Mon premier blog

Principles of Nuclear Magnetic Resonance Microscopy Paul Callaghan
Publisher: Oxford University Press, USA

So why does NMR get such a bad rap? MRI is based on the principles of nuclear magnetic resonance (NMR), which is a spectroscopic technique used to obtain microscopic chemical and physical data about molecules. As a structural tool, it always seems to play second fiddle to crystallography, and not many people seem to know about all of the different types of information that NMR can give you. The basic However, existing techniques either have poor spatial resolution compared to optical microscopy and are hence not generally applicable to imaging of sub-cellular structure (for example, magnetic resonance imaging), or entail operating conditions that preclude . Applications such as nuclear magnetic resonance spectroscopy, compass mechanisms of birds and rodents are based on different physical principles. An NMR technique tracks the diffusion of water molecules to obtain micron-scale structural information about a porous material. Researchers increase NMR/MRI sensitivity through hyperpolarization of nuclei in diamond. The general principles of the magnetic imaging technique used here have been known for some time. Rainer Kimmich, NMR Tomography, and Diffusometry, Relaxometry (Springer-Verlag, Berlin, 1997)[Amazon][WorldCat]. Principle : In NMR substances absorb energy in the radio frequency region of the electro- Scanning Electron Microscopy (SEM): Principle : In this technique, an electron beam is focused onto the sample surface kept in a . (1994) Principles of Nuclear Magnetic Resonance Microscopy, Oxford University Press. Callaghan, Principles of Nuclear Magnetic Resonance Microscopy (Clarendon Press, Oxford, 1993)[ Amazon][WorldCat].