Reflections on the appropriate use of unjustly conferred privilege:
- Authors: Matthews, Sally
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/142314 , vital:38068 , DOI: 10.3167/th.2013.6013502
- Description: What ought beneficiaries of injustice to do with the privileges unjustly conferred upon them? This article examines how those who have been privileged as a consequence of injustice can best contribute to struggles for justice. In particular, I ask whether we ought to renounce privileges which have been unjustly conferred, or whether it may be better to use such privileges in ways that help bring about justice. The article engages in particular with feminist literature on the topic of privilege, building on arguments provided in this literature to argue that in many cases the best contribution the privileged can make to struggles for justice, is to use unjustly conferred privileges in a way that ultimately undermines the unjust systems and structures that conferred them. I tentatively outline some ways in which the privileged can develop the sensibilities which will allow them to use their privilege in this way.
- Full Text:
- Authors: Matthews, Sally
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/142314 , vital:38068 , DOI: 10.3167/th.2013.6013502
- Description: What ought beneficiaries of injustice to do with the privileges unjustly conferred upon them? This article examines how those who have been privileged as a consequence of injustice can best contribute to struggles for justice. In particular, I ask whether we ought to renounce privileges which have been unjustly conferred, or whether it may be better to use such privileges in ways that help bring about justice. The article engages in particular with feminist literature on the topic of privilege, building on arguments provided in this literature to argue that in many cases the best contribution the privileged can make to struggles for justice, is to use unjustly conferred privileges in a way that ultimately undermines the unjust systems and structures that conferred them. I tentatively outline some ways in which the privileged can develop the sensibilities which will allow them to use their privilege in this way.
- Full Text:
Rehearsing or reversing harmful masculine scripts?: South African men's romance narratives
- Vincent, Louise, Chiwandire, Desire
- Authors: Vincent, Louise , Chiwandire, Desire
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141844 , vital:38009 , DOI: 10.1080/10130950.2013.807081
- Description: In this Article we discuss the results of 42 in-depth qualitative interviews with young black South African men who self-identified as heterosexual and who reported that they were at the time of the interview or had at some time in their lives, experienced being ‘in love’ with a woman. South Africa, as is commonly pointed out, is in the throes of an epidemic of gender based violence. To declare oneself ‘in love’ potentially contradicts some of the core features of what Mogomotsi Mfalapitsa (IRIN, 2009) has referred to as ‘harmful masculinity’ and which he has argued is causally related to male violence against women. These features include emotional detachment, promiscuity, interest in casual sex rather than long-term engagement with a single partner, unwillingness to be ‘tied down’, the hierarchical ordering of gendered relations constructed as men's entitlement to women's ‘respect’ and the need to publically enact masculine heterosexuality. We are interested in whether, in these narratives, the research participants position themselves in opposition to these harmful precepts or, whether they confirm and reiteratively perform assumptions that can be construed as damaging to the prospects of generating more equitable, fair and loving relations between men and women.
- Full Text:
- Authors: Vincent, Louise , Chiwandire, Desire
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141844 , vital:38009 , DOI: 10.1080/10130950.2013.807081
- Description: In this Article we discuss the results of 42 in-depth qualitative interviews with young black South African men who self-identified as heterosexual and who reported that they were at the time of the interview or had at some time in their lives, experienced being ‘in love’ with a woman. South Africa, as is commonly pointed out, is in the throes of an epidemic of gender based violence. To declare oneself ‘in love’ potentially contradicts some of the core features of what Mogomotsi Mfalapitsa (IRIN, 2009) has referred to as ‘harmful masculinity’ and which he has argued is causally related to male violence against women. These features include emotional detachment, promiscuity, interest in casual sex rather than long-term engagement with a single partner, unwillingness to be ‘tied down’, the hierarchical ordering of gendered relations constructed as men's entitlement to women's ‘respect’ and the need to publically enact masculine heterosexuality. We are interested in whether, in these narratives, the research participants position themselves in opposition to these harmful precepts or, whether they confirm and reiteratively perform assumptions that can be construed as damaging to the prospects of generating more equitable, fair and loving relations between men and women.
- Full Text:
Residency and small-scale movement behaviour of three endemic sparid fishes in their shallow rocky subtidal nursery habitat, South Africa
- Watt-Pringle, Peter A, Cowley, Paul D, Gotz, Albrecht
- Authors: Watt-Pringle, Peter A , Cowley, Paul D , Gotz, Albrecht
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/443584 , vital:74135 , https://hdl.handle.net/10520/EJC137608
- Description: The residency and small-scale movements of early juveniles (175 mm fork length) of three sparid fish species were examined in the shallow subtidal zone along a 500 m stretch of rocky coastline near Schoenmakerskop (Eastern Cape Province, South Africa). A total of 12 blacktail (Diplodus capensis), 12 zebra (Diplodus hottentotus) and six white musselcracker (Sparodon durbanensis) were tagged using visible implant elastomer (VIE) tags. Underwater observations in four shallow rocky subtidal gullies and adjacent areas were made using snorkelling gear on a total of 37 days spanning 13 field trips over spring low tide periods between January and August 2006. The VIE tagging method was well suited to individually tag small juvenile fish with minimum disturbance. In general, the degree of residency of juveniles in the shallow rocky subtidal zone was species specific and dependent on the size of individuals. Juvenile zebra displayed the highest degree of residency followed by white musselcracker and blacktail, with re-sightings recorded on 53%, 40% and 10% of observation days, respectively. The high degree of residency by early juvenile sparids renders them vulnerable to localized coastal perturbations and climate change.
