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 15 of 15 for “"compound eye"”.
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Inverted compound eye camera for second generation MRI compatible SPECT system
… SPECT system, MRC-SPECT-II, based on an inverted compound eye (ICE) gamma camera concept inspired by compound eyes often found in small invertebrates. The MRC-SPECT II system is constructed with a total of 24 ICE-camera panels that consists of a very large number (up to 1500) of independent …
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Development of the MRC-SPECT-II system: a MR-compatible small-animal SPECT system based on semiconductor imaging spectrometers and a Synthetic Compound-Eye gamma camera design
… and an innovative geometry named Synthetic Compound-Eye gamma camera, bioinspired to compound eyes often found as vision system in small invertebrates. Preliminary studies demonstrate that the proposed system offers an unprecedented spectroscopic performance (1.71 ± 0.28 keV at 122 keV) in a …
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FOXO is the Mediator Linking Temporal Differentiation and the Insulin Signaling Pathway
… neuronal photoreceptor cells in the Drosophila compound eye. The link between the InR pathway and temporal differentiation is significant, because of the implication that external factors, e.g. nutrition, are tightly coupled to the timing of differentiation. This proposal tests the hypothesis …
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Role of Drosophila Rap/Fzr (Cdh1) in retinal axon targeting and its interactions with Loco, Liprin-a and Ras
The development of the wild type Drosophila compound eye involves stereotypical targeting of photoreceptor axons to the specific layers of the optic ganglion, medulla and lamina, in the third instar larvae. To test the hypothesis that ubiquitin ligases play an important role during retinal axon …
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Development of high performance single photon emission computed tomography systems for simultaneous nuclear molecular imaging and magnetic resonance imaging
… for simultaneous NMI and MRI, an inverted compound-eye (ICE) gamma-ray camera was proposed here for SPECT imaging applications and experimentally verified through a prototype system. The MRC-SPECT-II was designed utilizing 24 ICE gamma camera modules and consisted of more than 1,500 …
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Variability in the Firing of Nerve Impulses in Eccentric Cells of the Limulus Eye
… was studied is the eccentric cell in the compound eye of the horseshoe crab, Limulus polyphemus. In Part I a theory is presented which accounts for the variability in the response of an eccentric cell to light. The main idea of this theory is that the source of randomness in the impulse …
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Polymer based microscale and nanoscale technologies for optical and biomedical application
… by mimicking the wide acceptance angle found in compound eye of insects. I integrated lens, conic spacer and light guide to concentrate and redirect sunlight into small area where PV cell can be installed. My design can have total concentration up to ~40 for acceptance angle of 15à °.</p> …
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THE CRAYFISH VISUAL SYSTEM: INTRACELLULAR STUDIES AND MORPHOLOGIES OF IDENTIFIED INTERNEURONS
A semi-intact eye-cup preparation was developed which maintains visual responses and enables intracellular recordings to be made from the optic lobes of the crayfish compound eye. Sustaining fibers (SFs) were impaled with lucifer yellow electrodes near their entrance to the second optic ganglion or …
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Examining external morphological characteristics of Lucilia sericata pupae for age estimation in medico-legal investigations
… the development and the pigmentation of the compound eye also provided valuable time-breaks it's timeline.
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Spectral and ocellar inputs to honeybee motion-sensitive descending neurons
… most flying insects, have three ocelli (simple eyes) located on the top of the head, in addition to the compound eyes. However, the exact function of the bee ocelli and the information computation between the ocelli, compound eyes and central brain remain unclear. In this thesis, I investigate …
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Spectral and ocellar inputs to honeybee motion-sensitive descending neurons
… most flying insects, have three ocelli (simple eyes) located on the top of the head, in addition to the compound eyes. However, the exact function of the bee ocelli and the information computation between the ocelli, compound eyes and central brain remain unclear. In this thesis, I investigate …
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Statistics, geometry, and mechanical states in cellular matter
… right at the transition. The wildtype Drosophila compound eye exhibits regular hexagonal structure of facets called ommatidia but certain genetic mutations disrupt regulation and lead to generation of topological defects. With conventional order measures in statistical mechanics, we demonstrate …
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Rhabdomerorganisation und –morphogenese im Komplexauge von Drosophila
Sehzellen von Insekten sind epitheliale Zellen mit einer charakteristischen, hochpolaren Morphologie und Organisation. Die molekularen Komponenten der Sehkaskade befinden sich im Rhabdomer, einem Saum dicht gepackter Mikrovilli entlang der Sehzelle. Bereits in den 70er Jahren des letzten …
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Visual Adaptations and Behavioural Strategies to Detect and Catch Small Targets
… summarised in the following list: 1. Thecompoundeyeofinsectsgenerallyhasmuchpoorerresolutionthanthatofcameratype eyes. Poor resolution is exacerbated in smaller insects that cannot commit the resources required for eyes with large lenses that facilitate high spatial resolution. …
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Theoretical and experimental assessment of the optical response of planar microlens arrays
The purpose of this thesis is to develop a theoretical method to estimate the optical properties and response of a homogenous, apposition microlens array. While other similar studies of microlens arrays have been performed, none were found to determine the total field of view, overlap in the field …