title: Review: The effect of temperature on enzyme activity: new insights and their implications

authors: Daniel, Roy M.

subjects: Equilibrium Model

abstract: The two established thermal properties of enzymes are their activation energy and their thermal stability. Arising from careful measurements of the thermal behaviour of enzymes, a new model, the Equilibrium Model, has been developed to explain more fully the effects of temperature on enzymes. The model describes the effect of temperature on enzyme activity in terms of a rapidly reversible active-inactive transition, in addition to an irreversible thermal inactivation. Two new thermal parameters, T eq and ΔH eq, describe the active–inactive transition, and enable a complete description of the effect of temperature on enzyme activity. We review here the Model itself, methods for the determination of T eq and ΔH eq, and the implications of the Model for the environmental adaptation and evolution of enzymes, and for biotechnology.

text: Review: The effect of temperature on enzyme activity: new insights and their implications The two established thermal properties of enzymes are their activation energy and their thermal stability. Arising from careful measurements of the thermal behaviour of enzymes, a new model, the Equilibrium Model, has been developed to explain more fully the effects of temperature on enzymes. The model describes the effect of temperature on enzyme activity in terms of a rapidly reversible active-inactive transition, in addition to an irreversible thermal inactivation. Two new thermal parameters, T eq and ΔH eq, describe the active–inactive transition, and enable a complete description of the effect of temperature on enzyme activity. We review here the Model itself, methods for the determination of T eq and ΔH eq, and the implications of the Model for the environmental adaptation and evolution of enzymes, and for biotechnology.

year: 2007

title: Quaternary research in New Zealand since 2000: an overview

authors: Bostock, Helen C.

abstract: With the AQUA milestone of 30 years it seems an appropriate time to review the progress and achievements of Quaternary research in New Zealand. This article highlights some of the major achievements since the formal review of New Zealand’s Quaternary record by Newnham et al. (1999). The focus here is on paleoclimate and geochronology and is by no means a comprehensive review. We encourage members to write future articles for Quaternary Australasia (QA) about their exciting projects to keep the wider Australasian community informed. 
One of the main differences between Australian and New Zealand Quaternary science is the wide use of tephrochronology to correlate and date deposits and events across the landscape, helping to link terrestrial and marine records, especially in the North Island. There have been significant advances using glass-based fission-track dating, corrected for annealing, and the use of the electron microprobe and laser ablation inductively-coupled plasma mass spectrometry for obtaining major- and trace-element analyses, respectively, to chemically fingerprint individual glass shards in tephras to aid their correlation (Shane, 2000; Lowe, 2011). Also the identification and analysis of cryptotephras (concentrations of glass shards not visible as a layer) have greatly expanded the geographic range of many tephras, allowing the application of tephrochronology as a stratigraphic and dating tool across much wider areas than previously possible (Gehrels et al., 2008).

text: Quaternary research in New Zealand since 2000: an overview With the AQUA milestone of 30 years it seems an appropriate time to review the progress and achievements of Quaternary research in New Zealand. This article highlights some of the major achievements since the formal review of New Zealand’s Quaternary record by Newnham et al. (1999). The focus here is on paleoclimate and geochronology and is by no means a comprehensive review. We encourage members to write future articles for Quaternary Australasia (QA) about their exciting projects to keep the wider Australasian community informed. 
One of the main differences between Australian and New Zealand Quaternary science is the wide use of tephrochronology to correlate and date deposits and events across the landscape, helping to link terrestrial and marine records, especially in the North Island. There have been significant advances using glass-based fission-track dating, corrected for annealing, and the use of the electron microprobe and laser ablation inductively-coupled plasma mass spectrometry for obtaining major- and trace-element analyses, respectively, to chemically fingerprint individual glass shards in tephras to aid their correlation (Shane, 2000; Lowe, 2011). Also the identification and analysis of cryptotephras (concentrations of glass shards not visible as a layer) have greatly expanded the geographic range of many tephras, allowing the application of tephrochronology as a stratigraphic and dating tool across much wider areas than previously possible (Gehrels et al., 2008).

year: 2012

title: Pākehā counsellors consider their positioning: Towards postcolonial praxis

authors: Crocket, Alastair Robert

subjects: Counselling

abstract: The challenges of achieving the potential, which the Treaty of Waitangi offers for a postcolonial present and future, have shaped life in Aotearoa New Zealand over the last four decades. This thesis draws on this history and challenge to consider the practice possibilities for Pākehā counsellors when they work with clients and colleagues of other cultures. It is strongly influenced by the Treaty of Waitangi but seeks not to be limited to a Māori/Pākehā binary. It has been undertaken in the hopes of informing developments in the practice of students seeking to qualify to work as counsellors and more experienced practitioners. The first theoretical foundation for this study is poststructuralism which is considered as a braided stream of theorizing where braids divide and unite. A Foucauldian social constructionism underlies this project, which extends to a consideration of subjectification, agency and positioning theory. This study is also intentionally postcolonial drawing on Said’s seminal works, Orientalism (1979) and Culture and Imperialism (1993) and North American and European writing about identity politics and intersectionality. It views the centring of the Treaty of Waitangi in this land as postcolonial work. These two emphases, poststructuralism and postcolonialism, provide the theoretical base for an exploration of the context of professional counselling practice in Aotearoa New Zealand. Five experienced counsellors constituted a research group who firstly discussed practising as a Pākehā counsellor and then acknowledged their hopes and fears for their practice with clients of other cultures. In later stages of the data generation the participants were invited to join in processes of discourse analysis and deconstruction which produced shifts in practice and practice identity. This study identifies two forms of praxis that might inform a counselling practice which seeks to achieve a postcolonial purpose: these are named as critical discursive praxis and critical Pākehā praxis.

text: Pākehā counsellors consider their positioning: Towards postcolonial praxis The challenges of achieving the potential, which the Treaty of Waitangi offers for a postcolonial present and future, have shaped life in Aotearoa New Zealand over the last four decades. This thesis draws on this history and challenge to consider the practice possibilities for Pākehā counsellors when they work with clients and colleagues of other cultures. It is strongly influenced by the Treaty of Waitangi but seeks not to be limited to a Māori/Pākehā binary. It has been undertaken in the hopes of informing developments in the practice of students seeking to qualify to work as counsellors and more experienced practitioners. The first theoretical foundation for this study is poststructuralism which is considered as a braided stream of theorizing where braids divide and unite. A Foucauldian social constructionism underlies this project, which extends to a consideration of subjectification, agency and positioning theory. This study is also intentionally postcolonial drawing on Said’s seminal works, Orientalism (1979) and Culture and Imperialism (1993) and North American and European writing about identity politics and intersectionality. It views the centring of the Treaty of Waitangi in this land as postcolonial work. These two emphases, poststructuralism and postcolonialism, provide the theoretical base for an exploration of the context of professional counselling practice in Aotearoa New Zealand. Five experienced counsellors constituted a research group who firstly discussed practising as a Pākehā counsellor and then acknowledged their hopes and fears for their practice with clients of other cultures. In later stages of the data generation the participants were invited to join in processes of discourse analysis and deconstruction which produced shifts in practice and practice identity. This study identifies two forms of praxis that might inform a counselling practice which seeks to achieve a postcolonial purpose: these are named as critical discursive praxis and critical Pākehā praxis.

year: 2010