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A spatially resolved spectral analysis of giant radio galaxies with Meerkat
(Oxford University Press, 2025) Jarvis, Matthew J.; An, Fangxia; Whittam, Imogen Helen
In this study we report the spatially resolved, wideband spectral properties of three giant radio galaxies (GRGs) in the COSMOS field: MGTC J095959.63+024608.6, MGTC J100016.84+015133.0, and MGTC J100022.85+031520.4. One of these galaxies, MGTC J100022.85+031520.4, is reported here for the first time, with a projected linear size of 1.29 Mpc at a redshift of 0.1034. Unlike the other two, it is associated with a brightest cluster galaxy (BCG), making it one of the few GRGs known to inhabit cluster environments. We examine the spectral age distributions of the three GRGs using new MeerKAT UHF-band (544–1088 MHz) observations, and L-band (900–1670 MHz) data from the MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) survey. We test two models of spectral ageing, the Jaffe–Perola and Tribble models, using the Broadband Radio Astronomy Tools (brats) software, and find that they agree well with each other. We estimate the Tribble spectral age for MGTC J095959.63+024608.6 as 68 Myr, for MGTC J100016.84+015133.0 as 47 Myr, and for MGTC J100022.85+031520.4 as 67 Myr. We find significant disagreements between these spectral age estimates and the estimates of the dynamical ages of these GRGs, modelled in cluster and group environments. Our results highlight the need for additional processes that are not accounted for in either the dynamic age or the spectral age estimations. © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.
Digital health readiness – insights from healthcare leaders in operational management: a cross-sectional survey
(BioMed Central Ltd, 2025) Steenkamp, Ilze; Chipps, Jennifer; Peltonen, Laura Maria
Background: Developing countries’ public health systems struggle with digital health implementation, and reports of low digital health readiness exist within the workforce. This study investigates the perceived digital health readiness of healthcare leaders in operational management to implement digital health tools. Methods: A cross-sectional survey using the E-Ready 2.0 scale was used to measure digital health readiness (n = 329) in 11 hospitals in the Western Cape, South Africa (September 2023 – March 2024). Descriptive statistics summarised respondent characteristics and the E-Ready 2.0 subscales: conditions for change at the workplace and among individuals, support and engagement from management, colleagues’ readiness, consequences for the status quo and workplace attitudes. Statements scoring 60% or more were considered to have higher readiness. Chi-square and Mann–Whitney U tests were used to examine associations between demographic variables and subscale statements. Results: A total of 143 healthcare leaders responded (56.1% response rate) (n = 114 nurses [79.7%], n = 29 medical doctors [20.3%]). The average age was 46.4 ± 10.0 years. Overall, higher levels of readiness (above 70%) were observed with statements related to workplace attitudes, whereas conditions for change at the workplace and among individuals showed lower readiness (below 50%). Conclusion: Despite significant investment in digital health tools, there remains limited digital health readiness among those responsible for leading these implementations. © The Author(s) 2025.
An assessment of compliance with proposed regulations to restrict on-package marketing of packaged foods to improve nutrition in South Africa
(BioMed Central Ltd, 2025) Abdool Karim, Safura; Frank, Tamryn; Khan, Alice Scaria; Tlhako, Morongoa Glenda; Joni, Sikhumbule Kagiso; Swart, Elizabeth Catherina
Background: Ultra-processed products (UPPs), high in sugar, fat and sodium, contribute to increasing burdens of obesity and non-communicable diseases in South Africa (SA). Increased consumption and acceptability of UPPs is driven, in part by aggressive marketing. Front of package labelling laws, particularly warning labels (WLs) coupled with marketing restrictions, have been recommended to improve consumer awareness of unhealthy products, incentivise reformulation and underpin other interventions. The SA government published a draft regulation to introduce WLs and restrict marketing, called R3337. This study aims to analyse on-package marketing and create a baseline to evaluate compliance with the proposed R3337. Methods: This study is an analysis of a dataset of 6768 packaged food products, collected as pictures of products in four major grocery stores in Cape Town, SA between March and July 2019. A codebook was developed based on R337. The codebook was used to identify and assess child-directed marketing (CDM) and health claims on products potentially subject to front-of-package WLs. Food packages and their nutritional information were coded and analyzed to determine whether the product would be required to carry a WL and whether the package included regulated marketing. Results: The majority (80.16%) of products analyzed would require WLs under R3337 due to high levels of sugar, sodium, or saturated fat. CDM was prevalent, with 59.26% of products displaying some form of marketing, primarily animated characters and depictions of children. Health claims were also common, with 83% occurring on WL products. Discussion: Using a WL system in SA could effectively target common forms of on-package marketing of unhealthy products, given the high prevalence of CDM and health claims on products likely to carry WLs. Such interventions may contribute to improving diets and reducing UPP consumption. Some forms of CDM are not regulated under R3337 and we recommend expanding the regulation to include these. This study provides a baseline which should be used for future research to evaluate R3337 when it is implemented.
