Remix Abissa
- Betika (composer, performer), Ntoumba Minka (arranger, bass guitar)), Ernest Mvouama (synthesiser), Briskard Kouadio (accoustic guitar), Dallas, Briskard Kouadio (solo guitar), Kouaho (percussion), Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus), Awa Diabate, Sanota Doumbie (chorus), Ernest Mvouama
- Authors: Betika (composer, performer) , Ntoumba Minka (arranger, bass guitar)) , Ernest Mvouama (synthesiser) , Briskard Kouadio (accoustic guitar) , Dallas, Briskard Kouadio (solo guitar) , Kouaho (percussion) , Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus) , Awa Diabate, Sanota Doumbie (chorus) , Ernest Mvouama
- Date: 2000
- Subjects: Popular music , Popular music--Africa, West , Africa Cote d'Ivoire Grand-Bassam f-ml
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/127580 , vital:36023 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDCO4-08
- Description: Ivorian band with solo and chorus singing, accompained by synthesier, guitars and percussion
- Full Text: false
- Date Issued: 2000
- Authors: Betika (composer, performer) , Ntoumba Minka (arranger, bass guitar)) , Ernest Mvouama (synthesiser) , Briskard Kouadio (accoustic guitar) , Dallas, Briskard Kouadio (solo guitar) , Kouaho (percussion) , Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus) , Awa Diabate, Sanota Doumbie (chorus) , Ernest Mvouama
- Date: 2000
- Subjects: Popular music , Popular music--Africa, West , Africa Cote d'Ivoire Grand-Bassam f-ml
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/127580 , vital:36023 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDCO4-08
- Description: Ivorian band with solo and chorus singing, accompained by synthesier, guitars and percussion
- Full Text: false
- Date Issued: 2000
Ah! les hommes
- Betika (composer, performer), Ntoumba Minka (arranger, bass guitar)), Ernest Mvouama (synthesiser, Briskard Kouadio (accoustic guitar), Kouaho (percussion), Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus), Awa Diabate, Sanota Doumbie (chorus), Ernest Mvouama
- Authors: Betika (composer, performer) , Ntoumba Minka (arranger, bass guitar)) , Ernest Mvouama (synthesiser , Briskard Kouadio (accoustic guitar) , Kouaho (percussion) , Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus) , Awa Diabate, Sanota Doumbie (chorus) , Ernest Mvouama
- Date: 2000
- Subjects: Popular music , Popular music--Africa, West , Africa Cote d'Ivoire Grand-Bassam f-ml
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/127459 , vital:36013 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDCO4-01
- Description: Ivorian band with solo and chorus,accompained by synthesiser, guitars and percission
- Full Text: false
- Date Issued: 2000
- Authors: Betika (composer, performer) , Ntoumba Minka (arranger, bass guitar)) , Ernest Mvouama (synthesiser , Briskard Kouadio (accoustic guitar) , Kouaho (percussion) , Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus) , Awa Diabate, Sanota Doumbie (chorus) , Ernest Mvouama
- Date: 2000
- Subjects: Popular music , Popular music--Africa, West , Africa Cote d'Ivoire Grand-Bassam f-ml
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/127459 , vital:36013 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDCO4-01
- Description: Ivorian band with solo and chorus,accompained by synthesiser, guitars and percission
- Full Text: false
- Date Issued: 2000
Lekoussa
- Betika (composer, performer), Ntoumba Minka (arranger, bass guitar)), Ernest Mvouama (synthesiser), Briskard Kouadio (accoustic guitar), Dallas, Briskard Kouadio (accoustic guitar), Kouaho (percussion), Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus), Awa Diabate, Sanota Doumbie (chorus), Ernest Mvouama
- Authors: Betika (composer, performer) , Ntoumba Minka (arranger, bass guitar)) , Ernest Mvouama (synthesiser) , Briskard Kouadio (accoustic guitar) , Dallas, Briskard Kouadio (accoustic guitar) , Kouaho (percussion) , Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus) , Awa Diabate, Sanota Doumbie (chorus) , Ernest Mvouama
- Date: 2000
- Subjects: Popular music , Popular music--Africa, West , Africa Cote d'Ivoire Grand-Bassam f-ml
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/127509 , vital:36018 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDCO4-03
- Description: Ivorian band with solo and chorus, accompained by synthesier, guitars and percussion
- Full Text: false
- Date Issued: 2000
- Authors: Betika (composer, performer) , Ntoumba Minka (arranger, bass guitar)) , Ernest Mvouama (synthesiser) , Briskard Kouadio (accoustic guitar) , Dallas, Briskard Kouadio (accoustic guitar) , Kouaho (percussion) , Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus) , Awa Diabate, Sanota Doumbie (chorus) , Ernest Mvouama
- Date: 2000
- Subjects: Popular music , Popular music--Africa, West , Africa Cote d'Ivoire Grand-Bassam f-ml
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/127509 , vital:36018 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDCO4-03
- Description: Ivorian band with solo and chorus, accompained by synthesier, guitars and percussion
- Full Text: false
- Date Issued: 2000
Belesky
- Betika (composer, performer), Ntoumba Minka (arranger, bass guitar)), Ernest Mvouama (synthesiser), Briskard Kouadio (accoustic guitar), Dallas, Briskard Kouadio (solo guitar), Kouaho (percussion), Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus), Awa Diabate, Sanota Doumbie (chorus), Ernest Mvouama
- Authors: Betika (composer, performer) , Ntoumba Minka (arranger, bass guitar)) , Ernest Mvouama (synthesiser) , Briskard Kouadio (accoustic guitar) , Dallas, Briskard Kouadio (solo guitar) , Kouaho (percussion) , Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus) , Awa Diabate, Sanota Doumbie (chorus) , Ernest Mvouama
- Date: 2000
- Subjects: Popular music , Popular music--Africa, West , Africa Cote d'Ivoire Grand-Bassam f-ml
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/127558 , vital:36021 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDCO4-06
- Description: Ivorian band with solo and chorus singing, accompained by synthesier, guitars and percussion
- Full Text: false
- Date Issued: 2000
- Authors: Betika (composer, performer) , Ntoumba Minka (arranger, bass guitar)) , Ernest Mvouama (synthesiser) , Briskard Kouadio (accoustic guitar) , Dallas, Briskard Kouadio (solo guitar) , Kouaho (percussion) , Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus) , Awa Diabate, Sanota Doumbie (chorus) , Ernest Mvouama
- Date: 2000
- Subjects: Popular music , Popular music--Africa, West , Africa Cote d'Ivoire Grand-Bassam f-ml
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/127558 , vital:36021 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDCO4-06
- Description: Ivorian band with solo and chorus singing, accompained by synthesier, guitars and percussion
- Full Text: false
- Date Issued: 2000
Moya
- Betika (composer, performer), Ntoumba Minka (arranger, bass guitar)), Ernest Mvouama (synthesiser), Briskard Kouadio (accoustic guitar), Dallas, Briskard Kouadio (solo guitar), Kouaho (percussion), Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus), Awa Diabate, Sanota Doumbie (chorus), Ernest Mvouama
