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Digital addiction and emotional exhaustion as mediators between problematic internet use and mental well-being in university students 数字成瘾和情绪耗竭在大学生网络问题使用与心理健康之间的中介作用
IF 3.3 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2025-12-19 DOI: 10.1016/j.sciaf.2025.e03151
David Adedia , Kennedy Diema Konlan , Delight Tsogbe , Nuworza Kugbey , Elvis Reindolf Kale , Vincent Uwumboriyhie Gmayinaam , Judith Akworkor Anaman-Torgbor , Martin Amogre Ayanore

Background

The increasing reliance on digital technology has raised concerns about its impact on mental health and well-being, particularly among university students. Problematic internet use, digital addiction, and emotional exhaustion have emerged as key factors influencing students' psychological well-being. Despite established associations between excessive internet use and addictive behaviors, the mechanisms through which it influences mental health remain insufficiently elucidated. This study investigated the relationship between problematic internet use and mental well-being, with a focus on whether digital addiction and emotional exhaustion mediate this relationship.

Methods

A cross-sectional survey design was used, involving 815 students from three tertiary institutions in Ghana. Standardized and validated scales were used to measure mental well-being, emotional exhaustion, digital addiction, and problematic internet use. Statistical analyses, including correlation and confirmatory factor analyses were used to determine the correlations, reliability and validity of the scales. Structural equation modelling was employed to ascertain the direct and mediation effects on mental well-being.

Results

One out of every three students (35%) reported problematic internet use. Bivariate results showed that mental well-being was negatively correlated with emotional exhaustion (-0.25, p < 0.001), digital addiction (-0.21, p < 0.001), and problematic internet use (-0.36, p < 0.001). Mediation results showed emotional exhaustion as a significant mediator (β = -0.07, p < 0.001), while digital addiction did not significantly mediate the relationship (β = -0.04, p = 0.094), suggesting that internet overuse primarily becomes harmful when it leads to stress and exhaustion rather than addiction itself.

Conclusion

These findings reveal that problematic internet use harms mental well-being through emotional exhaustion, underscoring the need for joint action by university management and mental health/counselling units to enhance awareness campaigns focused on addressing problematic internet use among students.
对数字技术的日益依赖引发了人们对其对心理健康和福祉的影响的担忧,尤其是在大学生中。有问题的网络使用、数字成瘾和情绪衰竭已成为影响学生心理健康的关键因素。尽管在过度使用互联网和成瘾行为之间建立了联系,但它影响心理健康的机制仍然没有充分阐明。本研究调查了有问题的互联网使用与心理健康之间的关系,重点研究了数字成瘾和情绪衰竭是否介导了这种关系。方法采用横断面调查设计,对来自加纳三所高等院校的815名学生进行调查。使用标准化和有效的量表来测量心理健康、情绪衰竭、数字成瘾和有问题的互联网使用。统计分析包括相关分析和验证性因子分析来确定量表的相关性、信度和效度。采用结构方程模型来确定对心理健康的直接和中介影响。结果三分之一的学生(35%)报告上网有问题。双变量结果显示,心理健康与情绪耗竭(-0.25,p < 0.001)、数字成瘾(-0.21,p < 0.001)和有问题的网络使用(-0.36,p < 0.001)呈负相关。中介结果显示情绪耗竭是一个显著的中介(β = -0.07, p < 0.001),而数字成瘾没有显著的中介关系(β = -0.04, p = 0.094),这表明过度使用网络主要是在导致压力和疲惫而不是成瘾本身时变得有害。结论:这些研究结果表明,有问题的互联网使用会通过情绪耗竭损害心理健康,强调了大学管理层和心理健康/咨询单位联合行动的必要性,以加强关注学生互联网使用问题的宣传活动。
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引用次数: 0
Long-term spatiotemporal trends and population-weighted exposure to PM2.5 in Greater Cairo (2000–2020) 2000-2020年大开罗地区PM2.5人口加权暴露的长期时空趋势
IF 3.3 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2025-12-19 DOI: 10.1016/j.sciaf.2025.e03150
Gamil Gamal , Naglaa Zanaty , Pavol Nejedlik
