Browsing Doctoral Degrees (Microbial, Biochemical and Food Biotechnology) by Issue Date
Now showing items 1-20 of 56
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Utilisation of edible oils and GLA production by Mucor in the presence of acetate
(University of the Free State, 1998-10)English: Surveys launched across South Africa indicate that many frying establishments abuse their frying oils and fats during the frying process, resulting in degradation and concomitant production of potentially ... -
Diseases of Acacia mearnsii in South Africa, with particular reference to ceratocystis wilt
(University of the Free State, 1998-12)English: The Acacia mearnsii industry is a relatively small, though very profitable industry in South Africa. Wood derived from A. mearnsii is currently in greater demand than that of either pine or eucalyptus in South ... -
Molecular taxonomy and mating type genes in Ceratocystis sensu stricto
(University of the Free State, 1999-01)English: Most species of Ceratocystis sensu stricto are virulent pathogens of a wide variety of plants. In the research presented in this thesis, I have developed a rapid and reliable PCR-based RFLP identification method ... -
Determining the canning quality of small seeded white beans (Phaseolus vulgaris L.)
(University of the Free State, 1999-05)English: It is important to the producers, processors and consumers in south Africa to have dry bean cultivars with acceptable canning quality. Therefore, dry bean breeders needs sui table screening methods to evaluate ... -
Factors associated with coniothyrium canker of Eucalyptus in South Africa
(University of the Free State, 1999-05)English: English: In chapter one of this thesis, the literature pertaining to the genus Coniothyrium and its importance in plant pathology, is reviewed. Special attention is given to Coniothyrium species associated with ... -
Utilization of wood-decay fungi for biokraft pulping of softwood
(University of the Free State, 1999-05)English: The forest products industry is one of the most important earners of foreign exchange for South Africa. The major focus of the industry is the production of pulp with an annual capacity of 2,4 million tons. Wood ... -
Biocatalytic resolution of epoxides: epoxide hydrolases as chiral catalysts for the synthesis of enantiomerically pure epoxides and vic diols from α-olefins
(University of the Free State, 1999-06)English: The synthesis of chiral pharmaceuticals in an enantiopure form had become increasingly important in the last few years. This same trend is now found in the synthesis of agrochemicals. Epoxides, due to their high ... -
Mycotoxin contamination of maize in relation to insect infestation, agricultural practices and agroecology in the Republic of Cameroon
(University of the Free State, 1999-09)English: Maize (Zea mays L.), the staple food crop of the majority of the population of Cameroon, is damaged by insects and diseases from the fields to the stores. As a result, the quantity and the quality of harvested ... -
The production of 3-hydroxy fatty acids by the yeast Dipodascopsis uninucleata and its implications
(University of the Free State, 1999-11)English: In 1991, a novel eicosanoid namely 3-hydroxy-5, 8, 11, 14-eicosatetraenoic acid (3-HETE) was uncovered in the yeast Dipodascopsis uninucleata by van Dyk and co-workers. Strikingly, the production of this compound ... -
Evaluation of the growth and survival of probiotic microorganisms in commercial bio-yogurt
(University of the Free State, 2000-11)A review of the literature highlighting the importance of the 'therapeutic minimum' and the survival of the probiotic bacteria in fermented milk bioproducts is given in Chapter 2. Special reference is made to the ... -
Biology of botryosphaeria dothidea and sphaeropsis sapinea as endophytes of eucalypts and pines in South Africa
(University of the Free State, 2001-12)English: Botryosphaeria dothidea and Sphaeropsis sapinea both very important pathogens in the South African forestry context. These fungi are well established in the country and contribute substantially to annual losses ... -
Bioremediation of a bleach plant effluent from the pulp and paper industry
(University of the Free State, 2003-11)English: Bleach plant effluent was characterised by physico-chemical methods. The chemistry of the bleach plant effluent was examined to devise effective treatment methods. Effluent contained trace amounts of nitrogen ... -
The survival of yeasts and probiotics as adjunct starters in cheese
(University of the Free State, 2003-11)A literature review dealing with various aspects of cheesemaking and ripening is given in Chapter 1. With respect to starter cultures, the criteria for strain selection as well as the taxonomy of different starter strains ... -
Development and application of a small-scale canning procedure for the evaluation of small white beans (phaseolus vulgaris)
(University of the Free State, 2004)English: Laboratory canning and evaluation of dry beans are common practices for testing canning quality of cultivars before commercial release to canning industries. Suitable laboratory canning and evaluation procedures ... -
Lipids and ascospore morphology in yeasts
(University of the Free State, 2004-10)Some yeasts produce sexual spores (ascospores) in a variety of shapes and surface ornamentations. These intriguing structures have hitherto been used only in yeast classification. In this study the likely primary function ... -
Yeasts from Lesotho: their classification and possible applications
(University of the Free State, 2004-11)In view of the decline of natural habitats due to urban and industrial development, the need to search for new yeasts is pressing since few natural habitats have been thoroughly investigated for yeast species. Yeasts have ... -
The role of lipids in the flocculation of Saccharomyces cerevisiae
(University of the Free State, 2005-11)English: Although beer production is one of the oldest biotechnologies in the world, a major constraint in brewing remains controlling flocculation. Evidence points towards a possible role of lipids, associated with the ... -
Evaluation of Yarrowia lipolytica as a host for cytochrome P450 monooxygenase expression
(University of the Free State, 2006-06)Biohydroxylation reactions are catalyzed by various types of hydroxylating enzymes (Ayala and Torres, 2004) which include dioxygenases, lipooxygenases as well as CYP450 monooxygenases. These particular hydroxylation reactions ... -
Molecular and physiological aspects of alcohol dehydrogenases in the ethanol metabolism Saccharomyces cerevisiae
(University of the Free State, 2007-05)English: When Saccharomyces cerevisiae is grown on a fermentable carbon source such as glucose, the fermentative alcohol dehydrogenase, ADH I , catalyses the regeneration of NAD+ from NADH and produces ethanol from ... -
Oxylipins in Cryptococcus neoformans and related yeasts
(University of the Free State, 2007-11)English: Literature shows that Cryptococcus neoformans is an important human pathogen responsible for many deaths worldwide. To compound this, treatment of cryptococcal infections has over the years been difficult. This ...