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"Diffusion-diffraction" experiments on water, yielding "q-space" plots, were conducted on suspensions of oxygenated (diamagnetic) human erythrocytes. (i) These suspensions displayed diffusion-diffraction of water; (ii) the shape of the q-space plots depended on the direction along which the diffusion was measured, thus implying alignment of the cells in the(More)
We demonstrate the first two-dimensional correlation NMR (COSY) spectra obtained at ultra low frequencies (ULF) using the Earth's magnetic field. Using a specially developed spectrometer with multiple audio-frequency pulses under controlled pulse phase, we observe magnetisation transfer arising from heteronuclear J-couplings in trifluoroethanol and(More)
The Earth's magnetic field, though weak, is appealing for NMR applications because it is highly homogeneous, globally available and free. However, the practicality of Earth's field NMR (EFNMR) has long been limited by the need to perform experiments in outdoor locations where the local field homogeneity is not disrupted by ferrous or magnetic objects and(More)
The 1 H nuclear magnetic resonance (NMR) spin-lattice relaxation rate of hydrated sands is related to the surface to volume ratio of the voids or pores between the hydrated sand grains and the surface relaxivity of the grains. The electron spin resonance (ESR) signal is often used to predict the relative surface relaxivity as the surface relaxivity is(More)
Motivation Over the past 50 years, many ENC attendees have taken relaxing walks on the sandy beaches of the Asilomar to contemplate NMR spins. Why are these sandy beaches so relaxing and conducive to contemplating spins? Could it be related to the 1 H NMR spin-lattice relaxation rate (R 1) of the hydrated sands themselves? As a first step towards testing(More)
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