Abstract Natural organic matter (NOM) is a generic term for a mixture of organic, slightly watersoluble components found in soil, sediment and natural waters, which represents severe challenges for the process control in water treatment plants as well as water distribution systems. The effective removal of NOM during drinking water treatment requires a good understanding of its character. The current study aimed to identify and quantify NOM present in the Windhoek Goreangab Operating Company...
ABSTRACT Small mammals host diverse communities of both ectoparasites (e.g. fleas and ticks) and endoparasites (e.g. bacteria and viruses). Some parasites are vectors of diseases that infect both humans and wildlife. The main objective of the study was to discover and molecularly characterize novel Hantaviruses and Arenaviruses and to determine the prevalence and intensity of fleas on small mammals in selected areas of Namibia. Small mammals were trapped from six different regions and screen...
ABSTRACT Diospyros lycioides and Euclea divinorum commonly known as muswiti and mutakula respectively in Zambezi region are indigenous to Namibia and belong to the family Ebenaceae. The twigs and roots from these plants are commonly used as chewing sticks in Namibia. If properly used, the chewing sticks have proven to be effective in removing dental plaque due to mechanical cleaning and enhanced salivation. Chewing sticks from other plants have been shown to display antimicrobial activities ...
ABSTRACT Studies on laboratory colonies of Bulinus globosus from forest savannah and transition zones
ABSTRACT The amide alkaloids, steriods and lactones- like constituents
ABSTRACT Tephrosia lupinifolia is used traditionally for the treatment of malaria, diarrhea, toothache and tuberculosis. Two flavonoids, lupinifolin and lupinifolinol were previously isolated from the hexane root extract of T. lupinifolia, but there are no reports on phytochemical and pharmacological studies conducted on the stems and leaves of the plant. The purpose of this study was to prepare and fractionate crude extracts from the leaves and stems of T. lupinifolia, and to evaluate their ...
ABSTRACT Silica sand is a main component in the synthesis of potassium silicates that are commonly used as binding, coating, and adhesives agents. Physical and chemical properties of the sand particles such as grain size, mineralogical and geochemical compositions, determine the viability of sand in the synthesis of potassium silicates. This study analysed sand samples from dunes in the Namib and Kalahari deserts in order to 1) evaluate their suitability in potassium silicate synthesis as wel...
ABSTRACT The primary target for atherosclerosis associated cardiovascular (AACV) risk prediction and treatment assessment is the lipid profile fraction of low-density lipoprotein cholesterol (LDLC). The routinely used Friedewald method for LDLC estimation has an unacceptably high analytical error. In this study, patient sera LDLC was estimated using the Friedewald method (LLC) and the Roche Diagnostics direct homogeneous method (dLDLC). Serum lipid calculations of non-HDLC, HDLC/LDLC ratios,...
Abstract Over the past few decades metals in medicine have played to play a significant role, especially after the discovery of the anticancer properties of cisplatin. However, acquired and intrinsic resistance, toxicity and a host of side-effects have encouraged the research for new metal based anticancer agents. Organometallic complexes have proved to be successful anticancer agents and several have commenced clinical trials. The aim of this study was to prepare and characterize trinuclear ...
ABSTRACT Plant species in the genus Helichrysum, are widely used in Southern African traditional medicine. Antibacterial and antifungal activities were reported for most of the Helichrysum species including H. argyrosphaerum. As a starting point to elucidate the structures of the compounds that may be responsible for these properties, phytochemical screening was performed to qualitatively identify the classes of compounds present. The results showed that the plant is rich in polyphenols and ...
ABSTRACT In 1991, Michael Grätzel and co-workers developed a new photovoltaic cell known as Dye Sensitized solar cells (DSSCs); these photovoltaic semiconductor devices convert solar radiation directly into electricity [1]. Metal-free sensitizers such as organic dyes and natural dyes have received attention as alternative DSSC applications and have been extensively developed [2]. Two metal free dyes were reported. These dyes were prepared through Schiff base synthetic methods, which a...
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ABSTRACT Five different filling stations (Station A, Station B, Station C, Station D and Station E) were analyzed for Total Petroleum Hydrocarbons and heavy metals concentration using Gas chromatography–mass spectrometry and atomic absorption spectrophotometer respectively. The result of the analysis obtained indicated that the percentage range of Total Petroleum Hydrocarbons (TPH) in soil is from 0.8061-34.3103%, respectively. Furthermore, the percentage range of underground water are from...
ABSTRACT A large number of hetero-aromatic and carbonyl molecules are useful in pharmaceutical and dye industries. Studies of their transition dipole moment (Δμ) and transition polarizability (Δα) are important because they determine their solubility and usefulness. Experimental determination of these parameters and other electronic properties such as oscillator strength (f) using Solvatochromic Shift Equations (SSE) has proved to be unreliable. This is due to the large spread in their re...