Masters Degrees (Faculty of Science (former Departments))
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- ItemAutomatic detection of image orientation using Support Vector Machines(Stellenbosch : Stellenbosch University, 2002-12) Walsh, Dane A.; Omlin, C. W.; Stellenbosch University. Faculty of Science. Dept. of Mathematical Sciences (applied, computer, mathematics).ENGLISH ABSTRACT: In this thesis, we present a technique for the automatic detection of image orientation using Support Vector Machines (SVMs). SVMs are able to handle feature spaces of high dimension and automatically choose the most discriminative features for classification. We investigate the use of various kernels, including heavy tailed RBF kernels. We compare the classification performance of SVMs with the performance of multilayer perceptrons and a Bayesian classifier. Our results show that SVMs out perform both of these methods in the classification of individual images. We also implement an application for the classification of film rolls in a photographic workflow environment with 100% classification accuracy.
- ItemA comparison of the effect of the mechanical wash action on textile fabric deterioration and soil removal efficiency(Stellenbosch : Stellenbosch University, 2001-12) Gericke, Adine; Visser, E.M.; Weideman, E.; Stellenbosch University. Faculty of Economic & Management Sciences. Dept. of Economics.ENGLISH ABSTRACT: Washing and cleansing in an aqueous washing solution is a complex process involving the interaction of numerous physical and chemical processes. Investigations indicate that various factors present during repeated laundering might have an adverse effect on textile fabrics. Little is known, however, about the effect of the different mechanical wash actions on the deterioration of textiles. The automatic washing machines commonly used in South African households are often broadly classified as top loaders and front loaders. On closer inspection, however, it becomes clear that marked differences exist between the horizontal drum machines (H), vertical drum agitator type (V(A)) and vertical drum impeller type machines (V(/)). The effect of laundering on the wear life of textile fabrics has been extensively investigated, but a serious need for research on the effect of the different mechanical washing actions of the different washing machines on textile fabrics exists on both national and international level. A number of factors have an effect on textile deterioration during washing, e.g. number of washes, temperature of wash liquid, detergent type as well as fabric finishes and water quality. Fabric properties like changes in tensile strength, print deterioration and fraying, as well as electron microscope photographs, were used as indicators of mechanical deterioration to textiles. The broad aim of this exploratory study was firstly, to compare the effect of repeated washing in different domestic automatic washing machines (commonly used in South Africa) on the possible mechanical damage to textile fabrics and, secondly, to compare the soil removal efficiency of the mechanical wash actions of the different machines. An experimental study was therefore decided on. The washing of the test fabrics, as well as the testing, was carried out under controlled conditions in a laboratory. Apart from the different mechanical wash actions of the individual machines, the effect of the variables wash temperature, level of detergent and number of washes, was also investigated. This was done by measuring tensile strength, print deterioration and fraying propensity on samples laundered repeatedly at 40°C or 60°C, with and without detergent in the washing liquid, and comparing the colour change measured on laboratory-soiled test fabrics after washing. Analysis of the mechanical wash actions of the seven washing machines compared in this study indicated conspicuous differences among machines. It can be concluded that the mechanical wash action in the category V(A) machines is the most severe, and causes the highest reduction in tensile strength, the greatest print deterioration and the highest degree of fraying. These machines did not, however, exhibit greater soil removal efficiency than the other two categories of washing machines. The machines from category H did not exhibit a significantly different soil removal efficiency than those from category V(A), but their mechanical wash action proved to be less severe. Category V(/) machines seem to have the most delicate wash action and will probably cause the slightest fabric deterioration over the long term, but unfortunately produces poor soil removal efficiency results. This study also confirmed that washing fabrics in water alone causes more deterioration of tensile strength in fabrics than washing with detergent in the wash solution. Due to the limited scope and exploratory nature of this research/study, certain aspects of automatic washing machine processes could not be tested empirically. Recommendations for future research and implications for consumers were formulated.
- ItemThe development of a valid and reliable nutrition knowledge questionnaire and performance-rating scale for urban South African adolescents participating in the 'Birth-to-Twenty' study(Stellenbosch : University of Stellenbosch, 2005-04) Whati, Lindiwe Harriet; Senekal, M.; Steyn, N. P.; Lombard, C. J.; Nel, J. H.; University of Stellenbosch. Faculty of Science. Dept. of Consumer Science.ENGLISH ABSTRACT: The Birth to Twenty (BTT) study involves the monitoring of the health status and related factors of urban-born children from birth until age twenty. When the cohort reached age 13 years in 2003, nutrition knowledge assessment was identified as an important new priority and a nutrition knowledge questionnaire was required for these purposes. Subsequently a valid and reliable nutrition knowledge questionnaire was developed for the BTT study. This process started with the development of a conceptual framework of nutrition-related issues facing urban South African adolescents and identification of related nutrition concepts. A pool of potential questionnaire items reflecting the concepts was subsequently developed. These items were evaluated by an expert panel to ensure content and face validity before being structured into a questionnaire. The resulting 88-item questionnaire was completed by adult and adolescent samples, each age group comprising subgroups of those likely to have good nutrition knowledge and those likely to have poor nutrition knowledge. The data obtained from the completion of the questionnaire by these groups was used to refine the questionnaire through the determination of difficulty and discriminatory indices of the items, and the deletion of items that did not meet the stated criteria. The construct validity of the remaining 63 items was assessed using the same data set. To assess the internal consistency reliability (ICR) of the 63-item questionnaire it was completed by an adolescent sample population considered to be representative of the BTT cohort, after which the questionnaire underwent further steps of refinement. The result was a 60-item questionnaire of which the ICR and construct validity was reassessed and found to be satisfactory. However, to ensure the accurate interpretation of scores obtained by testees, the development of a performance-rating scale was necessary. A norm-referenced performance-rating scale (norms) was developed by administering the nutrition knowledge questionnaire to a sample population similar to the BTT cohort (norm group) and transforming their performance scores to z-scores. The z-scores ranges were then categorised into stanines, thereby resulting in a norm-referenced performance-rating scale that can be used to rate the performance of the BTT cohort. The validity of the norms was assessed by administering the nutrition knowledge questionnaire to three validation groups that comprised groups who were expected to obtain different performance-ratings on the questionnaire based on their varying levels of nutrition knowledge. The validation groups performed as expected, with significant differences in performance-rating profiles found among the three groups, indicating the validity of the norms. The study was successful in developing a reliable and valid nutrition knowledge questionnaire for use on the urban adolescents who participate in the BTT study. A norm-referenced performance-rating scale for use with the questionnaire was also successfully developed. The questionnaire and norms will be useful in assessing nutrition knowledge as well as in comparing the changes in knowledge of the BTT cohort as they move from lower to higher school grades.
