Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 3627-3646 of 4817
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QoS performance analysis of bit rate video streaming in next generation networks using TCP, UDP and a TCP+UDP hybrid
(University of the Witwatersrand, 2016)The growth in users streaming videos on the Internet has led to increased demand for improved video quality and reception. In next generation networks (NGNs), such as 3G and 4G LTE, quality of service (QoS) implementation ... -
QTL mapping for resistance to and tolerance for the rice root-knot nematode, Meloidogyne graminicola
(BioMed Central, 2018)Background The root-knot nematode Meloidogyne graminicola is an obligate biotrophic pathogen considered to be the most damaging nematode species that causes significant yield losses to upland and rainfed lowland rice ... -
The quadratic variation of continuous time stochastic processes in vector lattices
(Elsevier, 2017)We define and study order continuity, topological continuity, γ-Hölder-continuity and Kolmogorov–Čentsov-continuity of continuous-time stochastic processes in vector lattices and show that every such kind of continuous ... -
Quadratic variation of martingales in Riesz spaces
(Elsevier, 2014)We derive quadratic variation inequalities for discrete-time martingales, sub- and supermartingales in the measure-free setting of Riesz spaces. Our main result is a Riesz space analogue of Austinʼs sample function theorem, ... -
Qualitative morphological diversity of Amaranthus species
(Kerala Agricultural University, 2017)Morphological characterization of plant genetic resources generates important information for plant breeders useful for pre-breeding and breeding programmes of crops. Amaranthus is one of the underutilized and genetically ... -
Qualitative serum organic acid profiles of HIV-infected individuals not on antiretroviral treatment
(Springer, 2012)The first application of gas chromatography mass spectrometry (GC–MS) metabolomics to the analysis of organic acid profiles in sera of asymptomatic human immunodeficiency virus (HIV)-infected individuals (n = 18) ... -
The quality of environmental impact reports for projects with the potential of affecting wetlands in South Africa
(South Africa Water Research Commission, 2008)In South Africa certain development activities, which may have a substantial detrimental effect on the environment, require an environmental impact assessment (EIA), including projects with the potential of affecting ... -
Quantifying the effect of air quality offsets on household air pollution and thermal comfort on the South Africa Highveld
(NACA, 2020)South Africa, like other developing countries, has been facing air quality challenges. As a highly industrialised country, industrial emissions both from power generations and mining activities contribute significantly ... -
Quantifying the woody component of savanna vegetation along a density gradient in the Kalahari Bushveld: a comparison of two adapted point-centered quarter methods
(CSIRO Publishing, 2014)Bush encroachment is a serious problem in savanna rangelands of southern Africa. There is a strong interest in practical and reliable assessment methods to quantify related vegetation changes in the woody layer such as the ... -
A quantitative assessment of cell-free DNA utilizing several housekeeping genes: measurements from four different cell lines
(Springer, 2016)Quantitative real-time PCR (qPCR) is regularly used to quantify cell-free nucleic acids (cfNAs) in order to identify biomarkers for various pathologies. However, studies have shown notable housekeeping gene expression ... -
Quantitative determination of octadecenedioic acid in human skin and transdermal perfusates by gas chromatography-mass spectrometry.
(Oxford Univ Press, 2008)A gas chromatographic (GC) method with mass spectrometric (MS) detection is developed and validated for the accurate and precise determination of octadecenedioic acid (C18:1 DIOIC) in human skin samples and transdermal ... -
Quantitative elucidation of maternal-to-fetal transfer of neonicotinoid pesticide clothianidin and its metabolites in mice
(Elsevier, 2020)Neonicotinoids (NNs), a widely used class of systemic pesticides, are regarded as exhibiting selective toxicity in insects. However, NNs are suspected of exerting adverse effects on mammals as well, including humans. To ... -
Quantitative metabolomics of a xylose-utilizing Saccharomyces cerevisiae strain expressing the Bacteroides thetaiotaomicron xylose isomerase on glucose and xylose
(Springer, 2017)The yeast Saccharomyces cerevisiae cannot utilize xylose, but the introduction of a xylose isomerase that functions well in yeast will help overcome the limitations of the fungal oxido-reductive pathway. In this study, a ... -
A quantitative model to evaluate post-implementation efficiency of Scrum
(IOS Press, 2010)In order to improve the information system development process many companies have adopted system development methodologies. Various evaluation methods and frameworks exist in the literature to assist companies during their ... -
The quantity of dark matter in early-type galaxies and its relation to the environment
(Oxford Univ Press, 2019)We study the behaviour of the dynamical and stellar mass inside the effective radius of early-type galaxies (ETGs) as a function of environment considering Newtonian dynamics, different surface-brightness profiles, different ... -
Quartz exposure in agriculture: literature review and South African survey
(Oxford Univ Press, 2010)Objectives: To review the published literature on respirable quartz exposure and associated disease in agricultural related settings systematically and to describe personal respirable dust and quartz measurements collected ... -
Quasi-metric trees and q-hyperconvex hulls
(Scientific and Technological Research Council of Turkey, 2017)The investigation of metric trees began with J. Tits in 1977. Recently we studied a more general notion of quasi-metric tree. In the current article we prove, among other facts, that the q-hyperconvex hull of a q-hyperconvex ...
