Thiocarbonate collectors in pyrite flotation ? fundamentals and applications

Journal ArticleRecent results from electrochemical measurements demonstrate that trithiocarbonate (TTC) collectors are more readily oxidized to their corresponding dithiolates than the dithiocarbonate/xanthate (DTC) collectors. Based on the traditional analysis of collector adsorption, trithiocarbonates might then be expected to be effective for bulk sulfide mineral flotation. Previous bench-scale flotation research had shown that TTC collectors are very effective for the flotation of copper sulfide minerals and PGM (platinum group metal) sulfide minerals

The psychosocial effect of the COVID-19 national lockdown on Dentistry and Oral Hygiene students

The COVID-19 lockdown has had a psychological and social impact on dental students globally. To determine the psychosocial effect on students enrolled in dentistry and oral hygiene courses at UWC. To determine the psychosocial effects (living conditions, levels of anxiety, fear of COVID-19, and food security levels) experienced by students during the lockdown. A descriptive, cross-sectional study using a quantitative approach was used. Methods: A randomised sample (n=250), stratified by sex and academic year group, comprising undergraduate oral hygiene BOH total students = 90 and dentistry BDS total students = 450 (UWC, 2020) was used. Data was gathered via an online survey, (Google Forms). Survey questions included the GAD-7, FCV-19S questionnaire, and Food Security scales. The data were analysed using Epi Info 7. The response rate was 36% (n=90); 69.67% were female; the mean age was 22.34 (SD = 2.66); 91% lived with their parents during lockdown. Students’ main sources of funding were parents (47%), NSFAS or bursary (42%) and self-funded (11%). Substantial psychosocial effects with high anxiety (33%), fear of COVID-19 (47.3 %), and a lesser effect for food insecurity (FI) (5.49%) was reported. The study showed that the COVID-19 pandemic has contributed to psychosocial effects in a discipline that under ‘normal” conditions is experienced as stressful. This requires educational institutions to develop a targeted approach through relevant support systems that would identify vulnerable students at critical times

Dental educators’ views and knowledge of competencies required within a competency framework

The aim of the study was twofold; first was to explore and describe dental educators’ views of the competencies required within the AfriMEDS core competency framework. The second was to highlight the views of the dental educators, regarding the alignment of the AfriMEDS core competencies, with the dental curriculum. A case study approach to qualitative inquiry was used. The participants were purposefully selected, and two focus group discussions were conducted. An interview protocol was used to guide the discussions. The gathered data from the discussions were transcribed verbatim, and uploaded to the Atlas ti program for data analysis. Themes were identified from the findings of the thematic analysis. Results Dental educators required some guidance and clarity on the AfriMEDS core competency framework. However, they were able to recognize the competencies related to the AfriMEDS core competency framework. Two of these competencies, evidence-based dentistry, and private practice, were highlighted as core competencies in this current study; however, in AfriMEDS, only certain aspects of this was described. The results of this current study revealed that dental educators were able to make valuable recommendations about the additional competencies requirements for dental graduates

Functional Relaxation and Guided Imagery as Complementary Therapy in Asthma: A Randomized Controlled Clinical Trial

Background: Asthma is a frequently disabling and almost invariably distressing disease that has a high overall prevalence. Although relaxation techniques and hypnotherapeutic interventions have proven their effectiveness in numerous trials, relaxation therapies are still not recommended in treatment guidelines due to a lack of methodological quality in many of the trials. Therefore, this study aims to investigate the efficacy of the brief relaxation technique of functional relaxation (FR) and guided imagery (GI) in adult asthmatics in a randomized controlled trial. Methods: 64 patients with extrinsic bronchial asthma were treated over a 4-week period and assessed at baseline, after treatment and after 4 months, for follow-up. 16 patients completed FR, 14 GI, 15 both FR and GI (FR/GI) and 13 received a placebo relaxation technique as the control intervention (CI). The forced expiratory volume in the first second (FEV 1) as well as the specific airway resistance (sR(aw)) were employed as primary outcome measures. Results: Participation in FR, GI and FR/GI led to increases in FEV 1 (% predicted) of 7.6 +/- 13.2, 3.3 +/- 9.8, and 8.3 +/- 21.0, respectively, as compared to -1.8 +/- 11.1 in the CI group at the end of the therapy. After follow-up, the increases in FEV 1 were 6.9 +/- 10.3 in the FR group, 4.4 +/- 7.3 in the GI and 4.5 +/- 8.1 in the FR/GI, compared to -2.8 +/- 9.2 in the CI. Improvements in sR(aw) (% predicted) were in keeping with the changes in FEV 1 in all groups. Conclusions: Our study confirms a positive effect of FR on respiratory parameters and suggests a clinically relevant long-term benefit from FR as a nonpharmacological and complementary therapy treatment option. Copyright (C) 2009 S. Karger AG, Base