Fine particulate matter (PM₂.₅) pollution poses significant environmental and health risks in urban areas, such as Greater Cairo (GC). To provide the first high-resolution, two-decade assessment (2000–2020) of chronic exposure, this study integrates 1 km satellite-derived PM₂.₅ concentrations with comprehensive population distribution dynamics (LandScan Global). Trends were assessed using the Mann–Kendall test, and Sen’s slope was also calculated. We utilized advanced exposure metrics: the Population-Weighted Mean Concentration (PWMC) and Total Exposure (TE). A multi-level classification based on the five World Health Organization (WHO) Interim Targets and Guideline Value (IT-1, IT-2, IT-3, IT-4, and the Guideline of 5 µg/m³) was used to quantify the health significance of exposure evolution rigorously. PWMC consistently violated strict international health standards, remaining 7 to 10 times higher than the WHO Guideline (5 µg/m³) over the entire period, indicating a 100% population exposure risk. Concentrations exhibited a non-linear temporal pattern, peaking around 2010 (domain-averaged peak at 45.6 µg/m³) before showing a decline through 2020. Crucially, analysis revealed that high population growth increased the overall health burden (TE), actively counteracting localized improvements in pollution intensity (PWMC). Robust K-means clustering confirmed that the highest exposure burdens persisted in dense urban cores and industrial corridors. These findings provide quantitative evidence essential for targeted air quality management, demonstrating the urgent need for integrated urban planning and localized policies to reduce the cumulative health burden in this megacity.
细颗粒物(PM₂.₅)污染对城市地区构成重大的环境和健康风险,例如大开罗(GC)。为了提供第一个高分辨率的二十年(2000-2020年)慢性暴露评估,本研究整合了1公里卫星衍生的PM 2。₅浓度与全面的人口分布动态(LandScan Global)。使用Mann-Kendall检验评估趋势,并计算Sen斜率。我们使用了先进的暴露指标:人口加权平均浓度(PWMC)和总暴露(TE)。采用基于世界卫生组织(WHO) 5个中期目标和指导值(IT-1、IT-2、IT-3、IT-4和5µg/m³指导值)的多级分类,严格量化暴露演化的健康意义。PWMC一直违反严格的国际卫生标准,在整个期间比世卫组织指南(5微克/立方米)高出7至10倍,表明人口暴露风险为100%。浓度呈非线性时间模式,在2010年左右达到峰值(域平均峰值为45.6 μ g/m³),然后在2020年呈下降趋势。关键是,分析显示,人口的高速增长增加了总体健康负担(TE),积极抵消了污染强度(PWMC)的局部改善。稳健的k均值聚类证实,在密集的城市核心和工业走廊,暴露负担最高。这些发现为有针对性的空气质量管理提供了必要的定量证据,表明迫切需要进行综合城市规划和地方化政策,以减轻这个特大城市的累积健康负担。
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引用次数: 0
Are steering committees the governance fix in low- and middle-income countries (LMICs) infrastructure projects? 指导委员会是中低收入国家(LMICs)基础设施项目的治理解决方案吗?
IF 3.3 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2025-12-19 DOI: 10.1016/j.sciaf.2025.e03152
Alfonso Chikuni , Patsani Gregory Kumambala , Michael Chasukwa , Blessings Chinsinga
This study investigates whether Project Steering Committees (PSCs) can effectively enhance accountability, transparency, and reduce corruption risk in large infrastructure projects in low- and middle-income countries (LMICs). It employs a comparative qualitative case study design focused on three high-value infrastructure projects in Malawi, combining primary interviews with secondary document analysis, and guided by the Conceptual Project Governance Framework (CPGF). The cases span three governance models: formally constituted PSCs supported by donors, embedded Project Implementation Units (PIUs), and informal coordination mechanisms. To interpret governance dynamics and explain inter-case variation, the study applies a combined theoretical lens integrating project governance theory, institutional analysis, and public choice theory. Findings indicate that inclusive, strategically mandated PSCs with legal authority substantially improve oversight and constrain discretionary abuse. In contrast, informal or politically influenced structures correlate with higher corruption vulnerability and opaque decision-making. By offering rare project-level, empirically grounded insights, the study advances scholarship on infrastructure governance in LMICs and provides actionable guidance for institutionalizing oversight mechanisms in complex project environments.
