Optical nonlinearities in non-peripherally substituted pyridyloxy phthalocyanines: a combined effect of symmetry, ring-strain and demetallation
- Sanusi, Kayode, Antunes, Edith M, Nyokong, Tebello
- Authors: Sanusi, Kayode , Antunes, Edith M , Nyokong, Tebello
- Language: English
- Type: Article
- Identifier: vital:7301 , http://hdl.handle.net/10962/d1020375
- Description: The optical nonlinearities of six non-peripherally-substituted pyridyloxy phthalocyanines have been studied at 532 nm using a nanosecond Z-scan technique in a dimethyl sulphoxide solution. Ring-strain effects and the absence of a metal center were found to greatly reduce the inherent high nonlinearities expected of some of these phthalocyanine complexes. Of the six molecules investigated, 1(4),8(11),15(18),22(25)-tetrakis-(2-pyridyloxy)phthalocyaninato lead(II) 3, 1(4),8(11),15(18),22(25)-tetrakis-(2-pyridyloxy)phthalocyanine 5, and 1(4),8(11),15(18),22(25)-tetrakis-(4-pyridyloxy)phthalocyanine 6 were found to exhibit negligible nonlinear optical behavior, due to either the absence of asymmetry or central metal and/or the presence of a ring-strain effect. A two-photon absorption process was found to be the major contributor to the observed reverse saturable absorption (RSA) in 1(4),8(11),15(18),22(25)-tetrakis-(4-pyridyloxy)phthalocyaninato lead(II) 4, 1(4)-mono-(2-pyridyloxy)phthalocyaninato lead(II) 7, and 1(4)-mono-(4-pyridyloxy)phthalocyaninato lead(II) 8, with large two-photon absorption cross-section, high hyperpolarizability and high third-order susceptibility values in the range of 4.53 × 10−43–5.33 × 10−42 cm4 s per photon, 1.61 × 10−28–1.89 × 10−27 esu and 9.73 × 10−12–7.05 × 10−11 esu respectively. , Original publication is available at http://dx.doi.org/10.1039/C3DT52462K , Arbortext Advanced Print Publisher 9.1.520/W Unicode , Acrobat Distiller 10.0.0 (Windows); modified using iText� 5.3.3 �2000-2012 1T3XT BVBA (AGPL-version)
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- Authors: Sanusi, Kayode , Antunes, Edith M , Nyokong, Tebello
- Language: English
- Type: Article
- Identifier: vital:7301 , http://hdl.handle.net/10962/d1020375
- Description: The optical nonlinearities of six non-peripherally-substituted pyridyloxy phthalocyanines have been studied at 532 nm using a nanosecond Z-scan technique in a dimethyl sulphoxide solution. Ring-strain effects and the absence of a metal center were found to greatly reduce the inherent high nonlinearities expected of some of these phthalocyanine complexes. Of the six molecules investigated, 1(4),8(11),15(18),22(25)-tetrakis-(2-pyridyloxy)phthalocyaninato lead(II) 3, 1(4),8(11),15(18),22(25)-tetrakis-(2-pyridyloxy)phthalocyanine 5, and 1(4),8(11),15(18),22(25)-tetrakis-(4-pyridyloxy)phthalocyanine 6 were found to exhibit negligible nonlinear optical behavior, due to either the absence of asymmetry or central metal and/or the presence of a ring-strain effect. A two-photon absorption process was found to be the major contributor to the observed reverse saturable absorption (RSA) in 1(4),8(11),15(18),22(25)-tetrakis-(4-pyridyloxy)phthalocyaninato lead(II) 4, 1(4)-mono-(2-pyridyloxy)phthalocyaninato lead(II) 7, and 1(4)-mono-(4-pyridyloxy)phthalocyaninato lead(II) 8, with large two-photon absorption cross-section, high hyperpolarizability and high third-order susceptibility values in the range of 4.53 × 10−43–5.33 × 10−42 cm4 s per photon, 1.61 × 10−28–1.89 × 10−27 esu and 9.73 × 10−12–7.05 × 10−11 esu respectively. , Original publication is available at http://dx.doi.org/10.1039/C3DT52462K , Arbortext Advanced Print Publisher 9.1.520/W Unicode , Acrobat Distiller 10.0.0 (Windows); modified using iText� 5.3.3 �2000-2012 1T3XT BVBA (AGPL-version)
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Optimal cycle dating of large financial time series
- Identifier: http://hdl.handle.net/10948/17735 , vital:28445
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- Identifier: http://hdl.handle.net/10948/17735 , vital:28445
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Optimisation of cold rolling process parameters to improve surface quality of the AA 3003-H22 treadbright coils
