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 93 for “"eels"”.
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Phylogenetics and Phylogeography of Moray Eels (Muraenidae)
… describes the evolutionary history of Moray eels: Muraenidae). Moray eels are apex predators on coral reefs around the world, but they are not well studied because of their cryptic habitats and occasionally aggressive behaviors. I provide the first molecular phylogeny of moray eels with …
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Tissue enzyme changes in air-exposed American eels.
American eels (Anguilla rostrata) are known to leave the water for excursions onto land despite lacking specialized air breathing organs. Other studies have established that the eel suffers from acidosis and hypoxemia as a result of this air exposure, but the survival of the eels despite these …
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Raman, Infrared, X-ray, and EELS Studies of Nanophase Titania
… and electron energy-loss spectroscopy (EELS). Detailed experiments were carried out on the effects of annealing on the Raman and infrared spectra of anatase nanocrystals. The frequencies of the zone-center transverse optical (TO) and longitudinal-optical (LO) phonons of anatase were …
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Selection of benthic habitat by yellow-phase American eels (Anguilla rostrata)
… habitat preference of yellow-phase American eels (Anguilla rostrata) and relationships between age and length with that preference. The thesis is comprised of two chapters: (1) an introduction and literature review on American eel life history, their habitat selection, and the study of …
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Embryotoxicity of dioxin-like chemicals extracted from American eels (Anguilla rostrata) from the St. Lawrence River System
… their complex life cycle, little is known about eels once they leave their freshwater habitats and migrate to the Sargasso Sea to reproduce. Ocean conditions, habitat destruction, disease, reduced lipid content, over-fishing, physical barriers (hydroelectric dams), and chemical contamination are …
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American Eel Distibution and Growth in Selected Tributaries of the James River
… Shoe Creek, Virginia, and captured 66 American eels. Eels were weighed (g) and measured (mm) and 61 individuals were implanted with Passive Integrated Transponders (PIT). Size distribution of the tagged eels ranged from 174-775 mm total length. The team returned to Shoe Creek in October of 1999 …
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BIO-ECOLOGICAL AND ANATOMICAL ASPECTS OF THE EUROPEAN EEL ANGUILLA ANGUILLA (L. 1758)
… migratory life stages of the European eel (glass eels and silver eels). Second, I described the glass eels’ migration temporal peak for the first time in the central-western Mediterranean in relation to the effects of main environmental factors. I also identified a spatio-temporal variability …
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Helminth infections of the European eel Anguilla Anguilla in the United Kingdom
… anguillae and P. bini. Overall, 101 eels (72.1 %) were infected with a total of 1504 helminths and these included gill monogeneans (prevalence = 35.7%), gastrointestinal nematodes (prevalence = 33.6%), the swim bladder nematode Anguillicoloides crassus (prevalence = 25.0%), …
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American Eel Subpopulation Characteristics in the Potomac River Drainage, Virginia
The demographic characteristics of American eels (Anguilla rostrata) are believed to vary with latitude and distance inland from the ocean; eels are generally thought to increase in length, age, and the proportion of females in inland and more northerly areas. Understanding this variation is …
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Collective excitations in layered materials with momentum-resolved electron energy loss spectroscopy
… electron energy loss spectroscopy (M-EELS), was undertaken. Because many of the material classes that exhibit these unusual ground states tend to be layered or quasi-two dimensional, M-EELS presents a promising approach to measuring the energy- and momentum-resolved charge density …
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Multi-dimensional Data Analysis in Electron Microscopy
… from an electron energy loss spectrum (EELS) tilt-series. The EELS analysis also led to the development of two new algorithms to extract EELS near-edge structure fingerprints from the original dataset. Both approaches do not rely on standards, are not limited to thin or constant …
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Collective modes in strongly correlated electron systems measured with momentum-resolved electron energy-loss spectroscopy
… electron energy-loss spectroscopy (M-EELS) can measure χ(q,ω) of strongly correlated materials at the low energy scales of interest. The ability to measure the momentum-dependence of the collective modes often leads to new insight about a material’s ground state. Here we use M-EELS to …
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Valence losses at interfaces in aluminium alloys
The aim of this project was to investigate EELS from two-layer systems and relate the results to the existing theory. Two systems were investigated, magnesium silicide platelets within an aluminium matrix and silicon precipitates within an aluminium matrix. Both systems were prepared through …
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Atomic resolution studies of oxide superlattices and ultrathin films
… contrast. Electron energy loss spectroscopy (EELS), together with STEM, can probe the local chemical composition as well as local electronic states of transition metals and oxygen. Both techniques have been significantly improved by aberration correctors, which reduce the probe size to 1 Å, or …
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Assessment of local abundance, demographics, health and exploitation of Chesapeake Bay American eel
… had a lower proportion of females, and American eels were older, slower growing and showed increased parasitism. Female American eels were larger, older, and had higher growth rates than other gender types. Local abundances were 10-fold higher in the Potomac River estuary in comparison to the …
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Electron Energy Loss Spectroscopy and Optical Properties of Plasmonic Nanostructure
… properties. Electron energy loss spectroscopy (EELS) is one of these tools, which is helpful for us to understand the interaction between fast moving electrons and nanomaterials. It could achieve very high spatial and energy resolution. Here, we develop a new finite-difference time-domain method …
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The crystal chemistry of hibonite: an indicator for oxygen fugacity during Solar nebula condensation?
… M3 site. Energy electron loss spectroscopy (EELS) in a transmission electron microscope (TEM) has been used to measure the Ti(3+)/Ti(tot) ratios on synthetic hibonite. Due to the low concentration of Ti in hibonite, which does not allow to determine with sufficient accuracy the absolute …
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Surface decomposition studies of trimethylgallium on silicon(100)
… (IR), and electron energy loss spectroscopy (EELS).
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An Investigative Study of Surface Interaction and Reaction on (2X1)platinum(110)
Investigation of CO on (2 x 1)Pt(110) using both EELS and UV/HREELS shows that electronic transitions are shifted compared to those of gas phase. Careful analysis reveals that these shifts are caused by sigma-donation and pi-back donation between CO and the surface, confirming the Blyholder model, …
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Search for evidence of fermi surface nesting in Bi₂Sr₂Ca₁Cu₂O₈
… rates. It was suggested in that same paper that EELS might be able to confirm the presence of Fermi surface nesting. We have attempted to use transmission electron energy loss spectroscopy in a novel way to search for evidence of Fermi surface nesting in the high T<sub>c</sub> superconductor …
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