Characterization of natural and chemically modified kaolinite from Mako (Senegal) to remove lead from aqueous solutions

The chemical and sorption properties of clay minerals from the Mako area, Senegal, were investigated using FTIR spectroscopy, X-ray diffraction, scanning electron microscopy equipped with an X-ray energy dispersion spectrometer, thermal analysis and chemical analysis. The clay sample is essentially dominated by kaolinite and quartz as also shown by treatment with ethylene glycol and dimethylsulfoxide (DMSO). The clay fraction of this natural clay was organically modified by grafting with 3-aminopropyltriethoxysilane (APTES) in order to improve significantly its retention ability of heavy metals. The silane groups of the APTES reagent were partly grafted on the surface of platy kaolinite particles and the remaining ethoxy groups could be hydrolysed by aqueous treatment. The natural clay, its clay fraction and the organo-functionalized clay (with APTES) were investigated as adsorbents for the removal of Pb(II) from aqueous solutions. Evidence for an organic grafting has been demonstrated by comparing the spectroscopic characteristics of the natural clay and those of its chemically modified derivatives. The effects of different parameters (i.e. initial Pb(II) concentration and contact time) on the adsorption efficiency were studied. For an initial concentration of 10 mg L–1 Pb(II), the adsorption was maximized after 30 min contact time both for the raw material and its clay fraction and after 90 min for the APTES grafted clay. Although the maximum of sorption for the APTES grafted clay is reached with slower kinetics, this maximum amount of Pb(II) uptake at room temperature (X max) is significantly higher since it is 0.99 mg g–1 for the raw clay, 1.46 mg g–1 for its clay fraction and 3.02 mg g–1 for the organically modified clay, i.e. three times greater than the raw clay

Determination of Marine Biotoxins Contamination Level of Mussel (Perna Perna) (Linne, 1758) from the Mamelles Bay, Dakar

This study evaluating marine biotoxins contamination level of mussel (Perna Perna) in the Mamelles Bay (Ouakam) of Dakar is the first report in Senegal. It took place over one year (from March 2018 to February 2019). Liquid chromatography with mass spectrometry (LC-MS-MS) reference method (Regulation (EC) 15/2011 of 10 January 2011) was used to quantify marine biotoxins. Okadaic acid (OA) and its esters are the most problematic of all the researched biotoxins. They are present throughout most of the year, except September and November, with an average monthly concentration of 163 µg/kg, slightly above the regulatory limit (160 µg/kg). The sanitary status of the mussel shows two peaks of contamination, the first of which occurs in the rainy season (August) and the second in the cold season (December), with values equal to 654 and 802 µg/kg respectively 4 to 5 times higher than the regulatory threshold set by Regulation (EC) No 853/2004 of 29 April 2004 supplemented by Regulation (EU) No 786/2013 amending its Annex III and Senegalese Order No 07951 of 12 May 2017. These two peaks coincide with (i) the wintering period, marked by continental land-based inputs due to rainwater runoff, but also with the temperature rise, or (ii) the cold period with the appearance of upwelling (upwelling of cold water, rich in nutrient salts). In addition to the chemical analyses carried out on the mussel, the research work on phytoplankton and the surveys of physicochemical parameters carried out on the water at the collection site show (i) the existence of toxic algae of the Dinophysis genus and Gambierdiscus, in June, i.e., one to two months before the first peak of contamination of the Perna perna by AO; (ii) also a coincidence between the appearance of these phenomena and variations in surface water temperature and salinity, which are determining factors in the appearance and development of harmful algal blooms. Concerning the other biotoxins investigated, in particular AZA and yessotoxins, it was noted that AZA was absent throughout the year, unlike yessotoxins, which were found in the flesh of Perna perna at concentrations below the regulatory limit set at 3750 µg/kg. The maximum being 51 µg/kg obtained in June, i.e., 73 times lower than the regulatory threshold. In the light of the results obtained, it appears that the periods of high contamination are the winter period and the upwelling period, which could lead to closure measures to guarantee the safety of the mussels. It would be interesting to extend the study to all other bivalve mollusks and gastropods, to carry out an inventory and quantify the toxic microalgae present in the water. To this end, the effectiveness of purification techniques would be tested. Keywords: Mussel (Perna perna), Marine biotoxins, Toxic microalgae, Mamelles, Dakar. DOI: 10.7176/FSQM/117-04 Publication date:July 31st 202

