Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 873-892 of 4825
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The contribution of geography to Environmental Assessment (EA) practice and research in South Africa
(Taylor & Francis, 2016)After 100 years of academic Geography in South Africa, the emerging field of Environmental Assessment (EA) has occupied an important position vis-a-vis Geography. In this paper the contribution of Geography to practice and ... -
The contribution of millisecond pulsars to the Galactic cosmic-ray lepton spectrum
(Elsevier, 2015)Pulsars are believed to be sources of relativistic electrons and positrons. The abundance of detections of γγ-ray millisecond pulsars by Fermi Large Area Telescope coupled with their light curve characteristics that imply ... -
The contribution of physical and chemical sediment characteristics to environmental risk from an irrigation scheme in South Africa
(Springer, 2015)Purpose: The physical and chemical characteristics of sediment from a South African irrigation scheme were used to determine the sediment stressors within the system and to determine whether or not stressors have the ... -
The contribution of the C-824T tyrosine hydroxylase polymorphism to the prevalence of hypertension in a South African cohort: the SABPA study
(Taylor & Francis, 2013)The C-824T single nucleotide polymorphism in the promoter region of the tyrosine hydroxylase gene has been associated with hypertension. It is well documented that African South Africans exhibit a higher prevalence of ... -
A contribution to the conceptualisation of quality in impact assessment
(Elsevier, 2018)Quality is much sought after in, and a basic foundation for, good impact assessment (IA). However, the term is rarely defined, has an uncertain relationship with IA effectiveness, and it means different things to different ... -
A contribution to the knowledge of cheyletid mites of Iran with redescription of Eucheyletia flabellifera (Michael, 1878) (Prostigmata: Cheyletidae)
(Acarologia, 2018)The cheyletid mites collected from Guilan province in Northern Iran were investigated. A total of 16 species were determined. Of these, Eucheyletia flabellifera (Michael, 1878) is a new record for the Iranian cheyletid ... -
Contribution to the knowledge of the oribatid mite family Nesozetidae (Acari, Oribatida)
(Magnolia Press, 2017)A new oribatid mite species of the genus Nesozetes (Oribatida, Nesozetidae) is described from moss (Sphagnum sp.) on the seepage area below a permanent spring in South Africa. Nesozetes membranus sp. nov. differs from its ... -
Contribution towards a metabolite profile of the detoxification of benzoic acid through glycine conjugation: an intervention study
(PLoS, 2016)Benzoic acid is widely used as a preservative in food products and is detoxified in humans through glycine conjugation. Different viewpoints prevail on the physiological significance of the glycine conjugation reaction ... -
Contributions from nearby pulsars to the local cosmic ray electron spectrum
(Elsevier, 2008)PSR J0437-4715 is one of the closest millisecond pulsars (MSPs) to Earth, lying at a distance of _140 pc. This pulsar has a characteristic age of 4.9 Gyr and a relatively low spindown power of _1034 ergs/s. During its ... -
Contributions from nearby pulsars to the local cosmic ray electron spectrum
(Elsevier, 2008)PSR J0437-4715 is one of the closest millisecond pulsars (MSPs) to Earth, lying at a distance of ∼140 pc. This pulsar has a characteristic age of 4.9 Gyr and a relatively low spindown power of ∼1034 ergs/s. During its ... -
Conversation laws for a variable coefficient variant boussinesq system
(Hindawi Publishing Corporation, 2014)We construct the conservation laws for a variable coefficient variant Boussinesq system, which is a third-order system of two partial differential equations. This system does not have a Lagrangian and so we transform it ... -
Convolution algebra for extended Feller convolution
(Springer, 2020)We apply the recently introduced framework of admissible homomorphisms in the form of a convolution algebra of C2-valued admissible homomorphisms to handle two-dimensional uni-directional homogeneous stochastic kernels. ... -
Coordination behaviours of new (bidentate N,O-chelating) Schiff bases towards copper(II) and nickel(II) metal ions: synthesis, characterization, antimicrobial, antioxidant, and DFT studies
(SpringerSpringer, 2017)Two Schiff bases, HL1 and HL2, were synthesized in two different reactions involving 2-hydroxynaphthaldehyde with 2-amino-6-methylbenzothiazole and 2-amino-6-florobenzothiazole respectively. Copper(II) and nickel(II) ... -
Coping facilitated troponin T increases and hypo-responsivity in the copeptin-HPA-axis during acute mental stress in a black cohort: the SABPA study
(Elsevier, 2019)Background Defensive coping (DefS) was associated with a vulnerable cardiovascular profile in blacks. The copeptin/vasopressin system is a manifestation of hypothalamic-pituitary-adrenal-axis activity and may act as an ... -
Copula-graphic estimation with left-truncated and right-censored data
(Taylor & Francis, 2017)In Survival Analysis and related fields of research right-censored and left-truncated data often appear. Usually, it is assumed that the right-censoring variable is independent of the lifetime of ultimate interest. However, ... -
Core bacterial community of soy-daddawa: insights from high-throughput DNA metabarcoding
(Elsevier, 2018)High-throughput sequence analysis of microbial communities in food matrices provides unprecedented insights into species richness and potential safety of foods. Here, the bacterial community of soy-daddawa, a fermented ... -
Corn biomass, uptake and fractionation of soil phosphorus in five soils amended with organic wastes as P fertilizers
(Taylor & Francis, 2020)Sustainable food production includes mitigating environmental pollution and avoiding unnecessary use of non-renewable mineral phosphate resources. Efficient phosphorus (P) utilization from organic wastes is crucial for ... -
Corn yield, phosphorus uptake and soil quality as affected by the application of anaerobically digested dairy manure and composted chicken manure
(Taylor & Francis, 2020)The excessive accumulation of animal manure in livestock production units has made manure a valuable phosphorus (P) source that if used efficiently can be a sustainable alternative to mineral P fertilizer. A two-year field ... -
Correction for a measurement artifact of the Multi-Angle Absorption Photometer (MAAP) at high black carbon mass concentration levels
(EGU, 2013)The Multi-Angle Absorption Photometer (MAAP) is a widely-used instrument for aerosol black carbon (BC) measurements. In this paper, we show correction methods for an artifact found to affect the instrument accuracy in ... -
Correction to the type locality of Tomopterna ahli (Deckert, 1938) (Anura: Pyxicephalidae), with the designation of a neotype
(Magnolia Press, 2019)Deckert described a Tomopterna as Arthroleptella ahli from South Africa in 1938. We demonstrate that the type of Tomopterna ahli (Deckert, 1938) was actually collected in Namibia, and that this nomen is a senior synonym ...