本研究探讨了项目指导委员会(PSCs)能否有效提高中低收入国家大型基础设施项目的问责制、透明度和降低腐败风险。本研究采用比较定性的案例研究设计,以马拉维的三个高价值基础设施项目为重点,在概念项目治理框架(CPGF)的指导下,将主要访谈与次要文件分析相结合。这些案例涉及三种治理模式:由捐助者支持的正式组建的公共服务公司、嵌入式项目实施单位(piu)和非正式协调机制。本研究运用项目治理理论、制度分析理论和公共选择理论相结合的理论视角来解释治理动态和案例间差异。研究结果表明,具有法律权威的包容性、战略性授权的公共服务公司大大改善了监督并限制了自由裁量权滥用。相比之下,非正式或受政治影响的结构与更高的腐败脆弱性和不透明的决策相关。通过提供罕见的项目层面的、基于经验的见解,该研究推进了关于中低收入国家基础设施治理的学术研究,并为复杂项目环境中监督机制的制度化提供了可操作的指导。
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引用次数: 0
FUSE-Net: A hybrid ensemble learning framework for securing cloud-based intelligent transport systems in African smart mobility networks FUSE-Net:用于确保非洲智能移动网络中基于云的智能交通系统安全的混合集成学习框架
IF 3.3 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2025-12-19 DOI: 10.1016/j.sciaf.2025.e03149
Vijay Govindarajan , Merry Jebin Gnanadhas , Anant Wairagade , Muhammad Ayaz , Mohammad Hijji , Umar Danjuma Maiwada
The rapid integration of Intelligent Systems (IS) into urban mobility across Africa, through real-time data processing, cloud-enabled traffic platforms, and autonomous vehicle systems has increased exposure to advanced cyber threats. This vulnerability is particularly critical as many African countries expand their digital and smart transportation infrastructure without proportionate cybersecurity reinforcement. To address this challenge, we propose FUSE-Net, a hybrid ensemble machine learning framework for detecting anomalies and cyber intrusions within cloud-based IS environments. FUSE-Net integrates feature subspacing, dynamic classifier weighting, and meta-learning to leverage the strengths of multiple models, including Random Forest, XGBoost, Gradient Boosting, and Support Vector Machines. The framework was evaluated on benchmark datasets CICIDS 2017 and KDDCUP99 capturing both modern and legacy network traffic patterns. Additionally, it was validated on UNSW-NB15 (2015), which includes Fuzzers, Analysis, Backdoors, and Shellcode attacks, achieving 98.95% accuracy, 97.82% precision, 96.88% recall, and 97.35% F1-score. Further evaluation on CIC-IDS2018 (2018), covering Brute-Force, Heartbleed, Botnet, and DDoS attacks, reported 99.25% accuracy, 98.91% precision, 98.50% recall, and 98.70% F1-score. FUSE-Net achieved 99.92% accuracy on CICIDS 2017 and 99.97% on KDDCUP99, with high precision, recall, and F1 scores. Its low false positive rate and scalable architecture support real-time deployment in emerging smart city ecosystems. This research provides a robust foundation for enhancing cybersecurity in African ITS infrastructures and invites future collaboration with regional stakeholders to explore deployment feasibility in real-world African urban environments.
