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 161 for “"Snail"”.
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Dorsal-Ventral Patterning in the Mud Snail, Ilyanassa obsoleta
… of the dorsal-ventral axis in the mud snail, Ilyanassa obsoleta. Ilyanassa and other spiralians utilize an embryonic organizer to induce dorsal identity, and thus establish the bilateral axis. The D macromere embryonic organizer in Ilyanassa is specified at the four-cell stage by the …
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Context specificity of associative learning in the snail Cornu aspersum
El presente trabajo es una investigación experimental de dos efectos contextuales del aprendizaje (inhibición latente o IL y renewal) en el caracol Cornu aspersum mediante procedimientos de Condicionamiento Clásico. La exposición repetida a un estímulo condicionado o EC (olor) sin consecuencia …
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Population Dynamics and Productivity of the Prosobranch Snail Goniobasis Potosiensis
… in the James River, Missouri. A total of 24,004 snails were collected and measured. The species was univoltine and individuals lived from 19 to 21 months. Recruitment occurred from June to August and followed a progressive wave from upstream down. Mean lengths ranged from 0.7 mm to 13.7 mm with …
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The evolution of freeze tolerance in a historically tropical snail
… tolerance strongly influences range. The snail Melampus bidentatus occurs in coastal salt marshes in the western Atlantic and Gulf of Mexico. I have used sequence data from one mitochondrial (CO1) and two nuclear markers (histone H3 and a mitochondrial carrier protein, MCP) to identify …
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The Role of Snail Homolog 1 in Embryonic Stem Cell Differentiation
… show that the Wnt-dependent transcription factor Snail homolog 1: Snail) is expressed and capable of inducing EMT in differentiating ES cells. In addition to EMT, Snail accelerates differentiation, promotes mesoderm commitment, and restricts markers of primitive ectoderm and epiblast. Snail's …
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Interacting Premotor Networks Mediating Behavioral Selection in the Predatory Marine Snail Pleurobranchaea Californica
These results suggest that premotor neurons may have distinct multifunctional or dedicated roles in behavioral selection. Multifunctional neurons like As1-4 may excite multiple networks, whereas one role for dedicated network neurons is to exclude incompatible behavior by inhibiting other …
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Interacting Premotor Networks Mediating Behavioral Selection in the Predatory Marine Snail Pleurobranchaea Californica
These results suggest that premotor neurons may have distinct multifunctional or dedicated roles in behavioral selection. Multifunctional neurons like As1-4 may excite multiple networks, whereas one role for dedicated network neurons is to exclude incompatible behavior by inhibiting other …
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Cell Fate Determination Along The Anterior-Posterior Axis In The Mud Snail Ilyanassa obsoleta.
Previous studies in the mud snail, Ilyanassa obsoleta, described a novel centrosome- dependent mechanism to differentially distribute mRNAs within the embryo during the first 7 cleavage cycles of development (Lambert and Nagy 2002). I hypothesized that the simplest explanation to account for the …
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Reconstructing Australia’s late Quaternary climate from the geochemistry of lake sediments and snail shells
… clumped isotope composition (Δ47) of freshwater snail shells from Blanche Cave, also in south-eastern Australia (Chapter 6). Δ47 analysis allows calculation of the growth temperature of carbonate minerals (e.g. snail shells), independent of organism, carbonate phase, or formation water …
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The initiation of action potentials and the passive electrical properties of identified snail neurones
… of some identified neurones of the garden snail. The membrane time constants for the group of neurones studied had an average value of 43 ms. The nonlinear properties of snail neurones were characterised by measuring the harmonic content of the voltage response to a sinusoidal current …
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Freshwater snail diversity in relation to Schistosomiasis in the middle Zambezi basin in Lusaka Province
… basin in Lusaka province to determine freshwater snail diversity, its relationship to the presence of schistosomiasis and the impact of prevailing environmental factors on snail diversity. The study was carried out during the cool-dry season (July), hot-dry season (October) and hot-wet season …
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Thermal Tolerances of an Endemic Hot Spring Snail Physella wrighti Te and Clarke (Mollusca: Physidae)
… and Clarke, 1985) is an Endangered freshwater snail endemic to the Liard Hot Springs in northern British Columbia. It inhabits water temperatures from 23.5oC to 36oC and is active year-round. Despite its conservation status, little else is known about this species. To advance our understanding …
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Cholinergic and peptidergic responses of pedal A cluster cells of the pond snail lymnaea stagnalis
… mimics its action. In the pulmonate freshwater snail Lyinnaea stagnalis ACh and FMRFamide have been investigated in the neurones of the respiratory, locomotory and feeding systems. The aim of this investigation is to characterise the effects of ACh and FMRFamide, and candidate antagonists on …
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Patterning the Mud Snail Ilyanassa obsoleta: The Role of Cell Signaling and Asymmetric Protein Localization
The polar lobe of Ilyanassa is asymmetrically partitioned into the D lineage of cells. Two of these cells, 3D and 4d, induce proper axial cell fate patterning in the embryo. Based on known embryological data in Ilyanassa, I hypothesized that Notch signaling would be required for this induction. I …
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Untersuchungen zur Assoziation des transkriptionellen Repressors Snail aus Drosophila melanogaster mit den Korepressoren CtBP und HDAC1
… essentiell. Der Zinkfinger Repressor Snail etabliert die Grenze zwischen prospektivem Mesoderm und Neuroektoderm im frühen Embryo. Während Studien, die sowohl eine physikalische als auch genetische Interaktion zwischen Snail und dem Korepressor CtBP zeigten, auf einen CtBP-vermittelten …
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