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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

Aspects of electron transport in Thiosphaera pantotropha and Paracoccus denitrificans

Moir, James W. B. January 1993 (has links)
No description available.

Physiological and genetic studies on heterotrophic nitrification

Crossman, Lisa Caroline January 1997 (has links)
No description available.

Where does denitrification occur in the rhizosphere?

Giles, Madeline E. January 2012 (has links)
Denitrification is the sequential reduction of NO3- to N2, through a number of intermediary steps, one of which is N2O, a potent green house gas. N2O has a global warming potential over 300 times greater than that of CO2 over a 100 a year period (IPCC, 2007). Soils are a significant source of N2O through the microbially mediated process of denitrification. The rhizosphere is a potentially important source of N2O as rhizodeposited carbon from plant roots can support a larger and more active microbial biomass. Despite this little is known about the effects of low molecular weight carbon (LMWC) on the production of N2O or N2 or how the production of these gases can vary with the small scale variation in carbon quantity found in the rhizosphere. Studies using a soil microcosm revealed that not all LMWC compounds were able to stimulate the production of N2O. Of the three compounds studied the addition of glucose or glutamine to soil resulted in a greater production of N2O than occurred in the control, while the addition of citric acid did not. An experimental system was developed that would allow the creation of a carbon gradient over 6 cm and along which N2O and N2 could be quantified. This allowed an insight into the potential for small scale variation in denitrification. Similar spatial variation in N2O and N2 concentrations were found in both glucose and glutamine treated soil, while no spatial variation in these gasses was found in citric acid treated soil. Peak N2 concentrations occurred closer to the carbon source than peak N2O concentrations, potentially as a result of the higher C : N ratio. This was associated with a shift in the bacterial community, and in glucose treated soil with an increase in the proportion of bacteria containing nosZ or nirK. Despite this spatial patterns in N2O production remained similar even in experiments where the community did not change. The bacterial community did however exert an influence by affecting the magnitude of N2O and N2 produced. The results from this thesis suggest that denitrification has the potential to vary in the rhizosphere as a result of changes in carbon concentrations, carbon compounds and the associated changes in the microbial community.

Modelling metalloenzymes : studies on the mechanism of nitrite reductase

Maurer, Richard I. January 2002 (has links)
No description available.

Gaseous loss of nitrogen from soil

Loewenstein, Howard. January 1955 (has links)
Thesis (Ph. D.)--University of Wisconsin, 1955. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 110-115).

Denitrification potentials in soils underlying a riparian forest and an agricultural field in the coastal plain of Virginia /

Smedley, Scott Brian. January 1993 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1993. / Vita. Abstract. Includes bibliographical references (leaves 76-79). Also available via the Internet.

The role of ectomycorrhizal fungi in denitrification

Prendergast-Miller, Miranda T. January 2009 (has links)
Thesis (Ph.D.)--Aberdeen University, 2009. / Title from web page (viewed on Dec. 9, 2009). Includes bibliographical references.

Alternative regimes for anion exchange denitrification

Nowosielski, Andrzej January 1989 (has links)
No description available.

Anaerobic and aerobic denitrification : Some biochemical and ecological aspects

Davies, K. J. P. January 1987 (has links)
No description available.

Aspects of the nitrogen cycle in a small estuary

Owens, Nicholas John Paul January 1981 (has links)
No description available.

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