- Full Text:
- Authors: Watt-Pringle, Peter A , Cowley, Paul D , Gotz, Albrecht
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/443584 , vital:74135 , https://hdl.handle.net/10520/EJC137608
- Description: The residency and small-scale movements of early juveniles (175 mm fork length) of three sparid fish species were examined in the shallow subtidal zone along a 500 m stretch of rocky coastline near Schoenmakerskop (Eastern Cape Province, South Africa). A total of 12 blacktail (Diplodus capensis), 12 zebra (Diplodus hottentotus) and six white musselcracker (Sparodon durbanensis) were tagged using visible implant elastomer (VIE) tags. Underwater observations in four shallow rocky subtidal gullies and adjacent areas were made using snorkelling gear on a total of 37 days spanning 13 field trips over spring low tide periods between January and August 2006. The VIE tagging method was well suited to individually tag small juvenile fish with minimum disturbance. In general, the degree of residency of juveniles in the shallow rocky subtidal zone was species specific and dependent on the size of individuals. Juvenile zebra displayed the highest degree of residency followed by white musselcracker and blacktail, with re-sightings recorded on 53%, 40% and 10% of observation days, respectively. The high degree of residency by early juvenile sparids renders them vulnerable to localized coastal perturbations and climate change.
- Full Text:
Rhino poaching: supply and demand uncertain
- Collins, Alan, Fraser, Gavin C G, Snowball, Jeanette D
- Authors: Collins, Alan , Fraser, Gavin C G , Snowball, Jeanette D
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/70476 , vital:29665 , https://doi.org/10.1126/science.340.6137.1167-a
- Description: IN THEIR POLICY FORUM “LEGAL TRADE OF AFRICA’S RHINO HORNS” (1 MARCH, P. 1038), D. Biggs et al. point out that the trade ban on rhino horn has not been successful in reducing rhino poaching, which reached a record high of 668 in 2012. They argue that trade bans support illegal organizations, whereas a regulated legal market could reduce poaching effort and provide much-needed income for conservation. In making their case, Biggs et al. overlook a few important points.
- Full Text:
- Authors: Collins, Alan , Fraser, Gavin C G , Snowball, Jeanette D
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/70476 , vital:29665 , https://doi.org/10.1126/science.340.6137.1167-a
- Description: IN THEIR POLICY FORUM “LEGAL TRADE OF AFRICA’S RHINO HORNS” (1 MARCH, P. 1038), D. Biggs et al. point out that the trade ban on rhino horn has not been successful in reducing rhino poaching, which reached a record high of 668 in 2012. They argue that trade bans support illegal organizations, whereas a regulated legal market could reduce poaching effort and provide much-needed income for conservation. In making their case, Biggs et al. overlook a few important points.
- Full Text:
Rules of attraction: the role of bait in small mammal sampling at high altitude in South Africa
- Kok, Armand D, Parker, Daniel M, Barker, Nigel P
- Authors: Kok, Armand D , Parker, Daniel M , Barker, Nigel P
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/443936 , vital:74173 , https://doi.org/10.1080/15627020.2013.11407571
- Description: Baits or lures are commonly used for surveying small mammal communities, not only because they attract large numbers of these animals, but also because they provide sustenance for trapped individuals. In this study we used Sherman live traps with five bait treatments to sample small mammal populations at three high-altitude sites (>1700 m) in the Sneeuberg Mountain Complex of the Eastern Cape Province, South Africa.We investigated the influence of bait treatment on three parameters commonly recorded in small mammal surveys. In addition, we investigated how different bait treatments vary in measuring species richness using the Chao 2 species richness estimator together with rarefaction curves. Overall, 12 small mammal species were sampled. A combination of birdseed and banana captured the highest number of species (11) but the most successful bait overall was peanut butter and oats (greatest number of captures, recaptures, number of individuals and highest Shannon diversity). The Chao 2 richness estimator indicated that four of the five bait treatments reached their sampling capacity. Rarefaction curves indicated that all bait treatments are similar with regard to species accumulation. This could possibly be explained by odours left behind in traps as even un-baited traps (i.e. controls) captured seven different small mammal species. We conclude that the most suitable bait for surveying small mammals at high altitude in South Africa is peanut butter and oats. However, using peanut butter and oats in combination with other bait treatments will improve estimates of diversity when surveying small mammal communities.
