Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 670-689 of 4818
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Clonal expansion of early to mid-life mitochondrial DNA point mutations drives mitochondrial dysfunction during human ageing
(PLoS, 2014)Age-related decline in the integrity of mitochondria is an important contributor to the human ageing process. In a number of ageing stem cell populations, this decline in mitochondrial function is due to clonal expansion ... -
The close pair fraction of BCGs since z = 0.5: major mergers dominate recent BCG stellar mass growth
(Oxford Univ Press, 2017)Using the redMaPPer (red-sequence Matched-filter Probabilistic Percolation) cluster catalogue based on the Sloan Digital Sky Survey (SDSS) photometry, we investigate the importance of major mergers in the stellar mass ... -
Cloud ablation by a relativistic jet and the extended flare in CTA 102 in 2016 and 2017
(IOP, 2017)In late 2016 and early 2017, the flat spectrum radio quasar CTA 102 exhibited a very strong and long-lasting outburst. The event can be described by a roughly two-month long increase of the baseline flux in the monitored energy ... -
Clustering algorithms: sensitivity of mass determination using A 3581
(Wiley-VCH, 2013)In this paper we discuss various methods for clustering in order to determine estimates of the cluster mass, focusing on the cluster A3581. Using virtual observatory (VO) tools, possible galaxy cluster candidates are ... -
CNF-supported platinum electrocatalysts synthesized using plasma-assisted sputtering in pulse conditions for the application in a high-temperature PEM fuel cell
(ESG, 2016)Nanostructured platinum catalysts for a high-temperature proton-exchange membrane (PEM) fuel cell based on polybenzimidazole (PBI) doped by H3PO4 were synthesized by magnetron-ion sputtering of platinum on carbon nano-fibers ... -
Co-composting of cow dung, municipal solid waste, roadside pond sediment and tannery sludge: role of human hair
(Springer, 2017)In general, farmers from developing countries often use several feeding mixtures based on materials available in their vicinity resulting in a final poor-quality compost product. Human hair as a composting feed could impact ... -
Co-introduction of ancyrocephalid monogeneans on their invasive host, the largemouth bass, Micropterus salmoides (Lacepéde, 1802) in South Africa
(Elsevier, 2017)Largemouth bass, Micropterus salmoides (Lacepéde, 1802) were sampled from three provinces (Eastern Cape EC, North West NWP and KwaZulu-Natal KZN) in South Africa to assess for parasite diversity and community composition. ... -
Co-operatives as a development mechanism to support job creation and sustainable waste management in South Africa
(Springer, 2017)South Africa, as with most African countries, is facing the reality of limited economic growth, high levels of poverty and increasing unemployment. At the same time, waste generation is growing, especially in urban centres ... -
Co-sputtered PtxPdyAlz thin film electrocatalysts for the production of hydrogen via SO2(aq) electro-oxidation
(Springer, 2016)A co-sputtered PtxPdyAlz ternary system was investigated for potential use as anode catalyst for the electro-oxidation of aqueous sulphur dioxide (SO2), a key reaction in the hybrid sulphur (HyS) process for splitting water ... -
CO2 reactivity of briquettes derived from discard inertinite-rich Highveld coal using lignosulphonate and resin as binders
(SAIMM, 2019)South African collieries generate approximately 31 Mt of fine and ultrafine coal annually, with the majority of the ultrafine fraction discarded in slurry ponds and underground workings. Use can be made of this energy ... -
Coal-based reducing agents in ferroalloys and silicon production
(Elsevier, 2019)Manganese, chromium, and silicon ferroalloys are typical examples of alloys that are produced using carbon materials to remove oxygen from the raw materials. A majority of such alloys are currently produced in electric ... -
Coal-derived low smoke fuel assessment through coal stove combustion testing
(Elsevier, 2017)A study was undertaken to investigate the production of low smoke fuel from coal currently used in low-income households in South Africa. Pyrolysis of large coal lumps was studied as a possible production method, and an ... -
Coarse-grained molecular dynamics (CG-MD) simulation of the encapsulation of dexamethasone in PSS/PDDA layer-by-layer assembled polyelectrolyte nanocapsules
(Springer, 2020)Experimental studies have reported the fundamental and applied science aspects of polyelectrolyte (PE) layer-by-layer (LbL) self-assembly. LbL nanocoating is a simple and robust technique that can be used to modify the ... -
Cocoa farmers' safety perception and compliance with precautions in the use of pesticides in centre and western Cameroon
(AEER, 2017)Although pesticides are necessary inputs in cocoa production, inability of farmers to comply with safety precautions poses significant threat to their health and sustainable cocoa production in Cameroon. This paper analyzed ... -
Cohort profile: sympathetic activity and ambulatory blood pressure in Africans (SABPA) prospective cohort study
(Oxford Univ Press, 2015)Adapting to an over–demanding stressful urban environment may exhaust the psychophysiological resources to cope with these demands, and lead to sympathetic nervous system dysfunction. The evidence that an urban–dwelling ... -
Collecting and evaluating speech recognition corpora for 11 South African languages
(Springer, 2011)We describe the Lwazi corpus for automatic speech recognition (ASR), a new telephone speech corpus which contains data from the eleven official languages of South Africa. Because of practical constraints, the amount of ... -
Collision properties of overtaking supersolitons with small amplitudes
(AIP, 2018)The collision properties of overtaking small-amplitude supersolitons are investigated for the fluid model of a plasma consisting of cold ions and two-temperature Boltzmann electrons. A reductive perturbation analysis is ... -
Colloidal synthesis of monodispersed ZnS and CdS nanocrystals from novel zinc and cadmium complexes
(Elsevier, 2014)Monodispersed spherical and hexagonal shaped ZnS and CdS nanocrystals respectively, have been synthesized using novel heteroleptic complexes of xanthate (S2CObu) and dithiocarbamate (S2CNMePh). The nanocrystals were prepared ... -
Colloidal-route synthesis of N-butylaniline capped ZnS and CdS nanoparticles
(Elsevier, 2013)A new secondary amine (N-butyl aniline) has been used as surfactant to synthesize monodispersed ZnS and CdS nanoparticles via the colloidal-route. The structural nature and optical properties of the as-synthesized nanoparticles ... -
A combination part of speech tagger using selected voting methods
(IEEE, 2019)The development of resources in any language is an expensive process, many languages, including the indigenous languages of South Africa, can be classified as being resource scarce, or lacking in tagging resources. This ...