Right-heart infective endocarditis: apropos of 10 cases

The prevalence and characteristics of right heart endocarditis in Africa are not well known. The aim of this study was to describe the epidemiological, clinical and laboratory profiles of patients with right-heart infective endocarditis. This was a 10-year retrospective study conducted in 2 cardiology departments in Dakar, Senegal. All patients who met the diagnosis of right heart infective endocarditis according to the Duke's criteria were included. We studied the epidemiological, clinical as well as their laboratory profiles. There were 10 cases of right-heart infective endocarditis representing 3.04% of cases of infective endocarditis. There was a valvulopathy in 3 patients, an atrial septal defect in 1 patient, parturiency in 2 patients and the presence of a pacemaker in one patient. Anaemia was present in 9 patients whilst leukocytosis in 6 patients. The port of entry was found to be oral in three cases, ENT in one case and urogenital in two cases. Apart from one patient with vegetations in the tricuspid and pulmonary valves, the rest had localized vegetation only at the tricuspid valve. However, blood culture was positive in only three patients. There was a favorable outcome after antibiotic treatment in 4 patients with others having complications; three cases of renal impairment, two cases of heart failure and one case of pulmonary embolism. There was one mortality. Right heart infective endocarditis is rare but associated with potentially fatal complications.Pan African Medical Journal 2015; 2

Mineralogical and physico-chemical characterizations of clay from Keur Saër (Senegal)

There is interest in exploiting and developing natural resources, particularly deposits of natural clays. Senegal has several clay mineral deposits for which chemical and mineralogical compositions have been little studied. Some of these natural materials are nowadays used in pottery and ceramics. To extend applications, a better basic knowledge is required and, for this objective, the raw clay and separated <2 μm clay fraction from Keur Saër (Senegal) were subjected to chemical and mineralogical studies. Several techniques including X-ray diffraction (XRD), thermal analysis (TG-DTA), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), N2 adsorption-desorption isotherms, cation exchange capacity (CEC) measurements and solid state nuclear magnetic resonance (NMR) have been used to characterize the material. It was found that the raw clay and the separated clay fraction consist of a mineral mixture in which kaolinite is the main component. 29Si and 27Al MAS-NMR spectra show the presence of silicon atoms linked to three other silicon atoms via an oxygen atom and six coordinated Al atoms. Significant increases in the specific surface area and cation exchange capacity were observed on purification, reaching a maximum of about 73.2 m2g–1 and 9.5 meq/100 g for the separated fine clay fraction while the values for the raw material were around 28.9 m2g–1 and 7.3 meq/100 g

Profil De L’asthmatique Admis Au Centre Hospitalier National Universitaire De Fann (CHNU) A Dakar (Senegal)

