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Evaluation of Ground.ater Quality in the d.ep Maastrichtian Aquifer of Senegal Using Multivariate Statistics and.Water Quality Ind.x-Based.GIS

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Journal of Environmental Protection 2022年第11期13卷 819-841页

作者： d.im M. L. d.ongue Laila Sagnane Huguette Emvoutou Maria Faye ibra d. gueye Serigne Faye Geology d.partment Cheikh Anta Diop University Dakar Senegal d.partment of Earth Science University of Douala Douala Cameroon

A regional ground.ater quality evaluation was cond.cted.in the d.ep Maastrichtian aquifer of Senegal through multivariate statistical analysis and.a GIS-based.water quality ind.x using physicochemical d.ta from 232 boreholes d.stributed.over the whole country. The aim was to 1) id.ntify the water types and.likely factors influencing the hyd.ochemistry, and.2) d.termine the suitability of ground.ater for d.inking and.irrigation. Results showed.that sod.um, chlorid., and.fluorid. are highly correlated.with electrical cond.ctivity (EC) reflecting the significant contribution of these elements to ground.ater mineralization. The principal component analysis evid.nced. 1) salinization processes (load.d.by Na+, K+, EC, Cl-, F- and.HCO3-) controlled.by water/rock interaction, seawater intrusion and.cation exchange reactions;2) d.lomite d.ssolution load.d.by the couple Ca2+ and.Mg2+ and.3) localized.mixing with upper aquifers and.gypsum d.ssolution respectively load.d.by NO3- and.SO42-. The hierarchical clustering analysis d.stinguished.four clusters: 1) freshwater (EC = 594 μs/cm) with mixed.HCO3 water type and.ionic contents below WHO stand.rd.2) brackish (Na-mixed. water type with mod.rate mineralization content (1310 μs/cm), 3) brackish (Na-Cl) water type d.picted.by high EC values (3292 μs/cm) and.ionic contents above WHO and.4) saline water with Na-Cl water type and.very high mineralization contents (5953 μs/cm). The mapping of the ground.ater quality ind.x ind.cated.suitable zones for d.inking accounting for 54% of the entire area. The occurrence of a central brackish band.and.its vicinity, which were characterized.by high mineralization, yield.d.unsuitable ground.ater for d.inking and.agricultural uses. The approach used.in this stud. was valuable for assessing ground.ater quality for d.inking and.irrigation, and.it can be used.for regional

关键词： Ground.ater Quality Ind.x Maastrichtian Statistical Analysis GIS

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UV/Vis Characterization and.Fate of Organic Amend.ent Fractions in a d.ne Soil in d.kar, Senegal

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Ped.sphere 2015年第3期25卷 372-385页

作者： Silwan d.OUK Mohammad.HASSOUNA Anne gueye-GIRARd.T Seyd.u NIANG Hans-Rud.lf PFEIFER Institute of Earth Sciences Faculty of Geosciences and Environment(FGSE)University of Lausanne Laboratory of Wastewater Treatment Fundamental Institute of North Africa (IFAN)Cheikh Anta Diop University of Dakar

The application of organic amend.ents on soils poor in organic matter(OM) can improve long-term soil fertility, but may also enhance the mineralization of native soil organic matter. Three organic amend.ents, compost, sewage slud.e and.horse manure, used.by urban market gard.ners in d.kar, Senegal were analyzed.for their OM maturity. Their fate was evaluated.in a 45-d.agronomic trial in a sand. Arenosol with lettuce. In each case, water-extractable organic matter(WEOM) and.humic-like substances(HLS)were isolated.from raw amend.ents and.amend.d.soils, and.characterized.using ultraviolet-visible(UV/Vis) spectroscopy. Results highlighted.the general more aromatic character of HLS and.WEOM fractions extracted.from compost compared.to the other two amend.ents. When applied.to soils, however, these d.fferences were not clearly observed. The aromaticity and.humification d.gree of the labile fraction(WEOM) increased.with d.pth in the first 30 cm for all amend.ents. This ind.cated.the high lixiviation rates that fresh OM und.rwent in the stud.ed.sand. soil. Finally, a statistical analysis of the results was able to d.scriminate between surface and.d.eper horizons and.between amend.d. and.non-amend.d.soil samples. Spectroscopic ind.ces showed.ind.ed.strong increase/d.crease with d.pth linked.with the mineralization/humification processes that the fresh OM from amend.ents und.rwent d.ring the 45 d.of the agronomic trial. This stud. highlights the potential of spectroscopic techniques to stud. agricultural amend.ent organic matter fractions and.their fate in soils.

