Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 213-232 of 4818
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Analysis of the vegetation of the sandstone ridges (IB land type) of the north-eastern parts of the Mapungubwe national Park, Limpopo Province, South Africa
(South African National Parks, 2008)The establishment of the Mapungubwe National Park has been an objective of several conservationists for many years. The ultimate objective is that this park should become a major component of a Transfrontier National ... -
Analysis of women empowerment in South African water boards: a special reference to Historically Disadvantaged Individuals (HDIs) in South Africa
(AJOL, 2014)The aim of the study was to investigate women’s empowerment in water boards of South Africa. The study was carried out in all South African water boards (n=14) using both qualitative and quantitative methodologies. A ... -
An analytical hadronic synchrotron mirror model for blazars: application to 3C279
(Sissa Medialab, 2018)On the 28th of January, the High Energy Stereoscopic System (H.E.S.S. the world’s largest ground-based gamma-ray observatory, located in Namibia) detected an orphan TeV gamma-ray flare in 3C279, not accompanied by flaring ... -
Analytical treatment of particle motion in circularly polarized slab-mode wave fields
(Cambridge Univ Press, 2018)Wave–particle interaction is a key process in particle diffusion in collisionless plasmas. We look into the interaction of single plasma waves with individual particles and discuss under which circumstances ... -
Anatomical adaptations of Boerhavia L. and Commicarpus Standl. (Nyctaginaceae) for survival in arid environments of Namibia
(Versita, 2011)Members of the Nyctaginaceae Jussieu. are distributed throughout southern Africa. Eight species of the family occur naturally in arid parts of Namibia. These species have acquired the ability to survive and reproduce in ... -
Anatomy of the Southern African Boerhavia and Commicarpus species (Nyctaginaceae)
(Bangladesh Assosiation of Plant Taxonomists, 2011)The Nyctaginaceae in southern Africa is represented by five genera of which Boerhavia L. and Commicarpus Standl. are the most species-rich. Stem, leaf and anthocarp material was collected in situ and examined with a scanning ... -
The anatomy of γ-ray pulsar light curves
(South African Institute of Physics, 2014)To obtain constraints on the inclination and observer angles, <i>α</i> and <i>ζ</i>, of a <i>γ</i>-ray pulsar from its observed light curve (LC), we make use of geometric models detailing the position and extent of emission ... -
The ancient drug opium
(University of Stellenbosch, 2011)The use of papaver somniferum (from the Latin fero ferre = ‘tobear/bring’ and somnium = ‘sleep’) as a narcotic, goes backto the 13th century BC. The works of ancient authors such asDioscorides, Celsus, Galen, Theophrastus ... -
An animal model mimicking pedunculopontine nucleus cholinergic degeneration in Parkinson's disease
(Springer, 2015)A rostral brainstem structure, the pedunculopontine nucleus (PPN), is severely affected by Parkinson’s disease (PD) pathology and is regarded a promising target for therapeutic deep-brain stimulation (DBS). However, ... -
Anisotropic solutions in modified gravity
(IOP Publishing, 2017)Anisotropic but homogeneous, shear-free cosmological models with imperfect matter sources in f(R) gravity are investigated. The relationship between the anisotropic stresses and the electric part of the Weyl tensor, as ... -
An annotated list and molecular data on larvae of gryporhynchid tapeworms (Cestoda: Cyclophyllidea) from freshwater fishes in Africa
(Springer, 2018)An annotated list of larvae (metacestodes) of gryporhynchid tapeworms (Cestoda: Cyclophyllidea) from freshwater fishes in Africa is provided with numerous new host and geographical records. Newly collected materials from ... -
Annual conferences of the Society
(ORSSA, 2019) -
Annual parallax and galactic orbit of Y Librae (IRAS 15090−0549) Mira variable star-GALORB release
(Oxford Univ Press, 2019)Using the VLBI Exploration of Radio Astrometry (VERA), we measured the trigonometric parallax of an H2O maser source in a variable star of Mira Cet type, Y Lib, to be 0.855 ± 0.050 mas, corresponding to a distance of 1.17 ... -
Anodic destruction of abamectin acaricide solution by BDD-anodic oxidation
(ESg, 2014)This paper presents the study of the electrochemical oxidation of the pesticide Abamectin at a boron-doped diamond (BDD). The effect of using different supporting electrolytes (NaCl, K2SO4, Na2CO3 and Na2SO4) during the ... -
Anodic destruction of abamectin acaricide solution by BDD–anodic oxidation
(ESG, 2014)This paper presents the study of the electrochemical oxidation of the pesticide Abamectin at a boron-doped diamond (BDD). The effect of using different supporting electrolytes (NaCl, K₂SO₄, Na₂CO₃ and Na₂SO₄) ... -
Another look at the Grubbs estimators
(Elsevier, 2012)We consider estimation of the precision of a measuring instrument without the benefit of replicate observations on heterogeneous sampling units. Grubbs (1948) proposed an estimator which involves the use of a second measuring ... -
Ant assemblages at three potential breeding sites for the Brenton blue butterfly, Orachrysops
(The Entomological Society of Southern Africa, 2008) -
Anthelmintic potency of Rumex crispus L. extracts against Caenorhabditis elegans and non-targeted identification of the bioactive compounds
(Elsevier, 2021)Traditional healers and ethnoveterinary therapists use several medicinal plants, such as Rumex crispus L., to treat endoparasite infections. R. crispus has been established by researchers to be effective agasint a few ... -
Anthropogenic and naturally produced brominated phenols in pet blood and pet food in Japan
(ACS, 2017)Present study determined concentrations and residue patterns of bromophenols (BPhs) in whole blood samples of pet cats and pet dogs collected from veterinary hospitals in Japan. BPhs concentrations were higher in cat blood ... -
The anthropogenic contribution to atmospheric black carbon concentrations in southern Africa: a WRF-Chem modeling study
(EGU, 2015)South Africa has one of the largest industrialized economies in Africa. Emissions of air pollutants are particularly high in the Johannesburg-Pretoria metropolitan area, the Mpumalanga Highveld and the Vaal Triangle, ...