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Stability of a Delayed Stochastic Epidemic COVID-19 Model with Vaccination and with Differential Susceptibility

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Journal of Applied Mathematics and Physics 2024年第2期12卷 509-532页

作者： Modeste N’zi Boubacar Sidiki kouyaté Ilimidi Yattara Modibo Diarra Laboratory of Applied Mathematics and Computer Science University Felix Houphouet-Boigny Abidjan C&#244te d’Ivoire Department of Mathematics and Computer Science University of Science Technic and Technologies Bamako Mali

In this paper, we treat the spread of COVID-19 using a delayed stochastic SVIRS (Susceptible, Infected, Recovered, Susceptible) epidemic model with a general incidence rate and differential susceptibility. We start with a deterministic model, then add random perturbations on the contact rate using white noise to obtain a stochastic model. We first show that the delayed stochastic differential equation that describes the model has a unique global positive solution for any positive initial value. Under the condition R0 ≤ 1, we prove the almost sure asymptotic stability of the disease-free equilibrium of the model.

关键词： SIRS Delayed Epidemic Model Nonlinear Incidence rate Lyapunov Function Asymptotic Stability in Probability

Determination of the Electrical Parameters of a Solar Cell in Steady State

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Open Journal of Applied Sciences 2023年第10期13卷 1834-1843页

作者： Omar Diallo Sadio Mamadou kouyaté Papa Touty Traoré Fabé Idrissa Barro Department of Physics Semiconductors and Solar Energy Laboratory Faculty of Science and Technique Cheikh Anta Diop University Dakar Senegal

Photovoltaic solar energy can be obtained by using several types of technologies, including silicon solar cells. The characterization of its solar cells makes it possible to know them better. This article presents, on the one hand, the work that has been carried out on these cells. On the other hand, a theoretical study of the cell under illumination using Lambert’s W function. On the basis of the electrical parameters provided by the manufacturer, the parameters such as the series and shunt resistances and the electrical quantities such as the photocurrent and the photovoltage, are determined and studied according to the ideality factor of the diode. From the results obtained the shunt resistance increases when the ideality factor increases, the series resistance decreases very weakly.

关键词： Solar Cell Series Resistance Shunt Resistance Ideality Factor Lambert Function

Inhibition Performance of Some Sulfonylurea on Copper Corrosion in Nitric Acid Solution Evaluated Theoretically by DFT Calculations

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Open Journal of Physical Chemistry 2020年第3期10卷 139-157页

作者： Mougo André Tigori Amadou kouyaté Victorien Kouakou Paulin Marius Niamien Albert Trokourey UFR Environnement Université Jean Lorougnon Guédé Daloa C&#244 te d’Ivoire Laboratoire de Chimie Physique Université Félix Houphou&#235 t Boigny Abidjan C&#244 te d’Ivoire

The theoretical study of chlorpropamide, tolazamide and glipizide was carried out by the Density Functional Theory (DFT) at B3LYP/6-31G(d) level. This study made it possible to determine the global reactivity parameters in order to better understand the interactions between the molecules studied and the copper surface. Then, the determination of local reactivity indices (Fukui functions and dual descriptor) on these molecules resulted in the precision on the most probable centers of nucleophilic and electrophilic attacks within each molecule. The results obtained, show that chloropropamide, tolazamide and glipizide can be good inhibitors against copper corrosion. Thus, the mechanism of copper corrosion inhibition of these compounds in nitric acid solution has been explained by means of theoretical calculations.

关键词： Chlorpropamide Tolazamide Glipizide Density Functional Theory Copper Corrosion

Maxilla Voluminous Bone Sequesters: About 4 Clinical Cases Treated at CCTOS in CHU Cocody

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Open Journal of Stomatology 2021年第11期11卷 451-459页

作者： Patrice Attogbain Kouamé Daniel Amantchi Akpe Jonas Adou Wendpouiré Patrice Laurent Guiguimdé Vazoumana kouyaté Nguessan Koboh Atsé Department of Surgery Pathology and Therapeutics Anesthesiology Resuscitation Radiology UFR of Odonto-Stomatology Houphou&euml t-Boigny University of Abidjan Abidjan Ivory Coast Training and Research Unit in Health Sciences (UFR/SDS) Joseph Ki Zerbo University Ouagadougou Burkina Faso

