20 research outputs found

    Analysis of dendrometric characteristics of Acacia senegal (L.) Willd. (Fabaceae) in the semi-arid Sahelian area: A case study of silvopastoral zone in Senegal

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    The study gives an analysis of the dendrometric parameters of a middle Sahelian species (Acacia senegal) in semi-arid environment to get better knowledge of its behavior. The research lays the principle that the species behaves differently according to the ecogeographical stations. So, its characteristics change from one environment to another. That is why it is important to do a specific study for every big zone. The study was done in Silvopastoral zone, more particularly in the area where A. senegal is popular in the country. The study aims to deepen the knowledge of A. senegal dendrometric parameters. The following parameters were measured: diameter of the base, breastheight diameter (1.3 m), breast- height circumference, total height of the tree, length of the trunk and width of the houppier. The sample consists of a population of 76 feet locust trees in Senegal. The study confirmed the hypothesis that the characters of the species vary according to the zone where it is found.Keys words: Acacia senegal, dendrometry, Sahel, Senegal

    A rare case of anatomical variation of the femoral artery and vein

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    During a dissection of the two femoral trigons in a female corpse, about 14 years old, we discovered on the right side, the deep artery of the thigh arising from the medial side of the femoral artery and passed in front of the femoral vein above the mouth of the great saphenous vein; on both sides, there was the presence of a collateral canal which communicated the external iliac vein with the femoral vein on the right, on the left, it communicated the external iliac vein with the quadricipital vein. The lower part of the femoral vein was duplicated on both sides, but on the right, there was an interconnecting channel between the two trunks of the duplication. Variations of the femoral vessels are very frequent and can be responsible for an incident during the practice of certain gestures at the level of the femoral trigon such as: catheterization of the femoral artery or vein, the treatment of femoral hernias. Key words: Deep thigh artery, collateral venous canal, external iliac vein, anatomic variations

    Étude et prise en compte en modĂ©lisation de l’effet de la latitude sur la rĂ©ponse Ă  la photopĂ©riode chez divers gĂ©notypes de mil (Pennisetum glaucum (L.) R. Br.) du SĂ©nĂ©gal

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    Objectif : L’étude a portĂ© sur la caractĂ©risation des variations de cycles de diffĂ©rents gĂ©notypes de mil cultivĂ©s au SĂ©nĂ©gal sous diffĂ©rentes latitudes et l’amĂ©lioration de la modĂ©lisation de leur rĂ©ponse Ă  la photopĂ©riode.MĂ©thodologie et rĂ©sultat : Des essais Ă  plusieurs dates de semis (12 juin, 10 juillet et 08 aoĂ»t) ont Ă©tĂ© conduits en 2012 sur 3 sites (Ndiol, Bambey et Kolda) au SĂ©nĂ©gal dans un dispositif en blocs complets randomisĂ©s Ă  3 rĂ©pĂ©titions, et sous de bonnes conditions d’alimentation hydrique et de fertilitĂ©. Le matĂ©riel vĂ©gĂ©tal Ă©tait composĂ© de 2 variĂ©tĂ©s amĂ©liorĂ©es, de type Souna, et de 6 Ă©cotypes locaux dont 2 de type Souna et 4 de type Sanio, qui ont Ă©tĂ© collectĂ©s suivant un gradient latitudinal nord-sud en mai 2011. Une caractĂ©risation des durĂ©es semis-feuille drapeau de ces gĂ©notypes a Ă©tĂ© faite en fonction des dates de semis et de la latitude. Le modĂšle Impatience a Ă©tĂ© paramĂ©trĂ©e puis utilisĂ© pour simuler les dates d’initiation paniculaire sur les sites. Les rĂ©sultats ont montrĂ© que les durĂ©es semis-feuille drapeau diminuaient avec les semis tardifs et augmentaient avec la latitude, avec une diffĂ©rence entre sites plus marquĂ©e pour les semis prĂ©coces. Le paramĂ©trage du modĂšle Impatience obtenu Ă  Bambey ne permettait pas de simuler correctement les durĂ©es de la phase vĂ©gĂ©tative Ă  Ndiol et Ă  Kolda. Une Ă©quation de correction a Ă©tĂ© proposĂ©e pour estimer les paramĂštres du modĂšle Ă  Ndiol et Ă  Kolda en prenant en compte les latitudes de ces sites et le paramĂ©trage du modĂšle Ă  Bambey. Cette procĂ©dure a permis de simuler correctement les dates d’initiation paniculaire de ces sites avec des valeurs de RMSE proches de celles obtenues si le paramĂ©trage spĂ©cifique de chacun de ces sites Ă©tait utilisĂ©.Conclusion et application : Cette Ă©tude a permis de montrer que la plupart des variĂ©tĂ©s traditionnelles, prĂ©coces comme tardives, sont plus ou moins photosensibles. La mĂ©thode de correction du Psens proposĂ©e a permis d’amĂ©liorer les performances du modĂšle. Ce rĂ©sultat trouve une application opĂ©rationnelle en modĂ©lisation des cultures et ses applications dont la prĂ©vision agricole.Mots clĂ©s : Latitude, PhotopĂ©riode, ModĂ©lisation, Pennisetum glaucum (L.) R. Br.), ModĂšle SarraH, SĂ©nĂ©ga

    Schistosoma mansoni infection in a recently exposed community in Senegal: lack of correlation between liver morphology in ultrasound and connective tissue metabolites in serum

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    Four hundred and seventy villagers of Ndombo, a village with recently established intensive transmission of Schistosoma mansoni in the Senegal River Basin, were enrolled in a study with the intention to assess hepatosplenic morbidity. All patients were examined parasitologically and by ultrasound. Hepatic fibrosis serum markers were determined in 153 adult patients (aminoterminal propeptide of procollagen type III, hyaluronan and laminin). By ultrasound, about 60% of the patients showed early stages of hepatic involvement, 3% of the patients unequivocally showed severe hepatosplenic pathology (grade 3 according to the Managil classification), whereas in another study performed in the same village 3 years earlier, no patients with severe hepatosplenic pathology had been found. No correlation between the aminoterminal propeptide of procollagen type III, hyaluronan or laminin and the ultrasound findings could be established. These hepatic fibrosis serum markers do not seem to be a sensitive method to detect early hepatic fibrosis in schistosomiasis
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