Playing with the forest: Invasive alien plants, policy and protected areas in India
- Kannan, Ramesh, Shackleton, Charlie M, Shaanker, Ramanan U
- Authors: Kannan, Ramesh , Shackleton, Charlie M , Shaanker, Ramanan U
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/182334 , vital:43821 , xlink:href="https://www.jstor.org/stable/24092395"
- Description: Protected areas (PAs) are inviolate and invaluable landscapes that promote the in situ conservation of endangered, threatened and rare species. Accordingly, and in keeping with this definition, PA managers ensure that PAs are free from fire, poaching, grazing, non-timber forest products collection, mining, etc. In India, following the Indian Wildlife (Protection) Act (1972), there are today 102 and 515 National Parks and Wildlife Sanctuaries respectively. Many of these have in recent decades been heavily threatened by the spread of invasive alien plant species, notable among them being Lantana and Eupatorium. These species may have usurped as yet unestimated number of native plants and fauna, besides depressing the reproduction of native plant species. In fact, it is realized that the threat to biodiversity by invasive alien species (IAS) may only be second to that of fragmentation. Yet there seems to be no major attempts to eradicate, contain or manage IAS in PAs. Ironically, the justification for the lack of action lies in the definition of PAs - that they need to be kept inviolate and therefore above any active intervention. In this article we bring home this serious contradiction in the approach to management of PAs in India and discuss the philosophical origins of this practice. We argue that if we are to protect our PAs from the serious scourge of invasive species, we would have to relook at the policy governing PA management and revise it to be more inclusive than exclusive.
- Full Text:
- Date Issued: 2013
- Authors: Kannan, Ramesh , Shackleton, Charlie M , Shaanker, Ramanan U
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/182334 , vital:43821 , xlink:href="https://www.jstor.org/stable/24092395"
- Description: Protected areas (PAs) are inviolate and invaluable landscapes that promote the in situ conservation of endangered, threatened and rare species. Accordingly, and in keeping with this definition, PA managers ensure that PAs are free from fire, poaching, grazing, non-timber forest products collection, mining, etc. In India, following the Indian Wildlife (Protection) Act (1972), there are today 102 and 515 National Parks and Wildlife Sanctuaries respectively. Many of these have in recent decades been heavily threatened by the spread of invasive alien plant species, notable among them being Lantana and Eupatorium. These species may have usurped as yet unestimated number of native plants and fauna, besides depressing the reproduction of native plant species. In fact, it is realized that the threat to biodiversity by invasive alien species (IAS) may only be second to that of fragmentation. Yet there seems to be no major attempts to eradicate, contain or manage IAS in PAs. Ironically, the justification for the lack of action lies in the definition of PAs - that they need to be kept inviolate and therefore above any active intervention. In this article we bring home this serious contradiction in the approach to management of PAs in India and discuss the philosophical origins of this practice. We argue that if we are to protect our PAs from the serious scourge of invasive species, we would have to relook at the policy governing PA management and revise it to be more inclusive than exclusive.
- Full Text:
- Date Issued: 2013
Playing broken telephone with student feedback: the possibilities and issues of transformation within a South African case of a collegial rationality model of evaluation
- Authors: Belluigi, Dina Z
- Date: 2013
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/66943 , vital:29003 , https://doi.org/10.1016/B978-1-84334-655-5.50001-5
- Description: publisher version , Drawing on the case of a small South African university which espouses a social justice approach to transformation, this chapter considers the possibilities and challenges created for student feedback within an institutional context that gives the individual lecturer a large degree of autonomy in evaluation. The chapter looks at some of the dominant perceptions of student feedback in addition to how it is collected and utilised, by referring to the institution’s policies and guideline documents; institutional research conducted with course coordinators; responses elicited from 40 lecturers on the issues outlined in this chapter; the author’s own reflections as a staff developer in the institution; and specific examples of good practice from lecturers situated within social science disciplines. The emerging concerns which structured this discussion are: the impact of student feedback on improving quality; enabling student voice; increasing student ownership; and the educational value of evaluation processes.
- Full Text: false
- Date Issued: 2013
- Authors: Belluigi, Dina Z
- Date: 2013
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/66943 , vital:29003 , https://doi.org/10.1016/B978-1-84334-655-5.50001-5
- Description: publisher version , Drawing on the case of a small South African university which espouses a social justice approach to transformation, this chapter considers the possibilities and challenges created for student feedback within an institutional context that gives the individual lecturer a large degree of autonomy in evaluation. The chapter looks at some of the dominant perceptions of student feedback in addition to how it is collected and utilised, by referring to the institution’s policies and guideline documents; institutional research conducted with course coordinators; responses elicited from 40 lecturers on the issues outlined in this chapter; the author’s own reflections as a staff developer in the institution; and specific examples of good practice from lecturers situated within social science disciplines. The emerging concerns which structured this discussion are: the impact of student feedback on improving quality; enabling student voice; increasing student ownership; and the educational value of evaluation processes.
- Full Text: false
- Date Issued: 2013
Place of Knowledge
- Rhodes University Development & Alumni Relations Division
- Authors: Rhodes University Development & Alumni Relations Division
- Date: 2013
- Language: English
- Type: text
- Identifier: vital:7950 , http://hdl.handle.net/10962/d1013054
- Description: [From Introduction] How it all began. The dream of the new library began with the late Margaret Kenyon. Initially joining the library staff in 1982 as a cataloguer. she was appointed to the position of University Librarian in April 2001. It was through her initiative as Head of Cataloguing that Rhodes became the first library in South Africa to create hyperlinks on OPAC records to material also available in electronic format. She was an initiator of the Rhodes eResearch Repository (ReRR) which was among the first open access institutional repositories in South Africa. She also started the LibQUAL survey and while the old library scored well on service and information, it failed dismally on place. The pattern of student use had changed and there was no space for discussion areas to accommodate peer learning and group work. With student numbers having grown to 6200 and academic staff to 300, the library could only seat 10 percent of its users. It was Mrs Kenyon who contacted Geoff de Wet, Architect and Director of the Physical Planning Unit at UCT, and arranged for him to visit the Rhodes Library. It was a great tragedy that she did not see the seed that she had planted come to fruition. The ever changing demands for versatile workspaces that are responsive to evolving patterns of teaching, learning and research require a completely new approach to university libraries. We are thrilled to have seen the Rhodes University Library evolve from humble beginnings in a single room in the old Drostdy building into its grand position as a highly technological facility today. , Indawo Yolwazi (place of knowledge) in pursuit of excellence in teaching, research and community engagement.