- Authors: Makhanya, Lehlohonolo
- Subjects: Aluminum alloys
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9611 , http://hdl.handle.net/10948/554 , Aluminum alloys
- Description: The main objective of this dissertation was to investigate how cold rolling process parameters could be optimised to improve surface quality of the AA 3003 H22 treadbright coils. This treadbright product is one of Hulett Aluminium’s main products and is exported mainly to the North American market. One of its critical requirements is a defect-free bright surface. The literature review was conducted with particular focus on the effects of selected parameters or settings with respect to surface quality and a chapter outlining these aspects has been included. It was clear from the literature review that selected parameters do affect the surface quality and if adjusted accordingly can improve surface quality on treadbright coils. Subsequent chapters after the literature review outline how the tests were conducted, procedures followed and equipments used from the cold rolling machine to laboratories. Surface appearance results after each parameter was adjusted, showed that the surface quality did improve and even got better when other parameters like the colouring roll angle and percentage reduction were adjusted. Correct working limits within which each parameter would yield acceptable surface quality were also established. All experiments conducted had no influence on the microstructure of the metal as it remained the same throughout each experiment. The same has been found with the mechanical properties as percentage reductions experiments led to no change in tensile strength, proof strength and percentage elongation. In conclusion, this research has proved that cold rolling process parameters selected did affect the product surface quality. If controlled they can be used to optimise the surface quality on the treadbright product as required by Hulett Aluminium and its customers.
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- Authors: Makhanya, Lehlohonolo
- Subjects: Aluminum alloys
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9611 , http://hdl.handle.net/10948/554 , Aluminum alloys
- Description: The main objective of this dissertation was to investigate how cold rolling process parameters could be optimised to improve surface quality of the AA 3003 H22 treadbright coils. This treadbright product is one of Hulett Aluminium’s main products and is exported mainly to the North American market. One of its critical requirements is a defect-free bright surface. The literature review was conducted with particular focus on the effects of selected parameters or settings with respect to surface quality and a chapter outlining these aspects has been included. It was clear from the literature review that selected parameters do affect the surface quality and if adjusted accordingly can improve surface quality on treadbright coils. Subsequent chapters after the literature review outline how the tests were conducted, procedures followed and equipments used from the cold rolling machine to laboratories. Surface appearance results after each parameter was adjusted, showed that the surface quality did improve and even got better when other parameters like the colouring roll angle and percentage reduction were adjusted. Correct working limits within which each parameter would yield acceptable surface quality were also established. All experiments conducted had no influence on the microstructure of the metal as it remained the same throughout each experiment. The same has been found with the mechanical properties as percentage reductions experiments led to no change in tensile strength, proof strength and percentage elongation. In conclusion, this research has proved that cold rolling process parameters selected did affect the product surface quality. If controlled they can be used to optimise the surface quality on the treadbright product as required by Hulett Aluminium and its customers.
