Browsing Faculty of Natural Science by Issue Date
Now showing items 21-40 of 2560
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Investigation of the mechanism of fenfluramine-induced pulmonary phospholipidosis in the rat lung model
(University of the Western Cape, 1993)The aim of this study was to investigate the mechanism of fenfluramine-induced pulmonary phospholipidosis, by comparing the profile and levels of induced phospholipids in the rat and the mode of phospholipase inactivation, ... -
The influence of nicotine exposure on the male reproductive system
(University of the Western Cape, 1993)It is well documented that cigarette smoking and nicotine exposure create widespread physiological disorders in humans and animals. The primary tobacco constituent that is responsible for the toxicological consequences ... -
The effect of diet on the mucus histochemistry and adjacent histology of the digestive tract in Vervet monkeys.
(University of the Western Cape, 1993)There is a need for defined models of human nutritional disorders partly because serious misconceptions about models are common amongst researchers. Historically a large variety of species has been used including primates, ... -
Genetic variation between two subspecies of Reedfrogs in the genus Hyperolius (Anura: Hyperoliidae)
(University of the Western Cape, 1993)The frog genus Hyperolius is the largest of 19 genera in the Hyperoliidae (Channing, 1939). The members of the genus display considerable morphological homogeneity with a diversity of dorsal colour patterns. The genus is ... -
"Genetic variation between two subspecies of reedfrogs in the genus Hyperolius (Anura: Hyperoliidae)"
(University of the Western Cape, 1993)H. m. broadleyi and H. m. verrucosus are not only different in terms of colour pattern, but distinct genetic differences were detected in restriction site maps of their ribosomal DNA. A sequence divergence value of 13,8% ... -
Cross-sectional transmission electron microscopy of nickel silicide formation
(University of the Western Cape, 1993)Silicides play a significant role in modern device technology. The operation of electronic devices heavily relies on the specific properties of metal-semiconductor interfaces. Although semiconductor technology has proven ... -
The relationship between "fertilizaiton environment" and structure and physiology of selected Anuran Spermatozoa
(University of the Western Cape, 1993)The propagation of species and modes of fertilization of higher vertebrates are aspects which have been extensively researched. Studies on the spermatology of lower vertebrates have not received the same attention. Anurans ... -
Effect of simulated acid rain on seed germination and on growth and mineral nutrition of Lycopersicon esculentum var. Red kaki
(University of the Western Cape, 1993)The phenomenon of acid rain is not new. It has been active for more than a billion years (Abelson, 1983). The term "acid rain" was introduced as early as 1872 by Robert Angus Smith, the world's first air pollution control ... -
Evaluation of quantitative motility and zona pellucida binding of human spermatozoa in an assisted reproductive programme
(University of the Western Cape, 1994)Male factor disorders affect more than 30% of infertile couples. Thus, it has become important to perform a andrological consultation and a basic semen evaluation in all male partners of couples consulting for infertility. ... -
The effect of maternal nicotine exposure on the quantity and quality of neonatal rat lung connective tissue
(University of the Western Cape, 1994)The infants of smoking mothers (compared to non-smoking mothers) have been shown to have a lower birth mass, a lower brain mass, an increased perinatal mortality rate as well as a predisposition to respiratory abnormalities ... -
A study of the problems and possibilities of using the marine intertidal zone for teaching principles of ecology in senior secondary schools: A survey of biology teachers in the western cape.
(University of the Western Cape, 1994)In this study I investigate the attitudes of a group biology teachers in the Western Cape, to using the marine intertidal zone for teaching principles of ecology in senior secondary schools, by exploring the problems ... -
Cloning and sequence analysis of the gene coding for a Leuconostoe Bacteriocin
(University of the Western Cape, 1994)Previous studies have shown that Leuconostoc (Lc.) carnosum Tal la produces a bacteriocin that has been designated leucocin B-Tal la [Papathanasopoulos, 1993, M.Sc thesis, University of the Witwatersrandl. Leucocin B-Talla ... -
Variances of purity within torsion-free Abelian groups
(University of the Western Cape, 1994)In 1921, Prufer introduced the concept of a pure subgroup of an abelian group. This concept, which is applicable only to abelian groups, proved to be a very useful one. Subsequently, this concept has sparked off numerous ... -
A study of the pollination biology of the (gyno)dioecious fig, Ficus capreifolia Del. (Moraceae)
(University of the Western Cape, 1994)The pollination biology of Ficus pareidolia Del. was studied. Ficus pareidolia is a (gyno)dioecious species with separate male and female plants bearing male and female syconia respectively. Male syconia had staminate ... -
Genetic variation of rana fuscigula in Southern Africa
(University of the Western Cape, 1994)Naturalists have long been engaged in describing and explaining diversity in the biological world. The discovery of the molecular basis of inheritance has led to rapid increase in the use of biological macromolecules in ... -
In-service female teachers' anxieties about mathematics: a reflective study on mathematics classroom practice at a college of education
(UWC, 1994)The incidence of mathematics anxiety manifesting itself in in-service college students is generally on the increase. Such anxiety does not only affect the mathematical performance of students but also their teaching of the ... -
An assessment of the virulence of listeria spp. isolated from raw milk and raw chicken
(University of the Western Cape, 1994)Listeria a f~rn__e pathogen is the etiological agent of the deadly disease listeriosis. Although, the virulence traits of international isolates of Listeria are well studied, nothing is known about the virulence traits ... -
Epidemiological study of Tuberculosis in Macassar camp
(University of the Western Cape, 1995)The aim of this study was to determine and evaluate the prevalence of TB infection, active TB cases and the risk factors associated with TB infection in Macassar Camp in Macassar (about 40 km from Cape Town on the False ... -
An investigation of the production of non-coated sustained release beads by extrusion and Spheronization
(University of the Western Cape, 1995)The popularity and increasing complexity of sustained release dosage forms has resulted in increased costs to the patient. One approach to achieve cheaper, yet effective, sustained release medication is through the ... -
Science text: Facilitating access to physiology through cognition-based reading intervention
(University of the Western Cape, 1995)Reading and understanding science text is the principal means by which students at tertiary level access scientific information and attain scientific literacy. However, understanding and learning from science texts require ...