Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 58-77 of 4825
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A theoretical study on the antioxidant properties of methoxy-substituted chalcone derivatives: a case study of kanakugiol and pedicellin through their Fe (II and III) coordination ability
(World Scientific Publishing, 2016)A theoretical study on the antioxidant properties of two chalcone derivatives, kanakugiol and pedicellin, is performed by considering their Fe2+ and Fe3+ coordination ability. The objective of the study is to elucidate the ... -
A unified inverse scattering transformation for the local and nonlocal nonautonomous Gross-Pitaevskii equations
(AIP, 2017)We present the inverse scattering transformation for a nonisospectral AKNS hierarchy in which the spectral parameter is determined by an ordinary differential equation with polynomial nonlinearity, and thus, we give a ... -
Aalwurms by sojabone raak al hoe erger
(Netwerk24, 2020)Die toename in aalwurms wek kommer in die sojaboonbedryf. Namate die produksie styg, neem die blootstelling aan siektes en plae ook toe. Wisselbou en kultivars met genetiese weerstand is dalk nie doeltreffend genoeg om ... -
An AB initio model for cosmic-ray modulation
(IOP Publishing, 2013)A proper understanding of the effects of turbulence on the diffusion and drift of cosmic rays (CRs) is of vital importance for a better understanding of CR modulation in the heliosphere. This study presents an ab initio ... -
An AB initio model for the modulation of galactic cosmic-ray electrons
(IOP Publishing, 2013)The modulation of galactic cosmic-ray electrons is studied using an ab initio three-dimensional steady state cosmicraymodulation code in which the effects of turbulence on both the diffusion and drift of these cosmic-rays ... -
Abalone growth and associated aspects: now from a metabolic perspective
(Wiley, 2018)Worldwide, there are approximately 100 Haliotis species, more commonly known as abalone or ‘Paua’ in New Zealand, ‘Venus's‐ears’ in Greece, ‘Awabi’ in Japan, ‘Perlemoen’ in South Africa and ‘Ormers’ in Europe. Regardless ... -
Aberrant synthesis of ATP synthase resulting from a novel deletion in mitochondrial DNA in an African patient with progressive external ophthalmoplegia
(Springer, 2010)A young, adult, African male patient presented with progressive proximal muscle weakness, external ophthalmoplegia and ptosis, as well as cardiac conduction abnormalities resembling Kearns–Sayre syndrome (KSS). Magnetic ... -
The ablation of gas clouds by blazar jets
(EDP Sciences, 2020)Context. Flaring activity in blazars can last for vastly different timescales, and it may be the result of density enhancements in the jet flow that result from the intrusion of an interstellar cloud into the jet. Aims. ... -
Abnormal tricarboxylic acid cycle metabolites in isovaleric acidaemia
(Springer, 2009)Background Although a number of abnormal diagnostic metabolites have previously been described in the urine of patients with isovaleric acidaemia (IVA), they do not fully explain the clinical symptoms associated with this ... -
Above-cloud aerosol optical depth from airborne observations in the southeast Atlantic
(EGU, 2020)The southeast Atlantic (SEA) region is host to a climatologically significant biomass burning aerosol layer overlying marine stratocumulus. We present the first results of the directly measured above-cloud aerosol optical ... -
The absence of diffusion in the South African short rate
(SASA, 2019)In the field of Financial Mathematics, stochastic differential equations are used to describe the dynamics of interest rates. An example is a model for the short rate, which is a mathematically defined rate not directly ... -
Absolute reflectance of a concave mirror used for astro-particle physics experiments
(Elsevier, 2019)The absolute reflectance of a reflector and its point spread function are the key parameters of a telescope for measuring light flux. Typically, one is using low-cost technologies for producing mirrors for the needs of ... -
Abundance and diversity of plant-parasitic nematodes associated with watermelon in Nigeria, with focus on Meloidogyne spp.
(Brill, 2020)Little information is available for nematode pests associated with watermelon in sub-Saharan Africa (SSA). This study recorded the abundance and prevalence of plant-parasitic nematodes from 25 localities across south-west ... -
Abundance ratios and IMF slopes in the dwarf elliptical galaxy NGC 1396 with MUSE
(Oxford Univ Press, 2016)Deep observations of the dwarf elliptical (dE) galaxy NGC 1396 (MV = −16.60, Mass ∼4 × 108 M⊙), located in the Fornax cluster, have been performed with the Very Large Telescope/Multi Unit Spectroscopic Explorer spectrograph ... -
Abundance ratios in dwarf elliptical galaxies
(Oxford Univ Press, 2018)We determine abundance ratios of 37 dwarf ellipticals (dEs) in the nearby Virgo cluster. This sample is representative of the early-type population of galaxies in the absolute magnitude range −19.0 < Mr < −16.0. We analyse ... -
Abundant interaction solutions of the KP equation
(SpringerSpringer, 2017)Based on the Hirota bilinear form of the KP equation, five classes of interaction solutions between lumps and line solitons are generated via Maple symbolic computations. Analyticity is automatically guaranteed for the ... -
Academic publishing in disaster risk reduction: past, present, and future
(Wiley, 2020)Nowadays there are approximately 80 Anglophone journals that deal primarily with disaster risk reduction (DRR) and allied fields. This large array signals a sustained, if uneven, growth in DRR scholarship but also competition ... -
Accelerating high-energy pulsar radiation codes
(IOP Publishing, 2010)Curvature radiation (CR) is believed to be a dominant mechanism for creating gamma-ray emission from pulsars and is emitted by relativistic particles that are constrained to move along curved magnetic field lines. Additionally, ... -
Acceleration of galactic electrons at the solar wind termination shock and Voyager 1 observations
(PoS, 2017)Diffusive shock acceleration (DSA) , as an acceleration process for G alactic electrons at the solar wind termination shock (TS) , is investigated with a comprehensive numerical model which ... -
Acceleration of petaelectronvolt protons in the Galactic Centre
(Nature Publishing Group, 2016)Galactic cosmic rays reach energies of at least a few petaelectronvolts1 (of the order of 1015 electronvolts). This implies that our Galaxy contains petaelectronvolt accelerators (‘PeVatrons’), but all proposed models of ...