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Physico-Chemical and Mineralogical Characterization of Two Clay Materials of the Far North Region of Cameroon(Makabaye,Maroua)

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Advances in Materials Physics and Chemistry 2018年第9期8卷 378-386页

作者： Etienne Yanne amadou amadou oumarou Bup Divine Nde Raidandi Danwe Ecole Nationale Superieure Polytechnique de Maroua MarouaCameroun Faculte des Sciences Universite de Yaounde IYaoundeCameroun College of Technology The University of BamendaBamendaCameroon

To contribute to the valorization of local materials, the physico-chemical and mineralogical characterization of two clay materials MJ and MN collected in the Mayo Tsanaga river which crosses the Makabaye district of Maroua (Cameroon) was carried out. For this purpose, various methods of characterization have been used, namely granulometric analysis, Atterberg limits, X-ray fluorescence spectrometry and X-ray diffraction. It is apparent from the granulometry that the clay materials studied titrate 33.77% of clays for MJ against 44.13% for MN. The plasticity indices Ip with values IpMJ = 19.27% and IpMN = 23.4% place the materials in the plastic domain and offer them the possibility to being shaped into objects. The chemical composition of the MJ and MN materials reveals that the silicon oxide SiO2, the aluminumoxide Al2O3 and iron oxide Fe2O3 are their main constituents. The X-ray diffraction of the MJ and MN materials shows that they consist mainly of quartz with associated kaolinite, illite, montmorillonite, perlialite, dickite, nacrite, amesite, albite, brookite and anorthite. In addition to these, 2/1 minerals such as muscovite, nontronite, glauconite, and phlogopite are also identified in the MJ material. The peaks of sanidine, microcline and gismondine are also found in the MN material. The materials being rich in clay minerals 2/1 can be valorized in the adsorption and the absorption of the oils and greases and in the waterproofing of the grounds. The presence of quartz, kaolinite and illite is undoubtedly favorable for the manufacture of ceramic products in terracotta. These products will be obtained at a relatively lower temperature due to illite, feldspars and iron minerals that provide vitrification during firing by forming eutectics. The aluminosilicate amorphous phases contained in the studied materials can be exploited to produce geopolymer cements and concretes.

关键词： Characterization Physico-Chemical Mineralogical Clay Materials Mayo Tsanaga Maroua-Cameroon

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Wasteland and Empty Plots Trivialization in the Maradi City (Niger): Between Environmental Degradation and Consequent Nuisance, Quality of life and Sustainability of Biodiversity

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Occupational Diseases and Environmental Medicine 2022年第1期10卷 13-34页

作者： Karimou Dia Hantchi oumarou Zango amadou oumarou Boubé Morou Moussa Konaté Department of Geology Faculty of Science and Techniques Dan Dicko Dankoulodo University Maradi Niger Department of Chemical and Biological Sciences Faculty of Science and Techniques University of Zinder Zinder Niger Department of Medicine Faculty of Health Science Dan Dicko Dankoulodo University Maradi Niger Department of Biology Faculty of Science and Techniques Dan Dicko Dankoulodo University Maradi Niger Department of Geology Faculty of Science and Techniques Abdou Moumouni University Niamey Niger

The trivialization of empty spaces has long been practiced in the city of Maradi (Niger), particularly in the Zaria 2 (Commune II) and Ali Dan Sofo (Commune III) districts. With stalls in the streets and illegal dumping grounds, empty plots and the surrounding areas are fairly privileged sources of various wastes. This study aims at analyzing the impact of these empty plots on the local population, through several aspects, especially in terms of the modes of occupation, internal and surrounding practices, physical environment and biodiversity, sanitation and elimination of waste. To do so, two methodological approaches were used: a survey on local population and in situ observation of these spaces. The results not only reveal a difficult proximity situation to the unbuilt but also showed that empty plots constitute not only a form of vegetation conservation for the future as well as clean surfaces which would be called upon to characterize the potential recharge of groundwater. The most potentially useful organic waste would be that of Kadro, especially feathers from poultry that could be used as compost in the fields. In addition to the degradation of urban environments (63% of respondents), the unbuilt area also contributes to poverty reduction and increases food security (69% of respondents). To reduce the negative impacts, the rewarding strategies would be awareness-raising and monitoring measures coupled with a policy of protection and environmental remedies.

