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Usefulness of the neo PI-R personality profiles in the selection of psychology master's applicants

- Hurter, Kim

  • Authors: Hurter, Kim
  • Date: 2009
  • Subjects: NEO Personality Inventory , Dregrees, Academic -- South Africa
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: vital:9907 , http://hdl.handle.net/10948/d1009640 , NEO Personality Inventory , Dregrees, Academic -- South Africa
  • Description: Each year, psychology departments across South Africa are faced with the arduous task of selecting the most suitable candidates to fill their Clinical, Counselling, Educational, and Industrial Psychology master’s coursework programmes. Although various criteria are considered in this process, personality has long been considered an important variable in the screening and selection of master’s psychology applicants, and some sort of personality assessment is commonly utilized by selection committees as part of the screening and selection procedures. While there are many different theoretical perspectives on personality and various personality assessment measures available, the Five-Factor Model (FFM) of personality has gained considerable attention over the last decade as a comprehensive and universal conceptualization of a broad trait structure for human personality. Currently, the Revised NEO Personality Inventory (NEO PI-R) is considered to be one of the best commercially available measures of the personality traits proposed by this model. The NEO PI-R provides a comprehensive measure of adult personality, has been extensively researched, and has demonstrated its utility across many different cultures, languages, and contexts. The aim of this study was to explore and describe the personality profiles of short-listed master’s psychology applicants at a higher education institution in South Africa, using the NEO PI-R, in an effort to explore the use of NEO PI-R profiles in the selection of master’s psychology applicants. The study was exploratory descriptive in nature and employed a quantitative research method. The sample of 247 participants was selected according to non-probability convenience sampling and was sourced from an archival research database. As part of the application process at the higher education institution, applicants were required to complete various tests, tasks, and questionnaires. The questionnaires selected for this study included a biographical questionnaire, used to describe the biographical variables of the sample, and the NEO PI-R (Costa & McCrae, 1992), used as a measure of personality. The NEO PI-R has been found to have good validity and reliability, with reliability in particular having being established in the South African context. Descriptive and inferential statistics, including correlations, cluster xiv analysis, and multivariate analysis of variance (ANOVA), were utilized to analyze the data. Key findings revealed that overall, the group of short-listed master’s psychology applicants could be described as being emotionally well-adjusted and sociable, which is in line with previous national and international research. In addition, a cluster analysis revealed three significantly different personality subgroups within the total sample, thus highlighting the heterogeneous nature of this sample of applicants. Each of the three personality subgroups exhibited significantly different personality traits which were judged to be more or less suitable for potential psychologists-in-training. Clusters 1 and 2 exhibited the most desirable personality characteristics in relation to selection into a master’s psychology programme, while Cluster 3 exhibited the least desirable traits. Various classification functions were derived which classified applicants into “selected” and “not selected” groups as well as the three personality subgroups, which could aid selection committees in the future to screen out potentially unsuitable candidates earlier in the selection process. It was concluded that the use of NEO PI-R personality profiles could aid the screening and selection of short-listed master’s psychology applicants.
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  • Date Issued: 2009

Using a transdisciplinary framework to examine mathematics classroom talk taking place in and through a second language

- Graven, Mellony, Robertson, Sally-Ann

  • Authors: Graven, Mellony , Robertson, Sally-Ann
  • Date: 2009
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/69838 , vital:29586 , https://DOI: 10.1007/s11858-018-0952-2
  • Description: This paper proposes a transdisciplinary framework to allow for a multifocal exploration of classroom talk practices. It draws on data from a broader study of talk in South African Grade 4 mathematics classrooms where the language of teaching and learning (English) was the home language for neither the teachers nor their students. Lesson transcript data from one teacher’s lessons on fractions are used to demonstrate how working with three strands of conceptual insight from the disciplines of psychology, sociology and linguistics conduces to a potentially richer understanding of a teacher’s use of classroom talk in mediating her students’ mathematical understanding. By drawing on elements of Vygotsky’s sociocultural psychology, we make visible in the lesson data the ways in which this teacher used the ‘everyday’ in trying to navigate her students’ towards more ‘scientific’ conceptualizations of unit fractions. By then taking up aspects of Bernstein’s sociological work, we articulate, and make visible, how societal circumstances impinge on students’ access to exploratory mathematical discourse needed for epistemological access to abstract and generalized mathematical concepts. Finally, through Halliday’s work on the power of particular linguistic registers for meaning-making, we highlight challenges in learning mathematics in and through a second language and reveal the constraints placed on students’ opportunity to maximally exploit the distinct forms of meaning contained within the mathematics register.
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  • Date Issued: 2009

