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 20 of 20 for “"nutrient exchange"”.
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The Spatiotemporal Dynamics of Nutrient Exchange at the Arbuscule
… arbuscular mycorrhizal (AM) fungi to meet this nutrient demand. AM symbiosis involves the fungus-to-plant transfer of phosphorus and nitrogen, and the reciprocal plant-to-fungus transfer of carbon at specialised structures within plant root cells, the arbuscules. While many studies have …
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Estuarine sediment nutrient exchange: the importance of physical transport mechanisms and benthic micro-communities
… and physical transport mechanisms on sediment nutrient flux were investigated for two nearshore sediment types on Virginia’s Eastern Shore. Subtidal sandy mineral sediments were conducive to water transport and subsequently influenced by groundwater discharge to a greater degree than less …
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Transport processes in the arbuscular mycorrhizal symbiosis
The nutrient exchange between plant and fungus is the key element of the arbuscular mycorrhizal (AM) symbiosis. The fungus improves the plant’s uptake of mineral nutrients, mainly phosphate, and water, while the plant provides the fungus with photosynthetically assimilated carbohydrates. Still, the …
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Engineering polymer biomaterial interfaces for promoting cellular morphogenesis
… of most human tissues, enabling oxygen and nutrient exchange, as well as facilitating paracrine signaling with surrounding epithelial cells. Fully-defined and tunable synthetic ECMs that support the generation of vascular network structures in dense tissue environments represent a path …
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Sex Differences In Endothelial FoxO1 Response To Nutrient And Oxidative Stress
… for vascular homeostasis, regulating blood flow, nutrient exchange, and immune responses. EC dysfunction contributes to diseases such as type 2 diabetes, atherosclerosis, and hypertension, with sex-specific differences in disease progression. Our lab previously observed sex differences in the …
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A NOVEL DROPLET-BASED PLATFORM FOR TUMOR SINGLE-CELL ENCAPSULATION AND METASTATIC MULTICELLULAR CLUSTER MODELLING
… The platform improves droplet stability, nutrient exchange, and long-term culture capacity. It incorporates inertial focusing and on-chip sample enrichment techniques to enhance cell loading efficiency and reduce variability. Functional analysis revealed the influence of biophysical stress …
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Adaptation to environmental stress in the human placenta
… fetal growth by acting as a substrate for nutrient exchange between the mother and the fetus. Environmental factors such as altitude have been shown to result in reduced maternal-fetal exchange leading to reduced birth weight. To determine if differences in gene expression maybe …
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Field Observations and Numerical Simulations of Groundwater Dynamics Within Cabretta Island, A Georgia Barrier Island
… for knowledge of groundwater resources and nutrient exchange in coastal settings has increased in response to rapid population growth. I present field and numerical results that 1) provide a better understanding of groundwater dynamics during calm weather periods, and 2) investigate the …
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The role of SPARK-I receptor-like kinases in the arbuscular mycorrhizal symbiosis
… of the arbuscules, creating a hub for nutrient exchange and potentially for plant-fungal communication. Receptor-like kinases (RLKs) allow plant cells to sense and respond to their environment and are crucial for signalling during biotic interactions. A rice RLK, ARBUSCULAR …
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Regulation of amnion induction during the human formative pluripotency transition
… supports the embryo by providing protection, nutrient exchange, and signalling cues. Unlike rodent models, in humans, the amnion segregates from the epiblast shortly after implantation; however, this process remains unclear due to limited access to peri-implantation embryos. In this thesis, I …
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Mangrove ecosystem dynamics and clearance impacts
… to have minor impacts on sediment:water column exchange of inorganic nutrients, which was low at both intact and cleared sites. However, clearance increased the amount of CO2 released from the sediment into the atmosphere by more than 2-fold. Lower inorganic nutrient fluxes within cleared and …
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Exploring B vitamin biosynthesis and exchange in understudied marine stramenopiles and their communities
… play essential roles in the cycling of nutrients, primary productivity and form the basis of all food webs. These single-celled organisms do not live in isolation, rather they form complex communities, a dominant feature of which is the exchange of nutrients. In many areas of the ocean …
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Characterization of the Swine Gut Microbiome Dynamics, Culturomics and Probiotics
… as development of the gastrointestinal tract, nutrient exchange, immune defense against foreign pathogens and growth performance. Microbiome-host communication changes with age. Despite recent advances in understanding the swine gut microbiome at different growth stages, a comprehensive …
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Roots as agents of soil change over time and as mediators of humanity’s imprint on Earth’s critical zone
… roots mediate the movement of materials such as nutrients and carbon (C) across Earth’s surface. Roots allocate fixed C to processes that govern nutrient uptake, and in doing so redistribute soil resources. However, plant C for nutrient exchange strategies are not well understood and are …
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Experimental and Theoretical Study of Carbon Dynamics in an Algal-Bacterial Co-Culture
… photosynthesis, respiration and inter-species nutrient exchange, which underpin the microbial contribution to the carbon cycle. The multitude of species and interactions that exist within a natural microbial community makes studying specific inter-species nutrient dynamics challenging. The …
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Beliefs and Practices of Expert Respiratory Care Faculty on Critical-Thinking Learning: a Case Study
… the relationship between factors that govern nutrient exchange where mother and child meet in the placenta.</p> <p>Conclusions. The development of critical thinking results from the successful implementation of sound beliefs. An effective respiratory therapy learning environment has key …
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Spatio-temporal regulation of pre-symbiotic signalling in arbuscular mycorrhizal symbiosis
… fungi, underpinned by a mutualistic nutrient exchange. In this intimate partnership, the fungus dynamically and asynchronously colonises the plant root system and cortex cells. Symbiosis development must therefore require spatio-temporally fine-tuned molecular control mechanisms. …
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The Effects of Whole Genome Duplication on Functional Traits and Interactions With Arbuscular Mycorrhizal Fungi
… tests the hypothesis that neopolyploids are more nutrient limited by comparing growth and leaf functional trait responses of diploids, neotetraploids, and established tetraploids of Heuchera cylindrica to different levels of nutrient supply. The results support the hypothesis that neopolyploidy …
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The Effects Of Whole Genome Duplication On Functional Traits And Interactions With Arbuscular Mycorrhizal Fungi
… tests the hypothesis that neopolyploids are more nutrient limited by comparing growth and leaf functional trait responses of diploids, neotetraploids, and established tetraploids of Heuchera cylindrica to different levels of nutrient supply. The results support the hypothesis that neopolyploidy …
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Soil microbial community dynamics associated with agricultural crops
… decomposition of organic matter, the cycling of nutrients to crops and can induce systemic resistance. They also drive global biogeochemical cycles that influence the climate, which in turn determine the growing environment for crops. Soil microbes also interact with crop plants directly via …