Introduction: Jaw osteitis is an inflammatory disease of bone tissue causing aseptic necrosis of bone. This study aims to clarify the etiologies of osteitis of the jawbones and to describe the clinical and radiographic aspects of extensive forms. Cases Presentation: Our study concerns the clinical and radiographic examination of 4 cases of voluminous bone sequesters. The causes of osteitis are mainly infectious and due to late consultations of our populations. The development of these maxillary osteitis leads to the formation of large bone sequesters. Conclusion: The evolution towards voluminous sequesters is a combination of dental infection, poor oral hygiene, late consultation and traditional treatment.

关键词： Osteitis Sequesters Jawbones Late Consultation

Epidemiological and Histopathological Aspect of Precancerous and Cancerous Lesions of the Cervix in the Health District of Commune 5 of Bamako, the CHU of Point “G” and the Gabriel TouréUniversity Hospital of Bamako in Mali

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Journal of Cancer Therapy 2020年第9期11卷 561-570页

作者： Soumana Oumar Traoré Saleck Doumbia Cheickna Sylla Saoudatou Tall Ibrahima Tegueté Ichiaka Djibo Faissif kouyaté Issa Ongoiba Youssouf Traore Oumar moussokoro Traore Niani Mounkoro Mamadou Traore Faculty of Medicine and Odontostomatology University of Science and Technology Bamako Mali Department of Gynecology and Obstetrics Reference Health Centre of Commune V Bamako Mali Department of Obstetrics and Gynecology Koutiala Reference Health Centre Sikasso Mali Department of Gynecology and Obstetrics Gabriel Touré University Hospital Bamako Mali

Objective: The aim was to take stock of the screening and treatment of precancerous and cancerous lesions of the cervix in the health district of commune V of Bamako, the “G” point and the Gabriel Touré University Hospital in Bamako, Mali. Patients and Methods: This was a descriptive, cross-sectional, analytical study with retrospective and prospective data collection over an 8-year period from January 1, 2010 to December 31, 2017. This was a multi-center study. Results: From January 1, 2010 to December 31, 2017, 42,492 women were screened, representing a frequency of 24.30%. The median age of the women screened was 32 years;25% were under the age of 25. Three-fourth of the women screened was in the 20 - 49 age group. Of the 22,842 women screened, 90.1% of them had a normal col to IVA/IVL. However, 4.1% of cervical positivity had with acetic acid and 5.1% of positivity to Lugol. 0.7% of the women screened clinically had cancerous lesions. Histologically, 96.5% of the women screened had a normal cervix with benign lesions. For pathological histological findings, we noted 2.6% of precancerous lesions and 0.8% of squamous cell carcinomas and

关键词： Epidemiology Histology Precancerous and Cancerous Lesions of the Cervix

Assessing Levels and Health Risks of Fluoride and Heavy Metal Contamination in Drinking Water

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Journal of Geoscience and Environment Protection 2022年第11期10卷 15-34页

作者： Ali Sanou Namory Méité Amadou kouyaté Elisephane Irankunda Alfred Niamien Kouamé Aka Eric Koffi Koffi Jean-Paul Bohoussou Lébé Prisca M.-S. Kouakou Institut National Polytechnique Félix Houphouë t-Boigny (INP-HB) Laboratoire des Procédés Industriels de Synthèses de l’Environnement et des Energies Nouvelles (LAPISEN) Yamoussoukro C&#244 te d’Ivoire Institut National Polytechnique Félix Houphouë t-Boigny (INP-HB) Laboratoire de Thermodynamique Traitement et Sciences des Surfaces et Interfaces Ingénierie et Physicochimie des Procédés et de Mécanique des Matériaux (L2-TSIPM) Yamoussoukro C&#244 te d’Ivoire Ecole Normale Supérieure (ENS) Laboratoire des Sciences Physiques Fondamentales et Appliquées (LSPFA) Abidjan C&#244 te d’Ivoire Université Félix Houphouë t-Boigny (UFHB) UFR SSMT Laboratoire de Constitution et Réaction de la Matière (LCRM) Abidjan C&#244 te d’Ivoire Université Félix Houphouë t-Boigny (UFHB) UFR SSMT Laboratoire de Constitution et Réaction de la Matière (LCRM) Abidjan C&#244te d’Ivoire Laboratoire des Sciences et Technologies de l’Environnement UFR Environnement Université Jean Lorougnon Guédé Daloa C&#244 te d’Ivoire School of Computer Science and Information Technology The East African University Kajiado Kenya

