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The Effects of Age and Ejaculatory Abstinence on Semen Quality and Reproductive Hormones in africa and the Middle East

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Advances in Reproductive Sciences 2024年第2期12卷 98-115页

作者： Lionel Wildy Moungala Opheelia Makoyo Androcryos Andrology Laboratory Johannesburg South Africa Department of Obstetrics and Gynaecology Mere-Enfant Hospital Libreville Gabon

The aim of this study was to retrospectively evaluate the effects of male age and ejaculatory abstinence on semen parameters and reproductive hormones among men residing in africa and the Middle East. A total of 70,142 semen analysis results were analysed and grouped according to the age intervals (16 - 20, 21 - 30, 31 - 40, 41 - 50, 51 - 60, >60) and ejaculatory abstinence (5 days). Semen parameters i.e. volume, concentration, progressive motility, total progressively motile count, morphology, total normal sperm count, DNA fragmentation, viability, sORP, normed sORP were specifically evaluated. Additionally, for each age interval, reproductive hormones i.e. estradiol, luteinizing hormone, follicle stimulating hormone, testosterone and prolactin were evaluated. Semen volume, total progressively motile count, sperm morphology and total normal sperm count constantly decrease significantly after the age of 30 years. Sperm concentration started declining significantly after the age of 50 years. There was a constant age- related increase in number of spermatozoa with damaged DNA. sORP constantly increased up to 60 years. Furthermore, constantage-related decreases in FSH, serum testosterone and prolact in were observed from patients aged between 16 years and 60 years. Semen volume, sperm concentration, progressive motility and normal morphology were significantly higher in patients having > 5 days of abstinence. Patients having > 5 days of abstinence had the lowest normed sORP. Male age significantly affects sperm parameters and reproductive hormones in fertile and infertile men residing in africa and the Middle East. Prolonged abstinence days provides better semen quality.

关键词： africa Middle East Reproductive Hormones Semen Quality

NEURAL NETWORK ASSESSMENT OF ROCKBURST RISKS FOR DEEP GOLD MINES IN SOUTH africa

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中国有色金属学会会刊：英文版 1998年第2期8卷 160-166页

作者： Feng XiatingCollege of Resources and Civil Engineering,Northeastern University, Shenyang 110006, P. R. ChinaS. WebberCSIR Mining Technology, Johannesburg, South africaM. U. OzbayDepartment of Mining Engineering,University of the Witwatersr

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关键词： neural network rockburst risk South africa

Insights for africa’s Industrialisation

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Chinafrica 2024年第1期16卷 14-15页

作者： ZHANG JIN CHEN XIAO Centre for International Knowledge on Development Beijing

The First Industrial Revolution in the 18th century started the modernisation process marked by profound economic,social,and cultural transformations in the world.Research shows that the process of industrialisation is closely associated with improvements in people’s living standards and their quality of life.Industrialisation,with economic and technological change at its core,is central to modernisation.

关键词： africa profound economic

China Remains africa’s Top Trading Partner

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Chinafrica 2024年第3期16卷 60-61页

China has remained africa’s largest trading partner for 15 consecutive years,with bilateral trade reaching a record$282.1 billion in 2023,Ministry of Commerce official Jiang Wei said at a press conference on 31 Janua... 详细信息

关键词： trading africa partner

Improving Lives China-africa cooperation propels space industry,drives socio-economic progress

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Chinafrica 2024年第5期16卷 28-29页

作者： EHIZUELEN MICHAEL MITCHELL OMORUYI Centre for Nigerian Studies Institute of African StudiesZhejiang Normal University

In the past,outer space was primarily the domain of a few powerful countries and generally considered separate from broader concerns of human security and development.However,in recent times,space technology development has been a dynamic arena in which the majority of the world’s countries,including countries across the continent of africa,are actively engaged to address their most pressing socio-economic challenges.Since the turn of the millennium,countries across africa have demonstrated growing interest in developing their space capabilities to address their most pressing challenges,including but not limited to climate change,poverty,terrorism,and forced migration.