Au Sénégal, la prévalence de l’asthme n’est pas encore évaluée. Les caractéristiques sociodémographiques, épidémiologiques et la provenance des patients asthmatiques consultés au Centre Hospitalier National Universitaire (CHNU) de Fann demeurent peu connues. Cet article contribue à la connaissance du profil des patients asthmatiques admis au CHNU. Il s’est agi d’une étude rétrospective, prospective et transversale à avisée analytique associant l’approche quantitative et qualitative qui s’est déroulée de janvier 1999 à août 2017 à la clinique de pneumologie du CHNU. La population d’étude était constituée des asthmatiques reçus en consultation. Les paramètres analysés concernent les caractéristiques de la population étudiée (âge, sexe, profession et statut matrimonial). Au total 296 patients asthmatiques, soit 36,5% d’hommes contre 63,5% de femmes, ont été enregistrés avec un âge médian qui était de 35 ans. 234 répondants à la variable catégorie socioprofessionnelle, étaient composés de ménagères (24,8%), d’élèves et d’étudiants (20,1%), de commerçants (17,5%), de bureaucrates (6,8%), de personnel de santé (6%) et d’enseignants et de maîtres coraniques (3,8%). A cela s’ajoutait, des ouvriers (3,8%), des couturiers (3,4%), des coiffeurs (3%), des chauffeurs (2,6%), des agriculteurs et éleveurs (2,6%), des mécaniciens et garagistes (1,3%), des pêcheurs et marins (1,3%), des restaurateurs et restauratrices (1,3%) et d’autres (1,7%). Selon le statut matrimonial, 54,3% étaient des mariés, 42,7% de célibataires et 3% de divorcés. Parmi les 296 asthmatiques, 250 résidaient en milieu urbain dakarois. Les antécédents se résumaient sur les signes et les symptômes des patients avec de la toux (34%), de la dyspnée expiratoire nocturne (34%), des expectorations nummulaires (18%) et des crises d’asthme (14%). Le profil des patients asthmatiques présente une population jeune avec une prédominance féminine. In Senegal, the prevalence of asthma has not yet been assessed. The socio-demographic, epidemiological and provenance characteristics of asthmatic patients consulted at the National Hospital University Center (CHNU) remain little known. This article contributes to the knowledge of the profile of asthmatic patients admitted to the CHNU. This was a retrospective, prospective and cross-sectional, analytical wise study combining the quantitative and qualitative approach which took place from January 1999 to august 2017 at the CHNU pulmonology clinic. The study of asthmatics received in consultation. The parameters analyzed relate to the characteristics of the population studied (age, sex, profession and marital status). A total of 296 asthmatic patients, or 36.5% male versus 63.5% female, were registered with a median age of 35 years. 234 respondents to the socio-professional category variable, were made up of housewives (24.8%), pupils and students (20.1%), traders (17.5%), bureaucrats (6.8%), health personnel (6%) and koranic teachers and teachers (3.8%). In addition, workers (3.8%), dressmakers (3.4%), hairdressers (3%), drivers (2.6%), farmers and ranchers (2.6%), mechanics and mechanics (1.3%), fishermen and sailors (1.3%), restaurateurs and restorers (1.3%), and others (1.7%). According to marital status, 54.3% were married, 42.7% were single and 3% were divorced. Among the 296 asthmatics, 250 resided in an urban Dakar environment. The history was summarized by the signs and symptoms of patients with cough (34%), nocturnal expiratory dyspnea (34%), sputum (18%) and asthma attacks (14%). The profile of asthmatic patients presents a young population with a female predominance

Unruptured tubal pregnancy in the second trimester

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Aspects épidémiologiques, pronostiques et thérapeutiques de l’hématome retro placentaire (HRP) dans une maternité de référence en zone rurale

Introduction: IL s'agira ici d' identifier les particularités diagnostiques et la prise en charge de l'HRP au Centre Hospitalier de Ndioum au Sénégal.Méthodes: Etude rétrospective descriptive menée à l'hôpital régional de Ndioum, durant la période allant du 1er Janvier 2009 au 31 Décembre 2011. Toutes les patientes qui avaient présenté un HRP étaient  incluses. Pour chaque patiente, nous avions étudié les paramètres sociodémographiques et cliniques, les données thérapeutiques et le pronostic materno-foetal. Résultats: La fréquence était de 6,05%. L'âge moyen de nos patientes était compris entre 29 et 84 ans  et la parité moyenne de 4,92. Aucune consultation prénatale n'était effectuée chez 16 % des patientes. Les évacuations représentaient 66% de cas. L'âge gestationnel moyen était de 36 semaines  d'aménorrhées et la majorité des patientes (86%) était en travail. La gravite du tableau clinique était appréciée selon la classification de Sher avec 63% (114 cas) au grade 3. Une coagulopathie était observée chez 27,2% des patientes. Nous avions retrouvé une relation statistiquement significative entre la  gravite du tableau clinique et le pronostic maternel (p=0,026) et foetal (p=0,0000). Une direction du travail était effectuée chez 109 patientes (60% des cas). L'expulsion foetale était obtenue par voie basse dans 49% des cas et une césarienne était effectuée dans 51 % des cas. La morbidité maternelle était dominée par l'anémie secondaire à une hémorragie aigue dans 17,8% des cas et à l'insuffisance rénale aigue dans 6,1% des cas. Les éléments de mauvais pronostic étaient représentés par la gravité du tableau clinique (p=0,03) et le mode d'admission dominé par les évacuations (p=0,01), la relation était statistiquement significative. La voie d'accouchement n'était pas retrouvée comme élément de mauvais pronostic (p=0,09). Nous avions noté douze cas de décès maternels soit 6,6% des patientes.Conclusion: La prévention de la mortalité maternelle et foetale liée à cette affection passe par une  amélioration du suivi prénatal, une meilleure organisation du plan d'accouchement et une améliorationdes conditions d'évacuation. La mise en place d'une banque de sang fonctionnel, d'une unité réanimation médicale ainsi qu'un service de prise en charge néonatale devient une nécessité pour améliorer le pronostic maternel et néonatal.Key words: Hématome rétro placentaire, mortalité maternelle, mortalité périnatal