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Original jazz music
- Unknown
- Authors: Unknown
- Subjects: McGregor, Chris--1936-1990 , Dollar Brand , Jazz at the Playhouse
- Language: English
- Type: Article
- Identifier: vital:13737 , http://hdl.handle.net/10962/d1012751
- Description: Photocopied article from the South African newspaper The Star about Chris McGregor rehearsing for the concert Jazz at the Playhouse. There is a picture with this article of Chris McGregor (left) talking to 4 other persons.
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- Authors: Unknown
- Subjects: McGregor, Chris--1936-1990 , Dollar Brand , Jazz at the Playhouse
- Language: English
- Type: Article
- Identifier: vital:13737 , http://hdl.handle.net/10962/d1012751
- Description: Photocopied article from the South African newspaper The Star about Chris McGregor rehearsing for the concert Jazz at the Playhouse. There is a picture with this article of Chris McGregor (left) talking to 4 other persons.
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Outcomes and Risk Factors Associated with Drug Resistant Tuberculosis in Rural Eastern Cape, South Africa.pdf
- Identifier: http://hdl.handle.net/11260/5058 , vital:44312
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- Identifier: http://hdl.handle.net/11260/5058 , vital:44312
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Palais des Glaces
- Unknown
- Authors: Unknown
- Subjects: McGregor, Chris--1936-1990 , Palais des Glaces , Jazz
- Language: French
- Type: Text
- Identifier: vital:13786 , http://hdl.handle.net/10962/d1012818
- Description: Original poster for November 1977 concerts at the Palais des Glaces, in Paris, France, where Chris McGregor is going to play.
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- Authors: Unknown
- Subjects: McGregor, Chris--1936-1990 , Palais des Glaces , Jazz
- Language: French
- Type: Text
- Identifier: vital:13786 , http://hdl.handle.net/10962/d1012818
- Description: Original poster for November 1977 concerts at the Palais des Glaces, in Paris, France, where Chris McGregor is going to play.
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PaperFinalHUMOUR.docx
- Alicia Van Der Spuy, Lynn Wood
- Authors: Alicia Van Der Spuy , Lynn Wood
- Identifier: http://hdl.handle.net/11260/1773 , vital:38106
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- Authors: Alicia Van Der Spuy , Lynn Wood
- Identifier: http://hdl.handle.net/11260/1773 , vital:38106
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Perception-of-consumers-on-local-and-global-brands-implications-for-the-sustainability-1528-2686-27-2-493.pdf
- Authors: Adelin Kantore
- Identifier: http://hdl.handle.net/11260/8128 , vital:61391
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- Authors: Adelin Kantore
- Identifier: http://hdl.handle.net/11260/8128 , vital:61391
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Perceptions of health care professionals regarding facilitation of resilience in the workplace
- Smith, G
- Authors: Smith, G
- Subjects: Nurses -- Job stress , Resilience (Personality trait) , Nursing -- Psychological aspects
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:10086 , http://hdl.handle.net/10948/d1020948
- Description: A person’s career takes up a large portion of his or her life for a minimum of 8 hours per day. A large portion of their time is spent performing their duties which are often accompanied by various demands or pressure that can result in an employee experiencing stress. Over time this build-up of stress due to job demands affects their ability to perform at work. This study aimed to identify, explore and describe the factors that facilitate the resilience of healthcare professionals working at a Campus Health Service at a Higher Education Institution. An exploratory descriptive study consisting of a qualitative nature was employed. Data was obtained from semi-structured interviews. The questions that were posed to participants read as follows: (1) “Tell me about the demands placed on you in your current work situation”, (2) “How do you cope with the demands placed on you?”, (3) “What can be done to assist you to cope better at work?”, and lastly (4) “Any additional questions/comments?”. The fourth question was added by the researcher in order for participants to have the opportunity to add to what they have said previously. Data was gathered until data saturation was reached. Tesch’s model of content analysis as well as Guba’s model of trustworthiness was employed, in order to analyse the data. An independent coder was subsequently employed to ensure the trustworthiness of the data. The findings revealed that all participants found workplace demands to be stressful, in terms of physical, emotional and time-related demands placed on them. Participants identified strategies that could help them cope with their demands such as open air activities, debriefing with colleagues or making use of a wellness line, maintaining a positive attitude, support from management and colleagues, the ability to practice initiative and autonomous decision-making, and lastly, religious practices. In addition, participants made recommendations on how employers can help relieve their stress. The recommendations included developing an in-house wellness programme, providing sufficient staff of the correct categories, providing adequate facilities and equipment to improve efficiency, providing developmental opportunities, scheduling training programmes for less busy times of the year, and lastly, introducing elements of structured flexi-time for employees.
