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Study of the Characteristics of Large-Diameter Iron Bars Obtained by Rolling at the ODHAV Foundry in the Republic of Guinea

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Journal of Materials Science and Chemical Engineering 2024年第6期12卷 43-54页

作者： Alpha Issa Diallo Jean Ahmadou Kourouma Adama moussa Sakho Younoussa moussa Baldé Mamadou Madaniou Sow Alexandre Lucien Richard Mechanical Laboratory Higher Institut of Technology of Mamou Mamou Republic of Guinea Materials Laboratory of the Gamal Abdel nasser University of Conakry Conakry Republic of Guinea Dpartment of Laboratory Technology Higher Institut of Technology of Mamou Mamou Republic of Guinea Department of Energy Science Higher Institut of Technology of Mamoun Mamou Republic of Guinea

This work consists of evaluating the quality of the mechanical parameters of large-diameter steels, i.e. 20, 25, 28 and 32, through a process of recycling scrap metal that fills garages, rubbish dumps, gutters and other abandoned sites, as well as imported concrete reinforcing steel sold in the Republic of Guinea. To carry out this important work, a number of mechanical tensile and bending tests and a microscopic analysis combining two devices, an electron microscope and a photographic camera, were carried out. The samples were taken from sampling areas in the major communes of Conakry, namely: Casse Sonfonia, Matoto and Kagbélen. The tensile strength values of the large dimensions 20, 25, 28 and 32 are given in the tables.

关键词： Recycled Scrap Large Diameter Rolling Tensile Testing Bending

Microbiological and Physico-Chemical Analysis of the Waters of the “Mamouwol” Stream in the Urban District of Mamou (Republic of Guinea)

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Journal of Water Resource and Protection 2024年第8期16卷 559-568页

作者： Mamadou Lamarana Souare Mamadou Madaniou Sow Saran Camara Adama moussa Sakho Technical Department of Laboratory Superior Institute of Technology Mamou Republic of Guinea Study and Research Center in the Environment (CERE) Gamal Abdel Nasser University of Conakry Republic of Guinea

Water is essential to life and to the sustainable socio-economic development of a nation, It is therefore interesting to have a better knowledge of the quality of this water. The aim was to determine the degree of microbiological and physico-chemical pollution of the water of the “Mamouwol” river in the town of Mamou. To do this, we chose four (4) sampling sites spread throughout the town of Mamou. During the month of March (2024), 4 water samples were analyzed to monitor the water quality of this river. The average values of the flora analyzed show that these water are heavily contaminated with bacteria indicative of fecal and metal pollution. This study showed that sites: Mam4;Mam2 and Mam1 contain the highest loads, with Total Coliform counts ranging from 1534 CFU/100 ml to 2100 CFU/100 ml, the number of faecal coliforms varies between 526 and 1240 CFU/100 ml, and that of faecal streptococci between 526 and 841 CFU/100 ml. Metal content, BOD5 and COD all comply with the laboratory’s analysis criteria, although they vary from point to point.

关键词： Pollution Water Watercourses Waterborne Diseases Microbiological Analysis

Physico-Chemical Analysis of Soils Used for Pineapple Cultivation in the Sub-Prefectures of Maferinyah and Friguiagbé (Prefectures of Forécariah and Kindia) Republic of Guinea

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Journal of Agricultural Chemistry and Environment 2024年第3期13卷 251-262页

作者： Sâa Gerard Tolno Saran Camara Amadou Sylla Adama moussa Sakho Lounceny Traore Department of Laboratory Techniques Higher Institute of Technology Mamou Republic of Guinea Environmental Studies and Research Centre Conakry Republic of Guinea Department of Chemical Engineering Gamal Abdel Nasser University of Conakry Conakry Republic of Guinea

Over the years, pineapple production in the Republic of Guinea has become less competitive in the West African sub-region, with a world ranking of 144th. It is therefore only natural to review certain parameters in order to improve this ranking. To do this, certain physico-chemical parameters of soil samples from Friguiagbé and Maferinyah (in the Kindia and Forécariah prefectures) were taken and analysed using the following techniques: Pipette de Robinson, Anne, Bray II, Kapen HICDVITZ, Mc. Lead (1982). The analytical results show that the soils at Friguiagbé in Kindia and Maferinyah in Forécariah are acidic, with pH values of 4.4 and 4.7 (fields I and II) and 4.8 and 4.7 (fields I and II) respectively. The soils have a silty-sandy texture. This study could therefore serve as a guide for the Ministry of Agriculture of the Republic of Guinea.

