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Institution

Abdou Moumouni University

EducationNiamey, Niamey, Niger
About: Abdou Moumouni University is a education organization based out in Niamey, Niamey, Niger. It is known for research contribution in the topics: Population & Agriculture. The organization has 796 authors who have published 808 publications receiving 17478 citations. The organization is also known as: University of Niamey & Abdou Moumouni Dioffo University.


Papers
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Journal ArticleDOI
TL;DR: The tritium isotopes stables 18 O and 2 H and radioactifs 3 H and 14 C ont permis d'identifier un ecoulement general d'est en l'ouest du Tibesti au bassin du Djado and, dans une moindre proportion, nord-sud selon la direction de la flexure de Bilma (axe du synclinal) as discussed by the authors.
Abstract: Resume Les isotopes stables 18 O et 2 H et radioactifs 3 H et 14 C ont permis d'identifier un ecoulement general d'est en l'ouest du Tibesti au bassin du Djado et, dans une moindre proportion, nord-sud selon la direction de la flexure de Bilma (axe du synclinal). Une autre composante existe du nord-est vers le sud-ouest a la faveur d'infero-flux d'oueds descendant le Hoggar. Les principales aires de recharge des aquiferes sont les massifs du Tibesti et la bordure orientale du Hoggar. La presence du tritium permet d'envisager le phenomene de drainance : jusqu'a 2,5 ± 1,0 UT dans le Cambrien, 1,8 ± 1,0 UT dans le Viseen, 2,9 ± 1,0 dans le Continental intercalaire CI. Le Cambrien alimente par drainance le Carbonifere et le CI. L'exutoire principal est caracterise par l'evaporation des eaux des aquiferes excepte celles du Cambrien ; en effet, ces dernieres sont proches de la droite meteorique locale des regions arides et semi-arides δ 2 H = 8 δ 18 O + 5. Les variations piezometriques saisonnieres sont la consequence, a la fois d'un transfert de masse des precipitations sur les massifs et de la charge dans les aquiferes (drainance).

5 citations

Journal ArticleDOI
TL;DR: Ram fertility of both breeds was maintained in line with the established norms throughout the year, thus suggesting that rams might be mated with ewes year-round, and Peul rams appeared more sensitive to Sahelian climate variations than Touareg rams.
Abstract: A study on the morphological parameters of ram sperm was carried out in an experimental station in Niger during three years. Six bicolor Peul rams and five Touareg rams were used. Sperm from each ram was collected after two consecutive ejaculations once a month with an artificial vagina. Means (± SE) of the various parameters studied in Peul and Touareg rams were, respectively: live weight 47.75 ± 3.75 kg and 49.98 ± 2.99 kg; sperm volume 1.73 ± 0.36 ml and 1.78 ± 0.33 ml; sperm gross motility 4 ± 0.61 and 3 ± 0.49; spermatozoon concentration 4265 x 10 6 ± 762 x 10 6 spz/ml and 4953 x 10 6 ± 583 x 10 6 spz/ml; total number of spermatozoa 7469 x 10 6 ± 2382 x 10 6 spz and 8877 x 10 6 ± 2323 x 10 6 spz; percentage of dead spermatozoa 12 ± 10% and 19 ± 19%; percentage of abnormal spermatozoa 13 ± 12% and 17 ± 11%. The mean weight of Touareg rams was significantly higher (p < 0.05) than that of Peuls. The dry cool season significantly (p < 0.05) and negatively affected the live weights of both breeds. Mean volumes of ejaculated sperm were not significantly (p < 0.05) different between the two breeds, except during the months of July and August. Significant (p < 0.05) differences were found between the two breeds with regard to the other parameters studied. Peul rams appeared more sensitive to Sahelian climate variations than Touaregs. Under the experimental conditions of the study (i.e. in station and under good management), ram fertility of both breeds was maintained in line with the established norms throughout the year, thus suggesting that rams might be mated with ewes year-round. Further studies would help determine the impact of traditional breeding conditions, season, individual characteristics on male and female fertility parameters, and consequently on the flock size.