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- Authors: Smith, G
- Subjects: Nurses -- Job stress , Resilience (Personality trait) , Nursing -- Psychological aspects
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:10086 , http://hdl.handle.net/10948/d1020948
- Description: A person’s career takes up a large portion of his or her life for a minimum of 8 hours per day. A large portion of their time is spent performing their duties which are often accompanied by various demands or pressure that can result in an employee experiencing stress. Over time this build-up of stress due to job demands affects their ability to perform at work. This study aimed to identify, explore and describe the factors that facilitate the resilience of healthcare professionals working at a Campus Health Service at a Higher Education Institution. An exploratory descriptive study consisting of a qualitative nature was employed. Data was obtained from semi-structured interviews. The questions that were posed to participants read as follows: (1) “Tell me about the demands placed on you in your current work situation”, (2) “How do you cope with the demands placed on you?”, (3) “What can be done to assist you to cope better at work?”, and lastly (4) “Any additional questions/comments?”. The fourth question was added by the researcher in order for participants to have the opportunity to add to what they have said previously. Data was gathered until data saturation was reached. Tesch’s model of content analysis as well as Guba’s model of trustworthiness was employed, in order to analyse the data. An independent coder was subsequently employed to ensure the trustworthiness of the data. The findings revealed that all participants found workplace demands to be stressful, in terms of physical, emotional and time-related demands placed on them. Participants identified strategies that could help them cope with their demands such as open air activities, debriefing with colleagues or making use of a wellness line, maintaining a positive attitude, support from management and colleagues, the ability to practice initiative and autonomous decision-making, and lastly, religious practices. In addition, participants made recommendations on how employers can help relieve their stress. The recommendations included developing an in-house wellness programme, providing sufficient staff of the correct categories, providing adequate facilities and equipment to improve efficiency, providing developmental opportunities, scheduling training programmes for less busy times of the year, and lastly, introducing elements of structured flexi-time for employees.
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perceptions-of-cultural-and-heritage-tourism-entrepreneurship-among-students-at-a-higher-educational-institution-in-cape.pdf
- Authors: Adelin Kantore
- Identifier: http://hdl.handle.net/11260/7392 , vital:53974
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- Authors: Adelin Kantore
- Identifier: http://hdl.handle.net/11260/7392 , vital:53974
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Personal background from an application for a cultural grant
- Unknown
- Authors: Unknown
- Subjects: McGregor, Chris--1936-1990 , Blue Notes (Musical group : South Africa) , Jazz , Jazz musicians
- Language: English
- Identifier: vital:13569 , http://hdl.handle.net/10962/d1006523 , McGregor, Chris--1936-1990 , Blue Notes (Musical group : South Africa) , Jazz , Jazz musicians
- Description: Photocopied five pages from the book The Classic about Chris McGregor's early life in South Africa.
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- Authors: Unknown
- Subjects: McGregor, Chris--1936-1990 , Blue Notes (Musical group : South Africa) , Jazz , Jazz musicians
- Language: English
- Identifier: vital:13569 , http://hdl.handle.net/10962/d1006523 , McGregor, Chris--1936-1990 , Blue Notes (Musical group : South Africa) , Jazz , Jazz musicians
- Description: Photocopied five pages from the book The Classic about Chris McGregor's early life in South Africa.
