Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 3896-3915 of 4825
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S-nitrosylation and attenuation of excessive calcium flux by pentacycloundecane derivatives
(Bentham Science, 2012)A novel series of polycyclic amines, containing nitrogen monoxide donating moieties, were synthesised and tested for calcium channel and N-methyl-D-aspartate receptor modulating activity. The synthesised compounds were ... -
Safety and efficacy of inactivated African horse sickness (AHS) vaccine formulated with different adjuvants
(Elsevier, 2020)African horse sickness virus (AHSV) is a virus species in the genus Orbivirus of the family Reoviridae causing African Horse Sickness (AHS) in equids with a mortality of about 95% in naïve horses. AHS causes serious losses ... -
Salient store image attributes in consumer store selection decisions and the relationship with store satisfaction and loyalty
(Journal of contemporary management//Sabinet [minevent@global.co.za], 2010)The study examines salient image attributes in consumer store selection and subsequently tests the relationship with store satisfaction and store loyalty. A structured questionnaire containing 32 variables relating to store ... -
SALT spectropolarimetry and self-consistent SED and polarization modeling of blazars
(MDPI, 2017)We report on recent results froma target-of-opportunity program to obtain spectropolarimetry observations with the Southern African Large Telescope (SALT) on flaring gamma-ray blazars. SALT spectropolarimetry and contemporaneous ... -
Sampling variation in the quantification of fumonisins in maize samples
(Scientific Publishing (NISC), 2011)Fumonisins produced by F. verticillioides and F. proliferatum cause mycotoxicoses in horses, swine and rats and have been associated with oesophageal cancer in humans. Accurate measurement of mycotoxins is essential for ... -
SAUCGA: the potential, role, and development of underground coal gasification in South Africa
(SAIMM, 2018)This paper offers an introduction to and strategic context for the other papers included in this special UCG edition of the Journal of the Southern African Institute of Mining and Metallurgy. South Africa is facing long-term ... -
Scalable hydrogen production from a mono-circular filter press Divergent Electrode-Flow-Through alkaline electrolysis stack
(Elsevier, 2018)By incorporating all positive design criteria developed to date, to improve on performance and gas purities, a scalable and simplistic Mono-Circular Filter Press (MCFP) reactor has been developed and tested for the Divergent ... -
Scaling of relativistic shear flows with the bulk Lorentz factor
(IOP Publishing, 2018)We compare Particle-in-cell simulation results of relativistic electron–ion shear flows with different bulk Lorentz factors, and discuss their implications for spine-sheath models of blazar versus gamma-ray burst (GRB) ... -
Scanning electron microscopic (SEM) study of selected Tenuipalpidae (Acari: Prostigmata; Pentamerismus, Aegyptobia) from Turkey
(Entomological Society of Turkey, 2011)False spider mites (Acari: Tenuipalpidae) are flattened and red in color. They are distributed worldwide and considered as cosmopolitan pests. Some of the species are host specific, found on greenhouse plants as well as ... -
Scattering of electron holes in the context of ion-acoustic regime
(AIP, 2019)Mutual collisions between ion-acoustic solitary waves are studied based on a fully kinetic simulation approach. Two cases, small and large relative velocities, are studied, and the effect of trapped electron population ... -
Scenarios of good Anthropocenes in southern Africa
(Elsevier, 2020)In the rapidly changing and uncertain world of the Anthropocene, positive visions of the future could play a crucial role in catalysing deep social-ecological transformations to help guide humanity towards more sustainable ... -
Schizoglossum austromontanum, a novel new species from South Africa (Apocynaceae, Asclepiadoideae, Asclepiadeae)
(Magnolia Press, 2016)A new species from southern Africa namely Schizoglossum austromontanum is described. Line-drawings, scans of the type material, images and a conservation assessment are provided -
Science with e-ASTROGAM: a space mission for MeV-GeV gamma-ray astrophysics
(Elsevier, 2018)e-ASTROGAM (‘enhanced ASTROGAM’) is a breakthrough Observatory space mission, with a detector composed by a Silicon tracker, a calorimeter, and an anticoincidence system, dedicated to the study of the non-thermal Universe ... -
Score tests for covariate effects in conditional copulas
(Elsevier, 2017)We consider copula modeling of the dependence between two or more random variables in the presence of a multivariate covariate. The dependence parameter of the conditional copula possibly depends on the value of the covariate ... -
Screening of environmental friendly ionic liquid as a solvent for the different types of separations problem: Insight from activity coefficients at infinite dilution measurement using (gas + liquid) chromatography technique
(Elsevier, 2016)The present work focussed on screening of the environmental friendly imidazolium-based ionic liquid for the separations of (alkane/aromatic), (alkane/alk-1-ene), (cycloalkane/aromatic) and (water/alkan-1-ol) using (gas + ... -
Search for a dark matter annihilation signal from the galactic center halo with H.E.S.S.
(APS, 2011)A search for a very-high-energy (VHE; ≥100 GeV) γ-ray signal from self-annihilating particle dark matter (DM) is performed towards a region of projected distance r∼45–150 pc from the Galactic center. The background-subtracted ... -
A search for a dark matter annihilation signal toward the Canis Major overdensity with H.E.S.S.
(EDP Sciences, 2009)A search for a dark matter (DM) annihilation signal into γ -rays toward the direction of the Canis Major (CMa) overdensity is presented. The nature of CMa is still controversial and one scenario represents it as a dwarf ... -
Search for dark matter annihilation signals from the fornax galaxy cluster with HESS
(IOP Publishing, 2012)The Fornax galaxy cluster was observed with the High Energy Stereoscopic System for a total live time of 14.5 hr, searching for very high energy (VHE; E > 100GeV) γ -rays from dark matter (DM) annihilation. No significant ... -
Search for dark matter annihilation signatures in H.E.S.S. observations of dwarf spheroidal galaxies
(APS, 2014)Dwarf spheroidal galaxies of the Local Group are close satellites of the Milky Way characterized by a large mass-to-light ratio and are not expected to be the site of nonthermal high-energy gamma-ray emission or intense ... -
Search for dark matter annihilations towards the inner Galactic halo from 10 years of observations with H.E.S.S.
(APS, 2016)The inner region of the Milky Way halo harbors a large amount of dark matter (DM). Given its proximity, it is one of the most promising targets to look for DM. We report on a search for the annihilations of DM particles ...
