title: Cellulolytic properties of an extremely thermophilic anaerobe

authors: Hudson, J. Andrew

subjects: biology

abstract: An extremely thermophilic anaerobe was isolated from a New Zealand hot spring by incubating bacterial mat strands in a medium containing xylan. The Gramreaction-negative organism that was subsequently purified had a temperature optimum of 70° C and a pH optimum of 7.0. The isolate, designated strain H173, grew on a restricted range of carbon sources. In batch culture H173 could degrade Avicel completely when supplied at 5 or 10 g l⁻¹. There was an initial growth phase, during which a cellulase complex was produced and carbohydrates fermented to form acetic and lactic acids, followed by a phase where cells were not metabolising but the cellulase complex actively converted cellulose to glucose. When co-cultured with strain Rt8.B1, an ethanologenic extreme thermophile, glucose was fermented to ethanol and acetate, and no reducing sugars accumulated in the medium. In pH controlled batch culture H173 produced an increased amount of lactate and acetate but there was again a phase when reducing sugars accumulated in the medium, and these were converted to ethanol by co-culture with Rt8.B1.

text: Cellulolytic properties of an extremely thermophilic anaerobe An extremely thermophilic anaerobe was isolated from a New Zealand hot spring by incubating bacterial mat strands in a medium containing xylan. The Gramreaction-negative organism that was subsequently purified had a temperature optimum of 70° C and a pH optimum of 7.0. The isolate, designated strain H173, grew on a restricted range of carbon sources. In batch culture H173 could degrade Avicel completely when supplied at 5 or 10 g l⁻¹. There was an initial growth phase, during which a cellulase complex was produced and carbohydrates fermented to form acetic and lactic acids, followed by a phase where cells were not metabolising but the cellulase complex actively converted cellulose to glucose. When co-cultured with strain Rt8.B1, an ethanologenic extreme thermophile, glucose was fermented to ethanol and acetate, and no reducing sugars accumulated in the medium. In pH controlled batch culture H173 produced an increased amount of lactate and acetate but there was again a phase when reducing sugars accumulated in the medium, and these were converted to ethanol by co-culture with Rt8.B1.

year: 1990

title: ‘Economics with training wheels’: Using blogs in teaching and assessing introductory economics

authors: Cameron, Michael Patrick

subjects: assessment

abstract: Blogs provide a dynamic interactive medium for online discussion, consistent with communal constructivist pedagogy. The author of this article describes and evaluates a blog assignment used in the teaching and assessment of a small (40-60 students) introductory economics course. Using qualitative and quantitative data collected across four semesters, students participation in the blog assignment is found to be associated with student ability, gender, and student perceptions of the blog. Importantly, students with past economics experience do not appear to crowd out novice economics students. Student performance is positively associated with the quality of their blog participation after controlling for student ability, suggesting that a focus on quality of student engagement could further improve learning outcomes. Students generally report overall positive experiences with the blog assignment.

text: ‘Economics with training wheels’: Using blogs in teaching and assessing introductory economics Blogs provide a dynamic interactive medium for online discussion, consistent with communal constructivist pedagogy. The author of this article describes and evaluates a blog assignment used in the teaching and assessment of a small (40-60 students) introductory economics course. Using qualitative and quantitative data collected across four semesters, students participation in the blog assignment is found to be associated with student ability, gender, and student perceptions of the blog. Importantly, students with past economics experience do not appear to crowd out novice economics students. Student performance is positively associated with the quality of their blog participation after controlling for student ability, suggesting that a focus on quality of student engagement could further improve learning outcomes. Students generally report overall positive experiences with the blog assignment.

year: 2012

title: "He Matapihi ki te Mana Raraunga” - Conceptualising Big Data through a Māori lens

authors: Hudson, Maui

abstract: Advances in computer technology and analytical processes create an environment where data becomes the raw material mined to create valuable information and insights. The idea of Big Data emerges from the collation of increasing vast amounts of data enabled by the shift towards an increasingly open data environment. How this changing context alters the relationship between Iwi/Māori collectives and their mātauranga, cultural information and data has yet to be fully explored. However, the concept of Māori Data Sovereignty, which anticipates Māori governance over Māori data, has a natural appeal. This chapter outlines some of the Māori concepts and presents a framework which may be used to inform how data and data use may be conceptualised through a Māori cultural lens.

text: "He Matapihi ki te Mana Raraunga” - Conceptualising Big Data through a Māori lens Advances in computer technology and analytical processes create an environment where data becomes the raw material mined to create valuable information and insights. The idea of Big Data emerges from the collation of increasing vast amounts of data enabled by the shift towards an increasingly open data environment. How this changing context alters the relationship between Iwi/Māori collectives and their mātauranga, cultural information and data has yet to be fully explored. However, the concept of Māori Data Sovereignty, which anticipates Māori governance over Māori data, has a natural appeal. This chapter outlines some of the Māori concepts and presents a framework which may be used to inform how data and data use may be conceptualised through a Māori cultural lens.

year: 2017