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Perspectives on leadership
- Authors: Arnolds, Cecil Ashleigh
- Subjects: Leadership , Industrial management , f-sa
- Language: English
- Type: text , Lectures
- Identifier: http://hdl.handle.net/10948/21857 , vital:29794
- Description: My fields of study are business management and organizational behaviour (OB). In business management we study how to manage businesses effectively by executing various functions (marketing, finance, human resources management, general and strategic management, purchasing and logistics, public relations management, production and opertaions, information technology management) and management tasks (planning, organising, leading and control) (Bosch, Tait and Venter, 2006).
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- Authors: Arnolds, Cecil Ashleigh
- Subjects: Leadership , Industrial management , f-sa
- Language: English
- Type: text , Lectures
- Identifier: http://hdl.handle.net/10948/21857 , vital:29794
- Description: My fields of study are business management and organizational behaviour (OB). In business management we study how to manage businesses effectively by executing various functions (marketing, finance, human resources management, general and strategic management, purchasing and logistics, public relations management, production and opertaions, information technology management) and management tasks (planning, organising, leading and control) (Bosch, Tait and Venter, 2006).
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Phalama MSc 2015.pdf
- Authors: Adelin Kantore
- Identifier: http://hdl.handle.net/11260/7885 , vital:55156
- Full Text:
- Authors: Adelin Kantore
- Identifier: http://hdl.handle.net/11260/7885 , vital:55156
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- Authors: PK
- Identifier: http://hdl.handle.net/10353/13081 , vital:39463
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Philosophies that inform discipline strategies among teachers
- Authors: Von Wildemann, Amy-Rose
- Subjects: School discipline -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9504 , http://hdl.handle.net/10948/1302 , School discipline -- South Africa
- Description: Numerous teachers in South Africa are experiencing ill‐discipline within the classroom environment. They are not receiving the necessary support and guidance from the relevant departments, and thus, rely on their own reactive measures to manage the disruptive behaviour present in the classroom. Previous studies have shown that the South African Education Department has not provided all teachers with the necessary training needed to implement the new discipline strategies proposed by the Department of Education. Therefore, teachers rely on what they perceive to be effective in maintaining discipline, which is an indication of their personal teaching philosophy, as they base their own knowledge on what they have experienced and learnt in the past. This study followed a qualitative enquiry, which is descriptive and explorative. The data generation tools that were utilised for the study were, ‘drawing’ and ‘photo album’, both of which represent visual methodology activities. Furthermore, the primary aim of the study is to determine the underlying teaching philosophies that inform selected township teachers’ approaches to discipline in their classrooms. However, the findings indicated that the use of corporal punishment is still visibly prevalent in this township school. Even though it was revealed that the prominent teaching philosophy was not that of fundamental pedagogics, but featured somewhere in between the humanising pedagogy and Noddings’ theory of caring, the effects of teaching during Apartheid under the principles of fundamental pedagogics is still existent in the township.
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- Authors: Von Wildemann, Amy-Rose
- Subjects: School discipline -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9504 , http://hdl.handle.net/10948/1302 , School discipline -- South Africa
- Description: Numerous teachers in South Africa are experiencing ill‐discipline within the classroom environment. They are not receiving the necessary support and guidance from the relevant departments, and thus, rely on their own reactive measures to manage the disruptive behaviour present in the classroom. Previous studies have shown that the South African Education Department has not provided all teachers with the necessary training needed to implement the new discipline strategies proposed by the Department of Education. Therefore, teachers rely on what they perceive to be effective in maintaining discipline, which is an indication of their personal teaching philosophy, as they base their own knowledge on what they have experienced and learnt in the past. This study followed a qualitative enquiry, which is descriptive and explorative. The data generation tools that were utilised for the study were, ‘drawing’ and ‘photo album’, both of which represent visual methodology activities. Furthermore, the primary aim of the study is to determine the underlying teaching philosophies that inform selected township teachers’ approaches to discipline in their classrooms. However, the findings indicated that the use of corporal punishment is still visibly prevalent in this township school. Even though it was revealed that the prominent teaching philosophy was not that of fundamental pedagogics, but featured somewhere in between the humanising pedagogy and Noddings’ theory of caring, the effects of teaching during Apartheid under the principles of fundamental pedagogics is still existent in the township.
