Browsing Natural and Agricultural Sciences by Title
Now showing items 1690-1709 of 2708
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Metaobjects as a programming tool
(North-West University, 2010)Computer applications can be described as largely rigid structures within which an information seeker must navigate in search of information - each screen, each transaction having underlying unique code. The larger the ... -
The metathesis activity and deactivation of heterogeneous metal oxide catalytic systems
(North-West University, 2003)During this investigation it was found that the 8 wt% W03/SiO2 catalyst was effective for the metathetical conversion of 1-octene or 1-heptene to longer chain internal olefins in the detergent range. Various factors were ... -
Metathesis and transalkylation in tandem catalysis
(North-West University, 2007)Longer chain terminal alkenes, which are in high demand in industry, can be obtained from widely available shorter chain terminal alkenes in a tandem catalysis reaction. Tandem catalysis involves me combination of multiple ... -
Metathesis in room temperature ionic liquids : a transformation of seed oil-derived olefins
(North-West University (South Africa), 2012)One of the most important areas of green chemistry is the application of environmentally friendly solvents in catalysis and synthesis. Conventional organic solvents are a threat to the environment due to their volatile, ... -
Metathesis of alkenes using ruthenium carbene complexes
(North-West University, 2005)In this study different ruthenium carbene complexes, Grubbs 1 and 2 were investigated for the reactions of 1-, 2-, 3-octene and 1-tetradecene. All reactions were conducted in glass mini reactors equipped with Mininert® ... -
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Metazoan parasites of anurans from the Vhembe area, Limpopo, South Africa
(North-West University (South Africa), 2022)Amphibians were the first vertebrate group to appear on land about 350 m.y.a and have diversified and colonized all suitable continents and islands. Amphibians are hosts to vast numbers and an astonishing diversity of ... -
Methanol fuel stoves as a clean technology for domestic cooking in South Africa
(North-West University (South Africa), 2021)Methanol is a potential domestic fuel for South African low-income households that could provide a clean and fire-safe alternative to paraffin. Poorly designed paraffin stoves emit harmful substances black carbon fine ... -
A methodology to assess the movement of hydrocarbons in the subsurface and associated remediation thereof
(North-West University, 2018)Petroleum serves as a great source of energy, however, with such principle importance it poses a problem as a global contaminant. Hydrocarbon contamination is a huge threat to groundwater as it contains toxic substances ... -
A methodology to quantify the groundwater impacts of mega-tailings dams for the gold mining industry, South Africa
(North-West University (South Africa), Potchefstroom Campus, 2016)The recovery of base and precious metals (gold, silver, copper, platinum etc.) often entails the removal of a large quantity of rock strata by means of deep shaft and opencast mining practices. The crushing and milling of ... -
A methodology to quantify the risks of urbanisation on groundwater systems in South Africa
(North-West University, 2014)Each year, the urbanised population grows exponentially and due to this growth, cities are forced to expand beyond their manageable borders resulting in greater pressure on the surrounding urban environment. Many South ... -
Micro-pixe study of arbuscular mycorrhiza influence on elemental uptake by Berkheya Coddii
(North-West University (South Africa), 2007)Arbuscular mycorrhiza is a symbiotic association between fungi and plant roots. The major advantage of the symbiosis is an enhanced supply of essential nutrients to plants from the soil. At the same time mycorrhiza can ... -
Microbial and physico-chemical quality of groundwater in the North-West Province, South Africa
(North-West University (South Africa), 2011)More than 80% of the North West Province's (NWP's) rural community solely depend on groundwater for their water needs (Kalule-Sabiti & Heath, 2008). Aquifers are exposed to pollution from anthropogenic activities, yet ... -
Microbial community structure and nematode diversity in soybean-based cropping systems
(2014)Soil is an important ecosystem that supports a wide variety of organisms such as bacteria, fungi, arthropods and nematodes. This sensitive ecosystem may be influenced by various factors, including agricultural management ... -
Microbial consortia dynamics during thermophilic and mesophilic anaerobic digestion of faecal sludge
(North-West University (South Africa), 2022)Globally, water scarcity and sanitation have for a long time been of great concern; therefore, water needs to be preserved, but the demands for safe and adequate water are rapidly increasing. Although sanitation in urban ... -
Microbial diversity and metal pollution from a platinum mine tailings dam in the North-West Province (RSA)
(North-West University, 2008)The aim of this study was to determine the effects of the heavy metal pollution on microbial diversity along the gradient from a platinum mine tailings dam using culture-dependent (plating methods) and molecular methods. ... -
Microbial diversity, community structure and functional characteristics of sunflower rhizospheric soil
(North-West University (South Africa), 2023)Rhizosphere zones are ‘hubs’ for microbial diversity comprising of diverse microbiomes compared with the nearby bulk soils. Rhizospheric microorganisms play major roles in plant health, development and yield. The exploitation ... -
Microbial drinking water quality of selected rural, peri-urban and urban communities and schools in the North West Province, South Africa
(North-West University, 2007)Safe drinking water is a basic human right. This study mainly focused on the physico-chemical and microbiological drinking water quality of selected rural, peri-urban and urban communities and schools in the ... -
Microbial population dynamics during windrow composting of broiler litter
(North-West University, 2012)South Africa produces an average of 154 million broilers (Gallus gallus domesticus) annually, arising to an estimated 886 million kg of broiler litter. The largest population of broilers are reared in the North West province. ... -
Microchaetus modestus [Microchaetidae] en Eisenia rosea [Lumbricidae] en hulle bestaansvereistes met betrekking tot temperatuur en grondvog
(North-West University (South Africa), 1972)"Abstract not copied"