Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 1366-1385 of 4825
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The effect of different host plants on development and survival of Nysius natalensis (Hemiptera: Orsillidae)
(Oxford University Press, 2015)Nysius natalensis Evans (Hemiptera: Orsillidae) is a pest of sunflower in South Africa. Adults invade sunflower fields from their weedy hosts. The host plant suitability for development and survival and the effect of ... -
The effect of different host plants on the reproduction and longevity of Nysius natalensis
(Wiley-Blackwell, 2012)Nysius natalensis Evans (Hemiptera: Orsillidae) is a pest of sunflower in South Africa. Adults invade sunflower fields from their weedy hosts which occur inside crop fields and on surrounding headlands. The host plant ... -
The effect of different magnetospheric structures on predictions of gamma-ray pulsar light curves
(SAIP, 2014)The second pulsar catalogue of the Fermi Large Area Telescope (LAT) will contain in excess of 100 gamma-ray pulsars. The light curves (LCs) of these pulsars exhibit a variety of shapes, and also different relative phase ... -
The effect of different magnetospheric structures on predictions of gamma-ray pulsar light curves
(South African Institute of Physics, 2012)The second pulsar catalogue of the Fermi Large Area Telescope (LAT) will contain in excess of 100 gamma-ray pulsars. The light curves (LCs) of these pulsars exhibit a variety of shapes, and also different relative phase ... -
Effect of different water regimes on nematode reproduction, root galling, plant growth and yield of lowland and upland Asian rice varieties grown in two soil types infested by the rice root–knot nematode Meloidogyne graminicola
(Russian Academy of Sciences, 2015)In a screenhouse experiment, plants of the lowland rice variety Thihtayin and the upland rice variety Kone Myint 2 were grown in two soil types (clay loam and sandy loam), inoculated with 3,000 Meloidogyne graminicola ... -
The effect of diffusion on the particle spectra in pulsar wind nebulae
(IOP Publishing, 2013)A possible way to calculate particle spectra as a function of position in pulsar wind nebulae is to solve a Fokker–Planck transport equation. This paper presents numerical solutions to the transport equation with the ... -
The effect of drift on the evolution of the electron/positron spectra in an axisymmetric pulsar wind nebula
(IOP Publishing, 2014)Charged particles propagating through a structured magnetic field are subject to drift motion. The primary aim of the present paper is therefore to investigate the effects of gradient, curvature, and neutral sheet drift ... -
Effect of drying method on the chemical composition of leaves from four tropical tree species
(University of West Indies Press, 2014)Drying techniques are an important variable in forage evaluation because they affect the accuracy with which the composition of fresh plant material is determined. This study investigated the effect of five drying methods ... -
Effect of dung and dung beetle application on topsoil fungal assemblage of a post-coal mining reclamation land: Towards soil health improvement
(Elsevier B.V., 2023)Soil management practices such as organic matter input can ameliorate soil health, including microbial com munities that are crucial for ecological processes. In this study, the effect of successive application of cattle ... -
Effect of extension service(s) and socio-economic characteristics on the livelihood of Nguni cattle development project beneficiaries in North West Province: a tobit-ols regression approach
(South African Society of Agricultural Extension (SASAE), 2017)The place of extension and advisory service(s) in enhancing farmer's knowledge, skills, as well as technologies cannot be overemphasised. This study was carried out in the North West Province of South Africa, with the aim ... -
Effect of fly ash addition on the removal of hydrogen sulfide from biogas and air on sewage sludge-based composite adsorbents
(Elsevier, 2008)Desulfurization adsorbents were prepared from the mixtures of various compositions of New York City sewage sludge and fly ashes from SASOL, South Africa, by pyrolysis at 950 °C. The resulting materials were used as adsorbents ... -
Effect of graded levels of dietary seaweed (Ulva sp.) on growth, hematological and serum biochemical parameters in dusky kob, Argyrosomus japonicus, sciaenidae
(Elsevier, 2017)This study was designed to assess the effect of incorporating graded levels of green macroalgae seaweed (Ulva sp.) into diets of juvenile dusky kob (Argyrosomus japonicus) on growth performance, hematology and serum ... -
Effect of H2S on SO2-depolarised water electrolysis
(Elsevier, 2015)The performance of a PEM SO2 electrolyser, used for the production of H2 gas and liquid H2SO4, was evaluated when the feed was contaminated with hydrogen sulfide. Transient voltage response at constant current density and ... -
Effect of Infection by Metarhizium anisopliae (Hypocreales: Clavicipitaceae) on the feeding and oviposition of the pea leafminer Liriomyza huidobrensis (Diptera: Agromyzidae) on different host plants
(Elsevier Science, 2011)The effect of fungal infection by Metarhizium anisopliae on feeding and oviposition of adult Liriomyza huidobrensis was examined on three host plants, faba bean (Vicia faba), French bean (Phaseolus vuklgaris) and snow pea ... -
Effect of methyl substituent in pyridine on the spectral and thermal properties of pyridyl adducts of Zn(II) and Cd(II) dithiocarbamate
(Elsevier, 2013)Four novel pyridine and 2-methyl pyridine adducts of Zn(II) and Cd(II) N-methyl-N-phenyl dithiocarbamates, [Zn(mpdtc)2py], [Zn(mpdtc)2mpy], [Cd(mpdtc)2py2], and [Cd(mpdtc)2mpy] (mpdtc = N-methyl-Nphenyl dithiocarbamates, ... -
The effect of molar ratio and flow velocity on the surface area required for pertraction of a Zr/Hf mixture
(IOP, 2019)Zirconium (Zr) and hafnium (Hf) need to be separated before being used in nuclear applications. Equilibria data have shown that Hf can be selectively extracted over Zr from a sulphate medium using organophosphorus ... -
The effect of myalgic encephalomyelitis/ chronic fatigue syndrome (ME/CFS) severity on cellular bioenergetic function
(Public Library of Science, 2020)Myalgic encephalomyelitis/ Chronic fatigue syndrome (ME/CFS) has been associated with abnormalities in mitochondrial function. In this study we have analysed previous bioenergetics data in peripheral blood mononuclear cells ... -
Effect of nanoparticle metal composition: mono- and bimetallic gold/copper dendrimer stabilized nanoparticles as solvent-free styrene oxidation catalysts
(Springer, 2018)A range of mono- and bimetallic AumCun nanoparticles (NPs), with varying metal compositions, was prepared by using a third-generation diaminobutane poly(propylene imine) (G3 DAB-PPI) dendrimer, modified with alkyl chains, ... -
The effect of nest site orientation on the breeding success of blue swallows Hirundo atrocaerulea in South Africa
(Wiley, 2018)The globally threatened blue swallow Hirundo atrocaerulea, with <1500 pairs remaining, is an intra-African migrant, breeding in eight countries in East Africa and Southern Africa, with nonbreeding birds in four countries ... -
The effect of ozone and drought on the photosynthetic performance of canola
(Elsevier, 2018)Canola plants were fumigated in open-top chambers with ozone (O3) (120 ppb) under well-watered (WW) and water-stressed (WS) conditions for 4 weeks. Non-fumigated plants were also studied to facilitate comparison between ...