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Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry traces the geographical source of Biomphalaria pfeifferi and Bulinus forskali,involved in schistosomiasis transmission

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Infectious Diseases of Poverty 2024年第1期13卷 98-99页

作者： Papa Mouhamadou Gaye ei hadj ibrahima ndiaye Souleymane Doucoure Doudou Sow Mapenda Gaye Ndiaw Goumballa Carole Cassagne Coralie L'Ollivier Oleg Medianikov Cheikh Sokhna Stephane Ranque Aix-Marseille University IRD AP-HM SSA VITROME Marseille France VITROME International IRD-UCAD Campus Dakar Senegal Hospital-University Institut (IHU) Mediterranée Infection Marseille France Departement of Animal Biology Faculty of Sciences and Techniques UCAD Dakar Senegal Department of Parasitology-Mycology UFR Sciences de la Santé Université Gaston Berger Saint-Louis Senegal

Background Freshwater snails of the genera Bulinus spp.,Biomphalaria spp.,and Oncomelania *** the main intermediate hosts of human and animal *** of these snails has long been based on mor-phological and/or genomic criteria,which have their *** limitations include a lack of precision for the morphological tool and cost and time for the DNA-based ***,Matrix-Assisted Laser Desorp-tion/lonization Time-Of-Flight(MALDI-TOF)mass spectrometry,a new tool used which is routinely in clinical microbi-ology,has emerged in the field of malacology for the identification of freshwater *** study aimed to evaluate the ability of MALDI-TOF MS to identify Biomphalaria pfeifferi and Bulinus forskali snail populations according to their *** This study was conducted on 101 *** and 81 *** snails collected in three distinct geo-graphical areas of Senegal(the North-East,South-East and central part of the country),and supplemented with wild and laboratory *** which had previously been morphologically described were identified by MALDl-TOF MS[identification log score values(LSV)≥1.7],after an initial blind test using the pre-existing *** DNA-based identification,new reference spectra of ***(n=10)and ***(n=5)from the geographical areas were added to the MALDI-TOF spectral *** final blind test against this updated database was per-formed to assess identification at the geographic source *** MALDI-TOF MS correctly identified 92.1%of 101 *** snails and 98.8%of 81 *** *** the final blind test,88%of 166 specimens were correctly identified according to both their species and sampling site,with LSVs ranging from 1.74 to *** geographical source was adequately identified in 90.1%of 91 *** and 85.3%of 75 *** *** Our findings demonstrate that MALDI-TOF MS can identify and differe

关键词： Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry Snail Intermediate host Biomphalaria pfeifferi Bulinus forskali Schistosomiasis Senegal

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Prevalence and Associated Factors of Postpartum Depression: A Study Conducted in Health Centres in Dakar (Senegal)

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Open Journal of Psychiatry 2024年第1期14卷 45-66页

作者： Sokhna Seck Momar Camara Racky Wade Kane Djeynaba Bassine Baldé El hadj Makhtar Bâ Adama Koundoul Idrissa Bâ ibrahima ndiaye Papa Lamine Faye Aida Sylla Service de psychiatrie Centre Hospitalier National Universitaire de Fann Dakar Sénégal

Introduction: Postpartum depression is the most common psychiatric disorder affecting women in the perinatal period. According to the WHO, it affects 10% - 15% of women who have just given birth. In Africa, and particularly in Senegal, epidemiological studies focusing exclusively on postpartum depression are rare or non-existent. For this reason, we conducted this screening study on postpartum depression to assess the socio-demographic characteristics and associated factors. Methods: This was a prospective cross- sectional study with descriptive and analytical aims. It was carried out in the twelve Dakar referral health centres during the period August 2021 to June 2022. Results: At the end of our survey we had recruited one hundred and twenty-two (122) participants with a PPD prevalence rate of 25.41%. The most common age group was 24 - 29 years. 40% of the participants were of Fulani ethnicity, followed by Wolof. Married women made up 93% of the sample. The school enrolment rate was 89%. Most participants were not in paid employment. Domestic violence was present in 14% of couples. 28% of mothers reported experiencing a stressful life event during their pregnancy. 22% of the women had a chronic medical condition, of which 55% had high blood pressure. 1% of the women reported a personal psychiatric history and 5% a family psychiatric history. Most women had between two and four healthy living children. The pregnancy was unwanted in 17% of cases and 12% of participants had a complication. 6% were dissatisfied with the quality of their antenatal care. The caesarean section rate was 18%. In terms of associated factors, eight factors were identified in a bivariate analysis: single marital status, lack of support from partner, domestic violence, conflict with in-laws, and the occurrence of a stressful life event during pregnancy, the presence of a personal medical history, lack of satisfaction with pregnancy follow-up, and mode of delivery by caesarean section. Conclusi