- ItemAn exploratory study in the Western Cape on game meat as a consumer product(Stellenbosch : Stellenbosch University, 2002-12) Crafford, Karlien; Hoffman, Louwrens C.; Muller, M.; Schutte, De W.; Stellenbosch University. Faculty of Science.ENGLISH ABSTRACT: The purpose of this research was to study the current purchasing and marketing behaviour of game meat by supermarkets, butcheries and restaurants in the Western Cape Province, and to investigate perceptions on, purchasing and consumption of game meat by South African consumers and overseas tourists visiting South Africa. Research was done by the survey method with the aid of structured, self-administered questionnaires. Chi-squared frequencies were used to test for significant influences of data. The research showed that South African consumers are poorly educated regarding the nutritional benefits and cooking methods of game meat. Consumers indicated that they would buy game meat if they were better informed on its qualities. Just over 73% of the respondents indicated that they have eaten game meat, whilst 66% of the respondents indicated that they would eat game meat again. South African consumers, however, indicated that they are not willing to pay more for game meat than other meat types. Race and educational level were the only two socio-demographical variables that showed significant differences. White respondents and respondents that were in the "post-High school diploma/degree" educational group, were better informed on game meat and were also more likely to buy game meat than either the black or coloured racial groups. The respondents indicated the leanness of meat as one of the most important quality considerations when they buy meat. This provides an opportunity for game meat marketers to market game meat as a low-fat meat product. This research succeeded in identifying target markets for game meat. Restaurants should market game meat for European tourists, whilst supermarkets and butcheries should focus on marketing game meat to white consumers and consumers with higher educational qualifications, but also target coloured and black consumers. This research confirmed that the South African game meat industry is plagued by numerous misconceptions and contradictions. It is evident that both consumers and marketers of game meat have contradictory beliefs regarding the seasonal availability of game meat. Consumers as well as some of the supermarket, butchery and restaurant meat buyers, are ill-informed regarding the sensory qualities, health benefits and preparation and cooking methods of game meat. Ironically, the research showed that tourists visiting South Africa were the respondent group that were the most knowledgeable regarding the sensory qualities and health benefits of game meat. This research provides a valuable pilot-study into the marketing possibilities of game meat.
- ItemFood micro-enterprises for food security in an urban slum community in East London : development of an awareness-creating programme(Stellenbosch : Stellenbosch University, 2001-12) Cress-Williams, Lise; Senekal, M.; O'Neill, D. R.; Vosloo, M. C.; Stellenbosch University. Faculty of Science.ENGLISH ABSTRACT: The aim of the study was to develop the content of a programme to increase the awareness of women in Duncan Village of I) the potential role of food micro-enterprises in the improvement of food security; 2) the consumer demand concerning the operations of food micro-enterprises; and 3) appropriate microenterprise training programmes available in the greater East-London area. This was based on an identified need for the inclusion of a module on food security in a comprehensive programme to prevent growth failure in 0 to 24-month-old children attending local government clinics in Duncan Village by improving the capacity of mothers or primary caregivers to care for their children. Food security is defined as access by all people at all times to enough food for an active, healthy life. The potential role of food micro-enterprises in the improvement of food security was established through a literature review. It was established that street foods contribute to individual food security by providing food where people work or congregate at cheap prices, thus increasing availability. It also helps in meeting energy and nutritional needs if safe, nutritious food is provided. The main method by which it increases an individual's access to food is by supplying an income to food micro-enterprise owners if they sell street foods. The consumer demand concerning the operations (including the products) of food micro-enterprises was determined through personal interviews with the customers and non-customers of food micro-enterprises in Duncan Village, using a structured questionnaire. One hundred and twenty-nine customers and 129 non-customers were selected using a combination of cluster and convenience sampling. Food microenterprises operating at the schools and on pavements in Duncan Village and at the taxi rank in East London were included. The results of this particular survey indicate that the consumer behaviour is influenced by the trade area where the customers purchase their food, the age and gender of the customers as well as the friendliness of the vendor. The product choice of consumers was mostly determined by taste, price and how filling the food is. There was general satisfaction with the operating times of, and the products sold by, food micro-enterprises. Street food consumers were least satisfied with the locations where the enterprises were situated. The dusty environment was given as a reason for dissatisfaction. Further, cleanliness of the food, the vendor and the environment were the main problems cited, especially by the non-customers. The appropriateness of micro-enterprise training programmes available in the greater East London area for current and prospective food micro-enterprise owners in Duncan Village was determined by compiling a profile of food micro-enterprises, their owners and their business operations in Duncan Village; identifying the features of the ideal training programme for current and prospective food microenterprise owners in Duncan Village; investigating the supply of micro-enterprise training in the greater East London area; and evaluating the appropriateness of the identified training programmes. The profile of food micro-enterprises in Duncan Village owned by women, included a profile of the owners, the enterprise itself as well as the business operations thereof. The data were gathered by means ofa personal interview (using a structured questionnaire) with the owners of food micro-enterprises. The enterprises included in the study were operated by women producing and trading processed foods from non-permanent structures at schools and on pavements in Duncan Village, as well as at the taxi ranks in East London. Systematic sampling techniques were used to select food micro-enterprises at the schools while all the enterprises at the pavements and at the taxi rank were included. This resulted in the inclusion of 41 food micro-enterprises. The results indicated that the profiles of these owners do not differ significantly from micro-enterprise owners operating in the informal sector elsewhere in South Africa. Furthermore, they indicated a clear need for training in all aspects regarding their business operations. The identification of the features of the ideal micro-enterprise training programme for the training of current and prospective female food micro-enterprise owners operating in Duncan Village was based on the profiles of street food consumers and food micro-enterprise owners, discussions with experts and on the literature. The identified features were used for the development of a framework to evaluate the appropriateness of micro-enterprise training in the greater East London area for current and prospective food micro-enterprise owners in Duncan Village. The supply of micro-enterprise training in the greater East London area for food micro-enterprise owners was investigated using a structured questionnaire, completed during a personal interview with the training managers of the organisations. All governmental and non-governmental organisations in the area offering training programmes with the objective to motivate and enable persons to establish a microenterprise in the informal sector; or with the objective to enable established micro-enterprises to operate more efficiently within the informal sector, were included in the study population. These organisations were identified through snowball sampling and resulted in ten organisations and 17 programmes being included. Subsequently, the appropriateness of micro-enterprise training programmes available in the greater East London area for current and prospective food micro-enterprise owners in Duncan Village was evaluated using the Evaluation Framework. The results indicate that only one programme, combining business management and cooking skills, could be rated as appropriate for current and prospective food microenterprise owners in Duncan Village. Five other programmes could be rated as moderately appropriate for particular groups. These programmes, with the exception of one, included business management skills and no cooking skills. The remaining programmes were rated as either not very appropriate or inappropriate for current and prospective food micro-enterprise owners in Duncan Village. It is concluded that a need for the mentioned awareness-creating programme exists. Furthermore, it is recommended that the programme developed in this research, be used as basis for the household food security module of the comprehensive programme.
