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Risk Factors for COVID-19 Related Death during the First Three Waves of the Pandemic in an Epidemic Treatment Center at Dakar, Senegal

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Advances in Infectious Diseases 2023年第2期13卷 117-131页

作者： Moustapha Diop Papa Samba Ba Viviane Marie Pierre Cisse Ndèye Aissatou Lakhe Betty Fall Moustapha Lo ndong essomba Bruce Wembulua Fatimata Wone Becaye Fall Khardiata Diallo-Mbaye Daye Ka Louise Fortes Ousmane Faye ndongo Dia Khalifa Ababacar Wade Abdou Rajack Ndiaye Amadou Alpha Sall Moussa Seydi Mame Thierno Dieng Epidemic Treatment Center Dakar Principal Hospital Dakar Senegal Infectious and Tropical Diseases Department FANN Teaching Hospital Dakar Senegal Psychiatry Department Dakar Principal Hospital Dakar Senegal Internal Medicine Department Deido District Hospital Douala Cameroon Dalal Jamm Hospital Dakar Senegal Federation of Laboratories Dakar Principal Hospital Dakar Senegal Pasteur Institute of Dakar Dakar Senegal Anesthesia-Resuscitation Department Dakar Principal Hospital Dakar Senegal Dakar Principal Hospital Dakar Senegal

Introduction-Objective: COVID-19 is a highly transmissible but often mild viral infection. However, some patients can present severe COVID-19 and subsequently die. The aim of the present study was to assess the risk factors for COVID-19 related death during the first three waves of the disease at the Epidemic Treatment Center (ETC) of Dakar Principal Hospital (DPH). Method: We conducted a descriptive and analytical perspective survival study from April 4, 2020 to September 25, 2021, including adult patients with COVID-19, hospitalized at the ETC of DPH. Log Rank test and multivariate Cox model were performed to identify risk factors for death. Results: We included 556 COVID-19 patients with mean age of 57 ± 17 years and a male-to-female ratio of 1.26. The number of deaths during one month of follow-up was 41, representing a cumulative risk of 7.4%. The log Rank test showed that being from the third wave (p = 0.0056), advanced age (p = 0.00098), presence of at least one comorbidity (p = 0.034), High blood pressure (p = 0.024), d-dimer level ≥ 1000 IU/L (p Conclusion: Our study showed that elderly and third-wave of COVID-19 patients were more at risk to die. Knowledge of risk factors for COVID-19 related death could improve the prognosis of these patients.

关键词： COVID-19 Waves Death Risk Factors Dakar

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Risk Factors for COVID-19 Related Death during the First Three Waves of the Pandemic in an Epidemic Treatment Center at Dakar,Senegal

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Advances in Infectious Diseases 2023年第2期

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Niobium–tantalum oxide minerals in alluvial placer deposits from the Ngoura area,East-Cameroon

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Acta Geochimica 2021年第1期40卷 13-24页

作者： Francois ndong Bidzang Elise Sababa Tessontsap Teutsong Ore Processing Laboratory Institute of Geological and Mining ResearchP.O.Box 4110YaoundeCameroon Department of Earth Sciences University of Yaounde 1.P.O.Box 812YaoundeCameroon

This work presents a preliminary mineralogical characterization of Nb-Ta oxide minerals from alluvial placers located in the Ngoura area,eastern *** heavy minerals are characteristic of short hydromechanical transport and highlight the stability of Nb-Ta oxides during the weathering and ***-Ta mineralization in placer deposits from the Ngoura area may derive from local *** assemblage of Nb-Ta oxides in the studied placers consists of tapiolite-(Fe)and tantalite-(Mn).Tapiolite-(Fe)exhibits high concentrations in Ta2O5(78.07-80.46 wt%)and FeO(12.18-13.66 wt%)and plots within a narrow range of Ta*(0.900-0.933)and Mn*(0.037-0.119),which correspond to the ranges typically observed in tapiolite-(Fe)***-(Mn)shows Ta2O5 contents ranging from 62.17 to 69.45 wt%,Nb2O5 from 12.09 to 17.37 wt%,MnO from 7.63 to 12.49 wt%and FeO from 1.48 to 6.62 wt%.It is also characterized by a wider range of Mn*(0.538-0.891)and relatively homogeneous Ta/(Ta+Nb)(0.683-0.779)***,the studied Nb-Ta minerals exhibit oscillatory zoning characterized by bright Ta-rich zones alternating with dark Nb-rich *** oscillatory zoning is progressive in some minerals and the alternating bands may appear regular to wavy with gradual *** zoning in Nb-Ta oxides from the Ngoura placers is considered to be a primary magmatic feature and is tentatively explained as a result of magmas mixing,rapid cooling or degassing/decompression of the igneous *** geomorphology and the tropical humid climate of the eastern region offer suitable conditions for the deposition of alluvial ***,niobium-tantalum minerals from the Ngoura placers must have been sourced from the weathering and erosion of alkaline granites and pegmatites widespread in the study area.