通过实时数据处理、云交通平台和自动驾驶汽车系统,智能系统(IS)迅速融入非洲的城市交通,这增加了面临高级网络威胁的风险。这一漏洞尤其严重,因为许多非洲国家在扩大其数字和智能交通基础设施的同时,却没有相应地加强网络安全。为了应对这一挑战,我们提出了FUSE-Net,这是一种混合集成机器学习框架,用于检测基于云的IS环境中的异常和网络入侵。FUSE-Net集成了特征子间距、动态分类器加权和元学习,以利用多个模型的优势,包括随机森林、XGBoost、梯度增强和支持向量机。该框架在捕获现代和传统网络流量模式的基准数据集CICIDS 2017和KDDCUP99上进行了评估。此外,在UNSW-NB15(2015)上进行了验证,其中包括Fuzzers, Analysis, Backdoors和Shellcode攻击,准确率达到98.95%,精密度为97.82%,召回率为96.88%,f1得分为97.35%。进一步评估CIC-IDS2018(2018),涵盖暴力破解、心脏出血、僵尸网络和DDoS攻击,准确率为99.25%,准确率为98.91%,召回率为98.50%,f1得分为98.70%。FUSE-Net在CICIDS 2017上的准确率为99.92%,在KDDCUP99上的准确率为99.97%,具有较高的准确率、召回率和F1分数。其低误报率和可扩展的架构支持新兴智慧城市生态系统的实时部署。这项研究为加强非洲智能交通基础设施的网络安全提供了坚实的基础,并邀请未来与区域利益相关者合作,探索在现实非洲城市环境中部署的可行性。
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引用次数: 0
A comparative study of estimation methods for the New Sine Topp-Leone Fréchet distribution 新正弦Topp-Leone分布估计方法的比较研究
IF 3.3 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2025-12-18 DOI: 10.1016/j.sciaf.2025.e03142
Amal S. Hassan , Emadeldin I.A. Ali , Hanene Hamdani , Ahmed M. Gemeay , Ahmed W. Shawki , Mohammed Elgarhy
Modeling and fitting complex datasets are crucial domains in various scientific fields. This article presents the sine Topp-Leone Fréchet distribution, a new probability distribution obtained by integrating the Fréchet distribution with the sine Topp-Leone-G family. The suggested model’s most noteworthy feature is its ability to accurately represent a broad variety of hazard rate patterns (such as upside-down, reversed J-shaped, decreasing, and increasing) with just three parameters. Its density may also display unimodal, reversed-J, and right-skewed shapes. We offer a number of statistical properties for the proposed distribution. Using sixteen different estimation approaches, we estimated the parameters of the suggested model and investigated a number of its distributional characteristics. We evaluate the validity of the suggested model and compare the efficacy of various parameter estimates using a Monte Carlo simulation. Numerical analysis shows that the Kolmogorov and second-order left-tail Anderson–Darling estimators exhibit superior efficiency and consistency in a variety of scenarios. They frequently receive the highest overall ranking based on the sum of all performance criteria and consistently produce estimates with low bias and mean squared error. Additionally, we evaluated the suggested distribution’s adaptability using two real-world datasets, demonstrating its remarkable ability to precisely fit the data. According to our findings, the suggested distribution performs better in terms of fit quality than a cotangent Fréchet, odd exponential-logarithmic Fréchet, Topp-Leone Fréchet, odd-generalized exponential inverse Weibull, generalized inverse Weibull distribution, arctan inverse Weibull, new arctan Fréchet, and Fréchet distributions.
复杂数据集的建模和拟合是各个科学领域的关键领域。本文提出了正弦Topp-Leone fracimchet分布,它是将fracimchet分布与正弦Topp-Leone- g族积分得到的一种新的概率分布。所建议的模型最值得注意的特点是,它能够仅用三个参数就准确地表示各种各样的风险率模式(例如倒挂、倒j型、减少和增加)。它的密度也可能显示单峰、反j型和右倾斜的形状。我们为提议的分布提供了一些统计性质。使用16种不同的估计方法,我们估计了所建议模型的参数,并研究了它的一些分布特征。我们评估了所建议的模型的有效性,并使用蒙特卡罗模拟比较了各种参数估计的有效性。数值分析表明,Kolmogorov估计和二阶左尾Anderson-Darling估计在各种情况下都具有较好的效率和一致性。基于所有性能标准的总和,它们经常获得最高的总体排名,并始终如一地产生低偏差和均方误差的估计。此外,我们使用两个真实数据集评估了建议分布的适应性,证明了其精确拟合数据的卓越能力。根据我们的研究结果,建议的分布在拟合质量方面优于余切分布、奇指数对数分布、Topp-Leone分布、奇广义指数逆威布尔分布、广义逆威布尔分布、arctan逆威布尔分布、新arctan frsamet分布和frsamet分布。
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引用次数: 0
Structure-guided identification of novel natural antidiabetic inhibitors: Targeting glucoamylase from saccharomycopsis fibuligera 新型天然抗糖尿病抑制剂的结构引导鉴定:靶向纤维酵母菌的葡萄糖淀粉酶
IF 3.3 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2025-12-18 DOI: 10.1016/j.sciaf.2025.e03145
Oussama Abchir , Bouchra Rossafi , Rodouan Touti , Imane Yamari , Kasim Sakran Abass , Abdelouahid Samadi , Samir Chtita