- Authors: Betika (composer, performer) , Ntoumba Minka (arranger, bass guitar)) , Ernest Mvouama (synthesiser) , Briskard Kouadio (accoustic guitar) , Dallas, Briskard Kouadio (solo guitar) , Kouaho (percussion) , Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus) , Awa Diabate, Sanota Doumbie (chorus) , Ernest Mvouama
- Date: 2000
- Subjects: Popular music , Popular music--Africa, West , Africa Cote d'Ivoire Grand-Bassam f-ml
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/127541 , vital:36020 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDCO4-05
- Description: Ivorian band with solo and chorus singing, accompained by synthesier, guitars and percussion
- Full Text: false
- Date Issued: 2000
- Authors: Betika (composer, performer) , Ntoumba Minka (arranger, bass guitar)) , Ernest Mvouama (synthesiser) , Briskard Kouadio (accoustic guitar) , Dallas, Briskard Kouadio (solo guitar) , Kouaho (percussion) , Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus) , Awa Diabate, Sanota Doumbie (chorus) , Ernest Mvouama
- Date: 2000
- Subjects: Popular music , Popular music--Africa, West , Africa Cote d'Ivoire Grand-Bassam f-ml
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/127541 , vital:36020 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDCO4-05
- Description: Ivorian band with solo and chorus singing, accompained by synthesier, guitars and percussion
- Full Text: false
- Date Issued: 2000
Minwoun
- Betika (composer, performer), Ntoumba Minka (arranger, bass guitar)), Ernest Mvouama (synthesiser), Briskard Kouadio (accoustic guitar), Dallas, Briskard Kouadio (solo guitar), Kouaho (percussion), Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus), Awa Diabate, Sanota Doumbie (chorus), Ernest Mvouama
- Authors: Betika (composer, performer) , Ntoumba Minka (arranger, bass guitar)) , Ernest Mvouama (synthesiser) , Briskard Kouadio (accoustic guitar) , Dallas, Briskard Kouadio (solo guitar) , Kouaho (percussion) , Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus) , Awa Diabate, Sanota Doumbie (chorus) , Ernest Mvouama
- Date: 2000
- Subjects: Popular music , Popular music--Africa, West , Africa Cote d'Ivoire Grand-Bassam f-ml
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/127563 , vital:36022 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDCO4-07
- Description: Ivorian band with solo and chorus singing, accompained by synthesier, guitars and percussion
- Full Text: false
- Date Issued: 2000
- Authors: Betika (composer, performer) , Ntoumba Minka (arranger, bass guitar)) , Ernest Mvouama (synthesiser) , Briskard Kouadio (accoustic guitar) , Dallas, Briskard Kouadio (solo guitar) , Kouaho (percussion) , Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus) , Awa Diabate, Sanota Doumbie (chorus) , Ernest Mvouama
- Date: 2000
- Subjects: Popular music , Popular music--Africa, West , Africa Cote d'Ivoire Grand-Bassam f-ml
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/127563 , vital:36022 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDCO4-07
- Description: Ivorian band with solo and chorus singing, accompained by synthesier, guitars and percussion
- Full Text: false
- Date Issued: 2000
Maudit soit de jour
- Betika (composer, performer), Ntoumba Minka (arranger, bass guitar)), Ernest Mvouama (synthesiser), Briskard Kouadio (accoustic guitar), Dallas, Briskard Kouadio (solo guitar), Kouaho (percussion), Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus), Awa Diabate, Sanota Doumbie (chorus), Ernest Mvouama
- Authors: Betika (composer, performer) , Ntoumba Minka (arranger, bass guitar)) , Ernest Mvouama (synthesiser) , Briskard Kouadio (accoustic guitar) , Dallas, Briskard Kouadio (solo guitar) , Kouaho (percussion) , Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus) , Awa Diabate, Sanota Doumbie (chorus) , Ernest Mvouama
- Date: 2000
- Subjects: Popular music , Popular music--Africa, West , Africa Cote d'Ivoire Grand-Bassam f-ml
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/127518 , vital:36019 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDCO4-04
- Description: Ivorian band with solo and chorus, accompained by synthesier, guitars and percussion
- Full Text: false
- Date Issued: 2000
- Authors: Betika (composer, performer) , Ntoumba Minka (arranger, bass guitar)) , Ernest Mvouama (synthesiser) , Briskard Kouadio (accoustic guitar) , Dallas, Briskard Kouadio (solo guitar) , Kouaho (percussion) , Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus) , Awa Diabate, Sanota Doumbie (chorus) , Ernest Mvouama
- Date: 2000
- Subjects: Popular music , Popular music--Africa, West , Africa Cote d'Ivoire Grand-Bassam f-ml
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/127518 , vital:36019 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDCO4-04
- Description: Ivorian band with solo and chorus, accompained by synthesier, guitars and percussion
- Full Text: false
- Date Issued: 2000
Abissa
- Betika (composer, performer), Ntoumba Minka (arranger, bass guitar)), Ernest Mvouama (synthesiser), Briskard Kouadio (accoustic guitar), Dallas, Briskard Kouadio (accoustic guitar), Kouaho (percussion), Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus), Awa Diabate, Sanota Doumbie (chorus), Ernest Mvouama
- Authors: Betika (composer, performer) , Ntoumba Minka (arranger, bass guitar)) , Ernest Mvouama (synthesiser) , Briskard Kouadio (accoustic guitar) , Dallas, Briskard Kouadio (accoustic guitar) , Kouaho (percussion) , Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus) , Awa Diabate, Sanota Doumbie (chorus) , Ernest Mvouama
- Date: 2000
- Subjects: Popular music , Popular music--Africa, West , Africa Cote d'Ivoire Grand-Bassam f-ml
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/127484 , vital:36016 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDCO4-02
- Description: Singing accompanied by synthesiser, percussion, guitars
- Full Text: false
- Date Issued: 2000
- Authors: Betika (composer, performer) , Ntoumba Minka (arranger, bass guitar)) , Ernest Mvouama (synthesiser) , Briskard Kouadio (accoustic guitar) , Dallas, Briskard Kouadio (accoustic guitar) , Kouaho (percussion) , Donguy, Betuel, Ntoumba, Minka, Betika, Kouaho, Jean Gnanzou (chorus) , Awa Diabate, Sanota Doumbie (chorus) , Ernest Mvouama
- Date: 2000
- Subjects: Popular music , Popular music--Africa, West , Africa Cote d'Ivoire Grand-Bassam f-ml
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/127484 , vital:36016 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDCO4-02
- Description: Singing accompanied by synthesiser, percussion, guitars
- Full Text: false
- Date Issued: 2000
The development of biological tools to aid in the genetic investigation of the black (Diceros bicornis) and white (Ceratotherium simum) rhinoceros mitochondrial genomes
- Authors: Parsons, Michelle
- Date: 2015
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/56059 , vital:26769
