Browsing Faculty of Natural and Agricultural Sciences by Title

C2-substituted quinazolinone derivatives exhibit A1 and/or A2A adenosine receptor affinities in the low micromolar range

Pieterse, Lianie; Van der Walt, Mietha M.; Terre'Blanche, Gisella (Elsevier, 2020)

Antagonists of the adenosine receptors (A1 and A2A subtypes) are widely researched as potential drug candidates for their role in Parkinson’s disease-related cognitive deficits (A1 subtype), motor dysfunction (A2A subtype) ...

C679X loss-of-function PCSK9 variant lowers fasting glucose levels in a black South African population: a longitudinal study

Chikowore, Tinashe; Cockeran, Marike; Conradie, Karin R.; Van Zyl, Tertia (Elsevier, 2018)

Aims To determine the longitudinal association of the loss-of-function (LOF) PCSK9 variants (C679X and A443T), proxies of PCSK9 inhibitor drugs, with LDL-C, fasting glucose and glycated hemoglobin. Methods We conducted ...

Calcium : magnesium ratio affects environmental stress sensitivity in the serpentine-endemic Alyssum inflatum (Brassicaceae)

Ghasemi, Rasoul; Rajakaruna, Nishanta; Chavoshi, Zohreh Zare; Boyd, Robert S. (CSIRO Publishing, 2015)

Plants endemic to serpentine soils are adapted to harsh environmental conditions typical of those soils, particularly, low (<1) calcium (Ca) : magnesium (Mg) ratios. We compared survival of two perennial Alyssum species ...

Calibration and validation of optical chlorophyll-measuring devices for use in predicting crude protein concentration in tropical grass herbage

Hughes, M.P.; Lallo, C.H.O.; Mlambo, V.; Jennings, P.G.A. (Wiley, 2016)

The objective of this experiment was to evaluate the Fieldscout CM 1000 NDVI and Yara N-Tester as easy-to-use and cost-effective tools for predicting foliar chlorophylls (a, b and total) and crude protein (CP) concentrations ...

A calibration neutron monitor: energy response and instrumental temperature sensitivity

Krüger, H.; Moraal, H.; Bieber, J.W.; Clem, J.M.; Evenson, P.A. (American Geophysical Union, 2008)

Neutron monitors are integral detectors of secondary cosmic rays. Since each of them has its own detection efficiency, energy spectra cannot readily be derived from their observations. To circumvent this problem, latitudinal ...

A calibration neutron monitor: statistical accuracy and environmental sensitivity

Krüger, Helena; Moraal, Harm (Elsevier, 2010)

This paper is a follow-on of that of Krüger et al. [Krüger, H., Moraal, H., Bieber, J.W., Clem, J.M., Evenson, P.A., Pyle, K.R., Duldig, M.L., Humble, J.E. A calibration neutron monitor: energy response and instrumental ...

Calibration of statistical methods used to constrain pulsar geometries via multiband light curve modelling

Bezuidenhout, M.C.; Venter, C.; Seyffert, A.S.; Harding, A.K. (SAIP, 2016)

Since its launch in 2008, the Fermi Large Area Telescope (LAT) has detected over 200 γ-ray pulsars above 100 MeV. This population of pulsars is characterised by a rich diversity of light curve morphologies. Researchers ...

A call for global action for rare diseases in Africa

Baynam, Gareth S.; Van der Westhuizen, Francois H.; Vorster, Barend C.; Groft, Stephen; Gassman, Safiyya D. (Springer Nature, 2020)

The 11th International Conference on Rare Diseases and Orphan Drugs (ICORD), South Africa, included the Africa-Rare initiative launch and facilitated multi-stakeholder engagement in the challenges facing, and opportunities ...

Calorimetric neutrino expectations from bright blazar flares

Kreter, Michael; Böttcher, Markus; Kadler, Matthias; Krauss, Felicia; Buson, Sara (Sissa Medialab, 2019)

Blazar jets are extreme environments, in which relativistic proton interactions with an ultraviolet photon field could give rise to photopion production. High-confidence associations of individual high-energy neutrinos ...

Calvyn en die natuurwetenskappe

Stoker, Pieter Helenius (The Association for Christian Higher Education / Die Vereniging vir Christelike Hoër Onderwys, 2010)

Can a metabolomics-based approach be used as alternative to analyse fatty acid methyl esters from soil microbial communities?

Willers, Clarissa; Jansen van Rensburg, Peet J.; Claassens, Sarina (Elsevier, 2016)

Modern high-throughput approaches such as metabolomics, holds promise for investigating microbial communities. This study evaluated the quantitative and qualitative data generation potential of a metabolomics-based approach ...

Can metabolomics improve tuberculosis diagnostics?

Du Preez, Ilse; Loots, Du Toit (Springer, 2014)

With one third of the global human population suffering from tuberculosis (TB) in 2001, the disease was officially declared a worldwide emergency by the World Health Organization. Since then this disease has grown ...

Can perceptual differences account for enigmatic information security behaviour in an organisation?

Kearney, W.D.; Kruger, H.A. (Elsevier, 2016)

Information security in organisations is often threatened by risky behaviour of users. Despite information security awareness and training programmes, the human aspect of information security remains a critical and ...

Can the presence of curved forms of the diatom Aulacoseira ambigua in the Nile (Egypt) and Vaal (South Africa) Rivers be ascribed to similar water quality conditions?

Janse van Vuuren, S.; Saber, A.; Swanepoel, A.; Cantonati, M. (Taylor & Francis, 2018)

Spiral colonies of the diatom Aulacoseira ambigua were assigned the rank of forma ( Aulacoseira ambigua f. japonica ). This spiral-shaped, colonial, centric diatom has limited geographical distribution ...