关键词： africa primarily challenges

Prevalence and outcomes of polycystic kidney disease in african populations:A systematic review

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World Journal of Nephrology 2024年第1期13卷 33-40页

作者： Modou Ndongo Lot Motoula Nehemie Baratou Coundoul Abou Abdallah Malick Diouara Sidy Mohamed Seck Department of Nephrology and Dialysis Regional Hospital of KedougouKedougou 26005Senegal Department of Nephrology and Dialysis Military Hospital of OuakamDakar 28216Senegal Department of Chemical Engineering and Applied Biology Polytechnic high School of Cheikh Anta Diop UniversityDakar 5085Senegal Department of Nephrology Faculty of Health SciencesUniversity Gaston BergerSaint-Louis 234Senegal

BACKGROUND Polycystic kidney disease(PKD)is the most common genetic cause of kidney disease.It is a progressive and irreversible condition that can lead to end-stage renal disease and many other visceral complications.Current comprehensive data on PKD patterns in africa is lacking.AIM To describe the prevalence and outcomes of PKD in the african population.METHODS A literature search of PubMed,african journal online,and Google Scholar databases between 2000 and 2023 was performed.The Preferred Reporting Items for Systematic Reviews and Meta-Analyses were followed to design the study.Clinical presentations and outcomes of patients were extracted from the included studies.RESULTS Out of 106 articles,we included 13 studies from 7 african countries.Ten of them were retrospective descriptive studies concerning 943 PKD patients with a mean age of 47.9 years.The accurate prevalence and incidence of PKD were not known but it represented the third causal nephropathy among dialysis patients.In majority of patients,the diagnosis of the disease was often delayed.Kidney function impairment,abdominal mass,and hypertension were the leading symptoms at presentation with a pooled prevalence of 72.1%(69.1-75.1),65.8%(62.2-69.4),and 57.4%(54.2-60.6)respectively.Hematuria and infections were the most frequent complications.Genotyping was performed in few studies that revealed a high proportion of new mutations mainly in the PKD1 gene.CONCLUSION The prevalence of PKD in african populations is not clearly defined.Clinical symptoms were almost present with most patients who had kidney function impairment and abdominal mass at the diagnostic.Larger studies including genetic testing are needed to determine the burden of PKD in african populations.

关键词： Polycystic kidney disease africa Genetic disorder Systematic review

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Fresh Impetus

Chinafrica 2024年第1期16卷 20-23页

作者： HE WENPING Institute of West-Asian the Chinese Academy of Social Sciences

The year 2023 marked the 10th anniversary of the Belt and Road Initiative(BRI)and the 10th year since Chinese President Xi Jinping visited africa in 2013,his first foreign visit after taking o!ce,during which he proposed the principles of sincerity,real results,amity and good faith for China’s africa policy and the principle of upholding justice while pursuing shared interests.

关键词： policy africa anniversary

Useful Guides for Doing Business

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Chinafrica 2024年第2期16卷 26-28页

作者： XIA YUANYUAN 不详

Industrialisation is central to africa’s development.With its young labour force,abundant natural resources and fast-growing internal markets,africa has the potential of being the next global frontier for industrial development.In January,in order to further promote the process of african industrialisation and support China-africa cooperation in trade and investment,China africa Industrial Forum(CAIF),an organisation facilitating China-africa exchanges and cooperation in diverse fields,published the 2024 african Industrialisation Prospects Index and 2024 african Business Environment Index for the first time in Chinafrica.

关键词： investment africa frontier

Supporting Industrialisation Drive

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Chinafrica 2024年第6期16卷 18-21页

作者： XIA YUANYUAN 不详

As africa pushes forward its industrialisation process,the Chinese-built industrial parks and free trade zones have assumed special significance as drivers of the region’s industrial development and job creation.At the same time,africa is also learning from China’s successful experience in industrialisation.What are the ways in which China and african countries can deepen industrial cooperation?What are the roadblocks to such cooperation and the process of industrialisation in africa?

关键词： africa cooperation push