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 127 for “"cell shape"”.
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Mechanisms controlling cell shape patterning in petals
… patterns created by the combination of different cell shapes have also been observed. However, why and how plants create these structural patterns remains largely unknown. My PhD project aims to investigate the development of petal structural patterns and explore their possible ecological …
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Petal cell shape and flower-pollinator interaction in Nicotiana
Petal epidermal cell shape has been shown to affect pollination success in flowering plants. Conical epidermal cells may increase grip for insect pollinators and enhance flower colouration compared to non-conical cells. Nicotiana (Solanaceae) presents a diverse range of petal cell shapes. …
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The empirical analysis of the red blood cell shape.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1972. B.S.
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From Cell Shape to Body Shape: Epithelial Morphogenesis in Drosophila melanogaster
… of the Actin cytoskeleton of individual cells. In many instances, conserved Rho-family GTPases that are activated by Rho guanine nucleotide exchange factors (RhoGEFs) play an important role in this process. The present thesis investigates the mechanisms that control activation and …
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Cell shape & integrins : determinants of extracellular matrix regulation of growth & survival
Thesis (Ph. D.)--Massachusetts Institute of Technology, Whitaker College of Health Sciences and Technology, 1997.
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The Influence of Membrane Lipid Order on Cell Shape and Microvesiculation in Human Erythrocytes
Exposure of human erythrocytes to elevated intracellular calcium causes alterations in cell shape and stimulates shedding of the cell membrane in the form of microvesicles. We hypothesized that both the shape transition and microvesiculation are influenced by microscopic membrane physical …
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The Roles of EGFR and FGFR2 in Cell Shape Maintenance of Human Lung Tip Progenitor Epithelial Cells
The Roles of EGFR and FGFR2 in Cell Shape Maintenance of Human Lung Tip Progenitor Epithelial Cells Recent work in the developing human lung has identified distal tip epithelial progenitors that are SOX9+SOX2+ and give rise to all lung epithelial cell types (Danopoulos et al., 2019b; Miller et al., …
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THE FEEDBACK BETWEEN CELL SHAPE AND CYTOSKELETAL DYNAMICS ON CELL DIVISION AND EXPANSION IN EPIDERMAL PAVEMENT CELLS OF ARABIDOPSIS
… of lobes in the anticlinal walls of pavement cells, though curvature is also noted in the periclinal walls. The epidermal pavement cells form unique lobed shapes over time, while stomata, composed of guard cells, are identical in size and shape. Both cell types emerge from the same precursor …
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Characterization of the zebrafish zipper interacting protein kinase homolog
<p>The regulation and maintenance of normal cell movements and shape play a vital role in the normal development and health of every living thing. The characterization of 6 zebrafish Zipper Interacting Protein Kinase homolog has helped to better understand how changes in cell cytoskeletal elements …
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Centrosome-organized plasma membrane infoldings linked to growth of a cortical actin domain
Regulated cell shape change requires the induction of cortical cytoskeletal domains. Actin is a cytoskeleton protein that makes up the cortex and drives cell shape change. Signals to induce actin polymerization can come from external or internal cues. Often, local changes to plasma membrane (PM) …
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Genetic Analysis Of Rhoa Signaling During Epithelial Morphogenesis In Drosophila
Epithelial morphogenesis is contingent upon cell shape changes. Cell shape changes are the driving force for the metamorphosis of the adult Drosophila leg from the leg imaginal disc precursor. Genetic analysis has identified several Drosophila genes involved in regulating cell shape changes during …
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The spatial organization of the microtubule cytoskeleton and cell divisions promotes tissue morphogenesis
… tissues grow and become sculpted into complex shapes through highly coordinated cell behaviors, such as cell shape change and cell division. Both processes involve contractile forces generated from distinctly organized actomyosin networks. How cells coordinate their behaviors and how different …
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Traps, Tensions and Transmissions: The Unionisation of Resistance Movements against External Destabilising Forces; Design, Development and Deployment of Holographic System for Active Surveillance and Targeted Manipulation
… of this hybrid system to the study of cell shape regulation and the role of effective membrane tension in unionising actomyosin movement to resist external deformational and destabilising forces. We demonstrate that simultaneously trapping and unfolding the cell membrane, quantitatively …
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Zebrafish Posterior Lateral Line Organogenesis Regulation by Notch Signaling
… depends on the precise orchestration of cell migration, cell fate specification and cell shape chages. Results in this thesis demonstrate that Notch signaling is an integral part of the feedback loop between Wnt and Fgf signaling that underlies the self‐organization of rosette‐shaped …
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The streptomyces cytoskeletal protein (Scy) is a key component of the tip organising centre for polarized growth in streptomyces coelicolor
… of multigenomic hyphae that then form unicellular spores. Bacterial cell shape determination has been influenced heavily by the discovery that bacteria have a number of eukaryotic cytoskeletal homologues as well as a number of accessory proteins unique to prokaryotes. As cell shape …
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Exploring the diversity of epidermal pavement cell shapes
Pavement cells in the leaf epidermis can exhibit a wide variety of shapes. Undulations in the anticlinal cell wall are a particularly interesting feature present in many model species: for example, Arabidopsis thaliana, tobacco and maize; but absent in others, like Brachypodium distachyon. …
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Mechanisms of myosin regulation and function during tissue folding
… forms are generated by coordinated cell shape changes that induce global tissue shape changes, such as the transformation of an epithelial sheet into a tube. A model for this transformation occurs early in Drosophila development where approximately 1,000 cells on the ventral side of …
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Bioimage informatics for understanding the effects of chemotherapy on cellular signaling, structure, and function
… the structural and functional changes in cancer cells associated with these features of disease progression remain poorly understood. Consequently, quantitative characterization of molecular signaling pathways and changes in cancer cell phenotypes induced by chemotherapy through the use of in …
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Geometrical Models for 2D Morphometry in Bioimages
From understanding how cell shape can be a biomarker in cancer diagnosis and prognosis to how change in cell shape dictates embryogenesis, morphology quantification is crucial in different areas of biology. Morphology-related measurements are extracted from segmented objects in bioimages, and their …
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Cellular patterns during leaf development
… is to understand how the behaviour of individual cells creates reproducible biological shapes. Moreover, the reproducibility of form also happens at the cellular level and cellular patterns are evident in the temporal as well as the spatial scales. Understanding the principles underlying these …
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