Diatom colonisation and biofilm metal bioaccumulation: can indigenous knowledge systems aid the ecological engineering of urban coastlines?
(Elsevier B.V, 2025) Cotiyane-Pondo, Phumlile; Ndaba, Jabulani; Human, Lucienne
Marine engineered structures alter the coastal ecosystems' functionality, replacing natural substrates with flat surfaces, often negatively impacting biodiversity. While providing coastal protection, artificial structures can hinder the initial colonisation by biofilm and the recruitment of coastal species. Greening the grey infrastructure through nature-based interventions is increasingly used to enhance biodiversity in artificial structures. This study explores the potential of the sedge Cyperus textilis and its Indigenous Knowledge applications as a substrate for coastal eco-engineering at an urbanised site on the southeast coast of South Africa. Diatom succession and metal bioaccumulation on the deployed trial-version designs (imizi structures) were monitored for a month, with samples collected at six, twelve, twenty-four, seventy-two hours, one and two weeks, and one month after deployment. Water quality, including dissolved nutrients and metal concentrations, were assessed near the substrates. Findings indicated that diatom colonisation occurred within twelve hours, with initial species including Fragilaria pulchella, Neofragilaria nicobarica, Navicula sp. and Grammatophora undulata, followed by a significant increase (4.6 times) in species diversity from 5 to 23 diatoms after one week. Metal bioaccumulation of aluminium, iron, zinc, manganese and arsenic was higher in the biofilm developing on the substrate compared to its surrounding environment (imizi substrate and water), suggesting the potential bioremediating capabilities of the biofilm on the nature-based material. These findings indicate the potential suitability of using Indigenous Knowledge-based materials for coastal eco-engineering practices as promoters of primary productivity, with the added potential of the plant C. textilis for bioremediation of toxic metals such as arsenic.
A meta-analysis of the relationship between problem-solving appraisal as assessed by the problem solving inventory and suicide ideation
(Routledge, 2025) Padmanabhanunni, Anita; Pretorius, Tyrone
Suicide is a significant public health concern globally, and deficits in problem-solving ability have been identified as an important risk factor for suicide. Through a comprehensive meta-analysis, this study aims to quantitatively synthesize the relationship between self-appraised problem-solving ability as measured by the Problem-solving Inventory (PSI) and suicidal ideation as indicated by measures of hopelessness and suicidal thoughts. The heterogeneity metrics suggested that the PSI and its subscales relate to suicide-related variables, though the strength and direction of these relationships vary across studies and populations. Despite this variability, the total PSI scale demonstrated the strongest combined effect, indicating its potential utility in suicide risk assessment. There were no significant moderating effects of age or gender composition across the studies, indicating that the relationship between perceived problem-solving abilities and suicide-related outcomes is consistent across age and gender groups. The strong association between perceived problem-solving competencies and reduced hopelessness highlights the potential of targeted interventions to enhance these skills. Such interventions could form a vital component of suicide-prevention strategies, aimed at bolstering the ability to cope with stress and adversity.