Faculty of Natural Sciences: Recent submissions
Now showing items 1-20 of 2571
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Multipole expansion for 21 cm intensity mapping power spectrum: forecasted cosmological parameters estimation for the ska observatory
(Oxford University Press, 2023)The measurement of the large-scale distribution of neutral hydrogen in the late Universe, obtained with radio telescopes through the hydrogen 21 cm line emission, has the potential to become a key cosmological probe in the ... -
The trapum l-band survey for pulsars in fermi-lat gamma-ray sources
(Oxford University Press, 2023)More than 100 millisecond pulsars (MSPs) have been discovered in radio observations of gamma-ray sources detected by the Fermi Large Area Telescope (LAT), but hundreds of pulsar-like sources remain unidentified. Here, we ... -
The effects of Jurassic igneous intrusions on the generation and retention of gas shale in the lower permian source-reservoir shales of karoo basin, South Africa
(Elsevier B.V, 2023)Shale gas potential of the Whitehill Formation (Permian), Karoo Basin, South Africa is strongly influenced by widespread Jurassic igneous intrusions. A high-resolution organic petrographic and geochemical study is reported ... -
MIGHTEE-H I: the first MeerKAT H I mass function from an untargeted interferometric survey
(Oxford University Press, 2023)We present the first measurement of the H I mass function (HIMF) using data from MeerKAT, based on 276 direct detections from the MeerKAT International GigaHertz Tiered Extragalactic Exploration (MIGHTEE) Survey Early ... -
Unveiling the inhibitory potentials of peptidomimetic azanitriles and pyridyl esters towards sars-cov-2 main protease: a molecular modelling investigation
(MDPI, 2023)The severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) is responsible for COVID-19, which was declared a global pandemic in March 2020 by the World Health Organization (WHO). Since SARS-CoV-2 main protease plays ... -
Beta decay along the n=z line and its relevance in rp-process and x-ray bursts
(EDP Sciences, 2023)Nucleosynthesis in Type I X-ray bursts (XRB) proceeds eventually through the rp-process near the proton drip-line. Several N=Z nuclei act as waiting points in the reaction network chain. Astrophysical calculations of XRB ... -
Dispersal and coastal geomorphology limit potential for mangrove range expansion under climate change
(John Wiley and Sons Inc, 2022)Latitudinal range limits for mangroves on high-energy, wave-dominated coasts are controlled by geomorphological features and estuarine dynamics. Mangroves reach a southern global range limit along the South African coastline, ... -
Understanding climate change effects on the potential distribution of an important pollinator species, ceratina moerenhouti (apidae: ceratinini), in the eastern afromontane biodiversity hotspot, Kenya
(Elsevier Ltd, 2023)Monitoring key pollinator taxa such as the genus Ceratina requires precise near real-time predictions to facilitate better surveillance. The potential habitat suitability of Ceratina moerenhouti was predicted in the Eastern ... -
Seed priming with MeJa prevents salt-induced growth inhibition and oxidative damage in sorghum bicolor by inducing the expression of jasmonic acid biosynthesis genes
(Multidisciplinary Digital Publishing Institute (MDPI), 2023)Salinity is one of the major detrimental abiotic stresses at the forefront of deterring crop productivity globally. Although the exogenous application of phytohormones has formerly proven efficacious to plants, their effect ... -
The h i in ring galaxies survey (h i -rings) - effects of the bar on the h i gas in ring galaxies
(Cambridge University Press, 2023)We present a new high-resolution neutral atomic hydrogen (Hi) survey of ring galaxies using the Australia Telescope Compact Array (ATCA). We target a sample of 24 ring galaxies from the Buta (1995) Southern Ring Galaxy ... -
The total rest-frame UV luminosity function from 3 < z < 5: a simultaneous study of agn and galaxies from −28 < MUV < −16
(Oxford University Press, 2023)We present measurements of the rest-frame ultraviolet luminosity function (LF) at redshifts z = 3, z = 4, and z = 5, using 96894, 38655, and 7571 sources, respectively, to map the transition between active galactic nuclei ... -
Recent advancements in the breeding of sorghum crop: current status and future strategies for marker-assisted breeding
(Frontiers, 2023)Sorghum is emerging as a model crop for functional genetics and genomics of tropical grasses with abundant uses, including food, feed, and fuel, among others. It is currently the fifth most significant primary cereal crop. ... -
Copper-modified carbon nano-onions as electrode modifiers for the electroanalysis of the antiretroviral drug efavirenz
(Elsevier Ltd, 2023)The high prescription and consumption rate of antiretroviral drugs (ARV) such as Efavirenz (EFV) in South Africa for the treatment of the human immunodeficiency virus (HIV) has resulted in its presence in wastewater and ... -
Evaluation of synergistic anticandidal activity of galenia africana extract and fluconazole against candida albicans and candida glabrata
(Elsevier, 2022-03)Candida infections have increased in recent years and are causing a serious public health concern. In addition, Candida species are becoming resistant to numerous antifungal drugs. It is for this reason that alternative ... -
Effect of different irrigation systems on water use partitioning and plant water relations of apple trees growing on deep sandy soils in the mediterranean climatic conditions, South Africa
(Elsevier, 2023)All commercial apple fruit (Malus Domestica (Borkh) exported from semi-arid regions are grown under irrigation with drip and micro sprinkler systems being the most widely used. Few studies have directly compared the ... -
An efficient numerical method for pricing double-barrier options on an underlying stock governed by a fractal stochastic process.
(MDPI, 2023)After the discovery of the fractal structures of financial markets, enormous effort has been dedicated to finding accurate and stable numerical schemes to solve fractional Black-Scholes partial differential equations. This ... -
Multi-objective optimization of a metal hydride reactor coupled with phase change materials for fast hydrogen sorption time
(Elsevier, 2023)Recently, the utilization of phase change materials (PCM) for the heat storage/recovery of the metal hydride's reaction heat has received increasing attention. However, the poor heat management process makes hydrogen ... -
The crystal structure of fac-tricarbonyl((pyridin-2-yl)methanamino-κ2N,N′)-((pyridin-2-yl)methanamino-κN)rhenium(I) nitrate,C15H16O3N4Re
(De gruyter, 2023)Abstract: C15H16O3N4Re, triclinic, P1̄ (no. 2), a = 7.4939(2) Å, b = 10.1316(2) Å, c = 13.8351(3) Å, α = 103.453(2)°, β = 101.992(2)°, γ = 107.880(2)°, V = 926.98(4) Å3, Z = 2, Rgt(F) = 0.0341, wRref(F2) = 0.0861, T = 150 K. -
Overview of the effects of moringa oleifera leaf extract on oxidative stress and male infertility: a review
(MDPI, 2023)According to a recent report by the WHO, 50–80 million people suffer with infertility. Amongst these populations, male counterparts account for 20–50% of infertility cases. The aetiology of infertility in men includes many ... -
Controversy and consensus on indications for sperm dna fragmentation testing in male infertility: a global survey, current guidelines, and expert recommendations
(Korean Society for Sexual Medicine and Andrology, 2023)Purpose: Sperm DNA fragmentation (SDF) testing was recently added to the sixth edition of the World Health Organization laboratory manual for the examination and processing of human semen. Many conditions and risk factors ...