- Full Text:
- Authors: Kok, Armand D , Parker, Daniel M , Barker, Nigel P
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/443936 , vital:74173 , https://doi.org/10.1080/15627020.2013.11407571
- Description: Baits or lures are commonly used for surveying small mammal communities, not only because they attract large numbers of these animals, but also because they provide sustenance for trapped individuals. In this study we used Sherman live traps with five bait treatments to sample small mammal populations at three high-altitude sites (>1700 m) in the Sneeuberg Mountain Complex of the Eastern Cape Province, South Africa.We investigated the influence of bait treatment on three parameters commonly recorded in small mammal surveys. In addition, we investigated how different bait treatments vary in measuring species richness using the Chao 2 species richness estimator together with rarefaction curves. Overall, 12 small mammal species were sampled. A combination of birdseed and banana captured the highest number of species (11) but the most successful bait overall was peanut butter and oats (greatest number of captures, recaptures, number of individuals and highest Shannon diversity). The Chao 2 richness estimator indicated that four of the five bait treatments reached their sampling capacity. Rarefaction curves indicated that all bait treatments are similar with regard to species accumulation. This could possibly be explained by odours left behind in traps as even un-baited traps (i.e. controls) captured seven different small mammal species. We conclude that the most suitable bait for surveying small mammals at high altitude in South Africa is peanut butter and oats. However, using peanut butter and oats in combination with other bait treatments will improve estimates of diversity when surveying small mammal communities.
- Full Text:
Section 40 of the Consumer Protection Act in comparative perspective: aantekeninge
- Authors: Glover, Graham B
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/70527 , vital:29672 , https://hdl.handle.net/10520/EJC144971
- Description: The purpose of this comment is to consider some of the problems with how we are to understand the role and purpose of section 40 of South Africa's Consumer Protection Act 68 of 2008 when viewed from a doctrinal perspective. Section 40 has the heading "Unconscionable conduct", and contains three subsections.
- Full Text: false
- Authors: Glover, Graham B
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/70527 , vital:29672 , https://hdl.handle.net/10520/EJC144971
- Description: The purpose of this comment is to consider some of the problems with how we are to understand the role and purpose of section 40 of South Africa's Consumer Protection Act 68 of 2008 when viewed from a doctrinal perspective. Section 40 has the heading "Unconscionable conduct", and contains three subsections.
- Full Text: false
Seeing Fictions in Film
- Authors: Jones, Ward E
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/275711 , vital:55072 , xlink:href="https://doi.org/10.1080/00048402.2013.818044"
- Description: Although its subtitle refers to an ‘epistemology of movies’, the claim at the heart of George M. Wilson’s dense and penetrating book is a bit of sophisticated phenomenology concerning our experience of narrative fiction films [Chs 2–4]. This phenomenological claim he calls the ‘Imagined Seeing Thesis’. When we watch narrative fiction films, we imagine that we are seeing real motion picture shots of the fictional events being portrayed.
- Full Text:
- Authors: Jones, Ward E
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/275711 , vital:55072 , xlink:href="https://doi.org/10.1080/00048402.2013.818044"
- Description: Although its subtitle refers to an ‘epistemology of movies’, the claim at the heart of George M. Wilson’s dense and penetrating book is a bit of sophisticated phenomenology concerning our experience of narrative fiction films [Chs 2–4]. This phenomenological claim he calls the ‘Imagined Seeing Thesis’. When we watch narrative fiction films, we imagine that we are seeing real motion picture shots of the fictional events being portrayed.
- Full Text:
Sexy girls, heroes and funny losers: gender representations in children's TV around the world edited by Maya Gotz and Dafna Lemish
- Authors: Boshoff, Priscilla A
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/143505 , vital:38252 , DOI: 10.1080/10130950.2013.839116
- Description: Gotz and Lemish have brought together in this volume a range of research which derives from the project they initiated in 2007 from the International Central Institute for Youth and Educational Television (IZI). Researchers in 24 countries around the world participated in this unique project, and the results, discussed at the 2008 and 2010 Prix Jeunesse International, prompted hopes that the producers of children's television would be persuaded to pay more concerted attention to issues of gender in their programming. Whether or not such a utopian outcome might be expected from this initiative is open to future question. For our immediate purposes however, the value of this collection is that it draws together in one volume some of the results from both the original quantitative survey and the subsequent qualitative analyses that examined specific themes emerging from the data.
- Full Text:
- Authors: Boshoff, Priscilla A
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/143505 , vital:38252 , DOI: 10.1080/10130950.2013.839116
- Description: Gotz and Lemish have brought together in this volume a range of research which derives from the project they initiated in 2007 from the International Central Institute for Youth and Educational Television (IZI). Researchers in 24 countries around the world participated in this unique project, and the results, discussed at the 2008 and 2010 Prix Jeunesse International, prompted hopes that the producers of children's television would be persuaded to pay more concerted attention to issues of gender in their programming. Whether or not such a utopian outcome might be expected from this initiative is open to future question. For our immediate purposes however, the value of this collection is that it draws together in one volume some of the results from both the original quantitative survey and the subsequent qualitative analyses that examined specific themes emerging from the data.
- Full Text:
Silica nanoparticles grafted with phthalocyanines
- Fashina, Adebayo, Antunes, Edith M, Nyokong, Tebello
- Authors: Fashina, Adebayo , Antunes, Edith M , Nyokong, Tebello
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/232545 , vital:50001 , xlink:href="https://doi.org/10.1039/C3NJ00439B"
- Description: Silica nanoparticles grafted with phthalocyanines (tetra-substituted non-peripherally with 4-carboxyphenoxy and 3-carboxyphenoxy groups) have been synthesized, characterized and their photophysical properties evaluated in solution. The phthalocyanine dyes have a free carboxyl group facilitating the covalent attachment of the dye onto the silica surface via ester bond formation. The photophysical properties of the hybrid nanoparticles show higher fluorescence and triplet quantum yields as well as longer triplet lifetimes as compared to the free phthalocyanines. The triplet quantum yields were found to be higher for the phthalocyanines with ester bonds as compared to the amide bonded linkages. The silica nanoparticles were also studied in artificial lysosomal fluid over a period of 96 h and the dissolution of the nanoparticles was monitored and confirmed using inductively coupled plasma optical emission spectrometry.