关键词： Postpartum Depression Prevalence Associated Factors Senegal

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Back Surface Recombination Velocity Dependent of Absorption Coefficient as Applied to Determine Base Optimum Thickness of an n+/p/p+ Silicon Solar Cell

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Energy and Power Engineering 2020年第7期12卷 445-458页

作者： Meimouna Mint Sidi Dede Mamadou Lamine Ba Mamour Amadou Ba Mor ndiaye Sega Gueye El hadj Sow ibrahima Diatta Masse Samba Diop Mamadou Wade Gregoire Sissoko Laboratory of Semiconductors and Solar Energy Physics Department Faculty of Science and Technology University Cheikh Anta Diop Dakar Senegal Ecole Polytechnique de Thiès (EPT) Thiès Senegal

The monochromatic absorption coefficient of silicon, inducing the light penetration depth into the base of the solar cell, is used to determine the optimum thickness necessary for the production of a large photocurrent. The absorption-generation-diffusion and recombination (bulk and surface) phenomena are taken into account in the excess minority carrier continuity equation. The solution of this equation gives the photocurrent according to absorption and electronic parameters. Then from the obtained short circuit photocurrent expression, excess minority carrier back surface recombination velocity is determined, function of the monochromatic absorption coefficient at a given wavelength. This latter plotted versus base thickness yields the optimum thickness of an n+-p-p+ solar cell, for each wavelength, which is in the range close to the energy band gap of the silicon material. This study provides a tool for improvement solar cell manufacture processes, through the mathematical relationship obtained from the thickness limit according to the absorption coefficient that allows base width optimization.

关键词： Silicon Solar Cell Absorption Coefficient Back Surface Recombination Optimum Thickness

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Correlation between Glomerulopathy and Retinopathy in an African Population of Type 2 Diabetics

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Journal of Diabetes Mellitus 2020年第2期10卷 64-72页

作者： Michel Assane Ndour Jean Pierre Diagne Demba Diedhiou Djiby Sow Esperance Ciss ibrahima Mane Diallo Muriel Diembou El hadj Fary Ka Papa Amadou ndiaye Anna Sarr Maimouna Ndour Mbaye Department of Internal Medicine Abass Ndao Hospital Center Dakar Sénégal Department of Ophtalmology Abass Ndao Hospital Center Dakar Sénégal Department of Nephrology Aristide Le DantecHospital Center Dakar Sénégal

Introduction: Diabetic microangiopathies are common, but their time to onset in a diabetic patient varies from subject to subject. The aim of our study was to study the correlation between renal and ophthalmic disorders in patients with type 2 diabetes. Patients and methods: This longitudinal, analytical study took place from March 1, 2018 to March 31, 2019 at the Abass Ndao University Hospital Center. It was studying retinal involvement in diabetic patients with glomerulopathy. Results: Of the 100 cases of diabetic glomerulopathy, they are divided into 70 women and 30 men with an average age of 58.2 years. The average duration of diabetes was 6.1 years and their average glycated hemoglobin (HbA1c) was 8.1%. Only 37% of patients had an HbA1c level below 7%. The other cardiovascular risk factors were high blood pressure (HBP) (39%), dyslipidemia (36%), and obesity (15%). Among these patients, diabetic retinopathy was present in 21% of the cases. Retinopathies were more frequent in the group of patients diagnosed with diabetes for less than 6 years (69%) and in patients with chronic renal disease with slightly reduced glomerular filtration rate (GFR) (34%). Conclusion: Our study allowed us to conclude that during the course of type 2 diabetes, the onset of chronic kidney disease does not systematically imply the presence of diabetic retinopathy. It is thus important to make screenings and assessments of systematic complications.

