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Therapeutic potential of Zanha africana (Radlk.) Exell: antimycobacterial activity and safety evaluation Zanha africana (Radlk.) Exell 的治疗潜力:抗霉菌活性和安全性评估
IF 2.7 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-09-19 DOI: 10.1016/j.sciaf.2024.e02371
Alphonce Ignace Marealle , Michael Qwarse , Ramadhani S.O. Nondo , Alex John Bulashi , Francis Machumi , Alfredi Alfred Moyo , Joseph Sempombe , Paul Malaba , Matthias Heydenreich , Rogers Mwakalukwa , Matobola Joel Mihale , Mainen Julius Moshi

Background

Zanha africana (Radlk.) Exell extracts are commonly utilized in Tanzania and other countries for treating conditions associated with HIV and AIDS, including tuberculosis (TB). In Tanzania, it is listed among the most frequently traded plant species for medicinal use in different marketplaces. However, limited literature exists regarding its antimycobacterial properties and safety profile.

Objective

This study aimed to evaluate Z. africana ethanolic extract for safety and antimycobacterial activity.

Methods

The antimycobacterial activity of the crude extracts was assessed using the broth microdilution method against various non-pathogenic mycobacteria strains including Mycobacterium aurum (MA), Mycobacterium madagascariense (MM), and Mycobacterium indicus pranii (MIP). Bioassay-guided fractionation was employed to isolate the active compounds. The safety profile of the crude extract was investigated through cytotoxicity assay on peripheral blood mononuclear cells (PBMCs) and the brine shrimp lethality test.

Results

The 80% ethanolic extracts of Z. africana demonstrated activity against all tested non-pathogenic mycobacteria. The antimycobacterial activity of ethanolic extract of the stem bark was 625 µg/mL, 313 µg/mL and 125 µg/mL against MA, MM, and MIP, respectively. The most potent fraction was the ethyl acetate fraction, from which two active compounds were isolated: proanthocyanidin A2; Compound (1) and its monomer epicatechin, Compound (2). Compound (1) exhibited higher antimycobacterial activity compared to compound (2) with minimum inhibitory concentrations (MICs) of 19.50 µg/mL and 12.98 µg/mL against MM and MIP respectively. The ethanolic extract did not demonstrate toxicity on PBMCs and brine shrimps.