- Full Text:
- Authors: Fashina, Adebayo , Antunes, Edith M , Nyokong, Tebello
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/232545 , vital:50001 , xlink:href="https://doi.org/10.1039/C3NJ00439B"
- Description: Silica nanoparticles grafted with phthalocyanines (tetra-substituted non-peripherally with 4-carboxyphenoxy and 3-carboxyphenoxy groups) have been synthesized, characterized and their photophysical properties evaluated in solution. The phthalocyanine dyes have a free carboxyl group facilitating the covalent attachment of the dye onto the silica surface via ester bond formation. The photophysical properties of the hybrid nanoparticles show higher fluorescence and triplet quantum yields as well as longer triplet lifetimes as compared to the free phthalocyanines. The triplet quantum yields were found to be higher for the phthalocyanines with ester bonds as compared to the amide bonded linkages. The silica nanoparticles were also studied in artificial lysosomal fluid over a period of 96 h and the dissolution of the nanoparticles was monitored and confirmed using inductively coupled plasma optical emission spectrometry.
- Full Text:
South African quality of life trends over three decades, 1980–2010
- Authors: Moller, Valerie
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/67145 , vital:29040 , https://doi.org/10.1007/s11205-012-0120-y
- Description: publisher version , The South African Quality of Life Trends study has tracked the subjective well-being of South Africans in ten waves from 1983 to 2010. The paper presents the SAQoL trendline of life satisfaction, happiness and perceptions of life getting better or worse against the backdrop of the transition from apartheid to democracy. Subjective well-being peaked in the month following the first open elections in April 1994 when black and white South Africans were equally satisfied and happy at levels found in other democratic societies. But post-election euphoria was short-lived and levels of well-being dropped the following year and racial inequalities in evaluations of life re-emerged. The tenth and latest wave in the study was conducted a few months after South Africa’s successful hosting of the Soccer World Cup. In 2010, the proportions of all South Africans expressing satisfaction, happiness and optimism was among the highest since the coming of democracy—just over half stated they were satisfied, close on two-thirds were happy, and half felt life was getting better. Nonetheless, while the standard of living has increased for a minority of formerly disadvantaged South Africans and a small black middle class has emerged, there are still huge disparities in both material and subjective well-being. In 1997 and 2010, South Africans were asked what would make them happier in future. In 2010, the majority of citizens still hoped for basic necessities, income and employment, to enhance their quality of life.
- Full Text: false
- Authors: Moller, Valerie
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/67145 , vital:29040 , https://doi.org/10.1007/s11205-012-0120-y
- Description: publisher version , The South African Quality of Life Trends study has tracked the subjective well-being of South Africans in ten waves from 1983 to 2010. The paper presents the SAQoL trendline of life satisfaction, happiness and perceptions of life getting better or worse against the backdrop of the transition from apartheid to democracy. Subjective well-being peaked in the month following the first open elections in April 1994 when black and white South Africans were equally satisfied and happy at levels found in other democratic societies. But post-election euphoria was short-lived and levels of well-being dropped the following year and racial inequalities in evaluations of life re-emerged. The tenth and latest wave in the study was conducted a few months after South Africa’s successful hosting of the Soccer World Cup. In 2010, the proportions of all South Africans expressing satisfaction, happiness and optimism was among the highest since the coming of democracy—just over half stated they were satisfied, close on two-thirds were happy, and half felt life was getting better. Nonetheless, while the standard of living has increased for a minority of formerly disadvantaged South Africans and a small black middle class has emerged, there are still huge disparities in both material and subjective well-being. In 1997 and 2010, South Africans were asked what would make them happier in future. In 2010, the majority of citizens still hoped for basic necessities, income and employment, to enhance their quality of life.
- Full Text: false
Stable isotope analysis indicates a lack of inter-and intra-specific dietary redundancy among ecologically important coral reef fishes
- Plass-Johnson, Jeremiah G, McQuaid, Christopher D, Hill, Jaclyn M
- Authors: Plass-Johnson, Jeremiah G , McQuaid, Christopher D , Hill, Jaclyn M
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/444611 , vital:74254 , https://doi.org/10.1007/s00338-012-0988-7
- Description: Parrotfish are critical consumers on coral reefs, mediating the balance between algae and corals, and are often categorised into three functional groups based on adult morphology and feeding behaviour. We used stable isotope analysis (δ13C, δ15N) to investigate size-related ontogenetic dietary changes in multiple species of parrotfish on coral reefs around Zanzibar. We compared signatures among species and functional groups (scrapers, excavators and browsers) as well as ontogenetic stages (immature, initial and terminal phase) within species. Stable isotope analysis suggests that ontogenetic dietary shifts occurred in seven of the nine species examined; larger individuals had enriched δ13C values, with no relationship between size and δ15N. The relationship between fish length and δ13C signature was maintained when species were categorised as scrapers and excavators, but was more pronounced for scrapers than excavators, indicating stronger ontogenetic changes. Isotopic mixing models classified the initial phase of both the most abundant excavator (Chlorurus sordidus) as a scraper and the immature stage of the scraper Scarus ghobban (the largest species) as an excavator, indicating that diet relates to size rather than taxonomy. The results indicate that parrotfish may show similar intra-group changes in diet with length, but that their trophic ecology is more complex than suggested by morphology alone. Stable isotope analyses indicate that feeding ecology may differ among species within functional groups, and according to ontogenetic stage within a species.