- Full Text:
- Date Issued: 2013
- Authors: Rhodes University Development & Alumni Relations Division
- Date: 2013
- Language: English
- Type: text
- Identifier: vital:7950 , http://hdl.handle.net/10962/d1013054
- Description: [From Introduction] How it all began. The dream of the new library began with the late Margaret Kenyon. Initially joining the library staff in 1982 as a cataloguer. she was appointed to the position of University Librarian in April 2001. It was through her initiative as Head of Cataloguing that Rhodes became the first library in South Africa to create hyperlinks on OPAC records to material also available in electronic format. She was an initiator of the Rhodes eResearch Repository (ReRR) which was among the first open access institutional repositories in South Africa. She also started the LibQUAL survey and while the old library scored well on service and information, it failed dismally on place. The pattern of student use had changed and there was no space for discussion areas to accommodate peer learning and group work. With student numbers having grown to 6200 and academic staff to 300, the library could only seat 10 percent of its users. It was Mrs Kenyon who contacted Geoff de Wet, Architect and Director of the Physical Planning Unit at UCT, and arranged for him to visit the Rhodes Library. It was a great tragedy that she did not see the seed that she had planted come to fruition. The ever changing demands for versatile workspaces that are responsive to evolving patterns of teaching, learning and research require a completely new approach to university libraries. We are thrilled to have seen the Rhodes University Library evolve from humble beginnings in a single room in the old Drostdy building into its grand position as a highly technological facility today. , Indawo Yolwazi (place of knowledge) in pursuit of excellence in teaching, research and community engagement.
- Full Text:
- Date Issued: 2013
Physicochemical properties of zinc monoamino phthalocyanine conjugated to folic acid and single walled carbon nanotubes
- Ogbodu, Racheal O, Antunes, Edith M, Nyokong, Tebello
- Authors: Ogbodu, Racheal O , Antunes, Edith M , Nyokong, Tebello
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/241761 , vital:50967 , xlink:href="https://doi.org/10.1016/j.poly.2013.05.025"
- Description: This study reports on the photophysical and photochemical behavior of the conjugates formed by covalent and non-covalent bonding between zinc monoamino phthalocyanine (ZnMAPc) and either single walled carbon nanotubes (SWCNTs) or folic acid (FA). The conjugates were characterized using FTIR, X-ray powder diffractometry, thermogravimetric analyses, transmission electron microscopy and Raman spectroscopy. 1H NMR and mass spectroscopies were only employed for ZnMAPc–FA conjugate. There was a slight increase in the triplet and singlet oxygen quantum yields on conjugating ZnMAPc to SWCNTs (or FA), while a decrease in the photophysical and photochemical parameters were observed upon adsorption of the ZnMAPc–FA conjugate to SWCNTs.
- Full Text:
- Date Issued: 2013
- Authors: Ogbodu, Racheal O , Antunes, Edith M , Nyokong, Tebello
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/241761 , vital:50967 , xlink:href="https://doi.org/10.1016/j.poly.2013.05.025"
- Description: This study reports on the photophysical and photochemical behavior of the conjugates formed by covalent and non-covalent bonding between zinc monoamino phthalocyanine (ZnMAPc) and either single walled carbon nanotubes (SWCNTs) or folic acid (FA). The conjugates were characterized using FTIR, X-ray powder diffractometry, thermogravimetric analyses, transmission electron microscopy and Raman spectroscopy. 1H NMR and mass spectroscopies were only employed for ZnMAPc–FA conjugate. There was a slight increase in the triplet and singlet oxygen quantum yields on conjugating ZnMAPc to SWCNTs (or FA), while a decrease in the photophysical and photochemical parameters were observed upon adsorption of the ZnMAPc–FA conjugate to SWCNTs.
- Full Text:
- Date Issued: 2013
Physicochemical properties of a zinc phthalocyanine–pyrene conjugate adsorbed onto single walled carbon nanotubes
- Ogbodu, Racheal O, Antunes, Edith M, Nyokong, Tebello
- Authors: Ogbodu, Racheal O , Antunes, Edith M , Nyokong, Tebello
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/242314 , vital:51029 , xlink:href="https://doi.org/10.1039/C3DT50335F"
- Description: A conjugate between zinc monoamino phthalocyanine (ZnMAPc) and pyrene (Py) represented as ZnMAPc–Py (complex 3) was synthesized and characterized by various spectroscopic techniques and by elemental analysis. This manuscript also reports on the photochemical and photophysical properties of 3. This new compound exhibited higher triplet, fluorescence and singlet oxygen quantum yields in comparison to the phthalocyanine alone, hence showing the advantages of attaching pyrene to the Pc without breaking the conjugation. We also observed a decrease in photophysical parameters upon adsorbing the ZnMAPc–Py complex onto single walled carbon nanotubes (SWCNT). However, ZnMAPc–Py still generated some singlet oxygen when adsorbed onto SWCNT.
- Full Text:
- Date Issued: 2013
- Authors: Ogbodu, Racheal O , Antunes, Edith M , Nyokong, Tebello
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/242314 , vital:51029 , xlink:href="https://doi.org/10.1039/C3DT50335F"
- Description: A conjugate between zinc monoamino phthalocyanine (ZnMAPc) and pyrene (Py) represented as ZnMAPc–Py (complex 3) was synthesized and characterized by various spectroscopic techniques and by elemental analysis. This manuscript also reports on the photochemical and photophysical properties of 3. This new compound exhibited higher triplet, fluorescence and singlet oxygen quantum yields in comparison to the phthalocyanine alone, hence showing the advantages of attaching pyrene to the Pc without breaking the conjugation. We also observed a decrease in photophysical parameters upon adsorbing the ZnMAPc–Py complex onto single walled carbon nanotubes (SWCNT). However, ZnMAPc–Py still generated some singlet oxygen when adsorbed onto SWCNT.
- Full Text:
- Date Issued: 2013
Photophysical and photochemical properties of a novel thiol terminated low symmetry zinc phthalocyanine complex and its gold nanoparticles conjugate
- Mthethwa, Thandekile P, Durmus, Mahmut, Nyokong, Tebello
- Authors: Mthethwa, Thandekile P , Durmus, Mahmut , Nyokong, Tebello
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/231474 , vital:49891 , xlink:href="https://doi.org/10.1039/C3DT32698E"
- Description: A novel thiol functionalized zinc phthalocyanine complex (ZnPcSH) is reported in this work. This complex was conjugated to gold nanoparticles. The photophysical and photochemical properties of the complex and the conjugate were investigated. Upon conjugation a blue shift was observed from the UV-Vis spectra. The conjugate showed a decrease in the fluorescence quantum yield and lifetime. An increase in the triplet quantum yield and lifetime was observed for ZnPcSH following conjugation to gold nanoparticles. Both ZnPcSH and its conjugate with gold nanoparticles showed high singlet oxygen quantum yields with the conjugate being higher than the Pc alone.