关键词： Soil Pineapple Crop Physico-Chemical Analysis

Kidney organoids as a promising tool in nephrology

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Genes & Diseases 2022年第3期9卷 585-597页

作者： Mengyuan Wu Tingting Hu Ping Zhu moussa ide nasser Jie Shen Fang Sun Qingnan He Mingyi Zhao Department of Pediatrics The Third Xiangya HospitalCentral South UniversityChangshaHunan 410013PR China Guangdong Cardiovascular Institute Guangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhouGuangdong 510100PR China XiangYa School of Medicine Central South UniversityChangshaHunan 410013PR China

Kidney disease has become a global public health problem affecting over 750 million people worldwide and imposing a heavy economic burden on *** complex architecture of the human kidney makes it very difficult to study the pathophysiology of renal diseases in vitro and to develop effective therapeutic options for *** though cell lines and animal models have enriched our understanding,they fail to recapitulate key aspects of human kidney development and renal disease at cellular and functional *** can be derived from either pluripotent stem cells or adult stem cells by strictly regulating key signalling ***,these self-differentiated organoids represent a promising technology to further understand the human kidney,one of the most complex organs,in an unprecedented *** newly established protocols improved by organ-on-chip and coculture with immune cells will push kidney organoids towards the next ***,we focus on recent achievements in the application of kidney organoids in disease modelling,nephrotoxic testing,precision medicine,biobanking,and regenerative therapy,followed by discussions of novel strategies to improve their utility for biomedical *** applications we discuss may help to provide new ideas in clinical fields.

关键词： Biomedical research Disease modelling Kidney organoids Precision medicine Stem cells

Determination of the Physico-Chemical Quality of the Waters of the Mamouwol River in the Urban Commune of Mamou, Republic of Guinea

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Journal of Environmental Science and Engineering(A) 2024年第4期13卷 111-121页

作者： Mamadou Madaniou Sow Mamadou Lamarana Souare Adama moussa Sakho Alhassane Diami Diallo Laboratory Techniques Department Mamou Higher Institute of TechnologyMamou 063Republic of Guinea Chemistry Department Gamal Abdel Nasser UniversityConakryConakry 1147Republic of Guinea Guinea Waters Company Laboratory Almamya QuarterConakry BP:150Republic of Guinea

Water is one of the most important elements on which our daily lives depend,because of its many uses in various *** ensure that people have the right of access to water,the authorities must provide them with treated water that complies with the regulations and standards in force,particularly from a physico-chemical point of view,for all possible uses to avoid any health problems for *** aim of this research is to study the water in the Mamouwol River by measuring physico-chemical parameters:(1)pH,it varies from 5.2“Mam3”to 7.8“Mam4”in August 2021 then from 5.5“Mam3”to 7.7“Mam4”in March 2022,*** average of 6.9 for all sampling points;(2)Turbidity varies from 0.3 NTU“Mam1”to 26.3 NTU“Mam4”in August 2021,then from 0.3 NTU“Mam1”to 30.6 NTU“Mam4”in March 2022,*** average of 9.0 NTU for all sampling points;(3)Suspended matter,varying from 0.6 mg/L“Mam1”to 17.6 mg/L“Mam4”in August 2021,then from 0.6 mg/L“Mam1”to 30.0 mg/L“Mam4”in March 2022,*** average of 8.8 mg/L for all the sampling points“Mam1”,“Mam2”,“Mam3”and“Mam4”;(4)Dissolved oxygen,varying from 2.07 mg/L“Mam3”to 6.12 mg/L“Mam1”in August 2021,then from 1.05 mg/L“Mam3”to 5.05 mg/L“Mam1”in March 2022,*** average of 2.77 mg/L for all sampling points;(5)Nitrates vary from 1.32 mg/L“Mam1”to 3.96 mg/L“Mam4”in August 2021,then from 1.49 mg/L“Mam1”to 5.27 mg/L“Mam3”in March 2022,*** average of 5.53 mg/L for all sampling points;(6)Nitrites,varying from 0 mg/L“Mam1”and“Mam2”to 0.06 mg/L“Mam3”in August 2021,then from 0 mg/L“Mam1”and“Mam2”to 0.13 mg/L“Mam3”in March 2022,*** average of 0.03 mg/L for all sampling *** results show the presence of organic pollution.

关键词： River water Mamouwol physico-chemistry pollution

Analysis of the Characteristics of Materials Obtained by Recycling Scrap Metal in Guinea

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材料科学与工程（中英文A版） 2024年第1期14卷 1-10页

作者： Alpha Issa Diallo Jean Ahmed Kourouma Adama moussa Sakho Alexandre Lucien Richard Mechanical Laboratory Higher Institute of Technology of MamouMamou 063Republic of Guinea Materials Laboratory of Gamal Abdel nasser University ConakryMamou1147Republic of Guinea Department of Laboratory Technology Higher Institute of Technology of MamouMamou 063Republic of Guinea

The aim of this study was to determine the quality of rebar produced from recycled scrap metal collected throughout the country,and imported rebar sold in the Republic of *** do this,the samples were subjected to various mechanical tests involving traction,bending and microscopic *** the Lambanyi and Casse Sonfonia samples,all the tensile strength values for diameters 12,14 and 16 were above 550 ***,the iron samples from Baillobaye and the 10 mm diameters of the samples from Casse Sonfonio and Lambanyi have less appreciable *** limits of elasticity were *** various values found vary more or less from the conventional yield strength of the NF A35-016 reference supplied by CBITEC,which is 500 *** analysis gives us an insight into the internal structure of the iron samples *** study may provide the company and the vendors with an alternative for their improvements.

