Mermoz Boabab, Senegal
Mermoz Boabab, Senegal

Time filter

Source Type

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.


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.


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.


PubMed | Cairo University, Sahel Teaching Hospital and University of the Sahel
Type: | Journal: Biomaterials research | Year: 2016

Bio-products from stem/progenitor cells, such as extracellular vesicles, are likely a new promising approach for reprogramming resident cells in both acute and chronic kidney disease. Forty CKD patients stage III and IV (eGFR 15-60mg/ml) have been divided into two groups; twenty patients as treatment group A and twenty patients as a matching placebo group B. Two doses of MSC-derived extracellular vesicles had been administered to patients of group A. Blood urea, serum creatinine, urinary albumin creatinine ratio (UACR) and estimated glomerular filtration rate (eGFR) have been used to assess kidney functions and TNF-, TGF-1 and IL-10 have been used to assess the amelioration of the inflammatory immune activity.Participants in group A exhibited significant improvement of eGFR, serum creatinine level, blood urea and UACR. Patients of the treatment group A also exhibited significant increase in plasma levels of TGF-1, and IL-10 and significant decrease in plasma levels of TNF-. Participants of the control group B did not show significant improvement in any of the previously mentioned parameters at any time point of the study period.Administration of cell-free cord-blood mesenchymal stem cells derived extracellular vesicles (CF-CB-MSCs-EVs) is safe and can ameliorate the inflammatory immune reaction and improve the overall kidney function in grade III-IV CKD patients.


Chamseddine A.H.,Lebanese University | Chamseddine A.H.,University of the Sahel | Chamseddine A.H.,University Medical Center | Jawish R.M.,Lebanese University | And 2 more authors.
European Journal of Orthopaedic Surgery and Traumatology | Year: 2011

We present a rare case of associated distal triceps tendon avulsion with radial head fracture; the lateral and medial collateral ligaments of the elbow were also ruptured. The patient underwent surgical procedure for the reinsertion of the triceps tendon using metallic anchors, radial head prosthetic replacement, and repair of the lateral collateral ligament. We believe this combined injury pattern of radial head fracture with triceps tendon rupture or avulsion should be considered according to the concept of the spectrum of elbow instability. © 2011 Springer-Verlag.


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.


Chamseddine A.H.,University of the Sahel | Zein H.K.,University of the Sahel | Hamdan H.R.,University of the Sahel | Khalil B.N.,University of the Sahel | Obeid B.M.,University of the Sahel
European Journal of Orthopaedic Surgery and Traumatology | Year: 2010

We present a case of distal radial shaft fracture associated with elbow dislocation and coronoid process fracture. The associated coronoid fracture was initially missed. Closed reduction of the elbow and open reduction with internal fixation of the radial fracture were achieved immediately after admission. Radiographic control 3 days later showed that the elbow was redislocated into the cast. A careful reevaluation of the radiographs disclosed the coronoid fracture. An anterior approach of the elbow permits to reduce and fix the coronoid process. In addition, a hinged external fixator was applied to maintain concentric elbow reduction, and to protect the coronoid fracture fixation and the capsulo-ligamentous healing, while early elbow motion was started. The final result at 10-year follow-up was excellent both clinically and radiologically. According to our knowledge, a similar presentation of distal radial shaft fracture with ipsilateral unstable complex elbow dislocation and fracture of the coronoid process has never been described in the previous literature. © 2009 Springer-Verlag.


Chamseddine A.,University of the Sahel | Zein H.,University of the Sahel | Obeid B.,University of the Sahel | Khodari F.,University of the Sahel | Saleh A.,University of the Sahel
Chirurgie de la Main | Year: 2011

We present a case of a 23 year-old man who presented to the emergency department after sustaining indirect trauma to the left elbow with unremarkable physical examination and normal radiographs. He presented again three weeks after with repeated episodes of locking and snapping of the left elbow occurring every time he attempted to rise from a chair while pushing the armrests, and when manoeuvring the steering wheel of his vehicle. On physical examination, the patient was apprehensive to the " lateral pivot shift" test as described by O'Driscoll et al. (1991) [1]. MRI of the left elbow demonstrated avulsion of the proximal epicondylar insertion of the lateral collateral ligament complex (LCLC). The " lateral pivot shift test" was positive under general anaesthesia. Lateral elbow radiograph taken during the test showed widening of the ulno-humeral joint space with posterior subluxation of the radial head. The patient underwent surgical treatment for posterolateral rotatory instability (PLRI) of the elbow. This case report aims to highlight the clinical aspects of the PLRI which may occur after a simple elbow sprain and be easily missed if not suspected; it also aims to draw attention to the importance of the " lateral pivot shift test" and the value of the stress lateral elbow radiograph in establishing the diagnosis of this rare and subtle entity. © 2011 Elsevier Masson SAS.


Chamseddine A.H.,University of the Sahel | Alasiry A.A.,University of the Sahel | Zein H.K.,University of the Sahel
European Journal of Orthopaedic Surgery and Traumatology | Year: 2012

We present a case of spontaneous simultaneous bilateral hip fracture in an elderly female patient suffering undiagnosed osteomalacia. She underwent staged bilateral cemented bipolar hemiarthroplasty and received long-term medical treatment for osteomalacia. Our aim is to stress on the clinical value of unexplained chronic bilateral groin pain predicting the occurrence of these fractures and on the importance of evaluating serum levels of vitamin D, calcium and parathyroid hormone especially in elderly sedentary patients with lack of exposure to sunlight. © Springer-Verlag 2012.


PubMed | University of the Sahel
Type: Case Reports | Journal: Chirurgie de la main | Year: 2011

We present a case of a 23 year-old man who presented to the emergency department after sustaining indirect trauma to the left elbow with unremarkable physical examination and normal radiographs. He presented again three weeks after with repeated episodes of locking and snapping of the left elbow occurring every time he attempted to rise from a chair while pushing the armrests, and when manoeuvring the steering wheel of his vehicle. On physical examination, the patient was apprehensive to the lateral pivot shift test as described by ODriscoll et al. (1991) [1]. MRI of the left elbow demonstrated avulsion of the proximal epicondylar insertion of the lateral collateral ligament complex (LCLC). The lateral pivot shift test was positive under general anaesthesia. Lateral elbow radiograph taken during the test showed widening of the ulno-humeral joint space with posterior subluxation of the radial head. The patient underwent surgical treatment for posterolateral rotatory instability (PLRI) of the elbow. This case report aims to highlight the clinical aspects of the PLRI which may occur after a simple elbow sprain and be easily missed if not suspected; it also aims to draw attention to the importance of the lateral pivot shift test and the value of the stress lateral elbow radiograph in establishing the diagnosis of this rare and subtle entity.

Loading University of the Sahel collaborators
Loading University of the Sahel collaborators