Using pictograms in a patient information leaflet to communicate antiretroviral medicines information to HIV/AIDS patients in rural South Africa:

- Dowse, Roslind

  • Authors: Dowse, Roslind
  • Date: 2009
  • Language: English
  • Type: text , book
  • Identifier: http://hdl.handle.net/10962/156817 , vital:40053 , ISBN
  • Description: The objectives were to design a simple, illustrated patient information leaflet for the antiretroviral regimen of stavudine, lamivudine and efavirenz and to evaluate its readability and acceptability in the local Xhosa population. In order to achieve this, a further objective was to design and evaluate illustrations to include in the patient information leaflet which were culturally acceptable and well interpreted. Illustrations or pictograms were designed to illustrate selected instructions appearing in the patient information leaflet and were individually tested in 30 Xhosa participants who had a maximum of 8 years of formal schooling. Results were used to improve the pictograms for inclusion in the patient information leaflet. The patient information leaflet was designed and tested in sixty Xhosa participants with varied levels of education who had stated they could read. Demographic data were collected and they were then asked to read the patient information leaflet, available in both English and isiXhosa, and a series of questions was asked to assess its comprehension and acceptability. The overall average rate of understanding was 95. Six of the 20 questions were located and understood by all participants, and only two questions resulted in less than an 85 correct response. Physical appearance and quantity of information were highly rated and all participants were enthusiastic about the inclusion of pictograms.
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  • Date Issued: 2009

Using semantic knowledge to improve compression on log files

- Otten, Frederick John

  • Authors: Otten, Frederick John
  • Date: 2009 , 2008-11-19
  • Subjects: Computer networks , Data compression (Computer science) , Semantics--Data processing
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:4650 , http://hdl.handle.net/10962/d1006619 , Computer networks , Data compression (Computer science) , Semantics--Data processing
  • Description: With the move towards global and multi-national companies, information technology infrastructure requirements are increasing. As the size of these computer networks increases, it becomes more and more difficult to monitor, control, and secure them. Networks consist of a number of diverse devices, sensors, and gateways which are often spread over large geographical areas. Each of these devices produce log files which need to be analysed and monitored to provide network security and satisfy regulations. Data compression programs such as gzip and bzip2 are commonly used to reduce the quantity of data for archival purposes after the log files have been rotated. However, there are many other compression programs which exist - each with their own advantages and disadvantages. These programs each use a different amount of memory and take different compression and decompression times to achieve different compression ratios. System log files also contain redundancy which is not necessarily exploited by standard compression programs. Log messages usually use a similar format with a defined syntax. In the log files, all the ASCII characters are not used and the messages contain certain "phrases" which often repeated. This thesis investigates the use of compression as a means of data reduction and how the use of semantic knowledge can improve data compression (also applying results to different scenarios that can occur in a distributed computing environment). It presents the results of a series of tests performed on different log files. It also examines the semantic knowledge which exists in maillog files and how it can be exploited to improve the compression results. The results from a series of text preprocessors which exploit this knowledge are presented and evaluated. These preprocessors include: one which replaces the timestamps and IP addresses with their binary equivalents and one which replaces words from a dictionary with unused ASCII characters. In this thesis, data compression is shown to be an effective method of data reduction producing up to 98 percent reduction in filesize on a corpus of log files. The use of preprocessors which exploit semantic knowledge results in up to 56 percent improvement in overall compression time and up to 32 percent reduction in compressed size. , TeX , pdfTeX-1.40.3
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  • Date Issued: 2009