- ItemHousing knowledge of final year student teachers at Esikhawini College of Education : implications for the development of housing unit standards(Stellenbosch : Stellenbosch University, 2003-03) Dlamini, Buyi P.; Van Wyk, A. S.; Stellenbosch University. Faculty of Natural Sciences.ENGLISH ABSTRACT: The provision of housing in South Africa is a national priority. As many aspirant homeowners are first-time homeowners, they are not necessarily informed about the pitfalls of home ownership. Although the Government has attempted short-term solutions aimed at equipping these housing consumers with the necessary knowledge and skills to make informed and responsible housing-related decisions, research pointed to the need for a sustainable longterm solution in the form of education and training of the housing consumer. There must be a concentrated effort to provide housing education to consumers, since everyone has a constitutional right of access to adequate housing. Unless consumers are equipped with adequate knowledge and information to make informed choices, this right will not be realised and the housing market shall not function effectively. The main objective of the research study was to determine the basic housing knowledge of the senior student teachers of the Esikhawini College of Education in KwaZulu Natal. The second objective was to develop an illustrative Unit Standard for teacher qualification programmes on the fifth level of the National Oualificationa Framework (NOF). The sixteen housing education and training core concepts identified by Serfontein (2001 :120) namely Basic Housing Technology, Community, Cultural Aspects of Housing, Environment, Financial Aspects of Housing, Housing Consumerism, Housing Design and Decoration, Housing Market, Housing Needs, Housing Policy, Legal Aspects of Housing, Resource Management, Role-players in Housing, Sources of Housing Information, Tenure Options and Types of Housing were used to compile a questionnaire which was administered to the senior students of Esikhawini College of Education. The aim was to determine the basic knowledge that respondents possessed. The data collected formed the background for the illustrative Unit Standard for Housing Education that was developed in this research study. The development of Unit Standards for Housing Education is very necessary and timely as the Department of Housing, who seeks to develop a systematic housing consumer education framework for South Africa, have recommended that Housing Education should be included in the formal education curriculum. If the recommendations of the Department of Housing are implemented and housing education is included in the school curriculum, well-qualified and trained teachers would be needed to facilitate the learning of the content. Therefore housing education should be included in student teacher training programmes. The illustrative Unit Standard for Housing Education developed in this research study is ideally suited for this purpose.
- ItemHousing preferences of residents in Stellenbosch, South Africa. --- An application of the Hedonic Price Model(Stellenbosch : University of Stellenbosch, 2005-12) Shi, Lin; Van Wyk, A. S.; University of Stellenbosch. Faculty of Science. Dept. of Consumer Science.The issue of housing choice and preferences has been and still is the subject of much academic attention from researchers in many different disciplines. Stellenbosch, the oldest town in South Africa second to Cape Town, is undoubtedly the most scenic and historically well-preserved town in Southern Africa. With this plurality of attractive features, the housing market in Stellenbosch has become one of the most active and expensive housing markets in South Africa. In this specifically booming housing market, it is indispensable to conduct a housing preference and priorities study to determine residents’ tastes and preferences, in order to help those concerned, residents, real estate agents or people related to housing, to make better housing decision. At the same time, considering the affluent housing market in Stellenbosch, sellers and real estate agents are facing the problem of appraising the actual market value of houses. There is an apparent lack of a normative method to evaluate houses, and it is noteworthy that assessments almost always depend on the subjective experience of sellers and real estate agents.
