Thesis submitted for the degree of Doctor of Philosophy in the New University of Ulster.
|Statement||by Anthea Riddolls.|
Aspects of Nitrogen Fixation by Blue-Green Algae in Lough Neagh. Author: Riddolls, A. ISNI: Awarding Body: The New University of Ulster Current Institution: Ulster University Date of Award: Availability of Full Text. 1. The unicellular blue-green alga Chlorogloea fritschii Mitra has been isolated in pure bacteria-free culture. 2. Evidence showing that this alga is able to fix elementary nitrogen has been. ) or by manometer (Cox, ) was employed to assess N2 fixation by blue-green algae. It is not a common method. The use of 15N2 as tracer (Burris et al., ) is a more sensitive method to demonstrate N2-fixation. In this method, the blue-green algae are incubated in the presence of 15N2 enriched atmosphere, and the 15N incorporated in. Ley SH, Yeh TC, Liu FJ, Wang LM, Tsui SK () The nitrogen fixation of some blue-green algae from Chinese ricelield. Acta Hydrobiol Sinica Google Scholar Ley SH, Yeh TC, Liu FJ, Tsui SK (a) The effects of nitrogen-fixing blue-green algae on the yields of rice plant.
Certain non-heterocystous, filamentous algae also fix nitrogen, but only under microaerobic or anaerobic conditions. Because blue-green algae are photoautotrophic and develop in the upper soil layer, where conditions are usually aerobic, nitrogen fixation by non-heterocystous algae is much slower than by heterocystous blue-green algae. a)Nitrogen fixation in rice fields. Nitrogen-fixing blue-green algae grow abundantly in tropical regions and are particularly common in paddy fields. Their possible role in the nitrogen accumulation of soil has been studied. The most vigorous nitrogen-fixing blue-green algae have been assessed for use as green manure in rice fields and favorable effects have been reported in India and . Following a large bloom of the blue-green bacterium Anabaena flosaquae in , human use of the Lough was affected by disruption to water treatment plants, commercial fishing and recreational use. Riddolls, A. () Aspects of nitrogen fixation by blue-green algae in Lough Neagh. Thesis. New University of Ulster. Google Scholar. Riddolls, A. () Aspects of nitrogen fixation in Lough Neagh 1. Acetylene reduction and the frequency of Aphanizomenon flos-aquae heterocysts. eBook Packages Springer Book Archive; Buy this book.
Filamentous cyanobacteria (blue-green algae, cyano-prokaryotes) include some of the most widely recognized and important freshwater algae in the world, many of which produce surface blooms, fix atmospheric nitrogen, and are important components of global carbon fixation (Fogg et al., ; Fay and Van Baalen, ; Whitton and Potts, ). 4. BLUE-GREEN ALGAE 45 Introduction 45 Nitrogen-Fixing Blue-Green Algae 45 Classification 45 Genetics of Blue-Green Algae 48 The Site of the Nitrogenase Enzyme in Blue-Green Algae 48 Isolation and Purification of Blue-Green Algae 48 Unialgal cultures 48 Bacteria-free cultures of algae Science 21 Feb Vol. 71, Issue , pp. DOI: /sciencea. Abstract. Mastigocladus laminosus Cohn, a blue-green alga of hot springs, has been obtained in pure bacteria-free culture and has been shown to be capable of fixing elementary nitrogen. This appears to be the first instance in which this capacity has been demonstrated in a blue-green alga belonging to a family other than the Nostocaceae.