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 51 for “"Positional information"”.
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Positional Information in Adult Bilaterian Tissues
… These challenging biological processes require positional information, which influences spatial fate and migration decisions to generate proper tissue formation. In this work, we investigated the mechanisms of positional information across the animal kingdom through the study of different …
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Understanding Positional Information During Zebrafish Fin Regeneration
… which this patterning happens is referred to as positional memory. Identification of factors responsible for positional memory in vertebrate appendage regeneration has remained elusive. This dissertation establishes zebrafish pectoral fins as a model system for studying and defining positional …
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Influence of gene expression gradients on positional information content in fly embryos
The concept of positional information was introduced to qualitatively explain how individual cells are involved in forming patterns. Recent experimental and theoretical developments have made studying specific biological systems in a quantitative manner possible using the framework of positional …
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A statistical model relating transcription factor concentrations to positional information in the early Drosophila embryo
The idea of morphogen gradients encoding positional information for a developing organism has long been discussed in the field of developmental biology, but only recently have quantitative models been proposed that relate measured transcription factor concentrations to enhancer activity. However, …
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Establishing a positional information assay for brain ventricle mutants and investigating the choroid plexuses in zebrafish
… studies, we established an assay to analyze positional identity of cells in the neural tube and discovered a potential choroid plexus marker, shown its expression time course, and outlined its early expression pattern in the zebrafish.
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Pattern Formation During Extensive Cell Movements
… developing tissues have relied on the ideas of positional information and gradients of signalling across the developing tissue, which impart spatial coordinates to individual cells. These coordinates then inform the cell of its respective fate, and hence a pattern of gene expression with spatial …
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Polarity establishment and signalling mechanisms controlling patterning in Hibiscus Trionum petals
… an elaborate and robust pattern are unclear. Positional information is required for cells to be able to differentiate correctly along the proximo-distal (PD) axis of the petal, but the establishment of tissue polarity is also not well understood. Through my PhD work I have started to address …
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Organizer regeneration and patterning of stem cell lineages in planarians
… its formation, the anterior pole integrates positional information from the pre-existing tissues. This process places the anterior pole in the appropriate location to organize patterning during head regeneration. Regeneration in planarians involves two important components. Neoblasts are …
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The instructive roles of muscle cells in planarian regeneration
… requires both new cell production and patterning information to correctly place new tissue. Planarians are flatworms with remarkable capacity to regenerate after nearly any injury and to indefinitely maintain tissue homeostasis. Dividing cells, neoblasts, are the source of all new tissue, whereas …
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Enhancing the VANET Network Layer
… an IPv6 addressing strategy which embeds positional information within an IP address allowing for location based routing; and finally a novel position based routing protocol which has two primary advantages over existing protocols, firstly removing unnecessary overhead information and …
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Collaborative concurrent mapping and localization
… single vehicles, but do not account for extra positional information available when multiple vehicles operate simultaneously. Multiple vehicles have the potential to map an environment more quickly and robustly than a single vehicle. This thesis presents a collaborative CML algorithm that …
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Technical benefits and cultural barriers of networked Autonomous Undersea Vehicles
… the areas of reduced power consumption, improved positional information and improved acoustic communication bandwidth. However, current culture of AUV development may impede this approach. The thesis uses the Object Process Methodology (OPM) and principles of System Architecture to trace the value …
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The circuit basis of olfactory mate recognition and localisation
… in solving both tasks; they carry qualitative information to recognise, and positional information to locate a mate. How does the brain extract both a qualitative and a quantitative message from a single signal, like a pheromone smell? We used the pheromone sensing circuit of Drosophila …
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Through-wafer interrogation of MEMS device motion
… to access accurate, real-time microstructure positional information to determine if the device is performing as expected. Previously explored optical and electrical methods of MEMS device monitoring are often only suitable for research environments, or are unable to produce clear and …
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Signaling mechanisms and developmental function of fibroblast growth factor receptors in zebrafish
… secreted and signal over a long range to provide positional information in the target tissue (Scholpp and Brand 2004). Fgf ligands signal in a receptor-dependent manner via tyrosine kinase receptors, four of which have been so far identified. Fgf8 signaling was shown to depend both on receptor …
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Geometric methods for optimal resource allocation in wireless network localization
… an emerging paradigm for providing high-accuracy positional information in GPS-challenged environments. The localization performance of a node in WNL is determined by the allocation of transmit resources among its neighboring nodes. To achieve the best localization performance, we develop a …
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Towards location-awareness in next generation wireless networks : a new approach based on channel state information
… a novel approach to localization based on soft information (SI), exploiting all positional information inherent in measurement and contextual data, has been proposed. This thesis further develops SI-based localization by establishing a new approach relying on channel state information (CSI) …
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Heterogeneity-aware and energy-aware scheduling and routing in wireless sensor networks
… nodes for a timeslot is chosen based on their positional information. In the routing phase, a least cost route from a sensor to the sink is dynamically determined to prolong the lifetime of the sensor network.
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MtCEP1 peptides regulate lateral organ development in the model legume, Medicago truncatula
… regulates nodulation susceptibility and provides positional information for nodulation. In the sickle mutant, a mutant of the EIN2 (ETHYLENE INSENSITIVE 2) in the ethylene signaling pathway, hypernodulation and loss of positional information of the nodules could be observed. By utilizing the …
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MtCEP1 peptides regulate lateral organ development in the model legume, Medicago truncatula
… regulates nodulation susceptibility and provides positional information for nodulation. In the sickle mutant, a mutant of the EIN2 (ETHYLENE INSENSITIVE 2) in the ethylene signaling pathway, hypernodulation and loss of positional information of the nodules could be observed. By utilizing the …
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