Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 1977-1996 of 4822
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Global stability and Hopf bifurcation of a delayed computer virus propagation model with saturation incidence rate and temporary immunity
(World Scientific Publishing, 2016)In this paper, a delayed computer virus propagation model with a saturation incidence rate and a time delay describing temporary immune period is proposed and its dynamical behaviors are studied. The threshold value ?0 is ... -
Global statement on air pollution and health: opportunities for Africa. (Editorial).
(Ubiquity Press, 2019)The human health and economic costs of air pollution in Africa are high and rising. Between 1990 and 2013, deaths from ambient particulate matter on the African continent rose by more than one third, and by 2013 was ... -
Global trends of green pesticide research from 1994 to 2019: a bibliometric analysis
(Journal of Toxicology, 2021)The fast-growing world population places food production under enormous pressure to ensure food security. One of the most common methods to increase food production is the use of pesticides, but the continuous use thereof ... -
A global view of the modulation of cosmic ray protons in the heliosphere for the solar minimum period up to 2009
(IOP Publishing, 2016)The heliosphere was in a state of ideal solar minimum conditions for at least three years up to the end of 2009. During this period the highest ever recorded cosmic ray spectra were observed at the Earth. Fortunately, the ... -
Glow-in-the-dark globular clusters: modelling their multiwavelength lanterns
(South African Institute of Physics, 2012)Globular clusters (GCs) are astronomical tapestries embroidered with an abundance of exotic stellar-type objects, including ancient metal-poor stars, planetary nebulae, white dwarfs (WDs), low-mass X-ray binaries (LMXRBs), ... -
Glycaemic control improves fibrin network characteristics in type 2 diabetes: a purified fibrinogen model
(Thieme, 2008)Diabetic subjects have been shown to have altered fibrin network structures.One proposed mechanism for this is non-enzymatic glycation of fibrinogen due to high blood glucose.We investigated whether glycaemic control would ... -
Glycine conjugation: importance in metabolism, the role of glycine N-acyltransferase, and factors that influence interindividual variation
(Taylor & Francis, 2013)Introduction: Glycine conjugation of mitochondrial acyl-CoAs, catalyzed by glycine N-acyltransferase (GLYAT, E.C. 2.3.1.13), is an important metabolic pathway responsible for maintaining adequate levels of free coenzyme A ... -
A glycomics approach to discover novel renal biomarkers in birds by administration of cisplatin and diclofenac to chickens
(Oxford Univ Press, 2018)Avian species have a unique renal structure and abundant blood flow into the kidneys. Although many birds die due to nephrotoxicity caused by chemicals, there are no early biomarkers for renal lesions. Uric acid level in ... -
Gnathia aureamaculosa, a likely definitive host of Haemogregarina balistapi and potential vector for Haemogregarina bigemina between fishes of the Great Barrier Reef, Australia
(ELSEVIER, 2013)Investigations to determine whether juvenile gnathiid isopods are vectors of haemogregarines between coral reef fishes were undertaken at Lizard Island, Australia. Haemogregarina balistapi parasitaemias in triggerfish, ... -
Gnathia marleyi sp. nov. (Crustacea, Isopoda, Gnathiidae) from the Eastern Caribbean
(Magnolia Press, 2012)A new species of gnathiid was collected in June-August 2008 and 2009 from various sites in the Eastern Caribbean. Third stage pranizae taken from fish hosts were maintained in fresh sea water until their moult into males ... -
Gnathia masca sp. nov. (Crustacea, Isopoda, Gnathiidae) from Lizard Island, Great Barrier Reef, Australia
(Magnolia Press, 2012)Gnathia masca sp. nov. is described from material collected off Coconut Beach, Lizard Island, Great Barrier Reef, Aus-tralia. Males are characterised by a cephalosome with a shallow dorsal sulcus that stretches half its ... -
Goal line technology in soccer: are referees ready for technology in decision making
(LAM Publications; AJOL; Sabinet, 2013)The announcement that goal line technology will be used in the 2014 FIFA World Cup to be hosted by Brazil has sparked renewed interest and debate regarding its accuracy and reliability, its influence on the fluidity and ... -
Gold nanostar colorimetric detection of fructosyl valine as a potential future point of care biosensor candidate for glycated haemoglobin detection
(MDPI, 2019)Diabetes Mellitus is a growing global concern. The current methods used to detect glycated haemoglobin are precise, however, utilise expensive equipment, reagents and consumables. These are luxuries which rural communities ... -
Gomphocarpus glaucophyllus
(SANBI, 2017)The genus Gomphocarpus R.Br. is a relative small genus from the Apocynaceae (sub - family Asclepiadoideae) that is naturally found in mostly arid parts of eastern and southern Africa, extending into the Arabian ... -
Gomphonema grande sp. nov., a new diatom (Bacillariophyta) from the Democratic Republic of the Congo, Tropical Africa
(Magnolia Press, 2016)Gomphonema grande sp. nov. is described from a single sample collected from the Congo River Basin, Tropical Africa. The morphological features of the new species are described and documented through light microscopy and ... -
The good, the bad and the ugly of South African fatal road accidents
(ASSAf, 2018)We reflect on the good, the bad and the ugly of the fatal accidents occurring on South Africa’s roads. The cost of human lives indisputably equates to ‘the ugly’ and the economic cost of accidents associates with ‘the bad’. ... -
The good, the bad and the ugly: using videos to reverse systems analysis and design instruction
(IEEE, 2013)Systems Analysis and Design (SAD) is a second-year subject offered within the Information Technology (IT) course at the Vaal Triangle Campus of the North-West University in South Africa. The diverse environment of this ... -
Goodness-of-fit tests for multivariate stable distributions based on the empirical characteristic function
(Elsevier, 2015)We consider goodness-of-fit testing for multivariate stable distributions. The proposed test statistics exploit a characterizing property of the characteristic function of these distributions and are consistent under ... -
Goodness-of-fit tests for parametric specifications of conditionally heteroscedastic models
(Springer, 2020)We consider a goodness-of-fit test for certain parametrizations of conditionally heteroscedastic time series with unobserved components. Our test is quite general in that it can be employed to validate any given specification ... -
Goodness-of-fit tests for semiparametric and parametric hypotheses based on the probability weighted empirical characteristic function
(Springer, 2016)We investigate the finite-sample properties of certain procedures which employ the novel notion of the probability weighted empirical characteristic function. The procedures considered are: (1) Testing for symmetry in ...