title: Effect of oxygen on the synthesis, activity and breakdown of the rhizobium denitrification system

authors: O'Hara, G.W.

subjects: biology

abstract: The synthesis, activity and breakdown of the denitrifying enzymes of Rhizobium japonicum, R. lupini and R. meliloti were found to be regulated by O₂. Nitrogen oxide reductases were present in anaerobically grown and symbiotic R. japonicum, but in the case of organisms that had been grown aerobically the enzymes were induced only after a period of incubation under anaerobic conditions. Activity of the denitrification system that had been induced in aerobically grown cells was inhibited by O₂. Denitrification by anaerobically grown cells and bacteroids was stimulated by 5% O₂. Air inhibited denitrification completely. Little loss of denitrifying activity was shown by cells incubated in 5% O₂, but cells incubated at 10% O₂ showed a rapid loss of denitrification activity.

text: Effect of oxygen on the synthesis, activity and breakdown of the rhizobium denitrification system The synthesis, activity and breakdown of the denitrifying enzymes of Rhizobium japonicum, R. lupini and R. meliloti were found to be regulated by O₂. Nitrogen oxide reductases were present in anaerobically grown and symbiotic R. japonicum, but in the case of organisms that had been grown aerobically the enzymes were induced only after a period of incubation under anaerobic conditions. Activity of the denitrification system that had been induced in aerobically grown cells was inhibited by O₂. Denitrification by anaerobically grown cells and bacteroids was stimulated by 5% O₂. Air inhibited denitrification completely. Little loss of denitrifying activity was shown by cells incubated in 5% O₂, but cells incubated at 10% O₂ showed a rapid loss of denitrification activity.

year: 1983

title: A brief review of recent cyanobacteria monitoring results in the Waikato River

authors: Hamilton, David P.

subjects: New Zealand

abstract: Herewith is a report on possible reasons for low concentrations of cyanobacteria (blue-green algae) cells in the Waikato River in summer 2007-08 compared with previous records from 2003 to 2007. Because of time constraints, this report is a cursory consideration and does not provide the level of detail and analysis required to more fully evaluate phytoplankton succession as it relates to the complex interplay amongst physical, chemical and biological variables.
This report was requested by Mighty River Power following a summer when, as a result of drought conditions, the hydro system was operated in a manner similar to 2003, when cyanobacteria blooms(>15,000 cells mL⁻¹) occurred in the upper river and water temperatures were elevated. These operating conditions were characterised by maintenance of high water levels in the hydro dams and low inflows into the system, resulting in relatively long water residence times.

text: A brief review of recent cyanobacteria monitoring results in the Waikato River Herewith is a report on possible reasons for low concentrations of cyanobacteria (blue-green algae) cells in the Waikato River in summer 2007-08 compared with previous records from 2003 to 2007. Because of time constraints, this report is a cursory consideration and does not provide the level of detail and analysis required to more fully evaluate phytoplankton succession as it relates to the complex interplay amongst physical, chemical and biological variables.
This report was requested by Mighty River Power following a summer when, as a result of drought conditions, the hydro system was operated in a manner similar to 2003, when cyanobacteria blooms(>15,000 cells mL⁻¹) occurred in the upper river and water temperatures were elevated. These operating conditions were characterised by maintenance of high water levels in the hydro dams and low inflows into the system, resulting in relatively long water residence times.

year: 2008

title: He Tangata Kei Tua: Guidelines for biobanking with Māori.

authors: Hudson, Maui

abstract: Māori ethical frameworks recognise that all research in New Zealand is of interest to Māori and outline community expectations of appropriate behavior in research to deliver the best outcomes for Māori. Research contributes to the broader development objectives of society and this endeavor is being supported by biobanking infrastructure. Ethics has a specific role in guiding key behaviours, processes and methodologies used in research.
This document outlines a framework for addressing Māori ethical issues within the context of biobanking. It draws on a foundation of mātauranga (Indigenous knowledge) and tikanga Māori (Māori protocols and practices) and will be useful for researchers, ethics committee members and those who engage in consultation or advice about biobanking with Māori in local, regional, national or international settings.

text: He Tangata Kei Tua: Guidelines for biobanking with Māori. Māori ethical frameworks recognise that all research in New Zealand is of interest to Māori and outline community expectations of appropriate behavior in research to deliver the best outcomes for Māori. Research contributes to the broader development objectives of society and this endeavor is being supported by biobanking infrastructure. Ethics has a specific role in guiding key behaviours, processes and methodologies used in research.
This document outlines a framework for addressing Māori ethical issues within the context of biobanking. It draws on a foundation of mātauranga (Indigenous knowledge) and tikanga Māori (Māori protocols and practices) and will be useful for researchers, ethics committee members and those who engage in consultation or advice about biobanking with Māori in local, regional, national or international settings.

year: 2016