Environmental and Societal Impact of Nanotechnology

The ability to measure, understand, manipulate, organize, engineer and control matter on the nanoscale has been opening up the wealth of possibilities that were otherwise non - existent at higher scales. At this scale, basic research principles and tools in biology, physics, chemistry, and engineering converge and have led to all-inclusive applications of nanotechnology. Despite the innovative applications and promising potentials of nanotechnology, there are concerns about its short and long-lasting impacts on humans, nature and the environment. In an attempt to address these concerns, a number of researches have been conducted. Evaluations of studies addressing the issues of nanotechnologies and their impacts are necessary to give insights for further studies that will advance the technology for the true benefit of mankind and nature. This study, thus, provides a detailed review of studies on nanotechnology applications and the positions of stakeholders on the impact of nanotechnology. Among other things, the outcome of this survey shows that there are numerous successful applications of nanotechnology. Public perceptions are pivotal in determining the extent of revolution and transformation that nanotechnology will have on the environment. Religious beliefs and moral concerns; trust in governmental regulatory agencies and the industry; the level of inclusion of the society in the product design, development, and commercialization process is critical to the extent of acceptance of nanotechnology inventions. Expression of objective views concerning the benefits, limitations & risks, and adequate education of the public, risk regulators & all stakeholders are crucial in determining the fate of nanotechnolog

Design and Preliminary Evaluation of a Dry Cowpea Dehuller

Cowpea dehulling is an important operation in the processing of cowpea. Traditional cowpea dehulling methods recognize the soaking of cowpea in water for a significant amount of time before manual abrasion is carried out either through the use of mortar and pestle, hands, or legs. Existing mechanical alternatives also require prolonged soaking of cowpea before dehulling occurs in addition to being expensive and beyond the reach of many rural populations. This study designed and fabricated a dry cowpea dehulling machine using engineering principles and with locally available materials. Components of the machine include the hopper, power transmission drive, dehulling chamber, polishing chamber, sieves, discharge chute, and agitator. Dry cowpea varieties of Brown Drum (15%Mc dB) and Oloyin (17.5%Mc dB) cowpea weighing 500 g each were fed into the machine at a constant speed of 358 rpm. Preliminary tests showed the “Brown Drum” cowpea variety recorded a maximum dehulling efficiency of 97.44% in 7 minutes while the Oloyin variety was completely dehulled in 7 minutes at 98.75% efficiency. The throughput capacity recorded was 450kg/hr and this machine raises the possibility of producing dry dehulled cowpea for domestic and industrial end-users

A two-stage coupling process for the recovery of base oils from used lubricating oils

This study aims to apply a two-stage solvent extraction and adsorption principles for base oil recovery from used lubricating oils (UBO). Methyl-ethyl ketone was utilized as the solvent for extraction and activated carbon (AC) from unripe plantain peels as the adsorbent. The activities of the solvent to oil proportions from 1:1 to 5:1 on lube oil recovery were analyzed in terms viscosity of the oil, total base number (TBN) of lubricating oil, and percent weight of metallic contents removal from used oil. The results confirm that solvent to oil ratio of 3:1 gave excellent efficiencies relating the UBO to a treated base oil (TBO) with the highest removal of contaminants, increased viscosity, high TBN after the two-stage treatments. The results after solvent extraction at varying temperatures of 30, 45, 60 oC showed the TBN increased to 32% (10.21 mgKOH/g from an initial UBO value of 6.90 mgKOH/g) at 60 oC extraction temperature. After the adsorption stage, the removal of metallic contaminants at the 60 oC extractive temperature and AC 15 wt% loading was 91% for calcium and over 91% for zinc. The optimum solvent to oil ratio of 3:1 at 60 °C yielded a base oil with a kinematic viscosity of 90.23 centiStokes, a flashpoint of 203 °C, the density of 0.909 g/ml and sulphur content of 0.64 wt%. This refined base oil obtained had close similarities with fresh Ram SN500 base oil

Assessment of Economic and Environmental Impacts of Energy Conservation Strategies in a University Campus

Large institutions, such as universities, consume large amounts of energy daily.The quantity of energy consumed is continually rising due to an increase in student enrolment and expansion of energy facilities. Energy conservation practices are essential at the university campus as they decrease environmental impact and also reduce energy cost burdens on university management. Hence, it is essential to understand the pattern of energy consumption in the university campus to ensure the sustainability of energy usage, reduction in its costs and environmental impacts. This study takes a look at the energy consumption in Covenant University to provide recommendations that would help to decrease the energy consumption in the university. An energy audit was conducted on 18 selected buildings to determine the electrical appliances responsible for energy consumption in the selected buildings. Building energy models were constructed for each of the buildings using Quick Energy Simulation Tool (eQUEST Software) to run parametric simulations on the generated models. The utility bills of the university for the past five years (2014 – 2018) were examined for seasonal variation of energy consumption. The study revealed that there are several ways of energy wastage in the university.Additionally, suggestions on possible solutions to energy conservation strategies to reduce energy consumption in the facilities are presented. A qualitative analysis of two recommendations showed that over N30 million ($81,000) could be saved annually with a payback time of fewer than six years. Also, the implementation of these suggested recommendations could eliminate about 500 tons of CO2 emissions annually