A systematic study was carried out to assess the level of contamination with fluorides and heavy metals in the drinking water of the city of Daloa as well as the risks to the health of consumers. The waters of 11.11% of the sites sampled exceeded the fluoride limit for drinking water with a contamination index (CI) greater than 0. All the waters recorded concentrations of cadmium (Cd), copper (Cu), iron (Fe), manganese (Mn) and lead (Pb) above the recommended values with CI > 0. However, 22.22% of the sites recorded concentrations below the standard for zinc (Zn) with IC 1 for children in 22.22% of drinking water studied. HQs have an average of less than 1 for fluorine and greater than 1 for all metals. Moreover, the danger indices have values greater than 1. The incremental lifetime cancer risk (ILCR) and the total ILCR are above the recommended values. These results showed that the drinking water sampled is of poor quality due to higher levels of heavy metals, which can constitute a danger to human health. Long-term use of one of these poor quality waters can lead to cancer in consumers. It is therefore necessary to treat this water in order to eliminate the metals before using it for drinking. This study can help decision-makers and competent authorities in charge of water management.

关键词： Physico-Chemical Parameters Fluoride Heavy Metals Drinking Water Sanitary Risks

Frequency of Group A Beta-Hemolytic Streptococcal Angina in Children in the Department of Pediatrics of Donka National Hospital

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Open Journal of Pediatrics 2020年第4期10卷 610-616页

作者： Mamadou mous.apha Diop Aissata Barry Emmanuel Camara Mohamed Lamine Diallo M’mah Aminata Bangoura Hasmiou Dia Saliou Bella Diallo Mamadou Aliou Doukouré mous.apha kouyaté Narcisse Viani Gateu Tadjom Mamadou Pathé Diallo Pediatrics Department Donka National Hospital Conakry Republic of Guinea Paediatric Medical Emergency Donka National Hospital Conakry Republic of Guinea Institute of Nutrition and Child Health Conakry Republic of Guinea Paediatrics Department Ignace Deen National Hospital Conakry Republic of Guinea Medical Centre and Health Counselling Conakry Guinea

Background: Angina is a common paediatric condition. It has certain peculiarities in children, particularly with regard to the frequency of bacterial germs and the use of diagnostic tests. The aim of this study was to determine the place of the rapid diagnostic test in the management of group A beta-hemolytic streptococcal angina in children in the paediatric ward at Donka National Hospital. Methods: This was a prospective descriptive study lasting 6 months from 1st February to 31st July 2019 concerning children aged between 3 and 15 years old who were diagnosed with angina. Epidemiological, clinical, para-clinical and therapeutic variables were studied. Results: Out of 1494 registered children, we collected 116 cases of angina (7.76%). Out of 52 patients who benefited from the rapid diagnostic test, we recorded 13 cases of angina due to group A beta-hemolytic strptococcus. The male sex was the most dominant with 31 cases (59.69%) and a G/F sex ratio of 1.47. The age group most affected was between 3 and 5 years old (50%). The average age of ou

关键词： Angina Frequency Clinic Treatment Pediatrics Donka

Microbiological Assessment and Antimicrobials’ Use in an Infectious Diseases Department in Mali

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Advances in Microbiology 2021年第8期11卷 384-398页

作者： Mikaila Kaboré Issa Konaté Yacouba Cissoko Ibrehima Guindo Bintou Coulibaly Meli Hermine Aboubacar Alassane Oumar Mariam Soumaré Assetou Fofana Abdoulaye Zaré Mohamed Aly Cissé Dramane Sogoba Omar Magassouba Hama Hamidou Issa Fodé kouyaté Sounkalo Dao Infectious Diseases Department Point “G” University Teaching Hospital Bamako Mali Faculty of Medicine and Odontostomatology University of Sciences Techniques and Technologies of Bamako (USTTB) Bamako Mali Laboratory and Biomedical Research Department National Institute of Public Health Bamako Mali Faculty of Pharmacy University of Sciences Techniques and Technologies of Bamako (USTTB) Bamako Mali Laboratory of Biomedical Analysis University Teaching Hospital of Kati Kati Mali Serefo Program University of Sciences Techniques and Technologies of Bamako (USTTB) Bamako Mali

