8 research outputs found

    Communautés végétales et faciÚs pastoraux dans la zone de Taourirt-Tafoughalt du Maroc oriental: écologie et inventaire floristique.

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    L’étude a Ă©tĂ© entreprise durant l’annĂ©e 2009 dans la zone «Taourirt-Tafoughalt» situeĂ© Ă  l’Ouest du Maroc oriental. Elle tente d’inventorier la vĂ©gĂ©tation naturelle et de la caractĂ©riser en terme Ă©cologique tout en mettant en relief l’importance des conditions du milieu. La mĂ©thode utilisĂ©e consiste Ă  dĂ©terminer la composition floristique des espĂšces et Ă  dĂ©finir l’état Ă©cologique de la vĂ©gĂ©tation moyennant des relevĂ©s phyto-Ă©cologiques. Les analyses statistiques ont Ă©tĂ© effectuĂ©es Ă  l’aide de l’Analyse Factorielle des Correspondances (AFC). Les principaux rĂ©sultats montrent l’existence de cinq principales formations vĂ©gĂ©tales: (i) forĂȘts, matorrals et steppes arborĂ©es, (ii) steppe Ă  Stipa tenacissima, (iii) steppes dĂ©gradĂ©es mixtes, (iv) steppes dĂ©gradĂ©es Ă  base d’Anabasis aphylla, Peganum harmala, Artemisia herba-alba, Asphodelus microcarpus et Thymelaea microphylla, et (v) steppes trĂšs localisĂ©es Ă  psammophytes (Lygeum spartum et Thymelaea microphylla) et Ă  gypso-halophytes (Salsola vermiculata et Atriplex halimus). Par ailleurs, la composition botanique dominante tĂ©moigne, en gĂ©nĂ©ral, d’une tendance vers une rĂ©gression qualitative importante du couvert vĂ©gĂ©tal. La plupart des formations sont constituĂ©es d’espĂšces indicatrices de dĂ©gradation avancĂ©e: Noaea mucronata, Asphodelus microcarpus, Thymelaea microphylla, Launaea acanthoclada, Anabasis aphylla, Peganum harmala, Urginea maritima, Lygeum spartum. La couverture vĂ©gĂ©tale, en dehors des forĂȘts et des steppes alfatiĂšres, est trĂšs faible (<15%). La pluviositĂ©, la lithologie (charge caillouteuse), la gĂ©omorphologie (gĂ©ologie, pente, topographie, exposition), le type de sols et l’influence anthropique, restent les principales variables qui dĂ©terminent la rĂ©partition des groupements vĂ©gĂ©taux. La texture du sol conditionne particuliĂšrement les groupements de situations extrĂȘmes, tels que les psammophytes et gypso-halophytes. L’examen phyto-sociologique n’a concernĂ© que les formations dominĂ©es par Stipa tenacissima. Cet examen montre des affinitĂ©s entre faciĂšs pastoraux et formations, exprimĂ©es par l’existence d’espĂšces communes

    Water productivity improvement of cereals and foods legumes in the Atbara Basin of Eritrea

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    The project ‘Water Productivity Improvement of Cereals and Food Legumes in the Atbara Basin of Eritrea’ is an example of organization and implementation of farmers’ participatory research, conducted utilizing the available indigenous knowledge while empowering farming communities. Farmers have been partners in technology development with extension and research, with full decision-making power in planning, implementation, monitoring, and evaluation. The project produced, in partnership with farmers, new varieties of cereals and food legumes which have proven farmer acceptability; established seed systems which supply farmers with quality seed in a sustainable manner; enhanced farmers’ skills in participatory research and in community based seed production; strengthened the capacity of National Institutions to carry out participatory research and technology transfer, and strengthened linkages between research, seed, and extension departments by working together in cooperation with farmers and farmers’ communities. Working conditions, during the course of the project were not always easy and became challenging towards the end of the project, but to work with farmers and learn from them has been an extremely rewarding experience

    Integrated Ugi-Based Assembly of Functionally, Skeletally, and Stereochemically Diverse 1,4-Benzodiazepin-2-ones

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    A practical, integrated and versatile U-4CR-based assembly of 1,4-benzodiazepin-2-ones exhibiting functionally, skeletally, and stereochemically diverse substitution patterns is described. By virtue of its convergence, atom economy, and bond-forming efficiency, the methodology documented herein exemplifies the reconciliation of structural complexity and experimental simplicity in the context of medicinal chemistry projects.This work was financially supported by the Galician Government (Spain), Projects: 09CSA016234PR and GPC-2014-PG037. J.A. thanks FUNDAYACUCHO (Venezuela) for a predoctoral grant and Deputación da Coruña (Spain) for a postdoctoral research grant. A.N.-V. thanks the Spanish government for a Ramón y Cajal research contract

    Role and Function of Adenosine and its Receptors in Inflammation, Neuroinflammation, IBS, Autoimmune Inflammatory Disorders, Rheumatoid Arthritis and Psoriasis

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