关键词： Niobium Tantalum Tapiolite-(Fe) Tantalite-(Mn) Ngoura placer East Cameroon

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Research on Fisheries Investment Attraction in Equatorial Guinea

Research on Fisheries Investment Attraction in Equatorial Gu...

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作者： BERNARDO ndong EDU 大连海洋大学

学位级别：硕士

Fisheries production and growth,especially from the marine sector,are significant for the socioeconomic growth of Equatorial Guinea and its significant contribution to the country’s economic development the Gross Domestic Product or *** Guinea is blessed with a lot of marine fisheries resources that could increase the production of ***,initial supply from the production of domestic is far below the fish needs of the *** research is mainly focused on investment attraction in Equatorial Guinea in the sector of fisheries and also focused on marine *** research adopted a desk review ***’s mainly divided into different sections and chapters such as the Equatorial Guinea fisheries sector,marine fisheries resources in Equatorial Guinea,the status of marine fisheries production and growth in Equatorial Guinea,influential factors of investment,and current situations of investment in the fisheries sector of Equatorial *** research will also provide problem analysis on fisheries investment in Equatorial Guinea,and also gives some policy suggestions on increasing investment in Equatorial *** paper mainly concludes that the contribution of aquaculture to marine fisheries growth has been low,in contrast to the marine capture fisheries growth in Equatorial *** research will also demonstrate that despite the availability of rules and regulations,noncompliance by fisher folks has not helped to enhance marine fisheries growth in Equatorial ***,mainly recommends that the culture of marine fishes should be intensified in order to increase the investment in the Fishery sector in Equatorial *** most economic sectors,enhances capital and investments are often considered virtuous,mainly showing confidence in the future and expected *** the sector of fisheries,however,investments are often harmful,as they may lead to enhances incapacity of the fleet,which is not desirable considering the fully explo

关键词：赤道几内亚渔业投资吸引潜力

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German Poetry in African Languages： The Translation of Selected German Poems From an Intercultural Perspective

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Journal of Literature and Art Studies 2017年第3期7卷 255-263页

作者： Louis ndong University Cheikh Anta Diop Dakar Senegal

The article deals with the translation of German poetry into Wolof and is based on Tamsir Annes＇s translation of German poems under the title Tdere-Woy yi/Das Buch der Lieder. My purpose in this paper is to answer the question of how elements of the vocabulary of sciences （literature and philosophy） as well as cultural specific items are rendered in the Wolof target text. Therefore, in this work, I explore methods and strategies of translation like borrowings, paraphrases, and analyze furthermore some differences noticeable in the translation of some poems at the cultural level. These analysis-steps enable the investigation of, contextually, the central issue of ＂cultural translatability＂ and the reception of translation of European poetry into African languages in general and German poetry into Wolof in particular. The article also focuses on the importance of the reception of German poetry in Wolof as a means of intercultural communication between German and Wolof-speaking countries but as means to develop African languages like Wolof in which the translation of the selected poems has been operated.

关键词： translation poetry cultural strategies intercultural communication

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Efficient dechlorination of chlorinated solvent pollutants under UV irradiation by using the synthesized TiO_2 nano-sheets in aqueous phase

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Journal of Environmental Sciences 2014年第5期26卷 1188-1194页

作者： Landry Biyoghe Bi ndong Murielle Primaelle Ibondou Zhouwei Miao Xiaogang Gu Shuguang Lu Zhaofu Qiu Qian Sui Serge Maurice Mbadinga State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process East China University of Science and Technology State Key Laboratory of Bioreactor Engineering and Institute of Applied Chemistry East China University of Science and Technology

