions reducing the recognition sequence to d(A-A-T-T) and ligated to the vector pB322. lac Y-carrying inserts of various sized (Mr 1.5-4.7 X 10(6)) were obtained. Hybrid plasmid pTE18 (2300-base-pair insert) carries part of the I (repressor) gene, the promotor-operator region, part of the Z (beta-galactosidase) gene, the Y (lactose carrier) gene and part of the A (transacetylase) gene. Upon induction of pTE18-harbouring strains the Y-gene product is expressed at a nearly constant rate for several generations and accumulates to a level of 12-16% of the total cytoplasmic membrane protein. Integration into the membrane leads to active carrier as judged by binding and transport measurements.

  14. Water in the Cratonic Mantle: Insights from FTIR Data on Lac De Gras Xenoliths (Slave Craton, Canada)

    Science.gov (United States)

    Peslier, Anne H.; Brandon, Alan D.; Schaffer, Lillian Aurora; O'Reilly, Suzanne Yvette; Griffin, William L.; Morris, Richard V.; Graff, Trevor G.; Agresti, David G.

    2014-01-01

    The mantle lithosphere beneath the cratonic part of continents is the deepest (> 200 km) and oldest (>2-3 Ga) on Earth, remaining a conundrum as to how these cratonic roots could have resisted delamination by asthenospheric convection over time. Water, or trace H incorporated in mineral defects, could be a key player in the evolution of continental lithosphere because it influences melting and rheology of the mantle. Mantle xenoliths from the Lac de Gras kimberlite in the Slave craton were analyzed by FTIR. The cratonic mantle beneath Lac de Gras is stratified with shallow (water contents extending to higher values than those from the shallow ones. The FTIR spectra of olivines from the shallow samples have more prominent Group II OH bands compared to the olivines from the deep samples, consistent with a more oxidized mantle environment. The range of olivine water content is similar to that observed in Kaapvaal craton peridotites at the same depths (129-184 km) but does not extend to as high values as those from Udachnaya (Siberian craton). The Slave, Kaapvaal and Siberian cratons will be compared in terms of water content distribution, controls and role in cratonic root longevity.

  15. Observations of low and intermediate-frequency-peaked BL Lacs above 100 GeV with VERITAS

    Directory of Open Access Journals (Sweden)

    Errando M.

    2013-12-01

    Full Text Available Most of the ~ 50 blazars detected to date at TeV energies (E > 0.1 TeV are high-frequency-peaked BL Lacs (HBLs. Only a handful episodic detections of low- and intermediate-frequency-peaked BL Lacs (LBL/IBLs, with synchrotron peak frequencies in the infrared and optical regime have been reported by ground-based gamma-ray telescopes, typically during high-flux states. The VERITAS array located in southern Arizona has observed five known TeV LBL/IBLs since 2009: 3C 66A, WComae, PKS 1424+240, S5 0716+714 and BL Lacertae, with exposures of 5-10 hours/year, which so far resulted in the detection of a bright, sub-hour timescale gamma-ray flare of BL Lacertae in June 2011. We also report the detection and characterization of two new IBLs: VER J0521+211 and B2 1215+30.

  16. Hydrogen production by Escherichia coli {delta}hycA {delta}lacI using cheese whey as substrate

    Energy Technology Data Exchange (ETDEWEB)

    Rosales-Colunga, Luis Manuel; Ordonez, Leandro G.; De Leon-Rodriguez, Antonio (Division de Biologia Molecular, Instituto Potosino de Investigacion Cientifica y Tecnologica, Camino a la Presa San Jose 2055, Col. Lomas 4a secc. CP 78216, San Luis Potosi, SLP. Mexico); Razo-Flores, Elias; Alatriste-Mondragon, Felipe (Division de Ciencias Ambientales, Instituto Potosino de Investigacion Cientifica y Tecnologica, Camino a la Presa San Jose 2055, Col. Lomas 4a secc. CP 78216, San Luis Potosi, SLP. Mexico)

    2010-01-15

    This study reports a fermentative hydrogen production by Escherichia coli using cheese whey as substrate. To improve the biohydrogen production, an E. coli {delta}hycA {delta}lacI strain (WDHL) was constructed. The absence of hycA and lacI genes had a positive effect on the biohydrogen production. The strain produced 22% more biohydrogen in a shorter time than the wild-type (WT) strain. A Box-Behnken experimental design was used to optimize pH, temperature and substrate concentration. The optimal initial conditions for biohydrogen production by WDHL strain were pH 7.5, 37 C and 20 g/L of cheese whey. The specific production rate was improved from 3.29 mL H{sub 2}/optical density at 600 nm (OD{sub 600nm}) unit-h produced by WDHL under non-optimal conditions to 5.88 mL H{sub 2}/OD{sub 600nm} unit-h under optimal conditions. Using optimal initial conditions, galactose can be metabolized by WDHL strain. The maximum yield obtained was 2.74 mol H{sub 2}/mol lactose consumed, which is comparable with the yield reached in other hydrogen production processes with Clostridium sp. or mixed cultures. (author)

