Browsing Natural and Agricultural Sciences by Title
Now showing items 2644-2663 of 2707
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Vaalharts : environmental aspects of agricultural land and water use practices
(North-West University, 2018)The world population is rapidly growing and this population growth is placing tremendous strain on food security. Therefore, more food has to be produced to meet the demand of the increasing number of people, which leads ... -
Validating the use of p53-cannabidiol co-treatment as endogenous biomarker for treatment of cervical cancer
(North-West University (South Africa), 2019)Cervical cancer remains the most diagnosed gynaecological malignancy in women worldwide. The lack of resources and high HIV/AIDS incidences occurring in Sub-Saharan Africa are assumed to be some of the contributing factors ... -
Validation of artificial mussels as indicators of platinum group element exposure in the Hex River System
(North-West University (South Africa). Potchefstroom Campus, 2019)Platinum group elements (PGE) occur naturally in the environment in very low concentrations. However, these elements have increased over the last couple of decades, since they have been increasingly used in a number of ... -
Valuation of ecosystem services at health clinic gardens in South Africa
(North-West University (South Africa). Potchefstroom Campus, 2019-05)Health clinic gardens provide a variety of ecosystem services (ESs) that when properly valued may inform the larger community of the benefits of having a garden, especially concerning food and health security and increase ... -
Valuation of initial margin and model risk
(North-West University (South Africa), 2020)The research work of the thesis focuses on two themes: the valuation of initial margin and model risk quantification. The first theme addresses matters arising from the valuation of initial margin for over-the-counter ... -
The value of certain morphological features in the age determination of the small mouth yellow fish Barbus Holubi [Steindachner, 1894]
(North-West University (South Africa), 1972)The oldest fossil records of fish in South Africa come from the Witteberg Series in the Cape Province (Fig. 1) , These fish lived in the Palaeozoic Era about 250 million years ago and had ganoid scales. They could have ... -
The value of independent Environmental Control Officers in responsible tourism : a Kruger National Park perspective
(North-West University (South Africa), 2021)Sustainable development has been realised as a way of practicing sustainability in protecting the environment, economy and the society from negative impacts. In order to curb damage to the natural environment, regulatory ... -
Variability in water masers and possible accretion burst in NGC 2071-IR
(North-West University (South Africa), 2023)Although stars are ubiquitous in the Universe, the processes leading to their formation are still poorly understood. Developing a unified theory of star formation is hindered by the fact that stars in the different mass ... -
Variability of Aloin in Cape aloes
(North-West University (South Africa), 1964)"Abstract not copied" -
Variability of methanol and OH masers associated with the star forming region G339.62-0.12
(North-West University (South Africa), 2020)Astrophysical maser emission from various molecules and in a number of astrophysical environments is now a well-known phenomenon. Since the first discovery of hydroxyl (OH) maser emission by Weinreb et al. (1963), the use ... -
Variable selection in logistic regression using exact optimisation approaches
(North-West University (South Africa), 2020)Logistic regression modelling has been and still remains one of the most frequently used methods for the solving of binary classifcation problems, where the target variable of interest can take on one of two values. Futher ... -
Variasie in die Schistosoma haematobium-ovagetalle wat deur mense onder verskillende toestande ge-ekskreteer word asook verwante morbiditeitsverskynsels
(North-West University (South Africa), 2003)Several methods exist for the identification of schistosome infections in humans, of which the most common and accurate is the demonstration of schistosome eggs in the urine. However, several reports have indicated that ... -
Vegetation classification of the proposed Heritage Park, North-West Province, South Africa
(North-West University, 2010)The proposed Heritage Park will link Pilanesberg National Park and Madikwe Game Reserve with a corridor of approximately 170 000 ha, to form a conservation area of roughly 250 000 ha. This proposed Heritage Park will ... -
Vegetation dynamics of urban open spaces subjected to different anthropogenic influences
(North-West University, 2004)Urbanisation contributes to the degradation of urban biospheres, and the degeneration of the quality of life for future generations, In the North West Province the urbanisation rate is expected to rise dramatically due ... -
Vegetation establishment and functionality on kimberlite tailings in the afro-alpine zone of Lesotho
(North-West University (South Africa), 2017)Mining activities can have severe negative impacts on the natural environment. It is therefore important for mines to develop and implement mitigation measures through a rehabilitation strategy. As such, Letšeng Diamond ... -
A vegetation study on the area leased for mining purposes by Impala Platinum, Rustenburg South Africa
(North-West University, 2010)Conservation and management of the ecology of natural areas has become a prerequisite for mining companies in South Africa. Systematic conservation planning provides a useful tool for land–use planning and impact assessment, ... -
Vehicular Ad-hoc Network based Anti-theft Model for car theft prevention in South Africa
(North-West University (South Africa), 2019)Vehicle security is an area of major concern as indicated by the rate at which vehicles are stolen in South Africa. This is evident from the statistics found on reputable government sites and from the frequency at which ... -
Vektorintegrasie met toepassings op stogastiese prosesse in Riesz ruimtes
(North-West University (South Africa), Potchefstroom Campus, 2016)Daar is al 'n verskeidenheid van teorieë ontwikkel om die abstrakte Lebesgue integraal te veralgemeen vir funksies of mate wat vektorwaardig is. Ons bestudeer drie van die mees suksesvolle integrasie teorieë, die van ... -
Veranderinge van die plasmaproteïene, proteïengebonde-jodium en die lipogram tydens eksperimentele aterosklerose
(North-West University (South Africa), 1968)The object of this study was to determine what changes the plasma proteins and thyroid function exhibit during experimental generation of atherosclerosis in experimental animals and how this corresponded with the measurable ... -
Die verband tussen fisieke aktiwiteit, middelomtrek en die gebruik van chroniese medikasie onder Suid–Afrikaanse mans
(North-West University, 2012)The human body best performs when it is physically active. The consequences of inactivity can bring about many health risks. The purpose of this study was to investigate the relationship between physical activity, waist ...