- ItemImpact of a multidimensional weight-management programme on the weight status and associated factors of first-year female students(Stellenbosch : Stellenbosch University, 2004-03) Cilliers, Janetta; Senekal, M.; Kunneke, E.; Stellenbosch University. Faculty of Science.ENGLISH ABSTRACT: First-year female students (FYFS), studying at the University of Stellenbosch were previously identified as a high-risk group for gaining weight. A four-year follow-up of these female students indicated that a large percentage experience weight fluctuations throughout their university careers. The unique weight management needs of the FYFS were also identified in the longitudinal study. The integration of these results with an extensive search and assessment of the weight management literature led to the development of a multidimensional weight-management paradigm for application in the development of weight-management interventions for female students. Subsequently, a self-help weight-management manual, which follows the multidimensional approach proposed in the mentioned paradigm, was developed to address the unique weight-management needs of female students. The aim of the current study was to evaluate the impact of the multidimensional self-help weightmanagement manual (the Manual) on the weight status and associated factors of FYFS at the University of Stellenbosch over an eight-month period. For this purpose a non-randomized quasi-experimental design was used, including purposively selected experimental and control groups. Data were obtained during February (Baseline), May (three months after baseline = Follow-up I) and October 2002 (eight months after baseline = Follow-up 2). All students in the experimental group received the Manual at Baseline for use during the eight-month study period. Because this was a low-intensity intervention programme, no further contact was made with either group during the study period, except when Followup I data were obtained. Measures that were taken and instruments that were completed include the following: weight, height, triceps skinfoid, mid-upper ann circumference, hip circumference, waist circumference, Adolescent Self-Concept Scale (self-concept), Body Shape Questionnaire (body shape concerns), Eating Attitudes Test (eating attitudes and behaviours), General Health Questionnaire (general psychological well-being), 90-item Semi-quantified Food Frequency Questionnaire (dietary intake from nine food groups), and the Baecke Questionnaire of Habitual Physical Activity (physical activity). Additional questions on weight related perceptions and practices, dissatisfaction with body parts, reasons for eating and socio-demographic factors were also included. The Baseline characteristics of the FYFS involved in this study, which did not differ between the experimental and control groups for all key variables, identified them as a typical group of young female adults who are healthy but are not realistic about their weight status and who experience numerous problems related to their weight status. The implementation of the Manual was found to be significantly effective in limiting weight gain among the FYFS in the experimental group. The control group experienced almost a full unit increase in BMI (0.93 kg/m²), while the increase found for experimental group was 0.53 kg/m² (p=0.004). Although the weight of both groups increased initially the experimental group went on to lose weight, while the control group continued to gain weight during the last five months of the intervention. The impact of the Manual is further illustrated by the fact that the FYFS in the experimental group who indicated that they did Lise the Manual extensively experienced a significantly lower rise in their weight (change in BMI over study period = 0.37 kg/m²) than those in the experimental group who indicated that they did not use the Manual (change in BMI over study period = 0.89 kg/m²). Factors that are possibly linked to the success attained with the Manual were identified and include more reasonable weight goals; the use of sound weightreduction methods such as a balanced diet and physical activity; improvements in self-concept; maintenance of physical activity levels, especially during the first three months at university; improvement in general psychological well-being; decreased intake of foods from the "other" (includes mainly high fat, sugar based foods such as doughnuts, cookies, cake, tart), beverage and grains food groups; and possibly less concerns with body shape from the start. Factors for which no link with weight management success could be established include changes in body composition; perceptions of own weight; weight loss attempts; foods from the vegetables, fruit, milk and cheese, meat, fish and chicken, fats and fast foods food groups; physical activity over the total eight-month period; reasons for eating; eating attitudes and behaviour; dissatisfaction with body parts; and body shape concerns. It is recommended that the implementation of the Manual on the campus of the University of Stellenbosch to prevent weight gain of FYFS should be considered, bearing in mind some of the recommendations formulated by the FYFS in the experimental group.
- Item'n Intervensieprogram vir bevordering van inkomstegenerering in 'n landelike gemeenskapsentrum(Stellenbosch : University of Stellenbosch, 2004-12) Langenhoven, Magdalena C. (Magdalena Cornelia); Van der Merwe, M. E.; Botha, M. J.; University of Stellenbosch. Faculty of Science. Dept. of Consumer Science.ENGLISH ABSTRACT: Rural areas in South Africa experience extreme levels of unemployment, and therefore are in dire need for skills training. In some rural areas this training takes place in community centres. Participants are empowered to generate an income. The activities mostly take place in a group context. In such a community centre a lack of the presentation of structured skills training programmes was identified. The aim of the study is to develop a skills training programme to help rural people in starting an income-generating project in a group context by means of intervention. In the literature study the concept of community centres was discussed. The basic human needs and the needs for training were related to the concept of group work. Programme development for adult education, income-generation and interventions were described in detail. The development of creativity, empowerment, capacity building and sustainable development were briefly discussed as potential outcomes of skills training programmes for the generation of income. For the purpose of this study a case study was undertaken of existing needlework groups in the Darling Focus Community Centre. A study group of 15 members was identified. The duration of the study group's involvement in needlework training was determined. The need for skills training workshops and the study group's interest in group work were established. Although the activities of the study group take place in group context, very little evidence exist of co-operation towards the objective of income generation. A major shortcoming is the failure to pinpoint objectives in the group. Darling is a rural tourist attraction with a target market for the sale of handcrafted products. For this purpose the crafted products need to adhere to certain criteria. Despite the opportunity to market products to tourists, only the local market is being targeted. The requirements of these clients are not considered a priority in the manufacturing of products. Therefore the study group was considered a suitable case study in this research. An intervention programme was compiled and implemented in group context for the training of skills in the manufacturing, marketing and selling of products. Surveys were done by self-administered questionnaires and unstructured interviews were conducted with important role players. Workshops were presented where skills application was monitored through control lists. The application of business skills was established through a semi-structured interview. Throughout the process the researcher made observations and documented information. Surveys indicated that the duration of the group members' involvement with needlework activities were between three and eleven years. A clear need for skills training as well as interest in group work was established and addressed. Self diagnoses of needs for skills training was done during visits to trade areas. A brainstorming session was conducted to generate ideas for the manufacturing of products to be sold. The skills in making these products were demonstrated during the workshops and practised during follow-up work sessions. A basic business skill workshop was conducted. After implementation of the intervention the results of the group work were evaluated at the hand of success criteria identified from literature. This list of criteria provides a guideline for similar training programmes.