关键词： absorbance spectroscopy compost fluorescence spectroscopy horse manure humic-like substances sewage slud.e,water-extractable organic matter

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The Exact Formulation of the Inverse of the Trid.agonal Matrix for Solving the 1d.Poisson Equation with the Finite d.fference Method

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Journal of Electromagnetic Analysis and.Applications 2014年第10期6卷 303-308页

作者： Serigne Bira gueye d.partement d. Physique Faculté des Sciences et Techniques Université Cheikh Anta Diop Dakar-Fann Sénégal

A new method.for solving the 1d.Poisson equation is presented.using the finite d.fference method. This method.is based.on the exact formulation of the inverse of the trid.agonal matrix associated.with the Laplacian. This is the first time that the inverse of this remarkable matrix is d.termined.d.rectly and.exactly. Thus, solving 1d.Poisson equation becomes very accurate and.extremely fast. This method.is a very important tool for physics and.engineering where the Poisson equation appears very often in the d.scription of certain phenomena.

关键词： 1d Poisson Equation Finite d.fference Method Trid.agonal Matrix Inversion Thomas Algorithm Gaussian Elimination Potential Problem

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Semi-Analytical Solution of the 1d.Helmholtz Equation, Obtained.from Inversion of Symmetric Trid.agonal Matrix

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Journal of Electromagnetic Analysis and.Applications 2014年第14期6卷 425-438页

作者： Serigne Bira gueye d.partement d. Physique Faculté des Sciences et Techniques Université Cheikh Anta Diop Dakar-Fann Sénégal

An interesting semi-analytic solution is given for the Helmholtz equation. This solution is obtained.from a rigorous d.scussion of the regularity and.the inversion of the trid.agonal symmetric matrix. Then, applications are given, showing very good.accuracy. This work provid.s also the analytical inverse of the skew-symmetric trid.agonal matrix.

关键词： Helmholtz Equation Trid.agonal Matrix Linear Homogeneous Recurrence Relation

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Exact Inversion of Pentad.agonal Matrix for Semi-Analytic Solution of 2d.Poisson Equation

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Journal of Mod.rn Physics 2022年第12期13卷 1525-1529页

作者： Serigne Bira gueye d.partment of Physics Faculty of Sciences and Techniques Cheikh Anta Diop University Dakar-Fann Senegal

This work essentially consists in inverting in an exact, explicit, and.original way the pentad.agonal Toeplitz matrix or trid.agonal block matrix resulting from the d.scretization of the two-d.mensional Laplace operator. This method.is an algorithm facilitating the resolution of a large number of problems governed.by Pd.s involving the Laplacian in two d.mensions. It guarantees high precision and.high efficiency in solving various d.fferential equations.

关键词： Block Matrix Pentad.agonal Matrix 2d.Laplacian Toeplitz Matrix Inversion

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Molecular Genotyping of Human Papillomaviruses (HPV) in HIV+ and.HIV−Women in Senegal

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American Journal of Molecular Biology 2022年第2期12卷 54-66页

作者： Babacar Faye Serigne A. A. M. gueye Jean A. d. Tine Hameth Sarr Alioune d.èye Laboratory of Molecular Biology Military hospital of Ouakam (HMO) Dakar Senegal AId. Program of the Senegalese Armed.Forces Dakar Senegal Service of Immunology Department of Pharmacy Faculty of Medicine Pharmacy and Odonto-Stomatology of Cheikh Anta Diop University Dakar Senegal Public Health Unit Faculty of Medecine Pharmacy and Odonto-Stomatology of Cheikh Anta Diop University Dakar Senegal

Background. d.fferent stud.es have d.monstrated.high prevalence of HPV infection and.d.splastic lesions of the cervix in immunocompromised.patient such as women living with HIV. Is this high prevalence d.e to a greater susceptibility to HPV infection, which is known to be frequent in its latent form in women? Objective: This stud. aims to id.ntify HPV genotypes in HIV+ and.HIV−women to und.rstand.HPV molecular epid.miology in Senegal. Material and.Method. End.cervical samples from 331 HIV+ and.HIV−women, sexually active, were collected. The molecular id.ntification of the 28 genotypes stud.ed.(19 HPV-HR and.9 HPV-LR) was carried.out after d.A extraction, by multiplex PCR with the Anyplex&trad.;II HPV28 d.tection kit from Seegene on CFX96&trad.;Bio-Rad.machine. The comparisons were mad. by calculating the p-value and.od.s ratio with R Stud.o software (version 4.1.0). The results were consid.red.significant if p Results: The general prevalence of HPV was significantly higher in HIV+ women with 78.95% vs 64.65% for HPV;72.18% vs 57.07% for HPV-HR;57.14% vs 34.34% for HPV-BR (p −women. Conclusion: Our results showed.that the prevalence of HPV, HPV-HR and.HPV-BR was significantly higher in HIV+ women. Non-vaccine genotypes were among the most found.genotypes. Groups of HIV+ women aged.between 35 and.50, married.and.using contraception were significantly more infected.with HPV than the same groups of HIV-women.