The use of antimicrobials without microbiological proof is frequent and contributes to the emergence of resistance. The aim was to identify the organisms isolated during laboratory examinations and the type of antimicrobials consumed by patients hospitalized to Infectious Diseases’ Clinic. This is a cross-sectional and analytical study, carried out from January 1 to December 31, 2017 in the Infectious Diseases Department of Point “G” Teaching Hospital in Mali. All biological specimens from patients during the study period were analyzed. In total, 322 patients benefited from microbiological test, with a mean age of 40.9 ± 12.2 years (range 15 and 74 years) with a sex ratio of 0.93. Only 5.6% of patients were HIV negative. In all participants, a total of 658 microbiological specimen were taken, 224 (34.0%) identified at least one pathogen including bacteria in more than a half of the cases (58.5%). On the report of bacteriological analysis, the most frequently identified organisms were Mycobacterium tuberculosis (42.2%) mainly in sputum;Escherichia coli (24.2%) and Klebsiella pneumoniae (7.8%) commonly in urine and Gardnerella vaginalis (7.0%) exclusively in vaginal secretions. Candida albicans (5/8) and Cryptococcus neoformans (3/8) were the most common fungi while Plasmodium falciparum (96.4%) represented the parasite frequently found in blood. From a therapeutic standpoint, 1143 antimicrobials were prescribed to 322 admitted patients, i.e. 3.55 anti-infectives per patient. Antibiotics (excluding tuberculosis drugs), antiparasitics and antifungals represented respectively 46.2%;18.8% and 15.1% of anti-infectives. Antibiotic therapy was effective in 274 (85.1%) patients and among them, only 76 (27.7%) cases were based on microbiological evidence. Antibiotics are the most widely used antimicrobials in an infectious disease department. Empiric treatments are common but must be minimized by the search for microbiol

关键词： Antimicrobial Microbiology Infectious Diseases Mali

Influence of Age on the Clinical and Prognostic Features of Tetanus in Mali

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International Journal of Clinical Medicine 2021年第3期12卷 77-86页

作者： Mikaï la Kaboré Issa Konaté Yacouba Cissoko Jean Paul Dembélé Mariam Soumaré Assetou Fofana Dramane Sogoba Oumar Magassouba Hermine Méli Abdoulaye Zaré Mohamed Aly Cissé Bintou Coulibaly Hama Hamidou Issa Fodé kouyaté Japhet Dembélé Sounkalo Dao Infectious Diseases Department Point “G” University Teaching Hospital Bamako Mali Faculty of Medicine and Odontostomatology University of Sciences Techniques and Technologies of Bamako (USTTB) Bamako Mali Serefo Program University of Sciences Techniques and Technologies of Bamako (USTTB) Bamako Mali

Background: The regression of post-vaccination immunity with age exposes elderly subjects to certain infectious diseases, in particular tetanus. The aim was to compare the clinical and prognostic features of tetanus according to the age of patients. Methodology: Analytical study of the files of patients hospitalized for tetanus in the Infectious Diseases Department at Point “G” University Teaching Hospital from 2013 to 2019 with retrospective collection. According to age, three groups of patients were formed: group I (Results: In total, 202 cases of tetanus were recorded or 7.3% of admissions. The mean age was 41.9 ± 15.6 years (range, 6 and 85 years) with a sex ratio of 19.2. According to the age grouping, group II was predominant (79.2%) followed by group III (14.9%) with respective mean ages of 39.2 ± 10.6 and 67.3 ± 6.5 and sex ratio of 39 and 29. Workers (33.3%), farmers (25.8%), traders (19.7%) and drivers (7.1%) represented the most important occupations most at risk. Clinically, bad general condition (p Conclusion: Tetanus is more prevalent in men. Complications and mortality increase with age. It is important to include booster immunization of adults in existing national programs in order to reduce disease-related morbidity and mortality in this age group.

关键词： Tetanus Elderly Clinical Prognosis Mali