Abstracted/indexed

For the first time, a three-dimensional map of the distribution of water in a test sample has been obtained from the random radio signal (spin noise) emitted spontaneously by hydrogen nuclei in a magnetic field with varying field gradients. A special variant of a projection-reconstruction algorithm has been developed for noise data, which allows one to adjust the image quality between high-resolution/low-contrast and low-resolution/high-contrast from the same previously recorded spin noise data.

The combination of magnetic resonance with laser spectroscopy provides some interesting options for increasing the sensitivity and information content of magnetic resonance by many orders of magnitude. This review covers the basic physics behind the relevant processes, such as angular momentum conservation during absorption and emission.

We have assembled a few off-the-shelf electronic chips and a popular Arduino Uno microcomputer board into an automatic system that performs so-called tuning and matching of an arbitrary NMR probehead at very low cost. This removes the tedium of doing the job by hand, the bane of many NMR analysts. It also brings accuracy and repeatability into the process, which is so necessary for high throughput analysis, or when working with low-field permanent magnesystems with excessive magnetic field drift.

We have recently demonstrated the capability to rapidly spin spherical rotors inclined precisely at the magic angle (54.74°) with respect to the external magnetic field used for NMR experiments. In this work, we show that it is possible to spin a spherical rotor without using turbine grooves, and that these rotors are extremely stable as a result of their inherent spherical-ring geometry. These results portend the facile implementation of spherical rotors for solid state NMR experiments.

The cosmetic industry integrates in its products active ingredients of vegetal origin. For this purpose, plant extracts are prepared and their content must be characterized to check their conformity with safety regulations. Many plant extracts contain a high proportion of high-boiling point solvents that may conflict with analytical protocols. Extract analysis by fractionation and subsequent ¹³C NMR analysis required a new solvent signal suppression technique to provide better analytical data.