关键词： Urban Environment Empty Plots Biodiversity Waste Impacts Maradi Niger

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Pathological and Etiological Aspects of Nephrotic Syndrome at the Niamey General Reference Hospital

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Open Journal of Nephrology 2024年第3期14卷 340-349页

作者： Djibrilla Gani Salamatou amadou Niaouro oumarou Ali Diallo Nephrology-Dialysis Department Niamey General Reference Hospital Niamey Niger Environmental Health and Climate Epidemiology Unit (UESEC)-CERMES Niamey Niger

Introduction: Studies have been conducted on nephrotic syndrome in Niger. The study aimed to determine the histological and etiological aspects of nephrotic syndrome. Patients and Method: This was a retrospective study from February 1st, 2018 to January 31st, 2024. All patients with nephrotic syndrome who underwent renal biopsy were included. Samples were analyzed at the anatomy-cytology pathology laboratory of the Faculty of Medicine in Dakar (Senegal). The variables studied included clinical, biological, histological and etiological characteristics. Data were analyzed using Excel 2013 and Epi-info 7.2.0 software. Results: The study included 119 patients with nephrotic syndrome. Prevalence of nephrotic syndrome was 11.24%. The male-to-female ratio was 2.25:1. The mean age at diagnosis was between 34.5 ± 18.84 years. Edema was the reason for admission in 40.34% of cases. The nephrotic syndrome was impure in 63.86% of cases. Nine histological lesions were identified. Focal and segmental glomerulosclerosis (40.09%), minimal change disease (23.53%), membranous nephropathy (13.45%), diabetic nephropathy (10.92%), membranous proliferative glomerulonephritis (3.36%), acute glomerulonephritis (3.36%), glomerular thrombotic microangiopathy (2.52%), non-IgA mesengial proliferative glomerulonephritis (1.68%) and amyloidosis (0.84%). Nephrotic syndrome was primary in 57.98% of cases. Secondary etiologies were dominated by diabetes (11.76%), followed by hepatitis B virus (9.24%), lupus, lymphoma, malaria, syphilis, cryoglobulinemia, sickle cell disease and HIV. Conclusion: Future studies should investigate the causes of glomerulopathy secondary to chronic tubulointerstitial lesions.

关键词： Nephrotic Syndrome Anatomopathology Niamey General Reference Hospital

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Effect of the Orientation on the Comfort of a Building Made with Compressed Earth Block

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Smart Grid and Renewable Energy 2021年第7期12卷 99-112页

作者： Fati amadou oumarou Adama Ouedraogo Sikoudouin Maurice Thierry Ky Ramchandra Bhandari amadou Konfe Ramatou Konate Rabani Adamou Dieudonné Joseph Bathiebo Sié Kam Laboratory of Renewable Thermal Energies University Joseph KI-ZERBO: UFR/SEA Ouagadougou Burkina Faso Faculty of Science and Technologies Department of Chemistry University Abdou Moumouni Niamey Niger Centre Universitaire Polytechnique de Kaya (CUP-Kaya) University Joseph KI-ZERBO Ouagadougou Burkina Faso Institute for Technology and Resources Management in the Tropics and Subtropics: ITT Cologne Germany