- Full Text:
- Authors: Plass-Johnson, Jeremiah G , McQuaid, Christopher D , Hill, Jaclyn M
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/444611 , vital:74254 , https://doi.org/10.1007/s00338-012-0988-7
- Description: Parrotfish are critical consumers on coral reefs, mediating the balance between algae and corals, and are often categorised into three functional groups based on adult morphology and feeding behaviour. We used stable isotope analysis (δ13C, δ15N) to investigate size-related ontogenetic dietary changes in multiple species of parrotfish on coral reefs around Zanzibar. We compared signatures among species and functional groups (scrapers, excavators and browsers) as well as ontogenetic stages (immature, initial and terminal phase) within species. Stable isotope analysis suggests that ontogenetic dietary shifts occurred in seven of the nine species examined; larger individuals had enriched δ13C values, with no relationship between size and δ15N. The relationship between fish length and δ13C signature was maintained when species were categorised as scrapers and excavators, but was more pronounced for scrapers than excavators, indicating stronger ontogenetic changes. Isotopic mixing models classified the initial phase of both the most abundant excavator (Chlorurus sordidus) as a scraper and the immature stage of the scraper Scarus ghobban (the largest species) as an excavator, indicating that diet relates to size rather than taxonomy. The results indicate that parrotfish may show similar intra-group changes in diet with length, but that their trophic ecology is more complex than suggested by morphology alone. Stable isotope analyses indicate that feeding ecology may differ among species within functional groups, and according to ontogenetic stage within a species.
- Full Text:
Stock returns and Friday the 13th effect in five African countries
- Authors: Botha, Ferdi
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/396127 , vital:69152 , xlink:href="https://www.ajol.info/index.php/aref/article/view/91060"
- Description: This study is concerned with Friday the 13th and daily stock market returns in five African countries. Using the MSCI Global Equity Indices during various periods, the evidence overwhelmingly suggests that there is no Friday the 13th effect.
- Full Text:
- Authors: Botha, Ferdi
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/396127 , vital:69152 , xlink:href="https://www.ajol.info/index.php/aref/article/view/91060"
- Description: This study is concerned with Friday the 13th and daily stock market returns in five African countries. Using the MSCI Global Equity Indices during various periods, the evidence overwhelmingly suggests that there is no Friday the 13th effect.
- Full Text:
Subterranean control of an arboreal pest: EPNs and EPFs for FCM
- Moore, Sean D, Coombes, Candice A, Manrakhan, Aruna, Kirkman, Wayne, Hill, Martin P, Ehlers, Ralf-Udo, Daneel, John-Henry, De Waal, Jeanne, Dames, Joanna F, Malan, Antoinette P
- Authors: Moore, Sean D , Coombes, Candice A , Manrakhan, Aruna , Kirkman, Wayne , Hill, Martin P , Ehlers, Ralf-Udo , Daneel, John-Henry , De Waal, Jeanne , Dames, Joanna F , Malan, Antoinette P
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/425450 , vital:72241 , xlink:href="https://www.cabdirect.org/cabdirect/abstract/20133257699"
- Description: Control measures against the false codling moth (FCM), Thaumatotibia leucotreta, have traditionally ignored the soil-borne pupal stage. Recent trials with entomopathogenic nematodes (EPNs) and entomopathogenic fungi (EPFs) have targeted this life-stage. Application of Heterorhabditis bacteriophora to a citrus orchard floor, reduced T. leucotreta infestation of fruit by up to 81%. Conservation of H. zealandica through non-usage of a nematicide also resulted in dramatically lower fruit infestation. Dose-response and exposure time-response bioassays identified the three most promising fungal isolates against pupating T. leucotreta. Orchard trials showed persistence of these fungi in orchard soil for at least six months.
- Full Text:
- Authors: Moore, Sean D , Coombes, Candice A , Manrakhan, Aruna , Kirkman, Wayne , Hill, Martin P , Ehlers, Ralf-Udo , Daneel, John-Henry , De Waal, Jeanne , Dames, Joanna F , Malan, Antoinette P
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/425450 , vital:72241 , xlink:href="https://www.cabdirect.org/cabdirect/abstract/20133257699"
- Description: Control measures against the false codling moth (FCM), Thaumatotibia leucotreta, have traditionally ignored the soil-borne pupal stage. Recent trials with entomopathogenic nematodes (EPNs) and entomopathogenic fungi (EPFs) have targeted this life-stage. Application of Heterorhabditis bacteriophora to a citrus orchard floor, reduced T. leucotreta infestation of fruit by up to 81%. Conservation of H. zealandica through non-usage of a nematicide also resulted in dramatically lower fruit infestation. Dose-response and exposure time-response bioassays identified the three most promising fungal isolates against pupating T. leucotreta. Orchard trials showed persistence of these fungi in orchard soil for at least six months.
