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 38 for “"mollusk"”.
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Multiscale mechanical studies of nacre from gastropod mollusk Trochus Nilocitus
(cont.) revealed jagged and branched crack fronts at plate interface, tortuous crack paths, non-uniform angles of polygons (suggesting possible intrinsic deformability and displacement/sliding). The technique of nanoindentation was carried out on individual aragonite tablets using a diamond-coated …
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Current and historic freshwater mollusk distributions of the upper Coosa River Basin
… (TNARI) survey activities of freshwater mollusks within the upper Coosa River basin (UCRB) from 1998 to 2003. Survey results of 4 different TNARI studies, a total of 515 separate collections, are presented. My component of the study examined 231 sites primarily in the Coosawattee and …
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Effects of the 1982-1983 El Niño mega event on bivalve mollusk biomineralization
Marine bivalve mollusks are valued as climate change recorders due to predictable growth rates and the recording of the ambient seawater environment into their shells (e.g., temperature, dissolved inorganic carbon (DIC)). Bivalves that endure extreme environmental perturbations also exhibit …
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Ecology of Neotropical Arboreal Snakes and Behavior of New World Mollusk-Eating Snakes
… of the snake community, and the diet of mollusk-eating snakes. I studied arboreal species to understand interspecilic relationships in several morphometric characters and to examine preferences in habitat. There were significant morphometric differences in relative length of jaw, mass, …
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Quantitative Ecological and Taphonomic Patterns in Late Cenozoic Mollusk-Dominated Marine Fossil Assemblages
Applications in paleontological research are far from being limited to taxonomic collection and identification. Nor is such research limited to working solely on fossil data. Actualistic paleontology is the study of modern or recent organisms and processes to better understand those of the past. …
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Native and non-native mollusk prey vulnerability to juvenile black carp (Mylopharyngodon piceus) predation
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-05-01
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It’s clam-plicated: how functional traits influenced extinction patterns of Neogene West Atlantic mollusks
Because mollusks are not only indispensable members of marine ecosystems, but are also essential human food sources throughout much of the world, their patterns of survival under future anthropogenic climate change conditions must be predicted in order to focus conservation efforts. Bivalves and …
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Quantitative approaches and applications to the sequence stratigraphy and biodiversity of Pleistocene – Holocene mollusk communities from the Po plain, Italy and San Salvador Island, the Bahamas
The following chapters presented here use modern ecological data and modern marine systems to evaluate past marine depositional settings and the preservation potential of various environments in the geological record. While the chapters in this dissertation vary in terms of study area, sedimentary …
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Effects of sewage treatment plant effluents on mollusks and fish of the Clinch River in Tazewell County, Virginia
The Clinch River is renown for its rich mollusk and fish assemblages, including many endemic species. New sewage treatment plants (STP's) have recently been constructed along the Clinch River in Virginia, raising concern because of the disappearance of mollusks below existing STP's. Field and …
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Updip Sequence Development on a Mixed Carbonate-Siliciclastic Continental Shelf, Paleogene, North Carolina, Eastern U.S.A.
… hardground on Cretaceous shoreface/shallow-shelf mollusk facies. It is overlain by a thin Paleocene sequence of deeper offshore, glauconitic fine sands to deep marine silt-shale. Five regionally mappable, vertically stacked Eocene sequences are 0 to 30 m thick and contain coastal sands, shoreface …
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Some Fossil Mollusks of Yakima County, Washington
… is designed to locate and describe known fossil mollusk sites in Yakima County, Washington. As part of this thesis a detailed comparison of two sites will be given, including identification and a systematic description of the specimens, as well as the correlation and interpretation of the fossil …
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Moluscos encontrados no Sambaqui de Camboinhas, Itaipu, Niterói, Estado do Rio de Janeiro, Brasil
… The conchological characterization of the mollusk species found in the site is given, as well as their utilization, and geological and geographical distribution. Represented on the site are three species of marine gastropods, one of terrestrial gastropod, and ten of marine bivalves.
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Paleoecology of late quaternary Molluscan-Ostracod assemblages from the Norwood site, southeastern Minnesota
<p>Well-preserved fossils, including mollusks, ostracods, beetles and plant remains were extracted from sediments at the Norwood Site in southeastern Minnesota during July, 1977. Stratigraphic units, in ascending order, were: (1) sandy claystone, (2) clayey siltstone, (3) sandy siltstone, and (4) …
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Developing cultivated mollusks through establishing primary cell culture methods of Eastern Oyster, Crassostrea virginica, as a model bivalve
… no continuous cell lines of food-relevant mollusks have been established so far. This study used the adult Eastern Oyster, Crassostrea virginica, as a model bivalve to study the decontamination, cell dissociation, and culture conditions suited for mollusk adductor muscle cells. Oyster …
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The mineralogy and chemistry of modern shallow-water and deep-sea corals
… with aragonite produced by other organisms (mollusk), synthetically (abiogenic precipitation in aragonite-supersaturated seawater and freshwater), and in natural geological settings (abiogenic). Coral aragonite crystallography does not resemble mollusk aragonite (aragonite formed with a …
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Anticancer and antibiotic leads from marine organis
… F, isolations of new peptides from the mollusk, Elysia rufescens and anticancer drug leads from the NCI repository, as well as chemical regulation of antibiotic production from marine Pseudomonas aeruginosa were investigated. Kahalalide F (KF) is a potent anticancer lead isolated from …
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Seasonal gonadal changes in two bivalve mollusks in Tomales Bay, California
<p>Pododesmus cepio Gray (1850), a bivalve mollusk of Family Anomiidae, is native to the Pacific coast of North America and common in Tomales Bay, California. A small population of the European oyster, Ostrea edulis Linnaeus (1758), is being raised experimentally at the Tomales Bay Oyster Company. …
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Cataloging the Precontact Andes: A Comprehensive Material Study of Spondylus, the Sacred Shell
Precontact Andean societies have used the vibrant mollusk, Spondylus, for over 5,000 years. Although the shell originated in Ecuador and northern Peru, it was widely employed in offerings, jewelry, and elite iconography throughout the central Andes. Despite extensive archaeological research on …
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Analysis of D-Aspartate as a Signaling Molecule in the Aplysia Californica Central Nervous System Using Capillary Electrophoresis and Radioisotopic Labeling
… in the central nervous system. The mollusk Aplysia californica has shown high levels of D-Asp in the neural ganglia; and this, along with its relatively simple invertebrate system, makes Aplysia a viable model system for studying the function and neurochemistry of D-Asp. Using …
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Mapping of elastic modulus and hardness in Trochus niloticus seashell nacre by nanoindentation
… nacre found in the shell of the gastropod mollusk Trochus niloticus. Nacre is a hierarchical biocomposite composed of mineral tablets of 95 weight % calcium carbonate (CaCO3) in the aragonite mineral form and a biomacromolecular organic matrix. Nanoindentation was carried out in a pattern …
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