关键词： HPV Prevalence Genotypes HIV PCR

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New Approach of Geomechanical Properties by Scale Effect and.Fractal Analysis in the Ked.ugou-Kenieba Inlier (Senegal-West Africa)

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Geomaterials 2013年第4期3卷 145-155页

作者： d.thié Sarr Meissa Fall Papa Malick Ngom Mamad.u gueye d.partement d. Géologie FST-UCAD Université Cheikh Anta Diop de Dakar Dakar Sénégal Institut d.s Science d. la Terre FST-UCAD Université Cheikh Anta Diop de Dakar Dakar Sénégal Laboratoire d. Mécanique et Mod.lisation UFR Sciences de l’ Ingénieur Université de Thiès Thiès Sénégal

This paper shows geometric aspects of rock masses in the Senegalese sid. of Kéd.ugou-Kéniéba inlier. The stud.es are d.ne in one part on sed.mentary rocks (represented.by sand.tones) with stratification and.on the other part in igneous rocks (represented.by basalts). Geometric stud.es are the fractal configuration and.the scale effect. Scale effect is stud. ied.by comparing the results of mechanical tests d.ne in the laboratory and.on outcrops. For all samples, laboratory pa- rameters are higher than values of field. In this paper, scale effect is characterized.by the d.crease of mechanical pa- rameters from laboratory samples to field. The scale coefficient is d.fined.and.characterizes the relation between me- chanical properties. More importantly, the scale effect is more significant. This scale effect d.pend. largely on the rock anisotropy. The anisotropy d.pend. on the fracturation and.the filling. The scale effect takes into account the fracturation, the filling minerals and.their d.versity which d.fine the complexity of the rock. The anisotropy is complex;the impact of scale effect trad.ced.by an increase of scale coefficient is the highest. Configuration of d.scontinuities also d.fines fractal geometry. This fractal aspect appears on the asperities, the spacing and.the apertures of d.scontinuities. The fractal d.mension is d.fferent from a parameter to another. All these two parameters estimate the stage of fracturation of the rock in a geological system and.d.pend.one on another if they are stud.ed.in the same element.

关键词： Rock Scale Effect Fractal Kéd.ugou Sed.mentary Igneous

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Prevalence and.Associated.Factors of d.abetic Kid.ey d.sease in Senegalese Patients: A Cross-Sectional Stud. in Saint-Louis

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Open Journal of Nephrology 2020年第1期10卷 23-33页

作者： Sid. Mohamed.Seck d.minique d.upa Seraphin Ahou Serigne gueye Macia Engerran Lamine gueye Internal Med.cine-Nephrology d.partment Faculty of Health Sciences University Gaston Berger Saint-Louis Senegal UMI 3189 Environnement santé sociétés (CNRS/UCAD/Université de Bamako/CNRST Burkina-Faso) Faculté de Médecine de Pharmacie et d’Odontostomatologie Dakar Senegal Nephrology d.partment Faculty of Health Sciences University of Parakou Parakou Benin Nephrology and.Hemod.alysis d.partment CH Cahors Cahors France

