Study of gas-fluidization dynamics with laser-polarized 129Xe
نویسندگان
چکیده
منابع مشابه
Study of gas-fluidization dynamics with laser-polarized 129Xe.
We report initial NMR studies of gas dynamics in a particle bed fluidized by laser-polarized xenon (129Xe) gas. We have made preliminary measurements of two important characteristics: gas exchange between the bubble and emulsion phases and the gas velocity distribution in the bed. We used T2* contrast to differentiate the bubble and emulsion phases by choosing solid particles with large magneti...
متن کاملGas flow MRI using circulating laser-polarized 129Xe.
We describe an experimental approach that combines multidimensional NMR experiments with a steadily renewed source of laser-polarized 129Xe. Using a continuous flow system to circulate the gas mixture, gas phase NMR signals of laser-polarized 129Xe can be observed with an enhancement of three to four orders of magnitude compared to the equilibrium 129Xe NMR signal. Due to the fact that the gas ...
متن کاملApplications of laser-polarized 129Xe to biomolecular assays.
The chemical shift sensitivity and significant signal enhancement afforded by laser-polarized 129Xe have motivated the application of 129Xe NMR to biological imaging and spectroscopy. Recent research done by our group has used laser-polarized 129Xe in biomolecular assays that detect ligand-binding events and distinguish protein conformations. The successful application of unfunctionalized and f...
متن کاملStudy of Gas Flow Dynamics in Porous and Granular Media with Laser - Polarized 129 Xe NMR
This thesis presents Nuclear Magnetic Resonance (NMR) studies of gas flow dynamics in porous and granular media by using laser-polarized 129Xe. Two different physical processes, the gas transport in porous rock cores and the mass exchanges between different phases in fluidized granular systems, were investigated and new experimental methods were designed to measure several important parameters ...
متن کاملDistinguishing multiple chemotaxis Y protein conformations with laser-polarized 129Xe NMR.
The chemical shift of the (129)Xe NMR signal has been shown to be extremely sensitive to the local environment around the atom and has been used to follow processes such as ligand binding by bacterial periplasmic binding proteins. Here we show that the (129)Xe shift can sense more subtle changes: magnesium binding, BeF(3)(-) activation, and peptide binding by the Escherichia coli chemotaxis Y p...
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ژورنال
عنوان ژورنال: Magnetic Resonance Imaging
سال: 2005
ISSN: 0730-725X
DOI: 10.1016/j.mri.2004.11.012