Diabetes mellitus, a major metabolic disorder, affected approximately 537 million individuals worldwide in 2021, according to the International Diabetes Federation. The disease is associated with severe complications that impair various organs and significantly reduce patients' quality of life. Current pharmacological treatments for diabetes are often associated with adverse effects, including abdominal discomfort, bloating, and diarrhea. In previous studies, 52 medicinal plants from 22 plant families, including Apiaceae, Asteraceae, Fabaceae, and Lamiaceae, were identified as potential treatments for diabetes and other diseases. In the present study, we aimed to investigate the phytochemical composition of these plants, resulting in a collection of approximately 933 unique compounds after removing duplicates. Rigorous filtering based on Lipinski's Rule of Five yielded 844 compounds that met key drug-likeness criteria. To assess their therapeutic potential, molecular docking studies were performed to analyze the binding modes of these compounds with the Glucoamylase receptor, focusing on key interactions with the receptor’s active site. Acarbose, a well-established alpha-glucosidase inhibitor, was used as a reference drug to validate the docking protocol and benchmark the results. Subsequently, molecular dynamics simulations were conducted for the top four selected compounds and Acarbose to evaluate the stability and persistence of the receptor-ligand interactions over time. This in silico study offers valuable insights into the therapeutic potential of plant-derived compounds and supports the development of optimized glucoamylase inhibitors for diabetes management.
根据国际糖尿病联合会的数据,2021年,全球约有5.37亿人患有糖尿病,这是一种主要的代谢紊乱。该病伴有严重的并发症,损害各种器官并显著降低患者的生活质量。目前对糖尿病的药物治疗通常伴有不良反应,包括腹部不适、腹胀和腹泻。在以往的研究中,包括蜂科、菊科、豆科和兰科在内的22个科的52种药用植物被确定为治疗糖尿病和其他疾病的潜在药物。在本研究中,我们旨在研究这些植物的植物化学成分,从而在去除重复后收集了大约933种独特的化合物。基于利平斯基五法则的严格过滤产生了844种符合关键药物相似标准的化合物。为了评估它们的治疗潜力,进行了分子对接研究,分析了这些化合物与葡萄糖淀粉酶受体的结合模式,重点研究了与受体活性位点的关键相互作用。阿卡波糖是一种成熟的α -葡萄糖苷酶抑制剂,作为对照药物验证对接方案并对结果进行基准测试。随后,对前四种选定的化合物和阿卡波糖进行了分子动力学模拟,以评估受体-配体相互作用随时间的稳定性和持久性。这项硅研究为植物源性化合物的治疗潜力提供了有价值的见解,并支持开发用于糖尿病管理的优化葡萄糖淀粉酶抑制剂。
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引用次数: 0
A novel spatially enabled neural model for flood susceptibility in Northern Morocco 摩洛哥北部洪水易感性的一个新的空间神经模型
IF 3.3 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2025-12-18 DOI: 10.1016/j.sciaf.2025.e03148
Wassima Moutaouakil , Soufiane Hamida , Asmae Ouhmida , Oussama El Gannour , Bouchaib Cherradi , Abdelhadi Raihani
Flooding remains a major hazard in northern Morocco, where rapid urban growth and limited monitoring systems heighten the need for reliable flood susceptibility assessment. This study addresses this challenge by developing a Long Short-Term Memory (LSTM) Deep Learning (DL) model capable of predicting flood‐prone areas using satellite imagery and Geographic Information System (GIS) data. Eleven flood conditioning factors were incorporated, including elevation, slope, aspect, Stream Power Index (SPI), Topographic Position Index (TPI), Topographic Wetness Index (TWI), curvature, drainage density (DD), distance to rivers (DR), Normalized Difference Vegetation Index (NDVI), and land use (LU). Unlike previous studies relying on static GIS factors or traditional Machine Learning (ML) methods, this work evaluates how the influence of 11 conditioning factors varies across regions and tests the cross-regional transferability of the LSTM model. A balanced dataset of 1946 samples was generated through data augmentation, and optimization techniques were implemented to enhance model performance. The proposed model achieved an accuracy of 96.06 %, a precision of 94.56 %, a recall of 97.54 %, and an area under the Receiver Operating Characteristic (ROC) curve (AUC) of 96.10 %, confirming its strong predictive capability. These findings show that LSTM can accurately capture spatial environmental patterns linked to flood occurrence, offering valuable support for urban planning, early warning systems, and improved flood risk management in data-scarce regions.