- Description: The black (Diceros bicornis) and white (Ceratotherium simum) rhinoceros are found in South Africa. A decline in the populations of these species has resulted due to human activities such as habitat fragmentation and poaching. This has contributed to the loss of genetic diversity amongst the black and white rhinoceros. Conservation and anti-poaching efforts are needed to help maintain genetic diversity. These efforts could be improved through the development of non-invasive techniques to examine DNA from threatened animals. The aim of this research was to develop a molecular technique which would allow for the identification of the black and white rhinoceros and to develop a molecular technique which would allow for intraspecies genetic variation to be examined. DNA extractions were performed on matched faecal and tissue samples that were collected from two regions in South Africa. Polymerase chain reaction (PCR) primer sets were designed to investigate several regions of the rhinoceros mitochondrial genome. PCR optimisation was completed for the target regions. Sequencing was conducted on all final PCR products. The cytochrome c oxidase subunit 1 (COIi) gene allowed for the rhinoceros family to be identified. This region was digested with the HindIII restriction enzyme, which allowed for the specific identification of either the black or white rhinoceros. A subsequent region of the cytochrome c oxidase subunit 1 (COIii) as well as the D-loop, hypervariable regions (HV1 and HV2), cytochrome b (cytb) and 16s rRNA regions were investigated. These regions displayed potential for establishing geographic origin for black rhinoceros samples, whereas the D-loop and HV2 show potential for the white rhinoceros. The white rhinoceros displayed sequence variation in the HV2 and cytb region, while variation was observed in the COIi and HV1 for the black rhinoceros. All investigated target regions allowed for the rhinoceros family to be identified. The COI (COIi and COIii), HV2 and cytb regions allowed for the subspecies of rhinoceros to be identified, however the D-loop was not able to identify the white rhinoceros species. The 16s rRNA and HV1 regions allowed for the correct subspecies of rhinoceros to be identified, however as the primers were only compatible for the black rhinoceros therefore a subsequent investigation is required for the white rhinoceros. The establishment of this novel PCR based technique to identify white and black rhinoceros will allow for efficient species identification in wildlife forensic cases. A biological method was established to study intraspecies variation for the white and black rhinoceros; however the investigated target regions did not yield sufficient genetic variation. The core techniques developed in this study will be valuable for future studies that wish to investigate genetic variation in mammal species.
- Full Text:
- Date Issued: 2015
- Authors: Parsons, Michelle
- Date: 2015
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/56059 , vital:26769
- Description: The black (Diceros bicornis) and white (Ceratotherium simum) rhinoceros are found in South Africa. A decline in the populations of these species has resulted due to human activities such as habitat fragmentation and poaching. This has contributed to the loss of genetic diversity amongst the black and white rhinoceros. Conservation and anti-poaching efforts are needed to help maintain genetic diversity. These efforts could be improved through the development of non-invasive techniques to examine DNA from threatened animals. The aim of this research was to develop a molecular technique which would allow for the identification of the black and white rhinoceros and to develop a molecular technique which would allow for intraspecies genetic variation to be examined. DNA extractions were performed on matched faecal and tissue samples that were collected from two regions in South Africa. Polymerase chain reaction (PCR) primer sets were designed to investigate several regions of the rhinoceros mitochondrial genome. PCR optimisation was completed for the target regions. Sequencing was conducted on all final PCR products. The cytochrome c oxidase subunit 1 (COIi) gene allowed for the rhinoceros family to be identified. This region was digested with the HindIII restriction enzyme, which allowed for the specific identification of either the black or white rhinoceros. A subsequent region of the cytochrome c oxidase subunit 1 (COIii) as well as the D-loop, hypervariable regions (HV1 and HV2), cytochrome b (cytb) and 16s rRNA regions were investigated. These regions displayed potential for establishing geographic origin for black rhinoceros samples, whereas the D-loop and HV2 show potential for the white rhinoceros. The white rhinoceros displayed sequence variation in the HV2 and cytb region, while variation was observed in the COIi and HV1 for the black rhinoceros. All investigated target regions allowed for the rhinoceros family to be identified. The COI (COIi and COIii), HV2 and cytb regions allowed for the subspecies of rhinoceros to be identified, however the D-loop was not able to identify the white rhinoceros species. The 16s rRNA and HV1 regions allowed for the correct subspecies of rhinoceros to be identified, however as the primers were only compatible for the black rhinoceros therefore a subsequent investigation is required for the white rhinoceros. The establishment of this novel PCR based technique to identify white and black rhinoceros will allow for efficient species identification in wildlife forensic cases. A biological method was established to study intraspecies variation for the white and black rhinoceros; however the investigated target regions did not yield sufficient genetic variation. The core techniques developed in this study will be valuable for future studies that wish to investigate genetic variation in mammal species.
- Full Text:
- Date Issued: 2015
Fungal remediation of winery and distillery wastewaters using Trametes pubescens MB 89 and the enhanced production of a high-value enzyme therein
- Authors: Strong, Peter James
- Date: 2008
- Subjects: Fungal remediation Distilleries -- Waste disposal Wine and wine making -- Waste disposal Bioremediation Laccase Enzymes -- Biotechnology
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3932 , http://hdl.handle.net/10962/d1003991
- Description: In this study white-rot fungi were investigated for their efficiency at distillery wastewater remediation and the production of laccase as a valuable by-product. Distillery wastewaters are high in organic load and low in pH. The presence of phenolic compounds can lead to extremely colour-rich wastewaters and can be toxic to microorganisms. The presence of the inorganic ions may also affect biological treatment. White-rot fungi are unique among eukaryotic or prokaryotic microbes in possessing powerful oxidative enzyme systems that can degrade lignin to carbon dioxide. These ligninolytic enzymes, such as lignin peroxidase, manganese peroxidase and laccase, are capable of degrading a vast range of toxic, recalcitrant environmental pollutants and this makes the white-rot fungi strong candidates for the bioremediation of polluted soils and waters. The laccase enzyme alone has shown remediation potential in wastewaters such as beer production effluent, olive mill wastewater, alcohol distillery wastes, dye-containing wastewaters from the textile industry as well as wastewaters from the paper and pulp industry. It has been shown to be capable of remediating soils and waters polluted with chlorinated phenolic compounds, polyaromatic hydrocarbons, nitrosubstituted compounds and fungicides, herbicides and insecticides.