- Full Text:
- Date Issued: 2013
- Authors: Mthethwa, Thandekile P , Durmus, Mahmut , Nyokong, Tebello
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/231474 , vital:49891 , xlink:href="https://doi.org/10.1039/C3DT32698E"
- Description: A novel thiol functionalized zinc phthalocyanine complex (ZnPcSH) is reported in this work. This complex was conjugated to gold nanoparticles. The photophysical and photochemical properties of the complex and the conjugate were investigated. Upon conjugation a blue shift was observed from the UV-Vis spectra. The conjugate showed a decrease in the fluorescence quantum yield and lifetime. An increase in the triplet quantum yield and lifetime was observed for ZnPcSH following conjugation to gold nanoparticles. Both ZnPcSH and its conjugate with gold nanoparticles showed high singlet oxygen quantum yields with the conjugate being higher than the Pc alone.
- Full Text:
- Date Issued: 2013
Photodegradation of Orange-G using zinc octacarboxyphthalocyanine supported on Fe3O4 nanoparticles
- Modisha, Phillimon, Nyokong, Tebello, Antunes, Edith M
- Authors: Modisha, Phillimon , Nyokong, Tebello , Antunes, Edith M
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/241653 , vital:50958 , xlink:href="https://doi.org/10.1016/j.molcata.2013.09.030"
- Description: Zinc octacarboxy phthalocyanine (ZnOCPc) was covalently immobilized on the surface of magnetite nanoparticles (MNPs) for the photocatalytic degradation of Orange G (OG) under visible light irradiation. It is noteworthy that the catalyst can be easily recovered using an external magnet and that it is reusable. The ZnOCPc remained bound to the MNP surface even after 25 min of photolysis as confirmed by the FT-IR and X-ray diffraction spectra. Kinetic analysis shows that the photodegradation rates of OG can be approximated to be pseudo-first order, according to the Langmuir–Hinshelwood kinetics model.
- Full Text:
- Date Issued: 2013
- Authors: Modisha, Phillimon , Nyokong, Tebello , Antunes, Edith M
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/241653 , vital:50958 , xlink:href="https://doi.org/10.1016/j.molcata.2013.09.030"
- Description: Zinc octacarboxy phthalocyanine (ZnOCPc) was covalently immobilized on the surface of magnetite nanoparticles (MNPs) for the photocatalytic degradation of Orange G (OG) under visible light irradiation. It is noteworthy that the catalyst can be easily recovered using an external magnet and that it is reusable. The ZnOCPc remained bound to the MNP surface even after 25 min of photolysis as confirmed by the FT-IR and X-ray diffraction spectra. Kinetic analysis shows that the photodegradation rates of OG can be approximated to be pseudo-first order, according to the Langmuir–Hinshelwood kinetics model.
- Full Text:
- Date Issued: 2013
Persistence and virulence of promising entomopathogenic fungal isolates for use in citrus orchards in South Africa
- Coombes, Candice A, Hill, Martin P, Moore, Sean D, Dames, Joanna F, Fullard, T
- Authors: Coombes, Candice A , Hill, Martin P , Moore, Sean D , Dames, Joanna F , Fullard, T
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/416893 , vital:71394 , xlink:href="https://doi.org/10.1080/09583157.2013.819489"
- Description: Thaumatotibia leucotreta (Meyrick) (1912) (Lepidoptera: Tortricidae) is a key economic pest of citrus in South Africa. Although a variety of control options are available, none currently registered target the soil-dwelling life stages of the pest. Three fungal isolates, two Metarhizium anisopliae sensu lato Metschnikoff (Sorokin) isolates (G 11 3 L6 and FCM Ar 23 B3) and one Beauveria bassiana sensu lato Balsamo (Vuillemin) isolate (G Ar 17 B3) have been identified as showing the greatest potential against T. leucotreta soil-dwelling life stages. Since environmental persistence is an important factor in the success of entomopathogenic fungi against soil pests, the isolates, along with two commercial isolates (B. bassiana Eco-Bb® and M. anisopliae ICIPE 69), were subjected to a six-month field persistence trial. Every month after burial of the fungal isolates, inside net bags, in orchard soil, the number of colony forming units (CFUs) per gram of soil was measured and the viability of the conidia was assessed using bioassays. All isolates investigated were capable of persisting in the soil for the duration of the trial period and in addition, were capable of initiating infection in T. leucotreta late fifth instar larvae and subsequent pupae. However, with the exception of the commercial isolates which showed some correlation, no correlation was found between the number of CFUs recorded and percentage T. leucotreta mycosis. Persistence of entomopathogenic fungi in the field is affected by a series of factors, and although the effect of these factors was not measured, the data have provided preliminary evidence towards the persistence capability of these candidate biopesticides against T. leucotreta.
- Full Text:
- Date Issued: 2013
- Authors: Coombes, Candice A , Hill, Martin P , Moore, Sean D , Dames, Joanna F , Fullard, T
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/416893 , vital:71394 , xlink:href="https://doi.org/10.1080/09583157.2013.819489"
- Description: Thaumatotibia leucotreta (Meyrick) (1912) (Lepidoptera: Tortricidae) is a key economic pest of citrus in South Africa. Although a variety of control options are available, none currently registered target the soil-dwelling life stages of the pest. Three fungal isolates, two Metarhizium anisopliae sensu lato Metschnikoff (Sorokin) isolates (G 11 3 L6 and FCM Ar 23 B3) and one Beauveria bassiana sensu lato Balsamo (Vuillemin) isolate (G Ar 17 B3) have been identified as showing the greatest potential against T. leucotreta soil-dwelling life stages. Since environmental persistence is an important factor in the success of entomopathogenic fungi against soil pests, the isolates, along with two commercial isolates (B. bassiana Eco-Bb® and M. anisopliae ICIPE 69), were subjected to a six-month field persistence trial. Every month after burial of the fungal isolates, inside net bags, in orchard soil, the number of colony forming units (CFUs) per gram of soil was measured and the viability of the conidia was assessed using bioassays. All isolates investigated were capable of persisting in the soil for the duration of the trial period and in addition, were capable of initiating infection in T. leucotreta late fifth instar larvae and subsequent pupae. However, with the exception of the commercial isolates which showed some correlation, no correlation was found between the number of CFUs recorded and percentage T. leucotreta mycosis. Persistence of entomopathogenic fungi in the field is affected by a series of factors, and although the effect of these factors was not measured, the data have provided preliminary evidence towards the persistence capability of these candidate biopesticides against T. leucotreta.
