title: Minimizing side reactions in chemoenzymatic dynamic kinetic resolution: organometallic and material strategies

authors: Pollock, Ciara L.

abstract: Chemoenzymatic dynamic kinetic resolution (DKR) of rac-1-phenyl ethanol into R-1-phenylethanol acetate was investigated with emphasis on the minimization of side reactions. The organometallic hydrogen transfer (racemization) catalyst was varied, and this was observed to alter the rate and extent of oxidation of the alcohol to form ketone side products. The performance of highly active catalyst [(pentamethylcyclopentadienyl)IrCl₂(1-benzyl,3-methyl-imidazol-2-ylidene)] was found to depend on the batch of lipase B used. The interaction between the bio- and chemo-catalysts was reduced by employing physical entrapment of the enzyme in silica using a sol–gel process. The nature of the gelation method was found to be important, with an alkaline method preferred, as an acidic method was found to initiate a further side reaction, the acid catalyzed dehydration of the secondary alcohol. The acidic gel was found to be a heterogeneous solid acid.

text: Minimizing side reactions in chemoenzymatic dynamic kinetic resolution: organometallic and material strategies Chemoenzymatic dynamic kinetic resolution (DKR) of rac-1-phenyl ethanol into R-1-phenylethanol acetate was investigated with emphasis on the minimization of side reactions. The organometallic hydrogen transfer (racemization) catalyst was varied, and this was observed to alter the rate and extent of oxidation of the alcohol to form ketone side products. The performance of highly active catalyst [(pentamethylcyclopentadienyl)IrCl₂(1-benzyl,3-methyl-imidazol-2-ylidene)] was found to depend on the batch of lipase B used. The interaction between the bio- and chemo-catalysts was reduced by employing physical entrapment of the enzyme in silica using a sol–gel process. The nature of the gelation method was found to be important, with an alkaline method preferred, as an acidic method was found to initiate a further side reaction, the acid catalyzed dehydration of the secondary alcohol. The acidic gel was found to be a heterogeneous solid acid.

year: 2012

title: Recent studies of sediment capping and flocculation for nutrient stabilisation

authors: Özkundakci, Deniz

subjects: New Zealand

abstract: Water quality in the Rotorua Lakes has declined in the past 30 to 40 years due to increasing nutrient loads, specifically nitrogen and phosphorus. In situ restoration techniques, including sediment capping and flocculation, have been developed to attempt to reduce internal nutrient loads, which can be comparable in magnitude to external loads in eutrophic lakes. The aim of this report is to summarise the current state of knowledge, and to documents some recent studies of sediment capping and flocculation techniques designed to remove nutrients from the water column by retaining them permanently within the bottom sediments. Experimental set-ups for testing the efficacy of different materials range from conventional batch adsorption studies to sediment reactor experiments. Natural ecosystems have also been simulated with mesocosms in Lake Okaro. A full scale application of aluminium sulphate (alum) in Lake Okar. A full scale application of aluminium sulphate (alum) in Lake Okaro has also been intensively monitored. The different studies have provided information on the restoration potential of some sediment capping agents and flocculants, but many questions still remain. Given the current state of knowledge it is not possible to confirm a priori the circumstances under which a whole lake trial would be successful. Future research should be carried out on the follow foci:
•	Establishment of chronic or acute toxic effects of the adsorbent materials.
•	Effect of treatment applications on benthic biota, particularly capping materials that may alter physical characteristics of the sediments.
•	Application of computer models for the purpose of both hindcasting and better understanding effects of application of an adsorbent to a lake, and for the purpose of predicting the changes in trophic status.
•	Application techniques and costs, particularly in view of potential for quite radical changes in source of adsorbent materials, grain sizes and methods of application for a single adsorbent.