Using the van Hiele theory to analyse geometrical conceptualisation in grade 12 students: a Namibian perspective

- Mateya, Muhongo

  • Authors: Mateya, Muhongo
  • Date: 2009
  • Subjects: Hiele, Pierre M. van Hiele-Geldof, Dina van Geometry -- Study and teaching (Secondary) -- Namibia Mathematics -- Study and teaching (Secondary) -- Namibia
  • Language: English
  • Type: Thesis , Masters , MEd
  • Identifier: vital:1820 , http://hdl.handle.net/10962/d1003706
  • Description: The study reported here utilised a theory of levels of geometric thinking. This theory was proposed and developed by two Dutch mathematics educators, Pierre van Hiele and his wife, Dina van Hiele-Geldof. The van Hiele theory enables investigations into why many students experience difficulties in learning geometry. In many nations, such as the UK, the USA, Netherlands, the USSR and to a certain extent, Nigeria and South Africa, research evidence has indicated that the overall students’ mathematical competencies are linked to their geometric thinking levels. This study is the first of its kind to apply the van Hiele theory of geometric thinking in the Namibian context to analyse geometrical conceptualisation in Grade 12 mathematics students. In all, 50 Grade 12 students (20 from School A and 30 from School B) were involved in this study. These students wrote a van Hiele Geometry Test adapted from the Cognitive Development and Achievement in Secondary School Geometry test items. Thereafter, a clinical interview with the aid of manipulatives was conducted. The results from this study indicated that many of the School A and School B students who participated in the research have a weak conceptual understanding of geometric concepts: 35% of the School A and 40% of the School B subsamples were at the prerecognition level. 25% and 30% of the School A, and 20% and 23.3% of the School B students were at van Hiele levels 1 and 2 respectively. An equal number of students but different in percentages, 2 (10%) in School A and 2 (6.7%) in School B, were at van Hiele level 3. Only one student from School B attained van Hiele level 4. These results were found to be consistent with those of previous similar studies in UK, USA, Nigeria and South Africa. The findings of this study also highlight issues of how the Namibian Grade 12 geometry syllabus should be aligned with the van Hiele levels of geometric thinking as well as the use of appropriate and correct language in geometrical thinking and problem solving.
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  • Date Issued: 2009

Utopianism and educational processes in the United Nations Decade of Education for Sustainable Development

- Lotz-Sisitka, Heila

  • Authors: Lotz-Sisitka, Heila
  • Date: 2009
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/184756 , vital:44269 , xlink:href="https://cjee.lakeheadu.ca/article/view/866"
  • Description: Recent international policy literature on Education for Sustainable Development puts forward utopian concepts of sustainable development and transformed learning as objects for educational thinking and practice. This paper, drawing on three illustrative educational investigations with youth in a South African context, critically examines how we might engage with utopian concepts such as those put forward in the United Nations Decade of Education for Sustainable Development. It incorporates an engagement with other related utopian concepts such as democracy and social justice, which feature strongly in post-apartheid societal reconstruction in South Africa. The paper argues that if we are to avoid valuable utopian concepts such as democracy, sustainability, and social justice from becoming doxic knowledge, a reflexive realist orientation might best guide our educational engagements with such concepts. Such an approach to utopianism would take account of contextual realities and situated learning processes, and foster a creativity of action that is constructivist in nature, but not relativist.
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  • Date Issued: 2009

Utopianism and educational processes in the United Nations Decade of Education for Sustainable Development: a critical reflection

