Ectoparasites of goats in three agroecologies in central Oromia, Ethiopia

A cross-sectional study was conducted to determine the prevalence and risk factors for ectoparasites infestation in 979 goats in three agroecologies in central Oromia, Ethiopia from October 2009 through April 2010. The results of the study showed that of the total goats examined 487 (49.7 %) of them were infested with one or more ectoparasites. The ectoparasites identified were (16.5 %) Linognathus spp., 8.8 % Sarcoptes, 5 % Ctenocephalides spp. 11.8 % Amblyomma variegatum, 5.9 % Rhipicephalus evertsi evertsi, 4.3 % Rhipicephalus pravus, 1.6 % Boophilus decoloratus, 1.8 % Rhipicephalus sanguineus, 1.3 % Rhipicephalus praetextatus, and 0.4 % Hyalomma truncatum. Statistically significant (OR?=?0.477, p?=?0.000) difference was observed in prevalence of Linognathus stenopsis among highland, lowland and midland. Significantly higher prevalence of tick infestation in the lowland than both the midland and highland agroecology was recorded. The risk of tick infestations in lowland and midland was 2.841 and 5.635 times, respectively, higher than in highlands. Age-related variation was not observed in the prevalence of both Linognathus and tick infestations in examined goats. Significantly (OR?=?7.864, p?=?0.000) higher prevalence of sarcoptic mange in the lowland than the midland was observed. Goats in lowland were 7.864 times at higher risk for sarcoptic mange than those in the midlands. Sex-related variation in the prevalence of ectoparasites was never recorded in goats. Significantly higher prevalence of sarcoptic mange (OR?=?0.266, p?=?0.000) and Ctenocephalides spp. (OR?=?2.430, p?=?0.005) on young than adult goats was recorded. The logistic regression results showed statistically significant difference in prevalence of tick infestations (OR?=?0.565, p?=?0.000) and sarcoptic mange (OR?=?0.582, p?=?0.003) between goats with poor and good body condition. Further studies on role of ectoparasites in transmission of diseases to goats, comparative prevalence and load, and the importance of goats as alternative hosts in different agroecology and management systems in Ethiopia are recommended so as to design applicable control program in the country. Furthermore, the threat of ectoparasites on overall productivity of goats and the tanning industry warrants detail studies and urgent control intervention.     

The relationship between body mass index and socioeconomic and demographic indicators: evidence from Australia

Objectives  

This paper explores the association of body mass index (BMI) with socioeconomic and demographic factors using data from the 6th wave of the Household, Income and Labour Dynamics in Australia (HILDA) Survey.     

Green syntheses of silver nanoparticle decorated reduced graphene oxide using l-methionine as a reducing and stabilizing agent for enhanced catalytic hydrogenation of 4-nitrophenol and antibacterial activity

Herein, we have reported a facile and green synthesis approach of Ag NP decorated reduced graphene oxide (RGO) through an in situ self-assembly method in the presence of l-methionine (l-Met) as reducing and stabilizing agent. The electronic properties, crystal structure, and morphology of the as-synthesized RGO–Ag nanocomposite were investigated by UV-Visible (UV-Vis) spectroscopy, Fourier transform-infrared (FTIR), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) techniques. UV-Vis and FTIR show the effective reduction of GO and the formation of Ag NPs using l-Met. FESEM, TEM, and XRD analysis show the successful impregnation of Ag NPs into RGO with a 23 nm average crystallite size. The RGO–Ag nanocomposite with NaBH₄ shows a fast-catalytic reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AMP). The enhanced catalytic activity of RGO–Ag nanocomposites can be attributed to the synergistic effect of improved adsorption capacity and the absence of agglomeration of Ag nanoparticles. Moreover, RGO–Ag showed strong antibacterial activity against B. subtilis and E. coli.

Herein, we have reported a facile and green synthesis approach of Ag NP decorated reduced graphene oxide (RGO) through an in situ self-assembly method in the presence of l-methionine (l-Met) as reducing and stabilizing agent.     