Conclusion

This study demonstrates that Z. africana extracts and the isolated compounds possess antimycobacterial activity. This provides evidence supporting the traditional use of Z. africana extracts for TB management. Further research is recommended to comprehensively evaluate the efficacy and safety of the plant constituents using different models.
背景Zanha africana (Radlk.) Exell 的提取物在坦桑尼亚和其他国家通常用于治疗与艾滋病毒和艾滋病有关的疾病,包括肺结核(TB)。在坦桑尼亚,它被列为不同市场上交易最频繁的药用植物品种之一。本研究旨在评估非洲杉乙醇提取物的安全性和抗霉菌活性。方法采用肉汤微稀释法评估了粗提取物对各种非致病分枝杆菌菌株(包括金黄分枝杆菌(MA)、马达加斯加分枝杆菌(MM)和indicus pranii分枝杆菌(MIP))的抗分枝杆菌活性。采用生物测定指导分馏法分离出活性化合物。通过外周血单核细胞(PBMCs)细胞毒性试验和盐水虾致死试验研究了粗提取物的安全性。茎皮乙醇提取物对 MA、MM 和 MIP 的抗霉菌活性分别为 625 µg/mL、313 µg/mL 和 125 µg/mL。乙酸乙酯萃取物是最有效的萃取物,从中分离出两种活性化合物:原花青素 A2;化合物 (1) 及其单体表儿茶素,化合物 (2)。与化合物(2)相比,化合物(1)表现出更高的抗霉菌活性,对 MM 和 MIP 的最低抑制浓度(MICs)分别为 19.50 µg/mL 和 12.98 µg/mL。乙醇提取物对 PBMCs 和盐水虾没有毒性。这为传统上使用非洲杉提取物治疗结核病提供了证据支持。建议开展进一步研究,利用不同模型全面评估植物成分的有效性和安全性。
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引用次数: 0
A comprehensive review on medicinal plant extracts as antibacterial agents: Factors, mechanism insights and future prospects 关于药用植物提取物作为抗菌剂的全面综述:因素、机理见解与未来前景
IF 2.7 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-09-19 DOI: 10.1016/j.sciaf.2024.e02395
Nouhaila Zouine, Naima El Ghachtouli, Soumya El Abed, Saad Ibnsouda Koraichi
Antibiotic resistance, once a manageable concern, has now emerged as one of the most pressing global health threats. In response, there is a growing scientific focus on discovering natural and effective antimicrobial agents. In this review, we aim to address this urgent issue by summarizing recent studies from 2014 to 2024 on medicinal plant extracts exhibiting minimum inhibitory concentrations (MIC) equal to or less than 625 µg/mL. We explore the key factors influencing the antibacterial efficacy of these extracts and provide an in-depth overview of their mechanisms of action. Systematic literature searches were collected from scientific databases, documenting 81 plant species tested against multiple pathogenic bacteria. The results revealed that extracts from Quercus coccifera, Ocimum gratissimum, and Curcuma longa, demonstrated the highest efficacy against the most commonly targeted pathogens, including Pseudomonas aeruginosa (MIC of 4 µg/mL), Staphylococcus aureus (MIC of 5 µg/mL), and Escherichia coli (MIC of 7.58 µg/mL), respectively. The Myrtaceae, Lamiaceae, Apiaceae families demonstrated the highest potency, with Cameroon, Indonesia, and South Africa recognized as primary regions for plant collection. Leaves (50.56 %) were the primary plant parts investigated, with methanol (31.16 %) and ethanol (20.28 %) being the most commonly used solvents in extraction processes. This review not only underscores the significant antibacterial potential of plant extracts but also elucidates how phytochemical composition, extraction methods, and antibacterial screening techniques contribute to their efficacy. This integrative study provides a robust foundation for future research and highlights the promise of plant-based solutions in combating antibiotic resistance.
抗生素耐药性曾经是一个可以控制的问题,但现在已成为最紧迫的全球健康威胁之一。为此,科学界越来越重视发现天然有效的抗菌剂。在这篇综述中,我们总结了从 2014 年到 2024 年有关药用植物提取物的最新研究,这些提取物的最低抑菌浓度(MIC)等于或低于 625 µg/mL,旨在解决这一紧迫问题。我们探讨了影响这些提取物抗菌功效的关键因素,并深入概述了它们的作用机制。我们从科学数据库中收集了系统的文献检索,记录了针对多种病原菌测试的 81 种植物。结果显示,柞树、欧莳萝和莪术的提取物对最常见的目标病原体具有最高的疗效,包括铜绿假单胞菌(MIC 为 4 µg/mL)、金黄色葡萄球菌(MIC 为 5 µg/mL)和大肠杆菌(MIC 为 7.58 µg/mL)。桃金娘科(Myrtaceae)、茜草科(Lamiaceae)和繖形花科(Apiaceae)的药效最高,喀麦隆、印度尼西亚和南非是主要的植物采集地区。叶(50.56%)是调查的主要植物部分,甲醇(31.16%)和乙醇(20.28%)是萃取过程中最常用的溶剂。这篇综述不仅强调了植物萃取物的巨大抗菌潜力,还阐明了植物化学成分、萃取方法和抗菌筛选技术是如何促进植物萃取物发挥功效的。这项综合性研究为今后的研究奠定了坚实的基础,并凸显了以植物为基础的解决方案在抗击抗生素耐药性方面的前景。
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引用次数: 0
Optimizing Spatial Complexity of the Hard Decision Decoder Based on Hash and Syndrome Decoding (HSDec) 基于哈希和症候解码(HSDec)优化硬解码器的空间复杂性
IF 2.7 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-09-18 DOI: 10.1016/j.sciaf.2024.e02383
Seddiq El Kasmi Alaoui , Tarik Chanyour , Hamza Faham , Said Nouh
In this article, we propose an optimized version of the Hard Decision Decoder based on Hash and Syndrome Decoding (HSDec) decoder, named Reduced Memory Space of HSDec (RMS-HSDec), which uses less memory space. In this article, we aim to reduce the spatial complexity of the HSDec decoding algorithm while preserving its error correction capabilities. Our methodology involves allocating only the essential memory space for correctable error patterns and optimizing the hashing mechanism to effectively handle potential collisions. While maintaining the integrity of error correction, this new method guarantees memory reduction rates of over 96 % for the BCH(63, 39, 9) code and over 84 % for the QR(47, 24, 11) code compared to HSDec. Simulations