- Lotz-Sisitka, Heila

  • Authors: Lotz-Sisitka, Heila
  • Date: 2009
  • Subjects: To be catalogued
  • Language: English
  • Type: text , book chapter
  • Identifier: http://hdl.handle.net/10962/437367 , vital:73373 , ISBN 978-9086860937 , https://doi.org/10.3920/9789086866915_007
  • Description: South Africa and its recent political transformation pro-cess, infused with hope for a better future, is often pre-sented as a utopian form of democracy – or an icon of hope – nationally and in the contemporary global land-scape. Similarly, adult hopes for youth, and youth idealism itself, are often utopian in nature, and young people are often iconised in society as the hope for the future. Re-cent international policy literature on education for sus-tainable development puts forward the utopian concepts of sustainable development and transformed learning (UNESCO 2005a) as objects for educational thinking and practice, and ethical codes such as the Earth Charter (www.earthcharter.org) present useful visions and guid-ance on how to think about and create a better world. But, the realities of the day keep such utopianism in check. Today, South Africa is experiencing xenophobic vio-lence, extreme levels of crime, and continued disenfran-chisement.
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  • Date Issued: 2009

Valuing preferences for freshwater inflows into five Eastern Cape and Kwazulu-Natal estuaries

- Chege, Jedidah

  • Authors: Chege, Jedidah
  • Date: 2009
  • Subjects: Estuarine ecology -- South Africa -- Eastern Cape , Estuarine ecology -- South Africa -- Kwazulu-Natal , Freshwater ecology -- South Africa -- Eastern Cape , Estuaries -- South Africa -- Eastern Cape , Estuaries -- Management -- South Africa
  • Language: English
  • Type: Thesis , Masters , MCom
  • Identifier: vital:8990 , http://hdl.handle.net/10948/932 , Estuarine ecology -- South Africa -- Eastern Cape , Estuarine ecology -- South Africa -- Kwazulu-Natal , Freshwater ecology -- South Africa -- Eastern Cape , Estuaries -- South Africa -- Eastern Cape , Estuaries -- Management -- South Africa
  • Description: An estuary, according to the National Water Act of 1998, is a partially or fully enclosed body of water which is open periodically or permanently to the sea within which the sea water can be diluted, to an extent that is measurable with freshwater from inland. Estuaries and the lands surrounding them are places of transition from land to sea, and from freshwater to saltwater. Although influenced by the tides, estuaries are protected from the full force of ocean waves, winds, and storms by the reefs, barrier islands, or fingers of land, mud, or sand that surround them. South Africa’s estuaries are important and irreplaceable habitats, especially for prawns, fish, wading birds and mangroves. They are home to numerous plants and animals that live in water that is partly fresh and partly salty. Estuaries are also homes to growing coastal communities as increasing number of people occupy watersheds. However, estuaries are also threatened. One of the threats is reduced river water inflow. This study applies the contingent valuation method (CVM) to elicit user’s willingness to pay to mitigate the negative impacts of reduced freshwater inflow into selected five Eastern Cape and Kwazulu-Natal estuaries: the Sundays, Gamtoos, Mdloti, Mgeni and Mvoti estuaries. In addition to the contingent valuation method, the travel cost method was used to generate comparative values. The contingent valuation method is a technique to establish the value of a good (or service) that is not bought or sold in an actual market. The CVM establishes the economic value of the good by asking the users of an environmental good to state their willingness to pay (WTP) for a hypothetical project to prevent, or bring about, a change in the current condition of the environmental good. The users’ WTP is aggregated to establish a total willingness to pay (TWTP) for the population of the users of the environmental good.
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  • Date Issued: 2009

Valuing preferences for freshwater inflows into selected Western and Southern Cape estuaries

