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Showing 1 to 20 of 28 for “"23Na"”.
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23Na/51 V-NMR study of (Alpha)´- NaV2O5
In this work I present a 23Na/51V-NMR study of sodium vanadate as pure compound, and the influence of very small amounts of Sodium substitution by Calcium and Lithium is reported and discussed. The measurements of spin-lattice relaxation for 23Na and 51V are also presented. The sodium vanadate is …
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23Na-Magnetresonanzspektroskopie-Untersuchungen zum Verlauf der Narbenentwicklung nach Myokardinfarkt
… postoperativ entnommen und der Na-Gehalt mittels 23Na-MRS und Ionenchromatographie bestimmt. Der Na-Gehalt nach MI war zu allen Zeitpunkten bei beiden Bestimmungsmethoden auf Werte zwischen 306 und 160% des Kontrollwertes erhöht (n= 6-8) je Gruppe, p<0.01 vs. Kontrolle). Der Na-Gehalt ist im …
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Investigation of sodium binding through implementation and application of single- and double-quantum filtered 23Na NMR spectroscopy
… to saltiness perception would be of great value. 23Na NMR spectroscopy is such a method, since it offers a unique means for non-invasively measuring both sodium content and mobility using recently developed single-quantum (SQ) and double-quantum filtered (DQF) NMR experiments. In food products, …
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Noninvasive Monitoring of CCl4 Induced Acute and Chronic Liver Damage in Rat by Single Quantum and Triple Quantum Filtered 23Na Magnetic Resonance Imaging
… quantum (SQ) and triple quantum filtered (TQF) 23Na magnetic resonance imaging (MRI) was used to monitor the severity and progression of CCl4 induced acute and chronic liver damage in rat model. SQ 23Na MRI was proposed to measure the 23Na signal intensity (SI) of total tissue sodium ions, and …
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Tissue Sodium in CKD Patients
… (CKD) due to long term loading, and sodium (23Na) can be deposited in the skin, muscle and skeleton. We measured 23Na content in these tissues of CKD patients, using 23Na magnetic resonance (MR) imaging. Methods: This is a pilot cross-sectional study of CKD stage 4-5D patients and healthy …
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Development and Optimisation of Radial Techniques for Sodium Magnetic Resonance Imaging
… work was to provide techniques and hardware for 23Na MRI of the human brain, heart and muscle in a clinical scanner at 1.5T. For this purpose, radiofrequency (RF) coils were developed and a transmit/receive switch was adapted to 16.84 MHz. A 3D radial gradient echo (GRE) sequence was implemented, …
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Experiments with interacting Bose and Fermi gases
… produced by sympathetic cooling with bosonic 23Na. For this, an existing 23Na Bose-Einstein condensation apparatus was upgraded to an experiment capable of producing degenerate 6Li Fermi gases and 6Li-23Na degenerate Fermi-Bose mixtures. The cooling methods have been developed in two different …
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Strongly interacting quantum mixtures of ultracold atoms
… 40K -41K. Secondly, a new Bose-Fermi mixture of 23Na -40K is introduced. We show that 23Na is a very efficient coolant for 40K by sympathetically cooling 40K to quantum degeneracy with the help of a 23Na condensate. Moreover, over thirty interspecies Feshbach resonances are identified, paving the …
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Multi-Nuclear NMR Studies of Phospholipid Membranes and their Interaction with Membrane Active Substances
… of the anaesthetics within the bilayer.<br/><br/>23Na + and 7Li transport across large vesicles was monitored using 23Na+ and 7Li+-NMR. The effect of the general anaesthetics on ion transport was found to be dependent upon the ionophore and the type of metal ions present in the vesicular solution, …
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Nuclear magnetic resonance study of promoted catalysis
… samples con t a1. n1. ng 23N a. By 'performing a 23Na- 13C double resonance with adsorbed CO, we determined that at least 22% of the Na in the samples is on the Pt. The 23Na line shows no indication of a Knight shift and the Na spin-lattice relaxation varies as 1/T2 , suggesting that the Na …
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Spin-orbit coupling and supersolidity in ultracold quantum gases
… one-dimensional spin-orbit coupling in ultracold 23Na gases and the creation of a new form of matter with supersolid properties using interacting spin-orbit coupled Bose-Einstein condensates. The first part describes the realization of spin-orbit coupling in optical superlattices which consist of …
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Dichte-gewichtete Phasenkodierung zur effizienten k-Raumabtastung in der NMR-Bildgebung
… hatten, konnten unterdrückt werden. In der 23Na-NMR-Bildgebung am Herzen wurde das DW Abtastschema eingesetzt, um die Verbesserung der Lokalisationsqualität durch Akquisitions-Wichtung erstmals auch in der 23Na-NMR-Bildgebung am menschlichen Herzen zu nutzen. Es konnte gezeigt werden, daß …
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Paramagnetic resonance studies of trivalent dysprosium and cerium in the cubic host dicesium sodium yttrium hexachloride
… with resolved structure were seen from 133Cs and 23Na. resonance showed isotropic structure arising from a Fermi contact hyper- fine interaction. A multi-line anisotropic structure was seen in the 23Na ENDOR spectrum, with splittings several times as large as that expected for a purely point …
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Effects of interaction in Bose-Einstein condensates
… were first excited in a BEC of 3 x 107 condensed 23Na atoms via small-angle two-photon Bragg scattering. Large angle Bragg scattering was then used to probe the momentum distribution. We found reasonable agreement with the theory. With the same technique of Bragg diffraction, we studied the …
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Novel approaches to MRI of glioma
… sodium homeostasis. Non-invasive detection of 23Na with MRI has the potential to quantify sodium concentration and therefore could be an imaging probe of cell morphology and membrane function within the tumour microenvironment, as well as a method of probing tissue heterogeneity. During my PhD, …
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An Anion Selective Aminocyclodextrin Ion Channel: Ion Selectivity, pH Sensitivity and Potential as a Scaffold for Light Gating
… Ion transport through the channel gauged using 23Na NMR and fluorescence spectroscopy indicated high ion transport activity, comparable to natural ion channels. The fluorescence studies also indicated that the ion channel was highly anion selective with anion transport rates being ClO4- > I- > …
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Dimers, Trimers and their Superpositions in a Bose-Fermi Mixture
… states in a Bose-Fermi mixture of ultracold 23Na and 40K atoms. We examine the formation of dimers and trimers in a balanced, thermal mixture and their evolution into strongly interacting Bose polarons with hybridized dimer and trimer character when we instead immerse an impurity …
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Multinuclear Solid-State Nuclear Magnetic Resonance Spectroscopy of Microporous Materials
… comprehensive study of titanosilicates by 29Si, 23Na, 39K, and 47/49Ti SSNMR was also performed. This work is highlighted by the acquisition of natural abundance SSNMR spectra for three unreceptive quadrupolar nuclei, 47/49Ti and 39K, at 21.1 T. 47/49Ti SSNMR provides insights into the …
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Quantum reflection of Bose-Einstein Condensates
… surface at normal incidence. Using atoms from a 23Na BEC, cooled to a few nanokelvin in a recently demonstrated single-coil trap, controlled collisions were induced between atoms and solid silicon surface. A maximum reflection probability of - 12% was observed for an incident velocity of 1 mm/s. …
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