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Philosophy as laughter
- Authors: Hurst, Andrea
- Subjects: Laughter -- Philosophy , Philosophy -- Study and teaching , f-sa
- Language: English
- Type: text , Lectures
- Identifier: http://hdl.handle.net/10948/37103 , vital:34106
- Description: Contextualising my current philosophical preoccupations within the framework of my understanding of my task as a philosopher, I engage with the proposition that philosophers have a double task: firstly learning (and teaching) how to think, and relatedly, unexpectedly, learning/teaching how to laugh.
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- Authors: Hurst, Andrea
- Subjects: Laughter -- Philosophy , Philosophy -- Study and teaching , f-sa
- Language: English
- Type: text , Lectures
- Identifier: http://hdl.handle.net/10948/37103 , vital:34106
- Description: Contextualising my current philosophical preoccupations within the framework of my understanding of my task as a philosopher, I engage with the proposition that philosophers have a double task: firstly learning (and teaching) how to think, and relatedly, unexpectedly, learning/teaching how to laugh.
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Photo's taken in chemistry and pharmacy laboratoriums at Rhodes University where Professor Tebello Nyokong worked with her students
- Authors: Nyokong, Tebello
- Language: English
- Type: still image
- Identifier: vital:7230 , http://hdl.handle.net/10962/d1006053
- Description: Photo's taken in chemistry and pharmacy laboratoriums at Rhodes University where Professor Tebello Nyokong worked with her students.
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- Authors: Nyokong, Tebello
- Language: English
- Type: still image
- Identifier: vital:7230 , http://hdl.handle.net/10962/d1006053
- Description: Photo's taken in chemistry and pharmacy laboratoriums at Rhodes University where Professor Tebello Nyokong worked with her students.
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Photocopied article from the Jazz Magazine
- Authors: Azoulay, Eliane
- Subjects: McGregor, Chris--1936-1990 , Jazz , Jazz musicians , Blue Notes (Musical group : South Africa) , Brotherhood of Breath (Musical group) , Dollar Brand , Mabuse, Sipho
- Language: French
- Type: Article
- Identifier: vital:13485 , http://hdl.handle.net/10962/d1005620 , McGregor, Chris--1936-1990 , Jazz , Jazz musicians , Blue Notes (Musical group : South Africa) , Brotherhood of Breath (Musical group) , Dollar Brand , Mabuse, Sipho
- Description: Photocopied article in French from Jazz Magazine about the various South African bands who came to and stayed in Europe, because they were forbidden in their country. There is a short interview of Chris McGregor about his return in South Africa in 1987 and announcing his forthcoming recording with the band Brotherhood of Breath.
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- Authors: Azoulay, Eliane
- Subjects: McGregor, Chris--1936-1990 , Jazz , Jazz musicians , Blue Notes (Musical group : South Africa) , Brotherhood of Breath (Musical group) , Dollar Brand , Mabuse, Sipho
- Language: French
- Type: Article
- Identifier: vital:13485 , http://hdl.handle.net/10962/d1005620 , McGregor, Chris--1936-1990 , Jazz , Jazz musicians , Blue Notes (Musical group : South Africa) , Brotherhood of Breath (Musical group) , Dollar Brand , Mabuse, Sipho
- Description: Photocopied article in French from Jazz Magazine about the various South African bands who came to and stayed in Europe, because they were forbidden in their country. There is a short interview of Chris McGregor about his return in South Africa in 1987 and announcing his forthcoming recording with the band Brotherhood of Breath.