were conducted to evaluate the performance of RMS-HSDec on various BCH and QR codes over AWGN and Rayleigh channels. The results demonstrated significant memory reduction rates and coding gains ranging from 0.8 dB to 2.8 dB over the AWGN channel and from 14 dB to 32 dB over the Rayleigh channel, confirming the robustness of the algorithm under different channel conditions. Comparative analyses showed that RMS-HSDec maintains competitive performance with existing decoders while offering effective error correction. These findings confirm the robustness of the RMS-HSDec algorithm under different channel conditions. Overall, the proposed decoder proves to be an effective solution, optimizing memory usage without compromising error correction capabilities, making it ideal for high-density data applications and environments with limited memory resources.
在本文中,我们提出了一种基于哈希和症候解码(HSDec)解码器的优化版本,命名为减少内存空间的 HSDec(RMS-HSDec),它使用更少的内存空间。本文旨在降低 HSDec 解码算法的空间复杂性,同时保留其纠错能力。我们的方法包括只为可纠错模式分配必要的内存空间,并优化哈希机制以有效处理潜在的碰撞。与 HSDec 相比,这种新方法在保持纠错完整性的同时,保证 BCH(63, 39, 9) 码的内存减少率超过 96%,QR(47, 24, 11) 码的内存减少率超过 84%。 仿真评估了 RMS-HSDec 在 AWGN 和瑞利信道上对各种 BCH 码和 QR 码的性能。结果表明,在 AWGN 信道上,内存减少率和编码增益明显,从 0.8 dB 到 2.8 dB 不等,在瑞利信道上从 14 dB 到 32 dB 不等,证实了该算法在不同信道条件下的鲁棒性。对比分析表明,RMS-HSDec 在提供有效纠错的同时,其性能与现有解码器相比仍具有竞争力。这些发现证实了 RMS-HSDec 算法在不同信道条件下的鲁棒性。总体而言,所提出的解码器被证明是一种有效的解决方案,在优化内存使用的同时不影响纠错能力,因此非常适合高密度数据应用和内存资源有限的环境。
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引用次数: 0
“Impacts of neo-banks on North African migrants’ remittances and financial inclusion” "新银行对北非移民汇款和金融包容性的影响"
IF 2.7 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-09-18 DOI: 10.1016/j.sciaf.2024.e02384
Abdeslam Badre
This study examined remittance trends and financial institution preferences among North African migrants in Europe and assessed neobanks' potential to foster financial inclusion and cost reductions. The main objetive was to explore how neobanks can alleviate economic pressures on North African migrants and help achieve the World Bank Group's goal of reducing remittance costs to 5 % and the UN-SDG target of 3 %. Exploratory in nature, both surveys and interviews were used for data collection. The sample consisted of 64 North African migrants from Morocco, Tunisia, and Algeria (North Africa) residing in France, Spain, and Italy (EU). Key findings revealed that North African migrants had diverse remittance behaviors, with varying frequencies and amounts sent home. Trust in traditional banks remained high due to familiarity, cultural norms, and accessibility issues in rural areas. However, neobanks offered significant cost savings, with potential annual savings ranging from €30 to €134 depending on the monthly remitted amount that ranges between a €100 and a €1000 . Adoption of neobanks was higher among younger, and digitally literate migrants with better access to technology. Barriers to wider adoption of neobanks included limited digital and financial literacy, lack of necessary technology in home countries, and cultural resistance to change. High regulatory and compliance costs for traditional banks also contributed to inflated remittance fees. To address these issues, the paper recommends enhancing market competition, improving access to new payment technologies, encouraging larger remittances through incentives, learning from successful public bank models like France's La Banque Postale, and fostering financial literacy and digital inclusion. Additionally, it suggests building trust and cultural sensitivity, investing in robust cybersecurity measures, and developing offline transaction capabilities to increase accessibility for migrants in remote areas.
本研究考察了欧洲北非移民的汇款趋势和金融机构偏好,并评估了新银行在促进金融包容性和降低成本方面的潜力。主要目的是探讨新银行如何减轻北非移民的经济压力,并帮助实现世界银行集团将汇款成本降至 5% 的目标和联合国可持续发展小组将汇款成本降至 3% 的目标。数据收集采用了调查和访谈两种方式,具有探索性。样本包括 64 名居住在法国、西班牙和意大利(欧盟)的北非移民,他们分别来自摩洛哥、突尼斯和阿尔及利亚(北非)。主要调查结果显示,北非移民的汇款行为多种多样,汇款频率和金额也各不相同。由于熟悉程度、文化规范以及农村地区的交通问题,人们对传统银行的信任度仍然很高。然而,新银行可以节省大量成本,根据每月 100 欧元至 1000 欧元不等的汇款金额,每年可节省 30 欧元至 134 欧元。新银行在更年轻、更懂数字技术、更容易获得技术的移民中的采用率更高。更广泛地采用新银行的障碍包括:数字和金融知识有限、母国缺乏必要的技术以及文化上对变革的抵制。传统银行高昂的监管和合规成本也导致汇款费用膨胀。为解决这些问题,论文建议加强市场竞争,改善新支付技术的使用,通过激励措施鼓励更大规模的汇款,学习法国邮政银行等成功的公共银行模式,并促进金融扫盲和数字包容。此外,报告还建议建立信任和文化敏感性,投资于强大的网络安全措施,开发离线交易能力,以提高偏远地区移民的可及性。
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引用次数: 0
GIS-based multi-criteria approach for ranking suitable areas for the implementation of PV-Powered MCDI desalination plants in the Rheris Watershed, Southeast Morocco 采用基于地理信息系统的多标准方法,对摩洛哥东南部 Rheris 流域实施光伏发电 MCDI 海水淡化厂的合适区域进行排序
IF 2.7 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-09-18 DOI: 10.1016/j.sciaf.2024.e02396
Ismail Ait Lahssaine , Badre Messaoudi , Lahcen Kabiri , Abdelhakim Kadiri , Badre Essafraoui , Edgardo Cañas Kurz , Ulrich Hellriegel , Jan Hoinkis