- Full Text:
- Date Issued: 2013
Perceptions of fortune and misfortune in older South African households: social assistance and the ‘Good Life’
- Moller, Valerie, Radloff, Sarah E
- Authors: Moller, Valerie , Radloff, Sarah E
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/67165 , vital:29043 , https://doi.org/10.1007/s11205-012-0026-8
- Description: publisher version , It is commonly assumed that better living standards will boost subjective well-being. The post-apartheid South African government subscribes to this idea; its social policies aim to provide ‘a better life for all’. Since the coming of democracy in 1994, the state has built over 3 million houses and supplied electricity and clean water to poor households. By 2009, an estimated 43 % of households were beneficiaries of social grants. The question is whether this investment in services and social assistance translates into higher well-being of citizens. It is argued that older people’s experience of positive change in their life circumstances can be taken as a litmus test of progress in society. The paper reports results of a sample survey conducted in 2009 that inquired into the living circumstances and well-being of 1,000 older low-income households in two provinces linked by a labour migration route. Older households were defined as ones with a member 55 years and older. The sample was drawn among three approximately equal-sized subgroups: Rural black households in the former ‘homelands’ of the Eastern Cape Province, and black and coloured households in Cape Town in the Western Cape Province. The majority of the households in the survey had been interviewed in an earlier survey conducted in late 2002. Both material and non-material changes had occurred in the household situation over the 6-year period between 2002 and 2009. Access to housing and infrastructure had improved but financial difficulties and debts continued to plague many of the surveyed households. Rural black households appeared to be worst off among the three categories of older households with the lowest level of living; coloured households best situated with the highest level of living. Urban black households, many of whom were immigrants to Cape Town, appeared to have experienced the greatest fluctuations in their material circumstances between 2002 and 2009 and a mix of fortune and misfortune. Results indicated that social grants, which provided a modicum of financial security and peace of mind, made the crucial difference between fortune and misfortune for vulnerable households. Securing a social pension and other grants appeared to be the main route to good fortune for the rural households in the study. Households in Cape Town required wage income in addition to grant income to get by in the city. This mix of income sources diluted urban households’ dependence on social assistance. Regression model results suggest that income and financial security play a significantly more important role in boosting the well-being of low-income older households than access to services. Pooling of income, a common practice in pensioner households, contributed significantly to household satisfaction.
- Full Text: false
- Date Issued: 2013
- Authors: Moller, Valerie , Radloff, Sarah E
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/67165 , vital:29043 , https://doi.org/10.1007/s11205-012-0026-8
- Description: publisher version , It is commonly assumed that better living standards will boost subjective well-being. The post-apartheid South African government subscribes to this idea; its social policies aim to provide ‘a better life for all’. Since the coming of democracy in 1994, the state has built over 3 million houses and supplied electricity and clean water to poor households. By 2009, an estimated 43 % of households were beneficiaries of social grants. The question is whether this investment in services and social assistance translates into higher well-being of citizens. It is argued that older people’s experience of positive change in their life circumstances can be taken as a litmus test of progress in society. The paper reports results of a sample survey conducted in 2009 that inquired into the living circumstances and well-being of 1,000 older low-income households in two provinces linked by a labour migration route. Older households were defined as ones with a member 55 years and older. The sample was drawn among three approximately equal-sized subgroups: Rural black households in the former ‘homelands’ of the Eastern Cape Province, and black and coloured households in Cape Town in the Western Cape Province. The majority of the households in the survey had been interviewed in an earlier survey conducted in late 2002. Both material and non-material changes had occurred in the household situation over the 6-year period between 2002 and 2009. Access to housing and infrastructure had improved but financial difficulties and debts continued to plague many of the surveyed households. Rural black households appeared to be worst off among the three categories of older households with the lowest level of living; coloured households best situated with the highest level of living. Urban black households, many of whom were immigrants to Cape Town, appeared to have experienced the greatest fluctuations in their material circumstances between 2002 and 2009 and a mix of fortune and misfortune. Results indicated that social grants, which provided a modicum of financial security and peace of mind, made the crucial difference between fortune and misfortune for vulnerable households. Securing a social pension and other grants appeared to be the main route to good fortune for the rural households in the study. Households in Cape Town required wage income in addition to grant income to get by in the city. This mix of income sources diluted urban households’ dependence on social assistance. Regression model results suggest that income and financial security play a significantly more important role in boosting the well-being of low-income older households than access to services. Pooling of income, a common practice in pensioner households, contributed significantly to household satisfaction.
- Full Text: false
- Date Issued: 2013
Perceptions and use of public green space is influenced by its relative abundance in two small towns in South Africa
- Shackleton, Charlie M, Blair, Andrew
- Authors: Shackleton, Charlie M , Blair, Andrew
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/181026 , vital:43688 , xlink:href="https://doi.org/10.1016/j.landurbplan.2013.01.011"
- Description: The challenges in planning and maintaining urban public green spaces in poor towns of the developing world differ markedly from those of the developed world. This paper reports on residents’ perceptions, use and willingness to get involved in urban public green space (PGS) issues in two poor towns in South Africa which differed markedly in the amount of PGS. The disparities in PGS between the two towns were also replicated in different suburbs within the two towns. We hypothesised that levels of dissatisfaction would be highest in those suburbs and the town with the least PGS. The results indicated that the distance from residents’ homesteads to the nearest PGS was similar across towns and suburbs. Most residents felt that having accessible PGS was important, and the majority agreed that there was insufficient PGS in their respective town and suburb, and that the local municipality did not do enough in providing PGS or maintaining what there was. The level of dissatisfaction with the amount and condition of PGS was generally highest in the suburbs and town with the least PGS. Many felt that the municipality had insufficient commitment and funds to adequately maintain PGS, and consequently the willingness of residents to get involved through either a commitment of time or funds was high. The more affluent town and suburbs were willing to pay more than the poorer ones, and the poorer ones were willing to provide more time than the more affluent ones.
- Full Text:
- Date Issued: 2013
- Authors: Shackleton, Charlie M , Blair, Andrew
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/181026 , vital:43688 , xlink:href="https://doi.org/10.1016/j.landurbplan.2013.01.011"
- Description: The challenges in planning and maintaining urban public green spaces in poor towns of the developing world differ markedly from those of the developed world. This paper reports on residents’ perceptions, use and willingness to get involved in urban public green space (PGS) issues in two poor towns in South Africa which differed markedly in the amount of PGS. The disparities in PGS between the two towns were also replicated in different suburbs within the two towns. We hypothesised that levels of dissatisfaction would be highest in those suburbs and the town with the least PGS. The results indicated that the distance from residents’ homesteads to the nearest PGS was similar across towns and suburbs. Most residents felt that having accessible PGS was important, and the majority agreed that there was insufficient PGS in their respective town and suburb, and that the local municipality did not do enough in providing PGS or maintaining what there was. The level of dissatisfaction with the amount and condition of PGS was generally highest in the suburbs and town with the least PGS. Many felt that the municipality had insufficient commitment and funds to adequately maintain PGS, and consequently the willingness of residents to get involved through either a commitment of time or funds was high. The more affluent town and suburbs were willing to pay more than the poorer ones, and the poorer ones were willing to provide more time than the more affluent ones.
