Electrochemical oxidation of niclosamide at a glassy carbon electrode and its determination by voltammetry

Cyclic voltammetry, square-wave voltammetry and controlled potential electrolysis have been used to study the electrochemical oxidation behaviour of niclosamide at a glassy carbon electrode. The number of electrons transferred, the wave characteristics, the diffusion coefficient and reversibility of the reactions have been investigated. Following optimisation of voltammetric parameters, pH, and reproducibility, a linear calibration curve over the range 1 x 10-6 – 1 x 10-4 mol dm-3 niclosamide was achieved. The detection limit was found to be 8 x 10-7 mol dm-3. For eight successive determinations of 1 x 10-5 mol dm-3 niclosamide, a relative standard deviation of 3.6% was obtained. This voltammetric method was applied for the determination of niclosamide in tablets. KEY WORDS: Niclosamide, Electrochemical oxidation, Cyclic voltammetry, Square wave voltammetry, Glassy carbon electrode, Determination of niclosamide  Bull. Chem. Soc. Ethiop. 2003, 17(1), 95-106

Strategies of tailored nanomaterials for electrochemiluminescence signal enhancements

Nanomaterials and their applications were studied extensively over the past few decades due to their properties which are associated mainly with the nanoscale sizes and unique characteristics that they have. Among many applications, these nanomaterials have been playing great, multifaceted roles in increasing the analytical performances of electrochemiluminescence (ECL). In this article, we review the main possible approaches – based on nanoparticles – to modify the photophysical properties of the excited state generated as a consequence of the electrochemical stimulus and in particular taking profit of the so-called metal-enhanced fluorescence (MEF) and resonance energy transfer (RET) processes. We believe that these strategies will lead to the design of very efficient systems that can substantially increase the possible successful applications of ECL

Assessment of the Quality of Drinking Water Supply, and the Status of Sanitation and Hygiene in Mudulla Town, Tembaro Woreda, Southern Ethiopia

Limited access associated with poor water supply, hygiene and sanitation is widening the poverty gap, gender inequality and prevalence of water born diseases. This research work is aimed to examine the quality of existing water supply, sanitation and hygiene status of Mudula Town. To achieve this objective, the household survey and Water samples were collected from three water sources (spring), storage and taps. With the exception of Kalahiwot spring for Turbidity (7.75NTU), all others were within the standards. For bacteriological analysis, Gofore spring is within the standard. But samples tested from Bada and Kalahiwot did not meet the WHO and EPA bacteriological standards for drinking water. The correlation result of physical parameters shows that for all sources turbidity, TDS and EC has strong positive correlation with each other. With the exception of Gofere spring source, fecal coliform (E.coli) is negatively correlated with Temperature and positivity correlated with Total coliform for both spring water sources. The current average per capital water converge in the area is 68% and its consumption is strongly correlated with house hold income amount. Similarly for sanitation, from total respondents 5% use pit latrine without house, 10% pit latrine with house and remain 85% use pit latrine with wall and roof. Regarding to solid waste, 55% dispose solid waste on garden and 45% have sanitary pit. From total respondents, up to 55% do not use water after defecating. The rest also have a gap on using soap continuously. Therefore, to overcome the problems regular chlorination of water, sanitation and hygiene practicing awareness may be required. Keywords: Water Supply, Coverage, Water Quality, Sanitation and Hygiene practice

Determinants of mortality among under-five children admitted with severe acute malnutrition in Addis Ababa, Ethiopia.

BACKGROUND: Management of severe acute malnutrition (SAM) has been a program priority in Ethiopia, but it remains the leading cause of mortality in under-five children. Hence, this study aimed to identify the incidence density rate of mortality and determinants among under-five children with severe acute malnutrition in St. Paul's Hospital Millennium Medical College, 2012 to 2019. METHODS: A retrospective cohort study was conducted and data were collected using a structured checklist from 673 charts, of which 610 charts were included in the final analysis. The Kaplan-Meier survival curve with Log-rank test was used to estimate the survival time. Bi-variable and multi-variable Cox proportional hazard regression models were fitted to identify determinants of death. Schoenfeld residuals test was used to check a proportional hazard assumption. Goodness of fit of the final model was checked using Nelson Aalen cumulative hazard function against Cox-Snell residual. RESULTS: In this study, 61 (10%) children died making the incidence density rate of death 5.6 (95% CI: 4.4, 7.2) per 1000 child-days. Shock (Adjusted Hazard Ratio) [AHR] =3.2; 95% CI: 1.6, 6.3)), IV fluid infusion (AHR = 5.2; 95% CI: 2.4, 10.4), supplementing F100 (AHR = 0.12; 95%CI: 0.06, 0.23) and zinc (AHR = 0.45; 95% CI: 0.22, 0.93) were determinants of death. CONCLUSION: The overall proportion of deaths was within the range put forth by the Sphere standard and the national SAM management protocol. Shock and IV fluid infusion increased the hazard of death, whereas F100 & zinc were found to decrease the likelihood death. Children with SAM presented with shock should be handled carefully and IV fluids should be given with precautions