In Morocco's oases, which rely heavily on surface water from mountain sources, the threat of decreasing rainfall presents a significant challenge, leading to a decline in surface water availability. This study focuses on the Rheris Watershed in Southeast Morocco, where brackish water desalination emerges as a viable alternative to ensure sustainable water supply for agriculture. Prior to the deployment of a pilot plant integrating a desalination unit, selecting an optimal site for PV-powered MCDI desalination plants was critical. This selection was based on a range of criteria, including Groundwater Quantity, Global Horizontal Irradiation, Temperature, Evaporation, Water Salinity, Water Quantity, Well Density and Slope. These criteria were evaluated using a combination of the Analytical Hierarchy Process (AHP), and geospatial data obtained from Remote Sensing (RS) and Geographic Information System (GIS) techniques.

This case study in the Rheris watershed identified potential sites for future Membrane Capacitive Deionization (MCDI) desalination projects, High suitability areas encompass 280.45 km² (30.91 %), located west of Tinejdad, Khettarat Moulay Hachem, north of Goulmima, and south of Tinghir. Low suitability areas cover 63.75 km² (7.02 % of the study area), including regions south of Tadighoust and Tinejdad. Moderate suitability areas span 562.86 km² (62.05 %), involving central regions of Goulmima, Tadighoust, Tinejdad, and Tinghir. Based on the results of the study, the recommendations include focusing on areas identified as highly suitable for MCDI technology for sustainable agriculture, refining selection criteria based on local data, exploring brine management strategies, and adopting integrated water management approaches to ensure sustainable resource use.

