title: Nitrogen losses from soils caused by Rhizobium-dependent denitrification

authors: O'Hara, G.W.

subjects: biology

abstract: Biological nitrogen fixation by the Rhizobium-legume symbiosis is of considerable agronomic importance, and most research on rhizobia is aimed at a better understanding of symbiotic nitrogen fixation (e.g. Hardy er nl.. 1979; Hardy and Silver. 1977: Hardv and Gibson. 1977). However the d I significance of early observations on denitrification by rhizobia (Rajagopalan, 1938; Ishizawa, 1939; Wilson, 1947) appears to have been overlooked; it has recently been shown to be widespread among Rhizobium species (Zablotowicz et al., 1978; Daniel ef al., 1980a. 1982) and to occur in soils under laboratory conditions (Daniel el al., 1980b). We report here field experiments showing the loss of fixed nitrogen from soils by denitrification carried out by rhizobia at rates comparable to those at which rhizobia fix nitrogen. This occurs in aerated soils, unlike previously described soil denitrification systems which are considered to be anaerobic (Knowles, 1982). Rhizobia are widespread in agricultural ecosystems (Parker et al., 1977) and an understanding of the conditions under which they denitrify may convey substantial benefits.

text: Nitrogen losses from soils caused by Rhizobium-dependent denitrification Biological nitrogen fixation by the Rhizobium-legume symbiosis is of considerable agronomic importance, and most research on rhizobia is aimed at a better understanding of symbiotic nitrogen fixation (e.g. Hardy er nl.. 1979; Hardy and Silver. 1977: Hardv and Gibson. 1977). However the d I significance of early observations on denitrification by rhizobia (Rajagopalan, 1938; Ishizawa, 1939; Wilson, 1947) appears to have been overlooked; it has recently been shown to be widespread among Rhizobium species (Zablotowicz et al., 1978; Daniel ef al., 1980a. 1982) and to occur in soils under laboratory conditions (Daniel el al., 1980b). We report here field experiments showing the loss of fixed nitrogen from soils by denitrification carried out by rhizobia at rates comparable to those at which rhizobia fix nitrogen. This occurs in aerated soils, unlike previously described soil denitrification systems which are considered to be anaerobic (Knowles, 1982). Rhizobia are widespread in agricultural ecosystems (Parker et al., 1977) and an understanding of the conditions under which they denitrify may convey substantial benefits.

year: 1984

title: Weka: A machine learning workbench for data mining

authors: Frank, Eibe

subjects: computer science

abstract: The Weka workbench is an organized collection of state-of-the-art machine learning algorithms and data preprocessing tools. The basic way of interacting with these methods is by invoking them from the command line. However, convenient interactive graphical user interfaces are provided for data exploration, for setting up large-scale experiments on distributed computing platforms, and for designing configurations for streamed data processing. These interfaces constitute an advanced environment for experimental data mining. The system is written in Java and distributed under the terms of the GNU General Public License.

text: Weka: A machine learning workbench for data mining The Weka workbench is an organized collection of state-of-the-art machine learning algorithms and data preprocessing tools. The basic way of interacting with these methods is by invoking them from the command line. However, convenient interactive graphical user interfaces are provided for data exploration, for setting up large-scale experiments on distributed computing platforms, and for designing configurations for streamed data processing. These interfaces constitute an advanced environment for experimental data mining. The system is written in Java and distributed under the terms of the GNU General Public License.

year: 2005

title: Supervising research in Māori cultural contexts: a decolonizing, relational response

authors: Berryman, Mere

abstract: We have collaborated for 25 years as indigenous Māori and non- Māori researchers undertaking research with Māori families, their schools and communities. We have endeavored to meet our responsibilities to the Māori people (indigenous inhabitants of New Zealand) and communities with whom we have researched, as well as meet the requirements and responsibilities of our academic institutions. In this paper, we reflect on the implications of these responsibilities for our work as supervisors of master’s and doctoral students (Māori and non-Māori) who seek to draw on decolonizing methodologies as they undertake research in Māori cultural contexts. We draw on the experiences and interactions we have had with four different postgraduate students whose research on improving educational outcomes for Māori students has required them to engage and participate in Māori cultural contexts.

text: Supervising research in Māori cultural contexts: a decolonizing, relational response We have collaborated for 25 years as indigenous Māori and non- Māori researchers undertaking research with Māori families, their schools and communities. We have endeavored to meet our responsibilities to the Māori people (indigenous inhabitants of New Zealand) and communities with whom we have researched, as well as meet the requirements and responsibilities of our academic institutions. In this paper, we reflect on the implications of these responsibilities for our work as supervisors of master’s and doctoral students (Māori and non-Māori) who seek to draw on decolonizing methodologies as they undertake research in Māori cultural contexts. We draw on the experiences and interactions we have had with four different postgraduate students whose research on improving educational outcomes for Māori students has required them to engage and participate in Māori cultural contexts.

year: 2017