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 13 of 13 for “"Diazotroph"”.
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Diazotroph Assemblages of Salt Marsh Plants Growing Along An Environmental Gradient: Assemblage Composition and Responses to Environmental Conditions
… productive ecosystems known. Nitrogen fixation (diazotrophy) by the nitrogen-fixing microorganisms in these ecosystems is one of the primary sources of `new' nitrogen and is therefore ecologically significant. The diazotroph assemblages associated with the rhizosphere of <em>S. alterniflora</em> …
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Ecology of nitrogen-fixing bacteria associated with Miscanthus
… anthropogenic inputs of nitrogen fertilizer. Diazotrophs associated with non-leguminous grasses have great potential to contribute biologically fixed nitrogen as a sustainable N source for bioenergy grasses. There are previous few studies investigating diazotroph community composition …
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Impact of free-living diazotrophs, Azospirillum lipoferum and Gluconacetobacter azotocaptans, on growth and nitrogen utilization by wheat (Triticum aestivum cv. Lillian)
… colonizing, free-living, N2-fixing bacteria (diazotrophs) with the potential to transfer fixed N to associated plants. The purpose of this study was to evaluate the agronomic efficiency of two diazotrophs, Azospirillum lipoferum and Gluconacetobacter azotocaptans, inoculated onto wheat. …
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Ecology of Root Nodule Bacterial Diversity: Implications for Soybean Growth
Diazotrophs supply legumes such as soybean (Glycine max L. Merr) with nitrogen (N) needed for protein synthesis through biological nitrogen fixation (BNF). Through BNF, these bacteria such as Bradyrhizobium that reside in soybean root nodules, convert atmospheric nitrogen (N2) into ammonia (NH3/ …
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Impacts of Microenvironment On Distributions and Activities of Bacteria In A Salt Marsh Environment
… and seasonally non-responsive nitrogen fixing (diazotrophic) bacterial assemblages. Vibrionaceae are represented as members of the diazotrophically-active, seasonally non-responsive assemblage, indicating that this bacterial family is also a ubiquitous and potentially important component of the …
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Phosphorus physiology of the marine cyanobacterium Trichodesmium
… and the global cycling of carbon. The marine diazotroph Trichodesmium is a major contributor to both primary production and nitrogen fixation in the tropical and subtropical oceans. These regions are often characterized by low phosphorus (P) concentrations, and P deficiency of Trichodesmium …
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Phosphorus physiology of the marine cyanobacterium Trichodesmium
… and the global cycling of carbon. The marine diazotroph Trichodesmium is a major contributor to both primary production and nitrogen fixation in the tropical and subtropical oceans. These regions are often characterized by low phosphorus (P) concentrations, and P deficiency of Trichodesmium …
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In the Margins: Reconsidering the Range and Contribution of Diazotrophs in Nearshore Environments
… suggests that the niche preferences of distinct diazotrophic (N<sub>2</sub> fixing) clades differ due to their metabolic and ecological diversity, hampering efforts to close the N budget and model N<sub>2</sub> fixation accurately. Here, I explore the range of N<sub>2</sub> fixation across …
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Untersuchung der Expression und Aktivität des Molybdän-Eisen Protein in Wolinella succinogenes
… Medium Nitrogenase zwar exprimiert, aber nicht diazotroph wächst. Der Nachweis einer Nitrogenaseaktivität war hier noch nicht voll aussagekräftig, da die Expressionsbedingungen sowie die effektive Stickstoffkonzentration im Medium noch nicht voll erfasst wurden. Daher wurden in Anschluss weitere …
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<i>Trichodesmium</i> spp.: Numerical Studies of Resource Competition, Carbohydrate Ballasting, and Remote-Sensing Reflectance
… recent years, a new appreciation for the role of diazotrophy in the oceans has emerged. This dissertation reports on three modeling studies designed to investigate ecological processes associated with <em>Trichodesmium </em>spp., the most conspicuous marine diazotroph: (1) characterization of a …
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Legume integration and nutrient management impacts on soil health and cropping system productivity
… using a 15N isotope dilution technique, while diazotroph abundance in the rhizosphere soil and cowpea nodules were assessed using nifH gene abundance. Full-length 16S rRNA sequencing was also used to profile rhizosphere bacterial communities. Cowpea growth was greatest in the urea and medium …
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Controls on nitrogen fixation and nitrogen release in a diazotrophic endosymbiont of shipworms
… is tightly regulated by oxygen in most other diazotrophic microbes. Also, the direct evidence of new N being incorporated into the host tissue indicates that there are potentially complex nutrient cycles in this symbiosis, which have not been investigated. We used the cultivated symbiont …
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Exploring the Spatial Distribution of Marine Nitrogen Fixation Through Statistical Modeling, High-Resolution Observations and Molecular Level Characterization
… by a select group of microorganisms called diazotrophs, converts nitrogen gas (N2) into bioavailable nitrogen that can support the growth of marine phytoplankton. By supplying new nitrogen to marine ecosystems, marine N2 fixation affects marine primary production, the uptake of carbon …