摩洛哥的绿洲严重依赖山区的地表水,降雨量减少的威胁带来了巨大挑战,导致地表水供应量下降。本研究的重点是摩洛哥东南部的 Rheris 流域,在该地区,咸水淡化成为确保农业可持续供水的可行替代方案。在部署集成海水淡化装置的试点工厂之前,为光伏供电的 MCDI 海水淡化工厂选择最佳地点至关重要。这一选择基于一系列标准,包括地下水量、全球水平辐照、温度、蒸发、水盐度、水量、水井密度和坡度。对这些标准的评估结合使用了层次分析法(AHP)以及从遥感(RS)和地理信息系统(GIS)技术中获得的地理空间数据。这项在雷里斯流域进行的案例研究为未来的膜电容去离子(MCDI)海水淡化项目确定了潜在的地点,高适宜性区域包括 280.45 平方公里(30.91%),位于 Tinejdad 以西、Khettarat Moulay Hachem、Goulmima 以北和 Tinghir 以南。低适宜性区域面积为 63.75 平方公里(占研究区域的 7.02%),包括塔迪格乌斯特和蒂内贾达德以南地区。中度适宜区面积为 562.86 平方公里(62.05%),包括中部的古利马、塔迪格乌斯特、蒂内杰达德和廷希尔地区。根据研究结果提出的建议包括:将重点放在已确定为非常适合采用可持续农业的水合作与可持续发展技术的地区,根据当地数据完善选择标准,探索盐水管理战略,以及采用综合水管理方法确保资源的可持续利用。
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引用次数: 0
Engineering geological investigation of Gololcha dam for evaluation of leakage and abutment slope stability, Eastern Ethiopia 为评估埃塞俄比亚东部 Gololcha 大坝的渗漏和坝基边坡稳定性而进行的工程地质调查
IF 2.7 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-09-18 DOI: 10.1016/j.sciaf.2024.e02381
Sishaw Merdassa , Tola Garo , Yadeta C. Chemeda , Shankar Karuppannan , Mahlet Tesfaye
The Ethiopian economy is primarily dependent on agriculture, making the construction of water harvesting facilities, such as dams, crucial for improving the productivity of this sector. The ongoing construction of the Gololcha dam on the Kurkura River located in Eastern Ethiopia aims to enhance irrigation schemes in the region. However, the dam site's complex geological and structural conditions pose challenges related to leakage and slope instability. Hence, this study focuses on addressing the abutment slope stability and leakage condition of this dam. This study employed kinematic analysis and the Limit Equilibrium Method (LEM) to assess slope stability. Additionally, engineering geological mapping, discontinuity surveys, seismic refraction tomography (SRT), and in-situ permeability testing were used to evaluate the leakage condition of the dam site. Notably, the permeability and SRT survey results identified potential leakage zones to the depth of 35, 30, and 35 m at the left, right, and central foundations of the dam, respectively. The kinematic method revealed one planar and two wedge modes of failure in the slope section covered by slightly weathered and fractured basalt rock at the right abutment. Further stability analysis of these two modes of failures via LEM analysis indicated slope instability under saturated conditions, emphasizing the role of pore water pressure. Furthermore, LEM modeling was directly utilized using the Slide 6.0 software to analyze the slope stability condition of the left abutment of the dam. This modeling also uncovered instability under saturated conditions. Based on the study findings, this study recommended curtain grouting to address potential leakage, as well as slope flattening and removing unstable rock wedges and loose material to stabilize unstable slope sections.
埃塞俄比亚的经济主要依赖农业,因此建造水坝等集水设施对于提高农业生产率至关重要。正在埃塞俄比亚东部库尔库拉河上修建的 Gololcha 大坝旨在加强该地区的灌溉计划。然而,坝址复杂的地质和结构条件带来了与渗漏和斜坡不稳定性有关的挑战。因此,本研究重点关注该大坝的坝基边坡稳定性和渗漏状况。本研究采用运动分析和极限平衡法(LEM)来评估边坡稳定性。此外,还采用了工程地质测绘、不连续性勘测、地震折射断层扫描(SRT)和原位渗透性测试来评估坝址的渗漏状况。值得注意的是,渗透性和 SRT 勘测结果表明,大坝左、右和中央地基的潜在渗漏区深度分别为 35 米、30 米和 35 米。运动学方法显示,在右侧坝基被轻微风化和断裂的玄武岩覆盖的斜坡部分,存在一种平面溃坝模式和两种楔形溃坝模式。通过 LEM 分析法对这两种破坏模式进行的进一步稳定性分析表明,边坡在饱和条件下不稳定,强调了孔隙水压力的作用。此外,还使用 Slide 6.0 软件直接利用 LEM 模型分析了大坝左侧支墩的边坡稳定性状况。该模型还揭示了饱和条件下的不稳定性。根据研究结果,本研究建议采用帷幕灌浆法来解决潜在的渗漏问题,并对斜坡进行平整,清除不稳定的岩楔和松散材料,以稳定不稳定的斜坡部分。