Comparison of the ability of anthropometric indices to predict the risk of diabetes mellitus in South African males: Sanhanes-1

This study aimed to assess the sensitivity of body mass index (BMI) to predict the risk of diabetes mellitus (DM) and whether waist circumference (WC), waist-to-hip (WHR) and waist-toheight (WHtR) ratios are better predictors of the risk of DM than BMI in South African men aged 20 years and older. Data from the first South African National Health and Nutrition Examination Survey (SANHANES-1) were used. Overall, 1405 men who had valid HbA1c outcomes were included. The sensitivity, specificity, and optimal cut-off points for predicting DM were determined using the receiver operating characteristic (ROC) curve analysis. A total of 34.6% percent of the study participants were overweight/obese, while 10.5%, 10.4%, 36.6% and 61.0% had HbA1c, WC, WHR and WHtR above the normal reference ranges, respectively

Dental educators’ views and knowledge of competencies required within a competency framework

The aim of the study was twofold; first was to explore and describe dental educators’ views of the competencies required within the AfriMEDS core competency framework. The second was to highlight the views of the dental educators, regarding the alignment of the AfriMEDS core competencies, with the dental curriculum.A case study approach to qualitative inquiry was used. The participants were purposefully selected, and two focus group discussions were conducted. An interview protocol was used to guide the discussions. The gathered data from the discussions were transcribed verbatim, and uploaded to the Atlas ti program for data analysis. Themes were identified from the findings of the thematic analysis. Dental educators required some guidance and clarity on the AfriMEDS core competency framework. However, they were able to recognize the competencies related to the AfriMEDS core competency framework. Two of these competencies, evidence-based dentistry, and private practice, were highlighted as core competencies in this current study; however, in AfriMEDS, only certain aspects of this was described

Nutrition education practices of primary school teachers in a resource-constrained community in Gauteng, South Africa

We investigated the nutrition education (NE) practices of teachers of grade 4‒7 learners in 11 primary schools (85% of total number) of the Bronkhorstspruit district (Gauteng Province) to identify opportunities for improving NE in these schools. A descriptive cross-sectional survey was carried out among a convenient sample of the teachers (N = 73) using a structured nutrition education practice questionnaire. Descriptive data analysis was done. Results showed that the majority of the teachers taught nutrition in about 10% to 20% of their teaching time. Thirty percent had no training to teach nutrition, and most teachers (86%) would like to receive training in nutrition. Teachers mostly taught nutrition as part of the curriculum (67%) and very few (18%) integrated nutrition into other subjects. Needing improvement were adequate classroom time for nutrition education delivery, continuing training in nutrition for teachers, and provision of up-to-date instructional materials for teaching nutrition.The University of Pretoria’s Strategic Institutional Research Theme through the Institute for Food, Nutrition and Wellbeing (IFNuW), the Nestle Nutrition Institute Africa (NNIA), and the Association of African Universities (AAU).http://www.tandfonline.com/loi/gefn202017-10-31hb2016Educational PsychologyHuman NutritionPhysiologyScience, Mathematics and Technology Educatio

De novo assembly and annotation of the salivary gland transcriptome of Rhipicephalus appendiculatus male and female ticks during blood feeding

Tick secretory proteins modulate haemostasis, inflammation and immune responses of the host and are attractive recombinant anti-tick vaccine candidates. Yet, many of the proteins have not been characterised due to the limited sequence availability for ticks and other arthropods for homology-based annotation. To address this limitation, we sequenced the salivary glands of the economically important adult male and female Rhipicephalus appendiculatus ticks during feeding. The quality-filtered Illumina sequencing reads were de novo assembled to generate a R. appendiculatus sialotranscriptome of 21,410 transcripts. A non-redundant set of 12,761 R. appendiculatus proteins was predicted from the transcripts, including 2134 putative secretory and 8237 putative housekeeping proteins. Secretory proteins accounted for most of the expression in the salivary gland transcriptome (63%). Of the secretory protein class, the Glycine-rich superfamily contributed 66% and the Lipocalin family 12% of the transcriptome expression. Differential expression analysis identified 1758 female and 2346 male up-regulated transcripts, suggesting varying blood-feeding mechanisms employed between female and male ticks. The sialotranscriptome assembled in this work, greatly improves on the sequence information available for R. appendiculatus and is a valuable resource for potential future vaccine candidate selection.The Economic Competitive Support Programme (30/01/V010) and Incentive Funding for Rated Researchers (NRF-Mans).http://www.elsevier.com/locate/ttbdis2017-06-30hb2016Veterinary Tropical Disease