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Photoinactivation of Candida albicans and Escherichia coli using aluminium phthalocyanine on gold nanoparticles
- Mthethwa, Thandekile, Nyokong, Tebello
- Authors: Mthethwa, Thandekile , Nyokong, Tebello
- Language: English
- Type: Article
- Identifier: vital:7298 , http://hdl.handle.net/10962/d1020364
- Description: The conjugates of aluminium phthalocyanine (complex 1) with gold nanorods (complex 1–AuNRs) and bipyramids (complex 1–AuBPs) showed improved singlet oxygen quantum yields of 0.23 and 0.24, respectively, compared to that of complex 1 alone at 0.12. Complex 1 and its conjugates were used for the photoinactivation of fungi (C. albicans) and bacteria cells (E. coli). The Q band absorbances were the same for the Pc alone and when conjugated to AuNPs. The efficiency of these conjugates was evaluated by measuring the log reduction of the microorganisms (C. albicans and E. coli) after irradiation with visible light in the presence of photosensitizers. Aluminium phthalocyanine alone showed log 1.78 and log 2.51 reductions for C. albicans and E. coli respectively. However, the conjugates showed higher photosensitization with log 2.08 and log 3.34 for C. albicans and E. coli, respectively using 1–AuBPs. For complex 1–AuNRs log 2.53 and log 3.71 were achieved for C. albicans and E. coli respectively. The statistical analysis of the results showed that the enhanced photoinactivation observed in both microorganisms was irrespective of the shape of the nanoparticles conjugated. Photoinactivation of C. albicans was less than that of E. coli even though a higher concentration of complex 1 or its conjugates was used in C. albicans. , Original publication is available at http://dx.doi.org/10.1039/C4PP00315B , Arbortext Advanced Print Publisher 9.1.520/W Unicode , Acrobat Distiller 10.0.0 (Windows); modified using iTextSharp 5.5.1 �2000-2014 iText Group NV (AGPL-version); modified using iText� 5.3.3 �2000-2012 1T3XT BVBA (AGPL-version)
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- Authors: Mthethwa, Thandekile , Nyokong, Tebello
- Language: English
- Type: Article
- Identifier: vital:7298 , http://hdl.handle.net/10962/d1020364
- Description: The conjugates of aluminium phthalocyanine (complex 1) with gold nanorods (complex 1–AuNRs) and bipyramids (complex 1–AuBPs) showed improved singlet oxygen quantum yields of 0.23 and 0.24, respectively, compared to that of complex 1 alone at 0.12. Complex 1 and its conjugates were used for the photoinactivation of fungi (C. albicans) and bacteria cells (E. coli). The Q band absorbances were the same for the Pc alone and when conjugated to AuNPs. The efficiency of these conjugates was evaluated by measuring the log reduction of the microorganisms (C. albicans and E. coli) after irradiation with visible light in the presence of photosensitizers. Aluminium phthalocyanine alone showed log 1.78 and log 2.51 reductions for C. albicans and E. coli respectively. However, the conjugates showed higher photosensitization with log 2.08 and log 3.34 for C. albicans and E. coli, respectively using 1–AuBPs. For complex 1–AuNRs log 2.53 and log 3.71 were achieved for C. albicans and E. coli respectively. The statistical analysis of the results showed that the enhanced photoinactivation observed in both microorganisms was irrespective of the shape of the nanoparticles conjugated. Photoinactivation of C. albicans was less than that of E. coli even though a higher concentration of complex 1 or its conjugates was used in C. albicans. , Original publication is available at http://dx.doi.org/10.1039/C4PP00315B , Arbortext Advanced Print Publisher 9.1.520/W Unicode , Acrobat Distiller 10.0.0 (Windows); modified using iTextSharp 5.5.1 �2000-2014 iText Group NV (AGPL-version); modified using iText� 5.3.3 �2000-2012 1T3XT BVBA (AGPL-version)
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