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.
Results
Showing 1 to 15 of 15 for “"nitrate transport"”.
-
Computational dissection of nitrate transport mechanism
… per unit of added nitrogen. For plants, nitrate is one of the two major nitrogen sources, which is taken up from the soil through nitrate transporters. Despite recent breakthroughs in structural biology, our knowledge of the molecular nature and regulation of nitrate transporters is far …
-
Biochemical characterization of nitrate transport at the plasma membrane of plant cells using isolated vesicles
… This radiolabeled anion was used as a tracer for nitrate in membrane transport studies with isolated plasma membrane vesicles.
-
Identifying nitrate transport mechanisms and export dynamics using water age modeling and concentration-discharge relationships
… the Midwestern U.S. are a significant source of nitrate (NO3-) loss to surface waters. Water flow paths and residence times determine the contact length between NO3- and sub-surface material, controlling the rate of biogeochemical reactions and nitrogen removal via denitrification. A Nitratax N- …
-
Functional characterization of nitrate transporters in maize.
Nitrate is an essential nutrient for plant growth. Nitrate acquisition by roots and its intercellular translocation is mediated by nitrate permeable transport proteins. Nitrate transporters have been extensively studied in the model plant, Arabidopsis thaliana. Nitrate transporters belong to three …
-
Nitrate carrier induction and characterization in maize root plasma membrane using chlorate-36 as a radiotracer analog for nitrate
… maize plants have shown an apparent induction of nitrate uptake capacity when plants are transferred to a nitrate containing nutrient solution. Whether this phenomenon reflects a change in nitrate carrier activity at the membrane level or an effect of nitrate metabolism has not been determined as …
-
Nitrogen signalling in Arabidopsis thaliana
… the transcriptional level to N-deprivation or to nitrate per se. Most of these genes have not been characterized previously. Further selection of TF genes based on the responses of selected candidates to other macronutrients and abiotic stresses allowed to distinguish between TFs regulated (i) …
-
Synthesis and Study of Biomimetic Ion Channels: (1) Toward the Development of a Cyclic Peptide-Based Redox-Gated Channel, and (2) Investigations Into the Effect of Pore Size on the Ion Selectivity of an Aminocyclodextrin Channel
… macrocycle was synthesized and its transport properties were compared with those of an analogous channel with a larger beta-cyclodextrin pore. The anion transport profile of the alpha-cyclodextrin channel (ClO 4- > I- > Br- > NO3- > Cl-) differed from that of its beta-cyclodextrin …
-
In the Zone: the Effects of Soil Pipes and Dunes on Hyporheic and Riparian Zone Hydraulics and Biogeochemistry
… and agriculture which discharge excess nitrate and other pollutants into our waterways. Here, this dissertation seeks to understand the physical and biogeochemical processes which attenuate pollutants in stream corridors. The focus is hyporheic zones which form the interface between …
-
Transformation and fate of nitrate in northern prairie wetlands
… here addressed the transformation and fate of nitrate in northern prairie wetlands. A combination of wetland mesocosms and microcosms was utilized to conduct controlled and replicated experiments involving nitrate transformations with the overall objectives: (1) to estimate the capacities of …
-
Quantifying the Role of Mesoscale-Driven Processes of Nitrate Supply Within an Iceland Basin Eddy Dipole
… the mesoscale spatial variability in local nitrate transport and the net nitrate flux associated with an open ocean eddy dipole, using novel data from the SUV?6 ultra?violet (UV) nitrate sensor integrated with SeaSoar. The innovative, combined system provides high?resolution (2?3 km …
-
Modification of the SWAT Model to Simulate Hydrologic Processes in a Karst-influenced Watershed
… ability to model both discharge and nutrient transport in karst watersheds. The Soil Water Assessment Tool (SWAT) model was found to be appropriate due to its capability to represent almost all of the hydrological processes, its user-friendliness, and its ability to generate most of the …
-
Regulation of nitrate uptake and calcium signaling in arabidopsis
… required by plants, and its most abundant form, nitrate (NO3-), has been extensively used in fertilizers to improve crop yield. However, this has also led to increased environmental pollution due to leaching and volatilization. Improving nitrogen use efficiency (NUE) is one of the ways to reduce …
-
Flow and transport processes as affected by tillage management under monsoonal conditions in South Korea
… conditions and its impact on flow processes and nitrate transport was investigated. On hillslopes, we monitored surface and subsurface flow processes in four plastic mulched potato fields using a network of tensiometers, FDR sensors, runoff collectors and flow dividers as well as Brilliant Blue …
-
Studies on aluminum toxicity in an aluminum-sensitive cultivar of barley: impact on ion fluxes and calcium distribution
… calcium, potassium and ammonium and the anions, nitrate and phosphate was measured in an aluminum sensitive cultivar of barley. Aluminum (100 AM) was found to inhibit the influx of the cations, calcium (69%), ammonium (40%) and potassium (13%) while enhancing the influx of the anions nitrate …
-
Untersuchungen zu Nitrat-induzierbaren Proteinen der Plasmamembran von Chlorella saccharophila (Krüger) Nadson
… durch konstitutive und induzierbare Nitrat-Transportsysteme in der Plasmamembran (PM). Während auf molekulargenetischer Ebene Nitrat-Transporter codierende Gene eingehend untersucht sind, sind die Kenntnisse über die eigentlichen, die Transportsysteme konstituierenden Proteine sehr begrenzt. …