Effets des pratiques biopesticides sur l’entomofaune et la production de tomate (Solanum lycopersicum) dans la station expérimentale de l’ISAE (Dakar-Sénégal)

In Senegal, the tomato represents 22.5% of the overall vegetable production estimated at 70,000 tons and is the second most important vegetable crop. However, its production is exposed to many constraints, including the threat of insects. To face the problems posed by these pests, it is necessary to implement effective control methods, capable of reducing the pest population to a tolerable economic threshold. For this reason, this study was conducted in the experimental field of application and incubator of ISAE at UCAD in 2021 in order to test the effectiveness of biological controls on insect pests and tomato yield. A Fisher experimental set-up consisting of three (3) blocks divided into nine (9) plots was installed. The results of this study show that the number of insects is significantly higher (14.7) in untreated plants. On the other hand, the incidence of insects is significantly lower (8.08) with plants treated with Capscicum annum than with plants treated with Azadirachta indica (8.5). Key words: Azadirachta indica, Capscicum annum, incidence, Production, pest, TomatoAu Sénégal, la tomate représente 22,5 % de la production globale de légumes estimée à 710 000 tonnes et occupe la deuxième place des cultures maraichères. Cependant, sa production est exposée à de nombreuses contraintes dont la menace des insectes. Pour faire face aux problèmes posés par ces déprédateurs, il est nécessaire de mettre en œuvre des méthodes de lutte efficaces, capables de réduire la population des ravageurs à un seuil économique tolérable. C’est pour cela que cette étude a été réalisée dans le champ d’expérimentation d’application et incubateur de l’ISAE à l’UCAD en 2021 dans le but de tester l’efficacité des luttes biologiques sur les insectes ravageurs et sur le rendement de la tomate. Un dispositif expérimental de Fisher constitué en trois (3) blocs repartis en neuf (9) placettes a été installé. Les résultats de cette étude montrent que le nombre d’insectes est significativement plus élevé (14,7) sur les plantes non traitées. Par contre, l’incidence des insectes est significativement plus faible (8,08) avec les plantes traitées avec le Capscicum annum qu’avec les plantes traitées à l’Azadirachta indica (8,5). Mots clés&nbsp;: Azadirachta indica, Capscicum annum, incidence, Production, ravageur, Tomat

Dyslipidemia, obesity and other cardiovascular risk factors in the adult population in Senegal

Introduction: According to the WHO, 50% of deaths worldwide (40.1% in developing countries) are due to chronic non-communicable diseases (NCDs). Of these chronic NCDs, cardiovascular diseases remain the leading cause of death and disability in developed countries. The Framingham study has shown the importance of hypercholesterolemia as a primary risk factor. In Senegal, the epidemiology of  dyslipidemia and obesity are still poorly understood due to the lack of comprehensive studies on their  impact on the general population. This motivated this study to look into the key epidemiologic and socio-demographic determinants of these risk factors. Methods: It was a cross-sectional descriptive epidemiological survey which included 1037 individuals selected by cluster sampling. Data were collected using a questionnaire following the WHO STEPwise approach. Socio-demographic, health and biomedical variables were collected. P value Results: The average age was 48 years with a female predominance (M: F of 0.6). The literacy rate was 65.2% and 44.7% of participants were from rural areas. The prevalence of hypercholesterolemia, hyperLDLemia, hypoHDLemia, hypertriglyceridemia and mixed hyperlipidemia were 56%, 22.5%, 12.4%, 7.11% and 1.9% respectively. One in four was obese (BMI&gt; 30kg/m2) and 34.8% had abdominal obesity. The main factors significantly associated with dyslipidemia were obesity, urban dwelling, physical inactivity and a family history of dyslipidemia. Conclusion: The prevalence of dyslipidemia, obesity and other risk factors in the population was high needing immediate care for those affected and implementation of prevention strategies.Key words: Dyslipidemia, obesity, cardiovascular, risk factors, Saint Loui