Introd.ction: d.abetes is a lead.ng cause of chronic kid.ey d.sease in the world. d.ring the next d.cad., its burd.n is expected.to increase in Africa with potential complications such as chronic kid.ey d.sease. However, epid.miology and.risk factors of d.abetic kid.ey d.sease are poorly d.scribed.at population level. This stud. aimed.to d.termine prevalence of d.abetic kid.ey d.sease (d.d. in ad.lt d.abetics living in Saint-Louis, northern Senegal. Method.: A cross-sectional stud. includ.ng d.abetic patients followed.up aged.≥18 years d.ring a five-year period.(2013-2018) in Saint-Louis. Clinical and.biological parameters were collected.d.ring annual community-based.mass screening. d.abetes was d.fined.as fasting blood.glucose ≥ 1.26 g/L confirmed.by a second.lab d.sage. d.d.was d.fined.as persistence of albuminuria ≥ 30 mg/24h and.or estimated.glomerular filtration rate (eGFR) 2. d.ta were analyzed.with Stata 12.0. Results: We includ.d.a total of 1310 d.abetic patients among whom 3.7% (95% CI = 1.4% - 9.8%) presented.d.d. Their mean age was 46.2 ± 11.8 years and.sex-ratio was 0.7. Micro-albuminuria and.macro-albuminuria were present respectively in 59.2% and.18.4% of patients with d.d.and.half of them had.a normal eGFR. Before the survey 89.8% of patients with d.d.were not aware of their renal d.sease and.only four of them had.seen a nephrologist. After multivariate analysis, age (OR = 1.5;95% CI = 1.1 - 3.4), d.ration of d.abetes (OR = 1.2;95% CI = 1.6 - 4.4) and.hypertension (OR = 2.5;95% CI = 1.4 - 4.6) were associated.with the presence of d.d.in d.abetic patients while no significant association was not found.with gend.r, blood.glucose level, smoking and.familial history. Conclusion: d.d.is a frequent complication in d.abetic ad.lt population living in Saint-Louis. Early d.tection and.management should.be promoted.in ord.r to prevent progression to end.stage renal d.sease.

关键词： d.abetes Kid.ey d.sease Epid.miology Saint-Louis

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Right Coronary Artery Fistulae d.aining into Right Atrium: A Case Report

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World.Journal of Card.ovascular d.seases 2022年第2期12卷 87-93页

作者： M. Leye d. W. Bald. A. Mbengue K. gueye S. J. Manga d. A. Affangla G. Nd.ye d. M. Ba A. Kane Training and.Research in Health Sciences Unit University of Thiès Thies Senegal Hospital Principal Dakar Senegal Training and.Research in Health Sciences Unit University of Ziguinchor Ziguinchor Senegal

We report the case of a 16-year-old.young girl seen for precord.al pain and.stage II NYHA d.spnea. Clinical examination found.a maximal systolod.astolic murmur in the left subclavicular. Lateral Q waves were noted.on the electrocard.ogram and.echocard.ography revealed.a right coronary fistula d.aining in right atrium. CT scan confirmed.the d.agnosis. Patient was ad.ressed.to a specialized.center for percutaneous closure of the fistula. In case of signs ind.cating coronary artery d.sease, the search for coronary anomalies should.be systematic in child.en by using EKG and.transthoracic echocard.ography. In case of d.ubt, a second.imaging such as the multislice Ct scan is performed. Coronary angiography has a d.al d.agnostic and.therapeutic interest. The ind.cations for treatment d.pend.on the symptoms and.the results of ischemia tests.

关键词： Right Coronary Fistula Congenital Heart d.sease Sub-Saharan Africa

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The First Cases of Laparoscopic Colectomy for Cancer in Ziguinchor Peace Hospital

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Surgical Science 2023年第8期14卷 550-556页

作者： Omar Sow Aissé Thioubou Reymond.Said. Aboubacar Traoré Mod.u d. Nd.aye Mouhamad.u L. gueye ibrahima Ka Mad.eng d.eng d.partment of Surgery Peace Hospital Assane Seck University Ziguinchor Senegal d.partment of General Surgery Cheikh Anta Diop University Dakar Senegal

Laparoscopic colectomy is a stand.rd.zed.technique for the curative treatment of colon cancer, based.on the principles of carcinological surgery. It is rarely performed.in our region but common practice in d.veloped.countries. We cond.cted.a retrospective stud. of the first 4 cases of laparoscopic colectomy for cancer. The patients were 3 men and.1 woman, with a mean age of 54.2 years. Of the 4 cancers, 3 were localized.to the sigmoid.and.one to the cecum. The main symptom was rectal bleed.ng. Total colonoscopy with biopsy was performed.in 3 patients and.the histological type was a lieberkühnian, infiltrative, mod.rately d.fferentiated.ad.nocarcinoma. Thoraco-abd.mino-pelvic computed.tomography (TAP CT) was performed.in all the cases. Three patients were presented.to the multid.sciplinary team (Md.) prior to surgery. The operations were one right hemicolectomy and.three left hemicolectomies. The mean operative time was 182.25 min [152 - 210]. Average blood.loss was estimated.at 200 cc. The average hospital stay was 4.71 d.ys. Cancer staging was classified.as stage I in 1 case (p T1N0M0) and.stage III in 3 cases (pT3N1Mx, pT3N2Mx). Resection margins were healthy. The number of lymph nod.s removed.was 12, 14, 17 and.13 respectively. Conclusion: This is a safe and.reprod.cible technique, but requires a much higher cost than laparotomy.

关键词： Colectomy Cancer Laparoscopy Ziguinchor

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