Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 54-73 of 4818
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A study of the molecular interactions between ammonium-based ionic liquids and N,N-dimethylacetamide
(Elsevier, 2016)In this work, we report the molecular interactions of different cation alkyl chain lengths with same anion of ammonium-based ionic liquids (ILs) such as tetraethylammonium hydroxide (TEAH), tetrapropylammonium hydroxide ... -
A substance use prevention programme focusing on resilience as a protective factor for adolescents in the North West Province of South Africa
(Kamla-Raj, 2017)Adolescents' substance use needs to be identified and addressed as soon as possible and substance use among adolescents needs to be prevented. The purpose of this study was to develop a substance use prevention programme ... -
A survey of production systems, management and marketing strategies for Tswana Goats in Semiarid areas around Mafikeng, North West Province
(Kamla-Raj, 2016)Goat production in communal areas is faced with numerous challenges which may differ with geographical locations. Marketing of goats in North West province has a potential to help diversify the economy and alleviate poverty ... -
A theoretical analysis of the dynamics of AIDS and random condom use
(SAS International Publications, 2017) -
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 ...