Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 340-359 of 4825
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The association between anthropometric measures and physical performance in black adults of the North West Province, South Africa
(Wiley, 2020)OBJECTIVE: This study investigated associations between anthropometric measures and physical performance in black South African adults. It was hypothesized that noninvasive, simple anthropometric measurements, such as ... -
Association between host genetics of sheep and the rumen microbial composition
(Kluwer Academic Publishers, 2022)A synergy between the rumen microbiota and the host genetics has created a symbiotic relationship, beneficial to the host’s health. In this study, the association between the host genetics and rumen microbiome of Damara ... -
Association between human exposure to heavy metals/metalloid and occurrences of respiratory diseases, lipid peroxidation and DNA damage in Kumasi, Ghana
(Elsevier, 2018)Heavy metals and metalloids contamination in soils, water, food and livers of wild rats have been studied in Kumasi, Ghana and despite the estimated risks to residents, there is no epidemiological study to ascertain these ... -
The association between ownership of common household devices and obesity and diabetes in high, middle and low income countries
(Canadian Medical Association, 2014)Background: Household devices (e.g., television, car, computer) are common in high income countries, and their use has been linked to obesity and type 2 diabetes mellitus. We hypothesized that device ownership is associated ... -
The association between seven-day objectively measured habitual physical activity and 24 h ambulatory blood pressure: the SABPA study
(Springer Nature, 2017)Few studies have examined objective physical activity in relation to 24 h ambulatory blood pressure (BP). We aimed to assess the association of 7-day objectively measured habitual physical activity with ambulatory BP in a ... -
Association of alcohol consumption with specific biomarkers: a cross-sectional study in South Africa
(BioMed Central, 2015)Alcohol consumption plays an important role in the health transition associated with urbanization in developing countries. Thus, reliable tools for assessing alcohol intake levels are necessary. We compared two biological ... -
The association of Tarsonemus mites (Acari: Heterostigmata) with different apple developmental stages and apple core rot diseases
(Taylor & Francis, 2011)Information on the role of mites in the genus Tarsonemus Canestrini and Fanzago, 1876 in the epidemiology of apple core rots (wet and dry) is limited. The aims of this study were to (1) assess the effect of different apple ... -
Association of waist circumference with perception of own health in urban African males and females: the Sympathetic Activity and Ambulatory Blood Pressure in Africans (SABPA) study
(Health & Medical Publishing Group (JEMDSA), 2012)Background: Current waist circumference (WC) cut-points of the Joint Statement Consensus (JSC) (male ≥ 94 cm, female ≥ 80 cm) were compared with a recently proposed WC cut-point (RPWC) (male ≥ 90 cm, female ≥ 98 cm). In ... -
Associations between DDT and egg parameters of the House Sparrow Passer domesticus from the Thohoyandou area of South Africa
(Elsevier, 2018)This study investigated whether the pesticide DDT (Dichlorodiphenyltrichloroethane) and its metabolites, DDE (Dichlorodiphenyldichloroethylene) and DDD (Dichlorobischlorophenylethane) were associated with adverse effects ... -
Associations between dietary salt, potassium and blood pressure in South African adults: WHO SAGE Wave 2 Salt & Tobacco
(Elsevier, 2017)Background & aims In June 2016, South Africa implemented legislation mandating maximum sodium levels in a range of processed foods with a goal of reducing population salt intake and disease burden from hypertension. Our ... -
Associations between reactive oxygen species, blood pressure and arterial stiffness in black South Africans: the SABPA study
(Springer Nature, 2012)Many mechanisms, including oxidative stress, contribute to hypertension. This study investigated the possible associations between oxidative stress, blood pressure and arterial stiffness in black South Africans. Ambulatory ... -
The ASTRI dual-mirror small-size Cherenkov telescope
(Sissa Medialab, 2018)The ASTRI dual-mirror small-size telescope (ASTRI-Horn) is an imaging atmospheric Cherenkov telescope that was developed by the Italian National Institute of Astrophysics (INAF) within the framework of the Cherenkov Telescope ... -
Asymmetric behaviour and geomagnetic dependencies of zonal winds in the middle latitude upper thermosphere
(Elsevier, 2020)In this study we use the CHAMP wind observations from 2002 to 2004 to investigate features of mid-latitude thermospheric winds at low and high geomagnetic activity levels. The winds are observed between the geomagnetic ... -
Asymptotic analysis of solitons and double layers at the acoustic speed
(Cambridge Univ Press, 2017)In this paper, we consider the asymptotic behaviour of solitons and double layers. By using the Sagdeev pseudopotential formalism, a Taylor series expansion is used to derive the asymptotic behaviour. For solitons and ... -
Asymptotics of the smallest singular value of a class of toeplitz–generated matrices and related finite rank perturbations
(Springer Link, 2013)Square matrices of the form Xn = Tn+fn(T −1 n ) ∗ , where Tn is an n×n invertible banded Toeplitz matrix and fn some positive sequence are considered. The norms of their inverses are described asymptotically as their ... -
Asymptotics, finite-sample comparisons and applications for two-sample tests with functional data
(Elsevier, 2019)We consider two-sample tests for functional data with observations which may be uni- or multi-dimensional. The new methods are formulated as -type criteria based on empirical characteristic functions and are convenient ... -
Atmospheric boundary layer top height in South Africa: measurements with lidar and radiosonde compared to three atmospheric models
(EGU, 2014)Atmospheric lidar measurements were carried out at Elandsfontein measurement station, on the eastern Highveld approximately 150 km east of Johannesburg in South Africa throughout 2010. The height of the planetary ... -
Atmospheric dry and wet deposition of sulphur and nitrogen species and assessment of critical loads of acidic deposition exceedance in South Africa
(ASSAf, 2011)We tested the hypothesis that acidic atmospheric pollution deposition, originating from the South African central industrial area, poses an environmental threat across a larger region within the dispersal footprint. A ... -
Atmospheric ions and nucleation: a review of observations
(EGU, 2011)This review is based on ca. 260 publications, 93 of which included data on the temporal and spatial variation of the concentration of small ions (<1.6 nm in diameter) especially in the lower troposphere, chemical composition, ... -
Atmospheric trace metals measured at a regional background site (Welgegund) in South Africa
(EGU, 2017)Atmospheric trace metals can cause a variety of health-related and environmental problems. Only a few studies on atmospheric trace metal concentrations have been conducted in South Africa. Therefore the aim of this study ...