title: Nitrate dependent anaerobic acetylene-reduction and nitrogen-fixation by soybean bacteroids

authors: Rigaud, J.

subjects: biology

abstract: Bacteroids isolated from nodules produced by one strain of Rhizobium japonicum (CC705) had strong nitrate-reducing activity and reduced C₂H₂ to C₂H₄ and N₂ to NH₃ anaerobically with nitrate. Bacteroids of another strain (CB1809) were much less active nitrate reducers and reduced little C₂H₂ anaerobically. Nitrite, which accumulated in the medium in anaerobic assays, was an inhibitor of C₂H₂reduction in both aerobic and anaerobic conditions. Succinate, at about 25 mM, stimulated both nitrate reduction and C₂H₂ reduction under aerobic conditions. Glucose stimulated C₂H₂ reduction up to 120 mM but nitrate reduction was inhibited in the presence of glucose. In terms of electrons transferred, the aerobic pathway appeared to be about 2.5 times more efficient than the anaerobic pathway in supporting nitrogenase activity of CC705 bacteroids.

text: Nitrate dependent anaerobic acetylene-reduction and nitrogen-fixation by soybean bacteroids Bacteroids isolated from nodules produced by one strain of Rhizobium japonicum (CC705) had strong nitrate-reducing activity and reduced C₂H₂ to C₂H₄ and N₂ to NH₃ anaerobically with nitrate. Bacteroids of another strain (CB1809) were much less active nitrate reducers and reduced little C₂H₂ anaerobically. Nitrite, which accumulated in the medium in anaerobic assays, was an inhibitor of C₂H₂reduction in both aerobic and anaerobic conditions. Succinate, at about 25 mM, stimulated both nitrate reduction and C₂H₂ reduction under aerobic conditions. Glucose stimulated C₂H₂ reduction up to 120 mM but nitrate reduction was inhibited in the presence of glucose. In terms of electrons transferred, the aerobic pathway appeared to be about 2.5 times more efficient than the anaerobic pathway in supporting nitrogenase activity of CC705 bacteroids.

year: 1973

title: Visualizing class probability estimators

authors: Frank, Eibe

subjects: Science & Technology

abstract: Inducing classifiers that make accurate predictions on future data is a driving force for research in inductive learning. However, also of importance to the users is how to gain information from the models produced. Unfortunately, some of the most powerful inductive learning algorithms generate “black boxes”—that is, the representation of the model makes it virtually impossible to gain any insight into what has been learned. This paper presents a technique that can help the user understand why a classifier makes the predictions that it does by providing a two-dimensional visualization of its class probability estimates. It requires the classifier to generate class probabilities but most practical algorithms are able to do so (or can be modified to this end).

text: Visualizing class probability estimators Inducing classifiers that make accurate predictions on future data is a driving force for research in inductive learning. However, also of importance to the users is how to gain information from the models produced. Unfortunately, some of the most powerful inductive learning algorithms generate “black boxes”—that is, the representation of the model makes it virtually impossible to gain any insight into what has been learned. This paper presents a technique that can help the user understand why a classifier makes the predictions that it does by providing a two-dimensional visualization of its class probability estimates. It requires the classifier to generate class probabilities but most practical algorithms are able to do so (or can be modified to this end).

year: 2003-01-01

title: Getting Deep:  Experiences of New Zealand Bodyboarders

authors: Nemani, Mihi Joy

subjects: bodyboarding

abstract: Since the mid 1990s, a growing body of literature on lifestyle sports has produced fresh insights into the nuances, esoteric terminology and social dynamics in an array of lifestyle sport cultures. While surf culture has gained considerable attention from both sociologists and historians, the voices of bodyboarders have been minimal.  Reflecting perceptions held by many in mainstream society, the literature on surf culture tended to marginalize bodyboarding participants, deeming the activity fit for children or teenagers.  Therefore, this project addresses the gap in academic literature on surf culture by adopting a socio-cultural, qualitative approach to give voice to bodyboarders, by revealing some of the complexities within bodyboarding culture, and revealing power relations operating between surfers and bodyboarders in the surf. 

As a three-time world amateur champion female bodyboarder of both Maori and Samoan heritage, I was particularly interested to understand experiences of gender and ethnicity in relation to bodyboarding.  Therefore, I conducted semi-structured interviews with eight bodyboarders living in New Zealand.  To analyse data from the interviews, I employed Bourdieu’s theoretical concepts of habitus, field and capital to explore bodyboarding with the intent of presenting fresh perspectives relating to masculinity and femininity, and experiences of Maori, Pacific Island and New Zealand European bodyboarders.  The participants revealed embodied characteristics of the bodyboarder as well as a variety of strategies used to negotiate space in the surf field.  The experiences of female participants resonated with current literature where opportunities to gain respect were limited based on their marginal position in the male-dominated lifestyle sport culture.  While some female participants successfully negotiated space within the surf field, male bodyboarders revealed other difficulties due to the hyper-masculinity of stand-up surfing culture, and the marginal position of bodyboarders.

In specifically examining the experiences of Maori and Pacific Island participants, I argue that a unique form of cultural capital exists in which respect, courtesy and fairness were given more value than demonstrations of physical capital.  Adopting a socio-cultural approach to analyse the operations of power in the surf field, and particularly how gender and ethnicity affect the experiences of New Zealand bodyboarders, this research project brings “new value to identities and experiences that are marginalized and stigmatized by the larger culture” (Denzin, 2002, p. 486).

text: Getting Deep:  Experiences of New Zealand Bodyboarders Since the mid 1990s, a growing body of literature on lifestyle sports has produced fresh insights into the nuances, esoteric terminology and social dynamics in an array of lifestyle sport cultures. While surf culture has gained considerable attention from both sociologists and historians, the voices of bodyboarders have been minimal.  Reflecting perceptions held by many in mainstream society, the literature on surf culture tended to marginalize bodyboarding participants, deeming the activity fit for children or teenagers.  Therefore, this project addresses the gap in academic literature on surf culture by adopting a socio-cultural, qualitative approach to give voice to bodyboarders, by revealing some of the complexities within bodyboarding culture, and revealing power relations operating between surfers and bodyboarders in the surf. 

As a three-time world amateur champion female bodyboarder of both Maori and Samoan heritage, I was particularly interested to understand experiences of gender and ethnicity in relation to bodyboarding.  Therefore, I conducted semi-structured interviews with eight bodyboarders living in New Zealand.  To analyse data from the interviews, I employed Bourdieu’s theoretical concepts of habitus, field and capital to explore bodyboarding with the intent of presenting fresh perspectives relating to masculinity and femininity, and experiences of Maori, Pacific Island and New Zealand European bodyboarders.  The participants revealed embodied characteristics of the bodyboarder as well as a variety of strategies used to negotiate space in the surf field.  The experiences of female participants resonated with current literature where opportunities to gain respect were limited based on their marginal position in the male-dominated lifestyle sport culture.  While some female participants successfully negotiated space within the surf field, male bodyboarders revealed other difficulties due to the hyper-masculinity of stand-up surfing culture, and the marginal position of bodyboarders.

In specifically examining the experiences of Maori and Pacific Island participants, I argue that a unique form of cultural capital exists in which respect, courtesy and fairness were given more value than demonstrations of physical capital.  Adopting a socio-cultural approach to analyse the operations of power in the surf field, and particularly how gender and ethnicity affect the experiences of New Zealand bodyboarders, this research project brings “new value to identities and experiences that are marginalized and stigmatized by the larger culture” (Denzin, 2002, p. 486).

year: 2013