Linking Social Protection Schemes: The Joint Effects of a Public Works and a Health Insurance Programme in Ethiopia

In developing countries and in particular in sub-Saharan Africa, social protection schemes tend to operate in silos. However, schemes targeting the same geographical areas may have synergies that have not yet been examined, and which are worth scrutinising. This paper contributes to this knowledge gap by examining the joint impacts of two social protection programmes in Ethiopia, that is, the Productive Safety Net Programme and a Community Based Health Insurance Scheme. Based on three rounds of individual level panel data and several rounds of qualitative interviews, we find that individuals covered by both programmes, as opposed to neither or only one of the two programmes, provide greater labour supply, have larger livestock holdings, and have a lower amount of outstanding loans. Furthermore, joint participation is associated with greater use of modern health care facilities as compared to participating only in the safety net programme. These results show that bundling of interventions enhances protection against multiple risks and that linking social protection schemes yields more than the sum of their individual effects

Podoconiosis in East and West Gojam Zones, Northern Ethiopia

Background: Podoconiosis is a neglected tropical disease (NTD) that is prevalent in red clay soil-covered highlands of tropical Africa, Central and South America, and northern India. It is estimated that up to one million cases exist in Ethiopia. This study aimed to estimate the prevalence of podoconiosis in East and West Gojam Zones of Amhara Region in northern Ethiopia. Methodology/Principal Findings: A cross-sectional household survey was conducted in Debre Eliyas and Dembecha woredas (districts) in East and West Gojam Zones, respectively. The survey covered all 17,553 households in 20 kebeles (administrative subunits) randomly selected from the two woredas. A detailed structured interview was conducted on 1,704 cases of podoconiosis identified in the survey. Results: The prevalence of podoconiosis in the population aged 15 years and above was found to be 3.3% (95% CI, 3.2% to 3.6%). 87% of cases were in the economically active age group (15–64 years). On average, patients sought treatment five years after the start of the leg swelling. Most subjects had second (42.7%) or third (36.1%) clinical stage disease, 97.9% had mossy lesions, and 53% had open wounds. On average, patients had five episodes of acute adenolymphangitis (ALA) per year and spent a total of 90 days per year with ALA. The median age of first use of shoes and socks were 22 and 23 years, respectively. More men than women owned more than one pair of shoes (61.1% vs. 50.5%; x2 = 11.6 p = 0.001). At the time of interview, 23.6% of the respondents were barefoot, of whom about two-thirds were women. Conclusions: This study showed high prevalence of podoconiosis and associated morbidities such as ALA, mossy lesions and open wounds in northern Ethiopia. Predominance of cases at early clinical stage of podoconiosis indicates the potential for reversing the swelling and calls for disease prevention interventions

Estimating morbidity due to stroke in Nigeria: a systematic review and meta-analysis

The response to stroke in Nigeria is impaired by inadequate epidemiologic information. We sought to collate available evidence and estimate the incidence of stroke and prevalence of stroke survivors in Nigeria. Using random effects meta-analysis, we pooled nationwide and regional incidence and prevalence of stroke from the estimates reported in each study. Eleven studies met our selection criteria. The pooled crude incidence of stroke in Nigeria was 26.0 (12.8-39.0) /100,000 person-years, with this higher among men at 34.1 (9.7-58.4) /100,000, compared to women at 21.2 (7.4-35.0) /100,000. The pooled crude prevalence of stroke survivors in Nigeria was 6.7 (5.8-7.7) /1000 population, with this also higher among men at 6.4 (5.1-7.6) /1000, compared to women at 4.4 (3.4-5.5) /1000. In the period 2000-2009, the incidence of stroke in Nigeria was 24.3 (95% CI: 11.9-36.8) per 100,000, with this increasing to 27.4 (95% CI: 2.2-52.7) per 100,000 from 2010 upwards. The prevalence of stroke survivors increased minimally from 6.0 (95% CI: 4.6-7.5) per 1000 to 7.5 (95% CI: 5.8-9.1) per 1000 over the same period. The prevalence of stroke survivors was highest in the South-south region at 13.4 (9.1-17.8) /100,000 and among rural dwellers at 10.8 (7.5-14.1) /100,000. Although study period does not appear to contribute substantially to variations in stroke morbidity in Nigeria, an increasing number of new cases compared to survivors may be due in part to limited door-door surveys, or possibly reflects an increasing mortality from stroke in the country. [Abstract copyright: Copyright © 2019 Elsevier B.V. All rights reserved.