- ItemMarket and product assessment of probiotics and prebiotics and probiotic strains for commercial use(Stellenbosch : Stellenbosch University, 2004-03) Brink, Marelize; Senekal, M.; Dicks, Leon Milner Theodore; Stellenbosch University. Faculty of Science.ENGLISH ABSTRACT: Probiotics (live microbes) and prebiotics (non-digestible food-ingredients) are rapidly gaining interest worldwide as supplements and functional food ingredients but little South African information in this regard is available. Furthermore, the availability of South African produced probiotic concentrates for commercial use is also very limited. The aims of this study therefore were to complete a market and product assessment of probiotic and prebiotic containing products in South Africa and to evaluate probiotic strains for commercial use in South Africa. For the purposes of market and product assessment probiotic and/or prebiotic containing products manufactured in South Africa were identified. The scientific and legal correctness of health and content claims made on the labels of the products were assessed. An exploratory survey was conducted to determine the awareness of South African consumers of probiotics and prebiotics. For the evaluation of probiotic strains for potential commercial use in South Africa, a panel of twelve lactic acid bacteria (LAB) were screened for inhibitory activity against two porcine pathogens and indicator strains from the LMG-panel isolated from the faeces of patients diagnosed with AIDS. The five LAB with the best inhibitory activity were tested for growth in soymilk-base and for the effect of lyophilization on the inhibitory activity thereof. The effect of prebiotics on the growth and inhibitory activity of the strains was tested in vitro. A range of products containing probiotics and prebiotics available on the South African market was identified. Irregulatories concerning health claims on the labels were found, but content claims seemed to be less of a problem. The results also indicate that the proposed South African regulations for the labelling of probiotic and prebiotic containing products need to be revised to include the probiotic and prebiotic related health claims for which sufficient scientific evidence is available. The probiotic strains with potential for commercial use in South Africa that were identified, include Lactobacillus plantarum 423, Lactobacillus casei LHS, Lactobacillus salivarius 241, Lactobacillus curvatus DF38 and Pediococcus pentosaceus 34. These strains were grown successfully in soymilkbase and lyophilization did not have a negative effective on the inhibitory activity thereof. The growth and inhibitory activity of the five LAB were promoted when combined with 1% (w/v) Raftilose® Synergyl . It is concluded that although a variety of probiotic and prebiotic containing products are available on the South African market, the scientific and legislative correctness of especially health related claims is not satisfactory and that South African consumer awareness of these products is low. It is also concluded that a combination of at least three of the five identified LAB and 1% Raftilose® Synergy can be used by South African manufacturers for the production of probiotic and prebiotic containing supplements.
- ItemMeat quality characteristics of blesbok (Damaliscus dorcas phillipsi) and red hartebeest (Alcelaphus buselaphus caama) meat(Stellenbosch : Stellenbosch University, 2004-03) Smit, Karen; Hoffman, Louwrens C.; Muller, M.; Stellenbosch University. Faculty of Science.ENGLISH ABSTRACT: Please see fulltext for abstract
- ItemMeat quality characteristics of three South African game species : black wildebeest (Connochaetes gnou), blue wildebeest (Connochaetes taurinus) and mountain reedbuck (Redunca fulvorufula)(Stellenbosch : Stellenbosch University, 2004-03) Van Schalkwyk, Sunet; Hoffman, Louwrens C.; Muller, M.; Stellenbosch University. Faculty of Science.ENGLISH ABSTRACT: Please see fulltext for abstract
- ItemMeat quality of raw and processed guinea fowl (Numeda meleagris)(Stellenbosch : Stellenbosch University, 2008-12) Tlhong, Tumelo Maud; Hoffman, Louwrens C.; Vosloo, M. C.; Moelich, E.; Mellett, F.; Stellenbosch University. Faculty of Science. Dept. of Consumer Science.The purpose of this study was to investigate the chemical composition mineral and cholesterol content of the different cuts (breast, drumstick and thigh) of raw guinea fowl meat. The study also aimed at establishing the effect of cooking method on guinea fowl quality attributes by investigating the effect of different cooking methods on the chemical composition and sensory attributes of the different cuts. The effect of injecting a brine solution on the chemical composition and sensory attributes were also investigated. There were no differences in terms of moisture content of the various cuts raw guinea fowl meat The breast had significantly higher protein content when compared to drumstick and thigh (P<0.05). The fat content was similar for all the cuts (P>0.05). Whilst the drumstick had significantly the lowest value for ash content when compared to the thigh. Saturated fatty acids (SFAs) and total unsaturated fatty acids (TUFAs) were not different (P>0.05) in all the cuts. Drumstick had significantly higher monounsaturated fatty acids compared to other cuts (P<0.05), and it had the highest polyunsaturated fatty acids (P<0.05). The breast had the lowest (P<0.05) n-6 fatty acid value (44.25) and had relatively the lowest Polyunsaturated:Saturated (P:S) fatty acid ratio of 1.74 when compared to the other cuts. High n-6:n-3 ratios, ranging from 7.05 to 16.58, were also found in all the cuts. Cholesterol was lowest (P<0.05) in the breast. Seventeen amino acids were found, including the eight of the nine essential amino acids. Significant differences were found in amino acid values for the different cuts. Values of iron were significantly higher in the drumstick and thigh cuts (P<0.05), whilst drumstick had the highest zinc content of all the cuts (P<0.05). On investigating the effect of three cooking methods (baking-bag, foil-wrap, open-roasting at 140ºC for 65 minutes) on the chemical composition, the open-roasting method produced higher moisture content (P<0.05) consistently for all cuts, with the breast having the highest and the drumstick the lowest (P<0.05). The moisture content of the baking-bag method on the other hand was consistently the lowest (P>0.05). This effect was significant for the breast, which had lost the most moisture (P<0.05). The baking-bag method consistently resulted in a higher protein content, which is attributed to the higher moisture loss (P<0.05) in comparison with the other methods, resulting in a more concentrated product. With regard to the fat content no effect resulting from the cooking methods could be observed (P>0.05), but the cuts’ natural fat content was reflected especially in the open–roasting method (P<0.05) giving further support to the understanding that the open-roasting method indeed made the least inroads on the chemical composition of guinea fowl meat under these restraints: controlled for cooking time and temperature, internal temperature not controlled. All the cuts cooked according to all the methods, had the favourable >0.4 Polyunsaturated:Saturated fatty acids (P:S) ratio, ranging from 0.91 to 1.42 between cuts and treatments. The n-6:n-3 ratio was below the recommended beneficial value, namely <4:1, in all the cuts irrespective of all the cooking methods, ranging from 2.47 to 3.08. The study of the effect of the three cooking methods (baking-bag, foil-wrap and open-roast) on the sensory attributes of the breast meat revealed that aroma-intensity of the three cooking treatments did not differ significantly (P>0.05). Foil-wrap produced a more tender and juicier product (P<0.05), while, when using the baking-bag method, values for flavour decreased (P<0.05). It is proposed that a higher internal temperature (which was not controlled) was attained when using the baking-bag method (temperature and time controlled) resulting in loss of volatile flavour components. The effect of the three cooking methods (baking-bag, foil-wrap and open-roast) on the proximate composition (moisture, protein, fat and ash) of raw and cooked breast meat was investigated. As anticipated raw breast meat had higher moisture content (74.55%, P<0.05) than the cooked cuts, with open-roasting showing the highest (68.55%) value and foil-wrap close second (68.12%). These values differed significantly from the baking-bag method (66.06%, P<0.05). An investigation on the effect of brine infusion on the sensory attributes and chemical composition (proximate and fatty acid composition, and mineral content) of breast meat, baked in foil-wrap, was carried out using descriptive sensory analysis with the injected breast and the control as variable. There were no significant differences (P>0.05) between the injected and the control samples for any of the sensory attributes of aroma, tenderness, initial juiciness, sustained juiciness and flavour. Judge:treatment variations were observed for all the attributes, and samples differed for all attributes except for aroma. It is proposed that the use of the hand injector could not effectively distribute the brine solution, hence the recommendation to repeat the experiment using an electronic multineedle-injector. No effect was observed for the proximate composition (P>0.05). Further research pertaining to cooking methods of meat of free-range guinea fowl is recommended to address certain issues that have been highlighted.