- Full Text:
- Date Issued: 2008
- Authors: Strong, Peter James
- Date: 2008
- Subjects: Fungal remediation Distilleries -- Waste disposal Wine and wine making -- Waste disposal Bioremediation Laccase Enzymes -- Biotechnology
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3932 , http://hdl.handle.net/10962/d1003991
- Description: In this study white-rot fungi were investigated for their efficiency at distillery wastewater remediation and the production of laccase as a valuable by-product. Distillery wastewaters are high in organic load and low in pH. The presence of phenolic compounds can lead to extremely colour-rich wastewaters and can be toxic to microorganisms. The presence of the inorganic ions may also affect biological treatment. White-rot fungi are unique among eukaryotic or prokaryotic microbes in possessing powerful oxidative enzyme systems that can degrade lignin to carbon dioxide. These ligninolytic enzymes, such as lignin peroxidase, manganese peroxidase and laccase, are capable of degrading a vast range of toxic, recalcitrant environmental pollutants and this makes the white-rot fungi strong candidates for the bioremediation of polluted soils and waters. The laccase enzyme alone has shown remediation potential in wastewaters such as beer production effluent, olive mill wastewater, alcohol distillery wastes, dye-containing wastewaters from the textile industry as well as wastewaters from the paper and pulp industry. It has been shown to be capable of remediating soils and waters polluted with chlorinated phenolic compounds, polyaromatic hydrocarbons, nitrosubstituted compounds and fungicides, herbicides and insecticides.
- Full Text:
- Date Issued: 2008
The use of Landsat ETM imagery as a suitable data capture source for alien acacia species for the WFW programme
- Authors: Cobbing, Benedict Louis
- Date: 2007
- Subjects: Geographic information systems , Global Positioning System , Landsat satellites , Agriculture -- Remote sensing , Geography -- Remote sensing
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4856 , http://hdl.handle.net/10962/d1005532 , Geographic information systems , Global Positioning System , Landsat satellites , Agriculture -- Remote sensing , Geography -- Remote sensing
- Description: Geographic Information System technology today allows for the rapid analysis of vast amounts of spatial and non-spatial data. The power of a GIS can only be effected with the rapid collection of accurate input data. This is particularly true in the case of the South African National Working for Water (WFW) Programme where large volumes of spatial data on alien vegetation infestations are captured throughout the country. Alien vegetation clearing contracts cannot be generated, for WFW, without this data, so that the accurate capture of such data is crucial to the success of the programme. Mapping Invasive Alien Plant (IAP) data within WFW is a perennial problem (Coetzee, pers com, 2002), because not enough mapping is being done to meet the annual requirements of the programme in the various provinces. This is re-iterated by Richardson, 2004, who states that there is a shortage of accurate data on IAP abundance in South Africa. Therefore there is a need to investigate alternate methods of data capture; such as remote sensing, whilst working within the existing WFW data capture standards. The aim of this research was to investigate the use of Landsat ETM imagery as a data capture source for mapping alien vegetation for the WFW Programme in terms of their approved mapping methods, for both automated and manual classification techniques. The automated and manual classification results were compared to control data captured by differential Global Positioning Systems (DGPS). The research tested the various methods of data capture using Landsat ETM images over a range of study sites of varying complexity: a simple grassland area, a medium complexity grassy fynbos site and a complicated indigenous forest site. An important component of the research was to develop a mapping (classification) Ranking System based upon variables identified by WFW as fundamental in data capture decision making: spatial and positional accuracy, time constraints and cost constraints for three typical alien invaded areas. The mapping Ranking System compared the results of the various mapping methods for each factor for the study sites against each other. This provided an indication of which mapping method is the most efficient or suitable for a particular area.
- Full Text:
- Date Issued: 2007
- Authors: Cobbing, Benedict Louis
- Date: 2007
- Subjects: Geographic information systems , Global Positioning System , Landsat satellites , Agriculture -- Remote sensing , Geography -- Remote sensing
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4856 , http://hdl.handle.net/10962/d1005532 , Geographic information systems , Global Positioning System , Landsat satellites , Agriculture -- Remote sensing , Geography -- Remote sensing
- Description: Geographic Information System technology today allows for the rapid analysis of vast amounts of spatial and non-spatial data. The power of a GIS can only be effected with the rapid collection of accurate input data. This is particularly true in the case of the South African National Working for Water (WFW) Programme where large volumes of spatial data on alien vegetation infestations are captured throughout the country. Alien vegetation clearing contracts cannot be generated, for WFW, without this data, so that the accurate capture of such data is crucial to the success of the programme. Mapping Invasive Alien Plant (IAP) data within WFW is a perennial problem (Coetzee, pers com, 2002), because not enough mapping is being done to meet the annual requirements of the programme in the various provinces. This is re-iterated by Richardson, 2004, who states that there is a shortage of accurate data on IAP abundance in South Africa. Therefore there is a need to investigate alternate methods of data capture; such as remote sensing, whilst working within the existing WFW data capture standards. The aim of this research was to investigate the use of Landsat ETM imagery as a data capture source for mapping alien vegetation for the WFW Programme in terms of their approved mapping methods, for both automated and manual classification techniques. The automated and manual classification results were compared to control data captured by differential Global Positioning Systems (DGPS). The research tested the various methods of data capture using Landsat ETM images over a range of study sites of varying complexity: a simple grassland area, a medium complexity grassy fynbos site and a complicated indigenous forest site. An important component of the research was to develop a mapping (classification) Ranking System based upon variables identified by WFW as fundamental in data capture decision making: spatial and positional accuracy, time constraints and cost constraints for three typical alien invaded areas. The mapping Ranking System compared the results of the various mapping methods for each factor for the study sites against each other. This provided an indication of which mapping method is the most efficient or suitable for a particular area.