- Akoto, William

  • Authors: Akoto, William
  • Date: 2009
  • Subjects: Estuarine ecology -- South Africa , Freshwater ecology -- South Africa , Estuaries -- South Africa
  • Language: English
  • Type: Thesis , Masters , MCom
  • Identifier: vital:8992 , http://hdl.handle.net/10948/915 , Estuarine ecology -- South Africa , Freshwater ecology -- South Africa , Estuaries -- South Africa
  • Description: An estuary is the last stage of a river. It is where the river meets the sea. Estuaries are one of the most significant features of the South African coastline. In recent years, South Africa has witnessed an increase in the demand for freshwater for both industrial and domestic purposes. At the same time, there has been a gradual deterioration of river systems and their catchments. To add to this, there has been a gradual reduction in the amount of recorded rainfall, which is the primary source of freshwater for rivers. This has resulted in decreased freshwater inflow into estuaries, a situation which poses a serious threat to the biological functioning of these estuaries and the services rendered to its recreational users. A deterioration of estuary services reduces the yield for subsistence households and their appeal for recration. This study uses the contingent valuation method as its primary methodology to elicit users' willingness-to-pay to reduce the negative impacts of reduced freshwater inflow into selected western and southern Cape estuaries. Eight estuaries were selected for this study; the Breede, Duiwenhoks, Great Berg, Kleinemond West, Mhlathuze, Swartvlei and Olifants estuaries. The contingent valuation (CV) method is widely used for studies of this nature because of its ability to capture active, passive and non-use values. The CV method involves directly asking people how much they would be willing to pay for specific environmental services. In this case, users were asked what they would be willing to pay to sustain freshwater inflows into selected estuaries in order to prevent the negative impacts of reduced inflows. The travel cost method (TCM) was uesed to generate an alternative comparative set of values for the purposes of convergence testing. This is because convergence testing is highly desirable as a validity test for CV estimates.
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  • Date Issued: 2009

Van dagboek tot reisjoernaal : 'n literêre ondersoek na intertekstualiteit in Bidsprinkaan (2005) van André P. Brink

- Nagel, Amilinda

  • Authors: Nagel, Amilinda
  • Date: 2009
  • Subjects: Brink, André Philippus, 1935-2015. Bidsprikaan , Afrikaans fiction -- 21st century -- History and criticism
  • Language: Afrikaans
  • Type: Thesis , Masters , MA
  • Identifier: vital:8457 , http://hdl.handle.net/10948/1050 , Brink, André Philippus, 1935-2015. Bidsprikaan , Afrikaans fiction -- 21st century -- History and criticism
  • Description: The dissertation offers a reception study followed by a critical analysis of Bidsprinkaan by André P. Brink [Praying Mantis, 2005], as well as a careful study of the relevant historical and anthropological intertexts pertaining to the text. This research adds to a fuller understanding of the history of Cupido Kakkerlak and the missionaries. Brink encoded the novel with certain historical and anthropological codes, well-hidden beneath the surface of his fictional writing, thus achieving a finely balanced interaction between fact and fiction in his novelistic construct. This novelistic amalgam of the imaginative world with the historical and anthropological material, gives multidimensionality to the text which is not visible at a first superficial reading. Failing to recognize the traces to these intertexts, would result in a lesser understanding of the conflicting fields in which the main character is positioned, specifically between indigenous belief and Christianity, as well as between indigenous culture and mythology on the one hand, and western culture on the other hand. The author ‘encodes’ the novel (to use the terminology of Jakobson’s communication model) with these historical and anthropological intertexts, which the reader has to ‘decode’ in order to unlock the novel. One central technique therefore, is that of interwoven fact and fiction. This is a technique employed in most of Brink’s novels, such as ‘n Oomblik in die wind, 1975 [An Instant in the Wind], Houd-den-Bek, 1982 [A chain of voices,], Die eerste lewe van Adamastor, 1986 [The First Life of Adamastor, 1993], Inteendeel, 1993 [On the Contrary, 1993] and Duiwelskloof, 1998 [Devil’s Valley, 1998]. Khoi and San history, culture and identity also figure centrally in these novels. A further aspect of my hypothesis is suggested by the politically correct Afrikaans title, Bidsprinkaan (the common nomenclature for the praying mantis is “hotnotsgot”, which roughly translates as “hottentots’ god”, with obvious racial pejorative suggestion). Brink’s use of “bidsprinkaan” for his title, alerts the reader to contemporary political sensitivity, thus contrasting the society of two centuries ago with the present. The more sophisticated reading process followed here compares colonial and postcolonial South African societies, and attempts to tease out the implied ideological facet embedded in the novel.
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  • Date Issued: 2009

