Faculty of Natural Sciences: Recent submissions
Now showing items 261-280 of 2572
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In-vitro cytotoxicity, anti-bacterial and anti-inflammatory activities of ecklonia radiataand jania verrucosafrom Eastern Cape, South Africa
(University of Benin, 2022)Seaweeds are marine floras constituting in part to over 90% of the oceanic biomass. Despite the enrichments of seaweeds, their potentials are largely unexplored. Hence, this study evaluated the phytochemical screening, ... -
Chitosan-coated liposomes of Carissa spinarum extract: synthesis, analysis and antipneumococcal potency
(ICE Publishing, 2023)In the present study, a chitosan-coatedCarissa spinarum-polyphenol-loaded liposome (LipCsP-chitosan) nanocarrierwas fabricated for the delivery ofC. spinarumpolyphenols (CsPs) to improve the bioavailability ... -
Selectivity of oxygen evolution reaction on carbon cloth-supported δ-mno2 nanosheets in electrolysis of real seawater
(Molecules, 2023)Electrolysis of seawater using solar and wind energy is a promising technology for hydrogen production which is not affected by the shortage of freshwater resources. However, the competition of chlorine evolution reactions ... -
Photovoltaic efficiencies of microwave and Cu2ZnSnS4 (CZTS) superstrate solar cells
(Materials Today Sustainability, 2023)Organic and inorganic materials such as perovskites, copper indium gallium diselenide, cadmium telluride, and copper zinc tin sulfide/selenide (CZTS/Se) have been employed to capture unlimited sunlight through the photovoltaic ... -
The LOFAR Tied-Array All-Sky Survey: Timing of 35 radio pulsars and an overview of the properties of the LOFAR pulsar discoveries
(Astronomy& Astrophysics, 2023)The LOFAR Tied-Array All-Sky Survey (LOTAAS) is the most sensitive untargeted radio pulsar survey performed at low radio frequencies (119−151 MHz) to date and has discovered 76 new radio pulsars, including the 23.5-s pulsar ... -
A search for variable subdwarf B stars in TESS Full Frame Images III. An update on variable targets in both ecliptic hemispheres – contamination analysis and new sdB pulsators
(Oxford University Press, 2023)We present an update on the variable star survey performed on the TESS 30 min Full Frame Image (FFI) data reported by our first two papers in this series. This update includes a contamination analysis in order to identify ... -
Dispersal and coastal geomorphology limit potential for mangrove range expansion under climate change
(Wiley, 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 ... -
Progress in the remote sensing of groundwater-dependent ecosystems in semi-arid environments
(Elsevier, 2021)Remote sensing of groundwater-dependent ecosystems (GDEs) has increased substantially in recent years. Of significant prominence, is the delineation and mapping of groundwater-dependent vegetation (GDV), species diversity, ... -
Efficient Long-range Active Galactic Nuclei (AGNs) Feedback Affects the Low-redshift Lyα Forest
(American Astronomical Society, 2023)Active galactic nuclei (AGNs) feedback models are generally calibrated to reproduce galaxy observables such as the stellar mass function and the bimodality in galaxy colors. We use variations of the AGN feedback implementations ... -
Interferometric H I intensity mapping: perturbation theory predictions and foreground removal effects
(Oxford University Press, 2023)We provide perturbation theory predictions for the H I intensity mapping power spectrum multipoles using the Effective Field Theory of Large Scale Structure, which should allow us to exploit mildly non-linear scales. ... -
A multi-proxy provenance study of late carboniferous to middle Jurassic sandstones in the Eastern Sverdrup basin and its bearing on arctic palaeogeographic reconstructions
(MDPI, 2023)A multi-proxy provenance study of Late Carboniferous to Middle Jurassic sandstones from the eastern Sverdrup Basin was undertaken employing optical petrography and heavy mineral analysis, chemical analysis of apatite, ... -
Influence of Synthesis Method on Structural, Morphological, Magnetic, and Antimicrobial Properties of Fe-Ag Nanoparticles
(Journal of Inorganic and Organometallic Polymers and Materials, 2023)This contribution reports on the development of two versatile and efficient methods, namely the green and gamma radiolysis for Fe-Ag nanoparticles (NPs) synthesis, characterization, and further their growth inhibition ... -
Why do we need to care about transboundary aquifers and how do we solve their issues?
(SpringerLink, 2023)As the reliance on transboundary groundwater is increasing globally, it is important to understand and address the specifc issues raised by the assessment and management of transboundary aquifers (TBAs). Building on 20 ... -
Biocontrol Potential of Bacillus subtilis and Bacillus tequilensis against Four Fusarium Species
(MDPI, 2023)The use of biological control agents as opposed to synthetic agrochemicals to control plant pathogens has gained momentum, considering their numerous advantages. The aim of this study is to investigate the biocontrol ... -
The Importance of Eurekan Mountains on Cenozoic Sediment Routing on the Western Barents She
(MDPI, 2023)The importance of topography generated by Eocene Eurekan deformation as a sediment source for sandstones deposited on the western Barents Shelf margin is evaluated through a sediment provenance study conducted on wellbore ... -
Use of a rat ex-vivo testis culture method to assess toxicity of select known male reproductive toxicants
(Elsevier, 2016)Due to the complex physiology of the testes, in vitro models have been largely unsuccessful at modeling testicular toxicity in vivo. We conducted a pilot study to evaluate the utility of the Durand ex vivo rat seminiferous ... -
Revisiting the [C ii]158𝝁��m line-intensity mapping power spectrum from the EoR using non-uniform line-luminosity scatter
(Oxford University Press, 2023)Detecting the line-intensity mapping (LIM) signal from the galaxies of the Epoch of Reionization is an emerging tool to constrain their role in reionization. Ongoing and upcoming experiments target the signal fluctuations ... -
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, 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 ... -
Review of in-situ and remote sensing-based indices and their applicability for integrated drought monitoring in South Africa
(MDPI, 2023)The devastating socioeconomic impacts of recent droughts have intensified the need for improved drought monitoring in South Africa (SA). This study has shown that not all indices can be universally applicable at all ... -
The MeerKAT pulsar timing array: First data release
(Oxford University Press, 2022)We present the first 2.5 years of data from the MeerKAT Pulsar Timing Array (MPTA), part of MeerTime, a MeerKAT Large Survey Project. The MPTA aims to precisely measure pulse arrival times from an ensemble of 88 pulsars ...