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引用次数: 0
Multi-criteria decision-based hybrid energy selection system using CRITIC weighted CODAS approach 使用 CRITIC 加权 CODAS 方法的基于多标准决策的混合能源选择系统
IF 2.7 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-09-18 DOI: 10.1016/j.sciaf.2024.e02372
Olumuyiwa Taiwo Amusan , Nnamdi Ikechi Nwulu , Saheed Lekan Gbadamosi
A complex and multicriteria decision making (MCDM) problem arises in a bid to select the most appropriate hybrid energy system among several combinations in distributed electricity generation as it involves conflicting criteria that must be simultaneously considered. In this work, Criteria Importance Through Intercriteria Correlation (CRITIC) along with Combinative Distance-Based Assessment (CODAS) was employed to select a suitable hybrid energy system combination for water pumping from four conflicting alternatives of Biomass-Battery (S1), PV-Battery (S2), PV-Biomass (S3), and PV-Biomass-Battery (S4) by objective weight estimation. This was followed by a confirmation by the Additive Ratio Assessment (ARAS) method for the solution. The results presented show that CRITIC method reveals 0.275, 0.224, 0.248, and 0.252 as different weights of the four alternatives of S1, S2, S3, and S4, respectively. The ranking results reveal S4 as the best alternative based on an assessment score of 0.4693. The same hybrid system was confirmed by ARAS based on overall performance and degree of utility of 0.287697 and 0.823716, respectively.
在分布式发电过程中,要从多个组合中选择最合适的混合能源系统,会出现一个复杂的多标准决策(MCDM)问题,因为它涉及到必须同时考虑的相互冲突的标准。在这项工作中,采用了 "通过标准间相关性确定标准重要性"(CRITIC)和 "基于组合距离的评估"(CODAS),通过客观权重估算,从生物质-电池(S1)、光伏-电池(S2)、光伏-生物质(S3)和光伏-生物质-电池(S4)这四个相互冲突的备选方案中,选择一个合适的混合能源系统组合用于抽水。随后,采用加法比率评估(ARAS)方法对解决方案进行了确认。结果显示,CRITIC 方法显示 S1、S2、S3 和 S4 四个备选方案的不同权重分别为 0.275、0.224、0.248 和 0.252。排序结果显示,S4 是最佳选择,评估得分为 0.4693。基于 0.287697 和 0.823716 的总体性能和实用程度,ARAS 确认了相同的混合系统。
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引用次数: 0
The impact of river sand mining and waste management on the Volta Lake: A case study of Asutsuare 河砂开采和废物管理对沃尔特湖的影响:阿苏图阿雷案例研究
IF 2.7 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-09-18 DOI: 10.1016/j.sciaf.2024.e02359
Daniel Kwaku Amoah , Esi Awuah , Isaac O.A. Hodgson , Miriam Appiah-Brempong , Elizabeth Von-Kiti , Isaac Nii Yartey Nyarko
The safety of drinking water is becoming more crucial as the world's population is increasing and anthropogenic activities which pollute water resources are intensifying. This study was carried out between June and August of 2022 to determine the physicochemical and microbial parameters of the Volta Lake at Asutsuare due to sand mining activities and to evaluate how well coconut husk biochar could remove these contaminants. Water samples were taken from one meter below the surface at the upstream, midstream (sand mining site) and downstream once a week for three months. Water samples from the midstream were passed through a coconut husk biochar column to determine its ability to remove pollutants in the water samples. Compared to the upstream, there was a significant difference (p < 0.05) in colour, turbidity, iron, manganese, biochemical oxygen