关键词： Steel in construction recycled scrap strength test traction bending.

Study and Formulation of Composite Flours Based on Gluten Flour and Local Cereal Flours: Fonio, Millet and Sorghum

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Journal of Agricultural Chemistry and Environment 2024年第1期13卷 169-181页

作者： Laouratou Bah Kéloua Kourouma Adama moussa Sakho Aboubacar Diallo Mamadou Madaniou Sow Laboratory of Food and Nutritional Sciences of the Higher School of Tourism and Hospitality Conakry Republic of Guinea Department of Laboratory Technology Higher Institute of Technology of Mamou Mamou Republic of Guinea Higher Institute of Architecture and Town Planning Conakry Republic of Guinea Department of Chemistry Gamal Abdel Nasser University of Conakry Conakry Republic of Guinea

This study makes it possible to establish baking flours of nutritional quality and technologically acceptable following the increase in their rheological parameters due to the insertion of gluten flour. The composite flours were obtained using the Philips mixer type (model HR2811). The nutritional qualities of the formulated flours were determined by the Kjeldahl, AOAC 985-29, UV-VIS spectrophotometry (DR 5000;HACH and LANGE, France) and Soxhlet gravimetric methods. The compounds obtained are respectively: Protein, carbohydrate, lipid, micronutrient and vitamin contents. Monitoring the analysis of functional properties (water and oil absorption capacity) as well as baking value.

关键词： Cereal Flour Gluten Flour Bread Making Biochemical and Rheological Properties

Design and Production of Infant Flours Based on Pumpkin Pulp Enriched with Cakes Extracted from Its Seeds

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Journal of Agricultural Chemistry and Environment 2024年第2期13卷 192-207页

作者： Koumba Hawa Toundoufedouno Kéloua Kourouma Adama moussa Sakho Karamoko Lansary Sylla Aboubacar Diallo Laboratory of Food and Nutritional Sciences College of Tourism and Hotel Trade Conakry Republic of Guinea Department of Laboratory Technology Mamou Higher Institute of Technology Mamou Republic of Guinea Department of Chemistry Gamal Abdel Nasser University of Conakry Conakry Republic of Guinea Higher Institute of Architecture and Town Planning Conakry Republic of Guinea

The inclusion of composite flours in infant food at weaning time should be a priority for mothers. The aim of this project is to formulate infant flour based on pulp flour enriched with oilcake from these grains after extraction of the oil. To do this, the elements were combined to obtain a regulatory formulation. Micro- and macronutrients, minerals, vitamins and tasting of the prepared porridge were determined. The results obtained were satisfactory. The moisture content of the fruit pulp was determined using oven-drying techniques: 92.2%, carbohydrates 6.00%, lipids 0.3%, ash 0.80%, proteins 1.10%, calcium 19.8%, phosphorus 42.6% and iron 0.4%. Furthermore, the carbohydrate content of flours composed of 5% insertion is 62.9 g to 48.8 g per 100 g, and the protein content of compound flours with 5% insertion is 15.9 g to 28.25 g per 100 g. On the other hand, the vitamin C and E contents of fresh pulp and oilcake are 25 mg, 13 mg and 21 mg respectively. However, only copper and β-carotene from 5% to 30% insertion remain invariant to the different insertion rates, with a value of 25 mg for copper and 0 µg for β-carotene. In addition, a variation in the degree of swelling of weaning flours compared with the standard from 3.95% at 5% insertion to 3.58 at 30% insertion was observed. The solubility of flours increases on the one hand with increases in the degree of insertion of the cakes. Flour formulated so many toward basicity. But the presence of traces of oil containing fatty acids can reduce this basicity. This study may be an alternative of industrial flours in infant nutrition.

关键词： Pumpkin Seeds Oilcake Infant Flour Oil Micronutrients

Assessment of Upper Guinea’s Wind Energy Potential with a View to identifying Exploitable Sites

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Journal of Energy and Power Engineering 2024年第1期18卷 9-17页

作者： Nènè Aïssata Baldé Amadou Lamarana Bah Idrissa Diaby Cellou Kanté Adama moussa Sakho Department of Energy Science Higher Institute of Technology of MamouMamou BP 063Mamou Republic of Guinea Teaching and Research Laboratory in Applied Energy Gamal Abdel Nasser University of ConakryConakry BP 1147Republic of Guinea Technical Laboratory Department Higher Institute of TechnologyMamou BP 063Mamou Republic of Guinea

As part of the national strategy to further develop the wind energy sector,the eight prefectures of Upper Guinea have been *** meteorological data recorded over thirty years(1991-2021)at a height of 20 m,we assessed wind resources in terms of characteristic speeds,power and available *** this end,the Weibull distribution method was used and the following values were obtained:3.66 m/s for the average speed;1,102.83 W/m^(2)for the available power and 8,747.06 kWh/m^(2)/year for the annual available energy.

关键词： Wind energy Weibull distribution high Guinea