洪水仍然是摩洛哥北部的一个主要灾害,在那里,快速的城市增长和有限的监测系统增加了对可靠的洪水易感性评估的需求。本研究通过开发长短期记忆(LSTM)深度学习(DL)模型来解决这一挑战,该模型能够使用卫星图像和地理信息系统(GIS)数据预测洪水易发地区。纳入了11个洪水调节因子,包括高程、坡度、坡向、河流功率指数(SPI)、地形位置指数(TPI)、地形湿度指数(TWI)、曲率、排水密度(DD)、河流距离(DR)、归一化植被指数(NDVI)和土地利用(LU)。与以往依赖静态GIS因素或传统机器学习(ML)方法的研究不同,这项工作评估了11个条件因素在不同地区的影响,并测试了LSTM模型的跨地区可转移性。通过数据扩充生成了一个包含1946个样本的平衡数据集,并利用优化技术提高了模型的性能。该模型的准确率为96.06%,精密度为94.56%,召回率为97.54%,受试者工作特征曲线下面积(AUC)为96.10%,具有较强的预测能力。这些发现表明,LSTM可以准确捕捉与洪水发生相关的空间环境格局,为数据稀缺地区的城市规划、预警系统和改善洪水风险管理提供有价值的支持。
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引用次数: 0
An empirical assessment of wild fauna species as critical ingredients for traditional curative therapy 野生动物物种作为传统治疗关键成分的实证评估
IF 3.3 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2025-12-17 DOI: 10.1016/j.sciaf.2025.e03144
B.S. OJELADE , W.A. JAYEOBA , J.B.O. OGOLA
Medicinal practices that incorporate animal parts can strengthen the relationships between people and wildlife. Although this practice is recognised as a positive use of wildlife for healing, the demand for animal-based healing remedies poses a threat to biodiversity. This research examines the use of wildlife for medicinal purposes in Kaduna Metropolis, Nigeria. It details the species, parts used, affected ailments, the intensity of the trade, and the trade's conservation status. This study was accomplished using structured questionnaires and interviews focused on six central markets, and later evaluated the species against the International Union for Conservation of Nature (IUCN) Red List and the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) regulations. Twenty-one species were noted, with 62 % of the trade mammals, 14.3 % birds, 14.3 % reptiles, 4.7 % fish, and 4.7 % amphibians. Python, Cane rat, and Black rat were the most frequently mentioned in the literature and in practical use. A high fidelity level of 100 % and an Informant Consensus Factor within the 0.95–1.00 range were strongly concordant with the positive, expected outcome of the remedies. Primary ethnomedicine was recorded as a trade motivator, accounting for 52 % of the justification for the trade, followed by religion at 9 % and food at 4 %. Overlapping factors were noted among all three motivators. Conservation evaluations revealed that 76 % of the assessed species were classified as Least Concern, 14 % as Near Threatened, and 5 % were classified as Vulnerable or Endangered. The study highlights the need for traditional medicine and the conservation of biodiversity. The study advocates for the need for sustainable management of resources, control and collaboration across disciplines, and education focused on reducing zoonoses and preserving wildlife, along with its cultural legacy.
