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Geomaterials 2020年第2期10卷 25-34页

作者： abdoulaye diedhiou Libasse Sow Adama Dione Civil Engineering Department Higher Polytechnic School Cheikh Anta Diop University Dakar Senegal Institute of Earth Sciences Cheikh Anta Diop University Dakar Senegal

This paper presents a comparative study of Physical-Chemical characteristics of Limestone and Basalt (from Senegalese quarries). First, chemical tests show that Basalt is richer in silica 51.59% versus 2.84% for Limestone. Basalt is made up of silica minerals and essentially carbonated minerals with a CaO percentage of 50.05%. Chemical results also show that Basalt is richer in iron 12.71% versus 0.44% for Limestone. Finally, they revealed a fire loss of 40.91% for Limestone and 2.44% for Basalt. Second, physical analysis results show that Diack Basalt has the best characteristics with a flattening coefficient of 5% between 5% and 20%;the percentage of pollutants is 0.36% less than 1%;the Los Angeles coefficient is 12.21% below 15, while Bandia Limestone gives a flattening coefficient of 3%;the Los Angeles coefficient of 40.17% and the percentage of pollutant (2.4%) well above 2%. It is noted that the percentage of Limestone pollutant is too high. These important results show the net advantage of Basalt compared to Limestone in terms of physical-chemical characteristics.

关键词： Ballast Railways Basalt Limestone Physical-Chemical Characteristic

Experimental Characterization of Shape of an Aggregate by a Numerical Value—Application to Senegalese Basaltic Aggregates for Rail Transport

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Open Journal of Civil Engineering 2020年第2期10卷 131-142页

作者： abdoulaye diedhiou Libasse Sow Ndeye Mareme Diop Civil Engineering Department Higher Polytechnic School Cheikh Anta Diop University of Dakar Dakar Senegal

This article first talks about railways in general and ballast in particular. An inventory is then made on the modernization of the Senegalese ballast railways. In the second phase, an experimental work of characterization of basaltic aggregates of Diack (Locality of Ngoundiane, Thiès region, Senegal) is presented. The grain size studied is 25/50 mm as for any material studied for use as railway ballast. Experimental work presented consists of the characterization of the shape of an aggregate using the NF P 18-301 standard. The test consists of comparing the volume of the aggregate to that of an equivalent sphere with the largest diameter of the aggregate, by calculating the average volume coefficient. With a Representative Elementary Volume (REV) of 6 aggregates, the volume coefficient “Cv” fluctuates between 0.27 and 0.49 with an average volume coefficient of 0.39 which is well above 0.15. The grains studied are polyhedral and therefore have a high mechanical resistance.

关键词： Ballast Rail Transport Basalt Shape Volume Coefficient

Experimental Geotechnical Characterization Campaign of the Matam Soil for Lithology: Application to the Study of Supports of the Balterdi Bridge

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Open Journal of Civil Engineering 2021年第2期11卷 200-215页

作者： abdoulaye diedhiou Libasse Sow Gorgui Thierno Yoro Diouf Mbene Diop Ndeye Mareme Diop Civil Engineering Department Higher Polytechnic School Cheikh Anta Diop University of Dakar Dakar Senegal Technosol Engineering Laboratory Dakar Senegal

This paper presents a geotechnical study whose objective is to determine the lithology of the soil of Balterdi village (Matam, Senegal). A bridge-type structure with six supports is to be built on the studied site. The drilling program consisted of six core drillings (SC) each 30 m deep with sampling and six destructive drillings with pressuremeter tests (SP) every 1.5 m up to 30 m deep. A pair of core and pressuremeter tests was carried out under each support. From the results of the core drill holes and the geological model of the site, it can be seen that the lithology of the soil along the structure consists essentially of soft clay layers, becoming firm at depth over the first 18 m on average (with some incursions of sandy layers) resting on medium to compacted sand up to 30 m. Brown clayey fill is also present between piers P3 and P5. The presence of a watercourse along the structure is noted. The foundations will therefore be carried out in the water. The results of the pressuremeter tests confirm the homogeneity of the soil over the whole area. Indeed, the values obtained are almost similar for all the tests. According to the limit pressures obtained, the clayey-sandy formations encountered along the structure are respectively soft to firm and moderately compact to compact. Their limit pressures are high enough to allow good bearing capacities.

关键词： Geotechnical Behaviour Cored Surveys Pressuremeter Surveys Lithology Bridge Supports

Potassium sources, microorganisms and plant nutrition: Challenges and future research directions

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Pedosphere 2023年第1期33卷 105-115页

作者： abdoulaye SOUMARE Djibril SARR Abdala G.DIÉDHIOU UFR ST Departement of AgroforestryAssane Seck University of Ziguinchor(UASZ)Ziguinchor BP 523Senegal Laboratoire Commun de Microbiologie(LCM) IRD/ISRA/UniversitéCheikh Anta Diop(UCAD)Centre de Recherche de Bel AirDakar BP 1386Senegal Centre d’Excellence Africain en Agriculture pour la SécuritéAlimentaire et Nutritionnelle(CEA-AGRISAN) UCADDakar BP 5005Senegal Département de Biologie Végétale Facultédes Sciences et TechniquesUCADDakar BP 5005Senegal

Until recently,potassium(K)has not received considerable attention because of the general belief that soils contain ample amounts of this *** addition,low rates of K fertilizer application in agriculture have led to rapid depletion of K in the rhizosphere soil in many underdeveloped *** results in various negative impacts,including preventing optimum utilization of applied nitrogen and phosphorus *** compensate for these losses,massive use of K fertilizers in agriculture has been *** fertilizers are manufactured from rock minerals,particularly sylvite(KCl)and carnallite(KCl·MgCl2·6H2O).Unfortunately,to date,there is no cost-effective technology available for converting rock minerals into potassic ***-solubilizing microorganisms(KSMs)can release K from soil/minerals into plant-available forms,which could be a sustainable *** possibility of using KSMs as efficient biofertilizers to improve crop production has been increasingly highlighted by *** this review,the existing forms of K in soils and their availability and dynamic equilibrium are *** addition,different K fertilizers and their advantages and disadvantages for crops are ***,the microorganisms usually reported as K solubilizers,the research progress on KSMs,and future insights on the use of these KSMs in agriculture are *** and analyses of the published literature show that organic acid production is the common mechanism of K solubilization by bacteria and *** review may serve as a proposal for the future research avenues identified here.

