UWCScholar
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Recent Submissions
Beyond academia: a case for reviews of gray literature for science-policy processes and applied research
(Elsevier, 2024) Yoshida, Yuki; O'Farrell, Patrick; Sitas, Nadia
Gray literature is increasingly considered to complement evidence and knowledge from peer-reviewed literature for science-policy processes and applied research. On the one hand, science-policy assessments need to consider a diversity of worldviews, knowledge types and values from a variety of sectors and actor groups, and synthesize policy-relevant findings that are salient, legitimate and credible. On the other hand, practitioners and scholars conducting applied research are affected by the time lag and biases of academic publication processes. Gray literature holds diverse perspectives informative for science-policy processes as well as practical evidence unfiltered by commercial publication processes. However, its heterogeneity has made it challenging to access through conventional means for a literature review. This paper details one endeavor within the Values Assessment of the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) to review gray literature using Google’s Programmable Search Engine. In the absence of a standardized approach, we build on the limited experiential knowledge base for reviewing gray literature and report on the potential applicability of our strategy for future reviews. Gray literature review results contrast findings of our parallel review of academic literature, underlining the importance of mobilizing different knowledge bases in science-policy assessments, evidence-based practices, and applied research.
How many random observations are needed for good phase coverage of a periodic source?
(Springer Science and Business Media B.V., 2024) Koen, Chris
The specific problem considered is the number of radial velocity measurements required to obtain good estimates of physical parameters of binary star. It is assumed that observations are made at random binary phases. The loss of information due to poor phase coverage is explored, and a suggested limit on the largest acceptable gap introduced. The statistical distribution of maximum gap lengths can then be used to specify the minimum number of velocity measurements to obtain good phase coverage with a specified confidence limit. The effects of non-zero orbital eccentricity are discussed, as are the ramifications of having multiple binary targets. The theory is also applicable to the characterisation of the radial velocity curves induced by exoplanets on their host stars, provided that the periods and eccentricities are known (from e.g. transit observations)
Intervertebral disc degenerative disease in South Africa: a case-control analysis of selected gene variants
(Springer Nature, 2024) Pearce, Keenau; Less, Stephanie; Benjeddou, Mongi
Intervertebral disc (IVD) degenerative disease is a multifactorial disease for which genetics plays an integral role. Several genes, and their variants, associated with the development and progression of IVD degenerative disease have been identified. While several studies have investigated these genes in Asian and European populations, no available evidence exists for the South African population. Therefore, this study aimed to investigate these parameters.
Academic career management intervention at a South African university: A modified Delphi study
(AOSIS (pty) Ltd, 2023) Barnes, Nina; du Plessis, Marieta; Frantz, Jose M
Orientation: Understanding the components for an academic career management intervention programme, to enable the development of the required academic pipeline to achieve the strategic objectives of higher education institutions. Research purpose: A consensus view across subject experts for a career management intervention programme to enable the progression of academic careers. Motivation for the study: While academic career literature captures an array of normative designs of career management programmes to cultivate the required academic talent consortium, literature indicates a lack of a comprehensive and systematic approach for career management to provide a framework for successfully managing academic careers. Research design, approach and method: A modified Delphi technique was employed, by presenting an expert panel with the findings of a broader research project to initiate the consensus-seeking methodology-a systematic approach to obtain concordance on the experts’ opinions through two rounds of structured questionnaires. Main findings: The identified components are structured and presented in five main themes (categories), including: (1) institutional, (2) individual, (3) overlapping, (4) cultural and (5) external.
Salinity modulates morpho-physiology, biochemical and antioxidant defence system in Tetragonia decumbens Mill.: a neglected wild leafy vegetable in South Africa
(Springer, 2024) Barker, Adelé Mariska
Tetragonia decumbens is an edible halophyte that grows naturally in saline environment; however, its tolerance mechanisms are poorly understood for bio-saline agriculture. So, this research was designed to look into how salinity affects vegetative growth, leaf succulence, chlorophyll content, cation accumulation, oxidative stress indicators, and antioxidative defence mechanisms involved in the salt tolerance of T. decumbens. Saline conditions were prepared by dissolving sodium chlorine (NaCl) in the nutritive solution. The control was maintained and only watered with nutrient solution while the tested treatments contained graded NaCl doses (250, 200, 150, 100, and 50 mM). Results revealed a substantial enhancement in shoot length, number of branches, relative water content, as well as total fresh weight in plants irrigated with 50 and 100 mM NaCl in comparison to the control, while higher saline concentrations (150–250 mM NaCl) reduced plant growth and chlorophyll content. Similarly, these high salt concentrations induced more severe oxidative stress indicated by high amounts of superoxide, cell death viability and malondialdehyde, with the most pronounced effect at the highest NaCl concentration (250 mM). Nevertheless, T. decumbens modulated various defence mechanisms with increasing salinity stress, these include the upregulation of superoxide dismutase, catalase, polyphenols, flavonoids, proanthocyanidins and the build-up of sodium ions in the leaves. These results show that T. decumbens can withstand salinity by modifying its morpho-physiological traits, antioxidant defence systems, and managing ion toxicity and oxidative stress efficiently, since all plants withstand salinity without showing signs of toxicity.