关键词： Diabetic Retinopathy Diabetic Nephropathy Microangiopathy Daka

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Profile of Autoimmune Polyendocrinopathies at the Medical Clinic II of the Abass Ndao Hospital: About 40 Cases

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Open Journal of Internal Medicine 2024年第1期14卷 74-82页

作者： Michel Assane Ndour Djiby Sow Mouhamed Dieng ibrahima Mané Diallo Boundia Djiba Mélaine Honorine Olympio Julie Borges Preira Muriel Diembou Fatou Kiné Gadji Fama ndiaye El hadj Mamadou Moussa Thioye Charles Halim Demba Diédhiou Anna Sarr Maïmouna Ndour Mbaye Abass Ndao Hospital Internal Medicine Department Cheikh Anta Diop University Dakar Senegal Aristide Le Dantec Hospital Internal Medicine Department Cheikh Anta Diop University Dakar Senegal

Introduction: Autoimmune polyendocrinopathies (AP) represent a group of rare concomitant pathologies, making them underdiagnosed. The objective was to study their profile at the Medical Clinic II of the Abass Ndao Hospital. Patients and Methods: This was an observational, descriptive and analytical study, lasting 24 months, from January 1, 2020 to December 31, 2022. We assessed the epidemiological, clinical and paraclinical characteristics of the patients and classified the APs found. Results: We included 40 patients divided into type III (38 cases) and IV (2 cases). A female predominance was noted with a sex ratio of 0.21. The mean age was 38.6 years. A family history of component diseases of autoimmune polyendocrine syndrome (APS) was found in 62.5%. Goiter (80%) was the main clinical sign present. All 38 patients with ISAP-3 had autoimmune thyroiditis, including 29 cases of Graves’ disease (72.5%) and 9 cases of Hashimoto’s thyroiditis (22.5%). They were associated with either type 1 diabetes (57.9%), Biermer’s disease (21.1%), vitiligo + alopecia (18.4%), lupus (2.6%). The 2 patients with AP-4 had Biermer’s disease associated with either Addison’s disease or type 1 diabetes. Management depended on the pathologies present and their possible complications. The immunological phenomena were also controlled. Conclusion: This series is globally similar to the literature. The polymorphous character of the clinical pictures requires a better collaboration between specialists leading to a clinical and holistic synthesis.

关键词： APS Biermer Graves’ Disease Hashimoto’s Addison’s Vitiligo Senegal

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Profile of Female Hyperandrogenism at the Medical Clinic II: About 19 Cases

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Open Journal of Endocrine and Metabolic Diseases 2023年第5期13卷 63-74页

作者： Michel Assane Ndour Demba Diédhiou Djiby Sow ibrahima Mané Diallo Mouhamed Dieng Fatou Gueye Astou Mbodj Julie Borges Preira Fatou Kiné Gadji Muriel Diembou Fama ndiaye El hadj Mouhamadou Moustapha Thioye Charles Halim Anna Sarr Maïmouna Ndour Mbaye Internal Medicine Department Abass Ndao Hospital Cheikh Anta Diop University of Dakar Dakar Senegal

Introduction: Female hyperandrogenism is essentially manifested by hirsutism. It is present in Senegal but not yet elucidated for lack of data. This is why we proposed to study the profile of hyperandrogenism in our context. Patients and Methods: This was an observational, cross-sectional cohort study of 19 patients of reproductive age followed for hyperandrogenism at the Medical Clinic II of Abass Ndao Hospital, from November 1st, 2019 to August 31st, 2021. Results: Our cohort consisted of women with an average age of 25.3 years, single (73.7%), with a low socioeconomic level (42.1%). A family history of hirsutism was found in 31.6% of cases. The main reasons for consultation were a menstrual cycle disorder in 94.7% of cases, and hirsutism in 78.9% of cases. The latter was post-pubertal (66.7%), with a slow or progressive evolution. The physical examination revealed: hirsutism (100%) with an average modified Ferriman Gallwey score (mFG) of 8.9 ± 5.8, acne (36.8%), hyperseborrhea (57.9%), major signs of virilization (10.5%), acanthosis nigricans (47.4%) and galactorrhea (5.3%). Hormonal explorations revealed an elevation of: testosterone (31.6%), 17-hydroxyprogesterone (5.3%), dihydrotestosterone (31.6%), and prolactin (10.5%). The ovarian morphology was micropolycystic (84.2%). The etiological profile corresponded to polycystic ovarian syndrome or PCOS (68.4%), ovarian hyperthecosis (10.5%), hyperprolactinemia (10.5%), congenital adrenal hyperplasia or CAH (5.3%). Idiopathic hirsutism was found in 5.3% of cases. Conclusion: Female hyperandrogenism is a less frequent reason for consultation in endocrinology. It deserves to be further evaluated in a large-scale study focused on epidemiological, clinico-biological and etiological investigation, in order to assess its prevalence and better define its profile in our context.

