Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"Phosphorus limitation"”.
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Mycorrhizal roles in broomsedge plants under phosphorus limitation and aluminum toxicity
… to increasing exploited Pi pool, and increased phosphorus use efficiency. Moreover, mycorrhizal plants balanced accumulation of nutrients under varying Pi availability. All these brought about by mycorrhizal symbioses benefit broomsedge plants overcoming Pi deficiency and supporting optimal …
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Understanding key factors influencing habitat quality for the endangered fountain darter (Etheostoma fonticola) in the Comal River.
… water samples and NDS results indicated a severe phosphorus limitation in the water column and some macrophyte species may be limited by phosphorus as well. Herbivory in Landa Lake, particularly by crayfish, appears to be much more severe than previously thought and increased soil fertility …
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Effect of phosphorus limiting conditions on process performance in activated sludge
The effect of phosphorus limiting conditions on process performance was investigated using laboratory scale activated sludge units. Data were collected for COD:P ratios of 287:1, 212:1, 87:1 and 56:1 at several mean cell residence times. Data collected at COD:P ratios of 287:1 and 212:1 produced …
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Decomposition and Production of Dissolved Organic Matter by Aquatic Bacteria
… in or-ganic molecules (namely nitrogen (N) and phosphorus (P)). A more integrated approach that incorporates microbial processing of both C and major macronutrients such as N and P is needed to describe the biogeochemical transformations of organic matter in freshwaters. In this dissertation I …
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Metabolic differentiation in the lichen Cladonia portentosa from different wet nitrogen deposition regimes’
… deposition regimes and consequent phosphorus deficiency. In contrast, the structurally related phosphatidylcholine containing a C18:2 ester showed the opposite trend in natural populations of C. portentosa. Results obtained for C. portentosa collected from the N manipulation site …
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The effect of phosphorus and nitrogen limitation on viral infection in microcystis aeruginosa NIES298 using the cyanophage Ma-LMM01
… in Japan. The effect of phosphate and nitrogen limitation on phage and host replication was evaluated through modification of <em>M. aeruginosa</em> culture media. Growth of the host cells was monitored by culture light absorbance at 600 nm, while phage (genome) replication was quantified using …
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The effects of light, temperature and nutrients on coccolithophores and implications for biogeochemical models
… two strains of E. huxleyi and one G. oceanica. Phosphorus limitation led to an increase in cell volume (112- 157%) and particulate organic carbon (21-54%) in E. huxleyi and G. oceanica, relative to cultures grown under nitrogen limitation. Comparison of uptake rates for phosphate and nitrate …
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A metabolomics-based approach to study abiotic stress in <em>Lolium perenne</em>
… Furthermore, for the water- and phosphorous-limitation studies this approach was complemented with transcript analysis.<br/><br/>In order to study water-limitation a hydroponics system supplemented with polyethyleneglycol (PEG) was used to induce water-limitation for a period of one-week. A …
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Phosphorus biogeochemistry and models in estuaries: case study of the Southampton Water system
… and the major features of nutrients (nitrogen, phosphorus and silicon) and suspended particulate matter (SPM) thus obtained. Additionally phosphorus in pore waters, and the solid phase in sediments were measured. The forms of phosphorus in the solid phase of sediment (deposited and suspended) …
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Exploring the Spatial Distribution of Marine Nitrogen Fixation Through Statistical Modeling, High-Resolution Observations and Molecular Level Characterization
… fixation rates were significantly enhanced when phosphorus and Fe availabilities, and chlorophyll-a concentration increased across the Gulf Stream into the subpolar and coastal waters. Phosphorus limitation was confirmed with changes in the expression of phosphorus uptake genes in Trichodesmium …