- Full Text:
- Date Issued: 2007
3-Methyl-1-phenyl-4-[(phenyl)(2-phenylhydrazin-1-yl)methylidene]-1H-pyrazol-5(4H)-one
- Identifier: http://vital.seals.ac.za8080/10353/7489 , http://hdl.handle.net/10353/5328 , vital:29192
- Full Text:
- Identifier: http://vital.seals.ac.za8080/10353/7489 , http://hdl.handle.net/10353/5328 , vital:29192
- Full Text:
Academic literacy in management education
- Pearse, Noel J, Amos, Trevor L
- Authors: Pearse, Noel J , Amos, Trevor L
- Date: 2000
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/270065 , vital:54392 , xlink:href="https://hdl.handle.net/10520/EJC36783"
- Description: Although management education aims to equip students with relevant knowledge, skills and competencies, making explicit and developing the cognitive thought processes necessary for management students to deal effectively with the current and future demands of the world of work, have been neglected. This article argues for the development of "complicated understanding" (Bartunek, Gordon and Weathersby 1983) in management students, through cultivating academic literacy. Using mediation, reflective inquiry and reflective writing interactively, it is illustrated how academic literacy could be promoted at the post-graduate level.
- Full Text:
- Date Issued: 2000
- Authors: Pearse, Noel J , Amos, Trevor L
- Date: 2000
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/270065 , vital:54392 , xlink:href="https://hdl.handle.net/10520/EJC36783"
- Description: Although management education aims to equip students with relevant knowledge, skills and competencies, making explicit and developing the cognitive thought processes necessary for management students to deal effectively with the current and future demands of the world of work, have been neglected. This article argues for the development of "complicated understanding" (Bartunek, Gordon and Weathersby 1983) in management students, through cultivating academic literacy. Using mediation, reflective inquiry and reflective writing interactively, it is illustrated how academic literacy could be promoted at the post-graduate level.
- Full Text:
- Date Issued: 2000
Behavioural interactions of predators and spawning chokka squid off South Africa: towards quantification
- Smale, Malcolm J, Sauer, Warwick H H, Roberts, M
- Authors: Smale, Malcolm J , Sauer, Warwick H H , Roberts, M
- Date: 2001
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/123921 , vital:35516 , https://doi.10.1007/s002270100664
- Description: The interaction of a suite of predators with mating and spawning chokka squid (Loligo vulgaris reynaudii) was studied at inshore (<50 m) spawning grounds off South Africa. This study provides the first detailed records of predator–prey interactions of squids on their spawning grounds and is the first attempt to time disruptions caused by predators to the egg-laying behaviour of squids, thereby quantifying the perceived threat to the prey. The squids are focused on mate choice and reproduction while they aggregate over egg beds and they may be more vulnerable to predation than at other times. Their vulnerability to different predators in the field is examined and the tactics used against different predatory species are illustrated using recordings made with underwater video cameras. Predators recorded included two cephalopods (Octopus vulgaris and L. v. reynaudii), five teleosts (Pagellus bellotii natalensis, Spondyliosoma emarginatum, Pachymetopon aeneum, Cheimerius nufar and Pomatomus saltatrix), seven chondrichthyians (Squalus megalops, Mustelus mustelus, Carcharias taurus, Dasyatis brevicaudata, Gymnura natalensis, Poroderma africanum and P. pantherinum) and three marine mammals (Arctocephalus puscillus, Tursiops aduncus and Delphinus delphis). Analysis of behavioural interactions between predators and prey showed that predator disruption of egg laying may be quantified in terms of time. Marine mammals caused the most acute disruption, whereas other taxa had more chronic disruption effects because they spent more time on the spawning grounds. During November 1995, the suite of predators changed during the course of a 2-day period of underwater video recording, possibly because of an increase in water temperature. The hypothesis that predators would be concentrated around a spawning aggregation was tested by surveying the spawning ground using an underwater camera towed by a boat navigating with differential GPS. The results supported the hypothesis because predators were located only around the spawning sites. The serial spawning of chokka squids in recently upwelled water may reduce predation pressure. Furthermore, it may be difficult for predators to predict the specific spawning site on a particular day because squids disperse away from egg beds at night and use numerous spawning sites along the coast.
- Full Text:
- Date Issued: 2001
- Authors: Smale, Malcolm J , Sauer, Warwick H H , Roberts, M
- Date: 2001
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/123921 , vital:35516 , https://doi.10.1007/s002270100664
- Description: The interaction of a suite of predators with mating and spawning chokka squid (Loligo vulgaris reynaudii) was studied at inshore (<50 m) spawning grounds off South Africa. This study provides the first detailed records of predator–prey interactions of squids on their spawning grounds and is the first attempt to time disruptions caused by predators to the egg-laying behaviour of squids, thereby quantifying the perceived threat to the prey. The squids are focused on mate choice and reproduction while they aggregate over egg beds and they may be more vulnerable to predation than at other times. Their vulnerability to different predators in the field is examined and the tactics used against different predatory species are illustrated using recordings made with underwater video cameras. Predators recorded included two cephalopods (Octopus vulgaris and L. v. reynaudii), five teleosts (Pagellus bellotii natalensis, Spondyliosoma emarginatum, Pachymetopon aeneum, Cheimerius nufar and Pomatomus saltatrix), seven chondrichthyians (Squalus megalops, Mustelus mustelus, Carcharias taurus, Dasyatis brevicaudata, Gymnura natalensis, Poroderma africanum and P. pantherinum) and three marine mammals (Arctocephalus puscillus, Tursiops aduncus and Delphinus delphis). Analysis of behavioural interactions between predators and prey showed that predator disruption of egg laying may be quantified in terms of time. Marine mammals caused the most acute disruption, whereas other taxa had more chronic disruption effects because they spent more time on the spawning grounds. During November 1995, the suite of predators changed during the course of a 2-day period of underwater video recording, possibly because of an increase in water temperature. The hypothesis that predators would be concentrated around a spawning aggregation was tested by surveying the spawning ground using an underwater camera towed by a boat navigating with differential GPS. The results supported the hypothesis because predators were located only around the spawning sites. The serial spawning of chokka squids in recently upwelled water may reduce predation pressure. Furthermore, it may be difficult for predators to predict the specific spawning site on a particular day because squids disperse away from egg beds at night and use numerous spawning sites along the coast.