Titanium dioxide （TiO2）, which is the widely used photo-catalyst, has been synthesized by simple hydrothermal solution containing tetrabntyl titanate and hydrofluoric acid. The synthesized product has been applied to photo-degradation in aqueous phase of chlorinated solvents, namely tetra- chloroethene （PCE）, tdchloroethene （TCE） and 1,1,l-trichloroethane （TCA）. The photo-degradation results revealed that the degradation of these harmful chemicals was better in UV/synthesized TiO2 system compared to UV/commerciai P25 system and UV only system. The photo-catalytic efficiency of the synthesized TiO2 was 1.4, 1.8 and 3.0 folds higher compared to the commercial P25 for TCA, TCE and PCE degradation, respectively. Moreover, using nitrobenzene （NB） as a probe of hydroxyl radical （.OH）, the degradation rate was better over UV/synthesized TiO2, suggesting the high concentration of .OH generated in UV/synthesized TiO2 system. In addition, .OH concentration was confirmed by the strong peak displayed in EPR analysis over U~/synthesized TiO2 system. The characterization result using XRD and TEM showed that the synthesized TiO2 was in anatase form and consisted of well-defined sheet-shaped structures having a rectangular outline with a thickness of 4 rim, side length of 50 nm and width of 33 nra and a surface 90.3 m^2/g. XPS analysis revealed that ≡Ti-F bond was formed on the surface of the synthesized TiO2. The above results on both photocatalytic activity and the surface analysis demonstrated the good applicability of the synthesized TiO2 nano-sheets for the remediation of chlorinated solvent contaminated groundwater.

关键词： photo-degradation TiO2 chlorinated solvent pollutants nitrobenzene UV illumination groundwater remediation

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Comparison of electrochemiluminescence and ELISA methods in the detection of blood borne pathogens in Gabon

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Asian Pacific Journal of Tropical Biomedicine 2017年第9期7卷 805-808页

作者： Cyrille Bisseye Jophrette Mireille Ntsame ndong Anicet Mouity Matoumba Calixte Bengone Guy Mouelet Migolet Bolni Marius Nagalo Laboratory of Molecular and Cellular Biology University of Sciences and Techniques of Masuku(USTM)P.O.Box 943FrancevilleGabon National Blood Transfusion Center P.O.Box 13895LibrevilleGabon Department of Hematology/Oncology Mayo Clinic ScottsdaleAZUSA

Objective: To assess the performances of Cobas 6000 e601 and EVOLIS Bio Rad in the detection of HIV, HBV and HCV in blood donors in Libreville(Gabon).Methods: A cross-sectional investigation was conducted in July 2017 in a total of 2 000 blood donors recruited at the National Blood transfusion Center, Libreville *** them, 363 donors were selected to compare the performances of COBAS 6000 e601(electro-chemiluminescence) and EVOLIS Bio Rad in detecting HIV, HBV and HCV using Cohen's kappa ***: Both methods yielded similar results for the detection of HIV and HBs Ag. A very good agreement of 93.39% and an excellent agreement of 98.90% were obtained for the detection of HIV and Hbs Ag, with kappa values of 0.80 and 0.98, respectively. The observed agreement of 91.86% was found for the detection of HCV, which gave a fair agreement between the two methods with kappa = ***: The two evaluation methods showed a similar performance in the detection of HIV, HBV. However, given the high rate of intra and inter-genotypes recombination known for HIV and HBV, more robust techniques of detection such as polymerase chain reaction should be used to prevent post-transfusion contaminations.

关键词： Cobas 6000 e601 EVOLIS BioRad Kappa coefficient Blood donors

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Variation of the Consumption of Mushrooms by Pygmies and Bantus in the North of Gabon

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Advances in Microbiology 2014年第16期4卷 1212-1221页

作者： Hugues Calixte Eyi ndong Steeve Mounguengui Christiane Attéké Geraldine Obone ndong Institute of Technological Research Libreville Gabon Institute of Research in Tropical Ecology Libreville Gabon University of Sciences and Technics of Masuku Libreville Gabon

A comparative study of the number of taxa and fungal biomass consumed by the Pygmies and the Bantus of Gabon has been realized in two Gabon north regions (Ogooue-Ivindo and the Woleu-Ntem). This study has allowed not only to establish the list of consumed fungal sorts by those populations, but also to estimate the daily consumed fungal biomasses by each ethnical group. The study has revealed a significant difference between a numbers of taxa and the quantity of mushrooms consumed by various ethnical groups: the Pygmies of the area who live especially by hunting and fishing consumed 96% of the recorded taxa with some high mushrooms quantities (around 3 kg/day/family);the Bantus who live nearby Pygmies also consumed some high mushrooms quantities (around 2 kg/day/family) but a low taxa number (56% of taxa counted by the Fang;69% by the Kota;39% by the Kwele);on the other hand, the Bantus living nearest the Pygmies consumed a high taxa number as much as Pygmies (around 90% of taxa counted) but eat a lower mushrooms quantities than theirs distant congeners Pygmies (around 800 g/day/family).