- Full Text:
- Date Issued: 2013
Oxovanadium (IV)-containing poly (styrene-co-4′-ethenyl-2-hydroxyphenylimidazole) electrospun nanofibers for the catalytic oxidation of thioanisole
- Walmsley, Ryan S, Litwinski, Christian, Antunes, Edith M, Hlangothi, Percy, Hosten, Eric, McCleland, Cedric, Nyokong, Tebello, Torto, Nelson, Tshentu, Zenixole R
- Authors: Walmsley, Ryan S , Litwinski, Christian , Antunes, Edith M , Hlangothi, Percy , Hosten, Eric , McCleland, Cedric , Nyokong, Tebello , Torto, Nelson , Tshentu, Zenixole R
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/241665 , vital:50959 , xlink:href="https://doi.org/10.1016/j.molcata.2013.07.018"
- Description: The catalytic fibers have been fabricated by the electrospinning of a copolymer of styrene and 2-(2′-hydroxy-4′-ethenylphenyl)imidazole {p(ST-co-VPIM)} followed by a reaction with a methanolic vanadyl solution to afford the oxovanadium(IV)-containing poly(styrene-co-4′-ethenyl-2-hydroxyphenylimidazole) fibers {p(ST-co-VPIM)-VO fibers}. The relationship between polymer concentration and fiber diameter was investigated, and at high concentration (20 wt%) the fibers were quite large (average diameter of 3.8 μm) but as the concentration was reduced fibers of much lower diameter were produced (0.6 μm using 8 wt%). The BET surface area for p(ST-co-VPIM) fibers (0.6 μm diameter) was 47.9 m2 g−1 and functionalization of p(ST-co-VPIM) with vanadyl resulted in an increase in surface area to 60.7 m2 g−1 for p(ST-co-VPIM)-VO. The presence of vanadyl was confirmed by XPS and EPR. The EPR spectral analyses depicted complex speciation of vanadium within these polymer supports. These catalytic fibers were applied under batch and continuous flow conditions for the catalytic oxidation of thioanisole using hydrogen peroxide. The continuous flow method gave excellent and constant conversion throughout the 10 h period studied. The leaching of vanadium from the fiber support was 4% over the 10 h period indicating a significant stability of the material.
- Full Text:
- Date Issued: 2013
- Authors: Walmsley, Ryan S , Litwinski, Christian , Antunes, Edith M , Hlangothi, Percy , Hosten, Eric , McCleland, Cedric , Nyokong, Tebello , Torto, Nelson , Tshentu, Zenixole R
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/241665 , vital:50959 , xlink:href="https://doi.org/10.1016/j.molcata.2013.07.018"
- Description: The catalytic fibers have been fabricated by the electrospinning of a copolymer of styrene and 2-(2′-hydroxy-4′-ethenylphenyl)imidazole {p(ST-co-VPIM)} followed by a reaction with a methanolic vanadyl solution to afford the oxovanadium(IV)-containing poly(styrene-co-4′-ethenyl-2-hydroxyphenylimidazole) fibers {p(ST-co-VPIM)-VO fibers}. The relationship between polymer concentration and fiber diameter was investigated, and at high concentration (20 wt%) the fibers were quite large (average diameter of 3.8 μm) but as the concentration was reduced fibers of much lower diameter were produced (0.6 μm using 8 wt%). The BET surface area for p(ST-co-VPIM) fibers (0.6 μm diameter) was 47.9 m2 g−1 and functionalization of p(ST-co-VPIM) with vanadyl resulted in an increase in surface area to 60.7 m2 g−1 for p(ST-co-VPIM)-VO. The presence of vanadyl was confirmed by XPS and EPR. The EPR spectral analyses depicted complex speciation of vanadium within these polymer supports. These catalytic fibers were applied under batch and continuous flow conditions for the catalytic oxidation of thioanisole using hydrogen peroxide. The continuous flow method gave excellent and constant conversion throughout the 10 h period studied. The leaching of vanadium from the fiber support was 4% over the 10 h period indicating a significant stability of the material.
- Full Text:
- Date Issued: 2013
Overcrowding of false codling moth, Thaumatotibia leucotreta (Meyrick) leads to the isolation of five new Cryptophlebia leucotreta granulovirus (CrleGV-SA) isolates
- Opoku-Debrah, John K, Hill, Martin P, Knox, Caroline, Moore, Sean D
- Authors: Opoku-Debrah, John K , Hill, Martin P , Knox, Caroline , Moore, Sean D
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/419360 , vital:71637 , xlink:href="https://doi.org/10.1016/j.jip.2012.12.008"
- Description: False codling moth, Thaumatotibia leucotreta (Meyrick) is a serious pest of economic importance to the South African fruit industry. As part of sustainable efforts to control this pest, biological control options that involve the application of baculovirus-based biopesticides such as Cryptogran and Cryptex (both formulated with a South African isolate of Cryptophlebia leucotreta granulovirus, CrleGV-SA) are popularly used by farmers. In order to safeguard the integrity of these biopesticides as well as protect against any future development of resistance in the host, we conducted a study to bioprospect for additional CrleGV isolates as alternatives to existing ones. Using overcrowding as an induction method for latent infection, we recovered five new CrleGV isolates (CrleGV-SA Ado, CrleGV-SA Mbl, CrleGV-SA Cit, CrleGV-SA MixC and CrleGV-SA Nels). Single restriction endonuclease (REN) analysis of viral genomic DNA extracted from purified occlusion bodies showed that isolates differed in their DNA profiles. Partial sequencing of granulin and egt genes from the different isolates and multiple alignments of nucleotide sequences revealed the presence of single nucleotide polymorphisms (SNPs), some of which resulted in amino acid substitutions in the protein sequence. Based on these findings as well as comparisons with other documented CrleGV isolates, we propose two phylogenetic groups for CrleGV-SA isolates recovered in this study.
- Full Text:
- Date Issued: 2013
- Authors: Opoku-Debrah, John K , Hill, Martin P , Knox, Caroline , Moore, Sean D
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/419360 , vital:71637 , xlink:href="https://doi.org/10.1016/j.jip.2012.12.008"
- Description: False codling moth, Thaumatotibia leucotreta (Meyrick) is a serious pest of economic importance to the South African fruit industry. As part of sustainable efforts to control this pest, biological control options that involve the application of baculovirus-based biopesticides such as Cryptogran and Cryptex (both formulated with a South African isolate of Cryptophlebia leucotreta granulovirus, CrleGV-SA) are popularly used by farmers. In order to safeguard the integrity of these biopesticides as well as protect against any future development of resistance in the host, we conducted a study to bioprospect for additional CrleGV isolates as alternatives to existing ones. Using overcrowding as an induction method for latent infection, we recovered five new CrleGV isolates (CrleGV-SA Ado, CrleGV-SA Mbl, CrleGV-SA Cit, CrleGV-SA MixC and CrleGV-SA Nels). Single restriction endonuclease (REN) analysis of viral genomic DNA extracted from purified occlusion bodies showed that isolates differed in their DNA profiles. Partial sequencing of granulin and egt genes from the different isolates and multiple alignments of nucleotide sequences revealed the presence of single nucleotide polymorphisms (SNPs), some of which resulted in amino acid substitutions in the protein sequence. Based on these findings as well as comparisons with other documented CrleGV isolates, we propose two phylogenetic groups for CrleGV-SA isolates recovered in this study.