- Full Text:
- Date Issued: 2001
Synthesis, characterization, and biological studies of pyrazolone Schiff bases and their transition metal complexes
- Authors: Idemudia, Omoruyi Gold
- Date: 2014
- Language: English
- Type: Thesis , Doctoral , PhD (Chemistry)
- Identifier: vital:11340 , http://hdl.handle.net/10353/d1016068
- Description: Some new acylpyrazolone Schiff bases have been synthesized from the condensation reaction of two acylpyrazolone diketone precursors with phenylhydrazine, 2,4-dinitrophenylhydrazine and sulfanilamide. They have been fully characterized by elemental analysis and spectroscopic techniques (IR,1H and 13C NMR, and mass-spectra). The single crystal structure of the benzoyl derivative acylpyrazolone Schiff bases have been obtained and analyzed by X-ray crystallography technique. Solid state X-ray diffraction revealed a keto tautomer Schiff base in solid state. Mn(II), Co(II), Ni(II) and Cu(II) complexes with the Schiff bases have been synthesized and characterized by elemental analysis, IR and UV-VIS spectroscopy, magnetic susceptibility measurements, and thermal studies (TGA and DTG). An octahedral geometry around the transition metal ion, consisting of two bidentate Schiff base ligands bonding through the azometine nitrogen and ketonic oxygen have been proposed based on careful interpretation of available analytical and spectroscopic characterization results. Two water molecules as ligands complete the octahedral geometry in all cases. Using the invitro disc diffusion method for screening synthesized compounds against selected gram positive and gram negative bacterial at 40 mg/mL, and the DPPH free radical scavenging methods at 0.50, 0.25 and 0.13 mg/mL, the synthesized Schiff base and metal complexes showed varying biological activities. 4-benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-one sul29 fanilamide showed more activity generally, exhibiting a broad spectrum activity against all selected bacterial in some cases. Mn(II), Co(II) and Ni(II) complexes of sulfanilamide Schiff base with the acetylpyrazolone derivative 4-acetyl-3-methyl-1-phenyl-2-pyrazolin-5-one sulfanilamide, exhibited a stronger and very good DPPH radical scavenging activity as good as ascorbic acid on comparing, but not with Cu(II). As such they could be important antitumour candidates.
- Full Text:
- Date Issued: 2014
- Authors: Idemudia, Omoruyi Gold
- Date: 2014
- Language: English
- Type: Thesis , Doctoral , PhD (Chemistry)
- Identifier: vital:11340 , http://hdl.handle.net/10353/d1016068
- Description: Some new acylpyrazolone Schiff bases have been synthesized from the condensation reaction of two acylpyrazolone diketone precursors with phenylhydrazine, 2,4-dinitrophenylhydrazine and sulfanilamide. They have been fully characterized by elemental analysis and spectroscopic techniques (IR,1H and 13C NMR, and mass-spectra). The single crystal structure of the benzoyl derivative acylpyrazolone Schiff bases have been obtained and analyzed by X-ray crystallography technique. Solid state X-ray diffraction revealed a keto tautomer Schiff base in solid state. Mn(II), Co(II), Ni(II) and Cu(II) complexes with the Schiff bases have been synthesized and characterized by elemental analysis, IR and UV-VIS spectroscopy, magnetic susceptibility measurements, and thermal studies (TGA and DTG). An octahedral geometry around the transition metal ion, consisting of two bidentate Schiff base ligands bonding through the azometine nitrogen and ketonic oxygen have been proposed based on careful interpretation of available analytical and spectroscopic characterization results. Two water molecules as ligands complete the octahedral geometry in all cases. Using the invitro disc diffusion method for screening synthesized compounds against selected gram positive and gram negative bacterial at 40 mg/mL, and the DPPH free radical scavenging methods at 0.50, 0.25 and 0.13 mg/mL, the synthesized Schiff base and metal complexes showed varying biological activities. 4-benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-one sul29 fanilamide showed more activity generally, exhibiting a broad spectrum activity against all selected bacterial in some cases. Mn(II), Co(II) and Ni(II) complexes of sulfanilamide Schiff base with the acetylpyrazolone derivative 4-acetyl-3-methyl-1-phenyl-2-pyrazolin-5-one sulfanilamide, exhibited a stronger and very good DPPH radical scavenging activity as good as ascorbic acid on comparing, but not with Cu(II). As such they could be important antitumour candidates.
- Full Text:
- Date Issued: 2014
Jesusa uetu etumonena
- 4 Men and 5 Ladies, Ovambo Folk, Betuel, Selma, Mutota, Penehafo, Dargie, Dave
- Authors: 4 Men and 5 Ladies , Ovambo Folk , Betuel, Selma , Mutota, Penehafo , Dargie, Dave
- Date: 1982-11-02
- Subjects: Choral music , Field recordings , Africa, Sub-Saharan , Africa Namibia Oshikuku f-sx
- Language: Kuanyama, Kwanyama
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/278386 , vital:55383 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDD058-02
- Description: Indigenous music.
- Full Text: false
- Date Issued: 1982-11-02
- Authors: 4 Men and 5 Ladies , Ovambo Folk , Betuel, Selma , Mutota, Penehafo , Dargie, Dave
- Date: 1982-11-02
- Subjects: Choral music , Field recordings , Africa, Sub-Saharan , Africa Namibia Oshikuku f-sx
- Language: Kuanyama, Kwanyama
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/278386 , vital:55383 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDD058-02
- Description: Indigenous music.
- Full Text: false
- Date Issued: 1982-11-02
Ave Maria
- Ovambo Folk, Betuel, Selma, Dargie, Dave
- Authors: Ovambo Folk , Betuel, Selma , Dargie, Dave
- Date: 1982-11-04
- Subjects: Choral music , Field recordings , Africa, Sub-Saharan , Africa Namibia Oshikuku f-sx
- Language: Kuanyama, Kwanyama
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/279480 , vital:55505 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDD058-35
- Description: Indigenous music.
- Full Text: false
- Date Issued: 1982-11-04
- Authors: Ovambo Folk , Betuel, Selma , Dargie, Dave
- Date: 1982-11-04
- Subjects: Choral music , Field recordings , Africa, Sub-Saharan , Africa Namibia Oshikuku f-sx
- Language: Kuanyama, Kwanyama
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/279480 , vital:55505 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDD058-35
- Description: Indigenous music.
- Full Text: false
- Date Issued: 1982-11-04
Ave Maria
- Ovambo Folk, Betuel, Selma, Dargie, Dave
- Authors: Ovambo Folk , Betuel, Selma , Dargie, Dave
- Date: 1982-11-04
- Subjects: Choral music , Field recordings , Africa, Sub-Saharan , Africa Namibia Oshikuku f-sx
- Language: Kuanyama, Kwanyama
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/279459 , vital:55504 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDD058-34
- Description: Indigenous music.