Diabetes alters the response to bacteria by enhancing fibroblast apoptosis

Diabetics suffer from both more frequent bacterial infections and greater consequences of infection. However, bacteria-induced tissue destruction and the subsequent response in diabetics have received relatively little attention. To investigate this issue, we inoculated the scalp of control or db/db diabetic mice, with the pathogen Porphyromonas gingivalis, which causes connective tissue destruction in humans. Both bacteria-induced cytokine expression and tissue loss were similar in diabetic and control mice. However, there was a significantly higher rate of fibroblast-specific apoptosis in the diabetic group, which was measured as cells that were double positive for the terminal deoxynucleotidyltransferase-mediated deoxy-UTP nick end labeling assay and expression of vimentin. The higher rate of fibroblast apoptosis could be explained in the diabetic group by enhanced levels of activated caspase-3. Apoptosis was evident during the peak healing period and coincided with reduced numbers of fibroblasts, diminished collagen I and III expression, and significantly reduced formation of new connective tissue matrix in diabetic mice. Thus, diabetes may impair the healing response to bacteria-induced connective tissue loss by increasing the number of caspase-3-activated fibroblasts, leading to greater apoptosis and reduced numbers of fibroblastic cells.     

Experimental Study on Bond Performance of Carbon- and Glass-Fiber Reinforced Polymer (CFRP/GFRP) Bars and Steel Strands to Concrete

FRP bars and steel strands are widely used in civil engineering. In this study, three different types of high-strength reinforcement materials, carbon fiber reinforced polymer (CFRP) bar, glass fiber reinforced polymer (GFRP) bar, and steel strand, were investigated for their interfacial bond performance with concrete. A total of 90 sets of specimens were conducted to analyze the effects of various parameters such as the diameter of reinforcement, bond length, the grade of concrete and stirrup on the bond strength and residual bond strength. The results show that CFRP bars possess a higher bond strength retention rate than steel bars in the residual section. In addition, with the increase in bond length and diameter of the CFRP bar, the residual bond strength decreases, and the bond strength retention rate decreases. Furthermore, the bond strength retention rate of GFRP bars was found to be higher than that of CFRP bars. With the increase in grade of concrete, the bond strength and residual bond strength between GFRP bars and concrete increases, but the bond strength retention rate decreases. With an increase in bond length and diameter of the GFRP bar, the bond strength starts to decrease. Further, stirrup can also increase the bond strength and reduce the slip at the free end of GFRP bars. Moreover, the bond strength retention rate of the steel strand was found to be lower than CFRP and GFRP bar.     

Factors contributing to motivation of volunteer community health workers in Ethiopia: the case of four woredas (districts) in Oromia and Tigray regions

Background

The use of community health workers (CHWs) has been considered as one of the strategies to address the growing shortage of health workers, predominantly in low-income countries. They are playing a pivotal role in lessening health disparities through improving health outcomes for underserved populations. Yet, little is known about what factors motivate and drive them to continue working as CHWs. In this study, we aimed to examine factors contributing to the motivation of volunteer CHWs (vCHWs) in Ethiopia currently known as one-to-five network leaders (1to5NLs) and explore variations between attributes of social and work-related determinants.

Method

We conducted a cross-sectional study in four selected woredas (the second lowest administrative structure in Ethiopia, and similar to a district) of Oromia and Tigray regions and interviewed 786 1to5NLs. The effects of each motivational factor were explored using percentage of respondents who agreed and strongly agreed to each of them and Mann-Whitney U test.

Results

Individual, community, and health system factors contributed to the motivation of 1to5NLs in this study. Intrinsic desire to have a good status in the community as a result of their volunteer service (81.86%) followed by a commitment to serve the community (81.61%) and to gain satisfaction by accomplishing something worthwhile to the community (81.61%) were some of the factors motivating 1to5NLs in our study. Despite these motivational items, factors such as lack of career development (51.47%), unclear health development army guideline (59.26%), limited supervision and support (62.32%), and lack of recognition and appreciation of accomplishments (63.22%) were the factors negatively affecting motivation of 1to5NLs. Lack of career development, limited supervision and support, and lack of recognition and appreciation of accomplishments were significantly varied between attributes of educational level, marital status, service year as 1to5NLs, and previous volunteer engagement (at P?< 0.05).

Conclusion

Findings of our study indicated that non-financial incentives such as the creation of career development models is the key to motivating and retaining CHWs where they are not receiving stipends. Sustainability of CHW program should consider exploring enhanced innovations to strengthen supportive supervision, development of better mechanisms to publicize the role of CHWs, and improvement of recognition and appreciation schemes for CHWs’ efforts and accomplishments.