Thermal comfort is one of the most important requirements that scientists and building designers must meet to ensure the indoor air quality knowing its importance on productivity and the health of occupants. However, it has never been of great concern for architects and architectural historians and seldom explores it. Buildings are the large consumer of the most energy consumption (around 40% worldwide) and generate around 35% of GHGs like CO2 that leads to extreme climate change. Hence, general and specific eco-friendly solutions in the field of building construction are required. Analysis of this study shows that air conditioning consumption can be significantly reduced thanks to the compressed earth bricks and by taking into account the climate and the orientation of the facades. However, this paper establishes viable low-cost option of building energy consumption while maintaining the thermal comfort and good indoor air quality. This work explains the effect of a single residential room orientation, by reducing the thermal amplitude, and improving the thermal phase shift in Ouagadougou climate conditions in April. Internal temperature was modelled with 8 cardinal orientations. The result corresponds to a decrease of thermal amplitude damping greater than 4°C between East-West and North-South sides and, with a thermal phase shift of 4 hours 30 minutes between the Nord and West walls.

关键词： Thermal Comfort Building Optimal Orientation Thermal Amplitude Thermal Phase Shift Energy Consumption Optimal Orientation

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Cervical Myelopathy: Diagnostic Aspects, Surgical Treatment and Evolution of Patients Operated upon in Yaounde

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Open Journal of Modern Neurosurgery 2024年第1期14卷 72-82页

作者： Bello Figuim Djoubairou Ben Ousmanou oumarou Haman Nassourou Ndome Toto Orlande amadou Tidjani Djientcheu Vincent de Paul Yaounde Central Hospital Faculty of Medicine and Biomedical Sciences of the University of Yaounde 1 Yaounde Cameroon Yaounde Military Hospital Faculty of Medicine and Pharmaceutical Sciences of the University of Douala Douala Cameroon Douala General Hospital Faculty of Medicine and Pharmaceutical Sciences of the University of Douala Douala Cameroon Higher Institute of Health Sciences Université des Montagnes Bangangté Cameroon

Introduction: Although cervical myelopathy is the most common degenerative cervical spine pathology in adults, the indications and approaches of surgical treatment have not yet been clearly defined in the literature. Very few studies exist regarding these aspects in our setting, and they are mostly outdated. This study aimed to describe the diagnostic aspects, current surgical treatment with technical improvements, and progression in patients. Patients and Methods: We conducted a multicentre retrospective descriptive study over a 10-year period between January 2011 and January 2020 in three referral centres in Yaoundé. All patients who underwent surgery for cervical myelopathy were included. Results: Fifty-two patients were recruited. The rate of operated cervical myelopathies among all degenerative spinal pathologies was 14.05%. The M/F sex ratio was 3/1, and the average age was 52 ± 10 years. All included patients had gait problems, 90.38% demonstrated motor deficiency, and 67.30% experienced at least three levels of compression. Surgery was decided based on the Nurick grade;a posterior approach was applied to 86.54% of patients. Postoperative progression showed a neurological improvement of 82% with an average follow-up of 4 years. Conclusion: In this study, the patients who underwent surgery were relatively young, their clinical presentations were mostly advanced, and surgical management showed good results in well-selected cases.

关键词： Cervical Myelopathy Diagnosis Treatment Evolution Cameroon

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Obstetric Fistula: Epidemiological, Social and Therapeutic Aspects: Prospective Study of 196 Patients Admitted to the ZINDER Mother and Child Health Centre (CSME)

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Open Journal of Urology 2024年第2期14卷 95-103页

作者： Maazou Halidou Ousmane Manzo Zalika Lankoande Abdoulaye Kodo Harissou Adamou oumarou Habou Abdoulaye Idrissa Tassiou Ibrahim Nafiou Idi Soumana amadou Department of Surgery University André Salifou Zinder Niger National Reference Center for Genital Fistulas Care Niamey Niger