- Full Text:
- Date Issued: 2013
Oral literature in Africa
- Authors: Kaschula, Russell H
- Date: 2013
- Subjects: Folk literature -- Study and teaching -- Africa , Oral tradition -- Africa , Folklore and education -- Africa , Books -- Africa -- Reviews
- Language: English
- Type: article , text
- Identifier: http://hdl.handle.net/10962/59355 , vital:27563 , https://doi.org/10.1080/13696815.2012.756804
- Description: I have in my possession a first edition, hard copy of Ruth Finnegan’s quintessential work, Oral Literature in Africa. It has a yellow cover, preserved by a plastic sheathe, it is a little frayed around the edges and has that old, musty library smell about it. I love and treasure this book. It is dedicated by Professor Finnegan ‘[t]o all my teachers’. Professor Finnegan is indeed one of my teachers. I properly met Ruth Finnegan at the second International Society for Oral Literature (ISOLA) conference in 1998, which I hosted at the University of Cape Town. She gave a keynote address which included reference to her seminal work and the future of oral literary studies. She has continually influenced our work as researchers following in her footsteps: Isidore Okpewho, Harold Scheub, Abiola Irele, Graham Furniss, Elizabeth Gunner, Karin Barber, Isobel Hofmeyr, John Foley, Olayibi Yai, Edgard Sienaert, Brian Street, Noverino Canonici, Mark Turin, Daniela Merolla, Jan Jansen, Jeff Opland, and many others; some younger, some older, some living, some departed, scholars influenced by this great and humble intellectual and her body of work.
- Full Text:
- Date Issued: 2013
- Authors: Kaschula, Russell H
- Date: 2013
- Subjects: Folk literature -- Study and teaching -- Africa , Oral tradition -- Africa , Folklore and education -- Africa , Books -- Africa -- Reviews
- Language: English
- Type: article , text
- Identifier: http://hdl.handle.net/10962/59355 , vital:27563 , https://doi.org/10.1080/13696815.2012.756804
- Description: I have in my possession a first edition, hard copy of Ruth Finnegan’s quintessential work, Oral Literature in Africa. It has a yellow cover, preserved by a plastic sheathe, it is a little frayed around the edges and has that old, musty library smell about it. I love and treasure this book. It is dedicated by Professor Finnegan ‘[t]o all my teachers’. Professor Finnegan is indeed one of my teachers. I properly met Ruth Finnegan at the second International Society for Oral Literature (ISOLA) conference in 1998, which I hosted at the University of Cape Town. She gave a keynote address which included reference to her seminal work and the future of oral literary studies. She has continually influenced our work as researchers following in her footsteps: Isidore Okpewho, Harold Scheub, Abiola Irele, Graham Furniss, Elizabeth Gunner, Karin Barber, Isobel Hofmeyr, John Foley, Olayibi Yai, Edgard Sienaert, Brian Street, Noverino Canonici, Mark Turin, Daniela Merolla, Jan Jansen, Jeff Opland, and many others; some younger, some older, some living, some departed, scholars influenced by this great and humble intellectual and her body of work.
- Full Text:
- Date Issued: 2013
Optical limiting analysis of phthalocyanines in polymer thin films
- Britton, Jonathan, Litwinski, Christian, Antunes, Edith M, Durmus, Mahmut, Chaukea, Vongani, Nyokong, Tebello
- Authors: Britton, Jonathan , Litwinski, Christian , Antunes, Edith M , Durmus, Mahmut , Chaukea, Vongani , Nyokong, Tebello
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/232488 , vital:49996 , xlink:href="https://doi.org/10.1080/10601325.2013.736269"
- Description: This paper reports on the effect of embedding twelve phthalocyanines containing In, Ga, Zn and Al as central metals in polymer thin films on their optical limiting abilities. This paper also examines the effect of forming a covalent link between zinc tetraamino phthalocyanine (10) and poly (methyl acrylic acid) (PMAA), and Zn (11) or OHAl (12) octacarboxy phthalocyanines with polyethylenimine (PEI). The average film thickness (for phthalocyanines mixed or linked to polymers) of each Pc/Polymer films on glass was 95 μm. The hyperpolarizability of the twelve phthalocyanines was found to be in the range of 10−26 to 10−24 esu.L. This is significantly higher than the hyperpolarizabilities of these phthalocyanines in solution, which ranged from 10−30 to 10−26 esu.L. Degradation studies seem to indicate that placing a phthalocyanine within a polymer thin film may protect it slightly from photo- and thermal degradation.
- Full Text:
- Date Issued: 2013
- Authors: Britton, Jonathan , Litwinski, Christian , Antunes, Edith M , Durmus, Mahmut , Chaukea, Vongani , Nyokong, Tebello
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/232488 , vital:49996 , xlink:href="https://doi.org/10.1080/10601325.2013.736269"
- Description: This paper reports on the effect of embedding twelve phthalocyanines containing In, Ga, Zn and Al as central metals in polymer thin films on their optical limiting abilities. This paper also examines the effect of forming a covalent link between zinc tetraamino phthalocyanine (10) and poly (methyl acrylic acid) (PMAA), and Zn (11) or OHAl (12) octacarboxy phthalocyanines with polyethylenimine (PEI). The average film thickness (for phthalocyanines mixed or linked to polymers) of each Pc/Polymer films on glass was 95 μm. The hyperpolarizability of the twelve phthalocyanines was found to be in the range of 10−26 to 10−24 esu.L. This is significantly higher than the hyperpolarizabilities of these phthalocyanines in solution, which ranged from 10−30 to 10−26 esu.L. Degradation studies seem to indicate that placing a phthalocyanine within a polymer thin film may protect it slightly from photo- and thermal degradation.