- Full Text:
Surface patterning using scanning electrochemical microscopy to locally trigger a “click” chemistry reaction
- Quinton, Damien, Maringa, Audacity, Griveau, Sophie, Nyokong, Tebello, Bedioui, Fethi
- Authors: Quinton, Damien , Maringa, Audacity , Griveau, Sophie , Nyokong, Tebello , Bedioui, Fethi
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/241805 , vital:50971 , xlink:href="https://doi.org/10.1016/j.elecom.2013.03.021"
- Description: We report on the surface micropatterning of conductive surfaces via the electrochemical triggering of a click reaction, the copper(I) catalyzed azide–alkyne cycloaddition reaction (CuAAC) by SECM via a two-step approach: (i) functionalization on the entire surface with azido-aryl groups by using the diazonium approach followed by (ii) the covalent linkage of alkyne-bearing ferrocene by CuAAC within a local area by SECM. More precisely, the click reaction was triggered by Cu(I) catalyst generation for 30 min at the SECM tip positioned ≈ 10 μm above the azido-aryl modified surface. The dimension of the spot obtained under these conditions was ≈ 75 μm. The electrochemical imaging by SECM of the ultra thin area locally clicked with ferrocene moieties was made thanks to the electrocatalytic properties of the ferrocene modified surface towards ferrocyanide electrooxidation. This local clicking procedure opens the gate to further controlled functionalization of restricted small substrates.
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- Authors: Quinton, Damien , Maringa, Audacity , Griveau, Sophie , Nyokong, Tebello , Bedioui, Fethi
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/241805 , vital:50971 , xlink:href="https://doi.org/10.1016/j.elecom.2013.03.021"
- Description: We report on the surface micropatterning of conductive surfaces via the electrochemical triggering of a click reaction, the copper(I) catalyzed azide–alkyne cycloaddition reaction (CuAAC) by SECM via a two-step approach: (i) functionalization on the entire surface with azido-aryl groups by using the diazonium approach followed by (ii) the covalent linkage of alkyne-bearing ferrocene by CuAAC within a local area by SECM. More precisely, the click reaction was triggered by Cu(I) catalyst generation for 30 min at the SECM tip positioned ≈ 10 μm above the azido-aryl modified surface. The dimension of the spot obtained under these conditions was ≈ 75 μm. The electrochemical imaging by SECM of the ultra thin area locally clicked with ferrocene moieties was made thanks to the electrocatalytic properties of the ferrocene modified surface towards ferrocyanide electrooxidation. This local clicking procedure opens the gate to further controlled functionalization of restricted small substrates.
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Synthesis and magnetic properties of a superparamagnetic nanocomposite pectin-magnetite nanocomposite
- Namanga, Jude, Foba, Josepha, Ndinteh, Derek T, Yufanyi, Divine M, Krause, Rui W M
- Authors: Namanga, Jude , Foba, Josepha , Ndinteh, Derek T , Yufanyi, Divine M , Krause, Rui W M
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125075 , vital:35726 , https://doi.org/10.1155/2013/137275
- Description: Magnetic nanocomposites composed of superparamagnetic magnetite nanoparticles in a pectin matrix were synthesized by anin situ coprecipitation method. The pectin matrix acted as a stabilizer and size control host for the magnetite nanoparticles(MNPs) ensuring particle size homogeneity. The effects of the different reactant ratios and nanocomposite drying conditions onthe magnetic properties were investigated. The nanocomposites were characterized by X-ray diffraction (XRD), scanning electronmicroscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), Fourier-transforminfrared (FT-IR) spectroscopy, and superconducting quantum interference device magnetometer (SQUID). Superparamagneticmagnetite nanoparticles with mean diameters of 9 and 13 nm were obtained, and the freeze-dried nanocomposites had a saturationmagnetization of 54 and 53 emu/g, respectivel
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- Authors: Namanga, Jude , Foba, Josepha , Ndinteh, Derek T , Yufanyi, Divine M , Krause, Rui W M
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125075 , vital:35726 , https://doi.org/10.1155/2013/137275
- Description: Magnetic nanocomposites composed of superparamagnetic magnetite nanoparticles in a pectin matrix were synthesized by anin situ coprecipitation method. The pectin matrix acted as a stabilizer and size control host for the magnetite nanoparticles(MNPs) ensuring particle size homogeneity. The effects of the different reactant ratios and nanocomposite drying conditions onthe magnetic properties were investigated. The nanocomposites were characterized by X-ray diffraction (XRD), scanning electronmicroscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), Fourier-transforminfrared (FT-IR) spectroscopy, and superconducting quantum interference device magnetometer (SQUID). Superparamagneticmagnetite nanoparticles with mean diameters of 9 and 13 nm were obtained, and the freeze-dried nanocomposites had a saturationmagnetization of 54 and 53 emu/g, respectivel
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Synthesis and nonlinear optical examination of 3 (4), 15 (16)-Bis-(4-tert-butyl-phenoxy)-10, 22-diaminohemiporphyrazinato chloroindium
- Britton, Jonathan, Antunes, Edith M, Nyokong, Tebello
- Authors: Britton, Jonathan , Antunes, Edith M , Nyokong, Tebello
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/241739 , vital:50965 , xlink:href="https://doi.org/10.1016/j.molstruc.2013.05.001"
- Description: 3(4),15(16)-Bis-(4-tert-butyl-phenoxy)-10,22-diaminohemiporphyrazinato chloroindium hemiporphyrazine was synthesized from 1,3,5-triaminobenzene and 4-tert-butyl-phenoxyisoindoline. The structure of the complex was confirmed using mass, nuclear magnetic resonance and infrared spectroscopies. The nonlinear parameters of the compound was also analyzed in dimethylformamide and found to be significantly greater than previously analyzed phthalocyanines.