text: Recent studies of sediment capping and flocculation for nutrient stabilisation Water quality in the Rotorua Lakes has declined in the past 30 to 40 years due to increasing nutrient loads, specifically nitrogen and phosphorus. In situ restoration techniques, including sediment capping and flocculation, have been developed to attempt to reduce internal nutrient loads, which can be comparable in magnitude to external loads in eutrophic lakes. The aim of this report is to summarise the current state of knowledge, and to documents some recent studies of sediment capping and flocculation techniques designed to remove nutrients from the water column by retaining them permanently within the bottom sediments. Experimental set-ups for testing the efficacy of different materials range from conventional batch adsorption studies to sediment reactor experiments. Natural ecosystems have also been simulated with mesocosms in Lake Okaro. A full scale application of aluminium sulphate (alum) in Lake Okar. A full scale application of aluminium sulphate (alum) in Lake Okaro has also been intensively monitored. The different studies have provided information on the restoration potential of some sediment capping agents and flocculants, but many questions still remain. Given the current state of knowledge it is not possible to confirm a priori the circumstances under which a whole lake trial would be successful. Future research should be carried out on the follow foci:
•	Establishment of chronic or acute toxic effects of the adsorbent materials.
•	Effect of treatment applications on benthic biota, particularly capping materials that may alter physical characteristics of the sediments.
•	Application of computer models for the purpose of both hindcasting and better understanding effects of application of an adsorbent to a lake, and for the purpose of predicting the changes in trophic status.
•	Application techniques and costs, particularly in view of potential for quite radical changes in source of adsorbent materials, grain sizes and methods of application for a single adsorbent.

year: 2006

title: Kua takoto te maanuka: Te tiimatanga o teetahi Kura Kaupapa Maaori

authors: Douglas, Vianney Gaye

subjects: Kura Kaupapa Maori

abstract: There is a paucity of literature on the establishment of new schools, and more particularly, the establishment of Kura Kaupapa Maaori. In addition, there is even less literature concerning the experiences and perspectives of whaanau and hapuu within Kaupapa Maaori initiatives. 

This thesis, therefore, illustrates the experience of a whaanau in the establishment of their Kura Kaupapa Maaori. The assertion within this thesis is that there are unique issues and challenges that Maaori communities encounter when pursuing the establishment of a Kura Kaupapa Maaori. Furthermore, a key factor in the success of establishing and sustaining the school is in the leadership.

Thus, the cognisance of Kaupapa Maaori and the development of Kura Kaupapa Maaori are explored. In addition, the key characteristics, roles and responsibilities of Maaori leadership both within the wider community and within schools are explored.

This case study included an interview with the Principal, and several focus group interviews with parents, staff and students of the new Kura Kaupapa who were involved with the school’s establishment during its first three years. In 2013, in its eleventh year, the school was identified as one of the top five successful Kura Kaupapa Maaori. 

The findings of this research will assist whaanau and leaders within schools to develop an understanding and appreciation of five key issues and challenges that a new school may face, and avenues that may take to address these.

text: Kua takoto te maanuka: Te tiimatanga o teetahi Kura Kaupapa Maaori There is a paucity of literature on the establishment of new schools, and more particularly, the establishment of Kura Kaupapa Maaori. In addition, there is even less literature concerning the experiences and perspectives of whaanau and hapuu within Kaupapa Maaori initiatives. 

This thesis, therefore, illustrates the experience of a whaanau in the establishment of their Kura Kaupapa Maaori. The assertion within this thesis is that there are unique issues and challenges that Maaori communities encounter when pursuing the establishment of a Kura Kaupapa Maaori. Furthermore, a key factor in the success of establishing and sustaining the school is in the leadership.

Thus, the cognisance of Kaupapa Maaori and the development of Kura Kaupapa Maaori are explored. In addition, the key characteristics, roles and responsibilities of Maaori leadership both within the wider community and within schools are explored.

This case study included an interview with the Principal, and several focus group interviews with parents, staff and students of the new Kura Kaupapa who were involved with the school’s establishment during its first three years. In 2013, in its eleventh year, the school was identified as one of the top five successful Kura Kaupapa Maaori. 

The findings of this research will assist whaanau and leaders within schools to develop an understanding and appreciation of five key issues and challenges that a new school may face, and avenues that may take to address these.

year: 2014