关键词： biofertilizer crop production organic acid K solubilization K-solubilizing microorganisms rock minerals

Rosai Dorfman Destombes’s Disease about 5 Cases

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Open Journal of Internal Medicine 2020年第2期10卷 212-222页

作者： Michel Assane Ndour Boundia Djiba Baï di Sy Kane Pape Guirane Ndiaye Demba diedhiou Mouhamed Dieng Barane Thiam Rosa Bampoky Muriel Diembou Atoumane Faye Maimouna Ndour Mbaye Anna Sarr abdoulaye Pouye Department of Internal Medicine Abass Ndao Hospital Center Dakar Senegal Department of Internal Medicine Aristide Le Dantec Hospital Center Dakar Senegal

Rosai Dorfman’s Disease (RDD) Destombes also called sinus histiocytosis with massive lymphadenopathy is a lymphoproliferative pathology usually benign, of unknown etiology, and of low incidence. It is a rare, but well-defined clinicopathological entity, which predominantly affects children and adolescents without distinction of gender or race. It manifests itself generally by bulky cervical lymphadenopathies, most often bilateral, painless, of benign but persistent evolution and a long-term fever associated with a non-specific biological inflammatory syndrome. Extra lymph node locations are described in association with lymph node involvement or isolation. The definitive diagnosis of Rosai Dorfman’s disease is histological, characterized by histiocytic infiltration with emperipolesis essentially of lymphocytes. The etiopathogenesis of the condition remains unclear, based on infectious and immunological hypotheses without clear evidence. The management is not well codified, it combines depending on the case, surgery;corticosteroids;antimetabolites and interferon alpha. Studies devoted to this condition in tropical Africa are rare. We report the clinical and progressive features of 5 observations of Rosai Dorfman’s disease.

关键词： Rosai Dorfman Histiocytosis Dakar

Three Cases of Plasma Cell Leukemia

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Open Journal of Internal Medicine 2022年第3期12卷 137-144页

作者： Mouhamed Dieng Atoumane Faye Jules Dabi Gabnon Baïdy Sy Kane Maïmouna Sow Michel Assane Ndour Seynabou Fall Nafi Diagne Awa Cheikh Ndao Demba diedhiou Boundia Djiba Fatou Samba Ndiaye Maïmouna Ndour Mbaye Anna Sarr Awa Oumar Touré abdoulaye Pouye Division of Internal Medicine Aristide Le Dantec Hospital Dakar Senegal Division of Internal Medicine Abass Ndao Hospital Dakar Senegal Division of Clinical Hematology Dalal Jamm Hospital Dakar Senegal Division of Biological Hematology Aristide Le Dantec Hospital Dakar Senegal

Introduction: Plasma cell leukemia (PL) is a rare lymphoproliferative disorder characterized by the monoclonal proliferation of plasma cells in the marrow and blood peripheral. It is defined by a blood plasmacytosis greater than 2 G/l or a plasma cell level greater than 20% of leukocytes. It can be primitive or secondary to multiple myeloma (MM). We reported 3 cases of PL. Observations: Case 1: A 59 years old woman with fever, anemia with 7 g/dl, hyperleukocytosis 9200/mm3, thrombopenia 86 G/l inflammatory biological syndrome with CRP at 129 mg/l, hypercalcemia at 120 mg/l, renal failure with serum creatinine at 35 mg/l, urea at 0.85 g/l and 24-hour proteinuria at 0.98 g/24h. Β2 microglobulin at 10.34 mg/l. The blood smear shows dysmorphic plasma cells at 68% and the bone marrow at 79% of dysmorphic plasma cells. The immunophenotyping of blood cells, the electrophoretic serum protein, shows PL CD38+, secondary of a MM LAMBDA. Case 2: A 65-year-old man with type 2 diabetes presented, right femoral neck, anemia, hyperleukocytosis at 22 G/l, and thrombocytopenia at 99 G/l. There was no hypercalcemia, or kidney failure. The blood smear showed 28% of plasma cells and 9% of blasts. On the myelogram, the marrow was normal richness with significant medullary plasmacytosis (31%) made up of dysmorphic plasma cells. The CT scan showed a settling of the body of D5 with heterogeneous osteocondensation. The patient was transferred to hematology where she was treated with polychemotherapy. The evolution was unfavorable following a death due to malignant hypercalcemia. Case 3: A 62-year-old woman who had a 5-year follow-up of Ig G kappa multiple myeloma was treated with Melphalan, Prednisone, and thalidomide with a therapeutic break for 2 months. She came back to the Internal Medicine department with: severe global dehydration, anemia with externalized bleeding gingivorrhagia, pain in mechanical bones of the ribs, lower limbs, and pelvis, bilateral pneumonia. The biology

关键词： Plasma Cell Leukemia Multiple Myeloma