结合动物器官的医疗实践可以加强人与野生动物之间的关系。尽管这种做法被认为是积极利用野生动物进行治疗,但对基于动物的治疗药物的需求对生物多样性构成了威胁。本研究考察了尼日利亚卡杜纳大都市药用野生动物的使用情况。它详细介绍了物种、使用的部位、受影响的疾病、贸易的强度以及贸易的保护状况。本研究采用结构化问卷调查和访谈的方式完成,主要集中在六个中心市场,随后根据国际自然保护联盟(IUCN)红色名录和《濒危野生动植物种国际贸易公约》(CITES)法规对该物种进行了评估。其中,哺乳动物占62%,鸟类占14.3%,爬行动物占14.3%,鱼类占4.7%,两栖动物占4.7%。蟒蛇、甘蔗鼠和黑鼠是文献和实际使用中最常提到的。100%的高保真度水平和0.95-1.00范围内的告密者共识因子与补救措施的积极预期结果强烈一致。主要的民族医药被记录为贸易动因,占贸易理由的52%,其次是宗教,占9%,食品占4%。在这三个激励因素中发现了重叠的因素。保护评估显示,76%的被评估物种被分类为“最不受关注”,14%被分类为“近危”,5%被分类为“易危”或“濒危”。这项研究强调了传统医学和保护生物多样性的必要性。该研究倡导需要对资源进行可持续管理、跨学科控制和合作,以及侧重于减少人畜共患病和保护野生动物及其文化遗产的教育。
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引用次数: 0
Life cycle and Techno-economic sensitivity analysis of a solar-assisted heat pump dryer integrated with thermal energy storage for drying tomato slices 太阳能热泵蓄热干燥机用于番茄片干燥的生命周期及技术经济敏感性分析
IF 3.3 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2025-12-17 DOI: 10.1016/j.sciaf.2025.e03138
Aldé Belgard Tchicaya Loemba , Baraka Kichonge , Thomas Kivevele
In Africa, tray dryers and open sun dryers are commonly used to dry tomato slices. However, these traditional drying methods expose the products to significant risks of microbial contamination. Moreover, they often fail to effectively retain the nutritional content of the dried tomatoes, and the drying process itself can be quite time-consuming. Given these drawbacks, there is a pressing need to explore alternative drying solutions. This study proposes a solar-assisted heat pump dryer integrated with thermal energy storage, utilizing soapstone as the storage material for drying tomato slices. The study places particular emphasis on conducting an integrated techno-economic sensitivity analysis and life cycle assessment, addressing a significant gap that has been largely overlooked in previous studies focused on heat pump drying technology. Experiments were conducted to study the drying of 1000 g of tomato slices in two modes: Mode 1 with storage and Mode 2 without storage. Results of the coefficient of performance showed that Mode 1 was 37.4 % more efficient than Mode 2. Results also revealed that Mode 2 dried 22.22 % slower than Mode 1. Results of the life cycle assessment conducted with OpenLCA under the impact assessment technique ReCiPe 2016 revealed that the drying process using the proposed dryer has negligible impacts on the environment. The economic analysis performed showed a payback period of 1.5 years and a return on investment of 67.63 %. Sensitivity analysis showed that changes in economic variables affect profitability. Thus, the proposed dryer is a cost-effective, eco-friendly, and effective method for drying tomato slices.
在非洲,托盘烘干机和开放式太阳烘干机通常用于干燥番茄片。然而,这些传统的干燥方法使产品暴露于微生物污染的重大风险中。此外,它们往往不能有效地保留干番茄的营养成分,而且干燥过程本身可能相当耗时。鉴于这些缺点,迫切需要探索替代干燥解决方案。本研究提出一种结合热能储存的太阳能热泵干燥机,利用皂石作为储存材料干燥番茄片。该研究特别强调进行综合技术经济敏感性分析和生命周期评估,解决了在以前的热泵干燥技术研究中很大程度上被忽视的重大差距。对1000g番茄片进行了两种干燥方式的试验研究:模式1有贮藏和模式2无贮藏。性能系数结果表明,模式1比模式2效率高37.4%。结果还表明,模式2比模式1干燥速度慢22.22%。在影响评估技术ReCiPe 2016下使用OpenLCA进行的生命周期评估结果显示,使用所提出的干燥器的干燥过程对环境的影响可以忽略不计。经济分析表明,投资回收期为1.5年,投资回报率为67.63%。敏感性分析表明,经济变量的变化会影响盈利能力。因此,所提出的干燥机是一种经济、环保、有效的干燥番茄片的方法。
