A probehead of an NMR-MAS apparatus with a rotation axis (RA), which lies in an xz-plane, titled by an angle θ>0 relative to a z-axis. The angle θ is adjusted by tilting around a tilt axis (DA) parallel to the y-axis relative to a target angle θ.sub.target. An angle measurement apparatus (9) has a first sensor element (7), which, together with a second sensor element (8) generates sensor signals dependent on the amplitude B0 of the static magnetic field and the vectorial orientation between the magnetic field B0 and a sensitivity vector. Two sensitivity vectors have an angle 5°<αi<175° to the z-axis and an angle β>10° to each other. The angle between the rotation axis and the z-axis can be measured precisely and reliably over a large range, providing a feedback signal for regulated adjustment or tracking of the angle θ.

Provided is a stable isotope-labeled aliphatic amino acid enabling the assignment of the signal of an amino acid residue side chain by increasing to the maximum the observation sensitivity to an NMR signal of the same amino acid residue side chain, and allowing NOE (nuclear Overhauser effect) between protons in the amino acid residue to be observed. The stable isotope-labeled aliphatic amino acid is for constituting a protein and satisfies all of the following conditions (1) to (3): (1) two or more carbon atoms are labeled with .sup.13C; (2) of two or more carbon atoms labeled with .sup.13C, a carbon atom other than a carbon atom of a methyl group, which is capable of bonding to a hydrogen atom, has one .sup.1H directly bonded thereto, while the carbon atom of the methyl group has at least one .sup.1H directly bonded thereto; and (3) other carbon atoms adjacent to all the .sup.13C are all .sup.12C.

A process for the specific isotopic labeling of an amino acid selected from Valine (Val), Leucine (Leu), and Isoleucine (Ile), in proteins and biomolecular assemblies by introducing, in a medium containing bacteria overexpressing a protein, an acetolactate derivative of Formula I of the application.

A mobile measuring device, in particular a hand-held measuring device, comprises a housing, in which at least one sensor device, a control device for controlling the sensor device, an evaluation device for evaluating the measurement signals supplied by the sensor device as well as a device for supplying energy to the measuring device are provided. The sensor device comprises at least one nuclear spin resonance sensor which is provided at least for the detection and/or analysis and/or differentiation of a material characteristic of a workpiece, in particular in a workpiece.

A method of generating codes for chemical structures from NMR spectroscopy data comprises receiving spectroscopic data of a chemical compound, inputting the spectroscopic data into a first artificial neural network to generate molecular descriptors, receiving a molecular descriptor from the first artificial neural network, inputting the molecular descriptor a second artificial neural network to convert structure data of the chemical reference compounds to molecular descriptors and to convert the molecular descriptors back to the structure data, and receiving structure data of the chemical compound from the second artificial neural network.

A data generating method includes: an atomic model generating step of generating one or more three-dimensional atomic models corresponding to a nanomaterial to be measured; a three-dimensional data generating step of generating three-dimensional atomic level structure volume data corresponding to the nanomaterial to be measured based on the one or more three-dimensional atomic model; a tilt series generating step of generating a tilt series by simulating three-dimensional tomography for a plurality of different angles in a predetermined angle range for at least some of the three-dimensional atomic level structure volume data; and a three-dimensional atomic structure tomogram volume data generating step of generating a three-dimensional atomic structure tomogram volume data set by performing three-dimensional reconstruction on at least some of the three-dimensional atomic level structure volume data based on the tilt series.

A method, in accordance with an embodiment of the present invention, for testing for mastitis in a domestic animal includes the step of measuring, by nuclear magnetic resonance (NMR), a spin-spin relaxation time of milk collected from a quarter of the domestic animal.

The present invention discloses a method for selectively detecting dopamine based on magnetic resonance nuclear spin singlet state. The method uses the nuclear spin singlet of three hydrogen atoms on the dopamine benzene ring to achieve selective detection of dopamine signals in a complicated system. The present invention is based on magnetic resonance technology to detect dopamine, has good accuracy, sensitivity and selectivity, can accurately detect the signal of dopamine from the complicated system, and the interference of signals of other substances are well eliminated. Meanwhile, the present invention further has the advantages of simple operation and non-intervention, can be used for monitoring the content and distribution of the dopamine in a living body, and has important application value in the fields of biology and medicine.

The present invention relates to a method based on proton NMR technique to differentiate genuine and spurious Hand-rub formulations. This method identifies and estimates all four components present in WHO-recommended Hand-rub formulations. Further, this method also identifies the presence of non-recommended/additional components present in WHO-recommended Hand-rub formulations. The method described in this invention utilizes experimental parameters and derived equations to quantify all four components in just fifteen minutes without using any organic solvents.

The present invention relates to a method based on proton NMR technique to differentiate genuine and spurious Hand-rub formulations. This method identifies and estimates all four components present in WHO-recommended Hand-rub formulations. Further, this method also identifies the presence of non-recommended/additional components present in WHO-recommended Hand-rub formulations. The method described in this invention utilizes experimental parameters and derived equations to quantify all four components in just fifteen minutes without using any organic solvents.