Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 138-157 of 4825
-
After-conference report: SACLA ’17. Letter to the editor
(South African Institute of Computer Scientists and Information Technologists, 2017) -
Afterlive: a performant code for Vlasov-Hybrid simulations
(Elsevier, 2018)A parallelized implementation of the Vlasov-Hybrid method Nunn (1993) is presented. This method is a hybrid between a gridded Eulerian description and Lagrangian meta-particles. Unlike the Particle-in-Cell method Dawson ... -
Age, growth rate and size at sexual maturity of Labeobarbus aeneus (Teleostei: Cyprinidae) in the middle Vaal River, South Africa
(Taylor & Francis, 2012)Age structure, growth and size at sexual maturity of smallmouth yellowfish, Labeobarbus aeneus (Burchell), were assessed in 2008–2009. Despite its angling and food importance, little has been published on many aspects of ... -
Age-dating luminous red galaxies observed with the Southern African Large Telescope
(Oxford Univ Press, 2017)We measure a value for the cosmic expansion of H(z) = 89 ± 23(stat) ± 44(syst) km s−1 Mpc−1 at a redshift of z ≃ 0.47 based on the differential age technique. This technique, also known as cosmic chronometers, uses the age ... -
An agenda for ethics and justice in adaptation to climate change
(Taylor & Francis, 2019)As experts predict that at least some irreversible climate change will occur with potentially disastrous effects on the lives and well-being of vulnerable communities around the world, it is paramount to ensure that these ... -
Agistemus aimogastaensis sp. n. (Acari, Actinedida, Stigmaeidae), a recently discovered predator of eriophyid mites Aceria oleae and Oxycenus maxwelli, in olive orchards in Argentina
(Pensoft Publishers, 2013)A new species, Agistemus aimogastaensis, is described with the aid of optical and Scanning Electron Microscopy. This mite is an important predator of two eriophyid mites (Aceria oleae and Oxycenus maxwelli) in olive ... -
Agistemus collyerae (Acari: Trombidiformes: Stigmaeidae) in South Africa: first record, introduction pathways and a re-description including additional life stages
(Acarologia, 2018)Agistemus collyerae Gonzáles-Rodrigues (Stigmaeidae) is reported for the first time in South Africa on grapevines in the Western Cape Province. We investigate a possible introduction pathway of this mite as a contaminant ... -
AGN neutrino flux estimates for a realistic hybrid model
(Elsevier, 2018)Recent reports of possible correlations between high energy neutrinos observed by IceCube and Active Galactic Nuclei (AGN) activity sparked a burst of publications that attempt to predict the neutrino flux of these sources. ... -
Agricultural practices and their potential role in mycotoxin contamination of maize and groundnut subsistence farming
(ASSAf, 2019)Mycotoxigenic fungi are common pathogens of maize and groundnuts; they produce mycotoxins which reduce the yield and quality of these grain crops. Numerous agricultural practices including crop rotation and storage methods ... -
Agro-ecological options for fall armyworm (Spodoptera frugiperda JE Smith) management: providing low-cost, smallholder friendly solutions to an invasive pest
(Elsevier, 2019)Fall armyworm (FAW), a voracious agricultural pest native to North and South America, was first detected on the African continent in 2016 and has subsequently spread throughout the continent and across Asia. It has been ... -
Agrochemicals in freshwater systems and their potential as endocrine disrupting chemicals: a South African context
(Elsevier, 2021)South Africa is the largest agrochemical user in sub-Saharan Africa, with over 3000 registered pesticide products. Although they reduce crop losses, these chemicals reach non-target aquatic environments via leaching, spray ... -
The aid of optical studies in understanding millisecond pulsar binaries
(Sissa Medialab, 2016)A large number of new “black widow” and “redback” energetic millisecond pulsars with irradiated stellar companions have been discovered through radio and optical searches of unidentified Fermi sources. Synchrotron emission, ... -
An air quality assessment in the industrialised western Bushveld Igneous Complex, South Africa
(ASSAf, 2012)South Africa has the largest industrialised economy in Africa, with significant mining and metallurgical activities. A large fraction of the South African mineral assets is concentrated in the Bushveld Igneous Complex ... -
Air quality indicators from the Environmental Performance Index: potential use and limitations in South Africa
(National Association for Clean Air, South Africa, 2017)In responding to deteriorating air quality, many countries, including South Africa, have implemented national programmes that aim to manage and regulate ambient air quality, and the emissions of air pollutants. One aspect ... -
Alain Dubois’ contributions to African amphibian nomenclature
(ISSCA, 2018)Alain Dubois has made important contributions to our understanding of African amphibians. His 1981 interpretations based only on earlier literature include the recognition of a series of subfamiles in the Ranidae. Later ... -
Alcohol consumption and cardiovascular disease risk in an African population in transition: the prospective urban and rural epidemiology (PURE) study
(Medpharm Publications, 2010)Objective: There is evidence showing a cardioprotective effect of light to moderate alcohol consumption in many populations. Whether alcohol consumption reduces cardiovascular disease (CVD) risk in an African population ... -
Alcohol metabolism and health hazards associated with alcohol abuse in a South African context: a review
(Medpharm Publications, 2010)The World Health Organization recently stated that alcohol consumption is the fifth leading cause of death worldwide and that intakes are increasing, especially in developing countries. Alcohol-related effects are major ... -
ALG6-CDG in South Africa: genotype-phenotype description of five novel patients
(Springer, 2012)ALG6-CDG (formerly named CDG-Ic) (phenotype OMIM 603147, genotype OMIM 604566), is caused by defective endoplasmic reticulum a-1,3-glucosyltransferase (E.C 2.4.1.267) in the N-glycan assembly pathway (Gr€unewald et al. ... -
ALG6-CDG: a recognizable phenotype with epilepsy, proximal muscle weakness, ataxia and behavioral and limb anomalies
(Springer, 2016)Introduction Alpha-1,3-glucosyltransferase congenital disorder of glycosylation (ALG6-CDG) is a congenital disorder of glycosylation. The original patients were described with hypotonia, developmental disability, epilepsy, ... -
Alien freshwater fish parasites from South Africa: diversity, distribution, status and the way forward
(Elsevier, 2017)The global translocation and introduction of freshwater fish into non-native regions has created the perfect opportunity for the co-introduction of their parasites. In a recent review on non-native freshwater fish introductions ...