关键词： Pygmies Bantus Mushrooms Gabon

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Rehabilitation of Mining Sites: The Case of the Gora/Sabodala Gold Mine in Senegal Prospects for Sustainable Development of a Mine

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Journal of Environmental Protection 2021年第10期12卷 784-807页

作者： Dieye Pathé Mall Ibrahim Samb Mansour ndong Robert Institut Africain de Management Dakar Senegal Amadou Makhtar Mbow University Dakar Senegal Geology and Hydrogeology Applied to Mines and Major Civil Engineering Works Dakar Senegal Environment Department at Sabodala Gold Operations Dakar Senegal

The southeastern part of Senegal, in West Africa, is home to the country’s first major gold mine owned by Sabodala gold operations SGO, as subsidiary of Teranga Gold Corporation during the timeframe of this study. As part of its expansion, the company opened and operated the Gora satellite mine for 4 years’ exploitation. At the end of the mine’s life, the authorities decided to close the site. In this context, SGO in compliance with its legal, regulatory and normative obligations, has commissioned a study of rehabilitation activities for a better environmental and social management of the Gora gold mine. This study is a first in Senegal and presents the general framework for the rehabilitation of a gold mine which will allow scientists to have several research perspectives in this field. The methodological approach consisted of a participatory process of collecting field data and data from stakeholders directly involved in mine rehabilitation and closure;these data were analyzed and coupled with international best practices in rehabilitation, closure, and post-mine management. Results of the selected options are based on known experiences from around the world, coupled with analysis of the SGO’s field activities results and those obtained from the synthesis of the interview guides from the numerous consultations. This synthesis made possible to align them with international guidelines presented in this document. In this context, the aspects related to the open-pit mine equipment, processing facilities and related infrastructure were a particular interest to the various stakeholders. Thus, the following rehabilitation options were retained by the group constituted by the populations: 1) Backfilling pits, for cultivation practices and development of agribusiness and the establishment of grazing land for livestock;2) Setting up water storage basins for the sustainable development of certain activities around the mine and aquifer recharge while respecting the protection

关键词： Rehabilitation Mine Closure Gora Sabodala Environment Sustainable Development

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Covid-19大流行期间亚马逊采取的应对措施研究

Covid-19大流行期间亚马逊采取的应对措施研究

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作者： Richard Alain Waly ndong 辽宁大学

学位级别：硕士

当前的新冠大流行已经严重影响了整个全球。当回顾2020年时,它无疑是影响人们生活的最重要因素。亚马逊在这场新冠疫情的零售业中发挥了非常重要的作用,并对人们在疫情限制下生活的方式产生了深远的影响。为了更好地理解亚马逊公司是如... 详细信息

当前的新冠大流行已经严重影响了整个全球。当回顾2020年时,它无疑是影响人们生活的最重要因素。亚马逊在这场新冠疫情的零售业中发挥了非常重要的作用,并对人们在疫情限制下生活的方式产生了深远的影响。为了更好地理解亚马逊公司是如何发挥如此重要的作用的,本文着重研究了亚马逊公司在2020年新冠疫情期间的经营管理以及该公司在这一时期所面临的问题。本文的目的是详细说明和论证决策在组织中的影响,特别是在运营部门,以及如何优化决策以获得最佳的产出。此外,本研究的目的是帮助企业更好地优化经营部门,因为它通常是公司经营战略的关键部分。同时本研究能够帮助管理者更好地了解危机时期的决策过程和管理。本文共分为五章。在第一章中,介绍了本研究所依据的主要概念和理论,包括运营管理、供应链管理和决策过程,以便更好地理解后面的研究问题。接下来,第二章介绍亚马逊公司在新冠疫情之前的情况,然后分析该公司在新冠疫情期间遇到的问题。第三章对亚马逊存在问题的主要根源进行分析。新冠疫情只是引发了其中一些问题的出现,而不是造成这些问题。第四章介绍了亚马逊公司针对第二章末尾提出的问题所采取的措施,并对所采取的措施、个人建议和纠正措施进行了深入分析。最后,第五章是论文的总结。在决策过程的研究中我们很少遇到决策过程中的不确定性研究。因此,这项研究填补这一空白,即调查在新冠疫情期间亚马逊公司内部的运营管理。

关键词：经营管理决策过程供应链管理亚马逊新冠

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