- Full Text:
- Date Issued: 2013
Opening up global food trade to developing countries: an evaluation of the World Trade Organisation's agreement on sanitary and phytosanitary measure
- Authors: Nyatsanza, Sharon
- Date: 2013
- Subjects: World Trade Organization , Food contamination , Food handling -- Safety measures
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10353/27413 , vital:67294
- Description: Food safety and consumer protection has been a major concern of regulators since the 12th century. Sanitary and Phytosanitary (SPS) measures were therefore introduced to protect human, animal and plant safety. With the expansion of international trade came the increase in the use of SPS measures. However these increases in the use of SPS measures were accompanied with their misuse for protectionist purposes. SPS measures which had been created for legitimate purposes quickly became significant barriers to trade. The World Trade Organisation (WTO) adopted the WTO Agreement on Sanitary and Phytosanitary Measures (SPS Agreement) as a mechanism to regulate the use of SPS measures and avoid their potential use as protectionist tools. Trade liberalization and market access has been a primary aim of the WTO, therefore in principle the SPS Agreement is supposed to open up global food trade for all countries.Apart from opening up global food trade, another purpose of the SPS Agreement was to protect the developing countries, accommodate their special needs and in turn promote their economic development. Developing countries are heavily dependent on global food trade for their economic development. However developing states can only benefit from global food trade if they comply with SPS standards set in the importing countries. Considering their reliance on the agro – food sector the economic development of developing states is heavily reliant on the successful implementation of the SPS Agreement. According the SPS Agreement must avoid the use of illegitimate SPS measures and promote market access. It is therefore crucial that the SPS Agreement be analysed to determine whether its text, application and or interpretation satisfies the objective of opening up global food trade especially for developing states. The objective is to show the significance of a regulatory framework that is as much as possible devoid of any loopholes or shortcomings, which could frustrate the developmental interests. Inappropriate accommodation of developmental interests in the SPS Agreement could have adverse impacts on the development prospectus of developing countries. , Thesis (LLM) -- Faculty of Law, 2013
- Full Text:
- Date Issued: 2013
- Authors: Nyatsanza, Sharon
- Date: 2013
- Subjects: World Trade Organization , Food contamination , Food handling -- Safety measures
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10353/27413 , vital:67294
- Description: Food safety and consumer protection has been a major concern of regulators since the 12th century. Sanitary and Phytosanitary (SPS) measures were therefore introduced to protect human, animal and plant safety. With the expansion of international trade came the increase in the use of SPS measures. However these increases in the use of SPS measures were accompanied with their misuse for protectionist purposes. SPS measures which had been created for legitimate purposes quickly became significant barriers to trade. The World Trade Organisation (WTO) adopted the WTO Agreement on Sanitary and Phytosanitary Measures (SPS Agreement) as a mechanism to regulate the use of SPS measures and avoid their potential use as protectionist tools. Trade liberalization and market access has been a primary aim of the WTO, therefore in principle the SPS Agreement is supposed to open up global food trade for all countries.Apart from opening up global food trade, another purpose of the SPS Agreement was to protect the developing countries, accommodate their special needs and in turn promote their economic development. Developing countries are heavily dependent on global food trade for their economic development. However developing states can only benefit from global food trade if they comply with SPS standards set in the importing countries. Considering their reliance on the agro – food sector the economic development of developing states is heavily reliant on the successful implementation of the SPS Agreement. According the SPS Agreement must avoid the use of illegitimate SPS measures and promote market access. It is therefore crucial that the SPS Agreement be analysed to determine whether its text, application and or interpretation satisfies the objective of opening up global food trade especially for developing states. The objective is to show the significance of a regulatory framework that is as much as possible devoid of any loopholes or shortcomings, which could frustrate the developmental interests. Inappropriate accommodation of developmental interests in the SPS Agreement could have adverse impacts on the development prospectus of developing countries. , Thesis (LLM) -- Faculty of Law, 2013
- Full Text:
- Date Issued: 2013
Open debate: ephemeral democracies: interrogating commonality in South Africa
- Authors: Makhubu, Nomusa
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/147626 , vital:38655 , https://0-doi.org.wam.seals.ac.za/10.1080/09528822.2013.796200
- Description: South Africa's Post-Apartheid era is characterized by the rhetoric of ‘unity in diversity’. However, numerous artist-led public interventions disclose alienating socio-economic conditions. Neoliberal reforms in the context of prevailing structural designs of Apartheid in South Africa weaken the democratization process, making it figurative rather than tangible and participatory. There is a pervasive perception that centres of power within the arts in South Africa are located in institutions of white proprietorship. As a result, young artists create independent establishments where they can have some control over cultural production and dissemination. This article debates the different strategies that are used by young practising artists to confront contemporary challenges in Post-Apartheid South Africa. One of these strategies promotes integration and deracialization through persistent engagement with predominantly white institutions in order to generate a sense of common purpose while the other opts for the power of provocative racialized but marginalized cultural movements.
- Full Text:
- Date Issued: 2013
- Authors: Makhubu, Nomusa
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/147626 , vital:38655 , https://0-doi.org.wam.seals.ac.za/10.1080/09528822.2013.796200
- Description: South Africa's Post-Apartheid era is characterized by the rhetoric of ‘unity in diversity’. However, numerous artist-led public interventions disclose alienating socio-economic conditions. Neoliberal reforms in the context of prevailing structural designs of Apartheid in South Africa weaken the democratization process, making it figurative rather than tangible and participatory. There is a pervasive perception that centres of power within the arts in South Africa are located in institutions of white proprietorship. As a result, young artists create independent establishments where they can have some control over cultural production and dissemination. This article debates the different strategies that are used by young practising artists to confront contemporary challenges in Post-Apartheid South Africa. One of these strategies promotes integration and deracialization through persistent engagement with predominantly white institutions in order to generate a sense of common purpose while the other opts for the power of provocative racialized but marginalized cultural movements.
- Full Text:
- Date Issued: 2013
Obituary: John Mayne English 1922-2013
- Authors: Lewis, Colin A
- Date: 2013
- Language: English
- Type: Article , text
- Identifier: vital:6162 , http://hdl.handle.net/10962/d1004782
- Description: In 1962 John moved south to Johannesburg, but that bustling city held few attractions for him and he moved further south, to the cathedral city of Grahamstown. Grahamstown, with its nineteenth century Gothic cathedral, elegant Georgian buildings, and distinctive grandeur of Rhodes University, St Andrew's College and other buildings designed by Herbert Baker and his colleagues, suited John. He particularly enjoyed the academic, social, artistic and dramatic life of the community, where many older members of society were distinguished old-Africa hands. John thoroughly enjoyed Grahamstown where, in the partnership of Hoskins and English, he made his mark in the restoration and extension of many significant buildings. His addition to the Anglican chapel at Hog's Back is a masterpiece, as is his incorporation of the old fayade into the rebuilding and extension of the Magistrates' Court.
- Full Text:
- Date Issued: 2013
- Authors: Lewis, Colin A
- Date: 2013
- Language: English
- Type: Article , text
- Identifier: vital:6162 , http://hdl.handle.net/10962/d1004782
- Description: In 1962 John moved south to Johannesburg, but that bustling city held few attractions for him and he moved further south, to the cathedral city of Grahamstown. Grahamstown, with its nineteenth century Gothic cathedral, elegant Georgian buildings, and distinctive grandeur of Rhodes University, St Andrew's College and other buildings designed by Herbert Baker and his colleagues, suited John. He particularly enjoyed the academic, social, artistic and dramatic life of the community, where many older members of society were distinguished old-Africa hands. John thoroughly enjoyed Grahamstown where, in the partnership of Hoskins and English, he made his mark in the restoration and extension of many significant buildings. His addition to the Anglican chapel at Hog's Back is a masterpiece, as is his incorporation of the old fayade into the rebuilding and extension of the Magistrates' Court.
