Abstract Namibia is among the driest countries in the world, and with the current drought that the country is experiencing, there is a greater need to provide drinking water not only to Windhoek, but the greater Nation at large. The Gammams Wastewater Treatment Plant, which is responsible for treating domestic and some industrial wastewater, regularly experiences toxic pluses that result in the inhibition of nitrification in the activated sludge process, leading to poor removal of ammonia. T...
Abstract An understanding of the water used by vegetation in water limited environment is critical to fully understand water relations of natural areas with vegetation. Such information can be integrated in water management plans to estimate the influence of groundwater abstraction on the vegetation. Trees and shrubs are able to access water from: the upper unsaturated soil profile, the capillary zone of a groundwater store, from nearby streams and rivers. Previous studies have proven that u...
ABSTRACT Medicinal plants are rich in a wide variety of bioactive compounds associated with various ailments; including antibacterial activity and some of them have been used worldwide in traditional settings to treat diarrheal diseases. However evidence on safety and efficacy of some of these traditional medicinal plants is lacking, preventing their mainstream use. This study aimed at determining the antibacterial activity of Boscia albitrunca, Ziziphus mucronata, Combretum apiculatum, Sola...
Abstract The Langer Heinrich and Klein Trekkopje U deposits are located within the Namib Desert in Central Namibia. Both deposits are hosted by calcretes developed within palaeo-channel systems of Tertiary age. The sources of both U and V in the two deposits and the reasons why the two deposits differ in terms grade and tonnage have remained unclear to many researchers. The study aimed to resolve these uncertainties. During the study, the geology of the area was reviewed and a number of rese...
ABSTRACT The aim of the study was to assess solid waste recycling as an emerging source of raw material in Namibia. Recycling solid waste has become part of society. In striving to meet the high demand for raw materials and finding solutions to waste management challenges, countries worldwide are turning to recycling of solid waste. In developing countries, recycling is an emerging industry. While there have been numerous studies on recycling processes, very few studies have focused on recyc...
Abstract-The importance of recrystallization kinetics in metal process cannot be over emphasized in providing information as to the control of microstructure of materials for purpose of improving or impacting desired mechanical properties in processed materials. In this study, 0.12wt% C steel cold drawn between 20% - 55% were graduallyheateduptoatemperatureof900°C followed bysoakingtreatment between 600 seconds and 3600 seconds in a Gallenkomp® mufflefurnace model SVL-1009 with voltage regu...
ABSTRACT A number of environmental studies previously conducted in the Tsumeb Mining district analysed total metal concentrations in soils and vegetation; with results showing high concentrations of heavy metals such as arsenic, cadmium, copper, lead and zinc which exceed international guidelines for different land uses. However, the actual concentrations of only potentially harmful species for each element were not ascertained. This study aimed at determining the concentrations of potential...
ABSTRACT ;/ descript ive cross -, section analysis 0/ five hundred patients who were symptomatically diagnosed of malaria in three locations: Saki (peri-urban), Ibadan (urban) and Lagos (highly urbanized) were recruited /01' this study using a well structured questionnaire between September 2005 and June 2006. The prevalence 0/ both malaria and HIV infections were higher in Peri-Urban town than the other two locations. We observed that 80% were HIV positive in Saki. 20% in Ibadan and 37. J % ...
ABSTRACT It is envisaged that population numbers of the species Hoodia gordonii will decline rapidly because of its commercial potential. To ensure that genetic materials are not lost due to lack of information, the research was conducted in order to examine the translocation potential of Hoodia gordonii, by assessing various factors affecting its initial establishment and survival. The study was carried out in the !Khob !Naub conservancy, located in the southern arid region of Namibia. Loca...
ABSTRACT Titanium Oxide (TiO2) as a photocatalyst produces free radicals upon receiving light energy; thus, it possesses antibacterial properties. The antibacterial property of silvernanoparticles-doped TiO2 photocatalysts (Ag-NPs/TiO2) could be further enhanced by visible light illumination, which also widens its practical applications. However, the major limitation of this Ag-NPs/TiO2 composite material is its poor miscibility, which subsequently reduces the antibacterial activities of the...
ABSTRACT Most African foods used in weaning are usually cereal-based gruels fermented by Lactic Acid Bacteria (LAB). The food mainly supplies carbohydrate; excessive intake of which might cause malnutrition in growing children. Minimum dietary requirements of a child could be met through fortification with protein-rich supplements. Soybean is rich in dietary protein but contains some antinutritional factors and raffinose, an oligosaccharide responsible for gas formation, bloating and flatulen...
ABSTRACT of the electrical resistivity technique, which red to the seismic technique in fault seal . .. ., ....... . . . , The Agu Abor fault is a prominent growth fault that provides insights on the processes of clay smearing at the fault zone. The properties of the sheared zone in the Cretaceous Enugu Shale were investigated to evaluate the dimensions of the fault, by the use is a cheaper method when compa study. The methodology used for evaruaang tnese possltmtles Involves tne resistivity...
ABSTRACT In this study, a series of N-pyridin-3-yl substituted [phenylsulphonamido] acetamide has been synthesized. The reaction of phenylsulphonyl chloride with various amino acids in basic medium yielded phenylsulphonamido alkanoic acid which, on chlorination with thionyl chloride, gave acid chloride derivatives of phenylsulphonamido alkanoic acid in situ. The acid chloride derivatives on condensation with 3-aminopyridine gave corresponding acetamide in good to excellent yield. The compoun...
ABSTRACT Mathematical models describing the variations in the plasma glucose and J insulin levels over time in an insulin - dependent diabetic person (IDD patient) were formulated. We showed that these models can correctly describe these variations when we solved them sirnuttaneously by andytical approach rather than the normal numerical approach employed for solving non-linear differential equations. The effect of the various parameters involved in the model were tested and it was shown tha...
ABSTRACT The aqueous methanolic extracts of 20 selected plant parts were screened for in-vitro antimicrobial activity against clinical strains of Staphylococcus aureus, Bacillus subtilis, Klebsiella pneumonia, Salmonella typhi, Escherichia coli, Pseudomonas aeruginosa, Aspergillus niger and Candida albicans at a test concentration of 10mg/ml using the agar well diffusion method and penicillin G, chloramphenicol and Nystatin as controls. The seeds of Parkia biglobosa, Glycine max, Voendzeia s...