Variability analysis of a sample of potential southern calibration sources

- Hungwe, Faith

Variability in the fractionation of stable isotopes during degradation of two intertidal red algae

- Hill, Jaclyn M, McQuaid, Christopher D

  • Authors: Hill, Jaclyn M , McQuaid, Christopher D
  • Date: 2009
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/444649 , vital:74257 , https://doi.org/10.1016/j.ecss.2009.02.001
  • Description: Macroalgae contribute to intertidal food webs primarily as detritus, with unclear implications for food web studies using stable isotope analysis. We examined differences in the thallus parts of two South African rhodophytes (Gelidium pristoides and Hypnea spicifera) and changes in overall δ13C, δ15N signatures and C:N ratios during degradation in both the field and laboratory. We hypothesized that both degrading macroalgal tissue and macroalgal-derived suspended particulate material (SPM) would show negligible changes in δ13C, but enriched δ15N signatures and lower C:N ratios relative to healthy plants. Only C:N laboratory ratios conformed to predictions, with both species of macroalgae showing decomposition related changes in δ13C and significant depletions in δ15N in both the field and laboratory. In the laboratory, algal tissue and SPM from each species behaved similarly (though some effects were non-significant) but with differing strengths. Gelidium pristoides δ13C increased and C:N ratios decreased over time in tissue and SPM; δ15N became depleted only in SPM. Hypnea spicifera, δ13C, δ15N and C:N ratios all decreased during degradation in both SPM and algae.
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  • Date Issued: 2009

Vincent van Gogh : a psychobiographical study

- Muller, Heather Ruby

  • Authors: Muller, Heather Ruby
  • Date: 2009
  • Subjects: Psychology -- Biographical methods
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: vital:9880 , http://hdl.handle.net/10948/1293 , Psychology -- Biographical methods
  • Description: The aim of this study is to create a psychobiography of Vincent Van Gogh who was born in 1853 and died 1890. To Van Gogh art was not merely a means for an income, he converted all his aspirations and anguish into his art works. In doing so his art became the first example of a truly personal art, to him art was a deeply lived means of spiritual salvation, which he used as a means to transform himself. It was well known that Van Gogh was unstable and felt misunderstood in life, often asking “What is the use?” . He had a method of fusing what he saw in the world, and what he personally felt, into works of art that were revelations of himself. Van Gogh lived a lonely life, although for the last seventeen years of his life he wrote to his brother, Theo, almost daily. These letters give much insight to the thoughts and inner world of a much misunderstood individual. Most of these letters have been preserved and much else has been written about Van Gogh’s life and art. In our modern day he is deemed one of the most famous artists, yet in his lifetime he only sold one painting. This psychobiography employs a qualitative psychobiographical research method, which aims to describe Van Gogh’s psychological development in terms of Erik Erikson’s psychosocial developmental stages. Van Gogh was chosen as the research subject because of personal interest, his value as a famous artist, and because of the unique way in which he saw and related to the world.
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  • Date Issued: 2009

Vocational language learning and how it relates to language policy issues

- Maseko, Pamela

Vocational language learning and teaching at a South African university: preparing professionals for multilingual contexts

- Maseko, Pamela, Kaschula, Russell H

  • Authors: Maseko, Pamela , Kaschula, Russell H
  • Date: 2009
  • Subjects: Intercultural communication in education -- South Africa , African languages , Cultural awareness , Communication and culture , Multilingualism -- South Africa
  • Language: English
  • Type: article , text
  • Identifier: http://hdl.handle.net/10962/59412 , vital:27597 , doi: 10.5842/38-0-60
  • Description: This paper highlights the methodology that has been used at Rhodes University and other South African universities in implementing vocation-specific African language learning programmes. Essentially, the paper links the curriculum design to the theoretical paradigm of intercultural communication. Intercultural theory is used as a basis to develop vocation-specific courses where language and culture are taught, for example, to second language learners of isiXhosa at Rhodes University. These courses include courses for Pharmacy and Law students. This paper offers a new theoretical paradigm for intercultural language teaching. Furthermore, examples from specific courses are provided in order to illustrate how this theoretical paradigm can be implemented in a practical way. The impact of multilingualism and intercultural communication in the wider legal and healthcare work environment in South Africa is also discussed.
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  • Date Issued: 2009

