Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 223-242 of 3356
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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 ... -
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 ... -
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 ... -
Attenuation of TeV γ-rays by the starlight photon field of the host galaxy
(Oxford Univ Press, 2017)The absorption of TeV γ-ray photons produced in relativistic jets by surrounding soft photon fields is a long-standing problem of jet physics. In some cases, the most likely emission site close to the central black hole ... -
Attitude of agricultural professionals towards their wards taking agriculture as a career in Kwara State, North Central Nigeria
(South African Society for Agricultural Extension (SASAE), 2016)The paper examines the attitude of agricultural professionals towards their children or people under their care taking agriculture and agricultural extension as a career in Kwara State, Nigeria. A structured questionnaire ... -
Attitude towards materialism in sport and materialism tendecies amongst black generation Y students
(LAM Publications; AJOL; Sabinet, 2011)In today's media-rich world sport celebrities are viewed as potential role models and are often used as marketing vehicles. When they display materialistic tendencies they draw severe criticism as this is believed to be ... -
Attitude towards sport and physical activity, self–esteem, life satisfaction relationship and variations in terms of gender: perspective from university students
(2015)Universities provide a platform for sport and physical activity participation opportunities to students. For students, participation in sport and physical activity is an important part of university life which can lead ... -
Attitudes and perceptions regarding metabolomics research on HIV and AIDS: towards a dynamic model relating basic beliefs, technology and behaviour
(AOSIS, 2014)The human immunodeficiency virus (HIV) and acquired immunodeficiency syndrome (AIDS) pandemic are hitting hard in Africa, not the least in South Africa. In addition to preventative measures, better ways of treatment and ... -
Attitudes towards environmental issues: a case of Bophelong Township
(The Social Sciences Research Society (SOSRES), 2013)This paper examines the attitudes that the households of Bophelong Township have towards environmental issues in their area. Focus was placed on issues pertaining to air pollution and littering in the Township. The study ...