Introduction: Obstetric fistula (OF) is an abnormal communication between the genital and urinary tracts and/or associated with a recto-vaginal communication resulting from prolonged dystocic delivery. It is a frequent pathology in underdeveloped countries. In Zinder no study has been carried out on obstetric fistula. The aim of this study was to evaluate the epidemiological, social impact and therapeutic aspects of obstetric fistula at the CSME of Zinder. Patient and Method: This was a descriptive cross-sectional study of obstetric fistula care at CSME during the period of (January 2018 to June 2020). Results: A total of 196 cases were collected over 30 months. This represents an annual incidence of 78.4 fistulas. The median age of the patients was 18.63 years, and more than 65% were over 20 years old. One hundred and ninety-one patients (97.45%) did not attend school, and 56.12% (n = 110) lived in polygamous households. One hundred and fifty-one women (n = 151), 77.04% had full assistance from their husband during the first four (4) months of the pathology. Twenty-four (12.24%) had been notified of repudiation. Obstetrical risk of dystocia was found in 39.79% (n = 78) of the patients, of whom 24.49% (n = 48) had a focused antenatal consultation (CPNR). The labour lasted more than 24 hours in 100%. The majority of women are multiparous and 60% had at least 2 pregnancies. vesicovaginal fistula is the main pathological type with 86.23%. Fistulas were closed in 83.16% and 68.87% exited without urine loss. Conclusion: Obstetric fistula is a devastating disease affecting girls and young women in Niger, as in other countries in Africa and Asia. It is a major concern worldwide and is a social tragedy because it is disabling and depressing.

关键词： Obstetric Fistula Epidemiology CSME Zinder

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Analysis of Maternal Mortality at the Maradi Maternal and Child Health Center/Niger: About 379 Cases

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Open Journal of Obstetrics and Gynecology 2024年第9期14卷 1529-1539页

作者： amadou Issa Abdou Oumara Maina Lankoandé Salifou Zélika Tamo Kailou Azize Moussa Boukari Soumana Diaouga Hamadou oumarou Garba Souleymane Hassane Rabiatou Nayama Madi Mother and Child Health Center Dan Dicko Dankoulodo University of Maradi Maradi Niger Faculty of Health Sciences General Reference Hospital Abdou Moumouni University of Niamey Niamey Niger Mother and Child Health Center Andr Salifou University of Zinder Zinder Niger Issaka Gazobi Maternity of Niamey Faculty of Health Sciences Abdou Moumouni University of Niamey Niamey Niger

Introduction: Pregnancy, childbirth, and their consequences continue to be the leading cause of death, illness, and disability among women of reproductive age in developing countries. In Niger, maternal deaths account for about 39% of all deaths of women aged 15-49. Our aim was to identify the factors linked to maternal mortality in order to contribute to its reduction. Method: this is a descriptive retrospective study of 379 cases of maternal deaths collected at the Maradi CSME from January 1, 2018, to December 31, ***: Our study’s maternal mortality ratio is 2645.72 per 100,000 live births. The mean age of our patients was 27.46 years, with extremes ranging from 15 to 47 years. The 20-24 age group was the most represented, with 88 cases (23.2%). Housewives were 361 (95.3%), and 334 patients (88.1%) were uneducated. There were 261 of them from rural areas, i.e. 69%. The mean parity in our study was 3.46, with extremes ranging from 0 to 15. Multiparous patients 117 cases (30.9%) represented the most significant proportion. Only 42 patients (11.08%) had performed four or more antenatal consultations. Direct obstetric causes accounted for 56.73% of the causes of maternal death. Anemia was the leading cause of maternal death (31.66%). Nearly half of the patients had died before 24 hours after admission, i.e. 49.86%. Conclusion: Maternal mortality remains a significant challenge for developing countries, given its magnitude and timid decline. The fight to reduce maternal mortality must be the priority of our countries’ health policies.

关键词： Maternal Mortality CSME Maradi Anemia

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Oesophageal Mycosis: Epidemiological and Clinical Aspects and Risk Factors for Occurrence in the Digestive Endoscopy Unit of the Donka National Hospital, Conakry CHU

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Open Journal of Gastroenterology 2024年第2期14卷 31-40页

