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Showing 1 to 20 of 56 for “"nutrient acquisition"”.
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Patterns of Nutrient Acquisition in Canvasbacks During Spring Migration
<p>Wetlands used by nesting birds have traditionally been considered the only habitats able to influence natality rates. I examined the potential for body reserves (fat, protein, and calcium) acquired on spring staging areas to be used for reproduction. My objectives were to: 1) describe changes in …
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Functional role of plant water fluxes in nutrient acquisition
… it may also function to cool leaves, transport nutrients and drive nutrient acquisition via mass-flow. In addition to transpiration, plants water fluxes occur through hydraulic redistribution (HR). I hypothesized that an important function of plant water fluxes is to drive mass-flow nutrient …
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Uncovering Mechanisms of Cell Envelope Integrity and Nutrient Acquisition in Acinetobacter baumannii
… but must also allow the entry of essential nutrients. The maintenance of lipid asymmetry (Mla) system is the primary homeostatic mechanism in Gram-negative bacteria to maintain lipid asymmetry by removing mislocalized phospholipids from the OM. In A. baumannii and other bacteria, loss of the …
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Mechanisms of nutrient limitation and nutrient acquisition in managed and unmanaged forest ecosystems
… the results of several investigations into nutrient acquisition processes in the forests of New Hampshire. I begin with a meta-analysis of fertilization studies showing that phosphorus (P) and calcium (Ca) as well as nitrogen (N) may limit primary production in deciduous forests of the …
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Understanding the role of host amino acid transporters in nutrient acquisition by oomycete pathogens
… pathogens are obligate biotrophs that extract nutrients exclusively from living plant cells. As a part of its obligate biotrophy lifestyle, Hpa has lost the ability to assimilate inorganic nitrogen and sulfur. It thus has to acquire these nutrients from the host in an organic form; possibly …
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Oxalic acid production by the ectomycorrhizal fungus Hebeloma westraliensis and its role in the nutrient acquisition and growth of Eucalyptus diversicolor in calcareous soil
… the solution concentrations of both of these nutrient elements, due partly to sequestration of these elements in fungal and plant tissues. Plant tissue P concentration was decreased and tissue Ca concentration increased in the calcareous systems. Mycorrhization increased the concentrations of …
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Impacts of Invasive Asian Jumping Worms on Soil Properties in Turfgrass Systems and their effects on Plant Nutrient Acquisition and Physiological Responses in Greenhouse Experiments
… mid-sized aggregates (0.25–2 mm) decreased. Soil nutrients remained largely stable, though phosphorus and organic matter showed seasonally dependent shifts linked to jumping worm presence. Firth logistic regression identified organic matter as a significant predictor of jumping worm detection, …
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Transcriptional and Post-Transcriptional Regulation of Nodule-Specific Gene Expression in Soybean
<p>Lateral roots and nodules are two important nutrient acquisition organs in soybean. The evolutionary origin of nodules from lateral roots has been highly hypothesized based on morphological similarities and genetic studies, but gene expression profiles during the formation of these organs have …
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Root-zone temperature effects on the nutrient uptake of horticultural crops
… known about the effects of supraoptimal RZT on nutrient absorption. In my first study, I determined the amount of phosphorus (P), zinc (Zn), and manganese (Mn) in tomato (Lycopersicon esculentum Mill. 'Jet Star'), muskmelon (Cucumis melo L. 'Gold Star'), and thornless honey locust (Gleditsia …
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Investigations of physiological and competitive relationships of Elymus species related to establishment in the Great Basin, USA.
… of native plants in competition for limiting nutrients: Bromus tectorum employs ruderal strategies of resource acquisition, is an effective competitor for water and nitrogen, and can cause mortality of natives in invaded fields as well as prevent establishment of native seedlings. In response …
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Response of a sand-plain lowland fynbos ecosystem to nutrient additions
… phosphorus (P) and a mixture of all essential nutrients excluding N and P (M) on various components of the soils and vegetation of a sand-plain lowland fynbos ecosystem at Pella, south-western Cape Province, South Africawere studied, namely: 1) Soil nutrient dynamics. 2) Phenology, shoot …
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Characterization of a carbon source-dependent, phytohormone-responsive, free methionine-(R)-sulfoxide reductase from Komagataeibacter hansenii
… as it promotes anchoring to surfaces for nutrient acquisition and protection from environmental stress. BC has been long studied however, there is a lack of research pertaining to the regulation of BC production. In this thesis, the functional role of a putative free methionine sulfoxide …
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Transcriptomic Insights into the Morphological Variation Present in Bromeliaceae
… leaf morphology and arrangement, root type, and nutrient acquisition, Pittendrigh (1948) conservatively separated bromeliads into four main classes. These four main classes are designated Type I bromeliads, Type II bromeliads, Type III bromeliads and Type IV bromeliads. We used RNA-sequencing of …
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Investigating the role of Leucine-Responsive Regulatory Protein (Lrp) in the production and regulation of specific virulence factors in Pseudomonas aeruginosa
… this resistance as they help with virulence and nutrient acquisition. Previously, Lrp has been shown to bind to PQS in <em>P. aeruginosa</em>, a key player in quorum sensing, and when <em>lrp</em> is knocked out, there is a reduction in these quorum sensing virulence factors. Leucine-responsive …
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Phenotypic Analysis of the Regulatory Role of the Leucine-Responsive Regulatory Protein (LrpPA) in Pseudomonas aeruginosa
<p>Nutrient acquisition is critical to survival and infection by the opportunistic bacterium <em>Pseudomonas aeruginosa</em>. This pathogen expresses a number of virulence factors that are a part of the starvation response and are important in host-pathogen interactions. Additionally, <em>P. …
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Distribution of leaf dissection and sclerophylly along microhabitat gradients in pteridophytes of the Cape peninsula
… have been reported to occur mainly on dry, low-nutrient soils in situations of high insolation. However; a number of physiological functions have been proposed for the two sets of traits. Ferns are well-suited to the study of leaf structure and its impact in different environments, as they show …
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Fruit chemical traits shape bat nutritional ecology: from basic science to applications
… the variability and associations between nutrients and secondary metabolites within ripe Piper sancti-felicis fruits, showing that intraindividual variation of chemical traits can surpass interindividual variation and associations between chemical traits are scale-dependent, varying in …
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Siderophore production by heterotrophic bacterial isolates from the Costa Rica Upwelling Dome
… heterotrophic bacterial strategies for acquiring nutrients and trace elements is critical for elucidating their impact on biogeochemical cycling in the ocean. It is estimated that iron is a limiting nutrient for phytoplankton growth in over 30% of the open ocean, but still little is known about …
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Siderophore production by heterotrophic bacterial isolates from the Costa Rica upwelling dome
… heterotrophic bacterial strategies for acquiring nutrients and trace elements is critical for elucidating their impact on biogeochemical cycling in the ocean. It is estimated that iron is a limiting nutrient for phytoplankton growth in over 30% of the open ocean, but still little is known about …
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Beneficial Fungal Secretome and Synthetic Consortia to Improve Soybean Growth During Drought Stress
… tolerance through soil carbon storage, water and nutrient acquisition, and stress mitigation. Our goal was to build a naturally occurring fungal synthetic community (FunSynCom) to improve growth and drought resilience in soybeans. In this study, we isolated, identified, and characterized a set of …
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