demand, chemical oxygen demand, total coliform and total suspended solids from the water sampled from the midstream and downstream sites. Moreover, these values also exceeded the WHO guidelines. There were no significant differences (p > 0.05) between the midstream, the upstream and downstream sampling sites for the following parameters: zinc, lead, copper, conductivity, TDS, temperature, faecal coliform, Escherichia coli and pH. Biochar from coconut husk was used once and seems to be a highly effective sorbent for removing pollutants from water samples (>70 % removal efficiency).
随着世界人口的不断增长和人类活动对水资源污染的加剧,饮用水的安全变得越来越重要。这项研究是在 2022 年 6 月至 8 月期间进行的,目的是确定阿苏特苏阿雷的沃尔特湖因采砂活动而产生的物理化学和微生物参数,并评估椰糠生物炭去除这些污染物的效果。水样从上游、中游(采沙场)和下游水面下一米处采集,每周一次,持续三个月。中游的水样通过椰壳生物炭柱,以确定其去除水样中污染物的能力。与上游相比,中游和下游的水样在色度、浑浊度、铁、锰、生化需氧量、化学需氧量、总大肠菌群和总悬浮固体方面存在显著差异(p < 0.05)。此外,这些数值也超过了世界卫生组织的指导标准。中游、上游和下游采样点的以下参数无明显差异(p > 0.05):锌、铅、铜、电导率、总悬浮固体含量、温度、粪大肠菌群、大肠杆菌和 pH 值。椰子壳生物炭被使用过一次,似乎是去除水样中污染物的高效吸附剂(去除率为 70%)。
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引用次数: 0
Corrigendum to: A combined administration of GABA agonist and L-histidine synergistically alleviates obesity-induced neuro-lipotoxicity and distorted metabolic transcriptome [Scientific African 24 (2024) e02177] 更正:联合使用GABA激动剂和L-组氨酸可协同缓解肥胖引起的神经脂肪毒性和代谢转录组扭曲 [Scientific African 24 (2024) e02177]
IF 2.7 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-09-18 DOI: 10.1016/j.sciaf.2024.e02347
Esam S. Al-Malki , Omar A. Ahmed-Farid , Mahmoud M.A. Moustafa , Shimaa A. Haredy , Omnia A. Badr , Nesreen Nabil Omar , Robert J. Linhardt , Mohamad Warda
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引用次数: 0
Revisiting the effect of information and communication technologies on employment growth in Ghana: The role of enterprise formality 重新审视信息和通信技术对加纳就业增长的影响:企业正规化的作用
IF 2.7 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-09-18 DOI: 10.1016/j.sciaf.2024.e02394
Xiaolan Fu , Elvis Korku Avenyo
The employment effect of information and communication technologies (ICT) on firm performance remains a critical topic for policy and academic research. However, our understanding of the ICT-employment growth relationship in both informal and formal sectors in developing countries remains limited. Based on repeated cross-sectional data collected in 2013 and 2015 on 483 Ghanaian manufacturing enterprises and estimating a Feasible Generalised Least Squares (FGLS) regression model, the findings show that access to the internet leads to employment growth in enterprises, while the adoption of mobile phone technologies reduces the number of workers in enterprises. The positive effect of internet access on employment growth tends to be greater in enterprises with a higher degree of formality, while informal enterprises appear to remain small in terms of employment by using internet technology. We discuss these findings and their implications for digital technology policy in developing countries.
信息和通信技术(ICT)对企业绩效的就业影响仍然是政策和学术研究的一个重要课题。然而,我们对发展中国家非正规和正规部门的 ICT 与就业增长关系的了解仍然有限。基于 2013 年和 2015 年收集的 483 家加纳制造业企业的重复横截面数据,并通过可行的广义最小二乘法(FGLS)回归模型进行估计,研究结果表明,互联网的接入会导致企业的就业增长,而手机技术的采用则会减少企业的工人数量。在正规程度较高的企业中,互联网接入对就业增长的积极影响往往更大,而非正规企业通过使用互联网技术似乎仍能保持较小的就业规模。我们将讨论这些发现及其对发展中国家数字技术政策的影响。
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