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 46 for “"body plan"”.
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Using Xenopus laevis to study the mechanisms governing the early germline development and the formation of vertebrate body plan
… during Xenopus embryogenesis to establish the body plan. Ligand-independent activation of RTKs allows dissecting the receptor-specific signaling outcomes from the pleiotropic effects of the ligands. In this regard, RTK intracellular domains (ICDs) are of interest due to their ability to …
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How to build a chordate: Multiscale decomposition of axial morphogenesis in the amphioxus, Branchiostoma lanceolatum
… of the chordate phylum are united by a shared body plan – a stereotypical composition and topology of tissues that emerges in the wake of gastrulation and defines the major anatomical patterns emerging in later development. For this reason, although there is remarkable anatomical diversity …
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The evolutionary emergence of neural organisation in computational models of primitive organisms
… in concert with the constraints enforced by body plan morphology and a need to process information eciently and robustly. Whilst these factors are two smaller parts of a much greater whole, their impact during the evolutionary process cannot be ignored, for they are fundamentally signicant. …
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Investigating the Patterns of Convergence in Pectoral Girdle Reduction During the Evolution of Limblessness in Lerista (Scincidae)
… have evolved a snake-like, elongate, limbless body plan. Studies of the patterns of limb reduction have revealed a close relationship between the reduction of the limbs and body elongation; however, the loss of the skeletal elements that support the limb, the pectoral girdle, has been less …
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KEY DEVELOPMENTAL EVENTS IN THE ORIBATID MITE, ARCHEGOZETES LONGISETOSUS, AND THE EVOLUTION OF CHELICERATE BODY PLANS.
… Cambrian. The chelicerates display a conserved body plan comprising of an anterior prosoma and a posterior opisthosoma. The prosoma comprises the segments bearing the chelicerae, pedipalps and the four pairs of walking legs. The opisthosoma is more variable, and either contains no appendages …
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Comprehensive single-cell transcriptional profiling of the regenerative planarian Schmidtea mediterranea
… cell types and cell states in a complete animal. Planarians are freshwater flatworms renowned for their capacity for whole-body regeneration. They possess a complex body plan with multiple distinct tissues. They also possess a population of dividing cells, called neoblasts, which contain …
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Generation of A L. Hesperus embryonic cDNA library for the isolation of genes involved in early pattern formation
… arachnids also use this system to organize their body pattern. To enable studies of the Westem black widow spider, Latrodectus hesperus, an embryonic eDNA library and a fixation protocol were developed for L. hesperus embryos. The generation of these tools will allow comprehensive analysis of …
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Regulation of Actin Dynamics During Drosophila Germband Extension
… embryo to begin to lay out the adult body plan. In fly embryos, this is known as germband extension and is mainly driven by cell intercalation or neighbor exchange by planar polarized cell-cell interface contraction to shorten the tissue along the dorsal-ventral axis. In this thesis, I …
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Appendage development and early Distal-less regulation in arthropods: A study of the chelicerate Tetranychus urticae (Acarida)
… and events underlying evolution of the myriad body plan morphologies expressed both genetically and phenotypically within the animal kingdom. Arthropods exhibit an astounding array of morphological diversity both within and between representative sub-phyla, thus providing an ideal phylum …
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Postembryonic Polarity Modification in the Acoel Convolutriloba longifissura
<p>Metazoans establish the bilateral body plan early in embryogenesis by patterning orthogonal body axes with polarity that is unaltered during the lifetime of most animals. While some organisms re-establish/modify body axes during regeneration and asexual reproduction, the acoel flatworm …
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Hierarchy and CIS-Regulation in Drosophila Segmentation: Rules for Pattern Formation and Clues to Evolution
… segmental pattern that underlies the Drosophila body plan. The analysis clarifies the primary and secondary pair rule classification system and suggests certain organizational principles in pair rule cis-regulation.</p>
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Hox Targeting in Vertebrate Forelimb Induction: Expression and Comparative Genomics
<p><em>Hox</em> genes encode master regulators of body plan during embryonic development. In land and avian (bird) vertebrates there are four clusters of <em>Hox</em> genes (A, B, C, D). Patterns of <em>Hox</em> expression (paralogs 5-8), in our work specifically <em>Hoxc5, c6, c8,</em> and …
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Eocrinoidní ostnokožci ze středního kambria barrandienské oblasti
… described from the Jince Formation - its unique body plan highlights evolution of the body wall among blastozoans. Palaeoecology and phylogeny of the genus Vyscystis was studied, and phylogenetic analysis suggests a basal position of lepidocystoids among...
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Gene Expression in the Choanoderm
<p>The body plan of sponges (phylum Porifera) is an outlier among modern animals and is thought to have special evolutionary significance. Sponges lack muscles, nerves and a gut. Instead, they are composed of few cell types and simple tissues that function to pump water through an internal canal …
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WNT signalling in the patterning of human gastruloids
… critical period, the fundamental aspects of the body plan are established through a process known as gastrulation, which begins 14 days post fertilisation. Because of the 14-day rule imposed on human embryo research, no experimental studies have been conducted beyond this date. The derivation of …
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The evolution of modular artificial neural networks.
… The algorithm starts with a simple robotic body plan. This then grows incrementally in complexity along with its controlling neural network and the environment it reacts with. The network grows by adding modules to its structure - so the technique may also be termed a Growth Algorithm. …
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Geometry and transport in development
… collectively migrate to lay out the organism's body plan. Here, a direct physical modeling approach is hampered by the exploding complexity of a three-dimensional many-body dynamic which obfuscates the identification of relevant degrees of freedom. In this context, we investigate ways to …
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Analysis of the Zebrafish Segmentation Clock
… are the clearest indicators of the segmented body plan. The embryonic precursors of the vertebral column and skeletal musculature are bilaterally symmetric blocks of tissue flanking the notochord called somites. Somites are generated sequentially and periodically from an unsegmented tissue …
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Gut Patterning In Development And Evolution: A Comparative Differential Transcriptomics Approach
… (GRN) essential for the development of the body plan. Modifications within the elements of the GRN determine the evolution of animal forms. In this study, the GRN for embryonic gut specification in two echinoderm species, the sea urchin Strongylocentrotus purpuratus and the sea star Patiria …
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The Allometry of Giant Flightless Birds
… than mammals when the constraints of a flying body plan are taken into account. Nevertheless, the largest mammals are ten times the mass of the largest birds. Allometric equations generated for anseriforms and ratites suggest mid-shaft femur circumference is the best measure to use in …
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