关键词： Female Hyperandrogenism Hirsutism Senegal

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Prolactin Adenomas in Senegal: Epidemiological, Diagnostic and Therapeutic Aspects of 89 Cases

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Open Journal of Internal Medicine 2023年第3期13卷 209-217页

作者： Michel Assane Ndour Demba Diédhiou Djiby Sow Boundia Djiba Mouhamed Dieng ibrahima Mané Diallo Fatou Kiné Gadji Julie Borges Muriel Diembou Fama Mody ndiaye El hadj Mouhamadou Moustapha Thioye Charles Halim Philippe Moreira Anna Sarr Maïmouna Ndour Mbaye Medical Clinic II Abass Ndao Hospital Center Cheikh Anta Diop University Dakar Senegal

Introduction: In Senegal, there is very little data on prolactinomas despite their negative impact on couples fertility. Patients and methods: This was a multicentre, retrospective, descriptive, analytical study conducted from 1 January 2008 to 31 December 2022 in the neurosurgery departments of the Fann and Principal hospitals and the endocrinology department of the Abass Ndao Hospital. Results: We included 89 patients, representing a prevalence of 36.7% among all cases of pituitary adenoma. The mean age was 35.6 ± 10 years and the sex ratio was 0.34. The mean time to consultation was 27.1 ± 29 months. Clinical symptoms were dominated by gonadotropic disorders represented by galactorrhoea (71 cases, 79.8%), amenorrhoea (61 cases, 68.5%), and infertility in the couple (31 cases, 34.8%). Fifty-seven (58) patients presented with a tumour syndrome (65.2%, including 57 cases of headache (64%), 34 cases of visual disorders (38.2%) and 8 patients with a dysmorphic syndrome (8.9%). Imaging revealed a macroadenoma in 68.5% (61 cases) and extension of the adenoma in 11 patients (12.4%). The hormonal profile was isolated lactotropic hypersecretion (80 cases, 89.9%) and mixed in 9 cases (including concomitant secretion of GH in 8 cases and ACTH in 1 case). All patients had initially benefited? from dopaminergic agonist-based medical treatment. Pituitary surgery was effective in 45 patients (50.6%), including 44 cases by transsphenoidal approach. Postoperative incidents included transient diabetes insipidus (77.7%) and cerebrospinal fluid leakage (20%). We noted 7 cases (7.9%) of death presenting with a tumour syndrome (100%), a macro-adenoma (85.7%), having undergone pituitary surgery (42.9%). The factors significantly associated with prolactinoma were young age (p Conclusion: This series also demonstrates the impact of prolactin adenomas on reproductive function. Delayed diagnosis explains the predominance of macroadenomas, which are a source of pre- and post-operative compli

关键词： Prolactinoma Fertility Disorders Tumour Syndrome Pituitary Adenomas

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Effects of Prandtl and Jacob Numbers and Dimensionless Thermal Conductivity on Velocity Profiles in Media (Porous and Liquid)

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Journal of Modern Physics 2024年第10期15卷 1603-1614页

作者： Momath ndiaye Madialène Sene Goumbo ndiaye Department of Hydraulics Rural Engineering Machinery and Renewable Energy UFR Fundamental and Engineering Sciences University of Sine Saloum El Hadj Ibrahima NIASS Kaolack Senegal

In this present study, we analyzed the effects of Prandtl and Jacob numbers and dimensionless thermal conductivity on the velocity profiles in media (porous and liquid). The transfers in the porous medium and the liquid film are described respectively by the improved Wooding model and the classical boundary layer equations. The mesh of the digital domain is considered uniform in the transverse and longitudinal directions. The advection and diffusion terms are discretized with a back-centered and centered scheme respectively. The coupled systems of algebraic equations thus obtained are solved numerically using an iterative line-by-line relaxation method of the Gauss-Seidel type. The results show that the parameters relating to the thermal problem (the dimensionless thermal conductivity, the Prandtl (Pr) and Jacob (Ja) numbers) have no influence on the dimensionless speed, although the thermal and hydrodynamic problems are coupled. Via the heat balance equation. The results obtained show that the parameters relating to the thermal problem have no influence on the dimensionless speed, although the thermal and hydrodynamic problems are coupled via the heat balance equation. So, at first approximation with the chosen constants, we can solve the hydrodynamic problem independently of the thermal problem.