Warthog as an introduced species in the Eastern Cape

- Nyafu, Kanyisa

  • Authors: Nyafu, Kanyisa
  • Date: 2009
  • Subjects: Warthog -- South Africa -- Eastern Cape
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:10701 , http://hdl.handle.net/10948/1058 , Warthog -- South Africa -- Eastern Cape
  • Description: The introduced common warthog, Phacochoerus africanus, in the Eastern Cape is increasing rapidly both in numbers and distribution, despite attempts by landowners to reduce numbers and exclude warthogs. These control attempts are motivated by concerns over the impacts of warthogs, on vegetation, soil and other animal species. This expansion of warthog populations is paradoxical given that a species of warthog occurred historically in this part of the world, apparently at low densities and was wiped out in the mid-1800s. The question therefore arises as to why warthogs are able to overcome population regulation attempts now, and this becomes an invasive species issue as the species now occurring in the Eastern Cape is in fact an introduced species. The objectives of the study were to investigate the status of warthogs as an introduced invasive species in the Eastern Cape by documenting the rate and direction of population expansion, ecological impacts and possible dietary shift of the introduced species, P. africanus compared to the extinct species P. aethiopicus. The research approach adapted here was to test the hypotheses that, (1) the success of P. africanus in the Eastern Cape reflects dietary differences of the two species based on observations of different dental adaptations, as P. africanus has functional incisors, which are absent in P. aethiopicus. Stable carbon isotope analysis of the tooth enamel was used to determine the diet of the two species. (2) Common warthogs are specialized grazers and will impact on a limited range of grass species, this hypothesis was addressed by describing the diet of common warthogs in one site in the Eastern Cape to identify plant species at risk due to invasion by P. africanus, and microhistological faecal analysis was used. (3) Common warthogs have successfully expanded their range in the Eastern Cape since their introduction and are now showing impact, this was addressed by describing the range of expansion of P. africanus in the Eastern Cape, as well as reviewing landowner perceptions of the impacts of warthogs, this was based on questionnaire surveys distributed in the Sundays and the Fish River valleys. The results of the study showed that there are differences in the diet of Cape warthog P. aethiopicus and common warthog P. africanus. The Cape warthog was largely a grazer (86 percent C4 grasses in their diet), while P. africanus is also a grazer (71 percent of C4 grasses in their diet), but with a larger proportion of browse in their diet. These results support the hypothesis that the presence of functional incisors in the common warthog might provide the common warthog with foraging advantages over the Cape warthog. This might be a contributing factor to the success of this invasive species in the Eastern Cape, and might explain the rapid disappearance of Cape warthogs in the 1800s, which coincided with rapid expansion of herds of domestic grazers. A total of twelve grass species are used by common warthogs and are therefore most vulnerable to impacts of this invasive species. Common warthogs are rapidly expanding their range particularly around the Sundays and the Great Fish River valleys and they are perceived by landowners to have impacts on grass cover, soils and fencing. This spread of warthog in the Eastern Cape exhibits characteristics of an invasive species. In light of the findings of this study, it is therefore important that government authorities and other parties concerned recognize that common warthogs are invasive in the Eastern Cape.
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  • Date Issued: 2009

Water-soluble phthalocyanines mediated photodynamic effect on mesothelioma cells

- Saydan, Nil, Durmus, Mahmut, Dizge, Meltem G, Yaman, Hanif, Gürek, Ayşe G, Antunes, Edith M, Nyokong, Tebello, Ahsen, Vefa

