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 1037 for “"abiotic"”.
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Radiactive particle biotic and abiotic processes
… different compartments. A protocol for the abiotic transformation of radioactive particles has been developed within the framework of EC and IAEA research projects and has been applied on a range of particles from various sites. Methods for the characterisation of single radioactive …
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The Abiotic and Biotic Reduction of Bromate
This study demonstrated that non-biologically active GAC filtration cannot provide sustained bromate removal whereas BAC filtration can provide sustained removal under a wide variety of water quality conditions.
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Epigenetic Responses of Arabidopsis to Abiotic Stress
Weed resistance to control measures, particularly herbicides, is a growing problem in agriculture. In the case of herbicides, resistance is sometimes connected to genetic changes that directly affect the target site of the herbicide. Other cases are less straightforward where resistance arises …
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Abiotic stressors in the dogwood anthracnose complex
Acidic precipitation reportedly enhances disease severity of dogwood anthracnose (DA) caused by Discula destructiva, on Cornus florida, the flowering dogwood. Seedlings were subjected to acidic fog episodes at pHs 2.5, 3.5, 4.5, and 5.5, using a simulated acidic rain solution. Leaf discs from these …
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Abiotic and Biotic Factors Shaping Plant-Microbe Interactions
… understanding. Given that the biotic and abiotic contexts of ecological communities is rapidly shifting due to anthropogenic change, understanding the factors that shape plant-microbe interactions will allow us to make more accurate predictions of ecological interactions both presently and …
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Biotic and abiotic mechanisms shaping multi-species interactions
… four data chapters that examine the biotic and abiotic mechanisms that shape multi-species interactions in both tropical and temperate ecosystems. The first three data chapters (Chapters 2–4) were completed within a Neotropical rainforest in Costa Rica and focus on one plant genus, Piper …
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Soil Heterogeneity in Arid Shrublands: Biotic and Abiotic Processes
… whole ecosystem processes. The biotic and abiotic processes that shape arid landscapes operate at different spatial and temporal scales but ultimately control soil moisture variability and ecosystem patterns and processes. This dissertation attempts to expand the canopy interspace binary …
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Biotic and Abiotic Drivers of Plant-Pollinator Interaction Rewiring
… must consider how changes to biotic and abiotic conditions are likely to affect not only the organisms present in a community but also the interactions between them.
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Genetic Regulation of Maize and Sorghum under Abiotic Stress
Climate extremes of temperature, drought and flooding continue to challenge global agricultural production and food security. If modeling studies are accurate, climate variability and drought will be a more prevalent occurrence in the future, not only inhibiting grain yield but also stressing water …
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Abiotic pathways of mercury methylation in the aquatic environment
… the aquatic environment. The importance of the abiotic pathway of mercury methylation was assessed by a thorough examination of the kinetics of these reactions in various experimental conditions, relevant to environmental situations. The amount of methylmercury formed in the course of the …
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Abiotic nitrate reduction by redox activated iron-bearing smectites
… bacteria in the studied profiles points to an abiotic source of nitrate reduction that likely involves mineral phases containing iron. The ability of reduced, iron-bearing clay minerals to in turn reduce nitrate was investigated using SWa-1 chemically reduced by sodium dithionite. Analysis of …
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Abiotic and Biotic Polymer Degradation to Inform Sustainable Design
… first chapter, I develop and apply a sequential abiotic (photodegradation and hydrolysis) and biotic degradation test to a diverse suite of 18 polymers, including novel polyhydroxyalkanoates polyesters, commercially available bio-based polymers (e.g., polylactic acid, poly-3-hydroxybutyrate), and …
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Crop traits to improve plant water relations under abiotic stresses
The present dissertation aims to discuss plant ecophysiological, biochemical, and molecular traits that are involved in the tolerance of environmental stresses that affect agricultural production and threat food security: agricultural drought, soil salinity, and nitrogen management. The challenges …
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Are Barley Dwarfing Genes Important in Tolerance to Abiotic Stress?
… DELLA wild-type and mutant barley plants to abiotic stress conditions (salt stress and heat shock) it was established that the increased survival conferred by stabilised DELLA that was reported in Arabidopsis was also applicable to barley, and that survival of the LoF barley mutants was …
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Breeding broccoli resilient to multi-abiotic stresses using genome editing
… of all adverse environmental conditions or abiotic stresses. NAC-LIKE, ACTIVATED BY AP3/PI (NAP), a NAC (NAM, ATAF1/2, and CUC2) family transcription factor, is a key regulator of abiotic stress-induced senescence. Knocking BoNAP out via CRISPR/Cas9 genome editing in broccoli (Brassica …
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Ozone Inactivation and Attachment of Listeria Monocytogenes to Abiotic Surfaces
L. monocytogenes 104035 and LO28 wild-type strains showed motility when gown at both 24 and 37°C although flagellin production was reduced during growth at 37°C. Both the wild-types and flagella minus mutants showed similar cells counts when attached over time on polystyrene microtiter …
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Abiotic and Biotic Perchlorate Removal in an Activated Carbon Filter
This research has demonstrated that, while abiotic perchlorate removal by GAC is ineffective, BAC filtration can provide efficient, sustained perchlorate removal under a broad range of operating conditions and water quality characteristics.
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Ammonia-monooxygenase-mediated cometabolic biotransformation and abiotic transformation of micropollutants
… could also be detected in hydroxylamine added abiotic samples. Thus, in addition to cometabolism carried out directly by AMO, an abiotic transformation route indirectly mediated by AMO might also present during MP biotransformation. Taken together, this study advances fundamental knowledge of …
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Abiotic Factors Underlying Stress Hormone Level Variation Among Larval Amphibians
Anthropogenic disturbances can alter the abiotic composition of freshwater systems. These compositional changes can act as physiological stressors towards system inhabitants. However, little is known about how these altered abiotic factors influence stress hormones (corticosterone) in larval …
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