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 23 for “"Branch points."”.
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Identification of novel branch points reveals insights into RNA processing
… production of functional eukaryotic mRNAs. The branch point (BP) sequence is one of three key nucleotide sequences required for pre-mRNA splicing, however, in metazoa it has been less comprehensively studied than the 5' splice site (5'SS) and 3' splice site (3'SS) due to the relative difficulty …
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Whitham Equations, Dispersionless KP Theory and Seiberg-Witten Variables
… of the Whitham theory and formulas involving branch points of some Riemann Surfaces associated with the KdV equation. Briefly, a Riemann surface gives rise to integrable systems via the BA function. The averaging process gives modulation parameters Tn, ai and Whitham equations which describe …
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Controlling kinetic branching in C0₂-to-fuels catalysis
… requires knowledge and control over various branch points in the reaction pathway. In this work, we will present two specific branch points: (1) the requirements for selective activation of CO₂ over H+ to form the two-electron reduced CO product; and (2) the requirements for the accumulation …
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Existence and analyticity of many body scattering amplitudes at low energies
… continued in the energy, with square root branch points at the 2 cluster thresholds.
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Optimal mode localization in disordered, periodic structures
… we provide numerical evidence that complex branch points, which occur for complex disorder values in the mode-disorder relation, are responsible for modal sensitivity. We investigate the effects of the strength of the branch point and their location in the complex plane. In the third part of …
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On the Structure and Regularity of Stable Branched Minimal Hypersurfaces
… of stationary integral varifolds about their branch points. In addition to the hypotheses above, the only additional assumption we make is that the varifolds do not admit classical singularities of certain densities. More precisely, for any given $Q\in \{3/2,2,5/2,3,\dotsc\}$ we consider the …
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On the Melting and Crystallization of Linear Polyethylene, Poly(ethylene oxide) and Metallocene Linear Low-Density Polyethylene
… structure with lower concentration of branch points on the lamellar surface at lower undercooling, while shorter ethylene sequences form lamellar structures at higher undercooling exhibiting a higher concentration of branch points on the lamellar surface. Branch points limit the ability …
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Synthesis and Characterization of Multiphase, Highly Branched Polymers
… frequently cited as a key application for hyperbranched polymers. However, the high degree of branching in these polymers restricts entanglement and the resultant mechanical properties suffer. Longer distances between branch points may allow entanglements. Highly branched polymers, where linear …
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Molecular Modeling Studies of Dendrimers and Hyperbranched Polymers
… and rheological dynamics of dendrimers and hyperbranched polymers is investigated. Non-Equilibrium Brownian Dynamics (NEBD) simulations are utilized to investigate the single-molecule behavior in the dilute solution and the Tube Model is utilized to investigate the dynamics in the entangled …
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The accuracy of linear flux models in predicting reaction rate profiles in a model biochemical reaction system
… a set of hypothetical elemental reactions and branch points. The model pathway was used in this study to negate the affects of complex regulatory biochemical architectures which are not well described in literature. The use of the model pathway ensured that the reaction system was …
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Going With The Flow: Selective phosphodiesterase 4D7 (PDE4D7) regulation of vascular endothelial cell responses to fluid shear stress
… dyne/cm2), whereas in bifurcations, arches and branch points, VECs encounter low magnitude/oscillating or otherwise disturbed FSS (0-4 dyne/cm2). High laminar FSS promotes establishment of an adaptive VEC phenotype, characterized by the expression of anti-thrombotic, anti-inflammatory and anti- …
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In Vivo Studies of Yeast Mitochondrial Intron Splicing : Ectopic Branching and a Screen for Nuclear Encoded Splicing Factors
… several important determinants for in vitro branch-site selection of intron aI5gamma : the presence of a bulged A(A880), the 5' flanking GU base pair and the branch location within domain VI. I confirmed the in vitro findings in vivo and show that displacing the branch adenosine by one …
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Distant hemodynamic impact of local geometric alterations in the arterial tree
… effects in the arterial tree especially at branch points. Manipulation of one branch of a bifurcation might adversely affect the contralateral branch of the bifurcation. The goal of this work was to study the distant impact of local flow alterations, as well as to classify and evaluate the …
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Ordering of Curving Interfaces
… patterns, and anisotropic growth can form branching structures over many scales. The systems I study include fluid membranes and growing solids. My framework connects the study of liquid crystals to cytoskeletons of living cells, and provides tools for understanding the machinery of …
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A study of triorganotin biocides in antifouling coatings.
… formation of isocyanate oligomers which act as branch points for polymer cross-linking.Tri-n-butyltin chloride, to-(triphenyltin) oxide and triphenyltin chloride all catalyze the polyurethane reaction, the latter increasing the setting time rather than reducing it. Mossbauer and infrared …
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Regulation of Mammary Gland Development and Tumorigenesis By 14-3-3 Zeta
… mammary gland ductal elongation, and decreased branch points, terminal end buds, and proliferation compared to wildtype littermates. In mammary fat pad transplantation assays, 14-3-3z-knockout (14-3-3z-/-) mammary epithelial cells (MECs) had reduced ductal outgrowth and a competitive growth …
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The transcriptional regulation and health benefits of anthocyanin in Actinidia (kiwifruit) species
… it was shown that MYB5 and WRKY44 activated the branch points of the pathway responsible for the biosynthesis of cyanidin and delphinidin-based anthocyanins. Cell culture assays revealed that kiwifruit polyphenol extracts were able to reduce the activation of a key regulator in the inflammatory …
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Single molecule studies of branched polymer dynamics in non-dilute solutions
… their molecular architecture and microstructure. Branched polymers exhibit a multitude of distinct rheological phenomena, such as shear thinning and enhanced strain hardening, compared to linear polymers as a direct consequence of their complex, non-linear chain architecture. Owing to their unique …
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Hubbard trees and their properties.
A Hubbard tree is a set of points at the core of dendritic Julia sets. These trees encapsulate all the information about the larger Julia set, but in a much smaller, easier to understand structure. We discuss the structure of Hubbard trees, in particular, we provide a useful definition of branch …
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Synthesis and Characterization of Branched Macromolecules for High Performance Elastomers, Fibers, and Films
… A2 + B3 polymerization for the synthesis of hyperbranched polymers was altered using oligomeric precursors in place of either one or both of the monomer pairs to synthesize highly branched macromolecules. Unique topologies that are intermediates between long-chain branched and hyperbranched …
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