  • Authors: Saydan, Nil , Durmus, Mahmut , Dizge, Meltem G , Yaman, Hanif , Gürek, Ayşe G , Antunes, Edith M , Nyokong, Tebello , Ahsen, Vefa
  • Date: 2009
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/263480 , vital:53631 , xlink:href="https://doi.org/10.1142/S1088424609000863"
  • Description: The new peripherally 2-mercaptopyridine tetrasubstituted zinc phthalocyanine (2) and its quaternized derivative (3) have been synthesized and characterized by elemental analysis, IR, 1H NMR spectroscopy, electronic spectroscopy and mass spectra. The quaternized compound (3) shows excellent solubility in water, which makes it a potential photosensitizer for use in photodynamic therapy (PDT) of cancer. Fluorescence and singlet oxygen quantum yield measurements were conducted on 2-mercaptopyridine appended zinc phthalocyanines in dimethylsulphoxide (DMSO) for both the non-ionic (2) and quaternized (3) derivatives, and in aqueous media for the water-soluble complex 3. General trends are described for fluorescence and singlet oxygen quantum yields of these compounds. In this study, the cells were incubated with a novel water-soluble zinc phthalocyanine derivative (3) and thereafter the cells were illuminated using broad-band incoherent light source of various energy levels. Cytotoxicity of PDT on two pleural malign mesothelioma cell lines was determined by colorimetric proliferation assay. In addition, after PDT treatment, determination of activity matrix metalloproteinases (MMPs) were evaluated using gelatine zymography.
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  • Date Issued: 2009

Wax discrimination in the Lesser Honeyguide Indicator minor

- Hepburn, H Randall

  • Authors: Hepburn, H Randall
  • Date: 2009
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/448440 , vital:74730 , https://doi.org/10.2989/OSTRICH.2009.80.2.11.838
  • Description: Beeswaxes consist of complex mixtures of homologous neutral lipids that vary among species of honeybees but share many compounds in common (Aichholz and Lorbeer 1999). However, the beeswaxes of subspecies of the honeybee, Apis mellifera, can only be distinguished after careful calculation of the peak elution pattern area ratios of selected compounds (Brand-Garnys and Sprenger 1988). This is of interest in an ornithological context because honeyguides (Indicatoridae) subsist in large measure on the pillage of the combs of honeybees (Friedman 1955) and their enzymic capacity to digest beeswax has been demonstrated experimentally (Friedmann and Kern 1956, Diamond and Place 1988, Downs et al. 2002). Honeyguides can utilise olfactory orientation to find beeswax (Stager 1967, Archer and Glen 1969) and can even detect and seek out the combs of honeybees stored in hives devoid of bees in darkened out-buildings (HRH pers. obs.).
  • Full Text:
  • Date Issued: 2009

We are all the public

- Pithouse, Richard, 1970-

  • Authors: Pithouse, Richard, 1970-
  • Date: 2009
  • Language: English
  • Type: Article
  • Identifier: vital:6198 , http://hdl.handle.net/10962/d1008562
  • Description: [from introduction]: Across the country the most vulnerable people in our society are being subject to brazenly unlawful and often violent action at the hands of the state. Homeless people, refugees, sex workers, street traders and shack dwellers are all being taught, in the most literal sense of the term, to know their place. But state illegality is not only aimed at the segregation of physical space. It is also about ensuring that the people on the margins of society know their political place.
  • Full Text:
  • Date Issued: 2009

We need a conversation about development

- Pithouse, Richard, 1970-

  • Authors: Pithouse, Richard, 1970-
  • Date: 2009
  • Language: English
  • Type: Article
  • Identifier: vital:6199 , http://hdl.handle.net/10962/d1008563
  • Description: [From the introduction] From the Communist Party across to the corporate spin-doctors and down to the Development Committees in the shack settlements, more or less everybody in South Africa speaks the language of development. In some ways this is a good thing. It indicates a hard won agreement that the realities of inequality in our society are so cruel and perverse that any social project can only be credible if it will ameliorate these divisions and the suffering they cause.
  • Full Text:
  • Date Issued: 2009
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