- ItemOndersoek na moontlikhede vir entrepreneuriese ontwikkeling in 'n landelike toerisme-area(Stellenbosch : Stellenbosch University, 2003-03) Le Roux, Anneri; Botha, M. J.; Van der Merwe, M. E.; Stellenbosch University. Faculty of Science. Dept. of Consumer Science.ENGLISH ABSTRACT: Poverty and unemployment are currently serious socio-economic problems in South Africa. One way of dealing with this problem is entrepreneurial development. Growth in the tourism sector, specifically in rural tourism, has increased substantially in South Africa in the last decade. Facilities, services and products offered by entrepreneurs are part of the South African tourism industry. This trend created a need for information concerning tourists' needs regarding products and services. The primary aim of this study was thus to investigate the needs of tourists regarding products and services which can lead to entrepreneurial development in a rural tourism setting. A literature review has been undertaken to provide an in-depth report concerning the literature that forms the theoretical basis for this study. Definition of relevant terms, the link between tourism and recreation and the positive and negative impacts of tourism were discussed. Rural tourism and sustainable tourism development were discussed next, followed by literature regarding the tourist, his/her shopping behavior and the importance of crafts. Employment generation, entrepreneurship, entrepreneurial development in tourism, entrepreneurial training and the link between entrepreneurship and crafts were also discussed. The geographical demarcation of the study was the rural town of Darling on the South African West Coast and the 15 km radius surrounding the town. This region is a popular tourist destination. Despite this, unemployment is still a serious problem. A situation analysis of the available facilities in Darling was done to determine which products, services and attractions the relevant businesses and artists of the area offer to tourists. The data analysis of the information that was gathered through document analysis and structured interviews showed that the area is popular with nature as well as culture lovers. To be able to determine the needs and compile a profile of the average tourist that visits a rural town like Darling. Tourists were approached to serve as respondents for the study. A sample was taken and the respondents completed self-administered questionnaires. Frequency and contingency tables were constructed to compile a tourist profile and to identify the needs of tourists visiting a rural region like Darling. On account of this data, shortcomings were identified between that which Darling offers and the needs of tourists. Recommendations were made concerning ways to address these shortcomings in a manner that can/may facilitate entrepreneurial development and at the same time use the existing facilities in Darling. The conclusions suggest that the businesses and artists involved in this study contribute towards tourism and to a certain extent satisfy tourists' needs. Respondents indicated, inter alia, a need for products that are unique to the area. In light of the fact that a typical "Darling product" was not identified in the situation analysis, this was found to be a particularly severe shortcoming. Recommendations were made to address the identified shortcomings by way of training programmes aimed at facilitating entrepreneurial development in Darling.
- ItemPerceived importance of retail store image attributes to the female large-size apparel consumer in a multicultural society(Stellenbosch : Stellenbosch University, 2002-12) Janse van Noordwyk, H. S.; Visser, E. M.; Van der Merwe, M. E.; Stellenbosch University. Faculty of Science.ENGLISH ABSTRACT: An opportunity currently exists for retailers to develop store image strategies to target the female large-size apparel consumer market within the multicultural South African consumer society. This exploratory study set out to generate and describe retail store image attributes perceived as important to the female large-size apparel consumer within the South African context, as well as identifying differences and similarities in the perception of these attributes based on race and age group. The study also aimed to determine if the existing store image attribute groupings by Lindquist (1974-1975:31) is applicable when studying the female largesize apparel consumer. Focus groups were used as method of data collection in this study. The sample population (n=37) consisted of account holders who purchased apparel from a specific large-size apparel retail store during a specific time period. Three race groups, namely Africans, Coloureds, and Whites, as well as three age groups i.e. 20-29, 30-39, and 40-54 year age groups were included. Each focus group was homogenous in race and age composition. A facilitator conducted group discussions by following a focus group schedule. The first part of the discussion generated retail store image attributes deemed important by the focus group participants, followed by the rating of the perceived importance of these attributes using the Schutte Visual Scale. The second part of the discussion generated participants' description of Lindquist's nine identified store image attribute groupings, followed by the rating of the perceived importance of each of these attribute groupings using the Schutte Visual Scale. Transcriptions of all the focus group discussions were made. For the first part of the study the transcriptions were compiled into composite lists and refined based on Lindquist's nine attribute groupings. The aggregate ratings for each specific attribute and attribute grouping were calculated. For the second part of the study's results, the descriptions of each of Lindquist's nine attribute groupings was compiled into a single list of descriptive attributes. The aggregate ratings for each of these attributes groupings were calculated. Respondents perceived Merchandise and Clientele the most important attribute groupings in the analysis of all race and age groups, followed by Service, Post-transaction satisfaction, Promotion and Store atmosphere. Institutional factors and Physical facilities were perceived as the least important attribute groupings. No attributes relating to Convenience were generated. In the analysis of race and age groups, Merchandise and Service, followed by Store atmosphere, were perceived as the most important attribute groupings by most of the focus groups. The specific attributes generated by the different groups showed similarities, whereas the rating and definition of these attributes differed. Lindquist's descriptions of the nine attribute groupings were compared to the descriptions of the respondents. Similarities and differences were identified. Recommendations were made to refine and adapt Lindquist's attribute groupings and descriptions to develop a store image research framework that could be more applicable to the female large-size apparel consumer. This exploratory study provides some insight into the perceived importance of retail store image attributes by the female large-size apparel consumer, given the context of a multi-cultural South African society. Recommendations for future research were made and the implications for retailers were outlined.
