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 845 for “"polarity"”.
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Focus, polarity and framing effects
… likelihood of a situation is in turn related to polarity and frequency which is found to be connected to markedness. The thesis as a whole suggests that reader's inferences are affected by their pragmatic knowledge of situations. This is discussed in more detailed with respect to pronominal …
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Neg-raising : polarity and presupposition
In this thesis, I advance a semantic theory of Neg-Raising rooted in the work of Bartsch (1973) and Heim (2000) and defend it against syntactic and pragmatic alternatives. The primary source of support for my position on Neg-Raising comes from the natural way in which the approach explains a …
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The grammar of negative polarity
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Linguistics and Philosophy, 1980.
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Cell polarity under extreme morphological conditions
Cell polarity is an important phenomenon in a multitude of cellular and developmental processes. The cellular contexts that polarity occurs in include a wide array of morphological properties such as size, shape, and growth. An important, conserved system of cell polarity depends on the …
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Regulation of Neuronal Polarity by Wnt Signaling
… act redundantly to regulate the anteroposterior polarity of mechanosensory neurons ALM and PLM in C. elegans (Hilliard and Bargmann, 2006; Prasad and Clark, 2006). With the exception of one wnt/fz pair (lin-44/lin-17) the specific interactions between Wnt ligands and cell surface receptors in …
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Expansion and contraction: Goethean polarity and architecture
… understanding of his works using his ideas on polarity as the core principle. Polarity stems from Goethe’s early involvement in botany where he describes the development of annual plants through cycles of expansion and contraction as opposite sexual forces of natural productivity. This …
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The three-state-polarity-coincidence correlation detector
The three-state-polarity-coincidence correlator (PCC'), a two-input detection device with dead zone clippers, has been investigated in detail. A criterion is devised to compare two detectors. Comparisons are made between the PCC' and several other types of detectors. The superiority of the PCC' in …
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Polarity Inversion in Silicon and Phosphorus Compounds
… silicon and phosphorus compounds of inverse polarity with respect to conventional reactivity by accessing oxidation states that are atypical for these p-block elements. This umpolung approach affords novel reactivity that was previously unavailable to silicon and phosphorus molecules. In a …
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Postembryonic Polarity Modification in the Acoel Convolutriloba longifissura
… 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 <em>Convolutriloba longifissura</em> is unusual in its ability to …
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Reversal of Polarity In Some Woody Dicotyledonous Angiosperms
<p>There has for some time existed a theory regarding organized or possibly unorganized formative substances which flow in different directions in the plant tissue and give to the supposedly polarized meristematic tissues of the plant the power to develop to maintain roots from one given or …
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Molecular signaling programs underlying neutrophil polarity and chemotaxis
… the development and maintenance of neutrophil polarity. By using neutrophil-like HL-60 cells, we describe a pivotal role for Rictor, a component of Mammalian Target of Rapamycin Complex 2 (mTORC2), in regulating assembly of the actin cytoskeleton during neutrophil chemotaxis. Depletion of …
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Polarity governs atomic interaction through two-dimensional materials
Transparency of two-dimensional (2D) materials to inter-molecular interactions has been an unresolved problem. Previous researchers found that water droplets interact with underlying substrates through graphene, as if the graphene is "transparent". However, graphene's transparency determined by …
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Cell Polarity Regulates Organ Growth Through The Hippo Pathway
<p>Defects in apical-basal cell polarity and abnormal expression of cell polarity determinants are linked to human cancer. Loss of polarity is highly correlated with malignancy. In <em>Drosophila</em>, perturbation of apical-basal polarity, including overexpressing the apical determinant Crumbs, …
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Lipid rafts in protein sorting and yeast cell polarity
… the TGN and their exploitation for cell surface polarity in the yeast Saccharomyces cerevisiae. To this end, we conducted a genome wide screen that identified yeast mutants defective in cell surface delivery of the model cargo protein FusMid-GFP. The most striking result of this screen was that …
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The Role of Tissue Cell Polarity in Monocot Development
… through directly influencing tissue cell polarity (if axiality is defined by a polarity based axiality system), with differential effects on shape depending on where it is expressed. This suggests that novel developmental switches in shape could evolve due to single gene mutations, and …
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Cell Polarity Establishment in the Budding Yeast Saccharomyces Cerevisiae
<p>Establishing an axis of cell polarity is central to cell motility, tissue morphogenesis, and cell proliferation. A highly conserved group of polarity regulators is responsible for organizing a wide variety of polarized morphologies. One of the most widely expressed polarity regulators is the …
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Autoregulation of the Glial Gene reversed polarity in Drosophila melanogaster
… on many target genes, one of which is reversed polarity (repo). repo is necessary for proper glial cell differentiation; once activated, its expression is maintained throughout the life of the fly through currently unknown mechanisms. I propose that repo expression is maintained in an …
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Polarity and secretion of Shigella flexneri IcsA: a classical autotransporter
… the molecular mechanisms that generate IcsA polarity remain poorly understood. Furthermore, IcsA is a member of the autotransporter family of secreted virulence factors (Type Va). Although many steps in the autotransporter pathway have been elucidated, it is still poorly understood how these …
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An experimental investigation of electrical discharge machining using reverse polarity
Thesis (M.S.)--Massachusetts Institute of Technology. Dept. of Mechanical Engineering, 1967.
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Chromatin regulators and the determination of embryonic polarity in Drosphila
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 1994.
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