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 254 for “"diatom"”.
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A New Method for Computing Inelastic Molecular Scattering With Applications to Atom-Diatom and Diatom-Diatom Collisions
Made available in DSpace on 2015-05-12T21:41:41Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6801781.PDF: 3443454 bytes, checksum: 13c07063a77c4e97297dd09d1ddf6f5b (MD5) Previous issue date: 1967
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A turbulent diatom vs dinoflagellate phytoplankton biomass model
… dynamics of blooms are of interest to modellers. Diatom dominated phytoplankton blooms followed by dinoflagellate blooms are common in the Southern Benguela, and are often associated with Harmful Algal Blooms. A well-known ecological explanation for the succession of diatoms to dinoflagellates is …
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Architectures of Microbiality: From Diatoms to Diatom Houses
This dissertation examines the diatom—a microorganism found ubiquitously from oceans to kitchen countertops—as a resonant factor in understanding modernity. From the early 19th century to the mid-20th century, rapid advances in optical microscopy dramatically unveiled the microbial world, during …
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Carbonic anhydrase in the marine diatom Thalassiosira weissflogii
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1995.
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Epiphytic Diatom Community Structure in a Karst Riverine System
… goal of this study was to assess the epiphytic diatom community structure of two host species along a karst gradient in the upper Green River, Kentucky to a gain a better understanding of the role of diatoms in the food web. The host species studied were Podostemum ceratophyllum and Cladophora. …
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Functional and Molecular Diversity of the Diatom Family Leptocylindraceae
… and molecular diversity of Leptocylindraceae diatom species, the study of which can lead to a better understanding of long standing questions regarding the ecology and evolution of phytoplankton. A wide range of tools, spanning from microscopical observations and physiological measurements to …
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Engineering diatom peptides for the synthesis of silica nanomaterials
… medical, optical, energy, and mechanical fields. Diatoms, a class of eukaryotic algae, produce intricately-patterned silica structures under ambient conditions through a process initiated by post-translationally modified silaffin peptides that nucleate silicic acid. Designing these peptides would …
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Hydrothermal conversion of diatom frustules into barium titanate based replicas
… One organism, commonly referred to as a diatom, originates from algae and is found throughout the oceans on Earth. These diatoms possess skeletal structures, frustules, made from silicon dioxide. This chemical makeup limits the number of possible applications for which these structures …
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Diversity, Distribution and Evolution of the Planktonic Diatom Family Chaetocerotaceae
The number and abundance of diatom species in environmental samples are counted traditionally by means of light microscopy (LM). However, recognizing –let alone, counting- species is often challenging because of the existence of cryptic species and intraspecific phenotypic plasticity. Proper …
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Production and preservation of the Arctic sea ice diatom biomarker IP25
… conditions in the Arctic. Although the sea ice diatom origin of IP25 was established previously, the nature of its production within sea ice, along with its transport through the water column to underlying sediments and its short-term preservation therein, had not been investigated in any …
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Oxygen isotopes in diatom silica : a new understanding of silica-water oxygen isotope fractionation in diatom frustules and an application of diatom d180 values as a record of paleohydrologic variability in a middle-Pleistocene lacrustine core from the Valles Caldera, New Mexico
I present oxygen isotope data from modern diatom frustules that were collected from freshwater systems in the Jemez Mountains of northern New Mexico. The frustules display a constant silica-water fractionation over the measured temperature range (5.1 to 37.8°C) regardless of species. This …
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The Paleolimnology of Irondequoit Bay: Trophic History Inferred from Sedimentary Diatom Assemblages
This master thesis analyzes the condition of diatoms the Irondequoit Bay. The author was able to gather data from the past 150 years of the Bay’s history. Three core samples were taken from the bay, and each core was given a different test. These tests include diatom analysis, radiometric dating …
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Genetic, physiological and ecological diversity of the diatom genus <i>Leptocylindrus</i>
Diatoms are among the most productive photoautotrophic organisms on Earth. Within the diatom genus <i>Leptocylindrus</i>, two species, <i>L. danicus</i> and <i>L. minimus</i>, are reported as abundant in coastal waters worldwide and in the Gulf of Naples (GoN). This thesis aimed at a closer …
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THE DEVELOPMENT OF DIATOM-NUTRIENT PALAEOLIMNOLOGICAL INFERENCE MODELS FOR UK LOWLAND RESERVOIRS
… study represents the first attempt to develop diatom-based palaeolimnological inference models for the assessment of eutrophication in UK lowland reservoirs. Models are developed from a 46-reservoir calibration set comprising surface sediment diatom assemblages and contemporary environmental …
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The diatom record: Reconstructing historically recent environmental change in the Knysna estuary
… This study represents the first highresolution diatom record from the Knysna Estuary encompassing the last ∼680 years. Diatom analysis was employed to reconstruct salinity, nutrients, and saprobity variables in addition to inferring community structure and trophic status over time by creating an …
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Identification and characterization of diatom kinases catalyzing the phosphorylation of biomineral forming proteins
Diatoms are unicellular photosynthetic algae that display intricately patterned cell walls made of amorphous silicon dioxide (silica). Long-chain polyamines and highly phosphorylated proteins, silaffins and silacidins, are believed to play an important role in biosilica formation. The phosphate …
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Reactive Scattering of an Atom by a Diatom: The Coupled Arrangement Wavefunction Method
A formalism for reactive scattering in three dimensions is developed. It is shown to be equivalent to the coupled T and K operator methods of Kouri, Craigie and Secrest. The relationship between the two methods shows that the coupled operator methods as previously presented are computationally not …
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