| Popis: |
Publisher Summary This chapter describes various aspects of Nuclear Magnetic Resonance (NMR). NMR spectroscopy has proven to be a most powerful tool for unraveling the fine details of molecular structure and interactions in solution. NMR is a spectroscopic method, which permits one to monitor the transitions between the various spin states in a magnetic field. For an isolated spin, quantum mechanics allows only transitions between adjacent levels. It is noted that the dipolar relaxation rate is be highly dependent upon the gyromagnetic ratios of the interacting nuclei. It is found that in addition to the direct dipolar coupling of nuclear magnetic moments, there can also be indirect interactions between nuclei, which are mediated via the bonding electrons. This effect is called spin–spin or scalar coupling and can lead to fine structure in the resonance signals. A number of NMR techniques have also been applied to probe the orientational order and the molecular mobility of the phospholipid molecules in bilayers. |