作者： Diallo Mamadou Sarifou Youssouf oumarou Yaogo Abdoulatif Diallo Kadiatou Diallo Djéinabou Wann Thierno amadou Bah Mamadou Lamine Yaya Diakhaby Mamadou Kanté Mamadou Aliou Sylla Djibril Hepato-Gastroenterology Department of the Donka National Hospital Conakry Guinea Faculty of Health Sciences and Techniques Gamal Abdel Nasser University Conakry Guinea Centre Hospitalier Universitaire Communautaire de Bangui Internal Medicine Department Bangui République Centrafricaine Hepato-Gastroenterology Department Angré University Hospital Abidjan Ivory Coast Department of Internal Medicine Donka National Hospital Conakry Guinea

Introduction: Oesophageal mycosis (OM) is one of the most common opportunistic infections in patients infected with HIV (Human Immunodeficiency Virus). However, this condition is increasingly observed in immunocompetent subjects. The aim of this study was to determine the endoscopic prevalence, clinical characteristics and risk factors for the occurrence of oesophageal mycosis in our department. Patients and Method: This was a prospective cross-sectional study of all patients who underwent oeso-gastroduodenal fibroscopy during the period from 1st January to 31st December 2022, i.e. one year, at the digestive endoscopy unit of the hepato-gastroenterology department of the Donka CHU national hospital in Conakry. All patients found to have oesophageal mycosis by FOGD were included. The endoscopy was performed using appropriate equipment: A Fujinon 4400 video endoscopy column;Three Fujinon EG 590 video gastroscopes;A hoover;Data were collected using a pre-established survey form and analysed using Epi info software version 6.0.4;Pearson’s Chi2 test as a test of independence and the exact 5% threshold ficher test. Results: Out of 1343 upper gastrointestinal endoscopies performed, 107 cases of oesophageal mycosis were found, representing a prevalence of 7.96%. The mean age was 40 years, with a male predominance of 55.42%. The sex ratio M/F was 1.24. The 45 and over age group was the most affected, with a prevalence of 40.43%, followed by the [35 - 45] age group, with a prevalence of 22.43%. Clinical symptoms were dominated by epigastralgia in 74.76% of cases, followed by odynophagia in 37.38% of cases, nausea and vomiting in 28.03% of cases, and pyrosis in 26.16% of cases. Oesophageal mycosis without oesophagitis was the most common endoscopic finding in 70% of cases. The main associated endoscopic lesions were erythemato-erosive and congestive gastropathy in 28.03% of cases, peptic oesophagitis (9.34%) and gastric ulcer (5.60%). The main risk factor

关键词： Endoscopy CHU Conakry Risk Factors Immunosuppression Oesophageal Mycosis

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Acute Leukemia in Niger: Epidemiological, Diagnostic and Therapeutic Aspects

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Open Journal of Blood Diseases 2024年第3期14卷 81-90页

作者： amadou Djibrilla-Almoustapha Badé Malam-Abdou Abdourahamane Yacouba Moussa Souley Moustapha Maman Brah Moustapha Elhadji-Chefou Boubacar Marou-Soumana Samaila Aboubacar Ousseini Fanta Maman Rabiou Badé oumarou Adamou-Chaibou Department of Hematology-Oncology National Hospital of Niamey Niamey Niger Faculty of Health Sciences University of Abdou Moumouni Niamey Niger Department of Medicine Zinder Hospital Regional Niger Departtment of Biology Amirou Boubacar Diallo National Hospital Niamey Niger Faculty of Health Sciences University of Dan Dicko Dankouloudo of Maradi Maradi Niger Laboratory of Biology National Hospital of Niamey Niamey Niger