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- Authors: Britton, Jonathan , Antunes, Edith M , Nyokong, Tebello
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/241739 , vital:50965 , xlink:href="https://doi.org/10.1016/j.molstruc.2013.05.001"
- Description: 3(4),15(16)-Bis-(4-tert-butyl-phenoxy)-10,22-diaminohemiporphyrazinato chloroindium hemiporphyrazine was synthesized from 1,3,5-triaminobenzene and 4-tert-butyl-phenoxyisoindoline. The structure of the complex was confirmed using mass, nuclear magnetic resonance and infrared spectroscopies. The nonlinear parameters of the compound was also analyzed in dimethylformamide and found to be significantly greater than previously analyzed phthalocyanines.
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Synthesis and photophysicochemical properties of zinc phthalocyanine derivatized with benzothiazole or carbazole photosensitizers
- Khoza, Phindile, Antunes, Edith M, Nyokong, Tebello
- Authors: Khoza, Phindile , Antunes, Edith M , Nyokong, Tebello
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/241728 , vital:50964 , xlink:href="https://doi.org/10.1016/j.poly.2013.05.046"
- Description: The synthesis of new zinc phthalocyanine complexes containing 3-(2-benzothiazol-2-yloxy) (complex 3) and 3-(carbazol-2-yloxy) (complex 4) substituents at the non-peripheral positions are reported. The new compounds were characterized by elemental analysis, FT-IR, 1H NMR, mass spectrometry and UV–Vis spectroscopy. The effects of carbazole and benzothiazole substitutents on the photophysical and photochemical parameters of ZnPc are reported. These new phthalocyanines are non-aggregated in common solvents and show improved photophysicochemical properties. The 3-(2-benzothiazol-2-yloxy) substituted complex showed the longest triplet lifetime ever reported for a zinc phthalocyanine (1.7 ms).
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- Authors: Khoza, Phindile , Antunes, Edith M , Nyokong, Tebello
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/241728 , vital:50964 , xlink:href="https://doi.org/10.1016/j.poly.2013.05.046"
- Description: The synthesis of new zinc phthalocyanine complexes containing 3-(2-benzothiazol-2-yloxy) (complex 3) and 3-(carbazol-2-yloxy) (complex 4) substituents at the non-peripheral positions are reported. The new compounds were characterized by elemental analysis, FT-IR, 1H NMR, mass spectrometry and UV–Vis spectroscopy. The effects of carbazole and benzothiazole substitutents on the photophysical and photochemical parameters of ZnPc are reported. These new phthalocyanines are non-aggregated in common solvents and show improved photophysicochemical properties. The 3-(2-benzothiazol-2-yloxy) substituted complex showed the longest triplet lifetime ever reported for a zinc phthalocyanine (1.7 ms).
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Synthesis and photophysicochemical studies of a water soluble conjugate between folic acid and zinc tetraaminophthalocyanine
- Khoza, Phindile, Antunes, Edith M, Chen, Ji-Yao, Nyokong, Tebello
- Authors: Khoza, Phindile , Antunes, Edith M , Chen, Ji-Yao , Nyokong, Tebello
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/242142 , vital:51005 , xlink:href="https://doi.org/10.1016/j.jlumin.2012.06.048"
- Description: This work reports on the synthesis of zinc tetraaminophthalocyanine (ZnTAPc) functionalized with folic acid (FA), forming ZnTAPcFA. The conjugate between FA and ZnTAPc was soluble in water whereas ZnTAPc alone is not. The structure of ZnTAPcFA conjugate was elucidated by 1H NMR, MALDI-TOF mass and FTIR spectra. Photophysical and photochemical studies of ZnTAPcFA were conducted in DMSO. The increase in fluorescence quantum yield of the conjugate was accompanied by a decrease in the triplet and singlet oxygen quantum yields. The changes in triplet quantum and singlet oxygen quantum yields were marginal when ZnTAPc was simply mixed with FA without a chemical bond.
