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caltechETD 檢索結果共 5156 筆,本頁資料從第 205 筆到第 216 筆

Cortical cells in dissociated culture form densely interconnected networks. Within days after plating, neurons become electrically active, and soon after start to synchronize their activity into culture-wide bursts. By growing cultures on multi-electrode arrays (Petri dishes with a grid of substrate-embedded electrodes), their electrical activity can be recorded non-inv....

By Daniel A. Wagenaar--California Institute of Technology--2005-06-21
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Integrated liquid chromatography (LC) chips are valued because of their significant advantages over conventional systems. However, they are very challenging to build due to the high complexity of LC systems and the need for high-level integration of many discrete microfluidic devices. The goal of this thesis is to develop technologies and devices towards a totally integ....

By Qing He--California Institute of Technology--2005-06-21
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We test the matrix theory conjecture in the pp-wave by studying two-body interactions between gravitons and membranes. We compute the one-loop effective potential of matrix theory and compare it to the light cone Lagrangian of linearized supergravity. We have exact agreement in the absence of M-momentum transfer. We also find the effective potential that smoothly interp....

By Hok Kong Lee--California Institute of Technology--2005-06-20
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We present a measurement of the branching fractions of the exclusive radiative penguin processes B to K pi pi gamma in a sample of 232 million e+ e- to B Bbar decays recorded by the BaBar detector at the PEP-II asymmetric-energy storage ring. We reconstruct four final states: K+ pi- pi+, K+ pi- pi0, Ks pi+ pi-, and Ks pi+ pi0, where Ks to pi+ pi-, in the range m(K pi pi....

By Alexander Samuel--California Institute of Technology--2005-06-13
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An improved imidazolidinone catalyst for the LUMO-lowering activation of [alpha],[beta]-unsaturated aldehydes has been designed, synthesized and evaluated. This new catalyst allows hitherto infeasible reactions to proceed with high fidelity. A new strategy for the synthesis of C-3 chiral indoles has been developed. This strategy employs the use of the aforementioned imi....

By Joel Francis Austin--California Institute of Technology--2005-06-09
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The development of a catalyst capable of incorporating vinyl-functionalized polar olefins (methyl acrylate, acrylonitrile) into a linear polyethylene backbone is one of the most prominent challenges in organometallic chemistry. Recent developments in group 10 catalysts (Ni and Pd) have shown promise; however, there remains no system capable of this goal. Our group has d....

By Andrew Willis Waltman--California Institute of Technology--2005-06-09
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Large, high density FPGAs with high local distributed memory bandwidth surpass the peak floating-point performance of high-end, general-purpose processors. Microprocessors do not deliver near their peak floating-point performance on efficient algorithms that use the Sparse Matrix-Vector Multiply (SMVM) kernel. In fact, microprocessors rarely achieve 33% of their peak fl....

By Michael deLorimier--California Institute of Technology--2005-06-05
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Chemoattractant cytokines (chemokines) are small proteins that are known to play a key role in the development of numerous autoimmune and inflammatory diseases. The signal transduction cascade responsible for this pathology is initiated by chemokine binding to a G-protein coupled receptor (GPCR). Since therapeutic intervention would involve inhibition of ligand binding,....

By Shantanu Sharma--California Institute of Technology--2005-06-02
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The strategy and efficacy of applying computational tools to the development of new catalytic cycles is discussed using the enantioselective palladium-catalyzed aerobic oxidation of secondary alcohols as a model case. The key interactions responsible for the unique reactivity of ((â)-sparteine)PdX2 complexes (X = chloride, acetate) in kinetic resolutions of secondary a....

By Robert J. Nielsen--California Institute of Technology--2005-06-02
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One important part of the motivation for this research work comes from the microelectromechanical systems (MEMS) technology. Its basic concept of high volume production and low unit cost can only be achieved when the devices made by microelectronics technique are reliable. The success in this area largely depends on the understanding of materials. However, the mechanica....

By Rongjing Zhang--California Institute of Technology--2005-06-01
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Cytochromes P450 are of potential synthetic value because they hydroxylate a large array of substrates, often with high regio- and enantioselectivity. In contrast to most P450s, the BM-3 variant from Bacillus megaterium is soluble, easily expressed in E. coli, and does not require additional electron transfer proteins. A highly efficient enzyme for its preferred reactio....

By Peter Meinhold--California Institute of Technology--2005-05-31
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Small molecules that bind specific DNA sequences may have powerful therapeutic applications by influencing the mechanisms of abnormal gene expression. Polyamides containing N-methylimidazole (Im) and N-methylpyrrole (Py) specifically bind the minor groove of DNA and have been shown to inhibit many protein-DNA complexes. However, some major groove-binding proteins can co....

By Eric James Fechter--California Institute of Technology--2005-05-31
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