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Mermoz Boabab, Senegal

Chamseddine A.H.,Lebanese University | Chamseddine A.H.,University of the Sahel | Jawish R.M.,Lebanese University
European Journal of Orthopaedic Surgery and Traumatology | Year: 2012

We present a case of incomplete or perched irreducible elbow dislocation, which occurred spontaneously into cast immobilisation performed for a diagnosis of "elbow sprain". Initial anteroposterior unstressed elbow radiograph revealed a subtle widening of the lateral aspect of the radiohumeral joint space. Because of the unusual irreducibility of this subluxation, the patient underwent surgical exploration which showed the lateral collateral ligament complex and capsule to be interposed into the radiohumeral joint space and interfering with elbow reduction. This case report intends to draw attention on the radiographic sign of widening of the radiohumeral joint space on the unstressed anteroposterior elbow radiograph as a predictive sign of instability and to document the anatomic lesion that leads to this presentation. © 2011 Springer-Verlag. Source

Kone A.W.,University dAbobo Adjame | Edoukou E.F.,University dAbobo Adjame | Gonnety J.T.,Sudan University of Science and Technology | N'Dri A.N.A.,Sudan University of Science and Technology | And 3 more authors.
Agroforestry Systems | Year: 2012

This paper attempts to provide a new perception of the weed Chromolaena odorata (Asteraceae) which is considered as a plague in agriculture or as a soil fertility indicator. The study was conducted in the forest-savanna transition zone of Côte d'Ivoire and aimed to compare soil biological activity and plant nutrient availability under three well-represented vegetation features, including C. odorata lands (ChrO), shrub savannas (ShrS), and grass savannas (GraS). Each of these vegetation features included five plot replicates (50 m × 50 m size) distributed in the landscape. Soil chemical parameters such as pH, organic matter, soluble phosphorus, exchangeable bases, and biological parameters such as abundance and diversity of earthworms, and soil enzymatic activities were investigated. Composite soil samples were collected and analyzed for chemical and microbial parameters while earthworms were sampled using the Tropical Soil Biology and Fertility 25 × 25 × 30 cm soil monolith method. A principal component analysis showed a clear demarcation between C. odorata plots and the savanna ones. Soluble P and exchangeable bases were significantly higher under ChrO than under both savannas. Earthworm density was twice higher under ChrO (433. 3 ± 90. 8 ind m -2) than under ShrS (173.9 ± 61.5 ind m -2) and GraS (176. 0 ± 40. 6 ind m -2) and this was accounted for by the abundance of detritivores and polyhumics. Acid and alkaline phosphatase activities under ChrO (2. 9 ± 0. 2 and 2. 5 ± 0. 3 μmol pNP g -1 soil h -1, respectively) were twice higher than under both savannas. Based on the fact that ChrO and ShrS were located on similar soil types and had the same topographic position, we concluded that the establishment of C. odorata in a savanna land and its subsequent high biomass and quality-litter production were mostly the reasons of the improvement in soil biology and plant nutrient availability. Between-savanna comparison showed that ShrS, with higher CEC and exchangeable bases, was somewhat more fertile than GraS, probably because of a better soil physical status. In view of the agronomic potentials of the shrub C. odorata, it may be taken as a basis for improved fallow in Africa. © 2012 Springer Science+Business Media B.V. Source

Kone A.W.,University dAbobo Adjame | Edoukou E.F.,University dAbobo Adjame | Orendo-Smith R.,Stellenbosch University | Tondoh J.E.,University of the Sahel
Pedobiologia | Year: 2012

The species Chromolaena odorata (Asteraceae) is a notorious invasive shrub spreading throughout West and Central Africa and as such, there is a need to determine its environmental impact, particularly on soil biodiversity and functioning. Indeed, soil organisms such as earthworms are known to strongly influence soil properties and biogeochemical cycles. This study, conducted in Central Côte d'Ivoire, aims to investigate the temporal dynamics of earthworm communities in . C. odorata fallows of different ages and to identify associated indicators and persistent species. Three distinct classes of fallows identified by local farmers, were considered: young (1-3. years, C1), medium-aged (4-8. years, C2) and old (>9. years, C3). Each of the classes included four plot replicates where earthworms were sampled using the Tropical Soil Biology and Fertility (TSBF) 25. cm. ×. 25. cm. ×. 30. cm soil monolith method. The study of earthworm communities was focused on density, biomass, diversity and complementarity. Indicator values (IndVals) were used to identify indicator species of the classes of fallows. The shrub exerted a mixed influence on earthworms depending on the functional group, with litter feeders and polyhumics declining over time as a result of a reduction of the litter availability on the soil surface. The species richness was significantly greater in C1 than in the other classes although the Shannon-Weaver's index did not vary significantly. However, a cluster analysis performed on densities highlighted marked differences between C2 and the two other classes in terms of community composition. Indicator species were found for C1 and C2. The geophagous . Millsonia omodeoi has emerged as a persistent species as its density and biomass steadily increased so that it became the dominant species in old fallows. The roles of litters and soil parameters in influencing earthworm communities are discussed. © 2012 Elsevier GmbH. Source

N'Dri J.K.,Catholic University of Louvain | Andre H.M.,Musee Royal de lAfrique centrale | LagerloF J.,Swedish University of Agricultural Sciences | Tondoh J.E.,University of the Sahel | Hance T.,Catholic University of Louvain
Current Zoology | Year: 2013

This study aims to assess the impact of monospecific Tectona grandis forest plantation on the soil mite abundance and diversity. To achieve these objectives, two sites situated in Ivory Coast were investigated. The first, a primary forest was characterized by a very weak human activities whereas the second, a teak plantation was characterized by a high disturbance performed during the planting. After extracting, sorted and description, 116 mite species were described in the two sites. Mite densities were lower in teak plantation and also higher in the litter and decreased to the depth in both sites. Species richness re-corded in teak plantation (52 species) was significantly lower compared to primary forest (98 species). The same trend was ob-served for Oribatida but not for Gamasida. The lower Oribatida (5 vs. 17) and higher Oribatida (24 vs. 41) were recorded respec-tively in teak plantation and primary forest. Mite Shannon index and evenness were significantly different between sites. High Jaccard index values and the appearance of exclusive species in both habitats showed that the sites are very distinct. Total number of species recorded corresponded to 58%-63% of the total number of species estimated by ACE and Chao 1&2 estimators, indi-cating that the sampling effort was not sufficient. Mite abundance and diversity varied depending on the characteristics of habi-tats. Chemical element (Corg, Ctot, Ntot, and SOM) values were lower in teak plantation (disturbed habitat) and significantly dif-ferent to primary forest in the topsoil. Apart from litter height, soil depth, pH and C/N ratio, others variables were strongly corre-lated to mite abundance and diversity. © 2013 Current Zoology. Source

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