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- Authors: Khoza, Phindile , Antunes, Edith M , Chen, Ji-Yao , Nyokong, Tebello
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/242142 , vital:51005 , xlink:href="https://doi.org/10.1016/j.jlumin.2012.06.048"
- Description: This work reports on the synthesis of zinc tetraaminophthalocyanine (ZnTAPc) functionalized with folic acid (FA), forming ZnTAPcFA. The conjugate between FA and ZnTAPc was soluble in water whereas ZnTAPc alone is not. The structure of ZnTAPcFA conjugate was elucidated by 1H NMR, MALDI-TOF mass and FTIR spectra. Photophysical and photochemical studies of ZnTAPcFA were conducted in DMSO. The increase in fluorescence quantum yield of the conjugate was accompanied by a decrease in the triplet and singlet oxygen quantum yields. The changes in triplet quantum and singlet oxygen quantum yields were marginal when ZnTAPc was simply mixed with FA without a chemical bond.
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Synthesis and physicochemical behaviour of aluminium bis and tris (diammine platinum) octacarboxyphthalocyanine
- Malinga, Nduduzo, Antunes, Edith M, Nyokong, Tebello
- Authors: Malinga, Nduduzo , Antunes, Edith M , Nyokong, Tebello
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/241970 , vital:50988 , xlink:href="https://doi.org/10.1016/j.poly.2013.02.073"
- Description: Hydroxy aluminium octacarboxy phthalocyanine (Al(OH)OCPc) was conjugated with a diammine platinum complex to give conjugates containing two or three platinum complexes (represented as: Al(OH)OCPc(Pt)2 and Al(OH)OCPc(Pt)3). It was found that the complexes were soluble in water at a pH > 8.2. Both conjugates were found to have two fluorescence lifetimes. The triplet and singlet oxygen quantum yields increased for the conjugates compared to Al(OH)OCPc alone.
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- Authors: Malinga, Nduduzo , Antunes, Edith M , Nyokong, Tebello
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/241970 , vital:50988 , xlink:href="https://doi.org/10.1016/j.poly.2013.02.073"
- Description: Hydroxy aluminium octacarboxy phthalocyanine (Al(OH)OCPc) was conjugated with a diammine platinum complex to give conjugates containing two or three platinum complexes (represented as: Al(OH)OCPc(Pt)2 and Al(OH)OCPc(Pt)3). It was found that the complexes were soluble in water at a pH > 8.2. Both conjugates were found to have two fluorescence lifetimes. The triplet and singlet oxygen quantum yields increased for the conjugates compared to Al(OH)OCPc alone.
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TeleWeaver: an innovative telecommunication platform for marginalized communities in Africa
- Dalvit, Lorenzo, Gumbo, Sibukelo, Ntshinga, Lindikaya, Terzoli, Alfredo, Hansen, Susan
- Authors: Dalvit, Lorenzo , Gumbo, Sibukelo , Ntshinga, Lindikaya , Terzoli, Alfredo , Hansen, Susan
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/431317 , vital:72763 , https://www.academic-bookshop.com/ourshop/prod_2659103-ECEG-2013-13th-European-Conference-on-eGovernment-Como-Italy-PRINT-version.html
- Description: Information and Communication Technologies for Development (ICT4D) is becoming an increasingly important and multi‐faceted area of research and software development. Particularly through provision via mobile devices, e‐services can potentially reach and improve the lives of millions of people living in marginalised areas. The efforts of many governments in sub‐Saharan Africa are frustrated by poor tele-communication infrastructure, lack of skills and unsustainable models of intervention. In this paper we describe the holistic solution offered by the TeleWeaver platform. The novel approach to the development of the software, the strong sense of social responsibility of the developers and the collaborative spirit that shaped the ecosystem of which Tele-Weaver is part, warrants the adoption of an innovative approach to its marketing and implementation. On the one hand, the project needs to provide returns on investment and generate profit for the key stake-holders (ie government at the local and national level, academia, indus-try and socio‐-entrepreneurs in the target community). On the other, it must benefit all members of the marginalised communities it is intended to serve as well as the global community of software developers. Tele-Weaver was developed in close collaboration with the community of Dwesa, a rural area on the Wild Cost of the Transkei regions in eastern South Africa.
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- Authors: Dalvit, Lorenzo , Gumbo, Sibukelo , Ntshinga, Lindikaya , Terzoli, Alfredo , Hansen, Susan
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/431317 , vital:72763 , https://www.academic-bookshop.com/ourshop/prod_2659103-ECEG-2013-13th-European-Conference-on-eGovernment-Como-Italy-PRINT-version.html
- Description: Information and Communication Technologies for Development (ICT4D) is becoming an increasingly important and multi‐faceted area of research and software development. Particularly through provision via mobile devices, e‐services can potentially reach and improve the lives of millions of people living in marginalised areas. The efforts of many governments in sub‐Saharan Africa are frustrated by poor tele-communication infrastructure, lack of skills and unsustainable models of intervention. In this paper we describe the holistic solution offered by the TeleWeaver platform. The novel approach to the development of the software, the strong sense of social responsibility of the developers and the collaborative spirit that shaped the ecosystem of which Tele-Weaver is part, warrants the adoption of an innovative approach to its marketing and implementation. On the one hand, the project needs to provide returns on investment and generate profit for the key stake-holders (ie government at the local and national level, academia, indus-try and socio‐-entrepreneurs in the target community). On the other, it must benefit all members of the marginalised communities it is intended to serve as well as the global community of software developers. Tele-Weaver was developed in close collaboration with the community of Dwesa, a rural area on the Wild Cost of the Transkei regions in eastern South Africa.
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