- ItemPost-occupancy evaluation of state-subsidised housing units in Kayamandi, Stellenbosch(Stellenbosch : University of Stellenbosch, 2006-03) Darkwa, Irene; Botha, M. J.; Van Wyk, A. S.; University of Stellenbosch. Faculty of Science. Dept. of Consumer Science.The South African government drafted a national housing policy in 1994. This policy is being implemented in terms of seven strategies. One of the housing strategies is to provide subsidy assistance to low-income groups to enable them to become home owners and improve their quality of life. The delivery of state-subsidised housing will help to reduce the housing backlog and to reach the goal of eradicating informal settlements by 2014. The purpose of this study was to determine the levels of housing satisfaction of residents in state-subsidised housing units.
- ItemA post-occupancy evaluation of the Hope City Housing Complex of the Greater Middelburg Housing Association, Mpumalanga(Stellenbosch : Stellenbosch University, 2004-03) Moja, Bontlefeela; Van Wyk, A. S.; Stellenbosch University. Faculty of Science. Dept. of Consumer Science.ENGLISH ABSTRACT: The Housing White Paper (Department of Housing, 1994: 12) sets out the government's broad housing policy and the seven strategies undertaken in the implementation of the policy. One of the strategies is the mobilisation of housing credit through the establishment of the Social Housing Foundation (SHF). The SHF provides training, advice, and support to emerging and established social housing institutions. These housing institutions deliver high density subsidised rental or installment sale housing to the beneficiaries of the State housing subsidy scheme. The Greater Middelburg Housing Association (GMHA) is an example of such an institution. Social housing in South Africa aims at addressing the broader quality of life of their residents, beyond the physical dwelling in which they reside. Furthermore, the aim is to build rental housing, which adheres to suitable quality standards, and is located close to economic opportunities and amenities (Crofton & Venter, 2000:7). To determine the satisfaction levels experienced by residents with regard to different aspects of their housing situation, a Post- Occupancy Evaluation survey can be used to determine whether the objectives of the social housing institution have been met by the housing provided. The main objective of this research study was to determine the level of housing satisfaction experienced by residents of the Greater Middelburg Housing Association's Hope City Housing Complex. The secondary objectives of the study were derived from the main objective and were, firstly, to determine the residents' socio-demographic and socio-economic profiles, and secondly to determine the residents' satisfaction levels with regard to the housing unit, the housing complex and the management of the housing project. Thirdly the residents' overall satisfaction with their housing situation, were determined, and lastly recommendations were made for future developments and improvements of the Hope City Housing Complex. To achieve these objectives, a post-occupancy evaluation study was conducted among a randomly selected sample of 150 tenants residing in the complex. Data were obtained through a structured questionnaire, which entailed dichotomous, multiple choice, scaled, matrix-type and open-ended questions. The scaled questions were answered on a four-point scale, where the tenants' opinions on certain aspects of the housing unit, complex and management, were rated. The questionnaire was administered during individual interviews of 40 minutes each, with the head or the spouse of the head of the selected households. A document-study of the GMHA was conducted to gain insight into the organisation's background, aims and goals. The research results on the socio-demographic and socio-economic profile of the respondents indicated that the target market of the housing institution was mostly couples, between the ages of 21 and 40 years, who had dependants. The majority of the respondents indicated that they would prefer to own housing at this stage of their lives, but that they are satisfied with renting until they have the financial means to buy property. Most respondents had achieved grade 12 schooling and were formally employed, earning monthly household incomes between R2 000 and R3 500. Few respondents reported that they were saving regularly, and only a small number of tenants had been in arrears with their rental payment. The results indicated that the respondents were satisfied with their overall housing situation, but had complaints about specific aspects of the housing unit, the complex and the management. Statistically a negative correlation was found between the satisfaction levels with the unit, complex and management indicators and overall housing satisfaction. Concerning the unit, the respondents felt that the units, and especially the bedrooms, were too small. They felt that the complex did not provide facilities that are needed by the residents, such as play areas for children and a convenience store. Respondents were also dissatisfied with the way in which tenants, who have defaulted on their rental payments, were treated by management. Furthermore, respondents were dissatisfied with the relationship between the management of the housing complex and the residents. The main reason for their dissatisfaction was management's low response rate to maintenance complaints. The GMHA should encourage the tenants to attend the Tenant Training Programmes run by the management. These programmes should outline the responsibilities of the management and the responsibilities of the residents with regard to the maintenance of the housing units. The GMHA should also look into providing the installment sale option as a tenure option to the residents, as this would enable those tenants, who would like to buy property, to do so.
