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 39 for “"Branch Point"”.
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Identification of branch-point restrictions in microbial metabolism through metabolic flux analysis and local network perturbations
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1991.
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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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Two cylindrical vortex sheets : evolution and singularity formation
Using Rosenhead's point-vortex approximation with correction terms, the evolution of two symmetrical, counter-rotating, initially cylindrical vortex sheets in an incompressible, potential fluid flow is studied. Simulations are performed in time up to the occurrence of branch-point curvature …
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Rearrangements and biogenetic relationships of silphinane sesquiterpenes
… could be an important intermediate and a branch point in the biogenesis of triquinane sesquiterpenes such as silphiperfol-6-ene, silphinene, and related compounds.
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Thermodynamic characterization of DNA Triple-Helical three-way junctions
… differ primary in the arrangement of the branch point and the ends of the arms. In the case of the HG triple-helical three-way junction, the three 33-mer oligonucleotides can fold into hairpin structures, linked by a four membered cytosine loop. Each of the hairpins contain a …
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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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Bifurcation Analysis of Endogenous Growth Models
… the existence of Andronov-Hopf bifurcation, branch point bifurcation, limit point cycle bifurcation, and period doubling bifurcations. While these all are local bifurcations, the presence of global bifurcation is confirmed as well. We find evidence that the model could produce chaotic …
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Structural studies of spliceosome assembly and catalysis
… structure of the spliceosome immediately after branching shows how the 5′ splice site is ligated to the branch point adenosine upstream of the 3′ splice site. It reveals the three-dimensional conformation of the RNA-based active site, its stabilisation by tertiary interactions and an extensive …
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Discovery and characterization of stable introns in yeast
… their collective fate post-splicing is to be de-branched and rapidly degraded. This dissertation details the first described instance of a regulated fate and function for excised and de-branched introns in eukaryotes. We observed a set of introns in the budding yeast Saccharomyces cerevisiae's …
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Non-Smooth Dynamics and Control of Tapping Mode Atomic Force Microscopy
… of a solution trajectory as well as a solution branch with the discontinuity surface is also presented. Analytical conditions are formulated to locate the co-dimension two grazing point and discontinuity-mapping technique is used to obtain a normal form description of the near-grazing dynamics. …
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SOURCES AND STRUCTURES OF COMMONLY OCCURRING HIGHLY BRANCHED ISOPRENOID ALKENES
Highly branched isoprenoid (HBI) alkenes are ubiquitous lipids which have been identified in numerous geochemical samples, ranging from recent sediments to ancient oils. At the outset of the current investigation, the diatomaceous algae Haslea ostrearia (C25 alkenes) and Rhizosolenia setigera (C25 …
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The necessity of debranching in starch biosynthesis
… formation of an a-1,6 linkage to introduce a branch point. Recently, a fourth step has been proposed in starch granule biosynthesis (Ball et al., 1996). This step involves the hydrolysis of a-1,6 linkages by the action of a debranching enzyme. Our study provides further evidence for the …
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Crystallization behavior and structure property behavior of selected thermoplastic polymers
… morphological features, equilibrium melting point, and abso1ute crystalline percentage of linear and starbranched nylon-6 have been studied as a function of branch-point functionality and crystallization temperature. Overall bulk crystallization rates were described in terms of the Avrami …
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The Role of Potassium in Betaine-Homocysteine Methyltransferase
… of methionine metabolism and acts as a critical branch point between protein synthesis and numerous regulatory pathways in the cell. Elevated plasma total Hcy (tHcy) is associated with an increased risk for cardiovascular disease, although the mechanism by which this occurs remains unclear. Two …
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Simulations of a three degree of freedom brachiating Y-bot robot
… in the simulations was to swing from a one "branch" point to another. The trajectories of two Y-bot models swinging from rest were optimized. Furthermore, the gait of one of the models was examined, and a beneficial state for the second swing of a gait was suggested. A method to optimizing …
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A general scaffold for the synthesis of cysiherbaine and its analogues
… for its use. The molecule will serve as the branch point for the synthesis of other analogues. We designed a 12 step route to this molecule that utilizes highly stereo- and regioselective reactions. The molecule 4 will provide dysiherbaine and a series of analogues without having to design a …
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The Study of Aa3-Type Cytochrome C Oxidase in Rhodobacter Sphaeroides
… mutations caused changes in the pKa of E286 (branch point for substrate proton and pumped proton), which led to the conclusion that the pKa of E286 is not directly related to proton pumping ability.
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The study of aa3-type cytochrome c oxidase in Rhodobacter sphaeroides
… mutations caused changes in the pKa of E286 (branch point for substrate proton and pumped proton), which led to the conclusion that the pKa of E286 is not directly related to proton pumping ability.
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Three genes from Solanum chacoense coding for squalene synthase
… synthase (EC 2.5.1.2.1; SQS) is located at a branch point in the isoprenoid pathway and catalyzes the condensation of two molecules of farnesyl diphosphate to form squalene. SQS activity contributes to the formation of triterpenes and sterols, including phytosterols, brassinosteroids, …
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Evolutionary conservation and characterization of the metazoan amino acid response
… (ISR) in mammals. The ISR consists of multiple branches, each one triggered by distinct stresses that produce phospho-eIF2α signal generation. Each ISR initiating stress results in a unique cellular response due to activation of both the ISR and additional parallel pathway(s) by the initiating …
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