Objective: Improve the care of patients followed for acute leukemia in the Oncohematology department of the National Hospital of Niamey. Methods: This was a prospective study, over a period of 2 years from January 1, 2018 to December 31, 2019, in patients with acute leukemia in the Oncohematology department of the National Hospital of Niamey (HNN), whose diagnosis was made on a blood smear associated with a myelogram and immunophenotyping and who were consenting. Results: We collected 25 cases of acute leukemia confirmed by myelogram and immunophenotyping. The mean age of the patients was 31.32 years, with a predominance of women, a sex ratio of 0.92. Pupils and students were in the majority with 40% and most came from the Niamey region, i.e. 68%. Anemic syndrome was the most common clinical sign in 96%. ALL predominated in 64% of cases. On the blood count, the hyperleukocytosis was more marked in AML (mean white count: 197256.6 elts/mm3) than in ALL (137891.6 elts/mm3), it was the same for thrombocytopenia which is more marked in AML (75588.89/mm3) than in ALL (52156.25/mm3). Therapeutically, 52% of patients received chemotherapy. The mean overall survival was 16.223 ± 3.191 months, including a mean survival for AML of 6.853 ± 1200 months compared to 21.720 ± 5.920 months for ALL. Conclusion: Acute leukemia still remains a major problem in our context, due to the precariousness of limited financial, diagnostic and therapeutic resources. Thus reflecting in our results, the increasing number of cases, the diagnostic delay and the guarded prognosis. This is the reality in several other countries in the sub-region and even in certain developed countries.

关键词： Acute Leukemia ALL AML Hematology-Niamey National Hospital (HNN) Niger

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Evaluation of the “Helicobacter pylori” Eradication Rate by Bismuth Quadritherapy or Concomitant Quadritherapy in Black Africans

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Open Journal of Gastroenterology 2024年第3期14卷 69-79页

作者： Diallo Mamadou Sarifou Youssouf oumarou Yaogo Abdoulatif Diallo Kadiatou Diallo Djenabou Wann Thierno amadou Bah Mamadou Lamine Yaya Diallo Ahmed Tidiane Diakhaby Mamadou Kanté Mamadou Aliou Sylla Djibril Hepato-Gastroenterology Department of the Donka National Hospital CHU Conakry Guinea Faculty of Health Sciences and Techniques Gamal Abdel Nasser University Conakry Guinea Internal Medicine Department Centre Hospitalier Universitaire Communautaire de Bangui Bangui Central African Republic Hepato Gastroenterology Department Angré University Hospital Abidjan Ivory Coast Department of Internal Medicine Donka National Hospital CHU Conakry Guinea

Introduction: Gastric infection by “Helicobacter pylori” remains a topical issue due to the evolving scientific data concerning its pathophysiology, the diseases and pathologies concerned, which now extend beyond the gastric or digestive sphere, and the treatment methods faced with the development of antibiotic resistance. Diagnosis of infection involves two inseparable aspects: identification of the bacterium itself and identification of the endoscopic and histological lesions caused by the bacterium. Objective: To evaluate the rate of eradication of Helicobacter pylori infection by bismuth quadruple therapy and concomitant treatment. Patients and methods: This was a prospective, cross-sectional, analytical study of all outpatients in the hepato-gastroenterology department during the study period from 1 January 2022 to 30 November 2023. All patients had undergone oeso-gastroduodenal fibroscopy and the diagnosis was made by histological examination of the gastric biopsy. Results: Our 113 patients comprised 68 men and 46 women. The sex ratio was 1.48 in favour of men. The mean age of our patients was 40.28 years, with extremes of 13 and 80 years. The clinical signs that prompted oeso-gastroduodenal fibroscopy were as follows: epigastralgia (69.91%), dyspepsia (14.16%), vomiting (7.08%), gastro-oesophageal reflux (6.19%) and altered general condition with weight loss (2.65%). The endoscopic lesions were: gastropathy (antral, fundic and diffuse: antro-fundial) (69.02%), bulbar ulcer (6.19%), gastric ulcer (5.31%). Helicobacter pylori infection was associated with chronic gastritis in all our patients;it was mild in 50%, moderate in 41% and severe in 9%. The eradication rate of Helicobacter pylori according to the treatment protocol used was 92.30% for bismuth quadruple therapy and 94.12% for concomitant quadruple therapy. Conclusion: The eradication rate of Helicobacter pylori in our study was 92.30% and 94.12% respectively for bismuth quadritherapy and concomitant the

关键词： “Helicobacter pylori” Eradication Quadritherapy Antibiotics Conakry

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