- Full Text: false
- Date Issued: 1982-11-04
- Authors: Ovambo Folk , Betuel, Selma , Dargie, Dave
- Date: 1982-11-04
- Subjects: Choral music , Field recordings , Africa, Sub-Saharan , Africa Namibia Oshikuku f-sx
- Language: Kuanyama, Kwanyama
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/279459 , vital:55504 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDD058-34
- Description: Indigenous music.
- Full Text: false
- Date Issued: 1982-11-04
The synthesis, empirical and theoretical studies of various (N→B) diarylborinate esters
- Authors: Manana, Pholani Sakhile
- Date: 2021-12
- Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/53869 , vital:46027
- Description: A series of core-functionalized borinic acids was synthesized from Grignard reagents and tributylborate and reacted with ethanolamine, amino acids, 2-pyridylmethanol as well as 2-(ethyl amino ethanol). Among the borinic acids synthesized were the ones bearing: para-(2, 15, 16, 22, 27)-methyl, (3, 20, 25)-chloro, (4, 23, 26)-fluoro, (5)-methoxy; meta-(7, 17)-methyl, (9)-fluoro; ortho-(6)-methyl, (8)-chloro, (10, 18, 19)-methoxy substituents on their respective aromatic systems. All compounds obtained by condensation of the borinic acids with the aforementioned nitrogen-containing substrates were characterized structurally by means of diffraction studies based on single crystals and found to constitute chelate esters/amides featuring covalent B-O and dative N→B bonds. The chelate compounds researched in this study could be classified into four families and represent the compounds: ethanol amine: (1) 2,2-diphenyl-1,3,2-oxazaborolidines, (2) 2,2-bis(p-tolyl)-1,3,2-oxazaborolidines, (3) 2,2-bis(p-chlorophenyl)-1,3,2-oxazaborolidines, (4) 2,2-bis(p-fluorophenyl)-1,3,2-oxazaborolidines, (5) 2,2-bis(p-methoxyphenyl)-1,3,2-oxazaborolidines, (6) 2,2-bis(o-tolyl)-1,3,2-oxazaborolidines, (7) 2,2-bis(m-tolyl)-1,3,2-oxazaborolidines, (8) 2,2-bis(o-chlorophenyl)-1,3,2-oxazaborolidines, (9) 2,2-bis(m-fluorophenyl)-1,3,2-oxazaborolidines, (10) 2,2-bis(o-methoxyphenyl)-1,3,2-oxazaborolidines. α-amino acids : (14) 4-methyl-2,2-diphenyl-1,3,2-oxazaborolidin-5-ones, (15) 2,2-bis(p-tolyl)-1,3,2-oxazaborolidin-5-ones, (16) 4-methyl-2,2-bis(p-tolyl)-1,3,2-oxazaborolidin-5-ones, (17) 4-isopropyl-2,2-bis(m-tolyl)-1,3,2-oxazaborolidin-5-ones, (18) 4-methyl-2,2-bis(o-methoxyphenyl)-1,3,2- oxazaborolidin-5-ones, (19) 4-acetamidyl-2,2-bis(o-methoxyphenyl)-1,3,2- oxazaborolidin-5-ones, (20) 4-phenylethane-2,2-bis(p-chlorophenyl)-1,3,2 oxazaborolidin-5-ones. 2-pyridylmethanol: (21) 1,3-hydroxypyridyl-2,2-diphenyl 1,3,2-oxazaborolidines, (22) 1,3-hydroxypyridyl-2,2-bis(p-tolyl)-1,3,2-oxazaborolidines, (23) 1,3-hydroxypyridyl-2,2-bis(p-fluorophenyl)-1,3,2-oxazaborolidines 2-(ethyl amino ethanol): (24) 3-ethyl-2,2-diphenyl-1,3,2-oxazaborolidines, (25) 3-ethyl-2,2-bis(p-chlorophenyl)-1,3,2-oxazaborolidines, (26) 3-ethyl-2,2-bis(p-fluorophenyl)-1,3,2-oxazaborolidines, (27) 3-ethyl-2,2-bis(p-tolyl)-1,3,2-oxazaborolidines. Apart from structural studies in the solid state, the compounds were also characterized by means of multinuclear NMR spectroscopy (1H, 11B, 13C) as well as UV/vis and FTIR. The typical 11B resonances were found in the range of (4-10 ppm). A series of characteristic metrical parameters for the compounds in the solid state as well as typical NMR shifts for the chelate target molecules was established that allowed for the determination of the coordination induced shift. The carbon atom bonded to the oxygen atom shifted upfield, while the carbon atom bonded to the nitrogen atom shifted downfield. Factors mentioned in the literature that has an influence on the hydrolytic stability on the heterocyclic borinate motif have been taken into consideration and verified for the systems researched in this study. The substitution at the nitrogen atom with one ethyl group caused the greatest increases in the N→B bond length (27) 1.714 Å, due to the increase in the nitrogen Lewis basicity, making it the least hydrolytically stable, these include compounds (24-26). Furthermore, DFT calculations were performed by employing Becke’s three parameter hybrid exchange functional with Lee–Yang–Parr functional (B3LYP) method using the Gaussian 16 program package (Rev. B01) employing the basis set 6-311++G(d,p), to corroborate and correlate the experimental findings, which gave a general R-squared value of 0.9978 for calculated vs experimental 13C chemical shifts. Thermal properties are recorded for select compounds, indicating the ΔH and the melting points. , Thesis (PhD) -- Faculty of Science, School of Biomolecular and Chemical Sciences, 2021
- Full Text:
- Date Issued: 2021-12
- Authors: Manana, Pholani Sakhile
- Date: 2021-12
- Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/53869 , vital:46027
- Description: A series of core-functionalized borinic acids was synthesized from Grignard reagents and tributylborate and reacted with ethanolamine, amino acids, 2-pyridylmethanol as well as 2-(ethyl amino ethanol). Among the borinic acids synthesized were the ones bearing: para-(2, 15, 16, 22, 27)-methyl, (3, 20, 25)-chloro, (4, 23, 26)-fluoro, (5)-methoxy; meta-(7, 17)-methyl, (9)-fluoro; ortho-(6)-methyl, (8)-chloro, (10, 18, 19)-methoxy substituents on their respective aromatic systems. All compounds obtained by condensation of the borinic acids with the aforementioned nitrogen-containing substrates were characterized structurally by means of diffraction studies based on single crystals and found to constitute chelate esters/amides featuring covalent B-O and dative N→B bonds. The chelate compounds researched in this study could be classified into four families and represent the compounds: ethanol amine: (1) 2,2-diphenyl-1,3,2-oxazaborolidines, (2) 2,2-bis(p-tolyl)-1,3,2-oxazaborolidines, (3) 2,2-bis(p-chlorophenyl)-1,3,2-oxazaborolidines, (4) 2,2-bis(p-fluorophenyl)-1,3,2-oxazaborolidines, (5) 