- Full Text:
- Date Issued: 2013
Nutrient-mediated effects on Cornops aquaticum Brüner (Orthoptera: Acrididae), a potential biological control agent of water hyacinth, Eichhornia crassipes (Mart.) Solms (Pontederiaceae)
- Bownes, Angela, Hill, Martin P, Byrne, Marcus J
- Authors: Bownes, Angela , Hill, Martin P , Byrne, Marcus J
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/406131 , vital:70241 , xlink:href="https://doi.org/10.1016/j.biocontrol.2013.07.023"
- Description: Environmental nutrient availability can drive and modify both plant responses to herbivory by phytophagous insects and insect feeding patterns which, in insect-weed systems, may ultimately determine whether biological control succeeds or fails. The impacts of insect biological control agents on the invasive aquatic weed, water hyacinth (Eichhornia crassipes) vary with nutrient levels in the environment. It was therefore considered important to evaluate nutrient-specific responses of E. crassipes to a grasshopper herbivore, Cornops aquaticum, prior to its release in South Africa. Both plant productivity and the response of E. crassipes to herbivory by C. aquaticum were nutrient dependent. Increases in plant biomass and leaf and ramet production were correlated with increases in nutrients in the water and plant biomass accumulation was reduced by herbivory at all three nutrient levels tested (high = 67%; medium = 100%; low = 400%). C. aquaticum nymphs fed E. crassipes leaves with the lowest nitrogen levels produced the highest biomass of frass during their development, indicating compensatory consumption. The results suggest that environmental nutrient availability will influence efficacy of C. aquaticum. They also provide further evidence that E. crassipes problems are exacerbated by an over-abundance of nutrients in aquatic environments, and that biological control would be a highly effective management tool if aquatic systems in South Africa were less polluted. Additionally, the results also show how an understanding of the fundamental responses of E. crassipes and its insect biocontrol agents to their environment can assist in determining specific management strategies or interventions according to prevailing site-specific conditions.
- Full Text:
- Date Issued: 2013
- Authors: Bownes, Angela , Hill, Martin P , Byrne, Marcus J
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/406131 , vital:70241 , xlink:href="https://doi.org/10.1016/j.biocontrol.2013.07.023"
- Description: Environmental nutrient availability can drive and modify both plant responses to herbivory by phytophagous insects and insect feeding patterns which, in insect-weed systems, may ultimately determine whether biological control succeeds or fails. The impacts of insect biological control agents on the invasive aquatic weed, water hyacinth (Eichhornia crassipes) vary with nutrient levels in the environment. It was therefore considered important to evaluate nutrient-specific responses of E. crassipes to a grasshopper herbivore, Cornops aquaticum, prior to its release in South Africa. Both plant productivity and the response of E. crassipes to herbivory by C. aquaticum were nutrient dependent. Increases in plant biomass and leaf and ramet production were correlated with increases in nutrients in the water and plant biomass accumulation was reduced by herbivory at all three nutrient levels tested (high = 67%; medium = 100%; low = 400%). C. aquaticum nymphs fed E. crassipes leaves with the lowest nitrogen levels produced the highest biomass of frass during their development, indicating compensatory consumption. The results suggest that environmental nutrient availability will influence efficacy of C. aquaticum. They also provide further evidence that E. crassipes problems are exacerbated by an over-abundance of nutrients in aquatic environments, and that biological control would be a highly effective management tool if aquatic systems in South Africa were less polluted. Additionally, the results also show how an understanding of the fundamental responses of E. crassipes and its insect biocontrol agents to their environment can assist in determining specific management strategies or interventions according to prevailing site-specific conditions.
- Full Text:
- Date Issued: 2013
Nonlinear optical behavior of metal octaphenoxy phthalocyanines
- Sanusi, Sikiru O, Antunes, Edith M, Nyokong, Tebello
- Authors: Sanusi, Sikiru O , Antunes, Edith M , Nyokong, Tebello
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/241717 , vital:50963 , xlink:href="https://doi.org/10.1142/S1088424613500715"
- Description: In this work, we investigated the nonlinear optical absorption properties of chloroaluminum, chlorogallium, chloroindium, zinc and lead octaphenoxy phthalocyanines in a dimethyl sulphoxide solution using 5 ns pulses at 532 nm. Using the Z-scan technique, the nonlinear optical properties and the excited state absorption cross-sections were determined by fitting the Z-scan data. The k value was the highest for Pb derivative at 211, making it the best nonlinear optical material. In terms of hyperpolarizability, Pb derivative (containing a larger central metal) also gave the largest value followed by aluminum derivative (containing a small central metal). The distortion of the ring caused by the central metal is used to explain the hyperpolarizability values. Large nonlinear absorption coefficient values, βeff, in the range of 3.558–4.763 × 10-9 cm.W-1 and low saturation fluence values, Fsat between 21.5–38.5 mJ.cm-2, were obtained for these samples.
- Full Text:
- Date Issued: 2013
- Authors: Sanusi, Sikiru O , Antunes, Edith M , Nyokong, Tebello
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/241717 , vital:50963 , xlink:href="https://doi.org/10.1142/S1088424613500715"
- Description: In this work, we investigated the nonlinear optical absorption properties of chloroaluminum, chlorogallium, chloroindium, zinc and lead octaphenoxy phthalocyanines in a dimethyl sulphoxide solution using 5 ns pulses at 532 nm. Using the Z-scan technique, the nonlinear optical properties and the excited state absorption cross-sections were determined by fitting the Z-scan data. The k value was the highest for Pb derivative at 211, making it the best nonlinear optical material. In terms of hyperpolarizability, Pb derivative (containing a larger central metal) also gave the largest value followed by aluminum derivative (containing a small central metal). The distortion of the ring caused by the central metal is used to explain the hyperpolarizability values. Large nonlinear absorption coefficient values, βeff, in the range of 3.558–4.763 × 10-9 cm.W-1 and low saturation fluence values, Fsat between 21.5–38.5 mJ.cm-2, were obtained for these samples.
- Full Text:
- Date Issued: 2013
NGOs and rural movements in contemporary South Africa:
- Authors: Helliker, Kirk D
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/144666 , vital:38368 , DOI: 10.1080/02533952.2013.806415
- Description: This article provides a critical examination of relationships between non-governmental organisations (NGOs) and rural movements in post-apartheid South Africa, particularly with regard to the possible subordination of movements to NGOs. In discussing NGOs as a particular organisational form, and in reviewing some arguments pertaining to NGOs and rural movements globally, I explore whether NGOs in South Africa have a progressive role to play in agrarian transformation.
- Full Text:
- Date Issued: 2013
- Authors: Helliker, Kirk D
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/144666 , vital:38368 , DOI: 10.1080/02533952.2013.806415
- Description: This article provides a critical examination of relationships between non-governmental organisations (NGOs) and rural movements in post-apartheid South Africa, particularly with regard to the possible subordination of movements to NGOs. In discussing NGOs as a particular organisational form, and in reviewing some arguments pertaining to NGOs and rural movements globally, I explore whether NGOs in South Africa have a progressive role to play in agrarian transformation.
- Full Text:
- Date Issued: 2013