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引用次数: 0
Synthesis, cytotoxicity, and molecular docking studies of novel selenourea-embedded quinoline and benzimidazole derivatives against MDA-MB-231 and A549 cancer cell lines 新型硒脲包埋喹啉和苯并咪唑衍生物对MDA-MB-231和A549癌细胞的合成、细胞毒性和分子对接研究
IF 3.3 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2025-12-17 DOI: 10.1016/j.sciaf.2025.e03141
Ziad Moussa , Mani Ramanathan , Nael Abutaha , Abedalqader Abuhussein , Haythem A. Saadeh , Harbi Tomah Al-Masri , Asma Ali Salim Almazrouei , Laila Ali Holais Alneyadi , Shaikha Hamad Obaid Alshehhi , Saleh A. Ahmed
Development of hybrid molecules has been broadly considered one of the promising strategies towards cancer treatment owing to their unique modes of action on various cell lines. Herein, we describe the synthesis of novel libraries of selenourea-heterocyclic amine hybrids and their in vitro anticancer activities against MDA-MB-231 (breast cancer) and A549 (lung cancer) targets. A selenourea moiety was merged with two distinct heterocyclic amines: 5-(piperazin-1-ylmethyl)quinolin-8-ol (series-1) and 2-(piperazin-1-yl)-1H-benzo[d]imidazole (series-2). A total of 18 derivatives were synthesized and fully characterized using NMR, FT-IR, and Mass spectrometry. Preliminary in vitro anticancer activity evaluation revealed that few selenourea derivatives exhibited significant potency. Among the tested compounds, 18e from series-2 displayed the most potent activity against triple-negative MDA-MB-231 invasive ductal carcinoma breast cancer cells (IC₅₀ = 13.9 μM), whereas 18f emerged as the most potent against the human lung carcinoma (A549) cell lines with an IC₅₀ value of 17.6 μM. In series-1, 17i showed notable efficacy against A549 cells (IC₅₀ = 22.5 μM) and invasive ductal carcinoma breast cancer cells MDA-MB-231 (IC₅₀ = 37.9 μM). Morphological changes in MDA-MB-231 cells upon treatment with 18e, 18d and 18f were investigated by light microscopy analysis. The differential binding free energy (ΔΔG) was used to compare the relative binding strengths of compound 18e with the reference ligands. Negative ΔΔG values for NR3C1 (−1.66 kcal/mol) and MAPK8 (−0.52 kcal/mol) indicated stronger interactions and enhanced complex stability, whereas moderate positive values for STAT3, MAPK1, and BCL2L1 suggested promising but comparatively weaker affinities relative to the controls.
由于杂交分子在多种细胞系上具有独特的作用模式,因此被广泛认为是治疗癌症的有前途的策略之一。在此,我们描述了新的硒脲-杂环胺杂合体文库的合成及其对MDA-MB-231(乳腺癌)和A549(肺癌)靶点的体外抗癌活性。硒脲部分与两种不同的杂环胺合并:5-(哌嗪-1-基甲基)喹啉-8-醇(系列-1)和2-(哌嗪-1-基)- 1h -苯并咪唑(系列-2)。共合成了18个衍生物,并利用NMR、FT-IR和质谱对其进行了表征。初步的体外抗癌活性评价显示,很少有硒脲衍生物表现出显著的效力。在所测试的化合物中,来自系列2的18e对三阴性MDA-MB-231浸润性导管癌乳腺癌细胞(IC₅₀= 13.9 μM)显示出最有效的活性,而18f对人类肺癌(A549)细胞系最有效,IC₅₀值为17.6 μM。在系列-1中,17i对A549细胞(IC₅₀= 22.5 μM)和浸润性导管癌乳腺癌细胞MDA-MB-231 (IC₅₀= 37.9 μM)表现出显着的功效。光镜下观察18e、18d和18f对MDA-MB-231细胞的影响。利用差分结合自由能(ΔΔG)比较化合物18e与参考配体的相对结合强度。NR3C1 (- 1.66 kcal/mol)和MAPK8 (- 0.52 kcal/mol)的负ΔΔG值表明相互作用更强,复合物稳定性增强,而STAT3、MAPK1和BCL2L1的中等阳性值表明相对于对照组有希望但相对较弱的亲和力。
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Scientific African
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