关键词： Condensation Implicit Finite Difference Thin Film Porous Material Model Wooding Vertical Wall

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Numerical Study of Thin Film Condensation in Forced Convection of Saturated Vapor on a Vertical Wall Covered with a Porous Material

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Journal of Electronics Cooling and Thermal Control 2022年第1期11卷 1-12页

作者： Momath ndiaye Goumbo ndiaye Madialène Sene Fluid Mechanics and Applications Laboratory Hydraulics Rural Engineering Machinery and Renewable Energies Department Train-ing and Research Unit Sine Saloum El Hadj Ibrahima NIASS University Kaolack Senegal Civil Engineer Sen’eau Dakar Senegal

The study of forced convection in a porous medium has aroused and still arouses today the interest of many scientists and industrialists. A considerable amount of work has been undertaken following the discovery of the phenomenon. Solving a standard problem of forced convection in porous media comes down to predicting the temperature and velocity fields as well as the intensity of the flow as a function of the various parameters of the problem. A numerical study of the condensation in forced convection of a pure and saturated vapor on a vertical wall covered with a porous material is presented. The transfers in the porous medium and the liquid film are described respectively by the Darcy-Brinkman model and the classical boundary layer equations. The dimensionless equations are solved by an implicit finite difference method and the iterative Gauss-Seidel method. Our study makes it possible to examine and highlight the role of parameters such as: the Froude number and the thickness of the porous layer on the speed and the temperature in the porous medium. Given the objective of our study, the presentation of velocity and temperature profiles is limited in the porous medium. The results show that the Froude number does not influence the thermal field. The temperature increases with an increase in the thickness of the dimensionless porous layer. The decrease in the Froude number leads to an increase in the hydrodynamic field.

关键词： Condensation Implicit Finite Differences Thin Film Porous Material Darcy-Brinkman Model Vertical Wall

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Primary Hyperparathyroidia at the Abass Ndao Hospital Center: About 29 Cases

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Open Journal of Internal Medicine 2023年第4期13卷 427-435页

作者： Demba Diédhiou Michel Assane Ndour Mouhamed Dieng Charles Halim ibrahima Mané Diallo Djiby Sow Fatou Kiné Gadji Ndeye Déthié Beye Fama Mody ndiaye El hadj M. M. Thioye Boundia Djiba Boucar Ndong Awa Cheikh Ndao Anna Sarr Maïmouna Ndour Mbaye Service de Médecine Interne Centre Hospitalier Abass Ndao Université Cheikh Anta Diop Dakar Sénégal Service de Médecine Nucléaire et de Biophysique Faculté de Médecine Pharmacie et d’Odontologie Université Cheikh Anta Diop Dakar Sénégal Service de Médecine Interne Centre Hospitalier Aristide Le Dantec Université Cheikh Anta Diop Dakar Sénégal

Introduction: In Senegal, there is very little data on primary hyperparathyroidism despite an overall upward epidemiological trend. The objective was to describe its epidemiological, clinical, therapeutic and evolutionary aspects. Materials and Methods: This was a cross-sectional, descriptive study, conducted over 5 years (from January 01, 2018 to December 31, 2022) at the National Abass Ndao Hospital Center and including all confirmed cases of primary hyperparathyroidism. Results: Twenty-nine patients were included with a female predominance (86.20%) and an average age of 48.10 ± 18.93 years. The discovery of hyperparathyroidism was fortuitous in 79.31% of cases. The main clinical manifestations were osteoarticular (62%) and urinary (34.5%). On average, serum calcium measured was 109.2 ± 7.92 mg/l, corrected serum calcium 111.3 ± 6.25 mg/l, urinary calcium 421.9 ± 96.45 mg/24h and parathormone at 145 ± 159.71 pg/ml. Among the patients, 25 had hypercalcemia (86.2%) and all had 24-hour hypercalciuria. The diagnosis was retained in view of the elevated parathyroid hormone (PTH) values in all patients. Cervical ultrasound objectified a parathyroid adenoma in 27.58% of cases and 12 patients or 46.2% had presented a scintigraphy in favor of a parathyroid adenoma. We found 01 cases of multiple endocrine neoplasia type 2. Bone densitometry performed in 10 patients found osteoporosis in 60% of cases (6 patients) and osteopenia in 40% of cases (4 patients). Surgical treatment was performed in 12 patients (41.4%). The histology of the surgical specimens was in favor of a parathyroid adenoma in all cases. Among the operated patients, the evolution was marked by a cure rate of 100%. Conclusion: The symptomatology of primary hyperparathyroidism remains mainly osteoarticular and urinary. Surgery has proven its effectiveness in our series. We insist on the systematic dosage of calcemia especially in women over 50 years and the promotion of morphological explorations.

关键词： Primary Hyperparathyroidism Hypercalcemia Parathormone Osteoporosis Dakar

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