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caltechETD 檢索結果共 5156 筆,本頁資料從第 145 筆到第 156 筆

The cellular cytoplasmic space contains many different molecules and complexes confined within a small volume. Understanding how objects are transported in this crowded space is important for many potential applications. In this work, we examined various aspects of cytoskeletal mechanics, including microtubule-mediated and diffusive transport using advanced fluorescence....

By Rajan P. Kulkarni--California Institute of Technology--2006-01-18
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The past decade has witnessed a drastic change in the design of high-speed serial links. While Silicon fabrication technology has produced smaller, faster transistors, transmission line interconnects between chips and through backplanes have not substantially improved and have a practical bandwidth of around 3GHz. As serial link speeds increase, new techniques must be i....

By James Franklin Buckwalter--California Institute of Technology--2006-01-17
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Genetically engineered artificial proteins are promising candidates for new biomaterials because their amino acid sequences can be precisely controlled. This work describes the characterization of crosslinked films of biomimetic artificial extracellular matrix (aECM) proteins with hybrid functions designed to meet materials needs in applications such as small diameter v....

By Paul John Nowatzki--California Institute of Technology--2006-01-10
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Odors evoke complex sequences of activity in antennal lobe projection neurons (PNs), the insect analogs of mitral/tufted cells. These PN activity patterns evolve over hundreds of milliseconds, are consistent across trials, and contain information about odor identity and concentration. However, in natural settings animals must often identify odor blends or multiple odora....

By Bede Michael Broome--California Institute of Technology--2006-01-06
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During cleavage stages Spblimp1/krox is expressed in the large micromeres and veg2 descendents. During later blastula stages, it is expressed in the endoderm precursors of the veg1 ring of cells distal to the vegetal pole of the blastula. Later, its expression is restricted to the blastopore region and the posterior of the invaginating archenteron, and finally to the mi....

By Carolina Becker Livi-Biology-California Institute of Technology-doctoral-2005-12-21
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The performance of a coherent free-space optical communications system operating in the presence of turbulence is investigated. Maximum Likelihood Detection techniques are employed to optimally detect Pulse Position Modulated signals with a focal-plane detector array and to reconstruct the turbulence-degraded signals. Laboratory equipment and experimental setup used to ....

By Michela Munoz Fernandez--California Institute of Technology--2005-12-19
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Discrete solid-state high-power amplifiers are among the important circuit components in todayâs wireless communications and remote-sensing applications. As the device technologies continue to improve, there are new opportunities and new challenges presented to power amplifier designers. This thesis presents novel techniques in the design and the analysis of L-band hig....

By Feiyu Wang--California Institute of Technology--2005-12-19
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LuxR-type proteins are responsible for density-dependent transcriptional regulation in quorum-sensing systems that employ acyl-homoserine lactones (acyl-HSLs) as signal molecules. The Vibrio fischeri lux operon, which includes LuxR, has been well studied and shown to function in E. coli. The components of the lux operon have been used to engineer de novo genetic circuit....

By Cynthia Hollie Collins--California Institute of Technology--2005-12-19
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We generated records of radiocarbon and trace metals in deep-sea corals to investigate the role of the deep ocean during episodes of rapid environmental change. Our record of radiocarbon ages measured in a modern deep-sea coral from the northeastern Atlantic shows the transfer of bomb radiocarbon from the atmosphere to the deep ocean. We detect bomb radiocarbon at the c....

By Selene Farrell Eltgroth--California Institute of Technology--2005-12-16
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Low interfacial electron-hole recombination rates are essential for low-noise electronic devices and high-efficiency solar energy converters. This recombination rate is dependent on both the surface electrical trap state density, NT,s, and the surface concentrations of electrons, ns, and holes, ps. A reduction in NT,s is often accomplished through surface chemistry, and....

By David Jason Michalak--California Institute of Technology--2005-12-15
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This thesis reports experimental and theoretical studies of the spectroscopy and kinetics of four atmospheric reservoir species: peroxynitrous acid (HOONO), peroxyacetyl nitrate (PAN, CH3C(O)OONO2), methyl hydroperoxide (MHP, CH3OOH), and hydroxymethyl hydroperoxide (HMHP, HOCH2OOH). Reservoir species are so named because they temporarily or permanently sequester reacti....

By Juliane Loraine Fry--California Institute of Technology--2005-12-15
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We carry out certain automorphic and l-adic computations, the former extending results of Beilinson and Scholl, and the latter using ideas of Kato and Kings, related to explicit motivic cohomology classes on modular varieties. Under mild local and global conditions on a modular form, these give exactly the coordinates of the Deligne and l-adic realizations of said motiv....

By Matthew Thomas Gealy--California Institute of Technology--2005-12-08
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