5 citations

Journal ArticleDOI
TL;DR: The potential of perimeter trap cropping, using short and extra‐short duration pigeon pea, sorghum and cotton, was evaluated in Niger as an agroecological alternative to pesticide application on okra for the management of the tomato fruit worm (TFW) Helicoverpa armigera (Hübner).
Abstract: The potential of perimeter trap cropping, using short and extra-short duration pigeon pea (SD PP and ESD PP), sorghum and cotton, was evaluated in Niger as an agroecological alternative to pesticide application on okra for the management of the tomato fruit worm (TFW) Helicoverpa armigera (Hubner). In 2008, infestation by TFW and damage by fruit worms of unsprayed okra with SD PP borders was intermediate between cypermethrin-sprayed and unsprayed pure okra crops. In 2009, the cypermethrin-sprayed okra was significantly less damaged by fruit worms than in the unsprayed pure okra, as well as in the unsprayed okra crops with SD PP, sorghum and cotton borders. In 2010, the pure okra crop sprayed with cypermethrin was significantly less infested by TFW than the unsprayed pure okra crop and the unsprayed okra crop with SD PP borders. The unsprayed okra crop with ESD PP borders was intermediate between cypermethrin-sprayed and unsprayed pure okra crops. The slightly lower TFW infestation of the unsprayed okra crop with ESD PP borders was a result of increased top-down regulation by predator spiders, whose colonization was significantly higher on the unsprayed okra crop with ESD PP borders than on both (sprayed and unsprayed) pure okra crops. (Resume d'auteur)

5 citations

Journal ArticleDOI
D. Moussa1, A. Soumana, S.M. Amadou, I. Soli1, I. Tahirou1, A. Ali1 
TL;DR: Les endocrinopathies susceptibles of donner une infertilite masculine sont nombreuses; elles peuvent etre congenitales ou acquises and concerner plusieurs etages, hypothalamo-hypophysaire, testiculaire.

5 citations

Journal ArticleDOI
08 Jan 2009
TL;DR: Le dosage de l’acetylcholinesterase dans les erythrocytes est un bon indicateur d’exposition professionnelle aux organophosphores et aux carbamates dans la campagne 2006 de traitements phytosanitaires dans 4 des regions du Niger.
Abstract: Le dosage de l’acetylcholinesterase dans les erythrocytes est un bon indicateur d’exposition professionnelle aux organophosphores et aux carbamates L’etude a porte sur 103 personnes consentantes, dont 91% de sexe masculin avec un âge moyen de 43 ± 16 ans et un poids corporel de 65 ± 17 kg ; et 9% de sexe feminin avec un âge moyen 38 ± 15 ans et un poids corporel de 67 ± 21 kg Toutes ces personnes sont impliquees dans la campagne 2006 de traitements phytosanitaires dans 4 des regions du Niger ou le probleme des acridiens se pose avec plus d’acuite L’analyse clinique somatique et les enquetes anamnestiques effectuees sur les participants a cette etude, n’ont revele ni d’antecedents cliniques graves, ni de cas empoisonnements aux pesticides Le dosage de l’acetylcholinesterase erythrocytaire a ete realise a la temperature ambiante de laboratoire (25°C) a l’aide de l’appareil Test Mate® model 400, methode spectrophotometrique La cholinesterasemie moyenne de pre-exposition des 103 personnes est de 3,63 ± 0,61 U/ml, celle des sujets masculins est de 3,57 ± 0,53 U/ml et celle des sujets feminins est de 3,48 ± 0,44 U/ml, cette difference n’est pas significative Apres l’exposition aux organophosphores, une legere baisse de la cholinesterasemie des 103 personnes a ete observee par rapport a leur valeur de pre-exposition, elle est de 3,21 ± 0,17 U/ml ; celle des personnes de sexe feminin est de 3,48 ± 0,44 U/ml et celle des personnes de sexe masculin est de 3,57 ± U/ml Dix sept personnes (16,50%) sur 103 presentent une hypocholinesterasemie, puisque leur taux d’inhibition varie de 31% a 36% Parmi ces 17 personnes, 9 (53%) ont un taux d’inhibition superieur a 40% par rapport a leur valeur de reference Aucun cas de syndrome cholinergique n’a ete decele parmi les 17 personnes dont le taux d’inhibition le seuil de 30% tel que recommande par l’Organisation mondiale de sante

5 citations


Authors

Showing all 802 results

NameH-indexPapersCitations
Jan Bogaert6959518499
Mahabir P. Gupta392335868
Ali Djibo27412233
Guillaume Favreau23511671
S. Selvakumar18681155
Jean Lejoly171141343
Guillaume Favreau15321065
Jean-Claude Micha1581832
Abdelmajid Soulaymani14213922
Oumarou Ide1416892
Abdul Razak Ibrahim14531020
Ali Mahamane13109688
Boubacar Kadri1334475
Abdou Amza1340468
Mahamane Saadou1258362
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20231
20229
202161
202083
201986
201862