Characterization of oils from Duranta repens

The knowledge of the chemical composition of unpopular sources of edible oils has become paramount to supplement the usage of widely known vegetable oils. In this study, the gas chromatographic quantification of fatty acids and phytochemicals was carried out, and the physicochemical and micronutrient composition of Duranta repens leaf and seed oil were evaluated using standard methods. The leaf oils contained significantly higher (p  oleic > myristic > stearic > capric > linoleic > lauric > palmitoleic for the seed oil, while for the leaf oil linoleic > palmitoleic > oleic > stearic > palmitic > myristic > capric > lauric > myristoleic. The major phytochemical constituents of the seed oils were catechin (68.12 ug/ml), saponin (44.03 ug/ml), rutin (32.89 ug/ml), linamarin (22.66 ug/ml) and tannins (19.62 ug/ml), while kaempherol (84.05 ug/ml), rutin (62.26 ug/ml) and saponins (45.63 ug/ml) were mostly predominant in the leaf oil. Spartein, anthocyanins and phytates were among the least phytochemicals in composition, for both samples. These chemical properties evaluated, suggest that Duranta repens seed oil is more suitable for industrial and therapeutic purposes

Challenges of residency training and early career doctors in Nigeria study (charting study): a protocol paper

Introduction: Early career doctors (ECDs) make up a significant proportion of the workforce of medical/dental practitioners in Nigeria. ECDs play pivotal roles in the Nigerian healthcare system. However, several factors affect ECDs in their career endeavours, ranging from poor remuneration to psychosocial problems (such as burn out, job dissatisfaction, etc.). While other countries have tried to investigate these factors and their impact, no national inquiry has been done yet in Nigeria. This demonstrates the critical need to conduct a nationally representativestudy exploring these factors, such as demographic, workplace and psychosocial factors, among ECDs in Nigeria. This article is a protocol paper for the challenges of residency training and early career doctors in Nigeria study; charting study to be conducted under the auspices of the Nigerian Association of Resident Doctors of Nigeria(NARD).Methods: The Charting Study would be a mixed study design, utilizing both qualitative and quantitative study designs and access data from structured questionnaire, focus group interview and secondary data available to the association.Conclusion: The outcome of this study will provide great insight into various issues affecting ECDs in Nigeria and make necessary recommendations.Keywords: Nigeria, early career doctors, junior doctors, physicians, dentists, workplace, psychosocial issue

Author Correction: Discovery of 42 genome-wide significant loci associated with dyslexia

Correction to: Nature Genetics https://doi.org/10.1038/s41588-022-01192-y. Published online 20 October 2022. In the version of this article originally published, a paragraph was omitted in the Methods section, reading “Genomic control. Top SNPs are reported from the more conservative GWAS results adjusted for genomic control (Fig. 1, Extended Data Figs. 1–4, and Supplementary Tables 1, 2, 9 and 10), whereas downstream analyses (including gene-set analysis, enrichment and heritability partitioning, genetic correlations, polygenic prediction, candidate gene replication) are based on GWAS results without genomic control.” The paragraph has now been included in the HTML and PDF versions of the article

Challenges of Residency Training and Early Career Doctors in Nigeria Phase II: Update on Objectives, Design, and Rationale of Study

Background: Early career doctors (ECDs) are a dynamic and highly mobile group of medical and dental practitioners who form a significant proportion of the health workforce in Nigeria. The challenges of residency training and ECDs in Nigeria CHARTING Phase I study explored limited challenges affecting ECDs under the broad themes of demography, workplace issues, and psychosocial issues. The CHARTING II was expanded to provide wider insight into the challenges of ECDs in Nigeria. Objective: This protocol aims to provide clear objectives including description of objectives, design, and rationale for the conduct of the proposed CHARTING II study which seeks to explore other components under the various themes of demographic, workplace, psychosocial issues affecting the ECDs in Nigeria, and which were not explored under CHARTING I.   Methodology: This shall be a mixed study design that will combine qualitative and quantitative methods, to investigate 27 subthemes among 2000 ECDs spread across 31 centers, accredited by the Nigerian Association of Resident Doctors. Participants shall be selected using the multistage sampling method. The primary data will be generated using structured proforma and validated questionnaires,while administrative sources would serve as a source of secondary data. Data will be entered and analyzed using appropriate statisticalsoftware. Conclusion: CHARTING II study would provide more robust data and insight into the problems encountered by ECDs in Nigeria. This would in turn build a platform for institutional engagement and advocacy in order to drive relevant policies to mitigate these challenges. Keywords: Early career doctors, Nigeria, residency, resident doctors, trainin

Influence of parental education levels on eating habits of pupils in Nigerian primary schools

Abstract: This study investigated the eating habits of pupils in Nigerian primary schools based on the respective education levels of their parents. Data were obtained using the Child Eating Behavior Questionnaire (CEBQ). Participants included a total of 144 pupils who were purposively selected from 6 primary schools. Based on responses, a cross-sectional analytic study design was implemented to investigate how parental education levels (PELs) influenced the eating habits of their children. Data assessment was performed using a one-way between-group analysis of variance at the .05 probability level. PELs significantly affected the eating habits of participants, respectively. Specifically, low PEL was associated with more satiety responsiveness to food (F [2, 141]=14.251, P<.001), higher responsiveness to food (F [2, 141]=36.943, P=<.001) greater food enjoyment (F [2, 141]=93.322, P<.001), greater drinking desires (F [2, 141]=23.677, P<.001), and the tendency for emotional over-eating (F [2, 141]=13.428, P<.001), while high PEL was associated with slower eating (F [2, 141]=11.665, P<.001), fussier responses to food (F [2, 141]=14.865, P<.001), and a higher tendency for emotional under-eating (F [2, 141]=5.137, P<.01). This study examined PELs in relation to the respective eating habits of their children, who were attending Nigerian primary schools. Data showed that children with parents who had high, middle, and low education levels tended to exhibit progressively worse eating habits, in descending order