2,2-bis(p-methoxyphenyl)-1,3,2-oxazaborolidines, (6) 2,2-bis(o-tolyl)-1,3,2-oxazaborolidines, (7) 2,2-bis(m-tolyl)-1,3,2-oxazaborolidines, (8) 2,2-bis(o-chlorophenyl)-1,3,2-oxazaborolidines, (9) 2,2-bis(m-fluorophenyl)-1,3,2-oxazaborolidines, (10) 2,2-bis(o-methoxyphenyl)-1,3,2-oxazaborolidines. α-amino acids : (14) 4-methyl-2,2-diphenyl-1,3,2-oxazaborolidin-5-ones, (15) 2,2-bis(p-tolyl)-1,3,2-oxazaborolidin-5-ones, (16) 4-methyl-2,2-bis(p-tolyl)-1,3,2-oxazaborolidin-5-ones, (17) 4-isopropyl-2,2-bis(m-tolyl)-1,3,2-oxazaborolidin-5-ones, (18) 4-methyl-2,2-bis(o-methoxyphenyl)-1,3,2- oxazaborolidin-5-ones, (19) 4-acetamidyl-2,2-bis(o-methoxyphenyl)-1,3,2- oxazaborolidin-5-ones, (20) 4-phenylethane-2,2-bis(p-chlorophenyl)-1,3,2 oxazaborolidin-5-ones. 2-pyridylmethanol: (21) 1,3-hydroxypyridyl-2,2-diphenyl 1,3,2-oxazaborolidines, (22) 1,3-hydroxypyridyl-2,2-bis(p-tolyl)-1,3,2-oxazaborolidines, (23) 1,3-hydroxypyridyl-2,2-bis(p-fluorophenyl)-1,3,2-oxazaborolidines 2-(ethyl amino ethanol): (24) 3-ethyl-2,2-diphenyl-1,3,2-oxazaborolidines, (25) 3-ethyl-2,2-bis(p-chlorophenyl)-1,3,2-oxazaborolidines, (26) 3-ethyl-2,2-bis(p-fluorophenyl)-1,3,2-oxazaborolidines, (27) 3-ethyl-2,2-bis(p-tolyl)-1,3,2-oxazaborolidines. Apart from structural studies in the solid state, the compounds were also characterized by means of multinuclear NMR spectroscopy (1H, 11B, 13C) as well as UV/vis and FTIR. The typical 11B resonances were found in the range of (4-10 ppm). A series of characteristic metrical parameters for the compounds in the solid state as well as typical NMR shifts for the chelate target molecules was established that allowed for the determination of the coordination induced shift. The carbon atom bonded to the oxygen atom shifted upfield, while the carbon atom bonded to the nitrogen atom shifted downfield. Factors mentioned in the literature that has an influence on the hydrolytic stability on the heterocyclic borinate motif have been taken into consideration and verified for the systems researched in this study. The substitution at the nitrogen atom with one ethyl group caused the greatest increases in the N→B bond length (27) 1.714 Å, due to the increase in the nitrogen Lewis basicity, making it the least hydrolytically stable, these include compounds (24-26). Furthermore, DFT calculations were performed by employing Becke’s three parameter hybrid exchange functional with Lee–Yang–Parr functional (B3LYP) method using the Gaussian 16 program package (Rev. B01) employing the basis set 6-311++G(d,p), to corroborate and correlate the experimental findings, which gave a general R-squared value of 0.9978 for calculated vs experimental 13C chemical shifts. Thermal properties are recorded for select compounds, indicating the ΔH and the melting points. , Thesis (PhD) -- Faculty of Science, School of Biomolecular and Chemical Sciences, 2021
- Full Text:
- Date Issued: 2021-12
A study of a class of invariant optimal control problems on the Euclidean group SE(2)
- Authors: Adams, Ross Montague
- Date: 2011
- Subjects: Matrix groups Lie groups Extremal problems (Mathematics) Maximum principles (Mathematics) Hamilton-Jacobi equations Lyapunov stability
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5420 , http://hdl.handle.net/10962/d1006060
- Description: The aim of this thesis is to study a class of left-invariant optimal control problems on the matrix Lie group SE(2). We classify, under detached feedback equivalence, all controllable (left-invariant) control affine systems on SE(2). This result produces six types of control affine systems on SE(2). Hence, we study six associated left-invariant optimal control problems on SE(2). A left-invariant optimal control problem consists of minimizing a cost functional over the trajectory-control pairs of a left-invariant control system subject to appropriate boundary conditions. Each control problem is lifted from SE(2) to T*SE(2) ≅ SE(2) x se (2)*and then reduced to a problem on se (2)*. The maximum principle is used to obtain the optimal control and Hamiltonian corresponding to the normal extremals. Then we derive the (reduced) extremal equations on se (2)*. These equations are explicitly integrated by trigonometric and Jacobi elliptic functions. Finally, we fully classify, under Lyapunov stability, the equilibrium states of the normal extremal equations for each of the six types under consideration.
- Full Text:
- Date Issued: 2011
- Authors: Adams, Ross Montague
- Date: 2011
- Subjects: Matrix groups Lie groups Extremal problems (Mathematics) Maximum principles (Mathematics) Hamilton-Jacobi equations Lyapunov stability
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5420 , http://hdl.handle.net/10962/d1006060
- Description: The aim of this thesis is to study a class of left-invariant optimal control problems on the matrix Lie group SE(2). We classify, under detached feedback equivalence, all controllable (left-invariant) control affine systems on SE(2). This result produces six types of control affine systems on SE(2). Hence, we study six associated left-invariant optimal control problems on SE(2). A left-invariant optimal control problem consists of minimizing a cost functional over the trajectory-control pairs of a left-invariant control system subject to appropriate boundary conditions. Each control problem is lifted from SE(2) to T*SE(2) ≅ SE(2) x se (2)*and then reduced to a problem on se (2)*. The maximum principle is used to obtain the optimal control and Hamiltonian corresponding to the normal extremals. Then we derive the (reduced) extremal equations on se (2)*. These equations are explicitly integrated by trigonometric and Jacobi elliptic functions. Finally, we fully classify, under Lyapunov stability, the equilibrium states of the normal extremal equations for each of the six types under consideration.
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- Date Issued: 2011