Natural clay based adsorbent for defluoridation of groundwater: optimization of adsorption conditions

Groundwater is the most appropriate and widely used source of drinking water for many rural communities in Sub-Saharan Africa

Evidence of Yersinia pestis DNA from fleas in an endemic plague area of Zambia

BACKGROUND: Yersinia pestis is a bacterium that causes plague which infects a variety of mammals throughout the world. The disease is usually transmitted among wild rodents through a flea vector. The sources and routes of transmission of plague are poorly researched in Africa, yet remains a concern in several sub-Saharan countries. In Zambia, the disease has been reported on annual basis with up to 20 cases per year, without investigating animal reservoirs or vectors that may be responsible in the maintenance and propagation of the bacterium. In this study, we undertook plague surveillance by using PCR amplification of the plasminogen activator gene in fleas. FINDINGS: Xenopsylla species of fleas were collected from 83 rodents trapped in a plague endemic area of Zambia. Of these rodents 5 had fleas positive (6.02%) for Y. pestis plasminogen activator gene. All the Y. pestis positive rodents were gerbils. CONCLUSIONS: We conclude that fleas may be responsible in the transmission of Y. pestis and that PCR may provide means of plague surveillance in the endemic areas of Zambia

A framework for librarians to inform the citizenry during disasters : reflections on the COVID-19 pandemic

Globally, the coronavirus disease 2019 (COVID-19) has wreaked havoc on human lives and socio-economic activities at an unimaginable scale. African countries have not been spared from this debacle – as evidenced by media reports of loss of lives, lockdown, isolation and desolation coupled with loss of livelihood. Whilst the COVID-19 pandemic rages, libraries find themselves at the epicentre of an unprecedented crisis in the form of an information deluge that requires a multi-thronged approach to ensure information hygienic practices in information management. In order to fight COVID-19, librarians and related information professionals with relevant tools should aim at helping prevent COVID-19 pandemic infodemic (coroinfodeluge). This article explores how libraries and librarians can contribute to the fight against COVID-19 through waging wars in the realm of access to information amidst an avalanche of disinformation. This article analysed how librarians can be proactive in contributing to the fight against the COVID-19 pandemic through innovative strategies that ensure an informed citizenry. The study used qualitative content analysis as the study design. Documents were retrieved from trusted websites and they were coded before analysis. These documents included legal instruments, scholarly publications from accredited databases including Elsevier and Emerald. The study found out that librarians were not included in the national programmes to manage the COVID-19 pandemic, yet they possess potential to contribute to the fight against misinformation by educating citizens on information hygienic practices, for example, by directing users to credible or trustworthy sources on the pandemic. The study concluded that librarians can be useful stakeholders to the management of the COVID-19 pandemic and infodemic because they possess knowledge and skills relating to critical literacies that are needed in the 21st century. It recommends a collaborative framework that includes community leaders and strategic partners – to help librarians ensure that the citizenry is not misinformed during emergencies

A Preliminary Study on Accident Analysis of Portable Timber Sawmills Used in Mazamba Forest Plantation in Northern Malawi

This study investigated the main causes of accidents, levels of injuries, and mitigation measures to wood processing accidents. Structured interviews were conducted on 45 respondents drawn from various portable sawmills. The Chi square test showed that there were highly significant differences on frequency distribution of causes of sawmill accidents. However, a principal component analysis revealed that accidents were mainly caused by inappropriate equipment setup or operation and harsh weather conditions. Secondly, results showed that the frequency distribution of responses on levels of accidents was highly significantly different among the respondents. Near-misses accounted for most of responses (55.6%). This is because near-misses are precursors to secondary accidents. Furthermore, the results showed highly significant differences on the frequency distribution of various mitigation measures available. Use of personal protective equipment and provision of special training were highly appraised. Forest workers need occupation safety and health and ergonomic knowledge before engaging in wood processing

Understanding indigenous knowledge: Bridging the knowledge gap through a knowledge creation model for agricultural development

This article addresses the management of agricultural indigenous knowledge (IK) in developing countries, with a specific focus on Tanzania. It provides background details on IK and its importance for agricultural development. It introduces various knowledge management (KM) concepts and discusses their application in managing IK in the developing world by placing Nonaka’s knowledge creation theory (Nonaka 1991; Nonaka & Takeuchi 1995; Nonaka, Toyama & Konno 2000) in the context of the local communities. Data from focus groups were used to triangulate with data from interviews in order to validate, confirm and corroborate quantitative results with qualitative findings. The study findings showed that knowledge creation theory can be used to manage IK in the local communities, however, adequate and appropriate resources need to be allocated for capturing and preserving IK before it disappears altogether. For sustainable agricultural development, the communities have to be placed within a knowledge-creating setting that continuously creates, distributes and shares knowledge within and beyond the communities’ boundaries and integrates it with new agricultural technologies, innovations and knowledge

The Relevance of Indigenous Knowledge for Small-Scale Farming in Tanzania

This article is based on a study that sought to explore small-scale farmers’ perceptions and understanding of indigenous farming with an ultimate goal of promoting the use of IK for agricultural development in Tanzania. This study was mainly qualitative, where semistructured interviews were used to collect data from 181 small-scale farmers in six rural districts of Tanzania. Based on the study findings, it was evident that the local communities had an extensive base of IK and understanding of their environment, and they were able to put appropriate managerial skills and adaptive strategies to crop and animal farming. The findings also showed that IK was location specific, and farmers possessed IK on various farm tasks such as evaluation of soil quality, preservation of planting materials and crops, plant diseases and pest control and animal disease control. It is thus important to understand and facilitate the identification, documentation and use of this knowledge as well as integrating it with conventional knowledge for improved agricultural activities. The knowledge intermediaries (research, education, information and knowledge services, and agricultural support services) should thus conduct regular user studies to identify, validate and document IK in order to determine areas that need intervention, and to enable the incorporation of IK into research to enrich the agricultural technology development process and make it relevant for farmers.Keywords: Indigenous knowledge, local knowledge, agricultural indigenous knowledg

Calcined magnesite as an adsorbent for cationic and anionic dyes: characterization, adsorption parameters, isotherms and kinetics study

The ability of calcined magnesite for Methylene Blue (MB), Direct Red 81 (DR81), Methyl Orange (MO) and Crystal Violet (CV) dye removal was evaluated in this study. The experiments were designed to test the hypothesis that alkaline earth carbonates can remove dyes from water through a combination of sorption and coagulative reactions involving Mg2+. To achieve that, several operational factors like residence time, dosage, adsorbent concentration and temperature were appraised. The batch study proved that calcined magnesite is effective in the treatment of MB, DR81, CV and MO contaminated water and moreover it performed well in terms of color removal. The adsorption equilibrium data were analysed by the Langmuir, Freundlich, Dubinin–Radushkevich and Temkin isotherm models, and the Dubinin–Radushkevich and Temkin models were found to be the most appropriate fit to MB and MO dyes respectively. The adsorption kinetics process primarily followed the Elovich and Pseudo-second order model, a possible indication that chemisorption was the rate limiting step during the dye uptake process. With the adsorption–desorption cycle repeated four times, the calcined magnesite regeneration efficiency for DR81 and MO loaded dyes remained very high. According to the results of this study, it can be concluded that calcined magnesite can be used effectively for the adsorption of MB, DR81, CV and MO from wastewater