- ItemProtection of the long chain N-3 polyunsaturated fatty acids in hake head flour against oxidation(Stellenbosch : Stellenbosch University, 2003-03) Nolte, Noreen Kathleen; Hoffman, Louwrens C.; Dalton, A.; Stellenbosch University. Faculty of Science. Dept. of Consumer Science.ENGLISH ABSTRACT: Please refer to full text for abstract
- ItemThe quality attributes of South African rabbit meat and consumer attitudes towards it(Stellenbosch : Stellenbosch University, 2004-03) Nkhabutlane, Pulane; Hoffman, Louwrens C.; Vosloo, M. C.; Schutte, De W.; Stellenbosch University. Faculty of Science. Dept. of Consumer Science.ENGLISH ABSTRACT: Meat processing industries in South Africa are faced with the challenge to produce a variety of white meats. This is due to the fact that consumers tend to consume less red meat and more chicken and pork that are perceived to be healthier due to the negative publicity surrounding red meat and health. The nutritional emphasis is on leaner carcasses and an increase in the consumption of polyunsaturated fatty acids while reducing the ratio of n-6:n-3 polyunsaturated fats in the diet. Another way in which this can be achieved is through introducing rabbit meat which has low fat, low cholesterol content and high protein content, while displaying a positive fatty acid profile. Carcass quality and meat quality in rabbits may to a large extent be affected by age of slaughter and type of breed. This study had a dual purpose. Firstly it aimed at quantifying the effects of breed and age on parameters pertaining to carcass quality and meat quality of commercial rabbits, namely California breed and hybrid (California x Dutch red). Secondly, to determine the differences between ethnic groups on their perceptions towards rabbit meat, thereby providing information on its marketing potential. To accomplish the first objective 50 rabbits from the two breeds were housed in individual cages, weighed on weekly basis and fed ad libitum. The rabbits were slaughtered at 9, 11, 13, 15 and 17 weeks of age (n=5 from each breed). For the second objective the perceptions of three ethnic groups on factors affecting consumers' choice of rabbit meat were determined through a structured questionnaire. The questionnaire was tested for validity beforehand. There was no significant difference between the two breeds regarding body weight, feed intake, carcass weight and drip loss. The California breed had a higher dressing percentage (53.7%) and meat yield (29.2%) compared to the hybrid (52.5% and 27.5% respectively). Age treatments showed a highly significant difference on all parameters investigated. Increasing the age proportionately increased the amount of fat, while the moisture content decreased. The California breed exhibited higher percentages of fat compared to the hybrid at all ages of treatment. California breed contained more phosphorus, magnesium and zinc as opposed to the hybrid, the only exception being copper, where the hybrid had higher concentrations. The total fatty acid (169.2 mg/100 g) of the California breed was higher than that of the hybrid (133.5 mg/100 g). As a result there were more saturated fatty acids (55.4 mg/100 g) and monounsaturated fatty acids (62.3 mg/100 g) in the California breed than in the hybrid (44.2 and 45.6 mg/100 g respectively). Both breeds had 67% unsaturated fatty acids. Although there was no significant difference between the P:S ratio of the two rabbit breeds, the values obtained were higher (+0.9) than the value of 0.7. This is an indication that the rabbit meat contains a P:S ratio that could be considered very desirable. The n-6:n-3 ratio for both breeds were high (11.6 for California and 12.7 for hybrid). The cholesterol and amino acid profile of the two breeds were not affected by the type of breed. The consumer survey indicated that 52% (n=158) of respondents had never eaten rabbit meat before due to reasons such as scarcity, lack of knowledge about the meat, associating rabbits with pets and cultural constraints. Nevertheless, 57% of these people were optimistic about eating rabbit meat. In addition, having eaten rabbit meat before seemed to contribute positively towards acceptance of rabbit meat. Generally, respondents preferred purchasing rabbit meat in portions as opposed to live or whole carcasses. Their decision to purchase rabbit meat was firstly driven by price, thereafter freshness, leanness and tenderness of meat. The respondents expect to buy rabbit meat at a price lower than that of chicken. Rabbit meat contained low sodium and high proportion polyunsaturated fatty acids-some of the most important food attributes required to maintain and improve health. However, most of the respondents in this study were not familiar with the positive attributes of rabbit meat and need to be taught the benefits of this product.
- ItemVerkennende studie van die menings van vroulike werknemers, van geselekteerde Suid-Afrikaanse maatskappye, jeens korporatiewe drag(Stellenbosch : Stellenbosch University, 2000-03) Frick, Beatrice Liezel; Van der Merwe, M. E.; Viljoen, L.; Stellenbosch University. Faculty of Science.ENGLISH ABSTRACT: Clothing is an important phenomenon within corporate and organisational culture and forms an integral part of the total corporate identity. It fulfills a symbolic purpose and serves as a reference. It is a way in which companies can change or modernise their image as it is conveyed to clients. Little research has been done on uniform types of clothing, even though it has been an important phenomenon in the subject area of Clothing for ages. South African companies offers unique opportunities for research within a multi-cultural environment and Consumer Science's distinctive multi-disciplinary approach makes it an ideal starting point for this type of study. Three environments are concerned with the phenomenon of corporate clothing, namely the employers and employees of organisations or companies, academia of educational establishments and the manufacturers of corporate clothing. The study concerned tried to investigate the phenomenon of corporate clothing within the South African corporate environment. This was firstly done by studying the available clothing literature and describing aspects which have direct or indirect relations to corporate clothing. Information and advice was obtained from experts to gain insight into the South African circumstances with relation to corporate clothing. Secondly, employees who wear corporate clothing were questioned as to their opinions on specific aspects with regards to corporate clothing. This was done by means of a questionnaire which was developed to determine if employees of selected South African companies see corporate clothing as representative of company image, culture and policy. The extent to which extent employees are involved in decision-making processes with regards to corporate clothing was also determined. Employees' opinions with regards to consumer requirements and the extent of satisfaction with corporate clothing was determined. The extent to which age and position within the company playa role in employees' opinions of corporate clothing were investigated according to the information obtained through the questionnaire. The above mentioned information was structured to give possible guidelines to companies with in the implimentation and development of corporate clothing within the existing organisational culture. This study did not focus on manufacturers of corporate clothing, but it is assumed that they can benefit from the findings of the study. The study will contribute to the building of theory in the subject area of Clothing and consequently also contribute to the academical field.