  17. Sulphite metabolism; Metabolisme du sulfite

    Energy Technology Data Exchange (ETDEWEB)

    Fromageot, P; Chapeville, F [Commissariat a l' Energie Atomique, Saclay (France).Centre d' Etudes Nucleaires

    1960-07-01

    Although the formation of sulphite by micro-organisms was observed as early as 1914 by Neuberg, it was only in 1932 that Nightingale showed it to be present inside cells, in the case of tomato leaf stalks, its formation being due to the reaction: SO{sub 3}H{sup -} + (S{sub 2}O{sub 3}){sub 2}{sup --} {yields} S{sub 2}O{sub 3}{sup --} + O{sub 3}S{sub 2}O{sub 3}{sup --}. The presence of the thiosulphate formed was shown by the high refractive index of its barium salt. Today we have a certain amount of data concerning the formation and use of sulphite in the living cell, even through the knowledge is still incomplete. In this article we will describe and discuss the facts which are known, with particular reference to the oxidation of sulphite. (author) [French] Si la formation de sulfite par des micro-organismes a ete observee des 1914 par Neuberg, sa presence a l'interieur des cellules a ete demontree pour la premiere fois par Nightingale en 1932, dans des tiges et des feuilles de tomates, par la reaction: SO{sub 3}H{sup -} + (S{sub 2}O{sub 3}){sub 2}{sup --} {yields} S{sub 2}O{sub 3}{sup --} + O{sub 3}S{sub 2}O{sub 3}{sup --}. Le thiosulfate forme etait mis en evidence par l'indice de refraction eleve de son sel de baryum. Aujourd'hui on possede un certain nombre de donnees, cependant encore tres incompletes, sur la formation du sulfite et son utilisation par la cellule vivante. Dans cet expose nous decrirons et discuterons quelques-unes de ces acquisitions, tout particulierement celles relatives a l'oxydation du sulfite. (auteur)

  18. Dissemination in athymic nude mice of lacZ transfected small cell lung cancer cells identified by X-gal staining

    DEFF Research Database (Denmark)

    Rømer, M U; Christiansen, J; Brünner, N

    1995-01-01

    The small cell lung cancer cell lines GLC-2 and DMS 456 were genetically labeled with the lacZ gene and examined for invasive and metastatic potential in META/Bom nude mice. The lacZ gene encodes the enzyme beta-D- galactosidase, and cells expressing this enzyme were identified by staining...... with the chromogenic substrate X-gal. lacZ expressing cells were investigated after subcutaneous (s.c.) inoculation and intravenous (i.v.) injection. The X-gal detection of beta-D-galactosidase activity proved to be a rapid and easy means for specific and highly sensitive identification of metastases. All primary s.......c. tumors stained by X-gal. The primary tumors of GLC-2 regularly demonstrated local invasive growth and produced multiple metastases in several organs. In contrast, primary DMS 456 tumors only occasionally demonstrated local invasion and very rarely generated secondary foci. No experimental metastases were...

  19. Distinct roles of two ceramide synthases, CaLag1p and CaLac1p, in the morphogenesis of Candida albicans

    DEFF Research Database (Denmark)

    Cheon, Seon Ah; Bal, Jyotiranjan; Song, Yunkyoung

    2012-01-01

    p) and Lac1p (CaLac1p) are functionally distinct. Lack of CaLag1p, but not CaLac1p, caused severe defects in the growth and hyphal morphogenesis of C. albicans. Deletion of CaLAG1 decreased expression of the hypha-specific HWP1 and ECE1 genes. Moreover, overexpression of CaLAG1 induced pseudohyphal...... growth in this organism under non-hypha-inducing conditions, suggesting that CaLag1p is necessary for relaying signals to induce hypha-specific gene expression. Analysis of ceramide and sphingolipid composition revealed that CaLag1p predominantly synthesizes ceramides with C24:0/C26:0 fatty acid moieties...

  20. Monnaie du commun et revenu social garanti

    OpenAIRE

    Baronian, Laurent; Vercellone, Carlo

    2015-01-01

    Le but de cet article est de poser les bases d’une approche de la monnaie du commun à partir d’une interrogation évincée par la théorie économique des biens communs. Notre analyse de la relation entre monnaie et théorie du commun s’articulera en trois parties. Dans la première, il s’agit d’établir une conception dynamique du commun au singulier dans laquelle la question de la monnaie et des mutations de la division du travail occupe une place centrale. Cette démarche fondée sur la triade trav...